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US4920170A
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Process for producing fluorine-containing elastic copolymer
Assignee: Nippon Mektron KK
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Filing: 1988-06-28
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Granted: 1990-04-24
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Expires: 2008-06-28
Abstract
Abstract A fluorine-containing elastic copolymer with distinguished low temperature characteristics, comprising (a) about 30 to about 80% by mole of tetrafluoroethylene, (b) about 5 to about 60% by mole of perfluoro(lower alkyl vinyl ether) and (c) a perfluoroether compound represented by following general formula: CF2=CFOCF2CFXORf wherein X: F or -CF3 and Rf: -CnF2n+1, is obtained by copolymerizing the (a) component, the (b) component and the (c) component in the presence of a radical polymerization initiator.
Inventors
- 👤 Masatoshi Abe
- 👤 Shin Okamoto
- 👤 Akihiro Naraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/262; C08F216/00; C08F216/12; C08F216/14; C08F216/1408
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for producing a fluorine-containing elastic copolymer comprising (a) 30 to 80% by mole of tetrafluoroethylene (b) 26 to 60% by mole of perfluoro (lower alkyl vinyl ether) and (c) 3 to 50% by mole of a perfluoroether compound represented by the following general formula: CF.sub.2 ═CFOCF.sub.2 CFXORf wherein X is a fluorine atom or a trifluoromethyl group and Rf is a perfluoroalkyl group, which comprises copolymerizing the (a) component, the (b) component and the (c) component in the presence of a radical polymerization initiator.
Claim 2
Dependent Claim
86 words
A process for producing a fluorine-containing elastic copolymer comprising (a) 30 to 80% by mole of tetrafluoroethylene (b) 26 to 60% by mole of perfluoro (lower alkyl vinyl ether) and (c) 3 to 50% by mole of a perfluoroether compound represented by the following general formula: CF.sub.2 ═CFOCF.sub.2 CFXORf wherein X is a fluorine atom or a trifluoromethyl group and Rf is a perfluoroalkyl group, which comprises copolymerizing the (a) component, the (b) component and the (c) component in the presence of a radical polymerization initiator.
Claim 3
Dependent Claim
22 words
A processor according to claim 1 wherein the (b) component has a perfluoro (lower alkyl) group having 1 to 5 carbon atoms.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein the (c) component has a perfluoroalkyl group having 1 to 12 carbon atoms.
Claim 5
Dependent Claim
22 words
A process according to claim 1 wherein the copolymerization reaction is carried out in the presence of an iodine and bromine-containing compound.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein the radical polymerization initiator is used in a redox system.
Claim 7
Dependent Claim
16 words
A process according to claim 1 wherein the copolymerization reaction is carried out by emulsion polymerization.
Claim 8
Dependent Claim
61 words
A fluorine-containing elastic copolymer comprising (a) 30 to 80% by mole of tetrafluoroethylene, (b) 16 to 60% by mole of perfluoro (lower alkyl vinyl ether) and (c) 3 to 50% by mole of a perfluoroether compound represented by the following general formula: CF.sub.2 ═CFOCF.sub.2 CFXORf wherein X is a fluorine atom or a trifluoromethyl group and Rf is a perfluoroalkyl group.
Claim 9
Dependent Claim
61 words
A fluorine-containing elastic copolymer comprising (a) 30 to 80% by mole of tetrafluoroethylene, (b) 16 to 60% by mole of perfluoro (lower alkyl vinyl ether) and (c) 3 to 50% by mole of a perfluoroether compound represented by the following general formula: CF.sub.2 ═CFOCF.sub.2 CFXORf wherein X is a fluorine atom or a trifluoromethyl group and Rf is a perfluoroalkyl group.
Claim 10
Dependent Claim
24 words
A fluorine-containing elastic copolymer according to claim 7 wherein the (b) component has a perfluoro (lower alkyl) group having 1 to 5 carbon atoms.
Claim 11
Dependent Claim
22 words
A fluorine-containing elastic copolymer according to claim 7 wherein the (c) component has a perfluoroalkyl group having 1 to 12 carbon atoms.
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |