Summit Research Labs, Inc.

Somerville Technology Group, Inc.

Shailesh Mehta

Allan Rosenberg

Thomas L Harper

The present invention describes a method and compositions by which introducing POion at particular stage in the preparation of aluminum/zirconium solutions surprisingly results in significantly improved zirconium molecular weight stability.

Stabilized aqueous aluminum zirconium solutions

Disclosed is process of making stable antiperspirant active solutions, which process comprises the steps of: (A) preparing an aqueous solution comprising an aluminum-containing antiperspirant active, water, and an anhydrous solvent having a solubility parameter of from about 9 (cal/cm ) to about 15 (cal/cm ) ; (B) spray-drying the aqueous solution to form a solid powder comprising aluminum-containing antiperspirant active and the anhydrous solvent; and (C) dissolving the solid powder in a second anhydrous solvent at a temperature of not more than 85&deg; C., the second anhydrous solvent comprising a 1,2-diol solvent having at least 4 carbon atoms, to form a stable antiperspirant active solution comprising solubilized aluminum-containing antiperspirant active and the 1,2-diol solvent. The stable antiperspirant active solutions are especially useful as manufacturing intermediate materials that provide improved formulation flexibility when preparing antiperspirant consumer products, especially those products that are clear or translucent in appearance.

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Port Jervis, NY, United States of America

Shailesh Mehta