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:
Jan. 20, 2026
Filed:
Jul. 24, 2020
Basf SE, Ludwigshafen am Rhein, DE;
Xavier Mollat Du Jourdin, Seneffe, BE;
Joost Leswin, Ludwigshafen am Rhein, DE;
Michaela Reinsch, Ludwigshafen am Rhein, DE;
Nicole Specht, Ludwigshafen am Rhein, DE;
Janine Einhorn-Rech, Ludwigshafen am Rhein, DE;
Joerg Alexander Dimmer, Shanghai, CN;
Rainer Pache, Ludwigshafen am Rhein, DE;
Jochen Gattermayer, Ludwigshafen am Rhein, DE;
Hans-Juergen Denu, Ludwigshafen am Rhein, DE;
BASF SE, Ludwigshafen am Rhein, DE;
Abstract
The present application relates to a process for producing an aqueous polymer dispersion of polymerized ethylenically unsaturated monomers M by a multistage aqueous radical emulsion polymerization comprising a first aqueous radical emulsion polymerization step of a first monomer composition M.a and subsequently a further aqueous radical emulsion polymerization step of a second monomer composition M.b. The present application also relates to aqueous polymer dispersions obtainable by such a process and to the use thereof, in particular as a binder in coating compositions. The process comprises a multistage aqueous radical emulsion polymerization of ethylenically unsaturated monomers M, comprising a) at least one non-ionic, monoethylenically unsaturated monomer M1 having a solubility in deionized water of at most 60 g/L at 25° C. and 1 bar, b) at least one monoethylenically unsaturated monomer M2 selected from monomers having an acid group and their salts, and c) optionally one or more ethylenically unsaturated monomers M3, which are different from the monomers M1 and M2, where the process comprises i) a first step of an aqueous radical emulsion polymerization of a first monomer composition M.a consisting of monomers M1, M2 and optionally M3, to obtain a first aqueous polymer dispersion, where the monomer composition M.a comprises at most 2% by weight, in particular at most 1.5% by weight and especially at most 1.5% by weight or at most 1.0% by weight, based on the total weight of the monomers of the monomer composition M.a, of monomers M2, and subsequently ii) at least one further aqueous radical emulsion polymerization step of a second monomer composition M.b consisting of monomers M1, M2 and optionally M3, where the second step is performed in the aqueous polymer dispersion of the first step and in the presence of a chain transfer agent T, where the monomer composition M.b comprises 2 to 20% by weight, in particular from 5 to 18% by weight and especially from 8 to 16% by weight, based on the total weight of the monomers of the monomer composition M.b, of at least one monomer M2, where the weight ratio of the total weight of monomers of monomer composition M.a to the total weight of monomers of monomer composition M.b is in the range from 10:90 to 90:10, in particular in the range from 50:50 to 87:13, especially in the range from 60:40 to 85:15.