TW201341429A - Liquid crystal aligning agent, liquid crystal alignment membrane, liquid crystal display element, and method for manufacturing liquid crystal display element - Google Patents

Abstract

Provided is a liquid crystal aligning agent comprising a constituent (A), a constituent (B), and a constituent (C), detailed below, as well as an organic solvent. Constituent (A) is at least one polymer chosen from the following: a polyimide precursor with a side chain that aligns liquid crystal vertically and a photoreactive side chain comprising at least one chosen from the group consisting of a methacryl group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamoyl group; and a polyimide obtained through imidization of this polyimide precursor. Constituent (B) is a polymerizable compound with a photopolymerized or photocrosslinked group on at least one terminal. Constituent (C) is at least one polymer chosen from the following: a polyimide precursor obtained through the reaction of a tetracarboxylic dianhydride with a diamine with a photoreactive side chain comprising at least one chosen from the group consisting of a methacryl group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamoyl group, and at least one diamine selected from the formulas (C-1)-(C-5) shown in the figure; and a polyimide obtained through imidization of this polyimide precursor. (In the formulas, Y1 represents a secondary amine, a tertiary amine, or a monovalent organic group with a heterocyclic structure, while Y2 represents a secondary amine, a tertiary amine, or a divalent organic group with a heterocyclic structure.)

Description

Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element, and manufacturing method of liquid crystal display element

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film, a liquid crystal display element, and a liquid crystal display element manufacturing method of a liquid crystal display device of a vertical alignment type which can be used to irradiate ultraviolet rays in a state in which a voltage is applied to liquid crystal molecules. .

In a liquid crystal display device in which liquid crystal molecules vertically aligned with a substrate are responsive to an electric field (also referred to as a vertical alignment (VA) method), in the manufacturing process, ultraviolet rays are applied while applying voltage to liquid crystal molecules. The stepper.

In the liquid crystal display device of the above-described vertical alignment type, it is known that a photopolymerizable compound is added to the liquid crystal composition in advance, and a vertical alignment film such as polyimide or the like is used to apply a voltage to the liquid crystal cell. Ultraviolet rays are used to accelerate the response speed of liquid crystals (for example, refer to Patent Document 1 and Non-Patent Document 1) (PSA (Polymer Sustained Alignment) type liquid crystal display). It is generally known that the tilt direction of the liquid crystal molecules responsive to the electric field can be controlled by a protrusion provided on the substrate or a slit provided in the display electrode, but a photopolymerizable compound is added to the liquid crystal composition and The liquid crystal cell is irradiated with ultraviolet light while applying a voltage, and the polymer structure in which the oblique direction of the liquid crystal molecules is stored can be formed on the liquid crystal alignment film, and the tilt direction of the liquid crystal molecules is controlled by the protrusion or the slit only. In this way, the response speed of the liquid crystal display element becomes faster.

In the PSA liquid crystal display device, there is a problem that the solubility of the polymerizable compound added to the liquid crystal is low, and the amount of addition increases at a low temperature. On the other hand, when the addition amount of a polymeric compound is reduced, a favorable alignment state cannot be obtained. Further, the unreacted polymerizable compound remaining in the liquid crystal causes an impurity (contamination) in the liquid crystal to cause a problem that the reliability of the liquid crystal display element is lowered. Further, in the case of the UV irradiation treatment required in the PSA mode, if the amount of irradiation is large, the components in the liquid crystal are decomposed, resulting in a decrease in reliability.

Here, it has been reported that by adding a photopolymerizable compound to a liquid crystal alignment film instead of being added to a liquid crystal composition, the response speed of the liquid crystal display element becomes faster (SC-PVA type liquid crystal display) (for example, reference) Non-patent document 2).

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-307720

[Non-patent literature]

[Non-Patent Document 1] K. Hanaoka, SID 04 DIGEST, P.1200-1202

[Non-Patent Document 2] K.H Y.-J.Lee, SID 09 DIGEST, P.666-668

However, it is desirable to make the response speed of the liquid crystal display element more variable. fast. In addition, it is considered that the reaction rate of the liquid crystal display element can be accelerated by increasing the amount of the photopolymerizable compound to be added. However, if the photopolymerizable compound is left unreacted in the liquid crystal and remains as an impurity, it becomes a liquid crystal display element. Since the reliability is lowered, a polymerizable compound capable of accelerating the response speed with a small amount of addition is expected.

Further, it is also desired that the obtained liquid crystal display element has good electrical characteristics, and in particular, it has excellent DC charge storage characteristics.

An object of the present invention is to provide a solution to the above-mentioned problems of the prior art, and to improve the response speed of a liquid crystal display element of a vertical alignment type, and further, to obtain electrical characteristics of the liquid crystal display element, in particular, DC charge accumulation. A liquid crystal alignment agent, a liquid crystal alignment film, a liquid crystal display element, and a method of producing a liquid crystal display element having improved properties.

In order to solve the above-mentioned problems, the inventors have repeatedly conducted a review on the results, and found that the side chain having the liquid crystal is vertically aligned and contains a methacrylic acid group, an acrylic group, a vinyl group, an allyl group, and a couma bean. Selectively selected at least one photoreactive side chain polyimine precursor selected from the group consisting of a mercapto group, a styryl group and a cinnamyl group, and a polyimine obtained by imidating the polyimine precursor In the polymer, a polyimine precursor prepared from a diamine having a photoreactive side chain and a diamine having a predetermined structure as a raw material, and an imidization of the polyamidene precursor ruthenium are obtained by blending The polymer selected from the polyimine can solve the above problems and complete the present invention.

That is, the present invention has the following gist.

A liquid crystal alignment agent comprising the following components (A), (B), (C), and an organic solvent.

(A) component: at least a side chain having a liquid crystal in a vertical alignment and at least a selected from a methacrylic group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group. A polyimine precursor of a photoreactive side chain, and at least one polymer selected from the polyimine obtained by imidating the polyimine precursor.

Component (B): a polymerizable compound having a photopolymerization or photocrosslinking group at one or more terminals.

(C) component: consisting of having a photoreactive side chain having at least one selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group. a polyamine, a polyimine precursor obtained by reacting at least one diamine selected from the following formulas (C-1) to (C-5), and a tetracarboxylic dianhydride, and the polybenzazole The imine precursor is at least one polymer selected from the polyimine obtained by imidization.

(wherein Y ₁ represents a secondary amine, a tertiary amine, or an organic group having a monovalent structure of a heterocyclic structure, Y ₂ represents a secondary amine, a tertiary amine, or a divalent organic group having a heterocyclic structure. )

2. The liquid crystal alignment agent according to 1, wherein the photoreactive side chain system comprises a group selected from the following formula (I).

(wherein R ¹¹ is H or methyl.)

3. The liquid crystal alignment agent according to 1 or 2, wherein the photopolymerization or photocrosslinking base is selected from the following formula (II).

(wherein R ¹² is H or an alkyl group having 1 to 4 carbon atoms; and Z ¹ is a divalent aromatic ring or a hetero group substituted by an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms; The ring, Z ² system may be a monovalent aromatic ring or a heterocyclic ring substituted with an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms.

4. The liquid crystal alignment agent according to any one of 1 to 3, wherein the component (C) is a formula of 10 mol% to 80 mol% of the total diamine component using the raw material of the component (C). a polyimine precursor obtained from a diamine selected from C-1) to (C-5), and an imidization of the polyamidene precursor ruthenium Polyethylenimine-selected polymer.

A liquid crystal alignment film characterized in that the liquid crystal alignment agent according to any one of 1 to 4 is applied onto a substrate and fired.

A liquid crystal display device comprising a liquid crystal cell, wherein the liquid crystal cell is brought into contact with a liquid crystal alignment film obtained by applying a liquid crystal alignment agent according to any one of 1 to 4 to a substrate and baking the liquid crystal alignment film. A liquid crystal cell is prepared by irradiating ultraviolet rays by applying a voltage to the liquid crystal layer.

A method for producing a liquid crystal display device, characterized in that a liquid crystal layer is provided in contact with a liquid crystal alignment film obtained by applying a liquid crystal alignment agent according to any one of 1 to 4 to a substrate, and firing the liquid crystal alignment film. The layer is applied with a voltage while irradiating ultraviolet rays to form a liquid crystal cell.

According to the present invention, it is possible to provide a liquid crystal display element of a vertical alignment type in which the response speed of the liquid crystal is fast and the accumulation of DC charges is small. Further, in the liquid crystal alignment agent, even when the amount of the polymerizable compound added is small, the response speed can be sufficiently increased.

[Formation for implementing the invention]

Hereinafter, the present invention will be described in detail.

The liquid crystal alignment agent of the present invention contains the liquid crystal alignment agent of the above (A) component, (B) component, (C) component, and an organic solvent. Further, the liquid crystal alignment agent is a solution for producing a liquid crystal alignment film, so-called liquid crystal alignment. The film has a liquid crystal in a predetermined direction, and in the present invention, a film for alignment in the vertical direction is used. The components contained in the liquid crystal alignment agent of the present invention are described in detail below.

[(A) component]

The liquid crystal alignment agent of the present invention contains, in the component (A), a side chain having a liquid crystal perpendicularly aligned and containing a methacryl group, an acrylic group, a vinyl group, an allyl group, a coumarin group, and a benzene group. Polymerization of at least one photoreactive side chain polyimine precursor selected from a vinyl group and a cinnamyl group, and at least one selected from the polyamidene obtained by imidating the polyimine precursor quinone Things. Further, examples of the polyimine precursor include polyamic acid, polyamic acid, and polyglycolate.

<Make the liquid crystal into a side chain of vertical alignment>

The side chain in which the liquid crystal is vertically aligned is not limited as long as it is a structure in which the liquid crystal can be vertically aligned with the substrate. For example, a long-chain alkyl group or a long-chain alkyl group may have a ring structure or a branch. The structural group, the aliphatic alcohol group, or a part or all of the hydrogen atom of the group is substituted with a group of a fluorine atom or the like. The liquid crystal may be vertically aligned to the side chain, and may be directly bonded to a polyimine precursor such as polylysine or a main chain of polyimine, or may be bonded via a suitable bonding group. The side chain of the liquid crystal in the vertical alignment may be, for example, the following formula (a).

(In the formula (a), l, m and n each independently represent an integer of 0 or 1, and R ³ represents an alkylene group having 2 to 6 carbon atoms, -O-, -COO-, -OCO-, -NHCO-, -CONH-, or a C 1~3 alkyl-ether group, R ⁴ , R ⁵ and R ⁶ each independently represent a phenyl or cycloalkyl group, R ⁷ represents a hydrogen atom, and the carbon number is 2-24. An alkyl or fluoroalkyl group, a monovalent aromatic ring, a monovalent aliphatic ring, a monovalent heterocyclic ring, or such a monovalent large cyclic substituent.

Further, R ³ in the above formula (a) is preferably an alkyl-ether group having -O-, -COO-, -CONH-, or a carbon number of 1 to 3 from the viewpoint of easiness of synthesis. .

Further, R ⁴ , R ⁵ and R ⁶ in the formula (a) are 1, m, n, and R ⁴ shown in Table 1 below, from the viewpoints of easiness of synthesis and ability to vertically align the liquid crystal. A combination of R ⁵ and R ⁶ is preferred.

Further, when at least one of l, m and n is 1, R ⁷ in the formula (a) is preferably a hydrogen atom or an alkyl group having 2 to 14 carbon atoms or a fluorine-containing alkyl group, more preferably a hydrogen atom or carbon. A number of 2 to 12 alkyl or fluoroalkyl groups. Further, when l, m, and n are simultaneously 0, R ^{7 is} preferably an alkyl group having 12 to 22 carbon atoms or a fluorine-containing alkyl group, a monovalent aromatic ring, a monovalent aliphatic ring, and a monovalent heterocyclic ring. These monovalent large cyclic substituents are more preferably an alkyl group having 12 to 20 carbon atoms or a fluorine-containing alkyl group.

The amount of the side chain in which the liquid crystal is vertically aligned is not particularly limited as long as the liquid crystal alignment film allows the liquid crystal to be vertically aligned. In the liquid crystal display device including the liquid crystal alignment film, the amount of the side chain in which the liquid crystal is vertically aligned is as large as possible within a range that does not impair the display characteristics of the device such as the voltage holding ratio or the accumulation of the residual DC voltage. The less is better.

In addition, a polymer having a side chain for vertically aligning the liquid crystal, the ability of the liquid crystal to be vertically aligned may vary depending on the structure of the side chain in which the liquid crystal is vertically aligned. Generally, the liquid crystal is vertically aligned. If the amount is increased, the ability to make the liquid crystal vertically aligned will increase, and if it decreases, it will decrease. Further, if it has a ring-shaped structure, it has a tendency to make the liquid crystal perpendicularly aligned as compared with a case where it does not have a ring-shaped structure.

<Photoreactive side chain>

The photoreactive side chain is reacted by irradiation of ultraviolet rays and has a functional group capable of forming a covalent bond (hereinafter also referred to as a photoreactive group). The side chain, in the present invention, the photoreactive group aspect contains at least one selected from the group consisting of methacrylic acid group, acrylic group, vinyl group, allyl group, coumarin group, styryl group and cinnamyl group. Thus, a polymer comprising at least one of a polyimine precursor and a polyimine contained in a liquid crystal alignment agent has a methacrylic acid group, an acrylic group, a vinyl group, an allyl group, and a couma bean. At least one photoreactive side chain selected from the group consisting of a mercapto group, a styryl group, and a cinnamyl group, and used in a liquid crystal alignment agent together with the component (B) as a polymerizable compound, as in the embodiment described later The response speed is significantly improved as shown.

The photoreactive side chain may also be directly bonded to the main chain of the polyimine precursor or the polyimide, or may be bonded via a suitable bonding group. The side chain of photoreactivity may, for example, be represented by the following formula (b).

[化5]-R ⁸ -R ⁹ -R ¹⁰    (b)

(In the formula (b), R ⁸ represents a single bond or -CH ₂ -, -O-, -COO-, -OCO-, -NHCO-, -CONH-, -NH-, -CH ₂ O-, -N Any of (CH ₃ )-, -CON(CH ₃ )-, -N(CH ₃ )CO-, R ⁹ represents a single bond, or an alkyl group having an unsubstituted or substituted fluorine atom and having a carbon number of 1 to 20 The alkyl-CH ₂ - group may be optionally substituted with -CF ₂ - or -CH=CH-, and may be substituted for any of the groups exemplified below. ;-O-, -COO-, -OCO-, -NHCO-, -CONH-, -NH-, a divalent carbocyclic ring, a divalent heterocyclic ring. R ¹⁰ represents a methacrylic acid group, an acrylic group, a vinyl group , allyl, coumarin, styryl and cinnamyl.)

Further, although R ⁸ in the above formula (b) can be formed by a general organic synthesis method, from the viewpoint of easiness of synthesis, -CH ₂ -, -O-, -COO-, -NHCO are used. -, -NH-, -CH ₂ O- is preferred.

Further, in terms of a carbon ring or a heterocyclic ring of a divalent carbocyclic ring or a divalent heterocyclic ring of any of -CH ₂ -, which is substituted for R ⁹ , specifically, the following structures are mentioned, but are not limited thereto. .

From the viewpoint of photoreactivity, R ¹⁰ is preferably a methacrylic group, an acrylic group or a vinyl group.

Further, the above formula (b) is more preferably a structure containing a group selected from the above formula (I).

The amount of the side chain of the photoreactivity is preferably such that it is caused by the irradiation of ultraviolet rays, and the range of the response speed of the liquid crystal is accelerated by the formation of a covalent bond, so that the response speed of the liquid crystal is faster and does not affect. Under the scope of other characteristics, it is better to have as many as possible.

<Method for Producing (A) Component>

Thus having at least one photoreactive species selected from the side chains of the liquid crystal in a vertical alignment and containing a methacrylic acid group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group. a method for producing the component (A) by using a side chain polyimine precursor and at least one polymer (A) selected from the polyimine obtained by imidating the polyimine precursor quinone There is no particular limitation. For example, in the method of obtaining a polyamic acid by a reaction of a diamine and a tetracarboxylic dianhydride, the following components are copolymerized: a diamine having a side chain in which the liquid crystal is vertically aligned Or a tetracarboxylic dianhydride having a side chain that vertically aligns the liquid crystal, or having a methacrylic acid group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group. At least one photoreactive side chain diamine or having a photoreaction comprising at least one selected from the group consisting of methacrylic acid, acrylic acid, vinyl, allyl, coumarinyl, styryl, and cinnamyl Side chain tetracarboxylic dianhydride.

The diamine having a side chain in which the liquid crystal is vertically aligned may be a group having a ring structure or a branchable structure in the middle of a long-chain alkyl group or a long-chain alkyl group, or may have a One or all of the hydrogen atoms of these groups are partially or completely substituted with a diamine of a side of a fluorine atom, for example, a diamine having a side chain represented by the above formula (a). More specifically, for example, diamines represented by the following formulas (2), (3), (4), and (5) are exemplified, but are not limited thereto.

(The definitions of l, m, n, and R ³ to R ^{7 in} the formula (2) are the same as those in the above formula (a).)

(In the formulas (3) and (4), A ₁₀ represents -COO-, -OCO-, -CONH-, -NHCO-, -CH ₂ -, -O-, -CO-, or -NH-, A ₁₁ is a single bond or a phenyl group, a represents the same structure as the side chain in which the liquid crystal is vertically aligned as shown in the above formula (a), and a' represents a side perpendicular to the liquid crystal shown in the above formula (a). The same structure of the chain removes the divalent base of the structure of an element such as hydrogen.)

(In the formula (5), A ₁₄ is an alkyl group having 3 to 20 carbon atoms which may be substituted by a fluorine atom, an A ₁₅ group, a 1,4 cyclohexyl group or a 1,4-phenylene group, an A _{16 type} oxygen atom or a -COO group. -* (only, the key bond with "*" is bonded to A ₁₅ ), A ₁₇ oxygen atom or -COO-* (only, the bond key with "*" is (CH ₂ )a ₂ In addition, A ₁ is an integer of 0 or 1 , an integer of 2 to 10 of A ₂ , an integer of A ₃ , or an integer of 1.

The bonding position of the two amine groups (-NH ₂ ) in the formula (2) is not limited. Specifically, the bonding group of the side chain may be a position of 2, 3 on the benzene ring, a position of 2, 4, a position of 2, 5, a position of 2, 6, a position of 3, 4, 3,5 position. Among them, from the viewpoint of reactivity in synthesizing polyamic acid, the position of 2, 4, 2, 5 or 3, 5 is preferred. Further, when the ease of synthesizing the diamine is further added, the position of 2, 4 or the position of 3, 5 is more preferable.

In the specific structure of the formula (2), the diamines represented by the following formulas [A-1] to [A-24] can be exemplified, but are not limited thereto.

(In the formula [A-1] to the formula [A-5], A ₁ is an alkyl group having 2 to 24 carbon atoms or a fluorine-containing alkyl group. 〕

(In the formula [A-6] and the formula [A-7], A ₂ represents -O-, -OCH ₂ -, -CH ₂ O-, -COOCH ₂ -, or -CH ₂ OCO-, and A ₃ is carbon. a number of 1 to 22 alkyl, alkoxy, fluoroalkyl or fluoroalkoxy.)

(In the formula [A-8] to the formula [A-10], A ₄ represents -COO-, -OCO-, -CONH-, -NHCO-, -COOCH ₂ -, -CH ₂ OCO-, -CH ₂ O -, -OCH ₂ -, or -CH ₂ -, A ₅ is an alkyl group having 1 to 22 carbon atoms, an alkoxy group, a fluorine-containing alkyl group or a fluorine-containing alkoxy group. 〕

(In the formula [A-11] and the formula [A-12], A ₆ represents -COO-, -OCO-, -CONH-, -NHCO-, -COOCH ₂ -, -CH ₂ OCO-, -CH ₂ O -, -OCH ₂ -, -CH ₂ -, -O-, or -NH-, A ₇ is a fluoro group, a cyano group, a trifluoromethyl group, a nitro group, an azo group, a methyl group, an ethyl group, Ethoxylated, or hydroxy.)

(In the formula [A-13] and the formula [A-14], A ₈ is an alkyl group having 3 to 12 carbon atoms, and the cis-trans isomers of the 1,4-cyclohexylene group are each a trans isomer . 〕

(In the formula [A-15] and the formula [A-16], A ₉ is an alkyl group having 3 to 12 carbon atoms, and the cis-trans isomers of the 1,4-cyclohexylene group are each a trans isomer . 〕

Specific examples of the diamine represented by the formula (3) include the diamines represented by the following formulas [A-25] to [A-30], but are not limited thereto.

(In the formula [A-25] to the formula [A-30], A ₁₂ represents -COO-, -OCO-, -CONH-, -NHCO-, -CH ₂ -, -O-, -CO-, or - NH- and A ₁₃ represent an alkyl group having 1 to 22 carbon atoms or a fluorine-containing alkyl group. )

Specific examples of the diamine represented by the formula (4) include the diamines represented by the following formula [A-31] to the formula [A-32], but are not limited thereto.

Among them, the ability to align the liquid crystal vertically is from [A-1], [A-2], [A-3], [A-4], [A-5] from the viewpoint of the response speed of the liquid crystal. Preferably, the diamines of [A-25], [A-26], [A-27], [A-28], [A-29], and [A-30] are preferred.

The above-mentioned diamine is used in the form of a liquid crystal alignment, a pretilt angle, a voltage holding property, and an accumulated charge in the case of the liquid crystal alignment film, and may be used alone or in combination of two or more.

The diamine having a side chain in which the liquid crystal is vertically aligned is a perdiamine component for use in the synthesis of the (A) component of the polyamidamine precursor or poly (imine). The amount of 5 to 50 mol% is preferably, more preferably 10 to 40 mol% of the total diamine component, and the diamine having a side chain which makes the liquid crystal vertically aligned, particularly preferably 15 to 30 mol%. When such a diamine having a side chain in which the liquid crystal is vertically aligned is used, it is 5 to 50 mol% of a polydiamine component for polyamine or a polydiamine component for polyamine synthesis. Quantity, in the response speed increase or liquid crystal alignment fixed energy From the point of view of strength, it is particularly excellent.

The diamine having at least one photoreactive side chain selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group, for example, a diamine of a side chain represented by formula (b). More specifically, for example, the diamine represented by the following general formula (6) can be mentioned, but it is not limited thereto.

(The definitions of R ⁸ , R ⁹ and R ¹⁰ in the formula (6) are the same as those in the above formula (b).)

The bonding position of the two amine groups (-NH ₂ ) in the formula (6) is not limited. Specifically, the bonding group of the side chain may be a position of 2, 3 on the benzene ring, a position of 2, 4, a position of 2, 5, a position of 2, 6, a position of 3, 4, 3,5 position. Among them, from the viewpoint of reactivity in synthesizing polyamic acid, it is preferably a position of 2, 4, a position of 2, 5, or a position of 3, 5. Further, when the ease of synthesizing the diamine is further added, the position of 2, 4 or the position of 3, 5 is more preferable.

a diamine having at least one photoreactive side chain selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group, specifically, The following compounds can be mentioned, but are not limited thereto.

(wherein, X-type single bond, or a bond group selected by -O-, -COO-, -NHCO-, -NH-, a Y-type single bond, or a carbon represented by an unsubstituted or fluorine atom-substituted carbon Number of 1 to 20 alkyl groups.)

The above diamine having at least one photoreactive side chain selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group, is used as a liquid crystal alignment In the film, the liquid crystal alignment property, the pretilt angle, the voltage holding property, the charge, and the like, and the response speed of the liquid crystal when the liquid crystal display element is used may be used alone or in combination of two or more.

Further, it has at least one selected from the group consisting of methacrylic acid group, acrylic group, vinyl group, allyl group, coumarin group, styryl group and cinnamyl group. The diamine of the photoreactive side chain is 10~70 mol% of the polydiamine component used in the synthesis of the polyamido acid or the polydiamine component using the (A) component. The amount is preferably, more preferably 20 to 60 mol%, particularly preferably 30 to 50 mol%.

