Silicone-polyether copolymer systems and process for preparing them by means of an alkoxylation reaction
AssigneeEvonik Goldschmidt GmbH
InventorsWilfried Knott, Frank Schubert, Frauke Henning
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Abstract
Process for the preferential alkoxylation of silicone-polyether copolymers either alone or in compositions thereof containing, for example, excess polyether by use of double metal cyanide catalysts.
Claims2
A process for the alkoxylation of SiC-bonded silicone-polyether copolymers having at least one reactive carbon-bonded hydroxyl group in compositions comprising of SiC-bonded silicone-polyether copolymers having at least one reactive carbon-bonded hydroxyl group and free polyetherols, wherein the increase in the average molar mass of the silicone-polyether copolymer used in admixture with free polyetherol occurs at least with the same rate as the increase in the molar mass of the free polyetherol present in the starting mixture, the process comprising:
- reacting the SiC-bonded silicone-polyether copolymers having at least one reactive carbon-bonded hydroxyl group, in the presence of a double metal cyanide catalyst, with epoxide monomers and, if appropriate, further monomers to form chain-extended, modified silicone-polyether copolymers.
Dependencies are inferred from the claim text.