WO2014157724A1

WO2014157724A1 - Heat generating composition, and disposable body warmer

Info

Publication number: WO2014157724A1
Application number: PCT/JP2014/059549
Authority: WO
Inventors: 美歌子中林
Original assignee: 興和株式会社
Priority date: 2013-03-29
Filing date: 2014-03-31
Publication date: 2014-10-02
Also published as: JPWO2014157724A1

Abstract

The present invention addresses the problem of providing: a heat generating composition that is capable of generating heat in the presence of air, and emitting a fragrance; and a disposable body warmer using the composition. A heat generating composition which contains an oxidisable metal powder, an inorganic electrolyte, water, a carbon component, a water-retention agent, and a fragrance component, and generates heat in the presence of air. A conductive carbon material comprising carbon black or graphite, and having an average particle size of 10-100 nm is used as the carbon component, and the fragrance adsorption surface area of the conductive carbon material in the quantity used in the heat generating composition is 1.0-7.4m² per 1g of the heat generating composition. The heat generating composition is housed in an air-permeable bag to produce a disposable body warmer.

Description

Exothermic composition and disposable body warmer

The present invention relates to a heat generating composition that generates heat in the presence of air and a disposable body warmer provided with the heat generating composition.
More specifically, the present invention relates to a heat generating composition capable of generating heat in the presence of air and emitting aroma, and a scented disposable body warmer.

Conventionally, a scented disposable body warmer in which an aromatic component is added to an exothermic composition or an air-permeable bag body containing the exothermic composition is known.
However, the conventional scented disposable warmer has a problem that the activated carbon contained in the exothermic composition adsorbs the fragrance component between the production and the start of use, and there is almost no fragrance at the time of opening.

In view of the current situation, Patent Documents 1 to 4 propose exothermic compositions and scented disposable warmers in which measures are taken so that the scent is not adsorbed by the activated carbon.

For example, in Japanese Patent Application Laid-Open No. 2007-236725 (Patent Document 1), a fiber layer, a breathable sheet layer, a heat generating composition layer, a breathable or non-breathable sheet layer, an adhesive layer, and a release sheet layer are provided in this order. The exothermic composition layer is a exothermic structure enclosed in a bag body formed of a breathable sheet layer and a breathable or non-breathable sheet layer, and the fiber layer has an aroma, antiseptic, and anti-flame Heat-generating structures having microcapsules that contain analgesic, deodorant, antioxidant, antibacterial or bactericidal components have been proposed.

Japanese Patent Application Laid-Open No. 2010-042662 (Patent Document 2) discloses a disposable body warmer in which a heat-generating composition that generates heat in the presence of air is sealed in a flat bag having air permeability. A coating film of microcapsules formed by confining aroma oil in a capsule container is formed on the entire surface, one surface, or part of the capsule container, and the capsule container has a shielding property that can suppress the aroma of the aroma oil in the container, and There has been proposed a scented disposable body warmer having a capsule strength that is broken by hand-squeezing the flat bag and has a capsule strength that escapes fragrance.

Japanese Patent Application Laid-Open No. 2010-051690 (Patent Document 3) includes a heat generating portion containing an oxidizable metal and activated carbon, and a bag body that is at least partially breathable and that houses the heat generating portion. There has been proposed a heating tool which is perfumed with a fragrance composition containing the component A.

In Patent Document 3, the specific component A of the heating tool is a chain monoterpene alcohol, sesquiterpene alcohol, monoterpene alcohol or alicyclic alcohol acetate, methyl dihydrojasmonate, ionone, or It is Damascon, and by using these, it is said that the scenting at the time of using the heating tool is sufficient, and the change of the scent during storage can be effectively prevented.

Further, in Japanese Patent Application Laid-Open No. 2011-160885 (Patent Document 4), a heat generating part containing an oxidizable metal and activated carbon, and a bag body having air permeability at least partially and containing the heat generating part are provided. The ratio of the sum of the masses of component A and component B and the mass of activated carbon [(component A + component B) / activated carbon] is added by the fragrance composition containing specific component A and component B. Heating tools that are 0.04 to 0.2 have been proposed.

