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:
Nov. 05, 2013
Filed:
Nov. 02, 2009
Manfred Winter, Dittelsheim-Hessloch, DE;
Hagen Weigl, Ladenburg, DE;
Hans-joachim Haehnle, Neustadt, DE;
Andreas Kramer, Friedelsheim, DE;
Manfred Winter, Dittelsheim-Hessloch, DE;
Hagen Weigl, Ladenburg, DE;
Hans-Joachim Haehnle, Neustadt, DE;
Andreas Kramer, Friedelsheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for the hydrolysis of polymers comprising vinylcarboxamide units by heating polymers comprising vinylcarboxamide units in an aqueous medium in the presence of acids or bases, wherein an aqueous solution or dispersion of a polymer comprising vinylcarboxamide units and an aqueous solution or a base or acid are fed continuously to a tubular reactor at elevated pressure, from 0.05 to less than one equivalent of a base or acid being used per vinylcarboxamide equivalent and the mixture being passed through the tubular reactor at a temperature of >100° C. to 250° C., depressurized and cooled.