JP6793230B2 - Adhesive sheet for display and display including this - Google Patents

Description

The present invention relates to an adhesive sheet for a display. More specifically, the generation of static electricity can be prevented through antistatic treatment, the defective rate is remarkably reduced, the adherend does not corrode, and the adhesive strength with the display device is excellent. Adhesive sheets for displays and displays including them.

Recently, flat panel display elements (Flat Panel Display) have been in the limelight as display elements due to the dramatic development of information and communication technology and the expansion of the market. Typical examples of such a flat plate display element include a liquid crystal display element (Liquid Crystal Display), a plasma display element (Plasma Display Panel), and an organic light emitting element (Organic Light Emitting Devices).

Organic light emitting elements have advantages such as quick response speed, lightness, thinness, shortness, low power consumption, self-luminous element, and flexibility, so the demand for them is increasing not only for next-generation display elements and displays but also for lighting. doing.

The organic light emitting element 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 in this order, and is supplied from the electrodes on both sides. The principle is that the electrons and holes are recombined in the organic light emitting layer and emit light using the emitted energy.

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

On the other hand, the lower part of the display device includes an adhesive sheet for protecting the display device from external force and preventing the generation of static electricity, but the conventional adhesive sheet for display cannot prevent the generation of static electricity and displays. There was a problem that the adhesive strength with the device was not good.

Therefore, research on adhesive sheets for displays, which can prevent the generation of static electricity through antistatic treatment, significantly reduce the defective rate, do not cause corrosion of the adherend, and have excellent adhesive strength with the display device, is urgently needed. The reality is what is needed.

Korean Patent Publication KR10-0225953B1 (Registration date: 2000.1021)

The present invention has been devised to solve the above-mentioned problems, and it is possible to prevent the generation of static electricity through antistatic treatment, the defective rate is remarkably reduced, and the adherend is not corroded. An object of the present invention is to provide an adhesive sheet for a display having excellent adhesive strength with a display device and a display including the adhesive sheet.

In order to solve the above-mentioned problems, the present invention is formed on the first base material and the upper surface of the first base material, and is a solid phase at 25 ° C. with a first base resin having an acid value of 40 to 80 mgKOH / g. A base film containing a first adhesive layer formed through a first composition containing a first antistatic agent; and formed on a second adhesive layer adhered to the lower surface of the first base material and the lower surface of the second adhesive layer. The first antistatic agent comprises a protective film containing a second substrate; the first antistatic agent provides a display pressure-sensitive adhesive sheet containing a cationic salt containing a nitrogen onium salt having a substituted or unsubstituted aryl group.

According to one embodiment of the present invention, the first antistatic agent can contain a cationic salt represented by the following chemical formula 1.

In the above chemical formula 1, R ¹ , R ² , and R ³ are independently linear alkyl groups of C _{1 to} C ₄ or branched chain alkyl groups of C _{3 to} C ₅ , respectively.

In addition, the first antistatic agent can contain a cationic salt represented by the following chemical formula 2.

The first 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 ^- anionic salts containing one or more selected from the group consisting of may further include a.

Further, the first antistatic agent may be a compound represented by the following chemical formula 3.

Further, the first composition may contain the first antistatic agent in an amount of 0.01 to 5 parts by weight with respect to 100 parts by weight of the first main agent resin.

Further, the first main agent resin may be an acrylic copolymer.

Further, the second adhesive layer can be formed through a second composition containing a second main agent resin having an acid value of 35 to 75 mgKOH / g and a second antistatic agent which is a solid phase at 25 ° C.

Further, the second composition may contain 0.01 to 2 parts by weight of the second antistatic agent with respect to 100 parts by weight of the second main agent resin.

Further, the second main agent resin may be an acrylic copolymer.

Further, the first base material and the second base material may be PET base materials.

Further, at least one surface of the first base material and the second base material can be antistatic treated.

Further, a release film provided on the upper surface of the first adhesive layer, which is adhered by the first adhesive layer and whose one surface is antistatic treated; can be further included.

Further, the lower surface of the release film may be subjected to silicon release treatment.

Further, the release force between the base film and the release film can be 1 to 7 gf / in.

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

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

[Measuring method]
After 24 hours had passed since the base film was attached to the glass, the adhesive strength when the base film was peeled off at a rate of 5 mm per second by 180 ° was measured.

On the other hand, the present invention is the step of peeling the release film from the above-mentioned adhesive sheet for display; the step of adhering the base film and the protective film from which the release film is peeled to the display; and the step of adhering the protective film from the adhered base film and the protective film. A method of applying an adhesive sheet for a display including a peeling step;

On the other hand, the present invention provides a display including the above-mentioned base film.

The adhesive sheet for a display and the display including the adhesive sheet for a display according to the present invention can prevent the generation of static electricity through antistatic treatment, the defective rate is remarkably reduced, the adherend does not corrode, and the adhesive adheres to the display device. Power has an excellent effect.

FIG. 3 is a cross-sectional view of an adhesive sheet for a display according to an embodiment of the present invention. Separation sectional view of adhesive sheet for display which concerns on one Example of this invention. FIG. 5 is a sectional view of a display according to an embodiment of the present invention.

Hereinafter, examples of the present invention will be described in detail with reference to the accompanying drawings so that a person having ordinary knowledge in the technical field to which the present invention belongs can easily carry out the embodiments. The present invention can be embodied in a variety of different forms and is not limited to the examples described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

As shown in FIG. 1, the pressure-sensitive adhesive sheet for a display according to an embodiment of the present invention includes a first base material 122 and a base film 120 including a first pressure-sensitive adhesive layer 121 formed on the upper surface of the first base material 122. A protective film 130 including a second adhesive layer 131 adhered to the lower surface of the first base material 122 and a second base material 132 formed on the lower surface of the second adhesive layer 131;

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

First, the base film 120 will be described.

The base film 120 is responsible for the function of being directly attached to the display to protect the lower part of the display and support the device.

The first adhesive layer 121 is formed through a first composition containing a first base resin and a first antistatic agent.

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

The first base 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 base resin is less than 40 mgKOH / g, the first adhesive layer cannot exhibit the desired level of adhesive strength, and as a result, the reliability may decrease, and the acid. If the value exceeds 80 mgKOH / g, corrosion of the adherend may occur.

On the other hand, the acid value may be an acid value measured through a method that normally measures the acid value in the art, and 0.5 g of a polymer sample (solid content 100%) is preferably added in toluene and 2 according to KSM0065. Samples can be prepared by dissolving -propanol and distilled water in 50 g of a mixed solvent containing a weight ratio of 50: 49.5: 0.5 and measured through a 0.1 N 2-propanol potassium hydroxide solution.

The first antistatic agent is an antistatic agent having a solid phase at 25 ° C., and the first antistatic agent contains a cationic salt and can further contain an anionic salt. Since the first antistatic agent is an antistatic agent having a solid phase at 25 ° C., the adhesive strength of the base film 120 is excellent, and by maintaining an appropriate surface resistance, the workability at the time of adhesion is excellent. Can be expressed.

The cationic salt of the first antistatic agent contains 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 the following chemical formula 2. The indicated cationic salt may be even more advantageous in terms of workability during attachment.

In the above chemical formula 1, R ¹ , R ² , and R ³ are independently linear alkyl groups of C _{1 to} C ₄ or branched chain alkyl groups of C _{3 to} C ₅ , respectively.

Further, anionic salts of said first 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 ^- can include one or more selected from the group consisting of, preferably _{^{PF 6 -, BF 4 -,}} I - and It may include one or more selected from the group consisting of ^{_{- (CF 3 SO 2) 2}} N.

Further, preferably, the first antistatic agent may be a compound represented by the following chemical formula 3. Along with this, the workability at the time of adhesion can be remarkably excellent.

The first composition may contain 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 main agent resin. If the amount of the first antistatic agent is less than 0.01 parts by weight with respect to 100 parts by weight of the first main agent resin, an electrical short circuit may occur, which may cause a problem that workability at the time of adhesion is lowered. If it exceeds 5 parts by weight, a problem that the adhesive strength of the base film 120 is lowered may occur.

Further, the thickness of the first adhesive layer 121 is not limited as long as it is the thickness of the adhesive layer normally contained in the adhesive sheet, and may be preferably 10 to 30 μm, more preferably 11 to 27 μm. obtain.

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

On the other hand, at least one surface, preferably the lower surface, of the first base material 122 contained in the base film 120 according to the present invention can be antistatically treated in order to prevent the generation of static electricity. By preventing the generation of static electricity through the antistatic treatment and reducing the difference in refractive index between the first adhesive layer 121 and / or the protective film 130, workability at the time of adhesion can be improved.

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. Further, 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 at the time of adhesion may decrease and the defect rate may increase.

Further, the adhesive strength of the base film 120 must be sufficiently high so that the adhesive sheet formed on the lower portion of the display is not peeled off, and preferably the base film has an adhesive strength measured by the following measuring method. The adhesive strength may be 300 gf / in or more, more preferably 1400 gf / in or more.

[Measuring method]
After 24 hours had passed since the base film was attached to the glass, the adhesive strength when the base film was peeled off at a rate of 5 mm per second by 180 ° was measured.

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

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. The display adhesive sheet according to the present invention can be applied to the display and adhered to the display. In this case, the release film 110 described later is peeled off first, and the laminate 200 containing the base film 120 and the protective film 130 on the display. The protective film 130 can be peeled off from the laminated body 200 after adhering.

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

The second main agent resin can be used without limitation as long as it is a substance that normally forms an adhesive layer in the art, and may be an acrylic copolymer.

The second main agent 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 main agent resin deviates from the above range, there may be a problem that workability at the time of adhesion is lowered.

On the other hand, the acid value may be an acid value measured through a method that normally measures the acid value in the art, and 0.5 g of a polymer sample (solid content 100%) is preferably added in toluene and 2 according to KSM0065. Samples can be prepared by dissolving -propanol and distilled water in 50 g of a mixed solvent containing a weight ratio of 50: 49.5: 0.5 and measured through a 0.1 N 2-propanol potassium hydroxide solution.

The second antistatic agent is an antistatic agent having a solid phase at 25 ° C., and the second antistatic agent contains a cationic salt and can further contain an anionic salt. Since the second antistatic agent can be the same antistatic agent as the first antistatic agent described above, detailed description of the second antistatic agent will be omitted.

The second composition may contain the second antistatic agent in an amount of 0.01 to 2 parts by weight, preferably 0.1 to 1.5 parts by weight, based on 100 parts by weight of the second main agent resin. If the amount of the second antistatic agent is less than 0.01 parts by weight or exceeds 2 parts by weight with respect to 100 parts by weight of the second main agent resin, there may be a problem that workability at the time of adhesion is lowered.

The thickness of the second adhesive layer 131 is not limited as long as it is the thickness of the adhesive layer normally contained in the adhesive sheet, and may be preferably 1 to 10 μm, more preferably 2 to 9 μm. ..

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

On the other hand, in order to prevent the generation of static electricity, at least one surface, preferably the lower surface, of the second base material 132 contained in the protective film 130 according to the present invention can be antistatic treated. By preventing the generation of static electricity through the antistatic treatment and reducing the difference in refractive index from the second adhesive layer 131 and / or the base film 120, workability at the time of adhesion can be improved.

Further, the peeling force between the base film 120 and the protective film 130 is set so that the peeling between the display and the base film 120 does not occur during the step of peeling the protective film 130 from the laminate 200 including the base film 120 and the protective film 130. It may be relatively sufficiently small compared to the adhesive strength of the first adhesive layer 121 of the base film 120, and when the release film 110 described later is removed from the adhesive sheet for display, it is 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 larger than the release force between the base film 120 and the release film 110 so that peeling does not occur. Specifically, the peeling force between the base film 120 and the protective film 130 can be 5 to 14 gf / in, 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, there may be a problem that both the base film and the protective film are peeled off when the release film is peeled off, and the peeling force is 14 gf. If it exceeds / in, there may be a problem that workability is lowered when the protective film is peeled off.

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 and is adhered by the first adhesive layer 121, and one surface of the release film 110 is antistatic treated. Can be further included.

The release film 110 is in charge of the function of protecting the laminate 200 including the base film 120 and the protective film 130. The display adhesive sheet according to the present invention can be applied to the display and adhered to the display. In this case, the release film 110 is peeled off first, and then the laminate 200 containing the base film 120 and the protective film 130 on the display. Can be attached.

At this time, the release force of the release film 110 is compared with the release force between the base film 120 and the protective film 130 so that the release film 120 and the protective film 130 do not peel off at the stage of peeling the release film 110. 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 at the time of adhesion may decrease, and if it exceeds 7 gf / in, the release film 110 is used as a laminate containing the base film 120 and the protective film 130. When peeling from 200, peeling between the base film 120 and the protective film 130 may occur, and the defective rate may increase remarkably accordingly.

As shown in FIG. 2, the lower surface of the release film 110 can be released (A) in order for the release film 110 to exhibit the release force as described above. The mold release treatment can be used without limitation as long as it is a substance that can be normally used for the mold release treatment in the industry, and preferably the mold release treatment with silicon can exhibit an appropriate level of mold release force.

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

The release film 110 can be used without limitation as long as it is a material normally used for a release film in the art, and may be a PET base material. The thickness of the release film 110 is not limited as long as it is the thickness of the release film that can be normally used for an adhesive sheet, and may be preferably 30 to 90 μm, more preferably 35 to 85 μm. Not limited to this.

The above-mentioned adhesive sheet for display can be manufactured through the manufacturing method described later, but the present invention is not limited to this, and the same parts as those for the above-mentioned adhesive sheet for display will be omitted.

The adhesive sheet for display according to the present invention is a step of applying a first composition containing a first main agent resin and a first antistatic agent to an upper surface of a first base material 122 to form a first temporary adhesive layer; 1 Step of interleaving the release film 110 on the upper surface of the first base material 122 on which the temporary adhesive layer is formed and curing the first temporary adhesive layer to produce the interleaved release film 110 and the base film 120. A step of applying and curing the second composition on the upper surface of the second base material to form the second adhesive layer 131 to produce the protective film 130; and the base film 120 on the upper surface of the protective film 130. It can be manufactured including the step of interleaving to be placed;

First, a step of applying the first composition containing the first main agent resin and the first antistatic agent to the upper surface of the first base material 122 to form the first temporary adhesive layer will be described.

The first composition contains a first base resin and a first antistatic agent, and may further contain a first curing agent and a solvent.

The first base material resin can have a weight average molecular weight of 200,000 to 1,000,000, preferably a weight average molecular weight of 400,000 to 800,000.

Further, the first curing agent can be used without limitation as long as it is a curing agent that can be usually used for forming an adhesive layer exhibiting sufficient adhesive strength, preferably an epoxy-based curing agent can be used, and more preferably. Epoxy amine-based curing agents can be used, more preferably N, N, N, N'-tetraglycidyl-m-xylene diamine. The first curing agent may be contained 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 first main agent resin. If the content of the first curing agent is less than 0.02 parts by weight with respect to 100 parts by weight of the first main agent resin, the first adhesive layer may not be cured to the desired level, which is 0.35. If it exceeds the weight portion, the problem that the first adhesive layer is excessively hardened and the adhesive strength is lowered may occur.

Further, the solvent can be used without limitation as long as it is a solvent that can be usually used for the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer, and is preferably an aqueous solvent, an alcohol-based solvent, a ketone solvent, an amine-based solvent, or an ester-based solvent. It can contain one or more selected from the group consisting of a solvent, an acetate solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent, and more preferably an alcohol solvent and a ketone solvent. , Amine-based solvent, ester-based solvent, acetate-based solvent, and ether-based solvent can contain one or more selected from the group, and most preferably methyl ethyl ketone. The solvent may be contained in an amount of 20 to 60 parts by weight, preferably 25 to 55 parts by weight, based on 100 parts by weight of the first base resin, but is not limited thereto.

Next, the release film 110 was inserted onto the upper surface of the first base material 122 on which the first temporary adhesive layer was formed, and the first temporary adhesive layer was cured to form the released release film 110 and the base film 120. The manufacturing stage will be described.

The method of interleaving the release film 110 on the upper surface of the first base material 122 on which the first temporary adhesive layer is formed can be used without limitation as long as it is a method and / or conditions that can be normally used in the art. However, the paper can be interleaved using a roll laminator, preferably at room temperature, but the present invention is not limited to this.

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

Next, a step of applying and curing the second composition on the upper surface of the second base material to form the second adhesive layer 131 to produce the protective film 130 will be described.

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

The second base resin can have a weight average molecular weight of 5,000 to 100,000, preferably a weight average molecular weight of 20,000 to 80,000.

Further, the second curing agent can be used without limitation as long as it is a curing agent that can be usually used for forming an adhesive layer showing a relatively low adhesive strength as compared with the first adhesive layer, and is preferably isocyanate-based. Hardeners can be used. The second curing agent may be contained in an amount of 2 to 8 parts by weight, preferably 3 to 7 parts by weight, based on 100 parts by weight of the second main agent resin. If the content of the second curing agent is less than 2 parts by weight with respect to 100 parts by weight of the second main agent resin, the second adhesive layer may not be cured to the desired level, exceeding 8 parts by weight. Then, there may be a problem that the second adhesive layer is excessively cured and the adhesive strength is lowered.

Further, the solvent can be used without limitation as long as it is a solvent that can be usually used for the pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer, and is preferably an aqueous solvent, an alcohol-based solvent, a ketone solvent, an amine-based solvent, or an ester-based solvent. It can contain one or more selected from the group consisting of a solvent, an acetate solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent, and more preferably an alcohol solvent and a ketone solvent. , Amine-based solvent, ester-based solvent, acetate-based solvent, and ether-based solvent can contain one or more selected from the group, and most preferably methyl ethyl ketone. The solvent may be contained in an amount of 60 to 80 parts by weight, preferably 65 to 75 parts by weight, based on 100 parts by weight of the second base resin, but is not limited thereto.

On the other hand, the second composition can further contain a leveling agent and a wetting agent. The leveling agent and the wetting agent can be used without limitation as long as they are substances that can be usually adopted when forming an adhesive layer in the industry. Preferably, the leveling agent can be a polyacrylate and the wetting agent can be a polyether siloxane, but is not limited thereto. Further, the leveling agent may be contained in an amount of 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 main agent resin, and the wetting agent is 100 parts by weight of the second main agent resin. It may be contained in an amount of 0.25 to 5 parts by weight, preferably 0.5 to 4 parts by weight, but is not limited thereto.

Next, a step of interleaving the base film 120 so as to be arranged on the upper surface of the protective film 130 will be described.

The interleaving paper can be used without limitation as long as it is an interleaving paper method that can be normally used in the industry, and preferably, an adhesive sheet for a display can be manufactured by interleaving the interleaving paper using a roll laminator at room temperature. , Not limited to this.

The present invention is a method for applying the adhesive sheet for a display according to the present invention to a display, and is a step of peeling a release film from the above-mentioned adhesive sheet for a display; Provided is a method of applying an adhesive sheet for a display, which comprises a step of adhering to a display; and a step of peeling the protective film from the adhered base film and protective film.

On the other hand, the present invention includes a display device embodied including the above-mentioned base film.

As shown in FIG. 3, the base film 120 "can be attached to the lower part of the display 300. Specifically, the first adhesive layer 121 having sufficient adhesive strength and the first base material that functions to protect the display. By including the base film 120 "including 122", the lower part of the display can be protected and the generation of static electricity of the display device can be prevented.

On the other hand, the adhesive sheet for a display and the display including the adhesive sheet for a display according to the present invention can prevent the generation of static electricity through antistatic treatment, the defective rate is remarkably reduced, and the adherend material is not corroded. Has an excellent effect on the adhesive strength of.

Although the invention will be described in more detail through the examples below, the examples below do not limit the scope of the invention and should be construed as an aid to the understanding of the invention. ..

<Example 1>

(1) Production of base film and interleaving sheet for release film As the first main resin, the acid value is 60 mgKOH / g, the weight average molecular weight is 600,000, and acrylic acid, butyl acrylate, ethyl acrylate and vinyl acetate. 0.22 parts by weight of N, N, N, N'-tetraglycidyl-m-xylene diamine as the first curing agent with respect to 100 parts by weight of the first base resin, the copolymer randomly copolymerized with 1. As an antioxidant, 4.25 parts by weight of a compound represented by the following chemical formula 3 which is a solid phase at 25 ° C. and 39 parts by weight of methyl ethyl ketone as a solvent were mixed to prepare a first composition.

