Method for producing an aqueous dispersion of particles...

C - Chemistry – Metallurgy – 08 – F

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C08F 292/00 (2006.01) C08F 2/44 (2006.01) C08L 51/10 (2006.01)

Patent

CA 2449887

The invention relates to a method for producing an aqueous dispersion of particles (composite particles) composed of a polymer and a fine-particle inorganic solid. According to said method, at least one ethylenically unsaturated monomer is dispersed in an aqueous medium and is polymerized using at least one radical polymerization initiator in the presence of at least one dispersed, fine-particle inorganic solid and at least one anionic, cationic, non-ionic dispersent, in accordance with the radical aqueous emulsion polymerization method. In said method, a) a stable aqueous dispersion of the inorganic solid(s) is used, said dispersion being characterized in that it has an initial concentration of >= 1 wt. %, (in relation to the aqueous dispersion of the inorganic solid(s)) and that one hour after production it still retains a dispersion of 90 wt. % of the original dispersed solid, the solid particles of said stable aqueous dispersion having a diameter <= 100 nm, b) the dispersed solid particles of the inorganic solid(s) exhibit an electrophoretic mobility that is not equal to zero in a standard aqueous potassium chloride solution, at a pH value that corresponds to the pH value of the aqueous reaction medium prior to the addition of the dispersent, c) at least one anionic, cationic, non-ionic dispersent is added to the aqueous solid particle dispersion prior to the addition of the ethylenically unsaturated monomers, d) between 0.01 and 30 wt. % of the total quantity of the monomer(s) is then added to the aqueous solid particle dispersion and is polymerized up to a conversion rate of at least 90 %, e) the residue of the monomer(s) is subsequently added under polymerization conditions, according to use.

L'invention concerne un procédé de fabrication d'une dispersion aqueuse de particules composée de polymérisat et de solides anorganiques fins (particules composites). Selon ledit procédé, au moins un monomère à insaturation éthylénique est dispersé dans un milieu aqueux et polymérisé au moyen d'au moins un initiateur de polymérisation radicalaire en présence d'au moins un solide anorganique fin dispersé, et d'au moins un agent de dispersion anionique, cationique et non-ionique, selon le procédé de polymérisation d'émulsion aqueuse radicalaire. Selon l'invention, a) on met en oeuvre une dispersion aqueuse stable dudit solide caractérisée en ce qu'elle contient pour une concentration de solide initial >= 1 % en poids par rapport à la dispersion aqueuse, une heure après fabrication, plus de 90 % en poids du solide dispersé initial sous forme dispersée et que les particules présentent un diamètre <= 100 nm ; b) les particules solides dispersées présentent dans une solution de chlorure de potassium une mobilité électrophorétique non nulle avant addition de l'agent de dispersion ; c) la dispersion de particules solides est transformée avec au moins un agent de dispersion anionique, cationique et non-ionique avant addition du monomère à insaturation éthylénique ; d) 0,01 à 30 % en poids de la quantité totale du monomère sont additionnés à la dispersion de particules solides, et polymérisés jusqu'à transformation d'au moins 90 % ; et, e) la quantité restante de monomère est additionnée selon les conditions de polymérisation.

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