Silica with a high oil absorption capability and a controlled primary structure and process for the production thereof
US4842838A · kind A · utility
27Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1987 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Jan 16, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Precipitation silicas, in the form of aggregates as shown in FIG. 1, having a mean projected area of the aggregates which is higher than about 8,000 nm.sup.2 and preferably is higher than about 15,000 nm.sup.2. The present invention also concerns a process for the production of precipitation silica by maintaining a constant-volume reaction medium to provide suitable colloids of silica, reacting the colloids with an electrolyte and consolidating the resulting product by the addition of a solution of silicate and an acidifying agent to obtain a precipitation silica.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.