Patent ID: 7038001

Claim:
Process for the preparation of a nonturbid, functionalized silicone oil of stable viscosity, the process comprising: hydrosilylating polyorganohydrosiloxane with synthons wherein: (1) the synthons hydrosilylated with the polyorganohydrosiloxane are different or identical, comprising at least one hydrocarbon-comprising ring in which is included at least one oxygen atom, (2) said hydrosilylation reaction is carried out in the presence of a heterogeneous catalytic composition to reduce reactions that can form a gum and/or resin during devolatilization, the heterogeneous catalytic composition comprising a metal selected from the group consisting of cobalt, rhodium, ruthenium, platinum and nickel deposited on an inert support, said inert support selected from the group consisting of carbon black, charcoal, alumina, silicate and barium oxide, and (3) the polyorganohydrosiloxane is linear or cyclic and has the mean formulae; and/or in which: the symbols R 2 are identical or different and correspond to a monovalent hydrocarbon-comprising radical chosen from the phenyl radical and linear or branched alkyl radicals having from 1 to 6 carbon atoms; the symbols x are identical or different and correspond to a monovalent radical chosen from R 2 , a hydrogen atom, a methoxy radical and an ethoxy radical; a and b are integers or fractions, such that: 0<a≦200, 0≦b>200, and at least on of the two x groups corresponds to the hydrogen radical if b=0, 5<a+b≦200; c and d are integers or fractions, such that: 0<c<5, 1<d<10, 3<c+d<10 wherein the synthon has the formula: and (4) devolatilizing a silicone oil obtained from the hydrosilylation reaction wherein the functionalized oils obtained are colorless and prepared in the presence of said catalytic composition, the inert support for which is carbon black.