TW201501946A - Adhesive tape for flat panel display - Google Patents

Abstract

Disclosed is an adhesive tape for flat panel display 10 used to bond the flat panel display 20 onto the housing 30. The adhesive tape for flat panel display 10 is border-shaped of which the width is equal to or below 0.7 mm, and comprises an adhesion layer for adhering the bonding surface of the flat panel display 20 wherein the height of the adhesion layer is equal to or above 100[mu]m. The surface roughness of the adhesion layer is equal to or below 0.1[mu]m with respect to the arithmetic mean roughness, and equal to or below 1.5[mu]m with respect to the ten-point average roughness. Thus, it is easy for the adhesive tape to be bonded with the bonding surface even when the adhesive tape, and the is narrowly border-shaped bonding strength and the water resistantce are duly secured.

Description

Flat display tape

The present invention relates to a tape for a flat panel display for bonding a body (a plastic or metal container for accommodating a main part of the device) to a flat display for use in a device such as a smart phone.

Up to now, electronic devices such as smart phones, tablet terminals, cameras, portable music players, and the like have flat-panel displays and a body for housing a CPU, a rechargeable battery, and the like, and the flat displays and the body are generally joined together by tape.

In order to ensure the followability to the joint surface of the body and the waterproof property between the flat display and the body, and to absorb the impact such as dropping, a double-sided tape provided with an adhesive layer on both sides of the foam substrate is used. An adhesive tape used when the flat display and the body are joined together to form a final product (for example, refer to Patent Documents 1 to 3).

Patent Document 1 discloses that a double-sided tape having an adhesive layer on both surfaces of a foam substrate is used as a foam substrate, and a tensile strength of 25% is used in a range of 40 to 160 kPa, and tensile strength is used. The foam base material in the range of 300 to 500 N/cm ² , so that even when the rigid bodies are joined to each other, the adhesion between the double-sided tape and the adherend can be improved, thereby Prevent water from entering the body.

Patent Document 2 discloses a double-sided tape which is provided with an adhesive layer on both sides of a foam substrate, and has a total thickness of 250 μm or less and a tensile strength of 0.5 to 20 MPa. Thereby, good water repellency (water repellency) and processability are obtained.

Patent Document 3 discloses a double-sided tape having an adhesive layer on both sides of a foam substrate, the interlayer strength of the foam substrate being 12 N/cm or more and 25% compressive strength at 30 Between ~170 kPa, the adhesive layer is composed of an acrylic adhesive composition containing an acrylic copolymer and a polymeric terpine ester-based tackifying resin, and the acrylic copolymer has the following components as a monomer component, that is, a carbon number of 4~ a (meth) acrylate of 12; and a vinyl monomer having a carboxyl group. Further, Patent Document 3 describes that the adhesion between the double-sided tape and the adherend can be improved when the rigid bodies are bonded to each other, and the reworkability and re-peelability can be achieved, and the re-peelability can be effectively achieved. Prevent water from entering.

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-108314

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-155969

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2010-260880

According to the double-sided tapes of Patent Documents 1 to 3, since the base material-based foam is extremely soft, it has the advantage that it can easily follow the joint surface joined to the body in the flat-panel display and the joint with the flat display in the machine body. Concavities and convexities on the joint surface.

However, the double-sided tapes of Patent Documents 1 to 3 have the following problems.

That is to say, since the flat display is required to expand the effective display area as much as possible without changing the outer size, that is, the so-called narrow frame is required, the width of the joint surface for the flat display to be joined to the body is narrowed. The narrowing of the width of the joint surface means that the width of the tape must also be correspondingly narrowed. The width required for the tape is, for example, 1.0 mm or less, and may be, for example, 0.7 mm or less.

However, in order to ensure followability, the base materials in Patent Documents 1 to 3 use a foam having a closed cell structure. On the joint surface of the base material of the tape which is joined to the body or the like, the closed cells are formed in an open state, and the open width of the closed cells in the open state is 200 μm to 600 μm, and is also larger than 200 μm to 600 μm. The width is uneven. Thus, if, for example, the width of the tape is narrowed by 1.0 mm, the number of closed cells opened at the joint surface per unit area increases, and further, the possibility that the opening width of the closed cells is larger than the width of the joint surface is increased. This means that the bonding strength of the tape is lowered, and the waterproof performance is drastically lowered.

In Patent Documents 1 to 3, the base material is a foam, and thus an opening for closing the air bubbles is present on the surface of the substrate on which the adhesive layer is to be formed. As a result, the smoothness of the adhesive layer is lowered. Further, in the case where an inexpensive paper separation film is used in order to lower the price, the smoothness of the adhesive layer is also lowered. For this reason, when the joint surface of the flat display or the body is smooth, a large pressure is required in order to make the adhesive layer tightly joined to the joint surface.

In general, after the flat display is bonded to the body, the pass/fail of the device is judged. In this case, when either of the flat display and the body fails, it is preferable from the viewpoint of cost reduction. For the plane The display is peeled off from the body for repair.

However, in the case of using a foam substrate, when a peeling force is applied, since the closed cells are present in the foam substrate, the foam substrate is liable to undergo cohesive failure, thereby foaming the substrate and the adhesive layer. It remains on the joint surface of both the flat display and the body, and the foam base material and the adhesive layer are very difficult to remove.

In this regard, Patent Document 3 describes that the tape has good reworkability. However, since the tape is a tape having a foam substrate, the foam substrate is liable to undergo cohesive failure and does not change, and it is not possible to pull the tape from the joint surface of the flat display or the body by merely pulling the tape by fingers. Stripped completely without rupturing the tape.

Since a general acrylic adhesive is crosslinked for enhancing the cohesive force, it is difficult to separate and recover the binder from the foam substrate, for example, when the tape is cut into a frame shape, a large cutting allowance is formed on the inner side. It can only be discarded, so that resources cannot be used effectively.

The present invention has been made in view of the above-described problems, and it is an object of the present invention to enable a tape to be easily brought into contact with a joint surface even when the tape has a narrow frame shape having a width of 0.7 mm or less, and to secure sufficient joint strength and water repellency.

In addition, in order to solve the above problem, the tape can be completely and easily reworked than the conventional tape, and the cutting residue generated when the dicing tape is formed into a frame shape can be recovered, so that the tape can be effectively utilized. Resources.

In order to achieve the above object, the inventors conducted intensive research and found that The tape having the following structure can solve the above problems, thereby completing the present invention.

The invention of the first type is a tape for a flat display, which is used for joining a flat display and a body, wherein the flat display is formed of a tape having a width of 0.7 mm or less and having a bonding surface with the flat display. In the adhesive layer, the thickness of the adhesive layer is set to 100 μm or more, and the surface roughness of the adhesive layer is 0.1 μm or less in terms of arithmetic mean roughness and 1.5 μm or less in terms of ten-point average roughness.

According to such a configuration, the adhesive layer is a tape having a narrow frame shape in which the width of each side is 0.7 mm or less. Since the thickness of the adhesive layer is 100 μm or more, the adhesive layer can be sufficiently deformed to easily follow the shape of the joint surface of the flat display and the body, and is easily brought into contact with the joint surface.

The surface roughness of the adhesive layer is 0.1 μm or less in terms of arithmetic mean roughness and 1.5 μm or less in terms of ten-point average roughness, so that the surface of the adhesive layer becomes a sufficiently smooth surface. In this way, since the surface roughness of the adhesive layer is smoothed by about 10 times than the surface roughness of the adhesive layer of the conventional tape, the adhesive layer can be easily brought into contact with the smooth surface. Thereby, sufficient joint strength and water repellency can be ensured.

In the first type of invention, in the first type of invention, when the above-mentioned adhesive laminate having a thickness of 100 μm and a width of 25 mm is attached to the surface of a stainless steel plate, the 180-degree peel strength is 50 N or more, and peeling off When the adhesive layer having a thickness of 100 μm was tested with a dumbbell-shaped No. 3 test piece, the tensile strength at an elongation of 25% was in the range of 0.5 MPa to 1.0 MPa.

According to such a configuration, it is possible to ensure that the tape has a bandwidth of 0.7 mm. When the tape has a narrow frame shape with a width of 0.7 mm or less, the specific bonding strength in the case of the narrow frame shape is the same as the bonding strength when the tape of the foam substrate which has been conventionally used has a width of 1 mm or more. The specific bonding strength is higher than the bonding strength when the tape having the conventionally used foam substrate has a width of 1 mm or more. Since the interface is peeled off at the time of peeling, a part of the adhesive layer does not remain on the flat display or the body, and the reworking can be easily performed.

Since the tensile strength at an elongation of 25% is in the range of 0.5 MPa to 1.0 MPa, the adhesive layer has moderate flexibility and can satisfactorily follow the joint surface shape of the flat display and the joint surface shape of the machine body.

The invention of the third type: in the invention of the first type, the tape has the joint strength that the above-mentioned tape having a width of 0.5 mm is disposed between the peripheral portions of two sheets of 50 mm × 100 mm, The two sheets were joined by the above-mentioned tape, and the two sheets were horizontally arranged and fixed to the upper sheet while being cooled to minus 20 ° C, when the weight of the DuPont-type impact test 300 g was dropped on the lower sheet. The lower plate is not peeled off from the upper plate until the falling distance of the weight reaches 30 cm.

According to such a configuration, since the impact at normal temperature and low temperature can be sufficiently absorbed by the adhesive layer, when the product made of the tape of the present invention is impacted or dropped, the peeling of the flat display can be suppressed and the reliability can be improved.

The fourth type of invention: In the first type of invention, when the adhesive layer having a thickness of 100 μm is tested with a dumbbell-shaped test piece No. 3, the tensile strength at an elongation of 1000% is 3.0 MPa or more. Within the range of 6.0 MPa or less.

According to such a configuration, the adhesive layer will have rubber elasticity, so that the adhesive layer does not break during the reworking, and it can be cleanly peeled off from the joint surface of the flat display or the joint surface of the body.

According to a fifth aspect of the invention, in the first aspect of the invention, the composition of the adhesive layer is a composition having a weight ratio of the elastomer to the tackifier in a range of 1/0.3 or more and 1/1 or less, The elastomer is a styrene elastomer and is reversible.

According to such a configuration, since the elastomer is a styrene-based elastomer, solvent solubility is improved, and workability such as coating is improved. Since the ratio of the tackifier is in a range lower than that of the conventional general tape, the elasticity of the elastic body can be sufficiently maintained.

Since the adhesive layer is not irreversible like the general adhesive after cross-linking, but is reversible, the adhesive layer can be dissolved again in the solvent, and the cutting residue which is generated in a large amount during cutting can be made into the adhesive layer of the adhesive tape again. Reuse.

When the adhesive layer of the tape is a single layer, the entire composition of the cutting material can be directly dissolved in an organic solvent to produce a solution of the adhesive composition.

According to a sixth aspect of the invention, in the first aspect of the invention, the flat panel display tape is produced by any one of the following methods, that is, a method of forming the adhesive layer by a coating method and then cutting into a predetermined shape, The coating method covers the object to be coated by using a fluidity adhesive; and the fluidity adhesive is applied by a spreader to form the above-described bonding of a predetermined shape. A method of forming a layer; and a method of forming a binder having a fluidity on a printed matter to form the above-described adhesive layer having a predetermined shape.

According to such a configuration, in addition to the same coating method as that of a general tape, the adhesive layer can be formed in the following manner, and thus it is possible to avoid unnecessary things such as cutting residual materials. The manner is: a spreading method, which utilizes a thermo-compressible hot-melt adhesive for heat reversal; and a printing method in which the adhesive is dissolved in an organic solvent or thermally melted. Printed on the printed matter in the state.

According to the first aspect of the invention, it is possible to meet the high requirements in the flat panel display, that is, the narrow frame having a width of 0.7 mm or less. Since the thickness of the adhesive layer is 100 μm or more, the adhesive layer can sufficiently follow the unevenness of the joint surface of the flat display or the joint surface of the body, and can easily contact the smooth joint surface because the surface of the adhesive layer is smooth. . Thereby, the adhesive strength can be sufficiently improved, and stable and high water repellency can be ensured.

According to the second aspect of the invention, even if it is formed into a narrow frame shape having a width of 0.7 mm or less which has been difficult to achieve in the past, the bonding strength equal to or higher than that of the tape having a general foam substrate can be obtained. Since the tensile strength at an elongation of 25% is set within a predetermined range, the adhesive layer is not too soft like a general tape, and is not hard to follow a flat display or a body, so that a weaker clip can be used. The tightening force causes the adhesive layer to follow the flat display or the body, thereby sufficiently improving the bonding strength and ensuring stable and high water repellency. When peeling off, there is no part of the tape remaining on the flat display or the body, and it can progress well. Reprocessing.

According to the invention of the third type, since the result of the DuPont impact test at a low temperature is better than that of a tape having a general foamed substrate, when the product made using the tape of the present invention is impacted or dropped, the adhesive layer can absorb Since it is impacted or impacted when dropped, it is possible to suppress peeling of the flat display and improve reliability.

According to the invention of the fourth type, since the adhesive layer still has sufficient tensile strength in the state of elongation of 1000%, the tape is not broken on the way even when the tape is peeled off by the finger during reworking, and the adhesive layer can be flat. He is peeled off cleanly on the display or on the body.

According to the fifth aspect of the invention, since the main component of the binder composition is a styrene-based elastomer and a predetermined ratio is set to the tackifier, the solvent solubility or the workability such as coating is good, and the maintenance is maintained. The bismuth properties of the styrene elastomer can ensure adhesion, impact absorption, tensile strength, and reworkability in a balanced manner.

Since the binder composition is not crosslinked like a general binder, it can be reversibly dissolved in a solvent, and a large amount of the cutting residue at the time of cutting can be dissolved again in an organic solvent, and then coated and regenerated into a tape. Compared to tape, it is more environmentally friendly and can use resources efficiently.

According to the sixth aspect of the invention, the adhesive layer can be formed by a coating method in the same manner as a general foam substrate, and can be easily processed into a narrow frame shape of 0.7 mm or less. Since the adhesive layer is provided with hot meltability and stable solubility to an organic solvent to impart fluidity to the adhesive layer, it is also possible to use a spreading method or a printing method that does not generate a cutting residual material. Narrow frame processing, which is more friendly to the environment and can effectively utilize resources than ordinary tape.

1‧‧‧Smart mobile phone

10‧‧‧Panel for flat panel display

20‧‧‧ flat panel display

30‧‧‧ body

1 is an exploded view of a smart phone according to an embodiment of the present invention.

Figure 2 is a top plan view of a tape for a flat panel display.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. It should be noted that the following description of the preferred embodiments is merely an essential example and is not intended to limit the scope of the invention, its application, or its use.

Fig. 1 is an exploded perspective view of a smartphone 1 manufactured by using the tape 10 for a flat panel display according to an embodiment of the present invention. The smart phone 1 includes a flat display 20, a body 30, and a tape 10 for a flat display. The flat display 20 includes a liquid crystal display panel, an organic electroluminescence panel, or the like. The flat panel display is used with the tape 10 for joining the flat panel display 20 and the body 30.

The portion of the flat display 20 that is joined to the body 30 is made of, for example, a resin plate or a glass plate. In this embodiment, the flat display 20, which is a so-called narrow bezel flat display 20, which expands the effective display area without changing the outer dimensions of the flat display 20 is employed. Here, the frame portion refers to a plane having a darker color (for example, black) so that a terminal or the like connected to the liquid crystal element or the like is not seen from the front side of the flat display 20. The colored portion of the peripheral portion of the display 20 is colored. In the present embodiment, the width of the frame portion of the flat display 20 is set to 0.7 mm. However, the present invention is not limited thereto, and the width of the frame portion of the flat display 20 may be 0.7 mm or less, and may be set to, for example, 0.6. Mm or 0.5mm, 0.4mm.

It should be noted that the flat display 20 is not limited to the use of the above panel, and various display devices can also be used. A touch panel sensor can also be mounted on the flat display 20.

The body 30 is a box-shaped container for accommodating, for example, a control device, a speaker, a camera, a rechargeable battery, or the like (all not shown), and can be made of, for example, resin, metal, or the like.

In the description of this embodiment, the case of manufacturing the smart phone 1 will be described, but the flat display tape 10 can also be used in the case of manufacturing, for example, a tablet terminal, a camera, a portable music player, etc., having a flat display and a body. Various electronic devices are the application objects of the present invention.

As shown in FIG. 2, the flat display tape 10 has a rectangular frame shape having four sides, which conforms to the shape of the frame portion of the flat display 20. The width A of each side of the tape 10 for flat panel display, that is, the bandwidth A is 0.7 mm or less. Since the bandwidth A is set to be substantially the same as the width of each side of the frame portion of the flat display 20, it is only necessary to align the flat display with the tape 10 on each side of the frame portion. The flat display tape 10 has a single-layer structure composed only of an adhesive layer, and the adhesive layer is bonded to the joint surface of the flat display 20. Even with such a single layer construction, the flat panel display tape 10 is still a double-sided tape.

It should be noted that the flat display tape 10 can also be used as a substrate. Double-sided tape with an adhesive layer of 100 μm or more on both sides. Here, if the base material uses a foamed layer like a conventional tape, when it is cut into a narrow frame shape, the water repellency and the joint strength are remarkably lowered for the above reasons, which is not preferable. In the present embodiment, a hard and dense substrate such as PET (polyethylene terephthalate) or PP (polypropylene) is used. In this case, although the die-cut property is better than that of the single-layer structure, the base material serves as an insulating layer, and the thickness of the flat display tape 10 is 200 μm or more even if an adhesive layer of 100 μm is provided on both surfaces of the substrate. In essence, only the effect of the adhesive layer of 100 μm (following the joint surface) can be obtained. That is to say, if a hard substrate is used, the substrate is hard to be deformed, and the followability of the substrate to the joint surface of the flat display 20 or the joint surface of the body 30 is lowered. Therefore, it is preferable to bond the two sides of the substrate. The thickness of the layer is 100 μm or more.

If the adhesive layer of the flat display panel tape 10 is a single layer structure, the thickness of the adhesive layer is made 100 μm or more. Further, the adhesive layer is a layer containing no elastomer as a main component of the elastomer.

In the conventional double-sided tape using a foam substrate, as described above, the size of the closed cells in the foam substrate is 200 μm to 600 μm, and the size of the closed cells is not more than 200 μm to 600 μm. Qi. Thus, if, for example, the width of the tape is narrowed by 1.0 mm, the number of closed cells opened at the joint surface per unit area increases. This means that the strength of the foam substrate is significantly lowered. Further, the possibility that the opening width of the closed bubble is larger than the width of the joint surface is increased, and the closed bubble becomes a water path, so that it may become impossible to ensure water repellency.

Further, in the case of the conventional double-sided tape using the foam substrate, when cutting into a narrow frame shape, the number of closed cells opened on the outer surface of the tape increases, and the strength of the foam substrate decreases and the outside The resistance to pressure drops significantly, making it easy to leak under water pressure. A conventional double-sided tape using a foam base material has a drawback that the foam base material is easily broken when a peeling force acts.

On the other hand, in the present embodiment, the adhesive layer is a layer (solid structure) which does not contain bubbles as a main component of the elastomer. Therefore, even if it is die-cut into a narrow frame shape having a bandwidth A of 0.7 mm or less, bubbles which are open on the outer side surface do not occur. Thereby, the resistance to the external pressure is not drastically lowered, and the waterproofness between the flat display 20 and the body 30 can be sufficiently ensured by the adhesion to the flat display 20 or the body 30 and the strength of the adhesive layer itself. In this case, the bonding strength of the flat display display tape 10 to the flat display 20 or the body 30 is twice as high as that of the general foamed base tape. Further, since the main component of the adhesive composition is composed of an elastomer having rubber elasticity, the elongation and resistance to water pressure are large (it is easy to elongate when subjected to water pressure but is not easily broken), and reliability can be easily ensured. High and stable water resistance.

Specifically, the composition of the adhesive layer of the flat display display tape 10 contains a tackifier and a styrene-based elastomer, and the weight ratio of the elastomer/tackifier is in the range of 1/0.3 to 1/1.

Examples of the styrene-based elastomer include SBS (polystyrene-poly(butylene) block-polystyrene) and SIS (polystyrene-poly(isoprene) block-polystyrene). SIBS (polystyrene-poly(isoprene/butene) block-polyphenylene Aene, SEP (polystyrene-poly(ethylene/propylene) block), SEPS (polystyrene-poly(ethylene/propylene) block-polystyrene), SEBS (polystyrene-poly(ethylene/butyl) Alkene block-polystyrene), SEEPS (polystyrene-poly(ethylene-ethylene/propylene) block-polystyrene), and the like.

As the tackifier, a rosin-based tackifier, a terpene-based tackifier, and a hydrocarbon-based tackifier can be used alone or in combination, and as the liquid oligomer, acrylic, styrene, rubber, and polyester can be used. High viscosity polymers with molecular weights ranging from hundreds to thousands.

When the ratio of the elastomer/tackifier is less than 1/0.3, the adhesiveness cannot be exhibited, and the initial intimate bonding force cannot be sufficiently obtained, which is not preferable as the binder. Further, when the ratio of the elastomer/tackifier is less than 1/0.3, the followability to the joint surface shape of the flat display 20 or the joint surface shape of the body 30 is lowered, which is not preferable.

On the contrary, when the ratio of the elastomer/tackifier is more than 1/1, although the adhesiveness can be sufficiently exhibited, the cohesive force of the adhesive layer is lowered, and when the peeling is performed during the reworking, the adhesive layer causes cohesive failure. A portion of the adhesive layer may remain on the joint surface of the flat display 20 or a portion of the joint surface of the body 30. As a result, it takes time and effort to peel the adhesive layer from the joint surface of the flat display 20 or the joint surface of the body 30 in the subsequent process, which is not preferable.

Further, when the ratio of the elastomer/tackifier is outside the above range, the tensile strength at the elongation of 25% described later does not fall within the range of 0.5 MPa to 1.0 MPa, and the tensile strength of 1000% described later does not fall. In the range of 3.0 MPa to 6.0 MPa, it is impossible to follow the unevenness of the joint surface of the flat display 20 or When the unevenness of the joint surface of the body 30 is deformed, and the peeling is performed during the reworking, the adhesive layer is broken and the workability is lowered, which is not preferable.

The styrene-based elastomer has good solubility in an organic solvent, and the solubility is reversible. Therefore, when the adhesive layer is a single-layer structure, it is possible to use an organic solvent to form a large amount of residual material (cutting residual material) during die-cutting. The solution is dissolved, and the dissolved residue is applied to the object to be coated in a coating manner to be regenerated into an adhesive layer.

When the flat-panel display tape 10 has a base material, the dissolved adhesive layer can be reused by coating only after the adhesive layer is dissolved and the substrate is separated and recovered. As described above, the tape for a flat panel display of the present embodiment can effectively utilize resources and is friendly to the environment.

When the thickness of the adhesive layer is less than 100 μm, the followability of the joint surface shape of the flat display 20 or the joint surface shape of the body 30 is lowered, and it becomes difficult to obtain stable water repellency. Further, if the thickness of the adhesive layer is less than 100 μm, when the peeling force acts on the flat display 20 or the body 30 after the flat display 20 and the body 30 are joined, the amount of deformation of the adhesive layer becomes small, thereby causing deformation from the adhesive layer. The amount of work is reduced, so that the joint strength is lowered.

The thickness of the adhesive layer is more preferably 200 μm or more. The upper limit of the thickness of the adhesive layer varies depending on the type of the electronic device, and is, for example, about 1000 μm .

When the flat display tape 10 is obtained by coating, when the thickness of the adhesive layer is 500 μm or more, it is considered that it is difficult to manufacture the adhesive layer. However, in terms of the spreading method, it is possible to manufacture even if the thickness of the adhesive layer is 500 μm or more. When the adhesive layer having a thickness of 200 μm or more is produced by coating, the base layer can be formed by first forming an adhesive layer having a thickness of less than 200 μm and then bonding a plurality of the adhesive layers in the thickness direction. Thicker bonding layer of the material. Also in this case, since the adhesive layer does not contain the substrate, the adhesive layer has a single layer structure.

The surface roughness of the adhesive layer is 0.1 μm or less in terms of arithmetic mean roughness, and the average roughness of ten points is 1.5 μm or less. If the surface roughness of the adhesive layer is greater than the surface roughness, the contact between the adhesive layer and the smooth surface of the joint surface of the flat display 20 or the joint surface of the body 30 is lowered, and an excessive pressing force is required with respect to the flat display 20 or the body 30. Or curing time, which is not ideal.

When a separation film made of a smooth material such as PET, PP, or PE (polyethylene) is used, and a binder composition is applied to the separation film, the surface roughness of the adhesive layer can be maintained within the above numerical range. In the case of using a separation membrane made of paper, the surface roughness of the adhesive layer is 1.0 μm or more in terms of arithmetic mean roughness and 8.0 μm or more in ten-point average roughness, and the smoothness is remarkable. The ground is falling, so it is not ideal.

As a method of measuring the smoothness of the surface of the adhesive layer, a contact type stylus type surface roughness measuring instrument; a non-contact type laser microscope; and an optical interference method can be used.

The arithmetic mean roughness Ra means that a reference length is sampled from the roughness curve in the mean line direction, and the sum of the absolute values of the deviations from the average line of the sampled portion to the measurement curve is obtained and averaged. The value. The ten-point average roughness Rz refers to: sampling a reference length from the roughness curve in the mean line direction, and the average value of the absolute value from the highest peak to the fifth peak from the average of the sampling portion. The sum of the average values of the absolute values of the elevation from the lowest valley to the fifth bottom. Both Ra and Rz are expressed in μ m .

