PHOTOSENSITIVE ELASTOMER COMPOSITION AND PHOTOSENSITIVE RUBBER PRINTING PLATE

摘要

A photosensitive rubber printing plate having an excellent plate wear balance and a high ability to reproduce images, and a photosensitive elastomer composition for use in producing the plate. The composition is prepared by kneading a mixture of 65 parts by weight of a phosphated random copolymer (with a monomer composition of 60 % butadiene, 9 % methyl methacrylate, 20 % ethylene phosphate methacrylate, 10 % styrene, and 1 % divinylbenzene), 35 parts by weight of a polystyrene-polybutadiene-polystyrene block copolymer, 15 parts by weight of 1,7-heptanediol dimethacrylate, 1 part by weight of benzoin methyl ether, and 0.02 part by weight of methylhydroquinone. A 3 mm thick photosensitive rubber printing plate is produced by sandwiching the compositive between two polyester films and pressing the laminate on a press.