Silver halide photographic emulsion and light-sensitive material containing the same
AssigneeFuji Photo Film Co., Ltd.
InventorsMakoto Kikuchi, Naohiro Takeda, Yoichi Maruyama, Yuzo Toda, Masaaki Miki
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Abstract
A silver halide photographic emulsion comprising silver halide grains is disclosed, which is obtained through a process including at least one step of forming grains using a dispersion medium having a low viscosity, wherein 50% or more of the entire projected area of all silver halide grains in the emulsion is occupied by silver halide tabular grains having an aspect ratio of 4 or more and a twin plane spacing of 0.012 μm or less. Further disclosed is a silver halide color photographic light-sensitive material using the emulsion.
Claims8
A process for producing a silver halide emulsion comprising silver halide grains, which is obtained through a process including at least one step of forming grains using a dispersion medium having a low viscosity, wherein the dispersion medium having a low viscosity comprises a polypeptide as a protective colloid, 50% or more of the entire projected area of all silver halide grains in the emulsion is occupied by silver halide tabular rains having an aspect ratio of 4 or more and a twin plane spacing of 0.012 μm or less, and the low viscosity is a region lower than the viscosity η of the dispersion medium obtained by the following formula (1):
- η=(2.8159−0.0743T)exp{(0.1479−0.0017T)C} (1)
- wherein η is a viscosity (cp) of the dispersion medium, T is the temperature (° C.) of the dispersion medium and C is the concentration (wt %) of the polypeptide in the dispersion medium.
Dependencies are inferred from the claim text.