US4250252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive color photographic material
Assignee: Agfa Gevaert AG
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Filing: 1975-10-03
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Granted: 1981-02-10
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Expires: 1995-10-03
Abstract
Abstract In a color photographic material wherein by color development there are produced either non-diffusing image dyes or diffusing image dyes (the latter being transferred to an image-receiving layer) the color development is controlled by means of non-diffusing thioether compounds which on color development release a diffusing mercapto compound but do not themselves form a dye. The mercapto compound inhibits the development of the silver halide and the thioether compound has the formula ##STR1## R 1 =hydrogen or alkyl with 1-3 carbon atoms R 2 =alkyl with up to 22 carbon atoms the group --S--Y is split off during color development and forms a mercaptane, e.g. 5-mercapto-1-phenyltetrazole, which inhibits the development.
Inventors
- 👤 Heinrich Odenwalder
- 👤 Hans Vetter
- 👤 Walter Puschel
- 👤 Erwin Ranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C07C; C07C309/00; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
In a color photographic material containing in at least one of its lightsensitive silver halide emulsion layers or a non lightsensitive binder layer associated with one of said lightsensitive silver halide emulsion layers, a non-diffusing thioether compound capable of releasing on reaction with the oxidation product of a color developer compound a diffusing mercapto compound which inhibits the further development of the silver halide, wherein the improvement comprises the thioether compound corresponds to the following formula ##STR28## wherein Y represents a non-coupling radical selected from the group consisting of an aliphatic radical, an aromatic radical and a heterocyclic radical, splittable together with the sulfur atom of the thioether bridge to form a diffusible mercapto compound capable of inhibiting silver halide development, R 1 represents hydrogen or an alkyl group having 1-3 carbon atoms, and R 2 represents an alkyl group having up to 22 carbon atoms including a photographic inert group providing resistance to diffusion, or an aralkyl group or an aryl group carrying a photographic inert group providing resistance to diffusion.
Claim 2
Dependent Claim
172 words
In a color photographic material containing in at least one of its lightsensitive silver halide emulsion layers or a non lightsensitive binder layer associated with one of said lightsensitive silver halide emulsion layers, a non-diffusing thioether compound capable of releasing on reaction with the oxidation product of a color developer compound a diffusing mercapto compound which inhibits the further development of the silver halide, wherein the improvement comprises the thioether compound corresponds to the following formula ##STR28## wherein Y represents a non-coupling radical selected from the group consisting of an aliphatic radical, an aromatic radical and a heterocyclic radical, splittable together with the sulfur atom of the thioether bridge to form a diffusible mercapto compound capable of inhibiting silver halide development, R 1 represents hydrogen or an alkyl group having 1-3 carbon atoms, and R 2 represents an alkyl group having up to 22 carbon atoms including a photographic inert group providing resistance to diffusion, or an aralkyl group or an aryl group carrying a photographic inert group providing resistance to diffusion.
Claim 3
Dependent Claim
244 words
A material as claimed in claim 1 comprising separated by non-lightsensitive binder layers, at least a red-sensitive silver halide emulsion layer, a green sensitive silver halide emulsion layer and a blude sensitive silver halide emulsion layer and containing associated with each of said red sensitive, green sensitive and blue sensitive silver halide emulsion layers a non-diffusing coupler or dye-giving compound which on color development yields a non-diffusing or diffusing image dye of a color which is essentially complementary of the sensitivity of the associated silver halide layer, which material contains in at least one of its lightsensitive silver halide emulsion layers or non-lightsensitive binder layers a non-diffusing thioether compound capable of releasing on reaction with the oxidation product of a color developer compound a diffusing mercapto compound which inhibits the further development of the silver halide, wherein the improvement comprises the thioether compound corresponds to the following formula ##STR29## wherein Y represents a non-coupling radical selected from the group consisting of an aliphatic radical, an aromatic radical and a heterocyclic radical, splittable together with the sulfur atom of the thioether bridge to form a diffusible mercapto compound capable of inhibiting silver halide development, R 1 represents hydrogen or an alkyl group having 1-3 carbon atoms, and R 2 represents an alkyl group having up to 22 carbon atoms including a photographic inert group providing resistance to diffusion, or an aralkyl group or an aryl group carrying a photographic inert group providing resistance to diffusion.
Claim 4
Dependent Claim
43 words
A material as claimed in claim 2 which contains said non-diffusing thioether compound in the red sensitive silver halide emulsion layer and/or the green sensitive silver halide emulsion layer and/or a non-light sensitive binder layer between said red sensitive and green sensitive layers.
Claim 5
Dependent Claim
20 words
A material as claimed in claim 1, in which in the formula of claim 1 Y represents an 1-aryl-tetrazole radical.
Claim 6
Dependent Claim
29 words
A material as claimed in claim 1, in which in the formula of claim 1 the group ##STR30## is attached to the 5- or 6-position of the indanone group.
References Cited (Backward Citations)
US2353205A
Cited
US2364675A
Cited
US2435629A
Cited
US3844795A
Cited
US3936300A
Cited
DE2359295A1
Cited
US3932185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |