Reactive siloxanes

US11795275B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Wilfried Knott · Essen, DE
• Horst Dudzik · Essen, DE
• Philippe Favresse · Ratingen, DE
• Michael Fiedel · Essen, DE
• André Brötzmann · Essen, DE

Key dates

• Filing date: Nov 19, 2019
• Grant date: Oct 24, 2023
• Expiry date: May 29, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention describes (i) reaction systems for the production of siloxanes bearing acetoxy functions, comprising a) silanes and/or siloxanes bearing alkoxy groups and/or b) silanes and/or siloxanes bearing acetoxy groups, c) silanes and/or siloxanes bearing hydroxy groups, d) optionally simple siloxane cycles and/or DT cycles, e) a reaction medium, comprising acetic anhydride, perfluoroalkanesulfonic acid and preferably acetic acid, (ii) a process for producing linear or branched siloxanes bearing acetoxy functions and also the use of same for producing polyethersiloxanes.