Patent ID: 6342210
Filing Date: 2002-01-29
Classification: A61K,A61Q

Abstract:
A method for forming micronized antiperspirant salts comprising aluminum or aluminum and zirconium, wherein the refractive index for the micronized antiperspirant salts is in the range of 1.42-1.49 for aluminum salts and 1.46-1.52 for Alâ€”Zr salts, and wherein the method comprises the steps of:(1) forming an aqueous salt solution of a parent salt and solvent wherein the parent salt is selected from the group consisting of aluminum salts and aluminum zirconium salts and the glycol content of the salt solution is less than 5 weight %; (2) pouring the salt solution onto a bounded flat surface; (3) evaporating the solvent from the salt solution so as to form a glass; (4) breaking up the glass using one or more steps to form particles having an average size in the range of 0.5-2.00 cm2; (5) mixing the particles from step (4) with a non-aqueous liquid vehicle in which the salt is not appreciably soluble and subjecting the mixture to a homogenizing process to form a suspension with particles having an average size of less than or equal to 200 microns; and (6) grinding the mixture from step (5) at a temperature in the range of 20-70 degrees C. without added water or external heating being required so that the particles in the suspension have an average particle size of less than or equal to 20 microns.