Patent ID: 9459494
Filing Date: 2016-10-04
CPC Classification: C08G,C09K,G02F

Claim Text:
1. A liquid crystal display device having a liquid crystal alignment film, wherein the liquid crystal alignment film is obtained by subjecting a liquid crystal alignment agent to a rubbing treatment, wherein the liquid crystal alignment agent comprises a polyimide precursor consisting of atoms of carbon, nitrogen, oxygen and hydrogen and having a structural unit represented by the formula (1) and having a volume resistivity of from 1×10 wherein formula (1), R represents a hydrogen atom or an alkyl group, X represents a tetravalent organic group, and A represents a bivalent organic group, wherein from 10 to 100 mol % of A in formula (1) is a bivalent organic group having the following structure (6): wherein formula (6), p is 1, wherein formulae (2-1) and (2-2), R represents a hydrogen atom or an alkyl group, Y represents a tetravalent organic group, B represents a bivalent organic group, and from 10 to 100 mol % of B is a bivalent organic group having any one of the following structures (3) to (5) in its structure, or a paraphenylene group: wherein formula (3), m 1 is an integer of from 2 to 18, wherein formula (4), one or a plurality of optional hydrogen atoms on the benzene rings may be substituted by a monovalent organic group other than a primary amino group, and m 2 is an integer of from 1 to 8, wherein formula (5), one or a plurality of optional hydrogen atoms on the benzene rings may be substituted by a monovalent organic group other than a primary amino group, and m 3 is an integer of from 1 to 4.