Patent ID: 7541416

Claim:
A polycarbonate copolymer comprising 30 to 70 mol % of a structural unit represented by the general formula (1) and 70 to 30 mol % of a structural unit represented by the general formula (2); wherein R 1 and R 2 , each independently, are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a cycloalkyl group having 6 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms; X is an alkylene group having 2 to 6 carbon atoms, a cycloalkylene group having 6 to 10 carbon atoms or an arylene group having 6 to 10 carbon atoms, which may be branched and n and m, each independently, are an integer of 1 to 5; wherein R 3 is an alkyl group having 1 to 10 carbon atoms and p is an integer of 0 to 4 and plural R 3 may be attached to an optional position of the tetracyclodecane ring.