Primer composition used for adhesion
AssigneeDow Corning Corporation
InventorsMitsuo Hamada, Sadami Yasuda
Life of this patent
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Abstract
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.
Claims17
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
- R.sub.a R.sub.b 'Si(OR.sup.2).sub.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 XR.sup.3 - 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 R.sup.3 is a divalent radical selected from the group consisting of hydrocarbon radicals, halogenated hydrocarbon radicals, hydroxyhydrocarbon radicals and ether radicals;
- R.sup.2 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.
A primer composition for adhering silicone rubber to a substrate 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
- R.sub.a R.sub.b 'Si(OR.sup.2).sub.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 XR.sup.3 - 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 R.sup.3 is a divalent radical selected from the group consisting of hydrocarbon radicals, halogenated hydrocarbon radicals, hydroxyhdrocarbon radicals and ether radicals;
- R.sup.2 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.
Dependencies are inferred from the claim text.