JP2021155371A - Oil-in-water type emulsion composition - Google Patents

Abstract

To provide a composition having high formulation stability in an oil-in-water type emulsion composition in which an ester oil or a vegetable oil is used as an oil agent.SOLUTION: There is provided an oil-in-water type emulsion composition which comprises the following components (A) to (D): (A) at least one selected from the group consisting of an ester oil which is liquid at 25°C and a vegetable oil which is liquid at 25°C, (B) a polyoxyethylene hardened castor oil having an ethylene oxide average addition molar number of 20 to 30, (C) one or more selected from sorbitan monoisostearate and sorbitan diisostearate and (D) water, wherein the content mass ratio (B)/(C) of the component (B) to the component (C) is more than 1 and less than 20 and the average particle diameter of emulsion particles is 300 nm or less.SELECTED DRAWING: None

Description

The present invention relates to an oil-in-water emulsified composition.

In general, an oil-in-water emulsified composition has a continuous phase composed of an aqueous component, so that when used as a cosmetic, (1) a light and smooth spread and a refreshing feel can be obtained (2). ) It is relatively easy to manufacture, (3) it is not easily affected by temperature, (4) by changing the type and amount of oil, it is possible to change the feel and properties in various ways and to make it spread. It has such characteristics.

Of the oil-in-water emulsified compositions, ester oils and vegetable oils may be used as oils. Attempts have also been made to reduce the particle size of emulsified droplets in an oil-in-water emulsified composition using vegetable oil or the like.

For example, Patent Document 1 discloses a technique for reducing the emulsion particle size to 5 μm or less by using a viscous substance such as a glutamic acid polypeptide and a surfactant containing a polyhydroxy compound. Since vegetable oils and the like have high polarity, it is difficult to obtain a stable oil-in-water emulsified composition. With the above configuration, it is possible to make the emulsion particle size into fine particles of 5 μm or less. It is supposed to be.

Japanese Unexamined Patent Publication No. 11-18696

However, even in the technique disclosed in Patent Document 1, the stability of the oil-in-water emulsified composition cannot be said to be sufficient, and there is room for improvement.

Therefore, an object of the present invention is to provide an oil-in-water emulsified composition using an ester oil and / or a vegetable oil as an oil agent, which has high formulation stability (emulsification stability and stability over time). And.

Another object of the present invention is to provide an oil-in-water emulsified composition capable of imparting a glossy feeling to the skin when applied to cosmetics.

In the present invention, the following components (A) to (D): (A) At least one selected from the group consisting of an ester oil liquid at 25 ° C. and a vegetable oil liquid at 25 ° C., (B) average addition of ethylene oxide. One or more selected from polyoxyethylene hydrogenated castor oil having a number of moles of 20 to 30, (C) sorbitan monoisostearate, and sorbitan diisostearate, (D) containing water, and component (B) with respect to component (C). An oil-in-water emulsified composition having a mass ratio (B) / (C) of more than 1, less than 20, and an average particle size of emulsified particles of 300 nm or less.

According to the present invention, even when an ester oil or a vegetable oil is used as an oil agent, the emulsification stability is high immediately after production and over time. Further, when the oil-in-water emulsified composition is applied to the skin as a cosmetic, it is possible to impart a glossy feeling to the skin.

Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments. In the present specification, "X to Y" indicating a range includes X and Y and means "X or more and Y or less". Unless otherwise specified, operations and physical properties are measured under the conditions of room temperature (20 to 25 ° C.) / relative humidity of 40 to 50% RH.

One embodiment of the present invention comprises at least one selected from the group consisting of the following components (A) to (D): (A) liquid ester oil at 25 ° C. and liquid vegetable oil at 25 ° C., (B). One or more selected from polyoxyethylene hydrogenated castor oil having an average addition molar number of ethylene oxide of 20 to 30, (C) sorbitan monoisostearate, and sorbitan diisostearate, (D) containing water and relative to component (C). An oil-in-water emulsified composition in which the content mass ratio (B) / (C) of the component (B) is more than 1, less than 20, and the average particle size of the emulsified particles is 300 nm or less.

When emulsification of the oil-in-water type using the ester oil liquid at 25 ° C. and / or the vegetable oil liquid at 25 ° C. (hereinafter, also simply referred to as ester oil) of the component (A), the formulation is stable as described above. It tends to be unstable. However, by combining the component (B) and the component (C) and setting the average particle size of the emulsified particles to 300 nm or less, initial stability and stability over time can be ensured. This is because the average particle size of the emulsified particles is sufficiently small, 300 nm or less, so that the initial stability is ensured, and the combination of the component (B) and the component (C) is the interface of the oil droplet containing ester oil or the like. It is considered that this is because the stability can be maintained and the stability over time is maintained. The emulsification stability of oil-in-water emulsification oils is often examined based on the HLB balance of the surfactant, but in fine emulsification of ester oils and the like, the emulsification stability is determined only by the HLB balance of the surfactant. The present inventors have found that is not guaranteed. Then, they have found that the types of activators and their combinations are important for the stability of fine emulsions such as ester oils, and among the various activators, the component (B) and the component (C) ) Are found to be extremely important.

Further, by setting the average particle size of the emulsified particles to 300 nm or less, when applied as a cosmetic, the permeability to the skin is enhanced, so that the effect of the oil agent is easily exhibited. Further, by adopting the configuration of the present embodiment, it is possible to give a glossy feeling to the skin when applied to the skin.

The oil-in-water emulsified composition of the present embodiment is preferably liquid at 25 ° C. The pharmaceutical stability of the liquid oil-in-water emulsified composition is generally more difficult to ensure than the viscous one. According to this embodiment, the emulsification stability and the stability over time are ensured even though the liquid is liquid at 25 ° C. Here, in the present specification, the liquid state at 25 ° C. means a state having fluidity at 25 ° C. Specifically, it means that the viscosity measured by a Brookfield type rotational viscometer at 25 ° C. is 10,000 mPa · s or less, preferably 5000 mPa · s or less, and more preferably 2000 mPa · s or less.

Further, the oil-in-water emulsified composition of the present embodiment preferably has a transparent to translucent appearance.

From the viewpoint of stability over time, the average particle size of the emulsified particles in the oil-in-water emulsified composition is 300 nm or less, preferably 200 nm or less, and more preferably 150 nm or less. The lower limit of the average particle size of the emulsified particles in the oil-in-water emulsified composition is not particularly limited because the smaller it is, the more excellent the pharmaceutical stability is, but it is usually 10 nm or more. Such fine emulsified particles can be obtained, for example, by a phase inversion temperature emulsification method, as will be described later. Therefore, a preferred embodiment of the present invention is an oil-in-water emulsified composition obtained by a phase inversion temperature emulsification method.

For the average particle size of the emulsified particles, the value measured by the example is adopted.

(Component (A): ester oil liquid at 25 ° C and / or vegetable oil liquid at 25 ° C)
The ester oil liquid at 25 ° C. and / or the vegetable oil liquid at 25 ° C. of the component (A) have a high refractive index, and when applied to the skin as a cosmetic, the skin can be given a glossy feeling. In addition, it is possible to give a moist feeling to the skin.

Examples of the ester oil include an ester composed of a linear or branched fatty acid and a linear or branched monohydric or polyhydric alcohol. The ester oil liquid at 25 ° C. preferably does not have a hydroxyl group. Ester oils that are liquid at 25 ° C. include glyceryl tri2-ethylhexanoate, glyceryl diisostearate, diglyceryl diisostearate, glyceryl triisostearate, diglyceryl triisostearate, trimethylolpropane triisostearate, and diglyceryl tetraisostearate. , Polyglyceryl decaisostearate, Isotridecyl isononanoate, Pentaerythrite tetra2-ethylhexanoate, Pentaerythrit tetraisostearate, Cetyl 2-ethylhexanate, Octyldodecyl oleate, Tri (capril / capric acid) glyceryl, Dicapric acid Examples thereof include propylene glycol, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, isosetyl stearate, neopentyl glycol dioctanoate, di2-ethylhexyl succinate, 2-ethylhexyl paramethoxysilicate, ethylhexyl salicylate and the like.

As the ester oil liquid at 25 ° C. (hereinafter, when simply referred to as an ester oil, the ester oil liquid at 25 ° C.), it is preferable that the fatty acids constituting the ester have a branched or double bond. .. Ester oil, in which the fatty acids that make up the ester have branches or double bonds, can shake the intercellular lipids in the skin, and the oil has good permeability to the skin. The effect is easy to obtain. On the other hand, these oil agents tend to destabilize the structure of the interface of the emulsified droplets of the oil agent, and the emulsification stability tends to be unstable. However, in the present embodiment, even when these oil agents are used, fine emulsified droplets are stably formed by combining the component (B) and the component (C). Examples of the ester oil liquid at 25 ° C. in which the fatty acids constituting the ester have a branch or a double bond include glyceryl tri2-ethylhexarate, glyceryl diisostearate, diglyceryl diisostearate, glyceryl triisostearate, and tri. Diglyceryl isostearate, Trimethylolpropane triisostearate, Diglyceryl tetraisostearate, Polyglyceryl decaisostearate, Isotridecyl isononanoate, Pentaerythrit tetra2-ethylhexanoate, Pentaerythrit tetraisostearate, Cetyl 2-ethylhexarate And so on.

Further, the molecular weight of the ester oil is preferably 400 or more. Ester oil having a molecular weight of 400 or more has the effect of further imparting a glossy feeling when applied to the skin as a cosmetic, but it tends to destabilize the interface structure of the emulsified droplets of the oil agent and is emulsified. Stability tends to be unstable. However, in the present embodiment, even when an oil having a relatively large molecular weight is used, fine emulsified droplets are stably formed by combining the component (B) and the component (C). The molecular weight of the ester oil is more preferably 500 or more, and even more preferably 600 or more. The upper limit of the molecular weight of the ester oil is not particularly limited, but is usually 1500 or less.

Vegetable oil may be used as the component (A). The vegetable oil is preferably composed of an ester oil. Vegetable oils have a relatively high refractive index and tend to give a glossy feeling when applied to the skin, but vegetable oils are usually a mixture of a plurality of fatty acid ester oils and have a non-uniform molecular weight distribution. Therefore, it is difficult to carry out fine emulsification, and it is also difficult to ensure stability over time. However, in the present embodiment, even when vegetable oil is used, fine emulsified droplets are stably formed by combining the component (B) and the component (C).

Examples of the vegetable oil liquid at 25 ° C. include olive oil, macadamia nut oil, meadowfoam oil, jojoba oil, avocado oil, sunflower oil, red flower oil, sunflower oil, canola oil, kyonin oil, rice germ oil, and rice bran oil.

As the vegetable oil, it is preferable that the fatty acid of the fatty acid ester constituting the vegetable oil has a double bond and contains 70 mol% or more of the unsaturated fatty acid having 12 to 22 carbon atoms in the fatty acid. It is preferable to use the vegetable oil in that the oil agent has good permeability to the skin and gives the skin a fluffy firmness. The vegetable oil is preferably olive oil, macadamia nut oil, meadowfoam oil, or jojoba oil, and more preferably olive oil or macadamia nut oil.

The component (A) preferably has a refractive index of 1.40 or more. When the refractive index of the component (A) is 1.40 or more, an appropriate glossiness can be obtained when applied to the skin.

A preferred embodiment is at least one selected from the group consisting of an ester oil having a molecular weight of 400 or more and a vegetable oil, because the glossiness of the cosmetic can be further improved.

The component (A) may be used alone or in combination. For example, the ester oil liquid at 25 ° C. may be used alone or in combination, and the vegetable oil liquid at 25 ° C. may be used alone or in combination. , Ester oil liquid at 25 ° C. and vegetable oil liquid at 25 ° C. may be used in combination.

In the oil-in-water emulsification composition of the present invention, even if the component (A) is blended in an oil agent in an amount of 60% by mass or more, an oil-in-water emulsification composition having excellent stability can be obtained. Since a high-concentration ester oil or the like can be blended in the oil agent, it can be expected to expand the functional range of imparting a glossy feeling when used in basic cosmetics such as lotion. Further, in the system of the present embodiment, it is preferable that the component (A) is 60% by mass or more in the oil agent from the viewpoint of emulsification stability. Therefore, the content of the component (A) in the oil agent is 60% by mass or more, 70% by mass or more, 80% by mass or more, 85% by mass or more, and 90% by mass or more in the preferable order. The upper limit of the content of the component (A) in the oil is 100% by mass.

Examples of the oil agent other than the component (A) include hydrocarbons such as isododecane, isohexadecane, light isoparaffin, liquid paraffin, squalane, squalane, α-olefin oligomer, polybutene, liquid isoparaffin, heavy liquid isoparaffin, polyisobutylene, and hydrogenated polyisobutene. Oils; fatty acids such as oleic acid and isostearic acid; higher alcohols such as oleyl alcohol, 2-octyldodecanol, 2-decyltetradecanol, isostearyl alcohol, 2-hexyldecanol; dimethylpolysiloxane (dimethicone), methyltri Meticone, methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, tetramethyltetrahydrogencyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetratrifluoropropylcyclotetrasiloxane , Pentamethylpentatrifluoropropylcyclopentasiloxane, polyether-modified methylpolysiloxane, oleyl-modified methylpolysiloxane, polyvinylpyrrolidone-modified methylpolysiloxane and other silicone oils; Fluorine-based oils; lanolin derivatives such as lanolin acetate, lanolin fatty acid isopropyl, and lanolin alcohol; liquid oils such as fragrances that are liquid at 25 ° C; cacao butter, shea butter, castor oil, hardened castor oil, hardened palm oil, vaseline, Monostearic acid-cured castor oil, monohydroxystearic acid-cured castor oil, cholesteryl hydroxystearyl acid, dipentaerythrit fatty acid ester, N-lauroyl-L-glutamic acid-di (octyldodecyl / cholesteryl / behenyl), N-lauroyl-L -Glutamic acid-di (octyldodecyl / phytosteryl / behenyl), macadamia nut oil fatty acid phytosteryl, dimerginolic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl) and other paste-like oils; paraffin wax, ceresin wax, microcrystalin wax , Siloxane wax, Fishertropsh wax, stearic acid, behenic acid, cetyl palmitate, polyethylene glycol distearate, glyceryl tribehenate, cholesterol, phytosterol, stearyl-modified poly Examples thereof include solid oils such as siloxane, hydrogenated oil, vaseline, and palm oil that are solid at 25 ° C.

Further, in consideration of emulsion stability, the content of the hydrocarbon oil is preferably as small as possible. For example, the content of the hydrocarbon oil is preferably 0.5% by mass or less in the oil-in-water emulsified composition. , 0.1% by mass or less, and more preferably not contained (0% by mass).

The blending amount of the component (A) in the oil-in-water emulsified composition is preferably 0.5% by mass or more, and more preferably more than 1% by mass, from the viewpoint of adjusting the feel such as imparting a glossy feeling. Further, it is desired to add as much oil as possible from the viewpoint of adjusting the feel, but it is difficult to add as much as possible from the viewpoint of emulsion stability. Therefore, according to the present embodiment, the component (A) is 3% by mass. Emulsification stability is maintained even in areas where there is a large amount of oil. From such a viewpoint, the blending amount of the component (A) in the oil-in-water emulsified composition is preferably more than 3% by mass, more preferably 4% by mass or more. Further, the blending amount of the component (A) in the oil-in-water emulsification composition is preferably less than 20% by mass, more preferably 15% by mass or less from the viewpoint of emulsion stability.

(Component (B): Polyoxyethylene hydrogenated castor oil having an average addition mole number of ethylene oxide of 20 to 30)
Polyoxyethylene hydrogenated castor oil is hydrogenated castor oil with ethylene oxide added. The average number of moles of ethylene oxide added is 20 to 30, and more preferably, the average number of moles of ethylene oxide added is 20.

The content of the component (B) is appropriately set depending on the balance of the blending amounts of the component (A) and the component (C), but is preferably 1 in the oil-in-water emulsified composition from the viewpoint of emulsion stability. It is preferably 5% by mass or more, more preferably 2% by mass or more, and even more preferably more than 2.5% by mass from the viewpoint of stability over time. Further, from the viewpoint that a large amount of the component (B) is added to affect the usability, the content is preferably 15% by mass or less, more preferably 10% by mass or less in the oil-in-water emulsified composition.

(Component (C): One or more selected from sorbitan monoisostearate and sorbitan diisostearate)
Sorbitan monoisostearate and / or sorbitan diisostearate is an ester of sorbitol and isostearic acid.

Sorbitan monoisostearate and sorbitan diisostearate may be used in combination of both. For example, the cosmetic ingredient labeling name "sorbitan sesquiisostearate" is a mixture of sorbitan monoisostearate and sorbitan diisostearate, and thus sorbitan sesquiisostearate may be used as the ingredient (C).

The content of the component (C) is not particularly limited, but is preferably 0.1% by mass or more in the oil-in-water emulsified composition, and stability over time is further ensured. , It is preferable that it exceeds 0.5% by mass. The content of the component (C) is not particularly limited, but is 3% by mass or less because it affects the emulsification stability and the time-dependent stability of the oil-in-water emulsification composition. More preferred.

The content ratio ((B) / (C)) of the component (B) to the component (C) is more than 1 and less than 20 (1 <(B) / (C) (content ratio) <20). .. When (B) / (C) is in this range, the emulsification stability of the oil-in-water emulsified composition is ensured. (B) / (C) is preferably 2 or more and 10 or less.

The oil-in-water emulsified composition of the present application may contain other surfactants as long as the effects of the present application are not suppressed, but in consideration of emulsifying property and stability over time, substantially other surfactants are used. It is preferable that no agent is contained. The inclusion of other surfactants is permissible, for example, the content of other surfactants is 0.01% by mass or less with respect to the oil-in-water emulsified composition. It is preferably 0.005% by mass or less, further preferably 0.001% by mass or less, and particularly preferably 0% by mass.

Further, the mass ratio ((B) + (C)) / (A) of the total amount of the component (B) and the component (C) to the component (A) is 0.1 or more from the viewpoint of emulsion stability. It is preferably 0.5 or more, and more preferably 0.5 or more. Further, ((B) + (C)) / (A) is preferably 20 or less, more preferably 15 or less, because the cosmetic effect of the oil agent such as glossiness is likely to be preferably exhibited.

(Component (D): water)
This embodiment is an oil-in-water emulsified composition and contains water. The water is used as a dispersion medium and is not particularly limited, and examples thereof include purified water, distilled water, ion-exchanged water, tap water, hot spring water, and deep ocean water.

The content of the component (D) is not particularly limited, but is preferably 50 to 95% by mass in the oil-in-water emulsified composition.

In addition to the above-mentioned essential components, other additives may be added to the oil-in-water emulsified composition of the present invention. As other additives, for example, a water-soluble polymer, a lower alcohol, a polyhydric alcohol, an amino acid, a preservative, a chelating agent, a beauty ingredient and the like can be appropriately contained as long as the effects of the present invention are not impaired.

The oil-in-water emulsified composition of the present embodiment is preferably an oil-in-water emulsified composition for cosmetics because it has an effect of imparting a high glossiness.

Further, the oil-in-water emulsified composition of the present embodiment may be used as it is as the final form of the cosmetic, or the oil-in-water emulsified composition may be mixed as another component to form a cosmetic. That is, the second embodiment is a cosmetic containing the oil-in-water emulsified composition of the first embodiment. The cosmetic of the second embodiment tends to exhibit the effects of the oil-in-water emulsified composition, such as imparting a high glossiness, emulsification, and improving stability over time. Further, the cosmetic is preferably an oil-in-water type. The oil-in-water emulsified cosmetic has, for example, a form in which an aqueous additive is added to the oil-in-water emulsified composition of the first embodiment to obtain an oil-in-water emulsified cosmetic (oil-in-water emulsified composition of the first embodiment). (Cosmetics containing a substance and an aqueous additive), a form in which another oil-in-water emulsified composition is added to the oil-in-water emulsified composition of the first embodiment to obtain an oil-in-water emulsified cosmetic.

Examples of cosmetics include lotion, milky lotion, cream, beauty liquid, massage cosmetics, pack cosmetics, hand cream, body lotion, body cream, make-up cosmetics, makeup base cosmetics, eye cream, and sunburn. Cosmetics such as stoppers, hair creams, and hair waxes can be exemplified. Of these, skin care cosmetics such as lotions, milky lotions, creams, beauty essences, massage cosmetics, facial masks, hand creams, body lotions, and body creams are preferable. Examples of the method of use include a method of using it with hands, fingers and cotton, a method of impregnating it with a non-woven fabric or the like, and the like. In addition, examples of the properties of the cosmetic include liquid, gel, milky, creamy, semi-solid, and solid.

The content of the oil-in-water emulsified composition in the cosmetic is, for example, 10 to 100% by mass.

Examples of other ingredients (particularly aqueous additives) added to cosmetics include water, water-soluble polymers, preservatives, antioxidants, alcohols, beauty ingredients and the like.

Examples of the water-soluble polymer include carrageenan, xanthan gum, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, polyvinyl alcohol, polyvinyl pyrrolidone, (Na acrylate / Na acryloyldimethyltaurine) copolymer, ( PEG-240 / decyltetradeceth-20 / HDI) copolymer and the like can be mentioned.

In the cosmetic, the component (A), the component (B), and the component (C) constituting the oil-in-water emulsified composition may not be contained except that they are contained in the emulsified composition. In this case, the suitable mass ratio of each component (mass ratio of component (B) to component (C) ((B) / (C)), component (A) described in the column of the oil-in-water emulsified composition. The mass ratio of the total amount of the component (B) and the component (C) to (((B) + (C)) / (A)) is the same for cosmetics.

(Production method)
The method for producing the oil-in-water emulsification composition of the present embodiment can be produced without particular limitation as long as it is a known emulsification method. Specific examples thereof include a dispersion emulsification method, a phase inversion emulsification method, and a phase inversion temperature emulsification method. Since an emulsion having small emulsion droplets can be obtained, it is preferable to produce by the phase inversion temperature emulsification method. In the phase inversion temperature emulsification method, emulsification is performed at a temperature exceeding the phase inversion temperature (PIT) (the temperature at which the hydrophilicity and lipophilicity characteristics of the emulsifier (class) reach equilibrium), so that the emulsification passes through the phase inversion temperature. At that time, the interfacial tension is lowered, and fine emulsification becomes possible without applying a strong mechanical force. When the amount of the oil agent is increased to some extent, the phase inversion temperature rises, and the particle size of the emulsified droplet tends to increase. In the present embodiment, the combination of the component (B) and the component (C) contributes to lowering the phase inversion temperature of the ester oil or the like and lowering the interfacial tension of the emulsified droplet containing the ester oil or the like as an emulsifying aid. However, it is considered that a fine and stable emulsion can be obtained. More specifically, to exemplify a preferable production method, the components (A), (B), (C), and in some cases, other oily components are heated and mixed, and then heated to the phase inversion temperature or higher. , A production method of emulsifying and cooling by adding and mixing the heated component (D) can be mentioned. Various aqueous additives may be added to and mixed with the oil-in-water emulsified composition thus obtained to obtain a cosmetic.

The effects of the present invention will be described with reference to the following examples and comparative examples. However, the technical scope of the present invention is not limited to the following examples. Unless otherwise specified, each operation is performed at room temperature (20 to 25 ° C.). In the examples, the indication of "parts" or "%" may be used, but unless otherwise specified, it indicates "parts by mass" or "% by mass".

Examples 1 to 17 and Comparative Examples 1 to 10: Oil-in-water emulsified composition (toner)
The oil-in-water emulsified compositions of the formulations shown in Table 1 below were prepared, and the average particle size, glossiness, emulsification stability, and stability over time were evaluated by the following methods. The results are also shown in Table 1.

(Manufacturing method)
Ingredients (1) to (18) were heated to about 80 ° C. and mixed uniformly.

B. The component (19) heated to about 80 ° C. was added to A, emulsified, and then cooled to obtain an oil-in-water emulsified composition (toner).

The obtained oil-in-water emulsified compositions were all liquid at 25 ° C.

(Evaluation method 1: Average particle size)
Regarding the average particle size, each sample was filled in a plastic cuvette UVette 220-1600 nm (manufactured by Eppendorf), and the average particle size was measured with a real-time nanoparticle size measuring device DelsaMax CORE (manufactured by Beckman Coulter, Inc.).

(Evaluation method 2: Glossy feeling)
For glossiness, a usage test was conducted by 20 cosmetics evaluation panel, and after 1.5 g of each sample was applied to the entire face, each panel evaluated the glossiness immediately afterwards on a 5-point scale by the following absolute evaluation. A score was given, and the average value was calculated from the total score of all the panels of each sample, and the judgment was made according to the following four-step judgment criteria. If it is 〇 or more, it is practically acceptable.

Absolute evaluation criteria (score): (evaluation)
5: Very felt 4: Slightly felt 3: Normal 2: Not very felt 1: Not felt 4-step criteria (judgment): (Average score)
◎: 4 points or more: Very good ○: 3 points or more and less than 4 points: Good △: 2 points or more and less than 3 points: Slightly defective ×: 1 point or more and less than 2 points: Defective.

(Evaluation method 3: Emulsification stability)
Regarding the initial stability, the emulsion stability immediately after preparation of each sample was evaluated according to the following three-stage evaluation criteria.

3-step judgment criteria (judgment): (judgment criteria)
⊚: No oil floating is observed and uniform. Δ: Slight oil floating is observed. ×: Oil separation is observed.

(Evaluation method 4: Stability over time)
The stability over time was stored in a constant temperature bath at 50 ° C. or 5 ° C. for 1 month, and was evaluated according to the following 4-step evaluation criteria in comparison with the sample immediately after preparation from the viewpoint of the presence or absence of drainage or gelation.

4-step judgment criteria (judgment): (judgment criteria)
◎: No change ○: Very slight change △: Slight change ×: Significant change.

As is clear from the results in Table 1, the oil-in-water emulsified compositions of Examples 1 to 17 of the present invention have a higher gloss immediately afterwards than the oil-in-water emulsified compositions of Comparative Examples 1 to 10, and are emulsified. It was also excellent in stability.

On the other hand, in Comparative Examples 1 and 2 in which (B) / (C) was 1 or less, or 20 or more, satisfactory ones were not obtained in terms of emulsification stability and temporal stability. Further, comparison is also made in Comparative Examples 3 to 6 using an activator having a different average addition molar number of ethylene oxide of the PEG-20 hydrogenated castor oil of the component (B) and another hydrophilic surfactant having a high solubilizing ability. Similar to Example 1, the particle size was large, and no satisfactory one was obtained in terms of emulsion stability and stability over time. Further, also in Comparative Example 7 in which a lipophilic surfactant having a high solubilizing ability different from that of the component (C) sorbitan monoisostearate and sorbitan diisostearate was used, the particle size was large, and the emulsion stability and the stability over time were obtained. I was not satisfied with this point. Further, in Comparative Examples 8 to 10 using a hydrocarbon oil or silicone oil different from the ester oil of the component (A), in addition to the particle size, emulsification stability and aging stability, the glossiness is also satisfactory. Was not obtained.

Example 18: Toner (ingredient) (%)
(1) Macademia nut oil (ingredient (A)) 2
(2) PEG-20 hydrogenated castor oil (ingredient (B)) * 4 5
(3) Sorbitan isostearate (component (C)) * 5 0.5
(4) Astaxanthin 0.002
(5) Isopropylmethylphenol 0.01
(6) Vitamin E 0.03
(7) Purified water (component (D)) 58.238
(8) Glycerin 5
(9) Dipropylene glycol 5
(10) 1,3-butylene glycol 5
(11) Purified water 5
(12) Ethanol 8
(13) Phenoxyethanol 0.2
(14) Niacinamide 3
(15) Betaine 1
(16) Sodium lactate 1
(17) Polyquaternium-51 * 6 0.01
(18) Cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol * 7
1
(19) Alcaligenes-producing polysaccharide * 8 0.01
* 6 LIPIDURE PMB (BG) (manufactured by NOF CORPORATION)
* 7 NEOSOLUE-AQULIO (manufactured by Nippon Fine Chemical Co., Ltd.)
* 8 Alcasea Run (manufactured by Hakuto Co., Ltd.).

(Manufacturing method)
A. Ingredients (1) to (6) were heated to about 80 ° C. and mixed uniformly.
B. (7) heated to about 80 ° C. was added to A, and the mixture was emulsified and then cooled to obtain an oil-in-water emulsified composition. The oil-in-water emulsified composition was liquid at 25 ° C., had a particle size of 300 nm or less, and was excellent in emulsification stability and stability over time.
C. Ingredients (8) to (19) are mixed with B.
D. C was filled in a container to obtain a lotion.

The lotion obtained as described above exhibited a high glossiness immediately after being applied to the skin, and was also excellent in emulsification stability and stability over time.

The (B) / (C) (content mass ratio) was 10, and the ((B) + (C)) / (A) (content mass ratio) was 2.75.

Example 19: Sheet-shaped cosmetic (ingredient) (%)
(1) Olive oil (ingredient (A)) 1
(2) PEG-20 hydrogenated castor oil (ingredient (B)) * 4 2
(3) Sorbitan isostearate (component (C)) 0.4
(4) Cholesterol 0.01
(5) Ceramide 3 0.01
(6) Vitamin E 0.01
(7) Purified water (component (D)) 67.08
(8) Glycerin 5
(9) 1,3-butylene glycol 10
(10) Methyl paraoxybenzoate 0.1
(11) Purified water 3
(12) Ethanol 5
(13) Ascorbic acid glucoside 3
(14) Arbutin 1
(15) Sodium lactate 2
(16) Phosphoryl choline glycol polyacrylate * 9 0.01
(17) Sodium hydroxide 0.13
(18) Sodium monohydrogen phosphate 0.1
(19) Sodium dihydrogen phosphate 0.1
(20) Xanthan gum 0.05
* 9 LIPIDURE HM-600 (manufactured by NOF CORPORATION).

