KR20080081846A - Liquid crystal aligning agent and liquid crystal display device - Google Patents

Abstract

A liquid crystal aligning agent, and an LCD device containing an LC alignment layer obtained from the aligning agent are provided to reduce the accumulated charge with maintaining a high voltage holding ratio and to improve printing property. A liquid crystal aligning agent comprises a polymer obtained by the reaction of at least one selected from the group consisting of the tetracarboxylic dianhydrides represented by the formulas 1 and 2 and at least one selected from the group consisting of the diamines represented by the formulas 3 to 6, and/or its imidation polymer; a compound represented by the formula 7; and a solvent, wherein R1 to R4 are independently a C1-C40 linear, branched or cyclic alkyl group, or a C4-C40 linear, branched or cyclic alkenyl group, and 1-15 hydrogen atoms of R1 to R4 can be substituted with a hydrogen atom; X1 is a monovalent group represented by -R5(C2H4O)a(C3H6O)bR6 or -R5(C2H4O)aR6; m and n are an integer of 1020; R5 is independently a methylene group or a polymethylene group; R6 is an alkyl group; a and b are independently an integer of 1-20.

Description

Liquid crystal aligning agent and liquid crystal display element {LIQUID CRYSTAL ALIGNING AGENT AND LIQUID CRYSTAL DISPLAY DEVICE}

This invention relates to the liquid crystal aligning agent and liquid crystal display element which are used in order to form the liquid crystal aligning film of a liquid crystal display element. More specifically, it relates to the liquid crystal display element provided with the liquid crystal aligning agent which provides the liquid crystal aligning film which is favorable in electrical characteristics, and has favorable printability, and the liquid crystal aligning film obtained from the said liquid crystal aligning agent.

Currently, as a liquid crystal display element, the liquid crystal aligning film containing polyamic acid, polyimide, etc. is formed in the surface of the board | substrate with which transparent conductive films, such as ITO (indium oxide-tin oxide), are provided, and it is set as the board | substrate for liquid crystal display elements, The two sheets were arranged to face each other to form a layer of nematic liquid crystal having positive dielectric anisotropy in the gap to form a sandwich cell, and the long axis of the liquid crystal molecules was continuously twisted by 90 ° from one substrate to the other substrate. TN type liquid crystal display elements having a so-called TN (Twisted Nematic) type liquid crystal cell are known. In addition, a STN (Super Twisted Nematic) type liquid crystal display device having a higher contrast and less visual dependence than a TN type liquid crystal display device has been developed. The STN type liquid crystal display element uses a blend of nematic liquid crystals with a chiral agent, an optically active substance, as a liquid crystal, and the birefringence effect caused by the long axis of the liquid crystal molecules continuously twisted over 180 ° between the substrates. It is to use.

In addition to these, a vertically aligned liquid crystal display element called a multi-domain vertical alignment (MVA) method, in which protrusions are formed on a transparent conductive film to control the alignment direction of a liquid crystal, has been proposed (Patent Document 1 and Non-Patent Documents). 1). The liquid crystal display element of MVA system is excellent in a viewing angle, contrast, etc., and is excellent also in a manufacturing process aspect, such as not having to perform a rubbing process in formation of a liquid crystal aligning film.

As a liquid crystal aligning film suitable for the said TN, STN, and MVA system, electrical characteristics, such as afterimage erasing time of a liquid crystal display element, are calculated | required. Moreover, what has excellent printability in offset printing is calculated | required as an aligning agent used for formation of these liquid crystal aligning films.

[Patent Document 1] Japanese Patent Application Laid-Open No. 11-258605

[Patent Document 2] Japanese Unexamined Patent Publication No. 6-222366

[Patent Document 3] Japanese Unexamined Patent Publication No. 6-281937

[Patent Document 4] Japanese Patent Application Laid-Open No. 5-107544

[Non-Patent Document 1] "Liquid Crystal", Vol. 3 (No. 2), p117 (1999)

This invention is made | formed based on the said situation, The objective is that in the liquid crystal aligning film of a polyimide system, the liquid crystal aligning agent which reduces accumulation charge and maintains the high voltage retention, and has excellent printability, and It is to provide a liquid crystal display device using the same.

According to the present invention, the above object of the present invention firstly,

Polymers obtained by the reaction of at least one selected from the group of tetracarboxylic dianhydrides represented by the following formulas (1) and (2) and at least one selected from the diamine groups represented by the following formulas (3) to (6) and / or It is achieved by the imidation polymer, the compound represented by following formula (7), and the liquid crystal aligning agent containing a solvent.

(Wherein R ¹ to R ⁴ are each independently a linear, branched or cyclic alkyl group having 1 to 40 carbon atoms or a linear, branched or cyclic alkenyl group having 4 to 40 carbon atoms, and among the hydrogen atoms which R ¹ to R ⁴ have 1 to 15 may be substituted with a fluorine atom, A ¹ and A ² are each independently a hydrogen atom or a methyl group)

(Wherein X ¹ is a monovalent group represented by Formula 7a or 7b, m and n are integers from 1 to 20)

(Wherein R ⁵ is each independently a methylene group or a polymethylene group, R ⁶ is an alkyl group, and a and b are each independently an integer from 1 to 20)

According to this invention, the said objective of this invention is second achieved by the liquid crystal display element provided with the liquid crystal aligning film obtained from the said liquid crystal aligning agent.

The present invention can provide a liquid crystal aligning agent having a high printability while maintaining a high voltage retention in a polyimide-based liquid crystal aligning film, and a liquid crystal display device using the same.

The liquid crystal aligning agent of the present invention reacts with at least one selected from the group of tetracarboxylic dianhydrides represented by the formulas (1) and (2) and at least one selected from the diamine groups represented by the formulas (3) to (6). Polymers obtained by the following (hereinafter referred to as "specific polyamic acid") and / or imidized polymers thereof. Hereinafter, the tetracarboxylic dianhydride and diamine used in order to synthesize the polymer contained in the liquid crystal aligning agent of this invention are demonstrated.

Tetracarboxylic dianhydride

The tetracarboxylic dianhydride used for the synthesis of a specific polyamic acid and / or its imidized polymer is 2,3,5-tricarboxycyclopentylacetic dianhydride represented by the formula (1) and 5 represented by the formula (2). At least one selected from the group consisting of-(2,5-dioxotetrahydro-3-furanyl) -3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride (hereinafter, "specific tetra Carboxylic dianhydride ".

In the synthesis | combination of specific polyamic acid and / or its imidation polymer, other tetracarboxylic dianhydride can be used together in addition to specific tetracarboxylic dianhydride. As another tetracarboxylic dianhydride, For example, alicyclic tetracarboxylic dianhydride (except the specific tetracarboxylic dianhydride), aliphatic tetracarboxylic dianhydride, aromatic tetracarboxylic dianhydride Etc. can be mentioned.

As said alicyclic tetracarboxylic dianhydride, it is 1,2,3,4-cyclobutane tetracarboxylic dianhydride, 1,2-dimethyl-1,2,3,4-cyclobutane tetracarboxylic, for example. Acid dianhydrides, 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dichloro-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 1,2,4 , 5-cyclohexanetetracarboxylic dianhydride, 3,3 ', 4,4'-dicyclohexyltetracarboxylic dianhydride, cis-3,7-dibutylcycloocta-1,5-diene-1 , 2,5,6-tetracarboxylic dianhydride, 3,5,6-tricarbonyl-2-carboxynorbornane-2: 3,5: 6- dianhydride, 2,3,4,5- Tetrahydrofurantetracarboxylic dianhydride, 1,2,4-tricarboxycyclopentylacetic dianhydride, tetracyclo [4,4,0,1 ^2,5 , 1 ^7,10 ] degrees Decan-3,4,8,9-tetracarboxylic dianhydride, 1,3,3a, 4,5,9b-hexahydro-5 (tetrahydro-2,5-dioxo-3-furanyl)- Naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-5-methyl-5 (tetrahydro-2,5-dioxo-3 -Furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-5-ethyl-5 (tetrahydro-2,5 -Dioxo-3-furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-7-methyl-5 (tetra Hydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-7- Ethyl-5 (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4,5,9b- Hexahydro-8-methyl-5 (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1,3,3a, 4 , 5,9b-hexahydro-8-ethyl-5 (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] -furan-1,3-dione, 1, 3,3a, 4,5,9b-hexahydro-5,8-dimethyl-5 (tetrahydro-2,5-dioxo-3-furanyl)- Proto [1,2-c] -furan-1,3-dione, bicyclo [2.2.2] -oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 3-oxabi Cyclo [3.2.1] octane-2,4-dione-6-spiro-3 '-(tetrahydrofuran-2', 5'-dione), 3,5,6-tricarboxy-2-carboxynorbornane -2: 3,5: 6-anhydride, 4,9-dioxatricyclo [5.3.1.0 ^2,6 ] undecane-3,5,8,10-tetraone, formula (I) or (II )

(Wherein R ⁷ and R ⁹ represent a divalent organic group having an aromatic ring, R ⁸ and R ¹⁰ represent a hydrogen atom or an alkyl group, and a plurality of R ⁸ and R ¹⁰ may be the same or different, respectively)

The compound etc. which are represented by are mentioned.

As said aliphatic tetracarboxylic dianhydride, butane tetracarboxylic dianhydride etc. are mentioned, for example.

As said aromatic tetracarboxylic dianhydride, a pyromellitic dianhydride, 3,3 ', 4,4'- benzophenone tetracarboxylic dianhydride, 3,3', 4,4'-biphenyl Sulfontetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 3,3 ', 4,4'- Biphenylethertetracarboxylic dianhydride, 3,3 ', 4,4'-dimethyldiphenylsilanetetracarboxylic dianhydride, 3,3', 4,4'-tetraphenylsilanetetracarboxylic dianhydride Water, 1,2,3,4-furantheracarboxylic dianhydride, 4,4'-bis (3,4-dicarboxyphenoxy) diphenylsulfide dianhydride, 4,4'-bis (3, 4-dicarboxyphenoxy) diphenylsulfon dianhydride, 4,4'-bis (3,4-dicarboxyphenoxy) diphenylpropane dianhydride, 3,3 ', 4,4'-perfluoroisopropyl Ridendiphthalic dianhydride, 2,2 ', 3,3'-biphenyltetracarboxylic dianhydride, 3,3', 4,4'-biphenyltetraca Carboxylic acid dianhydride, bis (phthalic acid) phenylphosphine oxide dianhydride, p-phenylene-bis (triphenylphthalic acid) dianhydride, m-phenylene-bis (triphenylphthalic acid) dianhydride, bis (triphenylphthalic acid) ) -4,4'-diphenyl ether dianhydride, bis (triphenylphthalic acid) -4,4'-diphenylmethane dianhydride, ethylene glycol-bis (anhydrotrimelitate), propylene glycol-bis (anhydro Trimellitate), 1,4-butanediol-bis (anhydro trimellitate), 1,6-hexanediol-bis (anhydro trimellitate), 1,8-octanediol-bis (anhydro trimellitate ), 2,2-bis (4-hydroxyphenyl) propane-bis (anhydrotrimelitate), the compound represented by the following general formula (8)-(11), etc. are mentioned.

These other tetracarboxylic dianhydrides can be used individually or in combination of 2 or more types.

As alicyclic tetracarboxylic dianhydride among the said other tetracarboxylic dianhydrides, 1,2,3,4-cyclobutane tetracarboxylic dianhydride, 1,3-dimethyl-1,2,3,4- Cyclobutanetetracarboxylic dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic Acid dianhydride, 1,2,4-tricarboxycyclopentylacetic dianhydride, cis-3,7-dibutylcycloocta-1,5-diene-1,2,5,6-tetracarboxylic dianhydride, 3,5,6-tricarbonyl-2-carboxynorbornane-2: 3,5: 6-anhydride, 1,3,3a, 4,5,9b-hexahydro-5- (tetrahydro-2 , 5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-8-methyl-5- (Tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione, 1,3,3a, 4,5,9b-hexahydro-5 , 8-dimethyl-5- (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-di , Bicyclo [2.2.2] -oct-7-ene-2,3,5,6-tetracarboxylic dianhydride, 3-oxabicyclo [3.2.1] octane-2,4-dione-6- Spiro-3 '-(tetrahydrofuran-2', 5'-dione), among the compounds represented by the formula (I), the following formulas (12) to (14)

Of the compound represented by the formula or the compound represented by the formula (II)

The compound represented by the above is preferable from the viewpoint of being able to express good liquid crystal alignment, and is particularly preferable, and 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dimethyl-1,2, 3,4-cyclobutanetetracarboxylic dianhydride, 1,3,3a, 4,5,9b-hexahydro-5 (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [ 1,2-c] furan-1,3-dione, cis-3,7-dibutylcycloocta-1,5-diene-1,2,5,6-tetracarboxylic dianhydride, 1,2, 4-tricarboxycyclopentyl acetic dianhydride, 3,5,6-tricarbonyl-2-carboxynorbornane-2: 3,5: 6- dianhydride, 1,3,3a, 4,5,9b- Hexahydro-8-methyl-5- (tetrahydro-2,5-dioxo-3-furanyl) -naphtho [1,2-c] furan-1,3-dione, 3-oxabicyclo [3.2 .1] octane-2,4-dione-6-spiro-3 '-(tetrahydrofuran-2', 5'-dione) or the compound represented by the said General formula (12) is mentioned.

Among other tetracarboxylic dianhydrides, as preferable aliphatic tetracarboxylic dianhydride or aromatic tetracarboxylic dianhydride, butanetetracarboxylic dianhydride, pyromellitic dianhydride, 3,3 ', 4,4' -Benzophenonetetracarboxylic dianhydride, 2,2 ', 3,3'-biphenylsulfontetracarboxylic dianhydride, 3,3', 4,4'-biphenylsulfontetracarboxylic dianhydride or 1,4,5,8-naphthalene tetracarboxylic dianhydride is mentioned.

As other tetracarboxylic dianhydride, it is preferable to use alicyclic tetracarboxylic dianhydride.

When using together specific tetracarboxylic dianhydride and another tetracarboxylic dianhydride in the synthesis | combination of a specific polyamic acid, the use ratio of specific tetracarboxylic dianhydride is 50 mol% or more with respect to all tetracarboxylic dianhydride. It is preferable.

<Diamine>

The diamine used for the synthesis | combination of a specific polyamic acid and / or its imidation polymer is 1 or more types chosen from the group which consists of the diamine represented by the said Formula (3-6) (henceforth "a specific diamine").

In the synthesis of a specific polyamic acid and / or its imidized polymer, other diamines may be used in addition to the specific diamine. As another diamine, aromatic diamine, aliphatic or alicyclic diamine, the diamine which has two primary amino groups in a molecule | numerator, and nitrogen atoms other than the said primary amino group, diamino organosiloxane, etc. are mentioned, for example.

Examples of the aromatic diamine include p-phenylenediamine, 2-methyl-1,4-phenylenediamine, 2-ethyl-1,4-phenylenediamine, and 2,5-dimethyl-1,4-phenylene. Diamine, 2,5-diethyl-1,4-phenylenediamine, 2,3,5,6-tetramethyl-1,4-phenylenediamine, m-phenylenediamine, 4,4'-diaminodi Phenylmethane, 4,4'-diaminodiphenylethane, 4,4'-diaminodiphenylsulfide, 4,4'-diaminodiphenylsulfone, 2,2'-dimethyl-4,4'-dia Minobiphenyl, 3,3'-dimethyl-4,4'-diaminobiphenyl, 4,4'-diaminobenzanilide, 4,4'-diaminodiphenylether, 1,5-diaminonaphthalene, 3,3-dimethyl-4,4'-diaminobiphenyl, 5-amino-1- (4'-aminophenyl) -1,3,3-trimethylindane, 6-amino-1- (4'-amino Phenyl) -1,3,3-trimethylindane, 3,4'-diaminodiphenylether, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone, 4,4'-diamino Benzophenone, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) Nil] hexafluoropropane, 2,2-bis (4-aminophenyl) hexafluoropropane, 2,2-bis [4- (4-aminophenoxy) phenyl] sulfone, 1,4-bis (4- Aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) benzene, 1,3-bis (3-aminophenoxy) benzene, 9,9-bis (4-aminophenyl) -10-hydroanthracene , 2,7-diaminofluorene, 9,9-dimethyl-2,7-diaminofluorene, 9,9-bis (4-aminophenyl) fluorene, 4,4'-methylene-bis (2- Chloroaniline), 2,2 ', 5,5'-tetrachloro-4,4'-diaminobiphenyl, 2,2'-dichloro-4,4'-diamino-5,5'-dimethoxy ratio Phenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 1,4,4 '-(p-phenyleneisopropylidene) bisaniline, 4,4'-(m-phenyleneiso Propylidene) bisaniline, 2,2'-bis [4- (4-amino-2-trifluoromethylphenoxy) phenyl] hexafluoropropane, 4,4'-diamino-2,2'-bis (Trifluoromethyl) biphenyl, 4,4'-bis [(4-amino-2-trifluoromethyl) phenoxy] -octaf Rubiobiphenyl, 3,6-diaminocarbazole, N-methyl-3,6-diaminocarbazole, N-ethyl-3,6-diaminocarbazole, N-phenyl-3,6-diaminocarbazole Bazol and the like;

Examples of the aliphatic or alicyclic diamines include 1,1-methacrylylenediamine, 1,3-propanediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, heptamethylenediamine, octamethylenediamine, and nonnamethylene. Diamine, 4,4-diaminoheptamethylenediamine, 1,4-diaminocyclohexane, isophoronediamine, tetrahydrodicyclopentadienylenediamine, hexahydro-4,7-methanoindanylenedimethylenediamine, tricyclo [6.2.1.0 ^2,7 ] -undecylenedimethyldiamine, 4,4'-methylenebis (cyclohexylamine), and the like;

Examples of the diamine having two primary amino groups and nitrogen atoms other than the primary amino group in the molecule include 2,3-diaminopyridine, 2,6-diaminopyridine, 3,4-diaminopyridine, 2 , 4-diaminopyrimidine, 5,6-diamino-2,3-dicyanopyrazine, 5,6-diamino-2,4-dihydroxypyrimidine, 2,4-diamino-6-dimethyl Amino-1,3,5-triazine, 1,4-bis (3-aminopropyl) piperazine, 2,4-diamino-6-isopropoxy-1,3,5-triazine, 2,4 -Diamino-6-methoxy-1,3,5-triazine, 2,4-diamino-6-phenyl-1,3,5-triazine, 2,4-diamino-6-methyl-s -Triazine, 2,4-diamino-1, 3,5-triazine, 4,6-diamino-2-vinyl-s-triazine, 2,4-diamino-5-phenylthiazole, 2 , 6-diaminopurine, 5,6-diamino-1,3-dimethyluracil, 3,5-diamino-1,2,4-triazole, 6,9-diamino-2-ethoxyacridinlac Tate, 3,8-diamino-6-phenylphenanthridine, 1,4-diaminopiperazine, 3,6- Amino quinoa acridine, bis (4-aminophenyl) phenylamine, and the like;

As said diamino organosiloxane, it is following General formula (16), for example.

(Wherein R ¹¹ represents a hydrocarbon group having 1 to 12 carbon atoms, a plurality of R ^{11 's} may be the same or different, and p is an integer of 1 to 3 and q is an integer of 1 to 20)

The compound etc. which are represented by these are mentioned, respectively.

These other diamine can be used individually or in combination of 2 or more types.

Of these other diamines, p-phenylenediamine, 2-methyl-1,4-phenylenediamine, 2-ethyl-1,4-phenylenediamine, 2,5-dimethyl-1,4-phenylenediamine, 2 , 5-diethyl-1,4-phenylenediamine, 2,3,5,6-tetramethyl-1,4-phenylenediamine, 4,4'-diaminodiphenylmethane, 4,4'-dia Minodiphenylphenyl, 2,2'-dimethyl-4,4'-diaminobiphenyl, 1,5-diaminonaphthalene, 2,7-diaminofluorene, 9,9-dimethyl-2,7- Diaminofluorene, 4,4'-diaminodiphenylether, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 9,9-bis (4-aminophenyl) fluorene, 2 , 2-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane, 2,2-bis (4-aminophenyl) hexafluoropropane, 4,4 '-(p-phenylenediisopropylidene ) Bisaniline, 4,4 '-(m-phenylenediisopropylidene) bisaniline, 1,4-cyclohexanediamine, 4,4'-methylenebis (cyclohexylamine), 1,4-bis (4- Aminophenoxy) benzene, 4,4'-bis (4-aminophenoxy) biphenyl, 2 , 6-diaminopyridine, 3,4-diaminopyridine, 2,4-diaminopyrimidine, 3,6-diaminoacridine, 3,6-diaminocarbazole, N-methyl-3,6- Diaminocarbazole, N-ethyl-3,6-diaminocarbazole or N-phenyl-3,6-diaminocarbazole are preferred, more preferably p-phenylenediamine, 2-methyl-1, 4-phenylenediamine, 2-ethyl-1,4-phenylenediamine, 2,5-dimethyl-1,4-phenylenediamine, 2,5-diethyl-1,4-phenylenediamine or 2,3 , 5,6-tetramethyl-1,4-phenylenediamine.

When improving the pretilt angle expression property of the liquid crystal aligning agent of this invention, in addition to the specific diamine and the said other diamine used arbitrarily, it is further a following general formula (Q-1)

Wherein X ² is a single bond, —O—, —CO—, —COO—, —OCO—, —NHCO—, —CONH—, —S— or an arylene group, and R ¹² has 10 to 20 carbon atoms An alkyl group, a monovalent organic group having an alicyclic skeleton having 4 to 40 carbon atoms or a monovalent organic group having a fluorine atom having 6 to 20 carbon atoms), and the following general formula (Q-2)

Wherein X ³ is a single bond, —O—, —CO—, —COO—, —OCO—, —NHCO—, —CONH—, —S— or an arylene group, and R ¹³ is an alicyclic ring having 4 to 40 carbon atoms Divalent organic group having a formula skeleton)

One or more diamines selected from the diamine group represented by can be used in combination. These can be used individually by 1 type or in combination of 2 or more types.

In the formula (Q-1), examples of the alkyl group having 10 to 20 carbon atoms represented by R ¹² include, for example, n-decyl group, n-dodecyl group, n-pentadecyl group, n-hexadecyl group and n- An octadecyl group, n-eicosyl group, etc. are mentioned.

As a monovalent or divalent organic group which has a C4-C40 alicyclic skeleton represented by R <^12> in the said General formula (Q-1) and R <^13> in the said General formula (Q-2), it is cyclobutane, for example. A group having an alicyclic skeleton derived from a cycloalkane such as cyclopentane, cyclohexane and cyclodecane; Groups having a steroid skeleton such as cholesterol and cholestanol; The group which has alicyclic skeleton which has bridges, such as norbornene and adamantane, etc. are mentioned. Among these, particularly preferred are groups having a steroid skeleton. The organic group having an alicyclic skeleton may be substituted with some or all of the hydrogen atoms it has in a halogen atom, preferably a fluorine atom or a fluoroalkyl group, preferably a trifluoromethyl group.

As a group which has a C6-C20 fluorine atom represented by R <^12> in the said General formula (Q-1), For example, C6-C20, such as n-hexyl group, n-octyl group, n-decyl group, etc. Linear alkyl groups; Alicyclic hydrocarbon groups having 6 to 20 carbon atoms such as a cyclohexyl group and a cyclooctyl group; The group which substituted one part or all part of the hydrogen atom in organic groups, such as a C6-C20 aromatic hydrocarbon group, such as a phenyl group and a biphenyl group, with fluoroalkyl groups, such as a fluorine atom or a trifluoromethyl group, is mentioned.

X ² in Formula (Q-1) and X ³ in Formula (Q-2) are a single bond, -O-, -CO-, -COO-, -OCO-, -NHCO-, -CONH- Although, -S- or an arylene group, as an arylene group, a phenylene group, a tolylene group, a biphenylene group, a naphthylene group, etc. are mentioned, for example. Especially as X <^2> and X <^3> , group represented by -O-, -COO-, -OCO- is preferable.

As a preferable specific example of the diamine which has group represented by the said General formula (Q-1), dodecaneoxy-2,4-diaminobenzene, pentadecaneoxy-2,4-diaminobenzene, hexadecaneoxy-2,4- Diaminobenzene, octadecaneoxy-2,4-diaminobenzene or the following general formulas (17) to (26)

The compound represented by these is mentioned. As a preferable specific example of the diamine which has group represented by the said General formula (Q-2), following General formula (27)-(29)

The compound represented by these is mentioned.

Among these, the compound represented by the said general formula (17), (18), (23), (24) or (27) is mentioned as a especially preferable thing.

When using a specific diamine and other diamine and / or the diamine represented by the said general formula (Q-1) or (Q-2) in the synthesis | combination of a specific polyamic acid, the use ratio of specific diamine is 1 mol% with respect to all diamine. It is preferable that it is above, and it is more preferable that it is 5 mol%.

<Synthesis of specific polyamic acid>

Next, the synthesis | combining method of the specific polyamic acid which the liquid crystal aligning agent of this invention can contain is demonstrated.

The specific polyamic acid is the specific tetracarboxylic dianhydride and optionally other tetracarboxylic dianhydride and the specific diamine and optionally other diamine, preferably in an organic solvent, preferably from -20 ° C to 150 It can synthesize | combine by making it react at 0 degreeC, More preferably, 0 to 100 degreeC, Preferably 0.5 to 72 hours.

The use ratio of the tetracarboxylic dianhydride and the diamine provided in the synthesis reaction of the specific polyamic acid is preferably such that the acid anhydride group of the tetracarboxylic dianhydride is 0.5 to 2 equivalents to 1 equivalent of the amino group of the diamine. Preferably it is the ratio used as 0.7 to 1.2 equivalent.

The organic solvent is not particularly limited as long as it can dissolve the specific polyamic acid synthesized. For example, 1-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide Amide solvents such as 3-butoxy-N, N-dimethylpropanamide, 3-methoxy-N, N-dimethylpropanamide, 3-hexyloxy-N, N-dimethylpropanamide, dimethyl sulfoxide, aprotic polar solvents such as γ-butyrolactone, tetramethylurea and hexamethylphosphortriamide; Phenol solvents, such as m-cresol, xylenol, a phenol, and a halogenated phenol, can be illustrated. Moreover, it is preferable that the usage-amount ((alpha)) of an organic solvent is an amount which the ratio (monomer concentration) with respect to whole quantity ((alpha) + (beta)) of the total amount ((beta)) of tetracarboxylic dianhydride and a diamine compound becomes 0.1-30 weight%. Do.

In the organic solvent, alcohol, ketones, esters, ethers, halogenated hydrocarbons, hydrocarbons, and the like, which are poor solvents of specific polyamic acids, may be used in combination without causing specific polyamic acid to be precipitated. Specific examples of such a poor solvent include methanol, ethanol, isopropanol, cyclohexanol, 4-hydroxy-4-methyl-2-pentanone, ethylene glycol, propylene glycol, 1,4-butanediol, triethylene glycol, Ethylene glycol monomethyl ether, ethyl lactate, butyl lactate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, methyl methoxy propionate, ethyl ethoxy propionate, Diethyl oxalate, diethyl malonate, diethyl ether, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol-n-propyl ether, ethylene glycol-i-propyl ether, ethylene glycol-n-butyl ether, ethylene glycol dimethyl ether , Ethylene glycol ethyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol monomethyl ether, di Tylene glycol monoethyl ether, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, tetrahydrofuran, dichloromethane, 1,2-dichloroethane, 1,4-dichlorobutane, trichloroethane, chlorobenzene, o-dichlorobenzene, hexane, heptane, octane, benzene, toluene, xylene, isoamylpropionate, isoamylisobutyrate, diisopentyl ether and the like.

As described above, a reaction solution obtained by dissolving a specific polyamic acid is obtained. Then, the reaction solution is poured into a large amount of poor solvent to obtain a precipitate, and the precipitate is dried under reduced pressure or the reaction solution is distilled off under reduced pressure with a evaporator to obtain a polyamic acid. Moreover, specific polyamic acid can be refine | purified by performing the process of dissolving this specific polyamic acid again in an organic solvent, and then depositing with a poor solvent or distilling off under reduced pressure with an evaporator once or several times.

<The synthesis method of the imidation polymer of specific polyamic acid>

Next, the synthesis | combining method of the imidation polymer of the specific polyamic acid which the liquid crystal aligning agent of this invention can contain is demonstrated.

The imidation polymer of a specific polyamic acid can be synthesize | combined by dehydrating and ring-closing part or all of the amic-acid structure which the said specific polyamic acid has. The imidation polymer which can be used for this invention is 40 mol% or more, Preferably it is 50 mol% or more of the ratio of the repeating unit which has an imide ring in all the repeating units (henceforth "imidation ratio"). By using the polymer whose imidation ratio is 40 mol% or more, it becomes possible to shorten the afterimage erase time of the liquid crystal aligning film obtained.

The dehydration ring closure reaction of a specific polyamic acid may be carried out by (i) heating the specific polyamic acid or (ii) dissolving the specific polyamic acid in an organic solvent, adding a dehydrating agent and a dehydrating ring closure catalyst in this solution, and heating as necessary. Is done.

The reaction temperature in the method of heating the specific polyamic acid of said (i) becomes like this. Preferably it is 50-200 degreeC, More preferably, it is 60-170 degreeC. When reaction temperature is less than 50 degreeC, dehydration ring-closure reaction does not fully advance, but when reaction temperature exceeds 200 degreeC, the molecular weight of the imidation polymer obtained may fall.

On the other hand, in the method of adding a dehydrating agent and a dehydration ring-closure catalyst to the solution of the specific polyamic acid of said (ii), As an dehydrating agent, acid anhydrides, such as acetic anhydride, a propionic anhydride, and trifluoroacetic anhydride, can be used, for example. . Although the usage-amount of a dehydrating agent depends on a desired imidation ratio, it is preferable to set it as 0.01-20 mol with respect to 1 mol of repeating units of a specific polyamic acid. As the dehydration ring closure catalyst, tertiary amines such as pyridine, collidine, lutidine and triethylamine can be used, for example. However, it is not limited to these. It is preferable that the usage-amount of a dehydration ring-closure catalyst shall be 0.01-10 mol with respect to 1 mol of dehydrating agents used. The imidation ratio can be made higher, so that the usage-amount of the said dehydrating agent and dehydration ring closure agent is large. As an organic solvent used for a dehydration ring-closure reaction, the organic solvent illustrated as what is used for the synthesis | combination of a specific polyamic acid is mentioned. The reaction temperature of the dehydration ring closure reaction is preferably 0 to 180 ° C, more preferably 10 to 150 ° C. Thus obtained imidized polymer can be refine | purified by performing the same operation as the purification method of a specific polyamic acid with respect to the obtained reaction solution.

<End modified polymer>

Certain polyamic acids or imidized polymers thereof used in the present invention may be of terminally modified type with controlled molecular weight. By using a terminal modified polymer, the effect of this invention is not impaired, and the application | coating characteristic of a liquid crystal aligning agent, etc. can be improved. Such a terminal modified polymer can be synthesized by adding an acid anhydride, a monoamine compound, a monoisocyanate compound, or the like to the reaction system when synthesizing a specific polyamic acid. Here, as an acid anhydride, maleic anhydride, a phthalic anhydride, itaconic anhydride, n-decyl succinic anhydride, n-dodecyl succinic anhydride, n- tetradecyl succinic anhydride, n-hexadecyl succinic anhydride etc. are mentioned, for example. Can be. Examples of the monoamine compound include aniline, cyclohexylamine, n-butylamine, n-pentylamine, n-hexylamine, n-heptylamine, n-octylamine, n-nonylamine, n-decylamine, n Undecylamine, n-dodecylamine, n-tridecylamine, n-tetradecylamine, n-pentadecylamine, n-hexadecylamine, n-heptadecylamine, n-octadecylamine, n-eico Silamine etc. are mentioned. As a monoisocyanate compound, phenyl isocyanate, naphthyl isocyanate, etc. are mentioned, for example.

<Solution Viscosity of Polymer>

It is preferable that the specific polyamic acid obtained by the above and its imidation polymer have a viscosity of 20-800 mPa * s, and, as for 10% solution, it is more preferable to have a viscosity of 30-500 mPa * s.

In addition, the solution viscosity (mPa * s) of the polymer was measured at 25 degreeC using the E-type rotational viscometer with respect to the solution diluted to 10% of solid content concentration using the predetermined solvent.

<Other polymer>

In the liquid crystal aligning agent of this invention, unless the effect of this invention is impaired, 1 or more types chosen from the group which consists of a part of said specific polyamic acid or its imidation polymer from another polyamic acid and its imidation polymer ( Or "other polymers").

The other polymer is not particularly limited as long as it is a polyamic acid other than the specific polyamic acid or an imidized polymer thereof, but is preferably a polymer obtained by the reaction of the other tetracarboxylic dianhydride and another diamine or an imidized polymer thereof. Do. As another tetracarboxylic dianhydride used here, alicyclic tetracarboxylic dianhydride or aromatic tetracarboxylic dianhydride is preferable, and 1,2,3,4-cyclobutanetetracarboxylic dianhydride is especially preferable. Pyromellitic dianhydride is preferred. As another diamine used here, aromatic diamine is preferable and 4, 4- diamino diphenylmethane is especially preferable.

