Preparation of polymer particles

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 77/06 (2006.01) B01J 20/26 (2006.01) B01J 20/30 (2006.01) C08F 2/32 (2006.01) C08F 2/44 (2006.01) C08K 3/22 (2006.01) C08L 83/06 (2006.01)

Patent

CA 2452407

A process for the preparation of polymer magnetic particles, which comprises: (a) providing a water phase containing magnetic components homogeneously dispersed therein; (b) wherein the water phase is contacted with or further contains a polymerisable metal-containing or organic monomer which is soluble in the water phase; and (c) polymerising the monomer in the presence of the magnetic in which the magnetic components are substantially uniformly distributed; wherein at least a part of the polymerising step (c) is carried out in a water-in-oil emulsion in which the water phase containing the magnetic components homogeneously dispersed therein is present as a discontinuous phase in a continuous oil phase.

L'invention se rapporte à un procédé de préparation de particules magnétiques polymères consistant : (a) à fournir une phase aqueuse contenant des composants magnétiques dispersés de manière homogène, (b) à mettre la phase aqueuse en contact avec un monomère organique ou contenant un métal polymérisable soluble dans la phase aqueuse, cette phase aqueuse contenant le cas échéant ledit monomère ; et (c) à polymériser le monomère en présence des composants magnétiques de manière à former des particules magnétiques polymères dans lesquelles les composants magnétiques sont sensiblement répartis uniformément ; au moins une partie de l'étape de polymérisation (c) étant réalisée dans une émulsion inverse dans laquelle la phase aqueuse contenant les composants magnétiques répartis de manière homogène est présente sous la forme d'une phase discontinue dans une phase huileuse continue.

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