Aqueous compositions for darkening keratinous materials
US4310329A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1981 |
| Grant date | Jan 12, 1982 |
| Priority date | — |
| Expiry date | Mar 2, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/58
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Aqueous composition for darkening keratinous material, particularly hair, comprise a mixture of a solution of a salt of thiosulphuric acid, preferably in an amount of 0.2-5.0% by weight as thiosulphate ion, preferably as the sodium thiosulphate or an amine such as triethanolamine thiosulphate; with a solution of a complex of bismuth with an amino-polyacetic acid such as nitrilotriacetic acid or ethylenediamine tetracetic acid, the bismuth preferably being present in an amount (measured as carbonate) of 0.1-5.0% by weight; in the presence of a water-soluble amine, preferably an a alkanolamine such as mono-, di- or triethanolamine in an amount to maintain the pH in the range 8 to 11; and of a di- or poly-hydroxy humectant, preferably glycerol or propylene glycol in an amount of 5-70% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.