Abstract:
There is provided a tasteless denture cleaning composition comprising inter alia, a source of hypochlorite, a source of sulfite and precipitated silica gel.

Description:
FIELD OF THE INVENTION 
       [0001]    Tasteless denture cleansers 
       BACKGROUND OF THE INVENTION 
       [0002]    Denture cleanser products in tablet and powder form are well known in the art. The purpose of a denture cleanser is to remove stains, plaque, microbial contamination, etc. from the denture. A well known method is to place the denture in about 8 oz of warm water, add the tablet or powder, and allow the denture to soak until clean. The cleansing is achieved by release of oxygen from the cleanser formulation, usually by formation of hydrogen peroxide which then releases the oxygen. 
         [0003]    More effective cleansers have been formulated using hypochlorite either added as a powder directly to the formulation or by formation during the tablet or powder solubilization in the water during soaking. The preferred method of utilizing hypochlorite is to provide chloride in the presence of a pharmacologically acceptable source of an agent capable of oxidizing chloride ion to hypochlorite, preferably using potassium monopersulfate and sodium chloride. Upon addition to the water, hypochlorite is formed by a reaction between these compounds. While the hypochlorite provides improved cleansing, there is at least one drawback to using hypochlorite in that it imparts a typical “chlorine” odor to the solution, which many consumers find objectionable. 
         [0004]    An early patent in this field is U.S. Pat. No. 3,337,466. The use of sodium sulfite as a hypochlorite deodorizer is well known in the prior art. U.S. Pat. No. 4,295,985 discloses the use of sodium sulfite as a chlorine odor remover from skin and hair of bathers. U.S. Pat. Nos. 4,552,679 and 4,671,972 both disclose the use of sodium sulfite as a hypochlorite deodorizer in denture cleanser products, although the use of sulfites is not acceptable for use by consumers because “ The sulfur compounds replace the chlorine odor with their own sulfurous odor . . . .” Furthermore, this prior art requires the use of an encapsulated deodorizer in order to effectively reduce the hypochlorite odor. 
       SUMMARY OF THE INVENTION 
       [0005]    The improvement set forth by the present invention comprises the elimination of the sulfurous odor previously encountered when utilizing sodium sulfite as a hypochlorite deodorizer in denture cleansers, either with or without encapsulation, by the incorporation of precipitated silica gel into the composition 
     
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0006]    This invention deals with the deodorization of denture cleansers that utilize a hypochlorite generating agent when they are added to water. Specifically this invention utilizes a sulfite in combination with a precipitated silica gel as described in the US Pharmacopoeia XXII to both deodorize the hypochlorite odor, and prevent the sulfurous odor previously described in the prior art. As used herein the term odor includes the term taste. 
         [0007]    As used in the specification and claims, the term “hypochlorite generating agent” means any compound which upon contact with water generates or releases hypochlorite ion directly or by the interaction of two or more compounds. Illustrative, non-limiting examples of the hypochlorite generating agent of this invention are heterocyclic N-chloroimides such as a chloroisocyanurate, e.g., sodium dichloroisocyanurate, potassium dichloroisocyanurate, or trichlorocyanuric acid; complex salts of two or more compounds, e.g., [(mono-trichloro)-tetra(monopotassiumdichloro)]penta-isocyanurate; other N-chloroimides, e.g., sodium-p-toluene-sulfonochloramide, N,N-dichloro-p-toluenesulfonamide, sodium benzene-sulfonchloramide, N,N-dichlorobenzene-sulfonamide, N-chlorosuccinate. Still other compounds which liberate hypochlorite/chlorine on contact with water are N-chloro malonimide, N-chloro phthalinide and N-chloro naphthalimide; the hydantoins such as 1,3-dichloro-5,5-dimethyl hydrantoin; N-monochloro-C,C-dimethylhycrantoin; methylene-bis-(N-chloro-C,C-dimethylhydantoin); 1,3-dichloro-5-ethylhydantoin and 1,3-dichloro-5,5-diisoethylhydantoin; dry solid inorganic compound such as lithium hypochlorite, calcium hypochlorite; mixtures of salts, such as sodium persulfate and sodium chloride; sodium perborate and chlorinated 5-triazine triones. 
         [0008]    The sulfite cation may be an alkali metal cation, suitably sodium or potassium and the source of sulfite may be selected from the group consisting of sulfites, bisulfites, metabisulfites, and hydrosulfites 
         [0009]    The amounts of sulfite and precipitated silica gel in the dry composition (by weight of the entire composition) range between from about 0.05% to 5%, preferably from about 0.1% to 0.5%, for each of these components 
         [0010]    It will be recognized that the immediate invention is not limited by the following examples, and that additional formulation ingredients known in the art, for example flavors, and colorants, can be incorporated or substituted for ingredients in the examples. The suitable formulations of the present invention are set forth below 
       EXAMPLE 1 
       [0011]      
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 % by Weight 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Potassium Monopersulfate Anhydrous 
                 30.00 
               
               
                   
                 Sodium Perborate, Monohydrate 
                 10.00 
               
               
                   
                 Sodium Tripolyphosphate 
                 20.00 
               
               
                   
                 Sodium Sesquicarbonate 
                 28.80 
               
               
                   
                 Tetra Sodium EDTA 
                 0.50 
               
               
                   
                 Sodium Lauryl Sulfate 
                 0.50 
               
               
                   
                 Sodium Metasilicate, Anhydrous 
                 5.00 
               
               
                   
                 Sodium Chloride 
                 5.00 
               
               
                   
                 Precipitated Silica Gel 
                 0.10 
               
               
                   
                 Sodium Sulfite 
                 0.10 
               
               
                   
                   
                 100.00 
               
               
                   
                   
               
             
          
         
       
     
       EXAMPLE 2 
       [0012]      
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 % by Weight 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Potassium Monopersulfate Anhydrous 
                 25.00 
               
               
                   
                 Sodium Perborate, Monohydrate 
                 15.00 
               
               
                   
                 Sodium Tripolyphosphate 
                 20.00 
               
               
                   
                 Sodium Sesquicarbonate 
                 33.00 
               
               
                   
                 Tetra Sodium EDTA 
                 0.50 
               
               
                   
                 Sodium Lauryl Sulfate 
                 0.50 
               
               
                   
                 Sodium Chloride 
                 5.00 
               
               
                   
                 Precipitated Silica Gel 
                 0.50 
               
               
                   
                 Sodium Sulfite 
                 0.50 
               
               
                   
                   
                 100.00 
               
               
                   
                   
               
             
          
         
       
     
       EXAMPLE 3   
       [0013]    Taste Test 
         [0014]    A panel of 5 subjects were asked to smell the solution formed by adding 2.5 grams of the formulation in Example 2 to 200 ml of warm water. None of the 5 subjects smelled any chlorine, hypochlorite, or sulfurous odor. The same 5 subjects were asked to smell a similar solution as Example 2, but without the precipitated silica gel. None of the 5 subjects smelled any chlorine or hypochlorite odor, but 4 of the 5 reported a slight sulfurous odor. 
       EXAMPLE 4 
       [0015]      
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredient 
                 % by Weight 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Potassium Monopersulfate Anhydrous 
                 30.000 
               
               
                   
                 Sodium Perborate, Monohydrate 
                 10.000 
               
               
                   
                 Sodium Tripolyphosphate 
                 20.000 
               
               
                   
                 Sodium Sesquicarbonate 
                 29.995 
               
               
                   
                 Tetra Sodium EDTA 
                 0.500 
               
               
                   
                 Sodium Lauryl Sulfate 
                 0.500 
               
               
                   
                 Sodium Metasilicate, Anhydrous 
                 2.500 
               
               
                   
                 FD&amp;C Blue #1 
                 0.005 
               
               
                   
                 Peppermint Flavor 
                 0.250 
               
               
                   
                 Sodium Chloride 
                 5.000 
               
               
                   
                 Precipitaed Silica Gel 
                 1.000 
               
               
                   
                 Sodium Sulfite 
                 0.250 
               
               
                   
                   
                 100.000 
               
               
                   
                   
               
             
          
         
       
     
         [0016]    In the above examples, the product is intended to be dispensed as a free flowing powder. Tablets can be prepared from any of the examples by the addition of 0.2% magnesium stearate and removing 0.2% of sodium sesquicarbonate.