Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1999-01-13
2000-12-12
Lovering, Richard D.
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
106490, 423337, 428405, 516100, B01J 1300, B05D 700, C01B 33149
Patent
active
061595403
ABSTRACT:
The present invention provides a method of treating silica wherein silica is reacted with a di- or tri-functional organosilane in an aqueous acid medium to provide a crude organosilane-capped silica product containing organosilicon impurities. The organosilicon impurities are extracted from the crude product with an organic liquid to provide a purified product consisting essentially of organosilane-capped silica. The purified product is dried to provide a dry organosilane-capped silica. The aqueous acid medium can include a displacing reagent which displaces at least one reactive functional group of the di- or tri-functional organosilane. The present invention further provides-continuous methods of treating silica with di- and tri-functional organosilanes, wherein the organic liquid and/or the organosilicon impurities are recycled and reused.
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Koehlert Kenneth C.
Maskara Alok
Menon Vinayan C.
Smith Douglas M.
Wallace Stephen
Cabot Corporation
Lovering Richard D.
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