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US 12,215,034 B2Granted
Spherical stannous compatible silica particles for reduced RDA
AssigneeEvonik Operations GmbH
InventorsKarl W. Gallis, William J. Hagar, Terry W. Nassivera, Lawrence Edward Dolan, Sanjeev Midha, Eva Schneiderman
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Abstract
Silica particles having a d50 median particle size from 8 to 20 μm, a sphericity factor (S80) of at least 0.9, a BET surface area from 0.1 to 8 m2/g, a total mercury intrusion pore volume from 0.35 to 0.8 cc/g, and a loss on ignition from 3 to 7 wt. %, are disclosed, as well as methods for making these silica particles, and dentifrice compositions containing the silica particles.
Claims18
Silica particles, characterized by:
- (i) a d50 median particle size in a range of from 8 to 20 μm;
- (ii) a sphericity factor (S80) of greater than or equal to 0.9;
- (iii) a BET surface area in a range of from 0.1 to 8 m2/g;
- (iv) a total mercury intrusion pore volume in a range of from 0.35 to 0.7 cc/g;
- and
- (v) a loss on ignition (LOI) in a range from 3 to 7 wt. %,
- wherein the silica particles have a pack density in a range of from 61 to 68 lb/ft3, and
- wherein the silica particles have an Einlehner abrasion value in a range of from 11 to 17 mg lost/100,000 revolutions, and
- wherein the silica particles have a ratio of (d90−d10)/d50 in a range of from 1.1 to 2.2.
6 more elements
Dependencies are inferred from the claim text.