JP2001137273A - Disposable body warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable body warmer which can achieve an excellent warming effect and use a used exothermic agent as a fertilizer. SOLUTION: In the disposable body warmer, the exothermic agent contains at least iron powder, a calcium salt and water, and the calcium salt is a mixture containing one kind of calcium chloride and calcium sulfate, or at least two kinds of calcium chloride, calcium sulfate and calcium citrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable body warmer containing an exothermic composition which generates heat in the presence of air.

[0002]

2. Description of the Related Art A disposable body warmer that generates heat in the presence of air is a heat-generating composition containing metal powder (iron powder, etc.), a reaction aid (halide), water, activated carbon, and the like. It is stored and sealed in an outer bag made of a non-breathable packaging material until it is used, and the inner bag is taken out of the outer bag and used when used. In recent years, this type of disposable body warmer has been developed to be provided with an adhesive and directly adhered to a human body or underwear, and can be used as a medical device, thereby increasing its usefulness.

[0003] In these disposable warmers, sodium chloride is often used as the reaction aid. However, Japanese Patent Application Laid-Open No. 2-265545 discloses potassium chloride and magnesium chloride in addition to sodium chloride. , Calcium chloride and the like are also described. However, there has been no case in which anything other than sodium chloride has been used as a reaction aid, and there is no disclosure of the usefulness of a reaction aid other than sodium chloride.

On the other hand, recently, under the protection of the global environment, the recycling of resources, the problem of dioxins, and the like have been actively pointed out. Effective utilization and disposal methods are required.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a recyclable disposable body warmer which has a sufficient heat generation temperature and duration and is environmentally friendly.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have housed a heating agent in a bag made of a film having air permeability, and have at least a heating agent. It has been found that a disposable body warmer containing iron powder, calcium salt and water has a sufficient exothermic temperature and exothermic time, and that the exothermic agent after use can be used as a fertilizer.

That is, the present invention provides a heating agent for a disposable body warmer, which contains at least iron powder, calcium salt, and water, wherein the calcium salt is one of calcium chloride and calcium sulfate, or calcium chloride, calcium sulfate, citrate. A disposable body warmer characterized by being a mixture containing two or more of calcium acid.

Further, the present invention provides a disposable body warmer wherein the calcium salt is a mixture of calcium chloride, calcium sulfate and calcium citrate, and the mixture weight ratio is 10: 5: 3.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the disposable body warmer of the present invention will be described in more detail.

First, the exothermic agent used in the disposable body warmer of the present invention will be described. The exothermic agent according to the present invention contains at least iron powder, calcium salt, and water, and may optionally contain activated carbon, vermiculite, wood flour, and the like.

The feature of the exothermic agent of the present invention is that a calcium salt is used as the exothermic agent, and that calcium chloride, calcium sulfate and calcium citrate are used among the calcium salts. By using a calcium salt as a heating agent, after using a disposable body warmer, the heating agent can be used as an effective fertilizer.

Needless to say, the disposable body warmer of the present invention has a sufficient heating effect through the human body or clothing which is conventionally desired for the disposable body warmer. It can have a performance of 60 ° C. and a heat generation duration of 10 hours or more.

Each component in the exothermic agent of the disposable body warmer of the present invention will be specifically described.

The content of iron powder in the exothermic agent in the disposable body warmer of the present invention is preferably 30 to 65% by weight. If it is less than 30% by weight, a sufficient heat generation temperature cannot be obtained. On the other hand,
When the content of iron powder exceeds 65% by weight, the exothermic temperature is 60 ° C.
, And the weight of the disposable body warmer is increased, and the fit to the application portion is also deteriorated.

The type of iron powder is not particularly limited.
Among them, reduced iron powder produced by reducing ore and the like, atomized iron powder produced by spraying from a solution, cast iron powder produced by crushing cast iron material as a raw material, and more preferably reduced iron powder or atomized A mixture of iron powder and cast iron powder is preferred because the desired heat generation rises quickly.

The content of the calcium salt is 1.5 to 1.5 in the exothermic agent.
5% by weight is preferred. If the content of calcium salt is less than 1.5% by weight, it takes a long time to obtain a sufficient exotherm, while if it exceeds 6% by weight, the exothermic reaction progresses rapidly, so that the disposable body warmer usually requires 10 hours or more. Cannot be obtained and the heat generation tends to end in a short time.

Further, when calcium salt is used, unlike sodium chloride, which has been frequently used as a composition of a heating agent, a used heating agent can be used as a fertilizer. Provision is possible. The calcium salt is not particularly limited, but may be one of calcium chloride, calcium sulfate, calcium citrate, calcium oxide, calcium phosphate, calcium carbonate, calcium bromide, calcium hydroxide, calcium nitrate, calcium iodide, and calcium nitrite. Species or two or more species are selected and used. In particular, a mixture of two or more species selected from calcium chloride, calcium sulfate, calcium citrate and the like is preferably used. Among the calcium salts, calcium chloride,
A mixture of three kinds of calcium sulfate and calcium citrate is often used as a fertilizer for plants, and the weight ratio of calcium chloride: calcium sulfate: calcium citrate is 10:
Although the 5: 3 mixture is used as a particularly effective fertilizer, the present invention is the first one to be used as a heating agent for a disposable body warmer. And the exothermic agent after use can be a particularly effective fertilizer.

The content of water in the exothermic agent is 15 to 30.
% By weight is preferred. If the amount is less than 15% by weight, the durability of heat generation is not sufficient. On the other hand, if the amount exceeds 30% by weight, the iron is too wet and the reaction is hindered.

The disposable body warmer of the present invention is preferably blended with activated carbon, in which case the activated carbon content is
5 to 15% by weight of the exothermic agent is preferred. The content is preferably 5% by weight or more in order to cause the iron powder to react. On the other hand,
If the content of the activated carbon exceeds 15% by weight, the fit to the stuck portion tends to be poor.

Further, when vermiculite, wood flour and the like are mixed in the exothermic agent, the content thereof is 6 to 15 in the exothermic agent.
% By weight is preferred. If the amount is less than 6% by weight, the durability of heat generation tends to be short, while if it exceeds 15% by weight, the fit tends to be poor.

Next, the inner bag of the disposable body warmer of the present invention provided with the above exothermic agent will be described.

The exothermic agent of the disposable body warmer of the present invention is not particularly limited, but usually, a film having air permeability is formed into a bag and stored therein. The film having air permeability is not particularly limited, but nonwoven fabrics, porous sheets (trade name: NF sheet (manufactured by Tokuyama Soda Co., Ltd.), trade name: Serpore (manufactured by Sekisui Chemical Co., Ltd.), trade name: Breslon (manufactured by Nitto Denko Corporation) ), Etc., a laminated sheet of nonwoven fabrics and porous sheets,
A non-woven fabric laminated with a plastic film laminated with a blade and mechanically perforated with a blade or the like, or
A nonwoven fabric or a porous sheet, which is obtained by laminating a plastic film provided with a vent beforehand is applied, and particularly preferably, a laminated sheet of a porous sheet and a nonwoven fabric or a polyethylene fiber is laminated and heated and pressed. The air permeable sheet manufactured by using is used.

On the other hand, the disposable body warmer of the present invention can be configured so as to be attached to a human body, clothing, or the like. In that case, for example, it is configured as shown in FIG. FIG. 1 is a schematic sectional view showing an embodiment of the disposable body warmer of the present invention. In the disposable body warmer 1 shown in FIG. 1, the above-mentioned exothermic agent 10 is sandwiched between a gas permeable film 20 and a non-gas permeable film 30 (second film). Is sealed (for example, heat sealed).
A nonwoven fabric 21 is laminated on the outer surface of the breathable film 20 with an adhesive 22 interposed therebetween, and these constitute a first composite film 23. The other side is the second
The first composite film 2
A bag 50 is constituted by 3 and the second film 30.
Further, in the case where the second film 30 is stuck and fixed to a human body or clothing, the outer surface (the surface on the side not bonded) of the second film 30
The pressure-sensitive adhesive layer 60 is formed. Here, the second film 30 may further have a breathable film such as a nonwoven fabric laminated on the outer surface of the non-breathable film. In this case, the pressure-sensitive adhesive layer is formed on the breathable film.

The non-woven fabric 2 in the first composite film 23
The material of No. 1 is not particularly limited, and may be hydrophilic or hydrophobic, but a nonwoven fabric made of a synthetic fiber such as polyamide (nylon), polyolefin or polyester or a nonwoven fabric made of a natural fiber is preferably used, and a nylon nonwoven fabric is particularly preferred. Is used. Such a nonwoven fabric 21 has a thickness of 5
Those having a thickness of about 0 μm to 1 mm are preferably used.

As the gas permeable film 20 in the first composite film 23, a porous film made of a resin is preferably used, and the material is not particularly limited, but polyethylene, polypropylene, ethylene vinyl acetate copolymer, or the like is used. It is preferably used. Such a breathable film 2
As 0, those having a thickness of about 20 μm to 0.5 mm are suitably used.

Further, it is preferable that the breathable film 20 and the non-woven fabric 21 are bonded with an adhesive 22 in order to manufacture the disposable body warmer of the present invention. In particular, an adhesive or acryl containing an olefin resin and an inorganic filler is used. It is preferable that they are partially adhered by a system adhesive.

The thickness of the first composite film 23 is preferably from 70 μm to 1.5 mm, more preferably from 0.1 mm to 0.5 mm in terms of texture and feeling of use. It is particularly preferred that it is 2 mm to 0.4 mm.

On the other hand, the non-breathable film constituting the second film 30 may be any film which does not substantially transmit oxygen, and its material is not particularly limited. Polyolefin such as polyethylene, polypropylene, polybutadiene, and polychlorinated Vinyl, polyvinylidene chloride, polyester, polyether, polysulfone, polyamide and the like are preferably used. As such a non-breathable film, a film having a thickness of about 20 μm to 0.5 mm is suitably used.

The material of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, but may be acrylic, urethane, rubber, silicon, polyisoprene, polyisobutylene, styrene-isobutylene-styrene (SIS), or styrene. -Adhesives such as isoprene-based and polyacrylic acid-based water-soluble polymers are preferably used.

The disposable body warmer of the present invention is sealed with an outer bag made of a non-breathable film during storage. The film constituting such an outer bag is not particularly limited, but in order to realize a disposable body warmer that is more environmentally friendly, instead of commonly used polyvinylidene chloride (PVDC), oriented polypropylene (OPP), ethylene-vinyl acetate copolymer It is preferable to use a non-chlorine resin such as (EVA). Non-chlorine resin is an environment-friendly material that does not have to worry about generating dioxin during incineration. Further, the oxygen permeability of the outer bag is 2 ° C at 20 ° C and 50% RH.
When it is 7 cc / m ² · atm · day, it can be stored for a long period of time, and is particularly preferable.

[0031]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples.

Experimental Examples 1 to 4 and Comparative Examples 1 to 3
mm × 130 mm) was produced as follows.

That is, Examples 1 to 3 and Comparative Examples 1 to
In No. 3, a non-woven fabric made of hydrophobic nylon (2 μm) was applied to a porous polyethylene film (100 μm thick) having air permeability.
(Thickness: 00 μm) via an adhesive (acrylic adhesive), and a non-breathable polyethylene film (100 μm thickness) as a second film, with the nonwoven fabric on the outside. The three sides of the edge were heat-sealed with a width of 5 mm to obtain a sheet-like bag.
Further, in Example 4, a sheet-like bag was similarly obtained using a breathable sheet (trade name: Tyvek (manufactured by DuPont)) formed by laminating polyethylene fibers having air permeability and heating and pressing. .

The exothermic agent (25) having the composition shown in Table 1 was placed inside the plurality of sheet bags thus obtained.
g), and the other side was heat-sealed. Next, in Examples 1 to 3 and Comparative Examples 1 to 3, a hydrophobic SIS-based adhesive (JM6043 manufactured by Nippon Fuller) was spread over the entire outer surface of the second film to a thickness of 80 μm.
m of the pressure-sensitive adhesive layer was formed, and the pressure-sensitive adhesive layer was covered with a peeled film to obtain a disposable body warmer. The disposable warmers of Examples 1 to 4 and Comparative Examples 1 to 3 were respectively sealed in non-breathable outer bags and stored until used in the following tests.

In order to evaluate the heat generation performance of each of the disposable body warmers shown in Table 1 manufactured as described above, JI was used.
The maximum exothermic temperature and exothermic duration were measured according to the measuring method specified in S4100-1992. Table 1 shows the obtained results.

[0036]

[Table 1]

As is clear from the results shown in Table 1, in the disposable body warmer of the present invention (Examples 1 to 4), the maximum exothermic temperature is maintained in the temperature range of 40 ° C. to 60 ° C. The heat generation duration was 10 hours or more.

Next, the used exothermic agents (after the evaluation of the exothermicity) of Examples 1 to 4 and Comparative Examples 1 to 3 were pulverized, and subjected to a cultivation test on radish as fertilizer. In the cultivation test, about 300 cc of soil was put into a No. 4 pot-sized polypot having a drain port at the bottom, and 10 g of a used exothermic agent was blended so as to be dispersed in the soil on the surface, and about 300 cc of soil was again placed thereon. I put it on. Eight seeds of radish were scattered on the surface of the soil, covered with soil, and sufficiently watered. Then, every two days, 200 cc of water was irrigated, and the growth status was observed. Table 2 shows the results.

[0039]

[Table 2]

As is clear from the results shown in Table 2, the growth conditions using the exothermic agents of Examples 1 to 4 as fertilizers were higher than those of Comparative Examples 1 and 2 using the exothermic agents containing sodium chloride as fertilizers. It was good.

As described above, according to the disposable body warmer of the present invention, an excellent heat effect can be achieved, and the exothermic agent after use can be used as a fertilizer.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a disposable body warmer of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disposable body warmer, 10 ... Heat generation agent, 20 ... Breathable film, 21 ... Nonwoven fabric, 22 ... Adhesive, 23 ... 1st composite film, 30 ... 2nd film (non-breathable film), 40 ... Seal part , 50 ... bag, 60 ... adhesive layer.

Claims (3)

[Claims] 1. A disposable body warmer, wherein the exothermic agent comprises at least iron powder, calcium salt, and water, and the calcium salt is one of calcium chloride and calcium sulfate, or one of calcium chloride, calcium sulfate and calcium citrate. A disposable body warmer comprising a mixture containing two or more kinds. 2. The disposable body warmer according to claim 1, wherein the calcium salt is a mixture of calcium chloride, calcium sulfate, and calcium citrate, and the mixture weight ratio is 10: 5: 3. 3. A bag comprising a first composite film including a film having air permeability and a nonwoven fabric and a second film including a non-air permeable film, and an adhesive layer provided on an outer surface of the second film. The disposable body warmer according to claim 1, further comprising a heating agent contained in the bag.