CN113710328A

CN113710328A - Dentifrice composition

Info

Publication number: CN113710328A
Application number: CN202080027342.6A
Authority: CN
Inventors: 高下典浩
Original assignee: Lion Corp
Current assignee: Lion Corp
Priority date: 2019-04-05
Filing date: 2020-03-23
Publication date: 2021-11-26
Anticipated expiration: 2040-03-23
Also published as: CN113710328B; JPWO2020203409A1; WO2020203409A1; SG11202110369YA

Abstract

Provided is a dentifrice composition containing a sodium bicarbonate salt, which gives a high refreshing feeling, and has excellent foaming properties such that the dentifrice composition appropriately foams during tooth brushing and gives a foam having stiffness. The dentifrice composition contains (A) sodium bicarbonate, (B) an anionic surfactant, (C) carrageenan and (D) a water-soluble zinc salt, wherein the content of the component (A) is 0.1-2% by mass. The dentifrice composition further contains 20 to 70% by mass of (E) a polishing agent.

Description

Dentifrice composition

Technical Field

The present invention relates to a dentifrice composition containing sodium bicarbonate, giving a high refreshing feeling, and being excellent in foaming and foaming properties during tooth brushing.

Background

As a feeling of use of a dentifrice composition such as toothpaste, it is important to impart an effect of cleaning and refreshing the oral cavity after brushing teeth, and on the other hand, a feeling of use in which foaming and foaming properties are poor during brushing teeth is easily recognized as uncomfortable, leading to a reduction in the effect of feeling of use and in some cases a reduction in the effect of use.

In a dentifrice composition, a polishing agent is usually blended as a cleaning agent, a surfactant such as an anionic surfactant is blended for ensuring foaming, and sodium bicarbonate (baking soda) is added for giving a refreshing feeling. However, if sodium bicarbonate is added to a dentifrice composition in order to improve the refreshing feeling, the basic performance such as foaming performance may be impaired, and the use feeling may be reduced due to its salty taste.

Patent document 1 (japanese patent No. 5033283) proposes to improve the feeling of use due to a specific bitter component contained in an oral composition by adding baking soda in a specific amount more than the specific amount, but does not pay attention to the foaming performance and does not mention it. Patent document 2 (jp 2018 a-203640) proposes that by using an anionic surfactant and xanthan gum in combination in a dentifrice composition at 1.4% by mass or more, the outflow of foam from the mouth during tooth brushing can be prevented, and by adding a bicarbonate salt, the reduction in the refreshing feeling in the combined system can be eliminated.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5033283

Patent document 2: japanese patent laid-open publication No. 2018-203640

Patent document 3: japanese Kohyo publication No. 2017-514881

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dentifrice composition containing sodium bicarbonate, which gives a high refreshing feeling and has excellent foaming performance of giving a foam having stiffness by appropriately foaming at the time of tooth brushing.

Means for solving the problems

The present inventors have conducted intensive studies in order to achieve the above object and as a result, have found that when (C) carrageenan and (D) a water-soluble zinc salt are blended in combination with a dentifrice composition containing (a) a specific amount of sodium bicarbonate (baking soda) and (B) an anionic surfactant, moderate foaming is achieved, a decrease in the hardness of foam during tooth brushing due to the component (a) is prevented, and a stiff foam is prevented from being given, and the refreshing feeling in the oral cavity can be improved. That is, in the present invention, it has been found that a dentifrice composition containing (a) sodium bicarbonate, (B) an anionic surfactant, (C) carrageenan and (D) a water-soluble zinc salt, and having a content of the component (a) of 0.1 to 2% by mass gives a high refreshing feeling, has excellent foaming performance of giving a foam having stiffness by appropriately foaming at the time of tooth brushing, and can give a good use feeling with suppressed salty taste, and the present invention has been completed.

