Skin cosmetics

Abstract

This skin cosmetic offers superior comfort upon application, and when used as a wipe-off cosmetic, it has the effect of minimizing the appearance of pores when used to wipe the face, and can suppress redness of the skin after wearing a mask. [Solution] A skin cosmetic containing (A) 10% to 99% by mass of natural water with a hardness of 10 mg / L to 200 mg / L, (B) 0.5% to 25% by mass of a dihydric alcohol having 3 to 6 carbon atoms, (C) 0.01% to 2% by mass of one or more organic acids and their salts selected from the group having a molecular weight of 70 to 500, and (D) 0.00001% to 0.01% by mass of benzalkonium chloride.

Description

Technical Field

[0001] The present invention relates to a skin cosmetic used for moisturizing the skin such as the face and body.

Background Art

[0002] The water generally used in skin cosmetics is mainly tap water collected from rivers and the like and purified, and is ion-exchanged water from which impurities such as metal ions have been removed with an ion-exchange resin. Among the components removed by the ion-exchange resin, there may be mineral salts that constitute natural moisturizing factors (NMF: natural moisturizing factor) together with amino acids and organic acids, such as calcium ions and magnesium ions. NMF plays an important role in maintaining healthy skin, and it is known that when the amount of NMF contained in the stratum corneum decreases, the moisturizing function deteriorates and the skin tends to become dry. It is generally widely recognized that mineral salts, which are components of NMF such as calcium ions and magnesium ions, are effective for skin moisturization.

[0003] However, when a mineral salt (especially a divalent or higher mineral salt) is blended into an aqueous skin cosmetic, due to its chelating action, substances dissolved in water may be combined with each other to generate a water-insoluble substance. Therefore, when natural water rich in mineral salts is used in skin cosmetics, the mineral salts contained in the natural water may cause the generation of water-insoluble substances. The water-insoluble substances generated in the skin cosmetic not only deteriorate the appearance due to precipitation or the like, but may also cause roughness during application and impair the comfort during application.

[0004] Regarding skin cosmetics, in order to obtain a good feeling during application, it is necessary to reduce irritation (stinging) such as a scratching feeling, a squeaking feeling, itching, and a tingling feeling, in addition to the roughness during application described above. Furthermore, regarding skin cosmetics, the condition of the skin when applying them is also important in order to achieve a pleasant feeling during application. If there is inflammation of the skin, such as roughness, it will be difficult to feel a pleasant sensation during application, and this feeling is especially likely to decrease if there is acne on the skin. Therefore, in order to achieve a pleasant feeling during application, it is important to prevent acne on the skin to which the skin cosmetic is applied.

[0005] Antibacterial ingredients such as benzalkonium chloride are widely used in cosmetics to prevent acne. However, increasing the amount of antibacterial ingredients to achieve an effective antibacterial effect can sometimes cause stinging. Therefore, there is a need for cosmetics in which antibacterial ingredients can exert an antibacterial effect even at low concentrations. To enhance the antibacterial effect of antibacterial ingredients and reduce skin irritation, cosmetics containing a combination of deep-sea water and a disinfectant have been disclosed (Patent Document 1). However, it has been reported that the antibacterial activity of cationic surfactants such as benzalkonium chloride decreases due to the presence of calcium ions, magnesium ions, etc., contained in deep-sea water and natural water (Non-Patent Literature 1).

[0006] On the other hand, there is a growing demand for multi-functional cosmetics. For example, all-in-one cosmetics that combine the functions of lotion, serum, and emulsion have been developed. In addition, to shorten the time required for skincare, wipe-off skin cosmetics have been developed that can remove dirt and moisturize simultaneously when applied with cotton pads, but achieving both minimizing the appearance of pores after wiping and being low on the skin has not been easy. For example, Patent Document 2 describes a wipe-off lotion that has excellent sebum removal effect, provides moisturizing effect without stickiness, and has a cheek lifting effect, using a specific polyoxyal A cleansing lotion containing chylene methyl glucoside, ethanol, and grape fruit extract has been disclosed. However, because the cleansing lotion described in Patent Document 2 contains ethanol, users with sensitive skin may experience skin irritation. Furthermore, Patent Document 3 discloses a cosmetic composition that contains a keratin-dissolving agent such as an organic salt such as citrate, which is excellent in dissolving keratin plugs. However, when organic acid salts were added to cosmetics containing deep-sea water or natural water, the mineral salts such as calcium salts and magnesium salts contained in the deep-sea water or natural water caused the organic acid salts to precipitate, which sometimes worsened the appearance of the cosmetic and reduced the pleasant feeling when applied. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 10-182346 [Patent Document 2] Japanese Patent Publication No. 2019-182804 [Patent Document 3] Japanese Patent Publication No. 2004-075575 [Non-patent literature]

[0008] [Non-Patent Document 1] Disinfectants affected by dilution with tap water, Fukuoka Prefectural Pharmacists Association; https: / / www.fpa.or.jp / johocenter / yakuji-main / shodokuyaku / suidousuiniyorukishaku.html [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] Furthermore, in recent years, the COVID-19 pandemic has led to an increase in opportunities to wear masks. When wearing a mask, friction occurs between the mask and the skin, and the area covered by the mask becomes hot and humid, causing the skin to become damp and prone to redness after wearing a mask. Therefore, there is a need for a skin cosmetic that is comfortable to apply, minimizes the appearance of pores when used as a wipe-off cosmetic, and can suppress redness of the skin after wearing a mask. However, the reality is that skin cosmetics like those described above have not yet been developed. Therefore, the object of the present invention is to provide a skin cosmetic that is pleasant to apply, has the effect of making pores less noticeable when used as a wipe-off cosmetic to wipe the face, and can suppress redness of the skin after wearing a mask. [Means for solving the problem]

[0010] To solve the above problems, the present inventors conducted diligent research and found that by adding predetermined amounts of natural water having a predetermined hardness and a dihydric alcohol having 3 to 6 carbon atoms to a skin cosmetic composition containing predetermined amounts of one or more organic acids and their salts with a molecular weight of 70 to 500, as well as benzalkonium chloride, the cosmetic composition provides excellent comfort when applied, has the effect of minimizing the appearance of pores when used as a wipe-off cosmetic to wipe the face, and can suppress redness of the skin after wearing a mask. Further research led to the completion of the present invention.

[0011] In other words, the present invention relates to the following: [1] (A) Natural water with a hardness of 10 mg / L or more and 200 mg / L or less, 10% by mass or more and 99% by mass or less, (B) Dihydric alcohol with 3 to 6 carbon atoms in an amount of 0.5% to 25% by mass, (C) One or more organic acids selected from the group consisting of organic acids and their salts having a molecular weight of 70 or more and 500 or less, in an amount of 0.01% to 2% by mass, and (D) A skin cosmetic containing 0.00001% by mass or more and 0.01% by mass or less of benzalkonium chloride. [2] The skin cosmetic according to [1], further containing 0.01% by mass or more and 0.5% by mass or less of (E) glycerin mono-2-ethylhexyl ether. [3] The skin cosmetic according to [1] or [2], further containing (F) ceramide in an amount of 0.00001% by mass or more and 0.01% by mass or less. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a skin cosmetic that offers excellent comfort during application, has the effect of minimizing the appearance of pores when used as a wipe-off cosmetic to wipe the face, and can suppress redness of the skin after wearing a mask. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below. The present invention relates to a skin cosmetic containing (A) natural water with a hardness of 10 mg / L or more and 200 mg / L or less, (B) a dihydric alcohol having 3 to 6 carbon atoms, (C) one or more organic acids and their salts with a molecular weight of 70 or more and 500 or less, and (D) benzalkonium chloride (hereinafter also referred to as "the skin cosmetic of the present invention").

[0014] In the present invention, "skin cosmetic" refers to a cosmetic applied to the skin directly or indirectly by application or spraying, and specifically includes basic cosmetics such as lotions, emulsions, and creams; base cosmetics such as primer lotions and primer creams; finishing (makeup) cosmetics such as foundations; fragrance cosmetics such as perfumes and hair colognes; anti-wrinkle cosmetics; and medicated cosmetics (quasi-drugs) such as whitening cosmetics. Among these, basic cosmetics and medicated cosmetics that keep the skin clean and healthy are preferred as skin cosmetics. In this specification, numerical ranges defined using the symbol "~" include the numbers at both ends (upper and lower limits) of "~". For example, "2~5" means 2 or more and 5 or less.

