Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1997-09-03
1999-06-01
Cameron, Erma
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
427221, 4274432, 106490, B05D 310
Patent
active
059086602
ABSTRACT:
A method for the preparation of hydrophobic precipitated silicas which are useful, for example, as reinforcing fillers in rubber compositions. The method comprises two steps, where in the first step an aqueous suspension of precipitated silica is contacted with an organosilicon compound in the presence of a catalytic amount of an acid to effect hydrophobing of the precipitated silica. In the second step the aqueous suspension of the hydrophobic precipitated silica is contacted with a water-immiscible organic solvent at a solvent to silica weight ratio greater than 5:1 to effect separation of the hydrophobic precipitated silica from the aqueous phase.
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Griffith Phillip J.
Harkness Brian R.
Herron William
Taylor Rosemary M.
Wilson David J.
Boley William F.
Cameron Erma
Dow Corning Corporation
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