| 摘要 |
PURPOSE:To improve the affinity of the title composition against a printing ink, namely the forming property against an ink, and the removing property against a gum of the composition without deteriorating various kinds of the characteristics such as the development property of the composition by incorporating a copolymer contg. an unit derivated from a specified monomer as a constituting component, in the photosensitive composition. CONSTITUTION:The copolymer contg. the unit derivated from a monomer shown by formula I as the constituting component is incorporated in the photosensitive composition. In formula I, (n) is 0 or 1, when (n) is 1, X is a divalent group capable of binding oxygen atom and a group Y, Y is a polymer component contg. a structural unit shown by formula II and having >=500 number average mol.wt., R<1> is hydrogen atom or methyl group. In formula II, R<2> is hydrogen atom or methyl group, R<3> is >=2C aliphatic hydrocarbon group which may be substd. Thus, the photosensitive planographic printing plate which has the excellent forming property against the ink and removing property against the gum, and a less tendency for generating a faulty forming property even in case of printing, is obtd. without deteriorating the development property of the composition. |
