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:
Apr. 14, 2015
Filed:
Aug. 19, 2009
Christian Przybyla, Duisburg, DE;
Oliver Struck, Henfenfeld, DE;
André Laschewsky, Potsdam, DE;
Bernd-reiner Paulke, Potsdam, DE;
Christian Przybyla, Duisburg, DE;
Oliver Struck, Henfenfeld, DE;
André Laschewsky, Potsdam, DE;
Bernd-Reiner Paulke, Potsdam, DE;
Akzo Nobel N.V., Arnhem, NL;
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung E.V., Munich, DE;
Abstract
The invention relates to an aqueous polymer dispersion comprising an anionic water-soluble dispersion polymer comprising in polymerized form a monomer mixture comprising (i) one or more anionic monomers, (ii) a first non-ionic vinyl monomer which is acrylamide, and (iii) at least one second non-ionic vinyl monomer; a water-soluble salt and a stabilizer, wherein the water soluble salt is present in an amount of at least 2.0% by weight, based on the total weight of the dispersion. The invention further relates to a process for producing the aqueous polymer dispersion, use of the aqueous polymer dispersion as a flocculating agent in papermaking or for water purification, and a process for producing paper which comprises adding one or more drainage and retention aids comprising the aqueous polymer dispersion to an aqueous suspension containing cellulosic fibers and then dewatering the obtained suspension.