Cosmetics

Abstract

To suppress the occurrence of color stripes in cosmetics containing two or more types of pigments with different average particle sizes.SOLUTION: Provided is a cosmetic containing at least two types of pigments with different average particle sizes, the cosmetic being filled in up to a height of 10 mm of a borosilicate glass container with a body diameter of φ35 mm, a brightness L* specified by a color system CIE1976 L*a*b* that is measured by an SCI method from the bottom of the filled glass container with a C light source being 65 or less, the cosmetic containing behenic acid or a derivative thereof, and the blending amount thereof being 0.15 to 2 mass% with respect to the total amount of the cosmetic.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to cosmetics, and in particular to cosmetics containing pigments and having low brightness. [Background technology]

[0002] Conventionally, inorganic powders have been blended into cosmetics to provide functions such as protecting the skin from ultraviolet rays, concealing blemishes and freckles, and absorbing sebum. Inorganic powders are difficult to disperse in oil-based bases, and in the case of emulsion cosmetics, when a surfactant is added to an oil phase containing the powder and then an aqueous phase is added to emulsify, aggregation may occur due to interactions between the powder, the surfactant, and the water. To solve this problem, the applicant has proposed a powder cosmetic in which the powder is less likely to aggregate in a low viscosity range (Patent Document 1).

[0003] Cosmetics, particularly cosmetics such as foundations, contain pigments as so-called coloring materials in addition to the inorganic powders described above (for example, Patent Document 2). In order to prepare subtle shades, multiple types of pigments are generally mixed, and in order to make the subtle shades easier to see, they are often distributed on the market in transparent containers. In recent years, there has been a demand for darker foundations depending on the season and the situation in which they are used. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-256450 A [Patent Document 2] JP 2018-35092 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0005] It has been found that when cosmetics are prepared using multiple dark-colored pigments in response to such requirements, color stripes occur due to stirring during preparation. These color stripes are a serious problem because they give a poor appearance when distributed in transparent containers and consumers may perceive them as a quality problem. In addition, gel-like cosmetics are prone to syneresis, a phenomenon in which moisture held between polymers separates, so it is preferable to further suppress syneresis and improve stability.

[0006] In other words, an object of the present invention is to provide a cosmetic composition that is capable of suppressing the occurrence of color streaks and syneresis in a cosmetic composition that contains two or more pigments having different average particle sizes and is dark in color, in other words, has low brightness. [Means for solving the problem]

[0007] The cosmetic composition of the present invention comprises: (A) at least two types of pigments having different average particle sizes; (B) behenic acid or a derivative thereof, A cosmetic comprising: (B) the amount of behenic acid or its derivative is 0.15 to 2% by mass based on the total amount of the cosmetic; This cosmetic is filled to a height of 10 mm into a borosilicate glass container with a body diameter of φ35 mm, and the lightness L* defined by the CIE1976 L*a*b* color system, measured from the bottom of the glass container using the SCI method with light source C, is 65 or less.

[0008] It is preferable that the cosmetic composition of the present invention further comprises a surfactant (C).

[0009] The (C) surfactant is preferably a sorbitan derivative.

[0010] Preferably, the sorbitan derivative is sorbitan sesquiisostearate.

[0011] It is preferable that the cosmetic composition of the present invention further contains (D) a volatile linear silicone.

[0012] The cosmetic composition of the present invention is preferably of the water-in-oil type. Effect of the Invention

[0013] The cosmetic composition of the present invention comprises: (A) at least two types of pigments having different average particle sizes; (B) behenic acid or a derivative thereof, and the blending amount of (B) behenic acid or a derivative thereof is 0.15 to 2 mass% based on the total amount of the cosmetic, When this cosmetic is filled to a height of 10 mm in a borosilicate glass container with a body diameter of φ35 mm and the lightness L* defined in the CIE1976 L*a*b* color system measured from the bottom of the glass container by the SCI method using a C light source is 65 or less, it is possible to suppress pigment classification due to differences in the average particle size of the pigments and to suppress the occurrence of color streaks and syneresis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The cosmetic composition of the present invention comprises: (A) at least two types of pigments having different average particle sizes; (B) behenic acid or a derivative thereof, A cosmetic comprising: (B) the amount of behenic acid or its derivative is 0.15 to 2% by mass based on the total amount of the cosmetic; This cosmetic is filled to a height of 10 mm into a borosilicate glass container with a body diameter of φ35 mm, and the lightness L* defined by the CIE1976 L*a*b* color system, measured from the bottom of the glass container using the SCI method with light source C, is 65 or less. Each component will be described in detail below. In this specification, PEG is an abbreviation for polyethylene glycol, POE is an abbreviation for polyoxyethylene, and POP is an abbreviation for polyoxypropylene.

[0015] (A) Pigment The cosmetic of the present invention contains at least two kinds of pigments with different average particle sizes. Here, the pigment is a pigment that does not dissolve in water and colors an object, and is an inorganic pigment such as a white pigment or a colored pigment. More specifically, examples of the pigment include white pigments such as titanium dioxide (coloring pigments have an average particle size of 100 nm or more), zinc oxide, and colored pigments such as red ocher, yellow iron oxide, black iron oxide, ultramarine, Prussian blue, manganese violet, and carbon black. The pigment may be surface-treated (hydrophobized, hydrophilized, water-repellent, etc.) as necessary. Examples of the hydrophobized treatment include tetrahydrotetramethylcyclotetrasiloxane (EP-1 treatment), triethoxycaprylylsilane (OTS treatment), etc.

[0016] The average particle size is measured by the laser diffraction scattering method (dry type) using a particle size distribution analyzer (MT3000) manufactured by Microtrac, and is expressed as the median diameter. Different average particle sizes means that two or more types of pigments contained in a cosmetic product have different average particle sizes to the extent that classification occurs, and although this varies depending on the type of pigment, it is generally assumed that there is a difference of 0.1 to 2 μm in the average particle size.

[0017] The blending amount of the pigment is preferably more than 9.5% by mass and not more than 30% by mass, more preferably 9.6 to 25% by mass, and further preferably 10 to 20% by mass. By blending more than 9.5% by mass, it becomes easier to prepare subtle shades by blending multiple types of pigments, and by blending not more than 30% by mass, usability can be improved.

[0018] (B) Behenic acid or its derivatives The cosmetic of the present invention contains behenic acid (behenic acid) or a derivative thereof. Examples of the derivatives of behenic acid include behenyl alcohol, behenic acid ester, behenic acid amide, behenic acid salt, behenic acid carbonate, behenic acid carbamate, behenic acid imide, and / or behenic acid anhydride. Examples of the behenic acid ester include glyceryl behenate, such as glyceryl (behenic acid / eicosane diacid) (commercially available product Nomcoat HK-G (manufactured by Nisshin Oillio Group, Ltd.)), polyglyceryl-10 (behenic acid / eicosane diacid) (commercially available product Nomcoat HK-P (manufactured by Nisshin Oillio Group, Ltd.)), and the like. These behenic acids or their derivatives may be used alone or in combination of two or more.

[0019] The content of (B) behenic acid or its derivatives in the total cosmetic is 0.15 to 2% by mass, preferably 0.2 to 0.8% by mass, and more preferably 0.25 to 0.7% by mass. By including (B) behenic acid or its derivatives in the total cosmetic, it is possible to suppress the occurrence of color stripes. Furthermore, by including (B) behenic acid or its derivatives in the total cosmetic, it is possible to achieve a light texture that spreads easily on the skin.

[0020] (brightness) The lightness of the cosmetic of the present invention is 65 or less in lightness L* as defined by the CIE1976 L*a*b* color system, measured by filling the cosmetic with a height of 10 mm in a borosilicate glass container having a body diameter of φ35 mm and measuring from the bottom of the glass container by the SCI (Specular Component Include) method using a C light source. A lightness L* of 65 or less allows the cosmetic to have a deep color. More preferably, the lightness L* is 60 or less, and even more preferably 55 or less.

[0021] (C) Surfactant The cosmetic composition of the present invention preferably further contains a surfactant. By containing a surfactant, the dispersibility of the pigment can be improved. Among the surfactants, from the viewpoint of improving dispersibility, it is preferable to use a surfactant with an HLB of 7 or less.

[0022] Examples of such surfactants include sorbitan derivatives, such as fatty acid modified sorbitan (e.g., sorbitan sesquiisostearate), which is a type of ester compound in which sorbitan is bound to a fatty acid; polyglycerol fatty acid esters (e.g., glycerol monocottonseed oil fatty acid, glycerol monoerucate, glycerol sesquioleate, glycerol monostearate, α,α'-glycerol pyroglutamate oleate, glycerol monostearate malate, etc.); sorbitan fatty acid esters (e.g., sorbitan monooleate, sorbitan monoisostearate, solanacid, etc.); Examples of surfactants include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexyl acid, diglycerol sorbitan tetra-2-ethylhexyl acid, etc.), glycerin fatty acid ester, sucrose fatty acid ester, diglycerin fatty acid ester, ethylene glycol fatty acid ester, propylene glycol fatty acid ester (e.g., propylene glycol monostearate, etc.), hydrogenated castor oil derivatives, polyglycerin alkyl ether, etc. These surfactants may be used alone or in combination of two or more.

[0023] (D) Volatile linear silicone The cosmetic of the present invention preferably further comprises (D) a volatile linear silicone. The volatile linear silicone oil is a silicone oil having a boiling point of 250° C. or less at 1 atmosphere (101.325 kPa). Examples of the volatile linear silicone oil include low molecular weight methylpolysiloxanes (1 cS, 1.5 cS, 2 cS, etc.) such as octamethyltrisiloxane, decamethyltrisiloxane, and dimethicone (dimethylpolysiloxane).

[0024] The blending amount of the volatile linear silicone oil is preferably 2 to 30% by mass, more preferably 5 to 20% by mass, based on the total amount of the cosmetic. By having the volatile linear silicone oil be 2% by mass or more based on the total amount of the cosmetic, the skin condition during and after application can be made smoother, and by having the amount be 30% by mass or less, a smoother feeling of use without oiliness can be achieved.

[0025] The viscosity of the cosmetic of the present invention is preferably 5000 to 50000 mPa·s, more preferably 8000 to 45000 mPa·s, and even more preferably 10000 to 40000 mPa·s. A viscosity of 50000 mPa·s or less allows for light spreading during application and a better feel when used. On the other hand, a viscosity of 5000 mPa·s or more allows for more sufficient stability. The viscosity referred to here is measured at 30°C using a BL-type viscometer (VS-A type, manufactured by Shibaura Systems) with rotor No. 4, at 12 rpm, and for 1 minute.

[0026] The cosmetic preparation of the present invention may contain, as necessary, appropriate ingredients that are typically used in cosmetics and pharmaceuticals, such as oils, water, alcohols, thickeners, chelating agents, antioxidants, UV absorbers, moisturizers, fragrances, various medicinal ingredients, preservatives, pH adjusters, neutralizing agents, etc.

[0027] Of the above-mentioned optional ingredients, examples of oils include higher fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid; waxes such as solid paraffin, beeswax, hardened castor oil, carnauba wax, and varico wax; animal and vegetable oils and fats such as beef tallow, lard, mutton tallow, squalane, coconut oil, palm oil, palm kernel oil, soybean oil, olive oil, cottonseed oil, jojoba oil, castor oil, and lanolin; mineral oils such as liquid paraffin and petrolatum; and synthetic oils such as trimethylpropane triisostearate, isopropyl myristate, glycerol tri-2-ethylhexanate, pentaerythritol tetra-2-ethylhexanate, and POE·POP pentaerythritol ether.

[0028] Examples of alcohols include straight-chain alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, myristyl alcohol, and oleyl alcohol; higher alcohols such as branched-chain alcohols such as monostearyl glycerin ether, lanolin sulfol, cholesterol, phytosterol, and isostearyl alcohol; lower alcohols such as methanol, ethanol, propanol, and isopropanol; sitosterol; and lanosterol.

[0029] Examples of thickeners include alginic acid polymers such as sodium alginate and propylene glycol alginate, vinyl polymers such as polyvinyl methyl ether and carboxyvinyl polymer, POE polymers, POE-POP copolymer polymers, acrylic polymers such as sodium polyacrylate and polyacrylic acid amide, polyethyleneimine, cationic polymers, bentonite, aluminum magnesium silicate, laponite, hectorite, inorganic water-soluble polymers such as silicic anhydride, and the like.

[0030] Chelating agents include citramalic acid, agaric acid, glyceric acid, shikimic acid, hinokitiol, gallic acid, tannic acid, caffeic acid, ethylenediaminetetraacetic acid, and ethylene glycol. Examples of suitable phosphoric acid include diethyldiaminetetraacetic acid, diethylenetriaminepentaacetic acid, phytic acid, polyphosphoric acid, metaphosphoric acid, and analogs thereof, as well as alkali metal salts and carboxylate esters thereof.

[0031] Examples of ultraviolet absorbers include benzoic acid-based ultraviolet absorbers such as para-aminobenzoic acid; anthranilic acid-based ultraviolet absorbers such as methyl anthranilate; salicylic acid-based ultraviolet absorbers such as octyl salicylate; cinnamic acid-based ultraviolet absorbers such as isopropyl paramethoxycinnamate and octyl paramethoxycinnamate; pyridazine derivatives such as dimorpholinopyridazinone; benzoylmethane derivatives such as 4-methoxy-4'-t-butyldibenzoylmethane; 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzoylmethane, 4-methoxy-4'-t-butyldi ... Examples of the compound include camphor derivatives such as dilidene-d,l-camphor; benzotriazole derivatives such as 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, and 2-(2'-hydroxy-5'-methylphenylbenzotriazole; and others include 2-phenyl-5-methylbenzoxazole; dibenzalazine; dianisoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one.

[0032] Moisturizing agents include polyethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, D-mannitol, glucose, fructose, sodium chondroitin sulfate, sodium hyaluronate, sodium lactate, glucosamine, and cyclodextrin.

[0033] As medicinal ingredients, vitamins such as vitamin A oil, retinol, retinol palmitate, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, dl-α-tocopherol nicotinate, magnesium ascorbyl phosphate, vitamin D2, dl-α-tocopherol, pantothenic acid, biotin, etc.; anti-inflammatory agents such as azulene and glycyrrhizin; skin whitening agents such as arbutin, hormones such as estradiol; astringents such as zinc oxide and tannic acid; cooling agents such as L-menthol and camphor; and other ingredients such as lysozyme chloride, pyridoxine hydrochloride, and sulfur. In addition, various extracts that show various medicinal effects can be blended. That is, Houttuynia cordata extract, Phellodendron bark extract, Licorice extract, Peony extract, Peony extract, Loofah extract, Saxifrage extract, Eucalyptus extract, Clove extract, Horse chestnut extract, Cornflower extract, Seaweed extract, Thyme extract, etc. can be included.

[0034] Examples of preservatives include paraoxybenzoic acid esters such as methylparaben, ethylparaben, and butylparaben, benzoic acid, salicylic acid, sorbic acid, parachlorometacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, photosensitizers, and phenoxyethanol.

[0035] Examples of the neutralizing agent include 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, potassium hydroxide, potassium hydroxide, triethanolamine, and sodium carbonate.

[0036] Examples of pH adjusters include lactic acid, citric acid, glycolic acid, succinic acid, tartaric acid, malic acid, sodium bicarbonate, and ammonium bicarbonate.

[0037] Antioxidants include ascorbic acid, α-tocopherol, carotenoids, and the like.

[0038] The above-mentioned components are merely examples and are not intended to be limiting. These components can be appropriately combined and blended according to a prescription appropriate for the desired form.

[0039] The cosmetic of the present invention can be in the form of water-in-oil (W / O) and is produced from the above-mentioned components by a conventional method. Specific product forms include emulsions, skin care creams, makeup bases, hair creams, liquid foundations, cushion foundations, eyeliners, mascaras, eyeshadows, and other emulsion or cream products. EXAMPLES

[0040] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to the following examples in any way.

[0041] [Examples 1 to 3 and Comparative Examples 1 to 8] Water-in-oil cosmetic compositions were prepared by a conventional method according to the formula shown in Table 1, and the lightness L* of the obtained cosmetic compositions, as defined by the CIE1976 L*a*b* color system, was measured under the conditions shown below. Color streaks and separation were also evaluated according to the following criteria.

[0042] The details of the raw material product names in the table are as follows: In the table, pigment grade titanium oxide, hydrophobized iron oxide (red), hydrophobized iron oxide (yellow), and hydrophobized iron oxide (black) are pigments. Lauryl PEG-9 polydimethylsiloxyethyl dimethicone: Silicone SC0928SL (Shin-Etsu Chemical Co., Ltd.) PEG-10 Dimethicone: Silicone SC9450N (Shin-Etsu Chemical Co., Ltd.) Diphenylsiloxyphenyl trimethicone: Silicon KF56 (manufactured by Shin-Etsu Chemical Co., Ltd.) Sorbitan sesquiisostearate: Estemol 182V (manufactured by Nisshin Oillio Group Co., Ltd.) Dimethicone: Silicone KF-96A-2CS (Shin-Etsu Silicone Co., Ltd.) Disteardimonium hectorite: Benton 38 VCG (manufactured by Elementis Specialties) Fine particle titanium dioxide: (average particle size: 15 nm) Pigment-grade titanium dioxide: (average particle size: 250 nm) Hydrophobic iron oxide (red): (average particle size: 660 nm) Hydrophobic iron oxide (yellow): (average particle size: 400 nm) Hydrophobic iron oxide (black): (average particle size: 1.6 μm) PEG-20: Polyethylene glycol 1500 (NOF Corporation)

[0043] <Measurement of brightness> Each cosmetic example was filled to a height of 10 mm into a borosilicate glass container (Maruemu Co., Ltd., screw-top vial, 50 mL, transparent No. 7) with a mouth inner diameter of φ20.3 mm and a body diameter of φ35 mm, and the light was measured from the bottom of the glass container using the SCI method with a C-type light source. The lightness L* was 24 in all cases.

[0044] <Color stripes> Each cosmetic example was placed in a Three-One Motor (manufactured by Shinto Chemical Co., Ltd.) with a turbine-type stirring blade attached so that the bottom of the stirring blade was in contact with the surface of the cosmetic example. After rotating at 12 rpm for 4 hours, the bulk was visually observed and evaluated according to the following criteria. (Evaluation Criteria) A: No color stripes B: There are blurred color stripes in a small area, but the overall appearance is fine. C: Wide, blurred color stripes D: There are clear color stripes.

[0045] <Let's go> Each cosmetic example was allowed to stand at 50° C. for 4 weeks, after which the presence or absence of separation (oil floating) was visually observed and evaluated according to the following evaluation criteria. (Evaluation Criteria) A: I can't let go B: A small amount of transparent liquid is visible on the surface. C: Clear liquid is observed.

[0046] [Table 1]

[0047] As shown in Table 1, in the examples, no syneresis occurred, and color stripes were suppressed to a level that did not cause any problems in appearance. On the other hand, in Comparative Example 1, in which sorbitan sesquiisostearate and behenic acid used in the examples were omitted, Comparative Example 2, in which behenic acid was omitted, and Comparative Examples 3 and 4, in which isostearic acid was used instead of behenic acid, color stripes occurred, causing problems in appearance. In Comparative Example 5, in which isostearic acid was highly blended instead of behenic acid, no color stripes occurred, but syneresis was significantly observed. In Comparative Example 6, in which stearic acid was used instead of behenic acid, Comparative Example 7, in which palmitic acid was used instead of behenic acid, and Comparative Example 8, in which myristic acid was used instead of behenic acid, no color stripes occurred, but syneresis was observed and stability was reduced.

Claims

[Claim 1] (A) at least two types of pigments having different average particle sizes; (B) behenic acid, (C) sorbitan sesquiisostearate, (D) a linear silicone having a boiling point of 250° C. or less at 1 atmosphere (101.325 kPa); A cosmetic comprising: the pigment is titanium dioxide (having an average particle size of 100 nm or more), zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, ultramarine, Prussian blue, manganese violet, or carbon black; The blending amount of the component (A) is more than 9.5% by mass and 30% by mass or less based on the total amount of the cosmetic, The blending amount of the (B) component is 0.15 to 2 mass% based on the total amount of the cosmetic, The blending amount of the (D) component is 2 to 30% by mass based on the total amount of the cosmetic, The cosmetic composition is filled in a borosilicate glass container having a body diameter of 35 mm to a height of 10 mm, and the CIE1976 L ＊ a ＊ b ＊ Lightness L specified in the color system ＊ is 65 or less, The cosmetic is a water-in-oil type cosmetic.

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