Then, PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) was thinly coated on the lower surface of the lower surface of the PET base material having a thickness of 75 μm, and the upper surface of the first base material was subjected to antistatic treatment. The first composition is applied to the above to form a first temporary adhesive layer, and PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene) is applied to the upper and lower surfaces of a PET substrate having a thickness of 75 μm. Polystyrene) was applied as a thin film to prevent antistatic treatment, and a silicon release agent was applied as a thin film on the lower surface to arrange the lower surface of the release film that had been subjected to silicon release treatment so that the first temporary adhesive layer was in contact with each other. After interleaving paper using a roll laminator at room temperature, it was cured at 50 ° C. for 48 hours to form a base film having a first adhesive layer having a thickness of 14 μm and a mold release laminated on the upper surface of the base film. The film was manufactured.

(2) Production of Protective Film As the second main resin, the acid value is 45 mgKOH / g, the weight average molecular weight is 50,000, and acrylic acid, methyl acrylate, ethyl acrylate and vinyl acetate are randomly copolymerized. The polymer is 100 parts by weight of the second main agent resin, 5 parts by weight of polyisocyanate as a second curing agent, 0.25 parts by weight of a compound represented by the following chemical formula 3 as a second antistatic agent, and as a leveling agent. A second composition was prepared by mixing 1.25 parts by weight of the polyacrylate, polyether siloxane as the wetting agent, and 70 parts by weight of methyl ethyl ketone (MEK) as the solvent.

After that, PEDOT / PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) was thinly coated on the lower surface of the PET base material having a thickness of 36 μm to prevent the charge from being applied to the upper surface of the second base material. The two compositions were applied and cured at 50 ° C. for 48 hours to produce a protective film having a second adhesive layer having a thickness of 7 μm.

(3) Manufacture of Adhesive Sheet for Display The adhesive sheet for display was manufactured by interlacing the base film and the protective film interleaving with the release film at 25 ° C. using a roll laminator.

<Examples 2 to 15>
Although it is produced in the same manner as in Example 1, as shown in Tables 1 to 4 below, the content of the first antistatic agent, the content of the second antistatic agent, the acid value of the first main agent resin and the second main agent. Adhesive sheets for displays as shown in Tables 1 to 4 were manufactured by changing the acid value of the resin and the like.

<Comparative Examples 1 and 2>
Although it was manufactured in the same manner as in Example 1, the adhesive sheet for display as shown in Tables 1 to 4 was manufactured by changing the acid value of the first base resin as shown in Tables 1 to 4 below. ..

<Comparative example 3>
N-hexyl-4-methylpyridinium hexafluorophosphate (N-hexyl-4), which is represented by the following chemical formula 4 as a first antistatic agent and is liquid at 25 ° C., although it is produced by carrying out the same procedure as in Example 1. A pressure-sensitive adhesive sheet for a display was produced in the same manner as in Example 1 except that −methylpyridinium hexafluorophosphate, CAS no. 929897-32-5) was used.

<Comparative example 4>
N-hexyl-4-methylpyridinium hexafluorophosphate, which is represented by the above chemical formula 4 as a first antistatic agent and a second antistatic agent and is liquid at 25 ° C., although it is produced by carrying out the same procedure as in Example 1. An adhesive sheet for a display was produced in the same manner as in Example 1 except that N-hexyl-4-methylpyridinium hexafluorophosphate (CAS no. 929897-32-5) was used.

<Comparative Examples 5 to 8>
Although it is produced by carrying out in the same manner as in Comparative Example 3, the adhesive for displays as shown in Tables 1 to 4 is obtained by changing the content of the first antistatic agent which is represented by the chemical formula 4 and is liquid at 25 ° C. The sheet was manufactured.

<Experimental example>

1. 1. Evaluation of the release force of the release film, the adhesive force of the base film, the peeling force of the protective film, and the release band voltage The adhesive sheet for display is 1 inch wide with respect to the adhesive sheet for display manufactured by Examples and Comparative Examples. After cutting with, peel off at 180 ° at a speed of 40 mm per second, measure the release force of the release film, cut the adhesive sheet for display with a width of 1 inch to remove the release film, and then the surface. After 24 hours have passed, the film was peeled off at 180 ° at a rate of 5 mm per second to measure the adhesive strength of the first adhesive layer, and the laminate containing the base film and the protective film was 1 inch wide. The protective film is peeled off at 180 ° at a speed of 40 mm per second, the peeling force between the base film and the protective film is measured, the adhesive sheet for display is cut to 100 × 100 mm, and then 80 mm per second. The release film was peeled off at a speed of 180 °, and the peeling band voltage (V) of the first adhesive layer was measured. This was repeated 5 times, and when the average value was 0.05 kV or less, it was marked with ◯, and when it exceeded 0.05 kV, it was marked with x, and it is shown in Tables 1 to 4 below.

