| abstract |
The present invention provides an optical film with high elastic modulus and low humidity expansion rate. The optical film of the present invention includes the following polyimide-based resin, which has at least a structural unit represented by formula (1): [In formula (1), Ar 1 represents a divalent aromatic group having a fluoroalkyl group having 1 to 12 carbon atoms, and X represents a divalent organic group], and the structural unit represented by formula (2): [In formula (2), X represents a divalent organic group and Y represents a tetravalent organic group], and the weight average molecular weight is 200,000 to 1,000,000. |