High fluoride compatibility dentifrice abrasives and compositions
AssigneeJ. M. Huber Corporation
InventorSatish K. Wason
Life of this patent
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Abstract
Novel precipitated silicon dioxide abrasive compositions which can be incorporated into therapeutic toothpaste compositions containing both soluble fluoride salts and soluble phosphate salts are disclosed. The abrasive comprise low structure precipitated silicon dioxides which have been reacted with about 10 to 300 parts per million alkaline earth metal ion, particularly calcium. Reaction with the alkaline earth metal ion minimizes abrasive interaction with the fluoride ion source in therapeutic toothpaste. Also provided are methods for preparation of the novel silicon dioxide abrasives and resulting toothpaste formulations containing such abrasives.
Claims8
A toothpaste composition, comprising:
- A. from about 6% to 35% by weight of a precipitated silica abrasive material which is a precipitated amorphous silicon dioxide prepared from fresh water alkali silicate by acidulation, which has been intimately reacted with a solution of a salt of an alkaline earth metal so as to have present about 10-300 parts per million of alkaline earth metal ions in said amorphous silicon dioxide, said amorphous silicon dioxide exhibiting a Radio-active Dentin Abrasion value of at least 40, an average particle size of from about 5 to 15 microns in diameter, a pack density of about 0.24 to 0.55 grams per milliliter, an oil absorption of about 70-95 ccs/100 grams, a BET surface area of about 100-250 m.sup.2 /g, and a percent loss on ignition of about 4-6%;
- B. from about 0.01% to 3.0% by weight of a water-soluble, fluorine containing material which yields fluoride ions in aqueous solution;
- C. from about 3% to 55% by weight of a humectant;
- D. from about 0.2% to 2.0% by weight of a binding agent;
- and
- E. from about 15% to 80% by weight of water;
- said composition providing a pH of from about 4 to 8 when slurried with water in a 3:1 water/composition weight ratio.
Dependencies are inferred from the claim text.