Aqueous dispersions of graft functionalized polysiloxanes, their method of preparation and their use in curable silicone compositions

Abstract

Abstract Stable reactive aqueous dispersions of grafted functionalised polyorganosiloxanes consisting of grafted copolymer units derived from at least one ethylenically unsaturated monomer capable of polymerising by a radical route and from a functionalised polyorganosiloxane containing similar or different units of formula (I> RaYbXcSiO(4-a-b-c)/2 (I> in which formula: - the symbols R denote an alkyl, alkenyl, aryl or aralkyl group; - the symbols X denote a hydrogen atom or a reactive functional group bonded to a silicon atom by an Si-C or Si-O-C bond; - the symbols Y denote 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 a radical route with the said ethylenically unsaturated monomer(s); - a, b and c are equal to 0, 1, 2 or 3; - a + b + c = 0, 1, 2 or 3; the content of SiO4/2 units being lower than 30 mol%; the number of units of formula (I) in which the silicon atom carries an X functional group and/or a Y residue is such that the said polyorganosiloxanes contain - at least 5 milliequivalents, preferably from 10 to 500 milliequivalents, of X functional groups per 100 grams of polyorganosiloxane of formula (I), - at least 5 milliequivalents, preferably from 10 to 500 milliequivalents, of Y residues per 100 grams of polyorganosiloxane of formula (I). Use of the said aqueous dispersions of grafted functionalised polyorganosiloxanes for the production of silicone compositions which are curable under the effect of heat, radiations, electron beams etc and/or with the aid of a catalyst.

Inventors

• 👤 Edith Canivenc
• 👤 Joel Rés. Mermoz Richard

Bibliographic Details