| abstract |
Oxidn. dye-based hair-dyeing compsns., as described in the parent patent, contain tetraaminopyrimidines (II) as developers. In this addn., the compsns. contain, as couplers for (II), resorcinol derivs. of formula (I) (where X is an aliphatic 1-4C gp. or -NR1R2 in which R1 and R2 are each H or an aliphatic 1-4C gp.) In combination with (II), (I) yield strong, fast, brown shades. The dyes penetrate through hair, are non-toxic and do not irritate the skin. In an example, an oak-brown shade was obtd. on using 2,4-dihydroxypropiophenone as (I) and 2,4,5,6-tetraaminopyrimidine as (II). |