JP2020105238A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

To provide a liquid crystal composition excellent in storage stability, aligning property and dropping mark suppressing property, and a liquid crystal display element using the liquid crystal composition.SOLUTION: The liquid crystal composition of the present invention comprises a liquid crystal mixture containing a plurality of types of liquid crystal molecules, and an alignment assistant having at least one adsorptive group and inducing spontaneous alignment of the liquid crystal molecules, in which a difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment assistant is 17 or less. The difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment assistant is preferably more than 2.SELECTED DRAWING: None

Description

The present invention relates to a liquid crystal composition and a liquid crystal display device.

Conventionally, in a VA type liquid crystal display device, a polyimide (PI) film that functions as an alignment film on an electrode in order to induce vertical alignment of liquid crystal molecules when no voltage is applied and realize horizontal alignment of liquid crystal molecules when voltage is applied. Is provided. However, since the film formation of the PI film requires a great deal of cost, in recent years, a method for realizing the alignment of liquid crystal molecules while omitting the PI film has been studied (for example, see Patent Document 1). ).
This patent document 1 discloses a liquid crystal medium which is based on a mixture of polar compounds having a negative dielectric anisotropy and which contains a spontaneously orienting additive having a hydroxyl group. Further, Patent Document 1 describes that this liquid crystal medium can be preferably used in a liquid crystal display element that does not include an alignment film.
From the viewpoint of sufficiently aligning the liquid crystal molecules, it is preferable to increase the amount of the spontaneous alignment additive (alignment aid) contained in the liquid crystal medium (liquid crystal composition). However, depending on the combination of the liquid crystal molecules and the spontaneous alignment additive, there is a problem that crystals of the spontaneous alignment additive tend to precipitate during storage of the liquid crystal medium.

On the other hand, as the applications of liquid crystal display elements have expanded, there have been significant changes in their usage and manufacturing methods. It has become necessary to optimize the characteristics. That is, VA (vertical alignment) type, IPS (in-plane switching) type, and the like are widely used as liquid crystal display elements using the liquid crystal composition, and the size thereof is an ultra-large size display element of 50 type or more. Has been put to practical use and has come to be used.
With the increase in substrate size, the liquid crystal composition is injected into the substrate from a conventional vacuum injection method to a drop injection (ODF: One Drop Fill) method (see Patent Document 2). There is a problem that a drop mark when the liquid crystal is dropped on the substrate causes deterioration of display quality. Here, the drop mark is defined as a phenomenon in which the drop mark of the liquid crystal composition appears white when black is displayed. In particular, when a liquid crystal medium containing a spontaneous alignment additive is dropped, it is difficult to uniformly adsorb the spontaneous alignment additive on the substrate surface, and a liquid crystal medium that simultaneously satisfies good liquid crystal alignment and suppression of drop marks. It was wanted.

Special table 2014-524951 gazette JP, 6-235925, A

An object of the present invention is to provide a liquid crystal composition which is excellent in storage stability, orientation and suppression of dropping marks, and a liquid crystal display device using the liquid crystal composition.

Such an object is achieved by the present invention of the following (1) to (15).
(1) A liquid crystal composition comprising a liquid crystal mixture containing a plurality of types of liquid crystal molecules, and an alignment aid having at least one adsorptive group and spontaneously aligning the liquid crystal molecules,
A liquid crystal composition, wherein the difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment aid is 17 or less.
(2) The liquid crystal composition according to (1), wherein the difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment aid is more than 2.
(3) The liquid crystal composition according to (1) or (2) above, wherein the adsorption group is selected from a cyclic group containing an oxygen atom and a chain group containing an oxygen atom.
(4) The liquid crystal composition according to any one of the above (1) to (3), wherein the alignment aid is a polymer having at least one polymerizable group.

（式中、Ｒ^ＡＰ１及びＲ^ＡＰ２は、それぞれ独立して、水素原子、炭素原子数１〜５のアルキル基又は炭素原子数１〜１０のハロゲン化アルキル基を表し［該アルキル基中の１個又は２個以上の−ＣＨ_２−は、酸素原子が直接隣接しないように−Ｏ−又は−ＣＯ−で置換されてもよく、前記アルキル基中の１個又は２個以上の水素原子は、それぞれ独立して、ハロゲン原子又は水酸基で置換されてもよい。］、
Ｗ^ＡＰ１は、単結合、−Ｏ−、−ＣＯＯ−、−ＯＣＯ−又は−ＣＨ_２−を表し、
ｔ^ＡＰ１は、０、１又は２を表し、
＊は、結合手を表す。） (5) The liquid crystal composition according to (4), wherein the polymerizable group is selected from the group represented by the following general formulas (AP-1) to (AP-9).

(In the formula, R ^AP1 and R ^AP2 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 10 carbon atoms [one in the alkyl group. or two or more -CH 2 _- may be an oxygen atom is substituted with a -O- or -CO- not directly adjacent, one or more hydrogen atoms in the alkyl group, respectively Independently, it may be substituted with a halogen atom or a hydroxyl group.],
W ^AP1 represents a single bond, —O—, —COO—, —OCO— or —CH ₂ —,
t ^AP1 represents 0, 1 or 2,
* Represents a bond. )

（式中、Ｒ^ＡＫ１は、直鎖状若しくは分岐状の炭素原子数１〜２０のアルキル基を表す［該アルキル基中の１個又は隣接しない２個以上の−ＣＨ_２−は、それぞれ独立して、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−Ｏ−、−ＣＯ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよく、前記アルキル基中の１個又は２個以上の水素原子は、それぞれ独立して、ハロゲノ基で置換されてもよい。］。） (6) The alignment aid contains a mesogenic group,
The liquid crystal composition according to any one of (1) to (5) above, wherein the adsorptive group or the polymerizable group is bonded to the mesogen group directly or through a spacer group.
(7) The liquid crystal composition according to (6), wherein the alignment aid includes an alignment-inducing group having a function of binding to the opposite side of the mesogen group from the adsorption group and inducing the alignment of the liquid crystal molecules.
(8) The liquid crystal composition according to the above (7), wherein the alignment-inducing group is represented by the following general formula (AK).

(In the formula, R ^AK1 represents a linear or branched alkyl group having 1 to 20 carbon atoms. [One or two or more non-adjacent —CH ₂ — in the alkyl group are each independently And may be substituted with -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and one or more hydrogen atoms in the alkyl group May each independently be substituted with a halogeno group.].)

（式中、Ｚ^ＡＬ１は、単結合、−ＣＨ＝ＣＨ−、−ＣＦ＝ＣＦ−、−Ｃ≡Ｃ−、−ＣＯＯ−、−ＯＣＯ−、−ＯＣＯＯ−、−ＣＦ_２Ｏ−、−ＯＣＦ_２−、−ＣＨ＝ＣＨＣＯＯ−、−ＯＣＯＣＨ＝ＣＨ−、−ＣＨ_２−ＣＨ_２ＣＯＯ−、−ＯＣＯＣＨ_２−ＣＨ_２−、−ＣＨ＝Ｃ（ＣＨ_３）ＣＯＯ−、−ＯＣＯＣ（ＣＨ_３）＝ＣＨ−、−ＣＨ_２−ＣＨ（ＣＨ_３）ＣＯＯ−、−ＯＣＯＣＨ（ＣＨ_３）−ＣＨ_２−、−ＯＣＨ_２ＣＨ_２Ｏ−又は炭素原子数１〜２０のアルキレン基を表す［該アルキレン基中の１個又は２個以上の−ＣＨ_２−は、酸素原子が直接隣接しないように−Ｏ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよい。］、
Ａ^ＡＬ１及びＡ^ＡＬ２は、それぞれ独立して、２価の環式基を表し、
Ｚ^ＡＬ１、Ａ^ＡＬ１及びＡ^ＡＬ２中の１個又は２個以上の水素原子は、それぞれ独立して、ハロゲノ基、前記吸着基、Ｐ^ＡＰ１−Ｓｐ^ＡＰ１−又は１価の有機基で置換されてもよく［Ｐ^ＡＰ１は前記重合性基を表し、Ｓｐ^ＡＰ１は、単結合又は前記スペーサ基を表す。］、
分子内にＺ^ＡＬ１及びＡ^ＡＬ１が複数存在する場合に、それぞれ互いに同一であっても異なってもよく、
ｍ^ＡＬ１は、１〜５の整数を表す。） (9) The spacer group is an alkylene group having 1 to 30 carbon atoms (provided that —CH ₂ — in the alkylene group is —O—, —CO—, —COO— so that oxygen atoms are not directly adjacent to each other. , —OCO—, —CH═CH— or —C≡C—, and the hydrogen atom in the alkylene group may be substituted with a halogen atom.) (6) to (). The liquid crystal composition according to any one of 8).
(10) The liquid crystal composition according to any one of (6) to (9), in which the mesogen group is represented by the following general formula (AL).

^{(Wherein, Z AL1} is a single bond, -CH = CH -, - CF = CF -, - C≡C -, - COO -, - OCO -, - OCOO -, - CF 2 O -, - OCF 2 _{-, - CH = CHCOO -,} - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH _{-, - CH 2 -CH (CH} 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH represents a 2 _CH 2 O- or alkylene group having 1 to 20 carbon atoms [in the alkylene radical one or more -CH ₂ - may, -O so that oxygen atoms are not directly adjacent -, - COO- or may be substituted with -OCO-],.
A ^AL1 and A ^AL2 each independently represent a divalent cyclic group,
One or more hydrogen atoms in Z ^AL1 , A ^AL1 and A ^AL2 may be independently substituted with a halogeno group, the adsorbing group, P ^AP1- Sp ^AP1 -or a monovalent organic group. Well [P ^AP1 represents the polymerizable group, and Sp ^AP1 represents a single bond or the spacer group. ],
When a plurality of Z ^AL1 and A ^AL1 are present in the molecule, they may be the same or different from each other,
m ^AL1 represents an integer of 1 to 5. )

（式（Ｐ）中、Ｒ^ｐ１は、水素原子、フッ素原子、シアノ基、炭素原子数１〜１５のアルキル基又は−Ｓｐ^ｐ２−Ｐ^ｐ２を表し［前記アルキル基中に存在する１個又は隣接しない２個以上の−ＣＨ_２−は、それぞれ独立して、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−Ｏ−、−ＣＯ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよく、前記アルキル基中に存在する１個又は２個以上の水素原子は、それぞれ独立して、シアノ基、フッ素原子又は塩素原子で置換されてもよい。］、
Ｐ^ｐ１及びＰ^ｐ２は、それぞれ独立して、下記一般式（Ｐ^ｐ１−１）〜式（Ｐ^ｐ１−９）のいずれかを表し、

［式中、Ｒ^ｐ１１及びＲ^ｐ１２は、それぞれ独立して、水素原子、炭素原子数１〜５のアルキル基又は炭素原子数１〜５のハロゲン化アルキル基を表し、Ｗ^ｐ１１は、単結合、−Ｏ−、−ＣＯＯ−、−ＯＣＯ−、又は−ＣＨ_２−を表し、ｔ^ｐ１１は、０、１又は２を表すが、分子内にＲ^ｐ１１、Ｒ^ｐ１２、Ｗ^ｐ１１及び／又はｔ^ｐ１１が複数存在する場合、それらは同一であっても異なってもよく、＊は、結合手を表す。］
Ｓｐ^ｐ１及びＳｐ^ｐ２は、それぞれ独立して、単結合又は前記スペーサ基を表し、
Ｚ^ｐ１及びＺ^ｐ２は、それぞれ独立して、単結合、−Ｏ−、−Ｓ−、−ＣＨ_２−、−ＯＣＨ_２−、−ＣＨ_２Ｏ−、−ＣＯ−、−Ｃ_２Ｈ_４−、−ＣＯＯ−、−ＯＣＯ−、−ＯＣＯＯＣＨ_２−、−ＣＨ_２ＯＣＯＯ−、−ＯＣＨ_２ＣＨ_２Ｏ−、−ＣＯ−ＮＲ^ＺＰ１−、−ＮＲ^ＺＰ１−ＣＯ−、−ＳＣＨ_２−、−ＣＨ_２Ｓ−、−ＣＨ＝ＣＲ^ＺＰ１−ＣＯＯ−、−ＣＨ＝ＣＲ^ＺＰ１−ＯＣＯ−、−ＣＯＯ−ＣＲ^ＺＰ１＝ＣＨ−、−ＯＣＯ−ＣＲ^ＺＰ１＝ＣＨ−、−ＣＯＯ−ＣＲ^ＺＰ１＝ＣＨ−ＣＯＯ−、−ＣＯＯ−ＣＲ^ＺＰ１＝ＣＨ−ＯＣＯ−、−ＯＣＯ−ＣＲ^ＺＰ１＝ＣＨ−ＣＯＯ−、−ＯＣＯ−ＣＲ^ＺＰ１＝ＣＨ−ＯＣＯ−、−（ＣＨ_２）_２−ＣＯＯ−、−（ＣＨ_２）_２−ＯＣＯ−、−ＯＣＯ−（ＣＨ_２）_２−、−（Ｃ＝Ｏ）−Ｏ−（ＣＨ_２）_２−、−ＣＨ＝ＣＨ−、−ＣＦ＝ＣＦ−、−ＣＦ＝ＣＨ−、−ＣＨ＝ＣＦ−、−ＣＦ_２−、−ＣＦ_２Ｏ−、−ＯＣＦ_２−、−ＣＦ_２ＣＨ_２−、−ＣＨ_２ＣＦ_２−、−ＣＦ_２ＣＦ_２−又は−Ｃ≡Ｃ−を表し［式中、Ｒ^ＺＰ１は、それぞれ独立して、水素原子又は炭素原子数１〜４のアルキル基を表すが、分子内にＲ^ＺＰ１が複数存在する場合、それらは同一であっても異なってもよい。］、
Ａ^ｐ１、Ａ^ｐ２及びＡ^ｐ３は、それぞれ独立して、
（ａ^ｐ） １，４−シクロヘキシレン基［この基中に存在する１個の−ＣＨ_２−又は隣接していない２個以上の−ＣＨ_２−は、−Ｏ−で置換されてもよい。］
（ｂ^ｐ） １，４−フェニレン基［この基中に存在する１個の−ＣＨ＝又は隣接していない２個以上の−ＣＨ＝は、−Ｎ＝で置換されてもよい。］及び
（ｃ^ｐ） ナフタレン−２，６−ジイル基、ナフタレン−１，４−ジイル基、ナフタレン−１，５−ジイル基、１，２，３，４−テトラヒドロナフタレン−２，６−ジイル基、デカヒドロナフタレン−２，６−ジイル基、フェナントレン−２，７−ジイル基又はアントラセン−２，６−ジイル基［これらの基中に存在する１個の−ＣＨ＝又は隣接していない２個以上の−ＣＨ＝は、−Ｎ＝で置換されてもよい。］
からなる群より選ばれる基［前記基（ａ^ｐ）、基（ｂ^ｐ）及び基（ｃ^ｐ）は、それぞれ独立して、この基中に存在する水素原子が、ハロゲン原子、炭素原子数１〜８のアルキル基又は炭素原子数１〜８のアルケニル基、シアノ基又は−Ｓｐ^ｐ２−Ｐ^ｐ２で置換されてもよい。］を表し、
ｍ^ｐ１は、０、１、２又は３を表し、
分子内にＺ^ｐ１、Ａ^ｐ２、Ｓｐ^ｐ２及び／又はＰ^ｐ２が複数存在する場合、それらは同一であっても異なってもよいが、ｍ^ｐ１が０で、Ａ^ｐ１が前記基（ｃ^ｐ）である場合、Ａ^ｐ３は単結合であってもよい。） (11) The liquid crystal composition according to any one of the above (1) to (10), which further contains a polymerizable compound represented by the following general formula (P).

(In the formula (P), R ^p1 represents a hydrogen atom, a fluorine atom, a cyano group, an alkyl group having 1 to 15 carbon atoms or —Sp ^p2 —P ^p2 [one present in the alkyl group or adjacent to the same. Two or more —CH ₂ — which may not be independently substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—, One or more hydrogen atoms present in the alkyl group may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom.],
P ^p1 and P ^p2 each independently represent one of the following general formula (P ^p1-1 ) to formula (P ^p1 -9),

[In the formula, R ^p11 and R ^p12 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 5 carbon atoms, and W ^p11 is a single bond, -O -, - COO -, - OCO-, or -CH ₂ - ^{represents, t pi 1} may represent 0, 1, or ^{2, R p11, R p12,} W p11 and / or ^{t pi 1} in the molecule When two or more are present, they may be the same or different, and * represents a bond. ]
Sp ^p1 and Sp ^p2 each independently represent a single bond or the spacer group,
Z ^p1 and Z ^p2 are each independently a single bond, —O—, —S—, —CH ₂ —, —OCH ₂ —, —CH ₂ O—, —CO—, —C ₂ H ₄ —, _{-COO -, - OCO -, -} OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR ZP1 -, - NR ZP1 -CO -, - SCH 2 -, - CH 2 S ^{-, - CH = CR ZP1 -COO} -, - CH = CR ZP1 -OCO -, - COO-CR ZP1 = CH -, - OCO-CR ZP1 = CH -, - COO-CR ZP1 = CH-COO -, - ^{COO-CR ZP1 = CH-OCO} -, - OCO-CR ZP1 = CH-COO -, - OCO-CR ZP1 = CH-OCO -, - (CH 2) 2 -COO -, - (CH 2) 2 -OCO _{-, - OCO- (CH 2)} 2 -, - (C = O) -O- (CH 2) 2 -, - CH = CH -, - CF = CF -, - CF = CH -, - CH = CF _{-, - CF 2 -, -} CF 2 O -, - OCF 2 -, - CF 2 CH 2 -, - CH 2 CF 2 -, - CF 2 CF 2 - or an -C≡C- [wherein, R ^{ZP1 s} each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, but when a plurality of R ^{ZP1 s} are present in the molecule, they may be the same or different. ],
A ^p1 , A ^p2 and A ^p3 are each independently,
(A ^p )1,4-cyclohexylene group [One —CH ₂ — present in this group or two or more —CH ₂ — which are not adjacent to each other may be substituted with —O—. ]
^(B p) 1,4-phenylene group [this one which is present in the group -CH = or non-adjacent two or more -CH = may be replaced by -N =. ] And ^(c p) naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, naphthalene-1,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group , Decahydronaphthalene-2,6-diyl group, phenanthrene-2,7-diyl group or anthracene-2,6-diyl group [one -CH= present in these groups or two non-adjacent groups] The above -CH= may be replaced with -N=. ]
Group [wherein the group selected from the group consisting of (a ^p), group (b ^p) and group (c ^p) are each independently hydrogen atoms present in this group, a halogen atom, carbon atom 1 It may be substituted with an alkyl group having 8 to 8 or an alkenyl group having 1 to 8 carbon atoms, a cyano group, or -Sp ^p2- P ^p2 . ],
m ^p1 represents 0, 1, 2 or 3,
^{If Z p1,} A ^{p2, Sp} p2 and / or ^{P p2} is more present in the molecule, they may be the same or ^different, but ^{m p1} is ^{0, A p1} is the group ^(c p) When A ^p3 may be a single bond. )

(12) A liquid crystal comprising two substrates and a liquid crystal layer provided between the two substrates and containing the liquid crystal composition according to any one of the above (1) to (11). Display element.
(13) The liquid crystal display device according to (12), wherein the liquid crystal layer contains a polymer of the alignment aid.
(14) The liquid crystal display device according to the above (12) or (13), which is a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type.
(15) The liquid crystal display element according to any one of the above (12) to (14), wherein at least one of the two substrates has no alignment film.

ADVANTAGE OF THE INVENTION According to this invention, the storage stability is excellent, the good alignment of a liquid crystal molecule is possible, the alignment aid which can maintain the obtained alignment and tilt stably, the liquid crystal composition containing this alignment aid, A liquid crystal display device can be provided.

FIG. 1 is an exploded perspective view schematically showing an embodiment of a liquid crystal display element. It is the top view which expanded the area|region enclosed by the I line in FIG.

Hereinafter, the alignment aid, the liquid crystal composition and the liquid crystal display device of the present invention will be described in detail based on preferred embodiments.
(Liquid crystal composition)
The liquid crystal composition of the present invention is used for forming a liquid crystal layer included in a liquid crystal display element. This liquid crystal composition contains liquid crystal molecules having a negative dielectric anisotropy (Δε), and an alignment aid (alignment aid of the present invention) having a function of spontaneously aligning the liquid crystal molecules. ..
((Alignment aid))
The alignment aid is a member (electrode (for example, ITO), substrate (for example, glass substrate, acrylic substrate, transparent substrate, flexible substrate, or the like)) that directly contacts the liquid crystal layer containing the liquid crystal composition, resin layer (for example, color filter). , An alignment film, an overcoat layer, etc.) and an insulating film (for example, an inorganic material film, SiNx, etc.) and induce a homeotropic alignment of liquid crystal molecules contained in the liquid crystal layer.

The alignment aid induces alignment of the liquid crystal molecules, a polymerizable group for polymerization, a mesogen group similar to the liquid crystal molecules, an adsorption group (polar group) capable of interacting with a member that directly contacts the liquid crystal layer. It preferably has an orientation-inducing group.
It is preferable that the adsorption group and the orientation-inducing group are bound to the mesogen group, and the polymerizable group is substituted on the mesogen group, the adsorption group and the orientation-inducing group directly or via a spacer group as necessary. In particular, the polymerizable group is preferably substituted with a mesogenic group in a state of being incorporated in the adsorptive group.
Hereinafter, * at the left end and * at the right end in the chemical formulas represent a bond.

式中、Ｒ^ＡＫ１は、直鎖状若しくは分岐状の炭素原子数１〜２０のアルキル基を表す。ただし、アルキル基中の１個又は隣接しない２個以上の−ＣＨ_２−は、それぞれ独立して、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−Ｏ−、−ＣＯ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよく、アルキル基中の１個又は２個以上の水素原子は、それぞれ独立して、ハロゲノ基で置換されてもよい。 "Orientation-inducing group"
The orientation-inducing group has a function of inducing the orientation of liquid crystal molecules, and is preferably a group represented by the following general formula (AK).

In the formula, R ^AK1 represents a linear or branched alkyl group having 1 to 20 carbon atoms. However, one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, —C≡C—, —O—, —CO—, —COO— or It may be substituted with —OCO—, and one or more hydrogen atoms in the alkyl group may be independently substituted with a halogeno group.

R ^AK1 preferably represents a linear or branched alkyl group having 1 to 20 carbon atoms, more preferably a linear alkyl group having 1 to 20 carbon atoms, and linear. It is more preferable to represent an alkyl group having 1 to 8 carbon atoms.
Further, one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, —C≡C—, —O—, —CO—, —COO— or It may be substituted with -OCO-.
Further, the hydrogen atom in the alkyl group may be substituted with a fluorine atom or a chlorine atom, or may be substituted with a fluorine atom.
From the viewpoint of imparting so-called amphipathicity to the orientation aid, the orientation-inducing group is preferably bonded to the side opposite to the adsorption group of the mesogenic group.

"Polymerizable group"
The polymerizable group is represented by P ^AP1 − and is preferably bonded to the mesogen group via —Sp ^AP1 — (single bond or spacer group).
P ^AP1 is preferably a group selected from the group represented by the following general formulas (AP-1) to (AP-9).

In the formula, R ^AP1 and R ^AP2 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a halogenated alkyl group having 1 to 10 carbon atoms. However, one or more -CH 2 in the alkyl group _- may have an oxygen atom is substituted with a -O- or -CO- not directly adjacent, one in the alkyl group or two The above hydrogen atoms may be independently substituted with a halogen atom or a hydroxyl group.
W ^AP1 represents a single bond, -O -, - COO -, - OCO- or -CH ₂ - represents a.
t ^AP1 represents 0, 1 or 2.

P ^AP1 is preferably a group represented by the following general formula (AP-1) to general formula (AP-7), and is represented by the following general formula (AP-1) or general formula (AP-2). Group represented by formula (AP-1) is more preferable.
Sp ^AP1 preferably represents a single bond or a linear or branched alkylene group having 1 to 20 carbon atoms, and more preferably a single bond or a linear alkylene group having 1 to 20 carbon atoms. It is more preferable to represent a single bond or a linear alkylene group having 2 to 10 carbon atoms.
In Sp ^AP1 , one or two or more —CH ₂ — in the alkylene group are independently —CH═CH—, —C≡C—, —O so that oxygen atoms are not directly adjacent to each other. It may be substituted with -, -CO-, -COO- or -OCO-.

In the orientation aids, P ^{AP1 -Sp} AP1 ^- number of, preferably one or more five or less, more preferably 1 or more is four or less, be two or more and four or less More preferably, 2 or 3 is particularly preferable, and 2 is most preferable.
P ^AP1 -Sp ^AP1 - hydrogen atoms in the polymerizable group, may be substituted with an adsorptive group and / or orientation-induced group.
P ^AP1 -Sp ^AP1 - is a polymerizable group, mesogen group may be bonded to an adsorptive group and / or orientation-induced group.
Also, P ^{AP1 -Sp} AP1 ^- is preferably binding to the mesogenic groups, the adsorption group or orientation-induced group, and more preferably binding to the mesogenic groups or adsorptive groups.
When a plurality of P ^AP1 and/or Sp ^AP1 − are present in the molecule, they may be the same or different from each other.

"Mesogenic group"
The mesogen group means a group having a rigid portion, for example, a group having at least one cyclic group, preferably a group having 2 to 4 cyclic groups, and 3 to 4 cyclic groups. Groups are more preferred. In addition, if necessary, the cyclic group may be linked by a linking group. The mesogen group preferably has a skeleton similar to that of liquid crystal molecules (liquid crystal compound) used in the liquid crystal layer.
In addition, in the present specification, the “cyclic group” refers to an atomic group in which constituent atoms are cyclically bonded, and includes a carbocycle, a heterocycle, a saturated or unsaturated cyclic structure, a monocyclic and bicyclic structure, Includes polycyclic structures, aromatics, non-aromatics and the like.
The cyclic group may contain at least one hetero atom, and may be further substituted with at least one substituent (halogeno group, polymerizable group, organic group (alkyl group, alkoxy group, aryl group, etc.). When the cyclic group is monocyclic, the mesogen group preferably contains two or more monocyclic rings.

式中、Ｚ^ＡＬ１は、単結合、−ＣＨ＝ＣＨ−、−ＣＦ＝ＣＦ−、−Ｃ≡Ｃ−、−ＣＯＯ−、−ＯＣＯ−、−ＯＣＯＯ−、−ＣＦ_２Ｏ−、−ＯＣＦ_２−、−ＣＨ＝ＣＨＣＯＯ−、−ＯＣＯＣＨ＝ＣＨ−、−ＣＨ_２−ＣＨ_２ＣＯＯ−、−ＯＣＯＣＨ_２−ＣＨ_２−、−ＣＨ＝Ｃ（ＣＨ_３）ＣＯＯ−、−ＯＣＯＣ（ＣＨ_３）＝ＣＨ−、−ＣＨ_２−ＣＨ（ＣＨ_３）ＣＯＯ−、−ＯＣＯＣＨ（ＣＨ_３）−ＣＨ_２−、−ＯＣＨ_２ＣＨ_２Ｏ−又は炭素原子数１〜２０のアルキレン基を表す。ただし、アルキレン基中の１個又は２個以上の−ＣＨ_２−は、酸素原子が直接隣接しないように−Ｏ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよい。 The mesogen group is preferably represented by, for example, general formula (AL).

In the formula, Z ^AL1 is a single bond, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —CF ₂ O—, —OCF ₂ —. _{, -CH = CHCOO -, - OCOCH} = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH- _{, -CH 2 -CH (CH 3)} COO -, - OCOCH (CH 3) -CH 2 -, - represents an alkylene group of OCH 2 _CH 2 O- or 1 to 20 carbon atoms. However, one or more —CH ₂ — in the alkylene group may be substituted with —O—, —COO— or —OCO— so that oxygen atoms are not directly adjacent to each other.

A ^AL1 and A ^AL2 each independently represent a divalent cyclic group.
One or more hydrogen atoms in Z ^AL1 , A ^AL1 and A ^AL2 may be independently substituted with a halogeno group, an adsorbing group, P ^AP1- Sp ^AP1 -or a monovalent organic group. ,
When a plurality of Z ^AL1 and A ^AL1 are present in the molecule, they may be the same or different from each other.
m ^AL1 represents an integer of 1 to 5.
In general formula (AL), Z ^AL1 is preferably a single bond or an alkylene group having 2 to 20 carbon atoms, more preferably a single bond or an alkylene group having 2 to 10 carbon atoms, and a single bond. , - _{(CH 2) 2} - or - _{(CH 2) 4} - and still more preferably a. One or more -CH ₂ in the alkylene group - is, -O so that oxygen atoms are not directly adjacent -, - COO- or may be substituted with -OCO-.
Furthermore, when it is intended to increase the linearity of a rod-shaped molecule, Z ^AL1 is a single bond in which rings are directly connected to each other, or an even number of atoms directly connecting the rings is even. The form is preferred. For example, in the case of —CH ₂ —CH ₂ COO—, the number of atoms that directly connect the rings is four.

In formula (AL), A ^AL1 and A ^AL2 each independently represent a divalent cyclic group. As the divalent cyclic group, 1,4-phenylene group, 1,4-cyclohexylene group, 1,4-cyclohexenyl group, tetrahydropyran-2,5-diyl group, 1,3-dioxane-2, 5-diyl group, tetrahydrothiopyran-2,5-diyl group, thiophene-2,5-diyl group, 1,4-bicyclo(2.2.2)octylene group, decahydronaphthalene-2,6-diyl group , Pyridine-2,5-diyl group, pyrimidine-2,5-diyl group, pyrazine-2,5-diyl group, thiophene-2,5-diyl group-, 1,2,3,4-tetrahydronaphthalene-2 , 6-diyl group, 2,6-naphthylene group, phenanthrene-2,7-diyl group, 9,10-dihydrophenanthrene-2,7-diyl group, 1,2,3,4,4a,9,10a- Octahydrophenanthrene-2,7-diyl group, 1,4-naphthylene group, benzo[1,2-b:4,5-b']dithiophene-2,6-diyl group, benzo[1,2-b: 4,5-b']diselenophen-2,6-diyl group, [1]benzothieno[3,2-b]thiophene-2,7-diyl group, [1]benzoselenopheno[3,2-b]selenophene It is preferably one kind selected from the group consisting of -2,7-diyl group and fluorene-2,7-diyl group, and is 1,4-phenylene group, 1,4-cyclohexylene group, 2,6- A naphthylene group or a phenanthrene-2,7-diyl group is more preferable, and a 1,4-phenylene group or a 1,4-cyclohexylene group is further preferable.
In addition, these groups may be unsubstituted or substituted with a substituent. The substituent is preferably a fluorine atom or an alkyl group having 1 to 8 carbon atoms. Further, the alkyl group may be substituted with a fluorine atom or a hydroxyl group.
Further, one or more hydrogen atoms in the cyclic group may be substituted with a halogeno group, an adsorption group, P ^AP1- Sp ^AP1 -or a monovalent organic group.

In the general formula (AL), the monovalent organic group is a group having a chemical structure formed by the organic compound being in the form of a monovalent group, and is formed by removing one hydrogen atom from the organic compound. An atomic group.
Examples of the monovalent organic group include an alkyl group having 1 to 15 carbon atoms, an alkenyl group having 2 to 15 carbon atoms, an alkoxy group having 1 to 14 carbon atoms, and an alkenyloxy having 2 to 15 carbon atoms. Groups, etc., preferably an alkyl group having 1 to 15 carbon atoms or an alkoxy group having 1 to 14 carbon atoms, and an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms. Is more preferable, and an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms is more preferable, and an alkyl group having 1 to 3 carbon atoms or 1 to 2 carbon atoms. An alkoxy group is particularly preferable, and an alkyl group having 1 or 2 carbon atoms or an alkoxy group having 1 carbon atom is most preferable.
Further, the alkyl group, alkenyl group, alkoxy group, one or two or more -CH ₂ in the alkenyloxy groups - is, as the oxygen atoms are not directly adjacent -O -, - COO- or -OCO- in It may be replaced. Furthermore, the monovalent organic group may have a role as the above-mentioned orientation-inducing group.
In the general formula (AL), m ^AL1 is preferably an integer of 1 to 4, more preferably an integer of 1 to 3, and even more preferably 2 or 3.

Preferred forms of the mesogen group include the following formulas (me-1) to (me-44).

The general formula (AL) is a structure in which two hydrogen atoms are eliminated from these compounds.
In these formulas (me-1) to (me-44), one or two or more hydrogen atoms in the cyclohexane ring, benzene ring or naphthalene ring are each independently a halogeno group, P ^AP1 -Sp ^AP1. -It may be substituted with a monovalent organic group (for example, an alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 14 carbon atoms), an adsorption group or an orientation inducing group.
Among the above mesogen groups, preferred forms are formulas (me-8) to (me-44), and more preferred forms are formulas (me-8) to (me-10) and formulas (me-12) to (me-12). (Me-18), formulas (me-22) to (me-24), formulas (me-26) to (me-27) and formulas (me-29) to (me-44), and more preferable forms. Is a formula (me-12), (me-14), (me-16), (me-22) to (me-24), (me-29), (me-34), (me-36). ~ (Me-37), (me-42) to (me-44).

Among the above mesogen groups, a particularly preferable form is the following general formula (AL-1) or (AL-2), and a most preferable form is the following general formula (AL-1).

In the formula, X ^{AL101 to} X ^AL118 and X ^{AL201 to} X ^AL214 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a halogeno group, P ^AP1 −. Sp ^APl − represents an adsorption group described later or the above-mentioned orientation-inducing group.
Ring ^{A AL11,} Ring ^{A AL12} and ring ^{A AL21} each independently represent a cyclohexane ring or a benzene ring.
Any one or two or more of X ^{AL101 to} X ^AL118 and X ^{AL201 to} X ^AL214 are substituted with an adsorption group described below.
Any one or two or more of X ^{AL101 to} X ^AL118 and X ^{AL201 to} X ^AL214 are substituted with the orientation-inducing group.
Adsorptive group and the orientation induced group will be described ^later, P ^{AP1 -Sp} AP1 - may be substituted with.
Formula (AL-1) or general formula (AL-2) is, ^P AP1 ^{-Sp APL} in the molecule - with one or two or more.

In formula (AL-1), X ^AL101 is preferably the above-mentioned orientation-inducing group.
In the general formula (AL-1), at least one of X ^AL109 , X ^AL110, and X ^AL111 is preferably an adsorption group described below, and both X ^AL109 and X ^AL110 are adsorption groups described below, or X ^AL110 is described later. Is more preferable, and X ^AL110 is further preferable to be an adsorption group described later.
Is preferably an adsorptive group having or structure in the polymerizable site - in the general formula ^(AL-1), at least one of ^{X AL109,} X ^AL110 and ^{X AL111 P AP1 -Sp} AP1 of the adsorptive group described below , both or one of ^{X AL109} and ^{X AL111} is ^P AP1 ^{-Sp AP1} - is more preferable.
In the general formula (AL-1), one or two of X ^{AL104 to} X ^AL108 and X ^{AL112 to} X ^AL116 are each independently an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms. Alternatively, it is preferably a halogeno group, and more preferably an alkyl group having 1 to 3 carbon atoms or a fluorine atom. In ^particular, independently ^{X AL105,} X ^AL106 or ^{X AL107} respectively, is preferably an alkyl group or a fluorine atom having 1 to 3 carbon atoms.

In formula (AL-2), X ^AL201 is preferably the above-mentioned orientation-inducing group.
In the general formula (AL-2), at least one of X ^AL207 , X ^AL208, and X ^AL209 is preferably an adsorption group described below, and both X ^AL207 and X ^AL208 are adsorption groups described below, or X ^AL208 is described later. Is more preferable, and X ^AL208 is further preferable to be an adsorption group described later.
Is preferably an adsorptive group having or structure in the polymerizable site - in the general formula ^(AL-2), at least one of ^{X AL207,} X ^AL208 and ^{X AL209 P AP1 -Sp} AP1 of the adsorptive group described below , both or one of ^{X AL207} and ^{X AL209} is ^P AP1 ^{-Sp AP1} - is more preferable.
In the general formula (AL-2), one or two of X ^{AL202 to} X ^AL206 and X ^{AL210 to} X ^AL214 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms. Alternatively, it is preferably a halogeno group, and more preferably an alkyl group having 1 to 3 carbon atoms or a fluorine atom. In ^particular, independently ^{X AL204,} X ^AL205 or ^{X AL206} respectively, is preferably an alkyl group or a fluorine atom having 1 to 3 carbon atoms.

"Adsorption group"
The adsorbing group is a group having a role of adsorbing an adsorbent which is a layer that comes into contact with the liquid crystal composition such as a substrate, a film and an electrode.
Adsorption is generally classified into chemisorption in which a chemical bond (covalent bond, ionic bond, or metal bond) is formed to adsorb between an adsorbent and an adsorbate, and physical adsorption other than chemisorption. In the present specification, the adsorption may be either chemical adsorption or physical adsorption, but physical adsorption is preferable. Therefore, the adsorption group is preferably a group capable of physically adsorbing to the adsorption medium, and more preferably a group capable of binding to the adsorption medium by intermolecular force.
Examples of the form of binding to the adsorbent medium by intermolecular force include a form of interaction such as permanent dipole, permanent quadrupole, dispersive force, charge transfer force or hydrogen bond.
A preferable form of the adsorbing group is a form capable of binding to the adsorbent by hydrogen bonding. In this case, the adsorbing group may serve as either a donor or an acceptor of protons that mediate hydrogen bonding, or both.

