US3683046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 2-pyrrolidone with carbon dioxide as activator and particulate material for reproducible results
Assignee: Radiation Research Corp
•
Filing: 1970-09-03
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Granted: 1972-08-08
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Expires: 1990-09-03
Abstract
Abstract 2-Pyrrolidone is polymerized to a high molecular weight polymer in the presence of an alkaline polymerization catalyst, CO2, and a particulate material that was added to the reaction mass.
Inventors
- 👤 Peter A Jarovitzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
The process according to claim 1, wherein the particulate material has a particle size of from about 0.005 mm to about 2 mm.
Claim 2
Dependent Claim
30 words
The process according to claim 1, wherein said 2-pyrrolidone is admixed with the alkaline polymerization catalyst and the particulate material, and the CO2 is then bubbled through the resulting admixture.
Claim 3
Dependent Claim
99 words
A process for the polymerization of 2-pyrrolidone to form a solid polymer, which comprises admixing 2-pyrrolidone with an alkaline polymerization catalyst, carbon dioxide as a polymerization activator, and a particulate material, the particulate material being added to the admixture from a source external of the admixture, the particulate material being a partially polymerized reaction mass prepared by polymerizing 2-pyrrolidone in the presence of an alkaline polymerization catalyst and carbon dioxide as a polymerization activator, the amount of said partially polymerized reaction mass being from about 0.3 to about 10 percent by weight, based on the weight of the 2-pyrrolidone.
Claim 4
Dependent Claim
30 words
The process according to claim 4, wherein said 2-pyrrolidone is admixed with the alkaline polymerization catalyst and the particulate material, and the CO2 is then bubbled through the resulting admixture.
References Cited (Backward Citations)
US3216976A
Cited
US3419517A
Cited
US3322715A
Cited
US3391125A
Cited
US3386943A
Cited
US3418268A
Cited
US3455885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |