Amino acid free stable aluminum / zirconium
AssigneeReheis, Inc.
InventorsZijun Li, Jawahar Chunilal Parekh
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Abstract
An amino acid free stable aluminum zirconium polyhydric alcohol aqueous solution having a high anhydrous antiperspirant solid concentration and a high percentage of low molecular weight aluminum species, i.e., containing 60% or more of band IV peak area based on high pressure liquid chromatography, is prepared by adding a zirconium salt to an aqueous polyhydric alcohol solution of a basic aluminum chloride.
Claims21
An amino acid free stable aluminum-zirconium aqueous solution comprising, in percent by anhydrous solid, about 20 to 55% antiperspirant active, about 20 to 75% by weight water and about 1 to 20% by weight polyhydric alcohol having at least 2 carbon atoms and at least two hydroxyl groups and having an aluminum to zirconium atomic ratio of about 0.8 to 10 and a metals to chloride atomic ratio of about 0.8 to 2.1.
A method for preparing a stable aqueous solution of an aluminum zirconium antiperspirant composition having enhanced efficacy by having a high proportion of lower molecular weight aluminum species comprising mixing and reacting a basic aluminum salt polyhydric alcohol aqueous solution with a zirconium compound at a temperature of 105° C. or below until a clear solution is attained and filtering the solution.
Dependencies are inferred from the claim text.