Patent US4983680A successfully refreshed from Google Patents.
US4983680A
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Cured perfluoroelastomers and their preparation
Assignee: EIDP Inc
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Filing: 1988-05-25
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Granted: 1991-01-08
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Expires: 2008-05-25
Abstract
Abstract Perfluoroelastomers of tetrafluoroethylene, perfluoro (alkylvinylether) and a cure site monomer crosslinked with organic peroxide curing agent, and a process for their preparation.
Inventors
- 👤 Leo Ojakaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:34
CPC Classifications
C; C08; C08F; C08F8/00; C08F259/00; C08F259/08; C08F261/00; C08F261/06; C08K; C08K5/00; C08K5/04; C08K5/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
In a cured perfluoroelastomer composition prepared from polymerized units of tetrafluoroethylene, perfluoro (alkylvinylether) and a nitrile-containing monomer, the improvement wherein the perfluoroelastomer is crosslinked with a carbon-carbon linkage and wherein the cured perfluoroelastomer is substantially free from triazine linkages.
Claim 2
Dependent Claim
39 words
In a cured perfluoroelastomer composition prepared from polymerized units of tetrafluoroethylene, perfluoro (alkylvinylether) and a nitrile-containing monomer, the improvement wherein the perfluoroelastomer is crosslinked with a carbon-carbon linkage and wherein the cured perfluoroelastomer is substantially free from triazine linkages.
Claim 3
Dependent Claim
13 words
A cured perfluoroelastomer of claim 1 wherein the perfluoro (alkyvinylether) is perfluoro (methylvinylether).
Claim 4
Dependent Claim
28 words
A cured perfluoroelastomer of claim 2 wherein the perfluoroelastomer is polymerized from about 53-79.9 mole percent tetrafluoroethylene, 20-46.9 mole percent perfluoro (methylvinylether) and 0.1-2.5 mole percent nitrile-containing monomer.
Claim 5
Dependent Claim
15 words
A cured perfluoroelastomer of claim 3 wherein the nitrile-containing monomer consists essentially of perfluoro (8-cyano-5-methyl-3,6-dioxa-1-octene).
Claim 6
Dependent Claim
19 words
A cured perfluoroelastomer of claim 1 further characterized by an absence of triazine linkages, as determined by infrared analysis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |