Emulsion composition and method for producing same

Abstract

To provide a non-silicone emulsion composition that expresses a conditioning effect equivalent to or greater than a composition in which silicones are blended, and a method for producing the composition.SOLUTION: One embodiment of an emulsion composition 1 comprises a continuous phase 10, and a dispersion phase 20 dispersed in the continuous phase 10. The continuous phase 10 consists of a phase including chain alcohol having 16-22 carbon atoms and water. The dispersion phase 20 consists of oil droplets including triacylglycerol, alkane having 10-16 carbon atoms, ester of general formula (1) and ester of general formula (2): R1-C(=O)-O-R2 ...(1); and R3-C(=O)-O-R4 ...(2). In the formula (1), R1 denotes a branched-chain hydrocarbon group having 3-8 carbon atoms. R2 denotes an aliphatic hydrocarbon group having 12-18 carbon atoms. In the formula (2), R3 denotes an aliphatic hydrocarbon group having 11-21 carbon atoms. R4 denotes a polysaccharide structure polymerized by glycosidic linkage.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an emulsion composition and a method for producing the same. [Background technology]

[0002] A typical hair washing routine involves shampooing, followed by treatment with various hair treatment agents such as rinses, conditioners, and treatments to reduce damage to the hair and improve its feel. Hair treatment agents usually contain quaternary ammonium salts and higher alcohols, and further contain oils that impart various effects. Representative examples of such oils include silicones such as dimethyl silicone and modified silicone, which have a high conditioning effect of making hair smooth and moisturized after drying (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-70964 Summary of the Invention [Problem to be solved by the invention]

[0004] However, repeated use of a hair treatment agent containing silicones can lead to a build-up of silicones in the hair, making it difficult to obtain a good feel after washing and drying the hair.

[0005] In recent years, the price of silicon metal, the main raw material of silicone, has been rising due to a tightening of the global supply and demand caused by power restrictions in major producing areas. As a result, there are concerns about the impact on raw material prices and supply shortages of silicones in shampoos and hair treatments, and alternative technologies are being sought to address this issue. In addition, there is a demand for natural hair care products that use plant-derived ingredients because of their gentleness to hair, scalp and skin, and because of environmental considerations. There is a growing consumer need for products that contain a high percentage of natural ingredients.

[0006] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a non-silicone emulsion composition that exhibits a conditioning effect equal to or greater than that of a composition containing silicones, and a method for producing the same. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention employs the following configuration.

[0008] [1] An emulsion composition comprising a triacylglycerol, an alkane having 10 to 16 carbon atoms, an ester (1) represented by the following general formula (1), an ester (2) represented by the following general formula (2), a chain alcohol having 16 to 22 carbon atoms, and water. R 1 -C(=O)-OR 2 (1) R 3 -C(=O)-OR 4 (2) In formula (1), R 1 R represents a branched chain hydrocarbon group having 3 to 8 carbon atoms. 2 represents an aliphatic hydrocarbon group having 12 to 18 carbon atoms. In formula (2), R 3 R represents an aliphatic hydrocarbon group having 11 to 21 carbon atoms. 4 represents a polysaccharide structure polymerized through glycosidic bonds.

[0009] [2] The emulsion composition according to [1] above, comprising a continuous phase and a dispersed phase dispersed in the continuous phase, wherein the continuous phase is composed of a phase containing the chain alcohol and water, and the dispersed phase is composed of oil droplets containing triacylglycerol, the alkane, the ester (1) and the ester (2).

[0010] [3] The mixing ratio of triacylglycerol, the alkane, the ester (1), and the ester (2) is: The emulsion composition according to [1] or [2], wherein the mass ratio represented by (total content of triacylglycerol and the alkane) / (total content of the ester (1) and the ester (2)) is 0.3 to 8.

[0011] [4] A method for producing the emulsion composition according to [2] above, comprising: a step (P1) of mixing the chain alcohol and water with heating to prepare a mixed liquid Z; and a step (P2) of adding triacylglycerol, the alkane, the ester (1), and the ester (2) to the mixed liquid Z while mixing them to obtain an emulsion composition.

[0012] [5] The method for producing an emulsion composition according to [4] above, wherein in the step (P2), a mixed solution X of a triacylglycerol and the alkane, and a mixed solution Y of the ester (1) and the ester (2) are separately added to and mixed with the mixed solution Z to obtain an emulsion composition. Effect of the Invention

[0013] According to the present invention, it is possible to provide a non-silicone emulsion composition that exhibits a conditioning effect equal to or greater than that of a composition containing silicones, and a method for producing the same. [Brief description of the drawings]

[0014] [Figure 1] 1 is a microscopic image of the emulsion composition of Comparative Example 2. [Diagram 2] 1 is a microscopic image of the emulsion composition of Comparative Example 4. [Diagram 3] 1 is a microscopic image of the emulsion composition of Example 6. [Figure 4] 1 is a microscopic image of the emulsion composition of Example 7. [Diagram 5]1 is a microscopic image of the emulsion composition of Example 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] (Emulsified composition) An emulsion composition according to one embodiment of the present invention contains triacylglycerol, an alkane having 10 to 16 carbon atoms, an ester (1) represented by the following general formula (1), an ester (2) represented by the following general formula (2), a chain alcohol having 16 to 22 carbon atoms, and water, and may further contain other components as necessary.

[0016] R 1 -C(=O)-OR 2 (1) R 3 -C(=O)-OR 4 (2) In formula (1), R 1 R represents a branched chain hydrocarbon group having 3 to 8 carbon atoms. 2 represents an aliphatic hydrocarbon group having 12 to 18 carbon atoms. In formula (2), R 3 R represents an aliphatic hydrocarbon group having 11 to 21 carbon atoms. 4 represents a polysaccharide structure polymerized through glycosidic bonds.

[0017] The emulsion composition of the present embodiment is suitable for use in hair cosmetics and skin cosmetics, and is particularly suitable for use in hair cosmetics, and is useful for various hair treatment agents such as rinses, conditioners, and treatments. The emulsion composition of the present embodiment is particularly effective in cationic surfactant / higher alcohol-based in-bath hair treatment agents, but can also be used in leave-on type out-bath hair care products.

[0018] <Triacylglycerol> The triacylglycerol contained in the emulsion composition of the present embodiment is an acylglycerol in which three molecules of fatty acid are ester-bonded to one molecule of glycerol. The three fatty acid molecules may be the same or different. Each fatty acid here is preferably a fatty acid having 4 to 18 carbon atoms, more preferably a fatty acid having 6 to 12 carbon atoms (medium-chain fatty acid), and particularly preferably a fatty acid having 7 carbon atoms. Each fatty acid here may be a saturated fatty acid or an unsaturated fatty acid, and may be a straight-chain fatty acid or a branched-chain fatty acid. As the triacylglycerol, for example, trihexanoin, triheptanoin, trioctanoin, triethylhexanoin, and tridecanoin can be used, and among these, it is preferable to use triheptanoin.

[0019] The triacylglycerols can be used alone or in appropriate combination of two or more kinds. The content of triacylglycerol in the emulsion composition of this embodiment may be appropriately set depending on the application, dosage form, etc., and is, for example, 0.3 mass% or more and 6 mass% or less relative to the total mass (100 mass%) of the emulsion composition.

[0020] <Alkane with 10 to 16 carbon atoms> The alkane contained in the emulsion composition of the present embodiment is a saturated hydrocarbon having 10 to 16 carbon atoms. The alkane here includes not only chain saturated hydrocarbons but also cyclic saturated hydrocarbons. The alkane here is preferably an alkane having 11 to 16 carbon atoms, more preferably an alkane having 13 to 15 carbon atoms.

[0021] The alkanes having 10 to 16 carbon atoms may be used alone or in appropriate combination of two or more. Among them, the alkanes are preferably chain-like saturated hydrocarbons, and more preferably, alkanes containing a mixture of saturated hydrocarbons having different numbers of carbon atoms are used. The content of the alkane having 10 to 16 carbon atoms in the emulsion composition of this embodiment may be appropriately set depending on the application, dosage form, etc., and is, for example, 0.1 mass% or more and 3.6 mass% or less relative to the total mass (100 mass%) of the emulsion composition.

[0022] <Ester (1)> The ester (1) contained in the emulsion composition of the present embodiment is an ester represented by the following general formula (1).

[0023] R 1 -C(=O)-OR 2 (1) In formula (1), R 1 R represents a branched chain hydrocarbon group having 3 to 8 carbon atoms. 2 represents an aliphatic hydrocarbon group having 12 to 18 carbon atoms.

[0024] In the formula (1), R 1 The branched chain hydrocarbon group in has 3 to 8 carbon atoms, and preferably has 5 to 8 carbon atoms. Also, R 1 The branched hydrocarbon group in may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, and is preferably a saturated hydrocarbon group.

[0025] In the formula (1), R 2 The aliphatic hydrocarbon group in has 12 to 18 carbon atoms, preferably has 14 to 18 carbon atoms, and more preferably has 16 carbon atoms. Also, R 2 The aliphatic hydrocarbon group in may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, and is preferably a saturated hydrocarbon group. Also, R 2 The aliphatic hydrocarbon group in may be chain-like or cyclic, is preferably chain-like, and is more preferably straight-chain.

[0026] As the ester (1), for example, cetyl 2-ethylhexanoate, lauryl 2-ethylhexanoate, myristyl 2-ethylhexanoate, or stearyl 2-ethylhexanoate can be used, and among these, it is preferable to use cetyl 2-ethylhexanoate.