(Manufacturing method)
A. Ingredients (1) to (6) were heated to about 80 ° C. and mixed uniformly.
B. (7) heated to about 80 ° C. was added to A, and the mixture was emulsified and then cooled to obtain an oil-in-water emulsified composition. The oil-in-water emulsified composition was liquid at 25 ° C., had a particle size of 300 nm or less, and was excellent in emulsification stability and stability over time.
C. (8) to (20) are mixed with B, and the non-woven fabric is impregnated with this.
D. C was hermetically filled in an aluminum-laminated bag-shaped container to obtain a sheet-shaped cosmetic.

The sheet-shaped cosmetic obtained as described above was applied to the face, peeled off after 10 minutes, and evaluated. Immediately after that, a high glossiness was observed.

The (B) / (C) (content mass ratio) was 5, and the ((B) + (C)) / (A) (content mass ratio) was 2.4.

Example 20: Essence (ingredient) (%)
(1) Meadowfoam oil (ingredient (A)) 3
(2) PEG-50 hydrogenated castor oil isostearate (component (B)) 8
(3) Sorbitan monoisostearate (component (C)) 1
(4) Hydrogenated polyisobutene * 10 1
(5) Fragrance 0.05
(6) Purified water (component (D)) 68.04
(7) Glycerin 6
(8) Diglycerin 1
(9) 1,3-butylene glycol 5
(10) Ethanol 6
(11) Phenoxyethanol 0.3
(12) Sodium hydroxide 0.15
(13) Hyaluronic acid 0.01
(14) Hydrolyzed collagen 0.01
(15) Sodium edetodiate 0.02
(16) Sodium Carboxymethyl Cellulose 0.1
(17) Acrylic acid / alkyl methacrylate copolymer 0.2
(18) Carboxyvinyl polymer 0.12
* 10 Pearl Dream 46 (manufactured by NOF CORPORATION).

(Manufacturing method)
A. Ingredients (1) to (5) were heated to about 80 ° C. and mixed uniformly.
B. The component (6) heated to about 80 ° C. was added to A, emulsified and then cooled to obtain an oil-in-water emulsified composition. The oil-in-water emulsified composition was liquid at 25 ° C., had a particle size of 300 nm or less, and was excellent in emulsification stability and stability over time.
C. Ingredients (7) to (18) were mixed with the oil-in-water emulsified composition obtained in B.
D. C was filled in a container to obtain a cosmetic (beauty essence).

The beauty essence obtained as described above had a high glossiness immediately after being applied to the skin, and was also excellent in emulsification stability and aging stability.

The (B) / (C) (content mass ratio) was 8, and the ((B) + (C)) / (A) (content mass ratio) was 3.

Claims (7)

The following components (A) to (D):
(A) At least one selected from the group consisting of ester oils liquid at 25 ° C and vegetable oils liquid at 25 ° C.
(B) Polyoxyethylene hydrogenated castor oil, which has an average number of moles of ethylene oxide added of 20 to 30.
(C) One or more selected from sorbitan monoisostearate and sorbitan diisostearate,
(D) Contains water
The content mass ratio (B) / (C) of the component (B) to the component (C) is more than 1 and less than 20.
An oil-in-water emulsified composition having an average particle size of emulsified particles of 300 nm or less. The oil-in-water emulsified composition according to claim 1, wherein the content of the component (A) is 60% by mass or more with respect to the oil agent. The oil-in-water emulsified composition according to claim 1 or 2, which is liquid at 25 ° C. The oil-in-water emulsified composition according to any one of claims 1 to 3, wherein the component (A) is at least one selected from the group consisting of ester oils having a molecular weight of 400 or more and vegetable oils. The oil-in-water emulsified composition according to any one of claims 1 to 4, wherein the content of the component (B) exceeds 2.5% by mass with respect to the oil-in-water emulsified composition. The oil-in-water emulsified composition according to any one of claims 1 to 5, wherein the content of the component (C) exceeds 0.5% by mass with respect to the oil-in-water emulsified composition. A cosmetic comprising the oil-in-water emulsified composition according to any one of claims 1 to 6.