US 7,572,854 B2
	Dispersion of aluminium oxide
Gerrit Schneider, Hanau (Germany); Heinz Lach, Gelnhausen (Germany); and Thomas Scharfe, Alzenau (Germany)
Assigned to Degussa AG, Fed Rep (Germany)
Filed on Oct. 22, 2002, as Appl. No. 10/277,130.
Claims priority of application No. 101 52 745 (DE), filed on Oct. 25, 2001.
Prior Publication US 2003/0124321 A1, Jul. 03, 2003
Int. Cl. C08K 3/18 (2006.01); D06M 15/263 (2006.01)

U.S. Cl. 524—430  [252/8.62]

3 Claims

1. A process for the production of aluminium oxide dispersions, comprising mixing a high-surface-area, pyrogenically-produced aluminium oxide, having a BET specific surface area of more than 115 m2/g and a Sears number of more than 8 ml/2 g, with water and one or more of the components selected from the group consisting of inorganic acids, organic acids, inorganic bases, organic bases, salts, buffer systems, ionic surfactants, non-ionic surfactants, polyelectrolytes, polymers, dispersing agents, stabilizers and biocides, setting a pH value of 2 to 8 with acid, and subjecting the mixture to controlled shearing forces for a period of about 45 minutes or more sufficient to form a dispersion havng a mean particle size distribution of d50<150 nm.