Pyrogenically prepared silicon dioxide with a low thickening...

Details Pyrogenically prepared silicon dioxide with a low thickening... Pyrogenically prepared silicon dioxide with a low thickening...

2011-01-18

2011-01-18

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S336000, C430S108700, C524S492000, C524S493000, C524S494000, C501S039000, C106S482000, C106S491000

Reexamination Certificate

active

07871589

ABSTRACT:
Provided is a pyrogenically prepared SiO2powder in the form of aggregated primary particles having a statistical thickness surface area (STSA) of 10-500 m2/g, a thickening action based on the STSA of 4-8 mPas·g/m2, and a micropore volume of 0.03-0.07 cm3/g, and a process for preparing the pyrogenic SiO2powder, which involves: introducing hydrolyzable silicon compounds, a primary gas comprising oxygen, and a primary combustion gas into a mixing chamber to produce a mixture; igniting the mixture in a burner to produce a flame, which is burned into a reaction chamber to produce the pyrogenic SiO2powder and gaseous substances; and separating the pyrogenic SiO2powder from the gaseous substances, wherein a ratio of the amount of primary combustion gas introduced to a stoichiometric amount of primary combustion gas required is referred to as gammaprimaryand has a value of less than 1, and wherein a ratio of the amount of primary gas comprising oxygen introduced to a stoichiometric amount of primary gas comprising oxygen required is referred to as lambdaprimaryand has a value of greater than 1.

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