Polymer powders redispersible in aqueous solution

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/12 (2006.01) A01N 25/14 (2006.01) A61K 8/81 (2006.01) A61K 9/28 (2006.01) A61K 9/32 (2006.01) A61K 47/30 (2006.01) A61K 47/32 (2006.01) A61Q 1/12 (2006.01) C08J 3/03 (2006.01)

Patent

CA 2253798

Polymer powders redispersible in aqueous solution, their use in cosmetic, pharmaceutical or plant-protection preparations and a process for producing polymer powders redispersible in aqueous solution, containing free acid or basic group-bearing copolymers and possibly auxiliaries, in which the pH of the dispersion is adjusted by the addition of at least one buffer system before drying at 2.0 to 6.5 in the case of acid group-bearing copolymers and at 7.5 to 12 in the case of basic group-bearing copolymers.

L'invention concerne des poudres polymères redispersibles en solution aqueuse, leur utilisation dans des préparations cosmétiques ou pharmaceutiques, ou encore, phytosanitaires, ainsi qu'un procédé de fabrication des poudres précitées renfermant des copolymères porteurs de groupes acides ou basiques libres et, éventuellement, des produits auxiliaires, caractérisé en ce qu'on ajuste, avant séchage, le pH de la dispersion, par addition d'au moins un système tampon, à une valeur comprise entre 2,0 et 6,5, dans le cas de copolymères porteurs de groupes acides, et à une valeur comprise entre 7,5 et 12, dans le cas de copolymères porteurs de groupes basiques.

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