Dyeing composition comprising at least one pyrazolopyrimidine oxidation base and at least one 6-alkoxy-2,3-diaminopyrimidine coupler

摘要

A dye composition with a pH below 9 comprising a pyridinic coupler of specified formula and a pyrazolopyrimidine oxidation base of specified formula. A dye composition with a pH below 9 comprising a pyridinic coupler of specified formula and a pyrazolopyrimidine oxidation base of specified formula. The coupler is of formula (I). R1, R4 = H, 1-6C alkyl optionally substituted with one or more halogen or one or more hydroxy or amino or mono- or di- or trialkyl(1-4C)amino or aryl or 1-3C alkoxy or a heterocycle, 6-18C aryl optionally substituted with one or more amino or hydroxy or 1-3C alkoxy or 1-6C alkyl, 2-6C alkenyl, carboxyalkyl(1-6C), 1-6C alkylthio; R2 = 2-6C linear alkyl optionally substituted with one or more halogen or one or more hydroxy or amino or mono- or di- or trialkyl(1-4C)amino or aryl or 1-3C alkoxy or a heterocycle, 6-18C aryl optionally substituted with one or more amino or hydroxy or 1-3C alkoxy or 1-6C alkyl, 2-6C alkenyl, carboxyalkyl(1-6C), 1-6C alkylthio; R1 + R2 = optionally together with the nitrogen to which they are attached a 3-18 link heterocycle optionally additionally containing one or more O or N or S optionally substituted with one or more 1-6C alkyl or amino or 2-6C acylamino or 1-4C hydroxyalkyl and not containing a peroxide bond nor diazo nor nitroso radicals, simultaneously a linear 1-6C hydroxyalkyl radical; and R3 = 1-6C alkyl optionally substituted with one or more halogen or hydroxy or amino or 1-3C alkoxy or 6-18C aryl optionally substituted with one or more amino or hydroxy or 1-3C alkoxy or 1-6C alkyl, carboxyalkyl(1-6C), 1-6C alkylthio. The oxidation base is of formula (II). R5, R5', R6, R7 = H, 1-6C alkyl optionally substituted with one or more hydroxy or amino or 1-3C alkoxy or aryl, 6-18C aryl optionally substituted with one or more amino or hydroxy or 1-3C alkoxy or 1-6C alkyl or carboxyalkyl(1-6C) or 1-6C alkylthio; and R8 = H, 1-6C alkyl optionally substituted with one or more halogen, or hydroxy or amino or 1-3C alkoxy or aryl. Independent claims are also included for: (1) a method of oxidation dyeing of the hair by applying the composition in the presence of an oxidizing agent for sufficient time to develop the desired color; and (2) a device with several compartments or kit, in one of which is the dye composition and in the other of which is an oxidizing agent.