Invention Grant
- Patent Title: Method for preparing precipitated silicas, novel precipitated silicas and their uses, in particular for strengthening polymers
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Application No.: US14424368Application Date: 2013-09-02
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Publication No.: US09862810B2Publication Date: 2018-01-09
- Inventor: Cèdric Boivin , Laurent Guy , Eric Perin , Kilani Lamiri
- Applicant: RHODIA OPERATIONS
- Applicant Address: FR Paris
- Assignee: Rhodia Operations
- Current Assignee: Rhodia Operations
- Current Assignee Address: FR Paris
- Priority: FR1202349 20120831
- International Application: PCT/EP2013/068106 WO 20130902
- International Announcement: WO2014/033301 WO 20140306
- Main IPC: C08K5/092
- IPC: C08K5/092 ; C01B33/12 ; C08K3/22 ; C08K3/36 ; C01B33/193

Abstract:
The present disclosure relates to a novel process for the preparation of a precipitated silica, in which: a silicate is reacted with at least one acidifying agent, so as to obtain a suspension of precipitated silica, said suspension of precipitated silica is filtered, so as to obtain a filtration cake, said filtration cake is subjected to a liquefaction operation comprising the addition of an aluminum compound, after the liquefaction operation, a drying stage is carried out, characterized in that methylglutaric acid is added to the filtration cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.
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