Hair coloring compositions for use in oxidative hair dyeing

A system for dyeing hair wherein at least one primary intermediate is reacted with at least one coupler in the presence of an oxidizing agent to produce an oxidative hair dye, wherein the at least one coupler comprises a compound of the formula (1):

• wherein R is a moiety selected from formulae (2), (3) or (4):
• wherein R1, R2, R3, R4 and R5 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an amino group, a C1-C4 alkyl or haloalkyl group, a C1-C4 alkoxy or haloalkoxy group, and a nitrile group,
• and the at least one primary intermediate comprises a compound of the formula (5):
• wherein R6 and R7 are the same or different and are selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, a C2 to C4 hydroxyalkyl group, a benzyl group or a phenyl group, and R8 is selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, or a C2 to C4 hydroxyalkyl group, or the physiologically tolerated, water-soluble salts thereof.

A hair dyeing product composition for dyeing hair comprising, in a suitable carrier or vehicle, a dyeing effective amount of:

• (a) at least one primary intermediate,
• (b) at least one coupler;
• and
• (c) at least one oxidizing agent;
• wherein the at least one coupler comprises a coupler of formula (1):
• wherein R is a moiety selected from formulae (2), (3) or (4):
• wherein R1, R2, R3, R4 and R5 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an amino group, a C1-C4 alkyl or haloalkyl group, a C1-C4 alkoxy or haloalkoxy group, and a nitrile group, and the at least one primary intermediate is a compound of the formula (5):
• wherein R6 and R7 are the same or different and are selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, a C2 to C4 hydroxyalkyl group, a benzyl group or a phenyl group, and R8 is selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, or a C2 to C4 hydroxyalkyl group, or the physiologically tolerated, water-soluble salts thereof.

A hair dye composition comprising, in a suitable carrier or vehicle, an effective hair dyeing amount of:

• (a) at least one coupler of formula (1):
• wherein R is a moiety selected from formulae (2), (3) or (4):
• wherein R1, R2, R3, R4 and R5 are each independently selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an amino group, a C1-C4 alkyl or haloalkyl group, a C1-C4 alkoxy or haloalkoxy group, and a nitrile group, and
• (b) at least one primary intermediate of the formula (5):
• wherein R6 and R7 are the same or different and are selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, a C2 to C4 hydroxyalkyl group, a benzyl group or a phenyl group, and R8 is selected from the group consisting of a hydrogen atom, a C1 to C4 alkyl group, or a C2 to C4 hydroxyalkyl group, or the physiologically tolerated, water-soluble salts thereof.