Process for reacting polyorganosiloxanes and their use

US7825206B2 · kind B2 · utility

Assignee

• EVONIK GOLDSCHMIDT GMBH · DE

Inventors

• Thomas Neumann · Frankfurt am Main, DE
• Wilfried Knott · Essen, DE

Key dates

• Filing date: Dec 14, 2007
• Grant date: Nov 2, 2010
• Expiry date: Sep 21, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/42
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a process for preparing SiOC-bonded polyorganosiloxanes by reacting, by processes known per se, hydroxyl-containing compounds with a stoichiometric excess of polyorganosiloxanes which contain —Si(H) units and are of the general formula (I) in the presence of one or more element compounds of main group III and/or of transition group 3 as a catalyst, wherein the reaction, on completion of conversion of the compounds containing hydroxyl groups, is continued until no further ≡Si—H groups are detectable by gas volumetric means, and also the compounds prepared in this way and their use.