| 摘要 |
PURPOSE:To eliminate thoroughly the influence of oxygen and to improve developability by incorporating a higher fatty acid into a photopolymerizable photosensitive resin thereby decreasing considerably the thickness of an oxygen barrier layer consisting of a water soluble resin to be provided on the surface of the photosensitive layer. CONSTITUTION:The photopolymerizable photosensitive layer of a lithographic printing plate provided successively with the photopolymerizable photosensitive layer and water soluble oxygen barrier layer at 1.5-0.1g/m<2> on an aluminum substrate subjected to anodic oxidation after sand graining is of the compsn. consisting of an ethylenic unsatd. addition polymerizable compd. which is liquid at an ordinary temp., a polymer which is soluble or swellable with an aq. alkali soln. and permits film formation, a photopolymn. initiator and the higher fatty acid which is solid at an ordinary temp. The higher fatty acid which is solid at an ordinary temp. is exemplified by a lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, lacceric acid, etc. the higher fatty acids having >=60 deg.C m.p. are particularly preferable among said acids. The amt. of the higher fatty acid to be added is 0.5-10wt%, more preferably 1-5wt% by the weight of the total compd. |
