KR102152249B1 - Adhesive sheet for display and display comprising the same - Google Patents

Abstract

It relates to the adhesive sheet for a display of the present invention, and more particularly, it is possible to prevent the generation of static electricity through antistatic treatment, the defect rate is significantly lowered as the surface resistance is low, excellent heat resistance, and does not cause discoloration. At the same time, the present invention relates to an adhesive sheet for a display and a display including the same, which has excellent adhesion to a display device and has a low reduction rate of adhesion even after being left in high temperature and high humidity conditions.

Description

Adhesive sheet for display and display including the same {Adhesive sheet for display and display comprising the same}

It relates to the adhesive sheet for a display of the present invention, and more particularly, it is possible to prevent the generation of static electricity through antistatic treatment, the defect rate is significantly lowered as the surface resistance is low, excellent heat resistance, and does not cause discoloration. At the same time, the present invention relates to an adhesive sheet for a display and a display including the same, which has excellent adhesion to a display device and has a low reduction rate of adhesion even after being left in high temperature and high humidity conditions.

Recently, with the rapid development of information and communication technology and the expansion of the market, flat panel displays are in the spotlight as display devices. Such a flat panel display device is a liquid crystal display device. Typical examples are plasma display panels and organic light emitting diodes.

Organic light-emitting devices have advantages such as fast response speed, light and thin, low power consumption, self-luminous devices, and flexibility, and thus demand for next-generation display devices, displays as well as lighting is increasing.

The organic light emitting device is formed by depositing a transparent electrode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, and a metal electrode in the order of a glass substrate, and electrons and holes supplied from both electrodes are recombined in the organic light emitting layer. It is the principle of emitting light using the emitted energy.

Since organic light-emitting devices can be deteriorated by external factors such as external moisture, oxygen, or ultraviolet rays, a packaging technology that seals the organic light-emitting device is important, and for application to various applications, the organic light-emitting display device is manufactured thinly. Is required to be.

Meanwhile, the lower portion of the display device includes an adhesive sheet for protecting the display device from external force and preventing the generation of static electricity. The conventional adhesive sheet for a display did not prevent the generation of static electricity, and the adhesive strength with the display device is poor. there was.

Accordingly, the generation of static electricity can be prevented through antistatic treatment, and the defect rate is significantly lowered due to low surface resistance, excellent heat resistance, no discoloration, and excellent adhesion to the display device, high temperature and Research on an adhesive sheet for displays with a low decrease in adhesive strength even after leaving it under high humidity conditions is urgent.

KR 10-0252953 B1 (Registration date: 2000.01.21)

The present invention has been devised to solve the above-described problems, it is possible to prevent the generation of static electricity through antistatic treatment, the defect rate is significantly lowered as the surface resistance is low, excellent heat resistance, and at the same time does not cause discoloration. , An object of the present invention is to provide an adhesive sheet for a display and a display including the same, which has excellent adhesion with a display device and has a low reduction rate of adhesion even after being left in high temperature and high humidity conditions.

In order to solve the above-described problems, the present invention comprises a base material and a cationic salt comprising a nitrogen onium salt formed on the upper surface of the base material, a main resin and a solid state at 25°C, and having a substituted or unsubstituted aryl group. A base film comprising an adhesive layer formed through a composition having an antistatic agent; including, wherein the adhesive layer provides an adhesive sheet for a display having a rate of change of surface resistance of less than 30% according to Equation 1 below.

[Equation 1]

In this case, a is the initial surface resistance (Ω) of the adhesive layer measured under a voltage of 10V, and b is a surface resistance measured at 5 minute intervals for 15 minutes under a temperature of 220°C and a voltage of 10V, and this is repeated 4 times. In this case, the difference with the initial surface resistance is the maximum value of the surface resistance change over time.

According to an embodiment of the present invention, the antistatic agent may include a cationic salt represented by Formula 1 below.

[Formula 1]

In Formula 1, R ¹ , R ² , and R ³ are each independently a C ₁ to C ₄ straight chain or a C ₃ to C ₅ branched alkyl group.

In addition, the antistatic agent may include a cationic salt represented by the following formula (2).

[Formula 2]

In addition, the antistatic agent is ^{Cl -, Br -, I -} , AlCl 4 -, Al 2 Cl 7 -, BF 4 -, PF 6 -, ClO 4 -, NO 3 -, CH 3 COO -, CF 3 COO - ^{_{, CH 3 SO 3 -, CF}} 3 SO 3 -, (CF 3 SO 2) 2 N -, (CF 3 SO 2) 3 C -, AsF 6 -, SbF 6 -, NbF 6 -, TaF 6 -, ( _{^{CN) 2 N -, C 4}} F 9 SO 3 -, (C 2 F 5 SO 2) 2 N -, C 3 F 7 COO -, (FSO 2) 2 N -, (CF 3 SO 2) (CF 3 CO)N ^- and N (SO ₂ F) ₂ ^- It may further include an anionic salt containing at least one selected from the group consisting of.

In addition, the antistatic agent may be a compound represented by the following formula (3).

[Formula 3]

In addition, the composition may contain 0.01 to 5 parts by weight of the antistatic agent based on 100 parts by weight of the main resin.

In addition, the adhesive layer may have a rate of change of the surface resistance according to Equation 1 within 26%.

In addition, the adhesive layer may have a surface resistance of 2.1×10 ¹⁰ to 2.3×10 ¹³ Ω.

In addition, the adhesive layer may have a surface resistance change over time measured by the following measurement method of 1.5×10 ¹⁰ to 2.96×10 ¹³ Ω.

[How to measure]

Surface resistance is measured at intervals of 5 minutes for 15 minutes under the condition of temperature 220℃ and voltage of 10V, and this is repeated 4 times to measure the change over time of surface resistance.

In addition, the main resin may be an acrylic copolymer.

In addition, at least one surface of the substrate may be antistatically treated.

In addition, it may include; a release film provided on the upper surface of the adhesive layer and adhered by the adhesive layer, one surface is antistatic treatment.

In addition, the lower surface of the release film may be subjected to silicone release treatment.

In addition, the release force between the base film and the release film may be 1 to 7 gf/in.

In addition, the base film may have a transmittance of 88% or more, and a haze of 0.5 to 2.0%.

In addition, the base film may have an adhesive strength of 1,300 gf/in or more as measured by the following measurement method.

[How to measure]

The adhesive strength when the base film was attached to the glass and peeled by 180° at a speed of 5 mm per second after 24 hours elapsed was measured.

Meanwhile, the present invention provides a display including the above-described base film.

The adhesive sheet for a display and a display including the same according to the present invention can prevent the generation of static electricity through antistatic treatment, and the defect rate is significantly reduced due to low surface resistance, excellent heat resistance, and no discoloration occurs. , The adhesive strength with the display device is excellent, and the reduction rate of the adhesive force is low even after being left in high temperature and high humidity conditions.

1 is a cross-sectional view of an adhesive sheet for a display according to an embodiment of the present invention,
2 is an exploded cross-sectional view of an adhesive sheet for a display according to an embodiment of the present invention, and
3 is a schematic cross-sectional view of a display according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. The present invention may be implemented in various different forms, and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention, and the same reference numerals are added to the same or similar components throughout the specification.

The adhesive sheet for a display according to an embodiment of the present invention, as shown in FIG. 1, a base film 120 including a substrate 122 and an adhesive layer 121 formed on the upper surface of the substrate 122 ); includes.

Hereinafter, each configuration provided in the adhesive sheet for display will be described in detail.

First, the base film 120 will be described.

The base film 120 is directly attached to the display to protect the lower portion of the display and to support the device.

The base film 120 is implemented by including a substrate 122 and an adhesive layer 121 formed on the upper surface of the substrate 122 as described above.

At this time, the adhesive layer 121 may have a rate of change of surface resistance of less than 30% according to Equation 1 below, and preferably, a rate of change of surface resistance of less than 26% .

[Equation 1]

In this case, a is the initial surface resistance (Ω) of the adhesive layer measured under a voltage of 10V, and b is a surface resistance measured at 5 minute intervals for 15 minutes under a temperature of 220°C and a voltage of 10V, and this is repeated 4 times. In this case, the difference with the initial surface resistance is the maximum value of the surface resistance change over time.

If the rate of change of the surface resistance exceeds 30%, the heat resistance of the base film 120 may be poor due to the non-uniform surface resistance.

On the other hand, the adhesive layer 121 is formed through a composition containing a main resin and an antistatic agent.

The main resin may be used without limitation, as long as it is a resin that can be used to form an adhesive layer having sufficient adhesive strength in the art, and preferably may be an acrylic copolymer.

In addition, the antistatic agent may be a solid antistatic agent at 25°C, and the antistatic agent may include a cationic salt and further include an anionic salt. As the antistatic agent is a solid antistatic agent at 25°C, the adhesive strength of the base film 120 is excellent, the appropriate surface resistance can be maintained, and the effect of a low reduction rate of adhesive force can be expressed even after being left in high temperature and high humidity conditions. have.

The cationic salt of the antistatic agent includes a nitrogen onium salt having a substituted or unsubstituted aryl group, and may preferably be a cationic salt represented by the following formula (1), more preferably a cationic salt represented by the following formula (2). I can.

[Formula 1]

In Formula 1, R ¹ , R ² , and R ³ are each independently a C ₁ to C ₄ straight chain or a C ₃ to C ₅ branched alkyl group.

[Formula 2]

Further, the anionic salts of the antistatic agent is ^{Cl -, Br -, I -} , AlCl 4 -, Al 2 Cl 7 -, BF 4 -, PF 6 -, ClO 4 -, NO 3 -, CH 3 COO -, _{^{CF 3 COO -, CH 3 SO}} 3 -, CF 3 SO 3 -, (CF 3 SO 2) 2 N -, (CF 3 SO 2) 3 C -, AsF 6 -, SbF 6 -, NbF 6 -, TaF _{^{6 -, (CN) 2 N}} -, C 4 F 9 SO 3 -, (C 2 F 5 SO 2) 2 N -, C 3 F 7 COO -, (FSO 2) 2 N -, (CF 3 SO 2 ) (CF ₃ CO) N ^- and N (SO ₂ F) ₂ ^- may be possible to include one or more selected from the group, and preferably consisting of _{^{PF 6 -, BF 4 -,}} I - , and (CF ₃ SO ₂ ) ₂ N ^- may include one or more selected from the group consisting of.

In addition, most preferably, the antistatic agent may be a compound represented by the following formula (3).

[Formula 3]

The composition may include 0.01 to 5 parts by weight, preferably 0.1 to 4.5 parts by weight, of the antistatic agent based on 100 parts by weight of the main resin. If the antistatic agent is less than 0.01 parts by weight with respect to 100 parts by weight of the main resin, an electrical short may occur, and a problem of increasing surface resistance and peeling voltage may occur. If it exceeds 5 parts by weight, the base film 120 Adhesion may be lowered, and a problem may occur in that adhesion is significantly lowered after being left in high temperature and high humidity conditions.

Meanwhile, the adhesive layer 121 may have a surface resistance of 2.1×10 ¹⁰ to 2.3×10 ¹³ Ω, and preferably 4.1×10 ¹⁰ to 1.3×10 ¹³ Ω. If the surface resistance is less than 2.1×10 ¹⁰ Ω, the adhesive strength of the base film 120 may decrease due to excessive inclusion of an antistatic agent, and if it exceeds 2.3×10 ¹³ Ω, the defective rate may increase. .

In addition, the adhesive layer 121 has a surface resistance change value of 1.5×10 ¹⁰ to 2.96×10 ¹³ Ω, preferably a surface resistance change value of 3.1×10 ¹⁰ to 1.62×10 May be ¹³ Ω. If the surface resistance change over time value is less than 1.5×10 ¹⁰ Ω or exceeds 2.96×10 ¹³ Ω, the heat resistance of the base film 120 may be poor due to non-uniform surface resistance.

In addition, the thickness of the adhesive layer 121 is not limited as long as it is the thickness of the adhesive layer included in the adhesive sheet, and may be preferably 10 to 30 μm, and more preferably 11 to 27 μm.

In addition, the substrate 122 may be used without limitation as long as it is a material that can be used for an adhesive sheet normally in the art, and preferably may be a PET substrate. In addition, the thickness of the substrate 122 is not limited as long as it is a thickness of a substrate that can be used for a conventional adhesive sheet, preferably 50 to 150 μm, more preferably 70 to 130 μm.

On the other hand, the substrate 122 included in the base film 120 according to the present invention may be treated with antistatic treatment on at least one surface, preferably on the lower surface, in order to prevent the generation of static electricity. Static electricity generation can be prevented through antistatic treatment.

The base film 120 may have a transmittance of 88% or more, preferably a transmittance of 90% or more, and more preferably a transmittance of 91% or more. In addition, the base film 120 may have a haze of 0.5 to 2%, preferably 0.7 to 1.5%. If the base film 120 does not satisfy the transmittance range and the haze range, the recognition rate may decrease during attachment and the defect rate may increase.

In addition, the adhesive strength of the base film 120 must be sufficiently high so that the adhesive sheet formed under the display does not peel off, and preferably, the base film has an adhesive force measured by the following measurement method of 1,300 gf/in or more, more preferably The adhesive strength may be 1,400 gf/in or more.

[How to measure]

The adhesive strength when the base film was attached to the glass and peeled by 180° at a speed of 5 mm per second after 24 hours elapsed was measured.

If the adhesive force of the base film 120 measured by the above measurement method is less than 1,300 gf/in, there may be a problem that the base film 120 is peeled off from the display.

On the other hand, the adhesive sheet for a display according to an embodiment of the present invention is provided on the upper surface of the adhesive layer 121 and adhered by the adhesive layer 121, a release film 110 having one surface antistatic treatment; It is implemented including.

The release film 110 serves to protect the base film 120. The adhesive sheet for a display according to the present invention may be applied to the display and attached. In this case, the release film 110 may be peeled first, and then the base film 120 may be attached to the display. At this time, the release force of the release film 110 may be 1 to 7 gf/in, more preferably 2 to 6 gf/in. If the release force of the release film 110 is less than 1 gf/in, the release film cannot be easily protected from the base film 120 as the release film is excessively peeled even with a small physical stimulus from the base film 120, and is 7 gf/in. If it exceeds in, peeling is not easy when applied to a display, and thus the defective rate may increase.

As shown in FIG. 2, in order for the release film 110 to exhibit the release force as described above, the lower surface of the release film 110 may be subjected to a release treatment (A). The release treatment may be used without limitation as long as it is a material commonly used for release treatment in the art, and preferably, release treatment with silicone may exhibit an appropriate level of release power.

On the other hand, the release film 110 according to the present invention may be treated with antistatic treatment on at least one side, preferably the top and bottom surfaces, in order to prevent the generation of static electricity. Static electricity generation can be prevented through antistatic treatment.

The release film 110 may be used without limitation as long as it is a material commonly used in a release film in the art, and preferably may be a PET substrate. In addition, the thickness of the release film 110 is not limited as long as it is a thickness of a release film that can be used in an adhesive sheet, preferably 30 to 90 µm, more preferably 35 to 85 µm, but is limited thereto. It doesn't work.

The above-described display adhesive sheet may be manufactured through a manufacturing method described later, but is not limited thereto, and the same parts as those of the above-described display adhesive sheet will be omitted and described.

The pressure-sensitive adhesive sheet for a display according to the present invention comprises the steps of forming a temporary adhesive layer by applying a composition including a main resin and an antistatic agent on the upper surface of the substrate 122; Laminating the release film 110 on the upper surface of the base material 122 on which the temporary adhesive layer is formed and curing the temporary adhesive layer to prepare the laminated release film 110 and the base film 120; including Can be manufactured.

