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1.发明授权
公开(公告)号：US5726007A
公开(公告)日：1998-03-10
申请号：US722403
申请日：1996-09-30
CPC分类号： G03C1/0051 , G03C1/07
摘要： A photographic emulsion is disclosed comprised of coprecipitated radiation-sensitive silver halide grains containing greater than 70 mole percent bromide, based on silver, and exhibiting a coefficient of variation of less than 30 percent. Greater than 90 percent of total projected area of the grains is accounted for by tabular grains having {111} major faces, exhibiting a thickness of less than 0.07 .mu.m, and having latent image forming silver salt epitaxy chemical sensitization sites on their surfaces, and a dispersing medium that contains a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for from 4 to 96 percent of the molecular weight of the polymer. The emulsions offer unexpectedly low levels of minimum density and can be more easily manufactured as compared to conventional ultrathin tabular grain emulsions with comparably limited grain dispersity.
摘要翻译： 公开了一种照相乳剂，其包含基于银的含有大于70mol％溴的共沉淀的辐射敏感卤化银颗粒，并且显示出小于30％的变异系数。 晶粒总投影面积的90％以上占{111}主面，厚度小于0.07微米，表面形成银盐外延化学致敏点的潜像， 包含聚环氧烷嵌段共聚物表面活性剂的颗粒分散降低浓度的分散介质，其由亲水性烯化氧嵌段单元连接的两末端亲脂环氧烷嵌段单元构成，占聚合物分子量的4至96％。 与具有相当有限的颗粒分散性的常规超薄片状颗粒乳剂相比，乳液提供了意想不到的最低密度水平，并且可以更容易地制造。
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公开(公告)号：US5728517A
公开(公告)日：1998-03-17
申请号：US656019
申请日：1996-05-31
CPC分类号： G03C1/0051 , G03C1/18
摘要： Tabular grain emulsions of enhanced photographic sensitivity are disclosed in which the tabular grains contain a maximum surface iodide concentration along their edges and a lower surface iodide concentration within their corners than elsewhere along their edges. The grains contain a dopant capable of providing shallow electron trapping sites.
摘要翻译： 公开了增强的照相感光度的片状颗粒乳剂，其中片状颗粒沿其边缘含有最大表面碘化物浓度，并且在它们的角落内沿其边缘含有较低的表面碘化物浓度。 晶粒含有能够提供浅电子捕获位点的掺杂剂。
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