Cosmetics

Abstract

To provide a cosmetic that has an improved UV-blocking effect and is particularly improved in light degradation.SOLUTION: A cosmetic contains: a UV absorber containing t-butyl methoxydibenzoylmethane; butyloctyl salicylate; and an alkylene oxide derivative.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a cosmetic comprising an ultraviolet absorber containing t-butylmethoxydibenzoylmethane, butyl octyl salicylate, and an alkylene oxide derivative.

Background Art

[0002] Protecting the skin from the harm of ultraviolet rays is one of the important issues in skin care and body care. Various UV care cosmetics have been developed to minimize the adverse effects of ultraviolet rays on the skin. Sunscreen cosmetics, which are a type of UV care cosmetics, block the UVA and UVB from reaching the skin by blending ultraviolet absorbers and ultraviolet scattering agents, and protect the skin from the harm of ultraviolet rays. Therefore, there is still a demand for UV care cosmetics having an ultraviolet protection effect even under severe ultraviolet conditions in outdoor activities such as swimming in a pool or the sea in summer and skiing in winter.

[0003] There are several types of ultraviolet absorbers, for example, ethylhexyl methoxycinnamate and octocrylene. Ethylhexyl methoxycinnamate and octocrylene are liquid ultraviolet absorbers mainly having an absorption wavelength in the UVB region, and are used in a very large number of sunscreen cosmetics due to their excellent ultraviolet absorption ability and easy availability.

[0004] However, these ultraviolet absorbers are known to irritate the skin of users with sensitive skin. Also, regardless of sensitive skin, when applied to the face, the ultraviolet absorber moves on the skin due to sebum, sweat, etc., and enters the eyes from the corners of the eyes, etc., causing a problem of giving a stinging pain to the eyes.

[0005] Therefore, it is desired to develop a cosmetic having an excellent ultraviolet absorption effect by using an ultraviolet absorber instead of ethylhexyl methoxycinnamate or octocrylene.

[0006] Patent Document 1 discloses a sunscreen composition containing an ultraviolet absorber, diisopropyl sebacate, and at least one oil agent selected from ethylhexyl methoxycinnamate and butyl octyl salicylate. However, there is no disclosure regarding cosmetics containing an alkylene oxide derivative, nor is there any description of the ability to improve the drawback (hereinafter also referred to as "photo-deterioration") that the ultraviolet protection ability decreases upon light irradiation when formulating an ultraviolet absorber with poor photo-stability.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

[0008] The present inventors have surprisingly found that a cosmetic containing an ultraviolet absorber comprising t-butyl methoxydibenzoylmethane, butyl octyl salicylate, and an alkylene oxide derivative can provide an improved ultraviolet protection effect, particularly improved photo-deterioration. The present invention is based on these findings.

[0009] Therefore, the present invention discloses a cosmetic comprising (A) an ultraviolet absorber comprising t-butyl methoxydibenzoylmethane, (B) butyl octyl salicylate, and (C) an alkylene oxide derivative.

[0010] According to the present invention, the following inventions are provided. (1) A cosmetic comprising (A) an ultraviolet absorber comprising t-butyl methoxydibenzoylmethane, (B) butyl octyl salicylate, and (C) an alkylene oxide derivative wherein the cosmetic comprises the above components. (2) The cosmetic according to (1), wherein the (C) alkylene oxide derivative is a compound represented by the following formula (I): [Chemical formula] (In the formula, AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average number of moles of addition of an oxyalkylene group having 3 to 4 carbon atoms and an oxyethylene group, respectively, 1 ≤ p ≤ 70 and 1 ≤ q ≤ 70, and the ratio of the oxyethylene group to the total of the oxyalkylene group and the oxyethylene group is 20 to 80% by mass, the oxyalkylene group and the oxyethylene group may be added in a block form or in a random form, R 1 and R 2 may be the same or different hydrocarbon groups having 1 to 4 carbon atoms or hydrogen atoms, and the ratio of the number of hydrogen atoms to the number of hydrocarbon groups of R 1 and R 2 is 0.15 or less.) (3) The cosmetic according to (2), wherein in the (C) alkylene oxide derivative, the oxyalkylene group and the oxyethylene group are added in a random form. (4) The cosmetic according to any one of (1) to (3), wherein the blending amount of ethylhexyl methoxycinnamate in the cosmetic is 2% by mass or less based on the total amount of the cosmetic. (5) The cosmetic according to any one of (1) to (4), wherein the blending amount of octocrylene in the cosmetic is 2% by mass or less based on the total amount of the cosmetic. (6) The cosmetic according to any one of (1) to (5), which is an oil-based cosmetic. (7) The cosmetic according to any one of (1) to (6), which is an oil-in-water emulsion cosmetic. (8) The cosmetic according to any one of (1) to (7), which is a sunscreen cosmetic.

[0011] By using the cosmetic of the present invention, it is advantageous in that a cosmetic capable of improving the ultraviolet ray protection effect, particularly photo-degradation, can be obtained. Detailed description of the invention

[0012] The present invention relates to A sunscreen agent comprising t-butyl methoxydibenzoylmethane, (B) butyl octyl salicylate, and (C) an alkylene oxide derivative which is a cosmetic.

[0013] (A) Ultraviolet absorber The cosmetic of the present invention contains a sunscreen agent comprising (A) t-butyl methoxydibenzoylmethane. As the sunscreen agent contained in the cosmetic of the present invention, in addition to t-butyl methoxydibenzoylmethane, those usually used in sunscreen cosmetics can be used.

[0014] The sunscreen agents that can be used in addition to t-butyl methoxydibenzoylmethane are not particularly limited, but generally include sunscreen agents commonly used in cosmetics. Specific examples include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and the like.

[0015] Examples of benzoic acid derivatives include ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25-PABA, hexyl diethylaminohydroxybenzoyl benzoate, and the like.

[0016] Examples of salicylic acid derivatives include homosalate, ethylhexyl salicylate (ethylhexyl salicylate), dipropylene glycol salicylate, TEA salicylate, and the like.

[0017] Examples of cinnamic acid derivatives include octyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, di-(2-ethylhexyl)-4'-methoxybenzalmalonate, and the like.

[0018] Examples of dibenzoylmethane derivatives include 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and the like.

[0019] Examples of β,β-diphenylacrylate derivatives include etocrylene, and the like.

[0020] Examples of benzophenone derivatives include benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12, and the like.

[0021] Examples of benzylidene camphor derivatives include 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid, camphor benzalkonium methosulfate, terephthalylidene dicamphor sulfonic acid, polyacrylamide methylbenzylidene camphor, and the like.

[0022] Examples of phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid, disodium phenyl dibenzimidazole tetrasulfonate, and the like.

[0023] Examples of triazine derivatives include bis-ethylhexyl oxy-phenol methoxyphenyl triazine, ethylhexyl triazone, diethylhexyl butamido triazone, 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and the like.

[0024] Examples of phenylbenzotriazole derivatives include droxmetrizole trisiloxane, methylenebis(benzotriazolyltetramethylbutylphenol), and the like.

[0025] Examples of anthranil derivatives include menthyl anthranilate and the like.

[0026] Examples of imidazoline derivatives include ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate and the like.

[0027] Examples of benzalmalonate derivatives include polyorganosiloxanes having a benzalmalonate functional group and the like.

[0028] Examples of 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene and the like.

[0029] The content of the (A) ultraviolet absorber blended in the cosmetic according to the present invention is not particularly limited, but is 5 to 40% by mass, more preferably 6 to 40% by mass, and even more preferably 7 to 30% by mass based on the total amount of the cosmetic. The (A) ultraviolet absorber may be used alone or in combination of two or more.

[0030] The content of t-butylmethoxydibenzoylmethane in the (A) ultraviolet absorber blended in the cosmetic according to the present invention is not particularly limited, but is 0.5 to 5% by mass, more preferably 0.5 to 4% by mass, and even more preferably 1 to 2.5% by mass based on the total amount of the cosmetic.

[0031] According to a preferred embodiment of the cosmetic of the present invention, the blending amount of ethylhexyl methoxycinnamate in the cosmetic of the present invention is 2% by mass or less, more preferably 1% by mass or less, and still more preferably 0.5% by mass or less with respect to the total amount of the cosmetic. Further, the cosmetic of the present invention also includes an embodiment that does not contain or substantially does not contain ethylhexyl methoxycinnamate.

[0032] According to a preferred embodiment of the cosmetic of the present invention, the blending amount of octocrylene in the cosmetic of the present invention is 2% by mass or less, more preferably 1% by mass or less, and still more preferably 0.5% by mass or less with respect to the total amount of the cosmetic. Further, the cosmetic of the present invention also includes an embodiment that does not contain or substantially does not contain octocrylene.

[0033] According to a preferred embodiment of the cosmetic of the present invention, the total blending amount of ethylhexyl methoxycinnamate and octocrylene in the cosmetic of the present invention is 3% by mass or less, more preferably 2% by mass or less, and still more preferably 1% by mass or less with respect to the total amount of the cosmetic.

[0034] (B) Butyl octyl salicylate The cosmetic of the present invention contains (B) butyl octyl salicylate. As the butyl octyl salicylate used in the cosmetic of the present invention, commercially available products such as HALLBRITE BHB (trade name: manufactured by HallStar) can be used.

[0035] The blending amount of (B) butyl octyl salicylate contained in the cosmetic of the present invention is not particularly limited, but is preferably 1 to 10% by mass, more preferably 2 to 8% by mass with respect to the total amount of the cosmetic. By setting the blending amount of butyl octyl salicylate contained in the cosmetic of the present invention to 2 to 8% by mass with respect to the total amount of the cosmetic, the ultraviolet ray protection effect, particularly photo-deterioration, can be further improved.

[0036] (C) Alkylene oxide derivative The cosmetic of the present invention contains (C) an alkylene oxide derivative. The (C) alkylene oxide derivative contained in the cosmetic of the present invention is not particularly limited, but is preferably a compound represented by the following formula (I). [Chemical formula] (In the formula, AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average addition molar numbers of an oxyalkylene group having 3 to 4 carbon atoms and an oxyethylene group, respectively, 1 ≦ p ≦ 70, 1 ≦ q ≦ 70, and the ratio of the oxyethylene group to the total of the oxyalkylene group and the oxyethylene group is 20 to 80% by mass, the oxyalkylene group and the oxyethylene group may be added in a block form or in a random form, R 1 and R 2 are the same or different hydrocarbon groups having 1 to 4 carbon atoms or hydrogen atoms, and the ratio of the number of hydrogen atoms to the number of hydrocarbon groups of R 1 and R 2 is 0.15 or less.)

[0037] In the compound represented by the above formula (I), AO is an oxyalkylene group having 3 to 4 carbon atoms, and examples thereof include an oxypropylene group, an oxybutylene group, an oxyisobutylene group, a trimethylene group, a tetramethylene group, etc., and preferably an oxypropylene group or an oxybutylene group. p is the average addition molar number of an oxyalkylene group having 3 to 4 carbon atoms, 1 ≦ p ≦ 70, preferably 2 ≦ p ≦ 20. q is the average addition molar number of an oxyethylene group, 1 ≦ q ≦ 70, preferably 2 ≦ q ≦ 20. Also, (p + q) is preferably 8 to 100.

[0038] In the compound represented by the above formula (I), the ratio of the oxyethylene group to the total of the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group is preferably 20 to 80% by mass. The order of addition of ethylene oxide and the alkylene oxide having 3 to 4 carbon atoms is not particularly limited. Further, the oxyethylene group and the oxyalkylene group having 3 to 4 carbon atoms may be added in a block form or in a random form, but are preferably added in a random form. Here, the block form includes not only a two-stage block but also a three-stage block.

[0039] R 1 and R 2 may be the same kind, or a hydrocarbon group having 1 to 4 carbon atoms and a hydrogen atom may be mixed, or different hydrocarbon groups having 1 to 4 carbon atoms may be mixed. However, among the hydrocarbon groups of R 1 and R 2 , the ratio of the presence of the hydrocarbon group and the hydrogen atom is such that the ratio Y / X of the number of hydrogen atoms (Y) to the number of hydrocarbon groups (X) is 0.15 or less, preferably 0.06 or less.

[0040] Specific alkylene oxide derivatives include, for example, polyoxyethylene (10 moles) polyoxypropylene (10 moles) dimethyl ether, polyoxyethylene (9 moles) polyoxypropylene (2 moles) dimethyl ether, polyoxyethylene (14 moles) polyoxypropylene (7 moles) dimethyl ether, polyoxyethylene (6 moles) polyoxypropylene (14 moles) dimethyl ether, polyoxyethylene (15 moles) polyoxypropylene (5 moles) dimethyl ether, polyoxyethylene (25 moles) polyoxypropylene (25 moles) dimethyl ether, polyoxyethylene (9 moles) polyoxybutylene (2 moles) dimethyl ether, polyoxyethylene (14 moles) polyoxybutylene (7 moles) dimethyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) diethyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) dipropyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) dibutyl ether, polyoxyethylene (36 moles) polyoxypropylene (41 moles) dimethyl ether, etc. Among these, polyoxyethylene (9 moles) polyoxypropylene (2 moles) dimethyl ether, polyoxyethylene (14 moles) polyoxypropylene (7 moles) dimethyl ether, or polyoxyethylene (36 moles) polyoxypropylene (41 moles) dimethyl ether is preferable, and polyoxyethylene (9 moles) polyoxypropylene (2 moles) dimethyl ether is particularly preferable.

[0041] The alkylene oxide derivative of the present invention can be produced by a known method. For example, it can be obtained by subjecting a compound having a hydroxyl group to addition polymerization of ethylene oxide and an alkylene oxide having 3 to 4 carbon atoms, and then subjecting an alkyl halide to an ether reaction in the presence of an alkali catalyst.

[0042] The blending amount of the (C) alkylene oxide derivative contained in the cosmetic of the present invention is not particularly limited, but is preferably 1 to 15% by mass, more preferably 8 to 12% by mass, based on the total amount of the cosmetic. By setting the blending amount of the alkylene oxide derivative to 1 to 15% by mass based on the total amount of the cosmetic, the ultraviolet ray protection effect, particularly photo-deterioration, can be further improved.

[0043] (D) Ester oil From the viewpoint of improving photo-deterioration, it is preferable that the cosmetic of the present invention contains a (D) ester oil. In the present invention, the (D) ester oil means an ester oil other than butyl octyl salicylate and an ultraviolet absorber. The (D) ester oil contained in the cosmetic of the present invention is not particularly limited, and examples thereof include diethylhexyl succinate, alkyl (C12-15) benzoate, phenethyl benzoate, diisopropyl sebacate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, dibutyl adipate, 2-ethylhexyl palmitate, isopropyl palmitate, isopropyl myristate, isopropyl stearate, isobutyl stearate, 2-ethylhexyl stearate, isopropyl isostearate, butyl isostearate, decyl isostearate, lauryl isostearate, isodecyl isodecanoate, isodecyl isononanoate, isotridecyl isononanoate, isononyl isononanoate, neopentyl glycol dioctanoate, glyceryl tri-2-ethylhexanoate, propylene glycol dicaprate, propylene glycol dicaprate, glycerin tri(capryl·caprate), trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and dipentaerythritol fatty acid ester. Among these, it is preferable to contain diethylhexyl succinate, alkyl (C12-15) benzoate, or diethylhexyl sebacate, and it is more preferable to contain a combination of diethylhexyl succinate and alkyl (C12-15) benzoate.

[0044] The blending amount of the (D) ester oil contained in the cosmetic of the present invention is not particularly limited, but is preferably 5 to 30% by mass, more preferably 5 to 25% by mass, based on the total amount of the cosmetic. When the (D) ester oil contained in the cosmetic of the present invention contains diethylhexyl succinate and / or alkyl benzoate (C12 - 15), the blending amount of diethylhexyl succinate and / or alkyl benzoate (C12 - 15) (the sum of the respective blending amounts when both are included) is preferably 5 to 10% by mass based on the total amount of the cosmetic. Thereby, the ultraviolet ray protection effect, particularly photo - deterioration, can be further improved.

[0045] In addition to the above components, the cosmetic of the present invention may contain, as other optional components, for example, inorganic powders, organic powders, water - soluble polymers, oil - soluble polymers, waxes, alcohols, hydrocarbon oils, fatty acids, higher alcohols, fatty acid esters, silicone oils, surfactants, drugs, and the like.

[0046] The inorganic powder that may be contained in the cosmetic of the present invention is not particularly limited as long as it is a powder used in the field of cosmetics. Specific examples include one or more selected from titanium oxide, zinc oxide, cerium oxide, barium sulfate, iron oxide, talc, mica, sericite, kaolin, mica titanium, ultramarine, chromium oxide, chromium hydroxide, silica, and the like.

[0047] As the ultraviolet ray scattering agent, in particular, it is preferable to use a powder having a refractive index of 1.5 or more, such as zinc oxide, titanium oxide, and cerium oxide, from the viewpoint of optical properties.

[0048] Since the ultraviolet scattering agent improves its dispersibility in oil and water resistance by surface hydrophobization treatment, a surface-hydrophobized ultraviolet scattering agent may preferably be included. Examples of the surface treatment method include silicone treatment with methylhydrogenpolysiloxane, methylpolysiloxane, etc.; alkylsilane treatment; fluorine treatment with perfluoroalkyl phosphate ester, perfluoroalcohol, etc.; amino acid treatment with N-acylglutamic acid, etc.; and other treatments such as lecithin treatment, metal soap treatment, fatty acid treatment, alkyl phosphate ester treatment, etc.

[0049] The ultraviolet scattering agent that may be contained in the cosmetic of the present invention is not particularly limited, but usually, those having an average primary particle diameter of 100 nm or less are preferable, and more preferably 80 nm or less. When the average primary particle diameter greatly exceeds 100 nm, it tends to cause whitening or white residue. The average primary particle diameter in the present invention is a value obtained as the arithmetic mean of the major axis and the minor axis of the particles from, for example, a transmission electron micrograph.

[0050] The particle shape of the ultraviolet scattering agent is not particularly limited, and it may be in the state of primary particles or may form aggregated secondary aggregates. Also, the distinction in shape such as spherical, elliptical, crushed, etc. is not particularly limited.

[0051] Examples of the water-soluble polymer that may be contained in the cosmetic of the present invention include homopolymers or copolymers of 2-acrylamido-2-methylpropanesulfonic acid (hereinafter abbreviated as "AMPS"). The copolymer is a copolymer composed of comonomers such as vinylpyrrolidone, acrylamide, sodium acrylate, hydroxyethyl acrylate, etc. That is, AMPS homopolymer, vinylpyrrolidone / AMPS copolymer, dimethylacrylamide / AMPS copolymer, acrylamide / AMPS copolymer, sodium acrylate / AMPS copolymer, etc. are exemplified.

[0052] Furthermore, examples include carboxyvinyl polymer, ammonium polyacrylate, sodium polyacrylate, sodium acrylate / alkyl acrylate / sodium methacrylate / alkyl methacrylate copolymer, carrageenan, pectin, mannan, curdlan, chondroitin sulfate, starch, glycogen, gum arabic, sodium hyaluronate, tragacanth gum, xanthan gum, mucitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, guar gum, dextran, keratosulfate, locust bean gum, succinoglucan, chitin, chitosan, carboxymethyl chitin, agar, and the like.

[0053] Examples of the oil-soluble polymer include trimethylsiloxysilicic acid, alkyl-modified silicone, polyamide-modified silicone, dimethicone cross polymer, (dimethicone / vinyl dimethicone) cross polymer, polymethylsilsesquioxane, and the like.

[0054] Examples of the waxes include, for example, beeswax, candelilla wax, carnauba wax, jojoba wax, and the like.

[0055] Examples of the alcohols include lower alcohols such as ethanol and isopropanol, and polyhydric alcohols such as ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, and polybutylene glycol.

[0056] Examples of the hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, and the like.

[0057] Examples of the fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, arachidonic acid, and the like.

[0058] Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, arachyl alcohol, batyl alcohol, chimyl alcohol, carnallol, serinol, coriolic alcohol, myricyl alcohol, laceryl alcohol, elaidyl alcohol, isostearyl glyceryl ether, octyl alcohol, triacontyl alcohol, ceracyl alcohol, cetostearyl alcohol, oleyl alcohol, lanolin alcohol, hydrogenated lanolin alcohol, isostearyl alcohol, hexyl decanol, octyl decanol, and the like.

[0059] Examples of silicone oils include methylpolysiloxane, octamethylsiloxane, decamethyltetrasiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and the like. Preferably, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and the like are exemplified.

[0060] Surfactants include anionic, cationic, nonionic, or amphoteric surfactants, and include silicone-based or hydrocarbon-based surfactants.

[0061] Examples of powder components other than the ultraviolet scattering agent include nylon and acrylic polymer spherical powders, silica powder, silicone powder, metal oxide powders surface-treated with a metal-free surface treatment agent, and the like.

[0062] Examples of drugs include salts of L-ascorbic acid and its derivatives, glycyrrhizic acid and its derivatives such as dipotassium glycyrrhizinate and monoammonium glycyrrhizinate, glycyrrhetinic acid and its derivatives such as stearyl glycyrrhetinate, allantoin, tranexamic acid and its derivative salts, alkoxysalicylic acid and its derivative salts, glutathione and its derivative salts, allantoin, azulene, and the like.

[0063] According to one preferred embodiment of the cosmetic of the present invention, it is an oil-based cosmetic. Here, the oil-based cosmetic means a single-phase oil system (anhydrous) or an oil-in-water type cosmetic.

[0064] According to a more preferred embodiment of the cosmetic of the present invention, it is an oil-in-water type emulsified cosmetic.

[0065] According to another preferred embodiment of the cosmetic of the present invention, it is a sunscreen cosmetic, and the sunscreen cosmetic may be an oil-based cosmetic or an oil-in-water type emulsified cosmetic. Specific dosage forms include dosage forms such as sunscreen lotions and sunscreen creams, and they can be manufactured using conventional methods suitable for each dosage form.

Examples

[0066] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are shown in mass%.

[0067] Cosmetics (Examples 1 to 6 and Comparative Examples 1 to 6) having the compositions shown in Tables 1 and 2 below were prepared by a conventional method, and the residual rate (%) was calculated based on the following method. Also, the calculated residual rate (%) is shown in Tables 1 and 2.

