PHOTOSENSITIVE COMPOSITION AND PLANOGRAPHIC PRINTING PLATE WITH DECREASED BLINDING TENDENCY

摘要

PURPOSE: To decrease the tendency for blinding of a printing plate and to obtain a printing plate which can be developed in a water-based alkali developer containing an org. solvent with a low concn. and is advantageous for the cost and environment by incorporating a diazo resin, an acid-substituted ternary acetal polymer having a specified structure and a specified copolyester. ;CONSTITUTION: This compsn. consists of a diazo resin, an acid-substd. ternary acetal polymer having a repeating unit expressed by formula I, and a copolyester of unsatd. discarboxylic acid and oxyalkylene ether of alkylidenediphenol. In formula I, R₁ is -H, -C_nH_2n+1, etc., (n) is 1 to 12, R₂ is expressed by formula II, R₃ is -(-CH₂-)_x-, etc., (x) is 0 to 8, R₄ is -H, -R₅, etc., R₅ is -OH, -CH₂OH, etc., R₆ is -(CH₂)_a-COOH, etc., (a) is 0 to 8, and n₁, n₂, n₃, n₄ and n₅ represent 0 to 25mol%, 2 to 25mol%, 10 to 70mol%, 10 to 60mol% and 10 to 45mol%, respectively.;COPYRIGHT: (C)1994,JPO