Water-in-oil type sunscreen cosmetic

Abstract

To provide an oil-in-water type sunscreen cosmetic having no squeaky feeling during application, excellent sense of use such as skin compatibility and emulsion stability while having good ultraviolet protection performance.SOLUTION: There is provided an oil-in-water type sunscreen cosmetic which comprises (A) 0.5 mass% or more of a higher fatty acid salt, (B) 0.5 mass% or more of a surfactant other than the component (A), (C) an organic ultraviolet absorber and (D) an oily agent other than the component (C), where the component (B) preferably includes one or two or more selected from an alkylsulfate ester salt, a fatty acid monoglyceride, a polyoxyalkylene alkyl ether type nonionic surfactant and a fatty acid polyethylene glycol type nonionic surfactant.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oil-in-water type sunscreen cosmetic, and more specifically, to an oil-in-water type sunscreen cosmetic that has good ultraviolet ray protection ability, has no squeaking feeling during application, has excellent usability such as skin affinity, and has stability over time.

Background Art

[0002] In recent years, oil-in-water type sunscreen cosmetics have increased in number due to their good usability. However, when a large amount of ultraviolet absorber is blended, there are problems in usability such as irritation in some people, stickiness, and squeaking (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to solve the above problems, and specifically, to provide an oil-in-water type sunscreen cosmetic that has good ultraviolet ray protection ability, has no squeaking feeling during application, has excellent usability such as skin affinity, and has stability over time.

Means for Solving the Problems

[0005] As a result of intensive studies, the present inventors have found that an oil-in-water type emulsified cosmetic capable of solving the above problems can be obtained by combining and blending a higher fatty acid salt, a surfactant other than the higher fatty acid salt, an ultraviolet absorber, and a paste-like oil agent, and have completed the present invention.

[0006] That is, the first invention of the present application is an oil-in-water type sunscreen cosmetic characterized by containing the following components (A) to (D). (A) Higher fatty acid salt: 0.5% by mass or more (B) Surfactant other than component (A): 0.5% by mass or more (C) Organic ultraviolet absorber (D) Oil agent other than component (C)

[0007] Preferably, the component (B) contains one or more selected from alkyl sulfate salts, fatty acid monoglycerides, polyoxyalkylene alkyl ether type nonionic surfactants, and fatty acid polyethylene glycol type nonionic surfactants, and it is an oil-in-water type sunscreen cosmetic.

[0008] More preferably, the component (D) is an oil agent in a paste (semi-solid) state at 25°C, and it is an oil-in-water type sunscreen cosmetic containing one or two selected from petrolatum and di(phytostearyl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate.

Effect of the Invention

[0009] The oil-in-water type sunscreen cosmetic of the present invention has good ultraviolet protection ability, has no squeaking feeling during application, is excellent in the feeling of use such as skin compatibility, and is excellent in stability over time.

Mode for Carrying Out the Invention

[0010] Hereinafter, the oil-in-water type sunscreen cosmetic of the present invention will be described in detail.

[0011] In this specification, "squeaking feeling" means feeling a catch on the skin during application, and "skin compatibility" means having no stickiness and having an appropriate moist feeling. Also, "stability over time" means maintaining an emulsified state without discoloration, odor change, or separation at 50°C for one month.

[0012] The oil-in-water type sunscreen cosmetic of the present invention contains the following components. (A) Higher fatty acid salt: 0.5% by mass or more (B) Surfactant other than component (A): 0.5% by mass or more (C) Organic UV absorber (D) Oil agent other than component (C)

[0013] <(A) Higher fatty acid salt> Component (A) used in the present invention is a higher fatty acid salt. The higher fatty acid salt is used to reduce the harsh feeling and improve the skin affinity.

[0014] Higher fatty acids are preferably those having 12 to 22 carbon atoms from the viewpoints of skin affinity and stability over time, and more preferably those having 12 to 18 carbon atoms. Specific examples include, for example, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid, isocaprylic acid, isopalmitic acid, isocapric acid, isoundecanoic acid, isolauric acid, isotridecyl acid, isomyristic acid, isopentadecylic acid, isopalmitic acid, isomargaric acid, isostearic acid, isononadecanoic acid, isoarachidic acid, isoheneicosanoic acid, isobehenic acid and the like.

[0015] Examples of the salt in the higher fatty acid salt include alkali metal salts such as sodium salt and potassium salt; alkanolamine salts such as monoethanolamine salt, diethanolamine salt and triethanolamine salt.

[0016] The blending amount of component (A) is 0.5% by mass or more, preferably 5.0% by mass or less, based on the mass of the water-in-oil type sunscreen cosmetic. If it is 0.5% by mass or more, the emulsion stability is improved, and if it is 5.0% by mass or less, the feel during use is good.

[0017] <(B) Surfactant other than component (A)> Component (B) used in the present invention is a surfactant other than component (A). Component (B) is used in combination with component (A) to improve the stability over time.

[0018] Examples of component (B) include alkyl sulfate salts, fatty acid monoglycerides, polyoxyalkylene alkyl ether type nonionic surfactants, and fatty acid polyethylene glycol type nonionic surfactants.

[0019] The blending amount of component (B) is 0.5% by mass or more, preferably 10% by mass or less, based on the mass of the water-in-oil type sunscreen cosmetic. If it is 0.5% by mass or more, the emulsion stability is good, and if it is 10% by mass or less, stickiness is less likely to be felt.

[0020] <(C) Organic UV absorber> Component (C) used in the present invention is an organic UV absorber, which may be either liquid or solid. Component (C) is used to protect the skin from harmful UV rays and the quality of cosmetics.

[0021] Examples of liquid organic UV absorbers include 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, isopropyl diisopropyl paramethoxycinnamate cinnamic acid ester mixture, methyl trimethoxycinnamate bis(trimethylsiloxy)silylisopentyl, amyl p-dimethylaminobenzoate, 2-ethylhexyl p-dimethylaminobenzoate, ethylene glycol salicylate, 2-ethylhexyl salicylate, benzyl salicylate, homomenthyl salicylate, octocrylene, dimethyldiethylbenzalmalonate, etc. Among these, 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl salicylate, homomenthyl salicylate, octocrylene, and dimethyldiethylbenzalmalonate are preferred, more preferably 2-ethylhexyl paramethoxycinnamate, octocrylene, and dimethyldiethylbenzalmalonate, and even more preferably 2-ethylhexyl paramethoxycinnamate. The liquid organic UV absorber can be contained alone or in an appropriate combination of two or more.

[0022] Examples of the solid organic ultraviolet absorber include hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 4-tert-butyl-4'-methoxydibenzoylmethane, and 2-ethylhexyl dimethoxybenzylidenedioxoimidazolidinepropionate. The solid organic ultraviolet absorber can be contained alone or in an appropriate combination of two or more kinds.

[0023] Among these, hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 4-tert-butyl-4'-methoxydibenzoylmethane are preferable, and hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, and 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine are more preferable. Note that the solid organic ultraviolet absorber in the present invention is considered to exist in a liquid state in the cosmetic.

[0024] Examples of commercially available products of these components include Uvinul MC80 (2-ethylhexyl paramethoxycinnamate; manufactured by BASF), Uvinul Aplus Glanular (hexyl ester of 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid; manufactured by BASF), TINOSORBS (2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine; manufactured by BASF), Uvinul T-150 (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine; manufactured by BASF), Soft-Screen DH (2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate; manufactured by Ajinomoto Co., Inc.), PARSOL 1789 (4-tert-butyl-4'-methoxydibenzoylmethane; manufactured by DSM), and the like.

[0025] (C) The blending amount of the component is preferably 1 to 30% by mass, more preferably 5 to 20% by mass or less, based on the mass of the water-in-oil type sunscreen cosmetic. If it is 1% by mass or more, a certain ultraviolet ray protection effect can be obtained, and if it is 30% by mass or less, a good feeling in use can be obtained without stickiness.

[0026] <(D) Oil agent other than component (C)> The component (D) used in the present invention is an oil agent other than the component (C). The component (D) is used to improve skin compatibility.

