2-Substituted benzimidazoles in multicolor diffusion transfer
AssigneePolaroid Corporation
InventorsRonald F. Lambert, Howard G. Rogers
Life of this patent
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Abstract
This application is concerned with dye developer diffusion transfer color processes and discloses the incorporation of certain 2-substituted benzimidazoles, e.g., 2-phenyl-benzimidazole, in a dye developer photosensitive element to provide improved temperature latitude.
Claims26
A diffusion transfer color process comprising exposing a photosensitive element comprising a blue-sensitive silver halide emulsion having a yellow dye developer associated therewith, a greensensitive silver halide emulsion having a magenta dye developer associated therewith, and a red-sensitive silver halide emulsion having a cyan dye developer associated therewith, applying an aqueous alkaline processing composition to said exposed photosensitive element to effect development and to form an imagewise distribution of unoxidized dye developer in undeveloped areas of each of said silver halide emulsions as a function of said development, said process including the step of transferring by diffusion at least a portion of said imagewise distributions of unoxidized dye developer to an image-receiving layer in superposed relationship therewith to thereby provide a multicolor diffusion transfer image, at least one of said silver halide emulsions having associated therewith in the same layer or in an adjacent layer a 2-substituted benzimidazole selected from the group consisting of 2-phenyl-benzimidazole, 2-.beta.-naphthyl-benzimidazole, 2-p-tolyl-benzimidazole, 2-(2'-chlorophenyl)-benzimidazole and 2-(2'-thienyl)-benzimidazole, said 2-substituted benzimidazole being present in a quantity effective to provide improved temperature latitude.
A photographic product for use in forming a diffusion transfer image in color comprising a photosensitive element comprising a support carrying a blue-sensitive silver halide emulsion having a yellow dye developer associated therewith, a green-sensitive silver halide emulsion having a magenta dye developer associated therewith, and a red-sensitive silver halide emulsion having a cyan dye developer associated therewith;
- a second, sheet-like element positioned in superposed or superposable relationship with said photosensitive element;
- an image-receiving layer positioned in one of said elements;
- a rupturable container releasably holding an aqueous alkaline processing composition adapted, when distributed between a pair of predetermined layers carried by said photosensitive element and said second element, to develop said silver halide emulsions and provide a diffusion transfer image in color on said image-receiving layer;
- at least one of said silver halide emulsions having associated therewith in the same layer or in an adjacent layer a 2-substituted benzimidazole selected from the group consisting of 2-phenyl-benzimidazole, 2-.beta.-naphthyl-benzimidazole, 2-p-tolyl-benzimidazole, 2-(2'-chlorophenyl)-benzimidazole and 2-(2'-thienyl)-benzimidazole, said 2-substituted benzimidazole being present in a quantity effective to provide improved temperature latitude.
A photographic product for use in forming a diffusion transfer image in color comprising a photosensitive element comprising a support carrying at least one light-sensitive silver halide emulsion, each said silver halide emulsion having a dye developer associated therewith;
- at least one said silver halide emulsion(s) having associated therewith in the same layer or in an adjacent layer a 2-substituted benzimidazole selected from the group consisting of 2-substituted benzimidazole selected from the group consisting of 2-phenyl-benzimidazole, 2-.beta.-naphthyl-benzimidazole, 2-p-tolyl-benzimidazole, 2-(2'-chlorophenyl)-benzimidazole and 2-(2'-thienyl)-benzimidazole, said 2-substituted benzimidazole being present in a quantity effective to provide improved temperature latitude.
Dependencies are inferred from the claim text.