| 摘要 |
PURPOSE:To obtain a titled original plate which has high photosensitivity and the spectral sensitivity expanded to a visible light region by providing a phenyl urethane resin layer, a specific photosensitive and heat-sensitive layer and a water soluble resin layer on a base having a hydrophilic surface. CONSTITUTION:A soln. contg. a phenyl urethane resin and an alkali-soluble resin (e.g.: a novolak resin) is coated to 2-50g/m<2> on a base having a hydrophilic surface and is dried, by which a phenol urethane resin layer is provided. A soln. contg. a Co(III) complex [ e.g.: hexaammin cobalt (III) perchlorate], a photoreducing agent (e.g.: 1-naphthyl disulfide), a hydrogen donor (e.g.: ethylene glycol), a chelating agent (e.g.: glyoxime) and a binder (e.g.: gelatin) is coated to 1-50g/m<2> thereon and is dried, by which a photosensitive and heat-sensitive layer is formed. A water soluble resin (e.g.: PVA) soln. is coated to 0.1-10g/m<2> thereon and is dried to form a water-soluble resin layer. |
