Cosmetics, silica-coated metal oxide powder and production method therefor
US6235270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1998 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Apr 20, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Cosmetics comprising silica-coated metal oxide powder having a thickness of the silica coating of 0.1 to 100 nm, and a photocatalytic activity as measured by tetralin auto-oxidation method of 6 mmH.sub.2 O/min or less. Silica-coated metal oxide powder coated with a silica coating having an absorption peak intensity ratio I (I=I.sub.1 /I.sub.2, wherein I.sub.1 is an absorption peak intensity at 1,150 to 1,250 cm.sup.-1 and I.sub.2 is an absorption peak intensity at 1,000 to 1,100 cm.sup.-1) between the infrared absorption spectra in the region of 1,150 to 1,250 cm.sup.-1 and the region of 1,000 to 1,100 cm.sup.-1 of 0.2 or more, and having a refractive index of 1.435 or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.