Patent Number: 7,825,209

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

Abstract: The invention relates to a process for the preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers having (AB) repeat units, via reaction of one or more polyetherdiols with a stoichiometric excess of .alpha.,.omega.-dihydropolydimethylsiloxanes and at least one tertiary amine as catalyst, which comprises, after completed reaction of the alcohol component, continuing the reaction in the presence of small amounts of water until no remaining .ident.Si(H) groups are detectable by a gas-volumetric method.

Inventors: Knott; Wilfried (Essen, DE), Klein; Klaus-Dieter (Muelheim, DE), Landers; Rudiger (Essen, DE), Windbiel; Dagmar (Essen, DE)

Assignee: Evonik Goldschmidt GmbH

International Classification: C08G 77/04 (20060101); C08G 77/06 (20060101); C08G 77/08 (20060101)

Expiration Date: 2019-11-02 0:00:00