Patent ID: 6855475

Claim:
A photoresist composition comprising a polymer binder and a photoactive component, wherein the polymer binder comprises as polymerized units a monomer having an electronegative substituent and an ester group, wherein the monomer group comprises a leaving group bonded directly to the to the ester group, wherein the leaving group is selected from a) an optionally substituted noncyclic alkyl moiety having 6 or more carbon atoms, with at least 2 carbon atoms selected from secondary, tertiary and quaternary carbon atoms, and wherein the ester group is directly bonded to a quaternary carbon atom; b) optionally substituted fenchyl; c) optionally substituted phenyl; d) optionally substituted 3,2,0 bridged system; e) optionally substituted bridged heteroalicyclic group; f) optionally substituted cycloalkyl group having 3 or 4 ring carbon atoms; and g) optionally substituted 2,2,1-bridged systems.