The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2008
Filed:
Nov. 25, 2005
Klaus Poellmann, Burghausen, DE;
Anton Strasser, Altoetting, DE;
Reinhard Vybiral, Burgkirchen, DE;
Rainer Wagner, Burgkirchen, DE;
Klaus Poellmann, Burghausen, DE;
Anton Strasser, Altoetting, DE;
Reinhard Vybiral, Burgkirchen, DE;
Rainer Wagner, Burgkirchen, DE;
Clariant Produkte (Deutschland) GmbH, Frankfurt, DE;
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 R—(OCHCHR)—OH wherein Rrepresents an alkyl radical comprising between 1 and 4 C atoms, preferably R═CH, k represents a number between 1 and 10, preferably between 1 and 4, and R represents H, CHor an alkyl radical comprising between 2 and 4 C atoms, preferably R═H, CH. 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.