Primer compositions for adhering silicone compositions

Claim 1

A primer composition for adhering silicone compositions to metal and plastic substrates comprising (1) the reaction product of a reaction mixture of an alkyl methacrylate or alkyl acrylate where the alkyl is selected from methyl, butyl and mixtures thereof, an acrylate silane of the formula, X Si Y .sub.3 wherein X is selected from the class consisting of CH.sub.2 ═CHCOO(CH.sub.2).sub.3 -- and CH.sub.2 ═C(CH.sub.3)COO(CH.sub.2).sub.3 -- and Y is a hydrolyzable radical and a vinyl containing siloxane of the formula, R.sub.a R'.sub.b SiO.sub.(4-a-b/2) in an organic solvent wherein there is present prior to reaction from 1 to 12 moles of said methacrylate or acrylate per mole of said acrylate silane and from 0.1 to 1 mole of said vinyl containing siloxane per mole of said methacrylate or acrylate, where R' is vinyl and R is selected from the class consisting of alkyl radicals, aryl radicals, cycloalkyl radicals and fluoroalkyl radicals of 1 to 8 carbon atoms, a varies from 1 to 3, b is 1 or 2 and the sum of a +b cannot exceed 4 and (2) at least 10% by weight of the total composition of a silane of the formula, X Si Y .sub.3 wherein X and Y are as previously defined wherein the reaction product is obtained by heating the reaction mixture at a temperature of 50°-120° C. in the presence of a peroxide catalyst.