Molded body

Abstract

To provide a molded article having excellent percarbonate stability.SOLUTION: Provided is a molded article comprising (A) a substance with a weight change rate of water absorption of less than 106, (B) a substance with a water absorption rate of weight change of 106 or more, and (C) a percarbonate. This makes it possible to provide a molded article having excellent percarbonate stability, molded article solubility, and molded article moldability. In the molded article, (A) is preferably at least one selected from the group consisting of cellulose, cellulose derivatives, and sugar alcohols, and (B) is preferably at least one selected from starches.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a molded article, and more particularly to a molded article for use in the field of cosmetics. [Background technology]

[0002] Oxidative hair dyes are known as cosmetics for dyeing human hair. When applied to hair, the oxidative dye penetrates the hair and then undergoes oxidative polymerization inside the hair, resulting in color development. Oxidative hair dyes form oxidative dye polymers, which makes it easier for the dye to remain inside the hair, and the colored state is maintained for a longer period of time than temporary hair dyes (hair colorants).

[0003] Bleaching and decolorizing agents are also known as cosmetics for bleaching and decolorizing human hair, etc. Bleaching and decolorizing agents use an oxidizing agent as an active ingredient, which decomposes the melanin pigment inside the hair and the dye that has been fixed in the hair during hair dyeing, thereby achieving a bleaching and decolorizing effect.

[0004] Hair dyes and bleaching / decoloring agents containing an oxidizing agent may be in the form of solid, liquid, aerosol, etc. For example, Patent Document 1 discloses a solid-shaped molded product containing a carrier, a dissolution promoter, and an oxidative dye precursor. Patent Document 2 also discloses a multi-tablet hair dye having an inactive substance in the intermediate layer between the hair dye component and the oxidizing agent. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2005-526737 [Patent Document 2] Special Publication No. 46-4280 Summary of the Invention [Problem to be solved by the invention]

[0006] Hair dyes and bleaching / decoloring agents in the form of molded products not only have high storage stability of the ingredients but also have good transport efficiency. However, these molded products have the problem that their solubility in water decreases when they are formulated to impart the thickening properties necessary for application to hair and to improve fluidity and moldability during tableting. Furthermore, the present inventors have found that the stability of percarbonate decreases when molded into a molded product. Therefore, there is a need for the development of molded products for use in hair dyes and bleaching / decoloring that have excellent moldability and solubility and improved percarbonate stability. Therefore, an object of the present invention is to provide a molded product which is excellent in moldability and solubility and has improved stability of percarbonate. [Means for solving the problem]

[0007] As a result of extensive research into the above-mentioned problems, the present inventors have discovered that by blending (A) a substance having a water absorbency of less than 106 in terms of weight change rate, (B) a substance having a water absorbency of 106 or more in terms of weight change rate, and (C) a percarbonate, a molded product having excellent stability of the percarbonate can be obtained, and have completed the present invention.

[0008] That is, the present invention provides the following [1] to [4]. [1] A molded article containing the following components (A) to (C): (A) a substance having a water absorption rate of less than 106 in terms of weight change, (B) a substance having a water absorption rate of 106 or more in terms of weight change, and (C) a percarbonate. This molded product can exhibit the effects of improving the stability of component (C), the solubility of the molded product in water, and the moldability of the molded product due to the actions of components (A) and (B). [2] The molded article according to [1], wherein the ratio (A) / (C) of the content of the component (A) to the content of the component (C) is 0.1 to 4.00. According to this feature, by controlling the content ratio of the component (A) and the component (C) in the molded product, it is possible to further exert the effects of improving the stability of the component (C) and the moldability of the molded product. [3] The molded article according to [1] or [2], wherein the ratio (B) / (C) of the content of the component (B) to the content of the component (C) is 0.1 to 4.00. According to this feature, by controlling the content ratio of the component (B) and the component (C) contained in the molded product, it is possible to further exert the effects of improving the stability of the component (C) and the solubility of the molded product in water. [4] The molded article according to any one of [1] to [3], wherein the ratio ((A) + (B)) / (C) of the sum of the contents of the component (A) and the component (B) to the content of the component (C) is 0.3 to 8.0. According to this feature, by controlling the amounts of the components (A), (B), and (C) contained in the molded product, it is possible to further exert the effects of improving the stability of the component (C), the solubility of the molded product in water, and the moldability of the molded product. [Effects of the Invention]

[0009] According to the present invention, by blending (A) a substance having a water absorption rate of less than 106 in terms of weight change and (B) a substance having a water absorption rate of 106 or more in terms of weight change into a molded body, it is possible to provide (C) a molded body having excellent percarbonate stability, molded body solubility, and moldability. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the molded article according to the present invention will be described in detail. The molded articles described in the embodiments are merely examples for explaining the molded article according to the present invention, and the present invention is not limited to these examples.

[0011] The molded body of the present invention is a solid body molded into a desired shape, and the shape is not particularly limited, but examples thereof include a disk, a cylinder, a prism, a sphere, etc. The method for producing the molded product of the present invention is not particularly limited, and the molded product can be produced, for example, by directly tableting the mixed components and additives, or by mixing the granulated components and additives and tableting them. Granular particles can also be produced using a pan granulator or a tumbling granulator. Furthermore, flakes can be formed using a compression molding machine such as a roller compactor. From the viewpoint of improving the strength and productivity of the molded product, a tableted product formed by tableting is preferred.

[0012] The molded article of the present invention is used as a hair dye or bleach / decolorizing agent by dissolving it in an aqueous solution such as water, and contains (A) a substance having a water absorbency of less than 106 in terms of weight change, (B) a substance having a water absorbency of 106 or more in terms of weight change, and (C) a percarbonate. By blending components (A) and (B) into the molded article, it is possible to achieve the effects of improving the stability of component (C), the percarbonate, the solubility of the molded article in an aqueous solution, and the moldability of the molded article.

[0013] The water absorbency used in this specification is measured by taking a predetermined amount of an initial sample, leaving it to stand at a temperature of 30°C and a relative humidity of 80%, measuring the mass of the sample after absorbing moisture 24 hours later, and dividing the weight of the sample after absorbing moisture by the weight of the initial sample (weight change rate).

[0014] The shape of the molded product is not particularly limited, and examples thereof include circular tablets, oval tablets, flower-shaped tablets, etc. Furthermore, the molded product may be provided with one or more scoring lines for dividing into two or four pieces, etc., as needed. The size of the molded body is not particularly limited, and may be, for example, 5 mm or more and 50 mm or less in diameter. The lower limit is more preferably 10 mm or more, even more preferably 15 mm or more, and particularly preferably 20 mm or more. On the other hand, the upper limit is more preferably 40 mm or less, even more preferably 35 mm or less, and particularly preferably 30 mm or less. The thickness of the molded article is not particularly limited and is, for example, 1.0 mm or more and 20.0 mm or less. The lower limit is more preferably 2.0 mm or more, even more preferably 2.5 mm or more, and particularly preferably 3.0 mm or more. On the other hand, the upper limit is more preferably 15.0 mm or less, even more preferably 12.0 mm or less, and particularly preferably 10.0 mm or less. By setting the size and thickness of the molded product within the above ranges, the size becomes such that it is easy to adjust the amount when used as a hair dye or bleach / decolorizing agent, making it easy to reduce the amount of unused agent after hair treatment or to add agent during hair treatment. Furthermore, by making the size of the molded article 20.0 mm or more, it is possible to prevent accidental ingestion by children, the elderly, and the like.

[0015] Next, a method for producing the molded body will be described. The molded body can be produced by a conventional method used in the technical fields of cosmetics, quasi-drugs, pharmaceuticals, etc. In the process for producing the molded body, the mixed components and additives may be directly compressed into tablets, or the granulated components and additives may be mixed and then compressed into tablets. The granulation method is not particularly limited, and examples thereof include dry granulation, fluidized bed granulation, tumbling granulation, stirring granulation, and spray granulation. The mixer used in the mixing step is not particularly limited, and examples thereof include a tumbler mixer, a V-type mixer, a double cone mixer, and an infinite mixer. The tablet press used in the tableting step is not particularly limited, and examples thereof include a single punch tablet press and a rotary tablet press.

[0016] Next, the components contained in the molded article of the present invention will be described in detail. <(A) Substances with a water absorption rate of less than 106> The substance (A) having a water absorption rate of less than 106 improves the stability of the percarbonate contained in the molded body and the moldability of the molded body. From the viewpoint of improving moldability, the lower limit is preferably 100 or more, more preferably 105 or more. Such substances are not particularly limited as long as they have a water absorbency of less than 106 and are acceptable for use in foods, cosmetics, quasi-drugs, pharmaceuticals, etc., and examples thereof include cellulose, cellulose derivatives, and sugar alcohols. Cellulose and cellulose derivatives are polymeric compounds having a structure in which a large number of β-glucose units are polymerized in a linear chain via glycosidic bonds, and are not particularly limited as long as they are acceptable for use in foods, cosmetics, quasi-drugs, pharmaceuticals, and the like. Specific examples of cellulose and cellulose derivatives include crystalline cellulose, low-substituted hydroxypropyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and croscarmellose. The sugar alcohol is a sugar in which the carbonyl group of an aldose or ketose has been reduced, and is not particularly limited as long as it is acceptable for use in foods, cosmetics, quasi-drugs, pharmaceuticals, and the like. Specific examples of sugar alcohols include mannitol, sorbitol, maltitol, xylitol, erythritol, lactitol, and glycerin. From the viewpoint of improving the stability of the percarbonate and the moldability of the molded article, preferred components (A) are mannitol and crystalline cellulose, and more preferred is crystalline cellulose. These components (A) may be blended alone or in combination of two or more.

[0017] The content of component (A) is not particularly limited, and is, for example, 0.5% by mass or more and 50.0% by mass or less relative to the mass of the molded article. The lower limit is more preferably 1.0% by mass or more, even more preferably 5.0% by mass or more, particularly preferably 10.0% by mass or more, and most preferably 12.0% by mass or more. On the other hand, the upper limit is more preferably 45.0% by mass or less, even more preferably 43.0% by mass or less, and particularly preferably 40.0% by mass or less. By ensuring that the content of component (A) in the molded article falls within the above range, it is possible to obtain a molded article with improved moldability.

[0018] <(B) Substances with a water absorption rate of 106 or more> The substance (B) having a water absorbency of 106 or more improves the stability of the percarbonate contained in the molded body and the solubility of the molded body. From the viewpoint of improving solubility, the lower limit is preferably 107 or more, more preferably 112 or more. The upper limit is preferably 120 or less, more preferably 115 or less. Such substances are not particularly limited as long as they have a water absorbency of 106 or more and are acceptable for use in foods, cosmetics, quasi-drugs, pharmaceuticals, etc., and examples thereof include starches. Starches are polymeric compounds having a structure in which many α-glucose molecules are polymerized through glycosidic bonds, and are not particularly limited as long as they are acceptable for use in foods, cosmetics, quasi-drugs, pharmaceuticals, etc. Specific examples of starches include starch acetate, oxidized starch, potato starch, corn starch (cornstarch), rice starch, wheat starch, sweet potato starch, tapioca starch, hydroxypropylated phosphate cross-linked starch, acetylated adipate cross-linked starch, acetylated phosphate cross-linked starch, acetylated oxidized starch, sodium octenylsuccinate starch, hydroxypropyl starch, phosphate monoesterified phosphate cross-linked starch, phosphorylated starch, and D-glucose. From the viewpoint of improving the stability of the percarbonate and the solubility of the molded body, preferred components (B) are starch acetate, potato starch, hydroxypropylated phosphate cross-linked starch, corn starch, rice starch, and D-glucose, more preferably starch acetate and potato starch, and even more preferably starch acetate. These components (B) may be blended alone or in combination of two or more.

[0019] The content of component (B) is not particularly limited, and is, for example, 0.5% by mass or more and 50.0% by mass or less relative to the mass of the molded article. The lower limit is more preferably 1.0% by mass or more, even more preferably 5.0% by mass or more, particularly preferably 10.0% by mass or more, and most preferably 13.0% by mass or more. On the other hand, the upper limit is more preferably 45.0% by mass or less, even more preferably 43.0% by mass or less, and particularly preferably 40.0% by mass or less. By setting the content of component (B) in the molded product within the above range, it is possible to obtain a molded product with improved stability of the percarbonate and improved solubility of the molded product.

[0020] <(C) Percarbonate> The percarbonate, which is the component (C), has the effect of oxidizing the oxidation dye to cause it to develop color, and also has the effect of breaking down the melanin inside the hair. The percarbonate generates hydrogen peroxide when dissolved in water, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, and the like. Specific examples of percarbonates include sodium percarbonate, potassium percarbonate, calcium percarbonate, magnesium percarbonate, and ammonium percarbonate. The preferred component (C) is sodium percarbonate or potassium percarbonate from the viewpoint of improving hair dyeing properties and bleaching / decoloring actions. These percarbonates may be blended alone or in combination of two or more.

[0021] The content of percarbonate is not particularly limited, and is, for example, 5% by mass or more and 40% by mass or less relative to the mass of the molded body. The lower limit is more preferably 7% by mass or more, even more preferably 9% by mass or more, and particularly preferably 10% by mass or more. On the other hand, the upper limit is more preferably 38% by mass or less, even more preferably 36% by mass or less, and particularly preferably 35% by mass or less. By setting the content of percarbonate in the molded product within the above range, it is possible to obtain a molded product with improved hair dyeing properties and bleaching / decolorizing effects.

[0022] The ratio (A) / (C) of the content of component (A) to the content of component (C) in the molded article is not particularly limited and is, for example, 0.01 or more and 5.0 or less. The lower limit is more preferably 0.1 or more, even more preferably 0.3 or more, particularly preferably 0.5 or more, and most preferably 1.0 or more. On the other hand, the upper limit is more preferably 4.5 or less, even more preferably 4.0 or less. By setting the ratio (A) / (C) of the content of the component (A) to the content of the component (C) in the molded product within the above range, the stability of the percarbonate and the moldability of the molded product can be further improved.

[0023] The ratio (B) / (C) of the content of component (B) to the content of component (C) in the molded article is not particularly limited and is, for example, 0.01 or more and 5.0 or less. The lower limit is more preferably 0.1 or more, even more preferably 0.3 or more, particularly preferably 0.5 or more, and most preferably 1.0 or more. On the other hand, the upper limit is more preferably 4.5 or less, even more preferably 4.0 or less. By setting the ratio (B) / (C) of the content of the component (B) to the content of the component (C) in the molded product within the above range, the stability of the percarbonate and the solubility of the molded product can be further improved.

[0024] The ratio ((A) + (B)) / (C), which is the ratio of the sum of the contents of components (A) and (B) to the content of component (C) in the molded article, is not particularly limited and is, for example, 0.05 or more and 9.0 or less. The lower limit is more preferably 0.3 or more, even more preferably 0.5 or more, particularly preferably 1.0 or more, and most preferably 2.0 or more. On the other hand, the upper limit is more preferably 8.5 or less, even more preferably 8.0 or less. By setting the ratio ((A) + (B)) / (C) of the sum of the contents of the components (A) and (B) to the content of the component (C) in the molded product within the above range, the stability of the percarbonate, the solubility of the molded product, and the moldability of the molded product can be further improved.

[0025] <Other ingredients> The molded article of the present invention may contain other components, if necessary, in addition to the above components (A) to (C). Specific examples of the added components include (D) oxidation dyes, (E) lubricants, (F) thickeners, chelating agents, hydrogen peroxide stabilizers, pH adjusters, excipients, binders, disintegrants, stabilizers, preservatives, flavors, direct dyes, and colorants.

[0026] (oxidation dyes) Oxidation dyes, which are component (D), are dyes that develop color through oxidative polymerization in the presence of an oxidizing agent. Oxidation dyes include dye intermediates and couplers. Dye intermediates are substances that develop color through their own oxidation, and couplers are substances that can produce various colors when combined with dye intermediates. Examples of dye intermediates include p-phenylenediamine, toluene-2,5-diamine (paratoluylenediamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, and salts thereof. One or more of these dye intermediates can be selected and used. The coupler develops color by bonding with a dye intermediate. Examples of couplers include resorcinol, 5-amino-o-cresol, m-aminophenol, α-naphthol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m-aminophenol, phenylmethylpyrazolone, 1,5-dihydroxynaphthalene, and salts thereof. Examples of 2,4-diaminophenoxyethanol include 2,4-diaminophenoxyethanol hydrochloride. One or more of these couplers can be selected and used. Furthermore, oxidation dyes listed in the "Standards for Quasi-Drug Raw Materials" (published June 2006 by Yakuji Nipposha) may be appropriately incorporated. The content of the oxidation dye in the solution obtained after dissolving the molded body in water or the like is not particularly limited, but can be, for example, in the range of 0.01 to 10 mass %, preferably in the range of 0.1 to 7 mass %, and more preferably in the range of 0.5 to 5 mass %.

[0027] (lubricant) The lubricant, component (E), reduces the adhesive force of the powder components and increases their fluidity. There are no particular limitations on the lubricant, as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, foods, etc. Examples include phyllosilicate mineral powder, silicon oxide, saturated fatty acids, esters, waxes, hydrogenated vegetable oils, fats, polyethers, etc. Specific examples of lubricants include talc, light anhydrous silicic acid, magnesium stearate, calcium stearate, sucrose fatty acid esters, magnesium carbonate, sodium benzoate, palmitic acid, sodium stearyl fumarate, beeswax, hardened soybean oil, cacao butter, polyethylene glycol, etc. These lubricants may be blended alone or in combination of two or more. Addition of a lubricant can prevent tableting problems such as sticking during the production of compacts. The content of the lubricant is not particularly limited and is, for example, 0.1% by mass or more and 5.0% by mass or less relative to the mass of the compact.

[0028] (thickener) The thickener as component (F) is not particularly limited as long as it has solubility in water and viscosity and is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, foods, etc. Examples include polysaccharides and water-soluble acrylic acid polymers. Specific examples of thickeners include xanthan gum, sodium alginate, guar gum, cationized guar gum such as O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride, carboxyvinyl polymer, carrageenan, gellan gum, pectin, gum arabic, and roasted bean gum. These thickeners may be used alone or in combination of two or more. The viscosity of the thickener can be measured by the capillary viscometer method described in the 17th Edition of the Japanese Pharmacopoeia. The addition of a thickener can improve the moldability of the molded body and impart viscosity to the aqueous solution that the molded body is dissolved in. The content of the thickener is not particularly limited, and is, for example, 0.1% by mass or more and 20.0% by mass or less relative to the mass of the molded body.

[0029] (chelating agent) The chelating agent is not particularly limited as long as it is an agent that inactivates metal ions and is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, and the like, and examples thereof include those that have a ligand and bind to metal ions. Specific examples of chelating agents include ethylenediaminetetraacetic acid (EDTA, edetic acid), hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethanediphosphonic acid (HEDP, etidronic acid) and its salts, etc. These chelating agents may be used alone or in combination of two or more. The addition of a chelating agent can improve the solubility of the molded body.

[0030] (pH adjuster) The pH adjuster adjusts the pH of the composition and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the pH adjuster include inorganic acids, organic acids, inorganic alkalis, and organic alkalis.

[0031] Specific examples of organic acids include hydroxycarboxylic acids such as glycolic acid, lactic acid, malic acid, citric acid, and tartaric acid, and dicarboxylic acids such as succinic acid. Specific examples of organic alkalis include volatile alkali components such as morpholine, alkanolamines such as monoethanolamine, aminoalcohols such as 2-amino-2-methyl-1-propanol, basic amino acids such as L-arginine, L-lysine, L-histidine, etc. These pH adjusters may be blended alone or in combination of two or more. By adding a pH adjuster, when the molded article is used as a hair dye or bleach / decolorizing agent, the hair dyeing properties, bleaching / decolorizing action, and safety can be improved.

[0032] (excipient) The excipient adjusts the bulk of the molded body and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, foods, etc. Examples of the excipient include sugars, phosphates, sulfates, etc. Specific examples of excipients include lactose, sucrose, glucose, calcium phosphate, calcium sulfate, etc. These excipients may be blended alone or in combination of two or more. By adding an excipient, the size of the compact can be adjusted.

[0033] (binder) The binder enhances the binding strength of the powder components and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the binder include synthetic resins, sugars, polyethers, waxes, etc. Specific examples of binders include polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, glucose, maltose, lactose, sucrose, dextrin, polyethylene glycol, paraffin, gelatin, agar, pullulan, etc. These binders may be blended alone or in combination of two or more. By adding a binder, it is possible to impart binding strength to the powder components and produce a stable compact.

[0034] (disintegrant) The disintegrant is a substance that disintegrates tablets, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, foods, etc. Examples include sugars and synthetic resins. Specific examples of disintegrants include sucrose, dextrin, polyvinylpyrrolidone, etc. These disintegrants may be used alone or in combination of two or more. By adding a disintegrant, it is possible to promote disintegration of the compact and improve the solubility in aqueous solutions such as water.

[0035] (stabilizer) The stabilizer suppresses chemical and physical decomposition of the active ingredient, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the stabilizer include inorganic compounds, organic acids, organic acid salts, and vitamins. Specific examples of stabilizers include sodium hydrogen sulfite, ascorbic acid, sodium edetate, tocopherol, etc. These stabilizers may be used alone or in combination of two or more. By adding a stabilizer, it is possible to prevent the active ingredient contained in the molded product from being deactivated.

[0036] (preservative) The preservative is an agent that inhibits the growth of microorganisms and the like, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the preservative include benzoates and parahydroxybenzoic acid esters. Specific examples of preservatives include sodium benzoate, propyl parahydroxybenzoate, methylparaben, propylparaben, etc. These preservatives may be used alone or in combination of two or more. By adding a preservative, the molded article can be prevented from being contaminated by microorganisms.

[0037] (fragrance) The fragrance improves the olfactory sensory sensation of the molded body, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the fragrance include esters, alcohols, aldehydes, ketones, acetals, phenols, ethers, lactones, furans, and natural products. Specific examples of fragrances include lavender oil, orange oil, lemon oil, rose oil, spearmint oil, peppermint oil, cinnamon oil, fruit essence, benzaldehyde, neral, decanal, tolylaldehyde, 2-dodenal, geraniol, terpineol, hydroxycitronellal, nerol, nonanal, acetylcedrene, undecanal, eugenol, geraniol, jasmine lactone, citral, damascone, damascenone, γ-terpinene, vanillin, aldehyde C-8, aldehyde C-9, aldehyde C-12, 2,6-dimethyloctanal, etc. These fragrances may be blended alone or in combination of two or more. By adding a flavoring agent, the molded product can be given a fragrance, thereby increasing its palatability.

[0038] (direct dye) The direct dye is a dye that adheres to or penetrates into hair to dye it, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes, disperse dyes, etc. These direct dyes may be blended alone or in combination of two or more. Specific examples of basic dyes include Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 47, Basic Blue 75, Basic Blue 99, Basic Blue 124, Basic Brown 4, Basic Brown 16, Basic Brown 17, Basic Green 1, Basic Green 4, Basic Orange 1, Basic Orange 2, Basic Orange 31, Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 46, Basic Red 51, Basic Red 76, Basic Red 118, Basic Violet 1, Basic Violet 3, Basic Violet 4, Basic Violet 10, Basic Violet 11:1, Basic Violet 14, Basic Violet 16, Basic Yellow 11, Basic Yellow 28, Basic Yellow 57, and Basic Yellow 87. Specific examples of natural dyes include gardenia dye, turmeric dye, annatto dye, sodium copper chlorophyllin, paprika dye, lac dye, and henna. Specific examples of nitro dyes include 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picramic acid, picric acid, and salts thereof. Specific examples of HC dyes include HC Blue No. 2, HC Blue No. 5, HC Blue No. 6, HC Blue No. 9, HC Blue No. 10, HC Blue No. 11, HC Blue No. 12, HC Blue No. 13, HC Orange No. 1, HC Orange No. 2, HC Orange No. 3, HC Red No. 1, HC Red No. 3, HC Red No. 7, HC Red No. 10, HC Red No. 11, HC Red No. 13, HC Red No. 14, HC Violet No. 1, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 4, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 9, HC Yellow No. 10, HC Yellow No. 11, HC Yellow No. 12, HC Yellow No. 13, HC Yellow No. 14, and HC Yellow No. 15. Specific examples of disperse dyes include Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Blue 7, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, and Disperse Violet 15. By adding a direct dye, the dyeability of the molded article can be improved.

[0039] (coloring agent) The colorant is used to improve the palatability and distinguishability of the molded body, and is not particularly limited as long as it is acceptable for use in cosmetics, quasi-drugs, pharmaceuticals, etc. Examples of the colorant include natural pigments and synthetic pigments. Specific examples of coloring agents include cochineal, carmine, curcumin, riboflavin, annatto, titanium oxide, yellow ferric oxide, ferric oxide, talc, calcined silica, magnesium carbonate, and synthetic food colorings such as Food Blue No. 1, Food Blue No. 2, Food Yellow No. 4, Food Yellow No. 5, Food Green No. 3, Food Red No. 2, Food Red No. 3, Food Red No. 102, Food Red No. 104, Food Red No. 105, and Food Red No. 106. These coloring agents may be blended alone or in combination of two or more. By adding a colorant, the molded product can be colored to enhance its palatability and distinctiveness.

[0040] Other additives include solubilizing agents, surfactants, plasticizers, emulsifiers, glossing agents, foaming agents, moisture-proofing agents, preservatives, fluidizing agents, flavoring agents, fragrances, disintegration aids, ultraviolet absorbers, etc. These additives may be blended alone or in combination of two or more.

[0041] Due to the above-mentioned characteristics, the molded product of the present invention can exhibit the effects of improving the stability of the percarbonate, the solubility of the molded product, and the moldability of the molded product. [Example]

[0042] The present invention will be specifically described below with reference to examples, but the technical scope of the present invention is not limited to these examples.

[0043] (Composition of each agent) Powder hair dye compositions and molded products (tablets) containing the components shown in Tables 1 to 6 were prepared. The molded products were tableted with a particle weight of 2 g, a diameter of 20 mm, and a pressure of 20 KN. The numerical values ​​in the columns showing each component in each table indicate the content of the component in that column, and are expressed in units of mass %. The notations "(A)" to "(F)" in the tables indicate compounds corresponding to the components (A) to (F) described in the claims and specification of this application. Table 1 also shows the measurement results for the water absorption of the components (A) and (B) used in the experiments.

[0044] (Water absorption measurement) The water absorbency was measured by measuring the mass of the sample after moisture absorption 24 hours after leaving it at a temperature of 30°C and a relative humidity of 80%. The weight of the sample after moisture absorption was divided by the weight of the initial sample to calculate the weight change rate. The water absorbency of components (A) and (B) is shown in Table 1.

[0045] [Table 1]

[0046] (Stability evaluation against sodium percarbonate) The stability of sodium percarbonate was evaluated based on the degree of change in the color tone of the dyed hair before and after storage. 2 g of the powder hair dye composition of each Example and Comparative Example and 10 mL of water were placed in a 100 mL mixing container and mixed using a stirring rod to prepare a hair dye application solution. 3 g of the resulting hair dye application solution was applied to 1 g of white hair using a brush, and the hair was dyed by leaving it for 40 minutes after application. The dyed hair strand was rinsed with water and shampooed to remove the hair dye application solution, treated with conditioner, wiped dry with a towel, and dried with a hair dryer.

[0047] (Evaluation of the effect of inhibiting changes in dyed hair color) The powder hair dye composition of each example was stored in a thermostatic chamber at 50°C and 80% humidity for 60 days. Using the powder composition of each example that had been stored for the specified period, hair was dyed using the hair dyeing method described above to obtain each hair tress. Additionally, hair tresses were also prepared by dyeing the powder hair dye composition of each example that had not been subjected to the preservation treatment in the same manner as above, and used as controls. For each of the resulting hair strands, 10 panelists visually observed under a standard light source whether or not there was any change in the dyed color tone (brightness and saturation) due to the preservation treatment, and evaluated according to the following criteria.

[0048] (Evaluation criteria) The results were scored on a five-point scale: almost no change in dyed hair color (5 points), slight change in dyed hair color (4 points), slight change in dyed hair color (3 points), change in dyed hair color (2 points), and major change in dyed hair color (1 point). Next, the average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 points or more was designated as "excellent: 5", an average score of 3.6 points or more but less than 4.6 points was designated as "good: 4", an average score of 2.6 points or more but less than 3.6 points was designated as "fair: 3", an average score of 1.6 points or more but less than 2.6 points was designated as "slightly poor: 2", and an average score of 1.0 points or more but less than 1.6 points was designated as "poor: 1".

[0049] (Evaluation of solubility in water) The solubility test of the molded product was carried out by placing one molded product in 10 mL of water, leaving it to stand for 3 seconds, and then visually checking the solubility when stirred with a brush. The solubility of the molded product was evaluated as follows: if it dissolved within 5 seconds, it was given a rating of "5"; if it dissolved in 5 to 10 seconds, it was given a rating of "4"; if it dissolved in 10 to 20 seconds, it was given a rating of "3"; if it dissolved in 20 to 30 seconds, it was given a rating of "2"; and if it dissolved in 30 seconds or more, it was given a rating of "1".

[0050] (Evaluation of moldability of molded body) The moldability test of the molded body was carried out by visually checking the state of the prepared sample. The moldability of the compact was evaluated as follows: if the sample surface was completely free of chips, it was rated as "5"; if there was one small chip on the sample surface, it was rated as "4"; if there were multiple small chips on the sample surface, it was rated as "3"; if there were one or multiple large chips on the sample surface, it was rated as "2"; and if the powder remained and could not be molded into a compact, it was rated as "1".

[0051] [Table 2]

[0052] As shown in Table 2, when Examples 1 and 2 are compared with Comparative Examples 1 to 3, Examples 1 and 2, which contain components (A) and (B), have scores of 4 or higher for stability, solubility, and moldability, while Comparative Examples 1 to 3, which do not contain either or both of components (A) and (B), have scores of 1 for stability, solubility, and moldability. Therefore, it was shown that by blending component (A) and component (B) into the molded body, the stability of the percarbonate contained in the molded body, the solubility of the molded body, and the moldability of the molded body are all improved.

[0053] [Table 3]

[0054] As shown in Table 3, when Examples 1, 3 to 8 are compared, the stability evaluation, solubility evaluation, and moldability evaluation were all 3 or higher in Examples 1, 3 to 8, which contain a substance with a water absorption rate of 106 or more as component (B). Therefore, it was shown that by using a substance with a water absorption rate of less than 106 in terms of weight change as component (A) to be blended into the molded body and a substance with a water absorption rate of 106 or more in terms of weight change as component (B), the stability of the percarbonate contained in the molded body, the solubility of the molded body, and the moldability of the molded body are all improved.

[0055] [Table 4]

[0056] As shown in Table 4, when Examples 9 to 12 are compared, when the ratio (A) / (C) of the content of component (A) to the content of component (C) is 0.061 or more, the stability evaluation, solubility evaluation, and moldability evaluation were all 3 or more. Furthermore, when (A) / (C) is 0.061 or more, the stability evaluation and moldability evaluation increased as the ratio increased. Therefore, it was shown that when the (A) / (C) ratio in the molded body is in the range of 0.061 to 4.0, the stability of the percarbonate contained in the molded body and the moldability of the molded body are further improved.

[0057] [Table 5]

[0058] As shown in Table 5, comparing Examples 13 to 16, when the ratio (B) / (C) of the content of component (B) to the content of component (C) was 0.061 or more, the stability evaluation, solubility evaluation, and moldability evaluation were all 3 or more. Furthermore, when (B) / (C) was 0.061 or more, the stability evaluation and solubility evaluation increased as the ratio increased. Therefore, it was shown that when the (B) / (C) ratio in the molded body is in the range of 0.061 to 4.0, the stability of the percarbonate contained in the molded body and the solubility of the molded body are further improved.

[0059] [Table 6]

[0060] As shown in Table 6, when Examples 17 to 20 are compared, when the ratio ((A) + (B)) / (C) of the sum of the contents of components (A) and (B) to the content of component (C) is 0.286 or higher, the stability evaluation, solubility evaluation, and moldability evaluation all achieved scores of 3 or higher. Furthermore, when ((A) + (B)) / (C) is 0.286 or higher, the stability evaluation, solubility evaluation, and moldability evaluation increased as the ratio increased. Therefore, it was shown that when ((A) + (B)) / (C) in the molded body is in the range of 0.286 to 8.0, the stability of the percarbonate contained in the molded body, the solubility of the molded body, and the moldability of the molded body are further improved.

[0061] From the above results, it became clear that by blending a molded body containing percarbonate (component (C)) with a substance (component (A)) whose water absorbency is less than 106 in terms of weight change rate and a substance (B) whose water absorbency is 106 or more in terms of weight change rate, the stability of the percarbonate, the solubility of the molded body, and the moldability of the molded body are all improved. [Industrial Applicability]

[0062] The present invention can provide a molded product having improved stability of the percarbonate, improved solubility in water of the molded product, and improved moldability of the molded product. The formed article of the present invention can be used to dye, bleach, or decolorize human body hair, such as hair, beard, eyebrows, and leg hair, and may also be used to dye, bleach, or decolorize animal hair, such as pet hair. The molded article of the present invention can also be used for coloring in beauty salons, barber shops, etc., or for self-coloring.

Claims

1. A molded article containing the following components (A) to (C): The component (A) is at least one selected from cellulose, crystalline cellulose, and sugar alcohol, The component (B) is at least one selected from starch and D-glucose, The component (C) is a percarbonate, The content of the component (C) is 5% by mass or more and 40% by mass or less relative to the mass of the molded body, A molded article characterized in that the ratio (B) / (C) of the content of the component (B) to the content of the component (C) is 1.0 to 4.

5.

2. 2. The molded article according to claim 1, wherein the ratio (A) / (C) of the content of the component (A) to the content of the component (C) is 0.1 to 4.

5.

3. 3. The molded article according to claim 1, wherein the ratio ((A) + (B)) / (C) of the sum of the contents of the component (A) and the component (B) to the content of the component (C) is 2.0 to 8.5.

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