| 摘要 |
PURPOSE:To obtain a photosensitive planographic printing plate having high liposensitive and sensitivity by incorporating a specified polymer compd. and a diazo resin into a photosensitive layer. CONSTITUTION:A polymer compd. and a diazo resin expressed by formulae (I)-(IV) (wherein R<1>, R<2>, R<3>, R<3+a> are hydrogen atoms, alkyl groups, or aryl groups, and A or B represents an end group) are incorporated into a photosensitive layer on a supporting body. This polymer compd. acts as a sensitization agent. The amt. of these compds. in the photosensitive layer is 0.5-30wt.%. As for the diazo resin to be used as a photosensitive material, it is preferable to use condensation copolymer diazo resins consisting of aromatic diazonium compd. and aromatic compd. having carboxyl groups or hydroxyl groups as the structural units. By this constitution, a photosensitive planographic printing plate having good ink depositing property is obtd. without decreasing the sensitivity. |
