Abstract: The invention provides a method for preparing a dry titanium dioxide product, comprising the steps of: providing a dispersion comprising titanium dioxide particles; treating the titanium dioxide particles with a silane of formula (I): RII(ORI)aORSiX3??(I) wherein R is a divalent C1-24 organic group that is carbon-bonded to the silicon atom, RI is a C2-6 alkylene group, RII is hydrogen, a C1-16 alkyl group, a C2-16 alkyl ether group, or a C2-12 acyloxy group, X is a hydrolysable group, and a is a number having a value from 3 to 150; and then drying the dispersion to provide a dry titanium dioxide product. The dry titanium dioxide product may optionally be dispersed within a vehicle.

Abstract: The invention provides a method for preparing a dry titanium dioxide product, comprising the steps of: providing a dispersion comprising titanium dioxide particles; treating the titanium dioxide particles with a silane of formula (I): RII(ORI)aORSiX3??(I) wherein R is a divalent C1-24 organic group that is carbon-bonded to the silicon atom, RI is a C2-6 alkylene group, RII is hydrogen, a C1-16 alkyl group, a C2-16 alkyl ether group, or a C2-12 acyloxy group, X is a hydrolysable group, and a is a number having a value from 3 to 150; and then drying the dispersion to provide a dry titanium dioxide product. The dry titanium dioxide product may optionally be dispersed within a vehicle.

Abstract: The invention provides a method for preparing a titanium dioxide product, comprising the steps of: providing a dispersion comprising titanium dioxide particles, wherein the dispersion contains from 50 g/l to 600 g/l TiO2; and then, in any order, applying an inorganic coating to the titanium dioxide particles, whilst maintaining colloidal stability before and/or during the coating step; concentrating the dispersion, by subjecting the dispersion to the effects of cross-flow filtration and continuing the cross-flow filtration process until the dispersion is in a concentrated form that contains 800 g/l or more TiO2; so as to provide a titanium dioxide product in the form of a concentrated dispersion of coated particles. The concentrated dispersion of coated particles may optionally be dispersed within a vehicle to obtain a pigment product.