denture cleanser

Abstract

To provide a denture cleaning agent that enhances a cleaning effect and can suppress the corrosion and blackening of metals contained in the denture.SOLUTION: The denture cleaning agent according to the present invention contains a foaming agent, a bleaching agent, a surfactant, and metasilicate.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a denture cleanser. [Background technology]

[0002] Dentures are used when teeth are missing, and come in various forms, such as complete dentures and partial dentures, depending on the condition of the missing teeth. Dentures are prone to accumulate deposits such as bacteria, biofilms, and stains, and leaving dentures with deposits attached without cleaning can lead to not only bad breath but also oral diseases such as periodontal disease.

[0003] Therefore, it is essential to clean and keep dentures clean. Furthermore, because deposits on dentures cannot be sufficiently removed by brushing, cleaning with a denture cleanser is also important.

[0004] When cleaning dentures with a denture cleanser, a method of immersing dentures in a denture cleaning solution prepared by mixing the denture cleanser with water may be used.

[0005] Patent Document 1 listed below discloses a solid denture cleanser containing (A) at least one dye selected from the group consisting of azo dyes, xanthene dyes not containing an iodine atom, indigo dyes, triarylmethane dyes, nitroso dyes, and anthraquinone dyes, and (B) a bleaching agent. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-116459 Summary of the Invention [Problem to be solved by the invention]

[0007] When a conventional denture cleanser such as that described in Patent Document 1 is used, the bleaching agent in the denture cleanser may corrode the metal contained in the dentures or cause the metal to blacken due to rust. It is particularly difficult for conventional denture cleansers to inhibit corrosion and blackening of the metal contained in dentures while enhancing their cleaning action. In other words, it is difficult for conventional denture cleansers to achieve both a high cleaning action and excellent inhibition of metal corrosion and blackening.

[0008] An object of the present invention is to provide a denture cleanser that has an enhanced cleaning action and is capable of inhibiting corrosion and blackening of metals contained in dentures. [Means for solving the problem]

[0009] According to a broad aspect of the present invention, there is provided a denture cleanser comprising a foaming agent, a bleaching agent, a surfactant, and a metasilicate.

[0010] In a specific aspect of the denture cleanser according to the present invention, the metasilicate is sodium metasilicate.

[0011] In a specific aspect of the denture cleanser according to the present invention, the content of the metasilicate is 0.1% by weight or more and 8% by weight or less, based on 100% by weight of the denture cleanser.

[0012] In a specific aspect of the denture cleanser according to the present invention, the content of the metasilicate is 0.5 parts by weight or more and 30 parts by weight or less per 100 parts by weight of the bleaching agent.

[0013] In a specific aspect of the denture cleanser according to the present invention, the surfactant includes an anionic surfactant.

[0014] In a particular aspect of the denture cleanser according to the present invention, the denture cleanser further comprises a binder.

[0015] In a specific aspect of the denture cleanser according to the present invention, a denture cleanser solution obtained by mixing 2.8 g of the denture cleanser with 150 mL of water at 25° C. has a pH of 7.5 or more and 12.0 or less. [Effects of the Invention]

[0016] The denture cleanser according to the present invention contains a foaming agent, a bleaching agent, a surfactant, and a metasilicate. Because the denture cleanser according to the present invention has the above-mentioned components, it is possible to enhance the cleaning action and inhibit corrosion and blackening of metals contained in dentures. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention will be described in detail below.

[0018] (denture cleanser) The denture cleanser according to the present invention comprises a foaming agent, a bleaching agent, a surfactant, and a metasilicate. The denture cleanser according to the present invention is a formulation for cleaning dentures.

[0019] Generally, when a denture cleanser contains a bleaching agent, the metal contained in the denture may corrode or the metal may turn black due to rust. In particular, it is difficult for conventional denture cleansers to inhibit corrosion and blackening of the metal contained in the denture while enhancing the cleaning action. That is, it is difficult for conventional denture cleansers to achieve both a high cleaning action and an excellent effect of inhibiting metal corrosion and blackening.

[0020] As a result of extensive research, the present inventors have found that the above problems can be solved by using a bleaching agent and a metasilicate in combination.

[0021] The denture cleanser according to the present invention can enhance cleaning action and inhibit corrosion and blackening of metals contained in dentures. The denture cleanser according to the present invention can achieve both a high cleaning action and an excellent inhibitory effect on metal corrosion and blackening.

[0022] Furthermore, the denture cleanser according to the present invention can enhance disinfecting and antibacterial effects.

[0023] The denture cleanser according to the present invention is preferably used for cleaning complete dentures, partial dentures, or retainers. The denture cleanser according to the present invention is particularly preferably used for cleaning complete dentures or partial dentures. The denture cleanser according to the present invention is preferably used for cleaning dentures that contain metal. The denture cleanser according to the present invention can also be used for cleaning dentures that do not contain metal. The retainer is, for example, an appliance that is worn on the teeth during or after orthodontic treatment. In this specification, dentures include the retainer.

[0024] The material of the dentures that can be cleaned using the denture cleanser is not particularly limited. The dentures may contain resin. The dentures may contain metal. Examples of metals contained in the dentures include zinc, tin, gold, silver, titanium, ruthenium, aluminum, cobalt, chromium, nickel, palladium, platinum, rhodium, iridium, indium, iron, and alloys thereof. The dentures may contain only one type of metal, or two or more types of metals.

[0025] The denture cleanser is preferably used to clean dentures containing silver, zinc, tin, cobalt, chromium, palladium, or alloys thereof as metals.

[0026] The properties of the denture cleanser are not particularly limited. The denture cleanser may be liquid or solid. From the viewpoint of improving handleability, the denture cleanser is preferably solid. When the denture cleanser is solid, it may be in the form of a powder, granules, or tablet. From the viewpoint of improving handleability and further enhancing the cleaning action due to foaming, the denture cleanser is preferably in the form of a tablet (solid).

[0027] When the denture cleanser is in tablet form (solid), the shape of the denture cleanser is not particularly limited. The denture cleanser may be spherical, may have a shape other than spherical, or may be flat, etc.

[0028] The size of the denture cleanser is not particularly limited. From the viewpoint of improving ease of handling and further enhancing the cleaning action due to foaming, when the denture cleanser is in tablet form (solid), the weight per tablet of the denture cleanser is preferably 1.0 g or more, more preferably 2.0 g or more, and preferably 5.0 g or less, more preferably 4.0 g or less.

[0029] The planar surface area of ​​the denture cleanser is preferably 10 mm 2 More than 100mm, preferably 2 More preferably, 200 mm 2 More than 300 mm, especially preferred 2 Above 400mm, most preferably 2 or more, preferably 5000 mm 2 Less than or equal to 2000 mm, preferably 2 Less than 1000mm, more preferably 2 Below 700 mm, particularly preferably 2 Below 500mm, most preferably 2 When the planar area of ​​the denture cleanser is equal to or greater than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, the denture cleanser can be packaged well and can be dissolved well. When the denture cleanser is in a disk shape, an example of the diameter of the disk-shaped denture cleanser is 24 mm.

[0030] The thickness of the denture cleanser is preferably at least 2.0 mm, more preferably at least 2.5 mm, even more preferably at least 3.0 mm, particularly preferably at least 3.5 mm, and is preferably at most 6.0 mm, more preferably at most 5.0 mm, even more preferably at most 4.5 mm, particularly preferably at most 4.0 mm. When the thickness of the denture cleanser is at least the above-mentioned lower limit and at most the above-mentioned upper limit, the denture cleanser can be packaged well and can be dissolved well.

[0031] The hardness of the denture cleanser is preferably 0.8 kgf or more, more preferably 1.0 kgf or more, and even more preferably 1.5 kgf or more. When the hardness of the denture cleanser is at least the above-mentioned lower limit, the denture cleanser can be packaged well, can be dissolved well, and cracking and chipping can be prevented. There is no particular upper limit to the hardness of the denture cleanser. The hardness of the denture cleanser may be 15.0 kgf or less, 10.0 kgf or less, or 7.0 kgf or less.

[0032] The hardness of the denture cleanser can be measured using a hardness tester, such as the "Kiya Hardness Tester" manufactured by Fujiwara Seisakusho.

[0033] The denture cleanser is preferably used by mixing with water. The denture cleanser is preferably used by dissolving in water. The denture cleanser is preferably used as a denture cleanser by mixing with water. The denture cleanser is preferably used as a denture cleanser by dissolving in water.

[0034] From the viewpoint of more effectively inhibiting corrosion and blackening of metals contained in dentures, the denture cleanser is preferably mixed with water so that the pH of the denture cleanser is 7.5 or more and 12.0 or less. From the viewpoint of more effectively inhibiting corrosion and blackening of metals contained in dentures, the pH of the denture cleanser mixed with water is preferably 7.5 or more, more preferably 8.0 or more, even more preferably 8.5 or more, and preferably 12.0 or less, more preferably 11.5 or less, even more preferably 11.0 or less.

[0035] To further enhance the cleaning action due to foaming, the denture cleanser is preferably mixed with water at a temperature of 15° C. or higher but lower than 60° C. To further enhance the cleaning action due to foaming, the temperature of the water mixed with the denture cleanser is preferably 15° C. or higher, more preferably 20° C. or higher, even more preferably 40° C. or higher, and is preferably lower than 60° C., more preferably 50° C. or lower.

[0036] From the viewpoint of more effectively inhibiting corrosion and blackening of metals contained in dentures, the pH of a denture cleanser prepared by mixing 2.8 g of denture cleanser with 150 mL of water at 25°C is preferably 7.5 or higher, more preferably 8.0 or higher, even more preferably 8.5 or higher, and preferably 12.0 or lower, more preferably 11.5 or lower, even more preferably 11.0 or lower.

[0037] The pH of the denture cleanser can be measured, for example, by the following method. 2.8 g of denture cleanser is placed in 150 mL of water at 25°C and dissolved. After the denture cleanser has finished foaming, the mixture is stirred thoroughly and the pH of the resulting denture cleanser is measured using a pH meter. A commercially available pH meter (e.g., Horiba Ltd.'s "F-52") can be used.

[0038] From the viewpoint of further enhancing the cleaning action due to foaming, it is preferable that the denture cleanser precipitate for 40 seconds or more when 2.8 g of the denture cleanser is added to 150 mL of water at 25° C. It is preferable that the denture cleanser precipitate until at least half of its volume is mixed with the water when 2.8 g of the denture cleanser is added to 150 mL of water at 25° C., and it is more preferable that the denture cleanser precipitate until the entire denture cleanser is mixed with the water.

[0039] The method for storing the denture cleanser is not particularly limited. The denture cleanser is preferably stored in a packaging container. When the denture cleanser is in tablet form (solid), each tablet of denture cleanser is preferably stored in a packaging container. Examples of materials for the packaging container include paper and resin.

[0040] Each component contained in the denture cleanser will be described below.

[0041] (foaming agent) The denture cleanser contains a foaming agent, which foams when mixed with water, and the foam can clean dirt (deposits) adhering to dentures.

[0042] The foaming agent is not particularly limited. Examples of the foaming agent include a carbonic acid compound and an acid compound (organic acid or inorganic acid). The foaming agent may be used alone or in combination of two or more.

[0043] From the viewpoint of improving foaming properties, the foaming agent preferably contains a carbonate compound, preferably contains an acid compound, and more preferably contains a carbonate compound and an acid compound. From the viewpoint of improving foaming properties, the foaming agent is preferably a mixture of a carbonate compound and an acid compound.

[0044] Examples of the carbonate compound include carbonates, bicarbonates, and double salts of carbonates and bicarbonates. The carbonate compounds may be used alone or in combination of two or more. Examples of the carbonates include sodium carbonate, potassium carbonate, magnesium carbonate, and calcium carbonate. Examples of the bicarbonates include sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, and calcium bicarbonate. Examples of the double salts of carbonates and bicarbonates include sodium sesquicarbonate.

[0045] From the viewpoint of improving foaming properties, the carbonate compound is preferably a carbonate, and more preferably sodium carbonate or sodium hydrogen carbonate.

[0046] The acid compound may be an organic acid or an inorganic acid. The acid compound may be used alone or in combination of two or more. Examples of the organic acid include citric acid, tartaric acid, fumaric acid, malic acid, maleic acid, gluconic acid, succinic acid, ascorbic acid, malonic acid, and salicylic acid. Examples of the inorganic acid include phosphoric acid, boric acid, and sulfamic acid.

[0047] From the viewpoint of improving foaming properties, the acid compound is preferably an organic acid, and more preferably citric acid, succinic acid, or fumaric acid.

[0048] From the viewpoint of improving foaming properties, it is particularly preferable that the foaming agent contains sodium carbonate or sodium bicarbonate and citric acid, succinic acid, or fumaric acid. From the viewpoint of improving foaming properties, it is particularly preferable that the foaming agent contains sodium carbonate, sodium bicarbonate, citric acid, succinic acid, and fumaric acid. From the viewpoint of improving foaming properties, it is particularly preferable that the foaming agent is a mixture of sodium carbonate, sodium bicarbonate, citric acid, succinic acid, and fumaric acid.

[0049] The content of the foaming agent in the denture cleanser (100% by weight) is preferably 30% by weight or more, more preferably 50% by weight or more, even more preferably 60% by weight or more, and preferably 95% by weight or less, more preferably 90% by weight or less, and even more preferably 80% by weight or less. When the foaming agent content is above the lower limit, the cleaning action can be further enhanced. When the foaming agent content is below the upper limit, it is possible to prevent bubbles from overflowing from the container and prevent dirt-containing foam from adhering to the dentures after cleaning. When the denture cleanser contains two or more foaming agents, the content of the foaming agents refers to the total content of the foaming agents.

[0050] From the viewpoint of further enhancing the cleaning effect, the content of the carbonate compound in 100% by weight of the foaming agent is preferably 30% by weight or more, more preferably 50% by weight or more, even more preferably 60% by weight or more, and is preferably 90% by weight or less, more preferably 80% by weight or less, even more preferably 75% by weight or less.

[0051] From the viewpoint of further enhancing the cleaning action, the content of the acid compound (organic acid or inorganic acid) in the foaming agent is preferably 20 parts by weight or more, more preferably 30 parts by weight or more, even more preferably 40 parts by weight or more, and is preferably 100 parts by weight or less, more preferably 90 parts by weight or less, even more preferably 80 parts by weight or less, relative to 100 parts by weight of the carbonate compound.

[0052] (bleach) The denture cleanser contains a bleaching agent.

[0053] Examples of the bleaching agent include oxygen bleaching agents. Examples of the oxygen bleaching agent include percarbonates, perborates, persulfates, and hydrogen persulfates. From the viewpoint of further enhancing the cleaning effect, the bleaching agent preferably contains a peroxide. The bleaching agent may be used alone or in combination of two or more.

[0054] Examples of the percarbonates include sodium percarbonate, potassium percarbonate, ammonium percarbonate, and hydrates thereof. Examples of the perborates include sodium perborate, potassium perborate, ammonium perborate, and hydrates thereof. Examples of the persulfates include sodium persulfate, potassium persulfate, ammonium persulfate, lithium persulfate, barium persulfate, and hydrates thereof. Examples of the hydrogen persulfates include sodium hydrogen persulfate, potassium hydrogen persulfate, ammonium hydrogen persulfate, and hydrates thereof.

[0055] From the viewpoint of further enhancing the cleaning action, the bleaching agent preferably contains potassium persulfate or sodium perborate, more preferably potassium persulfate, and even more preferably sodium perborate. From the viewpoint of further enhancing the cleaning action, the bleaching agent particularly preferably contains potassium persulfate and sodium perborate.

[0056] The content of the bleaching agent in 100% by weight of the denture cleanser is preferably 1% by weight or more, more preferably 5% by weight or more, even more preferably 10% by weight or more, and preferably 50% by weight or less, more preferably 40% by weight or less, and even more preferably 30% by weight or less. When the content of the bleaching agent is above the lower limit, the cleaning action can be further enhanced. When the content of the bleaching agent is below the upper limit, corrosion and blackening of metal contained in dentures can be more effectively suppressed. When the denture cleanser contains two or more bleaching agents, the content of the bleaching agents refers to the total content of the bleaching agents.

[0057] (surfactant) The denture cleanser contains a surfactant.

[0058] Examples of the surfactant include cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, etc. The surfactants may be used alone or in combination of two or more.

[0059] Examples of the cationic surfactant include alkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, monoalkyl ether quaternary ammonium salts, alkylamine salts, and fatty acid amide amine salts.

[0060] Examples of the anionic surfactants include higher fatty acid salts (higher fatty acid soaps) such as potassium stearate and triethanolamine stearate; alkyl sulfate salts such as sodium lauryl sulfate, triethanolamine lauryl sulfate, sodium myristyl sulfate, sodium stearyl sulfate, sodium oleyl sulfate, and sodium cetyl sulfate; polyoxyethylene alkyl ether sulfates such as sodium polyoxyethylene lauryl ether sulfate and sodium polyoxyethylene myristyl ether sulfate; α-olefin (C14-16) sulfonates such as sodium tetradecene sulfonate; N-acyl methyl taurine salts such as sodium myristoyl methyl taurate, sodium palmitoyl methyl taurate, sodium stearoyl methyl taurate, sodium oleoyl methyl taurate, and sodium coconut oil fatty acid methyl taurate; alkyl sulfosuccinate salts such as dioctyl sodium sulfosuccinate and disodium lauryl sulfosuccinate; and polyoxyethylene sulfosuccinate. polyoxyethylene alkyl salts of sulfosuccinate such as disodium lauryl; monoalkyl phosphate salts such as sodium lauryl phosphate, sodium cetyl phosphate, and diethanolamine cetyl phosphate; polyoxyethylene alkyl ether phosphate salts such as sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, sodium polyoxyethylene alkylphenyl ether phosphate, and triethanolamine polyoxyethylene alkylphenyl ether phosphate; acyl sarcosine salts such as potassium lauroyl sarcosine, triethanolamine lauroyl sarcosine, sodium myristoyl sarcosine, and sodium coconut oil fatty acid sarcosine; N-acyl-N-methyl-β-alanine salts such as sodium lauroyl methylalanine, triethanolamine lauroyl methylalanine, sodium myristoyl methylalanine, and sodium coconut oil fatty acid methylalanine;Acyl glutamates such as sodium lauroyl glutamate, triethanolamine lauroyl glutamate, sodium myristoyl glutamate, potassium stearoyl glutamate, disodium stearoyl glutamate, sodium cocoyl glutamate, and triethanolamine cocoyl glutamate; acylaspartates; acyltaurates; acyl glycine salts such as potassium cocoyl glycine and sodium cocoyl glycine; alkyl ether glycol acetates such as sodium lauryl glycol acetate (sodium dodecane-1,2-diol acetate), potassium lauryl glycol acetate, sodium myristyl glycol acetate, potassium myristyl glycol acetate, sodium palmityl glycol acetate, potassium palmityl glycol acetate, sodium stearyl glycol acetate, potassium stearyl glycol acetate, sodium behenyl glycol acetate, and potassium behenyl glycol acetate;

[0061] Examples of the nonionic surfactants include sorbitan fatty acid esters, glycerin fatty acid esters, and alkylene oxide adducts thereof, polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylphenols, polyoxyethylene sorbit fatty acid esters, polyoxyethylene alkylphenyl formaldehyde condensates, polyoxyethylene sterol and derivatives thereof, polyoxyethylene lanolin and derivatives thereof, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, and polyoxyethylene castor oil.

[0062] Examples of the sorbitan fatty acid esters include sorbitan monooleate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monopalmitate, sorbitan monolaurate, sorbitan trioleate, sorbitan tristearate, sorbitan sesquistearate, sorbitan sesquioleate, sorbitan sesquiisostearate, and sorbitan coconut oil fatty acid.

[0063] Examples of the alkylene oxide adducts of the sorbitan fatty acid esters include polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monoisostearate, polyoxyethylene sorbitan monococonut oil fatty acid polyoxyethylene sorbitan tristearate, and polyoxyethylene sorbitan trioleate.

[0064] The glycerin fatty acid ester may be a monoglycerin fatty acid ester or a polyglycerin fatty acid ester.

[0065] Examples of the monoglycerin fatty acid esters include glyceryl monocaprylate, glyceryl monocaprate, glyceryl monolaurate, glyceryl monomyristate, glyceryl monopalmitate, glyceryl monostearate, glyceryl monoisostearate, glyceryl monobehenate, glyceryl monooleate, glyceryl monoerucate, glyceryl sesquioleate, glyceryl distearate, glyceryl diisostearate, and glyceryl diarachate.

[0066] Examples of the polyglycerol fatty acid esters include polyglycerol fatty acid esters of the monoglycerol fatty acid esters having a degree of polymerization of 2 to 10, such as diglyceryl monocaprylate, decaglyceryl monocaprylate, hexaglyceryl monocaprate, tetraglyceryl monolaurate, hexaglyceryl monolaurate, decaglyceryl monolaurate, polyglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, decaglyceryl monoisostearate, polyglyceryl monostearate, diglyceryl monooleate, hexaglyceryl monooleate, diglyceryl sesquioleate, polyglyceryl diisostearate, polyglyceryl distearate, diglyceryl triisostearate, and polyglyceryl tristearate.

[0067] Examples of the alkylene oxide adducts of the glycerin fatty acid esters include polyoxyethylene glyceryl monostearate and polyoxyethylene glyceryl monooleate.

[0068] Examples of the polyoxyalkylene alkyl ether include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene polyoxypropylene lauryl ether, polyoxypropylene cetyl ether, polyoxypropylene isocetyl ether, polyoxypropylene stearyl ether, and polyoxypropylene oleyl ether.

[0069] Examples of the polyoxyalkylene fatty acid ester include polyethylene glycol fatty acid esters such as polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol distearate, and polyethylene glycol monolaurate; and propylene glycol fatty acid esters such as propylene glycol monostearate, propylene glycol monolaurate, and propylene glycol monooleate.

[0070] Examples of the amphoteric surfactant include alkylamidobetaine-type amphoteric surfactants such as lauric acid amidopropyl betaine and coconut oil fatty acid amidopropyl betaine; glycine-type amphoteric surfactants such as alkylglycine salts, carboxymethylglycine salts, and N-acylaminoethyl-N-2-hydroxyethylglycine salts; aminopropionic acid-type amphoteric surfactants such as alkylaminopropionates and alkyliminodipropionates; alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylaminoacetic acid betaine, and alkyldihydroxyethyl aminoacetic acid betaine-type amphoteric surfactants such as alkylaminoacetic acid betaine; sulfobetaine-type amphoteric surfactants such as alkylhydroxysulfobetaine; imidazolinium-type amphoteric surfactants such as alkylcarboxymethylhydroxyethylimidazolinium betaine; N-alkyl-N,N-dimethylammonium-N-propyl sulfonate; N-alkyl-N,N-dimethylammonium-N-(2-hydroxypropyl) sulfonate; and N-fatty acid amidopropyl-N,N-dimethylammonium-N-(2-hydroxypropyl) sulfonate.

[0071] From the viewpoint of further enhancing the cleaning effect, the surfactant preferably contains an anionic surfactant, more preferably contains an alkyl sulfate, α-olefin (C14-16) sulfonate, or acylamino acid salt, even more preferably contains an alkyl sulfate, particularly preferably contains an alkyl sulfate ester salt, and most preferably contains sodium lauryl sulfate. The α-olefin (C14-16) sulfonate is particularly preferably sodium tetradecene sulfonate (C14). The number of carbon atoms in the acyl group in the acylamino acid salt is preferably 8 or more, more preferably 12 or more, and preferably 18 or less, more preferably 16 or less. The acylamino acid salt is preferably an acyl glutamate, acylaspartate, acyl sarcosine salt, or acyltaurine salt. The acylamino acid salt is preferably an acidic acylamino acid salt, more preferably acyl glutamate or acylaspartate, and particularly preferably acyl glutamate. The acyl glutamate is preferably lauroyl glutamate, myristoyl glutamate, lauroyl glutamate, lauroyl aspartate, lauroyl sarcosine salt, or lauroyl methyl taurine salt, more preferably lauroyl glutamate, and even more preferably sodium lauroyl glutamate. The α-olefin (C14-16) sulfonate and the acyl amino acid salt are preferably alkali metal salts, more preferably sodium salts. The preferred forms described above can further enhance the cleaning effect.

[0072] The content of the surfactant in 100% by weight of the denture cleanser is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and preferably 10% by weight or less, more preferably 7% by weight or less, and even more preferably 5% by weight or less. When the content of the surfactant is above the lower limit, the cleansing action can be further enhanced. When the content of the surfactant is below the upper limit, the solubility of the denture cleanser in water can be increased. When the denture cleanser contains two or more surfactants, the content of the surfactants refers to the total content of the surfactants.

[0073] The content of the anionic surfactant in the denture cleanser (100% by weight) is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and preferably 10% by weight or less, more preferably 7% by weight or less, and even more preferably 5% by weight or less. When the content of the anionic surfactant is above the lower limit, the cleansing action can be further enhanced. When the content of the anionic surfactant is below the upper limit, the denture cleanser's solubility in water can be increased.

[0074] The content of the anionic surfactant is preferably 0.5 parts by weight or more, more preferably 1 part by weight or more, and even more preferably 2 parts by weight or more, and is preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and even more preferably 10 parts by weight or less, relative to 100 parts by weight of the foaming agent. When the content of the anionic surfactant is above the lower limit, the cleaning effect can be further enhanced. When the content of the anionic surfactant is below the upper limit, the denture cleanser's solubility in water can be increased.

[0075] (metasilicate) The denture cleanser contains a metasilicate, which enhances the cleaning action and inhibits corrosion and blackening of metals contained in dentures because it contains a bleaching agent and a metasilicate.

[0076] Examples of the metasilicates include potassium metasilicate, sodium metasilicate, etc. The metasilicates may be used alone or in combination of two or more.

[0077] From the viewpoint of more effectively inhibiting corrosion and blackening of metals contained in dentures, the metasilicate is preferably potassium metasilicate or sodium metasilicate, and more preferably sodium metasilicate.

[0078] The sodium metasilicate may be sodium metasilicate nonahydrate or sodium metasilicate pentahydrate. The sodium metasilicate may be sodium metadisilicate.

[0079] The content of the metasilicate salt in 100% by weight of the denture cleanser is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and preferably 8% by weight or less, more preferably 7% by weight or less, and even more preferably 5% by weight or less. When the content of the metasilicate salt is above the lower limit, corrosion and blackening of metal contained in dentures can be more effectively suppressed. When the content of the metasilicate salt is below the upper limit, the denture cleanser's solubility in water can be increased.

[0080] The content of sodium metasilicate in the denture cleanser (100% by weight) is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and preferably 8% by weight or less, more preferably 7% by weight or less, and even more preferably 5% by weight or less. When the content of sodium metasilicate is above the lower limit, corrosion and blackening of metals contained in dentures can be more effectively suppressed. When the content of sodium metasilicate is below the upper limit, the denture cleanser's solubility in water can be increased.

[0081] The content of the metasilicate salt is preferably 0.5 parts by weight or more, more preferably 1 part by weight or more, even more preferably 3 parts by weight or more, particularly preferably 5 parts by weight or more, and is preferably 30 parts by weight or less, more preferably 20 parts by weight or less, even more preferably 15 parts by weight or less, particularly preferably 10 parts by weight or less, per 100 parts by weight of the bleaching agent. When the content of the metasilicate salt is above the lower limit, corrosion and blackening of metal contained in dentures can be more effectively suppressed. When the content of the metasilicate salt is below the upper limit, the denture cleanser's solubility in water can be increased.

[0082] The content of the sodium metasilicate is preferably 0.5 parts by weight or more, more preferably 1 part by weight or more, even more preferably 3 parts by weight or more, particularly preferably 5 parts by weight or more, and is preferably 30 parts by weight or less, more preferably 20 parts by weight or less, even more preferably 15 parts by weight or less, particularly preferably 10 parts by weight or less, relative to 100 parts by weight of the bleaching agent. When the content of the sodium metasilicate is above the lower limit, corrosion and blackening of metal contained in dentures can be more effectively suppressed. When the content of the sodium metasilicate is below the upper limit, the solubility of the denture cleanser in water can be increased.

[0083] (Other ingredients) The denture cleanser may contain additives such as binders, flavorings, lubricants, deodorizers, colorants, chelating agents, pH adjusters, enzymes, sweeteners, foam stabilizers, preservatives, antibacterial and germicidal agents, antiseptics, bulking agents, excipients, disintegrants, thickeners, anticaking agents, specific gravity adjusters, and fluidizing agents, as needed.

[0084] The denture cleanser preferably further contains a binder. When the denture cleanser further contains a binder, the tableting properties of the denture cleanser can be improved, making it easier to produce a denture cleanser with the desired hardness and thickness.

[0085] Examples of the binder include polyvinylpyrrolidone, polyoxyethylene, polyethylene glycol, carbowax, nonionic surfactants, sodium carboxymethylcellulose, hydroxypropyl cellulose, hydroxypropylmethylcellulose, cellulose, gelatin, clay, lactose, sorbitol, glucose, and xylitol. Only one type of the binder may be used, or two or more types may be used in combination.

[0086] From the viewpoint of improving the tableting properties of the denture cleanser, the binder preferably contains sucrose fatty acid ester, glycerin fatty acid ester, polyethylene glycol, or hydroxypropyl cellulose, and more preferably contains polyethylene glycol or hydroxypropyl cellulose.

[0087] From the viewpoint of improving the tableting properties of the denture cleanser, the content of the binder in 100% by weight of the denture cleanser is preferably 0.1% by weight or more, more preferably 0.5% by weight or more, even more preferably 1% by weight or more, and is preferably 15% by weight or less, more preferably 10% by weight or less, even more preferably 7% by weight or less.

[0088] Examples of the flavoring agent include menthol, salicylic acid, spearmint, peppermint, essential oils, and peppermint oil. The flavoring agent may be used alone or in combination of two or more.

[0089] Examples of the lubricant include sodium benzoate, talc, hydrogenated oil, sucrose fatty acid ester, glycerin fatty acid ester, kaolin, calcium stearate, and magnesium stearate.

[0090] Examples of the enzyme include protease, alcalase, amylase, lipase, dextranase, mutanase, pectinase, cellulase, lysozyme, and glucanase.

[0091] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0092] The following materials were prepared for use in preparing the denture cleanser:

[0093] Foaming Agent: Sodium carbonate (Tokuyama "Soda Ash (Light)") Citric acid ("Citric acid (anhydrous)" manufactured by Showa Kako Co., Ltd.)

[0094] Bleach: Potassium persulfate (LANXESS "OXONE MPS") Sodium perborate ("Parvolac monohydrate" manufactured by Hishiko Chemical Co., Ltd.)

[0095] Surfactants: Sodium lauryl sulfate (anionic surfactant, Kao Corporation's "Emeral 10PT") Ester-type quaternary cation (cationic surfactant, ADEKA Corporation's "Adekamin SF-106") Lauryl alcohol ethoxylate (non-ionic surfactant, ADEKA "Akator LA-775")

[0096] Metasilicate: Sodium metasilicate (Maruzen Pharmaceutical Co., Ltd. "Sodium Metasilicate")

[0097] Salts other than metasilicate: Sodium metaphosphate ("Sodium metaphosphate" manufactured by Taihei Chemical Industry Co., Ltd.) Sodium pyrophosphate ("Sodium pyrophosphate (anhydrous)" manufactured by Taihei Chemical Industry Co., Ltd.)

[0098] Binder: Polyethylene glycol (Sanyo Chemical Industries, Ltd. "PEG-6000P") Hydroxypropyl cellulose ("Cerny" manufactured by Nippon Soda Co., Ltd.)

[0099] Fragrance: Mint powder (Nagaoka Jitsugyo Co., Ltd. "Mint Powder 101")

[0100] Weighting agent: Sodium sulfate ("Neutral anhydrous Glauber's salt" manufactured by Tosoh Corporation)

[0101] lubricant: Hardened rapeseed oil (Kawaken Fine Chemicals "Lubriwax-102H")

[0102] In addition, the following metal pieces were prepared for use in evaluating denture cleansers.

[0103] Metal piece: Unisilver 65 (manufactured by Yamakin, 65% silver by weight, 15% zinc by weight, 19.95% tin by weight, 0.05% other (ruthenium, aluminum) by weight, disc shape, 0.5 cm diameter x 0.15 cm thick) Silvidium H (manufactured by Nippon Shiken Kogyo Co., Ltd.; 68% silver by weight, 15% zinc by weight, 12% isodium by weight, 5% other substances by weight; disc-shaped, 0.7 cm diameter x 0.2 cm thick) Mirobrite (manufactured by GC Corporation, 72% silver by weight, 13% zinc by weight, 9% tin by weight, 6% isodium by weight, 0.4 cm diameter x 0.2 cm thick disc shape)

[0104] Examples 1 to 8 The ingredients shown in Tables 1 and 2 below were mixed in the amounts shown in Tables 1 and 2 below, and the mixture was compressed into tablets at 60 kN using a mold with a diameter of 2.4 cm to obtain denture cleanser tablets weighing 2.8 g each.

[0105] (Comparative Example 1) A denture cleanser was obtained in the same manner as in Example 7, except that sodium metasilicate was not used and a specific gravity adjuster was used.

[0106] (Comparative Example 2) A denture cleanser was obtained in the same manner as in Example 7, except that sodium metasilicate was changed to sodium metaphosphate.

[0107] (Comparative Example 3) A denture cleanser was obtained in the same manner as in Example 7, except that sodium metasilicate was changed to sodium pyrophosphate.

[0108] (evaluation) (1) pH of denture cleaning solution One denture cleanser thus obtained was placed in 150 mL of water at 25° C. and dissolved. After the denture cleanser had finished foaming, it was stirred well, and the pH of the resulting denture cleanser was measured using a pH meter (Horiba Ltd., "F-52").

[0109] (2) Cleansing effect Referring to JIS K3362, "9.2 Evaluation method for the detergency of synthetic detergents for kitchen use," a test glass piece was prepared by immersing a glass slide in an artificial soil solution for 1 minute and air-drying for 10 minutes, repeating this process twice. One denture cleanser was placed in a beaker containing 150 mL of water at 15°C, followed immediately by the glass piece. After leaving it to stand for 5 minutes, the test glass piece was removed and rinsed with water, and the state of soiling on the glass piece was visually observed. A similar test was also performed when the water temperature was 40°C. The cleaning action of the denture cleanser was evaluated according to the following criteria.

[0110] [Criteria for determining cleaning effect] ○○: Almost no dirt was observed ○: Very little dirt was observed ×: Stains were observed all over the surface

[0111] (3) Inhibition of metal corrosion and blackening One denture cleanser was placed in 150 mL of water at 25°C and dissolved to prepare three denture cleansers. After foaming of the denture cleanser was completed, the mixture was thoroughly stirred, and metal pieces (Unisilver 65, Silvidium H, and Mirobrite) were added to each of the three denture cleansers. The denture cleansers containing the metal pieces (Unisilver 65), the denture cleansers containing the metal pieces (Silvidium H), and the denture cleansers containing the metal pieces (Mirobrite) were allowed to stand for 8 hours, after which the metal pieces were removed and rinsed with water. Then, both surfaces of the metal pieces were visually inspected for the presence of corrosion or blackening. The inhibition of metal corrosion and blackening was evaluated according to the following criteria.

[0112] [Criteria for determining metal corrosion and blackening inhibition] ○○: Almost no corrosion or blackening was observed ○: At least one of corrosion and blackening was observed very slightly ×: At least one of corrosion and blackening was observed throughout the surface

[0113] The compositions of the denture cleansers and the results are shown in Tables 1 to 3 below.

[0114] [Table 1]

[0115] [Table 2]

[0116] [Table 3]

[0117] After observing "(3) Inhibition of metal corrosion and blackening," each metal piece was returned to the denture cleaning solution, and after 10, 20, and 30 days, the metal piece was removed, rinsed with water, and visually observed again. For the metal pieces of Examples 1 to 8, almost no corrosion or blackening was observed after 10, 20, or 30 days. On the other hand, for the metal pieces of Comparative Examples 1 to 3, corrosion or blackening was observed throughout.

Claims

1. a foaming agent, a bleaching agent, a surfactant, and a metasilicate; the foaming agent comprises an organic acid; A denture cleanser (excluding denture cleansers containing enzymes) in which the pH of the denture cleanser solution obtained by mixing 2.8 g of the denture cleanser with 150 mL of water at 25°C is 7.5 or more and 12.0 or less.

2. 2. The denture cleanser of claim 1, wherein the metasilicate is sodium metasilicate.

3. 3. The denture cleanser according to claim 1, wherein the content of the metasilicate salt is 0.1% by weight or more and 8% by weight or less, based on 100% by weight of the denture cleanser.

4. 3. The denture cleanser according to claim 1, wherein the content of the metasilicate is 0.5 parts by weight or more and 30 parts by weight or less per 100 parts by weight of the bleaching agent.

5. The denture cleanser according to claim 1 or 2, wherein the surfactant comprises an anionic surfactant.

6. 3. The denture cleanser of claim 1, further comprising a binder.

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