The synthesis of these other polymers can be carried out in the same manner as the synthesis of the specific polyamic acid and its imidized polymer, using other tetracarboxylic dianhydride and other diamine in place of the specific tetracarboxylic dianhydride and the specific diamine.

When the liquid crystal aligning agent of this invention contains another polymer, the use ratio of another polymer becomes like this. Preferably it is 80 weight% or less with respect to the total amount of a specific polyamic acid and its imidation polymer, and another polymer, More preferably, 60 It is weight% or less.

<Organic Silicon Compound>

The liquid crystal aligning agent of this invention contains the compound represented by the said Formula (7) (henceforth "organic silicon compound").

As the methylene group or the polymethylene group of R ⁵ of group X ¹ in formula (7), for example, -CH ₂ -,-(CH ₂ ) ₂ -,-(CH ₂ ) ₃ -,-( CH ₂ ) ₄ -and the like. As an alkyl group of R <^6> , a C1-C10 alkyl group is preferable.

The use ratio of the organosilicon compound in the liquid crystal aligning agent of this invention is called the total amount of a specific polyamic acid and its imidation polymer (henceforth "the total amount of a polymer.") The liquid crystal aligning agent of this invention contains another polymer. "Total amount of polymer" refers to the total amount of a specific polyamic acid and its imidized polymer and other polymers. The same) is preferably 0.01 to 3 parts by weight, more preferably 0.1 to about 100 parts by weight. 2 parts by weight. By setting it as the usage ratio of this range, it can be set as the liquid crystal aligning agent which can form the liquid crystal aligning film which was excellent in printability and excellent in electrical characteristics.

<Other additives>

Although the liquid crystal aligning agent of this invention contains at least 1 sort (s) chosen from the group which consists of the said specific polyamic acid and its imidation polymer, an organosilicon compound and the solvent mentioned later as an essential component, in the range which does not impair the effect of this invention. It may contain other additives. As such another additive, the compound which has two or more epoxy groups in a molecule | numerator, functional silane containing compounds other than the said organosilicon compound (henceforth "other functional silane compound"), etc. are mentioned.

The compound which has two or more epoxy groups in the said molecule (henceforth "epoxy compound") can be added in order to improve the printability of the liquid crystal aligning film obtained from the liquid crystal aligning agent of this invention further. Specific examples of such epoxy compounds include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, and polypropylene glycol diglycidyl. Ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, 1,3, 5,6-tetraglycidyl-2,4-hexanediol, N, N, N ', N'-tetraglycidyl-m-xylenediamine, 1,3-bis (N, N-diglycidyl Aminomethyl) cyclohexane, N, N, N ', N'-tetraglycidyl-4,4'-diaminodiphenylmethane, 3- (N-allyl-N-glycidyl) aminopropyltrimethoxy Silane, 3- (N, N- diglycidyl) aminopropyltrimethoxysilane, N, N- diglycidyl-benzylamine, N, N- diglycidyl-aminomethylcyclohexane and the like are preferred. Can be mentioned. The use ratio of the epoxy compound in the liquid crystal aligning agent of this invention is 50 weight part or less with respect to 100 weight part of total amounts of a polymer, More preferably, it is 0.1-40 weight part, More preferably, it is 1-30 Parts by weight.

The other functional silane containing compound can be added from the viewpoint of further improving the adhesiveness to the board | substrate of the liquid crystal aligning film obtained from the liquid crystal aligning agent of this invention. As a specific example of such other functional silane containing compound, 3-aminopropyl trimethoxysilane, 3-aminopropyl triethoxysilane, 2-aminopropyl trimethoxysilane, 2-aminopropyl triethoxysilane, for example. , N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-ureidopropyltrimethoxysilane, 3- Ureidopropyltriethoxysilane, N-ethoxycarbonyl-3-aminopropyltrimethoxysilane, N-ethoxycarbonyl-3-aminopropyltriethoxysilane, N-triethoxysilylpropyltriethylenetri Amine, N-trimethoxysilylpropyltriethylenetriamine, 10-trimethoxysilyl-1,4,7-triazadecan, 10-triethoxysilyl-1,4,7-triazadecan, 9- Trimethoxysilyl-3,6-diazanonyl acetate, 9-triethoxysilyl-3,6-diazanyl acetate, N-benzyl-3-aminopropyl Limethoxysilane, N-benzyl-3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltriethoxysilane, N-bis (oxyethylene) 3-aminopropyl trimethoxysilane, N-bis (oxyethylene) -3-aminopropyl triethoxysilane, etc. are mentioned. The compounding ratio of these other functional silane containing compounds becomes like this. Preferably it is 10 weight part or less with respect to 100 weight part of total amounts of a polymer, More preferably, it is 0.01-5 weight part.

<Solvent>

As a solvent which the liquid crystal aligning agent of this invention contains, an organic solvent is preferable and the solvent illustrated as what is used for the synthesis reaction of a specific polyamic acid is mentioned. Moreover, the poor solvent illustrated as what can be used together at the time of the synthesis reaction of a specific polyamic acid can also be selected suitably, and can be used together.

As an especially preferable organic solvent used for the liquid crystal aligning agent of this invention, 1-methyl- 2-pyrrolidone, (gamma) -butyrolactone, (gamma) -butyrolactam, N, N- dimethylformamide, N, N-dimethylacetamide, 4-hydroxy-4-methyl-2-pentanone, ethylene glycol monomethyl ether, butyl lactate, butyl acetate, methyl methoxy propionate, ethyl ethoxy propionate, ethylene glycol methyl ether , Ethylene glycol ethyl ether, ethylene glycol-n-propyl ether, ethylene glycol-i-propyl ether, ethylene glycol-n-butyl ether (butyl cellosolve), ethylene glycol dimethyl ether, ethylene glycol ethyl ether acetate, diethylene glycol Dimethyl ether, diethylene glycol diethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether Tate, 3-butoxy-N, N-dimethylpropanamide, 3-methoxy-N, N-dimethylpropanamide, 3-hexyloxy-N, N-dimethylpropanamide, diethylcarbitol, ethylcarbitol Acetate, butyl carbitol, triethylene glycol dimethyl ether, isoamyl isobutyrate, diisopentyl ether, etc. are mentioned. These can be used independently, or can mix and use 2 or more types. A particularly preferable solvent composition is a composition obtained by combining the above solvents, in which a polymer does not precipitate in the alignment agent, and the surface tension of the alignment agent is in a range of 25 to 40 mN / m.

<Liquid crystal aligning agent>

Although the liquid crystal aligning agent of this invention makes at least 1 sort (s) chosen from the group which consists of said specific polyamic acid and its imidation polymer, an organosilicon compound and a solvent as an essential component, and optionally contains other additives, Preferably it is a liquid crystal Components other than the solvent in an aligning agent are manufactured as a solution state melt | dissolved in the solvent.

The solid content concentration (the value obtained by dividing the total weight of components other than the solvent in the liquid crystal aligning agent by the total weight of the liquid crystal aligning agent) in the liquid crystal aligning agent of the present invention is selected in consideration of viscosity, volatility, and the like, but preferably 1 to 10 It is the range of weight%. That is, although the liquid crystal aligning agent of this invention is apply | coated to the surface of a board | substrate, and the coating film which becomes a liquid crystal aligning film is formed, when solid content concentration is less than 1 weight%, the film thickness of this coating film becomes too small and a favorable liquid crystal aligning film cannot be obtained, When solid content concentration exceeds 10 weight%, the film thickness of a coating film may become large too much and a favorable liquid crystal aligning film may not be obtained, and the viscosity of a liquid crystal aligning agent may increase and coating characteristics may fall.

On the other hand, the range of especially preferable solid content concentration changes with the method used when apply | coating a liquid crystal aligning agent to a board | substrate. For example, in the case of a spinner method, the range of 1.5 to 4.5 weight% is especially preferable. In the case of the printing method, it is particularly preferable that the solid content concentration is in the range of 3 to 9% by weight, and the solution viscosity is in the range of 12 to 50 mPa · s. When using the inkjet method, it is especially preferable to make solid content concentration into the range of 1 to 5 weight%, and to make solution viscosity into the range of 3-15 mPa * s.

