Patent · US Expired

Two-stage process for dyeing keratin fibres and composition for use therein

US4566875A · kind A · utility

36Cited by
1References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 5, 1979
Grant dateJan 28, 1986
Priority date—
Expiry dateApr 5, 1999

Classification

  • Technology area (CPC A)Human Necessities
  • CPC primaryA61K2800/884
  • WIPO fieldPharmaceuticals
  • WIPO sectorChemistry

Abstract

A two-stage process for dyeing keratin fibres, especially human hair, which comprises applying a first composition containing at least one mercaptan present in a concentration insufficient to causes degradation of the hair and subsequently without intermediate rinsing, applying an oxidising composition so as to develop the dyestuff, and optionally one or more couplers, which is applied to the fibres, the dyestuff being an oxidative dyestuff precursor of the para type, a diphenylamine, a polyhydroxybenzene, a polyhydroxynaphthalene, a polyaminobenzene, a polyaminophenol or a polyaminopolyhydroxybenzene is described and compositions for use therein.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.