Oily solid cosmetic

Abstract

To provide a sunscreen oily solid cosmetic excellent in water resistance.SOLUTION: This oily solid cosmetic comprises (A) a gelling agent, (B) a silicone-based surfactant functioning as a water resistance-improving agent and (C) an ultraviolet light-scattering agent. Here, the ratio B / C of the content of component (B) to the content of component (C) contained in the oily solid cosmetic is 0.01 to 0.5.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oily solid cosmetic preparation. [Background technology]

[0002] Various sunscreen compositions have been developed to minimize the adverse effects of ultraviolet rays on the skin. Generally, sunscreen compositions contain ultraviolet absorbers and ultraviolet scattering agents that block UVA and UVB rays from reaching the skin, thereby achieving ultraviolet protection. Such sunscreen compositions contain an ultraviolet absorbing agent or an ultraviolet scattering agent, and conventionally, emulsion compositions containing an ultraviolet absorbing agent or an ultraviolet scattering agent have generally been used. On the other hand, sunscreen compositions are often used under conditions where sweating or exposure to water is likely. Even when the composition is wetted by sweat or water, it is required that the composition applied to the skin does not come off and maintains its UV protection function. Furthermore, in order to suppress skin irritation, there is a demand for non-chemical sunscreen compositions that do not contain UV absorbers but instead rely on UV scattering agents to achieve sufficient sunscreen effects. While lotion-type and cream-type sunscreen compositions have been widely used up to now, stick-type sunscreen compositions have also been developed that do not stain hands during application and have high water resistance after application. However, there has been a demand for non-chemical sunscreen cosmetics with further improved water resistance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-52155 Summary of the Invention

[0004] According to the present invention, the following inventions are provided. [1] (A) a gelling agent, (B) a silicone surfactant, and (C) UV scattering agent An oily solid cosmetic comprising: An oily solid cosmetic, wherein the ratio B / C of the content of component (B) to the content of component (C) contained in said oily solid cosmetic is 0.01 to 0.5. [2] of the total mass of the oily solid cosmetic The content of component (A) is 3 to 30 mass %, The content of component (B) is 0.2 to 20 mass %, The content of component (C) is 5 to 40 mass%. [1] An oily solid cosmetic preparation according to the present invention. [3] The oily solid cosmetic preparation according to [1] or [2], wherein component (A) is selected from the group consisting of solid waxes and oil gelling agents. [4] The oily solid cosmetic preparation according to any one of [1] to [3], wherein component (A) is a solid wax. [5] The oil-based solid cosmetic preparation according to any one of [1] to [4], wherein component (A) is a solid wax having a melting point of 50°C or higher at normal pressure. [6] The oily solid cosmetic preparation according to any one of [1] to [5], wherein component (B) is a main chain having a polysiloxane structure to which a polyoxyalkylene chain is bonded. [7] The oily solid cosmetic preparation according to any one of [1] to [6], wherein the HLB value of component (B) is 0.1 to 18. [8] The oily solid cosmetic preparation according to any one of [1] to [7], wherein component (C) is a fine particle metal oxide. [9] The oily solid cosmetic preparation according to any one of [1] to [8], wherein the surface of component (C) has been subjected to a hydrophobic treatment.

[10] The oily solid cosmetic according to any one of [1] to [9], wherein the content of water contained in the oily solid cosmetic is 2% by mass or less based on the total mass of the oily solid cosmetic.

[11] (D) The oily solid cosmetic preparation according to any one of [1] to

[10] , further comprising an oil component.

[12] The oily solid cosmetic according to any one of [1] to

[11] , which is a non-emulsified oily solid cosmetic.

[13] The oily solid cosmetic preparation according to any one of [1] to

[12] , wherein the hardness is 20 to 300 mN as measured by a rheometer at 37°C with a pressure-sensitive shaft of 1.5φ, a penetration speed of 2 cm / min, a penetration depth of 10 mm.

[14] A method for producing an oily solid cosmetic, comprising blending a silicone surfactant into the oily solid cosmetic as a water resistance improver.

[15] An oily solid cosmetic comprising a silicone surfactant as a water resistance improver.

[0005] According to the present invention, an oily solid cosmetic composition is provided which has excellent water resistance when applied to the skin and has a high sunscreen effect.

[0006] The oily solid cosmetic composition according to the present invention (hereinafter simply referred to as "cosmetic composition") has the following properties: (A) a gelling agent, (B) a silicone surfactant, and (C) UV scattering agent Each of these components, as well as other components that may be added, will be described below.

[0007] <(A) Gelling agent> The cosmetic preparation according to the present invention contains a gelling agent (hereinafter sometimes referred to as component (A)). The gelling agent has the effect of gelling and solidifying the composition. Examples of such gelling agents include solid waxes and oil gelling agents.

[0008] The solid wax is not particularly limited as long as it is one that is normally used in cosmetics, and examples thereof include synthetic waxes such as paraffin wax, microcrystalline wax, polyethylene wax, and Fischer-Tropsch wax, and natural waxes such as carnauba wax, candelilla wax, eco-soy wax, rice wax, beeswax, Japan wax, ozokerite, and ceresin, which are solid at normal pressure, particularly those with a melting point of 50°C or higher, but are not limited to these examples.

[0009] Examples of the oil gelling agent include condensates of benzaldehydes such as dibenzylidene sorbitol, tribenzylidene sorbitol, dibenzylidene xylitol, and paramethoxybenzylidene sorbitol with pentavalent or higher alcohols; metal soaps such as calcium stearate, calcium palmitate, lithium 2-ethylhexanoate, and aluminum 12-hydroxystearate; amide, ester, and amine salt derivatives of N-acylamino acids such as lauroyl glutamic acid dibutylamide, lauroyl glutamic acid stearylamide, dicaproyl lysine laurylamine salt, dicaproyl lysine lauryl ester, and dicaproyl lysine lauroyl phenylalanine laurylamide; dextrin fatty acid esters composed of acid hydrolysates of starch saturated fatty acid esters having an ester group substitution degree of 30% or more; and oligomers obtained by condensing 12-hydroxystearic acid, glycerin, and a mixed fatty acid composed of behenic acid and eicosanedioic acid. The above gelling agents can be used alone or in combination of two or more kinds. Among these, solid waxes are preferably used.

[0010] <(B) Silicone surfactant> The cosmetic composition according to the present invention contains a silicone surfactant (hereinafter sometimes referred to as component (B)). The silicone surfactant has a polysiloxane structure in the main chain, and is not particularly limited, but is preferably modified with, for example, a polyether group or a polyglycerin group. Preferably, the silicone surfactant has an oxyalkylene chain.

[0011] Various silicone surfactants modified with polyether groups are known, and any surfactant suitable for use in cosmetics can be selected for use. The molecular weight of such surfactants is not necessarily limited, but those with a mass-average molecular weight of 30,000 or more are preferably used.

[0012] Examples of polyether-modified silicones modified with polyether groups include: Poly(oxyethylene-oxypropylene) methylpolysiloxane copolymer, Polyoxyethylene methylpolysiloxane copolymer, silicone chain branched methylpolysiloxane copolymer, Alkyl chain branched polyoxyethylene methylpolysiloxane copolymer, Alkyl- and silicone-chain branched polyoxyethylenemethylpolysiloxane copolymer, Crosslinked polyoxyethylene methylpolysiloxane, Alkyl-containing cross-linked polyoxyethylene methylpolysiloxane etc. can also be used.

[0013] Furthermore, examples of polyglycerin-modified silicones modified with polyglycerin groups include: Branched polyglycerin-modified silicone, Cross-linked polyglycerin-modified silicone, alkyl group-containing cross-linked polyglycerin-modified silicone, Alkyl-branched polyglycerin-modified silicone etc. can also be used.

[0014] As a more specific example, PEG-9 Polydimethylsiloxyethyl Dimethicone, Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone, Cetyl PEG / PPG-10 / 1 Dimethicone, PEG-9 methyl ether dimethicone, PEG-10 Dimethicone, PEG-3 Dimethicone, PEG / PPG-19 / 19 Dimethicone, PEG / PPG-18 / 18 Dimethicone These include, but are not limited to:

[0015] The HLB value of component (B) can be selected arbitrarily depending on the purpose, but is preferably 0.1 to 18, and more preferably 1 to 15. Here, the HLB value can be determined by the Griffin method.

[0016] Such silicone surfactants significantly improve the water resistance of the cosmetics according to the present invention. Surfactants are generally used to improve the dispersibility and dispersion stability of emulsion-type cosmetics. Therefore, it is difficult to obtain effects such as improved dispersibility in oil-based solid cosmetics that do not have an aqueous phase. However, it was unexpected that the water resistance of such oil-based cosmetics can be improved by combining a silicone surfactant, particularly the specific silicone surfactant described above, with such oil-based cosmetics.