The temperature at the time of manufacturing the liquid crystal aligning agent of this invention becomes like this. Preferably it is 0 degreeC-200 degreeC, More preferably, it is 20 degreeC-60 degreeC.

<Liquid crystal display element>

The liquid crystal display element of this invention is equipped with the liquid crystal aligning film obtained from the liquid crystal aligning agent of this invention obtained as mentioned above, It is characterized by the above-mentioned.

The liquid crystal display element of this invention can be manufactured by following process (1)-(3), for example.

(1) The liquid crystal aligning agent of this invention is apply | coated to the one surface of the board | substrate with which the patterned transparent conductive film is provided by appropriate coating methods, such as an offset printing method, a spin coating method, and an inkjet printing method, and then a coating film is heated by heating a coated surface. To form. Here, as a board | substrate, For example, glass, such as float glass and a soda glass; Transparent substrates containing plastics such as polyethylene terephthalate, polybutylene terephthalate, polyether sulfone and polycarbonate can be used. Examples of the transparent conductive film provided on one surface of the substrate include an NESA film containing tin oxide (SnO ₂ ) (registered trademark of PPG Co., Ltd. USA), an ITO film containing indium tin oxide (In ₂ O ₃ -SnO ₂ ), and the like. The transparent conductive film can be used, and the method of photo-etching, the method of using a preliminary mask, when forming a transparent conductive film are used for patterning of these transparent conductive films. In application | coating of a liquid crystal aligning agent, in order to make adhesiveness of a board | substrate surface, a transparent conductive film, and a coating film more favorable, you may apply | coat a functional silane containing compound, a functional titanium containing compound, etc. previously on the said surface of a board | substrate. . The heating temperature after apply | coating a liquid crystal aligning agent becomes like this. Preferably it is 80-300 degreeC, More preferably, it is 120-250 degreeC. On the other hand, although the liquid crystal aligning agent of this invention forms the coating film used as an oriented film by removing an organic solvent after application | coating, when the liquid crystal aligning agent of this invention contains the polymer which has an amic acid structure, it heats further after coating film formation. The dehydration ring closure of the acid structure can also be advanced to obtain a more imidized coating film.

The film thickness of the coating film formed becomes like this. Preferably it is 0.001-1 micrometer, More preferably, it is 0.005-0.5 micrometer.

(2) Next, the rubbing process which rubs in a fixed direction on the coating film surface formed as mentioned above with the roll which wound the cloth which consists of fibers, such as nylon, rayon, cotton, for example normally is performed. Thereby, the orientation ability of a liquid crystal molecule is provided to a coating film, and it becomes a liquid crystal aligning film. Moreover, the said patent document 2 (Unexamined-Japanese-Patent No. 6-222366) and the said patent document 3 (Unexamined-Japanese-Patent No. 6-281937) to the liquid crystal aligning film formed by the liquid crystal aligning agent of this invention, for example. Treatment such as changing the pretilt angle by partially irradiating ultraviolet rays as disclosed in Japanese Patent Application Publication) or rubbing as disclosed in Japanese Patent Application Laid-Open No. 5-107544. A liquid crystal display is formed by partially forming a resist film on the surface of the treated liquid crystal alignment film, performing a rubbing treatment in a direction different from the preceding rubbing treatment, and then removing the resist film to change the liquid crystal alignment ability of the liquid crystal alignment film. It is possible to improve the clock characteristics of the device.

(3) Two board | substrates with a liquid crystal aligning film were manufactured similarly to said (1) or (2), and two board | substrates were made clearance gap (cell gap) so that the rubbing direction in each liquid crystal aligning film may be orthogonal or antiparallel. It arrange | positions through and opposes the peripheral part of two board | substrates with a sealing agent, injects and fills a liquid crystal in the cell gap partitioned by the board | substrate surface and a sealing agent, and seals an injection hole, and comprises a liquid crystal cell. Then, the polarizing plate is bonded to the outer surface of the liquid crystal cell, that is, the other surface side of each substrate constituting the liquid crystal cell so that its polarization direction is coincident with or perpendicular to the rubbing direction of the liquid crystal alignment film formed on one surface of the substrate. A display element is obtained. Here, as a sealing agent, the epoxy resin etc. which contain the hardening agent and aluminum oxide sphere as a spacer can be used, for example. Examples of the liquid crystals include nematic liquid crystals and smectic liquid crystals. Among them, nematic liquid crystals are preferred, and for example, Schiff base liquid crystals, subfamily clock liquid crystals, biphenyl liquid crystals, phenylcyclohexane liquid crystals and ester liquid crystals. , Terphenyl-based liquid crystal, biphenylcyclohexane-based liquid crystal, pyrimidine-based liquid crystal, dioxane-based liquid crystal, bicyclooctane-based liquid crystal, kuban-based liquid crystal and the like can be used. Moreover, it is sold to these liquid crystals as cholesteric liquid crystals, such as cholestyl chloride, cholesteryl nonaate, a cholesteryl carbonate, and brand names "C-15", "CB-15" (made by Merck), for example. It is also possible to add and use a chiral agent. Ferroelectric liquid crystals such as p-decyloxybenzylidene-p-amino-2-methylbutylcinnamate can also be used.

As a polarizing plate bonded to the outer surface of a liquid crystal cell, the polarizing plate containing the polarizing plate called H film which absorbed iodine, and extending | stretching polyvinyl alcohol between the cellulose acetate protective films, or the polarizing plate containing H film itself is mentioned.

<Example>

Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not restrict | limited to these Examples.

Evaluation of the liquid crystal aligning agent manufactured by the following example and the comparative example followed the following method.

[Printability Evaluation]

A 127 mm (D) x 127 mm (W) x 1.1 mm (H) glass substrate having an ITO film formed thereon as a transparent electrode on one surface thereof was prepared, and a printing machine (Nippon Shashin) The liquid crystal aligning agent of 5 weight% of solid content concentration obtained by each Example or the comparative example using the Tsu Corporation make, a model name "Angstromer S-40L") was filtered with the microfilter of 0.2 micrometer of pore diameters, and then a transparent electrode It was applied to cotton. The board | substrate after application | coating removed the solvent with the hotplate adhesive predryer set to 80 degreeC, and then heated at 200 degreeC for 10 minutes, and formed the coating film of about 0.06 micrometers in thickness on the glass substrate with an ITO film. This coating film was visually observed with a microscope, and the "good" case where there was no pinhole or coating nonuniformity, and the case where the pinhole or coating nonuniformity (film thickness nonuniformity etc.) were observed insignificantly "good", and the pinhole or coating nonuniformity remarkably If observed, it was determined to be "bad".

[Evaluation of Voltage Retention Rate]

The above-described printing was carried out except that a glass substrate having a patterned ITO electrode having a thickness of about 1 mm was formed on one side, and a liquid crystal aligning agent having a solid content concentration of 3.5 wt% obtained in each Example or Comparative Example as a liquid crystal aligning agent. In the same manner as in the [evaluation of properties], a pair (two pieces) of glass substrates having a coating film having a thickness of about 0.06 μm was manufactured.

Next, after apply | coating the aluminum oxide sphere containing epoxy resin adhesive of diameter 5.5micrometer leaving a liquid crystal injection hole in each outer edge which has a liquid crystal aligning film of the said liquid crystal aligning film application board | substrate of a pair of transparent electrode / transparent board | substrate, a liquid crystal aligning film surface The laminates were pressed so as to face each other, and the adhesive was cured. Subsequently, after filling a nematic liquid crystal (negative type | mold, Merck make, MLC-6608) between board | substrates from a liquid crystal inlet, the liquid crystal inlet is sealed with acrylic photocuring adhesive, and a polarizing plate is bonded to both surfaces of the outer side of a board | substrate, and a liquid A positive display device was manufactured.

About this liquid crystal display element, after applying the voltage of 5V by 60 microseconds application time and the span of 16.7 milliseconds at room temperature, the voltage retention after 16.7 milliseconds after application | release cancellation was measured. The measurement apparatus used VHR-1 by Toyo Technica.

[Evaluation of the department]

A liquid crystal display device was manufactured in the same manner as in [Evaluation of Voltage Retention], except that a glass substrate having an ITO film having a pattern as shown in FIG. 1 on one side was used.

About this liquid crystal display element, DC voltage 6.0V was applied to electrode A and DC voltage 0.5V was applied to electrode B for 24 hours at room temperature. After the voltage was removed, direct current voltages 0.1 to 5.0 V were applied to the electrodes A and B at 0.1 V pitch, respectively, and the baking characteristics were judged by the luminance difference between the electrodes A and B at the respective voltages. That is, it was judged that the baking characteristic was bad when the luminance difference was large. (Circle) which a baking was not seen at all and the thing where a baking was weak were set as (triangle | delta).

