| abstract |
Surface-modified, pyrogenically prepared silica is prepared by subjecting the pyrogenically prepared silica, which is in the form of aggregates of primary particles and possesses a BET surface area of 200 ± 25 m2/g, the aggregates having an average area of 7000 to 12 000 nm2, an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1050 nm, to surface- modification in a known way. It can be used for thickening liquid systems. |