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US3681295A
Expired / Lapsed
US
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Polymerization of 2-pyrrolidone using n-acyl compounds as co-activators with carbon dioxide as activator
Assignee: Radiation Research Corp
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Filing: 1970-09-03
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Granted: 1972-08-01
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Expires: 1990-09-03
Abstract
Abstract AN IMPROVED PROCESS FOR THE POLYMERIZATION OF 2PYRROLIDONE TO PROVIDE HIGH MOLECULAR WEIGHTS AND HIGH RATES OF CONVERSIN COMPRISING POLYMERIZING 2-PYRROLIDONE IN THE PRESENCE OF AN ALKALINE POLYMERIZATION CATALYST, CARBON DIOXIDE, AND NOT MORE THAN 7 MILLIMOLS OF AN ACYL COMPOUND PER MOL OF THE ALKALINE POLYMERIZATION CATALYST. THE ACYL COMPOUND CAN CONVENIENTLY BE ANY OF THE ACYL COMPOUNDS PREVIOUSLY DISCLOSED AS POLYMERIZATION ACTIVATORS IN THE POLYMERIZATION OF 2-PYRROLIDONE.
Inventors
- 👤 Peter A Jarovitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:46
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |