| 摘要 |
Disclosed is a method for preparing a planographic printing plate in which a master planographic printing plate which has both a photosensitive layer (which contains (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye (D) and a binder polymer) and a protective layer, in that order, is laser-exposed on a hydrophilic support body, and thereafter the protective layer and the photosensitive layer of the unexposed portion are removed in the presence of a developer solution. By means of the method for preparing a planographic printing plate in which the aforementioned developer solution has a pH greater than or equal to 2 but less than 10 and contains a zwitterionic surfactant and a nonionic surfactant having an alkylene oxide chain, a planographic printing plate can be obtained which can achieve excellent development, has good printing durability, does not produce print stains, and makes possible a one-liquid-one-step simple process not requiring a washing step. |