[0017] Therefore, in the present invention, the silicone surfactant is blended as a water resistance improver, and the present invention also encompasses a method for producing an oily solid cosmetic or a method for improving water resistance, in which a silicone surfactant is blended as a water resistance improver in an oily solid cosmetic.

[0018] Here, component (B) functions as a water resistance improver rather than as a surfactant as described above, but since what is generally called a silicone surfactant is used, for convenience, component (B) will be referred to as a surfactant.

[0019] <(C) UV scattering agent> The cosmetic preparation according to the present invention contains an ultraviolet scattering agent (hereinafter sometimes referred to as component (C)). Component (C) can be selected from ultraviolet scattering agents commonly used in suncare cosmetics. Specific examples include fine particle metal oxides such as zinc oxide, titanium oxide, iron oxide, cerium oxide, and tungsten oxide.

[0020] Component (C) may be untreated or may have been subjected to various hydrophobic surface treatments, but from the viewpoint of cosmetic stability, it is preferable to use a hydrophobic-treated component. Surface treatment agents used for the hydrophobic treatment include those commonly used in the cosmetic field, such as dimethicone, silicones such as alkyl-modified silicones, alkoxysilanes such as octyltriethoxysilane, dextrin fatty acid esters such as dextrin palmitate, and fatty acids such as stearic acid.

[0021] The average primary particle size of component (C) is not particularly limited, but is generally 10 nm to 100 nm, preferably 10 nm to 50 nm. Here, the average primary particle size in this specification means the diameter of the primary particles of the powder measured by a commonly used method, and specifically, is the value determined as the arithmetic mean of the lengths of the major and minor axes of the particles from a transmission electron microscope photograph. The particle shape of component (C) is not particularly limited, but may be, for example, spherical, elliptical, or crushed.

[0022] The cosmetic preparation according to the present invention comprises the above-mentioned components (A) to (C) as essential components. The content of each component can be adjusted depending on the purpose. For example, the content of each component can be adjusted based on the total mass of the oily solid cosmetic preparation. The content of component (A) is preferably 3 to 30 mass%, more preferably 5 to 20 mass%, The content of the (B) component is preferably 0.2 to 20 mass%, more preferably 0.5 to 10 mass%, The content of component (C) is preferably 5 to 40 mass %, more preferably 10 to 30 mass %.

[0023] Furthermore, the blending ratio of component (B) to component (C) is important in the cosmetic composition of the present invention. Specifically, the ratio B / C of the content of component (B) to the content of component (C) must be 0.01 to 0.5, and preferably 0.03 to 0.3. If B / C is outside this range, the water resistance improving effect tends to be significantly inferior.

[0024] <Other ingredients> The cosmetic preparation according to the present invention may contain other components in addition to the above-mentioned components (A) to (C), as necessary. One such component may be an oil (hereinafter sometimes referred to as component (D)). Component (D) is a component commonly used in cosmetics. Among such oils, oils that are liquid at room temperature (25°C) are preferably used in the present invention.

[0025] Such component (D) includes: Neopentyl glycol dicaprate, diisostearyl malate, pentaerythrityl tetraethylhexanoate, di(phytosteryl / octyldodecyl) lauroyl glutamate, triisostearin, glyceryl diisostearate, tri(caprylic / capric)glyceryl, polyglyceryl-6 polyricinoleate, triethylhexanoin, phytosteryl / behenyl dimer dilinoleate, phytosteryl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate, isopropyl palmitate, triisostearin, ethylhexyl palmitate, myristyl myristate, isopropyl myristate, tripropylene glycol dipivalate, ester oils such as diisopropyl sebacate, isodecyl neopentanoate, isocetyl isostearate, cetyl 2-ethylhexanoate, 2-heptylundecyl palmitate, diisobutyl adipate, 2-hexyldecyl sebacate, isopropyl myristate, 2-octyldodecyl oleate, neopentyl glycol diheptanoate, ethylene glycol di-2-ethylhexanoate, glyceride tri-2-heptylundecanoate, glyceryl diisostearate, glyceryl triisostearate, glycerin trioctanoate, glycerin triisopalmitate, trimethylolpropane tri-2-ethylhexanoate, or pentaerythritol tetra-2-ethylhexanoate; hydrocarbon oils such as squalane; Chain silicone oils such as dimethicone, dimethylpolysiloxane, or methylphenylpolysiloxane (diphenylsiloxyphenyltrimethicone); cyclic silicone oils such as octamethylcyclotetrasiloxane or decamethylcyclopentasiloxane; Higher alcohols, fatty acids, triglycerides, and fluorine-modified oils etc.

[0026] When the cosmetic of the present invention contains component (D), its content can be adjusted as desired depending on the purpose, but the content of component (D) based on the total mass of the cosmetic is preferably 80 mass% or less, and more preferably 70 mass% or less. Note that component (D) according to the present invention does not include the aforementioned component (A) or the ultraviolet absorber described below.

[0027] The cosmetic composition of the present invention achieves ultraviolet protection through the aforementioned component (C), but to further enhance this effect, it can also be combined with an ultraviolet absorber. Examples of ultraviolet absorbers 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 silicone derivatives.

[0028] However, since the ultraviolet absorber may cause stickiness when applied, the content thereof is preferably low, and it is preferable that the ultraviolet absorber is not contained at all.

[0029] The cosmetic according to the present invention may also contain water. Water may be incorporated as a solvent in various raw materials. However, it is preferable that the cosmetic of the present invention has a low water content in order to maintain its solid form. Specifically, the water content in the cosmetic is preferably 2% by mass or less, based on the total mass of the cosmetic, and more preferably, no water is contained. The cosmetic according to the present invention is preferably an oil-based solid cosmetic with a low water content and is preferably a non-emulsified solid cosmetic. Because of its low water content, component (B) is thought to hardly exhibit the usual surfactant functions, such as improving dispersion stability. However, in the present invention, component (B) functions as a water resistance improver during application in non-emulsified solid cosmetic compositions.

[0030] The cosmetic composition according to the present invention may contain other optional components as needed. Such components include, for example, (a) Surfactants (other than component (B), such as anionic surfactants, nonionic surfactants, cationic surfactants, and benign surfactants) (b) humectants (e.g., 1,3-butylene glycol, propylene glycol, dipropylene glycol, glycerin, diglycerin, etc.); (c) Powder components (other than component (C) such as inorganic powders, organic powders, pigments, etc.); (d) lipophilic thickeners; (e) lower alcohols (alcohols with less than six carbon atoms); (f) antioxidants (e.g., tocopherols, dibutylhydroxytoluene (BHT), etc.); (g) preservatives (e.g., methylparaben, phenoxyethanol); (h) anti-inflammatory agents (e.g., glycyrrhizinic acid derivatives, glycyrrhetinic acid derivatives, etc.); (i) Skin whitening agents (e.g., saxifrage extract, arbutin, tranexamic acid, etc.); (j) various extracts; Enhancers (e.g., royal jelly, etc.); (k) blood circulation promoters (e.g., nonylic acid valenylamide, nicotinic acid benzyl ester, etc.); (l) antiseborrheic agents (e.g., sulfur, thianthol, etc.); (m) anti-inflammatory agents (e.g., tranexamic acid, thiotaurine, hypotaurine, etc.); (n) film-forming agent etc.

[0031] The cosmetic preparation according to the present invention has a solid form, and can be, for example, in the form of a stick. In order to apply the stick-shaped cosmetic preparation directly to the skin, the cosmetic preparation according to the present invention preferably has a relatively high hardness. Specifically, the hardness measured by a rheometer at 37°C with a pressure-sensitive shaft of 1.5φ, a penetration speed of 2 cm / min, and a penetration depth of 10 mm is preferably 20 to 300 mN, and more preferably 30 to 200 mN. A rheometer manufactured by Sun Scientific Co., Ltd. can be used for the measurement. [Example]

[0032] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the contents are expressed in mass % relative to the total amount.

[0033] [Examples 1 to 10, Comparative Examples 1 to 6] Oily solid cosmetic preparations of each Example and Comparative Example were prepared according to the formulations shown in Table 1.

[0034] Furthermore, the performance of these cosmetics was evaluated in terms of water resistance as follows. [Water resistance evaluation] A 5cm x 5cm V-grooved PMMA plate (S-plate, SPFMASTER-PA01, manufactured by Fuji Kasei Co., Ltd.) was coated with 2mg / cm 2A measurement sample was applied with a finger for 60 seconds and allowed to dry for 15 minutes. The absorbance spectrum of the plate containing the measurement sample at 280 nm to 500 nm was then measured using a spectrophotometer (U-3500 self-recording spectrophotometer, Hitachi, Ltd.). The plate was then immersed in a water bath filled with water with a hardness of 50 to 500, and the water in the water bath was stirred at 300 rpm for 30 minutes using a Three-One motor. The plate was then removed from the water bath and allowed to dry at room temperature (25°C ± 5°C) for approximately 15 to 30 minutes until all water droplets on the surface disappeared. The absorbance spectrum was then measured again. The rate of change in absorbance (Abs) before and after the water bath was calculated from the integrated values ​​of absorbance (Abs) at 280 nm to 500 nm before and after the water bath according to the following formula (1). A higher rate of change in absorbance before and after the water bath indicates that the measurement sample did not flow into the water bath, indicating higher water resistance. Therefore, the rate of change in absorbance before and after the water bath was evaluated as "water resistance." [Formula (1)] Absorbance change rate before and after water bath (%) = (integrated absorbance value after water bath) / (integrated absorbance value before water bath) × 100 The results obtained are shown in Table 1.

[0035] [Table 1-1]

[0036] [Table 1-2] *1: A mixture of polyethylene (85% by mass) and microcrystalline wax (15% by mass). Melting point: 82-90°C *2: Particle size 10-50μm *3: Particle size 10~60μm *4: Particle size 10-50μm

[0037] [Examples 11 to 18] Oil-based solid cosmetic preparations of the examples were prepared using the formulations shown in Table 2, with the type of component (B) varied. The water resistance of the obtained cosmetic preparations was evaluated in the same manner as in Example 1. The results obtained are shown in Table 2.

[0038] [Table 2] *1: A mixture of polyethylene (85% by mass) and microcrystalline wax (15% by mass). Melting point: 82-90°C *2: Particle size 10-50μm *3: Particle size 10~60μm

Claims

1. (A) a gelling agent, (B) a silicone surfactant, and (C) UV scattering agent An oily solid cosmetic comprising: The oily solid cosmetic has a ratio B / C of the content of component (B) to the content of component (C) contained in the oily solid cosmetic of 0.01 to 0.

5.

2. of the total mass of the oily solid cosmetic The content of component (A) is 3 to 30 mass %, The content of the (B) component is 0.2 to 20 mass %, The content of the (C) component is 5 to 40 mass%. The oily solid cosmetic according to claim 1.

3. 3. The oily solid cosmetic preparation according to claim 1, wherein component (A) is selected from the group consisting of solid waxes and oil gelling agents.

4. 3. The oily solid cosmetic preparation according to claim 1, wherein component (A) is a solid wax.

5. 3. The oily solid cosmetic preparation according to claim 1, wherein component (A) is a solid wax having a melting point of 50°C or higher at normal pressure.

6. 3. The oily solid cosmetic preparation according to claim 1, wherein component (B) has a polyoxyalkylene chain bonded to a main chain having a polysiloxane structure.

7. 3. The oily solid cosmetic preparation according to claim 1, wherein the HLB value of component (B) is 0.1 to 18.

8. 3. The oily solid cosmetic preparation according to claim 1, wherein component (C) is a finely divided metal oxide.

9. 3. The oily solid cosmetic preparation according to claim 1, wherein the surface of component (C) has been subjected to a hydrophobic treatment.

10. 3. The oily solid cosmetic according to claim 1, wherein the content of water contained in the oily solid cosmetic is 2% by mass or less based on the total mass of the oily solid cosmetic.

11. The oily solid cosmetic preparation according to claim 1 or 2, further comprising (D) an oil component.

12. The oily solid cosmetic according to claim 1 or 2, which is a non-emulsified oily solid cosmetic.

13. 3. The oily solid cosmetic preparation according to claim 1, wherein the hardness is 20 to 300 mN as measured by a rheometer at 37°C with a pressure-sensitive shaft of 1.5φ, a penetration speed of 2 cm / min, a penetration depth of 10 mm.

14. A method for producing an oily solid cosmetic, comprising blending a silicone surfactant into the oily solid cosmetic as a water resistance improver.

15. An oily solid cosmetic comprising a silicone surfactant as a water resistance improver.

Images