US4599386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stable tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymers
Assignee: EIDP Inc
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Filing: 1984-10-18
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Granted: 1986-07-08
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Expires: 2004-10-18
Abstract
Abstract A tetrafluoroethylene-perfluoro(alkyl vinyl ether copolymer in which heat unstable carbinol end-groups (-CH2OH groups) present have been protected against heat degradation by treating the copolymer with NH3 or NH3 producing compounds.
Inventors
- 👤 Dana P. Carlson
- 👤 Dewey L. Kerbow
- 👤 Thomas J. Leck
- 👤 Allan H. Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:38
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A heat-stable melt-processible copolymer of tetrafluoroethylene and at least one perfluoro(alkyl vinyl ether) of the formula R.sub.f --O--CF═CF.sub.2 where R f is of 1-8 carbon atoms, said copolymer having at least about 8 --CONH 2 end groups per 10 6 carbon atoms present in the copolymer chain and having at least 15 --CH 2 OH end groups per 10 6 carbon atoms, said --CONH 2 end groups also being present in an amount substantially equal to or greater than the amount of any --COF and --COOH end groups present.
Claim 2
Dependent Claim
89 words
A heat-stable melt-processible copolymer of tetrafluoroethylene and at least one perfluoro(alkyl vinyl ether) of the formula R.sub.f --O--CF═CF.sub.2 where R f is of 1-8 carbon atoms, said copolymer having at least about 8 --CONH 2 end groups per 10 6 carbon atoms present in the copolymer chain and having at least 15 --CH 2 OH end groups per 10 6 carbon atoms, said --CONH 2 end groups also being present in an amount substantially equal to or greater than the amount of any --COF and --COOH end groups present.
Claim 3
Dependent Claim
47 words
The copolymer of claim 1 wherein the --CONH 2 end groups present are present in amounts of between 8 and 40 per 10 6 carbon atoms and the --CH 2 OH end groups present are present in amounts between 15 and 210 per 10 6 carbon atoms.
Claim 4
Dependent Claim
96 words
Process for stabilizing a melt-processible copolymer of tetrafluoroethylene and at least one perfluoro(alkyl vinyl ether) of the formula R f --O--CF═CF 2 where R f is of 1-8 carbon atoms, which copolymer contains between 15 and 210 --CH 2 OH end groups per 10 6 carbon atoms and at least 15 --COF and --COOH end groups per 10 6 carbon atoms, which comprises contacting the copolymer with NH 3 or a nitrogen-containing compound that produces NH 3 for a time sufficient to convert more than half the --COF and --COOH end groups to --CONH 2 groups.
Claim 5
Dependent Claim
96 words
Process for stabilizing a melt-processible copolymer of tetrafluoroethylene and at least one perfluoro(alkyl vinyl ether) of the formula R f --O--CF═CF 2 where R f is of 1-8 carbon atoms, which copolymer contains between 15 and 210 --CH 2 OH end groups per 10 6 carbon atoms and at least 15 --COF and --COOH end groups per 10 6 carbon atoms, which comprises contacting the copolymer with NH 3 or a nitrogen-containing compound that produces NH 3 for a time sufficient to convert more than half the --COF and --COOH end groups to --CONH 2 groups.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |