Patent ID: 8435609
Filing Date: 2013-05-07
Classification: C09K,G02F

Abstract:
1. A liquid crystal alignment agent, comprising: a polymer (A) obtained from a reaction between tetracarboxylic dianhydride compound and diamine compound; an epoxy compound (B); and an organic solvent (C); wherein the epoxy compound (B) includes epoxy compound (B-1) having multi-ring aliphatic structures and the liquid crystal alignment agent is coated on a glass substrate, and heated for 15 minutes at 220° C. to form a hard coating film, the hard coating film is extracted for 72 hours by using acetone at 60° C. to obtain an extract, an epoxy value on the extract is designated O, and based on 100 parts by weight of the solid content of the liquid crystal alignment agent, the parts by weight of the epoxy compound (B) is designated W, the O and W conform to the following equation: wherein the epoxy compound (B-1) is selected from the group consisting of dicyclopentadiene diepoxide, tricyclopentadiene diepoxide, tetracyclopentadiene diepoxide, and pentacyclopentadiene diepoxide.