Production of PU foams

US11332591B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Daniela Hermann · Düsseldorf, DE
• Roland Hubel · Essen, DE
• Annegret Terheiden · Alpen, DE
• Michael Ferenz · Essen, DE
• Wilfried Knott · Essen, DE
• Horst Dudzik · Essen, DE

Key dates

• Filing date: May 13, 2020
• Grant date: May 17, 2022
• Expiry date: Jun 20, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2200/0685
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for producing PU foams by reacting at least one polyol component with at least one isocyanate component in the presence of one or more catalysts that catalyse the isocyanate-polyol and/or isocyanate-water reactions and/or isocyanate trimerization, and optionally one or more chemical or physical blowing agents, with use of SiOC-bonded polyether siloxanes having branching in the siloxane moiety, prepared from branched siloxanes bearing acetoxy groups, wherein a sufficient amount of the SiOC-bonded polyether siloxane having branching in the siloxane moiety is added that the proportion by mass of this polyether siloxane (e) based on the finished PU foam is from 0.0001% to 10% by weight.