Procédé de préparation d'éthers d'hydroxyméthylpoly-méthylsiloxanes

Methyl(organo-oxymethyl)siloxanes are produced by a process which comprises reacting at a temperature above 50 DEG C. an aliphatic or aromatic hydroxy-compound with a bromine-substituted methylpolysiloxane of the general formula:- wherein X stands for a radical R or the radical Br-CH2-and each R stands for methyl or a recurring structural unit of the general formula:- (the siloxane groups recurring as often as desired until the linear or branched chains terminate in R=CH3), and a tertiary nitrogen base, using for each gram-atom of bromine at least 1 gram-equivalent each of the hydroxy-compound and the nitrogen base, and conducting the reaction in such a manner that the nitrogen base is available to the bromine compound only in the presence of the hydroxy-compound. The hydroxy-compounds specified are monohydric or polyhydric alcohols, monohydric or polyhydric phenols, ether alcohols, polyalkylene glycols, polyalkylene glycol monoalkyl ethers, glycol monoesters and esters of aliphatic or aromatic hydroxycarboxylic acids. Many examples are given. The products of the invention are useful as heat resistant surface-active agents and as intermediates for modifying oils, elastomers and resins of organopolysiloxanes.