公开(公告)号：US5726007A

公开(公告)日：1998-03-10

申请号：US722403

申请日：1996-09-30

申请人： Joseph Charles Deaton ,  David Earl Fenton ,  Allen Keh-Chang Tsaur

发明人： Joseph Charles Deaton ,  David Earl Fenton ,  Allen Keh-Chang Tsaur

IPC分类号： G03C1/005 ,  G03C1/07 ,  G03C1/035 ,  G03C1/043

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。

公开(公告)号：US5716774A

公开(公告)日：1998-02-10

申请号：US724722

申请日：1996-09-30

申请人： Robert Edward Dickerson ,  Allen Keh-Chang Tsaur

发明人： Robert Edward Dickerson ,  Allen Keh-Chang Tsaur

IPC分类号： G21K4/00 ,  G03C1/00 ,  G03C1/005 ,  G03C1/035 ,  G03C1/46 ,  G03C5/17 ,  G03C5/16

CPC分类号： G03C1/0051 ,  G03C5/17 ,  Y10S430/167

摘要： A radiographic element is disclosed in which from 10 to 60 percent of total silver forming the spectral sensitized silver halide grains is provided by one or more ultrathin tabular grain emulsions. It has been discovered that by limiting the proportions of ultrathin tabular grains desirably cold image tones can be obtained while improving other performance characteristics, including achieving significant reductions in crossover.

摘要翻译： 公开了一种放射线照相元件，其中形成光谱增感卤化银颗粒的总银的10％至60％由一种或多种超薄片状颗粒乳剂提供。 已经发现，通过限制超薄片状颗粒的比例，期望可以获得冷图像色调，同时改善其他性能特征，包括实现交叉显着降低。