Patent ID: 7578855
Filing Date: 2009-08-25
Classification: A61K,A61Q

Abstract:
1. A composition for dyeing keratin fibers comprising, in a suitable dyeing medium, at least one oxidation dyeing base chosen from 3-amino pyrazolo-[1,5-a]-pyridine derivatives of formula (I) as well as its salts and solvates: in which Z with the proviso that at least one of Z 1 and Z 2 is not a single covalent bond; R when Z 1 or Z 2 is a covalent bond, R 1 or R 2 respectively may also be a radical chosen from: optionally substituted C —O—CO—R, —CO—O—R, NR—CO—R′ or —CO—NRR′ in which R and R′ may be the same or different, and are independently chosen from a hydrogen atom and optionally substituted C R X is chosen from at least one anion that can ensure the electronegativity of the derivative of formula (I), with the proviso that at least one of the groups Z 1 , R 1 , Z 2 , R 2 is a cationic radical.