Patent ID: 8889796
Filing Date: 2014-11-18
Classification: C08F,C08K

Abstract:
1. A perfluoroelastomer composition comprising a perfluoroelastomer comprising: (a) a tetrafluoroethylene unit, (b) a perfluoro vinyl ether unit represented by the formula (I): wherein Rf is a linear or branched perfluoroalkylene group having 1 to 6 carbon atoms; “n” is an integer of 2 to 20, and when “n” is 2 or more, Rfs in “n” (RfO) units may be the same or different; Rf′ is a linear or branched perfluoroalkyl group having 1 to 6 carbon atoms, and (c) a cure site unit having a nitrile group, a carboxyl group and/or an alkoxycarbonyl group as a cure site, said perfluoro vinyl ether unit (b) being contained in an amount of 13 to 23% by mole in the perfluoroelastomer, wherein a glass transition temperature of the perfluoroelastomer is −70° C. to −10° C., and wherein a temperature of the perfluoroelastomer measured with a thermogravimetric/differential thermal analyzer at 20% mass reduction is not less than 445° C.