When the component (a) is blended in a dentifrice composition in order to impart a refreshing feeling and the component (B) is blended in order to ensure foaming, the hardness of the foam during brushing becomes weak as the blending amount of the component (a) increases, the foam is brittle and easily broken during brushing, a fluffy feeling is developed, the foam performance is lowered, and an unpleasant salty taste may be felt.

On the other hand, in the present invention, if the components (C) and (D) are blended in combination in a dentifrice composition containing a specific amount of the component (a) and the component (B), the combination of the four components specifically functions as a foam stiffness improver, so that a large amount of foam is rapidly formed without decreasing the stiffness of the foam during brushing, and a resilient and stiff foam is given with little possibility of being destroyed, whereby foaming and foaming properties are ensured and a high refreshing feeling is given, and a salty taste originating from the component (a) is suppressed to give a pleasant feeling of use.

The effect of the present invention is a particular effect obtained by combining the components (A), (B), (C) and (D), and particularly, when the component (C) or (D) is absent, the effect of improving the stiffness of the foam is poor. In this case, if the component (B) is absent, the foam is weak in stiffness even if a relatively large amount of other surfactants is added, and if the component (C) or (D) is absent, the foam is weak in stiffness even if xanthan gum, sodium carboxymethylcellulose or the like is blended as a binder, and the effect of the present action is poor.

As shown in comparative examples described later, when the components (A) and (B) are blended and the component (C) or (D) is not blended, the stiffness of the foam during brushing is poor (comparative examples 5 to 7). In comparative examples 5 and 6 lacking component (C), even when xanthan gum, sodium carboxymethylcellulose, and anhydrous silicic acid (thickening property) known as a binder in the same manner as component (C) are blended together with component (D), the stiffness of the foam during tooth brushing is poor. If component (B) is not blended, the foam stiffness during brushing is poor even if components (A), (C) and (D) are blended and further coconut oil fatty acid amide propyl betaine and polyoxyethylene hydrogenated castor oil are blended as a surfactant (comparative examples 3 and 4). In addition, even if the components (A), (B), (C) and (D) were blended, the hardness of the foam during brushing was poor in comparative example 2, in which the amount of component (A) was too large. On the other hand, the dentifrice composition of the present invention containing the components (a), (B), (C) and (D) in the specific ranges of the component (a) shown in the examples described later has a high refreshing feeling after rinsing, is excellent in the stiffness and foaming (degree of the amount of foam) of the foam during tooth brushing, is suppressed in salty taste, and has a good taste.

In the present invention, a calcium-based polishing agent and/or a silica-based polishing agent may be further blended as the polishing agent (E) in addition to the components (a), (B), (C) and (D).

It is presumed that the component (a) plays a certain role in the formation of the foam from the component (B) in the dentifrice composition because the component (a) weakens the stiffness of the foam. In addition, when a calcium-based abrasive is usually contained, foaming performance of the dentifrice composition such as foaming tends to be lowered. However, even when a calcium-based abrasive is added as the abrasive (E), the dentifrice composition of the present invention is excellent in foaming and foam stiffness during tooth brushing because the components (C) and (D) are added.

In patent document 1, the toothpaste of example 6 described as an oral composition in which the unpleasant sensation due to the specific bitter component was improved contains 30.0 mass% baking soda, zinc chloride, sodium lauryl sulfate, carrageenan, and a silica-based abrasive (anhydrous silicic acid), but the foaming performance was affected by an excessive amount of baking soda. Patent document 2 improves the outflow and refreshing feeling of a dentifrice composition by a combination of an anionic surfactant, xanthan gum and sodium bicarbonate. Further, patent document 3 (japanese patent publication No. 2017-514881) discloses an oral care composition containing a specific thickener system comprising a zinc ion source such as zinc citrate and carrageenan and having improved phase stability, but does not mention the incorporation of sodium bicarbonate into a dentifrice composition. On the other hand, the present invention is an extremely significant effect of improving the refreshing feeling of the dentifrice composition and improving the stiffness of the foam by combining the components (a), (B), (C) and (D), and this effect cannot be achieved in the absence of any component.

Accordingly, the present invention provides the dentifrice compositions described below.

〔1〕

A dentifrice composition comprising:

(A) sodium bicarbonate;

(B) an anionic surfactant;

(C) carrageenan; and

(D) a water-soluble zinc salt, a zinc salt,

(A) the content of the component is 0.1-2 mass%.

〔2〕

The dentifrice composition according to [ 1 ], wherein the water-soluble zinc salt (D) is at least 1 selected from zinc gluconate, zinc chloride and zinc citrate.

〔3〕

The dentifrice composition according to [ 1 ] or [ 2 ], wherein the content of the component (B) is 1 to 3% by mass.

〔4〕

The dentifrice composition according to any one of [ 1 ] to [ 3 ], wherein the content of the component (C) is 0.1 to 1% by mass.

〔5〕

The dentifrice composition according to any one of [ 1 ] to [ 4 ], wherein the content of the component (D) is 0.01 to 0.5% by mass based on the amount of zinc ions.

〔6〕

The dentifrice composition according to any one of [ 1 ] to [ 5 ], wherein the mass ratio of (B)/(D), which represents the ratio of the content of the component (B) to the content of the component (D) in terms of zinc ions, is 3 to 100.

〔7〕

The dentifrice composition according to any one of [ 1 ] to [ 6 ], which further comprises 20 to 70% by mass of an abrasive (E).

〔8〕

The dentifrice composition according to [ 7 ], wherein the (E) abrasive contains at least a calcium-based abrasive.

〔9〕

The dentifrice composition according to any one of [ 1 ] to [ 8 ], which is a toothpaste composition.

Effects of the invention

According to the present invention, a dentifrice composition containing a sodium bicarbonate salt can be provided which gives a high refreshing feeling and has excellent foaming properties such that the dentifrice composition appropriately foams during tooth brushing and gives a foam having stiffness.

Detailed Description

The present invention will be described in further detail below. The dentifrice composition of the present invention contains (A) sodium bicarbonate, (B) an anionic surfactant, (C) carrageenan and (D) a water-soluble zinc salt.

(A) Sodium bicarbonate acts to impart a refreshing feel to the dentifrice composition of the present invention.

Sodium hydrogen carbonate (baking soda) may be used, for example, under the trade name of Asahi glass company; sodium bicarbonate, and the like.

(A) The amount of sodium bicarbonate is 0.1 to 2% by mass (hereinafter, the same applies) of the total composition, preferably 0.3 to 1%. If the amount is less than 0.1%, a refreshing feeling cannot be sufficiently imparted. If too much is blended, not only the stiffness of the foam is poor but also the taste is reduced due to its own salty taste, and if it exceeds 2%, the stiffness of the foam is weak and the taste is also poor.

(B) The anionic surfactant has an effect of ensuring foaming.

The anionic surfactant is preferably an anionic surfactant having a hydrocarbon group such as an alkyl group, an acyl group, or an alkenyl group having 10 to 18 carbon atoms, preferably 10 to 16 carbon atoms, and examples thereof include alkyl sulfate, acylamino acid salt (e.g., acyl sarcosinate and acyl glutamate), α -alkenylsulfonate, acyl taurate, alkylbenzenesulfonate, and alkyl sulfoacetate. Specific examples thereof include alkyl sulfates such as sodium lauryl sulfate and sodium myristyl sulfate, acyl sarcosinates such as sodium N-lauroyl sarcosinate and sodium N-myristoyl sarcosinate, acyl glutamates such as palmitoyl glutamate and lauroyl glutamate, α -olefin sulfonates such as sodium tetradecene sulfonate, acyl taurates such as sodium lauroyl methyltaurate and sodium cocoyl methyltaurate, sodium dodecylbenzenesulfonate, sodium hydrogenated coconut fatty acid monoglyceride monosulfate, and sodium lauryl sulfoacetate. Among them, alkyl sulfate, acyl sarcosinate, and α -olefin sulfonate are preferable from the viewpoint of the foaming property and the stiffness of the foam. These can be used alone in 1 or a combination of 2 or more.

The anionic surfactant may be a commercially available surfactant. Specifically, sodium lauryl sulfate may be available under the trade name of Huawang Indonesia chemical company; EMAL10G-3, and trade names of sodium lauroyl sarcosinate available from Kawaken Fine Chemicals; soipon SLP and the like, sodium alpha-olefin sulfonate may be a sodium alpha-olefin sulfonate available under the trade name of Lion Specialty Chemicals; k Lipolan PJ-400CJ (sodium alpha-olefin sulfonate having 14 carbon atoms (common name; sodium tetradecene sulfonate)), and the like.

(B) The amount of the anionic surfactant is preferably 1 to 3%, more preferably 1.5 to 2.7%, and particularly preferably 1.5 to 2.5% of the total composition. When the amount is 1% or more, sufficient foaming can be obtained. If the content is 3% or less, the stimulation itself can be sufficiently suppressed and a good feeling of use can be maintained.

In the present invention, by using (C) carrageenan and (D) a water-soluble zinc salt in combination, these combined systems act as a stiffness improver for foams. If the component (C) or the component (D) is absent, the effect of improving the stiffness of the foam is low and the stiffness of the foam is poor. In the absence of component (D), the refreshing feeling is also reduced, and the taste is also reduced due to the salty taste produced by component (C).

(C) For example, carrageenan may be used under the trade name of CP Kelco (CP ケルコ); and GENUVISCO carrageenann type TPC-1.

(C) The amount of carrageenan blended is preferably 0.1 to 1%, more preferably 0.2 to 0.8%, and still more preferably 0.2 to 0.5% of the total composition. If the amount is 0.1% or more, the stiffness of the foam is sufficiently improved. If the content is 1% or less, the dispersibility of the preparation can be sufficiently ensured.

(D) The zinc ion of the water soluble zinc salt contributes to the stiffness improving effect of the foam. Further, the effect of imparting a refreshing feeling by the component (a) is enhanced, and the salty taste by the component (a) is suppressed.

Examples of the water-soluble zinc salt include zinc gluconate, zinc chloride, zinc citrate, zinc acetate, zinc lactate, zinc sulfate, and zinc nitrate, and hydrates thereof can also be used. In particular, zinc gluconate, zinc chloride and zinc citrate are preferable because of their high effect of improving the stiffness of the foam and little influence on the flavor. These can be used alone in 1 or a combination of 2 or more.

The water-soluble zinc salt may be a commercially available one. Specifically, zinc gluconate may be available under the trade name of Corbion; examples of the zinc chloride include zinc chloride, and zinc chloride available under the trade name of pure chemical; zinc chloride, and zinc citrate available under the trade name Fuji film and Wako pure chemical industries; zinc citrate dihydrate, and the like.

(D) The amount of the water-soluble zinc salt is preferably 0.01 to 0.5%, more preferably 0.05 to 0.2%, based on the amount of zinc ions, of the entire composition. When the blending amount (zinc ion amount) is 0.01% or more, the stiffness of the foam is sufficiently improved and a refreshing feeling can be sufficiently obtained, and the salty taste of the component (A) is sufficiently suppressed and the taste is also good. If the amount of the additive is too large, foaming may be affected and its metallic taste may be strongly developed, but if the amount is 0.5% or less, adequate foaming is sufficiently ensured and a good taste is maintained.

The mass ratio of (B)/(D), which represents the ratio of the amount of component (B) to the amount of component (D) added in terms of zinc ions, is preferably 3 to 100, more preferably 5 to 50, and particularly preferably 8 to 45. When the mass ratio of (B)/(D) is within the above range, the stiffness of the foam is further improved and adequate foaming can be sufficiently ensured. If the mass ratio of (B)/(D) is less than 3, foaming may be reduced, and if it exceeds 100, the stiffness of the foam may not be sufficiently obtained.

In the present invention, (E) an abrasive may be further blended.

(E) The polishing agent is not particularly limited as long as it is a usual polishing agent for a dentifrice composition, and a calcium-based polishing agent and/or a silica-based polishing agent are preferably used.

The calcium-based abrasive is an abrasive containing calcium in a compound, and examples thereof include calcium carbonate and dicalcium phosphate (CaHPO)₄) 2 hydrate or non-hydrate, monocalcium phosphate (Ca (H)₂PO₄)₂) Tricalcium phosphate (Ca)₃(PO₄)₂) Tetracalcium phosphate (Ca)₄(PO₄)₂O), calcium pyrophosphate, etc. Among them, calcium carbonate is preferable.

The silica-based polishing agent is a polishing agent containing silica in a compound, and may be a metal composite silica containing a metal such as aluminum or zirconium, and examples thereof include precipitated silica (anhydrous silicic acid), aluminum silicate, and zirconium silicate.

These can be used alone in 1 or a combination of 2 or more. Further, commercially available products can be used.

(E) The polishing agent preferably contains at least a calcium-based polishing agent, and particularly from the viewpoint of cleanability, the polishing agent is preferably a calcium-based polishing agent as a main polishing agent and further a silica-based polishing agent is used in combination.

In the dentifrice composition in which the components (a) and (B) are blended, the component (a) tends to affect the foam formed from the component (B) and to lower the stiffness of the foam, and the stiffness of the foam tends to be lower in the same manner as in the case where a large amount of calcium ions are eluted. However, in the present invention, even if a calcium-based abrasive is added as the abrasive (E) and a main abrasive is added, the hardness of the foam is sufficiently excellent by adding the components (C) and (D), and the salty taste is sufficiently suppressed and the taste is good. Thus, particularly in a system in which calcium ions are present, the effect of improving the stiffness of the foam by the components (C) and (D) is remarkable, and this is preferable.

(E) The total amount of the abrasive is preferably 20 to 70% of the total composition.

When the calcium-based abrasive is blended, the blending amount thereof may be 20 to 70%, preferably 25 to 50%, and more preferably 30 to 45% of the total composition.

The amount of the silica-based abrasive is preferably 0 to 20%, more preferably 0 to 5%, of the total composition.

When the main polishing agent is a calcium-based polishing agent and other polishing agents are added, for example, a silica-based polishing agent, the total amount of the components is preferably within the range of the total amount of the polishing agents added.

The dentifrice composition of the present invention can be prepared into toothpaste, liquid dentifrice and the like, and particularly preferably a toothpaste composition. The preparation method can adopt the conventional method. In this case, other suitable known components may be added in addition to the above components depending on the purpose of the composition, the dosage form, and the like. For example, a toothpaste may contain a surfactant, a binder, a humectant, and, if necessary, a sweetener, a preservative, a coloring agent, a flavor, an active ingredient, and the like. The amount to be blended may be a usual amount within a range not to impair the effects of the present invention.

As the optional surfactant, a nonionic surfactant or an amphoteric surfactant can be used.

Examples of the nonionic surfactant include polyoxyethylene fatty acid esters such as polyoxyethylene hydrogenated castor oil, sugar fatty acid esters such as sucrose fatty acid esters, sugar alcohol fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene higher alcohol ethers, fatty acid alkanolamides, and polyoxyethylene polyoxypropylene glycol. Among them, polyoxyethylene fatty acid esters having a hydrocarbon group of 12 to 18 carbon atoms and an average number of addition mols of ethylene oxide of 3 to 40, polyoxyethylene higher alcohol ethers having a hydrocarbon group of 12 to 18 carbon atoms and an average number of addition mols of ethylene oxide of 3 to 30, and polyoxyethylene polyoxypropylene glycols having a molar ratio (EO/PO) of oxyethylene group (EO) to oxypropylene group (PO) of 1 to 6 are preferable, and polyoxyethylene hydrogenated castor oil having an average number of addition mols of ethylene oxide of 10 to 40 is particularly preferable from the viewpoint of a refreshing feeling.

Examples of the amphoteric surfactant include acetic acid betaine type such as alkyl betaine and fatty acid amide propyl betaine, betaine type such as alkyl imidazolinyl betaine, imidazoline type such as N-fatty acid acyl-N-carboxymethyl-N-hydroxyethyl ethylenediamine salt, and imidazole betaine type such as 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolium betaine.

The amount of the nonionic surfactant is preferably 0.05 to 1%, particularly preferably 0.1 to 0.5%, of the total composition. The lower the amount of the nonionic surfactant, the more sufficient a refreshing feeling can be obtained.

The amount of the amphoteric surfactant is preferably 0.1 to 2%, particularly preferably 0.1 to 1%, of the total composition.

The binder may contain an organic binder and/or an inorganic binder other than the carrageenan (C). Examples thereof include organic binders such as xanthan gum, sodium alginate, sodium carboxymethylcellulose, and sodium polyacrylate, and inorganic binders such as thickening silica and thickening alumino-silica. The amount of the organic binder is preferably 0 to 2%, particularly preferably 0.1 to 1.3%, and the amount of the inorganic binder is preferably 1 to 10%, particularly preferably 3 to 8%, of the total composition.

Examples of the humectant include polyhydric alcohols such as glycerin, polyethylene glycol and propylene glycol, and sugar alcohols such as sorbitol. The amount of the wetting agent is preferably 5 to 40%, particularly preferably 10 to 30% of the total composition.

Examples of the sweetener include sodium saccharin.

Examples of the preservative include parabens, benzoic acid or a salt thereof.

Examples of the colorant include blue No. 1, yellow No. 4, titanium dioxide, and the like.

The perfume may be combined with oleum Menthae Dementholatum, spearmint oil, oleum Foeniculi, oleum Eucalypti, wintergreen oil, oleum Cinnamomi, oleum Caryophylli, thyme oil, sage oil, lemon oil, orange oil, oleum Menthae Dementholatum, fructus Amomi rotundus oil, and coriander oil; orange oil, lime oil, lavender oil, rosemary oil and bay oil; chamomile oil; zanthoxylum oil; marjoram oil, bay leaf oil, lemongrass oil, oregano oil; pine needle oil, neroli oil; rose oil; natural flavors such as jasmine oil, grapefruit oil, lime oil, grapefruit oil, iris extract, peppermint absolute, rose absolute, and orange blossom, flavors obtained by processing these natural flavors (removing pre-cut fraction, removing post-cut fraction, fractionating, liquid-liquid extracting, essence, powder flavoring, etc.), menthol, carvone, anethole, cineole, methyl salicylate, and cinnamaldehyde; eugenol, 3-l-menthoxypropane-1, 2-diol, thymol, linalool acetate, limonene, menthone, menthyl acetate, N-substituted-p-menthane-3-formamide, pinene, octanal, citral, pulegone, carvacrol acetate, anisaldehyde, ethyl acetate, ethyl butyrate, allyl cyclohexanepropionate, methyl anthranilate, ethyl methylphenyl glycidate, vanillin, undecalactone, hexanal, butanol, isoamyl alcohol, hexenol, dimethyl sulfide, methyl cyclopentenolone, furfural, trimethylpyrazine, ethyl lactate, ethyl thioglycolate and other single-product flavors, as well as strawberry flavor, apple flavor, banana flavor, pineapple flavor, grape flavor, mango flavor, butter flavor, milk flavor, fruit mix flavor, etc, Known flavor materials used in dentifrice compositions such as blended flavors including tropical fruit flavors and the like.

The amount of the perfume is not particularly limited, but the perfume material is preferably used in an amount of 0.000001 to 1% in the composition, and the perfuming perfume using the perfume material is preferably used in an amount of 0.1 to 2% in the composition.

Examples of the active ingredient include fluorine-containing compounds such as sodium fluoride, sodium monofluorophosphate and tin fluoride, whitening ingredients such as sodium polyphosphate, antibacterial ingredients such as isopropyl methylphenol, cetylpyridinium chloride, benzalkonium chloride and benzethonium chloride, anti-inflammatory ingredients such as dipotassium glycyrrhizinate, glycyrrhetinic acid and epsilon-aminocaproic acid, allergy-suppressing ingredients such as potassium nitrate and aluminum lactate, halitosis-suppressing ingredients such as copper gluconate, and tissue repair ingredients such as allantoin. The effective component may be used in an effective amount within a range not to impair the effects of the present invention.

Further, if necessary, medium-chain fatty acid triglyceride (the amount of the triglyceride is usually 0.01 to 0.5% of the total composition) may be added as an oily component, and a pH adjusting agent may be added to adjust the pH to 6 to 10(25 ℃).

The water content in the composition is preferably 10 to 40%, particularly preferably 20 to 30%.

[ examples ] A method for producing a compound

The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In the following examples,% represents% by mass unless otherwise specified.

[ examples and comparative examples ]

Dentifrice compositions (toothpaste compositions) having the compositions shown in tables 1 to 4 were prepared by a conventional method, and evaluated by the following method. The results are shown in tables 1 to 4. In the table, (B)/(D) is a mass ratio of ((amount of component B)/((amount of component D) blended in terms of zinc ion).

In the following evaluation, the teeth brushing was performed by applying about 1g of the dentifrice composition to a toothbrush by each subject, brushing the teeth for 3 minutes, and then rinsing the oral cavity with water.

(1) Method for evaluating clean feeling after rinsing

The tooth brushing was performed by 10 subjects using the dentifrice composition, and the refreshing feeling in the oral cavity after rinsing was judged based on the following scoring criteria. The average value of the scores of 10 was calculated, and the refreshing feeling after rinsing was evaluated based on the following evaluation criteria from the calculated average value.

Scoring benchmark

And 4, dividing: very fresh and cool

And 3, dividing: refreshing

And 2, dividing: slightly refreshing

1 minute: not fresh and cool

Evaluation criteria

Very good: average value of 3.0 min or more

O: an average value of 2.5 minutes or more and less than 3.0 minutes

And (delta): an average value of 2.0 minutes or more and less than 2.5 minutes

X: average value of less than 2.0 min

(2) Method for evaluating stiffness of foam during tooth brushing

10 subjects brushed their teeth with the dentifrice composition, and the hardness of the foam during brushing was determined based on the following scale. The average of 10 scores was calculated, and the stiffness of the foam at the time of brushing was evaluated based on the calculated average based on the following evaluation criteria.

Here, the stiffness of the foam means a degree of improvement in the elastic force of the foam felt when dense and aggregated foam is present in the oral cavity.

Scoring benchmark

And 4, dividing: the foam is very stiff

And 3, dividing: the foam having stiffness

And 2, dividing: the foam has a slight stiffness

1 minute: the foam has no stiffness

Evaluation criteria

Very good: average value of 3.0 min or more

O: an average value of 2.5 minutes or more and less than 3.0 minutes

And (delta): an average value of 2.0 minutes or more and less than 2.5 minutes

X: average value of less than 2.0 min

(3) Evaluation method of foaming during tooth brushing

10 subjects brushed their teeth with the dentifrice composition, and foaming (amount of foam) during brushing was determined based on the following scale. The average of 10 scores was calculated, and from the calculated average, foaming during brushing was evaluated based on the following evaluation criteria.

Scoring benchmark

And 4, dividing: very good foaming

And 3, dividing: good foaming

And 2, dividing: slightly better bubbling

1 minute: poor foaming

Evaluation criteria

Very good: average value of 3.0 min or more

O: an average value of 2.5 minutes or more and less than 3.0 minutes

And (delta): an average value of 2.0 minutes or more and less than 2.5 minutes

X: average value of less than 2.0 min

(4) Evaluation method of salty taste during tooth brushing

Among 10 subjects, the teeth were brushed with the dentifrice composition, and the salty taste during the brushing was investigated by questionnaire and judged by giving a score (1 to 4 points) based on the following score criteria. The average values of 10 were calculated, and the salty taste during tooth brushing was evaluated based on the calculated average values based on the following evaluation criteria.

Scoring benchmark

And 4, dividing: no salty taste is felt

And 3, dividing: hardly any salty taste was perceived

And 2, dividing: a slight salty taste was felt

1 minute: feel quite salty

Evaluation criteria

Very good: average value of 3.0 min or more

O: an average value of 2.5 minutes or more and less than 3.0 minutes

And (delta): an average value of 2.0 minutes or more and less than 2.5 minutes

X: average value of less than 2.0 min

Details of the raw materials used are shown below.

(A) Sodium bicarbonate

Trade name of Asahi glass Co., Ltd; sodium bicarbonate

(B) Sodium lauryl sulfate

Trade name manufactured by Huawang Indonesia chemical company; EMAL10G-3

(B) Tetradecene sulfonic acid sodium salt

Trade name manufactured by Lion Specialty Chemicals; k Lipolan P

J-400CJ

(B) Sodium lauroyl sarcosinate

Trade name manufactured by Kawaken Fine Chemicals; soipon SLP

Coconut oil fatty acid amide propyl betaine (comparative component)

Trade name manufactured by Evonik corporation; TEGO BETAIN ZF

(C) Carrageenan

Trade name manufactured by CP Kelco (CP ケルコ); GENUVISCO carrageenann type TPC-1

(D) Zinc gluconate

Trade name manufactured by Corbion; GLUCONAL ZN-P

(D) Zinc chloride

Trade name of genuine chemical corporation; zinc chloride

(D) Zinc citrate 2 hydrate

Fuji film and Wako pure chemical industries, trade name; zinc citrate dihydrate

(E) Calcium carbonate

Trade name of SancoUjing powder; CARCI-F (カルシー F)

(E) Anhydrous silicic acid (abrasive)

Manufactured by PQ Corporation, trade name; sorbosil AC77

[ TABLE 1 ]

[ TABLE 2 ]

[ TABLE 3 ]

[ TABLE 4 ]

Claims

1. A dentifrice composition comprising:

(A) sodium bicarbonate;

(B) an anionic surfactant;

(C) carrageenan; and

(D) a water-soluble zinc salt, a zinc salt,

(A) the content of the component is 0.1 to 2 mass%.

2. A dentifrice composition according to claim 1 in which (D) the water-soluble zinc salt is 1 or more selected from zinc gluconate, zinc chloride and zinc citrate.

3. The dentifrice composition according to claim 1 or 2, wherein the content of the component (B) is 1 to 3% by mass.

4. A dentifrice composition as claimed in any one of claims 1 to 3, wherein the content of component (C) is 0.1 to 1% by mass.

5. A dentifrice composition as claimed in any one of claims 1 to 4 wherein the content of component (D) is 0.01 to 0.5% by mass based on the amount of zinc ion.

6. A dentifrice composition as claimed in any one of claims 1 to 5 in which the mass ratio of (B)/(D), which represents the ratio of the content of component (B) to the content of component (D) in terms of zinc ion, is 3 to 100.

7. A dentifrice composition as claimed in any one of claims 1 to 6 further comprising 20 to 70% by mass of (E) an abrasive.

8. The dentifrice composition of claim 7, wherein (E) abrasive comprises at least a calcium-based abrasive.

9. A dentifrice composition as claimed in any one of claims 1 to 8 which is a toothpaste composition.