Photographic dye image stabilization
AssigneeEastman Kodak Company
InventorsWendell F. Smith, Jr., Kenneth L. Eddy, Donald P. Harnish
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Abstract
A photographic element is disclosed comprised of a support and at least one layer containing a photographic imaging dye or its precursor. The imaging dye is chosen to have an absorption peak below 590 nm. An azomethine dye having an absorption peak above 700 nm is associated with the imaging dye or its precursor within the photographic layer. The azomethine dye reduces the rate of fading of the imaging dye upon exposure to visible light. A process for stabilizing a photographic dye image is also disclosed.
Claims27
A method of forming an image having improved stability in a photographic element containing a photosensitive silver halide emulsion layer, comprising
- associating in the element (i) a photographic coupler capable of reacting with the oxidized form of a pre-selected primary aromatic amine developing agent to form an imaging dye having an absorption peak below 590 nm, and (ii) a photographic coupler capable of reacting with the oxidized form of the pre-selected developing agent to form an azomethine dye having an absorption peak above 700 nm,
- imagewise exposing the element,
- developing the element with the pre-selected developing agent to form the imaging dye and the azomethine dye.
In a photographic element comprised of a support and a dye image in at least one layer containing a photographic imaging dye having an absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, the improvement comprising
- an azomethine dye having an absorption peak above 700 nm associated with said imaging dye within said layer in an amount sufficient to reduce the rate of fading of said dye image upon exposure to visible or ultraviolet radiation.
In a photographic element comprised of a support and at least one layer containing a photographic dye image formed by an azomethine dye having an absorption peak below 590 nm in wavelength, said azomethine dye being located in said layer within a dispersing medium, the improvement comprising
- an azomethine dye having an absorption peak above 700 nm located within said dispersing medium within said layer in an amount of at least 0.25 micromole per gram of said dispersing medium.
A method for preserving the appearance upon exposure to visible or ultraviolet radiation of a dye image in a photographic element containing in at least one layer an imaging dye having its absorption peak below 590 nm, wherein said dye image is formed as a result of silver halide development, comprising
- associating with the imaging dye within said layer, in an amount sufficient to reduce the rate of fading thereof, an azomethine dye having its absorption peak above 700 nm.
Dependencies are inferred from the claim text.