| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a direct drawing type water-less lithographic printing plate of a favorable image reproducibility without requiring a complicated process after the radiation of laser beam by a method wherein an optothermal converting substance and a metal chelating compound are contained in a heat- sensitive layer which is provided on a base material of the printing plate. SOLUTION: For this direct drawing type printing plate original plate wherein an image formation from a recording head is directly performed on the printing plate without negative and positive films at the time of exposure, an image is formed by the radiation of laser beam, and for this reason, an optothermal converting substance is contained in a heat-sensitive layer which is provided on a base material. The optothermal converting substance is not especially limited as long as being a substance which absorbs laser beam, and black pigment such as carbon black, aniline black, and phthalocyanine or naphthalocyanine based green pigment or the like can be used. Also, in the heat-sensitive layer, a metal chelating compound such as metal diketonate, metal alkoxide, and an alkyl metal is contained, and at the same time, an active hydrogen group-containing compound is contained when necessary. |
