| 摘要 |
PURPOSE:To obtain a photosensitive layer with the high sensitivity and the excellent developing property by incorporating a specified high polymer compd. in the title composition. CONSTITUTION:The high polymer contains 1-50mol.% a structural unit com posed of an alcoholic hydroxyl group and/or a phenolic hydroxyl group, 5-40mol.% a structural unit shown by formula I, 5-40mol.% a unit composed of methyl acrylate, 25-60mol.% a structural unit shown by formula II and 2-30mol.% a structural unit of carboxyl group in a molecular structure, and is composed of a copolymer having a weight-average mol.wt. of 50,000-200,000. In formulas I and II, R<1> is hydrogen atom or alkyl group, R<2> is hydrogen atom or methyl group, etc., R<3> is 2-12C alkyl or alkyl substd. aryl group. Thus, the composition with the high sensitivity and the excellent developing property and plate wear is obtd. |
