| 摘要 |
PURPOSE:To process both of negative type and positive type photosensitive lithographic printing plates by using a developing soln. compsn. into which an alkali agent, specific org. solvent, anionic surface active agent and sulfite are incorporated and which is adjusted to a specific pH range. CONSTITUTION:The following materials are incorporated into the developing soln. compsn. to prepare and compsn.: A): the alkali agent, for example, sodium silicate, B): the org. solvent having <=10wt% solubility with water at 20 deg.C, for example, monophenyl ether of ethylene glycol, benzyl alcohol or benzyl ether of ethylene glycol, C): the anionic surface active agent and D): the sulfite are incorporated therein and the pH of the compsn. is adjusted to a 11.5-13.3 range. Since such developing soln. compsn. is used in the above-mentioned pH range, both of the negative type photosensitive lithographic printing plate and the positive type photosensitive lithographic printing plate are adequately processed. |
