Polyether-siloxane block copolymers for the production of polyurethane foams

US12252588B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Michael Ferenz · Essen, DE
• Michael Klostermann · Essen, DE
• Kai-Oliver Feldmann · Essen, DE
• Petra Schnell · Essen, DE
• Michelle Eckhoff · Essen, DE

Key dates

• Filing date: Nov 10, 2021
• Grant date: Mar 18, 2025
• Expiry date: Oct 6, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2483/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing polyether-siloxane block copolymers by hydrosilylation of alpha,omega-modified hydrosiloxanes with alpha,omega-modified di(meth)allyl polyethers in the presence of a hydrosilylation catalyst, wherein the reaction is performed in a solvent mixture comprising aromatic solvents, polyethers and alkoxylated alcohol, is described.