US 11,702,513 B2
Aqueous dispersion of hydrosoluble or hydroswellable polymer
Alexandre Omont, Andrezieux (FR); Renaud Souzy, Andrezieux (FR); Marc-Edouard Michel, Andrezieux (FR); and Bruno Sabot, Andrezieux (FR)
Assigned to S.P.C.M. SA, Andrezieux-Boutheon (FR)
Filed by S.P.C.M. SA, Andrezieux-Boutheon (FR)
Filed on Sep. 17, 2020, as Appl. No. 17/23,974.
Claims priority of application No. 19 10225 (FR), filed on Sep. 17, 2019.
Prior Publication US 2021/0079169 A1, Mar. 18, 2021
Int. Cl. C08J 3/07 (2006.01); C08K 3/30 (2006.01); C08K 3/32 (2006.01)
CPC C08J 3/07 (2013.01) [C08K 3/30 (2013.01); C08K 3/32 (2013.01); C08J 2333/26 (2013.01); C08K 2003/3054 (2013.01); C08K 2003/322 (2013.01)] 9 Claims
 
1. An aqueous dispersion comprising particles of a water-soluble polymer of average molecular weight greater than or equal to 0.5 million daltons, or of a water-swellable polymer, and a mixture of at least one sulfate salt and at least one phosphate salt in weight proportions of between 25:75 and 75:25, the water-soluble or water-swellable polymer being a homopolymer of acrylamide or methacrylamide, or of a copolymer of acrylamide or methacrylamide and of an anionic monomer selected from the group consisting of acrylic acid, methacrylic acid, 2-acrylamido-2-methylpropane sulfonic acid and the salts thereof, or of a copolymer of acrylamide or methacrylamide and of a cationic monomer selected from the group consisting of quaternized dialkylaminoethyl acrylate (DAMEA), quaternized dialkylaminoethyl methacrylate (DAMEMA), diallyldimethylammonium chloride (DADMAC), acrylamido propyltrimethylammonium chloride (APTAC), and methacrylamido propyltrimethylammonium chloride (MAPTAC),
wherein the mixture of at least one sulfate salt and at least one phosphate salt is a mixture of ammonium sulfate and diammonium phosphate; and
wherein the phosphate salt is not a polyphosphate salt.