Dentifrice composition

Abstract

Provided is a dentifrice composition containing an anionic surfactant, in which bubbling is appropriately suppressed, and which has low foaming properties and provides a good feeling of use.　The dentifrice composition contains: (A) one or two or more anionic surfactants selected from acyl taurine, acylamino acid, alkyl sulfuric acid, and a salt thereof; (B) one or two or more selected from fatty acid triglycerides and vegetable oils and animal oils which are liquids at 25 °C; and (C) a nonionic surfactant, wherein the content of the component (B) is 0.05-1.5 mass%, and (B) / (A) is 1-10 by mass ratio.

Description

[Technical Field]

[0001] The present invention relates to a dentifrice composition that has moderately suppressed foaming, has low foaming properties, and is pleasant to use. [Background technology]

[0002] Dentifrice compositions generally contain abrasives, surfactants, humectants, binders, etc., and by incorporating an anionic surfactant as the surfactant, they exhibit a cleansing effect, such as removing stains from the oral cavity, as well as a bactericidal effect, and can impart a refreshing feeling to the oral cavity after brushing. However, users of dentifrice compositions, such as elderly people who require nursing care, tend to rinse insufficiently after brushing their teeth due to a decline in oral function. Furthermore, when rinsing is difficult, they often simply wipe the inside of their mouths with wet tissues or the like, which can result in insufficient removal of foam from the mouth, leaving behind irritation or an unpleasant taste. However, anionic surfactants have high foaming properties even when used in small amounts, and therefore, in order to suppress foaming in dentifrice compositions containing anionic surfactants, it is necessary to add a relatively large amount of an ingredient with anti-foaming properties. Commonly used flavoring ingredients also have anti-foaming properties, but adding these ingredients can affect the feel of use of the dentifrice composition and limit the composition design. As a result, it has not been possible to suppress foaming to achieve low foaming properties while ensuring a good feel of use and imparting a refreshing feel to the oral cavity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-289917 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-89870 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-231972 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made in view of the above circumstances, and aims to provide a dentifrice composition containing an anionic surfactant that has moderately suppressed foaming, low foaming properties, and a pleasant feel when used. [Means for solving the problem]

[0005] As a result of intensive research conducted by the present inventors to achieve the above-mentioned object, they have found that when a dentifrice composition containing a specific anionic surfactant is blended with a specific amount of a fatty acid triglyceride or a specific vegetable oil or animal oil in a specific ratio relative to the anionic surfactant, and a nonionic surfactant is also blended in combination, foaming is moderately suppressed even in the presence of an anionic surfactant, resulting in low foaming properties, and even though foaming is hardly felt, a refreshing feeling in the oral cavity after brushing (hereinafter sometimes abbreviated as "refreshing feeling") can be imparted, and the appearance stability can also be ensured. That is, according to the present invention, it has been discovered that a dentifrice composition containing (A) one or more anionic surfactants selected from acyltaurine, acylamino acid, alkyl sulfate, and salts thereof, (B) one or more oils selected from fatty acid triglycerides, vegetable oils, and animal oils that are liquid at 25°C, and (C) a nonionic surfactant, wherein the content of component (B) is 0.05 to 1.5% by mass and the mass ratio of (B) / (A) is 1 to 10, exhibits moderately suppressed foaming, is low-foaming, has a good feel when used, and has stable appearance, leading to the present invention.

[0006] In the present invention, when component (A) is used in combination with component (B) in a specific amount with a (B) / (A) mass ratio within a specific range, and when component (C) is also added, component (A) and component (B) interact stably and specifically, thereby imparting the above-mentioned exceptional action and effect. In this case, in the present invention, the combination of components (A), (B), and (C) maintains the cleaning effect and other functional effects of component (A), while suppressing foaming properties and foam persistence, resulting in less foaming, and component (B) is stably incorporated over time.As a result, even with a low foaming property that produces little foam, a refreshing feeling is imparted to the oral cavity after use, and the appearance stability can be ensured. As shown in the comparative examples described below, Comparative Examples 1, 3, and 4, in which the dentifrice compositions contained component (A) but not component (B), exhibited poor foaming properties even though they contained liquid paraffin or shea butter along with component (C). Comparative Examples 5 and 6, in which components (A) and (B) were contained but not component (C), exhibited poor appearance stability even though they contained the amphoteric surfactant coconut oil fatty acid amidopropyl betaine. Comparative Examples 7 and 8, in which components (A), (B), and (C) were contained but the mass ratio of (B) / (A) was inappropriate, exhibited poor foaming properties or a refreshing feeling. Comparative Example 9, in which the amount of component (B) was too high, exhibited poor refreshing properties and poor appearance stability. In contrast, as shown in the examples, a dentifrice composition of the present invention containing the components (A), (B), and (C) and in which the amount of component (B) and the mass ratio of (B) / (A) are within a specific range exhibited excellent foaming resistance, a refreshing feeling, and good appearance stability. Dentifrice compositions containing anionic surfactants, sucrose fatty acid esters, and liquid oils and fats are disclosed in Patent Documents 1 to 3, but these do not suppress foaming. From Patent Documents 1 to 3, it is difficult to imagine that the present invention, in which component (A) is combined with a combination of components (B) and (C), can achieve low foaming and ensure stable feel and appearance.

[0007] Accordingly, the present invention provides the following dentifrice compositions. [1] (A) one or more anionic surfactants selected from acyltaurine, acylamino acid, alkyl sulfate, and salts thereof; (B) One or more selected from fatty acid triglycerides, vegetable oils and animal oils that are liquid at 25°C and (C) Nonionic surfactant wherein the content of component (B) is 0.05 to 1.5% by mass and the mass ratio of (B) / (A) is 1 to 10. [2] The dentifrice composition according to [1], wherein component (A) is selected from acylamino acids and salts thereof. [3] The dentifrice composition according to [1] or [2], wherein the fatty acid triglyceride is a fatty acid triglyceride in which the fatty acid has 6 to 20 carbon atoms and is liquid at 25°C, and the vegetable oil or animal oil that is liquid at 25°C is selected from soybean oil, safflower oil, olive oil, avocado oil, corn germ oil, cod liver oil, and shark oil. [4] The dentifrice composition according to any one of [1] to [3], wherein component (C) is a polyglycerol fatty acid ester having a fatty acid having 12 to 18 carbon atoms. [5] The dentifrice composition according to [4], wherein the polyglycerol fatty acid ester having a fatty acid carbon number of 12 to 18 is at least one selected from hexadecaglyceryl laurate and decaglyceryl laurate. [6] The dentifrice composition according to any one of [1] to [5], which contains 0.05 to 1.5 mass % of component (A) and 0.1 to 2 mass % of component (C). [7] The dentifrice composition according to any one of [1] to [6], wherein the mass ratio of (C) / (B) is 0.5 to 5. [Effects of the Invention]

[0008] The present invention provides a dentifrice composition containing an anionic surfactant that exhibits moderately suppressed foaming, low foaming properties, and a pleasant feel when used. This dentifrice composition can remove foam from the mouth by simply rinsing or wiping after brushing, and can provide a cleansing effect due to component (A), while also imparting a refreshing feeling to the mouth, making it effective for oral care for a wide range of users. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in further detail below. The dentifrice composition of the present invention contains (A) one or more anionic surfactants selected from acyltaurine salts, acylamino acid salts, and alkyl sulfates, (B) one or more fatty acid triglycerides, and vegetable and animal oils that are liquid at 25°C, and (C) a nonionic surfactant.

[0010] Component (A) is one or more anionic surfactants selected from acyltaurine, acylamino acid, alkyl sulfate, and salts thereof. The acyltaurine, acylamino acid, or salts thereof preferably have an acyl group having 8 to 18 carbon atoms, and the alkyl sulfate or salts thereof preferably have an alkyl group having 8 to 12 carbon atoms. These salts are preferably alkali metal salts such as sodium salts. Examples of component (A) include acylamino acid salts such as sodium lauroyl sarcosinate and sodium cocoyl sarcosinate, acyltaurine salts such as sodium cocoyl methyl taurate and sodium lauroyl methyl taurate, and alkyl sulfates such as sodium lauryl sulfate and ammonium lauryl sulfate. In particular, acylamino acid salts are preferred from the standpoints of foaming inhibition and refreshing feeling, and sodium lauroyl sarcosinate is more preferred.

[0011] The blend amount of component (A) is preferably 0.05 to 1.5% (% by mass, hereinafter the same) of the total composition, more preferably 0.1 to 1%, and even more preferably 0.1 to 0.3%. The higher the blend amount, the more refreshing the feeling obtained, and when the blend amount is 1.5% or less, foaming is sufficiently suppressed and excellent low-foaming properties are obtained.

[0012] In addition to component (A), the dentifrice composition of the present invention may contain other anionic surfactants, such as alkyl phosphates and polyoxyethylene monoalkyl phosphates, within the scope that does not impair the effects of the present invention; however, these optional anionic surfactants do not necessarily have to be included.

[0013] Component (B) is one or more selected from fatty acid triglycerides, vegetable oils, and animal oils that are liquid at 25° C. These act as defoaming agents to maintain the cleaning effect and other functional effects of component (A) and to moderately suppress foaming, thereby achieving low-foam properties. As component (B), any of fatty acid triglycerides, vegetable oils that are liquid at 25° C., and animal oils that are liquid at 25° C. may be used, and from the viewpoint of the effectiveness, two or three of these may also be used in combination. Of these, fatty acid triglycerides are preferred from the viewpoint of low foaming.

[0014] The fatty acid triglyceride is preferably a fatty acid triglyceride that is liquid at 25° C. and has a fatty acid carbon number of 6 to 20, particularly 8 to 10. For example, a medium-chain fatty acid triglyceride (a mixture of fatty acids with 8 and 10 carbon atoms) can be mentioned.

[0015] Examples of vegetable oils and animal oils that are liquid at 25°C include vegetable oils such as soybean oil, safflower oil, olive oil, avocado oil, and corn germ oil, and animal oils such as cod liver oil and shark oil, with vegetable oils being particularly preferred in terms of their lack of foaming. The component (B) may be one type alone or a combination of two or more types, and commercially available products can be used.

[0016] The blending amount of component (B) is 0.05 to 1.5% of the total composition, preferably 0.1 to 1%, and more preferably 0.1 to 0.5%. If the blending amount is less than 0.05%, the lack of foaming will be poor, and if it exceeds 1.5%, the refreshing feeling will decrease and liquid separation will occur after storage, resulting in poor appearance stability.

[0017] The nonionic surfactant (C) acts as a solubilizer to stably blend the component (B) even after storage, and to provide a stable appearance. Examples of (C) nonionic surfactants include glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oils having an average number of added moles of ethylene oxide of 3 to 30 (particularly 5 to 20), polyoxyethylene alkyl ethers having an alkyl group with 12 to 18 carbon atoms and an average number of added moles of ethylene oxide of 2 to 40 (particularly 5 to 20), and polyoxyethylene sorbitan fatty acid esters. Glycerin fatty acid esters having a fatty acid carbon number of 12 to 18 are preferred, and specific examples include glyceryl myristate and glyceryl oleate. Polyglycerin fatty acid esters having a fatty acid carbon number of 12 to 18 are preferred, and specific examples include hexadecaglyceryl laurate, decaglyceryl laurate, decaglyceryl oleate, decaglyceryl pentaoleate, and decaglyceryl distearate. Among these, polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, and polyoxyethylene alkyl ethers are preferred in terms of appearance stability and a refreshing feeling, and polyglycerin fatty acid esters are more preferred in terms of a particularly refreshing feeling, with hexadecaglyceryl laurate and decaglyceryl laurate being even more preferred. The nonionic surfactant may be used alone or in combination of two or more kinds, and commercially available products may be used.

[0018] The blending amount of component (C) is preferably 0.1 to 2% of the total composition, more preferably 0.2 to 1%, and even more preferably 0.2 to 0.7%. When the blending amount is 0.1% or more, component (B) is blended stably even after storage, and sufficient stability of appearance is obtained. When the blending amount is 2% or less, no foaming and a sufficient refreshing feeling are obtained. When the blending amount is more than 2%, foaming cannot be suppressed and a sufficient refreshing feeling may not be obtained.

[0019] The ratio (B) / (A) of the amounts of component (A) and component (B) is a mass ratio of 1 to 10, preferably 2 to 7, and more preferably 3 to 5. If the mass ratio (B) / (A) is less than 1, foaming cannot be suppressed and the foaming ability is poor, whereas if it exceeds 10, the feel is oily and a refreshing feeling cannot be obtained.

[0020] Furthermore, the ratio (C) / (B) of the amounts of the (B) component and the (C) component is preferably 0.5 to 5 by mass, more preferably 1 to 3. Within the above range, the lack of foaming is even better, the refreshing feeling is even better, and the appearance stability is even better. If the mass ratio (C) / (B) is less than 0.5, the appearance stability may decrease, and if it exceeds 5, it may become difficult to suppress foaming.

[0021] The dentifrice composition of the present invention can be formulated into various dosage forms, such as toothpaste, liquid dentifrice, liquid dentifrice, and lubricant dentifrice, but is particularly suitable as a toothpaste. In this case, appropriate known ingredients can be blended in addition to the above-mentioned ingredients depending on the purpose and dosage form of the composition. For example, abrasives, humectants, binders, surfactants, and, if necessary, preservatives, sweeteners, colorants, flavorings, pH adjusters, active ingredients, etc. can be blended, and the dentifrice composition can be produced by mixing these ingredients with water. These optional ingredients can be blended in normal amounts as needed. In the following, the blend amount refers to the amount relative to the entire composition.

[0022] Examples of abrasives include silica-based abrasives such as anhydrous silicic acid, precipitated silica, aluminosilicate, and zirconosilicate, calcium phosphate-based compounds such as dibasic calcium phosphate dihydrate or anhydrous calcium phosphate, calcium carbonate, and synthetic resin-based abrasives. The amount of abrasive to be used should be 0-50%, and if used, 5-15% is recommended. The dentifrice composition of the present invention does not need to contain an abrasive, and the effects of the present invention can be obtained even when it is prepared as a non-abrasive toothpaste.

[0023] Examples of the humectant include sugar alcohols such as sorbitol and xylitol, and polyhydric alcohols such as glycerin and propylene glycol. The amount of humectant blended is usually 5 to 50%, particularly 10 to 30%.

[0024] The binder may be organic or inorganic. Specific examples include organic binders such as cellulose derivatives (e.g., sodium carboxymethylcellulose, methylcellulose, and hydroxymethylcellulose), alginic acid derivatives, gums (e.g., xanthan gum), and sodium polyacrylate, as well as inorganic binders (e.g., thickening silica and thickening aluminum silica). The binder content is typically 0.1 to 10%. In the present invention, organic binders are particularly preferred, and the blending amount of the organic binder is preferably 0.1 to 5%, and more preferably 0.5 to 3%.

[0025] Examples of optional surfactants include cationic surfactants such as alkylammonium types and alkylbenzylammonium salts, acetic acid betaine types such as alkyl betaine and fatty acid amidopropyl betaine, and imidazolinium betaine (alkylimidazole) type amphoteric surfactants such as alkylimidazolinium betaine and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine. The amount of any surfactant to be added is 0 to 10%, and when added, it is preferably 0.001 to 10%, particularly preferably 0.1 to 5%.

[0026] Examples of preservatives include parahydroxybenzoic acid esters such as methylparaben (methyl parahydroxybenzoate), benzoic acid, and salts thereof. Sweeteners include saccharin sodium and the like. Coloring agents include Blue No. 1, Yellow No. 4, titanium dioxide, and the like.

