| CPC C08L 79/08 (2013.01) [C08G 73/1039 (2013.01); C08G 73/1067 (2013.01); C08G 73/1078 (2013.01); C08G 73/14 (2013.01); C08L 2201/10 (2013.01); C08L 2203/16 (2013.01); C08L 2203/206 (2013.01)] | 12 Claims |
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1. A polyimide-based film having different surface energies from each other on both surfaces, wherein when a surface energy of a first surface having a relatively low surface energy is A, and a surface energy of a second surface having a relatively high surface energy is B, the following equation is satisfied:
B/A≥1.3. [Equation 1]
wherein the polyimide-based film comprises a polyamideimide-based resin that is a copolymer, the copolymer comprising:
a unit consisting of an amine-terminal polyamide oligomer derived from a first fluorine-based diamine and an aromatic diacid dichloride;
a unit derived from a second fluorine-based aromatic diamine;
a unit derived from an aromatic dianhydride; and
a unit derived from a cycloaliphatic dianhydride,
wherein a content of the unit consisting of an amine-terminal polyamide oligomer is 50% or more, based on mass; and
wherein the polyimide-based film has a modulus in accordance with ASTM D882 of 3 GPa or more, an elongation at break of 8% or more, a light transmittance of 5% or more as measured at 388 nm in accordance with ASTM D1746, a total light transmittance of 87% or more as measured at 400 to 700nm, a haze of 2.0% or less, a yellow index of 5.0 or less, and a b* value of 2.0 or less.
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