Patent ID: 7374862

Claim:
A photosensitive resin composition comprising: urethane resin soluble in aqueous alkali solution, said urethane resin obtained by first reacting a diisocyanate compound, a first diol compound having an ethylenically unsaturated group, a second diol compound having a carboxyl group, and a third diol compound not having any ethylenically unsaturated group or carboxyl group as an optional component without any catalyst; and then reacting the alcoholic hydroxy group of the reaction product of the first reaction with a cyclic acid anhydride selected from (a) a dibasic acid monoanhydride in which the dibasic acid forms an intramolecular acid anhydride, (b) a tribasic acid monoanhydride in which two carboxylic groups of the tribasic acid form an intramolecular anhydride, or a mixture of (a) and (b); a photo polymerization initiator; and a reactive cross-linking agent.