Hair dye composition
AssigneeKao Corporation
InventorKenichi Matsunaga
Life of this patent
Estimating the term…
Abstract
Provided is a hair dye composition containing a direct dye (1) or (2): 1 [wherein, R1, R2, R3, R4, R5 and R6 each represents a C1-6 alkyl group; R7 and R8 each represents a hydrogen atom, a hydroxy group, a C1-6 alkyl group, a C1-6 alkoxy group, an amino group or alkylamino group; R9 represents a hydrogen atom or a C1-6 alkyl group; and X− represents an anion]. This hair dye composition undergoes a small change in color tone even after storage because it contains the direct dye (1) or (2) which has high stability against any one of an alkali agent, oxidizing agent and reducing agent, and at the same time, has markedly high hair dyeing power and exhibits excellent light resistance, washing resistance, perspiration resistance, friction resistance and heat resistance.
Claims6
A hair dye composition comprising, as a direct dye, a compound represented by the following formula (1) or (2):
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- wherein, R1, R2, R3, R4, R5 and R6 each independently represents a C1-6 alkyl group which may have a substituent;
- R7 and R8 each independently represents a hydrogen atom, a hydroxy group, a C1-6 alkyl group which may be substituted by a hydroxy group, a C1-6 alkoxy group, an amino group which may be substituted with one or two C1-6 alkyl groups which may be substituted by a hydroxy group;
- R9 represents a hydrogen atom or a C1-6 alkyl group;
- and X− represents an anion.
A hair dyeing method, which comprises applying to the hair a hair dye composition comprising, as a direct dye, a compound represented by the following formula (1) or (2):
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- wherein, R1, R2, R3, R4, R5 and R6 each independently represents a C1-6 alkyl group which may have a substituent;
- R7 and R8 each independently represents a hydrogen atom, a hydroxy group, a C1-6 alkyl group which may be substituted by a hydroxy group, a C1-6 alkoxy group, an amino group which may be substituted with one or two C1-6 alkyl groups which may be substituted by a hydroxy group;
- R9 represents a hydrogen atom or a C1-6 alkyl group;
- and X− represents an anion.
Dependencies are inferred from the claim text.