JP6626387B2 - Emulsion composition for skin - Google Patents

Description

  The present invention relates to an emulsion composition for skin.

  From the viewpoint of imparting an excellent moisturizing effect to the emulsified composition used for the skin, a feeling of use is felt such that a certain amount of weight is felt at the time of application and a high-density feel can be obtained (so-called “thick” feel). ), And various higher alcohols such as cetyl alcohol and stearyl alcohol are widely used from the viewpoint of imparting storage stability (emulsion stability) (for example, see Patent Documents 1 and 2). .

  When these higher alcohols are incorporated into a high-viscosity emulsified composition having no fluidity such as cream, they exhibit remarkably excellent storage stability (emulsion stability). However, when it is incorporated into a fluid and low-viscosity emulsified composition such as an emulsion, there is a problem in that the viscosity increases over time, which adversely affects the feeling of use such as stickiness compared to the initial stage of use.

  When the amount of the higher alcohol blended in the low-viscosity emulsion composition is reduced, the increase in viscosity over time can be suppressed and the storage stability (emulsion stability) can be improved, but the superior moisturizing effect unique to the higher alcohol, There is a problem that a rich feeling of use cannot be obtained.

  Patent Documents 3 and 4 and the like disclose an emulsion composition having stability over time even at a low viscosity by using a specific nonionic surfactant in an emulsion composition containing a higher alcohol. However, in order to obtain a low-viscosity emulsion composition that satisfies both excellent feeling in use and storage stability (emulsion stability), it is necessary to pay close attention to the amount of the higher alcohol and the like. There is still room for improvement.

JP 2015-224223 A JP 2014-47158 A JP-A-2006-160618 JP 2008-247866 A

  The present invention provides an emulsion composition for skin that is excellent in storage stability (emulsification stability), has a rich use sensation, imparts a smooth feel without stickiness, and exhibits an excellent moisturizing effect. The task is to provide things.

  The present inventor has conducted extensive studies and found that a fatty acid ester oil which is solid at room temperature, a fatty acid ester oil which is liquid at room temperature and has a branched chain structure, a nonionic surfactant, and a solid at room temperature. It has been found that the above problems can be solved by using the same in combination with polyethylene glycol, and the present invention has been completed.

That is, the present invention provides an emulsion composition for skin, comprising the following components A, B, C and D.
Component A: fatty acid ester oil which is solid at room temperature Component B: fatty acid ester oil which is liquid at room temperature and has a branched chain component Component C: nonionic surfactant Component D: polyethylene glycol which is solid at room temperature

  It is preferable that the component A is an ester oil of a linear fatty acid and a linear higher alcohol.

  It is preferable that the component B is an ester oil of a branched fatty acid and a polyhydric alcohol and / or an ester oil of a branched fatty acid and a branched higher alcohol.

  It is preferable that the mass content ratio of the component A and the component B is A: B = 1: 2 to 1:10.

It is preferable that the above-mentioned emulsion composition for skin further contains the following component E.
Component E: thickening polymer

  It is preferable that the above-mentioned emulsion composition for skin does not contain a higher alcohol, or contains a higher alcohol, and the content of the higher alcohol is 0.5% by mass or less.

  The emulsion composition for skin of the present invention is excellent in storage stability (emulsion stability), and imparts a smooth feeling without stickiness while having a rich feeling of use, and has an excellent moisturizing effect. Can be demonstrated.

  The emulsion composition for skin of the present invention comprises a fatty acid ester oil which is solid at room temperature, a fatty acid ester oil which is liquid at room temperature, and has a branched chain structure, a nonionic surfactant, and a solid at room temperature. Of polyethylene glycol as an essential component. Further, the emulsion composition for skin of the present invention preferably contains a thickening polymer. Furthermore, the emulsion composition for skin of the present invention may contain other components. In addition, in this invention, "room temperature" means the temperature of 1-30 degreeC.

  In the present specification, the "fatty acid ester oil which is solid at room temperature" is "Component A"; the "fatty acid ester oil which is liquid at room temperature and has a branched chain structure" is "Component B"; The "nonionic surfactant" may be referred to as "Component C"; the "polyethylene glycol solid at room temperature" as "Component D"; and the "thickening polymer" as "Component E".

  The components that can be contained in the emulsion composition for skin of the present invention, that is, components A to E and other components, may be used alone or in combination of two or more.

[Component A]
Component A is a fatty acid ester oil which is solid at room temperature. Examples of the component A include an ester oil of a linear fatty acid and a higher linear alcohol, an ester oil of a linear fatty acid and a polyhydric alcohol, and the like.

  The straight-chain fatty acid is not particularly limited, but is preferably a saturated straight-chain fatty acid having 12 to 22 carbon atoms. For example, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, araquine Acids, behenic acid and the like.

  The straight-chain higher alcohol is not particularly limited, but is preferably a saturated straight-chain higher alcohol having 12 to 22 carbon atoms, such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol.

  Examples of the polyhydric alcohol include, but are not particularly limited to, for example, ethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, neopentyl glycol, polyethylene glycol, highly polymerized polyethylene glycol, 1,3-butylene glycol, glycerin, and concentrated glycerin. , Diglycerin, triglycerin, glucose, maltose, maltitol, sucrose, mannitol, sorbitol, pentaerythritol (pentaerythritol, pentaerythritol, pentaerythritol), 1,2-pentanediol, 1,2-hexanediol, , 2-octanediol, 1,2-decanediol and the like.

  Specific examples of the ester oil of the above straight-chain fatty acid and straight-chain higher alcohol include myristyl myristate, cetyl myristate, cetyl palmitate, stearyl stearate, and behenyl behenate. Further, specific examples of the ester oil of the straight-chain fatty acid and the polyhydric alcohol include pentaerythritol tetramyristate, pentaerythritol tetrastearate, and pentaerythritol distearate.

  The component A is preferably an ester oil of a straight-chain fatty acid and a straight-chain higher alcohol from the viewpoint of having a rich feeling of use and exhibiting an excellent moisturizing effect. An ester oil of a chain saturated fatty acid and a linear saturated higher alcohol having 12 to 22 carbon atoms is more preferable, and stearyl stearate and cetyl myristate are still more preferable.

  In addition, a commercial item can be used as component A. Commercially available products of stearyl stearate include, for example, trade name: AMREPSS SS (manufactured by Higher Alcohol Industry Co., Ltd.), trade name: Exepearl SS (manufactured by Kao Corporation), trade name: EMALEX CC-18 (manufactured by Japan Emulsion Co., Ltd. ), Trade name: UNISTAR M-9676 (manufactured by NOF CORPORATION), trade name: NJELUB SS (manufactured by Nippon Rika Co., Ltd.) and the like. Commercial products of cetyl myristate include, for example, trade name: Sperm Acet (manufactured by NOF CORPORATION) and the like.

  The content of the component A is not particularly limited, but from the viewpoint of having a rich feeling of use and exhibiting an excellent moisturizing effect, 1.0 to 2.0% by mass of the emulsion composition for skin of the present invention in 100% by mass. 5 mass% is preferable, and 1.5 to 2.0 mass% is more preferable. The content of the component A is the total content of all the components A in the emulsion composition for skin of the present invention.

[Component B]
Component B is a fatty acid ester oil that is liquid at room temperature and has a branched chain structure. As the component B, for example, an ester oil of a branched fatty acid and a polyhydric alcohol, an ester oil of a branched fatty acid and a branched higher alcohol, an ester oil of a branched fatty acid and a straight higher alcohol, and a mixture of a straight fatty acid and a branched higher alcohol Ester oil and the like.

  The branched fatty acid is not particularly limited, but is preferably a saturated or unsaturated branched chain fatty acid having 8 to 18 carbon atoms, for example, 2-ethylhexanoic acid (octanoic acid), dimethyloctanoic acid, isononanoic acid, and isopalmitic acid. , Isostearic acid and the like.

  The straight-chain fatty acid is not particularly limited, but is preferably a saturated or unsaturated straight-chain fatty acid having 12 to 22 carbon atoms, for example, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearin Acids, oleic acid, arachiic acid, behenic acid and the like.

  Examples of the polyhydric alcohol include, but are not particularly limited to, for example, ethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, neopentyl glycol, polyethylene glycol, highly polymerized polyethylene glycol, 1,3-butylene glycol, glycerin, and concentrated glycerin. , Diglycerin, triglycerin, glucose, maltose, maltitol, sucrose, mannitol, sorbitol, pentaerythritol (pentaerythritol, pentaerythritol, pentaerythritol), 1,2-pentanediol, 1,2-hexanediol, , 2-octanediol, 1,2-decanediol and the like.

  The branched higher alcohol is not particularly limited, but is preferably a saturated or unsaturated branched higher alcohol having 8 to 22 carbon atoms, for example, 2-ethylhexyl alcohol, isononyl alcohol, isodecyl alcohol, isotridecyl alcohol, -Hexyldecyl alcohol, isocetyl alcohol, isostearyl alcohol, octyldodecyl alcohol and the like.

  The straight-chain higher alcohol is not particularly limited, but is preferably a saturated or unsaturated straight-chain higher alcohol having 12 to 22 carbon atoms. For example, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, oleyl Alcohol, behenyl alcohol and the like.

  Specific examples of the ester oil of the branched fatty acid and the polyhydric alcohol include glyceryl tri-2-ethylhexanoate, glyceryl triisopalmitate, glyceryl triisostearate, pentaerythritol tetraisostearate (pentaerythritol tetraisostearate) Pentaerythritol tetraisostearate), pentaerythritol tetra-2-ethylhexanoate (pentaerythritol tetra-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate) and the like.

  Specific examples of the ester oils of the above branched fatty acids and branched higher alcohols include 2-hexyldecyl 2-ethylhexanoate, isostearyl 2-ethylhexanoate, hexyldecyl dimethyloctanoate, octyldecyl dimethyloctanoate, and isopalmitic acid. Examples include 2-ethylhexyl, isocetyl isostearate, isostearyl isostearate, octyldodecyl isostearate, isononyl isononanoate, isotridecyl isononanoate, and ethylhexyl isononanoate.

  Specific examples of the ester oil of the branched fatty acid and the straight-chain higher alcohol include cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, and stearyl 2-ethylhexanoate.

  Specific examples of ester oils of the above straight-chain fatty acids and branched higher alcohols include isostearyl laurate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, octyl dodecyl myristate, 2-ethylhexyl palmitate, and isocetyl palmitate. , Isostearyl palmitate, 2-ethylhexyl stearate, isocetyl stearate, isodecyl oleate, octyl dodecyl oleate, and the like.

  The component B is an ester oil of a branched fatty acid and a polyhydric alcohol, and / or an ester oil of a branched fatty acid and a branched higher alcohol, from the viewpoint of imparting a smooth feel without stickiness and exhibiting an excellent moisturizing effect. It is preferable to use ester oils of a branched saturated fatty acid having 8 to 18 carbon atoms and a polyhydric alcohol, and ester oils of a branched saturated fatty acid having 8 to 18 carbon atoms and a branched saturated higher alcohol having 12 to 22 carbon atoms. More preferred.

  As the ester oil of a branched saturated fatty acid having 8 to 18 carbon atoms and a polyhydric alcohol, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, and pentaerythritol tetraisostearate are particularly preferable. As the ester oil of a branched saturated fatty acid having 8 to 18 carbon atoms and a branched saturated higher alcohol having 12 to 22 carbon atoms, isononyl isononanoate is particularly preferable.

  In addition, as component B, a commercial item can be used. Commercial products of glyceryl tri-2-ethylhexanoate include, for example, trade name: Exepearl TGO (manufactured by Kao Corporation) and the like. Commercial products of pentaerythritol tetraisostearate include, for example, Sarakos 5418V (manufactured by Nisshin Oillio Group Co., Ltd.). Commercial products of tetra-2-ethylhexanoic acid pentaerythritol include, for example, trade name: Sarakos 5408 (manufactured by Nisshin Oillio Group Co., Ltd.) and trade name: PENTALAN-408 (manufactured by Nippon Surfactant Industries, Ltd.). . Commercial products of isononyl isononanoate include, for example, Sarakos 99 (trade name, manufactured by Nisshin Oillio Group Co., Ltd.).

  The content of the component B is not particularly limited, but from the viewpoint of imparting a smooth feeling without stickiness and exhibiting an excellent moisturizing effect, the content of 2.5 to 100% by mass in the emulsified composition for skin of the present invention. It is preferably 15.0% by mass, more preferably 5.0 to 10.0% by mass. The content of the component B is the total content of all the components B in the emulsion composition for skin of the present invention.

  In particular, the present invention, by using the component A and the component B in combination, imparts a smooth feel without stickiness while having a rich feeling of use, and can exhibit an excellent moisturizing effect. . Furthermore, there is no fear that the viscosity of the emulsion composition containing the higher alcohol is increased with time, and excellent storage stability (emulsion stability) can be imparted to the emulsion composition.

  The mass content ratio of the component A and the component B is not particularly limited, but from the viewpoint of exhibiting a markedly superior "feeling use feeling", "smooth non-sticky feel", and "moisturizing effect". It is preferable to prepare A: B at a ratio of 1: 2 to 1:10, and more preferably 1: 2.5 to 1: 6.5. If the ratio of the component A is too large, the spreadability on the skin is inferior and the skin tends to be hardly adapted. On the other hand, if the ratio of the component B is too large, a rich feeling of use tends to be hardly obtained.

[Component C]
Component C is a non-ionic surfactant. The emulsion composition for skin of the present invention contains a nonionic surfactant as an emulsifier.

  Examples of the component C include, but are not particularly limited to, sorbitan fatty acid esters, glycerin fatty acid esters, and alkylene oxide adducts thereof; castor oil or hydrogenated castor oil alkylene oxide adducts; polyglycerin fatty acid esters, glycol fatty acid esters, Polyoxyalkylene fatty acid ester (polyethylene glycol fatty acid ester), polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenol ether, polyoxyethylene sorbitol tetrafatty acid ester, polyoxyethylene alkyl phenyl formaldehyde condensate, polyoxyethylene sterol and its derivatives, poly Oxyethylene lanolin and its derivatives, polyoxyethylene beeswax derivatives, sugar esters and the like. That.

  In the present invention, among the above components C, from the viewpoint of imparting excellent storage stability (emulsion stability), sorbitan fatty acid esters, alkylene oxide adducts of sorbitan fatty acid esters, glycerin fatty acid esters, and alkylene oxides of glycerin fatty acid esters are preferred. It is preferable to use a nonionic surfactant selected from the group consisting of an adduct, a polyglycerin fatty acid ester, a glycol fatty acid ester, a polyoxyalkylene fatty acid ester, and a polyoxyalkylene alkyl ether, and these preferable nonionic surfactants are used. Among them, it is more preferable to use a solid or waxy nonionic surfactant at room temperature.

  Specific examples of the sorbitan fatty acid ester and the alkylene oxide adduct of the sorbitan fatty acid ester include sorbitan monopalmitate, sorbitan monostearate, sorbitan tristearate, sorbitan sesquistearate, polyoxyethylene sorbitan tristearate, and the like. Can be The number of moles of the alkylene oxide added is not particularly limited.

  Specific examples of the glycerin fatty acid ester and the alkylene oxide adduct of the glycerin fatty acid ester include glyceryl monostearate, polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl isostearate, and polyoxyethylene glyceryl tristearate. Can be The number of moles of the alkylene oxide added is not particularly limited.

  Specific examples of the polyglycerin fatty acid ester include polyglyceryl monostearate, polyglyceryl distearate, decaglyceryl tristearate, and the like.

  Specific examples of the glycol fatty acid ester include ethylene glycol monostearate, ethylene glycol distearate, and propylene glycol distearate.

  Specific examples of the polyoxyalkylene fatty acid ester include polyethylene glycol monolaurate, polyethylene glycol palmitate, polyethylene glycol monostearate, polyethylene glycol distearate, and the like. The number of moles of the alkylene oxide added is not particularly limited.

  Specific examples of the polyoxyalkylene alkyl ether include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene behenyl ether, polyoxyethylene isostearyl ether, polyoxyethylene octyl dodecyl ether, and the like. Is mentioned. The number of moles of the alkylene oxide added is not particularly limited.

  The content of Component C is not particularly limited, but from the viewpoint of imparting excellent storage stability (emulsion stability), from 1.0 to 3.0% by mass in 100% by mass of the emulsion composition for skin of the present invention. Is more preferable, and more preferably 1.5 to 2.5% by mass. The content of the component C is the total content of all the components C in the emulsion composition for skin of the present invention.

[Component D]
Component D is polyethylene glycol which is solid at room temperature. The emulsified composition for skin of the present invention can further enhance smooth feeling without stickiness by containing polyethylene glycol which is solid at room temperature. The component D is not particularly limited, and includes, for example, polyethylene glycol having a number average molecular weight (Mn) of 1000 or more.

