Hair cleansing agent composition and method for improving the appearance stability of the hair cleansing agent composition

Abstract

To provide a hair cleansing agent composition that offers excellent smoothness during shampooing and superior appearance stability that suppresses discoloration over time, and a method for improving the appearance stability of a hair cleansing agent composition. [Solution] The hair cleansing composition of the present invention contains (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites. In addition, the amount of component (A) in the hair cleansing composition of the present invention may be 0.01 to 25.0% by mass of the total hair cleansing composition, and the amount of component (B) may be 0.001 to 1.0% by mass of the total hair cleansing composition.

Description

Technical Field

[0001] The present invention relates to a hair cleansing composition and a method for improving the appearance stability of a hair cleansing composition.

Background Art

[0002] In recent years, shampoo formulations containing an amino acid-based surfactant, such as an acyl amino acid-based anionic surfactant, as a cleansing component, are gradually becoming the mainstream, replacing shampoos containing polyoxyethylene alkyl ether sulfate as a cleansing component. Shampoo formulations containing amino acid-based surfactants have mild detergency and high conditioning properties, and are characterized by the fact that the hair is less likely to become entangled during hair washing and rinsing. In addition, with the recent boom in non-silicone shampoos, when silicone is not blended, shampoo formulations based on amino acid-based surfactants are increasingly demanded by the market.

[0003] Furthermore, non-silicone amino acid-based shampoo formulations are increasingly required to have high design quality, including the container, in order to provide higher added value to users in the market. When enhancing the design quality, there is a tendency to increase the transparency of the container itself, and it is required that the appearance of the shampoo formulation be clearer. However, in the case of shampoo formulations containing an amino acid-based surfactant as a cleansing component, the shampoo formulation itself tends to become colored over time. In particular, yellowing, in which the formulation color changes to yellow, and browning, in which it changes to brown, are often observed. Therefore, it is required that the appearance of the shampoo formulation changes little and the appearance of the formulation is more constant.

[0004] On the other hand, there are known cleansing compositions that use laureth carboxylate, a different component from amino acid-based surfactants, as the main cleansing agent. These cleansing compositions using laureth carboxylate as the main cleansing agent are known to yellow over time, and to suppress this yellowing, for example, Patent Document 1 discloses a combination of laureth carboxylate and a nonionic surfactant. However, shampoo formulations using amino acid-based surfactants as cleansing ingredients undergo significant discoloration due to the presence of amino groups in the amino acid-based surfactants, resulting in discoloration behavior that differs greatly from other cleansing ingredients. Therefore, it is desirable to suppress yellowing and browning over time in shampoo formulations using amino acid-based surfactants as cleansing ingredients. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-029389 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The present invention has been made in view of the above circumstances, and aims to provide a hair cleansing agent composition that is excellent in terms of smoothness when washing hair and has excellent appearance stability that suppresses discoloration of the appearance over time, and a method for improving the appearance stability of a hair cleansing agent composition. [Means for solving the problem]

[0007] The present inventors have found that by including (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from sulfites, pyrosulfites, nitrites, and pyrosulfites, it is possible to provide a hair cleansing composition that offers excellent smoothness during hair washing and excellent appearance stability by suppressing discoloration over time, thus completing the present invention.

[0008] In other words, the hair cleansing composition of the present invention comprises (A) an acyl amino acid-based anionic surfactant and (B) contains one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites.

[0009] Furthermore, the hair cleansing composition of the present invention may contain 0.01 to 25.0% by mass of component (A) relative to the entire hair cleansing composition, and 0.001 to 1.0% by mass of component (B) relative to the entire hair cleansing composition.

[0010] Furthermore, the hair cleansing composition of the present invention may contain (C) a cationic polymer, with the amount of component (C) being 0.01 to 5.0% by mass of the entire hair cleansing composition, and the pH being 5.0 to 6.5.

[0011] The present invention provides a method for improving the appearance stability of a hair cleansing composition, which involves including in the hair cleansing composition (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites. [Effects of the Invention]

[0012] The present invention provides a hair cleansing agent composition that offers excellent smoothness during hair washing and superior appearance stability that suppresses discoloration over time, as well as a method for improving the appearance stability of a hair cleansing agent composition. [Modes for carrying out the invention]

[0013] The following describes embodiments of the hair cleansing agent composition and the method for improving the appearance stability of the hair cleansing agent composition according to the present invention, but the present invention is not limited to the following embodiments. The present invention is not limited to each of the configurations described below, and various modifications are possible within the scope of the claims, and embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. In addition, unless otherwise specified in this specification, "A~B" representing a numerical range means "A or more, B or less". In addition, unless otherwise specified in this specification, "A%" representing a ratio means "A by mass%".

[0014] In this specification, "having appearance stability" means that the appearance of the hair cleansing composition does not change color (yellowing or browning) over time.

[0015] <Hair cleansing agent composition> The hair cleansing composition according to this embodiment contains (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites.

[0016] <(A) Acyl amino acid-based anionic surfactants> Component (A) contained in the hair cleansing composition according to this embodiment is an acyl amino acid-based anionic surfactant. The acyl amino acid-based anionic surfactant is added to the hair cleansing composition according to this embodiment to provide smoothness during hair washing. The acyl amino acid-based anionic surfactant, which is component (A), is not particularly limited, but examples include lauroyl sarcosinate TEA, lauroyl sarcosinate sodium, cocoyl glutamate TEA, cocoyl glutamate sodium, cocoyl glutamate disodium, lauroyl methylalanine sodium, lauroyl hydroxyethyl β-alanine sodium, cocoyl threonine sodium, cocoyl methyl taurate sodium, lauroyl aspartate sodium, lauroyl aspartate TEA, cocoyl methyl taurate sodium, etc. From the viewpoint of improving smoothness during hair washing, lauroyl sarcosinate TEA, cocoyl glutamate TEA, lauroyl methylalanine sodium, and cocoyl methyl taurate sodium are used as acyl amino acid-based anionic surfactants. This is preferable. In the hair cleansing composition according to this embodiment, the acyl amino acid-based anionic surfactant, which is component (A), may be used alone or in combination of two or more types.

[0017] In the hair cleansing composition according to this embodiment, the amount of component (A) is not particularly limited as long as it provides smoothness to the hair during washing, but it is preferably 0.01 to 25% by mass of the entire hair cleansing composition. If the amount of component (A) is 0.01% by mass or more and 25% by mass or less, sufficient smoothness to the hair during washing can be achieved.

[0018] <(B) One or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites> The hair cleansing composition according to this embodiment contains component (B), which is one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites. In the hair cleansing composition according to this embodiment, component (B) is used as an antioxidant. As described above, the hair cleansing composition according to this embodiment contains an acyl amino acid-based anionic surfactant as component (A). Because acyl amino acid-based anionic surfactants contain an amino group in their structure, hair cleansing compositions containing acyl amino acid-based anionic surfactants may yellow or brown in appearance. However, the hair cleansing composition according to this embodiment contains component (B) in addition to component (A), which makes it possible to suppress discoloration (yellowing and browning) of the appearance when the hair cleansing composition is stored. The sulfites, pyrosulfites, nitrites, and pyrosulfites that are component (B) are not particularly limited, but these salts may be sodium, potassium, lithium, and ammonium salts. (B) Sodium pyrosulfite and sodium pyronitrate are preferred as component (B) from the viewpoint of improving appearance stability over time, and sodium pyrosulfite is more preferred. Furthermore, from the viewpoint of further improving the appearance stability of the hair cleansing composition, component (B) may be used alone or in combination of two or more types.

[0019] In the hair cleansing composition according to this embodiment, the amount of component (B) is not particularly limited as long as the appearance of the hair cleansing composition is stable, but it is preferably 0.001 to 1.0% by mass, and more preferably 0.005 to 0.1% by mass, relative to the entire hair cleansing composition. If the amount of component (B) is 0.001% by mass or more, yellowing and browning of the hair cleansing composition over time can be sufficiently suppressed. On the other hand, if the amount of component (B) is 1.0% by mass or less, precipitates in the hair cleansing composition can be sufficiently suppressed.

[0020] The hair cleansing composition according to this embodiment contains (A) an acyl amino acid-based anionic surfactant and (B) at least one selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyronitrites. By containing these components, the ease of combing during hair washing can be improved, and changes in appearance due to coloring caused by yellowing and browning resulting from the acyl amino acid-based anionic surfactant can be suppressed.

[0021] Further, the hair cleansing composition according to this embodiment may optionally contain (C) a cationic polymer in addition to the components (A) and (B).

[0022] <(C) Cationic polymer> The hair cleansing composition according to this embodiment may contain a cationic polymer as the component (C). In the hair cleansing composition according to this embodiment, by containing the cationic polymer as the component (C), the ease of combing during hair washing can be further improved. The cationic polymer is not particularly limited. For example, polyquaternium-6, polyquaternium-7, polyquaternium-10, polyquaternium-11, polyquaternium-22, polyquaternium-28, polyquaternium-47, polyquaternium -48, polyquaternium-49, polyquaternium-52, polyquaternium-53, polyquaternium-55, polyquaternium-107, guar hydroxypropyltrimonium chloride, cassia hydroxypropyltrimonium chloride, Caesalpinia spinosa hydroxypropyltrimonium chloride, etc. can be mentioned. From the viewpoint of improving the ease of combing during hair washing, polyquaternium-7, polyquaternium-10, polyquaternium-22, polyquaternium-28, polyquaternium-47, polyquaternium-48, polyquaternium-49, polyquaternium-107, and guar hydroxypropyltrimonium chloride are preferable as the cationic polymer.

[0023] When the hair cleansing composition according to this embodiment contains the component (C), the blending amount is not particularly limited, but is preferably 0.01 to 5.0% by mass, and more preferably 0.1 to 3.0% by mass or less. If the blending amount of the component (C) is 0.01% by mass or more, the ease of combing during hair washing can be further improved, and if it is 5.0% by mass or less, precipitation can be sufficiently suppressed.

[0024] <Other components> In addition to the above components, the hair cleansing composition according to this embodiment can optionally use any components commonly used in cosmetics as long as the effects of the present invention are not impaired. These components include anionic surfactants other than acyl amino acid-based anionic surfactants, amphoteric surfactants, cationic surfactants, nonionic surfactants, oils, ultraviolet absorbers, preservatives, humectants, polymers other than cationic polymers, amino acid derivatives, sugar derivatives, water, alcohols, thickeners, colorants, sequestering agents, antioxidants, drugs, fragrances, and the like.

[0025] Also, the hair cleansing composition according to this embodiment contains an acyl amino acid-based anionic surfactant as the component (A) as described above. Therefore, since the hair cleansing composition according to this embodiment has mild detergency and high conditioning properties, it may be a hair cleansing composition that does not contain silicone, although not limited thereto.

[0026] <ph> The hair cleansing composition according to this embodiment preferably has a pH of 5.0 to 6.5 at 30°C. If the pH of the hair cleansing composition is in the range of 5.0 to 6.5, the thickening performance will not decrease drastically over time, and it can be used without spilling from the hands. Furthermore, as will be described later, the appearance of the hair cleansing composition according to this embodiment is not limited to transparent or opaque. If the appearance of the hair cleansing composition is opaque, the composition contains an opacifying agent, but if the pH at 30°C is 5.0 to 6.5, the opacifying agent can be stably maintained.

[0027] The pH of a hair cleansing agent composition is generally adjusted by adding an organic acid component to the composition. Examples of organic acids used for pH adjustment include glutamic acid, lactic acid, salicylic acid, and citric acid, with citric acid being preferred.

[0028] Conventional methods can be used to measure pH. For example, a hair cleansing agent composition prepared by a standard method can be left to stand at 30±2°C for two days to maintain a constant temperature of the formulation. Then, the pH can be measured. Alternatively, a known pH measuring device can be used for pH measurement, such as a glass electrode pH meter.

[0029] <Viscosity> The hair cleansing agent composition according to this embodiment may be a viscous liquid, and its viscosity at 30°C is preferably 100 to 5000 mPa·s, and more preferably 100 to 5000 mPa·s. Note that the viscosity at 30°C as used herein refers to the hair cleansing agent composition. This refers to the viscosity measured after the mixture has been left to stand at 30±2℃ for two days. Known measuring instruments can be used for viscosity measurement, such as a Brookfield viscometer. If the viscosity of the hair cleansing agent composition at 30℃ is in the range of 100 mPa·s to 5000 mPa·s, the viscosity of the hair cleansing agent composition itself will not be too high, it will mix well with water, and it will have a good feel when used, such as good lathering.

[0030] The hair cleansing composition according to this embodiment can suppress discoloration caused by yellowing and browning over time due to acyl amino acid-based anionic surfactants. Furthermore, the suppression of discoloration does not depend on the appearance of the hair cleansing composition. Therefore, there are no particular limitations on the appearance of the hair cleansing composition according to this embodiment, and examples include an opaque appearance such as a transparent appearance, a cloudy appearance as if a suspending agent is included, and a pearlescent appearance as if a pearlescent agent is included. From the viewpoint of more effective suppression of discoloration, the hair cleansing composition according to this embodiment preferably has a transparent appearance. In addition, the dosage form of the hair cleansing composition according to this embodiment is arbitrary and can be a viscous liquid or a gel. Examples of formulations to which the hair cleansing composition according to this embodiment can be applied include shampoo compositions, skin cleansing compositions, and facial cleansers.

[0031] <Method for improving the appearance stability of hair cleansing agent compositions> The method for improving the appearance stability of a hair cleansing agent composition according to this embodiment (hereinafter sometimes simply referred to as the "method for improving appearance stability") involves including in the hair cleansing agent composition (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites.

[0032] The method for improving appearance stability according to this embodiment involves including the above-described component (A) and component (B) in a hair cleansing composition. The amounts of component (A) and component (B) to be included in the hair cleansing composition are not particularly limited, but from the viewpoint of further improving appearance stability, it is preferable that component (A) be 0.01 to 25.0% by mass and component (B) be 0.001 to 1.0% by mass of the entire hair cleansing composition.

[0033] The method for improving appearance stability according to this embodiment involves adding (A) an acyl amino acid-based anionic surfactant and (B) one or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites to the hair cleansing agent composition, thereby improving the appearance stability of the hair cleansing agent composition and suppressing discoloration due to yellowing and browning of the hair cleansing agent composition. [Examples]

[0034] The hair cleansing agent composition and appearance stabilization method according to this embodiment will be specifically described below with reference to examples, but the scope of the present invention is not limited by these examples. Prior to the examples, the test methods and evaluation methods used in each example and comparative example will be described. The hair cleansing agent composition was prepared by a standard method and evaluated as follows.

[0035] (1) Evaluation of discoloration The mixture was poured into a transparent glass bottle (approximately 4 cm wide, 10 cm high, and 3 cm deep) and left at 60°C for 15 days. Subsequently, the appearance of the room-temperature stored sample of Comparative Example 2 and the heated samples of each example and comparative example (hair cleansing agent compositions left at 60°C for 15 days) were evaluated.

[0036] The evaluation was performed visually. For Comparative Example 2, samples showing discoloration between the room-temperature stored and heated hair cleansing agent compositions were marked with △, samples with less discoloration were marked with ○, samples with even less discoloration were marked with ◎, and samples with more discoloration were marked with ×.

[0037] (2) Evaluation of the feel of the shampoo composition Ten male and female subjects washed their hair using the hair cleansing compositions of Examples 1-24 and Comparative Examples 1-4, and the reduction in hair stiffness during washing was evaluated. The scores were classified as follows, and the average value was calculated.

[0038] <Evaluation of hair manageability during shampooing> The reduction in squeaking is very high, and it feels smooth to the touch... 4 points Slightly better at reducing creaking, and slightly better at smooth finger movement. ·· 3 points The reduction in squeaking is somewhat low, and the smoothness of the fingers glides through the hair slightly poor. (2 points) The reduction in squeaking is minimal, and the texture is poor. ······ 1 point

[0039] Furthermore, the evaluation criteria were set as follows: ◎ ··· Average score of 3.0 or higher ○ ··· Average score is between 2.5 and 3.0 △ ··· Average score is between 2.0 and 2.5 × ··· Average score is less than 2.0

[0040] (3) Evaluation of precipitation Hair cleansing compositions that were left standing at 30±2℃ for 2 days were marked with × if precipitation was observed, and with ○ if no precipitation was observed.

[0041] (4) pH measurement The pH values ​​of the hair cleansing agent composition, which had been left standing at 30±2℃ for two days, were measured using a glass electrode pH meter (LAQUA F-72, manufactured by HORIBA).

[0042] (5) Measurement of viscosity The viscosity of the hair cleansing agent composition, which had been left to stand at 30±2°C for 2 days, was measured using a Brookfield viscometer (LVDV1M, manufactured by Brookfield).

[0043] Examples 1-24, Comparative Examples 1-4 Hair cleansing compositions according to the formulations shown in Tables 1-3 were prepared according to conventional methods, and the aforementioned tests were conducted and evaluated. The results are also shown.

[0044] [Table 1]

[0045] [Table 2]

[0046] [Table 3]

[0047] As is clear from Tables 1-3, the compositions of Examples 1-24 all showed superior performance compared to the compositions of Comparative Examples 1-4.

[0048] The following are other formulation examples of the hair cleansing composition of the present invention. These formulation examples were also examined for the above-mentioned evaluations of discoloration, smoothness during washing, and precipitation, and all formulation examples exhibited excellent properties and were deemed satisfactory.

[0049] Example Formulation 1: Shampoo (by mass) (1) Lauroyl sarcosine TEA 4.0 (2) Cocoyl glutamate TEA 3.0 (3) Sodium Cocoyl Methyl Taurate 7.0 (4) Palm kernel fatty acid amidopropyl betaine 5.0 (5) PEG-2 laurate 1.5 (6) Cocamide MEA 1.3 (7) Sodium Chloride 1.1 (8) Polyquaternium-10 0.1 (9) Myristic acid 0.1 (10) Ceteareth-60 myristyl glycol 1.0 (11) Polyquaternium-49 0.1 (12) Guar hydroxypropyltrimonium chloride 0.3 (13) Polyquaternium-7 0.1 (14) BG 0.1 (15) PEG-7 glyceryl coconut oil fatty acid 1.0 (16) Sunflower seed oil 0.1 (17) Saccharomyces / Sunflower Sprout Ferment Extract 0.1 (18) Sunflower seed extract 0.1 (19) Sunflower flower extract 0.1 (20) Sodium pyrosulfite 0.01 (21) Citric acid 0.4 (22)Fragrance 1.0 (23) EDTA-2Na 0.2 (24) Sodium benzoate 0.5 (25) Water residual difference Viscosity (30℃): 3000mPa·s, pH (30℃): 5.3, Specific gravity: 1.06

[0050] Formulation Example 2: Shampoo (by mass) (1) Lauroyl sarcosine TEA 6.0 (2) Sodium lauroyl methylalanine 2.0 (3) Lauramidopropyl betaine 2.0 (4) Cocamidopropyl betaine 2.0 (5) PEG-2 laurate 0.2 (6) Glycol distearate 1.0 (7) Polyquaternium-10 0.2 (8) Polyquaternium-22 0.1 (9) BG 0.1 (10) Rice bran extract 0.1 (11) Sapindus mukorossi extract 0.1 (12) Dianthus superbus seed extract 0.1 (13) Belamcanda chinensis extract 0.1 (14) Camellia seed extract 0.1 (15) Glycosyltrehalose 0.1 (16) Sake lees extract 0.1 (17) Callicarpa japonica fruit extract 0.1 (18) Camellia seed oil 0.1 (19) Caramel 0.01 (20) Citric acid 0.2 (21)Fragrance 1.0 (22) Rice germ oil 1.0 (23) Sodium chloride 0.8 (24) Rice bran oil 0.1 (25) Sodium pyrosulfite 0.1 (26) EDTA-2Na 0.2 (27) Sodium benzoate 0.5 (28) Water residual Viscosity (30℃): 2000mPa·s, pH (30℃): 5.4, Specific gravity: 1.11

[0051] Formula Example 3: Shampoo (by mass) (1) Sodium lauroyl methylalanine 5.0 (2) Sodium lauroyl hydroxyethyl β-alanine 5.0 (3) Palm kernel fatty acid amidopropyl betaine 4.0 (4) Lauramide MIPA 0.5 (5) PEG-2 laurate 1.5 (6) Glycol distearate 1.0 (7) Polyquaternium-10 0.2 (8) Polyquaternium-49 0.1 (9) BG 0.1 (10) Dipotassium glycyrrhizate 0.1 (11) Lactoferrin 0.1 (12) PEG-7 glyceryl coconut oil fatty acid 1.1 (13) Sodium chloride 0.1 (14) Citric acid 0.6 (15) Sodium cocoamphoacetate 0.3 (16) Shea butter 0.1 (17) Lactobacillus / milk fermentation liquid 0.1 (18) Sodium pyronite 0.05 (19)Fragrance 1.0 (20) EDTA-2Na 0.2 (21) Sodium benzoate 0.5 (22) Water residual Viscosity (30℃): 2000mPa・s, pH (30℃): 5.6, Specific gravity: 1.18

[0052] The hair cleansing composition of the present invention is extremely useful as a hair cleansing composition that exhibits minimal discoloration over time and excellent smoothness when the hair is washed.< / ph>

Claims

1. (A) Acyl amino acid-based anionic surfactants, (B) One or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites, A hair cleansing composition containing [the specified ingredient].

2. (A) The amount of component included is 0.01 to 25.0% by mass of the entire hair cleansing composition. The hair cleansing composition according to claim 1, wherein the amount of component (B) is 0.001 to 1.0% by mass of the entire hair cleansing composition.

3. (C) Contains a cationic polymer, The amount of component (C) is 0.01 to 5.0% by mass of the entire hair cleansing composition. A hair cleansing composition according to claim 1 or 2, wherein the pH is 5.0 to 6.

5.

4. In hair cleansing composition (A) Acyl amino acid-based anionic surfactants, (B) One or more selected from the group consisting of sulfites, pyrosulfites, nitrites, and pyrosulfites, A method for improving the appearance stability of a hair cleansing agent composition, comprising the inclusion of [a specific substance].

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