Precipitated silica and process for its manufacture

A precipitated silica characterised by:

• a CTAB surface area SCTAB in a range from 70 to 300 m2/g;
• a difference between a BET surface area SBET and the CTAB surface area SCTAB in a range from 35 to 300 m2/g;
• a width of a particle size distribution Ld, measured by centrifugal sedimentation, in a range from 1.5 to 3.5;
• an amount of aluminium WAl in a range from 0.5 to 5.0 wt %;
• and
• a median particle size d50 measured by centrifugal sedimentation is greater than 30 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):
• A≥253 and A≤300 (II)
• wherein:
• |d50| represents a numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm;
• |SCTAB| represents a numerical value of the CTAB surface area SCTAB expressed in m2/g;
• and |WAl| represents a numerical value of e the amount of aluminium WAl.