Oil-in-water composition

Abstract

To provide an oil-in-water composition exhibiting superior stability over time, cleansing power, and rinsing speed.SOLUTION: An oil-in-water composition comprises: a lamellar gel phase including a combination of first, second, and third nonionic surfactants; an oil phase including an ester oil; and an aqueous phase, wherein the first nonionic surfactant has hydrophobic groups on either side of its hydrophilic moiety, the second nonionic surfactant has a hydrophilic moiety at its terminal, and the third nonionic surfactant is a glycerin ester or the like.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to oil-in-water compositions. [Background technology]

[0002] Conventionally, lamellar gel-containing skin topical preparations using lamellar gels (α-gels) formed by higher aliphatic alcohols or higher fatty acids and hydrophilic surfactants have been used to maintain the emulsion stability of skin topical preparations such as cosmetics, quasi-drugs, and pharmaceuticals. For example, low-molecular-weight oily components with low viscosity are suitable for cleaning agents for cleaning makeup cosmetics, but low-molecular-weight oily components have the property that surfactants are easily dissolved in them. For this reason, when low-molecular-weight oily components are emulsified in oil-in-water compositions, the stability may be insufficient.

[0003] In view of this, the use of a lamellar gel-containing composition that allows the blending of a high content of oily components and has high emulsion stability has been investigated (for example, Patent Document 1).

[0004] However, according to the studies of the present inventors, it has been found that there is room for further improvement in the detergency and rinsing speed of lamellar gel-containing compositions. Therefore, there is a need to improve the detergency and rinsing speed of compositions using conventionally known lamellar gels. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Patent Publication No. 2023 / 042687 Summary of the Invention

[0006] According to the present invention, the following inventions are provided. [1] a lamellar gel phase comprising a combination of a first, a second and a third nonionic surfactant; An oil phase containing 10% by mass to 50% by mass of an ester oil; and an aqueous phase, Where: (I) The first nonionic surfactant has the formula (1): [ka] (In the formula, R 1a each independently represents a linear acyl group or a linear alkyl group having 16 to 24 carbon atoms, R 1b is an alkylene group having 2 to 4 carbon atoms, n1b is an integer from 4 to 15. It is expressed by (II) The second nonionic surfactant has an HLB of 7 to 15 and is represented by the formulas (2-1) to (2-3): [ka] (In the formula, R 2a is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R 2b is an alkylene group having 2 to 4 carbon atoms, n2b is an integer between 5 and 20. [ka] (In the formula, R 2c is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R 2d each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2d is independently an integer of 1 or more, and the sum of all n2d is 5 to 20. [ka] (In the formula, R 2e each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2e is independently an integer of 1 or more, and the sum of all n2d is 5 to 30; R 2f is a straight-chain acyl group or straight-chain alkyl group having 16 to 24 carbon atoms. It is expressed by either (III) The third nonionic surfactant has an HLB value of 6 to 19 and is represented by the formula (3-1): [ka] (In the formula, R 3a each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3a is independently an integer of 1 or more, and the sum of the three n3a is 8 to 90; R 3b are each independently a hydrogen atom or an acyl or alkyl group having 16 to 24 carbon atoms; R 3b At least one of these is not hydrogen. or HLB 7 to 15, and is represented by the formula (3-2): [ka] (In the formula, R 3c each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3c is independently an integer of 1 or more, and the sum of the three n3c's is 10 to 100; R 3d each independently represents an alkylene group having 8 to 12 carbon atoms, R 3e are each independently an alkyl group having 4 to 8 carbon atoms, R 3f are each independently a polymer of 12-hydroxystearic acid or a polymer of alkylene polyol). It is expressed by Oil-in-water composition. [2] The composition described in [1], wherein the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant constitute at least a portion of the lamellar gel phase. [3] The composition according to [1] or [2], wherein the oil phase is emulsified by the lamellar gel phase. [4] The composition according to any one of [1] to [3], wherein the content of the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant is, respectively, 0.5 to 10.0 mass%, 1.8 to 3.6 mass%, and 2.0 to 20 mass%, based on the total mass of the composition. [5] The composition according to any one of [1] to [4], wherein the ratio of the content of the first nonionic surfactant to the content of the second nonionic surfactant is 0.4 to 4. [6] The composition according to any one of [1] to [5], wherein the ratio of the content of the third nonionic surfactant to the content of the second nonionic surfactant is 1 to 7. [7] The composition according to any one of [1] to [6], wherein the first nonionic surfactant is polyethylene glycol distearate, in which n1b is 4 to 8. [8] The composition according to any one of [1] to [7], wherein the lamellar gel phase has a higher eutectic point and melting enthalpy than a lamellar gel phase formed from one type of nonionic surfactant alone, the lamellar gel phase being selected from the group consisting of a second nonionic surfactant and a third nonionic surfactant. [9] The cleaning composition according to any one of [1] to [8], wherein the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant have an HLB weighted average of 6 to 10.

[10] The composition according to any one of [1] to [9], wherein the oil phase contains an oily component having a molecular weight of 400 or less, in an amount of 50% by mass or more relative to the mass of the oil phase.

[11] The composition according to any one of [1] to

[10] , wherein the lamellar gel phase further contains water.

[12] The composition according to any one of [1] to

[11] , wherein the content of the higher aliphatic alcohol or higher fatty acid is 1 mass % or less based on the total mass of the composition.

[13] The composition according to any one of [1] to

[12] , further comprising a moisturizer.

[14] The composition according to any one of [1] to

[13] , which is a cleansing composition.

[0007] According to the present invention, there is provided an oil-in-water type composition having excellent stability over time, cleaning power, and rinsing speed.

[0008] The oil-in-water composition according to the present invention (hereinafter, sometimes referred to as "the composition") comprises a lamellar gel phase containing a combination of a first, a second and a third nonionic surfactant; An oil phase containing 10% by mass to 50% by mass of an ester oil; and an aqueous phase. Each component will be described below.

[0009] The term "lamellar gel phase" refers to a gel-like substance formed by an association of lamellar bilayers formed by hydrophilic surfactants in the presence of water. Generally, however, a gel that is an association formed by higher aliphatic alcohols and hydrophilic surfactants in water and has an α-type structure (Fukushima Shoji, "Physical Chemistry of Cetyl Alcohol," Fragrance Journal Co., Ltd.) is called a lamellar gel.

[0010] The formation of the lamellar gel phase can be confirmed by analyzing the X-ray scattering pattern. For example, multiple peaks corresponding to the long spacing are obtained in the small angle region, and the wide angle region (scattering vector q = 1.5 nm) is not observed. -1 When a sharp single peak is obtained in the measurement of the viscosity of the solution, it can be determined that a lamellar gel phase is formed.

[0011] <Combination of nonionic surfactants> The composition according to the present invention comprises a combination of a first, a second and a third nonionic surfactant.

[0012] (I) First Nonionic Surfactant The first nonionic surfactant used in the present invention is represented by the formula (1): [ka] (In the formula, R 1a each independently represents a linear acyl group or a linear alkyl group having 16 to 24 carbon atoms, R 1b is an alkylene group having 2 to 4 carbon atoms, n1b is an integer from 4 to 15. It is expressed as follows.

[0013] Of these, R 1a is preferably a linear acyl group or linear alkyl group having 16 to 20 carbon atoms, R 1b is preferably an alkylene group having 2 to 3 carbon atoms, and more preferably an ethylene group; It is preferable that n1b is 4 to 8.

[0014] Examples of the first nonionic surfactant include polyoxyethylene (4 mol) distearate (e.g., Nippon Emulsion Co., Ltd., Emalex 200DIS), polyoxyethylene (6 mol) distearate (e.g., Nippon Emulsion Co., Ltd., Emalex 300DIS), polyoxyethylene (8 mol) distearate (e.g., Nippon Emulsion Co., Ltd., Emalex 400DIS), polyoxyethylene (12 mol) distearate (e.g., Nippon Emulsion Co., Ltd., Emalex 600DIS), steareth-4 stearate (e.g., Nippon Emulsion Co., Ltd., Emalex SWS-4), steareth-6 stearate (e.g., Nippon Emulsion Co., Ltd., Emalex SWS-6), steareth-9 stearate (e.g., Nippon Emulsion Co., Ltd., Emalex SWS-9), and polyoxyethylene (8 mol) dibehenyl ether. The bonding form between the polyoxyethylene chain and the alkyl group may be an ester or an ether, or may include both.

[0015] Among such first nonionic surfactants, polyoxyethylene (4 mol) distearate, polyoxyethylene (6 mol) distearate, and polyoxyethylene (8 mol) distearate are preferred. These are polyethylene glycol distearates having n1b of 4 to 8.

[0016] (II) A second nonionic surfactant The second nonionic surfactant used in the present invention is first selected from those having an HLB of 7 to 15. Here, in the present invention, it is preferable to use one in which the HLB is calculated by the Davis method.

[0017] Furthermore, the second nonionic surfactant used in the present invention is represented by any one of formulas (2-1) to (2-3).

[0018] [ka] (In the formula, R2a is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R 2b is an alkylene group having 2 to 4 carbon atoms, n2b is an integer between 5 and 20.

[0019] Examples of the second nonionic surfactant represented by (2-1) include polyoxyethylene (20 mol) behenyl ether (e.g., Nikkol BB-20, manufactured by Nikko Chemicals Co., Ltd.), polyoxyethylene (10 mol) stearyl ether (e.g., Emalex 610, manufactured by Nippon Emulsion Co., Ltd.), and polyoxyethylene (7 mol) cetyl ether (e.g., Emalex 107, manufactured by Nippon Emulsion Co., Ltd.).

[0020] [ka] (In the formula, R 2c is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R 2d each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2d is independently an integer of 1 or more, and the sum of all n2d is 5 to 20.

[0021] Examples of the second nonionic surfactant represented by (2-2) include polyoxyethylene (5 mol) glyceryl monostearate (e.g., Emalex GM-5, manufactured by Nippon Emulsion Co., Ltd.), polyoxyethylene (10 mol) glyceryl monostearate (e.g., Emalex GM-10, manufactured by Nippon Emulsion Co., Ltd.), and the like.

[0022] [ka] (In the formula, R 2e each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2e is independently an integer of 1 or more, and the sum of all n2d is 5 to 30; R 2f is a straight-chain acyl group or straight-chain alkyl group having 16 to 24 carbon atoms.

[0023] Examples of the second nonionic surfactant represented by (2-3) include polyoxyethylene (20 mol) sorbitan monostearate (for example, Nikkol TS-10V, manufactured by Nikko Chemicals Co., Ltd.).

[0024] (III) A third nonionic surfactant A third nonionic surfactant used in the present invention has an HLB value of 6 to 19 and is represented by formula (3-1). [ka] (In the formula, R 3a each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3a is independently an integer of 1 or more, and the sum of the three n3a is 8 to 90; R 3b are each independently a hydrogen atom or an acyl or alkyl group having 16 to 24 carbon atoms; R 3b At least one of these is not hydrogen.

[0025] Examples of the surfactant having an HLB of 6 to 19 and represented by formula (3-1) include PEG-8 glyceryl isostearate (e.g., EMALEX GWIS-108, manufactured by Nippon Emulsion Co., Ltd.), PEG-20 glyceryl isostearate (e.g., EMALEX GWIS-120, manufactured by Nippon Emulsion Co., Ltd.), and polyoxyethylene (20 mol) glyceryl triisostearate (e.g., Nikkol TGI-20, manufactured by Nikko Chemicals Co., Ltd.).

[0026] The third nonionic surfactant used in the present invention has an HLB value of 7 to 15 and is represented by the formula (3-2). [ka] (In the formula, R 3c each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3c is independently an integer of 1 or more, and the sum of the three n3c's is 10 to 100; R 3d each independently represents an alkylene group having 8 to 12 carbon atoms, R 3e are each independently an alkyl group having 4 to 8 carbon atoms, R 3f are each independently a polymer of 12-hydroxystearic acid or a polymer of alkylene polyol).

[0027] Examples of the second nonionic surfactant having an HLB of 7 to 15 and represented by formula (3-2) include polyoxyethylene (20 mol) hydrogenated castor oil fatty acid glyceryl (e.g., Nikkol HCO-20, manufactured by Nikko Chemicals Co., Ltd.) and polyoxyethylene (60 mol) hydrogenated castor oil fatty acid glyceryl (e.g., Nikkol HCO-60, manufactured by Nikko Chemicals Co., Ltd.).

[0028] In the composition according to the present invention, the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant preferably constitute at least a part of the lamellar gel phase. In order for these surfactants to form a good lamellar phase, it is preferable that each surfactant is blended at a specific content and each surfactant is blended at a specific ratio.

[0029] The content W1 of the first nonionic surfactant is 0.25 to 24% by mass, preferably 0.5 to 10% by mass, based on the total mass of the composition, the content W2 of the second nonionic surfactant is 0.5% to 6% by mass, preferably 1.8 to 3.6% by mass, based on the total mass of the composition, and the content W3 of the third nonionic surfactant is 1.0 to 25% by mass, more preferably 2.0 to 20% by mass, based on the total mass of the composition. If the content of each nonionic surfactant is too low, it may be difficult to form a stable gel with low molecular weight oily components, and if it is too high, it may become highly viscous and the feel when used may be poor, so care must be taken.

[0030] Furthermore, the ratio W1 / W2 of the content of the first nonionic surfactant to the content of the second nonionic surfactant is preferably 0.4 to 4, and the ratio W3 / W2 of the content of the third nonionic surfactant to the content of the second nonionic surfactant is preferably 1 to 14. If these ratios are outside the above ranges, it may be difficult to form a stable gel, so care must be taken.

[0031] The total content WA of the first, second and third nonionic surfactants is preferably 2.5 to 30 mass %, and more preferably 5 to 15 mass %, based on the mass of the composition. By lowering the total content of the nonionic surfactants, it is possible to reduce irritation to the skin, while by increasing it, it is possible to improve the stability and cleaning power of the composition.

[0032] The HLB weighted average of the first, second and third nonionic surfactants is preferably 6 to 10. The HLB weighted average can be calculated from the mass ratio of the first nonionic surfactant to the second nonionic surfactant. For example, when the HLBs of the first, second and third nonionic surfactants are A, B and C, respectively, and the mass ratio of the respective nonionic surfactants is a:b:c, the HLB weighted average can be calculated as (a×A+b×B+c×C) / (a+b+c).

[0033] <Water> The composition according to the present invention may further contain water. As the water, water used in cosmetics, quasi-drugs, etc., such as purified water, ion-exchanged water, tap water, etc., may be used.

[0034] The water content is preferably 50% by mass or less, more preferably 30% by mass or less, based on the mass of the composition, where the water content includes not only the water in the aqueous phase but also the water contained in the lamellar gel phase.

[0035] <Oil phase> The oil phase contained in the composition according to the present invention is emulsified in the lamellar gel phase. In the present invention, the oil phase contains an ester oil.

[0036] Examples of the ester oils that can be used in the present invention include isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoate glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate Examples of suitable glyceryl esters include lauroyl undecyl, diisobutyl adipate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0037] In addition, the oil phase preferably contains an oily component having a molecular weight of 400 or less. Here, the oily component having a molecular weight of 400 or less may be the above-mentioned ester oil or other oil. By including an oily component having a molecular weight of 400 or less, the cleaning ability for oily objects to be cleaned, such as make-up, can be improved. As the oily component having a molecular weight of 400 or less, for example, at least one selected from the group consisting of tripropylene glycol dipivalate, isodecane, isononyl isononanoate, cetyl ethylhexanoate, ethyl isostearate, isobutyl isostearate, isodecyl neopentanoate, octyldodecyl neopentanoate, myristyl neopentanoate, and isostearyl neopentanoate can be mentioned.

[0038] The oil component having a molecular weight of 400 or less preferably accounts for, for example, 50% by mass or more relative to the mass of the oil phase.

[0039] The oil phase is preferably liquid at atmospheric pressure and 25° C. By emulsifying the oil phase in a lamellar gel phase, the emulsion stability can be increased.

[0040] When emulsified, the average particle size of the oil phase is preferably 0.5 μm or more. The average particle size of the oil phase can be, for example, 1 μm or more. The average particle size of the oil phase is preferably 20 μm or less. The average particle size of the oil phase can be, for example, 15 μm or less, 10 μm or less, or 5 μm or less.

[0041] The oil phase may contain an oil component other than the ester oil, and is not particularly limited, and for example, liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, etc. may be appropriately blended.

[0042] The content of the oil phase (oil component) is preferably 50% by mass or more, more preferably 70% by mass or more, based on the mass of the oil-in-water composition. In general, if the oil phase exceeds 80% by mass, the emulsion stability tends to decrease, so care must be taken.

[0043] In the composition according to the present invention, the lamellar gel phase can be constructed only by a nonionic surfactant. As a method for forming a lamellar gel phase, a method using a higher aliphatic alcohol or a higher fatty acid is also known, but in the composition according to the present invention, the content of the higher aliphatic alcohol or higher fatty acid used to construct the lamellar gel phase is preferably 1% by mass or less based on the total mass of the oil-in-water composition. The oil-in-water composition according to the present invention may be substantially free of higher aliphatic alcohol or higher fatty acid. If the composition contains more than 1% by mass of the higher aliphatic alcohol or higher fatty acid that constitutes the lamellar gel phase, care should be taken because the user may feel sticky when applying it to the skin.

[0044] <Other ingredients> The oil-in-water composition according to the present invention may contain other ingredients, such as moisturizers, water-soluble alcohols, powders, anionic surfactants, cationic surfactants, amphoteric surfactants, hydrophilic nonionic surfactants, lipophilic nonionic surfactants, water-soluble polymers, thickeners, film-forming agents, oil-soluble UV absorbers, water-soluble UV absorbers, sequestering agents, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant assistants, fragrances, and the like, as necessary, within the scope that does not impair the effects of the present invention.

[0045] Among these other components, the composition according to the present invention preferably contains a moisturizing agent, such as polyethylene glycol, propylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, alkylene oxide derivatives, short-chain soluble collagen, diglycerin (EO)PO adducts, Rosa robur extract, Achillea millefolium extract, and Melilot extract.

[0046] <Method of producing oil-in-water composition> The method for producing the composition according to the present invention includes a step of producing a lamellar gel phase using a nonionic surfactant. Specifically, the step of producing a lamellar gel phase can include a step of heating and melting the above-mentioned nonionic surfactant, and a step of adding water to the melted nonionic surfactant and stirring the mixture. The nonionic surfactant can be melted at, for example, 70°C to 80°C. The water to be added is preferably heated to the same degree as the nonionic surfactant (for example, 70°C to 80°C; for example, ±15°C). The lamellar gel phase can be obtained by adding water and then cooling. When the nonionic surfactant is a mixture, a mixture of the first, second, and third nonionic surfactants can be heated and melted.

[0047] The method for producing the oil-in-water composition according to the present invention can include, for example, a step of emulsifying an oily component in a lamellar gel phase, and a step of adding an aqueous component after emulsification. The step of emulsifying an oily component can include, for example, a step of preparing a solution in which a nonionic surfactant is dissolved in a polyhydric alcohol (e.g., dipropylene glycol, 1,3-butylene glycol), and a step of emulsifying while adding an oily component to the solution. For example, the oil-in-water composition according to the present invention can be produced using a non-aqueous emulsification method (D-phase emulsification method). By using a non-aqueous emulsification method, the emulsion particles can be made finer. In addition, the lamellar gel phase can be adsorbed to the oil-water interface.

[0048] In the present invention, the lamellar gel phase can be constructed with a nonionic surfactant without using a higher aliphatic alcohol or a higher fatty acid. This allows the user to obtain a refreshing feeling when applying the lamellar gel phase to the skin without feeling sticky as with a lamellar gel phase using a higher aliphatic alcohol or a higher fatty acid. In particular, since it is believed that a large amount of aqueous components are not taken into the spaces between the lamellae, the lamellar gel phase can be quickly absorbed into the skin during application and has excellent moisturizing effect on the skin after application.

[0049] The oil-in-water composition according to the present invention can have a lamellar gel phase constituted as a single-phase self-organized body. Since the oil-in-water composition according to the present invention is formed only from polyoxyethylene-based nonionic surfactants having similar properties, it is possible to suppress the formation of a mixture of two phases, a lamellar gel phase and crystals. This makes it possible to suppress the occurrence of problems with stability over time, such as crystal precipitation and viscosity increase, in the oil-in-water composition according to the present invention.

[0050] The lamellar gel phase formed from the first, second and third nonionic surfactants in the composition according to the present invention has a higher eutectic point and melting enthalpy than a lamellar gel phase formed from a single nonionic surfactant selected from the group consisting of the second nonionic surfactant and the third nonionic surfactant. The high eutectic point and melting enthalpy can increase the stability at high temperatures.

[0051] The oil-in-water composition according to the present invention is more stable and absorbs more quickly into the skin than an oil-in-water composition emulsified in a lamellar gel phase formed using a higher aliphatic alcohol or a higher fatty acid without using a combination of non-surfactants.

[0052] The lamellar gel phase of the present invention has low solubility in oily components having a molecular weight of 400 or less and highly polar oily components. This allows high emulsion stability to be maintained even when low molecular weight oils and highly polar oils that cannot be emulsified in a lamellar gel phase using a higher aliphatic alcohol or a higher fatty acid are emulsified. This allows a large amount of low molecular weight oily components with high cleansing effect to be blended, and the oil-in-water composition of the present invention can provide high cleansing properties for oily components to be washed, such as makeup.

[0053] The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples. Contents are expressed in mass % unless otherwise specified.

[0054] [Examples 1 to 15 and Comparative Examples 1 to 9] The cleaning agents were prepared by mixing the ingredients according to the formulas shown in Tables 1-1 and 1-2, and their cleaning power and rinsing speed were evaluated using a Gakushin-type friction tester (manufactured by Yasuda Seiki Seisakusho Co., Ltd.). Each evaluation item was evaluated according to the following criteria.

[0055] Cleaning power A: Very high. B: It was quite expensive. C: It was expensive. D: It was a little expensive. E: It was a little low. F: It was low. G: It was very low.

[0056] Rinse speed A: It was very quick. B: It was quite early. C: It was quick. D: It was a little early. E: It was a little late. F: It was late. G: It was very slow.

[0057] In addition, for both cleaning power and rinsing speed, a rating of A to D can be considered to have reached an acceptable level of performance.

[0058] [Table 1-1]

[0059] [Table 1-2]

[0060] From the above results, it is found that a cleanser containing a specific component in a specific range has an excellent effect. It is also found that even if a part of the surfactant combination specified in the present invention is replaced with another surfactant as a nonionic surfactant, sufficient effect cannot be obtained (Comparative Example 5). It is also found that even if a specific surfactant combination is included, sufficient effect cannot be obtained if the content of each surfactant is not within a specific range.

[0061] [Examples 16 to 51] Cleansers were prepared by varying the type and content of the third nonionic surfactant, and were then evaluated. The composition of each cleanser and the evaluation results are shown in Tables 2-1 to 2-4.

[0062] [Table 2-1]

[0063] [Table 2-2]

[0064] [Table 2-3]

[0065] [Table 2-4]

[0066] These results demonstrate that excellent results can be obtained when a particular type of third surfactant is selected.

Claims

1. a lamellar gel phase comprising a combination of a first, a second and a third nonionic surfactant; an oil phase comprising an ester oil; and an aqueous phase, Where: (I) The first nonionic surfactant is represented by formula (1): 【Chemistry 1】 (In the formula, R １ａ each independently represents a linear acyl group or a linear alkyl group having 16 to 24 carbon atoms, R １ｂ is an alkylene group having 2 to 4 carbon atoms, n1b is an integer from 4 to 15. It is expressed by (II) The second nonionic surfactant has an HLB of 7 to 15 and is represented by the formulas (2-1) to (2-3): 【Chemistry 2】 (In the formula, R ２ａ is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R ２ｂ is an alkylene group having 2 to 4 carbon atoms, n2b is an integer from 5 to 20. 【Chemistry 3】 (In the formula, R ２ｃ is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms, R ２ｄ each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2d is independently an integer of 1 or more, and the sum of all n2d is 5 to 20. 【Chemistry 4】 (In the formula, R ２ｅ each independently represents an alkylene group having 2 to 4 carbon atoms, Each n2e is independently an integer of 1 or more, and the sum of all n2d is 5 to 30; R ２ｆ is a linear acyl group or linear alkyl group having 16 to 24 carbon atoms. It is expressed by either (III) The third nonionic surfactant has an HLB of 6 to 19 and is represented by the formula (3-1): 【Chemistry 5】 (In the formula, R ３ａ each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3a is independently an integer of 1 or more, and the sum of the three n3as is 8 to 90; R ３ｂ are each independently a hydrogen atom or an acyl or alkyl group having 16 to 24 carbon atoms; R ３ｂ At least one of these is not hydrogen. or HLB 7 to 15, and is represented by the formula (3-2): 【Chemistry 6】 (In the formula, R ３ｃ each independently represents an alkylene group having 2 to 4 carbon atoms, Each n3c is independently an integer of 1 or more, and the sum of the three n3c's is 10 to 100; R ３ｄ each independently represents an alkylene group having 8 to 12 carbon atoms, R ３ｅ are each independently an alkyl group having 4 to 8 carbon atoms, R ３ｆ are each independently a polymer of 12-hydroxystearic acid or a polymer of alkylene polyol). It is expressed by Based on the total mass of the oil-in-water composition, The content of the first nonionic surfactant is 0.25 to 24% by mass, The content of the second nonionic surfactant is 0.5 to 6.0% by mass, The content of the third nonionic surfactant is 1.0 to 25% by mass, The content of the oil phase is 10 to 70% by mass. Oil-in-water composition.

2. 2. The composition of claim 1, wherein the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant comprise at least a portion of the lamellar gel phase.

3. The composition of claim 1 or 2, wherein the oil phase is emulsified by the lamellar gel phase.

4. The composition according to claim 1 or 2, wherein the contents of the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant are, respectively, 0.5 to 10.0 mass %, 1.8 to 3.6 mass %, and 2.0 to 20 mass %, based on the total mass of the composition.

5. 3. The composition according to claim 1, wherein the ratio of the content of the first nonionic surfactant to the content of the second nonionic surfactant is from 0.4 to 4.

6. 3. The composition according to claim 1, wherein the ratio of the content of the third nonionic surfactant to the content of the second nonionic surfactant is 1 to 14.

7. 3. The composition of claim 1 or 2, wherein the first nonionic surfactant is polyethylene glycol distearate having an n1b of 4 to 8.

8. 3. The composition of claim 1 or 2, wherein the lamellar gel phase has a higher eutectic point and melting enthalpy than a lamellar gel phase formed with one nonionic surfactant alone, the nonionic surfactant being selected from the group consisting of a second nonionic surfactant and a third nonionic surfactant.

9. 3. The composition of claim 1 or 2, wherein the HLB weighted average of the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant is 6-10.

10. The composition according to claim 1 or 2, wherein the oil phase contains an oil component having a molecular weight of 400 or less in an amount of 50% by mass or more relative to the mass of the oil phase.

11. The composition of claim 1 or 2, wherein the lamellar gel phase further comprises water.

12. 3. The composition according to claim 1, wherein the content of higher aliphatic alcohol or higher fatty acid is 1% by mass or less based on the total mass of the composition.

13. The composition of claim 1 or 2, further comprising a moisturizer.

14. The composition according to claim 1 or 2, which is a cleansing composition.

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