Two-layer sunscreen cosmetics

Abstract

To provide two-layer type sunscreen cosmetics that have good stability even when mixed with powder, can be easily re-dispersed, are not sticky, and can be atomized, by making the upper layer an aqueous layer and the lower layer an emulsified layer containing powder.SOLUTION: Provided is a two-layer type sunscreen cosmetic containing (A) to (D): (A) an organic UV absorber; (B) a volatile silicone oil; (C) lipophilic powder with an average particle size of 5.0 to 20 μm; and (D) polyvinylpyrrolidone.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a two-layer sunscreen cosmetic. [Background technology]

[0002] BACKGROUND ART In order to protect the skin from the adverse effects of ultraviolet rays, sunscreen cosmetics containing various ultraviolet absorbers have been developed. In particular, Patent Document 1 describes an oil-in-water type UV protective cosmetic composition containing an organic UV absorber, silicone oil, and an acrylic acid-based water-soluble polymer.

[0003] Furthermore, the ability to spray as a mist is useful in terms of ease of application, and emulsion compositions that can be sprayed as a mist have also been proposed (Patent Document 2). Furthermore, since reapplication is often required to maintain the UV absorption effect, the ability to spray as a mist is convenient for carrying around and reapplication, and consumer needs are increasing. As such an emulsion composition that can be sprayed as a mist and has a high UV absorption effect, an emulsion composition containing an oil-soluble UV absorber, an acrylic acid-based water-soluble polymer thickener, and a nonionic surfactant has been proposed (Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-89834 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-151901 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-199689 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the emulsion composition described in Patent Document 3 has an upper emulsion layer and a lower aqueous layer, which means that when powder is blended in, caking is likely to occur, posing problems with the redispersibility of the powder. Therefore, the objective of the present invention is to provide a two-layer sunscreen cosmetic that has an upper aqueous layer and a lower emulsion layer containing powder, which can be easily redispersed even when powder is blended in, is non-sticky, and can be sprayed in a mist. [Means for solving the problem]

[0006] A two-layer sunscreen cosmetic comprising (A) to (D). (A) Organic UV absorber (B) Volatile silicone oil (C) Lipophilic powder with an average particle size of 5.0 to 20 μm (D) Polyvinylpyrrolidone [Effects of the Invention]

[0007] The two-layer sunscreen cosmetic of the present invention has an upper layer that is an aqueous layer and a lower layer that is an emulsion layer containing powder, and thereby exhibits the effects that even if powder is incorporated, it can be easily redispersed, is non-sticky, and can be sprayed in a mist. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described.

[0009] The two-layer sunscreen cosmetic of the present invention contains the following (A) to (D) as essential components. (A) Organic UV absorber (B) Volatile silicone oil (C) Lipophilic powder with an average particle size of 5.0 to 20 μm (D) Polyvinylpyrrolidone

[0010] The two-layer sunscreen cosmetic of the present invention has an appearance in which the emulsion layer containing the powder is separated into a lower layer and an aqueous layer containing the aqueous component is separated into an upper layer.

[0011] Although the two-layer sunscreen cosmetic of the present invention is separated, it can be easily mixed uniformly at the time of use.

[0012] The two-layer sunscreen cosmetic of the present invention can be sprayed in the form of a mist using a dispenser, etc. In the present invention, the term "sprayable in the form of a mist" does not apply to aerosols.

[0013] The organic UV absorber (A) of the present invention is not particularly limited as long as it can be incorporated into cosmetics, but is preferably an oil-soluble UV absorber. Examples of such UV absorbers include cinnamic acid derivatives such as octyl paramethoxycinnamate, isopropyl methoxycinnamate, and isoamyl methoxycinnamate; PABA derivatives such as para-aminobenzoic acid (hereinafter abbreviated as "PABA"), ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, and glyceryl PABA; salicylic acid derivatives such as homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate; benzophenone-1, benzophenone-2, and benzyl salicylate. Benzophenone derivatives such as benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, and benzophenone-12; benzylidene camphor derivatives such as 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, benzalkonium camphor methosulfate, terephthalidene discamphorsulfonic acid, and polyacrylamidomethyl benzylidene camphor; anisotriazine, diethylhexyl triazine derivatives such as 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, 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; phenylbenzimidazole derivatives such as phenyldibenzimidazole tetrasulfonic acid disodium salt; drometrizone Phenylbenzotriazole derivatives such as phenyltrisiloxane and methylenebis(benzotriazolyltetramethylbutylphenol); anthranil derivatives such as menthyl anthranilate; imidazoline derivatives such as 2-ethylhexyl dimethoxybenzylideneoxoimidazolidinepropionate; benzalmalonate derivatives such as polyorganosiloxanes having benzalmalonate functional groups; 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene;Examples of such organic UV absorbers include octocrylene, 2-[4-(diethylamino)-2-hydroxybenzoyl]hexyl benzoate, and 4-tert-butyl-4'-methoxydibenzoylmethane. These organic UV absorbers can be used singly or in combination of two or more. In the present invention, it is most preferable to use octyl paramethoxycinnamate from the viewpoints of UV absorption ability and safety to the skin.

[0014] The blending amount of the organic UV absorber is preferably 1 to 20% by mass. If it is less than 1% by mass, sufficient sunscreen effect cannot be obtained, and if it exceeds 20% by mass, it may have a negative effect on the feeling of use, such as stickiness or increased primary irritation to the skin.

[0015] Examples of the volatile silicone oil (B) of the present invention include linear dimethylpolysiloxanes such as hexamethyldisiloxane, octamethyltrisiloxane, dimethylpolysiloxane (1cs), dimethylpolysiloxane (1.5cs), and dimethylpolysiloxane (2cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. These volatile silicone oils can be used alone or in combination of two or more. Among these, dimethylpolysiloxane (1.5cs) and cyclopentasiloxane are particularly suitable.

[0016] The blending amount of component (B) in the two-layer sunscreen cosmetic of the present invention is preferably 0.1 to 20 mass% or less, more preferably 0.5 to 9.0 mass%, and particularly preferably 2 to 7 mass%. If the blending amount exceeds 20 mass%, a two-layer cosmetic may not be obtained.

[0017] The lipophilic powder (C) having an average particle size of 5.0 to 20 μm of the present invention is not particularly limited as long as it is a powder that can be incorporated into cosmetics. The average particle size referred to in the present invention is a volume-based average particle size, which can be measured using a laser diffraction / scattering particle size distribution analyzer. The average particle size is a value measured using a laser diffraction / scattering particle size distribution analyzer.

[0018] Specifically, one or more selected from hydrophobic-treated talc and spherical cellulose are preferred, and it is most preferred to use hydrophobic-treated talc and spherical cellulose in combination. The hydrophobic treatment method for hydrophobic-treated talc is not particularly limited, and examples include dimethicone treatment, silane treatment, metal soap treatment, higher fatty acid treatment, acylamino acid treatment, etc. Among these hydrophobic treatments, acylamino acid treatment is preferred, and lauroyl lysine treatment is most preferred.

[0019] The blending amount of component (C) in the two-layer sunscreen cosmetic of the present invention is preferably 0.1 to 10% by mass, more preferably 0.5 to 8.0% by mass, and particularly preferably 1 to 5% by mass. If the blending amount exceeds 10% by mass, a two-layer cosmetic may not be obtained.

[0020] The two-layer sunscreen cosmetic of the present invention can use an emulsifier. As such an emulsifier, any of nonionic surfactants, anionic surfactants, and amphoteric surfactants can be used, but the use of a nonionic surfactant is preferred.

[0021] The two-layer sunscreen cosmetic of the present invention may contain a water-soluble polymer other than polyvinylpyrrolidone. Examples include gum arabic, gum tragacanth, gum karaya, xanthan gum, tamarind gum, guar gum, hydroxypropyl guar gum, locust bean gum, quince seed gum, gellan gum, native gellan gum, polyacrylic acid, polymethacrylic acid, polyvinyl alcohol, polyethylene glycol, polyvinylpyrrolidone, polyacrylamide, polymethacrylamide, methacryloyloxyethyltrimethylammonium chloride, methacrylamidopropyltrimethylammonium chloride, Nn-butoxymethylacrylamide, N-iso-butoxyacrylamide, tert-butylacrylamidosulfonic acid, dimethylaminopropylmethacrylamide, copolymers of these polymerizable monomers with other polymerizable monomers, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, alginic acid, pullulan, carrageenan, hyaluronic acid, chondroitin sulfate, dermatan sulfate, collagen, chitin derivatives, pectin, gelatin, carboxyvinyl polymers, acrylic acid-alkyl methacrylate copolymers, and salts thereof. These can be used alone or in combination of two or more.

[0022] In addition to the essential and optional ingredients described above, the two-layer sunscreen cosmetic of the present invention may contain, as needed, aqueous components, oily components, moisturizers, pigments, surfactants, thickeners, cosmetic ingredients, fragrances, polymeric substances, antibacterial and antifungal agents, alcohols, powders, biologically derived components, and the like, which are typically contained in two-layer sunscreen cosmetics.

[0023] The two-layer sunscreen cosmetic of the present invention can be produced by a conventional production method. [Example]

[0024] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited thereto. The blending amounts are in mass % unless otherwise specified.

[0025] First, the evaluation methods for the examples of the present invention and the comparative examples will be described. [Fog quality] The two-layer sunscreen cosmetic was filled into a mist container, and the state of the sprayed mist was evaluated by a panel of three experts, who then unanimously rated it according to the following criteria. <Evaluation criteria> ◎: Very good fog conditions ○: Good fog conditions △: The fog condition is not good. ×: The fog conditions are very poor [2 layer separation] The condition of the two-layer sunscreen cosmetics 24 hours after preparation was evaluated by three expert panelists, and the evaluation was conducted by consensus according to the following criteria. <Evaluation criteria> ◎: Powder settles together with the emulsion layer 〇: Emulsified layer is dispersed throughout △: Powder floats to the top with the cream layer ×: The cream layer is on top, and only the powder settles and forms a cake. [Redispersibility] The redispersibility of the two-layer sunscreen cosmetic composition 24 hours after preparation was evaluated by a panel of three experts, and the evaluation was conducted by consensus according to the following criteria. <Evaluation criteria> ◎: Very good redispersibility ○: Good redispersibility △: Poor redispersibility ×: Redispersibility is very poor

[0026] Using the formulations shown in Table 1, two-layer sunscreen cosmetics according to Examples 1 to 4 and Comparative Examples 1 to 3 were prepared and evaluated by standard methods. As a result, the Examples, which contained a volatile silicone oil, which is a silicone polymer of the present invention, were superior in mist quality and two-layer separation to the Comparative Examples.

[0027] [Table 1]

[0028] Using the formulations shown in Table 2, two-layer sunscreen cosmetics according to Examples 1, 5, and 6 and Comparative Examples 4 and 5 were prepared and evaluated by standard methods. As a result, the Examples, which contained lipophilic powder of the present invention with an average particle size of 5.0 to 20 μm, were superior in two-layer separation and redispersibility to the Comparative Examples.

[0029] [Table 2]

[0030] Using the formulations shown in Table 3, two-layer sunscreen cosmetics according to Examples 1, 7 to 9 and Comparative Examples 6 to 10 were prepared and evaluated by standard methods. As a result, the Examples containing polyvinylpyrrolidone of the present invention were superior in mist quality and two-layer separation to the Comparative Examples.

[0031] [Table 3]

Claims

[Claim 1] A two-layer sunscreen cosmetic comprising (A) to (D). (A) Organic UV absorber (B) 0.1 to 20% by mass of one or more selected from hexamethyldisiloxane, octamethyltrisiloxane, dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), dimethylpolysiloxane (2 cs), methyltrimethicone, tris(trimethylsilyl)methylsilane, tetrakis(trimethylsilyl)silane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. (C) 0.1 to 10% by mass of one or two selected from lauroyl lysine-treated talc and spherical cellulose having an average particle size of 5.0 to 20 μm (D) 1 to 3% by mass of polyvinylpyrrolidone

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