[0027] The ester (1) can be used alone or in appropriate combination of two or more kinds. The content of ester (1) in the emulsion composition of the present embodiment may be appropriately set depending on the application, dosage form, etc., and is, for example, 0.2 mass% or more and 6 mass% or less relative to the total mass (100 mass%) of the emulsion composition.

[0028] <Ester (2)> The ester (2) contained in the emulsion composition of the present embodiment is an ester represented by the following general formula (2).

[0029] R 3 -C(=O)-OR 4 (2) In formula (2), R 3 R represents an aliphatic hydrocarbon group having 11 to 21 carbon atoms. 4 represents a polysaccharide structure polymerized through glycosidic bonds.

[0030] In the formula (2), R 3 The aliphatic hydrocarbon group in has 11 to 21 carbon atoms, preferably has 13 to 17 carbon atoms, and more preferably has 15 carbon atoms. Also, R 3 The aliphatic hydrocarbon group in may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, and is preferably a saturated hydrocarbon group. Also, R 3 The aliphatic hydrocarbon group in may be chain-like or cyclic, is preferably chain-like, and is more preferably straight-chain.

[0031] In the formula (2), R 4The polysaccharide structure in is a structure polymerized by glycosidic bonds, and examples thereof include a dextrin structure, a maltose structure, a starch structure, an inulin structure, etc. Among these, the dextrin structure is preferred because it is likely to increase the adsorption to hair during hair washing. The dextrin structure referred to here is a molecular structure in which α-glucose is polymerized through α-(1→4) or α-(1→6) glycosidic bonds. Dextrin is classified as a polysaccharide and is intermediate between starch and maltose.

[0032] Examples of ester (2) that can be used include dextrin palmitate, dextrin (palmitate / ethylhexanoate), dextrin (palmitate / hexyldecanoate), dextrin isostearate, inulin myristate, and inulin stearate. Among these, it is preferable to use dextrin palmitate because it is easily adsorbed to hair during washing or because of its solubility.

[0033] In addition, (palmitic acid / ethylhexanoic acid) dextrin is an ester mixture (dextrin fatty acid ester) formed by dehydrating and condensing the carboxyl groups (-COOH) of palmitic acid and ethylhexanoic acid to the hydroxyl group (-OH) of dextrin. (Palmitic acid / hexyldecanoic acid) dextrin is an ester mixture (dextrin fatty acid ester) formed by dehydrating and condensing the carboxyl groups (-COOH) of palmitic acid and hexyldecanoic acid to the hydroxyl groups (-OH) of dextrin.

[0034] The ester (2) can be used alone or in appropriate combination of two or more kinds. The content of ester (2) in the emulsion composition of the present embodiment may be appropriately set depending on the application, dosage form, etc., and is, for example, 0.05 mass% or more and 1 mass% or less relative to the total mass (100 mass%) of the emulsion composition.

[0035] In the emulsion composition of this embodiment, the total content of the above-mentioned triacylglycerol and alkane having 10 to 16 carbon atoms is preferably 0.5% by mass or more and 9% by mass or less, more preferably 1% by mass or more and 8% by mass or less, and even more preferably 2% by mass or more and 6% by mass or less, relative to the total mass (100% by mass) of the emulsion composition.

[0036] In the emulsion composition of the present embodiment, the total content of the above-mentioned ester (1) and ester (2) is preferably from 0.5% by mass to 6% by mass, more preferably from 1% by mass to 4% by mass, and even more preferably from 1% by mass to 3% by mass, relative to the total mass (100% by mass) of the emulsion composition.

[0037] In the emulsion composition of the present embodiment, the total content of the above-mentioned triacylglycerol, alkane having 10 to 16 carbon atoms, ester (1), and ester (2) is preferably 1.5% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 12% by mass or less, and even more preferably 3% by mass or more and 9% by mass or less, relative to the total mass (100% by mass) of the emulsion composition. When the total content of these four components is equal to or greater than the lower limit of the preferred range, the conditioning effect is likely to be enhanced, whereas when the total content is equal to or less than the upper limit of the preferred range, stickiness is suppressed, and the feel after washing and drying the hair is likely to be improved.

[0038] In the emulsion composition of the present embodiment, the mixing ratio of the above-mentioned triacylglycerol, alkane having 10 to 16 carbon atoms, ester (1), and ester (2) is preferably 0.3 to 8, more preferably 0.5 to 6, and even more preferably 0.6 to 4, as expressed by the mass ratio (total content of triacylglycerol and the alkane) / (total content of the ester (1) and the ester (2)). When the mass ratio of these two components is equal to or more than the lower limit of the preferred range described above, the conditioning effect is easily enhanced, whereas when it is equal to or less than the upper limit of the preferred range described above, the storage stability of the emulsion composition is improved.

[0039] <Chain alcohol with 16 to 22 carbon atoms> The chain alcohol contained in the emulsion composition of the present embodiment is a chain alcohol having 16 to 22 carbon atoms, and is a base component that constitutes the continuous phase in the emulsion composition. The chain alcohol has 16 to 22 carbon atoms, preferably 16 to 20 carbon atoms, and more preferably 16 to 18 carbon atoms. Examples of the chain alcohol that can be used include cetanol (having 16 carbon atoms), stearyl alcohol (having 18 carbon atoms), cetostearyl alcohol (a mixture of cetanol and stearyl alcohol), and behenyl alcohol (having 22 carbon atoms). Of these, it is preferable to use cetanol, stearyl alcohol, and cetostearyl alcohol.

[0040] The chain alcohol having 16 to 22 carbon atoms can be used alone or in appropriate combination of two or more kinds. The content of the chain alcohol having 16 to 22 carbon atoms in the emulsion composition of this embodiment may be set appropriately depending on the application, dosage form, etc., and is preferably 1 to 5 mass %, and more preferably 2 to 4 mass %, relative to the total mass (100 mass %) of the emulsion composition.

[0041] <Water> The emulsion composition of the present embodiment contains water as a solvent. The content of water in the emulsion composition of the present embodiment is the remainder excluding triacylglycerol, the alkane having 10 to 16 carbon atoms, ester (1), ester (2), and the chain alcohol having 16 to 22 carbon atoms, as well as other components that are blended as necessary.

[0042] <Other ingredients> The emulsion composition of the present embodiment may contain other components as necessary in addition to the above-mentioned triacylglycerol, alkane having 10 to 16 carbon atoms, ester (1), ester (2), chain alcohol having 16 to 22 carbon atoms, and water. As other ingredients, ingredients that are blended in known cosmetics for hair or cosmetics for skin, etc. can be appropriately used within the scope of not impairing the effects of the present invention. Such other ingredients include, for example, cationic surfactants, nonionic surfactants, liquid oils and fats, solid oils and fats, waxes, alcohols having less than 16 carbon atoms, thickeners, pH adjusters, chelating agents, preservatives, polymer emulsions, fragrances, diglucosyl gallic acid or salts thereof, and various appealing ingredients.

[0043] Examples of cationic surfactants include quaternary ammonium salts, guanidine salts, and amidoamine surfactants. Examples of nonionic surfactants include glycerin fatty acid esters, sorbitan fatty acid esters, propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, sucrose fatty acid esters, polyglycerin fatty acid esters, alkyl polyoxyethylene sorbitan fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl or alkenyl ethers, and polyoxyethylene sorbit tetraoleate.

[0044] Examples of liquid oils and fats include vegetable oils such as coconut oil, camellia oil, macadamia nut oil, sunflower oil, almond oil, and olive oil; hydrocarbon oils such as squalane and liquid paraffin; polyhydric alcohol fatty acid esters such as propylene glycol dicaprylate and triethylhexanoin; fatty acid esters such as isopropyl palmitate and octyldodecyl myristate; and silicone oils such as cyclomethicone and dimethicone.

[0045] Examples of waxes include paraffin wax, ceresin, microcrystalline wax, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ivory wax, whale wax, montan wax, rice bran wax, lanolin, sugarcane wax, jojoba wax, hard lanolin, shellac wax, and wood wax.

[0046] The emulsion composition of the present embodiment may further contain diglucosyl gallic acid or a salt thereof, if necessary. By further containing diglucosyl gallic acid or a salt thereof, the conditioning effect is likely to be further enhanced.

[0047] [Oil-in-water (O / W) emulsion] The emulsion composition of the present embodiment is typically an oil-in-water (O / W type) emulsion in which oil droplets are dispersed in an aqueous phase (continuous phase). FIG. 4 is a microscopic image of an emulsion composition according to one embodiment of the present invention (corresponding to Example 7 described below). The emulsion composition 1 shown in FIG. 4 is an oil-in-water (O / W) emulsion comprising a continuous phase 10 and a dispersed phase 20 dispersed in the continuous phase 10. The continuous phase 10 consists of a phase containing a chain alcohol having 16 to 22 carbon atoms and water. Dispersed phase 20 consists of oil droplets containing triacylglycerol, an alkane having 10 to 16 carbon atoms, ester (1) and ester (2).

[0048] The shape of the particles constituting the oil droplets is, for example, spherical to elliptical, and the closer to spherical the shape the more preferable since the conditioning effect is likely to be enhanced.

[0049] The particle diameter of the particles constituting the oil droplets is, for example, in the range of 3 μm to 200 μm, and preferably in the range of 10 μm to 200 μm. In addition, since the conditioning effect is more easily enhanced, it is more preferable that the particles constituting the oil droplets have a particle diameter in the range of 10 μm to 70 μm, for example, more than half of the total number of particles have a particle diameter in the range of 10 μm to 70 μm. Here, the particle diameter of the particles constituting the oil droplet is the average value of the major axis of 50 or more particles observed in the photograph based on the scale bar (10.0 μm) at the bottom right of the observation image. The photograph used to measure the major axis of the particle is selected from several photographs taken.

[0050] The emulsion composition of the present embodiment described above contains triacylglycerol, an alkane having 10 to 16 carbon atoms, ester (1), ester (2), a chain alcohol having 16 to 22 carbon atoms, and water to form an emulsion. In such an emulsion composition, oil droplets containing a combination of two or more of triacylglycerol, an alkane having 10 to 16 carbon atoms, ester (1), and ester (2) can be dispersed in a continuous phase consisting of a phase containing the chain alcohol and water. It is presumed that the oil droplets are adsorbed to the hair during washing, thereby exerting a conditioning effect equal to or greater than that of a composition containing silicones.

[0051] The emulsion composition of the present embodiment is a silicone-free composition, and is a useful preparation that can cope with the recent rise in raw material prices and supply shortages related to silicones. In addition, the emulsion composition of the present embodiment can increase the content of natural ingredients in the composition.

[0052] (Method of producing emulsion composition) The emulsion composition of the present embodiment can be produced by mixing triacylglycerol, an alkane having 10 to 16 carbon atoms, ester (1), ester (2), a chain alcohol having 16 to 22 carbon atoms, water, and, if necessary, other components. One embodiment of the method for producing an emulsion composition includes a step (P1) of mixing the chain alcohol and water while heating them to prepare a mixed liquid Z (for forming a continuous phase), and a step (P2) of adding and mixing triacylglycerol, the alkane, the ester (1), and the ester (2) to the mixed liquid Z (for forming a continuous phase) to obtain a final emulsion composition.

[0053] [Process (P1)] In the step (P1), the chain alcohol and water are mixed while being heated to prepare a mixed liquid Z (for forming a continuous phase). The mixed solution Z is prepared as a base emulsion composition by dispersing an oil phase in an aqueous phase. The oil phase is obtained by mixing the chain alcohol and an oil-soluble component in the other components at an arbitrary temperature. The aqueous phase is obtained by mixing water and a water-soluble component in the other components at an arbitrary temperature.

[0054] [Process (P2)] In the step (P2), the triacylglycerol, the alkane, the ester (1), and the ester (2) are added to and mixed with the mixed liquid Z (for forming a continuous phase) to obtain the final emulsion composition. In step (P2), it is preferable to add and mix the mixed solution X of triacylglycerol and the alkane, and the mixed solution Y of the ester (1) and the ester (2) separately to the mixed solution Z prepared in step (P1). By mixing in this manner, it becomes easier to stably obtain an emulsion composition in which oil droplets are dispersed in the continuous phase. In addition, it becomes easier to obtain an emulsion composition with enhanced conditioning effect.

[0055] The mixed solution X and the mixed solution Y may contain other components as required. As the mixed solution X and the mixed solution Y, a prepared solution or a commercially available product may be used. As a commercially available product of the mixed solution X, for example, "LexFeel (registered trademark) WOW-A" manufactured by INOLEX Co., Ltd. can be suitably used. As a commercially available product of the mixed solution Y, for example, "DOCSilFee (registered trademark) YA-30H" manufactured by DOC Japan Co., Ltd. can be suitably used.

[0056] According to the manufacturing method of this embodiment described above, it is possible to easily and stably manufacture an emulsion composition having a state as shown in Fig. 4, that is, a continuous phase 10 and a dispersed phase 20 dispersed in the continuous phase 10. In addition, according to the manufacturing method of this embodiment, the particle size of the oil droplets constituting the dispersed phase 20 is controlled to an appropriate size, thereby further enhancing the conditioning effect (compare Example 7 and Example 21 described below; difference between manufacturing method (α) and manufacturing method (β); see Figs. 4 to 5).

[0057] Another embodiment of the method for producing an emulsion composition is a production method including a step (P3) of adding separately heated water to a mixture obtained by mixing a chain alcohol, a triacylglycerol, the alkane, the ester (1), and the ester (2) while heating, to obtain a final emulsion composition. According to the production method of this other embodiment, a stable emulsion composition in which oil droplets with a finer particle size are dispersed can be produced. However, in terms of the conditioning effect, the production method including the above-mentioned steps (P1) and (P2) is more likely to be improved than the production method including step (P3). EXAMPLES

[0058] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0059] <Ingredients used> In the examples and comparative examples, the following raw materials were used.

[0060] Triacylglycerols, alkanes with 10 to 16 carbon atoms Here, a premix product was used for blending. As the premix product, "LexFeel (registered trademark) WOW-A" manufactured by INOLEX was used. This premix product is a mixture of triheptanoin and an alkane having 13 to 15 carbon atoms.

[0061] Ester (1) represented by general formula (1), ester (2) represented by general formula (2) Here, a premix product was used for blending. DOCSilFee (registered trademark) YA-30H manufactured by DOC Japan Co., Ltd. was used as the premix product. This premix product is a mixture containing 2-ethylhexanoate cetyl and palmitate dextrin as the main components.

[0062] Silicones Silicone gum blend, "DOWSIL (registered trademark) BY11-003" manufactured by Dow Chemical Japan Co., Ltd. / Dow Toray Co., Ltd. was used. A mixture of gummy linear silicone and cyclic silicone pentamer. Gummy linear silicone 10%, mixture viscosity 1500mm 2 / s(25℃).

[0063] Chain alcohols with 16 to 22 carbon atoms Cetanol, "Kalcol 6098" manufactured by Kao Corporation, was used.

[0064] ·water Purified water was used.

[0065] Other ingredients Methylparaben was used as "Mekincs M" manufactured by Ueno Pharmaceutical Co., Ltd. The glycerin used was "Concentrated Glycerin" manufactured by Kao Corporation. Citric acid: "Citric Acid" manufactured by Showa Kako Co., Ltd. was used. Stearyl trimethyl ammonium chloride, "Arcade T-800" manufactured by Lion Corporation, was used. Glyceryl stearate, "Rheodor MS-165V" manufactured by Kao Corporation, was used. The lanolin used was "refined lanolin" manufactured by Nippon Fine Chemical Co., Ltd. The mineral oil used was "Hicol K-230" manufactured by Kaneda Co., Ltd. The olive oil used was "Olive Oil" manufactured by Kaneda Co., Ltd.

[0066] <Production of emulsion composition> (Comparative Examples 1 to 6, Reference Example 1, Examples 1 to 21) In Tables 1 to 5, the numerical values ​​for the raw materials used indicate the content of each raw material in the emulsion composition, and refer to the ratio (mass %; pure content equivalent) to the total mass of the emulsion composition. The production method (α) is a production method including steps (P1) and (P2) described below. The production method (β) is a production method including the step (P3) described below.

[0067] The emulsion compositions of each example were produced as described below so as to have the compositions and contents shown in Tables 1 to 5. Purified water, methylparaben, glycerin, citric acid, and stearyltrimethylammonium chloride were mixed while heating at 80° C. to prepare a mixed liquid (Z1). Glyceryl stearate, lanolin, mineral oil, olive oil, and cetanol were mixed while heating at 80° C. to prepare a mixed liquid (Z2).

[0068] A mixture of triheptanoin and an alkane having 13 to 15 carbon atoms, "LexFeel (registered trademark) WOW-A," was heated to 50° C. to prepare a mixed liquid (X0). A mixture containing cetyl 2-ethylhexanoate and dextrin palmitate as main components, "DOCSilFee (registered trademark) YA-30H," was heated to 50°C to prepare a mixed liquid (Y0).

[0069] Comparative Example 1 The mixed liquid (Z2) at 80° C. was cooled at a predetermined cooling rate, while the mixed liquid (Z1) at 80° C. was added thereto and mixed, thereby obtaining the emulsion composition of Comparative Example 1.

[0070] (Comparative Examples 2 to 3) The mixed liquid (Z2) at 80° C. was cooled at a predetermined cooling rate, while the mixed liquid (Z1) at 80° C. was added thereto and mixed, to prepare the mixed liquid (Z3). Next, the mixed liquid (Y0) at 50° C. was added to and mixed with the mixed liquid (Z3), thereby obtaining emulsion compositions of Comparative Examples 2 and 3, respectively.

[0071] (Comparative Examples 4 to 6) The mixed liquid (Z2) at 80° C. was cooled at a predetermined cooling rate, while the mixed liquid (Z1) at 80° C. was added thereto and mixed, to prepare the mixed liquid (Z3). Next, the mixed liquid (X0) at 50° C. was added to the mixed liquid (Z3) while mixing, thereby obtaining the emulsion compositions of Comparative Examples 4 to 6, respectively.

[0072] (Reference example 1) The silicone gum blend was added to and mixed with mixed liquid (Z2) at 80° C. to prepare mixed liquid (Z3). Next, while cooling at a predetermined cooling rate, the mixed liquid (Z1) at 80° C. was added to and mixed with the mixed liquid (Z3), thereby obtaining an emulsion composition of Reference Example 1.

[0073] (Examples 1 to 20) An emulsion composition was obtained by using a production method (α) including the following steps (P1) and (P2). Process (P1): The mixed liquid (Z2) at 80° C. was cooled at a predetermined cooling rate, while the mixed liquid (Z1) at 80° C. was added thereto and mixed, to prepare the mixed liquid (Z3). Process (P2): Next, the mixed liquid (X0) at 50°C was added to and mixed with the mixed liquid (Z3) prepared in step (P1), and then the mixed liquid (Y0) at 50°C was added and mixed to obtain the emulsion compositions of Examples 1 to 20, respectively.

[0074] Example 21 An emulsion composition was obtained by using a production method (β) including the following step (P3). Process (P3): Purified water, methylparaben, glycerin, citric acid, and stearyltrimethylammonium chloride were mixed while heating at 80° C. to prepare a mixed liquid (Z1). Mixed liquid (Z2) was prepared by mixing glyceryl stearate, lanolin, mineral oil, olive oil, and cetanol while heating at 80° C. Furthermore, mixed liquid (X0) at 50° C. was added and mixed into mixed liquid (Z2) at 80° C., and then mixed liquid (Y0) at 50° C. was added and mixed to prepare mixed liquid (Z4). Next, the mixed liquid (Z1) was added to and mixed with the mixed liquid (Z4) while cooling at a predetermined cooling rate, thereby obtaining an emulsion composition of Example 21.

[0075] [Table 1]

[0076] [Table 2]

[0077] [Table 3]

[0078] [Table 4]

[0079] [Table 5]

[0080] <Evaluation (1)> The emulsion composition of each example was used as a sample, and the conditioning effect was evaluated by measuring the combing force of the hair in a dry state after rinsing according to the test method described below. The evaluation results are shown in Tables 6 to 7.

[0081] <Test Method> As shown below, a hair bundle was treated to prepare damaged hair, and the combing force of the hair in a dry state after rinsing was measured.

[0082] [Preparing the hair bundle] A 10 cm long hair bundle (1 g) that had been purchased as an undamaged hair bundle was treated with a commercially available bleach (manufactured by Henkel Japan) for twice the treatment time specified in the instruction manual, rinsed with water, and then dried before being used as a hair bundle for damaged hair.

[0083] [Combing force measurement; after rinsing and in a dry state] Procedure (1): 1 g of the above-mentioned damaged hair bundle having a length of 10 cm was wetted with warm water at 40°C and lightly squeezed, and 0.1 g of the sample emulsion composition was applied so as to be spread over the entire wet hair bundle.

[0084] Step (2): The hair bundle to which the sample had been applied was immersed in 200 mL of 40°C warm water and rinsed twice, after which it was lightly squeezed so that no water dripped off (dilution rate 200 times; assuming the latter half of the rinsing step).

[0085] Step (3): After lightly wringing the hair bundle, it was allowed to dry naturally at room temperature (25°C) for 24 hours. Thereafter, the naturally dried hair bundle was combed five times, and then the measurement of the combing force was started. Step (4): The tensile strength was measured after 12 combings, and the average value was calculated.

[0086] The tensile strength was measured using Imada's ZTA / ZTS series force gauge, model DST-2N. The tensile strength during combing was measured by fixing the force gauge, suspending the hair bundle, and combing the hair bundle. That is, the maximum load was measured when the comb was held perpendicular to the length of the hair bundle and passed straight downward in the direction of gravity. In addition, the tensile strength during combing was measured by excluding the average value of multiple measurements taken after excluding the measurements taken the first one or two times and any abnormal values ​​that occurred when the comb happened to get caught on a strand of hair.

[0087] For each emulsion composition, the combing force applied to hair in a dry state after rinsing was measured, and the results are shown in Tables 6 to 7. The combing force of hair is shown as the tensile strength (unit: N (Newton)) when combing. The conditioning effect was evaluated using the emulsion composition of Reference Example 1 as a tensile strength of 0.49 N when combing.

[0088] [Table 6]

[0089] [Table 7]

[0090] From the results shown in Tables 6 to 7, the tensile strength during combing was lower when the emulsion compositions of Examples 1 to 21 were used than when the emulsion compositions of Comparative Examples 1 to 6 were used. Furthermore, the tensile strength when combing was performed using the emulsion compositions of Examples 1 to 21 was lower than the tensile strength when combing was performed using the emulsion composition of Reference Example 1. Therefore, it was confirmed that Examples 1 to 21 to which the present invention was applied were non-silicone emulsion compositions that exhibited conditioning effects equal to or greater than those of compositions containing silicones.

[0091] In addition, the tensile strength during combing was lower when the emulsion composition of Example 7 obtained by production method (α) was used than when the emulsion composition of Example 21 obtained by production method (β) was used.

[0092] <Evaluation (2)> The emulsion compositions of Comparative Example 2, Comparative Example 4, Example 6, Example 7, and Example 21 were used as samples, and the emulsified state was observed under a microscope. The microscope used was a "Digital Microscope VHX-6000-2" manufactured by Keyence Corporation. CCD photography using the microscope was performed in an environment with a temperature of 25.0°C and a relative humidity of 50%.

[0093] The images of the emulsion compositions of each example observed under the microscope are shown in FIGS. The particle size of the particles constituting the oil droplets observed in the observation image was determined by calculating the average value of the major axis of 50 particles observed in the photograph based on the scale bar (10.0 μm) at the lower right of the observation image. For one sample (emulsion composition), a representative photograph was selected from several photographs taken, and the major axis of the particles observed in the photograph was measured.

[0094] FIG. 1 is a microscopic image of the emulsion composition of Comparative Example 2 (WOW-A / YA-30H=0% by mass / 2% by mass). The oil droplets dispersed in the continuous phase had particle sizes ranging from about 10 μm to 230 μm. In plan view, not only circular but also elliptical particles were present. The amount of oil droplets observed was relatively small.

[0095] FIG. 2 is a microscopic image of the emulsion composition of Comparative Example 4 (WOW-A / YA-30H=4% by mass / 0% by mass). The oil droplets dispersed in the continuous phase had particle sizes ranging from about 10 μm to 120 μm, but not many of them had particle sizes between about 10 μm and 70 μm. Most of the oil droplets with particle sizes of 70 μm or more had an elliptical shape.

[0096] FIG. 3 is a microscopic image of the emulsion composition of Example 6 (WOW-A / YA-30H=4% by mass / 1% by mass). The oil droplets dispersed in the continuous phase had particle sizes ranging from about 10 μm to 160 μm, with most ranging from about 10 μm to 70 μm, and were nearly spherical in shape.

[0097] FIG. 4 is a microscopic image of the emulsion composition of Example 7 (WOW-A / YA-30H=4% by mass / 2% by mass; production method (α)). The oil droplets dispersed in the continuous phase had particle sizes ranging from about 10 μm to 200 μm. The oil droplets dispersed in the continuous phase were almost spherical particles. Of these, the majority had particle sizes ranging from about 10 μm to 70 μm and were spherical. The amount of oil droplets observed was relatively large.

[0098] FIG. 5 is a microscopic image of the emulsion composition of Example 21 (WOW-A / YA-30H=4% by mass / 2% by mass; production method (β)). The oil droplets dispersed in the continuous phase had particle sizes ranging from about 3 μm to 80 μm, and among these, the majority of particles had a diameter of about 20 μm or less. The oil droplets dispersed in the continuous phase were mainly spherical particles, but non-spherical particles were also present, although there were a few ellipsoidal particles.

[0099] From the above evaluations (1) and (2), it is inferred that the particle size of the oil droplets dispersed in the continuous phase is not too large and not too small, is in the range of approximately 10 μm to 70 μm, and is a particle with a nearly spherical shape, so that the tensile strength when combed is low and the conditioning effect is easily achieved. [Explanation of symbols]

[0100] 1 Emulsion composition, 10 Continuous phase, 20 Dispersed phase

Claims

1. A non-silicone emulsion composition, The present invention relates to an ester composition comprising a triacylglycerol, an alkane having 10 to 16 carbon atoms, an ester (1) represented by the following general formula (1), an ester (2) represented by the following general formula (2), a chain alcohol having 16 to 22 carbon atoms, and water, The mixing ratio of the triacylglycerol, the alkane, the ester (1), and the ester (2) is a mass ratio represented by (the total content of triacylglycerol and the alkane) / (the total content of the ester (1) and the ester (2)) is 0.3 to 8, The total content of triacylglycerol and the alkane is 0.5% by mass or more and 9% by mass or less with respect to the total mass (100% by mass) of the emulsion composition, An emulsion composition for hair cosmetics, A non-silicone emulsion composition. R １ -C(=O)-O-R ２ ・・・(1) R ３ -C(=O)-O-R ４ ・・・(2) In formula (1), R １ R represents a branched chain hydrocarbon group having 3 to 8 carbon atoms. ２ represents an aliphatic hydrocarbon group having 12 to 18 carbon atoms. In formula (2), R ３ R represents an aliphatic hydrocarbon group having 11 to 21 carbon atoms. ４ represents a polysaccharide structure polymerized through glycosidic bonds.

2. A continuous phase and a dispersed phase dispersed in the continuous phase, the continuous phase is a phase containing the chain alcohol and water, The emulsion composition according to claim 1 , wherein the dispersed phase is composed of oil droplets containing triacylglycerol, the alkane, the ester (1) and the ester (2).

3. A method for producing the emulsion composition according to claim 2, comprising the steps of: A step (P1) of mixing the chain alcohol and water while heating to prepare a mixed solution Z; a step (P2) of adding and mixing triacylglycerol, the alkane, the ester (1), and the ester (2) to the mixed liquid Z to obtain an emulsion composition; A method for producing an emulsion composition comprising the steps of:

4. In the step (P2), the mixed solution Z is The method for producing an emulsion composition according to claim 3, wherein a mixed solution X of triacylglycerol and the alkane, and a mixed solution Y of the ester (1) and the ester (2) are added separately and mixed to obtain an emulsion composition.

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