Production of silica colloids
US5066420A · kind A · utility
32Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1987 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Aug 5, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silica colloids having a spherical form, a mean diameter of between about 10 and 100 nm and a polydispersity index between about 1 and 4. A process for making silica colloids is also provided comprising a) forming a reaction medium by simultaneously adding an acidifying agent and an alkaline silicate solution to a reaction vessel, b) reacting the acidifying agent and alkaline silicate solution, and c) maintaining a constant volume of the reaction medium by drawing off the reaction medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.