WO2015093085A1 - 化粧用スポンジ、ポリウレタン弾性体の製造方法、及び化粧料塗布具 - Google Patents
化粧用スポンジ、ポリウレタン弾性体の製造方法、及び化粧料塗布具 Download PDFInfo
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- WO2015093085A1 WO2015093085A1 PCT/JP2014/068580 JP2014068580W WO2015093085A1 WO 2015093085 A1 WO2015093085 A1 WO 2015093085A1 JP 2014068580 W JP2014068580 W JP 2014068580W WO 2015093085 A1 WO2015093085 A1 WO 2015093085A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4269—Lactones
- C08G18/4277—Caprolactone and/or substituted caprolactone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
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- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D2200/00—Details not otherwise provided for in A45D
- A45D2200/10—Details of applicators
- A45D2200/1009—Applicators comprising a pad, tissue, sponge, or the like
Definitions
- the present invention relates to a cosmetic sponge suitably used as a foundation puff, in particular, a liquid foundation puff, a method for producing a polyurethane elastic body forming the cosmetic sponge, and a cosmetic applicator using the cosmetic sponge. .
- Patent Document 1 discloses a puff in which a soft foam having a skin layer is used as a core material and the core material is covered with a microporous wet polyurethane skin material. According to this puff, excessive absorption of cosmetics can be suppressed. However, this puff has a very high manufacturing cost due to its complicated manufacturing process.
- Patent Document 2 describes a polyurethane resin porous body obtained by adding a pore-generating agent such as polyvinyl alcohol to a dimethylformamide solution of a polyurethane resin, coagulating in water, and then washing away the pore-generating agent. Yes.
- a pore-generating agent such as polyvinyl alcohol
- this porous body has complicated and irregular pores, and when used as a cosmetic sponge, there is a problem that uneven application of cosmetics and streaks occur due to the presence of huge pores.
- Patent Document 3 discloses a polyurethane foam having a continuous pore structure made of a raw material kneaded with a silicone-based water / oil repellent.
- this foamed polyurethane is used as a cosmetic sponge, the sponge skeleton is water- and oil-repellent, so that the effect of preventing the absorption of cosmetics is recognized in the initial stage of use. There is a problem that it is pushed into the hole and absorbed into the back of the sponge.
- Patent Document 4 discloses a cosmetic sponge made of polyurethane resin having two types of meshes (holes) having different diameters and having a three-dimensional network structure. And since it is a three-dimensional network structure, it is described that the cosmetic sponge excellent in the touch, the softness
- Patent Document 5 as a cosmetic sponge used for application of cosmetics with low viscosity such as a liquid-like foundation, it is a continuous pore elastic body having a three-dimensional membrane structure, and the ethanol permeation time is 10 seconds or more.
- a cosmetic sponge comprising a polyurethane elastic body having a maximum diameter of 50 ⁇ m or more and 300 ⁇ m or less within a range of less than 200 seconds and a cross section of 1.0 mm ⁇ 1.0 mm. ing. And if this cosmetic sponge is used, it is described that the cosmetic does not easily penetrate into the inner part of the sponge, so that the absorption depth (including cosmetics) is moderate and a large stretched area can be obtained. Yes.
- liquid foundations having a lower viscosity than conventional products have been desired and used.
- the conventional liquid foundation has a high thixotropy although it has a low viscosity
- many of the liquid foundations have almost no sagging length measured by the method described below.
- many liquid foundations in recent years have a sagging length of about 20 to 30 mm and a sagging length of about 70 mm.
- the present inventor quantitatively evaluated the inclusion of the cosmetics by the absorption depth described later, and quantitatively evaluated the performance of stretching on the skin by the elongation area described later.
- the cosmetic sponge described in Patent Document 5 exhibits the above-mentioned excellent effects, but when used in a liquid-like foundation with low viscosity and low thixotropy, which has been desired in recent years, the absorption depth And it has been found that the elongation area is not at a sufficiently satisfactory level.
- the cosmetic filled in the pores on the sponge surface easily penetrates into the inner back, and the amount discharged when it extends on the skin is insufficient, resulting in a cosmetic effect. In some cases, it becomes insufficient.
- the present invention solves the above-mentioned problems of the prior art, and even when used for the application of cosmetics with low thixotropy and low viscosity as in the recent liquid-like foundation, the cosmetics can be applied to the inner depth of the sponge. It is an object of the present invention to provide a cosmetic sponge that does not easily permeate and has a moderate amount of cosmetic inclusion (depth of absorption) and that has a large stretched area and sufficiently satisfies recent requirements.
- Another object of the present invention is to provide a method for producing a polyurethane elastic body constituting a cosmetic sponge capable of obtaining an absorption depth and an elongation area that sufficiently satisfy recent requirements, and a cosmetic applicator using the cosmetic sponge.
- the inventor is a polyurethane continuous pore elastic body (polyurethane foam) having a three-dimensional membrane structure, having an ethanol permeation time within a predetermined range, and a pore diameter (maximum diameter) of 15 ⁇ m or more, Even when a polyurethane elastic body containing a large amount of pores of 75 ⁇ m or less and having a density within a predetermined range is used for a low-viscosity liquid foundation with low thixotropy, an absorption depth and an elongation area that sufficiently satisfy recent requirements can be obtained. And the present invention was completed.
- the present invention A continuous pore elastic body having a three-dimensional membrane structure,
- the ethanol permeation time is in the range of 10 seconds or more and less than 400 seconds,
- the maximum diameter is 150 ⁇ m or more, including 150 or more pores, the maximum diameter is more than 150 ⁇ m including 10 or less pores, the maximum diameter is 15 ⁇ m or more,
- a cosmetic sponge comprising a polyurethane elastic body having a pore number of 75 ⁇ m or less and a maximum diameter of 15 ⁇ m or more and 80% or more of the number of pores of 150 ⁇ m or less and an apparent density of 120 to 200 kg / m 3. (Claim 1).
- the present invention also provides the cosmetic sponge according to claim 1 (Claim 2), wherein the pores of the polyurethane elastic body have a substantially circular or elliptical cross-sectional shape.
- the present invention also provides A step of kneading a water-coagulable polyurethane, a solvent, a water-soluble inorganic salt powder, and a composition mainly comprising a surfactant of less than HLB 8.6 to obtain a kneaded product, Defoaming the kneaded product to obtain a defoamed kneaded product, Molding the defoamed kneaded product to obtain a molded product, A step of throwing the molded product into water or an aqueous solution to solidify the molded product, Elution and removal of the inorganic salt from the coagulum with water, and elution and removal after the removal,
- the water-soluble inorganic salt particles are 10% by mass or less of a particle group having a particle size of less than 15 ⁇ m, 35 to 85% by mass of a particle group having a particle size of 15 ⁇ m or more and less than 75 ⁇ m, a particle size of 75 ⁇ m or more,
- the present invention further provides a cosmetic applicator (Claim 4) using the cosmetic sponge according to Claim 1 or Claim 2.
- the cosmetic sponge of the present invention has pores whose diameter and number are controlled, and has a resin film and an opening between adjacent pores, and the area ratio of the resin film to the opening is within an appropriate range. 3D membrane structure in Breathability and liquid permeability are obtained, and thixotropy and low-viscosity cosmetics are included (adhesion amount on the cosmetic sponge). Even cosmetics with low viscosity are less likely to penetrate into the inner part of the sponge, so there is no drawback that the cosmetics easily penetrate the mesh. Moreover, when the cosmetic sponge of the present invention is used as an applicator, a large stretched area can be obtained smoothly. Furthermore, it has an excellent property that the resilience is not strong and has a soft and moist texture.
- the cosmetic sponge of the present invention even when it is used as a puff for a liquid-like foundation having low thixotropy and low viscosity, which has been desired in recent years, it has an absorption depth and an elongation area that sufficiently satisfy recent requirements. Obtainable.
- a polyurethane resin continuous pore elastic body (polyurethane elastic body) having a three-dimensional membrane structure and pores with controlled diameters and numbers can be obtained without requiring a complicated production process.
- the obtained polyurethane elastic body becomes the above-described cosmetic sponge of the present invention having excellent characteristics for use in cosmetics 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 or an eye shadow chip, and particularly suitable as a low-viscosity cosmetic, for example, a low-viscosity liquid foundation applicator. Used.
- FIG. 2 is a scanning electron micrograph of a cross section of the cosmetic sponge obtained in Example 1.
- FIG. 2 is a scanning electron micrograph of a cross section of a cosmetic sponge obtained in Example 2.
- FIG. 2 is a scanning electron micrograph of a cross section of a cosmetic sponge obtained in Comparative Example 1.
- 4 is a scanning electron micrograph of a cross section of a cosmetic sponge obtained in Comparative Example 2.
- 4 is a scanning electron micrograph of a cross section of a cosmetic sponge obtained in Comparative Example 3. It is a figure which shows the measuring instrument of ethanol permeation
- the continuous pore elastic body constituting the cosmetic sponge of the present invention is a polyurethane elastic body.
- 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 include polyether polyols such as polypropylene glycol, polytetramethylene glycol, and polymer polyol, polyester polyols such as adipate polyol and polycaprolactone polyol, polycarbonate polyol, polyolefin polyol, and the like. 10,000.
- chain extender examples include ethylene glycol, 1,4 butanediol, 1,6 hexanediol, 1,5 pentanediol, 3-methyl-1,5 pentanediol, 1,3 propanediol and the like.
- polyisocyanate compounds include aromatic isocyanates such as methylene diphenyl diisocyanate, tolylene diisocyanate, xylylene diisocyanate, naphthylene 1,5-diisocyanate, tetramethylene xylylene diisocyanate, and alicyclic isocyanates such as isophorone diisocyanate and dicyclohexylmethane diisocyanate.
- aliphatic isocyanates such as hexamethylene diisocyanate, dimer acid diisocyanate and norbornene diisocyanate.
- the cosmetic sponge of the present invention is characterized by comprising a continuous pore elastic body having a three-dimensional membrane structure.
- the three-dimensional membrane structure refers to a structure in which pores constituting a porous body are evenly distributed in the three-dimensional direction and are continuous with each other, but a part of the pores is a membrane. That is, the pore contact portion (the surface of the pore, the boundary with the adjacent pore) is formed by a resin film and a hole (opening) that connects the pores.
- the three-dimensional membrane structure is a structure different from the three-dimensional network structure in which the pores constituting the porous body are mutually continuous in the three-dimensional direction, but the membrane is hardly observed at the contact portion between the pores of the porous body. is there.
- the closed cell polyurethane foam composed of completely closed cells
- the surface of the cell (pore) is covered with a polyurethane resin film and has no opening.
- the three-dimensional membrane structure is different from a completely closed-cell polyurethane foam in that the pore surface is covered with a polyurethane resin membrane but has an opening.
- the inventor of the present invention has a sponge structure polyurethane foam (closed cell polyurethane foam) in which adjacent pores are separated by a membrane, and the pores are independent.
- the resilience is strong, and the texture is soft and moist. Is not obtained, and the amount of cosmetics (caking) is poor and the elongation on the skin is small.
- the polyurethane cosmetic sponge having a three-dimensional network structure as described in Patent Document 4 there is no gap between adjacent pores. Since there is no film on the skin, the cosmetics have the disadvantage that they tend to penetrate the mesh and have a small elongation on the skin.
- the pores adjacent to each other are partitioned by a membrane, and a three-dimensional membrane structure having openings in the membrane and a part of the pores is continuous, and the area ratio between the membrane and the openings is in an appropriate range.
- the cosmetic sponge of the present invention is characterized in that the ethanol permeation time is in the range of 10 seconds or more and less than 400 seconds.
- the ethanol permeation time varies depending on the average pore diameter, the pore size distribution, and the area ratio of the resin film occupying the contact portion between the pores, that is, the ratio of the ratio of the membrane between the pores and the opening.
- the three-dimensional membrane structure and the three-dimensional network structure are distinguished by the size ratio of the membrane portion and the opening portion that occupy the contact portion between the pores of the porous body.
- the permeation time is short and a three-dimensional membrane structure is obtained and the area ratio of the membrane is large, the ethanol permeation time is long.
- An ethanol permeation time of 10 seconds or more indicates a three-dimensional membrane structure and a membrane area ratio of a predetermined value or more.
- the inventor has found that the area ratio between the membrane part and the opening part strongly correlates with the ethanol permeation time. It is actually difficult to measure the area of the membrane part and the opening part using a micrograph or the like, and it is difficult to directly determine an appropriate range of the area ratio by the numerical value. Based on the measured values, it was found that a sponge having an appropriate area ratio between the membrane and the opening can be obtained.
- the cosmetic sponge with a three-dimensional membrane structure has pores formed by membranes and has membranes between the pores, so even a thixotropic or low-viscosity cosmetic does not easily penetrate into the inner part of the sponge.
- the pores of the three-dimensional film structure also have openings, it is easy to obtain an appropriate amount of cosmetics, and it is easy to obtain a large stretched area.
- membrane part and opening part exists in a moderate range, the outstanding cosmetic sponge which has a moderate absorption depth and a big elongation area is obtained.
- the sponge structure is more like a three-dimensional network structure, and the elongation area becomes small, which is not preferable.
- the penetration of the cosmetic is too fast and is absorbed in the inner part of the sponge, and especially in the case of a thixotropic and low viscosity cosmetic such as a liquid foundation, a problem of penetrating the sponge and adhering to the finger tends to occur.
- the ethanol permeation time is longer than 400 seconds, it is not preferable because the pores are seen in a film structure that is too small, and the absorption depth of the cosmetic becomes small. Further, the cosmetics are insufficiently contained and the cosmetics are not sufficiently stretched.
- the ethanol permeation time in the present invention is the time required for a certain volume of ethanol to permeate through a polyurethane elastic body (sponge: test piece) having a predetermined thickness and area. Specifically, the ethanol permeation time is as follows. Measured.
- the polyurethane continuous pore elastic body constituting the cosmetic sponge of the present invention comprises 150 or more pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less within the range of 1.0 mm ⁇ 1.0 mm of the cross section, and the maximum diameter is It includes 10 or less pores exceeding 150 ⁇ m, and the number of pores having a maximum diameter of 15 ⁇ m or more and 75 ⁇ m or less is 80% or more of the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less.
- the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less is less than 150 within the range of 1.0 mm ⁇ 1.0 mm of the cross section, the stretched area becomes small, which is not suitable as a cosmetic sponge.
