Selective hydrosilylation method with alcohol or epoxide reactant 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.
Claims45
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 hydrosilylation catalyst, with an olefin started alcohol containing a terminal carbon to carbon double bond or with an olefin started epoxide 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 form an asymmetric siloxane, comprising effecting a monoselective hydrosilylation reaction between a molar excess of a dihydridosiloxane and an olefin started alcohol or with an olefin started epoxide in the presence of a rhodium hydrosilylation catalyst to form a monohydridosiloxane;
- and hydrosilylating the monohydridosiloxane with alkylene oxide compound to form an asymmetric siloxane.
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Dependencies are inferred from the claim text.