| 摘要 |
PURPOSE:To shorten development time and to prevent staining of a back ground by exposing the photosensitive material obtained by forming a coloring material layer containing a pigment on a thermoplastic resin layer and removing nonimage parts with a developing solution containing an alkali agent and an aromatic carboxylic acid or its salt. CONSTITUTION:A thermoplastic resin is used for the layer acting as a heat softened layer and a releasble layer and the heat softened layer comprises, for example, a vinyl acetate-ethylene copolymer, alcohol-soluble polyamide, polyvinyl acetate, or the like, and the releasable layer comprises, for example, silicone resins, and examples of a photosensitive material as the coloring material layer, are a system of a diazonium salt or its condensate mixed with polyvinyl alcohol or polyvinylpyrrolidone and the like. These photosensitive material are imagewise-exposed and the nonimage part is removed with the developing solution containing alkali agent, such as calcium silicate or the like. |
