Multi-layer effect pigment
US7993444B2 · kind B2 · utility
12Cited by
9References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2006 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Nov 4, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09C2200/303
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A multilayer effect pigment includes a transparent substrate, a layer of high refractive index material on the substrate, and alternating layers of low refractive index and high refractive index materials on the first layer, the total number of layers being an odd number of at least three, all adjacent layers differing in refractive index by at least about 0.2 and at least one of the layers having an optical thickness which is different from all of the other layers. The resulting multilayer effect pigment is not a quarter-wave stack. The present effect pigments may be used in cosmetic and industrial applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.