Precipitated silica and process for its manufacture

A precipitated silica characterised by:

• a CTAB surface area SCTAB equal to or greater than 160 m2/g;
• a median particle size d50, measured by centrifugal sedimentation, such that:
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• d
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• 50
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• >
• 25000
• /
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• S
• C
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• T
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• wherein:
• |d50| represents the numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm and |SCTAB | represents the numerical value of the CTAB surface area SCTAB expressed in m2/g;
• -an aluminium content not exceeding 4500 ppm;
• and
• -a width of the particle size distribution Ld, measured by centrifugal sedimentation, of at least 1.2.

A precipitated silica characterised by:

• a CTAB surface area SCTAB equal to or greater than 160 m2/g;
• a median particle size d50, measured by centrifugal sedimentation, that does not exceed 250 nm and that is such that:
• ❘
• "\[LeftBracketingBar]"
• d
• ⁢
• 50
• ⁢
• ❘
• "\[LeftBracketingBar]"
• >
• 25000
• /
• ❘
• "\[LeftBracketingBar]"
• S
• C
• ⁢
• T
• ⁢
• A
• ⁢
• B
• ❘
• "\[RightBracketingBar]"
• (
• I
• )
• wherein:
• |d50| represents the numerical value of the median particle size d50 measured by centrifugal sedimentation and expressed in nm and |SCTAB | represents the numerical value of the CTAB surface area SCTAB expressed in m2/g;
• and
• an aluminium content not exceeding 4500 ppm.