Evonik Operations Gmbh

Evonik Degussa Gmbh

Ute Hesse

Philippe Favresse

Michael Fiedel

Wilfried Knott

Horst Dudzik

Olga Fiedel

A reaction product containing a non-cyclic alkoxy-functional polysiloxane is produced by heating a reaction system, which contains a cyclic polyorganosiloxane of the formula [(RSiO)], where the subscript n is an integer of at least 4 and each Ris an alkyl group or aryl group; a silane of the formula RSi(OR), where the subscript m is an integer from 1 to 4, each Rindependently is an alkyl group or aryl group, a hydrocarbyl group or a halogenated hydrocarbyl group and each Rindependently is an alkyl group; and a catalyst system comprising a metal trifluoromethanesulfonate of the formula [M][CFSO], where M is a metal atom selected from sodium (Na) and potassium (K), and a Br&#xf8;nsted acid, wherein Br&#xf8;nsted acids having a pKa&#x2264;3.0, preferably having a pKa&#x2264;2.0, particularly preferably having a pKa&#x2264;&#x2212;0.0 are used.

Process for producing non-cyclic alkoxy-functional polysiloxanes

SiOC-bonded polyether siloxanes are produced by transesterification of alkoxysiloxanes with polyetherols in the presence of trifluoromethanesulfonate as catalyst. The computational total water content of the reactants including alkoxysiloxanes and polyetherols is &#x2264;5000 ppm by mass, advantageously &#x2264;300 ppm by mass, preferably &#x2264;150 ppm by mass, more preferably &#x2264;100 ppm by mass, in particular &#x2264;50 ppm by mass. The determination of the individual water contents is performed beforehand, preferably by titration according to Karl Fischer.

Production of SiOC-bonded polyether siloxanes

A process for producing SiOC-bonded polyether siloxanes by transesterification of alkoxysiloxanes with polyetherols in the presence of zinc acetylacetonate as catalyst is described.

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Essen, Germany

Ute Hesse