Patent ID: 9649791
Date: 2017-05-16
CPC Classifications: B29C,B29D,B29K,C08G,C08L,C09D

Claim:
1. A method of preparing an optical film, the method comprising: preparing a coating composition comprising an imide and amic acid-containing random copolymer represented by Chemical Formula 1, the coating composition further comprising at least one polymerization aid selected from an alkyl phosphite, an aryl phosphite, an alkyl phosphate, and an aryl phosphate; providing the coating composition on a substrate to form a coating layer; and applying heat to cure the coating layer into a cured film, wherein Chemical Formula 1 has the following structure: and wherein, in Chemical Formula 1, are the same or different in each repeating unit, and are each independently selected from at least one of an aromatic organic group, an aliphatic organic group, and an alicyclic organic group, and 0<x<1.