JP7456747B2 - optical laminate - Google Patents

Description

The present invention relates to a polarizer, a polarizer composite, and an optical laminate.

Polarizers are widely used as polarized light supply elements and polarized light detection elements in display devices such as liquid crystal display devices and organic electroluminescent (EL) display devices. Display devices equipped with polarizers are also being used in mobile devices such as notebook personal computers and mobile phones, and due to demands for diversification of display purposes, clarification of display categories, decoration, etc. Polarizers with different regions are required. Particularly in small and medium-sized mobile terminals such as smartphones and tablet terminals, a polarizer is sometimes pasted over the entire display surface in order to create a borderless design over the entire surface from a decorative point of view. In this case, the polarizer may overlap the camera lens area and the icon or logo printing area at the bottom of the screen, resulting in problems such as poor camera sensitivity and poor design.

For example, in Patent Document 1, a polarizer included in a polarizing plate is partially provided with a dichroic substance low concentration area where the dichroic substance content is relatively low, and the dichroic substance low concentration area is corresponded to the dichroic substance low concentration area. It is stated that by arranging the camera in such a way that the camera performance is not adversely affected.

Japanese Patent Application Publication No. 2015-215609

In Patent Document 1, a resin film containing a dichroic substance is subjected to a chemical treatment of contacting with a basic solution to partially decolorize the resin film to form a dichroic substance low concentration area. The basic solution used for decolorization requires time and cost to dispose of as waste liquid. Further, Patent Document 1 describes that when iodine is used as a dichroic substance, by contacting it with a basic solution, the iodine content can be reduced and a dichroic substance low concentration area can be formed. ing. However, there is no disclosure regarding a specific method for forming a dichroic substance low concentration area when a dichroic substance other than iodine is used.

The present invention aims to provide a novel polarizer, polarizer composite, and optical laminate that can replace polarizers in which regions with a low content of dichroic material are formed by chemical treatment such as bleaching.

The present invention provides the following polarizer, polarizer composite, and optical laminate.
[1] It has a polarizing region and a non-polarizing region surrounded by the polarizing region in plan view,
The thickness of the polarizing region is 15 μm or less,
The non-polarizing region is a polarizer in which a cured product of active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in plan view.
[2] The polarizer according to [1], wherein the thickness of the cured product is the same as the thickness of the polarizing region.
[3] The polarizer according to [1], wherein the thickness of the cured product is smaller than the thickness of the polarizing region.
[4] The polarizer according to [1], wherein the thickness of the cured product is greater than the thickness of the polarizing region.
[5] The polarizer according to any one of [1] to [4], wherein the non-polarizing region has light-transmitting properties.
[6] The polarizer according to any one of [1] to [5], wherein the non-polarizing region has a diameter in a plan view of 0.5 mm or more and 20 mm or less.
[7] The polarizer according to any one of [1] to [6], wherein the active energy ray-curable resin contains an epoxy compound.
[8] The polarizer according to [7], wherein the epoxy compound includes an alicyclic epoxy compound.
[9] A polarizer composite comprising the polarizer according to any one of [1] to [8] and a reinforcing material provided on at least one surface side of the polarizer,
The reinforcing material is a polarizer composite having a plurality of cells arranged such that each open end face faces the surface of the polarizer.
[10] The polarizer composite according to [9], wherein the opening of the cell has a polygonal shape, a circular shape, or an elliptical shape.
[11] The polarizer composite according to [9] or [10], further comprising a translucent filler provided in the inner space of the cell.
[12] An optical laminate having a protective layer on at least one side of the polarizer according to any one of [1] to [8] or the polarizer composite according to any one of [9] to [11]. .
[13] The optical laminate according to [12], wherein the protective layer is a cured layer of active energy ray-curable resin provided on the polarizer.
[14] In [13], the active energy ray curable resin constituting the protective layer is the same active energy ray curable resin as the active energy ray curable resin constituting the cured product included in the polarizing region. The optical laminate described above.

According to the present invention, a novel polarizer, a polarizer composite, and an optical laminate can be provided.

(a) is a schematic plan view schematically showing an example of the polarizer of the present invention, and (b) to (d) are zz' cross-sectional views of the polarizer shown in (a). (a) and (b) are diagrams schematically showing an example of a cross section around a non-polarizing region of a polarizer, and are for explaining a method for determining the thickness of a cured material provided in a non-polarizing region. It is an explanatory diagram. (a) to (e) are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizer of the present invention. (a) is a schematic cross-sectional view schematically showing an example of a polarizer composite of the present invention, and (b) is a schematic plan view of the reinforcing material side of the polarizer composite shown in (a). (a) to (c) are schematic cross-sectional views schematically showing an example of the optical laminate of the present invention. It is a schematic sectional view showing typically another example of an optical layered product of the present invention. It is a schematic sectional view showing still another example of an optical layered product of the present invention typically. It is a schematic sectional view showing still another example of an optical layered product of the present invention typically.

Hereinafter, preferred embodiments of the polarizer, polarizer composite, and optical laminate of the present invention will be described with reference to the drawings. In all the drawings below, each component is shown adjusted to an appropriate scale to make it easier to understand, and the scale of each component shown in the drawings does not necessarily match the actual scale of the component.

<Polarizer>
FIG. 1(a) is a schematic plan view schematically showing an example of the polarizer of this embodiment, and FIGS. 1(b) to (d) are zz views of the polarizer shown in FIG. 1(a). 'This is a cross-sectional view. The polarizer 10 shown in FIGS. 1(a) to 1(d) has a polarizing region 11 and a non-polarizing region 12 surrounded by the polarizing region 11 in plan view. The thickness of the polarizing region 11 is 15 μm or less. In the non-polarizing region 12, a cured product of an active energy ray-curable resin (hereinafter sometimes referred to as "curable resin (X)") is provided in a through hole 22 surrounded by the polarizing region 11 in plan view. This is an area where

As shown in FIG. 1(a), the polarizer 10 has a non-polarizing region 12 surrounded by a polarizing region 11 in plan view. Therefore, when applying the polarizer 10 to a display device such as a liquid crystal display device or an organic EL display device used in smartphones, tablet terminals, etc., it is possible to use a camera lens, an icon, a logo, etc. in correspondence with the non-polarizing region 12. By arranging the printed portion, it is possible to suppress a decrease in camera sensitivity and a decrease in design.

In the polarizer 10, since the through hole 22 is provided with a cured product of the curable resin (X), the non-polarizing region 12 can be made solid. Since the polarizer 10 is thin, with a thickness of 15 μm or less, when the non-polarizing region 12 is not provided with a cured product of the curable resin (X) and the through holes 22 are hollow, when applied to a display device, etc. There is a possibility that defects such as cracks occurring around the through hole 22 may occur due to shrinkage of the polarizer due to changes in temperature exposed to the polarizer. On the other hand, as in the polarizer 10, by providing a cured product of the curable resin (X) in the through hole 22, the non-polarizing region 12 can be made solid, thereby suppressing the occurrence of the above-mentioned problems. can do.

