Patent ID: 7524541
Filing Date: 2009-04-28
Classification: C09K,G02F,Y10T

Abstract:
1. A liquid crystal aligning agent comprising at least one selected from the group consisting of a polyamic acid obtained by reactive polymerization of a tetracarboxylic dianhydride component with a diamine component, and a polyimide obtained by cyclodehydration of the polyamic acid; wherein from 20 to 100 mol % of the tetracarboxylic dianhydride component is at least one tetracarboxylic dianhydride selected from the group consisting of 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 2,3,5-tricarboxycyclopentylacetic dianhydride, 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalenesuccinic dianhydride, bicyclo[3 3,0]octane-2,4,6,8-tetracarboxylic dianhydride and 1,2,3,4-butanetetracarboxylic dianhydride; wherein from 10 to 100 mol % of the diamine component is a diamine represented by the following formula (1): wherein two among R 1 to R 10 are primary amino groups, and the rest are hydrogen atoms or monovalent organic groups other than primary amino groups, provided that they may be the same or different from one another.