Diffusion transfer film units with application of processing composition between dye developer layer and silver halide emulsion layer
AssigneePolaroid Corporation
InventorWilliam J. Pflingston
Life of this patent
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Abstract
Diffusion transfer film units and a diffusion transfer process operative therein are described which are capable of providing relatively high resolution monochromatic dye developer transfer images.
Claims31
A diffusion transfer film unit comprising:
- a photosensitive element comprising a first support carrying on one surface, in order, an alkaline solution permeable image-receiving layer, a strippable layer which permits separation of said image-receiving layer and said first support, as a unitary structure, from said film unit after processing thereof, and a photosensitive silver halide emulsion layer;
- a dye developer element comprising a second support carrying at least one dye developer layer, said dye developer element and said photosensitive element superposed or adapted to be superposed with said first and second supports outermost;
- and
- a rupturable container retaining an aqueous alkaline processing composition and fixedly positioned to effect, upon rupture, discharge of said processing composition between said photosensitive element and said dye developer element.
A diffusion transfer film unit comprising:
- a photosensitive element comprising a transparent first support carrying on one surface, in order, an alkaline solution permeable image-receiving layer, a strippable layer which permits separation of said image-receiving layer and said first support, as a unitary structure, from said film unit after processing thereof, and a photosensitive silver halide emulsion layer;
- a dye developer element comprising a second support carrying at least one dye developer layer, said dye developer element and said photosensitive element adapted to be superposed subsequent to exposure of said photosensitive element with said first and second supports outermost;
- and
- a rupturable container retaining an aqueous alkaline processing composition and fixedly positioned to effect, upon rupture, discharge of said processing composition between said photosensitive element and said dye developer element as or after said elements are brought into superposition.
A process comprising the steps of exposing the silver halide of a photosensitive element comprising a first support carrying on one surface, in order, an alkaline solution permeable image-receiving layer, a strippable layer permitting separation of said image-receiving layer and said first support, as a unitary structure, from said film unit after processing thereof, and a photosensitive silver halide emulsion layer;
- distributing an aqueous alkaline processing composition between said photosensitive element and a dye developer element in superposition with said photosensitive element and comprising a second support carrying at least one dye developer layer;
- dissolving at least a portion of the dye developer in said dye developer layer in said processing composition;
- transferring at least a portion of the dissolved dye developer to said photosensitive element in an essentially uniform distribution;
- substantially immobilizing the dye developer in said uniform distribution as a function of development of said silver halide, thereby forming an imagewise distribution of diffusible dye developer;
- transferring at least a portion of said imagewise distribution of diffusible dye developer to said image-receiving layer to provide a monochromatic transfer image therein;
- and
- separating said image-receiving layer and said first support, as a unitary structure, from said film unit.
Dependencies are inferred from the claim text.