Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2007-10-02
2007-10-02
Hu, Henry S. (Department: 1713)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C523S212000, C523S216000, C524S497000, C428S530000
Reexamination Certificate
active
11135584
ABSTRACT:
The disclosure is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding an amorphous alumina-stabilizing agent, specifically an anion, such as citric acid, to an aqueous slurry of the titanium dioxide nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina-treated titanium dioxide nanoparticles; recovering the alumina-treated inorganic nanoparticles, wherein the nanoparticles have a particle size of about 50 to about 300 nm; and milling the nanoparticles to form nanoparticles having a particle size about 15% smaller than silica-treated inorganic nanoparticles milled under similar conditions. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions.
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Frerichs Scott Rickbeil
Morrison, Jr. William Harvey
Spahr Douglas Eric
E I du Pont de Nemours and Company
Hu Henry S.
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