| 摘要 |
PROBLEM TO BE SOLVED: To improve an image reproducibility while keeping an ink mileage favorable by providing a heat-sensitive layer containing a compound which can be decomposed by the action of a laser radiation, and a thermo-setting compound, and an ink repelling layer in order on a base sheet, and making the heat-sensitive layer contain an organic complex compound. SOLUTION: A heat-sensitive layer in this direct drawing type lithographic printing plate original plate wherein on a board, the heatsensitive layer and an ink repelling layer are provided in this order, is formed of a substance containing (a) a compound which can be decomposed by the action of a laser radiation, and (b) a thermo-setting compound. As the compound (a), ammonium nitrate, potassium nitrate, sodium nitrate, a carbonic ester compound or the like can be counted, and as the compound (b), a novolac resin and a resol resin, a phenol-furfural resin or the like can be counted. In addition, such a heat- sensitive layer is made to contain an organic complex compound such as an organic complex salt wherein an organic ligand is coordinated in a metal. As the ink repelling layer, a silicone rubber layer is used. |
