申请人:Eastman Kodak Company
公开号:US05976778A1
公开(公告)日:1999-11-02
A process of preparing a radiation-sensitive silver halide emulsion is disclosed in which the silver halide grains form dispersed clumps. A population of fine silver halide grains is precipitated at higher concentrations than previously taught for preparing this type of an emulsion by employing a peptizer limited in amount, limited in methionine content, or both. Following formation of the grains, they are aggregated into clumps by the addition of a surfactant, optionally assisted by the adding iodide, increasing pH or both. The grain clumps are stabilized against further aggregation by adding a high methionine peptizer and optionally assisted by the precipitation of additional silver halide.
本发明公开了一种制备辐射敏感的银卤化物乳剂的过程,其中银卤化物晶粒形成分散的团块。通过采用限量的胶化剂,限量的蛋氨酸含量或两者结合,以比先前教导制备此类乳剂更高的浓度沉淀出一种细小的银卤化物晶粒。在晶粒形成后,通过添加表面活性剂将它们聚集成团块,可以选择性地辅以碘化物、提高pH值或两者结合。通过添加高蛋氨酸胶化剂稳定晶粒团块,可以选择性地辅以沉淀额外的银卤化物以防止进一步聚集。