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US3856520A
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Color diffusion transfer photographic elements comprising a sulfur-substituted tetrahydropyrimidine development inhibitor precursor and process for their use
Assignee: Polaroid Corp
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Filing: 1973-04-09
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Granted: 1974-12-24
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Expires: 1993-04-09
Abstract
Abstract A multicolor image is formed by a diffusion transfer process which includes exposing at least a first photosensitive silver halide layer having associated therewith a color-providing material, that is, a dye image-forming material, e.g., a dye which is a silver halide developing agent, which is diffusible in alkaline processing composition as a function of the photoexposure of the silver halide layer, applying an aqueous alkaline processing composition to effect development of said exposed silver halide layer and to provide thereby a diffusible distribution of said color-providing material as a function of the point-to-point degree of emulsion exposure, whereby at least a portion of the imagewise distribution of diffusible colorproviding material is transferred to a superposed dyeable polymeric layer. A development restrainer is made available during processing after a predetermined period by incorporating in the photographic film unit, an S-substituted pyrimidine compound of the formula (Y-S-X wherein Y is a tetrahydropyrimidine group and X is hydrogen in its active or unblocked form or a group hydrolyzable by said alkaline processing composition as a function of temperature to provide thereby controlled release of development restrainer during said development process.
Inventors
- 👤 S Bloom
- 👤 M Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:46
CPC Classifications
G; G03; G03C; G03C8/00; Y; Y10; Y10S; Y10S430/00; Y10S430/156
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
125 words
IN PROCESS FOR FORMING DIFFUSION TRANSFER IMAGES IN COLOR WHICH COMPRISES THE STEPS OF DEVELOPING AN EXPOSED PHOTOSENSITIVE ELEMENT COMPRISING A PLURALITY OF LAYERS INCLUDING A SILVER HALIDE LAYER, AT LEAST ONE OF SAID LAYERS CONTAINING A DYE IMAGE-PROVIDING MATERIAL, BY CONTACTING SAID ELEMENT WITH AN AQUEOUS ALKALINE SOLUTION, FORMING THEREBY AN IMAGEWISE DISTRIBUTION OF MOBILE DYE IMAGE-PROVIDING MATERIAL AS A FUNCTION OF THE POINT-TO-POINT DEGREE OF EXPOSURE OF SAID ELEMENT, TRANSFERRING BY IMBIBITION AT LEAST A PORTION OF SAID IMAGEWISE DISTRIBUTION OF MOBILE DYE IMAGE-PROVIDING MATERIAL TO A SUPERPOSED IMAGE-RECEIVING ELEMENT WHICH COMPRISES A DYEABLE POLYMERIC LAYER, TO PROVIDEE TO SAID DYEABLE POLYMERIC LAYER A DYE IMAGE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID PROCESS IN THE PRESENCE OF A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
125 words
IN PROCESS FOR FORMING DIFFUSION TRANSFER IMAGES IN COLOR WHICH COMPRISES THE STEPS OF DEVELOPING AN EXPOSED PHOTOSENSITIVE ELEMENT COMPRISING A PLURALITY OF LAYERS INCLUDING A SILVER HALIDE LAYER, AT LEAST ONE OF SAID LAYERS CONTAINING A DYE IMAGE-PROVIDING MATERIAL, BY CONTACTING SAID ELEMENT WITH AN AQUEOUS ALKALINE SOLUTION, FORMING THEREBY AN IMAGEWISE DISTRIBUTION OF MOBILE DYE IMAGE-PROVIDING MATERIAL AS A FUNCTION OF THE POINT-TO-POINT DEGREE OF EXPOSURE OF SAID ELEMENT, TRANSFERRING BY IMBIBITION AT LEAST A PORTION OF SAID IMAGEWISE DISTRIBUTION OF MOBILE DYE IMAGE-PROVIDING MATERIAL TO A SUPERPOSED IMAGE-RECEIVING ELEMENT WHICH COMPRISES A DYEABLE POLYMERIC LAYER, TO PROVIDEE TO SAID DYEABLE POLYMERIC LAYER A DYE IMAGE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT SAID PROCESS IN THE PRESENCE OF A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
21 words
A process as defined in claim 1 wherein said compound is selected from the group consisting of compounds of the formula:
Claim 4
Dependent Claim
156 words
A process as defined in claim 1 which comprises, in combination, the steps of exposing a photosensitive element which includes a support layer, carrying on one surface at least two selectively sensitized silver halide emulsion layers each having a dye, which dye is a silver halide developing agent, of a predetermined color associated therewith, each of said dyes being soluble and diffusible in alKali, contacting said exposed photosensitive element with an aqueous alkaline processing composition, effecting thereby development of latent images contained in each of said silver halide emulsions, immobilizing the dye associated with each of said emulsions as a result of said development, forming thereby an imagewise distribution of mobile dye as a function of the point-to-point degree of exposure thereof, transferring by imbibition at least a portion of each of said imagewise distributions of mobile dye to a superposed image-receiving element which comprises a dyeable polymeric layer to provide thereto a multicolored dye image.
Claim 5
Dependent Claim
15 words
A process as defined in claim 1 wherein said compound is represented by the formula:
Claim 6
Dependent Claim
15 words
A process as defined in claim 2 wherein R1 is methyl and R2 is hydrogen.
Claim 7
Dependent Claim
10 words
A process as defined in claim 2 wherein X is
Claim 8
Dependent Claim
14 words
A process as defined in claim 1 wherein said compound is N-lauroyl 4-methyl-3,4,5,6-tetrahydropyrimidine 2-thiol.
Claim 9
Dependent Claim
224 words
A process of forming a multicolored image by diffusion transfer comprising: a. exposing a photosensitive element comprising a support carrying in turn a layer including a red-sensitive silver halide emulsion, a layer including a green-sensitive silver halide emulsion, and a layer including a blue-sensitive silver halide emulsion; said silver halide emulsions having associated therewith, respectively, a cyan dye developer, a magenta dye developer, and a yellow dye developer; b. applying an aqueous alkaline processing solution to said photosensitive element to initiate development of exposed silver halide, said dye developers being oxidized and thereby immobilized where development occurs; c. continuing said development of exposed silver halide for a predetermined period, said predetermined development period being sufficiently long to form an imagewise distribution of diffusible unoxidized dye developer in undeveloped areas of each of said silver halide emulsion layers as a function of said development, said unoxidized dye developers being transferred by diffusion to an image-receiving layer in superposed relationship with said silver halide emulsion layers to form said multicolor image; d. said process being carried out in the presence of a compound of the formula: (Y-S --X wherein Y is a tetrahydropyrimidine group and X is selected from the group consisting of hydrogen and a group hydrolyzable in said alkaline solution, said X being bonded to said compound through the sulfur or a ring nitrogen.
Claim 10
Dependent Claim
224 words
A process of forming a multicolored image by diffusion transfer comprising: a. exposing a photosensitive element comprising a support carrying in turn a layer including a red-sensitive silver halide emulsion, a layer including a green-sensitive silver halide emulsion, and a layer including a blue-sensitive silver halide emulsion; said silver halide emulsions having associated therewith, respectively, a cyan dye developer, a magenta dye developer, and a yellow dye developer; b. applying an aqueous alkaline processing solution to said photosensitive element to initiate development of exposed silver halide, said dye developers being oxidized and thereby immobilized where development occurs; c. continuing said development of exposed silver halide for a predetermined period, said predetermined development period being sufficiently long to form an imagewise distribution of diffusible unoxidized dye developer in undeveloped areas of each of said silver halide emulsion layers as a function of said development, said unoxidized dye developers being transferred by diffusion to an image-receiving layer in superposed relationship with said silver halide emulsion layers to form said multicolor image; d. said process being carried out in the presence of a compound of the formula: (Y-S --X wherein Y is a tetrahydropyrimidine group and X is selected from the group consisting of hydrogen and a group hydrolyzable in said alkaline solution, said X being bonded to said compound through the sulfur or a ring nitrogen.
Claim 11
Dependent Claim
21 words
A process as defined in claim 8 wherein said compound is selected from the group consisting of compounds of the formula:
Claim 12
Dependent Claim
63 words
A photgraphic film unit comprising a support carrying a plurality of layers including a silver halide layer, at least one of said layers having a dye image-providing material associated therewith, said film unit including a compound of the formula: (Y-S --X wherein Y is a tetrahydropyrimidine group and X is selected from the group consisting of hydrogen and a group hydrolyzable by alkali.
Claim 13
Dependent Claim
63 words
A photgraphic film unit comprising a support carrying a plurality of layers including a silver halide layer, at least one of said layers having a dye image-providing material associated therewith, said film unit including a compound of the formula: (Y-S --X wherein Y is a tetrahydropyrimidine group and X is selected from the group consisting of hydrogen and a group hydrolyzable by alkali.
Claim 14
Dependent Claim
38 words
A product as defined in claim 10 wherein said film unit includes a support carrying on one surface at least two selectively sensitized silver halide layers, each having a dye which dye is a silver halide developing agent.
Claim 15
Dependent Claim
21 words
A product as defined in claim 10 wherein said compound is selected from the group consisting of compounds of the formula:
Claim 16
Dependent Claim
24 words
The product as defined in claim 10 which includes a diffusion transfer image-receiving element fixed to at least one edge of said photosensitive element.
Claim 17
Dependent Claim
45 words
The product as defined in claim 13 which includes a rupturable container retaining an aqueous alkaline processing composition fixed to one edge of said photosensitive and said image-receiving elements and adapted upon rupturing to distribute its contents intermediate said photosensitive element and said image-receiving element.
Claim 18
Dependent Claim
55 words
The product as defined in claim 13 wherein said photsensitive silver halide emulsion layers comprise, in sequence, a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, and a blue-sensitive silver halide emulsion layer having associated therewith, respectively, cyan, magenta and yellow dyes, each of said dyes being a silver halide developing agent.
Claim 19
Dependent Claim
31 words
The product as defined in claim 10 wherein said compound is disposed in at least one of said photosensitive silver halide emulsion layers and X is a group hydrolyzable by alkali.
Claim 20
Dependent Claim
20 words
The product as defined in claim 13 wherein said compound is disposed in said image-receiving element and X is hydrogen.
Claim 21
Dependent Claim
20 words
The product as defined in claim 11 wherein R1 is a methyl group and R2 is hydrogen and X is
Claim 22
Dependent Claim
14 words
The product as defined in claim 17 wherein said compound is N-lauroyl 4-methyl-3,4,5,6-tetrahydropyrimidine 2-thiol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |