Method of preparing precipitated silicas, novel precipitated silicas, and their uses, in particular for reinforcing polymers
US11168204B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2015 |
| Grant date | Nov 9, 2021 |
| Priority date | — |
| Expiry date | Feb 12, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a novel process for preparing a precipitated silica, in which:a silicate is reacted with an acidifying agent, so as to obtain a suspension of precipitated silica,said suspension of precipitated silica is filtered, so as to obtain a filter cake,said filter cake is subjected to a liquefaction operation comprising the addition of an aluminum compound,after the liquefaction operation, a drying step is performed, characterized in that at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation. The invention also relates to novel precipitated silicas and to uses thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.