| 摘要 |
PURPOSE:To develop an exposed photosensitive layer with only water without requiring an org. solvent by using a latex polymer having cationic groups, a water-soluble ethylenic unsated. compound having anionic groups, and a photopolymn. initiator. CONSTITUTION:This photosensitive resin composition consists essentially of a latex polymer having cationic groups, a water-soluble ethylenic unsatd. compound having anionic groups, and a photopolymn. initiator. Since the latex polymer and the ethylenic unsatd. compound are dissolved or dispersed well in water because of the ionized state, the photosensitive resin composition requires only water as a solvent. When the composition is exposed, the uncured parts are dissolved in water and removed, and the cured parts are made hydrophobic by the physical and chemical bond of a polymer of the unsatd. compound to the latex polymer to form a film of high strength. At this time, environmental pollution and safety and hygienic problems are not caused. When the photosensitive resin composition is used in the manufacture of a printing plate, the cured parts are not swollen, so the parts have satisfactory resolving power and high ink retentivity. |
