Patent ID: 11912827
Assignee: DAXIN MATERIALS CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 0:
1. A poly(imide-ester-amide) copolymer, comprising imide bonds from 2,2′-bis(trifluoromethyl)benzidine (TFMB) and at least one of 1,2,3,4-cyclobutane tetracarboxylic dianhydride (CBDA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) or 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), ester bonds from one of hydroquinone bis(trimellitate anhydride) (TAHQ) or 1,4-cyclohexylene bis(trimellitate anhydride) (TACH), and amide bonds from 2,2′-bis(trifluoromethyl)benzidine (TFMB) and at least one of terephthaloyl chloride (TPC) or isophthaloyl dichloride (IPC), and one of (3-aminopropyl)triethoxysilane (APTES) or 3-isocyanatopropyltriethoxysilane (Alink25), and a molar ratio of the imide bonds, the ester bonds, and the amide bonds is 56 to 65:19 to 23:12 to 24,
wherein the imide bonds, the ester bonds, and the amide bonds are randomly arranged in a main chain of the poly(imide-ester-amide) copolymer, and
an optical film prepared from the poly(imide-ester-amide) copolymer after a baking process at 200° C. to 300° C. for 20 minutes to 1 hour and having a thickness of 80 μm has a bend recovery angle of greater than 85 degrees, a haze of less than 1%, a pencil hardness of greater than 3B, a transmittance of greater than 85% and a yellowness index of 5 or less.