Gradual permanent coloring of hair using dye intermediates in alkaline water which contains quaternary ammonium compounds
US6709468B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Mar 7, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method for permanently dyeing hair which comprises subjecting said hair to a number of treatments, having a set time interval between each two consecutive such treatments, wherein each treatment comprises steps a.) and b.) below:a.) contacting said hair, for a period of about 5 seconds to about 5 minutes with a recently made mixture of:i) part ai dye intermediates in water at alkaline pH with quaternary ammonium compounds;ii) part aii an oxidizing compound such as hydrogen peroxide in water at acidic pH;b.) rinsing said mixture from said hair with water;and wherein said number of treatments is between about 2 to about 30; and wherein said set time interval between each two consecutive treatments is between about 8 hours and 30 days.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.