Patent ID: 9720136
Date: 2017-08-01
CPC Classifications: C08F,G02B

Claim:
1. A photo-alignment copolymer, comprising: a photo-alignment repeating unit of Chemical Formula 1; and a repeating unit of Chemical Formula 2 below: wherein A is each independently hydrogen or C L′ is a spacer group having a combination of at least one bivalent connecting group selected from the group consisting of a single bond, carbonyl, —C(═O)O—, —OC(═O)—, —O—, —S—, substituted or unsubstituted C W is a photo-reactive functional group of Chemical Formula 1a, wherein E is a single bond; —O—; substituted or unsubstituted C Y and Z are each independently hydrogen; or substituted or unsubstituted C R R wherein A is each independently hydrogen or C B and B′ are each independently carbonyl, —C(═O)O—, —OC(═O)—, —O— or —S—, L is a single bond, or substituted or unsubstituted C S R