The adsorptive group is preferably a group containing a polar element having an atomic group in which a carbon atom and a hetero atom are linked (hereinafter, the “adsorptive group” is also referred to as a “polar group”). In the present specification, the polar element refers to an atomic group in which a carbon atom and a hetero atom are directly linked.
The heteroatom is preferably at least one selected from the group consisting of N, O, S, P, B and Si, and at least one selected from the group consisting of N, O and S. Is more preferable, at least one selected from the group consisting of N and O is more preferable, and O is particularly preferable.
In the orientation aid, the valence of the polar element is not particularly limited, such as monovalent, divalent, and trivalent, and the number of polar elements in the adsorbing group is not particularly limited.
The alignment aid preferably has 1 to 8 adsorption groups in one molecule, more preferably 1 to 4 adsorption groups, and further preferably 1 to 3 adsorption groups.
Incidentally, the adsorption group, excluding a polymerizable group and orientation induced group, a hydrogen atom is ^P AP1 ^{-Sp AP1} in adsorptive group - substituted with structural and ^P AP1 ^{-Sp AP1} - hydrogen atoms in the -OH The structure substituted with is included in the adsorptive group.

The adsorptive group contains one or more polar elements and is roughly classified into a cyclic group type and a chain group type.
The cyclic radical type is a form containing a cyclic group having a cyclic structure containing a polar element in its structure, and the chain radical type is a cyclic group having a cyclic structure containing a polar element in its structure. It is a form that does not include.
The chain group type is a form having a polar element in a linear or branched chain group, and may have a cyclic structure which does not include a polar element in a part thereof.
The cyclic group-type adsorptive group means a form having a structure containing at least one polar element in a cyclic atomic arrangement.
In addition, in this specification, the cyclic group is as described above. Therefore, the cyclic group-type adsorptive group only needs to include a cyclic group containing a polar element, and the entire adsorptive group may be branched or linear.
On the other hand, a chain-type adsorptive group is a structure that does not include a cyclic atomic array containing polar elements in the molecule and contains at least one polar element in a linear atomic array (which may be branched). Means a form having.

In addition, in the present specification, the chain group refers to an atomic group in which the constituent atoms are linearly (may be branched) bonded to each other without including a cyclic atomic array in the structural formula, and are acyclic. Refers to the group. In other words, the chain group means a linear or branched aliphatic group, and may contain either a saturated bond or an unsaturated bond.
Therefore, the chain group includes, for example, an alkyl group, an alkenyl group, an alkoxy group, an ester group, an ether group or a ketone group. The hydrogen atom in these groups is substituted with at least one substituent (reactive functional group (vinyl group, acryl group, methacryl group, etc.), chain organic group (alkyl group, cyano group, etc.)) Good. The chain group may be linear or branched.

The cyclic group-type adsorbing group may be a heteroaromatic group having 3 to 20 carbon atoms (including a condensed ring) or a heteroalicyclic group having 3 to 20 carbon atoms (including a condensed ring). A heteroaromatic group having 3 to 12 carbon atoms (including a condensed ring) or a heteroalicyclic group having 3 to 12 carbon atoms (including a condensed ring) is more preferable, and a 5-membered hetero group. It is more preferably an aromatic group, a 5-membered heteroalicyclic group, a 6-membered heteroaromatic group or a 6-membered heteroalicyclic group. In addition, the hydrogen atom in these ring structures may be substituted by a halogeno group, a linear or branched alkyl group having 1 to 5 carbon atoms, or an alkyloxy group.
The chain group-type adsorptive group is preferably a linear or branched alkyl group having 1 to 20 carbon atoms in which hydrogen atom in the structure or —CH ₂ — is substituted with a polar element. It should be noted that one or two or more non-adjacent —CH ₂ — in the alkyl group are substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—. May be done. In addition, the chain-type adsorptive group preferably contains one or more polar elements at the end thereof.

A hydrogen atom in the adsorptive group may be replaced with a polymerizable group.
Specific examples of the polar element include a polar element containing an oxygen atom (hereinafter referred to as an oxygen-containing polar element), a polar element containing a nitrogen atom (hereinafter referred to as a nitrogen-containing polar element), a polar element containing a phosphorus atom (hereinafter referred to as a phosphorus-containing polar element). Element), a polar element containing a boron atom (hereinafter, boron-containing polar element), a polar element containing a silicon atom (hereinafter, silicon-containing polar element), or a polar element containing a sulfur atom (hereinafter, sulfur-containing polar element). .. From the viewpoint of adsorption ability, the polar element is preferably a nitrogen-containing polar element or an oxygen-containing polar element, and more preferably an oxygen-containing polar element.

As the oxygen-containing polar element, at least one group selected from the group consisting of a hydroxyl group, an alkylol group, an alkoxy group, a formyl group, a carboxyl group, an ether group, a carbonyl group, a carbonate group and an ester group or the group is a carbon atom. It is preferably a group linked to an atom.
As the nitrogen-containing polar element, at least one group selected from the group consisting of a cyano group, a primary amino group, a secondary amino group, a tertiary amino group, a pyridyl group, a carbamoyl group, and a ureido group, or the group having a carbon atom It is preferably a group linked to an atom.
Therefore, as the adsorbing group, a cyclic group having an oxygen-containing polar element (hereinafter, oxygen-containing cyclic group), a cyclic group having a nitrogen-containing polar element (hereinafter, nitrogen-containing cyclic group), an oxygen-containing polar group One or more selected from the group consisting of a chain group having an element (hereinafter, oxygen-containing chain group) and a chain group having a nitrogen-containing polar element (hereinafter, nitrogen-containing chain group) It is preferable to include the group itself or the group.

The oxygen-containing cyclic group preferably contains any of the following groups having an oxygen atom as an ether group in the ring structure.

The oxygen-containing cyclic group preferably contains any of the following groups having an oxygen atom as a carbonyl group, a carbonate group and an ester group in the ring structure.

The nitrogen-containing cyclic group preferably contains any of the following groups.

The oxygen-containing chain group preferably contains any of the following groups.

In the formula, R ^at1 represents an alkyl group having 1 to 5 carbon atoms.
Z ^at1 represents a single bond, a linear or branched alkylene group having 1 to 15 carbon atoms, or a linear or branched alkenylene group having 2 to 18 carbon atoms. However, —CH ₂ — in the alkylene group or alkenylene group may be substituted with —O—, —COO—, —C(═O)—, or —OCO— so that oxygen atoms are not directly adjacent to each other.
^Xat1 represents a hydrogen atom or an alkyl group having 1 to 15 carbon atoms. However, -CH ₂ in the alkyl group - is, as the oxygen atoms are not directly adjacent -O -, - COO -, - C (= O) -, - may be substituted with OCO-.

式中、Ｒ^ａｔ、Ｒ^ｂｔ、Ｒ^ｃｔ及びＲ^ｄｔは、それぞれ独立して、水素原子又は炭素原子数１〜５のアルキル基を表す。 The nitrogen-containing chain group preferably contains any of the following groups.

In the formula, R ^at , R ^bt , R ^ct, and R ^dt each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

式中、Ｓｐ^ＡＴ１は、単結合、炭素原子数１〜２５の直鎖状若しくは分岐状のアルキレン基を表す。ただし、アルキレン基中の水素原子は、−ＯＨ、−ＣＮ、−Ｗ^ＡＴ１−Ｚ^ＡＴ１又はＰ^ＡＰ１−Ｓｐ^ＡＰ１−で置換されてもよく、アルキレン基中の−ＣＨ_２−は、酸素原子が直接結合しないように環式基、−Ｏ−、−ＣＯＯ−、−Ｃ（＝Ｏ）−、−ＯＣＯ−、−ＣＨ＝ＣＨ−で置換されてもよい。
Ｗ^ＡＴ１は、単結合又は下記一般式（ＷＡＴ１）又は（ＷＡＴ２）を表す。
Ｚ^ＡＴ１は、極性要素を含む１価の基を表す。ただし、Ｚ^ＡＴ１中の水素原子は、−ＯＨ、−ＣＮ又はＰ^ＡＰ１−Ｓｐ^ＡＰ１−で置換されてもよい。 The adsorptive group is preferably a group represented by the following general formula (AT).

In the formula, Sp ^AT1 represents a single bond or a linear or branched alkylene group having 1 to 25 carbon atoms. However, the hydrogen atom in the alkylene group may be substituted with —OH, —CN, —W ^AT1 —Z ^AT1 or P ^AP1 —Sp ^AP1 —, and —CH ₂ — in the alkylene group has an oxygen atom directly. It may be substituted with a cyclic group, -O-, -COO-, -C(=O)-, -OCO-, or -CH=CH- so as not to bond.
W ^AT1 represents a single bond or the following general formula (WAT1) or (WAT2).
Z ^AT1 represents a monovalent group containing a polar element. ^However, the hydrogen atoms in ^{Z AT1} is, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with.

（式中、Ｓｐ^ＷＡＴ１及びＳｐ^ＷＡＴ２は、それぞれ独立して、単結合、炭素原子数１〜２５の直鎖状若しくは分岐状のアルキレン基を表し、アルキレン基中の水素原子は、−ＯＨ、−ＣＮ又はＰ^ＡＰ１−Ｓｐ^ＡＰ１−で置換されてもよく、アルキレン基中の−ＣＨ_２−は、酸素原子が直接隣接しないように環式基、−Ｏ−、−ＣＯＯ−、−Ｃ（＝Ｏ）−、−ＯＣＯ−又は−ＣＨ＝ＣＨ−で置換されてもよい。）

(In the formula, Sp ^WAT1 and Sp ^WAT2 each independently represent a single bond, a linear or branched alkylene group having 1 to 25 carbon atoms, and a hydrogen atom in the alkylene group is -OH, -. CN or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH ₂ in the alkylene group -, the cyclic group such that oxygen atoms are not directly adjacent, -O -, - COO -, - C (= O )-, -OCO- or -CH=CH- may be substituted.)

Sp ^AT1 , Sp ^WAT1 and Sp ^WAT2 each independently preferably represent a single bond or a linear or branched alkylene group having 1 to 20 carbon atoms, and a single bond or a linear carbon atom number. It is more preferable to represent an alkylene group having 1 to 20 carbon atoms, and it is more preferable to represent a single bond or a linear alkylene group having 2 to 10 carbon atoms.
Further, in Sp ^AT1 , Sp ^WAT1 and Sp ^WAT2 , one or two or more —CH ₂ — in the alkylene group are each independently —CH═CH—, — so that oxygen atoms are not directly adjacent to each other. It may be substituted with C≡C-, -O-, -CO-, -COO- or -OCO-.
The ^hydrogen atoms in ^{Sp AT1} and ^{Sp WAT1} are each ^{independently,} -W AT1 ^{-Z AT1} or ^P AP1 ^{-Sp AP1} - it may be substituted with.

Z ^AT1 represents a monovalent group containing a polar element and is preferably a group represented by the following general formula (ZAT1-1) or (ZAT1-2).

In the formula, Sp ^ZAT11 and Sp ^ZAT12 each independently represent a single bond or a linear or branched alkylene group having 1 to 25 carbon atoms. However, the hydrogen atom in the alkylene group may be substituted with —OH, —CN, —Z ^ZAT11 —R ^ZAT11 or P ^AP1 —Sp ^AP1 —, and —CH ₂ — in the alkylene group has an oxygen atom directly. It may be substituted with a cyclic group, -O-, -COO-, -C(=O)-, -OCO- or -CH=CH- so as not to be adjacent to each other.
Z ^ZAT11 represents a group containing a polar element.
The structure represented by the ring containing Z ^ZAT12 in the general formula (ZAT1-2) represents a 5- to 7-membered ring.
The hydrogen atom in Z ^ZAT11 and Z ^ZAT12 may be substituted with —OH, —CN or P ^AP1 —Sp ^AP1 —.
R ^ZAT11 and R ^ZAT12 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 8 carbon atoms. However, the hydrogen atoms in the alkyl group, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH ₂ in the alkyl group -, the cyclic group so as not to directly adjacent oxygen atom , -O-, ^-COO- , -C(=O)-, ^-OCO-, -CH=CH- or -Z ^ZAT11- .

The group represented by general formula (ZAT1-1) is preferably a group represented by the following general formulas (ZAT1-1-1) to (ZAT1-1-30).

Wherein a hydrogen atom bound to a carbon atom, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with.
Sp ^ZAT11 represents a single bond or a linear or branched alkylene group having 1 to 25 carbon atoms. However, the hydrogen atom in the alkylene group may be substituted with —OH, —CN, —Z ^ZAT11 —R ^ZAT11 or P ^AP1 —Sp ^AP1 —, and —CH ₂ — in the alkylene group has an oxygen atom directly. It may be substituted with a cyclic group, -O-, -COO-, -C(=O)-, -OCO- or -CH=CH- so as not to be adjacent to each other.
R ^ZAT11 represents a hydrogen atom or a linear or branched alkyl group having 1 to 8 carbon atoms. However, the hydrogen atoms in the alkyl ^{group, -OH, -CN, -Sp AT1 -W} AT1 -Z AT1 or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH in the alkyl group ₂ -, oxygen It may be substituted with a cyclic group, -O-, ^-COO- , -C(=O)-, ^-OCO-, -CH=CH- or -Z ^ZAT11- so that the atoms are not directly adjacent.

The group represented by general formula (ZAT1-2) is preferably a group represented by the following general formulas (ZAT1-2-1) to (ZAT1-2-9).

Wherein a hydrogen atom bound to a carbon atom, a halogen atom, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with.
Sp ^ZAT11 represents a single bond or a linear or branched alkylene group having 1 to 25 carbon atoms. However, the hydrogen atoms in the alkylene group, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH ₂ in the alkylene group -, the cyclic group so as not to directly adjacent oxygen atom , -O-, ^-COO- , -C(=O)-, ^-OCO-, -CH=CH- or -Z ^ZAT11- .

Examples of the group represented by formula (ZAT1-1) include the groups below.

^{Wherein, R tc} represents a hydrogen atom, an alkyl group or ^P AP1 ^-Sp carbon atoms 1 to 20 ^AP1 - represents a. However, the hydrogen atoms in the alkyl group, -OH, -CN or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH ₂ in the alkyl group -, the cyclic group so as not to directly adjacent oxygen atom , -O-, ^-COO- , -C(=O)-, ^-OCO-, -CH=CH- or -Z ^ZAT11- .
Hydrogen atoms in the ^molecule, P ^{AP1 -Sp} AP1 - may be substituted with.
* Represents a bond.

Among the groups preferable as Z ^AT1 described above, since it is possible to secure storage stability by being stably mixed in the liquid crystal composition, and to exhibit a good orientation control force derived from an appropriately high adsorption force to an adsorbent. , OH containing groups are particularly preferred. Further, the combination with (AL-1) is particularly preferable as the mesogenic group.

The orientation aid is preferably in a form in which the polar element contained in the adsorptive group or the polar element contained in the polymerizable group is localized. The adsorptive group is an important structure for vertically aligning liquid crystal molecules, and when the adsorptive group and the polymerizable group are adjacent to each other, a better alignment property can be obtained, and a favorable liquid crystal composition can be obtained. Shows solubility.
Specifically, the orientation aid is preferably in a form having a polymerizable group and an adsorptive group on the same ring of the mesogen group. In such a form, a form in which one or more polymerizable groups and one or more adsorption groups are bonded to the same ring, and at least one or one or more adsorption groups of the one or more polymerizable groups Of at least one of the above, one having a polymerizable group and an adsorptive group on the same ring, one of which is bonded to the other.
Further, in this case, a hydrogen atom in the spacer group bonded to the polymerizable group may be replaced with an adsorptive group, and further, a hydrogen atom in the adsorptive group may be replaced with a polymerizable group through the spacer group. Good.

式中、炭素原子に結合する水素原子は、炭素原子数１〜２５の直鎖状若しくは分岐状のアルキル基、−ＯＨ、−ＣＮ、−Ｓｐ^ＡＴ１−Ｗ^ＡＴ１−Ｚ^ＡＴ１又はＰ^ＡＰ１−Ｓｐ^ＡＰ１−で置換されてもよい。ただし、アルキル基中の水素原子は、−ＯＨ、−ＣＮ、−Ｓｐ^ＡＴ１−Ｗ^ＡＴ１−Ｚ^ＡＴ１又はＰ^ＡＰ１−Ｓｐ^ＡＰ１−で置換されてもよく、アルキル基中の−ＣＨ_２−は、酸素原子が直接結合しないように環式基、−Ｏ−、−ＣＯＯ−、−Ｃ（＝Ｏ）−、−ＯＣＯ−又は−ＣＨ＝ＣＨ−で置換されてもよい。
Ｒ^ＡＫ１は、一般式（ＡＫ）におけるＲ^ＡＫ１と同じ意味を表す。 The orientation aid (spontaneous orientation compound) is preferably a compound represented by the following general formula (SAL).

In the formula, the hydrogen atom bonded to the carbon atom is a linear or branched alkyl group having 1 to 25 carbon atoms, -OH, -CN, -Sp ^AT1- W ^AT1- Z ^AT1 or P ^AP1- Sp ^AP1. It may be replaced with -. However, the hydrogen atoms in the alkyl ^{group, -OH, -CN, -Sp AT1 -W} AT1 -Z AT1 or ^P AP1 ^{-Sp AP1} - may be substituted with, -CH in the alkyl group ₂ -, oxygen It may be substituted with a cyclic group, -O-, -COO-, -C(=O)-, -OCO- or -CH=CH- so that the atom is not directly bonded.
R ^AK1 has the same meaning as R ^AK1 in formula (AK).

A ^AL1 and A ^AL2 each independently have the same meaning as A ^AL1 and A ^AL2 in formula (AL).
Z ^AL1 has the same meaning as Z ^AL1 in formula (AL).
m ^AL1 has the same meaning as m ^AL1 in formula (AL).
Sp ^AT1 has the same meaning as Sp ^AT1 in formula (AT).
W ^AT1 has the same meaning as W ^AT1 in formula (AT).
Z ^AT1 has the same meaning as Z ^AT1 in formula (AT).

The compound represented by the general formula (SAL) is preferably a compound represented by the following formulas (SAL-1.1) to (SAL-2.11).

式（Ｐ）中、Ｒ^ｐ１は、水素原子、フッ素原子、シアノ基、炭素原子数１〜１５のアルキル基又は−Ｓｐ^ｐ２−Ｐ^ｐ２を表す。ただし、アルキル基中に存在する１個又は隣接しない２個以上の−ＣＨ_２−は、それぞれ独立して、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−Ｏ−、−ＣＯ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよい。また、アルキル基中に存在する１個又は２個以上の水素原子は、それぞれ独立して、シアノ基、フッ素原子又は塩素原子で置換されてもよい。 ((Polymerizable compound))
The liquid crystal composition of the present invention preferably contains a polymerizable compound represented by the following general formula (P). Such a polymerizable compound has a function of imparting a predetermined pretilt angle to liquid crystal molecules. The liquid crystal composition may contain two or more kinds of the polymerizable compounds.

In the formula (P), R ^p1 represents a hydrogen atom, a fluorine atom, a cyano group, an alkyl group having 1 to 15 carbon atoms, or —Sp ^p2 —P ^p2 . However, one or two or more non-adjacent —CH ₂ — present in the alkyl group are each independently —CH═CH—, —C≡C—, —O—, —CO—, —COO. -Or -OCO- may be substituted. Further, one or more hydrogen atoms present in the alkyl group may be independently substituted with a cyano group, a fluorine atom or a chlorine atom.

（式中、Ｒ^ｐ１１及びＲ^ｐ１２は、それぞれ独立して、水素原子、炭素原子数１〜５のアルキル基又は炭素原子数１〜５のハロゲン化アルキル基を表し、Ｗ^ｐ１１は、単結合、−Ｏ−、−ＣＯＯ−、−ＯＣＯ−、又は−ＣＨ_２−を表し、ｔ^ｐ１１は、０、１又は２を表すが、分子内にＲ^ｐ１１、Ｒ^ｐ１２、Ｗ^ｐ１１及び／又はｔ^ｐ１１が複数存在する場合、それらは同一であっても異なってもよい。） P ^p1 and P ^p2 each independently represent one of the following general formulas (P ^p1-1 ) to formula (P ^p1-9 ).

(In the formula, R ^p11 and R ^p12 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 5 carbon atoms, and W ^p11 is a single bond, -O -, - COO -, - OCO-, or -CH ₂ - ^{represents, t pi 1} may represent 0, 1, or ^{2, R p11, R p12,} W p11 and / or ^{t pi 1} in the molecule When there are two or more, they may be the same or different.)

Sp ^p1 and Sp ^p2 each independently represent a single bond or a spacer group.
Z ^p1 and Z ^p2 are each independently a single bond, —O—, —S—, —CH ₂ —, —OCH ₂ —, —CH ₂ O—, —CO—, —C ₂ H ₄ —, _{-COO -, - OCO -, -} OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR ZP1 -, - NR ZP1 -CO -, - SCH 2 -, - CH 2 S ^{-, - CH = CR ZP1 -COO} -, - CH = CR ZP1 -OCO -, - COO-CR ZP1 = CH -, - OCO-CR ZP1 = CH -, - COO-CR ZP1 = CH-COO -, - ^{COO-CR ZP1 = CH-OCO} -, - OCO-CR ZP1 = CH-COO -, - OCO-CR ZP1 = CH-OCO -, - (CH 2) 2 -COO -, - (CH 2) 2 -OCO _{-, - OCO- (CH 2)} 2 -, - (C = O) -O- (CH 2) 2 -, - CH = CH -, - CF = CF -, - CF = CH -, - CH = CF _{-, - CF 2 -, -} CF 2 O -, - OCF 2 -, - CF 2 CH 2 -, - CH 2 CF 2 -, - CF 2 CF 2 - or -C≡C- ^{(wherein, R ZP1} Each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, but when a plurality of R ^ZP1's are present in the molecule, they may be the same or different.

A ^p1 , A ^p2 and A ^p3 are each independently,
(A ^p )1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other may be substituted with —O—. )
^(B p) 1,4-phenylene group (the one -CH = or nonadjacent present in group two or more -CH = may be replaced by -N =.) And ( c ^p) naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, naphthalene-1,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, decahydro Naphthalene-2,6-diyl group, phenanthrene-2,7-diyl group or anthracene-2,6-diyl group (one -CH= present in these groups or two or more non-adjacent- CH= may be substituted with -N=.)
Group selected from the group consisting of (said group (a ^p), group (b ^p) and group (c ^p) are each independently hydrogen atoms present in this group, a halogen atom, carbon atom 1 ~8 alkyl group, or an alkenyl group having 1 to 8 carbon atoms, a cyano group or -Sp ^p2- P ^p2 may be substituted).

m ^p1 represents 0, 1, 2 or 3.
When a plurality of Z ^p1 , A ^p2 , Sp ^p2 and/or P ^p2 are present in the molecule, they may be the same or different. ^{However, A p3 is} the ^{m p1} is ^0, when ^{A p1} is a group ^{(c p),} it may be a single bond.
Note that the alignment aid is excluded from the polymerizable compound.

R ^p1 is preferably —Sp ^p2 —P ^p2 .
P ^p1 and P ^p2 are preferably each independently one of the formulas (P ^p1 -1) to (P ^p1 -3), and more preferably (P ^p1 -1).
R ^p11 and R ^p12 are preferably each independently a hydrogen atom or a methyl group.
^tp11 is preferably 0 or 1.
W ^p11 is preferably a single bond, —CH ₂ — or —C ₂ H ₄ —.
m ^p1 is preferably 0, 1 or 2, and is preferably 0 or 1.

Z ^p1 and ^{Z p2} are each independently a single _{bond, -OCH 2 -, - CH 2} O -, - CO -, - C 2 H 4 -, - COO -, - OCO -, - COOC 2 H 4 _{-, - OCOC 2 H 4 -} , - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH -, - CF 2 -, - CF 2 O -, - (CH 2) 2 -COO _{-, - (CH 2) 2} -OCO -, - OCO- (CH 2) 2 -, - CH = CH-COO -, - COO-CH = CH -, - OCOCH = CH -, - COO- (CH 2 ) ₂ -, - OCF ₂ - or a is preferably -C≡C-, a single _{bond, -OCH 2 -, - CH 2} O -, - C 2 H 4 -, - COO -, - OCO -, - _{COOC 2 H 4 -, - OCOC} 2 H 4 -, - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH -, - (CH 2) 2 -COO -, - (CH 2) _{2 -OCO -, - OCO- (CH} 2) 2 -, - CH = CH-COO -, - COO-CH = CH -, - OCOCH = CH -, - COO- (CH 2) 2 - or -C≡ It is more preferably C-.

Only one of Z ^p1 and Z ^p2 existing in the molecule is —OCH ₂ —, —CH ₂ O—, —C ₂ H ₄ —, —COO—, —OCO—, —COOC ₂ H ₄ —, _{-OCOC 2 H 4 -, - C} 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH -, - (CH 2) 2 -COO -, - (CH 2) 2 -OCO -, - _{OCO- (CH 2) 2 -,} - CH = CH-COO -, - COO-CH = CH -, - OCOCH = CH -, - COO- (CH 2) 2 - or a -C≡C-, other Are all single bonds, and only one of Z ^p1 and Z ^p2 present in the molecule is —OCH ₂ —, —CH ₂ O—, —C ₂ H ₄ —, —COO— or —OCO. It is more preferable that all of them are a single bond, and it is further preferable that all of Z ^p1 and Z ^p2 existing in the molecule are single bonds.
Further, only one of Z ^p1 and Z ^p2 existing in the molecule is —CH═CH—COO—, —COO—CH═CH—, —(CH ₂ ) ₂ —COO—, —(CH ₂ ) _{2 -OCO -, - O-CO- (} CH 2) 2 -, - COO- (CH 2) 2 - is a linking group selected from the group consisting of, it is preferable others are all single bonds.

Sp ^p1 and Sp ^p2 each independently represent a single bond or a spacer group, and the spacer group is preferably an alkylene group having 1 to 30 carbon atoms. However, -CH ₂ in the alkylene group - is, -O insofar as each other oxygen atoms are not linked directly -, - CO -, - COO -, - OCO -, - substituted with CH = CH- or -C≡C- The hydrogen atom in the alkylene group may be replaced with a halogen atom.
Among them, Sp ^p1 and Sp ^p2 are preferably each independently a linear alkylene group having 1 to 10 carbon atoms or a single bond.
A ^p1 , A ^p2 and A ^p3 are each independently preferably a 1,4-phenylene group or a 1,4-cyclohexylene group, and more preferably a 1,4-phenylene group.
The 1,4-phenylene group is preferably substituted with one fluorine atom, one methyl group or one methoxy group in order to improve the compatibility with liquid crystal molecules (liquid crystal compounds).

The amount of the polymerizable compound contained in the liquid crystal composition is preferably 0.05 to 10% by mass, more preferably 0.1 to 8% by mass, and 0.1 to 5% by mass. More preferably, it is more preferably 0.1 to 3% by mass, further preferably 0.2 to 2% by mass, further preferably 0.2 to 1.3% by mass, and 0. It is particularly preferable that the content is 0.2 to 1% by mass, and most preferably 0.2 to 0.56% by mass.

The preferable lower limit values thereof are 0.01% by mass, 0.03% by mass, 0.05% by mass, 0.08% by mass, 0.1% by mass and 0.15% by mass. %, 0.2% by mass, 0.25% by mass, and 0.3% by mass. On the other hand, the preferable upper limit values are 10% by mass, 8% by mass, 5% by mass, 3% by mass, 1.5% by mass, 1.2% by mass, and 1% by mass. %, 0.8% by mass, and 0.5% by mass.

When the amount of the polymerizable compound is small, the effect of adding the polymerizable compound to the liquid crystal composition is unlikely to appear, and for example, depending on the type of the liquid crystal molecule or the alignment aid, the alignment control force of the liquid crystal molecule is weak or weak with time. There may be problems such as being lost. On the other hand, if the amount of the polymerizable compound is too large, for example, depending on the illuminance of ultraviolet rays, the amount of the polymerizable compound remaining after curing increases, curing takes time, and the reliability of the liquid crystal composition decreases. There may be problems. Therefore, it is preferable to set the amount of the polymerizable compound in consideration of these balances.

Preferable examples of the polymerizable compound represented by the general formula (P) include the polymerizable compounds represented by the following formulas (P-1-1) to (P-1-46).

式中、Ｐ^ｐ１１、Ｐ^ｐ１２、Ｓｐ^ｐ１１及びＳｐ^ｐ１２は、一般式（Ｐ）におけるＰ^ｐ１、Ｐ^ｐ２、Ｓｐ^ｐ１及びＳｐ^ｐ２と同じ意味を表す。

In the formula, P ^p11 , P ^p12 , Sp ^p11, and Sp ^p12 have the same meanings as P ^p1 , P ^p2 , Sp ^p1, and Sp ^p2 in the general formula (P).

式中、Ｐ^ｐ２１、Ｐ^ｐ２２、Ｓｐ^ｐ２１及びＳｐ^ｐ２２は、一般式（Ｐ）におけるＰ^ｐ１、Ｐ^ｐ２、Ｓｐ^ｐ１及びＳｐ^ｐ２と同じ意味を表す。 Moreover, as a preferable example of the polymerizable compound represented by the general formula (P), a polymerizable compound represented by the following formula (P-2-1) to formula (P-2-12) can also be mentioned.

In the formula, P ^p21 , P ^p22 , Sp ^p21, and Sp ^p22 have the same meanings as P ^p1 , P ^p2 , Sp ^p1, and Sp ^p2 in the general formula (P).

Further, preferable examples of the polymerizable compound represented by the general formula (P) also include the polymerizable compounds represented by the following formulas (P-3-1) to (P-3-15).

式中、Ｐ^ｐ３１、Ｐ^ｐ３２、Ｓｐ^ｐ３１及びＳｐ^ｐ３２は、一般式（Ｐ）におけるＰ^ｐ１、Ｐ^ｐ２、Ｓｐ^ｐ１及びＳｐ^ｐ２と同じ意味を表す。

In the formula, P ^p31 , P ^p32 , Sp ^p31, and Sp ^p32 have the same meanings as P ^p1 , P ^p2 , Sp ^p1, and Sp ^p2 in the general formula (P).

Moreover, as a preferable example of the polymerizable compound represented by the general formula (P), a polymerizable compound represented by the following formula (P-4-1) to formula (P-4-19) can also be mentioned.

式中、Ｐ^ｐ４１、Ｐ^ｐ４２、Ｓｐ^ｐ４１及びＳｐ^ｐ４２は、一般式（Ｐ）におけるＰ^ｐ１、Ｐ^ｐ２、Ｓｐ^ｐ１及びＳｐ^ｐ２と同じ意味を表す。

In the formula, P ^p41 , P ^p42 , Sp ^p41 and Sp ^p42 have the same meanings as P ^p1 , P ^p2 , Sp ^p1 and Sp ^p2 in the general formula (P).

((Liquid crystal molecule))
The liquid crystal molecule preferably has negative dielectric anisotropy and contains at least one of the compounds represented by the general formulas (N-1) to (N-3).

In the formula, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represent an alkyl group having 1 to 8 carbon atoms, but any 1 Or two or more non-adjacent —CH ₂ — are each independently substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—. Good.
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are each independently,
(A) 1,4-cyclohexylene group (any one or two or more non-adjacent —CH ₂ — present in the group may be substituted with —O—),
(B) 1,4-phenylene group (any one or two or more non-adjacent -CH= present in the group may be substituted with -N=),
(C) a naphthalene-2,6-diyl group, a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or a decahydronaphthalene-2,6-diyl group (any one existing in the group) Or two or more -CH= which are not adjacent to each other may be substituted with -N=), and (d) represents a group selected from the group consisting of 1,4-cyclohexenylene groups. The group (a), the group (b), the group (c) and the group (d) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom.

Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are each independently a single bond, —CH ₂ CH ₂ —, —(CH ₂ ) ₄ —, —OCH ₂ —, —CH _{2 O -, - COO -, -} OCO -, - OCF 2 -, - CF 2 O -, - CH = N-N = CH -, - CH = CH -, - CF = CF- or -C≡C- the Represent
X ^N21 represents a hydrogen atom or a fluorine atom.
T ^N31 is, -CH ₂ - represents an or an oxygen atom.
n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31, and n ^N32 each independently represent an integer of 0 to 3, but n ^N11 +n ^N12 , n ^N21 +n ^N22, and n ^N31 +n ^N32 , respectively. Independently, 1 or 2 or 3, and when there are a plurality of A ^{N11 to} A ^N32 and Z ^{N11 to} Z ^N32 , they may be the same or different.

^RN11 , ^RN12 , ^RN21 , ^RN22 , ^RN31, and ^RN32 are each independently an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 8 carbon atoms. Or an alkenyloxy group having 2 to 8 carbon atoms is preferable, and an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or It is more preferably an alkenyloxy group having 2 to 5 carbon atoms, further preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and having 2 to 5 carbon atoms. An alkyl group or an alkenyl group having 2 to 3 carbon atoms is particularly preferable, and an alkenyl group having 3 carbon atoms (propenyl group) is most preferable.

When they are bonded to a ring structure which is a benzene ring (aromatic ring), they are a linear alkyl group having 1 to 5 carbon atoms and a linear alkoxy group having 1 to 4 carbon atoms. Alternatively, it is preferably an alkenyl group having 4 to 5 carbon atoms, and when it is bonded to a saturated ring structure such as a cyclohexane ring, a pyran ring or a dioxane ring, a linear alkyl group having 1 to 5 carbon atoms is used. It is preferably a group, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms. In order to stabilize the nematic phase, it is preferable that the number of carbon atoms (the total number of carbon atoms and the number of oxygen atoms in the case of containing oxygen atoms) is 5 or less. It is also preferably chain-like.

各式中の黒点は、環構造中の炭素原子を表す。 The alkenyl group is preferably selected from the groups represented by any of the following formulas (R1) to (R5).

The black dots in each formula represent carbon atoms in the ring structure.

Each of A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 is preferably aromatic when it is required to increase Δn, in order to improve the response speed. It is preferably aliphatic.
Specifically, A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are each independently a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro. -1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexene Cenylene group, 1,4-bicyclo[2.2.2]octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1, It is preferably a 2,3,4-tetrahydronaphthalene-2,6-diyl group, more preferably one of the groups represented by the following chemical formula 60, and a trans-1,4-cyclohexylene group, 1 More preferably, it is a 4-cyclohexenylene group or a 1,4-phenylene group.

^{Z N11, Z N12, Z N21} , Z N22, Z N31 and ^{Z N32} are each _{independently, -CH 2 O -, - CF} 2 O -, - CH 2 CH 2 -, - CF 2 CF 2 - or it is preferably a single _{bond, -CH 2 O -, - CH} 2 CH 2 - or more preferably a single bond, _-CH 2 O-or a single bond is more preferable.
X ^N21 is preferably a fluorine atom.
T ^N31 is preferably an oxygen atom.
n ^N11 +n ^N12 , n ^N21 +n ^N22 and n ^N31 +n ^N32 are preferably 1 or 2. Specifically, a combination in which n ^N11 is 1 and n ^N12 is 0, a combination in which n ^N11 is 2 and n ^N12 is 0, a combination in which n ^N11 is 1 and n ^N12 is 1, and n ^N21 is 1 and n ^N22 is 0, n ^N21 is 2 and n ^N22 is 0, n ^N31 is 1 and n ^N32 is 0, n ^N31 is 2 and n ^N32 is 0 Certain combinations are preferred.

The amounts of the compounds represented by formulas (N-1) to (N-3) contained in the liquid crystal composition are preferably as follows. That is, the preferable lower limit value is 1% by mass, 10% by mass, 20% by mass, 30% by mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass. % And 80% by mass. On the other hand, the preferable upper limit values are 95 mass %, 85 mass %, 75 mass %, 65 mass %, 55 mass %, 45 mass %, 35 mass %, 25 mass %, and 20 mass %.
When keeping the viscosity (η) of the liquid crystal composition low and increasing the response speed, the amount of the compounds represented by the general formulas (N-1) to (N-3) has a low lower limit and a low upper limit. Is preferred. Further, in order to maintain the nematic phase-isotropic liquid phase transition temperature (Tni) of the liquid crystal composition at a high level and improve the temperature stability, it is preferable that the lower limit and the upper limit of the amount be low. When the dielectric anisotropy (Δε) of the liquid crystal composition is increased in order to keep the driving voltage of the liquid crystal display element low, the lower limit and the upper limit of the amount are preferably high.

Examples of the compound represented by the general formula (N-1) include compounds represented by the following general formulas (N-1a) to (N-1g).

^{Wherein, R N11} and ^{R N12} are the same as defined ^{R N11} and ^{R N12} in the general formula (N-1).
^nNa11 represents 0 or 1.
n ^Nb11 represents 1 or 2.
n ^Nc11 represents 0 or 1.
n ^Nd11 represents 1 or 2.
n ^Ne11 represents 1 or 2.
n ^Nf12 represents 1 or 2.
n ^Ng11 represents 1 or 2.

A ^Ne11 represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.
A ^Ng11 represents a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group, but at least one represents a 1,4-cyclohexenylene group.
Z ^Ne11 represents a single bond or an ethylene group, but at least one represents an ethylene group.
However, when a plurality of A ^Ne11 , Z ^Ne11 and/or A ^Ng11 are present, they may be the same or different.

式中、Ｒ^Ｎ１１１及びＲ^Ｎ１１２は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^Ｎ１１１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、プロピル基、ペンチル基又はビニル基であることがより好ましい。
Ｒ^Ｎ１１２は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基又はブトキシ基であることがより好ましい。 More specifically, the compound represented by the general formula (N-1) is preferably selected from compounds represented by the following general formulas (N-1-1) to (N-1-21).
The compound represented by formula (N-1-1) is the following compound.

In the formula, R ^N111 and R ^N112 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably a propyl group, a pentyl group or a vinyl group.
R ^N112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and more preferably an ethoxy group or a butoxy group. ..

The compound represented by formula (N-1-1) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-1) contained in the liquid crystal composition is preferably set higher when the improvement in Δε is important, and the solubility at low temperature is important. In this case, the effect is high when the value is set high, and the effect is high when the value is set low when Tni is important. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
Its preferable lower limit value is 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass, It is 35 mass %. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass. %, 15 mass %, 13 mass %, 10 mass %, 8 mass %, 7 mass %, 6 mass %, 5 mass %, 3 mass %.

Further, the compound represented by the general formula (N-1-1) is preferably selected from the compounds represented by the following formulas (N-1-1.1) to (N-1-1.25). Are more preferably selected from compounds represented by the following formulas (N-1-1.1) to (N-1-1.4), and the following formulas (N-1-1.1) and (N- More preferably, it is selected from the compounds represented by 1-1.3).

The compounds represented by the formulas (N-1-1.1) to (N-1-1.25) can be used alone or in combination of two or more.
The amounts of the compounds represented by formulas (N-1-1.1) to (N-1-1.25) contained in the liquid crystal composition, alone or in combination, are preferably as follows. That is, the preferable lower limit value is 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass. %, 35% by mass. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass. %, 15 mass %, 13 mass %, 10 mass %, 8 mass %, 7 mass %, 6 mass %, 5 mass %, 3 mass %.

式中、Ｒ^Ｎ１２１及びＲ^Ｎ１２２は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^Ｎ１２１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基、ブチル基又はペンチル基であることがより好ましい。
Ｒ^Ｎ１２２は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、メチル基、プロピル基、メトキシ基、エトキシ基又はプロポキシ基であることがより好ましい。 The compound represented by formula (N-1-2) is the following compound.

In the formula, R ^N121 and R ^N122 each independently have the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group or a pentyl group.
R ^N122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and a methyl group, a propyl group, a methoxy group or an ethoxy group. Alternatively, it is more preferably a propoxy group.

The compounds represented by formula (N-1-2) can be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-2) contained in the liquid crystal composition is preferably set higher when the improvement in Δε is important, and the solubility at low temperature is important. In this case, the effect is high when the value is set low, and when Tni is important, the effect is high when the value is set high. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
Its preferable lower limit value is 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, It is 33 mass %, 35 mass %, 37 mass %, 40 mass %, 42 mass %. On the other hand, the preferable upper limit values are 50 mass %, 48 mass %, 45 mass %, 43 mass %, 40 mass %, 38 mass %, 35 mass %, 33 mass %, 30 mass %, 28 mass %, 25 mass %. %, 23 mass %, 20 mass %, 18 mass %, 15 mass %, 13 mass %, 10 mass %, 8 mass %, 7 mass %, 6 mass %, 5 mass %.

Further, the compound represented by the general formula (N-1-2) is preferably selected from compounds represented by the following formulas (N-1-2.1) to (N-1-2.25). , Formulas (N-1-2.3) to (N-1-2.7), formulas (N-1-2.10), formulas (N-1-2.11), formulas (N-1-). It is more preferable to be selected from the compounds represented by 2.13) and the formula (N-1-2.20).
The compound represented by the general formula (N-1-2) is represented by the formulas (N-1-2.3) to (N-1-2.7) when the improvement in Δε is important. Are selected from the compounds represented by the formula (N-1-2.10), the formula (N-1-2.11) and the formula (N-1-2) when the improvement of T _ni is important. .13) are preferred, and when the improvement in response speed is important, the compound represented by formula (N-1-2.20) is preferred.

The compounds represented by the formulas (N-1-2.1) to (N-1-2.25) can be used alone or in combination of two or more.
The amounts of the compounds represented by formulas (N-1-2.1) to (N-1-2.25) contained in the liquid crystal composition, alone or in combination, are preferably as follows. That is, the preferable lower limit value is 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass. %, 35% by mass. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass. %, 15 mass %, 13 mass %, 10 mass %, 8 mass %, 7 mass %, 6 mass %, 5 mass %, 3 mass %.

式中、Ｒ^Ｎ１３１及びＲ^Ｎ１３２は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^Ｎ１３１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基又はブチル基であることがより好ましい。
Ｒ^Ｎ１３２は、炭素原子数１〜５のアルキル基、炭素原子数３〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、１−プロペニル基、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-3) is the following compound.

In the formula, R ^N131 and R ^N132 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.
R ^N132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 3 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and is 1-propenyl group, ethoxy group, propoxy group or It is more preferably a butoxy group.

The compounds represented by formula (N-1-3) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-3) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is high when the value is set high, and when Tni is important, the effect is high when the value is set high. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Furthermore, the compound represented by the general formula (N-1-3) is preferably selected from compounds represented by the formulas (N-1-3.1) to (N-1-3.21), More preferably, it is selected from compounds represented by formulas (N-1-3.1) to (N-1-3.7) and formula (N-1-3.21), and formula (N-1- 3.1), formula (N-1 -3.2), formula (N-1 -3.3), formula (N-1 -3.4) and formula (N-1 -3.6) More preferably, it is selected from the compounds described below.

The compounds represented by the formulas (N-1-3.1) to (N-1-3.4), the formula (N-1-3.6) and the formula (N-1-3.21) are 1 Although they can be used alone or in combination of two or more, they are represented by the compound represented by the formula (N-1-3.1) and the formula (N-1-3.2). A combination with a compound and a combination of two or three kinds selected from the formula (N-1-3.3), the formula (N-1-3.4) and the formula (N-1-3.6) are preferable.
In the formulas (N-1-3.1) to (N-1-3.4), the formula (N-1-3.6) and the formula (N-1-3.21) contained in the liquid crystal composition, The amounts of the compounds represented by themselves or in combination are preferably as follows. That is, the preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^Ｎ１４１及びＲ^Ｎ１４２は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^Ｎ１４１及びＲ^Ｎ１４２は、それぞれ独立して、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、メチル基、プロピル基、エトキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-4) is the following compound.

^{Wherein, R N141} and ^{R N142} are each independently the same meaning as ^{R N11} and ^{R N12} in the general formula (N-1).
R ^N141 and ^{R N142} are each independently an alkyl group having 1 to 5 carbon atoms is preferably an alkenyl group or an alkoxy group having 1 to 4 carbon atoms carbon atoms 4-5, methyl group, It is more preferably a propyl group, an ethoxy group or a butoxy group.

The compound represented by formula (N-1-4) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-4) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is set high when the value is set high, and the effect is set high when the value is emphasized in Tni. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 11% by mass, 10% by mass. % And 8% by mass.

Further, the compound represented by the general formula (N-1-4) is preferably selected from compounds represented by the formulas (N-1-4.1) to (N-1-4.24), More preferably, it is selected from the compounds represented by the formulas (N-1-4.1) to (N-1-4.4), and the formula (N-1-4.1) and the formula (N-1-). 4.2) and compounds represented by formula (N-1-4.4) are more preferred.

The compounds represented by the formulas (N-1-4.1) to (N-1-4.24) can be used alone or in combination of two or more.
The amounts of the compounds represented by formulas (N-1-4.1) to (N-1-4.24) contained in the liquid crystal composition, alone or in combination, are preferably as follows. That is, the preferable lower limit values are 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 11% by mass, 10% by mass. % And 8% by mass.

式中、Ｒ^Ｎ１５１及びＲ^Ｎ１５２は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^Ｎ１５１及びＲ^Ｎ１５２は、それぞれ独立して、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エチル基、プロピル基又はブチル基であることがより好ましい。 The compound represented by formula (N-1-5) is the following compound.

In the formula, R ^N151 and R ^N152 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N151 and R ^N152 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, an ethyl group, More preferably, it is a propyl group or a butyl group.

The compound represented by formula (N-1-5) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-5) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, a lower setting has a higher effect, and when Tni is important, a higher setting has a higher effect. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 8% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Further, the compound represented by the general formula (N-1-5) is preferably selected from the compounds represented by the formulas (N-1-5.1) to (N-1-5.12), More preferably, it is selected from the compounds represented by formula (N-1-5.1), formula (N-1-5.2) and formula (N-1-5.4).

The compounds represented by the formula (N-1-5.1), the formula (N-1-5.2) and the formula (N-1-5.4) may be used alone or in combination of 2 It is also possible to use more than one type.
A compound represented by formula (N-1-5.1), formula (N-1-5.2) and formula (N-1-5.4) contained in the liquid crystal composition, either alone or in combination; The amount is preferably as follows. That is, the preferable lower limit values are 5% by mass, 8% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^{Ｎ１１０１}及びＲ^{Ｎ１１０２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１１０１}は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基、ブチル基、ビニル基又は１−プロペニル基であることがより好ましい。
Ｒ^{Ｎ１１０２}は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-10) is the following compound.

In the formula, R ^N1101 and R ^N1102 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1101 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl group. preferable.
R ^N1102 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group. Is more preferable.

The compound represented by formula (N-1-10) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-10) contained in the liquid crystal composition is preferably set higher when the improvement in Δε is important, and the solubility at low temperature is important. In this case, the effect is set high when the value is set high, and the effect is set high when the value is emphasized in Tni. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Further, the compound represented by the general formula (N-1-10) is preferably selected from compounds represented by the formulas (N-1-10.1) to (N-1-1.14), More preferably, it is selected from compounds represented by formulas (N-1-10.1) to (N-1-10.5), and formulas (N-1-10.1) and (N-1-). More preferably, it is selected from the compounds represented by 10.2).

The compounds represented by formula (N-1-10.1) and formula (N-1-10.2) may be used alone or in combination of two or more.
The amounts of the compounds represented by formula (N-1-10.1) and formula (N-1-10.2) contained in the liquid crystal composition, alone or in combination, are preferably as follows. .. That is, the preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^{Ｎ１１１１}及びＲ^{Ｎ１１１２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１１１１}は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基、ブチル基、ビニル基又は１−プロペニル基であることがより好ましい。
Ｒ^{Ｎ１１１２}は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by the general formula (N-1-11) is the following compound.

In the formula, R ^N1111 and R ^N1112 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl group. preferable.
R ^N1112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group. Is more preferable.

The compound represented by formula (N-1-11) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-11) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, a lower setting has a higher effect, and when Tni is important, a higher setting has a higher effect. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Furthermore, the compound represented by the general formula (N-1-11) is preferably selected from compounds represented by the formulas (N-1-11.1) to (N-1-11.14), More preferably, it is selected from the compounds represented by formulas (N-1-11.1) to (N-1-11.14), and formulas (N-1-11.2 and formula (N-1-11) More preferably, it is selected from the compounds represented by 4).

The compounds represented by formula (N-1-11.2) and formula (N-1-11.4) can be used alone or in combination of two or more.
The amounts of the compounds represented by formula (N-1-11.2) and formula (N-1-11.4) contained in the liquid crystal composition, alone or in combination, are preferably as follows. .. That is, the preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^{Ｎ１１２１}及びＲ^{Ｎ１１２２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１１２１}は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基又はブチル基であることがより好ましい。
Ｒ^{Ｎ１１２２}は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-12) is the following compound.

In the formula, R ^N1121 and R ^N1122 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.
R ^N1122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group. Is more preferable.

The compound represented by formula (N-1-12) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-12) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is set high when the value is set high, and the effect is set high when the value is emphasized in Tni. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^{Ｎ１１３１}及びＲ^{Ｎ１１３２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１１３１}は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基又はブチル基であることがより好ましい。
Ｒ^{Ｎ１１３２}は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-13) is the following compound.

In the formula, R ^N1131 and R ^N1132 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.
R ^N1132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group. Is more preferable.

The compound represented by formula (N-1-13) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-13) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is high when set to a high value, and when Tni is important, the effect is high when set to a high value. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

式中、Ｒ^{Ｎ１１４１}及びＲ^{Ｎ１１４２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１１４１}は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、メチル基、エチル基、プロピル基又はブチル基であることがより好ましい。
Ｒ^{Ｎ１１４２}は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましく、エトキシ基、プロポキシ基又はブトキシ基であることがより好ましい。 The compound represented by formula (N-1-14) is the following compound.

In the formula, R ^N1141 and R ^N1142 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1141 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably a methyl group, an ethyl group, a propyl group or a butyl group.
R ^N1142 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and an ethoxy group, a propoxy group or a butoxy group. Is more preferable.

The compound represented by formula (N-1-14) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-14) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is high when set to a high value, and when Tni is important, the effect is high when set to a high value. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Further, the compound represented by the general formula (N-1-14) is preferably selected from the compounds represented by the formulas (N-1-14. 1) to (N-1-14.5), More preferably, it is selected from the compounds represented by formulas (N-1-14.1) to (N-1-14.3), and formulas (N-1-14.2) and formula (N-1-1). More preferably, it is selected from the compounds represented by 14.3).

式中、Ｒ^{Ｎ１２２１}及びＲ^{Ｎ１２２２}は、それぞれ独立して、一般式（Ｎ−１）におけるＲ^Ｎ１１及びＲ^Ｎ１２と同じ意味を表す。
Ｒ^{Ｎ１２２１}及びＲ^{Ｎ１２２２}は、それぞれ独立して、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましく、エチル基、プロピル基又はブチル基であることがより好ましい。 The compound represented by the general formula (N-1-22) is the following compound.

In the formula, R ^N1221 and R ^N1222 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).
R ^N1221 and R ^N1222 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. preferable.

The compound represented by formula (N-1-22) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (N-1-22) contained in the liquid crystal composition is preferably set higher when the improvement of Δε is important, and the solubility at low temperature is important. In this case, the effect is high when set to a high value, and when Tni is important, the effect is high when set to a high value. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 5% by mass. %.

Further, the compound represented by the general formula (N-1-22) is preferably selected from the compounds represented by the formulas (N-1-22.1) to (N-1-22.12), More preferably, it is selected from compounds represented by formulas (N-1-22.1) to (N-1-22.5), and formulas (N-1-22.1) to (N-1-22). More preferably, it is selected from the compounds represented by 4).

式中、Ｒ^Ｌ１及びＲ^Ｌ２は、それぞれ独立して、炭素原子数１〜８のアルキル基を表すが、該アルキル基中に存在する任意の１個又は隣接しない２個以上の−ＣＨ_２−は、それぞれ独立して、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−Ｏ−、−ＣＯ−、−ＣＯＯ−又は−ＯＣＯ−で置換されてもよい。
ｎ^Ｌ１は、０、１、２又は３を表す。 The liquid crystal composition may further contain at least one selected from compounds (liquid crystal molecules) represented by the following general formula (L). The compound represented by the general formula (L) has no or extremely low dielectric anisotropy. Therefore, various characteristics of the liquid crystal composition can be adjusted by incorporating such a compound into the liquid crystal composition.

In the formula, R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, but any one or two or more —CH ₂ — which are not adjacent to each other present in the alkyl group. May each independently be substituted with -CH=CH-, -C[identical to]C-, -O-, -CO-, -COO- or -OCO-.
n ^L1 represents 0, 1, 2 or 3.

A ^L1 , A ^L2, and A ^L3 are each independently
(A) 1,4-cyclohexylene group (any one or two or more non-adjacent —CH ₂ — present in the group may be substituted with —O—),
(B) 1,4-phenylene group (any one or two or more non-adjacent -CH= present in the group may be substituted with -N=), and (c) naphthalene-. 2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (any one present in the group or non-adjacent 2 One or more -CH= may be replaced by -N=.)
The group (a), the group (b) and the group (c) described above each independently may be substituted with a cyano group, a fluorine atom or a chlorine atom.

Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, —(CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —. _{OCF 2 -, - CF 2 O} -, - CH = N-N = CH -, - CH = CH -, - representing the CF = CF- or -C≡C-.
When n ^L1 is 2 or 3 and a plurality of A ^L2 are present, they may be the same or different.
When n ^L1 is 2 or 3 and a plurality of Z ^L3 are present, they may be the same or different.
However, the compounds represented by the general formulas (N-1), (N-2) and (N-3) are excluded.

The compounds represented by formula (L) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected depending on the desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The type of compound used is, for example, one type in one embodiment of the present invention. Alternatively, the types of compounds used in another embodiment of the present invention are two types, three types, four types, five types, six types, seven types, and eight types. And 9 types, and 10 or more types.

The amount of the compound represented by the general formula (L) contained in the liquid crystal composition depends on the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, the burn-in, the dielectric property. It is appropriately adjusted according to the required performance such as rate anisotropy.
Its preferable lower limit is 1% by mass, 10% by mass, 20% by mass, 30% by mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, It is 80 mass %. On the other hand, the preferable upper limit values are 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, 35% by mass and 25% by mass.

When it is necessary to keep the viscosity of the liquid crystal composition low and increase the response speed, it is preferable that the lower limit value and the upper limit value are high. Further, when it is necessary to keep the Tni of the liquid crystal composition high and to improve the temperature stability, it is preferable that the lower limit value and the upper limit value are high. Further, when it is desired to increase the dielectric anisotropy of the liquid crystal composition in order to keep it low, the lower limit and the upper limit are preferably low.
When reliability is important, both R ^L1 and R ^L2 are preferably alkyl groups, and when importance is attached to reducing volatility, both R ^L1 and R ^L2 are alkoxy groups. It is preferable that, when importance is attached to reduction of viscosity of the liquid crystal composition, at least one of R ^L1 and R ^L2 is an alkenyl group.
The number of halogen atoms present in the molecule is preferably 0, 1, 2 or 3, more preferably 0 or 1, and when importance is attached to compatibility with other liquid crystal molecules, It is more preferable that the number is one.

R ^L1 and R ^L2 , when they are bonded to a ring structure which is a benzene ring (aromatic ring), are a linear alkyl group having 1 to 5 carbon atoms and a linear carbon atom having 1 to 1 carbon atoms. It is preferably an alkoxy group having 4 or an alkenyl group having 4 to 5 carbon atoms, and when they are bonded to a saturated ring structure such as a cyclohexane ring, a pyran ring or a dioxane ring, a linear carbon atom. It is preferably an alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms or a linear alkenyl group having 2 to 5 carbon atoms. In order to stabilize the nematic phase, the number of carbon atoms (when oxygen atoms are included, the total number of carbon atoms and oxygen atoms) is preferably 5 or less, and linear Is also preferable.

各式中の黒点は、環構造中の炭素原子を表す。
ｎ^Ｌ１は、応答速度を重視する場合には０であることが好ましく、ネマチック相の上限温度を改善するためには２又は３であることが好ましく、これらのバランスをとるためには１であることが好ましい。また、液晶組成物として求められる特性を満たすためには、ｎ^Ｌ１が異なる値である複数種類の一般式（Ｌ）で表される化合物を併用することが好ましい。 The alkenyl group is preferably selected from the groups represented by any of the following formulas (R1) to (R5).

The black dots in each formula represent carbon atoms in the ring structure.
n ^L1 is preferably 0 when the response speed is important, is preferably 2 or 3 in order to improve the maximum temperature of the nematic phase, and is 1 in order to balance these. It is preferable. Further, in order to satisfy the properties required for the liquid crystal composition, it is preferable to use a plurality of types of compounds represented by the general formula (L) having different values of n ^L1 together.

