Granted Patent B2

US 7,074,394 · App. 10/625,038 · Granted Jul 11, 2006

Abstract

Claims (22)

1. A stable and highly efficacious aqueous antiperspirant solution free of amino acid and polyhydric alcohol and consisting essentially of from about 15 to about 40 percent anhydrous solid of a salt selected from aluminum/zirconium tetrachlorohydrate, aluminum/zirconium pentachlorohydrate, and aluminum/zirconium octachlorohydrate in which the aluminum to zirconium (Al/Zr) atomic ratio of said salt falls within the limits of the shaded areas A, B, and C, of the drawing graph and wherein, respectively, the aluminum/zirconium tetrachlorohydrate has an Al/Zr atomic ratio from about 2 to about 6 and metal/chloride atomic ratio about 0.9 to about 1.25; aluminum/zirconium pentachlorohydrate having Al/Zr atomic ratio from about 6 to about 10 and metal/chloride atomic ratio from about 1.5 to about 1.65; and aluminum/zirconium octachlorohydrate having Al/Zr atomic ratio from about 6 to about 10 and metal/chloride atomic ratio from about 0.9 to about 1.5.

2. The antiperspirant solution of claim 1 wherein the salt is the aluminum/zirconium octachlorohydrate.

3. The antiperspirant salt of claim 1 wherein the salt is the aluminum/zirconium tetrachlorohydrate.

4. The antiperspirant salt of claim 1 wherein the salt is the aluminum/zirconium pentachlorohydrate.

5. The antiperspirant salt of claim 2 wherein the percent of the anhydrous salt is from about 20 to about 40.

6. The antiperspirant salt of claim 3 wherein the percent of the anhydrous salt is from about 20 to about 40.

7. The antiperspirant salt of claim 4 wherein the percent of the anhydrous salt is from about 20 to about 40.

8. The antiperspirant solution according to claim 1 which is dried to a powder.

9. A method of making stable aluminum-zirconium salt solution free of amino acid and polyhydric alcohol which comprises mixing and reacting basic aluminum halides and nitrates of the formula:

Al 2 (OH) 6-a X a

wherein X is Cl, Br and/or NO 3 , wherein a is from about 1 to 2 with a zirconium compound of the formula:

ZrO(OH) b X 2-b .

wherein b is a numerical number from 0 to 1.3 and X is Cl, Br and/or NO 3 at temperature not in excess of about 80° C.

10. The method of claim 9 wherein the reaction is at room temperature.

11. The method of claim 9 wherein the basic aluminum halides and nitrate employed in the reaction is made by reacting (a) aluminum powder, (b) an aluminum halide or nitrate solution and (c) water at a temperature greater than about 85° C.

12. The method of claim 9 wherein the basic aluminum halides and nitrate is made by mixing about 50% aluminum chlorohydrate with AlCl 3 or HCl from about room temperature to about reflux for a period of about 0.5 hr. to 2 days.

13. The method of claim 9 ; wherein the zirconium halide complex is made by mixing basic zirconium carbonate with HCl or zirconium oxychloride at a temperature of about 50–70° C. until the solution is clear.

14. The method of claim 13 wherein the zirconium halide complex is heated at about 80–100° C. for 0.5 to 4 hrs.

15. The method of claim 9 wherein the aluminum-zirconium solution is dried to a powder.

16. A roll on formulation in which the solution of claim 1 is the active ingredient.

17. A clear gel formulation in which the solution of claim 1 is the active ingredient.

18. An antiperspirant stick formulation in which the powder of claim 8 is the active ingredient.

Assignments (20)