Composition for skin cleansing

Abstract

To provide a skin cleansing composition that exhibits exceptionally superior storage stability of formulations during low-temperature storage, and that forms a fine, elastic foam with sustained, high-quality foam. [Solution] A skin cleansing composition characterized by containing the following components A, B, C, and D (excluding those containing cocoyl isethionate). Ingredient A: Amino acid-type anionic surfactant Ingredient B: Amphoteric surfactant Ingredient C: Polyethylene glycol Component D: Alkyl glucoside

Description

Technical Field

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

Background Art

[0002] In skin cleansers, various surfactants such as anionic surfactants, amphoteric surfactants, and nonionic surfactants are adopted as cleaning bases. Among these surfactants, from the viewpoints of safety and peace of mind for the skin, amino acid-type anionic surfactants are used.

[0003] On the other hand, amino acid-type anionic surfactants are known to be inferior in low-temperature stability. In particular, deterioration of low-temperature stability in the form of being discharged in a foamy state from a pump-former container may lead to problems such as poor discharge. Therefore, improving the formulation stability of a cleanser using an amino acid-type anionic surfactant as a cleaning base has been an eternal issue for those skilled in the art.

[0004] Attempts have been made to improve low-temperature stability in cleansers using an amino acid-type anionic surfactant as a cleaning base. Specifically, a liquid detergent composition combining an N-acyl amino acid-type anionic surfactant, an amphoteric surfactant, and polyethylene glycol of a specific molecular weight (see, for example, Patent Document 1), a liquid cleaning composition in a former container combining a specific amount of an N-acyl amino acid-based anionic surfactant, a specific amount of an amphoteric surfactant, and a specific amount of a polyhydric alcohol (see, for example, Patent Document 2), a liquid skin cleansing composition combining an N-acyl amino acid-based anionic surfactant, an amphoteric surfactant, polyoxyethylene alkyl ether sulfate, a specific amount of a polyhydric alcohol, and water (see, for example, Patent Document 3), etc. have been proposed.

[0005] However, although these attempts can improve low-temperature stability to some extent, they are not fully satisfactory in terms of foam quality such as forming fine and elastic bubbles and foam retention for maintaining such bubbles.

Prior Art Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2009-120546 [Patent Document 2] Japanese Patent Publication No. 2010-059247 [Patent Document 3] Japanese Patent Publication No. 2017-210416 [Overview of the project] [Problems that the invention aims to solve]

[0007] This invention has been made in view of the above-mentioned prior art. Specifically, the object of this invention is to provide a skin cleansing composition that exhibits a remarkably superior effect in the storage stability of the formulation when stored at low temperatures, and that forms a fine, elastic foam and maintains that high-quality foam for a long time. [Means for solving the problem]

[0008] The present invention provides a skin cleansing composition (excluding those containing cocoyl isethionate) characterized by containing the following components A, B, C, and D. Ingredient A: Amino acid-type anionic surfactant Ingredient B: Amphoteric surfactant Ingredient C: Polyethylene glycol Component D: Alkyl glucoside

[0009] In the skin cleansing composition of the present invention, it is preferable to further include the following component E. Component E: At least one selected from glycerin, diglycerin, and polyglycerin.

[0010] It is preferable that the mass content ratio of component C to component D (component C / component D) is 6 or less.

[0011] The skin cleansing composition of the present invention is preferably dispensed in a foamy form from a pump foamer container. [Effects of the Invention]

[0012] The skin cleansing composition of the present invention, by satisfying the above constituent requirements, does not produce sediment or precipitate during low-temperature storage, exhibiting remarkably superior storage stability of the formulation. Furthermore, the skin cleansing composition of the present invention has excellent foaming properties, forming a fine, elastic foam, and exhibits excellent foam quality and foam retention, with the foam remaining stable. The above effects of the skin cleansing composition of the present invention can be maximized when used in a form that is dispensed as foam from a pump foamer container. [Modes for carrying out the invention]

[0013] The skin cleansing composition of the present invention contains the following components A, B, C, and D. Ingredient A: Amino acid-type anionic surfactant Ingredient B: Amphoteric surfactant Ingredient C: Polyethylene glycol Component D: Alkyl glucoside

[0014] The details of each component used in the skin cleansing composition of the present invention are described below.

[0015] [Component A] The above-mentioned component A is an amino acid-type anionic surfactant. In the present invention, by using the above-mentioned component A, it becomes possible to form a foam with excellent foaming properties and exhibit a superior cleaning effect.

[0016] Examples of component A include acyl amino acid salts such as acyl glutamate, acyl sarcosine, acyl glycine, acyl methylalanine, acyl methyl taurate, and acyl aspartate. These components A may be used individually or in combination of two or more as appropriate.

[0017] Specific acyl glutamates include, for example, potassium cocoate acyl glutamate (cocoyl glutamate K), sodium cocoate acyl glutamate (cocoyl glutamate Na), triethanolamine cocoate acyl glutamate (cocoyl glutamate TEA), potassium lauroyl glutamate, sodium lauroyl glutamate, triethanolamine lauroyl glutamate, potassium myristoyl glutamate, sodium myristoyl glutamate, potassium stearoyl glutamate, sodium stearoyl glutamate, disodium stearoyl glutamate, sodium hardened beef fat acyl glutamate, sodium cocoate and hardened beef fat acyl glutamate, etc. These components may be used alone or in appropriate combinations of two or more.

[0018] Specific acyl sarcosinates include, for example, sodium cocoate sarcosinate (cocoyl sarcosinate Na), triethanolamine cocoate sarcosinate (cocoyl sarcosinate TEA), sodium lauroyl sarcosinate, triethanolamine lauroyl sarcosinate, sodium myristoyl sarcosinate, etc. These components may be used alone or in appropriate combinations of two or more.

[0019] Specific acyl glycine salts include, for example, potassium cocoate acyl glycine (cocoyl glycine K), sodium cocoate acyl glycine (cocoyl glycine Na), triethanolamine cocoate acyl glycine (cocoyl glycine TEA), etc. These components may be used alone or in appropriate combinations of two or more.

[0020] Specific acylmethylalanine salts include, for example, sodium coconut oil fatty acid methylalanine (cocoyl methylalanine Na), triethanolamine coconut oil fatty acid methylalanine (cocoyl methylalanine TEA), sodium lauroyl methylalanine, triethanolamine lauroyl methylalanine, sodium myristoyl methylalanine, and the like. These components may be used alone or in appropriate combinations of two or more.

[0021] Specific acylmethyltaurine salts include, for example, potassium coconut oil fatty acid methyltaurine (cocoyl methyltaurine K), sodium coconut oil fatty acid methyltaurine (cocoyl methyltaurine Na), sodium coconut oil fatty acid methyltaurine taurine (cocoyl methyltaurine taurine Na), sodium lauroyl methyltaurine, sodium myristoyl methyltaurine, sodium palmitoyl methyltaurine, sodium stearoyl methyltaurine, sodium oleoyl methyltaurine, and the like. These components may be used alone or in appropriate combinations of two or more.

[0022] Specific acylaspartate salts include, for example, sodium lauroyl aspartate, triethanolamine mixed fatty acid (C12, C14) acylaspartate (acyl (C12, C14) aspartate TEA), and the like. These components may be used alone or in appropriate combinations of two or more.

[0023] In the present invention, among the above component A, from the viewpoint of forming high-quality foam rich in foaming properties and exhibiting an excellent cleaning effect, it is preferable to use at least one selected from acylglutamate salts, acylmethyltaurine salts, and acylaspartate salts, and it is more preferable to use acylglutamate salts and / or acylmethyltaurine salts.

[0024] Furthermore, commercially available products can be used for ingredient A. The commercially available product of ingredient A is not particularly limited, as long as the desired effect is achieved, whether it is a single ingredient or a mixture with other ingredients.

[0025] The content of component A in the skin cleansing composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of forming a good quality foam with excellent foaming properties and exhibiting a superior cleansing effect, it is preferably 0.5 to 7% by mass, and more preferably 1 to 5% by mass, of 100% by mass of the composition. Note that the above content of component A is the amount converted to pure content.

[0026] [Component B] The above-mentioned component B is an amphoteric surfactant. In this invention, by using the above-mentioned component B, the foaming power is further enhanced, forming fine, high-quality foam and exhibiting excellent cleaning effects.

[0027] Examples of component B include amino acid-type amphoteric surfactants such as glycine-type amphoteric surfactants and aminopropionic acid-type amphoteric surfactants; and betaine-type amphoteric surfactants such as amidopropyl betaine-type amphoteric surfactants, aminoacetic acid betaine-type amphoteric surfactants, and sulfobetaine-type amphoteric surfactants. These components B may be used individually or in appropriate combinations of two or more types.

[0028] Specific examples of glycine-type amphoteric surfactants include 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, undecylhydroxyethylimidazolinium betaine sodium, undecylcarboxymethoxyethylcarboxymethylimidazolinium betaine sodium, alkyldiamine ethylglycine hydrochloride, and lauryldiaminoethylglycine sodium. These components may be used individually or in combination of two or more as appropriate.

[0029] Specific examples of aminopropionic acid-type amphoteric surfactants include sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate. These components may be used individually or in combination of two or more as appropriate.

[0030] Specific examples of amidopropyl betaine-type amphoteric surfactants include coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine), palm oil fatty acid amidopropyl betaine, and lauric acid amidopropyl betaine. These components may be used individually or in appropriate combinations of two or more.

[0031] Specific examples of aminoacetic acid betaine-type amphoteric surfactants include coconut oil alkyl betaine, lauryldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, lauric acid amidopropyl acetate betaine, and stearyl dihydroxyethyl betaine. These components may be used individually or in appropriate combinations of two or more.

[0032] Specific examples of sulfobetaine-type amphoteric surfactants include lauryl hydroxysulfobetaine (lauryl hydroxysultaine), lauramidopropyl hydroxysultaine, and cocamidopropyl hydroxysultaine. These components may be used individually or in combination of two or more as appropriate.

[0033] In the present invention, among the above-mentioned components B, it is preferable to use a betaine-type amphoteric surfactant, and more preferably an amidopropyl betaine-type amphoteric surfactant, from the viewpoint of further enhancing foaming power by using it in combination with the above-mentioned component A to form fine, high-quality foam and exhibit excellent cleaning effects.

[0034] Furthermore, commercially available products can be used for ingredient B. The commercially available product of ingredient B is not particularly limited, as long as the desired effect is achieved, whether it is a single ingredient or a mixture with other ingredients.

[0035] The content of component B in the skin cleansing composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of forming a fine, high-quality foam with excellent foaming properties and exhibiting a superior cleansing effect, it is generally preferable to have a content of 0.5 to 7% by mass, and more preferably 1 to 5% by mass, of 100% by mass of the composition. Note that the above content of component B is the amount converted to pure content.

[0036] [Component C] The above component C is polyethylene glycol. In this invention, by using the above component C, foaming is enhanced, elastic foam is formed, and the foam can be sustained. This effect is more pronounced when used in a form that is dispensed as foam from a pump foamer container.

[0037] Examples of component C include polyethylene glycol with a number average molecular weight of less than 1000, polyethylene glycol with a number average molecular weight of 1000 or more and 20000 or less, and polyethylene glycol with a number average molecular weight of more than 20000. These components C may be used individually or in combination of two or more as appropriate.

[0038] Examples of polyethylene glycols with a specific number-average molecular weight of less than 1000 include PEG-4 (polyethylene glycol 200), PEG-6 (polyethylene glycol 300), PEG-8 (polyethylene glycol 400), and PEG-12 (polyethylene glycol 600). These components may be used individually or in appropriate combinations of two or more.

[0039] Examples of polyethylene glycols with a number-average molecular weight of 1,000 to 20,000 include PEG-20 (polyethylene glycol 1,000), a mixture of PEG-6 and PEG-32 (polyethylene glycol 1,500), PEG-32 (polyethylene glycol 1,540), PEG-40 (polyethylene glycol 2,000), PEG-75 (polyethylene glycol 4,000), PEG-150 (polyethylene glycol 6,000), PEG-240 (polyethylene glycol 11,000), and PEG-400 (polyethylene glycol 20,000). These components may be used individually or in appropriate combinations of two or more.

[0040] Examples of polyethylene glycols with a specific number-average molecular weight exceeding 20,000 include PEG-2M, PEG-5M, PEG-7M, PEG-9M, PEG-14M, PEG-20M, PEG-23M, PEG-45M, PEG-65M, PEG-90M, PEG-115M, PEG-160M, and PEG-180M. These components may be used individually or in appropriate combinations of two or more.

[0041] In the present invention, among the above-mentioned component C, it is preferable to use polyethylene glycol with a number average molecular weight of 1,000 to 20,000, and more preferable to use polyethylene glycol with a number average molecular weight of 6,000 to 20,000, from the viewpoint of enhancing foaming and forming elastic foam and sustaining that foam.

[0042] Furthermore, commercially available components C can be used. The commercially available components C are not particularly limited, whether they are single ingredients or mixed ingredients with other ingredients, as long as the desired effect is achieved.

[0043] The content of component C in the skin cleansing composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of enhancing foaming, forming and sustaining elastic foam, and exhibiting a more pronounced effect when used in a form that is dispensed as foam from a pump foamer container, the content is preferably 0.1 to 5% by mass, and more preferably 1 to 3% by mass, of 100% by mass of the composition. Note that the above content of component C is the amount converted to pure content.

[0044] [Component D] The above component D is an alkyl glucoside. Alkyl glucosides are nonionic surfactants obtained by condensing a higher alcohol with a glucose polymer. In this invention, by using the above component D, it is possible to suppress the generation of sediment and precipitation during low-temperature storage, and to exhibit significantly superior storage stability of the formulation. Furthermore, because of the excellent storage stability of the formulation, when used in a form that is dispensed as foam from a pump foamer container, it becomes possible to dispense high-quality foam without clogging.

[0045] Specific examples of the above-mentioned component D include (C12-20) alkyl glucoside, arachidyl glucoside, (caprylyl / capryl) glucoside, decyl glucoside, lauryl glucoside, cetearyl glucoside, and coconut oil alkyl glucoside. These components D may be used individually or in combination of two or more as appropriate.

[0046] In the present invention, from the viewpoint of exhibiting exceptionally superior storage stability of the formulation, it is preferable to use at least one selected from (caprylyl / capryl) glucoside, decyl glucoside, and lauryl glucoside among the above components D, and it is more preferable to use decyl glucoside and / or lauryl glucoside.

[0047] Furthermore, commercially available products can be used for ingredient D. The commercially available product of ingredient D is not particularly limited, as long as the desired effect is achieved, whether it is a single ingredient or a mixture with other ingredients.

[0048] The content of component D in the skin cleansing composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved. However, from the viewpoint of suppressing the generation of sediment and precipitation during low-temperature storage and exhibiting exceptionally good storage stability of the formulation, it is preferably 0.1 to 5% by mass, and more preferably 0.5 to 3% by mass, of 100% by mass of the composition. Note that the above content of component D is the amount converted to pure content.

[0049] Furthermore, in the skin cleansing composition of the present invention, from the viewpoint of further improving the storage stability of the formulation when stored at low temperatures, the mass content ratio of the content of component C to the content of component D (component C / component D) is preferably 6 or less, and more preferably 4 or less.

[0050] [Component E] The skin cleansing composition of the present invention preferably further contains at least one selected from glycerin, diglycerin, and polyglycerin as component E. By using component E, it becomes possible to form a finer, more elastic foam without adversely affecting the storage stability of the formulation.

[0051] Furthermore, commercially available products can be used for ingredient E. The commercially available product of ingredient E is not particularly limited, as long as the desired effect is achieved, whether it is a single ingredient or a mixture with other ingredients.

[0052] The content of component E in the skin cleansing composition of the present invention is not particularly limited as long as the desired effect is sufficiently achieved, but it is generally preferable to be 5 to 40% by mass, and more preferably 10 to 30% by mass, of 100% by mass of the composition, from the viewpoint of forming a finer, more elastic foam. Note that the above content of component E is the amount converted to pure content.

[0053] [Other ingredients] The skin cleansing composition of the present invention may, in addition to the components described above, contain surfactants other than components A, B, and D; polyhydric alcohols other than components C and E; high molecular weight compounds such as cationic polymers; higher alcohols, lower alcohols, cooling agents, fragrances, pigments, antioxidants, preservatives, UV absorbers, inorganic pigments, pearlescent agents, vitamins, plant and animal extracts, metal ion chelating agents, purified water, etc., as appropriate depending on the purpose and application, as long as the effects of the present invention are not impaired. The above other components may be used individually or in combination of two or more as appropriate.

[0054] The method for producing the skin cleansing composition of the present invention is not particularly limited, but can be produced by known methods, for example. Specifically, for example, the above components may be mixed and stirred using a paddle mixer, disperser mixer, homomixer, etc., but the present invention is not limited to these production methods.

[0055] The properties of the skin cleansing composition of the present invention are not particularly limited as long as the desired effect is sufficiently achieved, but it may be in any form: liquid, viscous liquid, gel, emulsion, or cream. Among these forms, in the present invention, a liquid form is most preferred because, as described above, its effect can be maximized when it is used in a form that is dispensed as foam from a pump foamer container.

[0056] Therefore, the container in which the skin cleansing composition of the present invention is filled is not particularly limited as long as the composition can be dispensed, and examples include tube containers, bottle containers, and pump-type containers, but among pump-type containers, it is most preferable to fill it in a pump foamer container that can dispense the composition as foam.

[0057] The areas to which the skin cleansing composition of the present invention is applied are not particularly limited as long as the cleansing effect can be exerted, but examples include the face (e.g., forehead, around the eyes, corners of the eyes, cheeks, around the mouth, etc.), arms, elbows, backs of the hands, fingertips, feet, knees, heels, neck, armpits, and back. The skin cleansing composition of the present invention may be a cosmetic, a quasi-drug, or a pharmaceutical. [Examples]

[0058] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts are expressed in "mass%", and all component amounts in the table are converted to pure content. All evaluations were performed under constant temperature conditions (25±2℃).

[0059] (Sample preparation) According to the compositions listed in Tables 1 and 2, skin cleansing compositions for Examples 1-10 and Comparative Examples 1-10 were prepared by conventional methods and subjected to the following evaluation tests. The results are shown in Tables 1 and 2, respectively.

[0060] (Test Example 1: Evaluation of the storage stability of the formulation at low temperatures) Each sample obtained in the examples and comparative examples was sealed in a transparent glass container (100 mL mayonnaise bottle), stored in a constant temperature bath at 5°C for one week, and evaluated by visual inspection of its appearance immediately after removal, according to the following evaluation criteria.

[0061] <Evaluation Criteria for Storage Stability of Pharmaceutical Products> ○ (Good): No sediment or precipitates are observed. △ (Insufficient): Slight sediment or precipitate is observed. × (Poor): Clear sediment or precipitation is observed.

[0062] (Test Example 2: Evaluation of Discharge Capability at Low Temperatures) Each sample obtained in the examples and comparative examples was filled into a 200 mL pump-former container and stored in a 5°C constant temperature bath for one week. Then, the feasibility of dispensing from the pump-former container immediately after removal was evaluated according to the following evaluation criteria.

[0063] <Evaluation criteria for discharge feasibility> ○ (Good): Can dispense × (Defective): Cannot be dispensed.

[0064] (Test Example 3: Evaluation of Foam) Each sample obtained in the examples and comparative examples was filled into a 200 mL pump foamer container. Next, the "foaming ability (foaming)" and "foam quality" of the foam dispensed from the third pump onwards were visually evaluated and scored according to the following 1-5 point scale. In addition, the "elasticity of the foam" was evaluated by sensory evaluation and scored according to the following 1-5 point scale. The evaluation was carried out by five expert evaluators, and the average score of each evaluator's evaluation was determined according to the following criteria.

[0065] The evaluation criteria for "foaming ability (lathering)" were as follows: the higher the volume of foam dispensed after three pumps, the higher the score. The evaluation criteria for "foam quality" were as follows: the finer the texture of the dispensed foam, the higher the score. On the other hand, the evaluation criteria for "foam elasticity" were as follows: three pumps of foam were dispensed onto the palm of one hand, and the foam was lightly pressed down with the four fingers of the remaining hand. The stronger the elasticity of the foam felt when pressed, the higher the score.

[0066] <Evaluation Criteria> 5 points: very good 4 points: Good 3 points: normal 2 points: Defective 1 point: Very poor

[0067] <Judgment criteria> ◎:Average 4.0 or more ○: Average 3.0 or higher but less than 4.0 △: Average 2.0 or higher but less than 3.0 ×: Average less than 2.0

[0068] (Test example 4: Evaluation of foam retention) Each sample obtained in the examples and comparative examples was filled into a 200 mL pump foamer container. Next, five expert evaluators were asked to actually wash their faces using the amount of foam dispensed from the third pump onwards, and a sensory evaluation was conducted on the "foam retention" during washing. Scoring and judgment were made according to the same evaluation criteria as in Test Example 3.

[0069] The evaluation criteria for "foam retention" were based on the length of time the feeling of being enveloped in the formed foam during the washing process lasted; the higher the score, the better.

[0070] [Table 1]

[0071] [Table 2]

[0072] The results shown in Tables 1 and 2 indicate that the skin cleansing compositions of the present invention obtained in each example, compared to those obtained in each comparative example, satisfy the essential components of the present invention, resulting in no sediment formation or precipitation during low-temperature storage and exhibiting significantly superior storage stability of the formulation. This reduces the risk of dispensing failure when used in a form that is dispensed as foam from a pump foamer container.

[0073] Furthermore, the skin cleansing composition of the present invention exhibits excellent foaming properties, forming a fine, elastic foam that is also sustained. These effects can be maximized when the composition is dispensed as foam from a pump foamer container.

[0074] In contrast, Comparative Examples 1, 6, and 9, which do not contain component D, an essential component of the present invention, exhibit significantly inferior storage stability of the formulations at low temperatures. Furthermore, other comparative examples that do not satisfy other essential components also fail to fully exhibit the unique effects of the present invention. As is clear from these results, the present invention can be said to exhibit satisfactory effects in all aspects of "storage stability of the formulation," "foaming ability (lathering)," "foam quality (fineness of texture)," "foam elasticity," and "foam retention" only when the essential components are satisfied.

Claims

1. A skin cleansing composition characterized by containing the following components A, B, C, and D (excluding those containing cocoyl isethionate). Ingredient A: Amino acid-type anionic surfactant Ingredient B: Amphoteric surfactant Component C: Polyethylene glycol Component D: Alkyl glucoside

2. Furthermore, the skin cleansing composition according to claim 1 is characterized by containing the following component E. Component E: At least one selected from glycerin, diglycerin, and polyglycerin.

3. The skin cleansing composition according to claim 1 or 2, characterized in that the mass content ratio of the content of component C to the content of component D (component C / component D) is 6 or less.

4. The skin cleansing composition according to claim 1 or 2, characterized in that it is dispensed in a foamy form from a pump foamer container.

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