Patent ID: 8216770

Claim:
A resin composition comprising a cardo resin with a structural unit represented by Formula 1: wherein: each R 1 and R 2 is independently a hydrogen atom, a halogen atom or a C 1 -C 5 alkyl group, R 3 is a vinyl, acryl or methacryl group, Z represents the residue of an acid anhydride or dianhydride, X is —CO—, —SO 2 —, —C(CF 3 ) 2 —, —Si(CH 3 ) 2 —, —CH 2 —, —C(CH 3 ) 2 —, —O—, (wherein R 4 is hydrogen, ethyl, —C 2 H 4 Cl, —C 2 H 4 OH, —CH 2 CH═CH 2 or phenyl), and k is integer from 1 to 40.