Patent US4242247A successfully refreshed from Google Patents.
US4242247A
Expired / Lapsed
US
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Process for water-in-oil emulsions of water-soluble polymers
Assignee: Wyeth Holdings LLC
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Filing: 1979-08-27
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Granted: 1980-12-30
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Expires: 1999-08-27
Abstract
Abstract Reduced coagulum is obtained when water-soluble monomers are polymerized in the dispersed phase of a water-in-oil emulsion and added salt is present in the aqueous monomer phase.
Inventors
- 👤 Joseph J. Pellon
- 👤 Paul D. Savoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:01
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for preparing a water-soluble polymer or copolymer of nonionic or anionic character which comprises preparing an aqueous solution of at least one water-soluble monomer, said aqueous solution containing dissolved therein from about 2 weight percent up to the solubility limit in water of a water-soluble, oil-insoluble added salt selected from the group consisting of sodium sulfate, sodium chloride, ammonium chloride, ammonium sulfate and sodium acetate, emulsifying the resulting monomer solution in a water-insoluble hydrocarbon oil to form a water-in-oil emulsion, and polymerizing said monomer in the dispersed phase to form the desired polymer.
Claim 2
Dependent Claim
95 words
A process for preparing a water-soluble polymer or copolymer of nonionic or anionic character which comprises preparing an aqueous solution of at least one water-soluble monomer, said aqueous solution containing dissolved therein from about 2 weight percent up to the solubility limit in water of a water-soluble, oil-insoluble added salt selected from the group consisting of sodium sulfate, sodium chloride, ammonium chloride, ammonium sulfate and sodium acetate, emulsifying the resulting monomer solution in a water-insoluble hydrocarbon oil to form a water-in-oil emulsion, and polymerizing said monomer in the dispersed phase to form the desired polymer.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said monomer olution contains acrylamide.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein said monomer solution contains acrylamide and acrylic acid.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said salt is Na 2 SO 4 .
Claim 6
Dependent Claim
20 words
The process of claim 3 wherein said monomer solution contains 97 weight percent acrylamide and 3 weight percent acrylic acid.
Claim 7
Dependent Claim
20 words
The process of claim 3 wherein said monomer solution contains 70 weight percent acrylamide and 30 weight percent acrylic acid.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein said preparation is repeated in the same reactor without intermediate cleaning thereof.
Claim 9
Dependent Claim
14 words
The process of claim 5 wherein said salt is Na 2 SO 4 .
Claim 10
Dependent Claim
14 words
The process of claim 6 wherein said salt is Na 2 SO 4 .
Claim 11
Dependent Claim
14 words
The process of claim 7 wherein said salt is Na 2 SO 4 .
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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |