US3898199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining polyamides from lactams
Assignee: AQUITAINE-TOTAL-ORGANICO TOUR AQUITAINE Ste
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Filing: 1974-09-25
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Granted: 1975-08-05
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Expires: 1994-09-25
Abstract
Abstract This invention concerns a process for obtaining polyamides in which the polyamide is mixed with one or more compounds having the formula: where R1 and R2 are organic radicals, and R is an organic radical or hydrogen.
Inventors
- 👤 Michel Biensan
- 👤 Philippe Potin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:17
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
34 words
A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYAMIDES WHICH COMPRISES ANIONICALLY POLYMERZING A LACTAM HAVING AT LEAST FOUR CARBON ATOMS IN THE RING IN THE PRESENCE OF AN ALKA ONE COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
34 words
A PROCESS FOR OBTAINING HIGH MOLECULAR WEIGHT POLYAMIDES WHICH COMPRISES ANIONICALLY POLYMERZING A LACTAM HAVING AT LEAST FOUR CARBON ATOMS IN THE RING IN THE PRESENCE OF AN ALKA ONE COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
13 words
A process according to claim 1 in which said compound is acetyl acetone.
Claim 4
Dependent Claim
14 words
A process according to claim 1 in which said compound is ethyl acetyl acetate.
Claim 5
Dependent Claim
22 words
A process according to claim 1 in which the lactam is polymerized in an anhydrous medium in the presence of sodium catalysts.
Claim 6
Dependent Claim
23 words
A process according to claim 1 in which the lactam is a member selected from the group consisting of caprolactam, dodecalactam and capryllactam.
Claim 7
Dependent Claim
32 words
A process according to claim 1 in which said compound is added to the resulting polymer at a ratio of between 0.05 and 2 mols to 100 mols of the initial lactam.
Claim 8
Dependent Claim
23 words
A process according to claim 6 in which between 0.2 and 1 mol of said compound to 100 mols of lactam is added.
Claim 9
Dependent Claim
25 words
A process according to claim 1 in which said compound is added after polymerization, by being mixed with the molten polymer in the polymerization reactant.
Claim 10
Dependent Claim
26 words
A process according to 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
US3855182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |