Molybdenum or tungsten containing bismuth vanadate yellow pigments and process for preparing same
US4316746A · kind A · utility
11Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1981 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Feb 23, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to new inorganic yellow pigments consisting or consisting essentially of Bi.sub.1-(x/3) M.sub.x V.sub.1-x O.sub.4 in which M is Mo or W. The value of x varies from 0.075 to 0.317 in the case of Mo and from 0.059 to 0.265 in the case of W. These pigments are composed of only the tetragonal crystalline phase of the scheelite type when M is Mo; when M is W, also the orthorhombic crystalline phase .gamma.Bi.sub.2 WO.sub.6 is present. These pigments may also contain a crystalline phase consisting of orthorhombic BaSO.sub.4 ; in such case the amount of BaSO.sub.4 may reach 80% by weight of the pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.