TW202114605A - Heating instrument - Google Patents

Abstract

The purpose of the present invention is to provide a heating instrument using a sheet obtained by adjusting moisture permeability by a means different from prior art. This heating instrument accommodates a heating composition, which generate heat by making contact with oxygen, in an accommodation bag having moisture permeability, wherein a surfactant is applied in an amount of 0.1x10-3 mg per 1 cm2 to at least a portion of the sheet that constitutes the accommodation bag and has moisture permeability.

Description

Heating element

The present invention relates to heating elements.

Background technique

In the past, various heating elements have been used as body warmers or thermal treatment devices. Among them, heating elements such as disposable warm packs that generate heat in the presence of oxygen (air) are often used because they are excellent in safety, simplicity, portability, etc., and are inexpensive.

For example, the previous general disposable warm package contains the heat-generating composition in a moisture-permeable or air-permeable bag, and its heat generation is based on the heat generation principle that the heat-generating composition in the bag is in contact with oxygen (Patent Document 1). Therefore, for the heating element using the above-mentioned heating principle, it is necessary to work hard to heat it to the target temperature. For example, one of the methods is to appropriately adjust the moisture permeability or air permeability of the bag.

The adjustment of the moisture permeability or air permeability of the bag is generally carried out by appropriately changing the size or number of pores provided on the non-woven fabric and other sheets constituting the bag to ensure moisture permeability or air permeability. . However, the above adjustment requires preparing a sheet with a desired size or number of pores for each target heating temperature, which is very time-consuming and costly. Furthermore, such a sheet adjusted by the size or number of pores has a specific moisture permeability. Therefore, when a sheet with different moisture permeability is to be obtained, the size or number of pores must be matched with the desired moisture permeability. change. Advanced technical literature Patent literature

[Patent Document 1] Japanese Patent Application Publication No. 7-80018

Summary of the invention The problem to be solved by the invention

Therefore, the object of the present invention is to provide a heat generating element using a sheet with a moisture permeability adjusted differently from the previous method. Means to solve the problem

In view of the foregoing problems, the inventors have devoted themselves to research and found that among the heating elements, there is a sheet used in a moisture-permeable storage bag for containing a heating composition that can generate heat by contact with oxygen. The material, that is, for the moisture-permeable sheet that constitutes at least a part of the storage bag, 0.1×10 ^-3 mg or more of surfactant ^{per 1 cm 2 is applied to at least a part of the sheet, and the sheet can be changed} The moisture permeability of the material. The present invention is based on the above-mentioned findings and further repeated research, and the result is completed, and its content is disclosed as follows. Item 1. A heat-generating element, which contains a heat-generating composition in a moisture-permeable storage bag, the heat-generating composition can generate heat by contact with oxygen, and is moisture-permeable when forming the storage bag At least part of the sheet is coated with more than 0.1×10 ^-3 mg of surfactant ^{per 1 cm 2.} Item 2. The heating element according to Item 1, wherein the aforementioned sheet material is at least one selected from the group consisting of a moisture-permeable resin film, non-woven fabric, and woven fabric. Item 3. The heating element according to item 2, wherein the aforementioned resin film having moisture permeability is a thermoplastic resin film having moisture permeability. Item 4. The heating element according to any one of items 1 to 3, wherein the aforementioned surfactant is at least one selected from the group consisting of an amphoteric surfactant and a cationic surfactant. Invention effect

According to the present invention, in the heating element, the sheet used for the moisture-permeable storage bag for containing the heat-generating composition that can generate heat by contact with oxygen, that is, for at least a part of the storage bag For a sheet with moisture permeability, at least a part of the sheet is coated with a surfactant in such a way that the coating area becomes 0.1×10 ^{-3 mg or more per 1 cm 2 to change the moisture permeability of the sheet.} Based on the above, according to the present invention, a heat generating element can be provided. The heat generating element is housed in a moisture-permeable housing bag with a heat-generating composition that can generate heat by contact with oxygen, and uses a moisture permeability adjusted The sheet is made by coating 0.1×10 ^{-3 mg or more of surfactant per 1 cm 2} to adjust the moisture permeability.

The form used to implement the invention

Hereinafter, the present invention will be explained in more detail.

The present invention provides a heating element. The heating element is contained in a moisture-permeable housing bag with a heat-generating composition that can generate heat by contact with oxygen, and is used in a moisture-permeable sheet constituting the housing bag At least a part of it is coated with more than 0.1×10 ^-3 mg of surfactant ^{per 1 cm 2.}

Sheet In the present invention, the sheet is contained in a moisture-permeable housing bag containing a heat-generating component capable of generating heat by contact with oxygen, and a moisture-permeable sheet constituting at least a part of the housing bag material. Examples of the sheet include resin films, non-woven fabrics, woven fabrics, etc., but are not limited to these.

Any resin film can be used as long as it has moisture permeability, and has sufficient strength and durability to be used as the aforementioned heating element. As for the resin film, a thermoplastic resin film is preferably exemplified.

Examples of thermoplastic resins include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and ethylene. -Vinyl acetate copolymers and the like, preferably exemplified by polyethylene, polypropylene, ethylene vinyl acetate copolymers, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types.

It forms pores in the resin film to ensure moisture permeability. As mentioned above, since the resin film is used for the storage bag of the aforementioned heat-generating composition, the pores formed in the resin film generally only need to allow oxygen (air) to pass through the inside and outside of the storage bag (that is, have air permeability). ), and can prevent the exothermic composition from leaking out of the storage bag. There are no restrictions on the size, shape, number, and method of forming the pores. For example, a previously known disposable heater can be used. Perforated membranes and porous membranes used in warm packs. The porous membrane has a general meaning in the past, and refers to a porous membrane having a plurality of pores in which a plurality of pores are continuous. The pores may be uniformly formed in the entire area of the resin film, or may be formed densely in a part.

The thickness of the resin film is not limited as long as it can be used for the aforementioned heating element, and it can be exemplified: preferably 10 to 2000 μm, preferably 10 to 1000 μm.

Any non-woven fabric and woven fabric can be used as long as they have moisture permeability, and have sufficient strength and durability to be used for the aforementioned heating element.

It is not intended to limit the present invention, but for non-woven or woven fiber materials, examples can be: nylon, vinylon, polyester, rayon, acrylic, polyethylene, polypropylene, acetate, polyvinyl chloride , Synthetic fibers such as polybutylene terephthalate, natural fibers such as cotton, linen, silk, paper, and mixed fibers of synthetic fibers and natural fibers, etc. From the viewpoint of the feeling of use, the fiber material is preferably nylon, polyester, polypropylene, etc., more preferably nylon, polyester, etc. These may be used individually by 1 type, and may be used in combination of 2 or more types.

Since non-woven fabrics or woven fabrics are moisture-permeable and are used for the storage bag of the heat-generating composition as described above, they generally only need to allow oxygen (air) to pass through the inside and outside of the storage bag described later, and to prevent the storage There is no restriction on leakage from the bag. For example, the weight per unit area can be 20 to 70 g/m ² .

The thickness of the non-woven fabric or the woven fabric is not limited as long as the effect of the present invention can be obtained, and it can be exemplified: preferably 10 to 2000 μm, preferably 10 to 1000 μm.

Therefore, in the present invention, the sheet is a moisture-permeable sheet that constitutes a storage bag containing the aforementioned exothermic composition. In the present invention, at least a part of the aforementioned sheet material is coated with 0.1×10 ^-3 mg or more of surfactant ^{per 1 cm 2.}

The moisture permeability of these sheets before coating the surfactant is not limited as long as the effect of the present invention can be obtained. Examples can be: 100~1000g/m ² ･day, preferably 300~800g/m ² ･ day, more preferably 330~550g/m ² ･day. The moisture permeability is measured in accordance with JIS K7129 (2008). As described later, the sheet may be a single layer or a laminated one.

Furthermore, as described later, the heating element may be further equipped with one or more moisture-permeable storage bags that are different from the storage bag. Examples of these different storage bags may be An example is a moisture-permeable storage bag that contains useful ingredients such as fragrances, and the heat-generating composition in the aforementioned storage bag generates heat by contact with oxygen, and uses the heat to generate useful effects from the useful ingredients. Player. From this point of view, in the present invention, the sheet may further be a moisture-permeable sheet that is different from the aforementioned storage bag containing the exothermic composition and constitutes a moisture-permeable storage bag. The sheet may constitute at least a part of these storage bags, or may constitute the entirety. As will be described later, as long as 0.1×10 ^-3 mg or more ^{per 1 cm 2 is applied to at least a part of the sheet} Surfactant is sufficient.

The surfactant is coated on at least a part of the aforementioned sheet material, and more than 0.1×10 ^-3 mg of surfactant is ^{applied per 1 cm 2.}

The surfactant may be any one of nonionic surfactants, amphoteric surfactants, cationic surfactants, and anionic surfactants. These may be used individually by 1 type, and may be used in combination of 2 or more types.

It is not intended to limit the present invention, but examples of non-ionic surfactants are preferably: polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene glycol, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene dewatering Sorbitol fatty acid ester, sorbitan fatty acid ester, polysorbitan fatty acid ester, polyoxyethylene fatty acid ester, polyethylene glycol fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene fatty acid glycerin Base, sucrose fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene sterol, etc. Preferred examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene glycol, and the like. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

It is not intended to limit the present invention, but to illustrate an example. For example, for polyoxyethylene alkyl ethers, the carbon number of the alkyl group or alkenyl group constituting the alkyl part is preferably 8-24, preferably 8-22, and more The best is 8~20 etc. The alkyl group or alkenyl group may be linear or branched. The average added molar number of the ethylene oxide unit (EO) is preferably about 2-50, preferably about 2-40, more preferably about 2-30.

It is not intended to limit the present invention, but a more specific example of polyoxyethylene alkyl ether can be exemplified: the average added molar number of EO is preferably about 2-50, preferably about 2-40, more preferably 2-30 Left and right, polyoxyethylene (POE) decyl ether, POE lauryl ether, POE cetyl ether, POE isocetyl ether, POE stearyl ether, POE isostearyl ether, POE octyl lauryl ether, POE Oleum ether, POE behenyl ether, POE alkyl (12-14) ether, etc.

Polyoxyethylene alkyl ether may be used individually by 1 type, and may be used in combination of 2 or more types arbitrarily.

In addition, it is not intended to limit the present invention, but to illustrate an example, for example, the content rate (weight%) of the ethylene oxide unit (EO) of polyoxyethylene polyoxypropylene glycol can be exemplified: preferably about 1 to 99%, more preferably About 10~90%, more preferably about 10~85%, still more preferably about 20~50%, etc. The average molecular weight (weight average molecular weight) of the hydrophobic group can be exemplified: preferably about 100 to 10,000, preferably about 500 to 7,500, more preferably about 1,000 to 5,000, and still more preferably about 2,000 to 4,000.

Regarding polyoxyethylene polyoxypropylene glycol, it is preferable to exemplify those satisfying the aforementioned EO content and the average molecular weight of the hydrophobic group at the same time, and the preferable EO content is about 10 to 85% and the average molecular weight of the hydrophobic group is about 500 to 7,500. The best EO content is about 20-50% and the average molecular weight of the hydrophobic group is about 2000-4000. Polyoxyethylene polyoxypropylene glycol can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

It is not intended to limit the present invention, but examples of amphoteric surfactants can be exemplified: Amide betaine type amphoteric surfactants, alkyl betaine type amphoteric surfactants, amine oxide amine oxide type amphoteric surfactants, imidazoline Type amphoteric surfactant, sulfasulfobetaine type amphoteric surfactant, etc. Preferred examples of amphoteric surfactants include amidobetaine type amphoteric surfactants, alkyl betaine type amphoteric surfactants, and the like. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

Regarding an example of an amphoteric surfactant, a preferable example can be: coconut oil fatty acid cocamidopropyl betaine, alkyl dimethyl amino acetate betaine, lauryl betaine, laurate cocamidopropyl betaine (lauramidopropyl betaine), lauramidopropyl amine oxide, coco amphoteric sodium acetate, lauramidopropyl hydroxysultaine, ricinoleic acid amide propyl betaine, palm nuclear fatty acid amide propyl Betaine, palm oil fatty acid amidopropyl betaine, myristyl amidopropyl betaine, stearyl betaine, hydroxyalkyl (C12-14) hydroxyethyl sarcosine, etc. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

It is not intended to limit the present invention, but examples of cationic surfactants are quaternary ammonium salt type, amine salt type, and the like. As for the cationic surfactant, a quaternary ammonium salt type is preferably exemplified. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

As an example of the cationic surfactant, preferable examples include: alkyl dimethyl benzyl ammonium chloride, lauryl dimethyl ethyl ammonium ethyl sulfate, distearyl dimethyl ammonium chloride, and chlorine Stearyl trimethyl ammonium and so on. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

It is not intended to limit the present invention, but examples of anionic surfactants include carboxylic acid type, sulfonic acid type, sulfate ester type, phosphate ester type, and the like. Preferred examples of anionic surfactants include sulfonic acid type and sulfate ester type. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

Preferable examples of anionic surfactants include sodium dioctyl sulfosuccinate, sodium polyoxyethylene tridecyl ether sulfate, and the like. These can be used individually by 1 type, and can also be used in combination of 2 or more types arbitrarily.

Surfactant-coated sheet At least a part of the aforementioned sheet is coated with more than 0.1×10 ^-3 mg of surfactant ^{per 1 cm 2 as described above.} The sheet coated with a surfactant can be obtained by coating at least a part of the aforementioned sheet with a surfactant.

The surface active agent is applied to the aforementioned sheet as long as 0.1×10 ^-3 mg or more of the surface active agent ^{per 1 cm 2 is applied to at least a part of the aforementioned sheet, and there is no limitation.} The agent is carried out in contact with the aforementioned sheet. By coating the sheet with a surfactant, the moisture permeability of the sheet can be changed.

It is not intended to limit the present invention, but the coating can be carried out by mixing the surfactant with water, ethanol, propylene glycol and other solvents as necessary, and applying the obtained mixture to the sheet by dipping, dripping, spraying (spraying), etc. Let it dry to proceed. In addition, the application of the surfactant to the sheet can be performed from any direction of the sheet. It is not intended to limit the present invention, but for example, the surface active agent is applied from one or both of the part (inner side) of the sheet arranged on the inner side of the aforementioned storage bag, the part (outer side) arranged on the outer side of the storage bag . In addition, the coating of the surfactant on the sheet can be performed on a part of the sheet, or on the entire surface, preferably on the inner side and/or the entire outer side.

The sheet coated with the surfactant may be a single layer or a laminated one. Regarding the laminate, a laminate of two or more sheets of the same type or different types selected from the aforementioned resin film, nonwoven fabric, woven fabric, and the like can be exemplified. Regarding the single layer, one type of single layer sheet selected from the aforementioned resin film, nonwoven fabric, woven fabric, etc., and two or more types selected from the aforementioned resin film, nonwoven fabric, woven fabric, etc., are arbitrarily joined to form a single layer. Wait. As for the above-mentioned sheet, it is preferable to exemplify: the aforementioned resin film, a single-layer sheet of a non-woven fabric or a woven fabric, a resin film, and a laminated sheet of at least one selected from the group consisting of a non-woven fabric and a woven fabric.

As far as the amount of surfactant applied to the sheet is concerned, the portion of the sheet ^{coated with the surfactant per 1 cm 2} (the coated portion of the surfactant) as long as the surfactant is 0.1×10 ^-3 mg or more , There is no limitation, and examples can be exemplified: preferably 0.1×10 ^-3 ~10 mg or more, preferably 0.1×10 ^-2 to 10 mg, more preferably 0.5×10 ^-2 to 1 mg, and even more preferably 0.01 to 0.2 mg . The coating amount can be appropriately determined according to the type of surfactant or the degree of moisture permeability to be controlled, etc., so ^{that the surfactant per 1 cm 2} of the coated portion becomes 0.1×10 ^-3 mg or more.

The coating amount of the surfactant per 1cm ^{2 of the} coated portion of the surfactant is obtained by dividing the amount (mg) of the surfactant coated on the sheet by the portion of the sheet coated with the surfactant Area (cm ² ).

Furthermore, when the aforementioned surfactant is applied to one side (single side) of the sheet, the ^{amount of surfactant applied per 1 cm 2 of} the coated portion is determined by the amount of surfactant applied to the sheet The amount (mg) is divided by the area (cm ² ) of the portion of the sheet coated with the surfactant. When the aforementioned surfactant is coated on both sides (both sides) of the sheet ^{, the coating amount of the surfactant per 1 cm 2 of} the coated part is calculated per 1 cm on each side (each single side) ^{2 The} sum of the coating amount of the surfactant in the coating part.

It is not intended to limit the present invention, but a resin film is preferably exemplified for the sheet material coated with a surfactant. In addition, it is not intended to limit the present invention, but for example, when the sheet used for coating the surfactant is a laminated sheet of a resin film and a non-woven fabric, the surfactant may be applied only to the resin film (resin film surface), It is performed only on any one of non-woven fabric (non-woven fabric surface), resin film and non-woven fabric (both sides), and it is preferably performed only on resin film.

