WO2014178407A1

WO2014178407A1 - Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element

Info

Publication number: WO2014178407A1
Application number: PCT/JP2014/062010
Authority: WO
Inventors: 保坂　和義; 徳俊三木; 橋本　淳; 暁子若林
Original assignee: 日産化学工業株式会社
Priority date: 2013-05-01
Filing date: 2014-04-30
Publication date: 2014-11-06
Also published as: TW201512158A; CN105359033A; JP6281568B2; CN105359033B; KR20160003120A; JPWO2014178407A1; TWI623518B; KR102135493B1

Abstract

Provided is a liquid crystal alignment agent capable of forming a liquid crystal alignment film with which adhesive properties between a sealant and the liquid crystal alignment film can be improved, the occurrence of display unevenness in the vicinity of a frame of an element can be inhibited, even under high-temperature/high-humidity conditions, and a reduction in voltage retention rate can be inhibited. This liquid crystal alignment agent includes: (A) a component including a compound represented by formula [1] (in formula [1]: X¹ represents either a divalent organic group having a C1-20 aliphatic hydrocarbon group, or a C6-24 divalent organic group having a benzene ring or a cyclohexane ring; and X² is selected from formulae [1-1] to [1-5]) (in formula [1-3], W¹ represents hydrogen or a benzene ring); and (B) a component including at least one polymer selected from the group consisting of polyimide precursors and polyimides obtained by causing a reaction between a diamine component and a tetracarboxylic acid component.

Description

Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element

The present invention relates to a liquid crystal alignment treatment agent used in the production of a liquid crystal display element, a liquid crystal alignment film obtained from the liquid crystal alignment treatment agent, and a liquid crystal display element having the liquid crystal alignment film.

A film made of an organic material such as a polymer material has been widely used as an interlayer insulating film or a protective film in the electronic device field because of its ease of formation and insulation performance. Among them, in a liquid crystal display element well known as a display device, an organic film made of polyimide is used as a liquid crystal alignment film.

The liquid crystal alignment film is used for the purpose of controlling the alignment state of the liquid crystal. Recently, along with the higher definition of liquid crystal display elements, there has been a demand for suppression of display defects due to a decrease in contrast of liquid crystal display elements and long-term use.

In response to these problems, when polyimide is used as the liquid crystal alignment film, a liquid crystal alignment treatment agent to which an alkoxysilane compound is added as a technique for improving liquid crystal alignment and making display defects less likely to occur at the periphery of the liquid crystal display screen. There has been proposed a liquid crystal alignment film formed by using (see, for example, Patent Document 1 or 2).

Japanese Unexamined Patent Publication No. 61-171762 Japanese Unexamined Patent Publication No. 11-119226

In recent years, liquid crystal display elements have been used for mobile applications such as smartphones and mobile phones. In these applications, in order to secure as many display surfaces as possible, it is necessary to make the width of the sealing agent used for bonding the substrates of the liquid crystal display elements narrower than in the past. Furthermore, for the reasons described above, it is also required that the drawing position of the sealing agent be a position in contact with the end portion of the liquid crystal alignment film having low adhesiveness with the sealing agent or an upper portion of the liquid crystal alignment film. In such a case, use under high-temperature and high-humidity conditions makes it easy for water to enter the liquid crystal display element from between the sealant and the liquid crystal alignment film, resulting in display unevenness near the frame of the liquid crystal display element. End up.

In addition, when water is mixed into the liquid crystal display element, the voltage holding ratio, which is one of the electrical characteristics of the liquid crystal display element, is greatly reduced, and a burn-in defect (also called line burn-in), which is one of the display defects of the liquid crystal display element. As a result, the liquid crystal display element with high reliability cannot be obtained.

Accordingly, an object of the present invention is to combine the above characteristics, improve the adhesion between the sealing agent and the liquid crystal alignment film, suppress the occurrence of display unevenness near the frame of the liquid crystal display element under high temperature and high humidity conditions, and maintain the voltage holding ratio. It is providing the liquid crystal aligning agent which can provide the liquid crystal aligning film which can suppress the fall of this, and the liquid crystal display element which has the said liquid crystal aligning film.

As a result of diligent research, the present inventor has achieved the above object by a liquid crystal aligning agent containing a compound having a specific structure and at least one polymer selected from the group consisting of a polyimide precursor and a polyimide. The present invention was found to be extremely effective in order to accomplish the present invention.

That is, the present invention has the following gist.
(1) A liquid crystal aligning agent comprising the following component (A) and component (B).
(A) Component: A compound represented by the following formula [1].
(B) component: At least 1 type of polymer chosen from the group which consists of a polyimide precursor obtained by making a diamine component and a tetracarboxylic-acid component react, and a polyimide.

(X ¹ represents a divalent organic group having an aliphatic hydrocarbon group having 1 to 20 carbon atoms, or a divalent organic group having 6 to 24 carbon atoms having a benzene ring or a cyclohexane ring, and X ² represents A structure selected from the following formulas [1-1] to [1-5] is shown.)

(W ¹ represents a hydrogen atom or a benzene ring.)

(2) The liquid crystal aligning agent according to the above (1), wherein X ^{1 in the} formula [1] is an alkylene group having 1 to 10 carbon atoms.
(3) X ^{2 in} the formula [1] is a structure selected from the formula [1-1], the formula [1-2] and the formula [1-4], according to the above (1) or (2) Liquid crystal alignment treatment agent.

(4) The diamine component in the polymer of the component (B) includes at least one diamine compound having a structure represented by the following formula [2], according to any one of the above (1) to (3) Liquid crystal alignment treatment agent.

(Y represents a substituent having a structure selected from the following formulas [2-1] to [2-6], and m represents an integer of 1 to 4.)

(A represents an integer of 0 to 4, and b represents an integer of 0 to 4.
Y ¹ represents a single bond, — (CH ₂ ) _a — (a is an integer of 1 to 15), —O—, —CH ₂ O—, —COO— or OCO—, and Y ² represents a single bond or — (CH ₂ ) _b — (b is an integer of 1 to 15), Y ³ is a single bond, — (CH ₂ ) _c — (c is an integer of 1 to 15), —O—, —CH ₂ O—, —COO— or —OCO—, wherein Y ⁴ is a divalent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocyclic ring, or a divalent divalent group having 12 to 25 carbon atoms having a steroid skeleton. An organic group, and an arbitrary hydrogen atom on the cyclic group includes an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, a fluorine-containing alkyl group having 1 to 3 carbon atoms, and 1 to 3 carbon atoms may be substituted with a fluorine-containing alkoxyl group or a fluorine atom, Y ⁵ is a benzene ring, a cycloalkyl A divalent cyclic group selected from a xanth ring and a heterocyclic ring, and any hydrogen atom on these cyclic groups is an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, or 1 to 3 carbon atoms; 3 is a fluorine-containing alkyl group, may be substituted with a fluorine-containing alkoxyl group having 1 to 3 carbon atoms or a fluorine atom, n is an integer of 0 to 4, Y ⁶ is an alkyl group having 1 to 18 carbon atoms, A fluorine-containing alkyl group having 1 to 18 carbon atoms, an alkoxyl group having 1 to 18 carbon atoms or a fluorine-containing alkoxyl group having 1 to 18 carbon atoms;
Y ⁷ represents —O—, —CH ₂ O—, —COO—, —OCO—, —CONH— or —NHCO—, and Y ⁸ represents an alkyl group having 8 to 22 carbon atoms.
Y ⁹ and Y ¹⁰ each independently represent a hydrocarbon group having 1 to 12 carbon atoms, and Y ¹¹ represents an alkyl group having 1 to 5 carbon atoms. )

(5) The liquid crystal aligning agent according to any one of the above (1) to (4), wherein the tetracarboxylic acid component in the polymer of the component (B) contains a compound represented by the following formula [3].

(Z ¹ is a group having a structure selected from the following formulas [3a] to [3j].)

(Z ² to Z ⁵ represent a hydrogen atom, a methyl group, a chlorine atom or a benzene ring, and may be the same or different, and Z ⁶ and Z ⁷ represent a hydrogen atom or a methyl group, and each represents the same. Or different.)
(6) The liquid crystal aligning agent according to any one of (1) to (5), wherein the polymer of the component (B) is a polyimide obtained by dehydrating and ring-closing polyamic acid.
(7) The liquid crystal aligning agent according to any one of (1) to (6), wherein the component (A) is 0.1 to 30 parts by mass with respect to 100 parts by mass of the component (B).
(8) A liquid crystal alignment film obtained from the liquid crystal alignment treatment agent according to any one of (1) to (7).
(9) A liquid crystal alignment film obtained by an ink jet method using the liquid crystal alignment treatment agent according to any one of (1) to (7).
(10) A liquid crystal display device having the liquid crystal alignment film according to (8) or (9).

(11) A liquid crystal composition having a liquid crystal layer between a pair of substrates provided with electrodes and including a polymerizable compound that is polymerized by at least one of active energy rays and heat is disposed between the pair of substrates, The liquid crystal alignment film according to (8) or (9), which is used in a liquid crystal display device produced by polymerizing the polymerizable compound while applying a voltage between electrodes.
(12) A liquid crystal display device having the liquid crystal alignment film according to (11).

(13) A liquid crystal alignment layer having a liquid crystal layer between a pair of substrates provided with electrodes and including a polymerizable group that is polymerized by at least one of active energy rays and heat is disposed between the pair of substrates, The liquid crystal alignment film according to (8) or (9), which is used in a liquid crystal display device produced by polymerizing the polymerizable group while applying a voltage between electrodes.
(14) A liquid crystal display device having the liquid crystal alignment film according to (13).

According to the present invention, the liquid crystal alignment treatment agent containing a compound having a specific structure and at least one polymer selected from the group consisting of a polyimide precursor and a polyimide has an adhesive property between the sealant and the liquid crystal alignment film. Even under high temperature and high humidity conditions, it is possible to form a liquid crystal alignment film that can suppress the occurrence of display unevenness in the vicinity of the frame of the liquid crystal display element and suppress the decrease in voltage holding ratio. That is, a liquid crystal display element having a liquid crystal alignment film obtained from the liquid crystal alignment treatment agent of the present invention has excellent reliability and can be suitably used for a large-screen, high-definition liquid crystal television.

The present invention is a liquid crystal aligning agent containing the following components (A) and (B), a liquid crystal aligning film obtained using the liquid crystal aligning agent, and a liquid crystal display element having the liquid crystal aligning film. is there.
Component (A): a compound represented by the following formula [1] (also referred to as a specific compound).
Component (B): At least one polymer selected from the group consisting of a polyimide precursor obtained by reacting a diamine component and a tetracarboxylic acid component and a polyimide (also referred to as a specific polymer).

(W ¹ represents a hydrogen atom or a benzene ring).

In the liquid crystal aligning agent of the present invention, the O═C═N— group (also referred to as an isocyanate group) in the specific compound is a heating step for preparing the liquid crystal aligning agent or a baking step for preparing the liquid crystal aligning film. Therefore, it is considered that it is chemically bonded to the carboxyl group in the specific polymer. Therefore, in spite of the simple means of mixing in an organic solvent, the liquid crystal alignment treatment agent of the present invention efficiently binds the specific compound and the specific polymer in the liquid crystal alignment film obtained therefrom. I think.
In addition, it is known that the double bond site of the formula [1-1] to the formula [1-5] which is X ² in the specific compound reacts when irradiated with heat or ultraviolet rays. Further, these double binding sites are sites that are also included in the compound contained in the sealant.

Therefore, when the liquid crystal alignment treatment agent of the present invention is used, the double bond site in the liquid crystal alignment film and the sealant are obtained by the curing process of the sealant when producing the liquid crystal display element, that is, the ultraviolet irradiation process or the baking process. A chemical reaction with the compound therein causes a chemical bond between the sealing agent and the liquid crystal alignment film, thereby enhancing their adhesion.
In view of the above, the liquid crystal aligning agent containing the specific compound and specific polymer of the present invention has high adhesion to the sealant, and display irregularities near the frame of the liquid crystal display element even under high temperature and high humidity conditions. It is possible to form a liquid crystal alignment film that can suppress generation and suppress a decrease in voltage holding ratio.

<Specific compounds>
The specific compound of the present invention is a compound represented by the following formula [1].

(X ¹ and X ² have the same meaning as defined above, and X ² represents a structure selected from the following formulas [1-1] to [1-5].)

(W ¹ represents a hydrogen atom or a benzene ring.)

In the formula [1], X ¹ represents a divalent organic group having an aliphatic hydrocarbon group having 1 to 20 carbon atoms or a divalent organic group having 6 to 24 carbon atoms having a benzene ring or a cyclohexane ring. . Among these, from the viewpoint of availability and production of the compound, an alkylene group having 1 to 10 carbon atoms is preferable, and an alkylene group having 1 to 5 carbon atoms is more preferable.
In the formula [1], X ² is a structure selected from the formulas [1-1] to [1-5].
In formula [1-3], W ₁ represents a hydrogen atom or a benzene ring. Of these, a hydrogen atom is preferable.
In the formula [1], X ² is preferably a structure represented by the formula [1-1], the formula [1-2] or the formula [1-4] from the viewpoint of reactivity by heat or ultraviolet irradiation.

More specifically, structures represented by the following formulas [1a] to [1d] can be given.

(X ³ represents an alkylene group having 1 to 5 carbon atoms, a benzene ring or a cyclohexane ring, and X ⁴ represents an alkylene group having 1 to 5 carbon atoms, a benzene ring or a cyclohexane ring.)

(X ⁵ represents an alkylene group having 1 to 5 carbon atoms, a benzene ring or a cyclohexane ring, and X ⁶ represents an alkylene group having 1 to 5 carbon atoms, a benzene ring or a cyclohexane ring.)

<Specific polymer>
The specific polymer which is the component (B) of the present invention is at least one polymer selected from the group consisting of a polyimide precursor obtained by reacting a diamine component and a tetracarboxylic acid component and a polyimide.

The polyimide precursor has a structure represented by the following formula [A].

(R ¹ is a tetravalent organic group, R ² is a divalent organic group, A ¹ and A ² represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, which may be the same or different. A ³ and A ⁴ may represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or an acetyl group, and may be the same or different, and n represents a positive integer.)

The diamine component is a diamine compound having two primary or secondary amino groups in the molecule, and the tetracarboxylic acid component is a tetracarboxylic acid compound, tetracarboxylic dianhydride, or tetracarboxylic acid dihalide compound. , Tetracarboxylic acid dialkyl ester compounds or tetracarboxylic acid dialkyl ester dihalide compounds.

The specific polymer can be obtained relatively easily by using a tetracarboxylic dianhydride represented by the following formula [B] and a diamine compound represented by the following formula [C] as raw materials. The polyamic acid consisting of the structural formula of the repeating unit represented by the formula [D] or a polyimide obtained by imidizing the polyamic acid is preferable.

(R ¹ and R ² are the same as defined in formula [A]).

(R ¹ and R ² are the same as defined in formula [A]).

In addition, the polymer of the formula [D] obtained above by the usual synthesis method is added to the alkyl group having 1 to 8 carbon atoms of A ¹ and A ^{2 represented by} the formula [A] and the formula [A]. It is also possible to introduce an alkyl group having 1 to 5 carbon atoms or an acetyl group of A ³ and A ⁴ shown.

<Diamine component>
As the diamine component for producing the specific polymer as the component (B), a known diamine compound can be used.
Among these, it is preferable to use at least one diamine compound (also referred to as a specific diamine compound) having a structure represented by the following formula [2].

In the formula [2-1], a represents an integer of 0 to 4. Among these, 0 or 1 is preferable from the viewpoint of availability of raw materials and ease of synthesis.
In the formula [2-2], b represents an integer of 0 to 4. Especially, the integer of 0 or 1 is preferable from the point of the availability of a raw material or the ease of a synthesis | combination.
In formula [2-3], Y ¹ is a single bond, — (CH ₂ ) _a — (a is an integer of 1 to 15), —O—, —CH ₂ O—, —COO— or —OCO—. Indicates. Among these, from the viewpoint of availability of raw materials and ease of synthesis, a single bond, — (CH ₂ ) _a — (a is an integer of 1 to 15), —O—, —CH ₂ O— or —COO. -Is preferred. More preferred is a single bond, — (CH ₂ ) _a — (a is an integer of 1 to 10), —O—, —CH ₂ O— or COO—.

In the formula [2-3], Y ² represents a single bond or — (CH ₂ ) _b — (b is an integer of 1 to 15). Among these, a single bond or — (CH ₂ ) _b — (b is an integer of 1 to 10) is preferable.
In the formula [2-3], Y ³ is a single bond, — (CH ₂ ) _c — (c is an integer of 1 to 15), —O—, —CH ₂ O—, —COO— or —OCO—. Indicates. Of these, a single bond, — (CH ₂ ) _c — (c is an integer of 1 to 15), —O—, —CH ₂ O— or —COO— is preferable from the viewpoint of ease of synthesis. More preferred is a single bond, — (CH ₂ ) _c — (c is an integer of 1 to 10), —O—, —CH ₂ O— or —COO—.

In the formula [2-3], Y ⁴ is a divalent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocyclic ring, and any hydrogen atom on these cyclic groups is an alkyl group having 1 to 3 carbon atoms. , An alkoxyl group having 1 to 3 carbon atoms, a fluorine-containing alkyl group having 1 to 3 carbon atoms, a fluorine-containing alkoxyl group having 1 to 3 carbon atoms, or a fluorine atom. Furthermore, Y ⁴ may be a divalent organic group selected from organic groups having 12 to 25 carbon atoms having a steroid skeleton. Of these, an organic group having 12 to 25 carbon atoms having a benzene ring, a cyclohexane ring or a steroid skeleton is preferable from the viewpoint of ease of synthesis.

In the formula [2-3], Y ⁵ represents a divalent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocyclic ring, and any hydrogen atom on these cyclic groups is an alkyl group having 1 to 3 carbon atoms. , An alkoxyl group having 1 to 3 carbon atoms, a fluorine-containing alkyl group having 1 to 3 carbon atoms, a fluorine-containing alkoxyl group having 1 to 3 carbon atoms, or a fluorine atom. Of these, a benzene ring or a cyclohexane ring is preferable.
In the formula [2-3], n represents an integer of 0 to 4. Among these, 0 to 3 are preferable from the viewpoint of availability of raw materials and ease of synthesis. More preferred is 0-2.

In the formula [2-3], Y ⁶ represents an alkyl group having 1 to 18 carbon atoms, a fluorine-containing alkyl group having 1 to 18 carbon atoms, an alkoxyl group having 1 to 18 carbon atoms, or a fluorine-containing alkoxyl group having 1 to 18 carbon atoms. Indicates. Of these, an alkyl group having 1 to 18 carbon atoms, a fluorine-containing alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 18 carbon atoms, or a fluorine-containing alkoxyl group having 1 to 10 carbon atoms is preferable. More preferably, it is an alkyl group having 1 to 12 carbon atoms or an alkoxyl group having 1 to 12 carbon atoms. Particularly preferred is an alkyl group having 1 to 9 carbon atoms or an alkoxyl group having 1 to 9 carbon atoms.

As a preferable combination of Y ¹ , Y ² , Y ³ , Y ⁴ , Y ⁵ , Y ⁶ and n in the formula [2-3] for constituting the substituent Y in the formula [2], International Publication WO2011 / 132751 (published 2011.10.27), the same combinations as (2-1) to (2-629) listed in Tables 6 to 47 on pages 13 to 34 are mentioned. It should be noted that Y1 to Y6 in each table of the International Publication are replaced with Y ¹ to Y ⁶ of the present invention.
In the formula [2-4], Y ⁷ represents —O—, —CH ₂ O—, —COO—, —OCO—, —CONH— or —NHCO—. Of these, —O—, —CH ₂ O—, —COO— or —CONH— is preferable. More preferred is —O—, —COO— or —CONH—.
In formula [2-4], Y ⁸ represents an alkyl group having 8 to 22 carbon atoms.
In the formula [2-5], Y ⁹ and Y ¹⁰ independently represent a hydrocarbon group having 1 to 12 carbon atoms.
In formula [2-6], Y ¹¹ represents an alkyl group having 1 to 5 carbon atoms.

Although the method to manufacture the specific diamine compound shown by Formula [2] is not specifically limited, What is shown below is mentioned as a preferable method.
As an example, the specific diamine compound represented by the formula [2] can be obtained by synthesizing a dinitro compound represented by the following formula [2-A] and further reducing the nitro group to convert it to an amino group. .

(Y represents a substituent having a structure selected from the above formulas [2-1] to [2-6], and m represents an integer of 1 to 4.)

The method for reducing the dinitro group of the dinitro compound represented by the formula [2-A] is not particularly limited, and usually in a solvent such as ethyl acetate, toluene, tetrahydrofuran, dioxane, alcohol solvent, palladium-carbon, There is a method in which platinum oxide, Raney nickel, platinum black, rhodium-alumina, platinum sulfide carbon or the like is used as a catalyst and reacted in hydrogen gas, hydrazine or hydrogen chloride.

Specific examples of the specific diamine compound represented by the formula [2] are shown below, but are not limited to these examples.
Specific diamine compounds include 2,4-dimethyl-m-phenylenediamine, 2,6-diaminotoluene, 2,4-diaminobenzoic acid, 3,5-diaminobenzoic acid, 2,4-diaminophenol, 3,5 -Diaminophenol, 3,5-diaminobenzyl alcohol, 2,4-diaminobenzyl alcohol, 4,6-diaminoresorcinol, and diamines having structures represented by the following formulas [2-7] to [2-47] A compound can be mentioned.

(A ¹ represents an alkyl group having 1 to 22 carbon atoms or a fluorine-containing alkyl group.)

(R ¹ represents —O—, —OCH ₂ —, —CH ₂ O—, —COOCH ₂ — or —CH ₂ OCO—, and R ² represents an alkyl group having 1 to 22 carbon atoms, an alkoxy group, or a fluorine-containing alkyl. Group or fluorine-containing alkoxy group.)

(R ³ represents —COO—, —OCO—, —COOCH ₂ —, —CH ₂ OCO—, —CH ₂ O—, —OCH ₂ — or —CH ₂ —, and R ⁴ has 1 to 22 carbon atoms. Represents an alkyl group, an alkoxy group, a fluorine-containing alkyl group or a fluorine-containing alkoxy group.)

(R ⁵ is —COO—, —OCO—, —COOCH ₂ —, —CH ₂ OCO—, —CH ₂ O—, —OCH ₂ —, —CH ₂ — or —O—, and R ⁶ is a fluorine group , Cyano group, trifluoromethane group, nitro group, azo group, formyl group, acetyl group, acetoxy group or hydroxyl group.)

(R ⁷ represents an alkyl group having 3 to 12 carbon atoms. The cis-trans isomerism of 1,4-cyclohexylene is preferably a trans isomer.)

(R ⁸ represents an alkyl group having 3 to 12 carbon atoms. The cis-trans isomerism of 1,4-cyclohexylene is preferably a trans isomer.)

(B ⁴ represents an alkyl group having 3 to 20 carbon atoms which may be substituted with a fluorine atom, B ³ represents a 1,4-cyclohexylene group or a 1,4-phenylene group, and B ² represents an oxygen atom. Or —COO— * (where a bond marked with “*” is bonded to B ³ ), and B ¹ is an oxygen atom or —COO— * (where a bond marked with “*” is (CH ₂ ) is bonded to a ^{2. In} addition, a ¹ represents an integer of 0 or 1, a ² represents an integer of 2 to 10, and a ³ represents an integer of 0 or 1.)

Among the specific diamine compounds represented by the above formula [2], the liquid crystal alignment obtained from the specific polymer using the diamine compound having the structure in which the substituent Y in the formula [2] is represented by the formula [2-3] When the liquid crystal alignment film is formed using the treatment agent, the pretilt angle of the liquid crystal can be increased. In order to increase the pretilt angle, among the above diamine compounds, it is preferable to use diamine compounds represented by the formulas [2-25] to [2-40] or the formulas [2-43] to [2-47]. . More preferred are diamine compounds represented by the formulas [2-29] to [2-40] or the formulas [2-43] to [2-47].
The amount of the diamine compound used for increasing the pretilt angle is preferably 5 mol% or more and 80 mol% or less of the entire diamine component. More preferably, it is 5 mol% or more and 60 mol% of the whole diamine component from the viewpoint of the coating property of the liquid crystal aligning agent and the electric characteristics as the liquid crystal alignment film.

The specific diamine compound represented by the formula [2] has a solubility or coating property in a solvent of the specific polymer, liquid crystal alignment in the case of forming a liquid crystal alignment film, voltage holding ratio, accumulated charge, and other characteristics. One type or a mixture of two or more types can be used.
As the diamine component for producing the specific polymer, a diamine compound other than the specific diamine compound represented by the formula [2] (also referred to as other diamine compound) can be used as the diamine component. Specific examples of other diamine compounds are shown below, but are not limited to these examples.

For example, m-phenylenediamine, p-phenylenediamine, 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′-diamino Diphenylmethane, 3,3′-diaminodiphenylmethane, 3,4′-diaminodiphenylmethane, 2,2′-diaminodiphenylmethane, , 3'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 2,2'-diaminodiphenyl ether, 2,3'-diaminodiphenyl ether, 4,4 '-Sulfonyldianiline, 3,3'-sulfonyldianiline, bis (4-aminophenyl) silane, bis (3-aminophenyl) silane, dimethyl-bis (4-aminophenyl) silane, dimethyl-bis (3- Aminophenyl) silane, 4,4'-thiodianiline, 3,3'-thiodianiline, 4,4'-diaminodiphenylamine, 3,3'-diaminodiphenylamine, 3,4'-diaminodiphenylamine, 2,2'-diaminodiphenylamine 2,3'-Diaminodiphe Ruamine, N-methyl (4,4'-diaminodiphenyl) amine, N-methyl (3,4'-diaminodiphenyl) 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-diaminonaphthalene, 1,7-diaminonaphthalene, 1,8-diaminonaphthalene, 2,5 -Diaminonaphthalene, 2,6 diaminonaphthalene, 2,7-diaminonaphthalene, 2,8-diamidine Nonaphthalene, 1,2-bis (4-aminophenyl) ethane, 1,2-bis (3-aminophenyl) ethane, 1,3-bis (4-aminophenyl) propane, 1,3-bis (3- Aminophenyl) propane, 1,4-bis (4aminophenyl) butane, 1,4-bis (3-aminophenyl) butane, bis (3,5-diethyl-4-aminophenyl) methane, 1,4-bis (4-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) 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)] dianiline, 4,4'-[1,3 -Fe Renbis (methylene)] dianiline, 3,4 ′-[1,4-phenylenebis (methylene)] dianiline, 3,4 ′-[1,3-phenylenebis (methylene)] dianiline, 3,3 ′-[1 , 4-phenylenebis (methylene)] dianiline, 3,3 ′-[1,3-phenylenebis (methylene)] dianiline, 1,4-phenylenebis [(4-aminophenyl) methanone], 1,4-phenylene Bis [(3-aminophenyl) methanone], 1,3-phenylenebis [(4-aminophenyl) methanone], 1,3-phenylenebis [(3-aminophenyl) methanone], 1,4-phenylenebis ( 4-aminobenzoate), 1,4-phenylenebis (3-aminobenzoate), 1,3-phenylenebis (4-aminobenzoate), 1,3- Enylene bis (3-aminobenzoate), bis (4-aminophenyl) terephthalate, bis (3-aminophenyl) terephthalate, 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-phenylene) 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) isophthalamide, N, N′-bis (3-aminophenyl) iso Phthalamide, 9,10-bis (4-aminophenyl) anthracene, 4,4′-bis (4-aminophenoxy) diphenylsulfone, 2,2′-bis [4- (4-aminophenoxy) phenyl] propane, 2 , 2′-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane, 2,2′-bis (4-aminophenyl) hexafluoropropane, 2,2′-bis (3-aminophenyl) hexafluoro Propane, 2,2′-bis (3-amino-4-methylphenyl) hexafluoropropane, 2,2′-bis (4-aminophenyl) propane, 2,2′-bis (3-aminophenyl) propane, 2,2′-bis (3-amino-4-methylphenyl) propane, 1,3-bis (4-aminophenoxy) propane, 1,3-bis ( -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, , 7- (3-aminophenoxy) heptane, 1,8-bis (4-aminophenoxy) octane, 1,8-bis (3-aminophenoxy) octane, 1,9-bis (4-aminophenoxy) nonane, 1,9-bis (3-aminophenoxy) nonane, 1,10- (4-aminophenoxy) decane, 1,10- (3-aminophenoxy) decane, 1,11- 4-aminophenoxy) undecane, 1,11- (3-aminophenoxy) undecane, 1,12- (4-aminophenoxy) dodecane, 1,12- (3-aminophenoxy) dodecane, bis (4-aminocyclohexyl) Methane, bis (4-amino-3-methylcyclohexyl) methane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, 1,7-diaminoheptane 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane, and the like.

Examples of other diamine compounds include those having an alkyl group, a fluorine-containing alkyl group, an aromatic ring, an aliphatic ring or a heterocyclic ring in the diamine side chain, and those having a macrocyclic substituent composed of these groups. You can also. Specifically, diamine compounds represented by the following formulas [DA1] to [DA7] can be exemplified.

(A ¹ represents —COO—, —OCO—, —CONH—, —NHCO—, —CH ₂ —, —O—, —CO— or —NH—, and A ² represents a straight chain having 1 to 22 carbon atoms. A linear or branched alkyl group or a linear or branched fluorine-containing alkyl group having 1 to 22 carbon atoms.)

(P represents an integer of 1 to 10)

As long as the effects of the present invention are not impaired, diamine compounds represented by the following formulas [DA8] to [DA13] can also be used as other diamine compounds.

(M represents an integer of 0 to 3, and n represents an integer of 1 to 5.)

Furthermore, as long as the effects of the present invention are not impaired, diamine compounds represented by the following formulas [DA14] to [DA17] can also be used.

(A ¹ is a single bond, —CH ₂ —, —C ₂ H ₄ —, —C (CH ₃ ) ₂ —, —CF ₂ —, —C (CF ₃ ) ₂ —, —O—, —CO—, —NH—, —N (CH ₃ ) —, —CONH—, —NHCO—, —CH ₂ O—, —OCH ₂ —, —COO—, —OCO—, —CON (CH ₃ ) — or —N ( CH ₃ ) CO—, m ¹ and m ² each represents an integer of 0 to 4, and m ¹ + m ² represents an integer of 1 to 4, and in the formula [DA15], m ³ and m ⁴ are each In the formula [DA16], A ² represents a linear or branched alkyl group having 1 to 5 carbon atoms, m ⁵ represents an integer of 1 to 5, A ³ represents a single bond, _{_{_{_{CH 2 -, - C 2 H}}}} 4 -, - C (CH 3) 2 -, - CF 2 -, - C (CF 3) 2 -, - O -, - CO -, - NH -, - N ( _{_{H 3) -, - CONH -}} , - NHCO -, - CH 2 O -, - OCH 2 -, - COO -, - OCO -, - CON (CH 3) - or -N _(CH 3) CO- are shown M ⁶ represents an integer of 1 to 4.)
Furthermore, as other diamine compounds, diamine compounds represented by the following formulas [DA18] and [DA19] can also be used.

Furthermore, a diamine compound represented by the following formula [DA20] can also be used as long as the effects of the present invention are not impaired.

(A ¹ is —O—, —NH—, —N (CH ₃ ) —, —CONH—, —NHCO—, —CH ₂ O—, —OCO—, —CON (CH ₃ ) — and —N (CH ₃ ) a divalent organic group selected from CO—, A ² is a single bond, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a non-aromatic cyclic hydrocarbon group or an aromatic hydrocarbon group; A ³ is a single bond, —O—, —NH—, —N (CH ₃ ) —, —CONH—, —NHCO—, —COO—, —OCO—, —CON (CH ₃ ) —, —N (CH ₃ ) a divalent group selected from CO— and —O (CH ₂ ) _m — (m is an integer of 1 to 5), A ⁴ is a nitrogen-containing aromatic heterocyclic ring, and n is 1 to It is an integer of 4.)

The above-mentioned other diamine compounds are soluble in a solvent of a specific polymer, applicability of a liquid crystal alignment treatment agent, liquid crystal alignment properties when used as a liquid crystal alignment film, voltage holding ratio, accumulated charge, etc. One type or a mixture of two or more types can also be used.

<Tetracarboxylic acid component>
As the tetracarboxylic acid component for producing the specific polymer which is the component (B) of the present invention, a tetracarboxylic dianhydride represented by the following formula [3] or a tetracarboxylic acid which is a tetracarboxylic acid derivative thereof It is preferable to use a tetracarboxylic acid dihalide compound, a tetracarboxylic acid dialkyl ester compound or a tetracarboxylic acid dialkyl ester dihalide compound (all are collectively referred to as a specific tetracarboxylic acid component).

In the formula [3], Z ¹ is a group having a structure selected from the following formulas [3a] to [3j].

In the formula [3a], Z ² to Z ⁵ represent a hydrogen atom, a methyl group, a chlorine atom or a benzene ring, and may be the same or different.
In the formula [3g], Z ⁶ and Z ⁷ represent a hydrogen atom or a methyl group, and may be the same or different.

In the structure represented by formula [3], which is the specific tetracarboxylic acid component, Z ¹ is represented by formula [3a], A structure represented by [3c], formula [3d], formula [3e], formula [3f] or formula [3g] is preferable. More preferred is a structure represented by formula [3a], formula [3e], formula [3f] or formula [3g], and particularly preferred is formula [3e], formula [3f] or formula [3g]. It is.
The specific tetracarboxylic acid component is preferably 1 mol% or more of the total tetracarboxylic acid component. More preferred is 5 mol% or more, and particularly preferred is 10 mol% or more. Among these, 15 to 100 mol% is more preferable.

Moreover, when using the specific tetracarboxylic acid component of the structure of Formula [3e], Formula [3f], or Formula [3g], it is preferable that the usage-amount shall be 20 mol% or more of the whole tetracarboxylic acid component. More preferably, it is 30 mol% or more. Further, all of the tetracarboxylic acid component may be a tetracarboxylic acid component having a structure of the formula [3e], the formula [3f], or the formula [3g].
In the specific polymer, other tetracarboxylic acid components other than the specific tetracarboxylic acid component can be used as long as the effects of the present invention are not impaired.
Examples of other tetracarboxylic acid components include the following tetracarboxylic acid compounds, tetracarboxylic dianhydrides, tetracarboxylic acid dihalide compounds, tetracarboxylic acid dialkyl ester compounds, and tetracarboxylic acid dialkyl ester dihalide compounds.

That is, other tetracarboxylic acid components include pyromellitic acid, 2,3,6,7-naphthalenetetracarboxylic acid, 1,2,5,6-naphthalenetetracarboxylic acid, 1,4,5,8-naphthalene. Tetracarboxylic acid, 2,3,6,7-anthracenetetracarboxylic acid, 1,2,5,6-anthracenetetracarboxylic 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) sulfone, bis ( 3,4-dicarboxyphenyl) methane, 2,2-bis (3,4-dicarboxyphenyl) propane, 1,1,1,3,3,3-hexafluoro- , 2-bis (3,4-dicarboxyphenyl) propane, bis (3,4-dicarboxyphenyl) dimethylsilane, bis (3,4-dicarboxyphenyl) diphenylsilane, 2,3,4,5-pyridine Tetracarboxylic acid, 2,6-bis (3,4-dicarboxyphenyl) pyridine, 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic acid, 3,4,9,10-perylenetetracarboxylic acid or 1 , 3-diphenyl-1,2,3,4-cyclobutanetetracarboxylic acid.

The specific tetracarboxylic acid component and other tetracarboxylic acid components are the solubility of the specific polymer of the present invention in the solvent, the coating property of the liquid crystal aligning agent, the liquid crystal alignment property, and the voltage holding ratio when used as a liquid crystal alignment film. Depending on the characteristics such as accumulated charge, one kind or a mixture of two or more kinds may be used.

<Method for producing specific polymer>
The method for synthesizing the specific polymer is not particularly limited. Usually, it is obtained by reacting a diamine component and a tetracarboxylic acid component. Generally, at least one tetracarboxylic acid component selected from the group consisting of tetracarboxylic acids and derivatives thereof is reacted with a diamine component consisting of one or more diamine compounds to obtain a polyamic acid. Specifically, there are the following methods.
(1) A method of obtaining polyamic acid by polycondensation of a tetracarboxylic dianhydride and a primary or secondary diamine compound.
(2) A method in which a polycarboxylic acid is obtained by subjecting a tetracarboxylic acid and a primary or secondary diamine compound to a dehydration polycondensation reaction.
(3) A method for obtaining polyamic acid by polycondensation of a tetracarboxylic acid dihalide and a primary or secondary diamine compound.

To obtain the polyamic acid alkyl ester, a method of polycondensing a tetracarboxylic acid obtained by dialkyl esterifying a carboxylic acid group with a primary or secondary diamine compound, a tetracarboxylic acid dihalide obtained by dialkyl esterifying a carboxylic acid group and 1 A method of polycondensation with a secondary or secondary diamine compound or a method of converting a carboxyl group of a polyamic acid into an ester is used.
In order to obtain polyimide, a method is used in which the polyamic acid or polyamic acid alkyl ester is cyclized to form polyimide.

The reaction between the diamine component and the tetracarboxylic acid component is usually performed in an organic solvent containing the diamine component and the tetracarboxylic acid component. The organic solvent used at that time is not particularly limited as long as the produced polyimide precursor is dissolved. Although the specific example of the organic solvent used for reaction below is given, it is not limited to these examples.
Examples include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ-butyrolactone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide or 1,3-dimethyl-imidazolidinone. It is done.

When the solvent solubility of the polyimide precursor is high, methyl ethyl ketone, cyclohexanone, cyclopentanone, 4-hydroxy-4-methyl-2-pentanone, or the following formulas [D-1] to [D-3] The indicated solvents can be used.

(D ¹ represents an alkyl group having 1 to 3 carbon atoms, D ² represents an alkyl group having 1 to 3 carbon atoms, and D ³ represents an alkyl group having 1 to 4 carbon atoms.)

These may be used alone or in combination. Furthermore, even if it is a solvent which does not dissolve a polyimide precursor, you may mix and use the said solvent in the range which the produced | generated polyimide precursor does not precipitate. Moreover, since the water | moisture content in an organic solvent inhibits a polymerization reaction, and also causes the produced polyimide precursor to hydrolyze, it is preferable to use what dehydrated and dried the organic solvent.

When the diamine component and the tetracarboxylic acid component are reacted in an organic solvent, for example, there are the following methods, and any method may be used.
(1) A method in which a solution in which a diamine component is dispersed or dissolved in an organic solvent is stirred and the tetracarboxylic acid component is added as it is or dispersed or dissolved in an organic solvent.
(2) A method of adding a diamine component to a solution obtained by dispersing or dissolving a tetracarboxylic acid component in an organic solvent.
(3) A method of alternately adding a diamine component and a tetracarboxylic acid component.

In addition, when reacting using a plurality of diamine components or tetracarboxylic acid components, they may be reacted in a premixed state, individually or sequentially, or further individually reacted low molecular weight substances. May be mixed and reacted to form a polymer. In this case, the polymerization temperature can be selected from -20 to 150 ° C., but is preferably in the range of −5 to 100 ° C. The reaction can be carried out at any concentration, but if the concentration is too low, it is difficult to obtain a high molecular weight polymer, and if the concentration is too high, the viscosity of the reaction solution becomes too high and uniform stirring is difficult. It becomes. Therefore, it is preferably 1 to 50% by mass, more preferably 5 to 30% by mass. The initial stage of the reaction is carried out at a high concentration, and then an organic solvent can be added.

In the polymerization reaction of the polyimide precursor, the ratio of the total number of moles of the diamine component to the total number of moles of the tetracarboxylic acid component is preferably 0.8 to 1.2. Similar to a normal polycondensation reaction, the molecular weight of the polyimide precursor produced increases as the molar ratio approaches 1.0.
The polyimide of the present invention is a polyimide obtained by ring closure of the polyimide precursor, and in this polyimide, the ring closure rate of the amic acid group (also referred to as imidization rate) is not necessarily 100%. It can be arbitrarily adjusted according to the purpose.

Examples of the method for imidizing the polyimide precursor include thermal imidization in which the polyimide precursor solution is heated as it is or catalyst imidization in which a catalyst is added to the polyimide precursor solution.
When the polyimide precursor is thermally imidized in a solution, the temperature is 100 to 400 ° C., preferably 120 to 250 ° C., and it is preferable to carry out while removing water generated by the imidization reaction from the system.

The catalyst imidation of the polyimide precursor can be performed by adding a basic catalyst and an acid anhydride to the polyimide precursor solution and stirring at -20 to 250 ° C, preferably 0 to 180 ° C. The amount of the basic catalyst is 0.5 to 30 mol times, preferably 2 to 20 mol times of the amic acid group, and the amount of the acid anhydride is 1 to 50 mol times, preferably 3 to 30 mol of the amido acid group. Is double. Examples of the basic catalyst include pyridine, triethylamine, trimethylamine, tributylamine, trioctylamine and the like. Among them, pyridine is preferable because it has an appropriate basicity for proceeding with the reaction. Examples of the acid anhydride include acetic anhydride, trimellitic anhydride, pyromellitic anhydride, and the like. Among them, use of acetic anhydride is preferable because purification after completion of the reaction is facilitated. The imidization rate by catalytic imidation can be controlled by adjusting the amount of catalyst, reaction temperature, and reaction time.

When recovering the produced polyimide precursor or polyimide from the polyimide precursor or polyimide reaction solution, the reaction solution may be poured into a solvent and precipitated. Examples of the solvent used for precipitation include methanol, ethanol, isopropyl alcohol, acetone, hexane, butyl cellosolve, heptane, methyl ethyl ketone, methyl isobutyl ketone, toluene, benzene, and water. The polymer precipitated in the solvent can be collected by filtration, and then dried by normal temperature or reduced pressure at room temperature or by heating. In addition, when the polymer collected by precipitation is redissolved in an organic solvent and reprecipitation and collection is repeated 2 to 10 times, impurities in the polymer can be reduced. Examples of the solvent at this time include alcohols, ketones, hydrocarbons and the like, and it is preferable to use three or more kinds of solvents selected from these because purification efficiency is further improved.

The molecular weight of the specific polymer is a weight average molecular weight measured by a GPC (Gel Permeation Chromatography) method in consideration of the strength of the liquid crystal alignment film obtained therefrom, workability at the time of forming the liquid crystal alignment film, and coating properties. It is preferably 5,000 to 1,000,000, more preferably 10,000 to 150,000.

<Liquid crystal alignment agent>
The liquid crystal aligning agent of the present invention is a coating solution for forming a liquid crystal alignment film (also referred to as a resin film), and is a coating solution for forming a liquid crystal alignment film containing a specific compound, a specific polymer and a solvent. is there.
The content of the specific compound in the liquid crystal aligning agent is 0.1 to 30 parts by mass with respect to 100 parts by mass of the specific polymer. Of these, 0.5 to 30 parts by mass is preferable, and 1 to 20 parts by mass is particularly preferable.

All the polymer components in the liquid crystal aligning agent may all be the specific polymer of the present invention, or other polymers may be mixed. In that case, the content of the other polymer is 0.5 to 15 parts by mass, preferably 1 to 10 parts by mass with respect to 100 parts by mass of the specific polymer of the present invention. Examples of other polymers include polyimide polymers that do not use the diamine compound represented by the formula [2] and the specific tetracarboxylic acid component. Furthermore, examples of other polymers include cellulosic polymers, acrylic polymers, methacrylic polymers, polystyrenes, polyamides, and polysiloxanes.

The solvent in the liquid crystal aligning agent is preferably 70 to 99.9% by mass of the solvent in the liquid crystal aligning agent from the viewpoint of forming a uniform liquid crystal alignment film by coating. The mass% is more preferable. This content can be appropriately changed depending on the film thickness of the target liquid crystal alignment film.

The solvent used for the liquid crystal aligning agent is not particularly limited as long as it is a solvent (also referred to as a good solvent) that dissolves the specific compound and the specific polymer. Although the specific example of a good solvent is given to the following, it is not limited to these examples.
For example, N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl sulfoxide, γ-butyrolactone, 1,3-dimethyl-imidazolidinone, methyl ethyl ketone Cyclohexanone, cyclopentanone, 4-hydroxy-4-methyl-2-pentanone, and the like.

Of these, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, or γ-butyrolactone is preferably used. Furthermore, when the solubility of the specific compound and the specific polymer in the solvent is high, it is preferable to use the solvent represented by the formula [D-1] to the formula [D-3].
The good solvent in the liquid crystal aligning agent is preferably 10 to 100% by mass of the total solvent contained in the liquid crystal aligning agent. Of these, 20 to 90% by mass is preferable. More preferred is 30 to 80% by mass.

As long as the effect of the present invention is not impaired, the liquid crystal aligning agent can use a solvent (also referred to as a poor solvent) that improves the coating properties and surface smoothness of the liquid crystal aligning film when the liquid crystal aligning agent is applied. . Although the specific example of a poor solvent is given to the following, it is not limited to these examples.

For example, ethanol, isopropyl alcohol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, isopentyl alcohol, tert-pentyl alcohol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-ethyl-1-butanol, 1-heptanol 2-heptanol, 3-heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclohexanol, 3-methylcyclohexanol, 1,2- Ethane All, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, dipropyl ether, dibutyl ether, dihexyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, 1 , 2-butoxyethane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol dibutyl ether, 2-pentanone, 3-pentanone, 2-hexanone, -Heptanone, 4-heptanone, 3-ethoxybutyl acetate, 1-methylpentyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, ethylene glycol monoacetate, ethylene glycol diacetate, propylene carbonate, ethylene Carbonate, 2- (methoxymethoxy) ethanol, ethylene glycol monobutyl ether, ethylene glycol monoisoamyl ether, ethylene glycol monohexyl ether, 2- (hexyloxy) ethanol, furfuryl alcohol, diethylene glycol, propylene glycol, propylene glycol monobutyl ether, 1 -(Butoxyethoxy) propanol, propylene glycol monomethyl ether acetate, dipropylene glycol , Dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monoacetate, ethylene glycol Diacetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, 2- (2-ethoxyethoxy) ethyl acetate, diethylene glycol acetate, triethylene glycol, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, Methyl lactate, ethyl lactate, methyl acetate, acetic acid Chill, n-butyl acetate, propylene glycol monoethyl ether, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl ethyl 3-ethoxypropionate, ethyl 3-methoxypropionate, 3-ethoxypropionic acid, 3-methoxypropionic acid, propyl 3-methoxypropionate, butyl 3-methoxypropionate, methyl lactate, ethyl lactate, n-propyl lactate, n-butyl lactate, isoamyl lactate, the formula [D-1 ] To a solvent represented by the formula [D-3].

Among them, 1-hexanol, cyclohexanol, 1,2-ethanediol, 1,2-propanediol, propylene glycol monobutyl ether, ethylene glycol monobutyl ether, or the above-mentioned formulas [D-1] to [D-3] It is preferable to use a solvent represented by
These poor solvents are preferably 1 to 70% by mass of the whole solvent contained in the liquid crystal aligning agent. Among these, 1 to 60% by mass is preferable. More preferred is 5 to 60% by mass.

As long as the effects of the present invention are not impaired, the liquid crystal aligning agent is at least selected from the group consisting of a compound having an epoxy group, an isocyanate group, an oxetane group or a cyclocarbonate group, a hydroxyl group, a hydroxyalkyl group and a lower alkoxyalkyl group. A compound having one kind of substituent, and a compound having a polymerizable unsaturated bond (also collectively referred to as a crosslinkable compound) can be introduced. It is necessary to have two or more of these substituents and polymerizable unsaturated bonds in the crosslinkable compound.

Examples of the crosslinkable compound having an epoxy group or an isocyanate group include bisphenolacetone glycidyl ether, phenol novolac epoxy resin, cresol novolac epoxy resin, triglycidyl isocyanurate, tetraglycidylaminodiphenylene, tetraglycidyl-m-xylenediamine, tetra Glycidyl-1,3-bis (aminoethyl) cyclohexane, tetraphenyl glycidyl ether ethane, triphenyl glycidyl ether ethane, bisphenol hexafluoroacetodiglycidyl ether, 1,3-bis (1- (2,3-epoxypropoxy)- 1-trifluoromethyl-2,2,2-trifluoromethyl) benzene, 4,4-bis (2,3-epoxypropoxy) octafluorobiphenyl Triglycidyl-p-aminophenol, tetraglycidylmetaxylenediamine, 2- (4- (2,3-epoxypropoxy) phenyl) -2- (4- (1,1-bis (4- (2,3-epoxy) Propoxy) phenyl) ethyl) phenyl) propane, 1,3-bis (4- (1- (4- (2,3-epoxypropoxy) phenyl) -1- (4- (1- (4- (2,3 -Epoxypropoxy) phenyl) -1-methylethyl) phenyl) ethyl) phenoxy) -2-propanol and the like.

The crosslinkable compound having an oxetane group is a crosslinkable compound having at least two oxetane groups represented by the following formula [4].

Specific examples include crosslinkable compounds represented by the formulas [4a] to [4k] published on pages 58 to 59 of International Publication No. WO2011 / 132751 (published 2011.10.27).

The crosslinkable compound having a cyclocarbonate group is a crosslinkable compound having at least two cyclocarbonate groups represented by the following formula [5].

Specifically, the crosslinkable compounds represented by the formulas [5-1] to [5-42] described on pages 76 to 82 of International Publication No. WO2012 / 014898 (published on 2012.2.2). It is done.

Examples of the crosslinkable compound having at least one substituent selected from the group consisting of a hydroxyl group and an alkoxyl group include an amino resin having a hydroxyl group or an alkoxyl group, such as a melamine resin, a urea resin, a guanamine resin, and a glycoluril. -Formaldehyde resin, succinylamide-formaldehyde resin, ethyleneurea-formaldehyde resin and the like. Specifically, a melamine derivative, a benzoguanamine derivative, or glycoluril in which a hydrogen atom of an amino group is substituted with a methylol group, an alkoxymethyl group, or both can be used. The melamine derivative or benzoguanamine derivative can exist as a dimer or a trimer. These preferably have an average of 3 to 6 methylol groups or alkoxymethyl groups per triazine ring.

Examples of such melamine derivatives or benzoguanamine derivatives include MX-750, which has an average of 3.7 substituted methoxymethyl groups per triazine ring, and an average of 5. methoxymethyl groups per triazine ring. Eight-substituted MW-30 (Sanwa Chemical Co., Ltd.) and Cymel 300, 301, 303, 350, 370, 771, 325, 327, 703, 712 and other methoxymethylated melamines, Cymel 235, 236 Methoxymethylated butoxymethylated melamine such as 238, 212, 253, 254, butoxymethylated melamine such as Cymel 506, 508, carboxyl group-containing methoxymethylated isobutoxymethylated melamine such as Cymel 1141, Cymel 1123 and the like Methoxymethylated etoxy Methylated benzoguanamine, methoxymethylated butoxymethylated benzoguanamine such as Cymel 1123-10, butoxymethylated benzoguanamine such as Cymel 1128, carboxyl group-containing methoxymethylated ethoxymethylated benzoguanamine such as Cymel 1125-80 Cyanamide). Examples of glycoluril include butoxymethylated glycoluril such as Cymel 1170, methylolated glycoluril such as Cymel 1172, and methoxymethylolated glycoluril such as Powderlink 1174.

Examples of benzene having a hydroxyl group or an alkoxyl group, or phenolic compounds include 1,3,5-tris (methoxymethyl) benzene, 1,2,4-tris (isopropoxymethyl) benzene, and 1,4-bis. (Sec-butoxymethyl) benzene, 2,6-dihydroxymethyl-p-tert-butylphenol and the like.

More specifically, the crosslinkable compounds represented by the formulas [6-1] to [6-48] described on pages 62 to 66 of International Publication No. WO2011 / 132751 (published 2011.10.27). Is mentioned.

Examples of the crosslinkable compound having a polymerizable unsaturated bond include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, and tri (meth) acryloyloxyethoxytrimethylol. Crosslinkable compounds having three polymerizable unsaturated groups in the molecule such as propane and glycerin polyglycidyl ether poly (meth) acrylate; ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) ) Acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di (me ) Acrylate, neopentyl glycol di (meth) acrylate, ethylene oxide bisphenol A type di (meth) acrylate, propylene oxide bisphenol type di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerin di (meth) ) Acrylate, pentaerythritol di (meth) acrylate, ethylene glycol diglycidyl ether di (meth) acrylate, diethylene glycol diglycidyl ether di (meth) acrylate, diglycidyl ester phthalate di (meth) acrylate, neopentyl glycol dihydroxypivalate Crosslinkable compounds having two polymerizable unsaturated groups in the molecule such as (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypro (Meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2- (meth) acryloyloxy-2-hydroxypropyl phthalate, 3-chloro-2-hydroxypropyl Crosslinkable compounds having one polymerizable unsaturated group in the molecule such as (meth) acrylate, glycerin mono (meth) acrylate, 2- (meth) acryloyloxyethyl phosphate ester or N-methylol (meth) acrylamide; Is mentioned.

In addition, a compound represented by the following formula [7] can also be used.

(E ₁ represents a group selected from the group consisting of a cyclohexane ring, a bicyclohexane ring, a benzene ring, a biphenyl ring, a terphenyl ring, a naphthalene ring, a fluorene ring, an anthracene ring and a phenanthrene ring, and E ₂ represents the following formula [7a And a group selected from the formula [7b], n represents an integer of 1 to 4.

The above compound is an example of a crosslinkable compound and is not limited thereto. Moreover, the crosslinkable compound used for the liquid-crystal aligning agent of this invention may be 1 type, and may be combined 2 or more types.

The content of the crosslinkable compound in the liquid crystal aligning agent is preferably 0.1 to 150 parts by mass with respect to 100 parts by mass of all the polymer components. In order for the crosslinking reaction to proceed and to achieve the desired effect, the amount is more preferably 0.1 to 100 parts by weight, and most preferably 1 to 50 parts by weight, based on 100 parts by weight of all polymer components.

As the liquid crystal alignment treatment agent, a compound that improves the uniformity of the film thickness and surface smoothness of the liquid crystal alignment film when the liquid crystal alignment treatment agent is applied can be used as long as the effects of the present invention are not impaired.

Examples of compounds that improve the film thickness uniformity and surface smoothness of the liquid crystal alignment film include fluorine-based surfactants, silicone-based surfactants, and nonionic surfactants.

More specifically, for example, F-top EF301, EF303, EF352 (above, manufactured by Tochem Products), MegaFuck F171, F173, R-30 (above, manufactured by Dainippon Ink), Florard FC430, FC431 (or more) And Asahi Guard AG710, Surflon S-382, SC101, SC102, SC103, SC104, SC105, SC106 (above, manufactured by Asahi Glass Co., Ltd.). The use ratio of these surfactants is preferably 0.01 to 2 parts by mass, more preferably 0.01 to 1 part by mass with respect to 100 parts by mass of all the polymer components contained in the liquid crystal aligning agent. It is.

Furthermore, the liquid crystal alignment treatment agent is a compound that promotes charge transfer in the liquid crystal alignment film and promotes charge release of the device, and is disclosed in International Patent Publication WO2011 / 132751 (published 2011.10.27), pages 69-73. It is also possible to add nitrogen-containing heterocyclic amine compounds represented by the formulas [M1] to [M156] described in This amine compound may be added directly to the liquid crystal aligning agent, but it is preferably added after a solution having a concentration of 0.1 to 10% by mass, preferably 1 to 7% by mass with an appropriate solvent. The solvent to be used is not particularly limited as long as it is an organic solvent capable of dissolving the above-described specific polymer.

In addition to the poor solvent, the crosslinkable compound, the resin film or the liquid crystal alignment film, the compound that improves the film thickness uniformity and surface smoothness, and the compound that promotes charge removal, As long as the effect is not impaired, a dielectric material or conductive material for changing the electrical characteristics such as the dielectric constant or conductivity of the liquid crystal alignment film may be added.
<Liquid crystal alignment film and liquid crystal display element>
The liquid crystal alignment treatment agent of the present invention can be used as a liquid crystal alignment film after being applied and baked on a substrate and then subjected to alignment treatment by rubbing treatment or light irradiation. In the case of vertical alignment, etc., it can be used as a liquid crystal alignment film without alignment treatment. The substrate used in this case is not particularly limited as long as it is a highly transparent substrate. In addition to a glass substrate, a plastic substrate such as an acrylic substrate or a polycarbonate substrate can also be used. From the viewpoint of simplification of the process, it is preferable to use a substrate on which an ITO electrode for driving a liquid crystal is formed. In the reflective liquid crystal display element, an opaque substrate such as a silicon wafer can be used if only one substrate is used, and a material that reflects light such as aluminum can be used as an electrode in this case.

The method for applying the liquid crystal alignment treatment agent is not particularly limited, but industrially, screen printing, offset printing, flexographic printing, inkjet method, and the like are common. Other coating methods include a dipping method, a roll coater method, a slit coater method, a spinner method, and a spray method, and these may be used depending on the purpose.

After applying the liquid crystal aligning agent on the substrate, it is preferably 30 to 300 ° C., depending on the solvent used for the liquid crystal aligning agent, by a heating means such as a hot plate, a thermal circulation oven, or an IR (infrared) oven. The liquid crystal alignment film can be obtained by evaporating the solvent at a temperature of 30 to 250 ° C. If the thickness of the liquid crystal alignment film after baking is too thick, it is disadvantageous in terms of power consumption of the liquid crystal display element, and if it is too thin, the reliability of the liquid crystal display element may be lowered. Is 10 to 100 nm. When the liquid crystal is horizontally aligned or tilted, the fired liquid crystal alignment film is treated by rubbing, polarized ultraviolet irradiation, or the like.

The liquid crystal display element of the present invention is a liquid crystal display element obtained by obtaining a substrate with a liquid crystal alignment film from the liquid crystal alignment treatment agent of the present invention by the above-described method and then preparing a liquid crystal cell by a known method.

As a method for manufacturing a liquid crystal cell, prepare a pair of substrates on which a liquid crystal alignment film is formed, spray spacers on the liquid crystal alignment film on one substrate, and place the liquid crystal alignment film surface on the other side. And a method of sealing the substrate by injecting liquid crystal under reduced pressure, or a method of sealing the substrate by bonding the liquid crystal after dropping the liquid crystal on the liquid crystal alignment film surface on which spacers are dispersed.

Furthermore, the liquid-crystal aligning agent of this invention has a liquid-crystal layer between a pair of board | substrates provided with the electrode, The polymeric compound superposed | polymerized by at least one of an active energy ray and a heat | fever between a pair of board | substrates. The liquid crystal composition is also preferably used for a liquid crystal display device produced by polymerizing a polymerizable compound by at least one of irradiation with active energy rays and heating while applying a voltage between electrodes. Here, ultraviolet rays are suitable as the active energy ray. The wavelength of ultraviolet rays is 300 to 400 nm, preferably 310 to 360 nm. In the case of polymerization by heating, the heating temperature is 40 to 120 ° C, preferably 60 to 80 ° C. Moreover, you may perform an ultraviolet-ray and a heating simultaneously.

The above-mentioned liquid crystal display element controls the pretilt angle of liquid crystal molecules by a PSA (Polymer Sustained Alignment) method. In the PSA method, a small amount of a photopolymerizable compound, for example, a photopolymerizable monomer is mixed in a liquid crystal material, and after assembling a liquid crystal cell, a predetermined voltage is applied to the liquid crystal layer and an ultraviolet ray is applied to the photopolymerizable compound. The pretilt angle of the liquid crystal molecules is controlled by the produced polymer. That is, the alignment state of the liquid crystal molecules when the polymer is formed is memorized even after the voltage is removed, so the pretilt angle of the liquid crystal molecules can be adjusted by controlling the electric field formed in the liquid crystal layer. Can do. The PSA method does not require a rubbing process and is suitable for forming a vertical alignment type liquid crystal layer in which it is difficult to control the pretilt angle by the rubbing process.

The liquid crystal display element of the present invention is obtained by obtaining a substrate with a liquid crystal alignment film from a liquid crystal alignment treatment agent by the above-described method, then preparing a liquid crystal cell, and polymerizing a polymerizable compound by at least one of ultraviolet irradiation and heating. Thus, the orientation of the liquid crystal molecules can be controlled.

To give an example of manufacturing a PSA type liquid crystal cell, a pair of substrates on which a liquid crystal alignment film is formed is prepared, spacers are dispersed on the liquid crystal alignment film of one substrate, and the liquid crystal alignment film surface is on the inside. Then, the other substrate is bonded, the liquid crystal is injected under reduced pressure and sealed, and the liquid crystal is dropped on the liquid crystal alignment film surface on which the spacers are dispersed, and then the substrate is bonded and sealed. .

In the liquid crystal, a polymerizable compound that is polymerized by heat or ultraviolet irradiation is mixed. Examples of the polymerizable compound include compounds having at least one polymerizable unsaturated group such as an acrylate group or a methacrylate group in the molecule. In that case, the polymerizable compound is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the liquid crystal component. When the polymerizable compound is less than 0.01 part by mass, the polymerizable compound is not polymerized and the orientation of the liquid crystal cannot be controlled, and when it exceeds 10 parts by mass, the amount of the unreacted polymerizable compound increases and the liquid crystal display element. The seizure characteristics of the steel deteriorate.

After producing the liquid crystal cell, the polymerizable compound is polymerized by irradiating with heat or ultraviolet rays while applying an AC or DC voltage to the liquid crystal cell. Thereby, the alignment of the liquid crystal molecules can be controlled.

Furthermore, the liquid crystal aligning agent of the present invention has a liquid crystal layer between a pair of substrates provided with electrodes, and a polymerizable group that is polymerized by at least one of active energy rays and heat between the pair of substrates. The liquid crystal display element manufactured through the process of arrange | positioning the liquid crystal aligning film containing this, and applying a voltage between electrodes is used preferably. Here, ultraviolet rays are suitable as the active energy ray. The wavelength of ultraviolet rays is 300 to 400 nm, preferably 310 to 360 nm. In the case of polymerization by heating, the heating temperature is 40 to 120 ° C, preferably 60 to 80 ° C. Moreover, you may perform an ultraviolet-ray and a heating simultaneously.

In order to obtain a liquid crystal alignment film containing a polymerizable group that is polymerized from at least one of active energy rays and heat, a method of adding a compound containing this polymerizable group to the liquid crystal aligning agent, A method using a coalescing component may be mentioned.
Since the liquid crystal aligning agent of the present invention contains a specific compound having a double bond site that reacts by irradiation with heat or ultraviolet rays, the alignment of liquid crystal molecules can be controlled by at least one of ultraviolet irradiation and heating. .

For the production of a liquid crystal cell having a liquid crystal alignment film containing such a polymerizable group and the control of the alignment of liquid crystal molecules after the production of the liquid crystal cell, the same method as that of the above-mentioned PSA type liquid crystal cell is used.

A liquid crystal display element having a liquid crystal alignment film produced using the liquid crystal alignment treatment agent of the present invention has excellent reliability and can be suitably used for a large-screen high-definition liquid crystal television.

The present invention will be described in more detail with reference to the following examples, but should not be construed as being limited thereto.
"Abbreviations of compounds used in Synthesis Examples, Examples and Comparative Examples"

<Specific compounds>
P1: Compound represented by the following formula [P1] P2: Compound represented by the following formula [P2] P3: Compound represented by the following formula [P3]

<Monomer for producing polyimide polymer (specific polymer)>
(Specific diamine compound)
A1: 3,5-Diaminobenzoic acid A2: Diamine compound represented by the following formula [A2] A3: 1,3-diamino-4-octadecyloxybenzene A4: 1,3-diamino-4- [4- (trans -4-n-heptylcyclohexyl) phenoxy] benzene A5: 1,3-diamino-4- [4- (trans-4-n-heptylcyclohexyl) phenoxymethyl] benzene A6: 1,3-diamino- 4- {4- [trans-4- (trans-4-n-pentylcyclohexyl) cyclohexyl] phenoxy} benzene A7: diamine compound represented by the following formula [A7]

(Other diamine compounds)
B1: p-phenylenediamine B2: m-phenylenediamine

(Specific tetracarboxylic acid component)
C1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride C2: bicyclo [3,3,0] octane-2,4,6,8-tetracarboxylic dianhydride C3: the following formula [C3 ] C4: tetracarboxylic dianhydride represented by the following formula [C4]

<Solvent>
NMP: N-methyl-2-pyrrolidone NEP: N-ethyl-2-pyrrolidone γ-BL: γ-butyrolactone ECS: ethylene glycol monoethyl ether EC: diethylene glycol monoethyl ether BCS: ethylene glycol monobutyl ether PB: propylene glycol monobutyl ether

"Measurement method of molecular weight of polyimide polymer"
The molecular weight of the polyimide precursor and polyimide is as follows using a normal temperature gel permeation chromatography (GPC) apparatus (GPC-101) (manufactured by Showa Denko KK) and a column (KD-803, KD-805) (manufactured by Shodex). It measured as follows.
Column temperature: 50 ° C
Eluent: N, N′-dimethylformamide (as additive, lithium bromide-hydrate (LiBr · H ₂ O) 30 mmol / L (liter), phosphoric acid / anhydrous crystal (o-phosphoric acid) 30 mmol) / L, 10 ml / L of tetrahydrofuran (THF))
Flow rate: 1.0 ml / min Standard sample for preparing a calibration curve: TSK standard polyethylene oxide (molecular weight; about 900,000, 150,000, 100,000 and 30,000) (manufactured by Tosoh Corporation) and polyethylene glycol (molecular weight; about 12,000, 4,000 and 1,000) (manufactured by Polymer Laboratory).

"Measurement method of imidization rate of polyimide"
20 mg of polyimide powder was put into an NMR (nuclear magnetic resonance) sample tube (NMR sampling tube standard, φ5 (manufactured by Kusano Kagaku)), and deuterated dimethyl sulfoxide (DMSO-d6, 0.05 mass% TMS (tetramethylsilane)). (Mixed product) (0.53 ml) was added and completely dissolved by applying ultrasonic waves. This solution was measured for proton NMR at 500 MHz with an NMR measuring instrument (JNW-ECA500) (manufactured by JEOL Datum). The imidation rate is determined based on protons derived from structures that do not change before and after imidation as reference protons, and the peak integrated value of these protons and proton peaks derived from NH groups of amic acid appearing in the vicinity of 9.5 to 10.0 ppm. Using the integrated value, the following formula was used.
Imidization rate (%) = (1−α · x / y) × 100
In the above formula, x is a proton peak integrated value derived from NH group of amic acid, y is a peak integrated value of reference proton, α is one NH group proton of amic acid in the case of polyamic acid (imidation rate is 0%) Is the number ratio of the reference proton to.

<Synthesis Example 1>
C1 (3.45 g, 17.6 mmol), A2 (0.73 g, 3.57 mmol) and B1 (1.54 g, 14.3 mmol) were mixed in NMP (17.2 g) and reacted at 40 ° C. for 8 hours. To obtain a polyamic acid solution (1) having a resin solid content concentration of 25% by mass. The number average molecular weight of this polyamic acid was 26,600, and the weight average molecular weight was 85,200.

<Synthesis Example 2>
C2 (3.83 g, 15.3 mmol), A2 (0.93 g, 4.59 mmol) and B2 (2.81 g, 26.0 mmol) were mixed in NEP (21.0 g) and reacted at 50 ° C. for 2 hours. I let you. Thereafter, C1 (2.91 g, 14.8 mmol) and NEP (10.5 g) were added and reacted at 40 ° C. for 6 hours to obtain a polyamic acid solution (2) having a resin solid content concentration of 25 mass%. The number average molecular weight of this polyamic acid was 24,500, and the weight average molecular weight was 71,100.

<Synthesis Example 3>
After adding NEP to the polyamic acid solution (2) (30.0 g) obtained in Synthesis Example 2 and diluting to 6% by mass, acetic anhydride (3.95 g) and pyridine (2.45 g) were used as imidization catalysts. In addition, the mixture was reacted at 70 ° C. for 3 hours. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (3). The imidation ratio of this polyimide was 70%, the number average molecular weight was 22,100, and the weight average molecular weight was 60,100.

<Synthesis Example 4>
C2 (4.47 g, 17.9 mmol), A1 (1.95 g, 12.8 mmol) and A4 (4.85 g, 12.8 mmol) were mixed in NEP (25.4 g) and reacted at 80 ° C. for 5 hours. I let you. Thereafter, C1 (1.43 g, 7.30 mmol) and NEP (12.7 g) were added and reacted at 40 ° C. for 8 hours to obtain a polyamic acid solution (4) having a resin solid content concentration of 25 mass%. The number average molecular weight of this polyamic acid was 23,500, and the weight average molecular weight was 68,600.

<Synthesis Example 5>
After adding NEP to the polyamic acid solution (4) (30.2 g) obtained in Synthesis Example 4 and diluting to 6% by mass, acetic anhydride (3.80 g) and pyridine (2.40 g) were used as imidization catalysts. In addition, the mixture was reacted at 70 ° C. for 2 hours. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (5). The imidation ratio of this polyimide was 61%, the number average molecular weight was 19,900, and the weight average molecular weight was 57,100.

<Synthesis Example 6>
C2 (5.10 g, 20.4 mmol), A1 (1.94 g, 12.8 mmol), A2 (0.52 g, 2.55 mmol) and A5 (4.02 g, 10.2 mmol) with NMP (25.0 g) And mixed at 80 ° C. for 5 hours. Thereafter, C1 (0.93 g, 4.80 mmol) and NMP (12.5 g) were added and reacted at 40 ° C. for 6 hours to obtain a polyamic acid solution having a resin solid content concentration of 25 mass%.
After adding NMP to the obtained polyamic acid solution (30.0 g) and diluting to 6% by mass, acetic anhydride (4.54 g) and pyridine (3.33 g) were added as an imidization catalyst, and 3. The reaction was allowed for 5 hours. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (6). The imidation ratio of this polyimide was 85%, the number average molecular weight was 16,800, and the weight average molecular weight was 50,100.

<Synthesis Example 7>
C2 (2.42 g, 9.69 mmol), A1 (2.58 g, 17.0 mmol) and A6 (3.14 g, 7.27 mmol) were mixed in NEP (21.9 g) and reacted at 80 ° C. for 5 hours. Then, C1 (2.79 g, 14.2 mmol) and NEP (10.9 g) were added and reacted at 40 ° C. for 6 hours to obtain a polyamic acid solution having a resin solid content concentration of 25 mass%.
To the obtained polyamic acid solution (30.0 g), NEP was added and diluted to 6% by mass, and then acetic anhydride (4.40 g) and pyridine (3.25 g) were added as an imidization catalyst, and the mixture was heated at 80 ° C. for 3 hours. Reacted. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (7). The imidation ratio of this polyimide was 81%, the number average molecular weight was 17,400, and the weight average molecular weight was 52,800.

<Synthesis Example 8>
C2 (4.32 g, 17.3 mmol), A1 (3.00 g, 19.7 mmol) and A7 (2.43 g, 4.93 mmol) were mixed in NMP (22.2 g) and reacted at 80 ° C. for 5 hours. I let you. Thereafter, C1 (1.37 g, 7.00 mmol) and NMP (11.1 g) were added and reacted at 40 ° C. for 6 hours to obtain a polyamic acid solution having a resin solid content concentration of 25 mass%.
After adding NMP to the obtained polyamic acid solution (30.5 g) and diluting to 6% by mass, acetic anhydride (3.90 g) and pyridine (2.55 g) were added as imidization catalysts, and the mixture was heated at 60 ° C. for 3 hours. Reacted. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (8). The imidation ratio of this polyimide was 53%, the number average molecular weight was 16,500, and the weight average molecular weight was 51,800.

<Synthesis Example 9>
C3 (5.40 g, 24.1 mmol), A1 (2.43 g, 15.9 mmol), A2 (0.50 g, 2.45 mmol) and A7 (3.02 g, 6.13 mmol) were added to NMP (34.1 g). Then, the mixture was reacted at 40 ° C. for 8 hours to obtain a polyamic acid solution having a resin solid content concentration of 25% by mass.
After adding NMP to the obtained polyamic acid solution (30.0 g) and diluting to 6% by mass, acetic anhydride (4.05 g) and pyridine (2.50 g) were added as imidization catalysts, and the mixture was heated at 60 ° C. for 2 hours. Reacted. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (9). The imidation ratio of this polyimide was 55%, the number average molecular weight was 16,100, and the weight average molecular weight was 48,100.

<Synthesis Example 10>
C3 (5.38 g, 24.0 mmol), A1 (2.22 g, 14.6 mmol) and A5 (3.84 g, 9.72 mmol) were mixed in NMP (34.3 g) and reacted at 40 ° C. for 8 hours. Thus, a polyamic acid solution having a resin solid content concentration of 25% by mass was obtained.
After adding NMP to the obtained polyamic acid solution (30.0 g) and diluting to 6% by mass, acetic anhydride (4.00 g) and pyridine (2.50 g) were added as an imidization catalyst, and the mixture was maintained at 70 ° C. for 2 hours. Reacted. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (9). The imidation ratio of this polyimide was 61%, the number average molecular weight was 17,300, and the weight average molecular weight was 51,100.

<Synthesis Example 11>
C4 (3.48 g, 11.6 mmol), A1 (1.06 g, 6.95 mmol), A2 (0.94 g, 4.63 mmol) and A3 (4.36 g, 11.6 mmol) NEP (24.1 g) And mixed at 40 ° C. for 6 hours. Thereafter, C1 (2.20 g, 11.2 mmol) and NEP (12.0 g) were added and reacted at 25 ° C. for 8 hours to obtain a polyamic acid solution having a resin solid content concentration of 25 mass%.
To the obtained polyamic acid solution (30.0 g), NEP was added to dilute to 6% by mass, and then acetic anhydride (7.20 g) and pyridine (2.30 g) were added as an imidization catalyst. The reaction was allowed for 5 hours. This reaction solution was put into methanol (460 ml), and the resulting precipitate was separated by filtration. This deposit was wash | cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (11). The imidation ratio of this polyimide was 70%, the number average molecular weight was 17,500, and the weight average molecular weight was 40,100.
Table 1 summarizes the polyimide polymers.

* 1: Polyamic acid.

"Evaluation of inkjet coating properties of liquid crystal alignment treatment agents"
The liquid crystal aligning agent was filtered under pressure with a membrane filter having a pore diameter of 1 μm, and the inkjet coating property was evaluated. As the ink jet coater, HIS-200 (manufactured by Hitachi Plant Technology) was used. Application is on an ITO (Indium Tin Oxide) vapor-deposited substrate cleaned with pure water and IPA (isopropyl alcohol), the application area is 70 × 70 mm, the nozzle pitch is 0.423 mm, and the scan pitch is 0.5 mm. The speed was 40 mm / second, the time from application to temporary drying was 60 seconds, and temporary drying was performed on a hot plate at 70 ° C. for 5 minutes.
The coating properties of the obtained substrate with a liquid crystal alignment film were confirmed. Specifically, the coating film was visually observed under a sodium lamp to confirm the presence or absence of pinholes. As a result, in any of the liquid crystal alignment films obtained in any of the examples, no pinhole was found on the coating film, and a liquid crystal alignment film having excellent coating properties was obtained.

“Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (normal cell)”
The crystal alignment treatment agent was pressure filtered through a membrane filter having a pore diameter of 1 μm to prepare a liquid crystal cell (normal cell). This solution was spin-coated on the ITO surface of a substrate with 100 × 100 mm ITO electrodes (length 100 mm × width 100 mm, thickness 0.7 mm) washed with pure water and IPA, and then on a hot plate at 100 ° C. for 5 minutes. Then, heat treatment was performed at 230 ° C. for 30 minutes in a heat circulation clean oven to obtain an ITO substrate with a polyimide liquid crystal alignment film having a film thickness of 100 nm. The surface of the ITO substrate was rubbed using a rayon cloth with a rubbing apparatus having a roll diameter of 120 mm under the conditions of a roll rotation speed of 1000 rpm, a roll traveling speed of 50 mm / sec, and an indentation amount of 0.1 mm.
Two ITO substrates with the obtained liquid crystal alignment film were prepared, and 6 μm spacers were scattered on the liquid crystal alignment film surface of one of the substrates with the liquid crystal alignment film. Thereafter, an ultraviolet curable sealant was drawn around the substrate, and liquid crystal was injected by an ODF (One Drop Filling) method to obtain a liquid crystal cell. Thereafter, in order to cure the ultraviolet curable sealant, the liquid crystal cell was cut with a wavelength of 310 nm or less using a metal halide lamp with an illuminance of 60 mW, and irradiated with ultraviolet rays of 5 J / cm ^{2 in} terms of 365 nm. Thereafter, heat treatment was performed at 120 ° C. for 60 minutes in a heat-circulating clean oven to obtain a liquid crystal cell (ordinary cell).

A liquid crystal cell using the liquid crystal aligning agents (1) to (3) obtained in Examples 1 to 3 and the liquid crystal aligning agents (21) to (22) obtained in Comparative Examples 1 to 2 was used. Used nematic liquid crystal (MLC-2003) (manufactured by Merck Japan) as the liquid crystal.
Further, the liquid crystal aligning agents (4) to (6) obtained in Examples 4 to 6, the liquid crystal aligning agent (8) obtained in Example 8, and the liquid crystal aligning agent obtained in Example 9 ( 9) Liquid crystal aligning agents (11) to (15) obtained in Examples 11 to 15, Liquid crystal aligning agents (17) to (20) obtained in Examples 17 to 20, and Comparative Examples 3 to In the liquid crystal cell using the liquid crystal alignment agents (23) to (24) obtained in Step 4, nematic liquid crystal (MLC-6608) (manufactured by Merck Japan) was used as the liquid crystal.

The obtained liquid crystal cell (ordinary cell) was visually observed using a polarizing plate and a backlight, and the liquid crystal orientation in the vicinity of the sealant was evaluated. As a result, any liquid crystal obtained in Examples and Comparative Examples was obtained. Both cells showed uniform liquid crystal alignment.
Thereafter, the liquid crystal cell was stored in a high-temperature and high-humidity tank having a temperature of 80 ° C. and a humidity of 90% RH for 36 hours, and the liquid crystal orientation in the vicinity of the sealant was evaluated under the same conditions as described above. Specifically, it was determined that the evaluation in which the disorder of the liquid crystal orientation was not observed in the vicinity of the sealant was excellent in this evaluation.
In Tables 5 to 7, “O” indicates that the liquid crystal orientation is not disturbed, and “X” indicates that the liquid crystal orientation is not disturbed.

"Evaluation of voltage holding ratio after storage at high temperature and high humidity (normal cell)"
The liquid crystal aligning agent was pressure filtered through a membrane filter having a pore diameter of 1 μm to prepare a liquid crystal cell (normal cell). This solution was spin-coated on the ITO surface of a 30 × 40 mm ITO electrode substrate (40 mm long × 30 mm wide, 0.7 mm thick) washed with pure water and IPA, and heated at 100 ° C. for 5 minutes on a hot plate. Then, heat treatment was performed at 230 ° C. for 30 minutes in a heat circulation clean oven to obtain an ITO substrate with a polyimide liquid crystal alignment film having a film thickness of 100 nm. The surface of the ITO substrate was rubbed using a rayon cloth with a rubbing apparatus having a roll diameter of 120 mm under the conditions of a roll rotation speed of 1000 rpm, a roll traveling speed of 50 mm / sec, and an indentation amount of 0.1 mm.

Two obtained ITO substrates with a liquid crystal alignment film were prepared, combined with a 6 μm spacer sandwiched with the liquid crystal alignment film surface inside, and an ultraviolet curable sealant was printed. Subsequently, after bonding together so that the other board | substrate and the liquid crystal aligning film surface might face each other, the process for hardening an ultraviolet curing sealing agent was performed, and the empty cell was obtained. Specifically, using a metal halide lamp with an illuminance of 60 mW, the wavelength of 310 nm or less is cut, irradiated with ultraviolet rays of 5 J / cm ^{2 in} terms of 365 nm, and then in a heat-circulating clean oven at 120 ° C. for 60 minutes. An empty cell was obtained by heat treatment. A liquid crystal cell (normal cell) was obtained by injecting liquid crystal into this empty cell by a reduced pressure injection method and sealing the injection port.
In addition, the liquid crystal used for manufacturing the liquid crystal cell of each Example and Comparative Example was the same as the above-mentioned “Evaluation of display unevenness characteristics in the vicinity of the frame of the liquid crystal cell after high temperature and high humidity storage (normal cell)”.

A voltage of 1 V was applied to the obtained liquid crystal cell at a temperature of 80 ° C. for 60 μs, the voltage after 50 ms was measured, and how much the voltage was held was calculated as a voltage holding ratio (also referred to as VHR). The measurement was performed using a voltage holding ratio measuring device (VHR-1) (manufactured by Toyo Technica Co., Ltd.) with settings of Voltage: ± 1 V, Pulse Width: 60 μs, and Frame Period: 50 ms.
Further, the liquid crystal cell whose voltage holding ratio was measured was stored in a high-temperature and high-humidity tank having a temperature of 80 ° C. and a humidity of 90% RH for 48 hours, and the voltage holding ratio was measured again under the same conditions as described above. .
The evaluation was better when the decrease in the voltage holding ratio after storage in the high-temperature and high-humidity tank was smaller than the voltage holding ratio immediately after the production of the liquid crystal cell (Tables 5 to 7).

"Production of liquid crystal cell and evaluation of liquid crystal alignment (PSA cell)"
The liquid crystal aligning agent was pressure filtered through a membrane filter having a pore diameter of 1 μm to prepare a liquid crystal cell and evaluate the liquid crystal alignment (PSA cell). This solution was washed with pure water and IPA at the center with a 10 × 10 mm substrate with an ITO electrode having a pattern spacing of 20 μm (length 40 mm × width 30 mm, thickness 0.7 mm) and a substrate with an ITO electrode 10 × 40 mm at the center. Spin coated on ITO surface (length 40mm x width 30mm, thickness 0.7mm), heat-treated on a hot plate at 100 ° C for 5 minutes, and heat-circulating clean oven at 230 ° C for 30 minutes to form a film A polyimide coating film having a thickness of 100 nm was obtained.
This substrate with a liquid crystal alignment film was combined with a 6 μm spacer sandwiched with the liquid crystal alignment film surface inside, and the periphery was adhered with a sealant to produce an empty cell. A polymerizable compound (1) represented by the following formula was mixed in an amount of 0.3% by mass with respect to 100% by mass of nematic liquid crystal (MLC-6608) (manufactured by Merck Japan) by vacuum injection into this empty cell. The liquid crystal mixture thus prepared was injected, and the injection port was sealed to obtain a liquid crystal cell.

While applying an AC voltage of 5 V to the obtained liquid crystal cell, using a metal halide lamp with an illuminance of 60 mW, the wavelength of 350 nm or less was cut, and ultraviolet irradiation of 20 J / cm ^{2 in} terms of 365 nm was performed, and the alignment direction of the liquid crystal A liquid crystal cell (PSA cell) was controlled. The temperature in the irradiation apparatus when the liquid crystal cell was irradiated with ultraviolet rays was 50 ° C.

The response speed of the liquid crystal before and after the ultraviolet irradiation of the liquid crystal cell was measured. As the response speed, T90 → T10 from 90% transmittance to 10% transmittance was measured.
In the PSA cell obtained in the example, since the response speed of the liquid crystal cell after ultraviolet irradiation was faster than that of the liquid crystal cell before ultraviolet irradiation, it was confirmed that the alignment direction of the liquid crystal was controlled. Further, in any liquid crystal cell, it was confirmed by observation with a polarizing microscope (ECLIPSE E600WPOL) (manufactured by Nikon Corporation) that the liquid crystal was uniformly aligned.

<Example 1>
NMP (19.9 g) and BCS (11.8 g) were added to the polyamic acid solution (1) (10.0 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 1, and the mixture was stirred at 25 ° C. for 2 hours. did. Then, P2 (0.25g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (1). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (1), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 2>
NEP (18.9 g) and PB (14.4 g) were added to the polyamic acid solution (2) (10.5 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 2, and the mixture was stirred at 25 ° C. for 2 hours. did. Then, P2 (0.18g) was added and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (2). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (2), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 3>
NEP (17.0 g) and PB (7.30 g) were added to the polyimide powder (3) (1.55 g) obtained in Synthesis Example 3, and dissolved by stirring at 70 ° C. for 24 hours. Thereafter, P2 (0.11 g) was added to this solution, and the mixture was stirred at 60 ° C. for 6 hours to obtain a liquid crystal aligning agent (3). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (3), "Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 4>
NEP (19.8 g) and PB (15.1 g) are added to the polyamic acid solution (4) (11.0 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 4, and the mixture is stirred at 25 ° C. for 2 hours. did. Then, P2 (0.19g) was added and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (4). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal alignment treatment agent (4), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 5>
NEP (17.6 g), EC (4.30 g) and PB (12.9 g) were added to the polyamic acid solution (4) (11.0 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 4. And stirred at 25 ° C. for 2 hours. Thereafter, P1 (0.41 g) was added and stirred at 60 ° C. for 6 hours to obtain a liquid crystal aligning agent (5). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (5), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 6>
NEP (15.3 g) and PB (8.20 g) were added to the polyimide powder (5) (1.50 g) obtained in Synthesis Example 5, and dissolved by stirring at 70 ° C. for 24 hours. Thereafter, P2 (0.11 g) was added to this solution, and the mixture was stirred at 60 ° C. for 6 hours to obtain a liquid crystal aligning agent (6). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (6), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (normal cell)", "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ”and“ Preparation of liquid crystal cell and evaluation of liquid crystal alignment (PSA cell) ”were performed.

<Example 7>
NEP (23.1 g) and PB (12.4 g) were added to the polyimide powder (5) (1.10 g) obtained in Synthesis Example 5, and dissolved by stirring at 70 ° C. for 24 hours. Thereafter, P2 (0.077 g) was added to this solution and stirred at 60 ° C. for 6 hours to obtain a liquid crystal aligning agent (7). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (7), “evaluation of inkjet applicability of liquid crystal aligning agent” was performed.

<Example 8>
NMP (13.4 g), EC (2.40 g) and BCS (8.50 g) are added to the polyimide powder (5) (1.55 g) obtained in Synthesis Example 5, and the mixture is stirred at 70 ° C. for 24 hours. And dissolved. Then, P3 (0.23g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (8). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (8), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 9>
NEP (15.5 g) and PB (8.30 g) were added to the polyimide powder (6) (1.52 g) obtained in Synthesis Example 6, and dissolved by stirring at 70 ° C. for 24 hours. Then, P1 (0.26g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (9). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (9), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)", "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ”and“ Preparation of liquid crystal cell and evaluation of liquid crystal alignment (PSA cell) ”were performed.

<Example 10>
NEP (22.1 g) and PB (11.9 g) were added to the polyimide powder (6) (1.05 g) obtained in Synthesis Example 6, and dissolved by stirring at 70 ° C. for 24 hours. Then, P1 (0.18g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (10). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (10), “evaluation of inkjet applicability of liquid crystal aligning agent” was performed.

