| 摘要 |
PROBLEM TO BE SOLVED: To provide an original plate for a lithographic printing plate by which printing can be performed by being directly fitted on a printing machine without performing any treatment at all after an exposure, and in addition, wherein the stain resistance and the plat wear resistance are increased, and stain is not generated on a non-image section even if an IPA free wetting water is used when the hydrophilic property of the non-image section is insufficient. SOLUTION: This original plate for a lithographic printing plate has an image forming layer containing a hydrophobic resin particle which has a nonionic hydrophilic group and an ionic hydrophilic group on the surface, a light-heat converting agent and a hydrophilic binder, on a supporting body. The hydrophobic resin particle preferably has a graft polymer chain having a nonionic hydrophilic group and an ionic hydrophilic group on the surface. Then, the hydrophobic resin particle is preferably obtained by crosslinking a polymer having a nonionic hydrophilic group, and a hydrophobic resin particle having an ionic hydrophilic group on the surface. |
