Aqueous dispersion containing pyrogenically prepared metal oxide particles and dispersants
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United States of America Patent
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Dec 30, 2008
Grant Date -
Oct 13, 2005
app pub date -
May 14, 2003
filing date -
Jun 6, 2002
priority date (Note) -
Expired
status (Latency Note)
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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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