Process for treating keratin fibers using a halochromic triarylmethane direct dye, an alkaline revealer and then an acidic eraser
US11273112B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2018 |
| Grant date | Mar 15, 2022 |
| Priority date | — |
| Expiry date | Dec 18, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/45
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention relates to a process for treating keratin fibers, especially human keratin fibers such as the hair, using i) at least one triarylmethane or sulfonophthalein direct dye of formula (I) or (I′) as defined below, ii) an alkaline revealer, iii) an eraser at acidic pH. A subject of the invention is also a composition comprising at least one triarylmethane direct dye of formula (I) or (I′) as defined below and at least one thickener and/or at least one hydrotropic solvent, and a multi-compartment kit comprising i), ii) and iii) in three separate compartments. The present invention makes it possible in particular to obtain keratin fiber coloring with intense and persistent tints which can be modified, erased and reformed several times without any loss of color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.