Drug – bio-affecting and body treating compositions – Inorganic active ingredient containing – Aluminum – calcium or magnesium element – or compound containing
Reexamination Certificate
2006-06-27
2006-06-27
Padmanabhan, Sreeni (Department: 1617)
Drug, bio-affecting and body treating compositions
Inorganic active ingredient containing
Aluminum, calcium or magnesium element, or compound containing
C424S401000, C424S489000, C423S625000
Reexamination Certificate
active
07067157
ABSTRACT:
Flake-like α-alumina particles having an average major diameter of 0.5 to 25 μm and an aspect ratio, expressed by particle major diameter/average thickness, of greater than 50 to 2000 and having a thin flat form. The flake-like α-alumina particles are produced by a hydrothermal synthesis process of an aqueous slurry in which the slurry comprises an alumina hydrate and/or an alumina gel, having a particle size of not more than 2 μm and a maximum size of not more than 5.0 μm and phosphoric acid ions in an amount of 1.0×10−3to 1.0×10−1mol per mol of the alumina hydrate and/or alumina gel. The flake-like α-alumina particles exhibit good dispersibility when being kneaded as fillers or pigments in rubbers or plastics or as coating agents with a resin and also can be easily dispersed as primary particles in aqueous solvent with high dispersion stability when added to an aqueous slurry of precision abrasives or cosmetics. The particles are desirable in providing cosmetics with good smoothness, tackiness to the skin and spreadability.
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Fukuda Takeshi
Shido Ryuichi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kantamneni Shobha
Kinsei Matec Co. Ltd.
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