US3770689A
Expired / Lapsed
US
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Process for the anionic catalytic polymerization of lactams
Assignee: Stamicarbon BV
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Filing: 1971-01-21
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Granted: 1973-11-06
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Expires: 1991-01-21
Abstract
Abstract AN IMPROVED PROCESS FOR THE ANIONIC, CATALYTIC POLYMERIZATION OF LACTAMS WITH THE AID OF ONE OR MORE PROMOTERS IS DISCLOSED WHEREBY A POLYAMIDE POLYMER HAVING IMPROVED IMPACT RESISTANCE IS PRODUCED. THE POLYMERIZATION IS CARRIED OUT IN THE PRESENCE OF A POLYETHER WITH ETHERIFIED OH GROUPS AND WHICH IS SOLUBLE IN THE MOLTEN LACATAM REACTION MIXTURE.
Inventors
- 👤 Der Loos J Van
- 👤 P Claassen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:01
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08L; C08L77/00; C08L77/02
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |