| abstract |
Parent Patent disclosed oxidn. dye-based hair-dyeing compsns. contg. tetraaminopyrimidines, (II), as developers. In this addn., the compsns. contain, as coupler components, amino-pyridine derivs. of formula (I): (where R1 and/or R2 are H or 1-4C alkyl; X is H, 1-4C alkyl or -NR1R2; Y is H, 1-4C alkyl or OH, provided X and Y do not denote H and 1-4C alkyl simultaneously). The compsns. can be used as solns., emulsions, creams or gels, esp. at pH 8-10, 15-40 degrees C. (I) in combination with (II) yield intense, fast, stable non-toxic yellow, yellow-brown and red-brown shades which do not irritate the skin. In an example, hair dye compsn. contained 2,6-diamino-pyridine, 2-amino-3-hydroxy-pyridine or 2,6-N,N,N',N'-tetraethyl-diaminopyridine as (I) and 2,4,5,6-tetraaminopyridine as (II). |