Silicone rubber adhesive

Claim 1

A silicone rubber adhesive composition comprising: (A) 100 weight parts of an organopolysiloxane having at least two silicon-bonded alkenyl groups in each molecule, (B) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in each molecule, in a quantity affording a value within the range of 0.5 : 1 to 5 : 1 for the molar ratio between the silicon-bonded hydrogen atoms in the instant component and the alkenyl groups in component (A), (C) 30 to 150 weight parts of a wet-method hydrophobicized reinforcing silica having a specific surface area of at least 200 m²/g and constituted of the SiO₂ unit and organosiloxane units selected from the group comprising the R₃SiO 1/2 unit, R₂SiO unit, RSiO 3/2 unit, and their mixtures wherein R in each formula is a substituted or unsubstituted monovalent hydrocarbon group, with the proviso that the organosiloxane unit/SiO₂ unit molar ratio is 0.08 to 2.0, (D) 0.05 to 10 weight parts of a silane coupling agent selected from the group consisting of acryl-functional silane coupling agents and methacryl-­functional silane coupling agents, (E) 0.05 to 10 weight parts of an epoxy-functional silane coupling agent, (F) 0 to 5 weight parts of the partial allyl ether of a multivalent alcohol, and (G) a platinum-type compound catalyst in a quantity sufficient to cause the curing of the composition of the present invention, wherein the tensile strength of said silicone rubber composition when uncured falls within the range of 1.5 kg/cm² to 5.0 kg/cm² at 25 degrees Centigrade.