JPH10279892A - Adhesive foam tape and bonding method therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive foam tape which is suitable for bonding a flexible strip member to a curved adherend. SOLUTION: In an adhesive tape contg. a sticky foam layer 3 and a hot-melt adhesive layer 2 arranged at the side facing to the sticky surface of the foam layer 3, a metal substrate 1 capable of generating heat by electromagnetic induction and having a thickness of 5-40 μm is interposed between the foam layer 3 and the adhesive layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive foam tape, and more particularly, to an adhesive foam tape which can be fused by electromagnetic induction. The adhesive foam tape of the present invention is suitable for bonding a flexible member, particularly a weather strip, to an adherend such as a vehicle body or a door. The invention also relates to a bonding method using such an adhesive foam tape.

[0002]

2. Description of the Related Art A weather strip is disposed between a main body having a housing space and an opening communicating with the space, and a lid for opening and closing the opening, and the opening is closed by the lid. It is a member that functions to enhance the airtightness of the accommodation space when the container is closed. For example, as the above-mentioned main body, a body such as a vehicle such as an automobile, an aircraft, and a ship can be specifically mentioned. In the case of these main bodies, a lid used in combination is a door or a door.

A weatherstrip has an end shape extending in a length direction from one end to the other end, or an endless shape similar to the outer peripheral shape of an opening of a door or a body, that is,
It has a closed shape, and usually follows a two-dimensional or three-dimensional curved surface of an outer peripheral edge of an opening of a door or a body, and is used by being fixed to the outer peripheral edge. The weatherstrip itself is usually formed of a flexible material such as rubber, for example, ethylene-propylene-diene terpolymer (EPDM rubber), so that the weatherstrip has good followability to the curved surface of the fixing portion. Also, good surface followability is required. Therefore, as an adhesive material,
Adhesive foam tape is used. Here, the term "adhesive foam tape" refers to a double-sided adhesive tape having adhesive properties on both sides of a foam substrate, wherein an adhesive layer is disposed on the surface of the foam substrate, or the foam substrate itself is adhered. Including those having properties. As such a foam tape, for example, an acrylic foam tape for bonding a weather strip manufactured by Sumitomo 3M Ltd. “(No.) # 4”
232 ".

FIG. 6 is a sectional view of a conventional adhesive foam tape. As shown in FIG. 6, the adhesive foam tape 20 usually has one surface of a foam base material 23 having tackiness derived from the pressure-sensitive adhesive layer 24, and the other surface thereof has a heat-sealing adhesive layer 22 Are laminated. The surface of the pressure-sensitive adhesive layer 24 is protected by a release paper (liner) 25. The heat sealing adhesive layer 22 is made of a thermoplastic resin used as a hot melt adhesive, and its thickness is usually 10 to 200 μm. The layer of the thermoplastic resin having such a thickness does not impair the flexibility of the foam base material, and maintains good curved surface followability of the entire foam tape.

When the weather strip is fixed to an adherend such as an automobile body using the adhesive foam tape, the following procedure is generally performed. First, the heat-fusible adhesive layer is heated (in other words, heat activated) to be in a bondable state, and the heat-sealable adhesive layer is brought into contact with a portion of the weatherstrip facing the adherend, and the heat-sealable adhesive is bonded. The agent layer is sufficiently cooled and the foam tape is adhered to the weatherstrip. Cooling is performed by natural cooling. Next, the release paper is peeled off, the adhesive surface of the foam tape is brought into contact with the surface of a predetermined portion of the adherend, and pressure is applied from the weather strip side to adhere. According to this method, when the bonding portion of the adherend has a curved surface shape, the weather strip is deformed so as to follow the shape so that the foam tape is fully or partially stretched, and sufficient Can be fixed with adhesive strength.

[0006] However, in the bonding method using the conventional adhesive foam tape, it is difficult to accurately position and bond the foam tape to the weather strip. That is, after the foam tape is brought into contact with the weather strip, the foam tape cannot be peeled off and the heat-activated adhesive layer which has been heat-activated again cannot be reattached. This is because the adhesive strength (in other words, peel strength) increases when the heat-sealing adhesive layer comes into contact with the weather strip and reaches a temperature lower than the melting point.

[0007] Further, a method of contacting an adhesive layer having little adhesiveness before heat fusion with an adhesion portion of a weather strip, accurately positioning the adhesive layer, and then heating the adhesive layer with a normal heating device is known. However, it is not practical from the following points. For example, when using an iron as a heating device,
It is necessary to bring an iron into contact with the surface of the release tape of the foam tape. However, release paper, especially plastic release paper (liner) containing polymers such as polyethylene and polypropylene, is damaged by deformation, etc. I can't fulfill it enough. In addition, when heating is performed in an oven, unnecessary heat is applied to the weather strip, and the weather strip is damaged by deformation.

On the other hand, in order to prevent unnecessary heat from being applied to members to be adhered such as a liner and a weather strip, and to sufficiently heat only the heat-sealing adhesive layer, the heat-sealing adhesive layer is directly contacted with the heat-sealing adhesive layer. Using an adhesive tape with a metal substrate in contact,
A method of heating by electromagnetic induction has been attempted. Such an adhesive tape is disclosed, for example, in Japanese Patent Application Laid-Open No. 4-36856.
No. 3 discloses this. This adhesive tape is formed by coating a heat-sealing adhesive layer on both sides of an aluminum foil capable of generating heat by electromagnetic induction. Incidentally, the application of the adhesive tape is, for example, for bonding a floor material having a flat surface.

The adhesive tape disclosed in Japanese Patent Application Laid-Open No. 4-368563 is used as follows. That is, place this adhesive tape between the floor material back surface and the floor surface,
An electromagnetic induction heating device such as an electromagnetic induction iron is actuated from the floor material surface side to activate both heat-sealing adhesive layers, and then the heating device is removed and the adhesive layer is cooled to complete the bonding operation. Let it. This publication does not make any mention of improving the curved surface followability of the adhesive tape.

Further, when producing an adhesive foam tape which can be subjected to electromagnetic induction fusion with reference to the contents disclosed in the above-mentioned JP-A-4-368563, the following problems occur:
A foam tape for bonding a flexible strip member such as a weather strip as described above needs to maintain good curved surface followability as a whole foam tape. However, enclosing a normal metal substrate such as an aluminum foil in the foam tape causes a problem of impairing the curved surface followability of the entire foam tape.

[0011]

That is, an object of the present invention is to have a sufficient curved surface followability as a foam tape for bonding a flexible strip member typified by a weather strip, and the liner and the strip member themselves are heat-sensitive. An object of the present invention is to provide an adhesive foam tape that can be electromagnetically fused and can be accurately positioned and adhered to a strip member while preventing damage such as deformation.

Another object of the present invention is to provide a bonding method using such an adhesive foam tape. Other objects of the present invention will be easily understood from the following detailed description.

[0013]

SUMMARY OF THE INVENTION The present invention provides, in one aspect, an adhesive comprising a tacky foam layer and a heat-sealing adhesive layer disposed on a side of the foam layer opposite the sticky surface. A tape which is capable of generating heat by electromagnetic induction between the foam layer and the heat-sealing adhesive layer, and
An adhesive foam tape characterized in that a metal substrate having a thickness of 0 μm is interposed.

The present invention also relates to a method for bonding a flexible strip member to an adherend using such an adhesive foam tape, comprising the following steps: (a) attaching the flexible member to the adherend after bonding; A step of positioning and arranging the adhesive foam tape at a site to be opposed to the body, and at this time, bringing the surface of the heat-sealing adhesive layer into contact with the strip member; The electromagnetic induction heating device is actuated from the side of the adhesive surface of the foam layer, and the metal substrate is heated as a result of the electromagnetic induction, thereby activating the heat-sealing adhesive layer. (C) contacting the adhesive surface of the foam layer of the adhesive foam tape with a predetermined portion of the adherend, Wherein bonding the adhesive foam tape to the adherend by pressing from, provides a bonding method using an adhesive foam tape characterized in that it comprises a step, to be fixed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to preferred embodiments. In the following description, a weather strip is referred to as a flexible strip member to be adhered to an adherend, but it should be understood that other strip members can be applied in practicing the present invention.

First, the operation of the present invention will be described.
The adhesive foam tape of the present invention comprises (i) a metal substrate capable of generating heat by electromagnetic induction, (ii) a heat-sealing adhesive layer provided on one surface of the metal substrate, and (iii) a metal substrate. And an adhesive foam layer provided on the other surface of the adhesive. With such a configuration, the foam tape can be accurately positioned and adhered to the weather strip by electromagnetic induction heating while preventing the liner and the weather strip from being damaged by thermal deformation or the like. . In addition, since the metal substrate can be broken when the foam tape is completely or partially stretched, it has sufficient curved surface followability as a foam tape for weatherstrip bonding.

In order for the metal substrate to be rupturable when the foam tape is stretched, its thickness is in the range of 5 to 40 μm. If it exceeds 40 μm, it becomes difficult to break and the surface conformability decreases, while if it is less than 5 μm, it breaks before use (that is, during storage or transportation) or during positioning and positioning on the weather strip. In addition, heating by electromagnetic induction cannot be performed sufficiently. The thickness of the metal substrate is preferably 10 to 25 μm, particularly preferably 12 to
It is in the range of 20 μm.

If the thickness of the metal substrate is 25 μm or less,
Breaking during tape extension is particularly easy, but when the thickness of the metal substrate exceeds 25 μm, (A) a plurality of cuts or perforations should be provided along the direction crossing the extension direction of the metal substrate. , And (B) the use of a mesh-shaped metal substrate makes it possible to more reliably break at the time of elongation.

In order to adhere a weather strip to an adherend using the above-mentioned adhesive foam tape according to the present invention,
The following method is preferable. That is, (a) an adhesive foam tape is positioned and arranged at a portion facing the adherend of the weather strip, the surface of the heat-sealing adhesive layer is brought into contact, and (b) a liner for protecting the surface of the foam layer. An electromagnetic induction heating device is actuated from the surface to activate the heat-sealing adhesive layer, the adhesive foam tape is fixed to the weather strip, and (c) the liner is peeled off to form a foam layer on the surface of a predetermined portion of the adherend. This is a bonding method including a step of contacting, pressing from the weather strip side, and bonding the weather strip to the adherend. According to this bonding method, in step (a), the foam tape is accurately positioned on the weather strip, and in step (b), the liner and the weather strip are bonded while preventing damage such as thermal deformation. It is possible.
Further, in the step (c), when the bonding portion of the adherend has a curved shape, the weather strip is deformed so as to follow the shape so that the foam tape is entirely or partially stretched, It can be fixed with sufficient adhesive strength.

Next, the structure of the adhesive foam tape according to the present invention will be described. FIG. 1 shows a preferred embodiment of the present invention.
It is sectional drawing which showed the structure of the adhesive foam tape according to an aspect. The adhesive foam tape 10, as shown,
It has a foam layer having an adhesive surface composed of a foam layer 3 and a pressure-sensitive adhesive layer 4. Although not shown, the foam layer having the adhesive surface may have adhesiveness as described below. On the side of the foam layer 3 facing the adhesive surface, a heat-sealing adhesive layer 2 that can exhibit adhesiveness by heating is laminated. In the illustrated adhesive foam tape 10, the metal substrate 1 capable of generating heat by electromagnetic induction heating and having a thickness of 5 to 40 μm, which is a feature of the present invention, is composed of the foam layer 3 and the heat-sealing adhesive layer. Sandwiched between two. In addition, the surface of the pressure-sensitive adhesive layer 4 associated with the foam layer 3 can be peeled off if necessary, as is commonly done in the art, to protect it from unwanted adhesion. It is covered with a release paper (liner) 5.

Although the adhesive foam tape shown can be advantageously used in various fields because of its excellent properties, it is preferably flexible for adherends having curved surfaces (such as curved parts of the motor vehicle body). Can be used to glue weatherstrips.
Furthermore, the bonding of the weatherstrip can preferably be performed as shown in order in FIGS. Note that, in the illustrated example, the adhesion site of the adherend is shown as a flat surface for easy understanding, and the weather strip is also shown as a flat plate. Step (a) As shown in FIG. 2, an adhesive foam tape 10 is positioned and arranged on a portion of the weather strip 6 that is to face the adherend after bonding, and at this time, the weather strip 6 is thermally fused. The surface of the adhesive layer 2 is brought into contact. Step (b) As shown in FIG. 3, the electromagnetic induction heating device 11 is acted on the adhesive foam tape 10 from the side of the adhesive surface of the foam layer 3 to cause the metal substrate 1 to generate heat as a result of the electromagnetic induction heating. Thus, the heat-sealing adhesive layer 2 is activated, and the adhesive foam tape 10 is fixed to the weather strip 6 via the heat-sealing adhesive layer 2. Step (c) After the fixing of the adhesive foam tape to the weather strip is completed, the liner is peeled off from the adhesive foam tape to prepare for the next step. As shown in FIG.
The adhesive surface of the pressure-sensitive adhesive layer 4 of the foam layer 3 of the adhesive foam tape is brought into contact with a predetermined portion of the adherend 7, and the adhesive foam tape is adhered by applying pressure (see an arrow) from the weather strip 6 side. Adhere to body 7 and fix.

Subsequently, the components of the adhesive foam tape according to the present invention, the method of manufacturing the tape, and the method of bonding using the tape will be described in further detail. Metal substrate: The material of the metal substrate is not particularly limited as long as it can generate heat by electromagnetic induction and can be broken when the foam tape is stretched. Usually aluminum, iron,
This is a foil substantially made of a simple substance of a metal such as copper, silver, and stainless steel, or an alloy thereof. If sufficient heat generation is possible, metal oxides can be used. Further, as long as the effects of the present invention are not impaired, a polymer film containing a powder of a pure metal or metal oxide dispersed therein may be used. The metal substrate may have other shapes as needed.

The metal substrate usually extends continuously along the length of the adhesive foam tape. Of course, if desired, a plurality of cuts, perforations, mesh holes, etc. can be provided. Also, the width of the metal substrate is generally substantially the same as the width of the adhesive foam tape. A preferred metal substrate is an aluminum foil. Hot-melt adhesive layer: The hot-melt adhesive used to form this layer is a heat-activated adhesive, for example, from those that can be used as "hot melt adhesives" or "heat-sensitive adhesives". You can choose any. For example, hot melt adhesives such as polyolefin, polyester, polyurethane, and polyamide are used. For bonding to an adherend made of a polyolefin-based material such as EPDM rubber, a polyolefin-based adhesive is suitable. Examples of the polyolefin adhesive include ethylene-acrylic acid copolymer, ethylene-ethyl acrylate-maleic acid copolymer, ethylene-glycidyl methacrylate copolymer, ethylene-glycidyl methacrylate-vinyl acetate copolymer, ethylene-vinyl acetate An adhesive containing an ethylene-containing copolymer such as a copolymer is preferred. These adhesives
This is because it has both good adhesion to EPDM rubber and sufficient flexibility. Preferred commercially available polyolefin-based adhesives are “(product name) Primacol adhesive resin # 3330” manufactured by Dow Chemical Company and “(product name) manufactured by Sumitomo Chemical Co., Ltd.
Bond First 7B "and the like. Further, as other heat-sealing adhesives, preferably, a polyamide-based adhesive film, “(product name) ELFAN NT14 manufactured by Nippon Matai Co.
0 ".

The melting point of the heat sealing adhesive is usually from 60 to 23.
It is in the range of 0 ° C. In addition, as long as the effects of the present invention are not impaired, the heat sealable adhesive may contain additives such as a plasticizer, a tackifier, a curing agent, a lubricant, a filler, and an oxidation stabilizer. The heat-sealing adhesive layer is a solution containing the heat-sealing adhesive,
The dispersion liquid or the melt liquid is applied to the surface of the metal substrate to be formed. Further, the coating layer provided on the liner may be formed by laminating on one surface of the metal base material. An easy adhesion layer may be provided at the interface between the heat-sealing adhesive layer and the substrate. As a coating device, a usual device such as a roll coater, a knife coater, a bar coater, a die coater or the like can be used. The operation of laminating the adhesive layer on the surface of the metal substrate
After laminating the metal substrate and the adhesive film, this is performed using a pressure roller. The pressure is usually in the range of 1 to 5 kg / cm, and the roller can be heated if necessary. The heating operation is usually performed at a temperature in the range of 60 to 250C. Further, the interface between the metal substrate and the heat-sealing adhesive layer may be subjected to a primer treatment. As a suitable primer, “(product name) Sunmide HT-140” manufactured by Sanwa Chemical Co., Ltd. may be mentioned.

The thickness of the heat-sealing adhesive layer is usually from 10 to 20.
0 μm, preferably 15 to 100 μm. If the thickness is too small, the adhesive performance is reduced, and if it is too large, the curved surface following ability of the adhesive foam tape may not be able to be maintained well. The bonding surface of the heat-sealing adhesive layer is usually protected with a liner. As the liner, a silicone-based liner having a silicone-treated surface, a polyolefin-based liner made of a polymer film containing ultra-low density or low-density polyethylene, or the like can be used. Adhesive foam layer: The adhesive foam layer is formed such that the surface of the foam layer has adhesiveness, and a layer of an adhesive such as a pressure-sensitive adhesive is laminated on the surface of the foam layer. Or the foam layer itself has tackiness.

The foam layer is a layer containing foam (bubbles) inside a matrix made of a resin such as acrylic, neoprene, isoprene, butyl rubber, polyurethane, polyvinyl chloride, and polystyrene. The density of the foam layer is usually in the range of 0.30~0.95g / cm ^3. Further, as the pressure-sensitive adhesive laminated on the surface of the foam layer, an acrylic, rubber-based, silicone-based pressure-sensitive adhesive can be used.
The thickness of the adhesive foam layer is usually from 0.1 to 2.
The range is 0 mm.

The foam layer can be formed by applying a coating solution containing a resin to the surface of the metal substrate and then performing a foam forming treatment. However, a commercially available double-sided adhesive foam tape can be applied to the surface of the metal substrate. It is preferred to laminate. Since a foam layer having a uniform thickness can be prepared in advance as an adhesive foam tape, it is easy to control the thickness of the foam layer. Adhesive foam tape is specifically 3M
Acrylic foam tape "(article number) # 4213"
(The thickness of the foam layer is 0.8mm) ”and“ (No.) #
4212 (foam layer thickness 0.8 mm) "and" (article number) # 4211 (foam layer thickness 1.2 mm) "
And so on.

The operation of laminating the double-sided pressure-sensitive adhesive foam tape on the surface of the metal substrate can be performed using a pressure roller after the metal substrate and the foam tape are stacked. The pressure is
Usually, it is carried out in the range of 1 to 5 kg / cm, and the roller can be heated if necessary. The heating operation is usually 60 to 15
Perform at a temperature of 0 ° C. Further, the interface between the metal substrate and the foam tape can be subjected to a primer treatment. An example of a suitable primer is "Sunmide HT-140" (supra).

The adhesive surface of the foam layer is protected by a liner. As the liner, a silicone-based liner having a silicone-treated surface, a polyolefin-based liner made of a polymer film containing ultra-low density or low-density polyethylene, or the like can be used. Production of adhesive foam tape: The adhesive foam tape of the present invention is produced, for example, as follows. First, the liner on one side of the double-sided pressure-sensitive adhesive foam tape is peeled off, and a metal substrate is laminated on the pressure-sensitive adhesive surface, and then laminated using a pressure roller. Subsequently, a heat-sealing adhesive film (with a liner) is laminated on the surface of the metal substrate on which the foam tape is not laminated, and then heat-laminated using a pressure roller. The heating temperature is usually about the same as or higher than the melting point of the heat sealing adhesive. As described above, the heat-sealing adhesive film can be provided by applying an adhesive coating solution to the surface of the liner. Adhesion Using Adhesive Foam Tape: Adhesion of the first adherend to the second adherend using the adhesive foam tape of the present invention is performed, for example, as follows. First, an adhesive foam tape is positioned and arranged on a portion of the first adherend facing the second adherend, and the surface of the heat-sealing adhesive layer is brought into contact to protect the adhesive surface of the foam layer. An electromagnetic induction heating device is actuated from the surface of the liner to activate the heat-sealing adhesive layer, and the adhesive foam tape is fixed to the first adherend. Subsequently, the liner is peeled off, the foam layer is brought into contact with the surface of a predetermined portion of the second adherend, and pressure is applied from the first adherend to bond the two adherends together. In this method, not only unnecessary heat is not applied to the second adherend, but also unnecessary heat is not applied to the first adherend. Therefore, this method is suitable when the first adherend is a heat-sensitive rubber member such as a weather strip.

After the adhesive foam tape is fixed to the second adherend via the adhesive foam layer, the heat-sealing adhesive layer and the first adherend are fused, and the two The adhesion of the body can be completed. This method is suitable for accurately positioning this member with respect to the first adherend when the second adherend is a smaller member. Further, the adhesive foam tape of the present invention is suitably used for bonding other than the strip member. For example, it is suitable for joining building materials such as a gypsum board and a silicate board (calcium silicate board). Since such building materials are relatively large plate-like materials, it is difficult to use an oven to complete the heat fusion operation. When the adhesive foam tape of the present invention is used, the heat-sealing operation can be completed only by applying the electromagnetic induction heating iron from the surface of the building material. For example, after bonding a foam layer to a scalpel board,
The heat-sealing adhesive layer is disposed on the surface of the gypsum board, and an electromagnetic induction heating iron is acted on from the side of the calcite plate to join them.

As the electromagnetic induction heating device, a device such as a usual electromagnetic induction iron can be used. The electromagnetic induction iron is, for example, “(product name) TESTEM ONE” manufactured by TESTEM. The heating time is not particularly limited, but is usually in the range of 5 to 60 seconds in consideration of workability.

[0032]

The present invention will be described below with reference to examples. It should be understood that this example is not limited to the following example. Example 1 A liner (polyolefin liner) on one side of a double-sided pressure-sensitive adhesive foam tape (double-sided pressure-sensitive acrylic foam tape # 4212; described above) was peeled off, and a 15-μm-thick aluminum foil was laminated on the pressure-sensitive adhesive face, followed by pressing. Lamination was performed using a roller. Subsequently, a heat-sealing adhesive film was stacked on the surface of the aluminum foil foam tape on which the foam tape was not laminated, and then heat-laminated using a pressure roller to produce an adhesive foam tape of this example. As the heat-sealing adhesive film, an ethylene-acrylic acid copolymer (“(product name) Primacol adhesive resin # 3330” manufactured by Dow Chemical Co., Ltd.) was used as a polyolefin-based liner as a hot-melt adhesive layer having a thickness of 75 μm. It was formed on top and used. The temperature during heat lamination was about 180 ° C.

The adhesive foam tape of this example was cut into a size of 12 mm in width × 200 mm in length, and was thermally fused to a plate-like EPDM rubber (thickness: 20 mm, width: 25 mm, length: 250 mm). The EPDM rubber was a foam type manufactured by Hotta. The electromagnetic induction iron used a Testem One (product name; described above) and acted on the liner on the foam layer, and the heating time was 10 seconds. Using this adhesive foam tape with EPDM rubber, the following two evaluation tests were performed. (1) 90-degree peel adhesion test A pressure-sensitive adhesive tape with an EPDM rubber member was pressed on a melamine alkyd-coated steel plate having a width of 20 mm and a length of 250 mm via the adhesive foam layer of the adhesive foam tape, and left at room temperature for 24 hours. After that, the adhesive tape with the EPDM rubber member is applied in a direction of 90 ° with respect to the adhered surface of the coated steel sheet by 300 mm /
It was pulled at a speed of one minute using a tensile tester (not shown). When the adhesive strength when the tape was peeled was measured, the adhesive strength was 2.5 kg × 12 mm (cohesive failure in the foam tape layer). The coated steel plate used in this example was manufactured by Nippon Test Panel Kogyo JIS G314.
1 (1977) coated steel plate (product name "SPCC-SD", U100-aminoalkyd one side,
White). (2) Curved surface followability test As shown in FIG. 5, an EPDM rubber member having an adhesive tape (not shown) adhered to a melamine alkyd coated steel plate 7 having a width of 200 mm and a length of 250 mm was bonded to an adhesive foam tape. The radius of curvature measured at the center position in the width direction of the EPDM rubber member through the adhesive foam layer is 10 cm and 20 cm.
Then, the steel plate 7 was crimped in a plane parallel to the horizontal plane, and the state at that time was observed (an example of R = 20 cm is not shown). The adhesive foam tape of this example could be easily curved and applied in any case of the curvature radius, the adhesion between the adhesive surface and the steel plate was reliable, and the curved surface followability was extremely good. Example 2 The procedure described in Example 1 was repeated. However, in this example, the thickness of the aluminum foil was changed to 25 μm. The obtained adhesive foam tape was evaluated for 90 ° peel adhesion and curved surface followability. The 90 ° peel adhesive strength was 2.5 kg / 12 mm (cohesive failure in the foam tape layer). In addition, regarding the curved surface followability, the curved surface followability was evaluated as good because it could be easily curved and attached to the coated steel plate. Small undulations occurred at the interface with the steel sheet, and the adhesion was slightly reduced. Comparative Example 1 The method described in Example 1 was repeated. However, in this example, the thickness of the aluminum foil was changed to 50 μm for comparison. The obtained adhesive foam tape was evaluated for 90 ° peel adhesion and curved surface followability. 90 degree peel adhesion is 3.0kg
/ 12 mm (cohesive failure in the foam tape layer).
However, due to the rigidity of the tape, the adhesive foam tape of the present example could not be bent at a radius of curvature of 10 to 20 cm and attached to the coated steel sheet, and the curved surface followability was poor. This is because the aluminum foil is difficult to break when the foam tape is stretched.

[0034]

As can be understood from the above description, according to the present invention, it is possible to adhere to the weather strip while accurately positioning the liner and preventing the liner and the weather strip from being damaged by thermal deformation or the like. An adhesive foam tape having sufficient curved surface followability for use in weatherstrip bonding can be provided.

Further, when the adhesive foam tape of the present invention is used, the electromagnetic induction heating may be performed from the liner surface of the pressure-sensitive adhesive of the tape, or if the adherend is relatively thin, the material to be heat-sealed may be used. Even if it is performed from the surface of the body, the metal foil layer can generate heat in a short time, and the heat-sealing adhesive layer can be easily melted. In addition, since heating can be started after the tape is positioned and temporarily fixed to the adherend, the positioning property and the bonding reliability during the sticking operation are excellent. further,
Since a foam layer with excellent curved surface followability and strain absorption properties is used, the thickness of the metal substrate, for example, a metal foil, is regulated so that it breaks when stretched, so that it can be easily attached to a curved surface having a small curvature. it can. Therefore, the tape of the present invention is suitable for bonding a flexible adherend such as weatherstrip rubber for automobiles to a three-dimensional curved surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an adhesive foam tape according to a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a first step for realizing a usage example of the adhesive tape of FIG. 1;

FIG. 3 is a cross-sectional view showing a second step for realizing a usage example of the adhesive tape of FIG. 1;

FIG. 4 is a cross-sectional view illustrating a third step for realizing a usage example of the adhesive tape of FIG. 1;

FIG. 5 is a cross-sectional view showing an outline of a test method used for evaluating a curved surface followability.

FIG. 6 is a cross-sectional view showing one example of a conventional adhesive foam tape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal base material 2 ... Heat fusion adhesive layer 3 ... Foam layer 4 ... Pressure sensitive adhesive layer 5 ... Release paper (liner) 6 ... Weather strip 7 ... Adherend 10 ... Adhesive foam tape 11 ... Electromagnetic induction heating apparatus

Claims (2)

[Claims] 1. An adhesive tape comprising: an adhesive foam layer; and a heat-sealing adhesive layer disposed on a side of the foam layer opposite to an adhesive surface, wherein the heat-sealing adhesive layer includes the heat-sealing adhesive layer. In the middle of the agent layer, heat can be generated by electromagnetic induction and 5
An adhesive foam tape, wherein a metal base material having a thickness of ４０40 μm is interposed. 2. A method for adhering a flexible strip member to an adherend using the adhesive foam tape according to claim 1, comprising the following steps: (a) attaching the flexible member to the adherend after adhering; A step of positioning and positioning the adhesive foam tape at a portion to be opposed to the adherend, and at this time, bringing the surface of the heat-sealing adhesive layer into contact with the strip member; (b) the adhesive foam tape The electromagnetic induction heating device is acted on from the side of the adhesive surface of the foam layer to generate heat as a result of the electromagnetic induction, thereby activating the heat-sealing adhesive layer. And (c) contacting the adhesive surface of the foam layer of the adhesive foam tape with a predetermined portion of the adherend, from the side of the strip member. Adhering the adhesive foam tape to the adherend by applying pressure, and fixing the adherend to the adherend.