  Specific examples of the component D include polyethylene glycol 1000, polyethylene glycol 1500, polyethylene glycol 1540, polyethylene glycol 2000, polyethylene glycol 4000, polyethylene glycol 6000, polyethylene glycol 11000, polyethylene glycol 20,000, and high polymerization having a number average molecular weight of 100,000 or more. Polyethylene glycol and the like.

  In the present invention, polyethylene glycol having a number-average molecular weight (Mn) of 1000 or more can be preferably used from the viewpoint of further enhancing the smooth feel without stickiness, and among them, from the viewpoint of spreadability on the skin, Polyethylene glycol having a molecular weight (Mn) of 1,000 to 20,000 is preferred.

  A commercially available product can be used as the component D. For example, trade name: PEG # 1000 (Mn: 1000, manufactured by NOF Corporation), trade name: PEG # 1500K (Mn: 1000, Lion Corporation) PEG # 1540 (Mn: 1540, manufactured by NOF Corporation), trade name: PEG # 2000 (Mn: 2000, manufactured by NOF Corporation), trade name: PEG # 4000 (Mn: 4000, manufactured by NOF Corporation) (Trade name: PEG # 6000 (Mn: 6000, manufactured by NOF Corporation), trade name: PEG # 11000 (Mn: 11,000, manufactured by NOF Corporation), trade name: PEG # 20000 (made by NOF Corporation) Mn: 20000, manufactured by NOF CORPORATION).

  The content of the component D is not particularly limited, but is preferably 0.3 to 2.5% by mass in 100% by mass of the emulsified composition for skin of the present invention from the viewpoint of further enhancing a smooth, non-sticky feel. More preferably, it is 0.5 to 2.0% by mass. The content of the component D is the total content of all the components D in the emulsion composition for skin of the present invention.

[Component E]
The emulsion composition for skin of the present invention preferably further contains a thickening polymer of component E from the viewpoint of enhancing the viscosity stability and emulsion stability of the preparation. Examples of the thickening polymer include water-soluble natural polymers, semi-synthetic polymers, and synthetic polymers.

  Specific examples of the component E include gum arabic, tragacanth gum, guar gum, locust bean gum, karaya gum, xanthan gum, iris moth, quince seed, gelatin, shellac, rosin, casein, and other natural polymers; sodium carboxymethyl cellulose, hydroxyethyl cellulose, Semi-synthetic polymers such as methylcellulose, ethylcellose, sodium alginate, ester gum, nitrocellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, crystalline cellulose, etc .; polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer Coalesce, synthetic polymers such as polyvinylmethylcellulose and polyamide resin.

  Among the above components E, it is preferable to use a natural polymer or a synthetic polymer from the viewpoint of imparting good viscosity stability and emulsion stability of the preparation, and xanthan gum, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer is preferable. Coalescence is more preferred. In the present invention, the component E is most preferably used in combination with the above-mentioned natural polymer and the above-mentioned synthetic polymer, from the viewpoint of imparting extremely good viscosity stability and emulsion stability of the preparation.

  When a carboxyvinyl polymer or an acrylic acid / alkyl methacrylate copolymer is used as the thickening polymer, it is usually used after neutralization with a basic substance. Examples of the basic substance include alkanolamines such as triethanolamine and monoethanolamine, ammonia, inorganic bases such as sodium hydroxide and potassium hydroxide, and basic amino acids such as arginine. The addition amount of the basic substance is an amount sufficient to neutralize the carboxyvinyl polymer or the acrylic acid / alkyl methacrylate copolymer, and may be appropriately added depending on the type and the amount of these components used. .

  In addition, a commercial item can be used as component E. Commercial products of xanthan gum include, for example, trade name: Echo Gum T (manufactured by Dainippon Sumitomo Pharma Co., Ltd.) and the like. Commercially available carboxyvinyl polymers include, for example, AQUPEC HV-805EG-300 (manufactured by Sumitomo Seika Co., Ltd.), and CARBOPOL 980 POLYMER (manufactured by Lubrizol Corporation). Examples of commercially available acrylic acid / alkyl methacrylate copolymers include trade names: PEMULEN TR-1, TR-2 (both manufactured by Lubrizol), trade names: CARBOPOL ETD2020 (manufactured by Noveon), and the like. Can be

  The content of the component E is not particularly limited, but is preferably 0.05 to 0.5% by mass in 100% by mass of the emulsion composition for skin of the present invention from the viewpoint of imparting good viscosity stability and emulsion stability of the preparation. % Is preferable, and more preferably 0.1 to 0.3% by mass. The content of the component E is the total content of all components E in the emulsion composition for skin of the present invention.

[Other ingredients]
Components (other components) other than the above-mentioned components A to E may be appropriately added to the emulsion composition for skin of the present invention according to the purpose. Other components are not particularly limited and include, for example, ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, 1,3-butylene glycol, glycerin, concentrated glycerin, diglycerin, triglycerin, glucose, maltose, and maltitol. , Sucrose, mannitol, sorbitol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, 1,2-decanediol and other polyhydric alcohols; higher alcohols; jojoba oil, lanolin, beeswax, etc. Waxes; hydrocarbons; silicones; triglycerides; cooling agents; whitening agents; humectants; ultraviolet absorbers; preservatives such as ethanol; antioxidants; pH adjusters; coloring agents; fragrances; Preservative; water and the like. In addition, what is contained in said components A-E shall be excluded from said other components.

  In addition, the content when the higher alcohol is contained in the emulsion composition for skin of the present invention is, from the viewpoint of suppressing the increase in viscosity over time of the preparation, in 100% by mass of the emulsion composition for skin of the present invention The content is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and further preferably substantially no content. In the present specification, "substantially does not contain" a higher alcohol means that the higher alcohol is not positively contained in the emulsion composition for skin of the present invention. Specifically, the content of the higher alcohol is less than 0.001% by mass, more preferably less than 0.0001% by mass, in 100% by mass of the emulsified composition for skin of the present invention. Is most preferred.

[Emulsion composition for skin]
Since the emulsion composition for skin of the present invention is excellent in storage stability (emulsion stability), it is not particularly limited as long as it is an emulsifier type, whether it is an emulsion, cream, or paste. Among these various dosage forms, the emulsion composition for skin of the present invention imparts a smooth feeling without stickiness while having a rich feeling of use, and exhibits an excellent moisturizing effect. It can be suitably used as a medium- and low-viscosity milky liquid dosage form. Furthermore, in the emulsified composition for skin of the present invention, storage stability (emulsion stability) and a much better feeling in use can be exhibited without containing a higher alcohol. There is no concern about deterioration of storage stability (emulsion stability) and feeling of use due to the viscosity increase over time which is peculiar to the emulsion composition.

  The viscosity (mPa · s) of the emulsified composition for skin of the present invention is not particularly limited as long as the desired effect is sufficiently exhibited, but the viscosity range at room temperature of the composition is 1,000 to 10,000 mPa · s. Is preferable, and more preferably 2000 to 9000 mPa · s. When the viscosity is 1000 mPa · s or more, excellent storage stability can be obtained and a rich feeling of use can be obtained. Further, by setting the viscosity to 10,000 mPa · s or less, the spreadability on the skin becomes good.

  The emulsion composition for skin of the present invention can be produced by mixing the above components in any order and emulsifying by a known method, for example, a phase inversion emulsification method using a homomixer. Mixing and emulsification may be performed separately or simultaneously.

  The site to which the emulsified composition for skin of the present invention is applied is not particularly limited, and includes, for example, a face (for example, forehead, eyes, eyes, cheeks, mouth, etc.), a body (arms, elbows, back of hands, fingertips, feet, Knees, heels, neck, sides, back, etc.). Among them, the face is particularly preferred. That is, the emulsified composition for skin of the present invention is preferably an emulsified composition for the face.

  Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to only these Examples. In addition, the compounding amount represents "% by mass" unless otherwise specified, and all amounts are converted into pure components. In addition, all evaluations were carried out under a constant temperature and humidity condition of 23 ° C. and a humidity of 60% RH.

(Sample preparation)
According to the compositions shown in Tables 1 and 2, emulsion compositions for skin of Examples and Comparative Examples were prepared and subjected to the following evaluation tests. The results are shown in Tables 1 and 2, respectively.

