Silver halide emulsion and method of preparing the same
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United States of America Patent
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Dec 5, 1995
Grant Date -
N/A
app pub date -
Feb 1, 1994
filing date -
Feb 2, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
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
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