| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing solution for a photosensitive planographic printing plate capable of satisfying both stains in printing and printing resistance and capable of ensuring satisfactory developing performance even under a low pH condition and to provide a method for making a planographic printing plate. SOLUTION: The developing solution for a photosensitive planographic printing plate contains a nonionic surfactant and/or an anionic surfactant, a weak acid or its salt having a dissociation constant pKa of 10-13 and a water-soluble sulfite and/or an alkali-soluble mercapto compound and/or a thio-ether compound and has pH 11.5-12.8. A photosensitive planographic printing plate obtained by disposing a photopolymerizable photosensitive layer comprising a compound having an ethylenically unsaturated bond and a titanocene initiator is exposed, washed, processed with the developing solution, washed again and coated with >=0.02 g/m<2> (on dry weight basis) desensitizing agent comprising (a) 0-3 mass% gum arabic and (b) 5-30 mass% modified starch. |
