| CPC G06F 1/1652 (2013.01) [B32B 27/281 (2013.01); C08G 73/14 (2013.01); G02B 1/04 (2013.01); G02B 1/14 (2015.01); B32B 2307/51 (2013.01); B32B 2457/206 (2013.01); B32B 2457/208 (2013.01); C09K 2323/03 (2020.08)] | 12 Claims |
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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.
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