WO2013118836A1

WO2013118836A1 - Oil-in-water-type emulsion skin cleanser

Info

Publication number: WO2013118836A1
Application number: PCT/JP2013/052915
Authority: WO
Inventors: 義人西島; 桃藪; 謙太郎安達
Original assignee: 株式会社資生堂
Priority date: 2012-02-07
Filing date: 2013-02-07
Publication date: 2013-08-15
Also published as: JP2013177383A; JP5593406B2; TW201336521A

Abstract

Provided is an oil-in-water-type emulsion skin cleanser which has high cleansing performance, can be blended with a make-up product rapidly, has excellent emulsion stability, can be washed out easily, is smooth and therefore can be spread easily and has the form of an emulsion or a cream. An oil-in-water-type emulsion skin cleanser which comprises (a) 45 to 70 mass% of an oily component, (b) 10 to 30 mass% of a polyoxyethylene monofatty acid glyceryl having an HLB value of 8 to 14, (c) 10 to 45 mass% of water and (d) 0.01 to 1 mass% of a thickening agent and has the form of an emulsion or a cream.

Description

Oil-in-water emulsified skin cleanser

Related applications

This application claims the priority of Japanese Patent Application No. 2012-23680 filed on Feb. 07, 2012, and is incorporated herein.

The present invention relates to an oil-in-water emulsified skin cleansing material. More particularly, the present invention relates to a cleansing cosmetic composition for removing a make-up cream or cream.

In general, makeup cosmetics contain a large amount of oil, and skin cleans intended to remove the oil contain an oil for dissolving and dispersing the oil and / or an interface for emulsifying the oil. An active agent is blended. Therefore, a skin cleanser with a higher blending amount of oil and surfactant basically has a higher detergency. However, not only the blending amount but also the state of the composition, the detergency and the speed of cleaning (i.e. , Make-up familiarity) is greatly influenced.

In general, when considering a system consisting of oil, polyoxyethylene addition type nonionic surfactant and water, if the amount of oil and surfactant is high and water is low, reverse micelles with water as the internal phase are formed. To become a one-phase solubilized state (reverse micelle solution phase: L2 phase) or cause phase separation (phase II). When water is added to the reverse micelle solution phase, a lamellar liquid crystal is formed to become a liquid crystal one-phase system (Lα phase), and when water is further added, a two-phase coexistence system in which liquid crystal and other phases coexist ( Lc Present phase). When water is further added to this two-phase coexisting system, a one-phase solubilization system (micellar solution phase: L1 phase) or a multiphase system in which two or more phases coexist (Multi Phase phase) is obtained.

Of these, the L2 phase skin cleanser has an oily phase that is continuous with the make-up and can exhibit excellent cleaning power. However, it is difficult to remove by washing with water, and the skin after washing is oily. There is a problem of becoming addicted. In addition, the Lα-phase skin cleanser has a high viscosity and a heavy feel when applied, and the familiarity with the makeup occurs after the hard liquid crystal structure collapses, so that the familiarity with the makeup is slow. It is known that the Lc Present phase skin cleanser has no problem in terms of rinsing, but because it is slow in its make-up, it cannot be said that its cleaning power is sufficient, and it also has a squeaky feeling derived from the liquid crystal structure.

Unlike the phase formed under such a high blend of oil and surfactant, the L1 phase has a small blend of oil and surfactant, and a small amount of oil is stably retained as an internal phase (ie, Solubilized) is a phase in which excellent detergency and quick make-up cannot be expected.

On the other hand, the nature of the phase states included in the Multi Phase phase is very diverse. For example, in the case of a water-in-oil emulsified phase, the cleaning power is relatively high, but it is difficult to wash with water and the washed skin becomes oily. In the case of an oil-in-water emulsified phase, although it has a low detergency and a slow make-up, it has a desirable property as a skin cleanser that is well washed away and does not feel oily after washing. Both phases give a smooth feel unique to an emulsified phase, but in particular, emulsions and creams are very popular with consumers because they are easy to handle and excellent in use.
Reflecting such needs, many emulsion-creamy oil-in-water emulsified skin cleansing agents have been prepared (for example, Patent Document 1). Usually, these products are used to maintain the emulsion stability. The blending amount of the oil and the surfactant is kept low (particularly, the surfactant is usually 5% by mass or less). Therefore, the problem was low detergency and slow make-up.

Therefore, there has been a strong demand for the development of a skin cleanser that is an emulsion-cream-like oil-in-water emulsified phase but has high detergency, quick make-up, and excellent emulsification stability.

JP 2009-242340 A

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a milky-creamy form that has a high detergency, has a fast make-up, is excellent in emulsification stability, is easy to wash out, and is smooth and easy to stretch. An object of the present invention is to provide an oil-in-water emulsified skin cleansing material (particularly a cleansing cosmetic for make-up removal).

As a result of intensive studies by the present inventors in order to solve the above problems, by using polyoxyethylene monofatty acid glyceryl having an HLB of 8 to 14 as a surfactant, (a) the oil content is 45 to 70% by mass. (B) A mixed system consisting of 10 to 30% by weight of a surfactant and (c) 10 to 45% by weight of water has a liquid crystal composition in spite of a very high blend of oil and surfactant oil. It was found that an oil-in-water emulsified phase was formed without formation. Furthermore, it has been found that by adding 0.01 to 1% by mass of the thickening agent (d) to the system in which (a) to (c) are in the above-mentioned blending range, it is further excellent in easiness of elongation during use. It came to complete.

That is, according to the present invention, (a) oil content is 45 to 70% by mass, (b) HLB 8 to 14 polyoxyethylene mono fatty acid glyceryl is 10 to 30% by mass, and (c) water is 10 to 45% by mass. (D) An oil-in-water emulsified skin cleansing agent containing 0.01 to 1% by mass of a thickener and having a milky to creamy form is provided.

According to the present invention, an oil-in-water emulsified skin cleanser of the type to be washed away is provided.
The oil-in-water emulsified skin cleansing material of the present invention can be suitably used as a cleansing cosmetic for make-up removal.

According to the present invention, an emulsion-cream oil-in-water emulsified skin cleanser with high detergency, quick make-up, excellent emulsification stability, easy to wash out, and smooth and easy to stretch is provided. The oil-in-water emulsified skin cleansing material of the present invention can be suitably used as a cleansing cosmetic for make-up removal.

Hereinafter, the present invention will be described in detail. In the following, POE represents polyoxyethylene, PEG represents polyethylene glycol, and the numbers in parentheses indicate the number of added moles.

<(A) component>
As the component (a), any liquid, semi-solid, or solid oil that is commonly used in normal cosmetics, pharmaceuticals, and the like can be used. Examples of such oils include fats and oils, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, and the like.

As fats and oils, avocado oil, camellia oil, evening primrose 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, tea seed oil, kaya oil, rice bran oil, cinnagiri oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, trioctanoic acid glycerin, triisopalmitic acid Liquid fats such as glycerin; cacao butter, palm oil, horse fat, hydrogenated palm oil, palm oil, beef tallow, sheep fat, hydrogenated beef tallow, palm kernel oil, pork fat, beef bone fat, owl kernel oil, hydrogenated oil, cow leg Examples thereof include solid fats and oils such as fat, mole, and hardened castor oil.

The waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ibota wax, whale wax, montan wax, nuka wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, lauryl hexyl, reduced lanolin, jojojo Examples include a wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, and the like.

Examples of the hydrocarbon oil include liquid paraffin, isodecane, isododecane, isohexadecane, ozokerite, squalene, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and the like.

Higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, 12-hydroxystearic acid, undecylenic acid, tolic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and the like are exemplified.

Higher alcohols include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol; monostearyl glycerin ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, Examples thereof include branched chain alcohols such as cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate Lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearylate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid ester, N-alkylglycol monoisostearate, neopentyl glycol dicaprate, malic acid Diisostearyl, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexyl trimethylolpropane, triisos Trimethylol propane acrylate, penta-2-erythritol tetra-2-ethylhexylate, glycerol tri-2-ethylhexylate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri -2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleic oil, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldecyl ester, adipic acid diester -2-heptylundecyl, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyl adipate Rudeshiru, diisopropyl sebacate, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, etc. crotamiton (C13H17NO) are exemplified.

Examples of the silicone oil include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane; 3 Examples thereof include silicone resin and silicone rubber forming a three-dimensional network structure.

