Image stabilizer for silver halide photographic material comprising water soluble bismuth compound
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsMasayuki Kurematsu, Shigeharu Koboshi
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Abstract
An image stabilizer for silver halide photographic materials which contains a water-soluble bismuth compound is disclosed. In a preferred embodiment, the stabilizer also contains a water soluble chelating agent capable of forming a bismuth complex or its salt having a stability constant (-log KMA) of 3 or more, said constant being represented by formula (I): KMA=([MA]/[M] [A]) (I) wherein M is a bismuth ion and A is a complex forming anion. By using this stabilizer, the processed dye image is kept stable over an extended period and the occurrence of yellow stain in the non-image area is inhibited. The stabilizer is applicable not only to color photographic materials but also to black-and-white materials.
Claims9
A dye image stabilizer for stabilizing a processed image on a silver halide photographic material consisting of:
- (a) water and
- (b) a water-soluble bismuth compound which is a bismuth complex or its salt chelated with a metal ion chelating agent capable of forming a bismuth complex or its salt having a stability constant (-log KMA) of 3 or more, said constant being represented by Formula (I):
- KMA=([MA]/[M][A]) (I)
- wherein M is a bismuth ion and A is a complex forming anion.
A dye image stabilizing aqueous solution for stabilizing a processed image on a silver halide photographic material consisting essentially of:
- (a) water,
- (b) a water-soluble bismuth compound to stabilize said dye image produced by developing an imagewise exposed silver halide photographic material, the bismuth compound being a bismuth complex or its salt chelated with a metal ion chelating agent capable of forming a bismuth complex or its salt having a stability constant (-log KMA) of 3 or more, said constant being represented by Formula (I):
- KMA=([MA]/[M][A]) (I)
- wherein M is a bismuth ion and a is a complex forming anion, and
- (c) one or more image stabilizer additives selected from the group consisting of buffers, surfactants, mold inhibitors, preservatives, organosulfur compounds, yellow stain inhibitors, brightening agents, and UV absorbers.
A dye image stabilizer for stabilizing a processed image on a silver halide photographic material comprising:
- (a) water and
- (b) a water-soluble bismuth compound which is a bismuth complex or its salt chelated with a metal ion chelating agent capable of forming a bismuth complex or its salt having a stability constant (-log KMA) of 3 or more, said constant being represented by Formula (I):
- KMA=([MA]/[M][A]) (I)
- wherein M is a bismuth ion and A is a complex forming anion.
Dependencies are inferred from the claim text.