Patent ID: 6638999
Filing Date: 2003-10-28
Classification: C08F,C08K

Abstract:
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 40Â° C. and 330Â° C. to produce a guanidine; iv) compounds which decompose in-situ at a temperature between 40Â° C. and 330Â° C. to produce a primary or secondary amine; v) nucleophilic compounds of the formula R1â€”NHâ€”R2, wherein R1 is Hâ€”, 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, â€”CONHR3, â€”NHCO2R3, or â€”OH.HOOCâ€”C7F15, and R3 is a C1-C10 aliphatic hydrocarbon group; and vi) substituted amidines of the formula HN&boxH;CR4NR5R6, wherein R4, R5, R6 are independently Hâ€”, alkyl or aryl groups and wherein at least one of R4, R5 and R6 is not Hâ€”.