JP2003000633A - Disposable body warmer and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable body warmer containing pyrogenic substances that always keep uniformity of the contents in use, has an excellent temperature performance and manufacturability, even when unwoven materials of sealant type without using porous films are used, and an efficient manufacturing method thereof. SOLUTION: The disposable body warmer comprises iron powder, active carbon, salts, a water absorption resin, a water retainer, water, a hydrogen generation inhibitor containing one species selected from alkaline metal salts and alkaline-earth metal salts of 0.5-5 w/% of the entire weight as and α-starch of 3-15 w/% of the entire weight as an excipient, and the manufacturing method thereof is provided.

Description

Detailed Description of the Invention

[0001]

The present invention relates to iron powder, activated carbon, salts,
The present invention relates to a disposable body warmer containing a water absorbent resin, a water retention agent and water, and further containing a hydrogen generation inhibitor and an excipient, and a method for producing the same.

[0002]

2. Description of the Related Art An exothermic composition containing iron powder, activated carbon, salts, a water absorbent resin, a water retention agent and water does not require ignition and simply produces heat by contact with air. Disposable body warmers enclosed in flexible storage bags have become widespread. Then, as a method of imparting air permeability to the storage bag, a method of forming a needle hole in a storage bag material in which a sealant such as polyethylene is laminated on a non-woven fabric or using a porous film as a material of the storage bag is adopted. There is.
The former method has a relatively large amount of ventilation and stable ventilation, but when the above exothermic composition is enclosed and used in this method, the contents shift to one side during use of the disposable body warmer, There was often a sense of discomfort in wearing the product. On the other hand, the latter method has the property that when the oxygen in the bag is consumed due to the exothermic reaction, the pressure inside the bag is reduced and the contents do not shift during use of the disposable body warmer. In addition to being high, there is a problem that it is extremely difficult to control the air permeability by means of the fine holes.

Therefore, as a measure for using a non-woven fabric sealant material provided with ventilation holes and preventing the contents from being biased during use, for example, Japanese Patent Publication No. 7-112477 discloses a metal powder such as iron powder. , A reaction aid such as a metal halide or a metal sulfate, water, and a water retention agent such as activated carbon, vermiculite, hirucite, silica gel, wood powder, and a water-absorbing polymer as main components, and generate heat in the presence of air. In addition to the above, an exothermic composition comprising a thickening agent is disclosed. However, this publication only lists a wide range of thickeners and does not mention any relation with other raw materials that affect the action of the thickeners, such as hydrogen generation inhibitors and water-absorbent resins. It has not been possible to provide a disposable body warmer having excellent temperature performance, manufacturability, and an effect of preventing the contents from being biased during use.

[0004]

The present invention, even when applied to a non-woven fabric sealant type material without using a porous film, causes not only temperature performance and manufacturability but also deviation of the contents during use. The object of the present invention is to provide a disposable body warmer in which an exothermic composition is enclosed, and an efficient manufacturing method thereof.

[0005]

Means for Solving the Problems and Embodiments of the Invention In order to solve the above problems, the present inventors have conducted extensive studies and as a result, in the exothermic composition, α-starch as an excipient and hydrogen. The present invention has been completed by studying various combinations with generation inhibitors and water-absorbent resins, and finding out the intended disposable body warmer and its manufacturing method.

That is, the invention of claim 1 contains iron powder, activated carbon, salts, a water-absorbent resin, a water retention agent and water, and at least one selected from alkali metal salts and alkaline earth metal salts as a hydrogen generation inhibitor. 0.5 for the total amount
The present invention relates to a disposable body warmer in which a heat-generating composition containing 5 to 5% by weight and 3 to 15% by weight of α-starch as an excipient with respect to the total amount is enclosed in a storage bag.

The iron powder constituting the exothermic composition is a main component involved in the oxidative exothermic reaction, and includes reduced iron, cast iron and the like, and powdery ones are generally used, but granular and fibrous ones are used. You may mix. Further, activated carbon and salts are necessary as an oxidation reaction accelerator for iron powder, and examples of the salts include sodium chloride, potassium chloride, magnesium chloride and the like.

The water-absorbent resin has a high water-retaining ability and can keep the whole in a free-flowing state. For example, polyacrylate cross-linked product, polyvinyl alcohol-acrylate copolymer, starch-acrylate graft copolymer. Examples thereof include a polymer, an acrylic acid salt-acrylic acid ester copolymer, an acrylic acid salt-acrylamide copolymer, an isobutylene-maleic anhydride copolymer, and a hydrolyzate of a crosslinked polyacrylonitrile. Among these, a polyacrylate crosslinked product is particularly preferable from the viewpoint of a combination with an α-starch as an excipient to be described later, and it is suitable to be blended in an amount of about 1.0 to 5% by weight based on the total amount. . Examples of the water retention agent include base materials such as wood powder, perlite and vermiculite, which are usually used together with a water absorbent resin.

In the exothermic composition used in the present invention, in addition to the above-mentioned components, a hydrogen generation inhibitor is contained in an amount of 0.5 to 5 with respect to the total amount.
It is blended by weight%. The hydrogen generation inhibitor has a liquid pH of 1
In addition to keeping the alkalinity of 1 or more to suppress the generation of hydrogen,
It has the effect of stably sustaining the shaping effect of α-starch. At least one selected from alkali metal salts and alkaline earth metal salts is used, and representative examples thereof include sodium metasilicate, sodium carbonate, sodium hydroxide, potassium hydroxide, magnesium hydroxide, sodium phosphate and the like. Above all, sodium metasilicate has a remarkable combination effect with α-starch, and since it has a large amount of water of crystallization, it is useful for stabilizing and maintaining temperature performance, and is particularly preferable.

The present invention further comprises, as a component constituting the exothermic composition, an excipient α-starch in an amount of 3 to 1 based on the total amount.
It is characterized in that it is compounded at 5% by weight. The excipient α-starch suppresses the movement of the contents in the storage bag during the use of the disposable body warmer and prevents the occurrence of offset, which makes the disposable body warmer thin and flexible. This has the effect of enhancing the wearability of clothes. This effect can also be obtained by using a storage bag made of a porous film material, but this porous film has the drawbacks of high cost and difficulty in controlling the air permeability and stable temperature performance. Therefore, the practical advantage of the present invention applicable to a storage bag made of a nonwoven fabric sealant type material is extremely large. If the blending amount of α-starch is less than 3% by weight, the anti-deviation effect cannot be obtained, while if it exceeds 15% by weight, the temperature performance is affected, which is not preferable. In applications other than the purpose of the present invention, other excipients such as sodium alginate, sodium caseinate, polyvinyl alcohol, etc. are well known, but as a result of the test, these have an effect of preventing uneven bias compared to α-starch. It was found to be low.

The storage bag for enclosing the heat-generating composition used in the present invention is preferably a non-woven fabric or a paper material in which a film such as polyethylene or polypropylene as a sealant is laminated on a bag material and needle holes are opened to provide air permeability. ing.
This type is cheaper than the porous film and has relatively uniform air permeability, so that a disposable body warmer with stable temperature performance can be obtained. Further, in the case of the conventional exothermic composition, it is necessary to make the needle hole small so that the content does not leak out, but in this exothermic composition, the content leaks due to the effect of α-starch as an excipient. There is no fear, and the size of the needle hole can be set relatively arbitrarily.

According to the invention of claim 2, in the structure of claim 1, sodium metasilicate salt is used as the alkali metal salt.

According to a third aspect of the present invention, in the construction of the first or second aspect, a crosslinked polyacrylate is used as the water absorbent resin.

The present invention also provides an efficient method for producing a disposable body warmer containing such a useful exothermic composition in a storage bag. That is, the invention of claim 4 provides the following raw materials constituting the exothermic composition, (A) iron powder (B) excipient (C) activated carbon, water absorbent resin, water retention agent, hydrogen generation inhibitor (D) salts , Out of water, a mixture of (A) and (B) or a mixture of (A) and (B) with any raw material selected from (C),
The present invention relates to a method for producing a disposable body warmer in which a mixture of the remaining raw material (C) and (D) is added and mixed, and then immediately filled in a storage bag. In the disposable body warmer of the present invention, (B) is (D)
It is necessary to avoid the mixing step of (B) and (D), because if they come into contact with the water content, a nodule will be formed and it will be difficult to fill the storage bag.

According to a fifth aspect of the present invention, in the production of the disposable body warmer, the mixture of (A) and (B) is mixed with the mixture of (C) and (D), and then immediately filled in a storage bag. It is the one.

The invention of claim 6 is the method according to claim 4 or 5, wherein sodium metasilicate is used as the alkali metal salt.

According to a seventh aspect of the present invention, in the production method according to any of the fourth to sixth aspects, a crosslinked polyacrylate is used as the water absorbent resin.

The filling amount of the exothermic composition in the storage bag can be appropriately set depending on the purpose of use and application. For example, in the case of body wearing, about 30 to 50 g is suitable.
The disposable body warmer thus obtained is usually stored in a non-breathable bag and used by breaking the bag at the time of use. However, the disposable body warmer of the present invention has excellent temperature performance, You can get comfortable warmth without any bias. Needless to say, auxiliary means for attaching the disposable body warmer to the body or clothing, such as an adhesive tape, may be appropriately loaded.

[0019]

EXAMPLES The disposable warmer and the method for producing the same according to the present invention will be described in more detail based on the following specific examples and test examples, but the present invention is not limited thereto.

Example 1. 20 g of iron powder and 3 g of α-starch
Was mixed well, while activated carbon 2.5 g, sodium chloride 0.8 g, water-absorbent resin (crosslinked sodium polyacrylate) 1.0 g, wood flour 1.0 g, sodium metasilicate salt 0.5 g, and water 11 g. Was prepared. Put both mixtures into one container, while mixing both components through obstacles such as screws, a storage bag made of perforated non-woven polyethylene material (size: 9 x 14 cm)
To obtain a disposable body warmer of the present invention. This disposable body warmer has excellent temperature performance, and due to the action of α-starch as an excipient, it maintained a thin flat plate shape during use and fits comfortably to the body. In addition, when all the raw materials of the exothermic composition were put into a Nauta mixer and an attempt was made to mix them, it was impossible to fill them due to agglomeration.

Test Example 1. Various exothermic compositions were prepared according to the formulation shown in Table 1 according to Example 1 and filled in a storage bag in which a nonwoven fabric-polyethylene material was perforated. The productivity of the exothermic composition due to stickiness, etc., temperature performance (maximum temperature, duration of heat generation, etc.), and usability (deviation of contents during use, etc.) are shown in Table 1. The evaluation was based on the following criteria. (1) Manufacturability: ◯; Manufacturability is good in the free-flowing state Δ: Intermediate between ◯ and ×: Extremely sticky and difficult to manufacture (2) Temperature performance: ◯: Maximum temperature is 55 to 65 ° C and 40 ° C or more Fever lasts for 10 hours or more △; intermediate between ○ and × ×; maximum temperature is 50 ° C or lower, or heat generation duration is 40 ° C or higher for 8 hours or less (3) Usability: ○; piece of contents in use Fits on the body with no leaning △: Intermediate between ○ and × ×: The contents are biased to one side, causing discomfort when worn

[0022]

[Table 1]

As a result of the test, an exothermic composition containing 0.5 to 5% by weight of a hydrogen generation inhibitor and 3 to 15% by weight of α-starch as an excipient was enclosed. The disposable body warmer of the present invention has excellent manufacturability, temperature performance, and usability. In contrast, α-starch is 3%
In the following (Comparative Example 1), the usability was not improved, while when α-starch exceeded 15% (Comparative Example 2), a decrease in manufacturability and temperature performance was observed. In addition, there is a mutual relationship between the hydrogen generation inhibitor and the amount of α-starch compounded. For example, as in Comparative Example 3 and Comparative Example 4, when the hydrogen generation inhibitor is used in combination outside the specific range, the performance fails. It was Furthermore, the use of excipients other than α-starch (Comparative Examples 5 and 6) did not give favorable results.

[0024]

The present invention does not use a porous film,
Disclosed is a disposable body warmer in which a heat-generating composition that does not cause a bias of the contents during use is enclosed, as well as temperature performance and manufacturability even when applied to a non-woven sealant-type material, and an efficient manufacturing method thereof.

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Claims (7)

[Claims] 1. An iron powder, activated carbon, salts, a water absorbent resin, a water retention agent and water, and at least one selected from an alkali metal salt and an alkaline earth metal salt as a hydrogen generation inhibitor, based on the total amount. A disposable body warmer, which is obtained by enclosing a heating composition containing 0.5 to 5% by weight and 3 to 15% by weight of α-starch as an excipient in a storage bag. 2. The disposable body warmer according to claim 1, wherein the alkali metal salt is sodium metasilicate. 3. The disposable body warmer according to claim 1, wherein the water absorbent resin is a crosslinked polyacrylate. 4. An iron powder, activated carbon, salts, a water absorbent resin, a water retention agent and water, and at least one selected from an alkali metal salt and an alkaline earth metal salt as a hydrogen generation inhibitor based on the total amount. In the production of a disposable body warmer in which a heat-generating composition containing 0.5 to 5% by weight and 3 to 15% by weight of α-starch as an excipient with respect to the total amount is enclosed in a storage bag, (A) iron powder (B) Excipient (C) Activated carbon, water-absorbent resin, water-retaining agent, hydrogen generation inhibitor (D) salts, water (A) and (B) or (A) and (B) ) To a mixture of any of the ingredients selected from
A method for producing a disposable body warmer, which comprises immediately adding and mixing a mixture of the remaining raw material (C) and (D), and immediately filling the storage bag. 5. In the production of the disposable body warmer,
The method for producing a disposable body warmer according to claim 4, wherein the mixture comprising (C) and (D) is added to and mixed with the mixture of (A) and (B) and then immediately filled in a storage bag. 6. The method for producing a disposable body warmer according to claim 4 or 5, wherein the alkali metal salt is sodium metasilicate. 7. The method for producing a disposable body warmer according to claim 4, wherein the water absorbent resin is a crosslinked polyacrylate.