Pyrogenically produced silica

Details Pyrogenically produced silica Pyrogenically produced silica

2003-12-16

2009-06-02

Smith, Jennifer A (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S337000, C162S181400, C162S181600, C516S081000

Reexamination Certificate

active

07541014

ABSTRACT:
Pyrogenically produced silica powder with a BET surface of 30 to 90 m2/g, a dibutyl phthalate number of at least 80 and a tamped density of no more than 110 g/l. It is produced in that at least one vaporous silicon compound, a gas containing free oxygen and a combustible gas are mixed together in a closed burner and then burnt in a flame in the flame tube of the burner, the solid obtained is separated from the gas mixture and optionally purified, wherein the oxygen content of the gas containing free oxygen is adjusted such that the lambda value is greater than or equal to 1, and the gamma value is between 1.2 and 1.8. It can be used in toner applications.

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