JP2001163726A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic good in extensibility without a stickiness feeling during the use. SOLUTION: This cosmetic of an O/W microemulsion type is obtained by applying a shear force corresponding to a high-pressure homogenizer treatment under >=400 atm to ingredients comprising (A) one or more kinds selected from an anionic and/or a nonionic surfactant, (B) an oil, (C) a polyhydric alcohol and (D) water. Thereby, the cosmetic can be produced with a smaller amount of the surfactant, and a toilet lotion good in extensibility without a stickiness feeling can be produced. The cosmetic is excellent in safety with slight skin irritation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an O / W type microemulsion, and more particularly to an O / W type microemulsion which can contain a large amount of oil even though the content of a hydrophilic surfactant is small. It relates to a microemulsion type lotion.

[0002]

2. Description of the Related Art Conventionally, refreshing lotion type cosmetics and skin external preparations have been frequently used. One of the methods for preparing such a lotion is a solubilizing type lotion, but in general, this type of lotion requires an increase in the amount of surfactant in order to incorporate a large amount of oil. Therefore, if the composition has a high oil content, the effect of the surfactant used for solubilization becomes strong, and the feeling of use tends to be sticky and not give the user a favorable feeling. For this reason, there has been a long-awaited need for a lotion in which the amount of the surfactant can be blended with at least a large amount of oil and the stickiness is greatly reduced.

[0003]

That is, the present invention provides an O / W emulsion type lotion which can contain an oil component at a weight ratio of 10 times or more that of a surfactant and is extremely stable. The purpose is to:

[0004]

Means for Solving the Problems The present inventors have made intensive studies on this point and found that A) one or more surfactants selected from anionic and / or nonionic surfactants, B) An O / W type microemulsion obtained by applying a shearing force corresponding to a high-pressure homogenizer treatment of 400 atm or more to a component containing an oil component, C) a polyhydric alcohol, and D) water, based on the total amount of the cosmetic. C + D
Is 90% by weight or more and the amount of B with respect to A is 10% by weight or more, so that even if the hydrophilic surfactant is very small, it contains a sufficient amount of oil,
It has been found that an emulsion type lotion having a refreshing feel can be obtained, and the present invention has been completed.

That is, the present invention relates to an O / W type microemulsion type lotion which can contain a large amount of oil with a very small amount of a hydrophilic surfactant, is stable over time and temperature, and has little skin irritation. It is.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

[0007] As the hydrophilic surfactant of the component A used in the present invention, in order to obtain an O / W type microemulsion, HLB is a hydrophilic anionic surfactant or a nonionic surfactant. Other than that, an ordinary hydrophilic surfactant can be used, and there is no particular limitation. Specific examples include anionic surfactants such as fatty acid soaps such as sodium laurate and potassium palmitate; higher alkyl sulfates such as sodium lauryl sulfate and potassium lauryl sulfate; and polyoxyethylene lauryl. Alkyl ether sulfates such as triliethanolamine sulfate, N-acyl sarcosine acids such as lauroyl sarcosine sodium, higher fatty acid amide sulfonates such as N-myristoyl-N-methyltaurine sodium, sodium polyoxyethylene oleyl ether phosphate Phosphate salts such as polyoxyethylene stearyl ether phosphate, sulfosuccinates such as sodium di-2-ethylhexylsulfosuccinate, sodium dodecylbenzenesulfonate, dodecylbenzenes Alkylbenzene sulfonates such as triethanolamine phonate and dodecylbenzene sulfonic acid; N-acyl glutamates such as monosodium N-lauroylglutamate, disodium N-stearoylglutamate and monosodium N-myristoyl-L-glutamate; Can be

Examples of the nonionic surfactant include polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene behenyl ether, and polyoxyethylene-2-yl. Alkyl ether type nonionic surfactants such as decyl pentadecyl ether, polyoxyethylene-2-decyltetradecyl ether, polyoxyethylene-2-octyldecyl ether, polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid monoester , Polyoxyethylene fatty acid diester, ester type nonionic surfactants such as polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl monoisostearate, Alkylene oxide-added nonionic interfaces such as ether ester nonionic surfactants such as loxyethylene glyceryl triisostearate, polyoxyethylene hydrogenated castor oil monoisostearate, and polyoxyethylene hydrogenated castor oil triisostearate Activators, polyhydric alcohol fatty acid ester type nonionic surfactants such as glycerin fatty acid esters such as decaglyceryl tetraolate, hexaglyceryl triisostearate, diglyceryl diisostearate, and glyceryl monooleate, and the like are included.

These hydrophilic surfactants can be used singly or in combination of two or more. However, from the viewpoint of easiness of emulsification and stability of microemulsion, it is better to use anionic surfactant mainly. More preferred. The oil component B used in the present invention is not particularly limited as long as it is an oil component usually used in cosmetics. Specific examples include liquid paraffin, squalane, vegetable squalane, squalene, pristane, paraffin, petrolatum Hydrocarbons such as dioctyl ether, diethers such as ethylene glycol dioctyl ether, cetyl octanoate, octyl dodecyl myristate, isopropyl palmitate, butyl stearate, myristyl myristate, decyl oleate, Monoesters such as oleyl oleate; higher alcohols such as isostearyl alcohol and octyldodecanol; unsaturated higher alcohols such as oleyl alcohol and lanolin alcohol; higher fatty acids such as eicosenoic acid; - ethylhexyl, diesters such as di-2-ethylhexyl adipate and the like, glyceryl ethers such as glycerol mono oleyl ether, acid amides such as lauroyl laurylamine, 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, linseed oil, safflower oil, cottonseed oil, eno oil, soybean oil, peanut oil, teaseed oil , Kaya oil, rice bran oil,
Plant and animal fats and oils, such as cinnamon oil, Japanese kiri oil, jojoba oil, germ oil, cocoa butter, and coconut oil. Among these oils, it is particularly preferable to use low-polarity oils such as liquid paraffin and hydrocarbon-based oils such as squalane, because the obtained O / W emulsion is further stabilized. In the present invention, one or more of these oil components are used.

In the O / W type microemulsion containing a small amount of such a hydrophilic activator, first, as a first step, a hydrophilic surfactant of the A component and an oil component of the B component are mixed with each other.
After preparing an O / W type microemulsion using an emulsifier capable of giving a strong shearing force, such as a high-pressure homogenizer or an ultrasonic emulsifier, together with a polyhydric alcohol as a component and a part of water as a D component, It can be easily produced by dispersing in a mixture of the remaining polyhydric alcohol of component C and water of component D in two steps. When a high-pressure homogenizer is used, emulsification is preferably performed at a pressure of 400 atm or more, and more preferably at a temperature of 50 ° C. or more and a pressure of 600 atm or more. The average particle size of the O / W type microemulsion thus obtained at the end of the first stage is preferably in the range of 0.01 to 0.2 µ.

It is desirable that the final aqueous phase component of the lotion is 90% or more of the total amount of the lotion. If the amount is less than this, it is difficult to obtain a refreshing lotion, which is not preferable. The amount of oil is not particularly limited as long as it does not exceed an unsuitable amount for a lotion. However, unless the amount of surfactant is less than 1/10 of the oil, the stickiness or skin caused by the surfactant may be reduced. Irritability is increased, which is not preferable.

By forming a microemulsion from such a composition using an emulsifier capable of giving a strong shearing force, the lotion of the present invention has an excellent feeling of use without stickiness and a surfactant. It has low skin irritation due to, and can be suitably used for consumers with sensitive skin, which has been increasing in consumers in recent years.

The O / W type microemulsion used in the present invention may contain, as an optional component, various components generally used in cosmetics, in addition to the hydrophilic surfactant, oil and water. . For example, ethyl alcohol,
Lower alcohols such as propyl alcohol and isopropyl alcohol, polyhydric alcohols such as ethylene glycol, propylene glycol, 1,3-butylene glycol, glycerin, diglycerin, diethylene glycol, dipropylene glycol, and polyethylene glycol;
Saccharides such as sorbitan, sorbitol, maltitol, maltotriose, mannitol, polysaccharides such as sodium hyaluronate, trehalose, sulfated trehalose and derivatives thereof, ascorbic acid, ascorbic acid phosphate, tocopherol, tocopherol acetate, vitamin A
Vitamins such as, preservatives such as parabens and chlorhexidine gluconate, antioxidants such as butylhydroxytoluene, gums such as gum arabic and carboxyvinyl polymers, pH adjusters such as citrate and acetate, UV absorbers such as para-aminobenzoic acid derivatives and benzophenone derivatives, powders such as titanium oxide, silica gel and talc, flavors and pigments, hyaluronic acid, placenta extract, ginseng extract, sterol glycosides, β-carotene, Pharmaceutical ingredients and the like according to various purposes such as superoxide desmutase can be arbitrarily selected and used. In addition, as long as the effects of the present invention are not impaired, in addition to the hydrophilic surfactant of the component A,
It is also possible to use a small amount of a lipophilic surfactant.

Next, the present invention will be described with reference to Production Examples and Examples. First, O / W of Production Examples 1 and 2 was performed using the components shown in Table 1.
A microemulsion was prepared, and then this O / W type microemulsion was used as a lotion having the composition shown in Table 2.

[0015]

[Table 1]

[0016]

[Table 2]

In both Production Examples 1 and 2, an O / W type microemulsion was prepared using a microfluidizer (manufactured by Mizuho Kogyo). The average particle size of the obtained microemulsion was observed with an optical microscope.
μ and 80 μm in Production Example 2. This microemulsion was diluted about 100 times with the aqueous phase component,
A translucent lotion was obtained.

<Stability test of lotion> Next, the lotion of Example 1 and a lotion prepared by using an O / W type microemulsion having the same composition as that of Preparation Example 1 prepared by using a normal disperser were used. Comparative Example 1, a lotion manufactured using an O / W type emulsion obtained by emulsifying with a microfluidizer by increasing the amount of a fatty acid and potassium hydroxide by 10 times (the amount of the increase is adjusted with water). As Example 2, these were treated at 40 ° C.
Was kept in a constant temperature room, and its temporal stability was compared using the visible light transmittance at 600 nm. Table 3 shows the results.

[0019]

[Table 3]

As is evident from the results in Table 3, the O
The lotion produced using the / W type microemulsion was very stable. In addition, the turbidity of the lotion manufactured by using the microfluidizer with increasing the amount of the surfactant was not so reduced, but precipitation occurred at 40 ° C. for 3 months.

<Use Test of Lotion> Using the lotion of Example 1 and the lotion of Comparative Example 2, sensory evaluation of the feeling of use was performed by 10 female panelists. The evaluation items were the presence or absence of good stickiness and spreadability after application, and the stickiness was 5: no stickiness was felt 4: a little sticky 3: a little sticky 2: a considerable sticky 1: Good feeling of stickiness. Good stretch 5: Very good 4: Good
3: Slightly clogged 2: Slow growth 1: Extremely poor
The evaluation was based on the average value of people. Table 4 shows the obtained results.

[0022]

[Table 4]

From the results shown in Table 4, it is proved that the O / W emulsion type lotion of the present invention has much better spreadability and no stickiness compared to the lotion in which the amount of the surfactant is increased 10 times. Was done. In the lotion of Comparative Example 2, there were two panelists who complained of a weak skin irritation after application, but none of the lotions of Example 1 felt the skin irritation.

[0024]

The O / W emulsion type lotion of the present invention can contain a large amount of an oil phase component and has a very stable O / W type despite having a low hydrophilic surfactant content. It can be used as an emulsion lotion. As a result, it has become possible to provide a lotion that has no stickiness and has good spreadability.

Claims (2)

[Claims] 1. A) one or more surfactants selected from anionic and / or nonionic surfactants, B) an oil component,
An O / W type microemulsion type lotion obtained by applying a shear force corresponding to a high-pressure homogenizer treatment of 400 atm or more to a component containing C) a polyhydric alcohol and D) water. 2. An O / W type microemulsion type lotion wherein (C + D) / (A + B + C + D) is 0.9 or more in weight ratio and B / A is 10 or more in weight ratio.