KR102094917B1 - Adhesive sheet for display and display comprising the same - Google Patents

Abstract

Regarding the adhesive sheet for a display of the present invention, more specifically, it is possible to prevent the generation of static electricity through an antistatic treatment, and at the same time, the defect rate is significantly lowered, corrosion of the adherend does not occur, and the display exhibits excellent adhesion with a display device. It relates to a pressure-sensitive adhesive sheet and a display comprising the same.

Description

Adhesive sheet for display and display including the same

Regarding the adhesive sheet for a display of the present invention, more specifically, it is possible to prevent the generation of static electricity through an antistatic treatment, and at the same time, the defect rate is significantly lowered, corrosion of the adherend does not occur, and the display exhibits excellent adhesion with a display device. It relates to a pressure-sensitive adhesive sheet and a display comprising the same.

2. Description of the Related Art In recent years, flat panel displays have been spotlighted as display devices according to the rapid development of information and communication technologies and the expansion of the market. Such a flat panel display device is a liquid crystal display device (Liquid Crystal Display). Plasma display panels (Plasma Display Panel), organic light-emitting devices (Organic Light Emitting Diodes) and the like are typical.

Organic light-emitting devices have advantages such as fast response speed, light weight, low power consumption, self-light emitting device, and flexibility, and thus, the demand for the next generation display device, display, 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 on a glass substrate, and electrons and holes supplied from both electrodes are recombined in the organic light emitting layer It emits light using the emitted energy.

Since the organic light emitting device may be deteriorated by external factors such as external moisture and oxygen or ultraviolet light, packaging technology for sealing the organic light emitting device is important, and to apply to various applications, the organic light emitting display device is manufactured thinly Is required to be.

On the other hand, the lower portion of the display device includes an adhesive sheet for protecting the display device from external forces and preventing the generation of static electricity. The conventional adhesive sheet for displays did not prevent the generation of static electricity, and the adhesive strength with the display device was not good. there was.

Accordingly, it is urgent to study the adhesive sheet for a display, which can prevent static electricity generation through an antistatic treatment, at the same time significantly lowers the defect rate, does not cause corrosion of the adherend, and has excellent adhesion with a display device.

KR 10-0252953 B1 (Registration date: 2000.01.21)

The present invention has been devised to solve the above-mentioned problems, and it is possible to prevent static electricity generation through antistatic treatment, and at the same time, the defect rate is significantly reduced, corrosion of the adherend does not occur, and the display is excellent in adhesion with a display device. It is an object to provide an adhesive sheet and a display including the same.

In order to solve the above-described problems, the present invention provides a first base material, a first main agent resin having an acid value of 40 to 80 mgKOH / g, and a first antistatic agent at 25 ° C., which is formed on an upper surface of the first base material. A base film comprising a first adhesive layer formed through a first composition comprising; And

A protective film comprising a second adhesive layer adhered to a lower surface of the first substrate and a second substrate formed on a lower surface of the second adhesive layer; wherein the first antistatic agent has a substituted or unsubstituted aryl group It provides an adhesive sheet for a display comprising a cationic salt containing a nitrogen onium salt.

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

[Formula 1]

In Formula 1, R ¹ , R ² , R ³ are each independently a C ₁ ~ C ₄ straight-chain or C ₃ ~ C ₅ pulverized alkyl group.

In addition, the first antistatic agent may include a cationic salt represented by Formula 2 below.

[Formula 2]

In addition, the first antistatic agent is a ^{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 further include an anionic salt comprising one or more selected from the group consisting of.

In addition, the first antistatic agent may be a compound represented by Formula 3 below.

[Formula 3]

In addition, the first composition may include 0.01 to 5 parts by weight of the first antistatic agent with respect to 100 parts by weight of the first agent resin.

In addition, the first topical resin may be an acrylic copolymer.

In addition, the second adhesive layer may be formed through a second composition comprising a second agent resin having an acid value of 35 to 75 mgKOH / g and a second antistatic agent solid at 25 ° C.

In addition, the second composition may include the second antistatic agent in an amount of 0.01 to 2 parts by weight based on 100 parts by weight of the second agent resin.

In addition, the second subject resin may be an acrylic copolymer.

In addition, the first base material and the second base material may be PET substrates.

In addition, at least one surface of the first substrate and the second substrate may be antistatic.

In addition, it is provided on the upper surface of the first adhesive layer is adhered by the first adhesive layer, one side of the anti-static treatment release film; may further include.

In addition, the release surface of the release film may be 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 (Haze) of 0.5 to 2.0%.

