Process for deactivating soluble metal cations in iron oxide pigments
US4348240A · kind A · utility
3Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1980 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Dec 22, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The subject matter of this invention relates to a process for deactivating the soluble metal cations contained in iron oxide pigments comprising: PA0 A. adding, while oxidizing, an alkalizing compound to an iron oxide pigment, a slurry until the pH of the pigment slurry is greater than 9; and PA0 B. separating the iron oxide pigment from the liquid phase of the slurry. The pigments can be used as colorants for substances ingested by man and animals, and they can also be used to stabilize plastics against ultraviolet degradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.