US4766190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel elastomeric fluoropolymer and preparation thereof
Assignee: Daikin Industries Ltd
•
Filing: 1986-10-10
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Granted: 1988-08-23
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Expires: 2006-10-10
Abstract
Abstract An elastomeric fluoropolymer comprising 12 to 50% by mole of repeating units derived from a perfluorovinyl ether of the formula: CF2=CFO-(CF2CFXO)m-Rf(I) wherein Rf is a C1-C6 perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88% by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5% by mole of repeating units of hexafluoropropylene having improved strength and compression set.
Inventors
- 👤 Shigeru Morita
- 👤 Kazuhiko Kuwahara
- 👤 Masayasu Tomoda
- 👤 Masahiko Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:50
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F2438/00; C08F2438/01
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
An elastomeric terpolymer consisting of 12 to 50% by mole of repeating units derived from a perfluorovinyl ether of the formula: CF.sub.2 ═CFO--(CF.sub.2 CFXO).sub.m --R.sub.f (I) wherein R f is a C 1 -C 6 perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88% by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5% by mole of repeating units of hexafluoropropylene.
Claim 2
Dependent Claim
77 words
An elastomeric terpolymer consisting of 12 to 50% by mole of repeating units derived from a perfluorovinyl ether of the formula: CF.sub.2 ═CFO--(CF.sub.2 CFXO).sub.m --R.sub.f (I) wherein R f is a C 1 -C 6 perfluoroalkyl group, X is a fluorine atom or a trifluoromethyl group and m is an integer of 1 to 5, 50 to 88% by mole of repeating units derived from tetrafluoroethylene and 0.1 to 5% by mole of repeating units of hexafluoropropylene.
Claim 3
Dependent Claim
18 words
The elastomeric terpolymer according to claim 1, wherein R f is a C 2 -C 4 perfluoroalkyl group.
Claim 4
Dependent Claim
11 words
The elastomeric terpolymer according to claim 1, wherein m is 1.
Claim 5
Dependent Claim
11 words
The elastomeric terpolymer according to claim 1, wherein m is 2.
Claim 6
Dependent Claim
18 words
The elastomeric terpolymer according to claim 1 which has a number average molecular weight of 20,000 to 500,000.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |