Very finely divided rare earth sulfide colorant compositions
US5968247A · kind A · utility
5Cited by
5References
6Claims
0Family size
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Inventor
Key dates
| Filing date | Feb 25, 1998 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Feb 25, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K9/02
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Unique colorant compositions, well suited for the pigmentation of a wide variety of coatings and substrates, e.g., cosmetics, plastics, paints and rubbers, comprise (1) at least one crystalline rare earth metal sulfide or sesquisulfide, for example cubic cerium sesquisulfide Ce.sub.2 S.sub.3, and (2) a dopant amount of at least one alkali metal, and wherein the at least one rare earth metal sulfide or sesquisulfide comprises whole (unground) monocrystalline grains thereof having a mean particle size of at most 1.5 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.