Patent ID: 6063829
Filing Date: 2000-05-16
Classification: C09K,G02F

Abstract:
A treating method for liquid crystal alignment, comprising:applying polarized ultraviolet or electron rays to a polymer thin film formed on a substrate, in a predetermined direction relative to the substrate surface, and using the substrate to align liquid crystal without rubbing treatment, wherein the polymer thin film is a polyimide resin containing a repeating unit of the formula (I): ##STR6## wherein R.sup.1 is a member selected from the group consisting of: ##STR7## wherein each of R.sup.3, R.sup.4, R.sup.5 and R.sup.6 is, independently, hydrogen or a C.sub.1-4 organic group, R.sup.7 is hydrogen, fluorine or a C.sub.1-2 organic group, and R.sup.8 is hydrogen, fluorine or a C.sub.1-4 organic group; andR.sup.2 is a bivalent organic group;wherein the polyimide resin is obtained by dehydration ring-closure of a polyimide precursor having a reduced viscosity of from 0.05 to 3.0 dl/g as measured in N-methyl-2-pyrrolidone at a temperature of 30.degree. C. at a concentration of 0.5 g/dl.