First, a description will be given of a step of forming a temporary adhesive layer by applying a composition including a main resin and an antistatic agent on the upper surface of the substrate 122.

The composition includes a main resin and an antistatic agent, and may further include a curing agent and a solvent.

The main resin may have a weight average molecular weight of 200,000 to 1,000,000, and preferably, a weight average molecular weight of 400,000 to 800,000.

In addition, the curing agent may be used without limitation, as long as it is a curing agent that can be used to form an adhesive layer that generally exhibits sufficient adhesive strength, preferably an epoxy curing agent, and more preferably an epoxy amine curing agent, Even more preferably, it may be N,N,N,N'-tetraglycidyl-m-xylenediamine. The curing agent may be included in an amount of 0.02 to 0.35 parts by weight, preferably 0.05 to 0.3 parts by weight, based on 100 parts by weight of the main resin. If the content of the curing agent is less than 0.02 parts by weight based on 100 parts by weight of the main resin, the adhesive layer may not be cured to the desired level, and if it exceeds 0.35 parts by weight, the adhesive layer is overcured and the adhesive strength is lowered. Can occur.

In addition, the solvent can be used without limitation, as long as it is a solvent that can be used in the adhesive composition forming the adhesive layer, and preferably, an aqueous solvent, alcohol solvent, ketone solvent, amine solvent, ester solvent, acetate system It may contain at least one selected from the group consisting of a solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent, more preferably an alcohol solvent, a ketone solvent, an amine solvent, or an ester solvent. It may include one or more selected from the group consisting of a solvent, an acetate-based solvent, and an ether-based solvent, and most preferably methyl ethyl ketone. The solvent may be included in 20 to 60 parts by weight, preferably 25 to 55 parts by weight, based on 100 parts by weight of the main resin, but is not limited thereto.

Next, about the step of laminating the release film 110 on the upper surface of the base material 122 on which the temporary adhesive layer is formed and curing the temporary adhesive layer to prepare the laminated release film 110 and the base film 120 Explain.

The method of laminating the release film 110 on the upper surface of the base material 122 on which the temporary adhesive layer is formed may be used without limitation, provided that it is a method and/or condition commonly used in the art, preferably at room temperature. It may be laminated using a roll laminator, but is not limited thereto.

In addition, the curing may be used without limitation as long as it is a curing condition for forming an adhesive layer commonly used in the art, preferably at 30 to 80°C for 30 to 60 hours, more preferably at 40 to 70°C. It can be cured for 40 to 55 hours, but is not limited thereto.

Meanwhile, the present invention includes a display implemented including the above-described base film.

As shown in Fig. 3, the base film 120" may be attached to the lower portion of the display 300. Specifically, it includes an adhesive layer 121" having sufficient adhesive strength and a substrate 122" that protects the display. By including the base film 120", it is possible to protect the lower portion of the display and prevent static electricity from being generated in the display device.

The adhesive sheet for a display and a display including the same according to the present invention can prevent the generation of static electricity through antistatic treatment, and the defect rate is significantly reduced due to low surface resistance, excellent heat resistance, and no discoloration occurs. , The adhesive strength with the display device is excellent, and the reduction rate of the adhesive force is low even after being left in high temperature and high humidity conditions.

The present invention will be described in more detail through the following examples, but the following examples do not limit the scope of the present invention, which should be interpreted to aid understanding of the present invention.

<Example 1>

A copolymer having a weight average molecular weight of 600,000 as a main resin and randomly copolymerized with acrylic acid, butyl acrylate, ethyl acrylate, and vinyl acetate is N,N,N,N'-tetra as a curing agent based on 100 parts by weight of the main resin. A composition was prepared by mixing 0.22 parts by weight of glycidyl-m-xylenediamine, 4.25 parts by weight of a compound represented by the following Formula 3 in a solid state at 25° C. as an antistatic agent, and 39 parts by weight of methyl ethyl ketone as a solvent.

And, on the upper surface of the antistatically treated substrate by applying a thin film of PEDOT/PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) to the lower surface of the 75㎛-thick PET substrate, the composition To form a temporary adhesive layer, and apply a thin film of PEDOT/PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) to the upper and lower surfaces of the 75㎛-thick PET substrate to prevent antistatic treatment. , After applying a thin film of a silicone release agent on the lower surface, placing the lower surface of the silicone release-treated release film in contact with the temporary adhesive layer, laminated at room temperature using a roll laminator, and cured at 50° C. for 48 hours, with a thickness of 14 A base film having a µm adhesive layer formed thereon and a release film laminated on the upper surface of the base film were prepared.

[Formula 3]

<Examples 2 to 5>

Preparation was carried out in the same manner as in Example 1, but by changing the content of the antistatic agent, an adhesive sheet for display as shown in Table 1 was prepared.

<Comparative Example 1>

Prepared in the same manner as in Example 1, but represented by the following formula 4 as an antistatic agent, N-hexyl-4-methylpyridinium hexafluorophosphate (N-hexyl-4-methylpyridinium hexafluorophosphate, which is a liquid at 25°C, CAS no. 929897-32-5) was carried out in the same manner as in Example 1 to prepare an adhesive sheet for a display.

[Formula 4]

<Comparative Examples 2 to 5>

It was prepared in the same manner as in Comparative Example 1, but the content of the liquid antistatic agent represented by Chemical Formula 4 was changed at 25°C to prepare an adhesive sheet for display as shown in Table 2.

< Experimental example 1>

1. Initial surface resistance measurement

A two-point probe connected to a surface resistance meter (TREK 152-1, TREK, INC.) after cutting the adhesive sheet for display according to the Examples and Comparative Examples into 200 mm x 350 mm and peeling the release film of the cut adhesive sheet. (152P-2P, TREK, INC.) was contacted with the adhesive layer to measure the initial surface resistance. This is shown in Table 1 and Table 2 below.

2. Evaluation of change rate of surface resistance

After cutting to 200mm×350mm from the adhesive sheet for a display prepared according to Examples and Comparative Examples and peeling the release film of the cut adhesive sheet, a surface resistance meter (TREK 152-1, TREK , INC.) connected 2 point probe (152P-2P, TREK, INC.) in contact with the adhesive layer to measure the surface resistance at 5 minute intervals for 15 minutes, and when repeated 4 times, the surface resistance changes with time After measuring the value, the surface resistance change over time at which the difference with the surface resistance becomes the maximum was measured, and then the rate of change of the surface resistance was calculated according to Equation 1 below. This is shown in Table 1 and Table 2 below.

[Equation 1]

In this case, a denotes the measured initial surface resistance, and b denotes a change in surface resistance over time at which the difference with the surface resistance becomes maximum.

3. Adhesive layer Discoloration evaluation

After attaching the base film of the adhesive sheet for display prepared according to the Examples and Comparative Examples to a non-alkali glass with a roll laminator, left at a temperature of 220°C for 5 minutes, and then evaluate the discoloration of the adhesive layer through the naked eye. I did. This is shown in Table 1 and Table 2 below.

< Experimental example 2>

1. Release film Release force , Base film adhesion measurement and Separation band voltage evaluation

With respect to the display adhesive sheet prepared according to the Examples and Comparative Examples, the display adhesive sheet was cut to a width of 1 inch, and then peeled at 180° at a speed of 40 mm per second to measure the release film release force, and the display adhesive sheet was After removing the release film by cutting it into 1 inch width, the surface was attached to the cleaned glass, and after 24 hours, the adhesive strength of the adhesive layer was measured by peeling at 180° at a speed of 5 mm per second. Then, after cutting the adhesive sheet for display into 100×100 mm, the release film was peeled at 180° at a rate of 80 mm per second, and the peeling band voltage (V) of the adhesive layer was measured. This was repeated 5 times, and the average value was 0.05kV or less-○, when it exceeded 0.05kV-to evaluate the peeling band voltage. This is shown in Table 1 and Table 2 below.

