Patent ID: 7834118
Filing Date: 2010-11-16
Classification: C08G,Y10S

Abstract:
1. A method to make an asymmetric 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(dibutylsulfide)rhodium trichloride catalyst with a 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 contains at least one polyalkylene oxide group.