Precipitated silicas

Details Precipitated silicas Precipitated silicas

1998-09-21

1999-12-14

Straub, Gary P.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C01B 3312

Patent

active

060013222

ABSTRACT:
Precipitated silica particulates suited for homogeneous incorporation, dispersion and distribution within vulcanized elastomeric matrices reinforced therewith can be formed as either a powder, substantially spherical beads, or granulates. The silica particulates have a CTAB specific surface ranging from 100 to 140 m.sup.2 /g, a median diameter .phi..sub.50, after ultrasonic disintegration, less than 2.8 .mu.m, an ultrasonic disintegration factor F.sub.D greater than 3 ml, a BET specific surface ranging from 100 to 200 m.sup.2 /g, a mean particle size greater than 15 .mu.m when formed as a powder, at least 80 .mu.m when formed a s substantially spherical beads, and at least 1 mm when formed as a granulate, a packing density in the tamped state of at least 0.17, and a DOP oil uptake ranging from 150 to 400 ml/100 g.

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