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Prevention of crystal formation in toothpaste
| Details |
Inventors: Winston, Anthony; Conley, Bruce; Nelson, Bruce J.; Mayer, Carl;
Assignee: Church & Dwight Co., Inc. (Princeton, NJ)
Primary Examiner: Krass; Frederick
Assistant Examiner:
Attorney, Agent or Firm: Frenkel & Associates
In dentifrices containing sodium bicarbonate and anionic species which can react with sodium and water to precipitate hydrated crystals, the ratio of water to humectants, abrasives, and/or thickeners is adjusted so that the dentifrice has a water activity of no greater than 0.60 so as to greatly reduce the salting out of the anionic species. |
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DETAILED DESCRIPTION OF THE INVENTION The dentifrices of the present invention include toothpastes, dental creams, or dental gels.
They comprise the several essential, as well as optional, components disclosed hereinafter.
A dentifrice is a substance or preparation used with a toothbrush to aid mechanical cleaning of the accessible surfaces of the teeth.
A typical formulation for a dentifrice (e.
g.
, toothpaste) contains varying amounts of humectants, organic thickeners and gums, inorganic thickeners, and flavors and sweeteners.
Most dentifrices contain one or more active components to reduce decay, reduce or remove tartar buildup, reduce sensitivity, or provide for remineralization, for example.
The most widely used active in dentifrices is a water-soluble fluoride ion source which is effective as an anti-caries agent.
Fluoride ion sources thus useful include inorganic fluoride salts, such as soluble alkali metal or alkaline earth metal salts, for example, sodium fluoride, potassium fluoride, sodium fluorosilicate, ammonium fluorosilicate, sodium fluorozirconate or sodium monofluorophosphate.
Alkali metal fluorides such as sodium fluoride, or sodium monofluorophosphate, and mixtures thereof, are particularly useful.
The amount of the soluble fluoride ion source in the dentifrice is dependent on the particular compounds used and the type of dentifrice, but it must be incorporated in an effective but nontoxic amount, generally up to about 5.
0% of the preparation.
Any suitable minimum amount of such compound may be used, but it is preferable to employ a sufficient quantity as to release about 25 up to a maximum of 5,000 ppm, preferably about 850 to 1500 ppm.
of fluoride ion.
Typically, in the case of sodium fluoride the fluoride ion source is present in an amount from 0.
05% to 0.
65% by weight, based on the weight of the dentifrice.
In the case of sodium monofluorophosphate the compound may be present in an amount of about 0.
2 2% by weight.
In the dentifrices of this invention, sodium bicarbonate is incorporated as both an anticalculus adjuvant and an abrasive
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