Redispersible powder and its aqueous dispersion, preparation...

C - Chemistry – Metallurgy – 08 – F

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C08F 2/22 (2006.01) C04B 24/26 (2006.01) C08F 2/44 (2006.01) C08J 3/16 (2006.01) C08L 57/12 (2006.01) C09D 157/12 (2006.01) C09J 157/12 (2006.01) A23L 1/03 (2006.01)

Patent

CA 2337855

The invention relates to a redispersible powder obtainable by (co)polymerization, using a polymer with cationic functionality in an aqueous medium, optionally accompanied by the use of conventional additives, the polymer with cationic functionality being obtained by (co)polymerization in an aqueous medium of olefinically unsaturated (co)monomers, wherein at least one (co)monomer has a cationic functionality, further (co)monomers are added and polymerization takes place in the presence of suitable initiators, and by drying the aqueous dispersion obtained, the (co)polymerizate having one or more reactive groups. According to another embodiment, the polymer with cationic functionality is formed in situ in the presence of a seed. According to another embodiment, the process is controlled in such a way that a (co)polymerizate particle with heterogeneous morphology is formed. The invention also relates to the aqueous dispersions, a process for the preparation of the redispersible powder and the use thereof.

L'invention porte sur une poudre redispersible s'obtenant par (co)polymérisation à l'aide d'un polymère à fonctionnalité cationique placé dans un milieu aqueux facultativement accompagné d'additifs classiques, ledit polymère s'obtenant par (co)polymérisation dans un milieu aqueux de (co)monomères non saturés en oléfines dont l'un au moins présente une fonctionnalité cationique, puis adjonction de (co)monomères, puis polymérisation en présence d'initiateurs idoines, puis séchage de la dispersion aqueuse obtenue, le (co)polymérisât présentant un ou plusieurs groupes réactifs. Dans une autre exécution, le polymère à fonctionnalité cationique se forme in situ en présence d'un germe. Dans une autre exécution, le processus est dirigé de manière à former une particule de (co)polymérisât de morphologie hétérogène. L'invention porte également sur la dispersion aqueuse, sur le procédé de préparation de la poudre redispersible et sur ses utilisations.

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