Patent ID: 8147810
Filing Date: 2012-04-03
Classification: A61K,A61Q,C01F,C01G,C01P

Abstract:
1. A method of making an antiperspirant active composition comprising: I) heating an aqueous solution containing an aluminum salt having an aluminum to chloride molar ratio of about 0.3:1 to about 3:1, optionally with a buffer agent, at a temperature of about 50° C. to about 100° C. to reflux for a period of time of about 1 hour to about 6 hours to obtain an aluminum salt solution; II) adding an aqueous solution of sodium hydroxide to obtain an aluminum salt solution having an OH:Al molar ratio of about 2:1 to about 2.6:1 to obtain a pH adjusted aluminum salt solution having a pH of about 2 to about 5; III) providing a calcium ion to the solution; and IV) optionally adding an aqueous solution containing a zirconium compound to the pH adjusted aluminum salt solution to thereby obtain an aluminum-zirconium salt solution having a molar ratio of aluminum to zirconium of about 5:1 to about 10:1,