| 摘要 |
PURPOSE:To produce the printing plate highly resistant to scratching and printing, excellent in picture reproducibility and wherein the two layers of an ink repelling layer at the part to be exposed are firmly adhered to each other by the photochemical reaction by providing a tough silicone rubber layer as the uppermost layer. CONSTITUTION:A photosensitive layer and a silicone rubber layer consisting of the inner layer consisting essentially of polyorganosiloxane and the outer layer are laminated on a substrate to constitute the water-free lithographic printing plate. In this case, the weight average mol.wt. of the polyorganosiloxane constituting the outer layer is made higher than that of the polyorganosiloxane constituting the inner layer, or the functional group in the outer layer is allowed to react with the functional group in the inner layer by irradiation with an active light beam. |
