Aluminum-zirconium antiperspirant salts made with zirconium salts having low Zr:Cl ratio
US6663854B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Jun 25, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G25/006
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Disclosed are enhanced efficacy aluminum-zirconium chlorohydrate antiperspirant salts having a metal (Al+Zr) to chloride ratio of about 0.9 to about 1.2, preferably about 0.9 to about 1.1, most preferably about 0.9 to about 1.0. To achieve the highest possible antiperspirant efficacy, these salts are made with or include a zirconium hydroxychloride of the formula Zr(OH)4−bClb wherein b is about 2.8 to about 4.0, preferably about 3.2 to about 4.0, so that the Zr:Cl ratio in said zirconium hydroxychloride is about 0.36 to about 0.25, preferably about 0.31 to about 0.25. The present invention also embraces methods of making such antiperspirant salts and aqueous solutions of such antiperspirant salts. The present invention further embraces topical compositions comprising a dermatologically acceptable carrier and a perspiration reducing effective amount of an aluminum-zirconium antiperspirant salt as described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.