2. Evaluation of adhesive performance of adhesive sheet for display

Attaching the base film of the adhesive sheet for a display prepared according to the Examples and Comparative Examples to the lower part of the display with a roll laminator at room temperature, and after 24 hours elapsed, allowed to stand for 500 hours under conditions of a temperature of 60°C and a humidity of 90%. As a method of checking whether a peeling phenomenon occurred on the lower adhesive sheet, the adhesion performance of the base film was evaluated by setting the peeling phenomenon to-○, and the peeling phenomenon to occur-×. This is shown in Table 1 and Table 2 below.

3. Measure the rate of change of adhesion after leaving it in high temperature and high humidity conditions

Attach the base film of the adhesive sheet for a display prepared according to Examples and Comparative Examples to non-alkali glass, and leave it for 500 hours at a temperature of 60°C and 95% relative humidity, and then stand sufficiently at room temperature. After that, the base film was peeled at a speed of 5 mm per second and 180° to measure the adhesive strength of the adhesive layer, and based on the initial adhesive strength of each of 100%, the rate of change of the adhesive force was measured. If the rate of change of adhesive force satisfies the range of ± 20%-○, if not satisfied-was set as ×. This is shown in Table 1 and Table 2 below.

division Example
One Example
2 Example
3 Example
4 Example
5 Antistatic agent Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Content (parts by weight) 4.25 0.005 0.5 2 7 Surface resistance (Ω) 4.3×10 ¹⁰ 3.2×10 ¹³ 7.2×10 ¹² 3.3×10 ¹¹ 8.8×10 ⁹ Change rate of surface resistance (%) 24.6 23.3 23.6 24.1 26.9 Discoloration evaluation radish radish radish radish radish Release film release force (gf/in) 3.5 8.2 5.9 3.4 0.8 Base film adhesion (gf/in) 1489 1712 1665 1589 550 Peeling band voltage of adhesive layer ○ × ○ ○ ○ Evaluation of adhesive performance of adhesive sheet for display ○ ○ ○ ○ × Adhesion change rate after leaving in high temperature and high humidity conditions ○ ○ ○ ○ ×

division Comparative example
One Comparative example
2 Comparative example
3 Comparative example
4 Comparative example
5 Antistatic agent Kinds Formula 4 Formula 4 Formula 4 Formula 4 Formula 4 Content (parts by weight) 4.25 0.005 0.5 2 7 Surface resistance (Ω) 6.3×10 ¹⁰ 3.8×10 ¹³ 8.6×10 ¹² 3.2×10 ¹¹ 9.2×10 ⁹ Change rate of surface resistance (%) 123.4 90.4 68.9 156.7 132.4 Discoloration evaluation U radish U U U Release film release force (gf/in) 1.3 9.1 7.2 9.4 13.8 Base film adhesion (gf/in) 613 1521 1410 1290 490 Peeling band voltage of adhesive layer ○ × × ○ ○ Evaluation of adhesive performance of adhesive sheet for display × ○ ○ × × Adhesion change rate after leaving in high temperature and high humidity conditions × ○ ○ × ×

As can be seen in Tables 1 and 2,

Examples 1, 3 and 4 satisfying all types and contents of the antistatic agent according to the present invention, and the surface resistance and peeling voltage compared to Examples 2, 5 and Comparative Examples 1 to 5, which are omitted at least one of them. It is low, and as the rate of change of surface resistance is low, it has excellent heat resistance, does not cause discoloration of the adhesive layer, and the release power of the release film is adequate, and the adhesive strength of the base film and the adhesive performance evaluation result of the adhesive sheet for display are excellent. It can be seen that even after being left in high temperature and high humidity conditions, the effect of low change in adhesive strength can be achieved at the same time.

Although an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiment presented in the present specification, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same idea. It will be possible to easily propose other embodiments by changing, deleting, adding, etc., but it will be said that this is also within the scope of the present invention.

