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US 11,078,354 B2Granted
Fluoroelastomer compounds
AssigneeE.I. Deupont De Nemours and Company
InventorChristopher J. Bish
Life of this patent
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Abstract
The present invention is directed to compounds comprising a perfluoroelastomer and a blend of two different particle size carbon blacks that, when cured with a curing agent, comprise a heterocyclic or perfluorinated crosslink. Such compounds comprise copolymerized units of unsaturated fluorinated olefins, a perfluoro(vinyl ether), and a cure site fluorinated monomer having a nitrile cure site, plus a blend of carbon blacks. Articles cured from these compounds exhibit improved sealing force.
Claims19
A compound comprising:
- A. a perfluoroelastomer comprising a nitrile cure site;
- B. a blend of carbon blacks comprising:
- 1) a large particle size carbon black having a particle size ranging from about 150 to 500 nm, and
- 2) a small particle size carbon black having a particle size ranging from about 1 to 100 nm;
- and
- C. a curing agent;
- wherein the ratio of the concentration of the large particle size carbon black (1) to the concentration of the small particle size carbon black (2) ranges from 20 to 1 to 4 to 1, said concentrations expressed in units of phr.
4 more elements
Dependencies are inferred from the claim text.