Patent ID: 6146454
Filing Date: 2000-11-14
Classification: C01B,C01P,C08K,C09C

Abstract:
A precipitated silica having:a CTAB specific surface of between 90 and 250 m.sup.2 /g,a BET specific surface of between 90 and 250 m.sup.2 /g,a DOP oil uptake lower than 300 ml/100 g,a zinc content of between 1 and 5% by weight,said silica being in the form of spherical beads with a mean size of at least 80 .mu.m, a powder with a mean size of at least 15 .mu.m, or granules having a length of at least 1 mm along the axis of their larger dimension, andwherein the number N of stearic acid molecules consumed per nm.sup.2 of silica surface, when stearic acid is reacted with the said silica in xylene for 2 hours at 120.degree. C., is at least 1.