LIQUID CRYSTAL ALIGNMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT HAVING THE SAME

摘要

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. The liquid crystal alignment agent includes a polymer composition (A) synthesized by tetracarboxylic dianhydride compound (a) and diamine compound (b), and a solvent (B). The diamine compound (b) includes diamine (b-1) shown as following formula (I) and diamine (b-2):;in formula (I), R1 represents a linear or branched alkyl of 1 to 6 carbons, a linear or branched hydroxyl alkyl of 1 to 6 carbons, an alkoxy of 1 to 6 carbons, an alkylthio of 1 to 6 carbons, a halogen atom, an amino group or a nitro group; R2 represents a methylene group, a divalent alkyl of 2 to 10 carbons, a divalent alkenyl of 2 to 7 carbons or a divalent alkynyl of 2 to 6 carbons; and a represents an integer of 0 to 3.

主权项

1. A liquid crystal alignment agent, comprising:
a polymer composition (A), obtained by a mixture, and the mixture includes a tetracarboxylic dianhydride compound (a) and a diamine compound (b); and a solvent (B), wherein the diamine compound (b) includes at least one diamine (b-1) having a structure of formula (I) and at least one diamine (b-2) having a structure of formula (II): in the formula (I), R1 respectively represents a linear or branched alkyl group of 1 to 6 carbons, a linear or branched hydroxyl alkyl group of 1 to 6 carbons, an alkoxy group of 1 to 6 carbons, an alkylthio group of 1 to 6 carbons, a halogen atom, an amino group or a nitro group; R2 represents a methylene group, a divalent alkyl group of 2 to 10 carbons, a divalent alkenyl group of 2 to 7 carbons or a divalent alkynyl group of 2 to 6 carbons; and a represents an integer of 0 to 3; in the formula (II), R3 and R4 respectively represent an alkyl group of 1 to 6 carbons, an alkoxy group of 1 to 6 carbons, a halogen atom and a cyano group; b and d respectively represent an integer of 0 to 4; e represents 0 or 1; and * respectively represent a bonding position.