Claims
- 1. A fluoroelastomeric copolymer exhibiting high resistance to bases and alcohols, good mechanical properties and low-temperature resistance, and comprising, in mole percentages:
- a) 4-75% of vinylidene fluoride (VDF) units;
- b) 12-40% of units selected from the group consisting of hexafluoropropene(HFP), perfluorovinylether (PVE), hydropentafluoropropene (HEPE), chlorotrifluoroethylene (CTFE) and mixtures thereof;
- c) 2-35% of units of an olefin (OL) having 2 to 4 carbon atoms; and
- d) 2-60% of tetrafluoroethylene (TFE) units; wherein, when the total percentage of OL and PVE is equal to or greater than 70%, the Mooney viscosity of the copolymer is at least 10 ML(1+10).sup.121.
- 2. The copolymer of claim 1 wherein, when the total percentage of OL and PVE is equal to or greater than 70%, the Mooney viscosity is between 20 and 60 ML(1+10).sup.121.
- 3. The copolymer of claim 1, wherein the mole percentage of compound b) is 15-30%.
- 4. The copolymer of claim 1, wherein the mole percentages of components a), b), c) and d) are:
- a) 10-70%;
- b) 15-30%;
- c) 4-30%;
- d) 4-50%.
- 5. The copolymer of claim 1, wherein the mole percentages of components a), b), c) and d) are:
- a) 20-70%;
- b) 18-27%;
- c) 4-30%;
- d) 4-40%.
- 6. The copolymer of claim 1, wherein component b) is HFP, PVE or a mixture thereof, and the mole percentages of components a), b), c) and d) are:
- a) 20-50%;
- b) 18-27%;
- c) 10-30;
- d) 10-35%.
- 7. The copolymer of claim 1, wherein component b) is HFP, PVE or a mixture thereof, and the mole percentages of components a), b), c) and d) are:
- a) 4-20%;
- b) 18-27%;
- c) 20-35%;
- d) 20-40%.
- 8. The copolymer of claim 1, wherein component b) is HFP, PVE or a mixture thereof, and the mole percentages of components a), b), c) and d) are:
- a) 50-75%;
- b) 18-27%;
- c) 2-15%;
- d) 2-15%.
- 9. The copolymer of claim 1, wherein component b) is HFP or a mixture of HFP and perfluoromethylvinylether (MVE), component c) is ethylene (E), and the copolymer chains comprise sequences of the following monomer dyads:
- VDF-E;
- HFP-E; and
- TFE-E.
- 10. The copolymer of claim 1, wherein component b) is MVE, component c) is ethylene (E), and the copolymer chains comprise sequences of the following monomer dyads:
- VDF-E; and
- TFE-E.
- 11. The copolymer of claim 1, which comprises from 0.05 to 2 mole %, based on the total moles of components a), b), c) and d), of units selected from the group consisting of iodo- and bromo-olefins, bromoalkylvinylethers and mixtures thereof.
- 12. An elastomeric copolymer obtained from the copolymer of claim 11 by vulcanization with peroxides.
- 13. The copolymer of claim 1, containing terminal atoms of iodine, bromine or mixtures thereof.
- 14. An elastomeric copolymer obtained from the copolymer of claim 13 by vulcanization with peroxides.
- 15. An elastomeric copolymer obtained from the copolymer of claim 1 by ionic vulcanization.
- 16. The elastomeric copolymer of claim 15, wherein the ionic vulcanization is carried out with bisphenol AF and a quaternary phosphonium or ammonium salt.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI91A001339 |
May 1991 |
ITX |
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Parent Case Info
This is a continuation of U.S. Pat. Application Ser. No. 07/738,476, filed Jul. 31, 1991 now abandoned, which is incorporated by reference herein.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4381387 |
Sulzbach |
Apr 1983 |
|
4544720 |
Ohmori et al. |
Oct 1985 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
0208314 |
Jan 1987 |
EPX |
0359147 |
Mar 1990 |
EPX |
Non-Patent Literature Citations (1)
Entry |
"Fluoro-elastic copolymers and their production" EP-407937; Albano et al Jan. 16, 1991. |
Continuations (1)
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Number |
Date |
Country |
Parent |
738476 |
Jul 1991 |
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