US3048567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparation of superpolyamides suitable for forming hollow products and the hollow products so produced
Assignee: Onderzoekings Instituut Research
•
Filing: 1958-09-04
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Granted: 1962-08-07
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Expires: 1978-09-04
Abstract
No abstract record available.
Inventors
- 👤 Kohlwey Johann Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:21
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A METHOD FOR THE PREPARATION OF A SUPERPOLYAMIDE SUITABLE FOR FORMING HOLLOW ARTICLES THEREFROM, WHICH COMPRISES POLYMERIZING CAPROLACTAM IN THE PRESENCE OF A STABILIZER SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND ACETIC ACID TO A SUPERPOLYAMIDE HAVING AN INTRINSIC VISCOSITY FROM 1.8 TO 3.5 BY HEATING THE CAPROLACTAM TO ABOUT 260*C. FOR A SUFFICIENT TIME IN A POLYMERIZATION ZONE, INCREASING THE TEMPERATURE IN A DISCHARGE ZONE TO ABOVE 280*C. TO STABILIZE THE INTRINSIC VISCOSITY AT ABOVE 1.7 PASSING THE POLYMER THROUGH A TEMPERATUREREGULATING ZONE FOR SEVERAL HOURS AT A TEMPERATURE OF ABOUT 240*C., AND FINALLY WASHING THE PRODUCT UNTIL IT CONTAINS LESS THAN 4.0% BY WEIGHT OF WATER-SOLUTION CONTENT, WHEREBY THE POLYMER MAY BE MELTED, EXTRUDED, AND BLOW-MOLDED IN FREE SPACE TO FORM HOLLOW ARTICLES THEREFROM.
Claim 2
Independent Claim
128 words
A METHOD FOR THE PREPARATION OF A SUPERPOLYAMIDE SUITABLE FOR FORMING HOLLOW ARTICLES THEREFROM, WHICH COMPRISES POLYMERIZING CAPROLACTAM IN THE PRESENCE OF A STABILIZER SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND ACETIC ACID TO A SUPERPOLYAMIDE HAVING AN INTRINSIC VISCOSITY FROM 1.8 TO 3.5 BY HEATING THE CAPROLACTAM TO ABOUT 260*C. FOR A SUFFICIENT TIME IN A POLYMERIZATION ZONE, INCREASING THE TEMPERATURE IN A DISCHARGE ZONE TO ABOVE 280*C. TO STABILIZE THE INTRINSIC VISCOSITY AT ABOVE 1.7 PASSING THE POLYMER THROUGH A TEMPERATUREREGULATING ZONE FOR SEVERAL HOURS AT A TEMPERATURE OF ABOUT 240*C., AND FINALLY WASHING THE PRODUCT UNTIL IT CONTAINS LESS THAN 4.0% BY WEIGHT OF WATER-SOLUTION CONTENT, WHEREBY THE POLYMER MAY BE MELTED, EXTRUDED, AND BLOW-MOLDED IN FREE SPACE TO FORM HOLLOW ARTICLES THEREFROM.
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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) | 1965-08-06 | 1966-02-05 | 1966-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-06 | 1970-02-05 | 1970-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-06 | 1974-02-05 | 1974-08-07 | $7700.00 | Window Closed / Lapsed |