US3619236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating layers of gelatin and a carboxyl-containing polymer on a support
Assignee: Eastman Kodak Co
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Filing: 1968-11-25
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Granted: 1971-11-09
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Expires: 1988-11-25
Abstract
Abstract A hardened coating such as a photographic emulsion, containing gelatin and a water soluble carboxyl-containing polymer, is provided on a support by first blending the gelatin with a carbodiimide or isoxazolium slat hardener and subsequently blending that mixture with the carboxyl-containing polymer to provide a coating material which hardens sufficiently slowly to provide uniform coating.
Inventors
- 👤 Glen M Dappen
- 👤 Grace E Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:22
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
A method according to claim 1 wherein said hardener is an isoxazolium salt having the formula:
Claim 2
Dependent Claim
27 words
A method according to claim 2 wherein said carbodiimide has the formula: wherein R4 and R5 are monovalent organic residues having from one to 20 carbon atoms.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein said hardener comprises a carbodiimide and wherein the mixture of carbodiimide and gelatin is held for at least 30 prior to admixture with said polymer.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein the aqueous gelatin solution includes silver halide.
Claim 5
Independent Claim
123 words
A method of providing a hardened coating of a mixture of gelatin and a water soluble synthetic polymer on a support comprising: providing an aqueous mixture comprising gelatin and 2,5-dimethylisoxazolium p-toluenesulfonate hardener; subsequently mixing a water soluble synthetic polymer containing from 90 to 10 mole percent of alkyl acrylate units, from 90 to 10 mole percent of acrylic acid units and from 0 to 40 mole percent of units derived from an ethylenically unsaturated copolymerizable monomer with the gelatin-hardener mixture; coating the mixture of geLatin, hardener, and water soluble synthetic polymer on the support whereby the setting time of said coating is substantially longer than that which would be obtained if said gelatin, hardener and polymer were simultaneously mixed; and drying the coating.
Claim 6
Independent Claim
121 words
A method of providing a hardened coating of a mixture of gelatin and a water soluble synthetic polymer on a support comprising: providing an aqueous mixture comprising gelatin and diisopropyl-carbodiimide hardener; subsequently mixing a water soluble synthetic polymer containing from 90 to 10 mole percent of alkyl acrylate units, from 90 to 10 mole percent of acrylic acid units and from 0 to 40 mole of units derived from an ethylenically unsaturated copolymerizable monomer with the gelatin-hardener mixture; coating the mixture of gelatin, hardener, and water soluble synthetic polymer on the support whereby the setting time of said coating is substantially longer than that which would be obtained if said gelatin, hardener and polymer were simultaneously mixed; and drying the coating.
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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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |