Basic aluminum and aluminum/zirconium antiperspirants and method of making the same
AssigneeReheis, Inc.
InventorsJawahar C. Parekh, Andrew M. Rubino
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Abstract
Basic aluminum halides and nitrates having enhanced antiperspirant efficacy are produced by reacting (a) aluminum powder, (b) an aluminum halide or nitrate solution and (c) water at a temperature greater than about 85.degree. C. This reaction is maintained until reaction products having an Al:anion ratio of about 1.2 to 1.8 and a solution solids concentration of about 30-40 wt. % on an anhydrous basis are obtained. The products are characterized as having a Size Exclusion Chromatography Test Band having a relative retention time corresponding to Band II of a Standard Basic Aluminum Chloride Size Exclusion Chromatogram and a Band II percent aluminum value of at least about 50% and a Band III percent aluminum value of less than 20%.
Claims10
A method of preparing basic aluminum halides and nitrates comprising:
- reacting (a) aluminum powder, (b) an aluminum halide or nitrate solution and (c) water, at a temperature greater than about 85.degree. C., and maintaining this reaction until reaction products having an Al:anion ratio of 1.2 to 1.8 and a solution solids concentration of about 28 to about 42 wt. % on an anhydrous basis are obtained, said reaction products being characterized as having a Size Exclusion Chromatography Test Band having a relative retention time corresponding to Band II of a Standard Basic Aluminum Chloride Size Exclusion Chromatogram;
- and having a Band I percent aluminum value of less than 1%, a Band II percent aluminum value of greater than 50% and a Band III percent aluminum value of less than 20%.
A method of preparing basic aluminum halide and nitrate/zirconium complexes comprising:
- reacting, at room temperature,
- (1) a basic aluminum halide or nitrate solution prepared by the method comprising reacting (a) aluminum powder, (b) an aluminum halide or nitrate solution and (c) water, at a temperature greater than 85.degree. C. and maintaining this reaction until reaction products having an Al:anion ratio of 1.2 to 1.8 and a solution solids concentration of about 28 to about 42 wt. % on an anhydrous basis are obtained, said reaction products being characterized as having a Size Exclusion Chromatography Test Band having a relative retention time corresponding to Band II of a Standard Basic Aluminum Chloride Size Exclusion Chromatogram;
- and having a Band I percent aluminum value of less than 1%, a Band II percent aluminum value of greater than 50% and a Band III percent aluminum value of less than 20%;
- and
- (2) a zirconium compound.
Dependencies are inferred from the claim text.