| 摘要 |
PURPOSE:To provide the original plate which has excellent flawing resistance and printing resistance, obviates the sticking of a photosensitive layer, is free from the peeling of the photosensitive layer in unexposed parts in printing process and has excellent dyed plate inspectability by forming the photosensitive layer of a photopolymerizable photosensitive compsn. contg. a urea bond-contg. polyurethane as a binder. CONSTITUTION:The photosensitive layer is the photopolymerizable photosensitive layer contg. the polyurethane having the urea bond as the binder. While any urea bond-contg. polyurethane is usable as if the polyurethane contains the urea bond in the molecule, the polyurethane having an ester bond and/or ether bond together with the urea bond is more preferable. The photosensitive layer of the damping waterless photosensitive planographic printing plate contains the urea bond-contg. polyurethane as the binder and, therefore, the waterless planographic printing plate has not only the high flawing resistance and high printing resistance but is also free from the sticking of the photosensitive layer and the peeling of the photosensitive layer in the unexposed parts. In addition, the plate has the excellent dyed plate inspectability. |
