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    Robust process for preparing high Br low COV tabular grain emulsions
    1.
    发明授权
    Robust process for preparing high Br low COV tabular grain emulsions 失效
    制备高Br低COV片状颗粒乳剂的稳健方法

    公开(公告)号：US5763151A

    公开(公告)日：1998-06-09

    申请号：US790347

    申请日：1997-01-24

    申请人： Thomas B. Brust ,  Philip J. Dale ,  Philip J. Zola ,  Terrence R. O'Toole

    发明人： Thomas B. Brust ,  Philip J. Dale ,  Philip J. Zola ,  Terrence R. O'Toole

    IPC分类号： G03C1/005 ,  G03C1/043 ,  G03C1/015 ,  G03C1/035

    CPC分类号： G03C1/0051

    摘要： A process is disclosed of preparing a photographic emulsion comprised of high bromide silver halide tabular grains accounting for greater than 90 percent of total grain projected area. The grains exhibit a low level of size dispersity by reason of forming in the presence of a dispersing medium containing a polyalkylene oxide block copolymer surfactant a population of silver halide grain nuclei containing twin planes, the halide content of the grain nuclei consisting essentially of silver bromide, and growing the silver halide grain nuclei containing twin planes to form the tabular silver halide grains. Inadvertent variation in tabular grain sizes and thicknesses from one precipitation to the next are minimized by growing the silver halide grain nuclei at a pH in the range of from 3.0 to 8.0 and in the presence of at least a 0.01M concentration of a partially dissociated acid having a pKa that is within 2.5 units of the pH and that forms a silver salt more soluble than the silver halide incorporated in the grains.

    摘要翻译： 公开了一种制备由高溴化银卤化银片状颗粒组成的照相乳剂占总颗粒投影面积的90％以上的方法。 由于在含有聚环氧烷烃嵌段共聚物表面活性剂的分散介质的存在下形成含有双面平面的卤化银颗粒核的颗粒，表现出较低的粒度分散度，晶核的卤化物含量基本上由溴化银 并且生长含有双平面的卤化银颗粒核以形成片状卤化银颗粒。 通过在3.0至8.0范围内的pH和在至少0.01M浓度的部分解离的酸的存在下生长卤化银颗粒核，使从一个沉淀到下一个沉淀的片状晶粒尺寸和厚度的无意的变化最小化 具有pH值在2.5单位内的pKa，并且形成比结合在晶粒中的卤化银更可溶的银盐。

    Process of conducting epitaxial deposition as a continuation of emulsion precipitation
    2.
    发明授权
    Process of conducting epitaxial deposition as a continuation of emulsion precipitation 失效
    导电外延沉积的过程是乳液沉淀的延续

    公开(公告)号：US6100019A

    公开(公告)日：2000-08-08

    申请号：US292436

    申请日：1999-04-15

    申请人： Thomas B. Brust ,  Philip J. Dale ,  Mark R. Mis ,  Donald L. Black

    发明人： Thomas B. Brust ,  Philip J. Dale ,  Mark R. Mis ,  Donald L. Black

    IPC分类号： G03C1/015 ,  G03C1/005 ,  G03C1/035 ,  G03C1/047

    CPC分类号： G03C1/0051

    摘要： A process is disclosed of conducting in a single reaction vessel selective site high chloride epitaxy deposition as a continuation of host high bromide {1111} tabular grain emulsion precipitation. A host tabular grain emulsion is precipitated accounting for 0.05 to 1.5 moles of silver per liter of dispersing medium. Any iodide at the major faces of the tabular grains is uniformly distributed and any iodide in a surface region of the grains amounts to less than 7 mole, based on silver in the surface region. Until epitaxy is formed, pH is held in the range of 3 to 8. Gelatino-peptizer in an amount of 1 to 40 grams per Ag mole is added to the emulsion. Chloride ion in a range of from 0.03 to 0.15 mole per liter is dispersed in the emulsion. pBr is held in the range of from 3.0 to 3.8 until epitaxy is formed. Iodide ion in a concentration of from 5.times.10.sup.-6 to 1.times.10.sup.-4 mole per square meter of grain surface area is uniformly adsorbed to the major surfaces of the tabular grains.

    摘要翻译： 公开了在单个反应容器选择性位置进行高氯化物外延沉积作为主体高溴酸盐（1111）片状颗粒乳液沉淀的延续的方法。 沉淀出主体片状颗粒乳剂，每升分散介质为0.05至1.5摩尔的银。 在片状颗粒的主面上的任何碘化物均匀分布，并且基于表面区域中的银，颗粒的表面区域中的任何碘化物均小于7摩尔。 直到形成外延，pH值保持在3至8的范围内。每摩尔Ag摩尔量为1至40克的明胶胶溶剂加到乳液中。 在0.03至0.15摩尔/升范围内的氯离子分散在乳液中。 pBr保持在3.0至3.8的范围内，直到形成外延。 浓度为5×10-6至1×10-4摩尔每平方米晶粒表面积的碘离子均匀地吸附到片状颗粒的主表面。