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.
Claims39
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 hydrocarbon or heterocarbon compound containing a terminal carbon to carbon double bond to form a monohydridosiloxane, isolating the monohydridosiloxane from the first step;
- and in a second step, hydrosilylating the isolated 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 for the formation, of an asymmetric organosiloxane comprising:
- effecting a monoselective hydrosilylation reaction between a dihydridosiloxane and a compound having an aliphatic unsaturated bond in the presence of a precious metal catalyst to form a monohydridosiloxane;
- isolating the monohydridosiloxane and further hydrosilylating the monohydridosiloxane with an alkylene oxide compound to form the asymmetric organosiloxane.
Dependencies are inferred from the claim text.