Emulsion cosmetic

Abstract

The present invention relates to an emulsion cosmetic which contains the following components (A) and (B): (A) a water-absorbing polymer that is in a solid form at 25°C and has a water absorption ratio of 50 times or more the weight of the water-absorbing polymer itself; and (B) agar hydrogel particles. The emulsion cosmetic has a viscosity at 25°C of 50,000 mPa·s to 150,000 mPa·s inclusive.

Description

Emulsified cosmetics

[0001] This invention relates to emulsified cosmetic compositions.

[0002] Cosmetics containing a superabsorbent polymer such as sodium polyacrylate and a microgel obtained by crushing a cross-linked water-swellable polymer or hydrophilic compound gel are known to be rich and full-bodied, without stringiness, and possessing a refreshing feel, good spreadability, and non-stickiness (Reference 1). (Reference 1) International Publication No. 2019 / 131845

[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) agar hydrogel particles, wherein the viscosity at 25°C is 50,000 mPa·s or more and 150,000 mPa·s or less.

[0004] This is a photograph showing the state of the emulsified cosmetic composition of the present invention when it is dispensed from the container. 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 emulsified cosmetics are known for their richness and body, lack of stringiness, refreshing feel, good spreadability, and non-stickiness, but they typically come in the form of ordinary serums and lotions. What is desired is an emulsified cosmetic that is not in the form of ordinary serums and lotions like conventional products, but rather in a light, fluffy mousse-like form that, when applied to the skin, instantly disintegrates with a light touch, blends and melts into the skin in an instant, and has good spreadability.

[0007] As a result of various studies to solve the above-mentioned problems, the present inventors have found that by combining a water-absorbing polymer that is solid at 25°C and has a high water absorption ratio with agar hydrogel particles to create an emulsion composition with a certain level of viscosity, it is possible to obtain a novel emulsion cosmetic that has a fluffy, mousse-like form and instantly breaks down when applied to the skin, resulting in a good feel and good spreadability.

[0008] The emulsified cosmetic of the present invention has a fluffy, mousse-like form, and when applied to the skin, the mousse-like form instantly collapses, resulting in a novel cosmetic with a pleasant feel and good spreadability.

[0009] The present invention is an emulsified cosmetic composition, one form thereof comprising 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) agar hydrogel particles, and an emulsified cosmetic composition having a viscosity of 50,000 mPa·s or more and 150,000 mPa·s or less at 25°C. The components and their contents of the cosmetic composition of the present invention 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 a certain number of times its own weight in water" (water absorption ratio), 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 this is desirable for obtaining an emulsified cosmetic that has a fluffy mousse-like form and instantly breaks down into a mousse-like form when applied to the skin, resulting in a good feel and good spreadability. Here, "solid state" refers to a state that does not possess fluidity.

[0011] Examples of such superabsorbent polymers 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 acid-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), in order to obtain an emulsified cosmetic that has a fluffy mousse-like form and instantly breaks down into a mousse-like form when applied to the skin, providing a good feel and good spreadability, it is preferable to select one or more from sodium polyacrylate and polyacrylic acid polymers having a crosslinked structure in their molecular structure, from the viewpoint of maintaining the shape retention of the formulation. Specifically, it is preferable to use 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, it is preferable to use a sodium salt. 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), from the viewpoint of maintaining the shape retention of the formulation, it is preferable that one or more selected from sodium polyacrylate and polyacrylic acid polymers have 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 have 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 have a viscosity of 6000 mPa·s or more in a 0.5% by mass aqueous solution. 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). Examples of commercially available products containing such component (A) include MAKIMOUSSE12 (Daito Chemical), AQUPEC MG N40R (Sumitomo Chemical), AQUA KEEP (Sumitomo Chemical), Cosmedia (Bas), and Covacryl MV60 (Sensient).

[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 50,000 mPa·s or more for the emulsified composition and a fluffy feel. Furthermore, from the viewpoint of preventing the generation of polymer-derived clumping and residue, 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 present invention is agar hydrogel particles. The agar hydrogel particles are 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 usability, 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.

[0015] 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 of 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 considered to be 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 cm².2 The 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.

[0016] 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 whose mousse-like form instantly collapses when applied to the skin, resulting in a good feel and good spreadability, the particle size is preferably in the range of 0.5 to 2.0% by mass, with an average particle size 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.

[0017] The content of component (B) 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.

[0018] The emulsified cosmetic composition of the present invention preferably further contains (C) polyethylene glycol having an average molecular weight of 1540 to 10000 and being solid at 25°C, in order to prevent the formation of unevenness or residue in the coating film when the cosmetic composition is applied to the skin. The polyethylene glycol used in the present invention has an average molecular weight of 1540 to 10000, and preferably an average molecular weight of 1540 to 80000.

[0019] (C) Examples of polyethylene glycols with an average molecular weight of 1540 or more and 50000 or less include polyethylene glycol 1540 (manufactured by Mitsui Chemicals, Inc.), polyethylene glycol 6000, polyethylene glycol 11000, polyethylene glycol 20000 (manufactured by NOF Corporation), etc.

[0020] The content of component (C) 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 wrinkles and residue formation of the coating film when the cosmetic composition is applied to the skin. Furthermore, the mass ratio of component (B) to component (C) in the emulsified cosmetic composition of the present invention ((B) / (C)) is preferably 0.01 to 5, more preferably 0.03 to 3, and even more preferably 0.05 to 2, from the viewpoint of preventing wrinkles and residue formation of the coating film when the cosmetic composition is applied to the skin.

[0021] In addition to the above-mentioned components, the emulsified cosmetic composition of the present invention may contain water, ultraviolet absorbers, ultraviolet scattering agents, spherical powders, oils, nonionic surfactants, moisturizing ingredients, alcohols, water-soluble polymers, neutralizing agents, pH adjusters, bactericides, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, 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 (D) UV absorber in the emulsified cosmetic composition 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 even more preferably 5% by mass or more and 20% by mass or less, from the viewpoint of improving the UV protection effect and improving the spreadability of the cosmetic composition.

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

[0030] Examples of ester oils include synthetic ester oils and natural oils and fats. For example, esters of monocarboxylic acids and monohydric alcohols, esters of monocarboxylic acids and polyhydric alcohols, and esters of polyhydric acids and monohydric alcohols are examples. Examples of esters of monocarboxylic acids and monohydric alcohols include esters represented by the following general formula (1).

[0031]

[0032] (In general formula (1), R 1 represents an alkyl group or an alkenyl group which may be substituted with a hydroxyl group, having 1 to 25 carbon atoms and being linear or branched, or an aromatic-containing hydrocarbon group having 6 to 24 carbon atoms, and R 2 represents an alkyl group or an alkenyl group which is linear or branched and has 1 to 30 carbon atoms.) When R 1 is an alkyl group or an alkenyl group, the number of carbon atoms of R 1 is preferably 7 or more, and is 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 is preferably 22 or less, more preferably 20 or less. The number of carbon atoms of R 2 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 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), and one or more selected from the group consisting of these are mentioned.

[0033] Examples of esters of monocarboxylic acids and monohydric alcohols also include esters represented by the following general formula (2).

[0034]

[0035] (In General Formula (2), R 3 represents an alkyl group or alkenyl group, which may be substituted with a hydroxyl group, having 1 to 25 carbon atoms and being linear or branched, 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 preferably 23 or less, more preferably 21 or less, and still more preferably 19 or less carbon atoms. R 4 is preferably an aromatic-containing hydrocarbon group having 6 or more carbon atoms, and preferably 22 or less, more preferably 20 or less, and still more preferably 18 or less carbon atoms, and even more preferably a benzyl group. The alkyleneoxy group represented by AO is preferably a propyleneoxy group, and n is preferably 1 to 10, more preferably 1 to 5. Specific examples of the ester represented by General Formula (2) include an ester of myristic acid and a 3-mole adduct of propylene oxide with benzyl alcohol (manufactured by Croda: Crodamol STS), an ester of 2-ethylhexanoic acid and a 3-mole adduct of propylene oxide with benzyl alcohol (manufactured by Croda: Crodamol SFX), and the like.

[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 represents a polyhydric alcohol residue, preferably a hydrocarbon group having 2 to 10 carbon atoms, R6 represents a monocarboxylic acid residue having 1 to 25 carbon atoms, and p represents an integer of 2 to 10.) Note that R 5The 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. 6 The 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 having 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. 8The 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 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.

[0047] 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.

[0048] 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.

[0049] The viscosity of the emulsified cosmetic composition of the present invention at 25°C is preferably 50,000 mPa·s to 150,000 mPa·s, from the viewpoint of obtaining an emulsified cosmetic composition that has a fluffy, mousse-like form and instantly breaks down when applied to the skin, resulting in a good feel and good spreadability. More specifically, if the viscosity is 50,000 mPa·s or higher, the fluffy, mousse-like form will not be achieved, and the mousse-like form will not instantly break down when applied to the skin, resulting in a poor feel. Also, if the viscosity is too high, the composition will be difficult to dispense from the container, and good usability will not be achieved. The viscosity is more preferably 60,000 to 120,000 mPa·s, and even more preferably 70,000 to 100,000 mPa·s.

[0050] 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, the mousse-like form instantly collapses, resulting in a pleasant feel and good spreadability. If an ultraviolet absorber is incorporated into the emulsified cosmetic composition of the present invention, the mousse-like form instantly collapses when applied to the skin, resulting in a pleasant feel and good spreadability. As a result, the ultraviolet absorber is uniformly applied to the skin, providing excellent ultraviolet protection and a pleasant feel.

[0051] The method for producing the emulsified cosmetic of the present invention is not particularly limited, but for example, an oily composition in which an ultraviolet absorber or the like has been heated and melted is added to an aqueous phase containing an aqueous composition. Agar hydrogel particles may be dispersed in the aqueous composition beforehand, or they may be added to the aqueous phase after emulsification. Furthermore, it is preferable to add the superabsorbent polymer to the aqueous phase after emulsification.

[0052] With respect to the embodiments described above, the present invention further discloses the following cosmetic composition: <1> 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) agar hydrogel particles, wherein the viscosity at 25°C is 50,000 mPa·s or more and 150,000 mPa·s or less. <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, more preferably 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 component (B) has an agar concentration in the range of 0.5 to 2.0% by mass, an average particle size 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.<8> An emulsified cosmetic composition according to any one of <1> to <7>, wherein the content of component (B) 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. <9> An emulsified cosmetic composition according to any one of <1> to <7>, further containing (C) polyethylene glycol having an average molecular weight of 1540 or more and 10000 or less, and being solid at 25°C. <10> An emulsified cosmetic composition according to any one of <1> to <7>, wherein the content of component (C) 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. <11> An emulsified cosmetic composition according to any one of <1> to <7>, wherein the mass ratio of component (B) to component (C) ((B) / (C)) 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 <7>, further comprising one or more selected from water, a UV absorber, an oil, and a nonionic surfactant.

[0053] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0054] Examples 1-16 and Comparative Examples 1-2: Emulsified cosmetics as shown in Tables 1-3 were prepared, and the viscosity of the cosmetics was measured to evaluate their ability to maintain a fluffy, mousse-like shape, their soft feel, and their spreadability. The evaluation results are also shown in Tables 1-3.

[0055] Agar hydrogel particles A-C: Agar (1.5%) was first uniformly dissolved in 80°C water in a preliminary tank by paddle stirring. A dispersion liquid, maintained at 80°C, was supplied to a dispersion spray line equipped with a two-fluid nozzle (nozzle model number: SUE45B, manufactured by Spraying Systems Co., Ltd.) as a spray nozzle in a spray tank. Hydrogel particles A-C were produced by spraying the dispersion liquid from the two-fluid nozzle into the atmospheric phase in the spray tank to form droplets, and then cooling and solidifying the continuous phase aqueous solution in the dispersion liquid droplets.

[0056] Agar hydrogel particles D were prepared by uniformly dissolving 1.5% agar in 80°C water using propeller stirring. The resulting agar aqueous solution was then heated and cooled to room temperature while being homogenized (4000 r / min) to produce agar hydrogel particles D.

[0057] (Manufacturing Method) Examples 1-14, 16 Comparative Examples 2-5 Agar hydrogel particles were dispersed in water using a propeller mixer, and a water-absorbing polymer pre-dispersed with polyhydric alcohol was added thereto. The mixture was then homogenized to obtain the specified cosmetic composition.

[0058] Example 15 An oil-free agar hydrogel obtained by the method described above for crushing agar hydrogel was dispersed in water using a propeller mixer, and a water-absorbing polymer pre-dispersed with polyhydric alcohol was added thereto, and the mixture was homogenized to obtain a predetermined cosmetic composition.

[0059] Comparative Example 1: Agar powder was added to a mixture stirred with a propeller mixer (250 r / min) and the temperature was raised to 90°C to achieve uniform dissolution. Then, while stirring with the propeller mixer, the mixture was cooled to room temperature, and a water-absorbing polymer pre-dispersed with a polyhydric alcohol was added. The mixture was then homogenized to obtain the desired cosmetic composition.

[0060] (Viscosity Measurement) Under room temperature, 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

[0061] (Shape Retention) The evaluation was based on whether the cosmetic product could maintain its shape and form well-defined pleats after being dispensed using a container with a star-shaped nozzle. A: Forms beautiful pleats while maintaining its shape for 20 seconds or more B: Forms thin pleats while maintaining its shape for 20 seconds or more C: Forms very thin pleats while maintaining its shape for 20 seconds or more D: Maintains its shape immediately after dispensing but deforms within 20 seconds E: Does not maintain its shape immediately after dispensing and spreads out. A rating of C or higher is considered a passing grade.

[0062] (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 cosmetics 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 on a 5-point scale 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 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

[0063] (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

[0064]

[0065]

[0066]

Claims

1. The following components (A) and (B): (A) an absorbent 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 agar hydrogel particles and having a viscosity of 50,000 mPa·s or more and 150,000 mPa·s or less 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 4500 mPa·s or more.

5. The emulsified cosmetic composition according to any one of claims 1 to 4, wherein component (B) is agar hydrogel particles having an agar concentration in the range of 0.5 to 2.0% by mass and an average particle size in the range of 1 to 1000 μm.

6. An emulsified cosmetic composition according to any one of claims 1 to 5, wherein the content of component (A) is 0.1% by mass or more and 2% by mass or less, and the content of component (B) is 10% by mass or more and 80% by mass or less.

7. The emulsified cosmetic composition according to any one of claims 1 to 6, further comprising (C) polyethylene glycol having an average molecular weight of 1540 or more and 10000 or less, which is solid at 25°C.

8. The emulsified cosmetic composition according to any one of claims 1 to 7, further comprising one or more selected from water, an ultraviolet absorber, an oil, and a nonionic surfactant.

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