High efficacy, low irritation aluminum salts and related products

Abstract

A zirconium-free aluminum salt which: (a) has an aluminum to chloride molar ratio in the range of 0.5-2.5:1; (b) comprises a nitrogen containing buffering material in an amount such that the ratio of nitrogen containing material to aluminum is the range of 0.05-0.26:1, and which nitrogen containing material is selected from the group consisting of a nitrogen containing buffering material of formula where n is a number in the range of 1-20, and each of R 1 , R 2 , and R 3 is independently selected from the group consisting of hydrogen, methyl and ethyl; and (c) the salt has a pH in the range of 2-4 at a concentration of 15%; wherein the salt is free of any other halide scavenging material and has a value of at least 0.50 for the ratio calculated as: area of Peak 5/total area under Peak 2+Peak 3+Peak 4+Peak 5.

We claim:  
     
         1 . A zirconium-free aluminum salt which: 
 (a) has an aluminum to chloride molar ratio in the range of 0.5-2.5:1;    (b) comprises a nitrogen containing buffering material in an amount such that the ratio of nitrogen containing material to aluminum is the range of 0.05-0.26:1 and which nitrogen containing material is selected from the group consisting of a nitrogen containing buffering material of formula                          where n is a number in the range of 1-20, and each of R 1 , R 2 , and R 3  is independently selected from the group consisting of hydrogen, methyl and ethyl; and    (c) the salt has a pH in the range of 2-4 at a concentration of 15%; wherein the salt is free of any other halide scavenging material and has a value of at least 0.50 for the ratio calculated as:                area                 of                 Peak                 5         total                 area                 under                 Peak                 2     +     Peak                 3     +     Peak                 4     +     Peak                 5         .                     
     
     
         2 . A zirconium-free aluminum salt according to  claim 1  wherein the ratio of nitrogen containing material to aluminum is in the range of 0.05-0.16:1.  
     
     
         3 . A zirconium-free aluminum salt according to  claim 1  wherein each of R 1 , R 2 , and R 3  is methyl.  
     
     
         4 . A zirconium-free aluminum salt according to  claim 1  wherein the nitrogen containing material is selected from the group consisting of glycine, alanine, serine, glutamine, threonine, valine, leucine and betaine.  
     
     
         5 . An antiperspirant composition made with the composition of  claim 1 .  
     
     
         6 . An antiperspirant composition according to  claim 5  wherein the composition is a stick comprising a gelling agent which is stearyl alcohol or dibenzylidene sorbitol.  
     
     
         7 . An antiperspirant composition according to  claim 6  comprising: 
 40-55% cyclomethicone; 20-30% stearyl alcohol; 7-15% talc; 15-22% aluminum antiperspirant active added as a powder; optionally 1-3% fragrance.  
 
     
     
         8 . An antiperspirant composition according to  claim 5  wherein the composition is a roll-on comprising 45-65% cyclomethicone; 0.1-10% cyclomethicone/dimethicone copolyol; 10-25% in a solution form as 25-45% actives on an anhydrous basis in water; 5-30% water; and optionally 1-3% fragrance.  
     
     
         9 . An antiperspirant composition according to  claim 5  wherein the composition is a soft solid comprising 40-70% elastomer in cyclomethicone; 5-15% polyethylene; 10-20% C12-15 alkylbenzoate; 0.1-25% antiperspirant active added in powder form 1-15% dimethicone (100 centistokes); and optionally 1-3% fragrance.  
     
     
         10 . An antiperspirant composition according to  claim 5  wherein the composition is a gel comprising 5-50% cyclomethicone; 0.1-10% cyclomethicone/dimethicone copolyol; 0-10% hydrogenated polyisobutene 250; 0-10% C12-15 alkylbenzoate; 0-10% dimethicone (100 centistokes); 0.1-25% antiperspirant active added in powder form or 10-25% of antiperspirant active added as a solution of 25-45% actives on an anhydrous basis; 5-50% water; and optionally 1-3% fragrance.  
     
     
         11 . An antiperspirant composition according to any one of claims  5 - 10  wherein the glycol content is less than 1.0 weight %.