Highly dispersible fine hydrophobic silica powder and...

Details Highly dispersible fine hydrophobic silica powder and... Highly dispersible fine hydrophobic silica powder and...

2003-12-25

2009-02-24

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

C423S337000

Reexamination Certificate

active

07494636

ABSTRACT:
A high dispersible hydrophobic fine silica powder can be made, wherein the silica powder has hydrophobicity of more than 50%, triboelectrostatic charge of more than −500 μC/g, decomposition rate of an organic group on the powder surface of less than 15%, transmittance of a 5% alcoholic dispersion liquid of more than 40% preferably, and a specific surface area of more than 200 m2/g. This high dispersible hydrophobic fine silica powder can be made by mixing a hydrophobic agent comprising a volatile organic silicon compound in the gas state with a fine silica powder in a fluidized bed type reaction vessel at the time of a hydrophobic treatment, and controlling a gas flow rate to more than 5.0 cm/sec at the time of this mixing.

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U.S. Appl. No. 10/540,002, filed Jun. 21, 2005, Ishibashi, et al.
U.S. Appl. No. 10/880,601, filed Jul. 1, 2004, Amano, et al.

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