| abstract |
PURPOSE:To improve the printability, the water resisting property and the shelf-life stability of a printing plate by incorporating a specified organopolysiloxane in the titled composition. CONSTITUTION:Said organopolysiloxane contains one or more of each siloxane unit shown by formulas I and II in a molecule. In the formulas, R<1> is alkylene group, R<2> and R<3> are each a (un)substd. monovalent hydrocarbon group, (a) and (b) are each 0, 1 or 2, (c) is 1, 2 or 3. The titled composition comprises 100pts.wt. a resin mixture which is composed of 0.1-50wt.% said polysiloxane and 99.9-50wt.% polyvinyl alcohol, 1-100pts.wt. of a nonsilicone type compd. contg. an active hydrogen atom. and an unsatd. group (such as tetramethylol methane triacrylate), 0.01-20pts.wt. a photocrosslinking agent (such as diazo resin), 0-10pts.wt. an optical sensitizer (such as ethylbenzophenone) and 40-800 pts.wt. water. |