| 摘要 |
PROBLEM TO BE SOLVED: To obtain good reproducibility of image and excellent storage stability, by forming such a photosensitive layer that contains a specified acetone pyrogallol resin having quinonediazido groups and an org. acid and that the acetone pyrogallol resin forms a crosslinked structure. SOLUTION: This waterless lithographic printing master plate consists of at least a primer layer, photosensitive layer and silicone rubber layer formed in this order on a substrate, and the photosensitive layer contains an acetone pyrogallol resin having a structure expressed by the formula and having quinonediazido groups, and org. acid. The acetone pyrogallol resin forms a crosslinked structure. The acetone pyrogallol resin is esterified with 1,2- naphthoquinone-2-diazide-5-sulfonic chloride and the like. In the formula, X, Y and Z are independently hydroxyl groups or ester groups of sulfonic acid of quinonediazide, and n is an integer 5 to 12. |