(A) The component is a detergency component. From the viewpoint of the detergency effect, the above oil can be arbitrarily used. However, when it is desired to obtain lightness when applied to the skin, preferably a hydrocarbon oil having a relatively low molecular weight ( For example, liquid paraffin, isododecane, etc.), synthetic ester oil (eg, cetyl octoate, octyl palmitate, etc.), silicone oil, etc. are preferably used. (A) A component can use 1 type (s) or 2 or more types.

The blending amount of component (a) is 45 to 70% by mass, preferably 50 to 65% by mass, and most preferably 55 to 60% by mass in the skin cleanser of the present invention. If it is less than 45% by mass, sufficient detergency cannot be obtained. On the other hand, if it exceeds 70% by mass, sufficient emulsion stability cannot be obtained, which is not preferable.

<(B) component>
The component (b) is polyoxyethylene monofatty acid glyceryl having an HLB of 8 to 14, preferably an HLB of 10 to 13. When the HLB is lower than 8, sufficient washability cannot be obtained, and when the HLB is higher than 14, it is not preferable from the viewpoint of emulsion stability.

Examples of (b) polyoxyethylene mono fatty acid glyceryl that can be used in the present invention include PEG-5 glyceryl isostearate (HLB = 8), PEG-6 glyceryl isostearate (HLB = 8), and PEG-5 stearate. Glyceryl (HLB = 9), PEG-8 glyceryl isostearate (HLB = 10), PEG-10 glyceryl isostearate (HLB = 10), PEG-10 glyceryl stearate (HLB = 11), PEG-15 glyceryl isostearate (HLB = 10) HLB = 12), PEG-15 glyceryl stearate (HLB = 13), PEG-20 glyceryl isostearate (HLB = 13), PEG-20 glyceryl stearate (HLB = 14), coconut oil fatty acid PEG-7 glyceryl (HLB) = 13) And the like.
Of these, PEG-8 glyceryl isostearate (= POE (8) glyceryl monoisostearate), PEG-20 glyceryl isostearate (= POE (20) glyceryl monoisostearate), PEG-7 coconut oil fatty acid glyceryl (= POE). (7) Palm oil fatty acid glyceryl) can be suitably used, and commercially available products include Emalex GWIS-108 (Nippon Emulsion Co., Ltd.), Emarex GWIS-120 (Nippon Emulsion Co., Ltd.), Cethiol HE ( Cognis Japan Co., Ltd.).

The amount of component (b) is 10 to 30% by mass, preferably 15 to 25% by mass, and most preferably 15 to 20% by mass in the skin cleanser of the present invention. If it is less than 10% by mass, the effect of easy washing is not obtained, whereas if it exceeds 30% by mass, it is not preferable from the viewpoint of emulsion stability.
In the skin cleanser of the present invention, (b) a nonionic surfactant other than the polyoxyethylene monofatty acid glyceryl of HLB 8 to 14 can be blended within a range not impairing the effects of the present invention.

<(C) component>
The component (c) is water. The amount of component (c) is 10 to 45% by mass in the skin cleanser of the present invention.

The oil-in-water emulsified skin cleansing agent of the present invention containing the above components (a) to (c) as essential components has a milky lotion to a creamy shape, and is easy to wash, easy to wash off, smooth when used, Excellent emulsification stability. Milky to creamy has a viscosity range of about 100 to 100,000 mPa · s (measured at 30 ° C., B-type viscometer, 12 rotations / minute) (as a general guideline, emulsion: 100 to 10,000 mPa · s, cream form: 10,000 to 100,000 mPa · s).

<(D) component>
In the oil-in-water emulsified skin cleansing material of the present invention, (d) a thickener can be suitably blended in order to improve the ease of stretching during use. Such a thickener is particularly preferably a polysaccharide thickener, and examples thereof include xanthan gum, succinoglycan, agar, carrageenan, gellan gum, guar gum, locust bean gum and the like. Of these, succinoglycan and xanthan gum are preferable. In particular, when succinoglycan is used, it is possible to obtain an improvement effect on the emulsification stability and the skin feel after washing (no stickiness or smoothness).

In the present invention, thickeners such as carboxyvinyl polymer and alkyl-modified carboxyvinyl polymer can be blended in addition to the polysaccharide thickener. By using these thickeners in combination with polysaccharide-based thickeners, even when not using low molecular weight oil as component (a), it is possible to effectively obtain a soft feel when applied to the skin. be able to.

When the component (d) is blended, it is preferably about 0.01 to 2.5% by mass, more preferably 0.01 to 1% by mass, and most preferably 0.1 to 2.5% by mass in the skin cleanser of the present invention. 0.5% by mass.

<(E) component>
The oil-in-water type emulsified skin cleansing agent of the present invention further comprises (e) an anionic surfactant as a surfactant in addition to the above component (b) from the viewpoint of further improving the emulsion stability. You may mix | blend. As anionic surfactants, alkyl glycol acetates such as lauryl glycol acetate, POE alkyl sulfonates such as POE sulfosuccinate, POE alkyl ether sulfates such as POE lauryl ether sulfate, alkyl taurines such as cocoyl methyl taurate Salts, N-acyl-glutamate salts such as sodium N-lauroyl-L-glutamate, N-acylglycine salts such as sodium N-coconut fatty acid acylglycine, and fatty acid salts such as sodium laurate.

When the component (e) is blended, it is preferably about 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, and most preferably 0.1 to 2% by mass in the skin cleanser of the present invention. It is.

The oil-in-water emulsified skin cleanser of the present invention usually contains additional components that can be incorporated into the cleanser, such as moisturizers, preservatives, powders, pigments, fragrances, pH adjusters, etc., It can mix | blend suitably within the range which does not impair an effect.

The oil-in-water emulsified skin cleansing material of the present invention is preferably a wash-off type. The skin cleansing agent of the present invention can be easily washed away with water, and a refreshing feeling can be obtained.

The oil-in-water emulsified skin cleansing material of the present invention is particularly suitably used as a makeup removing cosmetic for removing makeup cosmetics such as foundation, lipstick, eye makeup (mascara, eyeline, etc.).

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto. Unless otherwise specified, all the amounts are mass%.
First, the evaluation items used in the present invention will be described.

(1) Property or phase state The property and phase state of the skin cleansing material immediately after preparation were visually evaluated. The presence or absence of the liquid crystal structure was also observed using a polarizing microscope after centrifuging the skin cleansing material. In addition, the thing in which the production | generation of the viscous phase with low fluidity by a liquid crystal structure was confirmed was judged as the Lc Present phase, and the thing in which the production | generation of the said viscous phase was not confirmed was judged as the Multi Phase phase.

(2) Detergency In order to evaluate the detergency (cleansing effect) of the skin cleanser of the present invention, the following tests were conducted.
A make-up cosmetic (water-in-oil (W / O) liquid foundation: (Makiage Lasting Liquid UV (OC30) (manufactured by Shiseido))) was applied to 2 cm × 12 cm artificial leather and dried sufficiently. On the other hand, after taking 0.2 g of a sample (skin cleanser) on 2 cm × 5 cm cotton, the sample-containing cotton was attached to one side of a square plate. Place the touch on the artificial leather coated with the prepared foundation, apply 10g of weight from the upper surface (the other side) of the board, reciprocate 10 times on the artificial leather, and then remove the foundation dirt remaining on the artificial leather. The reflectance (= the reflectance of the artificial leather after washing) was measured using a color difference meter, and compared with the original foundation application part, the sample (skin washing) To determine the cleaning rate of the fee).

D (%) = [(RW−RS) / (R0−RS)] × 100
D: Cleaning rate (%)
R0: Reflectivity (%) of artificial leather before applying makeup cosmetics
RS: Reflectivity of artificial leather after applying makeup cosmetic (%)
RW: Artificial leather reflectance after washing (%)
(Criteria)
A: The cleaning rate is 90% or more.
○: The cleaning rate is 80% or more and less than 90%.
X: The cleaning rate is less than 80%.

(3) Make-up familiarity In order to evaluate the make-up quickness of the skin cleansing material of the present invention, 8 people from a specialized panel made up the make-up (when using W / O liquid foundation as a makeup cosmetic). Judgment of the speed of.
(Criteria)
A: All eight responded that they were familiar with the makeup.
○: 5 to 7 out of 8 responded that make-up familiar.
×: 0 to 4 out of 8 responded that they were familiar with the makeup.

(4) Emulsification stability In order to evaluate the stability (emulsification stability with time) of the skin cleanser of the present invention, the appearance after standing at 50 ° C. for 1 month is visually observed, and the stability is observed according to the following criteria. evaluated.
(Criteria)
A: Oil floating, separation, other appearance changes were not observed, and the emulsion particle size was not changed.
○: Oil floating, separation, and other appearance changes were not observed. Although there was a slight change in the emulsified particle size, there was no practical problem.
X: Significant changes in appearance such as remarkable oil floating, oil phase separation, and viscosity change occurred.

(5) Ease of rinsing Ease of rinsing of the skin cleansing material of the present invention was evaluated by eight specialist panels, with ease of rinsing after washing with water (use of W / O liquid foundation as makeup cosmetic). Judgment was made.
(Criteria)
◎: All 8 responded that it was easy to wash away with water after make-up removal.
○: 5 to 7 out of 8 responded that it was easy to wash away with water after make-up removal.
×: 0 to 4 out of 8 responded that it was easy to wash away with water after make-up removal.

(6) Smoothness at the time of use In order to evaluate the smoothness at the time of use of the skin cleansing material of the present invention, 8 specialist panels were asked to evaluate the smoothness at the time of use according to the following criteria.
(Criteria)
A: All eight responded that they were smooth when in use.
○: 5-7 out of 8 responded that they were smooth when in use.
×: 0 to 4 out of 8 responded that they were smooth when in use.

(7) Ease of use during use In order to evaluate the easiness of use of the skin cleansing material of the present invention, eight specialist panels evaluated the easiness of use during use according to the following criteria.
(Criteria)
A: All eight responded that it was easy to extend when in use.
○: 5 to 7 out of 8 responded that it is easy to extend during use.
×: 0 to 4 out of 8 responded that it was easy to extend during use.

In addition, the following compounds were used for this-application test example.
* 1: KF-96A-6cs (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 2: Emarex GWIS-108 (Nippon Emulsion Co., Ltd.)
* 3: Emarex GWIS-120 (Nippon Emulsion Co., Ltd.)
* 4: Cethiol HE (manufactured by Cognis Japan)
* 5: Emarex GWIS-160 (Nippon Emulsion Co., Ltd.)
* 6: EMALEX GWIS-220EX (Nippon Emulsion Co., Ltd.)
* 7: EMALEX GWIS-320 (manufactured by Nippon Emulsion Co., Ltd.)
* 8: Silicon KF-56 (manufactured by Shin-Etsu Chemical Co., Ltd.)

[Test Example 1: Examination of the phase state of a three-component mixed system consisting of oil, surfactant, and water]
The oil components, surfactants, and water shown in Tables 1 and 2 below were mixed at the stated blending ratios, and the phase state of the three-component mixed system was evaluated.

From Table 1, when the surfactant used was glyceryl POE monoisostearate (Test Examples 1 to 5) or POE (7) coconut oil fatty acid glyceryl (Test Examples 6 to 10) with HLB = 10 to 13, In a three-component mixed system containing a) 35% to 70% by weight of oil, (b) 15 to 25% by weight of a surfactant, and (c) 15 to 40% by weight of water, an emulsion in an oil-in-water emulsion phase It became clear that was formed. Also, when a plurality of these surfactants were combined, emulsion oil-in-water emulsion phases were obtained (Test Examples 11 and 12).
In contrast, when POE glyceryl monoisostearate having an HLB of 16 was used as the surfactant, phase separation occurred immediately even when the blending ratio of oil, surfactant and water was within the above range. (Test Example 13) In addition, when POE glyceryl diisostearate (Test Examples 14 to 17) with an HLB of 10 and POE glyceryl triisostearate (Test Examples 18 to 21) with an HLB of 8 were used, a liquid crystal was formed to form an LcPresent phase. (Table 2).

From these results, a POE fatty acid glyceryl having an HLB of 8 to 14 and a monoester of a fatty acid and glycerin, that is, a POE mono fatty acid glyceryl (HLB = 8 to 14) is selected as a surfactant. As a result, it was revealed that an oil-in-water emulsified phase was obtained even in a mixed system containing 35 to 70% by mass of oil, 10 to 30% by mass of surfactant, and the balance water.

[Test Example 2: Performance evaluation of skin cleanser]
Next, an oil-in-water emulsion composition in which the blending amounts of (a) to (c) were within the above range and (d) a thickener was blended was prepared, and the performance as a skin cleanser was evaluated.

As shown in Table 3, (a) 50% by mass of liquid paraffin and cetyl octanoate as the oil component, (b) 15% by mass of POE (8) glyceryl monoisostearate (HLB = 10), (d) increase A cleaning agent (Example 1) comprising 0.1% by weight of carboxyvinyl polymer as a sticking agent and the balance of (c) water and an aqueous component forms an emulsion of an oil-in-water emulsion in water. It was excellent in all of the detergency, emulsification stability, washability, smoothness during use and ease of extension. And in the said washing | cleaning material (a) the washing | cleaning material (Example 2, 3) which replaced a part of oil component (= cetyl octanoate) with isododecane, dimethylpolysiloxane, and methylphenylpolysiloxane, further improvement of the detergency was achieved. Admitted.

Looking at (b), (a) POE monoisostearic acid having an HLB of 10 to 13 as (b) in a composition containing 50 to 55% by weight of oil and (d) 0.1% by weight of carboxyvinyl polymer. The cleaning agent containing 15% by mass (Examples 1 to 3), 20% by mass (Example 4) and 25% by mass (Example 5) of glyceryl and POE (7) coconut oil fatty acid glyceryl is a stable oil-in-water solution. Formed emulsified phase, it was revealed that it was excellent in make-up familiarity and easiness of spreading, and also excellent in detergency, washability and smoothness during use. In particular, from the results of Examples 4 and 5, it can be seen that when the amount of (b) is increased, the washability tends to be improved.
In contrast, when POE glyceryl monostearate having an HLB of 16 was used as (b), separation occurred immediately after mixing, and the performance could not be evaluated (Comparative Example 1).

As (d), the carboxyvinyl polymer, xanthan gum, succinoglycan, or a cleaning agent containing 0.1 to 0.15% by mass of these in combination was extremely excellent in easiness of extension during use ( Examples 1 to 9). In particular, when succinoglycan was blended, it was shown that the emulsion stability and smoothness during use were further improved (comparison between Example 2 and Examples 8 and 9).

From the above results, in order to obtain an emulsion-cream-like oil-in-water emulsified skin cleanser with high detergency, quick make-up, and excellent emulsification stability, washability and smoothness, 45 to 70% by mass, (b) 10 to 30% by mass of polyoxyethylene monofatty acid glyceryl having an HLB of 8 to 14, (d) 0.01 to 1% by mass of a thickener, and (c) 10% of water. It was revealed that the composition should be contained at 45% by mass.

[Test Example 3: (e) Effect of anionic surfactant]
Furthermore, the effect of the (e) anionic surfactant in the skin cleansing material of the present application was examined. A skin cleanser having the formulation described in Table 4 below was prepared and performance was evaluated.

It became clear that when (e) anionic surfactant (cocoyl methyl taurine sodium) was added to components (a) to (d) according to the present invention in an amount of 0.1 to 1% by mass, the emulsion stability was further improved. (Comparison between Examples 1 and 10 and Examples 6 and 11 and 12). However, for a detergent using POE (60) glyceryl monoisostearate (HLB = 16) as a surfactant, phase separation could not be suppressed even when component (e) was added (comparison) Example 2).
Therefore, (a) 45 to 70% by weight of oil, (b) 10 to 30% by weight of polyoxyethylene monofatty acid glyceryl having an HLB of 8 to 14, (d) 0.01 to 1% by weight of thickener, and (C) A skin cleanser with further improved emulsification stability can be obtained by further adding (e) an anionic surfactant to the oil-in-water emulsified skin cleanser of the present invention containing 10 to 45% by mass of water. It was shown that.

Hereinafter, examples of formulating the skin cleanser according to the present invention will be shown, but the present invention is not limited thereto. A skin cleansing material having the following formulation was prepared according to a conventional method, and the aforementioned performance evaluation was performed. All skin cleansers were emulsion-creamy oil-in-water emulsified phases with high detergency and quick make-up, and excellent emulsification stability, washability, smoothness, and ease of extension.

Formulation Example 1 (cleansing milk, emulsion)
Formulation Amount (% by mass)
(1) Liquid paraffin 30.0
(2) Cetyl octanoate 10.0
(3) Isododecane 10.0
(4) Dimethylpolysiloxane (6cs) 5.0
(5) POE (8) glyceryl monoisostearate * 2 5.0
(6) POE (7) Palm oil fatty acid glyceryl * 4 5.0
(7) Sodium lauryl glycol acetate 1.0
(8) Succinoglycan 0.1
(9) Acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer (polyquaternium-39)
1.0
(10) 1,3-butylene glycol 2.0
(11) Edetate 0.2
(12) Purified water residue

Formulation Example 2 (cleansing milk, emulsion)
Formulation Amount (% by mass)
(1) Liquid paraffin 45.0
(2) Cetyl octanoate 25.0
(3) POE (7) Palm oil fatty acid glyceryl * 4 15.0
(4) Carboxyvinyl polymer 0.2
(5) Succinoglycan 0.03
(6) Dipropylene glycol 1.0
(7) Potassium hydroxide 0.05
(8) Edetate 0.2
(9) Purified water residue

Formulation Example 3 (cleansing milk, cream)
Formulation Amount (% by mass)
(1) Liquid paraffin 50.0
(2) Cetyl octanoate 10.0
(3) POE (8) glyceryl monoisostearate * 2 10.0
(4) Carboxyvinyl polymer 0.6
(5) Dipropylene glycol 1.0
(6) Highly polymerized polyethylene glycol (PEG-90M) 0.03
(7) Potassium hydroxide 0.30
(8) Edetate 0.2
(9) Purified water residue

Formulation Example 4 (cleansing milk, cream)
Formulation Amount (% by mass)
(1) Liquid paraffin 20.0
(2) Cetyl octanoate 25.0
(3) POE (7) Palm oil fatty acid glyceryl * 4 15.0
(4) Carboxyvinyl polymer 0.8
(5) Succinoglycan 0.1
(6) Dipropylene glycol 1.0
(7) Dimethyl diallylammonium chloride / acrylamide copolymer (polyquaternium-7)
0.5
(8) Potassium hydroxide 0.4
(9) Edetate 0.2
(10) Purified water residue

Formulation Example 5 (cleansing milk, emulsion)
Formulation Amount (% by mass)
(1) Liquid paraffin 25.0
(2) Cetyl octanoate 25.0
(3) POE (7) Palm oil fatty acid glyceryl * 4 30.0
(4) Carboxyvinyl polymer 0.2
(5) Dipropylene glycol 1.0
(6) Potassium hydroxide 0.1
(7) Edetate 0.2
(8) Purified water residue

Formulation Example 6 (cleansing milk, emulsion)
Formulation Amount (% by mass)
(1) Liquid paraffin 20.0
(2) Cetyl octanoate 25.0
(3) POE (7) Palm oil fatty acid glyceryl * 4 15.0
(4) Diisostearic acid PEG-12 2.0
(5) Carboxyvinyl polymer 0.15
(6) Succinoglycan 0.1
(7) Dipropylene glycol 1.0
(8) Dimethyldiallylammonium chloride / acrylamide copolymer (polyquaternium-7)
0.5
(9) Potassium hydroxide 0.4
(10) Edetate 0.2
(11) Purified water residue

Formulation Example 7 (cleansing milk, emulsion)
Formulation Amount (% by mass)
(1) Liquid paraffin 20.0
(2) Cetyl octanoate 25.0
(3) POE (10) glyceryl monoisostearate 15.0
(4) PEG-10 monoisostearate 3.0
(5) Carboxyvinyl polymer 0.15
(6) Glycerin 2.0
(7) Dimethyl diallylammonium chloride / acrylamide copolymer (polyquaternium-7)
0.5
(8) Potassium hydroxide 0.4
(9) Edetate 0.2
(10) Purified water residue

Claims

(A) 45 to 70% by mass of oil,
(B) 10-30% by mass of polyoxyethylene mono fatty acid glyceryl of HLB 8-14,
(C) 10 to 45% by mass of water,
(D) 0.01 to 1% by mass of a thickener,
An oil-in-water emulsified skin cleanser that is milky to creamy.
The oil-in-water emulsified skin cleanser according to claim 1, which is of a type that is washed away.
The oil-in-water emulsified skin cleanser according to claim 1 or 2, used as a cleansing cosmetic for make-up removal.