JP7355495B2 - chemical warmer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chemical body warmer that is used by being disposed on at least a portion of the sole of the foot and can provide an excellent thermal effect to the whole body.

Conventional chemical body warmers (so-called disposable body warmers) utilize a heat generating mechanism in which oxidizable metals such as iron generate oxidation heat when they come into contact with oxygen, and the heat generating parts containing the oxidizable metals are made with moisture permeability. Those housed in a container with a container are commonly used.

Conventionally, various types of chemical body warmers have been developed in order to provide a convenient heating effect, depending on the area of application, such as types that can be held in the hand, types that can be placed in a pocket, and types that can be pasted on clothes or skin. There is. Furthermore, attempts have been made to improve the heating element and the housing in order to improve the heat generation properties and usability of chemical body warmers (see, for example, Patent Documents 1 and 2).

However, although conventional chemical body warmers can locally apply a thermal effect to the body area to which they are applied, locally applied chemical body warmers cannot provide a thermal effect to the entire body.

Japanese Patent Application Publication No. 2003-265513 Japanese Patent Application Publication No. 2007-61338

An object of the present invention is to provide a chemical body warmer that can provide a warming effect to the whole body even when used locally on body parts.

The inventors of the present invention conducted intensive studies to solve the above problem, and found that a heat generating part containing reduced iron powder as an oxidizing metal was used, and the heat generating part was made to have a moisture permeability of 650 to 1200 g/m ² ·day. By placing a chemical warmer housed in a container including a sheet on at least a portion of the sole of the foot, it provides a warming effect to the entire body, improving blood circulation not only in the sole of the foot but also in the hands, feet, shoulders, etc. was found to be promoted. The present invention was completed through further studies based on this knowledge.

That is, the present invention provides the inventions of the following aspects.
Item 1. A chemical warmer used by being placed on at least a part of the sole of the foot,
A heat generating part that generates heat that is transmitted to the sole of the foot;
a housing that houses the heat generating part and includes a moisture permeable sheet on at least one surface;
The heat generating part contains reduced iron powder, and the moisture permeability of the moisture permeable sheet is 650 to 1200 g/m ² ·day.
Chemical warmer.
Item 2. Item 2. The chemical body warmer according to item 1, wherein the heat generating part further contains an oxidation promoter and water.
Item 3. Item 3. The chemical body warmer according to Item 1 or 2, wherein the moisture permeable sheet is a laminated sheet of a breathable resin layer having pores and a fiber base material.
Item 4. 4. The chemical warmer according to any one of Items 1 to 3, wherein an adhesive layer is provided on one surface of the container.
Item 5. Item 5. The chemical body warmer according to any one of Items 1 to 4, which is used to impart a thermal effect to hands, feet, and shoulders.

According to the chemical body warmer of the present invention, by applying it to the soles of the feet, blood circulation in the hands, feet, shoulders, etc. can be promoted, and an excellent thermal effect can be imparted to the entire body.

FIG. 1 is a schematic plan view of one embodiment of a container used in the present invention. A is a schematic plan view of a moisture-permeable sheet and a moisture-impermeable sheet used in test examples. B is a schematic plan view of the chemical warmer manufactured in the test example. A is a schematic plan view of the pasting sample used in the test example from the chemical warmer side. B is a schematic plan view of the pasting sample used in the test example from the double-sided tape side.

The chemical body warmer of the present invention is a chemical body warmer that is used by being disposed on at least a part of the sole of the foot, and includes a heat generating part that generates heat transmitted to the sole of the foot, and a heat generating part that accommodates the heat generating part and has a surface on at least one side. and a container including a moisture permeable sheet, the heat generating part contains reduced iron powder, and the moisture permeability of the moisture permeable sheet is 650 to 1200 g/m ² ·day. Hereinafter, the chemical body warmer of the present invention will be explained in detail.

[Heating part]
The chemical body warmer of the present invention has a heat generating part containing reduced iron powder in order to generate heat that is transmitted to the soles of the feet. By selecting reduced iron powder as an oxidizable metal that generates oxidation heat when it comes into contact with oxygen, and by using a container having a specific moisture permeability described below, the material is disposed in at least a part of the sole of the foot. When used, it is possible to apply a warming effect to the whole body.

In the present invention, the "heat generating part" is a part that generates heat transmitted to the sole of the foot, and is composed of an exothermic composition containing an oxidizable metal and other components blended as necessary.

Reduced iron powder is powdered iron produced by reducing iron compounds such as iron oxide and iron salts with hydrogen or the like.

The range of the particle diameter of the reduced iron powder used in the present invention is not particularly limited, but includes, for example, more than 10 μm and 800 μm or less. From the viewpoint of further improving the thermal effect on the whole body, the range of the particle size of the reduced iron powder is preferably more than 10 μm and less than 500 μm, more preferably more than 10 μm and less than 300 μm, and particularly preferably more than 10 μm and not more than 60 μm. In the present invention, the particle size range of the reduced iron powder is a value determined according to the method specified in the Japanese Industrial Standards "JIS 8815-1994 Sieving Test Method General Rules".

The apparent density of the reduced iron powder used in the present invention is not particularly limited, but is, for example, 1.0 to 4.0 g/cm ² , preferably 1.5 to 4.0 g/cm ² , more preferably Examples include 2.0 to 4.0 g/cm ² . In the present invention, the apparent density is a value determined according to the method specified in the Japanese Industrial Standards "JIS Z 2504:2012 Metal Powder - Apparent Density Measuring Method".

In the present invention, the content of reduced iron powder in the heat generating part is, for example, 20 to 80% by weight, preferably 25 to 70% by weight, and more preferably 30 to 60% by weight.

Further, in the present invention, the heat generating portion may contain an oxidation promoter in order to retain oxygen and promote oxygen supply to the reduced iron powder. The type of oxidation promoter is not particularly limited as long as it can retain oxygen and supply oxygen to the reduced iron powder, but examples include activated carbon, carbon black, acetylene black, bamboo charcoal, charcoal, and coffee grounds charcoal. Examples of carbon materials include graphite, coal, coconut shell charcoal, blue coal, peat, and lignite. These oxidation promoters may be used alone or in combination of two or more.

Among these oxidation promoters, activated carbon, carbon black, bamboo charcoal, charcoal, and coffee grounds charcoal are preferred, and activated carbon is more preferred.

The shape of the oxidation promoter is not particularly limited, but from the viewpoint of heat generation efficiency, it is preferably in the form of powder, particles, or fibers, and more preferably in the form of powder.

When the heat generating part contains an oxidation promoter, the content of the oxidation promoter in the heat generating part is not particularly limited, but for example, 1 to 30% by weight, preferably 3 to 25% by weight, more preferably 5 to 23% by weight. % is mentioned.

Further, it is preferable that the heat generating portion contains water in order to promote the oxidation reaction of the reduced iron powder. As for water, any of distilled water, ion exchange water, pure water, ultrapure water, tap water, industrial water, etc. may be used.

When water is contained in the heat generating part, the content of water in the heat generating part is not particularly limited, but may be, for example, 5 to 50% by weight, preferably 10 to 40% by weight, and more preferably 15 to 35% by weight. .

Further, the heat generating section may contain a water retaining agent in order to retain water and efficiently supply water to the oxidation reaction site. The type of water retention agent is not particularly limited, but examples include vermiculite, perlite, calcium silicate, magnesium silicate, kaolin, talc, smectite, mica, bentonite, calcium carbonate, silica gel, alumina, zeolite, and dioxide. Inorganic porous materials such as silicon and diatomaceous earth; organic materials such as pulp, wood flour (sawdust), cotton, starches, and cellulose; polyacrylic acid resins, polysulfonic acid resins, maleic anhydride resins, polyacrylamide resins , polyvinyl alcohol resin, polyethylene oxide resin, polyaspartic acid resin, polyglutamic acid resin, polyalginic acid resin, and other water-absorbing resins. These water retention agents may be used alone or in combination of two or more.

Among these water retention agents, vermiculite, polyacrylic acid resin, wood flour, and pulp are preferred; vermiculite and polyacrylic acid resin are more preferred. Further, when an inorganic porous substance is used as a water retention agent, it is also possible to ensure a flow path for air in the exothermic composition.

When the water retention agent is contained in the heat generation part, the content of the water retention agent in the heat generation part is not particularly limited, but is, for example, 1 to 20% by weight, preferably 3 to 15% by weight, and more preferably is 3 to 7% by weight.

Further, the heat generating portion may contain water-soluble salts in order to promote the oxidation reaction of the reduced iron powder. The type of water-soluble salts is not particularly limited, but examples include alkali metals (sodium, potassium, etc.), alkaline earth metals (calcium, magnesium, etc.), or heavy metals (iron, copper, aluminum, zinc, nickel, silver, Examples include sulfates, hydrogen carbonates, chlorides, and hydroxides of barium, etc.). Among these water-soluble salts, from the viewpoint of conductivity, chemical stability, etc., chlorides such as sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and iron chloride (first and second) are more preferable. Examples include sodium chloride. These water-soluble salts may be used alone or in combination of two or more.

When water-soluble salts are contained in the heat-generating part, the content of water-soluble salts in the heat-generating part is not particularly limited, but is, for example, 0.1 to 10% by weight, preferably 0.5 to 10% by weight. 7% by weight, more preferably 0.5 to 5% by weight.

In addition, other additives such as oxidized metals other than reduced iron powder, metal ion sequestrants, fragrances, thickeners, excipients, surfactants, hydrogen generation inhibitors, etc. are added to the heat generating part as necessary. May be included.

The exothermic composition used as the exothermic part can be prepared by mixing predetermined amounts of the above-mentioned components. Although the exothermic composition used as the exothermic part may be prepared in the presence of oxygen, it is preferably prepared under reduced pressure or an inert gas atmosphere.

In the chemical body warmer of the present invention, the amount of the heat generating part accommodated in each container may be appropriately set within the range applicable to the sole of the foot, for example, 5 to 30 g, preferably 10 to 20 g. , more preferably 12 to 18 g.

[Container]
The chemical warmer of the present invention has a housing for housing the heat generating part. In the chemical warmer of the present invention, the container has a moisture permeable sheet having a moisture permeability of 650 to 1200 g/m ² ·day on at least one surface in order to supply oxygen and water vapor to the heat generating part during use. There is. By using a container having a moisture permeable sheet with a specific moisture permeability in combination with a heat generating part containing reduced iron powder, it is possible to impart a thermal effect to the whole body even when applied to the soles of the feet. It becomes possible.

The moisture permeability of the moisture permeable sheet used in the present invention may be 650 to 1200 g/m ² ·day, but from the viewpoint of further improving the thermal effect on the whole body, the moisture permeability of the moisture permeable sheet is Preferably, it is 680 to 1150 g/m ² ·day, more preferably 700 to 1100 g/m ² ·day. In the present invention, moisture permeability is measured under the conditions of a temperature of 40°C and a humidity of 90% RH by the method specified in the Japanese Industrial Standards "JIS Z0208-1975 Moisture permeability test method for moisture-proof packaging materials (cup method)". It is a value.

The material of the moisture-permeable sheet is not particularly limited as long as it has the above-mentioned moisture permeability, but it is preferably formed of at least a breathable resin layer (resin layer with pores) to improve the feeling of use. From this viewpoint, a laminated sheet of a breathable resin layer and a fiber base material is more preferable. The laminated sheet of the breathable resin layer and the fiber base material may be such that the breathable resin layer and the fiber base material are laminated in this order from the inside of the container to the outside.

The constituent resin of the breathable resin layer is not particularly limited, but includes, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide, polyurethane, polystyrene, polyvinyl. Examples include alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and the like. Among these resins, polyethylene, polypropylene, and ethylene-vinyl acetate copolymers are preferred.

Further, the breathable resin layer may be any resin film provided with pores to ensure breathability. The shape, size, and number of pores provided in the resin film may be appropriately set depending on the moisture permeability that the container should have.

The thickness of the breathable resin layer may be appropriately set depending on the layer structure of the moisture permeable sheet, and is, for example, 15 to 150 μm, preferably 30 to 100 μm, and more preferably 50 to 80 μm.

Specific examples of the fiber base material used in the moisture permeable sheet include nonwoven fabrics and woven fabrics. From the viewpoint of usability, etc., nonwoven fabrics are preferred. The material of the fiber base material 232 is not particularly limited, but includes, for example, synthetic fibers such as polyethylene terephthalate, polybutylene terephthalate, nylon, polypropylene, polyethylene, vinylon, rayon, acrylic, acetate, and polyvinyl chloride; cotton, linen, and silk. , natural fibers such as paper; mixed fibers thereof, and the like. Among these materials, polyethylene terephthalate, nylon, and polypropylene are preferred, and polyethylene terephthalate and nylon are more preferred, from the viewpoint of improving the usability.

The basis weight of the fiber base material may be set as appropriate depending on the layer structure of the moisture permeable sheet, but for example, it is 1 to 100 g/m ² , preferably 5 to 70 g/m ² , more preferably 10 to 50 g/m 2 . m ² is mentioned.

Lamination of the breathable resin layer and the fiber base material can be performed by a known lamination method such as dry lamination, extrusion lamination, or heat lamination.

The container used in the present invention may include the moisture permeable sheet on at least one surface. It is preferable that the container used in the present invention has a shape that has two surfaces, a surface disposed on the sole side and a surface disposed on the opposite side. In the case of a shape having a moisture permeable sheet, the entire surface may be formed of the moisture permeable sheet, or one surface may be formed of the moisture permeable sheet and the other surface may be a sheet with low moisture permeability (hereinafter referred to as "non-moisture permeable sheet"). may be formed by

The moisture permeability of the moisture-impermeable sheet is, for example, 10 g/m ² ·day or less, preferably 5 g/m ² ·day or less, more preferably 2 g/m ² ·day or less, and even more preferably 1 g/m ² ·day. Below, 0 g/m ² ·day is particularly preferred.

The material of the moisture-impermeable sheet is not particularly limited, but preferably includes a resin sheet without pores. The constituent resin of the resin sheet constituting the moisture-impermeable sheet is not particularly limited, and examples thereof include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polyacrylonitrile, ethylene-vinyl alcohol copolymer, polyamide, Examples include polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and the like. Among these resins, polyethylene, polypropylene, and ethylene-vinyl acetate copolymers are preferred.

The thickness of the resin sheet constituting the moisture-impermeable sheet may be appropriately set depending on the layer structure of the moisture-impermeable sheet, and is, for example, 115 to 250 μm, preferably 130 to 200 μm, and more preferably 150 to 250 μm. An example is 180 μm.

Further, the moisture-impermeable sheet may be formed by laminating a fiber base material on a resin sheet without pores, if necessary. The material, basis weight, etc. of the fiber base material used in the moisture-impermeable sheet are the same as those exemplified for the moisture-permeable sheet.

Moreover, it is preferable that an adhesive layer is provided on one surface of the container so that it can be fixed to the sole of the foot during use. In the case where both sides of the container are formed of the moisture permeable sheet, it is sufficient that an adhesive layer is provided on the surface of one of the moisture permeable sheets, and one side is formed of the moisture permeable sheet and the other side is formed of the moisture permeable sheet. When it is formed of a moisture-impermeable sheet, an adhesive layer may be provided on the surface of the moisture-impermeable sheet.

The adhesive layer may be provided on the entire surface of one surface of the container, or may be provided partially on one surface of the container.

The adhesive layer can be formed using an adhesive. Adhesives include polymers that exhibit tackiness in the presence of oils or other solvents, etc., and the tackiness polymers exhibit tackiness when dispersed or dissolved in oils or other solvents. It is a composition that has The type and composition of the adhesive polymer contained in the adhesive is known, and in the present invention, the adhesive used in the adhesive layer of conventional disposable hand warmers can be used. Specific examples of the adhesive include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, and the like.

The coating amount of the adhesive layer is, for example, 5 to 40 g/m ² , preferably 10 to 30 g/m ² , and more preferably 15 to 25 g/m ² .

Further, when an adhesive layer is provided on one surface of the container, a release layer that can be released from the mold may be provided on the outer surface of the adhesive layer. When a release layer is provided, it is possible to prevent the adhesive layer from drying during storage, prevent deterioration in handleability due to adhesion of the adhesive layer, etc.

Examples of the release layer include resin films such as polyethylene terephthalate, polyacrylonitrile, ethylene-vinyl alcohol copolymer, and polypropylene; paper treated with release properties such as silicone processing, and the like. Furthermore, even when a resin film is used as the release layer, it may be subjected to release property imparting processing such as silicone processing.

When the container has a shape consisting of two surfaces, a surface disposed on the sole side and a surface disposed on the opposite side, the two moisture permeable sheets, or the one moisture permeable sheet and the It is formed by laminating one moisture-impermeable sheet around the area that accommodates the heat generating part.

The method of laminating the two moisture permeable sheets or one moisture permeable sheet and one moisture impermeable sheet is not particularly limited, but for example, a heat-fusible resin may be attached to the moisture permeable sheet or the moisture impermeable sheet. is used, the ends may be thermally welded (heat-sealed) using the heat-fusible resin, or the ends may be pasted together using an adhesive.

The shape of the container may be set so that it can be disposed on at least a part of the sole of the foot, and may be appropriately set depending on the part of the sole of the foot to which it is applied. For example, if it is placed from a part of the sole of the toe to the base of the sole of the toe, the planar shape will extend in one direction from the straight edge, as shown in Figure 1. One example is a shape in which the other end is circular. Further, one form of the container is a substantially flat shape, but the surface of the container that is disposed on the sole side may be provided with a concave portion, a convex portion, etc. so as to follow the shape of the sole of the foot. .

The area of the portion of the container that accommodates the heat generating portion (the area of the portion where the heat generating portion is accommodated when viewed from above) is, for example, 20 to 180 cm ² , preferably 30 to 70 cm ² , more preferably Examples include 35 to 60 cm ² .

[Package presentation]
The chemical body warmer of the present invention is packaged in a packaging material having oxygen barrier properties and is provided in a state where it does not come into contact with air. By disposing it on at least a portion of the sole of the foot during use, the heat generating portion comes into contact with air and starts generating heat.

[how to use]
The chemical warmer of the present invention is used by being placed on at least a portion of the sole of the foot. When applied locally to at least a portion of the soles of the feet, the chemical body warmer of the present invention can impart a warming effect to the whole body, including the hands, feet, and shoulders, and can promote blood circulation throughout the body. . In addition, the medical device for thermal treatment of the present invention can impart a thermal effect to the whole body, thereby promoting blood circulation throughout the body, improving sensitivity to cold, improving fatigue, improving muscle stiffness, and activating gastrointestinal function. It can also be used for purposes such as immunostimulation.

The chemical warmer of the present invention may be used by being fixed directly to the skin of the sole of the foot, or may be fixed to the sole of the foot while wearing socks. The chemical warmer of the present invention can also be used by fixing it to the insole of shoes or slippers and wearing the shoes or slippers.

The areas on the sole of the foot to which the chemical warmer of the present invention is applied are not particularly limited, and include, for example, the soles of the toes, the bases of the soles of the toes, the arches of the feet, the flexor digitorum brevis muscle, the heel, and the like. Further, the chemical warmer of the present invention may be designed to be disposed on at least a part of the sole of the foot, for example, in addition to a part of the sole of the foot, the surface of the toes or at least the top of the foot. It may also be designed to be disposed in some parts. From the viewpoint of further improving the thermal effect on the whole body, the area on the sole of the foot where the chemical warmer of the present invention is placed is preferably at least the base of the sole of the toe, and more preferably the sole of the toe. Examples include at least a portion and the base of the sole of the toe, particularly preferably the sole of the foot in an area from about 0 to 1 cm from the tip of the middle toe to about 9 to 20 cm toward the heel.

The present invention will be specifically described below with reference to Examples, but the present invention is not limited thereto.

Test example 1: Verification test of thermal effect on the whole body
1. Preparation of Chemical Warmer Moisture permeable sheets A to F of each moisture permeability shown in Table 1 were prepared. The shape of each moisture permeable sheet is as shown in A of FIG. The moisture permeability of each moisture permeable sheet was determined by the method specified in the Japanese Industrial Standards "JIS Z0208-1975 Moisture permeability test method for moisture-proof packaging materials (cup method)" at a temperature of 40°C and a humidity of 90% RH. The moisture permeable sheets A to F prepared were made by dry laminating a spunlace nonwoven fabric made of polyethylene terephthalate (fabric weight 30 g/m ² ) and a polyethylene film with pores (thickness 60 μm). The polyethylene film is a laminated sheet whose moisture permeability is controlled by the size and number of pores in the polyethylene film.

In addition, a moisture-impermeable sheet (thickness: 159 μm) having a moisture permeability of 0 g/m ² ·day was prepared. The shape of the moisture-impermeable sheet is as shown in A of FIG. After applying an adhesive to one side of the moisture-impermeable sheet at a concentration of 21 g/m ² , a release sheet was laminated thereon.

In addition, various iron powders shown in Table 2 were separately prepared. Note that iron powder A was prepared by classifying iron powder ("MR2" (manufactured by Dowa Iron Powder Industries Co., Ltd.) through a mesh with an opening of 180 μm and collecting the iron powder remaining on the mesh. Iron powder B was prepared by classifying iron powder ("MR2" (manufactured by Dowa Iron Powder Industries Co., Ltd.) through a mesh with an opening of 45 μm and collecting the iron powder that passed through the mesh. Iron powder C was Powder ("80AF", (manufactured by Kobe Steel, Ltd.) was used. Iron powder D was obtained by classifying iron powder ("80AF", (manufactured by Kobe Steel, Ltd.) through a mesh with an opening of 180 μm. The apparent density was measured by the method specified in the Japanese Industrial Standards "JIS Z 2504:2012 Metal Powder - Apparent Density Measuring Method".

Using each of the above iron powders, exothermic compositions having the compositions shown in Table 3 were prepared and used as heating elements. The nonwoven fabric side of the moisture permeable sheet and the adhesive layer laminated to the non-vapor permeable sheet were arranged so that they were on the outside, respectively, and 13 g of the prepared heating element was sandwiched between the moisture permeable sheet and the moisture non-permeable sheet. . In this state, the peripheral edges (width 0.5 cm) of both sheets were thermally welded so that they looked like B in Figure 2 when viewed from above, producing a chemical body warmer in which the heating element was housed in the housing part (Figure 2). The black line surrounding the periphery in B of 2 is the heat-sealed periphery). In addition, in the container for the manufactured chemical body warmer, the area of the portion accommodating the heat generating portion (the area of the portion accommodating the heat generating portion when viewed from above) was 57 cm ² .

The manufactured chemical warmer was quickly placed in a gas-impermeable sealed bag and sealed. In addition, in the manufactured chemical warmer, the combinations of the moisture permeable sheet and the iron powder used in the heating element are as shown in Table 4.

2. Evaluation of thermal effect on the whole body (1) Preparation of sample for pasting Cut the sole of a new commercially available sock (constituent materials: 53% polyester, 42% nylon, and 5% polyurethane) into a rectangle ( A lower cloth with a length of 10 cm and a width of 8 cm was obtained. The adhesive layer side of the chemical warmer obtained above was attached to one side of the base. Furthermore, two double-sided tapes were attached to both ends of the other surface of the base to obtain a sample for pasting. FIG. 4A shows a plan view of the attachment sample from the chemical warmer side, and FIG. 4B shows a plan view of the attachment sample from the double-sided tape side.

