JP2007136076A - Warming object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a warming object which is easy to stick and which gives no incongruity to be used at comfortable temperature when sticking. <P>SOLUTION: A sodium acetate aqueous solution and a trigger are enclosed in a bag. The thickness D of the bag is 0.5-1 cm, a contact area S of the bag and the skin is 5-70 cm<SP>2</SP>, the concentration C of sodium acetate in the sodium acetate aqueous solution is 0.48-0.6 g/g, and formula (1), 0.15≤S<SP>1/2</SP>×D×C<SP>5</SP>≤0.25, is satisfied. The warming object is stuck to a human body and used while a part or the whole of the body is soaked in warm water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heating element.

In order to increase the temperature of the skin and promote blood circulation, a number of portable body warmers are known, but these only increase the skin temperature of the contacted part. Requires a portable hand warmer.
A partial bath or a whole body bath (hereinafter referred to as “bathing”) is effective in increasing blood circulation over a wide range or throughout the body, but it is difficult to raise the bath temperature to a high temperature like a warmer in order to further enhance the effect.
As a method for overcoming these problems, the use of a composition for local heating in a bathroom has been studied. For example, a composition for local heating containing a heat-generating substance that generates heat by a hydration reaction is known (Patent Literature). 1). This is an exothermic composition that is used by immersing a sheet in water or supplying water. For example, it is a thermal composition in which a local heat treatment is performed in warm water during bathing and a thermal effect is obtained over a wide range. However, in order to generate heat, water is required, and it is necessary to always immerse the application site in bath water.
For example, when using a portable body warmer that utilizes the heat of oxidation of iron powder during bathing, the hand warmer will get wet even when used in bath water, as well as when used outside the bath water. Or there was a fear of being suppressed.

On the other hand, a heat pack using sodium acetate is known as a portable body warmer. This is because the supercooled state of sodium acetate hydrate is stable and can exist as a liquid even below the freezing point, and when stimulated in the supercooled state below the freezing point, crystallization (solidification) occurs and the temperature rises to the freezing point. It is used in a form in which sodium acetate hydrate and a trigger (detonation material) that promotes crystallization are enclosed in a bag (see Patent Document 2).
Japanese Patent Laid-Open No. 11-318967 Japanese Patent No. 1280575

  The above heat pack is not inconvenient when using heat of hydration or heat of oxidation and is considered applicable to bathing water and parts outside bathing water at the time of bathing. However, there are problems that the solidified crystals after solidification are hard and uncomfortable, difficult to be applied to a human body with many curved surfaces, and more difficult to apply because the freezing temperature is high and feels hot.

  It is an object of the present invention to provide a heating element that can be easily applied and can be used at a comfortable temperature without feeling uncomfortable.

  As a result of various studies on the usability of the heating element using sodium acetate hydrate during bathing, the present inventor made a heating element containing sodium acetate in a specific ratio and further defines the dimensions of the heating element. As a result, the inventors have found that the above problems can be solved, and have completed the present invention.

That is, the present invention comprises a bag in which an aqueous sodium acetate solution and a trigger are enclosed, the bag thickness D is 0.5 to 1 cm, the contact area S between the bag and the skin is 5 to 70 cm ² , The concentration C of sodium acetate in the aqueous sodium solution is 0.48 to 0.56 g / g, and the formula (1)
0.15 ≦ S ^1/2 × D × C ⁵ ≦ 0.25 (1)
The present invention provides a heating element that is used in a state in which a part or the whole of the body is immersed in warm water by being attached to a human body.

  ADVANTAGE OF THE INVENTION According to this invention, when it affixes directly on a human body during bathing, the heat generating body which is comfortable temperature and does not feel uncomfortable at the time of affixing can be provided.

The heating element of the present invention encloses an aqueous sodium acetate solution and a trigger in a bag of a specific size.
The material of the bag used in the present invention is not particularly limited. For example, plastic sheets such as polyethylene, polypropylene, polyolefin, polyester, ethylene acrylic acid copolymer (EAA), ethylene methacrylic acid copolymer (EMAA), and vinyl chloride. Alternatively, thermoplastic elastomers such as styrene, vinyl chloride, olefin, and urethane polyamide can be used. The material of the bag may be used alone or in combination of two or more, and the bag may be a single layer or multiple layers.

One surface that is not affixed to the skin can be covered with a heat insulating material to suppress heat diffusion.
Although the surface to be attached to the skin has an adhesive layer, in addition to the structure in which the adhesive is directly processed in the bag, a method of adhering to the bag using a double-sided tape may be used. Bactericides, anti-inflammatory agents, astringents, hemostatic agents, analgesics, vitamins and derivatives thereof, refreshing agents, cooling agents, warming agents, animal and plant extracts, fragrances, and the like can be added to the adhesive layer that adheres to the skin. .

  The thickness D (cm) of the heating element is required to be 0.5 to 1 cm from the viewpoint of thermal feeling and sticking feeling when used in combination with bathing, but is 0.5 to 0.9 cm. It is preferable that it is 0.5 to 0.8 cm. If the thickness is less than 0.5 cm, a sufficient calorific value cannot be obtained, and the thermal sensation does not last. On the other hand, if the thickness exceeds 1 cm, it cannot be sufficiently followed when applied to a human body having a large curved surface (for example, a shoulder), so that part of the skin is peeled off or the skin is pulled, resulting in poor usability. Here, the “thickness” refers to the thickness of the contents obtained by subtracting the thickness of the filling bag, the pressure-sensitive adhesive layer, the release paper, and the like from the thickness when the heating body is left on a horizontal plate made of a hard material.

The size of the bag of the heat body is the contact area between the bag and the skin S (cm ²⁾ is 70cm ² or less, preferably, 5～70Cm ^2, area 20～60Cm ^2, particularly preferably area 30 50 cm ² . If the area exceeds 70 cm ² , it cannot be sufficiently followed when applied to a human body having a large curved surface (for example, a shoulder), so that a part of it is peeled off or the skin is pulled, resulting in poor usability.

  The concentration C (g / g) of sodium acetate in the aqueous sodium acetate solution used in the present invention needs to be 0.48 to 0.56 from the viewpoint of thermal feeling, but preferably 0.5 to 0. .56, particularly preferably 0.51 to 0.54. When used in combination with bathing, the exothermic temperature is low when the concentration is lower than 0.48, which is insufficient when applied to the human body, and when the concentration is higher than 0.56, the exothermic temperature is high and uncomfortable. There is.

  As the sodium acetate to be used, either an anhydride or a hydrate can be used, but a hydrate is preferable, and a trihydrate is more preferable. In order to bring sodium acetate into a supercooled state, it is necessary to mix sodium acetate and water and then heat to dissolve the sodium acetate, or to fill the container with sodium acetate and water and heat to dissolve the sodium acetate. . Alternatively, acetic acid and sodium hydroxide anhydride or aqueous solution may be mixed and used. In this case, since heat is generated by the neutralization reaction, the temperature of the mixture rises due to this heat, so that sodium acetate is dissolved, and it can be handled in a liquid state without heating.

Further, from the viewpoint of a feeling of sticking, the bag thickness D (cm), the contact area S (cm ² ) between the bag and the skin, and the concentration C (g / g) of sodium acetate in the aqueous sodium acetate solution are expressed by the formula (1). )
0.15 ≦ S ^1/2 × D × C ⁵ ≦ 0.25 (1)
It is necessary to satisfy. More preferably, it is 0.18 or more and 0.23 or less. If the heating element does not satisfy the formula (1), the sustaining of the heating is not sufficient, or the solidified crystals after solidification are hard and the feeling of use becomes worse.

  The trigger for inducing the crystallization of sodium acetate is not particularly limited. For example, the metal piece has a curved structure and can be reversed (Japanese Patent Laid-Open No. 05-261127, Japanese Patent Laid-Open No. 2000-342619). A curved metal piece (Japanese Patent Laid-Open No. 01-164365, Japanese Patent Laid-Open No. 03-37180) that is restored by elasticity may be used, or a sachet filled with a crystallization agent instead of a metal trigger is filled with sodium acetate. A method in which the coagulation reaction is advanced by breaking the sachet containing the crystallizing agent (Japanese Patent Laid-Open No. 02-109558), or the bag is divided into two parts and sodium acetate hydrate is mainly used on one side. A method of starting the coagulation reaction by opening and mixing the part where the two bags were separated at the time of use, etc. It may be used.

  In addition to the aqueous sodium acetate solution and the trigger, for example, a dye, a viscosity modifier and the like can be appropriately blended with the heating element of the present invention.

The heating element of the present invention is suitably used for application to a human body in a state where a part or all of the body is immersed in warm water. By this method, a thermal effect can be obtained in a relatively wide range of the local area and its peripheral part. Here, “the state in which a part or all of the body is immersed in hot water” means, for example, a state in which at least a part of the body is immersed in hot water stretched on a bathtub, a bowl, a scallop, etc. Including half-body bathing, sitting bathing, hand bathing, foot bathing. For example, in the local thermal treatment of the forearm, it means that the entire forearm is immersed in warm water in the talai. The temperature of the hot water is generally a bathing temperature of 33 to 45 ° C, preferably 35 to 43 ° C.
Although there is no restriction | limiting in particular in the local body, For example, the affected part etc., such as a stiff shoulder and a low back pain, are mentioned. The hot body may be affixed to a part dipped in hot water, or may be affixed to a part not dipped in hot water.

  A double-sided metal disc (diameter 2 cm, made of stainless steel) filled with a mixture of sodium acetate and water dissolved in a 200 μm thick bag-shaped container of ethylene methacrylic acid copolymer and a trigger, and both sides with release paper on one side Adhesive tape was applied. Invert the metal disc that can be turned over to crystallize sodium acetate, start to generate heat, disperse lightly, peel off the release paper and paste it on the shoulder for 5 minutes, bathing at 40 ° C for 5 minutes (until the armpit The water feeling and the sticking feeling were evaluated. The results are shown in Table 1.

Sense of heat ○: Sustains appropriate heat.
(Triangle | delta): Temperature is too high and there is some discomfort.
X: Insufficient heat or thermal sensation does not last.
A feeling of sticking ○: There is no sense of incongruity at the time of sticking, and no peeling occurs.
X: The heating element becomes hard and feels uncomfortable or peels off.

  In Examples 1 to 3, both the thermal feeling and the sticking feeling were good. On the other hand, in the comparative example 1, since the thermal body became hard, the pasted site was uncomfortable. In Comparative Examples 2 and 3, the thermal sensation was sufficient, but the peripheral part was peeled off and the sticking feeling was not good. In Comparative Example 4, the feeling of pasting was good and the thermal feeling just after pasting was also good, but there was no persistence of the warm feeling and the feeling of warmth immediately disappeared.

Claims (3)

Sodium acetate aqueous solution and trigger are enclosed in the bag, the bag thickness D is 0.5-1 cm, the contact area S between the bag and the skin is 5-70 cm ² , sodium acetate in the sodium acetate aqueous solution Concentration C is 0.48 to 0.56 g / g, and the formula (1)
0.15 ≦ S ^1/2 × D × C ⁵ ≦ 0.25 (1)
A thermal body that is used by being attached to the human body.   The heating element according to claim 1, wherein the heating element is used in a state where a part or all of the body is immersed in warm water. Heat body according to claim 1 or 2, wherein the contact area S between the bag and the skin is 20～70Cm ^2.