| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermal positive type lithographic printing original plate excellent in both of developing property and printing wear. <P>SOLUTION: The lithographic printing original plate is constituted by being provided with an intermediate layer containing a polymer compound and an image recording layer the solubility of which with an alkaline aqueous solution increases by heating in this order on a lithographic printing plate supporting body prepared by subjecting an aluminum plate to at least roughening treatment, anodic oxidation treatment and alkali metal silicate treatment, in this order. The plate has a 3 to 8 μm average pore diameter of micropores in the anodic oxidation film formed by the anodic oxidation treatment, 1 to 10 mg/m<SP>2</SP>amount of Si atoms depositing on the surface of the lithographic printing plate supporting body, and 10 to 40 mg/m<SP>2</SP>coating amount of the intermediate layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