[0068] (1) Calculation of residual rate For each cosmetic (Examples 1 to 6 and Comparative Examples 1 to 6), the photo-stability (stability of ultraviolet absorption ability) of the sunscreen cosmetic was evaluated by the following method. For each sample, the sample was applied to a PMMA substrate, and the absorbance at 500 - 280 nm was measured. The substrate was irradiated with UV at an ultraviolet dose of 16 MED (Minimal Erythema dose) (minimum erythema dose) / min / cm 2 of the SPF measuring device "SPF MASTER" (registered trademark) (Shiseido), and then the absorbance was measured in the same manner. The change in the integrated absorbance value in the wavelength region before and after irradiation (residual rate of ultraviolet absorption ability after light irradiation) (in vitro) was calculated according to the following formula. Residual rate after light irradiation (%) = (Integrated absorbance value after light irradiation) / (Integrated absorbance value before light irradiation) × 100

[0069] In addition, based on the following evaluation criteria, the evaluations of "A" to "D" were given in Tables 1 and 2 below. <Evaluation criteria> A: The residual rate is 90% or more. B: The residual rate is 85% or more and less than 90%. C: The residual rate is 80% or more and less than 85%. D: The residual rate is less than 80%.

[0070]

Table 1

[0071]

Table 2

[0072] From the results of Tables 1 and 2, the cosmetics (Examples 1 to 6) included in the scope of the present invention showed high residual rates with the evaluation results of "A" or "B" for the residual rate. On the other hand, the cosmetics (Comparative Examples 1 to 6) not included in the scope of the present invention showed low residual rates with the evaluation results of "C" or "D" for the residual rate. Therefore, it was found that the cosmetics of the present invention can improve the ultraviolet protection effect, particularly photo-degradation.

[0073] Formulation Example 1: Sunscreen Examples of the sunscreen included in the scope of the cosmetics of the present invention are shown below as Formulation Example 1.

Table 3

Claims

1. An ultraviolet absorber comprising (A) t-butylmethoxydibenzoylmethane, (B) butyl octyl salicylate, and (C) an alkylene oxide derivative and wherein component (C) comprises polyoxyethylene (10 moles) polyoxypropylene (10 moles) dimethyl ether, polyoxyethylene (9 moles) polyoxypropylene (2 moles) dimethyl ether, polyoxyethylene (14 moles) polyoxypropylene (7 moles) dimethyl ether, polyoxyethylene (6 moles) polyoxypropylene (14 moles) dimethyl ether, polyoxyethylene (15 moles) polyoxypropylene (5 moles) dimethyl ether, polyoxyethylene (25 moles) polyoxypropylene (25 moles) dimethyl ether, polyoxyethylene (9 moles) polyoxybutylene (2 moles) dimethyl ether, polyoxyethylene (14 moles) polyoxybutylene (7 moles) dimethyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) diethyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) dipropyl ether, polyoxyethylene (10 moles) polyoxypropylene (10 moles) dibutyl ether, or polyoxyethylene (36 moles) polyoxypropylene (41 moles) dimethyl ether, the content of t-butylmethoxydibenzoylmethane in component (A) is 0.5 to 5% by mass based on the total amount of the cosmetic, the content of component (B) is 1 to 10% by mass based on the total amount of the cosmetic, and the content of component (C) is 1 to 15% by mass based on the total amount of the cosmetic. A cosmetic.

2. Further comprising (D) an ester oil, wherein component (D) comprises diethylhexyl succinate, alkyl benzoate (C12-15), or diethylhexyl sebacate. The cosmetic according to claim 1.

3. The cosmetic according to claim 1 or 2, wherein the content of ethylhexyl methoxycinnamate in the cosmetic is 2% by mass or less based on the total amount of the cosmetic.

4. The cosmetic according to any one of claims 1 to 3, wherein the content of octocrylene in the cosmetic is 2% by mass or less based on the total amount of the cosmetic.

5. The cosmetic according to any one of claims 1 to 4, which is an oily cosmetic.

6. The cosmetic according to any one of claims 1 to 5, which is an oil-in-water emulsified cosmetic.

7. The sunscreen cosmetic according to any one of claims 1 to 6.

Images