Multi-colored lustrous pearlescent pigments
US7850775B2 · kind B2 · utility
12Cited by
89References
37Claims
0Family size
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Key dates
| Filing date | Jun 20, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Aug 9, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2995
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A pearlescent pigment comprising a substrate and a first layer, wherein the first layer comprises iron oxide, wherein the iron has from about 1% to about 30% Fe(II) and from about 70% to about 99% Fe(III). A process for making these pearlescent pigment, comprise reducing a metal oxide substrate with a hydrogen source in the presence of a noble metal catalyst in a liquid medium. The pigments may be used in a variety of applications including cosmetics, plastics, automotive or architectural coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.