Photosensitive compositions containing hydrogenated 1,2-polybutadiene

A photosensitive composition comprising:

• (I) 100 parts by weight of one prepolymer having terminal ethylenically unsaturated groups and a number average molecular weight of about 2,000 to 30,000 whose main segment is selected from the group consisting of (i) a chain consisting essentially of a hydrogenated 1,2-polybutadiene having two ends per molecule and a hydrogenation ratio of pendent vinyl groups of the 1,2-addition units of about 50 to 100 percent, about 1.2 to 2 of such ends per molecule carrying hydroxy groups, (ii) a residue consisting essentially of a chain extended hydrogenated 1,2-polybutadiene having 2 to 20 urethane bonds obtained by reaction between the hydrogenated 1,2-polybutadiene and a diisocyanate, (iii) a chain consisting essentially of a hydrogenated 1,2-polybutadiene having two ends per molecule and carboxyl groups at such ends introduced by esterification between the hydroxy groups of the hydrogenated 1,2-polybutadiene and the carboxyl groups of a dicarboxylic acid and (iv) a chain consisting essentially of a chain extended hydrogenated 1,2-polybutadiene having two ends per molecule and carboxyl groups at such ends introduced by esterification between the hydroxy groups of a chain extended hydrogenated 1,2-polybutadiene having hydroxy groups at such ends and 2 to 20 urethane bonds having been prepared by reaction between the hydrogenated 1,2-polybutadiene and the diisocyanate, and the carboxyl groups of a dicarboxylic acid,
• (II) about 5 to 100 parts by weight of at least one polymerizable ethylenically unsaturated monomeric compound,
• (III) a photopolymerization initiator in an amount of about 0.001 to 10 weight percent of the total weight of the prepolymer (I) and the polymerizable ethylenically unsaturated monomeric compound (II), and
• (IV) a stabilizer in an amount of about 0.001 to 2.0 weight percent of the total weight of the prepolymer (I) and the polymerizable ethylenically unsaturated monomeric compound (II).