US3835100A
Expired / Lapsed
US
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Method for anionic polymerization of alpha-pyrrolidone or alpha-piperidone with quaternary ammonium salts
Assignee: Bpifrance Financement SA
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Filing: 1972-02-14
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Granted: 1974-09-10
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Expires: 1992-02-14
Abstract
Abstract THE INVENTION PROPOSES NEW CATALYST CONSISTING OF QUATERNNARY AMMONIUM SALTS OF LACTAMS OR ETHER ORGANIC COMPOUNDS HAVING ONE OR MORE HYDROGEN ATOMS OF ACIDIC NATURE AND HAVING PK VALUES RANGING FROM ABOUT 14 TO ABOUT 30, WHICH CATALYSTS ARE OBTAINED BY REACTING QUATERNARY AMMONIUM ALKOXIDES WITH CORRESPONDING LACTAMS OR WEAK ACIDS, AS WELL AS A NEW PROCESS FOR POLYMERIZING OMEGA-LACTAMS, IN PARTICULAR ALPHA-PYRROLIDONE AND ALPHAPIPERIDONE, IN PRESENCE OF THE ABOVE CATALYSTS.
Inventors
- 👤 H Sekiguchi
- 👤 P Rapacoulia
- 👤 B Coutin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:03
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D209/00; C07D209/56; C07D209/80; C07D209/82; C07D209/86; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D211/76; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |