Lower-energy process for preparing passivated inorganic...

Details Lower-energy process for preparing passivated inorganic... Lower-energy process for preparing passivated inorganic...

C - Chemistry, Metallurgy

09

C

C09C 3/06 (2006.01) A61K 8/29 (2006.01) A61Q 17/04 (2006.01) C09D 5/33 (2006.01)

Patent

CA 2546309

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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