Production of PU foams

US12269916B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Isabelle Denise Wessely · Karlsruhe, DE
• Annegret Terheiden · Alpen, DE
• Rüdiger Landers · Essen, DE
• Roland Hubel · Essen, DE
• Wilfried Knott · Essen, DE
• Dagmar Windbiel · Essen, DE
• Horst Dudzik · Essen, DE

Key dates

• Filing date: Jan 6, 2021
• Grant date: Apr 8, 2025
• Expiry date: Sep 3, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• 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 and/or isocyanate trimerization reactions, and optionally one or more chemical or physical blowing agents, with use of SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units, obtainable through the reaction of polyether diols with equilibrated α,ω-diacetoxypolydialkylsiloxanes, wherein a sufficient amount of the SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units is added such that the proportion by mass of said component based on the finished PU foam is from 0.0001% to 10% by weight, preferably 0.01% to 6% by weight, especially 0.05% to 5% by weight.