KR101821980B1 - Foam adhesive tape for bonding the display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a foamed foam adhesive tape for use in a display, and more particularly, to a foamed foam adhesive tape for use in attaching components such as a display panel to an electronic apparatus, To a foamed foam adhesive tape for display adhesion, which is excellent in adhesion property and is easy to remove a foam tape from a display panel and easily rework when a display panel is removed from an electronic device during assembly process and rework is required .

Description

{Foam adhesive tape for bonding the display panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a foamed foam adhesive tape for use in a display, and more particularly, to a foamed foam adhesive tape for use in attaching components such as a display panel to an electronic apparatus, To a foamed foam adhesive tape for display adhesion, which is excellent in adhesion property and is easy to remove a foam tape from a display panel and easily rework when a display panel is removed from an electronic device during assembly process and rework is required .

Generally, an LCD display module is widely applied to an electronic device display panel. In the LCD module, a guide panel is placed under a bare assembly, and various optical sheets, LGPs, reflector films, LED housings (LEDs) And a cover bottom is placed on the lowermost end. A backlight (lamp or LED) is housed and fixed by various fixing brackets such as a fixer to provide a light source for a display.

Here, in order to reduce the manufacturing costs of the LCD backlight by minimizing various fixing brackets for attaching the display panel such as LCD, etc., a technique of assembling a display panel that is slimmed by using a thin adhesive tape is generally known.

However, since the display panel and the guide panel, which are adherend adherends, have different thermal expansions according to the inner heat of the display module and the temperature change due to the external heat, both sides of the adhesive boundary line interposed therebetween relax and contract with different amounts of deformation An adhesive tape for a display panel is applied so that the adhesive force of the adhesive surface is reduced to cause lifting or a problem that tearing occurs due to the shear force generated between the adhesive tape and the adhesive tape.

As a conventional adhesive tape for display bonding, Korean Patent Registration No. 10-1204906 discloses an adhesive tape for a display, which is divided at a central portion in a width direction of a tape, And a first side wing portion and a second side wing portion which are respectively partitioned on both widthwise sides of the center fixing portion, wherein the first side wing portion and the second side wing portion are spaced apart from each other by a predetermined interval There has been proposed an adhesive tape in which a plurality of cut-away portions dividing the wings are formed, but this is an invention characterized by a structure for use of adhesive tape and maintenance of physical properties after application.

In addition, Korean Patent No. 10-0964618 discloses a pressure-sensitive adhesive tape which is easy to maintain the adhesive force at a high temperature, ensure reliability under constant temperature and humidity conditions, stable in a working process, and clean work, and includes a polymer foam foam, And a pressure-sensitive adhesive layer formed on both sides of the surface-modifying adhesive layer, wherein the surface-modifying adhesive layer is formed on both sides of the surface-modifying adhesive layer. However, when the present invention is applied to bonding an electronic device to a display, it is necessary to rework during the manufacturing process. When the display is to be removed, the foamed foam layer is cut in the lateral direction by a knife to separate the display panel and the backlight unit And then remove the tape portion remaining on the display panel to reuse the expensive display. Therefore, it is difficult to remove residues of the adhesive foam remaining on the display panel, and it is troublesome to remove the residue by using a solvent to remove it.

As described above, in an electronic device, a display panel essentially functions as a double-sided tape. When a display panel is inevitably removed and reused after reattaching after attaching the display panel to an electronic device, It is very important that the tape is easy to remove, and little research has been done on it. This is probably due to adherence to the existing method of simply removing it with a solvent or the like.

However, in relation to the reworkability of foamed foam adhesive tape in the process of attaching electronic devices and display panels, the removal of foamed foamed adhesive tape in the reworking process, which is very common during the assembly process, It is a very important process. Therefore, it is very important and urgent to develop a foamed foam adhesive tape which can easily remove the adhesive tape from the display panel during rework while maintaining the physical properties of the foamed foam adhesive tape.

