Method for producing high molecular weight polyoxyalkylene polyols

US10457775B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Klaus Lorenz · Worms, DE
• Christian Steinlein · Ratingen, DE
• Horst Zwick · Dormagen, DE
• Markus Bodenmüller · Krefeld, DE
• Stephan Eckelmann · Pulheim, DE
• Friedhelm Baer · Dormagen, DE

Key dates

• Filing date: Aug 23, 2016
• Grant date: Oct 29, 2019
• Expiry date: Nov 7, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2650/58
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to an efficient method for producing polyoxyalkylene polyols with equivalent molar masses between 9500 and 23000 g/mol from one or more H-functional starter compounds, and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxide metering rate is reduced once a calculated equivalent molar mass of between 8000 and 9500 g/mol is reached.