Patent ID: 8218937

Claim:
An optical film comprising a polymer having 5% by mol or more of a repeating unit represented by the following general formula (I): wherein, A, A′, B and B′ each denote a substituent, a and a′ denote substitution number (an integer of 0 to 4) of the corresponding A and A′, b and b′ denote substitution number (an integer of 0 to 3) of the corresponding B and B′, A, A′, B and B′ each independently denote halogen or an alkyl group with a carbon number of 1 to 4, and R 1 and R 2 each independently denote hydrogen, halogen, an alkyl group with a carbon number of 1 to 10, a substituted or unsubstituted vinyl group, a substituted or unsubstituted ethynyl group, SiR 3 R 4 R 5 (R 3 to R 5 are each an alkyl group with a carbon number of 1 to 6 or an aryl group), or CR 6 R 7 (OH) (R 6 and R 7 are each an alkyl group with a carbon number of 1 to 4).