- the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less is 200 or more within the range of 1.0 mm ⁇ 1.0 mm of the cross section.
- the maximum diameter is 15 ⁇ m or more and 75 ⁇ m or less and the maximum diameter is less than 80% of the number of pores of 15 ⁇ m or more and 150 ⁇ m or less, that is, when there are many pores of 75 ⁇ m or more and 150 ⁇ m or less, the absorption depth is large. Since the elongation area is too small, it is not suitable as a cosmetic sponge. Furthermore, even when the number of pores having a maximum diameter exceeding 150 ⁇ m exceeds 10, the absorption depth is too large and the stretched area becomes small, so that it is not suitable as a cosmetic sponge.
- the number of pores is a value measured by an electron micrograph of a cross section of a polyurethane continuous pore elastic body. That is, a micrograph is taken for a range of a cross section of a polyurethane elastic body of 1.0 mm ⁇ 1.0 mm, and the pore diameter (maximum diameter) on the micrograph is 15 ⁇ m or more and 75 ⁇ m or less. The pores of 150 ⁇ m or less and the pores exceeding 150 ⁇ m are counted. The number of pores extending inside and outside the measurement range is calculated as 0.5.
- the pore diameter means the maximum distance among the distances connecting the two points on the outer periphery of the pore as viewed on the micrograph.
- FIG. 8 is a diagram for explaining the pores of the continuous pore elastic body, and is a schematic diagram of a micrograph of the cut surface, but within the distance connecting two points A and B on the pore outer periphery in FIG.
- the maximum distance (L in FIG. 8) is called the maximum diameter.
- the cross-sectional shape of the pores often has a substantially circular or elliptical shape (claim 2).
- the shape is divided into a substantially circular or elliptical shape, and the number of the substantially circular or elliptical shape is defined as the number of pores.
- those having a protrusion at the center are divided into two or more pores having a substantially circular or elliptical shape, and the number of pores is counted.
- the hole a is classified into three holes a1, a2, and a3, and the hole b is classified into four holes b1, b2, b3, and b4.
- An optical microscope or an electron microscope is used as a microscope for taking a micrograph.
- the polyurethane continuous pore elastic body constituting the cosmetic sponge of the present invention is characterized by an apparent density of 120 to 200 kg / m 3 . Even if pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less satisfy the above conditions, the apparent density may exceed 200 kg / m 3 if there are too many pores having a maximum diameter of less than 15 ⁇ m. When the apparent density is less than 120 kg / m 3, the mechanical strength of the obtained sponge is extremely lowered, so that it tends to be unusable. When the apparent density exceeds 200 kg / m 3 , the sponge hardness becomes too high, so that it is not suitable for cosmetic use.
- the cosmetic sponge of the present invention having the above characteristics can be produced by the method for producing a polyurethane elastic body of the present invention. Next, this manufacturing method will be described.
- a water-coagulable polyurethane, a solvent, a water-soluble inorganic salt granule, and a blend mainly composed of a surfactant less than HLB 8.6 are kneaded, A step of obtaining a kneaded product is performed.
- the water coagulable polyurethane is a polyurethane which can be water coagulated.
- the polyurethane elastic body constituting the cosmetic sponge of the present invention is preferably formed from water-coagulable polyurethane. The preferred flexibility of the urethane foam is easily obtained by water coagulation.
- Water coagulation is not necessarily performed in water, but can also be performed in an aqueous solution.
- aqueous solution in which an inorganic salt or solvent is dissolved, the rate at which the polyurethane coagulates is moderated, preventing the generation of giant voids (voids far exceeding the pore generator particle size). is there.
- water-solidifying polyurethanes include those obtained by polymerizing a polyol component consisting of a high-molecular-weight polyol and a chain extender and a polyisocyanate compound in a solvent, but other polyurethanes polymerized without solvent. The thing which melt
- the water-coagulable polyurethane used in the production method of the present invention usually has a solid content of 30 ⁇ 5% by mass and a viscosity of 30 to 300 Pa ⁇ s (25 ° C., No. 6 rotor of BH viscometer). The solution of the measured value) is preferably used.
- a water-coagulable polyurethane having a viscosity of less than 30 Pa ⁇ s is used, the strength of the resulting cosmetic sponge may be insufficient. Further, when the viscosity exceeds 300 Pa ⁇ s, the kneaded material is difficult to flow and may take a long time for molding.
- the soft and moist touch that does not have strong resilience is generally expressed in hardness.
- the hardness suitable for the cosmetic sponge is in the range of 30 ° to 70 ° as measured with an Asker F type hardness tester. If the hardness is too low, for example, in the production of a cosmetic puff, there is a problem that the process of polishing the peripheral portion is too soft and difficult. On the other hand, when it is high, there is a problem that it feels bad because it hits the skin strongly.
- the hardness of the polyurethane continuous pore elastic body can be freely controlled by selecting a combination of a polyol component and a polyisocyanate compound usually used for synthesizing polyurethane and a mixing ratio. Also in the production method of the present invention, a cosmetic sponge within this preferred range can be obtained by appropriately selecting a polyol component and a polyisocyanate compound.
- 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 combinations thereof. .
- organic solvents such as dimethylformamide, dimethyl sulfoxide, dioxane, tetrahydrofuran, methylpyrrolidone, N-methylpyrrolidone, and combinations thereof.
- dimethylformamide is preferable in view of easiness of elution with water in the subsequent process, solvent odor as work environment, flammability and the like.
- the solvent may also be used to adjust the fluidity of the kneaded product.
- the amount of the solvent is preferably added in the range of 2 to 50 parts by mass with respect to 100 parts by mass in the case of a polyurethane solution (water-coagulating polyurethane) having a solid content of 30% by mass. If the addition amount is less than 2 parts by mass, the kneaded product may not flow easily, and it may take a long time for molding. If the addition amount exceeds 50 parts by mass, the strength of the resulting cosmetic sponge may be insufficient. is there.
- a granular material of a water-soluble inorganic salt is kneaded with a water-solidifying polyurethane and a solvent to obtain a kneaded product.
- a granular material of a water-soluble inorganic salt chlorides such as sodium and potassium, sulfates and the like can be used alone or in combination of two or more.
- a water-soluble inorganic salt powder kneaded with a water-coagulable polyurethane and a solvent has a particle group having a particle size of less than 15 ⁇ m, 10% by mass or less, and a particle size of 15 ⁇ m or more and less than 75 ⁇ m.
- the particle group has a particle size distribution of 35 to 85% by mass, a particle group having a particle size of 75 ⁇ m or more and 150 ⁇ m or less, 50% by mass or less, and a particle group having a particle size exceeding 150 ⁇ m has a particle size distribution of 10% by mass or less.
- the water-soluble inorganic salt powder is added in an amount of 100 to 2000 parts by mass, preferably 500 to 1500 parts by mass with respect to 100 parts by mass of polyurethane (value converted to solid content).
- a polyurethane elastic body having an apparent density of 120 to 200 kg / m 3 can be obtained by blending inorganic salt particles having the above particle size distribution in an addition amount within this range. Further, when the addition amount is 100 parts by mass or less, the inorganic salt is not connected and dispersed in the formulation, and thus a non-uniform sponge skeleton structure is formed. On the other hand, when the amount exceeds 2000 parts by mass, the mechanical strength of the obtained sponge is extremely lowered, and thus it tends to be unusable.
- the production method of the present invention is a process for obtaining a kneaded product by kneading a composition mainly composed of water-coagulable polyurethane, a solvent, and a water-soluble inorganic salt powder. It is characterized by coexisting less than 6 surfactants. By coexisting a surfactant of less than HLB 8.6, the resulting polyurethane elastic body tends to have a three-dimensional membrane structure.
- the cosmetic sponge tends to have a three-dimensional network structure.
- a surfactant having an HLB of 8.2 or less is used, and in this case, a three-dimensional film structure is likely to be obtained.
- the HLB value is a well-known index indicating the balance between the hydrophilicity and hydrophobicity of the surfactant, and the method for obtaining it is described in Michinori Oki et al., Chemical Dictionary published by Tokyo Chemical Doujin, page 178, etc. Has been.
- the surfactant is a fatty acid ester, it is calculated according to the following formula.
- HLB 20 ⁇ ⁇ 1- (SV / NV) ⁇
- SV is the saponification value of ester
- NV is the neutralization value of fatty acid.
- the addition amount of the surfactant having an HLB value in the range of less than 8.6 is preferably in the range of 5 to 45 parts by mass with respect to 100 parts by mass of polyurethane (value converted to solid content).
- the cosmetic sponge tends to have a three-dimensional network structure.
- the addition amount exceeds 45 parts by mass, the polyurethane elastic body has a three-dimensional film structure.
- the addition amount is too large, stickiness is felt when touched with a finger, which is not preferable.
- sorbitan fatty acid esters include sorbitan sesquioleate (3.7), sorbitan monooleate (4.3), sorbitan monostearate (4.7), As beef tallow glyceride ethylene oxide adduct, for example, NK-3 (6.6) manufactured by Asahi Denka Kogyo Co., Ltd.
- polyglycerol fatty acid ester examples include diglycerol monolaurate (8.5), diglycerol monopalmitate (7.3), diglycerol monostearate (6.9), and tetraglycerol tristearate (4 .7), tetraglycerol pentastearate (2.7), hexaglycerol tristearate (6.5), hexaglycerol pentastearate (4.2), decaglycerol pentastearate (6.4) ), Decaglycerin heptearic acid ester (4.3), decaglycerin octastearic acid ester (4.3), decaglycerin decastearic acid ester (3.4), decaglycerin heptabehenic acid ester (4.2) ), Decaglycerin Cabehhenic acid ester (2.3), diglycerin monooleic acid ester (6.9), diglycerin sesquioleic acid ester (4.9), diglycerin dioleic
- water-soluble polymer can be added to make the kneaded material more fluid.
- the water-soluble polymer is preferably one that is soluble in a solvent, and examples thereof include synthetic products such as polyvinyl alcohol, semi-synthetic products such as methyl cellulose and carboxymethyl cellulose, and natural products such as polymer polysaccharides.
- surfactants with a HLB of less than 8.6 are also added within the range that does not detract from the spirit of the invention in order to make the resulting polyurethane elastic body hydrophilic. May be.
- functional materials such as colorants, antioxidants, antifungal agents, antibacterial agents, materials that exhibit various lubricant functions, flame retardants, and conductive materials such as carbon black may be added as necessary. .
- a kneader for the kneading of the blend, a kneader, an auger kneader, a Banbury mixer, a screw extruder, or the like is used.
- the resulting kneaded material is defoamed and molded.
- the purpose of defoaming is to remove air bubbles in the composition, and the method of defoaming and molding is not particularly limited, but more specifically, for example, defoaming using a vented extruder is performed.
- a method of connecting a molding die (T die) to the extruder and shaping into a desired shape is preferably exemplified.
- the molded body is poured into water or an aqueous solution to replace the solvent with water to precipitate polyurethane and perform water coagulation.
- the mode until the molded body is charged is not particularly limited.
- the punched metal made of stainless steel 304 or the like is used to extrude and fill the kneaded material into a box-like shape whose upper surface is opened. This can be done by pouring into water or an aqueous solution.
- water-soluble inorganic salts are extracted and removed.
- a specific method for this purpose for example, after the molded product of the kneaded material contained in the container is left in warm water to extract most of the inorganic salts soluble in water, An example is a method in which a compact is charged and washed with water at 20 to 80 ° C. for about 15 to 90 minutes, and water is exchanged several times during the washing.
- the molded body thus obtained is dried.
- drying is preferably performed at 110 ° C. or lower. Drying can be performed using a box-type dryer, a tumbler-type dryer or the like. In this way, a polyurethane elastic body having a three-dimensional membrane structure is obtained.
- the cosmetic When a low-viscosity cosmetic such as a liquid foundation is adhered to the surface of the cosmetic sponge obtained from the polyurethane elastic body of the present invention thus obtained, the cosmetic has a low viscosity, so Accumulated instantly.
- the foundation In the case of a structure in which the sponge is a continuous pore elastic body and no film is formed between the pores (three-dimensional network structure), the foundation is easily absorbed into the inner pores of the sponge because it is easily transferred to the adjacent pores.
- the foundation in the case of a cosmetic sponge having a three-dimensional membrane structure, the foundation is not formed in the sponge because there is a film between adjacent pores. After being stored near the surface, it is hindered from moving to the adjacent inner pores, staying at the surface layer of the sponge, and the above problem is suppressed.
- the cosmetic sponge of the present invention is more effective than conventional cosmetic sponges, and sufficiently exhibits this effect even in cosmetics and liquid foundations having lower viscosity and less thixotropy.
- the cosmetic sponge manufactured by water coagulation satisfies the flexibility as a cosmetic sponge.
- the cosmetic sponge of the present invention does not have a strong impact resilience, has a soft and moist feel, does not have the disadvantage that the cosmetic penetrates, has an appropriate cosmetic content (absorption depth), and has a large elongation. Has an area. Therefore, this cosmetic sponge is used in cosmetic applicators such as foundation puffs and eye shadow chips.
- the present invention also provides a cosmetic applicator characterized by using the cosmetic sponge (polyurethane elastic body) in addition to the cosmetic sponge and the method for producing the polyurethane elastic body used for forming the cosmetic sponge ( Claim 4).
- Evaluation method [micrograph: number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less]
- the cosmetic sponge was cut, and a micrograph of the cut surface was taken using a scanning electron microscope JSM5500LV manufactured by JEOL. Measure the number of pores with a maximum diameter of 15 ⁇ m or more and 75 ⁇ m or less, and the number of pores with a maximum diameter of more than 75 ⁇ m and 150 ⁇ m or less on a micrograph of 50 to 400 times. Converted to a number.
- a foundation with a sag length of 23 mm was used.
- a 10 mm square cut out film is adhered to a horizontal transparent film (KOKUYO recycled OHP film VF-1300N) with double-sided tape.
- the above foundation is put into this cutout part (10 ⁇ 10 ⁇ 0.2 mm) using a syringe, the foundation is scraped off with a thin metal plate (straight ruler: KOKYO PRO TZ-RS15), and the surface is flattened. Wipe off the excess foundation adhering to the surface with a cotton swab.
- a 2 cm square sample (sponge) having a thickness of 8 mm is placed thereon.
- a 500 g weight is placed on this and removed within 1 second.
- the sponge is cut vertically with a sharp scissors, and the depth of the cosmetic material absorbed in the sponge is measured with a straight ruler.
- the measurement temperature is 22 to 28 ° C.
- a SUS304 plate having a thickness of 0.75 mm and a 2 cm square is bonded to a 2 cm square sample (sponge) having a thickness of 8 mm with a double-sided tape. Thereafter, the foundation is adhered to the sample (sponge) in the same manner as in the case of measuring the absorption depth. Place the sample after foundation adhesion on graph paper (Kokuyoho-14N B4, 1 mm grid (240 ⁇ 340)), place your finger on the SUS surface and press evenly so that the sponge thickness is about 4 mm. The spread area of cosmetics (cm 2 ) was measured. The measurement temperature is 22 to 28 ° C.
- FIG. 7 shows a cross-sectional view of the glass tube plugged.
- the hole is made of an elastic body (sponge: test piece) sliced to a thickness of 4.0 mm, and a fixture (shown in a sectional view and a plan view in FIG. 7B) is provided.
- FIG. 7C shows a state after the hole is closed with the elastic body. Further, a polyethylene film is applied from the outside of the elastic body and is sealed by pressing with a finger.
- a position at a height of 30 mm from the bottom in the glass tube is a lower scale, and a position at 130 mm is an upper scale.
- the polyethylene film is removed and the ethyl alcohol is poured off.
- the time from when the upper end of ethyl alcohol passes the upper scale until it passes the lower scale is defined as the ethanol permeation time.
- the measurement temperature is 22 to 28 ° C.
- Example 1 The raw materials used for the production of the polyurethane elastic body (cosmetic sponge) are shown below.
- ⁇ F-151 polyurethane manufactured by Fushimi Pharmaceutical Co., Ltd., solid content 30%
- T-191 polyether polyurethane manufactured by Fushimi Pharmaceutical Co., Ltd., solid content 30%
- mass-dimethylformamide 15 parts by mass-Sorgen 30 Sorbitan sesquioleate HLB value 3.7 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
- neutral anhydrous sodium sulfate B sold by Fushimi Pharmaceutical Co., Ltd. 400 parts by weight
- neutral anhydrous sodium sulfate B has the particle size distribution shown in Table 1 and FIG.
- the particle size distribution of neutral anhydrous sodium sulfate used in other examples and comparative examples is also shown in Table 1 and FIG.
- neutral anhydrous mirabilite is abbreviated as mirabilite.
- the above raw materials (total amount of about 20 kg) were put into a 30 L kneader whose temperature was adjusted to 40 ° C. and kneaded for 30 minutes at a rotation speed of 15 rpm. This was extruded at a set temperature of 40 ° C. while degassing under reduced pressure from a vent type extruder equipped with a T die having an inner size of 300 ⁇ 20 mm.
- the extruded molded product was filled into a box-shaped container made of SUS304 punching metal and having an inner surface width of 300 ⁇ length of 600 ⁇ height of 30 mm. This was immersed in water at 50 ° C. for 24 hours to replace dimethylformamide with water, and so-called water coagulation was performed.
- the molded product was taken out of the container, put into a household washing machine, and washed with 50 ° C. water. Then, it dried over 8 hours at 100 degreeC using the box-type dryer.
- the upper and lower portions of the sponge thus obtained were removed with a splitting machine to obtain 8 and 4 mm thick cosmetic sponges.
- a part of this sponge is cut out and a scanning electron micrograph of its cross section (cut surface) is taken.
- the pore diameter maximum diameter
- the number of pores is larger than 75 ⁇ m, and 150 ⁇ m.
- the number of pores below and the number of pores exceeding 150 ⁇ m were measured.
- apparent density, tensile strength and elongation rate, hardness, absorption depth, elongation area, and ethanol permeation time were measured by the above evaluation methods.
- a scanning electron micrograph is shown in FIG. 2, and each measurement result is shown in Table 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 the mirabilite B was used in place of the mirabilite C having a particle size distribution shown in Table 1 and FIG. 1 (sold by Fushimi Pharmaceutical Co., Ltd.). Similarly, the number of pores having a pore diameter (maximum diameter) of 15 ⁇ m or more and 75 ⁇ m or less, the number of pores larger than 75 ⁇ m and 150 ⁇ m or less, and the number of pores exceeding 150 ⁇ m were measured, and the apparent density, tensile strength and elongation rate were measured. , Hardness, absorption depth, stretch area, and ethanol permeation time were measured. A scanning electron micrograph is shown in FIG. 3, and each measurement result is shown in Table 2. As shown in FIG. 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 the mirabilite B was used in place of the mirabilite A having a particle size distribution shown in Table 1 and FIG. 1 (sold by Fushimi Pharmaceutical Co., Ltd.). Similarly, the number of pores having a pore diameter (maximum diameter) of 15 ⁇ m or more and 75 ⁇ m or less, the number of pores larger than 75 ⁇ m and 150 ⁇ m or less, and the number of pores exceeding 150 ⁇ m were measured, and the apparent density, tensile strength and elongation rate were measured. , Hardness, absorption depth, stretch area, and ethanol permeation time were measured. A scanning electron micrograph is shown in FIG. 4 and each measurement result is shown in Table 2.
- a polyurethane elastic body was obtained in the same manner as in Example 1 except that the mirabilite B was used in place of the mirabilite R-15.
- the sponge after drying shows obvious shrinkage, the length is 69% compared to the dimension usually obtained, and the F-type hardness reaches the upper limit of 100, which cannot be used as a cosmetic sponge. Met.
- Example 2 In the same manner as in Example 1, the number of pores having a pore diameter in the range of 15 ⁇ m or more and 75 ⁇ m or less, the number of pores greater than 75 ⁇ m and 150 ⁇ m or less, and the number of pores exceeding 150 ⁇ m were measured, and the apparent density, tensile strength, and elongation were measured. The rate, hardness, absorption depth, elongation area, and ethanol permeation time were measured. A scanning electron micrograph is shown in FIG.
- Example 3 Using mirabilite B as a raw material, mirabilite RX obtained by cutting 75 ⁇ m or less with a sieve was used. A polyurethane elastic body was obtained in exactly the same steps as in Example 1 except that the mirabilite B was used in place of the mirabilite RX, and the number of pores having a pore diameter in the range of 15 ⁇ m to 75 ⁇ m in the same manner as in Example 1. The number of pores larger than 75 ⁇ m and not more than 150 ⁇ m and the number of pores exceeding 150 ⁇ m were measured, and the apparent density, tensile strength and elongation, hardness, absorption depth, stretched area, and ethanol permeation time were measured. A scanning electron micrograph is shown in FIG. 6, and each measurement result is shown in Table 2.
- the mirabilite R-15 containing a particle group having a particle size of less than 15 ⁇ m far exceeds 10% by mass (about 80% by mass) and does not contain a particle group exceeding 75 ⁇ m.
- a cosmetic sponge having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less is much smaller than 150 and the apparent density is much larger than 200 kg / m 3. It has been.
- This cosmetic sponge has a three-dimensional membrane structure (from an SEM photograph), but the ethanol permeation time exceeds 400 seconds.
- the absorption depth is small and the cosmetics are not sufficiently contained, and the elongation area is also small, which is a performance unsuitable for a cosmetic sponge and does not satisfy the recent demands. From this result, it is shown that a porous body suitable for cosmetics cannot be obtained when using mirabilite containing a particle group having a particle diameter of less than 15 ⁇ m in an amount exceeding 10 mass%.
- the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less is smaller than 150, and the number of pores having a maximum diameter of 15 ⁇ m or more and 75 ⁇ m or less is 50% or less of the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less.
- a cosmetic sponge is obtained.
- This cosmetic sponge has a problem that the depth of absorption of the foundation is too large, and the cosmetic is pushed into the pores of the mesh (hole) and absorbed into the inner part of the sponge, penetrating the sponge and sticking to the finger. It is easy and has a small elongation area, that is, performance unsuitable for a cosmetic sponge, and does not satisfy recent demands.
- Comparative Example 3 which was performed in the same manner as in Example 1 except that the mirabilite RX was obtained by cutting (with a sieve) a particle size of mirabilite B of 75 ⁇ m or less, the number of pores having a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less was 150.
- a cosmetic sponge having a pore size smaller than the number of pores having a maximum diameter of 15 ⁇ m or more and 75 ⁇ m or less and a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less is obtained.
- the ethanol permeation time of this cosmetic sponge is less than 10 seconds.
- This cosmetic sponge has a large absorption depth, a small stretch area, and an insufficient amount of cosmetics, and is unsuitable for a cosmetic sponge, and does not meet recent demands.
- the amount permeated through the sieve when cut with the above sieve (that is, the amount of particles of 15 ⁇ m or more and 75 ⁇ m or less if calculated based on the particle size distribution of sodium sulfate B in Table 1 with a particle size of 75 ⁇ m or less)
- the elastic layer was obtained in the same manner as in Example 1 except that a shrinkage phenomenon was observed in the dried sponge, and the F-type hardness was 100.
- a soft porous material suitable for the above was not obtained.
- a particle group having a particle size of less than 15 ⁇ m is 10% by mass or less
- a particle group having a particle size of 15 ⁇ m or more and 75 ⁇ m or less is 35 to 85% by mass (preferably 35 to 55% by mass)
- a particle size exceeding 75 ⁇ m and 150 ⁇ m or less is a particle group having a particle size of less than 15 ⁇ m.
- the ethanol permeation time was 10 seconds or more, The number of pores with a maximum diameter of 15 ⁇ m or more and 75 ⁇ m or less including 150 or more pores with a maximum diameter of 15 ⁇ m or more and 150 ⁇ m or less within the range of 1.0 mm ⁇ 1.0 mm of the cross section within a range of less than 400 seconds
- a polyurethane elastic body having a three-dimensional membrane structure having a maximum diameter of 80% or more of the number of pores of 15 ⁇ m or more and 150 ⁇ m or less and an apparent density of 120 to 200 kg / m 3 is obtained.
- This sponge elastic sponge has an appropriate range of absorption depth, has a large elongation area, can be suitably used for the application of a liquid foundation with low viscosity and low thixotropy, It was to satisfy.
- Example 3 The front and back skin layers of the polyurethane elastic body obtained in Example 1 were removed by a splitting machine to obtain a sponge body having a thickness of 8 mm.
- the sponge body was cut with a Thomson blade and polished with a rotating grindstone to obtain a cosmetic applicator (cosmetic puff) having a thickness of 8 mm and a diameter of 60 mm.
- the cosmetic sponge of the present invention is suitably used as an applicator for low-viscosity cosmetics such as a liquid foundation in recent years.
- the polyurethane elastic body manufactured by the method of this invention is used suitably for formation of the cosmetic sponge of this invention.
