Patent ID: 11921546
Assignee: SK INNOVATION CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G  B | IPC B  C  G

Claim 0:
1. A polyimide-based film of which a modulus measured according to ASTM D882 is 5 GPa or more and a rate of change of the modulus, after the polyimide-based film is maintained under a high-temperature and high-humidity condition of 60° C. and 90% RH for 500 hours, is 10% or less,
wherein the polyimide-based film has an elongation at break of 8% or more when measured according to ASTM D882, a light transmittance of 5% or more when measured at 388 nm according to ASTM D1746, a total light transmittance of 87% or more when measured at 400 to 700 nm according to ASTM D1746, a haze of 2.0% or less, a yellow index of 5.0 or less, and a b* value of 2.0 or less, and
wherein the polyimide-based film is formed from a polyamide-imide-based resin prepared by polymerizing an amine-terminated polyamide oligomer derived from a first fluorine-based aromatic diamine and an aromatic diacid dichloride, with a second fluorine-based aromatic diamine, an aromatic dianhydride, and an alicyclic dianhydride.