JP7612387B2 - Oil-in-water emulsion composition containing behendimonium ethyl stearyl phosphate - Google Patents

Description

The present invention relates to an oil-in-water emulsion composition containing behendimonium ethyl stearyl phosphate. The present invention also relates to a method for stabilizing an emulsion in the production of an oil-in-water emulsion composition using behendimonium ethyl stearyl phosphate.

In emulsion compositions (especially emulsion cosmetics), emulsion stability against changes over time is important, but if a surfactant with weak emulsifying power is used, there is a risk of the emulsion becoming unstable. For this reason, many studies have been conducted to stabilize the emulsion. For example, phospholipids are natural surfactants with good affinity for the skin and high moisturizing effects, and are used as emulsifiers, but phospholipids generally have weak emulsifying power. For this reason, it is necessary to improve the emulsion stability of emulsion compositions containing phospholipids. For example, Patent Document 1 discloses a technology that improves the emulsion stability of emulsion compositions containing phospholipids by supplementing emulsification by using liquid higher alcohol and glycerin in combination.

In addition, emulsion compositions (especially emulsion cosmetics) may contain liquid polar oils to ensure adequate adhesion and good spread on the skin, but polar oils can affect the stability of emulsions. For this reason, many studies have been conducted on the stable blending of polar oils. For example, Patent Document 2 discloses a technology for improving emulsion stability by combining higher alcohols, polar oils, and long-chain acylsulfonate-type anionic surfactants.

However, as in the technology of Patent Document 1, cosmetics emulsified with liquid polar oil using phospholipids as an emulsifier and liquid higher alcohol and glycerin as emulsifying aids may have a significantly worsened usability due to stickiness caused by the incorporation of liquid higher alcohol and glycerin. In addition, the technology of Patent Document 2 can improve emulsion stability, but the amount of higher alcohol incorporated may be large, resulting in a decrease in skin compatibility and smooth feel when used. Furthermore, as in these documents, when higher alcohol is combined as an emulsifying aid, the higher alcohol may precipitate from the emulsion interface into the aqueous phase, increasing the viscosity, or conversely, the higher alcohol may dissolve from the emulsion interface into the oil phase, decreasing the viscosity. Furthermore, some of the higher alcohol may form a gel with the emulsifier (e.g., phospholipid), causing thickening, which may cause problems with usability such as a smooth feel when applying the cosmetic.

Japanese Patent Application Publication No. 5-4912 JP 2008-44866 A

The present invention aims to provide an oil-in-water emulsion composition (particularly a cosmetic product) containing a liquid polar oil, which has excellent emulsion stability and a good feel when used, even when a specific surfactant (particularly a surfactant with a relatively weak emulsifying power, particularly a phospholipid) is used as an emulsifier.

The present invention includes, but is not limited to, the embodiments listed below.
[Item 1] The following components (A) to (F):
(A) one or more surfactants selected from the group consisting of nonionic surfactants having an HLB of 12.0 or more and ionic surfactants;
(B) behendimonium ethyl phosphate stearyl,
(C) a liquid polar oil;
(D) fatty acid glyceryl,
(E) a water-soluble polymer, and
(F) water,
An oil-in-water emulsion composition comprising the above (hereinafter referred to as "the emulsion composition").
[Item 2] The oil-in-water emulsion composition according to Item 1, wherein the ratio of the content of component (D) to the content of component (B) ((D)/(B)) is 0.4 or more in weight ratio.
[Item 3] The oil-in-water emulsion composition according to Item 1 or 2, wherein at least one of the components (A) is a phospholipid.
[Item 4] The oil-in-water emulsion composition according to any one of Items 1 to 3, wherein the ratio of the content of component (B) to the content of component (A) ((B)/(A)) is 0.2 or more in weight ratio.
[Item 5] The oil-in-water emulsion composition according to any one of Items 1 to 4, wherein the ratio of the total content of polar oils including component (C) to the total amount of oily components (polar oil/total amount of oily components) is 0.2 or more by weight.
[Item 6] The oil-in-water emulsion composition according to any one of Items 1 to 5, wherein the ratio of the total content of component (A) and component (B) to the total amount of oily components (((A)+(B))/total amount of oily components) is 0.05 or more in weight ratio.
[Item 7] The oil-in-water emulsion composition according to any one of Items 1 to 6, wherein component (C) is a liquid polar oil that is in a liquid form at room temperature and is selected from synthetic or natural fatty acids, fatty acid esters thereof, or higher alcohols.
[Item 8] The oil-in-water emulsion composition according to any one of Items 1 to 7, wherein component (D) is glyceryl stearate.
[Item 9] The oil-in-water emulsion composition according to any one of Items 1 to 8, wherein component (E) comprises one or more selected from the group consisting of (acrylates/C10-30 alkyl acrylate) crosspolymers and carbomers.
[Item 10] The oil-in-water emulsion composition according to any one of Items 1 to 9, further comprising a higher alcohol as component (G).
[Item 11] The oil-in-water emulsion composition according to any one of Items 1 to 10, further comprising a fatty acid as component (H).
[Item 12] The oil-in-water emulsion composition according to any one of Items 1 to 11, which is an emulsion cosmetic.
[Item 13] The oil-in-water emulsion composition according to any one of Items 1 to 12, which is for use on the skin.
[Item 14] The following components (A) to (F):
(A) one or more surfactants selected from the group consisting of nonionic surfactants having an HLB of 12.0 or more and ionic surfactants;
(B) behendimonium ethyl phosphate stearyl,
(C) a liquid polar oil;
(D) fatty acid glyceryl,
(E) a water-soluble polymer, and
(F) water,
The present invention relates to a method for emulsion stabilization in the production of an oil-in-water emulsion composition, the method comprising the steps of:

According to the present invention, by using behendimonium ethyl stearyl phosphate, it is possible to provide an oil-in-water emulsion composition (particularly a cosmetic product) that has good emulsion stability and is excellent in usability, even when a liquid polar oil is blended.

The oil-in-water emulsion composition of the present invention comprises the following components (A) to (F):
(A) one or more surfactants selected from the group consisting of nonionic surfactants having an HLB of 12.0 or more and ionic surfactants;
(B) behendimonium ethyl phosphate stearyl,
(C) a liquid polar oil;
(D) fatty acid glyceryl,
(E) a water-soluble polymer, and
(F) water,
Contains:
In this specification, (A) to (F) are label symbols of components, and hereinafter may be referred to as component (A), etc.

Component (A)
Component (A) is one or more surfactants selected from the group consisting of nonionic surfactants with an HLB value of 12.0 or more and ionic surfactants. The nonionic surfactant contained in component (A) is a surfactant with a relatively high hydrophilicity, having an HLB value of 12.0 or more. Of course, if component (A) is contained in the present emulsion composition, the present emulsion composition may or may not further contain a nonionic surfactant with an HLB value of less than 12.0. The HLB value is typically an index indicating the degree of affinity between water and oil (hydrophobic oil) of a nonionic surfactant, and the higher the value, the higher the hydrophilicity. The HLB value can be determined as a value specific to each substance, or is publicly known. The HLB value (hydrophilic-lipophilic balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant, and is determined by the Griffin formula.

Nonionic surfactants with an HLB value of 12.0 or higher include, but are not limited to, fatty acid polyoxyethylene surfactants, polyoxyethylene hydrogenated castor oil, fatty acid polyglyceryl surfactants, and sucrose fatty acid esters, all of which have an HLB value of 12.0 or higher. Specific examples include polyoxyethylene sorbitan monostearate (HLB 14.9), polyoxyethylene sorbitan monooleate (HLB 15.0), polyoxyethylene sorbitan monolaurate (HLB 16.7), and sesquistearate. These include PEG-20 methyl glucose stearate (HLB 15.0), polyoxyethylene sorbitol tetraoleate (HLB 13.8), PEG-40 monostearate (HLB 17.5), PEG-30 phytosterol (HLB 18.0), polyoxyethylene hydrogenated castor oil (HLB 14.0), decaglyceryl monostearate (HLB 12.0), polyoxyethylene alkyl (12-15) ether phosphate (10 E.O.) (HLB 13.5), and sucrose stearate (HLB 15.0).

The ionic surfactant may be any of an anionic surfactant, a cationic surfactant, and an amphoteric surfactant (zwitterionic surfactant). Of these, it is preferable to include at least one selected from an anionic surfactant and an amphoteric surfactant.

Anionic surfactants include, but are not limited to, sodium N-stearoyl-N-methyl taurate, sodium stearoyl lactate, sodium N-stearoyl-L-glutamate, etc.

Examples of amphoteric surfactants include, but are not limited to, phospholipids, alkyl betaine type amphoteric surfactants such as lauryl dimethyl betaine, amidopropyl betaine type amphoteric surfactants such as oleic acid amidopropyl betaine, and amino acid type amphoteric surfactants such as sodium lauryl aminopropionate. Phospholipids are amphiphilic substances and are classified as amphoteric surfactants in this specification.

It is particularly preferable to include phospholipids as component (A). Phospholipids are also called lecithin. Phospholipids are surface active substances with good affinity to the skin and a high moisturizing effect, and by using phospholipids, an emulsion composition with excellent usability and moisturizing properties can be obtained in addition to the surface active effect. Here, although phospholipids are highly compatible with the skin, they tend to have a weak emulsifying power. However, in this emulsion composition, by including component (B) in particular, an emulsion composition with excellent emulsion stability can be obtained even when phospholipids are used as an emulsifier. In this specification, phospholipids refer to compounds having a structure in which fatty acids and phosphoric acid are bonded to glycerin or sphingosine as a central skeleton, and further, alcohol is ether-bonded to the phosphoric acid. The phospholipid may be either a natural phospholipid or a synthetic phospholipid, or may be a hydrogenated phospholipid obtained by hydrogenating these phospholipids. Examples of natural phospholipids include phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, lysophosphatidylcholine, sphingomyelin, egg yolk phospholipids, soybean phospholipids, etc. Examples of synthetic phospholipids include dilauroylphosphatidylcholine, dimyristoylphosphatidylcholine, dipalmitoylphosphatidylcholine, distearoylphosphatidylcholine, dioleoylphosphatidylcholine, palmitoyloleoylphosphatidylcholine, etc. Examples of hydrogenated phospholipids include hydrogenated soybean phospholipids, hydrogenated soybean lysophospholipids, hydrogenated egg yolk phospholipids, hydrogenated phosphatidylcholine, hydrogenated phosphatidylserine, etc., with hydrogenated soybean phospholipids being particularly preferred.

The content of component (A) in the present emulsion composition (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of obtaining sufficient surfactant ability, it can be 0.001 to 10% by weight, preferably 0.01 to 5% by weight, and more preferably 0.1 to 1% by weight, relative to the total amount (100% by weight) of the present emulsion composition. In particular, when a phospholipid is included as component (A), the content of the phospholipid is preferably in the above range in order to obtain sufficient surfactant ability as well as improve usability such as smoothness.

ホスホコリンの部分（ホスホコリン基ともいう）は、リン脂質の極性基であり、親水基として機能する。また、ホスホコリン基の両側にはそれぞれ、アルキル基（Ｃ_２２とＣ_１８の飽和アルキル）が結合しており、このアルキル基が疎水基として機能する。そのため、ベヘンジモニウムエチルリン酸ステアリルは、界面活性剤として機能し得る。より詳しくは、ベヘンジモニウムエチルリン酸ステアリルは、カチオン性部分とアニオン性部分との両方を含むため、両性界面活性剤（両イオン性界面活性剤）として分類される。また、ベヘンジモニウムエチルリン酸ステアリルは、リン脂質と類似の化学構造を有しているため、界面活性剤として使用され得るリン脂質との親和性が高い。したがって、本乳化組成物は、ベヘンジモニウムエチルリン酸ステアリルを含むことで、界面活性剤（特にリン脂質）の乳化を補い、乳化安定性を向上させることができる。また、ベヘンジモニウムエチルリン酸ステアリルはリン脂質と類似の構造を有することから、皮膚への親和性が高いと考えられ、本乳化組成物（特に化粧料）を皮膚に適用したときに、なめらかさなどの良好な使用感や保湿性などを得ることができる。ベヘンジモニウムエチルリン酸ステアリルは、市販のもの（例えば、日油株式会社製「Ｖｉｎｏｖｅｉｌ－ＢＳ－１００Ｐ」）を用いることができる。 Component (B)
Component (B), behendimonium ethyl stearyl phosphate, is a substance represented by the following structural formula, and is a compound having a phosphocholine structure (-N ⁺ (CH ₃ ) ₂ (CH ₂ ) ₂ -O-PO ₃ ^- -) in the molecule.

The phosphocholine portion (also called the phosphocholine group) is a polar group of phospholipids and functions as a hydrophilic group. In addition, an alkyl group ( _C22 and _C18 saturated alkyl) is bonded to each side of the phosphocholine group, and the alkyl group functions as a hydrophobic group. Therefore, behendimonium ethyl stearyl phosphate can function as a surfactant. More specifically, behendimonium ethyl stearyl phosphate contains both a cationic portion and an anionic portion, and is therefore classified as an amphoteric surfactant (amphoteric surfactant). In addition, behendimonium ethyl stearyl phosphate has a chemical structure similar to that of phospholipids, and therefore has a high affinity with phospholipids that can be used as surfactants. Therefore, by containing behendimonium ethyl stearyl phosphate, the present emulsion composition can supplement the emulsification of surfactants (especially phospholipids) and improve emulsion stability. In addition, since behendimonium ethyl stearyl phosphate has a structure similar to that of phospholipids, it is considered to have high affinity for the skin, and when the present emulsion composition (particularly a cosmetic preparation) is applied to the skin, it is possible to obtain a good feeling of use such as smoothness, moisturizing properties, etc. As the behendimonium ethyl stearyl phosphate, commercially available products (for example, "Vinoveil-BS-100P" manufactured by NOF Corporation) can be used.

The content of component (B) (behendimonium ethyl stearyl phosphate) in the present emulsion composition is not limited thereto, but from the viewpoint of improving emulsion stability, it can be 0.001 to 20% by weight, preferably 0.01 to 15% by weight, more preferably 0.1 to 10% by weight, even more preferably 0.2 to 10% by weight, even more preferably 0.3 to 9% by weight, and even more preferably 0.4 to 8% by weight, based on the total amount of the present emulsion composition (100% by weight). The greater the amount of component (B), the greater the ability of component (A) to assist the surfactant, and the greater the emulsion stability of the composition. In particular, when component (B) exceeds 0.1% by weight (particularly 0.2% by weight or more, even 0.3% by weight or more, or 0.4% by weight or more), the emulsion stability is significantly improved. However, if the amount of component (B) is too large, the feeling of use may be impaired, so it is preferable to mix it at the upper limit as described above (preferably 20% by weight or less).

Component (C)
The liquid polar oil of component (C) can constitute the main oil in the oil-in-water emulsion composition (i.e., emulsion) of the present invention. The inclusion of the liquid polar oil makes it possible to impart an excellent feeling of use to cosmetics and the like. Specifically, the polar oil can provide a moderate sense of adhesion and good spread on the skin, and can provide a smooth feeling of use during use (during application), and can provide a moderate film feeling after use while suppressing a sticky feeling and a tight feeling. In this specification, polar oil means an oil having polarity in the molecule. In addition, in this specification, the liquid in polar oil means that it is preferably liquid at a normal temperature (e.g., 10 to 30°C) when using the cosmetic, and is liquid under conditions of, for example, room temperature (specifically, 25°C).

Liquid polar oils include, but are not limited to, synthetic ester oils, natural ester oils, higher alcohols, and fatty acids. Among these, it is preferable that component (C) is a liquid polar oil selected from synthetic or natural fatty acids, their fatty acid esters, or higher alcohols that are in a liquid form at room temperature (specifically, 25°C).

Synthetic ester oils are not particularly limited, but examples of synthetic fatty acid esters include esters of fatty acids and lower or higher alcohols, and monoesters, diesters, or triesters of fatty acids and polyhydric alcohols (e.g., dihydric or trihydric alcohols).

Synthetic ester oils are particularly esters of synthetic fatty acids, specifically, cetyl 2-ethylhexanoate, isopropyl myristate, isododecyl myristate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, ethyl oleate, oleyl oleate, propylene glycol dicaprate, neopentyl glycol dicaprate, diisostearyl malate, diisobutyl adipate, glyceryl monoisostearate, glyceryl diisostearate, glyceryl triisostearate, polyglyceryl-2 monoisostearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 tetraisostearate, glyceryl tri-2-ethylhexanoate, Examples of the isoctanoic acid esters include, but are not limited to, glyceryl trioctanoate, glyceryl tri(capryl/capric acid), neopentyl glycol di-2-ethylhexanoate, octyldodecyl lactate, pentaerythritol tetraisostearate, pentaerythritol tetra-2-ethylhexanoate (pentaerythrityl tetraethylhexanoate), tritridecyl trimellitate, bisethoxydiglycol cyclohexane-1,4-dicarboxylate, isotridecyl isononanoate, isononyl isononanoate, alkyl benzoate (C12-15), ethylhexyl methoxycinnamate, ethylhexyl salicylate, ascorbyl tetrahexyldecanoate, polyhydroxystearic acid, di(isostearyl/phytosteryl) dimer dilinoleate, and the like. In addition to the above synthetic fatty acid esters, examples include di(phytosteryl 2-octyldodecyl) N-lauroyl-L-glutamate, tocopherol acetate, dialkyl carbonate, dimer dilinoleyl hydrogenated rosin condensate, polysilicone-15, etc., but are not limited to these. Of these, diesters or triesters of fatty acids and polyhydric alcohols, such as glyceryl tri-2-ethylhexanoate (also known as triethylhexanoin), are more preferred.

Natural ester oils are esters of natural fatty acids, specifically, avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese ginger oil, jojoba oil, and germ oil, rapeseed oil, almond oil, apricot kernel oil, perilla oil, orange oil, kiwi seed oil, grape seed oil, rice germ oil, sage oil, tea seed oil, evening primrose oil, pearl barley oil, peanut oil, sunflower oil, sunflower seed oil, meadowfoam oil, rosemary oil, jojoba seed oil, lavender oil, rosehip oil, mink oil, etc. are exemplified, but are not limited to these.

Specific examples of higher alcohols include, but are not limited to, isostearyl alcohol, 2-hexyldecanol, and oleyl alcohol.

Specific examples of fatty acids include, but are not limited to, isostearic acid, isopalmitic acid, and oleic acid. Of these, isostearic acid is more preferred.

The content of component (C) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of obtaining an emulsion composition (particularly a cosmetic product) that has a good feel when used (smoothness, pleasant after-skin feeling, etc.), it can be 0.001 to 50% by weight, preferably 0.01 to 40% by weight, more preferably 0.1 to 30% by weight, and even more preferably 1 to 20% by weight, relative to the total amount (100% by weight) of the emulsion composition.

Component (D)
The fatty acid glyceryl is an ester of a fatty acid and glycerin. It is also called a glycerin fatty acid ester. The inclusion of the fatty acid glyceryl can further improve emulsion stability. Examples of the fatty acid glyceryl include, but are not limited to, glyceryl stearate, hydrogenated rapeseed oil fatty acid glycerides, and glyceryl isostearate. As the fatty acid glyceryl, in particular, one or more selected from glyceryl stearate and hydrogenated rapeseed oil fatty acid glycerides are preferred, and glyceryl stearate is more preferred. The fatty acid glyceryl of component (D) may be a polar oil, and in this case, it may be a solid polar oil or a liquid polar oil. In the case of a liquid polar oil, it also serves as component (C). In one embodiment, component (D) may be a solid.

The content of component (D) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of improving emulsion stability, it can be 0.001 to 20% by weight, preferably 0.01 to 15% by weight, and more preferably 0.1 to 10% by weight, based on the total amount of the emulsion composition (100% by weight).

Component (E)
It is believed that the water-soluble polymer dissolves in the aqueous phase, which is the external phase, in the present emulsion composition to form a polymer network, and further increases the viscosity, making phase separation difficult, thereby improving the stability of the emulsion state of the composition. Examples of water-soluble polymers include copolymers of polyacrylic acid and alkyl methacrylate, acrylic acid-based polymers such as crosslinked polyacrylic acid, and polysaccharides, and specific examples thereof include, but are not limited to, (acrylates/alkyl acrylate (C10-30)) crosspolymers, carbomers, xanthan gum, cellulose gum, agar, gellan gum, methylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, sodium acrylate-sodium acryloyldimethyltaurate copolymers, polyvinyl alcohol, collagen, hyaluronic acid, acrylates copolymers, and carrageenans. As the water-soluble polymer, in particular, one or more selected from (acrylates/alkyl acrylate (C10-30)) crosspolymer, carbomer, and xanthan gum are preferred, and one or more selected from (acrylates/alkyl acrylate (C10-30)) crosspolymer and carbomer are more preferred. Incidentally, (acrylates/alkyl acrylate (C10-30)) crosspolymer includes what is called acrylic acid/alkyl methacrylate copolymer. As the (acrylates/alkyl acrylate (C10-30)) crosspolymer, commercially available products (for example, manufactured by LUBRIZOL) can be used.

The content of component (E) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of improving emulsion stability, it can be 0.0001 to 10% by weight, preferably 0.001 to 5% by weight, and more preferably 0.01 to 1% by weight, relative to the total amount of the emulsion composition (100% by weight).

Component (F)
Component (F), water, is an essential component in the oil-in-water emulsion composition. The water is not limited to this, but purified water is preferably used. In this emulsion composition, the emulsion form is oil-in-water (O/W), with the water phase being the outer phase and the oil phase being the inner phase.

Component (F) can be the component with the highest content in the present emulsion composition. The water content of component (F) in the present emulsion composition, which is an oil-in-water type, is preferably greater than the total amount of oily components, and may be at least two or three times the total amount of oily components. In addition, the content of component (F) relative to the total amount of the present emulsion composition (100% by weight) is not limited to this, but may be 1 to 99% by weight, preferably 10 to 98% by weight, more preferably 20 to 95% by weight, and even more preferably 30 to 90% by weight. In addition, depending on the form of the formulation, the content of component (F) may be 40% by weight or more, 50% by weight or more, 60% by weight or more, or 70% by weight or more.

The emulsion composition preferably further contains a higher alcohol as component (G). The higher alcohol further stabilizes the emulsion and improves the feel of use, such as smoothness on the skin. In the present invention, it is speculated that the behendimonium ethyl stearyl phosphate of component (B) can particularly suppress the instability of the composition (such as an increase or decrease in viscosity, or gelation) caused by the movement of the emulsion interface of the higher alcohol (from the oil phase to the water phase, or from the water phase to the oil phase), but the present invention is not limited to this speculation. In this specification, a higher alcohol means a monohydric alcohol having a chain-like hydrocarbon group with 6 or more carbon atoms (specifically, 6 to 24 carbon atoms, preferably 8 to 22 carbon atoms, more preferably 10 to 20 carbon atoms). Examples of higher alcohols include, but are not limited to, lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), isostearyl alcohol, stearyl alcohol, behenyl alcohol, and cetostearyl alcohol. As the higher alcohol, cetostearyl alcohol is particularly preferable. The higher alcohol of component (G) may be classified as a polar oil, and in this case, it may be a solid polar oil or a liquid polar oil. When component (G) is a liquid polar oil, it also serves as component (C). In one embodiment, component (G) may be a solid.

When component (G) is included in the present emulsion composition, the content of component (G) (the total amount when there are multiple components) is not limited to this, but from the viewpoint of improving emulsion stability, it can be 0.0001 to 20% by weight, preferably 0.001 to 10% by weight, and more preferably 0.01 to 5% by weight, relative to the total amount (100% by weight) of the present emulsion composition. In some embodiments, the present emulsion composition does not need to contain component (G), in which case the content is 0% by weight.

The present emulsion composition preferably further contains a fatty acid as component (H). The fatty acid further stabilizes the emulsion and improves the feeling of use, such as smoothness on the skin. The fatty acid is preferably a higher fatty acid. In this specification, higher fatty acid means a fatty acid having 12 or more carbon atoms. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid, but from the viewpoint of stability, a saturated fatty acid is preferable. Examples of fatty acids (higher fatty acids) include, but are not limited to, lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid. As the higher fatty acid, in particular, one or more selected from stearic acid and isostearic acid are preferable. The higher fatty acid of component (H) may be classified as a polar oil, and in this case, it may be a solid polar oil or a liquid polar oil. When component (H) is a liquid polar oil, it also serves as component (C). Isostearic acid corresponds to a liquid polar oil. In one embodiment, component (H) may be solid.

When component (H) is included in the present emulsion composition, the content of component (H) (the total amount when there are multiple components) is not limited to this, but from the viewpoint of improving emulsion stability, it can be 0.0001 to 20% by weight, preferably 0.001 to 10% by weight, and more preferably 0.01 to 5% by weight, relative to the total amount (100% by weight) of the present emulsion composition. In some embodiments, the present emulsion composition does not need to contain component (H), in which case the content is 0% by weight.

Other Components The present emulsion composition may contain various components that can be formulated as an oil-in-water emulsion composition (particularly a cosmetic). Examples of such components include moisturizers, thickeners, powders, pigments, UV absorbers, film-forming agents, pH adjusters, anti-fading agents, antioxidants, defoamers, cosmetic ingredients, plant extracts, preservatives, and fragrances. For example, pH adjusters are preferably used because they can adjust the viscosity of certain water-soluble polymers (e.g., acrylic acid-based polymers such as (acrylates/alkyl acrylate (C10-30)) crosspolymers and carbomers). Examples of pH adjusters include, but are not limited to, sodium hydroxide, potassium hydroxide, and triethanolamine.

In addition, the present emulsion composition may further contain a nonionic surfactant with an HLB of less than 12.0, so long as it contains components (A) to (F). Examples of nonionic surfactants with an HLB of less than 12.0 include, but are not limited to, sorbitan sesquioleate, PEG-5 phytosterol, and polyoxyethylene alkyl (12-15) ether phosphate (8 E.O.), etc.

The emulsion composition may also contain a solid polar oil. As described above, the solid polar oil may be contained as component (D), component (G) and component (H), or may be contained as another component. Examples of solid polar oils include, but are not limited to, ester oils such as synthetic ester oils and natural ester oils, higher alcohols and fatty acids. Specific examples include, but are not limited to, di(octyldodecyl/phytosteryl/behenyl) lauroyl glutamate, stearyl alcohol, lauric acid and diethylaminohydroxybenzoylhexyl benzoate. In this specification, the term "solid" in polar oil means that the polar oil is solid under conditions of 25°C.

The emulsion composition may contain a non-polar oil. In this specification, non-polar oil means an oil composed of molecules that have no polarity. Examples of non-polar oils include hydrocarbon compounds and silicon-based compounds, and specific examples include light isoparaffin, light liquid isoparaffin, liquid isoparaffin, liquid paraffin, synthetic squalane, vegetable squalane, squalane, α-olefin oligomer, petrolatum, isododecane, hydrogenated polyisobutene, dimethicone, diphenylsiloxyphenyl trimethicone, cyclopentasiloxane, etc., but are not limited to these.

The emulsion composition may also contain oily components other than those exemplified above. Examples of such oily components include paste oils such as phytosteryl/isostearyl/cetyl/stearyl/behenyl dimer dilinoleate, hydrogenated castor oil stearate, dipentaerythrityl hexa(hydroxystearic acid/stearic acid/rosin acid), and dextrin isostearate; solid oils such as bisethylhexyloxyphenol methoxyphenyl triazine; and solid water-dispersible components such as methylene bisbenzotriazolyl tetramethylbutylphenol, but are not limited thereto.

The emulsion composition may contain water-soluble liquid components as appropriate. Examples of water-soluble liquid components include water-soluble alcohols and polyhydric alcohols. Examples of water-soluble alcohols include, but are not limited to, ethanol, methanol, propanol, and isopropanol. Examples of polyhydric alcohols include, but are not limited to, glycerin, diglycerin, 1,3-butylene glycol, and dipropylene glycol.

Preferred component ratios In the present emulsion composition, the ratio of the content of component (D) to component (B) ((D)/(B)) is preferably 0.2 or more, more preferably 0.3 or more, and even more preferably 0.4 or more, in terms of weight ratio. By increasing this ratio ((D)/(B)) as described above, the emulsion stability is further improved, and an emulsion composition with good usability is obtained. This ratio ((D)/(B)) may be 0.5 or more, or 0.8 or more. However, if this ratio ((D)/(B)) is too high, the content of component (B) in the present emulsion composition may be relatively too low. For example, this ratio ((D)/(B)) may be preferably 20 or less, more preferably 10 or less, and even more preferably 5 or less, but is not limited thereto.

In the present emulsion composition, the ratio of the content of component (B) to component (A) ((B)/(A)) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, by weight. By increasing this ratio ((B)/(A)) as described above, the emulsification-assisting effect of component (B) on component (A) can be effectively obtained, so that the emulsion stability is further improved, and by increasing the proportion of component (B) among the components that may have surface activity, it becomes easier to obtain an emulsion composition with good after-skin feel (moderate film feeling). This ratio ((B)/(A)) may be 0.3 or more, or 0.5 or more, or 0.8 or more. However, if this ratio ((B)/(A)) is too high, the content of component (A) in the present emulsion composition may become relatively too low, which may reduce the surfactant properties and may also reduce the pleasant after-skin feeling (adequate film-like feel). For example, this ratio ((B)/(A)) may be, but is not limited to, preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less.

In this emulsion composition, the ratio of the total content of polar oils including component (C) to the total amount of oily components (polar oil/total amount of oily components) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, in weight ratio. By increasing this ratio (polar oil/total amount of oily components), the proportion of polar oil contained in the oily components increases, making it easier to obtain an emulsion composition (particularly a cosmetic) that has good after-skin (moderate adhesion and film feeling) and spreads during use and gives a smooth feeling of use. Here, in this ratio, polar oil means polar oil including component (C), that is, all polar oils including liquid polar oils, solid polar oils, and semi-solid polar oils when blended. Therefore, the content of polar oil means the total amount of polar oil. In addition, oily components mean the entire oily components including polar oils and non-polar oils. The oily components do not include water, surfactants, water-soluble polymers, inorganic salts, and organic salts. This ratio (polar oil/total amount of oily components) may be 0.3 or more, 0.5 or more, or 0.8 or more. Note that since polar oil is a component of the oily components, the upper limit of this ratio (polar oil/total amount of oily components) is 1 (when all of the oily components are polar oils), that is, this ratio (polar oil/total amount of oily components) is 1 or less.

In the present emulsion composition, the ratio of the total content of components (A) and (B) to the total amount of oily components (((A) + (B)) / total amount of oily components) is preferably 0.01 or more, more preferably 0.03 or more, and even more preferably 0.05 or more, in weight ratio. By increasing this ratio (((A) + (B)) / total amount of oily components), the oily components can be emulsified with a more sufficient amount of components (A) and (B), and the emulsion stability can be improved. As above, the oily components mean the entire oily components including polar oils and non-polar oils, and do not include water, surfactants, water-soluble polymers, inorganic salts, or organic salts. This ratio (((A) + (B)) / total amount of oily components) may be 0.06 or more, or 0.08 or more, or 0.09 or more. However, if this ratio ((A)+(B))/total amount of oily components) is too high, the total amount of components (A) and (B) in the emulsion composition may exceed the amount required for emulsification and become excessive, or the content of the oily components may become relatively low, resulting in a poor feel when used. For example, this ratio ((A)+(B))/total amount of oily components) may be preferably 1 or less, more preferably 0.8 or less, and even more preferably 0.6 or less, but is not limited to this.

In one embodiment, the present emulsion composition is preferably an emulsion cosmetic (i.e., an oil-in-water emulsion cosmetic). In that case, a cosmetic with excellent emulsion stability and good usability can be obtained. Cosmetics include skin cosmetics and hair cosmetics, but the present emulsion composition is particularly preferably an emulsion composition for skin, particularly a skin cosmetic (skin cosmetic). In addition, the present emulsion composition can be applied to emulsion compositions for all purposes, including skin care products and makeup products. The present emulsion composition can provide a smooth feel during use (during application), good after-skin feel, reduce stickiness and tightness after application, and provide a film-like feel.

As long as the skin cosmetic is in the form of an oil-in-water emulsion, there is no particular limitation on the skin cosmetic, and it can be used as a cosmetic for various purposes. Examples include lotions, creams, beauty essences, hand creams, eye creams, body creams, makeup cosmetics, makeup bases, and foundations. Methods for using skin cosmetics include applying them to the hands or fingers, using cotton, impregnating nonwoven fabric, and spraying or misting them.

There are no particular limitations on the hair cosmetic product, so long as it is in the form of an oil-in-water emulsion, and it can be used as a cosmetic product for a variety of purposes. Examples include cosmetics such as hair cream, hair wax, hair rinse, hair mask, and hair treatment. Methods for using hair cosmetics include applying it to the hands or fingers, or spraying it on with a spray or mist.

The present emulsion composition can be produced by mixing the above-mentioned components. For example, a method can be used in which an aqueous component that has been preheated and mixed and an oil component that has been preheated and mixed are mixed and emulsified, and then cooled. Of course, the method for producing the present emulsion composition is not limited to this.

This specification discloses a method for stabilizing an emulsion in the production of an oil-in-water emulsion composition, which comprises mixing components (A) to (F). As described above, the emulsion can be stabilized by adding behendimonium ethyl stearyl phosphate. The application method and application means are not particularly limited, but are preferably as described above.

As described above, in one embodiment of the present invention, by using a hydrophilic surfactant (particularly a phospholipid) (component (A)) as the main emulsifier and behendimonium ethyl stearyl phosphate (component (B)) as the emulsifying aid, it is possible to provide an oil-in-water emulsion composition (particularly a cosmetic product) that contains (particularly a high content of) a liquid polar oil (component (C)), which has high emulsion stability, a smooth feel, and an excellent film-like feel (non-stickiness) on the skin after application. Furthermore, when a higher alcohol (component (G)) is further added, in addition to obtaining the effect of improving emulsion stability and improving usability due to the higher alcohol, it is possible to suppress viscosity changes and gelation caused by the higher alcohol, and it is possible to provide a stable oil-in-water emulsion composition.

The oil-in-water emulsion composition according to the present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Tables 1 and 2 show the components of the emulsion compositions (emulsion cosmetics, specifically emulsions) of Examples 1 to 24 and Comparative Examples 1 to 6, as well as the amounts (wt %) of the components, the weight ratio relationships, and the results of evaluation of stability, etc.

The examples and comparative examples shown in Tables 1 and 2 were produced by the following methods.
Production Method of Examples 1 to 11 and 16 to 24 (1) Components (A), (B), (C), (D), (G) and (H) were mixed (for Example 8, liquid paraffin was further mixed), and dissolved by heating at 75°C to obtain a solution (oil phase).
(2) Components (E) and (F) and sodium hydroxide were mixed and dissolved by heating at 75° C. to obtain a solution (aqueous phase).
(3) The solution (1) above was added to the solution (2) above and mixed to emulsify.
(4) The mixture of (3) above was cooled to obtain an emulsion composition.

Manufacturing Method of Examples 12 to 15 (1) Components (B), (C), (D), (G) and (H) were mixed and dissolved by heating at 75° C. to obtain a solution.
(2) Components (A), (E), (F) and sodium hydroxide were mixed and dissolved by heating at 75° C. to obtain a solution (aqueous phase).
(3) The solution (1) above was added to the solution (2) above and mixed to emulsify.
(4) The mixture of (3) above was cooled to obtain an emulsion composition.

Production Methods of Comparative Examples 1 to 6 Comparative Example 1 was produced in the same manner as in Example 1, except that component (A) was not blended, to obtain an emulsion composition.
In Comparative Example 2, an emulsion composition was obtained in the same manner as in Example 12, except that polyoxyethylene hydrogenated castor oil (HLB 10.5) was used instead of component (A).
In Comparative Example 3, an emulsion composition was obtained in the same manner as in Example 1, except that component (B) was not blended.
In Comparative Example 4, an emulsion composition was obtained in the same manner as in Example 1, except that the component (E) and sodium hydroxide were not added.
In Comparative Example 5, an emulsion composition was obtained in the same manner as in Example 1, except that component (D) was not added.
In Comparative Example 6, an emulsion composition was obtained in the same manner as in Example 8, except that component (C) was not added.