(3) Measurement of thermal effect Blood flow was measured using the following method using one 29-year-old male as a subject. First, the temperature in the measurement room was set to 20° C. and the humidity was 30% RH, and the room was left for about 1 hour to confirm that the temperature and humidity were stable. Next, subjects wearing only socks and seawater pants were allowed to enter the measurement room, and after 30 minutes of acclimatization with their socks removed, their feet (ankle of right foot), hands (back of right hand), and shoulders were examined. The blood flow (blood flow before application) of (the back area of the right shoulder) was measured using a Doppler blood flow meter (“PeriScan” manufactured by Integral Co., Ltd.) (blood flow before application). Next, the apex X shown in A in Figure 4 is located 1 cm from the tip of the middle toe of the left sole of the left foot, and the apex X is on the finger side and the edge Y is on the heel side. The sample for attachment was attached to the area from the sole of the toe to the base of the sole of the foot via tape, and this state was maintained for 60 minutes.

60 minutes after pasting the pasting sample on the sole of the foot, the blood flow in the foot (ankle part of the right foot), hand (the back of the right hand), and shoulder (the back part of the right shoulder) (blood after pasting) flow) was measured using a Doppler blood flow meter. The amount of change in blood flow after use was calculated by subtracting the value of blood flow before application from the value of blood flow after application.

In addition, blood flow was measured in the same manner using the same test subject, but with the sample applied to the heel of the left foot. In addition, when the pasting sample was pasted on the heel of the sole of the left foot, the vertex X shown in A in FIG. 4 was arranged on the vertex side of the heel, and the end side Y was arranged on the toe side.

Furthermore, blood flow was measured in the same manner using the same subject, but with the sample applied to the left shoulder. In addition, when pasting the pasting sample on the left shoulder, the vertex X shown in A in FIG. 4 was placed on the neck side of the left shoulder, and the edge Y was placed on the left arm side.

3. Results The results are shown in Table 4. A chemical body warmer that uses a heating element containing reduced iron and a moisture-permeable sheet with a moisture permeability of 650 to 1200 g/m ² ·day increases blood flow throughout the hands, feet, and shoulders when applied to the soles of the feet. was observed, and an excellent thermal effect could be imparted to the whole body (Examples 1 to 3). In contrast, when a heating element containing unreduced iron was used, blood flow to the hands and feet did not increase when applied to the soles of the feet, regardless of the moisture permeability of the moisture-permeable sheet (comparative example). 1-5). In addition, even if a heating element containing reduced iron is used, a chemical body warmer using a moisture permeable sheet that does not meet the moisture permeability of 650 to 1200 g/m ² ·day will cause damage to the feet and shoulders even when applied to the soles of the feet. The thermal effect provided was limited (Comparative Example 6). Furthermore, the chemical body warmer of Comparative Example 6 was unable to increase blood flow in the hands even when applied to the shoulders.

1 Container 11 Container 12 that accommodates the heating element in the container End portion (sealed portion) that constitutes the bonded portion in the container

Claims (5)

A chemical warmer used by being placed on at least a part of the sole of the foot,
A heat generating part that generates heat that is transmitted to the sole of the foot;
a housing that houses the heat generating part and includes a moisture permeable sheet on at least one surface;
The exothermic part is composed only of a powdered exothermic composition containing reduced iron powder, and the moisture permeability of the moisture permeable sheet is 650 to 1200 g/m ² ·day.
Chemical warmer. The chemical body warmer according to claim 1, wherein the exothermic composition further comprises a pro-oxidant and water. The chemical warmer according to claim 1 or 2, wherein the moisture permeable sheet is a laminated sheet of a breathable resin layer having pores and a fiber base material. The chemical warmer according to claim 1, wherein an adhesive layer is provided on one surface of the container. A chemical body warmer according to any one of claims 1 to 4, which is used to impart a thermal effect to hands, feet, and shoulders.

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