Creamy, weakly acidic skin cleanser

Abstract

To provide creamy, weakly acidic skin cleansers that have excellent foaming and foam elasticity and give a moist finish.SOLUTION: The present invention pertains to a creamy, weakly acidic skin cleanser containing (A) cocoyl glycine potassium, (B) Palm fatty acid arginine, and (C) guar hydroxypropyltrimonium chloride, the content of component (A) being 20 to 40 wt.%, the content of component (B) being 1 to 7 wt.%, the content of component (C) being 0.01 to 0.5 wt.%, and the pH being 5.0 to 7.0.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a creamy, weakly acidic skin cleanser which has excellent foaming properties and foam elasticity and leaves skin feeling moisturized after washing. [Background technology]

[0002] Skin cleansing agents are used to remove excess sebum, waste products, and dirt and to keep the skin healthy, and in recent years, cream-type skin cleansing agents have been widely used due to their ease of use. In particular, from the viewpoint of excellent foaming and foam elasticity, the cream-type skin cleansing agents generally contain fatty acid soaps, such as potassium salts of higher fatty acids, as their main components.

[0003] However, cream-type skin cleansers that contain fatty acid soap as their main ingredient have a high cleansing power and wash away excess sebum, which can leave the skin feeling rough and tight after washing, and some consumers may even experience skin irritation.

[0004] In addition, since human skin is naturally slightly acidic, it is known that washing with alkaline fatty acid soaps puts a strain on the skin. For this reason, some consumers with sensitive skin prefer skin cleansers that do not contain fatty acid soaps as their main ingredient, in order to leave a gentle wash on the skin.

[0005] On the other hand, skin cleansers that do not have fatty acid soap as their main ingredient have problems with lathering and the foam is not elastic, meaning that no foam cushion is created between the hands and skin when washing, resulting in irritation due to friction.

[0006] To solve these problems, cream-type weakly acidic skin cleansers have been developed whose main ingredients are N-acylglycine salts (Patent Document 1) or acylglutamic acid-type or amidopropylbetaine-type amphoteric surfactants (Patent Document 2). However, there remains the problem that satisfactory results cannot be obtained in terms of moist feeling after washing or elasticity of foam. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent application 2018-25552 [Patent Document 2] Patent application 2010-35181 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a creamy, weakly acidic skin cleanser which has excellent foaming properties and foam elasticity and leaves the skin feeling moisturized after washing. [Means for solving the problem]

[0009] That is, the present invention provides: (A) Potassium cocoyl glycine (B) Coconut fatty acid arginine (C) Guar Hydroxypropyltrimonium Chloride The present invention provides a creamy, weakly acidic skin cleanser comprising the above-mentioned components, the content of component (A) being 20 to 40% by weight, the content of component (B) being 1 to 7% by weight, and the content of component (C) being 0.01 to 0.5% by weight, and the pH being 5.0 to 7.0. Effect of the Invention

[0010] The creamy, weakly acidic skin cleanser of the present invention is excellent in foaming and foam elasticity, and leaves the skin feeling moisturized after washing. BEST MODE FOR CARRYING OUT THEINVENTION

[0011] The content of potassium cocoyl glycinate (A) of the present invention is preferably 20 to 40% by weight. If the content of component (A) is less than 20% by weight, the cleanser will not solidify, and if the content exceeds 40% by weight, the cleanser will be too hard and may not become a creamy skin cleanser.

[0012] Examples of commercially available products of component (A) potassium cocoyl glycine include "Amirite GCK-11(F)" (manufactured by Ajinomoto Co., Inc.).

[0013] The content of coconut fatty acid arginine (B) of the present invention is preferably 1 to 7% by weight, more preferably 2 to 4% by weight. If the content of component (B) is less than 1% by weight, the foaming property may be insufficient. On the other hand, if the content is more than 7% by weight, the moist feeling of the skin after washing may be insufficient.

[0014] Examples of commercially available coconut fatty acid arginine as component (B) include "Aminosop AR-12" (manufactured by Ajinomoto Co., Ltd.).

[0015] The content of guar hydroxypropyltrimonium chloride (C) of the present invention is preferably 0.01-0.5% by weight, more preferably 0.1-0.3% by weight. If the content of C is less than 0.01% by weight, the foam may not have sufficient elasticity. On the other hand, if the content is more than 0.5% by weight, the foaming may not be sufficient.

[0016] Examples of commercially available products of component (C) guar hydroxypropyltrimonium chloride include "Labor Gum CG-M" (manufactured by DSP Gokyo Food & Chemical Co., Ltd.).

[0017] The pH in the present invention refers to the pH of a 1% by weight aqueous solution of the cream-type skin cleanser at 20°C. The cream-type skin cleanser is defined as a skin cleanser having a hardness of 3 to 90 g at 20°C. The hardness is measured using a rheometer RT-3002D (manufactured by Rheotec). 50 g of the skin cleanser is placed in a 50 ml test cream container (NFF-50) manufactured by Nichei Plastics Industries Co., Ltd., and a circular adapter with a diameter of 10 mm is inserted into the cream container at a speed of 20 mm / min to a width of 1 cm, and the maximum value during this period is defined as the hardness of the present invention. If the hardness is 3 to 90 g, the skin cleanser will not leak out of the container, will not be too hard when used by consumers, and will be easy to use.

[0018] Furthermore, the creamy, weakly acidic skin cleanser of the present invention can contain various water-soluble and oil-soluble ingredients as appropriate depending on the purpose of use, such as surfactants, moisturizers such as polyhydric alcohols, anti-inflammatory agents such as dipotassium glycyrrhizinate, fragrances, chelating agents, preservatives, colorants, water-soluble polymers, cosmetic ingredients, and other ingredients that are water-soluble or oil-soluble depending on the purpose, within the scope of the invention. EXAMPLES

[0019] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. All contents in the examples are in weight percent.

[0020] Creamy weak acid skin cleansing agents were prepared having the compositions shown in Tables 1 and 2 below. The pH of 1 wt % aqueous solutions of the Examples and Comparative Examples in the tables was measured at 20°C using a pH meter F-51 (manufactured by Horiba, Ltd.), and it was confirmed that the pH of all the examples was in the range of 5.0 to 7.0. Furthermore, when the hardness of the Examples and Comparative Examples in the tables kept at 20°C was measured using the above method, it was confirmed that the hardness of all the examples was 3 to 90 g.

[0021] A panel of 15 experts evaluated each cream-type mildly acidic skin cleanser in terms of "goodness of foaming," "foam elasticity," and "moisturizing feeling of skin after washing." (Preparation method) All the components were heated to 70 to 75°C, and after confirming that they were uniformly dissolved, they were cooled to 30°C. (Evaluation method) The "foaming ability" was evaluated by a specialist panel and rated according to the following criteria. ◎: 13 or more people rated it as having good foaming. ○: 10 to 12 people rated it as having good foaming. △: 6 to 9 people rated it as having good foaming. ×: Five or fewer people rated the foaming as good. The "foam elasticity" was evaluated by a specialist panel and rated according to the following criteria. ◎: 13 or more people rated the foam as bouncy. ○: 10 to 12 people rated the foam as elastic. △: 6 to 9 people rated the foam as bouncy. ×: Five or fewer people rated the foam as bouncy. The "moist feeling of skin after washing" was evaluated by a specialist panel and rated according to the following criteria. ◎: More than 13 people rated that their skin felt moisturized after washing. ○: 10 to 12 people rated that their skin felt moisturized after washing. △: 6 to 9 people rated that their skin felt moisturized after washing. ×: Five or fewer people evaluated that their skin felt moisturized after washing.

[0022] [Table 1] *1: Amirite GCK-11(F) (manufactured by Ajinomoto Co., Inc.) *2: SP Sysrol EGDS MBAL-PA-(SG) (manufactured by Croda Japan) *3: Behenyl Alcohol 65 (Kyushu Alcohol Kogyo Co., Ltd.) *4: Glycerin RG·Co·P (manufactured by NOF Corporation) *5: 1,3-butylene glycol (manufactured by Daicel Chemical Industries, Ltd.) *6: Citric acid monohydrate (manufactured by Yoneyama Pharmaceutical Co., Ltd.) *7: Labor Gum CG-M (manufactured by DSP Gokyo Food & Chemical Co., Ltd.) *8: Aminosoap AR-12 (manufactured by Ajinomoto Co., Ltd.) *9: Alhome K-100 (manufactured by New Japan Chemical Co., Ltd.) *10: Diapon K-SF (manufactured by NOF Corp.) *11: Aminosurfact ACDS-L (manufactured by Asahi Kasei Finechem Corporation) *12: Shinorin SP (manufactured by Shin-Nippon Rika Co., Ltd.)

[0023] From the results of Table 1, in Examples 1 to 5, which are the embodiment products of the present invention, all the items evaluated were excellent. On the other hand, as shown in Comparative Example 1, when the content of coconut fatty acid arginine is less than 1% by weight, no satisfactory results were obtained in terms of good foaming, and as shown in Comparative Example 2, when the content of coconut fatty acid arginine is more than 7% by weight, no satisfactory results were obtained in terms of moist feeling after washing. Also, as shown in Comparative Example 3, when coconut fatty acid potassium was contained instead of coconut fatty acid arginine, no satisfactory results were obtained in terms of moist feeling of skin after washing, and as shown in Comparative Example 4, when coconut fatty acid arginine was contained instead of sodium cocoyl methyl taurine, no satisfactory results were obtained in terms of good foaming. Also, as shown in Comparative Example 5, when coconut fatty acid arginine was contained instead of sodium cocoyl glutamate, no satisfactory results were obtained in terms of foam elasticity, and as shown in Comparative Example 6, when coconut fatty acid arginine was contained instead of sodium lauryl sulfate, no satisfactory results were obtained in terms of moist feeling of skin after washing.

[0024] [Table 2] *13: Catinal CLB-100 (manufactured by Toho Chemical Industry Co., Ltd.) *14: Leoguard GP (manufactured by Lion) *15: Echo Gum (manufactured by DSP Gokyo Food & Chemical Co., Ltd.)

[0025] From the results of Table 2, in Examples 6 to 9, which are the embodiment products of the present invention, all the items evaluated were excellent. On the other hand, as shown in Comparative Example 7, when the content of guar hydroxypropyltrimonium chloride is less than 0.01% by weight, no satisfactory results were obtained in terms of foam elasticity, and as shown in Comparative Example 8, when the content of guar hydroxypropyltrimonium chloride is more than 0.5% by weight, no satisfactory results were obtained in terms of foaming. Also, as shown in Comparative Example 9, when locust bean hydroxypropyltrimonium chloride was contained instead of guar hydroxypropyltrimonium chloride, no satisfactory results were obtained in terms of foaming, and as shown in Comparative Example 10, when polyquaternium-10 was contained instead of guar hydroxypropyltrimonium chloride, no satisfactory results were obtained in terms of foaming and foam elasticity. Also, as shown in Comparative Example 11, when xanthan gum was contained instead of guar hydroxypropyltrimonium chloride, no satisfactory results were obtained in terms of foam elasticity.

[0026] Below are examples of creamy, weakly acidic skin cleansers that have excellent foaming and foam elasticity and leave a moisturized wash. The pH of a 1% by weight aqueous solution of these skin cleansers at 20°C was in the range of 5.0 to 7.0, and the hardness was in the range of 3 to 90 g. Furthermore, all of them achieved satisfactory results in the same evaluations as above for "good foaming," "foam elasticity," and "moisturized skin after washing."

[0027] (Example 10: Cream-type weak acidic face wash) (Ingredients) (Weight%) 1. Potassium cocoyl glycine *1 25.0 2. Glycol stearate *16 1.5 3. Behenyl alcohol *3 4.0 4. Glycerin ※4 25.0 5.Purified water remainder 6. Citric acid *6 2.5 7. Guar Hydroxypropyltrimonium Chloride *7 0.1 8. Coconut fatty acid arginine aqueous solution *8 8.0 9. Diglycerin *17 5.0 10. Dipotassium glycyrrhizinate *18 0.1 11. Sodium tocopheryl phosphate *19 0.3 12. Polyglyceryl-10 Laurate*20 1.0 13. Plant extract (appropriate amount) 14.Fragrance (appropriate amount) (Preparation method) All the components were heated to 70 to 75°C, and after confirming that they were uniformly dissolved, they were cooled to 30°C. *16: Ayacol EGS-MV (manufactured by Seiwa Kasei Co., Ltd.) *17: Diglycerin 801 (manufactured by Sakamoto Pharmaceutical Co., Ltd.) *18: Dipotassium glycyrrhizinate (manufactured by Nippon Paper Industries Co., Ltd.) *19: Sodium tocopheryl phosphate (TPNa) (Showa Denko) *20: NIKKOL DECAGLYN 1-L (manufactured by Nikko Chemicals)

[0028] (Example 11: Creamy weak acidic facial cleanser) (Ingredients) (Weight%) 1. Potassium cocoyl glycine *1 30.0 2. Glycol distearate *2 1.5 3. Behenyl alcohol *3 3.0 4. Glycerin ※4 35.0 5.Purified water remainder 6. Citric acid *6 2.5 7. Guar Hydroxypropyltrimonium Chloride *7 0.15 8. Coconut fatty acid arginine aqueous solution *8 12.0 9. Polyoxyethylene (20) methyl glucoside *21 3.0 10. Glycosyltrehalose / hydrogenated starch hydrolysate mixture *22 1.0 11. Magnesium ascorbyl phosphate*23 0.3 12. Sucrose laurate *24 1.0 13. Ceramide NG *25 0.02 14. Plant extract (appropriate amount) 15.Fragrance (appropriate amount) (Preparation method) All the components were heated to 70 to 75°C, and after confirming that they were uniformly dissolved, they were cooled to 30°C. *21: GLUCAM(TM) E-20 HUMECTANT (manufactured by Lubrizol Japan) *22: Tornare (Hayashibara) *23: Ascorbic acid PM (Showa Denko) *24: Surf Hope SE COSME C-1216 (manufactured by Mitsubishi Chemical Foods Corporation) *25: CERAMIDE TIC-001 (Takasago International Corporation)

[0029] (Example 12: Cream-type weak acid cleanser for the body) (Ingredients) (Weight%) 1. Potassium cocoyl glycine *1 35.0 2. Glycol distearate *2 1.0 3. Behenyl alcohol *3 2.5 4. Glycerin ※4 30.0 5. PEG-6, PEG-32※26 2.0 6.Purified water remainder 7. Citric acid※6 2.5 8. Guar Hydroxypropyltrimonium Chloride *7 0.2 9. Coconut fatty acid arginine aqueous solution *8 10.0 10. Oryzanol *27 0.3 11. Polyquaternium-61BG glycerin solution *28 1.0 12. Surfactin Na*29 0.1 13. Sodium lauroyl methylalanine aqueous solution *30 4.0 14. Plant extract (appropriate amount) 15.Fragrance (appropriate amount) (Preparation method) All the components were heated to 70 to 75°C, and after confirming that they were uniformly dissolved, they were cooled to 30°C. *26: PEG#1500 (NOF Corporation) *27: Oryza Gamma-V (Oryza Oil & Fat Chemical Co., Ltd.) *28: Lipidure-NR (NOF Corporation) *29: Kaneka Surfactin (manufactured by Kaneka Corporation) *30: Alanon ALE (manufactured by Kawaken Fine Chemicals) [Industrial Applicability]

[0030] According to the present invention, a creamy skin cleanser that has excellent foaming properties and foam elasticity and leaves skin feeling moisturized after washing can be provided.

Claims

[Claim 1] The following components (A) to (C) (A) Potassium cocoyl glycine (B) Coconut fatty acid arginine (C) Guar hydroxypropyltrimonium chloride The creamy, weakly acidic skin cleanser comprises: a) a component (A) content of 20-40% by weight; b) a component (B) content of 1-7% by weight; c) a component (C) content of 0.01-0.5% by weight; and d) a pH of 5.0-7.0.

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