Pyrogenically produced silicon dioxide powder

Details Pyrogenically produced silicon dioxide powder Pyrogenically produced silicon dioxide powder

2008-04-01

2008-04-01

Langel, Wayne A. (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C106S287340, C423S335000, C502S240000

Reexamination Certificate

active

11085151

ABSTRACT:
Pyrogenically produced silicon dioxide powder in the form of aggregates of primary particles having a BET surface area of 300±25 m2/g, wherein the aggregates display an average surface area of 4800 to 6000 nm2, an average equivalent circle diameter (ECD) of 60 to 80 nm and an average circumference of 580 to 750 nm.It is produced by a pyrogenic process in which silicon tetrachloride and a maximum of up to 40 wt. % of a second silicon component comprising H3SiCl, H2SiCl2, HSiCl3, CH3SiCl3, (CH3)2SiCl2, (CH3)3SiCl and/or (n-C3H7)SiCl3are mixed with primary air and a combustion gas and burnt into a reaction chamber, secondary air also being introduced into the reaction chamber, and the feed materials being chosen such that an adiabatic flame temperature of 1390 to 1450° C. is obtained.It can be used as a filler.

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