Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2005-06-07
2005-06-07
Nguyen, Ngoc-Yen (Department: 1754)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C423S339000, C106S287340
Reexamination Certificate
active
06902715
ABSTRACT:
The present invention provides silica particles, which include the following physical properties: BET surface area: 100-700 m2/g; DBP absorption: 100-500 g/100 g; tamped density: 100-250 g/l; ALPINE sieve residue>63μ: <5%; and particle sizes (cumulative volume distribution): d95<40 μm; d50<20 μm; and d5<10 μm. The present invention also provides a process for producing silica having a narrow particle size distribution, which includes drying a silica suspension in a pulse combustion dryer to produce silica particles having the following particle size distribution (cumulative volume distribution): d5<10 μm; d50<20 μm; and d95<40 μm.
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Barthel Thomas
Klasen Claas-Jürgen
Maus Ralf
Degussa - AG
Nguyen Ngoc-Yen
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