Oil-in-water composition

Abstract

[Problem] To provide an oil-in-water composition having excellent long-term stability, cleaning power, and flushing speed. [Solution] An oil-in-water type composition comprising: a layered gel phase comprising a combination of a first nonionic surfactant, a second nonionic surfactant, and a third nonionic surfactant; an oil phase comprising an ester oil; and an aqueous phase. The first nonionic surfactant has hydrophobic parts on both sides of the hydrophilic part, the second nonionic surfactant has a hydrophilic part at the terminal, and the third nonionic surfactant is a glyceride or the like.

Description

Technical Field

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

[0002] In the past, in order to maintain the emulsification stability of skin external preparations such as cosmetics, quasi-drugs, and medicines, skin external preparations containing lamellar gels have been used, in which lamellar gels (α gels) formed by higher fatty alcohols, higher fatty acids, and hydrophilic surfactants are used. For example, low-viscosity and low-molecular-weight oily components are suitable for cleaning materials for cleaning color cosmetics, but low-molecular-weight oily components have the characteristic of being easy to dissolve surfactants. Therefore, in the case of emulsifying low-molecular-weight oily components in water-in-oil compositions, the stability is sometimes insufficient.

[0003] Therefore, studies have been conducted on the use of a layered gel composition that can contain an oil component at a high content and has high emulsification stability (for example, Patent Document 1).

[0004] However, according to the research of the present inventors, it was found that there is still room for improvement in the cleaning power and rinsing speed of the composition containing the lamellar gel. Therefore, it is required to improve the cleaning power and rinsing speed of the conventionally known composition using the lamellar gel.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: International Patent Publication No. 2023 / 042687 Summary of the invention

[0008] According to the present invention, the following inventions are provided.

[0009] [1] An oil-in-water composition comprising:

[0010] a lamellar gel phase comprising a combination of a first nonionic surfactant, a second nonionic surfactant, and a third nonionic surfactant;

[0011] an oil phase comprising 10% to 50% by mass of an ester oil; and

[0012] Water phase,

[0013] in,

[0014] (I) The first nonionic surfactant is represented by formula (1),

[0015]

[0016] R 1a are each independently a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms,

[0017] R 1b is an alkylene group having 2 to 4 carbon atoms,

[0018] n1b is an integer from 4 to 15)

[0019] (II) The second nonionic surfactant has an HLB of 7 to 15 and is represented by any of the formulas (2-1) to (2-3),

[0020]

[0021] (In formula (2-1),

[0022] R 2a is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms,

[0023] R 2b is an alkylene group having 2 to 4 carbon atoms,

[0024] n2b is an integer from 5 to 20)

[0025]

[0026] (In formula (2-2),

[0027] R 2c is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms,

[0028] R 2d are each independently an alkylene group having 2 to 4 carbon atoms,

[0029] n2d is independently an integer greater than 1, and the sum of all n2d is 5 to 20)

[0030]

[0031] (In formula (2-3),

[0032] R 2e are each independently an alkylene group having 2 to 4 carbon atoms,

[0033] Each n2e is independently an integer greater than 1, and the sum of all n2d is 5 to 30.

[0034] R 2f is a straight-chain acyl or straight-chain alkyl group having 16 to 24 carbon atoms)

[0035] (III) the third nonionic surfactant has an HLB of 6 to 19 and is represented by the formula (3-1) or the third nonionic surfactant has an HLB of 7 to 15 and is represented by the formula (3-2),

[0036]

[0037] (In formula (3-1),

[0038] R 3a are each independently an alkylene group having 2 to 4 carbon atoms,

[0039] n3a is independently an integer greater than 1, and the sum of the three n3a is 8 to 90.

[0040] R 3b are each independently hydrogen or an acyl or alkyl group having 16 to 24 carbon atoms, R 3b at least one of which is not hydrogen)

[0041]

[0042] (In formula (3-2),

[0043] R 3c are each independently an alkylene group having 2 to 4 carbon atoms,

[0044] Each of n3c is independently an integer greater than 1, and the sum of the three n3c is 10 to 100.

[0045] R 3d are each independently an alkylene group having 8 to 12 carbon atoms,

[0046] R 3e are each independently an alkyl group having 4 to 8 carbon atoms,

[0047] R 3f Each is independently a polymer of 12-hydroxystearic acid or a polymer of an alkylene polyol).

[0048] [2] The composition according to [1], wherein the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant constitute at least a part of the lamellar gel phase.

[0049] [3] The composition according to [1] or [2], wherein the oil phase is emulsified in the lamellar gel phase.

[0050] [4] The composition according to any one of [1] to [3], wherein the contents of the first nonionic surfactant, the second nonionic surfactant and the third nonionic surfactant are 0.5 to 10.0 mass %, 1.8 to 3.6 mass % and 2.0 to 20 mass %, respectively, based on the total mass of the composition.

[0051] [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.

[0052] [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.

[0053] [7] The composition according to any one of [1] to [6], wherein the first nonionic surfactant is polyethylene glycol distearate having n1b of 4 to 8.

[0054] [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 solely by one nonionic surfactant selected from the group consisting of a second nonionic surfactant and a third nonionic surfactant.

[0055] [9] The composition according to any one of [1] to [8], wherein the weighted average HLB of the first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant is 6 to 10.

[0056]

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

[0057]

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

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

[0058]

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

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

[0059]

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

[12] , further comprising a moisturizer.

[0060]

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

[13] , which is a cleaning composition.

[0061] According to the present invention, there is provided an oil-in-water composition having excellent stability over time, cleaning power and rinsing speed. DETAILED DESCRIPTION

[0062] The oil-in-water composition of the present invention (hereinafter, sometimes referred to as "composition") comprises:

[0063] a lamellar gel phase comprising a combination of a first nonionic surfactant, a second nonionic surfactant, and a third nonionic surfactant;

[0064] an oil phase comprising 10% to 50% by mass of an ester oil; and

[0065] Water phase.

[0066] Hereinafter, each component will be described.

[0067] It should be noted that the "lamellar gel phase" refers to a gel-like substance formed by an association of lamellar bimolecular membranes formed by a hydrophilic surfactant in the presence of water. Among them, generally speaking, a gel having an α-type structure ("Physical Chemistry of Cetyl Alcohol" edited by Shoji Fukushima, Fragrance Journal) is called a lamellar gel.

[0068] The formation of the lamellar gel phase can be confirmed by analysis of the X-ray scattering pattern. For example, if multiple peaks corresponding to the long interplanar spacing are obtained in the small angle region and in the wide angle region (scattering vector q = 1.5 nm), the formation of the lamellar gel phase can be confirmed by analysis of the X-ray scattering pattern. -1 ) obtains a sharp single peak, it can be judged that a lamellar gel phase is formed.

[0069] <Combination of nonionic surfactants>

[0070] The composition of the present invention comprises a combination of a first nonionic surfactant, a second nonionic surfactant, and a third nonionic surfactant.

[0071] (I) First nonionic surfactant

[0072] The first nonionic surfactant used in the present invention is represented by formula (1).

[0073]

[0074] (In formula (1), R 1a Each independently represents a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms, R 1b is an alkylene group having 2 to 4 carbon atoms,

[0075] n1b is an integer from 4 to 15).

[0076] Among them,

[0077] R 1a It is preferably a straight-chain acyl group or a straight-chain alkyl group having 16 to 20 carbon atoms,

[0078] R 1b It is preferably an alkylene group having 2 to 3 carbon atoms, more preferably an ethylene group,

[0079] n1b is preferably 4-8.

[0080] Examples of the first nonionic surfactant include polyoxyethylene (4 mol) distearate (e.g., Emalex 200DIS manufactured by NIHON EMULSION Co., Ltd.), polyoxyethylene (6 mol) distearate (e.g., Emalex 300DIS manufactured by NIHON EMULSION Co., Ltd.), polyoxyethylene (8 mol) distearate (e.g., Emalex 400DIS manufactured by NIHONE MULSION Co., Ltd.), polyoxyethylene (12 mol) distearate (e.g., Emalex 600DIS manufactured by NIHONE MULSION Co., Ltd.), steareth-4 stearate (e.g., Emalex SWS-4 manufactured by NIHON EMULSION Co., Ltd.), steareth-6 stearate (e.g., Emalex SWS-6 manufactured by NIHON EMULSION Co., Ltd.), and polyoxyethylene (12 mol) distearate (e.g., Emalex SWS-6 manufactured by NIHON EMULSION Co., Ltd.). SWS-6), steareth-9 stearate (e.g., Emalex SWS-9 manufactured by NIHON EMULSION Co., Ltd.), polyoxyethylene (8 mol) dibehenyl ether, etc. It should be noted that the bonding method between the polyoxyethylene chain and the alkyl group may be ester or ether, or may include both.

[0081] Among the 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 4-8.

[0082] (II) Second nonionic surfactant

[0083] The second nonionic surfactant used in the present invention is first selected from nonionic surfactants having an HLB of 7 to 15. Here, the HLB in the present invention is preferably calculated by the Davis method.

[0084] Furthermore, the second nonionic surfactant used in the present invention is represented by any of formulas (2-1) to (2-3).

[0085]

[0086] (In formula (2-1),

[0087] R 2a is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms,

[0088] R 2b is an alkylene group having 2 to 4 carbon atoms,

[0089] n2b is an integer from 5 to 20)

[0090] 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 NIHON EMULSION Co., Ltd.), and polyoxyethylene (7 mol) cetyl ether (e.g., Emalex 107 manufactured by NIHONE MULSION Co., Ltd.).

[0091]

[0092] (In formula (2-2),

[0093] R 2c is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms,

[0094] R 2d are each independently an alkylene group having 2 to 4 carbon atoms,

[0095] n2d is independently an integer greater than 1, and the sum of all n2d is 5 to 20)

[0096] Examples of the second nonionic surfactant represented by (2-2) include polyoxyethylene (5 mol) glyceryl monostearate (e.g., Emalex GM-5 manufactured by NIHON EMULSION Co., Ltd.), polyoxyethylene (10 mol) glyceryl monostearate (e.g., Emalex GM-10 manufactured by NIHON EMULSION Co., Ltd.), and the like.

[0097]

[0098] (In formula (2-3),

[0099] R 2e are each independently an alkylene group having 2 to 4 carbon atoms,

[0100] Each n2e is independently an integer greater than 1, and the sum of all n2d is 5 to 30.

[0101] R 2f is a straight-chain acyl or straight-chain alkyl group having 16 to 24 carbon atoms)

[0102] Examples of the second nonionic surfactant represented by (2-3) include polyoxyethylene (20 mol) sorbitan monostearate (eg, Nikkol TS-10V manufactured by Nikko Chemicals Co., Ltd.).

[0103] (III) Third nonionic surfactant

[0104] One of the third nonionic surfactants used in the present invention is a nonionic surfactant having an HLB of 6 to 19 and represented by formula (3-1).

[0105]

[0106] (In formula (3-1),

[0107] R 3a are each independently an alkylene group having 2 to 4 carbon atoms,

[0108] n3a is independently an integer greater than 1, the sum of the three n3a is 8 to 90, R 3b are each independently hydrogen or an acyl or alkyl group having 16 to 24 carbon atoms, R 3b at least one of which is not hydrogen)

[0109] Examples of the surfactant having an HLB of 6 to 19 and represented by the formula (3-1) include PEG-8 glyceryl isostearate (e.g., EMALEX GWIS-108 manufactured by NIHON EMULSION Co., Ltd.), PEG-20 glyceryl isostearate (e.g., EMALEX GWIS-120 manufactured by NIHON EMULSION Co., Ltd.), and polyoxyethylene (20 mol) glyceryl triisostearate (e.g., Nikkol TGI-20 manufactured by Nikko Chemicals Co., Ltd.).

[0110] The second third nonionic surfactant used in the present invention is a nonionic surfactant having an HLB of 7 to 15 and represented by formula (3-2).

[0111]

[0112] (In formula (3-2),

[0113] R 3c are each independently an alkylene group having 2 to 4 carbon atoms,

[0114] Each of n3c is independently an integer greater than 1, and the sum of the three n3c is 10 to 100.

[0115] R 3dare each independently an alkylene group having 8 to 12 carbon atoms,

[0116] R 3e are each independently an alkyl group having 4 to 8 carbon atoms,

[0117] R 3f Each is independently a polymer of 12-hydroxystearic acid or a polymer of an alkylene polyol).

[0118] 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 glyceride (e.g., Nikkol HCO-20 manufactured by Nikko Chemicals Co., Ltd.), polyoxyethylene (60 mol) hydrogenated castor oil glyceride (e.g., Nikkol HCO-60 manufactured by Nikko Chemicals Co., Ltd.), and the like.

[0119] In the composition of 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 to form a good lamellar phase, it is preferred that each of these surfactants is blended at a specific content and each surfactant is blended at a specific ratio.

[0120] The content W1 of the first nonionic surfactant is 0.25 to 24% by mass, preferably 0.5 to 10% by mass, relative to 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, relative to 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, relative to the total mass of the composition. When the content of each nonionic surfactant is too low, it becomes difficult to form a gel that is stable to low molecular weight oily components, and when it is too high, the viscosity becomes high and the feel during use may deteriorate, so care should be taken.

[0121] In addition, 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 out of the above ranges, it becomes difficult to form a stable gel, so care must be taken.

[0122] The total content WA of the first, second and third nonionic surfactants is preferably 2.5 to 30% by mass, more preferably 5 to 15% by mass, relative to the mass of the composition. By reducing the total content of nonionic surfactants, irritation to the skin can be reduced, and by increasing the total content, the stability and cleaning power of the composition can be improved.

[0123] The weighted average HLB of the first, second and third nonionic surfactants is preferably 6 to 10. The weighted average HLB can be calculated from the mass ratio of the first nonionic surfactant to the second nonionic surfactant. For example, when the HLB of the first, second and third nonionic surfactants are A, B and C, respectively, and the mass ratio of each nonionic surfactant is a:b:c, the weighted average HLB can be calculated by (a×A+b×B+c×C) / (a+b+c).

[0124] <Water>

[0125] The composition of the present invention may further contain water. As the water, water used in cosmetics, quasi-drugs, etc. can be used, for example, purified water, ion-exchanged water, tap water, etc. can be used.

[0126] The water content is preferably 50% by mass or less, more preferably 30% by mass or less, based on the mass of the composition. Here, the water content includes not only water in the aqueous phase but also water contained in the lamellar gel phase.

[0127] <Oil phase>

[0128] The oil phase contained in the composition of the present invention is emulsified using a lamellar gel phase. The oil phase in the present invention contains an ester oil.

[0129] As for the ester oil which can be used in the present invention, examples of the ester oil include isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate, acetylated lanolin, isocetyl stearate, isocetyl isostearate, cholesterol 12-hydroxystearate, ethylene glycol di(2-ethylhexanoate), dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di(2-heptylundecanoate), trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate Acid ester, pentaerythritol tetra (ethylhexanoate), glyceryl tri (ethylhexanoate), glyceryl tricaprylate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl alcohol 2-ethylhexanoate, ethylhexyl palmitate, glyceryl trimyristate, glyceryl tri (2-heptyl undecanoate), ricinoleic acid methyl ester, oleyl oleate, acetylated glyceryl, 2-heptyl undecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamate-2-octyldodecyl ester, di (heptyl undecyl alcohol) adipate, ethyl laurate, diethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, etc.

[0130] In addition, the oil phase preferably contains an oily component with a molecular weight of 400 or less. The oily component with a molecular weight of 400 or less here may be the above-mentioned ester oil or an oil component other than this. By containing an oily component with a molecular weight of 400 or less, the cleaning property for oily objects to be cleaned such as makeup can be improved. As the oily component with a molecular weight of 400 or less, for example, at least one selected from the group consisting of tripropylene glycol dineopentanoate, isodecane, isononyl isononanoate, cetyl ethylhexanoate, ethyl isostearate, isostearate isobutyl, isodecyl neopentanoate, octyldodecyl neopentanoate, myristyl neopentanoate and isostearyl neopentanoate can be cited.

[0131] The oily component having a molecular weight of 400 or less is preferably 50% by mass or more based on the mass of the oil phase, for example.

[0132] The oil phase is preferably in a liquid state at atmospheric pressure and 25° C. The oil phase is emulsified by the lamellar gel phase, thereby improving the emulsion stability.

[0133] During emulsification, the average particle size of the oil phase is preferably 0.5 μm or more. The average particle size of the oil phase may 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 may be, for example, 15 μm or less, 10 μm or less, or 5 μm or less.

[0134] The oil phase may contain oil components other than ester oils, and is not particularly limited, and for example, liquid oils, solid oils, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, etc. may be appropriately blended.

[0135] The content of the oil phase (oily component) is preferably 50% by mass or more, more preferably 70% by mass or more, relative to the mass of the oil-in-water composition. Generally, if the oil phase exceeds 80% by mass, emulsion stability tends to decrease, so care should be taken.

[0136] In the composition of the present invention, the lamellar gel phase may be constituted by only a nonionic surfactant. As a method for forming a lamellar gel phase, a method using a higher fatty alcohol or a higher fatty acid is also known, but in the composition of the present invention, the content of the higher fatty alcohol or the higher fatty acid used to constitute the lamellar gel phase is preferably 1% by mass or less relative to the total mass of the oil-in-water composition. The oil-in-water composition of the present invention may also contain substantially no higher fatty alcohol or higher fatty acid. When the composition contains more than 1% by mass of the higher fatty alcohol or the higher fatty acid constituting the lamellar gel phase, the user may sometimes feel sticky when applying it on the skin, so it is necessary to pay attention.

[0137] <Other ingredients>

[0138] The oil-in-water composition of the present invention may contain other ingredients as needed, such as humectants, water-soluble alcohols, powders, anionic surfactants, cationic surfactants, amphoteric surfactants, hydrophilic nonionic surfactants, lipophilic nonionic surfactants, water-soluble polymers, thickeners, coating agents, oil-soluble ultraviolet absorbers, water-soluble ultraviolet absorbers, screening agents, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, edible flavors, etc., within the range that does not impair the effects of the present invention.

[0139] Among these other ingredients, the composition of the present invention preferably contains a moisturizer. Examples of moisturizers include polyethylene glycol, propylene glycol, glycerol, 1,3-butylene glycol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, sulfated mucopolysaccharide, caronnic acid, atelocollagen, cholesterol-12-hydroxystearate, sodium lactate, bile acid salts, dl-pyrrolidone carboxylate, alkylene oxide derivatives, short-chain soluble collagen, diglycerol (EO) PO adducts, roxburghii fruit extract, yarrow extract, and sweet clover extract.

[0140] <Method for producing oil-in-water composition>

[0141] The method for producing the composition of the present invention includes the step of producing a lamellar gel phase using a nonionic surfactant. Specifically, the step of producing a lamellar gel phase may include the step of heating and melting the above-mentioned nonionic surfactant and the step of adding water to the melted nonionic surfactant and stirring. The nonionic surfactant may be melted, for example, at 70°C to 80°C. The added water is preferably heated to the same degree as the nonionic surfactant (e.g., 70°C to 80°C; e.g., ±15°C). The lamellar gel phase can be obtained by cooling after adding water. When the nonionic surfactant is a mixture, the mixture of the first nonionic surfactant, the second nonionic surfactant and the third nonionic surfactant may be heated and melted.

[0142] The method for producing the water-in-oil type composition of the present invention may include a step of emulsifying the oily component using, for example, a lamellar gel phase and a step of adding an aqueous component after emulsification. The step of emulsifying the oily component may include a step of preparing, for example, a solution of a nonionic surfactant dissolved in a polyol (e.g., dipropylene glycol, 1,3-butylene glycol) and a step of emulsifying while adding the oily component to the solution. For example, the water-in-oil type composition of the present invention may be produced using a non-aqueous emulsification method (D-phase emulsification method). By using a non-aqueous emulsification method, the emulsified particles can be made finer. In addition, the lamellar gel phase can be adsorbed on the oil-water interface.

[0143] In the present invention, the lamellar gel phase can be formed by a nonionic surfactant without using a higher fatty alcohol or a higher fatty acid. Therefore, when the lamellar gel phase is applied to the skin, the user does not feel sticky as in the case of a lamellar gel phase using a higher fatty alcohol or a higher fatty acid, and can obtain a refreshing feeling of use. In particular, since it is believed that a large amount of aqueous components are not absorbed between the lamellar surfaces, the lamellar gel phase can be quickly absorbed by the skin when applied, and has an excellent moisturizing effect on the skin after application.

[0144] The oil-in-water composition of the present invention may have a lamellar gel phase that is a self-organized body of a single phase. The oil-in-water composition of the present invention is formed only by a polyoxyethylene-based nonionic surfactant of similar properties, and therefore, the formation of a two-phase mixture of a lamellar gel phase and crystals can be suppressed. Thus, in the oil-in-water composition of the present invention, the problems of stability over time such as crystal precipitation and viscosity increase can be suppressed.

[0145] The lamellar gel phase contained in the composition of the present invention, which is formed by the first nonionic surfactant, the second nonionic surfactant and the third nonionic surfactant, has a higher eutectic point and melting enthalpy than a lamellar gel phase formed by one nonionic surfactant selected from the group consisting of the second nonionic surfactant and the third nonionic surfactant alone. The high eutectic point and melting enthalpy can improve the stability to high temperatures.

[0146] Compared with an oil-in-water composition obtained by emulsifying in a lamellar gel phase formed with a higher fatty alcohol or a higher fatty acid without using a non-surfactant, the oil-in-water composition of the present invention has high stability and is absorbed by the skin at a faster rate.

[0147] The lamellar gel of the present invention has low solubility for oily components with a molecular weight of 400 or less and oily components with high polarity. Therefore, even when emulsifying low molecular weight oils and high polarity oils that cannot be emulsified in the lamellar gel phase using higher fatty alcohols or higher fatty acids, high emulsion stability can be maintained. Therefore, a large amount of low molecular weight oily components with high cleaning effect can be formulated, and the oil-in-water composition of the present invention can obtain high cleaning properties for oily components to be cleaned, such as makeup.

[0148] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. The content is expressed in mass % unless otherwise specified.

[0149] [Examples 1 to 15 and Comparative Examples 1 to 9]

[0150] Cleaning materials were prepared by mixing the components in the ratios shown in Tables 1-1 and 1-2, and the cleaning power and rinsing speed were evaluated using a Gakushin friction tester (manufactured by Yasuda Seiki Co., Ltd.). It should be noted that each evaluation item was evaluated based on the following criteria.

[0151] Cleaning power

[0152] A: Very high.

[0153] B: Quite high.

[0154] C: High.

[0155] D: A bit high.

[0156] E: A bit low.

[0157] F: Low.

[0158] G: Very low.

[0159] Flushing speed

[0160] A: Very fast.

[0161] B: Pretty fast.

[0162] C: Fast.

[0163] D: A little fast.

[0164] E: A little slow.

[0165] F: Slow.

[0166] G: Very slowly.

[0167] In addition, if the evaluation is A to D in either the cleaning power or the rinsing speed, it can be determined that the performance has reached an acceptable level.

[0168] [Table 1-1]

[0169] Table 1-1

[0170]

[0171] [Table 1-2]

[0172] 1-2

[0173]

[0174] According to the above results, it can be seen that the cleaning material containing specific components in a specific range has an excellent effect. Moreover, as a nonionic surfactant, for the combination of specific surfactants in the present invention, even if a part of it is changed to other surfactants, sufficient effect cannot be obtained (Comparative Example 5). In addition, it can also be known that even if a combination of specific surfactants is included, when the content rate of each surfactant is not within a specific range, sufficient effect cannot be obtained.

[0175] [Examples 16 to 51]

[0176] Cleaning materials in which the type and content of the third nonionic surfactant were changed were prepared and evaluated. The composition and evaluation results of each cleaning material are shown in Tables 2-1 to 2-4.

[0177] [Table 2-1]

[0178] Table 2-1

[0179]

[0180] [Table 2-2]

[0181] Table 2-2

[0182]

[0183] [Table 2-3]

[0184] Table 2-3

[0185]

[0186] [Table 2-4]

[0187] Table 2-4

[0188]

[0189] These results show that when the third surfactant is selected from specific types, an excellent effect is obtained.

Claims

1. An oil-in-water composition comprising: a lamellar gel phase comprising a combination of a first nonionic surfactant, a second nonionic surfactant, and a third nonionic surfactant; an oil phase comprising an ester oil; and Water phase, in, (I) The first nonionic surfactant is represented by formula (1), In formula (1), R 1a are each independently a straight-chain acyl group or a straight-chain 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; (II) The second nonionic surfactant has an HLB of 7 to 15 and is represented by any of the formulas (2-1) to (2-3), In formula (2-1), R 2a is a straight-chain acyl group or a straight-chain 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, In formula (2-2), R 2c is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms, R 2d are each independently an alkylene group having 2 to 4 carbon atoms, Each n2d is independently an integer greater than 1, and the sum of all n2d is 5 to 20. In formula (2-3), R 2e are each independently an alkylene group having 2 to 4 carbon atoms, Each n2e is independently an integer greater than 1, and the sum of all n2d is 5 to 30. R 2f is a straight-chain acyl group or a straight-chain alkyl group having 16 to 24 carbon atoms; (III) the third nonionic surfactant has an HLB of 6 to 19 and is represented by the formula (3-1) or the third nonionic surfactant has an HLB of 7 to 15 and is represented by the formula (3-2), In formula (3-1), R 3a are each independently an alkylene group having 2 to 4 carbon atoms, n3a is independently an integer greater than 1, and the sum of the three n3a is 8 to 90. R 3b are each independently hydrogen or an acyl or alkyl group having 16 to 24 carbon atoms, R 3b At least one of is not hydrogen, In formula (3-2), R 3c are each independently an alkylene group having 2 to 4 carbon atoms, Each of n3c is independently an integer greater than 1, and the sum of the three n3c is 10 to 100. R 3d are each independently 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 each independently a polymer of 12-hydroxystearic acid or a polymer of an alkylene polyol, 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.

2. The composition according to claim 1, wherein The first nonionic surfactant, the second nonionic surfactant, and the third nonionic surfactant constitute at least a part of the lamellar gel phase.

3. The composition according to 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 0.5 to 10.0 mass %, 1.8 to 3.6 mass %, and 2.0 to 20 mass %, respectively, based on the total mass of the composition.

5. The composition according to claim 1 or 2, wherein The ratio of the content of the first nonionic surfactant to the content of the second nonionic surfactant is 0.4-4.

6. The composition according to claim 1 or 2, wherein The ratio of the content of the third nonionic surfactant to the content of the second nonionic surfactant is 1-14.

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

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

9. The composition according to claim 1 or 2, wherein The weighted average HLB 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 50% by mass or more of an oily component having a molecular weight of 400 or less, based on the mass of the oil phase.

11. The composition according to claim 1 or 2, wherein The lamellar gel phase also contains water.

12. The composition according to claim 1 or 2, wherein The content of the higher aliphatic alcohol or the higher fatty acid is 1% by mass or less based on the total mass of the composition.

13. The composition according to claim 1 or 2, further comprising a humectant.

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

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