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US 6,281,296 B1Granted
Curable perfluoroelastomer composition
AssigneeDuPont Dow Elastomers L.L.C.
InventorsJames Daniel MacLachlan, Peter Arnold Morken, Walter Werner Schmiegel, Kohtaro Takahashi
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Abstract
Perfluoroelastomer compositions comprising perfluoroelastomers having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer are cured with compounds that are capable of generating ammonia at temperatures of 40° C.-330° C. to produce cured compositions having excellent thermal stability. The ammonia-generating compounds also act as cure accelerators in perfluoroelastomer compositions that incorporate other curing agents.
Claims14
A curable composition comprising
- A. a perfluoroelastomer comprising copolymerized units of
- (1) tetrafluoroethylene, (2) a perfluorovinyl ether selected from the group consisting 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;
- and
- B. a compound selected from the group consisiting of acetaldehyde ammonia, hexamethylenetetramine, t-butyl carbamate, benzyl carbamate, phthalimide, urea, thiourea, tetramine copper (II) sulfate hydrate, biuret, and formamidine.
1 more element
A curable composition comprising
- A. a perfluoroelastomer comprising copolymerized units of
- (1) tetrafluoroethylene, (2) a perfluorovinyl ether selected from the group consisting 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;
- B. a compound selected from the group consisting of acetaldehyde ammonia, hexamethylenetetramine, t-butyl carbamate, benzyl carbamate, phthalimide, urea, thiourea, tetramine copper (II) sulfate hydrate, biuret, and formamidine;
- and
- C. a curative other than a compound that decomposes to produce ammonia.
2 more elements
Dependencies are inferred from the claim text.