Very finely divided rare earth sulfide colorant compositions
US5755868A · kind A · utility
6Cited by
5References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1997 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Jun 16, 2017 |
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.