Aqueous dispersions of grafted functionalized polyorganosiloxanes, process for their preparation and their use for producing curable silicone compositions

摘要

Stable reactive aqueous dispersions of grafted functionalized polyorganosiloxanes composed of graft copolymer units derived from at least one ethylenically unsaturated monomer capable of radical polymerization and of a functionalized polyorganosiloxane containing similar or different units of formula (I) In which: R is an alkyl, alkenyl, aryl or aralkyl group; BR/ - the symbols X represent a hydrogen atom or a reactive functional group bonded to a silicon atom via an Si-C or Si-O-C bond; BR/ - the Y symbols represent an ethylenically unsaturated hydrocarbon residue bonded to a silicon atom of the unit of formula (I) by an Si-C bond and capable of reacting by radical means with said one or more monomers (s) ethylenically unsaturated (s); BR/ - a, b and c are 0, 1, 2, or 3; BR/ - a + b + c = 0, 1, 2 or 3; BR/ the rate of SiO4 / 2 units being less than 30 mol%; BR/ the number of units of formula (I) in which the silicon atom carries a function X and / or a residue Y is such that said polyorganosiloxanes contain BR/ - at least 5 milliequivalents, preferably 10 to 500 milliequivalents, X functions per 100 grams of polyorganosiloxane of formula (I), BR/ - at least 5 milliequivalents, preferably from 10 to 500 milliequivalents, Y residues per 100 grams of polyorganosiloxane of formula (I). Use of said aqueous dispersions of grafted functionalized polyorganosiloxanes for the production of heat-curable silicone compositions, radiation, electron beams and / or with the aid of a catalyst. / P