- carbon blacks such as acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd.) and ketjen black (manufactured by Ketjen Black International Co., Ltd.), metal powder, metal oxide, carbon fiber, metal fiber, metal coat If fibers, graphite, metal flakes, etc. are blended in the step of obtaining a kneaded product, the medium to high conductivity required for ESD safety (for example, surface resistivity of 10 4 to 10 10 ⁇ / sq) is obtained.
- This polyurethane elastic body imparted with conductivity is suitable for rolls, wipers, swabs, and the like for the purpose of removing static electricity such as magnetic heads, magnetic recording media, printed wiring boards, and liquid crystal substrates. It is.
- a high HLB surfactant is blended in the step of obtaining a kneaded product, excellent water absorption can be imparted, and the polyurethane elastic body imparted with this water absorptivity is used as a chemical for precision instruments and electronic parts. It is also suitable for water-absorbing sponge and scrub cleaning in the water cleaning after the treatment process.
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Abstract
Description
3次元膜構造の連続気孔弾性体であって、
エタノール透過時間が10秒以上、400秒未満の範囲であり、
その断面の1.0mm×1.0mmの範囲内に、最大径が15μm以上、150μm以下の気孔を150個以上含み、最大径が150μmを超える気孔を10個以下含み、最大径が15μm以上、75μm以下の気孔数が最大径が15μm以上、150μm以下の気孔数の80%以上であり、かつ見掛密度が120~200kg/m3であるポリウレタン弾性体よりなることを特徴とする化粧用スポンジ(請求項1)である。
水凝固性ポリウレタン、溶剤、水溶性の無機塩の粉粒体、及びHLB8.6未満の界面活性剤を主成分とする配合物を混練し、混練物を得る工程、
前記混練物を脱泡して脱泡混練物を得る工程、
前記脱泡混練物を成形して成形物を得る工程、
前記成形物を、水中又は水溶液中に投入して凝固させ凝固物を形成する工程、
前記凝固物から前記無機塩を水に溶出させて除去する工程、及び
前記溶出、除去の後、乾燥する工程を有し、
前記水溶性の無機塩の粉粒体が、粒径が15μm未満の粒子群を10質量%以下、粒径が15μm以上で75μm未満の粒子群を35~85質量%、粒径が75μm以上、150μm以下の粒子群を50質量%以下、粒径が150μmを越える粒子群が10質量%以下の粒度分布を有することを特徴とするポリウレタン弾性体の製造方法(請求項3)を提供する。
通気性と液透過性が得られ、チクソ性や粘度の低い化粧料の含み(化粧用スポンジへの付着量)が適度であり、
粘度の低い化粧料でもスポンジの内奥部まで浸透しにくく、従って化粧料が網目を貫通しやすいという欠点もない。又、本発明の化粧用スポンジを塗布具として使用すると滑らかに大きな伸び面積が得られる。更に、反発弾性が強くなく、柔軟でしっとりした肌触りの風合いを有するとの優れた性質を併せて備える。すなわち、本発明の化粧用スポンジによれば、近年望まれているようなチクソ性や粘度の低いリキッド状ファウンデーション用のパフ等として使用する場合でも、近年の要請を充分満たす吸収深度及び伸び面積を得ることができる。
本発明の化粧用スポンジを構成する連続気孔弾性体は、ポリウレタンの弾性体である。 ポリウレタンは、高分子量ポリオールと鎖伸長剤からなるポリオール成分とポリイソシアネート化合物を反応させて得られるものである。高分子量ポリオールとしては、ポリプロピレングリコール、ポリテトラメチレングリコール、ポリマーポリオール等のポリエーテル系ポリオール、アジペート系ポリオール、ポリカプロラクトンポリオール等のポリエステル系ポリオール、ポリカーボネートポリオール、ポリオレフィンポリオール等があり、望ましい分子量は500~10000である。また、鎖伸長剤としては、エチレングリコール、1,4ブタンジオール、1,6ヘキサンジオール、1,5ペンタンジオール、3-メチル-1,5ペンタンジオール、1,3プロパンジオール等がある。ポリイソシアネート化合物としては、メチレンジフェニルジイソシアネート、トリレンジイソシアネート、キシリレンジイソシアネート、ナフチレン1,5-ジイソシアネート、テトラメチレンキシリレンジイソシアネート等の芳香族系イシシアネート、イソホロンジイソシアネート、ジシクロヘキシルメタンジイソシアネート等の脂環系イソシアネートおよびヘキサメチレンジイソシアネート、ダイマー酸ジイソシアネート、ノルボルネン・ジイソシアネート等の脂肪族系イソシアネート等がある。
「長さが300mm、内径が17.4mmのガラス管を縦置きにしておき、これの底部にΦ6.8mmの穴が開いた栓をし、この穴を4.0mm厚みにスライスしたポリウレタン弾性体(スポンジ:試験片)で塞ぐ。さらに、この弾性体の外側からポリエチレンフィルムを当てて指で押さえて密封する。ガラス管内の底部から高さ30mmの位置を下目盛りとし、130mmの位置を上目盛りとする。この上目盛り以上までエチルアルコールを注入した後、上記ポリエチレンフィルムを取り外して、エチルアルコールを流し落とす。エチルアルコールの上端が、上目盛りを通過してから下目盛りを通過するまでの時間をエタノール透過時間とする。測定温度は22~28℃である。」
エタノール透過時間は、好ましくは、20秒以上、350秒未満である、
ここで、SVはエステルのケン化価、NVは脂肪酸の中和価である。
ソルビタン脂肪酸エステルとして、例えばソルビタンセスキオレエート(3.7)、ソルビタンモノオレエート(4.3)、ソルビタンモノステアレート(4.7)等、
牛脂グリセライドエチレンオキサイド付加物として、例えば旭電化工業(株)製のNK-3(6.6)等、
ポリグリセリン脂肪酸エステルとして、例えばジグリセリンモノラウリン酸エステル(8.5)、ジグリセリンモノパルミチン酸エステル(7.3)、ジグリセリンモノステアリン酸エステル(6.9)、テトラグリセリントリステアリン酸エステル(4.7)、テトラグリセリンペンタステアリン酸エステル(2.7)、ヘキサグリセリントリステアリン酸エステル(6.5)、ヘキサグリセリンペンタステアリン酸エステル(4.2)、デカグリセリンペンタステアリン酸エステル(6.4)、デカグリセリンヘプタステアリン酸エステル(4.3)、デカグリセリンオクタステアリン酸エステル(4.3)、デカグリセリンデカステアリン酸エステル(3.4)、デカグリセリンヘプタベヘニン酸エステル(4.2)、デカグリセリンデカベヘニン酸エステル(2.3)、ジグリセリンモノオレイン酸エステル(6.9)、ジグリセリンセスキオレイン酸エステル(4.9)、ジグリセリンジオレイン酸エステル(3.7)、ジグリセリンテトラオレイン酸エステル(1.5)、テトラグリセリンペンタオレイン酸エステル(2.7)、ヘキサグリセリンペンタオレイン酸エステル(4.2)、デカグリセリンテトラオレイン酸エステル(7.6)、デカグリセリンペンタオレイン酸エステル(6.4)、デカグリセリンヘキサオレイン酸エステル(5.6)、デカグリセリンヘプタオレイン酸エステル(4.9)、デカグリセリンオクタオレイン酸エステル(4.3)、デカグリセリンデカオレイン酸エステル(3.4)、デカグリセリンノナエルカ酸エステル(3.2)、ジグリセリンモノイソパルミチン酸エステル(7.3)、ジグリセリンモノイソステアリン酸エステル(6.9)、ジグリセリンジイソステアリン酸エステル(3.7)、ジグリセリントリイソステアリン酸エステル(2.3)、ジグリセリンテトライソステアリン酸エステル(1.5)、トリグリセリンジイソステアリン酸エステル(5.3)等、
ポリエチレングリコールオレエートとして、例えば旭電化工業社製OEG-102(7.9)等、
特殊フェノールエトキシレートとして、例えば旭電化工業社製PC-1(4.2)等を挙げることができる。ここで括弧内の数値は、HLB値を表す。
[顕微鏡写真:最大径が15μm以上、150μm以下の気孔数]
