US3317482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polylaurolactam
Assignee: BASF SE
•
Filing: 1964-10-22
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Granted: 1967-05-02
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Kunde Joachim
- 👤 Wilhelm Hans
- 👤 Doerfel Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:42
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR THE MANUFACTURE OF POLYAUROLACTAM BY POLYCONDENSATION OF LAUROLACTAM AT ELEVATED TEMPERATURES WHICH COMPRISES HEATING A MIXTURE OF LAUROLACTAM AND 20-60 MOL PERCENT OF WATER FOR 1-6 HOURS, AT 305330*C. AT AUTOGENEOUS PRESSURE TO PRODUCE LOW MOLECULAR WEIGHT POLYLAUROLACTAM, THENSLOWLY RELEASING THE PRESSURE TO ATMOSPHERIC PRESSURE WHILE HEATING THE POLYLAUROLACTAM AND REMOVING THE WATER OF SAID MIXTURE DURING THE RELEASE OF PRESSURE, AND THEN HEATING THE RESULTANT PRODUCT FOR 0.2 TO 5 HOURS UNDER NITROGEN AT 280-330*C. TO PRODUCE POLYLAUROLACTAM HAVING A K-VALUE, AS MEASURED AS 1 GRAM OF POLYLAUROLACTAM DISSOLVED IN 100 ML. OF 96% SULFURIC ACID ACCORDING TO FIKENTSCHER, CELLULOSECHEMIE, 12, 58 (1932), IN THE RANGE OF 40 TO 60 AND A METHANOL-EXTRACTABLE FRACTION OF LESS THAN 1.2% BY WEIGHT.
Claim 2
Dependent Claim
124 words
A PROCESS FOR THE MANUFACTURE OF POLYAUROLACTAM BY POLYCONDENSATION OF LAUROLACTAM AT ELEVATED TEMPERATURES WHICH COMPRISES HEATING A MIXTURE OF LAUROLACTAM AND 20-60 MOL PERCENT OF WATER FOR 1-6 HOURS, AT 305330*C. AT AUTOGENEOUS PRESSURE TO PRODUCE LOW MOLECULAR WEIGHT POLYLAUROLACTAM, THENSLOWLY RELEASING THE PRESSURE TO ATMOSPHERIC PRESSURE WHILE HEATING THE POLYLAUROLACTAM AND REMOVING THE WATER OF SAID MIXTURE DURING THE RELEASE OF PRESSURE, AND THEN HEATING THE RESULTANT PRODUCT FOR 0.2 TO 5 HOURS UNDER NITROGEN AT 280-330*C. TO PRODUCE POLYLAUROLACTAM HAVING A K-VALUE, AS MEASURED AS 1 GRAM OF POLYLAUROLACTAM DISSOLVED IN 100 ML. OF 96% SULFURIC ACID ACCORDING TO FIKENTSCHER, CELLULOSECHEMIE, 12, 58 (1932), IN THE RANGE OF 40 TO 60 AND A METHANOL-EXTRACTABLE FRACTION OF LESS THAN 1.2% BY WEIGHT.
References Cited (Backward Citations)
US2241322A
Cited
US3060173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |