Patent ID: 7935776

Claim:
A curable and developable polyurethanes, which is characterized by having a carboxy group in its main chain and a (meth)acryloyl group in its side chain and comprising the following repeat units (I), (II), and (II) in a random arrangement wherein: R 1 represents a C 1-12 straight or branched alkylene group, a C 3-8 cyclic alkylene group, a phenylene group, a biphenylene group, a naphthalene group, a xylenenyl group, a divalent toludine group, a group of -Ph-A-Ph- (wherein A represents CH 2 , —NH—, or —O—), these groups are each optionally substituted by a C 1-6 alkyl group; R 2 represents a divalent aliphatic group which optionally has one or more OH substituents, wherein the OH substituents are optionally further reacted with a diisocyanate group; R 3 represents a C 1-6 straight or branched alkyl group which optionally has one or more OH substituents, wherein the OH substituents are optionally further reacted with a diisocyanate group; B represents the groups represented by formula (IV): in which R 4 represents H or CH 3 ; and T represents one or more substituents selected from the group consisting of the following formulae: the polyurethane has a weight molecular weight measured by GPC in a range of from 3,000 to 400,000; an acid value in a range of from 5 to 120 mgKOH/g.