BigPatents India

Pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles having a BET surface area of 200 ± 25 m2/g, wherein the aggregates display an average surface area of 7000 to 12000 nm2, an average equivalent circle diameter (ECD) of 80 to 100 mm and an average circumference of 650 to 1050 mm. It is produced by a pyrogenic process in which silicon tetrachloride and a second silicon component comprising H3SiCl, H2SiCl2, HsiCl3, CH3SiCl3, (CH3)2SiCl2, and/or (CH3)3SiCl and/or (n-C3H7) SiCl3 are mixed with primary air and a combustion gas and burnt into a reaction chamber, secondary air also being introduced into the reaction chanter, and the feed materials being chosen such that an adiabatic flame temperature of 1570 to 16300C is obtained. It can be used as a filler. (FIG.nil)