When the adhesive for the flat-panel display tape 10 having a thickness of 100 μm and a width of 25 mm is bonded to the surface of the stainless steel plate, the 180-degree peeling strength is 50 N or more, and the adhesive layer of the flat-panel display tape 10 is peeled off by the interface. The state is peeled off from the stainless steel plate. When the 180-degree peeling strength is less than 50 N, when the width of the frame portion is 0.7 mm or less, the bonding strength of the flat display tape 10 is lower than that of the conventional tape having a general foam substrate at a width of 1 mm or more. Strength is therefore not ideal. The 180 degree peel strength is more preferably 60 N or more. The test method for the 180 degree peel strength is detailed below.

If a structure in which cohesive failure occurs when subjected to a peeling force like a conventional tape, when the tape is peeled off from the flat display 20 or the body 30 for reworking, a part of the tape remains on the flat display 20 On the joint surface of the surface or the body 30, it is necessary to perform the work of peeling off the residual tape in the subsequent process, which is very time consuming and laborious, and thus is not preferable.

In order to simultaneously satisfy the strong joint strength and the interface peeling, it is necessary to increase the joint strength of the adhesive layer while making the cohesive force of the adhesive layer larger than the joint strength. In order to achieve this, in the present embodiment, an elastomer having rubber elasticity is used as a main raw material of the binder composition. Further, in order to impart a strong adhesive force without lowering the elasticity of the rubber, the ratio of the elastomer/tackifier is preferably within the above range.

In this embodiment, when the adhesive layer having a thickness of 100 μm is tested with a dumbbell-shaped No. 3 test piece, the tensile strength at an elongation of 25% is in a range of 0.5 MPa to 1.0 MPa. When the tensile strength is less than 0.5 MPa, the adhesive layer is too soft, and the tensile strength at an elongation of 1000%, which will be described later, does not fall within the range of 3.0 MPa to 6.0 MPa, and the flat display is peeled off from the flat display 20 or the body 30. When the tape 10 is used, the flat display display tape 10 is cohesively broken, and when the flat display is peeled off by the tape 10 during the rework, the flat display tape 10 is broken during the peeling process, resulting in a decrease in workability, which is not ideal.

Conversely, when the tensile strength of the adhesive layer at 25% elongation is greater than 1.0 MPa, the elastic modulus of the adhesive layer is too high (too hard), and the adhesive layer cannot follow the unevenness of the flat display 20 or the unevenness of the body 30, thereby It is not ideal to ensure water resistance.

In this embodiment, when the adhesive layer having a thickness of 100 μm is tested with a dumbbell-shaped No. 3 test piece, the tensile strength at an elongation of 1000% is in the range of 3.0 MPa to 6.0 MPa. When the tensile strength at an elongation of 1000% is less than 3.0 MPa, when the tape is peeled off during the reworking, the adhesive layer is broken during the peeling of the adhesive layer, and workability is lowered, which is not preferable. On the other hand, if the tensile strength at an elongation of 1000% is more than 6.0 MPa, the elastic modulus of the adhesive layer is too high, and the tensile strength at an elongation of 25% does not fall within the above range of 0.5 MPa to 1.0 MPa. The initial adhesion or unevenness of the adhesive layer to the flat display 20 or the body 30 may be lowered, which is not preferable.

The adhesive force of the flat display tape 10 can also be measured in the following manner. Tape 10 for flat panel display with bandwidth A set to 0.5 mm After being disposed on the peripheral portion of one of the faces of the 50 mm × 100 mm plate, the plate is bonded to the central portion of the 100 mm × 100 mm plate with the tape 10 through the flat display, and the whole is cooled to minus 20 ° C. The horizontally arranged 100 mm x 100 mm sheet is located above and only the 100 mm x 100 mm sheet is fixed. A through hole is first provided in a central portion of the 100 mm × 100 mm plate, and a weight receiving jig is bored in the through hole to abut the lower plate (50 mm × 100 mm plate). The flat display display tape 10 has the joint strength, that is, when the drop weight of the DuPont-type impact test is dropped on the weight receiving jig to apply an impact force to the lower plate, the falling distance of the heavy object is reached. Before 30cm, the lower plate will not peel off from the upper plate. The impact test method is described in detail below. As a result of the impact test, it was revealed that the flat-bed display tape 10 has an absorption force capable of absorbing as much impact as the chemically strengthened glass is destroyed. It should be noted that when the same test was carried out with a double-sided tape having a general foam substrate, the lower plate was peeled off from the upper plate before the falling distance of the weight reached 30 cm.

The good impact absorption force of the adhesive tape 10 for a flat display of the present embodiment is caused by, for example, a rubber-elastic elastomer having a large stretchable component of the adhesive composition constituting the adhesive layer of the flat display display tape 10 The elastic body can convert the impact energy into heat energy; the thickness of the adhesive layer is more than 100 μm thick, and the energy absorbed by the deformation of the adhesive layer is greater than the work energy of the impact energy; the adhesion to the flat display 20 or the body 30 is as high as Since the conventional double-sided tape of the foam base material is twice or more, it is not peeled off from the joint surface of the flat display 20 or the joint surface of the machine body 30. from.

The flat display display tape 10 can be manufactured by any one of the following methods, that is, a method of forming an adhesive layer by a coating method and then cutting into a predetermined shape by using a fluidity adhesive to cover the coated object; A method of applying a fluidity adhesive to form a predetermined shape of an adhesive layer by using a dispenser, and a method of forming a fluid having a fluidity on a to-be-printed material to form a predetermined shape of an adhesive layer.

In the case of the coating method, the adhesive layer material can be dissolved in an organic solvent such as general toluene or ethyl acetate, and coated with the coating material, and then the organic solvent is evaporated to obtain an adhesive layer. , using a cutting plotter or die cutting to form a tape with a narrow bezel shape.

As a coating method at this time, when a thick film is to be applied at one time, a die coater, a comma coater, and a curtain coater are effective, and when laminated, it is laminated. When a thick film is formed, a general roll coater, a reverse coater, a gravure coater, etc. can be utilized.

In the case of using the spreading method, since the bonding composition has thermoplasticity, it is possible to form a narrow frame shape by using a hot-melt type spreading device or a high-viscosity solution in which a bonding composition is dissolved in an organic solvent at a high concentration. . In the case where a high viscosity solution in which an adhesive composition is dissolved in an organic solvent forms a narrow frame shape, a process for evaporating the organic solvent is provided.

In the case of using a printing method, a thick film can be printed in such a manner that since the adhesive composition has thermoplasticity, the heat bonding composition is After the adhesive composition is melted, a thick film is printed using a gravure, and a thick film is printed by stencil printing with a high-viscosity solution in which a hot-melt adhesive or a binder composition is dissolved in an organic solvent. In the case where a frame is formed by using a high-viscosity solution in which an adhesive composition is dissolved in an organic solvent, a process of evaporating the organic solvent is provided.

In the case of using a die-cutting or cutting plotter, the surface of the adhesive layer that is bonded to the flat display 20 or the like becomes a flat surface. On the other hand, when a spreading or printing method is used, the cross section of the adhesive layer is a semi-cylindrical shape that protrudes upward, and when the flat display 20 or the body 30 is pressed against the formed narrow-frame-shaped adhesive layer, it is a line contact. As a result, the sealing effect by the O-ring can be obtained, and the water repellency is further improved, which is desirable.

In the case of using die-cutting, the flat-panel display tape 10 (multilayer structure) having a PET or PP substrate has good die-cut properties.

When the flat display 20 and the body 30 are sandwiched by the flat display tape 10, it is necessary to apply a clamping force to the entire flat display 20 in order to secure the tightness and improve the waterproofness.

At this time, an appropriate value of the clamping force is in the range of 0.3 MPa to 3.0 MPa. When the clamping force is less than 0.3 MPa, the degree of close contact between the flat display 20 and the body 30 is insufficient for the entire periphery of the flat display tape 10, and it becomes difficult to ensure waterproofness. Conversely, when the clamping force is greater than 3.0 MPa, the flat display 20 is subjected to excessive pressure, which may cause damage to the flat display 20, which is not desirable. In order to improve the close adhesion of the flat-panel display tape 10, it is also effective to heat the flat display with the tape 10 without affecting the flat display 20.

[Examples]

Hereinafter, the embodiments of the present invention will be described, but the present invention is not limited to the embodiments. Before describing the embodiment, the measurement methods of each item will be described.

1. Measurement of surface roughness

The separation film of the flat-panel display tape 10 was peeled off, and a reference length of 4 mm was measured on the surface of the adhesive layer using a 3D measurement laser microscope (LEXT OSL4000 Olympus Co., Ltd.), and the arithmetic mean roughness Ra was measured. And ten points average roughness Rz. Ra and Rz are the smaller the value, the smoother the representation.

2.180 degree peel strength test

A 25 μm PET film (lumirror manufactured by Toray Industries, Inc.) was attached to one surface of the flat-panel display tape 10 as a back sheet, and then cut into a strip shape having a width of 25 mm. The PET separation membrane was peeled off and attached to a stainless steel plate (SUS304BA) only to a length of 100 mm, and then placed horizontally, and a 2 kg rubber roller was moved back and forth twice on the back plate surface, and the flat display was crimped to the stainless steel with the tape 10 On the board.

After the pressure was applied and placed indoors for 24 hours, the unbonded portions of the stainless steel plate and the flat display tape 10 were sandwiched at AUTOGRAPH (Universal Testing Machine; AG-IS Shimadzu Manufacturing Co., Ltd.) at a speed of 300 mm/min. The peel strength of the flat display tape 10 and the stainless steel plate was measured by applying a force in a direction of 180 degrees (peeling direction) along the bonding surface of the stainless steel plate. The larger the measured value, the higher the adhesion.

3. Tensile strength test

The adhesive layer (single layer structure) having a thickness of 100 μm was punched out into a dumbbell-shaped test piece No. 3, and both ends of the test piece obtained by punching were clamped on an AUTOGRAPH (Universal Testing Machine; manufactured by AG-IS Shimadzu Manufacturing Co., Ltd.). The tensile strength was measured at a speed of 300 mm/min, and the tensile strength at 25% elongation and 1000% elongation was measured. The tensile strength at an elongation of 25% is a general criterion for judging the followability to the joint surface of the flat display 20 or the joint surface of the body 30, and the tensile strength at an elongation of 1000% is used as an interface for judging rework. A general basis for peelability and difficulty in rupture. The higher the tensile strength, the higher the modulus of elasticity.

4. DuPont impact test

First, a rectangular chemically strengthened glass (Gorilla Glass manufactured by Corning Incorporated) having a thickness of 0.7 mm, a longitudinal length of 50 mm, and a lateral length of 100 mm was prepared. A frame portion is formed on the peripheral portion of one of the one side of the glass by black screen printing. Then, the flat display tape 10 having a bandwidth of A0.5 mm was adhered to the entire circumference of the frame portion of the glass.

Next, a square transparent polycarbonate sheet having a thickness of 3 mm, a longitudinal length of 100 mm, and a lateral length of 100 mm was prepared, and the polycarbonate sheet was formed with a circular hole of 10 mm at the center. A polycarbonate sheet was laminated on a flat display tape 10 on a chemically strengthened glass. That is, the flat-panel display tape 10 having a width of 0.5 mm was placed on the peripheral portion of the plate of the chemically strengthened glass of 50 mm × 100 mm, and the plate of the chemically strengthened glass and the polycarbonate plate were bonded together with the tape 10 for the flat display. In the joined state, it was clamped for 30 seconds with a clamping force of 1 MPa.

After that, use the DuPont impact tester (TESTER Industry Limited) The company system) conducted an impact test. After the chemically strengthened glass and the polycarbonate sheet in the joined state were cooled at minus 20 ° C for 2 hours, the chemically strengthened glass was placed horizontally below, and the weight receiving jig was inserted into the hole of the polycarbonate sheet. A weight of 300 g was dropped on the weight receiving jig to apply an impact to the chemically strengthened glass. The height (falling distance) of the weight when the chemically strengthened glass plate was peeled off from the polycarbonate sheet due to the impact was measured. That is to say, the higher the height of the weight, the higher the impact resistance.

5. Air leak test

First, a rectangular chemically strengthened glass (Gorilla Glass manufactured by Corning Incorporated) having a thickness of 0.7 mm, a longitudinal length of 50 mm, and a lateral length of 100 mm was prepared. A frame portion is formed on the peripheral portion of one of the one side of the glass by black screen printing. Then, the flat display tape 10 having a bandwidth of A0.5 mm was adhered to the entire circumference of the frame portion of the glass.

Next, a square transparent polycarbonate sheet having a thickness of 3 mm, a longitudinal length of 100 mm, and a lateral length of 100 mm was prepared, and the polycarbonate sheet was formed with a circular hole of 10 mm at the center. A polycarbonate sheet was laminated on a flat display tape 10 on a chemically strengthened glass. In this engaged state, it is clamped for 30 seconds with a clamping force of 1 MPa.

