Viscous skin cosmetic

Abstract

To provide a viscous skin cosmetic containing natural water, which resists dripping and collapse during application, offers excellent storage stability, and exhibits little difference in use feel due to temperature changes.SOLUTION: A viscous skin cosmetic comprises: (A) 10 mass% to 98 mass% of natural water having a hardness of 10 mg / L to 200 mg / L, (B) 0.05 mass% to 1.5 mass% of an acrylic acid-based thickening polymer, (C) 0.5 mass% to 25 mass% of a divalent alcohol having 3 to 6 carbon atoms, and (D) 0.001 mass% to 1.6 mass% of polyoxyethylene sorbitan fatty acid ester or alkyl polyglucoside.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a viscous skin cosmetic preparation suitable for moisturizing the skin of the face, body, etc. [Background technology]

[0002] Skin cosmetics containing moisturizers and oils are used to prevent the skin from drying out. When applying skin cosmetics to the skin, it is preferable that the skin cosmetics have viscosity because they are less likely to drip. Acrylic acid-based thickening polymers are used to impart viscosity to skin cosmetics. Viscous skin cosmetics using acrylic acid-based thickening polymers are not only less likely to drip when applied, but also have a feeling of crumbling as the viscosity gradually decreases during application, which is preferable because of their refreshing feel when used. However, when the salt concentration in the cosmetic is high, the acrylic acid-based thickening polymer may not be able to exhibit a sufficient thickening effect. Patent Document 1 discloses that salt resistance can be improved by blending cellulose fiber in addition to the acrylic acid-based thickening polymer. However, there are cases where the feeling of crumbling during application is insufficient. In addition, cosmetics containing acrylic acid-based thickening polymers may lose viscosity at high temperatures, resulting in poor storage stability. Patent Document 2 discloses an aqueous cosmetic that is excellent in storage stability at high temperatures by blending agar, xanthan gum, and an acrylic acid-based thickening polymer. However, if the salt concentration in the cosmetic is high, it may not be possible to achieve a sufficient thickening effect.

[0003] The water generally used in skin cosmetics is ion-exchanged water, which is made by removing impurities such as metal ions using ion-exchange resins, from tap water that has been collected from rivers and other sources and purified. The components removed by ion-exchange resins may include mineral salts such as calcium ions and magnesium ions that, together with amino acids and organic acids, constitute natural moisturizing factors (NMFs). NMFs play an important role in maintaining healthy skin, and it is known that a decrease in the amount of NMF in the stratum corneum reduces the skin's moisturizing function and makes the skin more susceptible to dryness. It is widely known that mineral salts, which are components of NMFs such as calcium ions and magnesium ions, are effective in moisturizing the skin. However, when mineral salts (especially divalent or higher mineral salts) are blended into an aqueous skin cosmetic, their chelating action may cause substances dissolved in water to bind together, resulting in the formation of water-insoluble substances. Therefore, when natural water rich in mineral salts is used in a viscous skin cosmetic containing an acrylic acid-based thickening polymer, the mineral salts contained in the natural water may cause the formation of water-insoluble substances. The water-insoluble substances generated in the skin cosmetic not only deteriorate the appearance due to precipitation, etc., but may also reduce the viscosity, thereby reducing the resistance to dripping when applied. The decrease in viscosity is particularly noticeable when stored at high temperatures, and viscous skin cosmetic stored at high temperatures may reduce the resistance to dripping when applied even when returned to room temperature.

[0004] On the other hand, cosmetics may be stored at various temperatures, ranging from low to high, depending on whether or not the indoor temperature is regulated in cold or tropical regions, and from the viewpoint of providing cosmetics of consistent quality, it is preferable that there is little difference in the feel when used, regardless of the storage temperature. However, a viscous skin cosmetic that contains natural water, does not drip easily when applied, has excellent storage stability at high temperatures, and exhibits little change in feel when used due to temperature changes has not yet been developed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-75471 [Patent Document 2] International Publication No. 2016 / 143663 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the object of the present invention is to provide a viscous skin cosmetic that contains natural water, is resistant to dripping and crumbling when applied, has excellent storage stability at high temperatures, and exhibits little change in feel when used (feel when using the cosmetic, comfort when used) due to temperature changes. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the present inventors have unexpectedly discovered that in a skin cosmetic preparation containing natural water having a specific hardness and an acrylic acid-based thickening polymer, by simply adding a dihydric alcohol having 3 to 6 carbon atoms and a polyoxyethylene sorbitan fatty acid ester or an alkyl polyglucoside, the preparation is less likely to drip when applied and has a feeling of crumbling, has improved storage stability at high temperatures, and reduces the difference in feel when used due to temperature changes. After further research, the present inventors have completed the present invention.

[0008] That is, the present invention relates to the following. [1] A viscous skin cosmetic preparation containing 10% by mass to 98% by mass of the following component (A), 0.05% by mass to 1.5% by mass of component (B), 0.5% by mass to 25% by mass of component (C), and 0.001% by mass to 1.6% by mass of component (D): (A) Natural water with a hardness of 10 mg / L to 200 mg / L; (B) an acrylic acid-based thickening polymer; (C) dihydric alcohols having 3 to 6 carbon atoms, and (D) Polyoxyethylene sorbitan fatty acid ester or alkyl polyglucoside. [2] The viscous skin cosmetic preparation according to [1], further comprising 0.01% by mass to 1% by mass of a thickening polysaccharide (E). [3] The viscous skin cosmetic preparation according to [1] or [2], further comprising (F) 0.0001% by mass to 0.05% by mass of an acidic mucopolysaccharide. Effect of the Invention

[0009] According to the present invention, it is possible to provide a viscous skin cosmetic which contains natural water, is resistant to dripping and has a feeling of crumbling when applied, has excellent storage stability at high temperatures, and shows little difference in feel when used due to temperature changes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described. The present invention relates to a viscous skin cosmetic preparation containing specific amounts of (A) natural water having a hardness of 10 mg / L to 200 mg / L, (B) an acrylic acid-based thickening polymer, (C) a dihydric alcohol having 3 to 6 carbon atoms, and (D) a polyoxyethylene sorbitan fatty acid ester or an alkyl polyglucoside (hereinafter also referred to as the viscous skin cosmetic preparation of the present invention).

[0011] In the present invention, the term "viscous skin cosmetic" refers to a viscous cosmetic that is applied directly or indirectly to the skin by spreading or spraying, i.e., a thick cosmetic. Specific examples of viscous skin cosmetic include basic cosmetics such as serums, gels, milky lotions, and creams, base cosmetics such as base gels and base creams, finishing (make-up) cosmetics such as foundations, fragrant cosmetics such as perfumes, anti-wrinkle cosmetics, and medicated cosmetics (quasi-drugs) such as whitening cosmetics. Among these, basic cosmetics and medicated cosmetics for keeping the skin clean and healthy are preferred as viscous skin cosmetic. In this specification, a numerical range defined using the symbol "~" is intended to include both the upper and lower limits of the range. For example, "2~5" means 2 or more and 5 or less.

[0012] <Component (A): Natural water with hardness of 10mg / L to 200mg / L> In the viscous skin cosmetic of the present invention, the natural water contained as component (A) is natural water having a hardness of 10 mg / L to 200 mg / L calculated from the concentrations of calcium salts and magnesium salts contained therein.

[0013] The natural water is not particularly limited as long as it has a hardness within the above range, and examples thereof include shallow well water, deep well water, spring water, mineral water, hot spring water, underground water, mineral water, etc., which are listed in the "Major Types of Raw Water" in the Notice of the Director-General of the Food Distribution Bureau No. 2 Food Distribution No. 1071 dated March 30, 1990. Any one of these natural waters may be used alone, or two or more types may be selected and used in combination. Furthermore, these natural waters may be used as they are after collection, or may be used after collection and subsequent filtration sterilization, heat sterilization, ozone sterilization, ultraviolet sterilization, etc.

[0014] In the present invention, the hardness of natural water is the calcium and magnesium content converted into the amount of calcium carbonate (CaCO3), expressed in [mg / L], and can be calculated using the following simplified formula (1) (atomic weights are Ca=40, Mg=24.3, and molecular weight is CaCO3=100).

[0015]

number

[0016] The natural water contained as component (A) in the viscous skin cosmetic of the present invention has a hardness calculated using the above formula (1) of 10 mg / L to 200 mg / L, preferably 15 mg / L to 150 mg / L, and more preferably 20 mg / L to 100 mg / L. If the hardness is less than 10 mg / L, the feeling of crumbling when applied may be insufficient, or the feeling of use may vary greatly depending on temperature changes, whereas if the hardness is more than 200 mg / L, the resistance to dripping when applied may be insufficient, or the storage stability may decrease when stored at high temperatures.

[0017] In the present invention, natural water having the above-mentioned hardness may be collected as component (A) and used as is or after collection, it may be subjected to filtration sterilization, heat sterilization, ozone sterilization, ultraviolet sterilization, etc., and commercially available products provided by various companies for use in cosmetics which are natural water having the above-mentioned hardness may also be used.

[0018] The content of component (A) relative to the total amount of the viscous skin cosmetic of the present invention is 10% by mass to 98% by mass, preferably 20% by mass to 95% by mass, and more preferably 30% by mass to 90% by mass. If the content of component (A) is less than 10% by mass, the feeling of crumbling when applied may be insufficient, or the difference in the feeling of use due to temperature changes may be large. On the other hand, if the content of component (A) is more than 98% by mass, the resistance to dripping when applied may be insufficient.

[0019] <Component (B): Acrylic acid-based thickening polymer> The viscous skin cosmetic of the present invention contains an acrylic acid-based thickening polymer as component (B). Here, the "acrylic acid-based thickening polymer" is a polymer that has structural units derived from acrylic acid and / or structural units derived from alkyl acrylate and has thickening properties.

[0020] Examples of acrylic acid-based thickening polymers include carboxyvinyl polymers, alkyl-modified carboxyvinyl polymers, and starch-sodium acrylate graft polymers. Here, the term "carboxyvinyl polymer" refers to a polymer having acrylic acid as the main chain, crosslinked with sucrose allyl ether, pentaerythritol allyl ether, or propylene allyl ether. The term "alkyl-modified carboxyvinyl polymer" refers to a copolymer of acrylic acid or methacrylic acid and alkyl acrylate, crosslinked with sucrose allyl ether, pentaerythritol allyl ether, or propylene allyl ether. The term "starch-sodium acrylate graft polymer" refers to starch that has been graft-polymerized with acrylic acid and a small amount of methylenebisacrylamide, and then partially neutralized with sodium hydroxide. Component (B) is preferably an alkyl-modified carboxyvinyl polymer and / or a starch-sodium acrylate graft polymer.

[0021] Examples of the alkyl group of the alkyl acrylate constituting the alkyl-modified carboxyvinyl polymer (that is, the alkyl group bonded to --CO--O) include linear or branched alkyl groups having 10 to 30 carbon atoms.

[0022] 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 having a concentration of 0.5% by mass and a pH adjusted to 5.5 by neutralization with a base (e.g., potassium hydroxide, arginine, etc.) 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 reducing the difference in the feeling of use depending on the usage situation. This viscosity can be measured by a Brookfield B-type viscometer.

[0023] Examples of commercially available carboxyvinyl polymers include "AQUPEC HV-505E" manufactured by Sumitomo Seika Chemicals Co., Ltd., "Carbopol Ultrez 10", "Carbopol 940", and "Carbopol 941" manufactured by Lubrizol Japan Co., Ltd., and "Syntharen K" and "Syntharen L" manufactured by 3V Sigma. Examples of commercially available alkyl-modified carboxyvinyl polymers include "AQUPEC HV-501ER" manufactured by Sumitomo Seika Chemicals Co., Ltd., "Carbopol 1342" and "Carbopol ETD2020" manufactured by Lubrizol Japan Co., Ltd., and the like. Examples of commercially available starch-sodium acrylate graft polymers include "Salandur ST-100SP", "Salandur ST-100Mc", and "Salandur 300" manufactured by Sanyo Chemical Industries, Ltd. As component (B), the above acrylic acid-based thickening polymers may be used alone or in combination of two or more. In the present invention, as component (B), the above-mentioned acrylic acid-based thickening polymer, which is a commercially available product for use in cosmetics provided by various companies, can be used.

[0024] The content of component (B) relative to the total amount of the viscous skin cosmetic of the present invention is 0.05% by mass to 1.5% by mass, preferably 0.08% by mass to 1.2% by mass, and more preferably 0.1% by mass to 1% by mass. If the content of component (B) is less than 0.05% by mass, the resistance to dripping or the feeling of crumbling when applied may be insufficient, storage stability at high temperatures may decrease, or the difference in the feeling of use due to temperature changes may be large. On the other hand, if the content of component (B) is more than 2% by mass, the feeling of crumbling when applied may be insufficient, or storage stability at high temperatures may decrease.

[0025] <Component (C): Dihydric alcohol with 3 to 6 carbon atoms> The dihydric alcohol having 3 to 6 carbon atoms contained as component (C) in the viscous skin cosmetic of the present invention is not particularly limited as long as it is an alcohol having 3 to 6 carbon atoms and having two hydroxyl groups in the molecule and can be used on the skin as a cosmetic component, but examples thereof 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 purpose of the present invention, 1,3-propanediol, 1,3-butanediol and 1,2-pentanediol are preferably used, and 1,3-propanediol and 1,3-butanediol are more preferably used. As the component (C), the dihydric alcohol having 3 to 6 carbon atoms may be used alone or in combination of two or more kinds. In the present invention, as the component (C), commercially available products provided by various companies as the above dihydric alcohols for cosmetic use can be used.

[0026] The content of component (C) relative to the total amount of the viscous skin cosmetic of the present invention is 0.5% by mass to 25% by mass, preferably 1% by mass to 22% by mass, and more preferably 2% by mass to 20% by mass. If the content of component (C) is less than 0.5% by mass, the feeling of crumbling when applied may be insufficient, the storage stability at high temperatures may decrease, or the difference in the feeling of use due to temperature changes may be large. On the other hand, if the content of component (C) is more than 25% by mass, the feeling of crumbling when applied may be insufficient, or the storage stability at high temperatures may decrease.

[0027] <Component (D): Polyoxyethylene sorbitan fatty acid ester or alkyl polyglucoside> The component (D) used in the present invention is a polyoxyethylene sorbitan fatty acid ester or an alkyl polyglucoside. The fatty acid forming the polyoxyethylene sorbitan fatty acid ester preferably has 12 to 18 carbon atoms and may be either saturated or unsaturated. The number of moles of ethylene oxide added in this ester is preferably 10 to 40, more preferably 15 to 30. The fatty acid ester is preferably a monoester. Examples of the polyoxyethylene sorbitan fatty acid ester include polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate (polysorbate 80), and are preferably polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate.

[0028] Alkyl polyglucosides are obtained by condensation of alcohol and glucose, and the number of carbon atoms of the alcohol is preferably 12 to 22, and it is preferably saturated. Examples include coconut oil alkyl glucoside, lauryl glucoside, myristyl glucoside, cetearyl glucoside, and arachidyl glucoside, and preferably cetearyl glucoside and arachidyl glucoside. As the component (D), one type may be used alone, or two or more types may be used in combination.

[0029] The content of component (D) relative to the total amount of the viscous skin cosmetic of the present invention is 0.001 to 1.6% by mass, preferably 0.005 to 1.4% by mass, and more preferably 0.01 to 1.2% by mass. If the content of component (D) is less than 0.001% by mass, the resistance to dripping when applied may be insufficient, storage stability at high temperatures may decrease, or the difference in feel when used due to temperature changes may be significant. On the other hand, if the content of component (D) is more than 1.6% by mass, the feeling of crumbling when applied may be insufficient.

[0030] <Content ratio of components (A) and (C)> In the viscous skin cosmetic of the present invention, from the viewpoints of improving the feeling of crumbling upon application and minimizing the difference in feeling upon use due to temperature changes, the ratio of the content of component (A) to the content of component (C) [(A) / (C)] is preferably 4 to 18 by mass, more preferably 5 to 15, and even more preferably 6 to 12.

[0031] <Component (E): Thickening polysaccharide> The viscous skin cosmetic of the present invention may further contain (E) a thickening polysaccharide in addition to the above components (A) to (D). Specific examples of the thickening polysaccharide include xanthan gum, gellan gum, tamarind seed gum, etc., and preferably xanthan gum and gellan gum. In the viscous skin cosmetic of the present invention, one type of thickening polysaccharide may be selected and used alone, or two or more types may be selected and used in combination.

[0032] The content of component (E) relative to the total amount of the viscous skin cosmetic of the present invention is preferably 0.01% by mass to 1% by mass, more preferably 0.05% by mass to 0.8% by mass, and even more preferably 0.1% by mass to 0.6% by mass. When the content of component (E) is within the above range, the cosmetic composition is less likely to drip when applied, and the difference in feel when used due to temperature changes is reduced.

[0033] <Component (F): Acidic mucopolysaccharides> The viscous skin cosmetic preparation of the present invention may further contain (F) an acidic mucopolysaccharide in addition to the above components (A) to (D) or the above components (A) to (E). The acidic mucopolysaccharide contained as component (F) in the viscous skin cosmetic of the present invention is a polysaccharide containing amino sugar, and is a polysaccharide having an acidic group such as a carboxyl group or a sulfate group, and can be used without any particular limitation as long as it can be used for cosmetics on the skin, and examples thereof include hyaluronic acid, chondroitin-4-sulfate, chondroitin-6-sulfate, dermatan sulfate, keratan sulfate, heparan sulfate, heparin, etc., and their salts and acetylated products can also be used. For the purpose of the present invention, hyaluronic acid, chondroitin-4-sulfate, chondroitin-6-sulfate, and their salts and acetylated products are preferred, hyaluronic acid, its salts and acetylated products are more preferred, and salts of hyaluronic acid are most preferably used.

[0034] In the present invention, the above-mentioned acid mucopolysaccharides are preferably those having a weight-average molecular weight, as measured by gel permeation chromatography (GPC), of 5,000 to 2,000,000, and more preferably those having a weight-average molecular weight of 8,000 to 1,800,000.

[0035] The salt of the acidic mucopolysaccharide is not particularly limited as long as it can be stably used in cosmetics and can be used on the skin, but inorganic salts can be used, and examples of the inorganic salt include alkali metal salts such as sodium salts and potassium salts. The salt of the acidic mucopolysaccharide is preferably sodium salts or potassium salts. In the viscous skin cosmetic composition of the present invention, as component (F), one type may be selected from the group consisting of acid mucopolysaccharides, their salts, and their acetylated products and used alone, or two or more types may be selected and used in combination.

[0036] In the present invention, as the component (F), commercially available products provided by various companies as acid mucopolysaccharides for cosmetic use can be used. Examples of such commercially available products include sodium hyaluronate such as "Hyaluronic Acid Solution HA-LQH1P" manufactured by Kewpie Corporation, "Hyaluronic Acid FCH-200" manufactured by Kikkoman Biochemifa Corporation, "Exogenous Sodium Hyaluronate "Maruha" manufactured by Maruha Nichiro Corporation, and low molecular weight (weight average molecular weight = 10,000 or less) hyaluronic acid such as "Hyalo Oligo" manufactured by Kewpie Corporation. Also, examples of sodium chondroitin sulfate such as "Exogenous Sodium Chondroitin Sulfate" manufactured by Maruha Nichiro Corporation.

[0037] The content of component (F) relative to the total amount of the viscous skin cosmetic of the present invention, converted into the solid content, is preferably 0.0001% by mass to 0.05% by mass, more preferably 0.0005% by mass to 0.04% by mass, and even more preferably 0.001% by mass to 0.03% by mass. When the content of component (F) is within the above range, storage stability at high temperatures is improved, and the difference in feel upon use due to temperature changes is reduced.

[0038] <Water other than component (A)> The viscous skin cosmetic of the present invention may contain normal water in addition to component (A). "Normal water" refers to ion-exchanged water or distilled water that is normally used in skin cosmetics, which contains substantially no minerals and has a hardness of 0 mg / L or less than 1 mg / L. Furthermore, when an aqueous solution or dispersion of an acidic mucopolysaccharide, or a commercially available product in the form of an aqueous solution or dispersion is used as component (F), or when a component in the form of an aqueous solution or dispersion is used as another component described below, the viscous skin cosmetic of the present invention contains water derived from these. Such water is the above-mentioned "normal water" such as ion-exchanged water or distilled water, and is substantially free of minerals and has a hardness of 0 mg / L or less than 1 mg / L.

[0039] The normal water content in the viscous skin cosmetic of the present invention is preferably 60% by mass or less, more preferably 40% by mass or less, and even more preferably 20% by mass or less.

[0040] <Other added ingredients> The viscous skin cosmetic of the present invention may further contain, in addition to the above-mentioned components (A) to (D), and further components (E) and (F), additive components commonly used in cosmetics, within the scope of the present invention. Examples of such added components include moisturizers (glycerin, diglycerin, amino acids, etc.); emollients (olive fruit oil, ceramide, etc.); anti-inflammatory agents (dipotassium glycyrrhizinate, etc.); anti-wrinkle agents (niacinamide, etc.); whitening agents (ascorbyl glucoside, etc.); cell activators; astringents; oils; surfactants; preservatives; pH adjusters; antioxidants; sequestering agents; UV absorbers; UV scattering agents; preservatives; fragrances; colorants; pigments, etc. The content of other added components is preferably 40% by mass or less, and more preferably 30% by mass or less, of the total amount of the viscous skin cosmetic.

[0041] The viscous skin cosmetic of the present invention can be provided in the form of a viscous liquid, gel, emulsion, cream, etc., as skin cosmetics such as serum, emulsion, cream, etc.; base cosmetics such as base gel and base cream; makeup cosmetics such as emulsion foundation and cream foundation; body cosmetics such as body gel and body cream; medicinal cosmetics such as serum, emulsion, cream, etc. for preventing wrinkles, whitening, etc.

[0042] The viscous skin cosmetic of the present invention can be manufactured according to a normal formulation method adopted depending on the form. For example, a viscous liquid or gel skin cosmetic can be manufactured by mixing component (A): natural water with a hardness of 10 mg / L to 200 mg / L, component (B): acrylic acid-based thickening polymer, component (C): dihydric alcohol with 3 to 6 carbon atoms, and component (D): polyoxyethylene sorbitan fatty acid ester or alkyl polyglucoside, and further adding and mixing component (E): thickening polysaccharide and component (F): acidic mucopolysaccharide, and adding and mixing other additive components as necessary, and homogenizing the mixture.

[0043] The viscous skin cosmetic of the present invention contains natural water, yet is resistant to dripping and has a feeling of crumbling when applied, has excellent storage stability at high temperatures, and shows little difference in the feeling when used due to temperature changes. EXAMPLES

[0044] The present invention will be described in more detail below with reference to examples and comparative examples.

[0045] [Examples 1 to 21, Comparative Examples 1 to 5] Viscous Skin Cosmetics (Serums) According to the formulation shown in Table 1, components (A), (D) and ion-exchanged water were mixed and heated, a preliminary dispersion of components (B) and (C) was added and mixed, and the mixture was cooled with stirring to make a homogenous mixture, thereby preparing the viscous skin cosmetic preparations (serums) of Examples 1 to 10. According to the formulation shown in Table 2, components (A), (D), (F) and ion-exchanged water were mixed and heated, a preliminary dispersion of components (B), (C) and (E) was added and mixed, and the mixture was cooled with stirring to make a homogenous mixture, thereby preparing the viscous skin cosmetic preparations (serums) of Examples 11 to 21. In addition, according to the formulation shown in Table 3, components (A), (D) and ion-exchanged water were mixed and heated, and preliminary dispersions of components (B), (C) and (E) were added and mixed, and then cooled with stirring to make the mixture homogenous, thereby preparing the viscous skin cosmetics (serums) of Comparative Examples 1 to 5. In Tables 1 to 3, the numerical value in the column corresponding to each component indicates the content (mass%) of that component relative to the total amount of the viscous skin cosmetic (serum), and a blank column indicates that the component is not contained. Additionally, "(A) / (C)" indicates the ratio (mass ratio) of the content of component (A) to the content of component (C). In Table 3, "-" in the column corresponding to (A) / (C) indicates that the ratio cannot be calculated because component (C) is not contained.

[0046] The following raw materials were used as the components (*1 to *5) in Tables 1 to 3. Other components used were commercially available products provided for use in cosmetics. *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. *4 Acid mucopolysaccharide 1: "Hyaluronic acid solution HA-LQH1P" (aqueous solution containing 1% by mass of sodium hyaluronate (average molecular weight = 1,200,000 to 2,200,000) and 0.8% by mass of phenoxyethanol, manufactured by Kewpie Corporation) was used. The content in the table is the net content of sodium hyaluronate. *5 Acidic mucopolysaccharide 2: "Hyalooligo" (hydrolyzed hyaluronic acid (average molecular weight = 10,000 or less), manufactured by Kewpie Corporation) was used.

[0047] The viscous skin cosmetics of the Examples and Comparative Examples were evaluated for resistance to dripping when applied, feeling of crumbling when applied, storage stability at high temperatures, and difference in feel when used due to temperature changes, as described below.

[0048] (1) Evaluation of dripping resistance when applied The panel consisted of 20 women aged between 25 and 55 years old. Each panelist took 1 g of each of the viscous skin cosmetics of the Examples and Comparative Examples in the palm of their hand and applied it to their face, and scored the resistance to dripping according to the following sensory evaluation criteria. The scores of the 20 panelists were calculated and the resistance to dripping during application was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The number in parentheses below the evaluation result indicates the total evaluation score. Evaluations of "◎" and "○" were deemed to be acceptable.

[0049] <Sensory evaluation criteria> 2 points: There was absolutely no dripping upon application, and it felt like it was very difficult to drip. 1 point: There is almost no dripping when applied and it feels like it is unlikely to drip. 0 points: If there is dripping when applied and it feels like it is prone to dripping.

[0050] <Evaluation criteria> ⊚: Total score is 35 points or more; this is a viscous skin cosmetic that is extremely resistant to dripping when applied. ◯: Total score is 30 or more and 34 or less; it is a viscous skin cosmetic that is excellent in terms of resistance to dripping when applied. △: Total score is 20 points or more and 29 points or less; this is a viscous skin cosmetic that is somewhat inferior in terms of dripping resistance when applied. ×: Total score is 19 points or less; the cosmetic preparation is a viscous skin cosmetic preparation that is poor in resistance to dripping when applied.

[0051] (2) Evaluation of crumbling sensation upon application Twenty women aged 25 to 55 years old were selected as panelists, and each panelist took 1 g of each of the viscous skin cosmetics of the Examples and Comparative Examples in the palm of their hand and applied it to their face, and scored the feeling of crumbling when applied according to the following sensory evaluation criteria. The scores of the 20 panelists were calculated and the feeling of crumbling when applied was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The number in parentheses below the evaluation result indicates the total evaluation score. Evaluations of "◎" and "○" were judged to be acceptable.

[0052] <Sensory evaluation criteria> 2 points: If you feel that the product crumbles significantly upon application. 1 point: If you feel that the product crumbles upon application. 0 points: If there is no feeling of crumbling upon application.

[0053] <Evaluation criteria> ⊚: Total score is 35 points or more; this is a viscous skin cosmetic that is extremely excellent in terms of the feeling of crumbling upon application. ◯: Total score is 30 or more and 34 or less; it is a viscous skin cosmetic that has an excellent feeling of crumbling upon application. Δ: Total score is 20 or more and 29 or less; this is a viscous skin cosmetic that is slightly inferior in terms of the feeling of crumbling upon application. ×: Total score is 19 points or less; this is a viscous skin cosmetic preparation that does not easily crumble upon application.

[0054] (3) Evaluation of storage stability at high temperatures Each of the viscous skin cosmetics of the Examples and Comparative Examples was stored at 50°C for one week, and the condition during storage and after returning to room temperature was observed, and the stability was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The products were judged to pass the evaluation with "◎" and "○".

[0055] <Evaluation criteria> ◎: No change in appearance even at 50℃, and no separation or precipitation was observed when returned to room temperature. ◯: At 50° C., changes in appearance such as turbidity were observed, but no separation or precipitation was observed when returned to room temperature. ×: After storage at 50°C, separation or precipitation was observed when returned to room temperature.

[0056] (4) Evaluation of differences in usability due to temperature changes Each of the viscous skin cosmetics of the Examples and Comparative Examples was stored at 0°C and 50°C for one week, and then returned to room temperature. Twenty women aged 25 to 55 years were selected as panelists, and each panelist took 0.2 g of each of the viscous skin cosmetics stored at 0°C and returned to room temperature on the fingertips of their left hand and applied it to the back of their right hand. Furthermore, each panelist took 0.2 g of each of the viscous skin cosmetics stored at 50°C and returned to room temperature on the fingertips of their right hand and applied it to the back of their left hand. Each panelist scored the difference in usability between the product stored at 0°C and the product stored at 50°C according to the following sensory evaluation criteria. The total evaluation points of the 20 panelists were calculated, and the difference in usability due to temperature change was evaluated according to the following evaluation criteria. The evaluation results are also shown in Tables 1 to 3. The number in parentheses below the evaluation results indicates the total evaluation points. The evaluations of "◎" and "○" were judged to be acceptable.

[0057] <Sensory evaluation criteria> 2 points: If you feel that there is almost no difference in usability due to storage temperature. 1 point: If you feel that there is little difference in usability due to storage temperature. 0 points: If you feel that there is a difference in usability depending on the storage temperature.

[0058] <Evaluation criteria> ⊚: Total score is 35 points or more; this is a viscous skin cosmetic in which the difference in sensation of use due to storage temperature is very small. ○: Total score is 30 or more and 34 or less; this is a viscous skin cosmetic with little difference in feel due to storage temperature. △: Total score is 20 or more and 29 or less; this is a viscous skin cosmetic in which the difference in feel when used depending on the storage temperature is somewhat large. ×: Total score is 19 points or less; this is a viscous skin cosmetic whose sensation of use varies greatly depending on the storage temperature.

[0059] [Table 1]

[0060] [Table 2]

[0061] [Table 3]

[0062] As shown in Tables 1 and 2, all of the viscous skin cosmetics of Examples 1 to 21 were evaluated as viscous skin cosmetics having excellent or very excellent resistance to dripping and crumbling upon application, good storage stability at high temperatures, and little or very little change in the feel when used due to temperature changes. In particular, the viscous skin cosmetic preparations of Examples 5, 7, and 10, which contain components (A) to (D) in the more preferred amounts described above and in which the (A) / (C) value is within the even more preferred range described above, and the viscous skin cosmetic preparation of Example 21, which contains, in addition to components (A) to (D), gellan gum as component (E) and acid mucopolysaccharide 2 as component (F), were all rated as "Excellent" in terms of resistance to dripping and crumbling upon application, storage stability at high temperatures, and difference in feel when used due to temperature change.

[0063] In contrast, as shown in Table 3, none of the viscous skin cosmetics of Comparative Examples 1 to 5 were judged to be pass in any of the evaluation items. That is, the viscous skin cosmetic preparation of Comparative Example 1, which did not contain component (A), was evaluated as being slightly inferior in terms of the feeling of crumbling upon application, and as showing a slightly large difference in the feeling of use due to temperature changes. The viscous skin cosmetic preparation of Comparative Example 2, which contained gellan gum as component (E) instead of component (B), was evaluated as being slightly inferior in resistance to dripping and crumbling upon application. The viscous skin cosmetic of Comparative Example 3, which did not contain component (C), was evaluated as being slightly inferior in terms of the feeling of crumbling upon application, having poor storage stability at high temperatures, and showing a slightly large difference in the feeling of use due to temperature changes. The viscous skin cosmetics of Comparative Examples 4 and 5, which did not contain component (D), were evaluated as being slightly inferior in resistance to dripping when applied, having poor storage stability at high temperatures, and showing a slightly large difference in feel when used due to temperature changes.

[0064] Next, other examples of the viscous skin cosmetic of the present invention will be described.

[0065] [Example 22] Gel-type skin cosmetic Based on the formulation shown in Table 4, a gel-type skin cosmetic was produced as follows. Note that the natural water 3 and acid mucopolysaccharide 1 in Table 4 were the same raw materials as those used in the production of Examples 1 to 21, and the other raw materials were products commercially available for use in cosmetics. The content of acid mucopolysaccharide 1 in Table 4 indicates the net content of sodium hyaluronate.

[0066] <Manufacturing method> Components (D), (F), and other additive components (1) to (12) were added to component (A), mixed, and heated with stirring to make uniform. Next, a preliminary dispersion of components (B), (C), and (E) was added and mixed, and cooled with stirring. The remainder of the ion-exchanged water was then added to make the total amount 100% by mass.

[0067] [Table 4]

[0068] [Example 23] Milky skin cosmetic Based on the formulation shown in Table 5, milky skin cosmetics were produced as follows. Note that the natural water 3 and acid mucopolysaccharide 1 in Table 5 were the same raw materials as those used in the production of the above Examples 1 to 21. The content of acid mucopolysaccharide 1 in Table 5 indicates the net content of sodium hyaluronate.

[0069] <Manufacturing method> Components (A), (F), other additive components (1), (2), (11) to (17), and the remainder of the ion-exchanged water were mixed, dissolved, and heated to 75°C to 80°C to form an aqueous phase. Meanwhile, component (D) and other additive components (3) to (9) were mixed, heated to 75°C to 80°C, and homogenized to form an oil phase. The oil phase was added to the aqueous phase with stirring to emulsify, and a preliminary dispersion of components (B), (C), and (E) was added and mixed, and the mixture was cooled to 40°C with stirring, and the other additive components (10) and (18) were added in order and mixed.

[0070] [Table 5]

[0071] The gel-type skin cosmetic preparation of Example 22 and the milky skin cosmetic preparation of Example 23 both had little dripping and a feeling of crumbling when applied, had excellent storage stability at high temperatures, and showed little difference in the feel when used due to temperature changes. [Industrial Applicability]

[0072] According to the present invention, it is possible to provide a viscous skin cosmetic which contains natural water, is resistant to dripping and has a feeling of crumbling when applied, has excellent storage stability at high temperatures, and shows little difference in feeling when used due to temperature changes.

Claims

1. A viscous skin cosmetic composition comprising 10% by mass to 98% by mass of the following component (A), 0.05% by mass to 1.5% by mass of component (B), 0.5% by mass to 25% by mass of component (C), and 0.001% by mass to 1.6% by mass of component (D): (A) natural water having a hardness of 10 mg / L to 200 mg / L; (B) an acrylic acid-based thickening polymer; (C) a dihydric alcohol having 3 to 6 carbon atoms, and (D) Polyoxyethylene sorbitan fatty acid ester or alkyl polyglucoside.

2. The viscous skin cosmetic according to claim 1, further comprising (E) 0.01% by mass to 1% by mass of a thickening polysaccharide.

3. The viscous skin cosmetic according to claim 1 or 2, further comprising (F) 0.0001% by mass to 0.05% by mass of an acidic mucopolysaccharide.

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