Patent ID: 8883129

Claim:
A method for making an enhanced efficacy antiperspirant active, said method comprising the steps of: (a) providing an aqueous solution of aluminum hydroxyhalide salt having a Band III polymer concentration of at least 20% based on a total polymer concentration of all Band I polymers, Band II polymers, Band III polymers, and Band IV polymers present in the aqueous solution, the aqueous solution having an aluminum to halide molar ratio greater than 1.5:1 and a total aluminum salt concentration of at least 10%; (b) adding to the aqueous solution of step (a) an aqueous solution of a monomeric aluminum salt to form a mixture, the aqueous solution of monomeric aluminum salt having an aluminum to anion molar ratio of from about 0.1:1 to about 1:1; and (c) drying the mixture to form a product as a powder with an average particle size of from about 0.1 microns to about 75 microns, the product having an aluminum to anion ratio of about 1.1:1 to about 1.8:1, a polymer size distribution including at least 20% Band III polymers, and a level of monomeric aluminum of from about 2% to about 20% based on the total weight of aluminum in the product, such that a contact time between the formation of the mixture in step (b) and the drying of the mixture in step (c) is from about 1 second to about 5 minutes; wherein the monomeric aluminum salt is aluminum chloride.