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:
Jan. 16, 2007
Filed:
Jun. 02, 2004
Markus Klumpe, Mannheim, DE;
Kai-uwe Baldenius, Ludwigshafen, DE;
Claus Hackmann, Kirchheim, DE;
Arnulf Lauterbach, Ludwigshafen, DE;
Hans-peter Seelmann-eggebert, Limburgerhof, DE;
Matthias Zipplies, Neustadt, DE;
Markus Klumpe, Mannheim, DE;
Kai-Uwe Baldenius, Ludwigshafen, DE;
Claus Hackmann, Kirchheim, DE;
Arnulf Lauterbach, Ludwigshafen, DE;
Hans-Peter Seelmann-Eggebert, Limburgerhof, DE;
Matthias Zipplies, Neustadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process is described for purifying polyalkylene glycols obtained by adding alkylene oxide to alkylene glycol, in which, after addition is complete, the resultant polyalkylene glycol is treated at a pH of >7 with a bleaching agent selected from the group consisting of peroxides, peracids, percarbonates, perborates, peroxodisulfates or oxygen, in each case with or without addition of a bleaching activator. The process is suitable in particular for preparing polyethylene glycol having molar weights from 196 to 203 g/mol which meets requirements of pharmacopeias.