In the present heating element, at least the aforementioned sheet constituting the storage bag containing the aforementioned exothermic composition is compared with the sheet before the surfactant coating, and the moisture permeability of the aforementioned surfactant coating portion is changed. The moisture permeability is measured in accordance with JIS K7129 (2008).

Heating element This heating element uses the heating principle of a heating composition that generates heat in the presence of oxygen (air) to generate heat. That is, the heat generating element is provided with a heat generating composition that generates heat in the presence of oxygen (air).

The heating element is only required to generate heat to a desired temperature according to the purpose of use. Examples of heating elements suitable for heating to about 32 to 85°C, preferably about 34 to 70°C, and more preferably applied to the skin are exemplified.

The heating temperature of the heating element is measured according to JIS S4100 (2007). Specifically, the specified base dressing and covering materials are superimposed on the warm part specified in JIS S4100 (2007), and the temperature is raised to 30°C and kept at ±1°C. On the other hand, it is placed in the same atmosphere as the surrounding temperature. After the heating element of more than 2 hours generates heat based on the usage method, the temperature is measured based on the specific method.

The heating element can be applied to the body such as eyes, shoulders, waist, back, wrists, feet, soles, etc., and can be used as a body warmer by applying them. In addition, when the heating element contains ingredients such as fragrance, analgesic component, anti-inflammatory component, blood circulation promoting component, for example, the heating element can also be said to have a relaxing effect (relaxing element), analgesic effect (analgesic element), and inflammation suppression. Those with effect (inflammation inhibitor), those with blood circulation promotion effect (blood circulation promotion means), etc. In addition, the heating element can not only be applied to the body, but also can be used as a space fragrance (space aroma device), deodorizer (deodorizer), and insect repellent based on the characteristics of the components of the heating element such as fragrances or repellent ingredients. Repellent (insect repellent) and other users.

In addition, the heating element may be provided with an adhesive. Specifically, the heating element may be an adhesive used to stick to skin or clothing with a peelable force, directly or indirectly provided on the outside of, for example, a storage bag described later, or no adhesive may be provided. Examples of adhesives include adhesives used in so-called sticky disposable warm packs that are adhered to clothing, etc., and adhesives used in direct-attached warm warm packs that are directly applied to the skin or the like. On the surface of the adhesive, in order to prevent drying of the adhesive and ease of operation, it can also be pasted with silicon-processed polyethylene terephthalate, poly Films such as acrylic or paper, etc. are usually peeled off when the heating element is used.

Exothermic composition In this heating element, the heating composition is one that generates heat by contact with oxygen (air), and is contained in a moisture-permeable storage bag. As described above, at least a part of the sheet constituting the storage bag is coated with the aforementioned surfactant.

The exothermic composition can be exemplified by the exothermic composition used in general disposable warm packs as the exothermic composition, and the exothermic composition can be exemplified by an oxidation promoter, oxidized metal powder, and water. , But not limited to this.

It is not intended to limit the present invention, but examples of oxidation promoters include activated carbon, coal, charcoal, bamboo charcoal, carbon black, graphite, acetylene black, and coffee ground charcoal. These may be used individually by 1 type, and may be used in combination of 2 or more types. The shape of the oxidation promoter is also not limited, and powdery, granular, fibrous, and other powdered forms used in conventional disposable warm packs can be exemplified. These may be used individually by 1 type, and may be used in combination of 2 or more types. The content of the oxidation promoter is also not limited, but it can be exemplified that the oxidation promoter in the exothermic composition is preferably 1 to 30% by mass, preferably 3 to 25% by mass, more preferably 5 to 23% by mass.

It is not intended to limit the present invention, but examples of the oxidizable metal powder include iron powder, zinc powder, aluminum powder, magnesium powder, and copper powder. In addition, for example, iron powder can be exemplified: reduced iron powder, cast iron powder, atomized iron powder, and electrolytic iron powder. These may be used individually by 1 type, and may be used in combination of 2 or more types. The shape of the oxidizable metal powder is also not limited, and powdery, granular, fibrous, and other powdery forms used in conventional disposable warm packs can be exemplified. These may be used individually by 1 type, and may be used in combination of 2 or more types. The content of the oxidizable metal powder is also not limited, but it can be exemplified in the exothermic composition. The oxidizable metal powder is preferably 20 to 80% by mass, preferably 25 to 70% by mass, and more preferably 30 to 60% by mass. .

It is not intended to limit the present invention, but examples of water include distilled water, tap water, ion exchange water, pure water, ultrapure water, industrial water, and the like. The content of water is also not limited, but it can be exemplified that the water in the exothermic composition is preferably 5-50% by mass, preferably 10-40% by mass, and more preferably 15-35% by mass.

In the exothermic composition, in addition to the aforementioned components, if necessary, at least one selected from the group consisting of water-soluble salts and water-retaining agents can be blended.

It is not intended to limit the present invention, but examples of water-soluble salts are: chloride salts or sulfide salts of alkali metals such as sodium and potassium, chloride salts or sulfide salts of alkaline earth metals such as calcium and magnesium, iron, copper, Chloride or sulfide salts of metals such as aluminum, zinc, nickel, silver, and barium. These may be used individually by 1 type, and may be used in combination of 2 or more types. The content of the water-soluble salt is also not limited, but it can be exemplified that the water-soluble salt in the exothermic composition is preferably 0.1-10 mass%, preferably 0.5-7 mass%, more preferably 1-5 mass%.

It is not intended to limit the present invention, but porous materials, water-absorbent resins, etc. can be exemplified as the water-retaining agent, and more specifically, vermiculite, polished iron, calcium silicate, magnesium silicate, kaolin, talc, bentonite, etc. can be exemplified , Mica, bentonite, calcium carbonate, silica gel, alumina, zeolite, silica, diatomaceous earth and other natural and synthetic inorganic substances, wood pulp, wood flour (wood chips), cotton, polyacrylate resin, polysulfonic acid Salt resins, maleic anhydride salt resins, polyacrylamide resins, polyvinyl alcohol resins, polyethylene oxide resins, polyaspartate resins, polyglutamate resins, polyalginic acid Natural and synthetic organic substances such as salt resins, starches, and celluloses. These may be used individually by 1 type, and may be used in combination of 2 or more types. The content of the water-retaining agent is also not limited, and it can be exemplified that the water-retaining agent in the exothermic composition is preferably 1-20% by mass, preferably 3-15% by mass, more preferably 5-10% by mass.

In the exothermic composition, in addition to the aforementioned components, other components that can be used in the exothermic composition can be blended as necessary. It is not intended to limit the present invention, but the above-mentioned components can be exemplified: hydrogen production inhibitors, thickeners, excipients, metal ion chain sealing agents, fragrances, temperature-sensitive ingredients, anti-fatigue ingredients, analgesic ingredients, inflammation-inhibiting ingredients, Various useful ingredients such as blood circulation promoting ingredients, cooling (cooling, refreshing) ingredients, and avoiding ingredients. The other components may be appropriately selected and used depending on the purpose, and may be used singly or in combination of two or more, and the blending amount may also be appropriately selected. From the viewpoint of using the heat generated in the heating element to more effectively play the useful role of the useful ingredients, as for the useful ingredients such as fragrance, it is preferable to use the temperature at which the heat generating composition generates heat in the presence of oxygen (for example, 32~85°C). Around) volatile components.

The exothermic composition can be produced by mixing the aforementioned components as necessary according to a previously known procedure.

It is not intended to limit the present invention, but other components such as the aforementioned useful ingredients can be stored in the same storage bag as the heat generating composition as needed, and may also be stored in a bag different from the heat generating composition, such as at least a part of it. In other storage bags with moisture permeability. From this point of view, when the aforementioned other components are contained in a storage bag different from the heat-generating composition, the heat-generating element can be said to have both a containing bag containing the heat-generating composition and a containing bag containing the aforementioned other components. These storage bags are the same as those used in the previous disposable warm packs, etc., usually those that allow oxygen (air) to pass through the inside and outside of the storage bag, that is, it has air permeability.

Containment bag The storage bag has moisture permeability, and at least a part of the sheet constituting the storage bag is coated with the surfactant.

The storage bag is usually a flat bag shape, and the heat-generating composition and/or the other components are contained in the inner space of the bag, but it is not limited thereto. The shape of the storage bag is not limited. For example, it can be a square shape, a triangle shape, a round shape, an ellipse shape, a foot shape, etc., and it can be any shape.

As for the storage bag, the bag shown in FIGS. 1 and 2 can be exemplified.

