US3211706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of linear polyamides of beta-aminocarboxylic acids
Assignee: Hoechst AG
•
Filing: 1960-12-02
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Granted: 1965-10-12
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Expires: 1980-12-02
Abstract
No abstract record available.
Inventors
- 👤 Borner Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:11
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR THE MANUFACTURE OF LINEAR POLYAMIDES OF BETA-AMINO-CARBOXYLIC ACIDS, WHICH COMPRISES POLYMERIZING IN DIMETHYL SULFOXIDE BETA-LACTAMS WHICH ARE UNSUBSTITUTED AT THE NITROGEN ATOM AND CARRY AT LEAST ONE HYDROGEN ATOM IN ALPHA-POSITION TO THE CARBONYL GROUP, IN THE PRESENCE OF 0.001 TO 0.02 MOL OF AT LEAST ONE ALKALI METAL LACTAMATE AND 0.00005 TO 0.0006 MOL OF AN N-ACYL DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE ACETYL AND BENZOYL DERIVATIVE OF A LACTAM CONTAINING 3 TO 8 CARBON ATOMS IN THE LACTAM RING, AT A TEMPERATURE WITHIN THE RANGE OF 15-25*C., THE RESULTING POLYAMIDE HAVING A RELATIVE VIXCOSITY OF AT LEAST 7.0 MEASURED AS A 1% BY WEIGHT SOLUTION IN CONCENTRATED SULFURIC ACID AT 20*C.
Claim 2
Dependent Claim
118 words
A PROCESS FOR THE MANUFACTURE OF LINEAR POLYAMIDES OF BETA-AMINO-CARBOXYLIC ACIDS, WHICH COMPRISES POLYMERIZING IN DIMETHYL SULFOXIDE BETA-LACTAMS WHICH ARE UNSUBSTITUTED AT THE NITROGEN ATOM AND CARRY AT LEAST ONE HYDROGEN ATOM IN ALPHA-POSITION TO THE CARBONYL GROUP, IN THE PRESENCE OF 0.001 TO 0.02 MOL OF AT LEAST ONE ALKALI METAL LACTAMATE AND 0.00005 TO 0.0006 MOL OF AN N-ACYL DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE ACETYL AND BENZOYL DERIVATIVE OF A LACTAM CONTAINING 3 TO 8 CARBON ATOMS IN THE LACTAM RING, AT A TEMPERATURE WITHIN THE RANGE OF 15-25*C., THE RESULTING POLYAMIDE HAVING A RELATIVE VIXCOSITY OF AT LEAST 7.0 MEASURED AS A 1% BY WEIGHT SOLUTION IN CONCENTRATED SULFURIC ACID AT 20*C.
References Cited (Backward Citations)
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US2691643A
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US2739959A
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US2957852A
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US3037001A
Cited
US3093618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |