Gel-like water-oil emulsion composition
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- FUJIFILM CORP
- Filing Date
- 2021-09-14
- Publication Date
- 2026-08-03
Smart Images
Figure 0007898836000001 
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Abstract
Description
Technical Field
[0005]
[0001] The present disclosure relates to a gel oil-in-water emulsion composition.
Background Art
[0002] In the field of cosmetics, a gel oil-in-water emulsion composition is used for the purpose of preventing dripping when applying cosmetics to the skin.
[0003] In recent years, various usability requirements have been placed on cosmetics, and cosmetics with less stickiness and greasiness are particularly preferred. In addition, when a gel oil-in-water emulsion composition containing an ionic emulsifier is applied to the skin, the electrostatic repulsive force between the emulsion particles in the gel oil-in-water emulsion composition decreases due to the salts present on the skin, and the gel structure is broken. Therefore, the above gel oil-in-water emulsion composition can obtain a melting feeling when used.
[0004] As an oil-in-water emulsion composition containing an ionic emulsifier, Patent Document 1 and Patent Document 2 propose an oil-in-water emulsion composition containing a hydrocarbon oil or a silicone oil that is liquid at 25°C, a nonionic emulsifier, an ionic emulsifier, and water. In addition, Patent Document 3 proposes an oil-in-water emulsion composition containing a soybean oil that is liquid at 25°C, a nonionic emulsifier, an ionic emulsifier, and water. In addition, Patent Document 4 and Patent Document 5 propose a gel oil-in-water emulsion composition containing a hydrocarbon oil and a silicone oil that is liquid at 25°C, a nonionic emulsifier, an ionic emulsifier, and water.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
Patent Document 2
Patent Document 3
[0006] When ionic emulsifiers are used, the stability of the emulsion particles in the gel-like oil-in-water emulsion composition decreases, and there is a risk that the emulsion particles will coalesce over time. Furthermore, the coalescing of emulsion particles over time may reduce the hardness of the gel-like oil-in-water emulsion composition, potentially making it impossible to maintain the gel structure. Therefore, there is a need for a gel-like oil-in-water emulsion composition with excellent long-term hardness stability, specifically one that can maintain high hardness over a long period of time.
[0007] Furthermore, the gel-like oil-in-water emulsion compositions proposed in Patent Documents 1 to 5 may experience a decrease in hardness over time, making it difficult to maintain the gel structure.
[0008] This disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a gel-like oil-in-water emulsion composition that has excellent stability over time in terms of hardness, is less sticky and oily, and has a superior feel when used. [Means for solving the problem]
[0009] <1> A gel-like oil-in-water emulsion composition containing 15% by mass or more of liquid oil at 25°C, relative to its total mass. A nonionic emulsifier in an amount of 5% by mass or more relative to the total mass of the gel-like oil-in-water emulsion composition, Ionic emulsifier and, Water and, Includes, The above oil, which is liquid at 25°C, contains hydrocarbon oil and silicone oil. The average specific gravity of the liquid oil at 25°C is 0.915 or higher, and The ratio of the hydrocarbon oil content to the silicone oil content is 0.33 or less by mass. Gel-like oil-in-water emulsion composition. <2> The above hydrocarbon oil is present in an amount of 0.5% by mass or more relative to the total mass of the gel-like oil-in-water emulsion composition. the above <1> The gel-like oil-in-water emulsion composition described above. <3> Contains ethanol the above <1> or <2> The gel-like oil-in-water emulsion composition described above. <4> The gel-like oil-in-water emulsion composition contains 3% by mass or more of the above ethanol based on its total mass. the above <3> The gel-like oil-in-water emulsion composition described above. <5> Contains nicotinamide, the above <1> ~ <4> A gel-like oil-in-water emulsion composition as described in any one of the following. <6> The above ionic emulsifier is an anionic emulsifier. the above <1> ~ <5> A gel-like oil-in-water emulsion composition as described in any one of the following. <7> Contains polyoxyethylene phytosterols, the above <1> ~ <6> A gel-like oil-in-water emulsion composition as described in any one of the following. <8> The absorbance immediately after manufacturing at a wavelength of 625 nm is less than 0.15, measured using a spectrophotometer and a cell with a path length of 1 cm. the above <1> ~ <7> A gel-like oil-in-water emulsion composition as described in any one of the following. <9> It is a cosmetic product. the above <1> ~ <8> A gel-like oil-in-water emulsion composition as described in any one of the following. [Effects of the Invention]
[0010] According to this disclosure, it is possible to provide a gel-like oil-in-water emulsion composition that exhibits excellent hardness stability over time, low stickiness and oiliness, and superior usability. [Modes for carrying out the invention]
[0011] Hereinafter, embodiments for implementing the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments. In the following embodiments, the components are not essential unless otherwise specified. The same applies to numerical values and their ranges, which do not limit the present disclosure.
[0012] In the present disclosure, in the numerical range indicated by "~", the numerical values described before and after "~" are included as the minimum value and the maximum value, respectively. In the numerical ranges described stepwise in the present disclosure, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other stepwise descriptions. Also, in the numerical ranges described in the present disclosure, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
[0013] In the present disclosure, each component may contain a plurality of corresponding substances. When there are a plurality of substances corresponding to each component in the composition, the content rate of each component means the total content rate of the plurality of substances present in the composition, unless otherwise specified.
[0014] In the present disclosure, the "gel-like oil-in-water emulsion composition" of the gel-like oil-in-water emulsion composition refers to a composition in which an oil phase (emulsion particles) as a dispersed phase exists in an aqueous phase constituting a continuous phase and does not exhibit fluidity at 25°C and retains its shape in a state where no stress is applied.
[0015] In the present disclosure, the "oil" of the oil that is liquid at 25°C means an oily component having the property that the amount dissolved in 100 g of water at a liquid temperature of 20°C is less than 0.1 g.
[0016] In the present disclosure, the specific gravity of the oil means the ratio of the density (g / mL) of the oil to the density (g / mL) of water. The densities of water and the oil are measured at 25°C. Moreover, the average specific gravity at 25°C of the oil that is liquid at 25°C means the average value of the specific gravities at 25°C of the components contained in the oil that is liquid at 25°C. In this disclosure, the specific gravity of the oil may be based on catalog values. Furthermore, if the catalog value for the oil's specific gravity cannot be referenced, the oil's specific gravity shall be measured in accordance with JIS Z 8804:2012, "Method for Measuring Liquid Specific Gravity."
[0017] (Gel-like oil-in-water emulsion composition) The gel-like oil-in-water emulsion composition disclosed herein comprises 15% by mass or more of an oil that is liquid at 25°C based on the total mass of the gel-like oil-in-water emulsion composition, 5% by mass or more of a nonionic emulsifier based on the total mass of the gel-like oil-in-water emulsion composition, an ionic emulsifier, and water. The oil, which is liquid at 25°C, contains hydrocarbon oil and silicone oil. The average specific gravity of the liquid oil at 25°C is 0.915 or higher, and The ratio of hydrocarbon oil content to silicone oil content is 0.33 or less.
[0018] According to this disclosure, it is possible to provide a gel-like oil-in-water emulsion composition that exhibits excellent hardness stability over time, low stickiness and oiliness, and superior usability.
[0019] The reasons for the above effects are presumed to be as follows, but are not limited to these. The gel-like oil-in-water emulsion composition of this disclosure contains 15% by mass or more of liquid oil at 25°C relative to the total mass of the gel-like oil-in-water emulsion composition. This increases the total volume of emulsion particles and enhances the interaction between emulsion particles, which is expected to enable the gel-like oil-in-water emulsion composition to maintain high hardness over a long period of time and improve the long-term stability of hardness. Furthermore, the gel-like oil-in-water emulsion composition of this disclosure contains 5% by mass or more of a nonionic emulsifier relative to the total mass of the gel-like oil-in-water emulsion composition. This increases the total surface area of the emulsion particles and enhances the interaction between the emulsion particles, which is expected to enable the gel-like oil-in-water emulsion composition to maintain high hardness over a long period of time and improve the long-term stability of its hardness. Furthermore, the gel-like oil-in-water emulsion composition of this disclosure contains an ionic emulsifier, which increases the total surface area of the emulsion particles and increases the interaction between the emulsion particles due to electrostatic interactions by ions. This is presumed to improve the initial hardness of the gel-like oil-in-water emulsion composition and suppress the decrease in hardness over time. Furthermore, the oil contained in the gel-like oil-in-water emulsion composition of this disclosure, which is liquid at 25°C, contains hydrocarbon oil and silicone oil, and has an average specific gravity of 0.915 or higher at 25°C. This is presumed to reduce the specific gravity difference between the aqueous phase and the oil phase, thereby improving the long-term stability of the hardness. Furthermore, by having a ratio of hydrocarbon oil content to silicone oil content of 0.33 or less, it is possible to reduce the volume of oil in the gel-like oil-in-water emulsion composition of this disclosure, and it is presumed that a gel-like oil-in-water emulsion composition with less stickiness and greasiness can be obtained.
[0020] From the viewpoint of the long-term stability of hardness, the average specific gravity of a liquid oil at 25°C is preferably 0.917 or higher, and more preferably 0.919 or higher. The above average specific gravity does not have any particular upper limit, but for example, it can be set to 0.97 or less.
[0021] From the viewpoint of reducing stickiness and greasiness, the ratio of hydrocarbon oil content to silicone oil content (hydrocarbon oil content / silicone oil content) is preferably 0.30 or less by mass, more preferably 0.25 or less, and even more preferably 0.17 or less. The lower limit of the above content ratio is not particularly limited, but for example, it can be 0.015 or higher.
[0022] From the viewpoint of transparency, the absorbance of the gel-like oil-in-water emulsion composition of this disclosure immediately after production at a wavelength of 625 nm, measured using a spectrophotometer and a cell with an optical path length of 1 cm, is preferably less than 1.0, more preferably less than 0.15, and even more preferably less than 0.07. In this disclosure, "immediately manufactured gel-like oil-in-water emulsion composition" means a gel-like oil-in-water emulsion composition manufactured within 3 days. The 3 days include 24 hours of storage for the absorbance measurement described below. Absorbance is measured as follows: First, place 100g of the sample to be measured into a glass container measuring 47mm in diameter and 90mm in height, and store it at 25°C for 24 hours with the cap on. Next, the sample to be measured, after being stored at 25°C for 24 hours, is subjected to a defoaming treatment. The defoaming treatment is not particularly limited and may include centrifugal defoaming, vacuum defoaming, vacuum centrifugal defoaming, etc. For example, the sample is placed in a disposable polystyrene cell with a path length of 1 cm, and the cell is centrifuged in a small refrigerated centrifuge at 4000 rpm (revolutions per minute) for 2 minutes to remove air bubbles. The absorbance of the sample after defoaming treatment is measured using a spectrophotometer to detect light at a wavelength of 625 nm. While there are no particular limitations on the small refrigerated centrifuge, for example, the CF5RX manufactured by Hitachi Koki Co., Ltd. can be suitably used. Furthermore, while the spectrophotometer is not particularly limited, for example, the U-3310 manufactured by Hitachi, Ltd. can be suitably used.
[0023] From the viewpoint of transparency, the average particle size of the emulsion particles contained in the gel-like oil-in-water emulsion composition of this disclosure is preferably 20 nm to 200 nm, more preferably 30 nm to 150 nm, even more preferably 40 nm to 100 nm, and particularly preferably 45 nm to 80 nm. In this disclosure, "average particle diameter" means volume-average particle size determined by dynamic light scattering. Examples of dynamic light scattering particle size analyzers include the concentrated particle size analyzer FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.), NanoTrack UPA (manufactured by Nikkiso Co., Ltd.), and the dynamic light scattering particle size distribution analyzer LB-550 (manufactured by Horiba, Ltd.). The average particle size is measured by diluting the gel-like oil-in-water emulsion composition 100 times by mass with pure water and performing the measurement at 25°C. Furthermore, the "pure water" used will be pure water obtained from an ultrapure water production system manufactured by Merck KGaA or similar equipment.
[0024] (Oil is liquid at 25℃) The oils that are liquid at 25°C in the gel-like oil-in-water emulsion composition of this disclosure include hydrocarbon oils and silicone oils.
[0025] Examples of hydrocarbon oils include squalane, liquid paraffin, hydrogenated polyisobutene, and cyclohexane. Among these, squalane is preferred from the viewpoint of moisturizing properties.
[0026] From the viewpoint of maintaining hardness stability over time and reducing stickiness and oiliness, the specific gravity of the hydrocarbon oil is preferably 0.75 to 0.87, and more preferably 0.79 to 0.85.
[0027] From the viewpoint of maintaining hardness over time and reducing stickiness and oiliness, the hydrocarbon oil content relative to the total mass of the gel-like oil-in-water emulsion composition of this disclosure is preferably 0.5% by mass or more, and more preferably 1% by mass or more. Furthermore, when a gel-like oil-in-water emulsion composition is applied to the skin, depending on the components it contains, aggregates of the gel-like oil-in-water emulsion composition (hereinafter referred to as cosmetic residue) may form. However, by setting the hydrocarbon oil content to 0.5% by mass or more, the formation of cosmetic residue can be suppressed. There is no particular upper limit to the hydrocarbon oil content, but for example, it can be 10% by mass or less.
[0028] Examples of silicone oils include dimethicone, trisiloxane, cyclomethicone, cyclopentasiloxane, methyl trimethicone, caprylyl methicone, phenyl trimethicone, diphenyl dimethicone, and diphenylsiloxy phenyl trimethicone. Among those mentioned above, at least one selected from the group consisting of dimethicone, methyl trimethicone, caprylyl methicone, and cyclopentasiloxane is preferred because it is less sticky and oily and has a good feel when used, and at least one selected from the group consisting of dimethicone and cyclopentasiloxane is more preferred.
[0029] From the viewpoint of maintaining hardness stability over time and reducing stickiness and greasiness, the specific gravity of the silicone oil is preferably 0.85 to 0.99, and more preferably 0.89 to 0.98.
[0030] From the viewpoint of ensuring long-term stability of hardness and reducing stickiness and oiliness, the content of silicone oil relative to the total mass of the gel-like oil-in-water emulsion composition of this disclosure is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 17% by mass or more. There is no particular upper limit to the silicone oil content, but for example, it can be 27% by mass or less.
[0031] The viscosity of the liquid oil at 25°C is not particularly limited, but may range from 0.1 mPa·s to 10,000 mPa·s, or from 1 mPa·s to 1,000 mPa·s. In this disclosure, the viscosity of liquid oil at 25°C is measured at 25°C and 1 atmosphere using a rotational viscometer (for example, product name "VISCOMETER TV-22" manufactured by Toki Sangyo Co., Ltd.).
[0032] From the viewpoint of the long-term stability of hardness, the content of liquid oil at 25°C relative to the total mass of the gel-like oil-in-water emulsion composition of the present disclosure is preferably 15% to 30% by mass, more preferably 18% to 27% by mass, and even more preferably 20% to 26% by mass.
[0033] (Nonionic emulsifier) Examples of nonionic emulsifiers include fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenol ethers, and polyoxyethylene sorbitan alkyl esters. From the viewpoint of the long-term stability of hardness, fatty acid esters are preferred among the above as nonionic emulsifiers. Examples of fatty acid esters include fatty acid sucrose, fatty acid glyceryl, and fatty acid polyglyceryl. Examples of fatty acid sucrose include sucrose stearate, sucrose distearate, sucrose tristearate, sucrose tetrastearate, sucrose laurate, sucrose dilaurate, sucrose trilaurate, sucrose tetralaurate, sucrose palmitate, sucrose dipalmitate, sucrose tripalmitate, sucrose tetrapalmitate, sucrose myristate, sucrose dimyristate, sucrose trimyristate, and sucrose tetramyristate. Examples of fatty acid glyceryls include glyceryl stearate, glyceryl myristate, glyceryl oleate, and glyceryl isostearate. Examples of fatty acid polyglyceryls include polyglyceryl-5 oleate, polyglyceryl-10 laurate, polyglyceryl-10 oleate, and polyglyceryl-10 palmitate.
[0034] From the viewpoint of maintaining hardness stability over time and reducing stickiness and oiliness, the content of nonionic emulsifier relative to the total mass of the gel-like oil-in-water emulsion composition is preferably 5.2% to 10% by mass, more preferably 5.4% to 8% by mass, and even more preferably 5.6% to 7% by mass.
[0035] (Ionic emulsifier) The ionic emulsifier contained in the gel-like oil-in-water emulsion composition of this disclosure may be an anionic emulsifier or a cationic emulsifier, but from the viewpoint of hardness stability, an anionic emulsifier is preferred. Furthermore, an anionic emulsifier and a cationic emulsifier may be used in combination.
[0036] Examples of anionic emulsifiers include glutamates, fatty acid salts with 12 to 24 carbon atoms, alkyl sulfates, alkyl ether sulfates, and alkyl phosphates. Among these, glutamates are preferred from the viewpoint of the long-term stability of hardness.
[0037] Examples of glutamates include acyl glutamates and surfactant sodium. From the viewpoint of the long-term stability of hardness, acyl glutamates are preferred.
[0038] Examples of acyl glutamates include sodium cocoyl glutamate, disodium cocoyl glutamate, potassium cocoyl glutamate, triethanolamine cocoyl glutamate, sodium N-lauroyl-L-glutamate, disodium N-lauroyl-L-glutamate, potassium N-lauroyl-L-glutamate, triethanolamine N-lauroyl-L-glutamate, sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, sodium stearoyl glutamate, potassium N-stearoyl-L-glutamate, sodium palm fatty acid glutamate, and sodium dilauroyl glutamate lysine. Among those mentioned above, sodium stearoyl glutamate is preferred from the viewpoint of the long-term stability of hardness. Examples of sodium stearoyl glutamate include N-stearoyl-L-sodium glutamate and N-stearoyl-L-sodium glutamate.
[0039] Examples of cationic emulsifiers include dodecyltrimethylammonium salt, cetyltrimethylammonium salt, decyltrimethylammonium salt, stearyltrimethylammonium salt, cetylpyridium salt, decylpyridium salt, stearylpyridium salt, oxyalkylenetrialkylammonium salt, and dioxyalkylenedialkylammonium salt.
[0040] From the viewpoint of the long-term stability of hardness, the content of the ionic emulsifier relative to the total mass of the gel-like oil-in-water emulsion composition is preferably 0.1% to 5% by mass, and more preferably 0.2% to 3% by mass.
[0041] (water) Examples of water include ion-exchanged water, pure water, purified water, and tap water, and among these, purified water is preferred due to its applicability to cosmetics.
[0042] The water content relative to the total mass of the gel-like oil-in-water emulsion composition is not particularly limited and can be 30% to 70% by mass.
[0043] (ethanol) From the viewpoint of hardness stability over time and transparency, the gel-like oil-in-water emulsion composition of this disclosure preferably contains ethanol. Anhydrous ethanol may be used as the ethanol.
[0044] From the viewpoint of hardness stability over time and transparency, the ethanol content of the gel-like oil-in-water emulsion composition of this disclosure is preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 7% by mass or less. Furthermore, there is no particular upper limit to the ethanol content; for example, it may be 27% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less.
[0045] (Nicotinamide) From the viewpoint of transparency, the gel-like oil-in-water emulsion composition of this disclosure preferably contains nicotinamide. Nicotinamide is a water-soluble vitamin, and the gel-like oil-in-water emulsion composition containing nicotinamide has effects such as improving rough skin, whitening, and wrinkle reduction. When nicotinamide is contained in a gel-like oil-in-water emulsion composition, the initial hardness and the long-term stability of hardness of the gel-like oil-in-water emulsion composition may decrease. In this disclosure, an oil that is liquid at 25°C is used, having an average specific gravity of 0.915 or higher at 25°C and a ratio of hydrocarbon oil content to silicone oil content of 0.33 or less. This makes it possible to suppress the decrease in initial hardness and the long-term stability of hardness of the gel-like oil-in-water emulsion composition due to the use of nicotinamide.
[0046] From the viewpoint of transparency and the long-term stability of hardness, the content of nicotinamide relative to the total mass of the gel-like oil-in-water emulsion composition is preferably 0.5% to 10% by mass, and more preferably 1% to 7% by mass. Furthermore, by setting the nicotinamide content within the above numerical range, the stickiness of the gel-like oil-in-water emulsion composition of this disclosure can be suppressed.
[0047] (Cholesterol and phytosterols) From the viewpoint of the long-term stability of hardness, the gel-like oil-in-water emulsion composition of this disclosure preferably further contains at least one of cholesterol and phytosterol. In this disclosure, "cholesterol" is a general term for sterol compounds found in animals, and "phytosterol" is a general term for sterol compounds found in plants. Furthermore, in this disclosure, "cholesterol" and "phytosterol" include their derivatives.
[0048] Examples of cholesterol include cholesterol, dihydrocholesterol, dehydrocholesterol, cholesteryl oleate, cholesteryl isostearate, cholesteryl hydroxystearate, and polyoxyethylene cholesteryl ether.
[0049] Phytosterols are preferably phytosterol polyglyceryl ethers, and more preferably polyoxyethylene phytosterols. Examples of phytosterols include sitosterol, stigmasterol, fucosterol, spinasterol, and brassicasterol.
[0050] Among the above, from the viewpoint of the long-term stability of hardness, the gel-like oil-in-water emulsion composition of this disclosure preferably contains polyoxyethylene phytosterol.
[0051] From the viewpoint of the long-term stability of hardness, it is preferable that the average number of moles of oxyethylene groups added to polyoxyethylene phytosterol is 5 or more. The average number of moles of oxyethylene groups added can be determined by referring to catalog values.
[0052] From the viewpoint of ensuring stability of hardness over time and reducing stickiness and oiliness, the content of at least one of cholesterol and phytosterols relative to the total mass of the gel-like oil-in-water emulsion composition is preferably 0.1% to 5% by mass, more preferably 0.2% to 3% by mass, and even more preferably 0.5% to 2% by mass.
[0053] (Water-soluble moisturizer) The gel-like oil-in-water emulsion composition disclosed herein may contain a water-soluble humectant. In this disclosure, "water-soluble" means that the solubility in 100g of water at a liquid temperature of 22°C and pH 7.0 is 0.1g or more.
[0054] From the viewpoint of usability, water-soluble humectants are preferably sugars. In this disclosure, sugars include derivatives. Examples of sugar derivatives include sugars modified with an oxyethylene group.
[0055] Examples of sugars include glucose, sucrose, sorbitol, trehalose, maltose, mannitol, and maltotriose.
[0056] From the viewpoint of usability, the content of the water-soluble humectant relative to the total mass of the gel-like oil-in-water emulsion composition is preferably 2% to 20% by mass, more preferably 4% to 15% by mass, and even more preferably 6% to 13% by mass.
[0057] (others) The gel-like oil-in-water emulsion composition of this disclosure may contain other components such as fragrances, pH adjusters, pH buffers, anti-inflammatory agents, keratolytic agents, blood circulation promoters, antioxidants, preservatives, chelating agents, UV absorbers, colorants, lipids other than cholesterol and phytosterols (e.g., lecithin), and carotenoids (astaxanthin, β-carotene, zeaxanthin, lycopene, lutein, etc.).
[0058] (Polymer thickener) From the viewpoint of reducing stickiness and oiliness, if the gel-like oil-in-water emulsion composition of this disclosure contains a polymer thickener, the content of the polymer thickener relative to the total mass of the gel-like oil-in-water emulsion composition is preferably less than 1% by mass, more preferably less than 0.1% by mass, and even more preferably less than 0.05% by mass. Furthermore, it is particularly preferable that the gel-like oil-in-water emulsion composition of this disclosure does not contain polymer thickeners.
[0059] (Application) The gel-like oil-in-water emulsion composition of this disclosure can be used as a cosmetic or the like. Examples of cosmetics include skincare cosmetics (lotions, serums, etc.), body cosmetics (body lotions, etc.), and scalp cosmetics.
[0060] The containers used to fill the cosmetics are not particularly limited, but airless containers or shut-off airless containers are preferred because they suppress the entry of bacteria from the outside air and allow for long-term use in a sterile state. Furthermore, it is preferable that the cosmetics be filled into the containers by aseptic filling.
[0061] (Method for producing a gel-like oil-in-water emulsion composition) A method for producing the gel-like oil-in-water emulsion composition of this disclosure is described below, but is not limited thereto.
[0062] A gel-like oil-in-water emulsion composition can be produced by mixing an oil phase composition containing at least an oil, a nonionic emulsifier, and an ionic emulsifier (both liquid at 25°C) with an aqueous phase composition containing at least water, and then subjecting the resulting mixture to an emulsification treatment.
[0063] The oil phase composition can be obtained by adding a nonionic emulsifier and an ionic emulsifier to a liquid oil at 25°C, heating it, and dissolving them. Cholesterol, phytosterols, lipids other than cholesterol and phytosterols, carotenoids, etc. may be added to the above oil. There are no particular restrictions on the heating conditions; for example, the temperature can be 50°C to 90°C for 10 to 60 minutes.
[0064] The aqueous phase composition can be obtained by adding ethanol, a water-soluble humectant, nicotinamide, a preservative, a fragrance, etc., to water, heating it, and dissolving the mixture. There are no particular restrictions on the heating conditions; for example, the temperature can be 50°C to 90°C for 10 to 60 minutes.
[0065] Since fine emulsion particles can be obtained and the transparency of the gel-like oil-in-water emulsion composition can be improved, it is preferable to carry out the emulsification treatment under high-pressure conditions. In the emulsification process, the shear force applied to the mixture is preferably 100 MPa or more, more preferably 150 MPa or more, and even more preferably 200 MPa or more.
[0066] The stirring device used in the emulsification process under the high-pressure conditions described above is not particularly limited and can be used in various ways, including high-speed stirring methods using homomixers, disperser mixers, ultramixers, etc., ultrasonic methods using ultrasonic homogenizers, and high-pressure homogenizer methods that apply high shear force using high-pressure homogenizers.
[0067] Examples of ultrasonic homogenizers include those manufactured by Nippon Seiki Seisakusho Co., Ltd. (US-600, US-1200T, RUS-1200T, MUS-1200T, etc.) and ultrasonic processors manufactured by Hielscher (UIP2000, UIP-4000, UIP-8000, UIP-16000, etc.). These high-power ultrasonic irradiation devices are preferably used at frequencies of 25 kHz or less, more preferably 15 kHz to 20 kHz.
[0068] Examples of high-pressure homogenizers include chamber-type high-pressure homogenizers and homogenized valve-type high-pressure homogenizers. Chamber-type high-pressure homogenizers include microfluidizers (microsifers) Examples include the DIX Corporation, the Nanomizer (manufactured by Yoshida Machinery Industry Co., Ltd.), and the Ultimizer (manufactured by Sugino Machine Co., Ltd.). As for homogenized valve type high-pressure homogenizers, there is the Gorin type homogenizer (APV Corporation). (manufactured by Lannier), Lannier-type homogenizer (manufactured by Lannier), high-pressure homogenizer (Niro Soavi). Examples include (manufactured by the company), homogenizer (manufactured by Sanwa Machinery Co., Ltd.), high-pressure homogenizer (manufactured by Izumi Food Machinery Co., Ltd.), and ultra-high-pressure homogenizer (manufactured by Ika Co., Ltd.).
[0069] The manufactured gel-like oil-in-water emulsion composition may be subjected to sterilization. Furthermore, sterilization may be performed on the oil phase composition and aqueous phase composition described above. Sterilization methods include autoclave sterilization, filtration sterilization, plasma sterilization, sterilization using chemicals such as sterilizing agents, sterilization using sterilizing gases such as ethylene oxide gas, and sterilization by irradiation with radiation such as gamma rays.
[0070] All documents, patent applications, and technical standards described herein are incorporated by reference to the same extent as if each individual document, patent application, and technical standard were specifically and individually noted to be incorporated by reference. [Examples]
[0071] The above embodiments will be described in detail below with reference to examples, but the above embodiments are not limited to these examples. Unless otherwise specified, the values of each component in Tables 1, 2, and 3 represent the content (mass%) relative to the total mass of the gel-like oil-in-water emulsion composition.
[0072] <Examples 1-1 to 1-15> (Preparation of oil phase composition) The nonionic and ionic emulsifiers listed in Table 1 below were added to liquid oil at 25°C, heated at 70°C for 30 minutes to dissolve, and an oil phase composition was obtained. In Examples 1-14, polyoxyethylene phytosterol was further added to the oil and heated and dissolved at 70°C for 45 minutes.
[0073] (Preparation of aqueous phase composition) A mixed solvent of water and ethanol was prepared and used as the aqueous phase composition. In Examples 1-8, ethanol was not used, and water was used as the aqueous phase composition.
[0074] (Manufacturing of gel-like oil-in-water emulsion composition) While stirring the aqueous phase composition, the oil phase composition was added to the aqueous phase composition, and a preliminary emulsion was obtained by ultrasonic treatment for 1 minute per 100g using an ultrasonic homogenizer (US-600, manufactured by Nippon Seiki Seisakusho Co., Ltd.). Next, the obtained preliminary emulsion was emulsified using an ultra-high pressure emulsifier (Ultimizer HJP-25001, manufactured by Sugino Machine Co., Ltd.) with a shear force of 245 MPa to obtain a gel-like oil-in-water emulsion composition.
[0075] <Comparative Example 1 to Comparative Example 5> A gel-like oil-in-water emulsion composition was obtained in the same manner as in Example 1-1, except that the content of the liquid oil at 25°C and the ratio of the hydrocarbon oil content to the silicone oil content in the liquid oil at 25°C were changed as shown in Table 2.
[0076] <Examples 2-1 to 2-7> (Preparation of oil phase composition) The nonionic and ionic emulsifiers listed in Table 3 below were added to liquid oil at 25°C, heated at 70°C for 30 minutes to dissolve, and an oil phase composition was obtained. In Examples 2-5, polyoxyethylene phytosterol was further added to the oil and heated to dissolve at 70°C for 45 minutes.
[0077] (Preparation of aqueous phase composition) A mixed solvent of water and ethanol was prepared, nicotinamide was added to the mixed solvent, and the mixture was heated at 70°C for 45 minutes to dissolve it, resulting in an aqueous phase composition.
[0078] (Manufacturing of gel-like oil-in-water emulsion composition) A gel-like oil-in-water emulsion composition was obtained in the same manner as in Example 1-1, except that the above-mentioned oil phase composition and aqueous phase composition were used.
[0079] The details of each component in Tables 1 to 3 are as follows. • Hydrocarbon oil A: Squalane, specific gravity 0.81 g / mL • Hydrocarbon oil B: Liquid paraffin, specific gravity 0.823 g / mL • Silicone oil A: Dimethicone, specific gravity 0.915 g / mL • Silicone oil B: Cyclopentasiloxane, specific gravity 0.96 g / mL Nonionic emulsifier A: Sucrose stearate Nonionic emulsifier B: Glyceryl stearate Nonionic emulsifier C: Polyglyceryl-5 oleate • Ionic emulsifier: Sodium stearoyl glutamate • Polyoxyethylene phytosterol: PEG-5 phytosterol
[0080] <<Measurement of initial hardness>> 100 g of the gel-like oil-in-water emulsion composition obtained in the above examples and comparative examples was placed in a glass container measuring 47 mm in diameter and 90 mm in height, and capped. The gel-like oil-in-water emulsion composition used was freshly manufactured (within 24 hours of manufacture). Next, the hardness of the gel-like oil-in-water emulsion composition, stored at 25°C for 24 hours, was measured using a viscoelasticity measuring device (FUDOH REHOMETER, manufactured by Rheotec Co., Ltd.) while it was in the aforementioned glass container. Specifically, a gel-like oil-in-water emulsion composition stored at 25°C for 24 hours was subjected to a 20mm diameter adapter tip being inserted 20mm into the composition at a speed of 60mm / min with a 200g load under an ambient temperature of 25°C. The peak stress value measured at the time of insertion was defined as the initial hardness. The measured initial hardness values are summarized in Tables 1 to 3.
[0081] <<Evaluation of hardness stability over time>> 100 g of the gel-like oil-in-water emulsion composition obtained in the above examples and comparative examples was placed in a glass container measuring 47 mm in diameter and 90 mm in height, capped, and stored at 50°C for 45 days. After storage, the hardness of the gel-like oil-in-water emulsion composition was measured in the same manner as the initial hardness measurement described above, and evaluated according to the following evaluation criteria. The measured hardness and evaluation results are summarized in Tables 1 to 3. (Evaluation Criteria) A: The hardness was 10g or more. B: The hardness was less than 10g.
[0082] <<User Experience Evaluation>> <Sticky> Ten expert panelists were asked to apply the gel-like oil-in-water emulsion compositions obtained in the above examples and comparative examples to the inside of their forearms with their fingers. They then evaluated the stickiness felt on their fingers when touching the skin after application, based on the evaluation criteria below. The evaluation results are summarized in Tables 1 to 3. (Evaluation Criteria) A: I don't feel any stickiness at all. B: I hardly feel any stickiness. C: I felt it was sticky. D: I felt a strong stickiness.
[0083] <Oilyness> Ten expert panelists were asked to apply the gel-like oil-in-water emulsion compositions obtained in the above examples and comparative examples to the inside of their forearms with their fingers. After application, they touched the skin with their fingers and evaluated the oiliness they felt, which was defined as oiliness, based on the evaluation criteria below. The evaluation results are summarized in Tables 1 to 3. (Evaluation Criteria) A: It doesn't feel oily at all. B: It doesn't feel greasy at all. C: I felt it was oily. D: I felt it was very oily.
[0084] <<Transparency Assessment>> 100 g of the gel-like oil-in-water emulsion composition obtained in Examples 1-3, 1-8 to 1-10, 1-15, 2-1, and 2-6 to 2-7 was placed in a glass container with a diameter of 47 mm and a height of 90 mm, capped, and stored at 25°C for 24 hours. After 24 hours at 25°C, the gel-like oil-in-water emulsion composition was placed in a disposable polystyrene cell with a path length of 1 cm, and the cell was centrifuged at 4000 rpm (reviews per minute) for 2 minutes using a small refrigerated centrifuge (Hitachi Koki Co., Ltd., CF5RX, swing rotor: T4SS31) to remove air bubbles. The gel-like oil-in-water emulsion composition used was one that was immediately after production (within 24 hours of production). The absorbance of the gel-like oil-in-water emulsion composition after defoaming treatment was measured for light at a wavelength of 625 nm using a spectrophotometer (Hitachi, Ltd., U-3310). Based on the evaluation criteria below, the transparency of the gel-like oil-in-water emulsion compositions obtained in the above examples and comparative examples was evaluated, and the evaluation results are summarized in Tables 1 and 3. (Evaluation Criteria) A: The absorbance was less than 0.07, confirming extremely excellent transparency. B: The absorbance was between 0.07 and 0.15, confirming excellent transparency. C: The absorbance was between 0.15 and 1.0, confirming transparency. D: The absorbance was 1.0 or higher, indicating insufficient transparency.
[0085] <<Evaluation of cosmetic residue suppression>> One expert panelist was asked to apply the gel-like oil-in-water emulsion compositions obtained in Examples 1-11 and 1-12 to the inside of their forearm with their finger, and the occurrence of cosmetic residue was observed. The results were evaluated based on the following evaluation criteria and are summarized in Table 1. (Evaluation Criteria) A: No makeup residue was left behind at all. B: A small amount of cosmetic residue was generated, but it was within a practically acceptable range. C: A large amount of cosmetic residue was generated, which was outside the range of what is practically acceptable.
[0086] [Table 1]
[0087] [Table 2]
[0088] [Table 3]
[0089] The results in Table 1 show that the gel-like oil-in-water emulsion compositions obtained in the examples all had a hardness of 10 g or more after being stored at 50°C for 45 days, confirming that they possess high long-term stability and can maintain high hardness over a long period. In contrast, the results in Table 2 show that the gel-like oil-in-water emulsion compositions obtained in Comparative Example 1 and Comparative Example 2 all had a hardness of less than 10 g after being stored at 0°C for 45 days, indicating that there was room for improvement in the long-term stability of hardness. The results in Table 3 show that the gel-like oil-in-water emulsion compositions obtained in the examples, despite containing nicotinamide, all exhibited a hardness of 10 g or more after 45 days of storage at 50°C, confirming their high long-term stability and ability to maintain high hardness over extended periods. Furthermore, the results in Tables 1 and 3 confirm that the gel-like oil-in-water emulsion compositions obtained in the examples had fewer panelists who felt stickiness and oiliness, and thus demonstrated superior usability. In contrast, the results in Table 2 show that many panelists found the gel-like oil-in-water emulsion compositions obtained in Comparative Examples 3 to 5 to be sticky and oily, indicating room for improvement in usability. Furthermore, by comparing the gel-like oil-in-water emulsion composition obtained in Comparative Example 3 with the gel-like oil-in-water emulsion composition obtained in Comparative Example 4, it can be seen that the time-dependent stability of hardness can be adjusted by adjusting the average specific gravity of the liquid oil at 25°C. Furthermore, by comparing the gel-like oil-in-water emulsion composition obtained in Comparative Example 3 with the gel-like oil-in-water emulsion composition obtained in Comparative Example 5, it can be seen that the stickiness and oiliness of the gel-like oil-in-water emulsion composition can be adjusted by adjusting the ratio of hydrocarbon oil content to silicone oil content.
Claims
1. A gel-like oil-in-water emulsion composition containing 15% by mass or more of liquid oil at 25°C, relative to its total mass. A nonionic emulsifier in an amount of 5% by mass or more relative to the total mass of the gel-like oil-in-water emulsion composition, Anionic emulsifier and, Water and, Includes, The oil, which is liquid at 25°C, contains hydrocarbon oil and silicone oil. The average specific gravity of the oil, which is liquid at 25°C, at 25°C is 0.915 or higher, and The ratio of the hydrocarbon oil content to the silicone oil content is 0.33 or less by mass. Gel-like oil-in-water emulsion composition.
2. The hydrocarbon oil is present in an amount of 0.5% by mass or more relative to the total mass of the gel-like oil-in-water emulsion composition. The gel-like oil-in-water emulsion composition according to claim 1.
3. Contains ethanol A gel-like oil-in-water emulsion composition according to claim 1 or claim 2.
4. The gel-like oil-in-water emulsion composition contains 3% by mass or more of the ethanol based on its total mass. The gel-like oil-in-water emulsion composition according to claim 3.
5. Contains nicotinamide, A gel-like oil-in-water emulsion composition according to any one of claims 1 to 4.
6. Contains polyoxyethylene phytosterols, A gel-like oil-in-water emulsion composition according to any one of claims 1 to 5.
7. The absorbance immediately after manufacturing at a wavelength of 625 nm is less than 0.15, measured using a spectrophotometer and a cell with a path length of 1 cm. A gel-like oil-in-water emulsion composition according to any one of claims 1 to 6.
8. It is a cosmetic product. A gel-like oil-in-water emulsion composition according to any one of claims 1 to 7.