Solid dentifrice

Abstract

To provide a solid dentifrice capable of selecting a new form as the dentifrice.SOLUTION: A dentifrice containing at least water as a base material, a water-soluble solvent, a thickener, and a flavor adjusting agent, wherein 1.5 to 3.0 parts by weight of agar is contained as a solidifying agent for solidifying the dentifrice. The water-soluble solvent contains one or more of glycerin, polyethylene glycol and ethanol. When the solid dentifrice is allowed to stand for one month in an environment of 40 °C and 75% humidity, the solid dentifrices do not bind to each other.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to solidified dentifrices. [Background technology]

[0002] Dentifrices are used to remove plaque and are also given various other functions depending on the ingredients they contain. For example, fluoride compounds such as sodium fluoride can be added to provide tooth remineralization, and sodium chloride can be added to provide periodontal disease prevention. Calcium carbonate can also be added as an abrasive to make it easier to remove stains from teeth.

[0003] There are also toothpastes that cater to user preferences, such as those that contain flavorings or sweeteners such as xylitol to adjust the flavor, or those that use coloring agents to improve the appearance, etc. In addition, toothpastes that meet a variety of needs are available, including those that contain ingredients that prevent bad breath or that improve the refreshing feeling after brushing teeth (see, for example, Patent Document 1).

[0004] The amount of humectant and binder in such dentifrices can be adjusted to suit the desired feel, and the appropriate form, such as paste, liquid, gel, or powder dentifrices, can be selected depending on the ingredients and needs. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-87776 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, dentifrices are formulated to contain medicinal ingredients such as fluorine compounds, and optional ingredients such as abrasives, humectants, and flavor adjusters, depending on the needs of the patient. However, because all dentifrices are used by placing an appropriate amount on a toothbrush and then brushing the teeth in the oral cavity, their form is limited to similar forms such as paste, liquid, gel, and powder, as described above.

[0007] The present invention has been made in view of the above points, and provides a solid dentifrice that allows selection of a new form of dentifrice. [Means for solving the problem]

[0008] The present invention relates to a solid dentifrice containing at least water as a base material, a water-soluble solvent, a thickener, and a flavor modifier, and characterized in that it contains 1.5 to 3.0 parts by weight of agar as a solidifying agent for solidifying the dentifrice.

[0009] The present invention further relates to a solid dentifrice in which the water-soluble solvent contains one or more of glycerin, polyethylene glycol, and ethanol.

[0010] Furthermore, the present invention relates to solid dentifrices containing or not containing silica.

[0011] The present invention further relates to a solid dentifrice containing 2.0 parts by weight or less of a foaming agent, or containing no foaming agent.

[0012] The present invention further relates to a solid toothpaste containing an abrasive.

[0013] Furthermore, the present invention relates to a solid dentifrice that does not stick together when left standing for one month in an environment of 40°C and 75% humidity. [Effects of the Invention]

[0014] According to the present invention, by adding a predetermined amount of agar, a naturally occurring ingredient, to a dentifrice containing known ingredients commonly used in dentifrice, the dentifrice can be made into a solid form and its properties can be stably maintained. Furthermore, since it can be made into a solid dentifrice, its appearance can be freely set, which improves customer appeal with its excellent appearance, and the distribution form can be freely selected, contributing to the improvement of commercial value. [Brief explanation of the drawings]

[0015] [Figure 1] This is a photograph of the solid toothpaste of Prototype Example 1 after being left to stand for one month at 50°C (Condition 1). [Figure 2] This is a photograph of the solid toothpaste of Prototype Example 1 left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 3] This is a photograph of the solid toothpaste of Prototype Example 1 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 4] This is a photograph of the solid toothpaste of Prototype Example 1 (Condition 4) left to stand at 4°C for one month. [Figure 5] 1 is a photograph of the solid toothpaste of Prototype Example 2 immediately after preparation. [Figure 6] 1 is a photograph of the solid toothpaste of Prototype Example 3 after being left to stand for one month at 50°C (Condition 1). [Figure 7] This is a photograph of the solid toothpaste of Prototype Example 3 after being left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 8] This is a photograph of the solid toothpaste of Prototype Example 3 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 9] This is a photograph of the solid toothpaste of Prototype Example 3 (Condition 4) left to stand at 4°C for one month. [Figure 10] 1 is a photograph of the solid toothpaste of Prototype Example 4 immediately after preparation. [Figure 11] This is a photograph of the solid toothpaste of Prototype Example 6 after being left to stand for one month under the condition of 50°C (Condition 1). [Figure 12] This is a photograph of the solid toothpaste of Prototype Example 6 after being left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 13] This is a photograph of the solid toothpaste of Prototype Example 6 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 14] This is a photograph of the solid toothpaste of Prototype Example 6 (Condition 4) left to stand at 4°C for one month. [Figure 15] 1 is a photograph of the solid toothpaste of Prototype Example 7 left standing for one month at 50°C (Condition 1). [Figure 16] This is a photograph of the solid toothpaste of Prototype Example 7 left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 17] This is a photograph of the solid toothpaste of Prototype Example 7 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 18] This is a photograph of the solid toothpaste of Prototype Example 7 (Condition 4) left to stand at 4°C for one month. [Figure 19] 1 is a photograph of the solid toothpaste of Prototype Example 8 after being left to stand for one month at 50°C (Condition 1). [Figure 20] This is a photograph of the solid toothpaste of Prototype Example 8 after being left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 21] This is a photograph of the solid toothpaste of Prototype Example 8 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 22] This is a photograph of the solid toothpaste of Prototype Example 8 (Condition 4) left to stand at 4°C for one month. [Figure 23] 1 is a photograph of the solid toothpaste of Prototype Example 9 after being left to stand for one month at 50°C (Condition 1). [Figure 24] This is a photograph of the solid toothpaste of Prototype Example 9 after being left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 25] This is a photograph of the solid toothpaste of Prototype Example 9 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 26]This is a photograph of the solid toothpaste of Prototype Example 9 (Condition 4) left to stand at 4°C for one month. [Figure 27] 1 is a photograph of the solid toothpaste of Prototype Example 10 after being left to stand for one month at 50°C (Condition 1). [Figure 28] This is a photograph of the solid toothpaste of Prototype Example 10 after being left to stand for one month under conditions of 40°C and humidity of 75°C (Condition 2). [Figure 29] This is a photograph of the solid toothpaste of Prototype Example 10 (Condition 3) left to stand for one month at room temperature (approximately 25°C). [Figure 30] 10 is a photograph of the solid toothpaste of Prototype Example 10 (Condition 4) left to stand at 4°C for one month. DETAILED DESCRIPTION OF THE INVENTION

[0016] The solid dentifrice of the present invention refers to a solid dentifrice that is firm enough to be held between fingers and maintains a predetermined shape. The solid dentifrice may have a certain degree of elasticity, and preferably has a non-sticky surface and does not synergize. The solid dentifrice is chewed in the oral cavity to soften it, and then used for brushing teeth with a toothbrush. The solid dentifrice of the present invention contains at least water as a base material, a water-soluble solvent, a thickener, and a flavor adjuster, and further contains 1.5 to 3.0 parts by weight of agar as a solidifying agent for solidification.

[0017] Generally, thickening polysaccharides, which are called gelling agents or thickening coagulants, include plant-derived agar and tamarind gum, as well as animal-derived gelatin and microbial-derived gellan gum, etc. These are often used to solidify foods such as jellies or to adjust the viscosity of seasonings such as sauces and dressings.

[0018] As shown in the examples below, among the above-mentioned polysaccharide thickeners that may be used to solidify dentifrice, agar is preferably used as the fixative in the present invention. Other polysaccharide thickeners are not suitable for stable solidification of dentifrice. Dentifrice is composed of various ingredients, including cleaning agents necessary for brushing teeth and humectants to improve usability, as well as foaming agents and medicinal ingredients according to various needs, flavor adjusters as appropriate, and surfactants and solvents to blend these ingredients. Therefore, polysaccharide thickeners that can be used as solidifiers to solidify dentifrice must be able to solidify without impairing the usability and medicinal efficacy of the dentifrice and must be highly stable after solidification. Furthermore, the solidifier content must be small so as not to interfere with the usability and medicinal efficacy of the dentifrice, as described above.

[0019] Agar is a plant-derived thickening polysaccharide that is almost tasteless and does not affect the flavor or taste of dentifrice when incorporated therein, and does not interfere with the medicinal effects, such as the refreshing feeling after use and prevention of bad breath. The solid dentifrice of the present invention, which contains 1.5 to 3.0 parts by weight of agar as a solidifying agent, can be solidified without changing the main ingredients of conventional dentifrices, while maintaining the same feel and medicinal effects. Liquid separation is suppressed, resulting in excellent stability. However, if the agar content is too low, the solidification stability may decrease or liquid separation (syneresis) may occur. If the agar content is too high, the dentifrice may become hard and may be less economical.

[0020] In addition, active ingredients such as medicinal ingredients, cleaning agents, abrasives, humectants, foaming agents, solubilizing agents, preservatives, colorants, pH adjusters, thickeners (binders), and other active ingredients commonly used in dentifrices can be added as needed. Purified water is used as the base material. The amount of water to be added is adjusted depending on the other ingredients, and is generally about 25 to 80 parts by weight.

[0021] Water-soluble solvents have the effect of dissolving and dispersing each component. Furthermore, depending on the type of water-soluble solvent, some may also have other functions, such as wetting agents or sweeteners. Examples of water-soluble solvents include polyhydric alcohols such as glycerin, polyethylene glycol, and propylene glycol, and sugar alcohols such as ethanol and sorbitol. These are used alone or in combination. Glycerin, polyethylene glycol, and ethanol are particularly suitable for use in terms of stability, safety, and cost. The amount of water-soluble solvent added is adjusted depending on the other components, and is generally added up to about 50 parts by weight.

[0022] Dentifrices may contain cleaning agents. The solid dentifrice of the present invention may also contain cleaning agents, as in ordinary dentifrices. Furthermore, some cleaning agents may also function as thickeners or abrasives. Examples of cleaning agents include silica and calcium carbonate. These may be used alone or in combination. Silica is particularly preferred for its stability, safety, and cost. Silica is added to solid dentifrices as needed to adjust the feel of use. Silica may not be included in some solid dentifrices, but if it is included, it is generally added in an amount of approximately 15 to 20 parts by weight at most, since silica also acts as a thickener.

[0023] Dentifrices may contain foaming agents for foaming or as a cleansing component. The solid dentifrice of the present invention may also contain a foaming agent, as in conventional dentifrices. Examples of foaming agents include anionic surfactants and amphoteric surfactants. Specific examples include alkyl sulfates such as sodium lauryl sulfate and sodium myristyl sulfate, N-acyl sarcosinates such as sodium N-lauroyl sarcosinate, N-acyl glutamates, α-olefin sulfonates, fatty acid soaps such as soap bases, amino acid betaine surfactants such as cocamidopropyl betaine, and glycine surfactants such as sodium cocoamphoacetate. These may be used alone or in combination. Sodium lauryl sulfate is particularly preferred in terms of stability, safety, and cost. These foaming agents are added to solid dentifrices as needed to adjust the feel during use. Foaming agents may not be included, and if they are included, the amount of foaming agent added should be up to 2 parts by weight from the perspective of long-term stability.

[0024] Dentifrices may contain abrasives as stain-removing ingredients. The solid dentifrice of the present invention may also contain abrasives, as in conventional dentifrices. Examples of abrasives include abrasive silicas such as calcium carbonate and silicic anhydride, and clay-based abrasives such as aluminum hydroxide, calcium phosphate, hydroxyapatite, and kaolin. These may be used alone or in combination. Calcium carbonate is particularly preferred for its stability, safety, and cost. Abrasives are often considered to be synonymous with cleaning agents, and abrasive silicas such as calcium carbonate and silicic anhydride also function as cleaning agents, as described above, and can therefore be used as both abrasives and cleaning agents. These abrasives are added to solid dentifrices as appropriate to adjust the feel during use. Abrasives may not be included, but if they are included, the amount of abrasive added should be determined based on the desired appearance characteristics, as the presence of an abrasive will result in a white solid dentifrice. Furthermore, if the amount of abrasive compounded is too large, it may become brittle, so it is best to limit the amount compounded to the amount normally used in paste-type toothpastes and the like.

[0025] Dentifrices may contain solubilizers. The solid dentifrice of the present invention may also contain solubilizers, as in conventional dentifrices. Examples of solubilizers include nonionic surfactants. These may be used alone or in combination. In particular, polyoxyethylene hydrogenated castor oil may be preferably used as a nonionic surfactant in terms of stability, safety, and cost.

[0026] Dentifrices may contain flavor adjusters such as flavorings and sweeteners. The solid dentifrice of the present invention may also contain flavor adjusters, as in conventional dentifrices. Examples of flavorings include natural flavors such as peppermint oil and citrus oil, single flavors such as menthol, and compound flavors such as various flavors, some of which also act as refreshing agents. These may be used alone or in combination. The flavoring is preferably contained in an amount of approximately 0.1 to 2 parts by weight. Examples of sweeteners include xylitol, saccharin sodium, stevia extract, etc., and these may be used alone or in combination.

[0027] Dentifrices may contain a pH adjuster. The solid dentifrice of the present invention may also contain a pH adjuster, as in conventional dentifrices. Examples of pH adjusters include organic acids such as citric acid, phthalic acid, succinic acid, acetic acid, malic acid, and lactic acid, or their salts, and hydroxides such as sodium hydroxide. These may be used alone or in combination. The amount of pH adjuster added is generally adjusted so that the pH of the dentifrice is approximately 6 to 8.

[0028] Dentifrices may contain medicinal ingredients. The solid dentifrice of the present invention may also contain medicinal ingredients, as in conventional dentifrices. Examples of medicinal ingredients include those generally specified in the Ministry of Health, Labor and Welfare's "Standards for Approval of the Manufacturing and Marketing of Medicinal Toothpastes" (Public Health and Safety Bureau Notification No. 0628-13, June 28, 2021). In particular, these include fluorine compounds such as sodium fluoride, nonionic and cationic bactericides, as well as anti-inflammatory agents and enzymes. Furthermore, functional ingredients such as plant extracts and vitamins may be incorporated as appropriate to provide desired functionality. These medicinal ingredients may be used alone or in combination to achieve the functionality that constitutes the product concept. The medicinal ingredients are incorporated in an amount sufficient to achieve the desired functionality.

[0029] Dentifrices may contain preservatives. The solid dentifrice of the present invention may also contain preservatives, as in conventional dentifrices. Examples of preservatives include parahydroxybenzoic acid esters such as methylparaben and ethylparaben, phenoxyethanol, benzoic acid and its salts, etc. These may be used alone or in combination.

[0030] Furthermore, dentifrices may contain colorants. As mentioned above, if an abrasive such as calcium carbonate is not added, the composition will be transparent or translucent, and the color will be good when a colorant is added. Conversely, if an abrasive is added, the composition will be white, and when a colorant is added, the color will be matte. Since the solid dentifrice of the present invention is a new form of dentifrice in the form of a solid, it is possible to impart an even better appearance by adding a colorant and molding it into any shape. Examples of colorants include pigments, whitening agents such as titanium oxide, legal dyes, natural dyes, charcoal powder, etc. These may be used alone or in combination.

[0031] In addition to these, known ingredients generally contained in dentifrices may be appropriately contained. The additives used in dentifrices are not limited to the materials listed above. Furthermore, some materials may have multiple functions, and multiple types of additives may serve the same purpose. The method for producing the solid dentifrice of the present invention is not particularly limited, but an example includes a method in which, after preparing the water-soluble component, other components are mixed and degassed, heated agar is poured into the mixture, and the mixture is mixed, and the mixture is then poured into a mold and cooled to produce the solid dentifrice.

[0032] The solid dentifrice of the present invention can be stably solidified and also has excellent stability over time. When left standing for one month in an environment of 40°C and 75% humidity, the solid dentifrice does not adhere to itself, does not become sticky due to water separation, or does not dry out. Furthermore, there is no change in the feel when used, so the solid dentifrice of the present invention has excellent shape and appearance stability as well as excellent stability over time. Therefore, the appearance can be freely set, and the excellent appearance can improve customer appeal, and the easy handling and distribution form can be freely selected, thereby increasing commercial value. [Example]

[0033] [Materials used] The inventors used the following materials to prepare the prototype solid dentifrice. The purpose of each ingredient is also noted.

[0034] ·Purified water: <base material> Glycerin: <Water-soluble solvent> <Humectant> "Concentrated glycerin for cosmetics" manufactured by Sakamoto Pharmaceutical Industry Co., Ltd. Polyethylene glycol: <Water-soluble solvent> <Wetting agent> "PEG-400" manufactured by Toho Chemical Industry Co., Ltd. Sorbitol: <Water-soluble solvent> <Humectant> <Flavor modifier> Mitsubishi Corporation Life Sciences Co., Ltd. "Sorbit L-70" Cellulose gum: <Thickener> Ashland Japan Co., Ltd., "Blanose CMC 7LF" · Silica: <Detergent><Thickener> Manufactured by Tosoh Silica Corporation, "NIPSIL VN3" · Sodium lauryl sulfate: <Foaming agent> Manufactured by Kao Corporation, "EMAL 10PT" · Ethanol: <Solvent> Manufactured by Nippon Yakka Kogyo Co., Ltd., "95-degree fermented alcohol" · Polyoxyethylene hydrogenated castor oil: <Solubilizer> Manufactured by Kao Corporation, "EMANON CH-60(K)" · Fragrance: <Fragrance regulator> Manufactured by Eikodo Co., Ltd., "Peppermint oil" · Preservative: <Preservative> Manufactured by Ueno Pharmaceutical Co., Ltd., "Merkins-M" · pH adjuster: <pH adjuster> Manufactured by Iwata Chemical Industry Co., Ltd., "Trisodium citrate (crystalline)" · Sweetener: <Fragrance regulator> Manufactured by Mitsubishi Corporation Life Sciences, "Xylitol" · Agar: <Solidifying agent> Manufactured by Ina Food Industry Co., Ltd., "Agar raw material CS-83" · Gelatin: <Solidifying agent> Manufactured by Nippi Co., Ltd., "Nippi gelatin AP-250" · Tamarind gum: <Solidifying agent> Manufactured by MP Gokyo Food & Chemical Co., Ltd., "Griloid 6C" · Gellan gum: <Solidifying agent> Manufactured by MP Gokyo Food & Chemical Co., Ltd., "Kelcogel HM"

[0035] [Preparation of solid dentifrice] The inventor prepared the solid dentifrice of the following trial production examples using the above materials. First, as the selection of the solidifying agent, trial production examples 1 to 5 with the solidifying agent changed were prepared.

[0036] [Trial production example 1] 50.45 parts by weight of purified water, 5.0 parts by weight of glycerin, 2.0 parts by weight of cellulose gum, 25.0 parts by weight of sorbitol, 2.0 parts by weight of agar, 0.5 parts by weight of sodium lauryl sulfate, 11.0 parts by weight of silica, 0.15 parts by weight of preservative, 1.0 parts by weight of pH adjuster, and 0.4 parts by weight of sweetener were heated and stirred at approximately 80-90°C. The mixture was then cooled to approximately 50°C, and a mixture of 1.0 parts by weight of ethanol, 0.9 parts by weight of polyoxyethylene hydrogenated castor oil, and 0.6 parts by weight of flavoring was added and stirred thoroughly. The mixture was poured into a mold and solidified while cooling to obtain the solid dentifrice of Prototype Example 1. Photographs of Prototype Example 1 after standing for one month under conditions 1 to 4 of the stability evaluation described below are shown in Figures 1 to 4, respectively.

[0037] [Prototype 2] A solid toothpaste of Sample 2 was obtained in the same manner as Sample 1, except that gelatin was used instead of agar. Figure 5 shows a photograph of Sample 2 immediately after preparation.

[0038] [Prototype 3] A solid toothpaste of Prototype Example 3 was obtained in the same manner as Prototype Example 1, except that tamarind gum was used instead of agar. Photographs of Prototype Example 3 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 6 to 9, respectively.

[0039] [Prototype 4] A solid dentifrice of Prototype Example 4 was obtained in the same manner as Prototype Example 1, except that gellan gum was used instead of agar. A solid dentifrice of Prototype Example 4 was obtained. Figure 10 shows a photograph of Prototype Example 2 immediately after preparation.

[0040] [Prototype 5] A solid toothpaste of prototype example 5 was obtained in the same manner as prototype example 1, except that the ingredients were 34.75 parts by weight of purified water, 15.0 parts by weight of glycerin, 2.0 parts by weight of polyethylene glycol, 2.0 parts by weight of cellulose gum, 25.0 parts by weight of sorbitol, 5.0 parts by weight of gelatin, 1.2 parts by weight of sodium lauryl sulfate, 11.0 parts by weight of silica, 1.0 part by weight of ethanol, 0.9 parts by weight of polyoxyethylene hydrogenated castor oil, 0.8 parts by weight of fragrance, 0.15 parts by weight of preservative, 1.0 part by weight of pH adjuster, and 0.2 parts by weight of sweetener.

[0041] [Evaluation of properties of solid toothpaste] The solid toothpaste of each prototype was visually inspected and picked up by hand to check for stickiness, hardness, etc., and to confirm whether it had solidified. Immediately after preparation, the solid toothpaste that was solidified to the extent that it could be picked up without any release of water or stickiness was rated as "Good", sticky but solidified as "Good", and not solidified as "Poor".

[0042] [Stability evaluation of solid toothpaste] Each prototype solid dentifrice was left to stand for one month under the following conditions 1 to 4, and the changes in properties of the solid dentifrice were checked. Solid dentifrices whose properties had changed from immediately after preparation, such as changes to the surface due to stickiness or drying, or disintegration, were marked with an "X", and solid dentifrices whose properties had not changed from immediately after preparation were marked with an "O". Condition 1: Temperature 50°C in a thermostatic chamber (Sanyo Electric Co., Ltd., "Heat Incubator MIR-162") Condition 2: Temperature 40°C and humidity 75% in a thermostatic chamber (Tokyo Rikakikai Co., Ltd., "thermo-hygrostat KCL-2000") ·Condition 3: Room temperature (about 25℃) Condition 4: Temperature controlled bath (Fukushima Industries Co., Ltd., "Low Temperature Incubator FMU-203I") at 4°C

[0043] [Table 1]

[0044] [Evaluation of properties and stability of solid dentifrice] Figures 1-4 and 6-9 show photographs of Prototype 1 and Prototype 3, which were successfully solidified, after being left to stand for one month under conditions 1-4, and Figures 5 and 10 show photographs of Prototype 2 and Prototype 4, which were unsuccessful in solidifying, immediately after preparation. Prototype 1, which used agar, solidified well, and the properties of the solid dentifrice did not change even under conditions 1-4, and the solid dentifrice did not stick together or separate, demonstrating good stability. Prototype 3, which used tamarind gum, solidified well, but was sticky and the solid dentifrice stuck together (properties evaluation: "△"). Under conditions 1 to 4, the solid toothpaste of prototype 3 stuck together even at room temperature or below (conditions 3 and 4), and under high temperature conditions (conditions 1 and 2), the solid toothpaste melted and could not maintain its solid state, causing the solid toothpaste to stick together.

[0045] In Sample 2, which used gelatin, the consistency was like a thick, fluid gel and could not be solidified at all. Sample 4, which used gellan gum, did not have the fluidity of Sample 3, but could not be solidified at all.

[0046] Furthermore, Prototype 5, which contained an increased amount of gelatin, solidified immediately after preparation and exhibited a soft, fluffy texture rather than a hard consistency. Under conditions 1 to 4, the solid dentifrice particles of Prototype 5 became sticky and stuck together even at room temperature or below (conditions 3 and 4), and at high temperatures (conditions 1 and 2), the solid dentifrice melted, was unable to maintain its solid state, and stuck together. Furthermore, Prototype 5, which contained an increased amount of gelatin, had a strong odor characteristic of gelatin.

[0047] These results demonstrate that agar is suitable as a solidifying agent for toothpaste. The solid toothpaste solidified with agar exhibited good stability even under harsh conditions, and was excellent in both properties and stability.

[0048] [Preparation of solid toothpaste] Next, the inventors prepared the following prototype solid dentifrices using the above materials and varying the amount of agar used as a solidifying agent. To create a transparent solid dentifrice, a prototype was also prepared without the foaming agent and silica.

[0049] [Prototype 6] A solid dentifrice of Prototype Example 6 was obtained in the same manner as in Prototype Example 1, except that 1.5 parts by weight of agar and 50.95 parts by weight of purified water were used. Photographs of Prototype Example 6 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 11 to 14, respectively.

[0050] [Prototype 7] A solid dentifrice of Prototype Example 7 was obtained in the same manner as in Prototype Example 1, except that 1.8 parts by weight of agar and 50.65 parts by weight of purified water were used. Photographs of Prototype Example 7 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 15 to 18, respectively.

[0051] [Prototype 8] A solid dentifrice of Prototype Example 8 was obtained in the same manner as in Prototype Example 1, except that 2.5 parts by weight of agar and 49.95 parts by weight of purified water were used. Photographs of Prototype Example 8 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 19 to 22, respectively.

[0052] [Prototype 9] A solid dentifrice of Prototype Example 9 was obtained in the same manner as in Prototype Example 1, except that the amount of agar was 3.0 parts by weight and the amount of purified water was 49.45 parts by weight. Photographs of Prototype Example 9 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 23 to 26, respectively.

[0053] [Prototype 10] A solid dentifrice of Prototype Example 10 was obtained in the same manner as in Prototype Example 1, except that the ingredients were 50.95 parts by weight of purified water, 10.0 parts by weight of glycerin, 2.5 parts by weight of cellulose gum, 30.0 parts by weight of sorbitol, 2.0 parts by weight of agar, 1.0 part by weight of ethanol, 1.7 parts by weight of polyoxyethylene hydrogenated castor oil, 0.4 parts by weight of flavoring, 0.15 parts by weight of preservative, 1.0 part by weight of pH adjuster, and 0.2 parts by weight of sweetener. A trace amount of colorant was added to Prototype Example 10. Photographs of Prototype Example 10 left to stand for one month under conditions 1 to 4 in the stability evaluation described below are shown in Figures 27 to 30, respectively.

[0054] Samples 6 to 10 were similarly evaluated based on the above property evaluation and stability evaluation.

[0055] [Table 2]

[0056] [Evaluation of properties and stability of solid dentifrice 2] All of the solid dentifrices in Prototype Examples 6 to 9 were able to be solidified. Figures 11 to 26 show photographs of Prototype Examples 6 to 9 after being left stationary for one month under conditions 1 to 4. Prototype Example 6, in which the amount of agar was 1.5 parts by weight, solidified well, and the properties of the solid dentifrice did not change under conditions 1 to 4, and the solid dentifrice did not stick together or synergize, demonstrating good stability. Prototype Example 9, in which the amount of agar was 3.0 parts by weight, solidified well, and the properties of the solid dentifrice did not change under conditions 1 to 4, and the solid dentifrice did not stick together or synergize, demonstrating good stability.

[0057] Sample 6, which contained a small amount of agar, did not adhere to the surface when touched with the fingers and had stable properties. Sample 9, which contained a large amount of agar, felt slightly harder than Sample 6, but was easy to chew and provided a good feel when used as a solid toothpaste. This shows that by using 1.5 to 3.0 parts by weight of agar as a solidifying agent, a stable solid toothpaste can be obtained, and the stability of properties is improved without impairing the feel when used.

[0058] Even Prototype 10, prepared as a transparent solid dentifrice, was able to solidify. As shown in Figures 27 to 30, which are photographs of the solid dentifrice after standing for one month under conditions 1 to 4, the properties of the solid dentifrice remained unchanged, and the solid dentifrice did not stick together or separate, demonstrating good stability. This demonstrates that adding an appropriate amount of agar not only allows the dentifrice to be well solidified, but also provides excellent stability over time. Furthermore, the addition of whitening agents such as silica results in a matte-type solid dentifrice, and removing these agents results in a transparent solid dentifrice, confirming the possibility of producing a solid dentifrice with excellent appearance and high customer appeal.

[0059] [Sensory test] Furthermore, the solidified prototypes 1, 6-9 were tested for their usability as toothpaste. Each prototype was chewed in the mouth and brushed with a toothbrush, and the usability was compared with that of regular toothpastes such as gels. For all prototypes, chewing the toothpaste several times to break it up to a certain extent before brushing further broke it up, changing its properties to those of regular toothpaste held in the mouth, making it possible to brush teeth without any discomfort. The refreshing feeling after brushing was also comparable, and there was no unpleasant odor, making it possible to use the prototypes as toothpastes.

[0060] As shown in Tables 1 and 2 and Figures 1 to 30, when a solid dentifrice contains an appropriate amount of agar, it can be solidified, exhibits stability over time, and has a feel that is not inferior to that of regular dentifrice. As a result, the solid dentifrice of the present invention allows for the selection of a new form of dentifrice and can contribute to the creation of new demand. [Industrial Applicability]

[0061] According to the solid dentifrice of the present invention, by incorporating an appropriate amount of agar in a conventional dentifrice, it is possible to produce a dentifrice in a solid form that has never been seen before, and its appearance can be freely set, which improves customer appeal with its excellent appearance.Furthermore, the distribution form can be freely selected, contributing to improved commercial value.Furthermore, since a feel of use that is not inferior to that of ordinary dentifrice can be ensured, new demand for dentifrice can be discovered, and the dentifrice has excellent commercial value.In addition, since agar is naturally derived and easily available, it is safe, inexpensive, and economical.

Claims

1. A dentifrice containing at least water as a base material, a water-soluble solvent, a thickener, and a flavor adjuster, The toothpaste contains 1.5 to 3.0 parts by weight of agar as a solidifying agent for solidifying the toothpaste. A solid toothpaste characterized by:

2. 2. The solid dentifrice according to claim 1, wherein the water-soluble solvent comprises one or more of glycerin, polyethylene glycol, and ethanol.

3. 3. The solid dentifrice according to claim 1, further comprising silica.

4. 3. The solid dentifrice according to claim 1, which does not contain silica.

5. 3. The solid dentifrice according to claim 1, wherein the foaming agent is contained in an amount of not more than 2.0 parts by weight.

6. 4. The solid dentifrice according to claim 3, wherein the foaming agent is contained in an amount of not more than 2.0 parts by weight.

7. 5. The solid dentifrice according to claim 4, wherein the foaming agent is contained in an amount of not more than 2.0 parts by weight.

8. 3. The solid dentifrice according to claim 1, which does not contain a foaming agent.

9. 4. The solid dentifrice according to claim 3, which does not contain a foaming agent.

10. 5. The solid dentifrice according to claim 4, which does not contain a foaming agent.

11. 3. The solid dentifrice according to claim 1, further comprising an abrasive.

12. 4. The solid dentifrice according to claim 3, which contains an abrasive.

13. 5. The solid dentifrice according to claim 4, which contains an abrasive.

14. 6. The solid dentifrice according to claim 5, which contains an abrasive.

15. 7. The solid dentifrice according to claim 6, which contains an abrasive.

16. 8. The solid dentifrice according to claim 7, which contains an abrasive.

17. 9. The solid dentifrice according to claim 8, which contains an abrasive.

18. 10. The solid dentifrice according to claim 9, which contains an abrasive.

19. 11. The solid dentifrice according to claim 10, which contains an abrasive.

20. 3. The solid dentifrice according to claim 1, wherein the solid dentifrice does not adhere to each other when left standing for one month in an environment of 40°C and 75% humidity.

21. 4. The solid dentifrice according to claim 3, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

22. 5. The solid dentifrice according to claim 4, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

23. 6. The solid dentifrice according to claim 5, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

24. 7. The solid dentifrice according to claim 6, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

25. 8. The solid dentifrice according to claim 7, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

26. 9. The solid dentifrice according to claim 8, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

27. 10. The solid dentifrice according to claim 9, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

28. 11. The solid dentifrice according to claim 10, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

29. 12. The solid dentifrice according to claim 11, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

30. 13. The solid dentifrice according to claim 12, wherein the solid dentifrice does not adhere to itself when left standing for one month in an environment of 40°C and 75% humidity.

31. 14. The solid dentifrice according to claim 13, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

32. 15. The solid dentifrice according to claim 14, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

33. 16. The solid dentifrice according to claim 15, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

34. 17. The solid dentifrice according to claim 16, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

35. 18. The solid dentifrice according to claim 17, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

36. 19. The solid dentifrice according to claim 18, wherein the solid dentifrice does not adhere to each other when left standing for one month in an environment of 40°C and 75% humidity.

37. 20. The solid dentifrice according to claim 19, wherein the solid dentifrice does not stick together when left standing for one month in an environment of 40°C and 75% humidity.

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