Oil-in-water emulsion cosmetic composition

Abstract

Provided is a novel oil-in-water emulsion cosmetic composition containing two or more kinds of emulsified particles.　The oil-in-water emulsion cosmetic composition contains first emulsified particles, second emulsified particles different from the first emulsified particles, and water. The first emulsified particles are stabilized by solid particles adsorbed at the interface of the oil phase and water phase. The first emulsified particles include a first fragrance component, and the second emulsified particles include a second fragrance component different from the first fragrance component.

Description

Oil-in-water emulsion cosmetic composition

[0001] The present invention relates to an oil-in-water emulsion cosmetic composition.

[0002] Emulsification technology is an essential technology for preparing cosmetic compositions, as it allows mixing of water and oil, which are essential as substances for providing or replenishing the skin, but which do not mix with each other.

[0003] Known types of emulsion cosmetic compositions include oil-in-water emulsions and water-in-oil emulsions. These emulsion cosmetic compositions generally contain one type of emulsion particle, but may contain two or more types of emulsion particle.

[0004] For example, Patent Document 1 discloses a composite emulsion composition containing various emulsion particle sizes, the emulsion composition comprising giant emulsion particles of 1 μm to 100 μm and nanoemulsion particles of 100 nm to 900 nm, the giant emulsion particles comprising an amphiphilic anisotropic powder, the amphiphilic anisotropic powder comprising a first polymer spheroid which is hydrophilic and a second polymer spheroid which is hydrophobic, the first polymer spheroid and the second polymer spheroid being bonded to each other by a structure which at least partially penetrates each other, the first polymer spheroid having a core-shell structure, and the shell containing a functional group.

[0005] Special table 2018-506517 publication

[0006] However, there are still many unexplored areas in research on emulsion cosmetic compositions containing two or more types of emulsion particles.

[0007] The present invention is intended to improve the above-mentioned circumstances, and its object is to provide a novel oil-in-water emulsion cosmetic composition containing two or more types of emulsion particles.

[0008] The present invention that achieves the above object is as follows.

[0009] Aspect 1: An oil-in-water emulsion cosmetic composition comprising first emulsion particles, second emulsion particles different from the first emulsion particles, and water, wherein the first emulsion particles are stabilized by solid particles adsorbed to the interface between the oil phase and the water phase, the first emulsion particles comprise a first fragrance component, and the second emulsion particles comprise a second fragrance component different from the first fragrance component. Aspect 2: The composition according to Aspect 1, wherein the solid particles comprise at least one type of particle selected from the group consisting of organic fine particles and inorganic fine particles. Aspect 3: The composition according to Aspect 2, wherein the organic fine particles are core-corona type polymer fine particles. Aspect 4: The composition according to Aspect 3, wherein the core-corona type polymer fine particles are (acrylamide / acrylates / methoxy PEG methacrylate) copolymer fine particles or (acrylates / acrylalkyl (C10-30)) crosspolymer fine particles. Aspect 5: The composition according to any one of Aspects 1 to 4, wherein the second emulsion particles are emulsion particles emulsified with a surfactant or oil capsules. Aspect 6: The average particle size R of the first emulsion particles １ and the average particle size R of the second emulsified particles. ２ and the composition according to any one of aspects 1 to 5, satisfying the following formula (I) or formula (II): １ / R ２ <0.1 Formula (I) R １ / R ２ >10 Formula (II) Aspect 7 The composition according to any one of Aspects 1 to 6, wherein the content of the first emulsion particles is 5 to 70% by mass, based on the total mass of the composition. Aspect 8 The composition according to any one of Aspects 1 to 7, wherein the content of the second emulsion particles is 1 to 30% by mass, based on the total mass of the composition. Aspect 9 The composition according to any one of Aspects 1 to 8, which causes a change in scent to be sensed upon application.

[0010] According to the present invention, it is possible to provide a novel oil-in-water emulsion cosmetic composition containing two or more types of emulsion particles.

[0011] Furthermore, the present invention can also provide an oil-in-water emulsion cosmetic composition that can cause a change in scent to be felt upon application.

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the preferred embodiments. However, the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0013] <Oil-in-water emulsion cosmetic composition> The oil-in-water emulsion cosmetic composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") comprises first emulsion particles, second emulsion particles different from the first emulsion particles, and water, wherein the first emulsion particles are stabilized by solid particles adsorbed to the interface between the oil phase and the aqueous phase, the first emulsion particles contain a first fragrance component, and the second emulsion particles contain a second fragrance component different from the first fragrance component.

[0014] The composition of the present invention contains first emulsion particles and second emulsion particles different from the first emulsion particles, but the first emulsion particles and the second emulsion particles coexist independently and stably. Specifically, the composition of the present invention suppresses fluctuations in the size of these emulsion particles or coalescence between the first emulsion particles and the second emulsion particles. Furthermore, the composition of the present invention suppresses separation, precipitation, creaming, and the like of the emulsion particles, and also suppresses the Ostwald ripening phenomenon.

[0015] Without being limited by theory, it is speculated that this is due to the effect that the first emulsion particles contained in the composition of the present invention are stabilized by solid particles adsorbed at the interface between the oil phase and the aqueous phase.That is, the first emulsion particles stabilized in this way have a thicker interface film than emulsion particles stabilized by ordinary surfactants, thereby ensuring a distance between the oil phases of adjacent emulsion particles, thereby preventing the emulsion particles from mixing together.As a result, it is speculated that the above-mentioned fluctuation in emulsion particle size, coalescence between emulsion particles, separation, precipitation, and creaming of emulsion particles, as well as the occurrence of Ostwald ripening, can be prevented.

[0016] In the composition of the present invention, the first emulsion particles contain a first fragrance component, and the second emulsion particles contain a second fragrance component different from the first fragrance component. Furthermore, when the composition of the present invention is applied to the skin, the timing at which the first emulsion particles disintegrate and the timing at which the second emulsion particles disintegrate tend to differ. In particular, the first emulsion particles, which are stabilized by solid particles adsorbed to the interface between the oil phase and the aqueous phase, tend to disintegrate earlier than the second emulsion particles. Therefore, the composition of the present invention can cause a change in fragrance to be perceived when applied to the skin, etc.

[0017] Each component that may be contained in the composition of the present invention will be described in detail below.

[0018] <First Emulsion Particles> The composition of the present invention contains first emulsion particles.

[0019] In the composition of the present invention, the average particle size of the first emulsion particles is not particularly limited and may be, for example, 500 nm or more, 800 nm or more, 1 μm or more, 5 μm or more, or 10 μm or more, or 100 μm or less, 80 μm or less, 60 μm or less, 40 μm or less, or 20 μm or less. In the present invention, the average particle size of the emulsion particles can be determined by observation with an optical microscope when it is 1 μm or more, and can be determined by, for example, dynamic light scattering when it is less than 1 μm.

[0020] In the composition of the present invention, the average particle size R of the first emulsified particles １ and the average particle size R of the second emulsified particles described later. ２ and preferably satisfy the following formula (I) or formula (II): １ / R ２ <0.1 Formula (I) R １ / R ２ >10 Formula (II)

[0021] In the above formula (I), R １ / R ２ is a number less than 0.1, and may be, for example, 0.09 or less, 0.05 or less, 0.01 or less, or 0.005 or less. １ / R ２ The lower limit of R is not particularly limited. １ / R ２ may be 0.0001 or more, or 0.001 or more.

[0022] In the above formula (II), R １ / R ２ is a number greater than 10, and may be, for example, 11 or more, 20 or more, 50 or more, 100 or more, or 1000 or more. １ / R ２ There is no particular upper limit to the value of R １ / R ２ may be 5000 or less, or 2000 or less.

[0023] In the composition of the present invention, the content of the first emulsion particles is not particularly limited and may be, for example, 5% by mass or more, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, or 50% by mass or more, based on the total mass of the composition, and may be 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, or 30% by mass or less. Note that, in the present invention, the content of the emulsion particles refers to the total amount of the oil phase and emulsifier blended in the composition.

[0024] In the composition of the present invention, the primary emulsion particles are stabilized by solid particles adsorbed to the interface between the oil phase and the aqueous phase.

[0025] Therefore, the first emulsified particles according to the present invention may be substantially free of common surfactants, and may be formed, for example, by so-called "Pickering emulsification" (also called "Pickering emulsion").

[0026] In the present invention, the solid particles may comprise at least one particle selected from the group consisting of organic fine particles, inorganic fine particles, and organic-inorganic composite fine particles. In the present invention, the term "fine particles" refers to particles having an average particle diameter of 30 nm or more, 50 nm or more, or 100 nm or more, and 1 μm or less, 800 nm or less, 500 nm or less, or 400 nm or less, as measured by dynamic light scattering measurement, laser diffraction / scattering method, or the like. Furthermore, such fine particles may be inorganic or organic.

[0027] (Organic Fine Particles) In the present invention, examples of organic fine particles include, but are not limited to, core-corona type polymer fine particles, latex particles, and polyion complex particles. Core-corona type polymer fine particles are polymer fine particles having both a skeleton (core) portion that is compatible with oil and a peripheral (corona) portion that is compatible with water. Core-corona type polymer fine particles may be, for example, a microgel in which hydrophilic groups are partially provided on the surface of hydrophobic gel fine particles. Latex particles are fine particles formed of resin and have a size of approximately several tens of nanometers to several tens of micrometers. Polyion complex particles are fine particles formed by the electrostatic action that occurs when a positively charged polymer and a negatively charged polymer are mixed in an aqueous solution.

[0028] In the composition of the present invention, the solid particles are preferably core-corona type polymer fine particles, from the viewpoint of being able to emulsify oil at a relatively low concentration and thereby imparting a better feel to the composition when used.

[0029] In the present invention, the core-corona type polymer fine particles can be obtained by radical polymerization of monomers represented by the following formulas (1) to (3), or (1), (2) and (4), under specific conditions.

[0030] In addition, in formula (1), R １ represents alkyl having 1 to 3 carbon atoms, n is a number from 8 to 200, and X is H or CH ３ Represents.

[0031] The polyethylene oxide macromonomer represented by the above formula (1) is preferably an acrylic acid derivative or a methacrylic acid derivative. For example, a commercially available product such as a product sold by Aldrich or a product such as Blemmer (registered trademark) sold by NOF Corporation can be used. For example, methoxypolyethylene glycol monomethacrylates PME-400, PME-1000, and PME-4000 (n=9, n=23, and n=90 in formula (1), respectively, all manufactured by NOF Corporation) may be used.

[0032] In addition, in formula (2), R ２ represents alkyl having 1 to 3 carbon atoms, R ３ represents an alkyl group having 1 to 12 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms.

[0033] The hydrophobic monomer represented by the above formula (2) is preferably an acrylic acid derivative or a methacrylic acid derivative, and examples thereof include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, decyl acrylate, dodecyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, decyl methacrylate, and dodecyl methacrylate. Among these, methyl methacrylate (also known as methyl methacrylate), butyl methacrylate (also known as butyl methacrylate), and octyl methacrylate are particularly suitable. These hydrophobic monomers are general-purpose raw materials and can be easily obtained as general industrial raw materials. For example, commercially available products from Aldrich or Tokyo Chemical Industry Co., Ltd. may be used.

[0034] In addition, in formula (3), R ４ and R ５ each independently represents alkyl having 1 to 3 carbon atoms, and m is a number from 0 to 2.

[0035] The crosslinking monomer represented by formula (3) is available as a commercial product or an industrial raw material. This crosslinking monomer is preferably hydrophobic. Specifically, it is preferable to use ethylene glycol dimethacrylate (hereinafter sometimes abbreviated as EGDMA) available from Aldrich, or Blemmer (registered trademark) PDE-50 available from NOF Corporation.

[0036] In addition, in formula (4), R ６ represents H or an alkyl group having 1 to 3 carbon atoms, and R ７ and R ８ each independently represents H or a substituent containing an alkyl group having 1 to 12 carbon atoms.

[0037] The hydrophobic monomer represented by the above formula (4) is preferably an acrylamide derivative or a methacrylamide derivative. For example, t-butylacrylamide, N,N-dimethylacrylamide, N-[3-(dimethylamino)propyl]acrylamide, t-butylmethacrylamide, octylacrylamide, octylmethacrylamide, octadecylacrylamide, etc. can be suitably used. Of these, t-butylacrylamide, N,N-dimethylacrylamide, and N-[3-(dimethylamino)propyl]acrylamide are particularly suitable. These hydrophobic monomers are commercially available or available as industrial raw materials.

[0038] In the present invention, the core-corona type polymer microparticles may be obtained by radically polymerizing the monomers of the above formulas (1) to (3) under the following conditions (A) to (E):

[0039] (A) The molar ratio represented by the molar amount of polyethylene oxide macromonomer charged / the molar amount of hydrophobic monomer charged is 1:10 to 1:250. (B) The amount of crosslinkable monomer charged is 0.1 to 1.5% by mass relative to the amount of hydrophobic monomer charged. (C) The hydrophobic monomer represented by formula (2) is a monomer composition comprising one or more methacrylic acid derivatives having an alkyl group having 1 to 8 carbon atoms. (D) The polymerization solvent is a water-organic solvent mixed solvent, and when a polyol is used as the organic solvent, one or more polyols selected from dipropylene glycol, 1,3-butylene glycol, and isoprene glycol are used. (E) The solvent composition of the water-organic solvent mixed solvent is water:organic solvent=90-10:10-90 by mass at 20°C.

[0040] In the present invention, the "charged amount of crosslinkable monomer relative to the charged amount of hydrophobic monomer" is defined as the crosslink density (% by mass). The crosslink density of the core-corona type polymer microparticles of the present invention is preferably such that the charged amount of crosslinkable monomer is 0.1 to 1.5% by mass relative to the charged amount of hydrophobic monomer, depending on the condition (B).

[0041] Under the above condition (A), the molar ratio of the polyethylene oxide macromonomer to the hydrophobic monomer can be polymerized in the range of 1:10 to 1:250 (molar ratio), preferably 1:10 to 1:200, more preferably 1:25 to 1:100.

[0042] Under the condition (B), a microgel in which the hydrophobic polymer in the core portion is crosslinked can be polymerized by copolymerizing a crosslinkable monomer. The amount of the crosslinkable monomer is preferably 0.2 to 1.0 mass%, more preferably 0.2 to 0.8 mass%, and most preferably 0.2 to 0.5 mass%.

[0043] In the above condition (C), the hydrophobic monomer represented by formula (2) is preferably a monomer composition containing one or more methacrylic acid derivatives each having an alkyl group having 1 to 8 carbon atoms.

[0044] In the above condition (D), the polymerization solvent is preferably a mixed solvent of water and an organic solvent. Ethanol, propanol, butanol, polyol, etc. can be used as the organic solvent. When a polyol is used, it is preferable that the polyol be capable of dissolving the hydrophobic monomer represented by formula (2) and the crosslinkable monomer represented by formula (3). The polyol used in the present invention is preferably dipropylene glycol, 1,3-butylene glycol, or isoprene glycol. Furthermore, when considering that the polymerization solution can be used directly as a raw material without requiring a purification step such as dialysis, it is preferable that the polyol be a polyol that can be generally incorporated into cosmetics.

[0045] In the above condition (E), the solvent composition of the water-organic solvent mixed solvent that is the polymerization solvent is preferably water:organic solvent = 90 to 10:10 to 90 in mass ratio at 20°C. The solvent composition of the water-organic solvent mixed solvent is preferably water:organic solvent = 90 to 10:10 to 90 (volume ratio at 20°C), and more preferably water:organic solvent = 80 to 20:20 to 80 (volume ratio at 20°C). Furthermore, it is preferable to add an organic solvent to the polymerization solvent in order to uniformly dissolve the hydrophobic monomer. The mixing ratio of the organic solvent is preferably 10 to 90 by volume.

[0046] In the present invention, the core-corona type polymer microparticles may be obtained by radically polymerizing the monomers of the above formulas (1), (2), and (4) under the following conditions (A') to (E'):

[0047] (A') the molar ratio represented by the molar amount of polyethylene oxide macromonomer charged / the molar amount of (acrylate derivative monomer and / or acrylamide derivative monomer) charged is 1:10 to 1:250; (B') the macromonomer represented by formula (1) is an acrylic acid derivative or methacrylic acid derivative having a polyethylene glycol group with 8 to 200 repeating units, the acrylate derivative monomer represented by formula (2) is an acrylic acid derivative or methacrylic acid derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms, and the acrylamide derivative monomer represented by formula (3) is an acrylamide derivative or methacrylamide derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms; (C') the polymerization solvent is a water-alcohol mixed solvent, and the alcohol is one or more selected from ethanol, dipropylene glycol, 1,3-butylene glycol, and isoprene glycol. (D') The solvent composition of the water-alcohol mixed solvent is, in mass ratio at 20°C, water:alcohol=90-10:10-90.

[0048] Under the above condition A', the molar amounts of the polyethylene oxide macromonomer and the hydrophobic monomer (i.e., the total of the acrylate derivative monomer and / or the acrylamide derivative monomer) charged can be polymerized within a molar ratio of polyethylene oxide macromonomer:hydrophobic monomer = 1:10 to 1:250, preferably 1:10 to 1:200, and more preferably 1:25 to 1:100.

[0049] The above condition (B') consists of three conditions (B-1)' to (B-3)': (B-1)' The macromonomer represented by formula (1) is an acrylic acid derivative or methacrylic acid derivative having 8 to 200 repeating units and a polyethylene glycol group. If the repeating units are 7 or less, particles stably dispersed in a solvent may not be obtained, and if the repeating units exceed 200, the particles may become too fine and unstable when incorporated into a cosmetic. (B-2)' The acrylate derivative monomer represented by formula (2) is an acrylic acid derivative or methacrylic acid derivative having a substituent containing an alkyl group having 1 to 12 carbon atoms. If the carbon number is 0 (a monomer without a terminal ester bond), the monomer may be too hydrophilic and may not undergo emulsion polymerization successfully. On the other hand, if the carbon number is 13 or more, a desirable feel during use may not be obtained. (B-3)' The acrylamide derivative monomer represented by formula (3) is an acrylamide derivative or methacrylamide derivative having a substituent containing an alkyl group having 1 to 18 carbon atoms.

[0050] The hydrophobic monomer according to the present invention must be a monomer composition containing one or a mixture of two or more monomers selected from the group consisting of acrylate derivative monomers represented by the above formula (2) and acrylamide derivative monomers represented by the above formula (3).

[0051] In the present invention, it is particularly preferred to use two types of hydrophobic monomers, methyl methacrylate and butyl methacrylate, or four types, methyl methacrylate, t-butylacrylamide, N,N-dimethylacrylamide, and N-[3-(dimethylamino)propyl]acrylamide, as the hydrophobic monomer. In these combinations of hydrophobic monomers, it is also preferred to use methoxypolyethylene glycol monomethacrylate as the macromonomer. Furthermore, the most preferred combinations of macromonomers and hydrophobic monomers in the present invention include, but are not limited to, the following: methoxypolyethylene glycol monomethacrylate, methyl methacrylate, and butyl methacrylate, each having 8 to 90, and most preferably 15, repeating units of the polyethylene glycol group; and methoxypolyethylene glycol monomethacrylate, methyl methacrylate, butyl methacrylate, t-butylacrylamide, N,N-dimethylacrylamide, and N-[3-(dimethylamino)propyl]acrylamide, t-butylmethacrylamide, octylacrylamide, octylmethacrylamide, and octadecylacrylamide, each having 8 to 200, and most preferably 90, repeating units of the polyethylene glycol group.

[0052] In the above condition (C'), the polymerization solvent is preferably a water-alcohol mixed solvent. The alcohol is preferably one that can dissolve the hydrophobic monomers represented by formulas (2) and (3). Therefore, one or more selected from ethanol, dipropylene glycol, 1,3-butylene glycol, and isoprene glycol are suitable.

[0053] In the above condition (D'), the solvent composition of the water-alcohol mixed solvent, which is the polymerization solvent, is preferably water:alcohol=90-10:10-90, more preferably water:alcohol=80-20:20-80, in mass ratio at 20°C.

[0054] In the present invention, the polymerization initiator used in the polymerization system can be a commercially available polymerization initiator used in ordinary water-soluble thermal radical polymerization. In this polymerization system, even if polymerization is carried out without strict control of the stirring conditions, the polymerized microgel particles can have an extremely narrow particle size distribution.

[0055] The microgel used in the present invention is thought to be formed by ordering of hydrophilic macromonomers and hydrophobic monomers in a solvent, resulting in the formation of core-corona type polymer microparticles with a nearly uniform particle size and crosslinked core portions.

[0056] In the present invention, the core-corona type polymer microparticles may be, more specifically, (acrylamide / acrylates / methoxy PEG methacrylate) copolymer microparticles or (acrylates / acrylic alkyl (C10-30)) crosspolymer microparticles, and are preferably (acrylamide / acrylates / methoxy PEG methacrylate) copolymer microparticles.

[0057] (Inorganic fine particles) In the present invention, inorganic fine particles include, but are not limited to, metal oxide fine particles and carbonate fine particles.Metal oxide fine particles include, but are not limited to, silica, zinc oxide, titanium oxide, alumina, ceria, zirconia, etc.Carbonate fine particles include, but are not limited to, calcium carbonate, strontium carbonate, barium carbonate, magnesium carbonate, cobalt carbonate, etc.

[0058] Furthermore, the inorganic fine particles may be those whose surfaces have been treated with a surface treatment agent, if necessary. For example, surface-treated inorganic fine particles such as silica-coated zinc oxide, trimethylsilane-treated silica-coated zinc oxide, and hydrophobized silica may be used as the inorganic fine particles.

[0059] In the present invention, the concept of inorganic fine particles may include fine particles whose surface is modified with an organic compound using an inorganic particle as a core, fine particles obtained by polymerizing a monomer having a site modified with an organic functional group and an inorganic polymerizable site in the molecule, and fine particles whose inorganic component is chemically modified with an organic functional group. Examples of such inorganic fine particles include, but are not limited to, amodimethicone-treated metal oxide fine particles.

[0060] It should be noted that "amodimethicone" is an INCI (International Nomenclature of Cosmetic Ingredients) name, and is a type of amino-modified silicone, and may be an aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer.

[0061] More specifically, amodimethicone may be, for example, a compound represented by the following general formula (5):

[0062] In the above formula (5), R １ is selected from divalent hydrocarbon groups having 1 to 8 carbon atoms, n is a number from 1 to 5, and R ２ is selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms; R ３ represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R １ -NH(CH ２ ) ｎ -NH ２ a and b are each a number of 1 or more, and a+b is a number average of 2 or more and less than 2,000; １ , R ２ , and R ３ may be the same or different groups, and (SiR ２ ２ O) unit and (SiR ２ (R １ -NH(CH ２ ) ｎ -NH ２ 0) Units may be block or random.

[0063] R in the above formula (5) １ is a divalent hydrocarbon group having 1 to 8 carbon atoms. １ The carbon number of the hydrocarbon group may be 2 to 6, and particularly may be 3 or 4. Specifically, R １ may be, for example, a divalent group selected from a 1,2-propylene group, a 1,3-propylene group, an isobutylene group, a 2-methyl-1,3-propylene group, and the like.

[0064] R in the above formula (5) ２ is a monovalent group selected from a hydroxyl group and a monovalent hydrocarbon group having 1 to 20 carbon atoms. ２ When R is a hydrocarbon group, it may have 1 to 12 carbon atoms, 1 to 6 carbon atoms, or 1 to 4 carbon atoms. ２ may be, for example, a group selected from a methyl group and an ethyl group.

[0065] R in the above formula (5) ３ represents a monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, a hydroxyl group, and a group R １ -NH(CH ２ ) ｎ -NH ２ R is a monovalent group selected from ２ When is a hydrocarbon group or an alkoxyl group, the number of carbon atoms may be 1 to 12, 1 to 6, or 1 to 4. The hydrocarbon group may specifically be, for example, a group selected from a methyl group and an ethyl group, and the alkoxyl group may specifically be, for example, a group selected from a methoxyl group and an ethoxyl group.

[0066] In the above formula (5), a+b may be 20 or more, or 30 or more, and may be less than 1,000.

[0067] The amino equivalent of amodimethicone may be 200 g / mol or more, 500 g / mol or more, or 600 g / mol or more, and may be 30,000 g / mol or less, 20,000 g / mol or less, 15,000 g / mol or less, 10,000 g / mol or less, or 5,000 g / mol or less. This amino equivalent is a value defined as the mass of the siloxane skeleton per amino group or ammonium group.

[0068] The viscosity of amodimethicone is expressed as a kinematic viscosity at 25°C. ２ / s or more, 200mm ２ / s or more, 300mm ２ / s or more, 500mm ２ / s or more, or 700 mm ２ / s or more, and ２ / s or less, 2,500mm ２ / s or less, 2,000mm ２ / s or less, 1,800mm ２ / s or less, 1,500mm ２ / s or less, or 1,300 mm ２ / s or less.

[0069] The metal oxide fine particles related to the amodimethicone-treated metal oxide fine particles may be, for example, fine zinc oxide, fine iron oxide, fine titanium oxide, fine alumina, fine tin oxide, fine cerium oxide, fine strontium oxide, or the like, and may be one or more selected from these. Among these, for example, fine zinc oxide is preferred.

[0070] The average primary particle diameter of the amodimethicone-treated metal oxide microparticles may be less than 80 nm, 60 nm or less, 50 nm or less, 40 nm or less, or 30 nm or less, or may be 5 nm or more, 10 nm or more, 15 nm or more, or 20 nm or more.

[0071] (First Fragrance Component) In the composition of the present invention, the first emulsified particles contain a first fragrance component.

[0072] Fragrance components refer to substances that humans perceive as smells, and may also be called "fragrance components." Specific examples of fragrance components include acetibenol, anisaldehyde, anethole, amyl acetate, amyl salicylate, allyl amyl glycolate, allyl caproate, aldehydes C6-20, ambrettolide, ambroxan, ionone, isoe super, eugenol, auranthiol, galaxolide, calone, coumarin, geraniol, geranyl acetate, sandaloa, santalol, sandera, cyclamen aldehyde, cis-3-hexenyl acetate, and cis-3-hexenol. , Citral, Citronellyl Acetate, Citronellol, 1,8-Cineole, Dihydromyrcenol, Jasmolactone, Cinnamic Alcohol, Cinnamic Aldehyde, Styrallyl Acetate, Cedryl Acetate, Cedrol, Damascone, Damascenone, Decalactone, Terpinyl Acetate, Terpineol, Tonalid, Tripluran, Nerol, Bacdanol, Vanillin, Hydroxycitronellal, Phenylethyl Acetate, Phenylethyl Alcohol, Hexyl Salicylate, Vetiveryl Acetate, Hedione, Heliotropin, Helional, Vertofix, Benzyl Acetate, Benzyl Salicylate, Benzyl Benzoate, Pentalid, Pentalid, Bornyl Acetate, Myall, Musk Ketone, Methyl Anthranilate, Methyl Dihydrojasmonate, Yara Yara, Lime Oxide, Linalyl Acetate, Linalool, Limonene, Lyral, Lilial, Rose Oxide, Rhodinol, Angelica Oil, Anise Oil, Armoire Oil, Basil Oil, Bay Oil, Bergamot Oil , calamus oil, camphor oil, cananga oil, cardamom oil, cassia oil, cedarwood oil, celery oil, chamomile oil, cinnamon oil, clove oil, coriander oil, hyssop oil, cumin oil, dill oil, elemi oil, estragon oil, eucalyptus oil, fennel oil, fenugreek oil, galbanum oil, geranium oil, ginger oil, grapefruit oil, guaiac wood oil, cypress oil, hinoki oil, juniper berry oil,Lavandin oil, lavender oil, lemon oil, lime oil, mandarin oil, ziram oil, fir oil, peppermint oil, spearmint oil, mill oil, myrtle oil, nutmeg oil, oakmoss oil, olibanum oil, opoponax oil, orange oil, parsley oil, patchouli oil, pepper oil, perilla oil, petitgrain oil, neroli oil, orange flower oil, pimento oil, allspice oil, pine oil, rose oil, rosemary oil, clary sage oil, sage oil, sandalwood oil, styrax oil, tagetes oil, thyme oil, chutney oil Examples of such an oil include, but are not limited to, bellows oil, valerian oil, vetiver oil, violet leaf oil, wintergreen oil, wormwood oil, ylang-ylang oil, yuzu oil, cassius absolute, genet absolute, hyacinth absolute, inmortelle absolute, jasmine absolute, jasmine sambac oil, Japanese mint oil, jonquil absolute, narcissus absolute, rose absolute, violet leaf absolute, benzoin, ethyl-4-methoxybenzoate, whiskey lactone, ethyl anisate, and methyl methoxybenzoate.

[0073] In the composition of the present invention, the first fragrance component can be classified in the oil phase, emulsified by the above-mentioned solid particles, and present in a form in which it is encapsulated in the first emulsified particles.

[0074] In the composition of the present invention, the content of the first fragrance component is not particularly limited, and may be, for example, 0.001% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.05% by mass or more, or 0.08% by mass or more, based on the total mass of the composition, and may be 10% by mass or less, 5.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, 0.1% by mass or less, or 0.08% by mass or less.

[0075] <Second Emulsified Particles> The composition of the present invention contains second emulsified particles. The second emulsified particles are different from the first emulsified particles described above. The second emulsified particles preferably differ from the first emulsified particles in the type of emulsifier and / or the average particle size of the emulsified particles, more preferably differ from the first emulsified particles in the average particle size of the emulsified particles, and particularly preferably differ from the first emulsified particles in the type of emulsifier and the average particle size of the emulsified particles.

[0076] In the composition of the present invention, the average particle size of the second emulsified particles is not particularly limited and may be, for example, 30 nm or more, 100 nm or more, 500 nm or more, 1 μm or more, 3 μm or more, 5 μm or more, or 1 mm or more, and may be 2 mm or less, 1 mm or less, 100 μm or less, 10 μm or less, 500 nm or less, or 100 nm or less.

[0077] In the composition of the present invention, the content of the second emulsified particles is not particularly limited, and may be, for example, 1% by mass or more, 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more, based on the total mass of the composition, and may be 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, 10% by mass or less, or 5% by mass or less.

[0078] In the composition of the present invention, the second emulsified particles may be, for example, emulsified particles emulsified with a surfactant or oil capsules.

[0079] (Second Emulsified Particles Emulsified with Surfactant) In the composition of the present invention, the surfactant is not particularly limited, and for example, a nonionic surfactant, an ionic surfactant, or an amphoteric surfactant may be used.

[0080] The ionic surfactant may be any surfactant capable of forming an interfacial film of oil droplets, and may be anionic, cationic, or amphoteric ionic surfactants. Among these, anionic surfactants are preferred from the viewpoint of emulsion stability, etc.

[0081] The anionic surfactant may be, but is not limited to, at least one of carboxylate, sulfonate, sulfate, and phosphate salts, and among these, it is preferable to use a sulfonate salt, which is less susceptible to electrostatic shielding by electrolytes. The salt form is not particularly limited, and examples thereof include alkali metal salts such as sodium salts, potassium salts, and lithium salts, alkaline earth metal salts such as magnesium salts and calcium salts, ammonium salts, and amino acid salts.

[0082] As the sulfonate-type anionic surfactant, for example, N-acylmethyl taurine salts can be used, and for example, stearoyl methyl taurine salts, lauroyl methyl taurine salts, myristoyl methyl taurine salts, coconut oil fatty acid methyl taurine salts, etc. can be suitably used.

[0083] The nonionic surfactant may be any surfactant capable of forming an interfacial film of oil droplets, and is not particularly limited. For example, a hydrophilic nonionic surfactant having an HLB of 15.0 or more, 15.5 or more, or 16.0 or more can be used. When such a hydrophilic nonionic surfactant is used in a cosmetic preparation, the user is more likely to feel a rich sensation when using the preparation. Here, HLB is a value that generally indicates the affinity of a surfactant for water and oil, and is a parameter known as the hydrophilic-lipophilic balance, and can be easily determined by known calculation methods, such as the Griffin method.

[0084] The nonionic surfactant is not limited to the following, but specific examples include at least one of polyoxyethylene alkyl ethers, polyglycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene lanolin / lanolin alcohol / beeswax derivatives, polyoxyethylene castor oil / hydrogenated castor oil, polyoxyethylene sterol / hydrogenated sterol, polyethylene glycol fatty acid esters, and polyoxyethylene glyceryl isostearate.

[0085] Examples of polyoxyethylene alkyl ethers include polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene behenyl ether, and polyoxyethylene stearyl ether, with polyoxyethylene behenyl ether and polyoxyethylene stearyl ether being preferred. Specific examples include POE (15) cetyl ether (HLB 15.5), POE (20) cetyl ether (HLB 17.0), POE (23) cetyl ether (HLB 18.0), POE (20) stearyl ether (HLB 18.0), POE (21) stearyl ether (HLB value 18.0), POE (15) oleyl ether (HLB 16.0), POE (20) oleyl ether (HLB 17.0), POE (50) oleyl ether (HLB 18.0), POE (20) behenyl ether (HLB 16.5), POE (30) behenyl ether (HLB 18.0), POE (10) (C12-15) alkyl ether (HLB 15.5), and the like, and among these, POE (30) behenyl ether is preferred. An example of a commercially available polyoxyethylene alkyl ether is NIKKOL (trademark) BB-30 (manufactured by Nikko Chemicals Co., Ltd.) etc. Here, POE means a polyoxyethylene group, and the number in parentheses following POE means the average number of moles of polyoxyethylene groups added in the compound.

[0086] The average number of moles of polyoxyethylene groups added in the polyoxyethylene alkyl ether is preferably 20 or more, 21 or more, 25 or more, or 30 or more from the viewpoints of emulsion stability, transparency, etc.

[0087] When a surfactant is used in the composition of the present invention, the content thereof is not particularly limited and may be set appropriately depending on the type of surfactant and the type of emulsification, and may be, for example, 0.05 mass% or more, 0.1 mass% or more, 0.5 mass% or more, or 1.0 mass% or more, based on the total mass of the composition, and may be 10 mass% or less, 5.0 mass% or less, 1.0 mass% or less, 0.5 mass% or less, 0.1 mass% or less, or 0.08 mass% or less.

[0088] In the composition of the present invention, when the second emulsified particles are emulsified particles emulsified with a surfactant, the emulsification may be normal emulsification or high-pressure emulsification. High-pressure emulsification is a method of preparing emulsified particles by high-pressure emulsification of a mixed liquid under a pressure of 50 MPa or more. The pressure of the high-pressure emulsification may be, for example, 50 MPa or more, 80 MPa or more, or 100 MPa or more, or 300 MPa or less.

[0089] When high-pressure emulsification is employed, the second emulsion particles may contain an ionic surfactant, a nonionic surfactant, a higher alcohol, and an oil component, and in this case, the ionic surfactant, the nonionic surfactant, and the higher alcohol may form an interfacial film of the second emulsion particles.

[0090] Any higher alcohol may be used as long as it can form an interfacial film of oil droplets together with the above-mentioned ionic surfactant and nonionic surfactant, but from the viewpoint of emulsion stability, etc., it is preferable to use a higher alcohol that can form a solid or α-gel interfacial film together with the ionic surfactant and nonionic surfactant at room temperature or higher, such as a higher alcohol that is solid at room temperature. Here, room temperature means a temperature in the range of 5°C to 35°C.

[0091] As such higher alcohols, for example, those having a carbon chain length of 16 or more can be used, and specific examples include linear or branched higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, monostearyl glycerin ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc. Among these, from the viewpoint of usability and the like, higher alcohols having a linear saturated alkyl group having 18 or more or 19 or more carbon atoms are preferred, and behenyl alcohol is particularly preferred.

[0092] (Oily Capsules) In the composition of the present invention, when the second emulsified particles are oily capsules, the oily capsules can contain, for example, (A1) a solid oil component and (A2) a liquid oil component.

[0093] Examples of (A1) solid oil components include solid paraffin, microcrystalline wax, ceresin, beeswax, varico wax, polyethylene wax, silicone wax, higher alcohols (e.g., behenyl alcohol, stearyl alcohol, cetyl alcohol, etc.), batyl alcohol, carnauba wax, beeswax, candelilla wax, jojoba wax, lanolin, shellac wax, spermaceti, Japan wax, higher fatty acids (e.g., myristic acid, palmitic acid, stearic acid, behenic acid, 12-hydroxystearic acid, etc.), ester oils (e.g., myristyl myristate, etc.), cacao butter, hydrogenated castor oil, hydrogenated oils, hydrogenated palm oil, palm oil, hydrogenated coconut oil, polyethylene, petrolatum, various hydrogenated animal and vegetable oils and fats, and fatty acid monocarboxylic acid lanolin alcohol esters.

[0094] From the viewpoint of stability at high temperatures, the melting point of the solid oil component (A1) is preferably 50° C. or higher, more preferably 55° C. or higher, and even more preferably 65° C. or higher. From the viewpoint of particle formability and dispersibility, the melting point is preferably 85° C. or lower. More preferred examples of the solid oil component (A1) include hydrogenated jojoba oil (melting point: 68°C), glyceryl behenate eicosandioate (melting point: 66°C), higher alcohols having 16 or more carbon atoms, preferably 18 or more carbon atoms, such as stearyl alcohol (melting point: 52 to 62°C) and behenyl alcohol (melting point: 68°C), microcrystalline wax (melting point: 80°C), ceresin (melting point: 68 to 75°C), polyethylene wax (melting point: 80°C), batyl alcohol (melting point: 70°C), carnauba wax (melting point: 83°C), candelilla wax (melting point: 71°C), hydrogenated castor oil (melting point: 84°C), stearic acid (melting point: 58 to 63°C), behenic acid (melting point: 69 to 80°C), and 12-hydroxystearic acid (melting point: 70°C).

[0095] The component (A1) can be blended in one type or two or more types. In the composition of the present invention, when the second emulsified particles are oil capsules, the blending amount of the component (A1) may be, for example, 5 to 50 mass % or 10 to 20 mass % relative to the total amount of the oil capsules.

[0096] In the present invention, the term "liquid oil" refers to an oil that is liquid at room temperature (25°C).

[0097] (A2) Examples of liquid oils include linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, apricot kernel oil, cinnamon oil, jojoba oil, grape oil, almond oil, rapeseed oil, sesame oil, sunflower oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, triglycerin, glycerin trioctanoate, glycerin triisopalmitate, coconut oil, palm oil, palm kernel oil, and other fats and oils; octanoic acid esters such as cetyl octanoate; and isooctanoic acid esters such as glycerin tri-2-ethylhexaenoate and pentaerythrityl tetraethylhexanoate. ester oils such as esters of hexyl laurate, lauric acid esters such as isopropyl myristate and octyldodecyl myristate, palmitic acid esters such as octyl palmitate, stearic acid esters such as isocetyl stearate, isostearic acid esters such as isopropyl isostearate, isopalmitic acid esters such as octyl isopalmitate, oleic acid esters such as isodecyl oleate, adipic acid diesters such as diisopropyl adipate, sebacate diesters such as diethyl sebacate, and diisostearyl malate, Examples of the silicone oil include hydrocarbon oils such as liquid paraffin, ozokerite, squalane, squalene, pristane, paraffin, isoparaffin, and petrolatum; chain silicones such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane (phenylmethicone), and methylhydrogenpolysiloxane; cyclic silicones such as decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane; and silicone oils containing modified silicones such as amino-modified silicone oil, polyether-modified silicone oil, carboxy-modified silicone oil, alkyl-modified silicone oil, ammonium salt-modified silicone oil, and fluorine-modified silicone oil.

[0098] Among the above oils, polar oils such as glycerin tri-2-ethylhexaenoate and pentaerythrityl tetraethylhexanoate are preferred because they can impart a moist feeling to the skin in addition to the good skin-compatibility due to the presence of oil capsules. Silicone oil is also preferred because it can impart a moist feeling and smooth feeling to the skin in addition to the good skin-compatibility due to the presence of oil capsules.

[0099] The component (A2) can be blended in one type or two or more types. In the composition of the present invention, when the second emulsified particles are oil capsules, the blending amount of the component (A2) may be, for example, 50 to 95% by mass, or 60 to 90% by mass, based on the total amount of the oil capsules.

[0100] The average particle size of the oil capsules may be, for example, 100 μm or more, preferably 100 μm to 1.5 mm, and more preferably 100 μm to 1 mm. The particle size of the oil capsules can be measured using a microscope.

[0101] (Second Fragrance Component) In the composition of the present invention, the second emulsified particles contain a second fragrance component that is different from the above-described first fragrance component.

[0102] Therefore, the second aroma component can be selected from the above-mentioned first aroma components so as to be different from the first aroma component used.

[0103] In the composition of the present invention, the second fragrance component can be classified into the oil phase and can be present in a form that is encapsulated in the second emulsified particles.

[0104] In the composition of the present invention, the content of the second fragrance component is not particularly limited, and may be, for example, 0.001% by mass or more, 0.005% by mass or more, 0.01% by mass or more, 0.05% by mass or more, or 0.08% by mass or more, based on the total mass of the composition, and may be 10% by mass or less, 5.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, 0.1% by mass or less, or 0.08% by mass or less.

[0105] Examples of the first aroma components include sage oil, pepper oil, estragon oil, fennel oil, grapefruit oil, hyssop oil, coriander oil, juniper berry oil, and methyl methoxybenzoate. Examples of the second aroma components include jasmine sambac oil, Japanese mint oil, thyme oil, ethyl 4-methoxybenzoate, 1,8-cineole, whiskey lactone, ethyl anisate, rose oil, and patchouli oil.

[0106] <Water> The composition of the present invention contains water.

[0107] In the present invention, the water is not particularly limited, but water used in cosmetics, quasi-drugs, etc. can be used, such as purified water, ion-exchanged water, tap water, etc.

[0108] The amount of water to be added is not particularly limited, but from the viewpoint of emulsion stability, for example, it is preferably 50 to 95% by mass, and more preferably 70 to 90% by mass, of the total amount of the composition.

[0109] <Other Oil Phase Components> The composition of the present invention may further optionally contain other oil phase components (for example, oil, etc.).

[0110] The oil component is not limited to the following, but for example, at least one of liquid oils and fats, solid oils and fats, waxes, hydrocarbon oils, synthetic ester oils, and the like can be used.

[0111] Examples of liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0112] Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hardened coconut oil, palm oil, beef tallow, mutton tallow, hardened beef tallow, palm kernel oil, lard, beef bone fat, Japan wax kernel oil, hardened oil, beef trotter fat, Japan wax, and hardened castor oil.

[0113] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, Ibota wax, whale wax, montan wax, bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0114] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, olefin oligomer, isododecane, and isohexadecane.

[0115] Examples of synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, Glyceryl tri-2-ethylhexanoate, glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptyl palmitate lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0116] <Other Aqueous Phase Components> The composition of the present invention may optionally contain other aqueous phase components (for example, water-soluble alcohols, etc.).

[0117] Examples of water-soluble alcohols include lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, dihydric alcohol alkyl ethers, dihydric alcohol alkyl ethers, dihydric alcohol ether esters, glycerin monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides, and derivatives thereof, which may be used alone or in combination.

[0118] <Further Additive Components> The composition of the present invention may contain various components other than those described above, as appropriate, depending on the intended use of the composition, as long as the effects of the present invention are not adversely affected. Examples of such components include additives that are typically incorporated into cosmetics, such as powders such as talc; moisturizing agents such as polyethylene glycol; water-soluble polymers such as plant-based polymers, starch-based polymers, and vinyl-based polymers; coating agents such as anionic coating agents, cationic coating agents, and nonionic coating agents; ultraviolet absorbers such as benzoic acid-based ultraviolet absorbers; sequestering agents such as 1-hydroxyethane-1,1-diphosphonic acid; amino acids such as neutral amino acids and basic amino acids, and salts or derivatives thereof; organic amines such as monoethanolamine; and polymer emulsions such as acrylic resin emulsions. Examples of suitable anti-inflammatory agents include hydroxybenzoates, ...

[0119] <Uses of the Composition of the Present Invention> The composition of the present invention can be used as a product that gives off a change in scent when applied.

[0120] Furthermore, the composition of the present invention can be made transparent or translucent depending on the application, and can also provide a pleasant, rich feeling when applied to the skin.

[0121] Therefore, the composition of the present invention exhibiting such properties can be used, for example, as a base for cosmetics, particularly as a base for cosmetics to be applied to the skin. Here, cosmetics to be applied to the skin can also include those called external preparations for the skin.

[0122] The product form of the composition of the present invention is not particularly limited, and examples thereof include skin care cosmetics such as lotion, serum, emulsion, cream, gel, and pack; makeup cosmetics such as foundation, lipstick, and eye shadow; sunscreen cosmetics (sunscreen agents); body cosmetics; aromatic cosmetics; skin cleansers such as makeup removers and body shampoos; hair cosmetics such as hair liquids, hair tonics, hair conditioners, shampoos, rinses, and hair growth agents; ointments, etc.

[0123] <Method for Producing the Composition of the Present Invention> The method for producing the composition of the present invention is not particularly limited, and may be, for example, a method including the following steps (a) to (c).

[0124] That is, the method for producing the composition of the present invention may include: (a) preparing first emulsion particles; (b) preparing second emulsion particles; and (c) mixing the first emulsion particles and the second emulsion particles.

[0125] Here, the order of steps (a) and (b) is not particularly limited, and step (b) may be performed after step (a), step (b) may be performed after step (a), or step (a) and step (b) may be performed simultaneously.

[0126] After step (a) (or step (b)), step (b) (or step (a)) and step (c) may be carried out simultaneously. For example, the second emulsion particles may be prepared in a composition in which the first emulsion particles have been prepared, and then mixed therewith.

[0127] (Step (a)) In step (a), first emulsion particles are prepared. This step may be carried out appropriately depending on the type of solid particles used to form the first emulsion particles.

[0128] For example, when core-corona type polymer microparticles, which are organic microparticles, are used as solid particles, the core-corona type polymer microparticles can be added to ion-exchanged water to which various aqueous phase components such as polyols and thickeners have been added, followed by stirring and mixing. A separately uniformly dissolved oil phase component is then added, and the mixture is shear-mixed with a homomixer until uniform, thereby forming the desired emulsified particles.

[0129] (Step (b)) In step (b), second emulsion particles are prepared. This step may be carried out appropriately depending on the type of emulsion of the second emulsion particles described above.

[0130] For example, when the second emulsion particles are oil capsules, the above-mentioned components (A1) and (A2) are adjusted to a temperature above their melting points to form a liquid. These components are then introduced into an aqueous solvent adjusted to substantially the same temperature as the components (A1) and (A2) under stirring. Stirring can be performed at a relatively slow speed, specifically 10 to 1,500 rpm (preferably 20 to 300 rpm), using a propeller or paddle mixer. Introduction into the aqueous solvent can be performed, for example, using an injection means such as a liquid pump, preferably by direct injection from the bottom of the aqueous solvent. By introducing the components into the aqueous solvent under stirring in this manner, liquid particles can be formed in the aqueous solvent. Next, the mixture of the aqueous solvent and the components is further cooled to room temperature under stirring, causing the solid oil, which has reached or below its melting point, to precipitate on the particle surface. This results in the formation of oil capsules with an average particle size of 100 μm or more in the aqueous solvent. Furthermore, a second aroma component can be encapsulated in the oil capsules by emulsifying it as an oil phase component.

[0131] (Step (c)) In the step (c), the first emulsified particles and the second emulsified particles are mixed together.

[0132] More specifically, the first emulsified particles and the second emulsified particles are generally uniformly dispersed in a medium, but it is also preferable that they are mixed in a state where they are contained in an aqueous solvent. The order of mixing is not particularly limited. The mixing is performed at a temperature at which the first emulsified particles and the second emulsified particles do not decompose, for example, at room temperature. The stirring conditions during mixing are also not particularly limited, but it is preferable to mix them under conditions that do not destroy the first emulsified particles and the second emulsified particles.

[0133] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. Unless otherwise specified, the blending amounts are expressed in mass %.

[0134] Examples 1 and 2, and Comparative Example 1 Oil-in-water emulsion compositions of Examples 1 and 2, and Comparative Example 1 were each prepared.

[0135] More specifically, based on the constitution of the first emulsified particles shown in Table 1-1 and the constitution of the second emulsified particles shown in Table 1-2, the composition of Example 1 was prepared as follows.

[0136] Step a: Various aqueous phase components such as alcohols, polyols, and thickeners listed in Table 1-1 below were added and mixed in ion-exchanged water, to which core-corona type polymer microparticles were added and mixed. Separately, oil phase components containing aroma components that had been uniformly dissolved were added, and the mixture was shear-mixed using a homomixer until uniform, to obtain an oil-in-water composition containing first emulsion particles.

[0137] Step b: The solid and liquid oily components shown in Table 1-2 below were heated to a liquid state. These were then added dropwise to an aqueous solvent adjusted to the same temperature as the heated components, while stirring with a propeller (200 rpm). This mixture was cooled to room temperature while stirring, and the solid oil components, which had reached or below their melting point, precipitated on the particle surfaces, yielding an oil-in-water composition containing second emulsion particles.

[0138] Step c: The emulsions obtained in steps a and b were mixed by propeller stirring.

[0139] In Example 1, the content of the first emulsion particles was 9.48 mass % based on the total mass of the composition, and the content of the second emulsion particles was 3.8 mass % based on the total mass of the composition.

[0140]

[0141]

[0142] Based on the constitution of the first emulsified particles shown in Table 1-3 and the constitution of the second emulsified particles shown in Table 1-4, the composition of Example 2 was prepared as follows.

[0143] Step a: Various aqueous phase components such as polyols and thickeners listed in Tables 1-3 below were added to ion-exchanged water, to which core-corona type polymer microparticles were added and mixed. Separately, oil phase components containing aroma components that had been uniformly dissolved were added, and the mixture was shear-mixed using a homomixer until uniform, to obtain an oil-in-water composition containing first emulsion particles.

[0144] Step b: The solid and liquid oily components listed in Tables 1-4 below were heated to a liquid state. These were then added to an aqueous solvent adjusted to the same temperature, and pre-emulsified using a homomixer. This mixture was subjected to high-pressure treatment using a high-pressure homogenizer (100 MPa x 5 passes). The resulting composition was then cooled to room temperature to obtain an oil-in-water composition containing second emulsion particles.

[0145] Step c: The emulsions obtained in steps a and b were mixed by propeller stirring.

[0146] In Example 2, the content of the first emulsion particles was 21.08 mass % based on the total mass of the composition, and the content of the second emulsion particles was 2.54 mass % based on the total mass of the composition.

[0147]

[0148]

[0149] The composition of Comparative Example 1 was prepared in the same manner as in Example 1, except that sage oil (0.08% by mass) and jasmine sambac oil (0.02% by mass) were used as the first fragrance component, the second fragrance component was not blended, and the remaining amount was adjusted with ion-exchanged water.

[0150] The average particle sizes of the first emulsified particles and the second emulsified particles of each of the prepared compositions were evaluated by optical microscope observation (particles of 1 μm or more) and dynamic light scattering (particles of less than 1 μm) using an Olympus Corporation optical microscope, and the results are shown in Table 2. In addition, the two-stage scent change of each composition was evaluated by a panel of experts, and the evaluation criteria were as follows, and the evaluation results are shown in Table 2.

[0151] <Evaluation of two-stage scent change> "A": The initial scent was detected upon application, and then a scent different from the initial scent was detected at an interval of 10 seconds or more; "B": The initial scent was detected upon application, and then a scent different from the initial scent was detected at an interval of 5 seconds or more but less than 9 seconds; "C": No change in scent was detected.

[0152]

Claims

1. An oil-in-water emulsion cosmetic composition comprising first emulsion particles, second emulsion particles different from the first emulsion particles, and water, wherein the first emulsion particles are stabilized by solid particles adsorbed to the interface between the oil phase and the water phase, the first emulsion particles contain a first fragrance component, and the second emulsion particles contain a second fragrance component different from the first fragrance component.

2. The composition according to claim 1, wherein the solid particles comprise at least one type of fine particles selected from the group consisting of organic fine particles and inorganic fine particles.

3. The composition of claim 2, wherein said organic microparticles are core-corona type polymeric microparticles.

4. The composition of claim 3, wherein the core-corona type polymer microparticles are (acrylamide / acrylates / methoxy PEG methacrylate) copolymer microparticles or (acrylates / acrylic alkyl (C10-30)) crosspolymer microparticles.

5. The composition according to claim 1, wherein the second emulsified particles are emulsified particles emulsified with a surfactant or oil capsules.

6. The average particle size R of the first emulsified particles １ and the average particle size R of the second emulsified particles. ２ and the composition according to claim 1, wherein R satisfies the following formula (I) or formula (II): １ / R ２ <0.1 Formula (I) R １ / R ２ >10 Formula (II) 7. The composition according to claim 1, wherein the content of the first emulsion particles is 5 to 70% by mass based on the total mass of the composition.

8. The composition according to claim 1, wherein the content of the second emulsified particles is 1 to 30% by mass, based on the total mass of the composition.

9. The composition according to any one of claims 1 to 8, which causes a change in scent to be felt upon application.

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