Patent US5102965A successfully refreshed from Google Patents.
US5102965A
Expired / Lapsed
US
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Base resistant fluoroelastomers with improved processibility and curability
Assignee: EIDP Inc
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Filing: 1991-07-25
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Granted: 1992-04-07
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Expires: 2011-07-25
Abstract
Abstract Base-resistant peroxide-curable fluoroelastomers with improved processibility comprising a polymeric chain having tetrafluroethylene as one comonomer copolymerized with monomer units selected from the group (a) propylene, (b) propylene and vinylidene fluoride and (c) a C 2-3 hydrocarbon olefin and one or more perfluoro(alkyl vinyl ethers); said polymer chains having terminal iodo-groups.
Inventors
- 👤 Dana P. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:53
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/26; C08F214/265; C08F210/00; C08F210/04; C08F210/06; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A process for preparing a base-resistant peroxide-curable fluoroelastomer with improved processibility comprising copolymerizing (a) tetrafluoroethylene with propylene, (b) tetrafluoroethylene, propylene, and vinylidene fluoride or (c) tetrafluoroethylene ethylene and one or more perfluoro(alkyl vinyl ethers), said copolymerization being carried out in the presence of a compound of the formula RI 2 , wherein R is a saturated perfluorocarbon or chloroperfluorocarbon alkylene group of 3 or more carbon atoms, with at least 3 carbon atoms separating the iodo groups, said polymerization further being carried out at monomer pressures above about 1.7 MPa and at temperatures of about 25°-100° C.
Claim 2
Dependent Claim
97 words
A process for preparing a base-resistant peroxide-curable fluoroelastomer with improved processibility comprising copolymerizing (a) tetrafluoroethylene with propylene, (b) tetrafluoroethylene, propylene, and vinylidene fluoride or (c) tetrafluoroethylene ethylene and one or more perfluoro(alkyl vinyl ethers), said copolymerization being carried out in the presence of a compound of the formula RI 2 , wherein R is a saturated perfluorocarbon or chloroperfluorocarbon alkylene group of 3 or more carbon atoms, with at least 3 carbon atoms separating the iodo groups, said polymerization further being carried out at monomer pressures above about 1.7 MPa and at temperatures of about 25°-100° C.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene and propylene in the mole ratios 45-70/55-30.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene and propylene in the mole ratios 45-60/55-40.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene, propylene and vinylidene fluoride in the mole ratios 5-65/5-40/5-40, respectively.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene, propylene and vinylidene fluoride in the mole ratios 30-60/20-35/10-35, respectively.
Claim 7
Dependent Claim
48 words
The process of claim 1 wherein the fluoroelastomer comprises copolymerized units of tetrafluoroethylene, ethylene and one or more perfluoro(alkyl vinyl ethers) having the formula CF 2 =CFO(CF 2 ) n CF 3 , where n is 0-5 or perfluoro(alkoxyalkyl vinyl ethers), present in mole ratios of 32-60/10-40/20-40, respectively.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein the perfluor(alkyl vinyl ether) is perfluoro(methyl vinyl ether).
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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) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |