JP5864342B2 - Resist composition and method for producing resist pattern - Google Patents

Description

  The present invention relates to a resist composition, a method for producing a resist pattern using the resist composition, and the like.

Patent Document 1 describes a resist composition comprising a resin composed of the following structural units, an acid generator, a basic compound, and a solvent.

JP 2009-62491 A

  A resist pattern formed from a conventional resist composition may not always satisfy CD uniformity.

［式（Ｉ）中、
環Ｔ^１は、置換基を有していてもよい炭素数３〜３４のスルトン環を表す。
Ｚ^１は、置換基を有していてもよい炭素数１〜６のアルカンジイル基又は式（ａ−１）で表される基

（式（ａ−１）中、
ｓは０又は１の整数を表す。
Ｘ¹⁰及びＸ^1１は、それぞれ独立に、酸素原子、イミノ基、カルボニル基、カルボニルオキシ基、オキシカルボニル基、カルボニルイミノ基又はイミノカルボニル基を表す。
Ａ¹⁰、Ａ^1１及びＡ¹²はそれぞれ独立に、置換基を有していてもよい炭素数１〜５の２価の脂肪族炭化水素基を表す。ただし、Ａ¹⁰、Ａ¹¹及びＡ¹²の炭素数の合計は６以下である。）
を表す。
Ｚ^２は、単結合又はカルボニル基を表す。
Ｒ^１は、ハロゲン原子を有してもよい炭素数１〜６のアルキル基、水素原子又はハロゲン原子を表す。］

［式（ＩＩ）中、
Ｒ^２及びＲ^３は、それぞれ独立に、炭素数１〜１２の炭化水素基、炭素数１〜６のアルコキシ基、炭素数２〜７のアシル基、炭素数２〜７のアシルオキシ基、炭素数２〜７のアルコキシカルボニル基、ニトロ基又はハロゲン原子を表す。
ｍ及びｎは、それぞれ独立に、０〜４の整数を表し、ｍが２以上の場合、複数のＲ^１は同一又は相異なり、ｎが２以上の場合、複数のＲ^２は同一又は相異なる。］
［２］環Ｔ^１が、多環式のスルトン環である［１］記載のレジスト組成物。
［３］環Ｔ^１が、式（Ｔ１）で表される環である［１］又は［２］記載のレジスト組成物。

［式（Ｔ１）中、
Ｒ^４は、ハロゲン原子又はヒドロキシ基を有していてもよい炭素数１〜１２のアルキル基、ハロゲン原子、ヒドロキシ基、オキシ基、シアノ基、炭素数１〜１２のアルコキシ基、炭素数６〜１２のアリール基、炭素数７〜１２のアラルキル基、グリシジルオキシ基、炭素数２〜１２のアルコキシカルボニル基あるいは炭素数２〜４のアシル基を表す。
ｔは、０〜９の整数を表し、ｔが２以上のとき、複数のＲ⁴は同一又は相異なる。
＊は、酸素原子との結合手を表す。］
［４］式（Ｉ）におけるＺ^２が、カルボニル基である［１］〜［３］のいずれか記載のレジスト組成物。
［５］式（Ｉ）におけるＺ^１が、メチレン基である［１］〜［４］のいずれか記載のレジスト組成物。
［６］さらに溶剤を含有する上記［１］〜［５］のいずれか記載のレジスト組成物。
［７］（１）上記［１］〜［６］のいずれか記載のレジスト組成物を基板上に塗布する工程、
（２）塗布後の組成物を乾燥させて組成物層を形成する工程、
（３）組成物層を露光する工程、
（４）露光後の組成物層を加熱する工程及び
（５）加熱後の組成物層を現像する工程を含むレジストパターンの製造方法。 The present invention includes the following inventions.
[1] (A) a resin having a structural unit represented by formula (I), insoluble or hardly soluble in an alkaline aqueous solution, and soluble in an alkaline aqueous solution by the action of an acid;
A resist composition containing (B) an acid generator and (D) a compound represented by formula (II).

[In the formula (I),
Ring T ¹ represents a C3-C34 sultone ring which may have a substituent.
Z ¹ is an alkanediyl group having 1 to 6 carbon atoms which may have a substituent or a group represented by the formula (a-1)

(In the formula (a-1),
s represents an integer of 0 or 1.
X ¹⁰ and X ¹¹ each independently represent an oxygen atom, an imino group, a carbonyl group, a carbonyloxy group, an oxycarbonyl group, a carbonylimino group or an iminocarbonyl group.
A ¹⁰ , A ¹¹ and A ¹² each independently represent a C 1-5 divalent aliphatic hydrocarbon group which may have a substituent. However, the total number of carbon atoms of A ¹⁰ , A ¹¹ and A ¹² is 6 or less. )
Represents.
Z ² represents a single bond or a carbonyl group.
R ¹ represents a C 1-6 alkyl group, a hydrogen atom or a halogen atom which may have a halogen atom. ]

[In the formula (II),
R ² and R ³ are each independently a hydrocarbon group having 1 to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyl group having 2 to 7 carbon atoms, an acyloxy group having 2 to 7 carbon atoms, or a carbon number. Represents 2 to 7 alkoxycarbonyl groups, nitro groups or halogen atoms.
m and n each independently represents an integer of 0 to 4, and when m is 2 or more, the plurality of R ¹ are the same or different, and when n is 2 or more, the plurality of R ² are the same or different. . ]
[2] The resist composition according to [1], wherein the ring T ¹ is a polycyclic sultone ring.
[3] The resist composition according to [1] or [2], wherein the ring T ¹ is a ring represented by the formula (T1).

[In the formula (T1),
R ⁴ is a C 1-12 alkyl group optionally having a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, an oxy group, a cyano group, a C 1-12 alkoxy group, a C 6-12 12 represents an aryl group having 12 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, or an acyl group having 2 to 4 carbon atoms.
t represents an integer of 0 to 9, and when t is 2 or more, the plurality of R ⁴ are the same or different.
* Represents a bond with an oxygen atom. ]
[4] The resist composition according to any one of [1] to [3], wherein Z ² in formula (I) is a carbonyl group.
[5] The resist composition according to any one of [1] to [4], wherein Z ¹ in formula (I) is a methylene group.
[6] The resist composition according to any one of [1] to [5], further containing a solvent.
[7] (1) A step of applying the resist composition according to any one of [1] to [6] on a substrate,
(2) The process of drying the composition after application | coating and forming a composition layer,
(3) a step of exposing the composition layer,
(4) A method for producing a resist pattern, comprising: a step of heating the composition layer after exposure; and (5) a step of developing the composition layer after heating.

  According to the resist composition of the present invention, a resist pattern with good CD uniformity can be produced.

In this specification, "(meth) acrylic monomer" means at least one monomer having the structure of "CH ₂ = CH-CO-" or _{"CH 2 = C (CH 3)} -CO- " To do. Similarly, “(meth) acrylate” and “(meth) acrylic acid” mean “at least one of acrylate and methacrylate” and “at least one of acrylic acid and methacrylic acid”, respectively.

<Resist composition>
The resist composition of the present invention comprises:
(A) Resin having a structural unit represented by the formula (I), insoluble or hardly soluble in an alkaline aqueous solution, and soluble in an alkaline aqueous solution by the action of an acid (hereinafter sometimes referred to as “resin (A)”) ),
(B) an acid generator (hereinafter sometimes referred to as “acid generator (B)”) and (D) a compound represented by the formula (II).
It is preferable that the resist composition of the present invention further contains a solvent (E).

［式（Ｉ）中、
環Ｔ^１は、置換基を有していてもよい炭素数３〜３４のスルトン環を表す。
Ｚ^１は、置換基を有していてもよい炭素数１〜６のアルカンジイル基又は式（ａ−１）で表される基

（式（ａ−１）中、
ｓは０又は１の整数を表す。
Ｘ¹⁰及びＸ^1１は、それぞれ独立に、酸素原子、イミノ基、カルボニル基、カルボニルオキシ基、オキシカルボニル基、カルボニルイミノ基又はイミノカルボニル基を表す。
Ａ¹⁰、Ａ^1１及びＡ¹²はそれぞれ独立に、置換基を有していてもよい炭素数１〜５の２価の脂肪族炭化水素基を表す。ただし、Ａ¹⁰、Ａ¹¹及びＡ¹²の炭素数の合計は６以下である。）
を表す。
Ｚ^２は、単結合又はカルボニル基を表す。
Ｒ^１は、ハロゲン原子を有してもよい炭素数１〜６のアルキル基、水素原子又はハロゲン原子を表す。］ <Resin (A)>
The resin (A) has a structural unit represented by the formula (I) (hereinafter sometimes referred to as “structural unit (I)”).

[In the formula (I),
Ring T ¹ represents a C3-C34 sultone ring which may have a substituent.
Z ¹ is an alkanediyl group having 1 to 6 carbon atoms which may have a substituent or a group represented by the formula (a-1)

(In the formula (a-1),
s represents an integer of 0 or 1.
X ¹⁰ and X ¹¹ each independently represent an oxygen atom, an imino group, a carbonyl group, a carbonyloxy group, an oxycarbonyl group, a carbonylimino group or an iminocarbonyl group.
A ¹⁰ , A ¹¹ and A ¹² each independently represent a C 1-5 divalent aliphatic hydrocarbon group which may have a substituent. However, the total number of carbon atoms of A ¹⁰ , A ¹¹ and A ¹² is 6 or less. )
Represents.
Z ² represents a single bond or a carbonyl group.
R ¹ represents a C 1-6 alkyl group, a hydrogen atom or a halogen atom which may have a halogen atom. ]

Further, the resin (A) is a resin that is insoluble or hardly soluble in an alkaline aqueous solution and becomes soluble in an alkaline aqueous solution by the action of an acid. Here, “being soluble in an alkaline aqueous solution by the action of an acid” means that the resin (A) has an acid labile group (hereinafter sometimes referred to as “acid labile group”), It is insoluble or hardly soluble in the aqueous alkali solution before contact with the water, but it becomes soluble in the aqueous alkali solution after contact with the acid. Therefore, the resin (A) is a monomer having only one or more structural units (I) and having an acid labile group (hereinafter sometimes referred to as “acid labile monomer (a1)”). It is preferable that it is resin containing the derived structural unit.
The resin (A) may contain a structural unit other than the structural unit derived from the structural unit (I) and the acid labile monomer (a1). Examples of such a structural unit include a structural unit derived from a monomer having no acid-labile group (hereinafter sometimes referred to as “acid-stable monomer”), a monomer known in the art, and the like.

スルトン環が有していてもよい置換基としては、ハロゲン原子又はヒドロキシ基を有していてもよい炭素数１〜１２のアルキル基、ハロゲン原子、ヒドロキシ基、オキシ基、シアノ基、炭素数１〜１２のアルコキシ基、炭素数６〜１２のアリール基、炭素数７〜１２のアラルキル基、グリシジルオキシ基、炭素数２〜１２のアルコキシカルボニル基あるいは炭素数２〜４のアシル基等が挙げられる。 <Structural unit represented by formula (I)>
The sultone ring in the ring T ¹ of the formula (I) refers to a ring containing —SO ₂ —O— as an atomic group constituting the ring.
As the sultone ring, for example, a compound represented by any one of the following formula (T ¹ -1), formula (T ¹ -2), formula (T ¹ -3) and formula (T ¹ -4) is constituted. In this structure, one of the hydrogen atoms to be replaced is replaced with a bond. The sultone ring may be monocyclic but is preferably polycyclic. The polycyclic sultone ring refers to a bridged ring containing —SO ₂ —O— as an atomic group constituting the ring. Incidentally, sultone ring, as the ring represented by the formula (T 1 ^-2), as an atomic group forming a ring, other than -SO 2 _-O-, may contain a further hetero atom. Examples of the hetero atom include an oxygen atom, a sulfur atom, and a nitrogen atom, and among them, an oxygen atom is preferable.

Examples of the substituent that the sultone ring may have include an alkyl group having 1 to 12 carbon atoms that may have a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, an oxy group, a cyano group, and 1 carbon atom. -12 alkoxy group, C6-C12 aryl group, C7-C12 aralkyl group, glycidyloxy group, C2-C12 alkoxycarbonyl group or C2-C4 acyl group. .

Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group.
Examples of the alkyl group having a halogen atom include trifluoromethyl group, perfluoroethyl group, perfluoropropyl group, perfluoroisopropyl group, perfluorobutyl group, perfluorosec-butyl group, perfluorotert-butyl group, perfluoropentyl group, perfluorohexyl group, A trichloromethyl group, a tribromomethyl group, a triiodomethyl group, etc. are mentioned.
Examples of the alkyl group having a hydroxy group include a hydroxymethyl group and a 2-hydroxyethyl group.
Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, decyloxy group and dodecyloxy group.
Aryl groups include phenyl, naphthyl, anthryl, p-methylphenyl, p-tert-butylphenyl, p-adamantylphenyl, tolyl, xylyl, cumenyl, mesityl, biphenyl, phenanthryl. Group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl and the like.
Examples of the aralkyl group include a benzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group, and a naphthylethyl group.
Examples of the alkoxycarbonyl group include groups in which a carbonyl group is further bonded to an alkoxy group such as a methoxycarbonyl group or an ethoxycarbonyl group.
Examples of the acyl group include an acetyl group, a propionyl group, and a butyryl group.

As a substituent in the ring represented by the formula (T ¹ -1) to the formula (T ¹ -4), the alkyl group is preferably an alkyl group having 1 to 6 carbon atoms, and is preferably a methyl group.
The alkyl group having a halogen atom or a hydroxy group is preferably a hydroxymethyl group, a hydroxyethyl group, a trifluoromethyl group, or the like.
The alkoxycarbonyl group preferably has 6 or less carbon atoms, and more preferably a methoxycarbonyl group.
From the viewpoint of easy production of a compound capable of deriving the structural unit (I), a sultone ring having no substituent is preferable as the sultone ring.

［式（Ｔ１’）中、
Ｚ¹²は、酸素原子、硫黄原子又はメチレン基を表す。
Ｒ^４1は、ハロゲン原子又はヒドロキシ基を有していてもよい炭素数１〜１２のアルキル基、ハロゲン原子、ヒドロキシ基、オキシ基、シアノ基、炭素数１〜１２のアルコキシ基、炭素数６〜１２のアリール基、炭素数７〜１２のアラルキル基、グリシジルオキシ基、炭素数２〜１２のアルコキシカルボニル基あるいは炭素数２〜４のアシル基を表す。
ｔａは、０〜９の整数を表し、ｔａが２以上のとき、複数のＲ^4１は同一又は相異なる。
＊は、酸素原子との結合手を表す。］ T ¹ is preferably a group represented by the following formula (T1 ′).

[In the formula (T1 ′),
Z ¹² represents an oxygen atom, a sulfur atom or a methylene group.
R ⁴¹ is an alkyl group having 1 to 12 carbon atoms which may have a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, an oxy group, a cyano group, an alkoxy group having 1 to 12 carbon atoms, or 6 to 6 carbon atoms. 12 represents an aryl group having 12 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, or an acyl group having 2 to 4 carbon atoms.
ta represents an integer of 0 to 9, and when ta is 2 or more, the plurality of R ⁴¹ are the same or different.
* Represents a bond with an oxygen atom. ]

［式（Ｔ１）中、
Ｒ^４は、ハロゲン原子又はヒドロキシ基を有していてもよい炭素数１〜１２のアルキル基、ハロゲン原子、ヒドロキシ基、オキシ基、シアノ基、炭素数１〜１２のアルコキシ基、炭素数６〜１２のアリール基、炭素数７〜１２のアラルキル基、グリシドジルオキシ基、炭素数２〜１２のアルコキシカルボニル基あるいは炭素数２〜４のアシル基を表す。
ｔは、０〜９の整数を表し、ｔが２以上のとき、複数のＲ⁴は同一又は相異なる。
＊は、酸素原子との結合手を表す。］ Z ¹² is preferably an oxygen atom or a methylene group, more preferably a methylene group. That is, as T ¹ , a group represented by the formula (T1) is more preferable.

[In the formula (T1),
R ⁴ is a C 1-12 alkyl group optionally having a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, an oxy group, a cyano group, a C 1-12 alkoxy group, a C 6-12 It represents a 12 aryl group, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, or an acyl group having 2 to 4 carbon atoms.
t represents an integer of 0 to 9, and when t is 2 or more, the plurality of R ⁴ are the same or different.
* Represents a bond with an oxygen atom. ]

  Ta in the formula (T1 ′) and t in the formula (T1) are preferably 0 or 1, and more preferably 0.

Examples of the formula (T1 ′) and the formula (T1) include the following groups.

Examples of the alkanediyl group of Z ¹ include a methylene group, an ethylene group, a propane-1,3-diyl group, a propane-1,2-diyl group, a butane-1,4-diyl group, and a pentane-1,5-diyl group. , A straight-chain alkanediyl group such as hexane-1,6-diyl group; 1-methylbutane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2- Examples thereof include branched alkanediyl groups such as diyl group, pentane-1,4-diyl group and 2-methylbutane-1,4-diyl group.
Examples of the substituent for the alkanediyl group of Z ¹ include a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. Examples of the alkoxy group include the same groups as described above.

The group (a-1) includes an atom or an atomic group such as an oxygen atom, an imino group, a carbonyl group, a carbonyloxy group, an oxycarbonyl group, a carbonylimino group, or an iminocarbonyl group, as in X ¹⁰ and X ¹¹ .
Examples of the divalent aliphatic hydrocarbon group for A ¹⁰ , A ^11, and A ¹² include alkanediyl groups. Examples of the alkanediyl group include the same ones as described above. Examples of the substituent in the divalent aliphatic hydrocarbon group include a hydroxy group and an alkoxy group having 1 to 6 carbon atoms.

Specific examples of the group (a-1) are shown below. In the following groups, the right and left are described in accordance with the formula (I), and are bonded to the S atom on the left side and to Z ² on the right side.

などが挙げられる。 As the group (a-1) having an oxygen atom,

Etc.

などが挙げられる。 As the group (a-1) having an imino group,

Etc.

などが挙げられる。 As the group (a-1) having a carbonyl group,

Etc.

などが挙げられる。 As the group (a-1) having a carbonyloxy group,

Etc.

などが挙げられる。 As the group (a-1) having an oxycarbonyl group,

Etc.

などが挙げられる。 As the group (a-1) having a carbonylimino group,

Etc.

などが挙げられる。 As the group (a-1) having an iminocarbonyl group,

Etc.

In the structural unit (I), Z ¹ is preferably an alkanediyl group having 1 to 6 carbon atoms, more preferably an alkanediyl group having 1 to 4 carbon atoms, and further preferably a methylene group.
Z ² is preferably a carbonyl group.
R ¹ is preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, more preferably a hydrogen atom or a methyl group.

Specific examples of the structural unit (I) are shown below.

式（ａａ−１）〜式（ａａ−２４）のいずれかで表される構造単位（Ｉ）の具体例において、Ｒ^１に相当するメチル基が水素原子に置き換わった構造単位も、構造単位（Ｉ）の具体例として挙げることができる。

In the specific example of the structural unit (I) represented by any one of the formulas (aa-1) to (aa-24), the structural unit in which the methyl group corresponding to R ¹ is replaced with a hydrogen atom is also a structural unit ( Specific examples of I) can be mentioned.

［式（Ｉ’）中の符号はいずれも、前記と同義である。］ The structural unit (I) is derived from a compound represented by the following formula (I ′) (hereinafter sometimes referred to as “compound (I ′)”).

[All of the symbols in formula (I ′) are as defined above. ]

Compound (I ′) can be produced by the following production method or a method analogous thereto.
Among the compounds (I ′), the compound (aa1) in which Z ² is a carbonyl group is obtained by combining a compound represented by the formula (aa1-a) and a compound represented by the formula (aa1-b) with a dehydrating binder. And it can obtain by making it react in a solvent in presence of a base catalyst.
The dehydrating binder used here is preferably 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride. As the base catalyst, dimethylaminopyridine is preferably used. Tetrahydrofuran is preferably used as the solvent.

As the compound (aa1-b), in the compounds represented by any one of the above formulas (T ¹ -1) to (T ¹ -4), one of the hydrogen atoms constituting these compounds is a hydroxy group. Examples include substituted compounds. Thus, if compound (aa1-b) is selected, compound (I ') which has various sultone rings can be manufactured.
As typical examples of the compound (aa1-b), those readily available from the market are exemplified.

式（ａａ１−ｃ）で表される化合物としては、チオグリコール酸などが挙げられる。このチオグリコール酸は市場から容易に入手できる。
式（ａａ１−ｄ）で表される化合物としては、無水メタクリル酸などが挙げられる。この無水メタクリル酸は市場から容易に入手できる。 Compound (aa1-a) can be produced by a known method. For example, the method of making the compound represented by a formula (aa1-c) and the compound represented by a formula (aa1-d) react in a solvent in presence of a base catalyst can be mentioned. The base catalyst used here is preferably triethylamine or dimethylaminopyridine, and the solvent is preferably acetonitrile.

Examples of the compound represented by the formula (aa1-c) include thioglycolic acid. This thioglycolic acid is readily available from the market.
Examples of the compound represented by the formula (aa1-d) include methacrylic anhydride. This methacrylic anhydride is readily available from the market.

Various compounds (I ′) can be produced from the production method as described above. Examples of compound (I ′) include the following compounds.

  The content of the structural unit (I) is preferably in the range of 2 to 40 mol%, more preferably in the range of 3 to 35 mol%, with respect to the total structural units (100 mol%) of the resin (A). The range of 30 mol% is more preferable. The resin (A) having the structural unit (I) in such a content ratio is produced by adjusting the molar amount of the compound (I ′) used relative to the total molar amount of all monomers used in the production of the resin (A2). Can do.

<Monomer (a1) having an acid labile group>
The “acid-labile group” means a group having a leaving group and leaving the leaving group upon contact with an acid to form a hydrophilic group (for example, a hydroxy group or a carboxy group). Examples of the acid labile group include a group represented by the formula (1) and a group represented by the formula (2).

［式（１）中、Ｒ^a1〜Ｒ^a3は、それぞれ独立に、炭素数１〜８のアルキル基又は炭素数３〜２０の脂環式炭化水素基を表すか、Ｒ^a1及びＲ^a2は互いに結合して炭素数２〜２０の２価の炭化水素基を形成する。＊は結合手を表す。］

［式（２）中、Ｒ^ａ１’及びＲ^ａ２’は、それぞれ独立に、水素原子又は炭素数１〜１２の炭化水素基を表し、Ｒ^ａ３’は、炭素数１〜２０の炭化水素基を表すか、Ｒ^ａ２’及びＲ^ａ３’は互いに結合して炭素数２〜２０の２価の炭化水素基を形成し、該炭化水素基及び該２価の炭化水素基に含まれる−ＣＨ_２−は、−Ｏ−又は−Ｓ−で置き換わってもよい。］

In Expression (1), R ^a1 ~R ^a3 each independently represent a cycloaliphatic hydrocarbon radical of the alkyl group or 3 to 20 carbon atoms having 1 to 8 carbon atoms, R ^a1 and R ^a2 are each Bonding to form a divalent hydrocarbon group having 2 to 20 carbon atoms. * Represents a bond. ]

[In formula (2), R ^{a1 ′} and R ^{a2 ′} each independently represent a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, and R ^{a3 ′} represents a hydrocarbon group having 1 to 20 carbon atoms. R ^{a2 ′} and R ^{a3 ′} are bonded to each other to form a divalent hydrocarbon group having 2 to 20 carbon atoms, and —CH ₂ — contained in the hydrocarbon group and the divalent hydrocarbon group. May be replaced by -O- or -S-. ]

式（１）においては、Ｒ^a1〜Ｒ^a3の脂環式炭化水素基は、好ましくは炭素数３〜１６である。 ^Examples of the alkyl group represented by R ^{a1 to} R ^a3 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group.
The alicyclic hydrocarbon group may be monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclopentyl group, a cyclohexyl group, a methylcyclohexyl group, and dimethylcyclohexane. Examples thereof include a cycloalkyl group such as a hexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, a norbornyl group, a methylnorbornyl group, and the following groups.

In Formula (1), the alicyclic hydrocarbon group of R ^{a1 to} R ^a3 preferably has 3 to 16 carbon atoms.

Examples of —C (R ^a1 ) (R ^a2 ) (R ^a3 ) in the case where R ^a1 and R ^a2 are bonded to each other to form a divalent hydrocarbon group include the following groups. The divalent hydrocarbon group preferably has 3 to 12 carbon atoms.

