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    • 专利摘要:
    Cosmetic sponge composed of a continuous porous polyurethane elastic body having a three-dimensional membrane structure, wherein the permeation time of the ethanol is in the range of from 10 seconds or more to less than 400 seconds, 150 pores or more with a maximum diameter of 15 μm or more and 150 μm or less, and 10 pores or less with a maximum diameter greater than 150 μm, are contained in a region of 1.0 mm x 1.0 mm of its cross-sectional area transverse, and the number of pores with a maximum diameter of 15 μm or more and 75 μm or less is 80% or more of the number of pores with a maximum diameter of 15 μm or more and 150 μm or less, and the apparent density is 120 to 200 kg / m3.
    公开号:FR3015199A1
    申请号:FR1462571
    申请日:2014-12-17
    公开日:2015-06-26
    发明作者:Yoshiaki Ito；Taiho Komoto；Taishi Fushimi；Tsutomu Toya
    申请人:Fushimi Pharmaceutical Co Ltd；TECHNOPOROUS KOREA CO Ltd；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to a cosmetic sponge suitably used as a foundation powder puff, in particular a puff for a liquid foundation, a method for producing a cosmetic foundation, a method for producing a cosmetic body sponge, and a method for producing a cosmetic foundation. a polyurethane elastic body forming the cosmetic sponge, and a cosmetic applicator using this cosmetic sponge. Background of the Art Recently, the finishing of the application of a foundation or the like as finely and regularly as possible on the skin, in other words a finish having a "fine attachment" and a "spreading" is required in cosmetic processes. For this reason, there is a tendency to prefer a liquid cosmetic having a low viscosity, in particular a liquid foundation whose viscosity can be easily reduced and for which an aspect of fine attachment and spreading is reliable. It has recently begun to be sold a liquid foundation allowing a finer attachment, having a masking power, which covers the hair follicles, and having a reduced thixotropy.
    [0002] When a conventional cosmetic sponge is used as an applicator for such a low-viscosity cosmetic, the cosmetic is absorbed in the innermost part of the applicator, and problems of sanitary appearance, such as the decomposition of the cosmetic remaining inside, and the like, tend to appear. Then, we want to remove the absorption in the innermost part. In contrast, if the absorption is too suppressed, the load of the cosmetic decreases and it becomes difficult to obtain regularly a large spreading surface. Therefore, a suitable absorption depth (cosmetic load) is desired. With regard to the applicator for a cosmetic having a low viscosity, various cosmetic applicators composed of polyurethane foam have been suggested. For example, patent document 1 discloses a puff in which a soft foamed body having a skin layer is used as the core material which is coated with an outer film material made of a microporous wet polyurethane. According to this puff, the excessive absorption of a cosmetic can be suppressed. However, this puff has an extremely high production cost due to complicated production steps. Patent Document 2 discloses a porous body made of a polyurethane resin obtained by adding a pore-forming agent such as polyvinyl alcohol or the like to a solution in dimethylformamide of a polyurethane resin, coagulating the mixture in water, and then washing off the blowing agent. However, this porous body has complicated pores of indefinite shape, and when this porous body is used as a cosmetic sponge, there is a problem of generating coating unevenness and cosmetic strips, due to the presence of large pores. In addition, patent document 3 discloses an expanded polyurethane having a continuous pore-containing structure, composed of a raw material in which a silicon-based water repellant and an oil repellent have been mixed. When this expanded polyurethane is used as a cosmetic sponge, an effect of preventing the absorption of a cosmetic is recognized in the initial period of use since the skeleton of the sponge is water-repellent and oil-repellent, however It is a problem that the cosmetic is pushed into an empty portion of a porous structure having continuous pores and absorbed into the innermost portion of the sponge during repeated use. In addition, patent document 4 discloses a cosmetic sponge made of a polyurethane resin having two types of networks (pores) of different diameters and having a three-dimensional crosslinked structure. Furthermore, it is disclosed that a good cosmetic sponge having excellent skin feeling, softness and cosmetic seating characteristics is achieved through a three-dimensional cross-linked structure (paragraph 0042). The cosmetic sponge having a three-dimensional cross-linked structure as described in patent document 4, however, generates the problem that a cosmetic is pushed into an empty part of the networks (pores), absorbed in the innermost part of the sponge. , and enters the sponge and adheres to the finger due to repeated use. Therefore, it is unsatisfactory as a cosmetic instrument. In addition, both the absorption depth and the spreading surface are not at satisfactory levels. In addition, patent document 5 discloses a cosmetic sponge composed of a polyurethane elastic body which is a continuously porous elastic body having a three-dimensional membrane structure, wherein the permeation time of the ethanol is 10 seconds or plus and is less than 200 seconds, and 20 or more pores having a maximum diameter of 50 μm or more and 300 μm or less are present in a region of 1.0 mm x 1.0 mm of its cross-sectional area, as a cosmetic sponge used for the application of a cosmetic having a low viscosity such as a liquid foundation or the like. In addition, it is described that if this cosmetic sponge is used, a cosmetic passes very little through permeation into the innermost portion of the sponge, and thus the absorption depth (cosmetic load) is appropriate, and gets a large spreading area. Prior Art References Patent Documents Patent Document 1 JP56-95012A 20 Patent Document 2 JP58-189242A Patent Document 3 JP6-284923A Patent Document 4 JP2004-267277A Patent Document 5 JP5148140B Summary of the Invention 25 Problem Before Patent In most liquid foundations, the sag length, measured by a method described below, is rarely recognized since the thixotropy is sufficiently large although the viscosity is low. However, it is desired or recently used liquid foundations having a lower viscosity than conventional products. Thus, many recent liquid foundations have a sag length of about 20 to 30 mm, and there are also liquid foundations with a sag length of about 70 mm. The present inventors quantitatively evaluated the charge of a cosmetic in terms of the absorption depth, described below, and quantitatively evaluated the spreading performance on the skin in terms of the spreading surface, described later. As a result, it has been found that although the cosmetic sponge described in Patent Document 5 has the excellent effect described above, when used for a liquid foundation having a lower viscosity and a lower viscosity. low thixotropy, recently desired, the absorption depth and the spreading surface are not satisfactory. For example, in the case of a cosmetic having a low viscosity and a low thixotropy, the cosmetic filling the pores in the surface of the sponge easily invades the innermost part and, when spread on the skin, the discharged quantity is insufficient and the cosmetic effect is mediocre in some cases. The object of the present invention is to provide a cosmetic sponge solving the conventional technological problems described above and in which, even when it is used for the application of a cosmetic having a reduced thixotropy and a low viscosity such as whereas a recent liquid foundation, the cosmetic passes little by permeation in the innermost part of the sponge, the load of the cosmetic (absorption depth) is suitable, and a large spreading surface is obtained, by satisfying sufficiently the recent requirements. Furthermore, it is an object of the present invention to provide a method for producing a polyurethane elastic body constituting a cosmetic sponge, with which an absorption depth and a spreading surface satisfying the recent requirements are obtained, as well as a cosmetic applicator 10 using this cosmetic sponge. Means for solving the problem The present inventors have carried out extensive studies and found as a result that a polyurethane elastic body which is a continuously porous polyurethane elastic body (polyurethane foam), having a three-dimensional membrane structure, in which the permeation time of the ethanol is within a prescribed range, containing a large amount of pores having a pore size (maximum diameter) of 15 μm or more and 75 μm or less, and having a density within a range of Prescribed, functions as a cosmetic sponge with which a depth of absorption and a spreading surface are sufficiently satisfactory to meet recent requirements, even when used for a liquid foundation having reduced thixotropy and low viscosity. The present invention has thus been realized. Namely, the present invention relates to a cosmetic sponge composed of a polyurethane elastic body 30 which is a continuously porous elastic body having a three-dimensional membrane structure, wherein the permeation time of the ethanol is in the range from 10 or more seconds to less than 400 seconds, 150 or more pores having a maximum diameter of 15 pm or greater and 150 pm or less, and 10 or fewer pores having a maximum diameter greater than 150 pm, are contained in a region 1.0 mm × 1.0 mm of its cross-sectional area, and the number of pores having a maximum diameter of 15 μm or more and 75 μm or less is 80% or more of the number of pores having a maximum diameter of 15 μm or more and 150 μm or less, and the bulk density is 120 to 200 kg / m3 (claim 1). The present invention provides the cosmetic sponge of claim 1, wherein the pore of the polyurethane elastic body described above has an approximately circular or ellipsoidal cross sectional shape (claim 2). The present invention provides a process for producing a polyurethane elastic body comprising kneading a composition containing a polyurethane coagulant in water, a solvent, a powdery and granular material of a soluble inorganic salt in water and a surfactant having an HLB of less than 8.6 as main components, to obtain a kneaded material, a step of defoaming the kneaded material described above, to obtain a blunt-kneaded material, a step molding the defoamed kneaded material described above to obtain a molded product, a step of placing the molded product described above in water or an aqueous solution to cause coagulation to form a coagulated material , a step of eluting the inorganic salt described above from the coagulated material described above in water, for removing the inorganic salt, and a drying step after the elution and removal described above, wherein the above-described powdered and granular material of the water-soluble inorganic salt has a particle size distribution in which the proportion of a group of particles having a particle size of less than 15 μm is 10% by mass or less, the proportion of a group of particles having a particle size of 15 μm or more and less than 75 μm is 35 to 85% by weight, the proportion of a group of particles having a particle size of 75 μm or more and 150 μm or less is 50% by mass or less, and the proportion of a group of particles having a size of particle size greater than 150 μm is 10% by mass or less (claim 3). In addition, the present invention provides a cosmetic applicator using the cosmetic sponge of claim 1 or 2 (claim 4). Effect of the Invention The cosmetic sponge of the present invention has pores whose diameter and number are controlled and has a three-dimensional membrane structure in which resin films and open portions are present between adjacent pores and the ratio of the surface of the resin films to the surface of the open parts is within a suitable range. Therefore: the air permeability and the permeability to liquids are obtained, and the charge of a cosmetic having a low thixotropy and a low viscosity (amount of adhesion to the cosmetic sponge) is suitable, and even a cosmetic Having a low viscosity passes very little through permeation in the innermost part of the sponge, and thus there is no lack of easy penetration of the cosmetic through the networks. When the cosmetic sponge of the present invention is used as an applicator, a large spreading surface is obtained evenly. In addition, excellent properties of no high rebound elasticity and texture with a soft, wet feel are achieved in combination. Namely, in accordance with the cosmetic sponge of the present invention, an absorption depth and a spreading surface sufficiently satisfying the recent requirements can be obtained even when used as a powder puff for a liquid foundation. having low thixotropy and low viscosity as recently desired. In accordance with the production method of the present invention, a continuously porous elastic body of a polyurethane resin having a three-dimensional membrane structure and having pores whose diameter and number are controlled (polyurethane elastic body) is obtained without complicated production steps are needed. This polyurethane elastic body functions as a cosmetic sponge of the present invention described above having excellent characteristics for a cosmetic having low thixotropy and low viscosity. The cosmetic sponge of the present invention is suitably used as a cosmetic applicator such as a foundation puff, an eye shadow applicator, and the like. In particular, it is suitably used as an applicator for a cosmetic having a low viscosity, for example for a liquid foundation having a low viscosity. Brief Description of the Drawings (Figure 1) Figure 1 shows the particle size distributions of the sodium sulfates used in the Examples and Comparative Examples. FIG. 2 is a scanning micrograph of the cross-sectional area of the cosmetic sponge obtained in FIG. 3 is a scanning micrograph of the cross-sectional area of the cosmetic sponge obtained in FIG. 4. FIG. 4 is a scanning micrograph of the sectional surface of the cosmetic sponge obtained in Comparative Example 1. (FIG. Figure 5 is a scanning electron micrograph of the cross-sectional area of the cosmetic sponge obtained in Comparative Example 2. (Figure 6) Figure 6 is a scanning electron micrograph of the cross-sectional surface of the cosmetic sponge obtained in Comparative Example 2. (Figure 6) The cosmetic sponge obtained in Comparative Example 2 (FIG. 7). FIG. 7 is a view of an equipment for measuring the permeation time of ethanol. (Figure 8) Figure 8 is a view illustrating pores of a continuously porous elastic body. BEST MODE FOR CARRYING OUT THE INVENTION The modes of implementation of the present invention will now be more specifically illustrated, but the scope of the present invention is not limited to these modes, and various modifications may be made. as part of the spirit of the invention. Constitution of the Cosmetic Sponge The continuously porous elastic body constituting the cosmetic sponge of the present invention is an elastic body of a polyurethane. The polyurethane is obtained by reacting a polyol component composed of a high molecular weight polyol and a chain extender, and a polyisocyanate compound. The high molecular weight polyol includes polyether polyols such as polypropylene glycol, polytetramethylene glycol, a polyol polymer and the like, polyester polyols such as adipate polyol, polycaprolactone polyol and the like, polycarbonate polyols, polyolefin-polyols and the like, and the desirable molecular weight is from 500 to 10,000. The chain extender includes ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,5 pentanediol, 3-methyl-1,5-pentanediol, 1,3-propanediol, and the like. The polyisocyanate compound includes aromatic isocyanates such as methylene diphenyldiisocyanate, tolylene diisocyanate, xylylene diisocyanate, 1,5-naphthylene diisocyanate, tetramethylene-xylylene diisocyanate, and the like, alicyclic isocyanates such as diisocyanate. isophorone, dicyclohexylmethane diisocyanate and the like, and aliphatic isocyanates such as hexamethylene diisocyanate, dimer acid diisocyanate, norbornene diisocyanate, and the like. The cosmetic sponge of the present invention is characterized in that it is composed of a continuously porous elastic body having a three-dimensional membrane structure. The three-dimensional membrane structure designates a structure in which the pores constituting the porous body are distributed uniformly along the three dimensional directions and communicate with one another, but a portion of the pore gaps is a film. Namely, it designates a structure in which parts of mutual contact of the pores (the surface of a pore, the boundary with an adjacent pore) are formed of a film of the resin and a pore (open portion) connecting intervals between pores.
    [0003] The three-dimensional membrane structure is a different structure of a three-dimensional crosslinked structure in which the pores constituting a porous body communicate with each other along the three dimensional directions, but a film is rarely observed in mutual pore contact parts of a body. porous. In a closed-cell polyurethane foam composed of completely closed cells, the surface of a cell (pore) is covered with a film of a polyurethane resin and has no open portion. The three-dimensional membrane structure is different from a completely closed cell polyurethane foam in that the surface of a pore is covered with a polyurethane resin film, but has an open portion. The present inventors have noted the following facts.
    [0004] In a polyurethane foam having a sponge structure in which adjacent pores are separated by a film and the pore gaps are closed (closed-cell polyurethane foam), the rebound elasticity is important, a soft touch texture and wet is not obtained, and the charge of a cosmetic (agglomeration) is poor and the spread on the skin is low. In contrast, in a polyurethane cosmetic sponge having a three-dimensional crosslinked structure as described in patent document 4, there is no film between adjacent pores, and thus a cosmetic easily penetrates through the networks, and a low spread defect occurs on the skin. The present inventors have found that a cosmetic sponge which solves the lack of easy penetration of a cosmetic, does not have a high rebound elasticity, and has a soft and moist feel, and which allows a suitable charge of a cosmetic and a wide spread on the skin, is obtained when adjacent pores are separated by a film and this film has an open portion to form a three-dimensional membrane structure in which the pores partially communicate, and when the surface ratio between the film and the open portion is adjusted to a suitable range. It has also been found that a cosmetic sponge is obtained which can be suitably applied to a cosmetic having a low thixotropy and a low viscosity, such as a liquid foundation or the like, by conferring on it also the characteristic indicated below. below. The cosmetic sponge of the present invention is characterized in that the permeation time of the ethanol is in the range of from 10 seconds or more to less than 400 seconds. The permeation time of the ethanol varies depending on the average pore size, the pore size distribution, and the surface ratio of a resin film occupying mutual pore contact portions, that is, ie the dimension of the ratio of the film to the open part between pores. As described above, the three-dimensional membrane structure and the three-dimensional crosslinked structure are distinguished by the size of the surface ratio between the film portion occupying mutual pore contact portions and the open portion in a porous body. In the three-dimensional crosslinked structure, the permeation time of the ethanol is short. In the three-dimensional membrane structure, the film surface ratio increases, and the permeation time of the ethanol increases. An ethanol permeation time of 10 seconds or more indicates a three-dimensional membrane structure in which the surface ratio of a film is greater than the prescribed value. The present inventors have found that the surface ratio between a film portion and an open portion is strongly correlated with the permeation time of ethanol. It is currently difficult to measure the surfaces of a film portion and an open portion using a micrograph and the like, and it is difficult to determine the proper range of the surface ratio directly by numerical values. However, it has been found that a sponge in which the surface ratio between a film and an open portion is within a suitable range is obtained on the basis of the measured value of the permeation time of the ethanol. In a cosmetic sponge having a three-dimensional membrane structure, the pores are formed of a film and the film is present between the pores, and therefore even a cosmetic having a low thixotropy and a low viscosity hardly pass through permeation in the most inside the sponge. At the same time, since the pores in a three-dimensional membrane structure have an open portion, there is a tendency to obtain a suitable cosmetic load, and there is a tendency to obtain a larger spreading surface. Since this surface ratio between a film portion and an open portion is in a suitable range, an excellent cosmetic sponge having a suitable absorption depth and a wide spreading surface is obtained. When the permeation time of the ethanol is shorter than 10 seconds, the sponge structure approaches a three-dimensional crosslinked structure and the spreading surface decreases, and therefore such time is not preferable. In addition, the penetration of a cosmetic is too fast and the cosmetic is absorbed in the innermost part of the sponge. Particularly in the case of a cosmetic having a low thixotropy and a low viscosity such as a liquid foundation and the like, it tends to appear a problem of penetration through the sponge, causing adhesion on the fingers. In contrast, a permeation time of ethanol greater than 400 seconds is observed in a membrane structure in which the pores are too small, and this is not preferable since the absorption depth of a cosmetic decreases. In addition, the cosmetic load becomes insufficient and the spread of the cosmetic also becomes insufficient. The permeation time of ethanol in the present invention is the time required for the permeation of a constant volume of ethanol through a polyurethane elastic body (sponge: test piece) having a prescribed thickness and area, and is measured specifically as described below. Namely: "a glass tube having a length of 300 mm and an internal diameter of 17.4 mm is placed longitudinally, a plug having a hole of (I) 6.8 mm is fixed in its lower part, and it is closed this hole with a polyurethane elastic body (test sponge) sliced to a thickness of 4.0 mm.In addition, a polyethylene film is placed from the outside of this elastic body and this film is pushed with the finger up to The position of a height of 30 mm from the bottom part of the glass tube is defined as the bottom of the scale, and the position at 130 mm and defined as the top of the scale. Ethyl alcohol is poured to the top of the ladder or higher, then the polyethylene film described above is removed, and the ethyl alcohol is allowed to flow down. where the top end of the ethyl alcohol crosses the top of the ladder at the moment the extr emitted superior crosses the bottom of the scale is defined as the permeation time of ethanol. The measurement temperature is 22 to 28 ° C. The permeation time of the ethanol is preferably 20 seconds or more and less than 350 seconds, the continuous porous polyurethane elastic body constituting the cosmetic sponge of the present invention. The invention is characterized in that a region of 1.0 mm x 1.0 mm facing its cross-sectional area contains 150 or more pores having a maximum diameter of 15 μm or more and 150 μm or less and 10 pores. or less having a maximum diameter greater than 150 pm, and the number of pores having a maximum diameter of 15 pm or more and 75% or less is 80% or more with respect to the number of pores having a maximum diameter of 15 pm or more and 150 pm or less When the number of pores is in the range described above, a cosmetic sponge having an excellent spreading surface and absorption depth can be obtained when the number of pores having a maximum diameter of 15 pm or more s and 150 pm or less is less than 150 in a region of 1.0 mm x 1.0 mm facing its cross-sectional area, the spreading surface decreases and the resulting sponge is not suitable as a than cosmetic sponge. It is preferred that the number of pores having a maximum diameter of 15 μm or more and 150 μm or less be 200 or more in a region of 1.0 mm × 1.0 mm facing its cross-sectional area. . When the number of pores with a maximum diameter of 15 μm or more and 75 μm or less is less than 80% based on the number of pores having a maximum diameter of 15 μm or more and 150 μm or less, the depth Absorption is too great and the spreading surface is reduced, and thus the resulting sponge is not suitable as a cosmetic sponge. In addition, also when the number of pores having a maximum diameter greater than 150 μm is greater than 10, the absorption depth is too great and the spreading area is reduced, and thus the resulting sponge is not suitable as than cosmetic sponge. The number of pores is the value measured by electron micrograph of the cross-sectional area of a continuously porous polyurethane elastic body. Namely, a micrograph of a region of 1.0 mm x 1.0 mm facing the cross-sectional area of a polyurethane elastic body is taken, and pores having a pore size (diameter maximum) of 15 pm or more and 75 pm or less, pores having a pore size greater than 75 pm and 150 pm or less, and pores having a pore size greater than 150 pm on the micrograph. A pore extending on the inside and outside of the measurement region counts for 0.5.
    [0005] Here, the pore size refers to the maximum distance among the two-point-binding distances on the outer circumference of a pore visually examined on a micrograph. Figure 8 is a view illustrating pores of a continuously porous elastic body and is a schematic view of a micrograph of the cutting surface, and the maximum distance among the distances connecting two points A, B on the outer circumference of a pore in Figure 8 (L in Figure 8) is called the maximum diameter.
    [0006] The shape of the cross-sectional area of a pore is an approximately circular or ellipsoidal shape in many cases (claim 2). When a pore has a shape that varies significantly with respect to an ellipsoid or an approximate circle, its shape is divided into an ellipsoid or an approximate circle and the number of ellipsoids or approximate circles is considered to be the number of pores. For example, when a protrusion is present in the central portion of a pore, the pore is divided into two or more pores having an approximately circular or ellipsoidal shape, and the number of pores is counted. In an example of Figure 8, a pore a is divided into three pores al, a2 and a3, and a pore b is divided into four pores b1, b2, b3 and b4. As a microscope for taking a micrograph, an optical microscope and an electron microscope are used.
    [0007] The continuous porous polyurethane elastic body constituting the cosmetic sponge of the present invention is characterized in that the apparent density is from 120 to 200 kg / m3. Even if pores with a maximum diameter of 15 μm or more and 150 μm or less satisfy the condition described above, when the number of pores with a maximum diameter of less than 15 μm is too large, the bulk density exceeds 200 kg / m3 in some cases. When the bulk density is less than 120 kg / m3, the strength of the resulting sponge decreases to a considerable extent, and the sponge tends to be unsuitable. When the bulk density exceeds 200 kg / m3, the sponge becomes too hard, and therefore the sponge is not suitable as a cosmetic sponge. The cosmetic sponge of the present invention having the feature described above can be produced by the process to produce a polyurethane elastic body according to the present invention as described above. We will then explain this production process. In the process for producing a polyurethane elastic body of the present invention, firstly, a step of kneading a composition containing, as main components, a polyurethane coagulant in water, a solvent, a powdery and granular material of a water-soluble inorganic salt, and a surfactant having an HLB less than 8.6, to obtain a kneaded material, is carried out.
    [0008] The replacement of a solvent with water in water or in an aqueous solution to cause the deposition of a polyurethane is called coagulation in water, and the polyurethane coagulant in water refers to a polyurethane which can to be coagulated in the water. The polyurethane elastic body constituting the cosmetic sponge of the present invention is preferably formed from a polyurethane coagulant in water. Due to coagulation in water, a preferable softness of the polyurethane foam can be achieved. Coagulation in water does not necessarily occur in water, and can also occur in an aqueous solution. For example, by causing coagulation in an aqueous solution containing an inorganic salt, a solvent and the like dissolved therein, the coagulation rate of the polyurethane is moderated to prevent the generation of very large voids (voids much larger than the size of the particle of a pore-forming agent) in some cases. The water-coagulating polyurethane includes those obtained by polymerizing a polyol component composed of a high molecular weight polyol and a chain extender and a polyisocyanate compound in a solvent. It also includes those prepared by dissolution in a solvent of a polyurethane obtained by polymerization without solvent. As the water-coagulating polyurethane used in the production process of the present invention, a solution having a solids content of 30 ± 5% by weight and having a viscosity of 30 to 300 Pa is usually used. s (value measured by a No. 6 rotor of a BH type viscometer at 25 ° C). When using a polyurethane coagulant in water having a viscosity of less than 30 Pa.s, the resistance of the resulting cosmetic sponge is in some cases disappointing. When the viscosity exceeds 300 Pa.s, the kneaded material does not flow easily and a long period of time is required for molding in some cases. The lack of high rebound elasticity and the soft, wet feel are usually expressed by the hardness. A suitable hardness for a cosmetic sponge is in the range of 30 ° to 70 ° in terms of the value measured by an Ascar F-type hardness tester. When the hardness is too low, there is a problem with example that during the production of a cosmetic puff, the step of carrying out a grinding treatment on its peripheral part becomes difficult because of extreme flexibility. In contrast, when the viscosity is high, there is a problem of poor touch due to a strong contact with the skin, as well as other problems. Usually, the hardness of a continuous porous polyurethane elastic body (cosmetic sponge) can be freely controlled by the combination of a polyol component and a polyisocyanate compound used in the synthesis of a polyurethane and by the selection of their ratio. mixture. Also in the production process of the present invention, a preferable cosmetic sponge can be obtained by appropriately selecting a polyol component and a polyisocyanate compound. The solvent used in the production process of the present invention usually includes organic solvents such as dimethylformamide, dimethylsulfoxide, dioxane, tetrahydrofuran, methylpyrrolidone and N-methylpyrrolidone, as well as a mixture thereof. Among them, dimethylformamide is preferred because of its ability to be easily extracted with water in the next step, and the odor of the solvent and its flammability in a working environment. The solvent is used to adjust the fluidity of the kneaded material in some cases. For example, in the case of a polyurethane solution having a solids content of 30% by weight (polyurethane coagulant in water), the solvent is preferably added in an amount ranging from 2 to 50 mass parts per 100 parts by mass of the polyurethane solution. When the added amount is less than 2 parts by weight, the kneaded material does not flow easily and a long period of time is required for molding, whereas when the added amount exceeds 50 parts by weight, the resulting cosmetic sponge resistance is too low in some cases. In the production method of the present invention, a powdery and granular material of a water-soluble inorganic salt is kneaded with a polyurethane coagulating in water to form a kneaded material. As the powdery and granular material of a water-soluble inorganic salt, sodium, potassium, and similar chlorides, sulfates and the like may be used alone or in combination of two or more thereof.
    [0009] The production method of the present invention is characterized in that the powdery and granular material of a water-soluble inorganic salt to be kneaded with a polyurethane coagulant in water and a solvent has a particle size distribution in which the proportion of a group of particles having a particle size of less than 15 μm is 10% by mass or less, the proportion of a group of particles having a particle size of 15 μm or more and less than 75 μm is at 85% by weight (preferably 35 to 55% by weight), the proportion of a group of particles having a particle size of 75 μm or more and 150 μm or less is 50% by mass or less and the proportion of a group of particles having a particle size greater than 150 μm is 10% by mass or less. By using such a material having the particle size distribution described above as a powder and granular material of a water-soluble inorganic salt, a polyurethane elastic body having a region of 1.0 can be obtained. mm x 1.0 mm of the cross-sectional area of the polyurethane elastic body contains 150 or more pores having a maximum diameter of 15 μm or more and 150 μm or less and 10 or fewer pores having a maximum diameter greater than 150 μm, and the number of pores having a maximum diameter of 15 μm or greater and 75 μm or less is 80% or more based on the number of pores having a maximum diameter of 15 μm or more and 150 μm or less. The powdery and granular material of a water-soluble inorganic salt is added in an amount ranging from 100 to 2000 parts by weight, preferably from 500 to 1500 parts by weight, per 100 parts by weight of polyurethane (value reduced to the dry matter content). By mixing the pulverulent and granular material of an inorganic salt having the particle size distribution described above in an addition amount within this range, a polyurethane elastic body having a bulk density of 120 to 200 kg can be obtained. m3. When the amount of addition is 100 parts by mass or less, the inorganic salt is distributed without connection in the composition, and thus a non-uniform sponge skeleton structure is obtained. In contrast, when this amount exceeds 2000 parts by mass, the mechanical strength of the resulting sponge decreases to a considerable extent, and thus the sponge tends to be unsuitable. The production method of the present invention is characterized in that a surfactant having an HLB of less than 8.6 may coexist as a three-dimensional membrane structure forming agent in a step of kneading a composition containing a polyurethane coagulant in water, a solvent and a powdery and granular material of a water-soluble inorganic salt as the main components, to obtain a kneaded material. With the coexistence of a surfactant having an HLB less than 8.6, the resultant polyurethane elastic body tends to have a three-dimensional membrane structure. In the case where a surfactant having an HLB of 8.6 or higher is used only, the resulting cosmetic sponge tends to have a three-dimensional crosslinked structure. A surfactant having an HLB of 8.2 or less is preferably used, and in this case the cosmetic sponge tends to have a three-dimensional membrane structure. The HLB index is a known index representing the balance between the hydrophilicity and the hydrophobicity of a surfactant, and a method for determining this index is described in KAGAKU JITEN (Chemical Dictionary) edited by Michinori OKI et al, published by TOKYO KAGAKU DOZIN, Co. Ltd. page 178. In the case where the surfactant is a fatty acid ester, for example, the value is calculated by the following equation: HLB = 20. (1-SV / NV) in which SV is the saponification index of the ester and NV and the neutralization index of the fatty acid. The amount of surfactant addition having an HLB of less than 8.6 is desirably in the range of from 5 to 45 parts by weight per 100 parts by weight of polyurethane (value reduced to the content of the extract). dry). When the amount of addition is less than 5 parts by weight, the cosmetic sponge tends to have a three-dimensional crosslinked structure. When the amount of addition exceeds 45 parts by weight, the polyurethane elastic body has a three-dimensional membrane structure, however such an amount of addition is not preferable because a sticky feel is felt on the finger because of an excessive amount of addition. Examples of surfactants having an HLB of less than 8.6 include fatty acid esters of sorbitan, oxyethylenated adducts of beef tallow glyceride, fatty acid and polyglycerol esters, polyethylene glycol oleates, and the like. special phenolic ethoxylates. As fatty acid esters of sorbitan, mention may be made of sorbitan sesquioleate (3,7), sorbitan monooleate (4,3), sorbitan monostearate (4,7) and the like. As the oxyethylenated admixture of beef tallow glyceride, there may be mentioned NK-3 (6,6) manufactured by ADEKA CORPORATION and the like. As esters of fatty acid and polyglycerol, mention may be made of diglycerol monolaurate (8.5), diglycerol monopalmitate (7.3), diglycerol monostearate (6.9), tetraglycerol tristearate, and the like. (4,7), tetraglycerol pentastearate (2,7), hexaglycerol tristearate (6,5), hexaglycerol pentastearate (4,2), decaglycerol pentastearate (6,4), decaglycerol heptastearate (4.3), decaglycerol octastearate (4.3), decaglycerol decastearate (3.4), decaglycerol heptabenenate (4.2), decaglycerol decabehenate (2.3) , diglycerol monooleate (6.9), diglycerol sesquioleate (4.9), diglycerol dioleate (3.7), diglycerol tetraoleate (1.5), tetraglycerol pentaoleate (2.7) , hexaglycerol pentaoleate (4.2), tetraglycerol tetraoleate (7.6), decaglycerol pentaoleate (6.4), decaglycerol hexaoleate (5.6), decaglycerol heptaoleate (4), , 9) decaglycerol octaoleate (4.3), decaglycerol decaoleate (3.4), decaglycerol nonaeruacate (3.2), diglycerol monoisopalmitate (7.3), diglycerol monoisostearate (6.9) , diglycerol diisostearate (3,7), diglycerol triisostearate (2,3), diglycerol tetraisostearate (1,5), triglycerol diisostearate (5,3), and the like. As polyethylene glycol electrolytes, there may be mentioned OEG-102 (7.9) manufactured by ADEKA CORPORATION and the like. As a special phenolic ethoxylate, there may be mentioned PC-1 (4,2) manufactured by ADEKA CORPORATION and the like. In the above, the numbers in parentheses indicate the HLB indices. If necessary, other components may be added to the water-coagulating polyurethane-containing composition, a solvent, a powdery and granular material of a water-soluble inorganic salt and a surfactant having a HLB value of less than 8.6 as main components. For example, a water-soluble polymer can be added to fluidize the kneaded material. With respect to this water-soluble polymer, those dissolved also in a solvent are preferred. Examples of this polymer include synthetic products such as polyvinyl alcohol and the like, semi-synthetic products such as methylcellulose, carboxymethylcellulose and the like, and natural substances such as polymeric polysaccharides and the like. Further, in addition to the surfactant described above having an HLB value of less than 8.6, a surfactant having an HLB of 8.6 or higher may also be added, to such an extent that the spirit of the The invention is not deteriorated to render the resulting polyurethane elastic body hydrophilic. In addition, it is also possible to add, if necessary, a coloring agent, and functional materials such as an antioxidant, antifungal agent, an antibacterial agent, various materials having a lubricating function, an ignition retardant, conductive materials. such as carbon black, and the like. To knead the composition, kneaders, Auger kneaders, Banbury mixers and single-screw and twin-screw extruders were used. In the production process of the invention, a kneaded material is obtained thereon, and the resultant is defoamed and molded. The purpose of defoaming is air cells in the composition; In the present invention, defoaming and molding are not as hereinbefore described kneaded material to eliminate particularly limited processes, and are specifically illustrated by a method of effecting reduced pressure defoaming using an aerating type extruder. . An exemplary method of connecting a mold mouth (T-die) to the extruder described above is preferably provided and the kneaded material is shaped to a desired shape. After molding, the molded body is placed in water or an aqueous solution, thus replacing a solvent with water to cause polyurethane deposition, and coagulation is carried out in water. The manner in which the molded body is placed is not particularly limited. For example, the kneaded material is extruded and fed into a box having an open top surface formed by use of a stamping metal made of 304 stainless steel or the like, after which the material is molded in a molding step, then the molded material is placed in water or in an aqueous solution.
    [0010] After coagulation in water, the water-soluble inorganic salt is removed by extraction with water. As a specific method for carrying out this procedure, for example, a molded body of the kneaded material placed in a container is left in hot water and the majority of the water-soluble inorganic salt is extracted, and then this body The mold is introduced into a general purpose washing machine or the like, washed with water at 20-80 ° C for about 15 to 90 minutes and during this wash the water is changed several times. The molded body thus obtained is dried. To prevent heat degradation of the polyurethane resin, the drying preferably takes place at 110 ° C or less. The drying may be effected by means of a drying cabinet, a tumble dryer, and the like. As described above, a polyurethane elastic body having a three-dimensional membrane structure is obtained. When a low viscosity cosmetic such as a liquid foundation or the like is placed on the surface of a cosmetic sponge obtained from the polyurethane elastic body of the present invention, the cosmetic is stored quickly in the pores as the Cosmetic has a low viscosity. When the sponge is a continuously porous elastic body and a film is not formed between the pores (three-dimensional crosslinked structure), the foundation easily migrates into an adjacent pore, and thus continues to be absorbed into the pores. The innermost part of the sponge, and the problem of penetration through the sponge until adhering to the finger, and other problems, tend to appear. When the sponge has a three-dimensional membrane structure, a film is present between adjacent pores, and therefore the migration of the foundation into an adjacent pore in the innermost portion is disturbed after storage near the surface of the sponge, and the foundation stays in the surface part of the sponge. The problem described above is therefore removed. In the cosmetic sponge of the present invention, this effect is more pronounced than in conventional cosmetic sponges, and this effect is sufficiently manifest even in the case of a cosmetic having a reduced viscosity and a low thixotropy, namely a base of liquid complexion. In addition, the cosmetic sponge produced by coagulation in water satisfies the requirement of softness for a cosmetic sponge. The cosmetic sponge of the present invention does not have a high resilience to rebound, has a texture imparting a soft and moist feel, does not cause a lack of penetration of a cosmetic, allows a suitable charge of a cosmetic (depth d absorption), and gives a large area of spreading. Therefore, this cosmetic sponge is used for a cosmetic applicator such as a foundation puff, an eye shadow applicator and the like.
    [0011] The present invention provides a cosmetic sponge described above and a method for producing a polyurethane elastic body used for the formation thereof and, in addition, but also at disposal a cosmetic applicator using this cosmetic sponge (elastic body polyurethane) (claim 4).
    [0012] Examples Evaluation Method [Micrograph: number of pores with a maximum diameter of 15 μm or more and 150 μm or less] A cosmetic sponge is cut out, and a micrograph of the cut surface is taken using a scanning electron microscope JSM5500LV manufactured by JEOL Ltd. The number of pores with a maximum diameter of 15 μm or more and 75 μm or less and the number of pores with a maximum maximum diameter are measured on a micrograph at 50x (magnification of 50) up to 400x (magnification of 400). at 75 pm and 150 pm or less, and converted to number per cut area of 1.0 mm x 1.0 mm (1.0 mm squared). [Bulk density]: measured in accordance with JIS K 7222. [Tensile strength and elongation]: measured in accordance with JIS K 6400-5. [Hardness]: measured by means of an Ascar F hardness measuring device. [Viscosity (and thixotropy) of a foundation: sag length] A foundation is placed in an amount of 0. 11 to 0.13 g on a horizontally placed clear film (KOKUYO Recycled OHP Film: VF-1300N) using a syringe, and then the film is drawn vertically. Here, a foundation having low thixotropy and low viscosity begins to sag, and is allowed to stand until the collapsed portion has dried to be set (about 24 hours, 22 to 28 hours). ° C). The collapsed length is then measured by caliper, and represents the slump length. [Absorption depth] A foundation with a slump length of 23 mm is used. This film, cut into a square of 10 mm, is adhered with a double-sided adhesive tape on a horizontal transparent film (recycled OHP film of KOKUYO: VF-1300N). The foundation described above is placed on this cut portion (10 x 10 x 0.2 mm) using a syringe, and the foundation is scraped with a thin metal sheet (straight ruler: KOKUYO PRO TZ-RS15 ) to flatten the surface, then wipe with a cotton swab the excess foundation that adhered to the peripheral regions. Next, a sample of 2 cm squares (sponge) having a thickness of 8 mm is placed on top of it. A weight of 500 g is placed on it and removed within a second. This operation is repeated 10 times, then the sponge is cut longitudinally with sharpened scissors, and the depth of cosmetic absorbed in the sponge is measured by means of a straight ruler. The measurement temperature is 22 to 28 ° C. [Plating surface] A 2 cm square SUS304 plate having a thickness of 0.75 mm is adhered with a double-sided adhesive tape to a 2 cm square (sponge) sample having a thickness of 8 cm. mm. A foundation is then placed on the sample (sponge) in the same manner as in the case of measuring the depth of absorption, described above. After the foundation has adhered, the sample is placed on a square paper (KOKUYO ho-14N B4.1 mm square (240 x 340)), a finger is placed on the surface in SUS and the surface is pushed. uniformly so that the thickness of the sponge becomes 4 mm, to stretch the cosmetic, and the stretched area (cm 2) of the cosmetic is measured. The measurement temperature is 22 to 28 ° C. [Permeation time of ethanol] A test tube having a length of 300 mm and an internal diameter of 17.4 mm is placed longitudinally and a stopper with a hole of (I) 6 is fixed in its lower part. 8 mm. The cross-sectional view of this plugged glass tube is shown in FIG. 7. This hole is closed with an elastic body (sponge: test piece) sliced to a thickness of 4.0 mm using a fixing tool (its view in Cross section and plan view are shown in Figure 7 (b) as shown in Figure 7 (b). The view after closing the hole with the elastic body is shown in Figure 7 (c). In addition, a polyethylene film is placed from the outside of this elastic body and the film is pushed with the finger until it reaches a seal. The position of a height of 30 mm from the bottom part of the glass tube is defined as the bottom of the scale, and the position at 130 mm is defined as the top of the scale. Ethyl alcohol is poured to a height of 200 mm, and then the polyethylene film described above is removed so that the ethyl alcohol can flow downwards. The time from when the top end of the ethyl alcohol crosses the top of the ladder when the top end passes through the bottom of the ladder is defined as the permeation time of the ethanol. The measurement temperature is 22 to 28 ° C. Example 1 The raw materials used for producing the polyurethane elastic body (cosmetic sponge) are shown below. F-151 (polyester-polyurethane manufactured by Fushimi Pharmaceutical Co., Ltd., solids content: 30%) 50 parts by weight .T-191 (polyether polyurethane manufactured by Fushimi Pharmaceutical Co., Ltd., content solids content: 30%) 50 parts by weight. Dimethylformamide 15 parts by weight. Soren 30 (sorbitan sesquioleate manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB: 3.7) 15 4 parts by weight. Neutral anhydrous sodium B (marketed by Fushimi Pharmaceutical Co., Ltd.) 400 parts by weight Neutral anhydrous sodium sulfate B has a particle size distribution shown in Table 1 and Figure 1. Particle size distributions of anhydrous sodium sulfates The above-described raw materials (about 20 kg in total) are introduced into a kneader having a kneading capacity, and the comparative examples are also shown in Table 1 and Figure 1. 30 liters, adjusted to a temperature of 40 ° C, and kneaded for 30 minutes at a rotation speed of 15 rpm. Extrude with a vent type extruder equipped with a T-die having an internal dimension of 300 x 20 mm at a preselected temperature of 40 ° C while defoaming under reduced pressure. The extruded molded product is introduced into a box-shaped container having an open top surface having an inner dimension of 300 mm wide x 600 mm long x 30 mm high, made of SUS304 stamping steel. It is immersed in water at 50 ° C for 24 hours to cause dimethylformamide to be replaced by water and to coagulate with water. Once the coagulation and extraction of the majority of the inorganic salt (sodium sulfate) is complete, the molded product is removed from the container and placed in a domestic washing machine and washed with water at room temperature. 50 ° C. It is then dried at 100 ° C. over a period of 8 hours using a drying cabinet. The upper and lower portions of the thus-obtained sponge are removed with a strip knife splitter to obtain cosmetic sponges having a thickness of 8 mm or 4 mm. Part of this sponge is cut out, and a scanning electron micrograph is taken of its surface in cross-section (cutting surface), and the number of pores having a pore size is measured by the evaluation method described above. (maximum diameter) 15 μm or greater and 75 μm or less, the number of pores having a pore size greater than 75 μm and 150 μm or less, and the number of pores having a pore size greater than 150 μm . In addition, the evaluation methods described above measure bulk density, tensile strength and elongation, hardness, absorption depth, spreading area and permeation time. ethanol. The scanning electron micrograph is shown in Figure 2, and the measurement results are shown in Table 2. As shown in Figure 2, the resulting cosmetic sponge has a three-dimensional membrane structure. Example 2 A polyurethane elastic body was obtained in the same manner as in Example 1 except that neutral anhydrous sodium sulfate C (marketed by Fushimi Pharmaceutical Co., Ltd.) having the particle size distribution indicated in US Pat. Table 1 and in Figure 1 instead of neutral anhydrous sodium sulfate B. Then, in the same manner as in Example 1, the number of pores having a pore size (maximum diameter) of 15 μm or more and of 75 μm or less, the number of pores having a pore size greater than 75 μm and 150 μm or less, and the number of pores having a pore size greater than 150 μm, the bulk density, the resistance and the tensile elongation, hardness, absorption depth, spreading area, and permeation time of ethanol. The scanning electron micrograph is shown in Figure 3, and the measurement results are shown in Table 2. As shown in Figure 3, the resulting cosmetic sponge has a three-dimensional membrane structure. Comparative Example 1 A polyurethane elastic body was obtained in the same manner as in Example 1 except that neutral anhydrous sodium sulfate A (marketed by Fushimi Pharmaceutical Co., Ltd.) having the indicated particle size distribution was used. in Table 1 and in Figure 1 in place of neutral anhydrous sodium sulfate B. Then, in the same manner as in Example 1, the number of pores with a pore size (maximum diameter) of 15 μm or more and 75 pm or less, the number of pores having a pore size greater than 75 pm and 150 pm or less, and the number of pores having a pore size greater than 150 pm, the bulk density, the resistance and the tensile elongation, hardness, depth of absorption, spreading surface, and permeation time of the ethanol. Scanning electron micrograph is shown in Figure 4, and the measurement results are shown in Table 2. Table 1 Sodium sulfate Range of particle size, pm 0-15 15-75 75-150 15-150 150 <A 3 , 14 26.34 17.05 46.53 53.47 B 5.22 44.88 43.08 87.96 6.82 C 9.14 83.34 6.91 99.39 0.61 R-15 79 , 74 20.26 0 0 0 Unit:% by weight Comparative Example 2 Sodium sulfate C (marketed by Fushimi Pharmaceutical Co., Ltd.) was pulverized and classified using a spray and classification machine described below, to produce sodium sulfate called R-15, having a particle size distribution shown in Table 1 and in Figure 1. The particle size distribution of R15 was measured using a grain size distribution measuring instrument described below. The same applies to the other sodium sulfates used in the examples and comparative examples. - ACM Pulverizer type H spray and classification machine manufactured by Hosokawa Micron Corporation, model: ACM-30H Particle size distribution measuring instrument: Microtrac HRA manufactured by Honewell, model: 9320-x100 An attempt is made to obtain a polyurethane elastic body in the same manner as in Example 1 except that sodium sulfate B is used in place of the sodium sulfate R-15 described above. However, in the sponge after drying, a sharp shrinkage is observed, the length being 69% of the dimension usually obtained, and the type F hardness is 100 at the upper limit. Namely, this sponge can not be used as a cosmetic sponge. Therefore, the amount of R-15 addition described in the example is reduced by half, and the same procedure as in Example 1 is repeated. In this case, a polyurethane elastic body can be obtained. almost usual size. However, as its hardness is too high, it is difficult to use the product as a cosmetic sponge. Then, the number of pores having a pore size of 15 μm or more and 75 μm or less, the number of pores having a pore size greater than 75 μm, and the number of pores having a pore size of greater than 75 μm are measured in the same manner as in Example 1. 150 pm or less, and the number of pores having a pore size greater than 150 pm, bulk density, tensile strength and elongation, hardness, depth of absorption, spreading surface and permeation time of ethanol. The scanning electron micrograph is shown in FIG. 5, and the measurement results are shown in Table 2. RX sodium sulfate is obtained by cutting S-sodium sulfate particles having a particle size of 75 μm or less with a sieve. A polyurethane elastic body is obtained in the same manner as in Example 1, except that sodium sulfate RX is used in place of neutral anhydrous sodium sulfate B. Then, the same measurement as in Example 1 The number of pores having a pore size (maximum diameter) of 15 μm or more and 75 μm or less, the number of pores having a pore size greater than 75 μm and 150 μm or less, and the number of pores having a pore size greater than 150 μm, apparent density, tensile strength and elongation, hardness, depth of absorption, spreading surface and permeation time of ethanol. The scanning electron micrograph is shown in Figure 6, and the measurement results are shown in Table 2.
    [0013] Table 2 Example Example Example Example Example 2 Comparative 1 Comparative 2 Comparative 3 Blowing agent B C A R-15 RX Micrograph 2 Fig. 3 Fig. 4 Fig. Fig. 6 scanning electron Number of pores with a pore size of 15-75 μm 228 444 56 56 24 75-150 pm 36 8 64 0 72> 150 pm 4 0 12 0 8 Bulk density (kg / m3) 160 160 160 260 160 Tensile strength (kPa) 230 205 270 558 300 Elongation (%) 290 320 310 316 280 Hardness (type F) (°) 52 55 50 86 50 Permeation time of ethanol (s) 37 342 22 797 Absorption depth (mm) 1.2 0.7 3.8 0.1 3.2 Plating area (cm 2) 91 89 33 37 40 In Comparative Example 2, in which powder and granular material of an inorganic salt, sodium sulfate R-15 containing a group of particles having an average particle size of less than 15 μm in an amount well above 10% by weight (about 80% by weight) and not containing a group of particles having a particle size greater than 75 μm, a cosmetic sponge is obtained in which the number of pores with a maximum diameter of 15 μm or more and e 150 μm or less is well below 150 and the bulk density is well above 200 kg / m3. Although this cosmetic sponge has a three-dimensional membrane structure (in accordance with a scanning electron micrograph), its permeation time of ethanol is greater than 400 seconds. The absorption depth is low, the cosmetic load is insufficient, and the spreading surface is small. These properties are unfavorable for a cosmetic sponge, and do not meet recent requirements. This result indicates that when a sodium sulfate containing a group of particles having a particle size of less than 15 μm in an amount of greater than 10% by weight is used, a porous body suitable for a cosmetic is not obtained.
    [0014] In Comparative Example 1, sodium sulfate A in which the proportion of a group of particles having a particle size of 15 to 75 μm is used as the powder and granular material of an inorganic salt. is less than 35% by weight and the proportion of a group of particles having a particle size greater than 150 μm far exceeds 10% by weight, a cosmetic sponge is obtained in which the number of pores with a maximum diameter of 15 pm or more and 150 pm or less is less than 150 and the number of pores with a maximum diameter of 15 pm or more and 75 pm or less is 50% or less with respect to the number of pores having a maximum diameter of 15 pm or more and 150 pm or less. In this cosmetic sponge, the depth of foundation absorption is too great, and therefore the cosmetic is pressed into a vacant part of the network (pore) and absorbed in the innermost part of the sponge, and it tends to pose a problem of penetration through the sponge until the adhesion to a finger, and furthermore the spreading surface is small. Namely, these properties are unfavorable for a cosmetic sponge, and do not meet recent requirements. In Comparative Example 3, in which the same procedure as in Example 1 is carried out except that sodium sulfate RX obtained by cutting sodium bisparticle particles B having a particle size of 75 μm is used. or less with a sieve, a cosmetic sponge is obtained in which the number of pores having a maximum diameter of 15 μm or more and 150 μm or less is less than 150 and the number of pores having a maximum diameter of 15 μm or more and 75 pm or less is 50% or less with respect to the number of pores having a maximum diameter of 15 pm or more and 150 pm or less. In this cosmetic sponge, the permeation time of the ethanol is less than 10 seconds. In this cosmetic sponge, the absorption depth is large, the spreading surface is small, and the cosmetic load is insufficient. These properties are unfavorable for a cosmetic sponge, and do not meet recent requirements.
    [0015] An attempt was made to obtain a polyurethane elastic body in the same manner as in Example 1 except that permeate permeation particles were used for the cutting described above (sodium sulfate particles having a particle size of 75 μm or less, the amount of particles having a particle size of 15 μm or more and 75 μm or less, calculated on the basis of the particle size distribution of sodium sulfate B, exceeds 85%) . However, in the sponge after drying, there is a phenomenon of shrinkage, the type F hardness is 100, that is to say that we do not obtain a soft porous body suitable for a cosmetic. In contrast, in Examples 1 and 2 in which a powdery and granular material of an inorganic salt having a particle size distribution in which the proportion of a group of particles having a particle size of less than 15 μm is 10% is used. or less, the proportion of a group of particles having a particle size of 15 μm or more and 75 μm or less is 35 to 85% by mass, the proportion of a group of particles having a particle size of particle exceeding 75 μm and 150 μm or less is 50% by mass or less, and the proportion of a group of particles having a particle size exceeding 150 μm is 10% by mass or less, an elastic body is obtained polyurethane material having a three-dimensional membrane structure in which the permeation time of the ethanol is in the range of from 10 seconds or more to less than 400 seconds, a region of 1.0 mm x 1.0 mm from its surface in cross section co contains 150 or more pores with a maximum diameter of 15 μm or more and 150 μm or less, and the number of pores with a maximum diameter of 15 μm or more and 75 μm or less is 80% or more with respect to number of pores having a maximum diameter of 15 μm or more and 150 μm or less, and the bulk density is 120 to 200 kg / m3. The cosmetic sponge composed of this elastic polyurethane body has an absorption depth within a suitable range, has a wide spreading surface, can be suitably used for the application of a liquid foundation having a low viscosity and a reduced thixotropy, and satisfies sufficiently the recent requirements. Example 3 The surface layers of the front and rear sides of the polyurethane elastic body obtained in Example 1 were removed using a strip knife splitter to obtain a cosmetic sponge having a thickness of 8 mm. This sponge body is cut with a Thomson blade and the cutting surface is ground with a rotary grinding wheel to obtain a cosmetic applicator (cosmetic powder puff) having a thickness of 8 mm and a diameter of 60 mm. Industrial Applicability The cosmetic sponge of the present invention is suitably used as an applicator for a recent cosmetic having a low viscosity such as a liquid foundation and the like. The polyurethane elastic body produced by the process of the present invention is suitably used for the formation of the cosmetic sponge of the present invention. In addition, if carbon blacks such as acetylene black (manufactured by DENKI KAGAKU KOKYO KABUSHIKI KAISHA), Ketchen black (manufactured by Ketchen Black International) and the like, a metal powder, a metal oxide, fibers are blended. of carbon, metal fibers, metallized fibers, graphite, metal chips, and the like, in this polyurethane elastic body in a step of obtaining a kneaded material, a moderate to high electrical conductivity can be imparted (by for example, the surface resistivity is 104 to 1010 square (w / square) required for a safe ESD. The polyurethane elastic body with this conductivity is also suitable for a roller, a wipe, a swab and the like for the purpose of removing static electricity from a magnetic head, a magnetic recording medium, a printed circuit substrate, liquid crystal substrate, and the like. Further, if a surfactant having a high HLB index is mixed in a step of obtaining a kneaded material, an excellent water absorption property can be obtained, and the polyurethane elastic body having this property of Water absorption is also suitable for washing with a water-absorbing sponge and a brush when washing with water after a chemical treatment step of precision mechanical equipment and electronic parts.
    权利要求:
    Claims (4)
    [0001]
    REVENDICATIONS1. A cosmetic sponge composed of a polyurethane elastic body which is a continuously porous elastic body having a three-dimensional membrane structure, wherein the permeation time of the ethanol is in the range of from 10 seconds or more to less than 400 seconds, 10 150 or more pores with a maximum diameter of 15 μm or more and 150 μm or less, and 10 or fewer pores with a maximum diameter greater than 150 μm, are contained in a region of 1.0 mm × 1, 0 mm of its cross-sectional area, and the number of pores having a maximum diameter of 15 μm or more and 75 μm or less is 80% or more of the number of pores having a maximum diameter of 15 μm or more and 150 μm or less, and the bulk density is 120 to 200 kg / m3. 20
    [0002]
    The cosmetic sponge of claim 1, wherein the pore of the polyurethane elastic body described above has an approximately circular or ellipsoidal cross sectional shape. 25
    [0003]
    A process for producing a polyurethane elastic body, comprising kneading a composition containing a polyurethane coagulant in water, a solvent, a powdery and granular material of a water-soluble inorganic salt and a surfactant having an HLB value of less than 8.6 as a primary component, to obtain a kneaded material, a step of defoaming the kneaded material described above, to obtain a kneaded kneaded material, a step of molding the kneaded kneaded material described above to obtain a molded product, a step of placing the molded product described above in water or an aqueous solution so as to cause coagulation, to form a coagulated material, a step of eluting the inorganic salt described above from the coagulated material described above in water, to remove the inorganic salt, and a step of drying after elution and shrinkage described above, wherein the above-described powdered and granular material of the water-soluble inorganic salt has a particle size distribution in which the proportion of a group of particles having a size of If the particle size of less than 15 μm is 10% by mass or less, the proportion of a group of particles having a particle size of 15 μm or more and less than 75 μm is 35 to 85% by weight, the proportion a group of particles having a particle size of 75 μm or more and 150 μm or less is 50% by mass or less, and the proportion of a group of particles having a particle size greater than 150 μm. is 10% by mass or less. 30
    [0004]
    Cosmetic applicator using the cosmetic sponge according to claim 1 or 2.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    JP2013262370A|JP6280361B2|2013-12-19|2013-12-19|Sponge for makeup, method for producing polyurethane elastic body, and cosmetic applicator|
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