Powdered cleansing composition for external use

Abstract

To provide a powdered cleansing composition for external use that exhibits excellent ability to remove makeup cosmetics, while ensuring excellent foaming properties and foam persistence, smooth skin feel after washing, and long-term stability.SOLUTION: A powdered cleansing composition for external use comprises the following components (A) and (B): (A) 10-50 mass% of an amino acid-based surfactant, and (B) 3-50 mass% of a mono fatty acid glycerin ester having an acyl group with 12-14 carbon atoms and a linear structure.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a powdered cleansing composition for external use, and more specifically to a powdered cleansing composition for external use that has excellent cleansing power for removing makeup cosmetics, and is also excellent in foaming, foam retention, smoothness of the skin after cleansing, and stability over time. [Background technology]

[0002] It is known that the accumulation of oily residues such as sebum, skin dirt, and makeup products on the skin can lead to skin damage, including rough skin, making it extremely important to cleanse the skin and remove makeup. Cleansers based primarily on amino acid surfactants are particularly popular as safe cleansing ingredients, as they are relatively gentle on the skin. Furthermore, their elastic foam cleanses without causing friction, making them less harsh on the skin.

[0003] On the other hand, formulations based on foaming anionic surfactants tend to have low affinity with cosmetics containing a large amount of oil, such as makeup cosmetics, due to the large amount of water present when foaming and used, and therefore tend to have low cleansing power. Furthermore, in recent years, the staying power of makeup cosmetics has improved, and there has been an increase in makeup cosmetics that cannot be completely removed with foam-type facial cleansers.

[0004] As the staying power of makeup cosmetics has improved, cleansing cosmetics that can be used without foaming and contain many oily ingredients that blend well with makeup cosmetics have been proposed. For example, cleansing cosmetics that are primarily made of oily bases, such as cleansing creams, cleansing oils, and cleansing gels, are in use. However, these cleansing cosmetics contain a lot of oil, and even after rinsing, the oil remains on the skin, resulting in a lack of a refreshing feeling. Therefore, after use, it is necessary to wash the face with a foaming cleanser (double cleansing), which is cumbersome to use and places a strain on the skin. For these reasons, there is still a need for technology that improves the cleansing power of foam-type cleansing formulations that do not require double cleansing.

[0005] A technique for blending a polyglycerol fatty acid ester and an ionic surfactant has been disclosed as a method for improving the cleansing power of a foaming facial cleanser (Patent Document 1). However, blending a lipophilic component to achieve higher cleansing power impairs foaming, reduces foam retention, and causes poor conditions such as separation and precipitation, so there are limitations on the amount of lipophilic component that can be blended.

[0006] The applicant has previously proposed a cleansing composition that has excellent cleansing power for removing makeup cosmetics containing esters of fatty acids and polyethylene glycols and esters of fatty acids and polyhydric alcohols in their formulations, and that also has high foaming and foam retention properties (Patent Document 2).

[0007] The inventors have investigated the incorporation of high levels of oily ingredients into foam-type and cream-type topical cleansing agents in order to further improve cleansing power, but found it difficult to incorporate high levels of oily ingredients into formulations containing a large amount of water. On the other hand, powdered topical cleansing agents contain almost no water, allowing for stable incorporation of lipophilic ingredients, but lipophilic ingredients have the problem of inhibiting foaming and foam retention during use. Therefore, it was necessary to select ingredients that have high cleansing power but do not inhibit foaming and foam retention. Regarding powdered topical cleansing agents, there are disclosures such as a technology that combines an acyl glutamate and a higher fatty acid salt with an amino acid or the like (Patent Document 3) and a technology that combines an acyl amino acid salt and a higher fatty acid salt with a cationic polymer and a nonionic surfactant (Patent Document 4). However, both proposals focus on foam quality and foaming, and there are no disclosures that address improving the cleansing power of powdered topical cleansing agents.

[0008] Given these circumstances, conventional technologies have not been able to achieve a powdery external cleansing composition that has high cleansing power while also having excellent foaming, foam retention, skin smoothness after cleansing, and stability over time, and there has been an urgent need to solve these problems. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent Publication No. 2021-155387 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-193838 [Patent Document 3] Japanese Patent Application Laid-Open No. 2009-196971 [Patent Document 4] Patent Publication No. 2021-161059 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide a powdery external cleansing composition that has excellent cleansing power for removing makeup cosmetics, and is also excellent in foaming, foam retention, smoothness of the skin after cleansing, and stability over time. [Means for solving the problem]

[0011] In order to achieve the above object, the present inventors have conducted extensive research and have found that (A) Amino acid surfactant 10 to 50% by mass (B) 3 to 50% by mass of mono-fatty acid glycerin ester having an acyl group with 12 to 14 carbon atoms and being linear The present invention has been completed based on the discovery that the above problems can be solved by blending the above ingredients.

[0012] The first invention is a composition comprising: (A) 10 to 50 mass% of an amino acid-based surfactant; (B) 3-50% mono-fatty acid glycerin ester having 12-14 carbon atoms in the acyl group and being linear The powdered external cleansing composition contains:

[0013] The second invention is a powdered external cleansing agent composition according to the first invention, characterized in that the component (A) is at least one selected from the group consisting of N-acylglycine salts, N-acylglutamic acid salts, and N-acylmethyltaurine salts.

[0014] A third invention is the powdered external cleansing composition according to the first or second invention, which contains the component (A) and the component (B) in a mass ratio of 1:2 to 5:1. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a powdery external cleansing composition that has excellent cleansing power for removing makeup cosmetics, and also has good foaming properties, good foam retention, smooth skin after cleansing, and excellent stability over time. BEST MODE FOR CARRYING OUT THE INVENTION

[0016] The present invention will be described in more detail below. Unless otherwise noted, when the amount of a component is expressed as "%", it means % by mass.

[0017] The powdered external cleansing composition of the present invention is a powdered external cleansing composition that is used by foaming with water. The powder in the present invention refers to an aggregate of minute solids, including granular particles. There are no particular restrictions on the particle size, but the powder is defined as a particle having a particle size of 2000 μm or less, as measured by an optical microscope.

[0018] The powdered external cleansing composition of the present invention is substantially free of water. In the present invention, "substantially free of water" means that the powdered external cleansing composition contains no more than 2% by mass of water based on the total amount of the composition.

[0019] The amino acid surfactant (A) mainly imparts foaming to the powdery cleansing composition, dissolves the component (B) described below, and provides excellent cleansing ability. The amino acid surfactant (A) may be any surfactant commonly used in external preparations.

[0020] The amino acid surfactant (A) used in the present invention is not particularly limited, but is preferably a powder containing 10% or less water. The amino acid surfactant (A) can be selected appropriately depending on the purpose.

[0021] Specific examples of (A) amino acid surfactants include potassium N-cocoyl glycine, sodium N-lauroyl glycine, sodium N-lauroyl-L-glutamate, triethanolamine N-cocoyl glutamate, sodium N-myristoyl-N-carboxyethyl glycine, sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-lauroyl-aspartate, sodium N-cocoyl threonine, potassium N-cocoyl-L-glutamate, sodium N-stearoyl-L-glutamate, potassium N-lauroyl-N-methyl-β-alanine, and sodium N-lauroyl-N-methyl-β-alanine. Examples of such cleansing agents include N-oleyl-N-methyl-β-alanine triethanolamine, N-cocoyl-DL-alanine triethanolamine, N-cocoyl-β-alanine triethanolamine, N-cocoyl-sarcosine-triethanolamine, sodium N-cocoyl-methyl taurate, potassium N-cocoyl-methyl taurate, sodium N-oleyl-methyl taurate, sodium N-caproyl-methyl taurate, sodium N-lauroyl-methyl taurate, sodium N-myristoyl-methyl taurate, sodium N-palmitoyl-methyl taurate, sodium N-cocoyl-taurate, sodium N-lauroyl-taurate, etc. Among these, potassium N-cocoyl-glycine, sodium N-lauroyl-L-glutamate, and sodium N-cocoyl-methyl taurate are preferred because of their excellent foaming and cleansing properties.

[0022] Examples of commercially available products of component (A) include Amirite (registered trademark) GCK-11 (potassium N-cocoylglycine), Amirite (registered trademark) GCS-11 (sodium N-cocoylglycine), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-lauroyl-L-glutamate), Amisoft (registered trademark) MS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) HS-11P (sodium N-stearoyl-L-glutamate), Amisoft (registered trademark) HS-11P(F) (sodium N-stearoyl-L-glutamate) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), and Diapon (registered trademark) K-SF (sodium N-cocoyl-methyl taurate, manufactured by NOF Corporation).

[0023] The amount of component (A) to be blended is 10 to 50% by mass, more preferably 20 to 40% by mass, based on the total amount of the powdery external cleansing composition. Within this range, excellent foaming is achieved, and the effect of component (B), which will be described later, also ensures excellent makeup removal.

[0024] In the present invention, the component (A) may be used alone or in combination of two or more types.

[0025] Component (B) used in the present invention is a monoester of fatty acid and glycerin, a mono-fatty acid glycerin ester in which the acyl group has 12 to 14 carbon atoms and is linear. It is blended primarily for the purpose of improving cleansing power without impairing foaming, and also improves foam retention.

[0026] The blending amount of component (B) is 5 to 50% by mass, preferably 10 to 35% by mass, based on the total amount of the powdery external cleansing composition. This blending amount does not impair foaming, improves cleansing power and foam retention, and does not impair the smoothness of the skin after cleansing.

[0027] Examples of commercially available mono-fatty acid glycerin esters include MONOMULS (registered trademark) 90-L12 (glyceryl monolaurate, manufactured by BASF Japan Ltd.) and NIKKOL (registered trademark) MGM (glyceryl monomyristate, manufactured by Nikko Chemicals Co., Ltd.).

[0028] In the present invention, the component (B) may be used alone or in combination of two or more.

[0029] In the present invention, the blending ratio of component (A) to component (B) is not particularly limited, but is preferably 1:2 to 5:1. At this blending ratio, a powdery external cleansing composition with particularly good foaming and excellent cleansing power can be obtained.

[0030] In addition to the essential components described above, the composition of the present invention can also contain, as needed, ingredients commonly used in topical preparations. For example, pearlescent agents, moisturizers, thickeners, water-soluble polymers, fragrances, disinfectants, preservatives, antioxidants, UV absorbers, anti-inflammatory agents, antioxidants, cooling agents, enzymes, herbal extracts, and vitamins can be added as appropriate. When these ingredients are added, the blending ratio can be selected appropriately depending on the type and purpose. One ingredient can be used alone, or two or more ingredients can be used in appropriate combination.

[0031] The cleansing composition for external use of the present invention is in powder form and can be used for washing the face, head, and body. For example, it can be used as a cleansing agent for external use such as a facial cleansing powder, powdered shampoo, or powdered body soap, and may be in the form of granules. Among these, a facial cleansing powder is preferred. [Example]

[0032] The present invention will be further described below with reference to examples, but these examples are not intended to limit the present invention in any way.

[0033] Powdered external cleansing compositions were prepared for Examples 1 to 7 and Comparative Examples 1 to 11 by blending the components in the mass ratios shown in Table 1. All raw materials were ground and mixed using a Wonder Crusher WC-3 (Osaka Chemical Co., Ltd.). The components used are as follows: Potassium myristate (NOF Corporation "NonSal (registered trademark) MK-1") Cocoyl glycine potassium (Amirite (registered trademark) GCK-11, manufactured by Ajinomoto Co., Inc.) Sodium lauroyl glutamate (Amisoft (registered trademark) LS-11, manufactured by Ajinomoto Healthy Supply Co., Ltd.) Glyceryl monolaurate (MONOMULS® 90-L12, manufactured by BASF Japan Ltd.) Glyceryl monoisostearate (NIKKOL (registered trademark) MGIS manufactured by Nikko Chemicals Co., Ltd.) Talc (MicroAce (registered trademark) P-3 manufactured by Nippon Talc Co., Ltd.) Glyceryl tristearate (National Mimatsu "Esteride GS")

[0034] The prepared cleansing compositions were evaluated according to the following five criteria: cleansing power, foaming, foam retention after blending with makeup, skin smoothness after cleansing, and formulation stability. The evaluation results are shown in Table 1. [Cleansing power] 1: A 4cm diameter circle was marked on the skin, and 0.02g of colored W / O base makeup (Ridi Liquid Foundation, Naris Cosmetics) was applied evenly to the circle using a fingertip with a finger cot on. 2: Let dry for 60 minutes. 3: Prepare a 10% aqueous solution of the prepared external cleansing composition, lather it thoroughly, then take 0.2 g of the foam, place it in the circle, and rub the area back and forth with your fingers 50 times. 4: Rinse with water and visually check to see how much makeup has been removed. 5: Sensory evaluation was conducted by 10 expert panelists, and the makeup removal performance was evaluated based on the following criteria. The average score of the 10 panelists was calculated, with less than 3.0 points being marked x, 3.0 to 3.5 points being marked △, 3.5 to 4.5 points being marked ○, and 4.5 points or more being marked ◎.

[0035] 5 points: very good 4 points: Fairly good 3 points: Normal 2 points: Somewhat bad 1 point: Bad

[0036] [Foaming] 0.1 g of the prepared external cleansing composition was weighed into an IWAKI screw-top test tube (TST-SCR16-125, a test tube with an outer diameter of 16 mm and a length of 125 mm), and a separately sold cap (No. 415-15) was fastened. 3 mL of purified water was added, and the test tube was shaken up and down 10 times, and the height of the foam immediately afterwards was measured. The evaluation criteria were as follows:

[0037] ◎:10.0cm or more ○: 7.0cm or more and less than 10.0cm △: 4.0cm or more and less than 7.0cm ×: Less than 4.0cm

[0038] [Awamochi] 0.3 g of the powdered cleansing topical composition of each Example and Comparative Example and 0.01 g of a W / O base makeup (Ridi Liquid Foundation, Naris Cosmetics) were weighed into an IWAKI screw-top test tube (TST-SCR16-125, a test tube with an outer diameter of 16 mm and a length of 125 mm), and a separately sold cap (No. 415-15) was fastened. 3 mL of purified water was added, and the test tube was shaken up and down 10 times. The foam height immediately after and after leaving it to stand for 3 minutes was measured. The evaluation criteria were as follows:

[0039] ◎: Foam after 3 minutes is 70% or more of the foam immediately after use ○: Foaming after 3 minutes is 50% to 70% of the foaming immediately after △: Foaming after 3 minutes is 30% to less than 50% of the foaming immediately after ×: Foaming after 3 minutes is less than 30% of the foaming immediately after

[0040] [Smoothness of skin after cleansing] A panel of 10 experts diluted the powdered cleansing compositions of Examples and Comparative Examples 10 times with purified water, then used a facial cleansing foamer (product name: Funwari Rich, imported by Mitsuki Co., Ltd.) to create foam by moving it up and down 100 times, washed their faces with 10 g of foam, and evaluated the smoothness of the skin after towel drying by sensory evaluation. The evaluation criteria were as follows:

[0041] ◎: Excellent - Seven or more subjects answered that their skin felt smooth after washing. 〇: Good The number of subjects who answered that their skin was smooth after washing was 5 or 6. △: Slightly bad The number of subjects who answered that their skin felt smooth after washing was 3 or 4. ×: Poor The number of subjects who answered that their skin felt smooth after washing was 2 or less.

[0042] [Stability of formulation] The powdered external cleansing compositions of the Examples and Comparative Examples were left to stand in an incubator whose temperature alternated between 0°C and 45°C every day. The condition was evaluated by visual inspection after leaving the compositions to stand for 5 hours in an environment of 20°C. The evaluation criteria were as follows:

[0043] 〇: Good condition: No change after 30 days, can be used normally ×: Bad After 30 days, the condition has changed and it cannot be used normally.

[0044] [Table 1]

[0045] [Table 2]

[0046] Powdered cleansing topical compositions containing the components of the present invention achieved significantly better results than comparative examples in terms of makeup cleansing power, foaming, foam retention when blended with makeup, skin smoothness after cleansing, and formulation stability. Examples (1) to (7), which are powdered cleansing topical compositions containing specific amounts of (A) and (B), achieved the objectives of the present invention. In particular, Examples 1 to 4 and Examples 6 to 7, in which the mass ratio of component (A) to component (B) was in the range of 1:2 to 5:1, exhibited good foaming and cleansing ability. Comparative Example 1 uses a higher fatty acid salt instead of component (A). It can be seen that Comparative Example 1 exhibits worse makeup cleansing power and skin smoothness after cleansing than Example 1. Comparing Example 1 with Comparative Examples 2 and 3, when the amount of component (A) was outside the specified range, the foaming results were poor in Comparative Example 2 and the skin smoothness after cleansing in Comparative Example 3. Looking at Example 1 and Comparative Examples 4 to 7, the objective could not be achieved in any of the following cases: when component (B) was not included, when it was replaced with a similar component, or when the amount included was outside the specified range. These results demonstrate that component (B) is essential to the present invention's configuration for cleansing makeup and resolving the issues of foam retention when blended with makeup. Comparative Examples 8 and 9 simulate a pump-type cleansing agent in which talc was replaced with water. Comparative Example 8 exhibited precipitation of glyceryl laurate over time, resulting in a loss of stability compared to Example 1. Meanwhile, when the amount of glyceryl laurate in Comparative Example 9 was reduced to a level that did not impair stability compared to Comparative Example 8, the cleansing power was insufficient. Comparative Examples 10 and 11, which used branched fatty acids or triglycerides, resulted in a paste-like consistency, lacking stability and resulting in poor foam retention. Comparative Example 11, in particular, also exhibited poor foaming. These results demonstrate that the specific ranges of components (A) and (B) are essential to the present invention's configuration.

[0047] The following are formulation examples of the powdered external cleansing composition of the present invention. These were prepared by grinding and mixing the raw materials using a Wonder Crusher WC-3 (Osaka Chemical Co., Ltd.). It has been confirmed that these formulation examples solve all of the problems of the present invention.

[0048] [Prescription Example 1] Facial cleansing powder Ingredients Amount (%) Cocoyl glutamate potassium 30 Sodium Stearoyl Glutamate 5 Glyceryl Laurate 15 Glyceryl Myristate 5 Soapwort Leaf Extract 0.008 Water 0.496 1,3-butylene glycol 0.496 Protease 0.05 Lipase 0.05 Chelating agent (appropriate amount) pH adjuster (appropriate amount) Preservative (appropriate amount) Talc Residue Total 100

[0049] [Formulation example 2] Powder shampoo Ingredients Amount (%) Cocoyl glycine potassium 25 Sodium Methyl Cocoyl Taurate 25 Glyceryl Myristate 10 Tremella fuciformis polysaccharide 3 Protease 0.05 Lipase 0.05 Chelating agent (appropriate amount) pH adjuster (appropriate amount) Preservative (appropriate amount) (Vinyl Dimethicone / Methicone Silsesquioxane) Crosspolymer (Powder) Residue Total 100

[0050] [Prescription Example 3] Powdered body soap Ingredients Amount (%) Sodium Lauroyl Glutamate 40 Glyceryl Laurate 25 Chelating agent (appropriate amount) pH adjuster (appropriate amount) Preservative (appropriate amount) PEG-9M 1 Protease 0.05 Lipase 0.05 Sericite residue Total 100

Claims

1. (A) Amino acid surfactant 10 to 50% by mass (B) 3 to 50% by mass of a mono-fatty acid glycerin ester having an acyl group with 12 to 14 carbon atoms and being linear A powdered external cleansing composition comprising:

2. 2. The powdered external cleansing composition according to claim 1, wherein the component (A) is at least one selected from the group consisting of N-acylglycine salts, N-acylglutamic acid salts, and N-acylmethyltaurine salts.

3. 3. The powdered external cleansing composition according to claim 1, wherein the mass ratio of component (A) to component (B) is 1:2 to 5:1.

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