WO2024095598A1 - Procédé de production de dispersion huileuse et matériau cosmétique ayant ladite dispersion huileuse mélangée à l'intérieur de celui-ci - Google Patents

Procédé de production de dispersion huileuse et matériau cosmétique ayant ladite dispersion huileuse mélangée à l'intérieur de celui-ci Download PDF

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WO2024095598A1
WO2024095598A1 PCT/JP2023/032178 JP2023032178W WO2024095598A1 WO 2024095598 A1 WO2024095598 A1 WO 2024095598A1 JP 2023032178 W JP2023032178 W JP 2023032178W WO 2024095598 A1 WO2024095598 A1 WO 2024095598A1
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oil
dispersion
inorganic oxide
oxide powder
producing
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PCT/JP2023/032178
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English (en)
Japanese (ja)
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昇 長谷
昌平 中村
純也 中野
萌 秦
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日光ケミカルズ株式会社
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Publication of WO2024095598A1 publication Critical patent/WO2024095598A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/27—Zinc; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/29—Titanium; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/37—Esters of carboxylic acids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/92—Oils, fats or waxes; Derivatives thereof, e.g. hydrogenation products thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
    • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons

Definitions

  • the present invention relates to a method for producing an oil dispersion and a cosmetic containing the oil dispersion. More specifically, the present invention relates to a method for producing an oil dispersion that can be dispersed in an oil even if it has a high solid content by adding inorganic oxide powder to a fatty acid ester oil at a specific temperature, and to a cosmetic containing the oil dispersion produced by this production method.
  • oil dispersions for cosmetics are made by pre-dispersing pigments in an oily medium, which are blended into makeup cosmetics such as foundation, eye shadow, and blush, as well as basic cosmetics such as sunscreen cosmetics, hair cosmetics, milky lotions, and creams.
  • makeup cosmetics such as foundation, eye shadow, and blush
  • basic cosmetics such as sunscreen cosmetics, hair cosmetics, milky lotions, and creams.
  • inorganic oxide powders have strong cohesive forces between the powders, making them difficult to disperse in oil as is. Therefore, pigments used in oil dispersions are widely subjected to hydrophobic treatment in order to make it easier to disperse the inorganic oxide powder in oil.
  • a method is known in which the pigment surface is coated with silicones such as higher fatty acids, higher alcohols, hydrocarbons, silicone oils, and silicone resins to impart hydrophobicity.
  • silicones such as higher fatty acids, higher alcohols, hydrocarbons, silicone oils, and silicone resins to impart hydrophobicity.
  • many methods have been established to date for hydrophobizing pigments using silicones as surface treatment agents (see, for example, Patent Documents 1 and 2), and oil dispersions using these methods are also widely known (see, for example, Patent Documents 3, 4, and 5).
  • inorganic oxide powders have strong cohesive forces between the powder particles, it is common to disperse the inorganic oxide powder by adding silicone-based dispersants such as polyether-modified silicone or surfactants in order to suppress re-agglomeration after dispersion and maintain dispersion stability (see, for example, Patent Documents 6 and 7).
  • the method of hydrophobizing inorganic oxide powder requires a step of first treating the inorganic oxide powder with a surface treatment agent before an oil-based dispersion can be produced, which is problematic in terms of its complexity.
  • the present invention was made in consideration of the problems described above, and aims to provide a method for producing an oil dispersion that does not require prior surface treatment of the inorganic oxide powder to enhance its dispersibility in oil agents, and that can obtain an oil dispersion with excellent dispersibility of inorganic oxide powder without the addition of a dispersant, and a cosmetic that contains the oil dispersion produced by this production method.
  • an oil-based dispersion with high powder dispersibility can be obtained by heating an ester oil of a fatty acid having 8 to 22 carbon atoms at a temperature of 70°C to 120°C while adding an inorganic oxide powder, and further, that an oil-based dispersion capable of maintaining high pigment dispersibility can be obtained without using a dispersant, thus completing the present invention.
  • the method for producing an oil-based dispersion according to one embodiment of the present invention is characterized by including a step (1) of gradually adding inorganic oxide powder to an ester oil of an ester oil of a fatty acid having 8 to 22 carbon atoms while heating the ester oil at a temperature of 70°C to 120°C, and a step (2) of further mixing the dispersion to which the entire amount of inorganic oxide powder has been added at a temperature of 70°C to 120°C.
  • step (2) of the above production method it is preferable to use a kneading mixer or a wet mixer for dispersion in step (2) of the above production method.
  • One embodiment of the method for producing an oil dispersion of the present invention is a method for producing an oil dispersion, which includes step (1) of adding inorganic oxide powder while heating ester oil of fatty acid having 8 to 22 carbon atoms at a temperature of 70°C to 120°C, and step (2) of further mixing the dispersion to which the entire amount of inorganic oxide powder has been added at a temperature of 70°C to 120°C, and then cooling the oil dispersion and further dispersing it using a wet mixer/disperser.
  • step (2) of the above production method it is preferable to cool the mixture to room temperature (20°C to 30°C) and further disperse the mixture using a wet mixer.
  • the solids concentration of the inorganic oxide powder during production of the oil dispersion is 25% by mass or more.
  • the cosmetic of the present invention is characterized by containing an oil dispersion produced by the production method of the present invention.
  • the method for producing an oil-based dispersion of the present invention is characterized by including a step (1) of adding inorganic oxide powder to an ester oil of an ester oil of a fatty acid having 8 to 22 carbon atoms while heating the ester oil at a temperature of 70°C to 120°C, and a step (2) of further mixing the dispersion to which the entire amount of inorganic oxide powder has been added at a temperature of 70°C to 120°C.
  • the present invention by gradually adding inorganic oxide powder to an ester oil of a fatty acid having 8 to 22 carbon atoms while heating it at a temperature of 70°C to 120°C, it is possible to obtain an oil dispersion with high pigment dispersibility, an oil dispersion that can maintain high powder dispersibility even without the use of a dispersant, and a cosmetic product containing the same.
  • the ester oil of fatty acids having 8 to 22 carbon atoms (hereinafter, simply referred to as ester oil) used as a dispersion medium is an ester oil in which the carbon number of the fatty acid-derived portion is 8 to 22.
  • ester oil in which the carbon number of the fatty acid-derived portion is 8 to 22.
  • at least one of the fatty acids has a carbon number of 8 to 22, and preferably all of the fatty acids have a carbon number of 8 to 22.
  • tri(caprylic/capric)glyceryl is an ester of caprylic acid (C8)/capric acid (C10) and glycerin, so the fatty acid portion has 8 carbon atoms and 10 carbon atoms.
  • ester oil of fatty acids having 8 to 22 carbon atoms is non-volatile and has fluidity such as liquid or paste at 25°C.
  • non-volatile means that it does not volatilize at 25°C, but for example, it is a component whose boiling point at normal pressure exceeds 250°C.
  • Ester oil of fatty acids having less than 8 carbon atoms is not preferable because it is not possible to obtain an oil-based dispersion with good dispersibility of inorganic oxide powder.
  • a hydrocarbon oil or silicone oil other than the above ester oil is used, an oil-based dispersion with good dispersibility of the inorganic oxide powder cannot be obtained.
  • the ester oil of a fatty acid having 8 to 22 carbon atoms is an ester of a fatty acid having 8 to 18 carbon atoms.
  • the fatty acid may be a saturated fatty acid or an unsaturated fatty acid, but it is preferable that it is a saturated fatty acid, and the saturated fatty acid may be a straight chain or a branched chain.
  • ester oils include, for example, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, tricyclodecane methyl isononanoate, (caprylic acid/capric acid) coconut alkyl, hexyl laurate, methylheptyl laurate, caprylyl laurate, decyl laurate, isopropyl myristate, methylheptyl myristate, 2-hexyldecyl myristate, octyldodecyl myristate, isopropyl palmitate, methylheptyl palmitate, palmitic acid, methylheptyl palmitate ...
  • monoester oils such as 2-ethylhexyl ester, 2-ethylhexyl stearate, ethyl isostearate, isopropyl isostearate, isobutyl isostearate, decyl isostearate, methylheptyl isostearate, 2-hexyldecyl isostearate, 2-ethylhexyl hydroxystearate, octyldodecyl oleate, oleyl oleate, octyldodecyl ricinoleate, octyl p-methoxycinnamate, alkyl benzoate, and glyceryl isostearate; diisostearate, polyglyceryl diisostearate, propanediol diisostearate, di(phytosteryl/octyldodecyl) lauroyl glutamate, di(cholesteryl/behen
  • Triester oils such as trimethylolpropane triisostearate, diglyceryl triisostearate, diglyceryl triisostearate, tri(caprylic/capric)glyceryl, glyceryl trioctanoate, macadamia nut oil, olive oil, castor oil, jojoba oil, avocado oil, and sunflower oil; pentaerythrityl tetraoctanoate, diglyceryl tetraisostearate, dipentaerythrityl tetraisostearate, and pentaerythritol tetraisostearate.
  • the ester oil is at least one selected from the group consisting of coconut alkyl (caprylic/capric acid), isopropyl myristate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, decyl isostearate, methylheptyl isostearate, diglyceryl triisostearate, tri(caprylic/capric acid)glyceryl, jojoba oil, diglyceryl tetraisostearate, and dipentaerythrityl tetraisostearate.
  • the fatty acid ester oil contains tri(caprylic/capric acid)glyceryl.
  • examples of inorganic oxide powder include inorganic oxides such as silicic anhydride (silicon oxide), aluminum oxide, iron oxide (red iron oxide, yellow iron oxide, black iron oxide, etc.), titanium oxide, zinc oxide, cerium oxide, and bismuth oxide that are generally used in cosmetics.
  • examples of inorganic oxides include fine particles of titanium oxide, zinc oxide, cerium oxide, bismuth oxide, and composites thereof.
  • the inorganic oxide powder is preferably titanium oxide and/or iron oxide.
  • the inorganic oxide is an inorganic oxide powder that has not been treated with a fatty acid. In another preferred embodiment, the inorganic oxide powder has not been hydrophobized.
  • hydrophobization refers to treatment with a known hydrophobizing surface treatment agent such as silicone treatment or fatty acid treatment.
  • a known hydrophobizing surface treatment agent such as silicone treatment or fatty acid treatment.
  • an inorganic oxide that has not been hydrophobized in this way dispersibility is maintained over time.
  • the inorganic oxide powder is an untreated powder.
  • An untreated powder refers to a powder that has not been surface-treated with a surface treatment agent.
  • the particle size of the inorganic oxide is, for example, 0.001 to 50 ⁇ m, and may be 0.01 to 30 ⁇ m.
  • the particle size is based on volume and can be measured using a laser diffraction particle size distribution analyzer.
  • the solids concentration of the inorganic oxide powder in the oil dispersion is preferably 25% by mass or more, more preferably 25 to 80% by mass, even more preferably 30 to 80% by mass, even more preferably 40 to 80% by mass, and particularly preferably 40 to 70% by mass. If the solids concentration of the inorganic oxide powder is 25% by mass or more, the dispersibility of the inorganic oxide powder over time will be good, and if it is 80% by mass or less, the aggregation of the powder will be easily suppressed.
  • the method for producing the oil dispersion of the present invention is a production method that is carried out in the following order: step (1) and step (2).
  • Step (1) the inorganic oxide powder is added to the ester oil of an ester oil of a fatty acid having 8 to 22 carbon atoms while heating the ester oil at a temperature of 70° C. to 120° C., until the entire target amount is added. It is also preferable to gradually add the inorganic oxide powder to the ester oil.
  • the temperature of the ester oil is preferably 70°C to 100°C.
  • the temperature of the ester oil is preferably maintained within the above temperature range while the inorganic oxide powder is being added. It is preferable to heat the ester oil using an appropriate heating means so that the temperature is maintained within the above temperature range.
  • the time for adding the inorganic oxide powder to the ester oil is, for example, 1 to 100 minutes.
  • a dispersion method for obtaining an oil dispersion can be used in which the inorganic oxide powder is added while stirring the ester oil using a stirrer such as a homomixer or disperser.
  • the rotation speed during stirring is not particularly limited as long as the dispersion proceeds well, but is, for example, 1000 rpm to 5000 rpm.
  • dispersant in step (1).
  • examples of dispersants include those listed below.
  • Step (2) The oil dispersion obtained in the step (1) is further mixed at a temperature of 70° C. to 120° C. to obtain an oil-based dispersion.
  • the dispersion time in the step (2) is preferably 2 hours or more from the viewpoint of dispersibility of the inorganic oxide powder in the ester oil, and more preferably 2 hours to 10 hours, and even more preferably 2 hours to 5 hours, from the viewpoint of saturation of the effect.
  • dispersion may continue using a homomixer, disperser, etc., but it is preferable to use a kneading mixer capable of applying a higher shear force, such as a kneader mixer, Henschel mixer, roll mixer, or extruder mixer, or a wet mixer and disperser, such as a propeller mixer, high-speed mixer, dissolver, ultemizer, wet jet mill, colloid mill, mass colloider, (wet) bead mill, sand mill, basket mill, or AD mill.
  • a kneading mixer capable of applying a higher shear force
  • a kneader mixer Henschel mixer, roll mixer, or extruder mixer
  • a wet mixer and disperser such as a propeller mixer, high-speed mixer, dissolver, ultemizer, wet jet mill, colloid mill, mass colloider, (wet) bead mill, sand mill, basket mill, or AD mill.
  • a dispersant may be used.
  • dispersants include polyhydroxystearic acid, glyceryl hydroxystearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 tetraisostearate, erythrityl triethylhexanoate, and sorbitan sesquiisostearate. One or more of these may be used. Of these dispersants, it is most preferable to use polyhydroxystearic acid. From the viewpoint of dispersibility, the amount of dispersant used is, for example, 1 to 10 parts by mass per 100 parts by mass of the inorganic oxide.
  • the temperature conditions during production are preferably such that the ester oil and oil dispersion are heated to a temperature of 70°C to 120°C. Temperatures below 70°C are not preferred because the inorganic oxide powder cannot be uniformly dispersed in the ester oil. Temperatures above 120°C are also not preferred because the ester oil decomposes and the yellow iron oxide and black iron oxide in the inorganic oxide powder discolor.
  • the mixing temperature of the oil dispersion is preferably 70°C to 100°C in terms of the effects of the present invention. It is preferable that the temperature is within the above range during mixing, and that the temperature range is maintained while heating using an appropriate heating means.
  • steps (1) and (2) it is preferable to cool the oil dispersion and then perform an additional dispersion step, since this will further atomize the inorganic oxide powder and make it more uniformly dispersed in the oil. Cooling is preferably performed until the temperature drops to 40°C or lower, and preferably to room temperature (20°C to 30°C). Examples of cooling methods include a method in which the mixture is left to stand while continuing to stir; and a method in which the mixture is cooled using a cooling means while continuing to stir.
  • the dispersing machine used for dispersion after cooling is preferably a wet mixer dispersing machine from the viewpoint of improving the dispersibility of the inorganic oxide powder in the oil dispersion, and among these, a wet bead mill is preferable. Specific examples of wet mixer dispersing machines are as described above.
  • the dispersion time for dispersion after cooling is, for example, 15 minutes to 5 hours, and may be 30 minutes to 3 hours.
  • a dispersant when the oil dispersion is blended with a cosmetic, a dispersant can be used in the manufacturing process of the oil dispersion to the extent that it does not affect the storage stability or cosmetic durability of the cosmetic.
  • the dispersant include polyhydroxystearic acid, glyceryl hydroxystearate, polyglyceryl-2 diisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 tetraisostearate, erythrityl triethylhexanoate, sorbitan sesquiisostearate, etc., and one or more of these can be used.
  • polyhydroxystearic acid glyceryl hydroxystearate
  • polyglyceryl-2 diisostearate polyglyceryl-2 triisostearate
  • polyglyceryl-2 tetraisostearate polyerythrityl triethylhexanoate
  • sorbitan sesquiisostearate etc.
  • the cosmetic of the present invention uses a highly safe ester oil by blending the oil dispersion prepared by the above-mentioned manufacturing method, and therefore has good compatibility with other cosmetic ingredients, and has good stability over time and a good feel despite its high solids concentration, and can also be used to create cosmetics such as sunscreens with high SPF values and transparency.
  • Specific examples of cosmetics that can be used include makeup cosmetics such as foundations, eye shadows, and blushes, as well as basic cosmetics such as sunscreen cosmetics, hair cosmetics, emulsions, and creams.
  • the amount of oil dispersion blended is not particularly limited, but is preferably 0.1 to 90% by mass in the cosmetic.
  • the cosmetic of the present invention may contain ingredients that are normally used in cosmetics, such as powders, surfactants, oils, gelling agents, polymers, beauty ingredients, moisturizers, pigments, preservatives, fragrances, etc., to the extent that the effects of the present invention are not impaired.
  • the cosmetic composition of the present invention may be in any form, including powder, emulsion, cream, stick, solid, spray, and multi-layered separation.
  • Example 1 40 g of 2-ethylhexyl palmitate was heated to 90°C. After confirming that the temperature had reached 90°C, 60 g of titanium oxide (particle diameter: 0.2 ⁇ m) was gradually added over 10 minutes while stirring the 2-ethylhexyl palmitate with a disper at 2000 rpm. After the entire amount of titanium oxide was added, the mixture was further stirred at 90°C with a disper at 2000 rpm for 3 hours to obtain an oil-based dispersion of titanium oxide with a solid content concentration of 60% by mass.
  • titanium oxide particle diameter: 0.2 ⁇ m
  • Example 2 An oil dispersion of red iron oxide having a solid content concentration of 60 mass % was obtained in the same manner as in Example 1, except that red iron oxide (particle diameter: 0.5 ⁇ m) was used instead of titanium oxide.
  • Example 3 An oil dispersion of yellow iron oxide having a solid content concentration of 60 mass % was obtained in the same manner as in Example 1, except that yellow iron oxide (particle diameter: 0.7 ⁇ m) was used instead of titanium oxide.
  • Example 4 An oil dispersion of black iron oxide having a solid content concentration of 60 mass % was obtained in the same manner as in Example 1, except that black iron oxide (particle diameter: 0.2 ⁇ m) was used instead of titanium oxide.
  • Example 5 The oil dispersion obtained in Example 1 was allowed to stand while continuing to stir and cooled to room temperature (25°C), and was then dispersed and mixed for 1 hour using a wet bead mill (DYNO-MILL, Shinmaru Enterprises) under conditions of a peripheral speed of 10 m/s, ⁇ 0.5 mm zirconia beads, and a packing rate of 70%, to obtain an oil dispersion of titanium oxide with a solid content concentration of 60 mass%.
  • DYNO-MILL Shinmaru Enterprises
  • Example 6 47 g of tri(caprylic/capric)glyceryl is heated to 90°C. After confirming that the temperature has reached 90°C, 50 g of fine titanium dioxide particles (MT-05, manufactured by Teika Co., Ltd.) are gradually added over 9 minutes while stirring the tri(caprylic/capric)glyceryl with a disperser at 2000 rpm. The entire amount of fine titanium dioxide particles is charged, and 3 g of polyhydroxystearic acid (Salacos HS-6C, manufactured by Nisshin Oillio Group Co., Ltd.) is added as a dispersant.
  • MT-05 fine titanium dioxide particles
  • disperser 2000 rpm
  • the mixture is then dispersed for 2 hours using a wet bead mill (DYNO-MILL, manufactured by Shinmaru Enterprises Co., Ltd.) under conditions of a peripheral speed of 10 m/s, ⁇ 0.5 mm zirconia beads, a filling rate of 70%, and a temperature of 90°C, to obtain an oil-based dispersion having a solid concentration of fine titanium dioxide particles of 50% by mass.
  • a wet bead mill DYNO-MILL, manufactured by Shinmaru Enterprises Co., Ltd.
  • Example 7 An oil dispersion of titanium oxide having a solids concentration of 60% by mass was obtained in the same manner as in Example 1, except that coconut alkyl caprylate/caprate was used instead of 2-ethylhexyl palmitate.
  • Example 8 An oil dispersion of titanium oxide having a solids concentration of 60% by mass was obtained in the same manner as in Example 1, except that isopropyl myristate was used instead of 2-ethylhexyl palmitate.
  • Example 9 60 g of 2-ethylhexyl stearate was heated to 80° C. After confirming that the temperature had reached 80° C., 40 g of zinc oxide fine particles (MZ-500, manufactured by Teica Corporation) was gradually added over 8 minutes while stirring the 2-ethylhexyl stearate with a disper at 2000 rpm. After the entire amount of zinc oxide was added, the mixture was further stirred at 80° C. and 2000 rpm with a disper for 3 hours to obtain an oil-based dispersion of zinc oxide fine particles having a solid content concentration of 40% by mass.
  • MZ-500 zinc oxide fine particles
  • Example 10 50 g of decyl isostearate was heated to 70° C. After confirming that the temperature had reached 70° C., 50 g of titanium oxide was gradually added over 9 minutes while stirring the decyl isostearate with a disper at 2000 rpm. After the entire amount of titanium oxide was added, the mixture was further stirred at 70° C. and 2000 rpm with a disper for 3 hours to obtain an oil dispersion of titanium oxide with a solid content concentration of 50% by mass.
  • Example 11 30 g of methylheptyl isostearate was heated to 100° C. After confirming that the temperature had reached 100° C., 70 g of titanium oxide was gradually added over 11 minutes while stirring the methylheptyl isostearate with a disper at 2000 rpm. After the entire amount of titanium oxide was added, the mixture was further stirred at 100° C. and 2000 rpm with a disper for 3 hours to obtain an oil dispersion of titanium oxide with a solid content concentration of 70% by mass.
  • Example 12 An oil dispersion of titanium oxide having a solids concentration of 50 mass % was obtained in the same manner as in Example 10, except that diglyceryl triisostearate was used instead of decyl isostearate.
  • Example 13 An oil dispersion of titanium oxide having a solids concentration of 70 mass % was obtained in the same manner as in Example 11, except that jojoba oil was used instead of methylheptyl isostearate.
  • Example 14 An oil dispersion of titanium oxide having a solids concentration of 60% by mass was obtained in the same manner as in Example 1, except that diglyceryl tetraisostearate was used instead of 2-ethylhexyl palmitate.
  • Example 15 An oil dispersion of titanium oxide having a solids concentration of 60% by mass was obtained in the same manner as in Example 1, except that dipentaerythrityl tetraisostearate was used instead of 2-ethylhexyl palmitate.
  • Example 16 40 g of 2-ethylhexyl palmitate was heated to 90°C. After confirming that the temperature had reached 90°C, 60 g of titanium oxide (particle diameter: 0.2 ⁇ m) was gradually added over 10 minutes while stirring the 2-ethylhexyl palmitate with a disper at 2000 rpm.
  • titanium oxide After the entire amount of titanium oxide was added, it was dispersed for 2 hours using a wet bead mill (DYNO-MILL, Shinmaru Enterprises) under conditions of a peripheral speed of 10 m/s, ⁇ 0.5 mm zirconia beads, a filling rate of 70%, and a temperature of 90°C, to obtain an oil-based dispersion of titanium oxide with a solid content concentration of 60% by mass.
  • DYNO-MILL Shinmaru Enterprises
  • Example 17 70 g of 2-ethylhexyl palmitate was heated to 90° C. After confirming that the temperature had reached 90° C., 30 g of titanium oxide was gradually added over 5 minutes while stirring the 2-ethylhexyl palmitate with a disper at 2000 rpm. After the entire amount of titanium oxide was added, the mixture was further stirred at a temperature of 90° C. for 3 hours to obtain an oil-based dispersion of titanium oxide with a solid content concentration of 30% by mass.
  • the products of the present invention had good dispersibility one day after production and after storage at 40°C for one month. It was also found that the products of the present invention have superior dispersibility, especially dispersibility over time, compared to Comparative Examples 1 to 6. It was also found that the oil dispersions of the products of the present invention have superior dispersibility over time compared to the case of using inorganic oxide powder that has been surface-treated in advance with a fatty acid.
  • Example 18 Oil-based foundation
  • An oil-based foundation was obtained by dispersing and mixing the blended composition shown in Table 2 with a homomixer.
  • the dispersion stability of Example 18 was good (no powder aggregation or settling occurred over time).
  • Example 19 Sunscreen cream A sunscreen cream was obtained using the formulation shown in Table 3 and the method described below. The dispersion stability of Example 19 was good.
  • Examples 18 and 19 were cosmetics with good pigment dispersion stability (no powder aggregation or settling occurred over time).
  • the oil dispersion produced by the manufacturing method of the present invention is characterized in that inorganic oxide powder, which tends to aggregate, is highly dispersible in oil agents. Furthermore, this oil dispersion can provide cosmetics with good dispersion stability, and has great industrial applicability.
  • the present invention includes the following aspects:
  • a method for producing an oil dispersion containing an inorganic oxide powder and an ester oil of a fatty acid having 8 to 22 carbon atoms comprising the steps of: (1) adding an inorganic oxide powder to the ester oil while heating the ester oil at a temperature of 70° C. to 120° C.; and (2) further mixing the dispersion to which the entire amount of the inorganic oxide powder has been added at a temperature of 70°C to 120°C.
  • step (2) A method for producing an oil-based dispersion according to (1) or (2) above, in which a kneading mixer or a wet mixer/disperser is used for mixing in step (2).
  • step (2) A method for producing an oil dispersion according to any one of (1) to (3) above, in which after step (2), the oil dispersion is cooled and further dispersed using a wet mixer/disperser.
  • a method for producing an oil-based dispersion in which after all steps of the production method described in (3) above, the oil-based dispersion is cooled and further dispersed using a wet mixer disperser.
  • oil dispersion is an oil dispersion consisting of only two components: inorganic oxide powder and an ester oil of a fatty acid having 8 to 22 carbon atoms.

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  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Chemical & Material Sciences (AREA)
  • Epidemiology (AREA)
  • Birds (AREA)
  • Inorganic Chemistry (AREA)
  • Dermatology (AREA)
  • Organic Chemistry (AREA)
  • Emergency Medicine (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cosmetics (AREA)

Abstract

La présente invention aborde le problème consistant à fournir : un procédé de production d'une dispersion huileuse ayant une excellente dispersibilité d'une poudre d'oxyde inorganique, sans traiter la surface de la poudre d'oxyde inorganique à l'avance, pour augmenter la dispersibilité dans un agent huileux ; et un matériau cosmétique ayant ladite dispersion huileuse mélangée à l'intérieur de celui-ci. La poudre d'oxyde inorganique, qui s'agrège facilement, est caractérisée en ce qu'elle présente une dispersibilité élevée dans un agent huileux. De plus, la dispersion huileuse fournit le matériau cosmétique avec une bonne stabilité de dispersion.　Le procédé de production d'une dispersion huileuse produit une dispersion huileuse contenant une poudre d'oxyde inorganique et une huile d'ester d'un acide gras en C8-22, le procédé comprenant : une étape (1) pour ajouter la puissance d'oxyde inorganique à l'huile d'ester tout en chauffant l'huile d'ester à une température de 70°C à 120°C ; et une étape (2) pour mélanger, en outre, à une température de 70°C à 120°C le produit dispersé auquel la quantité totale de la poudre d'oxyde inorganique a été ajoutée.
PCT/JP2023/032178 2022-11-02 2023-09-04 Procédé de production de dispersion huileuse et matériau cosmétique ayant ladite dispersion huileuse mélangée à l'intérieur de celui-ci WO2024095598A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647941A (en) * 1987-05-30 1989-01-11 Tioxide Group Plc Oil dispersion and its production
WO2011007668A1 (fr) * 2009-07-13 2011-01-20 テイカ株式会社 Dispersion huileuse et matière cosmétique incorporant cette dispersion huileuse
JP2013121940A (ja) * 2011-11-10 2013-06-20 Taiyo Kagaku Co Ltd 油系分散剤及び油性化粧料
CN105331200A (zh) * 2015-11-13 2016-02-17 上海联锴日用化工有限公司 一种高颜料含量纯油非乳化化妆品色浆及制备方法
JP2018016576A (ja) * 2016-07-27 2018-02-01 株式会社トキワ 固形粉末化粧料及び固形粉末化粧料の製造方法
CN108272648A (zh) * 2018-03-26 2018-07-13 上海蔻沣生物科技有限公司 化妆品粉体、油性色浆及其制备方法
WO2019225491A1 (fr) * 2018-05-23 2019-11-28 株式会社コーセー Nouvelle poudre d'oxyde de titane et produit cosmétique formulé avec cette poudre

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS647941A (en) * 1987-05-30 1989-01-11 Tioxide Group Plc Oil dispersion and its production
WO2011007668A1 (fr) * 2009-07-13 2011-01-20 テイカ株式会社 Dispersion huileuse et matière cosmétique incorporant cette dispersion huileuse
JP2013121940A (ja) * 2011-11-10 2013-06-20 Taiyo Kagaku Co Ltd 油系分散剤及び油性化粧料
CN105331200A (zh) * 2015-11-13 2016-02-17 上海联锴日用化工有限公司 一种高颜料含量纯油非乳化化妆品色浆及制备方法
JP2018016576A (ja) * 2016-07-27 2018-02-01 株式会社トキワ 固形粉末化粧料及び固形粉末化粧料の製造方法
CN108272648A (zh) * 2018-03-26 2018-07-13 上海蔻沣生物科技有限公司 化妆品粉体、油性色浆及其制备方法
WO2019225491A1 (fr) * 2018-05-23 2019-11-28 株式会社コーセー Nouvelle poudre d'oxyde de titane et produit cosmétique formulé avec cette poudre

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