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:
May. 10, 2016
Filed:
Feb. 11, 2013
Basf SE, Ludwigshafen, DE;
Rabie Al-Hellani, Ludwigshafen, DE;
Carmen-Elena Cimpeanu, Ludwigshafen, DE;
Juergen Schmidt-Thuemmes, Neuhofen, DE;
Dirk Lawrenz, Hassloch, DE;
Kristina Georgieva, Mannheim, DE;
Anja Song, Mannheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Described is an aqueous polymer dispersion comprising a chain growth addition polymer obtainable via free-radically initiated emulsion polymerization from ethylenically unsaturated, free-radically polymerizable monomers, wherein the chain growth addition polymer is formed to an extent of not less than 60 wt % from primary monomers selected from vinylaromatic compounds, conjugated aliphatic dienes, vinyl esters of saturated C- to C-carboxylic acids, esters of acrylic acid or of methacrylic acid with monohydric C- to C-alcohols, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds, or mixtures thereof, wherein the monomers are polymerized in the presence of lignosulfonate and wherein the chain growth addition polymer is branched or crosslinked. Also described is a process for preparing the aqueous polymer dispersion. The polymer dispersion is useful for preparing paper coating compositions.