Patent ID: 6808769
Filing Date: 2004-10-26
Classification: B41M,C09D,Y10T

Abstract:
A stable, aqueous dispersion comprising 20 to 80 wt. %, relative to the total amount of dispersion, of one or more metal oxide powders and/or one or more non-metal oxide powders,wherein said metal oxide powders and/or non-metal oxide powders are in the form of aggregates of primary particles, whereby the average diameter of the aggregates is 10 nm to 300 nm and the average diameter of the primary particles is 5 to 50 nm, whereinthe dispersion comprises at least two types of powder, wherein the powder types at a given pH of the dispersion display the same surface charge and have a zeta potential that gives rise to an electrostatic repulsion between the particles that is greater than the van der Waals attraction between the powders and the average diameters of the primary particles differ by a factor of at least 1.5 between two powder types and in the dispersion the average aggregate diameter of the second and additional powder types is 60 to 150% of the size of the first powder type and each powder type is present in the dispersion in a quantity of at least 1 wt. %.