US 12,291,459 B2
Precipitated silica and process for its manufacture
Pascaline Garbey, Saint-Cyr-au-Mont-d'Or (FR); Frédéric Colbeau-Justin, Leuville-sur-Orge (FR); and Laure Bertry, Aubervilliers (FR)
Assigned to RHODIA OPERATIONS, Paris (FR)
Appl. No. 17/618,904
Filed by RHODIA OPERATIONS, Aubervilliers (FR)
PCT Filed Jun. 23, 2020, PCT No. PCT/EP2020/067464
§ 371(c)(1), (2) Date Dec. 14, 2021,
PCT Pub. No. WO2020/260262, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19305861 (EP), filed on Jun. 27, 2019.
Prior Publication US 2022/0306480 A1, Sep. 29, 2022
Int. Cl. C01B 33/193 (2006.01)
CPC C01B 33/193 (2013.01) 11 Claims
 
1. A precipitated silica comprising units of formula [SiO4/2] and units of formula [(CH3)SiO3/2], wherein the 13C NMR spectrum of the precipitated silica exhibits two resonance peaks assigned to the methyl group: a first peak in the region between −2.0 and −5.0 ppm and a second peak in the region between −5.5 and −9.0 ppm and wherein the ratio (intensity of the second peak)/(intensity of the first peak) is greater than 0.40 and wherein the precipitated silica comprises a median particle size d50 and a CTAB (cetyltributylammonium bromide) surface area such that |d50|>164.5−0.3*|CTAB| wherein |CTAB| represents the numerical value of the CTAB surface area expressed in m2/g and |d50| represents the numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm, wherein the CTAB surface area ranges from 40 to 600 m2/g.