Photographic elements incorporating chelated-metal quenching compounds
AssigneeEastman Kodak Company
InventorsWendell F. Smith, Jr, George A. Reynolds
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Abstract
A photographic element is disclosed containing one or more hydrophilic coatings thereon including an organic dye or precursor thereof dispersed in a water-immiscible solvent therefor. The solvent additionally includes therein a chelated-metal compound, termed a quenching compound, having a spectrophotometric absorption peak bathochromic relative to the absorption peak of the compound to be stabilized.
Claims20
A photographic element comprised of a support and containing one or more hydrophilic coatings thereon, at least one of which is radiation-sensitive, and at least one of said hydrophilic coatings including an organic dye selected from azine dyes, oxazine dyes, thiazine dyes, anthraquinone dyes, azo dyes, azomethine dyes, cyanine dyes, diphenylmethane dyes, triphenylmethane dyes, formazan dyes, induline dyes, indigoid dyes, phthalein dyes and pyronine dyes or a precursor of such a dye, dispersed in a water-immiscible solvent therefor,
- wherein the improvement comprises a stabilizing amount of a chelated-metal quenching compound incorporated within said water-immiscible solvent for said organic dye or dye precursor;
- said quenching compound having its longest wavelength absorption peak bathochromic to the longest wavelength absorption peak of said organic dye and having a structure selected from the group consisting of ##STR19## wherein:
- M is nickel, cobalt, copper, palladium or platinum;
- X and X' are independently selected from the group consisting of sulfur and oxygen;
- Cat.sup.+ is a cation;
- and A is ##STR20## wherein:
- R is hydrogen or alkyl, and R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, phenyl, substituted phenyl, nitrile and alkyl.
A photographic element comprised of a support and containing one or more hydrophilic coatings thereon, at least one of which is a radiation-sensitive silver halide emulsion, and at least one of said hydrophilic coatings including a photographic color coupler capable of forming an imaging dye selected from azo dyes and azomethine dyes upon reaction with an oxidized primary aromatic amine developing agent, said coupler being dispersed in a water-immiscible coupler solvent,
- wherein the improvement comprises at least 0.25 micro mole of a chelated-metal quenching compound per gram of coupler solvent having its longest wavelength absorption peak above about 600 nm and bathochromic to the longest wavelength absorption peak of said imaging dye and, in the presence of said imaging dye, providing a quenching efficiency greater than 1.0;
- said chelated-metal quenching compound having a structure selected from the group consisting of ##STR21## wherein:
- M is nickel, cobalt, copper, palladium or platinum;
- X and X' are independently selected from the group consisting of sulfur and oxygen;
- Cat.sup.+ is a cation;
- and A is ##STR22## wherein:
- R is hydrogen or alkyl, and R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, phenyl, substituted phenyl, nitrile and alkyl.
A photographic element comprised of a support and containing at least one radiation-sensitive gelatino-silver halide emulsion coating thereon, said emulsion having incorporated therein a subtractive primary azomethine dye-forming coupler dispersed in a high-boiling water-immiscible coupler solvent,
- wherein the improvement comprises from about 2.5 to 250 micromoles of a chelated-nickel quenching compound per gram of coupler solvent incorporated within said coupler solvent;
- said quenching compound having its longest wavelength absorption peak in the range of from about 800 nm to about 1200 nm and bathochromic to the longest wavelength absorption peak of said azomethine dye and, in the presence of said azomethine dye providing a quenching efficiency greater than 2.0;
- said chelated-nickel quenching compound having a structure selected from the group consisting of ##STR23## wherein:
- Cat.sup.+ is a cation;
- and A is ##STR24## wherein R is hydrogen or alkyl, and R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, phenyl, substituted phenyl, nitrile and alkyl.
Dependencies are inferred from the claim text.