JP6864471B2 - Manufacturing method of heat-adhesive tape and heat-adhesive tape - Google Patents

Description

The present invention relates to a heat adhesive tape or the like. More specifically, the present invention relates to a heat-adhesive tape or the like to be attached to a glass cloth or the like.

Conventionally, there has been known a heat-adhesive tape in which an adhesive layer is hardened by heat-bonding to bond adherends. This heat-adhesive tape is composed of, for example, a base material and adhesive layers provided on both sides of the base material, and an adherend such as a glass cloth is heat-bonded to each of the two adhesive layers to be bonded (splice). ), And is used for applications such as joining adherends.

In Patent Document 1, a carboxyl group-containing acrylic polymer 100 composed of (a) C1-12 (meth) acrylic acid ester, (b) acrylonitrile or metaacrylonitrile, and (c) a carboxyl group-containing copolymerizable vinyl monomer and the like. A heat-sensitive adhesive composition and an adhesive sheet containing 25 to 100 parts by weight of a phenol resin, 5 to 50 parts by weight of an epoxy resin, and 1 to 20 parts by weight of a reaction inhibitor are disclosed.

Japanese Unexamined Patent Publication No. 5-51569

The heat-adhesive tape is required to have sufficient adhesive strength to the adherend and to be less likely to be peeled off or cut from the heat-adhesive tape when the adherend is pulled. Therefore, it is required to have sufficient strength against the shearing force which is a force in the direction along the surface of the heat-adhesive tape. Further, in recent years, it is also required to have strength against a peeling force which is a force other than the direction along the surface of the heat-adhesive tape.
However, it cannot be said that the conventional heat-adhesive tape has sufficient strength against the peeling force.
In particular, a double-sided thermal adhesive tape having a base material has sufficient strength against peeling force because it peels off at the interface between the adhesive layer and the base material or the base material itself causes layer cracking. Sometimes I couldn't do it.
An object of the present invention is to provide a heat-adhesive tape or the like based on a non-woven fabric, which has sufficient strength not only for shearing force but also for peeling force.

The heat-adhesive tape of the present invention is a heat-adhesive tape that joins adherends by heat-bonding, and has a grain size of 5 g / m ² or more and 40 g / m ² or less , a thickness of 30 μm or more and 120 μm or less, and a density. A base material made of a non-woven fabric of 0.17 g / cm ³ or more and 0.34 g / cm ³ or less , and an acrylic nitrile-butadiene rubber having a branched structure and a phenol resin provided on the surface side of one or the other of the base material. It is characterized in that it is a heat-adhesive tape comprising an adhesive layer containing a phenol resin cross-linking agent and an overall thickness of 100 μm or more and 250 μm or less.

Here, the mass ratio of the acrylonitrile-butadiene rubber having a branched structure and the phenol resin is preferably in the range of 100/80 to 100/200.

The acrylic nitrile-butadiene rubber having a branched structure is further represented by the general formula (1) after the double bond of butadiene of the linear acrylonitrile-butadiene rubber represented by the following general formula (1) is cleaved. Structures can be combined.

In the general formula (1), m and n are integers of 1 or more.

The heat-adhesive tape of the present invention is a heat-adhesive tape that joins adherends by heat-bonding, and has a grain size of 5 g / m ² or more and 40 g / m ² or less, a thickness of 30 μm or more and 120 μm or less, and a density. Acrylic nitrile-butadiene rubber having a branched structure and phenol provided on the surface side of one and the other of a base material made of a non-woven fabric having a value of 0.17 g / cm ³ or more and 0.34 g / cm ³ or less. An adhesive layer containing a resin and a phenolic resin cross-linking agent, having an overall thickness of 100 μm or more and 250 μm or less, and an adhesive layer provided on one surface side of the base material and the other surface side of the base material. The adhesive layer provided in the non-woven fabric is a heat-adhesive tape that is bonded through an opening of the non-woven fabric.

Further, in the method for producing a heat adhesive tape of the present invention, the release liner and the amount of grain are 5 g / m ² or more and 40 g / m ² or less , the thickness is 30 μm or more and 120 μm or less, and the density is 0.17 g / cm ³ or more and 0.34 g /. A release liner / base material preparation step for preparing a base material made of a non-woven fabric of cm ³ or less , and an adhesive layer solution preparation step for preparing a solution for an adhesive layer containing a branched acrylic nitrile-butadiene rubber, a phenol resin, and a phenol resin cross-linking agent. The first adhesive layer forming step of applying the adhesive layer solution to the release liner to form the first adhesive layer, and the first adhesive layer formed on the release liner on one surface side of the base material. The total thickness excluding the release liner is 100 μm or more and 250 μm, which includes a bonding step of bonding and a bonding layer forming step of applying a solution for an adhesive layer to the other surface side of the base material to form an adhesive layer. It is characterized by the following.

According to the present invention, it is possible to provide a heat-adhesive tape or the like based on a non-woven fabric, which has sufficient strength not only for shearing force but also for peeling force.

It is sectional drawing which showed about the thermal adhesive tape to which this embodiment is applied. It is a flowchart explaining the manufacturing method of the heat-bonding tape. (A) to (b) are diagrams explaining the shearing force and the peeling force.

Hereinafter, embodiments for carrying out the present invention will be described in detail. The present invention is not limited to the following embodiments. In addition, it can be modified in various ways within the scope of the gist. Further, the drawings used are for explaining the present embodiment and do not represent the actual size.

The heat-adhesive tape is required to have sufficient strength against shearing force and peeling force after being bonded to the adherend.
3 (a) to 3 (b) are views for explaining the shearing force and the peeling force.
Of these, FIG. 3A shows a case where a shearing force is applied to the heat-adhesive tape 1 in a state of being bonded to the adherend T.

Here, a case where a tensile force F1 is applied to the adherend T in a direction parallel to the surface of the heat-adhesive tape 1 is shown. In this case, an upward force is applied to the surface side of the heat adhesive tape 1 on the right side in the drawing. Further, a downward force is applied to the front surface side of the heat adhesive tape 1 on the left side in the drawing. That is, forces in opposite directions act on the two surfaces of the heat-bonding tape 1, and as a result, a shearing force acts on the heat-bonding tape 1.

Further, FIG. 3B shows a case where a peeling force is applied to the heat-adhesive tape 1 in a state of being bonded to the adherend T.
Here, a case where a tensile force F2 is applied to the surface of the heat-adhesive tape 1 in the vertical direction with respect to the adherend T is shown. In this case, an upward force is applied to the right end of the upper surface of the heat adhesive tape 1 in the drawing. Further, a downward force is applied to the right end of the lower surface of the heat adhesive tape 1 in the drawing. That is, on the surface of the heat-bonding tape 1, a peeling force, which is a force for peeling the heat-bonding tape 1 and the adherend T, acts. The method of testing the strength against peeling force by this method is called a T-shaped peeling strength test.

Conventional heat-adhesive tapes often have sufficient strength against the shearing force shown in FIG. 3 (a). However, the peeling force shown in FIG. 3B may be insufficient in strength as described above.
Therefore, in the present embodiment, the heat-adhesive tape 1 is configured as shown below, and sufficient strength is given to the heat-adhesive tape 1 not only for shearing force but also for peeling force.

<Explanation of the overall configuration of the heat adhesive tape>
FIG. 1 is a cross-sectional view showing a heat adhesive tape 1 to which the present embodiment is applied.
The illustrated heat-adhesive tape 1 includes a base material 2 and an adhesive layer 3 provided on one and the other surface sides of the base material 2. Hereinafter, for convenience of explanation, the upper adhesive layer 3 on one surface side in the drawing is referred to as an adhesive layer 3a (first adhesive layer), and the lower adhesive layer 3 on the other surface side in the drawing is referred to as an adhesive layer. It may be called 3b (second adhesive layer). Although not shown, in FIG. 1, a release liner or the like may be provided on the surface side of the adhesive layer 3 opposite to the base material 2.

The heat-adhesive tape 1 is heat-bonded to bond the adherends. Specifically, for example, when the adherend is a glass cloth, in the manufacturing process for manufacturing the glass cloth, the ends of the roll-shaped raw fabric wound from the long glass cloth are joined to each other. Used for applications. At this time, the heat-adhesive tape 1 is sandwiched between the ends of the roll-shaped raw fabric, and this portion is pressed while heating. As a result, the adhesive layer 3 is cured, and the ends of the roll-shaped raw fabrics are joined to each other via the heat-bonding tape 1. That is, the heat-bonding tape 1 of the present embodiment is different from the pressure-sensitive adhesive tape in which the adherends cannot be bonded without heat-bonding, and the adherends are bonded by adhesive force.

The heat-bonding tape 1 of the present embodiment preferably has an overall thickness of 100 μm or more and 250 μm or less. If the thickness of the heat-adhesive tape 1 is less than 100 μm, it becomes difficult to maintain the strength against shearing force and peeling force. Further, if the thickness of the heat-adhesive tape 1 exceeds 250 μm, the diameter of the roll becomes excessively large or wrinkles are likely to occur when the heat-adhesive tape 1 is wound to form a roll-shaped product. In addition, the solvent tends to remain in the manufacturing process of the heat-adhesive tape 1, and the surface of the adhesive layer 3 tends to have irregularities and the appearance tends to deteriorate.

<Base material>
The base material 2 serves as a support for forming the adhesive layer 3. The base material 2 is required to have a function of ensuring the mechanical strength of the entire heat-adhesive tape 1, and can flexibly change its shape by following the adherend to which the heat-adhesive tape 1 is attached. Function is required.

In the present embodiment, the base material 2 is made of a non-woven fabric. That is, the base material 2 is a sheet-like material in which the fibers constituting the non-woven fabric are entwined without being woven. In the present embodiment, the fibers constituting the non-woven fabric are not particularly limited. For example, polyester fiber, rayon fiber, polyethylene fiber, polypropylene fiber, polyolefin fiber, aramid fiber, glass fiber, nylon fiber and the like can be used.

Further, since the base material 2 is a non-woven fabric, it has a large number of openings H between the fibers. Therefore, as will be described in detail later, when the adhesive layer 3 is formed on the base material 2, the components constituting the adhesive layer 3 invade the opening H. As a result, as shown in the drawing, the adhesive layer 3a provided on one surface side of the base material 2 and the adhesive layer 3b provided on the other surface side of the base material 2 pass through the opening H of the non-woven fabric. They are joined to form a joint 3c in the opening H.
In the present embodiment, by generating the joint portion 3c, the adhesion of the base material 2 to the adhesive layer 3 can be improved, and the layer cracking of the base material 2 itself can be prevented, which the adhesive layer 3 originally has. It becomes possible to fully develop the cohesive force. Further, in combination with the effect that the heat-adhesive tape 1 becomes difficult to stretch, the heat-adhesive tape 1 can be obtained to have sufficient strength not only for shearing force but also for peeling force. In the figure, the joints 3c are formed in all of the openings H, but it is not always necessary, and it is sufficient that the joints 3c are formed in some of the openings H.

When the adhesive layer 3 is formed on the base material 2, the basis weight of the non-woven fabric ^{is preferably 40 g / m 2} or less in order for the components constituting the adhesive layer 3 to penetrate into the opening H. If the basis weight of the non-woven fabric ^{exceeds 40 g / m 2} , the size of the opening H becomes too small, and the components constituting the adhesive layer 3 are less likely to penetrate into the opening H. As a result, the joint portion 3c is less likely to be formed, and sufficient strength cannot be obtained with respect to the peeling force. Further, the basis weight of the non-woven fabric is more preferably ^{5 g / m 2 or more.} If the basis weight of the non-woven fabric is ^{less than 5 g / m 2} , the transportability of the base material 2 deteriorates, and the work of adhering the base material 2 to the adhesive layer 3a (first adhesive layer) becomes difficult. In addition, the strength of the heat-adhesive tape 1 after the adhesive layer 3 is formed on the base material 2 may decrease.
The thickness of the base material 2 is preferably 30 μm or more and 120 μm or less.

<Adhesive layer>
The adhesive layer 3 is a functional layer that hardens by heating and exerts an adhesive force between the heat-adhesive tape 1 and the adherend by being pressurized at that time.
In the present embodiment, the adhesive layer 3 contains an acrylonitrile-butadiene rubber having a branched structure, a phenol resin, and a phenol resin cross-linking agent.

The acrylonitrile-butadiene rubber having the above-mentioned branched structure can impart appropriate flexibility to the adhesive layer 3 and at the same time impart extremely high cohesive force. The acrylonitrile-butadiene rubber having a branched structure used in the present embodiment is classified as a hot rubber produced at a polymerization temperature of 25 ° C. to 50 ° C. among the acrylonitrile-butadiene rubbers, for example. It is represented by the following two equations.
Further, the general formula (1) of the following three formulas is a structural formula of a linear acrylonitrile-butadiene rubber. Here, m and n are integers of 1 or more. The acrylonitrile-butadiene rubber having a branched structure represented by the formula 2 is a rubber in which the double bond of butadiene in the general formula (1) is cleaved and the structure represented by the general formula (1) is further bonded thereto. Is. That is, each line represented by a curve in the formula 2 has a structure represented by the general formula (1).

The weight average molecular weight (Mw) of the acrylonitrile-butadiene rubber having a branched structure is preferably in the range of 200,000 to 400,000, for example. The amount of acrylonitrile in the acrylonitrile-butadiene rubber is preferably in the range of, for example, 25% by mass to 42% by mass.
When a linear acrylonitrile-butadiene rubber is used, the strength against the peeling force may not always be large even if the heat-adhesive tape 1 can be provided with sufficient strength against the shearing force. In the present embodiment, by using the acrylonitrile-butadiene rubber having a branched structure, the entanglement between the molecules based on the branch is increased and the cohesive force is increased as compared with the case where the linear acrylonitrile-butadiene rubber is used. Is greatly improved. As a result, the strength of the heat-adhesive tape 1 can be further improved with respect to the peeling force.

The phenol resin imparts thermosetting, heat resistance, and adhesiveness to the adhesive layer 3. The phenol resin used in the present embodiment is not particularly limited, but a novolak resin obtained by synthesizing phenols and formaldehyde under an acid catalyst can be preferably used. Examples of phenols include phenol, cresol, xylenol, alkylphenol, halogenated phenol, arylphenol, aminophenol, nitrophenol, bisphenol A, polyhydric phenol, and derivatives thereof. In addition, these can be used alone or in combination of two or more.

The mass ratio of the acrylonitrile-butadiene rubber having a branched structure and the phenol resin is preferably in the range of 100/80 (100:80) to 100/200 (100: 200). When the mass ratio is out of this range and the content of the phenol resin is relatively low (when the mass ratio of the phenol resin is less than 80 with respect to 100 of acrylonitrile-butadiene rubber having a branched structure), the adhesive strength Is reduced, and the heat-adhesive tape 1 becomes less likely to exhibit strength against shearing force and peeling force. When the mass ratio is out of this range and the content of the phenol resin is relatively too large (when the mass ratio of the phenol resin exceeds 200 with respect to 100 of acrylonitrile-butadiene rubber having a branched structure), heat pressure bonding is performed. The hardness of the adhesive layer 3 after that becomes too large, and even when the adhesive layer 3 has sufficient strength against the shearing force, it becomes difficult to exert the strength against the peeling force.

The phenol resin cross-linking agent promotes cross-linking of the phenol resin when the heat-adhesive tape 1 is heated, and cures the phenol resin in a shorter time. The phenol resin cross-linking agent is also called a phenol resin cross-linking accelerator or a curing agent. Examples of the phenol resin cross-linking agent include hexamethylenetetramine (hexamine), methylolmelamine, and methylolurea. In addition, these can be used alone or in combination of two or more. Of these, hexamethylenetetramine (hexamine) can be preferably used in the present embodiment.

The adhesive layer 3 is provided with a thickener for improving the coatability when applying the adhesive layer solution, which is a coating liquid described later, and a defoaming agent for suppressing foaming and suppressing roughness of the appearance. It may also be included.

<Manufacturing method of heat adhesive tape>
FIG. 2 is a flowchart illustrating a method for manufacturing the heat-adhesive tape 1.
First, a base material made of a release liner and a non-woven fabric having a basis weight of 40 g / m ² or less is prepared (step 101: release liner / base material preparation step).

Next, a solution for the adhesive layer for applying the adhesive layer 3 is prepared (step 102: a solution preparation step for the adhesive layer). This adhesive layer solution contains the above-mentioned acrylonitrile-butadiene rubber having a branched structure, a phenol resin, and a phenol resin cross-linking agent, and these are added to a predetermined solvent and then stirred.

Then, the adhesive layer solution is applied to the release liner to form a coating film (step 103).
Further, by drying the coating film, an adhesive layer 3a (first adhesive layer) is formed on the release liner (step 104). The steps 103 to 104 can be regarded as a first adhesive layer forming step of applying the adhesive layer solution to the release liner to form the first adhesive layer.
Next, one surface side of the base material 2 is attached (transferred) to the adhesive layer 3a (first adhesive layer) formed on the release liner. (Step 105: Laminating process)

Next, the adhesive layer solution is applied to the other surface side of the base material 2 to form a coating film on the other surface side of the base material 2 (step 106). At this time, as described with reference to FIG. 1, the adhesive layer solution penetrates into the opening H of the non-woven fabric constituting the base material 2.
Further, by drying the coating film, an adhesive layer 3b (second adhesive layer) is formed on the other surface side of the base material 2 (step 107). It can be understood that the steps 106 to 107 are the second adhesive layer forming steps of applying the adhesive layer solution to the other surface side of the base material 2 to form the second adhesive layer. ..

By the steps 103 to 107, the adhesive layers 3 (adhesive layer 3a, adhesive layer 3b) are formed on both surfaces of the base material 2, and as described in FIG. 1, the joint portion 3c is further formed in the opening H of the non-woven fabric. It is formed.
Here, when the adhesive layer 3b is formed on the base material 2, the adhesive layer 3b is formed directly on the base material 2, but after forming the adhesive layer 3b on another release liner, the adhesive layer 3b is transferred to the base material 2. You may. Further, the adhesive layer solution may be applied to both surfaces of the base material 2 at the same time to form the adhesive layer 3a and the adhesive layer 3b at the same time.
By the above steps, the total thickness is set to 100 μm or more and 250 μm or less, and the heat-adhesive tape 1 of the present embodiment can be manufactured.

According to the form described in detail above, by using the non-woven fabric as the base material 2, a joint portion 3c is formed in the opening H, which has sufficient strength not only for shearing force but also for peeling force. The heat adhesive tape 1 can be provided. Further, by including the acrylic nitrile-butadiene rubber having a branched structure in the adhesive layer 3, the strength against the peeling force can be further improved.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

The heat-adhesive tape 1 shown in FIG. 1 was produced and evaluated. The implementation conditions and evaluation results are shown in Table 1 below.
[Preparation of heat-adhesive tape 1]
(Example 1)
In this example, a non-woven fabric having a basis weight of 5 g / m ² and a thickness of 30 μm was used as the base material 2. Further, as the fiber of this non-woven fabric, one made of polyester having a specific gravity of 1.38 was used. Specifically, Milife T05 (registered trademark) manufactured by JX ANCI Co., Ltd. was used.

Then, an adhesive layer 3a was formed on one surface side of the base material 2 as follows.
First, ethyl acetate is used as a solvent, and acrylic nitrile-butadiene rubber having a branched structure (described as "NBR" in Table 1), phenol resin, and phenol resin cross-linking agent are added to this solvent and dissolved by stirring to dissolve the solid content. A solution for an adhesive layer having a concentration of 40% by mass was prepared. At this time, as the acrylonitrile-butadiene rubber having a branched structure, Nipol (registered trademark) 1001LG manufactured by Nippon Zeon Corporation was used. As the phenol resin, Tamanol (registered trademark) 531 manufactured by Arakawa Chemical Industry Co., Ltd. was used. In addition, Tamanol 531 contains 9 parts by mass of hexamethylenetetramine (hexamine) as a phenol resin cross-linking agent. The mass ratio of the acrylonitrile-butadiene rubber having a branched structure and the phenol resin was set to 100/120.

Then, the adhesive layer solution was applied on the release liner and dried to form the adhesive layer 3a.
Next, the base material 2 was attached to the adhesive layer 3a.
Subsequently, the adhesive layer solution was applied to the other surface side of the base material 2 and dried to form the adhesive layer 3b. Then, the thickness of the entire heat-adhesive tape 1 was set to 140 μm.
The heat-adhesive tape 1 of this example was produced by the above steps.

(Examples 2 to 9)
A heat-adhesive tape 1 was produced in the same manner as in Example 1 except that changes were made to Example 1 as shown in Table 1.
That is, in Examples 2 to 4, as the non-woven fabric used as the base material 2, a non-woven fabric having a different basis weight than that of Example 1 was used. Specifically, the brand of Milife manufactured by JX ANCI Co., Ltd. was changed. Further, in Example 5, the thickness of the heat-adhesive tape 1 was set to the lower limit value of 100 μm. Further, in Example 6, the thickness of the heat-adhesive tape 1 was set to the upper limit of 250 μm. Further, in Examples 7 to 8, the mass ratio of the acrylonitrile-butadiene rubber having a branched structure and the phenol resin was changed from that of Example 1. Then, in Example 9, the fiber of the non-woven fabric was changed from polyester to rayon having a specific gravity of 1.5.

(Comparative Examples 1 to 6)
A heat-adhesive tape 1 was produced in the same manner as in Example 1 except that changes were made to Example 1 as shown in Table 1.
That is, in Comparative Example 1, the thickness of the heat-adhesive tape was set to 80 μm, which is equal to or less than the lower limit. Further, in Comparative Example 2, the thickness of the heat-adhesive tape was set to 300 μm, which is equal to or more than the upper limit value. Further, in Comparative Example 3, the acrylonitrile-butadiene rubber having a branched structure was not used. Further, in Comparative Example 4, no phenol resin was used. In Comparative Example 5, the acrylonitrile-butadiene rubber having a branched structure was not used, and instead, the linear acrylonitrile-butadiene rubber represented by the above general formula (2) (Nipol 1041 manufactured by Nippon Zeon Corporation) was used. It was used. Further, in Comparative Example 6, the non-woven fabric used as the base material ² was changed to 60 g / m 2, which is equal to or higher than the upper limit.

〔Evaluation method〕
The appearance of the heat-adhesive tapes of Examples 1 to 9 and Comparative Examples 1 to 6 was visually evaluated.

Further, the adhesive strength of the heat-adhesive tapes of Examples 1 to 9 and Comparative Examples 1 to 6 was evaluated. At this time, a shearing force and a peeling force as shown in FIG. 3 were applied, and the adhesive force against the shearing force was evaluated.

Specifically, prepared two glass cloth, sandwiching the thermal adhesive tape in this two glass cloth, 170 ° C., at a pressure of ^{1.47 × 10 5 N / m 2} , subjected to pressing for 10 seconds, Two glass cloths were joined with heat adhesive tape. The thickness of the glass cloth used for the evaluation is 0.17 mm, and the breaking strength is about 300 N / 10 mm.

Then, in the state shown in FIG. 3A, the two glass cloths of the adherend T are pulled at a tensile speed of 200 mm / min, and under this condition, before peeling occurs between the glass cloth and the heat adhesive tape. The shearing force was evaluated based on whether or not the glass cloth was broken. That is, the shearing force is passed at this time because it means that the shearing force is larger than the breaking strength of the glass cloth when the glass cloth is broken before the peeling occurs between the glass cloth and the heat-bonding tape. It was evaluated as a failure when peeling occurred.

Further, in the state shown in FIG. 3B, a tensile force is applied to the two glass cloths of the adherend T, and the force when peeling occurs between the glass cloth and the heat adhesive tape is used as a base. The strength against the peeling force was calculated. Regarding the peel force, it was evaluated that if it was 3N / 10 mm or more, it passed, and if it was less than 3N / 10 mm, it failed.

〔Evaluation results〕
The evaluation results are shown in Table 1.
The heat-adhesive tapes 1 of Examples 1 to 9 all passed the shearing force and the peeling force.

On the other hand, in Comparative Example 1, the thickness of the heat-adhesive tape was too thin, and the shearing force was rejected. Further, in Comparative Example 2, the thickness of the heat-adhesive tape was too thick, and the surface of the heat-adhesive tape was wavy. Further, in Comparative Example 3, the heat-adhesive tape could not be manufactured by not using the acrylonitrile-butadiene rubber having a branched structure. Then, in Comparative Example 4, both the shearing force and the peeling force were rejected by not using the phenol resin. Further, in Comparative Example 5, the peeling force was rejected by using the linear acrylonitrile-butadiene rubber. Then, in Comparative Example 6, since the basis weight was too large, the components constituting the adhesive layer became difficult to penetrate into the opening, and the peeling force was rejected.

From the results of Examples 1 to 9 and Comparative Examples 1 to 6, it was confirmed that the basis weight of the non-woven fabric used for the base material 2 and the thickness of the heat-adhesive tape 1 need to be within the above-mentioned ranges.

1 ... Thermal adhesive tape, 2 ... Base material, 3, 3a, 3b ... Adhesive layer, 3c ... Joint, H ... Opening

Claims (5)

A heat-adhesive tape that joins adherends by heat-bonding.
A substrate made of a non-woven fabric having a basis weight of 5 g / m ² or more and 40 g / m ² or less , a thickness of 30 μm or more and 120 μm or less, and a density of 0.17 g / cm ³ or more and 0.34 g / cm ³ or less.
An adhesive layer containing acrylonitrile-butadiene rubber having a branched structure, a phenol resin, and a phenol resin cross-linking agent provided on the surface side of one of the substrates and the other.
With
A heat-adhesive tape having an overall thickness of 100 μm or more and 250 μm or less. The heat-adhesive tape according to claim 1, wherein the mass ratio of the acrylonitrile-butadiene rubber having a branched structure and the phenol resin is in the range of 100/80 to 100/200. The acrylic nitrile-butadiene rubber having the branched structure is represented by the general formula (1) after the double bond of butadiene of the linear acrylonitrile-butadiene rubber represented by the following general formula (1) is cleaved. The heat-adhesive tape according to claim 1 or 2, wherein the structures are bonded to each other.

(In the general formula (1), m and n are integers of 1 or more.) A heat-adhesive tape that joins adherends by heat-bonding.
A substrate made of a non-woven fabric having a basis weight of 5 g / m ² or more and 40 g / m ² or less, a thickness of 30 μm or more and 120 μm or less, and a density of 0.17 g / cm ³ or more and 0.34 g / cm ^{3 or less.}
An adhesive layer containing acrylonitrile-butadiene rubber having a branched structure, a phenol resin, and a phenol resin cross-linking agent provided on the surface side of one of the substrates and the other.
With
The total thickness is 100 μm or more and 250 μm or less.
A thermal adhesive tape in which an adhesive layer provided on one surface side of the base material and an adhesive layer provided on the other surface side of the base material are bonded through an opening of the non-woven fabric. Prepare a peeling liner and a substrate made of a non-woven fabric having a basis weight of 5 g / m ² or more and 40 g / m ² or less , a thickness of 30 μm or more and 120 μm or less, and a density of 0.17 g / cm ³ or more and 0.34 g / cm ³ or less. Peeling liner / base material preparation process and
An adhesive layer solution preparation step for preparing an adhesive layer solution containing a branched acrylonitrile-butadiene rubber, a phenol resin, and a phenol resin cross-linking agent.
The first adhesive layer forming step of applying the adhesive layer solution to the release liner to form the first adhesive layer, and
A bonding step of bonding one surface side of the base material to the first adhesive layer formed on the release liner, and a bonding step.
A second adhesive layer forming step of applying the adhesive layer solution to the other surface side of the base material to form a second adhesive layer,
Including
A method for producing a heat-adhesive tape having a total thickness excluding the release liner of 100 μm or more and 250 μm or less.

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