POSITIVE PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE AND PHOTOMECHANICAL PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a photomechanical process for a positive photosensitive planographic printing plate having a large development latitude and excellent in processing stability. SOLUTION: The positive photosensitive planographic printing plate has a positive photosensitive composition layer containing a photothermal converting material and an alkali-soluble resin on the base and a layer not substantially containing a photothermal converting material on the photosensitive composition layer.