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

[How to measure]

The adhesive strength when peeling 180 ° at a rate of 5 mm per second after 24 hours by attaching the base film to glass was measured.

On the other hand, the present invention comprises the steps of peeling the release film from the above-described adhesive sheet for display; Bonding the release film and the base film and the protective film to the display; And peeling the protective film from the adhesive base film and the protective film; provides an application method of the adhesive sheet for a display comprising a.

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

The adhesive sheet for a display according to the present invention and the display including the same can prevent static electricity generation through antistatic treatment, and at the same time, the defect rate is significantly reduced, corrosion of the adherend does not occur, and the adhesive strength with the display device is excellent. have.

1 is a cross-sectional view of the adhesive sheet for a display according to an embodiment of the present invention,
Figure 2 is a separate cross-sectional view of the 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, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. The present invention can be implemented in many 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 elements throughout the specification.

The adhesive sheet for display according to an embodiment of the present invention, as shown in Figure 1, the first base material 122 and the first adhesive layer 121 formed on the top surface of the first base material 122 Including base film 120; And a second adhesive layer 131 adhered to the lower surface of the first base material 122 and a second base layer 132 formed on the lower surface of the second adhesive layer 131. 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 is responsible for supporting the device.

The first adhesive layer 121 is formed through a first composition including a first subject resin and a first antistatic agent.

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

Further, the first topical resin may have an acid value of 40 to 80 mgKOH / g, preferably an acid value of 45 to 75 mgKOH / g. If the acid value of the first agent resin is less than 40 mgKOH / g, the first adhesive layer cannot express a desired level of adhesion, and thus reliability may be deteriorated, and if the acid value exceeds 80 mgKOH / g, it is deposited. Corrosion of ash may occur.

On the other hand, the acid value may be an acid value measured through a method for conventionally measuring the acid value in the art, preferably in accordance with KSM0065, polymer sample (solid content 100%) 0.5g toluene, 2-propanol and distilled water 50 : 49.5: Dissolved in 50 g of a mixed solvent containing a weight ratio of 0.5 to prepare a sample, and can be measured through a 0.1N 2-propanol potassium hydroxide solution.

The first antistatic agent is an antistatic agent that is solid at 25 ° C., and the first antistatic agent includes a cationic salt and may further include an anionic salt. As the first antistatic agent is an antistatic agent that is solid at 25 ° C., the adhesive force of the base film 120 is excellent, and by maintaining an appropriate surface resistance, it is possible to exhibit an excellent workability upon adhesion.

The cationic salt of the first antistatic agent includes a nitrogen onium salt having a substituted or unsubstituted aryl group, and may be a cationic salt represented by the following Chemical Formula 1, preferably a cationic salt represented by the following Chemical Formula 2 It may be more advantageous in terms of workability.

[Formula 1]

In Formula 1, R ¹ , R ² , R ³ are each independently a C ₁ ~ C ₄ straight-chain or C ₃ ~ C ₅ pulverized alkyl group.

[Formula 2]

Further, the anionic salt of the first antistatic agent is a ^{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 comprise at least one selected from the group consisting of, preferably _{^{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, preferably, the first antistatic agent may be a compound represented by Formula 3 below. Accordingly, when attached, the workability can exhibit a remarkably excellent effect.

[Formula 3]

The first composition may include the first antistatic agent in an amount of 0.01 to 5 parts by weight, preferably 0.1 to 4.5 parts by weight based on 100 parts by weight of the first agent resin. If the first antistatic agent is less than 0.01 parts by weight based on 100 parts by weight of the first agent resin, an electrical short circuit may occur, and a problem of deterioration in workability may occur when attached, and if it exceeds 5 parts by weight, the base film ( 120) may cause a problem that the adhesive strength is lowered.

In addition, the thickness of the first adhesive layer 121 is not particularly limited as long as the thickness of the adhesive layer included in the adhesive sheet, preferably 10 ~ 30㎛, more preferably 11 ~ 27㎛ have.

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

Meanwhile, at least one surface of the first base material 122 included in the base film 120 according to the present invention may be prevented from being antistatic to prevent static electricity. By preventing the generation of static electricity through the anti-static treatment, by reducing the difference in refractive index between the first adhesive layer 121 and / or the protective film 130, the workability can be improved when attached.

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 decreases when attached, and the defect rate may increase.

In addition, the adhesive force of the base film 120 should be high enough not to peel off the adhesive sheet formed on the lower portion of the display, preferably, the base film has an adhesive force measured by the following measuring method of 1,300 gf / in or more, more preferably The adhesive force may be 1400 gf / in or more.

[How to measure]

The adhesive strength when peeling 180 ° at a rate of 5 mm per second after 24 hours by attaching the base film to glass was measured.

