Cosmetic composition

Abstract

To provide a cosmetic composition which, even in the form of a microemulsion, achieves relatively high viscosity, excellent post-use moisturizing performance, and stability at the same time.SOLUTION: The cosmetic composition of the present invention is an oil-in-water cosmetic composition comprising a nonionic surfactant, a water-soluble polymer, and a liquid oil, the composition being in the form of a microemulsion having an average oil droplet particle diameter of 120 nm or less, wherein the water-soluble polymer comprises at least one selected from the group consisting of a nonionic hydrophobically associating thickener, a copolymer of (meth)acrylate salt and acryloyldimethyltaurate salt, a copolymer of (meth)acrylate ester and acryloyldimethyltaurate salt, and sodium polyacrylate starch, and the liquid oil comprises an alkane in a range of 13 to 28 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic composition. [Background technology]

[0002] Cosmetic compositions such as cleansing compositions and serum compositions are known in various forms, including creams, emulsions, gels, and liquids. Cosmetic compositions can have phases such as W / O emulsions, O / W emulsions, oily phases, and aqueous phases, and are used according to their type.

[0003] In recent years, consumers have been demanding cleansing lotions that can be applied by wiping onto cotton or nonwoven fabrics, as cleansing compositions that can easily and quickly remove makeup. These cleansing lotions are required to have a light, refreshing feel after use, since the cleansing action of a lotion or the like is performed without washing the face after use.

[0004] Because makeup cosmetics are usually oily, aqueous cleansing compositions such as cleansing lotions may have inferior cleansing power compared to oil-based cleansing cosmetics and emulsion-type cleansing cosmetics. Therefore, there is a demand for technology that improves the cleansing power of aqueous cleansing compositions.

[0005] In contrast, Patent Document 1 discloses an aqueous transparent cleansing composition containing a specific esterified polyglycerol medium-chain fatty acid ester, and claims that this cleansing cosmetic is easily compatible with makeup stains, quickly removes the stains, and has excellent cleansing power.

[0006] Patent Document 2 discloses a cleansing composition containing two specific types of polyglycerol medium-chain fatty acid ester, a liquid oil, and a nonionic surfactant. Patent Document 2 claims to provide a cleansing composition that has better cleansing power and makeup blendability than the composition of Patent Document 1, and is less sticky.

[0007] Patent Document 3 discloses an oil-in-water cleansing composition containing a specific liquid oil and a nonionic surfactant. This cleansing composition has a microemulsion form with oil droplets of less than 100 nm.

[0008] Patent Document 4 discloses a thick oil-in-water composition in the form of a microemulsion containing hydrophobically modified polyether urethane and having oil droplets of 150 nm or less. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-210744 [Patent Document 2] International Publication No. 2020 / 116011 [Patent Document 3] Japanese Patent Application Publication No. 2019-38792 [Patent Document 4] Japanese Patent Application Publication No. 2019-137623 Summary of the Invention [Problem to be solved by the invention]

[0010] In conventional cosmetic compositions, it has been difficult to achieve a relatively high viscosity, high moisturizing properties after use, and stability in the form of a microemulsion.

[0011] Therefore, an object of the present invention is to provide a cosmetic composition that can achieve relatively high viscosity, high moisturizing properties after use, and stability even in the form of a microemulsion. [Means for solving the problem]

[0012] The present invention has the following aspects: <<Aspect 1>> An oil-in-water cosmetic composition comprising a nonionic surfactant, a water-soluble polymer, and a liquid oil, It is in the form of a microemulsion with an average oil droplet size of 120 nm or less, the water-soluble polymer comprises one or more selected from the group consisting of a nonionic hydrophobic group association thickener, a copolymer of a (meth)acrylate salt and an acryloyldimethyl taurate salt, a copolymer of a (meth)acrylic acid ester and an acryloyldimethyl taurate salt, and sodium acrylate grafted starch; and The liquid oil contains an alkane having 13 to 28 carbon atoms. Cosmetic composition. <<Aspect 2>> A cosmetic composition according to aspect 1, having a viscosity at 25°C in the range of 100 mPa to 4000 mPa. Aspect 3 Aspect 1: The cosmetic composition according to aspect 1, wherein 40% by mass or more of the liquid oil contains alkanes having 13 to 28 carbon atoms. Aspect 4 2. The cosmetic composition of claim 1, wherein the nonionic surfactant comprises a polyglycerin fatty acid ester. Aspect 5 2. The cosmetic composition of claim 1, wherein the nonionic surfactant comprises a polyglycerol alkyl ether. Aspect 6 Aspect 2. The cosmetic composition according to aspect 1, wherein the water-soluble polymer comprises a nonionic hydrophobic group associative thickener, and the nonionic hydrophobic group associative thickener is a hydrophobically modified polyether urethane. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a cosmetic composition that can achieve relatively high viscosity, high moisturizing properties after use, and stability, even in the form of a microemulsion. DETAILED DESCRIPTION OF THE INVENTION

[0014] <<Cosmetic Composition>> The cosmetic composition is an oil-in-water composition in the form of a microemulsion, containing a nonionic surfactant, a specific water-soluble polymer, and a specific liquid oil. This cosmetic composition may be any oil-in-water cosmetic in the form of a microemulsion, and may be used for applications such as cleansing compositions, serum compositions, and lotions. This cosmetic composition may have a composition appropriate for each application.

[0015] It has traditionally been difficult to impart viscosity to cosmetic compositions in microemulsion form, but the present inventors have discovered that by using a specific water-soluble polymer and a specific liquid oil, it is possible to achieve high viscosity even in a composition in microemulsion form, and that the composition can contain a large amount of liquid oil while maintaining high stability without undergoing phase inversion, phase separation, etc. Furthermore, it has been found that this cosmetic composition also has a high effect on moisturizing the skin after use.

[0016] Here, the oil-in-water composition is in the form of a microemulsion with an average oil droplet diameter of 120 nm or less. The average particle diameter of the dispersed phase oil droplets may be, for example, 120 nm or less, 100 nm or less, 80 nm or less, or 60 nm or less, or 5 nm or more, 10 nm or more, 20 nm or more, 30 nm or more, 50 nm or more, or 70 nm or more. By adjusting the diameter to such a range, viscosity and transparency can be imparted to the composition. The average particle diameter of the oil droplets is measured using a zeta potential / particle size / molecular weight measurement system (ELSZ-2000ZS, Otsuka Electronics Co., Ltd.).

[0017] The cosmetic composition may have a relatively high viscosity. The viscosity of the cosmetic composition may be 100 mPa·s or more, 200 mPa·s or more, 300 mPa·s or more, 500 mPa·s or more, or 1000 mPa·s or more, or 4000 mPa·s or less, 2000 mPa·s or less, 1000 mPa·s or less, 800 mPa·s or less, 600 mPa·s or less, or 400 mPa·s or less. This viscosity can be measured at 25°C using a Brookfield rotational viscometer (TV-100B type viscometer, Toki Sangyo Co., Ltd.) with spindle No. 3 at 12 rpm. However, if the viscosity measured at 12 rpm is 1500 mPa·s or less, the viscosity is also measured at 60 rpm, and the result is used.

[0018] <Nonionic surfactants> The nonionic surfactant used in the cosmetic composition may be any surfactant commonly used in cosmetics or topical preparations. The hydrophilic-lipophilic balance (HLB) value of the nonionic surfactant may be, for example, 2.0 or more, 3.0 or more, 4.0 or more, 5.0 or more, 6.0 or more, 7.0 or more, 8.0 or more, 9.0 or more, or 10.0 or more, or may be 18.0 or less, 17.0 or less, 16.0 or less, 15.0 or less, 16.0 or less, 15.0 or less, 14.0 or less, 13.0 or less, 12.0 or less, 11.0 or less, or 10.0 or less.

[0019] Specific examples of nonionic surfactants include polyoxyethylene alkyl ethers (laureth-4, laureth-7, laureth-9, laureth-21, laureth-23, ceteth-10, ceteth-20, steareth-2, steareth-20, steareth-21, ceteareth-25, beheneth-20, beheneth-30, oleth-2, oleth-10), polyoxyethylene steryl ethers (PEG-5 phytosterol, PEG-10 phytosterol, PEG-30 phytosterol), polyoxyethylene fatty acid esters (stearic acid PEG-25, PEG-40 stearate, PEG-45 stearate, PEG-55 stearate, PEG-75 stearate, PEG-100 stearate, PEG-150 stearate, PEG-150 distearate), polyoxyethylene polyhydric alcohol fatty acid ester (PEG-7 glyceryl coconut oil fatty acid, PEG-8 glyceryl isostearate, PEG-20 glyceryl isostearate, PEG-60 glyceryl isostearate, PEG-20 glyceryl triisostearate, sorbeth-30 tetraoleate, Sorbeth-40 tetraoleate, Sorbeth-60 tetraoleate), Polyoxyethylene hydrogenated castor oil (PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-100 hydrogenated castor oil), Polyoxyethylene sorbitan fatty acid esters (Polysorbate 20, Polysorbate 60, Polysorbate 80), Glycol fatty acid esters (PG stearate, glycerin fatty acid ester, glyceryl stearate, glyceryl stearate (SE), Glyceryl isostearate glyceryl oleate, glyceryl behenate), polyethylene glycol glycerides (PEG glyceryl caprylate / caprate such as PEG-8 glyceryl caprylate / caprate, PEG-4 glyceryl caprylate / caprate, and PEG-6 glyceryl caprylate / caprate; PEG glyceryl oleate such as PEG-15 glyceryl laurate, PEG-20 glyceryl laurate, PEG-30 glyceryl laurate, PEG-32 glyceryl laurate, PEG-40 glyceryl laurate;PEG glyceryl stearate such as PEG-20 glyceryl stearate and PEG-32 glyceryl stearate; PEG glyceryl oleate such as PEG-6 glyceryl oleate, PEG-20 glyceryl oleate, and PEG-30 glyceryl oleate) fatty acid sorbitan esters (sorbitan laurate, sorbitan palmitate, sorbitan stearate, sorbitan isostearate, sorbitan oleate, sorbitan sesquistearate, sorbitan sesquiisostearate, sorbitan sesquioleate, sorbitan trioleate, sorbitan tristearate) Examples include sorbitan olivate, sorbitan coconutate), sucrose fatty acid esters (sucrose laurate, sucrose palmitate, sucrose stearate, sucrose coconutate), alkyl glyceryl ethers (isostearyl glyceryl ether, chimyl alcohol, selachyl alcohol, batyl alcohol), fatty acid alkanolamides (cocamide DEA, cocamide MEA, lauramide DEA), alkyl glycosides (caprylyl / capryl) glucoside, decyl glucoside, lauryl glucoside, cetearyl glucoside, coconut alkyl glucoside);

[0020] Polyglycerol fatty acid esters can also be used as nonionic surfactants. Polyglycerol fatty acid esters are esters of fatty acids with polyglycerol polymerized from glycerol, and their physical properties can be designed by, for example, changing the degree of polymerization of the hydrophilic polyglycerol. Specifically, examples of polyglycerol fatty acid esters include polyglyceryl-10 dicaprylate, polyglyceryl-6 dicaprate, polyglyceryl-10 dicaprate, polyglyceryl-10 dilaurate, polyglyceryl-10 dimyristate, polyglyceryl-10 distearate, polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 dimacadamia nut fatty acid, polyglyceryl-10 caprylate, polyglyceryl-10 caprate, and polyglyceryl-1 laurate. Examples of suitable glyceryl-10 fatty acids include polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate, macadamia nut fatty acid polyglyceryl-10, polyglyceryl-6 caprylate, polyglyceryl-6 caprate, polyglyceryl-6 laurate, polyglyceryl-6 myristate, polyglyceryl-6 stearate, polyglyceryl-6 isostearate, polyglyceryl-6 oleate, and macadamia nut fatty acid polyglyceryl-6.

[0021] Polyglycerol alkyl ethers can also be used as nonionic surfactants. These are compounds containing polyglycerol obtained by polymerizing glycerol and an alkyl group linked by an ether bond, and their physical properties can be designed by, for example, changing the degree of polymerization of the polyglycerol in the hydrophilic portion. Specific examples of polyglycerol alkyl ethers include polyglyceryl-2 lauryl ether, polyglyceryl-4 lauryl ether, polyglyceryl-10 lauryl ether, polyglyceryl-20 lauryl ether, polyglyceryl-6 myristyl ether, polyglyceryl-3 hydroxylauryl ether, polyglyceryl-8 isostearyl ether, polyglyceryl-10 isostearyl ether, polyglyceryl-3 cetyl ether, and polyglyceryl-2 oleyl ether.

[0022] The content of the nonionic surfactant in the cosmetic composition will vary depending on the application for which the cosmetic composition is to be used, but may be, for example, 3% by mass or more, 5% by mass or more, 6% by mass or more, 8% by mass or more, 10% by mass or more, or 11% by mass or more, and may be 20% by mass or less, 15% by mass or less, 12% by mass or less, 10% by mass or less, or 8% by mass or less.

[0023] <Water-soluble polymer> The cosmetic composition includes a water-soluble polymer, which includes at least one selected from the group consisting of nonionic hydrophobic group association thickeners and acrylic acid-based thickeners (particularly, copolymers of (meth)acrylates and acryloyldimethyl taurates, copolymers of (meth)acrylic acid esters and acryloyldimethyl taurates, and sodium acrylate-grafted starch).

[0024] The nonionic hydrophobic group association thickener is a copolymer having hydrophobic moieties at both ends of a hydrophilic moiety, and exhibits a thickening effect in an aqueous medium when the hydrophobic moieties of the copolymer associate with each other.

[0025] Examples of nonionic hydrophobic group association thickeners include hydrophobically modified polyether urethanes. Examples of hydrophobically modified polyether urethanes include compounds having the following formula (I):

[0026] [ka]

[0027] In the above formula (I), R1, R2, and R4 each independently represent an alkylene group having 2 to 4 carbon atoms or a phenylethylene group, preferably an alkylene group having 2 to 4 carbon atoms; R3 represents an alkylene group having 1 to 10 carbon atoms which may have a urethane bond; R5 represents a linear, branched, or secondary alkyl group having 8 to 36 carbon atoms, preferably 12 to 24 carbon atoms; m is 2 to 5 or 2 to 3, and particularly 2; h is 1 to 3 or 1 to 2, and particularly 1; k is a number from 1 to 500 or 100 to 300; and n is a number from 1 to 200 or 10 to 100.

[0028] A particularly preferred example of the hydrophobically modified polyetherurethane is the hydrophobically modified polyetherurethane having the INCI name "(PEG-240 / Decyltetradeceth-20 / HDI) Copolymer (PEG-240 / HDI Copolymer Bisdecyltetradeceth-20 Ether)." This copolymer is commercially available from ADEKA Corporation under the trade name "ADEKA NOL GT-700."

[0029] The content of the hydrophobically modified polyether urethane is preferably 0.1 to 5% by mass, more preferably 0.2 to 2% by mass, based on the total amount of the cleanser. If the content of the hydrophobically modified polyether urethane falls within the above range, foam elasticity and foam durability can be improved.

[0030] The water-soluble polymer may be an acrylic acid-based thickener, and examples of the acrylic acid-based thickener include polyacrylamide, acrylamide copolymers; (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (acrylamide / ammonium acrylate) copolymer, (acrylic acid / acryloyldimethyltaurate / dimethylacrylamide) crosspolymer, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, acrylic acid / acrylamide / sodium acrylate / sodium acryloyldimethyltaurate copolymer, and (ammonium acryloyldimethyltaurate / methacrylic acid). Examples of the surfactants include (beheneth-25) cross copolymer, (ammonium acryloyldimethyltaurate / steareth-25 methacrylate) crosspolymer, (sodium acrylate / acryloyldimethyltaurate / dimethylacrylamide) crosspolymer, polyacrylate-13, polyacrylate crosspolymer-6, (acrylamidopropyltrimonium chloride / acrylates) copolymer, (acrylates / steareth-20 methacrylate) copolymer, (acrylates / beheneth-25 methacrylate) copolymer, (acrylates / steareth-20 itaconate) copolymer, steareth-10 allyl ether / acrylates copolymer, and sodium acrylate-grafted starch.

[0031] The water-soluble polymer may be a mixture of the various water-soluble polymers described above, or may be used in combination with various other water-soluble polymers known in the art.

[0032] The content of the water-soluble polymer in the cosmetic composition may be, for example, 1.0% by mass or more, 2.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 3.5% by mass or more, or 4.0% by mass or more, and may be 10.0% by mass or less, 8.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, or 4.0% by mass or less. Of 100% by mass of water-soluble polymers, the above-mentioned specific water-soluble polymer may be 30% by mass or more, 50% by mass or more, 70% by mass or more, or 90% by mass or more, or 100% by mass or less, 80% by mass or less, 60% by mass or less, or 40% by mass or less.

[0033] <Liquid oil> The cosmetic composition contains a liquid oil, and the liquid oil may be a long-chain alkane.

[0034] The long-chain alkane is an alkane having 10 or more carbon atoms, preferably 13 to 28. Examples of such long-chain alkanes include n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, n-eicosane, n-heneicosane, n-docosane, tricosane, and tetracosane.

[0035] The liquid oil may be a mixture of long chain alkanes of various carbon numbers and may be used in combination with other liquid oils known in the art.

[0036] The content of the liquid oil in the cosmetic composition may be, for example, 2.0% by mass or more, 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, or 5.0% by mass or more, and may be 10.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, or 5.0% by mass or less. Of 100% by mass of liquid oil, the above-mentioned specific liquid oil may be 20% by mass or more, 40% by mass or more, 60% by mass or more, 80% by mass or more, or 90% by mass or more, or may be 100% by mass or less, 90% by mass or less, 70% by mass or less, or 40% by mass or less.

[0037] <water> The cosmetic composition contains water. The cosmetic composition may contain water in an amount of 30% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 75% by mass or more, and 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, or 75% by mass or less.

[0038] <others> The cleansing composition may further contain other ingredients known in the art, such as pH adjusters, antibacterial agents, moisturizers, whitening agents, antioxidants, blood circulation enhancers, chelating agents, fragrances, preservatives, antioxidants, neutralizing agents, and colorants.

[0039] <<Method for producing cosmetic composition>> The method for producing the cosmetic composition includes a step of mixing the above-mentioned components to obtain a mixture, and a step of emulsifying the mixture.

[0040] The step of emulsifying the mixture is a step of converting the mixture of the components into an oil-in-water composition in the form of a microemulsion. The emulsifying step may involve simply stirring the mixture, as long as the mixture can be emulsified, or the mixture may be emulsified using an emulsifying machine such as a homomixer. However, this cosmetic composition is advantageous because it can be produced using a normal stirrer without using a powerful emulsifying machine such as a homomixer or homogenizer.

[0041] The present invention will be explained in more detail in the following examples, but the present invention is not limited thereto. [Example]

[0042] <Production example> Mixture A was prepared by heating and mixing the nonionic surfactant and liquid oil shown in Table 1. To this was added an aqueous phase prepared by uniformly mixing the water-soluble polymer, 1,3-butylene glycol, and phenoxyethanol shown in Table 1, and the mixture was stirred for 10 minutes to achieve homogenization, thereby preparing the compositions of each example and comparative example. Stirring was performed using a conventional stirrer (Three-One Motor, Shinto Scientific Co., Ltd.).

[0043] "evaluation" <Evaluation of cleansing power> Each cosmetic composition was used as a cleansing composition. The cleansing performance against mascara was evaluated by applying 15 mg of waterproof mascara (Hypercurl Waterproof™, Black, Maybelline) to the arm, wiping the mascara 10 times with a cotton pad soaked in each cosmetic composition (approximately 0.8 mL) at a force and speed comparable to that normally used for wiping, and then evaluating the cleansing performance against lipstick according to the following criteria. The cleansing performance against lipstick was also evaluated in the same manner using a commercially available lipstick (Melty Luminous Rouge 02, Ida Laboratories). ○: Almost completely fell off. △: It fell off a little but it worked. ×: Almost no fall.

[0044] <Moisturizing feeling - moist feeling after washing> Each cosmetic composition was used as a cleansing composition, and approximately 1.5 mL of each composition was applied to the entire face, and the results were evaluated on a 5-point scale. Evaluations were conducted by 14 expert panelists, and the average score was used as the evaluation result. (Evaluation criteria) 1: Very dry 2: Slightly dry 3: Neither 4: Feels slightly moist 5: Feels naturally moisturized

[0045] <Moisturizing feeling - moist feeling after use> Each cosmetic composition was used as a serum composition, and approximately 0.5 mL of each composition was soaked into a cotton pad and applied to the entire face. Evaluation was performed on a 5-point scale. Evaluation was carried out by 14 expert panelists, and the average score was used as the evaluation result. (Evaluation criteria) 1: Very dry 2: Slightly dry 3: Neither 4: Feels slightly moist 5: Feels naturally moisturized

[0046] <viscosity> The viscosity was measured at 25°C using a Brookfield rotational viscometer (TV-100B type viscometer, Toki Sangyo Co., Ltd.) with spindle No. 3 at 12 rpm (examples where the viscosity in the table is 1500 mPa s or more) or 60 rpm (examples where the viscosity in the table is 1500 mPa s or less), and evaluated according to the following criteria.

[0047] <50℃ storage stability> 80 g of each cosmetic composition was placed in a 100 mL glass sample bottle and stored at 50°C for 30 days, after which the appearance was evaluated and the viscosity was measured and evaluated according to the following criteria. ○: Appearance is one layer, viscosity is maintained △: Appearance is one layer, but viscosity has decreased ×: Appearance was two layers and separation was observed

[0048] <5℃ storage stability> 80 g of each cosmetic composition was placed in a 100 mL glass sample bottle and stored at 5°C for 30 days, after which the appearance was evaluated and the viscosity was measured and evaluated according to the following criteria. ○: Appearance is one layer, viscosity is maintained △: The appearance was one layer, but the viscosity increased. ×: The appearance was two layers and separation was observed.

[0049] "result" The compositions and measurement results of each example are shown in Tables 1 and 2 below.

[0050] [Table 1]

[0051] [Table 2]

Claims

1. An oil-in-water cosmetic composition comprising a nonionic surfactant, a water-soluble polymer, and a liquid oil, The oil droplets are in the form of a microemulsion having an average particle size of 120 nm or less, the water-soluble polymer comprises one or more selected from the group consisting of a nonionic hydrophobic group associative thickener, a copolymer of a (meth)acrylate salt and an acryloyldimethyl taurate salt, a copolymer of a (meth)acrylic acid ester and an acryloyldimethyl taurate salt, and sodium acrylate-grafted starch; and The liquid oil contains an alkane having 13 to 28 carbon atoms. Cosmetic composition.

2. 2. The cosmetic composition according to claim 1, wherein the viscosity at 25°C is in the range of 100 mPa to 4000 mPa.

3. The cosmetic composition according to claim 1, wherein 40% by mass or more of the liquid oil contains alkanes having 13 to 28 carbon atoms.

4. The cosmetic composition according to claim 1 , wherein the nonionic surfactant comprises a polyglycerin fatty acid ester.

5. The cosmetic composition according to claim 1 , wherein the nonionic surfactant comprises a polyglycerol alkyl ether.

6. The cosmetic composition according to claim 1, wherein the water-soluble polymer comprises a nonionic hydrophobic group associative thickener, and the nonionic hydrophobic group associative thickener is a hydrophobically modified polyether urethane.

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