| 摘要 |
PROBLEM TO BE SOLVED: To obtain a waterless lithographic printing plate superior in image reproducibility and storage stability and good in printing durability by incorporating an acetone-pyrogallol resin having quinonediazido groups and a polyurethane resin having hydroxy groups and by forming a cross-linked structure with an isocyanat compound in a photosensitive layer. SOLUTION: This waterless lithographic printing plate is formed by laminating a primer layer, photosensitive layer and a silicone rubber layer in this order on a substrate. The photosensitive layer contains an acetone-pyrogallol resin having quinonediazido groups and a polyurethane resin having hydroxy groups whose the glass transition temp. is <=-5 deg.C to form a cross-linked structure by the isocyanat compound. The acetone-pyrogallol resin is represented by the formula in which each of X, Y and Z is, independently, a hydroxy or quinonediazido group and (n) is an integer of 5-12. The photosensitive layer contains the isocyanate compound in the amount of 5-45 weight % to the acetone-pyrogallol resin having the quinonediazido groups. |
