Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/04—Dispersions; Emulsions
  • A61K8/06—Emulsions
• • 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
  • A61K8/29—Titanium; Compounds 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

Definitions

• the present invention relates to an oil-based or emulsion makeup cosmetic.
• the present invention relates to an oil-based or emulsion makeup cosmetic that is environmentally friendly and safe, has a uniform finish, and is highly stable.
• ultrafine titanium oxide and ultrafine zinc oxide with an average particle size of 50 nm or less have been used as UV scattering agents due to their high UV protection effect.
• Cosmetics containing ultrafine titanium oxide with an average particle size of 50 nm or less and volatile cyclic silicone are known (see, for example, Patent Documents 1 and 2).
• Volatile cyclic silicone and microplastic beads are useful for achieving a uniform finish and reducing unnatural gloss.
• the issue of environmental pollution caused by volatile cyclic silicone and microplastic beads has become apparent.
• a water-in-oil emulsion cosmetic contains, relative to the total amount of the cosmetic, 5-15% by mass of an oil-soluble film-forming agent (A), 0.1-5% by mass of a glycerin fatty acid ester (B), and 20-50% by mass of a volatile linear silicone oil (C) (see, for example, Patent Document 3).
• the invention disclosed in Patent Document 3 achieves stability and good spreadability of the cosmetic by using components (B) and (C) in combination instead of the volatile cyclic silicone.
• a water-in-oil emulsion cosmetic contains (A) a solid oil powder, (B) an emulsifiable silicone elastomer, and (C) titanium oxide in an oil phase containing a volatile oil, in which the volatile oil is a hydrocarbon oil or an acyclic silicone (see, for example, Patent Document 4).
• titanium dioxide particles smaller than 60 nm are said to cause inflammation when ingested into the body, raising safety concerns.
• sunscreen users especially European consumers, tend to avoid incorporating titanium dioxide particles with a particle size of 60 nm or less into cosmetics.
• makeup cosmetics that contain a large amount of titanium dioxide with a small particle size have the problem of creating an unnatural and unpleasant glossy texture, which settles into the unevenness of the skin when applied, resulting in an uneven finish.
• the present invention relates to an oil-based or emulsion makeup cosmetic, which contains (A) metal oxide particles having a minor axis D50 of 90 to 140 nm and a minor axis D90/D10 of 2.1 or less, and (B) a clay mineral, and does not contain microplastic beads or volatile cyclic silicones.
• the metal oxide particles are preferably contained in an amount of 2 to 30% by mass relative to 100% of the total mass of the makeup cosmetic, and the metal oxide particles are preferably coated with a hydrophobic treatment agent selected from the group consisting of fatty acid soap, alkoxysilane, dimethicone, methylhydrogensiloxane, acylamino acid, and sugar fatty acid ester.
• a hydrophobic treatment agent selected from the group consisting of fatty acid soap, alkoxysilane, dimethicone, methylhydrogensiloxane, acylamino acid, and sugar fatty acid ester.
• the clay mineral is contained in an amount of 0.25 to 5% relative to 100% of the total mass of the makeup cosmetic.
• the oil-based or emulsion makeup cosmetic preferably further contains (C) an iron oxide selected from yellow, red, or black iron oxide.
• the oil-based or emulsion makeup cosmetic is preferably an oil-based or water-in-oil type makeup cosmetic.
• the oil-based or emulsion makeup cosmetic further contains white pigment titanium dioxide, and it is preferable that the white pigment titanium dioxide is contained in an amount of 5% by mass or less relative to 100% of the total mass of the makeup cosmetic.
• the present invention makes it possible to provide an oil-based or emulsion makeup cosmetic that does not contain metal oxides with small particle sizes that pose safety concerns, microplastics that are difficult to decompose in the environment, or volatile cyclic silicones, and that has excellent stability over time, good spreadability, uniform finish, and matte texture on the skin.
• the present invention relates to an oil-based or emulsion makeup cosmetic.
• the makeup cosmetic in the present invention refers to a cosmetic that aesthetically adjusts the surface condition of keratin such as skin and hair, and in the present invention refers to a cosmetic that adjusts light reflection and color by using metal oxide powder.
• the oil-based cosmetic refers to a cosmetic that is liquid, paste, or solid at room temperature (1 to 30°C) and is made by dispersing a powder base in an oil base made of fats, oils, wax, etc.
• the emulsion cosmetic refers to a cosmetic that is liquid, cream, or solid at room temperature and may be either water-in-oil (W/O) type or oil-in-water (O/W) type, and refers to an emulsion in which an aqueous component and an oily component are emulsified by an emulsifier.
• W/O water-in-oil
• O/W oil-in-water
• cosmetics the oil-based or emulsion makeup cosmetic may be omitted and simply referred to as "cosmetics”.
• the cosmetic composition according to the present invention is a cosmetic composition that contains the following (A) and (B) as essential components, and may further contain optional components.
• the cosmetic composition according to the present invention does not contain either microplastic beads or volatile cyclic silicones.
• microplastic beads are understood to mean “synthetic, water-insoluble solid plastic particles less than 5 mm in size that are intentionally incorporated into personal care products for the purpose of exfoliation and cleansing.”
• MPB refers to MPB in the narrow sense described above, as well as solid organic synthetic polymer spherical particles less than 5 mm in size that have traditionally been incorporated in cosmetics to improve their usability, such as powders and fibers of nylon, acrylic esters, polyethylene, polystyrene, polyethylene terephthalate, polyurethane, organopolysiloxane, and partially crosslinked organopolysiloxane.
• Naturally derived polymers such as cellulose and inorganic polymers such as silica do not fall under the category of MPB.
• Volatile cyclic silicones are cyclic molecules that do not exist in nature and have a cyclic Si-O skeleton. Cyclic silicones are also called cyclomethicones. Volatile cyclic silicones that are not included in the cosmetic of the present invention are cyclic compounds in which the number of silicon atoms that make up the siloxane skeleton is 3 or more and 6 or less.
• particles with a short diameter of 100 nm or less constitute 50% by mass or less.
• the particles referred to here means the essential component A described below, and all particle components that may be optionally included. Even if any fine particles are included in addition to component A, this is to avoid nanoparticles and ensure safety for the living body. More specifically, when particles with a short diameter of 60 nm or less are included, it is preferable that the maximum amount is 5% by mass, and more preferably less than 1% by mass.
• Component (A) is a metal oxide particle group having a predetermined particle size and particle size distribution, and is a metal oxide particle group that is white under visible light (wavelength 380 nm to 780 nm). Specifically, the metal oxide particle group has a minor axis median diameter (D50) of 90-140 nm and a minor axis D90/D10 of 2.1 or less. D10 refers to the minor axis that is 10% cumulative from the fine particle side of the cumulative particle size distribution of the metal oxide particle group.
• D90 refers to the minor axis that is 90% cumulative from the fine particle side of the cumulative particle size distribution of the metal oxide particle group.
• D10, D50, or D90 refers to the minor axis value unless otherwise specified as the major axis.
• a metal oxide particle group that satisfies the condition of component (A) is referred to as a "metal oxide fine particle".
• the shape of the metal oxide fine particles is not particularly limited, but may be, for example, a bale-shaped, spindle-shaped, or spherical shape, and the major axis may be approximately three times or less than the minor axis. Therefore, the major axis and the minor axis may be almost the same.
• the metal oxide microparticles according to the present invention are advantageous in that, when blended into cosmetics, they maintain UV protection effects while raising safety concerns, and can impart a matte finish without imparting an unnatural gloss.
• D50 is less than 90 nm
• the cosmetic contains many ultrafine particles with a particle size of 60 nm or less, raising safety concerns for the human body.
• there are disadvantages to the cosmetic containing many ultrafine particles such as an unnatural gloss, low matte finish, and a tendency for the cosmetic to become uneven.
• D50 is more than 140 nm and less than 200 nm, there are also disadvantages such as a tendency for the cosmetic to become uneven and stability to decrease.
• the minor axis D50 is preferably 95 to 130 nm, and more preferably 100 to 115 nm.
• the minor axis D90/D10 is preferably 2.1 or less, more preferably 1.8 or less, and even more preferably 1.4 or less.
• the compound constituting the metal oxide fine particles that are white under visible light may be, for example, titanium oxide ( TiO2 ), zinc oxide (ZnO), aluminum oxide ( Al2O3 ), magnesium oxide (MgO), and/or cerium oxide ( CeO2 ).
• TiO2 , ZnO, or a mixture thereof is preferred.
• Iron oxide does not fall under the category of metal oxides of component A.
• the metal oxide fine particles may be particles that are substantially composed of only metal oxide and have no surface coating.
• the metal oxide fine particles may be particles that are coated with a surface treatment agent.
• the surface treatment agent may be an inorganic compound such as aluminum hydroxide, or a hydrophobic treatment agent containing an organic component.
• Metal oxide fine particles coated with a hydrophobic treatment agent may be advantageously used in oil-based or emulsion cosmetics because they can suppress uneven distribution of oily components in the skin grooves and make the oily film of the cosmetic uniform.
• hydrophobic treatment agent one or more compounds selected from the group consisting of fatty acid soap, alkoxysilane, dimethicone, methylhydrogensiloxane, acylamino acid, and sugar fatty acid ester can be used.
• a surface treatment agent such as a hydrophobic treatment agent.
• the metal oxide fine particles may contain a mixture of TiO2 and ZnO.
• D50 and D10/D90 may be within the above range.
• the preferred blending amount is within the above range, and the mixing ratio (mass ratio) of TiO2 and ZnO is not particularly limited and can be any ratio.
• the mass ratio of TiO2 to ZnO can be, for example, 1: 9 to 9:1, preferably 1:4 to 2:1, but is not limited to this range.
• Clay Mineral Clay minerals are included as an essential component of cosmetics, and function as a component that stabilizes the cosmetics and imparts a suitable matte finish.
• Clay minerals refer to a type of colloidal hydrated aluminum silicate having a three-layer structure, and a compound represented by the following general formula (1) or a modified form thereof can be used.
• X is one or more selected from Al, Fe(III), Mn(III), Cr(III), or may be absent
• Y is one or more selected from Mg, Fe(II), Ni, Zn, and Li, or may be absent
• Z is one or more selected from K, Na, and Ca, or may be absent
• a is 2 to 3 and b is 0 to 2.
• (X, Y) means that X and Y are mixed in the mineral crystal.
• Si, Al means that Si and Al are mixed in the mineral crystal.
• organically modified clay minerals obtained by exchanging the cations with a quaternary ammonium salt-type cationic surfactant are also referred to as clay minerals in this specification.
• clay minerals obtained by modifying the compound represented by the above formula with a quaternary ammonium salt-type cationic surfactant are representative, but are not limited to these.
• Specific examples include organically modified smectites such as dimethyl distearyl ammonium hectorite (disteardimonium hectorite), benzyl dimethyl stearyl ammonium hectorite, dimethyl distearyl ammonium bentonite, and magnesium aluminum silicate treated with distearyl dimethyl ammonium chloride.
• the clay mineral may be one type, or may be a mixture of two or more types.
• the content of the clay mineral in component (B) is preferably 0.25 to 5 mass% when the total mass of the cosmetic is 100%. If the clay mineral content is less than 0.25 mass%, the uniformity and stability of the cosmetic may be poor. If it exceeds 5 mass%, the uniformity and stability of the cosmetic may be reduced, and the matte feel of the cosmetic may be reduced.
• the clay mineral content is more preferably 0.3 to 3 mass%. By setting it in this range, the uniformity, stability, and matte feel of the cosmetic when applied are improved. The clay mineral content is even more preferably 0.6 to 2.5 mass%. By setting it in this range, a cosmetic that is well-balanced in all of the uniformity, stability, and matte feel of the cosmetic when applied can be obtained.
• the content of the clay mineral in component (B) is preferably 0.6 to 5 mass% when the total mass of the cosmetic is taken as 100%. If the clay mineral content is less than 0.6 mass%, the uniformity and stability of the cosmetic may be poor. If it exceeds 5 mass%, the uniformity and stability of the cosmetic may also be reduced, and the matte feel of the cosmetic may also be reduced. It is more preferable that the clay mineral content is 0.7 to 3 mass%. By setting it in this range, the uniformity, stability, and matte feel of the cosmetic when applied are improved. It is even more preferable that the clay mineral content is 0.8 to 2.5 mass%. By setting it in this range, a cosmetic that is well-balanced in terms of uniformity, stability, and matte feel when applied can be obtained.
• the cosmetic of the present invention can be obtained, and in particular, it is possible to obtain a cosmetic that has good stability and spreadability, and has an excellent matte finish with moderate gloss, without using any components with particle sizes of 60 nm or less that are hazardous to the human body, microplastic beads that are harmful to the environment, or volatile cyclic silicones.
• the components that may be optionally included.
• Iron oxide Iron oxide is a powder component that functions as a coloring component in cosmetics.
• the iron oxide one or more types selected from yellow iron oxide (iron oxide yellow), red iron oxide (iron oxide red), and black iron oxide (iron oxide black) can be used, and the amount ratio of these three types of iron oxide can be changed and used in appropriate combination according to the desired color development of the cosmetic.
• the iron oxide may be particles that are substantially composed of iron oxide alone and are not surface-coated.
• the iron oxide may be coated iron oxide particles coated with a surface treatment agent. The surface treatment of the iron oxide can be performed mainly for the purpose of uniform application of the cosmetic and stabilization of the preparation.
• the coated iron oxide may be iron oxide coated with a hydrophobic treatment agent, similar to the metal oxide fine particles of component (A).
• the iron oxide that is not surface-coated or coated with a surface treatment agent can be one having an average minor axis of, for example, 1000 nm or less and more than 60 nm, but is not limited to one having a specific minor axis as long as it functions as a coloring component.
• component (C) When component (C) is included, its content can be, for example, 13% by mass or less, assuming the total mass of the cosmetic to be 100%. If the iron oxide content exceeds 13% by mass, the stability is reduced and the color may be too dark, impairing the makeup properties.
• the iron oxide content can be, for example, 0.3 to 10% by mass, and is preferably 0.5 to 6% by mass. Note that iron oxide is an optional component, and may not be included in lotions, milky lotions, creams, foundations, lipsticks, etc., if the appearance or application state of the cosmetic is aesthetically impaired.
• Volatile oil is a liquid component that makes it easy to spread in cosmetics when applied, and at least a part of it evaporates after application, making it possible to achieve a finish with less glossiness due to oil.
• a volatile acyclic silicone oil a volatile hydrocarbon oil, a volatile ester oil, or a combination thereof can be used. Volatile cyclic silicone oil is not included in the volatile oil of (D).
• one or more selected from dimethylpolysiloxane, methyltrimethicone, isododecane, undecane, tridecane coconut oil methyl ester, coconut oil ethyl ester, palm oil methyl ester, palm oil ethyl ester, palm oil butyl ester, butyl acetate, ethyl acetate, etc. can be used, but are not limited thereto.
• component (D) when included, its content can be, for example, 60% by mass or less, when the total mass of the cosmetic is 100%. If the volatile oil is included in an amount of more than 60% by mass, the stability of the cosmetic may be reduced.
• the content of the volatile oil can be, for example, 2 to 40% by mass, and is preferably 8 to 20% by mass.
• the volatile oil is an optional component, and in cases where the product is sufficiently easy to spread in relation to the form of the product and other components, where there is a lot of powder and therefore the glossiness is low, where the glossiness is low when solidified with wax or the like, or where the stability of the formulation is deteriorated by blending a volatile component because the product is not filled in a sealed container, the desired properties can be exhibited without including a volatile oil.
• the white pigment titanium oxide of component (E) may be titanium oxide having a larger minor axis D50 than the metal oxide fine particles of component (A), with the minor axis D90/D10 being greater than 2.1, and more specifically, may be titanium oxide having a minor axis D50 of, for example, 200 nm or more, preferably 200 to 300 nm.
• the white pigment titanium oxide may also be surface-coated titanium oxide, as with the metal oxide fine particles of component (A), or may be surface-coated with a hydrophobic treatment agent, and the shape is not particularly limited, and may be, for example, spherical, spindle-shaped, blocky, or needle-shaped.
• component (E) When component (E) is included, its content can be, for example, 11% by mass or less, and preferably 5% by mass or less, when the total mass of the cosmetic is taken as 100%. If the white pigment titanium dioxide is contained in an amount of more than 11% by mass, the cosmetic becomes too white, impairing the makeup properties and causing the cosmetic to sink into the unevenness of the skin and not achieve a uniform finish.
• the content of the white pigment titanium dioxide can be more preferably 0.3 to 5% by mass, and can be 0.5 to 2% by mass.
• white pigment titanium dioxide is an optional component, and may not be included in lotions, milky lotions, creams, foundations, lipsticks, etc., if this aesthetically impairs the appearance or application of the cosmetic, or if component (A) is present at 30% by mass.
• the water-in-oil emulsion foundation was prepared by mixing oily components, optionally including component D, among the components shown in Tables 1 to 5 below, in a disperser, and further adding and dispersing the powders containing component A, component B, and optionally component C prepared by the method above, to the resulting mixture, and adding an aqueous phase in which the water-soluble components were dissolved in water separately, and emulsifying by stirring.
• Matte skin feel means that the skin surface state after application of the cosmetic is less glossy due to diffuse reflection of light, and the higher the rating, the lower the rating ... and the higher the rating, the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the higher the rating, and the
• ⁇ in vitro SPF> "Evaluation Method" A sample of each example was dropped onto a PMMA plate (Helioplate HD6 manufactured by Helioscreen) in an amount of 2 mg/ cm2 , applied with a finger for 60 seconds, and dried for 15 minutes to form a coating film. Using an uncoated plate as a control, the absorbance (290-450 nm) of the coating film was measured using a UV2000S analyzer manufactured by Labsphere, and the in vitro SPF (Sun Protection Factor) value was calculated from the obtained measurement data.
• PMMA plate Helioplate HD6 manufactured by Helioscreen
• the cosmetic compositions according to the present invention do not contain microplastic beads or volatile cyclic silicones, and by minimizing the content of metal oxide particles with a short diameter of 60 nm or less, they were able to achieve a uniform finish, good spreadability, and lack of luster, similar to conventional compositions containing microplastic beads and volatile cyclic silicones.
• the other examples do not contain particles with a short diameter smaller than that of component A, and it can be said that particles with a short diameter of 60 nm or less are substantially not contained or are less than 1%.
• a cosmetic composition was obtained that can achieve a particularly high SPF value by using an ultraviolet scattering effect without using an ultraviolet absorber.
• Formulation examples of the cosmetics of the present invention are given below.
• the method of preparing the cosmetics according to each formulation example was as follows. ⁇ Production Method> (Formulation Examples 1, 3, 5, 6, and 13)
• a cosmetic composition having the composition shown in the examples was prepared by dissolving and mixing the aqueous components in water using a disperser, heating to 70°C, adding a mixture of the oily components and powder that had been separately heated to 80°C, and emulsifying by stirring.
• a cosmetic composition having the composition shown in the examples was prepared by mixing the oily component in a disperser, adding and dispersing the powder into the mixture, adding an aqueous phase component prepared by dissolving the water-soluble component in water, and emulsifying the mixture by stirring.
• composition having the composition shown in the examples was prepared by adding a powder to an oil phase that had been dissolved by heating to 80°C or higher, dispersing the powder in the oil phase, adding an aqueous phase component that had been prepared by dissolving and mixing the aqueous component in water and heating to 80°C or higher, and emulsifying by stirring.
• compositions shown in the examples were prepared by heating the oily components to 80°C or higher, mixing and dissolving them using a disperser, and dispersing the powder in the mixture, which was then filled into a container or mold and cooled.
• None of the cosmetics in the following formulation examples 1 to 13 contain fine particles with a D50 smaller than that of ingredient A, and all of the cosmetics in the formulation examples are able to solve the problems of the present invention without using ingredients that have been used conventionally, and are cosmetics with a uniform finish, excellent stability, and an in vitro SPF of 15 or more.

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• 2023
  • 2023-10-11 JP JP2024561669A patent/JP7799352B2/ja active Active
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