The emulsion compositions of the Examples and Comparative Examples shown in Tables 1 and 2 were evaluated by the following methods.
Emulsion Stability The emulsion composition was left to stand in a thermostatic chamber at 40° C. for one month (30 days), and the presence or absence of changes in appearance such as separation was visually observed. The number of days until a change in appearance (phase separation, etc.) was observed was counted.
◎: No change in appearance was observed up to 30 days. ○: A change in appearance was observed between 14 and 29 days. △: A change in appearance was observed between 2 and 13 days. ×: A change in appearance was observed between 1 day and 1 day after being left in a thermostatic chamber.

Suppression of Crystals Immediately After Production The emulsion composition immediately after production was visually observed for the presence or absence of crystals.
◎: No crystals were found at all. ○: A small amount of crystals were found, but they were so small that they were not noticeable when touching the skin. △: A small amount of crystals were found, but they were noticeable when touching the skin (their presence was noticeable).
×: Crystals are clearly observed

Suppression of Crystallization Over Time The emulsion composition was allowed to stand in a thermostatic chamber at 40° C. for one week (7 days), and the presence or absence of crystallization was visually observed.
◎: No crystals were found at all. ○: A small amount of crystals were found, but they were so small that they were not noticeable when touching the skin. △: A small amount of crystals were found, but they were noticeable when touching the skin (their presence was noticeable).
×: Crystals are clearly observed

Smoothness during use Twenty expert evaluation panel members rated the samples on a four-point scale using the absolute criteria (scores) below, and the average score was calculated from the total scores of all panel members, and judged according to the following criteria. Specifically, each sample was placed on the skin and evaluated for smoothness (good spreadability) when spread.
<Score>
3: Sufficient smoothness (spreadability) 2: Smoothness (spreadability) is felt, but slightly insufficient 1: Slightly insufficient smoothness (spreadability) 0: Insufficient smoothness (spreadability) <Evaluation criteria>
(Average score): (Judgment)
2.5 points or more: ◎
2 points or more and less than 2.5 points: ○
1 point or more but less than 2 points: △
Less than 1 point: ×

(Post-skin) Appropriate film-like feel A panel of 20 experts rated the skin on a four-point scale using the absolute criteria (scores) below, and the average score was calculated from the total score of all panelists, and judged according to the following criteria. Specifically, the skin was evaluated on whether it felt sticky or tight after applying and spreading each sample on the skin, and whether it felt like a film.
<Score>
3: Neither sticky nor tight feeling is felt, and the filmy feeling is sufficient. 2: Neither sticky nor tight feeling is felt, but the filmy feeling is slightly insufficient. 1: Either sticky or tight feeling is felt, and the filmy feeling is slightly insufficient. 0: Either sticky or tight feeling is felt, and the filmy feeling is insufficient. <Evaluation criteria>
(Average score): (Judgment)
2.5 points or more: ◎
2 points or more and less than 2.5 points: ○
1 point or more but less than 2 points: △
Less than 1 point: ×

Results Examples 1 to 24, which contain components (A) to (F), did not receive an X rating in any of the evaluation items (emulsion stability, inhibition of crystallization immediately after production, inhibition of crystallization over time, smoothness during use, and (skin) moderate film-like feel after use), and thus had a good balance of emulsion stability and feel after use. On the other hand, Comparative Examples 1 to 6 received an X rating in the evaluation item of "(skin) moderate film-like feel after use," and Comparative Examples 3 to 5 also received an X rating in "emulsion stability,""inhibition of crystallization immediately after production," and "inhibition of crystallization over time."

Example (Formulation Example)
The following examples that can be used as cosmetics were produced. In the following examples, the "balance" in the blending amount (wt%) means that the total amount is 100 wt%.

Example 25: Emulsion (Components) (% by weight)
1. Hydrogenated soybean phospholipid (hydrogenated soybean lecithin) (ingredient A) 1.0%
2. Behendimonium ethyl phosphate stearyl (ingredient B) 1.0%
3. PG dicaprylate (ingredient C) 5.0%
4. Glyceryl tri-2-ethylhexanoate (ingredient C) 3.0%
5. Isotridecyl isononanoate (component C) 1.0%
6. Isostearic acid (component C) (component H) 2.0%
7. Ethyl oleate (ingredient C) 0.5%
8. Jojoba oil (ingredient C) 1.0%
9. Glyceryl stearate (ingredient D) 1.5%
10. Behenyl alcohol (ingredient G) 0.5%
11. Cetostearyl alcohol (ingredient G) 1.5%
12. Squalane 3.0%
13. Vaseline 0.5%
14. Octyldodecyl/Phytosteryl/Behenyl Lauroyl Glutamate
0.5%
15. Dimer dilinoleic acid (phytosteryl/isostearyl/cetyl/stearyl/behenyl) 0.3%
16. Ascorbyl tetrahexyldecanoate (ingredient C) 0.2%
17. Carbomer (ingredient E) 0.1%
18. (Acrylates/alkyl acrylate (C10-30) crosspolymer) (component E) 0.1%
19. Xanthan gum (ingredient E) 0.1%
20. 1,3-butylene glycol 8.0%
21. Dipropylene glycol 3.0%
22. Sodium hydroxide 0.06%
23. Ethanol 3.0%
24. Phenoxyethanol 0.5%
25. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, cherry blossom extract, polyquaternium-51, rose multiflora fruit extract, rosehip flower extract, rosa robur extract, water-soluble collagen, royal jelly extract, angelica root extract, rosa centifolia flower extract, rosa damask flower water, rosemary leaf extract, maltitol fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients)
1.0%
26. Purified water (ingredient F) remaining

(Production method)
(1) Components 1 to 16 were dissolved by heating at 75°C to obtain a solution (oil phase).
(2) Components 17 to 21 were mixed, a portion of component 26 was added, and the mixture was heated to 75°C and mixed to obtain a solution (aqueous phase).
(3) Component 22 and the remaining component 26 were added to the solution of (2) above to obtain a solution (aqueous phase).
(4) The above (1) was added to the solution of the above (3) and emulsified to obtain an emulsion.
(5) After cooling the emulsion of (4) above, ingredients 23 and 24 that had been uniformly mixed were added, and then ingredient 25 was added and mixed to obtain an emulsion composition.
(evaluation)
The emulsion of Example 25 was confirmed to have good emulsion stability and a good feel during use (smoothness during use, feeling on the skin after use, etc.).
The weight ratio relationships were as follows: (D)/(B) was 1.5; (B)/(A) was 1.0; the oily components were components 3 to 16, totaling 20.5%. Among the oily components, the components other than components 12 and 13 were polar oils, totaling 17.0%. Thus, polar oil/total amount of oily components was 0.829; ((A)+(B))/total amount of oily components was 0.098.

Example 26: Cream (Ingredients) (% by weight)
1. Hydrogenated soy lysophospholipid (hydrogenated soy lysolecithin) (ingredient A) 0.5%
2. Sodium N-stearoyl-N-methyl taurate (ingredient A) 0.2%
3. Polyethylene glycol monostearate (ingredient A) 0.1%
4. Behendimonium ethyl phosphate stearyl (ingredient B) 1.2%
5. Polyoxyethylene alkyl (12-15) ether phosphate (8 E.O.)
0.01%
6. Sodium N-stearoyl-L-glutamate (ingredient A) 0.05%
7. Stearic acid hydrogenated castor oil 1.0%
8. PG dicaprylate (ingredient C) 3.0%
9. Dipentaerythrityl hexa(hydroxystearic acid/stearic acid/rosin acid)
1.0%
10. Di(isostearyl/phytosteryl) dilinoleate (ingredient C) 1.0%
11. Polyglyceryl-2 diisostearate (component C) 2.0%
12. 2-Cetyl ethylhexanoate (ingredient C) 2.0%
13. Ethyl oleate (ingredient C) 0.2%
14. Meadowfoam oil (ingredient C) 2.0%
15. Olive oil (ingredient C) 1.5%
16. Behenyl alcohol (ingredient G) 1.5%
17. Cetostearyl alcohol (ingredient G) 2.5%
18. Glyceryl stearate (ingredient D) 1.5%
19. Hydrogenated rapeseed oil fatty acid glycerides (component D) 0.5%
20. Squalane 2.0%
21. Liquid paraffin 3.0%
22. Dimethicone 0.5%
23. Dextrin isostearate 0.1%
24. Tocopherol acetate (ingredient C) 0.01%
25. (Acrylates/C10-30 alkyl acrylate crosspolymer) (component E) 0.2%
26. Xanthan gum (ingredient E) 0.1%
27. Carrageenan (ingredient E) 0.01%
28. Hydroxypropyl methylcellulose (ingredient E) 0.01%
29. Sodium acrylate/sodium acryloyldimethyltaurate copolymer (component E) 0.1%
30. 1,3-butylene glycol 6.0%
31. Glycerin 1.0%
32. Diglycerin 1.0%
33. Sodium hydroxide 0.06%
34. Ethanol 3.0%
35. Phenoxyethanol 0.1%
36. Methylparaben 0.05%
37. Mixture of hydrolyzed conchiolin solution, gentiana extract, hydrolyzed silk solution, hydrolyzed rice extract, seaweed extract, L-serine, Iwashobu leaf extract, Artemisia capillaris flower extract, Alpinia speciosa leaf extract, Saccharomyces cerevisiae extract, Pomegranate fruit extract, Pomegranate peel extract, Arisaema gracilis fruit extract, Eggplant fruit extract, Harpagophytum root extract, Parsley extract, Royal jelly extract, Rosa alba flower extract, Avocado extract, Gynostemma pentaphyllum extract, Chamomilla recutita water, Bilberry fruit extract, Apple extract, Lemongrass extract, Hitotsujyū extract, Asparagus extract, Artemia extract, Guava extract, Coffee extract, Taiso extract, Grape leaf extract, and Sanguisorba officinalis extract (mixture of beauty ingredients)
2.0%
38. Purified water (ingredient F) remaining

(Production method)
(1) Components 1, 4, and 7 to 24 were heated and dissolved at 75°C to obtain a solution (oil phase).
(2) Components 2, 3, 5, 6, and 25 to 32 were mixed, a portion of component 38 was added, and the mixture was heated to 75° C. and mixed to obtain a solution (aqueous phase).
(3) Component 33 and the remaining component 38 were added to the solution of (2) above to obtain a solution (aqueous phase).
(4) The above (1) was added to the solution of the above (3) and emulsified to obtain an emulsion.
(5) After cooling the emulsion of (4) above, ingredients 34 to 36 that had been uniformly mixed were added, and then ingredient 37 was added and mixed to obtain an emulsion composition.
(evaluation)
The cream of Example 26 was confirmed to have good emulsion stability and good feel during use (smoothness during use, skin feel after use, etc.).
The weight ratio relationships were as follows: (D)/(B) was 1.67; (B)/(A) was 1.41; the oily components were components 7 to 24, totaling 25.31%; and the oily components were components other than components 20 to 22, totaling 19.81%. Thus, polar oil/total amount of oily components was 0.783. ((A)+(B))/total amount of oily components was 0.081.

Example 27: Foundation (Components) (% by weight)
1. Hydrogenated soybean phospholipid (hydrogenated soybean lecithin) (ingredient A) 1.5%
2. Polyoxyethylene sorbitan monostearate (20 E.O.) (Component A)
0.5%
3. Behendimonium ethyl phosphate stearyl (ingredient B) 1.0%
4. 2-Cetyl ethylhexanoate (ingredient C) 1.0%
5. Glyceryl tri-2-ethylhexanoate (ingredient C) 1.0%
6. Isostearic acid (component C) (component H) 2.0%
7. Ethylhexyl methoxycinnamate (ingredient C) 5.0%
8. Diethylaminohydroxybenzoylhexyl benzoate 1.0%
9. Glyceryl stearate (ingredient D) 0.5%
10. Behenyl alcohol (ingredient G) 0.4%
11. Cetostearyl alcohol (ingredient G) 0.6%
12. Squalane 4.0%
13. Liquid paraffin 6.0%
14. Dimethicone 0.5%
15. Stearic acid (ingredient H) 1.5%
16. (Acrylates/C10-30 alkyl acrylate crosspolymer) (component E) 0.2%
17. Carbomer (ingredient E) 0.1%
18. Xanthan gum (ingredient E) 1.5%
19. 1,3-butylene glycol 6.0%
20. Triethanolamine 2.0%
21. Ethanol 3.0%
22. Phenoxyethanol 0.3%
23. Titanium oxide treated with 0.5% lecithin and 3% aluminum hydroxide (average particle size: 0.25 μm) 6.0%
24. Dimethicone, aluminum hydroxide, hydrated silica-treated titanium dioxide (average particle size: 0.030 μm) 1.0%
25. Lecithin 0.5% treated red iron oxide 0.3%
26. Lecithin 0.5% treated yellow iron oxide 2.0%
27. Lecithin 0.5% treated black iron oxide 0.2%
28. Talc treated with 1% lecithin (average particle size: 10.5 μm) 3.0%
29. Zinc oxide (average particle size 0.3 μm) 3.0%
30. Silica (Godball E-90C: Suzuki Oil Industries Co., Ltd.) 0.5%
31. Silica (Silosphere C-1504: Fuji Silysia Chemical Ltd.)
0.5%
32. Sorbitan sesquioleate 0.5%
33. Polyoxyethylene sorbitan monooleate (20 E.O.) (Component A)
0.8%
34. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, satozakura flower extract, polyquaternium-51, rosa multiflora fruit extract, rugosa rose flower extract, rosa robur extract, water-soluble collagen, royal jelly extract, angelica root extract, rosa centifolia flower extract, rosa damask flower water, rosemary leaf extract, maltose aceroides fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients)
1.0%
35. Purified water (ingredient F) remaining

(Production method)
(1) Components 1 to 15 were dissolved by heating at 75°C to obtain a solution (oil phase).
(2) Components 16 to 19 were mixed, a portion of component 35 was added, and the mixture was heated to 75°C and mixed to obtain a solution (aqueous phase).
(3) Component 20 and the remaining component 35 were added to the solution of (2) above to obtain a solution (aqueous phase).
(4) The above (1) was added to the solution of the above (3) and emulsified to obtain an emulsion.
(5) After cooling the emulsion of (4) above, uniformly mixed components 21 and 22 were added, followed by component 34, and then uniformly dispersed components 23 to 33 were added and mixed to obtain an emulsion composition.
(evaluation)
The foundation of Example 27 was confirmed to have good emulsion stability and good feel during use (smoothness during use, feeling on the skin after use, etc.).
The weight ratio relationships were as follows: (D)/(B) was 0.5; (B)/(A) was 0.357; the oily components were components 4 to 15, totaling 23.5%; and the oily components were all components other than components 12 to 14, totaling 13%. Thus, polar oil/total amount of oily components was 0.553. ((A)+(B))/total amount of oily components was 0.162.

Example 28: Sunscreen (Ingredients) (% by weight)
1. Hydrogenated soybean phospholipid (hydrogenated soybean lecithin) (ingredient A) 0.5%
2. Polyoxyethylene sorbitan monooleate (20 E.O.) (Component A)
1.0%
3. Behendimonium ethyl phosphate stearyl (ingredient B) 2.0%
4. PEG-5 Phytosterol 0.6%
5. PEG-30 Phytosterol (Component A) 0.4%
6. Isostearic acid (component C) (component H) 2.0%
7. Ethylhexyl methoxycinnamate (ingredient C) 7.0%
8. Diethylamino hydroxybenzoyl hexyl benzoate 2.0%
9. Polysilicone-15 (component C) 3.0%
10. Bisethylhexyloxyphenol methoxyphenyl triazine
1.5%
11. Glyceryl stearate (ingredient D) 1.0%
12. Behenyl alcohol (ingredient G) 1.5%
13. Cetostearyl alcohol (ingredient G) 0.5%
14. Tocopherol acetate (ingredient C) 0.1%
15. Ceramide 3 0.1%
16. Ascorbyl tetrahexyldecanoate (ingredient C) 0.1%
17. Squalane 2.0%
18. Liquid paraffin 1.0%
19. Diphenylsiloxyphenyl trimethicone 3.0%
20. Dimethicone 0.5%
21. Stearic acid (ingredient H) 1.0%
22. (Acrylates/alkyl acrylate (C10-30) crosspolymer) (component E) 0.2%
23. Sodium acrylate/sodium acryloyldimethyltaurate copolymer (component E) 0.4%
24. 1,3-butylene glycol 6.0%
25. Glycerin 2.0%
26. Methylene bisbenzotriazolyl tetramethylbutylphenol 1.0%
27. Sodium hydroxide 0.06%
28. Ethanol 5.0%
29. Phenoxyethanol 0.2%
30. Fragrance 0.1%
31. Isopropyl titanium triisostearate/(dimethicone/methicone) copolymer treated zinc oxide (average particle size 0.025 μm) 15.0%
32. (Vinyl dimethicone/methicone silsesquioxane) crosspolymer
0.5%
33. Polyhydroxystearic acid (component C) 2.5%
34. Sorbitan sesquioleate 0.5%
35. Mixture of Elderberry Flower Extract, Tea Leaf Extract, Tea Extract, Jasminum Sambac Flower Extract, Polyquaternium-51, Rosa Multiflora Fruit Extract, Rugosa Rusca Flower Extract, Rosa Izayoi Extract, Water-Soluble Collagen, Royal Jelly Extract, Angelica acutiloba Root Extract, Rosa Centifolia Flower Extract, Rosa Damascena Flower Water, Rosemary Leaf Extract, Acerola Fruit Extract, Acetyl Glutamic Acid, Theanine, Glycine, Hydrolyzed Hyaluronic Acid, and Sodium Hyaluronate (Mixture of Cosmetic Ingredients)
1.0%
36. Purified water (ingredient F) remaining

(Production method)
(1) Components 1 to 21 were dissolved by heating at 75°C to obtain a solution (oil phase).
(2) Components 31 to 34 uniformly dispersed in (1) above were added and mixed to obtain a solution (oil phase).
(3) Components 22 to 25 were mixed, and a portion of component 36 was added to obtain a solution (aqueous phase).
(4) To the solution of (3) above, component 27 and most of component 36 were added, and the mixture was heated to 75°C and mixed to obtain a solution (aqueous phase).
(5) The above (2) was added to the solution of the above (4) and emulsified to obtain an emulsion.
(6) After cooling the emulsion of (5) above, component 26 and the remaining component 36 were added, and components 28 to 30 and 35 that had been uniformly mixed were added and mixed to obtain an emulsion composition.
(evaluation)
The sunscreen of Example 28 was confirmed to have good emulsion stability and good feel during use (smoothness during use, feeling on the skin after use, etc.).
The weight ratio relationships were as follows: (D)/(B) was 0.5; (B)/(A) was 1.053; the oil components were components 6 to 21, totaling 26.3%; and the oil components other than components 17 to 20 were polar oils, totaling 19.8%. Thus, polar oil/total amount of oil components was 0.753. ((A)+(B))/total amount of oil components was 0.148.

Claims (13)

The following components (A) to (F):
(A) 0.01 to 5% by weight of one or more surfactants selected from the group consisting of nonionic surfactants having an HLB of 12.0 or more and ionic surfactants,
(B) 0.01 to 10% by weight of behendimonium ethyl stearyl phosphate,
(C) 1 to 20 weight percent of a liquid polar oil;
(D) 0.1 to 10% by weight of a fatty acid glyceryl,
(E) 0.01 to 5% by weight of a water-soluble polymer, and
(F) water,
An oil-in-water emulsion composition comprising:
An oil-in-water emulsion composition, wherein component (E) comprises one or more selected from the group consisting of acrylates/alkyl acrylate (C10-30) crosspolymers and carbomers. The oil-in-water emulsion composition according to claim 1, wherein the ratio of the content of component (D) to the content of component (B) ((D)/(B)) is 0.4 or more by weight. The oil-in-water emulsion composition according to claim 1 or 2, wherein at least one of the components (A) is a phospholipid. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the ratio of the content of component (B) to the content of component (A) ((B)/(A)) is 0.2 or more by weight. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the ratio of the total content of polar oils including component (C) to the total amount of oily components (polar oil/total amount of oily components) is 0.2 or more by weight. The oil-in-water emulsion composition according to any one of claims 1 to 5, wherein the ratio of the total content of components (A) and (B) to the total amount of oily components (((A) + (B))/total amount of oily components) is 0.05 or more by weight. The oil-in-water emulsion composition according to any one of claims 1 to 6, wherein component (C) is a liquid polar oil selected from synthetic or natural fatty acids, fatty acid esters thereof, or higher alcohols, which are in a liquid form at room temperature. The oil-in-water emulsion composition according to any one of claims 1 to 7, wherein component (D) is glyceryl stearate. The oil-in-water emulsion composition according to any one of claims 1 to 8 , further comprising a higher alcohol as component (G). The oil-in-water emulsion composition according to any one of claims 1 to 9 , further comprising a fatty acid as component (H). The oil-in-water emulsion composition according to any one of claims 1 to 10 , which is an emulsion cosmetic. The oil-in-water emulsion composition according to any one of claims 1 to 11 , which is for use on the skin. The following components (A) to (F):
(A) 0.01 to 5% by weight of one or more surfactants selected from the group consisting of nonionic surfactants having an HLB of 12.0 or more and ionic surfactants,
(B) 0.01 to 10% by weight of behendimonium ethyl stearyl phosphate,
(C) 1 to 20 weight percent of a liquid polar oil;
(D) 0.1 to 10% by weight of a fatty acid glyceryl,
(E) 0.01 to 5% by weight of a water-soluble polymer, and
(F) water,
A method for stabilizing an emulsion in the production of an oil-in-water emulsion composition, comprising mixing
A method for emulsion stabilization, wherein component (E) comprises one or more selected from the group consisting of acrylates/alkyl acrylate (C10-30) crosspolymers, and carbomers.