Hair coloring agent and hair dyeing method

Abstract

Disclosed is a two-agent type hair coloring agent prepared by mixing a first agent and a second agent, wherein the first agent contains a dye component containing a basic dye as a main component, and an alkaline agent, the second agent contains a hydrogen peroxide solution as a main component thereof, and at least one of the first agent and the second agent further contains metal nanoparticles.

Claims

1. A two-agent type hair coloring agent prepared by mixing a first agent and a second agent, wherein the first agent contains a dye component containing a basic dye as a main component, and an alkaline agent, the second agent contains a hydrogen peroxide solution as a main component thereof, and at least one of the first agent and the second agent further contains metal nanoparticles, wherein the metal nanoparticles are gold nanoparticles or platinum nanoparticles.

2. The hair coloring agent according to claim 1, wherein the hair coloring agent contains no oxidation dye.

3. The hair coloring agent according to claim 1, wherein the hair coloring agent contains the hydrogen peroxide solution at a concentration of 4.5 mass % in an amount corresponding to a proportion such that 30 to 70 mass % of the hydrogen peroxide solution is blended, relative to 100 mass % of the second agent.

4. The hair coloring agent according to claim 1, wherein the dye component further contains an HC dye.

5. A hair dyeing method comprising: a first step of applying a two-agent type hair coloring agent onto hair and leaving the hair for a predetermined time; a second step of rinsing the hair on which the hair coloring agent is applied; wherein the two-agent type hair coloring agent is prepared by mixing a first agent and a second agent, the first agent containing a dye component containing a basic dye as a main component, and an alkaline agent, and the second agent containing a hydrogen peroxide solution as a main component thereof, and at least one of the first agent and the second agent further contains metal nanoparticles wherein the metal nanoparticles are gold nanoparticles or platinum nanoparticles.

6. The hair dyeing method according to claim 5, wherein the hair coloring agent contain no oxidation dye.

7. The hair dyeing method according to claim 5, wherein the hair coloring agent contains the hydrogen peroxide solution at a concentration of 4.5 mass % in an amount corresponding to a proportion such that 30 to 70 mass % of the hydrogen peroxide solution is blended, relative to 100 mass % of the second agent.

8. The hair dyeing method according to claim 5, wherein the dye component further contains an HC dye.

9. The hair dyeing method according to claim 5, further comprising a third step of, after the second step, applying an aqueous solution of tea powder onto the hair and leaving the hair for a predetermined period of time.

Description

EXAMPLES

(1) Hereinafter, the present invention will be described in further detail by way of examples. It should be appreciated that the scope of the present invention is by no means limited by the examples.

Example 1

(2) A gold nanocolloid (manufactured by Johzen Co. Ltd.) was added dropwise to 50 g of a base color dye obtained by mixing a cream base composed mainly of cetanol with 5 mass % of a dye mixture obtained by mixing a basic dye and an HC dye serving as dye components at 9:1, and 50 g of alkaline agent containing ammonia water and ammonium hydrogencarbonate was further mixed therewith, to prepare a first agent. The gold nanocolloid was prepared such that 0.0005 mass % of the gold nanoparticles was contained in the first agent.

(3) Then, 30 g of a 4.5% hydrogen peroxide solution was mixed with 30 g of the first agent, to prepare a hair coloring agent.

(4) Next, the prepared hair coloring agent was applied onto the hair of a female subject who had black hair and almost no gray hair. Then, the hair on which the hair coloring agent had been applied was left for 10 minutes, and thereafter was irradiated with far-infrared radiation for about 15 minutes. At this time, the temperature of the hair was about 30° C.

(5) Then, the hair was washed with a commercially available shampoo. Then, the water on the hair was fully wiped off with a towel. In this way, the hair was subjected to cosmetic hair dyeing. At this time, it was confirmed that the hair was uniformly dyed in Level 8 brown color.

(6) Then, the dyed hair was shampooed once a day, and the change in the color of the hair was observed. As a result, the hair was still uniformly dyed in Level 8 brown color after an elapse of one month.

Example 2

(7) Hair dyeing was performed in the same manner as in Example 1 except that a platinum nanocolloid (manufactured by Johzen Co. Ltd.) was used in place of the gold nanocolloid used in Example 1, and evaluation was made. As a result, the hair was still uniformly dyed in Level 8 brown color after an elapse of one month.

Example 3

(8) Hair dyeing was performed in the same manner as in Example 1 except that the hair of a female subject with a lot of gray hair, in place of the female subject with black hair, was dyed, and evaluation was made. As a result, the brown dye at the dyed portion mostly remained after an elapse of one month, but the hair became somewhat grayish.

Example 4

(9) Hair dyeing was performed in the same manner as in Example 1 except that the hair of a female subject with a lot of gray hair, in place of the female subject with black hair, was dyed.

(10) Next, 25 g of tea powder (manufactured by ICTB global., Ltd.; tea color treatment powder, powder of fresh Japanese Uji tea) was dissolved in 175 g of lukewarm water, to prepare an aqueous solution of tea powder. Then, the prepared aqueous solution of tea powder was applied onto the hair. Then, the hair on which the aqueous solution of tea powder had been applied was left for 10 minutes, and thereafter irradiated with far-infrared radiation for about 20 minutes. At this time, the temperature of the hair was about 30° C. Then, the hair was further left for about 10 minutes.

(11) Then, the hair was washed with a commercially available shampoo. Then, the water on the hair was fully wiped off with a towel. As a result, after an elapse of one month, a clearly more amount of the brown dye at the dyed portion remained as compared with Example 3, and the gray hair became inconspicuous.

Comparative Example 1

(12) Hair dyeing was performed in the same manner as in Example 1 except that the gold nanocolloid was not added dropwise, and evaluation was made. As a result, after an elapse of one month, the color of the hair was too much brighter than the colors in Examples 1 and 2. This result showed that the adsorption of the basic dye was lower when the metal nanocolloid as used in Example 1 or 2 was not added dropwise.

INDUSTRIAL APPLICABILITY

(13) When hair dyeing is performed by using the hair coloring agent according to the present invention, it is possible to retain the color for a long period of time even in the case of using a basic dye as a base color. Accordingly, using a basic dye as a base color, the hair coloring agent of the present invention can be used as an alternative to the so-called permanent hair dye that enables long-term color retention, not for dyeing such as color treatment intended for short-term color retention. The hair coloring agent according to the present invention can be particularly preferably used for cosmetic hair dyeing.