Patent ID: 6221149
Filing Date: 2001-04-24
Classification: C01B,C01P,C08K,C09C

Abstract:
A precipitated silica having:a CTAB specific surface of between 100 and 240 m.sup.2 /g,a DOP oil uptake lower than 300 ml/100 g,pores, a pore volume and a pore distribution such that the pores, whose diameter is between 175 and 275 .ANG., represent a pore volume less than 50% of the pore volume of the pores of diameters which are smaller than or equal to 400 .ANG., andan aluminum content of at least 0.45% by weight,said silica being in the form of spherical beads with a mean size of at least 80 .mu.m, powder with a mean size of at least 15 .mu.m, or granules of at least 1 mm in size, wherein after disintegration of the silica form with ultrasound, the median diameter of said silica is smaller than 5 .mu.m.