Synthesis Example

<Synthesis example of specific diamine>

Synthesis Example A-1 (Synthesis of 1- (3,5-diaminophenyl) -3-octadecylsuccinimide)

12.81 g (0.07 mol) of 3,5-dinitroaniline and 70 mL of acetic acid were added to a 300 mL three necked flask substituted with nitrogen gas, and the solid was dissolved by stirring while flowing nitrogen gas. To this was added 24.64 g (0.07 mol) of octadecyl succinic anhydride and reacted by refluxing for 20 hours under nitrogen. After cooling the reaction solution to room temperature, 70 mL of methanol was added and the mixture was allowed to stand overnight. The precipitated solid was separated by filtration, washed with methanol and dried to obtain 30 g of 1- (3,5-dinitrophenyl) -3-octadecylsuccinimide (yield 83%).

Next, 30 g (0.058 mol) of 1- (3,5-dinitrophenyl) -3-octadecylsuccinimide synthesized above in a 500 mL flask substituted with nitrogen gas, 100 mL of ethanol, tetrahydrofuran 100 mL of (THF) and 25 g of reduced catalyst palladium carbon (Pd / C) were added, and the mixture was stirred at 70 ° C for 1 hour. 42.5 mL (43.75 g) of hydrazine monohydrate was added thereto, and the mixture was reacted by heating under reflux for 6 hours. Pd / C was filtered off and the filtrate was concentrated on a rotary evaporator. The resulting crude product was dissolved in N-methyl-2-pyrrolidone by heating, cooled, and recrystallized to give 14.6 g (0.032) of 1- (3,5-diaminophenyl) -3-octadecylsuccinimide as a target product. mol, yield 55%) was obtained.

Synthesis Example A-2 (Synthesis of 1- (3,5-diaminophenyl) -3-dodecylsuccinimide)

1- (3,5-diaminophenyl) -3 in the same manner as in Synthesis Example A-1, except that 18.76 g (0.07 mol) of dodecyl succinic anhydride was used instead of 24.64 g (0.07 mol) of octadecyl succinic anhydride. -11 g (0.030 mol, yield 51%) of dodecyl succinimide was obtained.

Synthesis Example A-3 (Synthesis of 1- (3,5-diaminophenyl) -3-heptadecyl-4-methylmaleimide)

31.5 g (0.25 mol) of dimethylmaleic anhydride, 89.0 g (0.5 mol) of N-bromosuccinimide, 1.0 g (4.15 mmol) of benzoyl peroxide and 1,500 mL of carbon tetrachloride were added to a 2,000 mL three-necked flask with nitrogen substitution. It was heated to reflux for 5 hours. The reaction solution was cooled to room temperature, left at room temperature overnight, and then filtered. After washing the filtrate with water, the organic layer was concentrated on a rotary evaporator. The crude oily product obtained was distilled under high vacuum (120 to 125 ° C / 2 mmHg) to obtain 20.0 g (0.1 mol, 39% yield) of 3-bromomethyl-4-methylmaleic anhydride as an intermediate.

Next, in a 2,000 mL three-necked flask substituted with argon gas, 16.4 g (80 mmol) of 3-bromomethyl-4-methylmaleic anhydride obtained above, copper iodide 1.52 g (8.0 mmol), diethyl ether 400 mL and 160 mL of HMPA (hexamethyl phosphate triamide) were added and then cooled to -5 to 0 ° C under argon gas flow. While stirring this mixed liquid, the solution which melt | dissolved 400 mmol of prepared hexadecyl magnesium bromide in 400 mL of diethyl ether was dripped over about 20 minutes. The mixture was returned to room temperature and stirred for further 8 hours. After dilution with 600 mL of diethyl ether, 600 mL of 4N-sulfuric acid was added to make the solution acidic. The separated aqueous layer was further washed with diethyl ether 600 mL, and the organic layers were combined. The organic layer was washed with water, dehydrated with sodium sulfate, and the solution was concentrated with a rotary evaporator to obtain an oily crude product. This crude product was purified by a silica gel column using a petroleum ether / ethyl acetate (19: 1) mixed solution as a developing solvent, to obtain 14.0 g (0.04 mol, 50% yield of 3-heptadecyl-4-methylmaleic anhydride). )

Next, 6.4 g (0.035 mol) of 3,5-dinitroaniline and 35 mL of acetic acid were added to a 200 mL three-necked flask with nitrogen gas substitution. The solid was dissolved by stirring while flowing nitrogen gas. To this, 12.3 g (0.035 mol) of 3-heptadecyl-4-methylmaleic anhydride obtained above was added and reacted under reflux for 20 hours under nitrogen. After cooling the reaction solution to room temperature, 35 mL of methanol was added and the mixture was allowed to stand overnight. The solid was separated by filtration, washed with methanol and dried to obtain 14.6 g (0.029 mol, 81% yield) of 1- (3,5-dinitrophenyl) -3-heptadecyl-4-methylmaleimide.

Next, 13.4 g (0.026 mol) of 1- (3,5-dinitrophenyl) -3-heptadecyl-4-methylmaleimide, 50 mL of ethanol, 50 mL of THF and a reduction catalyst were placed in a nitrogen gas substituted 300 mL flask. 12.5 g of Pd / C were added and stirred at 70 ° C for 1 hour. Subsequently, 19 mL (19.6 g) of hydrazine monohydrate was added and reacted by heating under reflux for 6 hours. Pd / C was filtered off and the filtrate was concentrated on a rotary evaporator. The obtained crude product was recrystallized by heating and dissolving with N-methyl-2-pyrrolidone and cooling to obtain 6.6 g of 1- (3,5-diaminophenyl) -3-heptadecyl-4-methylmaleimide as a target product. 0.015 mol, yield 56%) was obtained.

Synthesis Example A-4 (Synthesis of 1- (3,5-diaminophenyl) -3-hexadecaneoxymethyl-4-methylmaleimide)

12.81 g (0.07 mol) of 3,5-dinitroaniline and 70 mL of acetic acid were added to a nitrogen-substituted 300 mL three-necked flask, followed by stirring while flowing nitrogen gas to dissolve the solid. 14.35 g (0.07 mol) of 3- (bromomethyl) -4-methylmaleic anhydride synthesized in the same manner as in the intermediate of Synthesis Example A-3 was added thereto, and the mixture was reacted under reflux for 20 hours under nitrogen. After cooling the reaction solution to room temperature, 70 mL of methanol was added and the mixture was allowed to stand overnight. The solid was separated by filtration, washed with methanol and dried to obtain 18.9 g (0.051 mol, 73% yield) of 1- (3,5-dinitrophenyl) -3-bromomethyl-4-methylmaleimide.

Next, 18.1 g (0.049 mol) of 1- (3,5-dinitrophenyl) -3-bromomethyl-4-methylmaleimide, and 1-hexadecanol sodium salt 12.9 in the 500 mL three neck flask which carried out the nitrogen substitution. g (0.049 mol) and 100 mL of dimethyl sulfoxide were added, followed by stirring at 100 ° C. for 10 hours. After cooling the reaction solution to room temperature, 70 mL of methanol was added and the mixture was allowed to stand overnight. The solid was separated by filtration, washed with methanol and dried to obtain 20.8 g (0.039 mol, yield 80%) of 1- (3,5-dinitrophenyl) -3-hexadecaneoxymethyl-4-methylmaleimide. .

Next, 13.8 g (0.026 mol) of 1- (3,5-dinitrophenyl) -3-hexadecaneoxymethyl-4-methylmaleimide, 300 mL of ethanol, 50 mL of THF, 12.5 g of reduction catalyst Pd / C were added and stirred at 70 ° C for 1 hour. 19 mL (19.6 g) of hydrazine monohydrate was then added and reacted by heating to reflux for 6 hours. Pd / C was filtered off and the filtrate was concentrated on a rotary evaporator. The obtained crude product was recrystallized by heating and dissolving with N-methyl-2-pyrrolidone and cooling to obtain 1- (3,5-diaminophenyl) -3-hexadecaneoxymethyl-4-methylmaleimide 8.2 as a target product. g (0.018 mol, yield 67%) was obtained.

