| 摘要 |
PURPOSE:To provide a photosensitive compsn., photosensitive planographic printing plate and its processing method by which production of sludge is prevented, contamination of the base is prevented, concentrating property of the developer used can be increased, and sensitivity of a photosensitive layer can be increased. CONSTITUTION:This photosensitive compsn. contains (1) an alkalisoluble resin, (2) o-quinone diazide compd. or diazo compd., and (3) chelating agent. The photosensitive planographic printing plate has a layer of this photosensitive compsn. on a supporting body. In the processing method of this photosensitive planographic printing plate, the plate is exposed for an image and then developed with a developer comprising an alkali soln. containing water as the main solvent or a common developer for both of negative and positive photosensitive planographic printing plates. This developer consists of an alkali metal silicate soln. containing water as the main solvent. |
