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BASF Patents Aqueous Dispersions of Water-Soluble Anionic Polymers



Published January 14, 2014
U.S. 8,540,974 B2
BASF has been granted a patent for an aqueous dispersion comprised of water-soluble and/or water-swellable anionic polymers of ethylenically unsaturated, anionic monomers; an aqueous medium; and a stabilizer comprised of (a) at least one water-soluble polymer selected from the groups consisting of graft polymers of vinyl acetate and/or vinyl propionate on (i) polyethylene glycols or (ii) polyethylene glycols or polypropylene glycols blocked at one or both terminal groups with alkyl, carboxyl or amino groups, polyalkylene glycols, polyalkylene glycols blocked at one or both terminal groups with alkyl, carboxyl or amino groups and (b) at least one water-soluble copolymer comprised of  (b1) nonionic monoethylenically unsaturated monomers, (b2) cationic monoethylenically unsaturated monomers and optionally (b3) anionic monoethylenically unsaturated monomers, the fraction of the interpolymerized cationic monomers being greater than that of the anionic monomers.


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