Patent ID: 11884551
Assignee: RHODIA OPERATIONS
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 15:
16. The precipitated silica according to claim 15, characterised by:
the CTAB surface area SCTAB in the range from 110 to 300 m2/g;
the difference between the BET surface area SBET and the CTAB surface area SCTAB in the range from 50 to 300 m2/g;
the width of the particle size distribution Ld, measured by centrifugal sedimentation, in the range from 1.5 to 2.5;
the amount of aluminium WAl in the range from 0.8 to 3.0 wt %; and
the median particle size d50 measured by centrifugal sedimentation is equal to or greater than 65 nm, and does not exceed 300 nm, wherein the median particle size d50, the CTAB surface area SCTAB and the amount of aluminium WAl are such that parameter A defined by equation (I):

A=|d50|+0.782×|SCTAB|−8.524×|WAl|  (I)

satisfies relationship (II):

259≤A≤300  (II)

wherein:
|d50| represents the numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm; |SCTAB| represents the numerical value of the CTAB surface area SCTAB expressed in m2/g; and |WAl| represents the numerical value of the amount of aluminium WAl.