110,111: release film
120,120',120": base film
121,121',121": adhesive layer
122,122',122": description
300: display

Claims (17)

An adhesive layer formed through a composition comprising a substrate and a cationic salt including a base resin and a nitrogen onium salt having a substituted or unsubstituted aryl group in a solid state at 25° C. and formed on the upper surface of the substrate Including; a base film comprising a,
The composition contains 0.01 to 5 parts by weight of the antistatic agent based on 100 parts by weight of the main resin,
The adhesive layer is an adhesive sheet for a display having a rate of change of surface resistance of less than 30% according to Equation 1 below:
[Equation 1]

In this case, a is the initial surface resistance (Ω) of the adhesive layer measured under a voltage of 10V, and b is a surface resistance (Ω) measured at intervals of 5 minutes for 15 minutes under the condition of a temperature of 220°C and a voltage of 10V, and this is 4 When repeated twice, the difference with the initial surface resistance is the maximum value of the surface resistance change over time. The method of claim 1,
The antistatic agent is an adhesive sheet for a display comprising a cationic salt represented by the following Formula 1:
[Formula 1]

In Formula 1, R ¹ , R ² , and R ³ are each independently a C ₁ to C ₄ straight chain or a C ₃ to C ₅ branched alkyl group. The method of claim 1,
The antistatic agent is an adhesive sheet for a display comprising a cationic salt represented by the following Formula 2:
[Formula 2]

The method of claim 1,
The antistatic agent is ^{Cl -, Br -, I -} , AlCl 4 -, Al 2 Cl 7 -, BF 4 -, PF 6 -, ClO 4 -, NO 3 -, CH 3 COO -, CF 3 COO -, CH _{^{3 SO 3 -, CF 3 SO}} 3 -, (CF 3 SO 2) 2 N -, (CF 3 SO 2) 3 C -, AsF 6 -, SbF 6 -, NbF 6 -, TaF 6 -, (CN) _{^{2 N -, C 4 F 9}} SO 3 -, (C 2 F 5 SO 2) 2 N -, C 3 F 7 COO -, (FSO 2) 2 N -, (CF 3 SO 2) (CF 3 CO) The adhesive sheet for a display further comprises an anionic salt containing at least one selected from the group consisting of N ^- and N (SO ₂ F) ₂ ^- . The method of claim 1,
The antistatic agent is a display adhesive sheet of a compound represented by the following formula (3):
[Formula 3]

delete The method of claim 1,
The adhesive layer is an adhesive sheet for a display having a rate of change of the surface resistance according to Equation 1 within 26%. The method of claim 1,
The adhesive layer is an adhesive sheet for a display having an initial surface resistance of the adhesive layer and a surface resistance of 2.1×10 ¹⁰ ~ 2.3×10 ¹³ Ω measured at 5 minute intervals for 15 minutes under conditions of 220°C and voltage 10V. The method of claim 1,
The adhesive layer has a surface resistance change over time measured by the following measurement method: 1.5×10 ¹⁰ ~ 2.96×10 ¹³ Ω Display adhesive sheet:
[How to measure]
Surface resistance is measured at intervals of 5 minutes for 15 minutes under the condition of temperature 220℃ and voltage 10V, and this is repeated 4 times to measure the change over time of surface resistance. The method of claim 1,
The main resin is an acrylic copolymer adhesive sheet for display. The method of claim 1,
The substrate is an adhesive sheet for a display on which at least one surface is antistatic. The method of claim 1,
A release film provided on the upper surface of the adhesive layer and adhered by the adhesive layer, and having an antistatic treatment on one surface thereof. The method of claim 12,
The release film is an adhesive sheet for a display having a silicon release treatment on the lower surface thereof. The method of claim 12,
A display adhesive sheet having a release force between the base film and the release film of 1 to 7 gf/in. The method of claim 1,
The base film has a transmittance of 88% or more, and a haze of 0.5 to 2% for a display adhesive sheet. The method of claim 1,
The base film is an adhesive sheet for a display having an adhesive force of 1,300 gf/in or more measured by the following measuring method:
[How to measure]
The adhesive strength when the base film was attached to the glass and peeled by 180° at a speed of 5 mm per second after 24 hours elapsed was measured. A display comprising the adhesive sheet for a display according to any one of claims 1 to 5 and 7 to 16.

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