Multi-colored lustrous pearlescent pigments and process for making
US8211224B2 · kind B2 · utility
1Cited by
94References
20Claims
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Key dates
| Filing date | Oct 31, 2007 |
| Grant date | Jul 3, 2012 |
| Priority date | — |
| Expiry date | Apr 14, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09C2200/407
- 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.