US 5,202,115 A · Basic aluminum antiperspirant active material having enhanced activity, antiperspirant active composition containing such material, and methods for preparation of such material and composition

Abstract

Disclosed is a basic aluminum material having enhanced antiperspirant activity, the material having the empirical formula Al.sub.2 (OH).sub.6-a X.sub.a, where 0.5.ltoreq.a.ltoreq.5.0 and X is a univalent complex oxoanion of nitrogen, chlorine and other halogens, which forms salts with Al.sup.3+ in aqueous solution so that these salts are essentially completely dissociated, which is readily soluble in water with metallic ions in the solution, and which forms conjugate acids that are strong acids; and wherein the material is characterized by: (a) size exclusion high performance liquid chromatography peaks corresponding to peak 3 and peak 4 of size exclusion chromatograms formed by HPLC technique; (b) a peak 4 relative area of at least 25%, a peak 3 relative area of less than 60%, the sum of the relative peak 3 and peak 4 areas being at least 50%; and (c) less than 10% chromatographic peaks eluting at shorter retention times than peak 3, corresponding to peaks 1 and 2.

Claims25

Dependent claims

An antiperspirant active composition comprising:

(1) a basic aluminum material, with enhanced antiperspirant activity, having the empirical formula:
Al.sub.2 (OH).sub.6-a X.sub.a,
where 0.5.ltoreq.a.ltoreq.5.0 and X is an anion that is a univalent complex oxoanion of nitrogen or a halogen, which anion forms salts with Al.sup.3+ in aqueous solution so that these salts are substantially completely disocciated, which anion is readily soluble in water with metallic ions in the solutions, and which anion forms conjugate acids that are strong acids;
wherein said basic aluminum material is characterized by:
(a) size exclusion high performance liquid chromatography peaks corresponding to peak 3 and peak 4 of size exclusion chromatograms formed by HPLC technique;
(b) a peak 4 relative area of at least 25%, a peak 3 relative area of less than 60%, the sum of the relative peak 3 and peak 4 areas being at least 50%;
(c) less than 10% chromatographic peaks eluting at shorter retention times than peak 3, corresponding to peaks 1 and 2;
and
(2) an antiperspirant active material containing a metal cation selected from the group consisting of Zr, Hf, Ti and Sn.

6 more elements

A method of forming an antiperspirant active composition, comprising mixing (1) an antiperspirant active material containing a metal cation selected from the group consisting of Zr, Hf, Ti and Sn, with (2) a basic aluminum material, with enhanced antiperspirant activity having the empirical formula:

Al.sub.2 (OH).sub.6-a X.sub.a,
where 0.5.ltoreq.a.ltoreq.5.0;
and X is an anion that is a univalent complex oxoanion of nitrogen or a halogen, which anion forms salts with Al.sup.3+ in aqueous solution so that these salts are substantially completely dissociated, which anion is readily soluble in water with metallic ions in the solutions, and which anion forms conjugate acids that are strong acids;
wherein said basic aluminum material is characterized by:
(a) size exclusion high performance liquid chromatography peaks corresponding to peak 3 and peak 4 of size exclusion chromatograms formed by HPLC technique;
(b) a peak 4 relative area of at least 25%, a peak 3 relative area of less than 60%, and the sum of the relative peak 3 and peak 4 areas being at least 50%;
and
(c) less than 20% chromatographic peaks eluting at shorter retention times than peak 3, corresponding to peaks 1 and 2.

5 more elements

Dependencies are inferred from the claim text.

Basic aluminum antiperspirant active material having enhanced activity, antiperspirant active composition containing such material, and methods for preparation of such material and composition

Life of this patent

Basic aluminum antiperspirant active material having enhanced activity, antiperspirant active composition containing such material, and methods for preparation of such material and composition

Life of this patent

Abstract

Claims25