Claims
- 1. A curable fluoropolymer composition comprising:
a) a hydrogen-containing fluoroelastomer having units derived from a cure-site monomer, wherein the fluoroelastomer is capable of peroxide cure; b) a peroxide curative; c) optionally, a co-agent for the curative; and d) a non-fluorine-containing organo-onium; with the proviso that when the hydrogen-containing fluoroelastomer includes one or more units derived from vinylidene fluoride, the composition is essentially free from one or more inorganic acid acceptors.
- 2. The curable composition according to claim 1 wherein the fluoroelastomer is essentially free of one or more units derived from vinylidene fluoride.
- 3. The curable composition according to claim 2 wherein the composition is essentially free from one or more inorganic acid acceptors.
- 4. The curable composition according to claim 2 wherein the composition includes an inorganic acid acceptor.
- 5. The curable composition according to claim 1 wherein the fluoroelastomer includes one or more units derived from vinylidene fluoride.
- 6. The curable composition according to claim I wherein the fluoroelastomer further comprises pendant nitrile groups.
- 7. The curable composition according to claim 6 wherein the curative comprises an ammonia-generating compound.
- 8. The composition according to claim 1 further comprising a partially crystalline fluoropolymer.
- 9. A process for improving compression set of a cured fluoroelastomer comprising:
a. providing a curable fluoroelastomer composition comprising:
(i) a fluoroelastomer having units derived from at least one monomer comprising a carbon-bonded hydrogen and units derived from a cure-site monomer, wherein the fluoroelastomer is capable of peroxide cure; (ii) a peroxide curative; (iii) optionally, a co-agent for the curative; and (iv) a non-fluorine-containing organo-onium with the proviso that when the hydrogen-containing fluoroelastomer includes one or more units derived from vinylidene fluoride, the composition is essentially free from one or more inorganic acid acceptors; and b. curing the curable composition.
- 10. The process according to claim 9 wherein the fluoroelastomer is essentially free of one or more units derived from vinylidene fluoride.
- 11. The process according to claim 9 wherein the composition is essentially free from one or more inorganic acid acceptors.
- 12. The process according to claim 10 wherein the composition includes an inorganic acid acceptor.
- 13. The process according to claim 9 wherein the fluoroelastomer includes one or more units derived from vinylidene fluoride.
- 14. The process according to claim 9 wherein the fluoroelastomer further comprises pendant nitrile groups.
- 15. The process according to claim 14 wherein the curative comprises an ammonia generating compound.
- 16. A cured article comprising the composition of claim 1.
- 17. A cured article made according to the process of claim 9.
- 18. A cured fluoroelastomer comprising the reaction product of a curable composition comprising:
a) a hydrogen-containing fluoroelastomer having units derived from a cure-site monomer, wherein the fluoroelastomer is capable of peroxide cure; b) a peroxide curative; c) optionally, a co-agent for the curative; and d) a non-fluorine-containing organo-onium; with the proviso that when the hydrogen-containing fluoroelastomer includes one or more units derived from vinylidene fluoride, the composition is essentially free from one or more inorganic acid acceptors.
- 19. The cured fluoroelastomer according to claim 18 having improved compression set relative to the same cured fluoroelastomer made without the organo-onium.
Parent Case Info
[0001] This application is a continuation-in-part of U.S. application Ser. No. 09/495,600, filed Feb. 1, 2000, now pending.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09495600 |
Feb 2000 |
US |
Child |
09841615 |
Apr 2001 |
US |