JP2017226631A - Liquid oral composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid oral composition capable of exhibiting excellent low-temperature stability over a long period of time while securing the development of good foamability caused by an acylamino acid or a salt thereof in spite of containing a perfume.SOLUTION: There is provided a liquid oral composition having a pH of 6 or more at 25°C which comprises the following components (A), (B), (C) and (D): (A) 0.01 mass% or more and 0.3 mass% or less of an acylamino acid selected from acylglutamic acid and acylmethyltaurine or a salt thereof, (B) a perfume, (C) 0.1 mass% or more and 1.5 mass% or less of an amphoteric surfactant and (D) 50 mass% or more and 95 mass% or less of water, where the mass ratio ((B)/(C)) of the content of the component (B) to the content of the component (C) is 0.05 or more and 1.5 or less, and the content of a nonionic surfactant is lower than the content of the component (C).SELECTED DRAWING: None

Description

  The present invention relates to a liquid oral composition.

  Conventionally, liquid oral compositions have been developed that can exhibit various performances such as the effect of removing plaque or calculus adhering to the tooth surface, the effect of preventing caries, and the effect of removing colored stains. For example, Patent Document 1 discloses a composition for oral cavity in which N-acylamino acid such as acyl glutamate or a salt thereof, also known as a foaming agent, and pyrophosphoric acid or a salt thereof are used in a specific content and a specific mass ratio. The thing is disclosed and the removal performance of the protein dirt which exists in a tooth surface is improved.

  On the other hand, when blending a fragrance into a liquid oral composition, in order to promote the dissolution or dispersion of the fragrance, a nonionic surfactant such as polyoxyethylene hydrogenated castor oil is generally used, and foam performance is improved. An amphoteric surfactant is also used in combination. For example, Patent Document 2 discloses a foamy oral composition containing an amphoteric surfactant such as an imidazolinium betaine type together with a nonionic surfactant and a fragrance. Patent Document 3 discloses a composition for oral cavity that is in the form of a foam containing a carboxylic acid type amphoteric surfactant.

JP 2014-12655 A Japanese Patent Laid-Open No. 11-130647 JP 10-87457 A

  However, as described in Patent Document 1 described above, acylamino acids such as acylglutamate or salts thereof are excellent in foaming properties and dirt removal performance, but give good flavor in liquid oral compositions. Therefore, when this is used in combination with a fragrance compounded for this purpose, separation of each component, cloudiness, and the like may occur, and the stability of the composition may be reduced. In addition, as described in Patent Documents 2 to 3, even if a nonionic surfactant is added to promote the dissolution or dispersion of the fragrance, depending on the content of the nonionic surfactant, There is also a risk that the good foamability to be provided by amino acids or their salts may be reduced.

  Therefore, the present invention relates to a liquid oral composition that can exhibit excellent low-temperature storage stability over a long period of time while ensuring the expression of good foaming properties with an acylamino acid or a salt thereof while containing a fragrance.

  Therefore, the present inventor has made various investigations. As a result, a specific amount of an amphoteric surfactant is added to the fragrance with a specific amount ratio while the fragrance contains a specific acylamino acid or a salt thereof in a specific pH range. However, by limiting the content of the nonionic surfactant to a specific amount with respect to the amphoteric surfactant, while containing a fragrance, the acylamino acid or a salt thereof exhibits good foaming properties, It was found that a liquid oral composition capable of exhibiting excellent low-temperature storage stability was obtained.

That is, the present invention includes the following components (A), (B), (C), and (D):
(A) Acylamino acid selected from acylglutamic acid and acylmethyltaurine or a salt thereof 0.01% by mass to 0.3% by mass (B) Fragrance (C) Amphoteric surfactant 0.1% by mass to 1.5% (D) Water 50 mass% or more and 95 mass% or less are contained, and mass ratio ((B) / (C)) of content of a component (B) and content of a component (C) is 0.00. The present invention relates to a liquid oral composition having a pH of 05 or more and 1.5 or less, a nonionic surfactant content of not more than the content of component (C), and a pH at 25 ° C. of 6 or more.

  According to the composition for liquid oral cavity of the present invention, even when stored at a low temperature for a long time immediately after production, separation, white turbidity, etc. are generated while maintaining good foamability to be provided by acylamino acid or a salt thereof. It can suppress effectively and can contain a fragrance | flavor stably. Therefore, it is possible to impart a transparent or translucent appearance.

Hereinafter, the present invention will be described in detail.
The composition for liquid oral cavity of the present invention contains 0.01% by mass or more and 0.3% by mass or less of acylamino acid selected from acylglutamic acid and acylmethyltaurine or a salt thereof as component (A). By containing such a component (A) in a specific amount, excellent foamability can be exhibited while having good dirt removal performance.

  The acyl group of acylglutamic acid and acylmethyltaurine is a saturated or unsaturated linear or branched chain from the viewpoint of providing excellent low-temperature stability while maintaining good dirt removal performance, and ensuring good foamability. Derived from a fatty acid having a fatty acid or a mixed fatty acid thereof, preferably derived from a linear fatty acid or a mixed fatty acid of a linear fatty acid, preferably an acyl group having 6 to 22 carbon atoms, carbon More preferably, it is an acyl group of several 10-20, and more preferably an acyl group of 12-18 carbon atoms. The acyl group is preferably one or more selected from a capryloyl group, a lauroyl group, a myristoyl group, a palmitoyl group, a stearoyl group, and a cocoyl group from the viewpoint of foaming of the liquid oral composition and ease of handling. , One or more selected from lauroyl, myristoyl, and cocoyl groups are more preferable, and one or more selected from lauroyl and myristoyl are more preferable.

  The glutamic acid that is the amino acid part of acylglutamic acid may be any of D-form, L-form, or a mixture of D-form and L-form, and is preferably L-form. Specifically, the acyl glutamic acid is preferably one or more selected from N-lauroyl glutamic acid, N-myristoyl glutamic acid, N-cocoyl glutamic acid, and N-lauroyl aspartic acid, and N-lauroyl glutamic acid, and One or two selected from N-myristoyl glutamic acid is more preferable.

  Acyl methyl taurine includes palm oil fatty acid methyl taurine, N-caproyl methyl taurine, N-lauroyl methyl taurine, N-myristoyl methyl taurine, N-palmitoyl methyl taurine, N-stearoyl methyl taurine, and N-oleoyl methyl taurine 1 type or 2 or more types selected from are preferable, and 1 type or 2 types selected from N-lauroylmethyltaurine and N-myristoylmethyltaurine are more preferable.

  Examples of salts of these acylamino acids include alkali metal salts such as sodium and potassium; alkaline earth metal salts such as calcium and magnesium; other inorganic salts such as aluminum and zinc; ammonium salts; monoethanolamine, diethanolamine and triethanolamine And organic amine salts such as arginine, lysine, histidine, ornithine and the like. These may be used alone or in combination of two or more. Especially, as a salt of acylamino acid salt, an alkali metal salt is preferable and a sodium salt is more preferable from the viewpoint of flavor and availability.

  The content of the component (A) is 0.01% by mass or more and preferably 0.02% by mass in the liquid oral composition of the present invention from the viewpoint of ensuring good foamability and dirt removal performance. % Or more, and more preferably 0.05% by mass or more. Moreover, content of a component (A) is 0.3 mass% or less in the liquid oral composition of this invention from a viewpoint of ensuring the favorable flavor brought about by the component (B) mentioned later, Preferably it is 0.25 mass% or less, More preferably, it is 0.22 mass% or less. And the content of a component (A) is 0.01 mass% or more and 0.3 mass% or less in the liquid oral cavity composition of this invention, Preferably it is 0.02-0.25 mass%. Yes, more preferably 0.05 to 0.22% by mass.

  The liquid oral cavity composition of this invention contains a fragrance | flavor as a component (B). If it is the composition for liquid oral cavity of this invention, the low-temperature storage stability excellent over the long term can be exhibited, ensuring favorable flavor by containing this component (B).

  Examples of the component (B) include peppermint oil, spearmint oil, cinnamon oil, anise oil, eucalyptus oil, wintergreen oil, cassia oil, clove oil, thyme oil, sage oil, sage clary oil, nutmeg oil, funnel oil, lemon Oil, orange oil, peppermint oil, cardamom oil, coriander oil, basil oil, mandarin oil, lime oil, lavender oil, rosemary oil, ginger oil, grapefruit oil, laurel oil, camomil oil, caraway oil, marjoram oil, Natural fragrance ingredients such as bay oil, lemongrass oil, lemon balm oil, pimento berry oil, palmarosa oil, olivenum oil, pine needle oil, pettigren oil, neroli oil, rose oil, jasmine oil, and these natural fragrance ingredients were processed. Perfume ingredients: menthol, pretol, carvone, a Thor, cineol, methyl salicylate, cinnamic aldehyde, eugenol, 3-1 -menthoxypropane-1,2-diol, thymol, citronellyl acetate, linalool, linalyl acetate, geraniol, geranyl acetate, citronellol, limonene, menthone, menthyl Acetate, N-substituted-paramentane-3-carboxamide, pinene, octylaldehyde, citral, pulegone, carbyl acetate, dihydrocarbyl acetate, anisaldehyde, benzaldehyde, camphor, lactone, ethyl acetate, ethyl butyrate, allyl cyclohexyl propionate , Methyl anthranilate, ethyl methyl phenyl glycidate, vanillin, undecalactone, hexanal, butyl acetate , Isoamyl acetate, hexenol, dimethyl sulfide, cycloten, furfural, trimethylpyrazine, ethyl lactate, methyl lactate, ethyl thioacetate, etc. Examples of the flavoring ingredients include flavors, milk flavors, fruit mix flavors, and tropical fruit flavors.

  The content of the component (B) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, in the liquid oral composition of the present invention, from the viewpoint of good flavor. The liquid oral composition of the present invention can be suitably used even when it is contained in an amount of 0.4% by mass or more, and ensures low-temperature storage stability over a long period of time, as well as bitterness, saltiness, irritation, etc. From the viewpoint of suppressing an unpleasant taste, it is preferably 1.5% by mass or less, more preferably 1.2% by mass or less, and further preferably 1% by mass or less.

  The composition for liquid oral cavity of the present invention contains 0.1% by mass or more and 1.5% by mass or less of an amphoteric surfactant as the component (C). By containing the component (C) in a specific amount and having a specific quantitative relationship with the component (B), the component (B) is excellent over a long period from immediately after production to after low-temperature storage. High stability can be expressed by dissolving or dispersing in.

  As the amphoteric surfactant of component (C), betaine acetate such as lauryldimethylaminoacetic acid betaine; imidazolinium betaine such as 2-alkyl-N-carboxymethyl-N-hydroxyethyl-N-imidazolium betaine; lauryl sulfone 1 selected from alkylsulfobetaines such as betaine and laurylhydroxysulfobetaine; coconut oil fatty acid amide alkylbetaines such as coconut oil fatty acid amidepropylbetaine; and long-chain alkylimidazoline betaine salts such as sodium N-alkyl-1-hydroxyethylimidazoline betaine A seed | species or 2 or more types is mentioned. Among these, from the viewpoint of effectively suppressing the generation of precipitates at a low temperature and from the viewpoint of feeling of use, one or more selected from coconut oil fatty acid amide alkylbetaines and alkylsulfobetaines are preferable. Fatty acid amide alkyl betaines are more preferable, coconut oil fatty acid amide alkyl betaines having 2 to 5 carbon atoms of alkyl are more preferable, and coconut oil fatty acid amide propyl betaines are more preferable.

  The content of the component (C) is 0.1% by mass or more in the liquid oral composition of the present invention from the viewpoint of satisfactorily dissolving or dispersing the component (B) even after long-term storage at a low temperature. Thus, it is preferably 0.2% by mass or more, and more preferably 0.4% by mass or more. Moreover, content of a component (C) is 1.5 mass% or less in the liquid oral cavity composition of this invention from a viewpoint which ensures the outstanding usability, such as favorable flavor, Preferably it is 1 .2% by mass or less, more preferably 1% by mass or less. And content of a component (C) is 0.1 to 1.5 mass% in the liquid oral cavity composition of this invention, Preferably it is 0.2 to 1.2 mass% Yes, more preferably 0.4 to 1% by mass.

  In the composition for liquid oral cavity of the present invention, the mass ratio ((B) / (C)) of the content of the component (B) and the content of the component (C) has an excellent feeling of use such as a good flavor. From the viewpoint of ensuring, it is 0.05 or more, preferably 0.1 or more, and more preferably 0.2 or more. Moreover, the mass ratio ((B) / (C)) of the content of the component (B) and the content of the component (C) dissolves the component (B) well even after long-term storage at a low temperature. From the viewpoint of dispersion, it is 1.5 or less, preferably 1.2 or less, more preferably 1 or less.

  In the composition for liquid oral cavity of the present invention, the mass ratio ((B) / ((A) + (C))) of the content of component (B) and the total content of component (A) and component (C). Is preferably 0.008 or more, more preferably 0.18 or more, from the viewpoint of satisfactorily dissolving or dispersing the component (B) even after storage at a low temperature for a long time while maintaining good foamability. More preferably, it is 0.38 or more. Moreover, mass ratio ((B) / ((A) + (C))) of content of a component (B) and total content of a component (A) and a component (C) is excellent, such as favorable flavor. From the viewpoint of securing the feeling of use, it is preferably 1.3 or less, more preferably 1.1 or less, and even more preferably 0.9 or less.

  The composition for liquid oral cavity of the present invention contains 50% by mass or more and 95% by mass or less of water as the component (D). The water of component (C) in the present invention includes not only purified water and ion exchange water blended in the liquid oral composition, but also water contained in each blended component in the liquid oral composition. Means the total moisture contained. By containing such component (C) water, each component can be dispersed or dissolved satisfactorily and diffused well in the oral cavity, while maintaining a good appearance and usability.

  The content of the component (D) is 50% by mass or more, preferably 55% by mass or more, in the liquid oral composition of the present invention, from the viewpoint of securing a good appearance and usability. Preferably it is 60 mass% or more. In addition, the content of the component (D) is good in terms of ensuring good appearance and feeling of use such as flavor, and when the liquid oral cavity composition of the present invention is filled in a foam discharge container, good foam quality and container From the viewpoint of maintaining the dischargeability from the liquid oral cavity composition of the present invention, it is 95% by mass or less, preferably 90% by mass or less, more preferably 85% by mass or less, and still more preferably. Is 75% by mass or less. And content of a component (D) is 50 to 95 mass% in the liquid oral cavity composition of this invention, Preferably it is 55-90 mass%, More preferably, it is 60-85. % By mass.

  In the composition for liquid oral cavity of the present invention, the content of nonionic surfactant such as polyoxyethylene hydrogenated castor oil is not more than the content of component (C). Thus, by restricting the content of the nonionic surfactant relative to the content of the component (C), the component (B) can be dissolved or dispersed well even after storage at a low temperature for a long time. It is possible to ensure a good foaming property provided by A).

  The content of the nonionic surfactant is selected from the viewpoints of ensuring good foamability, suppressing the increase in liquid viscosity when subjected to low temperature storage, and ensuring stability when stored at high temperatures. C) or less, preferably 0.5 times or less, more preferably 0.2 times or less with respect to the content of component (C). Further, the content of the nonionic surfactant is preferably 1% by mass or less, more preferably 0.5% by mass or less, and further preferably from the same viewpoint in the liquid oral composition of the present invention. Is 0.2% by mass or less, more preferably 0.1% by mass or less, or the liquid oral composition of the present invention preferably contains no nonionic surfactant.

  The liquid oral composition of the present invention preferably contains an alkyl sulfate as the component (E) from the viewpoint of improving foamability. Examples of the component (E) include sodium lauryl sulfate, sodium myristyl sulfate, sodium palmityl sulfate, sodium stearyl sulfate, sodium octyl sulfate, and sodium capryl sulfate. When the component (E) is contained, the mass ratio of the content of the component (E) and the content of the component (C) ((E) / (C )) Is preferably 1.7 or less, more preferably 1.5 or less, still more preferably 1.3 or less, and preferably 0.1 or more from the viewpoint of improving foamability. More preferably, it is 0.2 or more, More preferably, it is 0.4 or more.

  When the component (E) is contained, the mass ratio ((E) / (A)) between the content of the component (E) and the content of the component (A) is preferably from the viewpoint of improving foamability. Is 1 or more, more preferably 2 or more, and still more preferably 3 or more. Further, the mass ratio ((E) / (A)) between the content of the component (E) and the content of the component (A) is preferably 50 or less from the viewpoint of effectively ensuring long-term low-temperature storage stability. More preferably, it is 30 or less, More preferably, it is 25 or less, More preferably, it is 15 or less.

  Further, when the component (E) is contained, the content of the component (E) is preferably 0.1% by mass or more in the liquid oral composition of the present invention from the viewpoint of improving foamability. More preferably, it is 0.2% by mass or more, and further preferably 0.3% by mass or more. In addition, the content of the component (E) is preferably 1.5% by mass or less, more preferably in the liquid oral composition of the present invention, from the viewpoint of effectively ensuring long-term low-temperature storage stability. It is 1.2 mass% or less, More preferably, it is 1 mass% or less.

  In the liquid oral cavity composition of the present invention, the content of ethanol is restricted from the viewpoint of securing excellent foamability while dissolving or dispersing component (B) and maintaining a good feeling of use. Preferably, even if the ethanol content is limited, the solubility or dispersibility of each component can be ensured and the low-temperature storage stability over a long period of time can be satisfactorily maintained. The content of ethanol is preferably 20 times or less, more preferably 15 times or less, still more preferably 10 times or less with respect to the content of component (B). In addition, from the same viewpoint, the content of ethanol is preferably 8% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less in the liquid oral composition of the present invention. Alternatively, the liquid oral composition of the present invention preferably does not contain ethanol.

In the liquid oral cavity composition of the present invention, while ensuring the solubility or dispersibility of each component, the viewpoint of imparting a transparent or translucent appearance, and good dischargeability when filled in a foam discharge container From the viewpoint of holding, it is preferable to limit the content of the abrasive powder. Examples of the abrasive powder include light calcium carbonate, heavy calcium carbonate, zeolite, abrasive silica having an oil absorption of 50 to 150 mL / 100 g, dicalcium phosphate, tricalcium phosphate, insoluble sodium metaphosphate, aluminum hydroxide. 1 type (s) or 2 or more types chosen from magnesium phosphate, calcium pyrophosphate, magnesium carbonate, etc. are mentioned.
The amount of oil absorption indicates the amount of oil that can be supported by silica, and the measuring method is specified by the method based on JIS K5101-13-2 (established in 2004) and specified by the amount of oil that is absorbed in the boiled sea bream. To do.

  The content of the abrasive powder provides a transparent or translucent appearance from the viewpoint of ensuring the solubility or dispersibility of each component, particularly the component (B), even after long-term storage at a low temperature. From the viewpoint, in the liquid oral cavity composition of the present invention, it is preferably 0.1% by mass or less, more preferably 0.05% by mass or less, still more preferably 0.01% by mass or less, or The liquid oral composition of the present invention preferably contains no abrasive powder.

The liquid oral composition of the present invention has a pH at 25 ° C. of 6 or more, preferably 6 from the viewpoint of ensuring the solubility or dispersibility of each component and effectively enhancing long-term low-temperature storage stability. 0.5 or more, more preferably 7 or more, further preferably 7.5 or more, preferably 11 or less, more preferably 10.8 or less, and even more preferably 10.5 or less. .
In addition, when adjusting pH in 25 degreeC of the liquid oral cavity composition of this invention to the said range, you may use a pH adjuster. Examples of such pH adjusters include carbonates and bicarbonates; potassium hydroxide and sodium hydroxide; organic acids such as citric acid, malic acid, lactic acid, tartaric acid, and succinic acid, or salts thereof. The above is mentioned. Of these, carbonates and bicarbonates are preferable, and sodium carbonate, sodium bicarbonate, and sodium sesquicarbonate are preferable. In this case, the content of the pH adjusting agent is preferably 0.1 to 2% by mass, more preferably in the liquid oral composition of the present invention, from the viewpoint of stabilizing the pH of the liquid oral composition. Is 0.15 to 1.5% by mass, more preferably 0.18 to 1% by mass, and still more preferably 0.2 to 0.8% by mass.

In addition to the above components, the liquid oral composition of the present invention has a binding agent such as sodium alginate, carboxymethylcellulose or a salt thereof, hydroxyethylcellulose, carrageenan, xanthan gum; glycerin, A polyol such as propylene glycol, butylene glycol, and polyethylene glycol; a preservative; a pigment; a dye, and the like can be appropriately contained. Among them, the mass average molecular weight of polyethylene glycol is preferably 1000 or less from the viewpoint of effectively preventing clogging of the porous member of the foam discharge container when the liquid oral composition of the present invention is filled in the foam discharge container. More preferably, it is 850 or less, and from the viewpoint of good foam quality, it is preferably 200 or more, more preferably 400 or more. From the viewpoint of effectively preventing clogging of the porous member of the foam discharge container when filling the liquid oral composition of the present invention into the foam discharge container, the content of the polyol that is liquid at 20 ° C. is preferably 10 It is at least mass%, more preferably at least 15 mass%, preferably at most 40 mass%, more preferably at most 35 mass%.
The average molecular weight of the polyethylene glycol means a mass average molecular weight measured by GPC (gel permeation chromatography).

  The liquid oral composition of the present invention is foamed, and is applied to the oral cavity in the form of foam, from the viewpoint of spreading the liquid oral composition to every corner of the oral cavity while realizing an excellent feeling of use. The container is preferably filled. Such a foam discharge container may be provided with a discharge port, and may be a non-aerosol type container or an aerosol type container. When using the liquid oral cavity composition of the present invention, the liquid oral cavity composition is directly discharged into the oral cavity from the discharge port provided in the foam discharge container, and the liquid oral cavity via the discharge port The composition for application can be applied to the oral cavity in the form of foam.

  Non-aerosol type containers are atmospheric pressure containers that do not require a propellant such as compressed gas. Examples of such containers include squeeze type containers and pump type containers. These containers have a viewpoint of forming a foamy composition satisfactorily when the contents pass through the discharge port, and the formed foam has good retention and homogeneity, and enhances the feeling of use, etc. From this point of view, it is preferable that any of these is a container in which a porous member provided with a mesh or a plurality of small holes is interposed in the flow path of the contents from the container main body to the discharge port.

  A squeeze-type container is a squeeze-deformed body that is located in a deformable container body, which mixes the air and contents pumped from the headspace while passing through a porous member as necessary. Bubbles are formed, and the bubbles are discharged from the discharge port. Specifically, for example, containers described in JP-A-7-215352, JP-A 58-174272, and JP-A 62-42787 can be used.

  A pump type container is a foam that mixes air and contents flowing in from the outside while passing through a porous member as needed by pushing a pump head provided in a foam discharger having a discharge port. And the bubbles are discharged from the discharge port. Usually, an air cylinder for allowing air to flow in from the outside and a liquid cylinder serving as a flow path for the contents are provided, and a mixing chamber for mixing the air and the contents that are pumped by the pump head being pushed in. Specifically, for example, containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-3-7963 can be used.

  An aerosol-type container is a container filled with compressed gas as a propellant. When the contents are discharged from the discharge port, bubbles are formed while taking in the gas through the valve mechanism. The compressed gas to be used is preferably a gas containing 90% by mass or more of carbon dioxide gas.

  Among these foam discharge containers, a squeeze container is preferable from the viewpoint of usability, that is, from the viewpoint of easily discharging contents from the discharge port directly into the oral cavity, and from the viewpoint of excellent convenience and portability. A container having a mesh of # 90 to # 305 is more preferable in the flow path of the contents up to the outlet.

  Since the liquid oral composition of the present invention can stably dissolve or disperse the component (B) even after long-term storage at a low temperature, it may be transparent or translucent and may be colored. . Specifically, the term “transparent or translucent” means that the transmittance of light having an absorption wavelength of 550 nm when a liquid oral composition is filled in a cell having an optical path length of 10 mm is 80% or more. The transmittance is preferably 90% or more. A quartz cell is used as the cell.

  Hereinafter, the present invention will be specifically described based on examples. In addition, unless otherwise indicated in a table | surface, content of each component shows the mass%.

  Hereinafter, the present invention will be specifically described based on examples. In addition, unless otherwise indicated in a table | surface, content of each component shows the mass%.

[Examples 1-14, Comparative Examples 1-4]
According to the prescription shown in Tables 1-2, the liquid oral cavity composition which adjusted pH at 25 degreeC to 10 was manufactured, and each evaluation was performed according to the following methods.
The results are shown in Tables 1-2.
Moreover, in the composition for liquid oral cavity of this invention, the specific fragrance | flavor which can be used as a fragrance | flavor of a component (B) is shown to Tables 4-6. In Examples 1 to 15 and Comparative Examples 1 to 4, the fragrances shown in Table 4 were used.

<< Appearance immediately after production >>
Each liquid oral composition obtained was filled into a glass bottle, and the liquid oral composition of the contents was visually observed from the outside of the glass bottle and evaluated according to the following criteria.
A: Transparent and uniform B: Although it was somewhat cloudy, it was uniform C: Although it was cloudy, even the deposit was not confirmed D: Separation or deposit was confirmed

<< Low temperature stability (appearance after storage at -5 ° C for 10 days) >>
Each liquid oral composition obtained was filled into a glass bottle and stored at −5 ° C. for 10 days, and then the liquid oral composition of the contents was visually observed from the outside of the glass bottle. Evaluation was performed according to the same criteria.

<< Low temperature stability (viscosity after storage at -5 ° C for 10 days) >>
Each liquid oral composition obtained was filled in a glass bottle and stored at −5 ° C. for 10 days, and then a BL viscometer (manufactured by Toki Sangyo Co., Ltd., M1 rotor, rotation speed: 30 rpm / 1 minute) was used. The liquid viscosity (mPa · s) was measured while maintaining at −5 ° C.

《Bubble viscosity》
100 g of each liquid composition for oral cavity thus obtained is filled into a pump former container (F5 pump former, mesh: 2 sheets, mesh size: # 255 / # 255, Daiwa Seikan Co., Ltd.) The product was discharged, and the foam viscosity (mPa · s) was measured at room temperature (25 ° C.) using a BH viscometer (manufactured by Toki Sangyo Co., Ltd., H2 rotor, rotation speed: 5 rpm / 1 minute).

《Bubble holding》
100 g of the obtained liquid oral cavity composition was filled in the above-mentioned pump former container, and at the room temperature (25 ° C.), five filter papers (ADVANTEC No. 1, 70 mm) were stacked and about 1 g from the discharge port. The contents were discharged. Bubbles were wiped off when 30 seconds had elapsed after discharge, the change in the weight of the filter paper was measured (drainage amount), and the drainage rate (%) was calculated from the following formula. A lower drainage rate means better foam retention.
Drainage rate (%) = (drainage amount) / (foam discharge weight) × 100

[Example 15]
The liquid oral composition produced by adjusting the pH at 25 ° C. to 10 according to the formulation shown in Table 3 exhibits excellent low-temperature storage stability over a long period of time and has high transparency.

Claims (9)

The following components (A), (B), (C) and (D):
(A) Acylamino acid selected from acylglutamic acid and acylmethyltaurine or a salt thereof 0.01% by mass to 0.3% by mass (B) Fragrance (C) Amphoteric surfactant 0.1% by mass to 1.5% (D) Water 50 mass% or more and 95 mass% or less are contained, and mass ratio ((B) / (C)) of content of a component (B) and content of a component (C) is 0.00. A liquid oral composition, which is 05 or more and 1.5 or less, the nonionic surfactant content is less than or equal to the component (C) content, and the pH at 25 ° C. is 6 or more.   The alkyl sulfate (E) is contained, and the mass ratio ((E) / (C)) between the content of the component (E) and the content of the component (C) is 1.7 or less. The composition for liquid oral cavity according to 2.   The composition for liquid oral cavity according to claim 2, wherein the mass ratio ((E) / (A)) of the content of the component (E) and the content of the component (A) is 1 or more and 50 or less.   The composition for liquid oral cavity according to claim 2 or 3, wherein the content of the component (E) is 0.1% by mass or more and 1.5% by mass or less.   Content of a component (B) is 0.1 to 1.5 mass%, The liquid oral composition of any one of Claims 1-4.   The liquid oral composition according to any one of claims 1 to 5, wherein the content of ethanol relative to the content of component (B) is 20 times or less.   Content of abrasive powder is 0.1 mass% or less, The liquid oral cavity composition of any one of Claims 1-6.   The composition for liquid oral cavity according to any one of claims 1 to 7, which is filled in a foam discharge container.   It is transparent or translucent, The liquid oral cavity composition of any one of Claims 1-8.