| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive photosensitive resin composition capable of forming an image superior in contrast between an image part and a nonimage and wide in development latitude and sufficient in film endurance, and more preferably, nonsensitive to ultraviolet rays and superior in handleability even under white fluorescent light and to provide the positive lithographic printing plate. SOLUTION: The positive photosensitive composition comprises a photothermoconverting material capable of absorbing light from an image exprosure light source and converting it into heat and a novolak resin and it contains no pyrolyzate obtained by decomposed the photothermoconverting material by action of the heat caused by absorbing the light of the exposure light source, and the novolak resin made from phenols comprising >=60 mol% o-cresol, and the positive lithographic printing plate is provided with a layer made from this photosensitive composition on the surface of a support. |
