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US 6,187,438 B1Granted
Titanium dioxide particles, method for their preparation and their use in cosmetics, varnish and surface coating
AssigneeRhodia Chimie
InventorsThierry Chopin, Dominique Dupuis, Bernard Pacaud
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Abstract
The invention concerns titanium dioxide particles coated at least partially: with a first layer of at least a cerium and/or iron compound, and a second layer of at least a metal oxide, hydroxide or oxohydroxide, the said particles having a BET specific surface area of at least 70 m2/g and a density of 2.5. The invention also concerns a method for preparing these particles and their use as anti-UV agent.
Claims20
Anatase titanium dioxide particles with a size of at most 100 nm, wherein said particles are at least partially covered:
- with a first layer of at least one cerium and/or iron compound, and
- with a second layer of at least one metal oxide, hydroxide or hydroxide oxide,
- and wherein these particles exhibit a BET specific surface of at least 70 m2/g and a relative density of the order of 2.5.
Dependencies are inferred from the claim text.