JP2020097545A - Hair shampoo for dyeing - Google Patents

Abstract

To provide a shampoo that can suppress color fading of dyed hair while maintaining good washability.SOLUTION: A hair shampoo for dyeing contains acyl alanine sodium 7-12 mass%, imidazolinium betaine 7-12 mass%, and cocamide methyl monoethanolamine 1-5 mass%.SELECTED DRAWING: None

Description

The present invention relates to a shampoo, and more particularly to an improvement in a dye-treated hair shampoo having a dye loss preventing function.

Shampoo is often used to wash hair and scalp, and excess sebum and dirt can be removed.
On the other hand, various hair colors, color rinses, oxidative hair dyes, etc. are used according to the various tastes of consumers, and ordinary shampoos also fade these dyeings.
Therefore, there is a demand for a shampoo capable of suppressing discoloration of dye-treated hair while maintaining the cleanability of the hair (Patent Documents 1 and 2).

Patent No. 4130292 WO2012/161214

However, the conventional dye-treated hair shampoo is insufficient for suppressing discoloration while maintaining sufficient detergency.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a shampoo capable of suppressing discoloration of dye-treated hair.

In order to achieve the above object, the shampoo for dyeing-treated hair according to the present invention comprises:
7 to 12 mass% of acylmethylalanine salt,
Imidazolinium betaine 7 to 12% by mass,
1-5% by mass of cocamidomethyl monoethanolamine,
It is characterized by including.

Further, in the present invention, it is preferable that the cationic polymer further contains 0.2 to 1.0% by mass.

Further, in the present invention, the pH of the shampoo is preferably 6.0±0.5.

Further, in the present invention, it is preferable that the surfactant other than the three kinds of acylmethylalanine salt, imidazolinium betaine, and cocamidomethylmonoethanolamine is 5% by mass or less in the composition.

Further, in the present invention, it is preferable that the alkyl ether sulfate, the acylmethyl taurine salt, and the acyl glutamate salt are not substantially contained. Here, "not substantially containing" means that the content of each component is 1% by mass or less.

In the present invention, the acylmethylalanine salt is an anionic surfactant, and examples thereof include lauroylmethylalanine Na, lauroylmethylalanine TEA, cocoylmethylalanine Na, and the like, with lauroylmethylalanine Na being particularly preferred, and blending in a shampoo. The amount is preferably 7 to 12% by mass.
Examples of commercially available products include Alaninate LN-30 (manufactured by Nippon Surfactant Co.).

Further, in the present invention, imidazolinium betaine is an amphoteric surfactant, N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazo. Examples thereof include linium betaine, and N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium is particularly preferable, and the compounding amount thereof in the shampoo is preferably 7 to 12% by mass.
Examples of commercially available products include softazoline LHL-SF and softazoline CH (all manufactured by Kawaken File Chemicals).

Further, in the present invention, cocamidomethylmonoethanolamine is a nonionic surfactant, and its compounding amount in the shampoo is preferably 1 to 5% by mass.
Examples of commercially available products include Aminone C-11S (manufactured by Kao Corporation).

Further, it is preferable to further mix a cationic polymer as a texture-improving agent, a polyol as a moisturizer, an organic acid as a pH adjusting agent, and EDTA as a chelating agent in the dye-treated hair shampoo according to the present invention.

As the cationic polymer, cationized cellulose ether (polyquaternium-10), guar hydroxypropyltrimonium chloride, dimethyldiallylammonium chloride/acrylamide copolymer (polyquaternium-7) and the like are preferably used, and as a commercial product, Catinal PC-100. , Katinal CG-100S (all manufactured by Toho Chemical Industry Co., Ltd.), Merquat 2200 (Lubrizol Co.) and the like.

Further, examples of the polyol include glycerin, sorbitol, dipropylene glycol, 1,3-butylene glycol and the like.

The dye-treated hair shampoo according to the present invention can be produced by a conventional method, in addition to the above-mentioned components, within a range that does not impair the effects of the present invention, by incorporating other components usually used in cosmetics and pharmaceuticals.

Other components include, for example, oil components, powder components, moisturizers, natural polymers, synthetic polymers, thickeners, ultraviolet absorbers, sequestering agents, pH adjusters, skin nutrition agents, vitamins, antioxidants. , Antioxidant aids, fragrances, water and the like.

Particularly preferable additive components are lysine Na dilauroylglutamate, a damage repairing agent such as polyquaternium-61, a luster improving agent such as a pearl protein extract, a hair quality improving agent such as a hydrophobic protein and white sole larval collagen, soybean seed extract, perilla Female hormone-like drug such as extract, hop extract, white hair preventive such as salmon extract, hair extract such as sakura extract, chamomile extract, yokuinin extract, blood circulation promoter such as carrot extract, sea bream extract, dipotassium glycyrrhizinate Anti-inflammatory agents and the like.

The dye-treated hair shampoo according to the present invention contains an acylmethylalanine salt, imidazolinium betaine, and cocamidomethylmonoethanolamine as a cleaning component, and therefore maintains sufficient detergency and suppresses fading of the dye-treated hair. can do.

Hereinafter, preferred embodiments of the present invention will be described.

First, the evaluation test method adopted in this embodiment will be described.

[Discoloration evaluation method]
White hair dyed (human hair) is washed 28 times with a 10% shampoo aqueous solution (assuming actual use) 28 times (assuming 1 month), and the color of the hair strands before and after the hair washing treatment is measured with a color difference meter. did.
ΔE1 = (measured value before washing hair)-(measured value before gray hair (before dyeing))
ΔE2 = (measured value before washing hair)-(measured value after washing hair)
Color residual rate (%)=(1-ΔE2/ΔE1)×100
Therefore, the larger the color residual rate (%) is, the more "the effect of preventing color fading is evaluated."

[Detergency evaluation method]
This test method is an evaluation of the effect of degreasing power of the liquid detergent on the condition that the effects of foaming and friction are excluded.
Artificial leather is coated with artificial sebum, put in a sample (liquid cleaning material), vibration-washed with a touch mixer under constant conditions (2,500 rpm, 1 minute), rinsed lightly with water and dried.
The artificial leather before and after washing is measured with a color difference meter, and the sebum washing rate is calculated from the change in the measured value.
Sebum cleaning rate (%) = [1-(measured value of washed sample)/(measured value of untreated sample)] x 100
Therefore, the larger the sebum cleansing rate (%), the higher the cleanability is evaluated.

[Cytotoxicity evaluation method]
This test method is a cytotoxicity-based test method using SIRC cells (rabbit corneal epithelial cells), which is essentially an alternative to the eye irritation test, but is used as a safety evaluation method.
Using a 96-well plate, the cells adjusted to a predetermined concentration are seeded, and a sample adjusted to 10 steps of concentration is added.
After culturing, the dead cells are washed, and then live cells are stained by crystal violet staining.
The absorbance at 595 nm of crystal violet is measured by a microplate reader.
When the cell viability in the control medium containing no sample was set to 100%,
The concentration at which the absorbance becomes half (half lethal concentration, LC50: Lethal Concentration 50) is calculated and compared.
Therefore, the larger the LC50 is, the higher the safety is evaluated.

[Selection of surfactant]
The present inventors investigated the residual color ratio of the various surfactants shown in Table 1 below at an effective content of 1.8% in consideration of the actual concentration of the shampoo used.
The results are shown below.

As is clear from Table 1, each of the surfactants alone contained anionic surfactant Na laureth sulfate, Lauroylmethylalanine Na, an amphoteric surfactant imidazolinium betaine, and a nonionic surfactant. It is understood that some PEG-2 laurate has a high color retention.

[Combination of surfactants]
Next, the present inventors proceeded with the investigation on the interaction of various surfactants.
That is, the surfactant content was fixed at 20% by mass, various properties were examined by combining an anionic surfactant, an amphoteric surfactant, and a nonionic surfactant.
The results are shown in Table 2.

As is clear from Table 2, the detergency and the residual color ratio vary depending on the combination of the surfactants, and based on the combination of lauroylmethylalanine Na and imidazolinium betaine, the one with a larger amount of lauroylmethylalanine Na is the color. It is understood that both the residual rate and the detergency tend to be high. As for the nonionic surfactant, PEG-2 laurate alone has a better color-remaining effect than cocamidomethyl MEA. It is understood that the color retention effect is superior.

[Effect of adding nonionic surfactant]
Next, the present inventors examined the effect of adding a nonionic surfactant. Nonionic surfactants are not suitable for use as the main ingredient of shampoos because they do not have high detergency and they have a poor feeling of use such as foaming properties.
However, as shown in Table 3 below, it was confirmed that the nonionic surfactant has a function of reducing the irritancy of the anionic surfactant and the amphoteric surfactant.

In particular, cocamide MEA (LC50=0.009) tends to have a slightly higher cytotoxicity than PEG-2 laurate (LC50=0.017) when the surfactant alone is used, but it is not compatible with anionic surfactants and amphoteric surfactants. The combination has a large reduction rate of cytotoxicity, and together with the above-mentioned color residual effect, it can be said to be a suitable nonionic surfactant.

As described above, it is understood that lauroylmethylalanine salt and imidazolinium betaine are preferably selected from the viewpoints of color residual ratio and detergency, and that addition of cocamidomethyl MEA also reduces irritation.

[Influence of other ingredients]
From the results of Tables 1 and 2 above, the present inventors based on the combination of laurolylmethylalanine Na, imidazolinium betaine, and cocamidomethyl MEA, further improving the feel, moisturizer, and effect when adjusting the pH. Was examined.
The results are shown in Table 4.

As is clear from Table 4, the addition of the cationic polymer not only improves the feeling in use, but also markedly improves the color fading suppression effect. Further, the pH is optimally in the range of 6.0±0.5.

Claims (5)

7 to 12 mass% of acylmethylalanine salt,
Imidazolinium betaine 7 to 12% by mass,
1-5% by mass of cocamidomethyl monoethanolamine,
A shampoo for dyeing-treated hair, which comprises: The shampoo according to claim 1, further comprising a cationic polymer in an amount of 0.2 to 1.0% by mass, which is a shampoo for dyed hair. The shampoo according to claim 1 or 2, wherein the shampoo has a pH of 6.0 ± 0.5. The shampoo according to any one of claims 1 to 3, wherein the surfactant other than the three types of the acylmethylalanine salt, imidazolinium betaine, and cocamidomethylmonoethanolamine is 5% by mass or less in the composition. Shampoo for dyed hair. The shampoo according to claim 4, which is substantially free of alkyl ether sulfate, acylmethyl taurine salt, and acyl glutamate, and is a shampoo for dyed hair.