JP7701154B2 - Oil-in-water emulsion cosmetics - Google Patents

Description

The present invention relates to an oil-in-water emulsion cosmetic. More specifically, it relates to an oil-in-water emulsion cosmetic that has a suitable hardness, provides an excellent fit when applied, and can moisturize and firm the skin, and is particularly suitable for use around the eyes.

It is known that the skin of the human face, etc., loses firmness and elasticity due to aging, dryness, ultraviolet rays, and other external stimuli, resulting in sagging and wrinkles. Moisturizing is an effective way to treat these skin problems, and topical skin preparations such as moisturizing creams containing moisturizers have traditionally been used to prevent wrinkles and sagging and maintain or improve the moisturized, youthful condition of skin.

Topical skin preparations that give the skin a firming sensation contain a film-forming agent, a typical example of which is polyvinyl alcohol, and by adjusting the other ingredients and their amounts, it is possible to reduce stickiness and improve storage stability (Patent Document 1).

Patent Document 2 discloses that the stability over time of a salt-type whitening agent contained in an oil-in-water emulsion composition that can impart a firming feeling has been improved (Patent Document 2).

The skin around the eyes is thinner than other parts of the face, and because the capillaries are visible, stagnation of blood flow can easily result in dark circles. Also, the skin moves a lot when you blink, which increases the amount of melanin and promotes dryness. As a result, the skin is prone to losing elasticity, and wrinkles and sagging tend to become more noticeable.

The skin around the eyes is sensitive, so conventional topical skin preparations containing film-forming agents can cause the skin to feel tight, resulting in discomfort. Patent Document 3 discloses a cosmetic product specifically for the eye area, which is said to improve the loss of skin elasticity and the occurrence of wrinkles and sagging without causing a tight feeling, by incorporating a copolymer of 2-methacryloyloxyethyl phosphorylcholine and a hydrophobic monomer, acetylated hyaluronic acid, and a polyhydric alcohol.

However, conventional cosmetics (topical preparations) such as those described in the above-mentioned Patent Documents 1 to 3 have low viscosity and may lack a feeling of fitting to the skin. In particular, cosmetics to be applied around the eyes are required to have an appropriate hardness to improve the feeling of use, such as a feeling of fitting to the skin.

JP 2011-148716 A JP 2012-031088 A JP 2005-068073 A

The present invention has been made in consideration of the problems of the conventional technology, and aims to provide a cosmetic product that maintains smoothness when applied, imparts firmness and a moist feeling (hydration) to the skin, and also has an excellent feel when used, such as a good fit to the skin.

As a result of intensive research by the inventors to solve the above problems, they discovered that in an oil-in-water emulsion cosmetic containing a higher alcohol and a hydrophilic nonionic surfactant, by blending a predetermined amount of solid oil in the oil and a predetermined amount of water-soluble thickener in the aqueous phase to achieve a predetermined or higher viscosity, it is possible to obtain a cosmetic that has the effect of imparting elasticity and firmness to the skin, that feels soft and smooth when applied, that fits well to the skin, and that provides a moist feel without causing a tight feeling, thereby completing the present invention.

That is, the present invention is
(A) at least one selected from higher alcohols having 14 to 22 carbon atoms;
(B) a hydrophilic nonionic surfactant;
An oil-in-water emulsion cosmetic comprising: (C) an oil; and (D) 0.5 to 1.5% by mass of a water-soluble thickener,
The (C) oil component contains 1 to 5 mass% of a (C1) solid oil component and a (C2) liquid oil component based on the total mass of the cosmetic,
To provide a cosmetic having a hardness (needle 8φ, 25° C.) of 5 to 19.

The oil-in-water emulsion cosmetic of the present invention has the effect of providing elasticity and firmness to the skin, and while it has a soft and smooth feel when applied, it fits well on the skin, and while it gives the skin elasticity, firmness, and a moist feel, it does not cause a feeling of tightness. In addition, even when a salt-type whitening agent is blended, it has excellent stability over time and can exert an excellent whitening effect.

The oil-in-water emulsion cosmetic of the present invention (hereinafter also simply referred to as "emulsion cosmetic") contains (A) at least one selected from higher alcohols having 14 to 22 carbon atoms; (B) a hydrophilic nonionic surfactant; (C) an oil component; and (D) a water-soluble thickener.
Each component is described in detail below.

Component (A) in the emulsion cosmetic of the present invention is a higher alcohol having 14 to 22 carbon atoms. Specific examples include myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, etc. One or more of these higher alcohols are used.
In particular, those having a linear saturated alkyl group are preferred, and among these, it is preferred that they contain one or more selected from cetyl alcohol, stearyl alcohol, and behenyl alcohol.

The amount of higher alcohol (component A) in the emulsion cosmetic of the present invention is typically 0.01 to 10% by mass, preferably 0.05 to 8% by mass, and more preferably 0.1 to 5% by mass.

Component (B) in the emulsion cosmetic of the present invention is a hydrophilic nonionic surfactant. In this specification, "hydrophilic" means that the HLB (Hydrophilic-Lipophilic Balance) value, which is determined by the relative strength of the hydrophilic group and the lipophilic group, is 8 or more, preferably 10 or more.

The hydrophilic nonionic surfactant in the present invention is preferably selected from polyoxyethylene alkyl ethers, and in particular, those having a structure in which a linear saturated alkyl chain and a polyoxyethylene chain are bonded by an ether bond are preferred.

The hydrophilic nonionic surfactant (component B) used in the present invention includes those having an average molar number of polyoxyalkylene chains of 2 to 50, preferably 10 to 30, i.e., polyoxyethylene (2-50) alkyl ether, preferably polyoxyethylene (10-30) alkyl ether.

Specific examples include polyoxyethylene (10) stearyl ether, polyoxyethylene (11) stearyl ether, polyoxyethylene (20) stearyl ether, polyoxyethylene (30) stearyl ether, polyoxyethylene (20) behenyl ether, polyoxyethylene (30) behenyl ether, etc., of which polyoxyethylene (20) behenyl ether is particularly preferred.

The amount of hydrophilic polyoxyethylene alkyl ether in the emulsion cosmetic of the present invention is usually 0.01 to 10% by mass, preferably 0.05 to 8% by mass, and more preferably 0.1 to 5% by mass.

The oil component (C) in the emulsion cosmetic of the present invention contains a solid oil component (C1) and a liquid oil component (C2).
(C1) Solid oil is a solid that does not exhibit fluidity at room temperature (25° C.) and normal pressure (1 atmosphere (9.8×10 ⁴ Pa)), and can be defined as oil having a melting point of about 100° C. or higher, for example.
Specific examples of solid oils include hydrocarbon waxes such as paraffin wax (straight-chain hydrocarbons), microcrystalline wax (branched saturated hydrocarbons), ceresin wax, Japanese wax, montan wax, and Fischer-Tropsch wax; solid fats and oils such as cacao butter, coconut oil, horse oil, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, and hydrogenated castor oil; polar waxes such as sucrose acetate stearate and ethylene glycol fatty acid (C18-30) esters; beeswax, lanolin, carnauba wax, candelilla wax, and rice bran wax (rice wax). Examples of waxes include laurel wax, jojoba oil, rice bran wax, kapok wax, bayberry wax, shellac wax, sugarcane wax, lanoline fatty acid isopropyl, hexyl laurate, reduced lanolin, hard lanolin, polyoxyethylene (hereinafter abbreviated as "POE") lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanoline fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, and other waxes; higher fatty acids such as myristic acid, palmitic acid, stearic acid, and behenic acid; (acrylates/stearyl acrylate/dimethicone methacrylate) copolymer, acrylates/behenyl acrylate/dimethicone methacrylate) copolymer, alkyl methicone, alkyl dimethicone, alkyl dimethylsilyl polypropyl silsesquione, and silicone waxes such as stearoxytrimethylsilane. Among these, hydrocarbon waxes are preferred, and microcrystalline waxes are particularly preferred. However, solid higher alcohols corresponding to component (A) are not included in the solid oil content (C1).

The emulsion cosmetic of the present invention must contain the solid oil component (C1) in the oil component (C), thereby maintaining an appropriate hardness of the cosmetic.
The blending amount of the solid oil component (C1) is 1 to 5 mass %, preferably 1.5 to 4.5 mass %, and more preferably 2 to 4 mass %, relative to the total amount of the cosmetic.

The liquid oil (C2) in the present invention is a liquid that has fluidity at room temperature (25° C.) and normal pressure (1 atmosphere (9.8×10 ⁴ Pa)), and can be defined as, for example, an oil having a melting point of 25° C. or lower. Liquid oils are classified into non-volatile oils and volatile oils based on their properties.

In this specification, non-volatile liquid oil means a liquid oil that does not exhibit volatility at room temperature (25°C) and normal pressure (1 atmosphere (9.8 x ¹⁰⁴ Pa)) (for example, oils with a boiling point of about 200°C or higher at normal pressure), and includes, for example, liquid oils such as hydrocarbon oils and vegetable oils, ester oils, high-molecular-weight polyoxyalkylene glycols, silicone oils, etc.

Specific examples of non-volatile liquid oils include liquid oils such as linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, apricot kernel oil, cinnamon oil, jojoba oil, grape oil, almond oil, rapeseed oil, sesame oil, sunflower oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, egg yolk oil, liver oil, triglycerin, glyceryl trioctanoate, and glyceryl triisopalmitate; octanoic acid esters such as cetyl octanoate, isooctanoic acid esters such as glyceryl tri-2-ethylhexanoate and pentaerythritol tetra-2-ethylhexanoate, and hexyl laurate. Examples of the non-volatile silicone oil include ester oils such as lauric acid esters, myristic acid esters such as isopropyl myristate and octyldodecyl myristate, palmitic acid esters such as octyl palmitate, stearic acid esters such as isocetyl stearate, isostearic acid esters such as isopropyl isostearate, isopalmitic acid esters such as octyl isopalmitate, oleic acid esters such as isodecyl oleate, adipic acid diesters such as diisopropyl adipate, sebacic acid diesters such as diethyl sebacate, and diisostearyl malate; liquid paraffin, squalane, and other hydrocarbon oils; polyoxybutylene polyoxypropylene glycol, etc. Examples of the non-volatile silicone oil include methylpolysiloxane (6cs), methylpolysiloxane (20cs), methylpolysiloxane (100cs), methylphenylpolysiloxane, amino-modified silicone, and fluorine-modified dimethylpolysiloxane, etc.

The volatile oils that can be incorporated into the cosmetic composition of the present invention include volatile hydrocarbon oils and volatile silicone oils.
The volatile hydrocarbon oil is not particularly limited as long as it is a hydrocarbon oil (e.g., a hydrocarbon having a boiling point of less than 200° C.) that is volatile at room temperature (25° C.) and normal pressure (1 atmosphere (9.8×10 ⁴ Pa)) that has been conventionally used in cosmetics, etc. Specific examples include isododecane, isohexadecane, and hydrogenated polyisobutene.

Volatile silicone oils are silicone oils (e.g., silicone oils with a boiling point of less than 200°C) that are volatile at room temperature (25°C) and normal pressure (1 atmosphere (9.8 x ¹⁰⁴ Pa)) and have been conventionally used in cosmetics and the like, and include volatile linear silicone oils (volatile dimethicones) and volatile cyclic silicone oils (volatile cyclodimethicones).

As the volatile dimethicone, a low-viscosity dimethylpolysiloxane (for example, with a viscosity of about 100 to 500 mPa·s at 30°C) such as decamethyltetrasiloxane can be used, and examples of commercially available products include KF-96L-1.5cs and KF-96L-2cs (both manufactured by Shin-Etsu Chemical Co., Ltd.). As the volatile cyclodimethicone, decamethylcyclopentasiloxane can be used.

In the emulsion cosmetic of the present invention, it is preferable to combine at least one non-volatile hydrocarbon oil and at least one volatile hydrocarbon oil. Of these, it is preferable to select squalane as the non-volatile hydrocarbon oil and isododecane as the volatile hydrocarbon oil. By adopting such an embodiment, it is possible to further improve the feel when applying the cosmetic.

In addition, the (C) oil component in the emulsion cosmetic of the present invention may contain other oil components not generally classified as the above-mentioned (C1) solid oil component or (C2) liquid oil component, as long as the effects of the present invention are not impaired. Examples of other oil components include (C3) semi-solid oil component and (C4) oil-based ultraviolet absorber.

(C3) Semi-solid oils are oils that exhibit some fluidity at room temperature (25°C) and normal pressure (1 atmosphere (9.8 x 104 Pa)) but do not fall under (C2) liquid oils (e.g., oils with a melting point below about 100°C and a boiling point above 200°C). Examples include petrolatum, hydrogenated palm oil, palm kernel oil, macadamia nut oil phytosteryl, and tetra(behenic acid/benzoic acid/ethylhexanoic acid)pentaerythritol.

(C4) Examples of oil-based UV absorbers include benzoic acid UV absorbers such as para-aminobenzoic acid, para-aminobenzoic acid monoglycerin ester, N,N-dipropoxy para-aminobenzoic acid ethyl ester, and N,N-dimethyl para-aminobenzoic acid ethyl ester, anthranilic acid UV absorbers such as homomenthyl-N-acetylanthranilate, amyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate. Salicylic acid-based ultraviolet absorbers such as lysylates, octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate, 2-ethylhexyl α-cyano-β-phenyl cinnamate, glycol Cinnamic acid-based ultraviolet absorbers such as ceryl mono-2-ethylhexanoyl-di-p-methoxycinnamate, benzophenones such as 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, and 2-ethylhexyl-4'-phenylbenzophenone-2-carboxylate. system ultraviolet absorbers, 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, urocanic acid, urocanic acid ethyl ester, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and the like.

The amount of oil (C) in the emulsion cosmetic of the present invention is not particularly limited, but the total amount of solid oil (C1), liquid oil (C2), and optionally semi-solid oil (C3) and oil-based UV absorber (C4) is preferably 10 to 40% by mass, preferably 15 to 38% by mass, and more preferably 20 to 35% by mass, based on the total amount of the cosmetic.

In the emulsion cosmetic of the present invention, it is believed that the (A) higher alcohol, (B) hydrophilic nonionic surfactant, and (C2) liquid oil component form a so-called α-gel structure together with the external phase water, thereby maintaining a stable emulsion.

The water-soluble thickener (D) in the emulsion cosmetic of the present invention is a water-soluble thickener that can be generally used in cosmetics.
Specific examples include vinyl polymers such as polyvinyl methyl ether and carboxyvinyl polymer, polyoxyethylene polymers, polyoxyethylene-polyoxypropylene copolymer polymers, acrylic polymers such as polyethyl acrylate and polyacrylamide, polyethyleneimine, cationic polymers, inorganic water-soluble polymers such as bentonite, magnesium aluminum silicate, laponite, hectorite, and silicic anhydride, PEG-240/decyltetradeceth-20/hexamethylene diisocyanate copolymers, (dimethylacrylamide/Na acryloyldimethyltaurate) crosspolymers, (sodium acrylate/acryloyldimethyltaurate) copolymers, (alkyl acrylate/steareth-20 methacrylate) copolymers, (ammonium acryloyldimethyltaurate/VP) copolymers, etc. The emulsion cosmetic of the present invention does not need to contain polyvinyl alcohol, which is believed to impart firmness, and if it does contain it, the blending amount is 0.3% by mass or less.

In addition to the above, examples include plant-based polymers such as gum arabic, tragacanth, galactan, carob gum, guar gum, karaya gum, carrageenan, xanthan gum, pectin, agar, quince seed, and algae colloid (brown algae extract); microbial polymers such as dextran, succinoglucan, and pullulan, and animal polymers such as collagen, casein, albumin, and gelatin; starch-based polymers such as starch (rice, corn, potato, and wheat), carboxymethyl starch, and methylhydroxypropyl starch; cellulose-based polymers such as methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropylcellulose, sodium carboxymethylcellulose, crystalline cellulose, and cellulose powder; and alginate-based polymers such as sodium alginate and propylene glycol alginate.

In the present invention, it is particularly preferable to use a (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer as the water-soluble thickener (D) because it imparts an appropriate hardness.

The blending amount of the water-soluble thickener (D) in the emulsion cosmetic of the present invention is within the range of 0.5 to 1.5 mass%, preferably 0.6 to 1.3 mass%, and more preferably 0.7 to 1.2 mass%. If the blending amount of the water-soluble thickener (component D) is less than 0.5 mass%, it is not possible to achieve an appropriate hardness, and if it is blended in an amount exceeding 1.5 mass%, stickiness may occur.

The emulsion cosmetic of the present invention is characterized by its hardness (rheometer, needle 8φ, 25°C) of 5 to 19, preferably 8 to 19. By adjusting the hardness as described above, it becomes possible to obtain an excellent fit when applied.

The inventors have found that the feeling of fit when applying an emulsion cosmetic correlates with the average vibration energy measured by the following method.

-Method of measuring average vibration energy A three-axis acceleration sensor (e.g., manufactured by Tech Gihan Co., Ltd., model: A3AX) is attached to the side of the index finger nail of one hand of the subject. 20 μL of cosmetic material is dropped and spread on the skin on the inside of the forearm of the other hand. While the index finger is in contact with the surface of the spread cosmetic material (area of 2 cm x 6 cm), the tip of the index finger is moved at a speed of one round trip per second while applying a force of 0.1 to 0.5 N. The above operation is continued for 60 seconds from immediately after the cosmetic material is dropped and spread (0 seconds), and the vibration during that time is detected by the three-axis acceleration sensor. Next, the vibration energy at each second and each frequency is calculated by performing a short-time Fourier transform on the vibration data detected by the three-axis acceleration sensor.

When the correlation between the average vibration energy obtained by the above-mentioned method and the fitting sensation of a cosmetic (base) was examined, it was found that a cosmetic having an average vibration energy that satisfies any one, preferably two or more, of the following conditions has a particularly excellent fitting sensation.
(1) In a frequency range of 80 to 90 Hz, 20 to 60 seconds after the cosmetic is dropped and spread, the intensity is greater than 3.75×10 ⁻⁶ and not more than 5.31×10 ⁻⁶ , preferably greater than 3.80×10 ⁻⁶ and not more than 5.31×10 ⁻⁶ .
(2) In the frequency range of 10 to 20 Hz, 40 to 60 seconds after the cosmetic is dropped and spread, the refractive index is greater than 6.21×10 ⁻⁵ and not more than 9.14×10 ⁻⁵ , preferably not less than 6.25×10 ⁻⁵ and not more than 9.14×10 ⁻⁵ .
(3) A value greater than 8×10 ⁻⁷ and equal to or less than 2×10 ⁻⁶ in the frequency range of 150 to 200 Hz from immediately (0 seconds) to 30 seconds after the cosmetic is dropped and spread.
(4) A value greater than 3.4×10 ⁻⁷ and not greater than 1.5×10 ⁻⁶ in the frequency range of 300 to 500 Hz from immediately (0 seconds) to 30 seconds after the cosmetic is dropped and spread.
(5) A value greater than 1.41×10 ⁻⁶ and not greater than 2.2×10 ⁻⁶ in the frequency range of 150 to 300 Hz 30 to 60 seconds after the cosmetic is dropped and spread.

Of the above conditions, it is particularly preferable for the cosmetic preparation to satisfy both conditions (1) and (2) from the viewpoint of providing an excellent feeling of fitting.
Therefore, by preparing an emulsion cosmetic that satisfies the requirements for ingredients, amounts, and hardness described in claim 1 below, measuring the average vibrational energy of the prepared emulsion cosmetic in accordance with the above-mentioned method, and selecting a cosmetic whose average vibrational energy satisfies the above conditions (1) and (2), it is possible to obtain the emulsion cosmetic of the present invention that has a particularly excellent fit.

In addition to the above-mentioned components, the emulsion cosmetic of the present invention can contain, as necessary, various ingredients that are typically used in cosmetics and topical skin preparations such as quasi-drugs, such as moisturizers, powder ingredients, and whitening agents.

Examples of moisturizing agents include polyhydric alcohols, hyaluronic acid and its derivatives, sugar alcohols such as trehalose, cholesteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, urea, diglycerol ethylene oxide/propylene oxide adduct, etc.

Examples of polyhydric alcohols include ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, erythritol, trimethylolpropane, pentaerythritol, sorbitol, maltitol, diglycerin, polyethylene glycol, etc.

Examples of powder components include inorganic powders such as talc, kaolin, mica, sericite, gold mica, synthetic mica, magnesium carbonate, calcium carbonate, aluminum silicate, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (zinc myristate, calcium palmitate, aluminum stearate, etc.), and boron nitride; organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, polymethylsilsesquioxane powder, and cellulose powder; and titanium dioxide. Examples of the pigments include inorganic pigments such as zinc oxide, iron oxide (red iron oxide), iron titanate, yellow iron oxide, black iron oxide, carbon black, low-order titanium oxide, mango violet, cobalt violet, chromium oxide, ultramarine, and Prussian blue, pearl pigments such as titanium oxide coated mica, titanium oxide coated bismuth oxychloride, colored titanium oxide coated mica, bismuth oxychloride, and fish scale foil, metal powder pigments such as aluminum powder, organic pigments such as Red No. 201, Red No. 202, Orange No. 203, Yellow No. 205, Yellow No. 401, and Blue No. 404, organic pigments such as zirconium, barium, and aluminum lakes such as Red No. 3, Yellow No. 4, Green No. 3, and Blue No. 1, and natural pigments such as chlorophyll and β-carotene. Examples of the synthetic resin emulsions include acrylic resin emulsions and polyvinyl acetate resin emulsions.

The various agents include other skin lightening agents such as vitamin C and its derivatives, vitamin A and its derivatives, alkoxysalicylic acid and its derivatives, arbutin, kojic acid, and the like.
Other examples include metal sequestering agents such as disodium edetate, trisodium edetate, sodium citrate, sodium polyphosphate, sodium metaphosphate, and gluconic acid, caffeine, tannin, verapamil, tranexamic acid and its derivatives, licorice extract, glabridin, hot water extract of fire thorn fruit, various herbal medicines, tocopherol acetate, glycyrrhizic acid and its derivatives or salts thereof, and the like.

The oil-in-water emulsion cosmetic of the present invention can be provided in the form of a milky lotion, cream, beauty essence, foundation, makeup base, etc., and is not particularly limited. The emulsion cosmetic of the present invention has a suitable hardness and is therefore particularly suitable for eye cosmetics such as eye creams.

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. The blending amounts are expressed in mass % unless otherwise specified.

(Test Examples 1 to 4)
Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 1. The properties of each of the oil-in-water emulsion cosmetics prepared were then evaluated using the following methods.

<Measurement of fit by average vibration energy>
Measurement method: Using the emulsion cosmetic of each example, the average vibrational energy was measured in accordance with the method described in paragraph 0041 above. Then, the average vibrational energy was calculated (1) in a frequency range of 80 to 90 Hz from 20 to 60 seconds after the cosmetic was dropped and spread, and (2) in a frequency range of 10 to 20 Hz from 40 to 60 seconds after the cosmetic was dropped and spread. The results are shown in Table 1.

<Sensory test>
The evaluation method is shown below.
A panel of 20 experts evaluated the non-stickiness of the compositions after application to the skin.
A (good): 15 or more panelists rated it as excellent B (slightly poor): 8 to 14 panelists rated it as excellent C (poor): 7 or less panelists rated it as excellent The evaluation items were fit, moist feeling, firmness, penetration, non-stickiness, smoothness and softness of the cream.

The results shown in Table 1 above indicate that the average vibration energy value at which the cosmetic material (base) exhibits a good fit is within the following range.
(1) greater than 3.75×10 ⁻⁶ and less than 5.31×10 ^{−6 in the frequency range of 80 to 90 Hz, 20 to 60 seconds after the cosmetic is dropped and spread; and (2) greater than 6.21×10 −5} and less than 9.41× ^{10 −5 in} the frequency range of 10 to 20 Hz, 40 to 60 seconds after the cosmetic is dropped and spread.

Further embodiments of the present invention will be described below.
The oil-in-water emulsion cosmetics (Examples) having the compositions shown in Table 2 below were also subjected to the same property evaluation as above, and excellent results were obtained in all cases.

Claims (5)

(A) 0.1 to 5 mass% of at least one selected from higher alcohols having 14 to 22 carbon atoms;
(B) 0.1 to 1% by mass of a hydrophilic nonionic surfactant;
An oil-in-water emulsion cosmetic comprising: (C) 20 to 35% by mass of an oil; and (D) 0.7 to 1.2% by mass of a water-soluble thickener,
The hydrophilic nonionic surfactant (B) is composed of polyoxyethylene (2-50) alkyl ether,
The (C) oil component contains 2 to 4 mass% of a (C1) solid oil component and a (C2) liquid oil component based on the total mass of the cosmetic,
The liquid oil component (C2) contains squalane,
The blending amount of polyvinyl alcohol in the (D) water-soluble thickener is 0.3 mass% or less,
A cosmetic preparation characterized by not containing an anionic surfactant . The cosmetic preparation according to claim 1 , wherein the solid oil component (C1) is a microcrystalline wax. The cosmetic preparation according to claim 1 or 2, wherein the water-soluble thickener (D) is a (dimethylacrylamide/sodium acryloyldimethyltaurate) crosspolymer. The cosmetic preparation according to any one of claims 1 to 3, wherein the liquid oil component (C2) includes a non-volatile hydrocarbon oil and a volatile hydrocarbon oil. The cosmetic preparation according to claim 4, wherein the volatile hydrocarbon oil comprises isododecane.