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    Epitaxially sensitized ultrathin dump iodide tabular grain emulsions
    1.
    发明授权
    Epitaxially sensitized ultrathin dump iodide tabular grain emulsions 失效

    公开(公告)号：US5641618A

    公开(公告)日：1997-06-24

    申请号：US590961

    申请日：1996-01-24

    申请人： Xin Wen ,  Richard Lee Daubendiek ,  Donald Lee Black ,  Joseph Charles Deaton ,  Timothy Richard Gersey ,  Joseph George Lighthouse ,  Myra Toffolon Olm ,  Robert Don Wilson

    发明人： Xin Wen ,  Richard Lee Daubendiek ,  Donald Lee Black ,  Joseph Charles Deaton ,  Timothy Richard Gersey ,  Joseph George Lighthouse ,  Myra Toffolon Olm ,  Robert Don Wilson

    IPC分类号： G03C1/005 ,  G03C1/12 ,  G03C1/46 ,  G03C1/035

    CPC分类号： G03C1/0051 ,  G03C1/12 ,  G03C1/46

    摘要： An improved spectrally sensitized ultrathin tabular grain emulsion is disclosed in which tabular grains (a) having {111} major faces, (b) containing greater than 70 mole percent bromide, based on silver, (c) accounting for greater than 90 percent of total grain projected area, (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, (e) exhibiting an average thickness of less than 0.07 .mu.m, and (f) having latent image forming chemical sensitization sites on the surfaces of the tabular grains, are spectrally sensitized and improved by employing dump iodide host tabular grains and, in forming the surface chemical sensitization sites, at least one silver salt epitaxially located on the tabular grains.A photographic element is disclosed comprised of a support, a first silver halide emulsion layer coated on the support and sensitized to produce a photographic record when exposed to specular light within the minus blue visible wavelength region of from 500 to 700 nm, a second silver halide emulsion layer capable of producing a second photographic record coated over the first silver halide emulsion layer to receive specular minus blue light intended for the exposure of the first silver halide emulsion layer, the second silver halide emulsion layer being capable of acting as a transmission medium for the delivery of at least a portion of the minus blue light intended for the exposure of the first silver halide emulsion layer in the form of specular light, wherein the second silver halide emulsion layer is comprised of the improved spectrally sensitized ultrathin tabular grain emulsion of the invention.The ultrathin dump iodide tabular grain emulsions with silver salt epitaxy chemical sensitization have been observed to produce larger than expected speed increases, to produce higher than expected contrasts, to be unexpectedly specularly transmissive and therefore compatible with forming sharp photographic images in underlying emulsion layers, to exhibit a higher percentage of total light absorption in the wavelength region of maximum absorption by the spectral sensitizing dye or dyes employed, and to exhibit a surprising tolerance of inadvertent manufacturing variances.

    Limited dispersity epitaxially sensitized ultrathin tabular grain emulsions
    3.
    发明授权
    Limited dispersity epitaxially sensitized ultrathin tabular grain emulsions 失效
    有限的分散性外延敏化超薄片状颗粒乳剂

    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。