Foam leave-on cosmetics

Abstract

To provide foam leave-on cosmetics that feature excellent quality of the dispensed foam, quick foam dissolution upon skin application, and sufficient foaming even at low temperatures.SOLUTION: Foam leave-on cosmetics contain following components (A)-(D). (A) Gemini amphiphilic compound: 0.02 mass% or more and 0.7 mass% or less. (B) Polyoxyethylene hardened castor oil with an average addition of 30 or more moles of ethylene oxide: 0.05 mass% or more and 0.6 mass% or less. (C) Polyoxyalkylene alkyl ether with an average addition of 10 or more moles of alkylene oxide: 0.02 mass% or more and 0.6 mass% or less. (D) Water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a leave-on cosmetic that is dispensed as a foam. [Background technology]

[0002] Leave-on cosmetics in the form of lotions, emulsions, mists, etc. are used to impart a moisturizing feel to skin and hair. Known examples of such cosmetics include a moisturizing cosmetic containing trimethylglycine, a water-soluble alkylene oxide derivative that is liquid at 25°C, and a polyhydric alcohol (Patent Document 1), and a cosmetic containing (a) polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide addition moles of 30 to 80, (b) one or more compounds selected from betaine-type low-molecular-weight compounds, polyhydric alcohols, and alkylene oxide derivatives, and (c) a polyalkylene glycol that is solid at 25°C (Patent Document 2). These leave-on cosmetics are typically in the form of liquids, emulsions, creams, mist, or gels, and are applied to the skin or hair by hand or as a mist.

[0003] Meanwhile, a technology has been reported in which these leave-on cosmetics are filled into a pump former container or the like and discharged in foam form to produce cosmetics to be applied to the skin or hair. For example, Patent Document 3 describes an external composition for a screen former that contains a phospholipid in addition to a nonionic surfactant as a foaming component, with the aim of reducing skin irritation and improving moisturizing function, which are issues with foam cosmetics. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-14540 [Patent Document 2] Japanese Patent Publication No. 2020-158433 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-121145 Summary of the Invention [Problem to be solved by the invention]

[0005] However, it has been found that the cosmetics described in Patent Documents 1 and 2, which are filled in a container that dispenses the leave-on cosmetic composition as a foam, and the foam-like leave-on cosmetic composition described in Patent Document 3, which contains one or more nonionic surfactants as a foaming component, have problems such as insufficient quality of the dispensed foam, slow disappearance of the foam after application to the skin, and insufficient foaming ability at low temperatures. Therefore, the present invention relates to a foamy leave-on cosmetic that produces a good quality foam when discharged, that dissipates quickly after application to the skin, and that foams sufficiently even at low temperatures. [Means for solving the problem]

[0006] Therefore, the present inventors filled a foam-dispensing container with cosmetics containing various surfactants and other ingredients to produce leave-on cosmetics that are dispensed as foam, and investigated the feel when used, foam characteristics, and foaming ability at low temperatures.As a result, they found that by blending a specific amount of polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide added moles of 30 or more, a polyoxyalkylene alkyl ether having an average number of alkylene oxide added moles of 10 or more, and water, in addition to a specific amount of a gemini amphiphilic compound, it is possible to obtain a foam-type leave-on cosmetic that dispenses good quality foam, has a fast foam disappearance rate after application to the skin, etc., and foams sufficiently even at low temperatures, and has a good feel when used, thereby completing the present invention.

[0007] That is, the present invention provides a foamy leave-on cosmetic preparation containing the following components (A) to (D): (A) 0.02% by mass or more and 0.7% by mass or less of a gemini amphiphilic compound; (B) 0.05% by mass or more and 0.6% by mass or less of polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide added of 30 or more; (C) 0.02% by mass or more and 0.6% by mass or less of polyoxyalkylene alkyl ether having an average addition mole number of alkylene oxide of 10 or more, (D)Water [Effects of the Invention]

[0008] The foamy leave-on cosmetic of the present invention has good quality of discharged foam, the foam disappears quickly after application to the skin, and foams sufficiently even at low temperatures, providing a good feel when used. DETAILED DESCRIPTION OF THE INVENTION

[0009] One embodiment of the foamy leave-on cosmetic preparation of the present invention contains the following components (A) to (D). (A) 0.02% by mass or more and 0.7% by mass or less of a gemini amphiphilic compound; (B) 0.05% by mass or more and 0.6% by mass or less of polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide added of 30 or more; (C) 0.02% by mass or more and 0.6% by mass or less of polyoxyalkylene alkyl ether having an average addition mole number of alkylene oxide of 10 or more, (D)Water

[0010] The leave-on cosmetic in the present invention means a cosmetic that is not washed off after application, and examples thereof include lotion, serum, emulsion, cream, sunscreen, and the like. A foam leave-on cosmetic is a leave-on cosmetic that is filled into a foam-dispensing container and dispensed as a foam. Therefore, the cosmetic of the present invention is a leave-on cosmetic that is dispensed as a foam and applied to the skin, hair, etc.

[0011] Component (A) used in the present invention is a gemini amphiphilic compound. Gemini amphiphilic compounds are amphiphilic compounds formed by two acyl group-bonded hydrophilic residues linked via a spacer, and examples of such compounds include the acyl derivatives represented by general formula (1) described in Japanese Patent No. 4629318.

[0012] [ka]

[0013] (X is a spacer consisting of a linear, branched, cyclic, or aromatic hydrocarbon chain having a molecular weight of 1,000,000 or less, Z 1 is -O-, -S-, or -NR 4 -(R 4 represents a hydrogen atom, or an alkyl group, alkenyl group, aryl group, or alkylaryl group having 1 to 10 carbon atoms), Z 2 is -O-, -S-, or -NR 5 -(R 5 is a hydrogen atom, or an alkyl group, alkenyl group, aryl group, or alkylaryl group having 1 to 10 carbon atoms, and R 1 CO is a long-chain acyl group derived from saturated or unsaturated fatty acids having 1 to 20 carbon atoms; R 2 represents a hydrogen atom, a hydroxyl group, a carboxyl group, or an alkyl group having 1 to 3 carbon atoms which may have a substituent other than these; R 3 is a hydrogen atom or an alcohol compound residue resulting from esterification of an alcohol, j and k are each independently 0, 1, or 2, and j and k are not simultaneously 0, n is an integer of 2 to 20, and all R 3 are never hydrogen atoms at the same time.)

[0014] More preferred component (A) is a compound represented by the general formula (2) described in the above-mentioned Japanese Patent No. 4629318:

[0015] [ka]

[0016] (R 11 and R 12 are the same or different and represent N-long chain acyl acidic amino acid residues, and X 2 indicates a basic amino acid residue or an alkylenediamine residue) The compound may be one or more selected from the compounds represented by the following formula: Here, the N-long-chain acyl acidic amino acid residue and the basic amino acid residue or alkylenediamine residue are linked by an amide bond between the carboxyl group of the N-long-chain acyl acidic amino acid residue and the amino group of the basic amino acid residue or alkylenediamine residue.

[0017] Examples of acidic amino acids include glutamic acid, aspartic acid, lanthionine, β-methyllanthionine, cystathionine, dienecholic acid, felinine, aminomalonic acid, β-oxyaspartic acid, α-amino-α-methylsuccinic acid, β-oxyglutamic acid, γ-oxyglutamic acid, γ-methylglutamic acid, γ-methyleneglutamic acid, γ-methyl-γ-oxyglutamic acid, α-aminoadipic acid, α-amino-γ-oxyadipic acid, α-aminopimelic acid, α-amino-γ-oxypimelic acid, β-aminopimelic acid, α-aminosuberic acid, α-aminosebacic acid, pantothenic acid, etc. Of these, glutamic acid and aspartic acid are more preferred.

[0018] Examples of the long-chain acyl group bonded to the amino group of the acidic amino acid include saturated or unsaturated aliphatic acyl groups having 6 to 24 carbon atoms, such as caproyl, capryl, decanoyl, lauroyl, myristoyl, palmitoyl, and stearoyl groups.

[0019] Basic amino acids include lysine, arginine, and histidine. Examples of alkylenediamines include alkylenediamines having 2 to 12 carbon atoms, and specific examples thereof include ethylenediamine, N,N'-dimethylethylenediamine, diaminopropane, Examples thereof include diaminobutane, diaminopentane, diaminohexane, diaminoheptane, diaminooctane, diaminononane, diaminodecane, and diaminododecane.

[0020] More preferred component (A) is a compound represented by the general formula (2): 11 and R 12are the same or different and are N-C6 to N-C24 saturated or unsaturated aliphatic acyl glutamic acid residues or N-C6 to N-C24 saturated or unsaturated aliphatic acyl aspartic acid residues, and X 2 is a lysine residue, an arginine residue, or a histidine residue. 11 and R 12 is an N-lauroylglutamic acid residue, and X 2 is a lysine residue (Sodium dilauroyl glutamate lysine (Pellicer (manufactured by Asahi Kasei Finechem Co., Ltd.))).

[0021] The gemini amphiphilic compound of component (A) can be used alone or in combination with two or more. The content in the composition of the present invention is preferably 0.02% by mass or more, more preferably 0.03% by mass or more, and even more preferably 0.05% by mass or more, from the viewpoints of improving foam quality, foaming ability at low temperatures, and feel after application. Furthermore, from the viewpoints of accelerating the rate at which foam disappears after application and improving the feel after application, the content is preferably 0.7% by mass or less, more preferably 0.6% by mass or less, and even more preferably 0.5% by mass or less. Specifically, the content is preferably 0.02% by mass or more to 0.7% by mass or less, more preferably 0.03% by mass or more to 0.6% by mass or less, and even more preferably 0.05% by mass or more to 0.5% by mass or less. Here, the content of each component in the composition of the present invention is the content in the composition filled in a foam-dispensing container.

[0022] The component (B) used in the present invention is a polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide added of 30 or more moles. From the viewpoints of improving foam quality, foaming ability at low temperatures, and feel after application, the polyoxyethylene hydrogenated castor oil of component (B) is preferably solid at 25° C., and more preferably vaseline-like or waxy at 25° C. In this specification, "solid at 25° C." refers to a state in which the oil does not have fluidity in an environment of 25° C. under 1 atmosphere, i.e., a state under temperature conditions below the melting point (for amorphous substances without a melting point, a state under temperature conditions below the melting point), and "liquid at 25° C." refers to a state in which the oil has fluidity in an environment of 25° C. under 1 atmosphere, i.e., a state under temperature conditions above the melting point (for amorphous substances without a melting point, a state under temperature conditions above the melting point).

[0023] The average number of moles of ethylene oxide added in the polyoxyethylene hydrogenated castor oil of component (B) is preferably 30 or more, more preferably 35 or more, and even more preferably 40 or more, from the viewpoints of improving foam quality, foamability at low temperatures, and feel after application. Furthermore, the average number of moles of ethylene oxide added is preferably 80 or less, more preferably 75 or less, and even more preferably 70 or less, from the viewpoints of improving foamability at low temperatures and feel after application. Specifically, it is preferably 30 or more and 80 or less, more preferably 35 or more and 75 or less, and even more preferably 40 or more and 70 or less.

[0024] Specific examples of the polyoxyethylene hydrogenated castor oil of component (B) include polyoxyethylene (30 E.O.) hydrogenated castor oil, polyoxyethylene (40 E.O.) hydrogenated castor oil, polyoxyethylene (50 E.O.) hydrogenated castor oil, polyoxyethylene (60 E.O.) hydrogenated castor oil, and polyoxyethylene (80 E.O.) hydrogenated castor oil. The polyoxyethylene hydrogenated castor oil of component (B) may be used alone or in combination of two or more.

[0025] The polyoxyethylene hydrogenated castor oil of component (B) may be a commercially available product or one synthesized by a conventional method. Polyoxyethylene hydrogenated castor oil is obtained by adding ethylene oxide to hydrogenated castor oil. Commercially available products include NIKKOL HCO-30, NIKKOL HCO-40, NIKKOL HCO-50, NIKKOL HCO-60, NIKKOL HCO-70, and NIKKOL HCO-80 (all manufactured by Nikko Chemicals Co., Ltd.), EMANON CH-40, and EMANON CH-60(K) (all manufactured by Kao Corporation).

[0026] The content of component (B) in the composition of the present invention is preferably 0.05% by mass or more, more preferably 0.07% by mass or more, and even more preferably 0.1% by mass or more from the viewpoints of improving foam quality, foaming ability at low temperatures, and feel after application, and is preferably 0.6% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0.45% by mass or less from the viewpoints of accelerating the disappearance of foam after application and improving feel after application. The specific range is preferably 0.05% by mass or more and 0.6% by mass or less, more preferably 0.07% by mass or more and 0.5% by mass or less, and even more preferably 0.1% by mass or more and 0.45% by mass or less.

[0027] Component (C) used in the present invention is a polyoxyalkylene alkyl ether having an average number of alkylene oxide moles added of at least 10. When used in combination with component (B), this component (C) has the function of improving foam quality, foaming ability at low temperatures, and feel after application. The average number of moles of alkylene oxide added is preferably 10 or more, more preferably 12 or more, even more preferably 15 or more, and is preferably 50 or less, from the viewpoint of improving foam quality and foamability at low temperatures. Examples of polyoxyalkylene include polyoxyethylene and polyoxypropylene, with polyoxyethylene being preferred due to its availability. Examples of the alkyl group of the alkyl ether include alkyl or alkenyl groups having 8 to 20 carbon atoms.

[0028] Specific examples of the polyoxyalkylene alkyl ether (C) include polyoxyethylene lauryl ether, polyoxyethylene myristyl ether, polyoxyethylene palmityl ether, polyoxyethylene isostearyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene hexyldecyl ether, polyoxyethylene octyldodecyl ether, and polyoxyethylene behenyl ether. Suitable commercially available products include polyoxyethylene (21) lauryl ether (Emulgen 121-G, manufactured by Kao Corporation), polyoxyethylene (20) 2-hexyldecyl ether (Emulgen 1620G, manufactured by Kao Corporation), polyoxyethylene (16) lauryl ether (Emulgen 116, manufactured by Kao Corporation), and polyoxyethylene (20) octyldodecyl ether (Emulgen 2020G, manufactured by Kao Corporation). One or more types of component (C) can be used.

[0029] The content of component (C) in the composition of the present invention is preferably 0.02% by mass or more, more preferably 0.03% by mass or more, and even more preferably 0.05% by mass or more from the viewpoints of improving foam quality, foaming ability at low temperatures, and feel after application, and is preferably 0.5% by mass or less, more preferably 0.45% by mass or less, and even more preferably 0.4% by mass or less from the viewpoints of accelerating the disappearance of foam after application and improving feel after application. The specific range is preferably 0.02% by mass or more and 0.5% by mass or less, more preferably 0.03% by mass or more and 0.45% by mass or less, and even more preferably 0.05% by mass or more and 0.4% by mass or less.

[0030] As mentioned above, when used in combination, components (B) and (C) have the function of improving foam quality, foaming ability at low temperatures, and feel after application, but from the viewpoint of accelerating the disappearance of foam after application and improving the feel after application, their total content ((B) + (C)) in the composition of the present invention is preferably less than 0.8% by mass, more preferably 0.7% by mass or less, and even more preferably 0.6% by mass or less. The lower limit of the total content of components (B) and (C) is preferably 0.07% by mass or more. Furthermore, the ratio of the total content of components (B) and (C) to the content of component (A) ((B) + (C) / (A)) is preferably less than 8.0, more preferably 7.0 or less, and even more preferably 6.0 or less, from the viewpoint of accelerating the disappearance of bubbles after application and improving the feel after application. Moreover, the content ratio ((B) + (C) / (A)) is preferably 0.4 or more, and even more preferably 0.5 or more. The ratio of the contents of component (B) to component (C) ((B) / (C)) is preferably 0.1 or more, more preferably 0.2 or more, and even more preferably 0.25 or more, from the viewpoint of accelerating the disappearance of bubbles after application and improving the feel after application, and for the same reasons is preferably 10.0 or less, more preferably 9.0 or less. A specific range is preferably 0.1 or more and 10.0 or less, more preferably 0.2 or more and 9.0 or less, and even more preferably 0.25 or more and 9.0 or less.

[0031] The component (D) used in the present invention is water. As described above, the cosmetic composition of the present invention is a leave-on cosmetic composition that is filled into a foam-dispensing container and dispensed as a foam, and therefore requires water as a medium. The type of water is not particularly limited as long as it is one that is commonly used in cosmetics, such as purified water, ion-exchanged water, or distilled water. The water content varies depending on the form of the cosmetic, but is preferably 50.0% by mass or more, more preferably 60.0% by mass or more, and even more preferably 70.0% by mass or more in the cosmetic of the present invention from the viewpoints of foam quality, foaming ability at low temperatures, foam disappearance rate after application, feel after application, etc. Also, from the same viewpoints, the water content is preferably 99.5% by mass or less, more preferably 99.0% by mass or less.

[0032] The cosmetic composition of the present invention preferably further contains one or more components (E) selected from the group consisting of betaine-type low molecular weight compounds (E1) and polyvalent colates (E2), in order to provide a moist feeling and reduce stickiness when the cosmetic composition of the present invention is applied to the skin, etc. Here, examples of the betaine-type low molecular weight compound (E1) include those represented by the following formula (3), as well as monoethanol-C5-carboxybetaine, etc. Among these, the betaine-type low molecular weight compound represented by formula (3) is preferred from the viewpoints of moist feeling after application, non-stickiness after application, etc.

[0033] [ka]

[0034] (In formula (3), R 21 ~R 23 each independently represents a linear or branched alkyl group having 1 to 6 carbon atoms or a linear or branched hydroxyalkyl group having 1 to 6 carbon atoms; R 24 indicates an amino acid side chain.)

[0035] R 21 ~R 23 The number of carbon atoms in the alkyl group represented by the formula is preferably 1 to 3. Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group. Also, R 21 ~ 23 The number of carbon atoms in the hydroxyalkyl group represented by the formula (I) is preferably 1 to 3. Examples of the hydroxyalkyl group include a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, and a hydroxyisopropyl group. The substitution position of the hydroxy group in the hydroxyalkyl group is optional. Such an R 21 ~R 23 Among these, from the viewpoint of moist feeling after application, a linear or branched alkyl group having 1 to 6 carbon atoms is preferred, and a methyl group is more preferred.

[0036] R 24 Examples of the amino acid side chain represented by the formula (I) include a glycine side chain (hydrogen atom), an alanine side chain (methyl group), and a serine side chain (hydroxymethyl group). From the viewpoint of moisturizing feeling after application, a glycine side chain (hydrogen atom) and a serine side chain (hydroxymethyl group) are preferred, and a glycine side chain (hydrogen atom) is more preferred.

[0037] Specific examples of suitable betaine-type low-molecular-weight compounds include trimethylglycine, 3-hydroxy-2-(trimethylaminio)propanoic acid ion, and dimethyl(2-hydroxyethyl)aminioacetate. These may be used alone or in combination of two or more. Among these, trimethylglycine is particularly preferred from the viewpoint of moisturizing feeling after application. The betaine-type low molecular weight compound may be a commercially available product or one synthesized according to a conventional method, such as Aminocoat (manufactured by Asahi Kasei Finechem Corporation).

[0038] The (E2) polyhydric alcohol is a dihydric or higher alcohol, and from the viewpoint of moist feeling after application, non-stickiness after application, etc., it is preferably one that is liquid at 25°C, and is preferably a dihydric to octahydric alcohol, more preferably a dihydric to hexahydric alcohol, even more preferably a dihydric to tetrahydric alcohol, and even more preferably a glycol or glycerin. Examples of glycols include alkylene glycols such as ethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,2-pentanediol, isoprene glycol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol; and polyalkylene glycols that are liquid at 25°C, such as diethylene glycol, triethylene glycol, polyethylene glycols that are liquid at 25°C (for example, PEG200, PEG300, PEG400, PEG600, etc. listed in the Standards for Cosmetic Ingredients), dipropylene glycol, tripropylene glycol, polypropylene glycols that are liquid at 25°C, and polyoxyethylene polyoxypropylene glycols that are liquid at 25°C (for example, polyoxyethylene (12E.O.) polyoxypropylene (35P.O.) glycol, etc.). The average number of moles of ethylene oxide added in polyoxyethylene polyoxypropylene glycol that is liquid at 25°C is preferably 5 to 10, and the average number of moles of propylene oxide added in polyoxyethylene polyoxypropylene glycol that is liquid at 25°C is preferably 30 to 35. The number average molecular weight of the polyalkylene glycol that is liquid at 25°C is preferably 200 to 800, and more preferably 300 to 600. The number average molecular weight of polyalkylene glycol is a number average molecular weight calculated in terms of polystyrene, and can be measured, for example, as follows.

