JP2002087931A - Oil-in-water type emulsified cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a transparent and high-viscosity oil-in-water type emulsified cosmetic good in feeling of use, capable of including a large amount of a liquid oil ingredient, stable within a wide temperature range and excellent in an oily feeling, a moist feeling, etc. SOLUTION: This oil-in-water type emulsified cosmetic comprises water, a hydrophilic surfactant, a liquid oil ingredient and a solid fat and has >=50% light transmittance at 550 nm and 200-1,000,000 mPa.s viscosity at 25 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-in-water emulsified cosmetic which can incorporate a large amount of oily components, has high viscosity and high transparency, and provides a stable emulsifying system in a wide temperature range.

[0002]

2. Description of the Related Art Transparent oil-in-water emulsion cosmetics are
For example, using a high-pressure emulsifier, the average particle size of the emulsified particles is set to 0.1.
It is produced by obtaining a fine emulsion of 2 μm or less (for example, JP-A-63-126543, JP-A-4-48925).

[0003]

However, the finely divided emulsion obtained by the high-pressure emulsification method generally has a low viscosity of several tens of mPa · s, and its use is limited. A gel-like emulsion having a relatively high viscosity can be used as various cosmetics such as a serum, a body lotion, and a hair treatment, but the above-mentioned finely divided emulsion cannot be used as it is because it has a low viscosity. There is a method of thickening with a water-soluble thickener. However, those thickened with a thickener are often sticky when dried after application, and there is a strong demand for an oil-in-water emulsified cosmetic that is transparent and high in viscosity and has a good feeling in use. An object of the present invention is to provide an oil-in-water emulsified cosmetic which is transparent, has high viscosity, has a good feeling in use, can contain a large amount of oily components, and is stable in a wide temperature range.

[0004]

The present inventors have achieved the above object by emulsifying an oil component containing solid fat and water together with a hydrophilic surfactant using an emulsifier having a strong shearing force. Is achieved.

The present invention contains water, a hydrophilic surfactant, a liquid oil component and a solid fat, and has a light transmittance of 550 nm of 50%.
As described above, the viscosity at 25 ° C. is 200 to 1,000,000.
It is intended to provide an oil-in-water emulsified cosmetic having a water pressure of 00 mPa · s.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil phase of the oil-in-water emulsified cosmetic composition of the present invention comprises a liquid oil component and a solid fat. Among them, the liquid oil component is a liquid at room temperature, and is an oil agent that produces two-phase separation when mixed with water at 20 ° C., which gives skin and hair flexibility and lubricity, forms a film, and forms a film. It is a component having an effect of suppressing intrusion of irritants and the like from the inside and moisture evaporation from the inside.

Examples of the liquid oil component include hydrocarbon oils such as liquid paraffin, squalane, n-octane, n-heptane and cyclohexane; ethers such as dioctyl ether, ethylene glycol monolauryl ether, ethylene glycol dioctyl ether and glycerol monooleyl ether. Oil: octyldodecyl myristate, isopropyl palmitate, butyl stearate, myristyl myristate, isopropyl myristate, di-2-ethylhexyl adipate, diisopropyl sebacate,
Ester oils such as neopentyl glycol dicaprate and tricaproin; saturated higher alcohols such as isostearyl alcohol and octyl dodecanol; unsaturated higher alcohols such as oleyl alcohol and lanolin alcohol;
Higher fatty acids such as eicosenoic acid, isomyristic acid and capric acid; higher fatty acid amides such as lauroyl laurylamine and butyl laurate; oils and fats such as olive oil, soybean oil and cottonseed oil; dimethylpolysiloxane, cyclic dimethylpolysiloxane, methylphenylpolysiloxane Silicone oils such as amino-modified silicone, epoxy-modified silicone, carboxy-modified silicone, alcohol-modified silicone, alkyl-modified silicone, polyether-modified silicone, and fluorine-modified silicone; perfluoroalkylethyl phosphate, perfluoroalkylpolyoxyethylene phosphate, Fluorinated oils such as perfluoropolyether and polytetrafluoroethylene are exemplified.

Particularly preferred are liquid paraffin, squalane, isopropyl palmitate, neopentyl glycol dicaprate, ethylene glycol monolauryl ether, perfluoropolyether and dimethylpolysiloxane. These oil components may be used in combination of two or more.

The oil-in-water emulsified cosmetic composition of the present invention preferably contains the liquid oil component in an amount of 0.5 to 80% by weight (hereinafter simply referred to as%), particularly preferably 3 to 70%.

Next, the solid fat is an oily substance which is solid at 25 ° C., and is preferably an aliphatic compound, and is preferably selected from aliphatic alcohols, cholesterol, fatty acids, aliphatic amide derivatives and aliphatic amine derivatives. Among them, the aliphatic alcohol is preferably a saturated aliphatic alcohol having 12 to 24 carbon atoms, such as lauryl alcohol, myristyl alcohol, cetanol, stearyl alcohol, and behenyl alcohol. As the fatty acid, a saturated fatty acid having 12 to 24 carbon atoms such as lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid is preferable. Examples of the aliphatic amide derivative include natural ceramides of types I to VI, N- (2-hydroxy-3-hexadecyloxypropyl) -N-2-hydroxyethylhexadecanamide, and N- (2-hydroxy-3 Ceramides such as -hexadecyloxypropyl) -N-2-hydroxyethyldecanamide and the like are preferred. As the aliphatic amine derivatives, sphingosine, dihydrosphingosine, phytosphingosine, dehydrosphingosine,
Dehydrophytosphingosine, sphingdienin and sphingosines such as N-methyl form or N, N-dimethyl form thereof, 1- (2-hydroxyethylamino)
-3-isostearyloxy-2-propanol and the like are preferred. Of these, cetanol, stearyl alcohol, cholesterol, stearic acid, palmitic acid, ceramides and similar substances, and sphingosines are particularly preferred.

The solid fat is contained in an amount of 0.5 to 15 parts by weight, preferably 1 to 10 parts by weight, based on 1 part by weight of the hydrophilic surfactant described below. The emulsified cosmetic preferably contains 1 to 30%, particularly preferably 2 to 20%.

In producing the oil-in-water emulsion cosmetic of the present invention, a hydrophilic surfactant is used. The hydrophilic surfactant is selected from an anionic surfactant, a cationic surfactant, an amphoteric surfactant and a nonionic surfactant having an HLB of 9 or more.
Those having 12 to 18 alkyl groups or alkenyl groups are preferred. In the present invention, hydrophilicity
When a surfactant, oil and water are mixed, an oil-in-water type (O /
W) Refers to a surfactant capable of forming an emulsion.

Examples of the anionic surfactant include, for example,
Higher fatty acid salts such as sodium laurate and potassium palmitate; alkyl sulfates such as sodium lauryl sulfate and potassium lauryl sulfate; alkyl ether sulfates such as polyoxyethylene lauryl sulfate triethanolamine; N- such as lauroyl sarcosine sodium; Higher fatty acid amide sulfonates such as acyl sarcosine salt and N-myristoyl-N-methyltaurine sodium, and phosphate esters such as sodium monostearyl phosphate, sodium polyoxyethylene oleyl ether phosphate and sodium polyoxyethylene stearyl ether phosphate. Salts, sulfosuccinates such as sodium di-2-ethylhexylsulfosuccinate, sodium linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonate trieta Alkylbenzene sulfonates such as Ruamin, N- lauroyl glutamate monosodium, disodium N- stearoylglutamic acid, N-
N such as myristoyl-L-monosodium glutamate
-Acyl glutamate and the like.

Examples of the cationic surfactant include, for example,
Examples thereof include alkyltrimethylammonium salts such as stearyltrimethylammonium chloride and lauryltrimethylammonium chloride, dialkyldimethylammonium salts, trialkylmethylammonium salts, and alkylamine salts.

Examples of the amphoteric surfactant include 2-undecyl-N, N- (hydroxyethylcarboxymethyl) -2-imidazoline sodium and 2-cocoyl-2.
Imidazoline amphoteric surfactants such as imidazolinium hydroxide-1-carboxyethyloxy disodium salt, 2-heptadecyl-N-carboxymethyl-N-
Betaine-based amphoteric surfactants such as hydroxyethylimidazolinium betaine, lauryldimethylaminoacetate betaine, alkylbetaine, amidobetaine and sulfobetaine, N-laurylglycine, N-lauryl β-alanine, N-stearyl β-alanine and the like Amino acid type amphoteric surfactants and the like can be mentioned.

The nonionic surfactant is preferably HLB 9 or more, especially HLB 10 to 17, in order to provide a stable emulsifying system.
Further, those having an HLB of 12 to 17 are preferred. Where H
LB is a hydrophilic-lipophilic balance (Hydrophilic-Lypop
This is an index that indicates hilic balance, and is defined by the following equation by Oda and Teramura et al.

[0017]

(Equation 1)

Examples of such nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene hydrogenated castor oil, polyoxyethylene glycerin fatty acid ester, and polyoxyethylene glycerin fatty acid ester. Oxyethylene sorbitan fatty acid ester, polyoxyethylene sorbite fatty acid ester, higher fatty acid sucrose ester, polyglycerin fatty acid ester, polyglycerin alkyl ether, alkyl glucoside surfactant and the like can be mentioned.

Among the hydrophilic surfactants, N-stearoyl arginine monosodium and N-stearoyl-L-
Monosodium glutamate, N-myristoyl-N-
Sodium methyltaurine, sodium N-stearoyl-N-methyltaurine, triethanolamine oleate, sodium polyoxyethylene (4) lauryl ether phosphate, polyoxyethylene (6) sodium tridecyl ether acetate, polyoxyethylene (30 )
Cetyl ether, stearyltrimethylammonium chloride and cetyltrimethylammonium bromide are preferred. Two or more of these hydrophilic surfactants may be used in combination.

In the oil-in-water emulsified cosmetic composition of the present invention, the content of the hydrophilic surfactant is 0.1 to 30%, preferably 0.1 to 6%.
It is good to contain.

The oil-in-water emulsion cosmetic composition of the present invention preferably contains the aqueous phase in an amount of 5 to 99.85%, particularly preferably 10 to 98.9%.

The oil-in-water emulsified cosmetic composition of the present invention comprises an oil phase containing a liquid oil component, a solid fat and an oil-soluble component added as appropriate, water, a hydrophilic surfactant and an optionally added water-soluble component. Prepared by emulsifying the aqueous phase with high shear at 200 ° C. at 25 ° C.
It has a viscosity of mPa · s, preferably 2,000 to 100,000 mPa · s. At this time, the average particle size of the oil phase emulsified particles to be emulsified and dispersed has a size of 0.01 to 0.2 μm. The average particle size is measured by a laser diffraction / scattering method.

In order to obtain an emulsified system of such fine oil droplets,
In the case of emulsification by high shearing force, the maximum shearing force is 10,000
0s^-1Above, especially 10,000 to 100,000,000
0s ^-1It is best to use an emulsifier that can provide a shear force equivalent to
No. Such a high shearing force, existing high-pressure emulsifier, for example,
Fill mix (manufactured by Tokushu Kika), Clear Mix (d
Mutechnic), Microfluidizer (Mizuho)
Industrial Co., Ltd.), DeBEE2000 (BEE
-National Corporation).

For example, when the injection pressure is 300 to 3,000 kg
The desired microemulsion can be obtained by setting the temperature / cm ² and the temperature in the range of 5 to 50 ° C.
However, the above operating conditions such as pressure and temperature are different depending on the specifications of the apparatus, and are not particularly limited. In addition, by subjecting the preliminary emulsion obtained by the ordinary emulsification method to the same high shearing treatment, a desired emulsification system can be obtained more efficiently. Moreover, you may repeat this high shearing force process as needed.

In this way, an oil-in-water emulsion having a high oil phase content and a high viscosity can be produced and further diluted with water or an aqueous medium to obtain an emulsion having an adjusted oil phase content and viscosity. . Here, the aqueous medium is a mixture of water and water-soluble alcohols, and the water-soluble alcohols include methanol, ethanol, propanol, isopropanol,
Ethylene glycol, propylene glycol, 1,3-
Butylene glycol, glycerin, sorbitol, mannitol, diethylene glycol, dipropylene glycol, polyethylene glycol (molecular weight 400 to 20,
000), sorbitan, sorbitol, maltose, maltotriose, sodium hyaluronate and the like.

At this time, the viscosity can be adjusted by adding a water-soluble polymer. Examples of water-soluble synthetic polymers include polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, polyacrylamide, polyvinylpyrrolidone, polyvinyl methyl ether, polyvinyl sulfone, maleic acid copolymer, polyethylene oxide,
Polydiallylamine, polyethyleneimine, water-soluble cellulose derivatives (for example, carboxymethylcellulose,
Methylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, cellulose sodium sulfate, etc.),
Starch derivatives (eg, oxidized starch, dialdehyde starch, dextrin, British gum, acetyl starch, starch phosphate, carboxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, etc.). As a water-soluble natural polymer,
Arabic gum, tragacanth gum, karaya gum, guar gum, guar gum, cod gum, locust bean gum, tamarind gum, sodium alginate, propylene glycol alginate, carrageenan, furcellulan, agar, high methoxy pectin, low methoxy pectin, chitin, chitosan, starch (eg, Starch derived from corn, potato, wheat, rice, potato, tapioca, etc., α-starch, soluble starch, etc., fermented polysaccharides (eg, xanthan gum, pullulan, curdlan, dextran, etc.), proteins (eg, sodium caseinate, gelatin) , Albumin, etc.), chondroitin sulfate,
Hyaluronic acid and the like.

Among these water-soluble polymers, polyethylene oxide (molecular weight of 100,000 to 5,000,000), polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, water-soluble cellulose, and carrageenan are preferable.

These water-soluble polymers are added, for example, to an aqueous phase heated to 60 ° C. with stirring to dissolve the mixture, and the mixture is allowed to cool to around room temperature, and then, if necessary, a neutralizing agent is added to form an aqueous gel. Can be formed. The content in the oil-in-water emulsion cosmetic of the present invention is usually 0.01 to 30%,
It differs depending on the type of each water-soluble polymer and the degree of neutralization, and is appropriately selected so that the viscosity of the compound falls within the above range.

The resulting oil-in-water emulsified cosmetic composition forms a stable micronized emulsion, and thus has high transparency in appearance. Here, the transparency can be evaluated by an ultraviolet-visible absorption spectrophotometer, and the transmittance of light having a wavelength of 550 nm is 50% or more.
It is preferably at least 60%.

The oil-in-water emulsified cosmetic of the present invention includes hair cosmetics such as hair liquid, hair mousse, shampoo, and rinse; cosmetics for shaving such as aftershave lotion; body lotions, face lotions, lotions,
It can be used as skin cosmetics such as serums and baths, body shampoos and the like. Components that are appropriately blended according to individual applications may be blended after obtaining the above-mentioned finely divided emulsion, or may be previously contained before high-speed shearing treatment.

[0031]

EXAMPLES Example 1 Of the components in Table 1, components other than water and ethanol
Propeller agitation was added to the phase that was previously mixed by heating and mixing at 0 ° C.
Preliminary emulsification was carried out by adding water at 80 ° C. below. Up to 25 ° C
After cooling, ethanol was added. This pre-emulsion is
High pressure emulsifier (DeBEE2000 (B.E.E.
Shear rate (10,000,000 s) ^-1) 10 times
The oil was passed through to produce an oil-in-water emulsion. In the table,
Example 1 shows an oil-in-water milk prepared similarly without using a solid fat.
Was increased by adding hydroxyethyl cellulose to
In Comparative Example 2, an aqueous gel obtained by simply mixing the components was used.
It is.

The light transmittance was measured using an ultraviolet-visible absorptiometer UV-1.
60 (manufactured by Shimadzu Corporation) and the absorbance at an absorption wavelength of 550 nm (cell length 1 cm). The viscosity was measured at 25 ° C. with a B-type rotational viscometer (rotor Nos. 1 to 4, rotation speed 6 r / min). The oiliness and moist feeling of the cosmetics were evaluated by a panel of 20 professionals, after washing their face with a cleansing foam, applying each cosmetic to the face, and evaluating the oiliness at the time of application and the moist feeling after drying. .

[0033]

[Table 1]

As shown in Table 1, the oil-in-water emulsified cosmetic of the present invention was excellent in transparency, high in viscosity without using a thickener, and excellent in oiliness and moistness.

Example 2 N-stearoyl-N-methyltaurine sodium
0 parts by weight, dimethylpolysiloxane 2cs (Shin-Etsu Chemical)
5 kg of a mixture of 10.0 parts by weight, 8.0 parts by weight of dipropylene glycol, 3.3 parts by weight of palmitic acid, 2.7 parts by weight of stearic acid and 75.0 parts by weight of purified water is preliminarily emulsified, and a high-pressure emulsifier ( DeBEE 2000) with a shear rate of 10,000,
The mixture was passed three times at 000 s ⁻¹ to produce a high-viscosity oil-in-water emulsion. The viscosity of the obtained oil-in-water emulsion is 27,500 mP
a · s, the particle size was 0.2 μm, and the light transmittance was 71%. Then, 15 kg of purified water was added to dilute the solution, and the viscosity was 170 mPa ·
s, a low-viscosity liquid cosmetic having an average particle size of 0.2 μm and a light transmittance of 93% was obtained. This liquid cosmetic required 30 minutes to produce a high-viscosity oil-in-water emulsion, and 10 minutes to dilute with purified water, and the entire process was produced in a short time of 40 minutes. A low-viscosity liquid cosmetic having the same composition can be obtained from the beginning by a high-pressure emulsification method without using a dilution method.
The processing time was doubled to 20 kg, and the processing time was quadrupled to 120 minutes.

In the same manner as in Example 1, oil-in-water emulsified cosmetics of the following examples were produced. Example 3 Composition: Polyoxyethylene (20) cetyl ether 1.0% Isopropyl palmitate 3.0 Glycerin 12.0 Cholesterol 4.0 Purified water 80.0 The produced oil-in-water emulsion cosmetic has a light transmittance of 63. %, Average particle size 0.4 μm, and viscosity 2,000 mPa · s.

Example 4 Composition: Monosodium N-stearoyl-L-glutamate 0.7% Neopentyl glycol dicaprate 4.0 Sorbitol 7.0 Ethanol 7.0 Cetanol 3.0 Stearyl alcohol 2.0 Purified water 76. 3. The produced oil-in-water emulsion cosmetic had a light transmittance of 69%, an average particle size of 0.22 μm, and a viscosity of 20,000 mPa · s.

Example 5 Composition: Sodium monostearyl phosphate 1.0% Squalane 7.0 1,3-Butanediol 2.2 12-Hydroxystearic acid 1.2 Palmitic acid 1.1 Stearic acid 0.9 Purified water 86.6 The produced oil-in-water emulsion cosmetic had a light transmittance of 77%, an average particle size of 0.14 μm, and a viscosity of 4,125 mPa · s.

Example 6 Composition: monosodium N-stearoyl-L-glutamate 1.0% perfluoropolyether 8.0 glycerin 9.4 ethanol 4.0 docosahexaenoic acid 1.2 cholesterol 2.3 purified water 74.1 The manufactured oil-in-water emulsion cosmetic had a light transmittance of 83%, an average particle size of 0.08 μm, and a viscosity of 13,000 mPa · s.

Example 7 Composition: sodium N-stearoyl-N-methyltaurine 2.0% dimethylpolysiloxane (6cs) 7.0 cetanol 4.8 stearyl alcohol 3.2 glycerin 5.5 purified water 77.5 The oil-in-water emulsion cosmetic had a light transmittance of 60%, an average particle size of 0.43 μm, and a viscosity of 4,200 mPa · s.

Example 8 Composition: Stearyltrimethylammonium chloride 2.0% Dimethylpolysiloxane (2cs) 20.0 Dipropylene glycol 15.0 Palmitic acid 2.4 Stearic acid 3.6 Ceramide-like substance ^*) 5.0 Purification Water 52.0 *) N- (2-hydroxy-3-hexadecyloxypropyl) -N-2-hydroxyethylhexadecanamide The oil-in-water emulsified cosmetic thus produced has a light transmittance of 75% and an average particle size of 0.1%. The viscosity was 1 μm and the viscosity was 27,000 mPa · s.

Example 9 Composition: monosodium N-stearoyl-L-glutamate 0.6% squalane 3.0 cholesterol 0.2 sorbitol 4.0 ethanol 7.0 phytosphingosine 3.0 palmitic acid 1.2 stearic acid 1 8.8 Purified Water 79.2 The produced oil-in-water emulsion cosmetic had a light transmittance of 70%, an average particle size of 0.18 μm, and a viscosity of 18,900 mPa · s.

The oil-in-water emulsified cosmetics of Examples 3 to 9 are -5
It was stable when stored at ４０40 ° C. for one year.

[0044]

According to the present invention, there is provided an oil-in-water type emulsified cosmetic which is transparent, has a high viscosity, has a good feeling in use, can contain a large amount of liquid oil components, is stable over a wide temperature range, and is excellent in oiliness and moistness. Can be given.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Atsushi Nakajima 2-1-3 Bunka, Sumida-ku, Tokyo Inside Kao Corporation Research Laboratory (72) Keigo Kajiwara 2-1-3 Bunka, Sumida-ku, Tokyo Kao Inside the Company Research Laboratory (72) Inventor Koichi Yanagita 2-1-3 Bunka, Sumida-ku, Tokyo Inside the Kao Corporation Research Laboratory (72) Yoshiaki Takahashi 2-1-3 Bunka, Sumida-ku, Tokyo Kao shares 4C083 AB051 AC022 AC072 AC102 AC122 AC132 AC172 AC182 AC242 AC252 AC302 AC352 AC392 AC642 AC662 AC692 AC792 AC902 AD152 AD282 AD492 BB02 BB12 BB13 DD23 DD27 DD33 EE01 EE03 EE06 EE07 FF05

Claims (3)

[Claims] 1. It contains water, a hydrophilic surfactant, a liquid oil component and a solid fat, and has a light transmittance at 550 nm of 50% or more,
The viscosity at 25 ° C is 200 to 1,000,000 mPa
oil-in-water emulsion cosmetics. 2. A pre-emulsion containing water, a hydrophilic surfactant, a liquid oil component and a solid fat, having a maximum shear rate of 10,000
2. The oil-in-water emulsion cosmetic according to claim 1, which is produced by applying a shearing force corresponding to ^{0 s -1} or more. 3. A liquid cosmetic prepared by diluting the oil-in-water emulsified cosmetic according to claim 1 with an aqueous medium.