Aqueous dispersions of microparticles having a...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 2/16 (2006.01) C08F 2/44 (2006.01) C08F 292/00 (2006.01) C08L 51/10 (2006.01) C09D 151/10 (2006.01)

Patent

CA 2530122

The present invention is directed to an aqueous dispersion of microparticles comprising nanoparticulates, and to methods of preparing the dispersion, as well as to compositions containing such dispersions. The dispersion is prepared by (a) providing a plurality of nanoparticulates having an average particle size of 300 nanometers or less; (b) admixing the nanoparticulates with a solventborne water-disperable polymer or with (1) one or more polymerizable ethylenically unsaturated monomers; and/or (2) a mixture of one or more polymerizable unsaturated monomers with one or more polymers; and/or (3) one or more polymers, to form an admixture; (c) subjecting the admixture to high stress shear conditions in the presence of either an organic solvent or an aqueous medium to particularize the admixture into microparticles; and (d) optionally, polymerizing the ethylenically unsaturated monomers under free radical polymerization conditions.

L'invention concerne une dispersion aqueuse de microparticules, comprenant des nanoparticules, des procédés pour préparer ladite dispersion, ainsi que des compositions contenant de telles dispersions. Le procédé de préparation de ladite dispersion consiste à: (a) mettre à disposition une pluralité de nanoparticules présentant une taille moyenne de particule inférieure ou égale à 300 nanomètres; (b) mélanger les nanoparticules à un polymère dispersible dans l'eau, contenant un solvant, ou à (1) un ou plusieurs monomères éthyléniquement insaturés, polymérisables; et/ou à (2) un mélange d'un ou de plusieurs monomères insaturés polymérisables et d'un ou de plusieurs polymères; et/ou (3) un ou plusieurs polymères, pour former un mélange; (c) soumettre le mélange à des contraintes de cisaillement élevées en présence soit d'un solvant organique soit d'un milieu aqueux pour transformer le mélange en microparticules; et (d) éventuellement polymériser les monomères éthyléniquement insaturés dans des conditions de polymérisation radicalaire.

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