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

摘要

Disclosed is a liquid-crystal alignment agent, which is used in a liquid-crystal display element obtained by means of a method that-by means of a polymer obtained from using a liquid crystal material that mixes, with a liquid crystal, a polymerizable compound polymerized by heat or ultraviolet irradiation, and polymerizing the aforementioned polymerizable compound while applying voltage to the liquid crystal layer-controls the alignment orientation of a liquid crystal during driving, and which contains at least one polymer from among a polyimide and a polyimide precursor having a side chain represented by the belowmentioned formula (1). (In formula 1: X1 is a divalent organic group selected from a single bond, -(CH2)a- (a being an integer from 1 to 10), -O-, -NH-, -N(CH3)-, -CONH-, -NHCO-, -CH2O-, -COO-, -OCO-, -CON(CH3)-, or -N(CH3)CO-; X2 is a divalent organic group selected from a single bond or -(CH2)b- (b being an integer from 1 to 10); X3 is a divalent organic group selected from a single bond, -(CH2)c- (c being an integer from 1 to 10), -O-, -NH-, -N(CH3)-, -CONH-, -NHCO-, -CH2O-, -COO-, -OCO-, -CON(CH­­3)-, or N(CH3)CO-; X­4 indicates a divalent cyclic group selected from a benzene ring, a cyclohexyl ring, or a heterocycle, or indicates a divalent organic group having a carbon number of 12-25 and having a steroid skeleton, and any given hydrogen atom on the aforementioned cyclic groups may be replaced with a group selected from an alkyl group having a carbon number of 1-3, an alkoxyl group having a carbon number of 1-3, a fluorine-containing alkyl group having a carbon number of 1-3, a fluorine-containing alkoxyl group having a carbon number of 1-3, or a fluorine atom; X5 indicates a divalent cyclic group selected from a benzene ring, a cyclohexyl ring or a heterocycle, any given hydrogen atom on these cyclic groups may be replaced by a group selected from an alkyl group having a carbon number of 1-3, an alkoxyl group having a carbon number of 1-3, a fluorine-containing alkyl group having a carbon number of 1-3, a fluorine-containing alkoxyl group having a carbon number of 1-3, or a fluorine atom, and n is an integer from 0 to 4; and X6 is an alkyl group having a carbon number of 1-18, a fluorine-containing alkyl group having a carbon number of 1-18, an alkoxyl group having a carbon number of 1-18, a fluorine-containing alkoxyl group having a carbon number of 1-18, or a hydrogen atom.)