Precipitated silica and process for its manufacture

US11884551B2 · kind B2 · utility

Assignee

• RHODIA OPERATIONS · FR

Inventors

• Emmanuelle Allain Najman · L'Haÿ-les-Roses, FR
• Fabien Stocklouser · Francheville, FR
• Pascaline Garbey · Saint-Didier-au-Mont-d'Or, FR
• Caroline Fayolle · L'Essart Mador, FR
• Sylvaine Neveu · Paris, FR
• Laurent Guy · Sathonay-Camp, FR

Key dates

• Filing date: May 3, 2018
• Grant date: Jan 30, 2024
• Expiry date: May 3, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2201/006
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A precipitated silica having a broad particle size distribution and large median particle size as well as its method of manufacture is provided. The precipitated silica has a CTAB surface area SCTAB in the range from 40 to 300 m2/g, a difference between BET surface area SBET and CTAB surface area SCTAB of at least 35 m2/g, a width of the particle size distribution Ld, measured by centrifugal sedimentation, of at least 1.5, an amount of aluminium WA1 in the range from 0.5 to 7.0 wt %, and a median particle size d50, measured by centrifugal sedimentation, such that for a given value of CTAB surface area SCTAB and amount of aluminium WAl, parameter A, defined by the following equation: A=|d50|+0.782×|SCTAB|−8.524×|WAl|.