| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a printing original plate which makes laser engraving applicable, which reduces a work-up on the occasion of making a relief image by direct laser engraving and facilitates removal of the work-up and, in addition, which enables manufacture of a printing plate being excellent in the shape of engraving and causing little tackiness of a printing surface, and a manufacturing method therefor. <P>SOLUTION: The manufacturing method for a flexographic original plate comprises a process wherein a photosensitive resin composition containing (a) a resin of a number-average molecular weight of 1,000 to 500,000, (b) an organic compound having a polymerizable unsaturated group of a number-average molecular weight less than 1,000, (c) an inorganic porous body having a specific surface area of 10 to 1,500m<SP>2</SP>/g, an average pore diameter of 1 to 1,000nm, a pore capacity of 0.1 to 10ml/g and an oil absorption of 10 to 2,000ml/100g, and coloring dyestuff being made to color by a chemical reaction, is photo-set and molded into a sheetlike or cylindrical resin plate and wherein a layer that can be engraved by a laser is made, and a process wherein the dyestuff is made to color simultaneously with the photo-setting of the resin or thereafter. <P>COPYRIGHT: (C)2004,JPO |
