Rutile (TiO.sub.2) pigments coated with (1) trigonal anhydrous alumina (Al.sub.2 O.sub.3) and (2) cubic metal aluminate (MeAl.sub.2 O.sub.4) (Me.dbd.Co, Ni, Cu, Zn, Mg) and process
US4390374A · kind A · utility
2Cited by
10References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | May 26, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to new inorganic pigments consisting or consisting essentially of a TiO.sub.2 rutile nucleus, of a first adherent coating of trigonal Al.sub.2 O.sub.3 and of a second adherent coating of cubic MeAl.sub.2 O.sub.4, in which Me is Co, Ni, Cu, Zn or Mg. These pigments are obtained by mixing TiO.sub.2 rutile particles coated with Al.sub.2 O.sub.3, with a MeO oxide or a Me compound capable of providing MeO in a subsequent calcination step, and by calcining the mixture in the presence of air at temperatures in the range of from 750.degree. to 1000.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.