Further, the polyimine precursor or the polyimine which is a polyamine derivative of the component (A) does not impair the effects of the present invention, except for the above-mentioned diamine having a side chain which vertically aligns the liquid crystal. Alternatively, in addition to the diamine having a photoreactive group, a diamine component which is a raw material may be used in combination with another diamine. Specifically, for example, p-phenylenediamine, 2,3,5,6-tetramethyl-p-phenylenediamine, 2,5-dimethyl-p-phenylene Amine, m-phenylenediamine, 2,4-dimethyl-m-phenylenediamine, 2,5-diaminotoluene, 2,6-diaminotoluene, 2,5-diamine Phenolic, 2,4-diaminophenol, 3,5-diaminophenol, 3,5-diaminobenzyl alcohol, 2,4-diaminobenzyl alcohol, 4,6-di Amino resorcinol, 4,4'-diaminobiphenyl, 3,3'-dimethyl-4,4'-diaminobiphenyl, 3,3'-dimethoxy-4, 4'-diaminobiphenyl, 3,3'-dihydroxy-4,4'-diaminobiphenyl, 3,3'-dicarboxy-4,4'-diaminobiphenyl, 3,3 '-Difluoro-4,4'-biphenyl, 3,3'-trifluoromethyl-4,4'-diaminobiphenyl, 3,4'-diaminobiphenyl, 3,3'- Diaminobiphenyl, 2,2'-diaminobiphenyl, 2,3'-diaminobiphenyl, 4,4'-diaminodiphenylmethane, 3,3'-diaminodi Phenylmethane, 3,4'-diaminodiphenylmethane, 2,2'-diaminodiphenylmethane, 2,3'-diaminodiphenylmethane, 4,4'-diamine Diphenyl ether, 3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl , 2,2'-diaminodiphenyl ether, 2,3'-diaminodiphenyl ether, 4,4'-sulfonyldiphenylamine, 3,3'-sulfonyldiphenylamine, double (4-aminophenyl)decane, bis(3-aminophenyl)anthracene Alkane, dimethyl-bis(4-aminophenyl)decane, dimethyl-bis(3-aminophenyl)decane, 4,4'-thiodiphenylamine, 3,3'-thiodi Aniline, 4,4'-diaminodiphenylamine, 3,3'-diaminodiphenylamine, 3,4'-diaminodiphenylamine, 2,2'-diaminodi Phenylamine, 2,3'-diaminodiphenylamine, N-methyl(4,4'-diaminodiphenyl)amine, N-methyl (3,3'-diaminodiyl) Phenyl)amine, N-methyl(3,4'-diaminodiphenyl)amine, N-methyl(2,2'-diaminodiphenyl)amine, N-methyl (2, 3'-Diaminodiphenyl)amine, 4,4'-diaminobenzophenone, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone , 1,4-diaminonaphthalene, 2,2'-diaminobenzophenone, 2,3'-diaminobenzophenone, 1,5-diaminonaphthalene, 1,6-di Amino naphthalene, 1,7-diaminonaphthalene, 1,8-diaminonaphthalene, 2,5-diaminonaphthalene, 2,6-diaminonaphthalene, 2,7-diaminonaphthalene, 2, 8-Diaminonaphthalene, 1,2-bis(4-aminophenyl)ethane, 1,2-bis(3-aminophenyl)ethane, 1,3-bis(4-aminobenzene) Propane, 1,3-bis(3-aminophenyl)propane, 1,4-bis(4-aminophenyl)butane, 1,4-bis(3-aminophenyl) Butane, bis(3,5-diethyl-4-aminophenyl)methane, 1,4-bis(4-aminophenoxy)benzene, 1,3-bis(4-aminophenoxyl) Benzene, 1,4-bis(4-aminophenyl)benzene, 1,3-bis(4-aminophenyl)benzene, 1,4-bis(4-aminobenzyl)benzene, 1,3-bis(4-aminophenoxy)benzene, 4,4'-[1,4-phenylenebis(methylene)]diphenylamine, 4,4'-[1,3-stretch Phenylbis(methylene)]diphenylamine, 3,4'-[1,4-phenylenebis(methylene)]diphenylamine, 3,4'-[1,3-phenylene double ( Methylene)]diphenylamine, 3,3'-[1,4-phenylenebis(methylene)]diphenylamine, 3,3'-[1,3-phenylene bis(methylene) Diphenylamine, 1,4-phenylene bis[(4-aminophenyl)methanone], 1,4-phenylene bis[(3-aminobenzene) Methyl ketone], 1,3-phenylene bis[(4-aminophenyl)methanone], 1,3-phenylene bis[(3-aminophenyl)methanone], 1, 4-phenylene bis(4-aminobenzoate), 1,4-phenylene bis(3-aminobenzoate), 1,3-phenylene bis(4-aminobenzene) Formate), 1,3-phenylene bis(3-aminobenzoate), bis(4-aminophenyl)terephthalate, bis(3-aminophenyl) pair Phthalate, bis(4-aminophenyl)isophthalate, bis(3-aminophenyl)isophthalate, N,N'-(1,4-phenylene) Bis(4-aminobenzamide), N,N'-(1,3-phenylene)bis(4-aminobenzamide), N,N'-(1,4- Phenyl) bis(3-aminobenzamide), N,N'-(1,3-phenylene)bis(3-aminobenzamide), N,N'-bis (4) -aminophenyl)terephthalamide, N,N'-bis(3-aminophenyl)terephthalamide, N,N'-bis(4-aminophenyl)isophthalene Dimethylamine, N,N'-bis(3-aminophenyl)m-xylyleneamine, 9,10-bis(4-aminophenyl)anthracene, 4,4'-bis(4- Aminophenoxy)diphenylphosphonium, 2,2'-bis[4-(4-aminophenoxy)phenyl]propane, 2,2'-bis[4-(4-aminophenoxyl) Phenyl]hexafluoropropane Alkane, 2,2'-bis(4-aminophenyl)hexafluoropropane, 2,2'-bis(3-aminophenyl)hexafluoropropane, 2,2'-bis(3-amino- 4-methylphenyl)hexafluoropropane, 2,2'-bis(4-aminophenyl)propane, 2,2'-bis(3-aminophenyl)propane, 2,2'-double ( 3-amino-4-methylphenyl)propane, 3,5-diaminobenzoic acid, 2,5-diaminobenzoic acid, 1,3-bis(4-aminophenoxy)propane, 1,3-bis(3-aminophenoxy)propane, 1,4-bis(4-aminophenoxy)butane, 1,4-bis(3-aminophenoxy)butane, 1,5-bis(4-aminophenoxy)pentane, 1,5-bis(3-aminophenoxy)pentane, 1,6-bis(4-aminophenoxy)hexane 1,6- Bis(3-aminophenoxy)hexane, 1,7-bis(4-aminophenoxy)heptane, 1,7-(3-aminophenoxy)heptane, 1,8- Bis(4-aminophenoxy)octane, 1,8-bis(3-aminophenoxy)octane, 1,9-bis(4-aminophenoxy)decane, 1,9 - bis(3-aminophenoxy)decane, 1,10-(4-aminophenoxydecane, 1,10-(3-aminophenoxydecane, 1,11-(4) -aminophenoxy)undecane, 1,11-(3-aminophenoxy)undecane, 1,12-(4-aminophenoxy)dodecane, 1,12-( An alicyclic group such as an aromatic diamine such as 3-aminophenoxy)dodecane, bis(4-aminocyclohexyl)methane or bis(4-amino-3-methylcyclohexyl)methane Amine, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane 1,8-Diaminooctane, 1,9-diaminodecane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diamine-10- An aliphatic diamine such as dioxane.

The above-mentioned other diamines may be used alone or in combination of two or more kinds in the liquid crystal alignment property, the pretilt angle, the voltage holding property, and the charge accumulated in the liquid crystal alignment film.

The tetracarboxylic dianhydride component which reacts with the above-described diamine component in the synthesis of polyamine or the like as the component (A) is not particularly limited. Specific examples thereof include pyromellitic acid, 2,3,6,7-naphthalenetetracarboxylic acid, 1,2,5,6-naphthalenetetracarboxylic acid, and 1,4,5,8-naphthalenetetracarboxylic acid. , 2,3,6,7-decanetetracarboxylic acid, 1,2,5,6-nonanetetracarboxylic acid, 3,3',4,4'-biphenyltetracarboxylic acid, 2,3,3', 4-biphenyltetracarboxylic acid, bis(3,4-dicarboxyphenyl)ether, 3,3',4,4'-benzophenonetetracarboxylic acid, bis(3,4-dicarboxyphenyl) Bismuth, bis(3,4-dicarboxyphenyl)methane, 2,2-bis(3,4-dicarboxyphenyl)propane, 1,1,1,3,3,3-hexafluoro-2,2 -double (3,4-dicarboxyphenyl)propane, bis(3,4-dicarboxyphenyl)dimethyloxane, bis(3,4-dicarboxyphenyl)diphenylnonane, 2,3,4, 5-pyridyltetracarboxylic acid, 2,6-bis(3,4-dicarboxyphenyl)pyridine, 3,3',4,4'-diphenylphosphonium tetracarboxylic acid, 3,4,9,10- Terpene tetracarboxylic acid, 1,3-diphenyl-1,2,3,4-cyclobutanetetracarboxylic acid, oxybisphthalic acid, 1,2,3,4-cyclobutanetetracarboxylic acid 1,2,3,4-cyclopentanetetracarboxylic acid, 1,2,4,5-cyclohexanetetracarboxylic acid, 1,2,3,4-tetramethyl-1,2,3,4 -cyclobutane tetracarboxylic acid, 1,2-dimethyl-1,2,3,4-cyclobutanetetracarboxylic acid, 1,3-dimethyl-1,2,3,4-cyclobutane Tetracarboxylic acid, 1,2,3,4-cycloheptane tetracarboxylic acid, 2,3,4,5-tetrahydrofuran tetracarboxylic acid, 3,4-dicarboxy-1-cyclohexyl succinic acid, 2,3, 5-tricarboxycyclopentyl acetic acid, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic acid, bicyclo[3,3,0]octane-2,4,6 , 8-tetracarboxylic acid, bicyclo[4,3,0]nonane-2,4,7,9-tetracarboxylic acid, bicyclo[4,4,0]nonane-2,4,7,9 -tetracarboxylic acid, bicyclo[4,4,0]nonane-2,4,8,10-tetracarboxylic acid, tricyclo[6.3.0.0<2,6>]undecane-3,5,9 ,11-tetracarboxylic acid, 1,2,3,4-butanetetracarboxylic acid, 4-(2,5-di-oxo-tetrahydrofuran-3-yl)-1,2 , 3,4-tetrahydronaphthalene-1,2-dicarboxylic acid, bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic acid, 5-(2,5 - two-sided oxytetrahydrofuranyl-3-methyl-3-cyclohexane-1,2-dicarboxylic acid, tetracyclo[6,2,1,1,0,2,7]dodecane-4, 5,9,10-tetracarboxylic acid, 3,5,6-tricarboxynorbornane-2:3,5:6 dicarboxylic acid, 1,2,4,5-cyclohexanetetracarboxylic acid, and the like. Of course, the tetracarboxylic dianhydride may be used alone or in combination of two or more kinds in accordance with the characteristics of the liquid crystal alignment property, the voltage retention property, and the charge accumulation in the case of the liquid crystal alignment film.

The diamine (also referred to as "diamine component") as a raw material is reacted with a tetracarboxylic dianhydride (also referred to as "tetracarboxylic dianhydride component") as a raw material. For the polyamic acid, a known synthetic method can be used. In general, there is a method of reacting a diamine component with a tetracarboxylic dianhydride component in an organic solvent. The reaction between the diamine component and the tetracarboxylic dianhydride component is advantageous because it is relatively easy to carry out in the organic solvent and does not cause by-products.

The organic solvent used for the above reaction is not particularly limited as long as it is soluble in the produced polylysine or the like. Further, even an organic solvent which is insoluble in polyacrylic acid or the like may be used in the above-mentioned solvent in a range in which the produced polylysine or the like is not precipitated. Further, since the water in the organic solvent hinders the polymerization reaction and further causes hydrolysis of the produced polylysine or the like, the organic solvent is preferably used for dehydrating and drying the organic solvent. The organic solvent used in the reaction may, for example, be N,N-dimethylformamide, N,N-dimethylacetamide, N,N-diethylformamide or N-methylformamidine. Amine, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, 2-pyrrolidone, 1,3-dimethyl-2-tetrahydroimidazolone, 3-methoxy -N,N-dimethylpropane decylamine, N-methylcaprolactone, dimethyl hydrazine, tetramethyl urea, pyridine, dimethyl hydrazine, hexamethylarylene, γ-butyrolactone, Isopropanol, methoxymethylpentanol, dipentene, ethyl pentanone, methyl fluorenone, methyl ethyl ketone, methyl isoamyl ketone, methyl isopropyl ketone, methyl 赛路苏, ethyl celecoxib, methyl sarbuta acetate, butyl succinate acetate, ethyl sirolimus acetate, butyl carbitol, ethyl carbitol, ethylene glycol, Ethylene glycol monoacetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, propylene glycol, propylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol monobutyl ether, propylene glycol-tert-butyl Ethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diethylene glycol, diethylene glycol monoacetate, diethylene glycol Methyl ether, diethylene Alcohol diethyl ether, dipropylene glycol monoacetate monomethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monoacetate monoethyl ether, dipropylene glycol monopropyl ether, two Propylene glycol monoacetate monopropyl ether, 3-methyl-3-methoxybutyl acetate, tripropylene glycol methyl ether, 3-methyl-3-methoxybutanol, diisopropyl ether , ethyl isobutyl ether, diisobutylene, pentyl acetate, butyl butyrate, butyl ether, diisobutyl ketone, methyl cyclohexene, propyl ether, dihexyl ether, dioxane , n-hexane, n-pentane, n-octane, diethyl ether, cyclohexanone, ethylene carbonate, propylene carbonate, methyl lactate, ethyl lactate, methyl acetate, acetic acid Base ester, n-butyl acetate, propylene glycol monoethyl ether acetate, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl 3-ethoxypropionate Base ester, ethyl 3-methoxypropionate, 3-ethoxypropionic acid, 3-methoxypropionic acid, 3-methoxypropionic acid propyl ester, 3-methoxypropionic acid butyl Ester, diethylene glycol dimethyl ether, 4-hydroxy-4-methyl-2-pentanone, 2-ethyl-1- Alcohol. These organic solvents may be used singly or in combination.

When the diamine component and the tetracarboxylic dianhydride component are reacted in an organic solvent, a solution obtained by dispersing or dissolving the diamine component in an organic solvent may be mentioned, and the tetracarboxylic dianhydride component may be directly added, or It is a method of dispersing or dissolving in an organic solvent, and conversely, a solution in which a tetracarboxylic dianhydride component is dispersed or dissolved in an organic solvent, a method of adding a diamine component, and a tetracarboxylic acid are alternately added. Any of these methods can be used as the method of the acid dianhydride component and the diamine component. Further, when a diamine component or a tetracarboxylic dianhydride component is formed of a plurality of kinds of compounds, it can be reacted in a state of being mixed in advance, and each of them is reacted in order, and a low molecular molecule which is individually reacted is formed. The mixture is reacted to form a high molecular weight body.

The temperature at which the diamine component and the tetracarboxylic dianhydride component are reacted may be any temperature, for example, -20 ° C to 150 ° C, preferably -5 ° C to 100 ° C. Further, the reaction system can be carried out at any concentration. For example, the total amount of the diamine component and the tetracarboxylic dianhydride component in the reaction liquid is 1 to 50% by mass, preferably 5 to 30% by mass.

In the above polymerization reaction, the ratio of the total number of moles of the tetracarboxylic dianhydride component to the total number of moles of the diamine component can be selected according to the molecular weight of the desired polyamic acid or the like. As in the case of the general polycondensation reaction, the closer the molar ratio is to 1.0, the larger the molecular weight of the produced polyamine or the like becomes. If the preferred range is displayed, it is 0.8~1.2.

The method for synthesizing the poly-proline used in the present invention is not limited to the above-described method, and the dihalogenation of a tetracarboxylic acid or a tetracarboxylic acid using a corresponding structure is carried out in the same manner as the general method for synthesizing poly-proline. A tetracarboxylic acid derivative such as a compound is substituted for the above tetracarboxylic dianhydride and reacted by a known method to obtain a corresponding polyamine.

The method of imidating the polyimine precursor such as the polyamic acid to the polyimine is exemplified by directly heating the solution of the polyimide precursor such as polylysine. The ruthenium imidization is carried out by adding a catalyst to a polyimide reaction solution such as polyaminic acid. Further, the polyimide imidization ratio from the polyimine precursor such as polyamic acid to the polyimine is not necessarily 100%.

The temperature at which the polyaminic acid is thermally imidated in a solution is 100 ° C to 400 ° C, preferably 120 ° C to 250 ° C, and is imidized by deuterium. It is preferred that the water side formed by the reaction is excluded from the outside of the reaction system.

The ruthenium imide of poly-proline can be stirred by adding a basic catalyst and an acid anhydride to a solution of poly-proline, and stirring at -20 to 250 ° C, preferably 0 to 180 ° C. Implementation. The amount of the basic catalyst is 0.5 to 30 moles, preferably 2 to 20 moles, of the prolyl group, and the amount of the acid anhydride is 1 to 50 moles, preferably 3 to the prolyl group. 30 moles. Examples of the basic catalyst include pyridine, triethylamine, trimethylamine, tributylamine, trioctylamine, and the like, and among them, the pyridine reaction is moderately alkaline when the reaction is carried out. good. Examples of the acid anhydride include anhydrous acetic acid, anhydrous trimellitic acid, and anhydrous pyromellitic acid. Among them, when anhydrous acetic acid is used, purification after completion of the reaction becomes easy, and it is preferable. The rate of ruthenium imidization caused by the imidization of the catalyst can be controlled by the amount of the catalyst and the reaction temperature and reaction time.

When recovering a polyimine precursor such as polylysine or a polyimine from a reaction solution of a polyamidene precursor such as polylysine or a polyimide reaction, if the reaction solution is put into poverty The solvent can be precipitated. Examples of the poor solvent used in the precipitation include methanol, acetone, hexane, butyl sirolimus, heptane, methyl ethyl ketone, methyl isobutyl ketone, ethanol, toluene, benzene, water, and the like. The polymer which has been precipitated by the lean solvent and recovered by filtration can be dried at normal temperature or under heat at normal pressure or reduced pressure. Further, the precipitated and recovered polymer is redissolved in an organic solvent, and the reprecipitation recovery operation is repeated 2 to 10 times to reduce impurities in the polymer. In the case of the poor solvent, for example, alcohols, ketones, hydrocarbons, and the like are used. When three or more kinds of poor solvents selected from the above are used, the purification efficiency can be further improved.

[(B) component]

The liquid crystal alignment agent of the present invention and the component (B) include a polymerizable compound having a photopolymerization or photocrosslinking group at one or more terminals. In other words, the component (B) of the polymerizable compound contained in the liquid crystal alignment agent of the present invention is a compound having a photopolymerization or photocrosslinking group at one end. Here, the polymerizable compound having a photopolymerization group is a compound having a functional group which generates polymerization by irradiation with light. Further, the polymerizable compound having a photocrosslinking group is a polymer which can be reacted with a polymerizable compound by irradiation or a polymer which is a component (A) or a component (C). A compound of a functional group crosslinked with such. Further, the polymerizable compound having a photocrosslinking group is a polymerizable compound having a photocrosslinking group and reacts with each other.

By using such a polymerizable compound as a side chain having a vertical alignment with a liquid crystal and containing a methacryl group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group a selected at least one photoreactive side chain polyimine precursor, and a component of at least one polymer selected from the polyamidene obtained by imidating the polyimine precursor ruthenium (A) In the production of a liquid crystal display element for a vertical alignment type of an SC-PVA type liquid crystal display or the like, the side chain and photoreactivity which cause the liquid crystal to be vertically aligned are used separately from the liquid crystal alignment agent. In the case of the polymer of the side chain or the polymerizable compound, the response speed can be drastically increased, and even if a small amount of the polymerizable compound is added, the response speed can be sufficiently increased.

The base of photopolymerization or photocrosslinking is exemplified by one of the formulas represented by the above formula (II).

Specific examples of the component (B) of the polymerizable compound include a polymerizable compound having a photopolymerizable group at both terminals represented by the following formula (III), and having a light as shown in the following formula (IV). A polymerizable compound having a terminal at the end of the polymerization and a terminal having a photocrosslinking group, or a polymerizable compound having a photocrosslinking group at both ends of the formula (V). Further, in the following formulae (III) to (V), R ¹² , Z ¹ and Z ² are the same as those of R ¹² , Z ¹ and Z ² in the above formula (II), and Q ¹ is a divalent organic group. Q ¹ is a ring structure having a stretching phenyl group (-C ₆ H ₄ -), a stretching biphenyl group (-C ₆ H ₄ -C ₆ H ₄ -) or a cyclohexyl group (-C ₆ H ₁₀ -). It is better. This is because the interaction with the liquid crystal is likely to become large.

Specific examples of the polymerizable compound represented by the formula (III) include the following polymerizable compounds. Wherein the V-based single bond or the alkyl group having a carbon number of 1 to 10 represented by -R ¹ O- and the R ¹ linear or branched, preferably represented by -R ¹ O- and the R ¹ system A linear or branched carbon group having 2 to 6 carbon atoms. Further, W is a single bond or an alkylene group having a carbon number of 1 to 10 represented by -OR ² - and R ² is a straight chain or a branched group, preferably represented by -OR ² - and R ² is linear or Branches have a carbon number of 2 to 6 alkyl groups. Further, although V and W may have the same or different structures, it is easier to synthesize if they are the same.

The polymerizable compound represented by the above formula has a specific structure of a α-methylene-γ-butyrolactone group having a polymerizable group at both ends, and the polymer has a fixed structure and the alignment of the liquid crystal is fixed. The polymerization ability is excellent, or as shown in the examples described later, by polymerization using at least one selected from the polyimine imine obtained by imidating the polyimine precursor and the polyimine precursor. In the manufacture of a liquid crystal display element of a vertical alignment type such as an SC-PVA liquid crystal display which is a material of a liquid crystal alignment film, the response speed can be particularly greatly improved. Further, in general, in order to completely remove the solvent during the formation of the liquid crystal alignment film, the step of high-temperature baking is included, but it has an acrylate group, a methacrylate group, a vinyl group, a hydroxyl group, an epoxy group or the like. The polymerizable group compound lacks thermal stability and is difficult to withstand firing at high temperatures. On the other hand, the polymerizable compound having the α-methylene-γ-butyrolactone group at both terminals has a structure which lacks thermal polymerization property and has a high temperature, for example, a firing temperature of 200 ° C or higher. Very tolerant.

Further, in terms of photopolymerization or photocrosslinking, even if it does not have an α-methylene-γ-butyrolactone group, it has a polymerizable compound having an acrylate group or a methacrylate group, and if it has such an acrylate a polymerizable compound having a structure in which a group or a methacrylate group is bonded to a phenyl group via an interval of an alkyl group or the like, and has an α-methylene-γ-butyrolactone group at each of the above two ends. Similarly, the polymerizable compound can increase the response speed particularly greatly. Further, in the case of a polymerizable compound having a structure in which an acrylate group or a methacrylate group is bonded to a phenyl group via an interval of an oxygen-extension alkyl group or the like, it may be due to an increase in heat stability. It is resistant to a high temperature, for example, a firing temperature of 200 ° C or higher.

Further, as another specific example of the polymerizable compound represented by the formula (III), a polymerizable compound of the following formula may be mentioned.

(wherein, V is a single bond or a linear alkyl group represented by -R ¹ O- and R ¹ is a linear or branched alkyl group having 1 to 10 carbon atoms, preferably -R ¹ O- and R ¹ is a a linear or branched carbon group having 2 to 6 carbon atoms. Further, W is a single bond or an alkylene group having a carbon number of 1 to 10 as represented by -OR ² - and R ² is a straight chain or a branched group. It is an alkyl group having a carbon number of 2 to 6 which is represented by -OR ² - and R ² is linear or branched. V and W may be the same or different structures, but if they are the same, the synthesis is relatively easy. ¹² series H or an alkyl group having 1 to 4 carbon atoms.)

<Method for Producing (B) Component>

The method for producing the component (B) as the polymerizable compound is not particularly limited, and can be produced, for example, according to a synthesis example described later. For example, the polymerizable compound represented by the following formula (1) can be synthesized by a combination of organic synthetic chemistry. For example, the following reaction formula Ta Lage et al., The P.Talaga, M.Schaeffer, C.Benezra and JLStampf, Synthesis, 530 (1990) proposed a method of, SnCl ₂ using the 2- (bromomethyl 2-(bromomethyl)propenoic acid is reacted with an aldehyde or a ketone to carry out the synthesis. Further, Amberlyst 15 is a strongly acidic ion exchange resin manufactured by Rohm and Haas.

(wherein R' represents a monovalent organic group.)

Further, 2-(bromomethyl)acrylic acid can be represented by the following reaction formula by Rama Lang et al. in K. Ramarajan, K. Kamalingam, DJO' Donnell and KDBerlin, Organic Synthesis, vol. 61, 56-59. (1983) The method of the proposal to synthesize.

In a specific synthesis example, in the case of synthesizing a polymerizable compound represented by the above formula (1) wherein V is -R ¹ O-, W is -OR ² - and R ¹ and R ^{2 are the} same, the following reaction can be mentioned. The method shown by the formula.

Further, in the case of synthesizing the polymerizable compound represented by the above formula (1) in which R ¹ and R ^{2 are} different, a method represented by the following reaction formula may be mentioned.

Further, when a polymerizable compound represented by the above formula (1) in which V and W are a single bond is synthesized, a method represented by the following reaction formula may be mentioned.

[(C) component]

The liquid crystal alignment agent of the present invention contains, in terms of (C) component, at least selected from the group consisting of methacrylic acid group, acrylic group, vinyl group, allyl group, coumarin group, styryl group and cinnamyl group. a photoreactive side chain diamine, a polyimine precursor obtained by reacting at least one diamine selected from the above formulas (C-1) to (C-5) with a tetracarboxylic dianhydride, and The polymer selected from the polyimine obtained by imidization of the polyimine precursor.

Definitions or specific examples of "a side chain containing at least one photoreactivity selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group", And above [(A) The same as described in the component]. Further, specific examples of the diamine having at least one photoreactive side chain selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group are It is the same as that described in the above [(A) component].

Further, such a diamine having at least one photoreactive side chain selected from a methacrylic group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group is used. Preferably, the amount of 10 mol% to 60 mol% of the polydiamine component such as polyamine derivative of (C) component or the total diamine component used in the synthesis of polyimine is preferably 10 mol. Ear %~40% by mole, especially preferably 20% by mole to 30% by mole.

Further, as the polymer of the component (C), at least one of the diamines selected from the above formulae (C-1) to (C-5) is also a raw material. When at least one of the diamines selected from the above formulas (C-1) to (C-5) is also a raw material, it is possible to improve the accumulated charge characteristics by waiting for a diamine of a specific structure having a high polarity. The diamine of at least one selected from the above formulas (C-1) to (C-5) may, for example, be a diamine described later, but is not limited thereto.

The at least one diamine selected by the above formula (C-1) to (C-5) is synthesized by using a polyimine precursor such as poly (proline) or a polyimine. It is preferred that the amount of the total diamine component used is from 10 mol% to 80 mol%.

In addition, the raw material having the diamine or other diamine having a side chain in which the liquid crystal is vertically aligned as the component (C) described in the above [(A) component] may be used without impairing the effects of the present invention. For example, when a diamine having a side chain in which the liquid crystal is vertically aligned is also used as a raw material, the diamine having a side chain in which the liquid crystal is vertically aligned is a polyimine which uses a polyamine such as a component (C). It is preferred that the precursor or the total diamine component used in the synthesis of the polyimine is in an amount of from 10 mol% to 30 mol%.

Further, the tetracarboxylic dianhydride component which is reacted with the above diamine component is the same as the tetracarboxylic dianhydride component described in the above [(A) component].

A method of producing the component (C), if it is a photoreactive side having at least one selected from a methacrylic group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group a diamine of a chain, at least one diamine selected from the above formulas (C-1) to (C-5), a tetracarboxylic dianhydride, and further optionally a side chain having a side chain perpendicular to the liquid crystal. The amine or other diamine may be reacted to obtain a polyimine precursor or a polyimine. For example, the at least one diamine selected from the above formulas (C-1) to (C-5) is the same as the production method described in the above <Production Method of the component (A).

The liquid crystal alignment agent of the present invention is preferably one having the following components (A) to (C) and a solvent as described above: having a liquid crystal perpendicularly aligned a side chain and a polyimine having a photoreactive side chain selected from at least one selected from the group consisting of methacrylic acid, acrylic acid, vinyl, allyl, coumarinyl, styryl, and cinnamyl a precursor and at least one polymer (A) component selected from the polyimine obtained by imidating the polyimine precursor ruthenium, and a polymerization having photopolymerization or photocrosslinking groups at one or more terminals The compound (B) component, which has at least one photoreactive side chain selected from the group consisting of methacrylic acid, acrylic acid group, vinyl group, allyl group, coumarin group, styryl group and cinnamyl group Polyimine precursor obtained by reacting a diamine with a predetermined structure of a diamine and a tetracarboxylic dianhydride selected from the above formulas (C-1) to (C-5) and the polyimine precursor The component (C) of the polymer selected from the polyimine obtained by imidization, and the blending ratio thereof is not particularly limited, and the content of the component (B) is 100 parts by mass of the component (A). It is preferably 1 to 50 parts by mass, more preferably 5 to 30 parts by mass. Further, the content of the component (A) of the liquid crystal alignment agent of the present invention is preferably from 1% by mass to 20% by mass, more preferably from 3% by mass to 15% by mass, particularly preferably from 3% by mass to 10% by mass.

Further, the inclusion of the component (A) and the component (C) is not particularly limited. For example, the component (A) is a mass ratio: (C) component = 1:9 to 5:5.

Further, the liquid crystal alignment agent of the present invention may contain other polymers than the components (A) and (C). In this case, the content of the other polymer in the entire polymer component is preferably 0.5% by mass to 15% by mass, more preferably 1% by mass to 10% by mass.

The molecular weight of the polymer possessed by the liquid crystal alignment agent, if the coating liquid is considered When the strength of the liquid crystal alignment film obtained by the crystal alignment agent and the workability at the time of coating film formation and the uniformity of the coating film, the weight average molecular weight measured by the GPC (Gel Permeation Chromatography) method is preferably 5,000 to 1,000,000. Good for 10,000~150,000.

The solvent to be contained in the liquid crystal alignment agent is not particularly limited, and the component (A), the component (B) or the component (C) may be dissolved or dispersed. For example, an organic solvent exemplified in the synthesis of polylysine or the like as described above can be mentioned. Among them, N-methyl-2-pyrrolidone, γ-butyrolactone, N-ethyl-2-pyrrolidone, 1,3-dimethyl-2-tetrahydroimidazolidone, 3-methoxy -N,N-dimethylpropane decylamine is preferred from the viewpoint of solubility. Of course, it is also possible to use two or more kinds of mixed solvents.

Further, it is preferred that the solvent is used to improve the uniformity or smoothness of the coating film, and it is preferably used in a solvent having a high solubility in a liquid crystal alignment agent-containing component. Examples of the solvent for improving the uniformity or smoothness of the coating film include, for example, isopropyl alcohol, methoxymethylpentanol, methyl stilbene, ethyl serosol, butyl siroli, methyl sin. Lucas acetate, butyl succinate acetate, ethyl sirolimus acetate, butyl carbitol, ethyl carbitol, ethyl carbitol acetate, ethylene glycol, B Glycol monoacetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, propylene glycol, propylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol monobutyl ether, propylene glycol-tert-butyl Ether, dipropylene glycol monomethyl ether, diethylene glycol, diethylene glycol monoacetate, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dipropylene glycol monoacetate monomethyl Ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol monoacetate monoethyl ether, dipropylene glycol monopropyl ether, Dipropylene glycol monoacetate monopropyl ether, 3-methyl-3-methoxybutyl acetate, tripropylene glycol methyl ether, 3-methyl-3-methoxybutanol, diisopropyl Ether, ethyl isobutyl ether, diisobutylene, pentyl acetate, butyl butyrate, butyl ether, diisobutyl ketone, methyl cyclohexene, propyl ether, dihexyl ether, n- Hexane, n-pentane, n-octane, diethyl ether, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, n-butyl acetate, propylene glycol monoethyl acetate Ether, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl 3-ethyloxypropionate, ethyl 3-methoxypropionate, 3 - ethoxypropionic acid, 3-methoxypropionic acid, 3-methoxypropionic acid propyl ester, 3-methoxypropionic acid butyl ester, 1-methoxy-2-propanol, 1- Ethoxy-2-propanol, 1-butoxy-2-propanol, 1-phenoxy-2-propanol, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol-1-monomethyl Ether-2-acetate, propylene glycol-1-monoethyl ether-2-acetate, dipropylene glycol, 2-(2-ethoxypropoxy)propanol, methyl lactate, ethyl lactate , N-propyl lactate, n-butyl lactate, isoamyl lactate, 2-ethyl-1-hexanol, and the like. These solvents can also be mixed with most types. When the solvent is used, it is preferably from 5 to 80% by mass, more preferably from 20 to 60% by mass, based on the total amount of the solvent contained in the liquid crystal alignment agent.

The liquid crystal alignment agent may contain components other than the above. In this case, a compound which improves film thickness uniformity or surface smoothness when a liquid crystal alignment agent is applied, a compound which improves adhesion of a liquid crystal alignment film and a substrate, and the like are mentioned.

Examples of the compound which improves the uniformity of the film thickness or the surface smoothness include a fluorine-based surfactant, a polyfluorene-based surfactant, and a non-ionic boundary. Surfactant and the like. More specifically, for example, EFTop EF301, EF303, EF352 (manufactured by TOHKEM PRODUCTS), Megafac F171, F173, R-30 (manufactured by Dainippon Ink Co., Ltd.), Florad FC430, FC431 (manufactured by Sumitomo 3M), AashiGuard AG710 , Surflon S-382, SC101, SC102, SC103, SC104, SC105, SC106 (made by Asahi Glass Co., Ltd.). When the surfactant is used, the use ratio is preferably 0.01 to 2 parts by mass, more preferably 0.01 to 1 part by mass, per 100 parts by mass of the total amount of the polymer contained in the liquid crystal alignment agent.

Specific examples of the compound which improves the adhesion between the liquid crystal alignment film and the substrate include a functional decane-containing compound or an epoxy group-containing compound. For example, 3-aminopropyltrimethoxydecane, 3-aminopropyltriethoxydecane, 2-aminopropyltrimethoxydecane, 2-aminopropyltriethoxydecane, N-(2-Aminoethyl)-3-aminopropyltrimethoxydecane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxydecane, 3-urea Propyltrimethoxydecane, 3-ureidopropyltriethoxydecane, N-ethoxycarbonyl-3-aminopropyltrimethoxydecane, N-ethoxycarbonyl-3-aminopropyl Triethoxy decane, N-triethoxydecylpropyltriethylenetriamine, N-trimethoxydecylpropyltriethylenetriamine, 10-trimethoxydecyl-1,4,7- Triazanonane, 10-triethoxydecyl-1,4,7-triazadecane, 9-trimethoxydecyl-3,6-diazaindolyl acetate, 9- Triethoxydecyl-3,6-diazaindolyl acetate, N-benzyl-3-aminopropyltrimethoxydecane, N-benzyl-3-aminopropyltri Ethoxy decane, N-phenyl-3-aminopropyltrimethoxydecane, N-phenyl-3-aminopropyltriethyl Oxydecane, N-bis(oxyethylene)-3-aminopropyltrimethoxydecane, N-bis(oxyethylene)-3-aminopropyltriethoxydecane, ethylene glycol diepoxypropane Ether, polyethylene glycol diepoxypropyl ether, propylene glycol diepoxypropyl ether, tripropylene glycol diepoxypropyl ether, polypropylene glycol diepoxypropyl ether, neopentyl glycol diepoxypropyl ether 1,6-hexanediol diepoxypropyl ether, glycerol diepoxypropyl ether, 2,2-dibromo neopentyl glycol diepoxypropyl ether, 1,3,5,6 -tetraepoxypropyl-2,4-hexanediol, N,N,N',N'-tetraepoxypropyl-m-xylenediamine, 1,3-bis(N,N-di Epoxypropylaminomethyl)cyclohexane, N,N,N',N'-tetraepoxypropyl-4,4'-diaminodiphenylmethane, 3-(N-allyl -N-epoxypropyl)aminopropyltrimethoxydecane, 3-(N,N-diepoxypropyl)aminopropyltrimethoxydecane, and the like. Further, in order to further improve the film strength of the liquid crystal alignment film, 2,2'-bis(4-hydroxy-3,5-dihydroxymethylphenyl)propane or tetrakis(methoxymethyl)bisphenol may be added. Phenol compound. When the compound is used, it is preferably 0.1 to 30 parts by mass, more preferably 1 to 20 parts by mass, per 100 parts by mass of the total amount of the polymer contained in the liquid crystal alignment agent.

Further, in the liquid crystal alignment agent, in addition to the above, a dielectric or conductive material for changing the electrical properties such as dielectric constant or conductivity of the liquid crystal alignment film may be added in a range that does not impair the effects of the present invention. substance.

This liquid crystal alignment agent is applied onto a substrate and fired to form a liquid crystal alignment film which vertically aligns the liquid crystal. The liquid crystal alignment agent of the present invention contains: a side chain having a liquid crystal perpendicularly aligned and containing a methacrylic group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cassia At least one photoreactive side chain selected by the group a polyimine precursor, and a component (A) of at least one polymer selected from the polyimine obtained by imidating the polyimine precursor quinone, and having light at one or more ends Since the component (B) of the polymerizable compound which is polymerized or photocrosslinked is used, the response speed of the liquid crystal display element using the obtained liquid crystal alignment film can be increased. Further, in terms of polymer, it is not only due to the component (A), but also because it is selected by having a methacrylic group, an acrylic group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group. At least one photoreactive side chain diamine, a polyimine obtained by reacting at least one diamine selected from the above formulas (C-1) to (C-5) with a tetracarboxylic dianhydride The precursor and the component (C) of at least one polymer selected from the polyimine obtained by imidating the polyimine precursor ruthenium can improve the accumulated charge characteristics.

In the case of the substrate to be used, the substrate having high transparency is not particularly limited, and a plastic substrate such as a glass substrate, an acrylic substrate or a polycarbonate substrate can be used. Moreover, it is preferable to use a substrate on which an ITO electrode for liquid crystal driving or the like is formed, from the viewpoint of process simplification. Further, if the reflective liquid crystal display element is only a single-sided substrate, an opaque material such as a germanium wafer can be used. In this case, a material such as aluminum that reflects light can be used.

The coating method of the liquid crystal alignment agent is not particularly limited, and examples thereof include a method of screen printing, lithography, flexographic printing, ink jet printing, etc., or immersion, roll coating, slit coating, and the like. Spin coating, etc.

The baking temperature of the coating film formed by coating the liquid crystal alignment agent is not limited, and can be carried out, for example, at any temperature of 100 to 350 ° C, preferably 120 ° C to 300 ° C, and more preferably 150. °C~250°C. This firing system can The heating plate, the hot air circulation furnace, the far outer wire furnace, and the like are performed.

Further, the thickness of the liquid crystal alignment film obtained by firing is not particularly limited, but is preferably 5 to 300 nm, more preferably 10 to 100 nm.

Further, the liquid crystal display device of the present invention is provided with a liquid crystal display device having a vertical alignment type of a liquid crystal cell, wherein the liquid crystal cell has two liquid crystal substrates disposed opposite each other, and a liquid crystal layer disposed between the substrates. a liquid crystal cell of the liquid crystal alignment film formed by the liquid crystal alignment agent of the present invention between the substrate and the liquid crystal layer. Specifically, the liquid crystal alignment agent of the present invention is applied to two substrates to be fired to form a liquid crystal alignment film, and the liquid crystal alignment film is disposed in two opposite directions. A liquid crystal display element in which a liquid crystal layer composed of a liquid crystal is sandwiched between the substrates and a liquid crystal cell produced by irradiating ultraviolet rays while applying a voltage to the liquid crystal alignment film and the liquid crystal layer is vertically aligned. By using the liquid crystal alignment film formed by the liquid crystal alignment agent of the present invention, a liquid is applied to the liquid crystal alignment film and the liquid crystal layer while irradiating ultraviolet rays to polymerize the polymerizable compound, and the photoreactive side of the polymer is obtained. The chains or the side chains which have photoreactivity of the polymer react with the polymerizable compound, and the alignment of the liquid crystal can be more efficiently immobilized, and the liquid crystal display element is remarkably excellent in response speed. Further, it becomes a liquid crystal display element having a small accumulated charge.

In the substrate for use in the liquid crystal display device of the present invention, the substrate having high transparency is not particularly limited, and a substrate in which a transparent electrode for driving a liquid crystal is driven on a substrate is usually used. Specific examples thereof are the same as those described in the above liquid crystal alignment film. Although a substrate having a conventional electrode pattern or a protrusion pattern can be used, the liquid crystal display element of the present invention In the above, the liquid crystal alignment agent of the present invention is used as a liquid crystal alignment agent for forming a liquid crystal alignment film, and a line/slit electrode pattern of 1 to 10 μm is formed on one side substrate, and may not be formed on the opposite substrate. In the structure of the slit pattern or the protrusion pattern, and by the liquid crystal display element thus constructed, the manufacturing process can be simplified, and high transmittance can be obtained.

Further, in a high-performance element such as a TFT-type element, an element such as a transistor can be formed between an electrode for driving a liquid crystal and a substrate.

In the case of a transmissive liquid crystal display device, a substrate as described above is generally used. However, in a reflective liquid crystal display device, an opaque substrate such as a germanium wafer may be used as the substrate on one side. At this time, as the electrode formed on the substrate, a material such as aluminum which can reflect light can also be used.

The liquid crystal alignment film is formed by baking the liquid crystal alignment agent of the present invention on the substrate, and is as described above in detail.

The liquid crystal material constituting the liquid crystal layer in the liquid crystal display device of the present invention is not particularly limited, and a liquid crystal material used in a conventional vertical alignment method, for example, a negative liquid crystal such as MLC-6608 or MLC-6609 manufactured by Merck Co., Ltd. can be used. .

A well-known method is mentioned in the method of holding this liquid crystal layer between two board|substrate. For example, a pair of substrates on which a liquid crystal alignment film is formed is prepared, and a space such as beads is spread on a liquid crystal alignment film of one substrate, and the other substrate is bonded to the inner side of the surface on which the liquid crystal alignment film is formed. A method in which a liquid crystal is injected under reduced pressure to be sealed. Further, a pair of substrates on which a liquid crystal alignment film is formed is prepared, and a liquid crystal is deposited on a liquid crystal alignment film of a substrate, and then a liquid crystal is dropped, and then a surface on the side where the liquid crystal alignment film is formed is inside. A liquid crystal cell can also be produced by laminating another substrate for sealing. The thickness of the interval at this time is preferably from 1 to 30 μm, more preferably from 2 to 10 μm.

a step of producing a liquid crystal cell by applying ultraviolet light to a liquid crystal alignment film and a liquid crystal layer, for example, applying a voltage between electrodes provided on the substrate to apply an electric field to the liquid crystal alignment film and the liquid crystal layer, and A method of irradiating ultraviolet rays while maintaining this electric field. Here, the voltage applied between the electrodes is, for example, 5 to 30 Vp-p, preferably 5 to 20 Vp-p. The irradiation amount of the ultraviolet ray is, for example, 1 to 60 J, preferably 40 J or less, and the less the amount of the ultraviolet ray is applied, the decrease in reliability due to the destruction of the member constituting the liquid crystal display element can be suppressed, and the ultraviolet irradiation time can be reduced. Manufacturing efficiency is therefore preferred.

As described above, when a voltage is applied to the liquid crystal alignment film and the liquid crystal layer, ultraviolet rays are irradiated, and the polymerizable compound reacts to form a polymer, whereby the polymer can memorize the direction in which the liquid crystal molecules are tilted, and the response speed of the obtained liquid crystal display element can be accelerated. Further, when a voltage is applied to the liquid crystal alignment film and the liquid crystal layer, ultraviolet rays are irradiated, and the side chain of photoreactivity which is contained in the component (A) or the component (C) of the polymer or the component (A) or (C) The photoreactive side chain of the component reacts with the component (B) which is a polymerizable compound, so that the response speed of the obtained liquid crystal display element can be increased, and the accumulated charge characteristics are also improved.

Further, the liquid crystal alignment agent can be used not only as a liquid crystal alignment agent for a liquid crystal display element of a vertical alignment type such as a PSA liquid crystal display or an SC-PVA liquid crystal display, but also for a rubbing treatment or a photo alignment treatment. The use of liquid crystal alignment film.

[Examples]

The invention is illustrated by the following examples, and the invention is further illustrated in detail, but the invention is not limited thereto.

[Examples] <Modulation of liquid crystal alignment agent>

The abbreviations used in the preparation of the liquid crystal alignment agent described below are as follows.

. Acid dianhydride

BODA: bicyclo[3,3,0]octane-2,4,6,8-tetracarboxylic dianhydride

CBDA: 1,2,3,4-cyclobutane tetracarboxylic dianhydride

TCA: 2,3,5-tricarboxycyclopentyl acetic acid dianhydride

. Diamine

p-PDA: p-phenylenediamine

m-PDA: m-phenylene diamine

PCH: 1,3-diamino-4-[4-(4-heptylcyclohexyl)phenoxy]benzene

DBA: 3,5-diamino benzoic acid

BEM-S: 2-(methacryloyl)ethyl 3,5-diaminobenzoate represented by the following formula

3AMPDA: 3,5-diamino-N-(pyridin-3-ylmethyl)benzamide shown by the following formula

DADPA: N1-(4-aminophenyl)benzene-1,4-diamine represented by the following formula

DA-Col: 3,5-diamino benzoic acid cholestane

. Solvent

NMP: N-methyl-2-pyrrolidone

BCS: Butyl Cyrus

. Polymeric compound

RM1: a polymerizable compound represented by the following formula: 5,5'-(4,4'-(biphenyl-4,4'-diylbis(oxy)) bis(butane-4,1-diyl) ) bis(3-methylenedihydrofuran-2(3H)-one)

(Synthesis of polymerizable compound (RM1))

In a 300 ml eggplant-shaped flask with a cooling tube, 6.7 g (35.9 mmol) of 4,4'-biphenol and 15.0 g of 2-(4-bromobutyl)-1,3-dioxopentane were placed (71.7). Methyl), 19.8 g (143 mmol) of potassium carbonate and 150 ml of acetone were mixed, and the mixture was stirred at 60 ° C for 48 hours to cause a reaction. After completion of the reaction, the solvent was evaporated under reduced pressure to give a yellow, wet solid. Thereafter, 200 ml of this solid and water were mixed, and 80 ml of chloroform was added thereto for extraction. The extraction was carried out 3 times.

Anhydrous magnesium sulfate was added to the organic layer which had been separated, and dried. After filtration, the solvent was evaporated under reduced pressure to give a yellow solid. This solid was purified by recrystallization (hexane / chloroform = 4 / 1 (volume ratio)) to yield 14.6 g of white solid. The results of NMR measurement of the obtained white solid are shown below. Further, the obtained solid was dissolved in deuterated chloroform (CDCl ₃ ), and measured at 300 MHz using a nuclear magnetic resonance apparatus (manufactured by DIOL Co., Ltd.). From this result, it was confirmed that this white solid is an intermediate compound (RM1-A) represented by the following reaction formula. The yield was 92%.

