Patent ID: 8053041

Claim:
An overcoat film composition, comprising approximately 5 to approximately 30 wt % a polyester-polyamic acid (A1); wherein said polyester-polyamic acid (A1) is obtained by reacting 1,4-butanediol, 3,3′-diaminodiphenylsulfone, and 3,3′,4,4′-diphenyl ether tetracarboxylic dianhydride, approximately 0.2 to approximately 10 wt % a polyamic acid (B); wherein said polyamic acid (B) is obtained by reacting 4,4′-diaminodiphenyl ether, pyromellitic dianhydride, and 1,2,3,4-cyclobutanetetracarboxylic dianhydride; approximately 5 to approximately 30 wt % a polyester-polyimide (A2); wherein (A2) has structural units expressed by Formulas (3) and (2): wherein R 1 , R 2 , and R 3 are each independently a C 2 to C 100 organic group; and one or more epoxy resins (C) selected from the group consisting of compounds expressed by Formulas (220) to (223): wherein n is an integer from approximately 0 to approximately 10.