| abstract |
An optical film having a high modulus of elasticity and a low coefficient of expansion at humidity is provided. Formula (1): a structural unit represented by [in Formula (1), Ar 1 represents a divalent aromatic group having a fluoroalkyl group having 1 to 12 carbon atoms, X represents a divalent organic group]; 2): Contains a polyamideimide-based resin having a weight average molecular weight of 200,000 to 1,000,000 having at least a structural unit represented by [in formula (2), X represents a divalent organic group and Y represents a tetravalent organic group] optical film. |