发明名称 |
Lower-energy process for preparing passivated inorganic nanoparticles |
摘要 |
<p>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.</p> |
申请公布号 |
EP1726625(A1) |
申请公布日期 |
2006.11.29 |
申请号 |
EP20060009814 |
申请日期 |
2006.05.12 |
申请人 |
E.I. DUPONT DE NEMOURS AND COMPANY |
发明人 |
RICKBEIL FRERICHS, SCOTT;MORRISON, WILLIAM HARVEY, JR.;SPAHR, DOUGLAS ERIC |
分类号 |
C09C3/00;C08K3/00;C08K9/02 |
主分类号 |
C09C3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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