Cleansing composition

Abstract

Provided is a cleansing composition including: a hydrocarbon oil having a molecular weight of 400 or less; an amphiphilic liquid oil having a plurality of ether groups in the molecule; a water-soluble acrylic polymer having a structural unit derived from a (meth)acrylic acid in the molecule; an oil gelling agent having a crosslinked polymer molecular structure; and at least one of alkali metal ions and magnesium ions.

Description

Cleansing composition CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Japanese Patent Application No. 2023-143824, which is incorporated herein by reference.

[0002] The present invention relates to a cleansing composition.

[0003] BACKGROUND ART Cleansing compositions used to remove cosmetics and the like attached to the skin or hair have been known.

[0004] Known examples of this type of cleansing composition include a cleansing composition containing at least an oil and a water-soluble acrylic copolymer (Patent Document 1).

[0005] In detail, the cleansing composition described in Patent Document 1 contains 50 to 91% by mass of a polyhydric alcohol containing glycerin, 0.25 to 4% by mass of polyglyceryl-10 (behenate / eicosanedioate), 1 to 23% by mass of a nonionic surfactant having an HLB of 5 to 17, 5 to 38% by mass of one or more selected from oily waxes and / or liquid oils, 0.001 to 0.36% by mass of one or more selected from a specific water-soluble acrylic copolymer, an organic acid, and a salt of said organic acid, and 10% by mass or less of water.

[0006] The cleansing composition described in Patent Document 1 can remove used makeup cosmetics and the like that have adhered to the skin and the like.

[0007] Japanese Patent Application Publication No. 2018-070470

[0008] However, cleansing compositions that can sufficiently remove cosmetics after use have not yet been fully investigated.

[0009] Therefore, an object of the present invention is to provide a cleansing composition that can sufficiently remove cosmetics attached to the skin or hair.

[0010] The cleansing composition according to the present invention comprises a hydrocarbon oil having a molecular weight of 400 or less, an amphiphilic liquid oil having a plurality of ether groups in the molecule, a water-soluble acrylic polymer having a structural unit derived from (meth)acrylic acid in the molecule, an oil gelling agent having a crosslinked polymer molecular structure, and at least one of an alkali metal ion and a magnesium ion.

[0011] 1 is a graph showing the cleansing performance (relative values) of cleansing compositions.

[0012] An embodiment of the cleansing composition according to the present invention will be described below.

[0013] The cleansing composition of this embodiment comprises: (A) a hydrocarbon oil having a molecular weight of 400 or less; (B) an amphiphilic liquid oil having multiple ether groups in its molecule; (C) a water-soluble acrylic polymer having structural units derived from (meth)acrylic acid in its molecule; (D) an oil gelling agent having a crosslinked polymer molecular structure; and (E) at least one of an alkali metal ion or a magnesium ion. The cleansing composition of this embodiment has good cleansing performance. In other words, the cleansing composition of this embodiment can sufficiently remove cosmetics attached to skin or hair.

[0014] The cleansing composition of this embodiment preferably further contains water, a surfactant (F), and an oily component (G) other than the above (A) and (B). The cleansing composition of this embodiment is, for example, an emulsion-type preparation in which an oily component is dispersed in an aqueous component.

[0015] The cleansing composition of this embodiment can be used, for example, to remove makeup cosmetics applied to the skin, eyebrows, or eyelashes, or hair styling products applied to the hair. Examples of makeup cosmetics to be removed include foundation applied to the skin, lipstick applied to the lips, eyeshadow or eyeliner applied to the eyelids, eyebrow makeup applied to the eyebrows, or mascara applied to the eyelashes. Examples of hair styling products to be removed include styling agents, hair oils, hair gels, or hair spray styling products applied to the hair. The term "cleansing composition" refers to a composition for removing used cosmetics (makeup stains) that have adhered to the skin, hair, or the like.

[0016] <(A) Hydrocarbon Oil with Molecular Weight of 400 or Less> The hydrocarbon oil (A) is a hydrocarbon compound having only carbon [C] and hydrogen [H] in the molecule. The hydrocarbon oil (A) is usually liquid at 20°C. The hydrocarbon oil (A) may contain a linear hydrocarbon, a branched hydrocarbon, or a cyclic hydrocarbon. The hydrocarbon oil (A) may be a mixture of hydrocarbon compounds having different numbers of carbon atoms. The hydrocarbon oil (A) is preferably a saturated hydrocarbon compound, but may also contain an unsaturated hydrocarbon compound.

[0017] Examples of the hydrocarbon oil (A) include octane (molecular weight: about 114), nonane (molecular weight: about 128), decane (molecular weight: about 142), undecane (molecular weight: about 156), dodecane (molecular weight: about 170), tridecane (molecular weight: about 184), tetradecane (molecular weight: about 198), pentadecane (molecular weight: about 212), hexadecane (molecular weight: about 226), heptadecane (molecular weight: about 240), octadecane (molecular weight: about 254), and nonadecane (molecular weight: about 268). These hydrocarbon compounds may be linear or branched, as described above. That is, for example, the octane may be normal octane (n-octane) or isooctane (iso-octane). The same applies to the hydrocarbon oils other than octane. Examples of the hydrocarbon oil (A) include pristane (molecular weight of about 268), hydrogenated farnesene, mineral oil (liquid paraffin) having a molecular weight of 400 or less, hydrogenated polyisobutene (hydrogenated polyisobutene) having a molecular weight of 400 or less, and hydrogenated polydecene (hydrogenated polydecene) having a molecular weight of 400 or less. The molecular weight of the hydrocarbon oil (A) is measured by a common analytical method such as mass spectrometry, nuclear magnetic resonance spectroscopy, or X-ray crystallography.

[0018] The molecular weight of the hydrocarbon oil (A) is preferably 300 or less, and more preferably 250 or less. A smaller molecular weight of the hydrocarbon oil (A) has the advantage of being able to more fully remove stains from makeup cosmetics and the like. The molecular weight of the hydrocarbon oil (A) may be 100 or more.

[0019] <(B) Amphiphilic Liquid Oil Having Multiple Ether Groups in the Molecule> The amphiphilic liquid oil (B) is liquid at 20°C. The amphiphilic liquid oil (B) may further have one ester group or multiple ester groups in the molecule. Note that the ether group does not include a siloxane bond (Si—O—Si).

[0020] Examples of the amphiphilic liquid oil (B) include an addition polymer of an alkylene oxide, an addition polymer of a mixture of an alkylene oxide and a polyol, or a dehydration condensate (esterification reaction product) of a carboxylic acid compound and a monool.

[0021] Among the amphipathic liquid oils (B), examples of the alkylene oxide addition polymers include triethylene glycol, tetraethylene glycol, polyethylene glycol, tripropylene glycol, tetrapropylene glycol, polypropylene glycol, tributylene glycol, and tetrabutylene glycol.

[0022] Among the amphipathic liquid oils (B), examples of the addition polymer of a mixture of an alkylene oxide and a polyol include an addition polymer of a mixture of at least one alkylene oxide selected from ethylene oxide, propylene oxide, and butylene oxide with at least one polyol selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, and glycerin, such as polyethylene glycol (PEG) / polypropylene glycol (PPG) / polybutylene glycol-8 / 5 / 3 glycerin.

[0023] Examples of the dehydration condensate (esterification product) of the amphipathic liquid oil (B) include a dehydration condensate (esterification product) of one molecule of a monocarboxylic acid compound having one carboxy group in the molecule with one molecule of a monool containing multiple ether groups in the molecule. Examples of the monocarboxylic acid include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, 2-ethylhexanoic acid, and lactic acid. Examples of the monool include diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, polyethylene glycol monomethyl ether, polyethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, and phenoxyethanol.

[0024] Furthermore, among the amphipathic liquid oils (B), examples of the dehydration condensates (esterification products) include a dehydration condensate (esterification product) of one molecule of a dicarboxylic acid compound having multiple carboxy groups in the molecule with two molecules of a monool containing ether groups in the molecule. Examples of the dicarboxylic acid include succinic acid, malic acid, itaconic acid, isatoic acid, dipicolinic acid, oxalic acid, glutaric acid, malonic acid, N-methyl-D-aspartic acid, oxaloacetic acid, mesaconic acid, A-ketoglutaric acid, adipic acid, sebacic acid, 4-fumarylacetoacetic acid, 2-hydroxy-3-oxosuccinic acid, and cyclohexane-1,4-dicarboxylic acid. Examples of the monool include, in addition to the monools described above, monools such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether.

[0025] The amphiphilic liquid oil (B) is preferably an amphiphilic liquid oil having multiple ester groups and multiple ether groups in the molecule, which has the advantage of being able to more thoroughly remove stains such as makeup cosmetics.

[0026] Specifically, an example of the amphipathic liquid oil (B) is bisethoxydiglycol cyclohexane-1,4-dicarboxylate (an ester-bonded compound between one molecule of cyclohexane-1,4-dicarboxylic acid and two molecules of diethylene glycol monoethyl ether). Another example of the amphipathic liquid oil (B) is bisethoxydiglycol succinate, which is an ester-bonded compound between one molecule of succinic acid and two molecules of diethylene glycol monoethyl ether. The two types of amphipathic liquid oils exemplified above have multiple ester groups and multiple ether groups in the molecule.

[0027] <(C) Water-soluble acrylic polymer having (meth)acrylic acid-derived structural units in the molecule> The water-soluble acrylic polymer (C) is a polymer obtained by polymerizing at least a (meth)acrylic acid-derived monomer (hereinafter also referred to as an acrylic acid-based monomer). Acrylic acid-based monomers include (meth)acrylic acid monomers and (meth)acrylic acid ester monomers. In other words, the water-soluble acrylic polymer (C) is a polymer having at least one of a (meth)acrylic acid structural unit or a (meth)acrylic acid ester structural unit in the molecule. For example, the water-soluble acrylic polymer (C) is a copolymer obtained by polymerizing at least two different (meth)acrylic acid-based monomers, or a copolymer of a (meth)acrylic acid-based monomer and a monomer other than a (meth)acrylic acid-based monomer. The (meth)acrylic acid ester structural unit includes a state in which the carboxy group of the (meth)acrylic acid structural unit is esterified or formed into an amide bond. In this specification, the term "(meth)acrylic acid" refers to at least one of acrylic acid and methacrylic acid.

[0028] The water-soluble acrylic polymer (C) has a water solubility of, for example, at least 0.5 g in 100 g of water (20° C.).

[0029] The water-soluble acrylic polymer has, for example, a plurality of hydrophilic groups in the molecule. Examples of the hydrophilic groups include anionic groups, cationic groups, and nonionic groups. Examples of the anionic groups include carboxy groups (—COOH) and sulfo groups (—SO ３ Examples of the cationic group include an amino group (-NH ２ Examples of the nonionic group include a polyoxyethylene group and a pyrrolidone group.

[0030] The water-soluble acrylic polymer preferably contains an anionic group as the hydrophilic group.

[0031] Examples of the water-soluble acrylic polymer containing an anionic group include a water-soluble acrylic polymer containing a carboxy group and a water-soluble acrylic polymer containing a sulfo group. The water-soluble acrylic polymer containing a carboxy group has, for example, a carboxy group derived from a (meth)acrylic acid monomer or a carboxy group derived from a (meth)acrylate carboxyethyl monomer in the molecule. The water-soluble acrylic polymer containing a sulfo group has, for example, a sulfo group derived from a (meth)acryloyldimethyltaurine monomer in the molecule.

[0032] The water-soluble acrylic polymer containing a carboxy group may be a homopolymer or a copolymer.

[0033] The homopolymer may be a homopolymer of (meth)acrylic acid, a homopolymer of a (meth)acrylic acid ester monomer having a carboxy group, or a homopolymer of a (meth)acrylic acid ester monomer having a sulfo group. Examples of the homopolymer include poly(meth)acrylic acid (which may be in the form of a salt such as a sodium salt), polycarboxyethyl(meth)acrylate (which may be in the form of a salt such as a potassium salt), or polyacryloyldimethyltaurine (which may be in the form of a salt such as an ammonium salt).

[0034] The copolymer may be a copolymer of (meth)acrylic acid and another monomer, a copolymer of a (meth)acrylic acid ester monomer having a carboxy group and another monomer, or a copolymer of a (meth)acrylic acid ester monomer having a sulfo group and another monomer. Specific examples of the copolymer include carboxyvinyl polymer (carbomer), acrylates / C10-30 alkyl acrylate crosspolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, and ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer. The acrylates / C10-30 alkyl acrylate crosspolymer is a copolymer of at least (meth)acrylic acid and an alkyl acrylate ester (having a hydrocarbon moiety with 10 to 30 carbon atoms) crosslinked with a sucrose allyl ether or a pentaerythritol allyl ether.

[0035] The copolymer preferably has a higher emulsifying ability. The higher emulsifying ability of the copolymer can improve the stability of the cleansing composition over time. For example, acrylates / C10-30 alkyl acrylate crosspolymer or ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer has a higher emulsifying ability than carboxyvinyl polymer (carbomer). Therefore, in terms of improving the stability of the cleansing composition over time, the copolymer is preferably an acrylates / C10-30 alkyl acrylate crosspolymer or ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer.

[0036] Commercially available raw materials can be used as the water-soluble acrylic polymer (C). Specifically, for example, a carboxyvinyl polymer such as "Carbopol 940" (manufactured by Lubrizol) can be used. Furthermore, an acrylates / C10-30 alkyl acrylate crosspolymer such as "PEMULEN TR-1" (manufactured by Lubrizol) can be used. Furthermore, polyacrylic acid such as "Polyacrylic Acid 25,000," "Polyacrylic Acid 250,000," or "Polyacrylic Acid 1,000,000" (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) can be used. Furthermore, a raw material containing a (sodium acrylate / sodium acryloyldimethyltaurate) copolymer such as "Simulgel EG QD" (manufactured by SEPPIC S.A.) can be used. Furthermore, a raw material containing a (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer may be used, such as a product called "Simulgel FL" (manufactured by SEPPIC S.A.). Furthermore, a raw material containing an ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer may be used, such as a product called "Aristoflex AVC" (manufactured by Clariant Japan).

[0037] <(D) Oil Gelling Agent Having Crosslinked Polymer Molecular Structure> The oil gelling agent having a crosslinked polymer molecular structure includes a crosslinked polymer compound. Examples of the crosslinked polymer compound include crosslinked methylpolysiloxanes having an organopolysiloxane structure in the molecule.

[0038] Examples of the crosslinked methylpolysiloxane include (dimethicone / vinyldimethicone) crosspolymer, (dimethicone / phenylvinyldimethicone) crosspolymer, (vinyldimethicone / lauryldimethicone) crosspolymer, and (laurylpolydimethylsiloxyethyldimethicone / bisvinyldimethicone) crosspolymer.

[0039] The oil gelling agent may be in a dissolved state or in a dispersed state without being dissolved in the cleansing composition of this embodiment. The dispersed oil gelling agent can increase the viscosity of the oily component by dispersing in the oily component in the form of particles. Furthermore, the dissolved oil gelling agent can increase the viscosity of the oily component by dissolving in the oily component and forming a micro-network structure.

[0040] The dispersed oil gelling agent is, for example, spherical (including spherical and oval) or plate-like. The average particle size of the dispersed oil gelling agent may be 1 μm or more, or 5 μm or more. Furthermore, such an average particle size may be 50 μm or less, or 40 μm or less. Note that the dispersed oil gelling agent particles may be present, for example, inside the emulsified oil component or near the interface between the oil component and the aqueous component.

[0041] On the other hand, the oil gelling agent in a dissolved state exists, for example, inside the emulsified oily component, and spreads crosslinked molecular chains in a network-like pattern within the oily component.

[0042] For example, the above-mentioned (dimethicone / vinyl dimethicone) crosspolymer is a polymeric compound having a molecular structure in which a portion of the side chains of linear dimethicone (dimethylpolysiloxane) are crosslinked with divinyl dimethicone (polydimethylsiloxane with vinyl at both ends). Commercially available products can be used as the (dimethicone / vinyl dimethicone) crosspolymer. An example of a commercially available (dimethicone / vinyl dimethicone) crosspolymer that is dispersed in the cleansing composition of this embodiment is "KSG-16" (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0043] The (vinyl dimethicone / lauryl dimethicone) crosspolymer is a polymeric compound having a molecular structure in which lauryl dimethicone is crosslinked with divinyl dimethicone. Commercially available products can be used as the (dimethicone / vinyl dimethicone) crosspolymer. An example of a commercially available (vinyl dimethicone / lauryl dimethicone) crosspolymer that is dispersed in the cleansing composition of this embodiment is the product name "KSG-42A" (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0044] When the cleansing composition contains liquid silicone (described later), the oil gelling agent preferably has a higher affinity with the liquid silicone (described later).Higher affinity with the liquid silicone (described later) can improve the stability of the cleansing composition over time.For example, (dimethicone / vinyl dimethicone) crosspolymer has a higher affinity with the liquid silicone (described later) than (vinyl dimethicone / lauryl dimethicone) crosspolymer.Therefore, (dimethicone / vinyl dimethicone) crosspolymer is preferred as the oil gelling agent, in that it can improve the stability of the cleansing composition over time containing liquid silicone.

[0045] On the other hand, examples of commercially available (dimethicone / vinyl dimethicone) crosspolymers that are dissolved in the cleansing composition of the present embodiment include those under the product name "DOWSIL 3901L" (manufactured by The Dow Chemical Company).

[0046] <(E) Alkali Metal Ion, Magnesium Ion> Of the above alkali metal ions and magnesium ions (E), sodium ions or potassium ions are preferred. The alkali metal ions (E) may be alkali metal ions derived from hydroxides (sodium hydroxide, potassium hydroxide, etc.), or may be alkali metal ions derived from inorganic salts (sodium chloride, sodium sulfate, sodium nitrate, sodium phosphate, etc., as well as potassium), or may be alkali metal ions derived from organic acid salts (sodium citrate, sodium acetate, sodium lactate, etc., as well as potassium). Examples of the magnesium ions include magnesium ions derived from magnesium sulfate.

[0047] The cleansing composition of this embodiment preferably further contains an organic acid capable of pairing with the alkali metal ions to form a salt. Such an organic acid is incorporated into the cleansing composition, for example, by being blended as a raw material in the form of an organic acid salt of the alkali metal. Alternatively, the cleansing composition may contain alkali metal ions and an organic acid by blending, for example, sodium hydroxide or potassium hydroxide with an organic acid. By incorporating an organic acid and an alkali metal ion, the cleansing composition of this embodiment can have a pH buffering effect, thereby suppressing pH fluctuations over time in the cleansing composition.

[0048] The organic acid may be acetic acid, citric acid, pyrrolidone carboxylic acid, or lactic acid.As the organic acid, citric acid is preferred, since it can more effectively suppress the pH fluctuation of the cleansing composition over time.In other words, the cleansing composition containing citric acid and alkali metal ions can more effectively suppress the pH fluctuation over time.

[0049] <(F) Surfactant> The surfactant contained in the cleansing composition of this embodiment is a compound having a hydrophilic group and a lipophilic group in the molecule. The surfactant can, for example, disperse the crosslinked silicone particles and amphiphilic liquid oil in an aqueous component containing water. Alternatively, the surfactant can, for example, disperse an aqueous component containing water in an oil component containing the crosslinked silicone particles and amphiphilic liquid oil.

[0050] The surfactant preferably includes a surfactant having a polyoxyalkylene chain in the molecule. The polyoxyalkylene chain is a polyoxyethylene chain, a polyoxypropylene chain, a polyoxy(ethylene / propylene) chain, etc. The polyoxyalkylene chain (particularly the polyoxyethylene chain) functions as a hydrophilic group in the surfactant.

[0051] The lipophilic group of the surfactant is not particularly limited, but examples thereof include an alkyl group having 12 to 22 carbon atoms (saturated fatty acid alkyl group), a polydimethylsiloxane structure, and a structure in which the fatty acid portion of castor oil has been hydrogenated.

[0052] The alkyl group as the lipophilic group may be a saturated alkyl group or an unsaturated alkyl group. The saturated alkyl group may be a linear or branched chain. Examples of the alkyl group as the lipophilic group include a lauryl group, a myristyl group, a palmityl group (cetyl group), a stearyl group, an oleyl group, an isostearyl group, and a behenyl group.

[0053] The surfactants can be classified based on the balance between hydrophilic and lipophilic groups in the molecule. For example, surfactants can be classified based on an index indicating their affinity to aqueous and oily components. One such index is the HLB (Hydrophile-Lipophile Balance) value. In this embodiment, the HLB value is calculated by the Griffin method.

[0054] The surfactant preferably has an HLB value of 4 or more and 17 or less. The surfactant preferably includes a surfactant with an HLB value of less than 10 (hereinafter also referred to as a low HLB surfactant) and a surfactant with an HLB value of 10 or more (hereinafter also referred to as a high HLB surfactant). This can improve the formulation stability of the cleansing composition over time.

[0055] The cleansing composition of this embodiment contains a low HLB surfactant and a high HLB surfactant, and the difference in HLB value between the two is preferably 1 or more, more preferably 3 or more, even more preferably 5 or more, and even more preferably 7 or more. This allows for more sufficient removal of dirt such as makeup cosmetics. The difference in HLB value between the two may be 15 or less, 13 or less, or 11 or less.

[0056] Examples of the surfactant include polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyethylene glycol fatty acid esters, polyether-modified polydimethylsiloxanes, polyoxyethylene glyceryl ether fatty acid esters, and polyoxyethylene hydrogenated castor oil.

[0057] Examples of the polyoxyethylene sorbitan fatty acid ester include polyoxyethylene sorbitan mono-fatty acid ester, polyoxyethylene sorbitan di-fatty acid ester, and polyoxyethylene sorbitan tri-fatty acid ester. The term "fatty acid" refers to a carboxylic acid having 12 to 22 carbon atoms. The fatty acid may be a saturated fatty acid or an unsaturated fatty acid.

[0058] The average number of moles (indicated by E.O.) of alkylene oxide (particularly ethylene oxide) added in the polyoxyethylene sorbitan fatty acid ester may be, for example, 4 E.O. or more and 60 E.O. or less, 40 E.O. or less, 20 E.O. or less, or 10 E.O. or less.

[0059] Examples of the polyoxyethylene sorbitan fatty acid ester include polyoxyethylene sorbitan mono-fatty acid ester, polyoxyethylene sorbitan di-fatty acid ester, polyoxyethylene sorbitan tri-fatty acid ester, etc. Details of the fatty acid moiety of these surfactants and the average number of moles of ethylene oxide added are the same as those of polyoxyethylene sorbitan fatty acid esters, and therefore will not be described again.

[0060] Examples of the polyethylene glycol fatty acid ester include polyethylene glycol mono-fatty acid esters, polyethylene glycol di-fatty acid esters, etc. The average number of moles of ethylene oxide added (indicated by E.O.) of the polyethylene glycol mono-fatty acid esters is, for example, 5 E.O. or more and 15 E.O. or less.

[0061] The polyether-modified polydimethylsiloxanes mentioned above include various compounds with different numbers of moles of ethylene oxide added. The average number of moles of ethylene oxide added is sometimes indicated by the abbreviation E.O., for example, as shown below. Examples of polyether-modified polydimethylsiloxanes include those with an average number of moles of ethylene oxide added of 5 to 15.

[0062] Examples of the polyoxyethylene glyceryl ether fatty acid ester include polyoxyethylene glyceryl ether mono-fatty acid ester, polyoxyethylene glyceryl ether di-fatty acid ester, and polyoxyethylene glyceryl ether tri-fatty acid ester.

[0063] Examples of the polyoxyethylene glyceryl ether fatty acid ester include those having an average number of moles of ethylene oxide added (per glycerin molecule) of 5 or more and 30 or less.

[0064] As the surfactant (such as a surfactant having a polyoxyalkylene chain in the molecule), commercially available products can be used.

[0065] <Oil component (G) other than the above (A) and (B)> Examples of the oil component (G) include liquid silicone, liquid hydrocarbon oil having a molecular weight of more than 400, and liquid ester oil. The oil component (G) preferably contains the above liquid silicone.

[0066] The liquid silicone is a silicone compound that is liquid at 20° C. The liquid silicone may be a volatile silicone such as a cyclic silicone, or may be a non-volatile silicone.

[0067] Examples of volatile silicones include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane (cyclopentasiloxane), and trisiloxane.

[0068] Examples of non-volatile silicones include polydimethylsiloxane (dimethicone), polymethylphenylsiloxane (diphenyldimethicone), phenyltrimethicone, diphenylsiloxyphenyltrimethicone, amino-modified silicone, epoxy-modified silicone, carboxy-modified silicone, polyether-modified silicone, and alkyl-modified silicone.

[0069] The liquid hydrocarbon oil (having a molecular weight of more than 400) is a compound having a linear, branched, or cyclic hydrocarbon structure, and is liquid at 20°C.

[0070] Examples of liquid hydrocarbon oils include mineral oil (molecular weight greater than 400), squalane (molecular weight approximately 422), squalene (molecular weight 411), hydrogenated polyisobutene (hydrogenated polyisobutene) having a molecular weight greater than 400, and hydrogenated polydecene (hydrogenated polydecene) having a molecular weight greater than 400. The cleansing composition of this embodiment may further contain a solid hydrocarbon. Examples of solid hydrocarbons include microcrystalline wax, ozokerite, paraffin, ceresin, and petrolatum.

[0071] The liquid ester oil is an organic compound that is liquid at 20° C. and has at least one ester bond in the molecule and either one ether group or no ether group.

[0072] The liquid ester oil is, for example, an esterification reaction product of an organic acid and a monohydric alcohol or a polyhydric alcohol.

[0073] The organic acid moiety (organic acid residue) of the liquid ester oil may be a saturated organic acid or an unsaturated organic acid. Furthermore, the hydrocarbon of the organic acid moiety (organic acid residue) of the liquid ester oil may be linear or branched. Examples of the organic acid moiety (organic acid residue) of the liquid ester oil include residues of monovalent or divalent organic acids having 6 to 22 carbon atoms. Examples of monovalent organic acids include n-hexanoic acid, iso-hexanoic acid, n-heptanoic acid, iso-heptanoic acid, n-octanoic acid, iso-octanoic acid, n-nonanoic acid, iso-nonanoic acid, n-decanoic acid, iso-decanoic acid, n-undecanoic acid, iso-undecanoic acid, n-dodecanoic acid (lauric acid), iso-dodecanoic acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, and behenic acid. Examples of divalent organic acids (dicarboxylic acids) include propanedioic acid, butanedioic acid, pentanedioic acid, hexanedioic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, decanedioic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanedioic acid, nonadecanedioic acid, and eicosane dioic acid.

[0074] Examples of the monohydric alcohol moiety (monohydric alcohol residue) of the liquid ester oil include ethyl alcohol, aliphatic monool, etc. Examples of the polyhydric alcohol moiety (polyhydric alcohol residue) of the liquid ester oil include ethylene glycol, propylene glycol, glycerin, etc.

[0075] As the liquid ester oil, an esterification reaction product of glycerin with a mixture of a linear and branched saturated organic acid and a divalent organic acid is preferred, as this can provide a better feel to the touch of the cleansing composition.

[0076] The cleansing composition of this embodiment preferably contains 1.0 mass% or more, and more preferably 3.0 mass% or more, of (A) a hydrocarbon oil having a molecular weight of 400 or less. By containing 1.0 mass% or more of (A) the above hydrocarbon oil, dirt from makeup cosmetics and the like can be more thoroughly removed. Furthermore, the cleansing composition of this embodiment preferably contains 10.0 mass% or less, and more preferably 6.0 mass% or less, of (A) a hydrocarbon oil having a molecular weight of 400 or less. By containing 10.0 mass% or less of (A) the above hydrocarbon oil, dirt from makeup cosmetics and the like can be more quickly removed.

[0077] The cleansing composition of this embodiment preferably contains 0.1 mass% or more, more preferably 0.5 mass% or more, and even more preferably 1.0 mass% or more of (B) an amphipathic liquid oil having multiple ether groups in the molecule. By containing 0.1 mass% or more of the amphipathic liquid oil (B), dirt from makeup cosmetics and the like can be more thoroughly removed. Furthermore, the cleansing composition of this embodiment preferably contains 5.0 mass% or less, more preferably 4.0 mass% or less, and even more preferably 3.0 mass% or less of the amphipathic liquid oil (B) having multiple ether groups in the molecule. By containing 5.0 mass% or less of the amphipathic liquid oil (B), dirt from makeup cosmetics and the like can be more quickly removed.

[0078] The cleansing composition of this embodiment preferably contains 0.1% by mass or more, and more preferably 0.5% by mass or more, of the water-soluble acrylic polymer (C). By containing 0.1% by mass or more of the water-soluble acrylic polymer (C), the stability of the cleansing composition over time becomes better. Furthermore, the cleansing composition of this embodiment preferably contains 2.0% by mass or less, and more preferably 1.0% by mass or less, of the water-soluble acrylic polymer (C). By containing 2.0% by mass or less of the water-soluble acrylic polymer (C), the fluidity of the cleansing composition becomes better.

[0079] The cleansing composition of this embodiment preferably contains 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more of (D) an oil gelling agent having a crosslinked polymer molecular structure. By containing 0.05% by mass or more of (D) an oil gelling agent having a crosslinked polymer molecular structure, dirt such as makeup cosmetics can be more thoroughly removed, and the stability of the cleansing composition over time becomes better. Furthermore, the cleansing composition of this embodiment preferably contains 2.0% by mass or less of (D) an oil gelling agent having a crosslinked polymer molecular structure, more preferably 1.0% by mass or less, and even more preferably 0.5% by mass or less. By containing 2.0% by mass or less of (D) an oil gelling agent having a crosslinked polymer molecular structure, the fluidity of the cleansing composition becomes better.

[0080] The cleansing composition of this embodiment preferably contains 0.01% by mass or more of (E) alkali metal ions, more preferably 0.03% by mass or more. It also preferably contains 0.0005% by mass or more of (E) magnesium ions, more preferably 0.001% by mass or more. This allows for better suppression of pH fluctuations over time in the cleansing composition, and improves the stability of the cleansing composition over time. Meanwhile, by including at least one of (E) alkali metal ions or magnesium ions in a total amount of preferably 2.0% by mass or less, more preferably 1.0% by mass or less, the fluidity of the cleansing composition is improved.

[0081] The cleansing composition of this embodiment preferably contains 1.0% by mass or more of surfactant (F), more preferably 3.0% by mass or more. By containing 1.0% by mass or more of surfactant (F), the stability of the cleansing composition over time becomes better. Furthermore, the cleansing composition of this embodiment preferably contains 10.0% by mass or less of surfactant (F), more preferably 8.0% by mass or less. By containing 10.0% by mass or less of surfactant (F), the feel of use of the cleansing composition can be improved.

[0082] The cleansing composition of this embodiment preferably contains 7.0% by mass or more, more preferably 10.0% by mass or more, of an oily component (G) other than the above (A) and (B). By containing 5.0% by mass or more of the oily component (G) other than the above (A) and (B), dirt from makeup cosmetics and the like can be more sufficiently removed. Furthermore, the cleansing composition of this embodiment preferably contains 30.0% by mass or less, more preferably 20.0% by mass or less, of an oily component (G) other than the above (A) and (B). By containing 30.0% by mass or less of the oily component (G) other than the above (A) and (B), the cleansing composition after use on the skin, etc., can be more easily removed with water.

[0083] The cleansing composition of this embodiment preferably contains 50.0% by mass or more of water, more preferably 60.0% by mass or more. By containing 50.0% by mass or more of water, a more refreshing feeling can be imparted. Furthermore, the cleansing composition of this embodiment preferably contains 90.0% by mass or less of water, more preferably 85.0% by mass or less of water. By containing 90.0% by mass or less of water, dirt such as makeup cosmetics can be more sufficiently removed.

[0084] The preferred blend ratios of the components contained in the cleansing composition of this embodiment are as follows.

[0085] In the cleansing composition of this embodiment, the proportion of hydrocarbon oils (hydrocarbon compounds) having a molecular weight of 400 or less (preferably a molecular weight of 300 or less) is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 98% by mass or more. All of the hydrocarbon oils (hydrocarbon compounds) may be hydrocarbon oils having a molecular weight of 400 or less (preferably a molecular weight of 300 or less). By increasing the proportion of hydrocarbon oils having a molecular weight of 400 or less (preferably a molecular weight of 300 or less), dirt from makeup cosmetics and the like can be more sufficiently removed.

[0086] In the cleansing composition of this embodiment, the proportion of hydrocarbon oils having a molecular weight of 400 or less (preferably a molecular weight of 300 or less) in the oil content is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more. By increasing the proportion of hydrocarbon oils having a molecular weight of 400 or less (preferably a molecular weight of 300 or less), dirt such as makeup cosmetics can be more sufficiently removed.

[0087] The cleansing composition of this embodiment preferably contains 60 to 90 parts by mass of the hydrocarbon oil (A) relative to 100 parts by mass of the total of the hydrocarbon oil (A) and the amphipathic liquid oil (B). This allows for more sufficient removal of stains (cosmetic stains) from makeup cosmetics and the like. More preferably, the cleansing composition contains 70 parts by mass or more of the hydrocarbon oil (A) relative to 100 parts by mass of the total of the hydrocarbon oil (A) and the amphipathic liquid oil (B).

[0088] The cleansing composition of the present embodiment preferably contains 1 to 30 parts by mass, more preferably 2 to 20 parts by mass, and even more preferably 3 to 10 parts by mass of (D) an oil gelling agent having a crosslinked polymer molecular structure, relative to 100 parts by mass of the total of (A) the hydrocarbon oil and (B) the amphipathic liquid oil, thereby enabling more sufficient removal of stains from makeup cosmetics and the like (cosmetic stains).

[0089] The cleansing composition of this embodiment preferably contains (E) at least one of alkali metal ions and magnesium ions in a total amount of 0.1 to 15.0 parts by mass per 100 parts by mass of the water-soluble acrylic polymer (C), thereby enabling more sufficient removal of stains from makeup cosmetics and the like (cosmetic stains).

[0090] The cleansing composition of this embodiment preferably contains 10 to 50 parts by mass of (F) surfactant per 100 parts by mass of the total of (A) the hydrocarbon oil, (B) the amphipathic liquid oil, and (G) the oily component. This allows for more sufficient removal of stains from makeup cosmetics and the like (cosmetic stains). More preferably, the cleansing composition contains 40 parts by mass or less of (F) surfactant per 100 parts by mass of the total of (A) the hydrocarbon oil, (B) the amphipathic liquid oil, and (G) the oily component.

[0091] The cleansing composition of this embodiment preferably contains the above-mentioned (A) hydrocarbon oil, (B) amphipathic liquid oil, and (G) oily component in a total amount of 10 to 50 parts by mass, and more preferably 20 to 30 parts by mass, per 100 parts by mass of water, which allows for more sufficient removal of stains from makeup cosmetics and the like (cosmetic stains).

[0092] The pH of the cleansing composition of this embodiment may be 3.0 or more and 6.0 or less, preferably 4.0 or more and 5.5 or less. The pH range described above improves the fluidity of the cleansing composition. This pH range is particularly preferred when the water-soluble acrylic polymer molecule contains an anionic group that can be neutralized.

[0093] In addition to the above-mentioned ingredients, the cleansing composition of the present embodiment may further contain, for example, a general moisturizer, a water-soluble thickener (excluding the above-mentioned water-soluble acrylic polymer), a fragrance, or a preservative.

[0094] The cleansing composition of the present embodiment may be in the form of a viscous liquid, for example, an oil-in-water formulation in which an oily component is dispersed in an aqueous component, and is not particularly limited in nature.

[0095] The above-mentioned cleansing composition may be applied to, for example, facial skin, neck skin, limb skin, scalp, eyelashes, eyebrows, or hair, or mucous membranes. The above-mentioned cleansing composition may be applied to skin to which makeup cosmetics have been applied, and then blended into the makeup cosmetics on the skin with the user's fingers or the like. Alternatively, the above-mentioned cleansing composition may be applied to hair to which a used hair styling product has been applied, and then blended into the hair styling product with the user's fingers or the like. Examples of makeup cosmetics include foundation, sunscreen, eye shadow, eyeliner, eyebrow makeup, mascara, blush, face powder, lipstick, etc. Examples of hair styling products include styling agents, hair oils, hair gels, and hair sprays. Makeup cosmetics or hair styling products usually cover the skin or hair in the form of a coating film containing a relatively large amount of oil and powder.

[0096] The cleansing composition of this embodiment can be produced by a general method. For example, the components to be blended are mixed and stirred to produce the cleansing composition. A general stirring device can be used. If necessary, the mixture may be stirred while being heated.

[0097] The cleansing composition of the present embodiment is not necessarily restricted to the classification of cosmetics, quasi-drugs, pharmaceuticals, etc. under the Pharmaceutical and Medical Device Act.

[0098] The cleansing composition of the present invention is as exemplified above, but the present invention is not limited to the above-exemplified embodiments. In addition, the present invention can employ various forms employed in general cleansing compositions, etc., within the scope that does not impair the effects of the present invention.

[0099] The present specification discloses the following: (1) A cleansing composition comprising a hydrocarbon oil having a molecular weight of 400 or less, an amphiphilic liquid oil having multiple ether groups in the molecule, a water-soluble acrylic polymer having structural units derived from (meth)acrylic acid in the molecule, an oil gelling agent having a crosslinked polymer molecular structure, and at least one of an alkali metal ion and a magnesium ion. (2) The cleansing composition according to (1) above, wherein the amphiphilic liquid oil further has multiple ester groups in the molecule. (3) The cleansing composition according to (1) or (2) above, wherein a portion of the side chains of the water-soluble acrylic polymer have anionic groups. (4) The cleansing composition according to any one of (1) to (3) above, wherein the oil gelling agent has an organopolysiloxane structure in the molecule. (5) The cleansing composition according to any one of (1) to (4) above, wherein the hydrocarbon oil has a molecular weight of 300 or less. (6) The cleansing composition according to any one of (1) to (5) above, wherein the amphipathic liquid oil comprises at least one of an addition polymer of an alkylene oxide, an addition polymer of a mixture of an alkylene oxide and a polyol, and a dehydration condensate (esterification reaction product) of a carboxylic acid compound and a monool. (7) The cleansing composition according to (6) above, wherein the addition polymer of an alkylene oxide comprises at least one selected from the group consisting of triethylene glycol, tetraethylene glycol, tripropylene glycol, and tetrapropylene glycol. (8) The cleansing composition according to (6) above, wherein the addition polymer of a mixture of an alkylene oxide and a polyol comprises an addition polymer of a mixture of at least one alkylene oxide selected from ethylene oxide, propylene oxide, and butylene oxide, and at least one polyol selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, and glycerin. (9) The cleansing composition according to (6) above, wherein the dehydration condensation product of the carboxylic acid compound and the monool is a dehydration condensation product of one molecule of a dicarboxylic acid compound having a plurality of carboxy groups in the molecule and two molecules of a monool having an ether group in the molecule.(10) The cleansing composition according to any one of (1) to (9) above, wherein the oil gelling agent comprises at least one crosslinked methylpolysiloxane selected from the group consisting of dimethicone / vinyl dimethicone crosspolymer, dimethicone / phenyl vinyl dimethicone crosspolymer, vinyl dimethicone / lauryl dimethicone crosspolymer, and lauryl polydimethylsiloxyethyl dimethicone / bis vinyl dimethicone crosspolymer. (11) The cleansing composition according to any one of (1) to (10) above, which comprises the alkali metal ion and further comprises an organic acid.

[0100] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0101] (Each Example and Each Comparative Example) Each cleansing composition was prepared by mixing the ingredients by a general method according to the formulation shown in any of Tables 1 to 3. Details of the ingredients used are shown below. (A) [Hydrocarbon oil with a molecular weight of 400 or less] (A-1) Tetradecane (commercially available product) (A-2) Mineral oil (liquid paraffin) (molecular weight: approximately 330) (commercially available product) (a) [Hydrocarbon oil with a molecular weight of more than 400] (a-1) Hydrogenated polyisobutene (heavy liquid isoparaffin) molecular weight: approximately 1150 (a-2) Squalane (molecular weight: approximately 420) (commercially available product) (B) [Amphiphilic liquid oil having multiple ether groups in the molecule] (B-1) Cyclohexane-1,(B-1) 4-bisethoxydiglycol dicarboxylate (commercially available product) (B-2) polyethylene glycol (PEG) / polypropylene glycol (PPG) / polybutylene glycol (PBG)-8 / 5 / 3 glycerin (commercially available product) (B-3) tripropylene glycol (commercially available product) (C) [Water-soluble acrylic polymer having a structural unit derived from (meth)acrylic acid in the molecule] (C-1) ammonium dimethyl taurate acrylate / vinylpyrrolidone copolymer Product name: "Aristoflex AVC" manufactured by Clariant Japan (purity: approximately 100%) *not in salt form (C-2) acrylates / alkyl acrylate (C10-30) crosspolymer Product name: "PEMULEN TR-1" manufactured by BFgoodrich (purity: approximately 100%) *not in salt form (C-3) carbomer Product name: "Carbopol 940” manufactured by Lubrizol (purity approximately 100%) (D) [Raw material containing an oil gelling agent having a crosslinked polymer molecular structure] (D-1) A mixed raw material containing 25% by mass of (dimethicone / vinyl dimethicone) crosspolymer (oil gelling agent in a dispersed state) and 75% by mass of dimethicone. Product name: “KSG-16” manufactured by Shin-Etsu Chemical Co., Ltd. (D-2) A mixed raw material containing 20% ​​by mass of (vinyl dimethicone / lauryl dimethicone) crosspolymer (oil gelling agent in a dispersed state) and 80% by mass of isododecane. Product name: “KSG-42A” manufactured by Shin-Etsu Chemical Co., Ltd. (E) [Raw material containing alkali metal ions] (E-1) Sodium citrate (commercially available product) (not hydrated) (E-2) Magnesium sulfate (commercially available product) (not hydrated) (F) [Surfactants] (F-1) PEG-20 glyceryl triisostearate HLB = 8.0 (F-2) Sorbeth-6 laurate (POE (6) sorbitol monolaurate) HLB = 15.5 (G) [Oil components other than (A) and (B) above] (G-1) 2-ethylhexyl palmitate (commercially available product) (G-2) Phenyl trimethicone (commercially available product) (G-3) Dimethicone (commercially available product) (G-4) Glyceryl tri(behenate / isostearate / eicosanedioate) (commercially available product),

[0102]

[0103]

[0104]

[0105] An evaluation test (cleansing performance evaluation test) was conducted on each cleansing composition produced as described above. <Evaluation: Cleansing Performance> 1. First, the L value of a white Bioskin (simulated skin material) was measured using a color difference meter. The average of measurements taken at three randomly selected locations was taken as the initial L value. 2. 0.02 g of oily mascara (commercially available product) was evenly applied to a square area of ​​the Bioskin, measuring 2.5 cm on a side, and allowed to dry for at least one hour. 3. The L value (post-application L value) on the Bioskin to which the oily mascara had been applied was obtained in the same manner as described above. 4. 0.1 g of the cleansing composition of each Example or Comparative Example was applied to the oily mascara on the Bioskin, and the surface of the Bioskin was stroked with the cleansing composition over the oily mascara while applying a load of 200 g with one finger, in a circular motion of 40 times (10 right-handed rotations and 10 left-handed rotations, repeated twice each). The cleansing operation was performed on an electronic balance so that the magnitude of the load could be determined, and was performed with a nearly constant load. 4. The cleansing composition was rinsed with 500 mL of running water (tap water). 5. After drying for 1 hour or more, the L value of the Bioskin after rinsing was measured to obtain the L value after cleansing. 6. The cleansing performance (cleansing power) was calculated using the following formula: Cleansing performance = [(L value after cleansing - L value after application) / (initial L value - L value after application)] x 100

[0106] The evaluation results of the cleansing performance are shown in Figure 1. Note that Figure 1 shows relative values ​​when the cleansing performance of Example 1 is set to 1. As can be seen from Figure 1, cleansing compositions containing (A) a hydrocarbon oil having a molecular weight of 400 or less, (B) an amphiphilic liquid oil having multiple ether groups in the molecule, (C) a water-soluble acrylic polymer having a (meth)acrylic acid-derived structural unit in the molecule, (D) an oil gelling agent having a crosslinked polymer molecular structure, and (E) an alkali metal ion had good cleansing performance. On the other hand, cleansing compositions not containing any of the above (A) to (E) did not have good cleansing performance.

[0107] As can be seen from the above results, the cleansing compositions corresponding to the Examples were able to exhibit good cleansing performance.

[0108] <Stability over time> Furthermore, the cleansing compositions of each Example and Comparative Example were evaluated for stability over time by the following stability test method. Specifically, each cleansing composition was left to stand in a thermostatic bath at 50°C for one month, and then the emulsified state was visually observed and judged according to the following evaluation criteria. (Evaluation criteria) Good (◯): The emulsified state is good. No separation or viscosity decrease is observed. Slightly poor (Δ): The emulsified state is slightly poor. Some separation or viscosity decrease is observed. Poor (×): The emulsified state is poor. Significant separation or viscosity decrease is observed.

[0109] As a result of the evaluation of stability over time, Examples 5 and 6 were rated "slightly poor," while the others were rated "good." By incorporating an acrylates / C10-30 alkyl acrylate crosspolymer or ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer as the component (C) (water-soluble acrylic polymer), the stability over time of the cleansing composition was improved. By incorporating a dimethicone / vinyl dimethicone crosspolymer as the component (D) (oil gelling agent), the stability over time of the cleansing composition containing liquid silicone was improved.

[0110] The cleansing composition of the present invention can be used, for example, as a cleansing agent for removing makeup cosmetics such as foundation or lipstick remaining on the skin, or hair styling products attached to hair, etc. The cleansing composition of the present invention is preferably used, for example, by applying it onto makeup cosmetics that have been applied to the skin, or by applying it to used cosmetics that have been attached to hair, such as hair.

Claims

1. A cleansing composition comprising: a hydrocarbon oil having a molecular weight of 400 or less; an amphiphilic liquid oil having a plurality of ether groups in the molecule; a water-soluble acrylic polymer having a structural unit derived from (meth)acrylic acid in the molecule; an oil gelling agent having a crosslinked polymer molecular structure; and at least one of an alkali metal ion or a magnesium ion.

2. The cleansing composition according to claim 1, wherein the amphiphilic liquid oil further has a plurality of ester groups in the molecule.

3. The cleansing composition according to claim 1 or 2, wherein a portion of the side chains of the water-soluble acrylic polymer has an anionic group.

4. The cleansing composition according to claim 1 or 2, wherein the oil gelling agent has an organopolysiloxane structure in its molecule.

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