Hydrosilylation method, catalyst and method for making
AssigneeGeneral Electric Company
InventorRobert E. Williams, Jr.
Life of this patent
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Abstract
A hydrosilation catalyst is provided having platinum atoms anchored onto a hydroxylated oxide of silicon or aluminum by Pt-S linkages through sulfur organo siloxy groups. A hydrosilation method and a method for making such platinum catalyst is also provided.
Claims9
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.
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.sup.1 is a C.sub.(1-8) alkyl radical.
Dependencies are inferred from the claim text.