Colorant and method for producing temporary hair colors
US6312478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1999 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Oct 26, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P5/138
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The method for temporarily coloring and later decolorizing hair includes applying a colorant to the hair, which contains a monomethine or polymethine dye of formula (Ia/Ib), or a salt thereof, EQU W=L-V'(Ia).revreaction.W'-L=V (Ib), PA1 wherein W=L-V' and W'=L-V are tautomers, W and V are each a substituted five-member or six-member heterocyclic ring, each of which is a substituted pyrazolone, substituted pyridone, substituted dioxothiazoline, substituted rhodanine, substituted dioxoimidazolidine or substituted barbituric acid; PA1 wherein L represents --[--CH.dbd.CH--].sub.m --CR.dbd.[.dbd.CH--CH.dbd.].sub.n.dbd. and R is hydrogen, a phenyl group, a halogen atom, a methyl group or a carboxamido group, and wherein m and n are each 0, 1 or 2, but n+m.ltoreq.2; then allowing the colorant to act for from 10 to 45 min at 20 to 50.degree. C.; subsequently rinsing with water and drying and at a later time, decolorizing the hair with a reducing agent or an oxidant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.