JP2001217587A - Adhesive sheet for electromagnetic wave shielding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic wave shielding adhesive sheet which protects a medical equipment such as a pace maker embedded inside the body from malfunctioning caused by external electromagnetic wave and the like. SOLUTION: An adhesive layer is formed on one side of a shrinkable sheet wherein a conductive sheet is laminated on the other side. It is preferred by a patient with allergy to metal that the shrinkable sheet is larger than the conductive sheet. A metal foil, a plastic film on which a metal is vapor- deposited, a piece of cloth of metallic fibers, or a piece of clothe with metallic coating is selected as the conductive sheet. The adhesive layer is preferred to be formed by pattern coating. The electromagnetic wave shielding adhesive sheet is directly pasted on the skin or on clothes such as underwear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet for shielding an electromagnetic wave used to protect a medical device, such as a cardiac pacemaker, which is worn inside the body, from malfunction caused by an electromagnetic wave or the like.

[0002]

2. Description of the Related Art With the recent development of the information society, various types of O
The widespread use of A-devices and communication devices is remarkable. In particular, the spread of mobile phones, regardless of age or gender, is expected to reach the age of one person at a time. However, on the other hand, the influence on the human body by the electromagnetic waves generated by the electronic devices as described above is developing into a social problem.

In particular, the effects of electromagnetic waves generated on mobile phones on the human body have been investigated by various research institutions.
Among them, it has been reported that an electromagnetic wave generated from a mobile phone or the like causes a cardiac pacemaker to malfunction. Therefore, the Ministry of Posts and Telecommunications has issued a notice not to allow a mobile phone to come within 22 cm of a cardiac pacemaker.

[0004] However, in the social life in the modern world, it is not easy to avoid elevators, crowded trains, and crowds, and patients wearing a cardiac pacemaker are always anxious. . On the other hand, the number of patients with adult illness is increasing with changes in modern eating habits and lifestyles, and naturally the number of patients wearing a cardiac pacemaker is also increasing.

Under such circumstances, products such as aprons for electromagnetic wave shielding and clothes have been developed as a method for preventing malfunction of a cardiac pacemaker caused by electromagnetic waves. Also, Japanese Patent No. 2850954 and Japanese Patent Application Laid-Open
As described in JP-A-244399, a method has been proposed in which a pressure-sensitive adhesive layer is directly laminated on one side of a cloth made of metal-plated fibers to form a pressure-sensitive adhesive sheet for shielding, which is then attached to skin or clothing.

[0006]

However, in the case of the electromagnetic wave shielding apron and the clothes, the material itself is large and requires sewing, so that it is expensive, and there is a problem in terms of economy. In the case of an apron or clothing, removing it will have no effect, and there is a problem in use during hot summer months.

On the other hand, in the case of the above-mentioned shielding adhesive sheet, since its size is not so large, when it is used by attaching it to clothes, the shielding position between the shielding adhesive sheet attached to the clothes and the pacemaker by the movement of the body. In some cases, it may not be possible to achieve a sufficient effect. Also,
Depending on the type of clothing, electromagnetic waves may be wrapped between the shield adhesive sheet and the cardiac pacemaker.

Further, when the above-mentioned adhesive sheet for shielding is directly adhered to the skin surface, the side edges, so-called edges, of the fabric made of metal-plated fibers directly touch the skin, and the skin allergy develops in patients with metal allergy. Sometimes. In addition, since such fabrics generally do not have elasticity, they do not follow the movement of the patient's body during use, and may peel off or cause skin irritation due to the edges. When such skin irritation occurs, it is practically impossible to keep the skin adhered to the same place every day, and it is difficult to use the heart pacemaker wearer who needs to apply the skin to the same place.

[0009]

The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems of the conventional electromagnetic wave shielding material. As a result, the inventors have found that an adhesive layer is directly formed on a conductive sheet. Without forming an adhesive layer indirectly, it has been found that an adhesive sheet exhibiting excellent electromagnetic wave shielding properties can be obtained by laminating an elastic sheet on one side of a conductive sheet, thereby completing the present invention. Reached.

That is, the present invention relates to a pressure-sensitive adhesive sheet for electromagnetic wave shielding, characterized in that a pressure-sensitive adhesive layer is formed on the other surface of a stretchable sheet obtained by laminating a conductive sheet on one side.

In particular, the conductive sheet is preferably formed of at least one selected from a metal foil, a metal-deposited plastic film, a metal fiber fabric, and a metal-coated fabric.

Further, it is preferable that the conductive sheet is provided with a cut in order to impart elasticity, and the size of the elastic sheet is made larger than that of the conductive sheet so that the conductive sheet is formed from a peripheral portion thereof. It is preferable to protrude.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The conductive sheet in the pressure-sensitive adhesive sheet for electromagnetic wave shielding of the present invention is not particularly limited as long as it is a sheet made of a material having conductivity, but is not limited to copper, silver, aluminum, nickel and tin. And at least one selected from the group consisting of metal foils made of iron, stainless steel, etc., plastic films on which these metals are deposited, fabrics using fibers made of these metals, and fabrics on which these metals are plated or deposited. When the conductive sheet is formed from a metal foil or a metal-deposited plastic film, flexibility can be imparted by providing a cut. Of these, it is preferable to use a metal-plated or metal-deposited fabric in terms of flexibility.

The above-mentioned conductive sheet is 0.2 Ω / □ or less, particularly 0.1 Ω / □, in view of conductivity and electromagnetic wave shielding properties.
□ It is preferable to use a sheet having the following surface resistance value. In addition, the thickness of the conductive sheet is 5 to 5 from the viewpoint of flexibility.
It is desirable to adopt one having a thickness of 500 μm, preferably 30 to 200 μm. Furthermore, in order to exhibit sufficient electromagnetic wave shielding properties, the size is 10 × 10 cm (100
cm ² ) or more, preferably 15 × 15 cm (225 cm
² ) Above. In addition, it is preferable to set the size to 20 × 20 cm (400 cm ² ) or less from the size of the body part (chest) to be stuck. The shape is not limited to a square,
An arbitrary shape can be selected according to the shape of the cardiac pacemaker.

Further, in the present invention, the above-mentioned conductive sheet is laminated on one side of a stretchable sheet described later. However, if the stretchability of the stretchable sheet is impaired by lamination, the effect of the present invention cannot be sufficiently exhibited. When using a conductive sheet that does not have elasticity such as based on an elastic plastic film, it is possible to impart elasticity by providing slits or cross-shaped cuts in the conductive sheet. it can.

In the present invention, the stretchable sheet obtained by laminating the above-mentioned conductive sheet on one side has stretchability that can sufficiently follow the movement of the body even when the electromagnetic wave shielding pressure-sensitive adhesive sheet of the present invention is adhered to the skin surface. Yes, the thickness is usually about 20 to 1000 μm, preferably about 30 to 500 μm. As a specific material, for example, polyester,
Examples include polypropylene, polyethylene, polyether, polyamide, polyvinyl chloride, ethylene / vinyl acetate copolymer, polyurethane, rayon, cotton, silk, hemp and the like.

Also, these materials are used to form a sheet, but the film or sheet, woven or non-woven fabric,
It may be a fabric such as a knitted fabric. When the material does not have elasticity, it goes without saying that elasticity can be imparted by forming the material into a cloth. Among these, a preferred elastic sheet is a plastic fabric such as a polyurethane nonwoven fabric.

Further, when the above-mentioned stretchable sheet is stuck on the skin surface, it is more preferable to impart air permeability in order to prevent stuffiness and the like. The degree of air permeability (moisture permeability) is 300 g / m ² · 24 h or more, preferably 500 g / m
It is desirable that the ² · 24h or more.

As a method of laminating the conductive sheet on the stretchable sheet, a method of laminating the stretchable sheet and the conductive sheet with an adhesive or an adhesive, a method of fixing with a double-sided tape or a method of sticking with an adhesive tape. A method such as suturing with an overlap or a thread can be used. In addition, when bonding using an adhesive or an adhesive, it is not necessary to apply the adhesive or the adhesive on the entire surface, and the elastic sheet and the conductive sheet need only be kept from being separated from each other. Needless to say, the layers may be stacked.

Further, in the present invention, as described above, the conductive sheet is laminated on one surface of the stretchable sheet. However, when the electromagnetic wave shielding adhesive sheet of the present invention is adhered to the skin surface, the conductive sheet is laminated. The size of the elastic sheet is larger than the conductive sheet to prevent the side edge (edge part) of the sheet from coming into contact with the skin and causing skin irritation to a metal allergy patient. It is preferable that the layers are stacked so as to protrude from the portion. In this case, about 0.1 to 3 cm from the periphery of the conductive sheet, preferably 0.3 to 2 cm
It is preferable to laminate the elastic sheets so as to protrude by about cm. When less than 0.1 cm, it is difficult to sufficiently prevent the conductive sheet from coming into contact with the skin surface.
If it exceeds, the handleability tends to be poor.

In the present invention, the pressure-sensitive adhesive layer to be adhered to the skin surface or clothes is formed on the other surface of the stretchable sheet in which the conductive sheet is laminated on one surface, that is, on the side of the object to be adhered such as the skin surface. Is done. As the pressure-sensitive adhesive that can be used, those conventionally known as medical pressure-sensitive adhesives can be used, for example, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives,
A vinyl ether-based adhesive, a synthetic rubber-based adhesive, a semi-synthetic rubber-based adhesive, a natural rubber-based adhesive, and the like can be used. The thickness of these pressure-sensitive adhesives is usually about 20 to 80 μm.

The pressure-sensitive adhesive layer can be formed on the entire surface of one side of the stretchable sheet. However, the pressure-sensitive adhesive layer does not impede the air permeability of the stretchable sheet as much as possible and minimizes skin irritation when applied to the skin surface. In order to reduce the number, it is preferable to form by pattern application. As the pattern coating, specifically, a desired pattern such as a streak, a dot, or a grid can be arbitrarily selected, and the pattern can be formed only on the peripheral edge of the stretchable sheet to be formed.

In the present invention, the above-mentioned pressure-sensitive adhesive layer may be directly formed on a stretchable sheet. However, a so-called double-sided pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed on both sides of a support substrate such as a plastic sheet or a fabric is prepared in advance. In advance, the adhesive layer can be indirectly formed by attaching the adhesive sheet to one surface of the elastic sheet. In this case, it is preferable to use a double-sided pressure-sensitive adhesive sheet using a cloth so as not to impair the stretchability and air permeability of the stretchable sheet.

In order to protect the surface of the pressure-sensitive adhesive layer before use, the pressure-sensitive adhesive layer is formed by laminating a plastic film such as polyethylene or polypropylene or a plastic film such as polypropylene on one or both sides of paper or paper. It is preferable to attach a separator formed by applying a silicone resin, a fluororesin, or a long-chain alkyl-based release agent to one or both surfaces of a film or the like.

The pressure-sensitive adhesive sheet for electromagnetic wave shielding of the present invention having the above structure can be used by attaching it to the skin surface or clothes (for example, underwear).

[0026]

EXAMPLES Hereinafter, the pressure-sensitive adhesive sheet for electromagnetic wave shielding of the present invention will be specifically described based on examples. Needless to say, the present invention is not limited to these embodiments, but can be modified without departing from the technical idea of the present invention.

Example 1 90 parts by weight of 2-ethylhexyl acrylate and 10 parts by weight of 2-hydroxyethyl acrylate were copolymerized in an inert gas atmosphere using ethyl acetate as a polymerization solvent. A solution of an acrylic pressure-sensitive adhesive was obtained.

Next, the solid content of the obtained pressure-sensitive adhesive solution was 10%.
60 parts by weight of sorbitan trioleate and 0.16 parts by weight of a trifunctional isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) as a cross-linking agent are blended with 0 part by weight, and the separator is peeled off. Apply to the processing surface,
After drying, an adhesive layer having a thickness of 40 μm was formed.

Another pressure-sensitive adhesive layer was formed in the same manner as described above, and these pressure-sensitive adhesive layers were bonded to a polyester nonwoven fabric (trade name: Sontara 8010, manufactured by DuPont, basis weight: 45 g /
(m ² , 370 μm thick) to prepare a double-sided pressure-sensitive adhesive sheet, which was heated at 60 ° C. for 3 days to carry out a crosslinking treatment.

Next, a woven fabric made of metal-coated fibers (trade name: Sui-10-70, conductive fabric manufactured by Seiren Co., Ltd., metal: copper and tin, surface resistance 0.1 Ω /
□, 100 μm thick, 15 × 15 cm square) was converted to a polyurethane nonwoven fabric (trade name: Espansione, manufactured by Kanebo Co., Ltd., basis weight: 75 g / m ² , 300 μm thick, 17 cm × 17 cm)
(Corner) was laminated using a double-sided tape.

Finally, the double-sided pressure-sensitive adhesive sheet was bonded to one surface of the polyurethane nonwoven fabric to prepare a pressure-sensitive adhesive sheet for electromagnetic wave shielding of the present invention as shown in FIG.

Comparative Example 1 The acrylic pressure-sensitive adhesive layer having a thickness of 40 μm prepared in Example 1 was directly transferred to one side of the woven fabric made of the metal-coated fiber used in Example 1, and this was formed. The sheet was cut into a 15 x 15 cm square to prepare an adhesive sheet for electromagnetic wave shielding.

With respect to the pressure-sensitive adhesive sheet for electromagnetic wave shielding prepared above, the electromagnetic wave shielding property and the skin irritation during actual use were evaluated according to the following criteria. The results are shown in Table 1.

<Electromagnetic Wave Shielding Property> A human body model made of an aqueous gel containing polyacrylic acid as a main component was used, and a cardiac pacemaker was embedded 2 cm below the surface of the human body model. Next, an adhesive sheet for shielding electromagnetic waves was attached to the surface of the human body model so as to cover the pacemaker (see FIG. 1).

An 800 MHz portable telephone was brought close to a distance of about 2 cm from the adhesive sheet for electromagnetic wave shielding, and it was examined whether or not the pacemaker malfunctioned. ：: No pacing failure was observed. ×: Pacing failure was observed.

<Skin irritation> An adhesive sheet for shielding electromagnetic waves was stuck on the skin surface of the heart of a healthy person for 8 hours, then peeled off, and then stuck on the same skin surface the next day and peeled off for one week. Was. Thereafter, the state of the skin surface attached was determined according to the following criteria. ：: The skin surface was hardly reddish. Δ: The skin surface was partially reddish. ×: The skin surface was partially peeled off, and strong skin irritation such as blisters appeared.

[0037]

[Table 1]

[0038]

The pressure-sensitive adhesive sheet for electromagnetic wave shielding of the present invention has the above-mentioned structure, so that it can be used more easily than conventional shield aprons and clothes, can be shielded securely, and can be adhered to the skin surface. It has very little skin irritation such as metal allergy, and can be used in real life by heart pacemaker wearers with peace of mind.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a usage pattern using one embodiment of an adhesive sheet for electromagnetic wave shielding of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive sheet 2 Elastic sheet 3 Adhesive layer 4 Skin surface 5 Heart pacemaker

Claims (7)

[Claims] 1. A pressure-sensitive adhesive sheet for electromagnetic wave shielding, characterized in that a pressure-sensitive adhesive layer is formed on the other side of a stretchable sheet obtained by laminating a conductive sheet on one side. 2. The conductive sheet is at least one selected from a metal foil, a metal-deposited plastic film, a fabric made of metal fibers, and a metal-coated fabric.
The adhesive sheet for an electromagnetic wave shield according to the above. 3. The pressure-sensitive adhesive sheet for electromagnetic wave shielding according to claim 1, wherein a cut is made in the conductive sheet. 4. The pressure-sensitive adhesive sheet for electromagnetic wave shielding according to claim 1, wherein the size of the stretchable sheet is larger than that of the conductive sheet and protrudes from the periphery of the conductive sheet. 5. The stretchable sheet according to claim 1, wherein the stretchable sheet has air permeability.
The adhesive sheet for an electromagnetic wave shield according to the above. 6. The pressure-sensitive adhesive sheet for electromagnetic wave shielding according to claim 1, wherein the pressure-sensitive adhesive layer is formed by pattern coating. 7. The pressure-sensitive adhesive sheet for electromagnetic wave shielding according to claim 1, wherein the pressure-sensitive adhesive sheet is used by attaching to a skin surface or underwear.