¹ H-NMR (CDCl ₃ ) δ: 1.65 (m, 4H), 1.74 (m, 4H), 1.87 (m, 4H), 3.86 (m, 4H), 3.97 (m, 8H), 4.89 (t, 2H) ), 6.92 (m, 4H), 7.44 (m, 4H).

Next, in a 500 ml eggplant-shaped flask equipped with a cooling tube, 13.3 g (30 mmol) of the intermediate compound (RM1-A) obtained above, 11.6 g (70 mmol) of 2-(bromomethyl)acrylic acid, and 10% hydrochloric acid were placed. Aq) 50 ml, 160 ml of tetrahydrofuran (THF), and 13.2 g (70 mmol) of tin (II) chloride were mixed, and the mixture was stirred at 70 ° C for 20 hours to cause a reaction. After completion of the reaction, the reaction mixture was filtered under reduced pressure, and then mixed with 200 ml of purified water, and 100 ml of dichloroform was added thereto to extract. The extraction was carried out 3 times.

Anhydrous magnesium sulfate was added to the organic layer which had been separated, and dried. The solvent was filtered off from the filtrate under reduced pressure to give a white solid. This solid was purified by recrystallization (hexane / chloroform = 2 / 1) to yield 9.4 g of white solid. The white solid obtained was measured by NMR in the same manner as above, and the polymerizable compound (RM1) represented by the following formula was confirmed for the white solid. The yield was 64%.

¹ H-NMR (CDCl ₃ ) δ: 1.69 (m, 12H), 2.61 (m, 2H), 3.09 (m, 2H), 4.40 (t, 4H), 4.57 (m, 2H), 5.64 (m, 2H) ), 6.24 (m, 2H), 6.92 (d, 4H), 7.45 (m, 4H).

RM2: a polymerizable compound represented by the following formula: 5,5'-(4,4'-(propane-2,2-diyl)bis(4,1-phenylene))bis(oxy)bis ( Pentane-5,1-diyl)bis(2-methacrylate)

RM2 was obtained according to the method described in JP-A-63-79853.

RM3: a polymerizable compound represented by the following formula: 5,5'-(4,4'-carbonylbis(4,1-phenylene)bis(oxy)) bis(pentane-5,1-diyl) ) bis(2-methacrylate)

Polymeric compound BP1 (4,4'-(4,4'-carbonyl bis(4,1-) according to International Publication No. 2012/133819 (Japanese Patent No. 2011-252101) The synthesis of phenyl)bis(oxy))bis(butane-4,1-diyl)bis(2-methacrylate)) gave RM3 by the following reaction.

Further, the molecular weight measurement conditions of the polymer (polyimine or polylysine) are as follows.

Device: SENSHU Scientific Co., Ltd. Normal temperature colloidal permeation chromatography (GPC) device (SSC-7200), Column: Shodex pipe column (KD-803, KD-805)

Column temperature: 50 ° C

Dissolution: N,N'-dimethylformamide (lithium bromide-hydrate (LiBr.H ₂ O) as an additive 30 mmol/L, phosphoric acid. Anhydrous crystal (o-phosphoric acid) 30 mmol/L, tetrahydrofuran ( THF) is 10ml/L)

Flow rate: 1.0ml/min

Standard sample for calibration line: TSK standard manufactured by TOSOH Polyethylene oxide (molecular weights of about 900,000, 150,000, 100,000, 30,000), and polyethylene glycol (molecular weight of about 12,000, 4,000, 1,000) manufactured by Polymer Laboratories.

Further, the ruthenium imidization ratio of polyimine was measured as follows. 20 mg of polyimine powder was placed in an NMR sample tube (NMR standard sample tube manufactured by Kusano Scientific Co., Ltd. 5) 1.0 ml of deuterated dimethylarylene (DMSO-d ₆ , 0.05% TMS mixture) was added, and it was completely dissolved by ultrasonic waves. This solution was measured for proton NMR at 500 MHz using a NMR measuring instrument (JNW-ECA500) manufactured by JEOL Ltd., Japan. The rate of ruthenium iodization determines the protons from the structure that does not change before and after the imidization, and the peak value of the proton and the proton peak from the NH group in the vicinity of 9.5 to 10.0 ppm. The integrated value is calculated by the following formula. Further, in the following formula, the proton peak product value from the NH group of the x-proline acid, the peak product integrated value of the y-based reference proton, and the α-poly-proline (the imidization ratio is 0%) The ratio of the number of protons of the reference proton to the NH group of valine.

醯 imidization rate (%) = (1-α.x/y) × 100

(Synthesis Example 1)

BODA (2.0 g, 8.0 mmol), p-PDA (0.87 g, 8.0 mmol), PCH (2.28 g, 6.0 mmol), BEM-S (1.59 g, 6.0 mmol) were mixed in NMP (27.6 g). After reacting at 80 ° C for 5 hours, CBDA (2.31 g, 11.8 mmol) and NMP (9.1 g) were added, and the mixture was reacted at 40 ° C for 10 hours to obtain a polyaminic acid solution. Here NMP was added to the amine acid solution (44 g), and the mixture was diluted to 6 mass%, and anhydrous acetic acid (4.96 g) and pyridine (15.39 g) as a ruthenium amide catalyst were added, and the mixture was reacted at 50 ° C for 3 hours. This reaction solution was poured into methanol (590 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (A). The polyimide imidization ratio of the polyimine was 60%, the number average molecular weight was 18,000, and the weight average molecular weight was 29,000.

To the obtained polyimine powder (A) (6.0 g), NMP (24.0 g) was added, and the mixture was stirred at room temperature for 5 hours to be dissolved. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (A1).

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM1 was added to 10.0 g of the liquid crystal alignment agent (A1), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (A2). .

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM2 was added to 10.0 g of the liquid crystal alignment agent (A1), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (A3). .

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to 10.0 g of the liquid crystal alignment agent (A1), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (A4). .

(Synthesis Example 2)

TCA (1.79 g, 8.0 mmol) and p-PDA (1.08 g, 10.0 mmol) gave DA-Col (2.09 g, 4.0 mmol), BEM-S (1.59 g, 6.0 mmol) was mixed with NMP (26.6 g), and after reacting at 80 ° C for 5 hours, CBDA (2.31 g, 11.8 mmol) and NMP (8.9 g) were added, and the reaction was carried out at 40 ° C for 10 hours. , to obtain a polyaminic acid solution. NMP was added to the polyamic acid solution (43 g), and the mixture was diluted to 6 mass%, and then anhydrous acetic acid (4.84 g) and pyridine (15.0 g) as a ruthenium amide catalyst were added, and the reaction was carried out at 50 ° C. 3 hours. This reaction solution was poured into methanol (570 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (B). The polyimide imidization ratio of this polyimine was 60%, the number average molecular weight was 21,000, and the weight average molecular weight was 31,000.

To the obtained polyimine powder (B) (6.0 g), NMP (24.0 g) was added, and the mixture was stirred at room temperature for 5 hours to dissolve. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (B1).

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to 10.0 g of the liquid crystal alignment agent (B1), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (B2). .

(Synthesis Example 3)

BODA (2.50 g, 10.0 mmol), DADPA (1.99 g, 10.0 mmol), m-PDA (0.65 g, 6.0 mmol), PCH (1.52 g, 4.0 mmol) were mixed in NMP (25.4 g) at 80 ° C After reacting for 5 hours, CBDA (2.31 g, 11.8 mmol) and NMP (8.5 g) were added, and the mixture was reacted at 40 ° C for 10 hours to obtain a polyaminic acid solution. Here NMP was added to the amine acid solution (41 g), and the mixture was diluted to 6 mass%, and anhydrous acetic acid (4.94 g) and pyridine (15.32 g) as a ruthenium catalyst were added, and the mixture was reacted at 50 ° C for 3 hours. This reaction solution was poured into methanol (550 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (C). The polyamidimide had a hydrazine imidation ratio of 50%, a number average molecular weight of 16,000, and a weight average molecular weight of 21,000.

To the obtained polyimine powder (C) (6.0 g), NMP (24.0 g) was added, and the mixture was stirred at room temperature for 5 hours to dissolve. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (C1).

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (C1) were mixed to obtain a liquid crystal alignment agent (C2). To the liquid crystal alignment agent (C2), 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added, and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (C3).

(Synthesis Example 4)

BODA (2.50 g, 10.0 mmol), DAD PA (1.99 g, 10.0 mmol), BEM-S (1.59 g, 6.0 mmol), PCH (1.52 g, 4.0 mmol) were mixed in NMP (28.2 g) at 80 After reacting for 5 hours at ° C, CBDA (1.80 g, 9.2 mmol) and NMP (9.41 g) were added, and the mixture was reacted at 40 ° C for 10 hours to obtain a polyaminic acid solution. NMP was added to the polyamic acid solution (46 g), diluted to 6 mass%, and then added. Anhydrous acetic acid (4.99 g) and pyridine (15.48 g) as a ruthenium amide catalyst were reacted at 50 ° C for 3 hours. This reaction solution was poured into methanol (610 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (D). The polyimide imidization ratio of this polyimine was 50%, the number average molecular weight was 17,000, and the weight average molecular weight was 27,000.

To the obtained polyimine powder (D) (6.0 g), NMP (24.1 g) was added, and the mixture was stirred at room temperature for 5 hours to dissolve. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (D1).

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (D1) were mixed to obtain a liquid crystal alignment agent (D2). 60 mg (10% by mass of the solid content) of the polymerizable compound RM1 was added to the liquid crystal alignment agent (D2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (D3).

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM2 was added to the liquid crystal alignment agent (D2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (D4).

In addition, 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to the liquid crystal alignment agent (D2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (D5).

(Synthesis Example 5)

BODA (2.50g, 10.0mmol), DBA (1.52g, 10.0 mmol), m-PDA (0.65 g, 6.0 mmol), and PCH (1.52 g, 4.0 mmol) were mixed with NMP (24.2 g), and reacted at 80 ° C for 5 hours, then CBDA (1.88 g, 9.6 mmol) was added. With NMP (8.08 g), it was reacted at 40 ° C for 10 hours to obtain a polyaminic acid solution. NMP was added to the polyamic acid solution (39 g), and after diluting to 6 mass%, anhydrous acetic acid (4.93 g) and pyridine (15.28 g) as a ruthenium amide catalyst were added, and the reaction was carried out at 50 ° C. hour. This reaction solution was poured into methanol (520 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (E). The polyimide imidization ratio of this polyimine was 50%, the number average molecular weight was 19,000, and the weight average molecular weight was 34,000.

To the obtained polyimine powder (E) (6.0 g), NMP (24.0 g) was added, and the mixture was stirred at room temperature for 5 hours to dissolve. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (E1).

Further, 3.0 g of the liquid crystal alignment agent (A1) and 70 g of the liquid crystal alignment agent (E1) were mixed to obtain a liquid crystal alignment agent (E2). 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to the liquid crystal alignment agent (E2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (E3).

Further, 3.0 g of the liquid crystal alignment agent (B1) and 7.0 g of the liquid crystal alignment agent (E1) were mixed to obtain a liquid crystal alignment agent (E4). To the liquid crystal alignment agent (E4), 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added, and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent. (E5).

(Synthesis Example 6)

BODA (2.50 g, 10.0 mmol), DBA (1.52 g, 10.0 mmol), BEM-S (1.59 g, 6.0 mmol), PCH (1.52 g, 4.0 mmol) were mixed in NMP (27.04 g) at 80 ° C After reacting for 5 hours, CBDA (1.88 g, 9.6 mmol) and NMP (9.01 g) were added, and the mixture was reacted at 40 ° C for 10 hours to obtain a polyaminic acid solution. NMP was added to the polyamic acid solution (44 g), and the mixture was diluted to 6 mass%, and then anhydrous acetic acid (4.6 g) and pyridine (14.25 g) as a ruthenium catalyst were added, and the reaction was carried out at 50 ° C. 3 hours. This reaction solution was poured into methanol (600 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100 ° C to obtain a polyimine powder (F). The polyimide imidization ratio of this polyimine was 50%, the number average molecular weight was 21,000, and the weight average molecular weight was 48,000.