The arrangement of the polarizing region 11 and the non-polarizing region 12 in the polarizer 10 is not particularly limited as long as the polarizing region 11 is provided so as to surround the non-polarizing region 12. In a plan view of the polarizer 10, the total area occupied by the polarizing regions 11 is preferably larger than the total area occupied by the non-polarizing regions 12. The polarizer 10 only needs to have one non-polarizing region 12, and may have two or more non-polarizing regions 12. When having two or more non-polarizing regions 12, the shapes of the respective non-polarizing regions 12 may be the same or different from each other.

The polarizer 10 may be a sheet body, or may be an elongated body having a length that is wound into a roll shape during storage, transportation, etc. The planar shape and size of the polarizer 10 are not particularly limited, and are determined depending on the size of the display device to which the polarizer 10 is applied.

(Polarization area)
The polarizing region 11 of the polarizer 10 preferably exhibits absorption dichroism at a wavelength in the range of 380 nm to 780 nm. The polarizer 10 has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis). This can be obtained mainly by the polarizing region 11.

The polarizing region 11 is made of a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or a partially saponified ethylene/vinyl acetate copolymer film, and a dichroic dye such as iodine or a dichroic dye. A dichroic substance is adsorbed and oriented on a polyene-based oriented film or a liquid crystal compound oriented, such as a dehydrated polyvinyl alcohol or a dehydrochloric acid treated polyvinyl chloride. things; etc. can be used. Among these, it is preferable to use one obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching the film as it has excellent optical properties.

First, a method for manufacturing the preferable polarizing region 11, which is obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it, will be briefly described.

Staining with iodine is performed, for example, by immersing a polyvinyl alcohol film in an aqueous iodine solution. The stretching ratio for uniaxial stretching is preferably 3 to 7 times. Stretching may be carried out after the dyeing treatment or may be carried out while dyeing. Alternatively, it may be dyed after being stretched.

The polyvinyl alcohol film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, etc., as necessary. For example, by immersing the polyvinyl alcohol film in water and washing it before dyeing, not only can dirt and anti-blocking agents on the surface of the polyvinyl alcohol film be washed away, but the polyvinyl alcohol film can also be swelled to prevent uneven dyeing, etc.

The stretching treatment, dyeing treatment, crosslinking treatment (boric acid treatment), water washing treatment, and drying treatment of the polyvinyl alcohol resin film may be performed according to the method described in JP-A-2012-159778, for example. In the method described in this document, a polyvinyl alcohol resin layer that becomes the polarizing region 11 is formed by coating a base film with a polyvinyl alcohol resin. At this time, the base film used can also be used as the first support layer 25 described later.

Next, the polarizing region 11, which is formed by adsorbing and aligning a dichroic dye to an aligned liquid crystal compound, will be briefly described. In this case, the polarizing region 11 may be a liquid crystal compound, as described in, for example, JP-A No. 2013-37353, JP-A No. 2013-33249, JP-A No. 2016-170368, and JP-A No. 2017-83843. A dichroic dye may be oriented in a cured film obtained by polymerization. As the dichroic dye, one having absorption within the wavelength range of 380 to 800 nm can be used, and it is preferable to use an organic dye. Examples of dichroic dyes include azo compounds. The liquid crystal compound is a liquid crystal compound that can be polymerized while being oriented, and can have a polymerizable group in the molecule. A cured film obtained by polymerizing such a liquid crystal compound may be formed on a base film, and in that case, the base film can also be used as the first support layer 25 described below.

It is also preferable to form the polarizer 10 by forming the non-polarizing region 12 by drilling after producing the polarizing film used for the polarizing region 11 as described above. In this specification, a polarizing film formed only of such polarizing regions 11 may be referred to as a raw material polarizer 20.

The visibility-corrected polarization degree (Py) of the polarization region 11 is preferably 80% or more, more preferably 90% or more, still more preferably 95% or more, and particularly preferably 99% or more. The single transmittance (Ts) of the polarizing region 11 is usually less than 50%, and may be 46% or less. The single transmittance (Ts) of the polarizing region 11 is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, particularly preferably 40.5% or more. .

The single transmittance (Ts) is a Y value measured in accordance with JIS Z8701 2-degree visual field (C light source) and subjected to visibility correction. The visibility correction polarization degree (Py) can be measured using, for example, an ultraviolet-visible spectrophotometer (manufactured by JASCO Corporation, product name: V7100), and the visibility correction polarization degree (Py) can be measured using the parallel transmittance Tp and the orthogonal It is determined by the following formula based on the transmittance Tc.
Py [%] = {(Tp-Tc)/(Tp+Tc)} ^1/2 ×100

The thickness of the polarizing region 11 is 15 μm or less, may be 13 μm or less, may be 10 μm or less, may be 8 μm or less, may be 5 μm or less, and is usually 1 μm or more. If the thickness of the polarizing region 11 exceeds the above range, the workability for providing the active energy ray-curable resin composition containing the curable resin (X) described below in the non-polarizing region 12 is likely to decrease. Furthermore, if the polarization region 11 is less than the above range, it becomes difficult to obtain desired optical characteristics. The thickness of the polarizing region 11 can be measured using, for example, a contact type film thickness measuring device (MS-5C, manufactured by Nikon Corporation).

(Non-polarized region)
Generally, "unpolarized light" refers to light that has no observable regularity in its electric field components. In other words, unpolarized light is random light in which no particular polarization state is observed to be dominant. Further, "partially polarized light" refers to light that is in an intermediate state between polarized light and unpolarized light, and means light that is a mixture of unpolarized light and at least one of linearly polarized light, circularly polarized light, and elliptically polarized light. The non-polarizing region 12 in the polarizer 10 means that the light (transmitted light) that passes through the non-polarizing region 12 becomes non-polarized light or partially polarized light. In particular, a non-polarized region where transmitted light is non-polarized light is preferred.

The non-polarizing region 12 of the polarizer 10 is an area surrounded by the polarizing region 11 in plan view. The non-polarizing region 12 contains a cured product of curable resin (X). The non-polarizing region 12 is formed by curing an active energy ray-curable resin composition containing a curable resin (X), which will be described later, in a through hole provided in a polarizer (raw material polarizer 20) formed only with the polarizing region 11. Preferably, it is equipped with a material. The non-polarizing region 12 has translucency. In this specification, translucency refers to the property (transmittance) of transmitting 80% or more of visible light in the wavelength range of 400 nm to 700 nm, preferably transmitting 85% or more, and preferably transmitting 90% or more. Preferably, one that transmits 92% or more is more preferable. The definition of "translucency" below and the preferable range of transmittance for visible light are also the same as above.

