LIQUID CRYSTAL ALIGNMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT

WIPO Patent Application WO/2022/234820

A1

Provided is a liquid crystal alignment agent whereby a liquid crystal display element having a low incidence of display defects (line burn-in) is obtained even when negative-type liquid crystal is used as the liquid crystal material.　The present invention provides a liquid crystal alignment agent containing a polymer (A), a polymer (B), and a crosslinkable compound (C).　Polymer (A): A polyimide obtained by imidization of a polyimide precursor that is a product of reaction of a tetracarboxylic acid derivative component and a diamine compound containing a diamine represented by formula (d0) and a diamine represented by formula (dD).　Polymer (B): A polyimide precursor that is a product of reaction of a tetracarboxylic derivative component and a diamine component constituted from a diamine (dD'B) represented by "H-N(R)-YD'-N(R)-H" (YD' representing a divalent organic group having "-N(D')-" in the molecule thereof (where D' represents a protecting group dissociated by heating and replaced with a hydrogen atom), and R being synonymous with R in formula (dD)) and a diamine represented by formula (dB) (excluding the diamine (dD'B). However, the diamine precursor does not have an imide ring structure.　Crosslinkable compound (C): An epoxy-based compound represented by formula (En). (In formula (d0): the two Ar atoms each independently represent a divalent benzene ring, a biphenyl structure, or a naphthalene ring, and any hydrogen atom on the ring may be substituted with a univalent group; and Lo represents -O-(-Ar'-O-)n- (where n is an integer of 0 to 3, Ar' represents a divalent benzene ring or a biphenyl structure, and any hydrogen atom on the ring may be substituted with a univalent group), -(CH2)n- (where n is an integer of 2 to 18), or a group in which at least a portion of the -CH2- groups of the –(CH2)n- are substituted with any of -O-, -C(=O)-, or -O-C(=O)-. In formula (dD), YD represents a divalent organic group having the group "-N(D)-" in the molecule thereof (where D represents a protecting group dissociated by heating and replaced with a hydrogen atom). In formulae (d0) and (dD), the plurality of R each independently represent a hydrogen atom or a univalent organic group.) (YB represents a divalent organic group that satisfies conditions (1) and (2), and R is synonymous with R in formula (d0.)　Condition (1): Not having a nitrogen-atom-containing structure selected from the group consisting of heterocycles including a nitrogen atom and secondary or higher amino groups (excluding amino groups derived from the group "-N(D')-" (where D' represents a protecting group dissociated by heating and replaced with a hydrogen atom)).　Condition (2): Not having a C6 or higher side-chain group in the molecule thereof. (In formula (En), a is an integer of 2 to 4, Ra is an a-valent organic group, and a bonding sites with N are aliphatic carbon atoms.)

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NAKAHARA SHOICHIRO (JP)
NIITSU SHINPEI (JP)
NAKAI TAKASHI (JP)
TAMAI YUKI (JP)

PCT/JP2022/019330

November 10, 2022

April 28, 2022

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NISSAN CHEMICAL CORP (JP)

G02F1/1337; C08G73/10

WO2019065646A1	2019-04-04
WO2020175561A1	2020-09-03
WO2020158818A1	2020-08-06

T.S. PARTNERS et al. (JP)

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