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1. 发明授权

US3721559A Photographic material for the preparation of printing plates 失效
标题翻译：用于制作印刷版的摄影材料
公开(公告)号：US3721559A
公开(公告)日：1973-03-20
申请号：US3721559D
申请日：1971-08-23
申请人： AGFA GEVAERT NV
发明人： DE HAES L , GEVERS H , VANHEERTUM J
IPC分类号： G03F7/06 , G03F7/02
CPC分类号： G03F7/063
摘要： A planographic printing plate is prepared from a photographic sheet material comprising a support, a light-sensitive silver halide emulsion layer and an exterior hydrophilic colloid stratum having at its free surface a pattern of finely divided silver particles, by contacting the same with an aqueous alkaline fixer composition containing an oxidizing agent for metallic silver and an organic thione, or mercapto tautomer thereof, for converting the pattern of silver particles into a hydrophobic ink-receptive pattern, the colloid stratum being hardened before the material is used for printing and preferably before or at least concurrently with its contact with said fixer composition, the extent of the hardening being at least that necessary to prevent removal of the colloid material during printing. The pattern of silver particles is produced by means of the silver complex diffusion transfer process in which insoluble development nuclei are applied to the free layer surface either from the diffusion transfer developing liquid or a separate liquid applied prior to the developing liquid. Preferably the colloid stratum is hardened by means of a latent hardener released during the course of the diffusion transfer process. The colloid stratum can be an external stratum of the emulsion layer or a separate colloid layer applied to the emulsion layer.

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