Method for producing pure α-alkoxy-Ω-hydroxy-polyalkylene glycols

US7435857B2 · kind B2 · utility

Assignee

• Clariant Produkte (Deutschland) GmbH · DE

Inventors

• Klaus Poellmann · Burghausen, DE
• Anton Strasser · Altötting, DE
• Reinhard Vybiral · Altötting, DE
• Rainer Wagner · Martinsheim, DE

Key dates

• Filing date: Nov 25, 2005
• Grant date: Oct 14, 2008
• Expiry date: Nov 25, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2651
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing pure alpha-alkoxy-Ω-hydroxy-polyalkylene glycols, creating small impurities of the product on high-molecular a-Ω-di-hydroxy-polyalkylene glycols. The method is based on the use of high-boiling initiator alcohols of the following general structure R2—(OCH2CHR)k—OH wherein R2 represents an alkyl radical comprising between 1 and 4 C atoms, preferably R2═CH3, k represents a number between 1 and 10, preferably between 1 and 4, and R represents H, CH3 or an alkyl radical comprising between 2 and 4 C atoms, preferably R═H, CH3. The use of the cited initiator alcohols enables the mixture of a basic catalyst and an initiator alcohol to be dried in such a way that it has a very low water content, and thus to produce very low concentrations of unwanted a-Ω-di-hydroxy-polyalkylene glycol impurities.