Silica-based particulates
AssigneePPG Industries Ohio, Inc.
InventorsShantilal M. Mohnot, Harold E. Swift, James T. Dew
Life of this patent
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Abstract
A silica-based particulate material that may contain less than 5 wt. % of a multivalent cation and a method of preparing such a silica-based particulate material. The silica-based particulate material may be characterized as having a median particle size of at least 20 μm, a BET surface area of at least 90 m2/g, and a pH of at least 9.5; or as having a median particle size of up to 20 μm and a pH of at least 10. The silica-based particulate material may be used to make hydrophobic silica-based particulates, which may be characterized as having a pH of at least 10.5.
Claims71
A silica-based particulate material characterized as having:
- a median particle size of at least 20 μm;
- a BET surface area of at least 90 m2/g;
- and
- a pH of at least 9.5.
A hydrophilic silica-based particulate material comprising less than 5 wt. % of a multivalent cation, based on the oxide of said cation, characterized as having:
- a median particle size of up to 20 μm;
- and
- a pH of at least 10.
A hydrophobic silica-based particulate material characterized as having a pH of at least 10.5.
A method of forming a silica-based particulate material comprising the steps of:
- (a) providing a filter cake comprising silica;
- (b) applying water and shear to form a silica slurry;
- (c) adding an alkaline material to the cake before, during or after (b) to form an alkaline silica slurry;
- and
- (d) drying the silica slurry to form a silica-based particulate material characterized as having:
- a median particle size of at least 20 μm;
- a BET surface area of at least 90 m2/g;
- and
- a pH of at least 9.5.
A method of forming a silica-based particulate material comprising the steps of:
- (a) providing a filter cake comprising silica;
- (b) applying water and shear to form a silica slurry;
- (c) adding an alkaline material to the cake before, during or after (b) to form an alkaline silica slurry;
- and
- (d) drying the silica slurry to form a silica-based particulate material characterized as comprising less than 5 wt. % of a multivalent cation, based on the oxide of said cation, and having:
- a median particle size of up to 20 μm;
- and
- a pH of at least 10.5.
Dependencies are inferred from the claim text.