[0039] (Measurement equipment and conditions) Polystyrene: Tosoh Corporation, TSK standard polystyrene Apparatus: HLC-8220GPC (Tosoh Corporation, integrated GPC apparatus) Detector: RI (differential refractometer) Columns: TSK-gel G5000HxL (7.8 x 300 mm) x 1, G4000HxL (7.8 x 300 mm) x 1, G3000HxL (7.8 x 300 mm) x 1, G2000HxL (7.8 x 300 mm) x 1 Mobile phase: THF (tetrahydrofuran) Flow rate: 1.0mL / min Set temperature: 40℃ Injection volume: 100 μL (sample concentration: 0.4%)

[0040] Examples of glycerins include glycerin (including concentrated glycerin), diglycerin, triglycerin, polyglycerin, etc. Polyglycerin having a 4 to 14 degree polymer is preferred. Among these polyhydric alcohols, dipropylene glycol and 1,3-butylene glycol are preferred from the viewpoint of moist feeling after application, less stickiness, etc. Furthermore, dipropylene glycol is more preferred from the viewpoint of low-temperature dischargeability. The polyhydric alcohol (E2) may be used alone or in combination of two or more.

[0041] The polyhydric alcohol may be a commercially available product or one synthesized according to a conventional method. Commercially available polyalkylene glycols that are liquid at 25°C include PEG-400 (manufactured by Sanyo Chemical Industries, Ltd.) and Pronon #202B (manufactured by NOF Corporation). Commercially available glycerins include Diglycerin 801 (manufactured by Sakamoto Orient Chemicals Corporation). Commercially available dipropylene glycols include Dipropylene Glycol (manufactured by ADEKA Corporation). Commercially available 1,3-butylene glycols include 1,3-butylene glycol (manufactured by Daicel Corporation).

[0042] From the viewpoint of moisturizing feeling after application, the content of component (E) in the cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more. Furthermore, from the viewpoint of the absence of a squeaky feeling upon application, compatibility with the skin upon application, and absence of stickiness after application, the content of component (E) in the cosmetic of the present invention is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, even more preferably 7.5% by mass or less, and particularly preferably 5.0% by mass or less. Specifically, the content in the cosmetic of the present invention is preferably 0.1% by mass or more and 15.0% by mass or less, more preferably 0.1% by mass or more and 10.0% by mass or less, more preferably 0.5% by mass or more and 7.5% by mass or less, and particularly preferably 1% by mass or more and 5.0% by mass or less.

[0043] From the viewpoint of moisturizing feeling after application, the content of the betaine-type low-molecular-weight compound (E1) in the cosmetic of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. From the viewpoint of non-stickiness after application, the content of the betaine-type low-molecular-weight compound in the cosmetic of the present invention is preferably 10.0% by mass or less, more preferably 7.5% by mass or less, and even more preferably 5.0% by mass or less. The specific range is preferably 0.05% by mass or more and 10.0% by mass or less, more preferably 0.1% by mass or more and 7.5% by mass or less, and even more preferably 0.5% by mass or more and 5.0% by mass or less. From the viewpoint of moisturizing feeling after application, the content of (E2) polyhydric alcohol in the cosmetic of the present invention is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more. Furthermore, from the viewpoint of compatibility with the skin upon application and non-stickiness after application, the content of (E2) polyhydric alcohol in the cosmetic of the present invention is preferably 5.0% by mass or less, more preferably 2.5% by mass or less, and even more preferably 1.5% by mass or less. The specific range is preferably 0.01% by mass or more and 5.0% by mass or less, more preferably 0.05% by mass or more and 2.5% by mass or less, and even more preferably 0.1% by mass or more and 1.5% by mass or less.

[0044] In addition to the above-mentioned components, the cosmetic of the present invention may further contain one or more selected from moisturizers, oily components, powders, UV protection agents, antiperspirants, cooling agents, preservatives, disinfectants, antioxidants, fragrances, chelating agents, pH adjusters, and the like.

[0045] As described above, the cosmetic of the present invention is a leave-on cosmetic that is filled into a foam-dispensing container and dispensed as a foam. The liquid content is preferably in the form of a water-based form such as a lotion, serum, emulsion, cream, or sunscreen, and more preferably in the form of a liquid such as a lotion, serum, or emulsion. From the viewpoint of ensuring good foam formation and dischargeability, the viscosity at 25°C is preferably 50 mPa·s or less, more preferably 30 mPa·s or less, and even more preferably 20 mPa·s or less. In the present invention, the viscosity is measured at 25°C using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd.) with rotor No. 1 rotating at a rotation speed of 60 r / min, 60 seconds after the start of rotation. The pH of the cosmetic preparation (content liquid) of the present invention at 25°C is preferably 6.3 to 9.0, more preferably 6.5 to 8.5, and even more preferably 7.0 to 8.0, from the viewpoints of improving foaming properties at low temperatures and preventing irritation to the skin. These pH values ​​can be adjusted using a known pH buffer (pH adjuster).

[0046] Specific forms of foam-dispensing containers may include a mechanism that discharges air and cosmetic composition from an air-liquid mixing section, optionally via a tube, nozzle, or other component, and then preferably passes through a foam-refining section, and then discharges the contents from a discharge outlet to the outside. Examples of such containers include squeeze-type containers, manual pump-type containers, and electric pump-type containers.

[0047] A squeeze-type container, also called a squeeze container, is a container in which a manual pressure is applied from the outside to a body portion located in a deformable container body, i.e., the body portion is squeezed and deformed, so that air pumped from the head space and the liquid content are mixed in a gas-liquid mixing section to form foam, and then the foam is atomized in a foam atomizing section, and the foam is discharged from a discharge port. Specific examples include the container described in JP-A-7-215353.

[0048] A pump-type container, also known as a pump container, is a foam dispenser having a discharge port. By pressing a pump head, air pumped from inside or outside the container and the liquid contents are mixed in a gas-liquid mixing section to form foam, the foam is atomized in a foam atomizing section, and the foam is discharged from the discharge port. Specifically, such pump-type containers include an air cylinder for introducing air from inside or outside the container and a liquid cylinder that serves as a flow path for the liquid contents, each with a piston sliding mechanism inside. Pressing the pump head drives these pistons, sending the air and liquid contents to the gas-liquid mixing section, where they are mixed, then forming foam in the foam atomizing section, and the foam is discharged from the discharge port. Containers can be broadly divided into so-called manual pump-type containers, in which the pump head is pressed manually, and so-called electric pump-type containers, in which the pump head is pressed manually and the air and contents are transported between components electrically. Either type can be used. Specific examples include the manual pump type container described in JP 2009-202122 A and the electric pump type containers described in JP 2006-212086 A and JP 2013-212244 A.

[0049] The foam leave-on cosmetic of the present invention is preferably used by applying the foam discharged from a foam-dispensing container to the skin, hair, etc., using the fingers or directly, and then spreading the applied foam over the skin, etc. as needed. The application area may include the hands, arms, upper body, feet, legs, lower body, head (including hair), and whole body. It is particularly preferable to apply the cosmetic to a wide area, such as the whole body, upper body, or lower body. [Example]

[0050] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0051] Examples 1 to 17 and Comparative Examples 1 to 7 The components shown in Tables 1 to 3 were mixed to prepare a liquid content of the cosmetic of the present invention, which was then filled into a pump former container to produce a foamy leave-on cosmetic. Approximately 1g of the cosmetic was dispensed onto clean hands from a container stored at room temperature (25°C), and the foaming ability, foam quality (fineness of the foam), lack of stickiness after application to cleansed facial skin, and the speed at which the foam disappeared after application to cleansed facial skin were evaluated. Additionally, the foaming ability was evaluated when approximately 1g of the cosmetic was dispensed onto clean hands from a container stored at 5°C. The results are shown in Tables 1 to 3.

[0052] (1) Foaming ability at room temperature (25°C) (method) Ten expert panelists ejected 1.0 g of the cosmetic onto clean hands from a container stored at room temperature (25°C), and evaluated the "foaming ability" according to the following criteria. The results are shown as the average score of the 10 panelists. A: Average score ≥ 4.5 B: 4.5 > average score ≥ 3.5 C: 3.5 > average score ≥ 2.5 D: 2.5 > average score ≥ 1.5 E: 1.5> Average score (Evaluation criteria) 5 points: Very good 4 points: good 3 points: Fairly good 2 points: Neither 1 point: Bad 0 points: Very bad

[0053] (2) Foam quality (fineness of foam) at room temperature (25°C) (method) Ten expert panelists ejected 1.0 g of the cosmetic onto clean hands from a container stored at room temperature (25°C), and evaluated the "foam quality" according to the following criteria. The results are shown as the average score of the 10 panelists. A: Average score ≥ 4.5 B: 4.5 > average score ≥ 3.5 C: 3.5 > average score ≥ 2.5 D: 2.5 > average score ≥ 1.5 E: 1.5> Average score (Evaluation criteria) 5 points: Very good 4 points: good 3 points: Fairly good 2 points: Neither 1 point: Bad 0 points: Very bad

[0054] (3) Foaming ability at low temperatures (5°C) (method) Ten expert panelists ejected 1.0 g of the cosmetic onto their clean hands from a container stored at room temperature (5°C), and evaluated the "foaming ability" according to the following criteria. The results are shown as the average score of the 10 panelists. A: Average score ≥ 4.5 B: 4.5 > average score ≥ 3.5 C: 3.5 > average score ≥ 2.5 D: 2.5 > average score ≥ 1.5 E: 1.5> Average score (Evaluation criteria) 5 points: Very good 4 points: good 3 points: Fairly good 2 points: Neither 1 point: Bad 0 points: Very bad

[0055] (4) No slippery feeling after application (method) Ten expert panelists dispensed 1.0 g of cosmetic product onto clean hands from a container stored at room temperature (25°C), and applied it to cleansed facial skin. The panel evaluated the stickiness of the product according to the following criteria. The results are shown as the average score of the 10 panelists. A: Average score ≥ 4.5 B: 4.5 > average score ≥ 3.5 C: 3.5 > average score ≥ 2.5 D: 2.5 > average score ≥ 1.5 E: 1.5> Average score (Evaluation criteria) 5 points: Very few 4 points: Few 3 points: Somewhat low 2 points: Neither 1 point: Yes 0 points: Very

[0056] (5) The rate at which bubbles disappear after application (method) Ten expert panelists dispensed 1.0 g of cosmetic product onto clean hands from a container stored at room temperature (25°C), and applied it to cleansed facial skin. The speed at which the foam disappeared after application was evaluated according to the following criteria. The results are shown as the average score of the 10 panelists. A: Average score ≥ 4.5 B: 4.5 > average score ≥ 3.5 C: 3.5 > average score ≥ 2.5 D: 2.5 > average score ≥ 1.5 E: 1.5> Average score (Evaluation criteria) 5 points: Very fast 4 points: Fast 3 points: Slightly fast 2 points: Neither 1 point: slow 0 points: Very slow

[0057] [Table 1]

[0058] [Table 2]

[0059]

Table 3

Claims

1. A foamy leave-on cosmetic preparation comprising the following components (A) to (D), wherein the total content of components (B) and (C) is less than 0.8% by mass: (A) sodium dilauramidoglutamide lysine 0.02% by mass or more and 0.7% by mass or less, (B) 0.05% by mass or more and 0.6% by mass or less of polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide added of 30 or more moles, (C) 0.02% by mass or more and 0.6% by mass or less of a polyoxyalkylene alkyl ether having an average addition mole number of alkylene oxide of 10 or more, (D) Water

2. 2. The foamy leave-on cosmetic according to claim 1, wherein the ratio of the total content of components (B) and (C) to the content of component (A) ((B) + (C) / (A)) is less than 8.

0.

3. 2. The foam leave-on cosmetic according to claim 1, having a pH at 25°C of 6.3 or more and 9.0 or less.

4. 2. The foamy leave-on cosmetic according to claim 1, further comprising 0.1% by mass to 15.0% by mass of component (E) one or more selected from betaine-type low molecular weight compounds and polyhydric alcohols.

5. The foam leave-on cosmetic according to any one of claims 1 to 4, which is a foam leave-on cosmetic filled in a foam-dispensing container and dispensed as foam.

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