Processes for preparing hydrophobic inorganic oxide pigments

Details Processes for preparing hydrophobic inorganic oxide pigments Processes for preparing hydrophobic inorganic oxide pigments

C - Chemistry, Metallurgy

09

C

C09C 1/36 (2006.01) C09C 3/12 (2006.01)

Patent

CA 2390657

The present invention provides a treatment method for rendering inorganic oxide particles, such as TiO2 pigment, hydrophobic by predispersing a suitably reactive organohalosilane into an aqueous media, using intensive mixing means (such as a rotor stator emulsifier or inline static mixer) to form a reactive dispersion. When this dispersion is combined with inorganic oxide particles, such as TiO2 pigment, under sufficient agitation, a hydrophobic inorganic oxide can be formed. The oxides formed by the present invention have good mechanical properties, such as dispersibility in nonpolar substance (i.e., plastics), and they do not degrade physical properties of the pigmented nonpolar substance, such as lacing resistance of thermoplastics.

L'invention concerne un traitement destiné à rendre hydrophobes des particules d'oxyde inorganique, tel qu'un pigment TiO2, en prédispersant un organohalosilane réagissant de manière adéquate dans un milieu aqueux par l'intermédiaire de moyens de mélange intensif (notamment un émulsionneur muni d'un rotor-stator ou un mélangeur statique en ligne) de manière à obtenir une dispersion réactive. Lorsque cette dernière est combinée, sous l'effet d'une agitation suffisante, à des particules d'oxyde inorganique, telles qu'un pigment TiO2, on peut obtenir un oxyde inorganique hydrophobe. Les oxydes ainsi obtenus présentent de bonnes propriétés mécaniques, notamment leur capacité de dispersion dans les substances non polaires (les plastiques, par exemple), et n'affectent pas les propriétés physiques de la substance non polaire pigmentée, telle que la résistance à la formation de porosités des thermoplastiques.

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