| 摘要 |
PROBLEM TO BE SOLVED: To make the adhesive strength of a silicone rubber layer to a photosensitive layer independent of the moisture content of an atmosphere at the time of curing the silicone rubber layer and to obtain a printing plate having high ink repellency. SOLUTION: A photosensitive layer and a silicone rubber layer are successively formed on a substrate to produce the objective original plate for a waterless planographic printing plate. The silicone rubber layer has a compsn. consisting of 100 pts.wt. organopolysiloxane (a) having at least two vinyl groups bonding directly to Si atoms in one molecule, 0.1-10,000 pts.wt. organohydrogensiloxane (b) having at least two Si-H bonds in one molecule and an addition catalyst (c). The mol.wt. of at least one of the components (a), (b) is >=1,000 and the component (b) is brought into addition reaction to the photosensitive layer contg. a monomer or oligomer having photopolymerizable unsatd. bonds. |
