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:
Sep. 02, 2014
Filed:
Oct. 13, 2010
Christian Meier, Darmstadt, DE;
Andreas Weber, Frankfurt, DE;
Johannes Vorholz, Alzenau, DE;
Alpertunga Kueksal, Nuremberg, DE;
Andreas Klosendorf, Bad Schwalbach, DE;
Pamela Boehmann, Weiterstadt, DE;
Marcus Denger, Brensbach, DE;
Norbert Hoffmann, Griesheim, DE;
Nikolaos Papadopoulos, Ginsheim-Gustavsburg, DE;
Christian Meier, Darmstadt, DE;
Andreas Weber, Frankfurt, DE;
Johannes Vorholz, Alzenau, DE;
Alpertunga Kueksal, Nuremberg, DE;
Andreas Klosendorf, Bad Schwalbach, DE;
Pamela Boehmann, Weiterstadt, DE;
Marcus Denger, Brensbach, DE;
Norbert Hoffmann, Griesheim, DE;
Nikolaos Papadopoulos, Ginsheim-Gustavsburg, DE;
Evonik Röhm GmbH, Darmstadt, DE;
Abstract
The invention relates to a process for preparing a (meth)acrylate copolymer containing quaternary ammonium groups from a monomer mixture selected from: (a) 80 to 99% by weight of a C1-C4-alkyl ester of acrylic acid or methacrylic acid; and (b) 20 to 1% by weight of an alkyl ester of acrylic acid or methacrylic acid with a quaternary ammonium group in the alkyl radical; and (c) 0 to 10% of further copolymerizable vinyl monomers whereby one or more polymerization initiators, optionally one or more molecular weight regulators and one or more solvents or of a solvent mixture are added to the monomer mixture to give a polymerization mixture, which is polymerized at temperatures from 30 to 120 C over a period of 2 to 24 hours, where the polymerization mixture is polymerized to a polymerization syrup with a conversion of the monomers to the copolymer of at least 99% by weight, where the polymerization syrup is subsequently degassed by distillation or by extrusion and the degassed polymerization syrup is further comminuted to a copolymer preparation in the form of a granulate or powder and where the copolymer preparation is characterized by a molecular weight (Mw) of 25.000 to 50.000, a polydispersity index of 2.0 to 3.0 and a residual solvent concentration of less than 10.000 ppm by weight.