Polyamideimide film and window cover film including the same
AssigneesSK Innovation Co., Ltd., SK ie technology Co., Ltd.
InventorsJin Hyung Park, Sang Yoon Park, Hyeon Jeong Kim, Hye Ri Kim
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Abstract
Provided is a polyamideimide film and a window cover film including the same. More particularly, a polyamideimide film which may provide physical properties satisfying both modulus and retardation in a thickness direction which are in a trade-off relationship with each other, and thus, has a less screen distortion phenomenon when it is applied to a window cover film and excellent optical properties, and a window cover film including the same are provided.
Claims9
A polyamideimide film comprising a unit derived from an aromatic diamine, an aromatic dianhydride, and an aromatic diacid dichloride, wherein
- the aromatic diamine comprises 2,2′-bis(trifluoromethyl)-benzidine (TFMB),
- the aromatic dianhydride comprises 9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride (BPAF), and
- the aromatic diacid dichloride comprises terephthaloyl dichloride (TPC),
- wherein a content of the terephthaloyl dichloride (TPC) is 50 mol or more with respect to 100 mol of the aromatic diamine,
- a content of the terephthaloyl dichloride (TPC) and the 9,9-bis(3,4-dicarboxyphenyl/fluorene dianhydride (BPAF) is 70 mol or more with respect to 100 mol of the diamine, and
- the polyamideimide film has a modulus of 5 GPa or more and a retardation in a thickness direction (Rth) of 5000 nm or less as measured at 550 nm.
Dependencies are inferred from the claim text.