[0027] Examples of the oil agent other than the component (C) include, for example, liquid oils and oils in paste form (semi-solid) at 25°C. In particular, oils in paste form (semi-solid) at 25°C are preferred, and examples include petrolatum and di(phytostearyl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate.

[0028] (D) The blending amount of the component is preferably 0.1 to 10% by mass, based on the mass of the water-in-oil type sunscreen cosmetic. If it is 0.1% by mass or more, the feel during use is good, and if it is 10% by mass or less, stickiness is hardly felt. ​

[0029] <Other components> The water-in-oil type sunscreen cosmetic of the present invention contains the above-described components as essential constituent components, and other components such as anionic surfactants, amphoteric surfactants, nonionic surfactants, oils, polymer compounds, thickeners, powders (dyes, resins, pigments), preservatives, fragrances, humectants, physiologically active components, salts, solvents, antioxidants, chelating agents, pearling agents, neutralizing agents, pH adjusters, insect repellents, enzymes and the like can be appropriately blended in the composition as long as the object of the present invention is not impaired.

[0030] In addition, physiologically active components can be appropriately blended in the water-in-oil type sunscreen cosmetic of the present invention as long as the object of the present invention is not impaired. A physiologically active substance is a substance that imparts some physiological activity to the skin when applied to the skin, and examples thereof include anti-aging agents, tightening agents, antioxidants, humectants, blood circulation promoters, antibacterial agents, bactericides, desiccants, cooling agents, warming agents, vitamins, amino acids, wound healing promoters, irritation relievers, analgesics, cell activators, enzyme components and the like.

[0031] In addition, the bioactive ingredients that can be incorporated into the skin cosmetics of the present invention are not particularly limited in terms of their type, but it is preferable to use extracts derived from the roots, stems, leaves, flowers, fruits, and seeds of plants. Examples of extracts derived from the roots, stems, leaves, flowers, fruits, and seeds of plants include, for example, Houttuynia cordata extract, avocado extract, amacha extract, hollyhock extract, arnica extract, aloe extract, Japanese knotweed extract, fennel extract, schizandra extract, barley extract, chickweed extract, oyster extract, kakkon extract, chamomile extract, carrot extract, licorice extract, strawberry extract, kiwi extract, cucumber extract, ginger extract, quince seed extract, brown sugar extract, rice bran extract, fermented rice bran extract, maple extract, sugarcane extract, perilla extract, peony extract, honeysuckle extract, common chickweed extract, Japanese hawthorn extract, Japanese ivy extract, sage extract, soybean extract, thyme extract, tea extract, camellia extract, tuberose extract, dokudami extract, tomato extract, rose extract, witch hazel water, rose extract, Parietaria judaica extract, loquat extract, grape extract, loofah extract, button mushroom extract, hop extract, momordica extract, peach leaf extract, Jerusalem artichoke extract, yokukinin extract, lemon extract, rosemary extract, Roman chamomile extract, etc.

Examples

[0032] Hereinafter, the present invention will be specifically described by way of examples and comparative examples, but the present invention is not limited to these examples. Prior to the examples, the test methods and evaluation methods employed in each example will be described.

[0033] <UV protection ability> (Evaluation method) It was evaluated by the following in vitro SPF measurement. The application method was carried out on a PMMA plate in accordance with ISO24443 for each test shown in the examples and comparative examples. For the samples dried for 30 minutes after coating, SPF measurements were performed using an SPF analyzer (UV-2000S manufactured by Labsphere). For each sample, the average value of 9 points was calculated and judged according to the following evaluation criteria. <Evaluation Criteria> ◎: (Average SPF value) = 30 or more ○: (Average SPF value) = 20 or more and less than 30 △: (Average SPF value) = 10 or more and less than 20 ×: (Average SPF value) < 10

[0034] <Evaluation test for the lack of creaking feeling during familiarity> (Evaluation method) For 5 professional panelists, the water-in-oil sunscreen cosmetic of the present invention was applied to the inner part of the forearm, and the "lack of creaking feeling during familiarity" when gently rubbed with a finger was evaluated. The test results were judged according to the following evaluation criteria using the number of people who answered "there is no creaking feeling during familiarity". <Evaluation Criteria> ◎: There are 4 or 5 panelists who recognized that there is no creaking feeling during familiarity. ○: There are 2 or 3 panelists who recognized that there is no creaking feeling during familiarity. △: There is 1 panelist who recognized that there is no creaking feeling during familiarity. ×: There are 0 panelists who recognized that there is no creaking feeling during familiarity.

[0035] <Evaluation test for good skin compatibility> (Evaluation method) For 5 professional panelists, the water-in-oil sunscreen cosmetic of the present invention was applied to the inner part of the forearm, and the "good skin compatibility" 1 minute after gently rubbing with a finger was evaluated. The test results were judged according to the following evaluation criteria using the number of people who answered "there is no stickiness during application and good skin compatibility". <Evaluation Criteria> ◎: There are 4 or 5 panelists who recognized that there is no stickiness during application and good skin compatibility. ○: There are 2 or 3 panelists who recognized that there is no stickiness during application and good skin compatibility. △: There is 1 panelist who recognized that there is no stickiness during application and good skin compatibility. ×: 0 panelists recognized that there was no stickiness during application and good skin affinity

[0036] <Stability Evaluation Test over Time> After standing in a constant temperature bath at 50°C for 1 month, the appearance state was confirmed and judged according to the following evaluation criteria. <Evaluation Criteria> ◎: No changes such as discoloration or odor change are observed at all ○: Some changes are observed, but there is no problem with stability △: Changes are observed, but oil floating or separation does not occur ×: Separation

[0037]

Table 1

[0038] As is clear from Table 1, all of the water-in-oil type sunscreen cosmetics of the examples using the components of the present invention had excellent performance. On the other hand, in the comparative examples lacking any of the essential components, they were inferior in terms of any of ultraviolet ray protection ability, non-grittiness during application and when getting used to it, and good skin affinity, and the object of the present invention could not be achieved.

[0039] Hereinafter, other formulation examples of the skin cosmetic of the present invention will be given. Regarding the water-in-oil type sunscreen cosmetics of the following formulation examples, when each item of the above ultraviolet ray protection ability, non-grittiness during application and when getting used to it, and good skin affinity was examined, all of them had excellent characteristics similar to those of the examples and were good.

[0040] Formulation Example 1 Water-in-oil type sunscreen cosmetic (1) Stearic acid 4.0% (2) Glyceryl stearate 5.0% (3) Potassium hydroxide 0.3% (4) 2-Ethylhexyl paramethoxycinnamate 12.0% (5) Hexyl 2-(4-diethylamino-2-hydroxybenzoyl) benzoate 2.0% (6) 2,4,6-Tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine 2.0% (7) 2,4-Bis{[4-(2-ethylhexyl)oxy-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine 2.0% (8) Petrolatum 3.0% (9) Cetearyl Alcohol 4.0% (10) BG 7.0% (11) Octyldodecyl Myristate 5.0% (12) Isononyl Isononanoate 1.0% (13) Dimethylpolysiloxane 1.0% (14) Hydrogenated Lecithin 0.8% (15) Phytosterol 0.08% (16) Tocopherol 0.1% (17) Ethanol 8.0% (18) Sodium Hyaluronate 0.2% (19) Disodium Edetate 0.01% (20) Purified Water Balance

[0041] (Production Method) (1), (2), (4), (5) to (9) and (11) to (16) were heated to 80°C and uniformly dissolved (Solution A). (3), (10), (19), (20) were heated to 80°C and uniformly dissolved (Solution B). Solution B was added to Solution A, and after uniformly dispersing with a homomixer, (17) and (18) were added and further uniformly dispersed with a homomixer to prepare a sunscreen O / W gel cream.

Claims

【Claim 1】 An oil-in-water type sunscreen cosmetic characterized by containing the following components (A) to (D). (A) Higher fatty acid salt: 0.5% by mass or more (B) A surfactant other than component (A), a combination of glyceryl stearate and ceteth-15: 0.5% by mass or more (C) Organic ultraviolet absorber (D) An oily agent that is paste-like (semi-solid) at 25°C, an oily agent containing one or two selected from petrolatum, di(phytostearyl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate.

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