Since the non-polarizing region 12 of the polarizer 10 has light-transmitting properties, optical transparency can be ensured in the non-polarizing region 12. As a result, when applying the polarizer 10 to a display device, by arranging a printed part such as a camera lens, an icon, or a logo in correspondence with the non-polarizing area 12, the sensitivity of the camera and the design quality are reduced. can be suppressed.

The planar shape of the non-polarizing region 12 is not particularly limited, but may include a circle; an ellipse; an oval shape; a polygon such as a triangle or a quadrangle; a polygon in which at least one corner is rounded (a shape having an R); It can be a polygon, etc.

The diameter of the non-polarized region 12 is preferably 0.5 mm or more, and may be 1 mm or more, 2 mm or more, or 3 mm or more. The diameter of the non-polarized region 12 is preferably 20 mm or less, and may be 15 mm or less, 10 mm or less, or 7 mm or less. The diameter of the non-polarized region 12 refers to the length of the longest straight line connecting any two points on the periphery of the non-polarized region 12.

The thickness of the cured resin (X) provided in the non-polarizing area 12 may be the same as the thickness of the polarizing area 11 (FIG. 1(b)), or may be smaller than the thickness of the polarizing area 11. (FIG. 1(c)), and may be larger than the thickness of the polarizing region 11 (FIG. 1(d)). The cured product of the curable resin (X) provided in the non-polarizing region 12 is preferably provided so as to fill the entire through hole 22 .

The thickness of the cured product in the non-polarizing region 12 is determined as follows. First, in the polarizer 10, a first plane including one surface of the polarizing region 11 and a second plane including the other surface are assumed. Next, in the non-polarizing region 12, a first position where the shortest distance between the surface of the cured product on the one surface side and the first plane is maximum, and a first position of the cured product on the other surface side. A second position is determined, which is a position where the shortest distance between the surface and the second plane is maximum. Then, the sum of the shortest distance (dm) at the first position, the shortest distance (dn) at the second position, and the distance (D) between the first plane and the second plane (dm+dn+D) is calculated from the non-polarizing area 12. The thickness of the cured product shall be .

A method for determining the thickness when the thickness of the cured material provided in the non-polarizing region 12 and the thickness of the polarizing region 11 are different will be specifically explained based on FIG. 2. FIGS. 2(a) and 2(b) are diagrams schematically showing an example of a cross section around a non-polarizing region of a polarizer, and illustrate a method for determining the thickness of a cured material provided in a non-polarizing region. FIG.

When the cured product is provided in the non-polarizing region 12 as shown in FIG. Assume that The length of the straight line (Fig. 2 The position where "dm" in (a) is maximum is defined as the first position. Next, as shown in FIG. 2A, a straight line shown by a dashed line in the non-polarizing region 12 along the other surface side of the polarizing region 11 is assumed to be the second plane 11n. The length of the straight line (Fig. 2 The position where "dn" in (a) is maximum is defined as the second position. Here, as shown in FIG. 2(a), the surface of the cured material provided in the non-polarizing region 12 is closer to the inner surface than the first plane 11m and second plane 11n in the thickness direction of the polarizer 10 ( When present on the polarizer 10 side), dm and dn are shown as negative values. Further, let D be the distance between the first plane 11m and the second plane 11n. Then, the thickness of the cured material provided in the non-polarizing region 12 shown in FIG. 2(a) can be determined as D+dm+dn (dm and dn are negative values).

Furthermore, as shown in FIG. 2B, in the case where the cured material is provided in the non-polarizing region 12, by assuming the first plane 11m and the second plane 11n, the non-polarizing region 12 It is possible to determine the thickness of the cured material provided in the. Specifically, first, among the straight lines that connect any point on the first plane 11m and any point on the surface of the cured material provided in the non-polarizing area 12, the straight line is the shortest distance. The position where the length ("dm" in FIG. 2(b)) is maximum is defined as the first position. Next, the length of the straight line ( The position where "dn" in FIG. 2(b) is maximum is defined as the second position. Here, as shown in FIG. 2(b), the surface of the cured material provided in the non-polarizing region 12 is on the outer surface side ( (on the opposite side of the polarizer 10), dm and dn are shown as positive values. Then, the thickness of the cured material provided in the non-polarizing region 12 shown in FIG. 2(b) can be determined as D+dm+dn (dm and dn are positive values).

(Active energy ray-curable resin composition (curable resin composition))
As described above, the non-polarizing region 12 in the polarizer 10 is a region provided with a cured product of an active energy ray-curable resin (curable resin (X)), and preferably contains the curable resin (X). It is formed from an active energy ray-curable resin composition (hereinafter sometimes referred to as a "curable resin composition"). The curable resin (X) contained in the curable resin composition is one that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. The curable resin (X) is preferably an ultraviolet curable resin that is cured by irradiation with ultraviolet rays. The curable resin composition containing the curable resin (X) may be an active energy ray-curable adhesive, and in this case, it is more preferably an ultraviolet curable adhesive.

It is preferable that the curable resin composition is solvent-free. Solvent-free type means that no solvent is actively added. Specifically, a solvent-free curable resin composition refers to the curable resin ( X) It means that the solvent content is 5% by weight or less based on 100% by weight.

It is preferable that the curable resin (X) contains an epoxy compound. An epoxy compound is a compound having one or more, preferably two or more, epoxy groups in the molecule. Examples of the epoxy compound include alicyclic epoxy compounds, aliphatic epoxy compounds, hydrogenated epoxy compounds (glycidyl ether of polyols having an alicyclic ring), and the like. The number of epoxy compounds contained in the curable resin (X) may be one, or two or more.

The content of the epoxy compound is preferably 40% by weight or more, more preferably 50% by weight or more, and still more preferably 60% by weight or more based on 100% by weight of the curable resin (X). preferable. The content of the epoxy compound may be 100% by weight or less, may be 90% by weight or less, and may even be 80% by weight or less, based on 100% by weight of the curable resin (X). However, it may be 75% by weight or less.

The epoxy equivalent of the epoxy compound is usually within the range of 40 to 3000 g/equivalent, preferably 50 to 1500 g/equivalent. If the epoxy equivalent exceeds 3000 g/equivalent, the compatibility with other components contained in the curable resin (X) may decrease.

The epoxy compound contained in the curable resin (X) preferably contains an alicyclic epoxy compound. Alicyclic epoxy compounds are epoxy compounds that have one or more epoxy groups bonded to an alicyclic ring in the molecule. "Epoxy group bonded to an alicyclic ring" means a bridging oxygen atom -O- in the structure shown in the following formula. In the following formula, m is an integer from 2 to 5.

