Oil-based emulsions in water

Abstract

The present invention provides an oil-in-water emulsion composition that can suppress the re-aggregation of hydrophobically treated pigments in the oil phase and achieve good stability at high temperatures. [Solution] The oil-in-water emulsion composition of the present invention has an aqueous phase and an oil phase. In the oil-in-water emulsion composition of the present invention, the aqueous phase contains (A) a pigment hydrophobized with a hydrophobic treatment agent and (B) a polyether-modified silicone with an HLB value of 6.0 or higher, and the oil phase contains (C) a polyether-modified silicone with an HLB value of less than 6.0 and (D) a nonionic surfactant with an HLB value of 14.0 or higher, thereby emulsifying the aqueous and oil phases. The oil-in-water emulsion composition of the present invention satisfies the following relational formula (1): 1.10 ≤ Mass of component A / (Mass of component B + Mass of component C) ≤ 5.50 … (1).

Description

Technical Field

[0001] The present invention relates to a water-in-oil type emulsion composition.

Background Art

[0002] As disclosed in Patent Documents 1 to 7, emulsion compositions containing hydrophobized pigments are known. In particular, Patent Documents 1 to 6 disclose water-in-oil type emulsion compositions containing hydrophobized pigments in the aqueous phase.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a water-in-oil type emulsion composition, it is desired to suppress the re-aggregation of hydrophobized pigments in the aqueous phase. For example, in the field of cosmetics, in order to apply pigments uniformly, it is desired to suppress the re-aggregation of hydrophobized pigments in the aqueous phase in a water-in-oil type emulsion composition.

[0005] Furthermore, in oil-in-water emulsion compositions containing hydrophobized pigments in the aqueous phase, stability at high temperatures (e.g., 50°C) is desired. For example, in the field of cosmetics, stability at high temperatures is desired in oil-in-water emulsion compositions containing hydrophobized pigments in the aqueous phase in order to maintain quality.

[0006] The present invention aims to provide an oil-in-water emulsion composition that can suppress the re-aggregation of hydrophobically treated pigments in the oil phase and achieve good stability at high temperatures. [Means for solving the problem]

[0007] The inventors of this case have found that the above problem can be solved by the following means. <Aspect 1> Aqueous phase, and Oil phase It has, The aqueous phase, (A) Pigments treated with a hydrophobic treatment agent, and (B) Polyether-modified silicone with an HLB value of 6.0 or higher Includes, The oil phase is (C) Polyether-modified silicone with an HLB value of less than 6.0 Includes, (D) The aqueous phase and the oil phase are emulsified with a nonionic surfactant with an HLB value of 14.0 or higher, The following relationship (1) is satisfied: Oil-in-water emulsion composition: 1.10 ≤ Mass of component A / (Mass of component B + Mass of component C) ≤ 5.50 … (1). <Aspect 2> Furthermore, the oil-in-water emulsion composition according to Embodiment 1 satisfies the following relation (2): 1.50 ≤ Mass of component A / Mass of component B < 40.0 … (2). <Aspect 3> Furthermore, the oil-in-water emulsion composition according to embodiment 1 or 2 satisfies the following relational expression (3): 1.00 ≤ mass of component C / mass of component B ≤ 7.00 … (3). <Aspect 4> An oil-in-water type emulsion composition according to any one of Aspects 1 to 3, further satisfying the following relational expression (4): 0.20 ≤ mass of component D / (mass of component B + mass of component C) < 1.00 … (4). <Aspect 5> An oil-in-water type emulsion composition according to any one of Aspects 1 to 4, wherein the HLB value of component B is 6.0 or more and 15.0 or less. <Aspect 6> An oil-in-water type emulsion composition according to Aspect 5, wherein component B is PEG-12 dimethicone. <Aspect 7> An oil-in-water type emulsion composition according to any one of Aspects 1 to 6, wherein the HLB value of component C is 3.0 or more and less than 6.0. <Aspect 8> An oil-in-water type emulsion composition according to Aspect 7, wherein component C is PEG-10 dimethicone. <Aspect 9> An oil-in-water type emulsion composition according to any one of Aspects 1 to 8, wherein the HLB value of component D is 14.0 or more and 18.0 or less. <Aspect 10> An oil-in-water type emulsion composition according to Aspect 9, wherein component D is glyceryl isostearate PEG-60. <Aspect 11> An oil-in-water type emulsion composition according to any one of Aspects 1 to 10, wherein the hydrophobizing agent is an alkylsilane, a fatty acid or its salt, an ester oil, an acyl amino acid or its salt, or a combination thereof. <Aspect 12> An oil-in-water type emulsion composition according to Aspect 11, wherein the hydrophobizing agent is triethoxycaprylylsilane, stearate, isostearyl sebacate, disodium stearoyl glutamate, sodium stearoyl glutamate, and sodium dilauramidoglutamidoricin.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide an oil-in-water type emulsion composition that can achieve both suppression of re-aggregation of hydrophobically treated pigments in an aqueous phase and good stability at high temperatures.

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail. Note that the present invention is not limited to the following embodiments and can be variously modified and implemented within the scope of the gist of the disclosure.

[0010] <<Oil-in-Water Type Emulsion Composition>> The oil-in-water type emulsion composition of the present invention has an aqueous phase and an oil phase. In the oil-in-water type emulsion composition of the present invention, the aqueous phase contains (A) a pigment hydrophobically treated with a hydrophobizing agent and (B) a polyether-modified silicone having an HLB value of 6.0 or more, and the oil phase contains (C) a polyether-modified silicone having an HLB value of less than 6.0, and (D) the aqueous phase and the oil phase are emulsified by a nonionic surfactant having an HLB value of 14.0 or more. The oil-in-water type emulsion composition of the present invention satisfies the following relational expression (1): 1.10 ≦ mass of component A / (mass of component B + mass of component C) ≦ 5.50... (1).

[0011] The inventors of the present case have found that when an oil-in-water type emulsion composition containing a hydrophobically treated pigment in an aqueous phase is treated under predetermined conditions, the pigment may re-aggregate.

[0012] ​​​​In contrast, the inventors of this case have found that in an oil-in-water emulsion composition in which an aqueous phase containing (A) a pigment hydrophobized with a hydrophobic treatment agent and (B) a polyether-modified silicone with a relatively high HLB value, and an oil phase containing (C) a polyether-modified silicone with a relatively low HLB value, are emulsified with (D) a predetermined nonionic surfactant, and the value of mass of component A / (mass of component B + mass of component C) is within a predetermined range, it is possible to suppress the re-aggregation of the hydrophobized pigment (component A) in the aqueous phase and achieve good stability at high temperatures.

[0014] While not intended to be bound by any particular theory, it is thought that if the amount of component B near the surface of component A in the aqueous phase is small, component C, which is normally present in the oil phase and can function as an emulsifying aid, will move to the vicinity of component A to compensate for the deficiency of component B. As a result, component C will not be able to function sufficiently as an emulsifying aid, and the high-temperature stability of the oil-in-water emulsion composition will deteriorate. In contrast, as described above, by setting the relationship between the mass of component A and the total mass of components B and C within an appropriate range, it is thought that the unintended movement of component C from the oil phase to the aqueous phase can be suppressed, thereby improving the high-temperature stability of the oil-in-water emulsion composition.

[0015] The following describes each element constituting the oil-in-water emulsion composition of the present invention.

[0016] <Aqueous phase> The oil-in-water emulsion composition of the present invention has an aqueous phase.

[0017] The aqueous phase content in the oil-in-water emulsion composition of the present invention is not particularly limited and may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 75% by mass or more, or 99% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, or 80% by mass or less.

[0018] (Component A: Pigment treated with a hydrophobicizing agent) In the oil-in-water emulsion composition of the present invention, the aqueous phase contains (A) a pigment that has been hydrophobized with a hydrophobic treatment agent.

[0019] The content of component A in the aqueous phase is not particularly limited and may be, for example, 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, or 3% by mass or more, or 10% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or 1% by mass or less.

[0020] (Pigment) The pigment is not particularly limited and may be, for example, an organic pigment, an inorganic pigment, or a combination thereof, and may be an inorganic pigment in particular.

[0021] The inorganic pigment may be a luminous pigment, a pigment other than a luminous pigment, or a combination thereof.

[0022] In relation to the present invention, a luminous pigment means a pigment that does not contain a colorant and exhibits luminosity. The luminous pigments are not particularly limited and may include, for example, titanium mica, iron oxide-coated titanium mica, carmine-coated titanium mica, carmine-ultramarine-coated titanium mica, iron oxide-carmine-treated titanium mica, ultramarine-treated titanium mica, iron oxide-ultramarine-treated titanium mica, chromium oxide-treated titanium mica, black titanium oxide-treated titanium mica, acrylic resin-coated aluminum powder, silica-coated aluminum powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass powder, polyethylene terephthalate-polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, iron oxide-coated titanium oxide mica such as red iron oxide-coated titanium oxide mica (mica coated with iron oxide and titanium oxide), hollow titanium oxide powder with silica sandwiched between the mica and titanium oxide coating layers, or combinations thereof. These typically exhibit white or other colors. The lustrous pigment may be colorless. Such lustrous pigments may be known as transparent lustrous pigments, and examples include lustrous pigments in which a film made of a high refractive index material such as titanium dioxide is formed on the surface of glass particles as a base.

[0023] Examples of inorganic pigments other than luminous pigments include inorganic white pigments (e.g., titanium dioxide, zinc oxide, cerium oxide), inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, ochre, etc.); inorganic black pigments (e.g., black iron oxide, lower titanium oxide, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); metal powders (e.g., aluminum, gold, silver, copper, etc.), etc., or combinations thereof.

[0024] The average particle size of the pigment is not particularly limited and may be, for example, between 150 nm and 700 nm. Pigments with such a particle size are prone to aggregation, but in the present invention, re-aggregation of pigments can be suppressed even with pigments of such particle size.

[0025] In relation to the present invention, the average particle diameter of the pigment refers to the value measured by measuring the particle diameter of 200 randomly selected particles using scanning electron microscopy (SEM) images and calculating the average of these particle diameters. The diameter of the smallest circumscribed circle is used to calculate the individual particle diameter. The particles measured may be primary or secondary particles.

[0026] The shape of the pigment is not particularly limited and can be spherical (including nearly spherical), rod-shaped, needle-shaped, spindle-shaped, plate-shaped, hexagonal plate-shaped, needle-shaped aggregates, amorphous shapes, etc. The shape can be observed using a scanning electron microscope or the like.

[0027] For example, if the pigment is titanium dioxide, the surface of the pigment may be coated to suppress the photocatalytic activity of the titanium dioxide. The material used to coat the titanium dioxide for this purpose may be, for example, aluminum hydroxide.

[0028] (Hydrophobic treatment agent) In the oil-in-water emulsion composition of the present invention, the hydrophobic agent is not particularly limited. For example, the hydrophobic agent may be an alkylsilane, a fatty acid or a salt thereof, an ester oil, an acyl amino acid or a salt thereof, or a combination thereof.

[0029] The alkylsilane is not particularly limited. Examples of alkylsilanes include silylation agents and silane coupling agents with introduced organic groups. In particular, the alkylsilane may be triethoxycaprylylsilane.

[0030] The fatty acid is not particularly limited. The fatty acid may be a straight-chain or branched-chain saturated or unsaturated fatty acid having 12 to 22 carbon atoms, such as lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, palmitoleic acid, behenic acid, lignoceric acid, 2-ethylhexanoic acid, isotridecanoic acid, isomyristic acid, isopalmitic acid, isostearic acid, isobéhenic acid, etc. Examples of salts include Ca, Mg, Zn, Zr, Al, Ti, etc. In particular, the fatty acid or its salt may be a stearate.

[0031] The acyl amino acid or its salt is not particularly limited. Examples of acyl amino acids include acylated compounds of saturated fatty acids having 12 to 18 carbon atoms and amino acids selected from aspartic acid, glutamic acid, alanine, glycine, sarcosine, proline, hydroxyproline, etc., or whole hydrolysates of plant-derived peptides such as wheat or peas, or silk peptides. Examples of salts include K, Na, Fe, Zn, Ca, Mg, Al, Zr, and Ti. In particular, the acyl amino acid or its salt may be disodium stearoyl glutamate, sodium stearoyl glutamate, and sodium dilauroramidoglutamidolynsin.

[0032] The ester oil is not particularly limited; for example, it may be obtained by reacting one or more alcohols having 1 to 36 carbon atoms with one or more carboxylic acids having 1 to 36 carbon atoms. In particular, the ester oil may be isostearyl sebacate.

[0033] In the oil-in-water emulsion composition of the present invention, the hydrophobic treatment agent may be triethoxycaprylylsilane, stearate, isostearyl sebacate, disodium stearoyl glutamate, sodium stearoyl glutamate, and sodium dilauramidoglutamidolin.

[0034] The ratio of the mass of the hydrophobic treatment agent to the mass of the pigment is not particularly limited and can be set appropriately considering the desired degree of hydrophobicity, etc.

[0035] The method of hydrophobic treatment is not particularly limited; for example, a pigment can be made hydrophobic by mixing a hydrophobic treatment agent with the pigment.

[0036] (Component B: Polyether-modified silicone with an HLB value of 6.0 or higher) In the oil-in-water emulsion composition of the present invention, the aqueous phase contains a polyether-modified silicone with a (B)HLB value of 6.0 or higher. The aqueous phase may contain one or more components B, and may particularly contain one component B.

[0037] Component B, a nonionic surfactant, is present on the surface of the hydrophobized pigment in the aqueous phase and at the interface between the aqueous and oil phases in the oil-in-water emulsion composition, and can suppress the re-aggregation of the hydrophobized pigment.

[0038] The HLB value of component B may be between 6.0 and 15.0. The HLB value of component B may be between 6.0 and 6.5, 7.0 and 7.5, or 8.0, and may be between 15.0, 14.0 and 13.0, 12.0 and 11.0 and 10.0 and 9.0, or 8.0, and may also be 8.0. This effectively suppresses the re-aggregation of the hydrophobized pigment.

[0039] Here, the HLB value 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. It can be easily determined by known calculation methods such as the Griffin method. Note that if the target component is a mixture of two or more components, the HLB value may be a weighted average of the HLB values ​​of each component. This also applies to components C and D, which will be discussed later.

[0040] Component B is not particularly limited as long as it is a polyether-modified silicone that satisfies the above HLB value, but for example, PEG-12 dimethicone (DOWSIL TMThe substance may be ES-5373 Formulation Aid, PEG-11 methyl ether dimethicone (KF-6011), PEG / PPG-20 / 22 butyl ether dimethicone (KF-6012), PEG-32 methyl ether dimethicone (KF-6004), and PEG-10 dimethicone (KF-6043), and in particular, the above-mentioned PEG-12 dimethicone may be used.

[0041] The content of component B in the aqueous phase is not particularly limited and may be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more, or 1% by mass or less, 0.5% by mass or less, 0.4% by mass or less, 0.3% by mass or less, 0.2% by mass or less, or 0.1% by mass or less.

[0042] (Polyols and / or ethyl alcohols) In the oil-in-water emulsion composition of the present invention, the aqueous phase may contain a polyol and / or ethyl alcohol.

[0043] The polyol is not particularly limited as long as it is one that is commonly used in cosmetics, for example, but may be glycerin, 1,3-butylene glycol, dipropylene glycol, propylene glycol, etc.

[0044] (aqueous dispersion) In the oil-in-water emulsion composition of the present invention, component A, component B, and polyol and / or ethyl alcohol may form an aqueous dispersion.

[0045] In the present invention, "aqueous dispersion" means a dispersion that is compatible with water, and therefore may or may not contain water. Furthermore, the "oil-in-water emulsion composition" of the present invention can be obtained by dispersing this "aqueous dispersion" in, for example, an oil-in-water emulsion base.

[0046] The content of component A in the aqueous dispersion is not particularly limited and may be, for example, 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, and may also be 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, or 20% by mass or less.

[0047] The content of component B in the aqueous dispersion is not particularly limited and may be, for example, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, or 5.0% by mass or more, or 10.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, or 2.0% by mass or less.

[0048] The content of polyol and / or ethyl alcohol in the aqueous dispersion is not particularly limited and may be, for example, 10% by mass or more, 20% by mass or more, 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 75% by mass or more, or 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, or 45% by mass or less. In the aqueous dispersion, the polyol and / or ethyl alcohol can function as a dispersion medium.

[0049] The aqueous dispersion may or may not contain any other components not listed above.

[0050] The aqueous dispersion can be produced, for example, by mixing component A, component B, and a polyol and / or ethyl alcohol. The method of mixing each component is not particularly limited, and conventional methods can be used.

[0051] (water) The water contained in the aqueous phase is not particularly limited, and for example, water used in cosmetics can be used. For example, ion-exchanged water, distilled water, ultrapure water, tap water, etc. can be used.

[0052] The water content in the aqueous phase is not particularly limited and may be, for example, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 75% by mass or more, or 99% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, or 75% by mass or less.

[0053] (Other ingredients) The aqueous phase may further contain components other than those mentioned above. The types and amounts of such components are not particularly limited.

[0054] The aqueous phase may or may not contain nonionic surfactants other than component B. In particular, the aqueous phase does not need to contain nonionic surfactants other than component B.

[0055] The aqueous phase may or may not contain surfactants other than nonionic surfactants. In particular, the aqueous phase does not need to contain surfactants other than nonionic surfactants.

[0056] <Oil phase> The oil-in-water emulsion composition of the present invention has an oil phase.

[0057] The oil phase content in the oil-in-water emulsion composition of the present invention 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, or 50% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, or 25% by mass or less.

[0058] (Component C: Polyether-modified silicone with an HLB value of less than 6.0) In the oil-in-water emulsion composition of the present invention, the oil phase contains a polyether-modified silicone with a (C)HLB value of less than 6.0. The oil phase may contain one or more components C, and may particularly contain one component C.

[0059] Component C, a nonionic surfactant, can function as an emulsifying agent in an oil-in-water emulsion composition. In this invention, since the migration of component C to the aqueous phase is suppressed, component C can function effectively as an emulsifying agent. This improves the high-temperature stability of the oil-in-water emulsion composition.

[0060] The HLB value of component C may be 3.0 or higher and less than 6.0. The HLB value of component C may be 3.0 or higher, 3.5 or higher, 4.0 or higher, or 4.5 or higher, and may be 6.0 or lower, 5.5 or lower, 5.0 or lower, or 4.5 or lower, or 4.5. This effectively improves the high-temperature stability of the oil-in-water emulsion composition.

[0061] Component C is not particularly limited as long as it is a polyether-modified silicone that satisfies the above HLB value, but may be, for example, PEG-10 dimethicone (KF-6017), PEG-3 dimethicone (KF-6015), cetyl PEG / PPG-10 / 1 dimethicone (KF-6048), PEG-9 polydimethylsiloxyethyl dimethicone (KF-6028), and lauryl PEG-9 polydimethylsiloxyethyl dimethicone (KF-6038), and may be particularly PEG-10 dimethicone.

[0062] The content of component C in the oil phase is not particularly limited and may be, for example, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, or 2.0% by mass or more, or 5.0% by mass or less, 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, or 1.5% by mass or less.

[0063] (Fatty acids or their salts) The oil phase may contain fatty acids or salts thereof. The fatty acids are not particularly limited. They may be straight-chain or branched-chain saturated or unsaturated fatty acids with 12 to 22 carbon atoms. Examples of salts include Ca, Mg, Zn, Zr, Al, and Ti. The fatty acid or salt thereof may be behenic acid in particular.

[0064] The content of fatty acids or their salts in the oil phase is not particularly limited and may be, for example, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, or 2.5% by mass or more, or 5.0% by mass or less, 4.0% by mass or less, or 3.0% by mass or less.

[0065] The ratio of the mass of fatty acids or their salts in the oil phase to the mass of component C is not particularly limited. This ratio may be, for example, 0.1 or more, 0.5 or more, 1.0 or more, 1.1 or more, 1.2 or more, 1.3 or more, 1.4 or more, or 1.5 or more, and may also be 3.0 or less, 2.5 or less, 2.3 or less, 2.0 or less, or 1.5 or less. When this ratio is within the above range, the re-aggregation of the hydrophobized pigment can be effectively suppressed.

[0066] (Oil content) The oil content in the oil phase is not particularly limited and may include, for example, silicone oil, polar oil, hydrocarbon oil, etc.

[0067] The silicone oil is not particularly limited and may be a non-volatile silicone oil, a volatile silicone oil, or a combination thereof.

[0068] The non-volatile silicone oil is not particularly limited and may include, for example, dimethicone (6cs), caprylyl methicone, or a combination thereof.

[0069] The volatile silicone oil is not particularly limited and may be, for example, dimethicone (1.5 cs).

[0070] The ratio of the mass of non-volatile silicone oil to the total mass of silicone oil is not particularly limited, but may be 0.25 or more, 0.50 or more, or 0.60 or more, and more particularly 0.70 or more, 0.80 or more, 0.90 or more, 0.95 or more, or 0.99 or more, and more particularly 1. In other words, the silicone oil may consist only of non-volatile silicone oil. When this ratio is within the above range, the high-temperature stability of the oil-in-water emulsion composition can be effectively improved.

[0071] (Other ingredients) The oil phase may further contain components other than those mentioned above. The type and amount of such components are not particularly limited.

[0072] <Ingredient D: Nonionic surfactant with an HLB value of 14.0 or higher> In the oil-in-water emulsion composition of the present invention, the aqueous phase and the oil phase are emulsified by a nonionic surfactant with a (D)HLB value of 14.0 or higher. That is, component D can function as an emulsifier in the present invention.

[0073] The HLB value of component D may be between 14.0 and 18.0. The HLB value of component D may be between 14.0 and 14.5 and 15.0 and 15.5 and 16.0 and 18.0 or less, 17.5 or less, 17.0 or less, 16.5 or less, or 16.0 or less, and may also be 16.0.

[0074] Component D is not particularly limited as long as it is a nonionic surfactant that satisfies the above HLB value, but may be PEG-60 glyceryl isostearate, PEG-90 glyceryl isostearate, beheneth-20, beheneth-30, PEG-20 stearate, PEG-40 stearate, PEG-60 hydrogenated castor oil, PEG-100 hydrogenated castor oil, and polysorbate 20, and may be particularly PEG-60 glyceryl isostearate.

[0075] Based on its HLB value, component D can be considered to be present in the oil phase in an oil-in-water emulsion composition. The content of component D in the oil phase is not particularly limited and may be, for example, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, or 1.5% by mass or more, or 5.0% by mass or less, 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, or 1.5% by mass or less.

[0076] <Other ingredients> The oil-in-water emulsion composition of the present invention may contain other optional components as long as they do not affect the effects of the present invention. Examples of other optional components include additives that can be commonly incorporated into cosmetics, such as anionic surfactants, cationic surfactants, amphoteric surfactants, humectants, thickeners, water-soluble polymers, oil-soluble polymers, film-forming agents such as silicone polysaccharides, higher fatty acids such as isostearic acid, metal ion chelating agents, lower alcohols such as ethanol, higher alcohols such as stearyl alcohol, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, other UV absorbers other than the UV absorbers mentioned above, pH adjusters, skin nutrients, vitamins, water-soluble agents applicable to pharmaceuticals, quasi-drugs, cosmetics, etc., buffers, anti-fading agents, preservatives, dispersants, propellants, organic powders, other pigments other than those that can be used as the above-mentioned luminous pigments and inorganic pigments (e.g., organic pigments), dyes, pigments, fragrances, etc.

[0077] <Relationship> The oil-in-water emulsion composition of the present invention satisfies the following relational formula (1): 1.10 ≤ Mass of component A / (Mass of component B + Mass of component C) ≤ 5.50 … (1).

[0078] In this way, by setting the relationship between the mass of component A and the total mass of components B and C within an appropriate range, the unintended movement of component C from the oil phase to the aqueous phase can be suppressed, thereby improving the high-temperature stability of the oil-in-water emulsion composition.

[0079] In the above formula (1), the mass of component A / (mass of component B + mass of component C) may be 1.20 or more, 1.30 or more, 1.40 or more, 1.50 or more, 2.00 or more, 2.50 or more, 3.00 or more, 3.50 or more, 3.60 or more, 3.70 or more, 3.80 or more, 3.90 or more, 4.00 or more, 4.10 or more, 4.20 or more, 4.30 or more, 4.40 or more, or 4.50 or more, and may also be 5.25 or less, 5.00 or less, 4.90 or less, 4.80 or less, 4.70 or less, 4.60 or less, 4.50 or less, 4.40 or less, 4.30 or less, 4.20 or less, 4.10 or less, 4.00 or less, 3.00 or less, 2.00 or less, or 1.50 or less. If the ratio of the mass of component A to the mass of component B is within the above range, the high-temperature stability of the oil-in-water emulsion composition can be effectively improved.

[0080] The oil-in-water emulsion composition of the present invention may further satisfy the following relational formula (2): 1.50 ≤ Mass of component A / Mass of component B < 40.0 … (2).

[0081] In this way, by setting the relationship between the mass of component A and the mass of component B within an appropriate range, the re-aggregation of component A can be easily suppressed.

[0082] In formula (2) above, the ratio of the mass of component A to the mass of component B may be 5.00 or more, 10.0 or more, 11.0 or more, 12.0 or more, 13.0 or more, 14.0 or more, 15.0 or more, or 16.0 or more, and may also be 35.0 or less, 30.0 or less, 25.0 or less, 20.0 or less, 17.0 or less, 16.0 or less, 15.0 or less, 14.0 or less, 13.0 or less, 12.0 or less, 11.0 or less, or 10.0 or less.

[0083] The oil-in-water emulsion composition of the present invention may further satisfy the following relational formula (3): 1.00 ≤ Mass of component C / Mass of component B ≤ 7.00 … (3).

[0084] In this way, by setting the relationship between the mass of component C and the mass of component B within an appropriate range, the migration of component C into the aqueous phase is easily suppressed, and therefore the high-temperature stability of the oil-in-water emulsion composition is easily improved.

[0085] In the above formula (3), the ratio of the mass of component C to the mass of component B may be 1.50 or more, 2.00 or more, 2.50 or more, 3.00 or more, 4.00 or more, 5.00 or more, or 6.00 or more, and may also be 6.00 or less, 5.00 or less, 4.00 or less, 3.00 or less, 2.50 or less, or 2.00 or less.

[0086] The oil-in-water emulsion composition of the present invention may further satisfy the following relational formula (4): 0.20 ≤ Mass of component D / (Mass of component B + Mass of component C) < 1.00 … (4).

[0087] In this way, by setting the relationship between the mass of component D and the total mass of components B and C within an appropriate range, the high-temperature stability of the oil-in-water emulsion composition can be easily improved.

[0088] In the above formula (4), the mass of component D / (mass of component B + mass of component C) may be 0.50 or more, 0.60 or more, 0.70 or more, or 0.80 or more, and may also be 0.90 or less, 0.80 or less, or 0.70 or less. The oil-in-water emulsion composition of the present invention may further satisfy the following relational formula (5): 1.00 ≤ (mass of component A + mass of component B) / mass of component C ≤ 10.0 … (5).

[0089] In this way, by setting the relationship between the total mass of components A and B and the mass of component C within an appropriate range, the high-temperature stability of the oil-in-water emulsion composition can be easily improved.

[0090] In the above formula (5), (mass of component A + mass of component B) / component C may be 1.50 or more, 1.80 or more, 2.00 or more, 3.00 or more, 4.00 or more, 5.00 or more, 5.50 or more, 6.00 or more, or 6.50 or more, and may also be 9.00 or less, or 8.00 or less, and in particular may be 7.50 or less, or 7.00 or less, and more particularly may be 6.80 or less, 6.70 or less, 6.60 or less, 6.50 or less, 6.00 or less, 5.50 or less, 5.00 or less, 4.00 or less, 3.00 or less, or 2.00 or less.

[0091] <Dosage Form> The dosage form of the oil-in-water emulsion composition of the present invention is not particularly limited and may be, for example, liquid, emulsion, cream, gel, spray, mousse, etc.

[0092] <Application> The oil-in-water emulsion composition of the present invention is useful as a cosmetic. The cosmetic is not particularly limited and may be, for example, a skincare cosmetic, a makeup cosmetic, a primer cosmetic, or a sunscreen cosmetic, and is particularly useful as a primer cosmetic or sunscreen cosmetic. The application site, product form, etc., when using the oil-in-water emulsion composition of the present invention as a cosmetic are not particularly limited. The oil-in-water emulsion composition of the present invention may, for example, be a cosmetic used for application to the skin.

[0093] Oil-in-water emulsion compositions can be produced by a method comprising the following steps: To prepare an aqueous phase containing component A and component B, and an oil phase containing component C. To emulsify the aqueous phase and the oil phase with component D.

[0094] The method for preparing the aqueous phase and the oil phase is not particularly limited, and examples include mixing the components of the aqueous phase and the components of the oil phase, respectively.

[0095] The method for emulsifying the aqueous and oil phases is not particularly limited; for example, adding the oil phase to the aqueous phase and emulsifying it is one example. Furthermore, the aqueous and oil phases may be heated as desired to dissolve their respective components. In this case, the heating temperature is not particularly limited and may be, for example, 50°C to 100°C. The emulsification method is not particularly limited, and using an emulsifier is one example.

[0096] Furthermore, oil-in-water emulsion compositions can also be produced by a method comprising the following steps: To prepare an aqueous phase and an oil phase containing components C and D. The process involves mixing an aqueous phase and an oil phase, emulsifying them, and preparing an oil-in-water emulsion base. To obtain an aqueous dispersion containing component A and component B, and a polyol and / or ethyl alcohol, and Mix an oil-in-water emulsion base and an aqueous dispersion.

[0097] For information on how to obtain an aqueous dispersion, please refer to the above description regarding the method for producing an aqueous dispersion.

[0098] The method for mixing the oil-in-water emulsion base and the aqueous dispersion is not particularly limited, and an example is a method of adding and mixing the aqueous dispersion to the oil-in-water emulsion base. [Examples]

[0099] <<Reference example>> <Manufacturing of oil-in-water emulsion composition> (Preparation of aqueous and oil phases) The aqueous and oil phases were prepared by mixing the components of the aqueous and oil phases listed in Table 1, respectively. The numerical values ​​for each component in Table 1 and other tables described later represent the content (mass %).

[0100] (emulsification) The oil phase was added to the aqueous phase and emulsified using an emulsifier. This prepared the oil-in-water emulsion composition of the reference example.

[0101] <<Examples 1-3 and Comparative Example 1>> <Manufacturing of oil-in-water emulsion composition> (Preparation of aqueous and oil phases) The aqueous and oil phases were prepared by mixing the components of the aqueous phase (excluding the aqueous dispersion described later) and the components of the oil phase, respectively, as shown in Table 1.

[0102] (Preparation of oil-in-water emulsion base) The oil phase was added to the aqueous phase and emulsified using an emulsifier. This prepared an oil-in-water emulsion base.

[0103] (Preparation of aqueous dispersion) Butylene glycol (BG) as a polyol, titanium dioxide treated with triethoxycaprylylsilane and aluminum hydroxide (Al) as component A (average particle size: 150-250 nm), and PEG-12 dimethicone (HLB value: 8.0) as component B were mixed in the amounts shown in Table 1. This yielded an aqueous dispersion.

[0104] (Mixing of oil-in-water emulsion base and aqueous dispersion) The aqueous dispersion was added to the oil-in-water emulsion base and mixed. This yielded the oil-in-water emulsion compositions of Examples 1-3 and Comparative Example 1. Comparative Example 1 had the same composition as Reference Example 1, except that it used an aqueous dispersion and the amount of water differed accordingly.

[0105] <Rating> (Pigment re-aggregation) After rotating each example of the oil-in-water emulsion composition at 20 rpm for 4 hours using a three-one motor, the degree of re-aggregation of the hydrophobically treated pigment was evaluated by visual observation according to the following criteria: A: No aggregation of component A was observed. B: Component A was slightly aggregated. C: Component A was slightly aggregated (for example, this does not pose a problem for use as a cosmetic product). D: Component A was clearly aggregated.

[0106] (high temperature stability) The degree of high-temperature stability of each oil-in-water emulsion composition was evaluated by visually observing the oil phase (oil droplets) one hour after preparation and by observing the oil droplets of a sample that had been left standing at 50°C for four weeks, using an optical microscope (400x magnification), according to the following criteria. A: There was almost no change in the size of the oil droplets. B: The oil droplet size had changed slightly. C: The oil droplet size had clearly changed. D: The size of the oil droplets clearly changed, and changes in oil separation and color tone were also observed in the appearance.

[0107] The results are shown in Table 1.

[0108] [Table 1]

[0109] Specifically, for components B, C, and D in Table 1 and the tables described later, the following commercially available products were used: ·Ingredient B: DOWSIL TM ES-5373 (manufactured by Dow Chemical Japan) • Ingredient C: KF-6017P (manufactured by Shin-Etsu Silicone Co., Ltd.) • Ingredient D: EMALEX GWIS-160N (manufactured by Nippon Emulsion Co., Ltd.)

[0110] As shown in Table 1, in the oil-in-water emulsion compositions of the examples, each containing components A to D in each phase and satisfying relational formula (1), both suppression of pigment re-aggregation and improvement of high-temperature stability were achieved. In particular, in Examples 2 and 3, where the value of relational formula (5) was below a predetermined value, high-temperature stability was further improved.

[0111] <<Examples 4-6 and Comparative Example 2>> Except for changing the amount of component B as shown in Table 2, oil-in-water emulsion compositions for Examples 4-6 and Comparative Example 2 were obtained and evaluated in the same manner as in Example 3. The results are shown in Table 2. For reference, the results for Example 3 are also included in Table 2.

[0112] [Table 2]

[0113] As shown in Table 2, in the oil-in-water emulsion composition, even when the amount of component B was changed, as long as the relationship (1) was satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability could be achieved.

[0114] <<Example 7 and Comparative Example 3>> Except for changing the amount of component C as shown in Table 3, the oil-in-water emulsion compositions of Example 7 and Comparative Example 3 were obtained and evaluated in the same manner as in Example 3. The results are shown in Table 3. For reference, the results of Example 3 are also included in Table 3.

[0115] [Table 3]

[0116] As shown in Table 3, in the oil-in-water emulsion composition, even when the amount of component C was changed, as long as the relationship (1) was satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability could be achieved.

[0117] <<Example 8>> Except for changing the amount of behenic acid as shown in Table 4, the oil-in-water emulsion composition of Example 8 was obtained and evaluated in the same manner as in Example 2. The results are shown in Table 4. For reference, the results of Example 2 are also included in Table 4.

[0118] [Table 4]

[0119] As shown in Table 4, in the oil-in-water emulsion composition, even when the amount of behenic acid was changed, as long as the relationship (1) was satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability could be achieved.

[0120] <<Examples 9 and 10>> Except for changing the ratio of the mass of non-volatile silicone oil to the total mass of silicone oil as shown in Table 5, the oil-in-water emulsion compositions of Examples 9 and 10 were obtained and evaluated in the same manner as in Example 3. The results are shown in Table 5. For reference, the results of Example 3 are also included in Table 5.

[0121] [Table 5]

[0122] As shown in Table 5, in the oil-in-water emulsion composition, even when the ratio of the mass of non-volatile silicone oil to the total mass of silicone oil was changed, as long as relation (1) was satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability could be achieved.

[0123] <<Comparative Example 4>> A water-in-water emulsion composition for Comparative Example 4 was obtained and evaluated in the same manner as for Comparative Example 1, except that the amounts of components A and B were changed as shown in Table 6. The results are shown in Table 6. For reference, the results for Comparative Example 1 are also included in Table 6.

[0124] [Table 6]

[0125] As shown in Table 6, in oil-in-water emulsion compositions, if the relationship formula (1) is not satisfied, it was not possible to suppress pigment re-aggregation and improve high-temperature stability simultaneously.

[0126] <<Example 11>> The oil-in-water emulsion composition of Example 11 was obtained and evaluated in the same manner as in Comparative Example 4, except that the amount of component A was changed as shown in Table 7. The results are shown in Table 7. For reference, the results of Comparative Example 4 are also included in Table 7.

[0127] [Table 7]

[0128] As shown in Table 7, in oil-in-water emulsion compositions, when relational formula (1) is satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability can be achieved.

[0129] <<Examples 12-15>> Except for changing the type of component A as shown in Table 8, oil-in-water emulsion compositions of Examples 12 to 15 were obtained and evaluated in the same manner as in Example 3. The results are shown in Table 8. For reference, the results of Example 3 are also included in Table 8.

[0130] [Table 8]

[0131] As shown in Table 8, in oil-in-water emulsion compositions, even when the type of component A is changed, as long as relation (1) is satisfied, both suppression of pigment re-aggregation and improvement of high-temperature stability can be achieved.

[0132] <<Prescription Example 1>> Examples of formulations of the present invention are given below. However, the present invention is not limited in any way by these formulation examples.

[0133] [Table 9]

Claims

1. Aqueous phase, and Oil phase It has, The aforementioned aqueous phase (A) Pigments treated with a hydrophobic treatment agent, and (B) Polyether-modified silicone with an HLB value of 6.0 or higher Includes, The oil phase is (C) Polyether-modified silicone with an HLB value of less than 6.0 Includes, (D) The aqueous phase and the oil phase are emulsified with a nonionic surfactant with an HLB value of 14.0 or higher, The following relation (1) is satisfied: Oil-in-water emulsion composition: 1.10 ≤ Mass of component A / (Mass of component B + Mass of component C) ≤ 5.50 … (1).

2. Furthermore, the oil-in-water emulsion composition according to claim 1 satisfies the following relational expression (2): 1.50 ≤ Mass of component A / Mass of component B < 40.0 ... (2).

3. Furthermore, the oil-in-water emulsion composition according to claim 1 satisfies the following relational expression (3): 1.00 ≤ Mass of component C / Mass of component B ≤ 7.00 … (3).

4. Furthermore, the oil-in-water emulsion composition according to claim 1 satisfies the following relational expression (4): 0.20 ≤ Mass of component D / (Mass of component B + Mass of component C) < 1.00 ... (4).

5. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the HLB value of component B is 6.0 or more and 15.0 or less.

6. The oil-in-water emulsion composition according to claim 5, wherein component B is PEG-12 dimethicone.

7. An oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the HLB value of component C is 3.0 or more and less than 6.

0.

8. The oil-in-water emulsion composition according to claim 7, wherein component C is PEG-10 dimethicone.

9. An oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the HLB value of component D is 14.0 or more and 18.0 or less.

10. The oil-in-water emulsion composition according to claim 9, wherein component D is PEG-60 glyceryl isostearate.

11. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the hydrophobic treatment agent is an alkylsilane, a fatty acid or a salt thereof, an ester oil, an acyl amino acid or a salt thereof, or a combination thereof.

12. The oil-in-water emulsion composition according to claim 11, wherein the hydrophobic treatment agent is triethoxycaprylylsilane, stearate, isostearyl sebacate, disodium stearoyl glutamate, sodium stearoyl glutamate, and sodium dilauramidoglutamidolin.

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