Patent ID: 7780937

Claim:
Granules based on pyrogenically prepared silicon dioxide and having the following physicochemical properties: Average grain size: 10 to 120 μm BET surface area: 40 to 400 m 2 /g Pore volume: 0.5 to 2.5 ml/g Pore size distributions: less than 5% of the total pore volume exists of pores with a diameter < 5 nm, rest meso- and macropores pH value: 3.6 to 8.5 Tapped density: 220 to 700 g/l, obtained by a process in which pyrogenically prepared silicon dioxide is dispersed in water and spray dried, the granules obtained are optionally heated at a temperature of from 150 to 1,100° C. for a period of 1 to 8 h and/or silanised, wherein the pyrogenically prepared silicon dioxide is prepared from silicon tetrachloride by means of flame hydrolysis and is a high-purity pyrogenic silicon dioxide powder having a metal content of less than 9 ppm with a BET surface area of 30 to 90 m 2 /g, a DBP index of 80 or less a mean aggregate area of less than 25000 nm 2 , a mean aggregate circumference of less than 1000 nm, wherein at least 70% of the aggregates have a circumference of less than 1300 nm.