Patent ID: 7662537
Filing Date: 2010-02-16
Classification: B41C,G03F

Abstract:
1. A lithographic printing original plate having a photosensitive layer formed on a support, wherein the photosensitive layer comprises the heat cured product of a photosensitive resin composition, wherein the photosensitive layer has a phase-separation structure in a sea-island form, wherein the photosensitive resin composition comprises a hydrophilic resin having cross-linking groups that can react with a cross-linking agent, a hydrophilic resin having no functional groups that can react with a cross-linking agent and which can dissolve out in water, a melamine resin, organic fine particles and a photothermal conversion material, wherein the hydrophilic resin having cross-linking groups that can react with a cross-linking agent is obtained by polymerizing a monomer containing a cross-linking monomer having a hydroxyl group, wherein an island portion in the sea-island form comprises the hydrophilic resin having no functional group and has a mean diameter value of from 0.5 μm to 10 μm, and wherein the hydrophilic resin having no functional groups that can react with a cross-linking agent is obtained by polymerizing at least one monomer containing a N-alkyl or N-alkylene substituted (meth)acrylamide compound selected from the group consisting of monomers represented by formulae (1) and (2), formula 1 formula 2