Patent ID: 7470423
Filing Date: 2008-12-30
Classification: A61K,A61Q,B82Y,C01P,C09C

Abstract:
1. An aqueous dispersion comprising pyrogenically prepared oxide particles of titanium, zinc, iron or cerium with an average particle size, expressed as the median, in the dispersion of less than 250 nm, wherein the particle sizes of the oxide particles in the dispersion are not distributed symmetrically and the dispersion comprises, as a dispersant, at least one compound of the general formula I wherein R represents an optionally branched, optionally multiple bond- and optionally hydroxyl group-comprising alkyl group with 6 to 22 carbon atoms, A represents an ethylene group, propylene group, iso-propylene group or butylene group, M represents H, an alkali metal or an ammonium ion, a is 0 to 30, b is 0 to 2, and at least one copolymer of the general formula IIa  and optionally at least one copolymer of the general formula IIb wherein, for IIa and IIb M represents hydrogen, a monovalent or divalent metal cation, an ammonium ion or an organic amine group, a is 1 or, in the event that M is a divalent metal cation, a=0.5 , X represents either —OM Y represents O, NR A m is 10 to 30, n is 0 to 50, k is 10 to 30, wherein the sum m+k is within the range 20 to 60.