Skin cleanser composition

Abstract

To provide a skin cleanser composition with excellent foam volume and foam elasticity, no feeling of tightness after rinsing, a good skin feel after cleansing, and excellent dischargeability when filled into a tube container for use.SOLUTION: A skin cleanser composition contains the following components (A), (B), (C) and (D): (A) a fatty acid represented by the general formula (1), defined by R1-COOX, and salts thereof (where R1 represents a C9-23 alkyl or alkenyl group, and X represents a hydrogen atom, an alkali metal, ammonium, alkanolamine-derived ammonium, or a basic amino acid); (B) 3-15 mass% of an N-acylglycine salt represented by the general formula (2) in the figure (where R2 represents a linear or branched C7-23 alkyl or alkenyl group, and M1 represents an alkali metal or alkanolamine); (C) 10-40 mass% of an at least trihydric polyalcohol; and (D) water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a skin cleansing composition. [Background technology]

[0002] 2. Description of the Related Art Skin cleansing compositions which foam well and give a good feel to the skin after cleansing have been investigated. For example, Patent Document 1 describes that a paste-like cleanser composition containing a higher fatty acid and its salt, an amino acid-based anionic surfactant, and a specific nonionic surfactant has excellent stability at high temperatures, usability at low temperatures, and mildness to the skin, while maintaining the good foaming performance of the higher fatty acid. Patent Document 2 describes that a cleaning composition containing a fatty acid salt and an N-acylglycine-type or N-acylmethylalanine-type amino acid surfactant produces fine foam from the beginning and has long foaming duration. Patent Document 3 describes that a detergent composition containing N-acylglycine or a salt thereof, a higher fatty acid salt or a fatty acid alkanolamide, and an oily component improves the squeaky feeling, the stickiness and the tightness during rinsing, and has an excellent moisturizing effect, without reducing foaming and cleaning power. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-183030 A [Patent Document 2] JP 2017-128625 A [Patent Document 3] Japanese Patent Application Publication No. 8-12993 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional cleansing compositions have excellent foaming properties and foam volume, but have problems with poor foam elasticity and poor skin feel after cleansing. [Means for solving the problem]

[0005] The present inventors have discovered that by using a specific fatty acid and its salt in combination with an N-acylglycine salt and a trihydric or higher polyhydric alcohol in a specific ratio, it is possible to obtain a skin cleansing composition which is excellent in foam volume and foam elasticity, does not leave a tight feeling after rinsing, and leaves the skin with a good feel after cleansing, and have completed the present invention.

[0006] The present invention comprises the following components (A), (B), (C) and (D): (A) General formula (1) R 1 -COOX (1) (In the formula, R 1 represents an alkyl or alkenyl group having 9 to 23 carbon atoms, and X represents a hydrogen atom, an alkali metal, ammonium, ammonium derived from an alkanolamine, or a basic amino acid. and salts thereof, (B) General formula (2):

[0007] [ka]

[0008] (In the formula, R 2 represents a linear or branched alkyl or alkenyl group having 7 to 23 carbon atoms; M 1 indicates an alkali metal or alkanolamine) 3 to 15 mass % of an N-acylglycine salt represented by the formula: (C) 10 to 40 mass% of a trihydric or higher polyhydric alcohol, (D)Water The present invention relates to a skin cleansing composition comprising the above-mentioned compound. Effect of the Invention

[0009] The skin cleansing composition of the present invention has excellent foam volume and foam elasticity, does not leave a tight feeling after rinsing, and leaves a good feel on the skin after cleaning. In addition, when filled in a tube container for use, it has excellent dischargeability. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The fatty acid and its salt as component (A) used in the present invention are represented by the above general formula (1). In general formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 9 to 23 carbon atoms. In general formula (1), R 1 From the viewpoint of improving the foam volume, the number of carbon atoms is preferably from 11 to 17, and more preferably from 11 to 15. Moreover, from the viewpoint of improving the foam volume and foam elasticity, a straight chain is preferable. Specific examples include salts of lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachic acid, behenic acid, etc. Among these, from the viewpoint of improving the ejection properties when filled into a tube container, it is preferable to contain at least one or two or more selected from lauric acid, myristic acid, palmitic acid, and stearic acid, and it is more preferable to contain at least one or two or more selected from lauric acid, myristic acid, and palmitic acid. Examples of X include a hydrogen atom; alkali metals such as sodium and potassium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine and triethanolamine; and basic amino acids such as arginine and lysine. From the viewpoint of improving the foam volume, an alkali metal is preferred, and potassium is more preferred.

[0011] The fatty acid salt of component (A) can be present in the composition, for example, by mixing an unneutralized fatty acid with a neutralizing agent in the composition to form the fatty acid salt. The neutralizing agent is a compound exhibiting basicity, and examples thereof include sodium hydroxide, potassium hydroxide, triethanolamine, basic amino acids, etc. Among these, from the viewpoint of improving the foam volume, it is preferable to contain at least one or more selected from potassium hydroxide and sodium hydroxide, and it is more preferable to contain at least potassium hydroxide.

[0012] From the viewpoint of improving foam volume and foam elasticity, the neutralization rate of component (A) is preferably from 75 to 88%, more preferably from 77 to 87%, and even more preferably from 79 to 86%.

[0013] One or more kinds of component (A) can be used, and the content is preferably 18 to 30 mass% as fatty acid in the total composition, more preferably 20 to 27 mass%, and even more preferably 22.5 to 24.5 mass%, from the viewpoints of improving the foam volume, improving foam elasticity, reducing the feeling of tightness on the skin after rinsing, and improving the dischargeability when filled into a tube container for use. The content of component (A) indicates the content as an acid.

[0014] The component (B) used in the present invention is an N-acylglycine salt represented by the above general formula (2). In general formula (2), R 2 As the alkyl group, an alkyl group having 9 to 21 carbon atoms is preferable, and an alkyl group having 11 to 19 carbon atoms is more preferable. Specific examples of fatty acid residues constituting the acyl group of the N-acylglycine salt of component (B) include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, behenic acid, etc., which may be derived from animals or plants, and examples of such acids include coconut oil fatty acid, palm oil fatty acid, and hardened beef tallow fatty acid, etc. Among these, from the viewpoint of improving the foam volume and foam elasticity and reducing the feeling of tightness on the skin after rinsing, it is preferable to include one or more selected from lauric acid, myristic acid, palmitic acid, stearic acid, and coconut oil fatty acid, more preferably to include one or more selected from lauric acid, myristic acid, and coconut oil fatty acid, and even more preferably to include coconut oil fatty acid.

[0015] In general formula (2), M 1 Examples of the additive include alkali metals such as sodium and potassium, and alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, etc. Among these, from the viewpoint of improving the foam volume, alkali metals are preferred, one or more selected from sodium and potassium are more preferred, and potassium is even more preferred.

[0016] Examples of the N-acylglycine salt of component (B) include alkali metal salts or alkanolamine salts of lauroyl glycine, myristoyl glycine, palmitoyl glycine, stearoyl glycine, coconut oil fatty acid acylglycine, palm oil fatty acid acylglycine, and the like. Among these, from the viewpoints of improving the foam volume and foam elasticity and reducing the feeling of tightness on the skin after rinsing, it is preferable to contain one or more selected from lauroyl glycine, myristoyl glycine, palmitoyl glycine, stearoyl glycine, and alkali metal salts of coconut oil fatty acyl glycine, it is more preferable to contain one or more selected from lauroyl glycine, myristoyl glycine, and alkali metal salts of coconut oil fatty acyl glycine, it is even more preferable to contain alkali metal salts of coconut oil fatty acyl glycine, and it is even more preferable to contain potassium coconut oil fatty acyl glycine.

[0017] One or more kinds of component (B) can be used, and the content is 3 to 15% by mass, preferably 4 to 14% by mass, more preferably 6 to 13% by mass, and even more preferably 8 to 11% by mass, based on the total composition, from the viewpoints of improving the foam volume, improving foam elasticity, reducing the feeling of tightness on the skin after rinsing, and improving the dischargeability when filled into a tube container for use. The content of component (B) indicates the content as a salt.

[0018] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.5 to 10, more preferably 1 to 6, even more preferably 2 to 3.5, and even more preferably 2.3 to 2.5, from the viewpoints of improving the foam volume, improving foam elasticity, reducing the feeling of tightness on the skin after rinsing, and improving the dischargeability when filled into a tube container for use.

[0019] The trihydric or higher polyhydric alcohol of component (C) is a compound having three or more hydroxyl groups in the molecule, and may be any of those commonly used in skin cleansing compositions. Examples of trihydric alcohols include glycerin, trimethylolpropane, polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3B.O.) (8E.O.) (5P.O.), etc. Examples of tetrahydric alcohols include diglycerin, erythritol, etc. Examples of polyhydric alcohols having a valence of five or more include polyglycerins such as triglycerin; sugars such as glucose, maltose, maltose, sucrose, xylitol, sorbitol, and malbitol; polyoxyethylene methyl glucosides such as polyoxyethylene methyl glucoside (10E.O.) and polyoxyethylene methyl glucoside (20E.O.), polyoxyethylene ethyl glucoside, polyoxypropylene methyl glucoside, and polyoxyethylene propylene glucoside, etc.

[0020] From the viewpoints of improving the amount and elasticity of foam and reducing the feeling of tightness on the skin after rinsing, component (C) preferably contains a trihydric alcohol, and more preferably contains at least glycerin.

[0021] One or more types of component (C) can be used, and the content is 10 to 40 mass% of the total composition, preferably 15 to 38 mass%, more preferably 20 to 36 mass%, even more preferably 23 to 34 mass%, and even more preferably 28 to 33 mass%, from the viewpoints of improving the foam volume and foam elasticity and improving the dischargeability when filled into a tube container for use.

[0022] In the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.1 to 1, more preferably 0.14 to 0.8, and even more preferably 0.23 to 0.5, from the viewpoints of improving foam volume and foam elasticity and reducing a feeling of tightness on the skin after rinsing.

[0023] In the present invention, the water of component (D) constitutes the balance of each component, and from the viewpoint of improving the dischargeability when filled into a tube container for use, the content of water is preferably 13 to 24 mass% of the total composition, more preferably 15 to 22 mass%, and even more preferably 17 to 20 mass%.

[0024] The skin cleansing composition of the present invention may further contain (E) polyethylene glycol having a number average molecular weight of 200 to 6000. The number average molecular weight of the polyethylene glycol of component (E) is preferably 300 to 4000, more preferably 1000 to 2000. Examples of such polyethylene glycols that can be used include commercially available products such as polyethylene glycol 200 (number average molecular weight 200), polyethylene glycol 300 (number average molecular weight 300), polyethylene glycol 400 (number average molecular weight 400), polyethylene glycol 600 (number average molecular weight 600), polyethylene glycol 1000 (number average molecular weight 1000), polyethylene glycol 1540 (number average molecular weight 1450), polyethylene glycol 1500 (number average molecular weight 1540), and polyethylene glycol 2000 (number average molecular weight 2000) (all manufactured by Sanyo Chemical Industries). The number average molecular weight is measured by the method described in the revised edition of the Cosmetic Raw Materials Standards (August 30, 1999, 1st edition, Yakuji Nipposha) and the Cosmetic Type Ingredient Standards (April 18, 1997, 1st edition, Yakuji Nipposha).

[0025] Component (E) may be used alone or in combination with two or more kinds, and from the viewpoint of improving foam elasticity, the content is preferably 5 to 12 mass% of the total composition, more preferably 6.5 to 10 mass%, even more preferably 7.2 to 8.6 mass%, and even more preferably 7.6 to 8.2 mass%.

[0026] The skin cleansing composition of the present invention may further contain a glycerin fatty acid ester. As the glycerin fatty acid ester, from the viewpoint of improving foam elasticity, a glycerin monofatty acid ester is preferable. As the glycerin monofatty acid ester, one having a residue of a fatty acid having 10 to 24 carbon atoms is preferable, one having a residue of a fatty acid having 16 to 24 carbon atoms is more preferable, and one having a residue of a fatty acid having 18 to 24 carbon atoms is even more preferable. In addition, the "fatty acid" constituting the glycerin monofatty acid ester may be a saturated fatty acid or an unsaturated fatty acid, and may be a straight-chain fatty acid or a branched fatty acid. As the glycerin monofatty acid ester, one having a residue of a saturated fatty acid is preferable, and one having a residue of a straight-chain saturated fatty acid is more preferable. Examples of glycerin monofatty acid esters include glycerin monolaurate, glycerin monomyristate, glycerin monopalmitate, glycerin monostearate, glycerin monobehenate, glycerin monooleate, glycerin monoisostearate, glycerin monolinoleate, etc. Among these, glycerin monostearate and glycerin monobehenate are preferred.

[0027] The glycerin fatty acid esters can be used alone or in combination of two or more kinds. From the viewpoint of improving foam elasticity, the content is preferably 0.5 to 3 mass% of the total composition, more preferably 1 to 2 mass%, and even more preferably 1.5 to 1.65 mass%.

[0028] The skin cleanser composition of the present invention may contain, in addition to the above-mentioned components, components used in ordinary skin cleanser compositions, such as surfactants other than components (A) and (B), oily components, pH adjusters, bactericides, anti-inflammatory agents, preservatives, chelating agents, salts, pearlizing agents, scrubbing agents, fragrances, cooling agents, colorants, ultraviolet absorbers, antioxidants, plant extracts, etc.

[0029] The skin cleansing composition of the present invention can be produced according to a conventional method, for example, by the following steps. Step 1: Mixing components (C), (D), other aqueous components, and an alkaline agent. Step 2: A step of adding component (A) heated to 70-90°C to the mixture of step 1 heated to 70-90°C and mixing uniformly. Step 3: A step of sequentially adding and mixing components (B), (E), and other components to the mixture obtained in step 2. Step 4: The mixture of step 3 is cooled to a temperature in the range of 20 to 35° C. to obtain a skin cleansing composition.

[0030] The skin cleansing composition of the present invention is preferably in the form of a cream or a paste, and is suitable for use by filling it into a tube container. From the viewpoint of improving the dischargeability when filled into a tube container for use, the skin cleansing composition of the present invention has a viscosity at 20°C of preferably 100 to 2000 Pa·s, more preferably 200 to 1500 Pa·s, and even more preferably 300 to 1000 Pa·s. In the present invention, the viscosity is measured under the following conditions. Measuring equipment: Spindle viscometer (manufactured by Toki Sangyo Co., Ltd.), Measuring tool: TF, Rotation speed: 5 rpm, Measurement time: 60 seconds, Measurement temperature: 20℃

[0031] The skin cleansing composition of the present invention is used for cleansing the skin and can be used as a hand soap, a facial cleanser, a body soap, etc. The skin cleansing composition of the present invention can be used to cleanse the skin, for example, by lathering it, applying it to the skin, and then rinsing it off with water. EXAMPLES

[0032] Examples 1 to 7 and Comparative Examples 1 to 5 Skin cleansing compositions having the compositions shown in Table 1 were prepared and evaluated for foam elasticity, foam volume, skin feel after cleansing (lack of tightness), and dischargeability from a tube. The results are also shown in Table 1.

[0033] (Manufacturing method) (1) Components (C), (D), other aqueous components, and an alkaline agent are mixed together. (2) Component (A) heated to 70-90°C is added to the mixture of (1) heated to 70-90°C and mixed uniformly. (3) Components (B), (E) and other components are added sequentially to the mixture obtained in (2) and mixed. The mixture of (4) and (3) was cooled to a temperature in the range of 20 to 35° C. to obtain a skin cleansing composition.

[0034] (Evaluation method) (1) Foam elasticity: Three expert evaluators used 2 g of each skin cleansing composition, diluted 10 times with water, to create a lather in their hands for 30 seconds, and then pressed the palms of their hands together while holding the lather in that state. The elasticity of the lather was evaluated according to the following criteria. The results were shown as the total score of the three evaluators. 5: It has sufficient elasticity. 4: Elastic. 3: Slightly elastic. 2: No elasticity. 1: No elasticity at all.

[0035] (2) Foam volume: Three expert evaluators took 2 g of each skin cleansing composition, used 8 g of water, and lathered it for 20 seconds. The amount of foam produced was evaluated according to the following criteria. The results were shown as the total score of the three evaluators. 5: The amount of foam is clearly greater. 4: High foam volume. 3: The amount of foam is somewhat large. 2: Low foam volume. 1: Does not foam.

[0036] (3) Skin feel after washing (no tightness): Three expert evaluators worked 2 g of each skin cleansing composition into foam using 10 times the amount of water for 30 seconds, washed their faces, rinsed thoroughly until all the foam disappeared, and then towel-dried the skin. The results were evaluated according to the following criteria. The total score of the three evaluators was shown. 5: No tightness. 4: Almost no tightness. 3: Somewhat tight. 2: Tight. 1: Very tight.

[0037] (4) Dischargeability from the tube: (i) 50 g of each skin cleansing composition is filled into a tube having a hole diameter of 8φ, a tube diameter of 35φ, and a tube length of 10 cm (manufactured by Yoshino Kogyosho Co., Ltd.). (ii) After storing at 20°C for 24 hours, three expert evaluators evaluated the dischargeability from the tube according to the following criteria. The results are shown as the total score of the three evaluators. 5: Can be discharged with moderate force. 4: Can be discharged with a relatively large force. 3: It can be discharged with great force. 2: Somewhat ejection is possible with a large force. 1: Discharge is not possible

[0038] [Table 1]

[0039] *1: Lauric acid (POFAC 1299), SOUTHERN ACIDS INDUSTRIES SDN. BHD. *2: Myristic acid (POFAC 1498), SOUTHERN ACIDS INDUSTRIES SDN. BHD. *3:NAA-160 (external JIS), NOF Corporation, *4: Amirite GCK-11(F), Ajinomoto Co., Inc. *5: Montex S, Miyoshi Oil Co., Ltd. *6: PEG#1500 (number average molecular weight 1540), NOF Corporation, *7: Glycerin SK, Sakamoto Pharmaceutical Co., Ltd.

[0040] Test Example 1 The storage modulus (G') of the skin cleansing compositions of Example 1 and Comparative Example 5 was measured as an index of foam elasticity using Anton Paar Physica MCR301. The measuring tool was a parallel plate PP-50, and the measuring temperature was 20°C. The G' value at a shear stress of 1.5 Pa was taken as the foam elasticity. As a result, in Example 1, G'=22.5, and in Comparative Example 5, G'=15.8. It was confirmed that the skin cleansing composition of Example 1 had a higher G' value than Comparative Example 2, and had higher foam elasticity.

[0041] Prescription Example 1 In the same manner as in Examples 1 to 7, skin cleansing compositions having the compositions shown in Table 2 were produced. The obtained skin cleansing composition has excellent foam volume and foam elasticity, does not leave a tight feeling after rinsing, and leaves a good feel on the skin after cleaning. In addition, when filled into a tube container for use, the composition has excellent dischargeability.

[0042] [Table 2]

Claims

1. The following components (A), (B), (C), and (D): (A) General formula (1) R 1 -COLOR (1) (In the formula, R 1 represents an alkyl or alkenyl group having 9 to 23 carbon atoms, and X represents a hydrogen atom, an alkali metal, ammonium, ammonium derived from an alkanolamine, or a basic amino acid. Fatty acids and salts thereof represented by the formula: (B) General formula (2): 【Chemical 1】 (In the formula, R 2 represents a linear or branched alkyl or alkenyl group having 7 to 23 carbon atoms; M 1 indicates an alkali metal or alkanolamine) 3 to 15 mass% of an N-acylglycine salt represented by the formula: (C) 10 to 40 mass% of a trihydric or higher polyhydric alcohol, (D) Water A skin cleansing composition comprising:

2. 2. The skin cleanser composition according to claim 1, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.1 to 1.

3. 3. The skin cleanser composition according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 0.5 to 10.

4. 3. The skin cleanser composition according to claim 1, wherein the component (C) contains at least glycerin.

5. 3. The skin cleanser composition according to claim 1, further comprising (E) polyethylene glycol having a number average molecular weight of 200 to 6,000.

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