Patent ID: 7311736
Filing Date: 2007-12-25
Classification: C07D,C09B

Abstract:
1. A composition for dyeing keratin fibers comprising, in a medium that is suitable for dyeing, at least one compound of formula (I) wherein W W wherein: Z Z Z Z Z Z Z Z Z Z Z Z Z Z wherein each of the rings of formulae (II), (III), (IV) and (V) comprise not more than three nitrogen atoms and that two of the three nitrogen atoms may be contiguous, the bond a of the 5-membered cationic heteroaromatic radical of formula (II) being linked to the nitrogen atom N the bond b of the 6-membered cationic heteroaromatic radical of formula (III) being linked to the nitrogen atom N the double bond a′ of the 5-membered heteroaromatic radical of formula (IV) being linked to the nitrogen atom N the double bond b′ of the 6-membered heteroaromatic radical of formula (V) being linked to the nitrogen atom N the bond b, linking the cationic heteroaromatic radical of formula (III) to the nitrogen atom N the bond b′, linking the heteroaromatic radical of formula (V) to the nitrogen atom N R R R wherein R R X is an organic or mineral anion, as a direct dye.