Process for the preparation of precipitated silicas having morphology similar to pyrogenic silicas
US4127641A · kind A · utility
17Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Jun 22, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A multistage precipitation and flocculation production process is disclosed in which primary silica particles are prepared and flocculated useing 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.