1. Korean Patent No. 10-1204906 2. Korean Patent No. 10-0964618

In order to solve the problems of the prior art as described above, the present invention provides a foamed foam adhesive tape for adhering an electronic device display panel to a conventional electronic device, while retaining the inherent properties of the adhesive tape, So that the adhesive tape can be easily removed.

Accordingly, an object of the present invention is to provide a foamed foamed adhesive tape having physical properties that can easily remove an adhesive tape during rework after separating a display panel while maintaining the inherent physical properties of an adhesive tape useful for bonding an electronic device display panel .

Another object of the present invention is to provide an adhesive tape which is excellent in initial adhesion force and long-term adhesive force of adhesive surface to be adhered to an adherend, and adhesion force between members and is excellent in removing adhesive tape from a portion adhered to a display panel, And a foamed foam adhesive tape.

In order to solve the problems of the present invention, the present invention provides a foamed foam sheet comprising a polymer foamed foam sheet layer, a first patterned adhesive layer formed on a first surface of the foam sheet layer, And a second patterned adhesive layer formed on the surface of the second patterned adhesive layer.

According to another preferred embodiment of the present invention, there is further provided a foamed foam adhesive tape for display panel bonding, further comprising a protective film layer between the second surface of the foam sheet layer and the adhesive layer or the second patterned adhesive layer .

According to another preferred embodiment of the present invention, there is provided a foamed foam adhesive tape for display panel adhesion, further comprising a primer adhesive layer between the second surface of the foam sheet layer and the protective film layer.

According to another preferred embodiment of the present invention, a primer adhesive layer and a protective film layer are additionally provided between the first surface of the foam sheet layer and the first pattern adhesive layer, and the second surface of the foam sheet layer There is provided a foamed foam adhesive tape for a display panel, further comprising a primer adhesive layer and a protective film layer between the adhesive layer and the second pattern adhesive layer.

The foamed foam adhesive tape for a display adhering according to the present invention may be configured to include a patterned adhesive layer on one side of a foam sheet layer unlike a conventional foamed foam adhesive tape, It is necessary to remove the foamed foam adhesive tape from the display panel after the display panel is detached from the electronic device and the foamed foamed adhesive tape can be cleanly removed without leaving any residue So that the reworking process is very simple and easy.

Further, in the present invention, when the foamed foam is removed from the display panel during the rework as described above, the foamed foam adhesive tape is removed simply by removing it with a hand without using any other tool or solvent, There is an advantage that it is easy and there is no surface image of the display panel after the removal.

Particularly, according to the present invention, when a protective film layer is applied to one side or both sides of the foamed foam sheet layer, the rigidity of the foamed foamed material of the foamed foam sheet layer can be compensated for and the physical properties adapted to the pressure- And the work process can be further facilitated during rework.

FIG. 1 is a view showing a cross-sectional structure of a foamed foam adhesive tape as an embodiment of the simplest basic structure according to an embodiment of the present invention.
2 is a sectional view of a foamed foam adhesive tape having a protective film layer on one side of a foam sheet layer in addition to the constitution of FIG. 1 according to another embodiment of the present invention.
3 is a cross-sectional view of a foamed foam adhesive tape having a primer adhesive layer and a protective film layer on one side of a foam sheet layer in addition to the configuration of FIG. 1, according to another embodiment of the present invention to be.
4 is a cross-sectional view of a foamed foam adhesive tape further comprising a primer sticking layer and a protective film layer on both sides of the foam sheet layer in addition to the constitution of FIG. 1 according to another embodiment of the present invention FIG.
5 is a view showing an embodiment of application of a pattern structure of a pattern adhesive layer according to the present invention.
6 is a view showing another embodiment of application of the pattern structure of the pattern adhesive layer according to the present invention.
7 is a cross-sectional view showing examples (A) - (D) of various forms of a structure in which a complementary material layer is additionally formed in a foamed foam adhesive tape structure shown in an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail as an embodiment.

The present invention relates to a foamed foam adhesive tape for adhering an electronic device display panel to a foamed foam sheet, which has inherent physical properties of the adhesive tape, And a pattern adhesive layer having a pattern structure on one side of the layer.

The present invention relates to a double-sided adhesive tape applied for adhesion between a display panel and an adhered portion of an electronic device in a process of attaching and assembling a display panel in an electronic device.

A preferred basic structure of the present invention is an adhesive tape having a cross-sectional structure as shown in FIG. 1, which comprises a polymer foamed foam sheet layer 100 and a first foamed foam sheet layer 100 formed on a first surface of the foam sheet layer 100, A pattern adhesive layer 10 and an adhesive layer 20 or a second patterned adhesive layer 21 formed on a second surface of the other side of the foam sheet layer .

The foamed foam adhesive tape of the present invention is characterized in that the first patterned adhesive layer 10 formed on the first surface is adhered to the display panel portion and the adhesive layer 20 or the second patterned adhesive layer (21) is adhered to a backlight unit or the like which is an adherend of another electronic device. In the present invention, a conventional adhesive layer 20 may be applied to a side surface of a backing unit other than an adhesive portion of a display panel, and a second pattern adhesive layer 21) may be applied. However, in the case of the second pattern adhesive layer 21, it is more preferable for the purpose of the present invention to use the adhesive layer 21 having excellent adhesive force as compared with the first pattern adhesive layer 10.

According to another preferred embodiment of the present invention, a protective film layer 30 is additionally provided between the second surface of the foam sheet layer 100 and the adhesive layer 20 or the second patterned adhesive layer 21 And a foamed foam adhesive tape for adhering a display panel. An example of such a configuration is shown in FIG.

Herein, the protective film layer 30 may be further applied to impart the rigidity of the foamed foam sheet layer 100. For example, a synthetic resin film such as polyethylene terephthalate (PET), molyurethane (PU) may be used, A material having excellent compatibility with the foamed foam sheet layer 100 may be applied in the form of a film.

According to another preferred embodiment of the present invention, a foaming foam adhesive for display panel bonding further comprising a primer adhesive layer (40) between the second surface of the foam sheet layer (100) and the protective film layer (30) Tape. An example of such a configuration is shown in FIG.

The application of this primer adhesive layer 40 can be further applied to enhance the adhesion between the foam sheet layer 100 and the protective film layer 30 by adding a primer layer to the foamed foam sheet layer 100 will be.

According to another preferred embodiment of the present invention, a primer sticking layer 40a and a protective film layer 30a are additionally provided between the first surface of the foam sheet layer 100 and the first pattern sticking layer 10 , And further comprising a primer adhesive layer (40) and a protective film layer (30) between the second surface of the foam sheet layer and the adhesive layer (20) or the second pattern adhesive layer (21) And foamed foam adhesive tape. An implementation of this configuration is shown in FIG.

Such a configuration will help to enhance the rigidity of the foamed foam sheet layer 100 as described above, and to maintain the adhesion strength without changing the physical properties, even after the bonding, due to the difference in thermal strain between the display panel and the adherend. In addition, the adhesive tape can be removed more safely and easily from the display panel during reworking.

On the other hand, when the foamed foam is used as the base material of the adhesive tape in the present invention, the foam sheet layer 100 has low rigidity. When the ordinary foam adhesive tape is attached and removed, the foam may be torn, so that the foam may not be completely removed from the display panel. In order to compensate for this, a reinforcing material layer 50 having a high rigidity on the foam surface is further formed on one side surface of the first surface or both side surfaces of the first and second surfaces with the foamed foam sheet layer 100 as a center So that the rigidity of the base material can be compensated. As an example, in FIG. 7, embodiments in which the reinforcing material layer 50 is additionally formed on the first surface (upper layer) of the foamed foam sheet layer 100 as described above are shown to be able to complement the rigidity. The embodiments of FIG. 7 are similar to the foamed foam adhesive tape shown in the embodiment of FIGS. 1 to 4 except that the complementary material layer 50 and the primer adhesive layer 40 are additionally formed. D).

According to the present invention, the reinforcing material layer 50 may be a film-like material made of a rigid material such as a PU skin film, a nonwoven fabric, or a fiber material. As the complementary material layer 50, a primer adhesive layer using an ordinary adhesive may also be applied.

According to the present invention, it is preferable that the bonding force between the foam sheet layer 100 and the reinforcing material layer 50 in FIG. 7 is weaker than the adhesion force between the adherend and the reinforcing material layer 50. In the present invention, since the primer adhesive layer 40 applied to the complementary material layer 50 has a hard characteristic, a large bonding force, which is greater than the bonding force required for bonding the foam sheet layer 100 and the complementary material layer 50 at the beginning, It is preferable to use a pressure sensitive adhesive which can be peeled off with a small force sequentially. According to the present invention, the first patterned adhesive layer 10 in the configuration of FIG. 7 has a function of preventing the removal of the foamed adhesive tape during rework due to the complementary material layer 50 even when a general non-patterned adhesive layer 20 is applied. It is easy.

Generally, when forming a foamed foam adhesive tape, it is necessary to detach the attached display panel by using a foamed foam adhesive tape to remove the adhesive tape from the display panel when rework is required. In this reworking process, The physical properties for improving the reworkability of the adhesive tape are determined by the following characteristics.

(1) Initial adhesion force of the adhesive surface to be adhered to the adherend

(2) Adhesive strength after adhering to the adherend for a long time

(3) Stiffness of the foamed foam adhesive tape base material of the adhesive tape and its bonding strength on the interlayer structure of the base material

(4) There should be no sticky residue on the adhesive tape attached to the display panel.

As described above, in the case of an electronic apparatus having a display panel attached with an adhesive tape, in the case of using a conventional foamed foam adhesive tape, rework is required. When the display panel is to be removed and reworked, The side of the foam sheet of the display panel is cut with a knife to separate electronic parts such as a display panel and a backlight unit and then the foamed foam adhesive tape attached to the display panel is completely removed for reuse of a display panel having a high unit price do. However, in this case, the residue of the foam sheet layer remains on the surface of the display panel and is removed by using a solvent to completely remove the residue. Therefore, the rework process is complicated and it is difficult to remove the adhesive tape residue left on the display panel surface.

According to the present invention, when the foamed foam adhesive tape having the structure of FIG. 1 as described above is used, since the patterned adhesive layer 10 is applied to the first surface of the one side of the foamed foam sheet layer 100, The initial adhesive force of the one-pattern adhesive layer 10 is small and it is very easy to remove the foamed foam adhesive tape from the display panel during reworking. That is, since the first patterned adhesive layer 10 has a small initial adhering force, if it is desired to remove and reuse the adhesive before the display panel is fully adhered to the display panel, The foamed foam sheet layer 100 is completely removed without being left on the surface of the display panel, so that the adhesive tape can be easily removed.

The foamed foam sheet layer 10 to be used in the present invention can be a foamed foamed foam layer which is generally used, for example, preferably polyurethane foam, having a porosity of 60-95% and a density of 70-1,000 kg / m < 2 > can be used. The foamed foam sheet layer 100 may have a thickness of 0.5 to 3.0 mm.

As the pressure-sensitive adhesive component of the first pattern adhesive layer 20 used in the present invention, for example, a polyurethane, a polyester copolymer, or a polyethylene oxide may be used.

In the case of the adhesive layer 30 or the second pattern adhesive layer 21 applied to the first surface of the foam sheet layer 100 according to the present invention, the pressure sensitive adhesive component applied in the first pattern adhesive layer 10 is used Or an epoxy, urethane, polyester copolymer or acrylic adhesive can be used.

According to the present invention, the first patterned adhesive layer 10 is formed in a predetermined pattern shape in order to reduce the initial adhesion force with the surface of the display panel, thereby reducing initial adhesion.

According to a preferred embodiment of the present invention, the shape of the pattern should be easy to remove at a later time, and is preferably applied as a pressure-sensitive adhesive having a viscosity and a flow chart in a form in which the pattern shape is always maintained.

According to a preferred embodiment of the present invention, it is preferable that the size of the pattern shape is designed so as to be proportional to the width of the used tape, so that the adhesive surface: non-adhesive surface is at an area ratio of 3-6: 1 .

According to a preferred embodiment of the present invention, the pattern shape may be formed of stripes, wavy patterns, or a triangular hexagonal pattern.

According to a preferred embodiment of the present invention, in forming the pattern of the first pattern adhesive layer or the second pattern adhesive layer, the line-shaped portion may be formed as a region free of the adhesive.

According to a preferred embodiment of the present invention, the thickness of the first and second pattern adhesive layers 10 and 21 and the adhesive layer 20 may be 30-100 μm, and the primer adhesive layers 40 and 40a And can be applied in a thickness of 2 to 20 mu m.

On the other hand, if the adherend and the display pattern are adhered by using an adhesive tape and then adhered after being left for a long time, the re-work may be difficult to perform without cutting the foam adhesive tape. Therefore, in order to easily remove the foam adhesive tape without damaging the foamed foam adhesive tape on the display panel, when using a general adhesive component, heat should be applied to remove the thermoplastic adhesive when it flows, which may cause thermal damage to the product. In order to compensate this, it is preferable to apply the adhesive layer in a pattern-like manner over the entirety of the pattern adhesive layer in the portion to be adhered to the display panel. However, according to a preferred embodiment of the present invention, a part of the entire area of the pattern adhesive layer is coated with a conventional adhesive agent and the remaining part of the patterned adhesive layer is patterned or patterned using a dicing adhesive or a patterned adhesive A pattern can be formed. In this case, a pattern can be typically constructed in the same manner as in Fig. 5 or Fig. If the first patterned adhesive layer is applied in this manner, if the foamed adhesive tape is to be removed from the display panel for rework, the foamed adhesive tape can be easily removed by weakening the adhesive force after UV irradiation.

5 is a view showing a configuration of the first patterned adhesive layer of the foamed foamed adhesive tape according to the present invention, in which both edge pattern regions of the adhesive tape have a dicing adhesive region in a pattern or non-patterned form, And a patterned adhesive layer of a structure having a region.

6 shows an embodiment according to the constitution of a patterned adhesive layer in which an adhesive portion is repeatedly formed as a dicing pressure sensitive adhesive region pattern region and a non-patterned pressure sensitive adhesive region non-patterned region in constituting the patterned pressure sensitive adhesive layer.

As described above, in the foamed foam adhesive tape for a display adhering according to the present invention, when the display panel is removed from an electronic apparatus and reworked, the foamed foam adhesive tape can be removed without leaving any residue of the foam adhesive tape on the display panel The rework process is very simple and easy. Further, in the case of applying the dicing pressure-sensitive adhesive, it is possible to perform the rework by removing the foam adhesive tape by the UV irradiation method.

As described above, when the foamed foam adhesive to which the patterned adhesive layer according to the present invention is applied is used, only the adhesive tape can be easily removed by hand without using any other tool or solvent during the rework, The adhesive tape is easily removed, and the surface of the display panel is not damaged after the removal. In particular, when the supplementary material layer is further applied, the stiffness of the base material can be compensated for, thereby improving the adhesive property of the display panel and further facilitating the work process in reworking.

Hereinafter, the present invention will be described by way of examples, but the present invention is not limited by the examples.

Example 1

1, a polyurethane foamed foam sheet layer (porosity of 90%, density of 110 kg / m 2, thickness of 1.5 mm) was constituted with the structure shown in Fig. 1 and a square lattice patterned adhesive layer (pressure- A first patterned adhesive layer was formed in a tetragonal lattice pattern and an adhesive layer was formed in a non-patterned pattern on the other side (first surface) to form a foamed foamed adhesive tape. At this time, when the width of the pattern adhesive layer was 2 mm, there were three lattice patterns within a width of 2 mm and a lattice size of 0.8 mm x 0.8 mm.

Example 2

4, a polyurethane film was added as a skin layer to one side (first surface) of the foamed foam sheet layer in addition to the adhesive tape structure having the same structure as that of Example 1 to form a protective film Layer, and a black PET film layer was added to the other side (second surface) to form a protective film layer, respectively, to prepare a foamed foamed adhesive tape.

Comparative Example

An adhesive layer was formed on one side (second surface) of the foamed foam sheet layer in the conventional manner as a foamed foam adhesive tape of the same kind as the adhesive tape to prepare a foamed foamed adhesive tape.

Experimental Example

The display panel was attached to the backlight unit using the same adhesive tape for each of Example 1-2 and Comparative Example with the first surface portion being directed to the display panel portion and the second surface to the surface portion of the backlight unit And the display panel was detached and removed for about 10 minutes and post-work, and then the adhesive tape attached to the display panel was removed to observe remnants. These experiments were repeated 20 times and the number of remnants remaining was checked to confirm the removal rate of the adhesive tape during reworking.

Example 1 Example 2 Comparative Example Total removal rate of adhesive tape (%) 100 100 35

As described above, in the case of the foamed foam adhesive tape according to the present invention, the surface removal rate of the display panel is 100%, which is completely eliminated, whereas the conventional product of the comparative example is about 2/3 (13 out of 20) It has been confirmed that there is a serious problem that the adhesive tape is not completely removed.

10 - first pattern adhesive layer
20 - Adhesive layer
21 - second pattern adhesive layer
30, 30a - protective film layer
40, 40a - primer adhesive layer
50 - Complementary material layer
100 - foamed foam sheet layer
710 - pattern area (or patterned or non-patterned dicing adhesive area)
720 - non-patterned area

Claims (10)

A foamed foam sheet layer, a first patterned adhesive layer formed on a first surface of the foam sheet layer, and an adhesive layer or a second patterned adhesive layer formed on a second surface of the foam sheet layer, And a protective film layer between the second surface of the foam sheet layer and the adhesive layer or the second pattern adhesive layer, wherein the first pattern adhesive layer and the adhesive layer or the second pattern adhesive layer comprise epoxy, urethane, poly Ester copolymer or polyethylene oxide, wherein the first pattern adhesive layer and the second pattern adhesive layer each have an area ratio of an adhesive surface to a non-adhesive surface of 3 to 6: 1 and a thickness of 30 to 100 占 퐉 Wherein the foamed adhesive tape is formed of a thermoplastic resin.
delete The foamed foam adhesive tape according to claim 1, further comprising a primer adhesive layer between the second surface of the foam sheet layer and the protective film layer.
The method according to claim 1, further comprising a primer adhesive layer and a protective film layer between the first surface of the foam sheet layer and the first pattern adhesive layer, wherein the second surface of the foam sheet layer and the adhesive layer or the second pattern adhesive Wherein the adhesive layer further comprises a primer adhesive layer and a protective film layer between the layers.
The foamed foam adhesive tape according to claim 1 or 3, wherein the protective film layer is made of PET or PU.
The method according to claim 1, wherein the foam sheet layer is made of polyurethane and includes a primer adhesive layer and a protective film layer of a polyurethane skin layer between the first surface of the foam sheet layer and the first pattern adhesive layer, And a protective film layer of a black PET film layer between the second surface of the sheet layer and the adhesive layer or the second pattern adhesive layer. The foam sheet according to any one of claims 1 to 4, further comprising a primer adhesive layer and a complementary material layer on one side or both sides of the first surface or the first surface and the second surface of the foam sheet layer Foam foam adhesive tape for display panel.
The foamed foam adhesive tape according to claim 7, wherein the outermost layer of the first surface of the foamed foam sheet layer comprises a first patterned adhesive layer or a conventional adhesive layer.
The display device according to any one of claims 1, 3, 4, and 6, wherein the pattern of the first patterned adhesive layer is a region in which the line- tape.
The foamed foam adhesive tape according to claim 7, wherein the reinforcing material layer is made of a PU skin film or a fibrous material.

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