Aqueous dispersion containing pyrogenically prepared metal...

Details Aqueous dispersion containing pyrogenically prepared metal... Aqueous dispersion containing pyrogenically prepared metal...

2003-05-14

2008-12-30

Eashoo, Mark (Department: 1796)

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

C424S489000, C424S641000

Reexamination Certificate

active

07470423

ABSTRACT:
An aqueous dispersion containing 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, that the particle sizes of the oxide particles in the dispersion are not distributed symmetrically and the dispersion contains, as a dispersant, at least one compound of the formula (I) and/or a maleic anhydride/acrylate copolymer of the general formula (IIa) and/or a maleate/acrylate copolymer of the general formula (IIb). It is prepared by dispersing a predispersion stream by means of a high energy mill. It can be used in sunscreen formulations.

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