WO2017091965A1 - Structural adhesive tape - Google Patents

Abstract

A structural adhesive tape (1), which is used for being adhered to an adhered object (2); the dyne value of the outer surface of the structural adhesive tape (1) opposite to the adhered object (2) is 20 dyn/cm to 28 dyn/cm. The structural adhesive tape (1) comprises: an adhesive layer (11), which is used for being adhered to an adhered object (2); and a substrate (12), wherein one surface of the substrate (12) is adhered to the adhesive layer (11), and the other surface of the substrate (12) itself is used as an outer surface of the structural adhesive tape opposite to the adhered object (2), or the other surface of the substrate (12) is surface-treated and the surface-treated surface is used as an outer surface of the structural adhesive tape (1) opposite to the adhered object (2). The structural adhesive tape can enhance the utilization rate of active substances, avoid the waste of active substances, while the battery's energy density, rapid charge and rapid discharge and heat dissipation performances are enhanced.

Description

Structural adhesive tape Technical field

The invention relates to the field of adhesive tape, in particular to a structural adhesive tape.

Background technique

At present, before the pole piece coating of the lithium ion battery, it is necessary to reserve the position of the tab on the current collector to ensure that the welding position of the tab is the empty foil area of the current collector layer of the current collector. In the prior art, conventional structural adhesive tape is added at the position of the ear before coating, and the adhesive surface corresponds to an empty foil area. After the coating operation is completed, the adhesive paper is removed to reserve a position for the ear. In the coating process, the active material layer is covered on the empty foil area and the adhesive tape, and then two temperature zones are set in the drying tunnel in the drying process, wherein the former temperature zone is the dry temperature zone of the active material layer, and the latter The temperature zone is the heated stripping temperature zone of the adhesive tape, and the active material layer is dried, and the adhesive tape is peeled off by heat, thereby achieving the purpose of leaving an empty foil zone in the active material layer.

However, the use of the conventional structural adhesive paper has the following problem: Referring to FIG. 13, since the application of the active material layer 3' belongs to the quantitative coating, the structural adhesive paper 1 occupies a portion of the active material layer 3, resulting in the structural adhesive tape 1 The active material layer 3' at the edge forms a projection with a certain height difference. When the structural adhesive paper 1 is peeled off by the heat curl, the protrusion at the peeling edge cannot be eliminated, and in the subsequent rolling process, the current collector 2' at the protrusion may be subjected to excessive shearing force, causing the foil to become brittle, or even A break occurred and the process did not work properly. Further, the thickness of the active material layer 3' at the edge of the peeling of the conventional structural adhesive paper 1' is larger than the thickness of the active material layer 3' in the normal region, resulting in occurrence of breakage of the tape in the subsequent rolling process.

Summary of the invention

In view of the problems in the prior art, it is an object of the present invention to provide a structural adhesive tape which eliminates the protrusion of the active material layer at the edge of the structural adhesive tape.

Another object of the present invention is to provide a structural adhesive tape which can improve the utilization rate of the active material, avoid waste of the active material, and at the same time improve the energy density, fast charge and release, and heat dissipation performance of the battery.

In order to achieve the above object, in one aspect of the invention, the present invention provides a structural adhesive sheet for sticking to an object to be bonded. The outer surface of the structural adhesive paper opposite to the object to be bonded has a Dyne value of 20 dyn/cm to 28 dyn/cm. The structural adhesive tape comprises: an adhesive layer for attaching to the object to be bonded; and a substrate, one surface of the substrate is adhered to the adhesive layer, and the other surface of the substrate itself serves as the structure The outer surface of the adhesive paper opposite the object to be bonded, or the other surface of the substrate, is surface treated and the surface treated surface serves as the outer surface of the structural adhesive paper opposite the object to be bonded.

Compared with the prior art, the beneficial effects of the present invention are:

The outer surface of the structural adhesive paper of the present invention opposite to the object to be bonded has a lower dyne value, so the surface energy is lower, the protrusion of the active material layer at the edge of the structural adhesive tape can be eliminated, and the active material layer is solved. The edge of the ear position is raised.

The structural adhesive tape of the invention can improve the utilization rate of the active material, avoid waste of the active material, and simultaneously improve the energy density, fast charge and release, and heat dissipation performance of the battery.

The structural adhesive tape of the invention can meet the batch production demand of the battery, and improve the productivity and the excellent product rate of the battery.

DRAWINGS

1 is a perspective view of a current collector of a bonded object to which a structural adhesive tape according to the present invention is applied;

Figure 2 is a perspective view of a structural adhesive tape adhered to a current collector of a bonded object according to the present invention;

Figure 3 is a perspective view of a structural adhesive paper coated active material layer in accordance with the present invention;

Figure 4 is a perspective view of the structural adhesive tape after peeling according to the present invention;

Figure 5 is a perspective view of another embodiment of a structural adhesive sheet adhered to a current collector of a bonded object according to the present invention;

Figure 6 is a perspective view showing still another embodiment of the structural adhesive paper adhered to the current collector of the object to be bonded according to the present invention;

Figure 7 is a perspective view of an embodiment of a substrate of a structural adhesive tape in accordance with the present invention;

Figure 8 is a perspective view of another embodiment of a substrate of a structural adhesive tape according to the present invention;

Figure 9 is a perspective view of still another embodiment of a substrate of a structural adhesive tape according to the present invention;

Figure 10 is a perspective view of still another embodiment of a substrate of a structural adhesive tape according to the present invention;

Figure 11 is a cross-sectional view of the structural adhesive tape of Figure 3 taken along line A-A;

Figure 12 is an enlarged view of a circled portion of Figure 11;

Figure 13 is a cross-sectional view showing a prior art coated adhesive sheet coated with an active material layer applied to a current collector.

Among them, the reference numerals are as follows:

1,1' structural adhesive tape

11 adhesive layer

12 substrate

121 sublayer

122 sublayer

2,2' bonded object

21 reserved area

3,3' active material layer

_{S, S i, S t,} S i1, S i2, S t1, S t2 surface

W width direction

L length direction

T thickness direction

detailed description

The structural adhesive paper according to the present invention will be described in detail below.

Referring to Figs. 1 to 4, the structural adhesive sheet 1 of the present invention is used for sticking to the object 2 to be bonded. The dyne value of the outer surface S of the structural adhesive paper 1 opposite to the object 2 to be bonded is 20 dyn/cm to 28 dyn/cm. Referring to FIGS. 5 to 6, the structural adhesive sheet 1 includes an adhesive layer 11 for sticking to the object 2 to be bonded, and a substrate 12. One surface of the substrate 12 is adhered to the adhesive layer 11, and the other surface S _{i of} the substrate 12 (i.e., the surface of the substrate 12 opposite to the one surface adhered to the adhesive layer 11) is used as a structure. The outer surface S of the adhesive paper 1 opposite to the object 2 to be bonded, or the other surface of the substrate 12 (i.e., the surface of the substrate 12 opposite to the one surface adhered to the adhesive layer 11) is subjected to surface treatment. And the surface-treated surface S _{t is} used as the outer surface S of the structural adhesive paper 1 opposite to the object 2 to be bonded. Here, FIG. 5 shows the other surface itself S _i of the substrate 12, and FIG. 6 shows the surface treated surface S _t of the substrate 12. Both the surface S _i and the surface S _t can be used as the outer surface S of the structural adhesive sheet 1 opposite to the object 2 to be bonded. The dyne value of the outer surface S of the structural adhesive paper 1 opposite to the object 2 to be bonded can be obtained by the Dyne pen test.

In the structural adhesive paper 1 of the present invention, referring to Figs. 1 to 4, the object 2 to be bonded may be a current collector. Before coating the slurry of the active material layer 3 on the current collector, the structural adhesive paper 1 is pasted on the tenter-forming area 21 of the current collector, and the slurry is baked after the slurry is coated on the current collector. dry. After the drying is completed, the structural adhesive paper 1 is peeled off to form a reserved area 21 of the tab.

In the structural adhesive paper 1 of the present invention, referring to FIGS. 11 to 12, when the slurry of the active material layer 3 is applied to the outer surface of the bonded object 2 and the structural adhesive paper 1, due to the structure of the adhesive tape 1 The dyne value of the opposite outer surface S of the bonded object 2 is low, and the slurry located at the edge of the structural adhesive tape 1 is weakly bound by the structural adhesive tape 1, so that it is located on the structural adhesive tape under the surface tension of the slurry. The slurry at the edge 1 is slowly shrunk toward the adjacent object 2 to be bonded (in FIG. 7, the body W is contracted in the width direction W), and the drying process of the slurry is also performed simultaneously. When the residual amount of solvent in the material reaches a certain value, the slurry no longer migrates. At this time, the migration of the protrusion at the edge of the structural adhesive tape 1 through the slurry has been eliminated, and the slurry forms an active material layer 3 after drying, and the activity is active. The material layer 3 does not have protrusions. When the structural adhesive tape 1 is peeled off by the heat curl, no protrusion occurs at the peeling edge, the edge convex problem of the position of the active material layer 3 is solved, and the occurrence of the breakage phenomenon in the subsequent rolling process is avoided; The utilization rate avoids the waste of active materials, thereby improving the energy density, fast charge and release, and heat dissipation performance of the battery.

When the active material slurry is used in a lithium ion battery, generally, the viscosity of the active material slurry of the lithium ion battery is from 1000 mPa.s to 30,000 mPa.s. For high-viscosity active material slurry (eg, 30,000 mpa.s> viscosity > 8000 mPa.s), when the dyne value of the outer surface S of the structural adhesive tape 1 exceeds the upper limit, the specific conditions are poor due to the poor fluidity of the highly viscous active material slurry. The lower (time control) cannot completely eliminate the edge protrusion of the structural adhesive tape 1; when the dyne value of the outer surface S of the structural adhesive tape 1 is lower than the lower limit, the interaction force between the slurry and the outer surface S of the structural adhesive tape 1 If it is too low, the slurry of the outer surface S of the structural adhesive tape 1 is likely to migrate, and the edge bulging is intensified. Preferably, the outer surface S of the structural adhesive tape 1 has a dyne value ranging from 20 dyn/cm to 24 dyn/cm. For low-viscosity active material slurry (such as 8000mpa.s> viscosity >1000mpa.s), when the dyne value is lower than the lower limit, the slurry of the low-viscosity active material slurry is good, and under certain conditions, it is easy to cause the slurry. Excessive migration leads to increased edge bulging, and even when the dyne value exceeds the upper limit, the edge bulge cannot be completely eliminated. Preferably, the outer surface S of the structural adhesive tape 1 has a dyne value ranging from 24 dyn/cm to 28 dyn/cm.

The first type of structural adhesive paper 1 according to the present invention will now be described. Referring to FIG. 5, the structural adhesive sheet 1 may include an adhesive layer 11 and a substrate 12. The adhesive layer 11 is used for sticking to the object 2 to be bonded. One surface of the substrate 12 is adhered to the adhesive layer 11, and the other surface S _{i of the} substrate 12 is used as the outer surface S of the structural adhesive paper 1 opposite to the bonded object 2, and the other of the substrates 12 The dyne value of the surface itself S _i is 20 dyn/cm to 28 dyn/cm. In the first type of structural adhesive tape, the substrate 12 having a low surface energy is directly used to control the outer surface S of the structural adhesive tape 1 (i.e., the other surface itself of the substrate 12, S _i ) has a dyne value of 20 dyn. /cm ~ 28dyn / cm, in order to achieve the purpose of eliminating edge protrusions. In an embodiment of the first type of structural adhesive tape, referring to Fig. 7, the substrate 12 may have a single layer structure, and the surface S _i1 of the substrate 12 of the single layer structure serves as the other surface itself of the substrate 12 _i . At this time, the substrate 12 may be a polyfluoroolefin.

In another embodiment of the first type of structural adhesive tape, referring to FIG. 8, the substrate 12 can have N sub-layers, N being greater than or equal to two. One surface of the sub-layer 121 of the substrate 12 adjacent to the adhesive layer 11 (not shown) is adhered to the adhesive layer 11, and the substrate 12 is away from the adhesive layer 11 and is located at the outermost side of the substrate 12. The outer surface S _{i2 of the} sub-layer 122 serves as the other surface S _i of the substrate 12 , and the material of the sub-layer 122 of the substrate 12 remote from the adhesive layer 11 and located at the outermost side of the substrate 12 may be a polyfluoroolefin. The substrate 12 may have a multi-layer structure, as long as the material of the sub-layer 122 of the substrate 12 away from the adhesive layer 11 and located at the outermost side of the substrate 12 is a polyfluoroolefin, and the materials of the remaining sub-layers are not limit. Referring to Fig. 8, the substrate 12 has a two-layer structure as long as the material of the sub-layer 122 is a polyfluoroolefin, and the material of the sub-layer 121 is not limited. Preferably, the material of the sub-layer 121 may be polyethylene terephthalate (PET), polyimide (PI) or polyamideimide (PAI).

The dyne value of the surface of the polyfluoroolefin may range from 20 dyn/cm to 28 dyn/cm. Preferably, the polyfluoroolefin has a symmetrical structure. The polyfluoroolefin may be polytetrafluoroethylene or polyvinylidene fluoride. The fluorocarbon bonds in polytetrafluoroethylene or polyvinylidene fluoride are symmetrical, so the polar bond interactions cancel each other out. At the same time, due to the strong electronegativity of the fluorine atom, the ability to capture electrons is strong. Therefore, the positive electric center and the negative electric center do not overlap due to the instantaneous movement of the electron, resulting in a small dispersion force, so that the surface tension is small and the surface energy is low. When the outer surface of the substrate 12 using the polyfluoroolefin is in contact with the active material slurry, the force between the outer surface of the substrate 12 and the atom or molecule of the active material slurry is small, the friction coefficient is low, and the elimination is easily achieved. The purpose of the edge bulging.

In the first type of structural adhesive tape, the material of the adhesive layer 11 may be an acrylate resin or a polyurethane.

In the first type of structural adhesive tape, the binder layer 11 may contain a foaming agent. When the structural adhesive tape 1 is heated, the foaming agent is foamed so that the structural adhesive tape 1 is curled from the opposite side edges of the width direction W toward the intermediate portion, effectively controlling the curling direction of the structural adhesive tape 1; and the structural adhesive tape 1 The intermediate portion remains adhered to the object 2 to be bonded without peeling off, and an effective bonding area can be secured to prevent the structural adhesive sheet 1 from falling off from the object 2 to be bonded during heating. The blowing agent may be an azodicarbonamide (AC) blowing agent or a 4,4-oxobisulfonyl hydrazide (OBSH) blowing agent. The blowing agent may have a particle diameter of less than 30 μm. When the binder layer 11 contains a foaming agent, it is required that the thickness of the binder layer 11 may be larger than the particle diameter of the foaming agent and less than 70 μm. The thickness of the substrate 12 is not limited, and may preferably be less than 30 μm.

In the first type of structural adhesive tape, the substrate 12 can be rectangular to facilitate subsequent soldering of the tabs.

Next, a second type of structural adhesive paper 1 according to the present invention will be described. Referring to FIG. 6, the structural adhesive sheet 1 may include an adhesive layer 11 and a substrate 12. The adhesive layer 11 is used for sticking to the object 2 to be bonded. One surface of the substrate 12 is adhered to the adhesive layer 11, and the other surface of the substrate 12 is subjected to surface treatment and the surface-treated surface _{St is} used as the opposite of the bonded object 2 of the structural adhesive paper 1. The surface S, the surface-treated surface S _t of the substrate 12 has a dyne value of 20 dyn/cm to 28 dyn/cm.

In the second type of structural adhesive tape, the surface treatment area of the other surface of the substrate 12 is at least the entire peripheral portion of the other surface of the substrate 12 to reduce the surface energy of the peripheral portion of the substrate 12, The purpose of eliminating the edge protrusions is achieved. Preferably, the surface treated area of the other surface of the substrate 12 is the entire area of the other surface of the substrate 12.

In the second type of structural adhesive tape, the surface treated surface S _t of the substrate 12 can be obtained by applying the silicone oil to the other surface of the substrate 12. Since the molecular chain of the silicone oil is supple, the intermolecular force is small, and the silicon-oxygen bond is easily rotated. The oxygen atom on the skeleton of the molecular segment is combined with the outer surface of the structural adhesive paper by the intermolecular force, so that the methyl group and the like in the silicone oil having a low surface energy are oriented and arranged on the outer surface of the structural adhesive paper. The group such as a methyl group in the silicone oil has low electron attraction, forms a low surface energy interface, and can maintain its orientation stable in a temperature range of -40 ° C to 250 ° C, thereby achieving stable isolation.

In the second type of structural adhesive tape, the silicone oil may be selected from one or more of polydimethylsiloxane, cyclomethicone, aminosiloxane, polymethylphenylsiloxane. Kind. Silicone oil coating The thickness may be from 0.2 μm to 1 μm. The silicone oil is applied to at least the entire peripheral portion of the other surface of the substrate 12 to lower the surface energy of the substrate 12 for the purpose of subsequently eliminating edge projections.

In the second type of structural adhesive tape, the surface-treated surface S _t of the substrate 12 can also be obtained by subjecting the other surface of the substrate 12 to fluorination treatment. The surface after the fluorination treatment can graft a fluorine-based or fluorocarbon-based group of a non-polar functional group to achieve the purpose of reducing surface energy. The fluorinated treated area is at least the entire peripheral portion of the other surface of the substrate 12 to reduce the surface energy of the substrate 12 for the purpose of subsequently eliminating edge protrusions. Specifically, the surface of the substrate may be subjected to fluorination treatment using a fluorine-containing plasma gas to obtain the surface-treated surface. The fluorine-containing plasma gas may be a plasma gas of CF ₄ or a mixed plasma gas of CF ₄ and CH ₄ .

In an embodiment of the second type of structural adhesive tape, referring to FIG. 9, the substrate 12 may have a single layer structure, and the other surface S _t1 of the substrate 12 of the single layer structure is subjected to surface treatment to obtain the substrate 12 described above. Surface treated surface S _t . Since the surface-treated surface S _t of the substrate 12 is obtained by coating the surface S _t1 of the other surface S _t1 of the substrate 12 of the single-layer structure or performing fluorination treatment, the material of the substrate 12 itself is not limited. Preferably, substrate 12 can be polyethylene terephthalate (PET), polyimide (PI) or polyamideimide (PAI). Substrate 12 can also be a heat shrinkable material.

In another embodiment of the second type of structural adhesive tape, referring to FIG. 10, the substrate 12 may also have an N-layer structure with N being greater than or equal to two. One surface of the sub-layer 121 of the substrate 12 adjacent to the adhesive layer 11 (not shown) is adhered to the adhesive layer 11, and the substrate 12 is away from the adhesive layer 11 and is located at the outermost side of the substrate 12. The outer surface S _{t2 of the} sub-layer 122 is surface-treated to obtain the surface-treated surface S _{t of the} substrate 12. The surface-treated surface of the substrate 12 is obtained by coating the outer surface S _t2 of the substrate 12 away from the adhesive layer 11 and at the outermost surface layer 122 of the substrate 12 with a silicone oil or performing a fluorination treatment. S _t, so far away from the adhesive layer 11 and the substrate 12 is not limited in material sub-layer 122 outermost substrate 12. Preferably, the material of the sub-layer 122 of the substrate 12 remote from the adhesive layer 11 and at the outermost side of the substrate 12 may be polyethylene terephthalate (PET), polyimide (PI) or Polyamide imide (PAI). The material of the sub-layer 122 of the substrate 12 that is remote from the adhesive layer 11 and that is at the outermost side of the substrate 12 may also be a heat-shrinkable material. The material of the remaining sub-layers 121 is also not limited, and may preferably be polyethylene terephthalate (PET), polyimide (PI) or polyamideimide (PAI).

In the case where the substrate 12 contains a heat shrinkable material, when the structural adhesive tape 1 is heated, the heat shrinkable material The material is shrunk so that the structural adhesive tape 1 is curled from the opposite side edges of the width direction W toward the intermediate portion, effectively controlling the curling direction of the structural adhesive tape 1; and the intermediate portion of the structural adhesive tape 1 remains adhered to the bonded object 2 If it is not peeled off, an effective bonding area can be ensured, and the structural adhesive tape 1 can be prevented from falling off from the object 2 to be bonded during the heating process. The heat shrinkable material may be a polyvinyl chloride (PVC) heat shrinkable film, a low molecular weight polyethylene terephthalate (PET) heat shrinkable film or a biaxially oriented polyolefin (POF) heat shrinkable film. In the case where the substrate 12 contains a heat shrinkable material, the thickness of the substrate 12 may be less than 45 μm. The thickness of the adhesive layer 11 is not limited, and may preferably be less than 10 μm.

In the second type of structural adhesive tape, the material of the adhesive layer 11 may be an acrylate resin or a polyurethane.

In the second type of structural adhesive tape, the binder layer 11 may contain a foaming agent. The blowing agent may have a particle diameter of less than 30 μm. When the binder layer 11 contains a foaming agent, it is required that the thickness of the binder layer 11 may be larger than the particle diameter of the foaming agent and less than 70 μm. The thickness of the substrate 12 is not limited, and may preferably be less than 30 μm.

In the second type of structural adhesive tape, the substrate 12 can be rectangular to facilitate subsequent soldering of the tabs.

Claims (25)

A structural adhesive tape for sticking to an object to be bonded, characterized in that The dyne value of the outer surface of the structural adhesive paper opposite to the object to be bonded is 20 dyn/cm to 28 dyn/cm; The structural adhesive tape includes: An adhesive layer for adhering to the object to be bonded; a substrate having one surface adhered to the adhesive layer, the other surface of the substrate itself being the outer surface of the structural adhesive paper opposite to the object to be bonded, or the other surface of the substrate being surface treated And the surface-treated surface serves as an outer surface of the structural adhesive paper opposite to the object to be bonded. The structural adhesive tape according to claim 1, wherein the substrate has a single layer structure. The structural adhesive tape according to claim 1, wherein the substrate has N sub-layers, N is greater than or equal to 2; One surface of the sub-layer of the substrate adjacent to the adhesive layer is adhered to the adhesive layer, and the outer surface of the sub-layer of the substrate away from the adhesive layer and located at the outermost side of the substrate serves as the other surface of the substrate And the other surface of the substrate itself serves as an outer surface of the structural adhesive paper opposite to the object to be bonded, or the other surface of the substrate is surface-treated and the surface-treated surface serves as the structure The outer surface of the adhesive paper opposite the object being bonded. The structural adhesive tape according to claim 2, wherein when the other surface of the substrate itself is an outer surface of the structural adhesive paper opposite to the object to be bonded, the substrate is a polyfluoroolefin . The structural adhesive tape according to claim 3, wherein the other surface of the substrate itself serves as an outer surface of the structural adhesive paper opposite to the object to be bonded, and the substrate is away from the bonding The material of the agent layer and the outermost sub-layer of the substrate is a polyfluoroolefin. The structural adhesive paper according to claim 4 or 5, wherein the polyfluoroolefin is polytetrafluoroethylene or polyvinylidene fluoride. The structural adhesive tape according to claim 2, wherein the surface-treated surface is obtained by applying a silicone oil to another surface of the substrate or performing a fluorination treatment. The structural adhesive tape according to claim 7, wherein the substrate is polyethylene terephthalate, polyimide or polyamideimide. The structural adhesive tape according to claim 7, wherein the substrate is a heat shrinkable material. The structural adhesive tape according to claim 3, wherein the outer surface of the substrate away from the adhesive layer and at the outermost sub-layer of the substrate serves as the other surface of the substrate, through the substrate The other surface is coated with a silicone oil or subjected to a fluorination treatment to obtain the surface-treated surface. The structural adhesive tape according to claim 10, wherein the material of the sub-layer of the substrate remote from the adhesive layer and located at the outermost side of the substrate is polyethylene terephthalate or polyacyl. Imine or polyamideimide. The structural adhesive tape according to claim 10, wherein the material of the substrate that is away from the adhesive layer and is at the outermost sub-layer of the substrate is a heat-shrinkable material. The structural adhesive tape according to claim 9 or 12, wherein the heat-shrinkable material is a polyvinyl chloride heat shrinkable film, a low molecular weight polyethylene terephthalate heat shrinkable film or a biaxially oriented polymer. Olefin heat shrinkable film. A structural adhesive tape according to claim 7 or 10, wherein said silicone oil One or more selected from the group consisting of polydimethylsiloxane, cyclomethicone, aminosiloxane, and polymethylphenylsiloxane. The structural adhesive tape according to claim 7 or 10, wherein the silicone oil is coated in a thickness of from 0.2 μm to 1 μm. The structural adhesive tape according to claim 7 or 10, wherein the fluorination treatment is a fluorine-containing plasma gas treatment. The structural adhesive tape according to claim 16, wherein the fluorine-containing plasma gas is a plasma gas of CF ₄ or a mixed plasma gas of CF ₄ and CH ₄ . The structural adhesive tape according to claim 1, wherein the surface-treated region of the other surface of the substrate is at least the entire peripheral portion of the other surface of the substrate. The structural adhesive tape according to claim 1, wherein the material of the adhesive layer is an acrylate resin or a polyurethane. The structural adhesive tape according to claim 1 or 19, wherein the adhesive layer contains a foaming agent. The structural adhesive tape according to claim 20, wherein the foaming agent is an azodicarbonamide foaming agent or a 4,4-oxobissulfonyl hydrazide foaming agent. The structural adhesive tape according to claim 20, wherein said foaming agent has a particle diameter of less than 30 μm. The structural adhesive tape according to claim 20, wherein the thickness of the adhesive layer is larger than a particle diameter of the blowing agent and less than 70 μm; and the thickness of the substrate is less than 30 μm. The structural adhesive tape according to claim 9 or 12, wherein the adhesive layer has a thickness of less than 10 μm; and the substrate has a thickness of less than 45 μm. The structural adhesive tape according to claim 1, wherein the substrate is rectangular.

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