Patent ID: 7189491

Claim:
A photoresist composition comprising a photoacid generator and a polymer comprising at least one unit derived from a cyclo olefin monomer and, at least one unit as described by structure 1, where, A has the structure where R 1 ′, R 1 ″ and R 1 ′″ are independently hydrogen, (C 1 –C 6 ) alkyl or cyano, and Y is X, C(O)OX, OX, where X is an aliphatic (C 1 –C 6 ) alkylene group, and m is 0 or 1, W is a (C 1 –C 8 ) linear or branched alkylene group, R is independently selected from substituted hydrocarbyl group, unsubstituted hydrocarbyl group, hydrogen, hydroxyl, and (C 1 –C 10 )alkyl, R′ is hydrogen or (C 1 –C 6 ) alkyl, and n=1–9.