KR20160143250A - Heat Peeling Tape with Excellent Reworkability for Display Glass - Google Patents

Abstract

A tape for electrical and electronic components according to the present invention comprises adhesive layers on both sides of a substrate (10) and further comprises an electrically conductive adhesive layer (20) formed on one side thereof and an electrically non-conductive adhesive layer (30) formed on the other side thereof, wherein the adhesive layers (20, 30) are formed by coating an acrylic copolymer resin composition comprising butyl acrylate, 2-hydroxyethyl acrylate (HEA), acrylic acid, rosin ester, and other additives. Release liners (40, 50) are attached to an outer side of the adhesive layers (20, 30). For the substrate (10), copper foil, PET, PP. PE, aluminum, synthetic resin film and the like can be used. Preferably, the substrate layer (10) is 5-40 m, the adhesive layers (20, 30) are each 2-30 m, and the release liners (40, 50) are each 10-100 m. The tape of the present invention when heated at 40-90C for 5-15 minutes has its adhesive strength decreased to 60-90% of its initial adhesive strength and recovers its initial adhesive strength after being at room temperature for 30 minutes to one hour.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat peeling tape for a display glass having improved reworkability,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape used in a display glass such as a display, a smart phone, a computer, a notebook computer, a television, and the like. More specifically, the present invention relates to a tape that facilitates rework and can restore the original adhesive strength after reworking is completed.

Various tapes are used in the manufacturing stage of electrical and electronic products such as displays, smart phones, computers, notebooks, and televisions. This tape is a double-sided tape having release liner on both sides, and it may be necessary to separate the tape once attached. For example, there may be a case in which a tape is detached by attaching a tape having a strong adhesive force. In some cases, it is necessary to detach a tape attached to a product for repair or other A / S. It is necessary to remove the attached tape to perform a predetermined required operation, and the separated tape is reattached to be reused, which is referred to as rework.

However, many problems arise when reworking the tape. There is a problem in that the tape is not easily separated due to strong adhesive force when the tape is first separated. If the tape is not well separated, the part to which the tape was attached may be damaged during the separation process. For example, when a tape is attached to a display glass part, the glass part may be broken to make the product irrevocable. In addition, there is a problem that when the tape is separated, the adhesive layer is separated or migrated and the adhesive force is weakened when the tape is reattached.

Korean Patent No. 1169361 discloses a tape for a display panel having improved reworkability, which is a tape comprising a base layer, an adhesive layer, and an embossed liner layer, wherein an acrylic polymer containing a carboxyl group and a hydroxyl group is used as an adhesive layer Thereby improving the re-workability and increasing the late adhesion after reworking. However, the tape of this patent may be useful when reworking within a short time after attaching the tape, but it can not be used because it retains strong adhesive force in case of A / S such as repair for a long time.

The present inventors have come to develop new tapes of the present invention which solve all the conventional problems of tapes due to reworking so that reworking is easy in any case and the adhesive force can be restored to the original adhesive force after reworking .

It is an object of the present invention to provide a new tape which is easy to rework a tape used in display glass of electric and electronic products.

Another object of the present invention is to provide a new tape in which the adhesive strength is lowered by about 60 to 90% of the initial adhesive strength at a wide range of temperatures of 40 to 90 캜, and thus the attached tape is easily separated to facilitate rework.

It is still another object of the present invention to provide a tape which can restore the original adhesive force when the tape is left at room temperature for 30 minutes to 1 hour after reworking is completed.

It is still another object of the present invention to provide a tape that not only facilitates reworking but also can solve the problem of breakage of a product that may occur during reworking.

And to provide the above and other objects of the present invention.

The tape for electro-magnetic materials according to the present invention is formed by forming an adhesive layer on both sides of a substrate 10, and an electroconductive adhesive layer 20 is formed on one side and a nonconductive adhesive layer 30 is formed on the other side. And the adhesive layers 20 and 30 are formed by applying an acrylic copolymer resin composition comprising butyl acrylate, 2-hydroxyethyl acrylate (HEA), acrylic acid, rosin ester, and other additives do.

A release liner 40, 50 is attached to the outside of the adhesive layer 20, 30.

Copper foil, PET, PP, PE, aluminum, synthetic resin film, or the like can be used as the base material 10, and electromagnetic wave shielding effect (EMI) can be expected when copper foil is used.

Wherein the adhesive layers 20 and 30 comprise acrylic copolymer comprising 35 to 45% by weight of butyl acrylate, 30 to 40% by weight of HEA, 3 to 5% by weight of acrylic acid, 20 to 30% by weight of rosin ester and 1 to 2% A resin composition is preferable. A conductive material may be added to the electrically conductive adhesive layer 20. Examples of the additives include plasticizers, elastomers, and the like, which can be easily practiced by those skilled in the art.

The base layer 10 may have a thickness of 1.4 to 500 μm and the adhesive layers 20 and 30 may each have a thickness of 2 to 300 μm. Preferably, the base layer 10 is 5 to 40 占 퐉, the adhesive layers 20 and 30 are 2 to 35 占 퐉, and the release liner 40 and 50 are respectively 10 to 100 占 퐉.

When the tape of the present invention is heated at 40 to 90 ° C for 5 to 15 minutes, the adhesive force of 60 to 90% is lower than that of the initial adhesive force, and the initial adhesive strength is restored after 30 minutes to 1 hour at room temperature.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape for use in display glass of various electric and electronic products, and has an adhesive strength of about 60 to 90% of an initial adhesive strength at a temperature of 40 to 90 DEG C, , A new tape capable of recovering the original adhesive force when the tape is left at room temperature for 30 minutes to 1 hour after the reworking is completed, and to solve the problem of breakage of the product that may occur during reworking .

1 is a schematic cross-sectional view of a tape according to the present invention.
2 is a graph showing the change in adhesive force according to the standing time at room temperature after heating at 50 DEG C for 600 seconds.
3 is a graph showing changes in adhesive force with time at room temperature after heating at 60 DEG C for 600 seconds.
4 is a graph showing a change in adhesive force according to a standing time at room temperature after heating at 70 DEG C for 600 seconds.
5 is a graph showing changes in adhesive force with time at room temperature after heating at 80 DEG C for 600 seconds.
6 is a graph showing an EMI shielding effect of a tape using a copper foil as the base material 10. Fig.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape used in a display glass such as a display, a smart phone, a computer, a notebook computer, a television, and the like. The tape can easily rework and re- .

The tape for electro-magnetic materials according to the present invention is formed by forming an adhesive layer on both sides of a substrate 10, and an electroconductive adhesive layer 20 is formed on one side and a nonconductive adhesive layer 30 is formed on the other side. And the release liner (40, 50) is attached to the outside of the adhesive layer (20, 30). The release liner 40, 50 is affixed to protect the tape until the tape is used and is removed when the tape is in use. 1 is a schematic cross-sectional view of a tape according to the present invention.

Copper foil, PET, PP, PE, aluminum, synthetic resin film, or the like can be used as the base material 10, and electromagnetic wave shielding effect (EMI) can be expected when copper foil is used. 6 is a graph showing the EMI shielding effect of a tape using a copper foil as the base material 10.

The adhesive layers 20 and 30 are formed by applying an acrylic copolymer resin composition comprising butyl acrylate, 2-hydroxyethyl acrylate (HEA), acrylic acid, rosin ester, and other additives.

Wherein the adhesive layers 20 and 30 comprise acrylic copolymer comprising 35 to 45% by weight of butyl acrylate, 30 to 40% by weight of HEA, 3 to 5% by weight of acrylic acid, 20 to 30% by weight of rosin ester and 1 to 2% A resin composition is preferable. A conductive material may be added to the electrically conductive adhesive layer 20. Examples of the additives include plasticizers, elastomers, and the like, which can be easily practiced by those skilled in the art.

The acrylic copolymer resin composition for forming the adhesive layers 20 and 30 is prepared by sieving the raw materials in a sieve analyzer having a size of about 300 meshes and preliminarily mixing with a pressure-sensitive adhesive, adding catalysts and additives to secondary mix, And the mixture is homogenized by a tertiary mixing process. The method for producing the acrylic copolymer resin composition can be easily carried out by those skilled in the art.

The acrylic copolymer resin composition is coated on both sides of the substrate 10 to form adhesive layers 20 and 30. And can be coated using coating equipment such as a comma, a gravure, and a slot die (lip). After the coating is completed, the release liner (40, 50) is attached to the adhesive layer (20, 30) through an aging process to complete the tape manufacturing.

The thickness of the tape composed of the base layer 10 and the adhesive layers 20 and 30 can be variously varied from several 탆 to several hundred 탆. The base layer 10 may have a thickness of 1.4 to 500 μm and the adhesive layers 20 and 30 may each have a thickness of 2 to 300 μm. Preferably, the base layer 10 is 5 to 40 占 퐉, the adhesive layers 20 and 30 are 2 to 35 占 퐉, and the release liner 40 and 50 are respectively 10 to 100 占 퐉.

When the tape of the present invention is heated at 40 to 90 ° C for 5 to 15 minutes at a relatively wide range of temperatures, the adhesive force of 60 to 90% of the initial adhesive force is lowered. When the tape is further heated at room temperature for 30 minutes to 1 hour, Recover. When heat is applied in the above temperature range, the adhesive force is lowered to 60 ~ 90% of the initial adhesive force. Therefore, the tape can be easily separated for reworking, and when the tape is reattached, Since the adhesive strength is restored, there is no problem in adhesive force even if reworking is performed.

The present invention will be illustrated by the following examples, which should not be construed as limiting or limiting the scope of the present invention.

Example

Tape Fabrication: A copper foil having a thickness of 20 mu m was used as the substrate 10, and the adhesive layers 20 and 30 were made of 40 wt% of butylacrylate, 32 wt% of HEA, 4 wt% of acrylic acid, 22 wt% of rosin ester, By weight and an elastomer in an amount of 1% by weight was applied by a gravure method. After aging, the release liner (40, 50) was attached to produce a tape according to the present invention.

Example  One

Three samples of the tape samples prepared above were prepared and allowed to stand at room temperature for 30 minutes. Then, the peel adhesive force of the A side was measured, and after heating for 60 seconds at 50 DEG C, , 180 seconds, 300 seconds, 3,600 seconds). The measurement was carried out in accordance with KS T-1028. The measurement results are shown in Table 1, and the graph for Sample 1 (# 1) is shown in FIG.

Peel Adhesive Before and After Heating
Adhesion (g / f) #One #2 # 3 After standing at room temperature for 30 minutes 2,080 2,110 1,980 Heat at 50 ℃ for 600 seconds


After 30 seconds 590 550 550 After 60 seconds 690 660 640 After 180 seconds 1,150 1,100 1,130 After 300 seconds 1,640 1,670 1,610 After 3,600 seconds 1,930 1,940 1,990

Example  2

The same procedure as in Example 1 was conducted except that the sample was heated at 60 占 폚 for 600 seconds. The measurement results are shown in Table 2 below, and the graph for Sample 1 (# 1) is shown in FIG.

Peel Adhesive Before and After Heating
Adhesion (g / f) #One #2 # 3 After standing at room temperature for 30 minutes 2,080 2,110 1,980 Heating at 60 ℃ for 600 seconds


After 30 seconds 540 520 550 After 60 seconds 520 550 570 After 180 seconds 870 800 880 After 300 seconds 1,440 1,470 1,500 After 3,600 seconds 1,930 1,990 1,920

Example  3

And the mixture was heated at 70 DEG C for 600 seconds. The measurement results are shown in Table 3 below, and the graph of Sample 1 (# 1) is shown in FIG.

Peel Adhesive Before and After Heating
Adhesion (g / f) #One #2 # 3 After standing at room temperature for 30 minutes 2,080 2,110 1,980 Heating at 70 ℃ for 600 seconds


After 30 seconds 220 280 310 After 60 seconds 230 290 330 After 180 seconds 400 460 430 After 300 seconds 500 530 510 After 3,600 seconds 1,950 1,970 1,910

Example  4

The same procedure as in Example 1 was conducted except that the sample was heated at 60 占 폚 for 600 seconds. The measurement results are shown in Table 4, and the graph of Sample 1 (# 1) is shown in FIG.

Peel Adhesive Before and After Heating
Adhesion (g / f) #One #2 # 3 After standing at room temperature for 30 minutes 2,080 2,110 1,980 Heating at 80 ℃ for 600 seconds


After 30 seconds 220 250 250 After 60 seconds 270 260 250 After 180 seconds 320 320 330 After 300 seconds 620 650 670 After 3,600 seconds 1,900 1,910 1,940

As can be seen from the above example, when heat is applied in the temperature range, the adhesive force of the tape is significantly lowered compared to the initial adhesive force, and the initial adhesive force is recovered as time elapses.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

A substrate 10; And
An adhesive layer (20, 30) formed on both sides of the substrate;
Lt; / RTI >
Wherein the adhesive layers 20 and 30 are formed by applying an acrylic copolymer resin composition comprising butyl acrylate, 2-hydroxyethyl acrylate (HEA), acrylic acid, rosin ester, and an additive Tapes for electronic and electrical materials.
The tape according to claim 1, further comprising a release liner (40, 50) attached to the outside of the adhesive layer (20, 30).
The tape according to claim 1 or 2, wherein the base material (10) is a copper foil, PET, PP, PE, aluminum, or a synthetic resin.
The adhesive layer according to claim 1 or 2, wherein the adhesive layer comprises from 35 to 45% by weight of butyl acrylate, from 30 to 40% by weight of HEA, from 3 to 5% by weight of acrylic acid, from 20 to 30% by weight of rosin ester, And 1 to 2% by weight of an additive.
The tape for electronic and electric materials according to claim 4, wherein the additive is a plasticizer, an elastomer, a conductive material, a catalyst, or a mixture of two or more thereof.
The tape according to claim 4, characterized in that the base layer (10) has a thickness of 5 to 40 탆, the adhesive layers (20,30) each have a thickness of 2 to 35 탆, and the release liner (40, 50) For electrical and electronic materials.
The adhesive tape according to claim 4, wherein when the tape is heated at 40 to 90 ° C for 5 to 15 minutes, the adhesive force is reduced to 60 to 90% of the initial adhesive force, and the initial adhesive force is restored after 30 minutes to 1 hour at room temperature Wherein the tape is made of a metal.

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