A compound in which a group in which one or more hydrogen atoms in (CH ₂ ) _m in the above formula are removed is bonded to another chemical structure can be an alicyclic epoxy compound. One or more hydrogen atoms in (CH ₂ ) _m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. Among alicyclic epoxy compounds, epoxy compounds having an oxabicyclohexane ring (m = 3 in the above formula) or an oxabicycloheptane ring (m = 4 in the above formula) are suitable for the polarization region of the polarizer 10. 11 and the cured product of the curable resin (X) forming the non-polarizing region 12, it is preferably used because it provides excellent adhesion. Specific examples of alicyclic epoxy compounds that are preferably used are shown below, but the present invention is not limited to these compounds.

［式（ＩＶ）中、Ｒ^８及びＲ^９は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [a] Epoxycyclohexylmethyl epoxycyclohexane carboxylates represented by the following formula (IV):

[In formula (IV), R ⁸ and R ⁹ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（Ｖ）中、Ｒ^１０及びＲ^１１は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｎは２～２０の整数を表す。］ [b] Epoxycyclohexane carboxylates of alkanediol represented by the following formula (V):

[In formula (V), R ¹⁰ and R ¹¹ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20. ]

［式（ＶＩ）中、Ｒ^１２及びＲ^１３は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｐは２～２０の整数を表す。］ [c] Epoxycyclohexylmethyl esters of dicarboxylic acid represented by the following formula (VI):

[In formula (VI), R ¹² and R ¹³ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20. ]

［式（ＶＩＩ）中、Ｒ^１４及びＲ^１５は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｑは２～１０の整数を表す。］ [d] Epoxycyclohexyl methyl ethers of polyethylene glycol represented by the following formula (VII):

[In formula (VII), R ¹⁴ and R ¹⁵ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10. ]

［式（ＶＩＩＩ）中、Ｒ^１６及びＲ^１７は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｒは２～２０の整数を表す。］ [e] Epoxycyclohexyl methyl ethers of alkanediol represented by the following formula (VIII):

[In formula (VIII), R ¹⁶ and R ¹⁷ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20. ]

［式（ＩＸ）中、Ｒ^１８及びＲ^１９は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [f] Diepoxytrispiro compound represented by the following formula (IX):

[In formula (IX), R ¹⁸ and R ¹⁹ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（Ｘ）中、Ｒ^２０及びＲ^２１は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [g] Diepoxy monospiro compound represented by the following formula (X):

[In formula (X), R ²⁰ and R ²¹ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（ＸＩ）中、Ｒ^２２は、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [h] Vinylcyclohexene diepoxides represented by the following formula (XI):

[In formula (XI), R ²² represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]

［式（ＸＩＩ）中、Ｒ^２３及びＲ^２４は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [i] Epoxycyclopentyl ethers represented by the following formula (XII):

[In formula (XII), R ²³ and R ²⁴ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（ＸＩＩＩ）中、Ｒ^２５は、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [j] Diepoxytricyclodecane represented by the following formula (XIII):

[In formula (XIII), R ²⁵ represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

Examples of aliphatic epoxy compounds include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. More specifically, diglycidyl ether of 1,4-butanediol; diglycidyl ether of 1,6-hexanediol; triglycidyl ether of glycerin; triglycidyl ether of trimethylolpropane; diglycidyl ether of polyethylene glycol; propylene Diglycidyl ether of glycol; polyglycidyl of polyether polyol obtained by adding one or more alkylene oxides (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohol such as ethylene glycol, propylene glycol or glycerin. Examples include ether.

The hydrogenated epoxy compound is obtained by reacting epichlorohydrin with an alicyclic polyol obtained by hydrogenating the aromatic ring of an aromatic polyol. Examples of aromatic polyols include bisphenol type compounds such as bisphenol A, bisphenol F, and bisphenol S; novolak type resins such as phenol novolak resin, cresol novolak resin, and hydroxybenzaldehyde phenol novolak resin; tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, polyvinylphenol, etc. Examples include polyfunctional compounds. Among the hydrogenated epoxy compounds, hydrogenated diglycidyl ether of bisphenol A is preferred.

The curable resin (X) may contain a (meth)acrylic compound or the like together with an active energy ray-curable compound such as an epoxy compound. By using a (meth)acrylic compound in combination, the adhesion between the cured product of the curable resin (X) forming the polarizing region 11 and the non-polarizing region 12 of the polarizer 10, The effect of increasing the hardness and mechanical strength of the cured product can be expected, and furthermore, the viscosity, curing speed, etc. of the curable resin (X) can be adjusted more easily. "(Meth)acrylic" means at least one selected from the group consisting of acrylic and methacryl.

The curable resin composition containing the curable resin (X) preferably contains a polymerization initiator. Examples of the polymerization initiator include cationic polymerization agents such as photocationic polymerization agents and radical polymerization initiators. The photocationic polymerization initiator generates cationic species or Lewis acids upon irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, and initiates the polymerization reaction of epoxy groups. As mentioned above, the curable resin (X) is preferably an ultraviolet curable resin that is cured by irradiation with ultraviolet rays, and the curable resin (X) preferably contains an alicyclic epoxy compound. The polymerization initiator is preferably one that generates a cationic species or a Lewis acid upon irradiation with ultraviolet rays.

The curable resin composition further contains a photosensitizer, a polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, and an antifoaming agent. It may contain additives such as antistatic agents, antistatic agents, and leveling agents.

(Manufacturing method of polarizer)
FIGS. 3(a) to 3(e) are schematic cross-sectional views schematically showing an example of the method for manufacturing the polarizer of this embodiment. Although FIGS. 3(a) to 3(e) show the case where the polarizer 10 shown in FIG. 1(b) is obtained, the polarizer 10 shown in FIGS. 1(c) and (d) will also be described below. It can be manufactured by a method. The polarizer 10 can be manufactured using, for example, a raw material polarizer 20 that has the same visibility correction polarization degree (Py) as a whole and does not have the non-polarizing region 12. Since the raw material polarizer 20 is formed only from the polarizing region 11 of the polarizer 10 described above, the thickness of the raw material polarizer 20 is preferably 15 μm or less, which is the same thickness as the polarizing region 11 of the polarizer 10.

The polarizer 10 can be manufactured, for example, by the following process. First, as shown in FIG. 3A, a first laminate 31 is prepared in which a first support layer 25 is provided on one surface of the raw material polarizer 20 so as to be removable from the raw material polarizer 20. A through hole 32 penetrating in the stacking direction is formed in the prepared first laminate 31 by punching, cutting, cutting, laser cutting, etc. (FIG. 3(b)). As a result, a perforated polarizer 21 in which through holes 22 are formed in the raw material polarizer 20 is obtained. Subsequently, after the second support layer 26 is removably provided on the perforated polarizer 21 side of the first laminate 31 in which the through holes 32 are formed (FIG. 3(c)), the first support layer 25 is peeled off. (Figure 3(d)). Thereby, a second laminate 33 in which the second support layer 26 and the perforated polarizer 21 are stacked is obtained (FIG. 3(d)). The second support layer 26 is provided so as to close one side of the through hole 22 of the perforated polarizer 21 .

Next, the through holes 22 of the perforated polarizer 21 of the second laminate 33 are filled with a curable resin composition containing the curable resin (X), and activated energy rays are irradiated to fill the through holes 22 with the curable resin composition. Curing the curable resin (X). Thereby, a cured product of the curable resin (X) is formed in the through holes 22 of the perforated polarizer 21, and a polarizer 10 laminated on the second support layer 26 is obtained (FIG. 3(e)). After forming the cured product, the second support layer 26 may be peeled off. In the obtained polarizer 10, the region other than the through holes 22 of the perforated polarizer 21 becomes the polarizing region 11, and the region of the through hole 22 provided with the cured material becomes the non-polarizing region 12.

The method for filling the through holes 22 of the perforated polarizer 21 with the curable resin composition is not particularly limited. For example, the curable resin composition may be injected into the through holes 22 of the perforated polarizer 21 of the second laminate 33 using a dispenser or a dispenser. The through holes 22 of the perforated polarizer 21 may be filled with the curable resin composition while coating the surface of the polarizer 21 with the curable resin composition. The cured product layer of the curable resin composition coated on the surface of the perforated polarizer 21 can be used as a protective layer to be described later. When coating with a curable resin composition, a base film may be provided to cover the surface of the coating layer formed by coating. The base film may be used as a protective layer to be described later, and in this case, the cured product layer of curable resin (X) may be a lamination layer for laminating the protective layer to be described later. The base film may be peeled off after the curable resin (X) contained in the curable resin composition is cured.

The first support layer 25 may be a support layer used when manufacturing the raw material polarizer 20, or the above-mentioned base film used when coating the curable resin composition. Alternatively, it may be a removable support layer bonded to the raw material polarizer 20 using a volatile liquid such as water, or an adhesive sheet that can be peeled off from the raw material polarizer 20. The second support layer 26 may be a peelable support layer bonded to the perforated polarizer 21 using a volatile liquid such as water, or may be an adhesive sheet that can be peeled off from the perforated polarizer 21. It's okay.

As described above, by making the thickness of the raw polarizer 20 15 μm or less, the depth of the through-hole 22 provided in the holey polarizer 21 can also be made 15 μm or less. This allows the filling of the through-hole 22 of the holey polarizer 21 with the curable resin composition and the curing process of the curable resin (X) contained in the curable resin composition filled in the through-hole 22 to be performed in a short time, thereby suppressing a decrease in workability.

(raw material polarizer)
It is preferable that the raw material polarizer 20 is resistant to significant deterioration by active energy rays applied to cure the curable resin (X) in the curable resin composition filled in the through holes 22. Such a raw material polarizer 20 is, for example, a film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin film, or a film in which a dichroic dye is oriented in a cured layer of a polymerizable liquid crystal compound. , these manufacturing methods are as explained in the above-mentioned polarizing region 11.

<Polarizer composite>
FIG. 4(a) is a schematic cross-sectional view schematically showing an example of the polarizer composite of this embodiment, and FIG. 4(b) is a schematic plan view of the reinforcing material side of the polarizer composite. In FIG. 4(b), the non-polarizing region 12 of the polarizer 10 is indicated by a wavy line. A polarizer composite 41 shown in FIG. 4A includes a polarizer 10 and a reinforcing material 50 provided on one surface of the polarizer 10. The reinforcing material 50 may be provided on both sides of the polarizer 10.

In the polarizer composite 41 , the reinforcing material 50 has a plurality of cells 51 arranged such that each open end face faces the surface of the polarizer 10 . The cell 51 has a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the cell 51, and both axial ends of the columnar structure are open end faces.

In the polarizer composite 41, the reinforcing material 50 is preferably provided so that the cells 51 are present in the non-polarizing region 12 of the polarizer 10 and a region corresponding to its surroundings, as shown in FIG. 4(a). More preferably, the cells 51 are provided over the entire surface of the polarizer 10.

Since the polarizer 10 has a non-polarizing region 12, it is believed that cracks are likely to occur around the non-polarizing region 12 due to the shrinkage of the polarizer 10 caused by temperature changes when applied to a display device, etc. Furthermore, since the polarizing region 11 of the polarizer 10 is thin, at 15 μm or less, it is believed that cracks are likely to occur when the polarizer 10 is subjected to impact. In the polarizer composite 41, since the reinforcing material 50 is provided on one side of the polarizer 10 as described above, it is believed that it is possible to suppress the occurrence of cracks when subjected to temperature changes or impacts, and the progression of fine cracks to larger cracks.

The polarizer composite 41 shown in FIG. 4(a) includes the polarizer 10 and the reinforcing material 50 shown in FIG. 1(b), but is not limited thereto. For example, the polarizer 10 included in the polarizer composite 41 may be the polarizer 10 shown in FIG. 1(c) or (d).

The reinforcing material 50 is applied to display devices and the like together with the polarizer 10. If the internal space of the cell 51 of the reinforcing material 50 is hollow, there is a possibility that the visibility of the display device may be reduced due to a difference in refractive index between the cell partition wall 53 and the internal space of the cell 51. Therefore, it is preferable that a translucent filler be provided in the internal space of the cells 51 of the reinforcing material 50 in the polarizer composite 41. In the reinforcing material 50 of the polarizer composite 41, when a gap is provided between the plurality of cells 51 as described later, it is preferable that a translucent filler is provided also in this gap.

The filler that may be provided in the reinforcing material 50 is not particularly limited as long as it has translucency and can fill the internal space of the cells 51 of the reinforcing material 50. The filler is preferably a material different from the material that constitutes the cell partitions 53 of the reinforcing material 50, and more preferably contains a resin material. Examples of the resin material include one or more types selected from the group consisting of thermoplastic resins, thermosetting resins, and curable resins such as active energy ray curable resins, and may be an adhesive or a bonding agent.

Examples of thermoplastic resins include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as triacetyl cellulose and diacetyl cellulose; polyethylene terephthalate; Polyester resins such as polyethylene naphthalate and polybutylene terephthalate; polycarbonate resins; (meth)acrylic resins; polystyrene resins; polyether resins; polyurethane resins; polyamide resins; polyimide resins; fluorine resins, etc. Can be mentioned.

Examples of the curable resin include the above-mentioned curable resin (X).

An adhesive exhibits adhesive properties by pasting itself onto an adherend, and is a so-called pressure-sensitive adhesive. Examples of the adhesive include those containing polymers such as (meth)acrylic polymers, silicone polymers, polyester polymers, polyurethane polymers, polyether polymers, or rubber polymers as a main component. In this specification, the main component refers to a component containing 50% by mass or more of the total solid content of the adhesive. The adhesive may be of an active energy ray-curable type or a thermosetting type, and the degree of crosslinking and adhesive strength may be adjusted by irradiation with active energy rays or heating.

The adhesive contains a curable resin component and is an adhesive other than a pressure-sensitive adhesive (adhesive). Examples of the adhesive include water-based adhesives in which a curable resin component is dissolved or dispersed in water, active energy ray-curable adhesives containing active energy ray-curable compounds, thermosetting adhesives, and the like.

As the adhesive, a water-based adhesive commonly used in the technical field of polarizing plates can also be used. Examples of resin components contained in the water-based adhesive include polyvinyl alcohol resins and urethane resins. Examples of active energy ray-curable adhesives include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. As the active energy ray-curable adhesive, a curable resin composition containing the above-mentioned curable resin (X) may be used. Examples of thermosetting adhesives include those containing epoxy resins, silicone resins, phenol resins, melamine resins, etc. as main components.

(Reinforcement material)
As described above, the cells 51 of the reinforcing material 50 have a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the cells 51, and the columnar structure has an open end face with both axial ends open. This is the result. The cell 51 has a first opening end surface disposed on a side relatively close to the polarizer 10 of the polarizer composite 41, and a second opening end surface disposed on a relatively far side. has. The reinforcing material 50 only needs to be arranged so that at least one of the first opening end surface and the second opening end surface faces the polarizer 10, and both the first opening end surface and the second opening end surface It is preferable that they are arranged so as to face the child 10.

The shape of the opening of the cells 51 in the reinforcing material 50 is not particularly limited, but is preferably polygonal, circular, or elliptical. The shape of the opening of the first opening end face and the shape of the opening of the second opening end face are preferably the same shape and size, but may be different shapes, or may be the same shape but different sizes. In addition, the shapes of the openings of the multiple cells in the reinforcing material 50 may be the same as each other, or may be different from each other.

It is preferable that the plurality of cells 51 included in the reinforcing material 50 are arranged such that the openings of each cell 51 are adjacent to each other in a plan view of the opening end surface. The plurality of cells 51 are arranged in such a manner that the cells 51 are arranged without any gaps, as in the case where the opening of the cell 51 has a hexagonal shape, for example, as shown in FIG. You may do so. Alternatively, in a plan view of the opening end surface of the plurality of cells 51, as in the case where the shape of the opening of the cell 51 is circular or the like, a part of the cell partition wall 53 of the plurality of cells 51 is in contact with each other, and the plurality of cells 51 may be arranged with a gap between them.

As shown in FIG. 4(b), for example, the reinforcing material 50 has a hexagonal opening shape at both the first opening end face and the second opening end face, and preferably has a honeycomb structure in which multiple cells are arranged so that the openings are adjacent to each other and arranged without gaps in the plane direction of the polarizer composite 41.

Although the size of the opening of the cell 51 of the reinforcing material 50 is not particularly limited, it is preferable that the opening has a smaller diameter than the diameter of the non-polarizing region 12. The diameter of the cell is preferably 3 mm or less, may be 2 mm or less, may be 1 mm or less, and is usually 0.1 mm or more, and may be 0.5 mm or more. The diameter of the opening of this cell 51 refers to the length of the longest straight line connecting any two points on the outer periphery of the opening.

The height of the cells 51 of the reinforcing material 50 (the length in the direction perpendicular to the opening end surface of the cells 51) is usually 0.1 μm or more, may be 0.5 μm or more, or may be 1 μm or more. , 3 μm or more, and usually 15 μm or less, 13 μm or less, or 10 μm or less.

It is preferable that the cell partition walls 53 that partition the cells 51 of the reinforcing material 50 have translucency.

The line width of the cell partition walls 53 of the reinforcing material 50 is, for example, 0.05 mm or more, may be 0.1 mm or more, may be 0.5 mm or more, may be 1 mm or more, and, It is usually 5 mm or less, and may be 3 mm or less.

The cell partition walls 53 of the reinforcing material 50 can be formed of, for example, a resin material or an inorganic oxide, and are preferably formed of a resin material. Examples of the resin material include curable resins such as thermoplastic resins, thermosetting resins, and active energy ray curable resins. Examples of the resin material include the above-mentioned curable resin (X); the thermoplastic resin exemplified as the thermoplastic resin used for the filler, and the like. Examples of the inorganic oxide include silicon oxide (SiO ₂ ), aluminum oxide, and the like.

When reinforcing materials 50 are provided on both sides of the polarizer 10, the two reinforcing materials 50 may be the same (having the same shape and size of the cells 51) or may be different from each other. The openings of the cells 51 of the two reinforcing materials 50 provided on both sides of the polarizer 10 may be arranged so as to overlap each other in a planar view, but it is preferable that they are arranged so as to be offset from each other in a planar view.

(Method for manufacturing polarizer composite)
The polarizer composite 41 shown in FIG. 4(a) can be manufactured by forming a reinforcing material 50 on the polarizer 10. The reinforcing material 50 can be obtained by forming cell partition walls 53 that partition the cells 51 on the surface of the polarizer 10 using, for example, a resin material or an inorganic oxide.

The method for forming the cell partitions 53 using a resin material is not particularly limited, but examples thereof include printing methods such as inkjet printing, screen printing, and gravure printing; photolithography; and coating methods using nozzles, dies, etc. In the above methods, a resin composition in which the resin material is mixed with a solvent, additives, etc. may be used. Examples of additives include leveling agents, antioxidants, plasticizers, tackifiers, organic or inorganic fillers, pigments, antioxidants, ultraviolet absorbers, and antioxidants. The cell partitions 53 may be formed by subjecting the printed or coated resin composition to a treatment for solidification or hardening as necessary.

Although the method of forming the cell partition 53 using an inorganic oxide is not particularly limited, it can be formed, for example, by vapor deposition of an inorganic oxide.

When the reinforcing material 50 of the polarizer composite 41 has a filler, the reinforcing material 50 formed on the polarizer 10 is filled with a material constituting the filler into the internal spaces of the cells 51 and the gaps between the cells 51. do it. The material constituting the filler may be filled, for example, by coating on the reinforcing material 50. Alternatively, when using an adhesive as the material constituting the filler, a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer provided on a release film may be laminated and filled with the pressure-sensitive adhesive.

<Optical laminate>
5 to 8 are schematic cross-sectional views schematically showing an example of the optical laminate of this embodiment. The optical laminate has a protective layer on one or both sides of the polarizer 10 shown in FIGS. 1(b) to (d) and the polarizer composite 41 shown in FIG. 4(a).

(Optical laminate (1))
The optical laminate 42 shown in FIGS. 5(a) to 5(c) includes a polarizer 10 shown in any of FIGS. 1(b) to 1(d), and a protective layer 17 provided on one side of the polarizer 10. has. The protective layer 17 is a cured layer of curable resin (X) provided directly on the polarizer 10 . The curable resin (X) constituting the protective layer 17, which is a cured material layer, is not particularly limited as long as it is a resin that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Examples include the curable resin (X) described above. The protective layer 17 may be a cured product layer of a curable resin composition containing the same curable resin (X) as the curable resin (X) constituting the cured product contained in the non-polarizing region 12 of the polarizer 10. preferable.

When the protective layer 17 is a cured product layer of the same curable resin (X) as the curable resin (X) constituting the cured product of the polarizer 10, the protective layer 17 covers at least the non-polarizing region 12 of the polarizer 10. It is preferable to do so. The protective layer 17 may cover at least a portion of one side of the polarizer 10, but preferably covers the entire surface of one side of the polarizer 10.

In order to manufacture the optical laminate 42, for example, one side of the polarizer 10 is coated with a curable resin composition, and the curable resin (X ) to harden. Thereby, the protective layer 17, which is a cured layer of curable resin (X), may be formed on the polarizer 10 to obtain the optical laminate 42.

Alternatively, by first coating the surface of the perforated polarizer 21 of the second laminate 33 (FIG. 3(d)) with a curable resin composition, the through holes 22 of the perforated polarizer 21 are coated with a curable resin composition. A resin composition is filled, and a coating layer of the curable resin composition is also formed on the surface of the perforated polarizer 21 . Thereafter, the curable resin (X) contained in the curable resin composition in the through holes 22 and on the surface of the perforated polarizer 21 is cured by irradiation with active energy rays, thereby forming a cured product and a cured product layer. The optical laminate 42 may be obtained by forming a certain protective layer 17. In this case, the cured material contained in the non-polarizing region 12 and the cured material layer constituting the protective layer 17 can be integrated, and the curable resin (X) constituting the protective layer 17 is The curable resin (X) can be the same as the curable resin (X) constituting the cured product contained in the curable resin (X).

In order to manufacture the optical laminate 42 shown in FIGS. 5(b) and (c), when providing the protective layer 17, which is a cured material layer, on the polarizer 10 shown in FIGS. 1(c) and (d), The protective layer 17 may be provided to fill the difference in thickness between the polarizing region 11 and the non-polarizing region 12 of the polarizer 10. Specifically, when obtaining the optical laminate 42 shown in FIG. 5(b), the thickness of the non-polarizing region 12 of the polarizer 10 shown in FIG. 1(c) is smaller than that of the polarizing region 11. On the side (upper surface side in FIG. 1(c)), a protective layer 17 is provided by coating a curable resin (X) so as to fill the thickness difference and cover the surface of the polarizing region 11. Bye. When obtaining the optical laminate 42 shown in FIG. 5C, the side of the polarizer 10 shown in FIG. ), the protective layer 17 may be provided by coating a curable resin composition so as to fill the thickness difference and cover the surfaces of both the polarizing region 11 and the non-polarizing region 12. . In the optical laminate 42 shown in FIG. 5(c), the protective layer 17 is also provided on the surface of the non-polarizing region 12, but the surface of the non-polarizing region 12 is not coated, and only the surface of the polarizing region 11 is coated. The protective layer 17 may be provided as shown in FIG.

When coating with a curable resin composition, a base film may be provided to cover the surface of the coating layer formed by coating. In this case, the base film may be used as the protective layer 17, and the cured product layer of the curable resin (X) may be used as a bonding layer for bonding the protective layer 17 to the polarizer 10. The base film may be peeled off after the curable resin (X) is cured.

(Optical laminate (2))
FIG. 6 is a schematic cross-sectional view schematically showing another example of the optical laminate of this embodiment. The optical laminate 43 shown in FIG. 6 includes an optical laminate 42 (FIG. 5(a)) having a protective layer 17 of a cured material layer of curable resin (X) on one side of a polarizer 10, and an optical laminate 42 (FIG. 5(a)). and a reinforcing material 50 provided on the polarizer 10 side. The reinforcing material 50 may also be provided on the protective layer 17 side of the optical laminate 42 shown in FIG. 5(a).

The reinforcing material 50 is as described in the polarizer composite 41 described above. The optical laminate 43 shown in FIG. 6 can be obtained, for example, by forming the reinforcing material 50 on the optical laminate 42 shown in FIG. 5(a) by the method described above. Alternatively, the optical laminate 43 may be obtained by forming the reinforcing material 50 on the polarizer 10 shown in FIGS. 1(b) to 1(d) by the method described above, and then forming the protective layer 17 by the method described above. .

(Optical laminate (3))
The optical laminate 44 shown in FIG. 7 has protective layers 17 and 18 on both sides of the polarizer 10 shown in FIG. 1(b). The optical laminate 44 may have the protective layer 17 (or 18) on only one side of the polarizer 10. The polarizer 10 included in the optical laminate 44 may be the polarizer 10 shown in FIG. 1(c) or (d). The protective layers 17 and 18 can be provided on the polarizer 10 via a bonding layer such as a pressure-sensitive adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizer 10 via a bonding layer. The protective layers 17 and 18 may be provided so as to be in direct contact with the polarizer 10 without a bonding layer. In this case, for example, the protective layers 17 and 18 can be formed by applying a composition containing a resin material constituting the protective layers 17 and 18 onto the polarizer 10 and solidifying or curing the applied layer. One of the protective layers 17 and 18 may be a protective layer provided via an adhesive layer, and the other may be a protective layer provided without an adhesive layer. The protective layers 17 and 18 included in the optical laminate 44 may be the same as each other or different from each other.

When the optical laminate 44 is obtained by providing the protective layers 17 and 18 on the polarizer 10 shown in FIG. It is preferable to provide a bonding layer so as to fill the difference in thickness with the polarizing region 12, and then provide the protective layers 17 and 18. When the optical laminate 44 is one in which the protective layers 17 and 18 are provided in direct contact with the polarizer 10 shown in FIG. It is preferable to form the protective layers 17, 18 by providing a composition containing a resin material constituting the protective layers 17, 18 so as to fill the difference in thickness with the region 12.

(Optical laminate (4))
The optical laminate 45 shown in FIG. 8 has protective layers 17 and 18 on both sides of the polarizer composite 41 shown in FIG. 4(a). The optical laminate 45 may have the protective layer 17 (or 18) only on one side of the polarizer composite 41. The protective layers 17 and 18 can be provided on the polarizer composite 41 via a bonding layer such as an adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizer composite 41 via a bonding layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composite 41 is, for example, a bonding layer provided so as to fill the internal spaces of the cells 51 of the reinforcing material 50 and the gaps between the plurality of cells 51. , a protective layer may be laminated. Alternatively, by laminating on the reinforcing material 50 a laminated sheet in which a coating layer of a material serving as a bonding layer is formed on one side of a film-like protective layer, the inner spaces of the cells 51 of the reinforcing material 50 and the plurality of A protective layer may be formed by filling the gaps between the cells 51 with a material that will become a bonding layer. Further, although FIG. 8 shows a case in which a reinforcing material is provided on one side of the polarizer 10, the reinforcing material 50 may be provided on both surfaces of the polarizer 10.

