Cosmetic and urethane foam

Abstract

To provide a urethane foam for impregnation with a cosmetic composition containing a metal element such as zinc, the urethane foam enabling suppression of deterioration in elasticity even upon impregnation with the cosmetic composition, and also to provide a cosmetic product using the urethane foam.SOLUTION: The present invention provides a cosmetic product that has a cosmetic composition and a polycarbonate-based urethane foam impregnated with the cosmetic composition. The present invention further provides a polycarbonate-based urethane foam for impregnation with a cosmetic composition. The cosmetic composition preferably includes at least one metal element selected from among zinc, iron, and copper.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a cosmetic comprising a cosmetic composition and a urethane foam impregnated with the cosmetic composition, and a urethane foam for impregnating a cosmetic composition.

Background Art

[0002] A compact liquid foundation system called "cushion foundation" appeared in South Korea in 2008 and has spread to the world market. This system includes a cosmetic composition such as a liquid foundation and is provided with a foam ("foam") placed in a container as a carrier. Such a compact cosmetic composition impregnation system is convenient to carry and easy to apply to the skin. Patent Document 1 proposes a compact liquid foundation system that uses a urethane foam as a carrier for impregnating an ultraviolet blocking composition. On the other hand, in the field of cosmetic sponges, as described in Patent Document 2, it is common to use a foam containing a large amount of polyester-based urethane.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when a polyester-based polyurethane foam is stored in a state of being impregnated with a cosmetic composition containing a metal element such as zinc, it has been found that the elasticity of the foam decreases over time, and in some cases, deterioration may occur until appearance abnormalities occur. In particular, the foam is likely to deteriorate when stored under high temperature and high humidity conditions.

Means for Solving the Problems

[0005] The present inventor has intensively studied the above phenomenon. As a result, it has been found that when a polycarbonate-based urethane foam is used, it has extremely excellent durability against a cosmetic composition containing a metal element such as zinc, and the present invention has been completed.

[0006] The present invention is based on the above findings, and provides a cosmetic having a cosmetic composition and a polycarbonate-based urethane foam impregnated with the cosmetic composition.

[0007] The present invention also provides a polycarbonate-based urethane foam for impregnating a cosmetic composition.

Effects of the Invention

[0008] According to the present invention, even when a urethane foam is impregnated with a cosmetic composition containing a metal element such as zinc, deterioration of the urethane foam can be effectively suppressed.

Brief Description of the Drawings

[0009]

Figure 1

Modes for Carrying Out the Invention

[0010] Hereinafter, the present invention will be described based on preferred embodiments. The inventor of the present invention has intensively studied the reason why conventional urethane foams are likely to deteriorate over time with respect to cosmetic compositions containing metal elements such as zinc, and made the following speculation. As described above, as the conventional cosmetic urethane foam, a foamed polyester-based polyurethane is generally used. When a polyester-based urethane foam coexists with a specific metal element such as zinc or a compound thereof, it is considered that the metal cation acts on the carbonyl group of the ester bond in the polyester structure to promote the hydrolysis reaction. On the other hand, in the present invention, a polycarbonate-based polyurethane foam is used, and since the ester bond in the chemical structure of the foam is significantly reduced compared to the polyester-based polyurethane foam, it is considered that the action of specific metal elements such as zinc can be avoided.

[0011] In this specification, "urethane foam" also means polyurethane sponge, and means a solidified product after foaming polyurethane.

[0012] The urethane foam used in the present invention is a foam obtained by foaming a polycarbonate-based polyurethane. Thereby, even when a cosmetic composition containing a metal element such as zinc is impregnated and stored under high temperature and high humidity, the decrease in the elasticity of the foam is suppressed and it becomes stable over time, and the appearance deterioration of the urethane foam is suppressed.

[0013] In the present invention, as the polyurethane used as the raw material for foaming the polycarbonate-based polyurethane foam, in addition to the polycarbonate-based polyurethane, a polyester-based polyurethane or a polyether-based polyurethane may be used. In the present invention, the polycarbonate-based polyurethane foam used in cosmetics is such that the proportion of the polycarbonate-based polyurethane in the polyurethane used as the raw material for foaming accounts for 60% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, particularly preferably 90% by mass or more, and most preferably 100% by mass.

[0014] In the present invention, the polycarbonate-based polyurethane is obtained by reacting a polyol component composed of a polycarbonate polyol and a chain extender with a polyisocyanate compound.

[0015] The polycarbonate polyol has terminal active hydrogen with a molecular weight of 500 or more and 4,000 or less. The polycarbonate-based polyurethane is preferably one using 90% by mass or more of the polycarbonate polyol as the polymer polyol within the above molecular weight range, more preferably one using 95% by mass or more, and most preferably one using only the polycarbonate polyol.

[0016] The polycarbonate polyol is preferably a component represented by the following formula (i). HO-R’-(O-C(O)-O-R)Y-OH···(i)

[0017] In formula (i), R is a saturated aliphatic diol residue having 1 to 12 carbon atoms, Y represents the number of repeating units of the molecule and is an integer of 1 or more. R’ is an organic group having 1 to 6 carbon atoms. These can be obtained by a transesterification method of reacting a saturated aliphatic diol with a substituted carbonate (such as diethyl carbonate, diphenyl carbonate, etc.) under conditions where the hydroxyl group is in excess, reacting the saturated aliphatic diol with phosgene, or, if necessary, further reacting with a saturated aliphatic diol thereafter.

[0018] Examples of the chain extender include dihydric alcohols such as ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,3-propanediol, etc., and it is preferable to use ethylene glycol or 1,4-butanediol.

[0019] Examples of the polyisocyanate compound include aromatic isocyanates such as methylene diphenyl diisocyanate, tolylene diisocyanate, xylylene diisocyanate, naphthylene 1,5 - diisocyanate, and tetramethylene xylylene diisocyanate; alicyclic isocyanates such as isophorone diisocyanate and dicyclohexylmethane diisocyanate; and aliphatic isocyanates such as hexamethylene diisocyanate, dimer acid diisocyanate, and norbornene diisocyanate, etc.

[0020] In the present invention, the "urethane foam for impregnating a cosmetic composition" means that it is used in a cosmetic obtained by impregnating a urethane foam with a cosmetic composition.

[0021] The carrier impregnated with the cosmetic composition used in the cosmetic of the present invention may contain 80% by mass or more, 85% by mass or more, 90% by mass or more, 93% by mass or more, 95% by mass or more, 97% by mass or more, 98% by mass or more, 99% by mass or more, or 100% by mass of polycarbonate - based polyurethane foam based on the total weight of the carrier.

[0022] In this specification, the "carrier" means a substance impregnated with a cosmetic composition and carrying the cosmetic composition, and may sometimes be expressed as an "impregnated body". Further, the "carrier" may be used to discharge the cosmetic composition supported thereon to a separate applicator.

[0023] As described above, when using a polycarbonate - based urethane foam, the durability under high humidity and high temperature in the presence of a specific metal element is improved. When the physical properties of the urethane foam are made to be predetermined, excellent impregnation properties and discharge properties of the cosmetic composition can be obtained while having such durability, which is preferable because of its excellent usability.

[0024] In this specification, the polycarbonate-based polyurethane foam is preferably a wet urethane foam. "Urethane foam" is classified into "wet urethane foam" and "dry urethane foam". In this specification, "wet urethane foam" means a porous body obtained by solidifying a mixture of polyurethane dissolved in a solvent such as dimethylformamide and a water-soluble pore-forming agent in a coagulation liquid into a desired shape and then eluting the pore-forming agent. On the other hand, "dry urethane sponge" means a foam obtained by mixing a compound that gasifies by heat or the like in the polymerization process of a urethane resin or using carbon dioxide gas generated from the reaction of isocyanate and water as a foaming agent.

[0025] When the polycarbonate-based polyurethane foam of the present invention is a wet urethane foam, it is easy to form the foam (sponge) into one having a "continuous pore structure", and it is easy to improve the impregnation property and drainage property of the cosmetic composition, and it is easy to improve the usability. The above-mentioned pores refer to the space where the pore-forming agent has been eluted (hereinafter also referred to as "cell"). "Continuous pore structure" means a structure in which the pores (cells) communicate with each other. On the other hand, "closed pore structure" refers to a structure in which each cell is independent and isolated from others. Whether it is a "continuous pore structure" or a "closed pore structure" can be confirmed by observing the cross section of the urethane foam under an electron microscope.

[0026] The elongation at break of the polycarbonate-based urethane foam depends on the porosity and pore structure in the foam. Therefore, it is easy to control the impregnation property and drainage property of the cosmetic composition by setting the elongation at break within a certain range. Specifically, the elongation at break of the polycarbonate-based urethane foam is preferably 300% or less, more preferably 240% or less, and particularly preferably 235% or less. By setting the elongation at break to a certain value or less, the resilience when used as a carrier is good, the feeling of use of the cushion is easy to be good, the impregnation property and drainage property of the cosmetic composition are also easy to be good, and the usability is easy to be improved. In addition, in the present invention, the elongation at break of the polycarbonate-based urethane foam is preferably 150% or more, more preferably 180% or more. By having an elongation at break of a certain level or more, excellent extensibility can be obtained as a carrier for the cosmetic composition, the usability of the cushion can be improved, and it is possible to prevent the drainage property from becoming too large. For these reasons, by setting the elongation at break to be not less than the above lower limit and not more than the above upper limit, in addition to the usability of the cushion, it is easy to make the impregnation property and drainage property of the cosmetic composition excellent. Therefore, when the polycarbonate-based polyurethane foam is pressed with a puff or the like, the amount of the cosmetic composition adhering to the puff or the like can be made appropriate, and the skin loading and skin elongation of the cosmetic composition can be improved, thereby improving the usability. The elongation at break of the polycarbonate-based urethane foam is measured at 23 ± 2°C in a state where it is not impregnated with the cosmetic composition and is measured in accordance with JIS K 6400-5.

[0027] Also, for example, the polycarbonate-based urethane foam used in the present invention can control the impregnation property and the drainage property by the tensile strength. Specifically described, since the tensile strength reflects the pore structure and porosity in the foam, the impregnation property and the drainage property can be adjusted by setting this within a certain range. Specifically, the polycarbonate-based urethane foam preferably has a tensile strength of 45 N / cm 2 or less, particularly preferably 30 N / cm 2 or less, and especially preferably 28 N / cm 2 or less. By having a tensile strength of a certain level or less, it is easy to improve the impregnation property and the drainage property. Also, the tensile strength of the polycarbonate-based urethane foam is preferably 10 N / cm 2 or more, and preferably 20 N / cm 2It is more preferable that it is as described above. When the tensile strength is a certain level or higher, good strength as a carrier of the cosmetic composition can be obtained, and it becomes easy to use. Also, the discharge property of the polycarbonate-based polyurethane foam tends to be appropriate. From these points, when the tensile strength of the polycarbonate-based polyurethane foam is within the range of the above lower limit and upper limit, when the polycarbonate-based polyurethane foam impregnated with the cosmetic composition is pressed, the amount of the cosmetic composition adhering to the puff etc. tends to be appropriate, and as a result, it is preferable because it tends to facilitate the skin loading and skin stretching of the cosmetic composition. The tensile strength of the polycarbonate-based urethane foam is measured at 23 ± 2 °C in a state where it is not impregnated with the cosmetic composition, and is measured in accordance with JIS K 6400-5.

[0028] In the present invention, the density of the polycarbonate-based urethane foam is 0.15 g / cm 3 It is preferably below, more preferably below 0.12 g / cm 3 and particularly preferably below 0.10 g / cm 3 By setting the density to a certain level or below, the porosity can be increased, and the impregnation property of the cosmetic composition can be easily improved. Also, the polycarbonate-based polyurethane foam preferably has a density of 0.05 g / cm 3 or more, more preferably 0.06 g / cm 3 or more, still more preferably 0.07 g / cm 3 or more, and particularly preferably 0.08 g / cm 3 or more. When the density of the polycarbonate-based polyurethane foam is a certain level or higher, the strength becomes good, the handleability is excellent, and the discharge property of the cosmetic composition tends to be appropriate. From these facts, when the density of the polycarbonate-based polyurethane foam is within the above lower limit and upper limit, it can have sufficient impregnation property with respect to the cosmetic composition, and the discharge rate can be made appropriate, which easily leads to appropriate skin loading and appropriate skin stretching of the cosmetic composition, and the usability can be improved. Here, the density is the apparent density measured at 23 ± 2 °C in a state where it is not impregnated with the cosmetic composition, and is measured in accordance with JIS K 7222.

[0029] It is preferable that the polycarbonate-based urethane foam has 40 pores per inch or more and 130 pores per inch or less, because it is easier to make the impregnation property and the discharge property of the cosmetic composition more suitable. From these viewpoints, it is more preferable that the polycarbonate-based urethane foam has 50 pores per inch or more and 120 pores per inch or less, and it is particularly preferable that it has 70 pores per inch or more and 110 pores per inch or less. Here, the pore count is a value measured from a scanning electron micrograph of the cross section of the urethane foam. That is, a micrograph is taken for a 1-inch range of the polyurethane foam, and the pores within the range where the pore diameter (maximum diameter) on the micrograph is 100 μm or more and 300 μm or less are counted. Pores straddling the inside and outside of the measurement range are calculated as 0.5 pieces. The observation magnification is 50 times.

[0030] In terms of making the impregnation property and the discharge property of the cosmetic composition more suitable, the pore diameter of the polycarbonate-based urethane foam is preferably 100 μm or more and 300 μm or less, more preferably 150 μm or more and 280 μm or less, and particularly preferably 160 μm or more and 270 μm or less. The pore diameter refers to the maximum distance among the distances connecting two points on the outer periphery of the pores visually observed on the micrograph. The pore diameter is the average value measured randomly for 10 or more pores in microscopic observation.

[0031] It is preferable that the polycarbonate-based urethane foam has a hardness of 40 or more and 70 or less according to the Asker F-type hardness meter standard, more preferably has a hardness of 42 or more and 65 or less, and most preferably has a hardness of 42 or more and 60 or less. The polycarbonate-based polyurethane foam having such a hardness can make the feeling of use as a cushion, and the impregnation property and the discharge property of the cosmetic composition more suitable. Here, the hardness is measured at 23 ± 2°C in a state where the cosmetic composition is not impregnated.

[0032] The polycarbonate-based polyurethane foam may have a single-layer structure or a multi-layer structure of two or more layers. Examples of the differences between two layers in a multi-layer structure include differences in density, pore number, pore diameter, etc. For example, when a density difference of two or more layers occurs, the ratio of (density of the high-density layer) / (density of the low-density layer) may be 2 or less, and may be 1.5 or less.

[0033] As a shape suitable for cosmetics such as cushion foundations, the polycarbonate-based polyurethane foam may have a thickness of, for example, 3 mm to 20 mm, 4 mm to 15 mm, or even 7 mm to 11 mm.

[0034] The polycarbonate-based polyurethane foam having the above-mentioned "continuous pore structure", breaking strength and elongation at break, density, pore number, pore diameter, and hardness can be obtained, for example, by kneading a composition mainly composed of a water-solidifying polyurethane, a solvent, and powder particles of a water-soluble inorganic salt to obtain a kneaded product, and then defoaming and molding the obtained kneaded product. The precipitation of the polyurethane due to the replacement of the solvent with water is called water coagulation, and a water-solidifying polyurethane refers to a polyurethane that can be water-coagulated. Generally, polycarbonate-based polyurethane foams are hard and have been exclusively used industrially. However, the inventor has succeeded in developing a polycarbonate-based polyurethane foam suitable for impregnating cosmetic compositions by adjusting the type and amount of the solvent, the particle size and amount of the pore-forming agent, the solid content of the polycarbonate-based polyurethane resin, etc. in the wet method.

[0035] Examples of the water-solidifying polyurethane include those obtained by polymerizing a polyol component composed of the above-mentioned polycarbonate polyol and a chain extender and a polyisocyanate compound in a solvent. As the water-solidifying polyurethane used in the production method of the present invention, a solution having a solid content of 30 ± 5% by mass and a viscosity of 150 to 300 Pa·s (measured value with a No. 6 rotor of a BH-type viscometer at 25°C) is preferably used.

[0036] The solvent used in the production method of the present invention means a good solvent for polyurethane, and usually includes organic solvents such as dimethylformamide, dimethyl sulfoxide, dioxane, tetrahydrofuran, methylpyrrolidone, N-methylpyrrolidone, and mixtures thereof. Among them, dimethylformamide is preferred in view of the ease of obtaining the above physical properties, the ease of elution with water in the subsequent process, the solvent odor as a working environment, flammability, etc. The solvent may also be used to adjust the fluidity of the kneaded product.

[0037] For example, in the case of a polyurethane solution (water-coagulable polyurethane) with a solid content of 30% by mass, the amount of the solvent is preferably added in the range of 5 to 80 parts by mass, more preferably in the range of 20 to 40 parts by mass, based on 100 parts by mass of the solution. By setting the amount within this range, it is easy to keep the above physical properties within a predetermined range.

[0038] In the production method of the present invention, powder particles of a water-soluble inorganic salt are kneaded with the water-coagulable polyurethane and the solvent to obtain a kneaded product. As the powder particles of the water-soluble inorganic salt, chlorides, sulfates, etc. of sodium, potassium, etc. can be used alone or in a mixture of two or more. Among them, sodium sulfate is preferred.

[0039] The average particle size of the powder particles of the water-soluble inorganic salt is preferably 180 to 320 μm, more preferably 200 to 290 μm, in order to easily keep the pore diameter within the above range and to easily obtain the physical properties of the above polycarbonate-based polyurethane foam. The average particle size of the powder particles can be measured by the laser diffraction / scattering method.

[0040] The powder particles of the water-soluble inorganic salt are added in the range of 300 to 700 parts by mass, preferably 400 to 600 parts by mass, based on 100 parts by mass (value converted to solid content) of the polyurethane solution. By blending the powder particles of the inorganic salt having the above particle size distribution within this addition amount range, it is easy to obtain a polycarbonate-based polyurethane foam having the above physical properties by controlling the amount of pores in the polycarbonate-based polyurethane foam.

[0041] For kneading the complex, a kneader, an auger kneader, a Banbury mixer, a screw extruder, etc. are used.

[0042] In the production method of the present invention, after obtaining the kneaded product as described above, the obtained kneaded product is defoamed and molded. The purpose of defoaming is to remove air bubbles in the composition, and the methods of defoaming and molding are not particularly limited. More specifically, for example, a method of performing vacuum defoaming using a vented extruder can be mentioned, and a method of connecting a molding die (T-die) to the above extruder and shaping it into a desired shape is preferably exemplified.

[0043] After molding, the molded body is put into water or an aqueous solution to replace the solvent with water and precipitate polyurethane, and water coagulation is performed. The mode until the molded body is put in is not particularly limited. For example, in the molding process, the kneaded product is extruded and filled into a box-shaped object with an open top using punching metal made of stainless steel 304 or the like, and molding is performed, and this can be carried out by putting it into water or an aqueous solution.

[0044] After water coagulation, an inorganic salt soluble in water is extracted and removed by water extraction. As a specific method for this, for example, after leaving the molded body of the kneaded product in a container in warm water to extract most of the inorganic salt soluble in water, this molded body is put into a general washing machine or the like and washed with water at 20 to 80 °C for about 15 to 90 minutes, and during this washing, a method of performing several water replacements can be mentioned.

[0045] The molded body thus obtained is dried. In order to prevent deterioration of the polyurethane resin due to heat, drying is preferably performed at 110 °C or lower. Drying can be performed using a box-type dryer, a tumbler-type dryer, etc.

[0046] Next, a preferred form of the cosmetic composition used in the present invention will be described in more detail. The cosmetic composition according to the present invention preferably contains at least one metal element selected from zinc, iron, and copper in terms of exhibiting excellent durability against these metal elements of the polycarbonate-based polyurethane foam. The metal element referred to here may be a simple metal element or may be in the form of a compound, but the form of a compound is preferred. Examples of the compound of the specific metal element include zinc oxide (ZnO), zinc chloride (ZnCl2), iron chloride (FeCl2), iron oxyhydroxide (FeO(OH)), ferric hydroxide (Fe2(OH)6), magnetite (Fe3O4), hematite (Fe2O3), cuprous oxide (Cu2O), copper chloride (CuCl2), and the like. In particular, the cosmetic composition of the present invention preferably contains a simple zinc metal element or a zinc compound, and particularly preferably contains zinc oxide (ZnO). Although zinc compounds such as zinc oxide have a high hydrolysis ability with respect to ester bonds, the polycarbonate-based polyurethane foam exhibits excellent durability even when impregnated with a cosmetic composition containing zinc oxide.

[0047] From the viewpoint of exhibiting excellent durability by the polycarbonate-based polyurethane foam of the present invention, the content of the specific metal simple substance or its compound in the cosmetic composition is preferably 1% by mass or more, more preferably 3% by mass or more, and particularly preferably 5% by mass or more. On the other hand, the content of the specific metal simple substance or its compound in the cosmetic composition is preferably 40% by mass or less, more preferably 30% by mass or less, and particularly preferably 25% by mass or less from the viewpoint of the versatility of the cosmetic. For example, the content of the metal compound can be measured by X-ray fluorescence analysis.

[0048] The cosmetic composition used in the present invention may be in a solid form such as liquid, semi-solid, or powder form, and is preferably liquid. The property referred to here refers to that at 25°C.

[0049] The dosage forms of the cosmetic composition include solutions, emulsions, suspensions (dispersion liquids), pastes, and gels. More specifically, there are oil-in-water (O / W) type, water-in-oil (W / O) type, W / O / W type, O / W / O type and other emulsified cosmetics, oily cosmetics, solid cosmetics, liquid cosmetics, paste-like cosmetics, powdery cosmetics, jelly-like cosmetics, gel-like cosmetics, paste-like cosmetics, polymer emulsified cosmetics, etc. In the case of an emulsion, the continuous phase of the cosmetic composition of the present invention may be an aqueous phase or an oil phase.

[0050] The viscosity of the cosmetic composition is preferably, for example, 100 mPa·s to 100,000 mPa·s, more preferably 1,000 mPa·s to 50,000 mPa·s, and particularly preferably 5,000 mPa·s to 30,000 mPa·s. With the above viscosity, the impregnation property and the discharge property become better, and the usability is improved. The viscosity of the cosmetic composition can be measured as the value measured with a No. 4 to 5 rotor of a B-type viscometer at 25°C.

[0051] In the present invention, it is preferable that the cosmetic is used by installing a carrier impregnated with the cosmetic composition in a container and discharging the cosmetic from the container through the impregnated body. Examples of the container include tube-type containers, dispenser containers, jar containers, etc. In particular, the form of a cosmetic container generally abbreviated as "compact" is preferably mentioned. The "compact" has a main body portion that is open at the top and can store the carrier of the cosmetic composition, and a lid that can open and close the opening of the main body portion and to which a mirror or the like can be attached. The "compact" may further include an applicator for taking the cosmetic composition supported on the carrier together with the carrier and applying it to the skin. Examples of the compact container are described in Japanese Patent Application Laid-Open No. 2018-527063, etc.

[0052] For example, when manufacturing cosmetics using a container such as a "compact", first, the container is filled with a cosmetic composition, and then a polycarbonate-based polyurethane foam carrier formed into a predetermined shape (for example, a flat cylindrical shape) is placed on top of the cosmetic composition. Next, by pressing this carrier from above, the carrier is pushed into the cosmetic composition in the container and the cosmetic composition is impregnated into the carrier. The usage amount of the cosmetic composition is more preferably 300 to 3,000 parts by mass, more preferably 500 to 2,000 parts by mass, and particularly preferably 800 to 1,000 parts by mass with respect to 100 parts by mass of the polycarbonate-based polyurethane foam.

[0053] The present invention provides a cosmetic comprising a cosmetic composition and a polycarbonate-based polyurethane foam impregnated with the cosmetic composition. By impregnating the polycarbonate-based polyurethane foam with the cosmetic composition, even if the cosmetic composition contains the specific metal element, the polyurethane foam can exhibit excellent durability over a long period.

[0054] The cosmetic of the present invention is not particularly limited as long as it is used for impregnating a polycarbonate-based polyurethane foam with a cosmetic composition, and can be used for foundation, concealer, lip gloss, powder, lip liner, eyeliner, mascara, eyebrow, eyeshadow, lotion, emulsion, cream, essence, gel, sunscreen, etc. In particular, the cosmetic of the present invention is preferably a cushion foundation.

Examples

[0055] Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "mass %" and "parts" means "parts by mass".

[0056] <Manufacture of polycarbonate-based polyurethane foam> A foam for impregnating cosmetics having the following configuration was prepared. (Production Example 1) The raw materials used in the production of the polyurethane elastomer (foam for impregnating cosmetics) are shown below. 82 parts by mass of a polycarbonate-based polyurethane solution 1 (solid content: 30% by mass, viscosity at 25°C: 220 Pa·s, solvent: dimethylformamide) 18 parts by mass of a polycarbonate-based polyurethane solution 2 (solid content: 35% by mass, viscosity at 25°C: 240 Pa·s, solvent: dimethylformamide) 30 parts by mass of dimethylformamide 560 parts by mass of sodium sulfate (manufactured by Tosoh Corporation, average particle size: 290 μm)

[0057] The above raw materials (total amount: about 20 kg) were put into a 30-L kneader with the temperature adjusted to 40°C and kneaded at a rotation speed of 15 rpm for 30 minutes. This was extruded at a set temperature of 40°C while performing vacuum defoaming from a vent-type extruder equipped with a T-die having an inner dimension of 300 × 25 mm. The extruded molded product was filled into a box-shaped container made of SUS304 punching metal with an inner dimension of width 300 × length 600 × height 35 mm and an open upper surface. This was immersed in water at 40°C for 24 hours to replace dimethylformamide with water, thereby performing so-called water coagulation. After the coagulation was completed and most of the sodium sulfate was extracted, the molded product was taken out of the container, put into a household washing machine, and washed with water at 50°C. Then, it was dried using a box-type dryer at 100°C for 8 hours.

[0058] The urethane foam thus obtained was processed by a screen cutter to remove the upper and lower parts, thereby obtaining a 9-mm-thick urethane foam A. A part was cut out from this urethane foam A, and a scanning electron micrograph of the cross section (cut surface) was taken. The number of pores and the pore diameter were measured by the following evaluation method. Also, the density, tensile strength, elongation at break, and hardness were measured by the following evaluation method. The results of each measurement are shown in Table 1. As a result of observation with a scanning electron microscope, the obtained urethane foam A had an open-cell structure.

[0059] (Production Example 2) The usage amount of the polycarbonate-based polyurethane solution 1 (solid content: 30% by mass, viscosity at 25°C: 220 Pa·s, solvent: dimethylformamide) was changed from 82 parts by mass to 80 parts by mass, and the usage amount of the polycarbonate-based polyurethane solution 2 (solid content: 35% by mass, viscosity at 25°C: 240 Pa·s, solvent: dimethylformamide) was changed from 18 parts by mass to 20 parts by mass. Otherwise, in the same manner as in Example 1, urethane foam B was produced and various parameters were evaluated. The scanning electron micrograph is shown in FIG. 1.

[0060] (Production Example 3) The polycarbonate-based polyurethane solution 1 (solid content: 30% by mass, viscosity at 25°C: 220 Pa·s, solvent: dimethylformamide) was changed from 80 parts by mass to 100 parts by mass, the polycarbonate-based polyurethane solution 2 (solid content: 35% by mass, viscosity at 25°C: 240 Pa·s, solvent: dimethylformamide) was changed from 20 parts by mass to 0 parts by mass, dimethylformamide was changed from 30 parts by mass to 6 parts by mass, and sodium sulfate was changed from 560 parts by mass to 480 parts by mass. Otherwise, in the same manner as in Example 1, urethane foam C was produced and various parameters were evaluated.

[0061] (Production Example 4) The usage amount of the polycarbonate-based polyurethane solution 1 (solid content: 30% by mass, viscosity at 25°C: 220 Pa·s, solvent: dimethylformamide) was changed from 82 parts by mass to 80 parts by mass. Also, the polycarbonate-based polyurethane solution 2 (solid content: 35% by mass, viscosity at 25°C: 240 Pa·s, solvent: dimethylformamide) was changed to 0 parts by mass. Further, 20 parts by mass of a polyester-based polyurethane solution (solid content: 30% by mass, viscosity at 25°C: 160 Pa·s, solvent: dimethylformamide) was used. Dimethylformamide was changed from 30 parts by mass to 6 parts by mass, and sodium sulfate was changed from 560 parts by mass to 360 parts by mass. Also, 40 parts by mass of sodium sulfate with an average particle size of 100 μm was added. Otherwise, in the same manner as in Example 1, urethane foam D was produced and various parameters were evaluated.

[0062] (Measurement Method) [Number of pores and pore diameter] Measured from a scanning electron microscope photograph. The number of pores was defined as the number of pores per inch.

[0063] [Density] The apparent density was measured in accordance with JIS K 7222 and used as the density. [Tensile strength and elongation at break] Measured in accordance with JIS K 6400-5. The shape of the test piece for tensile strength was a dumbbell-shaped test piece. The shape of the test piece for elongation at break was also a dumbbell-shaped test piece. LTS-500NB-S400 manufactured by Minebea Mitsumi was used for the test. [Hardness] Measured using an Asker rubber hardness meter type F manufactured by Kobunshi Keiki Co., Ltd.

[0064] <Examples 1-1 to 1-4, Comparative Example 1> (Evaluation method) (Foam elasticity stability) A W / O type cosmetic A with the following composition was prepared. Viscosity at 25°C: 20,000 mPa·s Zinc oxide (ZnO) 20 wt% Cyclopentasiloxane 30 wt% Water 25 wt% Titanium oxide 8 wt% Dimethicone 3 wt% Polyoxyethylene·methylpolysiloxane copolymer 3 wt% PEG-9 polydimethylsiloxyethyl dimethicone 3 wt% Triethylhexanoin 2 wt% Trimethylsiloxysilicate 1.5 wt% Glycerin 1 wt% Pentylene glycol 1 wt% Methylhydrogenpolysiloxane 0.6 wt% Isostearic acid 0.5 wt% Phenoxyethanol 0.2 wt% Iron oxide (Fe2O3, Fe3O4) 1.2 wt%

[0065] 16 g of this W / O type cosmetic A was impregnated with urethane foams A to D and foam E (1.8 g each) composed of a polyester-based polyurethane. In this state, the foam elasticity (unit: g) was measured using a FUDOH rheometer (RT-2002D·D) manufactured by Rheotech. The conditions were a baseline of 40, a stroke of 20, and a speed of 6 cm / min. The value of the foam elasticity (unit: g) indicates that the greater the numerical value, the lower the elasticity. The polyurethane in foam E was such that the proportion of the polyester-based polyurethane in the polyurethane was 100% by mass.

[0066] This W / O type cosmetic A was left to stand at 70 °C and 95% RH for 3 weeks in a state impregnated with urethane foams A to D and foam E composed of a polyester-based polyurethane. After leaving it to stand, the foam elasticity (unit: g) was measured, and it was evaluated according to the following evaluation criteria based on the ratio ((value after 3 weeks) ÷ (initial value)). The foam elasticity immediately after impregnation was taken as the initial value. A: 100% or more and less than 110%. B: 110% or more and less than 120%. C: 120% or more and less than 130%. D: 130% or more.

[0067] The appearance after leaving 16 g of cosmetic A impregnated in foams A to E to stand at 70 °C and 95% RH for 3 weeks was evaluated as follows. (Appearance) A: There is no abnormality in the foam appearance, and it has cushioning properties. B: There is no abnormality in the foam appearance, and the cushioning property has slightly decreased but is within the acceptable range. C: There is no abnormality in the foam appearance, but the cushioning property is poor. D: The foam has collapsed.

[0068]

Table 1

[0069] As shown in Table 1, the polycarbonate-based urethane foam has excellent durability compared to the polyester-based urethane foam.

[0070] <Examples 2-1 to 2-4, 3-1 to 3-4, Comparative Examples 2 and 3> (Evaluation 2) Evaluation based on differences in cosmetics Using the above-mentioned Foams A to E, each of the above items was evaluated with the following liquid compositions. The results are shown in Tables 2 and 3. The compositions of Cosmetics B and C are as follows.

[0071] Cosmetic B (W / O type cosmetic), viscosity at 25°C: 15,000 mPa·s Zinc oxide (ZnO): 8 wt% Cyclopentasiloxane: 30 wt% Water: 25 wt% Titanium oxide: 20 wt% Dimethicone: 3 wt% Polyoxyethylene·methylpolysiloxane copolymer: 3 wt% PEG-9 polydimethylsiloxyethyl dimethicone: 3 wt% Triethylhexanoin: 2 wt% Trimethylsiloxysilicate: 1.5 wt% Glycerin: 1 wt% Pentylene glycol: 1 wt% Methylhydrogenpolysiloxane: 0.6 wt% Isostearic acid: 0.5 wt% Phenoxyethanol: 0.2 wt% Iron oxide (Fe2O3, Fe3O4): 1.2 wt%

[0072]

Table 2

[0073] Cosmetic C (W / O type cosmetic), viscosity at 25°C: 22,000 mPa·s Zinc oxide (ZnO): 14 wt% Cyclopentasiloxane: 30 wt% Water 25 wt% Titanium oxide 14 wt% Dimethicone 3 wt% Polyoxyethylene·methylpolysiloxane copolymer 3 wt% PEG-9 polydimethylsiloxyethyldimethylicone 3 wt% Triethylhexanoin 2 wt% Trimethylsiloxysilicic acid 1.5 wt% Glycerin 1 wt% Pentylene glycol 1 wt% Methylhydrogenpolysiloxane 0.6 wt% Isostearic acid 0.5 wt% Phenoxyethanol 0.2 wt% Iron oxide (Fe2O3, Fe3O4) 1.2 wt%

[0074]

Table 3

[0075] As shown in Tables 1 to 3, regardless of the amount of zinc oxide in the cosmetic composition, the polycarbonate-based polyurethane foam has excellent durability.

[0076] (Impregnability) The time (seconds) until the foam A, B or E (1.8 g) was set in 16 g of Cosmetic A and impregnated was measured to evaluate the impregnability of the foam. A 1 to 15 seconds B 16 to 30 seconds C 31 to 45 seconds D 46 seconds or more The impregnated time was judged by the time when the dry spots where the sponge was not impregnated could no longer be visually confirmed from above.

[0077] (Appropriateness of skin loading) After impregnating 2.0 g of Form A, B, or E with 16 g of Cosmetic A contained in a compact-type container, 10 monitors were made to apply the cosmetic to the skin with a puff (made of polyester-based urethane), and the appropriateness of the liquid release of the cosmetic onto the skin was evaluated as follows. (Sensory evaluation). A The amount on the skin is very appropriate. B The amount on the skin is appropriate. C The amount on the skin is slightly too much or slightly too little and is a problem. D The amount on the skin is too much or too little and is a problem.

[0078] (Appropriateness of spreading) After impregnating 2.0 g of Form A, B, or E with 16 g of Cosmetic A contained in a compact-type container, 10 monitors were made to apply the cosmetic to the skin with a cosmetic puff (made of polyester-based urethane), and the ease of spreading the cosmetic in one application (appropriateness of liquid retention) was evaluated as follows. A It can be spread over a wide area in one application. B It can be spread over a slightly wide area in one application. C It is within the acceptable range. D The liquid retention is poor and it is difficult to spread.

[0079] [Table 4]

[0080] [Table 5]

[0081] [Table 6]

[0082] As shown in Tables 4 to 6, the cosmetics of each example are excellent in the impregnability of the polycarbonate-based polyurethane foam into the cosmetic composition, have good drainage properties, and exhibit excellent usability.

Claims

1. A cosmetic product comprising a cosmetic composition and a polycarbonate-based urethane foam impregnated with the cosmetic composition.

2. The cosmetic product according to Claim 1, wherein the cosmetic composition contains at least one metal element selected from zinc, iron, and copper.

3. The cosmetic product according to Claim 1 or 2, wherein the polycarbonate-based urethane foam has a closed-cell structure.

4. The cosmetic product according to Claim 1 or 2, wherein the elongation at break of the polycarbonate-based urethane foam is 150% or more and 300% or less.

5. The tensile strength of the above-mentioned polycarbonate-based urethane foam is 10 N / cm ２ or more and 45 N / cm ２ or less. The cosmetic according to claim 1.

6. The density of the polycarbonate-based urethane foam is 0.05 g / cm ３ or more and 0.15 g / cm ３ or less. The cosmetic according to claim 1 or 2.

7. The cosmetic product according to Claim 1 or 2, wherein the number of pores per inch of the polycarbonate-based urethane foam is 40 ppi or more and 130 ppi or less.

8. The cosmetic product according to Claim 1 or 2, wherein the polycarbonate-based urethane foam has a hardness of 40 or more and 70 or less on the Asker F type hardness scale.

9. A urethane foam for impregnating a cosmetic composition, which is a polycarbonate-based urethane foam.

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