JP2019019184A - Polymer, method of producing the same, and optical film using the same - Google Patents

Abstract

To provide a novel polymer expected to form an optical compensation film excellent in compatibility and phase difference characteristics, such as having a high phase difference even in a thin film.SOLUTION: The polymer comprises a monomer residue unit represented by general formula (1).SELECTED DRAWING: None

Description

  The present invention relates to a novel polymer and a process for producing the same, and an optical film using the same, and more specifically, an optical film having a high retardation even in a thin film, particularly for liquid crystal display elements and organic films. The present invention relates to a novel polymer suitable for an optical compensation film for EL, a method for producing the same, and an optical film using the same.

  A liquid crystal display is widely used as a most important display device in a multimedia society, such as a mobile phone, a computer monitor, a notebook computer, and a television.

  Many optical films are used in liquid crystal displays to improve display characteristics. In particular, retardation films play a large role in improving contrast and compensating for color tone when viewed from the front or obliquely. As the conventional retardation film, polycarbonate or cyclic polyolefin is used, and these polymers are polymers having positive birefringence. Here, the sign of birefringence is defined as shown below.

  The optical anisotropy of the polymer film molecularly oriented by stretching or the like is such that the refractive index in the fast axis direction in the film plane when the film is stretched is nx, the refractive index in the in-plane direction perpendicular to the film is ny, and the film It can be represented by a refractive index ellipsoid where the refractive index in the thickness direction is nz. The fast axis indicates an axial direction having a low refractive index in the film plane.

  Negative birefringence means that the stretching direction is the fast axis direction, and positive birefringence means that the direction perpendicular to the stretching direction is the fast axis direction.

  That is, in the uniaxial stretching of the polymer having negative birefringence, the refractive index in the stretching axis direction is small (fast axis: stretching direction), and in the uniaxial stretching of the polymer having positive birefringence, the axial direction perpendicular to the stretching axis. Has a small refractive index (fast axis: direction perpendicular to the stretching direction).

  Many polymers have positive birefringence. As a polymer having negative birefringence, there are acrylic resin and polystyrene. However, acrylic resin has a small retardation, and the properties as a retardation film are not sufficient. Since polystyrene has a large photoelastic coefficient in the low-temperature region, it has a problem of stability of phase difference such as phase difference being changed by a slight stress, and a practical problem of low heat resistance, and is not used at present. .

  A stretched polymer film exhibiting negative birefringence has a high refractive index in the thickness direction of the film, resulting in an unprecedented retardation film. For example, a super twist nematic liquid crystal display (STN-LCD) or a vertically aligned liquid crystal Useful as a retardation film for compensating viewing angle characteristics of displays (VA-LCD), in-plane oriented liquid crystal displays (IPS-LCD), reflective liquid crystal displays (reflective LCDs), and viewing angle compensation films for deflecting plates Therefore, the market demand is strong for retardation films having negative birefringence.

  There has been proposed a film manufacturing method in which a polymer having positive birefringence is used to increase the refractive index in the thickness direction of the film. One is a treatment method (for example, Patent Documents 1 to 3) in which a heat-shrinkable film is bonded to one side or both sides of a polymer film, and the laminate is subjected to a heat stretching treatment to apply a shrinkage force in the film thickness direction of the polymer film. Reference). In addition, a method of uniaxial stretching in a plane while applying an electric field to a polymer film has been proposed (see, for example, Patent Document 4).

  In addition, a retardation film composed of fine particles having negative optical anisotropy and a transparent polymer such as a maleimide copolymer has been proposed (for example, see Patent Document 5).

  However, the methods proposed in Patent Documents 1 to 4 have a problem that productivity is inferior because the manufacturing process becomes very complicated. In addition, the control of the uniformity of the phase difference and the like is significantly more difficult than the control by the conventional stretching.

  The retardation film obtained in Patent Document 5 is a retardation film that exhibits negative birefringence by adding fine particles having negative optical anisotropy. From the viewpoint of simplification of production method and economical efficiency, fine particles are obtained. There is a need for retardation films that do not require the addition of. In addition, with the expansion of applications of displays, there is a demand for retardation films with higher heat resistance.

  Moreover, the fumaric acid diester type | system | group copolymer and the phase difference film which consists of it are proposed (for example, refer patent documents 6-12).

  Although the fumaric acid diester copolymer proposed in Patent Documents 6 to 12 and a film comprising the same have a high retardation, a film having a high retardation even in a thin film is required at present. Yes.

  Furthermore, a single film type retardation film material by combining a positive birefringent material and a negative birefringent material has been proposed (for example, see Patent Documents 13 and 14), and achieves higher performance optical characteristics. Therefore, there is a need for a polymer material exhibiting negative birefringence that can be combined.

Japanese Patent No. 2818983 JP 05-297223 A JP 05-323120 A Japanese Patent Laid-Open No. 06-88909 JP 2005-156862 A JP 2008-112141 A JP 2012-032784 A WO2012 / 005120 JP 2008-129465 A JP 2006-193616 A WO2014 / 013982 WO2014 / 084178 WO2014 / 196552 WO2016 / 060115

  The present invention has been made in view of the above problems, and its purpose is to provide a polymer that exhibits negative birefringence by being a monomer unit having a specific structure, and a position obtained by using the polymer. An object of the present invention is to provide a polymer that is excellent in phase difference characteristics and compatibility with different polymers and can be easily combined, and an optical film comprising the same.

  As a result of intensive studies in order to solve the above problems, the present inventors have found that a specific copolymer can solve the above problems, and have completed the present invention.

  That is, this invention relates to the polymer characterized by including the monomer residue unit represented by General formula (1), its manufacturing method, and an optical film using the same.

(Here, R ₁ and R ₂ are each independently hydrogen (except when R ₁ and R ₂ are both hydrogen), halogen, a linear alkyl group having 1 to 12 carbon atoms, and 1 carbon atom. 12 branched alkyl group, a cyclic group of 3 to 14 carbon atoms, a cyano group, a carboxyl group, an ester group (-C (= O) OX ₁ or _{-CO (= O) -X 2)} , an alkoxy group (- OX ₃ ) or an amide group (—C (═O) N (X ₄ ) (X ₅ ) or —NX ₆ C (═O) X ₇ ) (where X _{1 to} X ₃ are each independently carbon A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{4 to} X ₇ are each independently hydrogen, carbon number 1 -12 linear alkyl group, branched alkyl group having 1 to 12 carbon atoms, or ring having 3 to 14 carbon atoms R ₃ represents hydrogen or halogen, and R _{4 to} R ₈ are each a hydrogen atom or a halogen atom, which may contain a hetero atom in the linear or branched alkyl group or the cyclic group. Hydrogen, halogen, linear alkyl group having 1 to 12 carbon atoms, branched alkyl group having 1 to 12 carbon atoms, cyclic group having 3 to 14 carbon atoms, hydroxy group, carboxy group, sulfoxy group, nitro Group, cyano group, thiol group, ester group (—C (═O) OX ₈ or —CO (═O) —X ₉ ), alkoxy group (—OX ₁₀ ), amide group (—C (═O) N ( _{X 11) (X 12)} or _{-NX 13 C (= O) X} 14), an acyl group _{(-C (= O) X 15} ), an amino group _{(-N (X 16) (X} 17)) or a sulfonyl group (-SOOX ₁₈ ) (where X _{8 to} X ₁₀ are Each independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{11 to} X ₁₈ are each independently Hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms), and at least R _{4 to} R ₈ 1 or more represents one or more selected from a hydroxy group, a carboxy group, and a sulfoxy group, and R _{4 to} R ₈ may form a condensed ring structure with adjacent substituents.
Hereinafter, the polymer suitable for the optical compensation film of the present invention will be described in detail.

  The polymer of this invention is a polymer containing the monomer residue unit represented by General formula (1). And the polymer of this invention expresses negative birefringence and compatibility with a dissimilar polymer by including the monomer residue unit represented by General formula (1).

In the general formula (1) of the present invention, R ₁ and R ₂ are each independently hydrogen (except when both R ₁ and R ₂ are hydrogen), halogen, and a straight chain having 1 to 12 carbon atoms. An alkyl group, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, a cyano group, a carboxy group, an ester group (—C (═O) OX ₁ or —CO (═O) —X ₂ ), An alkoxy group (—OX ₃ ) or an amide group (—C (═O) N (X ₄ ) (X ₅ ) or —NX ₆ C (═O) X ₇ ) (where X _{1 to} X ₃ are Each independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{4 to} X ₇ are each independently Hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, Represents a cyclic group having 3 to 14 carbon atoms, and may contain a hetero atom in the linear or branched alkyl group or in the cyclic group.

Examples of the halogen in R ₁ and R ₂ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as a pentyl group, hexyl group, and 2-methoxyethyl group. Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec -A branched alkyl group having 1 to 12 carbon atoms such as a butyl group, a tert-butyl group, and a 2-methoxypropyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, Cyclopentyl group, cyclohexyl group, cyclopentanyl group, phenyl group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group Examples thereof include cyclic groups having 3 to 14 carbon atoms such as a pyridyl group, an indolyl group, and a carbazolyl group. Specific examples of the ester group include a methyloxycarbonyl group, an ethyloxycarbonyl group, an acetoxy group, and a propoxy group. Specific examples of the alkoxy group include a methoxy group and an ethoxy group. Specific examples of the amide group include a dimethylamide group and a diethylamide group.

Here, in order to express the good optical properties, of R ₁ and R _2, it is preferable that at least 1 or more is one or more selected cyano group, an ester group, an amide group, an acyl group, R _1, More preferably, each R ₂ is independently a cyano group, an ester group or an amide group.

Examples of the linear alkyl group having 1 to 12 carbon atoms in the X ₁ to X _7, for example, mentioned a methyl group, an ethyl group, n- propyl group, n- butyl group, n- pentyl group, n- hexyl and the like Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, sec-butyl group, tert-butyl group, isobutyl group and the like, and examples of the cyclic group having 3 to 14 carbon atoms include: A cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a phenyl group, a naphthyl group, etc. are mentioned.

R ₃ in the general formula (1) of the present invention represents hydrogen or halogen. Examples of the halogen include fluorine, chlorine, bromine and the like.

R _{4 to} R ₈ in the general formula (1) of the present invention are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 to 3 carbon atoms. 14 cyclic groups, hydroxy groups, carboxy groups, sulfoxy groups, nitro groups, cyano groups, thiol groups, ester groups (—C (═O) OX ₈ or —CO (═O) —X ₉ ), alkoxy groups (— OX ₁₀ ), an amide group (—C (═O) N (X ₁₁ ) (X ₁₂ ) or —NX ₁₃ C (═O) X ₁₄ ), an acyl group (—C (═O) X ₁₅ ), an amino group (—N (X ₁₆ ) (X ₁₇ )) or a sulfonyl group (—SOOX ₁₈ ) (where X _{8 to} X ₁₀ are each independently a linear alkyl group having 1 to 12 carbon atoms, 1 carbon atom) -12 branched alkyl group or C3-C14 cyclic group _Shows, X 11 _{to X 18} are each independently represent a hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having a carbon number of 3 to 14. ). Further, at least one or more hydroxy groups of R ₄ to R _8, carboxy group, one or more selected from sulfoxy group, the compatibility of the different polymers is improved, at least one or more R ₄ to R ₈ Is preferably a hydroxy group. R _{4 to} R ₈ may form a condensed ring structure with adjacent substituents.

Examples of the halogen in R _{4 to} R ₈ include fluorine, chlorine, bromine and the like. Examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group, etc. Specific examples of the ester group include a methyloxycarbonyl group, an ethyloxycarbonyl group, an acetoxy group, and a propoxy group. Specific examples of the alkoxy group include, for example, , A methoxy group, an ethoxy group, and the like. Specific examples of the amide group include a dimethylamide group and a diethylamide group. Specific examples of the acyl group include, for example, an acetyl group, a propionyl group, and a benzoyl group. Specific amino groups include, for example, dimethylamino group, diethylamino group and the like, and specific sulfonyl groups include, for example, methylsulfonyl group, ethylsulfonyl group, phenylsulfonyl group and the like. As the condensed ring structure, for example, a cyclohexane ring structure, a benzene ring structure, Fused ring structures such as run-ring structure can be mentioned, may have a substituent on the fused ring.

Examples of the linear alkyl group having 1 to 12 carbon atoms in X ₈ to X _18, for example, mentioned a methyl group, an ethyl group, n- propyl group, n- butyl group, n- pentyl group, n- hexyl and the like Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, sec-butyl group, tert-butyl group, isobutyl group and the like, and examples of the cyclic group having 3 to 14 carbon atoms include: A cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a phenyl group, a naphthyl group, etc. are mentioned.

As a specific monomer residue unit represented by the general formula (1), for example,
2-hydroxy-α, β, β-trifluorostyrene residue unit, 3-hydroxy-α, β, β-trifluorostyrene residue unit, 4-hydroxy-α, β, β-trifluorostyrene residue unit 2-carboxy-α, β, β-trifluorostyrene residue unit, 3-carboxy-α, β, β-trifluorostyrene residue unit, 4-carboxy-α, β, β-trifluorostyrene residue unit Unit, 4-sulfoxy-α, β, β-trifluorostyrene residue unit, 2,3-dihydroxy-α, β, β-trifluorostyrene residue unit, 2,4-dihydroxy-α, β, β- Trifluorostyrene residue unit, 3,4-dihydroxy-α, β, β-trifluorostyrene residue unit, 2-hydroxycinnamonitrile residue unit, 3-hydroxycinnamonitrile residue unit, 4-hydride Xycinnamonitrile residue unit, 2-carboxycinnamonitrile residue unit, 3-hydroxycinnamonitrile residue unit, 4-hydroxycinnamonitrile residue unit, 2-carboxycinnamonitrile residue unit, 3- Carboxycinnamonitrile residue unit, 4-carboxycinnamonitrile residue unit, 4-sulfoxycinnamonitrile residue unit, 2-hydroxycinnamic acid residue unit, 3-hydroxycinnamic acid residue unit, 4 -Hydroxycinnamic acid residue unit, 2-carboxycinnamic acid residue unit, 3-carboxycinnamic acid residue unit, 4-carboxycinnamic acid residue unit, 4-sulfoxycinnamic acid residue unit, 2- Hydroxycinnamate methyl residue unit, 3-hydroxycinnamate methyl residue unit, 4-hydroxycinnamate methyl residue unit, 2-carboxyke Cinnamate methyl residue unit, 3-carboxycinnamate methyl residue unit, 4-carboxycinnamate methyl residue unit, 4-sulfoxycinnamic acid methyl residue unit, 2-hydroxycinnamic acid ethyl residue unit, 3-hydroxycinnamic acid ethyl residue unit, 4-hydroxy ethyl cinnamic acid residue unit, 2-carboxy ethyl cinnamic acid residue unit, 3-carboxy ethyl cinnamic acid residue unit, 4-carboxy cinnamic acid Ethyl residue unit, 4-sulfoxycinnamic acid ethyl residue unit, 2-hydroxypropylcinnamic acid propyl residue unit, 3-hydroxypropylcinnamic acid propyl residue unit, 4-hydroxyxycinnamic acid propyl residue unit, 2- Carboxy cinnamate propyl residue unit, 3-carboxy propyl cinnamate residue unit, 4-carboxy propyl cinnamate residue unit, 4-sulfoxy cinnamate pro unit Pill residue unit, 4-sulfoxy-α, β, β-trifluoro-1-vinylnaphthalene residue unit, 2,3-dihydroxy-α, β, β-trifluoro-1-vinylnaphthalene residue unit, 2 , 4-Dihydroxy-α, β, β-trifluoro-1-vinylnaphthalene residue unit, 3,4-dihydroxy-α, β, β-trifluoro-1-vinylnaphthalene residue unit, 2-hydroxy-β -Cyano-1-vinylnaphthalene residue unit, 3-hydroxy-β-cyano-1-vinylnaphthalene residue unit, 4-hydroxy-β-cyano-1-vinylnaphthalene residue unit, 2-carboxy-β-cyano -1-vinylnaphthalene residue unit, 3-hydroxy-β-cyano-1-vinylnaphthalene residue unit, 4-hydroxy-β-cyano-1-vinylnaphthalene residue unit, 2-carbo Si-β-cyano-1-vinylnaphthalene residue unit, 3-carboxy-β-cyano-1-vinylnaphthalene residue unit, 4-carboxy-β-cyano-1-vinylnaphthalene residue unit, 4-sulfoxy- β-cyano-1-vinylnaphthalene residue unit, β- (2-hydroxy-1-naphthyl) acrylic acid residue unit, β- (3-hydroxy-1-naphthyl) acrylic acid residue unit, β- (4 -Hydroxy-1-naphthyl) acrylic acid residue unit, β- (2-carboxy-1-naphthyl) acrylic acid residue unit, β- (3-carboxy-1-naphthyl) acrylic acid residue unit, β- ( 4-carboxy-1-naphthyl) acrylic acid residue unit, β- (4-sulfoxy-1-naphthyl) acrylic acid residue unit, β- (2-hydroxy-1-naphthyl) acrylic acid methyl residue unit β- (3-hydroxy-1-naphthyl) methyl acrylate residue unit, β- (4-hydroxy-1-naphthyl) methyl acrylate residue unit, β- (2-carboxy-1-naphthyl) methyl acrylate Residual unit, β- (3-carboxy-1-naphthyl) methyl acrylate residue unit, β- (4-carboxy-1-naphthyl) methyl acrylate residue unit, β- (4-sulfoxy-1-naphthyl) ) Methyl acrylate residue unit, β- (2-hydroxy-1-naphthyl) ethyl acrylate residue unit, β- (3-hydroxy-1-naphthyl) ethyl acrylate residue unit, β- (4-hydroxy -1-naphthyl) ethyl acrylate residue unit, β- (2-carboxy-1-naphthyl) ethyl acrylate residue unit, β- (3-carboxy-1-naphthyl) ethyl acrylate Group unit, β- (4-carboxy-1-naphthyl) ethyl acrylate residue unit, β- (4-sulfoxy-1-naphthyl) ethyl acrylate residue unit, β- (2-hydroxy-1-naphthyl) Propyl acrylate residue unit, β- (3-hydroxy-1-naphthyl) propyl acrylate residue unit, β- (4-hydroxy-1-naphthyl) propyl acrylate residue unit, β- (2-carboxy- 1-naphthyl) propyl acrylate residue unit, β- (3-carboxy-1-naphthyl) propyl acrylate residue unit, β- (4-carboxy-1-naphthyl) propyl acrylate residue unit, β- ( 4-sulfoxy-1-naphthyl) propyl acrylate residue unit, 2-hydroxycinnamamide residue unit, 3-hydroxycinnamamide residue unit, 4-hydroxysilane Nnamamide residue unit, 2-carboxycinnamamide residue unit, 3-carboxycinnamamide residue unit, 4-carboxycinnamamide residue unit, 4-sulfoxycinnamamide residue unit, N, N-dimethyl 2-hydroxycinnamamide residue unit, N, N-dimethyl-3-hydroxycinnamamide residue unit, N, N-dimethyl-4-hydroxycinnamamide residue unit, N, N-dimethyl-2 -Carboxycinnamamide residue unit, N, N-dimethyl-3-carboxycinnamamide residue unit, N, N-dimethyl-4-carboxycinnamamide residue unit, N, N-dimethyl-4-sulfo Xycinnamamide residue unit, N, N-diethyl 2-hydroxycinnamamide residue unit, N, N-diethyl 3-hydroxycinnamamide residue Units, N, N-diethyl 4-hydroxycinnamamide residue units, N, N-diethyl 2-carboxycinnamamide residue units, N, N-diethyl 3-carboxycinnamamide residue units, N, N -Diethyl 4-carboxycinnamamide residue unit, N, N-diethyl 4-sulfoxycinnamamide residue unit, 2-hydroxy-β-methylstyrene residue unit, 3-hydroxy-β-methylstyrene residue unit 4-hydroxy-β-methylstyrene residue unit, 2-carboxy-β-methylstyrene residue unit, 3-carboxy-β-methylstyrene residue unit, 4-carboxy-β-methylstyrene residue unit, 4 -Sulfoxy-β-methylstyrene residue unit, 2-hydroxybenzylidenemalononitrile residue unit, 3-hydroxybenzylidenemalononito Ryl residue unit, 4-hydroxybenzylidenemalononitrile residue unit, 2,3-dihydroxybenzylidenemalononitrile residue unit, 2,4-dihydroxybenzylidenemalononitrile residue unit, 3,4-dihydroxybenzylidenemalononitrile residue unit 2-carboxybenzylidenemalononitrile residue unit, 3-carboxybenzylidenemalononitrile residue unit, 4-carboxybenzylidenemalononitrile residue unit, 2,3-dicarboxybenzylidenemalononitrile residue unit, 2,4-dicarboxyl Benzylidenemalononitrile residue unit, 3,4-dicarboxybenzylidenemalononitrile residue unit, 4-sulfoxybenzylidenemalononitrile residue unit, 2-hydroxybenzylidenemalonate dimethyl residue unit, 3-hydroxy Dimethylidene malonate dimethyl residue unit, 4-hydroxybenzylidene malonate dimethyl residue unit, 2,3-dihydroxybenzylidene malonate dimethyl residue unit, 2,4-dihydroxybenzylidene malonate dimethyl residue unit, 3,4- Dihydroxybenzylidene malonate dimethyl residue unit, 2-carboxybenzylidene malonate dimethyl residue unit, 3-carboxybenzylidene malonate dimethyl residue unit, 4-carboxybenzylidene malonate dimethyl residue unit, 2,3-dicarboxybenzylidene malon Dimethyl acid residue unit, dimethyl 2,4-dicarboxybenzylidene malonate residue unit, 3,4-dicarboxybenzylidene malonate dimethyl residue unit, 4-sulfoxybenzylidene malonate dimethyl residue unit, 2-hydroxybenzyl Dimethyl malonate residue unit, diethyl 3-hydroxybenzylidenemalonate residue unit, 4-hydroxybenzylidenemalonate diethyl residue unit, diethyl 2,3-dihydroxybenzylidenemalonate residue unit, 2,4-dihydroxybenzylidenemalonic acid Diethyl residue unit, 3,4-dihydroxybenzylidene malonate diethyl residue unit, 2-carboxybenzylidene malonate diethyl residue unit, 3-carboxybenzylidene malonate diethyl residue unit, 4-carboxybenzylidene malonate diethyl residue unit 2,3-dicarboxybenzylidene malonate diethyl residue unit, 2,4-dicarboxybenzylidene malonate diethyl residue unit, 3,4-dicarboxybenzylidene malonate diethyl residue unit, 4-sulfoxybenzylidene dimer Diethyl ronate residue unit, 2-hydroxybenzylidene malonate dipropyl residue unit, 3-hydroxybenzylidene malonate dipropyl residue unit, 4-hydroxybenzylidene malonate dipropyl residue unit, 2,3-dihydroxybenzylidene malonate dipropyl residue Base unit, 2,4-dihydroxybenzylidene malonate dipropyl residue unit, 3,4-dihydroxybenzylidene malonate dipropyl residue unit, 2-carboxybenzylidene malonate dipropyl residue unit, 3-carboxybenzylidene malonate dipropyl residue unit 4-carboxybenzylidene malonate dipropyl residue unit, 2,3-dicarboxybenzylidene malonate dipropyl residue unit, 2,4-dicarboxybenzylidene malonate dipropyl residue unit, 3,4-dicarboxyl Benzylidene malonate dipropyl residue unit, 4-sulfoxybenzylidene malonate dipropyl residue unit, 2-hydroxybenzylidene malonate diisopropyl residue unit, 3-hydroxybenzylidene malonate diisopropyl residue unit, 4-hydroxybenzylidene malonate diisopropyl residue Group unit, diisopropyl residue unit of 2,3-dihydroxybenzylidene malonate, diisopropyl residue unit of 2,4-dihydroxybenzylidene malonate, diisopropyl residue unit of 3,4-dihydroxybenzylidene malonate, diisopropyl residue of 2-carboxybenzylidene malonate Group unit, 3-carboxybenzylidene malonate diisopropyl residue unit, 4-carboxybenzylidene malonate diisopropyl residue unit, 2,3-dicarboxybenzylidene Diisopropyl malonate residue unit, 2,4-dicarboxybenzylidene malonate diisopropyl residue unit, 3,4-dicarboxybenzylidene malonate diisopropyl residue unit, 4-sulfoxybenzylidene malonate diisopropyl residue unit, 2-hydroxy Benzylidene malonate dibutyl residue unit, 3-hydroxybenzylidene malonate dibutyl residue unit, 4-hydroxybenzylidene malonate dibutyl residue unit, 2,3-dihydroxybenzylidene malonate dibutyl residue unit, 2,4-dihydroxybenzylidene malon Dibutyl residue unit, 3,4-dihydroxybenzylidene malonate dibutyl residue unit, 2-carboxybenzylidene malonate dibutyl residue unit, 3-carboxybenzylidene malonate dibutyl residue unit, 4-carboxy Benzylidene malonate dibutyl residue unit, 2,3-dicarboxybenzylidene malonate dibutyl residue unit, 2,4-dicarboxybenzylidene malonate dibutyl residue unit, 3,4-dicarboxybenzylidene malonate dibutyl residue unit, 4-sulfoxybenzylidene malonate dibutyl residue unit, 2-hydroxybenzylidene malonate diisobutyl residue unit, 3-hydroxybenzylidene malonate diisobutyl residue unit, 4-hydroxybenzylidene malonate diisobutyl residue unit, 2,3-dihydroxy Benzylidene malonate diisobutyl residue unit, 2,4-dihydroxybenzylidene malonate diisobutyl residue unit, 3,4-dihydroxybenzylidene malonate diisobutyl residue unit, 2-carboxybenzylidene malonate diisobutyl residue unit Unit, 3-carboxybenzylidene malonate diisobutyl residue unit, 4-carboxybenzylidene malonate diisobutyl residue unit, 2,3-dicarboxybenzylidene malonate diisobutyl residue unit, 2,4-dicarboxybenzylidene malonate diisobutyl residue Unit, 3,4-dicarboxybenzylidene malonate diisobutyl residue unit, 4-sulfoxybenzylidene malonate diisobutyl residue unit, 2-hydroxybenzylidene malonate disec-butyl residue unit, 3-hydroxybenzylidene malonate disec -Butyl residue unit, 4-hydroxybenzylidene malonate disec-butyl residue unit, 2,3-dihydroxybenzylidene malonate disec-butyl residue unit, 2,4-dihydroxybenzylidene malonate disec-butyl residue Unit, 3,4-dihydroxybenzylidenemalonate disec-butyl residue unit, 2-carboxybenzylidenemalonate disec-butyl residue unit, 3-carboxybenzylidenemalonate disec-butyl residue unit, 4-carboxybenzylidene Disec-butyl malonate residue unit, 2,3-dicarboxybenzylidene malonate disec-butyl residue unit, 2,4-dicarboxybenzylidene malonate disec-butyl residue unit, 3,4-dicarboxyl Benzylidenemalonate disec-butyl residue unit, 4-sulfoxybenzylidenemalonate disec-butyl residue unit, 2-hydroxybenzylidenemalonate ditert-butyl residue unit, 3-hydroxybenzylidenemalonate ditert-butyl Residue unit, 4-hydroxybenzylidenemalon Di-tert-butyl acid residue unit, di-tert-butyl residue unit, 2,3-dihydroxybenzylidene malonate di-tert-butyl residue unit, 2,4-dihydroxybenzylidene malonate, di-3,4-dihydroxybenzylidene malonate unit tert-butyl residue unit, 2-carboxybenzylidene malonate ditert-butyl residue unit, 3-carboxybenzylidene malonate ditert-butyl residue unit, 4-carboxybenzylidene malonate ditert-butyl residue unit, 2 , 3-dicarboxybenzylidenemalonate ditert-butyl residue unit, 2,4-dicarboxybenzylidenemalonate ditert-butyl residue unit, 3,4-dicarboxybenzylidenemalonate ditert-butyl residue unit, 4-sulfoxybenzylidenemalonic acid diter -Butyl residue unit, α-cyano-2-hydroxycinnamic acid residue unit, α-cyano-3-hydroxycinnamic acid residue unit, α-cyano-4-hydroxycinnamic acid residue unit, α- Cyano-2-carboxycinnamic acid residue unit, α-cyano-3-carboxycinnamic acid residue unit, α-cyano-4-carboxycinnamic acid residue unit, α-cyano-4-sulfoxycinnamic acid residue Group unit, α-cyano-2-hydroxycinnamate methyl residue unit, α-cyano-3-hydroxycinnamate methyl residue unit, α-cyano-4-hydroxycinnamate methyl residue unit, α- Cyano-2-carboxycinnamate methyl residue unit, α-cyano-3-carboxycinnamate methyl residue unit, α-cyano-4-carboxycinnamate methyl residue unit, α-cyano-4-sulfoxysilicate Methyl cinnamate residue unit α-cyano-2-hydroxycinnamic acid ethyl residue unit, α-cyano-3-hydroxycinnamic acid ethyl residue unit, α-cyano-4-hydroxyethyl cinnamic acid ethyl residue unit, α-cyano-2 -Ethyl carboxycinnamate residue unit, ethyl α-cyano-3-carboxycinnamate residue unit, ethyl α-cyano-4-carboxycinnamate residue, ethyl α-cyano-4-sulfoxycinnamate Residue unit, α-cyano-2-hydroxypropylcinnamate residue unit, α-cyano-3-hydroxypropylcinnamate residue unit, α-cyano-4-hydroxypropylcinnamate residue unit, α -Cyano-2-carboxy cinnamate propyl residue unit, α-cyano-3-carboxy cinnamate propyl residue unit, α-cyano-4-carboxy cinnamate propyl residue unit, α-cyano- -Sulfoxy cinnamate propyl residue unit, α-cyano-2-hydroxycinnamate isopropyl residue unit, α-cyano-3-hydroxycinnamate isopropyl residue unit, α-cyano-4-hydroxycinnamate isopropyl residue unit Residue unit, α-cyano-2-carboxycinnamate isopropyl residue unit, α-cyano-3-carboxycinnamate isopropyl residue unit, α-cyano-4-carboxycinnamate isopropyl residue unit, α -Cyano-4-sulfoxycinnamate isopropyl residue unit, α-cyano-2-hydroxybutyl cinnamate residue unit, α-cyano-3-hydroxybutyl cinnamate residue unit, α-cyano-4-hydroxy Butyl cinnamate residue unit, α-cyano-2-carboxybutyl cinnamate residue unit, α-cyano-3-carboxybutyl cinnamate residue Unit, α-cyano-4-carboxybutyl cinnamate residue unit, α-cyano-4-sulfoxybutyl cinnamate residue unit, α-cyano-2-hydroxycinnamate residue unit, α-cyano- 3-hydroxycinnamic acid isobutyl residue unit, α-cyano-4-hydroxycinnamic acid isobutyl residue unit, α-cyano-2-carboxycinnamic acid isobutyl residue unit, α-cyano-3-carboxycinnamic acid Isobutyl residue unit, α-cyano-4-carboxycinnamic acid isobutyl residue unit, α-cyano-4-sulfoxycinnamic acid isobutyl residue unit, α-cyano-2-hydroxycinnamic acid sec-butyl residue Unit, α-cyano-3-hydroxycinnamic acid sec-butyl residue unit, α-cyano-4-hydroxycinnamic acid sec-butyl residue unit, α-cyano-2- Ruboxycinnamic acid sec-butyl residue unit, α-cyano-3-carboxycinnamic acid sec-butyl residue unit, α-cyano-4-carboxycinnamic acid sec-butyl residue unit, α-cyano-4- Sulfoxycinnamic acid sec-butyl residue unit, α-cyano-2-hydroxycinnamic acid tert-butyl residue unit, α-cyano-3-hydroxycinnamic acid tert-butyl residue unit, α-cyano-4- Hydroxycinnamic acid tert-butyl residue unit, α-cyano-2-carboxycinnamic acid tert-butyl residue unit, α-cyano-3-carboxycinnamic acid tert-butyl residue unit, α-cyano-4 -Carboxycinnamic acid tert-butyl residue unit, α-cyano-4-sulfoxycinnamic acid tert-butyl residue unit, α-cyano-2-hydroxycinnamic acid (2 Methoxyethyl) residue unit, α-cyano-3-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-4-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano 2-carboxycarboxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-3-carboxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-4-carboxycinnamic acid (2- Methoxyethyl) residue units, α-cyano-4-sulfoxycinnamic acid (2-methoxyethyl) residue units, and the like.

