JP2006290762A - Oil-in-water emulsified composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-in-water emulsified composition having such high viscosity as to be creamy or jelly and capable of imparting the skin with refreshing feel when applied thereto. <P>SOLUTION: The oil-in-water emulsified composition comprises (A) 30.0 mass% or greater of an oil component liquid at 20°C and (B) an anionic surfactant, wherein the mass ratio A/B is (5:1) to (50:1). In this composition, the average size of the oil droplet particles is less than 0.3μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil-in-water emulsified composition, and in particular, to the improvement of its viscosity and improvement of freshness and refreshing feeling when applied to the skin.

  In recent years, oil-in-water emulsified cosmetics containing finely divided oils have been widely developed, and are widely used in skin care products, makeup products, hair care products, and the like. However, most of the preparations containing finely divided oils are in the form of a skin lotion with a low viscosity, and have not been applied to preparations that require a relatively high viscosity such as cream or gel. For high-viscosity oil-in-water emulsified preparations, for example, an example in which a large amount of solid oil is blended at room temperature is often found in the prior art (see, for example, Patent Documents 1 and 2). There was a problem in the feeling of use that the feeling of refreshing later was lacking (sticky).

JP 2001-157835 A JP 2002-87931 A

  The present invention was made for the problems of the prior art as described above, has a high viscosity such as cream or gel, and is used freshly and freshly when applied to the skin. An object is to provide an oil-in-water emulsion composition capable of imparting a feeling.

  As a result of intensive studies to solve the above problems, the present inventors have emulsified a preparation containing a large amount of liquid oil with a relatively small amount of an anionic surfactant, and further sufficiently finely formed oil droplet particles. In order to complete the present invention, it has been found that a highly viscous system such as cream or gel can be obtained, and that a fresh and refreshing feel can be obtained when applied to the skin. It came.

  That is, the oil-in-water emulsion composition according to the present invention is an oil-in-water emulsion composition containing (A) an oil that is liquid at 20 ° C. and (B) an anionic surfactant, and (A) The blending amount of the liquid oil is 30.0% by mass or more in the total amount of the composition, and the blending ratio (A) :( B) of (A) the liquid oil and (B) the anionic surfactant is 5: 1 to 50: 1, and the average particle size of the oil droplet particles is 0.3 μm or less.

  In the oil-in-water emulsion composition, the viscosity at 25 ° C. is preferably 5,000 to 200,000 mPa · s. In the oil-in-water emulsion composition, it is preferable that a solid or semi-solid oil component is not substantially contained at 20 ° C. In the oil-in-water emulsion composition, it is preferable that the water-soluble polymer is not substantially contained. The oil-in-water emulsion composition preferably further contains (C) a nonionic surfactant. Moreover, in the said oil-in-water type emulsion composition, it is suitable that (A) a silicone oil is included as a liquid oil component.

  In the oil-in-water emulsion composition, (B) the anionic surfactant is preferably one or more selected from amino acid derivatives, taurine derivatives, and phosphoric acid derivatives. In the oil-in-water emulsion composition, it is preferable that (C) the nonionic surfactant is a lipophilic surfactant having an HLB of 8 or less. In the oil-in-water emulsion composition, it is preferable that the average particle diameter of the oil droplet particles is 0.15 μm or less. In the oil-in-water emulsion composition, the viscosity at 25 ° C. is preferably 10,000 to 100,000 mPa · s.

  The oil-in-water emulsified composition according to the present invention is a highly viscous system that exhibits a cream or gel shape, and can impart a fresh and refreshing feeling when applied to the skin.

Hereinafter, preferred embodiments of the present invention will be described in detail.
(A) The oil component that is liquid at 20 ° C. used in the oil-in-water emulsion composition of the present invention is not particularly limited as long as it can be blended into a skin external preparation, and may be derived from natural products or synthesized. Good. For example, avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, flaxseed oil, safflower oil, Cottonseed oil, Eno oil, Soybean oil, Peanut oil, Tea seed oil, Kaya oil, Rice bran oil, Sinagiri oil, Japanese Kiri oil, Jojoba oil, Germ oil, Triisooctanoic acid glycerin, Triisopalmitic acid glycerin, Isopalmitic acid octylate, Isopropyl isostearate, isostearyl isostearate, isocetyl isostearate, hexyl isostearate, myristyl isostearate, isocetyl octoate, cetyl isooctanoate, isostearyl octoate, isodecyl isononanoate, octyldodecyl dimethyloctanoate, Oleyl stannate, isostearyl erucate, isocetyl stearate, octyl stearate, isostearyl palmitate, isocetyl palmitate, octyl palmitate, isostearyl myristate, isocetyl myristate, octyldodecyl myristate, decyl myristate, palmitic acid Isopropyl, isopropyl myristate, trimethylolpropane triisostearate, neopentyl glycol dicaprate, dioctyl sebacate, octyldodecyl 12-stearoyloxystearate, dioctyldecyl stearoylglutamate, dioctyl adipate, diisostearyl malate, methoxycinnax Octyl acid, octyl dodecyl lactate, isostearyl lactate, octyl paradimethylaminobenzoate , Liquid paraffin, squalane, isoparaffin, alpha-olefin oligomers, polybutene, volatile cyclic silicones, volatile dimethylpolysiloxanes, methyl phenyl silicone, oleyl alcohol, liquid oils, such as 2-octyl dodecanol. These can be used individually by 1 type or in combination of 2 or more types.

  Further, (A) as liquid oil, volatile cyclic silicone oil such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetradecamethylcycloheptasiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, By combining volatile dimethylpolysiloxanes such as tetradecamethylhexasiloxane and hexadecamethylheptasiloxane alone or in combination with other oils, an oil-in-water emulsion composition having a refreshing and good feeling of use can be obtained.

  The blending amount of the liquid oil (A) used in the oil-in-water emulsion composition of the present invention is 30.0% by mass or more based on the total amount of the composition. (A) If the liquid oil content is less than 30.0% by mass, the viscosity becomes too low, and the composition cannot be made into a gel or cream. More preferably, it is 30.0 to 60.0% by mass. If it exceeds 60.0% by mass, it is not preferable because it feels more oily than fresh when applied to the skin or hair.

  Examples of the (B) anionic surfactant used in the oil-in-water emulsion composition of the present invention include alkyl carboxylates, alkyl sulfonates, alkyl phosphates, fatty acid soaps, alkyl ether acetates, and alkyl sulfate esters. Alkyl ether sulfate ester salt, N-acyl sarcosine salt, fatty acid amide sulfonate salt, fatty acid phosphate ester salt, sulfosuccinate salt, alkylbenzene sulfonate salt, N-acyl glutamate salt and the like. These anionic surfactants can be used singly or in combination of two or more.

  Among these (B) anionic surfactants, amino acid surfactants, taurine surfactants, and phosphate surfactants that are excellent in stability, can be sufficiently supplied, and are widely used as external preparations for skin Is particularly preferred. The amino acid surfactant is not particularly limited as long as it is a surfactant having an amino group and a carboxyl group. Specifically, an N-acyl amino acid surfactant, an amide amino acid surfactant (imidazoline surfactant), Examples thereof include aminodiacetic acid surfactants. Specifically, amino acids such as N-methylglycine, N-methyl-β-alanine, glutamic acid, aspartic acid, sarcosine, valine, serine and phenylalanine (regardless of D-type and L-type) and their sodium and potassium salts An anionic surfactant comprising a salt such as triethanolamine salt or monoethanolamine salt and a higher fatty acid such as lauric acid, coconut oil fatty acid, palmitic acid or myristic acid, and particularly L-glutamic acid and its salts Anionic surfactants made from natural fatty acids are preferably used. Taurine surfactants include tauric acid such as N-alkyl taurine, N-dialkyl taurine, N-acyl taurine, N-acyl alkyl taurine, alkyl glutamate, acyl taurine salt, acyl alkyl taurine salt and sodium salt thereof. , Anionic surfactants such as potassium salt, triethanolamine salt, monoethanolamine salt and taurate. It is particularly preferable to use an N-acyl-N-alkyl taurine salt. Examples of phosphoric acid surfactants include phosphoric acid derivatives such as monoalkyl phosphoric acid, dialkyl phosphoric acid, and trialkyl phosphoric acid, and salts thereof.

  Although the compounding quantity of (B) anionic surfactant used for the oil-in-water type emulsion composition of this invention is not specifically limited, It is 0.6-10.0 mass% with respect to the composition whole quantity. It is preferably 1.0 to 1.5% by mass. If the amount is less than 0.6% by mass, it is impossible to emulsify a liquid oil to the extent that a sufficient effect can be obtained. If the amount exceeds 10.0% by mass, the feeling of use is inferior and the skin irritation becomes strong. It is not preferable.

  In the oil-in-water emulsion composition of the present invention, the blending ratio (A) :( B) of (A) liquid oil and (B) anionic surfactant is 5: 1 to 50: 1 by mass ratio. It is. When the blending amount of the (B) anionic surfactant is larger than 1/5 times the amount of the (A) liquid oil, the blending amount of the (B) anionic surfactant becomes relatively large and used. In addition to being inferior in touch, it is not preferable because the skin irritation becomes strong. On the other hand, when the amount is less than 1/50 times the amount of (A) liquid oil, it is impossible to emulsify the liquid oil to the extent that a sufficient effect is obtained.

  Moreover, in the oil-in-water emulsion composition of the present invention, the average particle size of the oil droplet particles is 0.3 μm or less, particularly preferably 0.15 μm or less. When the average particle diameter of the oil droplet particles exceeds 0.3 μm, it becomes a heavy touch when applied to the skin, and a fresh and refreshing feeling cannot be imparted. In the oil-in-water emulsified composition of the present invention, the mixed dispersion having the above-mentioned essential components can be used, for example, as a homomixer, a manton gourin, a French press, a colloid mill, a microfluidizer, or an ultrasonic emulsifier. By processing with a known emulsifier, the average particle diameter of the oil droplet particles can be adjusted to 0.3 μm or less. The average particle size of the oil droplet particles in the oil-in-water emulsion composition can be measured using a commercially available particle size measuring device such as a particle size analyzer FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.).

  The oil-in-water emulsion composition of the present invention obtained as described above usually has a viscosity at 25 ° C. of 5,000 to 200,000 mPa · s, even when a thickening component such as a solid oil component is not blended. It becomes about s. That is, according to the oil-in-water emulsified composition of the present invention, it is possible to obtain a system having a high viscosity without adding a thickening component such as a solid oil as conventionally used. In the present invention, the viscosity at 25 ° C. is measured with a single cylindrical rotary B-type viscometer (rotor number No. 6, rotation speed 10 rpm). For example, Bismetron (Shibaura System Co., Ltd.) It is possible to measure using a commercially available B-type viscometer. Moreover, in the oil-in-water emulsion composition of this invention, it is especially suitable that the viscosity in 25 degreeC is 10,000-100,000 mPa * s from a viewpoint on use feeling.

  Moreover, in the oil-in-water type emulsion composition of this invention, it is suitable not to contain a solid or semi-solid oil component substantially at 20 degreeC. When the oil-in-water emulsion composition substantially contains a solid or semi-solid oil component at 20 ° C., a sticky feeling is generated, and a fresh and refreshing feeling cannot be imparted. In the present invention, “substantially contains no solid or semi-solid oil at 20 ° C.” means that the oil contains a solid or semi-solid oil at 20 ° C. so as not to affect the feeling of use. More specifically, the solid or semi-solid oil component at 20 ° C. may be blended up to 0.1% by mass or less based on the total amount of the composition. Moreover, as a semi-solid or solid oil component at 20 ° C., for example, cacao butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hardened beef tallow, palm kernel oil, pork tallow, beef bone fat Solid oils such as beeswax kernel oil, hydrogenated oil, beef leg oil, molasses, hydrogenated castor oil; beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, botaro, whale wax, montan wax, nukarou, lanolin, kapok wax, lanolin acetate , Sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, polyoxyethylene (hereinafter abbreviated as “POE”) lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, POE hydrogenated Lanolin alcohol ether, etc. Class: hydrocarbon waxes such as polyethylene wax, paraffin wax, ceresin, petrolatum, microcrystalline wax, Lunacera, ozokerite; higher alcohols such as cetyl alcohol, cetostearyl alcohol, stearyl alcohol, behenyl alcohol; monostearyl glycerin ether (batyl alcohol) And fatty acid glycerides such as acetoglyceride and tri-2-heptylundecanoic acid glyceride.

  In the oil-in-water emulsion composition of the present invention, it is preferable that the water-soluble polymer is not substantially contained. When the oil-in-water emulsion composition substantially contains a water-soluble polymer, a sticky feeling is generated, and a fresh and refreshing feeling cannot be imparted. In the present invention, “substantially free of water-soluble polymer” does not exclude even a water-soluble polymer containing a trace amount that does not affect the feel of use, and more specifically. The water-soluble polymer may be blended up to 0.1% by mass or less based on the total amount of the composition. Examples of the water-soluble polymer include guar gum, locust bin gum, quince seed, carrageenan, galactan, gum arabic, tragacanth gum, pectin, mannan, starch, xanthan gum, dextran, succinoglucan, curdlan, hyaluronic acid, gelatin, Synthetic polymers such as natural polymers such as albumin and collagen, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, carboxy vinyl polymer, sodium polyacrylate, polyethylene glycol having a molecular weight of tens of thousands or more, ethylene oxide / propylene oxide block copolymer, Methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, methylhydroxypropy Cellulose, soluble starch, carboxymethyl starch, methyl starch, propylene glycol alginate, semisynthetic polymers such as alginates and the like.

  In the oil-in-water emulsion composition of the present invention, it is preferable to further blend (C) a nonionic surfactant. Further, by adding (C) a nonionic surfactant, the stability over time can be enhanced. Examples of (C) nonionic surfactants include polyoxyethylene (hereinafter abbreviated as “POE”) sorbitan fatty acid ester, POE glycerin fatty acid ester, POE fatty acid ester, POE alkyl ether, POE alkyl phenyl ether, POE poly Oxypropylene (hereinafter abbreviated as “POP”) alkyl ether, POE castor oil or hydrogenated castor oil derivative, POE beeswax / lanolin derivative, alkanolamide, POE propylene glycol fatty acid ester, POE alkylamine, POE fatty acid amide, sucrose fatty acid ester And polyether-modified silicone. These can be used individually by 1 type or in combination of 2 or more types.

  Further, by using a lipophilic surfactant having an HLB of 8 or less as the (C) nonionic surfactant, the temporal stability of emulsification can be further improved. Examples of lipophilic surfactants having an HLB of 8 or less include POE (10-50 mol) 2-octyldodecyl ether, POE (10-50 mol) decyl tetradecyl ether, POE (10-50 mol) oleyl ether, POE ( 10-50 mol) cetyl ether, POE (20-60 mol) sorbitan monooleate, POE (10-60 mol) sorbitan monoisostearate, POE (10-50 mol) dihydrocholesterol ether, POE (20-100) curing Castor oil derivative, POE (5-30 mol) POP (5-30 mol) 2-decyltetradecyl ether, POE (10-50 mol) POP (2-30 mol) cetyl ether, POE (10-80 mol) glyceryl Monoisostearate, POE (10-30 mol) glyceryl Ethylene oxide addition type surfactants such as nostearate, sorbitan fatty acid esters such as sorbitan monostearate, sorbitan sesquistearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, glyceryl monostearate, glyceryl monooleate Glyceryl fatty acid esters such as diglyceryl distearate, diglyceryl diisostearate, tetraglyceryl monostearate, tetraglyceryl monooleate, decaglyceryl tristearate, decaglyceryl trioleate, decaglyceryl pentastearate, decaglyceryl Polyglycerin fatty acid esters such as pentaoleate, and alkylene glycol fatty acid esters such as propylene glycol monostearate It is.

  Moreover, in this invention, a ultraviolet absorber can be suitably mix | blended further in an oil phase. Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2 ′, 4,4. Benzophenone ultraviolet absorbers such as' -tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 3- (4'-methylbenzylidene) -d, 1- Examples thereof include ultraviolet absorbers such as camphor, 3-benzylidene-d, 1-camphor, and 4-methoxy-4′-t-butyldibenzoylmethane.

  Moreover, in this invention, an oil-soluble chemical | medical agent or a fragrance | flavor can further be mix | blended suitably in an oil phase. Examples of oil-soluble drugs include retinol, retinol acetate, retinol palmitate, riboflavin butyrate, pyridoxine dicaprylate, pyridoxine dipalmitate, pyridoxine dilaurate, ascorbyl dipalmitate, ergocalciferol, cholecalciferol, tocopherols, Examples include tocopherol acetate, menadione, benzyl nicotinate, trichlorocarbanilide, trichlorohydroxydiphenyl ether, stearyl glycyrrhetinate, γ-oryzanol, and dibutylhydroxytoluene.

  In the oil-in-water emulsion composition of the present invention, components used in general skin external preparations such as propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, diethylene glycol, triethylene Glycols such as glycol; glycerols such as glycerin and diglycerine; sugar alcohols such as sorbitol, mannitol, maltitol, xylitol, erythritol; sugars such as fructose, glucose, galactose, maltose, lactose, trehalose; talc, kaolin, Inorganic powder such as mica, silica, zeolite; polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, cellulosic Organic powders such as powders; Inorganic white pigments such as titanium dioxide and zinc oxide; Inorganic red pigments such as iron oxide (Bengara); Inorganic yellow pigments such as yellow iron oxide and ocher; Black iron oxide, carbon black, etc. Black pigments; inorganic green pigments such as chromium oxide, chromium hydroxide and cobalt titanate; inorganic blue pigments such as ultramarine and bitumen; titanium oxide coated mica, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc. Pearl pigments; metal powder pigments such as aluminum powder and copper powder; red 201, red 202, red 204, red 205, red 220, red 226, red 228, red 405, orange 203, Organic pigments such as orange 204, yellow 205, yellow 401, and blue 404; red 3, red 104, red 106, red Zirconium, barium or aluminum lakes such as No. 27, Red 230, Red 401, Red 505, Orange 205, Yellow 4, Yellow 5, Yellow 202, Yellow 203, Green 3 and Blue 1 Organic pigments such as: Natural pigments such as chlorophyll and β-carotene; Vitamins such as magnesium ascorbate phosphate, glucoside of ascorbic acid, vitamin B6 hydrochloride, pantothenyl ethyl ether; Agents such as preservatives, preservatives, plant extracts, amino acids, and refreshing agents; lower alcohols such as ethanol and isopropyl alcohol can be appropriately blended within a range that does not impair the effects of the present invention.

  The oil-in-water emulsion composition according to the present invention can be used as a skin external preparation or a hair cosmetic. More specifically, for example, it is used as a gel, cosmetic liquid, milky lotion, cream for the purpose of skin care, skin external preparations such as sunscreen base, suntan base, cleaning base, hair cream, treatment, etc. It can be used as a hair cosmetic. In particular, it can be suitably used as a skin external preparation.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, this invention is not limited to these. The unit of the blending amount is all mass%.
First, the evaluation method used in the present invention will be described.

(1) Viscosity measurement Viscosity was measured using a bismetron (single cylinder rotary B-type viscometer, manufactured by Shibaura System Co., Ltd.) at 25 ° C., rotor number no. 6. Measurement was performed under the condition of the rotor rotation speed of 10 rpm.
(2) Measurement of particle size The particle size distribution was measured using a particle size analyzer FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.), and the average value of the particle size distribution was taken as the particle size.

(3) Evaluation of long-term stability Long-term stability was evaluated according to the following criteria under the temperature conditions of 0 ° C, room temperature, 37 ° C, and 50 ° C.
A: No abnormalities such as changes in viscosity and particle diameter are observed at each test temperature.
A: Abnormalities such as slight changes in viscosity and particle diameter are observed at 50 ° C. for one month.
(Triangle | delta): Abnormalities, such as a change of a viscosity and a particle diameter, are recognized by 37 degreeC and one month.
X: Abnormalities such as changes in viscosity and particle diameter are observed at room temperature and 0 ° C.
(4) Evaluation of Usability A use test for applying the composition of the present invention to the skin was conducted by 20 female panels, and the willingness to use the composition was evaluated according to the following criteria.
◎: More than 16 panels evaluated to be used by all means ○: 10 to 15 panels evaluated by all means Δ: 6 to 9 panels evaluated by all means ×: Panels evaluated by all means Is less than 5

Examples 1-1 to 6, Comparative Examples 1-1 to 7
Gel compositions were prepared according to the formulations shown in Table 1 and Table 2 below, viscosity and particle diameter were measured, and long-term stability and use tests were evaluated according to the above criteria. The results are also shown in Table 1 and Table 2.

  (Manufacturing method) The water phase of A mixed at 70 ° C. and the oil phase of B mixed at 70 ° C. are mixed at 70 ° C., using a high-pressure homogenizer NS2006 (manufactured by Niro Soavi), treatment pressure of 1,000 bar, treatment The emulsification treatment was performed under conditions of 7 times. The obtained composition was cooled to room temperature to obtain a gel composition. However, the emulsified composition of Comparative Example 1-2 was subjected to homomixer treatment under conditions of 9,000 rpm and 2 minutes instead of high pressure treatment. Moreover, about the composition of Comparative Example 1-7, the composition obtained from the aqueous phase of A and the oil phase of B and the aqueous phase of C mixed well at room temperature in advance were mixed and emulsified at room temperature, A gel composition was obtained.

  From the results shown in Table 1, it was revealed that the emulsified compositions of Examples 1-1 to 6 according to the present invention have high temporal stability and good use feeling. In particular, when silicone oil was used as the liquid oil as in Example 1-3, a gel-like composition having a light and fresh feel was obtained.

On the other hand, from the results of Table 2, in the emulsion composition of Comparative Example 1-1 using a cationic surfactant, it is not preferable because it is irritating to the skin, although freshness is obtained only during application. It was. Moreover, in the emulsified composition of Comparative Example 1-2 having a particle size of 1.5 μm, not only did it become a heavy feeling during application and the freshness was lost, but also the emulsion stability over time could not be ensured. Moreover, the emulsified composition of Comparative Example 1-3 in which the blending amount of the liquid oil is 15.0% is not only lacking freshness at the time of application, but also has a sufficient use feeling because of its low viscosity. I could not. Moreover, the emulsified composition of Comparative Example 1-4 in which the blending amount of the anionic surfactant is 1/4 times the amount of the liquid oil does not give a freshness only at the time of application, and also has irritation to the skin. It has occurred.
Moreover, the emulsified composition of Comparative Examples 1-5 and 6 in which a solid or semi-solid oil was blended at 20 ° C. was not preferable in terms of use feeling because it caused a sticky feeling during application. Furthermore, the emulsified composition of Comparative Example 1-7 containing a water-soluble polymer also had a sticky feeling and was not preferable in terms of stability over time.

Hereinafter, the present invention will be described in more detail with reference to other examples of the oil-in-water emulsion according to the present invention.
Example 2-1 (transparent moisturizing cream)% by mass
A. Water phase ion-exchanged water 40.47
Polyethylene glycol 400 0.1
Glycerin 12.0
1,3-butylene glycol 5.0
Sodium edetate 0.01
Citric acid 0.01
Sodium citrate 0.04
Methylparaben 0.1
Sodium N-stearoyl glutamate 0.8
B. Oil phase Liquid paraffin 35.0
Meadow Foam Oil 3.0
Octyl methoxycinnamate 3.0
2-Heptylundecanoic acid 0.2
Isostearic acid 0.2
Stearyl glycyrrhetinate 0.02
Fragrance 0.05

(Manufacturing method) The water phase of A mixed at 70 ° C. and the oil phase of B mixed at 70 ° C. are mixed at 70 ° C., and high pressure emulsification is performed under the conditions of a processing pressure of 1,000 bar and a processing frequency of 7 times. It was. The obtained composition was cooled to room temperature to obtain a creamy composition having a clear feeling. The obtained creamy composition had a viscosity of 60,500 mPa · s, an average particle size of 0.12 μm, a stability evaluation of “◎”, and an overall use test evaluation of “◎”.

Example 2-2 (gel emulsion)% by mass
A. Water phase ion-exchanged water 49.3
Glycerin 10.0
Methyl Gluces-10 8.0
Sodium metaphosphate 0.03
Methylparaben 0.1
L-Arginine 0.02
Thiotaurine 0.02
POE (60 mol) hydrogenated castor oil 0.2
Dimyristyl phosphate sodium salt 0.8
B. Oil phase Methylpolysiloxane (20cs) 20.0
Isononyl isononanoate 10.0
POE (20 mol) sorbitan
Monoisostearate 0.1
Jojoba oil 1.0
Oleyl alcohol 0.3
Tocopherol acetate 0.1
Retinol palmitate 0.01
Pyridoxine dipalmitate 0.01
Fragrance 0.01

(Manufacturing method) The water phase of A mixed at 70 ° C. and the oil phase of B mixed at 70 ° C. are mixed at 70 ° C., and high-pressure emulsification is performed under conditions of a processing pressure of 1,250 bar and a processing frequency of 5 times. It was. The obtained composition was cooled to room temperature to obtain a gel-like composition having a transparent feeling. The obtained gel-like composition had a viscosity of 12,000 mPa · s, an average particle size of 0.15 μm, a stability evaluation of “、”, and an overall use test evaluation of “◎”.

Example 2-3 (Moisturizing gel with transparency) Mass%
A. Water phase ion-exchanged water 34.71
1,3-butylene glycol 10.0
Glycerin 10.0
Xylitol 3.0
Urea 2.0
Betaine 2.0
L-Arginine 0.02
Sodium pyrosulfite 0.05
Methylparaben 0.2
Tranexamic acid 0.5
Palmitoylmethyl taurine sodium 1.2
B. Oil phase α-olefin oligomer 35.0
Glycerol monoisostearate 0.3
Sorbitan sesquiisostearate 0.8
Sorbitan trioleate 0.2
Ceramide 0.01
(CeramideII; manufactured by Quest International)
Phytosterol 0.01

(Manufacturing method) The water phase of A mixed at 70 ° C. and the oil phase of B mixed at 70 ° C. are mixed at 70 ° C., and high pressure emulsification is performed under the conditions of a processing pressure of 1,400 bar and a processing frequency of 5 times. It was. The obtained composition was cooled to room temperature to obtain a gel-like composition having a transparent feeling. The obtained gel composition had a viscosity of 88,000 mPa · s, an average particle size of 0.10 μm, a stability evaluation of “◎”, and a use test comprehensive evaluation of “◎”.

Example 2-4 (gel for hair)% by mass
A. Water phase Ion exchange water 46.18
1,3-butylene glycol 8.0
Propylene glycol 8.0
Erythritol 0.5
Xylitol 2.0
Betaine 2.0
L-Arginine 0.02
Sodium pyrosulfite 0.05
Methylparaben 0.2
Tranexamic acid 0.5
Palmitoylmethyl taurine sodium 1.2
B. Oil phase Methylpolysiloxane (5000cs) 30.0
Amino-modified methylpolysiloxane 0.5
Microcrystalline wax 0.8
Tocopherol 0.05

(Manufacturing method) The water phase of A mixed at 70 ° C. and the oil phase of B mixed at 70 ° C. are mixed at 70 ° C., and high pressure emulsification is performed under the conditions of a processing pressure of 1,000 bar and a processing frequency of 10 times. It was. The obtained composition was cooled to room temperature to obtain a gel-like composition having a transparent feeling. The obtained gel composition had a viscosity of 15,000 mPa · s, an average particle size of 0.16 μm, and stability over time. It was a gel that was easy to apply to hair due to its good elongation and smoothed hair.

Claims (10)

(A) an oil that is liquid at 20 ° C .;
(B) An oil-in-water emulsion composition containing an anionic surfactant,
(A) The blending amount of the liquid oil is 30.0% by mass or more in the total amount of the composition,
(A) Liquid oil content and (B) Anionic surfactant compounding amount ratio (A) :( B) is 5: 1 to 50: 1 by mass ratio,
An oil-in-water emulsion composition, wherein the oil droplet particles have an average particle size of 0.3 μm or less.   The oil-in-water emulsion composition according to claim 1, wherein the viscosity at 25 ° C is 5,000 to 200,000 mPa · s.   The oil-in-water emulsion composition according to claim 1 or 2, wherein the oil-in-water emulsion composition does not substantially contain a solid or semi-solid oil component at 20 ° C. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the oil-in-water emulsion composition does not substantially contain a water-soluble polymer. The oil-in-water emulsion composition according to any one of claims 1 to 4, further comprising (C) a nonionic surfactant. The oil-in-water emulsion composition according to any one of claims 1 to 5, wherein (A) a silicone oil is included as a liquid oil. The oil-in-water emulsion composition according to any one of claims 1 to 6, wherein (B) the anionic surfactant is one or more selected from an amino acid derivative, a taurine derivative, and a phosphoric acid derivative. A featured oil-in-water emulsion composition. The oil-in-water emulsion composition according to any one of claims 1 to 7, wherein (C) the nonionic surfactant is a lipophilic surfactant having an HLB of 8 or less. object. The oil-in-water emulsion composition according to any one of claims 1 to 8, wherein the average particle size of the oil droplet particles is 0.15 µm or less. The oil-in-water emulsion composition according to any one of claims 1 to 9, wherein the viscosity at 25 ° C is 10,000 to 100,000 mPa · s.