US3713833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silver salts in an organic liquid medium
Assignee: Eastman Kodak Co
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Filing: 1970-10-28
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Granted: 1973-01-30
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Expires: 1990-10-28
Abstract
Abstract Photographic silver halide salt compositions are formed in the presence of certain synthetic polymers in an organic solvent medium. In one aspect, silver halide grains having metal ions occluded therein can be made by this technique. In another aspect, inorganic silver halide slats made by this technique can be admixed with organic silver salts in an organic solvent and coated on a support to provide improved heat-developable photographic elements.
Inventors
- 👤 R Lindholm
- 👤 K Hollister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F28/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
In a process of forming silver halide salt crystals in an organic solvent having a boiling point below 165* C, the improvement comprising forming said crystals in said organic solvent in the presence of a synthetic polymeric compound which is a vinyl copolymer comprising (1) recurring units having groups appended thereto which contain thioether moieties or sulfide-sulfur atoms therein and (2) recurring units of an alkyl acrylate.
Claim 2
Dependent Claim
67 words
In a process of forming silver halide salt crystals in an organic solvent having a boiling point below 165* C, the improvement comprising forming said crystals in said organic solvent in the presence of a synthetic polymeric compound which is a vinyl copolymer comprising (1) recurring units having groups appended thereto which contain thioether moieties or sulfide-sulfur atoms therein and (2) recurring units of an alkyl acrylate.
Claim 3
Dependent Claim
33 words
A process according to claim 1 wherein said copolymer comprises from about 5 to about 50 mole percent of said recurring units having groups appended thereto which contain thioether or sulfide-sulfur atoms therein.
Claim 4
Dependent Claim
25 words
A process according to claim 1 wherein said copolymer is characterized as being at least 3 percent, by weight, soluble in acetone at 25* C.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein said silver salt crystals are formed in the presence of polyvalent metal ions.
Claim 6
Dependent Claim
21 words
A process according to claim 1 wherein said silver salts are formed in the presence of trivalent or tetravalent metal ions.
Claim 7
Dependent Claim
74 words
A photographic element comprising (1) a support and (2) at least one layer thereon comprising an organic silver salt in admixture with an inorganic silver halide salt which has been formed in an organic solvent having a boiling point below 165* C in the presence of a synthetic vinyl copolymer comprising (a) recurring units having groups appended thereto which contain thioether moieties or sulfide-sulfur atoms therein and (b) recurring units of an alkyl acrylate.
Claim 8
Dependent Claim
74 words
A photographic element comprising (1) a support and (2) at least one layer thereon comprising an organic silver salt in admixture with an inorganic silver halide salt which has been formed in an organic solvent having a boiling point below 165* C in the presence of a synthetic vinyl copolymer comprising (a) recurring units having groups appended thereto which contain thioether moieties or sulfide-sulfur atoms therein and (b) recurring units of an alkyl acrylate.
Claim 9
Dependent Claim
41 words
A photographic element according to claim 6 wherein said synthetic vinyl copolymer is at least 3%, by weight, soluble in acetone and less than 3%, by weight, soluble in water at 25* C. at a pH number less than about 5.
Claim 10
Dependent Claim
18 words
A photographic element according to claim 6 wherein said synthetic vinyl copolymer is copoly(3-thiapentyl acrylate - ethyl acrylate).
References Cited (Backward Citations)
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US3003879A
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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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |