DICYOLHEXYL-3,4,3',4'-TETRACARBOXYLIC ACID OR PIANHYDRIDE OBTAINED THEREFROM

摘要

A polyimide obtained from a polyamide-acid or polyamide-acid ester prepared by reacting dicyclohexyl-3,4,3 min ,4 min -tetracarboxylic acid or dianhydride with a diamine is excellent in transparency, heat resistance and mechanical properties, said polyimide being able to be obtained at a lower temperature, and particularly suitable for an orientation film used in liquid crystal display device.