SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers

US11859053B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

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

Key dates

• Filing date: Jan 11, 2021
• Grant date: Jan 2, 2024
• Expiry date: Dec 13, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2101/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for producing SiOC-bonded, linear polydimethylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units, comprising pretreating acidified, end-equilibrated α,ω-diacetoxypolydimethylsiloxanes with a base and reacting the α,ω-diacetoxypolydimethylsiloxanes resulting therefrom with polyether diols in the presence of a solid, liquid or gaseous base, optionally using inert solvents.