Process for the preparation of polyether siloxanes

A process for the preparation of polyether siloxanes whose polyether radicals are bonded to the polysiloxane structure via Si-C bonds, in which polysiloxanes having the average formula in which at least one radical R is a radical of the formula is reacted with a compound containing at least one epox...

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Bibliographic Details
Main Authors SCHAEFER, DIETMAR, BURKHART, GEORG, WEWERS, DIETMAR, WEIER, ANDREAS
Format Patent
LanguageEnglish
French
German
Published 01.10.1997
Edition6
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:A process for the preparation of polyether siloxanes whose polyether radicals are bonded to the polysiloxane structure via Si-C bonds, in which polysiloxanes having the average formula in which at least one radical R is a radical of the formula is reacted with a compound containing at least one epoxide group in such amounts that at least two epoxide groups are present per OH group, in the presence of Lewis acids at temperatures of </= 60 DEG C or in the presence of complex catalysts which accelerate the addition reaction between epoxide groups and hydroxyl groups, at temperatures of up to 140 DEG C, and the reaction is optionally carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and contain no excess, unreacted polyol components.
Bibliography:Application Number: EP19930108726