Emulsified cosmetic

Abstract

The present invention relates to an emulsified cosmetic which contains the following components (A) and (B): (A) a water-absorbing polymer that is solid at 25°C and has a water absorption magnification that is greater than or equal to 50 times the weight of the water-absorbing polymer itself; and (B) a polyethylene glycol that has an average molecular weight of 1540 to 10,000 and is solid at 25°C. The emulsified cosmetic has a viscosity of 60,000 to 150,000 mPa・s at 25°C.

Description

Emulsified cosmetics

[0001] This invention relates to emulsified cosmetics.

[0002] Polyacrylic acid or its salts are known to produce topical skin preparations that are stringy, have a refreshing feel, and give the skin a firming effect. Furthermore, it has been reported that an oil-in-water type topical skin preparation with a viscosity of 5,000 to 30,000 mPa.s, containing 0.01 to 3.0% by mass of polyacrylic acid or its salt, along with 0.01 to 1.0% by mass of alkyl-modified carboxypolymer and 1.0 to 10.0% by mass of polyethylene glycol with an average molecular weight of 1,000 to 50,000, exhibits excellent long-term stability of stringiness and good skin compatibility (Reference 1). (Reference 1) Japanese Patent No. 4714241

[0003] The present invention relates to an emulsified cosmetic composition containing the following components (A) and (B): (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more, and (B) polyethylene glycol that is solid at 25°C and has an average molecular weight of 1540 to 10000, wherein the viscosity at 25°C is 60000 mPa·s or more and 150000 mPa·s or less.

[0004] This figure shows the fluffy, mousse-like form of the emulsified cosmetic of the present invention. This figure shows the evaluation criteria when the emulsified cosmetic is dispensed onto artificial leather and checked for wrinkles or residue. Detailed description of the invention

[0005] Terms used herein shall be used in the sense commonly used in the art unless otherwise specified.

[0006] Conventional oil-in-water topical skin preparations have stable stringiness, but their form is that of a typical serum or lotion. What is desired is an emulsified cosmetic that is not in the form of a typical serum or lotion like conventional topical skin preparations, but rather in a light, fluffy mousse-like form that spreads well when applied to the skin and does not cause creasing or residue during application.

[0007] As a result of various studies to solve the above-mentioned problems, the present inventors have found that by combining an absorbent polymer that is solid at 25°C with a high water absorption ratio and polyethylene glycol with an average molecular weight of 1540 to 10000 that is solid at room temperature, an emulsified composition having a high viscosity of 60000 to 150000 mPa·s can be obtained, quite unexpectedly, which has a fluffy, mousse-like form, a good feel and spreadability when applied to the skin, and does not easily crease or leave residue when applied.

[0008] The emulsified cosmetic of the present invention has a fluffy, mousse-like form, provides a good feel and spreadability when applied to the skin, and is less prone to creasing or residue during application.

[0009] The present invention is an emulsified cosmetic composition, one form thereof containing the following components (A) and (B): (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more; and (B) polyethylene glycol that is solid at 25°C and has an average molecular weight of 1540 to 10000; and an emulsified cosmetic composition having a viscosity of 60000 mPa·s to 150000 mPa·s at 25°C. The components of the present invention and their content will be described below.

[0010] Component (A) of the present invention is a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times or more its own weight. Generally, the amount of water absorbed by a water-absorbing polymer is often specified by an expression such as "it can absorb several times its own weight in water" (water absorption ratio), as described above, but in this specification, the "water absorption ratio" of a water-absorbing polymer is defined as follows: (1) A predetermined amount of water-absorbing polymer is weighed and a predetermined amount of water is gradually added while stirring. (2) Stirring is performed using a disperser at 2000 r / min for 2 minutes or more to make it uniform. (3) Stirring is stopped and it is left to stand for 12 hours or more. (4) After adjusting to 25°C, the viscosity is measured using a B-type viscometer (VISCOMETER TVB-10: TOKI SANGYO). (5) If the viscosity is less than 4900 mPa·s (25°C), reduce the amount of water added in step (1) and repeat steps (1) to (4) above. If the viscosity exceeds 5100 mPa·s (25°C), increase the amount of water added in step (1) and repeat steps (1) to (4) above. The amount of water added when the viscosity in step (4) is within the range of 5000 ± 100 mPa·s (25°C) is defined as the water absorption rate (X) of the superabsorbent polymer. The water absorption rate is preferably 50 times or more of its own weight, more preferably 100 times or more of its own weight, and even more preferably 200 times or more of its own weight, as a high water-holding capacity is desirable in order to obtain an emulsified cosmetic that has a fluffy mousse-like form and has a good feel and good spreadability when applied to the skin.

[0011] Examples of such water-absorbing polymers that are solid at 25°C include one or more selected from polyacrylic acid or its salts and polyacrylic acid-based polymers. Examples of polyacrylic acid salts include alkali metal salts (e.g., sodium salt, potassium salt, etc.) and organic amine salts (e.g., monoethanolamine salt, diethanolamine salt, triethanolamine salt, triisopropanolamine salt, etc.). Of these, sodium salt, potassium salt, and triethanolamine salt are preferred, and sodium salt is more preferred. Examples of polyacrylic-based polymers include homopolymers of one or more monomers selected from methacrylic acid, acrylic acid esters, methacrylic acid esters, acrylamide, and dimethylacrylamide, or copolymers having two or more monomers selected from acrylic acid, methacrylic acid, acrylic acid esters, methacrylic acid esters, acrylamide, and dimethylacrylamide. The specific component (A) is preferably one or more selected from polyacrylic acid or its salt, sodium polyacrylate graft starch, (sodium polyacrylate / PEG-9 diacrylate) crosspolymer, and sodium carbomer, with polyacrylic acid or its salt and (sodium polyacrylate / PEG-9 diacrylate) crosspolymer being more preferred.

[0012] As component (A), from the viewpoint of obtaining an emulsified cosmetic having a fluffy, mousse-like form and a good feel and good spreadability when applied to the skin, one or more selected from sodium polyacrylate and polyacrylic acid polymers having a crosslinked structure in their molecular structure are preferred. Specifically, it is preferable that it be a crosslinked polyacrylic acid polymer or a salt thereof, or a crosslinked polyacrylic acid polymer. The crosslinked polyacrylic acid polymer may be a homopolymer or a copolymer. As the salt, a sodium salt is preferred. The crosslinked polyacrylic acid polymer is preferably neutralized and in the form of lumps or particles. The polyacrylic acid polymer is also preferably a polyacrylic acid polymer having a crosslinked structure in its molecular structure. Furthermore, as component (A), one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 4500 mPa·s or more in a 0.5% by mass aqueous solution is preferred, one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 5000 mPa·s or more in a 0.5% by mass aqueous solution is more preferred, and one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 6000 mPa·s or more in a 0.5% by mass aqueous solution is even more preferred. Here, the viscosity of the 0.5% by mass aqueous solution is the viscosity value (mPa·s) measured after keeping it warm at 25°C and rotating it for 1 minute (12 r / min) using a B-type rotational viscometer (Toki Sangyo, VISCOMETER TVB-10). Commercially available products of such component (A) include AKIMOUSSE12 (Daito Chemical), AQUPEC MG N40R (Sumitomo Chemical), AQUA KEEP (Sumitomo Chemical), Cosmedia (Bas), and Covacryl MV60 (Sensient). In this invention, from the viewpoint of obtaining a fluffy texture, it is preferable not to include alkyl-modified carboxyvinyl polymer.

[0013] The content of component (A) in the emulsified cosmetic composition of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more, from the viewpoint of obtaining a viscosity of 60,000 mPa·s or more for the emulsified composition and a fluffy feel. Furthermore, from the viewpoint of preventing the generation of polymer-derived clumps and residues, it is preferably 2% by mass or less, more preferably 1% by mass or less, and even more preferably 0.6% by mass or less. Specifically, it is preferably 0.1% by mass or more and 2% by mass or less, more preferably 0.2% by mass or more and 1% by mass or less, and even more preferably 0.3% by mass or more and 0.6% by mass or less.

[0014] Component (B) used in the emulsified cosmetic composition of the present invention is polyethylene glycol with an average molecular weight of 1540 to 10000 and is solid at 25°C. Component (B) has the effect of preventing the formation of unevenness or residue in the coating film when the cosmetic composition is applied to the skin. From the viewpoint of preventing unevenness or residue formation during application, the average molecular weight of the polyethylene glycol used in the present invention is more preferably 4000 to 6000.

[0015] (B) Examples of polyethylene glycols with an average molecular weight of 1540 or more and 10000 or less include polyethylene glycol 1540 (manufactured by Mitsui Chemicals, Inc.), polyethylene glycol 4000, polyethylene glycol 6000 (manufactured by NOF Corporation), etc.

[0016] The content of component (B) in the emulsified cosmetic composition of the present invention is preferably 0.1% to 5% by mass, more preferably 0.3% to 3% by mass, and even more preferably 0.5% to 2% by mass, from the viewpoint of preventing creasing and residue formation of the coating film when the cosmetic composition is applied to the skin. When an associative thickener having a polyoxyethylene chain is used as component (B), its content is preferably less than 0.1% by mass, from the viewpoint of poor skin compatibility during application. The mass ratio of component (A) to component (B) ((A) / (B)) is preferably 0.05 or higher, more preferably 0.1 or higher, preferably 24 or lower, more preferably 1 or lower, and even more preferably 0.6 or lower, from the viewpoint of preventing creasing and residue formation of the coating film when the cosmetic composition is applied to the skin. Specifically, it is preferably 0.05 to 2, more preferably 0.1 to 1, and even more preferably 0.1 to 0.6.

[0017] In the emulsified cosmetic composition of the present invention, it is preferable to further incorporate (C) agar hydrogel particles, in order to enhance the disintegration properties of the mousse-like cosmetic composition and obtain a smooth, spreadable feel. The agar hydrogel particles are those in a gel state and do not include those in a sol state. The agar hydrogel particles used in the present invention are preferably spherical, elliptical, or otherwise approximately spherical in shape, with a volume-based average particle size of 10 to 10,000 μm, particularly 30 to 3,000 μm, from the viewpoint of feel, appearance, and productivity. The volume-based average particle size of gel-like particles can be measured by laser diffraction scattering for particles of 1,000 μm or less, and by sieving for particles exceeding 1,000 μm.

[0018] The method for producing agar hydrogel particles is not particularly limited, but for example, they can be produced by the following methods. First, agar is mixed with water and heated to a temperature above its dissolution temperature to dissolve it completely. If oily components or powders are to be included in the gel-like particles, an aqueous solution containing the oily components is prepared separately and added and mixed with the agar. From these solutions (mixtures), gel-like particles can be obtained by general dropwise addition, spraying, or stirring methods. The spraying method involves using a spray nozzle to spray the dispersion into the gas phase, forming droplets due to surface tension, and then cooling and solidifying these droplets in the gas phase to produce hydrogel particles. The stirring method involves adding the dispersion to a liquid that has properties that are substantially immiscible with the dispersion and is heated to a temperature higher than its gelation point, and then utilizing the property that the dispersion is atomized by the shear force of stirring and forms droplets due to interfacial tension, and then cooling and solidifying these droplets in a liquid that is substantially immiscible with the dispersion to produce hydrogel particles. The dropper method is a method for producing hydrogel particles by discharging a dispersion from a hole, utilizing the property that the discharged dispersion forms droplets due to its surface tension or interfacial tension, and then cooling and solidifying these droplets in a gas phase such as air or in a liquid phase. From the viewpoint of producing hydrogel particles with uniform particle size, it is preferable to vibrate the dispersion discharged from the hole. Alternatively, hydrogel particles can also be produced by crushing the lumpy, non-crosslinked hydrogel formed by cooling and gelling the dispersion with a stirrer, or by crushing it through a sieve to form particles. While there are no particular limitations on the agar used here, the gel strength of the agar (Japanese Agar Water Method) is 147 kPa (1500 g / cm²) from the viewpoint of the feel when applied to the skin. 2 Preferably, it should be 19.6 kPa (200 g / cm³) or less, and less than 19.6 kPa (200 g / cm³). 2 ) ~ 127kPa (1300g / cm 2 It is more preferable that the gel has the following properties. The gel strength is determined by preparing a 1.5% by mass aqueous solution of agar, leaving the solution at 20°C for 15 hours to solidify, and then applying a load to the gel using a Japanese-style gel strength measuring instrument (manufactured by Kiya Seisakusho Co., Ltd.). The gel withstands the load for 20 seconds at 20°C when its surface area is 1 cm². 2The maximum mass per unit (g) can be determined. As raw material agar, commercially available products such as Ina Agar PS-84 Z-10, AX-30, AX-100, AX-200, T-1, S-5, M-7, UP-16, CS-16A CS-420, and CS-670 (all manufactured by Ina Food Industry Co., Ltd.) can be used.

[0019] As for the agar hydrogel particles, crushed agar gel obtained by pulverizing agar hydrogel is preferred. From the viewpoint of obtaining an emulsified cosmetic that has a fluffy, mousse-like form and a good feel and good spreadability when applied to the skin, the particle size is preferably in the range of 1 to 1000 μm with an agar concentration in the range of 0.5 to 2.0% by mass, more preferably in the range of 30 to 400 μm, and even more preferably in the range of 50 to 250 μm.

[0020] The content of component (C) in the emulsified cosmetic composition of the present invention is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more, from the viewpoint of obtaining a smooth feel. Furthermore, from the viewpoint of ensuring a good feel, it is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 65% ​​by mass or less. Specifically, it is preferably 10% by mass or more and 80% by mass or less, more preferably 20% by mass or more and 70% by mass or less, and even more preferably 30% by mass or more and 65% by mass or less. Furthermore, from the viewpoint of preventing creasing and residue formation of the coating film when the cosmetic composition is applied to the skin, the mass ratio of component (C) to component (B) in the emulsified cosmetic composition of the present invention ((C) / (B)) is preferably 0.01 or more and 5 or less, more preferably 0.03 or more and 3 or less, and even more preferably 0.05 or more and 2 or less.

[0021] In addition to the above-mentioned components, the emulsified cosmetic composition of the present invention may contain water, ultraviolet absorbers, ultraviolet scattering agents, oils, nonionic surfactants, moisturizing ingredients, alcohols, water-soluble polymers, neutralizing agents, pH adjusters, bactericides, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, cooling agents, insect repellents, physiologically active ingredients, salts, antioxidants, fragrances, and the like.

[0022] The ultraviolet absorber (D) used in the present invention can be one or more selected from (D1) liquid ultraviolet absorbers and (D2) solid ultraviolet absorbers. In the present invention, "solid" means a state in which the substance does not exhibit fluidity and maintains a constant shape under an environment of 1 atmosphere and 25°C, that is, a state under temperature conditions below the melting point (or, in the case of amorphous substances that do not have a melting point, a state under temperature conditions below the melting point). On the other hand, "liquid" means a state in which the substance has fluidity under an environment of 1 atmosphere and 25°C, that is, a state under temperature conditions above the melting point (or, in the case of amorphous substances that do not have a melting point, a state under temperature conditions above the melting point).

[0023] (D1) Liquid UV absorbers are organic UV absorbers that are liquid at 25°C, and examples include cinnamic acid-based UV absorbers such as 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, isopropyl paramethoxycinnamate / diisopropyl cinnamic acid ester mixture, and methylbis(trimethylsiloxy)silylisopentyl trimethoxycinnamate; paraaminobenzoic acid-based UV absorbers such as amyl paradimethylaminobenzoate and 2-ethylhexyl paradimethylaminobenzoate; salicylic acid-based UV absorbers such as ethylene glycol salicylate, 2-ethylhexyl salicylate, butyloctyl salicylate, benzyl salicylate, and homomentyl salicylate; octocrylene; dimethicone diethyl benzalmalonate; and copolymers in which the ends of a copolymer of adipic acid and neopentyl glycol are sealed with octyldodecanol or cyanodiphenylpropenoic acid. These liquid organic ultraviolet absorbers can be contained individually or in appropriate combinations of two or more types.

[0024] Examples of commercially available liquid organic UV absorbers include "UVINUL MC80" (2-ethylhexyl paramethoxycinnamate, listed name: ethylhexyl methoxycinnamate, manufactured by BASF); "PARSOL 340" (listed name: octocrylene, manufactured by DSM Nutrition Japan Co., Ltd.); "PARSOL EHS" (2-ethylhexyl salicylate); "PARSOL Examples include "HMS" (homomenthyl salicylate), "PARSOLSLX" (polysilicone-15 (INCI name: Polysilicone-15) (dimethicone diethyl benzalmalonate)) (both manufactured by DSM); and "Polycrylene" (polyester-8 (INCI name: Polyester-8) (a copolymer of adipic acid and neopentyl glycol, with the ends sealed with octyldodecanol or cyanodiphenylpropenoic acid)) (manufactured by Hallstar).

[0025] (D2) Examples of solid ultraviolet absorbers include organic ultraviolet absorbers that are solid at 25°C, such as 4-tert-butyl-4'-methoxydibenzoylmethane, hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate, drometrizole trisiloxane, and ferulic acid. These ultraviolet absorbers can be included individually or in combination of two or more.

[0026] Among these, the solid UV absorbers are preferably 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5- One or more selected from the group consisting of triazine, dromedrizole trisiloxane, and ferulic acid, more preferably one or more selected from the group consisting of 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, and dromedrizole trisiloxane.

[0027] Commercially available solid UV absorbers include "PARSOL 1789" (4-tert-butyl-4'-methoxydibenzoylmethane) (manufactured by DSM); "UVINUL A PLUS" (2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate); "UVINUL T-150" (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, display name: ethylhexyltriazone); "UVINUL M40" (2-hydroxy-4-methoxybenzophenone); "TINOSORB S" (2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine) (all manufactured by BASF); and "Mosacare Examples include "A440" (drometrizole trisiloxane) (manufactured by UFC Corporation) and "Soft Shade DH" (2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate) (manufactured by Ajinomoto Co., Inc.).

[0028] The content of the (D) ultraviolet absorber in the emulsified cosmetic of the present invention is preferably 2% by mass or more and 30% by mass or less, more preferably 3% by mass or more and 25% by mass or less, and still more preferably 5% by mass or more and 20% by mass or less, from the viewpoints of improving the ultraviolet protection effect and improving the elongation of the cosmetic.

[0029] The (E) oil agent used in the present invention is an oil agent that is liquid at 25 ° C. other than the component (D1). Examples of the oil agent that is liquid at 25 ° C. include ester oils, silicone oils, hydrocarbon oils, higher alcohols, higher fatty acids, and the like. These liquid oil agents can be contained alone or in appropriate combination of two or more.

[0030] Examples of the ester oil include synthetic ester oils and natural fats and oils. For example, esters of monovalent carboxylic acids and monovalent alcohols, esters of monovalent carboxylic acids and polyhydric alcohols, and esters of polyhydric carboxylic acids and monovalent alcohols can be mentioned. Examples of the ester of a monovalent carboxylic acid and a monovalent alcohol include esters represented by the following general formula (1).

[0031]

[0032] (In the general formula (1), R 1 represents an alkyl group or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group, or an aromatic-containing hydrocarbon group having 6 to 24 carbon atoms, and R 2 represents an alkyl group or alkenyl group having 1 to 30 carbon atoms in a straight chain or branched chain. ) When R 1 is an alkyl group or alkenyl group, the number of carbon atoms of R 1 is preferably 7 or more, and preferably 23 or less, more preferably 21 or less, still more preferably 19 or less, and even more preferably 17 or less. When R 1 is an aromatic-containing hydrocarbon group, the number of carbon atoms of R 1 is preferably 6 or more, and preferably 22 or less, more preferably 20 or less. R 2The number of carbon atoms is preferably 2 or more, and is preferably 28 or less, more preferably 24 or less, still more preferably 22 or less, and even more preferably 20 or less. Specific examples of the ester represented by the general formula (1) include cetyl isooctanoate (cetyl 2-ethylhexanoate), stearyl isooctanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isostearyl laurate, butyl myristate, isopropyl myristate, decyl myristate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, isostearyl palmitate, 2-hexyldecyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, ethyl oleate, isodecyl oleate, oleyl oleate, 2-octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, lanolin acetate, methyl castor oil fatty acid (methyl ricinoleate), and alkyl benzoate (alkyl having 12 to 15 carbon atoms). One or more selected from the group consisting of these are exemplified.

[0033] As an ester of a monovalent carboxylic acid and a monovalent alcohol, an ester represented by the following general formula (2) is also exemplified.

[0034]

[0035] (In the general formula (2), R 3 represents a linear or branched alkyl group or alkenyl group having 1 to 25 carbon atoms, which may be substituted with a hydroxyl group, and R 4 represents an aromatic-containing hydrocarbon group having 6 to 24 carbon atoms. AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents an average addition mole number of 1 to 50.) R 3 is preferably an alkyl group having 7 or more carbon atoms, and is preferably 23 or less, more preferably 21 or less, and still more preferably 19 or less. R 4The group is preferably an aromatic hydrocarbon group having 6 or more carbon atoms, preferably 22 or fewer, more preferably 20 or fewer, and even more preferably 18 or fewer carbon atoms, and even more preferably a benzyl group. The alkylene oxy group represented by AO is preferably a propylene oxy group, and n is preferably 1 to 10, more preferably 1 to 5. Specific examples of esters represented by general formula (2) include esters of myristic acid and a 3-mol adduct of benzyl alcohol propylene oxide (Crodamol STS, manufactured by Croda), and esters of 2-ethylhexanoic acid and a 3-mol adduct of benzyl alcohol propylene oxide (Crodamol SFX, manufactured by Croda).

[0036] Examples of esters of monocarboxylic acids and polyhydric alcohols include esters represented by the following general formula (3).

[0037]

[0038] (In general formula (3), R 5 R represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms, R6 represents a monohydric carboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer between 2 and 10. 5 The group may have an ether bond, but is preferably a linear or branched hydrocarbon group having 2 to 10 carbon atoms. Furthermore, p is preferably the same number as the hydroxyl groups present in the polyhydric alcohol. 6The alkyl group preferably has 5 or more carbon atoms, more preferably 7 or more, and, from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, even more preferably 19 or less, and even more preferably 17 or less. Examples of esters represented by general formula (3) include propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol di2-ethylhexanoate, di(caprylic / capric acid)propanediol, propanediol diisostearate, ethylene glycol di2-ethylhexanoate, caprylic / capric acid triglyceride, glyceryl tri2-ethylhexanoate, glyceryl tri2-heptylundecanoate, trimethylolpropane tri2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, and natural oils and fats. Examples of natural oils and fats include triglycerides from avocado oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, and mink oil.

[0039] Esters of polycarboxylic acids and monohydric alcohols include those represented by the following general formula (4).

[0040]

[0041] (In general formula (4), R 7 R is a polyvalent carboxylic acid residue having 2 to 10 carbon atoms. 8 (where represents a monohydric alcohol residue with 1 to 25 carbon atoms, and q is an integer between 2 and 10). Furthermore, q is preferably the same number as the carboxyl groups present in the polyhydric carboxylic acid. 8 The number of carbon atoms is preferably 3 or more, and, from the same viewpoint as above, preferably 23 or less, more preferably 21 or less, and even more preferably 19 or less. Specifically, examples include diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, diisopropyl sebacate, and tri-2-ethylhexyl trimellitate.

[0042] Among these, the ester oil is preferably an ester represented by general formula (1), general formula (3), or general formula (4) from the viewpoint of emulsification stability and usability such as preventing stickiness of cosmetics, and more preferably a monoester of a linear or branched fatty acid having 8 to 18 carbon atoms and a linear or branched monohydric alcohol having 2 to 24 carbon atoms, a triester of a branched fatty acid having 6 to 18 carbon atoms and glycerin, a tetraester of a branched fatty acid having 6 to 18 carbon atoms and pentaerythritol, a diester of a linear or branched fatty acid having 6 to 18 carbon atoms and a branched dihydric alcohol having 2 to 10 carbon atoms, a triester of a branched monohydric alcohol having 6 to 18 carbon atoms and trimellitic acid, and alkyl benzoates (C12-15) (for example, "Finsolv TN" (Innospec Active Chemicals) It is one or more selected from the group consisting of (LLC made), and more preferably one or more selected from the group consisting of cetyl 2-ethylhexanoate, isononyl isononanoate, isotridecyl isononanoate, octyldodecyl myristate, isopropyl palmitate, glyceryl tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl sebacate, tri-2-ethylhexyl trimellitate, and alkyl benzoates (C12-15).

[0043] The silicone oil is preferably dimethylpolysiloxane, and more preferably has a kinematic viscosity of 5000 mmHg at 25°C, from the viewpoint of usability, such as preventing stickiness in cosmetics. 2The silicone oil is dimethylpolysiloxane with a viscosity of 0.5 / s or less. The kinematic viscosity of the silicone oil at 25°C can be measured using an Ubbelohde viscometer in accordance with ASTM D 445-46T or JIS Z 8803. Commercially available silicone oils include "KF-96A-1cs" (dimethylpolysiloxane), "KF-96L-2cs" (dimethylpolysiloxane), "KF-96A-6cs" (dimethylpolysiloxane), "KF-96A-10cs" (dimethylpolysiloxane), "KF-96A-20cs" (dimethylpolysiloxane), and "KF-96A-100cs" (dimethylpolysiloxane), all manufactured by Shin-Etsu Chemical Co., Ltd.

[0044] Specific examples of the hydrocarbon oil include liquid paraffin, hydrogenated polyisobutene (liquid isoparaffin, heavy liquid isoparaffin), cycloparaffin, liquid ozoke, lyte, squalene, squalane, pristane, α-olefin oligomer, polybutene, isohexadecane, etc. Examples of the higher alcohol include branched or unsaturated higher alcohols having 12 to 24 carbon atoms, such as 2-octyldodecanol, isostearyl alcohol, and oleyl alcohol. Among these, branched or unsaturated higher monohydric alcohols having 12 to 24 carbon atoms are preferred. Examples of the higher fatty acid include fatty acids having 12 to 22 carbon atoms, such as oleic acid and isostearic acid.

[0045] The content of (E) oil in the emulsified cosmetic composition of the present invention is preferably 3% by mass or more and 10% by mass or less, from the viewpoint of the feel of the cosmetic composition, such as preventing stickiness.

[0046] The content of ester oil (including the UV absorber) in the emulsified cosmetic composition of the present invention is preferably 5% by mass or more, more preferably 6% by mass or more, even more preferably 7% by mass or more, and also preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 18% by mass or less, from the viewpoint of improving skin compatibility upon application and reducing stickiness. Specifically, it is preferably 5% by mass or more and 25% by mass or less, more preferably 6% by mass or more and 20% by mass or less, and even more preferably 7% by mass or more and 18% by mass or less.

[0047] The emulsified cosmetic composition of the present invention preferably contains (F) water from the viewpoint of usability. From the viewpoint of good usability and good spreadability of the cosmetic composition, the water content in the emulsified cosmetic composition of the present invention is preferably 20% by mass or more and 90% by mass or less, more preferably 25% by mass or more and 85% by mass or less, and even more preferably 30% by mass or more and 80% by mass or less.

[0048] The (G) nonionic surfactant used in the present invention is preferably one or more selected from the group consisting of polyoxyalkylene fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, alkyl glucosides, sucrose fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene hydrogenated castor oil, alkyl saccharides, alkylamine oxides, alkylamidoamine oxides, and polyether-modified silicones, from the viewpoint of obtaining good emulsification stability. The content of the nonionic surfactant in the emulsified cosmetic of the present invention is preferably 0.03% by mass or more and 1% by mass or less, more preferably 0.05% by mass or more and 0.7% by mass or less, even more preferably 0.1% by mass or more and 0.5% by mass or less, and even more preferably 0.1% by mass or more and 0.3% by mass or less, from the viewpoint of obtaining good emulsification stability. When polyether-modified silicone is used as the nonionic surfactant, its content is preferably less than 0.01% by mass, from the viewpoint of preventing deterioration of skin compatibility when applied.

[0049] Examples of alcohols include one or more selected from the group consisting of monohydric alcohols and polyhydric alcohols. Examples of monohydric alcohols include saturated monohydric alcohols with 2 to 4 carbon atoms, such as ethanol, propanol, isopropanol, and t-butyl alcohol. Examples of polyhydric alcohols include dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight less than 650), 1,2-propanediol (propylene glycol), 1,3-propanediol (propanediol), dipropylene glycol, polypropylene glycol (average molecular weight less than 650), 1,3-butanediol (1,3-butylene glycol), and polybutylene glycol (average molecular weight less than 650); and trihydric alcohols such as glycerin, diglycerin, and polyglycerin.

[0050] From the viewpoint of obtaining an emulsified cosmetic composition of the present invention that has a fluffy, mousse-like form and provides a good feel and good spreadability when applied to the skin, the viscosity at 25°C is preferably 60,000 mPa·s or more and 150,000 mPa·s or less. More specifically, by setting the viscosity to 60,000 mPa·s or more, a fluffy, mousse-like form is obtained, and when applied to the skin, it spreads well and provides a good feel. Furthermore, from the viewpoint of making the composition easy to dispense from the container and obtaining good usability, the viscosity is more preferably 60,000 to 120,000 mPa·s, and even more preferably 70,000 to 100,000 mPa·s.

[0051] The cosmetic composition of the present invention is an emulsified cosmetic composition that, when dispensed from a container, has a fluffy, mousse-like form. Figure 1 shows the state when dispensed from the container. When such a mousse-like emulsified cosmetic composition is applied to the skin, it has a good feel and spreads well. If an ultraviolet absorber is incorporated into the emulsified cosmetic composition of the present invention, it will have a good feel and spread well when applied to the skin, and the ultraviolet absorber will be applied uniformly to the skin, resulting in excellent ultraviolet protection and a good feel.

[0052] The present invention provides a method for producing an emulsified cosmetic, which is not particularly limited, but is preferably a method for producing an emulsified cosmetic, which comprises: (1) a step of producing an aqueous phase containing polyethylene glycol having an average molecular weight of 1540 or more and 10000 or less and being solid at 25°C; (2) a step of mixing an oily component with the obtained aqueous phase to obtain an emulsified composition; and (3) a step of adding (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times or more its own weight to the obtained emulsified composition. The method provides a method for producing an emulsified cosmetic, which contains (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times or more its own weight, and (B) polyethylene glycol having an average molecular weight of 1540 or more and being solid at 25°C, and having a viscosity of 60000 mPa·s or more and 150000 mPa·s or less at 25°C. More specifically, for example, an oily composition in which an ultraviolet absorber or the like has been heated and is in a molten state is added to an aqueous phase containing polyethylene glycol. Furthermore, the agar hydrogel particles may be pre-dispersed in the aqueous composition, or they may be added to the aqueous phase after emulsification. It is also preferable to add the superabsorbent polymer to the aqueous phase after emulsification. The oily components used here include (D) the ultraviolet absorber and (E) the oil, etc.

[0053] With respect to the embodiments described above, the present invention further discloses the following cosmetic composition: <1> The following components (A) and (B): (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more; (B) an emulsified cosmetic composition containing polyethylene glycol that is solid at 25°C and has an average molecular weight of 1540 to 10000, and has a viscosity of 60000 mPa·s to 150000 mPa·s at 25°C. <2> The emulsified cosmetic composition according to <1>, wherein component (A) is preferably a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 100 times its own weight or more, and more preferably a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 200 times its own weight or more. <3> The emulsified cosmetic composition according to <1> or <2>, wherein component (A) is one or more selected from polyacrylic acid or its salts and polyacrylic acid-based polymers, preferably one or more selected from polyacrylic acid or its salts, sodium polyacrylate graft starch, (sodium polyacrylate / PEG-9 diacrylate) crosspolymer, and sodium carbomer. <4> The emulsified cosmetic composition according to any one of <1> to <3>, wherein component (A) is one or more selected from sodium polyacrylate and polyacrylic acid-based polymers having a crosslinked structure in their molecular structure. <5> The emulsified cosmetic composition according to any one of <1> to <4>, wherein component (A) is preferably one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 4500 mPa·s or more in a 0.5% by mass aqueous solution, more preferably one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 5000 mPa·s or more in a 0.5% by mass aqueous solution, and even more preferably one or more selected from sodium polyacrylate and polyacrylic acid polymers having a viscosity of 6000 mPa·s or more in a 0.5% by mass aqueous solution. <6> The emulsified cosmetic composition according to any one of <1> to <5>, wherein the content of component (A) is preferably 0.1% by mass or more and 2% by mass or less, more preferably 0.2% by mass or more and 1% by mass or less, and even more preferably 0.3% by mass or more and 0.6% by mass or less. <7> The emulsified cosmetic composition according to any one of <1> to <6>, wherein the content of component (B) is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.3% by mass or more and 3% by mass or less, and even more preferably 0.5% by mass or more and 2% by mass or less.<8> The emulsified cosmetic composition according to any one of <1> to <7>, further comprising (C) agar hydrogel particles. <9> The emulsified cosmetic composition according to <8>, wherein component (C) has an agar concentration in the range of 0.5 to 2.0% by mass, an average particle diameter in the range of 1 to 1000 μm, more preferably in the range of 30 to 400 μm, and even more preferably in the range of 50 to 250 μm. <10> The emulsified cosmetic composition according to <8> or <9>, wherein the content of component (C) is preferably 10% by mass or more and 80% by mass or less, more preferably 20% by mass or more and 70% by mass or less, and even more preferably 30% by mass or more and 65% by mass or less. <11> The emulsified cosmetic composition according to any one of <8> to <10>, wherein the mass ratio of component (C) to component (B) ((C) / (B)) is preferably 0.01 or more and 5 or less, more preferably 0.03 or more and 3 or less, and even more preferably 0.05 or more and 2 or less. <12> An emulsified cosmetic composition according to any one of <1> to <11>, wherein the viscosity at 25°C is preferably 60,000 to 120,000 mPa·s, and more preferably 70,000 to 100,000 mPa·s. <13> An emulsified cosmetic composition according to any one of <1> to <12>, wherein the average molecular weight of component (B) is preferably 1,540 or more and 10,000 or less, and more preferably 4,000 or more and 6,000 or less. <14> An emulsified cosmetic composition according to any one of <1> to <13>, wherein the content of an associative thickener having a polyoxyethylene chain is less than 0.1% by mass. <15> An emulsified cosmetic composition according to any one of <1> to <14>, further containing one or more selected from water, an ultraviolet absorber, an oil, and a nonionic surfactant. <16> An emulsified cosmetic composition according to <15>, wherein the content of polyether-modified silicone as a nonionic surfactant is less than 0.01% by mass. <17> The emulsified cosmetic composition according to <15>, wherein the ester oil (including ultraviolet absorber) content is 5% by mass or more and 25% by mass or less.<18> A method for producing an emulsified cosmetic, comprising the steps of: (1) producing an aqueous phase containing polyethylene glycol having an average molecular weight of 1540 or more and 10000 or less, which is solid at 25°C; (2) mixing an oily component with the obtained aqueous phase to obtain an emulsified composition; and (3) adding (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more to the obtained emulsified composition, wherein the emulsified cosmetic contains (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more, and (B) polyethylene glycol having an average molecular weight of 1540 or more and 10000 or less, which is solid at 25°C, and has a viscosity of 60000 mPa·s or more and 150000 mPa·s or less at 25°C.

[0054] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0055] Examples 1-16 and Comparative Examples 1-4: Emulsified cosmetics shown in Tables 1-4 were prepared, and the viscosity of the cosmetics was measured to evaluate the fluffy feel, spreadability, and the presence or absence of unevenness or residue during application. The evaluation results are also shown in Tables 1-4.

[0056] (Manufacturing Method) Polyethylene glycol and an emulsifying thickener were pre-dispersed in a polyhydric alcohol and then added to the aqueous phase, stirred with a propeller mixer, and uniformly dissolved. The powder was then added to the aqueous phase. An oil that had been heated and dissolved (80°C) was added and emulsified by homogenization (room temperature 25°C, 8000 r / min). Subsequently, a water-absorbing polymer that was pre-dispersed in a polyhydric alcohol and was solid at 25°C was added, and the mixture was homogenized again (room temperature 25°C, 12000 r / min) to obtain the desired cosmetic composition.

[0057] (Viscosity Measurement) Under room temperature (25°C), the viscosity of the undiluted sample was measured using a viscometer (Toki Sangyo, VISCOMETER TVB-10R). Measurement conditions: 25°C, T-type spindle, C-type, 5 r / min, 60 seconds

[0058] (Soft and fluffy texture) For each sample, three cosmetic evaluation panel members applied 2 mg / cm² to the skin. 2The samples were applied, and the fluffy feel of the cosmetic during application was evaluated on a 5-point scale according to the evaluation criteria below. For each sample, the average of the total scores from all panel members was used to determine the final score according to the 5-point judgment criteria below. <Evaluation Criteria> 5: Very fluffy 4: Fluffy 3: Neither fluffy nor soft 2: Not very fluffy 1: Not fluffy <Judgment Criteria> A: 4 points or higher B: 3.5 points or higher but less than 4 points C: 3 points or higher but less than 3.5 points D: 2 points or higher but less than 3 points E: Less than 2 points A score of C or higher is considered a pass.

[0059] (Spreadability) For each sample, three cosmetic evaluation panel members applied 2 mg / cm² to the skin. 2 The product was applied to the skin, and the feel of the cosmetic when spread on the skin was evaluated on a 5-point scale according to the evaluation criteria below. For each sample, the average of the total scores from all panel members was used to determine the final score on a 5-point scale below. <Evaluation Criteria> 5: Spreads very well 4: Spreads well 3: Neither good nor bad 2: Does not spread very well 1: Does not spread well <Judgment Criteria> A: 4 points or more B: 3.5 points or more but less than 4 points C: 3 points or more but less than 3.5 points D: 2 points or more but less than 3 points E: Less than 2 points A score of C or higher is considered a pass.

[0060] (Wrinkling and residue formation) Each sample was added to artificial leather (Laforet black leather) at a concentration of 2 mg / cm². 2 It was applied and allowed to dry for 15 minutes. Afterwards, powder foundation (Primavista Double Effect Powder Ochre 07 (Kao Corporation)) was applied over the makeup at a rate of 0.6 mg / cm². 2 The sample was placed on a surface, and a back-and-forth motion was repeated 10 times while applying pressure with the pad of a finger. The test was conducted to check whether the coating film wrinkled or produced any residue (see Figure 2). A: No change in the condition of the coating film after rubbing with a finger. B: Some change after rubbing with a finger, but not noticeable. C: Some wrinkles in the coating film after rubbing with a finger, but no residue is produced. D: Some wrinkles in the coating film and a small amount of residue are produced after rubbing with a finger. E: Some wrinkles in the coating film and residue is produced after rubbing with a finger. C or higher is considered acceptable.

[0061]

[0062]

[0063]

[0064]

[0065] An emulsified cosmetic formulation was manufactured according to the following formula: Sodium polyacrylate grafted starch (MAKIMOUSSE12) 0.4% by mass PEG-75 (PEG4000) 1% by mass Ethylhexyl salicylate (PARSOL EHS) 4% by mass Homosalate (PARSOL HMS) 7% by mass t-Butyl methoxydibenzoylmethane (PARSOL 1789) 3% by mass Octocrylene (PARSOL 340) 3% by mass Diethylhexyl naphthalene dicarboxylate (SOLAFRESH) 2% by mass Dextrin palmitate (Leopal KL2) 1% by mass Glyceryl behenate (SUNSOFT NO.8100-C) 1% by mass Dimethicone (Silicone KF-96A-10CS) 1% by mass (Acryloyldimethyltaurate ammonium / VP) copolymer (ARISTOFLEX AVC) 1% by mass, 1,3-Butylene glycol (1,3-BG) 2% by mass, Polyoxyethylene coconut oil fatty acid sorbitan (RHEODOL TW-L120) 1% by mass, Purified water 72.6% by mass

Claims

1. The following components (A) and (B): (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more; (B) an emulsified cosmetic containing polyethylene glycol that is solid at 25°C and has an average molecular weight of 1540 to 10000, with a viscosity of 60000 mPa·s to 150000 mPa·s at 25°C.

2. The emulsified cosmetic composition according to claim 1, wherein component (A) is a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 100 times its own weight or more.

3. The emulsified cosmetic composition according to claim 1 or 2, wherein component (A) is one or more selected from sodium polyacrylate and polyacrylic acid-based polymers having a crosslinked structure in their molecular structure.

4. The emulsified cosmetic composition according to any one of claims 1 to 3, wherein component (A) is one or more selected from sodium polyacrylate and polyacrylic acid-based polymers, the viscosity of a 0.5% by mass aqueous solution being 6000 mPa·s or more.

5. The emulsified cosmetic composition according to any one of claims 1 to 4, wherein the average molecular weight of component (B) is 4000 or more and 6000 or less.

6. The emulsified cosmetic composition according to any one of claims 1 to 5, wherein the content of component (B) is 0.1% by mass or more and 5% by mass or less.

7. An emulsified cosmetic composition according to any one of claims 1 to 6, wherein the viscosity at 25°C is 60,000 to 120,000 mPa·s.

8. An emulsified cosmetic composition according to any one of claims 1 to 7, wherein the content of an associative thickener having a polyoxyethylene chain is less than 0.1% by mass.

9. The emulsified cosmetic composition according to any one of claims 1 to 8, further comprising one or more selected from water, an ultraviolet absorber, an oil, and a nonionic surfactant.

10. The emulsified cosmetic composition according to claim 9, wherein the content of polyether-modified silicone as a nonionic surfactant is less than 0.01% by mass.

11. The emulsified cosmetic composition according to claim 9, wherein the content of ester oil (including ultraviolet absorber) is 5% by mass or more and 25% by mass or less.

12. A method for producing an emulsified cosmetic, comprising the steps of: (B) producing an aqueous phase containing polyethylene glycol having an average molecular weight of 1540 or more and being solid at 25°C; mixing an oily component with the obtained aqueous phase to obtain an emulsified composition; and adding (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more to the obtained emulsified composition to obtain an emulsified cosmetic, wherein the emulsified cosmetic contains (A) a water-absorbing polymer that is solid at 25°C and has a water absorption ratio of 50 times its own weight or more, and (B) polyethylene glycol having an average molecular weight of 1540 or more and being solid at 25°C, and having a viscosity of 60,000 mPa·s or more and 150,000 mPa·s or less at 25°C.

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