Water-in-oil emulsion cosmetic composition

Abstract

This invention provides an oil-in-water emulsified cosmetic composition that can simultaneously achieve moisturizing effects and further enhance ultraviolet absorption. The oil-in-water emulsified cosmetic composition contains a polyalkylene glycol in its aqueous phase at a content of 10% by mass or more, and an ultraviolet absorber in its oil phase.

Description

Technical Field

[0001] This invention relates to water-in-oil emulsion cosmetic compositions. Background Technology

[0002] To date, a large number of sunscreen cosmetics have been developed to protect the skin from ultraviolet rays.

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

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2016 / 068298 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] The addition of moisturizers to sunscreen cosmetics was also studied to impart moisturizing properties. However, if moisturizers are mixed into sunscreen cosmetics, the UV absorption effect (i.e., "UV protection effect") provided by UV absorbers may sometimes decrease when the cosmetics are actually applied to the skin.

[0009] The present invention aims to improve the above situation and its object is to provide an oil-in-water emulsion cosmetic composition that can simultaneously achieve moisturizing effects and further enhance ultraviolet absorption.

[0010] Methods for solving problems

[0011] The present invention, which achieves the above objectives, is described below.

[0012] <Option 1>

[0013] A water-in-oil emulsion cosmetic composition comprising a polyalkylene glycol in the aqueous phase. The content of the aforementioned polyalkylene glycol in the aforementioned aqueous phase is 10% by mass or more, and The oil phase contains ultraviolet absorbers.

[0014] Option 2

[0015] According to the water-in-oil emulsified cosmetic composition of Scheme 1, the polyalkylene glycol is at least one selected from polyalkylene glycols with a number average molecular weight of 800 or more.

[0016] Option 3

[0017] The water-in-oil emulsion cosmetic composition according to Scheme 1 or 2 further comprises silicone oil.

[0018] Option 4

[0019] According to any one of Schemes 1 to 3, the content of the aqueous phase is 50% by mass or less.

[0020] Option 5

[0021] According to any one of Schemes 1 to 4, the water-in-oil emulsified cosmetic composition wherein the polyalkylene glycol is polyethylene glycol.

[0022] <Option 6>

[0023] According to the water-in-oil emulsion cosmetic composition of Scheme 5, the polyethylene glycol contains PEG-20.

[0024] <Option 7>

[0025] The oil-in-water emulsified cosmetic composition according to any one of Schemes 1 to 6 further comprises an ultraviolet scattering agent.

[0026] <Option 8>

[0027] The oil-in-water emulsified cosmetic composition according to any one of Schemes 1 to 7 is a sunscreen cosmetic.

[0028] The effects of the invention

[0029] According to the present invention, an oil-in-water emulsion cosmetic composition can be provided that can simultaneously achieve moisturizing effects and further enhance ultraviolet absorption. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail. However, the present invention is not limited to the following embodiments and can be implemented in various ways within the scope of the invention's intent.

[0031] Oil-in-water emulsion cosmetic compositions

[0032] The water-in-oil emulsified cosmetic composition of the present invention (hereinafter also referred to as "the composition of the present invention") is a water-in-oil emulsified cosmetic composition that contains polyalkylene glycol in the aqueous phase. The content of polyalkylene glycol in the aqueous phase is more than 10% by mass, and The oil phase contains ultraviolet absorbers.

[0033] This invention, by mixing a specific amount of polyalkylene glycol in an aqueous phase, allows for both moisturizing effects and enhanced UV absorption when the composition is actually applied to the skin.

[0034] While not theoretically limited, it can be assumed that this is because, when the compositions of the present invention are applied to the skin, particularly during the drying process, the polyalkylene glycols contained in the compositions of the present invention can solidify and fill the skin grooves, thereby making the coating film derived from the oil phase, i.e., the coating film containing the ultraviolet absorber, more uniform. It is presumed that, as a result, the polyalkylene glycols contained in the compositions of the present invention lead to an increase in the ultraviolet absorption effect caused by the ultraviolet absorber.

[0035] <Composition of the Composition of the Invention>

[0036] The composition of the present invention is a water-in-oil emulsion cosmetic composition. Therefore, the composition of the present invention comprises an aqueous phase and an oil phase. The constituent components of the composition of the present invention are described in detail below.

[0037] [Aqueous phase]

[0038] In the compositions 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. Furthermore, 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.

[0039] (Polyalkylene glycol)

[0040] The compositions of the present invention contain polyalkylene glycols in the aqueous phase. Polyalkylene glycols can provide moisturizing effects to the skin and enhance the UV absorption effect of the compositions of the present invention.

[0041] Here, polyalkylene glycols can be derived from the following formula (I): HO(RO) n H represents RO. In the formula, RO represents an alkylene group with 2 to 4 carbon atoms, and n represents the number-average degree of polymerization, which is 3 to 500.

[0042] Polyalkylene glycols can be selected from, for example, polyethylene glycol (also referred to as "PEG"), polypropylene glycol (also referred to as "PPG"), and polybutylene glycol (also referred to as "PBG").

[0043] In this invention, the number average molecular weight of the polyalkylene glycol is not particularly limited. For example, it can be 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. Alternatively, it can be 50000 or less, 30000 or less, 25000 or less, or 20000 or less. Preferably, the polyalkylene glycol is selected from at least one polyalkylene glycol with a number average molecular weight of 800 or more. It should be noted that the number average molecular weight of the polyalkylene glycol is determined by gel permeation chromatography using polystyrene as a standard sample.

[0044] In this invention, in formula (I) above, RO is preferably oxyethylidene. That is, polyalkylene glycol is preferably polyethylene glycol.

[0045] Furthermore, in the above formula (I), the specific value of n can 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. In addition, it can be less than 500, less than 450, less than 400, less than 300, or less than 250.

[0046] In this invention, specific examples of the polyalkylene glycol being polyethylene glycol include, for example, PEG-6, PEG-8, PEG-20, PEG-32, PEG-75, PEG-150, PEG-240, and PEG-400, but are not limited to these. It should be noted that in this specification, the numerical part following "PEG-" indicates the number-average degree of polymerization.

[0047] In the compositions of the present invention, a mixture of two or more polyethylene glycols may be used. Furthermore, in one embodiment of the present invention, the polyethylene glycol preferably comprises PEG-20. Further, for example, from the viewpoint of reducing stickiness and further improving usability, the polyethylene glycol preferably comprises at least one selected from PEG-75, PEG-150, PEG-240, and PEG-400.

[0048] In the composition of the present invention, the content of polyalkylene glycol in the aqueous phase is 10% by mass or more. More specifically, the polyalkylene glycol relative to the aqueous phase as a whole can be 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. Alternatively, it can be 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.

[0049] Furthermore, the content of polyalkylene glycol is not particularly limited relative to the overall composition of the present invention. For example, it can be more than 2.0% by mass, more than 5.0% by mass, more than 8.0% by mass, more than 10% by mass, more than 12% by mass, more than 14% by mass, more than 15% by mass, more than 18% by mass, more than 20% by mass, more than 25% by mass, or more than 30% by mass. Alternatively, it can be less than 30% by mass, less than 28% by mass, less than 25% by mass, less than 20% by mass, less than 15% by mass, or less than 10% by mass.

[0050] Furthermore, in the composition of the present invention, the content of polyalkylene glycol is not particularly limited relative to 100 parts by weight of the ultraviolet absorber contained in the oil phase described later. For example, it can be 25 parts by weight or more, 28 parts by weight or more, 30 parts by weight or more, 32 parts by weight or more, 35 parts by weight or more, 37 parts by weight or more, 40 parts by weight or more, 42 parts by weight or more, 45 parts by weight or more, 47 parts by weight or more, 50 parts by weight or more, 52 parts by weight or more, 55 parts by weight or more, 57 parts by weight or more, 60 parts by weight or more, 62 parts by weight or more, 65 parts by weight or more, 67 parts by weight or more, or 70 parts by weight or more. Alternatively, it can be 300 parts by weight or less, 250 parts by weight or less, 200 parts by weight or less, 150 parts by weight or less, 100 parts by weight or less, or 50 parts by weight or less.

[0051] [Other aqueous phase components]

[0052] In addition to the polyalkylene glycols described above, the compositions of the present invention may further contain other aqueous phase components, provided that the effects of the present invention are not impaired. Examples of other aqueous phase components are described below, but the present invention is not limited to these examples.

[0053] (water)

[0054] The compositions of the present invention may further include water as an aqueous phase component.

[0055] As water, there are no particular restrictions; it can be, for example, water used in cosmetics and pharmaceuticals. Examples of water types that can be used include ion-exchanged water, distilled water, ultrapure water, and tap water.

[0056] In the composition of the present invention, the content of water is not particularly limited. For example, it can be 5.0% or more by mass, 10% or more by mass, 12% or more by mass, or 15% or more by mass relative to the whole composition. In addition, it can be 40% or less by mass, 35% or less by mass, 30% or less by mass, 25% or less by mass, 20% or less by mass, or 15% or less by mass.

[0057] (lower alcohols)

[0058] The compositions of the present invention may further include lower alcohols as aqueous phase components.

[0059] In this invention, the term "lower alcohol" refers to alcohols with 5 or fewer carbon atoms, such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, tert-butanol, etc.

[0060] In the composition of the present invention, when a lower alcohol is included, its content is not particularly limited. For example, relative to the whole composition, it can be 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. In addition, it can 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.

[0061] [Oil phase]

[0062] In the composition of the present invention, the content of the oil phase is not particularly limited. For example, it can be 50% or more by mass, 55% or more by mass, 60% or more by mass, 65% or more by mass, or 70% or more by mass relative to the whole composition. Alternatively, it can be 90% or less by mass, 85% or less by mass, 80% or less by mass, or 75% or less by mass.

[0063] (UV absorber)

[0064] The compositions of the present invention contain an ultraviolet absorber in the oil phase. By including the ultraviolet absorber, the compositions of the present invention achieve ultraviolet absorption effects.

[0065] In the compositions of the present invention, the ultraviolet absorber is not particularly limited, and examples include, for instance, benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylene camphor derivatives, benzylene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, o-aminobenzoyl derivatives, imidazoline derivatives, benzylene malonate 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.

[0066] Examples of benzoic acid derivatives include, but are not limited to, ethyl p-aminobenzoic acid (PABA), dihydroxypropyl pABA ethyl ester, dimethyl pABA ethylhexyl ester, pABA glyceryl ester, PEG-25-PABA, and diethylaminohydroxybenzoyl hexyl benzoate.

[0067] Examples of salicylic acid derivatives include ethylhexyl salicylate, homosalyl salicylate, dipropyl glycol salicylate, and TEA salicylate, but these are not limited to these.

[0068] Examples of cinnamic acid derivatives include octyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinnoxalate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzylidene malonate, but are not limited to these.

[0069] Examples of dibenzoylmethane derivatives include 4-tert-butyl-4'-methoxydibenzoylmethane, but it is not limited to these.

[0070] Examples of β,β-diphenylacrylate derivatives include octocrylene, but are not limited to these.

[0071] Examples of benzophenone derivatives include benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzophenone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9 and benzophenone-12, but are not limited to these.

[0072] Examples of benzyl camphor derivatives include terephthalic acid dicamphor sulfonic acid, but it is not limited to these.

[0073] Examples of benzylidene camphor derivatives include 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid, methyl camphor benzyl ammonium sulfate, terephthalimide dicamphor sulfonic acid, and polyacrylamide methylbenzylidene camphor, but are not limited to these.

[0074] Examples of phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid and disodium phenyldibenzimidazole tetrasulfonic acid, but these are not the only ones that can be identified.

[0075] Examples of triazine derivatives include bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazine ketone, diethylhexylbutamidotriazine ketone, and 2,4,6-tris(diisobutyl-4'-aminobenzylmalonate)triazine, but are not limited to these.

[0076] Examples of phenylbenzotriazole derivatives include cresoltrazol trisiloxane and methylenebis(benzotriazole tetramethylbutylphenol), but are not limited to these.

[0077] Examples of anthranilyl derivatives include menthol anthranilic acid, but are not limited to these.

[0078] Examples of imidazoline derivatives include ethylhexyl dimethoxybenzyl dioxoimidazoline propionate, but are not limited to these.

[0079] Examples of benzyl malonic acid ester derivatives include, but are not limited to, polyorganosiloxanes having benzyl malonic acid ester functional groups (e.g., polysiloxane-15).

[0080] Examples of 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene, but are not limited to these.

[0081] In the compositions of the present invention, one type of ultraviolet absorber may be mixed in alone, or two or more types may be mixed in.

[0082] In the compositions of the present invention, the content of the ultraviolet absorber in the oil phase is not particularly limited. Specifically, for example, relative to the total oil phase, the ultraviolet absorber may be 2.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, 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, or 20% by mass or more. Alternatively, it may be 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, 20% by mass or less, or 15% by mass or less.

[0083] Furthermore, the content of the ultraviolet absorber is not particularly limited relative to the overall composition of the present invention. For example, it can be 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, 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, 10% by mass or more, 11% by mass or more, 12% by mass or more, or 13% by mass or more. Alternatively, it can be 30% by mass or less, 25% by mass or less, 20% by mass or less, or 15% by mass or less.

[0084] [Other oil phase components]

[0085] In addition to the ultraviolet absorber described above, the compositions of the present invention may further contain other oil phase components, provided that the effects of the present invention are not impaired. Examples of other oil phase components are described below, but the present invention is not limited to these examples.

[0086] (Silicone oil)

[0087] The compositions of the present invention may further comprise 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, usability issues such as stickiness can be improved, for example.

[0088] In this invention, "silicone oil" refers to a substance that has a main framework formed by siloxane bonds in an oil that can be used in cosmetics.

[0089] In this invention, the silicone oil can be either volatile or non-volatile.

[0090] Furthermore, in this invention, the term "volatility" of an oil refers to an oil with a boiling point below 260°C at atmospheric pressure (1 atmosphere). Conversely, in this invention, the term "non-volatility" of an oil refers to an oil with a boiling point above 260°C at atmospheric pressure (1 atmosphere).

[0091] In this invention, the silicone oil can be acyclic silicone oil (e.g., chain silicone oil or branched silicone oil, etc.) or cyclic silicone oil. Preferably, the silicone oil is acyclic silicone oil, for example.

[0092] In this invention, specific examples of silicone oils include, for example, noncyclic silicone oils such as polydimethylsiloxane (also known as "polydimethylsiloxane"), methylphenyl polysiloxane and methylhydropolysiloxane, cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecylcyclohexasiloxane, and mixtures of two or more thereof, but are not limited to these.

[0093] In the compositions of the present invention, the content of silicone oil is not particularly limited. For example, relative to the total oil phase, the silicone oil may be 5.0% by mass or more, 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, 80% by mass or more, or 90% by mass or more. Alternatively, it may be 95% by mass or less, 90% by mass or less, 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.

[0094] Furthermore, the content of silicone oil is not particularly limited relative to the overall composition of the present invention. For example, it can be 10% or more by mass, 20% or more by mass, 30% or more by mass, 40% or more by mass, 50% or more by mass, or 55% or more by mass. Alternatively, it can be less than 85% by mass, less than 80% by mass, less than 75% by mass, less than 70% by mass, less than 65% by mass, or less than 60% by mass.

[0095] (hydrocarbon oil)

[0096] The compositions of the present invention may further comprise hydrocarbon oil as an oil phase component. It should be noted that, in the present invention, "hydrocarbon oil" refers to hydrocarbon oil excluding the aforementioned ultraviolet absorber and the polar oil described later.

[0097] In this invention, the hydrocarbon oil can be either volatile or non-volatile.

[0098] In this invention, specific examples of hydrocarbon oils include, but are not limited to, decane, dodecane, isododecane, isohexadecane, liquid paraffin, hydrogenated polydecene, hydrogenated dimer decene, squalane, squalene, paraffin, and mixtures of two or more thereof.

[0099] In the composition of the present invention, when hydrocarbon oil is included, its content is not particularly limited. For example, it can be 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 relative to the whole composition. In addition, it can be 20% by mass or less, 15% by mass or less, 10% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, or 5.0% by mass or less.

[0100] (Polar oil)

[0101] The compositions of the present invention may further comprise polar oils as oil phase components. It should be noted that, in the present invention, "polar oil" refers to a highly polar oil component suitable for use in cosmetics, excluding the aforementioned UV absorbers and silicones; for example, an oil component with an IOB value of 0.10 or higher, 0.11 or higher, 0.12 or higher, or 0.13 or higher. Furthermore, the IOB value of the polar oil may be 0.50 or lower, 0.45 or lower, or 0.40 or lower.

[0102] It should be noted that the so-called IOB value is short for Inorganic / Organic Balance, which is a value that represents the ratio of inorganic value to organic value, and serves as an indicator of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. Regarding the "inorganic value" and "organic value" respectively, for example, the "inorganic value" and "organic value" corresponding to various atoms or functional groups can be set in such a way that the "organic value" for one carbon atom in the molecule is set to 20 and the "inorganic value" for one hydroxyl group is set to 100. The "inorganic value" and "organic value" of all atoms and functional groups in the organic compound are accumulated, and the IOB value of the organic compound can be calculated (see, for example, Yoshio Koda, "Organic Concept Map - Basics and Applications -", ​​pp. 11-17, Sankyo Publishing, 1984).

[0103] Examples of polar oils include ester oils, but are not limited to these.

[0104] In addition, specific examples of ester oils include tripropylene glycol dipentanoate, isononyl isononanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, acetylated lanolin, isocetyl stearate, and isostearyl isostearate. Cetyl alcohol ester, 12-hydroxystearic acid cholesterol ester, cetyl ethylhexanoate, ethylene glycol di-2-ethylhexanoate, pentaerythritol dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearic acid, neopentyl glycol didecanoate, diisostearic acid, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearic acid, pentaerythritol tetra-2-ethylhexanoate Triglycerides (tri-2-ethylhexanoate), tricaprylic acid glycerides, triisopalmitoate glycerides, trimethylolpropane triisostearate, cetyl ester of 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristic acid glycerides, tri-2-heptylundecanoate glycerides, castor oil fatty acid methyl ester, oleic acid oleyl alcohol ester, acetylglycine ester, 2-heptylundecyl palmitate, diisobutyl adipate, 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, C12-15 alkyl benzoate, 2-ethylhexyl succinate, and triethyl citrate, etc., but not limited to these.

[0105] In the composition of the present invention, when polar oil is included, its content is not particularly limited. For example, it can be 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, 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, relative to the whole composition. In addition, it can be 20% by mass or less, 15% by mass or less, or 10% by mass or less.

[0106] (Other oil components)

[0107] In addition to the oils mentioned above, the compositions of the present invention may further include, for example, hexanoic acid, caprylic acid, capric acid, 2-ethylhexanoic acid, lauric acid, tridecanoic acid, isotriadecanoic acid, myristic acid, palmitic acid, isopalactitic acid, stearic acid, isostearic acid, eicosanoic acid, behenic acid, tetracosanoic acid, myristoleic acid, palmitoleic acid, oleic acid, transoleic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid, hydroxystearic acid, coconut oil fatty acids, palm kernel oil fatty acids, hardened palm kernel oil fatty acids, palm oil fatty acids, beef tallow fatty acids, hardened beef tallow fatty acids, lard fatty acids, castor oil fatty acids, hardened castor oil fatty acids, olive fruit oil, sunflower oil, palm oil, palm kernel oil, safflower seed oil, castor oil, hardened castor oil, coconut oil, camellia seed oil, cocoa seed butter, shea butter, etc.

[0108] [Other added ingredients]

[0109] In the compositions of the present invention, other additives may be further blended into the above-mentioned aqueous phase components and / or oil phase components, provided that the effects of the present invention are not impaired. Hereinafter, other additives are described exemplarily, but the present invention is not limited to these examples.

[0110] (Ultraviolet scattering agent)

[0111] The compositions of the present invention may further comprise ultraviolet (UV) scattering agents. These UV scattering agents can be dispersed in the oil phase. Furthermore, by including UV scattering agents, the UV protection effect of the compositions of the present invention can be further improved.

[0112] In this invention, the ultraviolet scattering agent is not particularly limited and can be, for example, a metal oxide particle selected from at least one of titanium oxide, zinc oxide, iron oxide and cerium oxide.

[0113] Furthermore, the ultraviolet scattering agent can be a substance whose surface has been hydrophobically treated. Here, the hydrophobic treatment can be performed using any known hydrophobic surface treatment agent, such as fluorine compound treatment, organosilicon treatment, organosilicon 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, treatment with organosilicon or organosilicon resin, treatment with silane or silazane compounds, and metal soap treatment such as aluminum isostearate are preferred.

[0114] In this invention, when the ultraviolet scattering agent is a particle, the particle size (i.e., the average particle size) is not particularly limited, and can be, for example, 5 nm or more, 10 nm or more, or 15 nm or more, or less than 200 nm, 100 nm or less, or less than 50 nm. It should be noted that the "average primary particle size" can be calculated as the diameter of the equivalent circle of the projected area of ​​the primary particles in the SEM image. Furthermore, the shape of the ultraviolet scattering agent particles is not particularly limited, and examples include spherical, plate-like, rod-like, spindle-shaped, needle-like, and irregular shapes.

[0115] In the composition of the present invention, when an ultraviolet scattering agent is included, its content is not particularly limited. For example, it can be 1.0% or more by mass, 5.0% or more by mass, 10% or more by mass, 15% or more by mass, or 18% or more by mass relative to the whole composition. In addition, it can be 30% or less by mass, 25% or less by mass, or 20% or less by mass.

[0116] (surfactant)

[0117] The compositions of the present invention may further comprise surfactants. By comprising surfactants, the surfactants can, depending on their type, emulsify the aqueous phase components and / or disperse powders or particles in the oil phase.

[0118] In this invention, the surfactant is not particularly limited, and surfactants with HLB values ​​of, for example, 1.0 to 9.0 can be used. Furthermore, the specific HLB value of the surfactant is not particularly limited; for example, it can be 1.0 or higher, 2.0 or higher, 3.0 or higher, 4.0 or higher, or 5.0 or higher, and it can be 9.0 or lower, 8.0 or lower, 7.0 or lower, 6.0 or lower, or 5.0 or lower. Additionally, the HLB (Hydrophilic-Lipophilic Balance) value can be defined using the Griffith method.

[0119] As a surfactant with an HLB value of 1.0 or higher and 9.0 or lower, there are no particular limitations, and at least one of the following can be used, for example: polyether-modified silicone, dehydrated sorbitan fatty acid ester, polyethylene glycol fatty acid ester, glycerol fatty acid ester, and polyoxyethylene-cured castor oil.

[0120] Examples of polyether-modified organosilicones include, but are not limited to, PEG-9 polydimethylsiloxane (HLB value: 4.0), lauryl PEG-9 polydimethylsiloxane (HLB value: 3.0) and PEG-10 polydimethylsiloxane (HLB value: 4.5).

[0121] Examples of sorbitan fatty acid esters include, but are not limited to, PEG-4 triisostearate sorbitan ester (HLB value: 3.0).

[0122] 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).

[0123] Examples of glycerol fatty acid esters include diisostearate polyglycerol-2 ester (HLB value: 4.0) and glyceryl stearate (HLB value: 4.0 to 6.0), but are not limited to these.

[0124] Examples of polyoxyethylene-cured castor oil include, but are not limited to, PEG-20 triisostearate hydrogenated castor oil (HLB value: 6.0) and PEG-10 hydrogenated castor oil (HLB value: 7.0).

[0125] In the composition of the present invention, when a surfactant is included, its content is not particularly limited. For example, relative to the whole composition, it can be 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, 1.0% by mass or more, 1.1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, 1.4% by mass or more, 1.5% by mass or more, 1.6% by mass or more, 1.7% by mass or more, 1.8% by mass or more, 1.9% by mass or more, or 2.0% by mass or more. In addition, it can be 10% by mass or less, 9.0% 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.

[0126] (Oil-phase thickener)

[0127] The compositions of the present invention may further include an oil-phase thickener. By including an oil-phase thickener, for example, the oil can be thickened and / or gelled. Furthermore, the oil-phase thickener can function as an emulsifying aid.

[0128] As an oil phase thickener, there are no particular limitations, and one or more of the following can be used: lithium distearate dimethylammonium montmorillonite, lithium distearate dimethylammonium montmorillonite, lithium benzyl dimethylstearium montmorillonite, magnesium aluminum silicate treated with distearate dimethylammonium chloride, palmitic dextrin ester, oleic dextrin ester, stearic dextrin ester, myristic dextrin ester, (palmitic acid / ethylhexanoic acid) dextrin ester, (palmitic acid / hexyldecanoic acid) dextrin ester, stearoyl inulin, dibutyllauroyl glutamine, sucrose triacetate tetrastearate, and dibutylethylhexanoyl glutamine.

[0129] When the composition of the present invention contains an oil phase thickener, its content is not particularly limited. For example, relative to the whole composition, it can be 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, or 1.0% by mass or more. In addition, it can be 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

[0130] (Add any ingredients)

[0131] In addition to the above, although not limited, the compositions of the present invention may also be appropriately blended with any other ingredients commonly used in cosmetics, such as powder ingredients (e.g., usable powders, further for example, usable powders such as corn starch, polydimethylsiloxane-treated silica), pharmaceutical ingredients (e.g., whitening agents, skin beautifying agents, etc.), preservatives, chelating agents, stabilizers, metal ion blocking agents, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant auxiliaries, fragrances, etc.

[0132] <Method for manufacturing the composition of the present invention>

[0133] The compositions of the present invention can be manufactured using conventional methods for water-in-oil emulsion cosmetics, and the emulsification method is not particularly limited. For example, methods include heating the aqueous and oil phases as needed, slowly adding the aqueous phase to the oil phase, emulsifying with an emulsifier, and cooling the heated mixture to room temperature.

[0134] <use>

[0135] The compositions of the present invention are suitable for use as cosmetics or as raw materials thereof. Furthermore, because the compositions of the present invention can simultaneously provide moisturizing effects and further enhance UV absorption, they are particularly suitable for use as sunscreen cosmetics, primers, concealers, or foundations, or as raw materials thereof. In one embodiment of the present invention, the compositions of the present invention can be sunscreen cosmetics.

[0136] Furthermore, the dosage form of the cosmetics involved in this invention is not particularly limited, and can be, for example, liquid, gel, lotion, cream, solid, or balm.

[0137] Furthermore, the cosmetics involved in this invention can be a two-layer type that is vibrated and / or mixed during use, or a type that can be used directly.

[0138] Example

[0139] The following examples illustrate the invention in further detail, but the invention is not limited to these examples. It should be noted that, unless otherwise specified, the mixing amounts in the tables are expressed as a percentage by mass.

[0140] Examples 1-8 and Comparative Examples 1-10

[0141] Based on the formulations in Tables 1 and 2, the water-in-oil emulsified cosmetic compositions of Examples 1-8 and Comparative Examples 1-10 were prepared.

[0142] It should be noted that the number-average molecular weights of the polyalkylene glycols used in Table 1 are as follows: PEG-6: 300 PEG-8: 400 A 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 Evaluation of Ultraviolet Absorption Effect The prepared compositions were administered at 2 mg / cm³ 2 The appropriate amount of the product was evenly applied to a PMMA plate simulating skin, specifically a PMMA plate (SPF MASTER PA01, manufactured by Shiseido Co., Ltd.) with grooves corresponding to skin surfaces, and left to dry for 15 minutes. Then, for each sample composition, the absorbance integral value from 280 to 400 nm was determined using a spectrophotometer (U-3500 self-recording spectrophotometer, manufactured by Hitachi, Ltd.).

[0143] Using the composition without added humectant as a control, the ratio of the absorbance integral value of each example and comparative example to the control (e.g., "absorbance integral value of Example 1 / absorbance integral value of the control") was calculated and is shown in Tables 1 and 2.

[0144] Furthermore, using the ratio of the absorbance integral value to the control obtained above, the ultraviolet absorption effect of each embodiment and comparative example was evaluated based on the following criteria, and the results are shown in Tables 1 and 2.

[0145] (Evaluation Criteria)

[0146] Ratio of absorbance integral value to control Cases with a probability of 105% or higher are designated as "A". Cases with a percentage of 100% or higher but less than 105% are designated as "B". Set the case of less than 100% to "C".

[0147] <User experience (non-sticky) review>

[0148] In addition, the user experience (non-stickiness) was evaluated for each composition as an additional effect. More specifically, professional reviewers applied each composition to the face and evaluated the stickiness after application based on the following criteria. The evaluation results are shown in Tables 1 and 2.

[0149] (Evaluation Criteria)

[0150] "A" did not feel or did not feel stickiness easily; "B" feels slightly sticky; “C” feels very sticky.

[0151] [Table 1]

[0152] [Table 2]

[0153] As clearly shown in Tables 1 and 2, the compositions of Examples 1-8 (Table 1) all exhibited improved UV absorption compared to the control. Furthermore, it is evident that the composition of Example 4, which used PEG-20 as the polyalkylene glycol, demonstrated the most superior UV absorption effect. It should be noted that these compositions, containing polyalkylene glycols, are considered to have a moisturizing effect. In particular, polyalkylene glycols with a number average molecular weight of 4000 or less are known for their water-retention properties, thus providing a moisturizing effect. Additionally, polyalkylene glycols with a number average molecular weight exceeding 4000 are generally known for their thickening properties, and therefore also provide a moisturizing effect.

[0154] Furthermore, it is known that the compositions of Examples 4-8 have the best user experience (non-sticky).

[0155] Compared to the compositions of the examples, the compositions of Comparative Examples 1-10 (Table 2) did not improve the ultraviolet absorption effect compared to the control. This can be attributed to the fact that although various moisturizers other than polyalkylene glycols were mixed in these comparative example compositions, polyalkylene glycols were not mixed in.

[0156] Examples 9-11 and Comparative Examples 11-12

[0157] The compositions of Examples 9-11 and Comparative Examples 11-12 were prepared based on the formulations in Table 3. As described above, the ultraviolet absorption effect of each composition was evaluated. It should be noted that the ratios of the absorbance integral values ​​of Examples 9-11 and Comparative Examples 11-12 to the control, as well as the ultraviolet absorption effects of these examples and comparative examples, are shown in Table 3.

[0158] [Table 3]

[0159] As clearly shown in Table 3, the compositions of Examples 9-11 all exhibited improved UV absorption compared to the control. It should be noted that these compositions, containing polyalkylene glycols, are considered to have moisturizing effects.

[0160] Compared to these examples, the compositions of Comparative Examples 11 and 12 did not improve the ultraviolet absorption effect compared to the control. This can be attributed to the fact that the content of polyalkylene glycol in the aqueous phase of these comparative examples was less than 10% by mass.

[0161] In other words, it can be considered that the composition of Comparative Examples 11 and 12 contains insufficient amounts of polyalkylene glycol, thus failing to achieve the enhanced ultraviolet absorption effect due to the polyalkylene glycol. It should be noted that the composition of Comparative Example 12 contains more polyalkylene glycol than Comparative Example 11, and its absorbance integral value relative to the control is also larger, suggesting that if the composition is adjusted to increase the content of polyalkylene glycol in the aqueous phase, an enhanced ultraviolet absorption effect can be obtained.

[0162] Example 12, Reference Example 1, and Comparative Examples 13-14

[0163] The compositions of Examples 12, Reference Example 1, and Comparative Examples 13-14 were prepared based on the formulations in Table 4. As described above, the ultraviolet absorption effect of each composition was evaluated. Control a was used as a control for Examples 12 and Comparative Example 13. It should be noted that the compositions of Reference Example 1 and Comparative Example 14 were applied to a PMMA plate without corresponding skin grooves, instead of the aforementioned PMMA plate (a PMMA plate with irregularities corresponding to skin grooves). Furthermore, control b was used as a control for Reference Example 1 and Comparative Example 14. A PMMA plate without corresponding skin grooves was also used when measuring the composition of control b.

[0164] The evaluation results of the obtained ultraviolet absorption effect are shown in Table 4.

[0165] [Table 4]

[0166] As can be clearly seen from the results in Table 4, the composition of Example 12 showed improved ultraviolet absorption compared to control a.

[0167] However, in Reference Example 1, which has the same composition as Example 12, the coating was applied to a PMMA plate without grooves or depressions, and the results showed that it did not improve the UV absorption effect compared to Control b. The reason for this is analyzed as follows. That is, it is presumed that the surface of the PMMA plate without grooves or depressions is originally flat, so the polyalkylene glycol contained in the composition becomes lumpy during the drying process, thus making the coating film uneven.

[0168] Based on these results, it can be concluded that the compositions of Example 12 and Reference Example 1, when used as cosmetics for skin, can exert an enhanced UV absorption effect due to the polyalkylene glycol contained in the compositions.

[0169] On the other hand, it can be seen that in Comparative Examples 13 and 14, which did not contain polyalkylene glycol, the UV absorption effect was not improved relative to their respective controls, whether the PMMA plate had or did not have the corresponding grooves.

[0170] Prescription Examples

[0171] Hereinafter, illustrative examples of formulations of the compositions of the present invention are given. However, the present invention is not limited in any way by the following formulations.

[0172] <Prescription Example 1>

[0173] [Table 5]

[0174] <Prescription Example 2>

[0175] [Table 6]

[0176] <Prescription Example 3>

[0177] [Table 7]

[0178] <Prescription Example 4>

[0179] [Table 8]

Claims

1. A water-in-oil emulsion cosmetic composition, wherein the aqueous phase contains a polyalkylene glycol. The content of the polyalkylene glycol in the aqueous phase is more than 10% by mass, and The oil phase contains ultraviolet absorbers.

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

3. The water-in-oil emulsion cosmetic composition according to claim 1 or 2, further comprising silicone oil.

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

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

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

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

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