LIQUID CRYSTAL ALIGNING AGENT AND LIQUID CRYSTAL DISPLAY ELEMENT USING SAME

摘要

A liquid crystal aligning agent which is characterized by comprising a copolymer produced by reacting a diamine component with tetracarboxylic dianhydride, wherein the diamine component comprises a diamine compound (A) represented by formula [1], a diamine compound (B) represented by formula [2] and a diamine compound (C) having a carboxyl group in the molecule. [In formula [1], p represents an integer of 0 or 1; X1 represents a phenylene; X2 represents a phenylene or a cyclohexylene; X3 represents a cyclohexylene; and X4 represents an alkyl group having 3 to 12 carbon atoms, a fluoroalkyl group having 3 to 12 carbon atoms, an alkoxy group having 3 to 12 carbon atoms, or a fluoroalkoxy group having 3 to 12 carbon atoms.  In formula [2], Y1 represents -O-, -NH-, -N(CH3)-, -CONH-, -NHCO-, -CH2O-, -OCO-, -CON(CH3)- or -N(CH3)CO-; Y2 represents a single bond, an aliphatic hydrocarbon group having 1 to 20 carbon atoms, a non-aromatic cyclic hydrocarbon group, or an aromatic hydrocarbon group; Y3 represents a single bond, -O-, -NH-, -N(CH3)-, -CONH-, -NHCO-, -COO-, -OCO-, -CON(CH3)-, -N(CH3)CO- or -O(CH2)m- (wherein m represents an integer of 1 to 5); Y4 represents a nitrogenated aromatic heterocyclic ring; and n represents an integer of 1 to 4.]