[0027] Fragrances include peppermint oil, spearmint oil, anise oil, eucalyptus oil, wintergreen oil, cassia oil, clove oil, thyme oil, sage oil, lemon oil, orange oil, mint oil, cardamom oil, coriander oil, mandarin oil, lime oil, lavender oil, rosemary oil, laurel oil, chamomile oil, caraway oil, marjoram oil, bay oil, lemongrass oil, origanum oil, pine needle oil, neroli oil, rose oil, jasmine oil, grapefruit oil, sweet jasmine oil, Natural fragrances such as yuzu oil, iris concrete, absolute peppermint, absolute rose, orange flower, and processed fragrances (front distillation, tail distillation, liquid-liquid extraction, essence, powder fragrance, etc.) of these natural fragrances, as well as menthol, carvone, anethole, cineole, methyl salicylate, cinnamic aldehyde, eugenol, 3-l-menthoxypropane-1,2-diol, thymol, linalool, linalyl acetate, limonene, The flavoring agent may be a single flavor such as menthone, menthyl acetate, N-substituted-paramenthan-3-carboxamide, pinene, octyl aldehyde, citral, pulegone, carbeyl acetate, anisaldehyde, ethyl acetate, ethyl butyrate, allyl cyclohexane propionate, methyl anthranilate, ethyl methylphenyl glycidate, vanillin, undecalactone, hexanal, butanol, isoamyl alcohol, hexenol, dimethyl sulfide, cyclotene, furfural, trimethylpyrazine, ethyl lactate, or ethyl thioacetate, or a compound flavor such as strawberry flavor, apple flavor, banana flavor, pineapple flavor, grape flavor, mango flavor, butter flavor, milk flavor, fruit mix flavor, or tropical fruit flavor. The flavoring agent may be a combination of known flavoring materials used in oral compositions, and is not limited to the flavors described in the examples. The amount of the fragrance to be added is not particularly limited, but the above fragrance materials are preferably used in an amount of 0.000001 to 1% in the composition, and fragrances using the above fragrance materials are preferably used in an amount of 0.1 to 2% in the composition.

[0028] A pH adjuster may be added, for example, citric acid or a salt thereof such as citric acid or sodium citrate.

[0029] Examples of active ingredients include fluorine-containing compounds such as sodium fluoride and sodium monofluorophosphate, nonionic bactericides such as isopropylmethylphenol, cationic bactericides such as cetylpyridinium chloride, anti-inflammatory agents such as tranexamic acid and allantoin, enzymes such as dextranase, water-soluble phosphate compounds, inorganic salts such as sodium chloride, potassium nitrate and aluminum lactate, vitamins such as ascorbic acid and tocopherol acetate, plant extracts, anti-tartar agents, and anti-plaque agents. The active ingredient can be blended in an effective amount within a range that does not interfere with the effects of the present invention. [Example]

[0030] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples. In the following examples, % indicates % by mass unless otherwise specified.

[0031] [Examples and Comparative Examples] Dentifrice compositions (toothpastes) having the compositions shown in Tables 1 to 3 were prepared by conventional methods, and these were used as samples and evaluated by the following methods. The results are also shown in the tables.

[0032] <Evaluation method for usability (lack of foaming, refreshing feeling)> Immediately after preparation, the samples were evaluated by a panel of five expert test subjects for their feel when used (lack of foaming, refreshing feeling). 1 g of the sample was placed on a toothbrush (Clinica Advantage Toothbrush, 4-row compact regular type, manufactured by Lion Corporation), and the teeth were brushed for 3 minutes, followed by rinsing with water. The foaming during use (while brushing teeth) and the refreshing feeling in the mouth after use (after rinsing) were evaluated using the following rating scale. The scores of the five panelists were averaged and the lack of foaming and refreshing feeling were evaluated based on the following rating scale.

