JPS6237004B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is almost odorless and has a pH close to that of the skin.
Highly safe method 3 that oxidizes the melanin pigment in hair under mild conditions (weakly acidic to neutral).
This invention relates to a bleaching agent. Conventionally, the most widely used hair bleaching agent is one in which hydrogen peroxide is decomposed with an alkaline agent such as ammonia, and the generated oxygen from the generator oxidizes and bleaches melanin pigment. Its pH is as high as 9 to 10, which is not good for the skin and eye mucous membranes. Moreover, the bleaching effect is weak under normal treatment conditions (time, temperature), and if a sufficient effect is expected, peroxides such as alkaline perborates, persulfates, and percarbonates are usually used. It is used in combination with hydrogen oxide water, but the pH at the time of treatment is even higher, reaching 10 to 12, and the oxidizing power becomes stronger, so depending on how you handle it, the danger to the skin and mucous membranes increases, and the degree of hair damage may increase. It is hard to say that it is highly desirable. As a result of intensive research, the present inventors discovered that the first agent consisting of a sulfite or bisulfite and an organic solvent;
Consisting of a second agent containing iron salts and a third agent containing hydrogen peroxide, by sequentially processing the first, second and third agents, an unprecedented bleaching effect can be obtained. Moreover, we were able to obtain a highly safe three-part bleaching agent. The advantages of the three-part bleaching agent of the present invention are as follows: (a) It has an extremely excellent bleaching effect. (b) The conditions are mild, with a pH close to that of the skin (weakly acidic to neutral), the toxicity and irritation of the raw materials used are low, and overall high safety can be expected. As mentioned above, the basic bleaching mechanism of the present invention, which provides excellent bleaching effects in the weakly acidic to neutral range, will be explained. The sulfite or hydrogen sulfite contained in the first agent includes sodium sulfite, sodium hydrogen sulfite, potassium sulfite, potassium hydrogen sulfite, ammonium sulfite, ammonium hydrogen sulfite, ammonium hydrogen sulfite, monoethanolamine sulfite, and monoethanol hydrogen sulfite. Aqueous solutions such as amines are effective against hair keratin [1]
The reaction shown in the formula is carried out to partially cleave the disulfide bond. KSSK: disulfide bonds in hair keratin. XHSO ₃ , X ₂ SO ₃ ; X is sulfite, bisulfite
Na, K, _NH4 , etc. [1] The reaction shown in the formula is a reversible reaction, and by washing with water after hair treatment, excess sulfite ions (SO ₃ =) or hydrogen sulfite ions (HSO ₃ ^- ) are removed from the hair [1] The equilibrium of the formula shifts to the left and is mostly restored to disulfide bonds (KSSK). This reaction is most efficient in the weakly acidic to neutral pH range, and volatilization of hydrogen sulfide (H ₂ S) gas and ammonia (NH ₃ ) gas during the reaction is hardly observed, and sulfite (SO ₂ ) Gas is hardly volatilized at pH=5 to 8, making it possible to treat hair without odor. Book 1
Ethylene carbonate, propylene carbonate, γ-
Butyrolactone, ethyl alcohol, isopropyl alcohol, n-propyl alcohol n-
It is advantageous to use an organic solvent such as butyl alcohol or a hydrogen bond breaking agent such as urea in combination.
(Figure 1) Also, the higher the concentration of sulfite ions and hydrogen sulfite ions, the more effective they are (Figure 2), but the concentrations can be adjusted freely depending on the desired degree of bleaching. Usually 0.5 to 1.5 mol (liquid) is sufficient. As described above, the purpose of the first agent treatment is to facilitate the adsorption and absorption of the reagents in the subsequent second and third agents, thereby enhancing the bleaching effect. When the hair treated with the first agent is lightly washed with water and then treated with the second agent containing ferrous salt, ferrous ions (Fe ₂ +) are adsorbed into the hair, and in addition to hair keratin, ferrous ions (Fe 2 +) are absorbed into the hair. It is estimated that a complex is also formed with the melanin pigment in the form shown in formula [2]. The adsorption amount of Fe ²⁺ reaches its maximum when the pH during adsorption treatment is approximately 6, and the adsorption amount of Fe ²⁺ is small under acidic conditions, and Fe ²⁺ quickly forms hydroxide under alkaline conditions. However, it was also observed that the amount of adsorption decreased (Figure 3). In addition, the bleaching effect is approximately proportional to the adsorption amount of iron ions (Fe ²⁺ ),
The pH during treatment with the second agent was maximum at 5.5 to 6 (Figure 3). The ferrous salts to be mixed include ferrous sulfate, ferrous ammonium sulfate, and ferrous bromide.
