Patent ID: 6620234
Filing Date: 2003-09-16
Classification: C01P,C09C

Abstract:
A process for preparing hydrophobic titanium dioxide comprising the steps of:(i) mixing a reactive silane having a formula RnSiX4âˆ’n wherein R represents a saturated or unsaturated branched or unbranched alkyl, aryl, cycloalkyl or alkylaryl group having 1 to 20 carbon atoms, X represents a halogen and n=1 or 2, with an aqueous media so that the reactive silane substantially condenses and forms a reactive aqueous dispersion, (ii) mixing the resulting aqueous dispersion with a slurry of titanium dioxide in water to produce an admixture, (iii) forming a hydrophobic coating on the titanium dioxide through a chemical reaction between the titanium dioxide and the dispersion, and (iv) washing, drying and micronizing said titanium dioxide and said dispersion to form a hydrophobic titanium dioxide.