Fine silicas
US3954944A · kind A · utility
16Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1973 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Mar 8, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention discloses a new form of wet precipitated silica which is characterised in terms of energy required to breakdown particles and a defined thickening effect. A multistage precipitation and flocculation production process is also disclosed in which primary silica particles are prepared and flocculated using an alkali metal salt solution and further silica precipitated in the presence of the salt, the pH of the mixture reduced and the silica isolated, purified carefully dried and optionally milled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.