<Example 11>
NEP (9.40 g), γ-BL (4.70 g) and BCS (9.40 g) were added to the polyimide powder (7) (1.50 g) obtained in Synthesis Example 7, and the mixture was added at 70 ° C. for 24 hours. Stir to dissolve. Then, P2 (0.075g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (11). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (11), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 12>
NMP (14.1 g), ECS (2.40 g) and BCS (7.10 g) are added to the polyimide powder (7) (1.50 g) obtained in Synthesis Example 7, and the mixture is stirred at 70 ° C. for 24 hours. And dissolved. Then, P1 (0.075g) and P2 (0.15g) were added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (12). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (12), "Evaluation of display unevenness characteristics near the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 13>
NEP (15.5 g) and PB (8.30 g) were added to the polyimide powder (8) (1.52 g) obtained in Synthesis Example 8, and dissolved by stirring at 70 ° C. for 24 hours. Then, P2 (0.15g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (13). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (13), “Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (normal cell)”, “Evaluation of voltage holding ratio after storage at high temperature and high humidity” (Normal cell) ”and“ Preparation of liquid crystal cell and evaluation of liquid crystal alignment (PSA cell) ”were performed.

<Example 14>
NEP (15.3 g) and PB (8.20 g) were added to the polyimide powder (8) (1.50 g) obtained in Synthesis Example 8, and dissolved by stirring at 70 ° C. for 24 hours. Then, P1 (0.045g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (14). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (14), “Evaluation of display unevenness characteristics near the frame of the liquid crystal cell after storage at high temperature and high humidity (normal cell)” and “Evaluation of voltage holding ratio after storage at high temperature and high humidity” (Normal cell) ".

<Example 15>
NEP (11.8 g), γ-BL (2.40 g) and PB (9.40 g) were added to the polyimide powder (9) (1.50 g) obtained in Synthesis Example 9, and the mixture was added at 70 ° C. for 24 hours. Stir to dissolve. Then, P3 (0.15g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (15). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (15), “Evaluation of display unevenness around the frame of a liquid crystal cell after storage at high temperature and high humidity (normal cell)” and “Evaluation of voltage holding ratio after storage at high temperature and high humidity” (Normal cell) ".

<Example 16>
NEP (16.2 g), γ-BL (3.20 g) and PB (12.9 g) were added to the polyimide powder (9) (1.00 g) obtained in Synthesis Example 9, and the mixture was added at 70 ° C. for 24 hours. Stir to dissolve. Then, P3 (0.10g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (16). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (16), “evaluation of ink jet coatability of liquid crystal aligning agent” was performed.

<Example 17>
NMP (15.8 g) and PB (8.50 g) were added to the polyimide powder (10) (1.55 g) obtained in Synthesis Example 10, and dissolved by stirring at 70 ° C. for 24 hours. Then, P1 (0.23g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (17). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (17), "Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 18>
NEP (15.8 g) and PB (8.50 g) were added to the polyimide powder (10) (1.55 g) obtained in Synthesis Example 10, and dissolved by stirring at 70 ° C. for 24 hours. Then, P1 (0.11g) and P2 (0.11g) were added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (18). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (18), “Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (normal cell)”, “Evaluation of voltage holding ratio after storage at high temperature and high humidity” (Normal cell) ”and“ Preparation of liquid crystal cell and evaluation of liquid crystal alignment (PSA cell) ”were performed.

<Example 19>
Γ-BL (12.9 g), EC (2.40 g) and BCS (8.20 g) were added to the polyimide powder (11) (1.50 g) obtained in Synthesis Example 11, and the mixture was added at 70 ° C. for 24 hours. Stir to dissolve. Then, P3 (0.15g) was added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (19). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (19), "Evaluation of display unevenness around the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Example 20>
NMP (14.1 g), ECS (2.40 g) and BCS (7.10 g) are added to the polyimide powder (11) (1.50 g) obtained in Synthesis Example 11, and the mixture is stirred at 70 ° C. for 24 hours. And dissolved. Then, P1 (0.075g) and P2 (0.075g) were added to this solution, and it stirred at 60 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (20). Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (20), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Comparative Example 1>
NEP (18.9 g) and PB (14.4 g) were added to the polyamic acid solution (2) (10.5 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 2, and the mixture was stirred at 25 ° C. for 2 hours. And the liquid-crystal aligning agent (21) was obtained. Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (21), "Evaluation of display unevenness characteristics near the frame of a liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Comparative example 2>
NEP (17.0 g) and PB (7.30 g) are added to the polyimide powder (3) obtained in Synthesis Example 3 (1.55 g), and dissolved by stirring at 70 ° C. for 24 hours. Agent (22) was obtained. Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (22), "Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Comparative Example 3>
NEP (19.8 g) and PB (15.1 g) are added to the polyamic acid solution (4) (11.0 g) having a resin solid content concentration of 25% by mass obtained in Synthesis Example 4, and the mixture is stirred at 25 ° C. for 2 hours. As a result, a liquid crystal aligning agent (23) was obtained. Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (23), "Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

<Comparative example 4>
NEP (15.3 g) and PB (8.20 g) are added to the polyimide powder (5) (1.50 g) obtained in Synthesis Example 5, and dissolved by stirring at 70 ° C. for 24 hours. Agent (24) was obtained. Abnormalities such as turbidity and precipitation were not observed in the liquid crystal aligning agent, and it was confirmed that the liquid crystal aligning agent was a uniform solution.
Using the obtained liquid crystal aligning agent (24), "Evaluation of display unevenness around the frame of liquid crystal cell after storage at high temperature and high humidity (ordinary cell)" and "Evaluation of voltage holding ratio after storage at high temperature and high humidity" (Normal cell) ".

As can be seen from the above results, the liquid crystal alignment treatment agent of the example is close to the liquid crystal cell sealant even when the liquid crystal cell is stored in a high-temperature and high-humidity tank for a long time compared to the liquid crystal alignment treatment agent of the comparative example A liquid crystal alignment film was obtained in which the liquid crystal alignment properties were not disturbed. Furthermore, even when the liquid crystal cell was stored in a high-temperature and high-humidity tank for a long period of time, a liquid crystal alignment film capable of suppressing a decrease in voltage holding ratio was obtained. That is, the liquid crystal alignment treatment agent of the present invention becomes a liquid crystal alignment film that can suppress the occurrence of display unevenness near the frame of the liquid crystal display element and the decrease in voltage holding ratio under high temperature and high humidity conditions.
Specifically, it is a comparison between Example 2 and Comparative Example 1, Example 3 and Comparative Example 2, Example 4 and Comparative Example 3, and Example 6 and Comparative Example 4, and is the same as the Example ( It is a comparison with the comparative example which does not contain the specific compound which is (A) component using the specific polymer which is B) component. When the liquid crystal alignment treatment agent of the comparative example is used, if the liquid crystal cell is stored in a high-temperature and high-humidity tank for a long time, disorder of the liquid crystal alignment occurs near the sealant of the liquid crystal cell, and the voltage holding ratio is large. Declined.

A liquid crystal display element having a liquid crystal alignment film formed using the liquid crystal aligning agent of the present invention is excellent in reliability and can be suitably used for a large-screen, high-definition liquid crystal television, and the like. TN element, STN element, TFT It is useful as a liquid crystal element, particularly a vertical alignment type liquid crystal display element.
The entire contents of the specification, claims, and abstract of Japanese Patent Application No. 2013-96470 filed on May 1, 2013 are incorporated herein as the disclosure of the specification of the present invention. Is.

Claims

The liquid crystal aligning agent characterized by containing the following (A) component and (B) component.
(A) Component: A compound represented by the following formula [1].
(B) component: At least 1 type of polymer chosen from the group which consists of a polyimide precursor obtained by making a diamine component and a tetracarboxylic-acid component react, and a polyimide.

(X 1 represents a divalent organic group having an aliphatic hydrocarbon group having 1 to 20 carbon atoms, or a divalent organic group having 6 to 24 carbon atoms having a benzene ring or a cyclohexane ring, and X 2 represents A structure selected from the following formulas [1-1] to [1-5] is shown.)

(W 1 represents a hydrogen atom or a benzene ring.)
The liquid crystal aligning agent according to claim 1, wherein X 1 in the formula [1] is an alkylene group having 1 to 10 carbon atoms.
The liquid crystal aligning agent according to claim 1 or 2, wherein X 2 in the formula [1] has a structure selected from the formula [1-1], the formula [1-2], and the formula [1-4].
The liquid crystal aligning agent according to any one of claims 1 to 3, wherein the diamine component in the polymer of the component (B) contains at least one diamine compound having a structure represented by the following formula [2]. .

(Y represents a substituent having a structure selected from the following formulas [2-1] to [2-6], and m represents an integer of 1 to 4.)

(A represents an integer of 0 to 4, and b represents an integer of 0 to 4.
Y 1 represents a single bond, — (CH 2 ) a — (a is an integer of 1 to 15), —O—, —CH 2 O—, —COO— or OCO—, and Y 2 represents a single bond or — (CH 2 ) b — (b is an integer of 1 to 15), Y 3 is a single bond, — (CH 2 ) c — (c is an integer of 1 to 15), —O—, —CH 2 O—, —COO— or —OCO—, wherein Y 4 is a divalent cyclic group selected from a benzene ring, a cyclohexane ring and a heterocyclic ring, or a divalent divalent group having 12 to 25 carbon atoms having a steroid skeleton. An organic group, and an arbitrary hydrogen atom on the cyclic group includes an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, a fluorine-containing alkyl group having 1 to 3 carbon atoms, and 1 to 3 carbon atoms may be substituted with a fluorine-containing alkoxyl group or a fluorine atom, Y 5 is a benzene ring, a cycloalkyl A divalent cyclic group selected from a xanth ring and a heterocyclic ring, and any hydrogen atom on these cyclic groups is an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, or 1 to 3 carbon atoms; 3 is a fluorine-containing alkyl group, may be substituted with a fluorine-containing alkoxyl group having 1 to 3 carbon atoms or a fluorine atom, n is an integer of 0 to 4, Y 6 is an alkyl group having 1 to 18 carbon atoms, A fluorine-containing alkyl group having 1 to 18 carbon atoms, an alkoxyl group having 1 to 18 carbon atoms or a fluorine-containing alkoxyl group having 1 to 18 carbon atoms;
Y 7 represents —O—, —CH 2 O—, —COO—, —OCO—, —CONH— or —NHCO—, and Y 8 represents an alkyl group having 8 to 22 carbon atoms.
Y 9 and Y 10 each independently represent a hydrocarbon group having 1 to 12 carbon atoms, and Y 11 represents an alkyl group having 1 to 5 carbon atoms. )
The liquid crystal aligning agent according to any one of claims 1 to 4, wherein the tetracarboxylic acid component in the polymer of the component (B) contains a compound represented by the following formula [3].

(Z 1 is a group having a structure selected from the following formulas [3a] to [3j].)

(Z 2 to Z 5 represent a hydrogen atom, a methyl group, a chlorine atom or a benzene ring, and may be the same or different, and Z 6 and Z 7 represent a hydrogen atom or a methyl group, and each represents the same. Or different.)
The liquid crystal aligning agent according to any one of claims 1 to 5, wherein the polymer of the component (B) is a polyimide obtained by dehydrating and cyclizing polyamic acid.
The liquid crystal aligning agent according to any one of claims 1 to 6, wherein the component (A) is 0.1 to 30 parts by mass with respect to 100 parts by mass of the component (B).
A liquid crystal alignment film obtained from the liquid crystal aligning agent according to any one of claims 1 to 7.
A liquid crystal alignment film obtained by an ink jet method using the liquid crystal alignment treatment agent according to any one of claims 1 to 7.
A liquid crystal display element having the liquid crystal alignment film according to claim 8.
A liquid crystal composition having a liquid crystal layer between a pair of substrates provided with electrodes and including a polymerizable compound that is polymerized by at least one of active energy rays and heat is disposed between the pair of substrates, and between the electrodes The liquid crystal aligning film of Claim 8 or 9 used for the liquid crystal display element manufactured by polymerizing the said polymeric compound, applying a voltage.
A liquid crystal display element having the liquid crystal alignment film according to claim 11.
A liquid crystal alignment layer including a liquid crystal layer between a pair of substrates provided with electrodes and including a polymerizable group that is polymerized by at least one of active energy rays and heat is disposed between the pair of substrates. The liquid crystal alignment film of Claim 8 or 9 used for the liquid crystal display element manufactured by polymerizing the said polymeric group, applying a voltage.
A liquid crystal display element having the liquid crystal alignment film according to claim 13.