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US 2026/0286128 A1Published application
Fluoroelastomer compounds
AssigneeDupont Specialty Products USA, LLC
InventorChristopher J. Bish
Life of this patent
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Abstract
The present invention is directed to perfluoroelastomer compounds comprising carbon black having a particle size of 100 nm or greater; a mineral filler, wherein the mineral filler is titanium dioxide; a cure site monomer; and a curing agent. These perfluoroelastomer compounds, when cured into articles, exhibit desirable compression stress relaxation properties.
Claims8
A perfluoroelastomer compound comprising:
- A. a perfluoroelastomer comprising copolymerized units of:
- (1) tetrafluoroethylene, hexafluoropropylene, or a mixture of these;
- (2) at least one perfluoro(alkyl vinyl) ether, perfluoro(alkoxy vinyl) ether, or a mixture of these;
- and
- (3) one or more cure site monomers comprising a functional group selected from the group consisting of nitrile groups, bromine atoms, and iodine atoms;
- B. at least one carbon black having a particle size of at least 60 nm;
- C. a mineral filler, wherein the mineral filler is titanium dioxide, and
- D. a curing agent;
- wherein said perfluoroelastomer compound in the shape of an O-ring, after curing and exposure to distilled water at 225° C. under 20 percent compression for 1500 hours using Wykeham-Farrence testing equipment, exhibits a sealing force retention measured at 90° C. which is at least 25 percent greater than an identical perfluoroelastomer compound lacking said mineral filler.
6 more elements
Dependencies are inferred from the claim text.