JPS6340458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a body surface cooling patch.

Traditionally, it has been used to prevent fever or a rise in body temperature due to a rise in ambient temperature, or simply to provide a cooling sensation.
For example, it is widely practiced to bring an object whose temperature is lower than that of the body surface into contact with a part of the body surface, such as the forehead.
Objects that have a temperature below the body surface temperature that have been used for a long time include cloths, such as towels soaked in cold water, water pillows, and ice packs. Recently, a bag filled with a substance having a relatively large heat capacity, sealed and cooled in a refrigerator or the like before being taken out and used is also commercially available. Although currently used objects with temperatures below the body surface temperature have become relatively easy to obtain as freezers and refrigerators have become widespread, they still have the following drawbacks.

In other words, all currently used objects with temperatures below the body surface temperature described above use the negative heat source required for cooling the body surface as the heat of fusion associated with the melting of ice, etc. contained in the object, or simply as a source of negative heat for cooling the body surface. It is obtained in a form that depends on the heat capacity of the Therefore, if the temperature of the object reaches the body surface temperature and its cooling effect disappears when the object is used, it is necessary to cool the object again by placing it in, for example, a freezer or a refrigerator.
In order to maintain the cooling effect on the body surface for a practical period of time, for example, at least 30 minutes to 1 hour using such an object, the weight and volume of the object will inevitably be large. When a person moves or exercises while in contact with the body surface, it becomes necessary to hold it in place by hand or firmly secure it with a string or band, which may cause discomfort, contrary to the effect of cooling the body surface. It will bring about. Furthermore, in order to use such objects continuously for a long time in places such as freezers and refrigerators where negative heat sources cannot be obtained, it is necessary to prepare a large number of such objects and transport them while keeping them cool, which requires a lot of effort. It takes effort. As described above, the objects currently used at temperatures below the body surface temperature described above have extremely poor portability. In addition, especially if the object has a temperature below the body surface temperature and is simply a towel or the like soaked in cold water, the negative heat source required for cooling depends on the heat capacity of the water, so it should not come into contact with the body surface. The temperature of the object immediately begins to rise from the moment the object cools down, and the period of time during which a cooling sensation is actually obtained is short, and it takes a lot of effort to frequently add cold water or the like to a towel or the like.

Recently, there have also been commercially available devices in which the negative heat source required for cooling is dependent on the dissolution of crystals that are endothermic when dissolved in a solvent to obtain an object whose temperature is below the body surface temperature. ing. Specifically, a solvent and a crystal that absorbs heat when dissolved in the solvent are each independently filled in a container, for example, a bag, and immediately before use, the solvent and the crystal are placed in the container. The melting of the crystals progresses by coalescence and mixing inside the body, and the heat absorption during this process produces an object whose temperature is below the body surface temperature. Objects whose temperature is below the body surface temperature that can be used based on this principle do not need to be kept cold during storage or transportation until they are used, but in order to maintain the cooling effect on the body surface for a practical period of time. The reality is that the weight and volume of the object must be large, and furthermore, once the crystals have completely melted and the body surface temperature has reached the body surface temperature, the body surface temperature will rise again according to the same principle. It is not possible to lower the temperature below that and is discarded, which poses a problem from the perspective of resource conservation and environmental conservation.

The present inventors have completed the present invention as a result of intensive research aimed at overcoming the various deficiencies described above in objects with temperatures below the body surface temperature that are currently used for the purpose of cooling the body surface. . That is, the present invention has a thickness of 0.05 to 1 mm and a thermal conductivity of 0.1 cal/
It has an absorbent material layer (B) impregnated with a volatile liquid on one side of a metal material (A) whose temperature is at least cm・sec・℃ and has an adhesive layer (C) on the other side. The present invention provides a body surface cooling patch.

The body surface cooling patch of the present invention has the following differences compared to currently used objects whose temperature is below the body surface and whose purpose is to cool the body surface. First, the body surface cooling patch obtained by carrying out the present invention is used by being applied to the body surface via the adhesive layer (C), and the negative heat source necessary for cooling is made volatile. Because it uses the heat of vaporization of the liquid, it can be made extremely lightweight and small in volume, and its cooling effect can be maximized without causing any discomfort when moving or exercising. . During use, a constant temperature below the body surface temperature can be maintained as long as the volatile liquid does not run out. Furthermore, the body surface cooling patch of the present invention does not need to be kept cold during storage, transportation, or portability before use. Only volatile liquids need to be impregnated with the absorbent material layer (B) or placed in a separate container and sealed to prevent evaporation. Furthermore, when using the body surface cooling patch of the present invention for a long time, if the volatile liquid runs out and the cooling effect disappears, the same cooling effect can be continued by simply impregnating it with the volatile liquid. .

The metal material (A) used in the present invention has a thickness of 0.05 to 1 mm and a thermal conductivity of 0.1 cal/cm・sec・℃
Any of the above pure metals or alloys may be used, but it is preferable to use metals with a thermal conductivity of 0.5 cal/cm·sec·°C or higher, such as aluminum, copper, silver, and gold. Among such metals, aluminum can be most preferably used because it has a low specific gravity, is inexpensive, and is easily plastically worked. Metal material (A)
functions to efficiently transmit the negative heat source obtained when the volatile liquid impregnated into the absorbent material layer (B) evaporates to the body surface. The shape of the metal material (A) is such that on the surface to which the absorbent material layer (B) is fixed, the area where the volatile liquid impregnated in the absorbent material layer (B) can evaporate is as large as possible. That is, it is preferable that the shape has a large number of protrusion-like or fin-like parts, for example. Such a form is
It can be obtained by simply deforming the metal material (A), or by joining a protrusion or fin-like object made of the same material as the metal material (A) to one side of the metal material (A). On the other hand, the surface on which the adhesive layer (C) is provided is in a form that allows it to adhere as closely to the body surface as possible in order to efficiently transfer the negative heat source obtained on the surface of the absorbent material layer (B) to the body surface. It is preferable. For this purpose, it is desirable that the metal material (A) be able to change its shape to fit the body surface at any time, that is, have sufficient flexibility or plasticity. The thickness of the metal material (A) is 0.05 to 1 mm, preferably 0.1 to 0.3 mm. If it is thinner than 0.05 mm, it may become difficult to maintain the shape of the patch of the present invention, or the heat conduction efficiency of the protrusion-like or fin-like portions will decrease.
If the weight exceeds 100, it becomes difficult to adapt to body surfaces of unspecified shapes, and the weight increases, resulting in inconveniences.

The shape and area of the surface where the metal material (A) adheres to the body surface via the adhesive layer (C) can be arbitrarily selected depending on the part of the body surface to be used. For example, when used on the forehead, A rectangular shape of about 4 cm x 10 cm can be effectively used. Further, if necessary, a suitable number of square pieces of about 2 cm x 2 cm or circular pieces of about 2 cm in diameter can be used by arranging them on the surface.

This metal material (A) can be in the shape of a plate, wire mesh, or the like. In the case of a plate shape, holes may be made as appropriate to improve flexibility.

The absorbent material layer (B) used in the present invention may be any material as long as it can be impregnated with a volatile liquid, but it is necessary that it is not dissolved by the volatile liquid. Examples of materials used for the absorbent material layer (B) include paper, cloth, cotton, felt, pulp powder, sawdust, wood flour, wood wool, asbestos, perlite,
Examples include absorbent natural resins, synthetic or semi-synthetic resins, open metal foams, porous ceramics, flocked fiber aggregates, and the like. Of course, these materials can also be used in appropriate combination.

Various methods can be used to fix the absorbent material layer (B) to the metal material (A). Among these, it is most convenient to use a conventionally known pressure-sensitive adhesive or adhesive, but such pressure-sensitive adhesive or adhesive does not dissolve or swell with the volatile liquid used in the present invention and lose its fixing function. It is necessary. Examples of such adhesives include acrylic resin adhesives and rubber adhesives, and double-sided adhesive tapes using these adhesives can also be effectively used. Examples of adhesives include epoxy resin adhesives.

As the adhesive forming the adhesive layer (C), the adhesive layer
Since (C) comes into contact with the surface of the human body, it must not cause any damage to the skin. Specific examples of such adhesives include natural rubber, polyisobutylene, acrylic ester polymers obtained by polymerizing unsaturated monomers mainly composed of acrylic acid 2-ethylhexyl ester, acrylic acid butyl ester, etc. There are mergers, etc. In addition, if necessary, tackifiers such as hydrogenated rosin to increase the adhesiveness, softeners such as lanolin and polybutene to increase the adhesiveness especially on the skin surface, and oxidation to obtain a filling reinforcement effect. Zinc etc. can also be blended. Furthermore, in order to further enhance the usability effect of the body surface cooling patch obtained by the present invention, substances that stimulate a cooling sensation, such as menthol, camphor, and methyl salicylate, may be added to the adhesive constituting the adhesive layer (C). It is also possible to mix the following. In addition, an antioxidant or a coloring agent for the pressure-sensitive adhesive may be added as necessary.

The adhesive layer (C) fixes the body surface cooling patch of the present invention to the human body surface, and also adheres closely to the human body surface to effectively exert a cooling effect. However, when applying the body surface cooling patch of the present invention to the arms, legs, forehead, etc., or when moving the body while using the patch, strings, rubber cords, etc. may be used as an auxiliary aid. The patch can also be fixed to the surface of the human body.

The volatile liquid to be impregnated into the absorbent material layer (B) is one in which the liquid and its vapor do not have toxicity, irritation, or unpleasant odor to the human body;
In addition, it must not be highly flammable and must not dissolve the absorbent material (B). Examples of such volatile liquids include ethanol, water, 1,2-propanediol, etc.
A mixture of more than one species can be effectively used. Among these, water can be used most preferably because it is easily available and inexpensive. Furthermore, by appropriately mixing and using two or more of these volatile liquids, the cooling effect can be effectively adjusted. That is, if it is desired to obtain a large cooling effect immediately after the use of the body surface cooling patch according to the present invention, a water/ethanol mixed solution containing, for example, 5 to 50% by weight of ethanol may be used. Further, if it is desired to maintain the cooling effect for a longer period of time, a mixed solution of water/1,2-propanediol containing 5 to 30% by weight of 1,2-propanediol can be used, for example.

The body surface cooling patch obtained by carrying out the present invention has an adhesive layer (C) on the surface of the adhesive layer (C) in order to facilitate handling during storage, transportation, or portability before use. It is also possible to apply a sheet to temporarily protect the surface, for example, what is generally called a release paper, and remove the sheet immediately before use.

As is clear from the above, the body surface cooling patch of the present invention is extremely lightweight and lightweight compared to objects conventionally used to cool the body surface.
Because it can be made into a small volume and does not require any cold storage before use,
It is extremely convenient for storage, transportation, and portability before use. Furthermore, even during use, a sufficient cooling effect can be obtained without causing any inconvenience when the user moves or exercises, and the same cooling effect can be obtained indefinitely by replenishing volatile liquid as necessary. It is temporary.

The effects of the body surface cooling patch of the present invention are as follows:
Unlike the heat of fusion, heat capacity, or heat of solution, which objects used to cool the body surface rely on as a negative heat source, the negative heat source required for cooling is far greater with the same weight or volume. It is obtained by determining the heat of vaporization of a volatile liquid, which provides a large negative heat source.

Next, the content of the present invention will be explained in more detail with reference to Examples described below, but the content of the present invention is not limited by these Examples.
Note that all parts in the examples mean parts by weight.

Example 1 Two sheets of gauze of the same size were stacked on one side of an aluminum sheet with a thickness of 0.1 mm, a width of 4 cm, and a length of 31 cm, and were fixed using double-sided adhesive tape to form the shape shown in Figure 1. It was molded (protrusion interval approximately 1 cm, protrusion height approximately 1 cm). 70 parts of 2-ethylhexyl acrylate, 29 parts of vinyl acetate, and 1 part of 2-hydroxyethyl methacrylate were copolymerized on the aluminum surface of the resulting molded product. The resulting adhesive was spread to a thickness of about 25 μm. Next, the gauze layer was impregnated with about 5 g of a mixed water/ethanol solution consisting of 90 parts of water and 10 parts of ethanol, and was brought into close contact with the forehead of the panelist through the adhesive layer. Immediately after it was brought into close contact with the forehead, a sufficient cooling sensation was obtained, and the same cooling sensation continued for approximately 1 hour thereafter. During this period, the body surface was sufficiently cooled without causing any discomfort even when standing still, walking, or exercising vigorously, and the body surface did not naturally peel off from the forehead.

Example 2 On one side of the same aluminum sheet used in Example 1, an open polyurethane resin foam of the same size and thickness of 1 mm (bubble diameter of approximately 0.2 mm) was fixed using double-sided adhesive tape. This was molded into the shape shown in Figure 1 (protrusion spacing approximately 1 cm, protrusion height approximately 1 cm).
Natural rubber on the aluminum surface of the resulting molding
100 parts, polyisobutylene 20 parts, polybutene 20 parts,
100 parts hydrogenated rosin, 10 parts lanolin, 100 parts zinc oxide
1 part and 1.5 parts of an antioxidant were mixed and kneaded, and the resulting adhesive was spread to a thickness of about 30 μm. The open foam layer of polyurethane resin is then coated with 80% water.
About 10 g of a mixed solution of water/ethanol/1,2-propanediol consisting of 10 parts of ethanol, and 10 parts of 1,2-propanediol was impregnated with the panelist's forehead through the adhesive layer. Immediately after it was brought into close contact with the forehead, a sufficient cooling sensation was obtained, and the same cooling sensation was maintained for approximately 2 hours thereafter. During this period, the body surface was sufficiently cooled without causing any discomfort even when standing still, walking, or exercising vigorously, and the body surface did not naturally peel off from the forehead.

[Brief explanation of the drawing]

FIGS. 1, 3, 4, and 5 are explanatory diagrams showing aspects of the body surface cooling patch of the present invention, and FIG. It is a partially enlarged sectional view of the line. 1... Metal material, 2... Absorbent material layer, 3... Adhesive layer.

Claims (1)

[Claims] 1 The thickness is 0.05 to 1 mm and the thermal conductivity is 0.1 cal/
It has an absorbent material layer (B) impregnated with a volatile liquid on one side of a metal material (A) whose temperature is at least cm・sec・℃ and has an adhesive layer (C) on the other side. Body surface cooling patch.