Method of preparing metal oxide slurries
US4115144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1976 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Dec 2, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A high solids metal oxides coated titanium dioxide aqueous slurry requires a negative charge and a high pH for use in aqueous paint media. A hot ageing of the coated titanium dioxide can alter the isoelectric point of the slurry and make practicable the avoidance of mixtures of metal oxide coating agents which give rise to processing difficulties and the use of mixtures of metal oxides which would not without the hot ageing step give suitable charge and pH characteristics. An example of a suitable mixture of metal oxide coating agents is a 1:1 molar Al.sub.2 O.sub.3 : TiO.sub.2 mixture. An example of hot ageing conditions is the use of a temperature of 98.degree. C - 100.degree. C for 1 hour while avoiding loss of water and under alkaline conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.