JP7643012B2 - Hair cleansing composition - Google Patents

Description

The present invention relates to a hair cleansing composition, and in particular to a hair cleansing composition that can be suitably applied to dyed hair that has been dyed.

Hair cleansing compositions such as shampoos have been improved in various ways to wash away dirt from the hair and scalp and to create a comfortable hair and scalp environment. With regard to the feel when using the product, improvements have been made to improve the foam volume and elasticity of the foam so that the hair feels comfortable even while washing.

On the other hand, the habit of dyeing hair has spread to people of all ages and genders, and various types of hair dyes have been launched on the market, including permanent hair dyes such as hair color that use oxidative dyes; semi-permanent hair dyes such as hair manicures, color shampoos, and color treatments that use acidic or basic dyes; and temporary hair dyes such as color sprays that temporarily color hair using pigments.
One of the requirements for such hair dyes is that the color of the hair that has been dyed, i.e., that the color of the hair that has been dyed, lasts long (suppression of fading).

For the purpose of suppressing fading, for example, a color shampoo composition proposed in Patent Document 1 may be used.
However, this color shampoo composition contains a dye and is applied as the hair is washed to dye it. Although it is effective in preventing fading, the dye may not be the same color as the original hair color, or the original hair color may not be maintained.

In response to this, hair wash compositions that make the dyed color itself less likely to fade have also been proposed. For example, Patent Document 2 discloses a hair wash containing an amphoteric surfactant and a chelating agent, and Patent Document 3 discloses a hair wash containing an amphoteric surfactant, an anionic amino acid surfactant, an anionic surfactant other than amino acid surfactants, a cationic polymer compound, and a chelating agent, in which the ratio of the amphoteric surfactant is greater than that of each anionic surfactant.
However, although these hair washes are excellent in preventing fading, they contain more amphoteric surfactants than anionic surfactants, and therefore may not produce enough foam volume or foam elasticity to provide a good washing sensation when washing hair.

Furthermore, Patent Document 4 discloses a hair cleanser composition containing a specific amphoteric surfactant (amidopropyl betaine type) and a specific anionic surfactant (acylmethyl taurine salt).
However, although the composition is excellent in preventing discoloration and has an excellent foam volume when an anionic surfactant is blended in excess of an amphoteric surfactant, the foam elasticity may be insufficient.
Therefore, there is a demand for a hair wash composition that, when applied to dyed hair, is excellent in inhibiting fading and also has excellent foam volume and foam elasticity, thereby providing a good washing feel during hair washing.

JP 2019-218295 A JP 2017-19739 A JP 2017-19740 A JP 2002-275038 A

Therefore, the problem that the present invention aims to solve is to provide a hair cleansing composition that is excellent in preventing fading of dyed hair and can produce a large amount of foam with high elasticity that provides a good washing sensation.

Means for Solving the Problems The present inventors conducted intensive research to solve the above problems, and as a result, discovered that by combining a specific anionic surfactant, another anionic surfactant, and an amphoteric surfactant in a specific mass ratio, it is possible to obtain a detergent composition which is excellent in inhibiting discoloration of dyed hair that has been dyed, and which also has excellent foam volume and foam elasticity and provides a good washing feel, thereby completing the present invention.
That is, the present invention is as follows.

Component (A): 1 to 20% by mass of a surfactant represented by the following formula (1),
Component (B): 0.1 to 10% by mass of one or more anionic surfactants (excluding sodium lauroyl methyl taurine) selected from the group consisting of polyoxyethylene alkyl ether sulfates, N-acyl methyl taurine salts, and N-acyl amino acid salts other than component (A) ,
Component (C): 1 to 20% by mass of one or more amphoteric surfactants selected from the group consisting of lauryl betaine, coconut oil fatty acid amidopropyl betaine, palm kernel oil fatty acid amidopropyl betaine, lauryl hydroxysulfobetaine, and sodium cocoamphoacetate.
wherein the mass ratios of component (A), component (B) and component (C) are 4.0≧ (A)/(B) ≧2.0 and 2.1≧ {(A)+(B)}/(C)≧1.0.

（式（１）中、Ｒ^１ＣＯは炭素数８～２２の脂肪族アシル基を示し、Ｒ²は単結合または炭素数１～４の直鎖もしくは分岐鎖のアルキレン基を示し、Ｒ³は炭素数１～４の直鎖または分岐鎖のアルキレン基を示し、Ｍはアルカリ金属、１／２アルカリ土類金属、有機アンモニウム、またはアミノ酸塩を示す。）

(In formula (1), R ¹ CO represents an aliphatic acyl group having 8 to 22 carbon atoms, R ² represents a single bond or a linear or branched alkylene group having 1 to 4 carbon atoms, R ³ represents a linear or branched alkylene group having 1 to 4 carbon atoms, and M represents an alkali metal, a 1/2 alkaline earth metal, an organic ammonium, or an amino acid salt.)

The hair cleansing composition of the present invention (hereinafter, also simply referred to as the "cleaning composition"), when used in particular when cleaning dyed hair, is effective in preventing discoloration and also produces a large amount of foam with high elasticity, providing a pleasant washing sensation.

Hereinafter, an embodiment of the present invention will be described.
In this specification, the numerical ranges defined using the symbol "to" are intended to include both the upper and lower limits of the symbol "to". For example, "2 to 5" means 2 or more and 5 or less.

The cleaning composition of the present invention contains at least components (A), (B), and (C). Each component is described below.

[Component (A)]
Component (A) is a surfactant represented by the following formula (1).

R ¹ CO in formula (1) represents an aliphatic acyl group having 8 to 22 carbon atoms, preferably 8 to 18 carbon atoms. The aliphatic acyl group includes not only acyl groups derived from saturated or unsaturated fatty acids having 8 to 22 carbon atoms, but also acyl groups derived from mixed fatty acids containing two or more of these fatty acids. Examples include coconut oil fatty acid acyl groups, palm kernel oil fatty acid acyl groups, capryloyl groups, caproyl groups, lauroyl groups, myristoyl groups, palmitoyl groups, stearoyl groups, oleoyl groups, and behenyl groups. Among these, preferred are lauroyl groups, myristoyl groups, coconut oil fatty acid acyl groups, and palm kernel oil fatty acid acyl groups, and more preferred are lauroyl groups, coconut oil fatty acid acyl groups, and palm kernel oil fatty acid acyl groups.

R ² in formula (1) represents a single bond or a linear or branched alkylene group having 1 to 4 carbon atoms. Examples of the linear or branched alkylene group having 1 to 4 carbon atoms include a methylene group, an ethylene group, an n-propylene group, an isopropylene group, an n-butylene group, and an isobutylene group, and preferably an ethylene group or an n-propylene group. That is, examples of R ² OH in formula (1) include a hydroxy group, a monohydroxyethyl group, a monohydroxypropyl group, a monohydroxyisopropyl group, a monohydroxybutyl group, and a 2-hydroxybutyl group, and preferably a monohydroxyethyl group or a monohydroxypropyl group.

R ³ in formula (1) represents a linear or branched alkylene group having 1 to 4 carbon atoms. Examples of R ³ include a methylene group, an ethylene group, an n-propylene group, an isopropylene group, an n-butylene group, an isobutylene group, and the like, and preferably an ethylene group or an n-propylene group. That is, examples of R ³ COO in formula (1) include a monocarboxymethylene group, a monocarboxyethylene group, a monocarboxypropylene group, a monocarboxyisopropylene group, a monocarboxybutylene group, a monocarboxyisobutylene group, and the like, and preferably a monocarboxyethylene group or a monocarboxypropyl group.

In formula (1), M represents an alkali metal, a 1/2 alkaline earth metal, an organic ammonium or an amino acid salt.
Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include magnesium and calcium. Examples of the organic ammonium include monoethanol ammonium, diethanol ammonium, and triethanol ammonium.
Furthermore, the amino acid salt is a salt formed by an amino acid and an alkali metal, an amino acid and a 1/2 alkaline earth metal, or an amino acid and an organic amine, and acts as a counter ion of the acyl amino acid. Examples of amino acids that form amino acid salts include valine, leucine, isoleucine, histidine, lysine, methionine, phenylalanine, threonine, tryptophan, asparagine, aspartic acid, alanine, arginine, cysteine, glutamine, glutamic acid, glycine, proline, serine, tyrosine, N-methylglycine, N-methyl-β-alanine, N-(2-hydroxyethyl)-β-alanine, taurine, and methyltaurine. Examples of alkali metals and alkaline earth metals that form amino acid salts include those exemplified above. Examples of organic amines that form amino acid salts include monoethanolamine, diethanolamine, and triethanolamine. In the present invention, the term "organic ammonium" does not conceptually include amino acid ammonium formed by an amino acid and an organic amine.
M is preferably sodium, potassium, triethanolammonium, sodium taurine, potassium taurine, or triethanolamine taurine, and more preferably sodium, triethanolammonium, sodium taurine, or triethanolamine taurine.

Specific examples of the surfactant represented by formula (1) include N-lauroyl-N-hydroxyethyl-β-alanine sodium, N-lauroyl-N-hydroxyethyl-β-alanine triethanolamine, N-lauroyl-N-hydroxypropyl-β-alanine triethanolamine, and N-coconut oil fatty acid acyl-N-hydroxyethyl-β-alanine sodium.
As the component (A), one type selected from the surfactants represented by the above formula (1) can be used alone, or two or more types can be used in combination.

The content of component (A) in the cleaning composition of the present invention is 1 to 20% by mass, preferably 5 to 15% by mass, and more preferably 5 to 10% by mass, based on the total amount of the composition. If the content of component (A) is too low, the fading inhibition, foam volume, and foam elasticity may be poor, and if the content of component (A) is too high, the fading inhibition may be poor.

[Component (B)]
Component (B) is an anionic surfactant other than component (A).
Examples of such anionic surfactants include alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkylamide ether sulfates, polyoxyethylene alkylamide ether sulfates, polyoxyethylene alkyl ether acetates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, α-olefin sulfonates, higher fatty acid salts, N-acyl amino acid salts other than component (A), N-acyl isethionates, N-acyl methyl taurines, N-acyl polypeptide salts, alkyl sulfosuccinates, etc. Among these, N-acyl methyl taurines and N-acyl amino acid salts other than component (A) are preferred, and N-acyl methyl taurines are more preferred.
From the viewpoint of foam volume and foam elasticity, the number of carbon atoms in the alkyl or acyl group of these anionic surfactants is preferably 8 to 18. The alkyl or acyl group may be derived from any of saturated fatty acids, unsaturated fatty acids, and mixed fatty acids which are mixtures of these. Examples of mixed fatty acids include coconut oil fatty acids and palm kernel oil fatty acids.
Examples of the counter ion of these anionic surfactants include alkali metals, 1/2 alkaline earth metals, organic ammonium, and amino acid salts, and specific examples thereof include those described for M of the component (A).

Specific examples of the anionic surfactant of component (B) include, for example, sodium POE (3) lauryl ether sulfate, sodium N-coconut oil fatty acid acyl-N-methyl taurate, sodium N-coconut oil fatty acid acyl-N-methyl taurate taurate, sodium N-lauroyl-N-methyl-β-alanine, and sodium N-coconut oil fatty acid acyl glutamate.
As component (B), one type selected from the above anionic surfactants can be used alone, or two or more types can be used in combination.

The content of component (B) in the cleaning composition of the present invention is 0.1 to 10% by mass, preferably 2 to 10% by mass, and more preferably 3 to 7% by mass, based on the total amount of the composition. If the content of component (B) is too low, the foam volume and foam elasticity may be poor, and if the content of component (B) is too high, the fading inhibition may be poor.

[Component (C)]
Component (C) is an amphoteric surfactant, which is a surfactant having a structure having an N-acyl group or an N-alkyl group, a cationic group, and an anionic group in combination. Examples of such surfactants include alkyl betaines, alkyl amido betaines, alkyl hydroxy sulfobetaines, alkyl amido hydroxy sulfobetaines, alkyl carboxymethyl hydroxyethyl imidazolinium betaines, alkyl amido hydroxyethyl amino acid type amphoteric surfactants, and alkyl imino diacetates.

The N-acyl group contained in the amphoteric surfactant is, for example, a straight-chain or branched-chain fatty acid residue having 8 to 18 carbon atoms. Examples of the fatty acid of the fatty acid residue include saturated fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid; unsaturated fatty acids such as palmitoleic acid, oleic acid, elaidic acid, linoleic acid, and linolenic acid; and mixtures thereof such as coconut oil fatty acid, palm kernel oil fatty acid, beef tallow fatty acid, and hardened beef tallow fatty acid. Among these, preferred are lauric acid, myristic acid, palmitic acid, oleic acid, coconut oil fatty acid, and palm kernel oil fatty acid, and more preferred are lauric acid, coconut oil fatty acid, and palm kernel oil fatty acid.

The alkyl group contained in the above amphoteric surfactant is, for example, a hydrocarbon group having 8 to 18 carbon atoms, and also includes mixed alkyl groups derived from mixed fatty acids. Examples include alkyl groups such as caprylyl, capryl, lauryl, myristyl, palmityl, stearyl, and oleyl; and mixed alkyl groups such as coconut oil alkyl groups, palm kernel oil alkyl groups, and beef tallow alkyl groups. Among these, preferred are lauryl, myristyl, palmityl, coconut oil alkyl groups, and palm kernel oil alkyl groups, and more preferred are lauryl, coconut oil alkyl groups, and palm kernel oil alkyl groups.

Specific examples of the amphoteric surfactant of component (C) include lauryl betaine, coconut oil fatty acid amidopropyl betaine, palm kernel oil fatty acid amidopropyl betaine, lauryl hydroxysulfobetaine, and sodium cocoamphoacetate.
As component (C), one type selected from the above amphoteric surfactants can be used alone, or two or more types can be used in combination.

The content of component (C) in the cleaning composition of the present invention is 1 to 20% by mass, preferably 5 to 15% by mass, and more preferably 5 to 10% by mass, based on the total amount of the composition. If the content of component (C) is too low, the effect of inhibiting fading may be poor, and if the content of component (C) is too high, the foam volume and foam elasticity may be poor.

[Quantitative relationship of each component]
The mass ratio of component (A) to component (B) in the cleaning composition of the present invention [(A)/(B)] is (A)/(B)>1.0, preferably (A)/(B)≧1.5, and more preferably (A)/(B)≧2.0. If the mass ratio [(A)/(B)] is 1.0 or less, the foam elasticity and the inhibition of fading may be inferior.
The upper limit of the mass ratio [(A)/(B)] is usually 4.0≧(A)/(B), preferably 3.5≧(A)/(B), and more preferably 3.0≧(A)/(B).

In addition, the mass ratio of the total of components (A) and (B) to component (C) in the cleaning composition of the present invention, [{(A)+(B)}/(C)], is {(A)+(B)}/(C) ≥ 1.0, preferably {(A)+(B)}/(C) ≥ 1.2. If the mass ratio [{(A)+(B)}/(C)] is less than 1.0, the foam volume and foam elasticity may be poor.
The upper limit of the mass ratio [{(A)+(B)}/(C)] is usually 4.0≧{(A)+(B)}/(C), preferably 3.0≧{(A)+(B)}/(C), and more preferably 2.0≧{(A)+(B)}/(C).

[Other ingredients]
The cleaning composition of the present invention usually contains water in addition to the above components (A) to (C). Examples of water include purified water, tap water, and deionized water.
The content of water in the cleaning composition of the present invention is usually 50 to 97 mass %, preferably 60 to 95 mass %, more preferably 70 to 90 mass %, and particularly preferably 75 to 85 mass %, based on the total amount of the composition.

The cleaning composition of the present invention may contain other optional components within the range not impairing the effects of the present invention.
Other optional components include, for example, oils and fats such as vegetable oils and animal oils; hydrocarbon oils such as squalane, liquid paraffin, and hydrogenated polyisobutene; higher alcohols such as cetyl alcohol, stearyl alcohol, and cetostearyl alcohol; silicones such as cyclic silicone, dimethylpolysiloxane, and amino-modified polysiloxane; ester oils such as 2-ethylhexyl palmitate, tri(caprylic acid/capric acid)glyceryl, and isopropyl myristate; and cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, and cocoyl arginine ethyl PCA. nonionic surfactants such as polyoxyethylene alkyl ethers, polyglycerol fatty acid esters, and polyoxyethylene glycerol fatty acid esters; water-soluble polymers such as hydroxyethyl cellulose, cationized cellulose, polyquaternium-10, polyethylene glycol, polyvinyl alcohol, and carboxyvinyl polymers; solvents such as ethanol, propylene glycol, and glycerin; pH adjusters such as citrates, succinates, malates, and tartrates; antioxidants such as tocopherol; polysaccharides, amino acids, peptides, preservatives, fragrances, and colorants may be appropriately contained.

The content of other optional components is usually 0 to 20% by mass, preferably 0.1 to 15% by mass, and more preferably 1 to 10% by mass, of the total amount of the composition.

The pH of the cleaning composition of the present invention is not particularly limited, but the value at 25° C. in the undiluted form without dilution with water is preferably 4.5 to 8.0, more preferably 5.0 to 7.5, and particularly preferably 5.5 to 7.0.
The pH can be measured using a pH meter in accordance with JIS Z8802.

The following examples and comparative examples will be used to further explain the present invention.

[Examples 1 to 8 and Comparative Examples 1 to 5]
<Preparation of cleaning composition>
Components (A) to (C) in Tables 1 and 2 and other components were added sequentially to water, mixed, and dissolved uniformly to prepare hair wash compositions of Examples 1 to 8 and Comparative Examples 1 to 5. The pH of the resulting hair wash compositions was measured using a pH meter in accordance with JIS Z8802, and the results are shown in Tables 1 and 2.
Commercially available products provided for use in cosmetics were used as the components in Tables 1 and 2. The content of each component in Tables 1 and 2 is shown in mass %. Note that Polyquaternium-10 shown in Tables 1 to 4 is a quaternary ammonium salt type cationic surfactant.
For each of the cleaning compositions of Examples 1 to 8 and Comparative Examples 1 to 5, the foam volume, foam elasticity, and discoloration inhibition were evaluated as described in the following (1) to (3). The evaluation results are shown in Tables 1 and 2.

<Evaluation of cleaning composition>
(1) Foam Volume 10 mL of each of the cleaning compositions of the Examples and Comparative Examples was taken and diluted with purified water to a total volume of 50 mL, and the composition was foamed for 5 seconds using a blender ("IFM-100" manufactured by Iwatani Corporation) and allowed to stand for 1 minute. The height of the foam in the blender container was then measured. Based on the measured foam height, the foam volume of the cleaning composition was evaluated into four levels of "◎", "◯", "△", and "×" according to the following evaluation criteria. The cleaning composition was evaluated as passing when it was evaluated as "◎" or "◯".
<Evaluation criteria>
◎: Foam height is 60 mm or more. ○: Foam height is 50 mm or more and less than 60 mm. △: Foam height is 40 mm or more and less than 50 mm. ×: Foam height is less than 40 mm.

(2) Foam Elasticity 20 mL of each of the cleaning compositions of the Examples and Comparative Examples was taken, diluted with purified water to a total volume of 100 mL, and placed in a 1,000 mL graduated cylinder without foaming. Next, a diffuser stone (Sudo Co., Ltd.'s "Bubble Mate, Starpet S105-D") was attached to a goldfish pump (Nihon Dobutsu Yakuhin Co., Ltd.'s "Air Pump, Nichido Non-Noise S200"), the diffuser stone was immersed in the dilution solution, and foam was generated to 1,000 mL at a flow rate of 1,000 mL/min. A float (Umezu Co., Ltd.'s "Fluorescent Synthetic Ball Float No. 15, weight 10 g") with a weight (weight 5 g) was placed in the foam, and the time it took for the center line of the float to pass from 1,000 mL to 500 mL was measured. Based on the measured time, the foam elasticity of the cleaning composition was evaluated in four stages, "◎", "○", "△", and "×", according to the following evaluation criteria. The cases where the evaluation was "A" or "B" were judged to be acceptable.
<Evaluation criteria>
◎: Passing time is 15 seconds or more. ○: Passing time is 10 seconds or more but less than 15 seconds. △: Passing time is 5 seconds or more but less than 10 seconds. ×: Passing time is less than 5 seconds.

