Diffusion transfer elements comprising color-providing compounds capable of cleavage upon reaction with silver ions and silver ion barrier layers
AssigneePolaroid Corporation
InventorsRonald F. W. Cieciuch, Roberta R. Luhowy, Frank A. Meneghini, Howard G. Rogers
Life of this patent
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Abstract
A silver ion scavenger layer is employed between adjacent silver halide strata to enhance color separation in multicolor photographic images prepared by processes which utilize the imagewise distribution of silver ions and/or soluble silver complex made available during development to liberate a corresponding imagewise distribution of dye or dye intermediate from a color-providing compound.
Claims52
A photographic product which comprises a photosensitive element comprising a plurality of layers including a support, at least two selectively sensitized silver halide emulsion layers, each of said emulsion layers having associated therewith a color-providing compound capable of undergoing cleavage in the presence of an imagewise distribution of silver ions and/or soluble silver complex to liberate a color-providing moiety in an imagewise distribution corresponding to said distribution of silver ions and/or said complex, one of said color-providing compound and said color-providing moiety being diffusible in aqueous alkaline solution and the other being substantially non-diffusible in aqueous alkaline solution, and a scavenger layer containing a scavenger for silver ion and/or soluble silver complex, said scavenger layer being positioned between said two selectively sensitized silver halide emulsion layers, each of said color-providing compounds being a compound containing a group selected from ##STR18##
A product as defined in claim 10 wherein X is ##STR20##
A photographic process for forming multicolor images comprising the steps of
- a. exposing a photosensitive element comprising a plurality of layers including a support, at least two selectively sensitized silver halide emulsion layers, each of said emulsion layers having associated therewith, a color-providing compound capable of undergoing cleavage in the presence of an imagewise distribution of silver ions and/or soluble silver complex to liberate a color-providing moiety in an imagewise distribution corresponding to said distribution of silver ions and/or said complex, one of said color-providing compound and said color-providing moiety being diffusible in aqueous alkaline solution and the other being substantially non-diffusible in aqueous alkaline solution, and a scavenger layer containing a scavenger for silver ion and/or soluble silver complex, said scavenger layer being positioned between said two selectively sensitized silver halide emulsion layers, each of said color-providing compounds being a compound containing a group selected from ##STR22## b. applying an aqueous alkaline processing composition to said photosensitive element to provide an aqueous alkaline solution of a silver halide developing agent and a silver halide solvent therein, thereby developing said photosensitive element;
- c. forming in undeveloped areas of each of said emulsions an imagewise distribution of silver ions and/or soluble silver complex;
- and
- d. contacting said imagewise distribution of silver ions and/or soluble silver complex formed in each of said emulsion with the emulsion's associated color-providing compound thereby forming corresponding imagewise distributions of each of said color-providing moieties.
Dependencies are inferred from the claim text.