Patent ID: 7897713

Claim:
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; wherein at least one hydrocarbon or heterocarbon compound comprises a polyalkylene oxide reactant comprising a polyether comprising a member selected from the group consisting of CH 2 ═CHCH 2 O(CH 2 CH 2 O) 8 H; CH 2 ═CHCH 2 O(CH 2 CH 2 O) 8 CH 3 ; CH 2 ═CHCH 2 O(CH 2 CH 2 O) 4 (CH 2 CH(CH 3 )O) 5 H; CH 2 ═CHO(CH 2 CH 2 O) 5 (CH 2 CH(CH 3 )O) 5 H; CH 2 ═C(CH 3 )CH 2 O(CH 2 CH 2 O) 4 (CH 2 CH(CH 3 )O) 5 C(═O)CH 3 ; and CH 2 ═CHCH 2 O(CH 2 CH 2 O) 5 (CH 2 CH(CH 3 )O) 2 (CH 2 CH(CH 2 CH 3 )O) 2 H.