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    • 8. 发明授权
    • Ultrathin tabular grain silver halide emulsion with improved performance in multilayer photographic element
    • 具有改善多层照相元件性能的超薄片状银卤化银乳剂
    • US06656674B2
    • 2003-12-02
    • US10027300
    • 2001-12-21
    • Tommie L. Royster, Jr.John E. Keevert, Jr.Sharon G. JohnstonDonald L. BlackDavid W. Sandford
    • Tommie L. Royster, Jr.John E. Keevert, Jr.Sharon G. JohnstonDonald L. BlackDavid W. Sandford
    • G03C1005
    • G03C1/0051G03C2001/03511G03C2001/03552G03C2001/03564G03C2200/03
    • A photographic element which comprises a support bearing: (i) a first radiation-sensitive silver halide emulsion image-forming layer comprising a high bromide tabular grain emulsion including tabular grains having {111} major faces, exhibiting an average thickness of at least 0.07 &mgr;m and an average aspect ratio of at least 2; and (ii) a second radiation-sensitive silver halide emulsion image-forming layer comprising an ultrathin tabular grain emulsion including tabular grains having {111} major faces, containing greater than 70 mole percent bromide and at least 0.25 mole percent iodide, exhibiting an average thickness of less than 0.07 &mgr;m and an average equivalent circular diameter of at least 0.7 &mgr;m, and having latent image forming chemical sensitization sites on the surfaces of the tabular grains; wherein the surface chemical sensitization sites include epitaxially deposited silver halide protrusions containing an actual chloride concentration of from 20-50 mole %, based on epitaxially deposited silver, the chloride concentration being at least 10 mole percent higher than that of the tabular grains, and containing an actual iodide concentration of from 1 to 7 mole %, based on epitaxially deposited silver.
    • 一种照相元件,其特征在于,包括一支承体:(i)第一辐射敏感的卤化银乳剂图像形成层,其包含高溴化物片状颗粒乳剂,其包含具有{111}主面的平片状颗粒,平均厚度至少为0.07μm 平均纵横比至少为2; 和(ii)包含超薄片状颗粒乳剂的第二种辐射敏感的卤化银乳剂图像形成层,其包括具有{111}主面的片状颗粒,其含有大于70摩尔%的溴化物和至少0.25摩尔%的碘化物, 厚度小于0.07μm,平均当量圆直径至少为0.7μm,并且在片状颗粒的表面上具有潜像形成的化学敏化位点; 其中所述表面化学增感部位包括外延沉积的银离子突出物,所述外延沉积的卤化银突起物以外延沉积的银为基准,其实际氯化物浓度为20-50摩尔%,氯化物浓度比片状颗粒高至少10摩尔%,并含有 实际的碘化物浓度为1至7摩尔%,基于外延沉积的银。