[0033] Scoring criteria for lack of foam 5: Almost no foaming 4: Slight foaming 3: I feel some foaming 2: I can feel a lot of foaming 1: Very foamy Evaluation criteria for lack of foaming (○ or above is considered a pass) ☆: Average score of 5 people is 4.5 points or higher ◎: The average score of the five people is between 4 and 4.5 points ○: The average score of the 5 people is between 3 and 4 points ×: The average score of 5 people is less than 3 points

[0034] Refreshing taste rating criteria 5: I felt a very refreshing sensation 4: I felt a refreshing sensation 3: I felt a slight refreshing feeling 2: I didn't feel much refreshment. 1: I didn't feel any refreshing sensation at all Evaluation criteria for refreshing feeling (○ or above is considered a pass) ☆: Average score of 5 people is 4.5 points or higher ◎: The average score of the five people is between 4 and 4.5 points ○: The average score of the 5 people is between 3 and 4 points ×: The average score of 5 people is less than 3 points

[0035] <Evaluation method for appearance stability> Immediately after preparation, 90 g of the sample was filled into a standard aluminum laminated tube container and stored at 60°C for one month. After that, the sample was extruded from the container and the appearance of the formulation (absence of liquid separation) was visually inspected, and the appearance stability was evaluated according to the following evaluation criteria. Appearance stability evaluation criteria (○ or above is considered pass) ◎: No liquid separation at all ○: Slight liquid separation is observed at the opening of the tube, but it is not a problem. ×: Liquid separation is observed from the opening of the tube to the inside.

[0036] Details of the raw materials used are shown below. Component (A) Sodium Lauroyl Sarcosinate: Kawaken Fine Chemicals Co., Ltd., product name: Soybon SLP Sodium lauryl sulfate: BASF Japan Ltd., product name: Texapon OC-P Sodium Methyl Lauroyl Taurate: Nikko Chemicals Co., Ltd., product name: NIKKOL LMT (B) Component Fatty acid triglycerides: (Mixture of fatty acids with 8 and 10 carbon atoms, fatty acid carbon chain composition ratio and C8: 70%, C10: 30%) Fuji Oil Co., Ltd., product name: MCT-73 olive oil: Nikko Chemicals Co., Ltd., product name: NIKKOL Olive Oil Safflower oil: Nikko Chemicals Co., Ltd., product name: NIKKOL Safflower Oil (B') Liquid paraffin (comparison component): Sanko Chemical Industry Co., Ltd., product name: Liquid Paraffin 350-S (B') Shea butter (comparison ingredient): Made by Croda Japan, product name: CroPure Shea Butter (C) Component Decaglyceryl Laurate: Manufactured by Sakamoto Pharmaceutical Co., Ltd., product name: SY Glyster Polyoxyethylene (20) hydrogenated castor oil: Manufactured by Nippon Surfactant Industries Co., Ltd., product name: NIKKOL HC O-20 Polyoxyethylene (5) stearyl ether: Lion Chemical Company, product name: RHA-155 SCE (C') Coconut oil fatty acid amidopropyl betaine (30% aqueous solution) (comparison ingredient) ): Degussa, product name: TEGO BETAIN CK-OK In the table, the amounts of components (A) to (C), (B'), and (C') are shown in terms of pure content.

[0037] Table 1

[0038] Table 2

[0039] Table 3

Claims

1. (A) one or more anionic surfactants selected from sodium lauroyl sarcosinate, sodium lauryl sulfate, and sodium lauroyl methyl taurate; (B) one or more selected from fatty acid triglycerides having a fatty acid carbon number of 8 to 10, olive oil, safflower oil, olive oil and safflower oil; and (C) one or more nonionic surfactants selected from decaglyceryl laurate, polyoxyethylene (20) hydrogenated castor oil, and polyoxyethylene (5) stearyl ether wherein the content of component (B) is 0.05 to 1.5% by mass and the mass ratio of (B) / (A) is 2 to 8.

2. 2. The toothpaste composition according to claim 1, wherein component (A) is one or two anionic surfactants selected from the group consisting of sodium lauroyl sarcosinate and sodium lauroyl methyl taurate.

3. The toothpaste composition according to claim 1 or 2, wherein the mass ratio of (B) / (A) is 3 to 5.

4. The toothpaste composition according to any one of claims 1 to 3, comprising 0.05 to 1.5% by mass of component (A) and 0.1 to 2% by mass of component (C).

5. 5. The toothpaste composition according to claim 1, wherein the mass ratio of (C) / (B) is 0.5 to 5.

6. A toothpaste composition according to any one of claims 1 to 4, wherein the mass ratio of (C) / (B) is 1 to 3.

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