US4015990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic lightsensitive material
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1975-06-19
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Granted: 1977-04-05
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Expires: 1995-06-19
Abstract
Abstract A tocopherol derivative represented by the general formula, <IMAGE> (I) wherein R, R1 and R2 represent individually a hydrogen atom or a methyl group; and R3 represents a straight chain or branched-chain alkyl group having 1 to 18 carbon atoms, or a substituted or unsubstituted aryl group, is incorporated as a light-fading stabilizer into the photosensitive layer of a color photographic lightsensitive material, whereby the photographic material can be prevented not only from fading and discoloration of the finally obtained color image and from discoloration of the non-color-developed portion, but also from formation of fog. Furthermore, the said stabilizer itself is excellent in dispersion stability.
Inventors
- 👤 Yaichi Ishida
- 👤 Hiroshi Ikeda
- 👤 Shigetoshi Hiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:59
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/3924; G03C7/39268
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
In a color photographic lightsensitive material comprising a support and, coated thereon, a coupler-dispersed silver halide emulsion, the improvement in that the said emulsion contains as a light-fading stabilizer at least one tocopherol derivative having the general formula, ##STR4## wherein R, R 1 and R 2 represent individually a hydrogen atom or a methyl group; and R 3 represents a straight chain or branched-chain alkyl group having 1 to 18 carbon atoms, or a methyl substituted or unsubstituted aryl group.
Claim 2
Dependent Claim
80 words
In a color photographic lightsensitive material comprising a support and, coated thereon, a coupler-dispersed silver halide emulsion, the improvement in that the said emulsion contains as a light-fading stabilizer at least one tocopherol derivative having the general formula, ##STR4## wherein R, R 1 and R 2 represent individually a hydrogen atom or a methyl group; and R 3 represents a straight chain or branched-chain alkyl group having 1 to 18 carbon atoms, or a methyl substituted or unsubstituted aryl group.
Claim 3
Dependent Claim
31 words
A color photographic lightsensitive material as claimed in claim 1, wherein the amount of the said tocopherol derivative is 5 to 200 weight %, based on the weight of the coupler.
Claim 4
Dependent Claim
16 words
A color photographic lightsensitive material as claimed in claim 1, which additionally contains an ultraviolet absorber.
Claim 5
Dependent Claim
16 words
A color photographic lightsensitive material as claimed in claim 1, which additionally contains other fading-preventing agent.
Claim 6
Dependent Claim
23 words
A color photographic lightsensitive material as claimed in claim 1, wherein the light-fading stabilizer is selected from the following group: ##STR5## ##STR6## ##STR7##
Claim 7
Dependent Claim
23 words
A color photographic lightsensitive material as claimed in claim 1 wherein the amount of said tocopherol derivative is 30 to 150 weight %.
Claim 8
Dependent Claim
23 words
A color photographic lightsensitive material as claimed in claim 1 which additional contains a benzophenone, benzotriazole, thiazolidone, oxazole or imidazole type ultraviolet absorber.
Claim 9
Dependent Claim
50 words
A color photographic lightsensitive material as claimed in claim 1 which additionally contains another fading-preventing agent from the group consisting of the phenol type, the hydroquinone type, the chroman type, the coumaran type, the organic phosphorus type, the amine type, the thiodipropionate type and the piperidine type of fading-preventing agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |