Patent ID: 7704315
Filing Date: 2010-04-27
Classification: B82Y,C04B

Abstract:
1. An aqueous dispersion comprising a metal oxide powder comprising a fine fraction and a coarse fraction, wherein the metal oxide powder is silicon dioxide, aluminum oxide, titanium dioxide, zirconium dioxide, cerium oxide or a mixed oxide of two or more of the said metal oxides, the fine fraction is present in aggregated form and has a mean aggregate diameter in the dispersion of less than 200 nm, the coarse fraction consists of particles with a mean diameter of 1 to 20 μm, a weight ratio of the fine fraction to the coarse fraction is 2:98 to 30:70, and a content of the metal oxide powder is 50 to 85 wt. %, referred to the total amount of the dispersion, and wherein (i) the fine fraction and the coarse fraction comprise different metal oxides, or (ii) if both the fine fraction and the coarse fraction comprise the same metal oxide, said metal oxide is at least one oxide selected from the group consisting of aluminum oxide, titanium dioxide, zirconium dioxide, and cerium oxide.