Liquid cosmetic and applicator

Abstract

To provide a liquid cosmetic enabling suppression of deterioration in discharge performance with time.SOLUTION: The liquid cosmetic comprises a composite pigment containing a colorant and aluminum hydroxide, a chelating agent, and water.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to liquid cosmetics and applicators. [Background technology]

[0002] 2. Description of the Related Art Liquid cosmetics (such as eyeliners) are used to form lines on the surface of the skin or the like by applying them with an applicator or the like.

[0003] Patent Document 1 discloses a liquid cosmetic having good storage stability and ease of use, which contains an organic pigment, a phosphate ester or a salt thereof, an alkyl acrylate copolymer or a salt thereof, a film-forming agent, and water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-199454 Summary of the Invention [Problem to be solved by the invention]

[0005] Liquid cosmetics containing a composite pigment (such as an aluminum lake pigment) containing a colorant and aluminum hydroxide are sometimes used. Such liquid cosmetics can cause problems such as poor discharge due to increased viscosity and decreased dispersibility over time.

[0006] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a liquid cosmetic that can suppress deterioration of ejection properties over time. [Means for solving the problem]

[0007] The liquid cosmetic according to at least one embodiment of the present invention comprises: a composite pigment comprising a colorant and aluminum hydroxide; A chelating agent; Water and Contains:

[0008] Moreover, an applicator according to at least one embodiment of the present invention comprises: An application unit; a liquid storage section that stores the liquid cosmetic; Equipped with The liquid cosmetic is configured to be supplied from the liquid storage section to the application section. [Effects of the Invention]

[0009] According to at least one embodiment of the present invention, a liquid cosmetic is provided that can suppress deterioration of ejection properties over time. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a longitudinal cross-sectional view of an applicator according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] (Composition of liquid cosmetics) A liquid cosmetic according to some embodiments contains a composite pigment including a colorant and aluminum hydroxide, a chelating agent, and water.

[0013] The above-mentioned liquid cosmetic contains a composite pigment containing a colorant and aluminum hydroxide, a chelating agent, and water, and therefore, due to the interaction between the aluminum hydroxide and colorant constituting the composite pigment and the chelating agent, it is possible to suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic. This is thought to be due to the following reasons. In other words, the aluminum hydroxide that constitutes the composite pigment exists in the form of a hydrate in a liquid cosmetic containing water, and when condensation occurs between the hydrates, a network structure of aluminum hydroxide is formed, which increases the viscosity of the liquid cosmetic and causes the network structure to aggregate while still incorporating the pigment, thereby worsening dispersibility. In this regard, since the above-mentioned liquid cosmetic contains a chelating agent, the interaction between the aluminum and the chelating agent is thought to inhibit condensation between the hydrates of aluminum hydroxide, thereby inhibiting the formation of the above-mentioned network structure and the resulting increase in viscosity and deterioration of dispersibility of the liquid cosmetic. Furthermore, since the surfaces of the colorants that make up the composite pigment contain functional groups that interact electrostatically with each other, it is believed that aggregation of composite pigment particles may occur in the liquid cosmetic. In this regard, since the liquid cosmetic described above contains a chelating agent, the interaction between the colorant and the chelating agent suppresses the electrostatic interaction between the functional groups of the composite pigment, which in turn suppresses aggregation of composite pigment particles in the liquid cosmetic, making it less likely that the dispersibility of the composite pigment particles will decrease. Therefore, the liquid cosmetic described above can suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic, thereby suppressing deterioration of dischargeability over time in an applicator to which the liquid cosmetic is applied.

[0014] The composite pigment described above is, for example, a colorant (pigment or dye) that is insolubilized by adsorption onto aluminum hydroxide as a base material. The composite pigment may be, for example, an aluminum lake of the colorant (pigment or dye).

[0015] The colorant constituting the composite pigment may be an organic pigment or an acid dye.

[0016] The organic pigments described above may be organic pigments that can be used in cosmetics in general, or organic pigments that can be used in cosmetics for mucous membranes. Examples of organic pigments that can be used in cosmetics for mucous membranes include Red No. 202 (CI Red 202). 15850, Red 7), Red 203, Red 204, Red 205 (CI 15630), Red 206 (CI 15630), Red 207 (CI 15630), Red 208 (CI 15630), Red 219 (CI 15800, Red 31), Red 220 (CI 15880, Red 34), Red 221 (CI 12120), Red 226 (CI 73360, Red 30), Red 228 (CI 12085, Red 36), Orange 203 (Pigment Orange 5), Orange 204, Yellow 205 (Pigment Yellow 12), Blue 201 (CI 73000) or Blue 204 (CI 69825).

[0017] The composite pigment may also be a pigment in which an acid dye is laked on aluminum hydroxide as a base material. Examples of lake pigments that can be used in cosmetics in general include Red No. 2 Aluminum Lake, Red No. 3 Aluminum Lake, Red No. 102 Aluminum Lake, Red No. 104(1) Aluminum Lake, Red No. 105(1) Aluminum Lake, Red No. 106 Aluminum Lake, Yellow No. 4 Aluminum Lake, Yellow No. 5 Aluminum Lake, Green No. 3 Aluminum Lake, Blue No. 1 Aluminum Lake, and Blue No. 2 Aluminum Lake. Lake pigments that can be used in cosmetics for mucous membranes include Red No. 227 Aluminum Lake, Red No. 230(1) Aluminum Lake, Red No. 230(2) Aluminum Lake, Red No. 231 Aluminum Lake, Red No. 232 Aluminum Lake, Orange No. 205 Aluminum Lake, Orange No. 207 Aluminum Lake, Yellow No. 202(1) Aluminum Lake, Yellow No. 202(2) Aluminum Lake, Yellow No. 203 Aluminum Lake, Green No. 201 Aluminum Lake, Green No. 204 Aluminum Lake, Green No. 205 Aluminum Lake, and Blue No. 205 Aluminum Lake.

[0018] The average particle size (volume-based) of the composite pigment may be 1.0 μm or less, or 0.5 μm or less.

[0019] The smaller the particle size of the composite pigment, the larger the surface area, and therefore the interaction between the composite pigment particles in the liquid cosmetic product is likely to form the above-mentioned network structure, which tends to thicken the liquid cosmetic product, or the composite pigment particles are likely to aggregate, which tends to deteriorate the dispersibility of the composite pigment in the liquid cosmetic product. In this regard, even in liquid cosmetic products containing a small composite pigment with an average particle size of 1.0 μm or less or 0.5 μm or less, as described above, the interaction between the aluminum hydroxide and colorant that constitute the composite pigment and the chelating agent can suppress the thickening of the liquid cosmetic product over time and the aggregation of the composite pigment particles in the liquid cosmetic product. Therefore, deterioration of the discharge performance over time can be suppressed in an applicator to which the liquid cosmetic product is applied.

[0020] The average particle size of the composite pigment may be 0.1 μm or more and 1.0 μm or less, or 0.1 μm or more and 0.5 μm or less. If the average particle size of the composite pigment is 0.1 μm or more, the viscosity of the liquid cosmetic is less likely to become excessively high. Furthermore, if the average particle size of the composite pigment is 1.0 μm or less or 0.5 μm or less, the composite pigment is more likely to be stably dispersed in the liquid cosmetic.

[0021] The content of the composite pigment in the liquid cosmetic may be 3% by weight or more and 30% by weight or less, or 5% by weight or more and 20% by weight or less. If the content of the composite pigment is 3% by weight or more or 5% by weight or more, the color of the liquid cosmetic will be relatively deep, and the functionality as a cosmetic will be good. Furthermore, if the content of the composite pigment is 30% by weight or less or 20% by weight or less, the dispersibility of the composite pigment in the liquid cosmetic will be good, and color unevenness of the liquid cosmetic will be easily suppressed.

[0022] As the chelating agent, one having a chelating effect on aluminum or colorants can be used.

[0023] Specific examples of chelating agents include citric acid, gluconic acid, lactic acid, disodium EDTA, sodium citrate, EDTA (ethylenediaminetetraacetic acid), trisodium EDTA, tetrasodium EDTA, etidronic acid, trisodium ethylenediaminedisuccinate, sodium gluconate, tetrasodium glutamate diacetate, trisodium HEDTA (hydroxyethylethylenediaminetriacetate), phytic acid, sodium phytate, sodium hexametaphosphate, and sodium metaphosphate.

[0024] The chelating agent may be gluconic acid or citric acid. In this case, interaction between the chelating agent and the aluminum hydroxide and colorant constituting the composite pigment is likely to be obtained. This is thought to be because gluconic acid and citric acid have an appropriate molecular weight and contain a relatively large number of carboxyl groups or hydroxyl groups in the molecule.

[0025] The content of the chelating agent in the liquid cosmetic may be 0.005% by weight or more and 5.0% by weight or less, or 0.01% by weight or more and 1.0% by weight or less.

[0026] If the content of the chelating agent in the liquid cosmetic is 0.005% by weight or more or 0.01% by weight or more, the interaction between the chelating agent and the aluminum hydroxide and colorant that constitute the composite pigment makes it easy to appropriately suppress the formation of the above-mentioned network structure and aggregation of the composite pigment. Furthermore, if the content of the chelating agent in the liquid cosmetic is 5.0% by weight or less or 1.0% by weight or less, it is easy to suppress adverse effects that can occur due to an excessive content of the chelating agent (for example, deterioration of the dispersibility of the composite pigment due to interaction between the chelating agent and components in the liquid cosmetic other than the composite pigment).

[0027] The water contained in the liquid cosmetic preparation is the main component and main solvent of the liquid cosmetic preparation. The water may be ion-exchanged water, purified water, pure water, or ultrapure water.

[0028] The water content in the liquid cosmetic may be 40% by weight or more and 90% by weight or less, or 50% by weight or more and 80% by weight or less. If the water content is 40% by weight or more or 50% by weight or more, other components (solvents, surfactants, etc.) are easily dissolved in water. If the water content is 90% by weight or less or 80% by weight or less, the content of other components (copolymers, solvents, pigments, etc.) can be increased, making it easier to form a film of the liquid cosmetic on the skin or the surface of an applicator, or to make the color of the liquid cosmetic sufficiently dark.

[0029] The liquid cosmetic may contain a dispersant to aid in the dispersion of the composite pigment in the liquid cosmetic. The dispersant may be, for example, a nonionic surfactant or an anionic surfactant.

[0030] Examples of nonionic surfactants include polyoxyethylene behenyl ether, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, and polyoxyethylene stearyl ether.

[0031] Examples of anionic surfactants include alkyl phosphates, polyoxyalkylene alkyl ether phosphates, sulfonates, alkyl sulfates, polyaspartates, N-acylmethyl taurates, and polyoxyethylene alkyl ether sulfates.

[0032] The content of the dispersant in the liquid cosmetic may be 1.0% by weight or more and 5.0% by weight or less. If the content of the dispersant in the liquid cosmetic is within the above range, the composite pigment will be easily dispersed appropriately in the liquid cosmetic.

[0033] The liquid cosmetic may contain a film-forming agent to assist in the formation of a film of the liquid cosmetic on the surface of the skin, etc. The film-forming agent may be, for example, a (styrene / acrylates) copolymer (i.e., a copolymer synthesized from styrene and one or more selected from an acrylic acid alkyl ester, a methacrylic acid alkyl ester, acrylic acid, and methacrylic acid). The (styrene / acrylates) copolymer as a film-forming agent may be contained in the liquid cosmetic in the form of emulsion particles.

[0034] The emulsion particles of the above-mentioned copolymer are available in the form of an emulsion containing the emulsion particles (hereinafter referred to as a copolymer emulsion), and this copolymer emulsion can be used as a material for liquid cosmetics.

[0035] The above-mentioned copolymer emulsion may be blended in a liquid cosmetic, for example, in the form of an emulsion in which water is used as a medium and the solid content concentration is 30 to 60% by weight.

[0036] The copolymer emulsion particles may have a spherical, plate-like, needle-like, hollow, solid or porous shape.

[0037] The content (as solid content) of the above-mentioned film-forming agent (e.g., styrene / acrylates copolymer) in the liquid cosmetic may be 2% by weight or more and 30% by weight or less, 4% by weight or more and 24% by weight or less, or 6% by weight or more and 20% by weight or less.

[0038] If the content of the film-forming agent is 2% by weight or more, 4% by weight or more, or 6% by weight or more, the viscosity of the liquid cosmetic will not become too low, and excessive ejection of the liquid cosmetic will be suppressed when, for example, an applicator described below is used.If the content of the film-forming agent is 30% by weight or less, 24% by weight or less, or 20% by weight or less, the viscosity of the liquid cosmetic will not become too high, and the liquid cosmetic will be more likely to be ejected appropriately when, for example, an applicator described below is used.

[0039] Liquid cosmetic preparations may contain other solvents in addition to water, which is the main solvent. Solvents are used to impart various functions to the liquid cosmetic preparation (e.g., preventing corrosion, freezing, drying, etc.).

[0040] As the solvent, any known solvent that is commonly used in cosmetics can be used without any particular limitation. Examples of the solvent include alcohols, including monohydric alcohols and polyhydric alcohols. The solvents can be used alone or in combination of two or more.

[0041] The solvent content in the liquid cosmetic may be 1% by weight or more and 40% by weight or less, or may be 3% by weight or more and 30% by weight or less. If the solvent content is 1% by weight or more or 3% by weight or more, the liquid cosmetic is likely to be sufficiently imparted with the above-mentioned functions (anti-corrosion, etc.). If the solvent content is 40% by weight or less or 30% by weight or less, the liquid cosmetic does not cause much irritation to the skin when applied to the skin.

[0042] The liquid cosmetic according to some embodiments may contain other additives (for example, preservatives) in addition to the above-mentioned components.

[0043] The liquid cosmetic according to some embodiments may include a preservative.

[0044] In this specification, the term "preservative" refers to a substance that has antiseptic, antiseptic enhancement, preservation, antibacterial, antifungal, and antioxidant functions. Examples of preservatives include phenoxyethanol, pentylene glycol, ethanol, parahydroxybenzoic acid ester, 1,2-pentanediol, pryl glycol, hexylene glycol, dehydroacetic acid, sodium dehydroacetate, ethylhexylglycerin, ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,2-hexanediol, and the like. Diol and 1,2-heptanediol, methylparaben and its salts, ethylparaben and its salts, butylparaben and its salts, propylparaben and its salts, isobutylparaben and its salts, isopropylparaben, benzylparaben, isopropylmethylphenol, chlorhexidine gluconate solution, trichlorocarbanilide, carbolic acid, hexachlorophene, benzoic acid and its salts, undecylenic acid, salicylic acid, sorbic acid and its salts, photosensitizer No. 101, photosensitizer No. 201, photosensitizer No. 401, hinokitiol, Benzyl alcohol, piroctone olamine, iodopropynyl butylcarbamate, methyldibromoglutaronitrile, DMDM ​​hydantoin, cetyltrimethylammonium chloride, cetylpyridinium chloride, benzethonium chloride, diisobutylethoxyethyldimethylbenzylammonium chloride, sodium N-lauryl sarcosinate, sodium N-palmethyl sarcosinate, lauroyl sarcosine, N-myristoyl glycine, potassium N-lauryl sarcosine, trimethylammonium chloride, aluminum chlorohydrin Sodium hydroxylactate, triethyl citrate, tricetylmethylammonium chloride, 2,4,4'-trichloro-2'-hydroxydiphenyl ether (triclosan), 1,5-pentanediol, 1,6-hexanediol, 3,4,4'-trichlorocarbanilide (triclocarban), diaminoalkylamide, L-lysine hexadecylamide, heavy metal citrate salts, salicylate, piroctose, zinc salts, pyrithione and its heavy metal salts, zinc pyrithione, zinc phenol sulfate, farnesol,Ketoconazole, oxiconazole, bifonazole, butoconazole, cloconazole, clotrimazole, econazole, enilconazole, fenticonazole, isoconazole, miconazole, sulconazole, tioconazole, fluconazole, itraconazole, terconazole, naftifine, terbinafine, selenium disulfide, methylchloroisothiazolinone, methylisothiazolinone, silver chloride, diazolidinyl urea, imidazolidinyl urea, undecylenic acid, chlorphenesin, propionic acid and its salts, salicylic acid, salicylic acid Magnesium, Sodium Salicylate, Titanium Salicylate, Chloroxylenol, Sodium Salicylate of Diethylhexyl Sulfosuccinate, Sodium Benzoate, (RS)-1-(4-Chlorophenoxy)-1-imidazol-1-yl-3,3-dimethylbutan-2-one (Climbazole), Benzyl Alcohol, Phenoxyisopropanol, 2-Bromo-2-nitropropane-1,3-diol, Polyaminopropyl Biguanide, Iodopropynyl Butylcarbamate, Benzalkonium Chloride, Benzethonium Chloride , pentanediol, 1,2-octanediol, sorbic acid, benzoic acid, lactic acid, imidazolidinyl urea, diazolidinyl urea, dimethyloldimethylhydantoin (DMDMH), chlorhexidine, sodium salt of hydroxymethylglycinate, hydroxyethylglycine of sorbic acid, N-oleylhydroxyhexanamide, phenylphenol and its salts, o-phenylphenol and its salts, p-chloro-m-cresol, p-chlorophenol, imidazolidinyl urea, copper usnic acid, oligopeptide-10, oligopeptide-76 , Formic Acid, Sodium Formate, Silver Citrate, Quaternium-14, Quaternium-15, Glyoxal, Grapefruit Extract, Grapefruit Fruit Extract, Grapefruit Seed Extract, Cresol, Chloramine T, Chloroxylenol, Chlorcresol, Chlorobutanol, Silica Acid (Ammonium / Silver / Zinc / Al), Glycerin, Alpinia Zea Mays Flower / Leaf / Seed / Stem Extract, Alpinia Zea Mays Leaf / Stem Fermentation Product, Rubus Rubus Extract, Coriander Leaf Extract, Pomegranate Peel Extract, Santalum Paniculatum Wood Water, Hexamidine Diisethionate, 1,2-EthanediolSodium citronellate, Siberian larch wood extract, tocopherol, trimonium bromide, thyme leaf oil, thianthol, tea tree oil, basil, thiamine bislauryl sulfate, sodium hydroxymethylglycine, phenethyl alcohol, phenol, sodium phenolsulfonate, ferulic acid, ethyl ferulate, benzethonium chloride, silver borosilicate, Boesenbergia pansulata rhizome extract, macelignan, soapberry extract, methyl Propanediol, Murayakoenji Leaf Oil, Rosemary Extract, Spiraea Spiraea Leaf Extract, Dimethylaminostyrylheptylmethylthiazolium Iodide, Bisethylquinolinium Ethylquinolinidenepentadiene Iodide, Sodium Lauryldiaminoethylglycine, Ethyl Lauroylarginate HCl, Ammonium Benzoate, Isobutyl Benzoate, Ethyl Benzoate, Pantothenyl Ethyl Benzoate, Phenyl Benzoate, Methyl Benzoate, Domiphen Bromide, Caprylyl Glyceryl caprate (glycerin fatty acid ester), bisabolol, anisic acid, sorbitan caprylate, caprylyl glycol, glyceryl caprate, octanediol, alidimorph, tridemorph, dodemorph, dimethomorph; flusilazole, azaconazole, cyproconazole, epoxiconazole, fluconazole, propiconazole, tebuconazole, etc.; imazalil, thiophanate, benomyl, carbendazim, chlorothialonil, dicloran, Trifloxystrobin, Floxystrobin, Dimoxystrobin, Azoxystrobin, Flucaranil, Prochloraz, Flusulfamide, Famoxadone, Captan, Maneb, Mancozeb, Dodisin, Dodine and Metalaxyl, Butylated Hydroxytoluene (BHT), Butylated Hydroxyanisole (BHA), Propyl Gallate, Octyl Gallate, Carotenoids, β-Carotene, Lycopene, Canthaxanthin, Ubiquinone, Pentaerythrityl Tetra(Dibutyl-hydroxy-cinnamate), Vitamin E, Trolox, Vitamin C and its Derivatives, α-Tocopherol, δ-Tocopherol, Ascorbic Acid, Ginkgo Biloba Extract, Aspalathus Linealis Extract, Disodium Isostearyl Ascorbyl Phosphate, Oolong Tea Extract, Hypericum Perforatum Extract, Coffee Extract, Coffee Seed Extract, Hypericum Perforatum Flower / Leaf / Stem Extract,Achillea millefolium extract, sericin, thyme flower / leaf / stem extract, thyme extract, tea extract, tea leaf extract, clove extract, ascorbyl tetra-2-hexyldecanoate, ascorbyl tetrahexyldecanoate, calendula officinalis extract, ascorbyl palmitate phosphate trisodium, Haematococcus pluvialis extract, Haematococcus pluvialis oil, evening primrose seed extract, evening primrose extract, melissa extract, melissa leaf extract, magnesium ascorbyl L-phosphate, magnesium ascorbyl phosphate, etc., among which 1,2- Hexanediol, caprylyl glycol, pentylene glycol, 1,3-butylene glycol, dipropylene glycol, hexylene glycol, phenoxyethanol, ethanol, glyceryl caprate, ethylhexylglycerin, sodium dehydroacetate, sodium benzoate, methylparaben and its salts, ethylparaben and its salts, butylparaben and its salts, propylparaben and its salts, isobutylparaben and its salts, isopropylparaben, and benzylparaben are known to have excellent long-term storage properties and are therefore preferred. These preservatives may be used alone or in combination of two or more.

[0045] The content of these preservatives in the liquid cosmetic may be 1.0 wt% or more and 27.0 wt% or less, or 3.0 wt% or more and 22.0 wt% or less, or 6.0 wt% or more and 17.0 wt% or less, based on the total weight of the cosmetic. When the content of these preservatives is 0.1 wt% or more, 3.0 wt% or more, or 6.0 wt% or more, the preservative performance is sufficiently exhibited. When the content is 27.0 wt% or less, 22.0 wt% or less, or 17.0 wt% or less, the skin irritation is tolerable.

[0046] (Method of manufacturing liquid cosmetics) The liquid cosmetic preparation according to some embodiments can be produced by various conventionally known methods.

[0047] Liquid cosmetic preparations according to some embodiments can be produced, for example, by the following procedure. First, a composite pigment is added to water, a dispersant, and a chelating agent while stirring, and a dispersion treatment is carried out using a dispersing machine such as a ball mill, a bead mill, or a roll mill. Next, an emulsion of a film-forming agent is added, and a dispersion treatment is carried out using a stirrer or a dispersing machine (such as a ball mill, a bead mill, or a roll mill). In this manner, a liquid cosmetic preparation is obtained. Furthermore, in these preparation steps, the liquid cosmetic preparation can be stirred and dispersed by applying heat using the generated stirring and dispersion heat or a heater, or by cooling. Removal of bubbles using a defoamer or filtration of coarse particles using a filter may be carried out as needed. Each of these various mixing, stirring and dispersing, filtering, heating, and cooling steps may be carried out independently, or two or more steps may be carried out in parallel.

[0048] (Configuration of applicator) 1 is a longitudinal cross-sectional view of an applicator according to one embodiment. The applicator 100 is an applicator for applying the above-described liquid cosmetic to human skin or the like.

[0049] 1, an applicator 100 according to one embodiment includes a barrel 1, a liquid storage portion 2 housed inside the barrel 1, and a brush portion 6 (applicator portion) provided at the tip end in the longitudinal direction of the barrel 1. The applicator 100 also includes a relay core 4 and a tail plug 3, which are provided between the liquid storage portion 2 and the brush portion 6.

[0050] The barrel 1 may have a cylindrical or polygonal tube shape, etc. A reduced diameter section 1a is provided at the tip end of the barrel 1 in the longitudinal direction, where the inner diameter of the barrel 1 is smaller than the outer diameter of the liquid storage section 2, and this reduced diameter section 1a restricts the movement of the liquid storage section 2 towards the tip end. In addition, a tail plug 3 is inserted into the barrel 1 from the tail end opening of the barrel 1, and this tail plug 3 restricts the movement of the liquid storage section 2 towards the tail end.

[0051] The liquid storage section 2 is configured to store a liquid cosmetic. The liquid storage section 2 may include an occlusion body capable of absorbing and storing the liquid cosmetic. Alternatively, the liquid storage section 2 may include a tank capable of storing the liquid cosmetic.

[0052] The liquid cosmetic stored in the liquid storage portion 2 is supplied to the brush portion 6. In the exemplary embodiment shown in Fig. 1, the liquid cosmetic from the liquid storage portion 2 is supplied to the brush portion 6 via an intermediate core 4. The intermediate core 4 shown in Fig. 1 is provided inside the barrel 1 closer to the tip of the barrel 1 than the liquid storage portion 2, with one end thereof extending into the liquid storage portion 2 and the brush portion 6 attached to the other end. The positions of the intermediate core 4 and the brush portion 6 relative to the barrel 1 are fixed by a fixing tube 5 which is partially inserted into the barrel 1 from the tip side of the barrel 1 and fitted into the barrel 1.

[0053] With the liquid cosmetic supplied to the brush part 6, the liquid cosmetic can be applied to the skin by moving the brush part 6 relative to the skin while it is attached to the skin.

[0054] The brush part 6 may be formed from a brush material (brush bristles, fibers) containing a synthetic resin. The brush material may contain, for example, a synthetic resin such as a polyamide resin such as nylon, polypropylene terephthalate, or polybutylene terephthalate. [Example]

[0055] The present invention will be described in detail below with reference to examples.

[0056] (Preparation of liquid cosmetics) Liquid cosmetics of Examples 1 to 20 and Comparative Examples 1 to 9 were prepared with the compositions shown in Tables 1 to 3 below. The specific materials used for each liquid cosmetic shown in Tables 1 to 3 were as follows: The numerical value for the content of each component in Tables 1 to 3 indicates the ratio (% by mass) to the mass of the liquid cosmetic.

[0057] <Composite pigment> Composite pigment (1)... Lake pigment containing Red No. 226 and aluminum hydroxide in a weight ratio of approximately 1:1 to 3:7 (trade name: UNIPURE RED LC300, manufactured by SENSIENT), average particle size as shown in Tables 1 to 3 Composite pigment (2)... Lake pigment containing Red No. 226 and talc in a weight ratio of approximately 38:62 (trade name: C37-6332, manufactured by Sun Chemical Co., Ltd.), average particle size as shown in Tables 1 to 3

[0058] <Organic pigments> Red No. 202 (trade name: UNIPURE RED LC3079, manufactured by SENSIENT), average particle size as shown in Tables 1 to 3

[0059] <Chelating agent> gluconic acid

[0060] <Dispersant> Nonionic surfactant (trade name: NIKKOL BB-30, manufactured by Nikko Chemicals Co., Ltd.) Anionic surfactant (product name: Aquadew SPA-30B, manufactured by Ajinomoto Healthy Supply Co., Ltd.)

[0061] <Film-forming agent> Styrene / acrylates copolymer (product name: Daitosol 5000STY, manufactured by Daito Chemical Industry Co., Ltd., solids concentration: 50% aqueous dispersion)

[0062] <Preservatives> 1,3-butylene glycol (product name: High Sugar Cane, manufactured by Kokyu Alcohol Kogyo Co., Ltd.) Hexylene glycol (trade name: Arkema, manufactured by Arkema) 1,2-Pentanediol (trade name: Diol PD, manufactured by Kokyu Alcohol Kogyo Co., Ltd.) Ethylhexylglycerin (trade name: Saskin 50, manufactured by SACHEM) 2-Phenoxyethanol (trade name: PHENOXETOL, manufactured by Clariant)

[0063] <Solvent> Water: Ion-exchanged water

[0064] The average particle size of the composite pigment and pigment in each example and comparative example was adjusted by mechanically crushing the composite pigment or pigment product. The average particle size of the composite pigment and pigment was measured on a volume basis using a laser diffraction / scattering particle size distribution analyzer (LA-960) manufactured by Horiba, Ltd., after appropriate dilution with ion-exchanged water. The average particle size was calculated by multiplying the particle size obtained by measurement by the frequency percentage and then adding up the results.

[0065] (Evaluation method) The liquid cosmetics of each Example and Comparative Example were evaluated for viscosity over time and dispersion stability. The evaluation methods and evaluation criteria for each evaluation item are as follows. The evaluation results are shown in Tables 1 to 3.

[0066] <Viscosity over time> The liquid cosmetic compositions of each Example and Comparative Example were placed in glass tubes and left to stand for two weeks in an environment at 45°C. After rotating them for three minutes using an E-type viscometer manufactured by Toki Sangyo Co., Ltd. (EL rotor: standard 1° cone, 20 rpm, temperature 25°C), the viscosity (mPa s) was measured using the E-type viscometer. The viscosity was determined by multiplying the average viscosity measured multiple times by a conversion multiplier (0.3, set by Toki Sangyo Co., Ltd.) and dividing by a value calibrated using a solution specified in the viscosity calibration standard solution (JIS Z 8809). The resulting viscosities were evaluated according to the following evaluation criteria. [Evaluation criteria] A: The viscosity increase rate over time is less than 50% B: The viscosity increase rate over time is 50% or more. C: Immeasurable increase in viscosity after time

[0067] <Dispersion stability> The liquid cosmetic of each Example and Comparative Example was filled into the liquid storage portion of the applicator shown in Figure 1, and left to stand for 4 weeks in an environment of 45°C. After returning to room temperature, the applicator containing the sample was shaken up and down by hand 10 times with the application part facing downwards, and then writing was performed on paper. [Evaluation criteria] A: The sample in the applicator is stirred evenly when shaken 10 times and is discharged well. B: The sample in the applicator is uniformly mixed after shaking it 10 times, but it is difficult to dispense. C: The sample in the applicator is not stirred evenly even after shaking it 10 times, and a sediment layer remains, making it difficult to dispense. D: The sample in the applicator is not stirred or dispensed even after shaking it 10 times.

[0068] [Table 1] [Table 2] [Table 3]

[0069] (Evaluation results) In Examples 1 to 20, the evaluation results for viscosity over time were A to B, and the evaluation results for dispersion stability were A to C, all of which were good results. This is thought to be because the liquid cosmetics of Examples 1 to 20 contain a composite pigment containing a colorant and aluminum hydroxide, a chelating agent, and water, and the interaction between the aluminum hydroxide and colorant that constitute the composite pigment and the chelating agent was able to suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic.

[0070] In contrast, the dispersion stability evaluation results for Comparative Examples 1 to 3 were D, which were not good results. This is thought to be because the liquid cosmetics of Comparative Examples 1 to 3 did not contain a chelating agent, and therefore did not achieve a chelating effect on the colorant that constitutes the composite pigment in the liquid cosmetic, resulting in aggregation of the composite pigment.

[0071] Furthermore, when comparing Comparative Examples 1 and 3 with Comparative Example 2, Comparative Examples 1 and 3, in which the average particle size of the composite pigment was relatively small, received an evaluation result of C for viscosity over time, which is a poorer result. This indicates that if the average particle size of the composite pigment contained in the liquid cosmetic is relatively large, the liquid cosmetic does not increase in viscosity much over time, whereas if the average particle size of the composite pigment contained in the liquid cosmetic is small, the liquid cosmetic is more likely to increase in viscosity. In this regard, in Examples 1 to 20, even though the average particle size of the composite pigment was relatively small at 1.0 μm or less, it is believed that because a chelating agent was contained in the liquid cosmetic, the chelating action of the chelating agent on aluminum was able to suppress the thickening of the liquid cosmetic.

[0072] In Comparative Examples 6 and 7, the content of the chelating agent in the liquid cosmetic was less than 0.005 wt%, which is believed to have prevented the formation of an aluminum network structure or the aggregation of the composite pigment due to the interaction between the chelating agent and the aluminum hydroxide or colorant that constitutes the composite pigment. In Comparative Examples 4 and 5, the content of the chelating agent in the liquid cosmetic was more than 5.0 wt%, which is believed to have prevented the adverse effects that can arise from an excessive chelating agent content (e.g., deterioration of the dispersibility of the composite pigment due to the interaction between the chelating agent and components other than the composite pigment in the liquid cosmetic). In contrast, in Examples 1 to 20, the content of the chelating agent in the liquid cosmetic was between 0.005 wt% and 5.0 wt%, which is believed to have prevented the formation of an aluminum network structure and the aggregation of the composite pigment due to the appropriate interaction between the chelating agent and the aluminum hydroxide or colorant that constitutes the composite pigment. This is believed to have prevented the thickening of the liquid cosmetic and the deterioration of dispersibility.

[0073] As described above, the liquid cosmetics of Examples 1 to 20 can suppress thickening of the liquid cosmetics over time and aggregation of composite pigment particles in the liquid cosmetics, which is thought to prevent deterioration of dischargeability over time in an applicator to which the liquid cosmetics are applied.

[0074] The contents described in each of the above embodiments can be understood, for example, as follows.

[0075] [1] The liquid cosmetic according to at least one embodiment of the present invention comprises: a composite pigment comprising a colorant and aluminum hydroxide; A chelating agent; Water and Contains:

[0076] According to the above-mentioned configuration [1], the liquid cosmetic contains a composite pigment containing a colorant and aluminum hydroxide, a chelating agent, and water, and therefore, the interaction between the aluminum hydroxide and colorant constituting the composite pigment and the chelating agent can suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic. This is believed to be due to the following reasons. In other words, the aluminum hydroxide that constitutes the composite pigment exists in the form of a hydrate in a liquid cosmetic containing water, and when condensation between the hydrates occurs, a network structure of aluminum hydroxide is formed, which increases the viscosity of the liquid cosmetic and causes the network structure to aggregate while still incorporating the pigment, thereby worsening dispersibility. In this regard, in the above-mentioned configuration [1], the liquid cosmetic contains a chelating agent, and the interaction between the aluminum and the chelating agent inhibits condensation between the hydrates of aluminum hydroxide, thereby inhibiting the formation of the above-mentioned network structure and the resulting increase in viscosity and deterioration of dispersibility of the liquid cosmetic. Furthermore, since the surfaces of the colorants that make up the composite pigment contain functional groups that interact electrostatically with each other, it is believed that aggregation of composite pigment particles may occur in the liquid cosmetic. In this regard, in the configuration [1] above, since the liquid cosmetic contains a chelating agent, the interaction between the colorant and the chelating agent suppresses the electrostatic interaction between the functional groups of the composite pigment, which is thought to suppress aggregation of composite pigment particles in the liquid cosmetic and make it less likely that the dispersibility of the composite pigment particles will decrease. Therefore, the configuration of [1] above can suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic, thereby suppressing deterioration of the dischargeability over time in an applicator to which the liquid cosmetic is applied.

[0077] [2] In some embodiments, in the configuration of [1] above, The composite pigment has an average particle size of 1.0 μm or less.

[0078] The smaller the particle size of the composite pigment, the larger its surface area, and therefore the interaction between the composite pigment particles in the liquid cosmetic product is likely to form the above-mentioned network structure, which tends to thicken the liquid cosmetic product, or the composite pigment particles are likely to aggregate, which tends to deteriorate the dispersibility of the composite pigment in the liquid cosmetic product. In this regard, even in liquid cosmetic products containing a small composite pigment with an average particle size of 1.0 μm or less, as described in [2] above, the interaction between the aluminum hydroxide and colorant constituting the composite pigment and the chelating agent can suppress the thickening of the liquid cosmetic product over time and the aggregation of the composite pigment particles in the liquid cosmetic product, as described in [1] above. Therefore, deterioration of the discharge performance over time can be suppressed in an applicator to which the liquid cosmetic product is applied.

[0079] [3] In some embodiments, in the configuration of [1] or [2] above, The content of the chelating agent in the liquid cosmetic is 0.005% by weight or more and 5.0% by weight or less.

[0080] In the above-mentioned configuration [3], the content of the chelating agent in the liquid cosmetic is 0.005 wt% or more, and therefore the interaction between the chelating agent and the aluminum hydroxide and colorant that constitute the composite pigment can appropriately suppress the formation of the above-mentioned network structure and the aggregation of the composite pigment. Furthermore, in the above-mentioned configuration [3], the content of the chelating agent in the liquid cosmetic is 5.0 wt% or less, and therefore the adverse effects that can arise from an excessive content of the chelating agent (for example, deterioration of the dispersibility of the composite pigment due to the interaction between the chelating agent and components other than the composite pigment in the liquid cosmetic) can be suppressed. Therefore, the above-mentioned configuration [3] can more effectively suppress deterioration over time in the dischargeability of an applicator to which the liquid cosmetic is applied.

[0081] [4] In some embodiments, in any of the configurations [1] to [3] above, The chelating agent includes gluconic acid or citric acid. 4. The liquid cosmetic preparation according to claim 1.

[0082] According to the above-mentioned configuration [4], since the chelating agent contains gluconic acid or citric acid, it is easy to obtain an interaction between the chelating agent and the aluminum hydroxide and colorant that constitute the composite pigment, and therefore it is possible to more effectively prevent deterioration of the dischargeability over time in an applicator to which the liquid cosmetic is applied.

[0083] [5] At least one embodiment of the applicator of the present invention comprises: An application unit; A liquid storage section that stores the liquid cosmetic material according to any one of [1] to [4] above; Equipped with The liquid cosmetic is configured to be supplied from the liquid storage section to the application section.

[0084] According to the above-mentioned configuration [5], the liquid cosmetic contains a composite pigment containing a colorant and aluminum hydroxide, a chelating agent, and water, and therefore, the interaction between the aluminum hydroxide and colorant constituting the composite pigment and the chelating agent can suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic. This is thought to be due to the following reasons. In other words, the aluminum hydroxide that constitutes the composite pigment exists in the form of a hydrate in a liquid cosmetic containing water, and when condensation occurs between the hydrates, a network structure of aluminum hydroxide is formed, which is thought to increase the viscosity of the liquid cosmetic. In this regard, in the configuration [1] above, since the liquid cosmetic contains a chelating agent, the interaction between the aluminum and the chelating agent is thought to suppress condensation between the hydrates of aluminum hydroxide, thereby suppressing the formation of the above-mentioned network structure and the resulting increase in viscosity of the liquid cosmetic. Furthermore, since the surfaces of the colorants that make up the composite pigment contain functional groups that interact electrostatically with each other, it is believed that aggregation of composite pigment particles may occur in the liquid cosmetic. In this regard, in the configuration [1] above, since the liquid cosmetic contains a chelating agent, the interaction between the colorant and the chelating agent suppresses the electrostatic interaction between the functional groups of the composite pigment, which is thought to suppress aggregation of composite pigment particles in the liquid cosmetic and make it less likely that the dispersibility of the composite pigment particles will decrease. Therefore, the configuration of [5] above can suppress thickening of the liquid cosmetic over time and aggregation of composite pigment particles in the liquid cosmetic, thereby suppressing deterioration of the dischargeability over time in an applicator to which the liquid cosmetic is applied.

[0085] The above describes an embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and also includes forms in which the above-described embodiment is modified, or forms in which these forms are appropriately combined.

[0086] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components. [Explanation of symbols]

[0087] 1 shaft cylinder 1a Reduced diameter part 2 Liquid storage section 3 tail plug 4 relay core 5 Fixed tube 6 Brush section 100 applicators

Claims

1. a composite pigment comprising a colorant and aluminum hydroxide; A chelating agent; Water and A liquid cosmetic comprising:

2. The composite pigment has an average particle size of 1.0 μm or less. The liquid cosmetic according to claim 1.

3. The content of the chelating agent in the liquid cosmetic is 0.005% by weight or more and 5.0% by weight or less. The liquid cosmetic according to claim 2.

4. The chelating agent includes gluconic acid or citric acid. The liquid cosmetic preparation according to any one of claims 1 to 3.

5. An application unit; a liquid storage section that stores the liquid cosmetic material according to any one of claims 1 to 3; Equipped with The liquid cosmetic is supplied from the liquid storage section to the application section. Applicator.

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