Gradual permanent coloring of hair using dye intermediates in a shampoo base
US6726729B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2001 |
| Grant date | Apr 27, 2004 |
| Priority date | — |
| Expiry date | Jun 13, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/88
- 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:part ai: oxidative dye intermediates in a shampoo base at alkaline pH and wherein part ai optionally has about 0.01 to about 5.0% of a conditioning agent;part aii: an oxidative compound in a shampoo base at acidic pH and wherein part ai optionally has about 0.01 to about 5.0% of a conditioning agent;with the proviso that at least one of part ai and part aii has about 0.01 to about 5.0% of a conditioning agent;b.) rinsing said mixture from said hair with water;and wherein said number of treatments is between about 2 to about 30; andwherein 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.