| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive lithographic printing original plate for an infrared laser for direct plate making excellent in sensitivity, development latitude and temporal stability of those. <P>SOLUTION: The lithographic printing original plate has on a support an underlayer formed by applying a coating liquid prepared by dissolving a water-insoluble but alkali-soluble resin, a cyclic acid anhydride and carboxylic acids in an organic solvent, and a positive recording layer containing an alkali-soluble resin and a development inhibitor and having solubility in an alkaline aqueous solution increased by exposure. The carboxylic acids are preferably a dibasic acid. <P>COPYRIGHT: (C)2007,JPO&INPIT |
