Claims
- 1. An ionically vulcanizable fluoroelastomeric copolymer suitable for use in the manufacture of shaft seals and fuel hoses consisting essentially of the following non-brominated monomeric units:
- (a) 30-47% by weight of vinylidene fluoride (VDF);
- (b) 18-40% by weight of hexafluoropropene (HFP);
- (c) 3-20% by weight of a perfluoroalkylvinylether (PAVE);
- and
- (d) 10-30% by weight of tetrafluoroethylene (TFE);
- wherein the sum of the HFP and PAVE contents is between 27 and 50% by weight.
- 2. The fluoroelastomeric copolymer of claim 1, wherein the percentages by weight of components a), b), c) and d) are:
- a) 30-40%;
- b) 18-40%;
- c) 3-20%;
- d) 15-30%.
- 3. The fluoroelastomeric copolymer of claim 1, wherein the percentages by weight of components a), b), c) and d) are:
- a) 40-47%;
- b) 18-40%;
- c) 3-12%;
- d) 15-24%.
- 4. The fluoroelastomeric copolymer of claim 3 wherein the percentage by weight of component c) is between 3 and 9%.
- 5. The fluoroelastomeric copolymer of claim 3 wherein the percentage by weight of component c) is between 5 and 8%.
- 6. The fluoroelastomeric copolymer of claim 1, in which component (c) is selected from the group consisting of perfluoromethylvinylether, perfluoroethylvinylether and perfluoropropylvinylether.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI91 A 002041 |
Jul 1991 |
ITX |
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Parent Case Info
This is a continuation of U.S. application Ser. No. 07/774,772, filed Aug. 14, 1991, now abandoned, which is incorporated by reference herein.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4745165 |
Arcella et al. |
May 1988 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
2347389 |
Apr 1977 |
FRX |
953152 |
Mar 1964 |
GBX |
1496084 |
Dec 1977 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
744772 |
Aug 1991 |
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