Liquid oral composition in a foam dispensing container

Abstract

To provide a liquid oral composition in a foam discharge container which has excellent defoaming properties while exhibiting good foaming properties, effectively reduces the feeling of residual foam, and can achieve the comfortable use feeling.SOLUTION: The liquid oral composition in a foam discharge container contains the following components (A) and (B): (A) a cationic fungicide; and (B) 0.05% by mass or more and 1% by mass or less of a nonionic polysaccharide having a viscosity of 2% by mass of aqueous solution at 25°C is 3 mPa s or more and less than 6000 mPa s and having a hydrophilic group. The mass ratio ((B) / (A)) of the content of the component (B) to the content of the component (A) is 1 or more and 22 or less, and the total content of an anionic surfactant (c1) and an amphoteric surfactant (c2) is less than 0.12% by mass, or neither the anionic surfactant (c1) nor the amphoteric surfactant (c2) is contained.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a liquid oral composition contained in a foam discharge container.

Background Art

[0002] Conventionally, an oral composition that is filled in a container capable of discharging the contents in a foamed state and is applied in a foamed state from a discharge port into the oral cavity during use is known. When applied in a foamed state, it is possible to feel that the composition spreads to every corner of the oral cavity, and it can also contribute to the adsorptivity of the active ingredient in the oral cavity.

[0003] For example, Patent Document 1 discloses a foamed oral composition obtained by filling a non-gas normal pressure container with an oral composition containing an anionic surfactant, a non-ionic surfactant, and an amphoteric surfactant such as an imidazolinium betaine type or an N-alkyl amino acid derivative, and attempts have been made to enhance the permeability while improving the shape retention and uniformity of the foam. Further, Patent Document 2 discloses a liquid oral composition contained in a foam discharge container that contains an anionic surfactant and an amphoteric surfactant and a specific polymer in specific amounts, and aims to improve the dischargeability and storage stability at low temperatures while ensuring good foam quality.

[0004] Furthermore, Patent Document 3 discloses a liquid oral composition for being prepared in a foamed state, which contains a non-ionic surfactant, an amphoteric surfactant, and a polyhydric alcohol and / or a lower alcohol, and substantially does not contain an anionic surfactant.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0006] Oral compositions applied to the oral cavity in a foamy form may leave a feeling of residual foam in the mouth even after being spat out (hereinafter also referred to as "residual foam sensation"). Excessive residual foam sensation can cause discomfort in the oral cavity and may impair the feeling of proper cleaning, so it is desirable to reduce it.

[0007] However, in the compositions described in Patent Documents 1 and 2, for example, if the content of anionic surfactants or amphoteric surfactants is reduced in order to suppress excessive residual foaming, the foaming properties themselves will be impaired during application. Furthermore, even in the composition described in Patent Document 3, the residual foaming properties have not yet been sufficiently reduced, and there is still room for improvement in order to fully achieve both excellent foaming properties and reduced residual foaming properties.

[0008] In other words, the present invention relates to a liquid oral composition in a foam dispensing container that exhibits good foaming properties while also having excellent foam dissipation properties, effectively reducing residual foam and providing a comfortable user experience. [Means for solving the problem]

[0009] Therefore, after various studies, the inventors have found that by using a cationic disinfectant along with a specific nonionic polysaccharide in a specific mass ratio, it is possible to obtain a liquid oral composition in a foam dispensing container that maintains excellent foaming properties while limiting the content of anionic and amphoteric surfactants, and also exhibits good foam dissipation properties, thereby effectively reducing residual foam.

[0010] Therefore, the present invention comprises the following components (A) and (B): (A) Cationic disinfectants (B) Nonionic polysaccharide having a viscosity of 3 mPa·s or more and less than 6000 mPa·s at 25°C in a 2% by mass aqueous solution, and having hydrophilic groups: 0.05% by mass or more and 1% by mass or less It contains such that the mass ratio of the content of component (B) to the content of component (A) ((B) / (A)) is 1 or more and 22 or less, and The present invention provides a liquid oral composition in a foam dispensing container in which the total content of anionic surfactant (c1) and amphoteric surfactant (c2) is less than 0.12% by mass, or which does not contain either anionic surfactant (c1) or amphoteric surfactant (c2). [Effects of the Invention]

[0011] The liquid oral composition in a foaming dispenser of the present invention exhibits excellent foaming properties while limiting the content of anionic and amphoteric surfactants, and also shows excellent foam dissipation when spit out of the mouth after application, effectively reducing the feeling of unwanted residual foam. Therefore, in the oral cavity, it is possible to experience a good cleaning sensation due to its excellent foaming properties during use, and after use, a clean and comfortable feeling can be experienced without feeling any residual foam. [Modes for carrying out the invention]

[0012] The present invention will be described in detail below. Furthermore, "residual foam sensation" refers to an unpleasant sensation that occurs when, after applying the liquid oral composition in the foam dispensing container of the present invention to the oral cavity and rinsing the mouth, the composition is spat out of the mouth, resulting in poor foam removal and the feeling that foam remains unnecessarily in the oral cavity.

[0013] The liquid oral composition in a foam dispensing container of the present invention contains a cationic disinfectant as component (A). By including component (A), a bactericidal effect is achieved, and together with component (B) described later, it contributes to the development of excellent foaming properties and good foam dissipation, effectively reducing residual foam.

[0014] Specifically, the cationic disinfectant of component (A) includes one or more selected from alkylpyridinium salts, benzyl long-chain alkyl short-chain dialkylammonium salts and their derivatives, and long-chain alkyl short-chain trialkylammonium salts. More specifically, it includes one or more selected from benzalkonium chloride, cetylpyridium chloride, benzethonium chloride, stearyldimethylbenzylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, and stearyltrimethylammonium chloride. In particular, from the viewpoint of contributing to the development of excellent foaming properties and good foam dissipation through components (A) and (B), and effectively reducing residual foam while providing excellent bactericidal action, one or more selected from cetylpyrinidium chloride, benzalkonium chloride, and benzethonium chloride are preferred, with cetylpyrinidium chloride being more preferred.

[0015] The content of component (A) in the liquid oral composition in a foam dispensing container of the present invention is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.03% by mass or more, preferably 0.3% by mass or less, more preferably 0.15% by mass or less, and even more preferably 0.08% by mass or less, in order to contribute to the development of excellent foaming properties and good foam dissipation properties, and to effectively reduce the feeling of residual foam after application to the oral cavity.

[0016] The liquid oral composition in a foam dispensing container of the present invention contains, as component (B), 0.05% by mass to 1% by mass of a nonionic polysaccharide having a viscosity of 3 mPa·s or more and less than 6000 mPa·s at 25°C as a 2% by mass aqueous solution and having hydrophilic groups. The nonionic polysaccharide of component (B) can provide excellent foaming properties even with low content of the anionic surfactant (c1) or amphoteric surfactant (c2) described later, or even without any anionic surfactant (c1) or amphoteric surfactant (c2) at all, while also contributing to the development of excellent foam dissipation after application to the oral cavity, and effectively reducing residual foam sensation.

[0017] The viscosity of a 2% by mass aqueous solution of component (B) nonionic polysaccharide at 25°C is 3 mPa·s or more, preferably 30 mPa·s or more, more preferably 80 mPa·s or more, less than 6000 mPa·s, preferably 4800 mPa·s or less, and more preferably 1000 mPa·s or less, from the viewpoint of effectively contributing to the development of excellent foaming and foam dissipation properties. Here, the viscosity of the nonionic polysaccharide component (B) refers to the value obtained by preparing a 2% by mass aqueous solution and measuring the liquid viscosity (mPa·s) at room temperature (25°C) after 1 minute from the start of measurement using a B-type viscometer (rotor No.: 1-4, rotation speed 30-60 rpm).

[0018] The nonionic polysaccharide of component (B) has hydrophilic groups. Examples of such hydrophilic groups include hydroxyl groups and ethylene oxide groups.

[0019] Specific examples of the nonionic polysaccharide of component (B) include one or more selected from pullulan, inulin, pectin, amylopectin, amylose, guar gum, mannan, glucomannan, cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, and methyl cellulose. Among these, one or more selected from pullulan, pectin, hydroxyethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose are preferred, one or more selected from pullulan, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose are more preferred, and hydroxyethyl cellulose is even more preferred.

[0020] In addition, as hydroxyethyl cellulose and hydroxypropyl methyl cellulose, those having a mass average molecular weight (Mw) of 50,000 to 1,100,000 are preferred, more preferably those having a mass average molecular weight of 80,000 to 600,000 are more preferred, and those having a mass average molecular weight of 110,000 to 400,000 are even more preferred. Here, the mass average molecular weight (Mw) means a value determined by the GPC method (gel filtration chromatography method).

[0021] From the viewpoint of effectively contributing to the expression of excellent foaming properties and foam breakability, the content of component (B) is 0.05% by mass or more, preferably 0.06% by mass or more, more preferably 0.07% by mass or more, and even more preferably 0.08% by mass or more in the liquid oral composition contained in the foam discharge container of the present invention. Also, from the viewpoint of maintaining appropriate viscosity and ensuring good dischargeability from the container, the content of component (B) is 1% by mass or less, preferably 0.8% by mass or less, more preferably 0.6% by mass or less, and even more preferably 0.5% by mass or less in the liquid oral composition contained in the foam discharge container of the present invention. And the content of component (B) is 0.05% by mass or more and 1% by mass or less, preferably 0.06 to 0.8% by mass, more preferably 0.07 to 0.6% by mass, and even more preferably 0.08 to 0.5% by mass in the liquid oral composition contained in the foam discharge container of the present invention.

[0022] The mass ratio ((B) / (A)) of the content of component (B) to the content of component (A) is 1 or more, preferably 3 or more, more preferably 4 or more, 22 or less, preferably 21 or less, and more preferably 18 or less from the viewpoint of providing excellent foaming properties, contributing to the expression of excellent foam breakability after application in the oral cavity, and effectively reducing the residual foam feeling.

[0023] In the liquid oral composition contained in the foam discharge container of the present invention, the total content of the anionic surfactant (c1) and the amphoteric surfactant (c2) is less than 0.12% by mass in the liquid oral composition contained in the foam discharge container of the present invention, or the liquid oral composition contained in the foam discharge container of the present invention does not contain either the anionic surfactant (c1) or the amphoteric surfactant (c2). In the liquid oral composition contained in the foam discharge container of the present invention, excellent foaming properties can be exhibited even when the content of the anionic surfactant (c1) or the amphoteric surfactant (c2) is low, or even when neither the anionic surfactant (c1) nor the amphoteric surfactant (c2) is contained at all. Therefore, the content of these anionic surfactants (c1) and amphoteric surfactants (c2) can be restricted, and the residual foam feeling after application in the oral cavity can be more effectively reduced.

[0024] Specific examples of the anionic surfactant of component (c1) include alkyl sulfate esters such as lauryl sulfate and myristyl sulfate; alkyl phosphates such as lauryl phosphate; α-olefin (C14 - C16) sulfonates having 14 to 16 carbon atoms in the olefin; N-acyl amino acid salts such as N-lauroyl glutamate, N-myristoyl glutamate, N-palmitoyl glutamate, and N-cocoyl glutamate; N-methyl acyl taurine salts such as N-lauroyl methyl taurine salt and N-myristoyl methyl taurine salt; N-acyl taurine salts such as N-lauroyl taurine salt and N-myristoyl taurine salt; acyl sarcosine salts such as N-lauroyl sarcosine salt and N-myristoyl sarcosine salt, and the like. If the product contains an anionic surfactant as component (c1), then among these components (c1), lauryl sulfate, N-acyl amino acid salts, etc., are preferred.

[0025] Examples of amphoteric surfactants in component (c2) include betaines such as lauryldimethylaminoacetic acid betaine; imidazolinium betaines such as 2-alkyl-N-carboxymethyl-N-hydroxyethyl-N-imidazolium betaine; alkyl sulfobetaines such as lauryl sulfobetaine and lauryl hydroxysulfobetaine; coconut oil fatty acid amide alkyl betaines such as coconut oil fatty acid amidopropyl betaine; and long-chain alkylimidazoline betaine salts such as N-alkyl-1-hydroxyethylimidazoline betaine sodium. If the product contains an amphoteric surfactant as component (c2), coconut oil fatty acid amide alkyl betaine is preferred among these components (c2).

[0026] From the viewpoint of more effectively reducing the residual foaming sensation after application to the oral cavity, the total content of component (c1) and component (c2) in the liquid oral composition in a foam dispensing container of the present invention is less than 0.12% by mass, preferably 0.11% by mass or less, more preferably 0.1% by mass or less, even more preferably 0.095% by mass or less, even more preferably 0.08% by mass or less, even more preferably 0.06% by mass or less, even more preferably 0.04% by mass or less, even more preferably 0.02% by mass or less, and even more preferably 0.005% by mass or less. Alternatively, the liquid oral composition in a foam dispensing container of the present invention may substantially not contain either the anionic surfactant of component (c1) or the amphoteric surfactant of component (c2). Furthermore, as described later, if the liquid oral composition in a foam dispensing container of the present invention further contains ethanol (E), it is preferable that it also contains the anionic surfactant of component (c1) mentioned above.

[0027] When the liquid oral composition in a foam dispensing container of the present invention contains an anionic surfactant as component (c1) or an amphoteric surfactant as component (c2), the mass ratio ((A) / {(c1)+(c2)}) of the content of component (A) to the total content of components (c1) and (c2) is preferably 0.1 or higher, more preferably 0.14 or higher, even more preferably 0.16 or higher, preferably 8 or lower, more preferably 6 or lower, and even more preferably 4 or lower, from the viewpoint of exhibiting excellent foaming properties while effectively reducing the feeling of residual foam after application to the oral cavity.

[0028] The liquid oral composition in a foam dispensing container of the present invention preferably further contains a nonionic surfactant (D). This promotes the solubilization of component (A) to effectively exert a bactericidal effect, while further ensuring the development of excellent foaming properties and good foam dissipation properties in the presence of component (B).

[0029] Component (D) is a nonionic surfactant that can be specifically selected from one or more of the following: polyoxyethylene hydrogenated castor oil, fatty acid sorbitan esters, fatty acid polyoxyethylene sorbitan esters, sucrose fatty acid esters, and alkyl glycosides. The average number of moles of ethyleneoxy groups added to polyoxyethylene hydrogenated castor oil is preferably 20 to 100 moles, and more preferably 40 to 80 moles. In particular, from the viewpoint of effectively promoting the solubilization of component (A), contributing to the development of excellent foaming properties and good dissipation properties, effectively reducing residual foam, and maintaining good discharge properties, polyoxyethylene hydrogenated castor oil and polyglycerin fatty acid esters are preferred, with polyoxyethylene hydrogenated castor oil being more preferred.

[0030] From the viewpoint of effectively promoting the solubilization of component (A), the content of component (D) in the liquid oral composition in a foam dispensing container of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more. Furthermore, from the viewpoint of maintaining good dispensability, the content of component (D) in the liquid oral composition in a foam dispensing container of the present invention is preferably 1.5% by mass or less, more preferably 1.2% by mass or less, and even more preferably 1% by mass or less. And, the content of component (D) in the liquid oral composition in a foam dispensing container of the present invention is preferably 0.1% by mass or more and 1.5% by mass or less, more preferably 0.2 to 1.2% by mass, and even more preferably 0.3 to 1% by mass.

[0031] The mass ratio ((D) / (A)) of the content of component (D) to the content of component (A) is preferably 1 or more, more preferably 3 or more, even more preferably 5 or more, preferably 85 or less, more preferably 83 or less, and even more preferably 81 or less, from the viewpoint of effectively promoting the solubilization of component (A), effectively reducing residual foam, and maintaining good discharge properties.

[0032] The liquid oral composition in a foam dispensing container of the present invention may further contain ethanol (E). This makes it possible to further improve foam dissipation and to more effectively reduce residual foam. However, when ethanol as component (E) is included, it is preferable to include an anionic surfactant as component (c1) from the viewpoint of ensuring good foaming, and it is preferable to include one or more (c1') selected from N-acyl amino acids and their salts as the anionic surfactant as component (c1) from the viewpoint of suppressing the expression or enhancement of bitterness derived from ethanol as component (E) or bitterness derived from component (A).

[0033] The one or more acyl groups selected from the N-acylamino acids and their salts of component (c1') are preferably derived from saturated or unsaturated linear or branched fatty acids, preferably acyl groups having 6 to 22 carbon atoms, more preferably acyl groups having 10 to 20 carbon atoms, and even more preferably acyl groups having 12 to 18 carbon atoms. The acyl group is preferably one or more selected from capryloyl, lauroyl, myristoyl, palmitoyl, stearoyl, and cocoyl groups, more preferably one or more selected from lauroyl, myristoyl, and cocoyl groups, and even more preferably one or two selected from lauroyl and myristoyl groups.

[0034] The amino acid portion constituting one or more selected from N-acyl amino acids and their salts of component (c1') may be glutamic acid, aspartic acid, or glycine, and may be the D-form, L-form, or a mixture of the D-form and L-form, with the L-form being preferred. Specifically, the N-acyl amino acid is preferably one or more selected from N-lauroyl glutamic acid, N-myristoyl glutamic acid, N-cocoyl glutamic acid, N-lauroyl aspartic acid, N-myristoyl aspartic acid, and N-cocoyl aspartic acid, N-lauroyl glycine, N-myristoyl glycine, and N-cocoyl glycine, with one or more selected from N-lauroyl glutamic acid and N-myristoyl glutamic acid being more preferred. Furthermore, examples of salts of the N-acyl amino acid salt of component (c1') include alkali metal salts such as sodium and potassium.

[0035] From the viewpoint of effectively suppressing the expression of bitterness derived from ethanol of component (E) or bitterness derived from component (A), or the synergistic enhancement of bitterness by these, the content of component (E) in the liquid oral composition in a foam dispensing container of the present invention is preferably 1% by mass or more, more preferably 1.2% by mass or more, and even more preferably 1.5% by mass or more. Furthermore, from the viewpoint of further improving foam dissipation and more effectively reducing residual foam sensation, the content of component (E) in the liquid oral composition in a foam dispensing container of the present invention is preferably 1% by mass or more, more preferably 3% by mass or more, even more preferably 6% by mass or more, and even more preferably 10% by mass or more. Furthermore, from the viewpoint of effectively suppressing the expression of bitterness derived from ethanol of component (E) and bitterness derived from component (A), or the synergistic enhancement of bitterness by these, the content of component (E) in the liquid oral composition in a foam dispensing container of the present invention is preferably 15% by mass or less, more preferably 14% by mass or less, and even more preferably 12% by mass or less. Also, from the viewpoint of further improving foam dissipation and more effectively reducing residual foam sensation, the content of component (E) in the liquid oral composition in a foam dispensing container of the present invention is preferably 15% by mass or less, more preferably 14.5% by mass or less, and even more preferably 14% by mass or less. Furthermore, from the viewpoint of effectively suppressing the expression of bitterness derived from ethanol in component (E) or bitterness derived from component (A), or the synergistic enhancement of bitterness by these, the ethanol content of component (E) in the liquid oral composition in the foam dispensing container of the present invention is preferably 1% to 15% by mass, more preferably 1.2 to 14% by mass, and even more preferably 1.5 to 12% by mass. Also, from the viewpoint of further improving foam dissipation and more effectively reducing residual foam sensation, the ethanol content of component (E) in the liquid oral composition in the foam dispensing container of the present invention is preferably 1% to 15% by mass, more preferably 3 to 14.5% by mass, even more preferably 6 to 14% by mass, and even more preferably 10 to 14% by mass.

[0036] Furthermore, when using ethanol as component (E), the content of one or more selected components (c1') from N-acyl amino acids and their salts is preferably 0.005% by mass or more, more preferably 0.008% by mass or more, even more preferably 0.02% by mass or more, preferably less than 0.12% by mass, more preferably 0.11% by mass or less, and even more preferably 0.1% by mass or less in the liquid oral composition in a foam dispensing container of the present invention, from the viewpoint of effectively suppressing the expression or enhancement of bitterness derived from ethanol (E) and bitterness derived from component (A) while ensuring good effervescence.

[0037] Furthermore, when using ethanol as component (E) and containing one or more selected from N-acyl amino acids and their salts as component (c1'), the mass ratio ((E) / (c1')) of the content of component (E) to the content of component (c1') is preferably 20 or more, more preferably 30 or more, even more preferably 50 or more, preferably 600 or less, more preferably 400 or less, and even more preferably 200 or less, from the viewpoint of ensuring good effervescence while effectively suppressing the expression or enhancement of bitterness derived from ethanol of component (E) and bitterness derived from component (A).

[0038] Furthermore, when using ethanol as component (E) and containing one or more selected from N-acyl amino acids and their salts as component (c1'), the mass ratio ((c1') / (A)) of the content of component (c1') to the content of component (A) is preferably 0.1 or higher, more preferably 0.3 or higher, even more preferably 1 or higher, preferably 10 or lower, more preferably 9 or lower, and even more preferably 8 or lower, from the viewpoint of effectively suppressing the significant expression or enhancement of bitterness derived from component (A).

[0039] The liquid oral composition in a foaming dispenser of the present invention may contain water (F). In the present invention, the water in component (F) refers to the total water contained in the liquid oral composition in a foaming dispenser, including not only purified water or ion-exchanged water blended into the composition, but also the water contained in each of the blended components. By including such water in component (F), each component is well dispersed or dissolved, contributing to the development of excellent foaming properties and good foam dissipation, promoting a reduction in residual foam sensation, and ensuring a comfortable user experience.

[0040] The water content of component (F) is preferably 75% by mass or more, more preferably 76% by mass or more, even more preferably 77% by mass or more, preferably 99% by mass or less, more preferably 98% by mass or less, and even more preferably 97% by mass or less, in the liquid oral composition in a foam dispensing container of the present invention, from the viewpoint of contributing to the development of excellent foaming properties and good foam dissipation properties and promoting the reduction of residual foam sensation.

[0041] The liquid oral composition in a foam-dispensing container of the present invention preferably limits the content of abrasive powders. This ensures good dispensing from the container while exhibiting excellent foaming properties and good foam dissipation, thereby reducing residual foam. Examples of such abrasive powders include one or more selected from light calcium carbonate, heavy calcium carbonate, zeolite, abrasive silica with an oil absorption capacity of 50-150 mL / 100 g, dicalcium phosphate, tricalcium phosphate, insoluble sodium metaphosphate, aluminum hydroxide, magnesium phosphate, calcium pyrophosphate, and magnesium carbonate. The oil absorption capacity refers to the amount of oil that silica can support, and is determined by the amount of boiled linseed oil absorbed, according to the method based on JIS K5101-13-2 (established in 2004). The abrasive powder content in the foam-dispensing liquid oral composition of the present invention is preferably 0.5% by mass or less, more preferably 0.4% by mass or less, and even more preferably 0.3% by mass or less, or it is preferable that the foam-dispensing liquid oral composition of the present invention does not contain abrasive powder.

[0042] The liquid oral composition in a foam dispensing container of the present invention may, in addition to the above-mentioned components, appropriately contain, for example, humectants such as polyethylene glycol and propylene glycol; sweeteners such as saccharin or its salts; pH adjusters; fluorides; fragrances; colorants, etc., to the extent that they do not impair the effects of the present invention.

[0043] The liquid viscosity of the liquid oral composition in a foam dispensing container of the present invention at 25°C is preferably 1 mPa·s or more, more preferably 2 mPa·s or more, even more preferably 3 mPa·s or more, preferably 80 mPa·s or less, more preferably 50 mPa·s or less, even more preferably 40 mPa·s or less, even more preferably 35 mPa·s or less, and even more preferably 30 mPa·s or less. Furthermore, the foam viscosity of the liquid oral composition in a foam dispensing container of the present invention at 25°C is preferably 1 mPa·s or more and 80 mPa·s or less, more preferably 2 to 50 mPa·s, even more preferably 3 to 40 mPa·s, even more preferably 3 to 35 mPa·s, and even more preferably 3 to 30 mPa·s. Furthermore, liquid viscosity refers to the viscosity of the liquid in the form of the foam-dispensing liquid oral composition of the present invention, from the time it is dispensed from the nozzle to the outside, and is a value obtained by measuring it in the same manner as component (B) above.

[0044] The foaming ratio of the liquid oral composition in a foaming dispenser of the present invention is preferably 8 ml / g or more, more preferably 8.5 ml / g or more, and even more preferably 9 ml / g or more, immediately after being dispensed from the container, from the viewpoint of exhibiting excellent foaming properties while also showing excellent foam dissipation when spit out of the oral cavity after application and having good foaming properties. Furthermore, from the viewpoint of effectively reducing the feeling of unwanted residual foam, the foaming ratio of the liquid oral composition in a foaming dispenser of the present invention is preferably 40 ml / g or less, more preferably 30 ml / g or less, even more preferably 20 ml / g or less, and even more preferably 15 ml / g or less. The foaming ratio (ml / g) of the liquid oral composition in a foam dispensing container of the present invention refers to the value obtained by measuring the volume of foam immediately after it is dispensed from the container at 25°C and dividing this by the mass of the foam.

[0045] In the liquid oral composition in a foam dispensing container of the present invention, the percentage decrease in foam volume after gargling for 30 seconds relative to the foam volume immediately after dispensing from the container is preferably 25% or more, more preferably 26% or more, even more preferably 27% or more, preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less, from the viewpoint of exhibiting excellent foaming properties, having good foam dissipation properties, and effectively reducing the feeling of residual foam.

[0046] The percentage reduction in foam volume of the liquid oral composition in a foam dispensing container of the present invention refers to the value calculated by the following method. First, at 25°C, the foam volume measured immediately after dispensing from the container is defined as the "initial foam volume." Next, artificial saliva is added to the foam immediately after dispensing from the container, and the foam volume measured after stirring for 30 seconds is considered to be the foam immediately before being spat out of the oral cavity after being applied in the oral cavity for 30 seconds, and is defined as the "foam volume after application." The value is then calculated by substituting these "initial foam volume" and "foam volume after application" values ​​into the following formula (X). Percentage decrease in foam volume (%) = {(Initial foam volume - Foam volume after application) / Initial foam volume} × 100 ... (X)

[0047] The pH of the liquid oral composition in a foam dispensing container of the present invention at 25°C is preferably 5 to 11, and more preferably 6 to 10, from the viewpoint of ensuring a comfortable user experience.

[0048] The present invention provides a liquid oral composition in a foam dispensing container, which is prepared by mixing predetermined components, including the above components (A), (B), and optionally component (c1) or (c2), with a foam dispensing container equipped with a dispensing port. When using the liquid oral composition in a foam dispensing container of the present invention, the liquid oral composition, which is the contents of the foam dispensing container, is directly dispensed into the oral cavity from the dispensing port provided in the foam dispensing container, and the liquid oral composition that has passed through the dispensing port is applied to the oral cavity in a foamy state.

[0049] The foam dispensing container for filling the above-mentioned liquid oral composition can be any container equipped with a dispensing nozzle, and may be either a non-aerosol type container or an aerosol type container.

[0050] Non-aerosol containers are atmospheric pressure containers that do not require propellants such as compressed gas, and examples of such containers include squeeze-type containers and pump-type containers. From the viewpoint of forming foam with an appropriate foam viscosity as the contents pass through the discharge port, thereby providing a comfortable and lasting refreshing sensation, it is preferable that these containers have one or more porous members, such as a mesh or multiple small holes, interposed in the flow path of the contents from the container body to the discharge port. More specifically, a foam dispensing container filled with a liquid oral composition is preferably configured such that a porous member with a #50 to #400 mesh is interposed in the flow path of the contents from the container body to the dispensing port, more preferably a porous member with a #80 to #300 mesh is interposed, and even more preferably a porous member with a #90 to #250 mesh is interposed.

[0051] A squeeze-type container is one in which the body of a deformable container is squeezed to mix the contents with air pumped from within the headspace, passing through a porous material as needed, to form foam, which is then discharged from a discharge port. Specifically, for example, containers described in Japanese Patent Publication No. 7-215352, Japanese Utility Model Publication No. 58-174272, and Japanese Utility Model Publication No. 62-42787 can be used.

[0052] A pump-type container is a foam dispenser equipped with a pump head that, when pressed, mixes air flowing in from the outside with the contents, passing through a porous material as needed, to form foam, which is then discharged from the outlet. Typically, it includes an air cylinder for introducing air from the outside, a liquid cylinder that serves as a flow path for the contents, and a mixing chamber for mixing the air pumped by pressing the pump head with the contents. Specifically, for example, containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, and Japanese Utility Model Publication No. 3-7963 can be used.

[0053] An aerosol-type container is a container filled with compressed gas as a propellant, and when the contents are discharged from the outlet, bubbles are formed as gas is drawn in through a valve mechanism. Preferably, the compressed gas used is one that contains 90% or more by mass of carbon dioxide.

[0054] In particular, a squeeze container is preferred from the viewpoint of easily interposing a porous material with the above-mentioned mesh, from the viewpoint of easily discharging the contents directly into the oral cavity from the discharge port, and from the viewpoint of being convenient and portable.

[0055] The present invention provides a method of using a liquid oral composition in a foaming dispenser. For example, the composition is dispensed from the container onto a desired area in the oral cavity, such as the tongue, to create foam. After rinsing the mouth for 10 to 40 seconds to allow the composition to spread throughout the oral cavity, the composition is then spat out. The liquid oral composition in a foaming dispenser of the present invention exhibits excellent foaming properties, resulting in good foaming immediately after dispensing and providing high cleaning power, thus eliminating the need for brushing. Furthermore, the residual foaming sensation after rinsing is significantly reduced, eliminating the need to rinse the mouth with water or other liquids after spitting out the composition, allowing for an immediate and refreshing feeling. [Examples]

[0056] The present invention will be described in detail below based on examples. Unless otherwise specified in the table, the content of each component is expressed in mass percent.

[0057] [Examples 1-15, Comparative Examples 1-4] Each liquid oral composition was prepared according to Tables 1-3. The obtained liquid oral compositions were then filled into a squeeze-type container having a porous member (made of nylon) with two #90 / #200 meshes interposed in the content channel, or into a pump-type container having a porous member (made of nylon) with two #90 / #200 meshes interposed in the content channel, and the contents were discharged from the outlet to be used as a foamy dosage form. Measurements and evaluations were then performed according to the methods described below. The results are shown in Tables 1-3.

[0058] Measurement of liquid viscosity For each liquid oral composition before filling into containers, the viscosity (mPa·s) was measured at room temperature (25°C) after 1 minute from the start of measurement using a Type B viscometer (manufactured by Toki Sangyo Co., Ltd., M1 rotor, rotation speed: 30 rpm).

[0059] Foaming ratio (ml / g) Each obtained liquid oral composition was filled into a squeeze-type or pump-type container at 25°C. Then, a 22 ml container was filled with foam discharged from the squeeze-type or pump-type container, and the foam weight (g) for 22 ml of foam was measured. Next, the foaming ratio (ml / g) was determined by dividing the foam volume of 22 ml by the foam weight (g).

[0060] 《Percentage decrease in foam volume (%)》 Each obtained liquid oral composition was filled into a squeeze-type or pump-type container at 25°C, and 3g of foam was dispensed from the squeeze-type or pump-type container into a cup (mouth diameter: 57mm, height: 44mm, bottom diameter: 41mm). Next, 2g of artificial saliva was added to the foam immediately after it was dispensed from the container, and the foam was stirred for 30 seconds at 250rpm using a stirring blade (stirring rod diameter: 8mm, propeller diameter: 34mm, 3 blades). The foam volume after stirring was measured as the "foam volume after application". The value obtained by multiplying each 3g of foam by the foaming ratio value was defined as the "initial foam volume", and the decrease rate (%) of foam volume was calculated by substituting the "initial foam volume" and the "foam volume after application" into the above formula (X). As artificial saliva, an aqueous solution with a pH of approximately 6.5 containing calcium chloride (1.5 mM), potassium dihydrogen phosphate (5 mM), sodium chloride (5 mM), potassium chloride (20 mM), and sodium bicarbonate (3 mM) was used.

[0061] Ease of squeezing, or ease of pressing the pump. One g of foam was dispensed from either a squeeze-type or pump-type container filled with the obtained liquid oral composition, and the ease of dispensing was evaluated according to the following criteria. Depending on the container's usage, the stiffness of the squeeze-type container when pressed, or the stiffness of the pump when pressed in the pump-type container, was used as an evaluation indicator. This evaluation was conducted as a comprehensive assessment by three expert panelists. A: I didn't feel any hardness at all. B: It felt a little hard. C: It felt hard. D: It felt quite hard and was difficult to expel.

[0062] 《Evaluation of bitterness》 The resulting liquid oral composition was dispensed as foam (4g) from a squeeze-type or pump-type container, held in the mouth, rinsed for 20 seconds, and then spat out. The degree of bitterness felt in the mouth was then evaluated according to the following criteria. This evaluation was first performed by three expert panelists using a scoring system, and a rank from A to D was determined from the average score.

[0063] • Scoring 1 point: I didn't taste any bitterness at all. 2 points: I detected a very slight bitterness. 3 points: I felt a slight bitterness. 4 points: I could clearly taste the bitterness. • Ranking A: The average score was less than 1.6 points. B: The average score was between 1.6 and 2.5 points. C: The average score was between 2.5 and 3.0. D: The average score was 3.0 or higher.

[0064] [Table 1]

[0065] [Table 2]

[0066] Table 3

Claims

1. The following components (A) and (B): (A) Cationic disinfectant: 0.005% by mass or more, 0.08% by mass or less (B) Nonionic polysaccharide having a viscosity of 3 mPa·s or more and less than 6000 mPa·s at 25°C in a 2% by mass aqueous solution, and having hydrophilic groups: 0.05% by mass or more and 1% by mass or less It contains, The mass ratio ((B) / (A)) of the content of component (B) to the content of component (A) is between 1 and 22. The total content of anionic surfactants (c1) and amphoteric surfactants (c2) is less than 0.12% by mass, and A liquid oral composition in a foam dispensing container, wherein the mass ratio ((A) / {(c1)+(c2)}) of the content of component (A) to the total content of components (c1) and (c2) is 0.1 or more and 8 or less.

2. The following components (A) and (B): (A) Cationic disinfectant: 0.005% by mass or more, 0.08% by mass or less (B) Nonionic polysaccharide having a viscosity of 3 mPa·s or more and less than 6000 mPa·s at 25°C in a 2% by mass aqueous solution, and having hydrophilic groups: 0.05% by mass or more and 1% by mass or less It contains, and further contains ethanol (E) in an amount of 1% by mass or more and 15% by mass or less. The mass ratio ((B) / (A)) of the content of component (B) to the content of component (A) is between 1 and 22. The total content of anionic surfactants (c1) and amphoteric surfactants (c2) is less than 0.12% by mass, and A liquid oral composition in a foam dispensing container, wherein the content of component (c1) is 0.005% by mass or more and less than 0.12% by mass.

3. The liquid oral composition in a foam dispensing container according to claim 1 or 2, wherein the water (F) content is 75% by mass or more and 99% by mass or less.

4. A liquid oral composition in a foam-dispensing container according to any one of claims 1 to 3, wherein the foaming ratio is 8 ml / g or more, and the rate of decrease in foam volume after 30 seconds of gargling relative to the foam volume immediately after dispensing from the container is 25% or more.

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