Dentifrice composition

Abstract

The present invention addresses the problem of requiring further improvement in the dispersibility and brushing feeling of a dentifrice composition. The purpose of the present invention is to provide a dentifrice composition capable of further improving dispersibility, brushing feeling, and foam durability, the dentifrice composition containing component (A): a silica particle group, component (B): an acrylic polymer compound, component (C): a thickener (excluding component (B)), and component (D): a surfactant, the mass ratio (B / C ratio) of the content of the component (B) to the content of the component (C) is 1.5-7.

Description

Technical Field

[0001] The present invention relates to a dentifrice composition. This application claims priority based on Japanese Patent Application No. 2024-003504 filed in Japan on January 12, 2024, and Japanese Patent Application No. 2024-203335 filed in Japan on November 21, 2024, the contents of which are incorporated herein by reference. Background Art

[0002] For dentifrice compositions, in addition to the requirements for preventing diseases such as dental caries and periodontal diseases, palatability based on the brushing feeling and fragrance is also required. So far, proposals for dentifrice compositions that can improve the brushing feeling have been made. For example, in Patent Document 1, a dentifrice composition containing anhydrous silicic acid, calcium carbonate, and calcium hydrogen phosphate is proposed. According to the invention described in Patent Document 1, the brushing feeling can be improved. In Patent Document 2, a dentifrice composition containing one or more selected from erythritol, sorbitol, and glycerin, and one or more selected from polyolefin resins and polyamide resins is proposed. According to the invention described in Patent Document 2, the refreshing feeling in the oral cavity can be improved. In Patent Document 3, a dentifrice composition containing zeolite particles having a specific particle size and disintegration strength, cajeputol, and one or more selected from vanillin, ethyl vanillin, maltol, and ethyl maltol is proposed. According to the invention described in Patent Document 3, the usability of the brushing feeling in the oral cavity can be improved. Prior Art Documents Patent Documents

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-104376 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-068599 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-266251 Summary of the Invention Problems to be Solved by the Invention

[0004] There is a need to further improve the dispersibility, brushing feeling, and foam persistence of dentifrice compositions. In addition, it is also required that the dentifrice composition enhances the cooling sensation. In view of the above circumstances, an object of the present invention is to provide a dentifrice composition that can further improve dispersibility, brushing feeling, and foam persistence. Means for Solving the Problems

[0005] The present invention has the following aspects. <1>A dentifrice composition containing component (A): a group of silica particles; component (B): an acrylic polymer compound; component (C): a thickener (excluding component (B)); and component (D): a surfactant. The mass ratio (B / C ratio) of the content of component (B) to the content of component (C) is 1.5 to 7. <2>The dentifrice composition according to <1>, wherein the BET specific surface area of component (A) is 20 to 100 m 2 / g. <3>Furthermore, the dentifrice composition according to <1> or <2>, further containing component (E): a cooling agent. <4>The dentifrice composition according to any one of <1> to <3>, having a plastic viscosity of 0 to 50 Pa·s. <5>The dentifrice composition according to any one of <1> to <4>, having a yield stress of 20 to 500 Pa. <6>The dentifrice composition according to any one of <1> to <5>, wherein the content of component (A) is 5 to 20% by mass. <7>The dentifrice composition according to any one of <1> to <6>, wherein the content of component (B) is 0.5 to 2.5% by mass. <8>The dentifrice composition according to any one of <1> to <7>, wherein the content of component (C) is 0.3 to 1.0% by mass. Effects of the Invention

[0006] The dentifrice composition according to the present invention can further improve dispersibility, brushing feeling, and foam persistence. In the present invention, "~" indicating a numerical range means that the values described before and after it are also included as the lower limit value and the upper limit value. Detailed Description

[0007] (Dentifrice Composition) The dentifrice composition of the present invention is an oral composition containing the following components (A) to (D). The dosage form of the dentifrice composition can be paste-like, gel-like, liquid-like, solid-like, etc. Examples of the dentifrice composition include toothpaste, gel dentifrice, liquid dentifrice, and emollient (semi-paste) dentifrice.

[0008] For toothpaste, the viscosity of the dentifrice composition is preferably, for example, 8 to 25 Pa·s, more preferably 10 to 20 Pa·s. The viscosity of the dentifrice composition is the viscosity at 25°C measured using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., VISCOMETER TVB-10) under the conditions of an H6 rotor, a rotation speed of 20 rpm, and a measurement time of 3 minutes.

[0009] For toothpaste, the plastic viscosity of the dentifrice composition is preferably 0 to 50 Pa·s, more preferably 3 to 30 Pa·s, still more preferably 3 to 25 Pa·s, and particularly preferably 10 to 20 Pa·s. The plastic viscosity can be adjusted by the combination of the type and content of the component (C) described below, and the type or content of the component (B) described below. For toothpaste, the yield stress of the dentifrice composition is preferably 20 to 500 Pa, more preferably 40 to 400 Pa, still more preferably 40 to 300 Pa, and particularly preferably 100 to 300 Pa. The plastic viscosity can be adjusted by the combination of the type and content of the component (B) described below, and the type or content of the component (C) described below. If the plastic viscosity and the yield stress are within the above ranges, the dispersibility can be further improved. The plastic viscosity and the yield stress refer to the value of the shear stress (Pa) of the dentifrice composition measured using a rheometer (manufactured by Anton Paar GmbH, viscoelastic measuring device (MCR302), using CP-50 (conical plate with a diameter of 5 cm)) with respect to the shear rate of 0.3 to 1.5 (1 / s).

[0010] For toothpaste, the water content of the dentifrice composition is preferably, for example, 10 to 60% by mass, more preferably 20 to 50% by mass. If the water content is above the lower limit value, the generation of fragrance can be further improved. If the water content is below the upper limit value, the dispersibility can be further improved.

[0011] <Component (A)> Component (A) is a group of silica particles (powdered silica). By containing component (A), the brushing feeling of the dentifrice composition can be enhanced.

[0012] The average particle size of component (A) is preferably, for example, 1 to 15 μm, more preferably 3 to 15 μm, still more preferably 5 to 12 μm. If the average particle size of component (A) is above the lower limit value, the brushing feeling can be further enhanced. If the average particle size of component (A) is below the upper limit value, the physical irritation (crunchy feeling) in the oral cavity can be moderately reduced, and the brushing feeling can be further enhanced. The average particle diameter of the component (A) is the volume-average median diameter (d50) measured using a particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., Microtrac particle size analyzer, dispersant: water).

[0013] The BET specific surface area of the component (A) is preferably, for example, 20 to 100 m 2 / g, more preferably 20 to 90 m 2 / g, and even more preferably 20 to 80 m 2 / g. If the BET specific surface area of the component (A) is above the lower limit value, the scrubbing feeling can be further enhanced. If the BET specific surface area of the component (A) is below the upper limit value, the dispersibility can be further improved. The BET specific surface area of the component (A) is a value measured by the nitrogen adsorption method. In addition, particularly, the silica particle group having the specific BET specific surface area is sometimes referred to as a specific silica particle group.

[0014] With respect to the total mass of the component (A), the proportion of the specific silica particle group is preferably 5% by mass or more, more preferably 10% by mass or more, and may be 100% by mass. If the proportion of the specific silica particle group is above the lower limit value, the scrubbing feeling can be further enhanced.

[0015] The water absorption of the component (A) is preferably, for example, 0.1 to 1 cm 3 / g, more preferably 0.2 to 0.9 cm 3 / g, and even more preferably 0.3 to 0.8 cm 3 / g. If the water absorption of the component (A) is above the lower limit value, the scrubbing feeling can be further enhanced. If the water absorption of the component (A) is below the upper limit value, the dispersibility can be further improved. The water absorption of the component (A) is a value measured according to the Chinese enterprise standard (QB / T2346).

[0016] Examples of the component (A) include, for example, ZEODENT 103 (trade name, manufactured by EVONIK Corporation), etc. The component (A) may be a single type or a combination of two or more types.

[0017] With respect to the total mass of the dentifrice composition, the content of component (A) is preferably 5% by mass or more, more preferably 7% by mass or more, and still more preferably 10% by mass or more. If the content of component (A) is above the lower limit value, the brushing feeling can be further enhanced. With respect to the total mass of the dentifrice composition, the lower limit value of the content of component (A) is preferably 20% by mass or less, more preferably 18% by mass or less, and still more preferably 15% by mass or less. If the content of component (A) is below the upper limit value, the physical properties of the dentifrice composition can be softened and the dispersibility can be further improved. (A) The content range of the component can appropriately combine the lower limit value and the upper limit value.

[0018] <(Component B)> (B) Component is an acrylic polymer compound. By containing component (B), the brushing feeling of the dentifrice composition can be improved. In addition, when used in combination with component (E) described later, the cooling feeling can be further enhanced.

[0019] Examples of component (B) include polyacrylic acid and its salts. Component (B) can be crosslinked or non-crosslinked. Examples of the salt type of component (B) include alkali metal salts such as sodium salt. Examples of component (B) include, for example, crosslinked sodium polyacrylate (Aqupec-MG, manufactured by Sumitomo Seika Chemicals Co., Ltd.), Junlon PW-120, Junlon PW-121, Junlon PW-312S, Rheogic 260H, Rheogic 262L (the above are manufactured by Toagosei Co., Ltd.), sodium polyacrylate (manufactured by Polysciences, Inc., etc.). (B) Component can be a single kind or a combination of two or more kinds.

[0020] With respect to the total mass of the dentifrice composition, the content of component (B) is preferably 0.5% by mass or more, more preferably 0.6% by mass or more, and still more preferably 1% by mass or more. If the content of component (B) is above the lower limit value, the brushing feeling can be further enhanced. With respect to the total mass of the dentifrice composition, the upper limit value of the content of component (B) is preferably 2.5% by mass or less, more preferably 2% by mass or less, and still more preferably 1.8% by mass or less. If the content of component (B) is below the upper limit value, the physical properties of the dentifrice composition can be softened and the dispersibility can be further improved. In addition, if the content of component (B) is below the upper limit value, the brushing feeling can be further enhanced and the cooling feeling can be further improved. (B) The content range of the component can appropriately combine the lower limit value and the upper limit value.

[0021] <(Component C)> (C) is a thickening agent (excluding component (B)). By containing component (C), the dentifrice composition can improve dispersibility.

[0022] Examples of component (C) include cellulose thickeners and polysaccharide thickeners. Examples of the cellulose thickener include carboxymethyl cellulose (CMC) or its salts. Examples of the salt of CMC include sodium CMC. Examples of the polysaccharide thickener include xanthan gum, carrageenan, gellan gum, guar gum, tragacanth gum, karaya gum, gum arabic, and locust bean gum. Among them, as component (C), CMC, CMC salts, xanthan gum, and carrageenan are preferred.

[0023] Examples of component (C) include sodium carboxymethyl cellulose (SUNROWS, manufactured by Nippon Paper Industries Co., Ltd.), CMCDaicel (manufactured by Daicel Miraizu Co., Ltd.), Cellogen (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), etc. These component (C) can be a single type or a combination of two or more types.

[0024] With respect to the total mass of the dentifrice composition, the content of component (C) is preferably 0.3% by mass or more, more preferably 0.4% by mass or more, and further preferably 0.5% by mass or more. When the content of component (C) is above the lower limit value, the amount of foam increases, and the fragrance and cooling sensation are further improved. In addition, when the content of component (C) is above the lower limit value, when used in combination with component (E), the cooling sensation is further improved. In addition, when the content of component (C) is above the lower limit value, the persistence of the foam is improved. With respect to the total mass of the dentifrice composition, the upper limit value of the content of component (C) is preferably 1.0% by mass or less, more preferably 0.9% by mass or less, and further preferably 0.8% by mass or less. When the content of component (C) is below the upper limit value, the brushing feeling can be further improved. In addition, when the content of component (C) is below the upper limit value, the irritation can be alleviated, and when used in combination with component (E), the cooling sensation can be further improved. In addition, when the content of component (C) is below the upper limit value, the dispersibility can be improved. The content range of component (C) can appropriately combine the lower limit value and the upper limit value.

[0025] The mass ratio of the content of component (B) to the content of component (C) (B / C ratio) is preferably 1.5 to 7, more preferably 1.5 to 5, and further preferably 2 to 4. When the B / C ratio is above the lower limit value, the dispersibility can be further improved. When the B / C ratio is below the upper limit value, the foam persistence can be improved, and the brushing feeling can be further enhanced.

[0026] <(D) component> (D) The component is a surfactant. By containing the (D) component, the dentifrice composition can improve foaming properties and enhance the brushing feeling.

[0027] Examples of the (D) component include anionic surfactants, nonionic surfactants, and amphoteric surfactants.

[0028] Examples of the anionic surfactant include alkyl sulfates (e.g., sodium dodecyl sulfate (SDS)), α-olefin sulfonates (AOS), lauroyl methyl taurates (LMT), sulfosuccinates, GluNa, alaninates, etc. The alkyl and acyl groups can be either straight-chain or branched, and can be either saturated or unsaturated. The number of carbon atoms of the alkyl or acyl group is preferably, for example, 10 to 20, more preferably 12 to 18, and further preferably 14 to 16. The salt can be selected from pharmaceutically acceptable salts. Examples of pharmaceutically acceptable salts include, for example, base addition salts and amino acid salts. Examples of the salt include inorganic base salts such as sodium salt, potassium salt, calcium salt, magnesium salt, ammonium salt, etc.; organic base salts such as triethylammonium salt, triethanolammonium salt, pyridinium salt, diisopropylammonium salt, etc.; and basic amino acid salts such as arginine salt. Among them, inorganic base salts are preferred, alkali metal salts (e.g., sodium salt, potassium salt) or ammonium salt are more preferred, and sodium salt is further preferred.

[0029] As nonionic surfactants, polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oils, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters (e.g., polyoxyethylene sorbitan monostearate), alkylolamides, polyoxyethylene fatty acid esters, polyoxyethylene alkenyl ethers, glycerol fatty acid esters, sucrose fatty acid esters (e.g., maltose fatty acid ester), sugar alcohol fatty acid esters (e.g., maltitol fatty acid ester, lactitol fatty acid ester), fatty acid diethanolamides (e.g., lauric acid mono- or diethanolamide), polyoxyethylene-polyoxypropylene copolymers, polyoxyethylene-polyoxypropylene fatty acid esters, polyoxyethylene-polyoxypropylene (EOPO) copolymers, alkyl glucosides, and polyglycerol fatty acid esters can be mentioned. The alkyl carbon atoms of polyoxyethylene alkyl ethers are usually 12 to 18, preferably 14 to 18 (e.g., dodecyl, octadecyl), and the average number of moles of ethylene oxide added is usually 5 to 30 moles, preferably 15 to 30 moles. The average number of moles of ethylene oxide added to polyoxyethylene hydrogenated castor oil is usually 5 to 100 moles, preferably 20 to 100 moles, more preferably 20 to 60 moles. The fatty acid carbon atoms of sorbitan fatty acid esters are usually 12 to 18. The fatty acid carbon atoms of polyoxyethylene sorbitan fatty acid esters are usually 16 to 18, and the average number of moles of ethylene oxide added is usually 10 to 40 moles. The alkyl chain carbon atoms of alkylolamides are usually 12 to 14. The polyoxyethylene-polyoxypropylene (EOPO) copolymer is preferably a copolymer with an average number of moles of ethylene oxide added of 20 to 210 and an average number of moles of propylene oxide added of 15 to 60, which can be a block copolymer or a random copolymer.

[0030] As amphoteric surfactants, for example, betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants can be mentioned. As betaine-type amphoteric surfactants, for example, fatty acid amide propyl betaines (e.g., cocoamido propyl betaine), alkyl acetic acid betaines (e.g., alkyl amino acetic acid betaines such as dodecyl dimethyl amino acetic acid betaine), and alkyl imidazoline betaines (e.g., alkyl carboxymethyl hydroxyethyl imidazoline betaine) can be mentioned. Among them, fatty acid amide propyl betaines and alkyl acetic acid betaines are preferred, and cocoamido propyl betaine is more preferred. When the amphoteric surfactant has an alkyl or acyl group, they can be either straight-chain or branched-chain, and the alkyl or acyl group can be either saturated or unsaturated. The carbon atoms of the alkyl or acyl group are preferably 10 to 20, more preferably 12 to 18, and further preferably 14 to 16.

[0031] As the component (D), anionic surfactants and amphoteric surfactants are preferred, and SDS, AOS, LMT, sulfosuccinate salts, GluNa, alanine esters, and fatty acid amide propyl betaines are more preferred, and SDS, AOS, LMT, and fatty acid amide propyl betaines are even more preferred.

[0032] With respect to the total mass of the dentifrice composition, the content of component (D) is preferably 1.0% by mass or more, more preferably 1.2% by mass or more. If the content of component (D) is at or above the lower limit value, the amount of bubbles can be increased, and the brushing feeling can be further improved. The upper limit value of the content of component (D) is preferably 2.0% by mass or less, more preferably 1.8% by mass or less. If the content of component (D) is at or below the upper limit value, the irritation can be reduced, and the brushing feeling can be further improved. The content range of component (D) may appropriately combine the lower limit value and the upper limit value.

[0033] <Any component> The dentifrice composition may contain any component other than components (A) to (D). Examples of the optional component include a cooling agent ((E) component), a humectant, a solvent, a medicinal ingredient, a sweetening agent, a fragrance (excluding the (E) component), a pH adjuster, a preservative, a colorant, a suspending agent, a functional ingredient, a flavoring agent, etc.

[0034] Examples of the (E) component include, for example, L-menthol, N-ethyl-L-menthylcarboxamide (N-ETHYL-2-ISOPROPYL-5-METHYLCYCLOHEXANECARBOXAMIDE), isopulegol, monomenthyl succinate, N-(2-hydroxy-2-phenylethyl)-2-isopropyl-5,5-dimethylcyclohexane-1-carboxamide, N-(ethoxycarbonylmethyl)-p-menthane-3-carboxamide (N-[(ETHOXYCARBONYL)METHYL]-p-MENTHANE-3-CARBOXAMIDE), N-p-benzeneacetonitrile menthane carboxamide (N-p-BENZENEACETONITRILEMENTHANECARBOXAMIDE), N-(2-(pyridin-2-yl)ethyl)-p-menthane carboxamide (N-(2-(PYRIDIN-2-YL)ETHYL)-3-p-MENTHANECARBOXAMIDE), 3-1-methoxypropane-2,2-diol, menthyl lactate, and preferably L-menthol, N-ethyl-L-menthylcarboxamide (N-ETHYL-2-ISOPROPYL-5-METHYLCYCLOHEXANE CARBOXAMIDE), isopulegol, monomenthyl succinate, N-(2-hydroxy-2-phenylethyl)-2-isopropyl-5,5-dimethylcyclohexane-1-carboxamide, etc. The content of the (E) component is, for example, 0.001 to 2% by mass of the total mass of the dentifrice composition.

[0035] As wetting agents, sugar alcohols such as sorbitol, xylitol, erythritol, glycerin, propylene glycol, polyalkylene glycols (PEG), etc. can be mentioned.

[0036] As solvents, refined water, lower alcohols having 1 to 3 carbon atoms such as ethanol, etc. can be mentioned.

[0037] As medicinal components, for example, fluorine-containing compounds such as sodium monofluorophosphate, sodium fluoride, stannous fluoride, etc.; water-soluble phosphoric acid compounds such as potassium salts and sodium salts of orthophosphoric acid; allantoin or its derivatives such as allantoin and allantoin aluminum chlorhydroxide; enzymes such as dextranase, mutanase, protease, etc.; copper compounds such as copper gluconate; chelating phosphoric acid compounds such as glycerophosphate; cationic germicides such as cetylpyridinium chloride, benzethonium chloride, benzalkonium chloride, etc.; nonionic germicides such as isopropylmethylphenol, triclosan, etc.; angelica extract; extracts of phellodendron bark, chamomile, clove, rosemary, scutellaria, safflower, etc.; tranexamic acid, hinokitiol, sodium chloride, Dl-α-tocopherol acetate, coenzyme Q10, dihydrocholesterol, α-bisabolol, chlorhexidine salts, triclosan, sanguinarine extract, azulene, glycyrrhizin, glycyrrhetinic acid, sodium copper chlorophyllin, chlorophyll, strontium chloride, berberine, hydroxamic acid and its derivatives, pyrophosphates, tripolyphosphates, water-soluble metaphosphates, zeolites, methyl vinyl ether maleic anhydride copolymers, epi-dihydrocholesterol, triclocarban, zinc citrate. These medicinal components can be a single kind alone or a combination of two or more kinds.

[0038] (Manufacturing method) The manufacturing method of the dentifrice composition of the present invention is not particularly limited, and can be prepared by a conventionally well-known method according to the form and dosage form. For example, when used as toothpaste, a method of dissolving the components soluble in the solvent in the solvent, mixing other insoluble components, and defoaming (for example, under reduced pressure) as needed can be mentioned. In addition, as another example, a method of dispersing the active ingredient and other components used as needed in a solvent (such as water such as refined water, sterile water, etc.) and dissolving them can be mentioned. The obtained dentifrice composition can be accommodated in a container as a product. The shape and material of the container are not particularly limited, and containers usually used for dentifrice compositions can be used. For example, as a container for toothpaste, a laminated tube can be mentioned. As its material, plastics such as polyethylene, polypropylene, polyethylene terephthalate, nylon, etc. can be mentioned.

[0039] As a method of using the dentifrice composition of the present embodiment, for example, a method of placing an appropriate amount of the dentifrice composition on a toothbrush, brushing the tooth surface, and rinsing with water after use can be mentioned. The single dose of the dentifrice composition for the oral cavity can be the same as the usual dose corresponding to the dosage form, for example, about 0.5 to 1.5 g.

[0040] As described above, the dentifrice composition according to the present invention contains components (A) to (D) and has a B / C ratio within a specific range, so that the dispersibility, brushing feeling, and foam persistence can be further improved.

Examples

[0041] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following description.

[0042] (Raw materials used) <Component (A)> ·Silica a1-1: ZEODENT 103 (trade name), manufactured by EVONIK Corporation, average particle size = 10 μm, BET specific surface area = 50 m 2 / g, water absorption = 0.6 cm 3 / g. ·Silica a1-2: ABSIL-HC (trade name), manufactured by Madhu Silica Co., Ltd., average particle size = 10 μm, BET specific surface area = 50 m 2 / g, water absorption = 0.6 cm 3 / g. ·Silica a2: NIPGEL AY-002 (trade name), manufactured by Tosoh Silica Corporation, average particle size = 150 μm, BET specific surface area = 400 m 2 / g, water absorption = 5.0 cm 3 / g.

[0043] <Component (B)> ·Sodium polyacrylate b-1: Aqupec-MG (trade name), manufactured by Sumitomo Seika Chemical Co., Ltd. ·Sodium polyacrylate b-2: Rheogic-260H (trade name), manufactured by Toagosei Co., Ltd.

[0044] <Component (C)> ·Xanthan gum: Mondard Gum DA (trade name), manufactured by CP Kelco.

[0045] <Component (D)> ·Sodium lauryl sulfate: SLS (trade name), manufactured by Nikko Chemicals Co., Ltd.

[0046] <Component (E)> ·L-menthol: L-menthol (trade name), manufactured by Takasago International Corporation.

[0047] <Others> ·Sorbitol: NEOSORB (trade name), manufactured by Roquette, 70% sorbitol. · Humectant: Propylene glycol. · Active ingredient: Sodium fluoride. · Flavor: Other flavors (excluding (E) components). · Water: Purified water.

[0048] (Method for measuring physical properties) <Plastic viscosity, yield stress> Using a viscoelasticity measuring device (manufactured by Anton Paar MCR302), the measured values of "shear rate - shear stress" are substituted into the coagulation-dispersion system analysis formula (the following Casson equation) to calculate the plastic viscosity and yield stress. The measurement is carried out using a 5-cm diameter conical plate (CP50-1) in the shear rate range of 0.3 to 1.5. Casson equation: Tau 1 / 2 = k0 + k1 * Gp 1 / 2 (Tau: Shear stress, Gp: Shear rate, k0: Yield stress, k1: Plastic viscosity)

[0049] (Evaluation method) Ten testers place 1 g of the dentifrice composition on a toothbrush (Clinica Advantage toothbrush, 4-row compact regular type, manufactured by Lion Corporation) and brush their teeth in the mouth for 3 minutes. The dispersibility, brushing feeling, foam persistence, and cooling feeling of the dentifrice composition during brushing are evaluated according to the following evaluation criteria. The average score of the 10 people is calculated and judged according to the following judgment criteria.

[0050] <Dispersibility> <<Evaluation criteria>> 4 points: Very good dispersibility in the mouth (no lumps remaining). 3 points: Good dispersibility in the mouth (slightly uneven part with lumps remaining). 2 points: Poor dispersibility in the mouth (lumps remaining in the mouth). 1 point: Very poor dispersibility in the mouth (large lumps remaining).

[0051] <<Judgment criteria>> A: Average score above 3.5. B: Average score above 3.0 and less than 3.5. C: Average score above 2.0 and less than 3.0. D: Average score less than 2.0.

[0052] <Brushing feeling> <<Evaluation criteria>> 4 points: Strong brushing feeling. 3 points: There is a brushing feeling. 2 points: Slight (weak) brushing feeling. 1 point: No brushing feeling.

[0053] <<Judgment Criteria>> A: Average score above 3.5. B: Average score above 3.0 and less than 3.5. C: Average score above 2.0 and less than 3.0. D: Average score less than 2.0.

[0054] <Cooling Sensation> <<Evaluation Criteria>> 4 points: Strong cooling sensation. 3 points: Having a cooling sensation. 2 points: Slight cooling sensation. 1 point: No cooling sensation.

[0055] <<Judgment Criteria>> A: Average score above 3.5. B: Average score above 3.0 and less than 3.5. C: Average score above 2.0 and less than 3.0. D: Average score less than 2.0.

[0056] <Foam Persistence> <<Evaluation Criteria>> 4 points: There is sufficient foam residue. 3 points: There is some foam residue. 2 points: There is almost no foam residue. 1 point: There is no foam residue.

[0057] <<Judgment Criteria>> A: Average score above 3.5. B: Average score above 3.0 and less than 3.5. C: Average score above 2.0 and less than 3.0. D: Average score less than 2.0.

[0058] (Examples 1 - 11, Comparative Examples 1 - 3) Prepare dentifrice compositions (toothpaste) with the compositions shown in Tables 1 - 2 by conventional methods. Fill 50 g of the obtained dentifrice composition into a laminated tube, and evaluate the dispersibility, brushing feeling, foam persistence, and cooling sensation by the above evaluation methods. The results are shown in the table. In addition, the mixing amounts in the table are values converted to pure amounts. Components for which the mixing amounts are not recorded in the table are not mixed. In the table, the mixing amount of purified water "the remaining part (balance)" is the amount required to make the total mass of the dentifrice composition reach 100% by mass.

[0059]

Table 1

[0060]

Table 2

[0061] As shown in Table 1, the evaluations of the dispersibility, brushing feeling, foam persistence, and cool feeling of Examples 1 to 11 were “A” or “B”. The evaluations of the dispersibility of Comparative Examples 1 and 2 with a B / C ratio of 0.3 were “D”. The evaluation of the foam persistence of Comparative Example 3 with a B / C ratio of 9.0 was “D”. Based on the above results, it was confirmed that the dispersibility, brushing feeling, and foam persistence could be improved by applying the present invention.

Claims

1. A dentifrice composition comprising component (A): a group of silica particles; component (B): an acrylic polymer compound; component (C): a thickener excluding component (B); and component (D): a surfactant; The mass ratio of the content of component (B) to the content of component (C), i.e., the B / C ratio, is 1.5 to 7.

2. The dentifrice composition according to claim 1, wherein The average particle size of component (A) is 1 to 15 μm.

3. The dentifrice composition according to claim 1, wherein, The BET specific surface area of the component (A) is 20 to 100 m 2 / g.

4. The dentifrice composition according to claim 1, wherein The proportion of silica particle groups having a BET specific surface area of 20 to 100 m 2 / g is 10% by mass or more relative to the total mass of the component (A).

5. The dentifrice composition according to claim 1, wherein, The water absorption of the component (A) measured according to QB / T2346 is 0.2 to 0.9 cm 3 / g.

6. The dentifrice composition according to claim 1, wherein Based on the total mass of the dentifrice composition, the content of component (A) is 5 to 20% by mass.

7. The dentifrice composition according to claim 1, wherein, Based on the total mass of the dentifrice composition, the content of component (B) is 0.5 to 2.5% by mass.

8. The dentifrice composition according to claim 1, wherein, Component (B) is polyacrylic acid and its salts.

9. The dentifrice composition according to claim 1, wherein, Based on the total mass of the dentifrice composition, the content of component (C) is 0.3 to 1.0% by mass.

10. The dentifrice composition according to claim 1, wherein, The B / C ratio is 2 to 4.

11. The dentifrice composition according to any one of claims 1 to 10, wherein, It further contains component (E): a cooling agent.

12. The dentifrice composition according to any one of claims 1 to 10, having a plastic viscosity of 0 to 50 Pa·s.

13. The dentifrice composition according to any one of claims 1 to 10, having a yield stress of 20 to 500 Pa.

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