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    • 3. 发明授权
    • Silver halide emulsion and method of preparing the same
    • 卤化银乳剂及其制备方法
    • US5472837A
    • 1995-12-05
    • US189733
    • 1994-02-01
    • Tetsuo Okutsu
    • Tetsuo Okutsu
    • G03C1/015G03C1/005G03C1/035
    • G03C1/0051
    • A silver halide emulsion comprising 50% to 100% of projected area of all silver halide grains are occupied by hexagonal tabular silver halide grains which have an aspect ratio of 8 to 40, which have a ratio of the longest side to the shortest side of 1 to 2, and which have an average silver iodide content of 2 mol % to 10 mol %, and all silver halide grains have a grain size of variation coefficient of 8% to 20%. A method of preparing the emulsion described above, comprising a nucleation step and a grain-growing step and in which a dispersant used in the nucleation step is low-molecular gelatin having a molecular weight of 5,000 to 25,000, and nucleation time t (seconds) in the nucleation step satisfies the relationship of 1
    • 包含所有卤化银颗粒的投影面积的50%至100%的卤化银乳剂由具有8至40的纵横比的六角形片状卤化银颗粒占据,其中最长边与最短边之比为1 至2,平均碘化银含量为2mol%至10mol%,并且所有卤化银颗粒的变化系数的晶粒尺寸为8%至20%。 一种制备上述乳液的方法,包括成核步骤和晶粒生长步骤,其中在成核步骤中使用的分散剂是分子量为5,000至25,000的低分子明胶和成核时间t(秒) 在成核步骤满足1