Particulate uv protection agent
AssigneesSachtleben Chemie GmbH, Merck Patent GmbH
InventorsFrank PFLUECKER, Bernd HIRTHE
Life of this patent
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Abstract
The present invention relates to particulate UV protection agents which are obtainable by hydrothermal treatment of a particulate metal oxide and subsequent application of a manganese oxide coating, and to the preparation and use thereof. The present invention furthermore relates to novel compositions, in particular for topical application, which are intended, in particular, for light protection of the skin and/or hair against UV radiation and free-radical-induced stress, and to the use thereof in the above-mentioned cosmetic application.
Claims14
1-36. (canceled)
A UV protection agent, where the UV protection essentially emanates from a particulate metal oxide, comprising a particulate metal oxide, which is titanium dioxide,
- wherein
- the crystallite size of the particulate titanium dioxide in the particulate UV protection agent, determined by the Scherrer method, is 8 to 50 nm, and the dimensions of the particulate titanium dioxide, which can be determined in a transmission electron microscope, are a length of 20 to 60 nm and a width of 8 to 30 nm, and
- the titanium dioxide carries a first coating consisting essentially of aluminum compounds and a second coating consisting essentially of one or more manganese compounds.
A method for the stabilization of a self-tanning agent, comprising adding to said self-tanning agent a particulate metal oxide prepared by a process comprising
- a) subjecting a particulate titanium dioxide to hydrothermal treatment and
- b) subsequently applying a first coating consisting essentially of aluminum compounds and a second coating consisting essentially of one or more manganese compounds.
A method of UV protection in a product selected from the group consisting of paints, coating systems, films, packaging, fibres, textiles, tires, insulators, rubber mouldings and silicone rubber mouldings, comprising formulating said product with a particulate metal oxide prepared by a process comprising
- a) subjecting a particulate titanium dioxide to hydrothermal treatment and
- b) subsequently applying a first coating consisting essentially of aluminum compounds and a second coating consisting essentially of one or more manganese compounds.
Dependencies are inferred from the claim text.