Method of coloring keratin-containing fibres using diazonium salts
US7192453B2 · kind B2 · utility
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1References
7Claims
0Family size
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Key dates
| Filing date | Oct 8, 2002 |
| Grant date | Mar 20, 2007 |
| Priority date | — |
| Expiry date | Nov 13, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The present invention relates to a method of coloring keratin-containing fibres, especially human hair, in which method a compound of formula (I), wherein R is hydroxy or NHR1, R1 being hydrogen or C1–C4alkyl, and B is an aromatic or heterocyclic ring, is diazotised, and the resulting diazonium salt is applied at a pH of from 2 to 5 to the material being colored and then, by means of increasing the pH to from 7 to 12, is fixed on the material in the form of an oligomeric or polymeric colorant
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.