Polymer dispersion

US9005397B2 · kind B2 · utility

Assignees

• AKZO NOBEL N.V. · NL
• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Christian Przybyla · Duisburg, DE
• Oliver Struck · Henfenfeld, DE
• Andre Laschewsky · Potsdam, DE
• Bernd-Reiner Paulke · Potsdam, DE

Key dates

• Filing date: Aug 19, 2009
• Grant date: Apr 14, 2015
• Expiry date: Sep 11, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F220/585
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.