A ^L1 , A ^L2, and A ^L3 are each independently preferably aromatic when it is required to increase Δn, and preferably aliphatic to improve the response speed. ..
Specifically, A ^L1 , A ^L2, and A ^L3 are each independently a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3 -Fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo[2.2.2]octylene group, piperidine-1 , 4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group is preferable, and More preferably, it is any of the groups represented by Chemical formula 84, and even more preferably a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

Z ^L1 and Z ^L2 are preferably single bonds when importance is attached to the response speed.
The compound represented by the general formula (L) preferably has 0 or 1 halogen atom present in the molecule.
More specifically, the compound represented by the general formula (L) is preferably selected from the compounds represented by the following general formulas (L-1) to (L-7).

式中、Ｒ^Ｌ１１及びＲ^Ｌ１２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｒ^Ｌ１１及びＲ^Ｌ１２は、それぞれ独立して、直鎖状の炭素原子数１〜５のアルキル基、直鎖状の炭素原子数１〜４のアルコキシ基又は直鎖状の炭素原子数２〜５のアルケニル基であることが好ましい。 The compound represented by formula (L-1) is the following compound.

In the formula, R ^L11 and R ^L12 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
R ^L11 and R ^L12 are each independently a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear carbon atom having 2 to 5 carbon atoms. Is preferably an alkenyl group.

The compound represented by formula (L-1) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by formula (L-1) contained in the liquid crystal composition is set as follows. That is, the preferable lower limit is 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 15% by mass, 20% by mass, 25% by mass, 30% by mass, 35% by mass. %, 40 mass %, 45 mass %, 50 mass %, 55 mass %. On the other hand, the preferable upper limit values are 95% by mass, 90% by mass, 85% by mass, 80% by mass, 75% by mass, 70% by mass, 65% by mass, 60% by mass, 55% by mass, 50% by mass, 45% by mass. %, 40 mass %, 35 mass %, 30 mass %, 25 mass %.
When it is necessary to keep the viscosity of the liquid crystal composition low and increase the response speed, it is preferable that the lower limit value and the upper limit value are high. Further, when it is necessary to keep the Tni of the liquid crystal composition high and enhance the temperature stability, it is preferable that the lower limit value is moderate and the upper limit value is moderate. Further, when it is desired to increase the dielectric anisotropy of the liquid crystal composition in order to keep it low, the lower limit and the upper limit are preferably low.

式中、Ｒ^Ｌ１２は、一般式（Ｌ−１）におけるＲ^Ｌ１２と同じ意味を表す。 The compound represented by General Formula (L-1) is preferably selected from the compounds represented by General Formula (L-1-1).

In the formula, R ^L12 has the same meaning as R ^L12 in formula (L-1).

The compound represented by formula (L-1-1) is preferably selected from compounds represented by formulas (L-1-1.1) to (L-1-1.3), L-1-1.2) and a compound represented by formula (L-1-1.3) are more preferable, and a compound represented by formula (L-1-1.3) Is more preferable.

The amount of the compound represented by formula (L-1-1.3) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass and 10% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass and 3% by mass.

式中、Ｒ^Ｌ１２は、一般式（Ｌ−１）におけるＲ^Ｌ１２と同じ意味を表す。 The compound represented by General Formula (L-1) is preferably selected from the compounds represented by General Formula (L-1-2).

In the formula, R ^L12 has the same meaning as R ^L12 in formula (L-1).

The amount of the compound represented by formula (L-1-2) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 27% by mass, 30% by mass, 35% by mass. %. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass and 30% by mass.

Further, the compound represented by the general formula (L-1-2) is preferably selected from compounds represented by the formulas (L-1-2.1) to (L-1-2.4), More preferably, it is selected from the compounds represented by formulas (L-1-2.2) to (L-1-2.4).
In particular, the compound represented by the formula (L-1-2.2) is preferable because it particularly improves the response speed of the liquid crystal composition. Moreover, when obtaining Tni higher than a response speed, it is preferable to use the compound represented by Formula (L-1-2.3) or Formula (L-1-2.4). Note that the total amount of the compound represented by the formula (L-1-2.3) and the compound represented by the formula (L-1-2.4) contained in the liquid crystal composition is the solubility at low temperature. In order to improve the content, it is not preferable to set the content to 30% by mass or more.

The amount of the compound represented by the formula (L-1-2.2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 10% by mass, 15% by mass, 18% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass, 35% by mass, 38% by mass. % And 40% by mass. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, 40% by mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass. %, 25% by mass, and 22% by mass.
The total amount of the compound represented by Formula (L-1-1.3) and the compound represented by Formula (L-1-2.2) contained in the liquid crystal composition is as follows. Is preferred. That is, the preferable lower limit values are 10% by mass, 15% by mass, 20% by mass, 25% by mass, 27% by mass, 30% by mass, 35% by mass, and 40% by mass. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, 40% by mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass. %, 25% by mass, and 22% by mass.

式中、Ｒ^Ｌ１３及びＲ^Ｌ１４は、それぞれ独立して、炭素原子数１〜８のアルキル基又は炭素原子数１〜８のアルコキシ基を表す。
Ｒ^Ｌ１３及びＲ^Ｌ１４は、それぞれ独立して、直鎖状の炭素原子数１〜５のアルキル基、直鎖状の炭素原子数１〜４のアルコキシ基又は直鎖状の炭素原子数２〜５のアルケニル基であることが好ましい。 The compound represented by General Formula (L-1) is preferably selected from the compounds represented by General Formula (L-1-3).

In the formula, R ^L13 and R ^L14 each independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.
R ^L13 and R ^L14 are each independently a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear chain having 2 to 5 carbon atoms. Is preferably an alkenyl group.

The amount of the compound represented by formula (L-1-3) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass and 30% by mass. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 40% by mass, 37% by mass, 35% by mass, 33% by mass, 30% by mass, 27% by mass, 25% by mass. %, 23 mass %, 20 mass %, 17 mass %, 15 mass %, 13 mass %, and 10 mass %.

Further, the compound represented by the general formula (L-1-3) is preferably selected from compounds represented by the formulas (L-1-3.1) to (L-1-3.13), More preferably, it is selected from the compounds represented by formula (L-1-3.1), formula (L-1-3.3) and formula (L-1-3.4).
In particular, the compound represented by the formula (L-1-3.1) is preferable because it particularly improves the response speed of the liquid crystal composition. Further, when obtaining Tni higher than the response speed, the formula (L-1-3.3), the formula (L-1-3.4), the formula (L-1-3.11) or the formula (L- It is preferable to use the compound represented by 1-3.12). Note that the compound represented by the formula (L-1-3.3), the compound represented by the formula (L-1-3.4), and the compound represented by the formula (L-1-3) contained in the liquid crystal composition. The total amount of the compound represented by Formula (11.11) and the compound represented by Formula (L-1-3.13) is preferably 20% by mass or more in order to improve the solubility at low temperature. Absent.

The amount of the compound represented by the formula (L-1-3.1) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass and 20% by mass. On the other hand, the preferable upper limit values are 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass and 6% by mass.

式中、Ｒ^Ｌ１５及びＲ^Ｌ１６は、それぞれ独立して、炭素原子数１〜８のアルキル基又は炭素原子数１〜８のアルコキシ基を表す。
Ｒ^Ｌ１５及びＲ^Ｌ１６は、それぞれ独立して、直鎖状の炭素原子数１〜５のアルキル基、直鎖状の炭素原子数１〜４のアルコキシ基又は直鎖状の炭素原子数２〜５のアルケニル基であることが好ましい。 The compound represented by General Formula (L-1) is preferably selected from the compounds represented by General Formula (L-1-4) and General Formula (L-1-5).

In the formula, R ^L15 and R ^L16 each independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.
R ^L15 and R ^L16 are each independently a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear carbon atom having 2 to 5 carbon atoms. Is preferably an alkenyl group.

The amount of the compound represented by formula (L-1-4) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, 13% by mass and 10% by mass.
The amount of the compound represented by formula (L-1-5) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, 13% by mass and 10% by mass.

Furthermore, the compounds represented by formulas (L-1-4) and (L-1-5) are represented by formulas (L-1-4.1) to (L-1-5.3). The compound is preferably selected from compounds, and more preferably selected from the compounds represented by formula (L-1-4.2) and formula (L-1-5.2).

The amount of the compound represented by the formula (L-1-4.2) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass and 20% by mass. On the other hand, the preferable upper limit values are 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass and 6% by mass.

Formula (L-1-1.3), Formula (L-1-2.2), Formula (L-1-3.1), Formula (L-1-3.3), Formula (L-1-) 3.4), two or more kinds selected from the compounds represented by the formula (L-1-3.11) and the formula (L-1-3.12), or the formula (L-1-1) .3), formula (L-1-2.2), formula (L-1-3.1), formula (L-1-3.3), formula (L-1-3.4), and formula (L-1-3.4). It is also preferable to use two or more compounds selected from the compounds represented by L-1-4.2) in combination.
The total amount of these compounds contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass, 20% by mass, and 23% by mass. %, 25 mass %, 27 mass %, 30 mass %, 33 mass %, 35 mass %. On the other hand, the preferable upper limit values are 80% by mass, 70% by mass, 60% by mass, 50% by mass, 45% by mass, 40% by mass, 37% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass. %, 25% by mass, 23% by mass, and 20% by mass.

When importance is placed on the reliability of the liquid crystal composition, the compounds represented by formula (L-1-3.1), formula (L-1-3.3) and formula (L-1-3.4) It is preferable to use two or more selected from the following, and when importance is attached to the response speed of the liquid crystal composition, it is represented by formula (L-1-1.3) and formula (L-1-2.2). It is preferable to use two or more compounds selected from the following compounds in combination.

式中、Ｒ^Ｌ１７及びＲ^Ｌ１８は、それぞれ独立して、メチル基又は水素原子を表す。
液晶組成物中に含まれる一般式（Ｌ−１−６）で表される化合物の量は、次の通りであることが好ましい。すなわち、その好ましい下限値は、１質量％、５質量％、１０質量％、１５質量％、１７質量％、２０質量％、２３質量％、２５質量％、２７質量％、３０質量％、３５質量％である。一方、その好ましい上限値は、６０質量％、５５質量％、５０質量％、４５質量％、４２質量％、４０質量％、３８質量％、３５質量％、３３質量％、３０質量％である。 The compound represented by General Formula (L-1) is preferably selected from the compounds represented by General Formula (L-1-6).

In the formula, R ^L17 and R ^L18 each independently represent a methyl group or a hydrogen atom.
The amount of the compound represented by formula (L-1-6) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 5% by mass, 10% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 27% by mass, 30% by mass, 35% by mass. %. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass and 30% by mass.

Further, the compound represented by the general formula (L-1-6) is preferably selected from the compounds represented by the formulas (L-1-6.1) to (L-1-6.3).

式中、Ｒ^Ｌ２１及びＲ^Ｌ２２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｒ^Ｌ２１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましい。
Ｒ^Ｌ２２は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましい。 The compound represented by formula (L-2) is the following compound.

In the formula, R ^L21 and R ^L22 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
R ^L21 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
R ^L22 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compound represented by formula (L-2) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by formula (L-2) contained in the liquid crystal composition is high when the solubility at low temperature is important, and the effect is high. On the contrary, the response speed is important. In this case, setting it lower will be more effective. Further, in the case of improving the drop mark and the image sticking property, it is preferable to set the range of the amount to the middle.
The preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass and 10% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass and 3% by mass.

Further, the compound represented by the general formula (L-2) is preferably selected from compounds represented by the formulas (L-2.1) to (L-2.6), and the compound represented by the formula (L-2. 1), the formula (L-2.3), the formula (L-2.4) and the compound represented by the formula (L-2.6) are more preferable.

式中、Ｒ^Ｌ３１及びＲ^Ｌ３２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｒ^Ｌ３１及びＲ^Ｌ３２は、それぞれ独立して、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましい。
一般式（Ｌ−３）で表される化合物は、１種類を単独で使用することも、２種類以上を併用することもできる。
併用可能な化合物の種類は、特に制限されないが、低温での溶解性、転移温度、電気的な信頼性、複屈折率などの求められる性能に応じて、適宜選択される。
使用する化合物の種類は、例えば本発明の一つの実施形態では、１種類であり、２種類であり、３種類であり、４種類であり、５種類以上である。 The compound represented by formula (L-3) is the following compound.

In the formula, R ^L31 and R ^L32 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
R ^L31 and R ^L32 are preferably each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
The compound represented by formula (L-3) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by formula (L-3) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass and 10% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass and 3% by mass.
The amount of the compound represented by the general formula (L-3) contained in the liquid crystal composition is high if a high birefringence is obtained, and on the contrary, if a high Tni is important. Is effective when set to a low value. Further, in the case of improving the drop mark and the burn-in property, it is preferable to set the range of the amount to the middle.

Further, the compound represented by the general formula (L-3) is preferably selected from compounds represented by the formulas (L-3.1) to (L-3.7), and the compound represented by the formula (L-3. More preferably, it is selected from the compounds represented by 2) to (L-3.5).

式中、Ｒ^Ｌ４１及びＲ^Ｌ４２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｒ^Ｌ４１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましい。
Ｒ^Ｌ４２は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましい。 The compound represented by formula (L-4) is the following compound.

In the formula, R ^L41 and R ^L42 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
R ^L41 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
R ^L42 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compound represented by the general formula (L-4) can be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (L-4) contained in the liquid crystal composition depends on the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, and the burn-in. , The dielectric anisotropy and the like are appropriately adjusted.
The preferable lower limit value is 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass, It is 30 mass %, 35 mass %, and 40 mass %. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass and 5% by mass.

Furthermore, the compound represented by formula (L-4) is preferably selected from the compounds represented by formulas (L-4.1) to (L-4.3).

The liquid crystal composition may contain a compound represented by the formula (L-4.1) depending on required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The compound represented by the formula (L-4.2) may be contained, or the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2). Both the compound and the compound may be contained, or all the compounds represented by the formulas (L-4.1) to (L-4.3) may be contained.

The amount of the compound represented by formula (L-4.1) or formula (L-4.2) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 3% by mass, 5% by mass, 7% by mass, 9% by mass, 11% by mass, 12% by mass, 13% by mass, 18% by mass, and 21% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 10% by mass. % And 8% by mass.
When the liquid crystal composition contains both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2), they are included in the liquid crystal composition. The total amount is preferably as follows. That is, the preferable lower limit values are 15% by mass, 19% by mass, 24% by mass, and 30% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

The compound represented by the general formula (L-4) is preferably selected from compounds represented by the formulas (L-4.4) to (L-4.6), and the compound represented by the formula (L-4. The compound represented by 4) is more preferable.

The liquid crystal composition may contain a compound represented by the formula (L-4.4) depending on required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. Of course, the compound represented by the formula (L-4.5) may be contained, and the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5). Both may be included.

The amount of the compound represented by formula (L-4.4) or formula (L-4.5) in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 3% by mass, 5% by mass, 7% by mass, 9% by mass, 11% by mass, 12% by mass, 13% by mass, 18% by mass, and 21% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 10% by mass. % And 8% by mass.
When the liquid crystal composition contains both the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5), it is included in these liquid crystal compositions. The total amount is preferably as follows. That is, the preferable lower limit values are 15% by mass, 19% by mass, 24% by mass, and 30% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass and 13% by mass.

Further, the compound represented by the general formula (L-4) is preferably selected from compounds represented by the formulas (L-4.7) to (L-4.10), and particularly, the compound represented by the formula (L- It is preferably a compound represented by 4.9).

式中、Ｒ^Ｌ５１及びＲ^Ｌ５２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｒ^Ｌ５１は、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましい。
Ｒ^Ｌ５２は、炭素原子数１〜５のアルキル基、炭素原子数４〜５のアルケニル基又は炭素原子数１〜４のアルコキシ基であることが好ましい。 The compound represented by formula (L-5) is the following compound.

In the formula, R ^L51 and R ^L52 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
R ^L51 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
R ^L52 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compound represented by formula (L-5) may be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.

The amount of the compound represented by the general formula (L-5) contained in the liquid crystal composition depends on the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, and the burn-in. , The dielectric anisotropy and the like are appropriately adjusted.
The preferable lower limit value is 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass, It is 30 mass %, 35 mass %, and 40 mass %. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass and 5% by mass.

Further, the compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.1) or the formula (L-5.2), and particularly, the compound represented by the formula (L- It is preferably a compound represented by 5.1).
The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass and 9% by mass.

Further, the compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.3) or the formula (L-5.4).
The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass and 9% by mass.

Further, the compound represented by the general formula (L-5) is preferably selected from compounds represented by the formulas (L-5.5) to (L-5.7), and particularly, the compound represented by the formula (L- It is preferably a compound represented by 5.7).
The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass and 9% by mass.

式中、Ｒ^Ｌ６１及びＲ^Ｌ６２は、それぞれ独立して、一般式（Ｌ）におけるＲ^Ｌ１及びＲ^Ｌ２と同じ意味を表す。
Ｘ^Ｌ６１及びＸ^Ｌ６２は、それぞれ独立して、水素原子又はフッ素原子を表す。
Ｒ^Ｌ６１及びＲ^Ｌ６２は、それぞれ独立して、炭素原子数１〜５のアルキル基又は炭素原子数２〜５のアルケニル基であることが好ましい。
Ｘ^Ｌ６１及びＸ^Ｌ６２のうちの一方がフッ素原子であり、他方が水素原子であることが好ましい。 The compound represented by formula (L-6) is the following compound.

In the formula, R ^L61 and R ^L62 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).
X ^L61 and X ^L62 each independently represent a hydrogen atom or a fluorine atom.
R ^L61 and R ^L62 are preferably each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.
It is preferable that one of X ^L61 and X ^L62 is a fluorine atom and the other is a hydrogen atom.

The compound represented by formula (L-6) can be used alone or in combination of two or more.
The type of compound that can be used in combination is not particularly limited, but is appropriately selected according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The types of compounds used are, for example, in one embodiment of the present invention, one type, two types, three types, four types, and five or more types.
The amount of the compound represented by formula (L-6) contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit value is 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass. %, 30% by mass, 35% by mass, and 40% by mass. On the other hand, the preferable upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass and 5% by mass. The amount of the compound represented by the general formula (L-6) is preferably increased when the emphasis is placed on increasing Δn, and is smaller when the emphasis is on precipitation at low temperature. preferable.

Further, the compound represented by the general formula (L-6) is preferably selected from the compounds represented by the formulas (L-6.1) to (L-6.9).

The type of compound that can be used in combination is not particularly limited, but it is preferable to select 1 to 3 types from the compounds represented by formulas (L-6.1) to (L-6.9), and 1 to 4 It is more preferable to select the type.
In addition, the fact that the compound to be used in combination has a wide molecular weight distribution is also effective for solubility. Therefore, for example, one of the compounds represented by formula (L-6.1) and formula (L-6.2) is selected. , One of the compounds represented by formula (L-6.4) and formula (L-6.5) and represented by formula (L-6.6) and formula (L-6.7). It is preferable to select one kind from the compounds represented by the formula (L-6.8) and the compound represented by the formula (L-6.9) and to combine them appropriately.
Among them, they are represented by formula (L-6.1), formula (L-6.3), formula (L-6.4), formula (L-6.6) and formula (L-6.9). It is preferable to include a compound.