(3) Suppression of fading A commercially available oxidative hair dye ("Men's Bigen, Mousse Color, Natural Black" manufactured by Hoyu Corporation) was applied to a bundle of 100% yak hair (manufactured by Bealux Co., Ltd.) weighing 1 g, and the hair was left for 30 minutes, after which it was rinsed with warm water at 40°C, towel-dried, and then dried with a hair dryer for dyeing.
50 mL of each of the cleaning compositions of the Examples and Comparative Examples was taken, and diluted with purified water to a total volume of 100 mL. A bundle of 1 g of yak hair that had been dyed as described above was immersed in the diluted solution and allowed to stand at 23° C. for 24 hours. After standing, the bundle was rinsed with warm water at 40° C., towel-dried, and then dried with a hair dryer. The L ^* value, a ^* value, and b ^* value of the bundle of hair before and after washing were measured using a spectrophotometer ("CM-2600d" manufactured by Konica Minolta, Inc.). From each of these values, the color difference ΔE was calculated according to the following formula. Based on the calculated color difference, the fading inhibition of the cleaning composition was evaluated in four stages, "◎", "○", "△", and "×", according to the following evaluation criteria. The cases where the evaluation was "◎" and "○" were deemed to be acceptable.
Color difference ΔE = [(ΔL ^* ) ² + (Δa ^* ) ² + (Δb ^* ) ² ] ^(1/2)
ΔL ^* , Δa ^* , Δb ^* : Difference between values before and after washing <Evaluation criteria>
◎: ΔE is less than 7.0 ○: ΔE is 7.0 or more and less than 8.0 △: ΔE is 8.0 or more and less than 9.0 ×: ΔE is 9.0 or more

The cleaning compositions of Examples 1 to 8 all exhibited good foam volume, foam elasticity, and anti-fading properties.
On the other hand, in Comparative Example 1, since component (A) was not contained, the foam volume, foam elasticity, and anti-fading properties were inferior.
In Comparative Example 2, since component (B) was not contained, the foam volume and foam elasticity were inferior.
In Comparative Example 3, since component (C) was not contained, the inhibition of fading was insufficient.
In Comparative Example 4, the mass ratio of component (A) to component (B) [(A)/(B)] was 1.0 or less, and therefore the inhibition of fading was insufficient.
In Comparative Example 5, the mass ratio of the sum of components (A) and (B) to component (C), {(A) + (B)} / (C)], was less than 1.0, and therefore the foam volume and foam elasticity were poor.

Furthermore, specific formulation examples of the hair cleansing composition of the present invention are shown below. In each formulation example, the total amount was adjusted to 100% by mass using water. In addition, the pH in each formulation example was 6.0.

The hair cleansing compositions of these formulation examples exhibited a high foam volume and foam elasticity, and also exhibited good anti-fading properties, demonstrating the effectiveness of the present invention.

INDUSTRIAL APPLICABILITY The hair wash composition of the present invention is excellent in inhibiting discoloration and is capable of producing a large amount of foam with high elasticity that provides a good washing sensation, and therefore can be suitably used as a wash composition for dyed hair that has been dyed.

Claims (1)

Component (A): 1 to 20% by mass of a surfactant represented by the following formula (1),
Component (B): 0.1 to 10% by mass of one or more anionic surfactants (excluding sodium lauroyl methyl taurine) selected from the group consisting of polyoxyethylene alkyl ether sulfates, N-acyl methyl taurine salts, and N-acyl amino acid salts other than component (A) ,
Component (C): 1 to 20% by mass of one or more amphoteric surfactants selected from the group consisting of lauryl betaine, coconut oil fatty acid amidopropyl betaine, palm kernel oil fatty acid amidopropyl betaine, lauryl hydroxysulfobetaine, and sodium cocoamphoacetate.
wherein the mass ratios of component (A), component (B) and component (C) are 4.0≧ (A)/(B) ≧2.0 and 2.1≧ {(A)+(B)}/(C)≧1.0.

(In formula (1), R ¹ CO represents an aliphatic acyl group having 8 to 22 carbon atoms, R ² represents a single bond or a linear or branched alkylene group having 1 to 4 carbon atoms, R ³ represents a linear or branched alkylene group having 1 to 4 carbon atoms, and M represents an alkali metal, a 1/2 alkaline earth metal, an organic ammonium, or an amino acid salt.)