| 摘要 |
PURPOSE:To improve scratch resistance of an ink repelling layer, folding resistance and wear restance of a plate by raising Vickers hardness of surface of a primer layer consisting of one layer higher than Vickers hardness of the inside. CONSTITUTION:In a photosensitive planographic printing plate unnecessitating damping water which has at least the primer layer, a photosensitive layer and the ink repelling layer on the supporting body, the primer layer consists of one layer and the Vickers hardness of surface of the primer layer is higher than the Vickers hardness of the inside. In this case, the Vickers hardness of surface means Vickers hardness upto 0.3mu in the depth from the primer layer surface of the ink repelling layer side, and the Vickers hardness of the inside means Vickers hardness at a deeper part than 0.3mu in the depth from the primer layer surface or the surface of the photosensitive layer. Besides after a coating liquid is applied on the supporting body, the primer layer is provided by curing it. |