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

Next, the protective film 130 will be described.

The protective film 130 is responsible for protecting the lower portion of the base film 120 that is directly attached to the display. It is possible to apply and attach the adhesive sheet for a display according to the present invention to a display. In this case, the release film 110, which will be described later, is first peeled off, and a laminate comprising a base film 120 and a protective film 130 on the display After the 200 is attached, the protective film 130 may be peeled off the laminate 200.

The second adhesive layer 131 provided on the protective film 130 is formed through a second composition including a second subject resin and a second antistatic agent.

The second agent resin may be used without limitation as long as it is a material for forming an adhesive layer in the art, and may preferably be an acrylic copolymer.

In addition, the second topical resin may have an acid value of 35 to 75 mgKOH / g, preferably an acid value of 40 to 70 mgKOH / g. If the acid value of the second agent resin is outside the above range, there may be a problem that workability is deteriorated when attached.

On the other hand, the acid value may be an acid value measured through a method for conventionally measuring the acid value in the art, preferably in accordance with KSM0065, polymer sample (solid content 100%) 0.5g toluene, 2-propanol and distilled water 50 : 49.5: Dissolved in 50 g of a mixed solvent containing a weight ratio of 0.5 to prepare a sample, and can be measured through a 0.1N 2-propanol potassium hydroxide solution.

The second antistatic agent is an antistatic agent that is solid at 25 ° C., and the second antistatic agent includes a cationic salt and may further include an anionic salt. Since the second antistatic agent may be the same antistatic agent as the first antistatic agent described above, a detailed description of the second antistatic agent will be omitted.

The second composition may include the second antistatic agent in an amount of 0.01 to 2 parts by weight, and preferably 0.1 to 1.5 parts by weight based on 100 parts by weight of the second agent resin. If the second antistatic agent is less than 0.01 parts by weight, or more than 2 parts by weight, with respect to 100 parts by weight of the second agent resin, there may be a problem that workability deteriorates when attached.

In addition, the thickness of the second adhesive layer 131 is not particularly limited as long as the thickness of the adhesive layer included in the adhesive sheet, preferably 1 to 10 μm, and more preferably 2 to 9 μm. have.

The second base material 132 may be used without limitation as long as it is a material that can be commonly used in a protective film in the art, and preferably may be a PET base material. In addition, the thickness of the second base material 132 is not limited as long as it is a thickness of a substrate that can be used for an adhesive sheet, and may preferably be 25 to 100 μm, more preferably 35 to 90 μm.

Meanwhile, at least one surface of the second base material 132 included in the protective film 130 according to the present invention may be prevented from being charged to prevent static electricity. By preventing the generation of static electricity through the anti-static treatment, the workability can be improved when attached by reducing the difference in refractive index between the second adhesive layer 131 and / or the base film 120.

In addition, during the step of peeling the protective film 130 from the laminate 200 including the base film 120 and the protective film 130, the base film 120 so that peeling between the display and the base film 120 does not occur And the peeling force between the protective film 130 may be relatively small compared to the adhesive force of the first adhesive layer 121 of the base film 120, when removing the release film 110 to be described later in the adhesive sheet for display , In order to prevent peeling between the base film 120 and the protective film 130, the peeling force between the base film 120 and the protective film 130 may be greater than the release force between the base film 120 and the release film 110. have. Specifically, the peel force between the base film 120 and the protective film 130 may be 5 to 14 gf / in, and preferably 6 to 13 gf / in. If the peeling force between the base film 120 and the protective film 130 is less than 5 gf / in, when peeling the release film, a problem that the base film and the protective film peel together may occur, and the peeling force is 14 gf / in Exceeding may cause a problem that workability deteriorates when the protective film is peeled.

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 first adhesive layer 121, is adhered by the first adhesive layer 121, one side of the anti-static treatment release film (110); may further include.

The release film 110 is responsible for protecting the laminate 200 including the base film 120 and the protective film 130. It is possible to apply and attach the adhesive sheet for a display according to the present invention to a display. In this case, the release film 110 is first peeled, and then a laminate comprising a base film 120 and a protective film 130 on the display ( 200) can be attached.

At this time, in the step of peeling off the release film 110, the release force of the release film 110 is between the base film 120 and the protective film 130 so that the release between the base film 120 and the protective film 130 does not occur. It may be relatively small compared to the peel force, preferably 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 workability may deteriorate when attached, and if it exceeds 7 gf / in, the release film 110 is replaced with the base film 120 and the protective film 130 When peeling from the laminate 200 including a, peeling between the base film 120 and the protective film 130 may occur, and accordingly, the defect rate may be significantly increased.

