Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water type emulsion cosmetic which maintains a stable emulsion state with time by suppressing aggregation of micro-emulsified particles in a nanoemulsion in an oil-in-water type emulsion cosmetic having transparent appearance and has a high additional value without excessive oily feeling and sense of incompatibility after applying to the skin even though an oily component is highly blended so that a ratio of an inner phase containing an oily component is 25 mass% or more.SOLUTION: There is provided a transparent or translucent oil-in-water type emulsion cosmetic which comprises an oily component (A), a non-ionic surfactant (B) including a polyglycerol fatty acid ester (B1) having an HLB of 10 or more and 0.1 to 3.0 mass% of an anionic surfactant (C) and an aqueous component (D) as essential components, wherein since the ratio of an inner phase containing the oily component (A), the non-ionic surfactant (B) and the anionic surfactant (C) is adjusted to 25 to 45 mass%, emulsified particles in close contact are hardly agglomerated because the electrostatic repulsive force due to surface charge and zeta potential of emulsion particles is sufficient and the dispersion state of a nanoemulsion is stabilized over a long period of time.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a transparent or translucent oil-in-water emulsion cosmetic. [Background technology]

[0002] In order to provide oil-in-water emulsion cosmetics, such as moisturizing creams, with the function of preventing dryness of the skin, it is desirable for water and oil, which are incompatible with each other, to coexist and be blended in a balanced manner, and therefore oil-in-water or water-in-oil emulsion forms are used.

[0003] A typical moisturizing cream is made of an emulsion composition in which the average particle size of the emulsion particles is larger than the wavelength of visible light (380 to 780 nm), and which has a cloudy appearance.

[0004] Development has been made to improve such conventional emulsion compositions by imparting transparency or translucency to give them a refreshing and fresh appearance. For example, cosmetics comprising oil-in-water emulsion compositions in which the oil content of moisturizing creams has been solubilized, or which have been converted into microemulsification or transparent gel emulsions using liquid crystals are well known.

[0005] For example, in order to impart transparency to cosmetics such as moisturizing creams made from emulsion compositions, it has been necessary to reduce the oil content to, for example, about 5% or less, and it has also been necessary to incorporate large amounts of surfactants, higher alcohols, waxes, etc. (Patent Document 1).

[0006] Also known is a translucent skin care cosmetic that contains an oil-in-water emulsion containing emulsified particles with an average particle size of approximately 20 nm to 3 μm, and that is a blend of a specific low-viscosity diester oil called diisostearyl malate and 15% by mass or less of hardened castor oil (hydrogenated castor oil), a nonionic surfactant with no particular HLB value restrictions (Patent Document 2).

[0007] Furthermore, a gel-like hair cosmetic composition with a transparent appearance is known, which is composed of an O / W fine emulsion containing a nonionic surfactant and a cationic surfactant and has a particle size of 10 to 500 nm (Patent Document 3). Incidentally, such an emulsion composition is one in which one of the liquid phases, which are insoluble in each other, is dispersed as fine droplets in the other, and the dispersed emulsion particles are referred to as the "internal phase," while the medium in which the emulsion particles are dispersed is referred to as the "external phase." However, there are various opinions as to whether or not the surfactant contained in such an emulsion composition should be included in the "internal phase," and therefore, hereinafter, when we refer to the "internal phase," we mean not only the oily components but also surface-active components such as nonionic surfactants and anionic surfactants. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-254670 [Patent Document 2] Japanese Patent Publication No. 2020-002102 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-121839 Summary of the Invention [Problem to be solved by the invention]

[0009] Incidentally, the skin care cosmetic described in Patent Document 2 does not specify the ratio of the internal phase containing the oily component, and is an emulsion consisting of emulsified particles with an average particle size of 20 nm to 3 μm, which is a wide range of particle sizes from nano-units to micron-units. Therefore, when the ratio of the internal phase is high, for example, 25% by mass or more, and particularly when the content ratio of the oily component is 15% by mass or more, it is difficult to stabilize over time a non-coalescing emulsified state that does not cause aggregation of tiny emulsified particles with a particle size of 100 nm or less in nano-units.

