Dentifrice composition

Abstract

To provide a dentifrice composition having further improved dispersibility, brushing feel, and foam persistence, in view of a situation in which further improvement in dispersibility and brushing feel is demanded in conventional dentifrice compositions.SOLUTION: A dentifrice composition contains: a component (A) which is a group of silica particles; a component (B) which is an acrylic polymer; a component (C) which is a thickener excluding the component (B); and a component (D) which is a surfactant, wherein a mass ratio (B / C ratio) of a content of the component (B) to a content of the component (C) is from 1.5 to 7.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a dentifrice composition.

Background Art

[0002] For dentifrice compositions, in addition to preventing diseases such as dental caries and periodontal diseases, palatability due to the feel of brushing and flavor is required. So far, dentifrice compositions with improved feel of brushing have been proposed. For example, Patent Document 1 proposes a dentifrice composition containing silicic anhydride, calcium carbonate, and calcium hydrogen phosphate. According to the invention described in Patent Document 1, an improvement in the feeling of brushing has been achieved. Patent Document 2 proposes a dentifrice composition containing one or more selected from erythritol, sorbitol, and glycerin, and one or more selected from polyolefin resins and polyamide resins. According to the invention described in Patent Document 2, an improvement in the refreshing feeling in the oral cavity has been achieved. Patent Document 3 proposes a dentifrice composition containing granular zeolite having a specific particle size and disintegration strength, viridiflorol, and one or more selected from vanillin, ethyl vanillin, maltol, and ethyl maltol. According to the invention described in Patent Document 3, an improvement in the feeling of brushing and the feeling of use in the mouth has been achieved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a demand for further improvement in the dispersibility, brushing feeling, and foam persistence of dentifrice compositions. In addition, there is a demand for improvement in the cooling feeling of dentifrice compositions. The present invention has been made in view of the above circumstances, and aims at a dentifrice composition capable of further enhancing the dispersibility, brushing feeling, and foam persistence.

Means for Solving the Problems

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

Effects of the Invention

[0006] According to the dentifrice composition of the present invention, dispersibility, brushing feeling, and foam persistence can be further enhanced. In the present invention, "~" indicating a numerical range means including the numerical values described before and after it as the lower limit value and the upper limit value.

Embodiments for Carrying Out the Invention

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

[0008] In the case of 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 under the conditions of using an H6 rotor, a rotation speed of 20 rpm, and a measurement time of 3 minutes with a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., VISCOMETER TVB-10).

[0009] In the case of 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 component (C) described later and the type or content of component (B) described later. In the case of 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 component (B) described later and the type or content of component (C) described later. When the plastic viscosity and the yield stress are within the above ranges, the dispersibility can be further enhanced. The plastic viscosity and the yield stress are values obtained by measuring the shear stress (Pa) of the dentifrice composition with respect to a shear rate of 0.3 to 1.5 (1 / s) using a rheometer (manufactured by Anton Paar GmbH, viscoelastic measuring device (MCR302), CP-50 (cone plate with a diameter of 5 cm)).

[0010] In the case of a toothpaste, the water content of the dentifrice composition is preferably, for example, 10 to 60% by mass, more preferably 20 to 50% by mass. When the water content is at least the above lower limit value, the flavor intensity can be further enhanced. When the water content is at most the above upper limit value, the dispersibility can be further enhanced.

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

[0012] The average particle diameter of component (A) is preferably, for example, 1 to 15 μm, more preferably 3 to 15 μm, and even more preferably 5 to 12 μm. When the average particle diameter of component (A) is at least the above lower limit value, a further improvement in the brushing feeling can be achieved. When the average particle diameter of component (A) is at most the above upper limit value, the physical irritation (gritty feeling) in the oral cavity can be moderately weakened to further improve the brushing feeling. The average particle diameter of component (A) is the median diameter (d50) using volume average, which is measured by a particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., Microtrac particle size distribution analyzer, dispersion medium; water).

[0013] The BET specific surface area of component (A) is, for example, 20 to 100 m 2 / g is preferable, 20 to 90 m 2 / g is more preferable, 20 to 80 m 2 / g is even more preferable. When the BET specific surface area of component (A) is at least the above lower limit value, a further improvement in the brushing feeling can be achieved. When the BET specific surface area of component (A) is at most the above upper limit value, a further improvement in the dispersibility can be achieved. The BET specific surface area of component (A) is a value measured by the nitrogen adsorption method. Incidentally, the group of silica particles with the specific BET specific surface area described above may be particularly referred to as a specific silica particle group.

[0014] With respect to the total mass of the component (A), the ratio 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. When the ratio of the specific silica particle group is at least the above lower limit, a further improvement in the brushing feeling can be achieved.

[0015] The water absorption of the component (A) is, for example, preferably 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. When the water absorption of the component (A) is at least the above lower limit, a further improvement in the brushing feeling can be achieved. When the water absorption of the component (A) is at most the above upper limit, a further improvement in dispersibility can be achieved. 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 ZEODENT103 (trade name, manufactured by EVONIK) and the like. The component (A) may be used alone or in combination of two or more.

[0017] The content of the component (A) is preferably 5% by mass or more, more preferably 7% by mass or more, and even more preferably 10% by mass or more with respect to the total mass of the dentifrice composition. When the content of the component (A) is at least the above lower limit, a further improvement in the brushing feeling can be achieved. The lower limit of the content of the component (A) is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 15% by mass or less with respect to the total mass of the dentifrice composition. When the content of the component (A) is at most the above upper limit, the physical properties of the dentifrice composition can be softened and a further improvement in dispersibility can be achieved. The range of the content of the component (A) can be appropriately combined with the above lower limit and upper limit.

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

[0019] Examples of the (B) component include polyacrylic acid and its salts. The (B) component may be cross-linked or non-cross-linked. Examples of the salt-type (B) component include alkali metal salts such as sodium salt. Examples of the (B) component include, for example, cross-linked sodium polyacrylate (Acpek-MG, manufactured by Sumitomo Seika Chemical Co., Ltd.), Junron PW-120, Junron PW-121, Junron PW-312S, Reodigic 260H, Reodigic 262L (manufactured by Toagosei Co., Ltd. above), sodium polyacrylate (manufactured by Polyscience Co., Ltd. etc.). The (B) component may be used alone or in combination of two or more.

[0020] The content of the (B) component is preferably 0.5% by mass or more, more preferably 0.6% by mass or more, and further preferably 1% by mass or more based on the total mass of the dentifrice composition. When the content of the (B) component is at least the above lower limit value, further improvement in the brushing feeling can be achieved. The upper limit value of the content of the (B) component is preferably 2.5% by mass or less, more preferably 2% by mass or less, and further preferably 1.8% by mass or less based on the total mass of the dentifrice composition. When the content of the (B) component is at most the above upper limit value, the physical properties of the dentifrice composition can be softened and further improvement in dispersibility can be achieved. In addition, when the content of the (B) component is at most the above upper limit value, the brushing feeling can be further enhanced and the cooling feeling can be further enhanced. The range of the content of the (B) component can be appropriately combined with the above lower limit value and upper limit value.

[0021] <(C) component> (C) component is a thickener (excluding the (B) component). By containing the (C) component in the dentifrice composition, the dispersibility can be enhanced.

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

[0023] Examples of the component (C) include sodium carboxymethyl cellulose (manufactured by Sanrose, Nippon Paper Industries Co., Ltd.), CMC Daicel (manufactured by Daicel Miraiz Co., Ltd.), Serogen (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), etc. These components (C) may be used alone or in combination of two or more.

[0024] The content of the component (C) is preferably 0.3% by mass or more, more preferably 0.4% by mass or more, and still more preferably 0.5% by mass or more based on the total mass of the dentifrice composition. When the content of the component (C) is at least the above lower limit value, the amount of foam increases, and the flavor and cool feeling are further enhanced. In addition, when the content of the component (C) is at least the above lower limit value, the cool feeling can be further enhanced when used in combination with the component (E). Furthermore, when the content of the component (C) is at least the above lower limit value, the foam persistence can be enhanced. The upper limit value of the content of the component (C) is preferably 1.0% by mass or less, more preferably 0.9% by mass or less, and still more preferably 0.8% by mass or less based on the total mass of the dentifrice composition. When the content of the component (C) is at most the above upper limit value, further improvement in the brushing feeling can be achieved. In addition, when the content of the component (C) is at most the above upper limit value, the irritation is alleviated, and the cool feeling can be further enhanced when used in combination with the component (E). Furthermore, when the content of the component (C) is at most the above upper limit value, the dispersibility can be enhanced. The range of the content of the component (C) can be appropriately combined with the above lower limit value and 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 even more preferably 2 to 4. When the B / C ratio is at least the above lower limit value, the dispersibility can be further enhanced. When the B / C ratio is at most the above upper limit value, the foam persistence is enhanced and the brushing feeling can be further enhanced.

[0026] <Component (D)> Component (D) is a surfactant. By containing component (D), the dentifrice composition has enhanced foaming properties and an enhanced brushing feeling.

[0027] Examples of component (D) 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 taurine (LMT), sulfosuccinic acid, GluNa, alaninate, etc. The alkyl group and acyl group may be either linear or branched, and may be either saturated or unsaturated. The number of carbon atoms of the alkyl group or acyl group is preferably, for example, 10 to 20, more preferably 12 to 18, and even more preferably 14 to 16. The salt may be selected from pharmacologically acceptable salts. Examples of pharmacologically 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 salts are more preferred, and sodium salt is even more preferred.

[0029] Examples of nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters (e.g., polyoxyethylene sorbitan monostearate), alkylolamides, polyoxyethylene fatty acid esters, polyoxyethylene alkenyl ethers, glycerin fatty acid esters, sucrose fatty acid esters (e.g., maltose fatty acid esters), sugar alcohol fatty acid esters (e.g., maltitol fatty acid esters, lactitol fatty acid esters), 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 fatty acid polyglyceryls. The number of carbon atoms in the alkyl group of polyoxyethylene alkyl ethers is usually 12 to 18, preferably 14 to 18 (e.g., lauryl, stearyl groups), 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 number of carbon atoms in the fatty acid of sorbitan fatty acid esters is usually 12 to 18. The number of carbon atoms in the fatty acid of polyoxyethylene sorbitan fatty acid esters is usually 16 to 18, and the average number of moles of ethylene oxide added is usually 10 to 40 moles. The number of carbon atoms in the alkyl chain of alkylolamides is usually 12 to 14. For polyoxyethylene polyoxypropylene (EOPO) copolymers, those 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 are preferred, and they may be block copolymers or random copolymers.

[0030] Examples of the amphoteric surfactant include betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants. Examples of the betaine-type amphoteric surfactant include fatty acid amide propyl betaine (e.g., coconut oil fatty acid amide propyl betaine), alkyl acetic acid betaine (e.g., alkyl amino acetic acid betaine such as lauryl dimethyl amino acetic acid betaine), and alkyl imidazolinium betaine (e.g., alkyl carboxymethyl hydroxyethyl imidazolinium betaine). Among them, fatty acid amide propyl betaine and alkyl acetic acid betaine are preferred, and coconut oil fatty acid amide propyl betaine is more preferred. When the amphoteric surfactant has an alkyl group and an acyl group, they may be either straight-chain or branched-chain, and either saturated or unsaturated for the alkyl group or acyl group. The number of carbon atoms of the alkyl group or acyl group is preferably 10 to 20, more preferably 12 to 18, and even more preferably 14 to 16.

[0031] As the component (D), an anionic surfactant and an amphoteric surfactant are preferred, SDS, AOS, LMT, sulfosuccinic acid, GluNa, alaninate, and fatty acid amide propyl betaine are preferred, and SDS, AOS, LMT, and fatty acid amide propyl betaine are more preferred.

[0032] The content of the component (D) is preferably 1.0% by mass or more, more preferably 1.2% by mass or more, based on the total mass of the dentifrice composition. When the content of the component (D) is at least the above lower limit value, the amount of foam can be increased and the brushing feeling can be further enhanced. The upper limit value of the content of the component (D) is preferably 2.0% by mass or less, more preferably 1.8% by mass or less. When the content of the component (D) is at most the above upper limit value, the irritation can be reduced and a further improvement in the brushing feeling can be achieved. The range of the content of the component (D) can be appropriately combined with the above lower limit value and upper limit value.

[0033] <Optional component> The dentifrice composition may contain optional components other than the components (A) to (D). Examples of optional components 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 coloring agent, a suspending agent, a functional ingredient, a flavoring ingredient, and the like.

[0034] Examples of the (E) component include, for example, L-menthol, N-ETHYL-2-ISOPROPYL-5-METHYLCYCLOHEXANE CARBOXAMIDE, isopulegol, monomethyl succinate menthyl ester, N-(2-HYDROXY-2-PHENYLETHYL)-2-ISOPROPYL-5,5-DIMETHYLCYCLOHEXANE-1-CARBOXAMIDE, N-[(ETHOXYCARBONYL)METHYL]-p-MENTHANE-3-CARBOXAMIDE, N-p-BENZENEACETONITRILEMENTHANECARBOXAMIDE, N-(2-(PYRIDIN-2-YL)ETHYL)-3-p-MENTHANECARBOXAMIDE, 3-1-METHOXYPROPAN-1,2-DIOL, menthyl lactate, and preferably, L-menthol, N-ETHYL-2-ISOPROPYL-5-METHYLCYCLOHEXANE CARBOXAMIDE, isopulegol, monomethyl succinate menthyl ester, N-(2-HYDROXY-2-PHENYLETHYL)-2-ISOPROPYL-5,5-DIMETHYLCYCLOHEXANE-1-CARBOXAMIDE, and the like. The content of the (E) component is, for example, 0.001 to 2% by mass based on the total mass of the dentifrice composition.

[0035] Examples of the humectant include sugar alcohols such as sorbitol, xylitol, and erythritol, and polyhydric alcohols such as glycerin, propylene glycol, and polyethylene glycol (PEG).

[0036] Examples of the solvent include purified water and lower alcohols having 1 to 3 carbon atoms such as ethanol.

[0037] Examples of the medicinal ingredients include fluoride-containing compounds such as sodium monofluorophosphate, sodium fluoride, and stannous fluoride; water-soluble phosphate compounds such as potassium salts and sodium salts of orthophosphoric acid; allantoin or its derivatives such as allantoin and allantoin chlorhydroxyaluminum; enzymes such as dextranase, mutanase, and protease; copper compounds such as copper gluconate; chelating phosphate compounds such as glycerophosphate; cationic bactericides such as cetylpyridinium chloride, benzethonium chloride, and benzalkonium chloride; nonionic bactericides such as isopropylmethylphenol and triclosan; licorice soft extract; extracts of peony root, chamomile, clove, rosemary, saffron, and red peony, and 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, pyrophosphate, tripolyphosphate, water-soluble metaphosphate, zeolite, methoxyethylene maleic anhydride copolymer, epidihydrocholesterol, trichlorocarbanilide, and zinc citrate. These medicinal ingredients may be used alone or in combination of two or more.

[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 known method according to the form and dosage form. For example, when used as a paste dentifrice, a method of dissolving the components soluble in the solvent in the solvent, mixing the other insoluble components, and performing defoaming (e.g., under reduced pressure) as necessary can be mentioned. Another example is a method of dispersing and dissolving the active ingredient and other components used as necessary in a solvent (e.g., water such as purified water and sterilized water). The resulting dentifrice composition can be contained in a container to make a product. The shape and material of the container are not particularly limited, and containers used for ordinary dentifrice compositions can be used. For example, as a container for a paste dentifrice, a laminated tube can be mentioned. As the material, for example, plastics such as polyethylene, polypropylene, polyethylene terephthalate, and nylon can be mentioned.

[0039] For example, a method of using the dentifrice composition of the present embodiment includes placing an appropriate amount of the dentifrice composition on a toothbrush, brushing the surface of the teeth, and rinsing with water after use. The appropriate amount of the dentifrice composition applied to the oral cavity each time can be the same as the normal appropriate amount according to the dosage form, and is, for example, about 0.5 to 1.5 g.

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

Examples

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

[0042] (Raw materials used) <Component (A)> ·Silica a1-1: ZEODENT 103 (trade name), manufactured by EVONIK Corporation, average particle diameter = 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 Corporation, average particle diameter = 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 diameter = 150 μm, BET specific surface area = 400 m 2 / g, water absorption = 5.0 cm 3 / g.

[0043] <Component (B)> · Sodium polyacrylate b-1: Acpec-MG (trade name), manufactured by Sumitomo Seika Chemical Co., Ltd. · Sodium polyacrylate b-2: Rheodic-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 Rocket Co., Ltd., 70% sorbitol. · Humectant: Propylene glycol. · Active ingredient: Sodium fluoride. · Flavor: Other flavors (excluding Component (E)). · Water: Purified water.

[0048] (Method for measuring physical properties) <Plastic viscosity, yield stress> Using a viscoelasticity measuring device (MCR302 manufactured by Anton Paar), the measured values of "shear rate - shear stress" were applied to the analytical formula of the aggregation-dispersion system (the following Casson's equation), and the plastic viscosity and yield stress were obtained by calculation. The measurement was carried out using a cone plate with a diameter of 5 cm (CP50-1) in the shear rate range of 0.3 to 1.5. Casson's 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 monitors placed 1 g of the dentifrice composition on a toothbrush (Clinica Advantage Hubrush, 4-row compact regular type, manufactured by Lion Corporation) and brushed their oral cavities for 3 minutes. The dispersibility, brushing feel, foam persistence, and cool feeling of the dentifrice composition during brushing were evaluated according to the following evaluation criteria. The average of the evaluation scores of the ten people was calculated and judged according to the following judgment criteria.

[0050] <Dispersibility> ≪Evaluation Criteria≫ 4 points: The dispersibility in the oral cavity is very good (no lumps of paste remain). 3 points: The dispersibility in the oral cavity is good (slightly uneven paste parts remain). 2 points: The dispersibility in the oral cavity is poor (lumps of paste remain in the mouth). 1 point: The dispersibility in the oral cavity is very poor (large lumps of paste remain).

[0051] ≪Judgment Criteria≫ A: Average score of 3.5 points or more. B: Average score of 3.0 points or more and less than 3.5 points. C: Average score of 2.0 points or more and less than 3.0 points. D: Average score of less than 2.0 points.

[0052] <Brushing Feel> ≪Evaluation Criteria≫ 4 points: A strong brushing feel is felt. 3 points: A brushing feel is felt. 2 points: A slight brushing feel is felt (weak). 1 point: No brushing feel is felt.

[0053] ≪Judgment Criteria≫ A: Average score of 3.5 points or more. B: Average score of 3.0 points or more and less than 3.5 points. C: Average score of 2.0 points or more and less than 3.0 points. D: Average score of less than 2.0 points.

[0054] <Cool Feeling> ≪Evaluation Criteria≫ 4 points: A strong cool feeling is felt. 3 points: Feel a cool sensation. 2 points: Slightly feel a cool sensation. 1 point: Do not feel a cool sensation.

[0055] ≪Judgment Criteria≫ A: Average score is 3.5 points or more. B: Average score is 3.0 points or more and less than 3.5 points. C: Average score is 2.0 points or more and less than 3.0 points. D: Average score is less than 2.0 points.

[0056] <Bubble Persistence> ≪Evaluation Criteria≫ 4 points: The bubbles remained sufficiently. 3 points: The bubbles remained slightly. 2 points: Almost no bubbles remained. 1 point: No bubbles remained.

[0057] ≪Judgment Criteria≫ A: Average score is 3.5 points or more. B: Average score is 3.0 points or more and less than 3.5 points. C: Average score is 2.0 points or more and less than 3.0 points. D: Average score is less than 2.0 points.

[0058] (Examples 1 to 11, Comparative Examples 1 to 3) Toothpaste compositions (gel toothpastes) with the compositions shown in Tables 1 to 2 were prepared by a conventional method. 50 g of the obtained toothpaste composition was filled into a laminated tube, and the dispersibility, brushing feeling, bubble persistence, and cool feeling were evaluated by the above evaluation method, and the results are shown in the table. Note that the compounding amounts in the table are values in terms of pure components. Components not described in the table are not compounded. In the table, the compounding amount of purified water "balance" is the amount required for the total mass of the toothpaste composition to be 100% by mass.

[0059]

Table 1

[0060]

Table 2

[0061] As shown in Table 1, in Examples 1 to 11, the evaluations of dispersibility, brushing feeling, foam persistence, and cool feeling were "A" or "B". In Comparative Examples 1 and 2 where the B / C ratio was 0.3, the evaluation of dispersibility was "D". In Comparative Example 3 where the B / C ratio was 9.0, the evaluation of foam persistence was "D". From the above results, it was confirmed that by applying the present invention, improvements in dispersibility, brushing feeling, and foam persistence can be achieved.

Claims

Claim 1 comprising component (A): a group of silica particles, component (B): an acrylic polymer, component (C): a thickener (excluding component (B)), and component (D): a surfactant; a dentifrice composition wherein the mass ratio (B / C ratio) of the content of component (B) to the content of component (C) is 1.5 to 7. Claim 2 The BET specific surface area of the component (A) is 20 to 100 m ２ / g. The dentifrice composition according to claim 1. Claim 3 The dentifrice composition according to claim 1 or 2, further comprising component (E): a cooling agent. Claim 4 The dentifrice composition according to claim 1 or 2, having a plastic viscosity of 0 to 50 Pa·s. Claim 5 The dentifrice composition according to claim 1 or 2, having a yield stress of 20 to 500 Pa.

Images