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Enhanced efficacy basic aluminum halides/metal cation salt, antiperspirants actives and compositions containing such materials and methods for making
| Details |
Inventors: Parekh, Jawahar C.; Amin, Pradip;
Assignee: Reheis, Inc. (Berkeley Heights, NJ)
Primary Examiner: Dodson; Shelley A.
Assistant Examiner:
Attorney, Agent or Firm: Plantamura; Arthur J.
Disclosed are aqueous antiperspirant active compositions comprising an admixtures of basic aluminum halides and a metal cation salts which yield enhanced antiperspirant efficacy; and methods of making such antiperspirant compositions. The basic aluminum halides, optionally contain an amino acid or salts of amino acids, and/or antimicrobial agent and are combined with a metal cation antiperspirant (e.g., Ti salt or Hf salt or Sn salt or Zr salt) and optionally with a organic solvent having at least two carbon atoms and at least one hydroxy group and mixtures thereof and methods of making such mixtures. Basic aluminum halides having enhanced antiperspirant efficacy are produced by reacting (a) aluminum powder; (b) an aluminum halide; and (c) water at a temperature greater than about 85° C. This reaction is maintained until reaction products having an Al:halide ratio of about 1.2 to 1.5 and preferably 1.3 to 1.4:1; and a solution solids concentration of about 30-40 weight percent on an anhydrous basis are obtained. The basic aluminum halide of this invention are characterized as having a Size Exclusion Chromatography (HPLC) Test Band I of less than 5%, preferably less than 1%, Band II percent aluminum value of 20%-60% preferably about 35% to 55%, Band III percent aluminum value of 10% to 35% preferably 15%-30% and Band IV value of 15% to 50% preferably 25% to 35% and sum of peak 3 and 4 areas of at least 45% and no more than 70% and preferably 65%. |
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DETAILED DESCRIPTION OF THE INVENTION The term "enhanced efficacy antiperspirant active" is used interchangeably herein with the terms "activated antiperspirant active" or "improved efficacy antiperspirant" active.
The enhanced antiperspirant contemplated herein means any aluminum containing antiperspirant material whose polymeric form is measurably shifted to lower molecular weight polymers relative to the polymer distribution of a typical aluminum chlorohydroxide (5/6 basic aluminum chloride).
The measurable shift is determined by high-pressure liquid chromatography as described herein.
In the analyses each sample is dissolved in deionized water to form about 5 mg/ml aluminum solution and filtered through a 0.
45μ filter and chromatographed within 5 minutes using 10 microliter samples at a flow rate of 0.
7 ml/min at a pressure of 450-500 psig and 0.
01N HNO3 eluent.
Two chromatographic columns used in series are a Waters Porasil column 30 cm long with an ID of 3.
9 mm, a pore size of 125° A, particle size of 10μ and a Phenomenex Column 25 cm long with an ID of 4.
6 mm, a pore size of 60° A and particle size of 10μ.
A Waters 2414 Differential Refractometer was used to scan chromatograph.
Relative peak areas, and peak heights were calculated using Waters Millenium32 Chromatography Manager.
The peaks observed in the chromatogram are designated in order of appearance on the chromatograms as peaks 1-2, (appears as a single peak, Band I) and peak 3 (Band II), peak 4 (Band III) and peak 5 (Band IV).
(See FIG.
1) The area of the peaks correspond to the relative concentration of aluminum polymer species exiting the column during the specified time passed from the injected sample.
The term "metal/chloride ratio" is used interchangeably herein with metal/halide ratio or metal/anion ratio and metals refer to (Al+Zr) or (Al+Zr+Hf), etc.
the ratio always refers to atomic ratio.
The antiperspirant active compositions contemplated by the invention: (a) basic aluminum halides having the empirical formula Al2(OH)6-x1Yx1Rp (AA)q wherein Y is Cl, Br, or I and 1
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Weight Loss and Supplements 
