US3775129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic gelatino silver halide emulsion
Assignee: Ilford Imaging UK Ltd
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Filing: 1972-04-04
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Granted: 1973-11-27
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Expires: 1992-04-04
Abstract
Abstract This invention relates to new photographic material and a process for the production of said material. The material is produced by coating on a support an aqueous silver halide emulsion which, in addition to gelatin, comprises a copolymer latex derived from I a monomer of the alkyl acrylate type and II a monomer which is a hydroxy substituted alkyl acrylate or methacrylate. With the composition of this invention the difficulties caused by the presence of, e.g., salts of divalent metals an substantially eliminated.
Inventors
- 👤 G Dodwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:07
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/06; G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/043; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/128
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
A photographic material according to claim 1 which comprises on the side distal to silver halide emulsion layer composed as defined in claim 1 an antihalation layer the binder of which comprises gelatin and a synthetic polymeric material.
Claim 2
Dependent Claim
98 words
A silver halide photographic emulsion of which the binder medium comprises both gelatin and a latex of a copolymer derived from I. a monomer which is an alkyl acrylate or an alkyl methacrylate or a monomer mixture comprising both an alkyl acrylate and an alkyl methacrylate or a monomer mixture comprising either one of the said monomers or the said monomer mixture together with a second ethylenically unsaturated monomer, the monomer or monomers being compounds which when homopolymerised yield water insoluble polymers and II. a monomer which is an hydroxy-substituted alkyl acrylate or methacrylate of the general formula
Claim 3
Dependent Claim
122 words
A process for the production of photographic material of the composition given in claim 1, which process comprises coating on to a support base an aqueous gelatino silver halide emulsion, the binder of which comprises both gelatin and a latex of a copolymer derived from: I. a monomer which is an alkyl acrylate or an alkyl methacrylate or a monomer mixture comprising both an alkyl acrylate and an alkyl methacrylate or a monomer mixture comprising either one of the said monomers or the said monomer mixture together with a second ethylenically unsaturated monomer, the monomer or monomers being compounds which when homopolymerised yield water insoluble polymers and II. a monomer which is an hydroxy-substituted alkyl acrylate or methacrylate of the general formula
Claim 4
Dependent Claim
12 words
A process according to claim 4 wherein monomer I is butyl acrylate.
Claim 5
Dependent Claim
11 words
A process according to claim 4 wherein monomer II is 2-hydroxypropylmethacrylate.
Claim 6
Dependent Claim
24 words
A process according to claim 4 wherein the proportion of monomer II in the monomer mixture is from 20 to 30 percent by weight.
Claim 7
Dependent Claim
51 words
A process according to claim 4 wherein there is present in the aqueous gelatino silver halide emulsion coated on the support about 1 percent by weight of the total of I and II combined of a cross-linking agent of the type which is able to cross-link acrylate or methacrylate polymer chains.
Claim 8
Dependent Claim
14 words
A process according to claim 8 wherein the cross-linking agent is ethylene glycol dimethacrylate.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |