Process for the preparation of precipitated silicas, precipitated silicas and their uses, in particular for the reinforcement of polymers
US11136462B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Feb 12, 2015 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Feb 12, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/025
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.