Coupler for use in oxidative hair dyeing
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein X is selected from halogen and R5SO4; R, R1, R2 and R5 are each individually selected from C1 to C22 alkyl and C1 to C22 mono or dihydroxyalkyl and R3 and R4 are individually selected from C1 to C6 alkyl groups, C1 to C6 hydroxyalkyl, C1 to C6 alkoxy, C1 to C6 aminoalkyl or R3 and R4 together form a C1 to C5 alkylene group.
The Procter & Gamble Company
A A C C
A61Q A61K C07C C07C
inventional inventional inventional additional
Mu-Ill James S. Yuh-Guo
Lim Anderson Pan