JP2010280643A - Skin cleansing composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skin cleansing composition comprising a bicontinuous type microemulsion which is low in an eye-irritating property even in a low surfactant concentration range of <15 mass% in the total amount of the composition and is stable in a wide temperature range. <P>SOLUTION: This skin cleansing composition comprises the bicontinuous type microemulsion comprising the following components (A) to (D): (A) one or more polyglycerol fatty acid esters selected from polyglycerol fatty acid esters comprising a branched fatty acid and glycerol and polyglycerol fatty acids esters comprising an unsaturated fatty acid and polyglycerol, and having a total HLB of 9 to 12, (B) a dihydric alcohol, (C) a liquid oil, and (D) water, wherein the component (A) is contained in an amount of ≥8 mass% and <15 mass% based on the total amount of the composition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a skin cleanser, and more specifically, it is bicontinuous that has low eye irritation and is stable over a wide temperature range even in a low concentration region where the surfactant in the entire composition is less than 15% by mass. The present invention relates to a skin cleansing composition comprising a microemulsion.

Conventionally, in order to obtain a microemulsion in which an oily component is solubilized in an aqueous phase or an aqueous component is solubilized in an oily phase, a surfactant, particularly a nonionic surfactant has been used in many cases. However, in particular, polyethylene glycol type nonionic surfactants such as polyethylene glycol alkyl ethers generally change their affinity with water by increasing the temperature. Therefore, in a microemulsion using them, the stable temperature range is , It becomes very narrow from the solubilization limit shown in the phase diagram to the cloud point.

As a method for improving the stability of the microemulsion with respect to the temperature while using a nonionic surfactant, a method using an anionic surfactant in combination with a nonionic surfactant (Patent Document 1), an aqueous phase or an oil phase A method for controlling the composition (Patent Document 2), a method for controlling the type and combination of nonionic surfactants used (Patent Document 3), and the like are conventionally known.

However, in these methods, when an anionic surfactant is used in combination with a nonionic surfactant, a specific ratio is indispensable, and the viewpoint of blending that it is not suitable for formulation, the oily feeling becomes strong. From the viewpoint of the feeling of use such as, etc., it was not satisfactory enough to be applied as a skin cleanser composition. Moreover, even if it can utilize as a skin cleaning composition from the said viewpoint, the temperature range in which a microemulsion can exist stably was not enough.

Moreover, in recent years, a method for improving the stability of a bicontinuous microemulsion with respect to temperature has been improved while using a conventional nonionic surfactant, and specific methods such as Patent Document 4 and Patent Document 5 have been improved. A method in which a nonionic surfactant and a specific water-soluble solvent are combined is known.

Patent Document 4 describes a microemulsion containing polyglycerin fatty acid ester, polyoxyethylene fatty acid ester, monoglycerin monofatty acid ester, polypropylene glycol, ethanol, and propylene glycol. However, a composition containing a polyoxyethylene fatty acid ester is highly irritating to the eyes, and is not suitable as a skin cleansing composition to be applied near the mucous membrane of the eyes or the like in the present invention.

Patent Document 5 describes a microemulsion containing a polyethylene glycol fatty acid ester, a polyglycerin fatty acid ester, an alkyl polyglucoside, glycerins, and glycols. However, since the present invention does not take a bicontinuous type, it cannot simultaneously achieve a high makeup cosmetic removal power and a refreshed feel on the skin after rinsing.

As described above, the conventionally known methods are not sufficiently satisfactory from the viewpoints of formulation, temperature dependency, irritation, removing power of makeup cosmetics, skin feeling during use or after rinsing.

JP 58-128311 A Japanese Patent Laid-Open No. 10-43573 JP-A-11-262653 JP 2006-117463 A JP 2008-184414 A

An object of the present invention is to provide a skin cleansing composition comprising a bicontinuous microemulsion that has low eye irritation and is stable in a wide temperature range even in a low concentration region where the surfactant is less than 15% by mass. There is.

When the present inventors use a specific surfactant in combination with a specific water-soluble or oil-soluble raw material, even if the surfactant has a low concentration, it is stable in a wide temperature range with low eye irritation. The present inventors have found that a skin cleansing composition comprising such a bicontinuous microemulsion can be obtained.

That is, this invention contains the following (A)-(D) component, and the skin cleansing composition which consists of a bicontinuous type microemulsion whose (A) component is 8 to 15 mass% in the whole composition. It is.
(A) One or more selected from polyglycerin fatty acid ester composed of branched chain fatty acid and polyglycerin and polyglycerin fatty acid ester composed of unsaturated fatty acid and polyglycerin, and the total HLB is 9-12 Polyglycerin fatty acid ester (B) Divalent alcohol (C) Liquid oil (D) Water

The skin cleansing composition comprising the bicontinuous microemulsion of the present invention has a low eye irritation and a wide temperature range even when the surfactant in the entire composition is in a low concentration region of less than 15% by mass. It has excellent stability.

The microemulsions in the present invention are O / W type microemulsions in which micelles solubilize oil, W / O type microemulsions in which reverse micelles solubilize water, the association number of surfactant molecules becomes infinite, It refers to any state of a bicontinuous microemulsion having a continuous structure for both the phase and the oil phase. The properties of these microemulsions are transparent or translucent appearance, and are one-phase solutions in which all the components to be blended are uniformly dissolved. The O / W type microemulsion has a problem in that the removal power of makeup cosmetics is low when water forms a continuous phase and is used as a skin cleanser. Further, the W / O type microemulsion has a problem that when oil forms a continuous phase and is used as a skin cleanser, the stickiness is strong as a feeling after rinsing. Bicontinuous microemulsions have a continuous structure in both the water phase and the oil phase, so they have the characteristics of both O / W microemulsions and W / O microemulsions. When used, it has a high makeup cosmetic removal power, but can provide a refreshing feel after rinsing. In the present invention, the term “skin cleansing composition comprising a bicontinuous microemulsion” means that the association number of surfactant molecules is infinite, and both the aqueous phase and the oil phase have a continuous structure. It means a skin cleansing composition.

A microemulsion can obtain the same state as long as the composition and temperature are the same regardless of its production method. For this reason, said 3 component and other components can be mixed in arbitrary orders, and the microemulsion of the same state can be obtained also by stirring with the mechanical force of arbitrary work rates.

The (A) polyglycerol fatty acid ester used in the present invention is an esterification product composed of a branched chain fatty acid or an unsaturated fatty acid and polyglycerol. Examples of branched fatty acids include isostearic acid, and examples of unsaturated fatty acids include oleic acid and erucic acid. In addition, it is preferable to use polyglycerin having a degree of polymerization of 5 to 10.

Specific examples of the (A) polyglycerin fatty acid ester include decaglyceryl monoisostearate, decaglyceryl erucate, decaglyceryl diisostearate, pentaglyceryl oleate, and pentaglyceryl trioleate. These may be obtained by using commercially available raw materials such as Taiyo Kagaku Sunsoft Q-192Y and Mitsubishi Chemical Foods O-15D. By using only these (A) polyglycerin fatty acid esters as surfactants, when using polyoxyethylene nonionic surfactants commonly used in conventional microemulsions alone or in combination with polyglycerin fatty acid esters As compared with the case of using as a surfactant, a composition having less irritation and excellent stability in a wide temperature range can be obtained even in a low concentration region where the surfactant in the total composition is less than 15% by mass.

The polyglycerin fatty acid ester is 8% by mass or more and less than 15% by mass in the total composition, and the component (A) can be used alone or in combination of two or more, and the combined HLB value is 9-12. Is selected from those that are When the HLB value is less than 9 or more than 12, a microemulsion or a bicontinuous structure cannot be formed, and this range is a low surfactant with less than 15% by mass of the surfactant in the entire composition targeted by the present invention. Also in the concentration region, a continuous bicontinuous structure can be formed in both the water phase and the oil phase.

HLB is an index indicating a hydrophilic-lipophilic balance. In the present invention, the HLB value of the polyglycerin fatty acid ester is calculated from the following equation.
HLB = 20 (1-S / A)
S: Ester saponification value A: Neutralization value of fatty acid The HLB value of polyoxyethylene glycerin fatty acid ester is calculated from the following equation.
HLB = E / 5
E: Weight fraction of oxyethylene

Specific examples of the (B) divalent alcohol used in the present invention include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, isoprene glycol, dipropylene glycol, 1,3-butylene glycol and the like. In particular, dipropylene glycol and 1,3-butylene glycol are desirable. As the component (B), these divalent alcohols can be used alone or in combination of two or more. In monovalent or trivalent alcohol, sugar, and the like, the HLB range for forming a continuous bicontinuous structure in the water phase and the oil phase in the present invention cannot be adjusted.

In addition, the component (B) preferably has a mass ratio of 3/7 to 7/3 with respect to the component (D) in terms of functionality and formulation. If the mass ratio is less than 3/7, the removal power of the makeup cosmetics tends to be reduced, and it becomes difficult to obtain a skin feel and a rinsing property and a refreshing feeling after rinsing. There is a tendency that the later refreshing feeling cannot be obtained.

(C) liquid oil used by this invention can be used 1 type or in combination of 2 or more types, The mass ratio of (B) component and (D) component, and (C) component is 7 / 3-3. 9/1 is desirable both in terms of functionality and formulation. When the amount of the component (C) is less than 9/1, the cleansing force tends to be reduced. When the amount of the component (C) is more than 7/3, the rinsing speed and the refreshing feeling after rinsing cannot be obtained.

These (C) liquid oils can be liquid oils at 25 ° C., and examples include branched higher alcohols, branched higher fatty acids, higher fatty acid esters, and silicone oils. Specific examples include liquid paraffin, hydrogenated polyisobutene, liquid isoparaffin, squalane, isostearyl cholesteryl ester, 2-ethylhexanoic acid triglyceride, olive oil, and ethylhexyl palmitate.

In addition, the component (C) contains hydrocarbon oil in an amount of 8 to 11% by mass of the component (C), so that the component (A) is 5 ° C., even under a lower concentration condition where the component (A) is 12% by mass or less, A bicontinuous microemulsion that is stable in a low temperature region such as 0 ° C. can be obtained. As the component (A) becomes a low-concentration region, when the blending amount of the hydrocarbon oil in the component (C) is less than 8% by mass or more than 11% by mass, the composition becomes two-phase under the condition of the low-temperature region. It may not be possible to separate and maintain a bicontinuous microemulsion.

Specific examples of the hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene, liquid isoparaffin, squalane and the like.

The skin cleansing composition comprising the bicontinuous microemulsion of the present invention can be produced according to a conventional method. Further, the skin cleanser composition comprising the bicontinuous microemulsion of the present invention can be applied to the face or lips, etc., and can be used in any form for rinsing or wiping. Are preferably used.

Examples 1-17, Comparative Examples 1-14
A skin cleansing composition composed of a bicontinuous microemulsion having the composition shown in Tables 1 to 3 is manufactured, temperature stability is evaluated, and the composition shown in Tables 1 and 2 is also combined with a sensory test. evaluated. The results are shown in Tables 1 to 3. Further, with respect to Example 1, Comparative Example 12, and Comparative Example 13, eye irritation was evaluated using rabbit corneal cells (SIRC). The results are shown in Table 4. The present invention is not limited to these examples. A compounding quantity is the mass%.

Hereinafter, evaluation methods of each example and comparative example will be described.

<Sensory evaluation method>
Apply a commercially available oily foundation to the face of 20 female panelists, apply a commercially available water-resistant mascara to the eyelashes and leave for 30 minutes, then use about 3 g of the cleansing cosmetics of Examples and Comparative Examples for 1 minute. The face was hand massaged with a constant force and speed and then rinsed with water. At that time, each of the items of spread at the time of application, skin feel (in use), cleansing power, rinsing speed, and refreshing feeling after rinsing was evaluated in five stages, and further, the average score was determined according to the following criteria.
5-point evaluation 5 points: Very good 4 points: Good 3 points: Normal 2 points: Slightly bad 1 point: Bad judgment ◎: Average score is 4.5 points or more ○: 3.5 or more, less than 4.5 points : 2.5 or more, less than 3.5 points ×: Average point is less than 2.5 points

<Evaluation method for temperature stability>
10 ml of a skin cleansing composition comprising each bicontinuous microemulsion is placed in a transparent container, and after reaching 5 ° C., 10 ° C., 25 ° C., 40 ° C. and 45 ° C., uniformly mixed, 30 minutes A skin cleansing composition composed of each bicontinuous microemulsion in an equilibrium state was obtained. Thereafter, a water-soluble dye and an oil-soluble dye were added, respectively, and the appearance of the composition was visually observed for a bicontinuous structure. A sample in which both pigments were uniformly dyed was indicated as “◯”, and a pigment that was not uniformly dyed was indicated as “x”.

<Evaluation method of eye irritation using rabbit corneal cells (SIRC)>
SIRC cells were seeded in a MEME medium containing 10% fetal calf serum and cultured in a culture flask. The cells that became confluent in the culture flask were made into single cells using trypsin / EDTA solution, seeded on a 48-well plate so as to be (1 × 10) ⁴ cells / well, and cultured for 48 hours. After 48 hours of incubation, 200 μl of each 5% test sample was added and exposed to the cells for 5 minutes. After completion of the exposure, the plate was washed twice with PBS (−), 200 μl of MTT solution was added and reacted for 2 hours. After the reaction, the cell viability was measured by the absorbance of the extract. A higher survival rate means less irritation to the eye.

The manufacturing method is described.
<Production method> The main production methods are as follows. (A) component and (C) component were put into the container, and it heated and melt | dissolved at 75-80 degreeC, stirring. After the components (B) and (D) are similarly adjusted, the components (A), (C), (B), and (D) are placed in the same container and stirred at room temperature. It cooled and the skin cleansing composition which consists of each bicontinuous type | mold microemulsion was obtained.

As another formulation example, a skin cleansing composition comprising a bicontinuous microemulsion having the composition shown in Example 18 was produced, and good results were obtained for both temperature stability and eye irritation.

Example 18
(Ingredient name) (mass%)
1. Pentaglyceryl trioleate 2.0
2. Decaglyceryl diisostearate 8.0
3. 1,3-butylene glycol 19.0
4). Dipropylene glycol 24.0
5). Ethylhexyl palmitate 19.0
6). Cetyl 2-ethylhexanoate 0.3
7). Tri (caprylic acid / capric acid) glycerin 0.3
8). Mineral oil 0.3
9. Peach leaf extract 0.1
10. Grapefruit extract 0.1
11. Yuzu Extract 0.1
12 Cha extract 0.1
13. Novara extract 0.1
14 Grape extract 0.1
15. Aloe extract 0.1
16. Brown algae extract 0.1
17. Orange extract 0.1
18. Pomegranate extract 0.1
19. Rosehip extract 0.1
20. Hydrolyzed collagen 0.1
21. Sodium citrate 0.1
22. Citric acid 0.02
23. Edetic acid disodium 0.08
24. Paraben 0.05
25. Dye amount 26. Fragrance amount 27. Purified water residue

Claims (4)

A skin cleansing composition comprising a bicontinuous microemulsion comprising the following components (A) to (D), wherein the component (A) is 8% by mass or more and less than 15% by mass in the total composition.
(A) One or more selected from polyglycerin fatty acid ester composed of branched chain fatty acid and polyglycerin and polyglycerin fatty acid ester composed of unsaturated fatty acid and polyglycerin, and the total HLB is 9-12 Polyglycerin fatty acid ester (B) Divalent alcohol (C) Liquid oil (D) Water The skin cleansing composition according to claim 1, wherein the degree of polymerization of the polyglycerol is 5 to 10. The mass ratio of the component (B) to the component (D) is 3/7 to 7/3, and the mass ratio of the sum of the components (B) and (D) to the component (C) is 7/3. The skin cleansing composition according to any one of claims 1 and 2, which is? 9/1. The skin cleansing composition according to any one of claims 1 to 3, comprising 8 to 11% by mass of hydrocarbon oil in the component (C).