A rubber plug to which an air hose is attached is used to plug the circular hole of the polycarbonate sheet in an airtight state, and in this state, the chemically strengthened glass and the polycarbonate sheet are placed in water, in chemically strengthened glass and polycarbonate sheet. An air pressure of 0.02 MPa was applied between them to confirm whether the air leaked from the joint portion, and the test time was up to 12 minutes. That is to say, the longer the time, the higher the water resistance. This air pressure corresponds to the water pressure at a water depth of 2 m.

In Table 1, the comparison shows the basic test results of the tape 10 for flat panel display of the embodiment of the present invention and the basic test results of Comparative Example 1.

In Table 2, the results of tests conducted by die-cutting the flat-panel display tape 10 of the embodiment of the present invention into a predetermined shape and die-cutting to a width of 0.5 mm are shown, and the test results of Comparative Example 1 are shown in comparison. Comparative example 1 The width of the general foamed substrate tape was set to 1.0 mm.

[Example 1]

56 parts by weight of a styrene-butadiene-styrene copolymer, so-called SBS (D-1118 manufactured by Kraton), and 44 parts by weight of SBS (TR2601 manufactured by JSR Co., Ltd.), and a terpene phenol resin as a tackifier. 50 parts by weight of YS Polyster T-115 (YASUHARA CHEMICAL CO., LTD.), 10 parts by weight of oil (LBR-305 manufactured by Kura Co., Ltd.), and 1 part by weight of an antioxidant (IRGANOX 1010 manufactured by Ciba Japan Co., Ltd.) were dissolved in toluene. Among them, a binder solution having a solid content of 40% by weight was prepared.

The adhesive solution was applied onto a 38 μm PET separation membrane (manufactured by SBK-1 Fujico Co., Ltd.) using an applicator, and the binder solution was dried to have a dry film thickness of 100 μm to prepare a single sheet. A layer of tape is used to bond two sheets of single-layer tape together to form a 200 μm tape without a substrate.

The surface roughness of the adhesive layer was measured by the method described above, and as a result, Ra was 0.05 μm and Rz was 1.3 μm , and a very smooth adhesive surface was obtained.

Next, the peel strength of 180 degrees was measured by the method of the above 2, and as a result, the peel strength was 65 N, and sufficient joint strength was obtained.

The tensile strength at 25% elongation and 1000% elongation was also measured according to the method of the above 3, and as a result, the tensile strength at an elongation of 25% was 1.0 MPa, and the tensile strength at an elongation of 1000% was 5.5. MPa, although the adhesive layer is soft, it is not easy to bend, and it is not easy to be broken by pulling with a finger.

The flat panel display tape 10 of Example 1 was punched out into a frame shape having a width A of 0.5 mm and an outer circumference of 50 mm × 100 mm, and an impact test was carried out by the above method. As a result, chemical strengthening was performed before the height of the weight reached 40 cm. None of the glass was peeled off from the polycarbonate sheet, and when the weight reached 40 cm, the chemically strengthened glass was broken. That is to say, sufficient joint strength can be obtained.

According to the test method of the above 5, the air leakage test was carried out using the flat display tape 10 of Example 1, and as a result, air pressure was applied within 12 minutes, but no air bubbles were observed in the water.

[Example 2]

80 parts by weight of a styrene-butadiene-styrene copolymer, so-called SBS (D-1118 manufactured by Kraton), 10 parts by weight of SBS (TR2601 manufactured by JSR Co., Ltd.), and 10 parts by weight of SBS (D-1170BT manufactured by Kraton) And 50 parts by weight of terpene phenolic resin (YS Polyhast Chemical Co., Ltd. YS Polyster T-115) as a tackifier, 10 parts by weight of oil (LBR-305 manufactured by Kuraray Co., Ltd.), and antioxidant (Ciba Japan shares) 1 part by weight of IRGANOX 1010) was dissolved in toluene to prepare a binder solution having a solid content of 40% by weight.

The above adhesive solution was applied to both sides of a 38 μm easy-adhering PET film (A-4300 Toyobo Co., Ltd.) by an applicator to make a dry film thickness of 100 μm, and a 38 μm PET separation membrane (SBK-1 Fujico Co., Ltd.) The film was sandwiched between the separation film by a rubber roller, and a tape 10 for a flat display having a multilayer structure having an adhesive layer on both surfaces of the substrate was produced.

The surface roughness of the adhesive layer was measured in the same manner as in Example 1. As a result, Ra was 0.03 μm and Rz was 1.0 μm , and a very smooth adhesive surface was obtained.

Next, the peel strength of 180 degrees was measured, and as a result, the peel strength was 58 N, and sufficient joint strength was obtained. The tensile strength at an elongation of 25% and an elongation of 1000% was also measured, and as a result, the tensile strength at an elongation of 25% was 0.6 MPa, and the tensile strength at an elongation of 1000% was 3.5 MPa, although the adhesive layer was It is soft but not easy to bend, and it is not easy to break with fingers.

The flat panel display of Example 2 was punched out into a frame shape having a width A of 0.5 mm and an outer circumference of 50 mm × 100 mm, and an impact test was carried out by the above-described method. As a result, chemical strengthening was performed before the height of the weight reached 40 cm. None of the glass was peeled off from the polycarbonate sheet, and when the weight reached 40 cm, the chemically strengthened glass was broken. That is to say, sufficient joint strength can be obtained.

A gas leak test was also performed, and as a result, air pressure was applied within 12 minutes, but no air bubbles were found in the water.

[Example 3]

A styrene-butadiene-styrene copolymer, so-called SBS (D-1118 manufactured by Kraton), 56 parts by weight and SBS (JSR Co., Ltd.) at a temperature of 130 ° C using a resin roller (manufactured by KANSAI ROLL Co., Ltd.) 44 parts by weight of TR2601) and a terpene phenolic resin (YS Polytera T-115, manufactured by YASUHARA CHEMICAL CO., LTD.) as a tackifier, 50 parts by weight, oil (manufactured by Kura Co., Ltd.) LBR-305) 10 parts by weight of an antioxidant (IRGANOX 1010 manufactured by Ciba Japan Co., Ltd.) was kneaded in an amount of 1 part by weight to obtain a resin block.

The resin block was dissolved in an organic solvent and coated to obtain a tape having a 180-degree peel strength and a 25%, 1000% tensile strength which was the same as that of Example 1.

The adhesive composition was placed in a hot melt spreader (manufactured by DP300S Co., Ltd., manufactured by SUNTOOL Co., Ltd.), and melted at a temperature of 150 °C. Using the spreader, the adhesive composition was applied at a nozzle speed of 10 mm/sec along the outer periphery of the chemically strengthened glass so that the width of the applied adhesive composition was 0.7 mm and the adhesive composed from the chemically strengthened glass coated surface was composed. The height of the object is 300 μm , and as a result, the binder composition solidifies immediately under the heat absorption of the chemically strengthened glass and the environment. The cured adhesive composition becomes the tape 10 for flat display.

Next, the surface roughness of the highest portion of the flat display tape 10 was measured in the same manner as in Example 1. As a result, Ra was 0.08 μm and Rz was 1.4 μm . The same results as in Example 1 were obtained in the impact test and the gas leak test.

[Embodiment 4]

80 parts by weight of a styrene-butadiene-styrene copolymer, so-called SBS (D-1118 manufactured by Kraton), 10 parts by weight of SBS (TR2601 manufactured by JSR Co., Ltd.) and SBS (manufactured by Kraton) at a temperature of 130 °C 10 parts by weight of D-1170BT), and 50 parts by weight of a terpene phenol resin (YS Polyhast Chemical Co., Ltd. YS Polyster T-115) as a tackifier, and 10 parts by weight of oil (LBR-305 manufactured by Kuraray Co., Ltd.) anti- 1 part by weight of an oxidizing agent (IRGANOX 1010, manufactured by Ciba Japan Co., Ltd.) was kneaded to obtain a resin block.

The resin block was dissolved in an organic solvent and coated to obtain a tape having a 180-degree peel strength and a 25%, 1000% tensile strength which was the same as that of Example 2.

A frame shape corresponding to the frame shape of the chemically strengthened glass was engraved on the circumferential surface of a metal rotating cylinder (gravure printing apparatus) having a diameter of 20 cm, and the frame shape had a depth of 400 μm and a width of 3 mm.

The hot-melt pan and the cylinder were heated to 160 ° C, and the kneaded resin block was placed to melt the resin block as a whole.

An easy-bond PET A-4300 with a thickness of 38 μm was prepared as a film-like substrate, and the melted adhesive composition was printed on both sides of the substrate to obtain a single-sided film thickness of 210 μm and a double-sided film thickness of 420 μ. Print of m. This printed matter becomes the tape 10 for flat display.

Next, the surface roughness of the highest position of the flat display tape 10 was measured in the same manner as in Example 1. As a result, Ra was 0.05 μm and Rz was 1.4 μm . The same results as in Example 1 were obtained in the impact test and the gas leak test.

[Comparative Example 1]

Prepared a commercially available foam-coated double-sided tape for mobile devices (#57125 total thickness 250 μm , PE foam substrate thickness 200 μm , single-sided adhesive layer thickness 25 μm , manufactured by Nitto Denko Corporation) ). The foaming substrate double-sided tape for the mobile device uses a paper separation membrane. The surface roughness of the adhesive layer of the foamed base material double-sided tape for a mobile device was measured in the same manner as in Example 1. As a result, Ra was 1.3 μm and Rz was 17.0 μm , and the surface of the adhesive layer was low in smoothness. After the double-sided tape of the foaming substrate for the mobile device is adhered to the smooth surface, it takes a certain curing time to make the whole contact.

The peel strength test was carried out in the same manner as in Example 1. As a result, the peel strength was low and was 20 N.

The width of the double-coated tape for the foaming substrate for the mobile device was set to 1.0 mm, and after molding into a frame shape in the same manner as in Example 1, the Dupont impact test of the above 4 was carried out, and when the weight height was 16 cm, the glass plate was peeled off. It is.

Further, a gas leakage test was conducted in the same manner as in Example 1. As a result, bubbles appeared two minutes after the start of the test. This is considered to be because the foam substrate is soft and the physical force is weak and cannot withstand the air pressure.

The above embodiments are merely examples in all respects and are not to be construed as limiting. Further, variations or modifications within the equivalent scope of the patent range are included in the scope of the invention.

[Industrial Availability]

As described above, the flat panel display tape of the present invention can be used, for example, for bonding a flat display of an electronic device and a body.

1‧‧‧Smart mobile phone

10‧‧‧Panel for flat panel display

20‧‧‧ flat panel display

30‧‧‧ body

Claims (6)

A flat panel display tape for bonding a flat panel display and a body, wherein the flat panel display is formed of a tape having a width of 0.7 mm or less and having an adhesive layer bonded to a joint surface of the flat display, the adhesive layer The thickness of the adhesive layer is set to be 100 μm or more, and the surface roughness of the above-mentioned adhesive layer is 0.1 μm or less in terms of arithmetic mean roughness and 1.5 μm or less in terms of ten-point average roughness. The tape for a flat-panel display according to claim 1, wherein when the adhesive layer formed to have a thickness of 100 μm and a width of 25 mm is attached to the surface of the stainless steel plate, the 180-degree peel strength is 50 N or more, and the peeling state is When the interface was peeled off and the adhesive layer having a thickness of 100 μm was tested with a dumbbell-shaped No. 3 test piece, the tensile strength at an elongation of 25% was in the range of 0.5 MPa to 1.0 MPa. The tape for a flat panel display according to claim 1, wherein the tape has a bonding strength, that is, a tape having a width of 0.5 mm is disposed between peripheral portions of two sheets of 50 mm × 100 mm, The two sheets of the sheet were joined by a tape, and the two sheets were horizontally arranged and fixed to the upper sheet while being cooled to minus 20 ° C, when the weight of the DuPont-type impact test 300 g was dropped. In the case of a square plate, the lower plate is not peeled off from the upper plate until the falling distance of the weight reaches 30 cm. The tape for a flat display according to the item 1 of the present invention, wherein the adhesive layer having a thickness of 100 μm is tested with a dumbbell-shaped test piece No. 3, and the tensile strength at an elongation of 1000% is 3.0 MPa or more and 6.0 MPa. Within the scope below. The tape for a flat panel display according to the above aspect, wherein the composition of the adhesive layer is a composition in which a weight ratio of the elastomer to the tackifier is in a range of 1/0.3 or more and 1/1 or less, the elastomer It is a styrene elastomer and is reversible. The tape for a flat-panel display according to claim 1, wherein the flat-panel display tape is produced by any one of the following methods, that is, a method of forming the adhesive layer by a coating method and then cutting into a predetermined shape, the coating The method uses a fluidity adhesive to cover the object to be coated; a method of applying a fluidity adhesive to form the adhesive layer of a predetermined shape by using a spreader; and printing a fluidity adhesive on the object to be printed. A method of defining the above-described adhesive layer in a shape.