Patent ID: 6086668
Filing Date: 2000-07-11
Classification: C01P,C09C

Abstract:
A process for preparing metal oxide particles having a substantially uniform coating, the process comprising the steps of reacting a plurality of metal oxide particles with at least one precursor selected from the group consisting of monomeric metal oxide precursors and organofunctionalized metal oxide precursors, wherein the monomeric metal oxide precursors are selected from the group consisting of tetraalkoxysilane; SiCl.sub.4 ; Al(i-propoxide).sub.2 (acetoacetate); and Zr(alkoxide).sub.4 ; and wherein the organofunctionalized metal oxide precursors are selected from the group consisting of n-alkylalkoxysilane, wherein the n-alkyl is C.sub.1 -C.sub.16 and the alkoxy is C.sub.1 -C.sub.6 ; n-alkyltrichlorosilane wherein the n-alkyl is C.sub.1 -C.sub.16 ; and n-alkyltrialkoxysilane wherein the n-alkyl is C.sub.1 -C.sub.16 and the alkoxy is C.sub.1 -C.sub.6, with the proviso that the metal oxide of the coating is different from the metal oxide of the particles.