Patent ID: 6605125
Filing Date: 2003-08-12
Classification: A61K,A61Q

Abstract:
A method of dyeing hair, which comprises: applying a hair dye composition formulated as a two part composition, a first part containing a direct dye compound represented by the following formula (1), (2), (3) or (4): wherein, R1 and R1â€² each independently represents a C1-6 alkyl group which may have a substituent or an aryl group which may have a substituent, with the proviso that when the direct dye is a compound of formula (4), at least one of R1 and R1â€² must be an aryl group which may have a substituent; W and Wâ€² each independently represents a group â€”Aâ€”NR2R3 or a heterocyclic aromatic group which may have a substituent; A and Aâ€² each independently represents a divalent aryl group which may have a substituent; R2, R2â€² and R3 each independently represents a hydrogen atom, a C1-6 alkyl group which may have a substituent or an aryl group which may have a substituent; or R2, R2â€² or R3 may be bonded to A or Aâ€², thereby fanning a nitrogen-containing heterocycle, R2 and R3 are coupled to form a nitrogen-containing heterocycle, together with the adjacent nitrogen atom, or R2 and R2â€² are coupled to form a nitrogen-containing heterocycle together with the adjacent two nitrogen atoms and Q; R4, R5 and R6 each independently represents a hydrogen atom, a C1-6 alkyl group which may have a substituent or a C1-6 alkenyl group which may have a substituent; Q represents a divalent organic connecting group; X represents a modified carboxy group, an â€”SO2â€”T-group (in which, T represents a C1-4 alkyl group, C2-4 alkenyl group or an aryl group) or a heterocyclic group; Y represents a cyano group or a heterocyclic group; Z represents a cationic group, rings b, c, B, C, Bâ€² and Câ€² may each have a substituent other than that described directly in the formula, or when in the formula (1), R1 represents a C1-6 alkyl group and W represents a group â€”Aâ€”NR2R3 (except that R2 or R3 is bonded to A to form a nitrogen-containing group), any one of the rings b, c and A has at least one substituent; and Anâˆ’ represents an anion; and a second part comprising an oxidizing agent in admixture to the hair.