| abstract |
The subject of the present invention is cationic diazo compounds of formula (I) Col1 - LK - Col2 In which, Col1 and Col2, different from each other, represent: Formulas in which: with: W1, W6: -NR1- , -O-; W'1, W'6: -NR'1R'2, -OR'3; W2, W5, W'2, W'5: group of the following formulas (a) to (c): W3 , W4: radical comprising a quaternary ammonium; LK: C1-C40 hydrocarbon chain, carrying at least one cationic charge, optionally substituted, optionally interrupted by at least one heteroatom or group comprising at least one. It further relates to dyeing compositions comprising said compounds as direct dye, as well as a process for dyeing keratin fibers using this composition and a device with several compartments. |