[0010] Furthermore, the gel-type hair cosmetic described in Patent Document 3 uses a cationic surfactant in addition to a nonionic surfactant when preparing a microemulsion, taking into consideration the adsorption onto hair, and then converts this into a nanoemulsion, and in the final step, the desired emulsion with a high internal phase is obtained. However, in paragraph

[0044] of Patent Document 3, it is stated that "when generating a microemulsion, The amount of oil (component C) in the hair cosmetic is preferably 0.001 to 5% by mass" (paragraph

[0045] ), and the amount of oil (component C) in the final gel-type hair cosmetic product was extremely small.

[0011] Furthermore, so-called nanoemulsions have extremely small emulsified particles with an average particle size of less than 1 μm and an extremely large particle surface area. Therefore, the interfacial energy is large and Brownian motion occurs, and compared to microemulsions, which are swollen micelles and thermodynamically stable, the emulsified particles are more likely to coalesce, making it difficult to stably maintain the minute particle size and the resulting transparency over time.

[0012] Therefore, an object of the present invention is to provide an oil-in-water emulsion cosmetic that has a transparent appearance, in which the emulsified state is stably maintained over time by suppressing coalescence of minute emulsified particles in a nanoemulsion state, and which, despite the incorporation of oily components, surfactants, etc. such that the proportion of the internal phase containing the oily component (A) etc. is 25 mass % or more, has a fresh feel when applied to the skin, and is free of any discomfort such as excessive oiliness or stickiness or a filmy feeling after application. [Means for solving the problem]

[0013] In order to solve the above problems, the present invention provides an oil-in-water emulsion cosmetic comprising a transparent or translucent oil-in-water emulsion composition containing, as essential ingredients, an oily component (A), a nonionic surfactant (B) containing a polyglycerol fatty acid ester (B1) with an HLB of 10 or higher, 0.1 to 3.0 mass% of an anionic surfactant (C), and an aqueous component (D), wherein the proportion of the internal phase containing the oily component (A), nonionic surfactant (B), and anionic surfactant (C) is 25 to 45 mass%.

[0014] In the oil-in-water emulsion cosmetic of the present invention configured as described above, when the content of oily component (A) is high, such as 15% by mass or more, the oily component (A) is emulsified with the specific nonionic surfactant (B), and fine emulsion particles are dispersed in water to produce a transparent or translucent cosmetic.

[0015] When the ratio of the internal phase is 25 to 45% by mass, the oil-in-water emulsion cosmetic of the present invention contains 0.1 to 3.0% by mass of an anionic surfactant (C) in addition to a nonionic surfactant (B) containing a hydrophilic polyglycerol fatty acid ester (B1) with an HLB of 10 or higher. Therefore, even when the emulsion particles are close together so that the average interparticle distance is extremely short, there is sufficient electrostatic repulsion due to the surface charge and zeta potential, making it difficult for the close-coupled emulsion particles to coalesce, and the dispersion state of the nanoemulsion remains stable for an extended period of time. Such oil-in-water emulsion cosmetics have an oily feel suppressed because the oily components are trapped in fine emulsion particles dispersed in water, resulting in a fresh, moist feel when applied.

[0016] The nonionic surfactant (B) sufficiently emulsifies the oily component (A) by using the hydrophilic polyglycerol fatty acid ester (B1) with an HLB of 10 or more, and also increases the binding strength of the water molecules on the surface of the emulsified particles. This increases the binding strength of the water molecules by the emulsified particles, thereby improving the gel strength.

[0017] Furthermore, if the nonionic surfactant (B) contains a lipophilic glycerin fatty acid ester (B2) with an HLB of 6 or less, the emulsion particles will be tiny, on the nanoscale, with a particle size of 100 nm or less, and even if the emulsion interface has a high curvature, a stable emulsion interface film can be formed and maintained accordingly.

[0018] In order to fully exert such an effect, the nonionic surfactant (B) is preferably a nonionic surfactant (B) containing a glycerin fatty acid ester (B2) having an HLB of 6 or less.

[0019] Furthermore, this oil-in-water emulsion cosmetic contains a high amount of oily components, so that the internal phase ratio, i.e., internal phase / (internal phase + external phase) × 100 (% by mass), is 25% by mass or more. Nevertheless, the oil-in-water emulsion cosmetic of this invention is prevented from becoming unstable due to emulsion coalescence by containing the nonionic surfactant (B). In this way, oil-in-water emulsion cosmetics do not require the incorporation of commonly used high-viscosity thickeners, and when applied to the skin, they do not produce an unpleasant sticky film feeling due to thickeners, and do not give the user an excessively oily feeling or an uncomfortable feeling after application.

[0020] The glycerin fatty acid ester (B2) having an HLB of 6 or less is preferably a polyglycerin fatty acid ester or a monoglycerin fatty acid ester, or a glycerin fatty acid ester (B2) consisting of both of these, in order to fully exert the above-mentioned effects.

[0021] In order to fully obtain the above-mentioned effects, it is preferable that the polyglycerol fatty acid ester (B1) component having an HLB of 10 or more is 0.5 to 12 mass % and the glycerol fatty acid ester (B2) component having an HLB of 6 or less is 0.5 to 5.0 mass %. For the same reasons as above, it is preferable that the anionic surfactant (C) is an acylamino acid salt or a phosphate fatty acid ester salt.

[0022] The oil-in-water emulsion composition is preferably a cream-like oil-in-water emulsion composition in which emulsified particles having a particle size of 20 to 100 nm are dispersed, so that the oil-in-water emulsion composition is sufficiently transparent or translucent and exhibits a transparent appearance as a high-value-added cosmetic. [Effects of the Invention]

[0023] This invention provides an oil-in-water emulsion cosmetic that exhibits a transparent appearance and is composed of an oil-in-water emulsion composition containing, as essential ingredients, an oily component (A), a nonionic surfactant (B) containing a polyglycerol fatty acid ester (B1) with a specified HLB value, a specified amount of anionic surfactant (C), and an aqueous component (D), so that the proportion of the internal phase is high. This inhibits aggregation of the emulsion microparticles, and the emulsified state of the nanoemulsion is stably maintained over time. Moreover, despite the high oily component content, such as the proportion of the internal phase containing the oily component (A) or the like being 25% by mass or more, the cosmetic has a refreshing feel when applied to the skin, and is free of any discomfort such as excessive oiliness or stickiness or a filmy feeling after application, resulting in a highly added-value oil-in-water emulsion cosmetic. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a graph showing the relationship between the amount of transmitted light and the amount of anionic surfactant in Examples 1 to 6, and the relationship between the amount of transmitted light and the internal phase ratio in Examples 4, 7, and 8 and Comparative Examples 1 and 2. [Figure 2] Graph showing the relationship between the average interparticle distance and the amount of anionic surfactant in Examples 1 to 6 [Figure 3] Graph showing the relationship between the average interparticle distance and the internal phase ratio in Examples 4, 7, and 8 and Comparative Examples 1 and 2 [Figure 4] Graph showing the relationship between R2sp (binding ability of water molecules) and the amount of anionic surfactant for emulsified particles of Examples 1 to 6 [Figure 5] Graph showing the relationship between R2sp (binding property of water molecules) and internal phase ratio of emulsion particles of Examples 4, 7, and 8 and Comparative Examples 1 and 2 [Figure 6] Schematic diagram illustrating the electric double layer of adjacent emulsion particles [Figure 7]Transmission electron microscope photograph of Example 4 using the freeze-fracture replica method DETAILED DESCRIPTION OF THE INVENTION

[0025] An embodiment of the oil-in-water emulsion cosmetic according to the present invention comprises an oil-in-water emulsion composition that is transparent and does not become cloudy even when diluted, and this oil-in-water emulsion composition essentially comprises an oil component (A), a nonionic surfactant (B) containing a polyglycerol fatty acid ester (B1) with an HLB of 10 or more, 0.1 to 3.0 mass% of an anionic surfactant (C), and an aqueous component (D), and the proportion of the internal phase containing the oil component (A), nonionic surfactant (B), and anionic surfactant (C) in the emulsion particles is 25 to 45 mass%.

[0026] The oily component (A) used in this invention is not particularly limited as long as it is a cosmetic oil that can inhibit water evaporation from the skin, maintain moisture, and keep the skin soft. For example, hydrocarbon oils such as α-olefin oligomers, silicone oils such as squalane and dimethylpolysiloxane, and other well-known emollient oils that can be used as substitutes for sebum can be used.

[0027] By setting the ratio of the internal phase containing the oily component (A) to 25 to 45% by mass, it is possible to obtain a cosmetic preparation with excellent emollient properties that can sufficiently suppress water evaporation from the skin, maintain moisture, and keep the skin soft.

[0028] The oil-in-water emulsion cosmetic of the present invention has an average interparticle distance of 50 nm or less among emulsion particles, and is composed of an emulsion composition with a predetermined internal phase ratio that retains the above-mentioned sufficient oil component.

[0029] The nonionic surfactant (B) used in the present invention is a nonionic surfactant containing a polyglycerol fatty acid ester (B1) having an HLB of 10 or more, preferably an HLB of 12 or more.

[0030] Incidentally, polyglycerol fatty acid esters can be synthesized with a wide range of HLB values, from hydrophilic to lipophilic, by changing the combination and ratio of polyglycerols with different degrees of polymerization and various fatty acids, such as fatty acid chain lengths and saturated or unsaturated fatty acids.

[0031] Examples of the polyglycerol fatty acid ester (B1) having an HLB of 10 or more include polyglyceryl myristate and polyglyceryl stearate.

[0032] Furthermore, when the nonionic surfactant (B) contains a glycerin fatty acid ester (B2) having an HLB of 6 or less, a monoglycerin fatty acid ester such as glyceryl monoisostearate, a polyglycerin fatty acid ester, or a glycerin fatty acid ester (B2) consisting of both can be used.

[0033] The blending ratio of the polyglycerol fatty acid ester (B1) component having an HLB of 10 or more is preferably 0.5 to 12% by mass. A small amount less than 0.5% by mass is insufficient for the amount required for orientation at the interface of the emulsion particles, making it difficult to prepare an oil-in-water emulsion composition composed of fine, transparent emulsion particles. A blending amount exceeding 12% by mass is also undesirable because it makes it difficult to prepare fine emulsion particles.

[0034] The blending ratio of the glycerin fatty acid ester (B2) component with an HLB of 6 or less used in this invention is preferably 0.5 to 5.0% by mass. This is because a small amount less than 0.5% by mass results in minute emulsion particles with a particle diameter of 100 nm or less, which is not preferable because it is not possible to form and maintain a stable emulsion interface film sufficiently when the emulsion interface has a high curvature. Furthermore, blending a large amount exceeding 5.0% by mass is not preferable because it does not improve the desired effect as described above and makes it difficult to prepare minute emulsion particles.

[0035] The anionic surfactant (C) used in this invention is added to exert the effect of sufficiently increasing the electrostatic repulsive force due to the surface charge and zeta potential, even when the emulsion particles are brought close together so that the average interparticle distance is extremely short.

[0036] To achieve this effect, anionic surfactants well known as cosmetic ingredients can be used, including, for example, phosphate fatty acid ester salts such as potassium hexadecyl phosphate (potassium cetyl phosphate) or acylamino acid salts.

[0037] Acylamino acid salts are acid amide-type anionic surfactants composed of amino acids and fatty acids, and are obtained by the acylation reaction of amino acids with fatty acid chlorides. Representative examples include N-acylglutamate, N-acylglycine, and N-acylsarcosine salts, as well as their sodium salts, ammonium salts, and alkanolamine salts.

[0038] The above-mentioned effects can be fully achieved by blending 0.1 to 3.0% by mass of such an anionic surfactant (C). A blending ratio of less than 0.1% by mass is undesirable because closely spaced emulsified particles tend to coalesce, while blending a large amount exceeding 3.0% by mass does not further improve the above-mentioned effects, so the above range is preferable from the viewpoint of addition efficiency. [Example]

[0039] [Examples 1 to 8, Comparative Examples 1 and 2] The oil-in-water emulsion cosmetics of the Examples and Comparative Examples can be used in moisturizing creams, skin care cosmetics, etc., and were prepared by high-pressure emulsification (200 MPa) using the essential ingredients (A) to (D) and other ingredients listed below, blended to obtain the compositions shown in Table 1. The obtained Examples had a soft gel-like structure with a jelly hardness (25°C) of 10 to 140 g, while Comparative Examples 1 and 2 had the appearance of a viscous fluid. (A) Oily component: α-olefin oligomer, dimethylpolysiloxane, (B) Nonionic surfactants: (B1) Polyglycerin fatty acid esters with HLB of 10 or more: polyglyceryl myristate (HLB: 12.2) and polyglyceryl stearate (HLB: 12.9) (B2) Glycerin fatty acid esters with an HLB of 6 or less: diglyceryl monoisostearate (HLB: 5.5) (C) Anionic surfactant: Cetyl phosphate K (hexadecyl hydrogen phosphate = potassium) (D) Aqueous components: glycerin, water (Other ingredients) Emulsifier: Monooleyl glyceryl ether Preservative: Methylparaben Antioxidant: Tocopherol

[0040] [Table 1]

[0041] To examine the transparency and the coalescence of the emulsified particles of the nanoemulsions obtained in the Examples and Comparative Examples, the transmittance, particle size, average interparticle distance and zeta potential of the emulsified particles, as well as the surface potential and R2sp (binding property of water molecules) were evaluated by the following test methods.

[0042] [Transparency] The transmittance (T%) of the Examples and Comparative Examples to visible light (625 nm) was measured using a spectrophotometer. As is clear from the results shown in Figure 1, all of the Examples and Comparative Examples were transparent regardless of whether the internal phase ratio or the amount of anionic surfactant blended was changed. However, Examples 1 to 8, which had an internal phase ratio (internal / external phase ratio) of 28.7 mass% or more, were confirmed to have higher transparency (transmittance of 65% or more) than Comparative Examples 1 and 2. Note that these Examples were closed emulsions that did not break down even when diluted to a 10% aqueous solution, and transparency did not decrease.

[0043] [Particle size and average interparticle distance of emulsified particles] For the Examples and Comparative Examples, particle size and average interparticle distance were measured by small-angle X-ray scattering (SAXS) using a SAXSpace (Anton Paar, Austria) equipped with a Mythen R 1k detector. X-ray irradiation was performed at a wavelength of k = 0.1542 nm (Cu-Kα), 50 kV, and 40 mA. Scattering data was analyzed using the generalized indirect Fourier transform (GIFT) method. This method is based on the simultaneous determination of shape and structure factors. From these results, particle size and average interparticle distance were calculated. The results are shown in Table 2, and the relationship between average interparticle distance and anionic surfactant content (mass%) for Examples 1 to 6 is shown in Figure 2. Figure 6 shows a model of two adjacent emulsified particles, with the particle diameter a and average interparticle distance b indicated by symbols, and symbol c indicating the thickness of the ion diffusion layer, including the zeta potential from the surface potential of the emulsified particles.

[0044] As is clear from the results shown in FIG. 2, it was found that the average interparticle distance b of the emulsified particles becomes closer when the amount of anionic surfactant (mass %) increases within the range of 0.1 to 0.9.

[0045] [Zeta potential and surface potential of emulsified particles] The zeta potential and surface charge of the examples and comparative examples were measured by ultrasonic attenuation spectroscopy (UAS) using an ultrasonic attenuation spectrometer DT-1202 (Dispersion Technology, USA). The results are shown in Table 2.

[0046] [Table 2]

[0047] As is clear from the results shown in Table 2, it was confirmed that both the Examples and Comparative Examples had a zeta potential at a level required for particle dispersion (25 mV or more in absolute value). 3 shows the relationship between the average interparticle distance and the internal phase ratio for Examples 4, 7, and 8 and Comparative Examples 1 and 2. As a result, it was confirmed that the average interparticle distance became closer as the internal phase ratio increased from 28.7 to 40.18 mass%.

[0048] [R2sp (binding property of water molecules)] To investigate the bonding characteristics of water molecules at the particle interface in the examples and comparative examples, pulsed NMR measurements were performed to examine changes in the relaxation rate (R2sp). The relaxation rate indicates the degree of molecular motion when hydrogen nuclei are subtly perturbed by local and external magnetic interactions, and R2sp is an index that directly observes the extent of the interface between the particle (droplet) and the liquid.

[0049] Liquid and solid 1 H spin-spin relaxation (T2) time measurements were performed using a 13.3 MHz NMR Acorn Area (XiGo Nanotools, USA) with a Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence. The results are shown in Figures 4 and 5.

[0050] As is clear from the results shown in Figures 4 and 5, it is clear that as the anionic surfactant ratio increases within a certain range, the binding strength of water molecules weakens (Figure 4), and as the internal phase ratio increases, the binding strength of water molecules increases (Figure 5).

[0051] For Example 4, freeze-fracture replica transmission electron microscope (FF-TEM) observation was performed to confirm the particle size and packing state, and it was confirmed that particles of approximately 20 to 40 nm were uniformly packed (Figure 7).

[0052] Furthermore, the particle size a and average interparticle distance b shown in FIG. 6 are consistent with the average particle size and average interparticle distance of Example 4 shown in Table 2. This suggests that the overlapping of the electric double layers cancels out part of the zeta potential, and particle dispersion is maintained by the repulsive force of the surface charge and the zeta potential. From the above measurement and observation results, it is clear that the emulsion is very stable even though the electric double layers of the particles are in close proximity to each other.

[0053] Furthermore, as mentioned above, when the amount of anionic surfactant (mass%) increases from 0.1 to 0.9, the average interparticle distance of the emulsified particles decreases. In addition, the results shown in Tables 1 and 2 indicate that the surface charge of the particles does not change significantly even if the amount of anionic surfactant increases beyond a certain level, suggesting that there is a limit to the amount of anionic surfactant that can be distributed on the particle surface. Furthermore, excessive amounts of anionic surfactant may cause interactions by forming micelles or other structures in the gaps between particles, which may affect gel strength.

[0054] As shown in Figures 2 and 3, by adjusting the amount of anionic surfactant and the internal phase ratio to a predetermined level, it was thought that even if the average interparticle distance was shortened, that is, the degree of packing was increased and the particles were brought closer to each other, sufficient surface charge was imparted to maintain the zeta potential and the dispersed state.

[0055] Furthermore, as shown in Figure 5, it was confirmed that the binding strength of water molecules on the particle surface also increased as the internal phase ratio increased. Therefore, it was thought that increasing only the internal phase ratio without changing the particle composition would increase the number of particles, thereby increasing the surface area and increasing the binding strength of water molecules, thereby contributing to improving the gel strength.

[0056] In this manner, when the internal phase ratio is as high as 25 to 45% by mass, a predetermined amount of anionic surfactant (C) is used in combination with nonionic surfactant (B) containing hydrophilic polyglycerol fatty acid ester (B1) with a predetermined HLB value. Therefore, even when the emulsion particles are brought close together so that the average interparticle distance becomes extremely short, the electrostatic repulsion force due to the surface charge and zeta potential is sufficient, making it difficult for the close emulsion particles to coalesce, and the dispersion state of the nanoemulsion is stable for a long period of time. It was also found that the oily component (A) in the internal phase can be dispersed even when the distance between emulsified particles (average interparticle distance) is close enough to bring the electric double layers of the particles into close proximity.

Claims

1. The oil-in-water emulsion cosmetic comprises a transparent or translucent oil-in-water emulsion composition containing, as essential ingredients, an oily component (A), a nonionic surfactant (B) containing a polyglycerol fatty acid ester (B1) having an HLB of 10 or more, 0.1 to 3.0 mass% of an anionic surfactant (C), and an aqueous component (D), in which emulsified particles having a particle diameter of 20 to 100 nm are dispersed at an average interparticle distance of 50 nm or less, and in which the proportion of an internal phase containing the oily component (A), the nonionic surfactant (B), and the phosphate fatty acid ester salt that is the anionic surfactant (C) is 25 to 45 mass%.

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of the oily component (A) is 15% by mass or more.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the nonionic surfactant (B) containing the polyglycerol fatty acid ester (B1) having an HLB of 10 or more is a nonionic surfactant (B) that also contains a glycerol fatty acid ester (B2) having an HLB of 6 or less.

4. 4. The oil-in-water emulsion cosmetic according to claim 3, wherein the glycerin fatty acid ester (B2) having an HLB of 6 or less is a polyglycerin fatty acid ester, a monoglycerin fatty acid ester, or a glycerin fatty acid ester (B2) consisting of both polyglycerin fatty acid ester and monoglycerin fatty acid ester.

5. 5. The oil-in-water emulsion cosmetic according to claim 3, wherein the polyglycerol fatty acid ester (B1) component having an HLB of 10 or more is contained in an amount of 0.5 to 12% by mass, and the glycerol fatty acid ester (B2) component having an HLB of 6 or less is contained in an amount of 0.5 to 5.0% by mass.

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