the present invention provides a treatment method for rendering inorganic oxide particles , such as tio 2 pigment , hydrophobic by predispersing a suitably reactive organohalosilane into an aqueous media , using intensive mixing means to form a reactive dispersion . when this dispersion is combined with inorganic oxide particles , such as tio 2 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 substances , and they do not degrade physical properties of the pigmented nonpolar substance , such as lacing resistance of thermoplastics .