[0015] <(A) Natural water with a hardness of 10 mg / L or more and 200 mg / L or less> In the skin cosmetic of the present invention, the natural water contained as component (A) is natural water having a hardness calculated from the content concentrations of calcium salts and magnesium salts of 10 mg / L or more and 200 mg / L or less. The natural water is not particularly limited as long as it has a hardness within the above range. For example, shallow well water, deep well water, spring water, mineral water, hot spring water, underground running water, mineral water, etc. described in "Types of Main Raw Waters" of the Food Distribution Bureau Director's Notice No. 1071 dated March 30, 1990. Any one of these natural waters may be used alone, or two or more may be selected and used in combination. Also, these natural waters may be used as they are after being collected, or those that have been subjected to filtration sterilization, heat sterilization, ozone sterilization, ultraviolet sterilization, etc. after collection may be used. In the present invention, the hardness of the natural water is the amount of calcium and magnesium converted to the amount of calcium carbonate (CaCO3), expressed in the unit of [mg / L], and can be calculated using the following simple formula (1) (atomic weights: Ca = 40.1, Mg = 24.3, molecular weight: CaCO3 = 100.1).

[0016]

Number

[0017] In the natural water contained as component (A) in the skin cosmetic of the present invention, the hardness calculated using the above formula (1) is 10 mg / L or more and 200 mg / L or less, preferably 15 mg / L or more and 150 mg / L or less, more preferably 20 mg / L or more and 100 mg / L or less, and even more preferably 20 mg / L or more and 40 mg / L or less. When the above hardness is less than 10 mg / L or exceeds 200 mg / L, there may be cases where the comfort during application is insufficient or the effect of suppressing redness of the skin after wearing a mask is insufficient. There may be cases where the comfort during application is insufficient or the effect of suppressing redness of the skin after wearing a mask is insufficient.

[0018] In the present invention, as component (A), natural water having the above-mentioned hardness may be collected and used as is, or after collection, filtered and sterilized, heat-sterilized, ozone-sterilized, ultraviolet-sterilized, etc. Commercially available products of natural water having the above-mentioned hardness provided by various companies for cosmetic use may also be used.

[0019] The content of component (A) relative to the total amount of the skin cosmetic composition of the present invention is 10% by mass or more and 99% by mass or less. If the content of component (A) is less than 10% by mass, the comfort during application may be insufficient, or the effect of suppressing skin redness after wearing a mask may be insufficient. The content of component (A) relative to the total amount of the skin cosmetic composition of the present invention is preferably 20% by mass or more, and more preferably 30% by mass or more. On the other hand, if the content of component (A) exceeds 99% by mass, the effect commensurate with the amount used may not be obtained. The content of component (A) relative to the total amount of the skin cosmetic composition of the present invention is preferably 98.5% by mass or less, and more preferably 98% by mass or less. In one embodiment of the present invention, the content of component (A) relative to the total amount of the skin cosmetic composition of the present invention is preferably 20% by mass or more and 98.5% by mass or less, and more preferably 30% by mass or more and 98% by mass or less.

[0020] <(B) Dihydric alcohols with 3 to 6 carbon atoms> In the skin cosmetic composition of the present invention, the dihydric alcohol having 3 to 6 carbon atoms contained as component (B) is not particularly limited as long as it is an alcohol having 3 to 6 carbon atoms and two hydroxyl groups in the molecule that can be used on the skin as a cosmetic component. Examples include 1,2-propanediol (propylene glycol), 1,3-propanediol, 1,2-butanediol, 1,3-butanediol (1,3-butylene glycol), 1,4-butanediol, 2,3-butanediol, 1,2-pentanediol (pentylene glycol), 1,5-pentanediol, 1,2-hexanediol, dipropylene glycol, etc. For the purposes of the present invention, 1,3-propanediol, 1,3-butanediol, and 1,2-pentanediol are preferably used, and 1,2-pentanediol is more preferably used. As component (B), one dihydric alcohol having 3 to 6 carbon atoms may be selected and used alone, or two or more may be selected and used in combination.

[0021] In the present invention, as component (B), commercially available products provided by various companies as the above-mentioned dihydric alcohol for cosmetic use can be used.

[0022] The content of component (B) relative to the total amount of the skin cosmetic composition of the present invention is 0.5% by mass or more and 25% by mass or less. If the content of component (B) is less than 0.5% by mass, the pleasant feeling upon application may be insufficient, or the effect of minimizing the appearance of pores when used as a wipe-off cosmetic on the face may be reduced. The content of component (B) relative to the total amount of the skin cosmetic of the present invention is preferably 1% by mass or more, and more preferably 1.5% by mass or more. On the other hand, if the content of component (B) exceeds 25% by mass, the comfort during application may be insufficient, or the effect of suppressing skin redness after wearing a mask may be insufficient. The content of component (B) relative to the total amount of the skin cosmetic composition of the present invention is preferably 22% by mass or less, and more preferably 18% by mass or less. In one embodiment of the present invention, the content of component (B) relative to the total amount of the skin cosmetic composition of the present invention is preferably 1% by mass or more and 22% by mass or less, and preferably 1.5% by mass or more and 18% by mass or less. It is preferable to have a certain state.

