PROCEDE DE FABRICATION DE PARTICULES DE DIOXYDE DE TITANE ENROBEES, PARTICULES DE DIOXYDE DE TITANE ENROBEES ET PRODUITS COMPRENANT LESDITES PARTICULES
The present disclosure provides a method for manufacturing pigmentary titanium dioxide particles coated with SiO2 coating layer. The method comprises the steps of (i) forming an aqueous dispersion containing rutile titanium dioxide particles having an average particle size of in the range of 71000 nm, (ii) introducing to said dispersion of step (i) a silicon containing compound and a base, (iii) adding to the dispersion obtained from step ii acid, (iv) repeating the steps ii and iii at least once. Finally, the pH of the dispersion is lowered to a value within the range from 1.9 to 9.0 before filtering and washing thus obtained product.
