JP7402603B2 - Pretreatment agent and oxidative hair dyeing or bleaching method - Google Patents

Description

The present invention relates to a pretreatment agent that is used by applying an oxidative hair dye or bleaching agent to the hair, and an oxidative hair dyeing or bleaching method that includes a step of using the pretreatment agent. .

In oxidative hair dyeing methods that use oxidizing hair dyes that contain alkaline agents such as ammonia and oxidizing agents such as persulfates and hydrogen peroxide, and bleaching methods, alkaline agents are applied to the hair surface. Opens the hair cuticle, making it easier for oxidative hair dyes and bleaching agents to penetrate into the hair. This state of easy penetration can be said to be a state in which the proteins inside the hair tend to leak out, and protein leakage is directly linked to hair damage. Such damage usually accumulates closer to the ends of the hair.

Regardless of the extent of damage accumulation, inhibition of hair damage is desirable. In response to this, it is known to apply a pretreatment agent before applying an oxidative hair dye or bleaching agent to the hair. For example, in Patent Document 1, a hair treatment composition consisting of a first part and a second part is used as a pretreatment agent, the first part contains 0.5 to 4% by mass of cystine and an alkaline agent, and has a pH of 8.5. -11, and the second agent contains an organic acid and has a pH of 3 to 5 (see claims 1, 2, and 4 of Patent Document 1).

Japanese Patent Application Publication No. 2014-80384

However, the two-part pretreatment agent disclosed in Patent Document 1 is more complicated to manufacture and use than the one-part pretreatment agent. Desirably, the pretreatment agent is a one-part pretreatment agent that can suppress hair damage to the same degree or more as a two-part method.

In view of the above circumstances, the present invention aims to provide a one-component pretreatment agent that is excellent in suppressing hair damage, as well as an oxidative hair dyeing method and a bleaching method using this pretreatment agent.

As a result of extensive research, the present inventors have discovered that the use of an acidic one-part pretreatment agent containing a specific organic acid is effective in suppressing the decrease in initial elastic modulus, which is an indicator of hair damage. The present invention has now been completed.

That is, the pretreatment agent according to the present invention is applied to hair before applying an oxidative hair dye or bleaching agent, and contains one or more selected from citric acid, levulinic acid, and maleic acid. It is characterized by being formulated, acidic, and a one-drug formula.

The pretreatment agent according to the present invention preferably has a pH of 5.0 or less. Within this pH range, the reduction in initial elastic modulus is better suppressed.

In the pretreatment agent according to the present invention, the total amount of citric acid, levulinic acid, and maleic acid is preferably 1% by mass or more. This total amount is more effective in suppressing a decrease in initial elastic modulus.

The oxidative hair dyeing method or bleaching method according to the present invention includes applying to hair an acidic, one-part pretreatment agent containing one or more selected from citric acid, levulinic acid, and maleic acid. The method is characterized by comprising a pretreatment step of applying the oxidative hair dye or bleaching agent, and an oxidizing hair dyeing treatment step or a decoloring treatment step of applying the oxidative hair dye or bleaching agent in layers.

According to the one-component pretreatment agent according to the present invention, since it is an acidic one containing one or more selected from citric acid, levulinic acid, and maleic acid, it can be used for oxidative hair dyeing or bleaching treatment. Excellent in suppressing hair damage caused by hair loss.

Further, according to the oxidative hair dyeing method or bleaching method according to the present invention, the pretreatment agent is acidic and is a one-component type, which contains one or more selected from citric acid, levulinic acid, and maleic acid. Since it includes a pretreatment step of applying the hair to the hair, it is excellent in suppressing hair damage caused by oxidative hair dyeing or bleaching.

The invention will be described below based on embodiments of the invention.
The pretreatment agent according to the present embodiment is a mixture of one or more selected from citric acid, levulinic acid, and maleic acid and water (the amount of water blended is, for example, 80% by mass or more). ). In addition, raw materials used in known pretreatment agents may be further blended as optional raw materials.

As described above, the pretreatment agent of this embodiment contains one or more selected from citric acid, levulinic acid, and maleic acid, and citric acid is preferably blended. The total blending amount of citric acid, levulinic acid, and maleic acid at this time is preferably 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more from the viewpoint of suppressing hair damage. The upper limit of the total blending amount is, for example, 10% by mass. When blending citric acid, the blending amount of citric acid is preferably 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more, from the viewpoint of suppressing hair damage. When blending levulinic acid, the blending amount of levulinic acid is preferably 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more, from the viewpoint of suppressing hair damage. Further, when blending maleic acid, the blending amount of maleic acid is preferably 1% by mass or more, preferably 3% by mass or more, and more preferably 5% by mass or more from the viewpoint of suppressing hair damage.

Examples of the above-mentioned optional raw materials include surfactants, polyhydric alcohols, polymer compounds, preservatives, pH adjusters, fragrances, and the like.

The pretreatment agent of this embodiment is acidic, and from the viewpoint of suppressing hair damage, the pH of the pretreatment agent is preferably 5.0 or less, preferably 4.0 or less. The lower limit of this pH is, for example, 3.0. If the pH needs to be adjusted, it may be adjusted using a known alkali such as arginine.

The pretreatment agent of this embodiment preferably has a liquid form that has excellent permeability into the hair. The viscosity of the pretreatment agent at this time is, for example, 1000 mPa·s or less. The viscosity means the value measured 60 seconds after the start of measurement using a B-type viscometer with an appropriate rotor at 25° C. and a rotor rotation speed of 12 rpm.

The pretreatment agent of the present embodiment is a one-component type consisting of one agent, and is used by applying it to hair before oxidative hair dyeing or bleaching. In addition, if the hair before applying the pretreatment agent of this embodiment needs to be washed, it is washed using a shampoo composition containing an anionic surfactant or the like.

The oxidative hair dyeing method of the present embodiment includes a pretreatment step of applying the pretreatment agent of the present embodiment to hair, and an oxidative hair dyeing step of applying the oxidative hair dye in layers. The pretreatment step and the oxidative hair dyeing treatment step are continuous, and no other treatments such as washing or heating the hair are performed between the two steps.

In the oxidative hair dyeing process, hair is dyed using an oxidative hair dye, similar to known oxidative hair dyeing processes. The oxidative hair dye used here is preferably a known oxidative hair dye.

Examples of the above-mentioned oxidative hair dyes include alkaline ones containing an oxidizing dye, an alkaline agent, and an oxidizing agent. Note that the formulation of the oxidative hair dye is preferably cream-like in consideration of handling properties such as application to hair and dripping.

As the oxidation dye in the above-mentioned oxidation hair dye, one or more selected from known dye intermediates that develop color by themselves through an oxidation reaction are employed. Examples of the dye intermediate include phenylenediamine derivatives such as toluene-2,5-diamine sulfate, nitroparaphenylenediamine hydrochloride, and paraphenylenediamine. Further, as the oxidation dye, one or more kinds selected from known couplers that exhibit a color tone when oxidized by a dye intermediate may be used. Examples of the coupler include phenylenediamine derivatives such as 2,4-diaminophenoxyethanol hydrochloride and metaphenylenediamine hydrochloride; aminophenol derivatives such as 5-aminoorthocresol and meta-aminophenol; and resorcinol.

The alkaline agents in the oxidative hair dyes listed above promote the action of the oxidizing agent contained in the oxidative hair dyes, and also improve the dyeability by swelling the hair and improving the permeability of the dye into the hair. Improve. The alkaline agents include metal hydroxides such as sodium hydroxide and potassium hydroxide; metal carbonates such as sodium carbonate and potassium carbonate; metal phosphates such as sodium phosphate; ammonia; ammonium such as ammonium carbonate and ammonium sulfate; Salts; alkanolamines such as monoethanolamine, triethanolamine, and isopropanolamine; basic amino acids such as arginine; and the like.

Examples of the oxidizing agent in the above-mentioned oxidative hair dye include hydrogen peroxide.

The above-exemplified oxidative hair dye is alkaline, but the pH of the oxidative hair dye is 9.0 or more and 11.0 or less in order to have good dyeability and reduce irritation to the scalp. 9.5 or more and 10.5 or less is good.

The bleaching method of the present embodiment includes a pretreatment step of applying the pretreatment agent of the present embodiment to hair, and a bleaching treatment step of overlappingly applying the bleaching agent to the hair to which the pretreatment agent has been applied. The pretreatment step and the bleaching treatment step are continuous, and no other treatments such as washing or heating the hair are performed between the two steps.

In the bleaching treatment step, similar to known bleaching treatments, a bleaching agent is used to oxidize and bleach hair melanin. The decolorizing agent used here is preferably a known decolorizing agent.

Examples of the above-mentioned decolorizing agent include alkaline agents containing an alkaline agent and an oxidizing agent. Note that the dosage form of the bleaching agent is preferably cream-like in consideration of handling properties such as application to hair and dripping.

The alkaline agent in the bleaching agent exemplified above not only promotes the action of the oxidizing agent, but also swells the hair and improves the permeability of the bleaching agent into the hair. The alkaline agents include metal hydroxides such as sodium hydroxide and potassium hydroxide; metal carbonates such as sodium carbonate and potassium carbonate; metal phosphates such as sodium phosphate; ammonia; ammonium such as ammonium carbonate and ammonium sulfate; Salts; alkanolamines such as monoethanolamine, triethanolamine, and isopropanolamine; basic amino acids such as arginine; and the like.

Examples of the oxidizing agent in the above-mentioned decolorizing agent include persulfate and hydrogen peroxide.

The above-mentioned bleaching agent is alkaline, but the pH of the bleaching agent is 9.0 or more and 11.0 or less, and 9.5 or more in order to have good bleaching properties and reduce irritation to the scalp. 10.5 or less is good.

The present invention will be described in detail below based on Examples, but the present invention should not be interpreted as being limited based on the description of these Examples.

Pretreatment agents of Examples and Comparative Examples were manufactured, and treatments were performed with these pretreatment agents and decolorizing agents. Details are as follows.

(Examples 1a to 1c, Comparative Examples 1a to 1c)
By blending citric acid, levulinic acid, maleic acid, glycolic acid, or malic acid with water and adjusting the pH to 3.5 with arginine, the liquid preparations of Examples 1a to 1c and Comparative Examples 1a to 1b were prepared. A processing agent was obtained (the amounts of citric acid and the like are shown in Table 1 below).

A plurality of hair bundles approximately 18 cm long and weighing 0.5 g were prepared from Japanese women. After applying 0.2 g of the pre-treatment agent of any of Examples 1a to 1c and Comparative Examples 1a to 1b to each hair bundle, without washing off the pre-treatment agent, apply 2.0 g of a bleaching agent (manufactured by Milbon Co., Ltd.). A mixture of 0.5 parts by mass of "Powder Bleach" and 1.5 parts by mass of "Ordeve Addixie Oxidan 6.0" manufactured by Milbon was applied in layers and left at room temperature for 30 minutes. After that, the hair strands are washed with water, further washed with Milbon's shampoo "Neidoue Willow Luxe Shampoo", and then treated with Milbon's wash-off treatment "Neidoue Willow Luxe Treatment". , and dried with warm air. The process from applying the pretreatment agent to drying was performed a total of three times.

Further, as Comparative Example 1c, the same treatment as in Example 1a was performed except that the application of the pretreatment agent was omitted.

The hair bundles after the above three treatments were treated using "TENSILON UTM-II-20" manufactured by Orientech Co., Ltd. for 12 hours or more in a constant temperature and humidity room maintained at a unit cross-sectional area (25°C, 50% RH). After conditioning the humidity, the initial elastic modulus (calculated from the hair diameter measured using a hair diameter measuring device) was measured. The measurement conditions were that the hair sample was immersed in water for 12 hours or more before the measurement, the hair sample was immersed in water during the measurement, the temperature was 25°C, the pulling speed was 2 mm/min, and the hair sample pulling interval was 20 mm.

Table 1 below shows the initial elastic modulus results along with the blended components and pH. Note that each initial elastic modulus in Table 1 below is an average value of five hairs.

In Table 1 above, Examples 1a to 1c, which used a pretreatment agent containing citric acid, levulinic acid, or maleic acid, had better initial elastic modulus than Comparative Example 1c, which did not use a pretreatment agent. You can check. On the other hand, it can be confirmed that Comparative Examples 1a and 1b, which used a pretreatment agent containing glycolic acid or malic acid, had an initial elastic modulus equal to or lower than Comparative Example 1c, which did not use a pretreatment agent.

(Reference example, Example 2, Comparative example 2)
A comparison was made with a two-part hair treatment composition (two-part pre-treatment agent) described in JP-A-2014-80384. The details are shown below.

A first part and a second part were produced according to Example 8 of JP-A-2014-80384. For the first agent, a white liquid emulsion was produced by blending cystine, sodium hydroxide, stearyltrimethylammonium chloride, isopropanol, cetearyl alcohol, and water, and adjusting the pH to 10.5 with levulinic acid. (The amounts of ingredients mixed with water are shown in Table 2 below.) In addition, the second agent was prepared in liquid form by blending tartaric acid, levulinic acid, and water, and adjusting the pH to 3.5 with sodium hydroxide (the amounts of the components blended with water are shown in the table below). As per 2).

A reference example was carried out as follows. Hair bundles approximately 18 cm in length and 0.5 g were collected from a Japanese woman. After applying 0.1 g of the above first agent to this hair bundle, after 3 minutes at room temperature, without rinsing off the first agent, apply 0.1 g of the above second agent, and leave it at room temperature for 5 minutes. Leave it for a minute. Then, without washing away the second agent, 4 g of decolorizing agent (a mixture of 1 part by mass of Milbon's "Powder Bleach" and 3 parts by mass of Milbon's "Ordeve Addixie Oxidan 6.0") was applied in layers. , and left at room temperature for 30 minutes. After that, the hair strands are washed with water, further washed with Milbon's shampoo "Neidoue Willow Luxe Shampoo", and then treated with Milbon's wash-off treatment "Neidoue Willow Luxe Treatment". , and dried with warm air.

In addition, as Example 2, the same treatment as in the reference example was performed except that the application of the first agent in the treatment of the reference example was omitted and the amount of the second agent to be applied was 0.2 g, and comparative example 2 The same treatment as in Example 2 was performed except that the application of the second agent in the treatment in Example 2 was omitted.

Table 2 below shows the components mixed with water, the pH, and the results of the initial elastic modulus (measurement method is the same as in Example 1a). In addition, each initial elastic modulus in Table 2 below is an average value of 20 hairs.

In Table 2 above, it can be confirmed that both Reference Example and Example 2 were superior to Comparative Example 2 in initial elastic modulus. It can be confirmed that Example 2 in which the application of the first agent was omitted had the same initial elastic modulus as the Reference Example without such omission.

Claims (5)

A pretreatment agent applied to hair before applying an oxidative hair dye or bleaching agent,
Contains one or more selected from citric acid, levulinic acid and maleic acid,
It is acidic and a one-drug formula,
A pretreatment agent characterized in that one or two selected from the above levulinic acid and the above maleic acid are blended as essential components . The pretreatment agent according to claim 1, which has a pH of 5.0 or less. The pretreatment agent according to claim 1 or 2, wherein the total amount of citric acid, levulinic acid, and maleic acid is 1% by mass or more. The pretreatment agent according to any one of claims 1 to 3, further comprising arginine. a pretreatment step of applying to the hair an acidic, one-part pretreatment agent containing one or more selected from citric acid, levulinic acid, and maleic acid;
an oxidative hair dyeing process or a bleaching process in which oxidative hair dyes or bleaching agents are applied in layers ;
An oxidative hair dyeing or bleaching method , wherein the pretreatment agent contains one or two selected from the levulinic acid and the maleic acid as essential ingredients .