Back to results
US 6,638,999 B2Granted
Curable perfluoroelastomer composition
AssigneeDuPont Dow Elastomers L.L.C.
InventorsChristopher John Bish, Peter Arnold Morken, Walter Werner Schmiegel
Life of this patent
Estimating the term…
Abstract
Perfluoroelastomer compositions comprising perfluoroelastomers having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer are cured with certain nitrogen-containing nucleophilic compounds. The nucleophilic compounds also act as dual curatives in perfluoroelastomer compositions which incorporate other curing agents.
Claims12
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 nitrogen-containing nucleophilic compound selected from the group consisting of i) heterocyclic secondary amines;
- ii) guanidines;
- iii) compounds which decompose in-situ at a temperature between 40° C. and 330° C. to produce a guanidine;
- iv) compounds which decompose in-situ at a temperature between 40° C. and 330° C. to produce a primary or secondary amine;
- v) nucleophilic compounds of the formula R1—NH—R2, wherein R1 is H—, a C1-C10 aliphatic hydrocarbon group, or an aryl group having hydrogen atoms in the alpha positions, R2 is a C1-C10 aliphatic hydrocarbon group, an aryl group having hydrogen atoms in the alpha positions, —CONHR3, —NHCO2R3, or —OH.HOOC—C7F15, and R3 is a C1-C10 aliphatic hydrocarbon group;
- and vi) substituted amidines of the formula HN═CR4NR5R6, wherein R4, R5, R6 are independently H—, alkyl or aryl groups and wherein at least one of R4, R5 and R6 is not H—.
5 more elements
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 nitrogen-containing nucleophilic compound selected from the group consisting of i) heterocyclic secondary amines;
- ii) guanidines;
- iii) compounds which decompose in-situ at a temperature between 40° C. and 330° C. to produce a guanidine;
- iv) compounds which decompose in-situ at a temperature between 40° C. and 330° C. to produce a primary or secondary amine;
- v) nucleophilic compounds of the formula R1—NH—R2, wherein R1 is H—, a C1-C10 aliphatic hydrocarbon group, or an aryl group having hydrogen atoms in the alpha positions, R2 is a C1-C10 aliphatic hydrocarbon group, an aryl group having hydrogen atoms in the alpha positions, —CONHR3, —NHCO2R3, or —OH.HOOC—C7F15, and R3 is a C1-C10 aliphatic hydrocarbon group;
- and vi) substituted amidines of the formula HN═CR4NR5R6, wherein R4, R5, R6 are independently H—, alkyl or aryl groups and wherein at least one of R4, R5 and R6 is not H—;
- and
- C) a curative, other than the nitrogen-containing nucleophilic compound B).
6 more elements
Dependencies are inferred from the claim text.