US5225504A
Expired / Lapsed
US
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Process for producing peroxide-vulcanizable, fluorine-containing elastomer
Assignee: Nippon Mektron KK
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Filing: 1992-12-07
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Granted: 1993-07-06
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Expires: 2012-12-07
Abstract
Abstract A fluorine-containing elastomer capable of giving a primary vulcanization product with a good permanent set through peroxide vulcanization is produced by homopolymerization or copolymerization of a fluorine-containing olefin having 2 to 8 carbon atoms in the presence of an iodine and bromine-containing compound represented by the general formula RBrnIm, wherein R represents a fluorohydrocarbon group, a chlorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m each are integers of 1 and 2, and a small amount of perfluoro(vinylether) compound having a general formula of CF 2 ═CFO[CF 2 CF(CF 3 )O]m(CF 2 )nX, wherein X is a bromine atom or an iodine atom and m and n each are 1, 2 or 3.
Inventors
- 👤 Haruyoshi Tatsu
- 👤 Masashi Fukazawa
- 👤 Yuichi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:10
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/184
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A process for producing a peroxide-vulcanizable fluorine-containing elastomer, which comprises homopolymerizing or copolymerizing a fluorine-containing olefin having 2 to 8 carbon atoms in the presence of an iodine and bromine-containing compound represented by the general formula: RBrnIm wherein R is a fluorohydrocarbon group, a chlorofluoro-hydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m each are 1 or 2, and a perfluoro(vinylether) compound represented by the general formula: CF.sub.2 ═CFO[CF.sub.2 CF(CF.sub.3)O]m(CF.sub.2)nX wherein X is a bromine atom or an iodine atom and m and n each are 1, 2 or 3.
Claim 2
Dependent Claim
94 words
A process for producing a peroxide-vulcanizable fluorine-containing elastomer, which comprises homopolymerizing or copolymerizing a fluorine-containing olefin having 2 to 8 carbon atoms in the presence of an iodine and bromine-containing compound represented by the general formula: RBrnIm wherein R is a fluorohydrocarbon group, a chlorofluoro-hydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m each are 1 or 2, and a perfluoro(vinylether) compound represented by the general formula: CF.sub.2 ═CFO[CF.sub.2 CF(CF.sub.3)O]m(CF.sub.2)nX wherein X is a bromine atom or an iodine atom and m and n each are 1, 2 or 3.
Claim 3
Dependent Claim
38 words
A process according to claim 1, wherein the iodine and bromine-containing compound is used in an amount of about 0.001% to about 5% by weight in terms of iodine and bromine to be combined in the fluorine-containing elastomer.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein the perfluoro(vinylether) compound is used in a ratio about 0.001% to about 5% by mole to the fluorine-containing olefin.
Claim 5
Dependent Claim
32 words
A process according to claim 1, wherein the homopolymerizing or copolymerizing is carried out at a temperature of about -30° C. to about 150° C. in the presence of a polymerization initiator.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |