Patent US3938995A successfully refreshed from Google Patents.
US3938995A
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Silver halide color photographic element and process containing leuco dyes
Assignee: Eastman Kodak Co
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Filing: 1974-07-10
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Granted: 1976-02-17
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Expires: 1994-07-10
Abstract
Abstract Color photographic elements, compositions and processes for producing color negative images are described which employ a leuco dye comprising the reaction product of a color forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring. The leuco dye is stable against aerial oxidation and can be developed to its corresponding dye with certain black and white developing compositions.
Inventors
- 👤 Thomas Edward Gompf
- 👤 William Henry Faul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:18
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A color photosensitive element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye represented by the following general formula: ##SPC7## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during development; R 1 and R 2 -- each represent an alkyl group of one to six carbon atoms; and X -- is selected from the group consisting of --CF 3 , --SO 2 C 6 H 5 , and --CONH 2 .
Claim 2
Dependent Claim
93 words
A color photosensitive element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye represented by the following general formula: ##SPC7## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during development; R 1 and R 2 -- each represent an alkyl group of one to six carbon atoms; and X -- is selected from the group consisting of --CF 3 , --SO 2 C 6 H 5 , and --CONH 2 .
Claim 3
Dependent Claim
15 words
The color photosensitive element of claim 1, wherein the stabilized ballasted leuco dye is ##SPC8##
Claim 4
Dependent Claim
15 words
The color photosensitive element of claim 1 wherein the stabilized ballasted leuco dye is ##SPC9##
Claim 5
Dependent Claim
15 words
The color photosensitive element of claim 1 wherein the stabilized ballasted leuco dye is ##SPC10##
Claim 6
Independent Claim
127 words
A method of forming a negative color image which comprises: 1. concurrently developing a silver and a dye image in the imagewise exposed areas of a photosensitive photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye which comprises the reaction product of a cyan color-forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring, said electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation; and 2. removing developed silver and residual silver halide to leave a cyan dye image in the imagewise exposed areas of said layer without oxidizing the leuco dye molecules in the non-exposed areas of said layer.
Claim 7
Independent Claim
127 words
A method of forming a negative color image which comprises: 1. concurrently developing a silver and a dye image in the imagewise exposed areas of a photosensitive photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye which comprises the reaction product of a cyan color-forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring, said electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation; and 2. removing developed silver and residual silver halide to leave a cyan dye image in the imagewise exposed areas of said layer without oxidizing the leuco dye molecules in the non-exposed areas of said layer.
Claim 8
Dependent Claim
85 words
The method of claim 5 wherein the stabilized ballasted leuco dye is of the formula: ##SPC11## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during storage and development R 1 and R 2 -- each represent a lower alkyl group or a substituted lower alkyl group; and X -- represents at least one electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation.
Claim 9
Dependent Claim
64 words
The method of claim 5 wherein the stabilized ballasted leuco dye is of the formula: ##SPC12## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during storage and development; and X -- is selected from the group consisting of --CF 3 , --SO 2 C 6 H 5 , and --CONH 2 .
Claim 10
Dependent Claim
16 words
The method of claim 5 wherein the stabilized ballasted leuco dye is of the formula: ##SPC13##
Claim 11
Dependent Claim
16 words
The method of claim 5 wherein the stabilized ballasted leuco dye is of the formula: ##SPC14##
Claim 12
Dependent Claim
16 words
The method of claim 5 wherein the stabilized ballasted leuco dye is of the formula: ##SPC15##
Claim 13
Independent Claim
139 words
A method of forming a negative color image which comprises: 1. forming a silver and dye image in the imagewise exposed areas of a photosensitive photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye which comprises the reaction product of a cyan color-forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring, said electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation by contacting said exposed element with a developing composition containing a developing agent selected from the group consisting of 1-phenyl-3-pyrazolidone, 4-phenyl-4,4-dimethyl-3-pyrazolidone and 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone; and 2. removing developed silver and residual silver halide with a bleach-fix solution to leave a cyan dye image in the imagewise exposed areas of said layer.
Claim 14
Independent Claim
139 words
A method of forming a negative color image which comprises: 1. forming a silver and dye image in the imagewise exposed areas of a photosensitive photographic element comprising a support having thereon at least one photosensitive silver halide emulsion layer containing a stabilized ballasted leuco dye which comprises the reaction product of a cyan color-forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring, said electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation by contacting said exposed element with a developing composition containing a developing agent selected from the group consisting of 1-phenyl-3-pyrazolidone, 4-phenyl-4,4-dimethyl-3-pyrazolidone and 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone; and 2. removing developed silver and residual silver halide with a bleach-fix solution to leave a cyan dye image in the imagewise exposed areas of said layer.
Claim 15
Dependent Claim
85 words
The method of claim 11 wherein the stabilized ballasted leuco dye is of the formula: ##SPC16## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during storage and development R 1 and R 2 -- each represent a lower alkyl group or a substituted lower alkyl group; and X -- represents at least one electronegative group having the capability of deactivating the p-phenylenediamine group sufficiently to stabilize the leuco dye molecule against aerial oxidation.
Claim 16
Dependent Claim
64 words
The method of claim 11 wherein the stabilized ballasted leuco dye is of the formula: ##SPC17## where Ballast -- represents an organic radical of such molecular size and configuration as to render said leuco dye nondiffusible during storage and development; and X -- is selected from the group consisting of --CF 3 , --SO 2 C 6 H 5 , and --CONH 2 .
Claim 17
Dependent Claim
16 words
The method of claim 11 wherein the stabilized ballasted leuco dye is of the formula: ##SPC18##
Claim 18
Dependent Claim
16 words
The method of claim 11 wherein the stabilized ballasted leuco dye is of the formula: ##SPC19##
Claim 19
Dependent Claim
16 words
The method of claim 11 wherein the stabilized ballasted leuco dye is of the formula: ##SPC20##
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US3185567A
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US3342597A
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |