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US 6,191,208 B1Granted
Thermally stable perfluoroelastomer composition
AssigneeDupont Dow Elastomers L.L.S.
InventorKohtaro Takahashi
Life of this patent
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Abstract
Curable perfluoroelastomer compositions comprising A) a perfluoroelastomer having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer, B) anhydrous silica, and C) a curing agent exhibit excellent thermal stability and reduced tendency to generate hydrogen fluoride under high temperature conditions.
Claims15
A curable composition comprising
- A. a perfluoroelastomer comprising copolymerized units of (1) tetrafluoroethylene, (2) a perfluoro(vinyl ether) selected from the group consisting
- B. of perfluoro(alkyl vinyl) ethers, perfluoro(alkoxy vinyl) ethers, and mixtures thereof, and (3) a cure site monomer selected from the group consisting of nitrile-containing fluorinated olefins and nitrile-containing fluorinated vinyl ethers;
- C. 1-25 parts by weight per hundred parts by weight perfluoroelastomer of an anhydrous silica;
- and
- D. a curative for the perfluoroelastomer, said curative selected from the group consisting of i) an ammonium salt of an organic or inorganic acid;
- ii) a bis(aminophenol);
- and iii) a bis(aminothiophenol).
4 more elements
Dependencies are inferred from the claim text.