Pigments and their preparation by coating with oxides of Zr-Si-Al
US4447270A · kind A · utility
32Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | May 8, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Titanium dioxide pigment of improved durability in paints comprises a particulate core of rutile titanium dioxide having an inner coating on the core of an oxide or hydrous oxide of zirconium, and a coating of dense amorphous silica on the inner coating. The pigment optionally has an outer coating of a hydrous oxide of aluminium. The pigments contain the oxide of hydrous oxide of zirconium in an amount of up to 5% expressed as ZrO.sub.2 and an amount of dense amorphous silica of up to 12% by weight expressed as SiO.sub.2 on the weight of TiO.sub.2. The pigments when incorporated in paints have extremely high durability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.