Color photographic element with improved resistance to thermal and photochemical yellowing and method thereof
AssigneeEastman Kodak Company
InventorsKrishnan Chari, Wendell F. Smith, Sundaram Krishnamurthy
Life of this patent
Estimating the term…
Abstract
Yellowing of a processed photographic element is inhibited by incorporating a scavenger comound capable of reacting with magenta coupler, e.g. an epoxy compound, in a layer adjacent a layer containing the magenta coupler. In a preferred embodiment, the magenta coupler containing layer is sandwiched between layers containing the scavenger compound. Prior to processing at least one of these layers contains a solubilizing agent for the scavenger compound. In preferred embodiments, the processing solution used to process the photographic element containing an external solubilizing agent for the scavenger compound, preferably benzyl alcohol.
Claims21
A multilayer color photographic element comprising a support having coated thereon:
- (a) a photosensitive first layer comprising
- (i) a silver halide emulsion and
- (ii) a magenta coupler dispersed therein;
- and
- (b) a second layer comprising a scavenger compound capable of reacting with the magenta coupler to produce a product which is resistant to yellowing, wherein at least one of said first and second layers contains a pH dependent solubilizing agent capable of dissolving the scavenger compound at a pH above about 8, but not at lower pH values;
- and
- (c) a third layer which comprises a scavenger compound capable of reacting with the magenta coupler, wherein said first layer is positioned between and adjacent to said second and third layers.
A method of improving the resistance to yellowing of a color photographic element after processing, which method comprises
- (A) exposing a photographic element to light to produce a desired latent image thereon, said element comprising a support having coated thereon:
- (a) a photosensitive first layer comprising
- i) an aqueous silver halide emulsion and
- ii) a magenta coupler dispersed therein, and
- (b) a second layer which comprises a scavenger compound capable of reacting with the magenta coupler to produce a product which is resistant to yellowing;
- wherein at least one of said layers contains a pH dependent solubilizing agent for the scavenger compound capable of solubilizing the scavenger compound at a pH above about 8, but not at lower pH values;
- and
- (c) a third layer which comprises a scavenger compound capable of reacting with the magenta coupler;
- wherein said first layer is positioned between and adjacent to said second and third layers;
- and
- (B) processing the element after exposure with a developer solution having a pH above about 8.
A multilayer color photographic element comprising a support having coated thereon:
- (a) a photosensitive first layer comprising
- (i) a silver halide emulsion and
- (ii) a magenta coupler dispersed therein;
- and
- (b) a second layer comprising a scavenger compound capable of reacting with the magenta coupler to produce a product which is resistant to yellowing;
- wherein at least one of said layers contains a pH dependent solubilizing agent capable of dissolving the scavenger compound at a pH above about 8, but not at lower pH values, and wherein the solubilizing agent comprises a long chain fatty acid.
A method of improving the resistance to yellowing of a color photographic element after processing, which method comprises
- (A) exposing a photographic element to light to produce a desired latent image thereon, said element comprising a support having coated thereon:
- (a) a photosensitive first layer comprising
- i) an aqueous silver halide emulsion and
- ii) a magenta coupler dispersed therein, and
- (b) a second layer which comprises a scavenger compound capable of reacting with the magenta coupler to produce a product which is resistant to yellowing;
- wherein at least one of said layers contains a pH dependent solubilizing agent for the scavenger compound capable of solubilizing the scavenger compound at a pH above about 8, but not at lower pH values, and wherein the solubilizing agent comprises a long chain fatty acid;
- and
- (B) processing the element after exposure with a developer solution having a pH above about 8.
Dependencies are inferred from the claim text.