Patent ID: 7476711
Filing Date: 2009-01-13
Classification: C08J,C08K,C08L

Abstract:
1. A process for preparing a cured article, said process comprising: A. melt blending at a temperature between 300° and 350° C. i) a perfluoroelastomer comprising copolymerized units of 53.0-79.9 mole percent tetrafluoroethylene, 20.0-46.9 mole percent perfluoro(methyl vinyl) ether and 0.4 to 1.5 mole percent of a cure site monomer and ii) 51 to 300 parts by weight per hundred parts by weight perfluoroelastomer of a semi-crystalline copolymer comprising copolymerized units of tetrafluoroethylene and 5-12 weight percent of a perfluoro(alkyl vinyl ether), said semi-crystalline copolymer having an average particle size greater than 100 nm and a melting point, said blending done at a temperature above the melting point of said semi-crystalline copolymer, thus forming a blend; B. adding a curative in said blend at a temperature below 150° C.; and C. curing said composition to form a cured article.