Examples of the acid labile group represented by the formula (1) include a 1,1-dialkylalkoxycarbonyl group (in the formula (1), R ^{a1 to} R ^a3 are alkyl groups, preferably tert- Butoxycarbonyl group), 2-alkyladamantan-2-yloxycarbonyl group (in the formula (1), R ^a1 , R ^a2 and a carbon atom form an adamantyl group, and R ^a3 is an alkyl group) and 1- (Adamantan-1-yl) -1-alkylalkoxycarbonyl group (in the formula (1), R ^a1 and R ^a2 are alkyl groups, and R ^a3 is an adamantyl group).

Examples of the hydrocarbon group of R ^{a1 ′ to} R ^{a3 ′} include an alkyl group, an alicyclic hydrocarbon group, and an aromatic hydrocarbon group as described above.
Examples of the alkyl group and alicyclic hydrocarbon group are the same as those described above.
Aromatic hydrocarbon groups include phenyl, naphthyl, anthryl, p-methylphenyl, p-tert-butylphenyl, p-adamantylphenyl, tolyl, xylyl, cumenyl, mesityl, biphenyl Groups, phenanthryl groups, 2,6-diethylphenyl groups, aryl groups such as 2-methyl-6-ethylphenyl, and the like.

In the formula (2), it is preferable that at least one of R ^{a1 ′} and R ^{a2 ′} is a hydrogen atom.
Specific examples of the group represented by the formula (2) include the following groups.

  The acid labile monomer (a1) is preferably a monomer having an acid labile group and a carbon-carbon double bond, more preferably a (meth) acrylic monomer having an acid labile group.

  Of the (meth) acrylic monomers having an acid labile group, those having an alicyclic hydrocarbon group having 5 to 20 carbon atoms are preferred. If a resin obtained by polymerizing an acid labile monomer (a1) having a bulky structure such as an alicyclic hydrocarbon group is used, the resolution of the resist can be improved.

  As a structural unit derived from a (meth) acrylic monomer having an acid labile group and an alicyclic hydrocarbon group, the structural unit represented by the formula (a1-1) or the formula (a1-2) The structural unit represented by these is mentioned. These may be contained alone or in combination of two or more.

［式（ａ１−１）及び式（ａ１−２）中、
Ｌ^a1及びＬ^a2は、それぞれ独立に、−Ｏ−又は^＊−Ｏ−（ＣＨ₂）_k1−ＣＯ−Ｏ−を表し、ｋ１は１〜７の整数を表し、＊は−ＣＯ−との結合手を表す。
Ｒ^a4及びＲ^a5は、それぞれ独立に、水素原子又はメチル基を表す。
Ｒ^a6及びＲ^a7は、それぞれ独立に、炭素数１〜８のアルキル基又は炭素数３〜１０の脂環式炭化水素基を表す。
ｍ１は０〜１４の整数を表す。
ｎ１は０〜１０の整数を表す。
ｎ１’は０〜３の整数を表す。］

[In Formula (a1-1) and Formula (a1-2),
L ^a1 and L ^a2 each independently represent —O— or ^* —O— (CH ₂ ) _k1 —CO—O—, k1 represents an integer of 1 to 7, and * represents a bond to —CO—. Represents a hand.
R ^a4 and R ^a5 each independently represent a hydrogen atom or a methyl group.
R ^a6 and R ^a7 each independently represent an alkyl group having 1 to 8 carbon atoms or an alicyclic hydrocarbon group having 3 to 10 carbon atoms.
m1 represents the integer of 0-14.
n1 represents an integer of 0 to 10.
n1 ′ represents an integer of 0 to 3. ]

ｍ１は、好ましくは０〜３の整数、より好ましくは０又は１である。
ｎ１は、好ましくは０〜３の整数、より好ましくは０又は１である。
ｎ１’は好ましくは０又は１である。 L ^a1 and L ^a2 are preferably —O— or ^* —O— (CH ₂ ) _k1 —CO—O—, more preferably —O—. k1 is preferably an integer of 1 to 4, more preferably 1.
R ^a4 and R ^a5 are preferably methyl groups.
^Examples of the alkyl group for R ^a6 and R ^a7 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. The alkyl group for R ^a6 and R ^a7 preferably has 6 or less carbon atoms.
The alicyclic hydrocarbon group for R ^a6 and R ^a7 may be monocyclic or polycyclic, and examples of the monocyclic alicyclic hydrocarbon group include a cyclopentyl group, a cyclohexyl group, Examples thereof include cycloalkyl groups such as methylcyclohexyl group, dimethylcyclohexyl group, cycloheptyl group, and cyclooctyl group. Examples of the polycyclic alicyclic hydrocarbon group include decahydronaphthyl group, adamantyl group, norbornyl group, methylnorbornyl group, and the following groups.

m1 is preferably an integer of 0 to 3, more preferably 0 or 1.
n1 is preferably an integer of 0 to 3, more preferably 0 or 1.
n1 ′ is preferably 0 or 1.

Examples of the monomer for deriving the structural unit represented by the formula (a1-1) include monomers described in JP 2010-204646 A. Monomers represented by the following formulas (a1-1-1) to (a1-1-8) are preferred, and monomers represented by the following formulas (a1-1-1) to (a1-1-4) are more preferred. .

Examples of the monomer for deriving the structural unit represented by the formula (a1-2) include 1-ethylcyclopentan-1-yl (meth) acrylate, 1-ethylcyclohexane-1-yl (meth) acrylate, 1- Examples include ethylcycloheptan-1-yl (meth) acrylate, 1-methylcyclopentan-1-yl (meth) acrylate, 1-isopropylcyclopentan-1-yl (meth) acrylate, and the like. Monomers represented by the following formulas (a1-2-1) to (a1-2-12) are preferred, and the following formulas (a1-2-3) to (a1-2-4) and the following formulas (a1-2-2) The monomers represented by 9) to (a1-2-10) are more preferable, and the monomers represented by the following formula (a1-2-3) and the following formula (a1-2-9) are more preferable.

  When the resin (A) includes a structural unit represented by the formula (a1-1) and / or a structural unit represented by the formula (a1-2), the total content thereof is the total structure of the resin (A). It is 10-95 mol% normally with respect to a unit, Preferably it is 15-90 mol%, More preferably, it is 20-85 mol%.

式（ａ１−５）中、
Ｒ^３１は、ハロゲン原子を有してもよい炭素数１〜６のアルキル基、水素原子又はハロゲン原子を表す。
Ｌ^１〜Ｌ^３は、酸素原子、硫黄原子又は^＊−Ｏ−（ＣＨ₂）_k1−ＣＯ−Ｏ−で表される基を表す。ここで、ｋ１は１〜７の整数を表し、＊はカルボニル基（−ＣＯ−）との結合手である。
Ｚ^１は、単結合又は炭素数１〜６のアルカンジイル基であり、該アルカンジイル基中に含まれるメチレン基は、オキシ基又はカルボニル基に置き換わっていてもよい。
ｓ１及びｓ１’は、それぞれ独立して、０〜４の整数を表す。 Examples of the other acid labile monomer (a1) include a monomer represented by the formula (a1-5) which is a (meth) acrylic monomer having an acid labile group (2) (hereinafter referred to as “monomer (a1-5)”. ) ”May be used.

In formula (a1-5),
R ³¹ represents a C 1-6 alkyl group which may have a halogen atom, a hydrogen atom or a halogen atom.
L ^{1 to} L ³ represent an oxygen atom, a sulfur atom, or a group represented by ^* —O— (CH ₂ ) _k1 —CO—O—. Here, k1 represents an integer of 1 to 7, and * is a bond with a carbonyl group (—CO—).
Z ¹ is a single bond or an alkanediyl group having 1 to 6 carbon atoms, and the methylene group contained in the alkanediyl group may be replaced with an oxy group or a carbonyl group.
s1 and s1 ′ each independently represents an integer of 0 to 4.

In formula (a1-5), R ³¹ is preferably a hydrogen atom, a methyl group, or a trifluoromethyl group.
L ¹ is preferably an oxygen atom.
One of L ² and L ³ is preferably an oxygen atom and the other is a sulfur atom.
s1 is preferably 1.
s1 ′ is preferably an integer of 0 to 2.
Z ¹ is preferably a single bond or —CH ₂ —CO—O—.

Examples of the monomer (a1-5) include the following monomers.

  When the resin (A) has a structural unit derived from the monomer (a1-5), the content is preferably in the range of 3 to 50 mol% with respect to the total structural unit of the resin (A), The range of 45 mol% is more preferable, and the range of 10 to 40 mol% is more preferable.

<Acid stable monomer>
As an acid stable monomer, Preferably, the monomer which has a hydroxyl group or a lactone ring is mentioned. Acid-stable monomer having a hydroxy group (hereinafter sometimes referred to as “acid-stable monomer having a hydroxy group (a2)”) or acid-stable monomer having a lactone ring (hereinafter referred to as “acid-stable monomer having a lactone ring (a3)”) If a resin having a structural unit derived from (sometimes) is used, the resolution of the resist pattern and the adhesion to the substrate can be improved.

<Acid-stable monomer having a hydroxy group (a2)>
When the resist composition is used for KrF excimer laser exposure (248 nm), high energy beam exposure such as electron beam or EUV light, the acid-stable monomer (a2) having a hydroxy group is preferably a phenolic hydroxy which is a hydroxystyrene. An acid-stable monomer having a group is used. When using short-wavelength ArF excimer laser exposure (193 nm) or the like, the acid-stable monomer (a2) having a hydroxy group is preferably an acid-stable monomer having a hydroxyadamantyl group represented by the formula (a2-1). use. The acid-stable monomer (a2) having a hydroxy group may be used alone or in combination of two or more.

式（ａ２−１）中、
Ｌ^a3は、−Ｏ−又は^＊−Ｏ−（ＣＨ₂）_k2−ＣＯ−Ｏ−を表し、
ｋ２は１〜７の整数を表す。＊は−ＣＯ−との結合手を表す。
Ｒ^a14は、水素原子又はメチル基を表す。
Ｒ^a15及びＲ^a16は、それぞれ独立に、水素原子、メチル基又はヒドロキシ基を表す。
ｏ１は、０〜１０の整数を表す。 Examples of the acid stable monomer having a hydroxyadamantyl group include a monomer represented by the formula (a2-1).

In formula (a2-1),
L ^a3 represents —O— or ^* —O— (CH ₂ ) _k2 —CO—O—,
k2 represents an integer of 1 to 7. * Represents a bond with -CO-.
R ^a14 represents a hydrogen atom or a methyl group.
R ^a15 and R ^a16 each independently represent a hydrogen atom, a methyl group or a hydroxy group.
o1 represents an integer of 0 to 10.

In the formula (a2-1), L ^a3 is preferably, -O -, - O- (CH 2) f1 -CO-O- and is (wherein f1 is an integer of 1-4), more preferably Is —O—.
R ^a14 is preferably a methyl group.
R ^a15 is preferably a hydrogen atom.
R ^a16 is preferably a hydrogen atom or a hydroxy group.
o1 is preferably an integer of 0 to 3, more preferably 0 or 1.

As an acid stable monomer (a2-1) which has a hydroxyadamantyl group, the monomer described in Unexamined-Japanese-Patent No. 2010-204646 is mentioned, for example. Monomers represented by the following formulas (a2-1-1) to (a2-1-6) are preferred, and monomers represented by the following formulas (a2-1-1) to (a2-1-4) are more preferred. A monomer represented by the following formula (a2-1-1) or (a2-1-3) is more preferable.

  When the resin (A) includes a structural unit derived from the monomer represented by the formula (a2-1), the content is usually 3 to 45 mol% with respect to all the structural units of the resin (A). , Preferably it is 3-40 mol%, More preferably, it is 3-35 mol%, More preferably, it is 3-20 mol%.

<Acid-stable monomer having a lactone ring (a3)>
The lactone ring possessed by the acid stable monomer (a3) may be, for example, a monocycle such as a β-propiolactone ring, γ-butyrolactone ring, or δ-valerolactone ring, and a monocyclic lactone ring and other rings The condensed ring may be used. Among these lactone rings, a γ-butyrolactone ring or a condensed ring of γ-butyrolactone ring and another ring is preferable.

  The acid-stable monomer (a3) having a lactone ring is preferably represented by the formula (a3-1), the formula (a3-2) or the formula (a3-3). These 1 type may be used independently and may use 2 or more types together.

式（ａ３−１）〜式（ａ３−３）中、
Ｌ^a4〜Ｌ^a6は、それぞれ独立に、−Ｏ−又は^＊−Ｏ−（ＣＨ₂）_k3−ＣＯ−Ｏ−を表す。
ｋ３は１〜７の整数を表す。＊は−ＣＯ−との結合手を表す。
Ｒ^a18〜Ｒ^a20は、それぞれ独立に、水素原子又はメチル基を表す。
Ｒ^a21は、炭素数１〜４のアルキル基を表す。
ｐ１は０〜５の整数を表す。
Ｒ^a22及びＲ^a23は、それぞれ独立に、カルボキシ基、シアノ基又は炭素数１〜４のアルキル基を表す。
ｑ１及びｒ１は、それぞれ独立に０〜３の整数を表す。ｐ１が２以上のとき、複数のＲ^a21は同一又は相異なり、ｑ１が２以上のとき、複数のＲ^a22は同一又は相異なり、ｒ１が２以上のとき、複数のＲ^a23は、同一又は相異なる。

In formula (a3-1) to formula (a3-3),
L ^{a4 to} L ^a6 each independently represent —O— or ^* —O— (CH ₂ ) _k3 —CO—O—.
k3 represents an integer of 1 to 7. * Represents a bond with -CO-.
R ^{a18 to} R ^a20 each independently represents a hydrogen atom or a methyl group.
R ^a21 represents an alkyl group having 1 to 4 carbon atoms.
p1 represents an integer of 0 to 5.
R ^a22 and R ^a23 each independently represent a carboxy group, a cyano group, or an alkyl group having 1 to 4 carbon atoms.
q1 and r1 each independently represents an integer of 0 to 3. When p1 is 2 or more, a plurality of R ^a21 are the same or different, when q1 is 2 or more, a plurality of R ^a22 are the same or different, and when r1 is 2 or more, a plurality of R ^a23 are the same or different Different.

^Examples of the alkyl group represented by R ^{a21 to} R ^a23 include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, and a sec-butyl group.

In formula (a3-1) to formula (a3-3), L ^{a4 to} L ^a6 are preferably each independently —O— or ^* —O— (CH ₂ ) _k3 —CO—O—, More preferably, it is -O-. k3 is preferably an integer of 1 to 4, more preferably 1.
R ^{a18 to} R ^a21 are preferably methyl groups.
R ^a22 and R ^a23 are each independently preferably a carboxy group, a cyano group or a methyl group.
p1 to r1 are each independently preferably 0 to 2, more preferably 0 or 1.

  Examples of the acid-stable monomer (a3) having a lactone ring include monomers described in JP 2010-204646 A. In the following formulas (a3-1-1) to (a3-1-4), (a3-2-1) to (a3-2-4), (a3-3-1) to (a3-3-4) Monomers represented by the following formulas (a3-1-1) to (a3-1-2) and (a3-2-3) to (a3-2-4) are more preferred, A monomer represented by formula (a3-1-1) or (a3-2-3) is more preferable.

  When the resin (A) includes a structural unit derived from the acid-stable monomer (a3) having a lactone ring, the content is usually 5 to 70 mol% with respect to all the structural units of the resin (A), Preferably it is 10-65 mol%, More preferably, it is 10-60 mol%.

When the resin (A) is a copolymer of an acid labile monomer (a1) and an acid stable monomer, the structural unit derived from the acid labile monomer (a1) is based on 100 mol% of all structural units. Preferably it is 10-80 mol%, More preferably, it is 20-60 mol%.
The content of the structural unit derived from the monomer having an adamantyl group (particularly the structural unit represented by the formula (a1-1)) is preferably relative to the total amount of structural units derived from the acid labile monomer (a1). 15 mol% or more. When the ratio of the structural unit having an adamantyl group is increased, the dry etching resistance of the resist pattern is improved.

  The resin (A) is preferably a copolymer of a monomer represented by the formula (I ′), an acid labile monomer (a1), and an acid stable monomer. In this copolymer, the acid labile monomer (a1) is more preferably a monomer that derives a structural unit represented by the formula (a1-1) and a structural unit represented by the formula (a1-2). It is a monomer that derives at least one monomer (preferably the monomer having a cyclohexyl group or a cyclopentyl group), more preferably a structural unit represented by the formula (a1-1). The acid stable monomer is preferably an acid stable monomer (a2) having a hydroxy group and / or an acid stable monomer (a3) having a lactone ring. The acid-stable monomer (a2) having a hydroxy group is preferably an acid-stable monomer (a2-1) having a hydroxyadamantyl group, and the acid-stable monomer (a3) having a lactone ring is more preferably a γ-butyrolactone ring. The acid-stable monomer (a3-1) and the acid-stable monomer (a3-2) having a condensed ring of a γ-butyrolactone ring and a norbornane ring.

Each structural unit constituting the resin (A) may be used alone or in combination of two or more, and is produced by a known polymerization method (for example, radical polymerization method) using a monomer that derives these structural units. can do.
The weight average molecular weight of the resin (A) is preferably 2,500 or more (more preferably 3,000 or more, more preferably 4,000 or more), 50,000 or less (more preferably 30,000 or less, and further preferably 15,000 or less).

  The resist composition of the present invention includes resins other than the resin (A) described above, for example, structural units derived from the acid labile monomer (a1) described above, structural units derived from the acid stable monomer, A resin composed of a structural unit derived from a known monomer used may be contained.

  In the resist composition of the present invention, the resin content is preferably 80% by mass or more and 99% by mass or less in the solid content of the resist composition. In the present specification, the “solid content in the composition” means the total of resist composition components excluding the solvent (E) described later. The solid content in the composition and the content of the resin (A) relative thereto can be measured, for example, by a known analysis means such as liquid chromatography or gas chromatography.

<Acid generator (B)>
The acid generator (B) is classified into a nonionic type and an ionic type, and any of them may be used in the resist composition of the present invention. Examples of the nonionic acid generator include organic halides, sulfonate esters (for example, 2-nitrobenzyl ester, aromatic sulfonate, oxime sulfonate, N-sulfonyloxyimide, N-sulfonyloxyimide, sulfonyloxyketone, diazonaphthoquinone 4). -Sulfonate), sulfones (for example, disulfone, ketosulfone, sulfonyldiazomethane) and the like. Examples of the ionic acid generator include onium salts containing onium cations (for example, diazonium salts, phosphonium salts, sulfonium salts, iodonium salts) and the like. Examples of the anion of the onium salt include a sulfonate anion, a sulfonylimide anion, and a sulfonylmethide anion.

  Examples of the acid generator (B) include JP-A 63-26653, JP-A 55-164824, JP-A 62-69263, JP-A 63-146038, JP-A 63-163452, JP-A-62-153853, JP-A-63-146029, US Pat. No. 3,779,778, US Pat. No. 3,849,137, German Patent No. 3914407, European Patent No. 126,712 The compound which generate | occur | produces an acid by the radiation as described in etc. can be used.

  The acid generator (B) is preferably a fluorine-containing acid generator, more preferably a sulfonate represented by the formula (B1).

［式（Ｂ１）中、
Ｑ¹及びＱ²は、それぞれ独立に、フッ素原子又は炭素数１〜６のペルフルオロアルキル基を表す。
Ｌ^b1は、単結合又は２価の炭素数１〜１７の飽和炭化水素基を表し、前記２価の飽和炭化水素基に含まれる−ＣＨ_２−は、−Ｏ−又は−ＣＯ−で置き換わっていてもよい。
Ｙは、置換基を有していてもよい炭素数１〜１８のアルキル基又は置換基を有していてもよい炭素数３〜１８の脂環式炭化水素基を表し、前記アルキル基及び前記脂環式炭化水素基に含まれる−ＣＨ_２−は、−Ｏ−、−ＳＯ_２−又は−ＣＯ−で置き換わっていてもよい。
Ｚ⁺は、有機カチオンを表す。］

[In the formula (B1),
Q ¹ and Q ² each independently represents a fluorine atom or a C 1-6 perfluoroalkyl group.
L ^b1 represents a single bond or a divalent saturated hydrocarbon group having 1 to 17 carbon atoms, and —CH ₂ — contained in the divalent saturated hydrocarbon group is replaced by —O— or —CO—. May be.
Y represents an alkyl group having 1 to 18 carbon atoms which may have a substituent or an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, and the alkyl group and the above —CH ₂ — contained in the alicyclic hydrocarbon group may be replaced by —O—, —SO ₂ — or —CO—.
Z ⁺ represents an organic cation. ]

Examples of the perfluoroalkyl group for Q ¹ and Q ² include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluoroisopropyl group, a perfluorobutyl group, a perfluorosec-butyl group, a perfluorotert-butyl group, and a perfluoropentyl group. And perfluorohexyl group.
In formula (B1), Q ¹ and Q ² are each independently preferably a trifluoromethyl group or a fluorine atom, more preferably a fluorine atom.

Examples of the divalent saturated hydrocarbon group for L ^b1 include a linear alkanediyl group, a branched alkanediyl group, a monocyclic or polycyclic alicyclic hydrocarbon group, and among these groups, 2 It may be a combination of more than one species.
Specifically, methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1 , 6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group , Dodecane-1,12-diyl group, tridecane-1,13-diyl group, tetradecane-1,14-diyl group, pentadecane-1,15-diyl group, hexadecane-1,16-diyl group, heptadecane-1, Linear alkanediyl groups such as 17-diyl group, ethane-1,1-diyl group, propane-1,1-diyl group and propane-2,2-diyl group;
An alkyl group (particularly an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group); For example, 1-methylbutane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4 A branched alkanediyl group such as a diyl group or 2-methylbutane-1,4-diyl group;
Monocyclic 2 which is a cycloalkanediyl group such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group Valent alicyclic hydrocarbon group;
Polycyclic divalent alicyclic hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, adamantane-2,6-diyl group and the like Etc.

Examples of the group in which —CH ₂ — contained in the saturated hydrocarbon group of L ^b1 is replaced by —O— or —CO— include formula (b1-1) to formula (b1-6). The formula (b1-1) to the formula (b1-6) are written in accordance with the formula (B1) on the left and right sides, and C (Q ¹ ) on the left side of two bonds represented by *, respectively. (Q ² ) Bonded to-and bonded to -Y on the right side. The same applies to specific examples of the following formulas (b1-1) to (b1-6).

式（ｂ１−１）〜式（ｂ１−６）中、
Ｌ^b2は、単結合又は炭素数１〜１５の２価の飽和炭化水素基を表す。
Ｌ^b3は、単結合又は炭素数１〜１２の２価の飽和炭化水素基を表す。
Ｌ^b4は、炭素数１〜１３の２価の飽和炭化水素基を表す。但しＬ^b3及びＬ^b4の炭素数上限は１３である。
Ｌ^b5は、炭素数１〜１５の２価の飽和炭化水素基を表す。
Ｌ^b6及びＬ^b7は、それぞれ独立に、炭素数１〜１５の２価の飽和炭化水素基を表す。但しＬ^b6及びＬ^b7の炭素数上限は１６である。
Ｌ^b8は、炭素数１〜１４の２価の飽和炭化水素基を表す。
Ｌ^b9及びＬ^b10は、それぞれ独立に、炭素数１〜１１の２価の飽和炭化水素基を表す。但しＬ^ｂ９及びＬ^ｂ１０の炭素数上限は１２である。
中でも、Ｌ^b1は、好ましくは式（ｂ１−１）〜式（ｂ１−４）のいずれか、より好ましくは式（ｂ１−１）又は式（ｂ１−２）、さらに好ましくは式（ｂ１−１）で表される２価の基であり、特に好ましくは、Ｌ^b2が単結合又は−ＣＨ_２−である式（ｂ１−１）で表される２価の基である。

In formula (b1-1) to formula (b1-6),
L ^b2 represents a single bond or a divalent saturated hydrocarbon group having 1 to 15 carbon atoms.
L ^b3 represents a single bond or a divalent saturated hydrocarbon group having 1 to 12 carbon atoms.
L ^b4 represents a divalent saturated hydrocarbon group having 1 to 13 carbon atoms. However, the upper limit of the carbon number of L ^b3 and L ^b4 is 13.
L ^b5 represents a divalent saturated hydrocarbon group having 1 to 15 carbon atoms.
L ^b6 and L ^b7 each independently represent a divalent saturated hydrocarbon group having 1 to 15 carbon atoms. However, the upper limit of the carbon number of L ^b6 and L ^b7 is 16.
L ^b8 represents a divalent saturated hydrocarbon group having 1 to 14 carbon atoms.
L ^b9 and L ^b10 each independently represent a divalent saturated hydrocarbon group having 1 to 11 carbon atoms. However, the upper limit of the carbon number of L ^b9 and L ^b10 is 12.
Among them, L ^b1 is preferably any one of formula (b1-1) to formula (b1-4), more preferably formula (b1-1) or formula (b1-2), and still more preferably formula (b1-1). And particularly preferably a divalent group represented by the formula (b1-1) in which L ^b2 is a single bond or —CH ₂ —.

Examples of the divalent group represented by the formula (b1-1) include the following.

Examples of the divalent group represented by the formula (b1-2) include the following.

Examples of the divalent group represented by the formula (b1-3) include the following.

Examples of the divalent group represented by the formula (b1-4) include the following.

Examples of the divalent group represented by the formula (b1-5) include the following.

Examples of the divalent group represented by the formula (b1-6) include the following.

Examples of the alkyl group for Y include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, n-hexyl group, heptyl group, 2 -Alkyl groups, such as an ethylhexyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, are mentioned, Preferably, a C1-C6 alkyl group is mentioned.
Examples of the alicyclic hydrocarbon group include groups represented by the following formulas (Y1) to (Y11).
Examples of the group in which —CH ₂ — contained in the alicyclic hydrocarbon group of Y is replaced by —O—, —SO ₂ — or —CO— are represented by formulas (Y12) to (Y26). Groups.

  Especially, it is preferably a group represented by any one of formulas (Y1) to (Y19), more preferably represented by formula (Y11), formula (Y14), formula (Y15) or formula (Y19). And more preferably a group represented by formula (Y11) or formula (Y14).

Examples of the substituent of the alkyl group and alicyclic hydrocarbon group in Y include, for example, a halogen atom, a hydroxy group, an oxo group, an alkyl group having 1 to 12 carbon atoms, a hydroxy group-containing alkyl group having 1 to 12 carbon atoms, carbon C3-C16 alicyclic hydrocarbon group, C1-C12 alkoxy group, C6-C18 aromatic hydrocarbon group, C7-C21 aralkyl group, C2-C4 acyl group , Glycidyloxy group or — (CH ₂ ) _j2 —O—CO—R ^b1 (wherein R ^b1 is an alkyl group having 1 to 16 carbon atoms, an alicyclic hydrocarbon group having 3 to 16 carbon atoms, or the number of carbon atoms) Represents an aromatic hydrocarbon group of 6 to 18. j2 represents an integer of 0 to 4).
The alkyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group, aralkyl group, and the like, which are substituents for Y, may further have a substituent. Examples of the substituent include an alkyl group, a halogen atom, a hydroxy group, and an oxo group.

Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
Examples of the hydroxy group-containing alkyl group include a hydroxymethyl group and a hydroxyethyl group.
Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, decyloxy group and dodecyloxy group.
Examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, an anthranyl group, a p-methylphenyl group, a p-tert-butylphenyl group, a p-adamantylphenyl group; a tolyl group, a xylyl group, a cumenyl group, and a mesityl group. , Aryl groups such as biphenyl group, anthryl group, phenanthryl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl, and the like.
Examples of the aralkyl group include benzyl group, phenethyl group, phenylpropyl group, trityl group, naphthylmethyl group, naphthylethyl group and the like.
Examples of the acyl group include an acetyl group, a propionyl group, and a butyryl group.

Examples of Y include the following.

When Y is an aliphatic hydrocarbon group and L ^b1 is a divalent aliphatic hydrocarbon group having 1 to 17 carbon atoms, the methylene group of the divalent aliphatic hydrocarbon group bonded to Y Is preferably replaced by an oxygen atom or a carbonyl group. In this case, the methylene group constituting the aliphatic hydrocarbon group for Y is not replaced with an oxygen atom or a carbonyl group.

  Y is preferably an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, more preferably a substituent (for example, an oxo group, a hydroxy group, etc.). A good adamantyl group, more preferably an adamantyl group, a hydroxyadamantyl group or an oxoadamantyl group.

The sulfonate anion in the salt represented by the formula (B1) is preferably an anion represented by the formula (b1-1-1) to the formula (b1-1-9). In the following formulas, the definitions of the symbols have the same meaning as described above, and the substituents R ^b2 and R ^b3 each independently represent an alkyl group having 1 to 4 carbon atoms (preferably a methyl group).
Specific examples of the sulfonate anion in the salt represented by the formula (B1) include the anions described in JP 2010-204646 A.

Examples of the cation (Z ⁺ ) contained in the salt represented by the formula (B1) include organic onium cations, such as organic sulfonium cation, organic iodonium cation, organic ammonium cation, benzothiazolium cation, and organic phosphonium cation. An organic sulfonium cation or an organic iodonium cation is preferable, and an arylsulfonium cation is more preferable.

Z ⁺ in formula (B1) is preferably represented by any of formula (b2-1) to formula (b2-4).

In formula (b2-1) to formula (b2-4),
R ^{b4 to} R ^b6 each independently represents a hydrocarbon group having 1 to 30 carbon atoms, and this hydrocarbon group is an alkyl group having 1 to 30 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. And an aromatic hydrocarbon group having 6 to 18 carbon atoms. The alkyl group may have a hydroxy group, an alkoxy group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 18 carbon atoms, and the alicyclic hydrocarbon group includes a halogen atom and a carbon number. The aromatic hydrocarbon group may have 2 to 4 acyl groups or glycidyloxy groups, and the aromatic hydrocarbon group is a halogen atom, a hydroxy group, an alkyl group having 1 to 18 carbon atoms, or an alicyclic group having 3 to 18 carbon atoms. You may have a hydrocarbon group or a C1-C12 alkoxy group. R ^b4 and R ^b5 may be combined to form a ring that may have a hetero atom.
R ^b7 and R ^b8 each independently represent a hydroxy group, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms.
m2 and n2 each independently represents an integer of 0 to 5. When m2 is 2 or more, the plurality of R ^b7 may be the same or different, and when n2 is 2 or more, the plurality of R ^b8 may be the same or different.
R ^b9 and R ^b10 each independently represent an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or R ^b9 and R ^b10 are a sulfur atom to which they are bonded. Together with each other to form a 3- to 12-membered ring (preferably a 3- to 7-membered ring). The methylene group contained in the ring may be replaced with an oxygen atom, a sulfur atom or a carbonyl group.
R ^b11 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms.
R ^b11 and R ^b12 may form a 3- to 12-membered ring (preferably a 3- to 7-membered ring) with —CH—CO— to which they are bonded. The methylene group contained in the ring may be replaced with an oxygen atom, a sulfur atom or a carbonyl group.
R ^b12 represents an alkyl group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms, and the aromatic hydrocarbon group has It may be substituted with an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or an alkylcarbonyloxy group having 1 to 12 carbon atoms.

R ^{b13 to} R ^b18 each independently represent a hydroxy group, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms.
L ^b11 represents an oxygen atom or a sulfur atom.
o2, p2, s2, and t2 each independently represents an integer of 0 to 5.
q2 and r2 each independently represents an integer of 0 to 4.
u2 represents 0 or 1.
When o2 is 2 or more, the plurality of R ^b13 may be the same or different. When p2 is 2 or more, the plurality of R ^b14 may be the same or different. When q2 is 2 or more, the plurality of R ^b15 is When r2 is 2 or more, a plurality of R ^b16 may be the same or different. When s2 is 2 or more, a plurality of R ^b17 may be the same or different, and t2 is 2 or more. Sometimes, the plurality of R ^b18 may be the same or different.

芳香族炭化水素基としては、フェニル基、ナフチル基、アントリル基、ｐ−メチルフェニル基、ｐ−ｔｅｒｔ−ブチルフェニル基、ｐ−アダマンチルフェニル基、トリル基、キシリル基、クメニル基、メシチル基、ビフェニル基、フェナントリル基、２，６−ジエチルフェニル基、２−メチル−６−エチルフェニル等のアリール基等が挙げられる。 Examples of the alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, octyl group and 2-ethylhexyl group. .
The alicyclic hydrocarbon group may be monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclopentyl group, a cyclohexyl group, a methylcyclohexyl group, and dimethylcyclohexane. Examples thereof include a cycloalkyl group such as a hexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the polycyclic alicyclic hydrocarbon group include decahydronaphthyl group, adamantyl group, norbornyl group, methylnorbornyl group, and the following groups. * Represents a bond with an adamantane ring or a cyclohexane ring.

Aromatic hydrocarbon groups include phenyl, naphthyl, anthryl, p-methylphenyl, p-tert-butylphenyl, p-adamantylphenyl, tolyl, xylyl, cumenyl, mesityl, biphenyl Groups, phenanthryl groups, 2,6-diethylphenyl groups, aryl groups such as 2-methyl-6-ethylphenyl, and the like.

Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, decyloxy group and dodecyloxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
Examples of the acyl group include an acetyl group, a propionyl group, and a butyryl group.
Examples of the alkylcarbonyloxy group include a methylcarbonyloxy group, an ethylcarbonyloxy group, an n-propylcarbonyloxy group, an isopropylcarbonyloxy group, an n-butylcarbonyloxy group, a sec-butylcarbonyloxy group, a tert-butylcarbonyloxy group, Examples thereof include a pentylcarbonyloxy group, a hexylcarbonyloxy group, an octylcarbonyloxy group, and a 2-ethylhexylcarbonyloxy group.

The ring containing a sulfur atom which R ^b4 and R ^b5 may form together may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. If it contains one or more sulfur atoms, it may further contain one or more sulfur atoms and / or one or more oxygen atoms. As the ring, a ring having 3 to 18 carbon atoms is preferable, and a ring having 4 to 13 carbon atoms is more preferable.

The alkyl group of R ^{b9 to} R ^b12 preferably has 1 to 12 carbon atoms, and in particular, a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group , A pentyl group, a hexyl group, an octyl group and a 2-ethylhexyl group are preferred.
The alicyclic hydrocarbon group of R ^{b9 to} R ^b11 preferably has 3 to 18 carbon atoms, more preferably 4 to 12 carbon atoms, and in particular, cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl. Group, cyclodecyl group, 2-alkyladamantan-2-yl group, 1- (adamantan-1-yl) alkane-1-yl group and isobornyl group are preferable.
The aromatic hydrocarbon group for R ^b12 includes a phenyl group, a 4-methylphenyl group, a 4-ethylphenyl group, a 4-tert-butylphenyl group, a 4-cyclohexylphenyl group, a 4-methoxyphenyl group, a biphenylyl group, and A naphthyl group and the like are preferable.
A group in which an aromatic hydrocarbon group of R ^b12 and an alkyl group are bonded is typically an aralkyl group.

Examples of the ring formed together with the sulfur atom to which R ^b9 and R ^b10 are bonded include, for example, a thiolane-1-ium ring (tetrahydrothiophenium ring), a thian-1-ium ring, and 1,4-oxathian-4-ium. A ring etc. are mentioned.
Examples of the ring formed with —CH—CO— in which R ^b11 and R ^b12 are bonded include an oxocycloheptane ring, an oxocyclohexane ring, an oxonorbornane ring, and an oxoadamantane ring.

Among the cations (b2-1) to (b2-4), the cation (b2-1) is preferable, and the cation represented by the formula (b2-1-1) is more preferable. Are triphenylsulfonium cations (in formula (b2-1-1), v2 = w2 = x2 = 0), diphenyltolylsulfonium cations (in formula (b2-1-1), v2 = w2 = 0, x2 = 1 And R ^b21 is a methyl group.) Or a tolylsulfonium cation (in formula (b2-1-1), v2 = w2 = x2 = 1, and R ^b19 , R ^b20 and R ^b21 are all methyl. Group.)

式（ｂ２−１−１）中、
Ｒ^b19〜Ｒ^b21は、それぞれ独立に、ハロゲン原子（より好ましくはフッ素原子）ヒドロキシ基、炭素数１〜１２のアルキル基、炭素数１〜１２のアルコキシ基又は炭素数３〜１８の脂環式炭化水素基を表す。また、Ｒ^b19〜Ｒ^b21から選ばれる２つが一緒になってヘテロ原子を有してもよい環を形成してもよい。
ｖ２、ｗ２及びｘ２は、それぞれ独立に０〜５の整数（好ましくは０又は１）を表す。
ｖ２が２以上のとき、複数のＲ^b19は同一又は相異なり、ｗ２が２以上のとき、複数のＲ^b20は同一又は相異なり、ｘ２が２以上のとき、複数のＲ^b21は同一又は相異なる。
なかでも、Ｒ^b19〜Ｒ^b21は、それぞれ独立に、好ましくは、ハロゲン原子（より好ましくはフッ素原子）、ヒドロキシ基、炭素数１〜１２のアルキル基、又は炭素数１〜１２のアルコキシ基である。

In formula (b2-1-1),
R ^{b19 to} R ^b21 are each independently a halogen atom (more preferably a fluorine atom) hydroxy group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alicyclic group having 3 to 18 carbon atoms. Represents a hydrocarbon group. It is also possible to form two of which may have a hetero atom together ring selected from R ^b19 to R ^b21.
v2, w2 and x2 each independently represent an integer of 0 to 5 (preferably 0 or 1).
When v2 is 2 or more, the plurality of R ^b19 are the same or different, when w2 is 2 or more, the plurality of R ^b20 are the same or different, and when x2 is 2 or more, the plurality of R ^b21 are the same or different. .
Among them, R ^{b19 to} R ^b21 are preferably each independently a halogen atom (more preferably a fluorine atom), a hydroxy group, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. .

Specific examples of the organic cation of Z ⁺ include cations described in JP 2010-204646 A.

  The acid generator (B1) is a combination of the above-described sulfonate anion and organic cation. The above-mentioned anion and cation can be arbitrarily combined, and preferably a combination of any one of anion (b1-1-1) to anion (b1-1-9) and cation (b2-1-1), and A combination of any one of anions (b1-1-3) to (b1-1-5) and a cation (b2-3) may be mentioned.

  The acid generator (B1) is preferably a salt represented by any of the formulas (B1-1) to (B1-20), more preferably a triphenylsulfonium cation or a tolylsulfonium cation. Which are acid generators containing formula (B1-1), formula (B1-2), formula (B1-3), formula (B1-6), formula (B1-7), formula (B1-11), Examples thereof include a salt represented by formula (B1-12), formula (B1-13) or (B1-14).

The content of the acid generator (B) is preferably 1 part by mass or more (more preferably 3 parts by mass or more), preferably 30 parts by mass or less (more preferably 25 parts by mass) with respect to 100 parts by mass of the resin (A). Part or less).
In the resist composition of the present invention, the acid generator (B) may contain a single acid generator or a plurality of acid generators.

［式（ＩＩ）中、
Ｒ^２及びＲ^３は、それぞれ独立に、炭素数１〜１２の炭化水素基、炭素数１〜６のアルコキシ基、炭素数２〜７のアシル基、炭素数２〜７のアシルオキシ基、炭素数２〜７のアルコキシカルボニル基、ニトロ基又はハロゲン原子を表す。
ｍ及びｎは、それぞれ独立に、０〜４の整数を表し、ｍが２以上の場合、複数のＲ^２は同一又は相異なり、ｎが２以上の場合、複数のＲ^３は同一又は相異なる。］ <Compound represented by formula (II)>
A compound represented by the formula (II) (hereinafter sometimes referred to as “compound (II)”) is shown below.

[In the formula (II),
R ² and R ³ are each independently a hydrocarbon group having 1 to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyl group having 2 to 7 carbon atoms, an acyloxy group having 2 to 7 carbon atoms, or a carbon number. Represents 2 to 7 alkoxycarbonyl groups, nitro groups or halogen atoms.
m and n each independently represent an integer of 0 to 4, when m is 2 or more, the plurality of R ² are the same or different, and when n is 2 or more, the plurality of R ³ are the same or different. . ]

In the compound represented by the formula (II), examples of the hydrocarbon group of R ² and R ³ include an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and combinations thereof. .
Examples of the aliphatic hydrocarbon group include alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, hexyl group, and nonyl group.
The alicyclic hydrocarbon group may be monocyclic or polycyclic, and may be either saturated or unsaturated. Examples thereof include cycloalkyl groups such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cyclononyl group, and cyclododecyl group, norbornyl group, adamantyl group, and the like.
As aromatic hydrocarbon group, phenyl group, 1-naphthyl group, 2-naphthyl group, 2-methylphenyl group, 3-methylphenyl group, 4-methylphenyl group, 4-ethylphenyl group, 4-propylphenyl group 4-isopropylphenyl group, 4-butylphenyl group, 4-t-butylphenyl group, 4-hexylphenyl group, 4-cyclohexylphenyl group, anthryl group, p-adamantylphenyl group, tolyl group, xylyl group, cumenyl group , Aryl groups such as mesityl group, biphenyl group, anthryl group, phenanthryl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl, and the like.
These combinations include alkyl-cycloalkyl groups, cycloalkyl-alkyl groups, aralkyl groups (eg, phenylmethyl group, 1-phenylethyl group, 2-phenylethyl group, 1-phenyl-1-propyl group, 1- Phenyl-2-propyl group, 2-phenyl-2-propyl group, 3-phenyl-1-propyl group, 4-phenyl-1-butyl group, 5-phenyl-1-pentyl group, 6-phenyl-1-hexyl Group) and the like.

Examples of the alkoxy group include a methoxy group and an ethoxy group.
Examples of the acyl group include an acetyl group, a propanoyl group, a benzoyl group, and a cyclohexanecarbonyl group.
Examples of the acyloxy group include a group in which an oxy group (—O—) is bonded to the acyl group.
Examples of the alkoxycarbonyl group include a group in which a carbonyl group (—CO—) is bonded to the above alkoxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.

In Formula (II), R ² and R ³ are each independently an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or 2 to 4 carbon atoms. And an acyloxy group having 2 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 4 carbon atoms, a nitro group, or a halogen atom is preferable.
m and n are each independently preferably an integer of 0 to 2. When m is 2 or more, the plurality of R ² are the same or different, and when n is 2 or more, the plurality of R ³ are the same or different.

Examples of the compound (II) include the following compounds.

  Compound (I) can be produced by the method described in “Tetrahedron Vol. 45, No. 19, p6281-6296”. Compound (I) may be a commercially available compound.

  The content of compound (II) is preferably about 0.01 to 5% by mass, more preferably about 0.01 to 3% by mass, and particularly preferably 0.01 to 5% by mass in the solid content of the resist composition. About 1% by mass.

<Solvent (E)>
The content rate of the solvent (E) contained in the resist composition of this invention is 90 mass% or more in a resist composition, for example, Preferably it is 92 mass% or more, More preferably, it is 94 mass% or more, for example, 99.9. It is not more than mass%, preferably not more than 99 mass%. The content rate of a solvent (E) can be measured by well-known analysis means, such as a liquid chromatography or a gas chromatography, for example.

  Examples of the solvent (E) include glycol ether esters such as ethyl cellosolve acetate, methyl cellosolve acetate and propylene glycol monomethyl ether acetate; glycol ethers such as propylene glycol monomethyl ether; ethyl lactate, butyl acetate, amyl acetate and And esters such as ethyl pyruvate; ketones such as acetone, methyl isobutyl ketone, 2-heptanone and cyclohexanone; cyclic esters such as γ-butyrolactone; A solvent (E) may contain 1 type independently, and may contain 2 or more types.

<Basic compound (hereinafter sometimes referred to as “basic compound (C)”)>
The resist composition of the present invention may contain a basic compound (C) that acts as a quencher.
The basic compound (C) is preferably a basic nitrogen-containing organic compound, and examples thereof include amines and ammonium salts. Examples of amines include aliphatic amines and aromatic amines. Aliphatic amines include primary amines, secondary amines and tertiary amines. The basic compound (C) is preferably a compound represented by the formula (C1) to a compound represented by the formula (C8), more preferably a compound represented by the formula (C1-1). It is done.

［式（Ｃ１）中、Ｒ^c1、Ｒ^c2及びＲ^c3は、それぞれ独立に、水素原子、炭素数１〜６のアルキル基、炭素数５〜１０の脂環式炭化水素基又は炭素数６〜１０の芳香族炭化水素基を表し、該アルキル基及び該脂環式炭化水素基に含まれる水素原子は、ヒドロキシ基、アミノ基又は炭素数１〜６のアルコキシ基で置換されていてもよく、該芳香族炭化水素基に含まれる水素原子は、炭素数１〜６のアルキル基、炭素数１〜６のアルコキシ基、炭素数５〜１０の脂環式炭化水素又は炭素数６〜１０の芳香族炭化水素基で置換されていてもよい。］

[In formula (C1), R ^c1 , R ^c2 and R ^c3 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 5 to 10 carbon atoms, or 6 to 6 carbon atoms. 10 represents an aromatic hydrocarbon group, and the hydrogen atom contained in the alkyl group and the alicyclic hydrocarbon group may be substituted with a hydroxy group, an amino group or an alkoxy group having 1 to 6 carbon atoms, The hydrogen atom contained in the aromatic hydrocarbon group is an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alicyclic hydrocarbon having 5 to 10 carbon atoms, or an aromatic group having 6 to 10 carbon atoms. It may be substituted with a group hydrocarbon group. ]

［式（Ｃ１−１）中、Ｒ^c2及びＲ^c3は、上記と同じ意味を表す。
Ｒ^c4は、炭素数１〜６のアルキル基、炭素数１〜６のアルコキシ基、炭素数５〜１０の脂環式炭化水素又は炭素数６〜１０の芳香族炭化水素基を表す。
ｍ３は０〜３の整数を表し、ｍ３が２以上のとき、複数のＲ^c4は同一又は相異なる。］

[In Formula (C1-1), R ^c2 and R ^c3 represent the same meaning as described above.
R ^c4 represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alicyclic hydrocarbon having 5 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms.
m3 represents an integer of 0 to 3, and when m3 is 2 or more, the plurality of R ^c4 are the same or different. ]

［式（Ｃ２）、式（Ｃ３）及び式（Ｃ４）中、Ｒ^c5、Ｒ^c6、Ｒ^c7及びＲ^c8は、それぞれ独立に、Ｒ^c1と同じ意味を表す。
Ｒ^c9は、炭素数１〜６のアルキル基、炭素数３〜６の脂環式炭化水素基又は炭素数２〜６のアルカノイル基を表す。
ｎ３は０〜８の整数を表し、ｎ３が２以上のとき、複数のＲ^c9は同一又は相異なる。］

[In Formula (C2), Formula (C3) and Formula (C4), R ^c5 , R ^c6 , R ^c7 and R ^c8 each independently represent the same meaning as R ^c1 .
R ^c9 represents an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 6 carbon atoms, or an alkanoyl group having 2 to 6 carbon atoms.
n3 represents an integer of 0 to 8, and when n3 is 2 or more, the plurality of R ^c9 are the same or different. ]

［式（Ｃ５）及び式（Ｃ６）中、Ｒ^c10、Ｒ^c11、Ｒ^c12、Ｒ^c13及びＲ^c16は、それぞれ独立に、Ｒ^c1と同じ意味を表す。
Ｒ^c14、Ｒ^c15及びＲ^c17は、それぞれ独立に、Ｒ^c4と同じ意味を表す。
ｏ３及びｐ３は、それぞれ独立に０〜３の整数を表し、ｏ３が２以上であるとき、複数のＲ^c1４は同一又は相異なり、ｐ３が２以上であるとき、複数のＲ^c15は、同一又は相異なる。
Ｌ^c1は、炭素数１〜６のアルカンジイル基、−ＣＯ−、−Ｃ（＝ＮＨ）−、−Ｓ−又はこれらを組合せた２価の基を表す。］

[In Formula (C5) and Formula (C6), R ^c10 , R ^c11 , R ^c12 , R ^c13 and R ^c16 each independently represent the same meaning as R ^c1 .
R ^c14 , R ^c15 and R ^c17 each independently represent the same meaning as R ^c4 .
o3 and p3 each independently represent an integer of 0 to 3, when o3 is 2 or more, the plurality of R ^c14 are the same or different, and when p3 is 2 or more, the plurality of R ^c15 are the same or Different.
L ^c1 represents an alkanediyl group having 1 to 6 carbon atoms, —CO—, —C (═NH) —, —S—, or a divalent group obtained by combining these. ]

［式（Ｃ７）及び式（Ｃ８）中、Ｒ^c18、Ｒ^c19及びＲ^c20は、それぞれ独立に、Ｒ^c4と同じ意味を表す。
ｑ３、ｒ３及びｓ３は、それぞれ独立に０〜３の整数を表し、ｑ３が２以上であるとき、複数のＲ^c18は同一又は相異なり、ｒ３が２以上であるとき、複数のＲ^c1９は同一又は相異なり、及びｓ３が２以上であるとき、複数のＲ^c20は同一又は相異なる。
Ｌ^c2は、単結合又は炭素数１〜６のアルカンジイル基、−ＣＯ−、−Ｃ（＝ＮＨ）−、−Ｓ−又はこれらを組合せた２価の基を表す。］

Wherein (C7) and formula ^{(C8), R c18, R} c19 and R ^c20 in each occurrence independently represent the same meaning as R ^c4.
q3, r3 and s3 each independently represents an integer of 0 to 3, and when q3 is 2 or more, the plurality of R ^c18 are the same or different, and when r3 is 2 or more, the plurality of R ^c19 are the same. Or when different and when s3 is 2 or more, the plurality of R ^c20 are the same or different.
L ^c2 represents a single bond or an alkanediyl group having 1 to 6 carbon atoms, —CO—, —C (═NH) —, —S—, or a divalent group obtained by combining these. ]

In the formulas (C1) to (C8), examples of the alkyl group, the alicyclic hydrocarbon group, the aromatic hydrocarbon group, the alkoxy group, and the alkanediyl group are the same as those described above.
Examples of the alkanoyl group include acetyl group, 2-methylacetyl group, 2,2-dimethylacetyl group, propionyl group, butyryl group, isobutyryl group, pentanoyl group, and 2,2-dimethylpropionyl group.

  Examples of the compound represented by the formula (C1) include 1-naphthylamine, 2-naphthylamine, aniline, diisopropylaniline, 2-, 3- or 4-methylaniline, 4-nitroaniline, N-methylaniline, N, N- Dimethylaniline, diphenylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, triethylamine, trimethylamine, tripropylamine, tributylamine, tri Pentylamine, trihexylamine, triheptylamine, trioctylamine, trinonylamine, tridecylamine, methyldibutylamine, methyldipentylamine, methyl Hexylamine, methyldicyclohexylamine, methyldiheptylamine, methyldioctylamine, methyldinonylamine, methyldidecylamine, ethyldibutylamine, ethyldipentylamine, ethyldihexylamine, ethyldiheptylamine, ethyldioctylamine, ethyldinonyl Amine, ethyldidecylamine, dicyclohexylmethylamine, tris [2- (2-methoxyethoxy) ethyl] amine, triisopropanolamine, ethylenediamine, tetramethylenediamine, hexamethylenediamine, 4,4′-diamino-1,2- Examples include diphenylethane, 4,4′-diamino-3,3′-dimethyldiphenylmethane, 4,4′-diamino-3,3′-diethyldiphenylmethane, and preferably diisopropyl. Piruanirin. Particularly preferred include 2,6-diisopropylaniline.

Examples of the compound represented by the formula (C2) include piperazine.
Examples of the compound represented by the formula (C3) include morpholine.
Examples of the compound represented by the formula (C4) include piperidine and hindered amine compounds having a piperidine skeleton described in JP-A No. 11-52575.
Examples of the compound represented by the formula (C5) include 2,2′-methylenebisaniline.
Examples of the compound represented by the formula (C6) include imidazole and 4-methylimidazole.
Examples of the compound represented by the formula (C7) include pyridine and 4-methylpyridine.
Examples of the compound represented by the formula (C8) include 1,2-di (2-pyridyl) ethane, 1,2-di (4-pyridyl) ethane, 1,2-di (2-pyridyl) ethene, 1, 2-di (4-pyridyl) ethene, 1,3-di (4-pyridyl) propane, 1,2-di (4-pyridyloxy) ethane, di (2-pyridyl) ketone, 4,4′-dipyridyl sulfide 4,4′-dipyridyl disulfide, 2,2′-dipyridylamine, 2,2′-dipiconylamine, bipyridine and the like.

  As ammonium salts, tetramethylammonium hydroxide, tetraisopropylammonium hydroxide, tetrabutylammonium hydroxide, tetrahexylammonium hydroxide, tetraoctylammonium hydroxide, phenyltrimethylammonium hydroxide, 3- (trifluoromethyl) phenyltrimethyl Ammonium hydroxide, tetra-n-butylammonium salicylate, choline and the like can be mentioned.

  The content of the basic compound (C) is preferably about 0.01 to 5% by mass, more preferably about 0.01 to 3% by mass, and particularly preferably based on the solid content of the resist composition. It is about 0.01-1 mass%.

<Other components (hereinafter sometimes referred to as “other components (F)”)>
The resist composition of this invention may contain the other component (F) as needed. The other component (F) is not particularly limited, and additives known in the resist field, such as sensitizers, dissolution inhibitors, surfactants, stabilizers, dyes, and the like can be used.

<Preparation of resist composition>
The resist composition of the present invention comprises a resin (A), an acid generator (B) and a compound (II), and a solvent (E), a basic compound (C) and a resin (A) used as necessary. It can be prepared by mixing the resin and the other component (F). The mixing order is arbitrary and is not particularly limited. The temperature at the time of mixing can select an appropriate temperature range from the range of 10-40 degreeC according to the kind etc. of resin, the solubility with respect to solvent (E), such as resin. An appropriate mixing time can be selected from 0.5 to 24 hours depending on the mixing temperature. The mixing means is not particularly limited, and stirring and mixing can be used.
After mixing each component, it is preferable to filter using a filter having a pore size of about 0.003 to 0.2 μm.

<Method for producing resist pattern>
The method for producing a resist pattern of the present invention comprises:
(1) The process of apply | coating the resist composition of this invention on a board | substrate,
(2) The process of drying the composition after application | coating and forming a composition layer,
(3) a step of exposing the composition layer,
(4) The process of heating the composition layer after exposure, (5) The process of developing the composition layer after a heating is included.

  Application of the resist composition onto the substrate can be performed by a commonly used apparatus such as a spin coater.

By drying the composition after coating, the solvent is removed and a composition layer is formed. Drying is performed, for example, by evaporating the solvent using a heating device such as a hot plate (so-called pre-baking) or using a decompression device to form a composition layer from which the solvent has been removed. The temperature in this case is preferably about 50 to 200 ° C., for example. The pressure is preferably about 1 to 1.0 × 10 ⁵ Pa.

The obtained composition layer is usually exposed using an exposure machine. The exposure machine may be an immersion exposure machine. At this time, exposure is usually performed through a mask corresponding to a required pattern. Exposure light sources include those that emit laser light in the ultraviolet region such as KrF excimer laser (wavelength 248 nm), ArF excimer laser (wavelength 193 nm), F ₂ excimer laser (wavelength 157 nm), solid-state laser light source (YAG or semiconductor laser) Etc.) Using various lasers such as those that convert wavelength of laser light from the laser and emit harmonic laser light in the far-ultraviolet region or vacuum ultraviolet region, those that irradiate electron beams or extreme ultraviolet light (EUV), etc. Can do.

The composition layer after exposure is subjected to heat treatment (so-called post-exposure baking) in order to promote the deprotection group reaction. As heating temperature, it is about 50-200 degreeC normally, Preferably it is about 70-150 degreeC.
The heated composition layer is usually developed using an alkali developer using a developing device.
The alkaline developer used here may be various alkaline aqueous solutions used in this field. Examples thereof include an aqueous solution of tetramethylammonium hydroxide and (2-hydroxyethyl) trimethylammonium hydroxide (commonly called choline).
After development, it is preferable to rinse with ultrapure water to remove water remaining on the substrate and the pattern.

<Application>
The resist composition of the present invention is a resist composition for KrF excimer laser exposure, a resist composition for ArF excimer laser exposure, a resist composition for electron beam (EB) exposure, or a resist composition for EUV exposure, particularly a liquid. It is suitable as a resist composition for immersion exposure.

The present invention will be described more specifically with reference to examples. In the examples, “%” and “parts” representing the content or amount used are based on mass unless otherwise specified. The composition ratio of the resin (A) (copolymerization ratio of the structural unit derived from each monomer used for the production of the resin (A) to the resin (A)) is the amount of unreacted monomer in the reaction liquid after the polymerization is finished. It measured using the chromatography, and computed by calculating | requiring the monomer amount used for superposition | polymerization from the obtained result. The weight average molecular weight is a value determined by gel permeation chromatography. The analysis conditions for gel permeation chromatography are as follows.
Apparatus: HLC-8120GPC type (manufactured by Tosoh Corporation)
Column: TSKgel Multipore HXL-M x 3 + guardcolumn (manufactured by Tosoh Corporation)
Eluent: Tetrahydrofuran Flow rate: 1.0 mL / min
Detector: RI detector Column temperature: 40 ° C
Injection volume: 100 μl
Molecular weight standard: Standard polystyrene (manufactured by Tosoh Corporation)

式（Ｈ−１）で表される化合物２５．００部、トリエチルアミン５７．７９部、ジメチルアミノピリジン０．０３部及びアセトニトリル２５０部を反応器に仕込み、２３℃で３０分間攪拌し、２℃に冷却した。この混合物に、温度５℃以下に保った状態下で、式（Ｈ−２）で表される化合物５１．００部を３０分かけて滴下した。滴下後の混合物を２℃で３０分間攪拌し、２３℃程度まで昇温し、同温度で１時間攪拌した。得られた反応混合物にイオン交換水２５部を添加攪拌し、濃縮した。濃縮物に、クロロホルム２５０部及びイオン交換水１２５部を添加・攪拌し、分液することにより有機層を水洗した。同様の水洗操作を３回繰り返した。回収された有機層を濃縮することにより、式（Ｈ−３）で表される化合物３．５８部を得た。 Synthesis Example 1: [Synthesis of Compound Represented by Formula (H)]

25.00 parts of the compound represented by the formula (H-1), 57.79 parts of triethylamine, 0.03 part of dimethylaminopyridine, and 250 parts of acetonitrile were charged into a reactor, stirred at 23 ° C. for 30 minutes, and heated to 2 ° C. Cooled down. To this mixture, 51.00 parts of the compound represented by the formula (H-2) was added dropwise over 30 minutes while keeping the temperature at 5 ° C. or lower. The mixture after dropping was stirred at 2 ° C. for 30 minutes, heated to about 23 ° C., and stirred at the same temperature for 1 hour. To the resulting reaction mixture, 25 parts of ion-exchanged water was added, stirred and concentrated. To the concentrate, 250 parts of chloroform and 125 parts of ion-exchanged water were added and stirred, followed by liquid separation to wash the organic layer with water. The same water washing operation was repeated three times. The collected organic layer was concentrated to obtain 3.58 parts of a compound represented by the formula (H-3).

A reactor is charged with 3.00 parts of a compound represented by the formula (H-4), 4.73 parts of a compound represented by the formula (H-5), 0.003 part of dimethylaminopyridine and 30 parts of tetrahydrofuran. The mixture was stirred at 23 ° C for 30 minutes and cooled to 2 ° C. To this mixture, 2.76 parts of the compound represented by the formula (H-3) and 13.78 parts of tetrahydrofuran were dropped over 30 minutes while maintaining the temperature at 5 ° C. or lower. The resulting mixture was stirred at 2 ° C. for 1 hour, then heated to about 23 ° C. and stirred at the same temperature for 20 hours. To the resulting reaction mixture, 15 parts of ion-exchanged water was added, stirred and concentrated. To the concentrate, 30 parts of ethyl acetate was added and stirred, and the organic layer was recovered by liquid separation. To the obtained organic layer, 30 parts of ion-exchanged water was added, stirred for 30 minutes, and allowed to stand and separate. To the collected organic layer, 30 parts of a 10% aqueous potassium carbonate solution was added and stirred at 23 ° C. for 30 minutes, and the aqueous layer was separated and removed. To the collected organic layer, 30 parts of 1N hydrochloric acid was added and stirred at 23 ° C. for 30 minutes, and the aqueous layer was separated and removed. The recovered organic layer was concentrated to obtain 2.78 parts of the compound represented by the formula (H).
MS (mass spectrometry): 332.0 (molecular ion peak)

Resin synthesis Monomers used in resin synthesis are shown below.

[Synthesis of Resin A1]
As the monomer, the monomer (A), the monomer (E), the monomer (B), the monomer (C), and the monomer (H) are mixed in a molar ratio [monomer (A): monomer (E): monomer (B): monomer ( C): monomer (H)] was mixed to 32: 7: 8: 43: 10, and 1.5 mass times dioxane of the total monomer amount was added to obtain a solution. To this solution, 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were added to the total monomer amount, respectively, and these were heated at 73 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The obtained resin was again dissolved in dioxane, and a solution obtained by pouring the solution into a methanol / water mixed solvent was precipitated, and the resin was filtered twice. The weight-average molecular weight was 8.4. × 10 ³ of the resin A1 (copolymer) was obtained in 84% yield. This resin A1 has the following structural units.

[Synthesis of Resin A2]
As a monomer, a monomer (D), a monomer (E), a monomer (B), a monomer (C), and a monomer (H) are mixed in a molar ratio [monomer (D): monomer (E): monomer (B): monomer ( C): monomer (H)] was mixed to 35: 10: 6: 37: 12, and 1.5 mass times dioxane of the total monomer amount was added to obtain a solution. To this solution, 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were added to the total monomer amount, respectively, and these were heated at 73 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The obtained resin was dissolved again in dioxane, and the resulting solution was poured into a methanol / water mixed solvent to precipitate the resin, followed by two reprecipitation operations of filtering the resin, and the weight average molecular weight was 8.1. × 10 ³ of the resin A2 (copolymer) was obtained in 80% yield. This resin A2 has the following structural units.

[Synthesis of Resin A3]
As a monomer, a monomer (A), a monomer (E), a monomer (B), a monomer (F), a monomer (C), and a monomer (H) are mixed in a molar ratio [monomer (A): monomer (E): monomer ( B): monomer (F): monomer (C): monomer (H)] is mixed to 32: 7: 8: 10: 33: 10, and 1.5 mass times dioxane of the total monomer amount is added. Solution. To this solution, 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were added to the total monomer amount, respectively, and these were heated at 73 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The obtained resin was again dissolved in dioxane, and the resulting solution was poured into a methanol / water mixed solvent to precipitate the resin, followed by two reprecipitation operations of filtering the resin, and a weight average molecular weight of 7.8. A × 10 ³ resin A3 (copolymer) was obtained in a yield of 75%. This resin A3 has the following structural units.

[Synthesis of Resin A4]
As the monomer, the monomer (A), the monomer (G), and the monomer (I) have a molar ratio [monomer (A): monomer (G): monomer (I)] of 52.6: 15.8: 31.6. The mixture was mixed so that 1.5 mass times dioxane of the total monomer amount was added to obtain a solution. To this solution, 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were added to the total monomer amount, respectively, and these were heated at 78 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The obtained resin was again dissolved in dioxane, and the resulting solution was poured into a methanol / water mixed solvent to precipitate the resin, followed by two reprecipitation operations of filtering the resin, and a weight average molecular weight of 7.3. × 10 ³ of the resin A4 (copolymer) was obtained in 68% yield. This resin A4 has the following structural units.

[Synthesis of Resin A5]
As a monomer, a monomer (D), a monomer (K), a monomer (B), a monomer (C), and a monomer (H) are mixed in a molar ratio [monomer (D): monomer (K): monomer (B): monomer ( C): monomer (H)] was mixed to 35: 10: 6: 37: 12, and 1.5 mass times dioxane of the total monomer amount was added to obtain a solution. To this solution, 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were added to the total monomer amount, respectively, and these were heated at 73 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The obtained resin was again dissolved in dioxane, and the resulting solution was poured into a methanol / water mixed solvent to precipitate the resin, followed by two reprecipitation operations of filtering the resin, and a weight average molecular weight of 7.5. × give 10 ^third resin A5 (copolymer) in 62% yield. This resin A5 has the following structural units.

[Synthesis of Resin A6]
Monomer (D), monomer (K), monomer (B), monomer (F), monomer (C), monomer (H) are in a molar ratio [monomer (D): monomer (K): monomer (B): Monomer (F): Monomer (C): Monomer (H)] is mixed to be 30: 14: 6: 10: 30: 10, and 1.5 mass times dioxane of the total monomer amount is added to the solution. did. 1 mol% and 3 mol% of azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators are added to the solution, respectively, and heated at 73 ° C. for about 5 hours. did. The obtained reaction mixture was poured into a large amount of methanol / water mixed solvent to precipitate the resin, and this resin was filtered. The resin thus obtained is again dissolved in dioxane, and a solution obtained by pouring the solution into a methanol / water mixed solvent is precipitated twice, and the resin is filtered twice to perform a reprecipitation operation twice. 2 × 10 ³ resin A6 (copolymer) was obtained with a yield of 58%. This copolymer has the following structural units and is designated as resin A6.

[Synthesis of Resin A7]
Monomer (D), monomer (J), monomer (B), monomer (C), monomer (H) are in a molar ratio [monomer (D): monomer (J): monomer (B): monomer (C): Monomer (H)] is mixed at a ratio of 35: 10: 6: 37: 12, and further, 1.5 mass times dioxane is mixed into this monomer mixture with respect to the total mass of all monomers. did. Into the obtained mixture, azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were respectively added to 1.00 mol% and 3.00 mol% with respect to the total number of moles of all monomers. Polymerization was carried out by heating at 73 ° C. for about 5 hours. Thereafter, the polymerization reaction solution was poured into a large amount of a mixed solvent of methanol and water (mass ratio methanol: water = 4: 1) to precipitate the resin. This resin is filtered and recovered, dissolved again in dioxane, poured into a large amount of methanol / water mixed solvent to precipitate the resin, and the precipitated resin is filtered and recovered twice to perform reprecipitation. Purification gave a copolymer having a weight average molecular weight of 8.3 × 10 ³ in a yield of 68%. This copolymer has the following structural units and is designated as resin A7.

[Synthesis of Resin A8]
Monomer (D), monomer (J), monomer (L), monomer (C), monomer (H) are in a molar ratio [monomer (D): monomer (J): monomer (L): monomer (C): Monomer (H)] is mixed at a ratio of 35: 13: 3: 37: 12, and further, 1.5 mass times dioxane is mixed with this monomer mixture with respect to the total mass of all monomers. did. Into the obtained mixture, azobisisobutyronitrile and azobis (2,4-dimethylvaleronitrile) as initiators were respectively added to 1.00 mol% and 3.00 mol% with respect to the total number of moles of all monomers. Polymerization was carried out by heating at 73 ° C. for about 5 hours. Thereafter, the polymerization reaction solution was poured into a large amount of a mixed solvent of methanol and water (mass ratio methanol: water = 4: 1) to precipitate the resin. This resin is filtered and recovered, dissolved again in dioxane, poured into a large amount of methanol / water mixed solvent to precipitate the resin, and the precipitated resin is filtered and recovered twice to perform reprecipitation. Purification gave a copolymer having a weight average molecular weight of 7.9 × 10 ³ in a yield of 70%. This copolymer has the following structural units, and is designated as resin A8.

<Preparation of resist composition>
Each of the components shown below was dissolved in a solvent in parts by mass shown in Table 1, and further filtered through a fluororesin filter having a pore size of 0.2 μm to prepare a resist composition.

Ｂ２：特開２０１０−４４３４２の実施例に従って合成

<Resin>
Resins A1 to A8 synthesized in the above synthesis example
<Acid generator>
B1: Synthesis according to the example of JP 2010-152341 A

B2: synthesized according to the example of JP2010-44342A

<Basic compound: Quencher>
C1: 2,6-diisopropylaniline (manufactured by Tokyo Chemical Industry Co., Ltd.)
<Compound represented by formula (II)>
D1: (manufactured by Tokyo Chemical Industry Co., Ltd.)

<Solvent>
Propylene glycol monomethyl ether acetate 265.0 parts Propylene glycol monomethyl ether 20.0 parts 2-heptanone 20.0 parts γ-butyrolactone 3.5 parts

<Immersion exposure evaluation of resist composition>
An organic antireflective coating composition (ARC-29; manufactured by Nissan Chemical Co., Ltd.) is applied to a silicon wafer and baked at 205 ° C. for 60 seconds to form an organic reflective film having a thickness of 78 nm on the wafer. A prevention film was formed. Next, the resist composition was applied (spin coated) on the organic antireflection film so that the film thickness after drying (pre-baking) was 85 nm. After coating, the silicon wafer was pre-baked on a direct hot plate at the temperature described in the “PB” column of Table 1 for 60 seconds to form a composition layer. ArF excimer stepper for immersion exposure (XT: 1900 Gi; manufactured by ASML, NA = 1.35, 3/4 Annular XY polarized light) on a silicon wafer on which the composition layer is formed, and a contact hole pattern (hole pitch 100 nm) Using a mask for forming a hole diameter of 70 nm), the exposure amount was changed stepwise to perform exposure. Note that ultrapure water was used as the immersion medium.
After the exposure, the silicon wafer was heated (post-exposure baking process) on a hot plate at a temperature described in the “PEB” column of Table 1 for 60 seconds. Next, this silicon wafer was subjected to paddle development for 60 seconds with a 2.38% tetramethylammonium hydroxide aqueous solution to obtain a resist pattern.

  In the resist pattern obtained after development, the exposure amount at which the hole diameter formed using the mask was 55 nm was defined as the effective sensitivity.

<Evaluation of CD uniformity (CDU)>
In terms of effective sensitivity, the hole diameter of the pattern formed by the mask was measured 24 times per hole, and the average value was taken as the average hole diameter of one hole. The average hole diameter was measured for 400 holes formed on the same silicon wafer with the mask, and the standard deviation was determined using these as the population.
When the standard deviation is less than 1.85 nm,
When the standard deviation is 1.85 nm or more and less than 2.00 nm, “◯”,
The case where the standard deviation was 2.00 nm or more was judged as “x”.
The results are shown in Table 2. Numerical values in parentheses indicate standard deviation (nm).

  According to the resist composition containing the resin of the present invention, a resist pattern with good CD uniformity can be produced.

Claims (7)

(A) a resin having a structural unit represented by formula (I), insoluble or hardly soluble in an alkaline aqueous solution, and soluble in an alkaline aqueous solution by the action of an acid;
A resist composition containing (B) an acid generator and (D) a compound represented by formula (II).

[In the formula (I),
Ring T ¹ represents a C3-C34 sultone ring which may have a substituent.
Z ¹ is an alkanediyl group having 1 to 6 carbon atoms which may have a substituent or a group represented by the formula (a-1)

(In the formula (a-1),
s represents an integer of 0 or 1.
X ¹⁰ and X ¹¹ each independently represent an oxygen atom, an imino group, a carbonyl group, a carbonyloxy group, an oxycarbonyl group, a carbonylimino group or an iminocarbonyl group.
A ¹⁰ , A ¹¹ and A ¹² each independently represent a C 1-5 divalent aliphatic hydrocarbon group which may have a substituent. However, the total number of carbon atoms of A ¹⁰ , A ¹¹ and A ¹² is 6 or less. )
Represents.
Z ² represents a single bond or a carbonyl group.
R ¹ represents a C 1-6 alkyl group, a hydrogen atom or a halogen atom which may have a halogen atom. ]

[In the formula (II),
R ² and R ³ are each independently a hydrocarbon group having 1 to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an acyl group having 2 to 7 carbon atoms, an acyloxy group having 2 to 7 carbon atoms, or a carbon number. Represents 2 to 7 alkoxycarbonyl groups, nitro groups or halogen atoms.
m and n each independently represent an integer of 0 to 4, when m is 2 or more, the plurality of R ² are the same or different, and when n is 2 or more, the plurality of R ³ are the same or different. . ] The resist composition according to claim 1, wherein the ring T ¹ is a polycyclic sultone ring. The resist composition according to claim 1, wherein the ring T ¹ is a ring represented by the formula (T1).

[In the formula (T1),
R ⁴ is a C 1-12 alkyl group optionally having a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, an oxy group, a cyano group, a C 1-12 alkoxy group, a C 6-12 12 represents an aryl group having 12 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, or an acyl group having 2 to 4 carbon atoms.
t represents an integer of 0 to 9, and when t is 2 or more, the plurality of R ⁴ are the same or different.
* Represents a bond with an oxygen atom. ] The resist composition according to claim 1, wherein Z ² in formula (I) is a carbonyl group. Z ¹ in Formula (I) is a methylene group, The resist composition in any one of Claims 1-4.   Furthermore, the resist composition in any one of Claims 1-5 containing a solvent. (1) The process of apply | coating the resist composition in any one of Claims 1-6 on a board | substrate,
(2) The process of drying the composition after application | coating and forming a composition layer,
(3) a step of exposing the composition layer,
(4) a step of heating the composition layer after exposure, and (5) a step of developing the composition layer after heating,
A method for producing a resist pattern including: