Oil-in-water type emulsified skin cosmetic

Abstract

To provide oil-in-water type emulsified skin cosmetics that create a film with a lamellar α-gel structure on a skin surface, ensuring improved moisturizing effects even post towel-drying, along with sustained effectiveness, and satisfying user experience.SOLUTION: Oil-in-water type emulsified skin cosmetics comprise (A) an anionic surfactant: 0.05 mass% or more and 3 mass% or less, (B) higher alcohol: 0.1 mass% or more and 6 mass% or less, (C) at least one compound selected from mono fatty acid glycerol ester, di-fatty acid glycerol ester, mono fatty acid sorbitan ester and di-fatty acid sorbitan ester: 0.3 mass% or more and 12 mass% or less, (D) polypropylene glycol or its lower alkyl ether, where MH and ML, calculated from a chromatograph determined by gel permeation chromatography measurement, satisfy a relationship of a formula (1): 0.35≤ML / MH≤0.75: 0.05 mass% or more and 10 mass% or less, and (E) an organic base: 0.01 mass% or more and 1.5 mass% or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oil-in-water emulsified skin cosmetic preparation. [Background technology]

[0002] As skin cosmetics with excellent long-lasting moisturizing effect on the skin, skin cosmetics that form a uniform and flexible lamellar α-gel structure film on the skin surface and that contain dialkyl ether, alkyl-modified carboxyvinyl polymer, highly polymerized silicone, etc. in addition to oils such as higher alcohols and higher fatty acids have been reported (Patent Documents 1 to 3). However, when these conventional cosmetics are applied to wet skin after washing the face, showering, bathing, etc. in an attempt to obtain a sufficient moisturizing effect, they do not adhere sufficiently to the skin, and sufficient moisturizing effect cannot be obtained after towel drying. Therefore, the present inventors discovered that by incorporating one or more compounds selected from polyether-modified silicones and alkyl polyether-modified silicones in addition to higher alcohols, anionic surfactants, and specific polyhydric alcohol fatty acid esters, a film with a lamellar α-gel structure can be formed on the skin even when applied to wet skin, and the formulation remains on the skin for a long time even after towel drying, suppresses moisture evaporation from the skin, exhibits sustained moisturizing effects, and has a pleasant feel on the skin, and have filed a patent application for this finding (Patent Document 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-227304 A [Patent Document 2] JP 2015-227305 A [Patent Document 3] JP 2016-222598 A [Patent Document 4] JP 2018-203730 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, even the cosmetic composition described in Patent Document 4, when applied to wet skin, had insufficient moisturizing effect after towel drying, its duration, and usability. Therefore, an object of the present invention is to provide an oil-in-water emulsion skin cosmetic that forms a film with a lamellar α-gel structure on the skin, has a high and long-lasting moisturizing effect even after towel drying, and has a good feel when used. [Means for solving the problem]

[0005] Therefore, the present inventors conducted further studies to improve the moisturizing effect after towel drying and its duration. As a result, they discovered that by blending polypropylene glycol or a lower alkyl ether thereof having a specific molecular weight distribution in addition to an anionic surfactant, a higher alcohol, an organic base, and a glycerol fatty acid ester or a sorbitan fatty acid ester to form an oil-in-water emulsion composition, it is possible to obtain an oil-in-water emulsion skin cosmetic which forms a film with a lamellar α-gel structure on the skin, and which has a feeling of clinging to the skin even after towel drying, thereby providing a sense of excellent moisturizing effect, and which has a sustained clinging ability to the skin and a pleasant feel in use, thereby completing the present invention.

[0006] That is, the present invention provides an oil-in-water emulsion skin cosmetic preparation containing the following components (A), (B), (C), (D) and (E). (A) anionic surfactant, 0.05% by mass or more and 3% by mass or less; (B) higher alcohol, 0.1% by mass or more and 6% by mass or less; (C) 0.3% by mass or more and 12% by mass or less of one or more compounds selected from mono-fatty acid glycerin esters, di-fatty acid glycerin esters, mono-fatty acid sorbitan esters, and di-fatty acid sorbitan esters, (D) M calculated from a chromatogram obtained by gel permeation chromatography measurement H and M. Land 0.05% by mass or more and 10% by mass or less of a polypropylene glycol or a lower alkyl ether thereof, which satisfies the relationship of formula (1),

[0007] [Number 1] 0.35≦M L / M H ≦0.75 (1)

[0008] (In formula (1), the length of the perpendicular line from the maximum point K on the chromatogram where the refractive index intensity is maximum to the baseline B is L, and of the two points on the chromatogram where the refractive index intensity is L / 2, the point O is the one with the earlier elution time and the point Q is the one with the later elution time. The intersection point between the straight line G connecting the points O and Q and the perpendicular line drawn from the maximum point K to the baseline is P. The distance between the point O and the intersection point P is M. H Let the distance between point Q and intersection point P be M L (Assuming that) (E) Organic base: 0.01% by mass or more and 1.5% by mass or less Effect of the Invention

[0009] The skin cosmetic of the present invention forms a film of a lamellar α-gel structure on the skin even when applied to wet skin, providing a feeling of excellent moisturizing effect that feels as if it is clinging to the skin even after towel drying, and the ability to cling to the skin is sustained. In addition, the skin cosmetic composition of the present invention also provides a good feel when used, such as good compatibility with the skin when applied to wet skin, a bouncy feeling on the skin after application to wet skin and towel drying, and no stickiness on the skin. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The cosmetic of the present invention is an oil-in-water emulsion skin cosmetic, and one embodiment thereof contains the following components (A), (B), (C), (D) and (E). (A) anionic surfactant, 0.05% by mass or more and 3% by mass or less; (B) higher alcohol, 0.1% by mass or more and 6% by mass or less; (C) 0.3% by mass or more and 12% by mass or less of one or more compounds selected from mono-fatty acid glycerin esters, di-fatty acid glycerin esters, mono-fatty acid sorbitan esters, and di-fatty acid sorbitan esters, (D) M calculated from a chromatogram obtained by gel permeation chromatography measurement H and M. L and 0.05% by mass or more and 10% by mass or less of a polypropylene glycol or a lower alkyl ether thereof, which satisfies the relationship of formula (1),

[0011] [Number 2] 0.35≦M L / M H ≦0.75 (1)

[0012] (In formula (1), the length of the perpendicular line from the maximum point K on the chromatogram where the refractive index intensity is maximum to the baseline B is L, and of the two points on the chromatogram where the refractive index intensity is L / 2, the point O is the one with the earlier elution time and the point Q is the one with the later elution time. The intersection point between the straight line G connecting the points O and Q and the perpendicular line drawn from the maximum point K to the baseline is P. The distance between the point O and the intersection point P is M. H Let the distance between point Q and intersection point P be M L (Assuming that) (E) Organic base: 0.01% by mass or more and 1.5% by mass or less

[0013] Component (A) in the present invention is an anionic surfactant that has the function of forming a lamellar membrane (α-gel) on the skin by forming emulsified particles in an oil-in-water emulsion skin cosmetic preparation into a lamellar structure. The anionic surfactant of component (A) is not limited as long as it is one that is used in ordinary cosmetics, and examples thereof include fatty acids having 12 to 22 carbon atoms or salts thereof, such as sodium laurate, potassium palmitate, and arginine stearate; alkyl sulfates having 12 to 22 carbon atoms or salts thereof, such as sodium lauryl sulfate and potassium lauryl sulfate; alkyl ether sulfates having 12 to 22 carbon atoms or salts thereof, such as polyoxyethylene triethanolamine lauryl sulfate; acyl sarcosines having 12 to 22 N-carbon atoms or salts thereof, such as sodium lauroyl sarcosine; alkyl phosphoric acids having 12 to 22 carbon atoms or salts thereof, such as sodium monostearyl phosphate; Examples of the polyoxyethylene alkyl ether phosphate having 12 to 22 carbon atoms, such as sodium tearyl ether phosphate, or a salt thereof; dialkyl sulfosuccinic acid having 12 to 24 carbon atoms, such as sodium di-2-ethylhexyl sulfosuccinate, or a salt thereof; N-alkyloylmethyl taurine having 12 to 22 carbon atoms, such as sodium N-stearoyl-N-methyl taurine, or a salt thereof; and N-acyl glutamic acid having 12 to 22 carbon atoms, or a salt thereof, such as sodium dilauroyl glutamate, monosodium N-lauroyl glutamate, sodium N-stearoyl-L-glutamate, arginine N-stearoyl glutamate, sodium N-stearoyl glutamate, and sodium N-myristoyl-L-glutamate.

[0014] The anionic surfactant of component (A) is preferably one other than a fatty acid or its salt, and is preferably one or more selected from polyoxyethylene alkyl ether phosphate having 12 to 22 carbon atoms or its salt, sodium N-alkyloylmethyl taurate having 12 to 22 carbon atoms, and N-acyl glutamate having 12 to 22 carbon atoms. From the viewpoint of obtaining a feeling of sticking to the skin after towel drying by applying to wet skin and from the viewpoint of maintaining this feeling, sodium N-alkyloylmethyl taurate having 12 to 22 carbon atoms, and N-acyl glutamate having 12 to 22 carbon atoms or its salt are more preferable. As the N-acyl glutamate having 12 to 22 carbon atoms, N-stearoyl-L-glutamate is preferable, and at least one selected from N-stearoyl-L-glutamic acid arginine salt and N-stearoyl-L-glutamic acid potassium salt is more preferable.

[0015] Component (A) can be used alone or in combination of two or more types. From the viewpoints of imparting a lamellar structure to the emulsified particles in the skin cosmetic, of forming a lamellar film (α-gel) on the skin and applying it to wet skin to obtain a feeling of the skin clinging to the skin after towel drying, of maintaining this feeling, and of obtaining a good feel when used, the content of the compound excluding counter ions is from 0.05 to 3% by mass in the total composition, preferably from 0.08 to 2% by mass, and more preferably from 0.1 to 1.5% by mass.

[0016] Component (B) is a higher alcohol that gives the emulsified particles in the skin cosmetic a lamellar structure, forms a lamellar film (α-gel) on the skin, and contributes to the moisturizing effect and the durability of the moisturizing effect. The higher alcohol of component (B) is preferably a linear saturated alcohol having 12 to 22 carbon atoms, such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol. Of these, linear saturated alcohols having 14 to 22 carbon atoms are preferred, linear saturated alcohols having 16 to 22 carbon atoms are more preferred, and from the viewpoint of improving the durability of the moisturizing effect, at least one selected from cetyl alcohol and stearyl alcohol is even more preferred, and cetyl alcohol and stearyl alcohol are even more preferred. When cetyl alcohol and stearyl alcohol are contained, they may be blended independently or in mixture, and further, cetostearyl alcohol, which is a mixture thereof, may be blended.

[0017] Component (B) can be used alone or in combination of two or more types. From the viewpoint of imparting a lamellar structure to the emulsified particles in the skin cosmetic, from the viewpoint of forming a lamellar film (α-gel) on the skin and providing a feeling of clinging to wet skin even after application to wet skin and towel drying, and from the viewpoint of the persistence of this feeling, the content is from 0.1 to 6% by mass, preferably from 0.2 to 5% by mass, and more preferably from 0.3 to 4% by mass, of the total composition.

[0018] Component (C) is one or more compounds selected from mono-fatty acid glycerin esters, di-fatty acid glycerin esters, mono-fatty acid sorbitan esters, and di-fatty acid sorbitan esters. Component (C) has the function of forming a lamellar structure of the emulsion particles in the skin cosmetic and a lamellar film (α-gel) on the skin, and of obtaining and sustaining a feeling of adhesion to wet skin even after application to wet skin and towel drying. The fatty acids constituting these compounds preferably have 12 to 22 carbon atoms, and more preferably 16 to 18 carbon atoms, from the viewpoints of forming a lamellar structure in the emulsified particles in the skin cosmetic and a lamellar membrane (α-gel) on the skin, and obtaining and sustaining a feeling of clinging to wet skin even after application to wet skin and towel drying. From the viewpoint of fully exerting the function of the above-mentioned component (C), at least one selected from mono-fatty acid glycerin esters and di-fatty acid sorbitan esters is preferred as component (C). Among the mono-fatty acid glycerin esters, monoglyceryl behenate is preferred, among the di-fatty acid sorbitan esters, sorbitan distearate is preferred, and at least one selected from monoglyceryl behenate and sorbitan distearate is preferred, and it is more preferred to include both monoglyceryl behenate and sorbitan distearate.

[0019] Component (C) can be used alone or in combination of two or more types. From the viewpoint of forming a lamellar structure for the emulsified particles in the skin cosmetic and forming a lamellar film (α-gel) on the skin, and obtaining and sustaining a feeling of clinging to wet skin even after application to wet skin and towel drying, the content is from 0.3 to 12% by mass, preferably from 0.5 to 10% by mass, and more preferably from 1 to 8% by mass, of the total composition.

[0020] In the present invention, the mass ratio of component (A) to the total amount of components (B) and (C) [(B)+(C)] is preferably (A) / [(B)+(C)]=0.05 or more and 0.5 or less, more preferably 0.08 or more and 0.4 or less, and even more preferably 0.1 or more and 0.3 or less, from the viewpoint of forming a lamellar structure in the emulsion particles in the skin cosmetic, and from the viewpoint of obtaining and sustaining a feeling of the composition clinging to wet skin even after application to wet skin and towel drying. Furthermore, the mass ratio of component (B) to the total amount of components (B) and (C) [(B)+(C)] is preferably (B) / [(B)+(C)]=0.2 or more and 0.75 or less, more preferably 0.25 or more and 0.6 or less, and even more preferably 0.3 or more and 0.5 or less, from the viewpoint of forming a lamellar structure of the emulsion particles in the skin cosmetic, and from the viewpoint of obtaining and sustaining a feeling of the composition clinging to wet skin even after application to wet skin and towel drying.

[0021] Component (D) is M calculated from a chromatograph obtained by gel permeation chromatography measurement. H and M.L and is a polypropylene glycol or a lower alkyl ether thereof satisfying the relationship of formula (1).

[0022] [Number 3] 0.35≦M L / M H ≦0.75 (1)

[0023] (In formula (1), the length of the perpendicular line from the maximum point K on the chromatogram where the refractive index intensity is maximum to the baseline B is L, and of the two points on the chromatogram where the refractive index intensity is L / 2, the point O is the one with the earlier elution time and the point Q is the one with the later elution time. The intersection point between the straight line G connecting the points O and Q and the perpendicular line drawn from the maximum point K to the baseline is P. The distance between the point O and the intersection point P is M. H Let the distance between point Q and intersection point P be M L (Assuming that) Component (D) is the main component that provides an excellent moisturizing effect, such as a feeling that the skin clings to the skin even after towel drying, and has the function of maintaining this clinging power to the skin.

[0024] The polyalkylene glycol or lower alkyl ether thereof of component (D) used in the present invention is defined by a chromatogram obtained using a differential refractometer in gel permeation chromatography (GPC) as described in JP 2018-104342 A. This chromatogram is a graph showing the relationship between refractive index intensity and elution time, with the horizontal axis showing elution time and the vertical axis showing refractive index intensity obtained using a differential refractometer. When a sample solution is injected into a gel permeation chromatograph and developed, elution begins with the molecule with the highest molecular weight, and the elution curve rises as the refractive index intensity increases. After that, after passing the maximum point K where the refractive index intensity is maximum, the elution curve descends. ML / MH is calculated from the chromatogram as follows. (1) Draw a perpendicular line from the maximum refractive index intensity point K on the chromatogram to the baseline B, and let the length of the perpendicular line be L. (2) Of the two points on the chromatogram where the refractive index strength is L / 2, the one with the earlier elution time is designated as point O, and the one with the later elution time is designated as point Q. (3) Let P be the intersection point between the straight line G connecting points O and Q and the perpendicular line drawn from the maximum point K of the refractive index intensity to the baseline B.

[0025] M in the above formula (1) L / M H From the viewpoint of preventing a decrease or an increase in the viscosity of polypropylene glycol or its lower alkyl ether, is 0.35 or more and 0.75 or less, preferably 0.36 or more and 0.75 or less, and more preferably 0.36 or more and 0.62 or less. In addition, the average number of moles of oxypropylene groups added in the polypropylene glycol is preferably 50 or more and 250 or less, and more preferably 50 or more and 150 or less, from the viewpoints of preventing a decrease in the viscosity of the skin cosmetic composition of the present invention, obtaining an excellent moisturizing effect such that the skin feels like it is sticking to the skin even after towel drying, and obtaining the function of maintaining the sticking power to the skin. As the lower alkyl ether, an alkyl ether having 1 to 6 carbon atoms is preferred.

[0026] Furthermore, it is preferable that component (D) is one in which a chromatogram represented by refractive index intensity and elution time obtained using a differential refractometer in gel permeation chromatography is asymmetric, and the asymmetry value As of the peak of the chromatogram calculated as described below satisfies the relationship between the following formulas (2) and (3).

[0027] [Number 4]

[0028] As = W1 / 2 / W5% (2) 0.30≦A≦0.70 (3)

[0029] (In formula (2), of the two points on the chromatogram where the refractive index intensity is L / 20, the one with the earlier elution time is designated as point R, the one with the later elution time is designated as point S, the intersection point between a straight line H connecting points R and S and a perpendicular line drawn from the maximum point K to the baseline B is designated as T, the distance between point R and intersection point T is designated as W1 / 2, and the distance between point R and point S is designated as W5%).

[0030] As described in JP 2018-104342 A, As can be calculated as follows. (1) Draw a perpendicular line from the maximum refractive index intensity point K on the chromatogram to the baseline B, and let its length be L. (2) Of the two points on the chromatogram where the refractive index intensity is L / 20, the one with the earlier elution time is designated as point R, and the one with the later elution time is designated as point S. (3) Let T be the point of intersection between a straight line H connecting points R and S and a perpendicular line drawn from the maximum point K of the refractive index intensity to the baseline B. (4) The distance between point R and intersection point T is W1 / 2, and the distance between point R and point S is W5%.

[0031] In order to prevent a decrease or increase in the viscosity of the polypropylene glycol or its lower alkyl ether, As in the formula (3) is preferably 0.30 or more and 0.70 or less, more preferably 0.35 or more and 0.65 or less, and even more preferably 0.50 or more and 0.65 or less.

[0032] In the present invention, M L , M H Gel permeation chromatography (GPC) to determine As was performed as described in JP 2018-104342 A, using a SHODEX (registered trademark) GPC101 GPC dedicated system as the system, a SHODEX RI-71s differential refractometer, a SHODEX KF-G guard column, and three SHODEX KF804L columns in series, with the column temperature at 40°C and tetrahydrofuran as the developing solvent at a flow rate of 1 ml / min, injecting 0.1 ml of a 0.1 wt % tetrahydrofuran solution of the resulting reaction product, and using a BORWIN GPC calculation program to obtain a chromatogram represented by refractive index intensity and elution time.

[0033] Specifically, the polypropylene glycol or lower alkyl ether thereof is preferably polypropylene glycol, its methyl ether, its ethyl ether, its propyl ether, or its butyl ether, more preferably polypropylene glycol, its methyl ether, its ethyl ether, its propyl ether, or its butyl ether, and even more preferably polypropylene glycol, its methyl ether, its ethyl ether, its propyl ether, or its butyl ether. Commercially available products of component (D) include Acrobute TM MB-52, Acrobute TM MB-90 (manufactured by NOF Corporation) and the like.

[0034] Component (D) can be used alone or in combination of two or more types. From the viewpoint of obtaining and maintaining a feeling of adhering to wet skin even after application to wet skin and towel drying, the content is from 0.05 to 10% by mass, preferably from 0.1 to 8% by mass, and more preferably from 0.5 to 5% by mass, of the total composition.

[0035] The mass ratio of component (D) to the total amount of components (A), (B), and (C) [(A)+(B)+(C)] is preferably (D) / [(A)+(B)+(C)]=0.05 or greater but not greater than 6, more preferably 0.2 or greater but not greater than 4, and even more preferably 0.45 or greater but not greater than 3, from the viewpoints of forming a lamellar structure in the emulsion particles in the skin cosmetic, and of obtaining and sustaining a feeling of the composition clinging to wet skin even after application to wet skin and towel drying.

[0036] Component (E) is an organic base that causes the emulsified particles in the skin cosmetic to have a lamellar structure and form a lamellar film (α-gel) on the skin, thereby providing and sustaining a feeling of adhesion to wet skin even after application to wet skin and towel drying. The organic base may be one or more selected from alkylamines having an alkyl group with 1 to 6 carbon atoms, alkanolamines having an alkyl group with 1 to 6 carbon atoms, and basic amino acids. Specifically, alkylamines having an alkyl group with 1 to 6 carbon atoms include methylamine, ethylamine, propylamine, butylamine, hexylamine, dimethylamine, diethylamine, etc. Alkanolamines having an alkyl group with 1 to 6 carbon atoms include monoethanolamine, diethanolamine, triethanolamine, N-methyl-diethanolamine, N,N-dimethylmonoethanolamine, aminomethylpropanol, etc., with aminomethylpropanol being preferred. Basic amino acids include lysine, histidine, arginine, etc., with arginine being preferred. Of the arginines, L-arginine is preferred. Among these, from the viewpoint of forming a lamellar structure for the emulsified particles in the skin cosmetic, and from the viewpoint of forming a lamellar film (α-gel) on the skin and obtaining and sustaining a feeling of sticking to wet skin even after application to wet skin and towel drying, at least one selected from alkanolamines having an alkyl group with 1 to 6 carbon atoms and basic amino acids is preferred, at least one selected from alkanolamines having an alkyl group with 3 to 6 carbon atoms and basic amino acids is more preferred, basic amino acids are even more preferred, at least one selected from aminomethylpropanol and arginine is even more preferred, and arginine is more preferred. Among arginines, L-arginine is preferred.

[0037] Component (E) can be used alone or in combination of two or more types. From the viewpoint of imparting a lamellar structure to the emulsified particles in the skin cosmetic and forming a lamellar film (α-gel) on the skin and providing and sustaining a feeling of clinging to wet skin even after application to wet skin and towel drying, the content is from 0.01 to 1.5% by mass, preferably from 0.03 to 0.5% by mass, of the total composition.

[0038] In the present invention, the mass ratio of component (E) to component (A) ((E) / (A)) is preferably 0.1 or more and 1 or less, more preferably 0.2 or more and 0.8 or less, and even more preferably 0.3 or more and 0.4 or less, from the viewpoints of forming a lamellar structure for the emulsion particles in the skin cosmetic and of forming a lamellar film (α-gel) on the skin and providing and sustaining a feeling of adhesion to wet skin even after application to wet skin and towel drying.

[0039] The skin cosmetic of the present invention preferably contains a nonionic surfactant other than the component (C), and it is preferable to contain a nonionic surfactant of component (F) having an HLB of 10 to 16 in the aqueous phase and oil phase in order to improve the compatibility of the skin cosmetic of the present invention with the skin. It is more preferable that the nonionic surfactant (F) having HLB 10 to 16 is contained in the aqueous phase at 0.01% to 1.5% by mass and in the oil phase at 0.01% to 1.5% by mass, it is even more preferable that the nonionic surfactant (F) having HLB 10 to 16 is contained in the aqueous phase at 0.1% to 1% by mass and in the oil phase at 0.1% to 1% by mass, it is even more preferable that the nonionic surfactant (F) having HLB 10 to 16 is contained in the aqueous phase at 0.2% to 0.8% by mass and in the oil phase at 0.2% to 0.8% by mass. Similarly, from the viewpoint of improving the compatibility of the skin cosmetic of the present invention with the skin, the content mass ratio (F1 / F2) of the component (F) in the aqueous phase (F1) and the oil phase (F2) is preferably 0.1 to 10, more preferably 0.5 to 5, and even more preferably 1 to 3. Here, the nonionic surfactant used in the aqueous phase and the nonionic surfactant used in the oil phase may be the same or different.

[0040] Examples of (F) nonionic surfactants having an HLB of 10 to 16 include ethylene glycol fatty acid esters such as ethylene glycol monostearate; polyethylene glycol fatty acid esters such as polyethylene glycol (2) monostearate; polyalkylene glycol alkyl ethers such as polyethylene glycol (5) decyl pentadecyl ether and polyoxyethylene (20) isocetyl ether; polyethylene glycol hydrogenated castor oils such as polyethylene glycol (5) hydrogenated castor oil and polyoxyethylene (60) hydrogenated castor oil; propylene glycol fatty acid esters; glycerin alkyl ethers such as glycerin monoisostearyl ether and glycerin monostearyl ether; fatty acid alkanolamides; fatty acid dialkanolamides such as lauric acid diethanolamide; and polyoxyethylene sorbitan monostearate. Among these nonionic surfactants, at least one selected from polyethylene glycol hydrogenated castor oil and glycerin alkyl ether is preferred. Polyethylene glycol hydrogenated castor oil is more preferred. In the present invention, the HLB value is an index showing the hydrophilic-lipophilic balance, and the value calculated by the following formula proposed by Oda and Teramura et al. is used in the present invention.

[0041] In addition, in the skin cosmetic composition of the present invention, it is preferable to contain component (G), a trivalent or higher polyol with a molecular weight of 500 or less, from the viewpoints of further improving the function of obtaining and maintaining a feeling of adhesion to wet skin even after application to wet skin and towel drying, and of suppressing the sticky feeling when sweat or water adheres to the skin after application to wet skin and towel drying, and further improving the feeling of adhesion to the skin. Examples of the component (G), trihydric or higher polyol having a molecular weight of 500 or less, include glycerin, such as diglycerin and triglycerin, and polyglycerins having a molecular weight of 500 or less. Of these, glycerin is more preferred. Component (G) is preferably contained in an amount of 1% by mass or more and 30% by mass or less, more preferably 3% by mass or more and 25% by mass or less, and even more preferably 5% by mass or more and 20% by mass or less, of the total composition, from the viewpoints of suppressing the sticky feeling when sweat or water adheres to the skin after application to wet skin and towel drying, and further improving the feeling of adhesion to the skin.

[0042] In addition, in the skin cosmetic composition of the present invention, from the viewpoints of further improving the function of obtaining and maintaining a feeling of adhesion to wet skin even after application to wet skin and towel drying, and suppressing the sticky feeling when sweat or water adheres to the skin after application to wet skin and towel drying, and further improving the feeling of adhesion to the skin, it is preferable that the skin cosmetic composition further contains, in addition to the component (G), one or more types selected from component (H) glycols having a number average molecular weight of 2000 or less and component (I) liquid hydrocarbon oil. Examples of the component (H) glycols having a number average molecular weight of 2000 or less include ethylene glycol, polyethylene glycol having a number average molecular weight of 2000 or less, propylene glycol, polypropylene glycol having a number average molecular weight of 2000 or less, butylene glycol, and the like. Component (H) is preferably contained in an amount of 0.1% by mass or more and 5% by mass or less, more preferably 0.3% by mass or more and 4% by mass or less, and even more preferably 0.5% by mass or more and 3% by mass or less, in order to suppress the sticky feeling when sweat or water adheres to the skin after application to wet skin and towel drying, and to further improve the feeling of adhesion to the skin. Component (I) liquid hydrocarbon oils include liquid paraffin, squalane, liquid petrolatum, and the like. Furthermore, from the viewpoints of suppressing the sticky feeling that occurs when sweat or water adheres to the skin after application to wet skin and towel drying, and further improving the feeling of adhesion to the skin, component (I) is preferably contained in an amount of 0.1% by mass or more and 5% by mass or less in the total composition, more preferably 0.3% by mass or more and 4% by mass or less, and even more preferably 0.5% by mass or more and 3% by mass or less.

[0043] In addition to the component (G), one or more of the components (H) and (I) may be contained. It is more preferable to use the components (G) and (H) in combination, the components (G) and (I) in combination, or the components (G), (H) and (I) in combination. When component (G) and component (H) are contained, the content mass ratio (G / H) of component (G) to component (H) is preferably 1 or more and 30 or less, more preferably 2 or more and 25 or less, and even more preferably 3 or more and 20 or less. When component (G) and component (I) are contained, the content mass ratio (G / I) of component (G) to component (I) is preferably 1 or more and 30 or less, more preferably 2 or more and 25 or less, and even more preferably 3 or more and 20 or less.

[0044] In addition, it is preferable that the skin cosmetic of the present invention contains one or more silicones selected from polyether-modified silicones and alkyl-polyether-modified silicones, from the viewpoint of imparting excellent moisture-retaining properties to the film on the skin. As the polyether-modified silicone, a compound represented by the following general formula (1) is preferable.

[0045] [ka]

[0046] (In the formula, R 1 may be the same or different, and each represents an alkyl group having 1 to 4 carbon atoms. p represents a number of 0 to 1000, and q represents a number of 1 to 1000. X 1 and X 2 may be the same or different, and each represents a hydroxyl group, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group. 2 represents a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms, or an acyl group having from 2 to 4 carbon atoms; a represents a number from 1 to 4, b represents a number from 1 to 100, and c represents a number from 0 to 50. / indicates that each structural unit to which p or q is attached and each structural unit to which b or c is attached may be random or block.

[0047] In the above general formula (1), R 1 is preferably a methyl group. X 1 and X 2 is preferably an alkyl group having 1 to 3 carbon atoms, and more preferably a methyl group. R 2 is preferably a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an acyl group having 2 to 3 carbon atoms, and more preferably a hydrogen atom.

[0048] In the above general formula (1), p is a number of 0 or more, preferably 1 or more, and 1000 or less, preferably 100 or less, more preferably 10 or less. q is a number of 1 or more, and 1000 or less, preferably 100 or less, more preferably 20 or less. In the above general formula (1), a is preferably a number of 1 or more and 3 or less. In the above general formula (1), b is a number of 1 or more, preferably 2 or more, more preferably 3 or more, and 100 or less, preferably 50 or less, more preferably 30 or less, even more preferably 15 or less, and still more preferably 8 or less. In the above general formula (1), c is a number of 0 or more and 50 or less, preferably 30 or less, more preferably 10 or less, and even more preferably 3 or less, and may be 0.

[0049] The HLB value of the compound represented by the above general formula (1) is, from the viewpoints of moisture retention, moisturizing effect, and usability, preferably 4 or more, more preferably 6 or more, even more preferably 8 or more, and even more preferably 10.5 or more, and from the same viewpoints, preferably 20 or less, more preferably 18 or less, even more preferably 16 or less, even more preferably 15 or less, and even more preferably 14.5 or less.

[0050] The HLB value of the compound represented by the above general formula (1) is calculated by the following formula. HLB value = molecular weight of polyoxyethylene in the compound represented by the general formula (1) × 20 / molecular weight of the compound represented by (b1) Furthermore, a, b, c, p, q, R 1 , R 2 , X 1 and X 2 can be determined by NMR or the like.

[0051] Alkyl-polyether modified silicones include silicones that have linear alkyl modifications or branched alkyl modifications in addition to polyether modifications such as those shown in general formula (1). The alkyl groups of the alkyl modifications include linear or branched alkyl groups having 6 to 24 carbon atoms. The silicone chain may be linear or branched.

[0052] The kinetic viscosity of the silicones (mm 2 From the viewpoints of moisture retention, moisturizing effect, and usability, the kinematic viscosity (kinematic viscosity / s) is preferably 1 or more, more preferably 5 or more, and even more preferably 10 or more, and from the same viewpoints, is preferably 1500 or less, more preferably 1000 or less, even more preferably 500 or less, and even more preferably 100 or less. Here, the kinematic viscosity is a value measured at 25° C. using an Ubbelohde viscometer (manufactured by Shibata Scientific Co., Ltd.).

[0053] As the silicones, commercially available products can be used. An example of a commercially available product is KF618 (PEG6 methyl ether dimethicone (in the formula (1), R 2 = methyl, b = 6), KF6011 (PEG 11 methyl ether dimethicone (wherein R 2 = methyl, b = 11), KF6016 (PEG 9 methyl ether dimethicone (wherein R 2 = methyl, b = 9), KF615A (PEG / PPG-27 / 9-butyl ether dimethicone (wherein R 2 = butyl, b = 20, c = 22), KF6043 (PEG10 dimethicone (in formula (1), R 2 =H, b=10) (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0054] The silicones may be used alone or in combination of two or more. From the viewpoints of moisturizing effect and usability, the content is preferably from 0.001% by mass to 4% by mass, more preferably from 0.005% by mass to 2% by mass, even more preferably from 0.005% by mass to 1.5% by mass, and even more preferably from 0.01% by mass to 1% by mass.

[0055] The skin cosmetic of the present invention may further contain an oil other than the above-mentioned components (B) and (I), thereby further enhancing the moisturizing feeling. There are no limitations on such oils, so long as they are other than the components (B) and (I) and are used in ordinary cosmetics, and they may be liquid, solid, or semi-solid at 25°C. Examples of liquid oils include ale oils such as methyl butyl ether, ethylene glycol dioctyl ether, and glycerol monooleyl ether; ester oils such as octyldodecyl myristate, isopropyl palmitate, butyl stearate, di-2-ethylhexyl adipate, neopentyl glycol dicaprate, trioctanoin, and alkyl benzoate; silicone oils such as dimethylpolysiloxane, cyclic dimethylpolysiloxane, methylphenylpolysiloxane, amino-modified silicone, carboxy-modified silicone, alcohol-modified silicone, alkyl-modified silicone, and fluorine-modified silicone; and fluorine-based oils such as perfluoroalkylethyl phosphate, perfluoroalkylpolyoxyethylene phosphate, perfluoropolyether, and polytetrafluoroethylene. These oils may also be derived from plants.

[0056] Examples of oils that are solid at 25° C. include animal waxes, vegetable waxes, mineral waxes, synthetic waxes, etc. More specifically, examples of ester waxes include rice bran wax, carnauba wax, candelilla wax, beeswax, and glomerulus wax, and examples of hydrocarbon waxes include ceresin, paraffin wax, microcrystalline wax, polyethylene wax, and polyolefin wax.

[0057] Semi-solid oils at 25℃ include cholesterol derivatives such as cholesteryl isostearate, cholesteryl hydroxystearate, cholesteryl macadamia nut oil fatty acid, and di(cholesteryl, behenyl, octyldodecyl) N-lauroyl-L-glutamate; di(phytosteryl, behenyl, 2-octyldodecyl) N-lauroyl-L-glutamate; and di(phytosteryl, 2-octyldodecyl) N-lauroyl-L-glutamate. Phytosterol derivatives such as phytosteryl isostearate, phytosteryl oleate, etc.; dipentaerythritol fatty acid esters such as dipentaerythritol hexaoxystearate, dipentaerythritol rosinate, etc.; triglycerides such as tri(caprylic-capric-myristic-stearic acid)glyceride; partially hydrogenated triglycerides such as hardened oils, lanolin, lanosterol derivatives, petrolatum, etc.

[0058] One or more types of oil agents can be used, and from the viewpoint of improving the stability of the lamellar structure formed by the composition of the present invention and from the viewpoint of moisturizing properties, the content is preferably from 0.5 to 10% by mass, more preferably from 1 to 9% by mass, and even more preferably from 2 to 8% by mass, of the total composition.

[0059] In addition to the above-mentioned components, the skin cosmetic of the present invention may contain, as appropriate, ingredients commonly used in cosmetics, such as water, thickeners, bactericides, moisturizers, humectants, colorants, preservatives, texture enhancers, powders, fragrances, anti-inflammatory agents, whitening agents, antiperspirants, ultraviolet absorbers, and antioxidants. In the skin cosmetic of the present invention, water is used as a solvent and constitutes the balance of each component, and a stable lamellar structure can be formed in the cosmetic by combining components (A) to (E). From the viewpoint of improving the stability, the content of water is preferably 60% by mass or more and 99% by mass or less, and more preferably 70% by mass or more and 95% by mass or less, of the total composition.

[0060] The skin cosmetic of the present invention can be produced by a conventional method, and is an oil-in-water emulsion cosmetic. For example, component (E) (when component (G) is added, (E) and (G), when component (H) is added, (E), (G) and (H)) is mixed with water, dissolved and homogenized at 60 to 95°C to obtain an aqueous phase. Components (A), (B), (C), (D) and (F) (when component (I) is added, components (A), (B), (C), (D), (F) and (I)) are mixed, dissolved and homogenized at 70 to 100°C to obtain an oil phase. The aqueous phase and oil phase are mixed and homogenized, and then cooled to preferably 5°C to 30°C, more preferably 10 to 28°C, and even more preferably 15 to 26°C to obtain the cosmetic. The skin cosmetic of the present invention can be further produced by the following method, and is an oil-in-water emulsion cosmetic. For example, components (E) and (F1) (components (E), (F1) and (G) when component (G) is blended, and components (E), (F1), (G) and (H) when component (H) is further blended) are mixed with water, dissolved at 60 to 95°C, homogenized, and used as an aqueous phase. Components (A), (B), (C), (D) and (F2) (components (A), (B), (C), (D), (F2) and (I) when component (I) is blended) are mixed, dissolved at 70 to 100°C, homogenized, and used as an oil phase. The aqueous phase and oil phase are mixed and homogenized, and cooled to preferably 10°C to 40°C, more preferably 15 to 35°C, and even more preferably 20 to 30°C, to produce the cosmetic.

[0061] The skin cosmetic of the present invention can be, for example, a lotion, milky lotion, cream, gel, beauty essence, etc. It can also be a sheet-like cosmetic in which the cosmetic is impregnated into or applied to a sheet-like substrate such as a woven fabric or nonwoven fabric. The skin cosmetic of the present invention can be used by applying it to the skin, preferably excluding the scalp, and more preferably to any of the face, body, hands, feet, etc. The time of use may be when the skin is wet, such as after washing the face.

[0062] The skin cosmetic of the present invention contains components (A) to (E) in specific ratios, and thus forms a lamellar structure. When applied to the skin, the water evaporates, forming a cosmetic coating film on the skin surface. The lamellar structure can be confirmed by wide-angle X-ray diffraction. EXAMPLES

[0063] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0064] Examples 1 to 14, Comparative Examples 1 to 9 Skin cosmetics having the compositions shown in Tables 1 to 5 were produced, and the presence or absence of the formation of a lamellar structure was observed. In addition, (1) the compatibility with the skin when applied to wet skin, (2) the adhesive power after application to wet skin and towel drying (immediately), (3) the durability of the adhesive power after application to wet skin and towel drying (30 minutes later), (4) the ability to suppress the sticky feeling when sweat adheres to the skin after application to wet skin and towel drying, and the boost effect of the adhesive power to the skin when water adheres to the skin after application to wet skin and towel drying, (5) the bouncy feeling of the skin after application to wet skin and towel drying, and (6) the lack of stickiness of the skin after application to wet skin and towel drying. The results are shown in Tables 1 to 5.

[0065] (Manufacturing method) The aqueous phase components including component (E) and, if necessary, components (F1), (G) and (H) were stirred and dissolved at 70 to 80° C. to obtain an aqueous phase. Next, the oil phase components including components (A), (B), (C), (D), (F2) and, if necessary, component (I) were stirred and dissolved at 85 to 95° C. to obtain an oil phase. The oil phase was added to the aqueous phase while stirring at 85 to 95° C., and the mixture was cooled to room temperature (25° C.) while stirring to produce a skin cosmetic (oil-in-water emulsion cosmetic).

[0066] (Evaluation method) (1) Ease of application to wet skin Ten expert panelists washed the inside of their forearms, gently pressed the skin with a Kimtowel to wipe off any water droplets on the skin surface, and applied 0.002g / cm2 of each skin cosmetic product. The skin's compatibility with the product was evaluated. 〇; familiar ×: Unfamiliar

[0067] (2) Adhesiveness after application to wet skin and towel drying (immediately), (3) Duration of adhesiveness after application to wet skin and towel drying (after 30 minutes) After washing the inside of the forearm, the skin was lightly pressed with a Kimtowel to wipe off any water droplets on the surface, and each skin cosmetic was applied at 0.002 g / cm2. After lightly pressing twice with the Kimtowel, the adhesive strength was evaluated using a Handy Lab Tester (Trinity Labs) in terms of tack value (load: 200 gf ± 20 gf, probe: 2 cm diameter, stainless steel). The tack value was measured by pressing the probe vertically against the horizontally placed inside of the forearm until the load reached 200 gf, and then releasing the probe. ◎◎:-32gf or less ◎:-31gf~-24gf ○:-23gf~-16gf △:-15gf~-8gf ×: -7gf or more

[0068] (4) The ability to suppress stickiness when sweat adheres to wet skin after application to wet skin and towel drying, and the ability to boost adhesion to the skin when water adheres to the skin after application to wet skin and towel drying After washing the inside of the forearm, the skin was lightly pressed with a Kimtowel to wipe off water droplets from the surface, and each skin cosmetic was applied at 0.002 g / cm2. The skin was lightly pressed twice with a Kimtowel, and then 30 minutes after application, water was applied at 0.002 g / cm2. Five minutes later, the adhesive strength was evaluated using a Handy Lab Tester (manufactured by Trinity Labs) in terms of tack value (load: 200 gf ± 20 gf, probe: 2 cm diameter, stainless steel). The tack value was measured by pressing the probe vertically against the horizontally placed inside of the forearm until the load reached 200 gf, and then releasing the probe. ◎◎:-32gf or less ◎:-31gf~-24gf ○:-23gf~-16gf △:-15gf~-8gf ×: -7gf or more

[0069] (5) When applied to wet skin, the skin feels soft and supple after towel drying Ten expert panelists washed the inside of their forearms, gently pressed them with a Kimtowel to wipe off any water droplets on the skin surface, and applied 0.002g / cm2 of each skin cosmetic. They lightly pressed the Kimtowel from above twice. After 5 minutes, they pressed the inside of their forearms up and down with their hands twice, rated the bouncy feeling, and calculated the average value. 5; Very chewy 4. It has a chewy texture. 3; Slightly chewy 2. Not very chewy 1; No chewy texture

[0070] (6) When applied to wet skin, the skin does not feel sticky after towel drying. Ten expert panelists washed the inside of their forearms, gently pressed the skin with a Kimtowel to wipe off any water droplets on the skin surface, and applied 0.002g / cm2 of each skin cosmetic. The panelists gently pressed the Kimtowel twice from above. After 5 minutes, the panelists ran their hands back and forth across the inside of their forearms to evaluate whether the skin felt sticky, and calculated the average value. 5. Almost non-sticky 4; Non-sticky 3. Not too sticky 2; Slightly sticky 1; Sticky

[0071] [Table 1]

[0072] [Table 2]

[0073] [Table 3]

[0074] [Table 4]

[0075] [Table 5]

[0076] As can be seen from Tables 1 to 5, the skin cosmetic preparation of the present invention forms a lamellar film on the skin, and even after application to wet skin and towel drying, it provides a feeling of adhering to the wet skin, and this effect is sustained. In addition, the skin also has a good feel when applied to wet skin, such as good compatibility with the skin when applied, a bouncy feeling after application to wet skin and towel drying, and no stickiness on the skin.

Claims

1. An oil-in-water type emulsified skin cosmetic containing the following components (A), (B), (C), (D) and (E). (A) An anionic surfactant: 0.05% by mass or more and 3% by mass or less, (B) A higher alcohol: 0.1% by mass or more and 6% by mass or less, (C) One or more compounds selected from glycerin monofatty acid ester, glycerin difatty acid ester, sorbitan monofatty acid ester and sorbitan difatty acid ester: 0.3% by mass or more and 12% by mass or less, (D) M calculated from the chromatogram determined by gel permeation chromatography measurement Ｈ and M Ｌ wherein polypropylene glycol or its lower alkyl ether satisfying the relationship of formula (1) is 0.05% by mass or more and 10% by mass or less 【Number 1】 (In formula (1), let the length of the perpendicular line from the maximum point K where the refractive index intensity on the chromatogram is maximum to the baseline B be L, and among the two points on the chromatogram where the refractive index intensity is L / 2, let the point with the earlier elution time be point O and the point with the later elution time be point Q. When the intersection point of the straight line G connecting point O and point Q and the perpendicular line drawn from the maximum point K to the baseline is P, the distance between point O and the intersection point P is M Ｈ is defined as, and the distance between point Q and the intersection point P is M Ｌ is defined as) (E) An organic base: 0.01% by mass or more and 1.5% by mass or less

2. The oil-in-water type emulsified skin cosmetic according to Claim 1, further containing a nonionic surfactant having an HLB of 10 to 16 on the aqueous phase side and the oil phase side.

3. The oil-in-water type emulsified skin cosmetic according to Claim 2, containing 0.01% by mass or more and 1.5% by mass of a nonionic surfactant having an HLB of 10 to 16 on the aqueous phase side and 0.01% by mass or more and 1.5% by mass or less on the oil phase side.

4. The oil-in-water type emulsified skin cosmetic according to Claim 1 or 2, further containing a polyol having a trivalent or higher valence and a molecular weight of 500 or less as component (G).

5. The oil-in-water type emulsified skin cosmetic according to Claim 4, further containing one or more selected from component (H) glycols having a number average molecular weight of 2000 or less and component (I) liquid hydrocarbon oils.

6. In the gel permeation chromatography, component (D) has a chromatogram represented by the refractive index intensity and the elution time obtained using a differential refractometer that is asymmetric left and right, and the asymmetry value As of the peak of the chromatogram obtained as follows satisfies the relationships of the following formulas (2) and (3). The oil-in-water type emulsified skin cosmetic according to Claim 1 or 2. 【Number 2】 (In formula (2), among the two points on the chromatogram where the refractive index intensity becomes L / 20, the point with the earlier elution time is point R, the point with the later elution time is point S, the intersection of the straight line H connecting point R and point S and the perpendicular line drawn from the maximum point K to the baseline B is point T, the distance between point R and intersection point T is W1 / 2, and the distance between point R and point S is W5%).

7. The oil-in-water type emulsified skin cosmetic according to Claim 1 or 2, wherein the average number of added moles of oxypropylene groups in the polypropylene glycol of component (D) is 50 or more and 250 or less.

8. The oil-in-water type emulsified skin cosmetic according to claim 1 or 2, wherein the component (E) is one or more selected from alkylamines having an alkyl group with 1 to 6 carbon atoms, alkanolamines having an alkyl group with 1 to 6 carbon atoms, and basic amino acids.

Images