Patent ID: 7345118

Claim:
A method for preparing an elastomeric base composition having a fluorocarbon continuous phase comprising: (I) mixing by an extrusion process (A) a fluorocarbon elastomer having a glass transition temperature below 23° C. with (B) a compatibilizer selected from; (B′) organic compounds which contain 2 or more olefin groups, (B″) organopolysiloxanes containing at least 2 alkenyl groups, (B′″) olefin-functional silanes which also contain at least one hydrolyzable group or at least one hydroxyl group attached to a silicon atom thereof, (B″″) an organopolysiloxane having at least one organofunctional groups selected from amine, amide, isocyanurate, phenol, acrylate, epoxy, and thiol groups, and any combinations of (B′), (B″), (B′″), and (B″″), (C) an organic peroxide catalyst, (D) a silicone base comprising (D′) a diorganopolysiloxane gum containing at least 2 silicone bonded hydroxy groups, (D″) a filler, (E) an optional crosslinking agent, (F) a cure agent in an amount sufficient to cure said organopolysiloxane, and (II) dynamically vulcanizing the organopolysiloxane, wherein the weight ratio of fluorocarbon elastomer to silicone base in the elastomeric base composition ranges from 95:5 to 30:70.