| 摘要 |
PURPOSE:To provide high sensitivity and high printing resistance by blending a diazo compound with a composition consisting essentially of an acrylic copolymer contg. polybutadiene, a cross-linking agent and a photopolymn. initiator. CONSTITUTION:This photosensitive resin composition is obtd. by blending a diazo compound with a composition consisting essentially of a multicomponent type copolymer, a cross-linking agent and a photopolymn. initiator. The copolymer has >=20,000mol.wt. and consists of 0.1-5wt% polybutadiene, 5-70wt% alkyl acrylate or alkyl methacrylate, 20-70wt% unsatd. carboxylic acid and 5-60wt% styrene or alkylstyrene as constituent units. The total amount of the copolymer, the cross-linking agent and the initiator is 5-50wt% of the amount of the diazo compound. When the photosensitive resin composition is used, a tough and flexible image is formed, and an offset printing plate with high sensitivity and high printing resistance can be manufactured. |
