SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers

US10954344B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Wilfried Knott · Essen, DE
• Horst Dudzik · Essen, DE
• Dagmar Windbiel · Essen, DE

Key dates

• Filing date: Jun 28, 2019
• Grant date: Mar 23, 2021
• Expiry date: Aug 8, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/70
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The production of SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units by reaction of polyether diols with trifluoromethanesulfonic acid-acidified, equilibrated α,ω-diacetoxypolydimethylsiloxanes is described, wherein the reaction is undertaken by adding a solid, liquid or gaseous base, optionally using inert solvents.