Method for producing aqueous dispersions of (co)polymers,...

C - Chemistry – Metallurgy – 08 – F

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C08F 265/04 (2006.01) A01N 25/10 (2006.01) A61K 9/20 (2006.01) B01D 15/08 (2006.01) C04B 24/26 (2006.01) C08F 2/28 (2006.01) C08F 285/00 (2006.01) C08F 291/00 (2006.01) C08L 51/00 (2006.01) C08L 57/00 (2006.01) C09D 1/08 (2006.01) C09D 151/00 (2006.01)

Patent

CA 2338095

The invention relates to a method for producing aqueous dispersions of (co)polymers using a polymer with cationic functionality, optionally with the addition of the usual additives. The polymer with cationic functionality is obtained by (co)polymerising olefinically unsaturated (co)monomers in an aqueous medium, at least one of said (co)monomers having a cationic functionality. Other (co)monomers are added and the polymerisation is carried out in the presence of suitable initiators. The polymers and/or (co)monomers are chosen and the method is controlled in such a way that a (co)polymer particle is formed with heterogeneous morphology and the resulting dispersed (co)polymer has a glass transition temperature Tg of more than approximately 50 ~C. The invention also relates to a method for forming the polymer with cationic functionality in the presence of a seed in situ, and to redispersible powders and their use.

L'invention concerne un procédé de production permettant de produire des dispersions aqueuses de (co-)polymères. Ce procédé consiste à : utiliser un polymère de fonction cationique et éventuellement des additifs usuels. Le polymère de fonction cationique est obtenu par (co-)polymérisation dans un milieu aqueux de (co-)monomères oléfiniquement insaturés, au moins un (co-)monomère présentant une fonction cationique. Ce procédé consiste ensuite à ajouter d'autres (co-)monomères et à effectuer la polymérisation en présence d'initiateurs appropriés. Les polymères et/ou les (co-)monomères sont sélectionnés et le procédé est mis en oeuvre de telle façon qu'une particule de (co-)polymère a une morphologie hétérogène et le (co-)polymère dispersé obtenu a une température de transition vitreuse Tg de plus d'environ 50 ·C. L'invention concerne également un procédé selon lequel le polymère de fonction cationique est formé en présence d'une semence in situ. L'invention concerne enfin des poudres redispersibles ainsi que leur utilisation.

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