Tailored SiOC-based polyethersiloxanes

US11261298B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

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

Key dates

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

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/03
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

SiOC-based polyethersiloxanes are prepared based on linear α,ω-hydroxy group-bearing siloxanes. In a first step, α,ω-acetoxy group-bearing linear polysiloxanes are prepared. In a second step, the α,ω-acetoxy group-bearing linear polysiloxanes are converted into the desired organosiloxane units, preferably shorter organosiloxane units, wherein the thus converted organosiloxane units have α,ω-acetoxy groups. In a third step, the α,ω-acetoxy group-bearing linear polysiloxanes from step 2 react with polyetherols to give SiOC-based polyethersiloxanes.