C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 2/22 (2006.01) A01N 25/04 (2006.01) A61K 47/32 (2006.01) C04B 24/26 (2006.01) C08F 2/24 (2006.01) C08F 2/28 (2006.01) C08F 212/06 (2006.01) C08F 257/00 (2006.01) C08F 291/00 (2006.01) C08J 3/02 (2006.01) C08J 3/12 (2006.01) C08L 9/10 (2006.01) C08L 25/02 (2006.01) C08L 101/00 (2006.01) C08L 101/12 (2006.01) C09D 5/02 (2006.01) C09D 157/00 (2006.01) C09D 157/04 (2006.01) C09J 109/00 (2006.01) C09J 157/00 (2006.01) C09J 157/04 (2006.01) C08F 210/02 (2006.01) C08F 212/08 (2006.01) C08F 212/12 (2006.01) C0
Patent
CA 2337893
The invention relates to a process for the preparation of aqueous dispersions of latex particles having a heterogeneous morphology by a semicontinuous emulsion polymerization, comprising the emulsion polymerizing of ethylenically unsaturated (co)monomers, accompanied by the addition of cationic and/or anionic and/or nonionic emulsifiers and/or protective colloids as stabilizers, which are directly used as such or synthesized in situ, the semicontinuous emulsion polymerization being performed in the presence of the stabilizer or stabilizers with a monomer mixture, which a) contains at least one nonionic, ethylenically unsaturated monomer with a glass transition temperature Tg above about 30 ~C in a quantity of about 10 to 70 wt.%, based on the total weight of ethylenically unsaturated (co)monomers and b) at least one hydrophilic, ethylenically unsaturated monomer in a quantity of about 5 to 30 wt.%, based on the total weight of ethylenically unsaturated (co)monomers.
L'invention porte sur un procédé de préparation de dispersions aqueuses de particules de latex de morphologie hétérogène par polymérisation semi-continue de l'émulsion consistant à polymériser une émulsion de co-monomères non saturés en éthylène, puis à ajouter des émulsifiants cationiques et/ou anioniques et/ou non ioniques et/ou des colloïdes protecteurs comme stabilisateurs directement utilisés comme tels ou synthétisés in situ, la polymérisation semi-continue de l'émulsion s'effectuant en présence du ou des stabilisateurs et d'un mélange de monomères comprenant: (1) au moins un monomère non ionique non saturé en éthylène à température de transition vitreuse Tg supérieure à environ 30 ·C, à raison de 10 à 70 % en poids des co-monomères non saturés en éthylène; et (2) au moins un monomère hydrophile à raison de 5 à 30 % en poids des co-monomères non saturés en éthylène.
Koelliker Robert
Willimann Hongli
Elotex Ag
Robic
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