Production of SiOC-bonded polyether siloxanes

US11236204B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Philippe Favresse · Ratingen, DE
• Michael Fiedel · Essen, DE
• Ute Hesse · Essen, DE

Key dates

• Filing date: May 26, 2020
• Grant date: Feb 1, 2022
• Expiry date: May 26, 2040

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2531/842
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

SiOC-bonded polyether siloxanes are produced by transesterification of alkoxysiloxanes with polyetherols in the presence of trifluoromethanesulfonate as catalyst. The computational total water content of the reactants including alkoxysiloxanes and polyetherols is ≤5000 ppm by mass, advantageously ≤300 ppm by mass, preferably ≤150 ppm by mass, more preferably ≤100 ppm by mass, in particular ≤50 ppm by mass. The determination of the individual water contents is performed beforehand, preferably by titration according to Karl Fischer.