<Synthesis of specific polyamic acid and imidized polymer thereof>

Synthesis Examples P-1 to P-8

To N-methylpyrrolidone, diamine and tetracarboxylic dianhydride were added in this order in the composition shown in Table 1 below to obtain a solution having a monomer concentration of 20% by weight, and reacted at 60 ° C for 4 hours to give polyamic acid (A- Solutions containing 1) to (A-8) were obtained. To each of the obtained polyamic acid solutions, 3.0 times mole of pyridine and 3.0 times mole of acetic anhydride were respectively added to the total amount of amic acid units in the solution, followed by heating to 110 ° C. for a dehydration ring closing reaction for 4 hours. The obtained solution was reprecipitated with diethyl ether, recovered and dried under reduced pressure to obtain (B-1) to (B-8) which were imidized polymers. The imidation ratio of these imidation polymers is shown in Table 1.

Synthesis Example P-9 and P-10

Polyamic acid (A-9) and (A-10) were obtained similarly to synthesis examples P-1 to P-8 except having used the thing of Table 1 as diamine and tetracarboxylic dianhydride. On the other hand, in Synthesis Examples P-9 and P-10, the dehydration ring closure reaction of the polyamic acid was not performed.

In Table 1, the number in parentheses shows a content ratio (molar ratio) with respect to diamine and tetracarboxylic dianhydride, and the meaning of abbreviation in a table | surface is as follows.

<Diamine>

Specific diamine A: 1- (3,5-diaminophenyl) -3-octadecylsuccinimide

Particular diamine B: 1- (3,5-diaminophenyl) -3-dodecylsuccinimide

Particular diamine C: 1- (3,5-diaminophenyl) -3-heptadecyl-4-methylmaleimide

Specific diamine D: 1- (3,5-diaminophenyl) -3-hexadecaneoxymethyl-4-methylmaleimide

Diamine 1: 4,4'-diaminodiphenylmethane

Tetracarboxylic dianhydride

T-1: 2,3,5-tricarboxycyclopentyl acetic dianhydride

T-2: 5- (2,5-dioxotetrahydro-3-furanyl) -3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride

T-3: pyromellitic dianhydride

T-4: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

Example 1

0.005 parts by weight of the imidized polymer B-1 obtained in Synthesis Example P-1 and polyamic acid A-9 (weight ratio 50:50) obtained in Synthesis Example P-9 and an organosilicon compound with respect to 100 parts by weight of the total amount of the polymer. Γ-butyrolactone / N-methyl-2-pyrrolidone / butyl cellosolve mixed with Tsu Silicone KF-6011 (brand name, Shin-Etsu Chemical Co., Ltd. make, PEG-11 methyl ether dimethicone) It melt | dissolved in the solution (weight ratio 40:30:30), and prepared two types of solution of 3.5 weight% and 5 weight% of solid content concentration. These solutions were filtered using the filter of 0.2 micrometer of pore diameters, respectively, and the liquid crystal aligning agent was produced in 2 types of concentration. In these, the viscosity of the liquid crystal aligning agent of 3.5 weight% of solid content concentration is shown in following Table 2.

Using these liquid crystal aligning agents, evaluation of printability, voltage retention, and baking was performed in accordance with the above-described method. The results are shown in Table 5 below.

Examples 2 to 36

Liquid crystal aligning agents 2 to 36 were prepared in the same manner as in Example 1 except that the kind and amount of the polymer and the organosilicon compound were as shown in Table 2, respectively, at two concentrations of 3.5% by weight and 5% by weight of solids. It was. The viscosity of the liquid crystal aligning agent of solid content concentration 3.5 weight% is shown in Table 2.

In addition, the evaluation result performed in accordance with the method mentioned above using these liquid crystal aligning agents is shown in Table 5.

In Table 2, the abbreviated-name of an organosilicon compound has the following meanings, respectively.

KF-6011: Product name "Shin-Etsu Silicone KF-6011", Shin-Etsu Chemical Co., Ltd. make, PEG-11 methyl ether dimethicone

KF-6012: Product name "Shin-Etsu Silicone KF-6012", Shin-Etsu Chemical Co., Ltd. make, PEG / PPG-20 / 22 butyl ether dimethicone

SH3773M: Brand name, Toray Dow Corning Silicone Co., Ltd. product, polyoxyethylene methyl polysiloxane copolymer

SH3749: Trade name, Toray Dow Corning Silicone Co., Ltd. product, poly (oxyethylene oxypropylene) methyl polysiloxane copolymer

Example 37

0.005 parts by weight of the imidized polymer B-1 obtained in Synthesis Example P-1 and polyamic acid A-9 (weight ratio 50:50) obtained in Synthesis Example P-9 and an organosilicon compound with respect to 100 parts by weight of the total amount of the polymer. 20 parts by weight of polyethylene glycol diglycidyl ether (molecular weight: about 400) based on 100 parts by weight of the total amount of the polymer as the silicone silicone KF-6011 and the epoxy compound, It melt | dissolved in the / butyl cellosolve mixed solution (weight ratio 40:30:30), and prepared two types of solutions of 3.5 weight% and 5 weight% of solid content concentration. These solutions were filtered using the filter of 0.2 micrometer of pore diameters, respectively, and the liquid crystal aligning agent was produced in 2 types of concentration. In these, the viscosity of the liquid crystal aligning agent of 3.5 weight% of solid content concentration is shown in following Table 3.

Moreover, the evaluation result performed by the method mentioned above using these liquid crystal aligning agents is shown in Table 5.

Examples 38-42

Except having made the kind of the organosilicon compound and epoxy compound to be used as Table 3, it carried out similarly to Example 37, and each liquid crystal aligning agent was produced in 2 types of density | concentrations, respectively. The viscosity of the liquid crystal aligning agent of solid content concentration 3.5 weight% is shown in Table 3.

Moreover, the evaluation result performed by the method mentioned above using these liquid crystal aligning agents is shown in Table 5.

In Table 3, the meaning of abbreviated-name of an organosilicon compound is the same as that of Table 2. The abbreviation of an epoxy compound is as follows.

Epoxy A: Polyethylene glycol diglycidyl ether (molecular weight about 400)

Epoxy B: 1,6-hexanediol diglycidyl ether

Epoxy C: N, N, N ', N'-tetraglycidyl-2,2'-dimethyl-4,4'-diaminobiphenyl

Epoxy D: N, N, N ', N'-tetraglycidyl-4,4'-diaminodiphenylmethane

Epoxy E: 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane

Epoxy F: N, N, N ', N'-tetraglycidyl-m-xylenediamine

Comparative Examples 1 to 8

Except not using an organosilicon compound, it carried out similarly to Example 1, 5, 9, 13, 17, 21, 25, and 29, and prepared each liquid crystal aligning agent in 2 types of concentrations, respectively. In these, the viscosity of the liquid crystal aligning agent of 3.5 weight% of solid content concentration is shown in following Table 4.

Table 5 shows the evaluation results performed in accordance with the above-described method using these liquid crystal aligning agents.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the pattern of the ITO electrode of the liquid crystal display element manufactured for evaluation of baking in an Example and a comparative example.

Claims (3)

Polymers obtained by the reaction of at least one selected from the group of tetracarboxylic dianhydrides represented by the following formulas (1) and (2) and at least one selected from the diamine groups represented by the following formulas (3) to (6) and / or An imidation polymer, the compound represented by following formula (7), and a solvent are contained, The liquid crystal aligning agent characterized by the above-mentioned. <Formula 1>

<Formula 2>

<Formula 3>

<Formula 4>

<Formula 5>

<Formula 6>

(Wherein R ¹ to R ⁴ are each independently a linear, branched or cyclic alkyl group having 1 to 40 carbon atoms or a linear, branched or cyclic alkenyl group having 4 to 40 carbon atoms, and among the hydrogen atoms which R ¹ to R ⁴ have 1 to 15 may be substituted with a fluorine atom, A ¹ and A ² are each independently a hydrogen atom or a methyl group) <Formula 7>

(Wherein X ¹ is a monovalent group represented by Formula 7a or 7b, m and n are integers from 1 to 20) <Formula 7a>

<Formula 7b>

(Wherein R ⁵ is each independently a methylene group or a polymethylene group, R ⁶ is an alkyl group, and a and b are each independently an integer from 1 to 20) The liquid crystal aligning agent according to claim 1, further comprising a compound having two or more epoxy groups in the molecule. The liquid crystal aligning film obtained from the liquid crystal aligning agent of Claim 1 or 2 is provided. The liquid crystal display element characterized by the above-mentioned.

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