Method for producing a polyoxyalkylene polyester polyol

US12054581B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Elisabeth Vogelsang · Cologne, DE
• Joerg Hofmann · Krefeld, DE
• Marina Reithmeier · Cologne, DE
• Philipp Sander · Grevenbroich, DE
• Sascha Froebel · Düsseldorf, DE
• Klaus Lorenz · Worms, DE

Key dates

• Filing date: Dec 18, 2019
• Grant date: Aug 6, 2024
• Expiry date: Mar 31, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing a polyoxyalkylene polyester polyol by reacting a polyoxyalkylene polyol with a lactone in the presence of a Brønsted acid catalyst, wherein the catalyst has a pKa value of 1 or less; the number-average molar mass of the polyoxyalkylene polyol is ≥1000 g/mol, preferably ≥1500 g/mol, particularly preferably ≥2000 g/mol; and in the lactone a CH2 group is bonded to the ring oxygen. The invention further relates to polyoxyalkylene polyester polyols obtainable using the method according to the invention, and to a method for producing polyurethanes by reacting the polyoxyalkylene polyester polyols according to the invention with polyisocyanates.