| 摘要 |
PURPOSE:To obtain a developer for a direct planographic printing plate utilizing a silver complex salt diffusion transfer process, improving defects such as chipping off in a transferred silver image, considerably enhancing printing resistance and not reducing ink receptivity. CONSTITUTION:This developer for a direct planographic printing plate contains a silver complex salt diffusion transfer accelerator represented by the formula and an org. development inhibitor having no mercapto group. In the formula, Z is 0, S or NR3, R1 is alkyl, aryl or aralkyl, each of R2 and R3 is H, alkyl, aryl, aralkyl or dialkylamino and R1 and R2 or R2 and R3 may form a ring. |
