Process for the preparation of polyether carbonate polyols

US9382417B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Christoph Gürtler · Cologne, DE
• Jörg Hofmann · Krefeld, DE
• Thomas Ernst Müller · Aachen, DE
• Aurel Wolf · Wülfrath, DE
• Stefan Grasser · Leverkusen, DE
• Burkhard Kohler · Leverkusen, DE

Key dates

• Filing date: Mar 24, 2011
• Grant date: Jul 5, 2016
• Expiry date: Apr 13, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/47
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerization of carbon dioxide (CO2) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of additives A) chosen from the group consisting of sterically non-hindered phenols, catechols, pyrocatechols, thiazines, phenothiazines, thiazoles, benzothiazoles, oxazines, phenoxazines, 2,2,6,6-tetramethylpiperidine 1-oxyl and nitrostyrenes and optionally in the presence of metal salts B).