US4943622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing peroxide-vulcanizable, fluorine-containing elastomer
Assignee: Nippon Mektron KK
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Filing: 1988-05-17
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Granted: 1990-07-24
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Expires: 2008-05-17
Abstract
Abstract A fluorine-containing elastomer capable of giving a vulcanized 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 pressence of an iodine and bromine-containing compound represented by the general formula RBrn Im, where R represents a fluorohydrocarbon group, a chorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m are integers of 1 and 2, and a small amount of 1,1-difluoro-2-bromoethylene.
Inventors
- 👤 Akihiro Naraki
- 👤 Masatoshi Abe
- 👤 Shin Okamoto
- 👤 Jun Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 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: RBrn Im where R is a fluorohydrocarbon group, a chlorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m are integers of 1 and 2, and 1,1-difluoro-2-bromoethylene.
Claim 2
Dependent Claim
66 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: RBrn Im where R is a fluorohydrocarbon group, a chlorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m are integers of 1 and 2, and 1,1-difluoro-2-bromoethylene.
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 1,1-difluoro-2-bromomethylene is used in a ratio of about 0.05% to about 5% by mole to the fluorine-containing olefin.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein the homopolymerization or copolymerization is carried out at a temperature of about -30° to about 150° C. in the presence of a polymerization initiator.
Claim 6
Dependent Claim
32 words
A process according to claim 1, wherein the homopolymerization or copolymerization is carried out at a temperature of about 0° to about 50° C. in the presence of a Redox polymerization initiator.
References Cited (Backward Citations)
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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) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |