Back to results
US 5,342,597 AGranted
Process for uniformly moisturizing fumed silica
AssigneeCabot Corporation
InventorDonald E. Tunison, III
Life of this patent
Estimating the term…
Abstract
An improved process for uniformly distributing high levels of water in hydrophilic fumed silica by mixing with dry water.
Claims11
A process for treating fumed silica having a B.E.T. surface area between about 30 m.sup.2 /g to 450 m.sup.2 /g comprising:
- converting a first quantity of hydrophilic fumed silica to hydrophobic fumed silica by the addition of a treating agent,
- combining a quantity of said hydrophobic fumed silica with up to 95% by weight water and mechanically agitating said combination of said hydrophobic fumed silica and water to form dry water,
- calculating a quantity of said dry water necessary to achieve a desired moisture level in a second quantity of hydrophilic fumed silica,
- introducing said calculated quantity of said dry water to said second quantity of hydrophilic fumed silica to form a hydrophilic fumed silica product dispersion and agitating by mechanical means to effect uniform water distribution throughout said dispersion.
1 more element
A process for treating fumed silica having a B.E.T. surface area between about 50 m.sup.2 /g to 450 m.sup.2 /g comprising:
- combining a quantity of a hydrophobic fumed silica with up to 95% by weight water and agitating said combination of said hydrophobic fumed silica and water to form dry water;
- calculating a quantity of said dry water necessary to achieve a desired moisture level in a quantity of hydrophilic fumed silica;
- and
- introducing said calculated quantity of said dry water to said quantity of hydrophilic fumed silica to form a hydrophilic fumed silica dispersion and agitating to effect uniform water distribution throughout said dispersion.
1 more element
Dependencies are inferred from the claim text.