| 摘要 |
<p>There is provided a photosensitive resin composition for a solvent-developing or thermally-developing flexographic printing plate, the photosensitive resin composition comprising: (a) a block copolymer containing a polymer block having conjugated diene as a main component and a polymer block having a vinyl aromatic hydrocarbon as a main component; (b) a photopolymerizable monomer; (c) a photopolymerization initiator; and (d) an organosilicon compound. A photosensitive resin composition for printing in which the organosilicon compound is a silicone oil containing a specific group is preferable, and a photosensitive resin composition for printing in which the organosilicon compound is a silicone oil containing an amino group or an aryl group is most preferable. by any of various methods. For example, there are following methods. A method may involve dissolving and mixing raw materials of the photosensitive resin composition in an appropriate solvent such as chloroform, tetrachloroethylene, methyl ethyl ketone or toluene, casting the solution into a mold and evaporating the solvent to make a plate-like construct. A method may involve, without using any solvent, kneading the mixture in a kneader, roll mill or screw extruder, and then molding it into a predetermined thickness by a calendar roll or press. However, the present invention is not limited to these preparation methods. For providing the protecting layer or the ultraviolet-ray shielding layer on the surface of the photosensitive resin layer, raw materials thereof may be dissolved or dispersed in an appropriate solvent with forced stirring by stirring blades or ultrasonic stirring; or the raw materials are pre-kneaded using an extruder or kneader and then dispersed or dissolved in an appropriate solvent, and the dispersion or solution may be coated directly on the photosensitive resin layer. Further, a cover sheet composed of polyester, polypropylene or the like may be provided on the protecting layer or the ultraviolet-ray shielding layer. Alternatively, a solution for the protecting layer or the ultraviolet-ray shielding layer is coated on a cover</p> |
