Oily cosmetic composition

Abstract

Provided is an oily cosmetic composition with which it is possible to further improve a UV absorption effect, while providing a moisturizing effect.　This oily cosmetic composition contains a polyalkylene glycol, a UV absorber, and an oil component other than the UV absorber, wherein the content of the polyalkylene glycol is 5.0 mass% or more, the oil component includes a silicone oil, the content of the silicone oil is 60 parts by mass or more with respect to a total of 100 parts by mass of the UV absorber and the oil component, and the content of water is 1.0 mass% or less.

Description

Oil-based cosmetic composition

[0001] The present invention relates to an oily 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 cosmetic comprising (A) an ultraviolet absorber containing t-butyl methoxydibenzoylmethane, (B) butyloctyl salicylate, and (C) an alkylene oxide derivative.

[0004] Furthermore, Patent Document 2 discloses an oil-based cosmetic preparation that contains (A) an ultraviolet protection agent and (B) one or more selected from (i) alkylene oxide derivatives and (ii) polyhydric alcohols that are water-soluble and have an IOB of 5.0 or less, and that has a water content of 5% by mass or less.

[0005] JP 2022-154698 A International Publication No. 2020 / 032242

[0006] 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.

[0007] The present invention is intended to improve the above-mentioned circumstances, and its object is to provide an oil-based cosmetic composition that can further improve the ultraviolet absorbing effect while maintaining a moisturizing effect.

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

[0009] <Aspect 1> An oil-based cosmetic composition comprising a polyalkylene glycol, an ultraviolet absorber, and an oil component other than the ultraviolet absorber, wherein the content of the polyalkylene glycol is 5.0% by mass or more, the oil component comprises a silicone oil, the content of the silicone oil is 60 parts by mass or more per 100 parts by mass of the ultraviolet absorber and the oil component combined, and the content of water is 1.0% by mass or less. <Aspect 2> The oil-based 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 oil-based cosmetic composition according to Aspect 1 or 2, wherein the silicone oil comprises a non-volatile silicone oil. <Aspect 4> The oil-based cosmetic composition according to any one of Aspects 1 to 3, wherein the content of the silicone oil is 50% by mass or more. <Aspect 5> The oil-based cosmetic composition according to any one of Aspects 1 to 4, wherein the polyalkylene glycol is polyethylene glycol. <Aspect 6> The oil-based cosmetic composition according to Aspect 5, wherein the polyethylene glycol comprises PEG-20. <Aspect 7> The oil-based cosmetic composition according to any one of Aspects 1 to 6, further comprising an oil gelling agent. <Aspect 8> A sunscreen cosmetic comprising the oil-based cosmetic composition according to any one of Aspects 1 to 7.

[0010] According to the present invention, it is possible to provide an oil-based cosmetic composition that can further improve the ultraviolet absorbing effect while maintaining the moisturizing effect.

[0011] 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.

[0012] <Oil-Based Cosmetic Composition> The oil-based cosmetic composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") comprises a polyalkylene glycol, an ultraviolet absorber, and an oil component other than the ultraviolet absorber, wherein the polyalkylene glycol content is 5.0% by mass or more, the oil component comprises a silicone oil, wherein the silicone oil content is 60 parts by mass or more per 100 parts by mass of the total of the ultraviolet absorber and the oil component, and the water content is 1.0% by mass or less.

[0013] The present invention uses a combination of a specific amount of polyalkylene glycol and a specific amount of a specific oil, thereby making it possible to obtain a moisturizing effect while further improving the UV absorption effect when the composition of the present invention is actually applied to the skin.

[0014] Without being limited by theory, it is considered that this is because, when the composition of the present invention is applied to skin, the polyalkylene glycol dissolved in specific oil is precipitated by the application pressure, becomes a mass, and can fill the skin grooves on skin, so that the coating film that contains ultraviolet absorber is formed uniformly on skin.In addition, it is assumed that the coating film that contains ultraviolet absorber is formed uniformly on skin, so that the ultraviolet absorption effect of ultraviolet absorber is improved.

[0015] The components of the composition of the present invention will be described in detail below.

[0016] <Polyalkylene Glycol> The composition of the present invention contains a polyalkylene glycol, which not only provides a moisturizing effect to the skin but also improves 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 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 polyalkylene glycol may be 5.0% by mass or more. More specifically, the content of polyalkylene glycol may be 5.0% by mass or more, 6.0% by mass or more, 7.0% by mass or more, 8.0% by mass or more, 9.0% by mass or more, or 10% by mass or more, and 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, based on the total mass of the composition.

[0025] Furthermore, in the composition of the present invention, the content of the polyalkylene glycol relative to 100 parts by mass of the ultraviolet absorber is not particularly limited, and may be, for example, 20 parts by mass or more, 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.

[0026] <Ultraviolet Absorber> The composition of the present invention contains an ultraviolet absorber. By including an ultraviolet absorber, the composition of the present invention can obtain an ultraviolet absorbing effect.

[0027] 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.

[0028] 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.

[0029] Salicylic acid derivatives include, but are not limited to, ethylhexyl salicylate, homosalate, dipropylene glycol salicylate, and TEA salicylate.

[0030] 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.

[0031] Dibenzoylmethane derivatives include, but are not limited to, 4-tert-butyl-4'-methoxydibenzoylmethane and the like.

[0032] β,β-diphenylacrylate derivatives include, but are not limited to, octocrylene.

[0033] 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.

[0034] Benzylidene camphor derivatives include, but are not limited to, terephthalylidene dicamphor sulfonic acid and the like.

[0035] 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.

[0036] Phenylbenzimidazole derivatives include, but are not limited to, phenylbenzimidazole sulfonic acid, and disodium phenyldibenzimidazole tetrasulfonate.

[0037] 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.

[0038] Phenylbenzotriazole derivatives include, but are not limited to, drometrizole trisiloxane, and methylene bis(benzotriazolyl tetramethylbutylphenol).

[0039] Anthranil derivatives include, but are not limited to, menthyl anthranilate and the like.

[0040] Examples of imidazoline derivatives include, but are not limited to, ethylhexyldimethoxybenzylidene dioxoimidazoline propionate.

[0041] Benzalmalonate derivatives include, but are not limited to, polyorganosiloxanes having benzalmalonate functional groups (eg, polysilicone-15).

[0042] Examples of 4,4-diarylbutadiene derivatives include, but are not limited to, 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene.

[0043] The composition of the present invention may contain only one type of ultraviolet absorber, or may contain two or more types of ultraviolet absorbers.

[0044] Furthermore, in the composition of the present invention, the content of the ultraviolet absorber 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, relative to the entire composition, and may be 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.

[0045] <Oil> The composition of the present invention contains an oil component other than the ultraviolet absorbent. In the following description, the oil component other than the ultraviolet absorbent contained in the composition of the present invention will be simply referred to as "oil component."

[0046] In the composition of the present invention, the content of the oil is not particularly limited, and may be, for example, 50% by mass or more, 52% by mass or more, 55% by mass or more, 57% by mass or more, 60% by mass or more, 62% by mass or more, 65% by mass or more, 67% by mass or more, 70% by mass or more, 75% by mass or more, 77% by mass or more, 80% by mass or more, 82% by mass or more, 85% by mass or more, or 87% by mass or more, relative to the entire composition, and may be 94% by mass or less, 92% by mass or less, 90% by mass or less, or 88% by mass or less.

[0047] In the present invention, the form of the oil at room temperature is not particularly limited, and it may be in any of a liquid, solid, or semi-solid form.

[0048] (Silicone Oil) In the composition of the present invention, the oil component includes a silicone oil. Note that, in the present invention, "silicone oil" refers to an oil component that can be used in cosmetics and has a main skeleton formed by siloxane bonds.

[0049] In the present invention, silicone oil can be volatile silicone oil or non-volatile silicone oil, but preferably silicone oil comprises non-volatile silicone oil.When silicone oil comprises non-volatile silicone oil, it is considered that it can obtain the effect of usability (for example, the effect of further reducing stickiness after application) and the effect of maintaining the airtightness when the composition of the present invention is put into a container.

[0050] In the present invention, "volatile" oil means oil having a boiling point of 260°C or less at normal pressure (1 atmosphere). Correspondingly, in the present invention, "non-volatile" oil means oil having a boiling point of more than 260°C at normal pressure (1 atmosphere).

[0051] In the present invention, specific examples of silicone oils include, but are not limited to, acyclic silicone oils such as polydimethylsiloxane (also referred to as "dimethicone"), diphenylsiloxyphenyltrimethicone (also referred to as "methylphenylpolysiloxane"), and methylhydrogenpolysiloxane; cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; and mixtures of two or more thereof.

[0052] In the composition of the present invention, the content of silicone oil can be determined by the balance with above-mentioned ultraviolet absorber.That is, in the present invention, the content of silicone oil is 60 mass parts or more relative to the total 100 mass parts of ultraviolet absorber and oil content.More specifically, relative to the total 100 mass parts of ultraviolet absorber and oil content, the content of silicone oil can be 60 mass parts or more, 62 mass parts or more, 64 mass parts or more, 66 mass parts or more, 68 mass parts or more, 70 mass parts or more, 72 mass parts or more, 74 mass parts or more, 76 mass parts or more, 78 mass parts or more, 80 mass parts or more, 82 mass parts or more, or 84 mass parts or more, and can be 99 mass parts or less, 95 mass parts or less, 92 mass parts or less, 90 mass parts or less, 88 mass parts or less, 85 mass parts or less, 82 mass parts or less, 80 mass parts or less, or 78 mass parts or less.

[0053] Furthermore, the content of silicone oil relative to the entire composition of the present invention is not particularly limited, and may be, for example, 50% by mass or more, 52% by mass or more, 55% by mass or more, 57% by mass or more, 60% by mass or more, 62% by mass or more, 65% by mass or more, 67% by mass or more, 70% by mass or more, 75% by mass or more, 77% by mass or more, 80% by mass or more, 82% by mass or more, 85% by mass or more, or 87% by mass or more, and may be 94% by mass or less, 92% by mass or less, 90% by mass or less, or 88% by mass or less.

[0054] Furthermore, in the composition of the present invention, the content of silicone oil in the oil component may be, for example, 75% by mass or more, 85% by mass or more, 90% by mass or more, 95% by mass or more, 99% by mass or more, or 100% by mass.

[0055] (Other Oils) The composition of the present invention may further contain an appropriate amount of other oils in addition to the silicone oil, as long as the effects of the present invention are not impaired. The following describes examples of other oils, but the present invention is not limited to these examples.

[0056] In the present invention, the oil component may further include, for example, a hydrocarbon oil. Note that, in the present invention, "hydrocarbon oil" refers to the hydrocarbon oil remaining after removing the above-mentioned ultraviolet absorber and the polar oil described below. Furthermore, the hydrocarbon oil may be a volatile hydrocarbon oil or a non-volatile hydrocarbon oil.

[0057] 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.

[0058] In the composition of the present invention, when the oil component contains a hydrocarbon oil, the content of the hydrocarbon oil is not particularly limited. For example, the content of the hydrocarbon oil may be 1.0 mass% or more, 5.0 mass% or more, 10 mass% or more, 15 mass% or more, or 20 mass% or more, and may be 25 mass% or less, or 22 mass% or less, relative to the oil component.

[0059] In the present invention, the oil may further include, for example, a polar oil. Polar oil refers to an oil with high polarity among oils that can be used in cosmetics after removing the above-mentioned UV absorbers and silicones, and refers to, for example, an oil 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. The IOB value is an abbreviation for Inorganic / Organic Balance (inorganic / organic ratio), and is a value that represents the ratio of the inorganic value to the organic value, and is an index that indicates 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 the type of atom or functional group, such as 20 for one carbon atom in a molecule and 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by integrating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound (see, for example, "Organic Conceptual Diagram - Fundamentals and Applications" by Yoshio Koda, pp. 11-17, Sankyo Publishing, 1984).

[0060] Polar oils include, but are not limited to, ester oils. 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. Ingredients: Triethylhexanoin (Glyceryl Tri-2-ethylhexanoate), Glyceryl Trioctanoate, Glyceryl Triisopalmitate, Trimethylolpropane Triisostearate, Cetyl 2-Ethylhexanoate, 2-Ethylhexyl Palmitate, Glyceryl Trimyristate, Tri-2-Heptylundecanoic Acid Glyceride, Castor Oil Fatty Acid Methyl Ester, Oleyl Oleate, Acetoglyceride, 2-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.

[0061] In the composition of the present invention, when the oil component contains a polar oil, the content of the hydrocarbon oil is not particularly limited. For example, the content of the polar oil may be 1.0 mass% or more, 5.0 mass% or more, 10 mass% or more, 15 mass% or more, or 20 mass% or more, and may be 25 mass% or less, or 22 mass% or less, relative to the oil component.

[0062] In the present invention, the oil component may further include, 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, and the like.

[0063] <Other Components> In addition to the components described above, the composition of the present invention may further contain other components within the range that does not impair the effects of the present invention. For example, oil gelling agents, powder components, etc. may be appropriately added.

[0064] (Oil Gelling Agent) The composition of the present invention may further contain an oil gelling agent. The oil gelling agent is a component that has the effect of thickening and / or gelling oily components such as oil and UV absorbers.

[0065] Specific examples of oil gelling agents in the present invention include, but are not limited to, dextrin fatty acid esters such as dextrin palmitate and dextrin myristate; sucrose fatty acid esters such as sucrose caprylate; solid or semi-solid hydrocarbon oils such as petrolatum, hydrogenated palm oil, and hydrogenated castor oil; organically modified clay minerals such as disteardimonium hectorite and benzyldimethylstearylammonium hectorite; higher fatty acids having 8 to 22 carbon atoms that are solid at room temperature (e.g., 25°C), such as lauric acid, myristic acid, palmitic acid, stearic acid, and 12-hydroxystearic acid, or salts thereof; and amino acid gelling agents such as dibutyl lauroyl glutamide, dibutyl ethylhexanoyl glutamide, polyamide-8, and polyamide-3.

[0066] In the composition of the present invention, when an oil gelling agent is contained, its content is not particularly limited. For example, the content of the oil gelling agent relative to the entire composition may be 0.01 mass% or more, 0.05 mass% or more, 0.1 mass% or more, 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, and may be 20 mass% or less, 15 mass% or less, or 12 mass% or less.

[0067] (Powder Component) The composition of the present invention may further comprise a powder component. By incorporating a powder component, stickiness is suppressed, and the feeling in use is improved, resulting in a smooth and pleasant feel.

[0068] Examples of powder components include, but are not limited to, usable powders (e.g., hydrophobic treated silica powder), ultraviolet scattering powders, and dye or pigment powders.

[0069] When the composition of the present invention contains a powder component, the content thereof is not particularly limited. For example, the content of the powder component relative to the entire composition may be 0.01 mass% or more, 0.05 mass% or more, 0.1 mass% or more, 0.5 mass% or more, 1.0 mass% or more, or 1.5 mass% or more, and may be 15 mass% or less, 10 mass% or less, or 5.0 mass% or less.

[0070] In addition to the above, the composition of the present invention may contain other optional ingredients commonly used in cosmetics, such as, but not limited to, preservatives, chelating agents, stabilizers, sequestering agents, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, etc., as needed.

[0071] Since the composition of the present invention is an oil-based cosmetic composition, it is preferable that it is substantially free of water. However, water may be contained within a range that does not impair the effects, appearance, usability, etc. of the present invention. Therefore, when the composition of the present invention contains water, the content thereof may be, for example, 1.0% by mass or less, 0.05% by mass or less, 0.01% by mass or less, 0.005% by mass or less, or 0.001% by mass or less.

[0072] <Method for producing the composition of the present invention> The composition of the present invention can be produced using a conventional method for producing oil-based cosmetics. Note that the term "oil-based cosmetic" or "oil-based cosmetic composition" refers to a cosmetic or cosmetic composition that is a single-phase oily system.

[0073] Furthermore, when producing the composition of the present invention, if the constituent components such as the polyalkylene glycol, the ultraviolet absorber, and the oil other than the ultraviolet absorber are solid or semi-solid, they may be warmed or heated as necessary.

[0074] <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.

[0075] 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.

[0076] 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 %.

[0077] Examples 1 to 8 and Comparative Examples 1 to 10 Based on the formulations in Tables 1 and 2, oily cosmetic compositions (solid form) of Examples 1 to 8 and Comparative Examples 1 to 10 were prepared.

[0078] 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

[0079] <Evaluation of UV absorption effect> Each of the prepared compositions was applied to a PMMA skin mimic plate, 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.).

[0080] 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.

[0081] 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.

[0082] (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%.

[0083]

[0084]

[0085] As is clear from 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 have a moisturizing effect because they contain polyalkylene glycol. 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.

[0086] 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.

[0087] 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.

[0088]

[0089] 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.

[0090] In contrast to these Examples, the compositions of Comparative Examples 11 and 12 failed to improve the ultraviolet absorbing effect compared to the control, which is believed to be due to the fact that the polyalkylene glycol content in these comparative compositions was less than 5.0 mass%.

[0091] 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 to be greater.

[0092] Example 12 and Comparative Examples 13-14 Compositions of Example 12 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. The ratios of the integrated absorbance values ​​of Example 12 and Comparative Examples 13-14 to the control, as well as the UV absorption effects of these Examples and Comparative Examples, are shown in Table 4.

[0093]

[0094] As is clear from the results in Table 4, the composition of Example 12 had an improved ultraviolet absorbing effect compared to the control. It is believed that the composition of Example 12 has a moisturizing effect because it contains polyalkylene glycol.

[0095] In contrast to Example 12, the compositions of Comparative Examples 13 and 14 were unable to improve the UV absorption effect compared to the control. The results are analyzed as follows.

[0096] That is, in the composition of Example 12, the content of silicone oil is 60 parts by mass relative to the total 100 parts by mass of ultraviolet absorber and oil.If this oil composition is such, when composition is applied to skin, the polyalkylene glycol that exists in oil is easily separated out from oil due to application pressure, and the polyalkylene glycol that comes out of oil can fill the skin groove on skin.On the other hand, the amount of silicone oil that is contained in the composition of Comparative Example 13 and 14 is less than 60 parts by mass relative to the total 100 parts by mass of ultraviolet absorber and oil, and it is thought that in this oil composition, the polyalkylene glycol that exists in oil is difficult to come out of oil, and as a result, it is presumed that polyalkylene glycol cannot fill the skin groove on skin well, and the improvement of the ultraviolet absorption effect of ultraviolet absorber cannot be obtained.

[0097] Example 13, Reference Example 1, and Comparative Examples 15-16 Compositions of Example 13, Reference Example 1, and Comparative Examples 15-16 were prepared based on the formulations in Table 5. The UV absorption effect of each composition was evaluated in the same manner as above. Control a was used as a control for Example 13 and Comparative Example 15. The compositions of Reference Example 1 and Comparative Example 16 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). Control b was used as a control for Reference Example 1 and Comparative Example 16. A PMMA plate without any irregularities corresponding to the skin grooves was also used when measuring the composition of Control b.

[0098] The evaluation results of the ultraviolet absorbing effect are shown in Table 5.

[0099]

[0100] As is clear from the results in Table 5, the composition of Example 13 had an improved ultraviolet absorbing effect compared to Control a.

[0101] However, when Reference Example 1, which has the same structure as Example 13, was applied to a PMMA plate that did not have any irregularities corresponding to the skin grooves and evaluated, it was found that the ultraviolet absorbing effect could not be improved compared to Control b. The reason for this can be analyzed as follows.

[0102] In other words, since the surface of the PMMA plate, which does not have any irregularities corresponding to the skin grooves, is originally flat, it is presumed that even if the polyalkylene glycol present in the oil precipitated from the oil due to the application pressure, the polyalkylene glycol would not have had the effect of filling in the irregularities.

[0103] From these results, it is considered that the compositions of Example 13 and Reference Example 1 can exert the effect of improving ultraviolet absorption by the polyalkylene glycol present in the oil when used as skin cosmetics.

[0104] On the other hand, it was found that Comparative Examples 15 and 16, 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.

Claims

1. An oil-based cosmetic composition comprising a polyalkylene glycol, an ultraviolet absorber, and an oil component other than the ultraviolet absorber, wherein the content of the polyalkylene glycol is 5.0% by mass or more, the oil component contains silicone oil, the content of the silicone oil is 60% by mass or more with respect to a total of 100 parts by mass of the ultraviolet absorber and the oil component, and the water content is 1.0% by mass or less.

2. The oil-based 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-based cosmetic composition according to claim 1 or 2, wherein the silicone oil contains a non-volatile silicone oil.

4. The oil-based cosmetic composition according to any one of claims 1 to 3, wherein the content of the silicone oil is 50% by mass or more.

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

6. The oil-based cosmetic composition according to claim 5, wherein the polyethylene glycol contains PEG-20.

7. The oil-based cosmetic composition according to any one of claims 1 to 6, further comprising an oil gelling agent.

8. A sunscreen cosmetic containing the oil-based cosmetic composition according to any one of claims 1 to 7.

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