Iron, ferrous chloride, ferrous lactate, ferrous oxalate
Inorganic salts and organic salts such as iron can be used. In the case of ferrous sulfate it will be 0.01-0.5 mol (liquid), preferably 0.05-0.3 mol (liquid) (ferrous sulfate).
figure). After lightly washing the hair in which ferrous ions (Fe ²⁺ ) have been adsorbed by the second agent treatment, a third agent treatment containing hydrogen peroxide is applied, and the hydrogen peroxide is absorbed into the first part of the melanin pigment. It is catalytically decomposed by iron ions (Fe ²⁺ ) as shown in formula [3], and the melanin pigment part is efficiently oxidized and decomposed to achieve bleaching. Fe ²⁺ +H ₂ O ₂ Fe ³⁺ +HO ^- +HO [3] It was confirmed that oxidative bleaching progresses more efficiently as the PH during the action of the third agent goes from acidic to alkaline; It was confirmed that sufficient bleaching was possible even in the sexual area (Figure 5). Moreover, it can be seen that at pH=7 to 8, the bleaching effect is several orders of magnitude higher than that of the conventional hydrogen peroxide-alkali system (Figure 5). The higher the hydrogen peroxide concentration in the second agent, the greater the bleaching effect (Figure 6), but it is usually 2 to 4
% is sufficient. Due to the mechanism described above, the bleaching agent of the present invention has a mild condition of PH almost close to that of the skin by making the first, second and third agents acting on the hair in this order. You can get an excellent bleaching effect below. German Patent Application No. 2021099 discloses an invention relating to a bleaching agent comprising a first part containing a ferrous salt and a second part containing hydrogen peroxide. That is, it is a bleaching agent consisting of a processing agent corresponding to the second agent and the third agent of the present invention. Therefore, the invention described in the specification of West German Patent Application No. 2021099 is based on the invention described in the specification of West German Patent Application No. 2021099.
This invention is fundamentally different from the present invention in that no agent is used. The difference is that in the present invention, the pH of the third agent, that is, the hydrogen peroxide agent, is 4 to 7.
In contrast, West German patent application publication no.
This is directly reflected in the difference in PH of the invention of No. 2021099, which is 8 to 11.
It is clear from FIG. 2 of the present invention that the bleaching effect is greatly inferior in the absence of treatment with sulfite or bisulfite. Next, experimental examples considered to be important in constructing the present invention will be described. Experimental example 1 Ethyl alcohol, urea and bleaching effect in the first agent (1) A hair sample (undamaged black hair of a woman in her 20s) washed and dried under certain conditions at 2gr was treated with the first agent of each formulation shown below. Treat with 20gr at 30℃ for 10 minutes. After treatment, rinse with water for 1 minute and wipe off excess water. [First agent] (%) Ammonium bisulfite aqueous solution (50%) 15.0 Ethyl alcohol 5, 10, 15, 20, 25 Urea 0, 5, 10, 15 Purified water to100.0 *PH is 6.5 with ammonia water Adjustment (2) Next, treat with 20 gr of the second agent shown below at 30°C for 10 minutes. After treatment, rinse with water for 1 minute and wipe off excess water. [Second agent] (%) Ferrous sulfate (FeSO _{4.7H 2} O) 8.34 L-ascorbic acid 0.5 Purified water to100 *PH was adjusted to 5.0 with sodium acetate (3) Finally, the third agent shown below 20gr, 30℃, 30
After a minute of treatment, the black hair will gradually undergo oxidative bleaching and turn into a blonde color. After treatment, perform the usual shampoo and rinse treatment and dry. [Third agent] (%) Hydrogen peroxide water reagent special grade (30%) 12.0 Isopropyl alcohol 10.0 Sequestering agent (EDTA-2Na) 0.2 Purified water to100.0 *PH adjusted to 7.0 with ammonium acetate (4) The color of bleached hair is measured using a spectrophotometer (Hitachi 607 Color Analyzer), and the color is converted to Hunter's (L, a, b) to determine its brightness [L-
value] was taken as the characteristic value of the degree of bleaching. (5) The obtained results are shown graphically in Figure 1. From this graph, it can be seen that the final bleaching effect is increased by incorporating ethyl alcohol and urea into the first agent. Experimental Example 2 Ammonium bisulfite concentration in the first agent and bleaching effect (1) The conditions were the same as in Experimental Example 1, except that the formulation of the first agent was changed to the following formulation and the concentration of bisulfite was changed (but The first hair sample was undamaged black hair from a woman in her 20s who was different from the hair sample in Experimental Example 1.
Bleached hair was obtained by treatment with the agent, the second agent, and the third agent, and characteristic values of the degree of bleaching were obtained in the same manner as in Experimental Example 1. [First agent] (%) Ammonium bisulfite aqueous solution (50%) 0,
2, 5, 10, 12, 14, 16, 18, 20, 22, 24,
26, 28, 30 Ethylene carbonate 15 Ethyl alcohol 15 Purified water to100.0 *PH was adjusted to 6.5 with ammonia water (2) The obtained results are shown in Figure 2. The higher the ammonium bisulfite concentration, the greater the final bleaching effect, but usually 0.5 to 1.5 mol (liquid) is sufficient. Experimental example 3 Adsorption amount of iron ions and bleaching effect due to difference in PH of the second agent (1) The PH of the system was changed by fixing the first agent to the following formulation and changing the second agent to the following formulation. The other conditions were the same as in Experimental Example 1 (however, the hair samples were undamaged black hair from a woman in her 20s who was different from the hair samples in Experimental Examples 1 and 2). The hair was treated with a bleaching agent to obtain bleached hair, and the characteristic value of the degree of bleaching was obtained in the same manner as in Experimental Example 1. [First agent] (%) Ammonium bisulfite aqueous solution (50%) 20.0 Ethylene carbonate 15.0 Ethyl alcohol 15.0 Purified water to100.0 PH=6.5 (ammonia water adjustment) [Second agent] (%) Ferrous sulfate (FeSO ₄・7H ₂ O) 8.34 L-ascorbic acid 0.5 Purified water to100.0 PH＝2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0,
5.5, 6.0, 6.5 Acetic acid-sodium acetate buffer solution [Part 3] Same as Experimental Example 1 (2) Hair treated with Part 1 and Part 2 above was washed with water for 1 minute, dried, and left indoors for 1 day and night. The amount of Fe adsorbed in this hair was measured. The measurement is performed by heating and dissolving a certain amount of treated hair with nitric acid or sulfuric acid and using atomic absorption spectrometry (Jarrell Ash AAIE).
I went with (type). (3) Figure 3 shows the adsorption amount of iron ions and bleaching effect due to differences in pH. The bleaching effect shows its maximum at a pH of about 6, and in the same way, the adsorption amount of iron ions also shows its maximum at a pH of about 5.5 to 6. Experimental example 4 Concentration of ferrous sulfate in the second agent and bleaching effect (1) The formulation of the first agent was the same as in Experimental example 3, and the formulation of the second agent was as follows, and the amount of ferrous sulfate was The first agent, A second agent and a third agent treatment were performed to obtain bleached hair, and the characteristic value of the degree of bleaching was obtained in the same manner as in Experimental Example 1. [First agent] Same as Experimental Example 3. [Second agent] Ferrous sulfate [FeSO ₄ 7H ₂ O] 0.01, 0.05,
0.10, 0.20, 0.30, 0.40, 0.5 [mol (liquid) equivalent] L-ascorbic acid 0.5 (%) Purified water to100.0 (%) *PH = 5.0 (adjusted with sodium acetate) [3rd agent] Experiment Same as example 1. (2) The results are shown in Figure 4. Usually, a ferrous ion concentration of 0.05 to 0.3 mol (liquid) is sufficient. Experimental example 5 Bleach effect due to difference in the PH of the third agent (1) The PH of the system was changed by changing the formulation of the first agent to the following formulation and the formulation of the third agent to the following, and other experimental examples. The first agent, the second agent, under the same conditions as 1.
A third agent treatment was performed to obtain bleached hair, and the characteristic value of the degree of bleaching was obtained in the same manner as in Experimental Example 1. [Part 1] (%) Aqueous ammonium bisulfite solution (50%) 25.0 Ethylene carbonate 15.0 Ethyl alcohol 15.0 Purified water to100.0 *PH=6.0 (adjusted with aqueous ammonia) [Part 2] Same as Experimental Example 1 [Part 2] 3 agents] (%) Hydrogen peroxide water reagent special grade (30%) 12.0 Isopropyl alcohol 10.0 Sequestering agent (EDTA-2Na) 0.2 Purified water to100.0 *PH=2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
9.0, 10.0 PH adjustment; acetic acid-sodium acetate buffer and aqueous ammonia (2) Also, as a substitute for the conventional hydrogen peroxide-ammonia bleaching agent, bleaching treatment was also performed using only the third agent. (3) FIG. 5 shows the bleaching effect of the combination of the first agent, second agent, and third agent according to the present invention, depending on the PH of the third agent. As an alternative to traditional bleach,
The bleaching effect obtained by treatment with only the third agent is also shown in FIG. 5 at the same time. The effect of the bleaching agent of the present invention is that of the third agent.
It can be seen that it is very effective even when the pH is neutral, and is superior to conventional bleaching agents with a pH of 10. Experimental Example 6 Hydrogen peroxide concentration in the third agent and bleaching effect (1) The formulation of the first agent was the same as in Experimental Example 5, the third agent was changed to the following formulation, and the concentration of hydrogen peroxide was varied. In addition, the first experiment was conducted under the same conditions as Experimental Example 1.
Bleached hair was obtained by applying a third agent, a second agent, and a third agent, and the characteristic value of the degree of bleaching was obtained in the same manner as in Experimental Example 1. [First agent] Same as Experimental Example 5. [Second Agent] Same as Experimental Example 1. [Third agent] Hydrogen peroxide (effective concentration) 0.5, 1.0, 1.5, 2.0,
2.5, 3.0, 3.5, 4.0, 4.5, 5.0% Isopropyl alcohol 10.0% Sequestering agent (EDTA-2Na) 0.2% Purified water to100.0% *PH=5 (PH adjusted with sodium acetate) (2) Results It is shown in FIG. As the hydrogen peroxide concentration increases, the bleaching effect also increases. Normal 2
~4% may be sufficient. As mentioned above, in Experimental Examples 1 to 6, undamaged black hair from women in their 20s was used, but the hair that can be obtained from one person's head is limited. Therefore, in a series of experiments, i.e. Experimental Example 1, Experimental Example 1 was conducted using the same person's hair, but a series of other experiments,
For example, Experimental Example 2 uses other people's hair. As is well known, the degree of bleaching of hair varies depending on its thickness, color, and health level. For this reason, there are variations in the degree of bleaching between FIGS. 1 to 6, particularly between FIGS. 2 and 5. In order to obtain the correlation between FIG. 2 and FIG. 5, the following experiment was conducted. Experimental Example 7 Hair Sample A: One sample of 2 gr of hair used in Experimental Example 5 was prepared as hair sample A. Hair sample B: Two samples of 2 gr of hair used in Experimental Example 2 were prepared as hair sample B. Hair sample A1 sample and hair sample B1 sample were treated with the first agent, second agent, and third agent shown below in the same procedure as in Experimental Example 1 to obtain bleached hair, and Experimental Example 1
The characteristic value of the degree of bleaching was obtained in the same manner. [Part 1] Ammonium hydrogen sulfite aqueous solution (50%) 25 (%) Ethylene carbonate 15 Ethyl alcohol 15 Purified water Balance *pH adjusted to 6.5 with ammonia water [Part 2] Ferrous sulfate 8.34 (%) L - Ascorbic acid 0.5 Purified water balance *PH is adjusted to 5.0 with sodium acetate [3rd agent] Hydrogen peroxide solution (30%) 12 Isopropyl alcohol 10 Sequestering agent (EDTA-2Na) 0.2 Purified water Balance *PH is Adjustment to 7.0 with ammonium acetate The remaining hair sample B1 was treated with only a third agent as a substitute for the conventional bleaching agent, and the degree of bleaching was also measured. The results are shown in Table 1.

[Table] From the results in Table 1, hair sample B is very difficult to bleach, and this shows that hair sample B is very difficult to bleach.
It can be seen that this was the cause of the difference in the experimental results shown in the figure. Furthermore, it has become clear that, compared to conventional bleaching agents, the bleaching agent of the present invention has a low pH, that is, can bleach hair under mild conditions without impairing the bleaching effect. Experiment 8 Bleach effect when using the first agent (1) The formulations of the first agent, second agent, and third agent were as follows, and the conditions were the same as in Experimental Example 1 (however, the hair sample was 20 hairs from a different person than the hair samples in each experimental example.
Saiyo girl with undamaged black hair (the same applies hereafter) ranks first
Bleach-treated hair was obtained by performing the treatment with the agent, the second agent, and the third agent under conditions where the pH was approximately neutral, and the characteristic value of the degree of bleaching was obtained in the same manner as in Experimental Example 1. The results are shown in Table 2. [First agent] (%) Ammonium bisulfite aqueous solution (50%) 20 Ethylene carbonate 15 Ethyl alcohol 15 Purified water to100.0 *PH adjusted to 6.5 with ammonia water [Second agent] (%) Ferrous sulfate ( _FeSO4・_7H2O ) (0.12mol/)
5.15 L ascorbic acid 0.5 Purified water to100.0 *PH was adjusted to 5.5 with sodium acetate. [Third agent] (%) Hydrogen peroxide water reagent special grade (30%) 12.0 Isopropyl alcohol 10.0 Polyoxyethylene (40E0) lauryl ether 1.0 Purified water to100.0 (PH=5.0) (2) Second and third agent The formulation of the agent was the same as the second and third agents in (1) above, and the second and third agents were treated under the same conditions as in (1) above, except for the treatment with the first agent. Experimental Example 1
The characteristic value of the degree of bleaching was obtained in the same manner. The results are shown in Table 2.

[First agent]

Ammonium bisulfite solution (60%) 20.0% Imidazole amphoteric surfactant 10.0 Oleyl alcohol ethylene oxide (20 mol)
Adduct 1.0 Hydroxyethyl cellulose 0.5 Ethylene carbonate 15.0 Ethyl alcohol 15.0 Propylene glycol 2.0 Purified water 36.5 Total 100.0% (PH=6.5) [Second agent] Ferrous sulfate 2.78% Oleyl alcohol ethylene oxide (20 mol)
Adduct 1.0 Hydroxyethyl cellulose 0.5 L-ascorbic acid 0.5 Propylene glycol 2.0 Sodium acetate 3.2% Purified water 90.02 Total 100.00% (PH=5.5) *Ferrous sulfate is gradually oxidized in a weakly acidic aqueous solution to basic ferric sulfate Normally, sulfuric acid
Iron is dissolved and used during treatment. [Third agent] A Hydrogen peroxide water reagent 1st grade (28%) 21.5% Hydrogen peroxide stabilizer Appropriate amount of purified water 78.5 Total 100.0% B Oleyl alcohol ethylene oxide (20 mol) adduct 1.0% Hydroxyethyl cellulose 1.0 Propylene glycol 2.0 Sequestering agent: Appropriate amount of sodium acetate Appropriate amount of purified water 96.0 Total 100.0% Mix A and B at a 1:1 ratio during treatment. Adjust the pH of the mixture to 6.5 with the amount of sodium acetate. First, apply about 100g of [Part 1] to the hair (head hair), leave it for 10 to 15 minutes, then wash with water and wipe off excess water with a towel. Next, apply about 100g of [second agent], leave it for 10 to 15 minutes, then wash it with water and wipe it off with a towel in the same way.
Finally, apply about 100g of [3rd agent] and leave it alone.
For normal hair, sufficient bleaching can be achieved after about 10 to 15 minutes, but the leaving time is determined depending on the hair type and the desired degree of bleaching. If you leave it for about 30 minutes, the bleaching will progress considerably and you will get light brown bleached hair. Example 2 [Part 1] Ammonium bisulfite solution (60%) 15.0% Isostearyl alcohol ethylene oxide (20
Mol) adduct 1.0 Carboxymethyl cellulose 0.5 Isopropyl alcohol 10.0 Propylene glycol 2.0 Urea 15.0 Purified water 56.5 Total 100.0 (PH=6.5) [Second agent] Ferrous sulfate 2.78% Isostearyl alcohol ethylene oxide (20
Mol) adduct 1.0 Carboxymethyl cellulose 0.5 L-ascorbic acid 0.5 Propylene glycol 2.0 Sodium acetate 3.2 Purified water 90.02 Total 100.00% (PH=5.5) [3rd agent] Hydrogen peroxide water reagent 1st class (28%) 7.1% Setanol 2.5 Sodium lauryl sulfate 1.0 Hydrogen peroxide stabilizer Appropriate amount of purified water 89.4 Total 100.0% (PH = 4.0) First, apply about 20g of [first agent] to hands and feet, and apply it for 10~
Leave for 15 minutes. Then wash with water and wipe off excess water with a towel. Next, apply about 20 gr of [second agent],
Leave it on for 10 to 15 minutes, then wash it in the same way and wipe it off with a towel.Finally, apply the third agent and leave it on for about 20 minutes.The unwanted hair on your hands and feet will gradually bleach and become less noticeable. Once the desired level of bleaching has been achieved, wash with water and wipe dry with a towel. Example 3 [Part 1] Sodium hydrogen sulfite 9.5% Isostearyl alcohol ethylene oxide (20
Mol) adduct 1.0 Xanthan gum 1.0 Ethyl alcohol 10.0 Glycerin 5.0 Urea 15.0 Purified water 58.5 100.0% (PH=6.5) [Second agent] Ferrous ammonium sulfate 3.9% Isostearyl alcohol ethylene oxide (20
Mol) adduct 1.0 Carboxymethyl cellulose 0.5 Glycerin 2.0 L-ascorbic acid 0.5 Sodium acetate Appropriate amount of purified water 92.1 Total 100.0% (PH=5.5) [Third agent] Hydrogen peroxide water reagent 1st class (28%) 10.7% Setanol 2.5 Sodium lauryl sulfate 1.0 Hydrogen peroxide stabilizer Appropriate amount of purified water 85.8 Total 100.0% (PH = 4.0) First, apply about 20g of [first agent] to hands and feet, and apply it for 10~
Leave for 15 minutes. After wiping with a cold towel [Second
Apply approx. 20 gr of agent, leave it for 10 to 15 minutes, wipe off with a washed towel, and finally apply approx. It will be bleached. Example 4 [Part 1] Ammonium bisulfite solution (60%) 15.0% Imidazole amphoteric surfactant 10.0 Oleyl alcohol ethylene oxide (20 mol)
Adduct 2.0 Lauric acid diethanolamide 1.5 Ethyl alcohol 15.0 Urea 15.0 Purified water 41.5 Total 100.0% (PH=6.5) [Second agent] Ferrous chloride 3.0% Isostearyl alcohol ethylene oxide (20
Mol) adduct 2.0 Hydroxyethyl cellulose 0.5 L-ascorbic acid 0.5 Glycerin 3.0 Sodium acetate Appropriate amount of purified water 91.0 Total 100.0% (PH=6.0) [Third agent] A Hydrogen peroxide water reagent 1st class (28%) 21.5% Setanol 2.5 Sodium lauryl sulfate 1.0 Hydrogen peroxide stabilizer Appropriate amount Purified water 75.0 Total 100.0% B Isostearyl alcohol ethylene oxide (20 mol) adduct 1.0% Carboxyl methyl cellulose 0.5 Propylene glycol 2.0 Preservative Appropriate amount Ethylenediaminetetraacetic acid disodium 0.2 Sodium acetate Appropriate amount Purified water 96.3 Total 100.0% During treatment, mix A and B in a 1:1 ratio. Adjust the pH of the mixture to 7.0 with the amount of sodium acetate. First, apply about 100g of [Part 1] to the hair (hair), leave it for 10 to 15 minutes, then wash with water and wipe off excess water with a towel. Next, [second agent] approx.
Apply 100gr and leave it alone. After about 20 minutes, wash with water, towel dry, and apply [3rd agent] about 100gr.
Leave it for a minute, then wash with water, shampoo, rinse and dry.
Normal hair is bleached to a slightly darker brown. Example 5 [First agent] Sodium sulfite 10.0% Polyoxyethylene polyoxypropylene copolymer 3.0% Propylene glycol 2.0 γ-butyrolactone 10.0 Urea 15.0 Citric acid Appropriate amount of purified water 60.0 Total 100.0% (PH=6.5) [Second Agent] Ferrous sulfate 2.78% Oleyl alcohol ethylene oxide (20 mol)
Adduct 1.0 Polyoxyethylene polyoxypropylene copolymer 2.0 L-ascorbic acid 0.5 Propylene glycol 2.0 Sodium acetate 3.2 Purified water 88.52 Total 100.00% (PH=5.5) [Third agent] Hydrogen peroxide water reagent 1st grade (28% ) 10.7% Setanol 2.5 Sodium lauryl sulfate 1.0 Hydrogen peroxide stabilizer Appropriate amount Disodium ethylenediaminetetraacetate 0.2 Purified water 85.6 Total 100.0% (PH=4) First, apply about 20g of [Part 1] to hands and feet. ,Ten~
Leave for 15 minutes. Then wash it with water and wipe it with a towel. Next, apply about 20g of [second agent] and leave it for 10 to 15 minutes, wash with water and wipe with a towel. Finally, about 20 minutes after applying [3rd agent], the unwanted hair on your hands and legs will be bleached and become less noticeable.

[Brief explanation of the drawing]

1 to 6 are graphs showing the bleaching effect of the bleaching agent of the present invention, FIG. 1 is a graph showing the effect of adding urea and ethyl alcohol to the first agent, and FIG. 2 is a graph showing the effect of adding urea and ethyl alcohol to the first agent. Figure 3 is a graph showing the relationship between the pH value of the second agent and the iron ion adsorption amount and degree of bleaching. Figure 4 is a graph showing the relationship between the sodium bisulfite concentration in the second agent and the degree of bleaching. It is a graph showing the relationship between ion concentration and bleaching degree.
FIGS. 5 and 6 are graphs showing the influence of the PH value and hydrogen peroxide concentration of the third agent on the bleaching effect, respectively.

Claims (1)

[Claims] 1. A first agent containing a sulfite or hydrogen sulfite and an organic solvent and exhibiting a pH of 5 to 8; a first agent containing a ferrous salt and exhibiting a pH of 4;
A second agent showing a pH of 4 to 7, containing hydrogen peroxide and a pH of 4 to 7.
A three-part bleaching agent consisting of a third part that shows. 2 Claim 1 in which the concentration of sulfite or bisulfite in the first agent is 0.1 to 2.0 mol (liquid)
Bleach agent as described in section. 3 The iron ion concentration of the ferrous salt in the second agent is 0.01
The bleaching agent according to any one of claims 1 to 2, which has a content of 0.5 mol (liquid). 4. The bleaching agent according to any one of claims 1 to 3, wherein the concentration of hydrogen peroxide in the third agent is 0.5 to 5.0%.