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

On the other hand, the release film 110 according to the present invention may be at least one surface, preferably the top surface and the bottom surface of the antistatic treatment to prevent the generation of static electricity. By preventing the generation of static electricity through the antistatic treatment, and by reducing the difference in refractive index between the base film 120 and the protective film 130, the recognition rate at the time of attachment can be further improved.

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

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

The adhesive sheet for a display according to the present invention comprises the steps of forming a first temporary adhesive layer by applying a first composition comprising a first subject resin and a first antistatic agent to the upper surface of the first base material 122; The release film 110 is laminated on the upper surface of the first base material 122 on which the first temporary adhesive layer is formed, and the first temporary adhesive layer is cured to produce the laminated release film 110 and the base film 120. To do; Preparing a protective film 130 by applying and curing a second composition on the upper surface of the second substrate to form a second adhesive layer 131; And laminating the base film 110 on the upper surface of the protective film 130.

First, a step of forming a first temporary adhesive layer by applying a first composition including a first subject resin and a first antistatic agent to the upper surface of the first base material 122 will be described.

The first composition may include a first agent resin and a first antistatic agent, and may further include a first curing agent and a solvent.

The first topical 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 first curing agent can be used without limitation as long as it is a curing agent that can be used to form an adhesive layer that usually exhibits sufficient adhesion, preferably an epoxy-based curing agent, and more preferably an epoxy amine-based curing agent. And even more preferably N, N, N, N'-tetraglycidyl-m-xylenediamine. The first curing agent may be included in 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 first agent resin. If the content of the first curing agent is less than 0.02 parts by weight based on 100 parts by weight of the first agent resin, the first adhesive layer may not be cured to a desired level, and if it exceeds 0.35 parts by weight, the first adhesive layer is excessive It may cause a problem that the adhesive strength is lowered.

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

Next, the release film 110 is laminated on the upper surface of the first base material 122 on which the first temporary adhesive layer is formed, and the first temporary adhesive layer is cured to form a laminated release film 110 and a base film 120. The steps for manufacturing it will be described.

The method of laminating the release film 110 on the upper surface of the first base material 122 on which the first temporary adhesive layer is formed may be used without limitation if methods and / or conditions that can be commonly used in the art. However, lamination can be performed using a roll laminator at room temperature, 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 that can be conventionally used in the art, preferably at 30 to 80 ° C. for 30 to 60 hours, more preferably at 40 to 70 ° C. It may be cured for 40 to 55 hours, but is not limited thereto.

Next, the step of manufacturing the protective film 130 by applying and curing the second composition on the upper surface of the second substrate to form the second adhesive layer 131 will be described.

The second composition may include a second agent resin, a second antistatic agent, a second curing agent, and a solvent.

The second main resin may have a weight average molecular weight of 5,000 to 100,000, and preferably a weight average molecular weight of 20,000 to 80,000.

In addition, the second 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 exhibits a relatively low adhesive strength, compared to the first adhesive layer, and preferably an isocyanate-based curing agent. The second curing agent may be included in 2 to 8 parts by weight, preferably 3 to 7 parts by weight with respect to 100 parts by weight of the second agent resin. If the content of the second curing agent is less than 2 parts by weight based on 100 parts by weight of the second agent resin, the second adhesive layer may not be cured to a desired level, and if it exceeds 8 parts by weight, the second adhesive layer is excessive It may cause a problem that the adhesive strength is lowered.

In addition, the solvent can be used without limitation, as long as it is a solvent that can be used in an adhesive composition that usually forms an adhesive layer, preferably an aqueous solvent, an alcohol solvent, a ketone solvent, an amine solvent, an ester solvent, and an acetate solvent. It may include one or more selected from the group consisting of a solvent, an amide-based solvent, a halogenated hydrocarbon-based solvent, an ether-based solvent, and a furan-based solvent, and more preferably an alcohol-based solvent, a ketone-based solvent, an amine-based solvent, and an ester-based 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 include 60 to 80 parts by weight, preferably 65 to 75 parts by weight, based on 100 parts by weight of the second agent resin, but is not limited thereto.

Meanwhile, the second composition may further include a leveling agent and a wetting agent. The leveling agent and the wetting agent can be used without limitation as long as it is a material that can be generally employed in forming an adhesive layer in the art. Preferably, the leveling agent may be polyacrylate, and the wetting agent may be polyethersiloxane, but is not limited thereto. In addition, the leveling agent may be included in 0.25 to 2.25 parts by weight, preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the second agent resin, and the wetting agent is 0.25 to 5 parts by weight relative to 100 parts by weight of the second agent resin , Preferably 0.5 to 4 parts by weight, but is not limited thereto.

Next, a step of laminating the base film 110 on the upper surface of the protective film 130 will be described.

The laminating paper can be used without limitation as long as it is a laminating method that can be commonly used in the art. Preferably, the laminating paper can be prepared by laminating using a roll laminator at room temperature, but is not limited thereto.

The present invention is a method for applying the adhesive sheet for a display according to the present invention to a display, peeling the release film from the above-mentioned adhesive sheet for a display; Bonding the release film and the base film and the protective film to the display; And peeling the protective film from the adhesive base film and the protective film; provides an application method of the adhesive sheet for a display comprising a.

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

3, the base film 120 "may be attached to the lower portion of the display 300. Specifically, a first adhesive layer 121" having a sufficient adhesive force and a first substrate 122 functioning to protect the display By including the base film 120 including "", it is possible to protect the lower portion of the display and prevent static electricity from being generated in the display device.

On the other hand, the adhesive sheet for a display according to the present invention and the display including the same can prevent static electricity generation through an antistatic treatment, and at the same time, the defect rate is significantly lowered, corrosion of the adherend does not occur, and adhesion to the display device is excellent. It works.

The present invention will be described in more detail through the following examples, but the following examples are not intended to limit the scope of the present invention, which should be interpreted to help understand the present invention.

<Example 1>

(1) Base film production and release film lamination

An acid value of 60 mgKOH / g, a weight average molecular weight of 600,000, and a copolymer copolymerized with acrylic acid, butyl acrylate, ethyl acrylate, and vinyl acetate randomly as the first agent resin, based on 100 parts by weight of the first agent resin As the first curing agent, N, N, N, N'-tetraglycidyl-m-xylenediamine 0.22 parts by weight, 4.25 parts by weight of a compound represented by the following Chemical Formula 3 solid at 25 ° C as a first antistatic agent and a solvent The first composition was prepared by mixing 39 parts by weight of methyl ethyl ketone.

Then, a thin layer of PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) was applied to the lower surface of the PET substrate having a thickness of 75 μm on the lower surface, and the upper surface of the first substrate treated with antistatic treatment, The first composition is applied to form a first adhesive layer, and a thin film of PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) is formed on the upper and lower surfaces of a PET substrate having a thickness of 75 µm. It is coated with antistatic treatment, and a thin film of silicone release agent is applied to the lower surface, placed so that the lower surface of the release film treated with silicone release is in contact with the first temporary adhesive layer, and then laminated at room temperature using a roll laminator at 50 ℃. After curing for 48 hours, a base film having a first adhesive layer having a thickness of 14 μm and a release film laminated on the upper surface of the base film were prepared.

[Formula 3]

(2) Production of protective film

As the second main resin, an acid value of 45 mgKOH / g, a weight average molecular weight of 50,000, and a copolymer of acrylic acid, methyl acrylate, ethyl acrylate, and vinyl acetate randomly copolymerized with respect to 100 parts by weight of the second main resin 5 parts by weight of polyisocyanate as a second curing agent, 0.25 parts by weight of a compound represented by the following formula (3) as a second antistatic agent, 1.25 parts by weight of a polyacrylate as a leveling agent, polyethersiloxane as a wetting agent and methyl ethyl ketone (MEK) 70 as a solvent A second composition was prepared by mixing parts by weight.

Thereafter, a thin film of PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) was applied to the lower surface of the PET substrate having a thickness of 36 µm, and the second composition was applied to the upper surface of the second substrate antistatically treated. Was applied and cured at 50 ° C. for 48 hours to prepare a protective film on which a second adhesive layer having a thickness of 7 μm was formed.

[Formula 3]

(3) Manufacturing adhesive sheet for display

The base film laminated with the release film and the protective film were laminated at 25 ° C using a roll laminator to prepare an adhesive sheet for display.

<Examples 2 to 15>

Prepared in the same manner as in Example 1, but by changing the first antistatic agent content, the second antistatic agent content, the first agent resin acid value, the second agent resin acid value, etc., as shown in Tables 1 to 4 below. An adhesive sheet for display such as 4 was prepared.

<Comparative Examples 1 to 2>

Prepared in the same manner as in Example 1, but by changing the acid value of the first main resin as shown in Tables 1 to 4 below to prepare a pressure-sensitive adhesive sheet for display as shown in Tables 1 to 4.

<Comparative Example 3>

Prepared in the same manner as in Example 1, the first antistatic agent represented by the following Chemical Formula 4, N-hexyl-4-methylpyridinium hexafluorophosphate (N-hexyl-4-methylpyridinium) which is liquid at 25 ° C A hexafluorophosphate, CAS no. 929897-32-5) was prepared in the same manner as in Example 1, except that an adhesive sheet for display was prepared.

[Formula 4]

<Comparative Example 4>

Prepared in the same manner as in Example 1, the first antistatic agent and the second antistatic agent represented by the formula (4), N-hexyl-4-methylpyridinium hexafluorophosphate (N- liquid) at 25 ℃ A hexyl-4-methylpyridinium hexafluorophosphate, CAS no. 929897-32-5) was prepared in the same manner as in Example 1, except that an adhesive sheet for display was prepared.

<Comparative Examples 5 to 8>

Prepared in the same manner as in Comparative Example 3, and represented by Chemical Formula 4, by changing the content of the first antistatic agent, which is liquid at 25 ° C., to prepare a display adhesive sheet as shown in Tables 1 to 4.

<Experimental Example>

1. Release film Release force , Base film adhesion, protective film Peeling force  And Peeling voltage  evaluation

With respect to the adhesive sheet for a display prepared according to Examples and Comparative Examples, the adhesive sheet for a display was cut to 1 inch width, and then peeled at 180 ° at a rate of 40 mm per second to measure the release force of the release film. After removing the release film by cutting to 1 inch width, the surface was attached to the cleaned glass and peeled at 180 ° at a rate of 5 mm per second after 24 hours to measure the adhesive strength of the first adhesive layer, including the base film and protective film. The laminate to be cut was cut to 1 inch wide and the protective film was peeled at 180 ° at a rate of 40 mm per second to measure the peeling force between the base film and the protective film, and after cutting the adhesive sheet for display to 100 × 100 mm, 80 mm per second The release film was peeled at 180 ° at a rate of 1 to measure the peeling voltage (V) of the first adhesive layer. This is repeated 5 times, and when the average value is 0.05 kV or less-○, when exceeding 0.05 kV-x is shown in Tables 1 to 4 below.

2. Evaluation of adhesion workability

The adhesion of the adhesive sheet for a display prepared according to the above Examples and Comparative Examples to the display was evaluated by evaluating the error of the process three times as follows, and the workability of the attachment process was evaluated and shown in Tables 1 to 4 below.

2- (1) Primary workability error evaluation

During the process of attaching the adhesive sheet for a display prepared according to Examples and Comparative Examples to a display, in the step of peeling the release film from the adhesive sheet for a display, if it is peeled off by performing it once-○, peeling off by performing it twice or more If possible, the error was evaluated during the first operation with-×. By repeating this 100 times, the ratio of errors (×) out of 100 times is shown in Tables 1 to 4 below.

2- (2) Secondary workability error evaluation

In the process of attaching the adhesive sheet for a display prepared according to Examples and Comparative Examples to a display, in a step of attaching a laminate comprising a base film and a protective film from which a release film has been peeled, an area outside the display device which is an adhered surface 0.1% or less of the total area of this laminate-○, 0.1% of the total area In case of exceeding, the error at the second operation was evaluated as-×. By repeating this 100 times, the ratio of errors (×) out of 100 times is shown in Tables 1 to 4 below.

2- (3) 3rd workability error evaluation

In the process of attaching the adhesive sheet for a display prepared according to Examples and Comparative Examples to a display, during the step of peeling off the protective film from the laminate including the attached base film and the protective film, if it is peeled by performing it once- ○, when peeling by performing more than 2 times, the error at the 3rd work was evaluated as-×. By repeating this 100 times, the ratio of errors (×) out of 100 times is shown in Tables 1 to 4 below.

3. Evaluation of adhesive performance for adhesive sheet for display

The base film of the adhesive sheet for a display prepared according to Examples and Comparative Examples was attached to the lower part of the display with a roll laminator at room temperature, and after 24 hours elapsed, it was left for 500 hours under conditions of 60 ° C and 90% humidity. As a method of confirming whether a peeling phenomenon occurs on the lower adhesive sheet, the base film adhesive performance was evaluated by setting the peeling phenomenon to-○ and the peeling phenomenon to-. It is shown in Table 1 to Table 4 below.

4. Adherend  Corrosion prevention evaluation

Peel off the release film of the adhesive sheet for display prepared according to Examples and Comparative Examples at the bottom, attach it with a roll laminator to SUS304 adherend at room temperature, and after 24 hours elapse, under conditions of temperature 60 ° C and humidity 90% After standing for 500 hours, the mixture was taken out at room temperature, and the surface condition of the adherend was observed to evaluate corrosion. At this time, when corrosion of the adherend does not occur-○, when corrosion of the adherend occurs-x was evaluated to prevent corrosion of the adherend. It is shown in Table 1 to Table 4 below.

division Example
One Example
2 Example
3 Example
4 Example
5 Example
6 The first
Composition First topic balance Mountain
(mgKOH / g) 60 60 60 60 60 60 First anti-war agent Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 4.25 0.005 0.5 2 7 4.25 2nd
Composition Resin 2 Mountain
(mgKOH / g) 45 45 45 45 45 45 Anti-World War II Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 0.25 0.25 0.25 0.25 0.25 0.005 Release film release force (gf / in) 3.5 8.2 5.9 3.4 0.8 3.5 Base film adhesion (gf / in) 1489 1712 1665 1589 550 1489 Base film, protective film peel force (gf / in) 7.9 7.9 7.9 7.9 7.9 14.5 Peeling voltage of the first adhesive layer ○ × ○ ○ ○ ○ Evaluation of the workability of the attachment process
(Error rate) Primary(%) 0 57 0 0 9 0 Secondary(%) 0 7 0 0 28 0 3rd (%) 0 6 0 0 2 25  Evaluation of adhesive performance for adhesive sheets for displays ○ ○ ○ ○ × ○ Evaluation of corrosion prevention of adherend ○ ○ ○ ○ ○ ○

division Example
7 Example
8 Example
9 Example
10 Example
11 Example
12 The first
Composition First topic balance Mountain
(mgKOH / g) 60 60 60 45 75 60 First anti-war agent Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 4.25 4.25 4.25 4.25 4.25 4.25 2nd
Composition Resin 2 Mountain
(mgKOH / g) 45 45 45 45 45 30 Anti-World War II Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 0.15 1.5 2.5 0.25 0.25 0.25 Release film release force (gf / in) 3.5 3.5 3.5 1.9 5.7 3.5 Base film adhesion (gf / in) 1489 1489 1489 1376 1791 1489 Base film, protective film peel force (gf / in) 7.8 6.0 2.8 7.9 7.9 3.7 Peeling voltage of the first adhesive layer ○ ○ ○ ○ ○ ○ Evaluation of the workability of the attachment process
(Error rate) Primary(%) 0 0 63 0 0 54 Secondary(%) 0 0 One 0 0 0 3rd (%) 0 0 15 0 0 11  Evaluation of adhesive performance for adhesive sheets for displays ○ ○ ○ ○ ○ ○ Evaluation of corrosion prevention of adherend ○ ○ ○ ○ ○ ○

division Example
13 Example
14 Example
15 Comparative example
One Comparative example
2 Comparative example
3 The first
Composition First topic balance Mountain
(mgKOH / g) 60 60 60 30 90 60 First anti-war agent Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Chemical formula
4 content
(Parts by weight) 4.25 4.25 4.25 4.25 4.25 4.25 2nd
Composition Resin 2 Mountain
(mgKOH / g) 40 70 80 45 45 45 Anti-World War II Kinds Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 0.25 0.25 0.25 0.25 0.25 0.25 Release film release force (gf / in) 3.5 3.5 3.5 2.0 10.4 1.3 Base film adhesion (gf / in) 1489 1489 1489 1090 2590 613 Base film, protective film peel force (gf / in) 5.8 10.6 20.5 7.9 7.9 7.9 Peeling voltage of the first adhesive layer ○ ○ ○ ○ ○ ○ Evaluation of the workability of the attachment process
(Error rate) Primary(%) 0 0 0 3 57 8 Secondary(%) 0 0 0 17 7 31 3rd (%) 0 0 37 0 0 One  Evaluation of adhesive performance for adhesive sheets for displays ○ ○ ○ × ○ × Evaluation of corrosion prevention of adherend ○ ○ ○ ○ × ○

division Comparative example
4 Comparative example
5 Comparative example
6 Comparative example
7 Comparative example
8 The first
Composition First topic balance Mountain
(mgKOH / g) 60 60 60 60 60 First anti-war agent Kinds Chemical formula
4 Chemical formula
4 Chemical formula
4 Chemical formula
4 Chemical formula
4 content
(Parts by weight) 4.25 0.005 0.5 2 7 2nd
Composition Resin 2 Mountain
(mgKOH / g) 45 45 45 45 45 Anti-World War II Kinds Chemical formula
4 Formula 3 Formula 3 Formula 3 Formula 3 content
(Parts by weight) 0.25 0.25 0.25 0.25 0.25 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 Base film, protective film peel force (gf / in) 4.4 7.9 7.9 7.9 7.9 Peeling voltage of the first adhesive layer × × × × × Evaluation of the workability of the attachment process
(Error rate) Primary(%) 6 64 47 62 94 Secondary(%) 30 2 3 9 39 3rd (%) 14 0 0 0 3  Evaluation of adhesive performance for adhesive sheets for displays × ○ ○ × × Evaluation of corrosion prevention of adherend × ○ ○ × ×

