Aqueous dispersions of functional graft polyorgano

专利名称：Aqueous dispersions of functional graft

polyorganosiloxanes and curable siliconecompositions comprised thereof

发明人：Edith Cavivenc,Joel Richard申请号：US08/621320申请日：19960325公开号：US05618879A公开日：19970408

摘要：Stable reactive aqueous dispersions of functional graft polyorganosiloxanes,well suited for formulation into curable silicone compositions useful in the production ofrelease- and other coatings and paints, comprise the polymerizate of at least oneethylenically unsaturated monomer with a functional polyorganosiloxane whichcomprises identical or different recurring structural units of formula (I):

R.sub.a Y.sub.b X.sub.c SiO.sub.(4-a-b-c)/2 (I)

< P> in which the radicals R, which may be identical or different, are each a C.sub.1 -C.sub.18 alkyl radical, a C.sub.2 -C.sub.20 alkenyl radical, or a C.sub.6 -C.sub.12 aryl oraralkyl radical, or halogen- substituted such radical; the radicals X, which may be identicalor different, are each a hydrogen atom or a reactive functional group bonded to a siliconatom via an Si-C or Si-O-C linkage; the radicals Y, which may be identical or different, areeach an ethylenically unsaturated hydrocarbon radical optionally comprising one or moreof the heteroelements O and/or N, and bonded to a silicon atom of the structural unit offormula (I) via an Si- C linkage and reactive with said at least one ethylenically unsaturatedmonomer; a, b and c are each equal to 0, 1, 2 or 3; and a+b+c=0, 1, 2 or 3; with the proviso

that the number of SiO. sub.4/2 units is less than 30 mol % and the number of structuralunits of formula (I) in which the silicon atom is substituted by a functional group X and/ora radical Y is such that the polyorganosiloxane comprises (i) at least 5 milliequivalents,preferably from 10 to 500 milliequivalents, of X functional groups per 100 grams ofpolyorganosiloxane of formula (I) and (ii) at least 5 milliequivalents, preferably from 10 to500 milliequivalents, of Y radicals per 100 grams of polyorganosiloxane of formula (I).

申请人：RHONE-POULENC CHIMIE

代理机构：Burns, Doane, Swecker & Mathis, LP.

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