| abstract |
PURPOSE: To obtain an oxidation dye composition useful for dyeing human keratinous fibers, particularly hair by including a para oxidation dye precursor, ortho oxidation dye precursor, and a heterocyclic coupler and its salt in a solvent suitable for dyeing of the fibers. n CONSTITUTION: This oxidation dye composition includes at least one of a para oxidation dye precursor and an ortho oxidation dye precursor, and a compound of the formula (R 1 and R 3 are each H or a 1-4C alkyl; R 2 is H, a 1-4C alkyl, carboxyl, etc.; R 4 is H, a 1-4C alkyl, etc.; NHR 4 group positions at 4-, 6- or 7-sites on the benzene nuclear) or a salt thereof in a solvent suitable for dyeing fibers. The para oxidation dye precursor is selected from p-phenylenediamine, p-aminophenol, etc., and the ortho oxidation dye precursor is selected from o-aminophenol, etc. n COPYRIGHT: (C)1991,JPO |