	US 12,145,853 B2
	Precipitated silica and process for its manufacture
Frédéric Colbeau-Justin, Collonges au Mont d'Or (FR); Emmanuelle Allain Najman, L'Hay les Roses (FR); and Pascaline Lauriol-Garbey, Saint-Cyr-au-Mont-d'Or (FR)
Assigned to RHODIA OPERATIONS, Lyons (FR)
Appl. No. 17/291,027
Filed by RHODIA OPERATIONS, Aubervilliers (FR)
PCT Filed Nov. 6, 2019, PCT No. PCT/EP2019/080392 § 371(c)(1), (2) Date May 4, 2021, PCT Pub. No. WO2020/094714, PCT Pub. Date May 14, 2020.
Claims priority of application No. 18306461 (EP), filed on Nov. 8, 2018.
Prior Publication US 2021/0387858 A1, Dec. 16, 2021
Int. Cl. B01J 21/08 (2006.01); A61L 15/18 (2006.01); B01J 20/10 (2006.01); C01B 33/193 (2006.01); C08K 3/36 (2006.01); B60C 1/00 (2006.01)

CPC C01B 33/193 (2013.01) [A61L 15/18 (2013.01); B01J 20/103 (2013.01); B01J 21/08 (2013.01); C08K 3/36 (2013.01); B60C 1/00 (2013.01); C01P 2004/51 (2013.01); C01P 2006/12 (2013.01); C01P 2006/80 (2013.01); C08K 2201/006 (2013.01)]

16 Claims

1. A precipitated silica comprising:

a CTAB surface area S_CTABin the range from 70 to 350 m²/g;

an amount W_Mof at least one metal M selected from the group consisting of the 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 (I):

|d50|≥183×|R_ION|×|W_M|−0.67×|S_CTAB|+233 (I)

wherein:

|d50| represents the numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm; |R_ION| represents the numerical value of the ionic radius of the at least one metal M selected from the group consisting of the elements of groups 3, 4, and 5 expressed in nm; |S_CTAB| represents the numerical value of the CTAB surface area S_CTABexpressed in m²/g; and |W_M| represents the numerical value of the percentage molar amount of the metal W_M,

wherein the width of the particle size distribution Ld, measured by centrifugal sedimentation, is from 1.2 to 3.5.