JPH03100090A - Structure of sweat-absorptive material for thermotherapy - Google Patents

Abstract

PURPOSE:To obtain the title structure which can prolong the time during which a required temperature is maintained so as to make thermotherapy more effective and which can keep the skin clean by forming a constitution wherein a heat generating material composition is enclosed in a flat bag the front of which is made of an air- transmissible film and the rear of which is made of a specified supporting base material, and a pressure-sensitive adhesive layer is provided on the exposed surface of the supporting base material. CONSTITUTION:A structure 1 of material for thermotherapy formed by enclosing a heat generating material composition 3, which generates heat in the presence of air, in a closed flat bag 2 are front of which is made of an air-transmissible film 5 (e.g. consisting of an air-transmissible base film 5a and an air-transmissible reinforcing film 5b) and the rear of which is made of a supporting base material 6; and providing a pressure-sensitive adhesive layer 4 partially on the rear of the flat bag 2. The base material 6 comprises a laminated film prepared by putting a water-absorptive layer 6b between a synthetic resin film 6a and a porous synthetic resin film 6c having a maximum pore diameter of 30mum or below. The pressure-sensitive adhesion layer 4 is formed partially on the exposed surface of the porous film 6c.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applied to the skin so that the heat of the heating element composition is transmitted evenly and over the entire surface of the skin, and also improves local blood circulation due to the heat generation. The present invention relates to a sweat-absorbing heating body structure that improves local metabolism and improves adhesion to the skin by absorbing sweat and waste products from the skin surface.

(b) Conventional technology heat therapy can treat symptoms associated with pain and coldness, such as stiff shoulders,
It is used as a treatment for muscle pain, muscle stiffness, cold hands and feet, neuralgia, rheumatism, lower back pain, etc., but conventional heat therapy involves applying a towel warmed with boiling water, konnyaku (konnyaku) or a hot pack to the affected area, Warm up your body with a paraffin bath,
Methods used include applying a warm compress containing irritating ingredients such as chili pepper extract, or applying a disposable body warmer directly to the affected area.

However, treatment methods that use warmed towels, konjac, or hot packs can cause burns at high temperatures, or the hot compress effect cannot be obtained at low temperatures, and the predetermined temperature at which the hot compress effect can be obtained is extremely difficult to maintain. It is difficult to use, so it can only provide a warm compress for a short time, and it is necessary to temporarily suspend daily activities during treatment.There are various restrictions on its use, and it is not convenient. Met.

Furthermore, in treatments using warmed towels or konnyaku, the heating source does not have self-heating properties, and the compresses may lose heat of vaporization and cool down over time, resulting in an adverse effect.

In particular, heating towels, konjac, and hot packs with boiling water or using a heater is complicated, and
At the beginning of use, the device is so hot that several towels or the like must be used, and the temperature drops in a short period of time.

Paraffin baths have restrictions on where they can be used, and are limited to areas such as hands and feet, and there are also problems such as stains due to the use of oil.

Poultices containing chili pepper extract etc. are said to raise skin temperature by 1 to 2°C by stimulating the peripheral thermal sensation, and are widely used because they are easy to use. Frequent skin side effects (skin disorders) such as redness, rashes, and rashes occur, and there are many other problems such as strong skin irritation when taking a bath after application, and their frequent use is dangerous.

Furthermore, in order to fully obtain the therapeutic effect of a hot compress, it may be required to provide a constant level of heat retention. For example, when a hot compress is used in close contact with the human body, it may be necessary to apply the hot compress to each other for a long time at a constant skin temperature, for example, at a temperature that does not exceed about 43°C.

However, the above-mentioned various hot compresses do not at all satisfy this continuous heat retaining ability.

Furthermore, although disposable hand warmers have the advantage of being easy to use, they do not have sufficient temperature control, so they may reach temperatures that are too high and cause low-temperature burns, or they cannot be used with cushioning materials such as cloth. Even in the case of crimping the skin to the skin using a crimper, it is difficult for the temperature to be transferred to areas other than the crimped area, and there is also a problem in terms of effective use of heat.

Recently, from this point of view, a heat generating bag that integrates a disposable body warmer and a non-stick adhesive layer has been proposed (Japanese Utility Model Publication No. 34735/1983).

In other words, this heating bag is made by pasting together a disposable body warmer and a non-transferable adhesive layer, and by applying it locally, the heat generated from the heating element composition inside the disposable body warmer is non-transferred. It is transmitted to the skin surface to which it is applied via the adhesive layer.

(C) Problems to be Solved by the Invention Although this product is extremely easy to use because it can be taken out of the bag and applied directly to the affected area, the following problems remain.

That is, (1) this product uses a permeable member and a perforated film as the ventilation layer, but the pores in the effective film are large, and the supply of oxygen is concentrated at the perforated parts of the perforated film, resulting in an exothermic reaction. is biased and the temperature distribution becomes uneven.

■Because of the high air permeability and moisture permeability, the temperature characteristics are unstable and the temperature control is insufficient.Secondly, there are difficulties in maintaining a safe temperature on the skin surface to which it is applied. Therefore, there are problems such as the temperature being too high, causing low-temperature burns, and the temperature being too low, a sufficient thermal effect cannot be obtained.

■ Furthermore, during use, the heating element composition moves within the bag and becomes uneven, resulting in variations in the temperature distribution of the hot compress structure. Since it is used by pasting it on, there are problems such as a feeling of discomfort at the application site.

In this case, the hot compress structure can be shaken to make the temperature distribution uniform and to eliminate the discomfort of the user.
This causes annoyance.

(2) As mentioned in (2) and (2) above, the exothermic reaction is non-uniform and it is difficult to control the temperature, which causes problems such as rapid changes in temperature rise and fall and large variations.

[F] In particular, the skin is warmed by heat, which increases local sweating, promotes blood circulation, and activates local metabolism. Sweat and waste products boil off on the skin surface of the site, making the skin unhygienic and reducing its adhesion to the skin, making it impossible to obtain sufficient effects.

For this reason, the reality is that it has not yet been put into practical use.

The present invention always controls the skin temperature within a certain range without lowering the skin surface temperature by removing vaporization heat from the skin surface at a predetermined temperature, that is, when used in close contact with the human body or underwear. To provide a hot compress structure that effectively performs thermotherapy by maintaining a sufficient temperature for a sufficient duration, and also quickly absorbs sweat and waste products generated on the skin surface due to heat to make the skin surface sanitary. purpose.

(d) Means for Solving the Problems In order to achieve the above object, the sweat-absorbing heating body structure of the present invention has an open part whose front surface is formed of a breathable film and whose back surface is formed of a support. A heating element structure comprising a heating element composition that generates heat due to the presence of air is sealed inside a flat bag with no heat, and a pressure-sensitive adhesive layer is partially provided on the back surface of the flat bag. The support is made of a laminated film in which a water-absorbing layer is interposed between a synthetic resin film and a porous synthetic resin film having a maximum pore diameter of 30 μω or less, and the exposed surface of the porous synthetic resin film in the support is pressure-sensitive. An adhesive layer is partially formed.

The present invention will be explained in detail below.

The flat bag used in the present invention has a front surface formed of a breathable film, a back surface formed of a support, and a flat bag with no open part joined at the peripheral edge. This is for interposing and enclosing a heating element composition that generates heat in the presence of air between the substrate and the support.

This breathable film is not particularly limited as long as it has breathability and is made of synthetic resin.

This breathable film does not matter whether it is a single layer film or a composite film with two or more layers, but the breathability and moisture permeability may be controlled by making it a composite film with two or more layers. .

The thickness of the above-mentioned breathable film is not particularly limited, but from the viewpoint of air permeability, strength, processability such as heat fusion, and handleability, 5 to 50 μm 1 especially 20 to 40 μl
It is preferable that

According to the experimental results of the present inventors, in order to prevent skin respiration from being impaired even if the composition of the heating element composition is varied over a wide range, the moisture permeability of the breathable film must meet the ASTM standards. (E-96-80D method) 100
It is in the range of ~400g/re2/241+r, and by controlling it within this range, it is safe without causing low-temperature burns, and is suitable for thermal effects.
℃ temperature can be applied to the local skin for a long period of time.

The above ASTM method (E-96-80D method) is the method described below.

That is, the cup has an inner diameter (diameter) of 6.18 cm and a height of 1°5 cm.
Pour 20 ml of pure water into a container, cover the top of the container with a breathable film, fix it with a cap, and keep it at a constant temperature (32 m).
, 2°C) and constant humidity (50%) for 24 hours.

Next, the amount of decrease in water in this container is measured, and the amount of water released (transpiration) is converted into [fi/m2/24 brl and displayed.

In the present invention, by using the above-mentioned specific breathable film, the amount of air (oxygen) supplied to the heating element composition is constantly controlled, and the reaction heat and water vapor are released, that is, in the heating element composition. A balance is maintained with heat dissipation due to transpiration of water, and as a result, the required temperature range in which a thermal effect can be obtained can be maintained for a long period of time.

The moisture permeability of the breathable film is 100 g/m”/2
If it is less than 4 hr, the calorific value will be too small and the thermal effect will be poor, so it is not preferable (on the other hand, 400 g / 2 / 2
If it exceeds 4 br, the temperature may rise and the maximum temperature may exceed 50°C, which is also not preferable because there is a risk of low-temperature burns. g/m2/241+
A range of r is most desirable.

In other words, there is a correlation between moisture permeability and air permeability, and when the moisture permeability is high, the air permeability is also high.Moreover, in order to control the temperature of the heating element composition, the required temperature is controlled by the moisture permeability rather than the air permeability. This gives us a range.

The polymeric material forming this breathable film is not particularly limited as long as it can be formed into a film and exhibits breathability through methods such as stretching and/or extraction of soluble fillers. , Specifically, for example, polyethylene, polypropylene, cellophane, polyester, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, ethylene-vinyl acetate copolymer, polycarbonate,
Examples include hydrochloric acid rubber, but among these, polyethylene is preferred because a homogeneous breathable film can be obtained by stretching or the like.

The support is composed of a product/1 film in which a water-absorbing layer is interposed between a synthetic resin l11t film and a porous synthetic resin film having a maximum pore diameter of 30 μm or less.

The synthetic resin film used here is a film made of the above-mentioned polymeric material, but it is non-moisture-permeable or non-moisture-permeable so that the temperature of the skin surface does not change due to the evaporation of moisture such as sweat from the skin surface. Materials with low moisture permeability can be used.

The water-absorbing layer used in the present invention is a water-absorbing layer formed of a water-absorbing polymer alone or a water-absorbing composition consisting of a water-absorbing polymer and an inorganic water-absorbing agent. The thickness of this water-absorbing layer is not particularly limited, but from the viewpoint of water absorption and air permeability, the thickness is 2 to 500 μm, particularly 20 to 3 μm.
It is desirable to set it to 00μ ugly.

The above-mentioned water-absorbing polymer is not particularly limited, but it is desirable that the water-absorbing capacity is 15 times or more, preferably 20 times or more, its own weight. Specifically,
Starch-polyacrylonitrile copolymer disclosed in Japanese Patent Publication No. 95, cross-linked polyfulkylene oxide disclosed in Japanese Patent Publication No. 51-39672, Japanese Patent Publication No. 53-13
Saponified vinyl ester-ethylenically unsaturated carboxylic acid copolymer disclosed in No. 495, Japanese Patent Publication No. 1983-
Self-crosslinking polyacrylate obtained by the reverse phase suspension polymerization method disclosed in Publication No. 30710, JP-A-54
Reaction product of polyvinyl alcohol polymer and cyclic anhydride disclosed in JP-A No. 20093, JP-A-55
Preferred are crosslinked polyacrylates disclosed in Japanese Patent No. 84305.

This water-absorbing layer absorbs sweat and waste products when the sweat-absorbing heating body structure is attached to the skin, causing sweating due to skin breathing, etc., and absorbs waste products. It improves the adhesion between objects and the skin, and keeps the skin surface always hygienic.

The above-mentioned inorganic water-absorbing agent is one that improves the water-absorbing ability of the water-absorbing layer and realizes long-term sweat absorption and waste absorption of the sweat-absorbing heating structure, and specifically, activated carbon, zeolite, and zeolite. porous material, cristobalite,
Examples include silica-based porous materials, calcium silicate, and the like.

Furthermore, in order to improve the adhesion between the above synthetic resin film and the porous synthetic resin film described below, a hydrophilic adhesive such as a polyurethane adhesive may be added to the water absorbing layer, if desired. is desirable. In this case, the amount of adhesive added is 50 parts by weight per 100 parts by weight of the water-absorbing polymer.
It is preferable to mix in an amount of 0 parts by weight or less, preferably 250 parts by weight or less.

The porous synthetic resin film used in the present invention prevents direct contact between the water absorbing layer and the living body, and allows sweat and waste products to be absorbed between the skin and the water absorbing layer through this film. Its maximum pore size is 30 μl or less, especially 1-15 μl
It belongs to m.

If the maximum pore diameter of this porous synthetic resin film exceeds 30 μm, the strength of the film will decrease considerably, and it may be partially torn during handling, or when making bags with heat-F seal, etc.
This is not preferable since the sealing strength may decrease and peeling may occur, and the water-absorbing polymer may ooze out from the surface of the porous synthetic resin film.

In this case, the maximum pore diameter is measured by the bubble point method using a Coulter bolometer manufactured by Fuerter Electronics.

In addition, the thickness of this porous synthetic 1fJI film is not particularly limited, but from the viewpoint of film strength, processability such as heat fusion, and handleability, it should be less than 200μ, especially 20 to 80μ. It is preferable that

The synthetic resin for forming this porous synthetic 11112t film is one that can be made into a film, and a film with a maximum pore diameter of 30 μm or less can be obtained by various methods such as stretching, extraction of soluble substances after stretching, and extraction of soluble substances. There is no particular limitation as long as it is possible.

Furthermore, as the synthetic resin, hydrophilic synthetic resins and hydrophilized synthetic resins are particularly desirable because they have good moisture and water vapor permeability.

The method for producing this porous synthetic resin film is as follows:
Although not particularly limited, specific examples include the following.

That is, (a) the polyolefin resin is melt-stretched, then heat-treated and re-stretched.

(b) Synthetic 01 fat mixed with liquid or solid is formed into a film, and then the mixed liquid or solid is extracted.

(c) A film is formed from a synthetic resin, and seven holes are made uniformly over the entire surface using a very fine needle to make it porous.

(d) After adding a filler to a synthetic resin and melting it to form a film, it is stretched at least uniaxially, or at least a little (in both cases) after axial stretching, the soluble filler is extracted using water, an acid, or an alkali. .

In particular, in the case of (d) above, polyolefin resin is preferable as the synthetic resin because of its good productivity (and low cost).

Examples of the polyolefin resin include homopolymers or copolymers such as polyethylene, polypropylene, and polybutadiene, and blend polymers thereof, and in particular, polypropylene (pp), high-density polyethylene (I (DPE)), and linear low-density polyethylene. (L-LDPE) is more preferable from the above point of view.

Inorganic and organic fillers are used as the filler, and the inorganic fillers include calcium carbonate, talc, clay kaolin, silica, diatom, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, and water. Aluminum oxide, zinc oxide, magnesium hydroxide, calcium oxide, magnesium oxide, titanium oxide, alumina, mica, asbestos powder, glass powder, shirasu balloon, zeolite, clay silicate, etc. are used, especially calcium carbonate, talc, clay silica, Diatomaceous earth, barium sulfate, etc. are suitable, while organic fillers include wood flour, bulb, melamine powder, silicone resin powder, etc.

The above-mentioned filler has an average particle diameter of 10 μm or less, especially from the viewpoint of miscibility with synthetic resin and homogenization of the film.
It is preferably in the range of 5 to 5 μm, and the amount added is 50 to 300 parts by weight per 100 parts by weight of the synthetic resin.
L parts, preferably 100 to 200 parts by weight.

The support is formed of a laminated film in which a water-absorbing layer is interposed between the above-mentioned synthetic resin film and a porous synthetic resin film.

In the present invention, a heating element composition that generates heat due to the presence of air is sealed inside the flat bag, and the heating element composition can maintain a safe temperature for a long period of time without causing low-temperature burns. There is no particular limitation as long as it can be maintained, and specifically, known heating element compositions used in disposable body warmers and the like can be used.

By the way, each component in the above-mentioned heating element composition varies depending on the manufacturing method and purpose, but any type, shape, or purity can be used as long as it is used in a disposable body warmer.

The above-mentioned heating element composition is one that causes an exothermic reaction in the presence of air. For example, this heating element composition may cause an oxidation reaction between iron powder and the iron powder, or Activated carbon that has a regulating and catalytic effect, sodium chloride that destroys the oxide film on the surface of the iron powder and allows the oxidation reaction of the iron powder to proceed smoothly, water, and a water-retaining material used to make a sticky layer with the water. In this case, the heating element composition has a component ratio of 35 to 80% by weight of iron, 1 to 10% by weight of activated carbon, and 1 to 10% of sodium chloride.
Preferably, it contains 5 to 45% of water and 1 to 45am% of water retention agent. Outside this range, the thermal effect is poor and the desired effect may not be obtained, or there is a risk of low-temperature burns. Moreover, it is impossible to obtain a sweat-absorbing heating body structure that exhibits an excellent thermal effect over a long period of time.

The water retention agent is not particularly limited as long as it has high water retention and eliminates stickiness in the heating element composition, but specific examples include vermiculite, silica powder, wood flour, At least one type of water-absorbing polymer can be mentioned.

The heating element composition is uniformly enclosed in the flat bag, but the filling amount is preferably in the range of 500 to 7000 g/m'', and the filling amount is 5008/I
If it is less than I2, the amount of the heating element composition charged is too small to maintain the desired temperature for a long time, and an excellent hot compress effect cannot be obtained (1, on the other hand, 7000 g/m"
Exceeding the heating element composition is undesirable because the filling amount of the heating element composition becomes excessive, making bagging difficult, and the hot compress structure becomes too thick, resulting in poor usability and portability, as well as being uneconomical. be.

The sweat-absorbing heating element structure of the present invention has a pressure-sensitive structure on the side opposite to the breathable film side, that is, on the exposed surface of the porous synthetic resin film in the support, in a flat bag formed by enclosing the above-mentioned heating element composition. An adhesive layer is partially formed.

In the present invention, the pressure-sensitive adhesive layer is partially formed on the exposed surface of the porous synthetic resin film, but with this structure, the area where the pressure-sensitive adhesive layer is formed does not come into contact with the skin. At the same time, in areas where this layer is not formed, sweat and waste products are effectively absorbed by the water-absorbing layer, cleaning the skin surface.

The above-mentioned pressure-sensitive adhesive is not particularly limited as long as it has good adhesion to the skin, and examples include acrylic adhesives, rubber adhesives such as synthetic rubber and natural rubber, and vinyl adhesives. Examples include adhesives, terpene resins, and water-soluble rosins.

Further, the pressure-sensitive adhesive layer is partially formed on the exposed surface of the porous synthetic resin film on the support. The formation method is not particularly limited, and the pressure-sensitive adhesive layer may be interspersed over the entire surface of the porous synthetic resin film, or the pressure-sensitive adhesive layer may be formed in a lattice pattern, a sea island pattern, etc. The pressure-sensitive adhesive layer may be formed in the form of diagonal, crosswise, striped or horizontal stripes, and in short, the pressure sensitive adhesive layer may be formed mutually over 10 to 80%, particularly 30 to 65%, of the total area. The point is that it can be formed arbitrarily regardless of the pattern. In this case, when the pressure-sensitive adhesive layer is scattered, any shape such as a circle, an ellipse, a rectangle, or a triangle can be adopted.

If the area of the pressure-sensitive adhesive layer is less than 10%, the area is too small and there is a problem in terms of adhesion to the skin, which is undesirable.On the other hand, if it exceeds 80%, absorption of sweat and waste products decreases. , which is not preferable because it makes the skin surface unhygienic.

In the sweat-absorbing heating element structure of the present invention, the heating element composition includes 40 to 75% by weight of iron powder and 1 to 10% by weight of sodium chloride.
, 10 to 40% by weight of water, and 1 to 40% by weight of a water retention agent, and the moisture permeability of the breathable film meets ASTM method (E-9).
6-80D method) 100-400g/w2/24hr
is preferable for the reasons stated below.

In this way, by using a specific breathable film and a specific heating element composition, the amount of air supplied to the heating element composition can be constantly controlled through the interaction between the two, and this A balance is maintained between the heat of reaction and the release of water vapor, that is, the heat dissipated by transpiration of water in the heating element composition,
Safe and effective thermal treatment can be obtained over a long period of time without causing low-temperature burns.

In the sweat-absorbing heating body structure of the present invention, the heating element composition includes 40 to 75% by weight of iron powder, 1 to 10% by weight of activated carbon, 1 to 10% by weight of sodium chloride, 10 to 40% by weight of water, and 1 to 10% by weight of water retention agent. 40% by weight, and the moisture permeability of the breathable film is according to ASTM method (E-96-80D method) t'l 00-
400B/+e''/24hr is preferable for the reasons described below.

By blending activated carbon in this way, compared to the heating element composition described above, this activated carbon activates oxygen in the air, and therefore promotes the initial reaction between iron powder and oxygen. As a result, in addition to the above-mentioned effects, the initial temperature rise is extremely good, and therefore excellent thermal treatment can be obtained for a long time.

In the sweat-absorbing heating element structure of the present invention, the heating element composition is uniformly enclosed in the flat bag, but the filling amount is SOO
It is desirable to set it as the range of -7000g/1112.

If the filling amount of the heating element composition is less than 500 g/+a2, the filling amount will be too small to maintain the desired temperature over the Jlt time, and therefore an excellent thermal effect will not be obtained. /m2 is undesirable because the heating element composition will be filled in an excessive amount, making it difficult to pack the bag, and the structure will become too thick, resulting in poor usability and portability, as well as being unsuitable. It is.

In the sweat-absorbing heating body structure of the present invention, the moisture permeability of the porous synthetic resin film is determined by the pore diameter and the degree of hydrophilicity of the film, and the moisture permeability is 100 8/m2.
/ By setting it to 24 hours or more, the moisture permeability, that is, the permeability of sweat and waste products, is good, and the sweat and waste products generated by perspiration are reliably absorbed, so that condensation etc. will not occur at the application site of this structure. This is desirable because it results in even better adhesion to the skin.

By the way, this moisture permeability was measured by the method described above.

In the sweat-absorbing heating body structure of the present invention, porous synthesis 1 (
Jl! R-films that have been treated with a hydrophilic agent can absorb sweat and waste matter at a much faster rate, preventing dew condensation, and can therefore be applied to areas that are prone to strong perspiration. The preferred hydrophilicity imparting agent is not particularly limited as long as it is provided on the surface of the porous synthetic resin film to improve the hydrophilicity of the film, and examples include glycerin, polyglycerin, ethylene glycol, polyethylene glycol, etc. Examples include polyhydric alcohols, various surfactants, and the like.

Methods for hydrophilizing the porous synthetic resin film using the hydrophilicity-imparting agent include a method in which the hydrophilicity-imparting agent is mixed into the porous synthetic resin film, and a method in which the hydrophilicity-imparting agent is mixed into the porous synthetic resin film. Applying a hydrophilic agent,
Examples include a method of dipping the film in an aqueous solution of a hydrophilicity-imparting agent, and a method of spraying this aqueous solution onto the film.

In the sweat-absorbing heating body structure of the present invention, it is preferable to partially interpose a water-absorbing layer because the amount of water absorbed can be adjusted.

In other words, a water absorbing layer is partially provided and other parts (synthetic resin film and porous synthetic resin film) are heat-sealed, or a hot melt adhesive is interposed in other parts to form a surface film (synthetic resin film). The film on the back (porous synthetic resin film) may be thermally bonded to the film on the back (porous synthetic resin film), and a water-absorbing layer that can be used at the same time as the heat-sealing of the front and back surfaces may be used. The embossing roll can be used to heat-seal the desired pattern.

In this case, a pressure-sensitive adhesive layer may be provided in a portion where this water-absorbing layer is not formed.

By the way, in order to manufacture the sweat-absorbing heating body structure of the present invention, no special technique or equipment is required, and it can be obtained by a conventional method.

Specifically, for example, a breathable film or a porous film
After applying a water-absorbing polymer or a coating liquid prepared by mixing it with a water-absorbing agent or adhesive onto the surface of one of the It m films by a gravure method, a roll coating method, or a silk screen method. , either the breathable film or the porous synthetic resin film is laminated together to form a support, and a pressure-sensitive adhesive coating solution is applied to the exposed surface of the porous synthetic resin Ta film on the support. is partially coated by a gravure method, roll coating method, silk screen method, etc. and dried to form a pressure-sensitive adhesive layer. Next, a releasable protective film is laminated on this pressure-sensitive adhesive layer.

In this case, from the viewpoints of adhesive strength between the breathable film and the porous synthetic resin film, water absorption amount, moisture absorption ability, etc., the water absorption layer may be provided on the entire surface or part of the film.

Next, in forming this sweat-absorbing heating element structure, one end of the peripheral part of the flat bag with a pressure-sensitive adhesive layer formed on the back side was left open, and the heating element composition was filled. Afterwards, this part is sealed using a heat seal or the like. In this way, the sweat-absorbing heating body structure of the present invention is completed.

As a result of having the above-mentioned characteristics, the sweat-absorbing heating body structure of the present invention can maintain a temperature of 38 to 43°C for a long time nT1, which is safe and does not exceed a certain temperature, which has been difficult in the past, and is suitable for a thermal effect.
It can be applied locally to the skin.

By applying the sweat-absorbing heating body structure of the present invention to the skin of a living body, the heat of the heating body composition is transmitted evenly and over the entire surface of the skin, and local blood circulation is promoted due to the heat generation. It not only improves local metabolism, but also improves adhesion to the skin by absorbing sweat and waste products from the skin surface. Moreover, by absorbing sweat and waste products, the skin surface becomes hygienic. It prevents itching and rashes on the skin, and heat treatment can be performed for a long time.

The sweat-absorbing heating body structure of the present invention is stored in an airtight bag and distributed, but in this case, it is stored singly or in a plurality of pieces, folded and stored, depending on the usage. It can be cut and used as desired.

(e) Effect In the sweat-absorbing heating body structure of the present invention, a specific support characterized by a water-absorbing layer is used, and a pressure-sensitive adhesive layer is partially applied to the exposed surface of the porous synthetic resin film in the support. By forming this layer on the skin, this water-absorbing layer effectively absorbs sweat and waste products, keeping the skin surface always hygienic.Moreover, the pressure-sensitive adhesive layer has a substance that helps promote transdermal absorption of drugs and drugs. It does not contain any agents, so it has strong adhesion to the skin.
It has the effect of good adhesion to the skin.

In addition, this sweat-absorbing heating body structure contains a heating body composition and air (
It has the ability to maintain a predetermined temperature for a long period of time while maintaining a balance between heat generation due to the reaction of oxygen (oxygen) and heat dissipation due to evaporation of water in the heating element composition.

Furthermore, in this sweat-absorbing heating element structure, the heat of the heating element composition is transmitted evenly and over the entire surface of the skin, and this heat promotes local blood circulation and improves local metabolism. Moreover, it does not remove latent heat of vaporization from the skin surface, so the skin temperature remains constant, and it has an effect that is effective in treating chronic painful diseases.

That is, in the case of chronic painful diseases in the field of orthopedics, it is said that cooling the affected area is often not suitable for the purpose of treatment. For VF, chronic low back pain, joint pain, neuralgia, rheumatism, etc., heating is often more effective than cooling. This method is widely used as thermotherapy. The reason why heat therapy is effective for these chronic diseases is said to be due to its pain relief effect by relaxing the muscle lining in the affected area, improving blood flow stasis, and promoting the metabolism of pain-sensing components. From this point of view, it has an effective effect on bedsores.

D) Examples Hereinafter, the present invention will be explained in detail based on Examples, but the present invention is not limited thereto.

In Figure 1 of 1 of 1, (1) is a sweat-absorbing heating body structure,
The sweat-absorbing heating body structure (1) includes a flat bag (2), a heating element composition (3) that generates heat due to the presence of air, and is sealed inside the flat bag (2). The flat bag (2
) consists of a pressure-sensitive adhesive N (4) partially provided on the back side of the plate.

The flat bag (2) has a front surface made of an air-permeable film (5), and a back surface made of a support (6), which is flat without an open part.

In this case, the breathable film (5) consists of a breathable base film (5a) and a breathable reinforcing film (5b).

Specifically, the breathable film (5) is formed by laminating a breathable base film (5a) made of synthetic resin and a breathable reinforcing film (5b) made of woven or nonwoven fabric, and then The laminated film is formed by stretching or by extracting the filler from the stretched film and adjusting its moisture permeability within the above range.

Further, instead of the above embodiment, the breathable film (5) may be formed only of the breathable base film (5a) without using the breathable reinforcing film (5b).

By the way, it is preferable that the softness of this breathable film (5) is 2.5 g or less in a Loop Stability 7 Nest Tester. In this way, the heating element composition (3
) absorbs oxygen, the bag (2) easily contracts, the heating element composition (3) and the breathable film (5) come into close contact, and the heating element composition (3) is easily shifted. This is advantageous because it is prevented.

1. The support (6) consists of a synthetic resin film (6a) and a porous synthetic resin film (6c) with a maximum pore size of 30 μl or less.
), and a pressure sensitive adhesive NJ (4) is partially formed on the exposed surface of the porous synthetic resin film (6c) in the support (6). has been done.

Further, the pressure sensitive adhesive 1 (4) is partially formed on the exposed surface of the porous synthetic resin film (6c) in the support (6), but the method of forming this partially is particularly limited. Instead, the pressure-sensitive adhesive layer (4) may be scattered over the entire surface of the porous synthetic resin film (6c) (
, and pressure-sensitive adhesive/I! 1 (4) in a lattice shape, sea island shape,
The pressure-sensitive adhesive M(4) may be formed in a diagonal cross shape, a vertical stripe shape, or a horizontal stripe shape, and in short, it is sufficient to form the pressure sensitive adhesive M(4) over 10 to 80%, particularly 30 to 65%, of the total area. can be formed arbitrarily regardless of its pattern.

In this case, when the pressure-sensitive adhesive layer (4) is scattered, any shape such as a circle, an ellipse, a rectangle, or a triangle can be adopted.

In the above structural example, the pressure-sensitive adhesive layer (4) is formed in a horizontal stripe shape.

If the area of the pressure-sensitive adhesive layer (4) is less than 10%, the area of the pressure-sensitive adhesive layer (4) is too small and there is a problem in terms of adhesion and adhesion with the skin. If it exceeds 1%, the absorbency of sweat and waste products decreases, making the skin surface unhygienic and undesirable.

In addition, (7) is a protective film, and the protective film (7)
) the surface of the pressure sensitive adhesive layer (4) is covered and protected.

Then, the sweat-absorbing heating body structure (1) of the present invention is enclosed in an airtight bag (C) and distributed.

The sweat-absorbing heating body structure (1) of the present invention has the above-mentioned composition, and when it is used, the sweat-absorbing heating body structure (1) is taken out from the airtight bag (C) and the protective film (6) is attached. Peel off,
The pressure-sensitive adhesive layer (4) is used in close contact with the affected area.

By doing so, at the application site, it improves local metabolism by promoting the thermal effect and local blood circulation due to this thermal heat, and therefore, the skin temperature remains constant and chronic pain can be alleviated. It is effective in treating diseases.

FIG. 2 shows another structural example of the sweat-absorbing heating body structure (1) of the present invention, (1) is a sweat-absorbing heating body structure, and the sweat-absorbing heating body structure I (1) is a flat structure. A heating element composition (3) that generates heat due to the presence of air, which is sealed inside the flat bag (2), and a periphery on the back surface of the flat bag (2). Pressure sensitive adhesive provided in the section /1 (4
Consists of a).

The flat bag body (2) has its constituent members and hM
n is the same as above, and this flat bag (2)
The support (6) is composed of a synthetic resin film and a porous synthetic resin film with a maximum pore diameter of 30 microns or less with a water absorbing layer interposed between them.
A pressure-sensitive adhesive layer (4a) is formed on the periphery of the exposed surface of the porous synthetic resin film, and a porous synthetic resin film (6) is formed in the area surrounded by the pressure-sensitive adhesive layer (4a).
C) is exposed.

6. Manufacture of the support used in the present invention In the following, (a) breathable film, (b) material for the water-absorbing layer, and (C) porous synthetic resin film are each listed below. was used.

(IL) Synthetic wood 111t film density 0.9278/C1l', MI=2.0, thickness 30
μsui polyethylene film.

(b) Starch-polyacrylic acid graft copolymer (manufactured by Sanyo Chemical Co., Ltd., Sunwet IM=300) as the water-absorbing polymer for the water-absorbing layer
) was used, and as the urethane adhesive, (UPS 75A) manufactured by Dainippon Ink Co., Ltd. was used.

(c) Porous synthetic resin film linear low density polyethylene (density 0.927g/Cm',
MI=2.0) Average particle size 2°5μ per 100 parts by weight
By adding 150 m - 51 parts of barium sulfate and melting it to form a film, it was stretched to form a film with a thickness of 30 μm and a moisture permeability of 1400 g/l112/24hrS'IIt.
A film with a large pore diameter of 7.5 μm was obtained. Next, in order to improve the water absorption rate of this film, 7
Air/el-based surfactant (manufactured by Kyubishi Yuka Co., Ltd., MTN-
F684) A 10% by weight isopropyl alcohol solution was applied by dipping and subjected to hydrophilic treatment.

100 parts by weight of the urethane adhesive described in (b) above and 100 parts by weight of the water-absorbing polymer are mixed at low speed in a homo mixer, and this is applied to the surface of the synthetic resin film described in (a) above using gravure. After coating with a roll to form a water-absorbing layer (thickness: 30 μm), the porous synthetic resin film described in (0) above was laminated on the water-absorbing layer, and this laminated film was 40 mm long and 30 nm wide. Cut it into a rectangle,
A support was obtained.

On the other hand, the breathable film used was one made of polyethylene [the moisture permeability was determined by ASTM method (E-96-80D)].
185 B/v2/24 hrl.

When overlapping the above-mentioned support and breathable film, the synthetic resin film side of the support and the breathable film are laminated so that they are in contact with each other, and the three peripheral edges of the laminate are heat-sealed. A bag is formed, and the inside of the bag is filled with a heating element composition (3) that generates heat due to the presence of air (1666.7g/2), which will be described later.
This open end was heat sealed to obtain a heating element structure.

Composition of 60% by weight of RZ iron powder, 3% by weight of activated carbon, 3% by weight of sodium chloride, 3% by weight of water retention agent, and 31% by weight of water. Using this composition, the following sweat-absorbing heating element structure ( 1
) was formed.

Example 1 A pressure-sensitive adhesive layer, which will be described later, was formed in horizontal stripes on the exposed surface of a porous synthetic resin film in the support of a heating element structure. In this case, the area where the pressure-sensitive adhesive layer is formed is 60%, and therefore, the remaining 40% of the porous synthetic resin film on the support is exposed.

Pressure-sensitive adhesive layer: 100 parts by weight of isobutyl acrylate, 100 parts by weight of isooctyl acrylate, and 6 parts by weight of ethyl acetate.
0 parts by weight were charged into a reaction vessel under an inert gas atmosphere, 0.5 parts by weight of azoisobutyronitrile was added as a polymerization initiator to initiate polymerization, and ethyl acetate was added dropwise to raise the reaction temperature to 60°C. The rtt+polymerization reaction was carried out at 10 hours while controlling the temperature to ~65°C to obtain a copolymer solution having a solid content concentration of 35% by weight and a solution viscosity of 425 voids at a temperature of 25°C.

This copolymer solution was applied onto the release liner to a thickness of 5 mm after drying.
Apply it partially (in this case, in stripes) so that the volume is 0 μl, and dry to form a pressure-sensitive #adhesive layer (60% of the total area).
This was transferred onto the exposed surface of the porous synthetic resin film in the support of the heating element structure.

In this way, a sweat-absorbing heating element structure of the present invention was obtained.

Next, the exposed surface of the pressure-sensitive adhesive layer in this sweat-absorbing heating element structure was covered with a releasable protective film, and then this was sealed in an airtight bag.

Example 2 90 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of ethyl acrylate, and 50 parts by weight of ethyl zoacetate
A polymerization reaction was carried out in the same manner as in Example 1 using parts by weight to obtain a copolymer solution having a solid content concentration of 38% by weight, a temperature of 25° C., and a viscosity of 330 poise.

The resulting copolymer solution is applied onto a mold release liner so that the thickness after drying is 50 μm, in this case 5 m in diameter.
After coating the m circular shape in a dotted manner, it dries to form a pressure-sensitive adhesive layer (65% of the total area), and this is applied to the exposed surface of the porous synthetic resin film in the support of the heating element structure. transferred to.

In this way, a sweat-absorbing heating element vtTL of the present invention was obtained.

Next, the exposed surface of the pressure-sensitive adhesive layer in this sweat-absorbing heating element structure is covered with a releasable protective film, and then this is enclosed in an airtight bag.

Example 3 Acrylic @ 2-ethylhexyl ester 90 fi parts,
Using 5 parts by weight of acrylic fi, 5 parts by weight of vinyl acetate and 50 parts by weight of ethyl acetate, a polymerization reaction was carried out in the same manner as in Example 1 to obtain a viscosity of 60% at a solid content concentration of 40% by weight and a temperature of 25°C.
A copolymer solution with zero voids was obtained.

The resulting copolymer solution is applied partially onto the release liner to a dry thickness of 50 μm, in this case in the form of vertical stripes, and dried to form a pressure-sensitive adhesive layer over the entire area. 45% of
), and this was transferred onto the exposed surface of the porous synthetic resin film in the support of the heating element structure.

In this way, a sweat-absorbing heating element structure of the present invention was obtained.

Next, the exposed surface of the pressure-sensitive adhesive layer in this sweat-absorbing heating element structure was covered with a releasable protective film, and then this was sealed in an airtight bag.

Example 4 'J! A polymerization reaction was carried out in the same manner as in Example 1 to obtain a copolymer solution having a solid content concentration of 38% by weight, a temperature of 25° C., and a viscosity of 330°.

The obtained copolymer solution was coated on the release liner in vertical stripes so that the thickness after drying was 50 μm, and dried to form a pressure-sensitive adhesive layer (65% of the total area). This was transferred onto the exposed surface of the porous synthetic four-layer film in the support of the heating element structure.

Thus, the sweat-absorbing heating element NI of the present invention! Obtained a relic.

Next, the exposed surface of the pressure-sensitive adhesive layer in this sweat-absorbing heating element structure was covered with a releasable protective film, and then this was sealed in an airtight bag.

Example 5 The copolymer solution obtained in Example 2 was spread on the four peripheral edges of a release liner cut to the same size as the support of the heating element structure so that the thickness after drying was 50 μl, width 5+n+n. A pressure-sensitive adhesive layer was formed by coating and drying, and this was transferred to the exposed surface of the porous synthetic resin film in the support of the heating element structure.

In this way, the sweat-absorbing heating element structure of the present invention was formed.

Next, the exposed surface of the pressure-sensitive adhesive layer in this sweat-absorbing heating element structure was covered with a releasable protective film, and then this was sealed in an airtight bag.

Comparative Example A commercially available disposable body warmer was used in which an acrylic adhesive layer similar to that in Example 1 was formed on almost the entire surface (95%) of the side opposite to the perforated film side.

The following tests were conducted using the above examples and comparative examples.

The results of applying the above-mentioned Examples and Comparative Examples to chronic rheumatism patients will be described below. still,
Each test panel consisted of 10 people (male aged 60-65).

In each Example, the temperature of almost the entire surface of the applied skin reached 40.5°C 15 minutes after application, and it was observed that this temperature was maintained at 7°C for 5 hours.

Furthermore, after repeating this heat treatment for 7 days, the pain disappeared and he was able to lead a normal life.

Furthermore, F1. When peeled off after washing, it was found that the adhesion to the skin was good, sweat and waste products were absorbed by the water absorption layer, and there was no condensation (extremely hygienic).

On the other hand, in the comparative example, the temperature exceeded 45° C. 35 minutes after application, and the test was discontinued after 1 hour and 15 minutes because the temperature of the applied skin surface tended to rise further.

Furthermore, when this material was peeled off, sweat and waste matter remained and dew condensation occurred.

Furthermore, it was observed that 8 out of 10 patients felt itchy or sore skin.

From the above experiments, it was found that the sweat-absorbing heating body structure of the present invention can realize extremely excellent thermal therapy, so that chronic Il! It is effective in treating neuralgia, joint pain, chronic rheumatism, pressure sores, etc.

(g) Effects of the Invention Since the present invention is configured as described above, it achieves the effects described below.

In the sweat-absorbing heating body structure according to claim 1, a specific support body characterized by a water-absorbing layer is used, and a pressure-sensitive adhesive layer is partially applied to the exposed surface of the porous synthetic resin film in the support body. By forming this water-absorbing layer, it effectively absorbs sweat and waste products, keeping the skin surface always hygienic.
Furthermore, the pressure-sensitive adhesive layer does not contain a drug or an aid for promoting transdermal absorption of the drug, and therefore has a high adhesion to the skin and good adhesion to the skin.

In addition, this sweat-absorbing heating element structure maintains a predetermined temperature for a long time while maintaining a balance between heat generation between the heating element composition and air and heat radiation due to evaporation of the contents inside the heating element. It is possible.

Furthermore, in this sweat-absorbing heating element structure, the heat of the heating element composition is transmitted evenly and over the entire surface of the skin, and this heat promotes local blood circulation and improves local metabolism. However, it does not remove latent heat of vaporization from the skin surface, so the temperature of the skin remains constant, making it effective in treating chronic lower back pain, joint pain, neuralgia, rheumatism, and other painful diseases, as well as bedsores. be.

In the sweat-absorbing heating element structure according to claim 2, the heating element composition contains 40 to 75% by weight of iron powder and chloride.l) Rum 1 to 1
0% by weight, water 10-40% by weight, water retention agent 1-40fif
i%, and the above-mentioned breathable film has moisture permeability jlfA
100-400g7 by sTM method (E-96-80D method)
m2.24br, the amount of air (oxygen) supplied to the heating element composition is constantly controlled, and the reaction heat and water vapor are released, that is, heat radiation due to evaporation of water in the heating element composition. As a result, the desired temperature range can be maintained for a longer period of time.

In the sweat-absorbing heating body structure according to claim 3, the heating element composition contains 40 to 75% by weight of iron powder, 1 to 10% by weight of activated carbon, 1 to 10% by weight of chloride), and 10 to 40% by weight of water. , a water retention agent of 1 to 40% by weight, and the moisture permeability 1 of the breathable film is determined by the ASTM method (E-96-80D
(method) 100-400g/m2・24hr, this activated carbon activates oxygen in the air, and therefore, in addition to the above-mentioned effects, the temperature of the skin increases quickly during the initial application. , - layer exhibits excellent thermal effect.

In the sweat-absorbing heating body structure of Item 4, since the filling amount of the heating element composition is 500 to 7000 g/m2, a desired temperature can be maintained for a long time, and an excellent thermal effect can be obtained. In addition, it is easy to pack, has good usability and portability, and is economical.

In the sweat-absorbing heating body structure of claim 5, the porous synthetic resin film has a moisture permeability of 100 g/m2/24hr.
Because of the above 7F4 arrangement, the permeability of sweat and waste materials is good and they are absorbed into the water absorption layer. Therefore, there is no accumulation of sweat and waste materials in the application area of this structure, making it extremely hygienic. .

In the sweat-absorbing heating body structure of claim 6, the porous synthetic film (the fat film is subjected to hydrophilic treatment with a hydrophilicity imparting agent, so that the water absorption rate of sweat is significantly high, and condensation in the -layer can be prevented. Therefore, it has an effect that can be applied to areas with severe sweating.

In the sweat-absorbing heating body structure according to claim 7, by partially forming the water-absorbing layer, it is possible to adjust the water absorption amount and to perform thermal fusion in areas where there is no water-absorbing layer, and various properties can be achieved. A structure having the following properties is obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. PttJ2 is a perspective view showing another embodiment. (1)...Sweat-absorbing heating element structure, (2)...Flat-shaped bag, (3)...Heating element composition, (4), (4a).
...Pressure sensitive adhesive layer, (5) ... Breathable film, (
5a)...Breathable base film, (5b)...Breathable reinforcing film, (6)...Support, (6a)...
・Synthetic resin film, (611)...Water absorption layer, (6c
)... Porous interlayer 11Tt film, (7)...
Protective film, (C)... airtight bag body.

Claims (7)

[Claims] (1) A heating element composition that generates heat in the presence of air is sealed inside a flat bag with no open part, the front surface of which is formed of a breathable film and the back surface of which is formed of a support. A heating body structure in which a pressure-sensitive adhesive layer is partially provided on the back surface of a flat bag, the support having a water absorption layer between a synthetic resin film and a porous synthetic resin film with a maximum pore diameter of 30 μm or less. 1. A sweat-absorbing heating body structure comprising a laminated film with a porous synthetic resin film interposed therebetween, and a pressure-sensitive adhesive layer is partially formed on the exposed surface of a porous synthetic resin film in the support. (2) The heating element composition contains 40 to 75% by weight of iron powder, 1 to 10% by weight of sodium chloride, 10 to 40% by weight of water, and 1 water retention agent.
~40% by weight, and the moisture permeability of the breathable film is 100 to 40% by ASTM method (E-96-80D method).
2. The sweat-absorbing heating body structure according to claim 1, which has a heating capacity of 0 g/m^2/24 hr. (3) The heating element composition is 40 to 75% by weight of iron powder and 1 part of activated carbon.
~10% by weight, sodium chloride 1-10m%, water 10%
~40% by weight, and 1~40% by weight of a water retention agent, and the moisture permeability of the above-mentioned breathable film meets ASTM method (E-96-8
2. The sweat-absorbing heating body structure according to claim 1, which has a heat absorption rate of 100 to 4008/m^2/24hr by 0D method). (4) The filling amount of the heating element composition is 500 to 7000 g/m
The sweat-absorbing heating body structure according to any one of claims 1 to 3, which is ^2. (5) The moisture permeability of the porous synthetic resin film is 100g/m
The sweat-absorbing heating body structure according to any one of claims 1 to 4, wherein the heating time is 2/24 hr or more. (6) The sweat-absorbing heating body structure according to any one of claims 1 to 5, wherein the porous synthetic resin film is subjected to hydrophilic treatment with a hydrophilicity imparting agent. (7) The sweat-absorbing heating body structure according to any one of claims 1 to 6, wherein the water-absorbing layer is partially interposed.