Patent ID: 7553920

Claim:
A method for preparing a fluorocarbon elastomeric composition comprising: (I) first mixing (A) a silicone base comprising, (A′) a diorganopolysiloxane containing at least 2 alkenyl groups having 2 to 20 carbon atoms, and (A″) an optional reinforcing filler (B) an organohydrido silicon compound, (C) a platinum catalyst, to form a silicone compound; (II) mixing the silicone compound with (D) a fluorocarbon clastomer comprising a copolymer of vinylidene fluoride and hexafluoropropene, a terpolyrner of vinylidene fluoride, hexafluoropropene, and tetrafluoroethene, or a terpolymer of vinylidene fluoride, tetrafluoroethene, and perfluoromethylvinyl ether, (E) a compatibilizer selected from; (E 1 ) an organic compounds which contain 2 or more olefin groups, (E 2 ) organopolysiloxanes containing at least 2 alkenyl groups, (E 3 ) olefin-functional silanes which also contain at least one hydrolyzable group or at least one hydroxyl group attached to a silicon atom thereof, (E 4 ) an organopolysiloxane having at least one organofunctional groups selected from amide, isocyanurate, phenol, acrylate, epoxy, and thiol groups, (E 5 ) a dehydrofluorination agent, and any combinations of (E 1 ), (E 2 ), (E 3 ), (E 4 ) and (E 5 ), (F) an optional catalyst; and (III) then statically vulcanizing the silicone compound, wherein the weight ratio of fluorocarbon elastomer (D) to silicone base (A) in the fluorocarbon elastomeric composition ranges from 95:5 to 30:70 and the vulcanized silicone compound is dispersed within the fluorocarbon elastomer.