Further, the compound represented by the general formula (L-6) is preferably selected from the compounds represented by the formulas (L-6.10) to (L-6.17), and the compound represented by the formula (L-6. The compound represented by 11) is more preferable.

The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass and 9% by mass.

The liquid crystal composition as described above preferably does not contain a compound having a structure in which oxygen atoms are bonded to each other such as a peracid (—CO—OO—) structure in the molecule.
When the reliability and long-term stability of the liquid crystal composition are emphasized, the amount of the compound having a carbonyl group contained in the liquid crystal composition is preferably 5% by mass or less, and 3% by mass or less. Is more preferable, 1% by mass or less is more preferable, and substantially 0 (zero)% by mass is most preferable.
When importance is attached to the stability by UV irradiation, the amount of the compound substituted with a chlorine atom in the liquid crystal composition is preferably 15% by mass or less, more preferably 10% by mass or less, It is more preferably 8% by mass or less, further preferably 5% by mass or less, particularly preferably 3% by mass or less, and most preferably substantially 0 (zero)% by mass.

Further, it is preferable to increase the amount of the compound having a 6-membered ring structure in the molecule contained in the liquid crystal composition, specifically, 80% by mass or more, and 90% by mass or more. More preferably, it is more preferably 95 mass% or more, and most preferably substantially 100 mass %.
In order to prevent or suppress the deterioration of the liquid crystal composition due to oxidation, it is preferable to reduce the amount of the compound having a cyclohexene ring as a ring structure contained in the liquid crystal composition, specifically 10% by mass or less. It is preferable that the amount is 8% by mass or less, more preferably 5% by mass or less, particularly preferably 3% by mass or less, and substantially 0 (zero)% by mass. Most preferred.

Furthermore, in order to prevent or suppress the deterioration of the liquid crystal composition due to oxidation, it is preferable to reduce the amount of the compound having —CH═CH— as a linking group contained in the liquid crystal composition. It is preferably not more than 5% by mass, more preferably not more than 5% by mass, and further preferably substantially 0 (zero)% by mass.
When it is important to improve the viscosity (η) of the liquid crystal composition and the nematic phase-isotropic liquid phase transition temperature (Tni), a hydrogen atom may be replaced with a halogen atom. It is preferable to reduce the amount of the compound having a methylbenzene-1,4-diyl group in the molecule contained in the liquid crystal composition. Specifically, it is preferably 10% by mass or less, and 5% by mass or less. Is more preferable, and it is even more preferable that the amount is substantially 0 (zero) mass %.

When the compound (liquid crystal molecule or the like) contained in the liquid crystal composition has a cyclohexylene group to which an alkenyl group is bonded as a side chain, the alkenyl group preferably has 2 to 5 carbon atoms. When the compound contained in the liquid crystal composition has a phenylene group having an alkenyl group bonded as a side chain, the alkenyl group preferably has 4 to 5 carbon atoms, and the alkenyl group has It is preferable that the saturated bond and the phenylene group are not directly bonded.
Further, when importance is attached to the stability of the liquid crystal composition, the amount of the compound having an alkenyl group as a side chain and having a 2,3-difluorobenzene-1,4-diyl group in the liquid crystal composition Is preferably less than 10% by mass, more preferably not more than 5% by mass, even more preferably substantially 0 (zero)% by mass.

The average elastic constant ( _KAVG ) of the liquid crystal composition is preferably 10 to 25. However, the preferable lower limit value is 10, 10.5, 11, 11.5, 12, 12.3, 12.5, 12.8, 13, 13.3, 13.5, 13.8, 14, 14.3, 14.5, 14.8, 15, 15.3, 15.5, 15.8, 16, 16.3, 16.5, 16.8, 17, 17.3, 17.5, 17.8 and 18. On the other hand, the preferable upper limit values are 25, 24.5, 24, 23.5, 23, 22.8, 22.5, 22.3, 22, 21.8, 21.5, 21.3, 21, 20.8, 20.5, 20.3, 20, 19.8, 19.5, 19.3, 19, 18.8, 18.5, 18.3, 18, 17.8, 17.5, 17.3 and 17.

When importance is attached to reduction of power consumption, it is effective to suppress the light amount of the backlight, and therefore it is preferable to improve the light transmittance of the liquid crystal display element 1. Therefore, it is preferable to set the value of K _AVG to be low. When emphasis is placed on improving the response speed, it is preferable to set a high value of K _AVG .
The value of the refractive index anisotropy (Δn) (hereinafter, simply referred to as “refractive index anisotropy”) at 25° C. of the liquid crystal composition is preferably about 0.08 to 0.13, and a value of 0. It is more preferably about 09 to 0.12.
The rotational viscosity (γ1) of the liquid crystal composition at 25° C. (hereinafter, also simply referred to as “rotational viscosity”) is preferably less than 165 mPa·s, more preferably about 80 to 145 mPa·s, and about 90 to 130 mPa·s. More preferable. By using the liquid crystal composition having such a rotational viscosity, it is possible to prevent the response speed of the liquid crystal layer (liquid crystal display element) from decreasing.

式中、γ１は、回転粘度を表し、Δｎは、屈折率異方性を表す。
Ｚは、１３，０００ｍＰａ・ｓ以下であることが好ましく、１２，０００ｍＰａ・ｓ以下であることがより好ましく、１１，０００ｍＰａ・ｓ以下であることがさらに好ましい。 Further, in the liquid crystal composition, it is preferable that Z, which is a function of the rotational viscosity and the value of the refractive index anisotropy, shows a specific value.

In the formula, γ1 represents rotational viscosity, and Δn represents refractive index anisotropy.
Z is preferably 13,000 mPa·s or less, more preferably 12,000 mPa·s or less, and further preferably 11,000 mPa·s or less.

The nematic phase-isotropic liquid phase transition temperature (Tni) of the liquid crystal composition is preferably 60°C or higher, more preferably 75°C or higher, and further preferably 80°C or higher. By using the liquid crystal composition having such Tni, it is possible to obtain a liquid crystal layer (liquid crystal display element) that can be stably driven in the temperature range in which it is actually used.
The specific resistance of the liquid crystal composition is preferably 10 ¹² Ω·cm or more, more preferably 10 ¹³ Ω·cm or more, and further preferably 10 ¹⁴ Ω·cm or more.
The absolute value of the dielectric anisotropy (Δε) of the liquid crystal composition at 25° C. is preferably about 2.5 to 5, more preferably about 2.6 to 4.5, and 2.7. It is more preferably about 4 to 4, and particularly preferably about 2.8 to 3.5. By using the liquid crystal composition having such a dielectric anisotropy, the liquid crystal layer (liquid crystal display element) can be driven at a lower voltage.

The liquid crystal composition described above is, in addition to the above liquid crystal molecules, other compounds (molecules) such as ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, and ultraviolet absorbers, depending on the application. May be included.
However, when the chemical stability of the liquid crystal composition is required, it is preferable that the other compound does not have a chlorine atom in its structure. When stability of the liquid crystal composition against light such as ultraviolet rays is required, other compounds include condensed rings having a long conjugation length represented by a naphthalene ring or the like in the structure and an absorption peak in the ultraviolet region. It is preferable not to have.

The liquid crystal composition of the present invention contains a liquid crystal mixture containing a plurality of the above liquid crystal molecules and an alignment aid. In the present invention, the difference between the solubility parameter (SP value) of the liquid crystal mixture and the solubility parameter (SP value) of the alignment aid (hereinafter referred to as “SP value difference”) is 17 or less. Characterize.
Here, the solubility parameter is a value defined by the regular solution theory introduced by Hildebrandt, and can be theoretically calculated from the chemical formula by the Small calculation method. More specifically, the solubility parameter is a value used to represent a measure of compatibility between two materials, materials having similar solubility parameters are easily mixed, and materials having different solubility parameters are mixed. hard.

When the SP value difference exceeds 17, the compatibility between the liquid crystal mixture and the alignment aid is extremely low, and in the liquid crystal composition obtained by mixing these, the alignment aid is precipitated in a short period of time during storage. That is, such a liquid crystal composition has poor storage stability.
On the other hand, in the present invention, the compatibility is sufficiently high by using the liquid crystal mixture having an SP value difference of 17 or less and the alignment aid in combination. Therefore, the liquid crystal composition of the present invention does not easily deposit the alignment aid even after being stored for a long period of time and is excellent in storage stability.
The SP value difference may be 17 or less, more preferably 13 or less, further preferably 10 or less, and particularly preferably 8 or less. When the SP value difference is within the above range, the compatibility between the liquid crystal mixture and the alignment aid can be further increased.

The lower limit of the SP value difference is preferably more than 2, more preferably 2.1 or more, and further preferably 2.2 or more. When the SP value difference is within the above range, it means that the polarity of the alignment aid is not extremely low, and the adsorption force of the alignment aid (adsorption group) on the adsorbent medium is sufficiently maintained. Therefore, the alignment aid exhibits a good alignment regulating force for the liquid crystal molecules.
When the SP value difference is more than 2 and less than 4, it is particularly preferable in terms of excellent pretilt stability. Further, when the SP value difference is 4 or more and 17 or less, it is particularly preferable in that the vertical alignment property is excellent.
The adsorptive group is preferably a group selected from a cyclic group containing an oxygen atom and a chain group containing an oxygen atom, and is —OH, —OC(═O)C(═O)O—X ^at1. (X ^at1 has the same meaning as described above) or a cyclic group containing a carbonate structure is more preferable, and a cyclic group containing -OH or a carbonate structure is more preferable. These adsorbing groups have a high adsorbing power for the adsorbent, and therefore the alignment aid exhibits a good alignment regulating force for the liquid crystal molecules. Further, in the manufacturing process of the liquid crystal display element described later, a good display can be obtained without generating a drop mark by a drop injection (ODF: One Drop Fill) method in the assembly process.

Further, the number of adsorbing groups may be one or more, and more preferably one or two. The alignment aid having one or two adsorbing groups has an appropriate adsorbing power for the adsorbent, and easily adjusts the SP value difference with the liquid crystal mixture to an appropriate value. Therefore, when the liquid crystal composition is supplied to the adsorbent, the alignment aid is satisfactorily wet and spread on the adsorbent without being left behind in the flow of the liquid crystal composition. As a result, the liquid crystal molecules can be uniformly vertically aligned in each area of the surface of the adsorbent. In addition, in the liquid crystal display device manufacturing process described later, in the drop injection (ODF: One Drop Fill) method in the assembling process, the alignment aid is uniformly adsorbed on the adsorbent, so that no drop mark is generated. , A good display can be obtained.
The alignment aid may not have a polymerizable group, but preferably has at least one polymerizable group. In this case, by forming a polymer of the alignment aid, the alignment regulating force for the liquid crystal molecules can be further improved.

The amount of the alignment aid contained in the liquid crystal composition is preferably about 0.01 to 10% by mass. The more preferable lower limit values thereof are 0.05% by mass and 0.1% by mass from the viewpoint of aligning the liquid crystal molecules more preferably. On the other hand, the more preferable upper limit value thereof is 7% by mass, 5% by mass, 4% by mass, 3% by mass, and 1% by mass from the viewpoint of improving response characteristics. By adjusting the SP value difference within the above range, a sufficient amount of the alignment aid can be dissolved in the liquid crystal mixture while maintaining the high affinity of the alignment aid to the adsorbent.

(Liquid crystal display element)
The liquid crystal composition of the present invention is used for forming a liquid crystal layer of a liquid crystal display device. Hereinafter, the liquid crystal display element according to the present embodiment will be described with reference to FIGS.
1 is an exploded perspective view schematically showing an embodiment of a liquid crystal display element, and FIG. 2 is an enlarged plan view of a region surrounded by I line in FIG.
Note that, in FIGS. 1 and 2, for convenience, dimensions and ratios thereof are exaggerated and may be different from actual ones. In addition, the materials, dimensions, and the like shown below are examples, and the present invention is not limited to these, and can be appropriately modified within the scope of the invention.

The liquid crystal display element 1 shown in FIG. 1 includes an active matrix substrate AM and a color filter substrate CF which are arranged to face each other, and a liquid crystal layer 4 which is sandwiched between the active matrix substrate AM and the color filter substrate CF. ing.
The active matrix substrate AM includes the first substrate 2, the pixel electrode layer 5 provided on the surface of the first substrate 2 on the liquid crystal layer 4 side, and the surface of the first substrate 2 on the opposite side of the liquid crystal layer 4. It has the 1st polarizing plate 7 provided.

On the other hand, the color filter substrate CF is formed on the second substrate 3, the common electrode layer 6 provided on the liquid crystal layer 4 side of the second substrate 3, and the surface of the second substrate 3 opposite to the liquid crystal layer 4. It has a second polarizing plate 8 provided and a color filter 9 provided between the second substrate 3 and the common electrode layer 6.
The liquid crystal layer 4 is a vertical alignment type using negative dielectric anisotropy, and in the liquid crystal layer 4, liquid crystal molecules are applied to the substrates AM and CF in a state where no voltage is applied between the electrode layers 5 and 6. Align almost vertically.

That is, the liquid crystal display element 1 according to the present embodiment includes the first polarizing plate 7, the first substrate 2, the pixel electrode layer 5, the liquid crystal layer 4, the common electrode layer 6, the color filter 9, The second substrate 3 and the second polarizing plate 8 are laminated in this order.
The first substrate 2 and the second substrate 3 are each formed of a material having flexibility such as a glass material or a plastic material.
Both of the first substrate 2 and the second substrate 3 may have a light-transmitting property, or only one of them may have a light-transmitting property. In the latter case, the other substrate may be composed of an opaque material such as a metallic material or a silicon material.

As shown in FIG. 2, the pixel electrode layer 5 includes a plurality of gate bus lines 11 for supplying a scanning signal, a plurality of data bus lines 12 for supplying a display signal, and a plurality of pixel electrodes 13. Have Note that FIG. 2 shows a pair of gate bus lines 11 and 11 and a pair of data bus lines 12 and 12.
The plurality of gate bus lines 11 and the plurality of data bus lines 12 are arranged in a matrix so as to intersect with each other, and the region surrounded by these forms a unit pixel of the liquid crystal display element 1. One pixel electrode 13 is formed in each unit pixel. Each pixel may be composed of a plurality of sub-pixels.

The pixel electrode 13 includes, for example, two trunk portions that are orthogonal to each other and have a cross shape, and a plurality of branch portions that branch from each trunk portion and that are inclined at an angle of approximately 45° with respect to each trunk portion (so-called). Fishbone structure). In other words, the pixel electrode 13 can also be regarded as an electrode having a structure having a slit formed between the branch portions.
According to the pixel electrode 13 having such a structure, the liquid crystal molecules are inclined and aligned in the four directions in which the branches are inclined with respect to the trunk. Therefore, a domain divided into four is formed in one pixel, and the viewing angle of the liquid crystal display element 1 can be widened.

The width L of each branch is preferably about 1 to 5 μm, and more preferably about 2 to 4 μm. The distance S between adjacent branch portions is preferably about 1 to 5 μm, more preferably about 2 to 4 μm. With such a configuration, the liquid crystal molecules can be more surely tilted and aligned in a predetermined direction.
A Cs electrode 14 is provided between the pair of gate bus lines 11 in parallel with the gate bus line 11. Further, a thin film transistor including a source electrode 15 and a drain electrode 16 is provided in the vicinity of an intersection where the gate bus line 11 and the data bus line 12 intersect each other. A contact hole 17 is provided in the drain electrode 16.

The gate bus line 11 and the data bus line 12 are preferably formed of, for example, Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni or an alloy containing these, and Mo, Al or More preferably, it is formed of an alloy containing these.
The pixel electrode 13 is composed of, for example, a transparent electrode in order to improve the light transmittance. The transparent electrode is formed by sputtering a compound such as ZnO, InGaZnO, SiGe, GaAs, IZO (Indium Zinc Oxide), ITO (Indium Tin Oxide), SnO, TiO, AZTO (AlZnSnO).
The average thickness of the transparent electrode is preferably about 10 to 200 nm. Further, in order to reduce electric resistance, a transparent electrode can be formed as a polycrystalline ITO film by baking an amorphous ITO film.

On the other hand, the common electrode layer 6 has, for example, a plurality of stripe-shaped common electrodes (transparent electrodes) that are provided side by side. This common electrode can also be formed similarly to the pixel electrode 13.
The color filter 9 can be formed by, for example, a pigment dispersion method, a printing method, an electrodeposition method, a dyeing method, or the like.
In the pigment dispersion method, a curable coloring composition for a color filter is supplied on the second substrate 3 so as to have a predetermined pattern, and then heated or irradiated with light to be cured. The color filter 9 can be obtained by performing this operation for three colors of red, green, and blue.
The color filter 9 may be arranged on the first substrate 2 side.

Further, the liquid crystal display element 1 may be provided with a black matrix (not shown) from the viewpoint of preventing light leakage. This black matrix is preferably formed in a portion corresponding to the thin film transistor.
The black matrix may be arranged on the second substrate 3 side together with the color filter 9, or may be arranged on the first substrate 2 side together with the color filter 9, and the black matrix may be arranged on the first substrate 2 side. The color filters 9 may be individually arranged on the second substrate 3 side. Further, the black matrix can also be configured by a portion in which the respective colors of the color filter 9 are overlapped and the transmittance is reduced.

The active matrix substrate AM and the color filter substrate CF are attached to each other in their peripheral regions by a sealing material (sealing material) composed of an epoxy thermosetting composition, an acrylic UV curable composition, or the like. There is.
It should be noted that a spacer may be arranged between the active matrix substrate AM and the color filter substrate CF so as to maintain a distance therebetween. Examples of the spacer include granular spacers such as glass particles, plastic particles, and alumina particles, resin spacer columns formed by a photolithography method, and the like.
The average distance between the active matrix substrate AM and the color filter substrate CF (that is, the average thickness of the liquid crystal layer 4) is preferably about 1 to 100 μm.

The first polarizing plate 7 and the second polarizing plate 8 can be designed to have a good viewing angle and contrast by adjusting the positional relationship of their transmission axes. Specifically, it is preferable that the first polarizing plate 7 and the second polarizing plate 8 are arranged so that their transmission axes are orthogonal to each other so as to operate in the normally black mode. In particular, it is preferable that one of the first polarizing plate 7 and the second polarizing plate 8 is arranged such that the transmission axis thereof is substantially 45° with the alignment direction of the liquid crystal molecules when a voltage is applied. ..

When the first polarizing plate 7 and the second polarizing plate 8 are used, the product of the refractive index anisotropy (Δn) of the liquid crystal layer 4 and the average thickness of the liquid crystal layer 4 so that the contrast becomes maximum. Is preferably adjusted. Furthermore, the liquid crystal display element 1 may include a retardation film for widening the viewing angle.
In the liquid crystal display element 1, an alignment film such as a polyimide alignment film is provided on the liquid crystal layer 4 side of at least one of the active matrix substrate AM and the color filter substrate CF so as to be in contact with the liquid crystal layer 4. it can. In other words, in the present invention, by using the liquid crystal composition as described above, at least one of the active matrix substrate AM and the color filter substrate CF may not have the alignment film.

