Spherical silica particles and method of production
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United States of America Patent
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Apr 22, 2003
Grant Date -
Apr 11, 2002
app pub date -
Aug 15, 2001
filing date -
Aug 15, 2000
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Abstract
Spherical, non-crystalline silica particles made by burning a non-halogenated siloxane starting material are substantially halogen-free, and have a content of metallic impurities other than silicon of not more than 1 ppm, a particle size of 10 nm to 10 .mu.m and a specific surface area of 3-300 m.sup.2 /g. Production of the particles is carried out by oxidative combustion of the non-halogenated siloxane in a flame at a high adiabatic flame temperature to effect the formation of a large number of core particles and promote their coalescence and growth.
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