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:
Aug. 18, 2009
Filed:
Jun. 21, 2006
Oliver Struck, Düren, DE;
Andreas Pingel-keuth, Düren, DE;
Christian Przybyla, Duisburg, DE;
Ulrich Fehrenbacher, Karlsruhe, DE;
Thomas Hirth, Bühl, DE;
Steffen Unser, Rheinstetten, DE;
Oliver Struck, Düren, DE;
Andreas Pingel-Keuth, Düren, DE;
Christian Przybyla, Duisburg, DE;
Ulrich Fehrenbacher, Karlsruhe, DE;
Thomas Hirth, Bühl, DE;
Steffen Unser, Rheinstetten, DE;
Akzo Nobel N.V., Arnhem, NL;
Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V., Munich, DE;
Abstract
The invention relates to a process for the production of a nitrogen containing epihalohydrin polymer involving reaction of a nitrogen-containing precursor selected from the group consisting of amines, poly-amines, polyaminoamides, polyurethanes and mixtures thereof with epihalohydrin to form of a solution of said epihalohydrin polymer, the process comprising a purification step to remove organic impurities from the formed solution of the epihalohydrin polymer, said purification step comprising contacting the solution of the epihalohydrin polymer with a fluid under liquid, supercritical or near supercritical conditions to effect extraction of organic impurities from the solution of the epihalohydrin polymer to the fluid, withdrawing fluid enriched in organic impurities from the solution of the epihalohydrin polymer, and separating extracted impurities from the withdrawn fluid, wherein the fluid comprises a substance that at atmospheric pressure and room temperature (about 25° C.) is gaseous. The invention also relates to a process for purifying a solution of a nitrogen containing epihalohydrin polymer.