JP5825768B2 - Oil-in-water emulsified cosmetic - Google Patents

Description

  The present invention relates to an oil-in-water emulsified cosmetic, and specifically relates to an oil-in-water emulsified cosmetic that contains an electrolyte component and can also be prepared as a translucent cosmetic.

  Conventionally, oil-in-water emulsified cosmetics are widely used in basic cosmetics, hair cosmetics, makeup cosmetics, and the like because of their low elongation at the time of application and good compatibility with the skin. Among oil-in-water emulsified cosmetics, those having a translucent appearance have a beautiful appearance and a high-class feeling, and are in high demand in the market.

  In an oil-in-water emulsified cosmetic, various emulsifiers are used to emulsify oil droplets. For example, it has been proposed that phospholipids are blended in a translucent emulsified cosmetic (for example, Patent Documents 1 to 11). However, some emulsifiers such as phospholipids have poor stability over time in the presence of an electrolyte, and some oil-in-water emulsified cosmetics containing a large amount of electrolyte cannot be stably blended. Many medicinal components such as whitening agents and moisturizers are electrolytes, and it is a major limitation that they cannot be used together.

Japanese Unexamined Patent Publication No. 63-264512 JP-A-1-176443 JP 2001-302433 A JP 2006-290841 A JP 2007-291035 A JP 2007-254404 A JP 2007-254405 A JP 2008-74780 A JP 2008-297273 A JP 2009-107932 A JP 2010-6739 A

An object of the present invention is to improve the emulsification stability of an oil-in-water emulsified cosmetic containing an electrolyte.
More specifically, the present invention provides an oil-in-water emulsified cosmetic containing an electrolyte that can be prepared as a translucent cosmetic having excellent usability (non-stickiness) and emulsion stability. Let it be an issue.

As a result of various studies by the present inventors to solve the above-mentioned problems, a combination of a predetermined surfactant and a predetermined surfactant aid can be prepared as a translucent cosmetic material even under the condition of an electrolyte. The knowledge that an oil-type emulsified cosmetic can be provided was obtained, and further studies were made based on this knowledge, and the present invention was completed. That is, the means for solving the above problems are as follows:
The following components (A) to (E);
(A) One or two or more types selected from polyoxyethylene sorbite fatty acid esters of HLB 10 to 15 (B) One or more types selected from polyoxyethylene hydrogenated castor oil of HLB 10 to 15 (C) 12 carbon atoms It contains one or two or more (D) water (E) electrolytes selected from -22 higher alcohols and / or fatty acid monoglyceryl having 12 to 22 carbon atoms, and the average particle size of the emulsified droplets is 50 to 300 nm. It is an oil-in-water emulsified cosmetic.

According to the present invention, the emulsification stability of an oil-in-water emulsified cosmetic containing an electrolyte can be improved.
More specifically, according to the present invention, there is provided an oil-in-water emulsified cosmetic containing an electrolyte that can be prepared as a translucent cosmetic having excellent usability (non-stickiness) and emulsion stability. be able to.

Hereinafter, the present invention will be described in detail. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
The present invention relates to components (A) to (E);
(A) One or two or more types selected from polyoxyethylene sorbite fatty acid esters of HLB 10 to 15 (B) One or more types selected from polyoxyethylene hydrogenated castor oil of HLB 10 to 15 (C) 12 carbon atoms The invention relates to an oil-in-water emulsified cosmetic containing one or two or more (D) water (E) electrolytes selected from ˜22 higher alcohols and / or fatty acid monoglyceryl having 12 to 22 carbon atoms. Hereinafter, each component will be described in detail.

Component (A):
The oil-in-water emulsified cosmetic of the present invention contains one or more selected from component (A) HLB 10-15 polyoxyethylene sorbite fatty acid ester. Component (A) contributes to the improvement of the emulsion stability of the oil-in-water emulsion cosmetic of the present invention. Specifically, any of sorbitol added with ethylene oxide and esterified with a fatty acid can be used as long as the HLB is in the above range. Of these, tetraoleic acid polyoxyethylene sorbite, which is obtained by esterifying ethylene oxide to sorbitol mainly with oleic acid, is preferable because of its high effect of improving emulsion stability. Examples of commercially available products include NIKKOL GO-430NV, 440V, and 460V (manufactured by Nikko Chemicals). If necessary, one or more of them can be used.

Ingredient (B):
The oil-in-water emulsified cosmetic of the present invention contains one or more selected from polyoxyethylene hydrogenated castor oil of component (B) HLB 10-15. A component (B) contributes to the improvement of the emulsion stability of the oil-in-water type emulsion cosmetic of this invention with a component (A). Specifically, any one can be used as long as it is obtained by adding ethylene oxide to hydrogenated castor oil obtained by hydrogenation of castor oil and the HLB is in the above range. Among them, ethylene oxide added mainly to hydrogenated castor oil is preferably 20 to 80 mol, more preferably 40 to 60 mol, because the effect of improving the emulsion stability is high. As a commercial item, NIKKOL HCO-20, 30, 40, 50, 60, 70, 80 (above, Nikko Chemicals make) etc. are mentioned. If necessary, one or more of them can be used.

Component (C):
The oil-in-water emulsified cosmetic of the present invention contains one or more selected from component (C) a higher alcohol having 12 to 22 carbon atoms and / or a fatty acid monoglyceryl having 12 to 22 carbon atoms. Component (C) is a surfactant, and together with components (A) and (B) which are surfactants, contributes to the improvement of the emulsion stability of oil-in-water emulsion cosmetics, and feels of use (stickiness) Also contributes to the improvement of
The higher alcohol having 12 to 22 carbon atoms may be a saturated higher alcohol containing no unsaturated bond or an unsaturated higher alcohol containing an unsaturated bond. Examples of higher alcohols having 12 to 22 carbon atoms include lauryl alcohol (C ₁₂ ), myristyl alcohol (C ₁₄ ), cetyl alcohol (C ₁₆ ), stearyl alcohol (C ₁₈ ), oleyl alcohol (C ₁₈ , unsaturated). ), Linoleyl alcohol (C ₁₈ , including unsaturated bonds) and behenyl alcohol (C ₂₂ ). Also, cetostearyl alcohol (a mixture of cetanol and stearyl alcohol), which is a mixture of two kinds of alcohols, can be used.
The fatty acid monoglyceryl having 12 to 22 carbon atoms refers to a compound in which one hydroxyl group of glycerin is ester-bonded with a fatty acid having 12 to 22 carbon atoms. Examples of the fatty acid having 12 to 22 carbon atoms include myristic acid, palmitic acid, stearic acid, alginic acid, and behenic acid.
Among them, as higher alcohols having 12 to 22 carbon atoms, behenyl alcohol (C ₂₂ ), which is a higher alcohol having 22 carbon atoms, and cetostearyl alcohol (a mixture of cetanol and stearyl alcohol), which is a mixture of two alcohols, As the fatty acid monoglyceryl having 12 to 22 carbon atoms, glyceryl stearate is preferable because it has a high effect of improving the emulsion stability. Examples of commercially available products include Conol 2265 (manufactured by Shin Nippon Rika Co., Ltd.), cetanol (manufactured by Higher Alcohol), Poem V-100 (manufactured by Riken Vitamin).

Component (D):
The oil-in-water emulsified cosmetic of the present invention contains component (D) water. Water is an essential component for constituting an oil-in-water emulsified cosmetic. If it is the water generally used for cosmetics, there will be no restriction | limiting in particular. The water used in the present invention may be purified water, hot spring water, deep water, plant steam distilled water, or the like. A component (D) can be used 1 type, or 2 or more types as needed.

Ingredient (E):
The oil-in-water emulsified cosmetic of the present invention contains one or more of component (E) electrolytes. In the oil-in-water emulsion cosmetic of the present invention, the electrolyte may be blended for any purpose. One aspect of the electrolyte is a cosmetic ingredient that is dermatologically effective on the skin. Cosmetic ingredients that are dermatologically effective on the skin include moisturizers, anti-inflammatory agents, whitening agents, UV protection agents, and the like, and electrolytes that act as these agents can be used. Specifically, examples of moisturizers include lactates such as amino acids and sodium lactate, pyrrolidone carboxylates such as sodium pyrrolidonecarboxylate and urea; examples of anti-inflammatory agents include glycyrrhizinate such as dipotassium glycyrrhizinate; Examples of the agent include ascorbic acid derivatives such as L-ascorbic acid-2-phosphate sodium, L-ascorbic acid-2-magnesium phosphate, ascorbic acid glucoside; UV sorbents as phenyl benzimidazole sulfonate, And hydroxymethoxybenzophenone sulfonate.

Ratio of components (A) to (E):
In the oil-in-water emulsified cosmetic of the present invention, the HLB value of the surfactant as a whole can be changed by variously changing the proportions of the components (A) to (C). Even if it mix | blends, it will become an oil-in-water type emulsified cosmetics excellent in emulsification stability. Therefore, the preferable range of the ratio of components (A) to (C) varies depending on the properties of the oil component used together. Generally, it is as follows, but is not limited to the following ranges.
The content a of the component (A) is, for example, preferably 0.1 to 5% by mass (hereinafter simply indicated by “%”), and more preferably 1 to 2%.
The content b of the component (B) is, for example, preferably 0.1 to 5% by mass, and more preferably 1 to 2%.
For example, the content c of the component (C) is preferably 0.01 to 5% by mass, and more preferably 1 to 3%.

  From the viewpoint of emulsion stability, it is preferable that the content c of the component (C) and the content a of the component (A) satisfy c ≦ a, and the content c of the component (C) and the component The content b of (B) preferably satisfies c ≦ b, and more preferably satisfies c ≦ a and c ≦ b.

  The content of component (D) is not particularly limited. The oil-in-water emulsified cosmetic dosage form can be varied within a range that can be maintained. Depending on the amount of water added, the oil-in-water emulsified cosmetic of the present invention can be prepared as a transparent, translucent and cloudy cosmetic, respectively. The higher the water content, the higher the transparency of the oil-in-water emulsified cosmetic, and in order to prepare it as a translucent cosmetic, the water content is generally 50% to 90%. And preferably 60% to 85%.

The preferable range of content of a component (E) can be shown with the electrical conductivity of an oil-in-water type emulsion cosmetic. Specifically, it is preferably blended in such an amount that the electrical conductivity at a temperature of 25 ° C. is 0.01 to 4.3 S / m, more preferably 0.1 to 2 S / m.
In addition, electrical conductivity can be measured using common electrical conductivity meters, such as the electrical conductivity meter CM-60G by Toa Denpa Kogyo Co., Ltd., for example.

Other ingredients:
The oil-in-water emulsified cosmetic of the present invention may contain components other than the above components (A) to (E). For example, phospholipids, oily components as feel adjustment and emollient components, powder components as feel adjustment and coloring, fibers, surfactants other than components (A) to (C) as powder dispersion and feel adjustment, moisturizing The effects of the present invention are impaired by aqueous components, UV absorbers, alcohols, moisturizers, anti-fading agents, antioxidants, antifoaming agents, cosmetic ingredients, preservatives, fragrances, and refreshing agents as powder dispersants. It can mix | blend suitably in the range which is not. Below, the component which can be mix | blended arbitrarily is demonstrated.
(F) Phospholipid The oil-in-water emulsion cosmetic of the present invention may contain a component (F) phospholipid. Phospholipids are added for various purposes such as emulsifiers, emulsification aids, and humectants. The phospholipid that can be used in the present invention may be derived from animals or plants, or may be synthesized and semi-synthesized. The composition of phospholipids derived from animals and plants contains phosphatidylcholine (PC) as a main component, and additionally contains phosphatidylinositol (PI) and phosphatidylethanolamine (PE). Further, it may contain phosphatidic acid, phosphatidylserine, phosphatidylglycerol, sphingmyelin, lysophosphatidylcholine, and the like. In the present invention, by using the components (A) to (C), any phospholipid composition can be stably blended in the presence of an electrolyte. Therefore, phospholipids having various compositions can be used depending on the application. For example, since PC is excellent in emulsifying power, a phospholipid having a high PC ratio is suitable for blending as an emulsifier. Moreover, since the phospholipid with a high ratio of PI and PE is excellent in moisturizing property, it is suitable for blending as a moisturizing agent or an agent having both a moisturizing agent and an emulsifier.

An example of the (F) phospholipid that can be used in the present invention is a phospholipid having a phosphatidylinositol (PI) content of 20% by mass or more and a phosphatidylethanolamine (PE) content of 30% by mass or more. This phospholipid is blended as an emulsifier and / or emulsification aid, and also contributes to improvement of moisture retention. In the phospholipid, PI is preferably 20 to 35% by mass, and PE is more preferably 30 to 40% by mass. From the viewpoint of moisture retention, the proportion of PC is preferably low. Specifically, it is preferably 25% by mass or less, and more preferably 10 to 25% by mass.
Commercially available phospholipids may be used. For example, NIKKOL Resinol S-PIE, NIKKOL Resinol S-10, NIKKOL Resinol S-10E, NIKKOL Resinol S-10EX (all manufactured by Nikko Chemicals) may be used. it can.

  As the phospholipid content increases, the moisture retention of the oil-in-water emulsified cosmetic of the present invention increases, but on the other hand, the emulsion stability tends to decrease. In order to provide an oil-in-water emulsified cosmetic that exhibits high moisture retention and high emulsification stability, the phospholipid content is preferably 0.001 to 1%.

-Oily component The oil-in-water emulsified cosmetic of the present invention may contain an oily component. Any oil of animal origin, vegetable oil, synthetic oil, etc. commonly used in cosmetics may be used, and any oil such as solid oil, semi-solid oil, liquid oil, volatile oil, etc. may be used. be able to. Specifically, hydrocarbons, fats and oils, waxes, hardened oils, ester oils, fatty acids, higher alcohols, silicone oils, fluorine-based oils, lanolin derivatives, oily gelling agents, etc. Can be mentioned. When liquid oil is used, excessive heating is not required at the time of blending. Therefore, the odor change due to heating (for example, in a mode in which phospholipid is blended) Since it can reduce, it is preferable.

  Examples of oily components that can be used include hydrocarbons such as liquid paraffin, squalane, vegetable squalane, petroleum jelly, polyisobutylene and polybutene, oils and fats such as olive oil, castor oil, mink oil and macadamian nut oil, jojoba oil , Diisostearyl malate, N-lauroyl-L-glutamate di (cholesteryl, behenyl, octyldodecyl), glyceryl trioctanoate, polyglyceryl diisostearate, diglyceryl triisostearate, cetyl 2-ethylhexanoate, isopropyl myristate, palmitic Isopropyl acid, octyldodecyl myristate, tridecyl trimellitate, trimethylolpropane trioctanoate, dimer linoleic acid (phytosteryl, isostearyl, cetyl, stearyl, behenyl), meadow Foam oil, hydrogenated pentaerythrityl rosinate, hydrogenated glyceryl abietic acid, neopentyl glycol dioctanoate, neopentyl glycol dioctanoate, cholesterol fatty acid ester, phytosterol fatty acid ester, triglyceride, stearic acid, lauric acid, myristic Low molecular chains such as acids, fatty acids such as isostearic acid and oleic acid, saturated hydrocarbon oil having a side chain with a boiling point of 260 ° C. or less at normal pressure, hexamethyldisiloxane, decamethyltetrasiloxane, dodecamethylcyclopentasiloxane Volatile oils such as low molecular weight cyclic silicone oils such as low molecular weight polysiloxane, low polymerization degree dimethylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dimethylpolysiloxane Methylphenyl polysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, trimethylsiloxysilicic acid, high polymerization degree methylphenyl polysiloxane, cross-linked methyl polysiloxane, polyoxyalkyl-modified organopolysiloxane, cross-linked polyether-modified methyl Polysiloxane, methacrylic-modified polysiloxane, stearyl-modified methylpolysiloxane, oleyl-modified methylpolysiloxane, behenyl-modified methylpolysiloxane, polyvinylpyrrolidone-modified methylpolysiloxane, high polymerization dimethylpolysiloxane, polyoxyalkylene, alkylmethylpolysiloxane, methyl Polysiloxane copolymers, alkoxy-modified polysiloxanes, cross-linked organopolysiloxanes, fluorine-modified polysiloxanes, etc. Fluorine oils such as ricones, perfluorodecane, perfluorooctane, perfluoropolyether, lanolin, lanolin acetate, lanolin fatty acid isopropyl, lanolin derivatives such as lanolin alcohol, dextrin fatty acid ester, sucrose fatty acid ester, aluminum isostearate , Oily gelling agents such as potassium stearate and 12-hydroxystearic acid, and the like, and one or more of them can be used.

  Although there is no restriction | limiting in particular about content of the oil-based component in the oil-in-water type emulsion cosmetics of this invention, Generally, it is preferable that it is 0.01 to 20%, and it is 0.1 to 5%. Is more preferable.

-Powder component The oil-in-water emulsified cosmetic of the present invention may contain a powder component. As a powder component, as long as it is a powder generally used in cosmetics, spherical, plate-like, needle-like shapes, fumes, fine particles, pigment grades, etc., porous, non-porous, etc. It is not particularly limited by the particle structure and the like, and any of inorganic powders, glitter powders, organic powders, pigment powders, metal powders, composite powders, and the like can be used. Specifically, white inorganic pigments such as titanium oxide, zinc oxide, cerium oxide, barium sulfate, iron oxide, carbon black, titanium / titanium oxide sintered product, chromium oxide, chromium hydroxide, bitumen, ultramarine blue, etc. Colored inorganic pigments, talc, muscovite, phlogopite, saucite, biotite, synthetic mica, sericite (sericite), synthetic sericite, kaolin, silicon carbide, bentonite, smectite, silicic anhydride, aluminum oxide, magnesium oxide , Zirconium oxide, antimony oxide, siliceous earth, aluminum silicate, magnesium magnesium silicate, calcium silicate, barium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, hydroxyapatite, boron nitride, etc., borosilicate Calcium aluminum oxide, titanium dioxide coated mica, Titanium oxide coated glass powder, titanium dioxide coated bismuth oxychloride, iron oxide coated mica, iron oxide coated mica titanium, iron oxide coated glass powder, bituminized mica titanium, carmine treated mica titanium, bismuth oxychloride, fish scale foil, polyethylene terephthalate Bright powder such as aluminum / epoxy laminate powder, polyethylene terephthalate / polyolefin laminate film powder, polyethylene terephthalate / polymethyl methacrylate laminate film powder, polyamide resin, polyethylene resin, polyacrylic resin, polyester resin, fluorine resin , Cellulose resin, polystyrene resin, copolymer resin such as styrene-acrylic copolymer resin, polypropylene polymer, organic polymer resin powder such as silicone resin, urethane resin, zinc stearate, N-A Organic low molecular weight powder such as luridine, natural organic powder such as silk powder, cellulose powder, red 201, red 202, red 205, red 226, red 228, orange 203, orange 204, Organic pigment powders such as blue No. 404 and yellow No. 401, red No. 3, red No. 104, red No. 106, orange No. 205, yellow No. 4, yellow No. 5, green No. 3, blue No. 1, etc. zirconium, barium Or organic pigment powder such as aluminum lake or metal powder such as aluminum powder, gold powder, silver powder, fine titanium oxide coated mica titanium, fine zinc oxide coated mica titanium, barium sulfate coated mica titanium, titanium oxide containing silicon dioxide, oxidation Composite powders such as zinc-containing silicon dioxide, and the like. These powders can be used singly or in combination of two or more of them. Also good.

・ Fibers Examples of usable fibers include synthetic fibers such as nylon, polypropylene, and polyester, artificial fibers such as rayon, natural fibers such as cellulose, and semisynthetic fibers such as acetate silk, and these are particularly limited. It is not a thing but 1 type (s) or 2 or more types can be used as needed. These fibers may be used as a composite fiber in which polyethylene terephthalate and nylon are laminated in layers, or one or two or more composite fibers may be used. Those treated with an oil agent, a silicone oil, a fluorine compound, a surfactant or the like can also be used.

Other surfactants In the present invention, the surfactant that is the main component of emulsification is component (A) and component (B), and the surfactant is component (C). In addition to these, when a powder is blended, the dispersibility can be improved, and another surfactant can be blended as an emulsion stabilizer. Other surfactants can be used as long as they are commonly used in cosmetics, but nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, etc. Can be mentioned. For example, glycerin fatty acid ester and its alkylene glycol adduct, polyglycerin fatty acid ester and its alkylene glycol adduct, sorbitan fatty acid ester and its alkylene glycol adduct, sucrose fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyalkylene alkyl Examples thereof include modified organopolysiloxane and polyether-modified organopolysiloxane.

-Film-forming component As the film-forming component that can be used, any of emulsion polymers, water-soluble resins, oil-soluble resins and the like can be used. Examples of the film-forming emulsion polymer include a polyacrylic acid emulsion, an alkyl methacrylate copolymer emulsion, an alkyl acrylate / styrene copolymer emulsion, a polyvinyl acetate emulsion, and a silicone-containing polymer emulsion. Examples of the water-soluble resin include polyvinyl alcohol, polyvinyl pyrrolidone, vinyl pyrrolidone / vinyl acetate copolymer, hydroxyethyl cellulose, vinyl pyrrolidone / styrene copolymer, sodium polyacrylate, and the like. Examples of the oil-soluble resin include rosin acid-based resins such as rosin acid pentaerythritol, trimethylsiloxysilicic acid, acrylic-modified silicone, polyvinyl isobutyl ether, polyisobutylene, and the like.

-Aqueous component The aqueous component that can be used is any component that is soluble in water. For example, lower alcohols such as ethyl alcohol and butyl alcohol, propylene glycol, 1,3-butylene glycol, 1,2- Examples include glycols such as pentanediol, dipropylene glycol, and polyethylene glycol; glycerols such as glycerin, diglycerin, and polyglycerin; and plant extracts such as aloe vera, witch hazel, hamamelis, cucumber, lemon, lavender, and rose. Examples of water-soluble polymers include guar gum, sodium chondroitin sulfate, sodium hyaluronate, gum arabic, sodium alginate, carrageenan and other semi-synthetic polymers such as methyl cellulose and carboxymethyl cellulose, carboxyvinyl polymer, alkyl-added carboxy. Synthetic materials such as vinyl polymers can be mentioned. Other moisturizing agents such as protein, mucopolysaccharide, collagen, elastin, keratin and the like can also be contained.
Examples of the ultraviolet absorber include benzophenone, p-aminobenzoic acid, cinnamic acid, salicylic acid, 4-tert-butyl-4′-methoxydibenzoylmethane, oxybenzone, and the like.

Antioxidants Examples of usable antioxidants include α-tocopherol and ascorbic acid, cosmetic ingredients such as vitamins, anti-inflammatory agents and herbal medicines, and antiseptics such as paraoxybenzoic acid esters, phenoxyethanol, 1 , 3-butylene glycol, 1,2-pentanediol, and the like.

Method for producing oil-in-water emulsified cosmetic of the present invention:
Although the manufacturing method of the oil-in-water type emulsion cosmetics of this invention is not specifically limited, An example is as follows.
Ingredients (A) to (C) and an oily component added as required are mixed uniformly. If desired, it may be heated. The heating is preferably about 65 to 75 ° C.
Next, a part of the component (D) is added to the mixture and emulsified. In this case, heating may be performed as desired. The heating is preferably about 65 to 75 ° C. The amount of component (D) used for emulsification in this step is preferably about 5 to 60 times the mass of the total mass of components (A) to (C).
The remainder of the component (D) and the component (E), and an aqueous component, a film-forming component and an antioxidant which are optionally added are further mixed into the emulsion.

  Usually, amphiphiles such as higher alcohols and surfactants form a state called α-gel in the aqueous phase, which is used to increase the interfacial area by finely emulsifying droplets using a high-pressure shear emulsifier, etc. Conventionally, stabilization of a fine emulsion has been achieved by orienting an amphiphile and a surfactant at the oil-water interface. However, the combination of the components (A) and (B) that are surfactants and the component (C) higher alcohol that is a surfactant aid, which is utilized in the present invention, is more efficiently oriented to the interface. Even if the interface area of the emulsified droplets is not strictly controlled, it is considered that a liquid and stable fine emulsion is formed. For this reason, the high-pressure shearing emulsifier conventionally required when preparing a fine emulsion is not necessary, and the oil-in-water emulsified cosmetic of the present invention can be produced with a stirrer having a weak shearing force, such as a paddle mixer. it can.

Properties of the oil-in-water emulsified cosmetic of the present invention:
-Emulsified droplets The average particle diameter of the emulsified droplets contained in the oil-in-water emulsified cosmetic of the present invention is 50 to 300 nm, preferably 60 to 150 nm.
When the average particle size of the emulsified droplets is within the above range, the emulsion stability and the feeling of use are good. In addition, an oil-in-water emulsified cosmetic that can be prepared as a translucent cosmetic, is excellent in aesthetics, and has a high-class feeling can be provided. Moreover, as described above, in the present invention, an oil-in-water emulsified cosmetic composed of the fine emulsified droplets can be prepared without using a machine having a strong shearing force such as a high-pressure shear emulsifier.
The average particle diameter of the emulsified droplets can be measured using a particle size distribution measuring apparatus (for example, manufactured by Submicron Particle Analyzer N5 BECKMAN COULTER) using a laser diffraction / scattering method.

Transmittance One aspect of the oil-in-water emulsified cosmetic of the present invention is a translucent cosmetic. In this specification, “semi-transparent” means that the transmittance of light having a wavelength of 700 nm in a 1 cm square quartz cell is in the range of 5% to 95%. Preferably it is 30 to 80%.
For the measurement of the transmittance, for example, a general spectrophotometer such as “UV-2500PC UV-VIS REDORDING SPECTROPHOMETER” manufactured by SHIMADZU can be used.

  As the dosage form of the oil-in-water emulsified cosmetic of the present invention, it can be carried out in various dosage forms such as liquid, gel, paste, cream, solid and the like, lotion, emulsion, cosmetic liquid, Basic cosmetics such as creams and eye creams, hair cosmetics such as hair creams and hair waxes, lipsticks, concealers, foundations, blushers, sunscreen cosmetics, eye shadows, mascaras, eyeliner makeup cosmetics Can do. Among these, the effect can be fully utilized in the external preparation for skin, and further, it is preferably used in basic cosmetics, and particularly preferably used in skin lotions, emulsions, cosmetics, creams, eye creams, and the effects of the invention. It can be used sufficiently. The appearance may be either translucent or opaque (white turbidity). The dosage form is preferably liquid, and the viscosity value measured by a B-type rotational viscometer at 30 ° C. is preferably 10,000 mPa · s or less.

EXAMPLES Next, although an Example is given and this invention is demonstrated still in detail, this invention is not limited at all by these.
Examples 1 to 15 and Comparative Examples 1 to 11: Oil-in-water emulsified cosmetics Oil-in-water emulsified cosmetics having the compositions shown in the following table were prepared by the following methods.
The average particle diameter of the emulsified droplets of each sample was measured and evaluated according to the following criteria. Moreover, the electrical conduction of each sample was measured on condition of the following. Furthermore, the sustainability of the moisturizing feeling, the feeling of use (no stickiness), and the emulsion stability of each sample were evaluated according to the following criteria. These results are also shown in the following table.

(Manufacturing method)
A. Ingredients (1) to (15) are heated to about 70 ° C. and mixed uniformly.
B. (16) to (17) heated to about 70 ° C. are added to A, emulsified and then cooled.
C. (18) to (28) are mixed with B.
D. C was filled into a container to obtain an oil-in-water emulsified cosmetic.

(Evaluation methods and standards)
a. Average particle diameter The average particle diameter of the emulsified droplets of each sample was measured with a particle size distribution measuring apparatus (submicron particle analyzer N5 BECKMAN COULTER) by a laser diffraction / scattering method, and evaluated according to the following criteria.
Evaluation criteria (Criteria): (Criteria)
◎: Average particle size is 60 nm or more and 150 nm or less ○: Average particle size is 50 nm or more and less than 60 nm, more than 150 nm and less than 300 nm △: Average particle size is less than 50 nm, more than 300 nm and less than 350 nm ×: Average particle size is more than 350 nm

b. Electric conductivity The electric conductivity at a temperature of 25 ° C. was measured with an electric conductivity meter CM-60G manufactured by Toa Radio Industry.

c. Persistence of moisturizing sensation Regarding the persistence of the moisturizing sensation of c, each sample was applied to the skin, and 20 normal cosmetic evaluation panels with a cosmetic history of 10 years or more had a normal life. Was evaluated for sustainability. Five levels were evaluated according to the following evaluation criteria, and a score was assigned. The average value was calculated from the total score of all the panels for each sample, and the determination was made according to the following four-level criteria.
(Evaluation criteria)
Evaluation result: Score Very high moisturizing feeling: High five-point moisturizing feeling: Four points Normal: Low three-point moisturizing feeling: Two points Very low moisturizing feeling: One point Judgment criteria:
Average score: 4.5 or higher rating: ◎
3.5 or more and less than 4.5: ○
1.5 or more and less than 3.5: △
Less than 1.5: ×

d. Feeling of use (no stickiness)
As for the non-stickiness at the time of use of d, each sample was applied to the skin by 20 panelists specializing in cosmetics with a cosmetic history of 10 years or more for each sample. Graded and graded, the average value was calculated from the total score of all the panels for each sample, and judged according to the following 4 grade criteria.
(Evaluation criteria)
Evaluation result: Score very good: 5 points good: 4 points normal: 3 points slightly bad: 2 points bad: 1 point Judgment criteria:
Average score: 4.5 or higher rating: ◎
3.5 or more and less than 4.5: ○
1.5 or more and less than 3.5: △
Less than 1.5: ×

e. Emulsification stability Regarding the stability over time of e, the oil-in-water type emulsion cosmetics of the above examples and comparative examples are put in a thermostatic bath at 40 ° C., and the appearance after one month is observed with the naked eye, and the following criteria are determined: Judged by.
(Time stability criteria)
Judgment: Evaluation ◎: Not creamed at all ○: Very slightly creamed △: Very creamed ×: Extremely creamed

  Moreover, about the oil-in-water type emulsified cosmetics of Examples 1-15, when the transmittance | permeability of wavelength 700nm was measured using "UV-2500PC UV-VIS REDCORDING SPECTROPHOMETER" by SHIMADZU company, all the transmittance | permeability is 30- 80%, ie prepared as a translucent cosmetic.

From the results shown in the above table, it can be understood that any of the oil-in-water emulsified cosmetics of Examples 1 to 15 of the present invention had good evaluation results for moisture retention, feeling of use, and emulsion stability. Examples 1 to 15 are translucent cosmetics that have a high aesthetic appearance and can be provided as high-grade cosmetics.
On the other hand, since Comparative Examples 1 to 11 do not contain at least one of components (A) to (C) and (E), one or more evaluation items are remarkably inferior as compared to Examples. I can understand that it was. Specifically, both or at least one of the components (A) and (B) is not blended, or instead of the components (A) and (B), a polyoxyethylene sorbite fatty acid ester having an HLB of less than 10 and an HLB In Comparative Examples 1 to 9, in which polyoxyethylene hydrogenated castor oil having a viscosity of less than 10 was blended, the average particle size of the emulsified droplets was not in the desired range, and it could not be prepared as a translucent cosmetic. It can be understood that the stability was also significantly inferior.
It can be understood that Comparative Example 10 in which the component (C) is not blended is sticky, inferior in feeling of use, and has low emulsion stability.
It can be understood that Comparative Example 11 in which component (E) is not blended is inferior in sustainability of the moisturizing feeling.

Claims (9)

The following components (A) to (E);
(A) One or two or more types selected from polyoxyethylene sorbite fatty acid esters of HLB 10 to 15 (B) One or more types selected from polyoxyethylene hydrogenated castor oil of HLB 10 to 15 (C) 12 carbon atoms It contains one or two or more (D) water (E) electrolytes selected from -22 higher alcohols and / or fatty acid monoglyceryl having 12 to 22 carbon atoms, and the average particle size of the emulsified droplets is 50 to 300 nm. An oil-in-water emulsified cosmetic ,
The content of the component (A) is 0.1 to 5% by mass,
The content of the component (B) is 0.1 to 5% by mass,
The content of component (C) is 0.01 to 5% by mass; and
An oil-in-water emulsified cosmetic having an electrical conductivity of 0.01 to 4.3 S / m at a temperature of 25 ° C. Further component (F) an oil-in-water emulsified cosmetic composition according to claim 1 containing phospholipids. The oil-in-water emulsion cosmetic according to claim 2 , wherein the content of the component (F) is 0.001 to 1% by mass. The oil-in-water emulsion cosmetic according to claim 2 or 3 , wherein the component (F) is a phospholipid having a phosphatidylinositol content of 20% by mass or more and a phosphatidylethanolamine content of 30% by mass or more. The oil-in-water emulsion cosmetic according to any one of claims 1 to 4 , wherein the content a of the component (A) and the content c of the component (C) satisfy c ≦ a. The oil-in-water emulsified cosmetic according to any one of claims 1 to 5 , wherein the content b of the component (B) and the content c of the component (C) satisfy c ≦ b. The component (C) contains one or more selected from higher alcohols having 12 to 22 carbon atoms and monoglyceryl fatty acids having 12 to 22 carbon atoms, according to any one of claims 1 to 6. Oil-in-water emulsified cosmetic. Further oil-in-water emulsified cosmetic according to any one of claims 1 to 7 containing a liquid oil. The oil-in-water emulsified cosmetic according to any one of claims 1 to 8 , which is a translucent cosmetic.