(Method of manufacturing liquid crystal display element)
Next, a method of manufacturing such a liquid crystal display element 1 will be described.
The method for manufacturing a liquid crystal display element of the present embodiment includes a preparatory step [1] for preparing a substrate and a liquid crystal composition, an assembly step [2] for assembling each part, and at least one of an alignment aid and a polymerizable compound. And a polymerization step [3] for polymerizing.
[1] Preparation Step First, the active matrix substrate AM, the color filter substrate CF, and the liquid crystal composition as described above are prepared.

[2] Assembly Step Next, the seal material is drawn in a closed-loop bank shape using a dispenser along at least one edge of the active matrix substrate AM and the color filter substrate CF.
After that, a predetermined amount of the liquid crystal composition is dropped inside the sealing material, and then the active matrix substrate AM and the color filter substrate CF are arranged to face each other so as to contact the liquid crystal composition under reduced pressure.
In such a drop injection (ODF: One Drop Fill) method, it is necessary to drop an optimum injection amount according to the size of the liquid crystal display element 1. The liquid crystal composition as described above has little influence on, for example, a sudden pressure change or impact in the dropping device that occurs at the time of dropping, and it is possible to continue dropping stably for a long time. Therefore, the yield of the liquid crystal display element 1 can be maintained high.

Particularly in a small-sized liquid crystal display element that is often used in smartphones, it is difficult to control the deviation amount within a certain range because the optimum injection amount of the liquid crystal composition is small. However, by using the liquid crystal composition as described above, a stable and optimum injection amount can be accurately dropped even in a small liquid crystal display device.
Further, according to the ODF method, it is possible to suppress the generation of drop marks when the liquid crystal composition is dropped on the substrate. It should be noted that the drop mark is a phenomenon in which the mark on which the liquid crystal composition is dropped appears white when black is displayed.
Then, the sealing material is cured by irradiation with ultraviolet rays (active energy rays) and heating. Depending on the type of the sealing material, the sealing material may be cured by only one of ultraviolet irradiation and heating.

[3] Polymerization Step Next, at least one of the alignment aid and the polymerizable compound is polymerized by irradiating the liquid crystal composition with active energy rays such as ultraviolet rays and electron beams.
As a result, a polymer layer (a polymer of at least one of an alignment aid and a polymerizable compound) that controls liquid crystal alignment is formed at the interface of the liquid crystal layer 4, and the liquid crystal display element 1 is obtained.
In order to give a sufficient pretilt angle to liquid crystal molecules, a proper polymerization rate is desirable. Therefore, during the polymerization, it is preferable to irradiate the active energy rays singly, in combination or sequentially. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used.

When the polymerization is performed in a state where the two substrates are opposed to each other so as to contact the liquid crystal composition as in this embodiment, at least the substrate located on the irradiation surface side is suitable for the active energy ray. It must have good transparency.
Further, the polymerization may be carried out in multiple steps as follows. Specifically, first, conditions such as an electric field, a magnetic field, or temperature are adjusted to change the alignment state of liquid crystal molecules. In this state, the liquid crystal composition is irradiated with active energy rays to polymerize at least one of the alignment aid and the polymerizable compound. Next, the liquid crystal composition is irradiated with an activation energy ray without applying an electric field or a magnetic field to polymerize the remaining unpolymerized material (residual monomer).

Particularly, when ultraviolet rays are used, it is preferable to apply ultraviolet rays while applying an alternating electric field to the liquid crystal composition.
The frequency of the applied alternating current is preferably about 10 Hz to 10 kHz, and more preferably about 60 Hz to 10 kHz.
The alternating voltage to be applied is selected depending on the desired pretilt angle of the liquid crystal display element 1. That is, the pretilt angle of the liquid crystal display element 1 can be controlled by adjusting the applied AC voltage. The pretilt angle imparted to the liquid crystal molecules is preferably about 85 to 89.5°, more preferably about 87.5 to 89°. By adjusting the pretilt angle of the liquid crystal molecules in such a range, it is possible to sufficiently enhance the response speed of the liquid crystal display element 1 and prevent the deterioration of the contrast.

The temperature at which the ultraviolet rays are irradiated is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition is maintained. The specific temperature is preferably close to room temperature, that is, typically about 15 to 35°C.
A metal halide lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a fluorescent tube, or the like can be used as the lamp that generates ultraviolet rays.
Further, the ultraviolet ray to be irradiated is preferably an ultraviolet ray having a wavelength not in the absorption wavelength range of the liquid crystal composition, and it is more preferable to use by cutting a predetermined wavelength if necessary.

The intensity of the ultraviolet rays to be applied is preferably about 0.1 mW/cm ^{2 to} 100 W/cm ² , and more preferably about ² mW/cm ^{2 to} 50 W/cm ² . Note that the ultraviolet rays may be emitted while changing the intensity.
Energy of ultraviolet light irradiation, can be appropriately ^adjusted, it is more preferable is preferably 10mJ / cm ² ~500J / cm 2 about ^a 100mJ / cm ² ~200J / cm 2 approximately.
The time for irradiating the ultraviolet rays is appropriately selected depending on the intensity, but is preferably about 10 to 3600 seconds, more preferably about 10 to 600 seconds.

In the assembly process [2], a vacuum injection method may be used instead of the drop injection (ODF) method. For example, in the vacuum injection method, first, a seal material is screen-printed along the edge of at least one of the active matrix substrate AM and the color filter substrate CF while leaving the injection port. After that, the two substrates AM and CF are bonded together, and the sealing material is thermoset by heating. Next, the liquid crystal composition is injected under vacuum into the space defined by the sealing material between the two substrates AM and CF through the injection port, and then the injection port is sealed. Then, the process proceeds to [3] polymerization step.
The liquid crystal display element 1 thus obtained is preferably a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type liquid crystal display element, and more preferably a PSA type liquid crystal display element. More preferable.

Although the alignment aid, the liquid crystal composition, and the liquid crystal display element of the present invention have been described above based on the embodiments, the present invention is not limited thereto, and each configuration is an arbitrary configuration having a similar function. May be replaced with, and another arbitrary configuration may be added.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
The properties measured on the liquid crystal mixture are as follows.
Tni: Nematic phase-isotropic liquid phase transition temperature (°C)
Δn: refractive index anisotropy at 293K Δε: dielectric anisotropy at 293K γ1: rotational viscosity at 293K (mPa·s)
K11: Elastic constant of spread at 293K (pN)
K33: Elastic constant of bending at 293K (pN)

The following abbreviations are used for the description of the compounds used in each example and each comparative example. N in the abbreviation is a natural number.
(Side chain)
-N -C _n H _{2n + 1:} linear alkyl group n- C _n H _{2n + 1} carbon atoms n -: -On linear alkyl group having a carbon number _n -OC n H _{2n + 1:} the number of carbon atoms n -V1 linear alkoxy group -CH = CH-CH _3: propenyl V- CH ₂ = CH-: vinyl _{1V2- CH 3 -CH = CH-CH} 2 -CH 2 -: pentenyl

(Connection structure)
-NO- -C _n H _2n O-
(Ring structure)

The compositions and physical properties of the liquid crystal mixtures LC1, LC2 and LC3 are shown in Table 1 below.

The following alignment aids (SA1) to (SA8) were used as the alignment aids.

The following compounds were used as the polymerizable compounds.

1. Preparation of liquid crystal composition (Example 1)
A liquid crystal composition by mixing 0.5 parts by mass of an alignment aid (SA1) and 0.3 parts by mass of a polymerizable compound with 100 parts by mass of LC1 (liquid crystal mixture) and heating and melting the mixture. Was prepared.
(Examples 2 to 15, Comparative Examples 1 to 9)
A liquid crystal composition was prepared in the same manner as in Example 1 except that the types of the liquid crystal mixture, the alignment aid and the polymerizable compound were changed as shown in Table 1.

2. Calculation and evaluation 2-1. Calculation of SP value difference The SP value difference between the liquid crystal mixture and the alignment aid was calculated according to the following method.
The liquid crystal mixture (component A) and the alignment aid (component B) are used by using the component dispersion term dD, the polar term dP, and the hydrogen bond term dH of the solubility parameter calculated by commercially available software (Hansen Solubility Parameter in Practice: HSPiP). The SP value difference between and was calculated by the following formula.
SP value difference ^{= [4 (dDA-dDB)} 2 + (dPA-dPB) 2 + (dHA-dHB) 2] 0.5

2-2. Evaluation of low temperature storability First, the liquid crystal composition was filtered using a membrane filter (manufactured by Agilent Technologies, PTFE filter: diameter 13 mm, pore diameter 0.2 μm), and allowed to stand for 15 minutes under vacuum reduced pressure conditions to dissolve air. Removed.
Next, this was washed with acetone, and 0.5 g was weighed in a sufficiently dried vial, and allowed to stand in an environment of -25°C for 10 days.
Then, the presence or absence of the precipitation of the alignment aid was visually observed, and the evaluation was made according to the following three-step evaluation criteria.

[Evaluation criteria]
◯: No precipitation of the alignment aid is confirmed.
Δ: Precipitation of the orientation aid can be confirmed.
X: The orientation aid cannot be dissolved and the evaluation test cannot be performed.

2-3. Evaluation of Vertical Alignment First, a first substrate (common electrode substrate) having a transparent electrode layer made of a patterned transparent common electrode on an insulating layer and having no alignment film provided with a color filter layer, A second substrate (pixel electrode substrate) having no alignment film having a pixel electrode layer having a transparent pixel electrode driven by an active element was prepared.
Next, after the liquid crystal composition was dropped on the first substrate, the liquid crystal composition was sandwiched on the second substrate, and the sealing material was cured under normal pressure at 110° C. for 2 hours to obtain a liquid crystal having a cell gap of 3.2 μm. I got a cell.
The vertical orientation at this time was observed using a polarizing microscope and evaluated according to the following four-step evaluation criteria.

[Evaluation criteria]
◎: Vertical alignment uniformly over the entire surface ○: Acceptable level with slight alignment defects △: Unacceptable level with alignment defects ×: Alignment failure is considerably poor

2-4. Evaluation of Drop Mark Using the liquid crystal cell prepared in the above-described evaluation of vertical alignment property, the alignment unevenness derived from the drop mark was observed using a polarizing microscope, and evaluated according to the following four-step evaluation criteria.

⊚: No dripping marks ◯: Even though there are very few dripping marks, acceptable level Δ: With dripping marks, unacceptable level ×: With dripping marks, considerably poor The above results are shown in Table 2 below.

In Comparative Examples 1 to 3, the SP value difference was small and the low temperature storage stability was relatively good, but the vertical alignment property was not sufficient. In Comparative Examples 4 to 9, the SP value difference was too large, the compatibility between the liquid crystal mixture and the alignment aid was low, and immediately after the preparation of the liquid crystal composition, the alignment aid was precipitated, resulting in vertical alignment and drop marks. Could not be evaluated.
From the above results, each example is better than each comparative example in low-temperature storability, vertical alignment and suppression of drop mark generation, and is suitable for achieving vertical alignment in a liquid crystal cell having no alignment film. I knew there was.

1 Liquid Crystal Display Element AM Active Matrix Substrate CF Color Filter Substrate 2 First Substrate 3 Second Substrate 4 Liquid Crystal Layer 5 Pixel Electrode Layer 6 Common Electrode Layer 7 First Polarizing Plate 8 Second Polarizing Plate 9 Color Filter 11 Gate Bus line 12 Data bus line 13 Pixel electrode 14 Cs electrode 15 Source electrode 16 Drain electrode 17 Contact hole

Claims (15)

A liquid crystal composition comprising a liquid crystal mixture containing a plurality of types of liquid crystal molecules, and an alignment aid having at least one adsorptive group and spontaneously aligning the liquid crystal molecules,
A liquid crystal composition, wherein the difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment aid is 17 or less. The liquid crystal composition according to claim 1, wherein the difference between the solubility parameter of the liquid crystal mixture and the solubility parameter of the alignment aid is more than 2. The liquid crystal composition according to claim 1, wherein the adsorption group is selected from a cyclic group containing an oxygen atom and a chain group containing an oxygen atom. The liquid crystal composition according to claim 1, wherein the alignment aid contains at least one polymerizable group. The liquid crystal composition according to claim 4, wherein the polymerizable group is selected from the group represented by the following general formulas (AP-1) to (AP-9).

(In the formula, R ^AP1 and R ^AP2 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 10 carbon atoms [one in the alkyl group. or two or more -CH 2 _- may be an oxygen atom is substituted with a -O- or -CO- not directly adjacent, one or more hydrogen atoms in the alkyl group, respectively Independently, it may be substituted with a halogen atom or a hydroxyl group.],
W ^AP1 represents a single bond, —O—, —COO—, —OCO— or —CH ₂ —,
t ^AP1 represents 0, 1 or 2,
* Represents a bond. ) The alignment aid includes a mesogenic group,
The liquid crystal composition according to claim 1, wherein the adsorptive group or the polymerizable group is bonded to the mesogenic group directly or via a spacer group. 7. The liquid crystal composition according to claim 6, wherein the alignment aid includes an alignment inducing group having a function of binding to the opposite side of the mesogenic group to the adsorption group and inducing the alignment of the liquid crystal molecules. The liquid crystal composition according to claim 7, wherein the alignment-inducing group is represented by the following general formula (AK).

(In the formula, R ^AK1 represents a linear or branched alkyl group having 1 to 20 carbon atoms. [One or two or more non-adjacent —CH ₂ — in the alkyl group are each independently And may be substituted with -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-, and one or more hydrogen atoms in the alkyl group May each independently be substituted with a halogeno group.].) The spacer group is an alkylene group having 1 to 30 carbon atoms (provided that —CH ₂ — in the alkylene group is —O—, —CO—, —COO—, —OCO so that oxygen atoms are not directly adjacent to each other. -, -CH=CH- or -C[identical to]C-, and the hydrogen atom in the alkylene group may be substituted with a halogen atom.). Item 4. A liquid crystal composition according to item. The liquid crystal composition according to any one of claims 6 to 9, wherein the mesogenic group is represented by the following general formula (AL).

^{(Wherein, Z AL1} is a single bond, -CH = CH -, - CF = CF -, - C≡C -, - COO -, - OCO -, - OCOO -, - CF 2 O -, - OCF 2 _{-, - CH = CHCOO -,} - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH _{-, - CH 2 -CH (CH} 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH represents a 2 _CH 2 O- or alkylene group having 1 to 20 carbon atoms [in the alkylene radical one or more -CH ₂ - may, -O so that oxygen atoms are not directly adjacent -, - COO- or may be substituted with -OCO-],.
A ^AL1 and A ^AL2 each independently represent a divalent cyclic group,
One or more hydrogen atoms in Z ^AL1 , A ^AL1 and A ^AL2 may be independently substituted with a halogeno group, the adsorbing group, P ^AP1- Sp ^AP1 -or a monovalent organic group. Well [P ^AP1 represents the polymerizable group, and Sp ^AP1 represents a single bond or the spacer group. ],
When a plurality of Z ^AL1 and A ^AL1 are present in the molecule, they may be the same or different from each other,
m ^AL1 represents an integer of 1 to 5. ) The liquid crystal composition according to claim 1, further comprising a polymerizable compound represented by the following general formula (P).

(In the formula (P), R ^p1 represents a hydrogen atom, a fluorine atom, a cyano group, an alkyl group having 1 to 15 carbon atoms or —Sp ^p2 —P ^p2 [one present in the alkyl group or adjacent to the same. Two or more —CH ₂ — which may not be independently substituted with —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—, One or more hydrogen atoms present in the alkyl group may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom.],
P ^p1 and P ^p2 each independently represent one of the following general formula (P ^p1-1 ) to formula (P ^p1 -9),

[In the formula, R ^p11 and R ^p12 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 5 carbon atoms, and W ^p11 is a single bond, -O -, - COO -, - OCO-, or -CH ₂ - ^{represents, t pi 1} may represent 0, 1, or ^{2, R p11, R p12,} W p11 and / or ^{t pi 1} in the molecule When two or more are present, they may be the same or different, and * represents a bond. ]
Sp ^p1 and Sp ^p2 each independently represent a single bond or the spacer group,
Z ^p1 and Z ^p2 are each independently a single bond, —O—, —S—, —CH ₂ —, —OCH ₂ —, —CH ₂ O—, —CO—, —C ₂ H ₄ —, _{-COO -, - OCO -, -} OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR ZP1 -, - NR ZP1 -CO -, - SCH 2 -, - CH 2 S ^{-, - CH = CR ZP1 -COO} -, - CH = CR ZP1 -OCO -, - COO-CR ZP1 = CH -, - OCO-CR ZP1 = CH -, - COO-CR ZP1 = CH-COO -, - ^{COO-CR ZP1 = CH-OCO} -, - OCO-CR ZP1 = CH-COO -, - OCO-CR ZP1 = CH-OCO -, - (CH 2) 2 -COO -, - (CH 2) 2 -OCO _{-, - OCO- (CH 2)} 2 -, - (C = O) -O- (CH 2) 2 -, - CH = CH -, - CF = CF -, - CF = CH -, - CH = CF _{-, - CF 2 -, -} CF 2 O -, - OCF 2 -, - CF 2 CH 2 -, - CH 2 CF 2 -, - CF 2 CF 2 - or an -C≡C- [wherein, R ^{ZP1 s} each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, but when a plurality of R ^{ZP1 s} are present in the molecule, they may be the same or different. ],
A ^p1 , A ^p2 and A ^p3 are each independently,
(A ^p )1,4-cyclohexylene group [One —CH ₂ — present in this group or two or more —CH ₂ — which are not adjacent to each other may be substituted with —O—. ]
^(B p) 1,4-phenylene group [this one which is present in the group -CH = or non-adjacent two or more -CH = may be replaced by -N =. ] And ^(c p) naphthalene-2,6-diyl group, a naphthalene-1,4-diyl group, naphthalene-1,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group , Decahydronaphthalene-2,6-diyl group, phenanthrene-2,7-diyl group or anthracene-2,6-diyl group [one -CH= present in these groups or two non-adjacent groups] The above -CH= may be replaced with -N=. ]
Group [wherein the group selected from the group consisting of (a ^p), group (b ^p) and group (c ^p) are each independently hydrogen atoms present in this group, a halogen atom, carbon atom 1 It may be substituted with an alkyl group having 8 to 8 or an alkenyl group having 1 to 8 carbon atoms, a cyano group, or -Sp ^p2- P ^p2 . ],
m ^p1 represents 0, 1, 2 or 3,
^{If Z p1,} A ^{p2, Sp} p2 and / or ^{P p2} is more present in the molecule, they may be the same or ^different, but ^{m p1} is ^{0, A p1} is the group ^(c p) When A ^p3 may be a single bond. ) A liquid crystal display device comprising two substrates and a liquid crystal layer provided between the two substrates and containing the liquid crystal composition according to any one of claims 1 to 11. The liquid crystal display device according to claim 12, wherein the liquid crystal layer contains a polymer of the alignment aid. 14. The liquid crystal display device according to claim 12, which is a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type. The liquid crystal display element according to claim 12, wherein at least one of the two substrates has no alignment film.

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