As can be seen from Tables 1 to 4 above,

Example 1, Example satisfying all of the preferred first antistatic agent content, the second antistatic agent content, the first agent resin acid value, the second agent resin, the first antistatic agent, and the second antistatic agent according to the present invention 3, Example 4, Example 7, Example 8, Example 10, Example 11, Example 13, and Example 14, Example 2, Example 5, Example 6, Example 1, which is missing any of them Compared to Example 9, Example 12, Example 15 and Comparative Examples 1 to 8, the adhesive strength is excellent, the workability upon attachment is excellent, the adhesive performance evaluation result of the adhesive sheet for display is excellent, and corrosion of the adherend is prevented It can be confirmed.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention may add elements within the scope of the same spirit. However, other embodiments may be easily proposed by changing, deleting, adding, or the like, but it will also be considered to be within the scope of the present invention.

110,111: release film 120,120 ', 120 ": base film
121,121 ', 121 ": 1st adhesive layer 122,122', 122": 1st base material
130,130 ': Protective film 131,131': Second adhesive layer
132,132 ': Second base 200: Laminate
300: display

Claims (19)

The first base material and the first antistatic agent, which is formed on the upper surface of the first base material and has an acid value of 45 to 75 mgKOH / g, is solid at 25 ° C and contains 0.1 to 4.5 parts by weight of the first antistatic agent. A base film comprising a first adhesive layer formed through the first composition; And
Through the second composition containing 0.01 to 2 parts by weight of a second antistatic agent solid at 25 ° C relative to 100 parts by weight of the second agent resin having an acid value of 40 to 70 mgKOH / g, adhered to the lower surface of the first substrate It includes; a formed second adhesive layer and a protective film comprising a second base formed on the lower surface of the second adhesive layer;
The first antistatic agent is a pressure-sensitive adhesive sheet for a display comprising a cationic salt comprising a nitrogen onium salt having a substituted or unsubstituted aryl group. According to claim 1,
The first antistatic agent is an adhesive sheet for a display comprising a cationic salt represented by Formula 1 below:
[Formula 1]

In Formula 1, R ¹ , R ² , R ³ are each independently a C ₁ ~ C ₄ straight-chain or C ₃ ~ C ₅ pulverized alkyl group. According to claim 1,
The first antistatic agent is a pressure-sensitive adhesive sheet for a display comprising a cationic salt represented by the following formula (2):
[Formula 2]

According to claim 1,
The first antistatic agent is a ^{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 ^-The adhesive sheet for a display further comprising an anionic salt comprising at least one selected from the group consisting of. According to claim 1,
The first antistatic agent is a pressure-sensitive adhesive sheet for a display, which is a compound represented by the following Chemical Formula 3:
[Formula 3]

delete According to claim 1,
The first resin is an adhesive sheet for display, which is an acrylic copolymer. delete delete According to claim 1,
The second subject resin is an acrylic copolymer adhesive sheet for display. According to claim 1,
The first substrate and the second substrate are PET-based adhesive sheets for display. According to claim 1,
The first base material and the second base material are at least one surface of the anti-static adhesive display sheet. According to claim 1,
It is provided on the upper surface of the first adhesive layer is adhered by the first adhesive layer, one side of the anti-static treatment release film; further comprising an adhesive sheet for display. The method of claim 13,
The release film is a pressure-sensitive adhesive sheet for a silicone release treatment of the lower surface. The method of claim 13,
A display adhesive sheet having a release force between the base film and a release film of 1 to 7 gf / in. According to claim 1,
The base film has a transmittance of 88% or more, and a haze (Haze) of 0.5 to 2%. According to claim 1,
The base film is an adhesive sheet for a display having an adhesive strength of 1,300 gf / in or more measured by the following measuring method:
[How to measure]
The adhesive strength when peeling 180 ° at a rate of 5 mm per second after 24 hours by attaching the base film to glass was measured. Peeling the release film from the adhesive sheet for a display of any one of claims 1 to 5, 7, 10 to 17;
Bonding the release film and the base film and the protective film to the display; And
Peeling the protective film from the adhesive base film and the protective film; Application method of the adhesive sheet for a display comprising a. A display comprising the base film of any one of claims 1 to 5, 7 or 10 to 17.

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