Details of each component described in Tables 1 and 2 are as follows.
Stearyl stearate: trade name “Amleps SS”, manufactured by Higher Alcohol Industry Co., Ltd. Cetyl myristate: trade name “Spam Aceti”, manufactured by NOF Corporation Pentaerythritol tetrastearate: trade name “UNISTER H-476”, NOF stock Glyceryl tri-2-ethylhexanoate: Exepearl TGO (trade name), Isononyl isononanoate (trade name: Sarakos 99), Nisshin Oilio Group Co., Ltd. Tetraisostearate pentaerythritol (trade name: Saracos) 5148V ", Nisshin Oilio Group Co., Ltd. Tetra 2-ethylhexanoate pentaerythritol: trade name" Salacos 5408 ", Nisshin Oillio Group Co., Ltd. polyethylene glycol 1000: trade name" PEG # 1000 ", NOF CORPORATION (Mn: 1000)
Polyethylene glycol 1540: trade name “PEG # 1540”, manufactured by NOF Corporation (Mn: 1540)
Polyethylene glycol 4000: trade name "PEG # 4000", manufactured by NOF Corporation (Mn: 4000)
Polyethylene glycol 20000: trade name "PEG # 20000", manufactured by NOF Corporation (Mn: 20000)
Acrylic acid / alkyl methacrylate copolymer: trade name "PEMULEN TR-1", carboxyvinyl polymer manufactured by Lubrizol Co .: trade name "CARBOPOL 980 POLYMER", trade name: Xanthan gum manufactured by Lubrizol Co .: trade name "Echo Gum T", Dainippon Japan Stearic acid manufactured by Sumitomo Pharmaceutical Co., Ltd .: trade name “EDENOR C18-98 MY”, concentrated glycerin manufactured by Emery Oleochemicals: trade name “cosmetic concentrated glycerin”, liquid paraffin manufactured by Sakamoto Pharmaceutical Co., Ltd .: trade name “CARNATION”, Sonneborn Potassium hydroxide: Co., Ltd .: Flake caustic potash; Toagosei Co., Ltd .: Stearyl alcohol: Calcol 8688, Kao Corporation: Ethanol: 95 ° general fermented alcohol, Takara Shu Made by Zo Corporation

(Test Example 1: Evaluation of storage stability)
The viscosity (25 ° C.) immediately after the preparation of each sample obtained in the examples and comparative examples was measured. Next, each sample was filled in a transparent glass container, and the viscosity of each sample was measured after being stored in a thermostat at 45 ° C. for 2 weeks. From the viscosity value after storage and the viscosity value immediately after preparation, the viscosity variation (%) of each sample was calculated as follows, and the storage stability was evaluated according to the following evaluation criteria.
The viscosity was measured using a TV-22 viscometer (manufactured by Toki Sangyo Co., Ltd.). The measurement was performed under the conditions of 4 rotors, 30 rpm and 1 min.

The viscosity variation rate was calculated by substituting the viscosity value (T ₀ ) of the sample immediately after preparation and the viscosity value (T ₁ ) of the sample after storage into the following equation.
[Viscosity variation (%)] = (T ₁ / T ₀ ) × 100
When the viscosity change rate of the sample is around 100, it can be said that there is no change in viscosity after storage and storage stability is excellent.

<Evaluation criteria for storage stability>
A: Viscosity variation (%) is 80% or more and less than 120% O: Viscosity variation (%) is 70% or more and less than 80%, or 120% or more and less than 130% Δ: Viscosity variation (%) Is 60% or more and less than 70%, or 130% or more and less than 140%. ×: Viscosity variation (%) is less than 60% or 140% or more.

(Test Example 2: Evaluation of feeling of use)
About 0.2 g of each sample obtained in the Examples and Comparative Examples was applied to the back of the hand, and the "richness" at the time of application, and the "touch" and "moisturizing feeling" of the applied portion 5 minutes after application were as follows. Sensory evaluation was performed according to the evaluation criteria, and the evaluation was performed according to the following evaluation criteria. The evaluation was conducted by 10 professional evaluators.

<Koku's rating criteria>
2 points: A rich feeling of use (a feeling of giving a high-density feel) can be sufficiently felt. 1 point: A rich feeling of use (a feeling of using a high-density feeling). Can be felt 0 point: No rich feeling of use (a feeling of use that gives a high-density feel) cannot be felt at all

<Scoring criteria>
2 points: Smooth feel without stickiness can be fully felt 1 point: Smooth feel without sticky can be felt 0 point: Smooth feel without stickiness cannot be felt at all

<Scoring criteria for moisturizing>
2 points: Moisturizing effect can be sufficiently felt 1 point: Moisturizing effect can be felt 0 point: Moisturizing effect cannot be felt at all

<Evaluation criteria>
◎: Average score is 1.5 points or more ：: Average score is 1.0 point or more and less than 1.5 points △: Average score is 0.5 points or more, 1.0 X: The average score is less than 0.5

  From the results in Tables 1 and 2, the skin emulsified compositions of the examples are excellent in storage stability (emulsion stability) and have a rich feeling of use, yet have a non-sticky and smooth touch. And an emulsion composition for skin having an excellent moisturizing effect. On the other hand, it can be seen that the emulsion compositions for skin of Comparative Examples not satisfying the constitution of the present invention cannot sufficiently exhibit the effects of the present invention.

Further, the formulation examples of the emulsion composition for skin of the present invention are shown below.
(Prescription example 1: emulsion)
Stearyl stearate 2.0% by mass
Glyceryl tri-2-ethylhexanoate 3.0% by mass
3.0 mass% of isononyl isononanoate
Pentaerythritol tetraisostearate 2.0% by mass
Liquid paraffin 1.0% by mass
Polyethylene glycol monostearate 1.5% by mass
Sorbitan monostearate 1.0% by mass
Polyethylene glycol 1000 0.5% by mass
0.5% by mass of polyethylene glycol 1540
Acrylic acid / alkyl methacrylate copolymer 0.2% by mass
Kitansan gum 0.03% by mass
Stearic acid 0.5% by mass
5.0% by mass of concentrated glycerin
Potassium hydroxide 0.1% by mass
EDTA-2Na 0.02 mass%
Dipotassium glycyrrhizinate 0.1% by mass
5.0% by mass of ethanol
Perfume 0.03% by mass
Purified water balance

(Prescription example 2: emulsion)
Stearyl stearate 1.0% by mass
Cetyl myristate 1.0% by mass
Pentaerythrit tetra-2-ethylhexanoate 2.0% by mass
Glyceryl tri-2-ethylhexanoate 2.0% by mass
1.0 mass% isononyl isononanoate
Liquid paraffin 2.0% by mass
Sorbitan monostearate 0.5% by mass
1.6% by mass of polyoxyethylene (20) stearyl ether
Polyethylene glycol 1000 0.5% by mass
Polyethylene glycol 2000 0.5% by mass
Carboxyvinyl polymer 0.2% by mass
Kitansan gum 0.03% by mass
Stearic acid 0.5% by mass
Concentrated glycerin 10.0% by mass
Potassium hydroxide 0.1% by mass
EDTA-2Na 0.02 mass%
Methyl paraben 0.2% by mass
Phenoxyethanol 0.5% by mass
2.0% by mass of ethanol
Perfume 0.03% by mass
Purified water balance

Claims (6)

An emulsion composition for skin, comprising the following component A, component B, component C, and component D ,
An emulsion composition for skin, wherein the mass content ratio of the component A and the component B is A: B = 1: 2 to 1:10 .
Component A: at least one ester oil of a straight-chain fatty acid and a straight-chain higher alcohol and an ester oil of a straight-chain fatty acid and pentaerythritol, which is a solid fatty acid ester oil at room temperature. Component B: liquid at room temperature. Fatty acid ester oil having a branched chain structure Component C: Nonionic surfactant Component D: Polyethylene glycol solid at room temperature   The emulsion composition for skin according to claim 1, wherein the component A is an ester oil of a linear fatty acid and a linear higher alcohol.   The emulsion composition for skin according to claim 1 or 2, wherein the component B is an ester oil of a branched fatty acid and a polyhydric alcohol and / or an ester oil of a branched fatty acid and a branched higher alcohol. The content of the component A is 1.5 to 2.5% by mass in 100% by mass of the emulsion composition for skin, and the content of the component B is 100% by mass in the emulsion composition for skin. The emulsion composition for skin according to any one of claims 1 to 3, which is 5 to 15.0% by mass . The emulsion composition for skin according to any one of claims 1 to 4, further comprising the following component E.
Component E: thickening polymer   The emulsion composition for skin according to any one of claims 1 to 5, which does not contain a higher alcohol or contains a higher alcohol and has a content of the higher alcohol of 0.5% by mass or less.