Light-sensitive diazo photopolymerizable composition with polyurethane having carbon-carbon unsaturated and a carboxyl group

摘要

A light-sensitive composition which contains a polyurethane resin having a carbon-carbon unsaturated bond and a carboxyl group. A presensitized plate using the above light-sensitive composition can be developed with an aqueous alkaline developing solution and provides a lithographic printing plate having excellent printing durability.