Patent ID: 6740128
Filing Date: 2004-05-25
Classification: A61K,A61Q

Abstract:
A preparation for dyeing fibers (A), especially human hair, which is prepared by mixing a component and (A1), which contains an enamine, and a component (A2), which contains a carbonyl compound a primary amine, wherein component (A1) has an acidic pH and contains at least one enamine of Formula (I) or its acid addition salt of Formula (1a) wherein R1 represents a single ring or multi-ring aromatic group, especially an unsubstituted 5-membered or 6-membered aryl group, an unsubstituted 5-membered or 6-membered heterocyclic group, a 5-membered or 6-membered aryl group, substituted with a C1 to C4 alkyl group, a C1 to C4 hydroxyalkyl group, a hydroxy group, a methoxy group, a dialkylamino group or a halogen group, or a 5-membered or 6-membered heterocyclic group, substituted with a C1 to C4 alkyl group, a C1 to C4 hydroxyalkyl group, a hydroxy group, a methoxy group, a dialkylamino group or a halogen group, R2 is a linear or branched C1 to C8 alkyl group, a linear or branched C1 to C8 hydroxyalkyl group or a C1 to C8 alkoxyalkyl group, wherein oxygen atoms may be located between the carbon atoms of the alkyl chain, R3 is a linear or branched C1 to C8 alkyl group, a C1 to C8 alkoxyalkyl group, a linear or branched C1 to C8 alkylene group, a C1 to C8 alkoxyalkylene group, an oxygen atom, a sulfur atom, an â€”NH group, or an â€”NR group, wherein R is an alkyl group, an alkoxyalkyl group, a hydroxyalkyl group or hydrogen, the R1 and R3 groups, together with the nitrogen atom and the carbon atom of the basic enamine structure being able to form a cyclic compound and R4 being hydrogen, a linear C1 to C4 alkyl group or a branched C1 to C4 alkyl group, Aâˆ’ being the anion of an organic or inorganic acid, and the component (A2) having an alkaline pH and containing at least one carbonyl compound and at least one primary amine.