Evonik Goldschmidt Corporation

Goldschmidt Ag

Juergen Droese

Wilfried Knott

Horst Dudzik

Georg Burkhart

Klaus-Dieter Klein

Dagmar Windbiel

Rüdiger Landers

Klaus Dieter Klein

Volker Moehring

The invention relates to a process for the preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers having (AB) repeat units, via reaction by methods known per se of polyetherdiols with a stoichiometric excess of &#x3b1;,&#x3c9;-dihydropolydimethylsiloxanes, in the presence of one or more compounds of elements of main group 13 and/or of transition group 3 as catalyst, which comprises, after completed reaction of the alcohol component, continuing the reaction until no remaining &#x2261;Si(H) groups are detectable by a gas-volumetric method, and also to the compounds thus prepared, and to their use as surfactant additives for the production of polyurethane ether foams.

Process for the preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers and their use

The invention relates to a process for the preparation of equilibration products of organosiloxanes by rearrangement of the siloxane bond to a cation exchange resin, the organopolysiloxanes thus obtainable and the use thereof.

Equilibration of siloxanes

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Essen, Germany

Juergen Droese