US3855182A
Expired / Lapsed
US
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Process for obtaining polyamides from lactams
Assignee: AQUITANE TOTAL ORGANO TOUR AQU
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Filing: 1972-08-16
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Granted: 1974-12-17
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Expires: 1992-08-16
Abstract
Abstract WHERE R1 and R2 are organic radicals, and R is an organic radical or hydrogen. This invention concerns a process for obtaining polyamides, in which the polymer is mixed with one or more substances with the general formula :
Inventors
- 👤 M Potin
- 👤 M Biesan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:22
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/48; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08K; C08K5/00; C08K5/04; C08K5/07
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
44 words
A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYAMIDES WHICH COMPRISES ANIONALLY POLYMERIZING AT LEAST ONE LACTAM HAVING AT LEAST 4 CARBON ATOMS IN THE RING IN THE PRESEENCE OF AN ALKALI CATALYST AND MIXING THE RESULTING POLYMER WITH ATLEAST ONE COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
44 words
A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYAMIDES WHICH COMPRISES ANIONALLY POLYMERIZING AT LEAST ONE LACTAM HAVING AT LEAST 4 CARBON ATOMS IN THE RING IN THE PRESEENCE OF AN ALKALI CATALYST AND MIXING THE RESULTING POLYMER WITH ATLEAST ONE COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
13 words
A process as defined in claim 1, in which the R is hydrogen.
Claim 4
Dependent Claim
23 words
A process as defined in claim 1, in which the lactam is polymerized in an anhydrous medium, in the presence of sodium catalysts.
Claim 5
Dependent Claim
14 words
A process as defined in claim 1, in which said compound is ethyl malonate.
Claim 6
Dependent Claim
23 words
A process as defined in claim 1, in which the lactam is a member of the group consisting of caprolactam, dodecalactam and capryllactam.
Claim 7
Dependent Claim
32 words
A process as defined in claim 1, in which said compound is added to the polymer at the ratio of between 0.05 and 2 moles to 100 moles of the initial lactame.
Claim 8
Dependent Claim
24 words
A process as defined in claim 6, in which between 0.2 and 1 mole of said compound per 100 moles of lactame are added.
Claim 9
Dependent Claim
26 words
A process as defined in claim 1, in which said compound is added after polymerization, by being mixed with the molten polymer in the polymerization reactor.
Claim 10
Dependent Claim
27 words
A process as defined in claim 1, in which said compound is added to the polymer by being made into a paste, followed by mixing or extrusion.
References Cited (Backward Citations)
US3207729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |