Method of functionalizing organosiloxane condensation products
AssigneeGeneral Electric Company
InventorsSlawomir Rubinsztajn, Jeffrey H. Wengrovius
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Abstract
An MQ resin is functionalized by heating with a functionalized organosilicon material such as a disiloxane or halosilane in the presence of a linear phosphonitrilic halide, a short chain linear phosphazene or a strong acid such as trifluoromethanesulfonic acid.
Claims9
A method for making a substantially silanol-free functionalized MQ resin which comprises effecting reaction between (A) 10 to 100 parts by weight of a functionalized organosilicon source material selected from the group consisting of organohalosilanes and organosiloxanes and having radicals selected from the group consisting of dialkylsilyl, alkenyldialkylsilyl, aryldialkylsilyl and haloalkyldialkylsilyl, and (B) 100 parts by weight of an MQ resin having about 30-70 mole percent of M units based on total silicon-containing units, in the presence of about 10-10,000 ppm of a catalytic material comprising a linear phosphonitrilic halide, a linear phosphazene having 0-4 NPCl.sub.2 units or an acid having a negative pK.sub.a.
Dependencies are inferred from the claim text.