| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal negative type lithographic printing original plate having a photosensitive layer featuring high sensitivity, excellent reproducibility in FM screening, and excellent print durability and chemical resistance at a minute image portion, and provide a photosensitive composition for the photosensitive layer.SOLUTION: A photosensitive composition at least contains an alkali-soluble resin having a monomer unit represented by the formula (I), at least one or more kinds of silane coupling agent, an infrared absorber, a radical-polymerizable initiator, and a polymerizable compound having an ethylenic double bond. In the formula (I), Rand Rrepresent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms which may have a substituent and Land Lrepresent an alkylene group having 1 to 10 carbon atoms which may have a substituent or an aryl group having 6 to 15 carbon atoms which may have a substituent. |
