Invention Grant
- Patent Title: Precipitated silica and process for its manufacture
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Application No.: US17291027Application Date: 2019-11-06
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Publication No.: US12145853B2Publication Date: 2024-11-19
- Inventor: Frédéric Colbeau-Justin , Emmanuelle Allain Najman , Pascaline Lauriol-Garbey
- Applicant: RHODIA OPERATIONS
- Applicant Address: FR Aubervilliers
- Assignee: RHODIA OPERATIONS
- Current Assignee: RHODIA OPERATIONS
- Current Assignee Address: FR Aubervilliers
- Agency: Osha Bergman Watanabe & Burton LLP
- Priority: EP18306461 20181108
- International Application: PCT/EP2019/080392 WO 20191106
- International Announcement: WO2020/094714 WO 20200514
- Main IPC: B01J21/08
- IPC: B01J21/08 ; A61L15/18 ; B01J20/10 ; C01B33/193 ; C08K3/36 ; B60C1/00

Abstract:
Precipitated silica having large median particle size for use as reinforcing filler in elastomeric compositions as well as its method of manufacture. In particular, a precipitated silica characterised by a CTAB surface area SCTAB in the range from 70 to 350 m2/g; an amount WM of at least one metal M selected from elements of groups 3, 4 and 5 of at least 0.1 mol %; and a median particle size d50, measured by centrifugal sedimentation, such that: |d50|≥183×|RION|×|WM|−0.67×|SCTAB|+233 (I) wherein |d50| represents the numerical value of median particle size d50 measured by centrifugal sedimentation and expressed in nm; |RION|, the numerical value of the ionic radius of metal M expressed in nm; |SCTAB|, the numerical value of the CTAB surface area SCTAB expressed in m2/g; and |WM|, the numerical value of the percentage molar amount of the metal WM.
Public/Granted literature
- US20210387858A1 PRECIPITATED SILICA AND PROCESS FOR ITS MANUFACTURE Public/Granted day:2021-12-16
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