Patent US3154525A successfully refreshed from Google Patents.
US3154525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perhalogenated ketones as activators for the anionic polymerization of caprolactam
Assignee: EIDP Inc
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Filing: 1961-07-31
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Granted: 1964-10-27
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Expires: 1981-07-31
Abstract
No abstract record available.
Inventors
- 👤 Kohan Melvin Ira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:41
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE RAPID POLYMERIZATION OF CAPROLACTAM TO SOLID POLYAPROLACTAM WHICH COMPRISES HEATING AT A TEMPERATURE OF FROM 100 TO 200*C. A REACTION MIXTURE OF CAPROLACTAM, AN ANIONIC CATALYST CONSISTING OF AN IMINIUM SALT OF CAPROLACTAM, AND A CO-CATALYST COMPRISING A PERHALOGENATED KETONE SELECTED FROM THE GROUP CONSISTING OF PERHALOGENATED ALKANONES HAVING FROM 2 TO 20 CARBON ATOMS, IN ADDITION TO THE CARBON ATOM OF THE CARBONYL GROUP AND PERHALOGENATED CYCLOALKANONES CONTAINING FROM 3 TO 10 CARBON ATOMS IN THE RING, IN ADDITION TO THE CARBON ATOM OF THE CARBONYL GROUP.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE RAPID POLYMERIZATION OF CAPROLACTAM TO SOLID POLYAPROLACTAM WHICH COMPRISES HEATING AT A TEMPERATURE OF FROM 100 TO 200*C. A REACTION MIXTURE OF CAPROLACTAM, AN ANIONIC CATALYST CONSISTING OF AN IMINIUM SALT OF CAPROLACTAM, AND A CO-CATALYST COMPRISING A PERHALOGENATED KETONE SELECTED FROM THE GROUP CONSISTING OF PERHALOGENATED ALKANONES HAVING FROM 2 TO 20 CARBON ATOMS, IN ADDITION TO THE CARBON ATOM OF THE CARBONYL GROUP AND PERHALOGENATED CYCLOALKANONES CONTAINING FROM 3 TO 10 CARBON ATOMS IN THE RING, IN ADDITION TO THE CARBON ATOM OF THE CARBONYL GROUP.
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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |