Water-in-oil emulsified cosmetic composition

Abstract

Provided is a water-in-oil emulsified cosmetic composition with which it is possible to further improve a UV absorption effect while providing a moisturizing effect.　This water-in-oil emulsified cosmetic composition contains polyalkylene glycol in the aqueous phase, the content of the polyalkylene glycol in the aqueous phase being at least 10 mass%, and contains a UV absorber in the oil phase.

Description

Water-in-oil emulsion cosmetic composition

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

[0002] To date, numerous sunscreen cosmetics have been developed to protect the skin from ultraviolet rays.

[0003] For example, Patent Document 1 discloses a water-in-oil emulsion sunscreen cosmetic that contains (A) 6 to 40% by mass of an ultraviolet protection agent, (B) an organically modified clay mineral, (C) an oil phase thickener other than (B), and (D) a silicone surfactant having an HLB of less than 8, wherein the ratio of [total amount of component (B) and component (C)] / [total amount of (E) non-volatile liquid oil components other than silicone oil] is 0.04 or more and less than 0.68.

[0004] International Publication No. 2016 / 068298

[0005] Adding a moisturizing agent to a sunscreen cosmetic to impart moisturizing properties to the sunscreen cosmetic has also been considered. However, when a moisturizing agent is added to a sunscreen cosmetic, the ultraviolet absorbing effect (i.e., "ultraviolet ray protection effect") of the ultraviolet absorber may be reduced when the cosmetic is actually applied to the skin.

[0006] The present invention aims to improve the above-mentioned circumstances, and its object is to provide a water-in-oil emulsion cosmetic composition that can further improve the ultraviolet absorbing effect while maintaining a moisturizing effect.

[0007] The present invention that achieves the above object is as follows.

[0008] Aspect 1: A water-in-oil emulsion cosmetic composition comprising a polyalkylene glycol in an aqueous phase, wherein the content of the polyalkylene glycol in the aqueous phase is 10% by mass or more, and wherein the oil phase comprises an ultraviolet absorber. Aspect 2: The water-in-oil emulsion cosmetic composition according to Aspect 1, wherein the polyalkylene glycol is at least one selected from those having a number average molecular weight of 800 or more. Aspect 3: The water-in-oil emulsion cosmetic composition according to Aspect 1 or 2, further comprising a silicone oil. Aspect 4: The water-in-oil emulsion cosmetic composition according to any one of Aspects 1 to 3, wherein the content of the polyalkylene glycol in the aqueous phase is 50% by mass or less. Aspect 5: The water-in-oil emulsion cosmetic composition according to any one of Aspects 1 to 4, wherein the polyalkylene glycol is polyethylene glycol. Aspect 6: The water-in-oil emulsion cosmetic composition according to Aspect 5, wherein the polyethylene glycol comprises PEG-20. Aspect 7: The water-in-oil emulsion cosmetic composition according to any one of Aspects 1 to 6, further comprising an ultraviolet scattering agent. Aspect 8: The water-in-oil emulsion cosmetic composition according to any one of Aspects 1 to 7, which is a sunscreen cosmetic.

[0009] According to the present invention, it is possible to provide a water-in-oil emulsion cosmetic composition that can further improve the ultraviolet absorbing effect while maintaining a moisturizing effect.

[0010] 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.

[0011] <Water-in-oil emulsion cosmetic composition> The water-in-oil emulsion cosmetic composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") is a water-in-oil emulsion cosmetic composition that contains a polyalkylene glycol in an aqueous phase, the content of the polyalkylene glycol in the aqueous phase being 10 mass% or more, and contains an ultraviolet absorber in the oil phase.

[0012] By incorporating a specific amount of polyalkylene glycol into the aqueous phase, the present invention can achieve moisturizing effects and further improve the UV absorption effect when the composition of the present invention is actually applied to the skin.

[0013] Without being limited by theory, it is believed that this is because, when the composition of the present invention is applied to skin, especially during the drying process, the polyalkylene glycol contained in the composition of the present invention can form a mass, and fill the skin groove on skin, so that the coating film derived from oil phase, that is, the coating film that contains ultraviolet absorber, becomes uniform.As a result, it is assumed that the polyalkylene glycol contained in the composition of the present invention leads to the improvement of the ultraviolet absorption effect of ultraviolet absorber.

[0014] <Constitution of the Composition of the Present Invention> The composition of the present invention is a water-in-oil emulsion cosmetic composition. Therefore, the composition of the present invention contains an aqueous phase and an oil phase. The constituent components of the composition of the present invention will be described in detail below.

[0015] [Aqueous phase] In the composition of the present invention, the content of the aqueous phase is not particularly limited.For example, from the viewpoint of further improving the stability of the formulation, the aqueous phase may be 50% by mass or less, 49% by mass or less, 58% by mass or less, 47% by mass or less, 46% by mass or less, 45% by mass or less, 44% by mass or less, 43% by mass or less, 42% by mass or less, 41% by mass or less, 40% by mass or less, 39% by mass or less, 38% by mass or less, 37% by mass or less, 36% by mass or less, or 35% by mass or less, based on the total composition.In addition, the content of the aqueous phase is not particularly limited, and may be, for example, 10% by mass or more, 15% by mass or more, 20% by mass or more, 22% by mass or more, 25% by mass or more, 28% by mass or more, or 30% by mass or more.

[0016] (Polyalkylene Glycol) The composition of the present invention contains a polyalkylene glycol in the aqueous phase. The polyalkylene glycol provides a moisturizing effect to the skin and can improve the ultraviolet absorbing effect of the composition of the present invention.

[0017] Here, the polyalkylene glycol is represented by the following formula (I): HO(RO) ｎ In the formula, RO represents an oxyalkylene group having 2 to 4 carbon atoms, and n represents the number average degree of polymerization, which is 3 to 500.

[0018] The polyalkylene glycol may be selected from, for example, polyethylene glycol (also referred to as "PEG"), polypropylene glycol (also referred to as "PPG"), polybutylene glycol (also referred to as "PBG"), and the like.

[0019] In the present invention, the number average molecular weight of the polyalkylene glycol is not particularly limited, and may be, for example, 150 or more, 300 or more, 400 or more, 1000 or more, 1500 or more, 4000 or more, 6000 or more, 10000 or more, 15000 or more, or 20000 or more, and may be 50000 or less, 30000 or less, 25000 or less, or 20000 or less. Among these, it is preferable that the polyalkylene glycol is at least one type selected from those having a number average molecular weight of 800 or more. The number average molecular weight of the polyalkylene glycol is measured by gel permeation chromatography using polystyrene as a standard sample.

[0020] In the present invention, in the above formula (I), RO is preferably an oxyethylene group, that is, the polyalkylene glycol is preferably polyethylene glycol.

[0021] In addition, in the above formula (I), the specific value of n may be, for example, 3 or more, 6 or more, 8 or more, 12 or more, 20 or more, 32 or more, 40 or more, 75 or more, 150 or more, 200 or more, 240 or more, or 400 or more, and may be 500 or less, 450 or less, 400 or less, 300 or less, or 250 or less.

[0022] In the present invention, specific examples of polyalkylene glycols that are polyethylene glycols include, but are not limited to, PEG-6, PEG-8, PEG-20, PEG-32, PEG-75, PEG-150, PEG-240, and PEG-400. In this specification, the number following "PEG-" indicates the number-average degree of polymerization.

[0023] In the composition of the present invention, a mixture of two or more of these may be used as the polyethylene glycol. In one embodiment of the present invention, the polyethylene glycol preferably includes PEG-20. Furthermore, from the viewpoint of, for example, reducing stickiness and further improving usability, the polyethylene glycol preferably includes at least one selected from the group consisting of PEG-75, PEG-150, PEG-240, and PEG-400.

[0024] In the composition of the present invention, the content of the polyalkylene glycol in the aqueous phase is 10% by mass or more. More specifically, the polyalkylene glycol may be present in an amount of 10% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 14% by mass or more, 15% by mass or more, 16% by mass or more, 17% by mass or more, 18% by mass or more, 19% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more, 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, 28% by mass or more, 29% by mass or more, 30% by mass or more, 31% by mass or more, 32% by mass or more, or 33% by mass or more, relative to the entire aqueous phase, and may be present in an amount of 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less.

[0025] Furthermore, the content of polyalkylene glycol relative to the entire composition of the present invention is not particularly limited, and may be, for example, more than 2.0% by mass, 5.0% by mass or more, 8.0% by mass or more, 10% by mass or more, 12% by mass or more, 14% by mass or more, 15% by mass or more, 18% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, or may be 30% by mass or less, 28% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less.

[0026] Furthermore, in the composition of the present invention, the content of the polyalkylene glycol relative to 100 parts by mass of the ultraviolet absorber contained in the oil phase described below is not particularly limited, and may be, for example, 25 parts by mass or more, 28 parts by mass or more, 30 parts by mass or more, 32 parts by mass or more, 35 parts by mass or more, 37 parts by mass or more, 40 parts by mass or more, 42 parts by mass or more, 45 parts by mass or more, 47 parts by mass or more, 50 parts by mass or more, 52 parts by mass or more, 55 parts by mass or more, 57 parts by mass or more, 60 parts by mass or more, 62 parts by mass or more, 65 parts by mass or more, 67 parts by mass or more, or 70 parts by mass or more, and may be 300 parts by mass or less, 250 parts by mass or less, 200 parts by mass or less, 150 parts by mass or less, 100 parts by mass or less, or 50 parts by mass or less.

[0027] [Other aqueous phase components] In addition to the polyalkylene glycol described above, the composition of the present invention may further contain other aqueous phase components as long as the effects of the present invention are not impaired. Hereinafter, other aqueous phase components will be described by way of example, but the present invention is not limited to these examples.

[0028] (Water) The composition of the present invention may further comprise water as an aqueous phase component.

[0029] The water is not particularly limited and may be, for example, water used in cosmetics and quasi-drugs, such as ion-exchanged water, distilled water, ultrapure water, and tap water.

[0030] When the composition of the present invention contains water, the content thereof is not particularly limited and may be, for example, 5.0% by mass or more, 10% by mass or more, 12% by mass or more, or 15% by mass or more, and may be 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, or 15% by mass or less, relative to the entire composition.

[0031] (Lower Alcohol) The composition of the present invention may further contain a lower alcohol as an aqueous phase component.

[0032] In the present invention, the term "lower alcohol" refers to an alcohol having 5 or less carbon atoms, and examples thereof include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, and t-butanol.

[0033] When the composition of the present invention contains a lower alcohol, its content 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, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, or 5.0% by mass or more, and may be 10% by mass or less, 9.5% by mass or less, 9.0% by mass or less, 8.5% by mass or less, 8.0% by mass or less, 7.5% by mass or less, 7.0% by mass or less, 6.5% by mass or less, 6.0% by mass or less, 5.5% by mass or less, or 5.0% by mass or less, relative to the entire composition.

[0034] [Oil Phase] In the composition of the present invention, the content of the oil phase is not particularly limited and may be, for example, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, or 70% by mass or more, and may be 90% by mass or less, 85% by mass or less, 80% by mass or less, or 75% by mass or less, relative to the total mass of the composition.

[0035] (Ultraviolet Absorber) The composition of the present invention contains an ultraviolet absorber in the oil phase. By including an ultraviolet absorber in the composition of the present invention, the composition can obtain an ultraviolet absorbing effect.

[0036] In the composition of the present invention, the ultraviolet absorber is not particularly limited, and examples thereof include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, and 4,4-diarylbutadiene derivatives. Specific examples of these ultraviolet absorbers will be described below, but the present invention is not limited to these examples.

[0037] Examples of benzoic acid derivatives include, but are not limited to, ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25-PABA, and diethylaminohydroxybenzoylhexyl benzoate.

[0038] Salicylic acid derivatives include, but are not limited to, ethylhexyl salicylate, homosalate, dipropylene glycol salicylate, and TEA salicylate.

[0039] Cinnamic acid derivatives include, but are not limited to, octyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate.

[0040] Dibenzoylmethane derivatives include, but are not limited to, 4-tert-butyl-4'-methoxydibenzoylmethane and the like.

[0041] β,β-diphenylacrylate derivatives include, but are not limited to, octocrylene.

[0042] Benzophenone derivatives include, but are not limited to, benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, and benzophenone-12.

[0043] Benzylidene camphor derivatives include, but are not limited to, terephthalylidene dicamphor sulfonic acid and the like.

[0044] Benzylidene camphor derivatives include, but are not limited to, 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, benzalkonium camphor methosulfate, terephthalidene discamphorsulfonic acid, and polyacrylamidomethylbenzylidene camphor.

[0045] Phenylbenzimidazole derivatives include, but are not limited to, phenylbenzimidazole sulfonic acid, and disodium phenyldibenzimidazole tetrasulfonate.

[0046] Examples of triazine derivatives include, but are not limited to, bisethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylhexylbutamido triazone, and 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine.

[0047] Phenylbenzotriazole derivatives include, but are not limited to, drometrizole trisiloxane, and methylene bis(benzotriazolyl tetramethylbutylphenol).

[0048] Anthranil derivatives include, but are not limited to, menthyl anthranilate and the like.

[0049] Examples of imidazoline derivatives include, but are not limited to, ethylhexyldimethoxybenzylidene dioxoimidazoline propionate.

[0050] Benzalmalonate derivatives include, but are not limited to, polyorganosiloxanes having benzalmalonate functional groups (eg, polysilicone-15).

[0051] Examples of 4,4-diarylbutadiene derivatives include, but are not limited to, 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene.

[0052] The composition of the present invention may contain only one type of ultraviolet absorber, or may contain two or more types of ultraviolet absorbers.

[0053] In the composition of the present invention, the content of the ultraviolet absorber contained in the oil phase is not particularly limited.Specifically, for example, the content of the ultraviolet absorber relative to the entire oil phase may be 2.0 mass% or more, 5.0 mass% or more, 7.0 mass% or more, 10 mass% or more, 11 mass% or more, 12 mass% or more, 13 mass% or more, 14 mass% or more, 15 mass% or more, 16 mass% or more, 17 mass% or more, 18 mass% or more, 19 mass% or more, or 20 mass% or more, and may be 50 mass% or less, 45 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 25 mass% or less, 20 mass% or less, or 15 mass% or less.

[0054] Furthermore, the content of the ultraviolet absorber relative to the entire composition of the present invention is not particularly limited, and may be, for example, 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more, 4.0 mass% or more, 5.0 mass% or more, 6.0 mass% or more, 7.0 mass% or more, 8.0 mass% or more, 9.0 mass% or more, 10 mass% or more, 11 mass% or more, 12 mass% or more, or 13 mass% or more, and may be 30 mass% or less, 25 mass% or less, 20 mass% or less, or 15 mass% or less.

[0055] [Other Oil Phase Components] In addition to the above-described UV absorber, the composition of the present invention may further contain other oil phase components as long as the effects of the present invention are not impaired. Hereinafter, other oil phase components will be described by way of example, but the present invention is not limited to these examples.

[0056] (Silicone oil) The composition of the present invention may further contain silicone oil as an oil phase component. The inclusion of silicone oil is preferred from the viewpoint of further improving usability. By including silicone oil, for example, stickiness in use can be improved.

[0057] In the present invention, "silicone oil" refers to oils that can be used in cosmetics and have a main skeleton formed by siloxane bonds.

[0058] In the present invention, the silicone oil may be a volatile silicone oil or a non-volatile silicone oil.

[0059] In the present invention, "volatile" oil means oil having a boiling point of 260° C. or less at normal pressure (1 atm). Correspondingly, in the present invention, "non-volatile" oil means oil having a boiling point of more than 260° C. at normal pressure (1 atm).

[0060] In the present invention, the silicone oil may be an acyclic silicone oil (for example, a linear silicone oil or a branched silicone oil) or a cyclic silicone oil. The silicone oil is preferably, for example, an acyclic silicone oil.

[0061] In the present invention, specific examples of silicone oils include, but are not limited to, acyclic silicone oils such as polydimethylsiloxane (also known as "dimethicone"), methylphenylpolysiloxane, and methylhydrogenpolysiloxane; cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; and mixtures of two or more thereof.

[0062] In the composition of the present invention, when silicone oil is contained, its content is not particularly limited.For example, based on the whole oil phase, silicone oil can be 5.0 mass% or more, 10 mass% or more, 20 mass% or more, 30 mass% or more, 40 mass% or more, 50 mass% or more, 60 mass% or more, 70 mass% or more, 80 mass% or more, or 90 mass% or more, and can be 95 mass% or less, 90 mass% or less, 85 mass% or less, 80 mass% or less, 75 mass% or less, 70 mass% or less, 65 mass% or less, or 60 mass% or less.

[0063] Furthermore, the content of silicone oil relative to the entire composition of the present invention 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, or 55% by mass or more, or may be 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less.

[0064] (Hydrocarbon Oil) The composition of the present invention may further contain a hydrocarbon oil as an oil phase component. In the present invention, the term "hydrocarbon oil" refers to the hydrocarbon oil remaining after removing the above-mentioned ultraviolet absorber and the polar oil described below.

[0065] In the present invention, the hydrocarbon oil may be a volatile hydrocarbon oil or a non-volatile hydrocarbon oil.

[0066] In the present invention, specific examples of hydrocarbon oils include, but are not limited to, decane, dodecane, isododecane, isohexadecane, liquid paraffin, hydrogenated polydecene, hydrogenated didecene, squalane, squalene, paraffin, and mixtures of two or more thereof.

[0067] When the composition of the present invention contains a hydrocarbon oil, its content is not particularly limited and may be, for example, 0.5 mass% or more, 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more, 4.0 mass% or more, or 5.0 mass% or more, relative to the entire composition, and may be 20 mass% or less, 15 mass% or less, 10 mass% or less, 9.0 mass% or less, 8.0 mass% or less, 7.0 mass% or less, 6.0 mass% or less, or 5.0 mass% or less.

[0068] (Polar Oil) The composition of the present invention may further comprise a polar oil as an oil phase component. In the present invention, "polar oil" refers to an oil component with high polarity among oil components usable in cosmetics after removing the above-mentioned ultraviolet absorber and silicone, and refers to, for example, an oil component with an IOB value of 0.10 or more, 0.11 or more, 0.12 or more, or 0.13 or more. The IOB value of the polar oil may be 0.50 or less, 0.45 or less, or 0.40 or less.

[0069] The IOB value is an abbreviation for Inorganic / Organic Balance (IOB / Organic Balance), which represents the ratio of inorganic value to organic value and is an index of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. The "inorganic value" and "organic value" are set according to various atoms or functional groups, such as an "organic value" of 20 for one carbon atom in a molecule and an "inorganic value" of 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by integrating the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Conceptual Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984).

[0070] Polar oils include, but are not limited to, ester oils.

[0071] Specific examples of ester oils include tripropylene glycol dineopentanoate, isononyl isononanoate, 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, cetyl ethylhexanoate, 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, and pentaerythritol tetra-2-ethylhexanoate. Cetyl, Triethylhexanoin (Glycerin Tri-2-ethylhexanoate), Glycerin Trioctanoate, Glycerin Triisopalmitate, Trimethylolpropane Triisostearate, Cetyl 2-Ethylhexanoate, 2-Ethylhexyl Palmitate, Glycerin Trimyristate, Tri-2-Heptylundecanoic Acid Glyceride, Castor Oil Fatty Acid Methyl Ester, Oleyl Oleate, Acetoglyceride, 2-Heptylundecyl Palmitate, Azide Examples of the alkyl acrylate include, but are not limited to, diisobutyl benzoate, N-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, alkyl (C12-15) benzoate, 2-ethylhexyl succinate, and triethyl citrate.

[0072] When the composition of the present invention contains a polar oil, its content is not particularly limited and may be, for example, 0.5 mass% or more, 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more, 4.0 mass% or more, 5.0 mass% or more, 6.0 mass% or more, 7.0 mass% or more, 8.0 mass% or more, 9.0 mass% or more, or 10 mass% or more, relative to the entire composition, and may be 20 mass% or less, 15 mass% or less, or 10 mass% or less.

[0073] (Oils Thereof) In addition to the oils described above, the composition of the present invention may further contain, for example, caproic acid, caprylic acid, capric acid, 2-ethylhexanoic acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, eicosanoic acid, behenic acid, tetracosanoic acid, myristoleic acid, palmitoleic acid, oleic acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid, hydroxystearic acid, coconut oil fatty acid, palm kernel oil fatty acid, hydrogenated palm kernel oil fatty acid, palm oil fatty acid, beef tallow fatty acid, hydrogenated beef tallow fatty acid, lard fatty acid, castor oil fatty acid, hydrogenated castor oil fatty acid, olive oil, sunflower oil, palm oil, palm kernel oil, safflower oil, castor oil, hydrogenated castor oil, coconut oil, camellia oil, cocoa butter, shea butter, etc.

[0074] [Other Additive Components] The composition of the present invention may further contain other additive components in addition to the aqueous phase component and / or oil phase component described above, as long as the effects of the present invention are not impaired. The other additive components will be described below by way of example, but the present invention is not limited to these examples.

[0075] (UV Scattering Agent) The composition of the present invention may further contain an UV scattering agent. The UV scattering agent may be dispersed in the oil phase. Furthermore, by including an UV scattering agent, the UV protection effect of the composition of the present invention can be further improved.

[0076] In the present invention, the ultraviolet scattering agent is not particularly limited, and may be, for example, particles of at least one metal oxide selected from the group consisting of titanium oxide, zinc oxide, iron oxide, and cerium oxide.

[0077] The ultraviolet scattering agent may also be one whose surface has been hydrophobized. Here, the hydrophobization treatment may be carried out using a known surface treatment agent for hydrophobization, and examples thereof include fluorine compound treatment, silicone treatment, silicone resin treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, metal soap treatment, amino acid treatment, inorganic compound treatment, plasma treatment, mechanochemical treatment, silane compound treatment, and silazane compound treatment. Among these treatments, from the viewpoint of dispersion stability and the like, treatment with silicone or silicone resin, treatment with silane compound or silazane compound, and metal soap treatment such as aluminum isostearate are preferred.

[0078] In the present invention, when the ultraviolet scattering agent is a particle, the particle diameter (i.e., average particle diameter) is not particularly limited and may be, for example, 5 nm or more, 10 nm or more, or 15 nm or more, or 200 nm or less, 100 nm or less, or 50 nm or less. The "average primary particle diameter" may be determined as the diameter of a circle equivalent to the projected area of ​​primary particles in an SEM image. The shape of the ultraviolet scattering agent particles is not particularly limited and may be, for example, spherical, plate-like, rod-like, spindle-like, needle-like, or irregular.

[0079] When the composition of the present invention contains an ultraviolet scattering agent, the content thereof is not particularly limited and may be, for example, 1.0 mass% or more, 5.0 mass% or more, 10 mass% or more, 15 mass% or more, or 18 mass% or more, and may be 30 mass% or less, 25 mass% or less, or 20 mass% or less, relative to the entire composition.

[0080] (Surfactant) The composition of the present invention may further contain a surfactant. By containing a surfactant, the surfactant can play a role in emulsifying aqueous phase components and / or dispersing powders or particles in the oil phase, depending on the type of surfactant.

[0081] In the present invention, the surfactant is not particularly limited, and for example, a surfactant having an HLB value of 1.0 to 9.0 may be used. The specific value of the HLB value of the surfactant is also not particularly limited, and may be, for example, 1.0 or more, 2.0 or more, 3.0 or more, 4.0 or more, or 5.0 or more, or 9.0 or less, 8.0 or less, 7.0 or less, 6.0 or less, or 5.0 or less. The HLB (Hydrophilic-Lipophilic Balance) value can be defined by the Griffin method.

[0082] The surfactant having an HLB value of 1.0 or more and 9.0 or less is not particularly limited, and for example, at least one selected from the group consisting of polyether-modified silicone, sorbitan fatty acid ester, polyethylene glycol fatty acid ester, glycerin fatty acid ester, and polyoxyethylene hydrogenated castor oil may be used.

[0083] Examples of polyether-modified silicones include, but are not limited to, PEG-9 polydimethylsiloxyethyl dimethicone (HLB value: 4.0), lauryl PEG-9 polydimethylsiloxydimethicone (HLB value: 3.0), and PEG-10 dimethicone (HLB value: 4.5).

[0084] Examples of sorbitan fatty acid esters include, but are not limited to, PEG-4 sorbitan triisostearate (HLB value: 3.0).

[0085] Examples of polyethylene glycol fatty acid esters include, but are not limited to, PEG-8 diisostearate (HLB value: 6.0), PEG-12 diisostearate (HLB value: 7.0), and PEG-8 dioleate (HLB value: 5.0).

[0086] Examples of glycerin fatty acid esters include, but are not limited to, polyglyceryl-2 diisostearate (HLB value: 4.0) and glyceryl stearate (HLB value: 4.0 to 6.0).

[0087] Examples of polyoxyethylene hydrogenated castor oils include, but are not limited to, PEG-20 hydrogenated castor oil triisostearate (HLB value: 6.0) and PEG-10 hydrogenated castor oil (HLB value: 7.0).

[0088] When a surfactant is contained in the composition of the present invention, the content thereof is not particularly limited, and may be, for example, 0.1 mass% or more, 0.2 mass% or more, 0.3 mass% or more, 0.4 mass% or more, 0.5 mass% or more, 0.6 mass% or more, 0.7 mass% or more, 0.8 mass% or more, 0.9 mass% or more, 1.0 mass% or more, 1.1 mass% or more, 1.2 mass% or more, 1.3 mass% or more, 1.4 mass% or more, 1.5 mass% or more, 1.6 mass% or more, 1.7 mass% or more, 1.8 mass% or more, 1.9 mass% or more, or 2.0 mass% or more, or may be 10 mass% or less, 9.0 mass% or less, 8.0 mass% or less, 7.0 mass% or less, 6.0 mass% or less, 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% or less, or 2.0 mass% or less, relative to the entire composition.

[0089] (Oil Phase Thickener) The composition of the present invention may further contain an oil phase thickener. By including an oil phase thickener, for example, the oil component can be thickened and / or gelled. The oil phase thickener may also function as an emulsifier aid.

[0090] The oil phase thickener is not particularly limited, and one or more selected from the group consisting of disteardimonium hectorite, dimethyl distearyl ammonium hectorite, benzyl dimethyl stearyl ammonium hectorite, distearyl dimethyl ammonium chloride-treated magnesium aluminum silicate, dextrin palmitate, dextrin oleate, dextrin stearate, dextrin myristate, dextrin (palmitate / ethylhexanoate), dextrin (palmitate / hexyldecanoate), inulin stearate, dibutyl lauroyl glutamide, sucrose tetrastearate triacetate, and dibutyl ethylhexanoyl glutamide may be used.

[0091] When an oil phase thickener is contained in the composition of the present invention, its content is not particularly limited and may be, for example, 0.05 mass% or more, 0.1 mass% or more, 0.2 mass% or more, 0.3 mass% or more, 0.4 mass% or more, 0.5 mass% or more, 0.6 mass% or more, 0.7 mass% or more, 0.8 mass% or more, 0.9 mass% or more, or 1.0 mass% or more, relative to the entire composition, and may be 6.0 mass% or less, 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% or less, 2.0 mass% or less, or 1.0 mass% or less.

[0092] (Optionally Added Components) In addition to the above, the composition of the present invention may contain other optional components commonly used in cosmetics, such as, but not limited to, powder components (e.g., usable powders, such as corn starch and dimethicone-treated silica), medicinal components (e.g., whitening agents, skin-beautifying agents), preservatives, chelating agents, stabilizers, sequestering agents, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, etc., as needed.

[0093] <Method for producing the composition of the present invention> The composition of the present invention can be produced using a conventional method for producing water-in-oil emulsion cosmetics, and the emulsification method is not particularly limited. For example, there is a method in which the aqueous phase and the oil phase are heated as necessary, the aqueous phase is gradually added to the oil phase, and emulsified in an emulsifier, and if heated, the method is allowed to cool to room temperature.

[0094] <Uses> The composition of the present invention can be suitably used as a cosmetic or a raw material thereof. Furthermore, since the composition of the present invention can further improve the UV absorption effect while obtaining a moisturizing effect, it can be suitably used particularly as a sunscreen cosmetic, makeup base, concealer, or foundation, or a raw material thereof. In one embodiment of the present invention, the composition of the present invention may be a sunscreen cosmetic.

[0095] Furthermore, the formulation of the cosmetic according to the present invention is not particularly limited, and may be, for example, a liquid, gel, emulsion, cream, solid, or balm.

[0096] Furthermore, the cosmetic composition according to the present invention may be a two-layer type that is shaken and / or mixed when used, or may be a type that is used as is.

[0097] 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 in the tables are expressed in mass %.

[0098] Examples 1 to 8 and Comparative Examples 1 to 10 Based on the formulations in Tables 1 and 2, water-in-oil emulsion cosmetic compositions of Examples 1 to 8 and Comparative Examples 1 to 10 were prepared.

[0099] The number average molecular weights of the polyalkylene glycols used in Table 1 are as follows: PEG-6: 300 PEG-8: 400 Mixture of PEG-6 (50%) and PEG-32 (50%): 1500 PEG-20: 1000 PEG-75: 4000 PEG-150: 6000 PEG-400: 20000 PEG-240: 11000

[0100] <Evaluation of UV absorption effect> Each of the prepared compositions was applied to a PMMA plate of artificial skin, i.e., a PMMA plate having irregularities corresponding to skin grooves (SPF MASTER (registered trademark) PA01, manufactured by Shiseido Co., Ltd.) at a concentration of 2 mg / cm. ２ The coating amount was uniformly applied to each sample composition, and the coating was left to dry for 15 minutes. The integrated absorbance value from 280 to 400 nm was then measured for each sample composition using a spectrophotometer (U-3500 self-recording spectrophotometer, manufactured by Hitachi, Ltd.).

[0101] Using a composition containing no moisturizing agent as a control, the ratio of the integrated absorbance value of each Example and Comparative Example to the control (e.g., "integrated absorbance value of Example 1 / integrated absorbance value of control") was calculated and is shown in Tables 1 and 2.

[0102] Then, using the ratio of the integrated absorbance value of the control obtained above, the ultraviolet absorbing effect of each Example and Comparative Example was evaluated based on the following criteria. The results are shown in Tables 1 and 2.

[0103] (Evaluation criteria) The ratio of the integrated absorbance value of the control was rated as follows: "A" if it was 105% or more, "B" if it was 100% or more and less than 105%, and "C" if it was less than 100%.

[0104] <Evaluation of Feeling in Use (Non-stickiness)> Furthermore, the feeling in use (non-stickiness) of each composition was evaluated as an additional effect. More specifically, a panel of experts applied each composition to their face and evaluated the feeling of stickiness after application based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0105] (Evaluation Criteria) "A" No stickiness or barely any stickiness felt; "B" Slight stickiness felt; "C" Extremely stickiness felt.

[0106]

[0107] As is clear from the results in Tables 1 and 2, it was found that the compositions of Examples 1 to 8 (Table 1) all had improved UV absorption effects compared to the control. Furthermore, among these, the composition of Example 4, which used PEG-20 as the polyalkylene glycol, was found to have the most excellent UV absorption effect. It is believed that the compositions of these Examples all contain polyalkylene glycol, and therefore have a moisturizing effect. In particular, polyalkylene glycols with a number-average molecular weight of 4,000 or less are known to have a water-retaining function, thereby providing a moisturizing effect. Furthermore, polyalkylene glycols with a number-average molecular weight of more than 4,000 are generally known to have a thickening function, thereby providing a moisturizing effect.

[0108] Furthermore, it was found that the compositions of Examples 4 to 8 had the best feel in use (non-stickiness).

[0109] In comparison with the compositions of the Examples, none of the compositions of Comparative Examples 1 to 10 (Table 2) were able to improve the UV absorption effect compared to the control. This is thought to be due to the fact that although various moisturizing agents other than polyalkylene glycol were blended in these comparative compositions, no polyalkylene glycol was blended in.

[0110] Examples 9 to 11 and Comparative Examples 11 to 12 Compositions of Examples 9 to 11 and Comparative Examples 11 to 12 were prepared based on the formulations in Table 3. The UV absorption effect of each composition was evaluated in the same manner as above. The ratios of the integrated absorbance values ​​of Examples 9 to 11 and Comparative Examples 11 to 12 to the control, as well as the UV absorption effects of these Examples and Comparative Examples, are shown in Table 3.

[0111]

[0112] As is clear from the results in Table 3, the compositions of Examples 9 to 11 all had improved UV absorption effects compared to the control. Note that, since the compositions of these Examples all contained polyalkylene glycol, it is believed that they also had moisturizing effects.

[0113] In contrast to these Examples, the compositions of Comparative Examples 11 and 12 failed to improve the UV absorption effect compared to the control, which is believed to be due to the fact that the content of polyalkylene glycol in the aqueous phase in these Comparative Examples was less than 10% by mass.

[0114] In other words, it is thought that the effect of improving ultraviolet absorption by polyalkylene glycol was not obtained because the amount of polyalkylene glycol contained in the compositions of Comparative Examples 11 and 12 was insufficient. Note that the amount of polyalkylene glycol contained in the composition of Comparative Example 12 was greater than that of Comparative Example 11, and the ratio of the absorbance integral value to the control was also greater, suggesting a tendency for the effect of improving ultraviolet absorption to be obtained by adjusting the content of polyalkylene glycol in the aqueous phase to be increased.

[0115] Example 12, Reference Example 1, and Comparative Examples 13-14 Compositions of Example 12, Reference Example 1, and Comparative Examples 13-14 were prepared based on the formulations in Table 4. The UV absorption effect of each composition was evaluated in the same manner as above. In this case, Control a was used as a control for Example 12 and Comparative Example 13. Note that the compositions of Reference Example 1 and Comparative Example 14 were applied to a PMMA plate without any irregularities corresponding to the skin grooves, instead of the PMMA plate described above (a PMMA plate with irregularities corresponding to the skin grooves). Furthermore, Control b was used as a control for Reference Example 1 and Comparative Example 14. A PMMA plate without any irregularities corresponding to the skin grooves was also used when measuring the composition of Control b.

[0116] The evaluation results of the ultraviolet absorbing effect are shown in Table 4.

[0117]

[0118] As is clear from the results in Table 4, the composition of Example 12 had an improved ultraviolet absorbing effect compared to Control a.

[0119] However, when Reference Example 1, which has the same structure as Example 12, was applied to a PMMA plate that did not have any irregularities corresponding to the skin grooves and evaluated, it was found that it was unable to improve the UV absorption effect compared to Control B. The reason for this is analyzed as follows: That is, it is presumed that because the surface of the PMMA plate that did not have any irregularities corresponding to the skin grooves was originally flat, the polyalkylene glycol contained in the composition formed clumps during the drying process, which in turn caused the coating film to become uneven.

[0120] From these results, it is considered that the compositions of Example 12 and Reference Example 1 can exhibit the effect of improving ultraviolet absorption due to the polyalkylene glycol contained in the composition when used as a skin cosmetic.

[0121] On the other hand, it was found that Comparative Examples 13 and 14, which did not contain polyalkylene glycol, were unable to improve the UV absorption effect compared to the respective controls, regardless of whether or not the PMMA plate had irregularities corresponding to skin grooves during measurement.

[0122] <Formulation Examples> Formulation examples of the composition of the present invention are given below, but the present invention is not limited to the following formulation examples.

[0123] <Prescription Example 1>

[0124] <Prescription Example 2>

[0125] <Prescription Example 3>

[0126] <Prescription Example 4>

Claims

1. An oil-in-water type emulsified cosmetic composition containing a polyalkylene glycol in an aqueous phase, wherein the content of the polyalkylene glycol in the aqueous phase is 10% by mass or more, and containing an ultraviolet absorber in an oil phase.

2. The oil-in-water type emulsified cosmetic composition according to claim 1, wherein the polyalkylene glycol is at least one selected from those having a number average molecular weight of 800 or more.

3. The oil-in-water type emulsified cosmetic composition according to claim 1 or 2, further containing a silicone oil.

4. The oil-in-water type emulsified cosmetic composition according to any one of claims 1 to 3, wherein the content of the aqueous phase is 50% by mass or less.

5. The oil-in-water type emulsified cosmetic composition according to any one of claims 1 to 4, wherein the polyalkylene glycol is polyethylene glycol.

6. The oil-in-water type emulsified cosmetic composition according to claim 5, wherein the polyethylene glycol contains PEG-20.

7. The oil-in-water type emulsified cosmetic composition according to any one of claims 1 to 6, further containing an ultraviolet scattering agent.

8. The oil-in-water type emulsified cosmetic composition according to any one of claims 1 to 7, which is a sunscreen cosmetic.

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