[0023] <(C) One or more organic acids and their salts with a molecular weight of 70 to 500> In the skin cosmetic composition of the present invention, the organic acid contained as component (C) is an acidic organic compound having a molecular weight of 70 to 500 and not having a basic functional group such as an amino group in its molecule. For the purposes of the present invention, the molecular weight of the organic acid is preferably 80 to 400, and more preferably 90 to 300. Component (C) is not particularly limited as long as it is an organic compound that has a pore-improving effect, such as making pores less noticeable, and can be included in skin cosmetics. Examples include carboxylic acids having the aforementioned improving effect, and preferred organic acids include 2-hydroxy acids having exfoliating and astringent effects, such as glycolic acid, lactic acid, malic acid, tartaric acid, and citric acid. Salts of these organic acids can also be used, and examples of such salts include alkali metal salts such as sodium salts and potassium salts; and alkanolamine salts such as triethanolamine salts. The skin cosmetic composition of the present invention may use one of the above-mentioned organic acids and its salts alone, or two or more may be selected and used in combination. Furthermore, when using the product as a cleansing cosmetic, citric acid and sodium citrate are particularly preferred in terms of their effect of minimizing the appearance of pores when used to wipe the face.

[0024] In the present invention, as component (C), commercially available products provided by various companies as organic acids or salts thereof for cosmetic use can be used.

[0025] The content of component (C) relative to the total amount of the skin cosmetic composition of the present invention is 0.01% by mass or more and 2% by mass or less. If the content of component (C) is less than 0.01% by mass, the pleasant feeling upon application may be insufficient, or the effect of minimizing the appearance of pores when used as a wipe-off cosmetic on the face may be reduced. The content of component (C) relative to the total amount of the skin cosmetic of the present invention is preferably 0.03% by mass or more, and more preferably 0.05% by mass or more. On the other hand, if the content of component (C) exceeds 2% by mass, the comfort during application may be insufficient, or the effect of suppressing skin redness after wearing a mask may be insufficient. The content of component (C) relative to the total amount of the skin cosmetic of the present invention is preferably 1.6% by mass or less, and more preferably 1.2% by mass or less. In one embodiment of the present invention, the content of component (C) relative to the total amount of the skin cosmetic is preferably 0.03% by mass or more and 1.6% by mass or less, and more preferably 0.05% by mass or more and 1.2% by mass or less.

[0026] <(D) Benzalkonium chloride> In the skin cosmetic composition of the present invention, benzalkonium chloride, or alkyldimethylbenzylammonium chloride, contained as component (D) is a cationic surfactant having antibacterial activity, and commercially available products for use in skin cosmetics can be used.

[0027] The content of component (D) relative to the total amount of the skin cosmetic composition of the present invention is 0.00001% by mass or more and 0.01% by mass or less. If the content of component (D) is less than 0.00001% by mass, the effect of minimizing the appearance of pores when used as a wipe-off cosmetic on the face may be reduced, or the effect of suppressing redness of the skin after wearing a mask may be insufficient. The content of component (D) relative to the total amount of the skin cosmetic of the present invention is preferably 0.00005% by mass or more, and 0.0 It is more preferable that the amount is 0.01% by mass or more. On the other hand, if the content of component (D) exceeds 0.01% by mass, the comfort during application may be insufficient, or the effect of suppressing skin redness after wearing a mask may be insufficient. The content of component (D) relative to the total amount of the skin cosmetic composition of the present invention is preferably 0.008% by mass or less, and more preferably 0.006% by mass or less. In one embodiment of the present invention, the content of component (D) relative to the total amount of the skin cosmetic is preferably 0.00005% by mass or more and 0.008% by mass or less, and more preferably 0.0001% by mass or more and 0.006% by mass or less.

[0028] <Content ratio of ingredients (A), (C), and (D)> From the viewpoint of improving the comfort of application, the ratio of the content of component (A) to the content of component (C) [(A) / (C)] is preferably 200 to 2000 by mass, more preferably 300 to 1500, and even more preferably 500 to 1000. Furthermore, from the viewpoint of improving the effect of minimizing the appearance of pores when used as a wipe-off cosmetic, the ratio of the content of ingredient (C) to the content of ingredient (D) [(C) / (D)] is preferably 20 to 400 by mass, more preferably 30 to 300, and even more preferably 50 to 250.

[0029] <(E) Glycerin mono-2-ethylhexyl ether> In addition to the above-mentioned components (A) to (D), the skin cosmetic composition of the present invention may further contain (E) glycerin mono-2-ethylhexyl ether. The glycerin mono-2-ethylhexyl ether that may be included as component (E) in the skin cosmetic composition of the present invention is a monoether of 2-ethylhexanol and glycerin, has antibacterial activity, and is used as a preservative aid. In this invention, commercially available products provided for cosmetic use can be used.

[0030] The content of component (E) relative to the total amount of the skin cosmetic composition of the present invention is preferably 0.01% by mass or more and 0.5% by mass or less, more preferably 0.03% by mass or more and 0.45% by mass or less, and even more preferably 0.05% by mass or more and 0.4% by mass or less. When the content of ingredient (E) is within the above range, the effect of minimizing the appearance of pores when used as a wipe-off cosmetic to cleanse the face, and the effect of suppressing redness of the skin after wearing a mask are further improved.

[0031] <(F) Ceramide> The skin cosmetic composition of the present invention may further contain (F) ceramide in addition to the above-mentioned components (A) to (D) or components (A) to (E). The ceramide that may be included as component (F) in the skin cosmetic of the present invention is a neutral lipid molecule having a structure in which a sphingoid base and a long-chain fatty acid are linked by an amide bond, and is known to be involved in the skin's barrier function as an intercellular lipid in the stratum corneum of the skin. The ceramides present in the human stratum corneum are classified into 20 types, each composed of five types of sphingoid bases: dihydrosphingosine (DS), sphingosine (S), phytosphingosine (P), 6-hydroxysphingosine (H), and 4,14-sphingadiene (SD), and four types of fatty acids: non-hydroxy fatty acid (N), α-hydroxy fatty acid (A), ω-hydroxy fatty acid (O), and esterified ω-hydroxy fatty acid (EO). Each type of ceramide is expressed using abbreviations of the fatty acid and sphingoid base that constitute it. Regarding ceramides, as mentioned above, there is a mix of classification notations: one using symbols to indicate the fatty acids and sphingoid bases that make up ceramides, and the older classification notation using numbers to indicate function and origin. However, the ceramide used in this invention is not limited by that notation. Furthermore, in the present invention, as the ceramide, either optical isomers of each ceramide, or a mixture containing isomers that may exist in each ceramide in any mixing ratio, can be used. The skin cosmetic composition of the present invention can be used by selecting one ceramide from the above-mentioned ceramides and using it alone, or by selecting two or more ceramides and using them in combination. For the purposes of the present invention, ceramide AP (an N-acylated sphingolipid in which an α-hydroxy saturated fatty acid or an α-hydroxy unsaturated fatty acid is amide-bonded to the amino group of phytosphingosine), ceramide EOP (an N-acylated sphingolipid in which an esterified ω-hydroxy saturated fatty acid or an esterified ω-hydroxy unsaturated fatty acid is amide-bonded to the amino group of phytosphingosine), ceramide NP (an N-acylated sphingolipid in which a saturated fatty acid or an unsaturated fatty acid is amide-bonded to the amino group of phytosphingosine), and ceramide NG (ceramide NDS) (an N-acylated sphingolipid in which a saturated fatty acid or an unsaturated fatty acid is amide-bonded to the amino group of dihydrosphingosine (sphinganine)) are preferably used, ceramide NP and ceramide NG are more preferably used, and ceramide NP is even more preferably used.

[0032] In the present invention, component (F) may be ceramide extracted from animals, plants, or microorganisms, isolated and purified, or ceramide produced by known synthesis methods, and commercially available products from various companies can also be used.

[0033] The content of component (F) relative to the total amount of the skin cosmetic of the present invention is preferably 0.00001% by mass or more and 0.01% by mass or less, more preferably 0.00005% by mass or more and 0.005% by mass or less, and even more preferably 0.0001% by mass or more and 0.001% by mass or less. When the content of component (F) is within the above range, the comfort during application and the effect of suppressing skin redness after wearing a mask are further improved.

[0034] <Water other than ingredient (A)> The skin cosmetic composition of the present invention may contain ordinary water in addition to component (A). "Ordinary water" refers to ion-exchanged water or distilled water commonly used in skin cosmetics, which are substantially free of minerals and have a hardness of 0 mg / L or less than 1 mg / L. The water content in the skin cosmetic of the present invention is typically set as an amount that is 100% by mass of the total amount of the skin cosmetic, but is preferably 60% by mass or less, more preferably 40% by mass or less, and even more preferably 20% by mass or less.

[0035] <Other additives> In addition to the above components (A) to (F) and water other than component (A), the skin cosmetic composition of the present invention may further contain general additives used in skin cosmetics, to the extent that they do not impair the characteristics of the present invention. Other additives include, for example, humectants ((B) polyhydric alcohols excluding dihydric alcohols with 3 to 6 carbon atoms (glycerin, diglycerin, etc.), amino acids (glycine, alanine, serine, arginine, etc.), mucopolysaccharides (sodium hyaluronate, chondroitin sulfate, etc.)); anti-inflammatory agents (licorice extract, dipotassium glycyrrhizate, etc.); anti-aging agents (nicotinamide, etc.); whitening agents (ascorbic acid derivatives (magnesium ascorbic acid phosphate, ascorbic acid 2-glucoside, etc.)); oils (animal and vegetable oils and fats, hydrocarbon oils, ester oils, aliphatic alcohols, etc.); surfactants (polyoxyethylene sorbitan fatty acid esters (polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, etc.), polyoxyethylene fatty acid esters (polyoxyethylene glycol monostearate, etc.), glycerin mo (e.g., fatty acid esters (glyceryl monostearate, etc.)); preservatives (methyl parahydroxybenzoate, phenoxyethanol, etc.); thickeners (polysaccharides (xanthan gum, guar gum, etc.), acrylic acid polymers (carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, etc.)); pH adjusters (acidic substances that do not fall under organic acids and their salts, with a molecular weight of 70 to 500 contained as component (C) (for example, inorganic acids and their salts (phosphoric acid, sodium phosphate, etc.)), inorganic bases (sodium hydroxide) Examples include: organic bases (such as triethanolamine), antioxidants (organic acids and their salts that are not included as component (C) and have a molecular weight of 70 to 500 (such as sodium pyrosulfite and tocopherol)), chelating agents (organic acids and their salts that are not included as component (C) and have a molecular weight of 70 to 500 (such as sodium metaphosphate, sodium hexametaphosphate, and tetrasodium 1-hydroxyethane-1,1-diphosphonate)), fragrances, dyes, and pigments. Components (A) to (F) and other components that may be contained in addition to water other than component (A) may be used individually or in combination of two or more, depending on the purpose of each component's formulation. The content of the above-mentioned other additives relative to the total amount of the skin cosmetic composition of the present invention can be appropriately set according to the intended use of each additive, but it is preferably 40% by mass or less, and more preferably 30% by mass or less.

[0036] The skin cosmetic of the present invention can be provided in liquid, gel, emulsion, or cream form, or in the form of a nonwoven fabric sheet impregnated with a liquid, gel, or emulsion cosmetic, and can be used on the face, hands, body, etc. as a skin cosmetic such as a lotion, serum, emulsion, or cream; a base cosmetic such as a base lotion or base cream; a makeup cosmetic such as an emulsion foundation or cream foundation; a body cosmetic such as a body lotion or body cream; a medicated cosmetic such as a lotion, serum, emulsion, or cream for wrinkle prevention or whitening; or a wipe-off cosmetic, etc.

[0037] The skin cosmetic composition of the present invention can be manufactured in accordance with conventional formulation methods adopted depending on its form. For example, in the case of a liquid or gel-type skin cosmetic, (F) ceramide, which may be added as needed, is dissolved in (B) a dihydric alcohol having 3 to 6 carbon atoms, and together with (C) one or more organic acids and their salts having a molecular weight of 70 to 500, (D) benzalkonium chloride, and (E) glycerin mono-2-ethylhexyl ether and other common additives, these are added and mixed with water other than component (A) and (A) natural water, made homogeneous, and adjusted to an optimal pH as appropriate. Furthermore, for emulsion-type skin cosmetics, the oil phase can be prepared by mixing components (E) and (F), which may be added as needed, with other oil-soluble components, heating to approximately 75°C to 80°C to make it uniform, separately adding components (B) to (D) and other water-soluble components, which may be added as needed, to water other than component (A) and component (A), dissolving them, heating to approximately 75°C to 80°C to make it uniform, and then preparing the aqueous phase. The oil phase can then be gradually added to the aqueous phase, stirred and mixed to emulsify, and cooled to manufacture. It is preferable to add components with low thermal stability after emulsification and cooling.

[0038] The skin cosmetic of the present invention offers superior comfort upon application, and when used as a wipe-off cosmetic to wipe the face, it has the effect of minimizing the appearance of pores and can suppress redness of the skin after wearing a mask. [Examples]

[0039] The present invention will be described in more detail below with reference to examples and comparative examples.

[0040] [Examples 1-18, Comparative Examples 1-4] Skin cosmetics According to the formulations shown in Tables 1 and 2, component (F) in the table was dissolved in component (B), and together with components (C) to (E), it was added to deionized water and component (A) and mixed until homogeneous to prepare the skin cosmetics of Examples 1 to 18. In addition, according to the formulations shown in Table 3, components (B) to (D) in the table were added to deionized water and component (A) and mixed until homogeneous to prepare the skin cosmetics of Comparative Examples 1 to 4. In Tables 1 to 3, the values ​​in the columns corresponding to each component indicate the content (mass %) relative to the total amount of the skin cosmetic. Furthermore, (A) / (C) indicates the ratio (mass ratio) of the content of (A) natural water to the content of (C) one or more organic acids and their salts selected from the group consisting of organic acids and their salts with a molecular weight of 70 to 500. (C) / (D) indicates the ratio (mass ratio) of the content of (D) benzalkonium chloride (in terms of solid content) to the content of (C) one or more organic acids and their salts selected from the group consisting of organic acids and their salts with a molecular weight of 70 to 500. Furthermore, the following raw materials were used for Natural Water 1 (*1) to Natural Water (*3) in Tables 1-3. For other ingredients, commercially available products provided for cosmetic use were used. *1 Natural water 1; Mineral water with a hardness of 150 mg / L was used. *2 Natural water 2; Mineral water with a hardness of 50 mg / L was used. *3 Natural water 3; Mineral water with a hardness of 25 mg / L was used.

[0041] For each of the skin cosmetics in Examples 1-18 and Comparative Examples 1-4, the following evaluations were made regarding comfort during application, the degree to which pores were minimized when used as a wipe-off cosmetic by soaking a cotton pad and wiping the face, and the effect of suppressing skin redness after wearing a mask.

[0042] (1) Pleasant feeling when applied Twenty women aged 25 to 55 served as panelists. Each panelist took 1g of each skin cosmetic from the examples and comparative examples into their palm, applied it to their face, and evaluated the pleasant feeling based on the evaluation criteria below. <Evaluation Criteria> 2 points: If it feels very comfortable, without any roughness, squeaking, stickiness, or irritation. 1 point: If there is little to no roughness, squeaking, stickiness, or irritation, and it feels pleasant. 0 points: If you experience roughness, squeaking, stickiness, or irritation, and find it unpleasant.

[0043] (2) When used as a cleansing cosmetic, the product helps to minimize the appearance of pores when applied to a cotton pad and used to wipe the face. Twenty women aged 25 to 55 served as panelists. Each panelist applied 1g of each skin cosmetic from the examples and comparative examples to a cotton pad and wiped their face, evaluating the degree to which pores were less noticeable based on the following evaluation criteria. <Evaluation Criteria> 2 points: If you feel that your pores are less noticeable compared to before wiping. 1 point: If you feel that your pores are slightly less noticeable compared to before wiping. 0 points: If you feel that your pores are just as noticeable as before wiping.

[0044] (3) Suppression of skin redness after wearing a mask Twenty women aged 25 to 55 served as panelists. Each panelist took 1g of each skin cosmetic from the examples and comparative examples into their palm, applied it to their face, and then wore a mask for 2 hours. After that, they evaluated the redness of their skin based on the evaluation criteria below. <Evaluation Criteria> 2. If you feel that the redness of your skin has not changed compared to before wearing the mask. 1. If you feel that the redness of your skin has not changed much compared to before wearing the mask. 0 points: If you feel that your skin has become redder compared to before wearing the mask.

[0045] In the evaluations described in (1) to (3) above, the total scores of the 20 panelists were calculated and judged according to the following criteria, as shown in Tables 1 to 3. A rating of "◎" or "○" was considered a pass. <Judgment criteria> ◎: Total score of 35 points or higher ○: Total score of 30 points or more, and 34 points or less. △: Total score is between 20 and 29 points. ×: Total score of 19 points or less

[0046] [Table 1]

[0047] [Table 2]

[0048] [Table 3]

[0049] As shown in Tables 1 and 2, the skin cosmetics of Examples 1 to 18 were judged as "◎" or "〇" and passed the test in terms of comfort during application, minimization of pore visibility after wiping the face, and suppression of skin redness after wearing a mask. In particular, it contains 80% by mass of natural water 3 (mineral water with a hardness of 25 mg / L) as component (A), 2% by mass of 1,2-pentanediol as component (B), 0.05% by mass each of citric acid and sodium citrate as component (C), and 0.001% by mass of component (D), with the ratio of the content of component (A) to the content of component (C) [(A) / (C)] being 800 by mass, and the ratio of the content of component (C) to the content of component (D) [(C In the skin cosmetic of Example 13, in which the mass ratio of ) / (D) is 100, in the skin cosmetic of Example 16, which further contains 0.2% by mass of component (E), in the skin cosmetic of Example 17, which further contains 0.001% by mass of ceramide NP as component (F), and in the skin cosmetic of Example 18, which further contains 0.2% by mass of component (E) and 0.001% by mass of ceramide NP as component (F), all evaluation items were judged as "◎".

[0050] In contrast, as shown in Table 3, none of the skin cosmetics in Comparative Examples 1 to 4 received a passing grade ("◎" or "〇") in any of the evaluation items. Specifically, in Comparative Example 1, which does not contain ingredient (A), the comfort during application and the effect of suppressing skin redness after wearing a mask were judged to be insufficient. In Comparative Example 2, which does not contain ingredient (B), and in Comparative Example 3, which does not contain ingredient (C), the comfort during application and the reduction in the visibility of pores after wiping the face were judged to be insufficient. In Comparative Example 4, which does not contain ingredient (D), the reduction in the visibility of pores after wiping the face and the effect of suppressing skin redness after wearing a mask were judged to be insufficient.

[0051] Next, examples of formulations of the skin cosmetic of the present invention (Formulation Examples 1 and 2) are shown. These formulations of skin cosmetic were also excellent in all aspects, including comfort upon application, minimization of pore visibility after wiping the face, and suppression of skin redness after wearing a mask.

[0052] [Example of prescription 1] Gel-type skin cosmetic A gel-type skin cosmetic was prepared as follows, according to the formulation shown in Table 4. <Preparation method> Ingredient (F) in Table 4 was dissolved in ingredient (B), and ingredients (C) to (E) and other ingredients (except arginine) were added to deionized water and ingredient (A) and mixed until homogenized. Then, arginine dissolved in a portion of the deionized water was added to thicken the mixture.

[0053] [Table 4]

[0054] [Prescription Example 2] Emulsion-type skin cosmetic A lotion-type skin cosmetic was prepared as follows, according to the formulation shown in Table 5. <Preparation method> Components (E) and (F) were mixed with oil-soluble components other than fragrance (glyceryl monostearate, behenyl alcohol, olive fruit oil, cetyl 2-ethylhexanoate, tocopherol), heated to 75°C to 80°C to homogenize and form an oil phase. B) to (D), and other water-soluble components other than ascorbic acid 2-glucoside, dipotassium glycyrrhizate, sodium hyaluronate, and arginine, were added to deionized water and component (A) and dissolved, and heated to 75°C to 80°C to form an aqueous phase. The oil phase was gradually added to the aqueous phase while stirring and mixed to emulsify. After cooling to 40°C, the other components ascorbic acid 2-glucoside, dipotassium glycyrrhizate, sodium hyaluronate, and fragrance were added and mixed uniformly, and then arginine dissolved in a portion of the deionized water was added to thicken the mixture.

[0055] [Table 5] [Industrial applicability]

[0056] As described in detail above, the present invention provides a skin cosmetic that offers excellent comfort during application, has the effect of minimizing the appearance of pores when used as a wipe-off cosmetic to wipe the face, and can suppress redness of the skin after wearing a mask.

Claims

1. (A) Natural water with a hardness of 10 mg / L or more and 200 mg / L or less, 10% by mass or more and 99% by mass or less. (B) Dihydric alcohol with 3 to 6 carbon atoms in an amount of 0.5% by mass or more and 25% by mass or less, (C) One or more organic acids selected from the group consisting of organic acids and their salts having a molecular weight of 70 or more and 500 or less, in an amount of 0.01% to 2% by mass, and (D) A skin cosmetic containing 0.00001% by mass or more and 0.01% by mass or less of benzalkonium chloride, wherein the ratio of the content of component (C) to the content of component (D) [(C) / (D)] is 20 to 400 by mass.

2. The skin cosmetic composition according to claim 1, further containing (E) glycerin mono-2-ethylhexyl ether in an amount of 0.01% by mass or more and 0.5% by mass or less.

3. The skin cosmetic composition according to claim 1 or 2, further containing (F) ceramide in an amount of 0.00001% by mass or more and 0.01% by mass or less.

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