Insole

Abstract

To provide an insole having a purification function.SOLUTION: An insole comprises: granular material containing thorium oxide and zirconium oxide; and a resin member that holds the granular material. The granular material contains 0.5-10 wt.% of thorium oxide and 30-60 wt.% of zirconium oxide. The resin member may be in the form of a sheet.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an insole with a cleaning function. [Background technology]

[0002] Conventionally, insoles with additional functions other than adjusting shoe size have been proposed. For example, Patent Document 1 proposes an insole that irradiates resonant electromagnetic waves of a specific frequency, turning itself into a transfer oscillator of the electromagnetic waves, thereby relieving pain and fatigue. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-10664 Summary of the Invention [Problem to be solved by the invention]

[0004] In addition to the functions of reducing pain and fatigue that directly affect the user, it is desirable to add functions such as deodorizing and antibacterial properties to the insole. The insole in Patent Document 1 does not provide at least such effects.

[0005] The present invention has been made in view of these problems, and has an object to provide an insole with a purification function. [Means for solving the problem]

[0006] The present invention has been made to solve at least part of the above-mentioned problems, and can be realized as the following application examples.

[0007] [Application example 1] The invention described in Application Example 1 is an insole comprising a powder containing thorium oxide and zirconium oxide, and a resin member that holds the powder, wherein the powder contains 0.5 to 10% by weight of thorium oxide and 30 to 60% by weight of zirconium oxide.

[0008] Although the mechanism behind this insole is not entirely clear, thorium oxide, which emits weak radiation, reacts with moisture in the air to generate OH radicals. These OH radicals then have the ability to inactivate viruses and bacteria and remove odorous components, achieving purifying functions. Furthermore, in recent years, attention has been focused on the antibacterial and deodorizing functions of far-infrared rays. Thorium oxide excites zirconium oxide to generate powerful far-infrared rays, which can be used to achieve the effects of these far-infrared rays. Therefore, the insole described above can achieve a high level of purifying effects.

[0009] [Application example 2] The invention described in Application Example 2 is the insole described in Application Example 1, wherein the resin member is a sheet-like member, and a plurality of protrusions are formed on one surface of the resin member. In such an insole, the protrusions form steps on the surface of the resin member, reducing the adhesion between the foot and the resin member, and therefore, it is possible to prevent excessive adhesion from hindering the movement of cluster ions and impeding the purification action.

[0010] [Application example 3] The invention described in Application Example 3 is the insole described in Application Example 2, further comprising an adhesive sheet disposed on the other surface of the resin member, which is different from the one surface. The adhesive sheet prevents such an insole from moving inside the shoe, preventing it from shifting from its proper position and reducing its effectiveness.

[0011] [Application example 4] The invention described in Application Example 4 is the insole described in Application Example 1, wherein the resin member is an acrylic urethane resin. In such an insole, the acrylic urethane resin can favorably retain powder particles, thereby preventing a decrease in the purification function due to loss of powder particles caused by deterioration over time.

[0012] [Application example 5] The invention described in Application Example 5 is the insole described in Application Example 4, wherein the resin member contains 5 to 30 parts by weight of the powder and granules per 100 parts by weight of acrylic urethane resin. Such an insole can fully exert an appropriate purification effect and a heat-retaining effect by far infrared rays. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1A is a schematic cross-sectional view showing an insole of an embodiment, and FIG. 1B is a schematic plan view of the insole of the embodiment. [Figure 2] FIG. 10 is a schematic cross-sectional view showing a modified insole. [Figure 3] FIG. 10 is a schematic cross-sectional view showing a modified insole. [Figure 4] FIG. 10 is a schematic cross-sectional view showing a modified insole. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments to which the present invention is applied will be described. Note that the embodiments of the present invention are not limited to the following embodiments, and various forms may be adopted as long as they fall within the technical scope of the present invention.

[0015] 1. Insole composition The insole of the present disclosure includes a resin sheet having functionality. As will be described later, the insole may include an adhesive sheet, a top sheet, a protrusion, and the like in addition to the resin sheet.

[0016] (1) Resin sheet composition The resin sheet of the present disclosure is a sheet-like member. The resin sheet includes a powder containing zirconium oxide (ZrO2) and thorium oxide (ThO2), and a resin member that holds the powder inside. The resin member is a sheet-like member, and the term "sheet-like" as used herein means a thin, expansive shape.

[0017] (1-1) Powder In addition to zirconium oxide and thorium oxide, the powder or granule may contain, for example, SiO2, P2O5, Al2O3, TiO2, Fe2O3, MgO, CaO, U3O8, rare earth oxides, etc. The average particle size of the powder or granule is not particularly limited, and it may be a granular or fine powder. For example, the average particle size (median diameter) of the powder or granule is about 1.0 μm, and nearly 100% of the particles are 8 μm or less.

[0018] The thorium oxide content in the powder is 0.5 to 10% by weight. Within this range, thorium oxide can effectively exhibit the purification effect described below. A content of 1% by weight or more is more effective. A content of 5% by weight or less allows for greater freedom in blending other components (e.g., ZrO2). The content of zirconium oxide in the powder is 30 to 60% by weight. Within this range, zirconium oxide can effectively exhibit the effects of far infrared rays, which will be described later. If the content is 40% by weight or more, the effect is even greater. If the content is 50% by weight or less, the degree of freedom in blending other components (e.g., ThO2) can be increased. If the content is 1.5 to 2% by weight of thorium oxide and 40 to 50% by weight of zirconium oxide, a good purification effect is exhibited. The amount of other components contained in the powder or granule is not particularly limited as long as the functions of zirconium oxide and thorium oxide are not impaired.

[0019] In these powders, thorium oxide, which emits weak radiation, reacts with moisture in the air to generate OH radicals. OH radicals attach to bacteria and organic matter, inactivating and decomposing them. This thorium oxide further excites zirconium oxide to generate powerful far-infrared rays, which can provide deodorizing, disinfecting, heat retention, and antioxidant effects.

[0020] (1-2) Base material layer The specific composition of the base material layer (resin member) is not particularly limited as long as it can hold the above-mentioned powder particles. If the base material layer has flexibility, it can improve the comfort of use as an insole. The base layer can be made of, but is not limited to, acrylic urethane resin, urethane resin, EVA resin, vinyl chloride resin, or the like. An acrylic urethane resin is a resin having a urethane bond and an acrylate. When using an acrylic urethane resin, a resin sheet containing 5 to 30 parts by weight of the above-mentioned powder particles per 100 parts by weight of the acrylic urethane resin can fully exhibit the effects of the above-mentioned powder particles and maintain appropriate strength. A blend of 10 parts by weight or more of the powder particles can exhibit sufficient effects, while a blend of 20 parts by weight or less has little effect on the strength and flexibility of the resin sheet. Even when other resins are used as the base layer, the above-mentioned amount of powder particles may be blended. The vinyl chloride resin may be, for example, a vinyl chloride sheet (PVC80MPLK white) manufactured by Lintec Corporation.

[0021] (2) Examples of specific forms 1A and 1B is formed to be detachable from (i.e., separate from) a shoe, for example. Of course, the insole may be configured integrally with the shoe. In the following description, a detachable insole 1 will be described.

[0022] In addition to the resin sheet 11, the insole 1 may also include an adhesive sheet 13 and a plurality of protrusions 15. As shown in FIG. 1B , the insole 1 may have a planar shape that matches the internal shape of the shoe beforehand. In this case, it becomes easier to attach the insole to the shoe. Of course, the shape does not have to match the shape of the shoe. For example, the insole may be configured to be sufficiently smaller than the midsole of the shoe (the surface that the insole comes into contact with) so that it can be placed in a desired position. Alternatively, the insole may be formed large beforehand so that the user can cut it as needed for use. Alternatively, the insole may be formed sufficiently smaller than the midsole of the shoe. In other words, the insole of the present disclosure is not particularly limited in terms of its specific planar shape, and may have various shapes that can be placed in the midsole of the shoe and used.

[0023] The insole 1 has a shape that includes the arch and forward portion, i.e., the portion from the base of the toes to the toes, excluding the heel portion. The insole 1 is also 1 mm thick overall. This shape allows for a high level of purification function in the forward portion of the foot, where odors tend to accumulate, and by being thin and only provided in the forward portion, it prevents a significant change in comfort and allows the insole to be worn without discomfort. If the insole 1 is 2 mm or less overall, discomfort can be sufficiently reduced, and if it is 0.5 mm or less, discomfort can be reduced even more effectively.

[0024] The adhesive sheet 13 is a sheet having an adhesive, and is disposed on one surface of the resin sheet 11. The adhesive sheet 13 prevents the midsole of the shoe (the surface that the insole comes into contact with) from shifting from the insole 1 during use. The composition of the adhesive is not particularly limited, but examples include adhesives such as acrylic adhesives, vinyl adhesives, vinyl acetate adhesives, polyvinyl acetal adhesives, vinyl chloride adhesives, cellulose adhesives, chloroprene adhesives, nitrile rubber adhesives, styrene rubber adhesives, silicone rubber adhesives, polysulfide adhesives, terpene resins, and water-soluble rosin.

[0025] Protrusions 15 are resin members provided on the surface of resin sheet 11 opposite adhesive sheet 13. Protrusions 15 are disk-shaped with a diameter of 0.5 to 2 mm and a height of 0.05 to 0.5 mm, and are arranged at intervals.

[0026] The resin sheet 11 can be produced by mixing powder and granular material into a resin material and then using a production method similar to that of a general production method for sheet-shaped resin. The manufacturing method of the insole 1 is not particularly limited, and various manufacturing methods can be used. For example, the above-mentioned portions may be bonded to each other. The protrusions may be formed by printing. When the insole is integrated with the inner sole of a shoe, the insole 1 may be attached to the surface of the inner sole.

[0027] FIG. 2 shows a modified insole 21. The insole 21 includes a surface sheet 23 on a resin sheet 11, with a protrusion 15 provided thereon. The surface sheet 23 can be made of a porous resin or cloth that has breathability. With this configuration, the surface sheet 23 is positioned on the outer side of the resin sheet 11, thereby improving functionality such as feel and breathability, and protecting the resin sheet 11.

[0028] Fig. 3 shows another modified insole 31. The insole 31 has the surface sheet 23 of Fig. 2, on which protrusions 33 are provided. Here, the protrusions 33 have the same components as the resin sheet 11, and are connected to the resin sheet 11 through holes provided in the surface sheet 23. With this configuration, it is possible to impart a purification function not only to the resin sheet 11 but also to the protrusions 33.

[0029] Fig. 4 shows another modified insole 41. The insole 41 does not have the resin sheet 11, but has the surface sheet 23 of Fig. 2, on which protrusions 43 are provided. Here, the protrusions 43 have the same components as the resin sheet 11. With this configuration, the protrusions 43 can exhibit a purification function.

[0030] The specific configuration of the insole is not limited to the above-described configurations. For example, the insole does not need to have a protrusion. However, if the insole has a protrusion, a step is formed on the surface of the resin member, which reduces the adhesion between the foot and the resin member, and therefore it is possible to prevent excessive adhesion from hindering the movement of cluster ions and impeding the purification action.

[0031] The insole does not necessarily have to be provided with an adhesive sheet. However, by providing an adhesive sheet, it is possible to prevent the insole from shifting from its proper position, thereby reducing its effectiveness, as the adhesive sheet will prevent movement inside the shoe.

[0032] 2. Working Example (1) Configuration of the test sample used in the evaluation test A test sample having the insole function of the present disclosure was prepared by mixing 15 parts by weight of the powder particles described below with 100 parts by weight of acrylic urethane resin. The thickness of the resin sheet was 0.5 mm.

[0033] The composition of the powder is as follows: The average particle size of the powder is approximately 1.0 μm, with almost 100% of the particles being 8 μm or smaller. ZrO246.0±2% SiO225.0±2% P2O57.0±1% Al2O3 3.0% or less TiO22.0% or less Fe2O3 1.0% or less MgO 0.5% or less CaO 1.0% or less ThO2 1.6±0.2% U3O80.1% or less Total rare earth oxides 16.0±1%

[0034] When the negative ions in the resin sheet, which was the test sample, were measured using a negative ion counter for ores, COM-3010PRO, manufactured by Com Systems Co., Ltd., the negative ions were measured in the range of 1000 to 2000 ions / cc.

[0035] (2) Deodorization test The deodorizing function of the test sample was confirmed by the acetic acid gas removal performance using a detector tube method in accordance with the method stipulated in the certification standard for deodorizing processed textile products (General Incorporated Association Textile Evaluation Technology Council). Specifically, the test sheet 100 cm 2 The odor reduction rate was measured after 3 L of test gas adjusted to 30 ppm was poured into a 5 L plastic bag and left for 2 hours. The odor reduction rate was calculated as follows: Odor reduction rate (%) = (Sb-Sm) / Sb x 100 Sb: average value of blank test Sm: average value of the measurements The test results are shown in Table 1.

[0036] [Table 1]

[0037] The test sample had a high odor reduction rate of over 98% compared to the blank. In other words, it was confirmed that the test sample has high acetic acid gas removal performance and has advanced deodorizing function.

[0038] (3) Antibacterial test The antibacterial function of the test sample was confirmed by a method based on the bacterial liquid absorption method specified in JIS L 1902. The antibacterial activity against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli was tested.

[0039] The test bacterial species used were Staphylococcus aureus NBRC 12732, Pseudomonas aeruginosa NBRC 3080, and Escherichia coli O157:H7 ATCC 43888. Tables 2 to 4 show the results of the antibacterial test.

[0040] [Table 2]

[0041] [Table 3]

[0042] [Table 4]

[0043] As can be seen from Tables 2 to 4, the test samples exhibited high bacteriostatic activity values ​​against all bacteria, and also exhibited high bactericidal activity values ​​of 3 or more against all bacteria. Thus, it was confirmed that the test samples had high antibacterial performance.

[0044] 3.Effects The insoles of the present disclosure can inactivate viruses and bacteria through cluster ions generated by thorium oxide reacting with moisture in the air, decompose and deodorize odorous components such as formaldehyde and acetic acid, and exhibit antifungal properties. Furthermore, the far infrared rays generated by zirconium oxide provide heat retention and antioxidant effects. Therefore, the insoles described above can achieve not only a high level of purification, but also the benefits of far infrared rays. Furthermore, by decomposing the odorous components generated by bacteria normally present on the soles of the feet, it is possible to inhibit the approach of organisms such as mosquitoes and other sanitary or nuisance pests that react to odorous components. [Explanation of symbols]

[0045] 1...insole, 11...resin sheet, 13...adhesive sheet, 15...projection, 21...insole, 23...surface sheet, 31...insole, 33...projection, 41...insole, 43...projection

Claims

1. A powder containing thorium oxide and zirconium oxide, a resin member for holding the powder or granular material, The insole comprises 0.5 to 10% by weight of the thorium oxide and 30 to 60% by weight of the zirconium oxide in the powder or granule.

2. 10. The insole according to claim 1, The resin member is a sheet-like member, The insole has a plurality of protrusions formed on one surface of the resin member.

3. 3. The insole according to claim 2, The insole comprises an adhesive sheet disposed on a surface of the resin member that is different from the one surface.

4. 10. The insole according to claim 1, The insole, wherein the resin member is an acrylic urethane resin.

5. 5. The insole according to claim 4, The resin member contains 5 to 30 parts by weight of the powder and granules per 100 parts by weight of the acrylic urethane resin.

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