To the obtained polyimine powder (F) (6.0 g), NMP (24.0 g) was added, and the mixture was stirred at room temperature for 5 hours to dissolve. NMP (40.0 g) and BCS (30.0 g) were added to the solution, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (F1).

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (F1) were mixed to obtain a liquid crystal alignment agent (F2). To the liquid crystal alignment agent (F2), 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added, and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (F3).

Further, 3.0 g of the liquid crystal alignment agent (B1) and 7.0 g of the liquid crystal alignment agent (F1) were mixed to obtain a liquid crystal alignment agent (F4). To the liquid crystal alignment agent (F4), 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added, and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (F5).

(Synthesis Example 7)

DBA (3.04 g, 20.0 mmol) was dissolved in NMP (20.66 g), and CBDA (3.84 g, 19.6 mmol) and NMP (6.89 g) were added, and the mixture was reacted at room temperature for 10 hours to obtain a polyaminic acid solution. To the polyamic acid solution (34 g), NMP (45.9 g) and BCS (34.4 g) were added, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (G1). The polyamine has a number average molecular weight of 16,000 and a weight average molecular weight of 20,000.

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (G1) were mixed to obtain a liquid crystal alignment agent (G2). 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to the liquid crystal alignment agent (G2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (G3).

(Synthesis Example 8)

DBA (2.13 g, 14.0 mmol) and PCH (2.28 g, 6.0 mmol) were dissolved in NMP (24.77 g), and CBDA (3.84 g, 19.6 mmol) and NMP (8.26 g) were added and reacted at room temperature. After 10 hours, a polyaminic acid solution was obtained. To the polyamic acid solution (40.0 g), NMP (55.1 g) and BCS (41.3 g) were added, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (H1). The polyamine has a number average molecular weight of 17,000 and a weight average molecular weight of 23,000.

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (H1) were mixed to obtain a liquid crystal alignment agent (H2). To the liquid crystal alignment agent (H2), 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added, and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (H3).

(Synthesis Example 9)

DBA (2.13 g, 14.0 mmol) and BEM-S (1.59 g, 6.0 mmol) were dissolved in NMP (22.68 g), and CBDA (3.84 g, 19.6 mmol) and NMP (7.56 g) were added and allowed to stand at room temperature. The reaction was carried out for 10 hours to obtain a polyaminic acid solution. To the polyamic acid solution (37 g), NMP (50.39 g) and BCS (37.8 g) were added, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (I1). The polyamine has a number average molecular weight of 19000 and a weight average molecular weight of 24,000.

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (I1) were mixed to obtain a liquid crystal alignment agent (I2). 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to the liquid crystal alignment agent (I2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (I3).

(Synthesis Example 10)

DBA (1.22 g, 8.0 mmol), 3AMPDA (1.45 g, 6.0 mmol), BEM-S (1.59 g, 6.0 mmol) were dissolved in NMP (24.3 g), and CBDA (3.84 g, 19.6 mmol) and NMP ( 8.1 g) was allowed to react at room temperature for 10 hours to obtain a polyaminic acid solution. To the polyamic acid solution (39 g), NMP (54.0 g) and BCS (40.5 g) were added, and the mixture was stirred at room temperature for 5 hours to obtain a liquid crystal alignment agent (J1). The polyamine has a number average molecular weight of 12,000 and a weight average molecular weight of 17,000.

Further, 3.0 g of the liquid crystal alignment agent (A1) and 7.0 g of the liquid crystal alignment agent (J1) were mixed to obtain a liquid crystal alignment agent (J2). 60 mg (10% by mass of the solid content) of the polymerizable compound RM3 was added to the liquid crystal alignment agent (J2), and the mixture was stirred at room temperature for 3 hours to dissolve the liquid crystal alignment agent (J3).

<Production of liquid crystal cell> (Example 1)

Using the liquid crystal alignment agent (D3) obtained in Synthesis Example 4, the production of the liquid crystal cell was carried out in the order shown below. The liquid crystal alignment agent (D3) obtained in Synthesis Example 4 was spin-coated on an ITO surface of an ITO electrode substrate having a pixel size of 100 μm × 300 μm and an ITO electrode pattern having a line/pitch of 5 μm, and heated at 80 ° C. After drying the plate for 90 seconds, it was baked in a hot air circulating oven at 200 ° C for 30 minutes to form a liquid crystal alignment film having a film thickness of 100 nm.

Further, the liquid crystal alignment agent (D3) was spin-coated on the ITO surface on which the electrode pattern was not formed, and dried on a hot plate at 80 ° C for 90 seconds, and then fired in a hot air circulating oven at 200 ° C for 30 minutes to form a film. A liquid crystal alignment film having a thickness of 100 nm.

The two substrates described above were spread on a liquid crystal alignment film of a substrate by a bead interval of 6 μm, and then a sealant (XN-1500T manufactured by Kyoritsu Chemical Co., Ltd.) was printed thereon. Next, the surface on the side where the other substrate is formed with the liquid crystal alignment film is placed inside, and after bonding to the immediately adjacent substrate, the sealant is cured to form an empty cell. A negative liquid crystal (MLC-6608) was injected into the empty cell by a vacuum injection method, and realignment treatment was performed at 120 ° C for 1 hour to prepare a liquid crystal cell 1.

The response speed of the obtained liquid crystal cell 1 was measured by the following method. Thereafter, in a state where a voltage of 20 Vp-p is applied to the liquid crystal cell 1, a UV of 20 J through a 365 nm band pass filter is irradiated from the outside of the liquid crystal cell 1. Thereafter, the response speed was measured again, and the response speed before and after the UV irradiation was compared. The results are shown in Table 2.

Further, the liquid crystal alignment agent (D3) was spin-coated on the ITO surface on which the electrode pattern was not formed, and dried on a hot plate at 80 ° C for 90 seconds, and then fired in a hot air circulating oven at 200 ° C for 30 minutes to form a film. A liquid crystal alignment film substrate having a thickness of 100 nm was prepared, and two of the above-mentioned substrates were prepared, and a 6 μm bead interval was spread on a liquid crystal alignment film of a substrate, and then a sealant (XN-1500T manufactured by Kyoritsu Chemical Co., Ltd.) was printed thereon. Next, the surface on the side where the other substrate is formed with the liquid crystal alignment film is placed inside, and after bonding to the immediately adjacent substrate, the sealant is cured to form an empty cell. Negative liquid crystal is injected into the empty cell by a vacuum injection method (MLC-6608), re-alignment treatment was carried out at 120 ° C for 1 hour to prepare a liquid crystal cell. From the outside of the liquid crystal cell, 20 J was irradiated through the UV of a 365 nm band pass filter to make it a liquid crystal cell 2.

"Method for measuring response speed"

First, in the measuring device comprising a group of polarizing plates and a light quantity detector in a state of backlighting and crossed prismatic crystals, the liquid crystal cell 1 produced above is disposed between a group of polarizing plates. . At this time, the pattern of the wire/spaced ITO electrode was formed at an angle of 45° to the crossed Nicoles. Further, a rectangular wave having a voltage of ±4 V and a frequency of 1 kHz is applied to the liquid crystal cell 1 described above, and a change in saturation of the luminance observed by the light amount detector is presented to the oscilloscope, and the luminance when the voltage is not applied is 0. %, a voltage of ±4V is applied, so that the value of the saturation brightness is 100%, and the time required for the brightness to change from 10% to 90% is the response speed.

"Evaluation of residual DC voltage"

The liquid crystal cell 2 manufactured as described above was applied at a temperature of 23 ° C for 30 hours to make a rectangular wave of 30 Hz and 2.8 Vpp which were overlapped by a direct current of 2 V, and the DC voltage was cut off by a flash erasing method and immediately remained in the liquid crystal cell 2 . Voltage (residual DC voltage). This value is used as an index of afterimage characteristics. When the value is approximately 50 mV or less, the afterimage characteristics are good.

(Example 2)

In addition to using liquid crystal alignment agent (D4) instead of liquid crystal alignment agent Other than (D3), the same operation as in Example 1 was carried out, and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Example 3)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (D5) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 1)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (C3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 2)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (E3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Example 4)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (F3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 3)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (G3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 4)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (H3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Example 5)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (I3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Example 6)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (J3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 5)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (A2) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 6)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (A3) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 7)

The same operation as in Example 1 was carried out except that the liquid crystal alignment agent (A4) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

(Comparative Example 8)

The same operation as in Example 1 was carried out, except that the liquid crystal alignment agent (B2) was used instead of the liquid crystal alignment agent (D3), and the response speed before and after the UV irradiation was compared, and the residual DC voltage was measured.

As shown in Table 2, in Examples 1 to 6 including all of the components (A), (B), and (C), the response speed was sufficiently improved, and accumulation of residual DC voltage was suppressed. On the other hand, in Comparative Examples 5 to 8, although the response speed was sufficiently improved, the residual DC voltage was easily accumulated. Further, in Comparative Examples 1 to 4, the accumulation of the residual DC voltage was suppressed, but the response speed was hard to be improved.

Claims (7)

A liquid crystal alignment agent comprising the following (A) component, (B) component, (C) component, and an organic solvent; (A) component: having a side chain having a liquid crystal perpendicularly aligned and containing a methyl group At least one photoreactive side chain polyimine precursor selected from the group consisting of acrylic acid, acrylic acid, vinyl, allyl, coumarinyl, styryl and cinnamyl, and At least one polymer selected from the polyimide precursor obtained by imidization of an amine precursor, (B) component: a polymerizable compound having a photopolymerization or photocrosslinking group at one or more terminals, and (C) component : by a diamine having a photoreactive side chain having at least one selected from a methacrylic group, an acryl group, a vinyl group, an allyl group, a coumarin group, a styryl group, and a cinnamyl group, and a polyimine precursor obtained by reacting at least one diamine selected from the following formulas (C-1) to (C-5) with a tetracarboxylic dianhydride, and a polyimide precursor prepared by the reaction At least one polymer selected from the polyimine obtained by imidization; (wherein Y ₁ represents a secondary amine, a tertiary amine, or an organic group having a monovalent structure of a heterocyclic structure, Y ₂ represents a secondary amine, a tertiary amine, or a divalent organic group having a heterocyclic structure) . The liquid crystal alignment agent of claim 1, wherein the photoreactive side chain system comprises a group selected from the following formula (I). (wherein R ¹¹ is H or methyl). The liquid crystal alignment agent of claim 1, wherein the photopolymerization or photocrosslinking basis is selected by the following formula (II), (wherein R ¹² is H or an alkyl group having 1 to 4 carbon atoms; and Z ¹ is a divalent aromatic ring or a hetero group substituted by an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms; The ring and the Z ² system may be a monovalent aromatic ring or a heterocyclic ring substituted with an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms. The liquid crystal alignment agent according to claim 1, wherein the component (C) is a formula (C-1) to (10-1% to 80 mol% of the total diamine component using the raw material of the component (C). C-5) Polycondensate obtained from the selected diamine An imine precursor, and a polymer selected from the polyimine obtained by imidating the polyimine precursor ruthenium. A liquid crystal alignment film which is obtained by applying a liquid crystal alignment agent according to any one of claims 1 to 4 to a substrate and baking it. A liquid crystal display device characterized by comprising a liquid crystal cell, wherein the liquid crystal cell is brought into contact with a liquid crystal alignment agent according to any one of claims 1 to 4, which is applied to a substrate and fired to obtain a liquid crystal alignment. A liquid crystal layer is provided on the film, and a liquid crystal cell produced by irradiating ultraviolet rays while applying a voltage to the liquid crystal layer is provided. A method for producing a liquid crystal display device, characterized in that a liquid crystal layer is provided in contact with a liquid crystal alignment film obtained by applying a liquid crystal alignment agent according to any one of claims 1 to 4 to a substrate and firing the liquid crystal alignment film, and This liquid crystal layer is irradiated with ultraviolet rays while applying a voltage to produce a liquid crystal cell.