Primary intermediates for oxidative coloration of hair
AssigneeThe Procter & Gamble Company
InventorsMu-Ill Lim, Yuh-Guo Pan
Life of this patent
Estimating the term…
Abstract
Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein R1 and R2 are each independently selected from hydrogen atoms, a C1 to C5 alkyl or hydroxyalkyl group, or R1 and R2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R1 and R2 may be hydrogen.
Claims13
A hair dye product comprising a hair dyeing composition containing at least one primary intermediate and at least one coupler and a developer composition containing one or more oxidizing agents, the hair dyeing composition containing a primary intermediate comprising a compound of formula (1):
- wherein R1 is selected from the group consisting of a hydrogen atom and a C1 to C5 alkyl group, and R2 is a C1 to C5 alkyl group, or R1 and R2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2.
In a hair dyeing system 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, the improvement wherein the at least one primary intermediate comprises a compound of the formula (1):
- wherein R1 is selected from the group consisting of a hydrogen atom a C1 to C5 alkyl group, and R2 is a C1 to C5 alkyl group, or R1 and R2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2.
A hair dyeing composition comprising, in a suitable carrier or vehicle, an effective hair dyeing amount of:
- (a) at least one coupler, and
- (b) at least one primary intermediate comprising a compound of the formula (1):
- wherein R1 is selected from the group consisting of a hydrogen atom and a C1 to C5 alkyl group, and R2 is a C1 to C5 alkyl group, or R1 and R2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2.
Dependencies are inferred from the claim text.