Method for modifying the properties of an aqueous suspension

Details Method for modifying the properties of an aqueous suspension Method for modifying the properties of an aqueous suspension

C - Chemistry, Metallurgy

08

J

C08J 3/03 (2006.01) C08L 33/26 (2006.01)

Patent

CA 2751361

A method for modifying the properties of a suspension of solid or liquid particles in an aqueous medium, includes the step of adding to the suspension or to the aqueous medium a polymer prepared by inverse emulsion polymerization of monomers A b, comprising a betaine group, and of nonionic monomers B a included in an aqueous phase dispersed in the form of droplets in a hydrophobic external phase, wherein the molar ratio of the monomers Ab to the monomers B a is from about 4/96 to about 40/60, the polymer exhibits an intrinsic viscosity of greater than 600 mL/g, the reduced specific viscosity being measured by dissolving the polymer in a 20% by weight aqueous NaCI solution.

L'invention porte sur un procédé de modification des propriétés d'une suspension de particules solides ou liquides dans un milieu aqueux. Ce procédé comprend l'étape d'ajout, à la suspension ou au milieu aqueux, d'un polymère préparé par la polymérisation en émulsion inverse de monomères Ab, comportant un groupe bétaïne, et de monomères non ioniques Ba compris dans une phase aqueuse dispersée sous la forme de gouttelettes dans une phase externe hydrophobe, le rapport molaire des monomères Ab aux monomères Ba se situant dans la plage d'environ 4/96 à environ 40/60, le polymère présentant une viscosité intrinsèque supérieure à 600 ml/g, la viscosité spécifique réduite étant mesurée par la dissolution du polymère dans une solution aqueuse de NaCl à 20 % en poids.

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