US3923925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyamides with increase impact strength
Assignee: Bayer AG
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Filing: 1974-12-13
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Granted: 1975-12-02
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Expires: 1994-12-13
Abstract
Abstract A process for the production of polyamides with improved impact strength wherein the activated anionic polymerisation is carried out in the presence of a high molecular weight polyalkylene glycol.
Inventors
- 👤 Kurt Schneider
- 👤 Friedrich Fahnler
- 👤 Rolf Dhein
- 👤 Frieder Heydenreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20; Y; Y10; Y10S; Y10S525/00; Y10S525/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR THE PRODUCTION OF POLYAMIDES WITH IMPROVED IMPACT STRENGTH BY ACTIVATED ANIONIC POLYMERIZATION OF A MIXTURE COMPRISING AT LEAST ONE LACTAM HAVING AT LEAST 5 RING MEMBERS, 0.1 TO 1 MOLD %, BASED ON THE QUANTITY OF LACTAMS OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF MONO AND POLYISOCYANATES, AND CORRESPONDING MASKED ISOCYANATES, AND AN ALKALINE CaTALYST WHEREIN SAID MIXTURE IS POLYMERIZED AFTER THE ADDITION OF 0.4-3% BY WEIGHT OF A HIGH MOLECULAR WEIGHT POLYALKYLENE GLYCOL HAVING UNMODIFIED END GROUPS AND A MOLECULAR WEIGHT OF BETWEEN 20,000 ABD 35,000 AND AN OH NUMBER BELOW 6.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE PRODUCTION OF POLYAMIDES WITH IMPROVED IMPACT STRENGTH BY ACTIVATED ANIONIC POLYMERIZATION OF A MIXTURE COMPRISING AT LEAST ONE LACTAM HAVING AT LEAST 5 RING MEMBERS, 0.1 TO 1 MOLD %, BASED ON THE QUANTITY OF LACTAMS OF AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF MONO AND POLYISOCYANATES, AND CORRESPONDING MASKED ISOCYANATES, AND AN ALKALINE CaTALYST WHEREIN SAID MIXTURE IS POLYMERIZED AFTER THE ADDITION OF 0.4-3% BY WEIGHT OF A HIGH MOLECULAR WEIGHT POLYALKYLENE GLYCOL HAVING UNMODIFIED END GROUPS AND A MOLECULAR WEIGHT OF BETWEEN 20,000 ABD 35,000 AND AN OH NUMBER BELOW 6.
References Cited (Backward Citations)
US3704280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |