Unsaturated group-containing urethane compound, photopolymerizable composition containing it, and photosensitive lithographic printing plate

摘要

An unsaturated group-containing urethane compound of the following formula (I): (I) wherein X is a C1-20 alkylene group which may be branched, and R1 is a group of the following structural formula (A) or (B): (A) (B) wherein each of R2 and R3 which are independent of each other, is a hydrogen atom or a methyl group, and Y is a C1-6 alkylene group which may be branched.