Patent ID: 6316574
Filing Date: 2001-11-13
Classification: C08G,C08L,C09K,G02F,Y10T

Abstract:
A polyamic acid composition comprising a polyamic acid A providing a polyimide providing a polyimide, and a polyamic acid B containing a diamine having side chains, wherein said polyamic acid A is a polyamic acid comprising an acid component containing at least one tetracarboxylic dianhydride selected from a group consisting of aliphatic tetracarboxylic dianhydrides and alicyclic tetracarboxylic dianhydrides, and an amine component based on at least one of aromatic diamine represented by the following formula (1); ##STR27##wherein, each Y.sub.1 is independently an oxygen atom or a CH.sub.2 group; each X.sub.1 is independently a single bond, an oxygen atom, C(CH.sub.3).sub.2, C(CF.sub.3).sub.2, S, SO.sub.2, or a linear alkyl group having 1 to 6 carbon atoms; and n.sub.1 is an integer from 0 to 2, and said polyamic acid B is a polyamic acid comprising an acid component containing 50 mole % or more of at least one aromatic tetracarboxylic dianhydride, and an amine component containing at least one diamine having a group enabling the pre-tilt angle of a liquid crystal to be increased on the side chain thereof, the ratio A/B of the polyamic acid A to the polyamic acid B being 50/50 to 95/5 (by weight).