초록

A mixture of an alkoxy containing silicon compound, a hydroperoxide, and organic solvent is a primer composition useful for bonding heat curing silicone rubber, especially fluorosilicone rubber, to a substrate.

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A method for adhering silicon rubber to a substrate comprising coating the substrate with a primer composition, air drying the coating for at least 30 minutes to form a primer coated substrate, applying a heat curable silicone rubber composition over the primer coated substrate to make an assembly,

A method for adhering silicon rubber to a substrate comprising coating the substrate with a primer composition, air drying the coating for at least 30 minutes to form a primer coated substrate, applying a heat curable silicone rubber composition over the primer coated substrate to make an assembly, heating the assembly to a temperature which cures the silicone rubber composition, and a silicone rubber bonded to the substrate is obtained, said primer composition consisting essentially of (A) 100 parts by weight of an alkoxy containing silicon compound selected from the group consisting of an alkoxysilane represented by the formula RaRb′Si(OR2)c wherein R is a monovalent radical selected from the group consisting of alkyl radicals, halogenated alkyl radicals, and aryl radicals; R′is a monovalent radical selected from the group consisting of alkenyl radicals and XR3- radicals in which X is a monovalent radical selected from the group consisting of acryloxy radical, methacryloxy radical, N-aminoalkylamino radical, amino radical, N-alkylamino radical, epoxy radical, and mercapto radical, and R3 is a divalent radical selected from the group consisting of hydrocarbon radicals, halogenated hydrocarbon radicals, hydroxyhydrocarbon radicals and ether radicals; R2 is an alkyl radical or an alkoxyalkyl radical; a has a value of 0 to 2 inclusive; b has a value of 0 to 2 inclusive; c has a value of 2 to 4 inclusive; the sum of a+b+c is 4; and partial hydrolysis condensates of at least one alkoxysilane defined above where said condensate contains at least two alkoxy radicals per molecule, (B) from 0.5 to 50 parts by weight of a hydroperoxide, and (C) an organic solvent.