Hydrous silica gel containing dentifrice
AssigneeW. R. Grace & Co.
InventorsRobert B. DeWolf, II, Rimantas Glemza
Life of this patent
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Abstract
Dentifrice compositions containing a hydrous silica gel having a water content of from about 20 to about 60 weight percent are disclosed. The abrasiveness of the gel is increased by contacting the gel with an alkaline medium to provide a gel pH of about 6 to about 10 and/or preparing the gel by drying and grinding a silica hydrogel that has been washed with an aqueous acidic solution having a temperature of from about 80.degree. to about 100.degree. F.
Claims25
A dentifrice composition comprising from about 5 to about 75 weight percent of a humectant and from about 5 to about 50 weight percent of a hydrous silica gel having a water content from about 20 to about 60 weight percent, an average particle size of from about 1 to about 40 microns, and a pH of from about 6 to about 10.
Dependencies are inferred from the claim text.