Skin cleanser composition

Abstract

To provide a skin cleansing composition that has an excellent cleansing power against pore dirt and a smooth feeling when rinsing, has no difference in the feeling of use depending on the moisture on the skin or the presence or absence of makeup cosmetics, and can improve the permeability of a lotion.SOLUTION: Provided is a skin cleansing composition containing: (A) 5 to 40 mass% of polyoxyethylene monofatty acid glyceryl; (B) 1 to 10 mass% of polyoxyethylene glycerin; (C) 2 to 20 mass% of dihydric alcohol having 3 to 6 carbon atoms; (D) 0.02 to 0.6 mass% of acrylic acid-based thickening polymer; (E) 0.02 to 0.6 mass% of 2-phenoxyethanol ; and water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cleanser composition used for cleansing the skin of the face, body, etc. [Background technology]

[0002] Skin cleansers come in a variety of formulations, and the most common are liquid cleansers that are foamed by adding water, but due to increased awareness of time-saving and their convenience, foam-type cleansers that come out as foam are on the rise.Furthermore, in recent years, there has been an increasing demand for skin cleansers that can be used without foaming.

[0003] When using cleansers that require adding water to create foam, the beauty ingredients contained in the cleanser are diluted by the addition of water during use. Furthermore, foam-type cleansers are difficult to incorporate high amounts of beauty ingredients into, as this can clog the mesh. In contrast, cleansers that are used without foaming can incorporate high amounts of beauty ingredients, allowing a high concentration of beauty ingredients to come into contact with the skin.

[0004] Cleansing agents that are used without foaming are required to have cleansing power, just like foaming cleansers. For example, Patent Document 1 discloses that by combining an alcohol with two or fewer hydroxyl groups, glycerin, an alcohol with four or more hydroxyl groups, and a nonionic surfactant, a skin cleanser can be obtained that has sufficient pore cleansing effect, leaves a refreshing feeling after washing, and is gentle on the skin. However, this skin cleanser does not leave a smooth feeling after rinsing.

[0005] If a skin cleanser can provide a smooth feeling on the skin when rinsing, the pore cleansing effect can be enhanced. For example, Patent Document 2 discloses a skin cleanser composition containing specific copolymer particles as a scrubbing agent, which leaves the skin feeling smooth after cleansing. However, cleansers containing scrubbing agents such as copolymer particles can cause irritation during use, and the scrubbing agents may be released into the environment and cause environmental impact as marine microplastics. Therefore, there has been a demand for a skin cleanser that does not contain a scrubbing agent and has excellent pore cleansing effect and a smooth feeling when rinsing.

[0006] When using a skin cleanser to cleanse the skin, the spreadability and thickness of the cleanser may vary depending on the moisture on the skin and the presence or absence of makeup. Therefore, there is a need for a cleanser that does not change much in spreadability and thickness when applied, even when used in different situations.

[0007] After using a skin cleanser, skin care is usually performed using a lotion or body lotion, but in recent years, there has been a demand for shortening the time required for skin care. Therefore, if a skin cleanser could be imparted with the effect of increasing the penetration of lotion, it would be possible to shorten the skin care time. However, it has not been easy to impart the effect of increasing the penetration of lotion to a skin cleanser. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-221121 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-56148 Summary of the Invention [Problem to be solved by the invention]

[0009] At present, a skin cleanser composition that has excellent cleansing power against pore grime and a smooth feeling upon rinsing, that does not differ in feel when used regardless of moisture on the skin or the presence or absence of makeup cosmetics, and that can improve the penetration of lotion has not yet been developed.

[0010] An object of the present invention is to provide a skin cleanser composition that has excellent detergency against pore dirt and a smooth feeling when rinsing, that does not differ in feel when used regardless of the presence or absence of moisture or makeup on the skin, and that can improve the penetration of lotion. [Means for solving the problem]

[0011] As a result of extensive research to achieve the above object, the present inventors have found that by selecting specific components and adjusting the content thereof within a specific range, it is possible to obtain a skin cleanser composition that exhibits the desired effects, and have thus completed the present invention. Based on this finding, the present invention is as follows.

[0012] [1] The following components (A) to (E): (A) polyoxyethylene monofatty acid glyceryl content of 5 to 40 mass%, (B) polyoxyethylene glycerin at a content of 1 to 10% by mass, (C) a dihydric alcohol having 3 to 6 carbon atoms in an amount of 2 to 20% by mass, (D) an acrylic acid-based thickening polymer in an amount of 0.02 to 0.6% by mass, and (E) 2-phenoxyethanol at a content of 0.02 to 0.6% by mass, and a skin cleansing composition containing water. The contents of the above components (A) to (E) are each values ​​relative to the total amount of the skin cleanser composition. [Effects of the Invention]

[0013] The skin cleanser composition of the present invention has excellent cleansing power against pore dirt and a smooth feeling upon rinsing, and does not cause any difference in the feel when used regardless of the presence or absence of moisture on the skin or makeup cosmetics, and can improve the penetration of lotions. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described. In this specification, numerical ranges defined using the symbol "to" include the numerical values ​​at both ends (upper and lower limits) of the symbol "to." For example, "2 to 5" means 2 or more and 5 or less.

[0015] The skin cleanser composition of the present invention contains components (A) to (E) and water. Each of the components (A) to (E) may be used alone or in combination of two or more. Each component will be described below.

[0016] <Component (A): Polyoxyethylene monoglyceryl fatty acid> Component (A) used in the present invention is a polyoxyethylene mono-fatty acid glyceryl. Here, "polyoxyethylene mono-fatty acid glyceryl" refers to a compound having a structure in which one hydroxy group of glycerin forms an ester bond with a fatty acid and ethylene oxide is added to the remaining two hydroxy groups.

[0017] Examples of polyoxyethylene mono-fatty acid glyceryl include polyoxyethylene coconut oil fatty acid glyceryl, polyoxyethylene (caprylic / capric acid) glyceryl, polyoxyethylene glyceryl laurate, polyoxyethylene glyceryl oleate, polyoxyethylene glyceryl isostearate, etc., and polyoxyethylene coconut oil fatty acid glyceryl is preferred. The number of moles of ethylene oxide added in the polyoxyethylene mono-fatty acid glyceryl is preferably 5 to 30, more preferably 6 to 20, and particularly preferably 7 to 10.

[0018] The content of component (A) is 5 to 40% by mass, preferably 10 to 35% by mass, and more preferably 15 to 30% by mass, based on the total mass of the skin cleanser composition. If this content is less than 5% by mass, the cleansing power for pore dirt may be insufficient, or the feeling of use may vary greatly depending on the usage conditions. If this content exceeds 40% by mass, the smooth feeling after rinsing may not be sufficient.

[0019] <Component (B): Polyoxyethylene glycerin> The component (B) used in the present invention is polyoxyethylene glycerin. Here, "polyoxyethylene glycerin" is a compound having a structure in which ethylene oxide is added to each of the three hydroxy groups of glycerin. The number of moles of ethylene oxide added in the polyoxyethylene glycerin is preferably 5 to 30, more preferably 6 to 20, and particularly preferably 7 to 10.

[0020] The content of component (B) is 1 to 10% by mass, preferably 3 to 9% by mass, and more preferably 4 to 8% by mass, based on the total mass of the skin cleanser composition. If this content is less than 1% by mass, the smooth feeling after rinsing may be insufficient, the effect of improving the penetration of lotion may be insufficient, or the feeling of use may vary greatly depending on the usage conditions. If this content exceeds 10% by mass, the effect of improving the penetration of lotion may be insufficient.

[0021] <Component (C): Dihydric Alcohol Having 3 to 6 Carbon Atoms> Component (C) used in the present invention is a dihydric alcohol having 3 to 6 carbon atoms. Examples of dihydric alcohols having 3 to 6 carbon atoms include 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and dipropylene glycol. Among these, from the viewpoints of cleansing power for pore dirt and smooth feeling during rinsing, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,5-pentanediol, and dipropylene glycol are preferred, 1,2-propanediol, 1,3-butanediol, 1,5-pentanediol, and dipropylene glycol are more preferred, and 1,2-propanediol, 1,3-butanediol, and dipropylene glycol are particularly preferred.

[0022] The content of component (C) is 2 to 20% by mass, preferably 4 to 16% by mass, and more preferably 6 to 12% by mass, based on the total mass of the skin cleanser composition. If this content is less than 2% by mass, the cleansing power for pore dirt may be insufficient, or the smooth feeling after rinsing may be insufficient. If this content is more than 20% by mass, the smooth feeling after rinsing may be insufficient.

[0023] <Component (D): Acrylic acid-based thickening polymer> Component (D) used in the present invention is an acrylic acid-based thickening polymer. Here, the term "acrylic acid-based thickening polymer" refers to a polymer that has structural units derived from acrylic acid and / or structural units derived from alkyl acrylate and has thickening properties.

[0024] Examples of acrylic acid-based thickening polymers include carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers. Here, "carboxyvinyl polymer" refers to a polymer of primarily acrylic acid crosslinked with allyl sucrose, allyl ether of pentaerythritol, or the like. Furthermore, "alkyl-modified carboxyvinyl polymer" refers to a copolymer of acrylic acid or methacrylic acid and alkyl acrylate crosslinked with allyl sucrose, allyl ether of pentaerythritol, or the like. Component (D) is preferably a carboxyvinyl polymer and / or an alkyl-modified carboxyvinyl polymer.

[0025] Examples of the alkyl group of the alkyl acrylate constituting the alkyl-modified carboxyvinyl polymer (ie, the alkyl group bonded to —CO—O) include linear or branched alkyl groups having 10 to 30 carbon atoms.

[0026] As an index of the size of an acrylic acid-based thickening polymer (particularly, a carboxyvinyl polymer or an alkyl-modified carboxyvinyl polymer), the viscosity of an aqueous dispersion of the polymer at a concentration of 0.5% by mass, whose pH has been adjusted to 5.5 by neutralization with a base (e.g., potassium hydroxide or arginine), can be used. The viscosity of an aqueous dispersion (concentration: 0.5% by mass, pH: 5.5) of an acrylic acid-based thickening polymer (particularly, a carboxyvinyl polymer or an alkyl-modified carboxyvinyl polymer) is preferably 5 to 200 Pa·s, more preferably 10 to 150 Pa·s, and particularly preferably 15 to 100 Pa·s, from the viewpoint of minimizing variations in the feel during use depending on the usage conditions. This viscosity can be measured using a Brookfield B-type viscometer.

[0027] Commercially available carboxyvinyl polymers include, for example, "AQUPEC HV-505E" manufactured by Sumitomo Seika Chemicals Co., Ltd., "Carbopol Ultrez10," "Carbopol 940," and "Carbopol 941" manufactured by The Lubrizol Japan Co., Ltd., and "Synthalen K" and "Synthalen L" manufactured by 3V Sigma. Commercially available alkyl-modified carboxyvinyl polymers include, for example, "AQUPEC HV-501ER" manufactured by Sumitomo Seika Chemicals Co., Ltd., and "Carbopol 1342" and "Carbopol ETD2020" manufactured by The Lubrizol Japan Co., Ltd.

[0028] The content of component (D) is 0.02 to 0.6% by mass, preferably 0.05 to 0.55% by mass, and more preferably 0.1 to 0.5% by mass, based on the total mass of the skin cleanser composition. If this content is less than 0.02% by mass, the smooth feeling after rinsing may be insufficient, or the difference in the feeling after use may be significant depending on the usage conditions. If this content is more than 0.6% by mass, the cleansing power for pore dirt may be insufficient, or the smooth feeling after rinsing may be insufficient.

[0029] <Ingredient (E): 2-phenoxyethanol> The component (E) used in the present invention is 2-phenoxyethanol. The content of component (E) is 0.02 to 0.6% by mass, preferably 0.05 to 0.55% by mass, and more preferably 0.1 to 0.5% by mass, based on the total mass of the skin cleanser composition. If this content is less than 0.02% by mass, the cleansing power against pore dirt may be insufficient, or the effect of improving the penetration of lotion may be insufficient. If this content is more than 0.6% by mass, the effect of improving the penetration of lotion may be insufficient.

[0030] From the viewpoint of improving the penetration of the lotion, the mass ratio of the contents of component (B) and component (E) (content of component (B) / content of component (E)) is preferably 10 to 40, and particularly preferably 15 to 25.

[0031] <Water> The skin cleansing composition of the present invention contains water in addition to the above components (A) to (E), and the water is preferably deionized water, ion-exchanged water, or distilled water.

[0032] The content of water is determined by the total content of the above components (A) to (E) and water, and is preferably 60% by mass or more, more preferably 65 to 100% by mass, and particularly preferably 70 to 90% by mass, based on the total mass of the skin cleanser composition.

[0033] <Other added ingredients> The skin cleanser composition of the present invention may contain one or more components other than the above-mentioned components (A) to (E) and water (sometimes referred to herein as "other additive components"). Each of the other additive components may be used alone or in combination of two or more.

[0034] Other additives are not particularly limited as long as they are common ingredients used in cosmetics. Examples include oils, fatty acids, pH adjusters, antioxidants, sequestering agents, coloring materials, fragrances, pigments, etc. The content of other additive components (when multiple other additive components are used, the total content thereof) is preferably 40% by mass or less, and more preferably 30% by mass or less, of the total amount of the detergent composition.

[0035] The skin cleanser composition of the present invention can be used as a cleansing cosmetic that removes makeup cosmetics. When the skin cleanser composition of the present invention is used as a cleansing cosmetic, it preferably contains a liquid oil from the viewpoint of compatibility with makeup cosmetics. The liquid oil may be a liquid oil commonly used in cosmetics, pharmaceuticals, etc. The liquid oil may be either a polar oil or a non-polar oil. Examples of polar oils include triglycerides (e.g., olive oil) and ester oils (e.g., cetyl ethylhexanoate). Examples of non-polar oils include hydrocarbon oils (e.g., hydrogenated polyisobutene) and silicone oils (e.g., dimethicone). It is preferable to use one or more polar oils and one or more non-polar oils in combination. When a liquid oil is used, its content is preferably 10 to 30% by mass, more preferably 14 to 20% by mass, based on the total mass of the skin cleanser composition.

[0036] The skin cleanser composition of the present invention can be produced by a known method, for example, by mixing components (A) to (E) and water, and, if necessary, other additive components, heating the mixture to homogeneity, and then cooling the mixture to about room temperature while stirring.

[0037] To minimize variations in feel during use depending on the conditions of use, it is preferable to add a pH adjuster to the skin cleanser composition as another additive. The pH of the skin cleanser composition is preferably 4.5 to 7.5, more preferably 5.0 to 7.0, and particularly preferably 5.3 to 6.7. When a pH adjuster is used, it is preferable to appropriately adjust the amount of pH adjuster added so that the pH of the skin cleanser composition falls within the above range. Examples of pH adjusters include potassium hydroxide and arginine. [Example]

[0038] The present invention will be described in more detail below with reference to examples and comparative examples.

[0039] <Examples 1 to 14 and Comparative Examples 1 to 5> Skin cleanser compositions were prepared by mixing the components in the amounts shown in Table 1 (Examples 1 to 14) and Table 2 (Comparative Examples 1 to 5), and evaluated by the following methods. The results are shown in Tables 1 and 2. The numerical value for each component in Tables 1 and 2 indicates the content (mass%) of each component relative to the total skin cleanser composition, "pH" in Tables 1 and 2 indicates the pH of the skin cleanser composition, and "(B) / (E)" in Tables 1 and 2 indicates the mass ratio of the content of component (B) to the content of component (E) (content of component (B) / content of component (E)).

[0040] In addition, in Examples 1 to 14 and Comparative Examples 1 to 5, "Carbopol 941" manufactured by Lubrizol Japan, Ltd. was used as the carboxyvinyl polymer, "Carbopol ETD2020" manufactured by Lubrizol Japan, Ltd. was used as the alkyl-modified carboxyvinyl polymer, and potassium hydroxide was used as the pH adjuster.

[0041] <Evaluation method> (1) Evaluation of cleansing power against pore dirt Twenty female panelists aged between 25 and 55 washed their faces with 3 g of the skin cleanser composition, and then evaluated the cleansing power against pore dirt according to the following criteria. (Evaluation criteria) 2 points: No blackheads at all 1 point: Almost no blackheads in pores 0 points: Blackheads

[0042] (2) Evaluation of smooth feeling after rinsing Twenty women aged between 25 and 55 were used as panelists, who washed their faces with 3 g of the skin cleanser composition, then rinsed with lukewarm water and evaluated the smooth feeling according to the following criteria. (Evaluation criteria) 2 points: Very smooth 1 point: Slightly smooth 0 points: No smooth feeling

[0043] (3) Evaluation of the penetration of lotion Twenty women aged between 25 and 55 were used as panelists. They washed their faces with 3 g of the skin cleanser composition, then rinsed with lukewarm water. After that, they towel-dried their faces and applied lotion. The penetration of the lotion was evaluated according to the following criteria. (Evaluation criteria) 2 points: Very good penetration of lotion 1 point: Has some lotion-like penetration 0 points: No penetration of lotion

[0044] (4) Evaluation of differences in usability Twenty women aged 25 to 55 who wore makeup cosmetics served as panelists. They washed their made-up faces with 3 g of the skin cleanser composition and then rinsed with lukewarm water (first wash). Then, with their hands and faces still wet, they washed their faces with 3 g of the skin cleanser composition and then rinsed with lukewarm water (second wash). The difference in the feel of the skin cleanser composition after the first and second washes was evaluated according to the following criteria. (Evaluation criteria) 2 points: There is almost no difference in the spreadability or thickness of the skin cleanser composition. 1 point: There is little difference in the spreadability or thickness of the skin cleanser composition. 0 points: There is a difference in the spreadability and thickness of the skin cleanser composition.

[0045] The above evaluations (1) to (4) were judged according to the following criteria. The results are shown in Tables 1 and 2. "◎" and "◯" were judged as passing. (Judgment criteria) ◎: Total score is 35 points or more ○: Total score is between 30 and 34 points △: Total score is between 20 and 29 points ×: Total score is 19 points or less

[0046] [Table 1]

[0047] [Table 2]

[0048] As shown in Table 1, all of the skin cleanser compositions of Examples 1 to 14 had excellent cleansing power against pore dirt and a smooth feeling when rinsing, and there was no difference in the feel when used regardless of the presence or absence of moisture on the skin or makeup cosmetics, and they were able to improve the penetration of lotion.

[0049] In contrast, as shown in Table 2, the skin cleanser compositions of Comparative Examples 1 to 5 did not provide sufficient performance. The skin cleanser composition of Comparative Example 1 did not contain component (B), and therefore did not provide a smooth feeling upon rinsing, and the penetration of lotion was poor, resulting in a large difference in the feel upon use. The skin cleanser compositions of Comparative Examples 2 and 3 did not contain component (C), and therefore had low cleansing power against pore stains and provided an insufficient smooth feeling upon rinsing. The skin cleanser composition of Comparative Example 4 did not contain component (D), and therefore the smooth feeling upon rinsing was insufficient, resulting in a large difference in the feel upon use. The skin cleanser composition of Comparative Example 5 did not contain component (E), and therefore had low cleansing power against pore stains and poor penetration of lotion.

[0050] Example 15 The following essential components and other additive components were mixed to the following contents to prepare skin cleanser compositions (total content of each component: 100% by mass), and evaluations were carried out in the same manner as in the above examples. In Example 15, "Carbopol 941" manufactured by Lubrizol Japan Co., Ltd. was used as the carboxyvinyl polymer, and "Carbopol ETD2020" manufactured by Lubrizol Japan Co., Ltd. was used as the alkyl-modified carboxyvinyl polymer. The pH of the obtained skin cleanser composition was 5.5.

[0051] (Essential ingredient) (A) Polyoxyethylene (7 moles) coconut oil fatty acid glyceryl 24% by mass (B) Polyoxyethylene (7 moles) glycerin 6% by mass (C) 1,3 butanediol 4% by mass (C) Dipropylene glycol 4% by mass (C) 1,5-pentanediol 2% by mass (D) Carboxyvinyl polymer 0.2% by mass (D) Alkyl-modified carboxyvinyl polymer 0.2% by mass (E) 2-phenoxyethanol 0.3% by mass Water 40.7% by mass

[0052] (Other added ingredients) Glycerin 2% by mass Olive oil 2% by mass Ethyl oleate 2% by mass Isononyl isononanoate 2% by mass Ethylhexyl palmitate 2% by mass Cyclopentasiloxane 2% by mass Hydrogenated polyisobutene 6% by mass Arginine 0.1% by mass Potassium hydroxide 0.1% by mass Tocopherol 0.1% by mass Fragrance 0.1% by mass Ethylhexylglycerin 0.1% by mass Polyquaternium-51 0.1% by mass

[0053] The skin cleanser composition of Example 15 had excellent cleansing power against pore dirt and a smooth feeling when rinsing, and there was no difference in the feel when used regardless of the presence or absence of moisture on the skin or makeup cosmetics, and it was able to improve the penetration of lotion. [Industrial Applicability]

[0054] The skin cleanser composition of the present invention is useful, for example, as a cleansing cosmetic.

Claims

[Claim 1] The following components (A) to (E): (A) polyoxyethylene monofatty acid glyceryl with a content of 5 to 40 mass%; (B) polyoxyethylene glycerin at a content of 1 to 10% by mass, (C) a dihydric alcohol having 3 to 6 carbon atoms in an amount of 2 to 20% by mass, (D) an acrylic acid-based thickening polymer in a content of 0.02 to 0.6% by mass, and (E) 2-phenoxyethanol in a content of 0.02 to 0.6% by mass, and a skin cleansing composition containing water.

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