Patent ID: 7879450
Filing Date: 2011-02-01
Classification: C08J,F16J,Y10T

Abstract:
1. A method for preparing a rubber article, comprising the steps of: adding an untreated fumed silica in an amount of 0.5 to 50 parts by weight into 100 parts by weight of a heat-curable silicone rubber composition and mixing them together to form a substrate-forming composition (a), said heat-curable silicone rubber composition comprising (A) 100 parts by weight of diorganopolysiloxane having the average compositional formula (I):  wherein R 11 is a substituted or unsubstituted monovalent hydrocarbon radical, and a is a number in the range: 1.95≦a≦2.05, 0.01 to 15 mol % of the entire silicon-bonded R 11 radicals being a monovalent aliphatically unsaturated hydrocarbon radical, (B) 5 to 200 parts by weight of a surface-treated reinforcing filler, and (C) an effective amount of a crosslinker selected from a combination of organohydrogenpolysiloxane with a platinum group metal catalyst, and an organic peroxide, heat curing a substrate-forming composition (a) to form a silicone rubber substrate, applying a primer composition (b) comprising a fluoroalkylene or fluoropolyether compound having at least one alkenyl radical and at least one hydrolyzable silyl radical in the molecule onto a surface of the substrate, and disposing thereon a heat-curable perfluoropolyether elastomer composition (c) and curing the composition for integration.