Patent ID: 6103322
Filing Date: 2000-08-15
Classification: C08G,C09K,G02F,Y10T

Abstract:
A polyamic acid for inducing alignment of a liquid crystal medium adjacent to a surface of an optical alignment layer comprising a polyamic acid of structure I ##STR26## wherein R.sub.1 is selected from the group of C.sub.3 -C.sub.20 linear or branched hydrocarbon chain containing 1 to 4 carbon-carbon double bonds; X is a divalent moiety selected from the group --O--, --S--, and --NR--, wherein R is selected from H, R.sub.1, and C.sub.1 -C.sub.4 hydrocarbon chain; X.sub.1 is independently selected from the group H, Cl, F, and Br; m is 1 or 0; Z is selected from the group --S--, --O--. --SO.sub.2 --, --CH.sub.2 --, --C(CF.sub.3).sub.2 --, --C(O)--. --CH.sub.2 CH.sub.2 --, --NR.sub.2 -- and a covalent bond wherein R.sub.2 is selected from H and C.sub.1 -C.sub.4 hydrocarbon chain; and the carboxylic acid groups are ortho to the amide linkages.