Inorganic pigments and method for preparing same
US4230500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1979 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Aug 22, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2002/72
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
There are disclosed new greenish-yellow, yellow and orange-yellow pigments which consist substantially of bismuth vanadate of monoclinic structure, bismuth phosphate of monoclinic structure and aluminum phosphate of orthorhombic structure and which, in the case of the yellow and orange-yellow pigments, also comprise a compound based on Bi.sub.2 O.sub.3 and V.sub.2 O.sub.5 the X-rays diffraction pattern of which shows the following peaks: 1.87, 1.88, 2.41, 2.77, 2.80, 3.11, 3.82 and 7.6 A. The new pigments are characterized by a dominant wave length .lambda..sub.D of from 573 to 586 m.mu., and have a molar ratio of Bi.sub.3 O.sub.3 /P.sub.2 O.sub.5 equal to 1, and a Bi.sub.2 O.sub.3 /V.sub.2 05 molar ratio of from 1.39 to 5.59, inclusive, while their molar ratio Al.sub.2 O.sub.3 /V.sub.2 O.sub.5 lies within specified ranges of values. Also disclosed is a method for preparing the new pigments by calcining, in the presence of air, BiPO.sub.4, Al.sub.2 O.sub.3 and V.sub.2 O.sub.5 or compounds which generate Al.sub.2 O.sub.3 and V.sub.2 O.sub.5 during the calcination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.