CN106604973B

CN106604973B - Composition for forming cured film, alignment material, and phase difference material

Info

Publication number: CN106604973B
Application number: CN201580046083.0A
Authority: CN
Inventors: 伊藤润; 畑中真; 大村浩之; 汤川升志郎; 菅野裕太
Original assignee: Nissan Chemical Corp
Current assignee: Nissan Chemical Corp
Priority date: 2014-08-28
Filing date: 2015-08-27
Publication date: 2020-04-17
Anticipated expiration: 2035-08-27
Also published as: JP6706010B2; TWI724860B; TW202030263A; WO2016031917A1; TWI723961B; CN111240102B; TW201620998A; KR20170046647A; KR102481772B1; CN106604973A; JPWO2016031917A1; CN111240102A

Abstract

The present invention addresses the problem of providing a composition for forming a cured film, which is used to provide an alignment material that has excellent vertical alignment properties and adhesion and can vertically align a polymerizable liquid crystal with high sensitivity even on a resin film, and a retardation material using such an alignment material. The solving means is as follows: a cured film-forming composition characterized by containing (A) a polymer having a vertically-aligned group and a functional group capable of thermal crosslinking, (B) a crosslinking agent, and either or both of (C) an adhesion promoter and (D) a polymer having a thermally crosslinkable group; an alignment material obtained by using the composition; a phase difference material obtained by using the composition.

Description

Composition for forming cured film, alignment material, and phase difference material

Technical Field

The present invention relates to a composition for forming a cured film of a vertical alignment material suitable for vertically aligning liquid crystal molecules, and more particularly, to a composition for forming a cured film useful for producing a + C plate (positive C plate), an alignment material, and a retardation material, which are used for improving the viewing angle characteristics of a Liquid Crystal Display (LCD), more specifically, an IPS liquid crystal display (In-plane switching LCD) filled with a liquid crystal having positive dielectric anisotropy (△ ε > 0).

Background

IPS-LCDs are characterized in that since no inclination of the liquid crystal molecules in the vertical direction occurs, there is little change in luminance/color change due to the viewing angle; however, the weak points include difficulty in improving contrast ratio, luminance, and response speed. For example, as disclosed in patent document 1, with respect to the IPS-LCD of the initial proposal, a compensation film of a viewing angle is not used, and with respect to such an IPS-LCD not using a compensation film of a viewing angle, there is a disadvantage of exhibiting a value of a low contrast ratio due to relatively large light leakage in a dark state at an oblique angle.

Patent document 2 discloses an IPS-LCD compensation film using a + C plate and a + a plate (positive a plate). In this document, the following configuration is shown for the liquid crystal display element described therein.

1) A liquid crystal layer having a horizontal orientation is sandwiched between two substrates supplied with electrodes capable of applying an electric field parallel to the liquid crystal layer surface.

2) More than one + A plate and + C plate are sandwiched by two polarizing plates.

3) The main optical axis of the + A plate is perpendicular to the main optical axis of the liquid crystal layer.

4) The phase difference value R of the liquid crystal layer is determined in such a manner as to satisfy the following equation_LCPhase difference value R of + C plate_+CPhase difference value R of + A board_+A。

R_LC：R_+C：R_+A≈1：0.5：0.25

5) The relationship (TAC, COP, PNB) of the phase difference value in the thickness direction of the protective film of the polarizing plate with respect to the phase difference values of the + a plate and the + C plate is not shown.

Further, an IPS-LCD having a + a plate and a + C plate is disclosed, and an object thereof is to provide an IPS-LCD having high contrast characteristics and low Color Shift (Color Shift) at the front and tilt angles by minimizing light leakage in a dark state at the tilt angle (patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2-256023

Patent document 2: japanese laid-open patent publication No. 11-133408

Patent document 3: japanese laid-open patent publication No. 2009-122715

Patent document 4: japanese patent laid-open publication No. 2001-281669

Disclosure of Invention

Problems to be solved by the invention

As proposed in the related art, the + C plate is useful as an optical compensation film for IPS-LCD since it can compensate for light leakage when the viewing angle of the polarizing plate is large. However, it is difficult to impart vertical alignment (positive C-plate) properties by a conventionally generally known method based on stretching treatment.

In addition, in the vertical alignment film using polyimide which has been proposed in the past, it is necessary to use a solvent for polyimide such as N-methyl-2-pyrrolidone in the production of the film. Therefore, although there is no problem with the glass substrate, when the substrate is a film, there is a problem that the substrate is damaged when the alignment film is formed. Furthermore, a vertical alignment film using polyimide requires firing at a high temperature, and the film base cannot withstand high temperatures.

Further, a method of forming a vertical alignment film by directly treating a substrate with a silane coupling agent having a long chain alkyl group or the like has been proposed, but in the case where no hydroxyl group is present on the surface of the substrate, it is difficult to treat the substrate, and there is a problem that the substrate is limited (patent document 4).

In addition, when a patterned retardation material for a 3D display is manufactured by using a photo-alignment technique, it has been conventionally formed on a glass substrate. However, in recent years, in response to a demand for reduction in production cost, production by a so-called roll-to-roll method has been demanded for inexpensive resin films such as TAC (triacetylcellulose) films and COP (cycloolefin polymer) films.

However, the photo-alignment film formed of the above-described conventional material has poor adhesion to the resin film, and it is difficult to produce a highly reliable patterned retardation material on the resin film.

Therefore, an alignment material which can form a retardation material having excellent adhesion and high reliability even on a resin film such as a TAC film and which can be applied to a photo-alignment technique, and a composition for forming a cured film for forming such an alignment material are required.

The present invention has been made based on the above findings and findings, and an object of the present invention is to provide a composition for forming a cured film, which is used for providing an alignment material having excellent vertical alignment properties and also having transparency and solvent resistance required for an optical compensation film, and which can stably vertically align a polymerizable liquid crystal under low-temperature short-time firing conditions even on a resin film.

Another object of the present invention is to provide an alignment material obtained from the above-mentioned composition for forming a cured film, having excellent vertical alignment properties and solvent resistance, and capable of stably vertically aligning a polymerizable liquid crystal under low-temperature short-time firing conditions even on a resin film, and a retardation material useful for a + C plate, which is formed using the alignment material.

Other objects and advantages of the present invention will be apparent from the following description.

Means for solving the problems

The present inventors have made intensive studies to achieve the above object, and as a result, have found that a cured film having excellent vertical alignment properties can be formed regardless of the type of a substrate by selecting a material for forming a cured film based on an acrylic copolymer having a long-chain alkyl group in a side chain, and have completed the present invention.

That is, the present invention relates to, as a first aspect, a composition for forming a cured film, characterized in that,

comprises the following components:

(A) a polymer having a vertically-aligned group and a functional group capable of thermal crosslinking,

(B) a crosslinking agent, and

(C) either or both of (D) a polymer having a thermally crosslinkable group and (D) an adhesion promoter,

the vertically-aligning group is a group represented by the following formula [1 ].

(in the formula [1],

the number of the connection positions is indicated,

Y¹represents a single bond or a linking group,

Y²represents a single bond, an alkylene group having 1 to 15 carbon atoms or-CH₂-CH(OH)-CH₂Or a 2-valent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocycle, wherein any hydrogen atom in the cyclic group may be substituted by an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, a fluoroalkoxy group having 1 to 3 carbon atoms or a fluorine atom,

Y³represents a single bond or an alkylene group having 1 to 15 carbon atoms,

Y⁴a single bond, or a 2-valent cyclic group selected from a benzene ring, a cyclohexane ring or a heterocycle, or a 2-valent organic group having 17 to 30 carbon atoms and having a steroid skeleton, wherein any hydrogen atom in the cyclic group may be substituted by an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, or a C2-valent organic group having a carbon atom skeletonA fluorinated alkoxy group having 1 to 3 carbon atoms or a fluorine atom,

Y⁵represents a 2-valent cyclic group selected from a benzene ring, a cyclohexane ring or a heterocycle, any hydrogen atom on the cyclic group may be substituted by an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, a fluoroalkoxy group having 1 to 3 carbon atoms or a fluorine atom,

n represents an integer of 0 to 4, and when n is 2 or more, Y⁵May be the same as or different from each other,

Y⁶represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a fluoroalkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms or a fluoroalkoxy group having 1 to 18 carbon atoms,

as Y²And Y³And as substituents on the cyclic group or Y⁶The alkyl group, the fluoroalkyl group, the alkoxy group and the fluoroalkoxy group of (b) may be linear, branched or cyclic, or a combination thereof,

in addition, as Y²And Y³And as Y⁶The alkyl group, the fluoroalkyl group, the alkoxy group and the fluoroalkoxy group of (A) may be interrupted by 1 to 3 linking groups, as long as the linking groups are not adjacent to each other,

furthermore, Y²、Y⁴Or Y⁵Represents a 2-valent cyclic group, or Y⁴Represents an organic group having a valence of 2 of the steroid skeleton, or Y²represents-CH₂-CH(OH)-CH₂-, or Y²Or Y³Represents an alkylene group, or Y⁶When represents an alkyl group or a fluoroalkyl group, the 2-valent cyclic group, the 2-valent organic group having a steroid skeleton, and the-CH₂-CH(OH)-CH₂The alkylene group, the alkyl group and the fluoroalkyl group may be bonded to their adjacent groups via a linking group,

and the above-mentioned linking group represents a group selected from-O-, -CH₂O-, -COO-, -OCO-, -NHCO-, -NH-CO-O-and-NH-CO-NH-,

wherein, Y²～Y⁶Are respectively provided withAn alkylene group having 1 to 15 carbon atoms, a benzene ring, a cyclohexane ring, a heterocycle, a 2-valent organic group having a steroid skeleton, -CH₂-CH(OH)-CH₂Y is a C1-18 alkyl group, a C1-18 fluoroalkyl group, a C1-18 alkoxy group or a C1-18 fluoroalkoxy group²～Y⁶The total number of carbon atoms of (2) is 6 to 30).

A2 nd aspect relates to the cured film-forming composition according to the 1 st aspect, wherein the thermally crosslinkable functional group of the component (A) is a hydroxyl group, a carboxyl group, an amino group or an alkoxysilyl group.

The 3 rd aspect relates to the cured film-forming composition according to the 1 st or 2 nd aspect, wherein the crosslinking agent of the component (B) is a crosslinking agent having a methylol group or an alkoxymethyl group.

The 4 th aspect of the present invention relates to the cured film forming composition according to any one of the 1 st to 3 rd aspects, further comprising (E) a crosslinking catalyst.

A5 th aspect of the present invention relates to the cured film forming composition according to any one of the 1 st to 4 th aspects, wherein the component (B) is contained in an amount of 1 to 300 parts by mass based on 100 parts by mass of the component (A).

The 6 th aspect of the present invention is the cured film-forming composition according to any one of the 1 st to 5 th aspects, wherein one or both of the component (C) and the component (D) is contained in an amount of 0.1 to 100 parts by mass based on 100 parts by mass of the total amount of the polymer as the component (a) and the crosslinking agent as the component (B).

The 7 th aspect of the present invention relates to the cured film forming composition according to any one of the 4 th to 6 th aspects, wherein the component (E) is contained in an amount of 0.01 to 20 parts by mass.

An alignment material according to claim 8 is obtained by curing the composition for forming a cured film according to any one of claims 1 to 7.

From the 9 th aspect, the present invention relates to a retardation material formed using a cured film obtained from the composition for forming a cured film according to any one of the 1 st to 7 th aspects.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the 1 st aspect of the present invention, there can be provided a composition for forming a cured film, which is useful for providing an alignment material having excellent vertical alignment properties and capable of stably vertically aligning a polymerizable liquid crystal under low-temperature short-time firing conditions even on a resin film.

According to the 2 nd aspect of the present invention, there can be provided an alignment material which has excellent vertical alignment properties and can stably vertically align polymerizable liquid crystal under low-temperature short-time firing conditions.

According to the 3 rd aspect of the present invention, a retardation material which can be efficiently formed even on a resin film, has high transparency, high solvent resistance, and adhesion to a substrate (also referred to as a base material) and a liquid crystal film can be provided.

Detailed Description

< composition for Forming cured film >

The composition for forming a cured film of the present invention comprises: (A) a polymer having a vertically-aligned group and a functional group capable of thermal crosslinking, (B) a crosslinking agent, and either or both of (C) an adhesion promoter and (D) a polymer having a thermal-crosslinkable group. The composition for forming a cured film of the present invention may contain a crosslinking catalyst as the component (E) in addition to the components (A), (B), (C) and (D). Further, other additives may be contained as long as the effects of the present invention are not impaired.

The details of each component are described below.

< component (A) >

The component (a) contained in the cured film-forming composition of the present invention is a polymer having a vertically-aligned group and a functional group capable of thermal crosslinking (hereinafter, also referred to as a thermal crosslinkable group) as a side chain.

The polymer of the component (a) of the present invention is not particularly limited, and a copolymer obtained by polymerizing a monomer having an unsaturated double bond such as acrylate, methacrylate, styrene, maleimide, or the like can be preferably used.

That is, as long as the polymer of the component (a) of the present invention is, for example, an acrylic polymer having a side chain containing a vertically-aligned group and a functional group capable of thermal crosslinking (hereinafter, the polymer of the component (a) is also simply referred to as a specific copolymer), the type of the backbone of the main chain and other side chains of the polymer constituting the acrylic copolymer is not particularly limited.

(A) The weight average molecular weight of the polymer of component (A) is preferably 1,000 to 200,000, more preferably 2,000 to 150,000, and still more preferably 3,000 to 100,000. When the weight average molecular weight is too large as exceeding 200,000, the solubility in a solvent may be lowered, and the handling properties may be lowered, and when the weight average molecular weight is too small as less than 1,000, the curing may be insufficient during the thermal curing, and the solvent resistance and heat resistance may be lowered.

As a method for synthesizing the polymer of the component (a), that is, the acrylic copolymer having a specific group such as a vertically-aligned group in a side chain, a method of polymerizing a monomer having a vertically-aligned group, which will be described later, or a method of linking an acrylic polymer having a reactive group and a compound having a vertically-aligned group by a polymer reaction is simple.

Among them, it is convenient to use the following copolymer for the polymer having a vertically-oriented group and a thermally-crosslinkable group as the component (a): the copolymer obtained by copolymerizing a monomer having a vertically aligning group and a monomer having a thermally crosslinkable group, that is, a copolymer obtained by polymerizing a monomer having an unsaturated double bond such as acrylate, methacrylate, styrene, maleimide and the like having the vertically aligning group or the thermally crosslinkable group.

In the present specification, the vertically-aligned group means, for example, a group containing a hydrocarbon group having about 6 to 20 carbon atoms, specifically, a group represented by the following formula [1 ].

Therefore, examples of the monomer having a vertically-oriented group include monomers having a hydrocarbon group having about 6 to 20 carbon atoms. Examples of the hydrocarbon group having 6 to 20 carbon atoms include a linear, branched or cyclic alkyl group having 6 to 20 carbon atoms and a hydrocarbon group having 6 to 20 carbon atoms including an aromatic group. Specific examples of the monomer containing a hydrocarbon group having 6 to 20 carbon atoms include alkyl esters of acrylic acid, alkyl esters of methacrylic acid, alkyl vinyl ethers, 2-alkylstyrene, 3-alkylstyrene, 4-alkylstyrene, and N-alkylmaleimide, and the alkyl group has 6 to 20 carbon atoms.

More specifically, the vertically aligning group is a group represented by the following formula [1], and more specifically, the monomer having a vertically aligning group is a monomer having an unsaturated double bond such as acrylate, methacrylate, styrene, maleimide, or the like, which contains the group represented by the following formula [1 ].

(wherein denotes a connection position.)

Formula [1]In, Y¹Represents a single bond or a linking group.

Formula [1]In, Y²Represents a single bond, an alkylene group having 1 to 15 carbon atoms or-CH₂-CH(OH)-CH₂-。

In addition, as Y²Examples thereof include 2-valent cyclic groups selected from a benzene ring, a cyclohexane ring and a heterocycle, and any hydrogen atom in these cyclic groups may be substituted with an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, a fluoroalkoxy group having 1 to 3 carbon atoms or a fluorine atom.

Examples of the heterocyclic ring include a pyrrole ring, an imidazole ring, an oxazole ring, a thiazole ring, a pyrazole ring, a pyridine ring, a pyrimidine ring, a quinoline ring, a pyrazoline ring, an isoquinoline ring, a carbazole ring, a purine ring, a thiadiazole ring, a pyridazine ring, a pyrazoline ring, a triazine ring, a pyrazolidine ring, a triazole ring, a pyrazine ring, a benzimidazole ring, a cinnoline ring, a phenanthroline ring, an indole ring, a quinoxaline ring, a benzothiazole ring, a phenothiazine ring, an oxadiazole ring, an acridine ring and the like, and more preferred are a pyrrole ring, an imidazole ring, a pyrazole ring, a pyridine ring, a pyrimidine ring, a pyrazoline ring, a carbazole ring, a pyridazine ring, a pyrazoline ring, a pyrazolidine ring, a triazine ring, a pyrazine ring and a benzimidazole ring.

Examples of the alkyl group as the substituent include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and a cyclopropyl group, and examples of the alkoxy group include a group in which an oxygen atom-O-is bonded to the group as the specific example of the alkyl group. Examples of the fluoroalkyl group and the fluoroalkoxy group include those in which a hydrogen atom of any of the alkyl group and the alkoxy group is substituted with a fluorine atom.

Of these, Y is easy to synthesize²Preferably a benzene ring or a cyclohexane ring.

The above formula [1]In, Y³Represents a single bond or an alkylene group having 1 to 15 carbon atoms.

The above formula [1]In, Y⁴Represents a single bond or a 2-valent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocycle, and any hydrogen atom on the cyclic group may be substituted by an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, a fluoroalkoxy group having 1 to 3 carbon atoms or a fluorine atom.

The heterocyclic ring and the alkyl group as the substituent may be Y as described above²Examples of which are listed above.

Further, as Y⁴Preferred examples thereof are 2-valent groups having a structure in which 2 hydrogen atoms are removed from a structure selected from cholestene, androstene, β -cholestene, epiandrosterone, ergosterine, estrone, 11 α -hydroxymethylsterol, 11 α -progesterone, lanosterone, ethinyl estradiol methyl ether, methyltestosterone, norethindrone, pregnenolone, β -sitosterone, stigmastene, testosterone, and cholesteryl acetate, and more specifically, the following examples are given.

(wherein X represents and Y³And Y⁵(or Y)⁶) The connection position of (2). )

Of these, Y is easy to synthesize⁴Preferably a benzene ring, a cyclohexane ring or a C17-30 organic group having a valence of 2 of the steroid skeleton.

Formula [1]In, Y⁵Represents a 2-valent cyclic group selected from a benzene ring, a cyclohexane ring or a heterocycle, and any hydrogen atom on the cyclic group may be substituted by an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms, a fluoroalkyl group having 1 to 3 carbon atoms, a fluoroalkoxy group having 1 to 3 carbon atoms or a fluorine atom. The heterocyclic ring and the alkyl group as the substituent may be Y as described above⁴Examples of which are listed above.

In these, Y⁵Preferably a benzene ring or a cyclohexane ring.

In addition, formula [1]Wherein n represents an integer of 0 to 4, and when n is 2 or more, Y⁵The groups may be the same or different from each other. Among them, n is preferably 0 to 3 from the viewpoint of availability of raw materials and ease of synthesis. More preferably 0 to 2.

Formula [1]In, Y⁶Represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a fluoroalkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms or a fluoroalkoxy group having 1 to 18 carbon atoms.

Wherein, Y⁶Preferably an alkyl group having 1 to 18 carbon atoms, a fluoroalkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 18 carbon atoms or a fluoroalkoxy group having 1 to 10 carbon atoms. Y is⁶More preferably an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms. Y is⁶Particularly preferably an alkyl group having 1 to 9 carbon atoms or an alkoxy group having 1 to 9 carbon atoms.

In addition, Y is⁴In the case of an organic radical having a valence of 2 of the steroid skeleton, Y⁶Preferably a hydrogen atom.

The alkylene group, alkyl group, fluoroalkyl group, alkoxy group, or fluoroalkoxy group recited in the definition of the above formula [1] may be any of linear, branched, or cyclic groups, or a combination thereof.

Examples of the above alkyl group include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group, a 1-methyl-n-butyl group, a 2-methyl-n-butyl group, a 3-methyl-n-butyl group, a1, 1-dimethyl-n-propyl group, a1, 2-dimethyl-n-propyl group, a2, 2-dimethyl-n-propyl group, a 1-ethyl-n-propyl group, a n-hexyl group, a 1-methyl-n-pentyl group, a 2-methyl-n-pentyl group, a 3-methyl-n-pentyl group, a 4-methyl-n-pentyl group, a1, 1-dimethyl-n-butyl group, a1, 2-dimethyl-n-butyl group, a1, 2-ethyl-n-butyl, 1, 2-trimethyl-n-propyl, 1,2, 2-trimethyl-n-propyl, 1-ethyl-1-methyl-n-propyl, 1-ethyl-2-methyl-n-propyl, n-heptyl, 1-methyl-n-hexyl, 2-methyl-n-hexyl, 3-methyl-n-hexyl, 1-dimethyl-n-pentyl, 1, 2-dimethyl-n-pentyl, 1, 3-dimethyl-n-pentyl, 2, 2-dimethyl-n-pentyl, 2, 3-dimethyl-n-pentyl, 3-dimethyl-n-pentyl, 1-ethyl-n-pentyl, 2-ethyl-n-pentyl, 3-ethyl-n-pentyl, 1-methyl-1-ethyl-n-butyl, 1-methyl-2-ethyl-n-butyl, 1, 2-methyl-ethyl-n, 1-ethyl-2-methyl-n-butyl, 2-methyl-2-ethyl-n-butyl, 2-ethyl-3-methyl-n-butyl, n-octyl, 1-methyl-n-heptyl, 2-methyl-n-heptyl, 3-methyl-n-heptyl, 1-dimethyl-n-hexyl, 1, 2-dimethyl-n-hexyl, 1, 3-dimethyl-n-hexyl, 2-dimethyl-n-hexyl, 2, 3-dimethyl-n-hexyl, 3-dimethyl-n-hexyl, 1-ethyl-n-hexyl, 2-ethyl-n-hexyl, 3-ethyl-n-hexyl, 1-methyl-1-ethyl-n-pentyl, 1-methyl-2-ethyl-n-pentyl, 1-methyl-3-ethyl-n-pentyl, 2-methyl-2-ethyl-n, 2-methyl-3-ethyl-n-pentyl group, 3-methyl-3-ethyl-n-pentyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group and the like.

The alkylene group may be a divalent group obtained by removing an arbitrary 1 hydrogen atom from the alkyl group.

Examples of the alkoxy group include groups in which an oxygen atom-O-is bonded to the groups listed as specific examples of the alkyl group.

Examples of the fluoroalkyl group and the fluoroalkoxy group include those in which a hydrogen atom of any of the alkyl group and the alkoxy group is substituted with a fluorine atom.

Above as Y²And Y³And as substituents on the cyclic group or Y⁶The alkyl group, the fluoroalkyl group, the alkoxy group, and the fluoroalkoxy group in (b) may be linear, branched, or cyclic, or a combination thereof.

In addition, as Y²And Y³And as Y⁶The alkyl group, the fluoroalkyl group, the alkoxy group and the fluoroalkoxy group of (a) may be interrupted by 1 to 3 linking groups, as long as the linking groups are not adjacent to each other.

Furthermore, Y²、Y⁴Or Y⁵Represents a 2-valent cyclic group, or Y⁴Represents an organic group having a valence of 2 of the steroid skeleton, or Y²represents-CH₂-CH(OH)-CH₂-, or Y²Or Y³Represents an alkylene group, or Y⁶When represents an alkyl group or a fluoroalkyl group, the 2-valent cyclic group, the 2-valent organic group having a steroid skeleton, and the-CH₂-CH(OH)-CH₂The alkylene group, the alkyl group and the fluoroalkyl group may be bonded to the adjacent groups via a linking group.

In addition, the above-mentioned linking group represents a group selected from-O-, -CH₂O-, -COO-, -OCO-, -NHCO-, -NH-CO-O-and-NH-CO-NH-.

In addition, Y is²～Y⁶Respectively represent alkylene with 1-15 carbon atoms, benzene ring, cyclohexane ring, heterocycle, organic group with 2 valence of steroid skeleton, -CH₂-CH(OH)-CH₂Y is a C1-18 alkyl group, a C1-18 fluoroalkyl group, a C1-18 alkoxy group or a C1-18 fluoroalkoxy group²～Y⁶Has 6 to 30 carbon atoms in total, e.g., 6 to 620。

Among these, in view of the vertical alignment property and the coating property of the polymerizable liquid crystal, the vertical alignment group is preferably a group containing an alkyl group having 7 to 18 carbon atoms, particularly 8 to 15 carbon atoms.

Examples of the preferred vertically-aligning group include hydrocarbon groups having about 6 to 20 carbon atoms. Examples of the hydrocarbon group having 6 to 20 carbon atoms include a linear, branched or cyclic alkyl group having 6 to 20 carbon atoms and a hydrocarbon group having 6 to 20 carbon atoms including an aromatic group.

Examples of the vertically aligning group include the above-mentioned Y¹～Y⁴Is a single bond, Y³A single bond or an alkylene group having 1 to 15 carbon atoms, n is 0, Y⁶A group of C1-18 alkyl group, wherein]The group (a) is preferably a vertically-aligned group (a-1), and the vertically-aligned group (a-1) is an alkyl group having 6 to 20 carbon atoms in total. Specific examples of such an alkyl group include those having 6 to 20 carbon atoms in total in the alkyl group described above.

As the vertical alignment group, in addition to the above, for example, Y is preferable¹～Y⁴Is a single bond, n is 2 to 3, Y⁵Is a group selected from a benzene ring and a cyclohexane ring, Y⁶A vertically-oriented group (a-2) which is an alkyl group having 1 to 18 carbon atoms. The group (a-2) is preferably the following (a-2-1) to (a-2-6).

(in the formula, Y⁶Is an alkyl group having 1 to 18 carbon atoms. In addition, denotes a connection position. )

As the vertical alignment group, in addition to the above, for example, Y is preferable¹～Y³Is a single bond, Y⁴Is a steroid skeleton, n is 0, Y⁶Is a hydrogen atom-containing vertically aligning group (a-3). Examples of such a group (a-3) include vertically-aligned groups (a-3-1) to (a-3-8) represented by the following formulae.

(wherein denotes a connection position.)

Examples of the thermally crosslinkable group include a hydroxyl group, a carboxyl group, an amino group, a blocked isocyanate group, a vinyl group, an allyl group, an acryloyl group, a methacryloyl group, and an alkoxysilyl group. Preferred thermally crosslinkable groups include hydroxyl group, carboxyl group, amino group and alkoxysilyl group, from the viewpoint of forming a thermosetting film at a low temperature in a short time.

Examples of the monomer having the above-mentioned hydroxyl group, carboxyl group, amino group and alkoxysilyl group as a thermally crosslinkable group include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2, 3-dihydroxypropyl acrylate, 2, 3-dihydroxypropyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, caprolactone 2- (acryloyloxy) ethyl ester, caprolactone 2- (methacryloyloxy) ethyl ester, poly (ethylene glycol) ethyl ether acrylate, poly (ethylene glycol) ethyl ether methacrylate, 5-acryloyloxy-6-hydroxynorbornene-2-carboxylic acid-6-lactone and 5-methylpropanediol A monomer having a hydroxyl group such as enoyloxy-6-hydroxynorbornene-2-carboxylic acid-6-lactone; monomers having a carboxyl group such as acrylic acid, methacrylic acid, crotonic acid, mono (2- (acryloyloxy) ethyl) phthalate, mono (2- (methacryloyloxy) ethyl) phthalate, N- (carboxyphenyl) maleimide, N- (carboxyphenyl) acrylamide and N- (carboxyphenyl) methacrylamide; phenolic hydroxyl group-containing monomers such as hydroxystyrene, N- (hydroxyphenyl) acrylamide, N- (hydroxyphenyl) methacrylamide and N- (hydroxyphenyl) maleimide; amino group-containing monomers such as aminoethyl acrylate, aminoethyl methacrylate, aminopropyl acrylate, and aminopropyl methacrylate; and alkoxysilyl group-containing monomers such as acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, acryloxypropyltriethoxysilane, and methacryloxypropyltriethoxysilane.

In the present invention, when an acrylic polymer (specific copolymer) containing a vertically-aligned group and a thermally-crosslinkable group is obtained, other monomers that are copolymerizable with these monomers and do not have the specific functional group (vertically-aligned group and thermally-crosslinkable group) may be used in combination with the above-mentioned monomer having a vertically-aligned group and a thermally-crosslinkable group (preferably, at least one substituent selected from the group consisting of a hydroxyl group, a carboxyl group, an amino group and an alkoxysilyl group), as long as the effects of the present invention are not impaired.

Specific examples of such other monomers include acrylate compounds, methacrylate compounds, maleimide compounds, acrylamide compounds, acrylonitrile, maleic anhydride, styrene compounds, vinyl compounds, and the like.

Specific examples of the other monomers are given below, but the monomers are not limited thereto.

Examples of the acrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl methyl acrylate, phenyl acrylate, glycidyl acrylate, 2,2, 2-trifluoroethyl acrylate, t-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, and 3-methoxybutyl acrylate.

Examples of the methacrylate compound include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, glycidyl methacrylate, 2,2, 2-trifluoroethyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, 2-methoxyethyl methacrylate, methoxytriethylene glycol methacrylate, 2-ethoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, 3-methoxybutyl methacrylate, and γ -butyrolactone methacrylate.

Examples of the maleimide compound include maleimide, N-methylmaleimide, and N-ethylmaleimide.

Examples of the styrene compound include styrene, methylstyrene, chlorostyrene, bromostyrene, and the like.

Examples of the vinyl compound include methyl vinyl ether, benzyl vinyl ether, vinyl naphthalene, vinyl carbazole, allyl glycidyl ether, 3-vinyl-7-oxabicyclo [4.1.0] heptane, 1, 2-epoxy-5-hexene, and 1, 7-octadiene monoepoxide.

As described above, the method for synthesizing the specific copolymer (acrylic copolymer having a vertically-oriented group and a thermally crosslinkable group) which is the polymer of the component (a) is simple and convenient, and the method for copolymerizing at least one monomer selected from the monomers having a vertically-oriented group, at least one monomer selected from the monomers having a thermally crosslinkable group, and other monomers added as desired.

The amount of each monomer used for obtaining the specific copolymer is preferably 3 to 90 mol% of a monomer having a vertically-oriented group, 3 to 90 mol% of a monomer having a thermally crosslinkable group (hydroxyl group, carboxyl group, amino group, alkoxysilyl group), and 0 to 94 mol% of another monomer having no specific functional group (the total amount of these monomers is 100 mol%), based on the total amount of all the monomers.

If the content of the monomer having a vertical alignment group is less than 3 mol%, it is difficult to impart good vertical liquid crystal alignment. If the content of the monomer having a vertical alignment group is more than 90 mol%, the coating property of the polymerizable liquid crystal is deteriorated and it is difficult to form a uniform retardation film.

Further, if the content of the monomer having a thermally crosslinkable group (preferably, at least one substituent selected from the group consisting of a hydroxyl group, a carboxyl group, an amino group and an alkoxysilyl group) is less than 3 mol%, it is difficult to impart sufficient thermosetting properties and maintain good vertical liquid crystal alignment properties.

The method for obtaining the specific copolymer used in the present invention is not particularly limited, and for example, the specific copolymer can be obtained by performing a polymerization reaction at a temperature of 50 to 110 ℃ in a solvent in which a monomer having a vertically-oriented group and a monomer having a thermally crosslinkable group, and a monomer having no specific functional group and a polymerization initiator, which are added as desired, coexist. In this case, the solvent to be used is not particularly limited as long as it dissolves the monomer having the vertically-oriented group and the monomer having the thermally crosslinkable group, and the monomer not having the specific functional group and the polymerization initiator, which are used as desired. As specific examples thereof, solvents exemplified in < solvent > described later can be preferably used.

The specific copolymer obtained by the above method is usually in the state of a solution dissolved in a solvent. As will be described later, the obtained solution of the specific copolymer can be used as it is as (a solution of) the component (a).

The solution of the specific copolymer obtained by the above method is put into diethyl ether, water or the like under stirring, reprecipitated, and the precipitate formed is filtered and washed, and then dried at normal temperature or under reduced pressure or dried by heating to obtain a powder of the specific copolymer. By the above operation, the polymerization initiator and the unreacted monomer coexisting with the specific copolymer can be removed, and as a result, a purified powder of the specific copolymer can be obtained. In the case where the purification cannot be sufficiently performed by one operation, the obtained powder may be redissolved in a solvent and the above-described operation may be repeated.

In the present invention, the specific copolymer may be used in the form of a powder or a solution obtained by redissolving the purified powder in a solvent described later.

In the present invention, the specific copolymer of the component (a) may be a mixture of a plurality of specific copolymers.

< ingredient (B) >

The component (B) in the composition for forming a cured film of the present invention is a crosslinking agent.

The crosslinking agent as the component (B) is preferably a crosslinking agent having a group capable of forming a crosslink with the functional group capable of thermally crosslinking the component (A), for example, a crosslinking agent having a methylol group or an alkoxymethyl group.

Examples of the compound having such a group include methylol compounds such as alkoxymethylated glycoluril, alkoxymethylated benzoguanamine, and alkoxymethylated melamine.

Specific examples of alkoxymethylated glycolurils include 1,3,4, 6-tetrakis (methoxymethyl) glycoluril, 1,3,4, 6-tetrakis (butoxymethyl) glycoluril, 1,3,4, 6-tetrakis (hydroxymethyl) glycoluril, 1, 3-bis (hydroxymethyl) urea, 1,3, 3-tetrakis (butoxymethyl) urea, 1,3, 3-tetrakis (methoxymethyl) urea, 1, 3-bis (hydroxymethyl) -4, 5-dihydroxy-2-imidazolidinone, and 1, 3-bis (methoxymethyl) -4, 5-dimethoxy-2-imidazolidinone. Commercially available products include glycoluril compounds (trade names: サイメル (registered trademark) 1170 and パウダーリンク (registered trademark) 1174) manufactured by Nippon サイテック & インダストリーズ (old Mitsui サイテック), urea/formaldehyde resins (highly condensed type, trade names: ベッカミン (registered trademark) J-300S, ベッカミン P-955 and ベッカミン N) manufactured by methylated urea resins (trade name: UFR (registered trademark) 65), butylated urea resins (trade names: UFR (registered trademark) 300, U-VAN10S60, U-VAN10R and U-VAN11HV), DIC (old Nippon インキ chemical industry) (old Nippon インキ), and the like.

Specific examples of alkoxymethylated benzoguanamine include tetramethoxymethylbenzguanamine and the like. Commercially available products include those manufactured by Nippon Kogyo No. サイテック & インダストリーズ (old Mitsui No. サイテック) (trade name: サイメル (registered trademark) 1123), and those manufactured by Nippon Kogyo No. ケミカル (trade name: ニカラック (registered trademark) BX-4000, ニカラック BX-37, ニカラック BL-60, ニカラック BX-55H).

Specific examples of alkoxymethylated melamine include hexamethoxymethylmelamine and the like. Commercially available products include methoxymethyl-type melamine compounds (trade names: サイメル (registered trademark) 300, サイメル 301, サイメル 303, サイメル 350) prepared by Nippon サイテック - インダストリーズ (old Mitsui サイテック (Co.)), butoxymethyl-type melamine compounds (trade names: マイコート (registered trademark) 506, マイコート 508), (Nippon und ケミカル -prepared methoxymethyl-type melamine compounds (trade names: ニカラック (registered trademark) MW-30, ニカラック MW-22, ニカラック MW-11, ニカラック MS-001, ニカラック MX-002, ニカラック MX-730, ニカラック MX-750, ニカラック MX-035), butoxymethyl-type melamine compounds (trade name: ニカラック (registered trademark) MX-45, 5636 MX-035), ニカラック MX-410, ニカラック MX-302), and the like.

Further, the compound may be a compound obtained by condensing a melamine compound, a urea compound, a glycoluril compound, and a benzoguanamine compound, in which the hydrogen atom of the amino group is substituted with a hydroxymethyl group or an alkoxymethyl group. For example, a high molecular weight compound produced from a melamine compound and a benzoguanamine compound described in U.S. Pat. No. 6323310 is cited. Examples of commercially available products of the melamine compound include trade names: サイメル (registered trademark) 303 (manufactured by japan サイテック and インダストリーズ (japan corporation) (old mitsui サイテック (japan corporation)) and the like), and commercially available products of the benzoguanamine compound include trade names: サイメル (registered trademark) 1123 (manufactured by Nippon サイテック & インダストリーズ (available from san Dieshi サイテック Co., Ltd.)), etc.

Further, as the crosslinking agent of the component (B), a polymer produced from an acrylamide compound or a methacrylamide compound substituted with a hydroxymethyl group (i.e., a hydroxymethyl group) or an alkoxymethyl group, such as N-hydroxymethylacrylamide, N- (methoxymethyl) methacrylamide, N- (ethoxymethyl) acrylamide, and N- (butoxymethyl) methacrylamide, can be used.

Examples of such polymers include poly (N- (butoxymethyl) acrylamide), a copolymer of N- (butoxymethyl) acrylamide and styrene, a copolymer of N- (hydroxymethyl) methacrylamide and methyl methacrylate, a copolymer of N- (ethoxymethyl) methacrylamide and benzyl methacrylate, and a copolymer of N- (butoxymethyl) acrylamide and benzyl methacrylate and 2-hydroxypropyl methacrylate. The weight average molecular weight (polystyrene equivalent) of such a polymer is 1,000 to 500,000, preferably 2,000 to 200,000, more preferably 3,000 to 150,000, and still more preferably 3,000 to 50,000.

These crosslinking agents may be used alone or in combination of 2 or more. In addition, as the crosslinking agent of the component (B), a polymer (the specific copolymer 2) having an N-alkoxymethyl group and a polymerizable group having a C ═ C double bond as unit structures, which are exemplified in the component (C) described later, can also be used.

The content of the crosslinking agent of component (B) in the composition for forming a cured film of the present invention is preferably 1 to 300 parts by mass, more preferably 5 to 200 parts by mass, based on 100 parts by mass of the polymer as component (a). When the content of the crosslinking agent is too small, the cured film obtained from the composition for forming a cured film has low solvent resistance and low vertical alignment properties. On the other hand, when the content of the crosslinking agent is too large, the vertical alignment property and the storage stability may be deteriorated.

< ingredient (C) >

The composition for forming a cured film of the present invention contains either or both of a component (C) which is an adhesion promoter and a component (D) which is a polymer having a thermally crosslinkable group, which will be described later.

The component (C) of the present invention is a component for improving the adhesiveness of the formed cured film (hereinafter, also referred to as adhesion improving component).

When the specific copolymer 2 is used as the component (B), the component (C) may be the same as the component (B), as described later.

When the cured film formed from the composition for forming a cured film of the present embodiment containing the component (C) is used as an alignment material, the polymerizable functional group of the polymerizable liquid crystal can be linked to the crosslinking reaction site of the alignment material by a covalent bond to improve the adhesion between the alignment material and the layer of the polymerizable liquid crystal. As a result, the retardation material of the present embodiment obtained by laminating the cured polymerizable liquid crystal on the alignment material of the present embodiment can maintain strong adhesion even under high-temperature and high-humidity conditions, and can exhibit high durability against peeling or the like.

The component (C) is preferably a monomer or a polymer having a group selected from a hydroxyl group and an N-alkoxymethyl group and a polymerizable group.

Examples of the component (C) include a compound having a hydroxyl group and a (meth) acryloyl group, a compound having an N-alkoxymethyl group and a (meth) acryloyl group, and a polymer having an N-alkoxymethyl group and a (meth) acryloyl group. Specific examples are shown below.

An example of the component (C) is a hydroxyl group-containing polyfunctional acrylate (hereinafter, also referred to as hydroxyl group-containing polyfunctional acrylate).

Examples of the hydroxyl group-containing polyfunctional acrylate as the component (C) include pentaerythritol triacrylate and dipentaerythritol pentaacrylate.

An example of the component (C) is a compound having 1 acryloyl group and 1 or more hydroxyl groups. Preferred examples of such a compound having 1 acryloyl group and 1 or more hydroxyl groups are mentioned. The compound of component (C) is not limited to the following compound examples.

(in the above formula, R¹¹Represents a hydrogen atom or a methyl group, and m represents an integer of 1 to 10. )

Examples of the compound as the component (C) include compounds having 1 molecule thereof at least 1 polymerizable group containing a C ═ C double bond and at least 1N-alkoxymethyl group.

Examples of the polymerizable group having a C ═ C double bond include an acryloyl group, a methacryloyl group, a vinyl group, an allyl group, and a maleimide group.

Examples of the N, i.e., nitrogen atom of the N-alkoxymethyl group include an amide nitrogen atom, a thioamide nitrogen atom, a urea nitrogen atom, a thiourea nitrogen atom, a carbamate nitrogen atom, and a nitrogen atom bonded to adjacent positions of nitrogen atoms of a nitrogen-containing heterocyclic ring. Thus, the N-alkoxymethyl group may have a structure in which an alkoxymethyl group is bonded to a nitrogen atom selected from the group consisting of an amide nitrogen atom, a thioamide nitrogen atom, a urea nitrogen atom, a thiourea nitrogen atom, a carbamate nitrogen atom, and a nitrogen atom bonded to a nitrogen atom adjacent to a nitrogen atom in a nitrogen-containing heterocycle.

The component (C) may be any one having the above-mentioned group, and examples thereof include compounds represented by the following formula (X1).

(in the formula, R¹Represents a hydrogen atom or a methyl group, R²Represents a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms)

Examples of the alkyl group having 1 to 10 carbon atoms include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group, a 1-methyl-n-butyl group, a 2-methyl-n-butyl group, a 3-methyl-n-butyl group, a1, 1-dimethyl-n-propyl group, a1, 2-dimethyl-n-propyl group, a2, 2-dimethyl-n-propyl group, a 1-ethyl-n-propyl group, a n-hexyl group, a 1-methyl-n-pentyl group, a 2-methyl-n-pentyl group, a 3-methyl-n-pentyl group, a 4-methyl-n-pentyl group, a1, 1-dimethyl-n-butyl group, a1, 2-dimethyl-n-butyl group, a1, 2-ethyl-n-butyl, 1, 2-trimethyl-n-propyl, 1,2, 2-trimethyl-n-propyl, 1-ethyl-1-methyl-n-propyl, 1-ethyl-2-methyl-n-propyl, n-heptyl, 1-methyl-n-hexyl, 2-methyl-n-hexyl, 3-methyl-n-hexyl, 1-dimethyl-n-pentyl, 1, 2-dimethyl-n-pentyl, 1, 3-dimethyl-n-pentyl, 2, 2-dimethyl-n-pentyl, 2, 3-dimethyl-n-pentyl, 3-dimethyl-n-pentyl, 1-ethyl-n-pentyl, 2-ethyl-n-pentyl, 3-ethyl-n-pentyl, 1-methyl-1-ethyl-n-butyl, 1-methyl-2-ethyl-n-butyl, 1, 2-methyl-ethyl-n, 1-ethyl-2-methyl-n-butyl, 2-methyl-2-ethyl-n-butyl, 2-ethyl-3-methyl-n-butyl, n-octyl, 1-methyl-n-heptyl, 2-methyl-n-heptyl, 3-methyl-n-heptyl, 1-dimethyl-n-hexyl, 1, 2-dimethyl-n-hexyl, 1, 3-dimethyl-n-hexyl, 2-dimethyl-n-hexyl, 2, 3-dimethyl-n-hexyl, 3-dimethyl-n-hexyl, 1-ethyl-n-hexyl, 2-ethyl-n-hexyl, 3-ethyl-n-hexyl, 1-methyl-1-ethyl-n-pentyl, 1-methyl-2-ethyl-n-pentyl, 1-methyl-3-ethyl-n-pentyl, 2-methyl-2-ethyl-n, 2-methyl-3-ethyl-n-pentyl group, 3-methyl-3-ethyl-n-pentyl group, n-nonyl group, n-decyl group and the like.

Specific examples of the compound represented by the formula (X1) include an acrylamide compound or a methacrylamide compound substituted with a hydroxymethyl group or an alkoxymethyl group, such as N-hydroxymethyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, and N-butoxymethyl (meth) acrylamide. The term (meth) acrylamide refers to both methacrylamide and acrylamide.

As another embodiment of the compound having a polymerizable group having a C ═ C double bond and an N-alkoxymethyl group in the component (C), for example, a compound represented by the following formula (X2) is preferably exemplified.

In the formula, R⁵¹Represents a hydrogen atom or a methyl group. R⁵²And R⁵³Each independently represents a linear or branched alkylene group having 2 to 20 carbon atoms, an aliphatic ring group having 5 to 6 carbon atoms, or an aliphatic group containing an aliphatic ring having 5 to 6 carbon atoms, and may contain an ether bond in the structure. R⁵⁴Represents a straight-chain or branched alkyl group having 1 to 20 carbon atoms, an aliphatic ring group having 5 to 6 carbon atoms, or an aliphatic group containing an aliphatic ring having 5 to 6 carbon atoms, wherein one methylene group or a plurality of non-adjacent methylene groups in the group may be etherifiedBond substitution. Z represents > NCOO-, or-OCON < (where "-" represents 1 linkage; and ">" < "represents 2 linkages, and represents that an alkoxymethyl group is bonded to 1 chemical bond). r is a natural number of 2 to 9.

As R⁵³And R⁵⁴Specific examples of the alkylene group having 2 to 20 carbon atoms in the definition of (1) include groups having 2 to 9 valences obtained by further removing 1 to 8 hydrogen atoms from an alkyl group having 2 to 20 carbon atoms.

Specific examples of the alkyl group having 2 to 20 carbon atoms include ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, 1-methyl-n-butyl group, 2-methyl-n-butyl group, 3-methyl-n-butyl group, 1-dimethyl-n-propyl group, n-hexyl group, 1-methyl-n-pentyl group, 2-methyl-n-pentyl group, 1-dimethyl-n-butyl group, 1-ethyl-n-butyl group, 1, 2-trimethyl-n-propyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group, n-nonadecyl group, n-eicosyl group, cyclopentyl group, cyclohexyl group, a group in which one or more of these groups, And a group in which one methylene group or a plurality of non-adjacent methylene groups in these groups are substituted with an ether bond.

Among these, an alkylene group having 2 to 10 carbon atoms is preferable, and R is particularly preferable from the viewpoint of availability of raw materials and the like⁵³Is ethylene, R⁵⁴Is hexamethylene.

As R⁵²Specific examples of the alkyl group having 1 to 20 carbon atoms in the definition of (1) include R⁵³And R⁵⁴Examples of the alkyl group having 2 to 20 carbon atoms in the definition of (1) and a methyl group. Among these, an alkyl group having 1 to 6 carbon atoms is preferable, and a methyl group, an ethyl group, an n-propyl group, or an n-butyl group is particularly preferable.

R is a natural number of 2 to 9, and preferably 2 to 6.

Compound (X2) can be produced by the following reaction schemeObtained by the method. That is, a urethane compound having an acryloyl group or a methacryloyl group represented by the following formula (X2-1) (hereinafter also referred to as compound (X2-1)) is added with chlorotrimethylsilane and paraformaldehyde (usually represented by the formula (CH)₂O) n) to synthesize an intermediate represented by the following formula (X2-2), and adding R to the reaction solution⁵²An alcohol represented by-OH and subjected to a reaction, thereby producing.

In the formula, R⁵¹、R⁵²、R⁵³、R⁵⁴Z and r are as defined above, and X is-NHCOO-or-OCONH-.

The amount of trimethylchlorosilane and paraformaldehyde used relative to the compound (X2-1) is not particularly limited, but for completion of the reaction, 1.0 to 6.0 equivalent times of trimethylchlorosilane is preferably used relative to 1 urethane bond in the molecule, 1.0 to 3.0 equivalent times of paraformaldehyde is preferably used, and the amount of trimethylchlorosilane used is more than the amount of paraformaldehyde used.

The reaction solvent is not particularly limited as long as it is a solvent inactive to the reaction, and examples thereof include hydrocarbons such as hexane, cyclohexane, benzene, and toluene; halogen hydrocarbons such as dichloromethane, carbon tetrachloride, chloroform, and 1, 2-dichloroethane; ethers such as diethyl ether, diisopropyl ether, 1, 4-dioxane and tetrahydrofuran; nitriles such as acetonitrile and propionitrile; nitrogen-containing aprotic polar solvents such as N, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, and 1, 3-dimethyl-2-imidazolidinone; pyridines such as pyridine and picoline. These solvents may be used alone, or 2 or more of these solvents may be mixed and used. Dichloromethane and chloroform are preferable, and dichloromethane is more preferable.

The amount of the solvent used (reaction concentration) is not particularly limited, and the reaction may be carried out without using a solvent, and when a solvent is used, the amount of the solvent is 0.1 to 100 times by mass based on the compound (X2-1). Preferably 1 to 30 times by mass, and more preferably 2 to 20 times by mass.

The reaction temperature is not particularly limited, and is, for example, -90 to 200 ℃, preferably-20 to 100 ℃, and more preferably-10 to 50 ℃.

The reaction time is usually 0.05 to 200 hours, preferably 0.5 to 100 hours.

The reaction may be carried out under normal pressure or under increased pressure, and may be carried out batchwise or continuously.

During the reaction, a polymerization inhibitor may be added. As such a polymerization inhibitor, BHT (2, 6-di-t-butyl-p-cresol), hydroquinone, p-methoxyphenol, and the like can be used, and there is no particular limitation as long as polymerization of acryloyl group and methacryloyl group is not inhibited.

The amount of the polymerization inhibitor added is not particularly limited, but is 0.0001 to 10 wt%, preferably 0.01 to 1 wt%, based on the total amount (by mass) of the compound (X2-1). In the present specification, wt% means mass%.

In the step of reacting the intermediate (X2-2) with an alcohol, a base may be added to suppress hydrolysis under acidic conditions. Examples of the base include pyridines such as pyridine and picoline, and tertiary amines such as trimethylamine, triethylamine, diisopropylethylamine, and tributylamine. Preferably triethylamine and diisopropylethylamine, and more preferably triethylamine. The amount of the base to be added is not particularly limited, and may be 0.01 to 2.0 equivalent times, and more preferably 0.5 to 1.0 equivalent times the amount of trimethylchlorosilane to be used in the reaction.

Further, after obtaining an intermediate (X2-2) from the compound (X2-1), an alcohol may be added to the reaction mixture to carry out the reaction without isolating the intermediate (X2-2).

The method for synthesizing the compound (X2-1) is not particularly limited, and it can be produced by reacting a (meth) acryloyloxyalkyl isocyanate with a polyol compound or reacting a hydroxyalkyl (meth) acrylate compound with a polyisocyanate compound.

Specific examples of the (meth) acryloyloxyalkyl isocyanate include 2-methacryloyloxyethyl isocyanate (trade name: カレンズ MOI [ registered trademark ]), 2-acryloyloxyethyl isocyanate (trade name: カレンズ AOI [ registered trademark ]), and the like.

Specific examples of the polyol compound include glycol compounds such as ethylene glycol, propylene glycol, 1, 4-butanediol, 1, 3-butanediol, 1, 5-pentanediol, neopentyl glycol, 3-methyl-1, 5-pentanediol, 1, 6-hexanediol, and 1, 4-cyclohexanedimethanol, triol compounds such as glycerin and trimethylolpropane, pentaerythritol, dipentaerythritol, and diglycerol.

Specific examples of the hydroxyalkyl (meth) acrylate compound include monomers having a hydroxyl group such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, poly (ethylene glycol) ethyl ether acrylate, and poly (ethylene glycol) ethyl ether methacrylate.

Specific examples of the polyisocyanate compound include aliphatic diisocyanates such as hexamethylene diisocyanate, 2,4, 4-trimethylhexamethylene diisocyanate and dimer acid diisocyanate, alicyclic diisocyanates such as isophorone diisocyanate, 4,4 '-methylenebis (cyclohexyl isocyanate) and ω, ω' -diisocyanate dimethylcyclohexane, lysine ester triisocyanate, 1,6, 11-undecane triisocyanate, 1, 8-diisocyanate-4-isocyanatomethyloctane, 1,3, 6-hexamethylene triisocyanate and bicycloheptane triisocyanate.

These (meth) acryloyloxyalkyl isocyanate compounds, polyol compounds, hydroxyalkyl (meth) acrylate compounds and polyisocyanate compounds are generally commercially available, and can be synthesized by a known method.

Further, as an example of the component (C), there can be mentioned a polymer having an N-alkoxymethyl group and a polymerizable group having a C ═ C double bond as a unit structure (hereinafter, also referred to as a specific copolymer 2). As described above, it may also serve as a crosslinking agent for the component (B), that is, in this case, the component (C) may be the same as the component (B).

The specific copolymer may be a polymer having a repeating unit structure including two groups, i.e., an N-alkoxymethyl group and a polymerizable group having a C ═ C double bond, or a repeating unit structure including an N-alkoxymethyl group and a repeating unit including a polymerizable group having a C ═ C double bond, or a polymer having a repeating unit structure including two groups, i.e., an N-alkoxymethyl group and a polymerizable group having a C ═ C double bond, or a repeating unit structure including at least one of a repeating unit structure including an N-alkoxymethyl group and a repeating unit including a polymerizable group having a C ═ C double bond. Among these, as the specific copolymer 2, a polymer having a repeating unit structure including an N-alkoxymethyl group and a repeating unit including a polymerizable group having a C ═ C double bond can be suitably used.

Hereinafter, a specific copolymer 2 (also referred to as a polymer of the component (C)) as an example of the component (C) will be described.

Examples of the N, i.e., nitrogen atom of the N-alkoxymethyl group include an amide nitrogen atom, a thioamide nitrogen atom, a urea nitrogen atom, a thiourea nitrogen atom, a carbamate nitrogen atom, and a nitrogen atom bonded to adjacent positions of nitrogen atoms of a nitrogen-containing heterocyclic ring. Thus, the N-alkoxymethyl group may have a structure in which an alkoxymethyl group is bonded to a nitrogen atom selected from the group consisting of an amide nitrogen atom, a thioamide nitrogen atom, a urea nitrogen atom, a thiourea nitrogen atom, a carbamate nitrogen atom, and a nitrogen atom bonded to adjacent positions of nitrogen atoms of a nitrogen-containing heterocyclic ring.

The monomer that provides an N-alkoxymethyl group (hereinafter, also referred to as the specific monomer X1) may be any monomer having the above-mentioned group, and examples thereof include a compound represented by the above-mentioned formula (X1) (R in the formula)²A compound which represents a linear or branched alkyl group having 1 to 10 carbon atoms).

The polymerizable group having a C ═ C double bond may be incorporated into a side chain of the main skeleton of the polymer, that is, a side chain of the polymer of the component (C), as a specific side chain having a polymerizable group having a C ═ C double bond.

(C) The specific side chain having a polymerizable group containing a C ═ C double bond in component (a) is preferably a side chain having 3 to 16 carbon atoms and an unsaturated bond at the terminal, and particularly preferably a specific side chain represented by the following formula (b 2). For example, as shown in the formula (b2-1), a specific side chain represented by the formula (b2) is bonded to an ester bond portion of the acrylic polymer.

In the formula (b2), R⁶¹The carbon number of (b) is 1 to 14, and is an organic group selected from an aliphatic group, an aliphatic group containing a cyclic structure, and an aromatic group, or an organic group formed by a combination of a plurality of organic groups selected from the above groups. R⁶¹May contain an ester bond, an ether bond, an amide bond, a urethane bond or the like.

In the specific side chain represented by the formula (b2), R⁶²Is a hydrogen atom or a methyl group, particularly preferably R⁶²Is a specific side chain of a hydrogen atom. More preferably a specific side chain terminating in an acryloyl group, methacryloyl group or vinylphenyl group.

In the formula (b2-1), R⁶³Is a hydrogen atom or a methyl group.

The method for obtaining such a polymer having a specific side chain is not particularly limited.

As an example, an acrylic polymer having a specific functional group (hereinafter, also referred to as a polymer having a specific functional group) described later is produced in advance by a polymerization method such as radical polymerization (note that, as described later, an N-alkoxymethyl group has been introduced into the acrylic copolymer having a specific functional group). Then, the specific functional group is reacted with a compound having an unsaturated bond (C ═ C double bond) at the terminal (hereinafter, referred to as a specific compound) to form a specific side chain, whereby a polymerizable group having a C ═ C double bond is introduced, whereby a polymer of the component (C) can be obtained.

The specific functional group here means a functional group such as a carboxyl group, a glycidyl group, a hydroxyl group, an amino group having an active hydrogen, a phenolic hydroxyl group, or an isocyanate group, or a plurality of functional groups selected from these.

In the above-mentioned reaction for forming a specific side chain, preferred combinations of the specific functional group and a group participating in the reaction with the functional group (forming a characteristic side chain) of the specific compound are a carboxyl group and an epoxy group, a hydroxyl group and an isocyanate group, a phenolic hydroxyl group and an epoxy group, a carboxyl group and an isocyanate group, an amino group and an isocyanate group, a hydroxyl group and an acid chloride, and the like. Further, a more preferred combination is carboxyl group and glycidyl methacrylate, or hydroxyl group and isocyanoethyl methacrylate.

The polymer having a specific functional group used in the reaction for forming a specific side chain is preferably a polymer having an N-alkoxymethyl group and a specific functional group. That is, the polymer having a specific functional group is preferably a copolymer obtained by using, as essential components, a specific monomer X1 which is a monomer providing an N-alkoxymethyl group and a monomer having a functional group (specific functional group) for reacting with a specific compound which is a compound having an unsaturated bond (C ═ C double bond) at the terminal, that is, a monomer having a carboxyl group, a glycidyl group, a hydroxyl group, an amino group having an active hydrogen, a phenolic hydroxyl group, an isocyanate group, or the like (hereinafter, also referred to as a specific monomer X3), and the number average molecular weight thereof is preferably 2,000 to 25,000. Here, the monomers having a specific functional group to be used for polymerization may be used alone or in combination of two or more, as long as they are not reacted during polymerization.

Specific examples of the specific monomer X3, which is a monomer necessary for obtaining a polymer having a specific functional group, are given below. But are not limited thereto.

Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, crotonic acid, mono (2- (acryloyloxy) ethyl) phthalate, mono (2- (methacryloyloxy) ethyl) phthalate, N- (carboxyphenyl) maleimide, N- (carboxyphenyl) methacrylamide, and N- (carboxyphenyl) acrylamide.

Examples of the monomer having a glycidyl group include glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, 3-vinyl-7-oxabicyclo [4.1.0] heptane, 1, 2-epoxy-5-hexene, and 1, 7-octadiene monoepoxide.

Examples of the monomer having a hydroxyl group include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2, 3-dihydroxypropyl acrylate, 2, 3-dihydroxypropyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, 2- (acryloyloxy) ethyl caprolactone, 2- (methacryloyloxy) ethyl caprolactone, poly (ethylene glycol) ethyl ether acrylate, poly (ethylene glycol) ethyl ether methacrylate, 5-acryloyloxy-6-hydroxynorbornene-2-carboxylic acid-6-lactone and 5-methacryloyloxy-6-hydroxynorbornene-2-carboxylbenzene-2-carboxylic acid Acid-6-lactones, and the like.

Examples of the monomer having an amino group include 2-aminoethyl acrylate and 2-aminomethyl methacrylate.

Examples of the monomer having a phenolic hydroxyl group include hydroxystyrene, N- (hydroxyphenyl) acrylamide, N- (hydroxyphenyl) methacrylamide, and N- (hydroxyphenyl) maleimide.

Examples of the monomer having an isocyanate group include acryloylethyl isocyanate, methacryloylethyl isocyanate, m-tetramethylxylene isocyanate, and the like.

As described above, in the specific side chain represented by the above formula (b2) obtained by the reaction with the above specific functional group, R is⁶¹Specific examples of (A) include the following formulae (B-1) to (B-11).

(wherein R represents⁶²Bonded to form a double bondThe bonding site of the carbon atom (b). )

In the present invention, in addition to the specific monomer X1 and the specific monomer X3, a monomer copolymerizable with the above-mentioned monomer(s) and having no functional group capable of thermal crosslinking (i.e., hydroxyl group, carboxyl group, amino group, alkoxysilyl group, etc.) of the above-mentioned component (a) may be used in combination for obtaining the polymer of the component (C).

Specific examples of such monomers include an acrylate compound or a methacrylate compound having a structure different from that of the specific monomer X1 and the specific monomer X3, a maleimide compound, an acrylamide compound, acrylonitrile, maleic anhydride, a styrene compound, a vinyl compound, and the like (hereinafter, also referred to as a monomer X4).

Specific examples of the monomer X4 are given below, but the monomer X4 is not limited thereto.

Examples of the acrylate compound as the monomer X4 include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl methyl acrylate, phenyl acrylate, glycidyl acrylate, 2,2, 2-trifluoroethyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate, 2-methyl-2-adamantyl acrylate, 2-propyl-2-adamantyl acrylate, 8-methyl-8-tricyclodecanyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, benzyl acrylate, phenyl acrylate, glycidyl acrylate, 2,2, And 8-ethyl-8-tricyclodecanyl acrylate.

Examples of the methacrylate compound as the monomer X4 include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methacrylate, phenyl methacrylate, glycidyl methacrylate, 2,2, 2-trifluoroethyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, 2-methoxyethyl methacrylate, methoxytriethylene glycol methacrylate, 2-ethoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, 3-methoxybutyl methacrylate, 2-methyl-2-adamantyl methacrylate, and mixtures thereof, Gamma-butyrolactone methacrylate, 2-propyl-2-adamantyl methacrylate, 8-methyl-8-tricyclodecyl methacrylate, and 8-ethyl-8-tricyclodecyl methacrylate.

Examples of the vinyl compound as an example of the monomer X4 include methyl vinyl ether, benzyl vinyl ether, vinyl naphthalene, vinyl carbazole, allyl glycidyl ether, 3-vinyl-7-oxabicyclo [4.1.0] heptane, 1, 2-epoxy-5-hexene, and 1, 7-octadiene monoepoxide.

Examples of the styrene compound as the monomer X4 include styrene, methylstyrene, chlorostyrene, bromostyrene, and the like.

Examples of the maleimide compound as the monomer X4 include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.

(C) The proportion of the N-alkoxymethyl group present in the polymer of component (a) is preferably from 40 to 90 mol%, more preferably from 50 to 85 mol%, based on 100 mol of all the repeating units in the polymer.

That is, the amount of the specific monomer X1 (N-alkoxymethyl group-providing monomer) used to obtain the specific copolymer 2 as the component (C) is preferably 40 to 90 mol%, and more preferably 50 to 85 mol%, based on the total amount of all the monomers used to obtain the specific copolymer 2 as the component (C).

If the total amount is less than 40 mol%, curing by thermal crosslinking with the component (a) may be insufficient, and if it exceeds 90 mol%, adhesion to the liquid crystal layer may be adversely affected.

(C) The proportion of the polymerizable group having a C ═ C double bond in the polymer of component (a) is preferably 10 to 60 mol%, more preferably 15 to 50 mol%, based on 100 mol of all the repeating units in the polymer.

That is, the amount of the specific monomer X3 (monomer having a functional group (specific functional group) for reacting with a specific compound which is a compound having an unsaturated bond (C ═ C double bond) at the terminal) used to obtain the specific copolymer 2 as the component (C) is preferably 10 to 60 mol%, more preferably 15 to 50 mol%, based on the total amount of all monomers used to obtain the specific copolymer 2 as the component (C).

When the total amount is less than 10 mol%, adhesion to the liquid crystal layer may be insufficient, and when it exceeds 60 mol%, curing by thermal crosslinking with the component (a) may be insufficient.

The method for obtaining the specific copolymer 2 as an example of the component (C) is not particularly limited, and for example, it can be obtained by carrying out a polymerization reaction at a temperature of 50 to 110 ℃ in a solvent in which the specific monomer X1, the specific monomer X3, and if necessary, a monomer other than the monomer (for example, monomer X4) and a polymerization initiator coexist. In this case, the solvent to be used is not particularly limited as long as it dissolves the specific monomer X1, the specific monomer X3, and other monomers and polymerization initiators used as needed. Specific examples thereof are described in the section of [ solvent ] described later.

The acrylic polymer as an example of the component (C) obtained by the above method is usually in the state of a solution dissolved in a solvent, and in the present invention, it can be used as it is in the form of a solution of the component (C).

Further, the solution of the acrylic polymer as an example of the component (C) obtained by the above-mentioned method is put into diethyl ether, water or the like under stirring to reprecipitate, and the formed precipitate is filtered and washed, and then dried at normal temperature or under reduced pressure or dried by heating to obtain a powder of the specific copolymer 2 as the component (C). By the above-mentioned operation, the polymerization initiator and the unreacted monomer which coexist with the specific copolymer 2 of the component (C) can be removed, and as a result, a purified powder of the specific copolymer 2 as an example of the component (C) can be obtained. In the case where the purification cannot be sufficiently performed by one operation, the obtained powder may be redissolved in a solvent and the above-described operation may be repeated.

In the composition for forming a cured film on the surface of an optical film of the present invention, the specific copolymer 2 of component (C) may be used in the form of a powder or a solution obtained by redissolving a purified powder in a solvent described later.

In the composition for forming a cured film on the surface of an optical film of the present invention, the specific copolymer 2 as the component (C) may be a mixture of a plurality of types.

The weight average molecular weight of the polymer is 1,000 to 500,000, preferably 2,000 to 200,000, more preferably 3,000 to 150,000, and still more preferably 3,000 to 50,000.

The content of the component (C) in the cured film-forming composition according to the embodiment of the present invention is preferably 0.1 to 100 parts by mass, and more preferably 5 to 70 parts by mass, based on 100 parts by mass of the total amount of the polymer as the component (a) and the crosslinking agent as the component (B). When the content of the component (C) is 0.1 parts by mass or more, sufficient adhesion can be provided to the formed cured film. However, when it is more than 100 parts by mass, the liquid crystal alignment property is liable to be lowered.

When the component (B) is the specific copolymer 2, and the component (C) is the same as the component (B) (the same compound), the amount of the component (B) is regarded as the amount of the component (C) (in this case, the amount of the component (C) is 0 in terms of the amount of the component (C) to be blended).

In the cured film-forming composition of the present embodiment, the component (C) may be a mixture of a plurality of compounds of the component (C).

< ingredient (D) >

The composition for forming a cured film of the present invention contains either or both of the above-mentioned component (C) which is an adhesion promoter and the component (D) which is a polymer having a thermally crosslinkable group.

Examples of the polymer (hereinafter also referred to as a specific polymer) as the component (D) in the present invention include polymers having a linear structure or a branched structure such as an acrylic polymer, a polyamic acid, a polyimide, a polyvinyl alcohol, a polyester polycarboxylic acid, a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, a polyalkylene imine, a polyallylamine, a cellulose (cellulose or a derivative thereof), a phenol novolac resin, a melamine formaldehyde resin, and cyclic polymers such as cyclodextrins.

Specific polymers as the component (D) include acrylic polymers, hydroxyalkyl cyclodextrins, celluloses, polyether polyols, polyester polyols, polycarbonate polyols, and polycaprolactone polyols.

The acrylic polymer, which is a preferable example of the specific polymer as the component (D), is not particularly limited in kind of the backbone and side chain of the main chain of the polymer constituting the acrylic polymer, as long as it is a polymer obtained by polymerizing a monomer having an unsaturated double bond such as acrylic acid, methacrylic acid, styrene, or a vinyl compound, and is a polymer obtained by polymerizing a monomer containing a monomer having the specific functional group D described below or a mixture thereof.

Examples of the monomer having the specific functional group D include a monomer having a polyethylene glycol ester group, a monomer having a hydroxyalkyl ester group having 2 to 5 carbon atoms, a monomer having a phenolic hydroxyl group, a monomer having a carboxyl group, a monomer having an amino group, a monomer having an alkoxysilyl group, a monomer having an acetoacetoxy group, and a monomer having an amide group.

Examples of the monomer having a polyethylene glycol ester group include H- (OCH)₂CH₂) Monoacrylates or monomethacrylates of p-OH. The p value is 2 to 50, preferably 2 to 10.

Examples of the monomer having a hydroxyalkyl ester group having 2 to 5 carbon atoms include 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate and 4-hydroxybutyl methacrylate.

Examples of the monomer having a phenolic hydroxyl group include p-hydroxystyrene, m-hydroxystyrene and o-hydroxystyrene.

Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, and vinylbenzoic acid.

Examples of the monomer having an amino group in a side chain include 2-aminoethyl acrylate, 2-aminoethyl methacrylate, aminopropyl acrylate and aminopropyl methacrylate.

Examples of the monomer having an alkoxysilyl group in a side chain include 3-acryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, allyltrimethoxysilane, and allyltriethoxysilane.

Examples of the monomer having an acetoacetoxy group in a side chain include 2-acetoacetoxyethyl acrylate and 2-acetoacetoxyethyl methacrylate.

In the present embodiment, when synthesizing an acrylic polymer as an example of the component (D), a monomer not having the specific functional group D described above, for example, a monomer not having any of a hydroxyl group, a carboxyl group, an amide group, an amino group, an alkoxysilyl group, and an acetoacetoxy group may be used in combination as long as the effect of the present invention is not impaired.

Specific examples of such monomers include acrylate compounds, methacrylate compounds, maleimide compounds, acrylonitrile, maleic anhydride, styrene compounds, vinyl compounds, and the like.

Examples of the acrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl methyl acrylate, phenyl acrylate, 2,2, 2-trifluoroethyl acrylate, t-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate, 2-methyl-2-adamantyl acrylate, 2-propyl-2-adamantyl acrylate, 8-methyl-8-tricyclodecanyl acrylate, and 8-ethyl-8-tricyclodecanyl acrylate.

Examples of the methacrylate compound include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, 2,2, 2-trifluoroethyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, 2-methoxyethyl methacrylate, methoxytriethylene glycol methacrylate, 2-ethoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, 3-methoxybutyl methacrylate, 2-methyl-2-adamantyl methacrylate, 2-propyl-2-adamantyl methacrylate, 8-methyl-8-tricyclodecanyl methacrylate, and mixtures thereof, And 8-ethyl-8-tricyclodecyl methacrylate.

Examples of the maleimide compound include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.

Examples of the vinyl compound include vinyl ether, methyl vinyl ether, benzyl vinyl ether, 2-hydroxyethyl vinyl ether, phenyl vinyl ether, and propyl vinyl ether.

The amount of the monomer having the specific functional group D used for obtaining the acrylic polymer as an example of the component (D) is preferably 2 to 98 mol% based on the total amount of all the monomers used for obtaining the acrylic polymer as the component (D). If the amount of the monomer having the specific functional group D is too small, the liquid crystal alignment property of the obtained cured film tends to be insufficient, and if it is too large, the compatibility with the component (a) tends to be lowered.

The method for obtaining the acrylic polymer as an example of the component (D) is not particularly limited, and for example, it is obtained by a polymerization reaction at a temperature of 50 to 110 ℃ in a solvent in which a monomer containing a monomer having the specific functional group D, a monomer having no specific functional group D used as needed, a polymerization initiator, and the like coexist. In this case, the solvent to be used is not particularly limited as long as it dissolves the monomer having the specific functional group D and, if necessary, the monomer having no specific functional group D and the polymerization initiator. Specific examples thereof are described in the section of [ solvent ] described later.

The acrylic polymer as an example of the component (D) obtained by the above method is usually in the state of a solution dissolved in a solvent.

The acrylic polymer solution as an example of the component (D) obtained by the above method is put into diethyl ether, water or the like under stirring to reprecipitate, and the formed precipitate is filtered and washed, and then dried at normal temperature or under reduced pressure or dried by heating to obtain an acrylic polymer powder as an example of the component (D). By the above-mentioned operation, the polymerization initiator and the unreacted monomer which coexist with the acrylic polymer as the component (D) can be removed, and as a result, a purified powder of the acrylic polymer as the component (B) can be obtained. When the purification cannot be sufficiently performed by one operation, the obtained powder may be redissolved in a solvent, and the above-described operation may be repeated.

The acrylic polymer as a preferable example of the component (D) has a weight average molecular weight of preferably 3,000 to 200,000, more preferably 4,000 to 150,000, and further preferably 5,000 to 100,000. When the weight average molecular weight is too large as higher than 200,000, the solubility in a solvent may be lowered and the handling property may be lowered, and when the weight average molecular weight is too small as lower than 3,000, the curing may be insufficient at the time of thermal curing, and the solvent resistance and heat resistance may be lowered. The weight average molecular weight is a value obtained by Gel Permeation Chromatography (GPC) using polystyrene as a standard sample. Hereinafter, the same is also applied to the present specification.

Further, preferable examples of the polyether polyol as the specific polymer of the component (D) include products obtained by adding propylene oxide, polyethylene glycol, polypropylene glycol, or the like to a polyol such as polyethylene glycol, polypropylene glycol, propylene glycol, bisphenol a, triethylene glycol, or sorbitol. Specific examples of the polyether polyol include アデカポリエーテル P series, G series, EDP series, BPX series, FC series, CM series, ユニオックス (registered trademark) HC-40, HC-60, ST-30E, ST-40E, G-450, G-750, ユニオール (registered trademark) TG-330, TG-1000, TG-3000, TG-4000, HS-1600D, DA-400, DA-700, DB-400, ノニオン (registered trademark) LT-221, ST-221, OT-221 and the like manufactured by ADEKA.

Examples of the polyester polyol which is a preferable example of the specific polymer as the component (D) include products obtained by reacting a polycarboxylic acid such as adipic acid, sebacic acid, or isophthalic acid with a glycol such as ethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, or polypropylene glycol. Specific examples of the polyester polyol include ポリライト (registered trademark) OD-X-286, OD-X-102, OD-X-355, OD-X-2330, OD-X-240, OD-X-668, OD-X-2108, OD-X-2376, OD-X-2044, OD-X-688, OD-X-2068, OD-X-2547, OD-X-2420, OD-X-2523, OD-X-2555, OD-X-2560, (strain) クラレポリオール P-510, P-1010, P-2010, P-3010, P-4010, P-5010, P-6010, F-510, F-1010, and the like, F-2010, F-3010, P-1011, P-2011, P-2013, P-2030, N-2010, PNNA-2016, and the like.

As a preferable example of the polycaprolactone polyol as the specific polymer of the component (D), a product obtained by ring-opening polymerization of epsilon-caprolactone using a polyol such as trimethylolpropane or ethylene glycol as an initiator can be mentioned. Specific examples of polycaprolactone polyols include ポリライト (registered trademark) OD-X-2155, OD-X-640, OD-X-2568, manufactured by DIC (trade name) and プラクセル (registered trademark) 205, manufactured by ダイセル, L205AL, 205U, 208, 210, 212, L212AL, 220, 230, 240, 303, 305, 308, 312, and 320.

Examples of the polycarbonate polyol which is a preferable example of the specific polymer as the component (D) include products obtained by reacting a polyhydric alcohol such as trimethylolpropane or ethylene glycol with diethyl carbonate, diphenyl carbonate, ethylene carbonate, or the like. Specific examples of the polycarbonate polyol include プラクセル (registered trademark) CD205, CD205PL, CD210, CD220 (manufactured by LTD ダイセル), C-590, C-1050, C-2050, C-2090, and C-3090 (manufactured by LTD クラレ).

Preferable examples of the cellulose as the specific polymer of the component (D) include hydroxyalkyl celluloses such as hydroxyethyl cellulose and hydroxypropyl cellulose, hydroxyalkyl celluloses such as hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl ethyl cellulose, and preferable examples thereof are hydroxyalkyl celluloses such as hydroxyethyl cellulose and hydroxypropyl cellulose.

Preferred examples of the cyclodextrin as the specific polymer of the component (D) include α -cyclodextrin, β -cyclodextrin, gamma-cyclodextrin and other cyclodextrins, methyl- β 0-cyclodextrin, methyl- β 1-cyclodextrin, methyl-gamma-cyclodextrin and other methylated cyclodextrins, hydroxymethyl- β 2-cyclodextrin, hydroxymethyl- β 3-cyclodextrin, hydroxymethyl-gamma-cyclodextrin, 2-hydroxyethyl- α -cyclodextrin, 2-hydroxyethyl- β -cyclodextrin, 2-hydroxyethyl-gamma-cyclodextrin, 2-hydroxypropyl- α -cyclodextrin, 2-hydroxypropyl- β -cyclodextrin, 2-hydroxypropyl-gamma-cyclodextrin, 3-hydroxypropyl- α -cyclodextrin, 3-hydroxypropyl- β -cyclodextrin, 3-hydroxypropyl-gamma-cyclodextrin, 2, 3-dihydroxypropyl- α -cyclodextrin, 2, 3-dihydroxypropyl- β -cyclodextrin, 2, 3-dihydroxypropyl-gamma-cyclodextrin, 2-dihydroxypropyl- α -cyclodextrin, 2, 3-dihydroxypropyl- β -cyclodextrin, 2-dihydroxyalkyl cyclodextrin and the like.

A melamine-formaldehyde resin, which is a preferable example of the specific polymer as the component (D), is a resin obtained by polycondensation of melamine and formaldehyde, and is represented by the following formula.

In the above formula, R²¹Represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and q is a natural number representing the number of repeating units.

The melamine-formaldehyde resin as the component (D) is preferably one in which a methylol group formed during polycondensation of melamine and formaldehyde is alkylated from the viewpoint of storage stability.

The method for obtaining the melamine formaldehyde resin as the component (D) is not particularly limited, and it can be synthesized by the following method: melamine and formaldehyde are mixed, adjusted to be alkalescent by using sodium carbonate, ammonia and the like, and then heated at 60-100 ℃. Further, the methylol group can be alkoxylated by reacting it with an alcohol.

The melamine formaldehyde resin of component (D) preferably has a weight average molecular weight of 250 to 5,000, more preferably 300 to 4,000, and still more preferably 350 to 3,500. When the weight average molecular weight is too large as higher than 5,000, the solubility in a solvent may be lowered and the handling properties may be lowered, and when the weight average molecular weight is too small as lower than 250, the curing may be insufficient at the time of thermal curing, and the effect of improving solvent resistance and heat resistance may be insufficient.

In the embodiment of the present invention, the melamine formaldehyde resin of component (D) may be used in the form of a liquid or a solution obtained by redissolving a purified liquid in a solvent described later.

As a preferable example of the specific polymer as the component (D), a phenol novolac resin is exemplified by a phenol-formaldehyde condensation polymer and the like.

In the composition for forming a cured film of the present embodiment, the polymer of component (D) may be used in the form of a powder or a solution prepared by redissolving a purified powder in a solvent described later.

The content of the component (D) in the cured film-forming composition of the present invention is preferably 400 parts by mass or less, more preferably 10 to 380 parts by mass, and still more preferably 40 to 360 parts by mass, based on 100 parts by mass of the total amount of the polymer as the component (a) and the crosslinking agent as the component (B). (D) When the content of the component is too large, the liquid crystal alignment property is liable to be lowered, and when it is too small, the adhesiveness is liable to be lowered.

In the cured film-forming composition of the present embodiment, the component (D) may be a mixture of a plurality of polymers as exemplified as the component (D).

< ingredient (E) >

The composition for forming a cured film of the present invention may further contain a crosslinking catalyst as the component (E) in addition to the components (A), (B), (C) and/or (D).

As the crosslinking catalyst as the component (E), for example, an acid or a thermal acid generator can be suitably used. The component (E) is effective for promoting the heat curing reaction of the cured film-forming composition of the present invention.

Specific examples of the acid for the component (E) include a compound having a sulfonic acid group, hydrochloric acid, and salts thereof. The thermal acid generator is not particularly limited as long as it is a compound that thermally decomposes to generate an acid during heat treatment, that is, a compound that thermally decomposes at a temperature of 80 to 250 ℃ to generate an acid.

Specific examples of the acid include hydrochloric acid or a salt thereof; sulfonic acid group-containing compounds such as methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, pentanesulfonic acid, octanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, camphorsulfonic acid, trifluoromethanesulfonic acid, p-phenolsulfonic acid, 2-naphthalenesulfonic acid, mesitylenesulfonic acid, p-xylene-2-sulfonic acid, m-xylene-2-sulfonic acid, 4-ethylbenzenesulfonic acid, 1H, 2H-perfluorooctanesulfonic acid, perfluoro (2-ethoxyethane) sulfonic acid, pentafluoroethanesulfonic acid, nonafluorobutane-1-sulfonic acid, and dodecylbenzenesulfonic acid, hydrates, and salts thereof.

Examples of the compound which generates an acid by heat include bis (tosyloxy) ethane, bis (tosyloxy) propane, bis (tosyloxy) butane, p-nitrobenzyl tosylate, o-nitrobenzyl tosylate, 1,2, 3-phenylene tris (methylsulfonate), pyridinium p-toluenesulfonate, morpholinium p-toluenesulfonate, ethyl p-toluenesulfonate, propyl p-toluenesulfonate, butyl p-toluenesulfonate, isobutyl p-toluenesulfonate, methyl p-toluenesulfonate, phenethyl p-toluenesulfonate, cyanomethyl p-toluenesulfonate, 2,2, 2-trifluoroethyl p-toluenesulfonate, 2-hydroxybutyl p-toluenesulfonate, N-ethyl-p-toluenesulfonamide, and compounds represented by the following formulae,

the content of the component (E) in the cured film-forming composition of the present invention is preferably 0.01 to 20 parts by mass, more preferably 0.1 to 15 parts by mass, and still more preferably 0.5 to 10 parts by mass, based on 100 parts by mass of the total amount of the polymer as the component (a) and the crosslinking agent as the component (B). By setting the content of the component (E) to 0.01 parts by mass or more, sufficient thermosetting properties and solvent resistance can be imparted. However, when the amount is more than 20 parts by mass, the storage stability of the composition may be lowered.

< solvent >

The composition for forming a cured film of the present invention is used mainly in the form of a solution dissolved in a solvent. The solvent used in this case is not particularly limited in kind, structure, and the like, as long as it can dissolve the component (a), the component (B), the component (C) and/or the component (D), and the component (E) and/or other additives described later, which are used as necessary.

Specific examples of the solvent include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, 2-methyl-1-butanol, n-pentanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, isobutyl methyl ketone, cyclopentanone, cyclohexanone, 2-butanone, 3-methyl-2-pentanone, 2-heptanone, γ -butyrolactone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, Ethyl ethoxyacetate, ethyl glycolate, methyl 2-hydroxy-3-methylbutyrate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, methyl pyruvate, ethyl acetate, butyl acetate, ethyl lactate, butyl lactate, cyclopentyl methyl ether, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, and the like.

When an alignment material is produced by forming a cured film on a resin film using the composition for forming a cured film of the present invention, the following solvents are preferred because they are solvents that the resin film exhibits resistance to: methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-methyl-1-butanol, 2-heptanone, isobutyl methyl ketone, diethylene glycol, propylene glycol monomethyl ether acetate, and the like.

These solvents may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

< other additives >

Further, the cured film forming composition of the present invention may contain an adhesion improver, a silane coupling agent, a surfactant, a rheology modifier, a pigment, a dye, a storage stabilizer, an antifoaming agent, an antioxidant, and the like as necessary, as long as the effects of the present invention are not impaired.

< preparation of composition for Forming cured film >

The composition for forming a cured film of the present invention contains the polymer of component (a), the crosslinking agent of component (B), the adhesion promoter of component (C), and/or the polymer having a thermally crosslinkable group of component (D), and may contain a crosslinking catalyst of component (E) if desired, and may further contain other additives as long as the effects of the present invention are not impaired. In general, they are used in the form of a solution dissolved in a solvent.

Preferred examples of the composition for forming a cured film of the present invention are as follows.

[1]: a composition for forming a cured film, comprising component (A), component (B) in an amount of 1 to 300 parts by mass based on 100 parts by mass of component (A), and at least one of component (C) in an amount of 0.1 to 100 parts by mass and component (D) in an amount of 1 to 400 parts by mass based on 100 parts by mass of the total amount of a polymer as component (A) and a crosslinking agent as component (B).

[2]: a composition for forming a cured film, comprising component (A), component (B) in an amount of 1 to 300 parts by mass based on 100 parts by mass of component (A), at least one of component (C) in an amount of 0.1 to 100 parts by mass and component (D) in an amount of 1 to 400 parts by mass based on 100 parts by mass of the total amount of a polymer as component (A) and a crosslinking agent as component (B), and a solvent.

[3]: a composition for forming a cured film, which comprises component (A), 1 to 300 parts by mass of component (B) based on 100 parts by mass of component (A), at least one of component (C) and component (D) in an amount of 0.1 to 100 parts by mass relative to 100 parts by mass of the total amount of the polymer as component (A) and the crosslinking agent as component (B), component (E) in an amount of 0.01 to 20 parts by mass relative to 100 parts by mass of the total amount of the polymer as component (A) and the crosslinking agent as component (B), and a solvent.

[4]: a composition for forming a cured film, which comprises a component (A), a component (B) in an amount of 1 to 300 parts by mass based on 100 parts by mass of the component (A), a component (C) in an amount of 0.1 to 100 parts by mass based on 100 parts by mass of the total amount of a polymer as the component (A) and a crosslinking agent as the component (B), a component (D) in an amount of 1 to 400 parts by mass based on 100 parts by mass of the total amount of the polymer as the component (A) and the crosslinking agent as the component (B), a component (E) in an amount of 0.01 to 20 parts by mass based on 100 parts by mass of the total amount of the polymer as the component (A) and the crosslinking agent as the component (B), and a solvent.

The compounding ratio, the production method and the like when the cured film-forming composition of the present invention is used in the form of a solution will be described in detail below.

The proportion of the solid component in the cured film-forming composition of the present invention is not particularly limited as long as each component is uniformly dissolved in the solvent, and is 1 to 60 mass%, preferably 2 to 50 mass%, and more preferably 2 to 20 mass%. The solid component herein refers to a component obtained by removing a solvent from all components of the cured film-forming composition.

The method for producing the cured film-forming composition of the present invention is not particularly limited. As the production method, for example, a method of mixing the component (B), the component (C) and/or the component (D), and the component (E) in a solution obtained by dissolving the component (a) in a solvent at a predetermined ratio to prepare a uniform solution; alternatively, other additives used as needed may be further added and mixed at an appropriate stage of the production method.

In the preparation of the cured film-forming composition of the present invention, a solution of a specific copolymer (polymer) obtained by polymerization in a solvent may be used as it is. In this case, for example, as described above, the component (B), the component (C), the component (D), the component (E), and the like are put into a solution of the component (a) to prepare a uniform solution. In this case, a solvent may be further additionally charged for the purpose of adjusting the concentration. In this case, the solvent used in the process of producing the component (a) may be the same as or different from the solvent used in the concentration adjustment of the cured film-forming composition.

The solution of the cured film-forming composition prepared is preferably filtered using a filter having a pore size of about 0.2 μm and then used.

< cured film, alignment material and phase difference material >

The cured film can be formed by applying a solution of the composition for forming a cured film of the present invention to a substrate (for example, a silicon/silica-coated substrate, a silicon nitride substrate, a substrate coated with a metal such as aluminum, molybdenum, chromium, or the like, a glass substrate, a quartz substrate, an ITO substrate, or the like), a film substrate (for example, a resin film such as a Triacetylcellulose (TAC) film, a Polycarbonate (PC) film, a cycloolefin polymer (COP) film, a cycloolefin copolymer (COC) film, a polyethylene terephthalate (PET) film, an acrylic film, a polyethylene film, or the like) by bar coating, spin coating, flow coating, roll coating, slit coating, spin coating followed by slit coating, ink jet coating, printing, or the like, to form a coating film, and then, drying by heating with a hot plate, an oven, or the like. The cured film can be directly applied as an alignment material.

The conditions for the heat drying may be such that the crosslinking reaction by the crosslinking agent is carried out to such an extent that the component of the cured film (alignment material) is not eluted into the polymerizable liquid crystal solution applied thereon, and for example, a heating temperature and a heating time appropriately selected from the range of 60 to 200 ℃ and a time of 0.4 to 60 minutes may be used. The heating temperature and the heating time are preferably 70 to 160 ℃ and 0.5 to 10 minutes.

The thickness of the cured film (alignment material) formed using the curable composition of the present invention is, for example, 0.05 μm to 5 μm, and can be appropriately selected in consideration of the difference in height of the substrate to be used, optical properties, and electrical properties.

Since the alignment material formed of the cured film composition of the present invention has solvent resistance and heat resistance, a retardation material such as a polymerizable liquid crystal solution having vertical alignment properties can be coated on the alignment material to align the alignment material. Further, by directly curing the retardation material in the aligned state, the retardation material can be formed as a layer having optical anisotropy. Further, when the substrate on which the alignment material is formed is a film, it is useful as a retardation film.

Further, a liquid crystal display element in which liquid crystal is aligned can be also produced by using 2 substrates having the alignment material of the present invention formed as described above, bonding the substrates with the alignment material facing each other via a spacer, and then injecting liquid crystal between the substrates.

Thus, the composition for forming a cured film of the present invention can be suitably used for production of various retardation materials (retardation films), liquid crystal display devices, and the like.

Examples

The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to these examples.

[ abbreviations used in the examples ]

The meanings of abbreviations used in the following examples are as follows.

< Polymer raw Material >

LAA: acrylic acid lauryl ester

PAA: acrylic acid palmityl ester

LAMA: lauryl methacrylate

HEMA: 2-Hydroxyethyl methacrylate

MMA: methacrylic acid methyl ester

BzMA: methacrylic acid benzyl ester

BMAA: n-butoxymethylacrylamide

GMA: glycidyl methacrylate

AIBN α' -azobisisobutyronitrile

A1: 2- (((4- (4 '-pentyl- [1, 1' -bis (cyclohexane) ] -4-yl) phenoxy) carbonylamino) ethyl methacrylate

A2: methacrylic acid 6- (4- (4-heptylcyclohexyl) phenoxy) hexyl ester

< ingredient (B) >

HMM: a melamine crosslinking agent represented by the following structural formula [ サイメル (CYMEL) (registered trademark) 303 (manufactured by Mitsui サイテック Co., Ltd.) ]

< ingredient (C) >

BMAA: n-butoxymethylacrylamide

DM-1：

< ingredient (D) >

PUA: polyurethane graft acrylic Polymer [ アクリット (registered trademark) 8UA-146 (available from Kyowa ファインケミカル Co.) ]

PCDO: polycarbonate diol [ C-590 (manufactured by KAPPA クラレ) ]

PEPO: polyester polyol Polymer (adipic acid/diethylene glycol copolymer having the following structural units. molecular weight 4,800.)

(in the formula, R represents an alkylene group.)

< ingredient (E) >

PTSA: p-toluenesulfonic acid monohydrate

< solvent >

PM: propylene glycol monomethyl ether

BA: acetic acid butyl ester

MEK: methyl ethyl ketone

CPME: cyclopentyl methyl ether

The number average molecular weight and the weight average molecular weight of the acrylic copolymer obtained in the following synthetic examples were measured using GPC devices (Shodex (registered trademark) columns KF803L and KF804L) manufactured by japan spectrography, under such conditions that an elution solvent tetrahydrofuran was passed through the columns at a flow rate of 1 mL/min (column temperature 40 ℃). The number average molecular weight (hereinafter referred to as Mn) and the weight average molecular weight (hereinafter referred to as Mw) described below are expressed in terms of polystyrene.

Synthesis of component (1) > < (A)

< Synthesis example 1 >

4.0g of LAA, 12.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PMs, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25% by mass) (PA 1). The obtained acrylic copolymer had Mn of 12,000 and Mw of 26,000.

< Synthesis example 2 >

4.0g of PAA, 12.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PMs, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25 mass%) (PA 2). The obtained acrylic copolymer had Mn of 6,000 and Mw of 12,000.

< Synthesis example 3>

4.0g of LAMA, 12.0g of MMA, 4.0g of HEMA, and 0.3g of AIBNP as a polymerization catalyst were dissolved in 60.9g of PMs, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25% by mass) (PA 3). The obtained acrylic copolymer had Mn of 14,000 and Mw of 31,000.

< Synthesis example 4 >

A solution (solid content concentration: 25% by mass) of an acrylic copolymer (PA4) was obtained by dissolving LAA (4.0 g), BzMA (12.0 g), HEMA (4.0 g) and AIBN (0.3 g) as a polymerization catalyst in PM60.9g and reacting at 80 ℃ for 20 hours. The obtained acrylic copolymer had Mn of 10,000 and Mw of 24,000.

< Synthesis example 5 >

2.0g of LAA, 14.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PMs, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25% by mass) (PA 5). The obtained acrylic copolymer had Mn of 12,000 and Mw of 27,000.

< Synthesis example 6 >

6.0g of LAA, 10.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PMs, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25% by mass) (PA 6). The obtained acrylic copolymer had Mn of 14,000 and Mw of 31,000.

Synthesis of component (B)

< Synthesis example 7 >

100.0g of BMAA and 4.2g of AIBN as a polymerization catalyst were dissolved in 193.5g of PM, and a reaction was carried out at 90 ℃ for 20 hours to obtain an acrylic polymer solution (solid content concentration: 35% by mass) (PB 1). The obtained acrylic copolymer had Mn of 2,700 and Mw of 3,900.

Synthesis of component (C)

< Synthesis example 8 >

An acrylic copolymer solution was obtained by dissolving 32.0g of BMAA, 8.0g of GMA, and 0.8g of AIBN as a polymerization catalyst in 204.0g of tetrahydrofuran and reacting at 60 ℃ for 20 hours. The acrylic copolymer solution was gradually dropped into 1000.0g of hexane to precipitate a solid, and the solid was filtered and dried under reduced pressure to obtain an acrylic copolymer (PC 1). The obtained acrylic copolymer had Mn of 7,000 and Mw of 18,000.

< synthetic example 9 >

10.0g of the acrylic copolymer (PC1) obtained in Synthesis example 8, 2.2g of acrylic acid, 0.2g of dibutylhydroxytoluene, and 10mg of benzyltriethylammonium chloride as a reaction catalyst were dissolved in PM60g, and reacted at 90 ℃ for 20 hours. This solution was gradually added dropwise to 500g of hexane to precipitate a solid, which was then filtered and dried under reduced pressure to obtain an acrylic copolymer having an acryloyl group (PC 2). To carry out¹H-NMR analysis confirmed that the acrylic copolymer (PC2) had an acryloyl group.

PC2 also functions as component B in the present invention.

< Synthesis of Compound example 1 > Synthesis of Compound [ DM-1]

A2L four-necked flask was charged with 500g of ethyl acetate, 35.5g (0.300mol) of 1, 6-hexanediol, 1.80g (11.8mmol) of 1, 8-diazabicyclo [5.4.0] -7-undecene (DBU), 0.45g (2.04mmol) of 2, 6-di-t-butyl-p-cresol (BHT) at room temperature under a stream of nitrogen gas, and heated to 55 ℃ with stirring by a magnetic stirrer. After 95.9g (0.679mol) of 2-isocyanatoethyl acrylate was added dropwise to the reaction mixture and stirred for 2 hours, the reaction mixture was analyzed by high performance liquid chromatography, and the reaction was terminated when the intermediate was 1% or less in area percentage. 328g of hexane was added thereto, and after cooling to room temperature, the precipitated solid was washed 2 times with 229g of hexane and dried to obtain compound [ A-a ] (104g, 0.260mol, yield 86.7%).

A2L four-necked flask was charged with 1330g of methylene chloride and the compound [ A-a ] under a nitrogen gas flow]100g (0.250mol) and 22.5g (0.749mol) of paraformaldehyde are added dropwise with 122g (1.12mol) of trimethylchlorosilane in an ice bath. After stirring for 2 hours, a mixture of 63.2g (0.625mol) of triethylamine and 240g of methanol was added dropwise. After stirring for 30 minutes, the mixture was transferred to a 5L separatory funnel, and 1500g of water was added thereto to conduct a separatory operation. The obtained organic layer was dried over magnesium sulfate, and the filtrate obtained by removing magnesium sulfate by filtration was concentrated and dried to obtain compound [ DM-1]](110g, 0.226mol, yield 90.3%). By using¹The following spectral data were obtained by H-NMR analysis, confirming that the compound [ DM-1]]The structure of (1).

¹H-NMR(CDCl₃)：δ6.42(d，2H J＝17.2)，6.17-6.08(m，2H)，5.86(d，2H J＝10.0)，4.77(d，4H J＝19.6)，4.30(m，4H)，4.12(t，4H J＝6.4)，3.61(m，4H)，3.30(d，6H J＝12.8)，1.67(m，4H)，1.40(m，4H).

Synthesis of component (D)

< synthetic example 10 >

MMA (100.0 g), HEMA (11.1 g), and AIBN (5.6 g) as a polymerization catalyst were dissolved in PM (450.0 g), and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 20 mass%) (PD 1). The obtained acrylic copolymer had Mn of 4,200 and Mw of 7,600.

Synthesis of component (2) < (A)

< Synthesis example 11 >

14.0g of A14, 12.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PM, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25 mass%) (PA 7). The obtained acrylic copolymer had Mn of 12,000 and Mw of 23,000.

< Synthesis example 12 >

24.0 g of A24, 12.0g of MMA, 4.0g of HEMA, and 0.3g of AIBN as a polymerization catalyst were dissolved in 60.9g of PM, and a reaction was carried out at 80 ℃ for 20 hours to obtain an acrylic copolymer solution (solid content concentration: 25 mass%) (PA 8). The obtained acrylic copolymer had Mn of 15,000 and Mw of 29,000.

< synthetic example 13 >

13.8g of MAA, 14.1g of LAA, 7.2g of HEMA, and 0.68g of AIBNN as a polymerization catalyst were dissolved in 107.0g of PMs, and a reaction was carried out at 80 ℃ for 16 hours to obtain an acrylic copolymer solution (solid content concentration: 25% by mass) (PA 9). The obtained acrylic copolymer had Mn of 13,300 and Mw of 27,800.

< formation of substrate film >

The acrylic film used as the substrate can be produced, for example, by the following method. That is, raw material pellets comprising a copolymer containing methyl methacrylate as a main component and the like were melted at 250 ℃ by an extruder, passed through a T die, and passed through a casting roll, a drying roll and the like to form an acrylic film having a thickness of 40 μm.

< examples, comparative examples >

The cured film-forming compositions of examples and comparative examples were prepared in the compositions shown in table 1. The amounts of components (a) to (E) in table 1 are all calculated as solid components (when obtained as a solution during production, the solvent is removed). Next, cured films were formed using the respective compositions for forming a retardation material, and the vertical alignment property and the adhesion property were evaluated for each of the obtained cured films.

[ Table 1]

TABLE 1

[ evaluation of vertical orientation ]

< example 1, comparative example 1 >

The surface of the substrate shown in Table 2 was subjected to UV ozone treatment for 5 minutes using a UV ozone treatment apparatus (UV-312) manufactured by テクノビジョン. The cured film-forming compositions of example 1 and comparative example 1 were applied to the substrate by a bar coater in a wet film thickness of 4 μm. Then, the substrates were heated and dried in a thermal circulation type oven at a temperature of 110 ℃ for 60 seconds, respectively, to form cured films on the substrates, respectively.

The cured film was coated with メルク (manufactured by Koka) polymerizable liquid crystal solution RMS03-015 in a wet film thickness of 6 μm by a bar coater. At 600mJ/cm²The coating film on the substrate was exposed to light to prepare a retardation material.

For these retardation materials thus produced, incident angle dependence of in-plane retardation was measured using a retardation measuring device RETS100 manufactured by tsukamur electronics corporation. A retardation material having an in-plane retardation value of 0 at an incident angle of 0 degrees and an in-plane retardation value of 38. + -.5 nm at an incident angle of. + -.50 degrees was determined to be vertically aligned. The evaluation results are summarized in "vertical alignment property" in table 2 below.

< examples 2 to 18, comparative examples 2 to 5 >

Evaluation was performed under the same conditions as in example 1 described above, except that no UV ozone treatment was performed. The evaluation results of examples 2 to 17 and comparative examples 2 and 3 are shown in "vertical alignment" in table 2, and the evaluation results of example 18 and comparative examples 4 and 5 are shown in table 3.

[ evaluation of adhesion ]

< example 1, comparative example 1 >

The surface of the substrate shown in Table 2 was subjected to UV ozone treatment for 5 minutes using a UV ozone treatment apparatus (UV-312) manufactured by テクノビジョン. Each of the cured film-forming compositions of examples and comparative examples was applied to the substrate with a wet film thickness of 4 μm by a bar coater. Then, the substrates were heated and dried in a thermal circulation type oven at a temperature of 110 ℃ for 60 seconds, respectively, to form cured films on the substrates, respectively.

The phase difference material was cut into cuts at 1mm intervals in the vertical and horizontal directions so as to form 5 cells × 5 cells, a transparent tape (scotch tape) peeling test was performed on the cuts, and the case where all of the 25 cells remained without peeling was designated as ○ and the case where all of the cells were peeled was designated as x for evaluation, and the evaluation results were summarized as "adhesion" in table 2 below.

< examples 2 to 17 and comparative examples 2 to 3>

Evaluation was performed under the same conditions as in example 1 described above, except that no UV ozone treatment was performed. The evaluation results are summarized in "adhesiveness" in table 2 below.

[ Table 2]

TABLE 2

	Vertical orientation	Adhesion Property	Base material	UV ozone treatment
					Example 1	○	○	PC	Is provided with
Example 2	○	○	PC	Is free of
					Example 3	○	○	PC	Is free of
Example 4	○	○	PC	Is free of
					Example 5	○	○	PC	Is free of
Example 6	○	○	PC	Is free of
					Example 7	○	○	PC	Is free of
Example 8	○	○	PC	Is free of
					Example 9	○	○	PC	Is free of
Example 10	○	○	PC	Is free of
					Example 11	○	○	Acrylic acid series	Is free of
Example 12	○	○	TAC	Is free of
					Example 13	○	○	PC	Is free of
Example 14	○	○	PC	Is free of
					Example 15	○	○	PC	Is free of
Example 16	○	○	PC	Is free of
					Example 17	○	○	PC	Is free of
Comparative example 1	○	×	PC	Is provided with
					Comparative example 2	○	×	PC	Is free of
Comparative example 3	○	×	TAC	Is free of

[ Table 3]

TABLE 3

As shown in Table 2, the alignment materials obtained using the cured film-forming compositions of examples 1 to 17 exhibited good vertical alignment properties as compared with the alignment materials obtained using the cured film-forming compositions of comparative examples 1 to 3. As shown in table 3, the alignment materials obtained using the cured film-forming composition of example 18 exhibited better vertical alignment properties with respect to various substrates than the alignment materials obtained using the cured film-forming compositions of comparative examples 4 and 5.

In addition, the cured films obtained using the cured film forming compositions of examples 1 to 17 showed excellent adhesion. In contrast, it was difficult to obtain adhesion of the cured films obtained using the compositions for forming a cured film of comparative examples 1 to 3.

Industrial applicability

The composition for forming a cured film of the present invention is useful as a material for forming an alignment material for forming a liquid crystal alignment film of a liquid crystal display device and an optically anisotropic film provided inside or outside the liquid crystal display device, and is particularly suitable as a material for an optically compensatory film for IPS-LCD.

Claims

1. A composition for forming a cured film, characterized in that,

comprises the following components:

(B) a crosslinking agent, and

the vertical orientation group is a group derived from an alkyl ester of acrylic acid, an alkyl ester of methacrylic acid, an alkyl vinyl ether, 2-alkylstyrene, 3-alkylstyrene, 4-alkylstyrene, and N-alkylmaleimide, wherein the alkyl group is a long chain alkyl group having 6 to 20 carbon atoms.

2. The cured film-forming composition according to claim 1, wherein the functional group capable of thermal crosslinking of component (A) is a hydroxyl group, a carboxyl group, an amino group or an alkoxysilyl group.

3. The cured film-forming composition according to claim 1 or 2, wherein the crosslinking agent of component (B) is a crosslinking agent having a methylol group or an alkoxymethyl group.

4. The cured film-forming composition according to claim 1 or 2, further comprising (E) a crosslinking catalyst.

5. The cured film-forming composition according to claim 1 or 2, wherein the component (B) is contained in an amount of 1 to 300 parts by mass based on 100 parts by mass of the component (A).

6. The composition for forming a cured film according to claim 1 or 2, wherein either one or both of component (C) and component (D) are contained in an amount of 0.1 to 100 parts by mass based on 100 parts by mass of the total amount of the polymer as component (A) and the crosslinking agent as component (B).

7. The composition for forming a cured film according to claim 4, wherein the component (E) is contained in an amount of 0.01 to 20 parts by mass based on 100 parts by mass of the total amount of the polymer as the component (A) and the crosslinking agent as the component (B).

8. An alignment material obtained by curing the composition for forming a cured film according to any one of claims 1 to 7.

9. A phase difference material, which is formed by using a cured film obtained from the composition for forming a cured film according to any one of claims 1 to 7.