Selective hydrosilylation method and product
AssigneeMomentive Performance Materials Inc.
InventorsDavid D. Farris, Chauncey J. Rinard, Mark D. Leatherman
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Abstract
An asymmetric siloxane is made by reacting a silicone having the formula MHDxM′H where MH is R1R2HSiO1/2, M′H is R4R5HSiO1/2 and x is an integer 0≦x≦10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefinic compound and in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating conditions with another olefinic compound different from the first olefinic compound.
Claims35
A method to make an asymmetric organosiloxane comprising in a first step, reacting a dihydridosiloxane under hydrosilylation conditions in the presence of a precious metal tris-substituted rhodium choloride hydrosilylation catalyst, with an hydrocarbon or heterocarbon compound containing a terminal carbon to carbon double bond to form a monohydridosiloxane, and in a second step, hydrosilylating the monohydridosiloxane with a second and different hydrocarbon or heterocarbon compound containing a terminal carbon to carbon double bond and in the presence of the same or different hydrosilylation catalyst under hydrosilylation conditions to form an asymmetrically substituted organosiloxane, wherein the asymmetric organosiloxane product contains at least one polyalkylene oxide group.
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A method to make an asymmetrically substituted organosiloxane comprising in a first step, reacting a molar excess up to less than 4:1 of a dihydridosiloxane under hydrosilylation conditions in the presence of a tris(triphenylphosphine) rhodium chloride catalyst with hydrocarbon or heterocarbon compound containing a terminal carbon to carbon double bond to form a monohydridosiloxane, and in a second step, hydrosilylating the monohydridosiloxane with a second and different hydrocarbon or heterocarbon compound containing a terminal carbon to carbon double bond and in the presence of the same or different hydrosilylation catalyst under hydrosilylation conditions to form an asymmetrically substituted organosiloxane, wherein the asymmetrically substituted organosiloxane contains at least one polyalkylene oxide group.
Dependencies are inferred from the claim text.