In Patent Document 4, the specific component A in the heating tool is a monoterpenoid having a cyclic ether structure, and the specific component B is a monoterpenoid having a cyclic ketone structure, and these are specified ratios relative to activated carbon. By containing in, effectively prevents the change in the quality of the refreshing feeling during storage, the refreshing feeling is maintained, the balance between the refreshing feeling and the stimulating feeling when using the heating tool becomes very good. It is said.

JP 2007-236725 A JP 2010-046262 A JP 2010-051690 A JP 2011-160885 A

In the exothermic structure described in Patent Document 1 and the disposable scented warmer described in Patent Document 2, the fragrance-containing microcapsule is held on the surface of the bag body, and fragrance is obtained by rubbing during use. Is configured to start.
Therefore, at the time of production, a number of steps are required to encapsulate the fragrance in the microcapsule or to hold the microencapsulated fragrance on the surface of the bag.

In addition, if the strength of the microcapsule is too strong, it cannot be destroyed by rubbing by hand, and if it is too weak, the microcapsule may be destroyed not only during production but also during transportation or storage, There is a drawback that it is difficult to adjust to an appropriate strength for manufacturing.

Furthermore, if the rubbing force is insufficient during use, the microcapsules may not be destroyed and aroma may not start.
In particular, in the case of a type of body warmer that is used by attaching it to underwear or the like, a method of rubbing the surface of the body warmer inside the clothes is very inconvenient.

In the heating tool described in Patent Documents 3 and 4, since the components selected and used as the fragrance or fragrance composition are limited to specific components, the selection of the fragrance or fragrance composition is limited. , There was a drawback that you can not use your favorite fragrance.

In view of the present situation, the present invention can be easily manufactured using a fragrance component such as a desired fragrance, and in use, heat is generated in the presence of air, and the bag body is simply opened without adsorbing the fragrance component. The heat generating composition that can emit the desired fragrance and the disposable body warmer were studied earnestly.

As a result, instead of the conventionally used activated carbon, a conductive carbon material having a specific average particle size is used in a surface area that adsorbs the fragrance as a carbon component by using an amount of the surface area that adsorbs the fragrance in a specific range. The heat-generating composition that can maintain the heat-generating performance of the disposable body warmer while reducing the adsorption of aromatic components as much as possible has been found.

That is, the present invention provides a exothermic composition that can be easily manufactured using a desired fragrance, and emits a fragrance just by opening a bag, and a disposable body warmer using this exothermic composition. It is for the purpose.

In order to achieve the above object, the invention according to claim 1 of the present invention includes an oxidizable metal powder, an inorganic electrolyte, water, a carbon component, a water retention agent, an aromatic component, and the presence of air. An exothermic composition that generates heat below,
The carbon component is a conductive carbon material having an average particle size of 10 to 100 nm, and the content thereof is 1.0 to 7.4 m ² perfume adsorption surface area per 1 g of the exothermic composition. Exothermic composition.

According to a second aspect of the present invention, in the exothermic composition according to the first aspect, the conductive carbon substance is carbon black or graphite.

According to a third aspect of the present invention, in the exothermic composition according to the first or second aspect, the conductive carbon substance has a specific surface area of 10 to 400 m ² / g.

According to a fourth aspect of the present invention, in the exothermic composition according to any one of the first to third aspects, the conductive carbon substance is 0.1 to 10% by mass relative to the entire exothermic composition. It is characterized by being contained.

The invention according to claim 5 of the present invention includes an oxidizable metal powder, an inorganic electrolyte, water, a carbon component, and a water retention agent, and the carbon component has an average particle size of 10 to 100 nm. An exothermic carbon material, the content of which is such that the perfume adsorption surface area per gram of the composition is 1.0 to 7.4 m ^2, and an exothermic composition that generates heat in the presence of air;
A bag body having air permeability at least in part and containing the exothermic composition;
A disposable body warmer comprising an aromatic component added to the exothermic composition and / or the bag.

In the exothermic composition according to the present invention, a conductive carbon substance having a specific average particle size is selected as the carbon component, and the perfume adsorption surface area in a specific amount of the exothermic composition is specified. Performance can be obtained, and a desired fragrance can be emitted at the time of heat generation without adsorbing the fragrance component between production and start of use.

In particular, the exothermic composition of the present invention does not require special processing such as microencapsulation at the time of production, and a desired aromatic component is contained in a bag body (breathable bag) containing the exothermic composition and / or exothermic composition. A heating element or a disposable body warmer that can emit fragrance can be easily produced simply by adding to the body.

In this case, since the conductive carbon material having a large heat generation effective surface area is used as the carbon component in this invention, the content is reduced in order to reduce the fragrance adsorption surface area of the carbon component for the purpose of suppressing the adsorption of the fragrance component. However, good exothermic performance can be obtained without affecting the catalytic action of the carbon component in the oxidation reaction.

It is a schematic diagram which shows the mechanism of the heat_generation | fever at the time of using iron powder as an oxidizable metal powder. It is a graph which shows the relationship between a fragrance | flavor adsorption | suction surface area and rise time.

Hereinafter, embodiments of the exothermic composition and the disposable body warmer according to the present invention will be specifically described, but the present invention is not limited to the following examples.

The exothermic composition of the present invention contains an oxidizable metal powder, an inorganic electrolyte, water, a carbon component, and a water retention agent, and generates heat in the presence of air, and is used for a disposable body warmer. It is.

Before describing the exothermic composition of the present invention, the mechanism of heat generation when iron powder is used as the oxidizable metal powder will be described with reference to FIG.
As shown in FIG. 1, electrons flow from the iron powder to the carbon component, and oxygen is reduced on the surface of the carbon component.
At that time, the reaction may proceed in the absence of a carbon component.
In this case, it is considered that oxygen reduction occurs on the surface of the iron powder, and since the rate of this oxygen reduction reaction is slow, only slight heat generation occurs.

On the other hand, when a carbon component is present, the carbon component plays a role similar to that of a positive electrode of a battery that causes a reduction reaction of oxygen. Therefore, it is considered that the reaction is promoted catalytically.
Thus, the carbon component plays an important role in causing the reaction to proceed smoothly in the oxidation reaction of the oxidizable metal powder.

Normally, activated carbon contained in a heating element or disposable body warmer is a substance with a large specific surface area having a large number of pores, and has three types of pores with different sizes of micropores, mesopores, and macropores. .
Therefore, since it has high adsorption performance with respect to a wide range of components, when it is used together with an aroma component for a disposable scented warmer, the aroma component is adsorbed by the start of use.

In order to suppress the adsorption of the aromatic component due to the size of the specific surface area, it is conceivable to reduce the surface area used for the adsorption of the aromatic component by reducing the content of activated carbon contained in the exothermic composition. .

However, although the adsorption of aromatic components can be reduced by reducing the amount of activated carbon used, as described above, activated carbon as a carbon component is a catalyst for smoothly proceeding the oxidation reaction of the oxidizable metal powder. Therefore, in order to obtain sufficient heat generation performance as a disposable body warmer, it is necessary to contain a certain amount of activated carbon.

Therefore, when using activated carbon as the carbon component, the heat generation performance desired as a disposable body warmer cannot be obtained by simply reducing the content of the activated carbon to suppress the adsorption of the aroma component.

Therefore, in the present invention, a conductive carbon material, which is a highly conductive carbon material, is selected as the carbon component instead of the conventionally used activated carbon, and has a specific average particle diameter. And is used in such an amount that the surface area for adsorbing fragrance components such as fragrances falls within a specific range.
By selecting such a carbon component, heat generation performance as a heating element or a disposable body warmer can be maintained while suppressing the adsorption of the aromatic component in the carbon component as much as possible.

That is, in this invention, a conductive carbon substance is used as the carbon component.
Examples of the conductive carbon material include carbon black and graphite.

According to the mechanism of the heat generation (oxidation reaction), in order to exchange electrons between the oxidizable metal powder particles and the carbon component, it is necessary that the oxidizable metal powder particles and the carbon component are sufficiently in contact with each other. I understand.
Therefore, in order to form a good contact state with the oxidizable metal powder, the average particle size of the carbon component is 10 to 100 nm, and more preferably 19 to 78 nm.

In the present invention, by using relatively small particles as the carbon component relative to the oxidizable metal powder particles, it becomes possible to provide a heat generation effective surface that can be used for energization of almost the entire surface of the carbon component. ing.

When large particles having an average particle diameter exceeding 100 nm are used as the carbon component, the contact state between the oxidizable metal powder particles and the carbon component is deteriorated.
In addition, only a part of the surface of the carbon component that is in contact with the oxidizable metal powder particles can be used for energization, and not only the heat generation effective surface area becomes small, but also more carbon components to make the oxidation reaction proceed smoothly. Is not preferable in terms of cost and usability.

When the average particle size of the carbon component is too small, there is a concern such as powder scattering during production or leakage from the air-permeable bag, and therefore, as the carbon component, using small particles having an average particle size of less than 10 nm It is not preferable.

In the present invention, a conductive carbon material having an average particle size of 10 to 100 nm is used in consideration of the effective heat generation surface area of the carbon component (surface area where the carbon component can come into contact with the oxidizable metal powder). ing.
Therefore, even if the fragrance adsorption surface area of the carbon component is reduced for the purpose of suppressing the adsorption of the fragrance component and the content thereof is reduced, good exothermic performance can be obtained without affecting the catalytic action of the carbon component in the oxidation reaction. .
In addition, the said average particle diameter is a primary particle diameter, for example, the particle diameter of 20 particles or more is measured by electron microscope observation, and is obtained by the average.

Furthermore, in the exothermic composition of the present invention, the carbon component is used in such an amount that a surface area (hereinafter also referred to as a fragrance adsorption surface area) that can adsorb an fragrance component such as a fragrance is in a specific range.

In the present invention, the “perfume adsorption surface area” means a surface area that may adsorb an aromatic component, and can be determined by the following formula.
Perfume adsorption surface area (m ² / g) = specific surface area of conductive carbon substance (m ² / g) × conducting carbon substance content in exothermic composition (g) / total weight of exothermic composition (g)

The specific surface area can be measured by, for example, the BET adsorption method, and the specific surface area value in the present invention is measured by this method except for specific components.

The content of the conductive carbon material used in the present invention is such that the perfume adsorption surface area per 1 g of the composition is 1.0 to 7.4 m ² , more preferably 1.2 to 7.3 m ^2. This is the amount.
Therefore, in this invention, since the conductive carbon material having a specific surface area as described above is used as the carbon component, the conductive carbon material is a fragrance component such as a fragrance during the period from manufacture to start of use. Will not be absorbed.

With respect to the specific surface area of the conductive carbon material, the content of the conductive carbon material used may be such that the perfume adsorption surface area per gram of the heat generating composition is 1.0 to 7.4 m ^2. Although it may be selected, it is preferably 10 to 400 m ² / g.

Note that the content of the conductive carbon substance may be within the range of the specific perfume adsorption surface area, but is 0.1 to 10% by mass, more preferably 1 to 7%, based on the entire exothermic composition. % By mass.
If it is less than 0.1% by mass, sufficient heat generation performance as a heating element or a disposable body warmer cannot be obtained, and conversely even if it exceeds 10% by mass, the oxidation reaction is not further promoted. , Tend to be uneconomical.

In addition, when the conductive carbon substance having a purity of 90% or more is used, the amount used can be reduced as compared with conventionally used activated carbon, and the amount of the exothermic composition can be reduced. It is easy, easy to use, not bulky when used, and economical.

The oxidizable metal powder used in the present invention is not particularly limited as long as it easily reacts with oxygen in the air and generates heat during the reaction.
Examples thereof include reduced iron powder, atomized iron powder, and iron iron powder.
As the iron powder, a small amount of active iron powder, for example, active iron powder described in Japanese Patent No. 3341020 may be used.
The content of the oxidizable metal powder in the exothermic composition is usually 30% by mass or more, preferably 40% by mass or more, more preferably 45% by mass or more, and usually 80% by mass or less, preferably 70% by mass. Hereinafter, it is more preferably 65% by mass or less.

The inorganic electrolyte used in the present invention can be added to the exothermic composition in the form of an electrolyte solution.
Examples of such an electrolyte solution include aqueous solutions of sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and the like.
The content of the inorganic electrolyte in the exothermic composition is usually 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 1% by mass or more, and usually 15% by mass or less, preferably 10% by mass. % Or less, more preferably 5% by mass or less.

Examples of the water retention agent used in the present invention include silica, vermiculite, a water-absorbing polymer, and wood powder.

Examples of the water-absorbing polymer include sodium polyacrylate, crosslinked polyacrylate, polyvinyl alcohol, polyvinyl pyrrolidone, gum arabic, crosslinked polyalkylene oxide, water-soluble cellulose ether, poly-N-vinylacetamide, hydroxyethyl cellulose, methyl cellulose, Examples include sodium alginate, pectin, acrylic sulfonic acid polymer material, gelatin, polyethylene oxide, carboxymethyl cellulose and the like.
The content of the water retention agent in the exothermic composition is usually 2% by mass or more, preferably 3% by mass or more, more preferably 5% by mass or more, and usually 30% by mass or less, preferably 25% by mass or less, and more. Preferably it is 20 mass% or less.

The aromatic component used in the present invention is not particularly limited as long as it is volatilized at room temperature or at an exothermic temperature of the exothermic composition.

Examples of the aromatic component include benzaldehyde, α-pinene, geraniol, citronellal, linalool, limonene, menthol, linalyl acetate, amylcinnamic aldehyde, methyl anthranilate, isoeugenol, allyl caproate, isobutyl acetate, benzyl acetate, and salicylic acid. Fragrances containing isoamyl, citral, decylaldehyde, hydroxycitronellal, isoamyl acetate, and plant essential oils with an aromatic deodorizing effect, such as bitter almond oil, cypress oil, nutmeg oil, geranium oil, lavender oil, lime Examples thereof include, but are not limited to, oil, peppermint oil, vetiver oil, sweet orange oil, and thyme oil.

The addition of the fragrance component is not particularly difficult, and may be mixed in the exothermic composition, or may be added to a breathable bag that encloses the exothermic composition.

The content of the fragrance component is 0.1 to 3% by mass, more preferably 0.5 to 2.5% by mass.

The method of adding the fragrance component to the exothermic composition is not particularly difficult, and a conventionally used method may be employed.
For example, it is possible to employ a method in which the aromatic component held in paper or an excipient such as calcium silicate is mixed with other raw materials.

When the fragrance component is added to the breathable bag body, for example, the fragrance component may be mixed with an appropriate binder and applied to the bag body, or an adhesive that forms one surface of the breathable bag body. It can also be added to the agent.
Examples of such adhesives include rubber adhesives such as natural rubber and synthetic rubber, and acrylic adhesives such as n-butyl methacrylate.

To the exothermic composition of the present invention, other components than the above components can be appropriately added within a range not impairing the effects of the present invention.
Examples of such components include a hydrogen generation inhibitor.
The water contained in the exothermic composition can be used for both distilled water and tap water, and the content in the exothermic composition is usually 1% by mass or more, preferably 5% by mass or more, more preferably 10%. It is 40 mass% or less normally, Preferably it is 35 mass% or less, More preferably, it is 30 mass% or less.

The exothermic composition of this invention can be accommodated in a breathable bag and used as a disposable body warmer.
In particular, like the conventional disposable body warmer, the exothermic composition of the present invention is housed in a bag body (inner bag) that is at least partially breathable, and the inner bag is made of a non-breathable packaging material. It can also be sealed and packaged in the body (outer bag), and the inner bag can be taken out from the outer bag and used at the time of use.

Examples of the breathable bag or inner bag include a breathable bag formed of a breathable sheet formed by laminating a nylon nonwoven fabric and porous polyethylene, and nylon is used for the outermost layer, and polyethylene is used for the inner layer. It is possible to use a breathable bag formed of a sheet formed by laminating a film and further laminating a film made of linear low density polyethylene (LLDPE) having good heat-fusibility inside.
The breathable bag body or inner bag is not limited to these, and can be composed of, for example, a breathable film, paper, nonwoven fabric, woven fabric, or the like.

The breathable film can be made into a film, and is particularly limited as long as it can exhibit breathability by a method such as stretching and / or extraction of a soluble filler or perforation with an ultrafine needle. is not.

As such a breathable film, specifically, for example, polyethylene, polypropylene, cellophane, polyester, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, ethylene vinyl acetate copolymer, polycarbonate, hydrochloric acid Rubber etc. are mentioned.
Among these, those made of polyolefin resin are preferable because a homogeneous air permeable film can be obtained by stretching or the like.

Examples of the polyolefin-based resin include homopolymers or copolymers such as polyethylene, polypropylene, and polybutadiene, or blend polymers thereof.
In particular, polypropylene (PP), high density polyethylene (HDPE), and linear low density polyethylene (LLDPE) are preferable from the above viewpoint.

The breathable bag body may be provided with an adhesive layer on one surface.
The pressure-sensitive adhesive that can be used to form such a pressure-sensitive adhesive layer is not particularly limited as long as it has good adhesion to underwear and skin.

Specifically, for example, vinyl adhesive, vinyl acetate adhesive, polyvinyl acetal adhesive, vinyl chloride adhesive, cellulose adhesive, chloroprene (neoprene) adhesive, acrylic adhesive, nitrile rubber And a layer formed of an adhesive such as a styrene-based adhesive, a styrene rubber-based adhesive, a silicone rubber-based adhesive, a polysulfide-based adhesive, a terpene resin, or a water-soluble rosin.
When providing an adhesive layer, it is preferable to cover with a release paper to prevent the adhesive layer from being soiled before use.

As a material constituting the bag body (outer bag) made of the non-breathable packaging material, transparent vapor deposited PET film, biaxially oriented polypropylene plus polyethylene film laminated film, polyvinylidene chloride, polyamide, nylon, metal vapor deposited film, Metal oxide vapor-deposited film, metal stay laminated film, EVOH (ethylene / vinyl alcohol copolymer, ethylene / vinyl acetate copolymer saponified product) single film, or a film laminated with another film and polyethylene, A composite film or a multilayer film bonded with a heat-fusible film such as polypropylene can be used.
These films are formed into a bag body, for example, by superimposing such that the surfaces of the heat-fusible film are inside each other and heat-sealing the periphery.

Hereinafter, the heat generating composition of the present invention and the disposable body warmer provided with the same will be described in more detail by way of specific examples.
Note that the present invention is not limited to these examples.

<Examples 1 to 3 and Comparative Examples 1 and 2>
1. Production Method Using the carbon components shown in Table 1 below, 19 g of a heat-generating composition was prepared based on the formulation shown in Table 2 below, and the fragrance comprising calcium silicate impregnated with 0.5 g of lavender fragrance. 1 g of component was mixed to obtain 20 g of a heating element material (exothermic composition).
The obtained raw material was encapsulated in a 93 mm × 55 mm breathable bag formed of a breathable sheet formed by laminating a nylon nonwoven fabric and a polyethylene film to make a needle hole.
This was further sealed in a non-breathable outer bag formed of a transparent vapor-deposited PET film to produce a scented disposable body warmer.

<Evaluation Example 1>
For the heating element raw materials (exothermic compositions) obtained in Examples 1 to 3 and Comparative Examples 1 and 2, the heat generation rise time, that is, the time from the start of heat generation to the temperature reaching 40 ° C. (T minutes) by the following method Was measured. The results are shown in Table 4.

<Measurement method>
The warmers obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were previously left in the measurement chamber (temperature 25 ° C.) and allowed to acclimatize to room temperature.
Thereafter, the body was opened and heat generation was started.
Cairo was wrapped with a towel (pile fabric, 100% cotton), the surface temperature of the warmer was measured, and the time until this temperature reached 40 ° C. was defined as the exothermic rise time.

<Result>
The exothermic compositions of the present invention obtained in Examples 1 to 3 all have an exothermic rise characteristic equal to or higher than that of the exothermic composition obtained in Comparative Example 2, which is an exothermic composition containing activated carbon as a carbon component. I understand that.
On the other hand, the heating element raw material (exothermic composition) obtained in Comparative Example 1 has a fragrance adsorption surface area adjusted by reducing the amount of activated carbon so as not to adsorb an aromatic component.
By this adjustment, in the heating element raw material obtained in Comparative Example 1, adsorption of the aroma component is suppressed, but the heat generation performance is inferior.

<Evaluation Example 2>
Regarding the heating element raw materials obtained in Example 1 and Comparative Example 1, the fragrance adsorption surface area of the exothermic composition (19 g) was changed by changing the blending ratio of the carbon component, and the rise time of heat generation was measured by the following method. Went.
The relationship between 1 / T (× 100) and the perfume adsorption surface area of the exothermic composition (19 g) is shown in Table 5 and FIG.

<Result>
It can be seen that the exothermic composition of the present invention has an exothermic rise characteristic superior to the exothermic composition obtained in Comparative Example 1 which is an exothermic composition containing activated carbon as a carbon component.
Therefore, as in the case of the evaluation example 1, it is apparent that when activated carbon is used by adjusting the surface area in consideration of the adsorption of the fragrance, it is not suitable as a disposable body warmer.

<Evaluation Example 3>
The body warmers obtained in Examples 1 to 3 and the body warmers obtained in Comparative Examples 1 and 2 are stored at a temperature of 50 ° C., and after a certain period of time, the outer bag is taken out to check whether or not the smell can be confirmed. did.
The results are shown in Table 6.

<Result>
All of the warmers of the present invention obtained in Examples 1 to 3 were confirmed to smell.
On the other hand, in the warmer obtained in Comparative Example 2, when the same amount of activated carbon as carbon black was used, the aroma component was adsorbed, and the smell could not be confirmed every time the period passed.
In addition, although the adsorption | suction of a fragrance | flavor component was suppressed in the heat generating body raw material obtained in the comparative example 1, the heat_generation | fever performance is inferior and it is unsuitable as a disposable warmer as above-mentioned.

According to the exothermic composition of the present invention, since the surface area for adsorbing the fragrance for fragrance is small, the fragrance component is not adsorbed during the period from manufacture to start of use. Can be planned.

Claims

An exothermic composition containing an oxidizable metal powder, an inorganic electrolyte, water, a carbon component, a water retention agent, and an aroma component and generating heat in the presence of air,
The carbon component is a conductive carbon material having an average particle diameter of 10 to 100 nm, and the content thereof is characterized in that a perfume adsorption surface area per 1 g of the exothermic composition is 1.0 to 7.4 m 2. Exothermic composition.
The exothermic composition according to claim 1, wherein the conductive carbon material is carbon black or graphite.
3. The heat generating composition according to claim 1, wherein the conductive carbon material has a specific surface area of 10 to 400 m 2 / g.
The exothermic composition according to any one of claims 1 to 3, wherein the conductive carbon substance is contained in an amount of 0.1 to 10 mass% with respect to the entire exothermic composition.
It contains an oxidizable metal powder, an inorganic electrolyte, water, a carbon component, and a water retention agent, and the carbon component is a conductive carbon material having an average particle size of 10 to 100 nm. An exothermic composition that has a perfume adsorption surface area per gram of 1.0 to 7.4 m 2 and generates heat in the presence of air;
A bag body having air permeability at least in part and containing the exothermic composition;
A disposable body warmer comprising an aromatic component added to the exothermic composition and / or the bag.