Among the residue units represented by the general formula (1), 2-hydroxybenzylidene malononitrile residue unit, 3-hydroxybenzylidene is used in order to develop higher negative retardation and higher compatibility with different polymers. Malononitrile residue unit, 4-hydroxybenzylidenemalononitrile residue unit, 2,3-dihydroxybenzylidenemalononitrile residue unit, 2,4-dihydroxybenzylidenemalononitrile residue unit, 3,4-dihydroxybenzylidenemalononitrile residue Unit, 2-carboxybenzylidenemalononitrile residue unit, 3-carboxybenzylidenemalononitrile residue unit, 4-carboxybenzylidenemalononitrile residue unit, 2,3-dicarboxybenzylidenemalononitrile residue unit, 2,4-di Carboxybenzylidenema Nononitrile residue unit, 3,4-dicarboxybenzylidenemalononitrile residue unit, 4-sulfoxybenzylidenemalononitrile residue unit, 2,3-disulfoxybenzylidenemalononitrile residue unit, dimethyl 2-hydroxybenzylidenemalonate Residue unit, 3-hydroxybenzylidene malonate dimethyl residue unit, 4-hydroxybenzylidene malonate dimethyl residue unit, 2,3-dihydroxybenzylidene malonate dimethyl residue unit, 2,4-dihydroxybenzylidene malonate dimethyl residue Unit, dimethyl 3,4-dihydroxybenzylidene malonate residue unit, 2-carboxybenzylidene malonate dimethyl residue unit, 3-carboxybenzylidene malonate dimethyl residue unit, 4-carboxybenzylidene malonate dimethyl residue unit 2,3-dicarboxybenzylidene malonate dimethyl residue unit, 2,4-dicarboxybenzylidene malonate dimethyl residue unit, 3,4-dicarboxybenzylidene malonate dimethyl residue unit, 4-sulfoxybenzylidene malonate Dimethyl residue unit, 2-hydroxybenzylidene malonate diethyl residue unit, 3-hydroxybenzylidene malonate diethyl residue unit, 4-hydroxybenzylidene malonate diethyl residue unit, 2,3-dihydroxybenzylidene malonate diethyl residue unit 2,4-dihydroxybenzylidene malonate diethyl residue unit, 3,4-dihydroxybenzylidene malonate diethyl residue unit, 2-carboxybenzylidene malonate diethyl residue unit, 3-carboxybenzylidene malonate diethyl residue unit, 4 − Carboxybenzylidene malonate diethyl residue unit, 2,3-dicarboxybenzylidene malonate diethyl residue unit, 2,4-dicarboxybenzylidene malonate diethyl residue unit, 3,4-dicarboxybenzylidene malonate diethyl residue unit 4-sulfoxybenzylidene malonate diethyl residue unit, 2-hydroxybenzylidene malonate dipropyl residue unit, 3-hydroxybenzylidene malonate dipropyl residue unit, 4-hydroxybenzylidene malonate dipropyl residue unit, 2,3- Dihydroxybenzylidene malonate dipropyl residue unit, 2,4-dihydroxybenzylidene malonate dipropyl residue unit, 3,4-dihydroxybenzylidene malonate dipropyl residue unit, 2-carboxybenzylidene malonate dipropyl residue unit , 3-carboxybenzylidene malonate dipropyl residue unit, 4-carboxybenzylidene malonate dipropyl residue unit, 2,3-dicarboxybenzylidene malonate dipropyl residue unit, 2,4-dicarboxybenzylidene malonate dipropyl residue unit 3,4-dicarboxybenzylidene malonate dipropyl residue unit, 4-sulfoxybenzylidene malonate dipropyl residue unit, 2-hydroxybenzylidene malonate diisopropyl residue unit, 3-hydroxybenzylidene malonate diisopropyl residue unit, 4 -Hydroxybenzylidene malonate diisopropyl residue unit, 2,3-dihydroxybenzylidene malonate diisopropyl residue unit, 2,4-dihydroxybenzylidene malonate diisopropyl residue unit, 3,4-dihydroxy Benzylidenemalonate diisopropyl residue unit, 2-carboxybenzylidenemalonate diisopropyl residue unit, 3-carboxybenzylidenemalonate diisopropyl residue unit, 4-carboxybenzylidenemalonate diisopropyl residue unit, 2,3-dicarboxybenzylidenemalonate Diisopropyl residue unit, 2,4-dicarboxybenzylidene malonate diisopropyl residue unit, 3,4-dicarboxybenzylidene malonate diisopropyl residue unit, 4-sulfoxybenzylidene malonate diisopropyl residue unit, 2-hydroxybenzylidene malon Dibutyl residue unit, 3-hydroxybenzylidene malonate dibutyl residue unit, 4-hydroxybenzylidene malonate dibutyl residue unit, 2,3-dihydroxybenzylidene malonate di unit Butyl residue unit, 2,4-dihydroxybenzylidene malonate dibutyl residue unit, 3,4-dihydroxybenzylidene malonate dibutyl residue unit, 2-carboxybenzylidene malonate dibutyl residue unit, 3-carboxybenzylidene malonate dibutyl residue Group unit, 4-carboxybenzylidene malonate dibutyl residue unit, 2,3-dicarboxybenzylidene malonate dibutyl residue unit, 2,4-dicarboxybenzylidene malonate dibutyl residue unit, 3,4-dicarboxybenzylidene malon Dibutyl residue unit, 4-sulfoxybenzylidene malonate dibutyl residue unit, 2-hydroxybenzylidene malonate diisobutyl residue unit, 3-hydroxybenzylidene malonate diisobutyl residue unit, 4-hydroxybenzylidene malonate diiso Chill residue unit, 2,3-dihydroxybenzylidene malonate diisobutyl residue unit, 2,4-dihydroxybenzylidene malonate diisobutyl residue unit, 3,4-dihydroxybenzylidene malonate diisobutyl residue unit, 2-carboxybenzylidene malonate Diisobutyl residue unit, 3-carboxybenzylidene malonate diisobutyl residue unit, 4-carboxybenzylidene malonate diisobutyl residue unit, 2,3-dicarboxybenzylidene malonate diisobutyl residue unit, 2,4-dicarboxybenzylidene malonate Diisobutyl residue unit, 3,4-dicarboxybenzylidene malonate diisobutyl residue unit, 4-sulfoxybenzylidene malonate diisobutyl residue unit, 2-hydroxybenzylidene malonate disec-butyl residue 3-hydroxybenzylidenemalonate disec-butyl residue unit, 4-hydroxybenzylidenemalonate disec-butyl residue unit, 2,3-dihydroxybenzylidenemalonate disec-butyl residue unit, 2,4- Disec-benzylidene malonate disec-butyl residue unit, 3,4-dihydroxybenzylidene malonate disec-butyl residue unit, 2-carboxybenzylidene malonate disec-butyl residue unit, 3-carboxybenzylidene malonate disec -Butyl residue unit, 4-carboxybenzylidene malonate disec-butyl residue unit, 2,3-dicarboxybenzylidene malonate disec-butyl residue unit, 2,4-dicarboxybenzylidene malonate disec-butyl Residue unit, 3,4-dicarboxybenzylidene Disec-butyl malonate residue unit, 4-sulfoxybenzylidene malonate disec-butyl residue unit, 2-hydroxybenzylidene malonate ditert-butyl residue unit, 3-hydroxybenzylidene malonate ditert-butyl residue Group unit, 4-tert-butylidene malonate ditert-butyl residue unit, 2,3-dihydroxybenzylidene malonate ditert-butyl residue unit, 2,4-dihydroxybenzylidene malonate ditert-butyl residue unit, 3 , 4-Dihydroxybenzylidenemalonate ditert-butyl residue unit, 2-carboxybenzylidenemalonate ditert-butyl residue unit, 3-carboxybenzylidenemalonate ditert-butyl residue unit, 4-carboxybenzylidenemalonate dicarboxylate single tert-butyl residue 2,3-dicarboxybenzylidene malonate ditert-butyl residue unit, 2,4-dicarboxybenzylidene malonate ditert-butyl residue unit, 3,4-dicarboxybenzylidene malonate ditert-butyl residue Unit, 4-sulfoxybenzylidene malonate ditert-butyl residue unit, α-cyano-2-hydroxycinnamic acid residue unit, α-cyano-3-hydroxycinnamic acid residue unit, α-cyano-4 -Hydroxycinnamic acid residue unit, α-cyano-2-carboxycinnamic acid residue unit, α-cyano-3-carboxycinnamic acid residue unit, α-cyano-4-carboxycinnamic acid residue unit , Α-cyano-2-sulfoxycinnamic acid residue unit, α-cyano-3-sulfoxycinnamic acid residue unit, α-cyano-4-sulfoxycinnamic acid residue unit, α-sia Non-2-hydroxycinnamic acid methyl residue unit, α-cyano-3-hydroxycinnamic acid methyl residue unit, α-cyano-4-hydroxycinnamic acid methyl residue unit, α-cyano-2-carboxy Methyl cinnamate residue unit, α-cyano-3-carboxycinnamate methyl residue unit, α-cyano-4-carboxymethyl cinnamate residue unit, α-cyano-4-sulfoxycinnamate methyl residue Unit, ethyl α-cyano-2-hydroxycinnamate residue unit, ethyl α-cyano-3-hydroxycinnamate residue unit, α-cyano-4-hydroxyethyl cinnamic acid residue unit, α-cyano 2-carboxyethylcinnamate residue units, α-cyano-3-carboxycinnamate ethyl residue units, α-cyano-4-carboxyethylcinnamate residue units, α-cyano-2-sulfoxycinnax Ethyl residue unit, α-cyano-3-sulfoxycinnamic acid ethyl residue unit, α-cyano-4-sulfoxycinnamic acid ethyl residue unit, α-cyano-2-hydroxycinnamic acid propyl residue unit, α- Cyano-3-hydroxy cinnamate propyl residue unit, α-cyano-4-hydroxypropyl cinnamate residue unit, α-cyano-2-carboxypropyl cinnamate residue unit, α-cyano-3-carboxy Propyl cinnamate residue unit, α-cyano-4-carboxypropyl cinnamate residue unit, α-cyano-4-sulfoxy cinnamate propyl residue unit, α-cyano-2-hydroxyisopropyl cinnamate residue Units, isopropyl residue of α-cyano-3-hydroxycinnamate, isopropyl residue unit of α-cyano-4-hydroxycinnamate, α-cyano-2-carboxy Isopropyl cinnamate residue unit, α-cyano-3-carboxycinnamate isopropyl residue unit, α-cyano-4-carboxy cinnamate isopropyl residue unit, α-cyano-4-sulfoxycinnamate isopropyl residue Unit, α-cyano-2-hydroxycinnamate butyl residue unit, α-cyano-3-hydroxybutyl cinnamate residue unit, α-cyano-4-hydroxybutyl cinnamate residue unit, α-cyano 2-butyl carboxycinnamate residue unit, α-cyano-3-carboxy cinnamate butyl residue unit, α-cyano-4-carboxy butyl cinnamate residue unit, α-cyano-4-sulfoxycinnax Acid butyl residue unit, α-cyano-2-hydroxycinnamic acid isobutyl residue unit, α-cyano-3-hydroxycinnamic acid isobutyl residue unit, α-cyano-4-hydride Roxycinnamate isobutyl residue unit, α-cyano-2-carboxycinnamate isobutyl residue unit, α-cyano-3-carboxycinnamate isobutyl residue unit, α-cyano-4-carboxycinnamate isobutyl residue Base unit, α-cyano-4-sulfoxycinnamic acid isobutyl residue unit, α-cyano-2-hydroxycinnamic acid sec-butyl residue unit, α-cyano-3-hydroxycinnamic acid sec-butyl residue unit , Α-cyano-4-hydroxycinnamic acid sec-butyl residue unit, α-cyano-2-carboxycinnamic acid sec-butyl residue unit, α-cyano-3-carboxycinnamic acid sec-butyl residue unit Unit, α-cyano-4-carboxycinnamic acid sec-butyl residue unit, α-cyano-4-sulfoxycinnamic acid sec-butyl residue unit, α-cyano-2-hydroxy Roxycinnamic acid tert-butyl residue unit, α-cyano-3-hydroxycinnamic acid tert-butyl residue unit, α-cyano-4-hydroxycinnamic acid tert-butyl residue unit, α-cyano-2- Carboxycinnamic acid te
rt-butyl residue unit, α-cyano-3-carboxycinnamic acid tert-butyl residue unit, α-cyano-4-carboxycinnamic acid tert-butyl residue unit, α-cyano-4-sulfoxycinnamic acid tert-butyl residue unit, α-cyano-2-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-3-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano -4-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-2-carboxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-3-carboxycinnamic acid (2- Methoxyethyl) residue unit, α-cyano-4-carboxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-4-sulfoxycinnamic acid (2-methoxyethyl) residue unit are preferred 2-hydroxybenzylidenemalononitrile residue unit, 3-hydroxybenzylidenemalononitrile residue unit, 4-hydroxybenzylidenemalononitrile residue unit, 2,3-dihydroxybenzylidenemalononitrile residue unit, 2,4-dihydroxybenzylidenemalononitrile Residue unit, 3,4-dihydroxybenzylidenemalononitrile residue unit, 2-hydroxybenzylidenemalonate dimethyl residue unit, 3-hydroxybenzylidenemalonate dimethyl residue unit, 4-hydroxybenzylidenemalonate dimethyl residue unit, 2 , 3-Dihydroxybenzylidene malonate dimethyl residue unit, 2,4-dihydroxybenzylidene malonate dimethyl residue unit, 3,4-dihydroxybenzylidene malonate dimethyl residue unit, 2-hydroxyben Diethylidenemalonate diethyl residue unit, 3-hydroxybenzylidenemalonate diethyl residue unit, 4-hydroxybenzylidenemalonate diethyl residue unit, 2,3-dihydroxybenzylidenemalonate diethyl residue unit, 2,4-dihydroxybenzylidenemalonic acid Diethyl residue unit, 3,4-dihydroxybenzylidene malonate diethyl residue unit, 2-hydroxybenzylidene malonate dipropyl residue unit, 3-hydroxybenzylidene malonate dipropyl residue unit, 4-hydroxybenzylidene malonate dipropyl residue unit 2,3-dihydroxybenzylidene malonate dipropyl residue unit, 2,4-dihydroxybenzylidene malonate dipropyl residue unit, 3,4-dihydroxybenzylidene malonate dipropyl residue unit, 2-hydroxy Benzylidenemalonate diisopropyl residue unit, 3-hydroxybenzylidenemalonate diisopropyl residue unit, 4-hydroxybenzylidenemalonate diisopropyl residue unit, 2,3-dihydroxybenzylidenemalonate diisopropyl residue unit, 2,4-dihydroxybenzylidenemalone Diisopropyl residue unit, 3,4-dihydroxybenzylidene malonate diisopropyl residue unit, 2-hydroxybenzylidene malonate dibutyl residue unit, 3-hydroxybenzylidene malonate dibutyl residue unit, 4-hydroxybenzylidene malonate dibutyl residue Unit, 2,3-dihydroxybenzylidene malonate dibutyl residue unit, 2,4-dihydroxybenzylidene malonate dibutyl residue unit, 3,4-dihydroxybenzylidene malonate Butyl residue unit, 2-hydroxybenzylidene malonate diisobutyl residue unit, 3-hydroxybenzylidene malonate diisobutyl residue unit, 4-hydroxybenzylidene malonate diisobutyl residue unit, 2,3-dihydroxybenzylidene malonate diisobutyl residue unit 2,4-dihydroxybenzylidene malonate diisobutyl residue unit, 3,4-dihydroxybenzylidene malonate diisobutyl residue unit, 2-hydroxybenzylidene malonate disec-butyl residue unit, 3-hydroxybenzylidene malonate disec- Butyl residue unit, 4-hydroxybenzylidene malonate disec-butyl residue unit, 2,3-dihydroxybenzylidene malonate disec-butyl residue unit, 2,4-dihydroxybenzylidene malonate disec- Butyl residue unit, 3,4-dihydroxybenzylidene malonate disec-butyl residue unit, 2-hydroxybenzylidene malonate ditert-butyl residue unit, 3-hydroxybenzylidene malonate ditert-butyl residue unit, 4 -Di-tert-butyl residue of hydroxybenzylidene malonate, di-tert-butyl residue of 2,3-dihydroxybenzylidene malonate, di-tert-butyl residue of 2,4-dihydroxybenzylidene malonate, 3,4-dihydroxy Benzylidene malonate ditert-butyl residue unit, α-cyano-2-hydroxycinnamic acid residue unit, α-cyano-3-hydroxycinnamic acid residue unit, α-cyano-4-hydroxycinnamic acid residue Base unit, α-cyano-2-carboxycinnamic acid residue unit, α-cyano-3-carbo Xycinnamic acid residue unit, α-cyano-4-carboxycinnamic acid residue unit, α-cyano-2-sulfoxycinnamic acid residue unit, α-cyano-3-sulfoxycinnamic acid residue unit, α-cyano -4-sulfoxycinnamic acid residue unit, α-cyano-2-hydroxycinnamic acid methyl residue unit, α-cyano-3-hydroxycinnamic acid methyl residue unit, α-cyano-4-hydroxycinnamic acid Methyl residue unit, α-cyano-2-hydroxyethyl cinnamate residue unit, α-cyano-3-hydroxyethyl cinnamate residue unit, α-cyano-4-hydroxyethyl cinnamate residue unit, α-cyano-2-hydroxypropyl cinnamate residue unit, α-cyano-3-hydroxypropyl cinnamate residue unit, α-cyano-4-hydroxypropyl cinnamate residue unit, α-cyano-2 -Hydro Isopropyl cinnamate residue unit, isopropyl residue of α-cyano-3-hydroxycinnamate residue unit, isopropyl residue of α-cyano-4-hydroxycinnamate residue, butyl residue of α-cyano-2-hydroxycinnamate Base unit, α-cyano-3-hydroxycinnamate butyl residue unit, α-cyano-4-hydroxybutyl cinnamate residue unit, α-cyano-2-hydroxycinnamate isobutyl residue unit, α- Cyano-3-hydroxycinnamic acid isobutyl residue unit, α-cyano-4-hydroxycinnamic acid isobutyl residue unit, α-cyano-2-hydroxycinnamic acid sec-butyl residue unit, α-cyano-3 -Hydroxycinnamic acid sec-butyl residue unit, α-cyano-4-hydroxycinnamic acid sec-butyl residue unit, α-cyano-2-hydroxycinnamic acid tert Butyl residue unit, α-cyano-3-hydroxycinnamic acid tert-butyl residue unit, α-cyano-4-hydroxycinnamic acid tert-butyl residue unit, α-cyano-2-hydroxycinnamic acid ( 2-methoxyethyl) residue unit, α-cyano-3-hydroxycinnamic acid (2-methoxyethyl) residue unit, α-cyano-4-hydroxycinnamic acid (2-methoxyethyl) residue unit preferable. These residue units may be one kind or may contain two or more kinds.

  Since the polymer containing the monomer residue unit represented by the general formula (1) of the present invention expresses good optical properties, it is further represented by at least the general formula (2) to the general formula (4). Preferably it contains one or more monomeric residue units.

(Here, R _{9 to} R ₁₁ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, Carboxy group, ester group (—C (═O) OX ₁₉ or —CO (═O) —X ₂₀ ), amide group (—C (═O) N (X ₂₁ ) (X ₂₂ ) or —NX ₂₃ C ( ═O) X ₂₄ ) or an acyl group (—C (═O) X ₂₅ ) (wherein X _{19 to} X ₂₀ are each independently a linear alkyl group having 1 to 12 carbon atoms, 12 represents a branched alkyl group or a cyclic group having 3 to 14 carbon atoms, and X _{21 to} X ₂₅ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, or 1 to 12 carbon atoms. branched alkyl group or an cyclic group having a carbon number of 3 to 14,.) _{indicates, R 12} ~ ₁₆ are each independently hydrogen, halogen, straight-chain alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, cyclic group of 3 to 14 carbon atoms, a cyano group, a nitro group, hydroxy group , Carboxyl group, thiol group, alkoxy group (—OX ₂₆ ), ester group (—C (═O) OX ₂₇ or —CO (═O) —X ₂₈ ), amide group (—C (═O) N (X _{29) (X 30)} or _{-NX 31 C (= O) X} 32), an acyl group _{(-C (= O) X 33} ) or an amino group _{(-N (X 34) (X} 35)) ( where, X _{26 to} X ₂₈ each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{29 to} X _{28 35} are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms. A kill group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.) R _{12 to} R ₁₆ form a condensed ring structure with adjacent substituents. May be.)

(Here, R _{17 to} R ₁₉ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, Carboxy group, ester group (—C (═O) OX ₃₆ or —CO (═O) —X ₃₇ ), amide group (—C (═O) N (X ₃₈ ) (X ₃₉ ) or —NX ₄₀ C ( ═O) X ₄₁ ) or an acyl group (—C (═O) X ₄₂ ) (wherein X _{36 to} X ₃₇ are linear alkyl groups having 1 to 12 carbon atoms, branched alkyl having 1 to 12 carbon atoms) Group or a cyclic group having 3 to 14 carbon atoms, X _{38 to} X ₄₂ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, Or a cyclic group having 3 to 14 carbon atoms), and R _{20 to} R ₂₇ are respectively Independently hydrogen, halogen, linear alkyl group having 1 to 12 carbon atoms, branched alkyl group having 1 to 12 carbon atoms, cyclic group having 3 to 14 carbon atoms, cyano group, nitro group, hydroxy group, carboxy group , Thiol group, alkoxy group (—OX ₄₃ ), ester group (—C (═O) OX ₄₄ or —CO (═O) —X ₄₅ ), amide group (—C (═O) N (X ₄₆ ) ( X ₄₇ ) or —NX ₄₈ C (═O) X ₄₉ ), acyl group (—C (═O) X ₅₀ ) or amino group (—N (X ₅₁ ) (X ₅₂ )) (where X ₄₃ to X ₄₅ each independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{46 to} X ₅₂ are Each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, 1 carbon atom 12 branched alkyl group, or an indicating.) A cyclic group having a carbon number of 3 to 14. _Further, R 20 _{to R 27} may form a fused ring structure with adjacent _{substituents, R 20} And R ₂₆ and R ₂₁ and R ₂₇ may form a ring structure with the same atom.)

(Here, R _{28 to} R ₃₀ are each independently hydrogen, halogen, a linear hydrocarbon group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. , Ether group (—OX ₅₃ ), ester group (—C (═O) OX ₅₄ or —CO (═O) —X ₅₅ ), amide group (—C (═O) N (X ₅₆ ) (X ₅₇ ) or _{-NX 58 C (= O) X} 59), including acyl groups _{(-C (= O) X 60} ) or an amino group _{(-N (X 61) (X} 62)), or at least a carbon atom and a nitrogen atom A 5- to 7-membered cyclic group (wherein X _{53 to} X ₅₅ are each independently a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or carbon; Represents a cyclic group of formulas 3 to 14, and X _{56 to} X ₆₂ each independently represent hydrogen, charcoal A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.) R _{31 to} R ₃₄ are each independently hydrogen, halogen, A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, a cyano group, a nitro group, a hydroxy group, a carboxy group, a thiol group, an alkoxy group ( -OX _63), ester group (-C (= O) _{OX 64} or _{-CO (= O) -X 65)} , amide group _{(-C (= O) N (} X 66) (X 67) or _{-NX 68} C (═O) X ₆₉ ), acyl group (—C (═O) X ₇₀ ) or amino group (—N (X ₇₁ ) (X ₇₂ )) (where X _{63 to} X ₆₅ are each independently Straight chain alkyl group having 1 to 12 carbon atoms, branched chain having 1 to 12 carbon atoms An alkyl group or a cyclic group having 3 to 14 carbon atoms, wherein X _{66 to} X ₇₂ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, or a branched alkyl group having 1 to 12 carbon atoms; Or a cyclic group having 3 to 14 carbon atoms.) R _{31 to} R ₃₄ may form a condensed ring structure with adjacent substituents, and R ₃₁ , R ₃₂ and R ₃₃ R ₃₄ may form a ring structure with the same atom.)
R _{9 to} R ₁₁ in the general formula (2) of the present invention are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 to 3 carbon atoms. 14 cyclic groups, carboxy groups, ester groups (—C (═O) OX ₁₉ or —CO (═O) —X ₂₀ ), amide groups (—C (═O) N (X ₂₁ ) (X ₂₂ ) or —NX ₂₃ C (═O) X ₂₄ ) or an acyl group (—C (═O) X ₂₅ ) (where X _{19 to} X ₂₀ are each independently a linear alkyl group having 1 to 12 carbon atoms. Represents a branched alkyl group having 1 to 12 carbon atoms or a cyclic group having 3 to 14 carbon atoms, and X _{21 to} X ₂₅ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, carbon A branched alkyl group having 1 to 12 carbon atoms or a cyclic group having 3 to 14 carbon atoms is shown.) Indicates.

Examples of the halogen in R _{9 to} R ₁₁ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- C1-C12 branched alkyl groups, such as a butyl group, are mentioned, As a C3-C14 cyclic group, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, phenyl, for example Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group, etc. Specific examples of the ester group include a methyloxycarbonyl group, an ethyloxycarbonyl group, an acetoxy group, and a propoxy group. Specific examples of the amide group include: For example, a dimethylamide group, a diethylamide group, etc. are mentioned, As a specific acyl group, an acetyl group, a propionyl group, a benzoyl group etc. are mentioned, for example.

R _{12 to} R ₁₆ in the general formula (2) of the present invention are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 to 3 carbon atoms. 14 cyclic groups, cyano group, nitro group, hydroxy group, carboxy group, thiol group, alkoxy group (—OX ₂₆ ), ester group (—C (═O) OX ₂₇ or —CO (═O) —X ₂₈ ) An amide group (—C (═O) N (X ₂₉ ) (X ₃₀ ) or —NX ₃₁ C (═O) X ₃₂ ), an acyl group (—C (═O) X ₃₃ ) or an amino group (—N (X ₃₄ ) (X ₃₅ )) (where X _{26 to} X ₂₈ are each independently a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or the number of carbon atoms. 3 to 14 cyclic groups, and X _{29 to} X ₃₅ are each German And hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. R _{12 to} R ₁₆ may form a condensed ring structure with adjacent substituents.

Examples of the halogen in R _{12 to} R ₁₆ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group Specific examples of the alkoxy group include a methoxy group and an ethoxy group, and specific ester groups include, for example, a methyloxycarbonyl group, ethyloxy group, and the like. Examples include carbonyl group, acetoxy group, propoxy group, and the like. Specific examples of the amide group include dimethylamide group and diethylamide group. Specific examples of the acyl group include acetyl group, propionyl group, and the like. A benzoyl group etc. are mentioned, As a specific amino group, a dimethylamino group, a diethylamino group, etc. are mentioned, for example.

Examples of the linear alkyl group having 1 to 12 carbon atoms in X _{19 to} X ₃₃ include a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, and an n-hexyl group. Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, sec-butyl group, tert-butyl group, isobutyl group and the like, and examples of the cyclic group having 3 to 14 carbon atoms include: A cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a phenyl group, a naphthyl group, etc. are mentioned.

  Specific monomer residue units represented by the general formula (2) include, for example, 2-methylstyrene residue units, 3-methylstyrene residue units, 4-methylstyrene residue units, 2 -Hydroxystyrene residue unit, 4-tert-butoxystyrene residue unit, 3-hydroxystyrene residue unit, 4-hydroxystyrene residue unit, 4-cyanostyrene residue unit, 4-nitrostyrene residue unit, 2 -Vinylbenzoic acid residue unit, 4-vinylbenzoic acid residue unit, 4-methoxystyrene residue unit, 4-acetoxystyrene residue unit, 4-vinylbenzoic acid methyl residue unit, 4-iodostyrene residue unit , 4-bromostyrene, 4-chlorostyrene, styrene residue units such as 4-vinylbiphenyl, α, β, β-ha, such as α, β, β-trifluorostyrene residue units, etc. Genated styrenes residue unit, 1-vinylnaphthalene residue unit, vinylnaphthalene residue unit such as 2-vinylnaphthalene residue unit, α-methylstyrene residue unit, trans-stilbene residue unit, anethole Residue units, cinnamic acid ester residue units such as methyl cinnamate, ethyl cinnamate and ethyl 4-methoxycinnamate, cinnamic acid residues such as cinnamic acid and 4-methoxycinnamic acid Examples include units. Among these, in order to develop higher negative retardation and higher compatibility with different polymers, styrene residue units and vinylnaphthalene residue units are preferable, styrene residue units, 2-methylstyrene residues. Unit, 3-methylstyrene residue unit, 4-methylstyrene residue unit, 4-phenylstyrene residue unit, 2-methoxystyrene residue unit, 3-methoxystyrene residue unit, 4-methoxystyrene residue unit, 4-tert-butoxystyrene residue units, 1-vinylnaphthalene residue units, and 2-vinylnaphthalene residue units are more preferred.

R _{17 to} R ₁₉ in the general formula (3) of the present invention are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 carbon atoms. to 14 cyclic group, a carboxyl group, an ester group (-C (= O) _{OX 36} or _{-CO (= O) -X 37)} , amide group _{(-C (= O) N (} X 38) (X 39) Or —NX ₄₀ C (═O) X ₄₁ ) or an acyl group (—C (═O) X ₄₂ ) (where X _{36 to} X ₃₇ are linear alkyl groups having 1 to 12 carbon atoms, 1 carbon atom) Represents a branched alkyl group having 12 to 12 or a cyclic group having 3 to 14 carbon atoms, and X _{38 to} X ₄₂ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, or 1 to 12 carbon atoms. A branched alkyl group or a cyclic group having 3 to 14 carbon atoms.

Examples of the halogen in R _{17 to} R ₁₉ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group And a specific ester group includes, for example, a methyloxycarbonyl group, an ethyloxycarbonyl group, an acetoxy group, a propoxy group, and the like. Examples thereof include a dimethylamide group and a diethylamide group. Specific examples of the acyl group include an acetyl group, a propionyl group, and a benzoyl group.

In the general formula (3) in the present invention, R _{20 to} R ₂₇ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a carbon number. 3-14 cyclic group, cyano group, nitro group, hydroxy group, carboxy group, thiol group, alkoxy group (—OX ₄₃ ), ester group (—C (═O) OX ₄₄ or —CO (═O) —X ₄₅ ), an amide group (—C (═O) N (X ₄₆ ) (X ₄₇ ) or —NX ₄₈ C (═O) X ₄₉ ), an acyl group (—C (═O) X ₅₀ ) or an amino group ( —N (X ₅₁ ) (X ₅₂ )) (where X _{43 to} X ₄₅ are each independently a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or A cyclic group having 3 to 14 carbon atoms, and X _{46 to} X ₅₂ are , Each independently represents hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. R _{20 to} R ₂₇ may form a condensed ring structure with adjacent substituents, and R ₂₀ and R ₂₆ and R ₂₁ and R ₂₇ may form a ring structure with the same atom.

Examples of the halogen in R _{20 to} R ₂₇ include fluorine, chlorine, bromine and the like. Examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group Specific examples of the alkoxy group include a methoxy group and an ethoxy group, and specific ester groups include, for example, a methyloxycarbonyl group, ethyloxy group, and the like. Examples include carbonyl group, acetoxy group, propoxy group, and the like. Specific examples of the amide group include dimethylamide group and diethylamide group. Specific examples of the acyl group include acetyl group, propionyl group, and the like. A benzoyl group etc. are mentioned, As a specific amino group, a dimethylamino group, a diethylamino group, etc. are mentioned.

Examples of the linear alkyl group having 1 to 12 carbon atoms in X ₃₆ to X _52, for example, mentioned a methyl group, an ethyl group, n- propyl group, n- butyl group, n- pentyl group, n- hexyl and the like Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, sec-butyl group, tert-butyl group, isobutyl group and the like, and examples of the cyclic group having 3 to 14 carbon atoms include: A cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a phenyl group, a naphthyl group, etc. are mentioned.

  Specific examples of the monomer residue unit represented by the general formula (3) include indole residues such as an N-vinylindole residue unit and an N-methyl-3-vinylindole residue unit. Examples thereof include N-vinylcarbazole residue units such as units, N-vinylcarbazole residue units, 3-methyl-N-vinylcarbazole, and 3-chloro-N-vinylcarbazole. Among these, an N-vinylcarbazole residue unit is preferable, and N-vinylcarbazole is more preferable in order to develop higher negative retardation and higher compatibility with different polymers.

_R 28 _{to R 30} in the general formula (4) in the present invention, hydrogen, halogen, straight-chain hydrocarbon group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, 3 to 14 carbon atoms Cyclic group, ether group (—OX ₅₃ ), ester group (—C (═O) OX ₅₄ or —CO (═O) —X ₅₅ ), amide group (—C (═O) N (X ₅₆ ) (X ₅₇₎ or _{-NX 58 C (= O) X} 59), an acyl group _{(-C (= O) X 60} ), an amino group _{(-N (X 61) (X} 62)) or at least a carbon atom and a nitrogen atom 5 to 7-membered cyclic group is included. (Here, X _{53 to} X ₅₅ each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, X _{56 to} X ₆₂ each independently represent hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.
Examples of the halogen in R _{28 to} R ₃₀ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group Specific examples of the ether group include a methyl ether group, an ethyl ether group, a propyl ether group, an isopropyl ether group, a butyl ether, an isobutyl ether group, a sec-butyl ether group, and a tert-butyl group. A butyl ether group, a cyclohexyl ether group, a phenyl ether group, a benzyl ether group and the like can be mentioned, and specific ester groups include, for example, a methyloxycarbonyl group, an ethyloxycarbonyl group, an acetoxy group, a propoxy group and the like. Specific examples of the amide group include a dimethylamide group and a diethylamide group. Specific examples of the acyl group include an acetyl group, a propionyl group, and a benzoyl group. Specific examples of the amino group include , Dimethylamino group, diethyl Mino group, and the like.

In the general formula (4) in the present invention, R _{31 to} R ₃₄ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a carbon number. 3-14 cyclic groups, cyano group, nitro group, hydroxy group, carboxy group, thiol group, alkoxy group (—OX ₆₃ ), ester group (—C (═O) OX ₆₄ or —CO (═O) —X _65), an amide group _{(-C (= O) N (} X 66) (X 67) or _{-NX 68 C (= O) X} 69), an acyl group (-C (= _{O) X 70)} or an amino group ( —N (X ₇₁ ) (X ₇₂ )) (where X _{63 to} X ₆₅ are each independently a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or A cyclic group having 3 to 14 carbon atoms, and X _{66 to} X ₇₂ are , Each independently represents hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. R _{31 to} R ₃₄ may form a condensed ring structure with adjacent substituents, and R ₃₁ and R ₃₂ and R ₃₃ and R ₃₄ may form a ring structure with the same atom.

Examples of the halogen in R _{31 to} R ₃₄ include fluorine, chlorine, bromine and the like, and examples of the linear alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include linear alkyl groups having 1 to 12 carbon atoms such as pentyl group and hexyl group. Examples of branched alkyl groups having 1 to 12 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert- Examples thereof include branched alkyl groups having 1 to 12 carbon atoms such as a butyl group. Examples of the cyclic group having 3 to 14 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cyclopentanyl group, and a phenyl group. Group, naphthyl group, anthryl group, furyl group, pyranyl group, pyrrolyl group, imidazolyl group, pyridyl group, indolyl group, carbazolyl group Specific examples of the alkoxy group include a methoxy group and an ethoxy group, and specific ester groups include, for example, a methyloxycarbonyl group, ethyloxy group, and the like. Examples include carbonyl group, acetoxy group, propoxy group, and the like. Specific examples of the amide group include dimethylamide group and diethylamide group. Specific examples of the acyl group include acetyl group, propionyl group, and the like. A benzoyl group etc. are mentioned, As a specific amino group, a dimethylamino group, a diethylamino group, etc. are mentioned.

Examples of the linear alkyl group having 1 to 12 carbon atoms in X ₅₃ to X _72, for example, mentioned a methyl group, an ethyl group, n- propyl group, n- butyl group, n- pentyl group, n- hexyl and the like Examples of the branched alkyl group having 1 to 12 carbon atoms include isopropyl group, sec-butyl group, tert-butyl group, isobutyl group and the like, and examples of the cyclic group having 3 to 14 carbon atoms include: A cyclopropyl group, a cyclobutyl group, a cyclohexyl group, a phenyl group, a naphthyl group, etc. are mentioned.

  Specific examples of the monomer residue unit represented by the general formula (4) include N-vinyl succinimide residue units such as N-vinyl succinimide residue units, and N-vinyl phthalimide residue units. N-vinylphthalimide residue units such as 4-methylphthalimide residue units, 4-chloromethylphthalimide residue units, 4-nitrophthalimide residue units, N-vinyl 2,3-naphthalenedicarboximide residue units And N-vinyl naphthalene dicarboxyimides such as N-vinyl 1,8-naphthalenedicarboximide residue units. Among these, N-vinylphthalimide residue units are preferable, and N-vinylphthalimide residue units are more preferable in order to express higher negative retardation and higher compatibility with different polymers.

  Although there is no restriction | limiting in particular about the manufacturing method of the polymer of this invention, For example, the manufacturing method which superposes | polymerizes the monomer represented by General formula (5) is mentioned.

(Where R _{1 and} R ₂ are hydrogen (except when R ₁ and R ₂ are both hydrogen), halogen, a linear alkyl group having 1 to 12 carbon atoms, and a branch having 1 to 12 carbon atoms. Alkyl group, cyclic group having 3 to 14 carbon atoms, cyano group, carboxy group, ester group (—C (═O) OX ₁ or —CO (═O) —X ₂ ), alkoxy group (—OX ₃ ) or Amide group (—C (═O) N (X ₄ ) (X ₅ ) or —NX ₆ C (═O) X ₇ ) (wherein X _{1 to} X ₃ each independently represents 1 to 12 carbon atoms) A linear alkyl group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{4 to} X ₇ are each independently hydrogen, a straight chain having 1 to 12 carbon atoms. A chain alkyl group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms is shown.) R ₃ represents hydrogen or halogen, R _{4 to} R ₈ represent hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 to 14 carbon atoms. Cyclic group, hydroxy group, carboxy group, sulfoxy group, nitro group, cyano group, thiol group, ester group (—C (═O) OX ₈ or —CO (═O) —X ₉ ), alkoxy group (—OX) ₁₀ ), an amide group (—C (═O) N (X ₁₁ ) (X ₁₂ ) or —NX ₁₃ C (═O) X ₁₄ ), an acyl group (—C (═O) X ₁₅ ), an amino group ( —N (X ₁₆ ) (X ₁₇ )) or a sulfonyl group (—SOOX ₁₈ ) (where X _{8 to} X ₁₀ are each independently a linear alkyl group having 1 to 12 carbon atoms, 12 branched alkyl groups or C 3-14 cyclic groups X _{11 to} X ₁₈ each independently represent hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. And at least one of R _{4 to} R ₈ represents one or more selected from a hydroxy group, a carboxy group, and a sulfoxy group, and R _{4 to} R ₈ form a condensed ring structure with adjacent substituents. You may do it.)
Specific monomers in the general formula (5) of the present invention include, for example, 2-hydroxy-α, β, β-trifluorostyrene, 3-hydroxy-α, β, β-trifluorostyrene, 4- Hydroxy-α, β, β-trifluorostyrene, 2-carboxy-α, β, β-trifluorostyrene, 3-carboxy-α, β, β-trifluorostyrene, 4-carboxy-α, β, β- Trifluorostyrene, 4-sulfoxy-α, β, β-trifluorostyrene, 2,3-dihydroxy-α, β, β-trifluorostyrene, 2,4-dihydroxy-α, β, β-trifluorostyrene, 3,4-dihydroxy-α, β, β-trifluorostyrene, 2-hydroxycinnamonitrile, 3-hydroxycinnamonitrile, 4-hydroxycinnamonitrile, 2-carboxy Cinnamonitrile, 3-hydroxycinnamonitrile, 4-hydroxycinnamonitrile, 2-carboxycinnamonitrile, 3-carboxycinnamonitrile, 4-carboxycinnamonitrile, 4-sulfoxycinnamonitrile, 2-hydroxy Cinnamic acid, 3-hydroxycinnamic acid, 4-hydroxycinnamic acid, 2-carboxycinnamic acid, 3-carboxycinnamic acid, 4-carboxycinnamic acid, 2-sulfoxycinnamic acid, 3-sulfoxycinnamic acid 4-sulfoxycinnamic acid, methyl 2-hydroxycinnamic acid, methyl 3-hydroxycinnamic acid, methyl 4-hydroxycinnamic acid, methyl 2-carboxycinnamic acid, methyl 3-carboxycinnamic acid, 4-carboxy Methyl cinnamate, 4-sulfoxymethyl cinnamate, ethyl 2-hydroxycinnamate Ethyl 3-hydroxycinnamate, ethyl 4-hydroxycinnamate, ethyl 2-carboxycinnamate, ethyl 3-carboxycinnamate, ethyl 4-carboxycinnamate, ethyl 4-sulfoxycinnamate, 2-hydroxy Propyl cinnamate, 3-hydroxy cinnamate propyl, 4-hydroxy cinnamate propyl, 2-carboxy cinnamate propyl, 3-carboxy cinnamate propyl, 4-carboxy cinnamate propyl, 4-sulfoxy cinnamate Propyl, 2-hydroxy-α, β, β-trifluoro-1-vinylnaphthalene, 3-hydroxy-α, β, β-trifluoro-1-vinylnaphthalene, 4-hydroxy-α, β, β-trifluoro -1-vinylnaphthalene, 2-carboxy-α, β, β-trifluoro-1-vinylnaphthalene, 3-carboxy -Α, β, β-trifluoro-1-vinylnaphthalene, 4-carboxy-α, β, β-trifluoro-1-vinylnaphthalene, 4-sulfoxy-α, β, β-trifluoro-1-vinylnaphthalene 2,3-dihydroxy-α, β, β-trifluoro-1-vinylnaphthalene, 2,4-dihydroxy-α, β, β-trifluoro-1-vinylnaphthalene, 3,4-dihydroxy-α, β , Β-trifluoro-1-vinylnaphthalene, 2-hydroxy-β-cyano-1-vinylnaphthalene, 3-hydroxy-β-cyano-1-vinylnaphthalene, 4-hydroxy-β-cyano-1-vinylnaphthalene, 2-carboxy-β-cyano-1-vinylnaphthalene, 3-hydroxy-β-cyano-1-vinylnaphthalene, 4-hydroxy-β-cyano-1-vinylnaphthalene 2-carboxy-β-cyano-1-vinylnaphthalene, 3-carboxy-β-cyano-1-vinylnaphthalene, 4-carboxy-β-cyano-1-vinylnaphthalene, 4-sulfoxy-β-cyano-1 -Vinylnaphthalene, β- (2-hydroxy-1-naphthyl) acrylic acid, β- (3-hydroxy-1-naphthyl) acrylic acid, β- (4-hydroxy-1-naphthyl) acrylic acid, β- (2 -Carboxy-1-naphthyl) acrylic acid, β- (3-carboxy-1-naphthyl) acrylic acid, β- (4-carboxy-1-naphthyl) acrylic acid, β- (2-sulfoxy-1-naphthyl) acrylic Acid, β- (3-sulfoxy-1-naphthyl) acrylic acid, β- (4-sulfoxy-1-naphthyl) acrylic acid, β- (2-hydroxy-1-naphthyl) a Methyl lylate, methyl β- (3-hydroxy-1-naphthyl) acrylate, methyl β- (4-hydroxy-1-naphthyl) acrylate, methyl β- (2-carboxy-1-naphthyl) acrylate, β -(3-carboxy-1-naphthyl) methyl acrylate, β- (4-carboxy-1-naphthyl) methyl acrylate, β- (4-sulfoxy-1-naphthyl) methyl acrylate, β- (2-hydroxy -1-naphthyl) ethyl acrylate, β- (3-hydroxy-1-naphthyl) ethyl acrylate, β- (4-hydroxy-1-naphthyl) ethyl acrylate, β- (2-carboxy-1-naphthyl) Ethyl acrylate, β- (3-carboxy-1-naphthyl) ethyl acrylate, β- (4-carboxy-1-naphthyl) ethyl acrylate, β- (4-s Rufoxy-1-naphthyl) ethyl acrylate, β- (2-hydroxy-1-naphthyl) propyl acrylate, β- (3-hydroxy-1-naphthyl) propyl acrylate, β- (4-hydroxy-1-naphthyl) ) Propyl acrylate, β- (2-carboxy-1-naphthyl) propyl acrylate, β- (3-carboxy-1-naphthyl) propyl acrylate, β- (4-carboxy-1-naphthyl) propyl acrylate, β- (4-sulfoxy-1-naphthyl) acrylic acid propyl, 2-hydroxycinnamamide, 3-hydroxycinnamamide, 4-hydroxycinnamamide, 2-carboxycinnamamide, 3-carboxycinnamamide, 4-carboxycinnamamide, 2-sulfoxycinnamamide, 3-sulfoxycinnamami 4-sulfoxycinnamamide, N, N-dimethyl-2-hydroxycinnamamide, N, N-dimethyl-3-hydroxycinnamamide, N, N-dimethyl-4-hydroxycinnamamide, N, N -Dimethyl-2-carboxycinnamamide, N, N-dimethyl-3-carboxycinnamamide, N, N-dimethyl-4-carboxycinnamamide, N, N-dimethyl-4-sulfoxycinnamamide, N , N-diethyl 2-hydroxycinnamamide, N, N-diethyl 3-hydroxycinnamamide, N, N-diethyl 4-hydroxycinnamamide, N, N-diethyl 2-carboxycinnamamide, N, N Diethyl 3-carboxycinnamamide, N, N-diethyl 4-carboxycinnamamide, N, N-diethyl 4-sul Rufoxycinnamamide, 2-hydroxy-β-methylstyrene, 3-hydroxy-β-methylstyrene, 4-hydroxy-β-methylstyrene, 2-carboxy-β-methylstyrene, 3-carboxy-β-methylstyrene, 4-carboxy-β-methylstyrene, 2-sulfoxy-β-methylstyrene, 3-sulfoxy-β-methylstyrene, 4-sulfoxy-β-methylstyrene, 2-hydroxybenzylidenemalononitrile, 3-hydroxybenzylidenemalononitrile, 4-hydroxybenzylidenemalononitrile, 2,3-dihydroxybenzylidenemalononitrile, 2,4-dihydroxybenzylidenemalononitrile, 3,4-dihydroxybenzylidenemalononitrile, 2-carboxybenzylidenemalononitrile, 3-carboxyl Benzylidenemalononitrile, 4-carboxybenzylidenemalononitrile, 2,3-dicarboxybenzylidenemalononitrile, 2,4-dicarboxybenzylidenemalononitrile, 3,4-dicarboxybenzylidenemalononitrile, 4-sulfoxybenzylidenemalononitrile, 2 -Dimethyl hydroxybenzylidenemalonate, dimethyl 3-hydroxybenzylidenemalonate, dimethyl 4-hydroxybenzylidenemalonate, dimethyl 2,3-dihydroxybenzylidenemalonate, dimethyl 2,4-dihydroxybenzylidenemalonate, 3,4-dihydroxybenzylidenemalon Dimethyl acid, dimethyl 2-carboxybenzylidene malonate, dimethyl 3-carboxybenzylidene malonate, dimethyl 4-carboxybenzylidene malonate Dimethyl 2,3-dicarboxybenzylidenemalonate, dimethyl 2,4-dicarboxybenzylidenemalonate, dimethyl 3,4-dicarboxybenzylidenemalonate, dimethyl 4-sulfoxybenzylidenemalonate, 2-hydroxybenzylidenemalonic acid Diethyl, diethyl 3-hydroxybenzylidenemalonate, diethyl 4-hydroxybenzylidenemalonate, diethyl 2,3-dihydroxybenzylidenemalonate, diethyl 2,4-dihydroxybenzylidenemalonate, diethyl 3,4-dihydroxybenzylidenemalonate, 2- Diethyl carboxybenzylidene malonate, diethyl 3-carboxybenzylidene malonate, diethyl 4-carboxybenzylidene malonate, diethyl 2,3-dicarboxybenzylidene malonate, 2, 4-dicarboxybenzylidenemalonate diethyl, 3,4-dicarboxybenzylidenemalonate diethyl, 4-sulfoxybenzylidenemalonate diethyl, 2-hydroxybenzylidenemalonate dipropyl, 3-hydroxybenzylidenemalonate dipropyl, 4-hydroxybenzylidenemalon Dipropyl acid, dipropyl 2,3-dihydroxybenzylidenemalonate, dipropyl 2,4-dihydroxybenzylidenemalonate, dipropyl 3,4-dihydroxybenzylidenemalonate, dipropyl 2-carboxybenzylidenemalonate, dipropyl 3-carboxybenzylidenemalonate, 4 -Dipropyl carboxybenzylidene malonate, dipropyl 2,3-dicarboxybenzylidene malonate, dipropyl 2,4-dicarboxybenzylidene malonate Lopyl, 3,4-dicarboxybenzylidenemalonate dipropyl, 4-sulfoxybenzylidenemalonate dipropyl, 2-hydroxybenzylidenemalonate diisopropyl, 3-hydroxybenzylidenemalonate diisopropyl, 4-hydroxybenzylidenemalonate diisopropyl, 2,3- Diisopropyl dihydroxybenzylidene malonate, diisopropyl 2,4-dihydroxybenzylidene malonate, diisopropyl 3,4-dihydroxybenzylidene malonate, diisopropyl 2-carboxybenzylidene malonate, diisopropyl 3-carboxybenzylidene malonate, diisopropyl 4-carboxybenzylidene malonate, 2,3-dicarboxybenzylidene malonate diisopropyl, 2,4-dicarboxybenzylidene dimer Diisopropyl 3,4-dicarboxybenzylidene malonate diisopropyl, 4-sulfoxybenzylidene malonate diisopropyl, 2-hydroxybenzylidene malonate dibutyl, 3-hydroxybenzylidene malonate dibutyl, 4-hydroxybenzylidene malonate dibutyl, 2, 3-dihydroxybenzylidenemalonate dibutyl, 2,4-dihydroxybenzylidenemalonate dibutyl, 3,4-dihydroxybenzylidenemalonate dibutyl, 2-carboxybenzylidenemalonate dibutyl, 3-carboxybenzylidenemalonate dibutyl, 4-carboxybenzylidenemalonate Dibutyl, 2,3-dicarboxybenzylidene malonate dibutyl, 2,4-dicarboxybenzylidene malonate dibutyl, 3,4-dicarboxybenzyl Redenemalonate dibutyl, 4-sulfoxybenzylidenemalonate dibutyl, 2-hydroxybenzylidenemalonate diisobutyl, 3-hydroxybenzylidenemalonate diisobutyl, 4-hydroxybenzylidenemalonate diisobutyl, 2,3-dihydroxybenzylidenemalonate diisobutyl, 2,4 Diisobutyl dihydroxybenzylidene malonate, diisobutyl 3,4-dihydroxybenzylidene malonate, diisobutyl 2-carboxybenzylidene malonate, diisobutyl 3-carboxybenzylidene malonate, diisobutyl 4-carboxybenzylidene malonate, 2,3-dicarboxybenzylidene malonate Diisobutyl, 2,4-dicarboxybenzylidenemalonic acid diisobutyl, 3,4-dicarboxybenzylidenemalonic acid Isobutyl, 4-sulphoxide benzylidene diisobutyl, butyl sec- 2-hydroxy benzylidene malonate, 3-hydroxy benzylidene malonate sec- butyl, 4
-Disec-butyl hydroxybenzylidenemalonate, disec-butyl 2,3-dihydroxybenzylidenemalonate, disec-butyl 2,4-dihydroxybenzylidenemalonate, disec-butyl 3,4-dihydroxybenzylidenemalonate, 2, -Disec-butyl carboxybenzylidenemalonate, disec-butyl 3-carboxybenzylidenemalonate, disec-butyl 4-carboxybenzylidenemalonate, disec-butyl 2,3-dicarboxybenzylidenemalonate, 2,4- Disec-butyl dicarboxybenzylidenemalonate, disec-butyl 3,4-dicarboxybenzylidenemalonate, disec-butyl 4-sulfoxybenzylidenemalonate, ditert-butyl 2-hydroxybenzylidenemalonate, 3- Roxybenzylidenemalonate ditert-butyl, 4-hydroxybenzylidenemalonate ditert-butyl, 2,3-dihydroxybenzylidenemalonate ditert-butyl, 2,4-dihydroxybenzylidenemalonate ditert-butyl, 3,4- Ditert-butyl dihydroxybenzylidenemalonate, ditert-butyl 2-carboxybenzylidenemalonate, ditert-butyl 3-carboxybenzylidenemalonate, ditert-butyl 4-carboxybenzylidenemalonate, 2,3-dicarboxybenzylidenemalon Di-tert-butyl 2,4-dicarboxybenzylidene malonate di-tert-butyl 3,4-dicarboxybenzylidene malonate di-tert-butyl 4-sulfoxybenzylidene malonate diter -Butyl, α-cyano-2-hydroxycinnamic acid, α-cyano-3-hydroxycinnamic acid, α-cyano-4-hydroxycinnamic acid, α-cyano-2-carboxycinnamic acid, α-cyano -3-carboxycinnamic acid, α-cyano-4-carboxycinnamic acid, α-cyano-4-sulfoxycinnamic acid, methyl α-cyano-2-hydroxycinnamic acid, α-cyano-3-hydroxycinnamic acid Acid methyl, methyl α-cyano-4-hydroxycinnamate, methyl α-cyano-2-carboxycinnamate, methyl α-cyano-3-carboxycinnamate, methyl α-cyano-4-carboxycinnamate Α-cyano-4-sulfoxycinnamic acid methyl, α-cyano-2-hydroxycinnamic acid ethyl, α-cyano-3-hydroxycinnamic acid ethyl, α-cyano-4-hydroxycinnamic acid , Ethyl α-cyano-2-carboxycinnamate, ethyl α-cyano-3-carboxycinnamate, ethyl α-cyano-4-carboxycinnamate, ethyl α-cyano-4-sulfoxycinnamate, α -Propyl cyano-2-hydroxycinnamate, propyl α-cyano-3-hydroxycinnamate, propyl α-cyano-4-hydroxycinnamate, α-cyano-2-carboxypropyl cinnamate, α-cyano -3-Carboxycinnamic acid propyl, α-cyano-4-carboxycinnamic acid propyl, α-cyano-4-sulfoxycinnamic acid propyl, α-cyano-2-hydroxycinnamic acid isopropyl, α-cyano-3- Isopropyl hydroxycinnamate, Isopropyl α-cyano-4-hydroxycinnamate, Isopropyl α-cyano-2-carboxycinnamate, α- Isopropyl ano-3-carboxycinnamate, isopropyl α-cyano-4-carboxycinnamate, isopropyl α-cyano-4-sulfoxycinnamate, butyl α-cyano-2-hydroxycinnamate, α-cyano-3 -Butyl hydroxy cinnamate, butyl α-cyano-4-hydroxycinnamate, butyl α-cyano-2-carboxy cinnamate, butyl α-cyano-3-carboxy cinnamate, α-cyano-4-carboxy Butyl cinnamate, butyl α-cyano-4-sulfoxycinnamate, isobutyl α-cyano-2-hydroxycinnamate, isobutyl α-cyano-3-hydroxycinnamate, α-cyano-4-hydroxycinnamic acid Isobutyl, α-cyano-2-carboxycinnamate, isobutyl α-cyano-3-carboxycinnamate, α-cyano- -Isobutyl carboxycinnamate, isobutyl α-cyano-4-sulfoxycinnamate, sec-butyl α-cyano-2-hydroxycinnamate, sec-butyl α-cyano-3-hydroxycinnamate, α-cyano- 4-hydroxycinnamic acid sec-butyl, α-cyano-2-carboxycinnamic acid sec-butyl, α-cyano-3-carboxycinnamic acid sec-butyl, α-cyano-4-carboxycinnamic acid sec-butyl Butyl, α-cyano-4-sulfoxycinnamate sec-butyl, tert-butyl α-cyano-2-hydroxycinnamate, tert-butyl α-cyano-3-hydroxycinnamate, α-cyano-4-hydroxy Tert-Butyl cinnamate, tert-butyl α-cyano-2-carboxycinnamate, α-cyano-3-carboxycinnamate te t-butyl, α-cyano-4-carboxycinnamic acid tert-butyl, α-cyano-4-sulfoxycinnamic acid tert-butyl, α-cyano-2-hydroxycinnamic acid (2-methoxyethyl), α- Cyano-3-hydroxycinnamic acid (2-methoxyethyl), α-cyano-4-hydroxycinnamic acid (2-methoxyethyl), α-cyano-2-carboxycinnamic acid (2-methoxyethyl), α -Cyano-3-carboxycinnamic acid (2-methoxyethyl), α-cyano-4-carboxycinnamic acid (2-methoxyethyl), α-cyano-4-sulfoxycinnamic acid (2-methoxyethyl), etc. Can be mentioned.

Among the monomers represented by the general formula (5), 2-hydroxybenzylidene malononitrile, 3-hydroxybenzylidene malononitrile, in order to express higher negative retardation and higher compatibility with different polymers, 4-hydroxybenzylidenemalononitrile, 2,3-dihydroxybenzylidenemalononitrile, 2,4-dihydroxybenzylidenemalononitrile, 3,4-dihydroxybenzylidenemalononitrile, 2-carboxybenzylidenemalononitrile, 3-carboxybenzylidenemalononitrile, 4- Carboxybenzylidenemalononitrile, 4-sulfoxybenzylidenemalononitrile, 2-hydroxybenzylidenemalonate dimethyl, 3-hydroxybenzylidenemalonate dimethyl, 4-hydroxybenzylidenemalonate Methyl, dimethyl 2,3-dihydroxybenzylidenemalonate, dimethyl 2,4-dihydroxybenzylidenemalonate, dimethyl 3,4-dihydroxybenzylidenemalonate, dimethyl 2-carboxybenzylidenemalonate, dimethyl 3-carboxybenzylidenemalonate, 4- Dimethyl carboxybenzylidenemalonate, dimethyl 2,3-dicarboxybenzylidenemalonate, dimethyl 4-sulfoxybenzylidenemalonate, diethyl 2-hydroxybenzylidenemalonate, diethyl 3-hydroxybenzylidenemalonate, diethyl 4-hydroxybenzylidenemalonate, 2,3-dihydroxybenzylidene malonate diethyl, 2,4-dihydroxybenzylidene malonate diethyl, 3,4-dihydroxybenzylidene malonate diethyl 2-carboxybenzylidenemalonate diethyl, 3-carboxybenzylidenemalonate diethyl, 4-carboxybenzylidenemalonate diethyl, 4-sulfoxybenzylidenemalonate diethyl, 2-hydroxybenzylidenemalonate dipropyl, 3-hydroxybenzylidenemalonate dipropyl, 4 -Dipropyl benzylidene malonate, dipropyl 2,3-dihydroxybenzylidene malonate, dipropyl 2,4-dihydroxybenzylidene malonate, dipropyl 3,4-dihydroxybenzylidene malonate, dipropyl 2-carboxybenzylidene malonate, 3-carboxybenzylidene malon Dipropyl acid, 4-carboxybenzylidene malonate dipropyl, 4-sulfoxybenzylidene malonate dipropyl, 2-hydroxy Cibenzylidene malonate diisopropyl, 3-hydroxybenzylidene malonate diisopropyl, 4-hydroxybenzylidene malonate diisopropyl, 2,3-dihydroxybenzylidene malonate diisopropyl, 2,4-dihydroxybenzylidene malonate diisopropyl, 3,4-dihydroxybenzylidene malonate Diisopropyl, 2-carboxybenzylidene malonate diisopropyl, 3-carboxybenzylidene malonate diisopropyl, 4-carboxybenzylidene malonate diisopropyl, 4-sulfoxybenzylidene malonate diisopropyl, 2-hydroxybenzylidene malonate dibutyl, 3-hydroxybenzylidene malonate dibutyl 4-hydroxybenzylidene malonate dibutyl 2,3-dihydroxybenzylidene Dibutyl nmalonate, dibutyl 2,4-dihydroxybenzylidenemalonate, dibutyl 3,4-dihydroxybenzylidenemalonate, dibutyl 2-carboxybenzylidenemalonate, dibutyl 3-carboxybenzylidenemalonate, dibutyl 4-carboxybenzylidenemalonate, 4-butyl Sulfoxybenzylidenemalonate dibutyl, 2-hydroxybenzylidenemalonate diisobutyl, 3-hydroxybenzylidenemalonate diisobutyl, 4-hydroxybenzylidenemalonate diisobutyl, 2,3-dihydroxybenzylidenemalonate diisobutyl, 2,4-dihydroxybenzylidenemalonate diisobutyl 3,4-dihydroxybenzylidenemalonate diisobutyl, 2-carboxybenzylidenemalonate diisobutyl, 3-carboxy Diisobutyl benzylidenemalonate, diisobutyl 4-carboxybenzylidenemalonate, diisobutyl 4-sulfoxybenzylidenemalonate, disec-butyl 2-hydroxybenzylidenemalonate, disec-butyl 3-hydroxybenzylidenemalonate, 4-hydroxybenzylidenemalon Disec-butyl acid, disec-butyl 2,3-dihydroxybenzylidenemalonate, disec-butyl 2,4-dihydroxybenzylidenemalonate, disec-butyl 3,4-dihydroxybenzylidenemalonate, 2-carboxybenzylidenemalon Disec-butyl acid, disec-butyl 3-carboxybenzylidenemalonate, disec-butyl 4-carboxybenzylidenemalonate, disec-butyl 4-sulfoxybenzylidenemalonate, 2-tert-butyl 2-hydroxybenzylidene malonate, di-tert-butyl 3-hydroxybenzylidene malonate, di-tert-butyl 4-hydroxybenzylidene malonate, di-tert-butyl 2,3-dihydroxybenzylidene malonate, 2,4- Ditert-butyl dihydroxybenzylidenemalonate, ditert-butyl 3,4-dihydroxybenzylidenemalonate, ditert-butyl 2-carboxybenzylidenemalonate, ditert-butyl 3-carboxybenzylidenemalonate, 4-carboxybenzylidenemalonic acid Ditert-butyl, ditert-butyl 4-sulfoxybenzylidenemalonate, α-cyano-2-hydroxycinnamic acid, α-cyano-3-hydroxycinnamic acid, α-cyano-4-hydroxycinnamic acid, α Cyano-2-carboxycinnamic acid, α-cyano-3-carboxycinnamic acid, α-cyano-4-carboxycinnamic acid, α-cyano-2-sulfoxycinnamic acid, α-cyano-3-sulfoxycinnamic acid Α-cyano-4-sulfoxycinnamic acid, methyl α-cyano-2-hydroxycinnamate, methyl α-cyano-3-hydroxycinnamic acid, methyl α-cyano-4-hydroxycinnamic acid, α-cyano 2-methyl carboxycinnamate, methyl α-cyano-3-carboxycinnamate, methyl α-cyano-4-carboxycinnamate, methyl α-cyano-4-sulfoxycinnamate, α-cyano-2- Ethyl hydroxycinnamate, ethyl α-cyano-3-hydroxycinnamate, ethyl α-cyano-4-hydroxycinnamate, ethyl α-cyano-2-carboxycinnamate, α Ethyl cyano-3-carboxycinnamate, ethyl α-cyano-4-carboxycinnamate, ethyl α-cyano-4-sulfoxycinnamate, propyl α-cyano-2-hydroxycinnamate, α-cyano-3 -Propyl hydroxycinnamate, α-cyano-4-hydroxypropyl cinnamate, α-cyano-2-carboxypropyl cinnamate, α-cyano-3-carboxypropyl cinnamate, α-cyano-4-carboxy Propyl cinnamate, propyl α-cyano-4-sulfoxycinnamate, isopropyl α-cyano-2-hydroxycinnamate, isopropyl α-cyano-3-hydroxycinnamate, α-cyano-4-hydroxycinnamic acid Isopropyl, α-cyano-2-carboxycinnamate, isopropyl α-cyano-3-carboxycinnamate, α-si Isopropyl ano-4-carboxycinnamate, isopropyl α-cyano-4-sulfoxycinnamate, butyl α-cyano-2-hydroxycinnamate, butyl α-cyano-3-hydroxycinnamate, α-cyano-4 -Butyl hydroxycinnamate, butyl α-cyano-2-carboxycinnamate, butyl α-cyano-3-carboxycinnamate, butyl α-cyano-4-carboxycinnamate, α-cyano-4-sulfoxysilicate Butyl cinnamate, isobutyl α-cyano-2-hydroxycinnamate, isobutyl α-cyano-3-hydroxycinnamate, isobutyl α-cyano-4-hydroxycinnamate, α-cyano-2-carboxycinnamic acid Isobutyl, isobutyl α-cyano-3-carboxycinnamate, isobutyl α-cyano-4-carboxycinnamate, α-cyano-4- L-butyl cinnamate, sec-butyl α-cyano-2-hydroxycinnamate, sec-butyl α-cyano-3-hydroxycinnamate, sec-butyl α-cyano-4-hydroxycinnamate, α-cyano -2-carboxycinnamic acid sec-butyl, α-cyano-3-carboxycinnamic acid sec-butyl, α-cyano-4-carboxycinnamic acid sec-butyl, α-cyano-4-sulfoxycinnamic acid sec-butyl Butyl, tert-butyl α-cyano-2-hydroxycinnamate, tert-butyl α-cyano-3-hydroxycinnamate, tert-butyl α-cyano-4-hydroxycinnamate, α-cyano-2- Tert-butyl carboxycinnamate, tert-butyl α-cyano-3-carboxycinnamate, α-cyano-4-carboxycinnamic acid t tert-butyl, α-cyano-4-sulfoxycinnamic acid tert-butyl, α-cyano-2-hydroxycinnamic acid (2-methoxyethyl), α-cyano-3-hydroxycinnamic acid (2-methoxyethyl) , Α-cyano-4-hydroxycinnamic acid (2-methoxyethyl), α-cyano-2-carboxycinnamic acid (2-methoxyethyl), α-cyano-3-carboxycinnamic acid (2-methoxyethyl) ), Α-cyano-4-carboxycinnamic acid (2-methoxyethyl), and α-cyano-4-sulfoxycinnamic acid (2-methoxyethyl) are preferred. 2-hydroxybenzylidenemalononitrile, 3-hydroxybenzylidenemalononitrile 4-hydroxybenzylidenemalononitrile, 2,3-dihydroxybenzylidenemalononitrile, 2,4-dihydride Roxybenzylidenemalononitrile, 3,4-dihydroxybenzylidenemalononitrile, 2-hydroxybenzylidenemalonate dimethyl, 3-hydroxybenzylidenemalonate dimethyl, 4-hydroxybenzylidenemalonate dimethyl, 2,3-dihydroxybenzylidenemalonate dimethyl, 2, 4-Dihydroxybenzylidenemalonate dimethyl, 3,4-dihydroxybenzylidenemalonate dimethyl, 2-hydroxybenzylidenemalonate diethyl, 3-hydroxybenzylidenemalonate diethyl, 4-hydroxybenzylidenemalonate diethyl, 2,3-dihydroxybenzylidenemalonic acid Diethyl, diethyl 2,4-dihydroxybenzylidenemalonate, diethyl 3,4-dihydroxybenzylidenemalonate, 2-hydroxybenzyl Dipropyl denmalonate, dipropyl 3-hydroxybenzylidene malonate, dipropyl 4-hydroxybenzylidene malonate, dipropyl 2,3-dihydroxybenzylidene malonate, dipropyl 2,4-dihydroxybenzylidene malonate, dipropyl 3,4-dihydroxybenzylidene malonate, 2-hydroxybenzylidenemalonate diisopropyl, 3-hydroxybenzylidenemalonate diisopropyl, 4-hydroxybenzylidenemalonate diisopropyl, 2,3-dihydroxybenzylidenemalonate diisopropyl, 2,4-dihydroxybenzylidenemalonate diisopropyl, 3,4-dihydroxybenzylidene Diisopropyl malonate, 2-hydroxybenzylidene malonate dibutyl, 3-hydroxybenzylidene malo Dibutyl 4-hydroxybenzylidene malonate, dibutyl 2,3-dihydroxybenzylidene malonate, dibutyl 2,4-dihydroxybenzylidene malonate, dibutyl 3,4-dihydroxybenzylidene malonate, diisobutyl 2-hydroxybenzylidene malonate, 3 -Diisobutyl hydroxybenzylidenemalonate, diisobutyl 4-hydroxybenzylidenemalonate, diisobutyl 2,3-dihydroxybenzylidenemalonate, diisobutyl 2,4-dihydroxybenzylidenemalonate, diisobutyl 3,4-dihydroxybenzylidenemalonate, 2-hydroxybenzylidenemalonate Disec-butyl acid, disec-butyl 3-hydroxybenzylidenemalonate, disec-butyl 4-hydroxybenzylidenemalonate 2,3-dihydroxybenzylidenemalonate disec-butyl 2,4-dihydroxybenzylidenemalonate disec-butyl, 3,4-dihydroxybenzylidenemalonate disec-butyl, 2-hydroxybenzylidenemalonate ditert-butyl Ditert-butyl 3-hydroxybenzylidenemalonate, ditert-butyl 4-hydroxybenzylidenemalonate, ditert-butyl 2,3-dihydroxybenzylidenemalonate, ditert-butyl 2,4-dihydroxybenzylidenemalonate, 3 , 4-Dihydroxybenzylidenemalonate ditert-butyl, α-cyano-2-hydroxycinnamic acid, α-cyano-3-hydroxycinnamic acid, α-cyano-4-hydroxycinnamic acid, α-cyano-2 -Carboxycinnamic acid, alpha-sia No-3-carboxycinnamic acid, α-cyano-4-carboxycinnamic acid, α-cyano-2-sulfoxycinnamic acid, α-cyano-3-sulfoxycinnamic acid, α-cyano-4-sulfoxycinnamic acid, α-cyano-2-hydroxycinnamate methyl, α-cyano-3-hydroxycinnamate methyl, α-cyano-4-hydroxycinnamate methyl, α-cyano-2-hydroxycinnamate ethyl, α- Ethyl cyano-3-hydroxycinnamate, ethyl α-cyano-4-hydroxycinnamate, propyl α-cyano-2-hydroxycinnamate, propyl α-cyano-3-hydroxycinnamate, α-cyano- Propyl 4-hydroxycinnamate, isopropyl α-cyano-2-hydroxycinnamate, isopropyl α-cyano-3-hydroxycinnamate, α-cyano-4-hydroxy Isopropyl cinnamate, butyl α-cyano-2-hydroxycinnamate, butyl α-cyano-3-hydroxycinnamate, butyl α-cyano-4-hydroxycinnamate, α-cyano-2-hydroxycinnamate Isobutyl acid, isobutyl α-cyano-3-hydroxycinnamate, isobutyl α-cyano-4-hydroxycinnamate, sec-butyl α-cyano-2-hydroxycinnamate, α-cyano-3-hydroxycinnamate Sec-butyl acid, sec-butyl α-cyano-4-hydroxycinnamate, tert-butyl α-cyano-2-hydroxycinnamate, tert-butyl α-cyano-3-hydroxycinnamate, α-cyano Tert-Butyl-4-hydroxycinnamic acid, α-cyano-2-hydroxycinnamic acid (2-methoxyethyl), α-cyano-3-hydroxy Cinnamic acid (2-methoxyethyl), alpha-cyano-4-hydroxycinnamic acid (2-methoxyethyl) is more preferred. By polymerizing these monomers, a polymer can be obtained without post-reaction such as deprotection.

  The polymer may contain other monomer residue units as long as it does not exceed the scope of the present invention. Examples of other monomer residue units include α-methylstyrene residue units. Α-substituted styrene residue units such as: (meth) acrylic acid residue units; (meth) methyl acrylate residue units, (meth) ethyl acrylate residue units, (meth) butyl acrylate residue units, etc. (Meth) acrylic acid ester residue units; acrylonitrile residue units; methacrylonitrile residue units; olefin residue units such as ethylene residue units and propylene residue units; di-n-butyl fumarate residue units; One type or two or more types selected from fumaric acid diester residue units such as bis (2-ethylhexyl) fumarate residue units can be exemplified.

  Since the composition of the polymer of the present invention is more excellent in retardation characteristics when used as an optical compensation film, the monomer residue unit represented by the general formula (1) is 5-55 mol% and The monomer residue unit represented by any one of the general formulas (2) to (4) is preferably 45 to 95 mol%, and the monomer residue unit represented by the general formula (1) is 20 to 50 mol%. And 50 to 80 mol% of the monomer residue unit represented by any of the general formulas (2) to (4) is more preferable, and the monomer residue unit 30 to 45 represented by the general formula (1) The monomer residue units represented by mol% and any one of the general formulas (2) to (4) are particularly preferably 55 to 70 mol%.

  Since the polymer of the present invention is more excellent in heat resistance when used as a film, the glass transition point is preferably 100 ° C or higher, more preferably 120 ° C or higher, and 150 ° C or higher. It is particularly preferred that

  Since the polymer of the present invention is excellent in mechanical properties, strength when used as a film, and toughness, it is converted into standard polystyrene in terms of an elution curve measured by gel permeation chromatography (GPC). The number average molecular weight is preferably 5,000 to 500,000, more preferably 8,000 to 400,000, and particularly preferably 10,000 to 300,000.

  The specific method for producing the polymer of the present invention may be any method as long as the copolymer is obtained. For example, the polymer is produced by radical polymerization of the monomer represented by the general formula (5). can do.

  For the radical polymerization, any known polymerization method, for example, bulk polymerization method, solution polymerization method, suspension polymerization method, precipitation polymerization method or emulsion polymerization method can be employed.

  Examples of the polymerization initiator used for radical polymerization include benzoyl peroxide, lauryl peroxide, octanoyl peroxide, acetyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, and dicumyl peroxide. , Organic peroxides such as t-butylperoxyacetate and t-butylperoxybenzoate; 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2-butyronitrile), 2 Azo initiators such as 1,2′-azobisisobutyronitrile, dimethyl-2,2′-azobisisobutyrate, 1,1′-azobis (cyclohexane-1-carbonitrile), and the like.

  And there is no restriction | limiting in particular as a solvent which can be used in solution polymerization method, suspension polymerization method, precipitation polymerization method, emulsion polymerization method, For example, aromatic solvents, such as benzene, toluene, xylene; Methanol, ethanol, propanol, butanol, etc. And cyclohexane, dioxane, tetrahydrofuran, acetone, methyl ethyl ketone, dimethylformamide, isopropyl acetate, water, and the like, and mixed solvents thereof.

  Moreover, the polymerization temperature at the time of performing radical polymerization can be suitably set according to the decomposition temperature of a polymerization initiator, and generally it is preferable to carry out in the range of 30-150 degreeC.

  The polymer of the present invention can be used as an optical film.

  When the polymer of the present invention is used as an optical film, the image quality is improved, so that the haze is preferably 2% or less, and more preferably 1% or less.

  When the polymer of the present invention is used as an optical film, it is preferable that the total light transmittance is 85% or more because the characteristics of image quality are improved.

  When the polymer of the present invention is used as an optical film, it is preferable to use an optical compensation film (retardation film) because it has excellent retardation characteristics.

  Since the optical compensation film using the polymer of the present invention exhibits a retardation even when unstretched, the refractive index in the fast axis direction in the film plane is nx, and the refractive index in the film in-plane direction perpendicular thereto is ny. The film is used as an optical compensation film in which the relationship when the refractive index in the thickness direction of the film is nz is nx≈ny <nz.

  As an optical compensation film using the polymer of the present invention, not only the polymer can be used, but also a composition mixed with another polymer is suitable. At this time, the other polymer to be mixed may be a polymer having negative birefringence or a polymer having positive birefringence.

  When the polymer of the present invention is used as an optical compensation film having negative birefringence, it is possible to reduce the thickness of the film. Therefore, the ratio between the out-of-plane retardation (Rth) represented by the following formula (A) and the thickness ( Rth / film thickness) is preferably 6 or more (nm / μm) in absolute value, more preferably 8 or more, and particularly preferably 9 or more.

Rth = [(nx + ny) / 2−nz] × d (A)
(Where nx represents the refractive index in the fast axis direction in the film plane, ny represents the refractive index in the slow axis direction in the film plane, nz represents the refractive index outside the film plane, and d represents the film. Indicates thickness.)
In the present invention, when the polymer is used as an optical compensation film having negative birefringence, it is preferable that nx <nz or ny <nz because the three-dimensional refractive index can be controlled independently.

  There is no restriction | limiting in particular as an optical film manufacturing method using the copolymer of this invention, For example, it can manufacture by methods, such as a solution cast method and a melt cast method.

  The solution casting method is a method in which a solution obtained by dissolving the polymer in a solvent (hereinafter referred to as a dope) is cast on a support substrate, and then the solvent is removed by heating or the like to obtain a film. In this case, as a method for casting the dope on the support substrate, for example, a T-die method, a doctor blade method, a bar coater method, a roll coater method, a lip coater method, or the like is used. Particularly, industrially, a method of continuously extruding a dope from a die onto a belt-like or drum-like support substrate is common. Examples of the support substrate used include a glass substrate, a metal substrate such as stainless steel and ferrotype, and a film such as polyethylene terephthalate. In the solution casting method, when forming a film having high transparency and excellent thickness accuracy and surface smoothness, the solution viscosity of the dope is an extremely important factor, preferably 10 to 20000 cPs, More preferably, it is -10000 cPs.

  In this case, the coating thickness of the film using the polymer is preferably 1 to 200 μm after drying, more preferably 5 to 100 μm, and particularly preferably 10 because excellent surface smoothness and optical properties can be obtained. ~ 50 μm.

  The melt casting method is a molding method in which the polymer is melted in an extruder, extruded from a slit of a T-die into a film shape, and then pulled while being cooled with a roll or air.

  The optical compensation film using the polymer of the present invention can be peeled off from the base glass substrate and other optical films and used as a laminate with the base glass substrate and other optical films. Can be used.

  The optical compensation film using the polymer of the present invention can be used after being stretched.

  The optical compensation film using the polymer of the present invention can be laminated with a polarizing plate to be used as a circular or elliptical polarizing plate, and laminated with a polarizer containing polyvinyl alcohol / iodine to form a polarizing plate. Is also possible. Furthermore, it can also laminate | stack with this optical compensation film or another optical compensation film.

  In the optical compensation film using the polymer of the present invention, an antioxidant is preferably blended in order to increase the thermal stability of the film forming or the retardation film itself. Examples of the antioxidant include hindered phenolic antioxidants, phosphorus antioxidants, and other antioxidants, and these antioxidants may be used alone or in combination. And since an antioxidant action improves synergistically, it is preferable to use a hindered antioxidant and a phosphorus antioxidant in combination, and in that case, with respect to 100 parts by weight of the hindered antioxidant More preferably, the phosphorus-based antioxidant is used in a mixture of 100 to 500 parts by weight. Further, the addition amount of the antioxidant is preferably 0.01 to 10 parts by weight with respect to 100 parts by weight of the polymer constituting the retardation film, since a high antioxidant effect is obtained. More preferred is ˜1 part by weight.

  Further, as the ultraviolet absorber, for example, benzotriazole, benzophenone, triazine, benzoate and the like may be blended as necessary.

  The optical film using the polymer of the present invention may contain other polymers, surfactants, polymer electrolytes, conductive complexes, inorganic fillers, pigments, antistatic agents, antiblocking agents, lubricants, and the like. .

  According to the present invention, optical properties such as a contrast film and a viewing angle characteristic compensation film and an antireflection film of a liquid crystal display having a large refractive index in the thickness direction, a large in-plane retardation, and a small wavelength dependency. It is possible to provide a polymer suitable for an optical compensation film excellent in.

  The polymer of the present invention is a polymer suitable for an optical compensation film having excellent retardation characteristics and compatibility, and particularly suitable for an optical compensation film for a liquid crystal display element and an organic EL.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples.

  In addition, the various physical properties shown by an Example were measured with the following method.

<Polymer composition>
Using a nuclear magnetic resonance measuring apparatus (manufactured by JEOL, trade name JNM-ECZ400S), it was determined by proton nuclear magnetic resonance spectroscopy ( ¹ H-NMR) spectrum analysis. Moreover, what was difficult to obtain | require by < ¹ > H-NMR spectrum analysis was calculated | required by CHN elemental analysis.

<Measurement of number average molecular weight>
Using a gel permeation chromatography (GPC) apparatus (trade name HLC-8320GPC (equipped with column GMH _HR -H) manufactured by Tosoh Corporation), measured at 40 ° C. using tetrahydrofuran or N, N-dimethylformamide as a solvent. And obtained as standard polystyrene or pullulan conversion value.

<Measurement of three-dimensional refractive index of film>
Measurement was performed using a fully automatic birefringence meter (trade name KOBRA-WPR, manufactured by Oji Scientific Instruments).

Example 1
In a glass ampoule having a capacity of 50 ml, 5.0 g of ethyl α-cyano-4-hydroxycinnamate, 4.4 g of N-vinylcarbazole, 8.5 g of tetrahydrofuran as a polymerization solvent, and 2,5-dimethyl-2, which is a polymerization initiator, 5-Di (2-ethylhexanoylperoxy) hexane (0.17 g) was added, and the atmosphere was replaced with nitrogen, followed by sealing under reduced pressure. The glass ampule was placed in a constant temperature bath at 62 ° C. and kept for 48 hours to carry out radical polymerization. After the completion of the polymerization reaction, the polymer was taken out of the container, dropped into 500 ml of methanol and precipitated, and then vacuum-dried at 80 ° C. for 10 hours, whereby ethyl α-cyano-4-hydroxycinnamate-N -7.7 g of vinyl carbazole copolymer was obtained. (Yield 82%)
The number-average molecular weight of the resulting α-cyano-4-hydroxycinnamic acid ethyl-N-vinylcarbazole copolymer is 22,000, and the copolymer composition is ethyl α-cyano-4-hydroxycinnamic acid residue units. It was confirmed that / N-vinylcarbazole residue unit = 42/58 (mol%).

  By dissolving the obtained α-cyano-4-hydroxycinnamic acid ethyl N-vinylcarbazole copolymer in tetrahydrofuran, coating the solution on a glass substrate with a spin coater, and vacuum drying at 60 ° C. for 10 hours. A good film (film thickness 15.2 μm) having a haze of 0.4% and a total light transmittance of 87% was obtained. When the three-dimensional refractive index of the obtained film was measured, nx = 1.661, ny = 1.661, nz = 1.704, and Rth / film thickness = −23.0 (nm / μm). And expressed a high negative phase difference.

  0.5 g of the obtained α-cyano-4-hydroxycinnamate-N-vinylcarbazole copolymer and 0.5 g of polymethyl methacrylate (manufactured by Tokyo Chemical Industry, number average molecular weight 270000) were dissolved in 10 g of tetrahydrofuran, The solution is coated on a glass substrate with a spin coater and vacuum dried at 60 ° C. for 10 hours to obtain a good film having a haze of 0.7%. Therefore, ethyl α-cyano-4-hydroxycinnamate-N— The vinyl carbazole copolymer was a polymer having excellent compatibility.

Example 2
In a glass ampoule having a capacity of 50 ml, 5.0 g of 4-hydroxybenzalmalononitrile, 4.5 g of 2-vinylnaphthalene, 10 g of tetrahydrofuran as a polymerization solvent and 2,5-dimethyl-2,5-di (2- Ethylhexanoylperoxy) hexane (0.21 g) was added, purged with nitrogen, and then sealed under reduced pressure. The glass ampule was placed in a constant temperature bath at 62 ° C. and kept for 48 hours to carry out radical polymerization. After completion of the polymerization reaction, the polymer is taken out of the container, dropped into 500 ml of methanol and precipitated, and then vacuum-dried at 80 ° C. for 10 hours to give 4-hydroxybenzalmalononitrile-2-vinylnaphthalene. 6.2 g of polymer was obtained. (Yield 65%)
The number average molecular weight of the obtained 4-hydroxybenzalmalononitrile-2-vinylnaphthalene copolymer is 12000, and the copolymer composition is 4-hydroxybenzalmalononitrile residue unit / 2-vinylnaphthalene residue unit. = 43/57 (mol%).

  0.5 g of the obtained 4-hydroxybenzalmalononitrile-2-vinylnaphthalene copolymer and 0.5 g of polyethylene glycol (manufactured by Tokyo Chemical Industry, number average molecular weight 3000) are dissolved in 4 g of tetrahydrofuran, and the solution is placed on a glass substrate. A good film (film thickness 12.4 μm) having a haze of 0.4% and a total light transmittance of 86% was obtained by spin coating and vacuum drying at 60 ° C. for 10 hours. When the three-dimensional refractive index of the obtained film was measured, nx = 1.634, ny = 1.633, nz = 1.668, and Rth / film thickness = −34.3 (nm / μm). And expressed a high negative phase difference.

  0.8 g of the obtained 4-hydroxybenzalmalononitrile-2-vinylnaphthalene copolymer and 0.2 g of polymethyl methacrylate (manufactured by Tokyo Chemical Industry, number average molecular weight 270000) are dissolved in 9 g of cyclohexanone, and the solution is glass substrate. A 4-hydroxybenzalmalononitrile-2-vinylnaphthalene copolymer is compatible because it is coated with a spin coater and vacuum dried at 100 ° C. for 10 hours to form a good film with a haze of 0.8%. It was an excellent polymer.

Example 3
In a glass ampoule having a capacity of 50 ml, 5.3 g of 4-carboxybenzalmalononitrile, 4.7 g of N-vinylphthalimide, 12.5 g of N, N-dimethylformamide as a polymerization solvent and 2,5-dimethyl-2 which is a polymerization initiator , 5-Di (2-ethylhexanoylperoxy) hexane (0.19 g) was added, and after purging with nitrogen, it was sealed under reduced pressure. The glass ampule was placed in a constant temperature bath at 62 ° C. and kept for 48 hours to carry out radical polymerization. After completion of the polymerization reaction, the polymer was taken out of the container, dropped into 200 ml of methanol and precipitated, and then vacuum-dried at 80 ° C. for 10 hours, whereby 4-carboxybenzalmalononitrile-N-vinylphthalimide co-polymerized. 4.5 g of polymer was obtained. (Yield 45%)
The number average molecular weight of the obtained 4-carboxybenzalmalononitrile-N-vinylphthalimide copolymer is 13,000, and the copolymer composition is 4-carboxybenzalmalononitrile residue unit / N-vinylphthalimide copolymer. It was confirmed that the residue unit = 35/65 (mol%).

  The obtained 4-carboxybenzalmalononitrile-N-vinylphthalimide copolymer was dissolved in N, N-dimethylformamide, the solution was spin-coated on a glass substrate, and vacuum-dried at 60 ° C. for 180 minutes for haze. A good film (film thickness: 13.0 μm) having 0.5% and a total light transmittance of 87% was obtained. When the three-dimensional refractive index of the obtained film was measured, nx = 1.626, ny = 1.626, nz = 1.647, and Rth / film thickness = -21.1 (nm / μm). And expressed a high negative phase difference.

  0.7 g of the obtained 4-carboxybenzalmalononitrile-N-vinylphthalimide copolymer and 0.3 g of polyvinyl acetate (manufactured by Aldrich, number average molecular weight 53000) were dissolved in 4 g of N, N-dimethylformamide to obtain a solution. Is coated on a glass substrate with a spin coater and vacuum dried at 60 ° C. for 10 hours to form a good film with a haze of 0.8%. Therefore, 4-carboxybenzalmalononitrile-N-vinylphthalimide copolymer Was a polymer with excellent compatibility.

Example 4
In a glass ampule having a capacity of 50 ml, 6.1 g of N, N-dimethyl-4-sulfoxy-α-cyanocinnamide, 8.9 g of 2-vinylnaphthalene, 10.0 g of N, N-dimethylformamide as a polymerization solvent and a polymerization initiator A certain amount of 2,8-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane (0.28 g) was added, purged with nitrogen, and sealed under reduced pressure. The glass ampule was placed in a constant temperature bath at 62 ° C. and kept for 48 hours to carry out radical polymerization. After completion of the polymerization reaction, the polymer was taken out of the container, dropped into 200 ml of methanol and precipitated, and then vacuum-dried at 80 ° C. for 10 hours to obtain N, N-dimethyl-4-sulfoxy-α-cyanosilicate. 3.3 g of peeled amide-2-vinylnaphthalene copolymer was obtained. (Yield 33%)
The number average molecular weight of the obtained N, N-dimethyl-4-sulfoxy-α-cyanocinnamic amide-2-vinylnaphthalene copolymer is 10,000, and the copolymer composition is N, N-dimethyl-4-sulfoxy- It was confirmed that α-cyanocinnamic amide residue unit / 2-vinylnaphthalene copolymer residue unit = 29/71 (mol%).

  The obtained N, N-dimethyl-4-sulfoxy-α-cyanocinnamide-2-vinylnaphthalene copolymer was dissolved in N, N-dimethylformamide, and the solution was spin coated on a glass substrate at 60 ° C. A good film (film thickness: 9.7 μm) having a haze of 0.5% and a total light transmittance of 86% was obtained by vacuum drying for 10 hours. When the three-dimensional refractive index of the obtained film was measured, nx = 1.633, ny = 1.634, nz = 1.652, and Rth / film thickness = 1−18.5 (nm / μm). And expressed a high negative phase difference.

  0.8 g of the obtained N, N-dimethyl-4-sulfoxy-α-cyanocinnamic amide-2-vinylnaphthalene copolymer and 0.3 g of ethyl cellulose (Etocel Standard 100 manufactured by Dow Chemical, number average molecular weight 55000) were used. Dissolve in 9 g of tetrahydrofuran, coat the solution on a glass substrate with a spin coater, and vacuum dry at 60 ° C. for 10 hours to obtain a good film with a haze of 0.9%. Therefore, N, N-dimethyl-4- The sulfoxy-α-cyanocinnamic amide-2-vinylnaphthalene copolymer was a polymer having excellent compatibility.

Comparative Example 1
0.5 g of poly (N-vinylcarbazole) (manufactured by Aldrich, number average molecular weight 35000) and 0.5 g of polymethyl methacrylate (manufactured by Tokyo Chemical Industry, number average molecular weight 270000) are dissolved in 10 g of tetrahydrofuran, and the solution is placed on a glass substrate. Coat with a spin coater and vacuum dry at 60 ° C. for 10 hours, resulting in a poor film of 86.6% haze, so poly (N-vinylcarbazole) was a polymer with poor compatibility.

Comparative Example 2
0.8 g of poly (2-vinylnaphthalene) (manufactured by Aldrich, number average molecular weight 50000) and 0.2 g of polymethyl methacrylate (manufactured by Tokyo Chemical Industry, number average molecular weight 270000) are dissolved in 9 g of cyclohexanone, and the solution is placed on a glass substrate. Coat with a spin coater and vacuum dry at 100 ° C. for 10 hours to form a defective film with a haze of 90.3%. Therefore, poly (2-vinylnaphthalene) was a poorly compatible polymer.

Comparative Example 3
A glass ampoule having a capacity of 50 ml, 2.8 g of methacrylonitrile, 7.2 g of N-vinylphthalimide, 12.5 g of N, N-dimethylformamide as a polymerization solvent, and 2,5-dimethyl-2,5-di, which is a polymerization initiator (2-Ethylhexanoylperoxy) hexane (0.30 g) was added, purged with nitrogen, and then sealed under reduced pressure. The glass ampoule was placed in a constant temperature bath at 62 ° C. and kept for 18 hours to carry out radical polymerization. After completion of the polymerization reaction, the polymer is taken out of the container, dropped into 200 ml of methanol and precipitated, and then vacuum-dried at 80 ° C. for 10 hours to obtain a methacrylonitrile-N-vinylphthalimide copolymer. 8 g was obtained. (Yield 78%)
It was confirmed that the obtained methacrylonitrile-N-vinylphthalimide copolymer had a number average molecular weight of 21,000.

  0.7 g of the obtained methacrylonitrile-N-vinylphthalimide copolymer and 0.3 g of polyvinyl acetate (manufactured by Aldrich, number average molecular weight 53000) are dissolved in 4 g of N, N-dimethylformamide, and the solution is placed on a glass substrate. A methacrylonitrile-N-vinylphthalimide copolymer is a poorly compatible polymer because a film having a haze of 92.1% is obtained by coating with a spin coater and vacuum drying at 60 ° C. for 10 hours. It was.

  The present invention provides a novel polymer, and the polymer is expected to be used as a film, particularly as an optical compensation film.

Claims (8)

The polymer characterized by including the monomer residue unit represented by General formula (1).

(Here, R ₁ and R ₂ are each independently hydrogen (except when R ₁ and R ₂ are both hydrogen), halogen, a linear alkyl group having 1 to 12 carbon atoms, and 1 carbon atom. 12 branched alkyl group, a cyclic group of 3 to 14 carbon atoms, a cyano group, a carboxyl group, an ester group (-C (= O) OX ₁ or _{-CO (= O) -X 2)} , an alkoxy group (- OX ₃ ) or an amide group (—C (═O) N (X ₄ ) (X ₅ ) or —NX ₆ C (═O) X ₇ ) (where X _{1 to} X ₃ are each independently carbon A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{4 to} X ₇ are each independently hydrogen, carbon number 1 -12 linear alkyl group, branched alkyl group having 1 to 12 carbon atoms, or ring having 3 to 14 carbon atoms R ₃ represents hydrogen or halogen, and R _{4 to} R ₈ are each a hydrogen atom or a halogen atom, which may contain a hetero atom in the linear or branched alkyl group or the cyclic group. Hydrogen, halogen, linear alkyl group having 1 to 12 carbon atoms, branched alkyl group having 1 to 12 carbon atoms, cyclic group having 3 to 14 carbon atoms, hydroxy group, carboxy group, sulfoxy group, nitro Group, cyano group, thiol group, ester group (—C (═O) OX ₈ or —CO (═O) —X ₉ ), alkoxy group (—OX ₁₀ ), amide group (—C (═O) N ( _{X 11) (X 12)} or _{-NX 13 C (= O) X} 14), an acyl group _{(-C (= O) X 15} ), an amino group _{(-N (X 16) (X} 17)) or a sulfonyl group (-SOOX ₁₈ ) (where X _{8 to} X ₁₀ are Each independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{11 to} X ₁₈ are each independently Hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms), and at least R _{4 to} R ₈ 1 or more represents one or more selected from a hydroxy group, a carboxy group, and a sulfoxy group, and R _{4 to} R ₈ may form a condensed ring structure with adjacent substituents. At least one or more of R ₁ and R ₂ in the monomer residue unit represented by the general formula (1) is one or more selected from a cyano group, an ester group, an amide group, and an acyl group. The polymer according to claim 1. The polymer according to claim 1 or 2, wherein any one or more of R _{4 to} R ₈ in the monomer residue unit represented by the general formula (1) is a hydroxy group. Including a monomer residue unit represented by the general formula (1), and further comprising at least one monomer residue unit represented by the general formula (2) to the general formula (4) The polymer according to any one of claims 1 to 3.

(Here, R _{9 to} R ₁₁ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, Carboxy group, ester group (—C (═O) OX ₁₉ or —CO (═O) —X ₂₀ ), amide group (—C (═O) N (X ₂₁ ) (X ₂₂ ) or —NX ₂₃ C ( ═O) X ₂₄ ) or an acyl group (—C (═O) X ₂₅ ) (wherein X _{19 to} X ₂₀ are each independently a linear alkyl group having 1 to 12 carbon atoms, 12 represents a branched alkyl group or a cyclic group having 3 to 14 carbon atoms, and X _{21 to} X ₂₅ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, or 1 to 12 carbon atoms. branched alkyl group or an cyclic group having a carbon number of 3 to 14,.) _{indicates, R 12} ~ ₁₆ are each independently hydrogen, halogen, straight-chain alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, cyclic group of 3 to 14 carbon atoms, a cyano group, a nitro group, hydroxy group , Carboxyl group, thiol group, alkoxy group (—OX ₂₆ ), ester group (—C (═O) OX ₂₇ or —CO (═O) —X ₂₈ ), amide group (—C (═O) N (X _{29) (X 30)} or _{-NX 31 C (= O) X} 32), an acyl group _{(-C (= O) X 33} ) or an amino group _{(-N (X 34) (X} 35)) ( where, X _{26 to} X ₂₈ each independently represent a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{29 to} X _{28 35} are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms. A kill group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.) R _{12 to} R ₁₆ form a condensed ring structure with adjacent substituents. May be.)

(Here, R _{17 to} R ₁₉ are each independently hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, Carboxy group, ester group (—C (═O) OX ₃₆ or —CO (═O) —X ₃₇ ), amide group (—C (═O) N (X ₃₈ ) (X ₃₉ ) or —NX ₄₀ C ( ═O) X ₄₁ ) or an acyl group (—C (═O) X ₄₂ ) (wherein X _{36 to} X ₃₇ are linear alkyl groups having 1 to 12 carbon atoms, branched alkyl having 1 to 12 carbon atoms) Group or a cyclic group having 3 to 14 carbon atoms, X _{38 to} X ₄₂ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, Or a cyclic group having 3 to 14 carbon atoms), and R _{20 to} R ₂₇ are respectively Independently hydrogen, halogen, linear alkyl group having 1 to 12 carbon atoms, branched alkyl group having 1 to 12 carbon atoms, cyclic group having 3 to 14 carbon atoms, cyano group, nitro group, hydroxy group, carboxy group , Thiol group, alkoxy group (—OX ₄₃ ), ester group (—C (═O) OX ₄₄ or —CO (═O) —X ₄₅ ), amide group (—C (═O) N (X ₄₆ ) ( X ₄₇ ) or —NX ₄₈ C (═O) X ₄₉ ), acyl group (—C (═O) X ₅₀ ) or amino group (—N (X ₅₁ ) (X ₅₂ )) (where X ₄₃ to X ₄₅ each independently represents a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{46 to} X ₅₂ are Each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, 1 carbon atom 12 branched alkyl group, or an indicating.) A cyclic group having a carbon number of 3 to 14. _Further, R 20 _{to R 27} may form a fused ring structure with adjacent _{substituents, R 20} And R ₂₆ and R ₂₁ and R ₂₇ may form a ring structure with the same atom.)

(Here, R _{28 to} R ₃₀ are each independently hydrogen, halogen, a linear hydrocarbon group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms. , Ether group (—OX ₅₃ ), ester group (—C (═O) OX ₅₄ or —CO (═O) —X ₅₅ ), amide group (—C (═O) N (X ₅₆ ) (X ₅₇ ) or _{-NX 58 C (= O) X} 59), including acyl groups _{(-C (= O) X 60} ) or an amino group _{(-N (X 61) (X} 62)), or at least a carbon atom and a nitrogen atom A 5- to 7-membered cyclic group (wherein X _{53 to} X ₅₅ are each independently a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or carbon; Represents a cyclic group of formulas 3 to 14, and X _{56 to} X ₆₂ each independently represent hydrogen, charcoal A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.) R _{31 to} R ₃₄ are each independently hydrogen, halogen, A linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, a cyclic group having 3 to 14 carbon atoms, a cyano group, a nitro group, a hydroxy group, a carboxy group, a thiol group, an alkoxy group ( -OX _63), ester group (-C (= O) _{OX 64} or _{-CO (= O) -X 65)} , amide group _{(-C (= O) N (} X 66) (X 67) or _{-NX 68} C (═O) X ₆₉ ), acyl group (—C (═O) X ₇₀ ) or amino group (—N (X ₇₁ ) (X ₇₂ )) (where X _{63 to} X ₆₅ are each independently Straight chain alkyl group having 1 to 12 carbon atoms, branched chain having 1 to 12 carbon atoms An alkyl group or a cyclic group having 3 to 14 carbon atoms, wherein X _{66 to} X ₇₂ are each independently hydrogen, a linear alkyl group having 1 to 12 carbon atoms, or a branched alkyl group having 1 to 12 carbon atoms; Or a cyclic group having 3 to 14 carbon atoms.) R _{31 to} R ₃₄ may form a condensed ring structure with adjacent substituents, and R ₃₁ , R ₃₂ and R ₃₃ R ₃₄ may form a ring structure with the same atom.) 5 to 55 mol% of monomer residue units represented by the general formula (1) and 95 to 45 mol% of monomer residue units represented by any one of the general formulas (2) to (4) The polymer according to any one of claims 1 to 4, wherein the polymer is contained. The method for producing a polymer according to claim 1, wherein the monomer represented by the general formula (5) is polymerized.

(Here, R ₁ and R ₂ are hydrogen (except when R ₁ and R ₂ are both hydrogen), halogen, a linear alkyl group having 1 to 12 carbon atoms, and a branch having 1 to 12 carbon atoms. Alkyl group, cyclic group having 3 to 14 carbon atoms, cyano group, carboxy group, ester group (—C (═O) OX ₁ or —CO (═O) —X ₂ ), alkoxy group (—OX ₃ ) or Amide group (—C (═O) N (X ₄ ) (X ₅ ) or —NX ₆ C (═O) X ₇ ) (wherein X _{1 to} X ₃ each independently represents 1 to 12 carbon atoms) A linear alkyl group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms, and X _{4 to} X ₇ are each independently hydrogen, a straight chain having 1 to 12 carbon atoms. A chain alkyl group, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms). R ₃ represents hydrogen or halogen, R _{4 to} R ₈ represent hydrogen, halogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or 3 to 14 carbon atoms. Cyclic group, hydroxy group, carboxy group, sulfoxy group, nitro group, cyano group, thiol group, ester group (—C (═O) OX ₈ or —CO (═O) —X ₉ ), alkoxy group (—OX ₁₀ ), An amide group (—C (═O) N (X ₁₁ ) (X ₁₂ ) or —NX ₁₃ C (═O) X ₁₄ ), an acyl group (—C (═O) X ₁₅ ), an amino group (— N (X ₁₆ ) (X ₁₇ )) or a sulfonyl group (—SOOX ₁₈ ) (where X _{8 to} X ₁₀ are each independently a linear alkyl group having 1 to 12 carbon atoms, or 1 to 12 carbon atoms). A branched alkyl group or a cyclic group having 3 to 14 carbon atoms X _{11 to} X ₁₈ each independently represent hydrogen, a linear alkyl group having 1 to 12 carbon atoms, a branched alkyl group having 1 to 12 carbon atoms, or a cyclic group having 3 to 14 carbon atoms.) And at least one of R _{4 to} R ₈ represents one or more selected from a hydroxy group, a carboxy group, and a sulfoxy group, and R _{4 to} R ₈ form a condensed ring structure with adjacent substituents. May be.) An optical film comprising the polymer according to any one of claims 1 to 5. The relationship when the refractive index in the fast axis direction in the film plane is nx, the refractive index in the film in-plane direction orthogonal thereto is ny, and the refractive index in the thickness direction of the film is nz is nx <nz or ny < The retardation film using the optical film according to claim 7, wherein the retardation film is at least one of nz.