化粧用スポンジを切断し、その切断面の顕微鏡写真を、日本電子社製の走査型電子顕微鏡JSM5500LVを用いて撮影した。50倍ないし400倍の顕微鏡写真上で、最大径が15μm以上、75μm以下の気孔数、最大径が75μmより大きく150μm以下の気孔数を測定し、1.0mm×1.0mmの切断面当たりの数に換算した。
[引張強度及び伸長率] JIS K 6400-5に準拠して測定した。
[硬度] 高分子計器社製のアスカーゴム硬度計F型を用いて測定した。
シリンジを使ってファウンデーションを、水平に置いた透明フィルム(KOKUYO再生OHPフィルムVF-1300N)上に0.11~0.13g乗せ、そのフィルムを垂直に立てる。すると、チクソ性と粘度の低いファウンデーションは、下に垂れ始めるが、垂れが乾燥して固まるまで放置する(約24時間、22~28℃)。その後、ノギスで垂れた長さを測定し、垂れ長さとする。
垂れ長さが23mmのファウンデーションを使用した。水平な透明フィルム(KOKUYO再生OHPフィルムVF-1300N)の上に、10mm角の切り抜きをした同フィルムを両面テープで接着する。この切抜き部分(10×10×0.2mm)に、シリンジを使って、上記のファウンデーションを入れ、薄い金属板(直定規:KOKUYO PRO TZ―RS15)でファウンデーションをかき取って表面を平らにし、周辺に付着した余剰のファウンデーションを綿棒で拭取る。その後、その上に厚み8mmで2cm角の試料(スポンジ)を置く。この上に500gの分銅を乗せてから1秒以内に取り除く。この操作を10回繰り返した後、鋭利な鋏でスポンジを縦に裁断して、スポンジ内部に吸収された化粧料の深さを直定規で測定する。測定温度は22~28℃である。
厚み8mmで2cm角の試料(スポンジ)に、厚み0.75mmで2cm角のSUS304の板を両面テープで接着する。その後、試料(スポンジ)に、上記の吸収深度の測定の場合と同様にしてファウンデーションを付着させる。ファウンデーション付着後の試料を方眼紙上(コクヨ ホ-14N B4・1mm方眼(240×340))に置き、SUS面上に指を乗せてスポンジ厚みが略4mmになるよう均等に押さえて、化粧料を押し広げ、化粧料の広がり面積(cm2)を測定した。測定温度は22~28℃である。
長さが300mm、内径が17.4mmのガラス管を縦置きにしておき、これの底部にΦ6.8mmの穴が開いた栓をする。なお、このガラス管の栓がされた様子の断面図を図7に示す。この穴を、図7(b)に示すように、4.0mm厚みにスライスした弾性体(スポンジ:試験片)で、固定具(図7(b)にその断面図及び平面図を示す)を使用して塞ぐ。弾性体で穴を塞いだ後の様子を図7(c)に示す。さらに、この弾性体の外側からポリエチレンフィルムを当てて指で押さえて密封する。ガラス管内の底部から高さ30mmの位置を下目盛りとし、130mmの位置を上目盛りとする。高さ200mmまでエチルアルコールを注入した後、上記ポリエチレンフィルムを取り外して、エチルアルコールを流し落とす。エチルアルコールの上端が、上目盛りを通過してから下目盛りを通過するまでの時間をエタノール透過時間とする。測定温度は22~28℃である。
ポリウレタン弾性体(化粧用スポンジ)の製造に使用した原料を、以下に示す。
・F-151(伏見製薬所社製ポリエステル系ポリウレタン、固形分30%)
50質量部
・T-191(伏見製薬所社製ポリエーテル系ポリウレタン、固形分30%)
50質量部
・ジメチルホルムアミド 15質量部
・ソルゲン30(第一工業製薬社製ソルビタンセスキオレエートHLB値3.7)
4質量部
・中性無水芒硝B(伏見製薬所社販売) 400質量部
芒硝Bを、表1、図1に記載の粒度分布の芒硝C(伏見製薬所社販売)に代えて使用したこと以外は、実施例1と同様にしてポリウレタン弾性体を得、実施例1と同様にして、気孔径(最大径)が15μm以上、75μm以下の気孔数と、75μmより大きく、150μm以下の気孔数、及び150μmを超える気孔数を測定し、見掛密度、引張強度及び伸長率、硬度、吸収深度、伸び面積、及びエタノール透過時間を測定した。走査型電子顕微鏡写真を図3に、各測定結果を表2に記載した。図3に示されるように、得られた化粧用スポンジは3次元膜構造を有する。
芒硝Bを、表1、図1に記載の粒度分布の芒硝A(伏見製薬所社販売)に代えて使用したこと以外は、実施例1と同様にしてポリウレタン弾性体を得、実施例1と同様にして、気孔径(最大径)が15μm以上、75μm以下の気孔数と、75μmより大きく、150μm以下の気孔数、及び150μmを超える気孔数を測定し、見掛密度、引張強度及び伸長率、硬度、吸収深度、伸び面積、及びエタノール透過時間を測定した。走査型電子顕微鏡写真を図4に、各測定結果を表2に記載した。
芒硝C(伏見製薬所社販売)を、下記の粉砕分級機を使用して粉砕分級し、表1、図1に記載の粒度分布のR-15と呼ぶ芒硝を作製した。なお、R-15の粒度分布は、下記の粒度分布測定機を用いて測定した。実施例、比較例で使用した他の芒硝も同じである。
・粉砕分級機:ホソカワミクロン社製ACMパルペライザH型 型式:ACM-30H
・粒度分布測定機:Honewell社製 Microtrac HRA 型式9320-x100
芒硝Bを原料として、75μm以下を篩でカットして得た芒硝RXを使用した。芒硝Bを、芒硝RXに代え使用したこと以外は、実施例1と全く同じ工程でポリウレタン弾性体を得、実施例1と同様にして気孔径が15μm以上、75μm以下の範囲内にある気孔数、75μmより大きく150μm以下の気孔数、及び150μmを超える気孔数を測定し、見掛密度、引張強度及び伸長率、硬度、吸収深度、伸び面積、及びエタノール透過時間を測定した。走査型電子顕微鏡写真を図6に、各測定結果を表2に記載した。
実施例1で得られたポリウレタン弾性体の表側、裏側の表皮層を漉割り機により除去して、厚さ8mmのスポンジ体を得た。このスポンジ体をトムソン刃で裁断し、裁断面を回転する砥石で研磨して厚さ8mmで直径60mmの化粧料塗布具(化粧用パフ)を得た。
Claims (4)
- 3次元膜構造の連続気孔弾性体であって、
エタノール透過時間が10秒以上、400秒未満の範囲であり、
その断面の1.0mm×1.0mmの範囲内に、最大径が15μm以上、150μm以下の気孔を150個以上含み、最大径が150μmを超える気孔を10個以下含み、最大径が15μm以上、75μm以下の気孔数が最大径が15μm以上、150μm以下の気孔数の80%以上であり、かつ見掛密度が120~200kg/m3であるポリウレタン弾性体よりなることを特徴とする化粧用スポンジ。 - 前記ポリウレタン弾性体の気孔が略円形又は楕円形の断面形状を有することを特徴とする請求項1に記載の化粧用スポンジ。
- 水凝固性ポリウレタン、溶剤、水溶性の無機塩の粉粒体、及びHLB8.6未満の界面活性剤を主成分とする配合物を混練し、混練物を得る工程、
前記混練物を脱泡して脱泡混練物を得る工程、
前記脱泡混練物を成形して成形物を得る工程、
前記成形物を、水中又は水溶液中に投入して凝固させ、凝固物を形成する工程、
前記凝固物から前記無機塩を水に溶出させて除去する工程、及び
前記溶出、除去の後、乾燥する工程を有し、
前記水溶性の無機塩の粉粒体が、粒径が15μm未満の粒子群を10質量%以下、粒径が15μm以上で75μm未満の粒子群を35~85質量%、粒径が75μm以上で150μm以下の粒子群を50質量%以下、粒径が150μmを越える粒子群が10質量%以下の粒度分布を有することを特徴とするポリウレタン弾性体の製造方法。 - 請求項1又は請求項2に記載の化粧用スポンジを用いることを特徴とする化粧料塗布具。
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US10436349B2 (en) | 2015-06-09 | 2019-10-08 | Denso Corporation | Pressure reduction valve |
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KR102410295B1 (ko) * | 2016-06-17 | 2022-06-17 | 주식회사 엘지생활건강 | 화장용 스펀지 및 그 제작 방법 |
KR102383080B1 (ko) * | 2017-08-31 | 2022-04-05 | 코스맥스 주식회사 | 비수계 화장료 조성물이 함침된 스펀지를 포함하는 화장품 |
CN108164681B (zh) * | 2017-12-28 | 2020-10-23 | 山东一诺威聚氨酯股份有限公司 | 用于制作粉扑的低硬度聚氨酯弹性体组合物及其制备方法 |
JP6596710B2 (ja) | 2018-02-23 | 2019-10-30 | トーヨーポリマー株式会社 | ポリウレタン多孔質体およびポリウレタン多孔質体の製造方法 |
JP7361363B2 (ja) * | 2019-06-27 | 2023-10-16 | ピアス株式会社 | 化粧用組成物及び化粧品 |
KR20230078163A (ko) | 2021-11-26 | 2023-06-02 | 코오롱인더스트리 주식회사 | 폴리우레탄 폼 제조용 조성물, 이를 포함하는 폴리우레탄 폼 및 폴리우레탄 폼의 제조방법. |
KR20230078170A (ko) | 2021-11-26 | 2023-06-02 | 코오롱인더스트리 주식회사 | 폴리우레탄 폼 제조용 조성물, 폴리우레탄 폼 제조용 분산액, 이를 포함하는 폴리우레탄 폼 및 폴리우레탄 폼의 제조방법. |
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