Hydrosilylation method, catalyst and method for making

Claim 1

A hydrosilylation catalyst comprising a hydroxylated oxide of silicon or aluminum having from 0.1 to 1% by weight of chemically combined platinum atoms, which hydroxylated oxide of silicon or aluminum is derivatized with a plurality of ##STR8## groups attached to the surface hydroxylated oxide of silicon or aluminum by ##STR9## linkages, or ##STR10## linkages, respectively, as the result of reacting said hydroxylated oxide with a mercaptoorganoalkoxysilane and the platinum atoms are chemically combined to the surface of the hydroxylated oxide of silicon or aluminum through the derivatized groups by Pt--S linkages, where R is a divalent C.sub.(2-13) organo radical.

Claim 6

A method for making a platinum catalyst comprising (A) effecting reaction under conditions to provide the azeotropic removal of water and alcohol between an hydroxylated oxide of silicon or aluminum having a surface area of about 100 to about 800 square meters per gram and mercapto organo alkoxy silane of the formula, ##STR11## to produce a functionalized hydroxylated oxide of silicon or aluminum having a plurality of chemically combined mercapto organosiloxy groups attached to the surface of the hydroxylated oxide of silicon or aluminum by ##STR12## linkages, or ##STR13## linkages, respectively, (B) drying the resulting functionalized oxide of silicon or aluminum of (A), (C) effecting reaction under substantially anhydrous conditions between the functionalized oxide of silicon or aluminum of (B) and a platinum halide where there is utilized sufficient platinum halide to produce a catalyst composition having about 0.1% to 1 by weight of chemically combined platinum atoms and (D) recovering the resulting platinum catalyst from the mixture of (C) where R is a divalent C.sub.(2-13) organo radical and R 1 is a C.sub.(1-8) alkyl radical.

Claim 7

A method for making a platinum catalyst comprising (A) effecting reaction under conditions to provide the azeotropic removal of water and alcohol between an hydroxylated oxide of silicon or aluminum having a surface area of about 100 to about 800 square meters per gram and mercapto organo alkoxy silane of the formula, ##STR11## to produce a functionalized hydroxylated oxide of silicon or aluminum having a plurality of chemically combined mercapto organosiloxy groups attached to the surface of the hydroxylated oxide of silicon or aluminum by ##STR12## linkages, or ##STR13## linkages, respectively, (B) drying the resulting functionalized oxide of silicon or aluminum of (A), (C) effecting reaction under substantially anhydrous conditions between the functionalized oxide of silicon or aluminum of (B) and a platinum halide where there is utilized sufficient platinum halide to produce a catalyst composition having about 0.1% to 1 by weight of chemically combined platinum atoms and (D) recovering the resulting platinum catalyst from the mixture of (C) where R is a divalent C.sub.(2-13) organo radical and R 1 is a C.sub.(1-8) alkyl radical.