Patent US4706659A successfully refreshed from Google Patents.
US2982749A
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Inverse suspension polymerization of water soluble unsaturated monomers
Assignee: Dow Chemical Co
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Filing: 1957-07-15
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Granted: 1961-05-02
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Expires: 1977-07-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Friedrich
- 👤 Ralph M Wiley
- 👤 Walter L Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:41
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/32; Y; Y10; Y10S; Y10S524/00; Y10S524/922; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A WATER-IN-OIL SUSPENSION POLYMERIZATION METHOD FOR MAKING POLYMERS AND COPOLYMERS OF WATER-SOLUBLE ETHYLENICALLY UNSATURATED MONOMERS BY FORMING A WATERIN-OIL SUSPENSION OF AN AQUEOUS SOLUTION CONTAINING BETWEEN 5 AND 80 WEIGHT PERCENT OF AT LEAST ONE WATERSOLUBLE ETHYLENICALLY UNSATURATED MONOMER IN AN INERT HYDROPHOBIC LIQUID ORGANIC DISPERSION MEDIUM CONTAINING A SUSPENDING AGENT HAVING A LOW HYDROPHILE-LYOPHILE BALANCE, THE RATIO OF AQUEOUS MONOMER PHASE TO SAID DISPERSION MEDIUM RANGING BETWEEN 5 AND 75 WEIGHT PARTS OF SAID AQUEOUS PHASE TO 95 TO 25 PARTS OF SAID DISPERSION MEDIUM, AND HEAT-POLYMERIZING THE SUSPENDED MONOMER IN THE PRESENCE OF A CATALYTIC AMOUNT OF A POLYMERIZATION INITIATOR TO OBTAIN A DISPERSE PHASE POLYMERIC PRODUCT IN BEAD FORM.
Claim 2
Dependent Claim
112 words
A WATER-IN-OIL SUSPENSION POLYMERIZATION METHOD FOR MAKING POLYMERS AND COPOLYMERS OF WATER-SOLUBLE ETHYLENICALLY UNSATURATED MONOMERS BY FORMING A WATERIN-OIL SUSPENSION OF AN AQUEOUS SOLUTION CONTAINING BETWEEN 5 AND 80 WEIGHT PERCENT OF AT LEAST ONE WATERSOLUBLE ETHYLENICALLY UNSATURATED MONOMER IN AN INERT HYDROPHOBIC LIQUID ORGANIC DISPERSION MEDIUM CONTAINING A SUSPENDING AGENT HAVING A LOW HYDROPHILE-LYOPHILE BALANCE, THE RATIO OF AQUEOUS MONOMER PHASE TO SAID DISPERSION MEDIUM RANGING BETWEEN 5 AND 75 WEIGHT PARTS OF SAID AQUEOUS PHASE TO 95 TO 25 PARTS OF SAID DISPERSION MEDIUM, AND HEAT-POLYMERIZING THE SUSPENDED MONOMER IN THE PRESENCE OF A CATALYTIC AMOUNT OF A POLYMERIZATION INITIATOR TO OBTAIN A DISPERSE PHASE POLYMERIC PRODUCT IN BEAD FORM.
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) | 1964-05-01 | 1964-10-31 | 1965-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-01 | 1968-10-31 | 1969-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-01 | 1972-10-31 | 1973-05-02 | $7700.00 | Window Closed / Lapsed |