SiOC-based polyethersiloxanes

US11279804B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Wilfried Knott · Essen, DE
• Horst Dudzik · Essen, DE
• Dagmar Windbiel · Essen, DE
• Philippe Favresse · Ratingen, DE
• Michael Fiedel · Essen, DE
• André Brötzmann · Essen, DE
• Frauke Henning · Essen, DE
• Jan Caßens · Recklinghausen, DE
• Michael Ferenz · Essen, DE

Key dates

• Filing date: May 26, 2020
• Grant date: Mar 22, 2022
• Expiry date: May 26, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/46
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Branched SiOC-linked polyethersiloxanes have the following formula (I) where R1 is an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, but preferably 90% of the radicals R1 are methyl radicals; b has a value of from 1 to 10; a has a value of from 1 to 200, preferably 10 to 100, a value of from 3 to 70 when b is ≥1 and ≤4, or a value of from 3 to 30 when b is >4; and R2 denotes identical or different polyether radicals, but at least one radical R2 is a structural element radical of formula (II): where p=at least 2, preferably p=2-6, particularly preferably p=3.