| 摘要 |
PURPOSE:To obtain an original plate for a planographic printing plate requiring no dampening water, having superior image reproducibility and processable with a relatively mild developing soln., by incorporating a polymer having a specified photosensitive group in the side chain into a photosensitive layer. CONSTITUTION:A photosensitive layer and a silicone rubber layer are successively laminated on a support and a polymer having a photosensitive group represented by formula I in the side chain is incorporated into the photosensitive layer. In formula I, each of R1 and R2 is alkyl and R1 and R2 may bond to each other to form a 5- or 6-membered ring. The support may be a coated paper, metallic sheet, film of plastics such as polyethylene terephthalate, rubber sheet or a composite support of such materials. A photosensitive planographic printing original plate for a planographic printing plate requiring no dampening water, having superior image reproducibility and processable with a relatively mild developing soln. is obtd. |
