| 摘要 |
PURPOSE:To improve plate wear and to obtain silver images having high ink acceptability by incorporating a specific compd. and an org. development inhibitor without contg. mercapto groups into the above developer. CONSTITUTION:The physical development accelerator expressed by formula I and the org. development inhibitor without having the mercapto groups are used in combination in the development processing liquid in the development of a direct planographic printing plate for which a silver complex salt diffusion transfer method is utilized. In the formula I, R denotes an alkyl group, allyl group, aralkyl group, hydroxyalkyl group; X denotes a hetero atom of Se, S, O, N or is a methylene group, alkyl substd. methylene group; Z denotes the atom group necessary for forming a 5-membered ring or 6-membered ring. The compd. expressed by the formula I can be easily synthesized and the amt. of this compd. to be added to the developer is preferably in a 0.01 to 10.0wt.% range, more preferably in a 0.01 to 4.0wt.% range. Benzotriazole or benzimidazole and its deriv. are particularly effective as the org. development inhibitor which has no mercapto groups and is to be used in combination. |