The protective layers 17 and 18 may be provided in direct contact with the polarizer composite 41 without interposing the bonding layer. The protective layer 17 provided on the polarizer 10 side of the polarizer composite 41 can be formed by, for example, applying a composition containing a resin material constituting the protective layer 17 onto the polarizer 10 of the polarizer composite 41, and applying this coating. The layer can be formed by solidifying or curing the layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composite 41 is made of resin constituting the protective layer 18 so as to fill the internal spaces of the cells 51 of the reinforcing material 50 and the gaps between the plurality of cells 51. A composition containing the material may be provided to fill and form the protective layer 18.

One of the protective layers 17 and 18 may be a protective layer provided through a bonding layer, and the other may be a protective layer provided without a bonding layer. The protective layers 17 and 18 included in the optical laminate 44 may be the same or different from each other.

(protective layer)
The protective layers 17 and 18 are preferably resin layers that can transmit light, and may be resin films or coating layers formed by applying a composition containing a resin material. The resin used in the resin layer is preferably a thermoplastic resin that has excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, stretchability, and the like. Examples of the thermoplastic resin include thermoplastic resins that constitute the base film that may be used for manufacturing the raw material polarizer 20 described above. When the optical laminates 42 to 45 have protective layers 17 and 18 on both sides, the resin compositions of the protective layers 17 and 18 may be the same or different.

From the viewpoint of thinning, the thickness of the protective layers 17, 18 is usually 200 μm or less, preferably 150 μm or less, more preferably 100 μm or less, and may be 80 μm or less, or may be 60 μm or less. The thickness of the protective layers 17, 18 is usually 5 μm or more, may be 10 μm or more, or may be 20 μm or more. The protective layers 17, 18 may or may not have a phase difference. When the optical laminates 42 to 45 have the protective layers 17, 18 on both sides, the thicknesses of the protective layers 17, 18 may be the same as each other or may be different from each other.

(Lamination layer)
The bonding layer is a pressure-sensitive adhesive layer or an adhesive layer. Examples of the adhesive for forming the adhesive layer and the adhesive for forming the adhesive layer include the adhesives and adhesives used for forming the above-described filler.

<Laminated body having a lamination layer for optical display element>
The polarizer 10 shown in FIGS. 1(b) to 1(d), the polarizer composite 41 shown in FIG. 4(a), and the optical laminates 42 to 45 shown in FIGS. It may have a bonding layer for an optical display element for bonding to an optical display element (liquid crystal panel, organic EL element) of a display device such as an EL display device.

In the polarizer 10, the polarizer composite 41, and the optical laminates 42 to 45, there is a difference in thickness between the polarizing region 11 and the non-polarizing region 12, as in the polarizer 10 shown in FIG. 1(c) or (d). When providing a bonding layer for an optical display element on the resulting surface, it is preferable to provide the bonding layer for an optical display element so as to fill this thickness difference.

In the polarizer composite 41 and the optical laminates 43 and 45, when an optical display element bonding layer is provided on the surface of the reinforcing material 50, the optical display element bonding layer is formed as a filler provided in the reinforcing material 50. Filling the inner spaces of the cells 51 of the reinforcing material 50 with the filler and forming the bonding layer for an optical display element may be performed at the same time.

10 polarizer, 11 polarizing region, 11m first plane, 11n second plane, 12 non-polarizing region, 17, 18 protective layer, 20 raw material polarizer, 21 perforated polarizer, 22 through hole, 25 first support layer, 26 second support layer, 31 first laminate, 32 through hole, 33 second laminate, 41 polarizer composite, 42 to 45 optical laminate, 50 reinforcing material, 51 cell, 53 cell partition.

Claims (13)

An optical laminate having a protective layer on at least one side of a polarizer composite,
The polarizer composite includes a polarizer and a reinforcing material provided on one side of the polarizer,
The polarizer is
comprising a polarizing region and a non-polarizing region surrounded by the polarizing region in plan view,
The thickness of the polarizing region is 15 μm or less,
The non-polarizing region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in a plan view ,
The reinforcing material has a plurality of cells arranged such that each opening end face faces the surface of the polarizer,
The protective layer is a resin film with a thickness of 20 μm or more, covers the entire surface of one side of the polarizer, and is provided on the polarizer only via an adhesive layer or an adhesive layer ,
The optical laminate, wherein the opening of the cell has a polygonal shape, a circular shape, or an elliptical shape. An optical laminate having a protective layer on at least one side of a polarizer composite,
The polarizer composite includes a polarizer and a reinforcing material provided on one side of the polarizer,
The polarizer is
comprising a polarizing region and a non-polarizing region surrounded by the polarizing region in plan view,
The thickness of the polarizing region is 15 μm or less,
The non-polarizing region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in a plan view,
The reinforcing material has a plurality of cells arranged such that each opening end face faces the surface of the polarizer,
The protective layer is a resin film with a thickness of 20 μm or more, covers the entire surface of one side of the polarizer, and is provided on the polarizer only via an adhesive layer or an adhesive layer,
Furthermore, an optical laminate, wherein a translucent filler is provided in the inner space of the cell. The optical laminate according to claim 2, wherein the opening of the cell has a polygonal shape, a circular shape, or an elliptical shape. An optical laminate having a protective layer on at least one side of a polarizer composite,
The polarizer composite includes a polarizer and a reinforcing material provided on one side of the polarizer,
The polarizer is
comprising a polarizing region and a non-polarizing region surrounded by the polarizing region in plan view,
The thickness of the polarizing region is 15 μm or less,
The non-polarizing region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in a plan view,
The reinforcing material has a plurality of cells arranged such that each open end face faces the surface of the polarizer, and is provided such that the cells are present on the entire surface of one side of the polarizer. ,
The protective layer is a resin film having a thickness of 20 μm or more, and is an optical laminate that covers the entire surface of one side of the polarizer and is provided on the polarizer through an adhesive layer or only an adhesive layer. body. The optical laminate according to claim 4, wherein the opening of the cell has a polygonal shape, a circular shape, or an elliptical shape. The optical laminate according to claim 4 or 5, further comprising a translucent filler provided in the inner space of the cell. The optical laminate according to claim 1, wherein the thickness of the cured product is the same as the thickness of the polarizing region. The optical laminate according to claim 1, wherein the thickness of the cured product is smaller than the thickness of the polarizing region. The optical laminate according to any one of claims 1 to 6 , wherein the thickness of the cured product is greater than the thickness of the polarizing region. The optical laminate according to any one of claims 1 to 9 , wherein the non-polarizing region has translucency. The optical laminate according to any one of claims 1 to 10 , wherein the non-polarizing region has a diameter in a plan view of 0.5 mm or more and 20 mm or less. The optical laminate according to any one of claims 1 to 11 , wherein the active energy ray-curable resin contains an epoxy compound. The optical laminate according to claim 12 , wherein the epoxy compound includes an alicyclic epoxy compound.

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