Patent ID: 7247659

Claim:
A photosensitive composition comprising, (A) a polymer containing at least one carboxylic acid group in the molecule and having a molecular weight of 200′000 or less which polymer is an addition product of a carboxyl group-containing resin and an unsaturated compound having an α,β-unsaturated double bond and an epoxy group, wherein the carboxyl group-containing resin is selected from the group consisting of copolymers comprising as monomers one or more ethylenically unsaturated carboxylic acid compounds and one or more ethylenically unsaturated compounds selected from the group consisting of esters of methacrylic, acrylic, maleic and fumaric acid; (B) at least one photoinitiator compound of formula I wherein R 1 is linear or branched C 1 –C 12 alkyl; R 2 is linear or branched C 1 –C 4 alkyl; R 3 and R 4 independently of one another are linear or branched C 1 –C 8 alkyl; and (C) an ester of a polyol, wherein the polyol is partially or fully esterified with an ethylenically unsaturated carboxylic acid.