| abstract |
[57] [Summary] [Problem] To be used for a photosensitive layer or the like of a photosensitive lithographic printing plate, the infrared sensitivity is excellent in processability (development latitude) and printing durability in a fatigue developer with reduced activity. A composition is provided. The content of (A) a copolymer having a monomer unit represented by the following general formula (1), (B) a novolak resin and (C) a cyanine dye, and (B) a novolak resin content Is 50% by weight or more in the total solid content. [Chemical 1] [Wherein, X represents a divalent linking group, Y represents hydrogen or a carboxyl group, Z represents hydrogen, an alkyl group or a carboxyl group, m represents 0 or 1; ] |