In FIG. 1, the heating element 11 has a heat-generating composition 12 and a moisture-permeable storage bag 13 in which the heat-generating composition 12 is housed. At least a part of the storage bag is composed of a moisture-permeable sheet 14. And at least a part of the sheet is coated with a surfactant.

In FIG. 2, the heating element 21 has a heating composition 22 and a moisture-permeable storage bag 23 containing the heating composition 22 inside. The sheet 231 is moisture-permeable and at least a part of which is coated with interface activity The sheet 232 is a sheet that has moisture permeability but is not coated with a surfactant or does not have moisture permeability.

The present invention is not limited to these. For example, in FIG. 2, the sheet 231 and the sheet 232 may both have moisture permeability and be coated with a surfactant. In addition, in Figs. 1 and 2, the sheet material that generally has moisture permeability also has air permeability.

In the storage bag, as long as it has the moisture permeability required for the function of providing heat and/or useful ingredients, the aforementioned adhesive may also be provided.

Furthermore, the heating element is usually packaged in a non-permeable outer bag that does not allow oxygen to penetrate, so as to maintain air tightness for supply and storage. This heating element generates heat from the exothermic composition when it comes into contact with oxygen, and this heat produces the same heating effect as a general warming bag. Furthermore, when the heating element contains the aforementioned useful ingredients, the usefulness derived from the useful ingredients can be obtained. Act on the application site more effectively. Based on the above, in order to prevent the exothermic composition from generating heat before use, the exothermic element is stored in such a way that it does not come into contact with oxygen. Then, the heating element only needs to open the outer bag during use, take out the heating element from the outer bag, and use it by bringing the exothermic composition into contact with oxygen to generate heat. The outer bag used here is not particularly limited as long as it is a non-air permeable bag that does not allow oxygen to penetrate.

As described above, according to the present invention, a heating element can be provided. The heating element contains a heat-generating composition that can generate heat by contact with oxygen in a moisture-permeable storage bag, and the heat-generating element uses moisture permeability The adjusted sheet is prepared by applying 0.1×10 ^-3 mg or more of a surfactant ^{per 1 cm 2 of the coating area to adjust the moisture permeability.} In the heating element of the present invention, the moisture permeability of the sheet will affect the heating element, especially the amount of oxygen supplied to the exothermic composition, and then the heating temperature or the heating speed, especially the heating temperature, is affected according to the amount of oxygen supplied. Make an impact. As described above, the present heating element can be said to use a sheet material with controlled moisture permeability, so that the heating characteristics such as the heating temperature of the heating element can be controlled. [Example]

Hereinafter, examples are shown to explain the present invention in more detail, but the present invention is not limited to these.

Test Example 1 The surface active agent is applied to the sheet and the moisture permeability control test procedure of the sheet is on ^{the resin film side of the laminated sheet (100cm 2} ) formed by laminating the resin film and the nonwoven fabric. According to Table 1, the surfactant is Dilute with water at specific concentrations (0.01%, 0.1%, 0.5%, 1%), and spray 188 mg of the obtained diluted solution evenly on the entire surface of the resin film. After it was completely dried at room temperature (20°C), the moisture permeability was measured in accordance with JIS K7129 (2008). Thereby, each sheet of Examples 1-10 was obtained.

For example, in Table 1, the dilution concentration of the surfactant 1% means that 100 cm ^{2 is} coated with 1.88 mg (188 mg×0.01) of the surfactant (active ingredient). Therefore, at this time, the coating amount of the surfactant per unit area is 0.0188 mg/cm ² .

In addition, the thickness of the laminated sheet used in this test is 0.23mm, and the resin film (made of polyethylene) and the non-woven fabric (made of polyester) are bonded together by spraying the adhesive so that the laminated sheet has moisture permeability. By. The moisture permeability of the laminated sheet before coating used in this test is 364~442g/m ² ･day. Regarding Comparative Examples 1 and 2, instead of the diluent, ethanol was diluted with water (Comparative Example 1) or water (Comparative Example 2) and spray-coated with water (Comparative Example 2), and the moisture permeability was measured for the dried one.

Control evaluation of moisture permeability According to the following formula, the moisture permeability before coating was set to 100, and the moisture permeability after coating relative to the moisture permeability before coating was calculated as the relative moisture permeability. Relative moisture permeability = moisture permeability after coating × 100/ moisture permeability before coating

result The results are shown in Table 1.

例如，表1之實施例1之稀釋濃度1%之相對透溼度「79.0」係表示將塗佈前透溼度設為100%時，藉由塗佈界面活性劑可將其透溼度減低至79.0%。[Table 1]

For example, the relative humidity "79.0" of the dilution concentration of 1% in Example 1 of Table 1 means that when the humidity before coating is set to 100%, the water vapor permeability can be reduced to 79.0% by coating the surfactant .

As shown in Table 1, even if water was applied to the aforementioned sheet, the moisture permeability of the sheet did not change. In addition, even if ethanol is applied, the moisture permeability of the sheet cannot be controlled.

In contrast, it has been confirmed that when the surfactant is applied, the moisture permeability of the sheet can be changed according to the applied amount. In addition, the degree of change in the confirmed moisture permeability also varies according to the type of surfactant. It can be seen from the above that by coating the surfactant on the sheet, the moisture permeability of the sheet can be controlled. In particular, it can be seen that since at least a part of the sheet material is coated with a surfactant at least 0.1×10 ^{-3 mg per 1 cm 2 of the} coating area, the moisture permeability of the sheet can be controlled according to the type of surfactant or the amount of coating. . In addition, when it is confirmed that it is an amphoteric surfactant or a cationic surfactant, even when it is applied in a very small amount, the moisture permeability of the sheet can be effectively changed.

The sheet used in this test is an air-permeable sheet and a moisture-permeable sheet for a heat-generating element having a heat-generating composition that can generate heat by contact with oxygen. It can be seen from the above that by coating the surfactant as described above, the moisture permeability of the sheet can be controlled.

Test example 2: Preparation of heating element ＜Sheet material＞ In the same manner as when the 1% dilution of Example 1 of Test Example 1 was used, a surfactant was applied to the aforementioned laminated sheet, and the moisture permeability of the sheet was changed. Furthermore, the size of the sheet formed by bonding the resin film and the non-woven fabric used in this test example is 13cm×9.5cm, and the surfactant is uniformly sprayed on one side of the sheet (the surface of the resin film side), and the room Dry at warm temperature. The coating amount of the surfactant (active ingredient) per unit area, and the moisture permeability of the sheet before and after coating of the surfactant are the same as those of the aforementioned Test Example 1.

＜Containment bag＞ The sheet material obtained as described above and the non-air-permeable sheet material having an adhesive surface on one side were formed into a bag shape by heat fusion, and a storage bag (13 cm×9.5 cm) with moisture permeability on one side was prepared. The storage bag is also breathable.

＜Exothermic composition＞ Iron powder, activated carbon, water, vermiculite, water-absorbent resin, and salt are mixed to obtain a heat-generating composition. Here, the contents of iron powder, activated carbon, water, vermiculite, water-absorbent resin, and salt in the exothermic composition are respectively set to 50% by mass, 12% by mass, 30.5% by mass, 2% by mass, 3.5% by mass, 2% by mass.

＜heating parts＞ The exothermic composition obtained as described above is contained in the aforementioned storage bag and sealed. Thereby, a heat-generating element of a heat-generating composition that can generate heat by contact with oxygen is produced in a moisture-permeable storage bag coated with a surfactant at least a part of the sheet. As mentioned above, in the heating element, at least a part of the sheet material is coated with a surfactant to control the moisture permeability of the sheet material. The heating element is then quickly stored in the non-breathable outer bag for the disposable warm package.

11: Heating parts 12: Exothermic composition 13: Containment bag 14: A sheet with moisture permeability and at least a part of which is coated with a surfactant 21: heating element 22: Exothermic composition 23: Containment Bag 231: A sheet with moisture permeability and at least a part of which is coated with a surfactant 232: sheet

Figure 1 shows an example of a storage bag. Figure 2 shows an example of a storage bag.

(no)

Claims (3)

A heating element which contains a heat-generating composition in a moisture-permeable storage bag, the heat-generating composition can generate heat by contact with oxygen, and is used in the moisture-permeable sheet constituting the storage bag At least a part of it is coated with more than 0.1×10 ^-3 mg of surfactant ^{per 1 cm 2.} The heating element according to claim 1, wherein the aforementioned sheet material is at least one selected from the group consisting of a moisture-permeable resin film, non-woven fabric, and woven fabric. The heating element of claim 2, wherein the aforementioned resin film having moisture permeability is a thermoplastic resin film having moisture permeability.

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