Method for preparing polyether polyols

US6486361B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Stephan Ehlers · West Chester, US
• Jörg Hofmann · Krefeld, DE
• Manfred Dietrich · Leverkusen, DE
• Pramod Gupta · Bedburg, DE
• Christian Steinlein · Ratingen, DE
• Horst Zwick · Dormagen, DE

Key dates

• Filing date: Mar 20, 2002
• Grant date: Nov 26, 2002
• Expiry date: Mar 20, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of polyether polyols by means of double metal cyanide (DMC) catalysts, in which the induction phase is shortened markedly. By continuous dispensing of an alkylene oxide into the starter-catalyst mixture it is possible to achieve a substantial shortening of the induction phase by comparison with the batch-wise activation.