2. 2. Evaluation of Adhesion Workability For the process of adhering the display adhesive sheet manufactured in the above Examples and Comparative Examples to the display, the process error is evaluated three times as described below to evaluate the workability of the adhesion process. Then, they are shown in Tables 1 to 4 below.

2- (1) Evaluation of errors in primary workability In the process of adhering the display adhesive sheet manufactured according to Examples and Comparative Examples to the display, at the stage of peeling the release film from the display adhesive sheet, 1 The error during the primary work was evaluated by marking it as ◯ when it was peeled off by performing it twice or more and × when it was peeled off after performing it twice or more. This was repeated 100 times, and the ratio of errors (x) occurring out of 100 times is shown in Tables 1 to 4 below.

2- (2) Evaluation of errors in secondary workability In the process of adhering the display adhesive sheet produced in Examples and Comparative Examples to the display, the stacking including the base film and the protective film from which the release film was peeled off. At the stage of adhering the body, if the area off the display device, which is the adherend surface, is 0.1% or less of the total area of the laminated body, mark ○, and if it exceeds 0.1% of the total area, mark x. Evaluated the error during the secondary work. This was repeated 100 times, and the ratio of errors (x) occurring out of 100 times is shown in Tables 1 to 4 below.

2- (3) Evaluation of errors in tertiary workability In the process of adhering the display adhesive sheet produced in Examples and Comparative Examples to the display, the protective film is formed by a laminate containing the adhered base film and protective film. Among the steps of peeling, when the peeling was performed once, the error was evaluated as ◯, and when the peeling was performed twice or more, the peeling was performed as x, and the error during the tertiary work was evaluated. This was repeated 100 times, and the ratio of errors (x) occurring out of 100 times is shown in Tables 1 to 4 below.

3. 3. Evaluation of Adhesive Performance of Adhesive Sheet for Display The base film of the adhesive sheet for display manufactured according to Examples and Comparative Examples was adhered to the lower part of the display with a roll laminator at room temperature, and after 24 hours had passed, the temperature was 60 ° C. and the humidity. It is a method of checking whether the peeling phenomenon occurs on the attached lower adhesive sheet by leaving it for 500 hours under 90% condition. If the peeling phenomenon does not occur, mark it as ○, and if it does occur, mark it as ×. The adhesive performance of the base film was evaluated. This is shown in Tables 1 to 4 below.

4. Corrosion Prevention Evaluation of Adhesive Material The release film of the adhesive sheet for display manufactured according to Examples and Comparative Examples was peeled off at the bottom, and it was attached to the SUS304 adherend at room temperature with a roll laminator, and then 24 hours passed. Later, it was left to stand for 500 hours under the conditions of a temperature of 60 ° C. and a humidity of 90%, and then taken out at room temperature and the surface condition of the adherend was observed to evaluate the corrosiveness. At this time, if corrosion of the adherend did not occur, it was evaluated as ◯, and if corrosion of the adherend occurred, it was evaluated as × to prevent corrosion of the adherend. This is shown in Tables 1 to 4 below.

As can be seen from Tables 1 to 4, the content of the preferred first antistatic agent, the content of the second antistatic agent, the acid value of the first main agent resin, the second main agent resin, and the first antistatic agent according to the present invention. And Examples 1, Example 3, Example 4, Example 7, Example 8, Example 10, Example 11, Example 13 and Example 14 satisfying all types of the second antistatic agent and the like. Adhesive strength is excellent as compared with Example 2, Example 5, Example 6, Example 9, Example 12, Example 15 and Comparative Examples 1 to 8 in which even one of them is missing, and at the time of adhesion. It can be confirmed that the workability is excellent, the result of the adhesive performance evaluation of the adhesive sheet for display is excellent, and the corrosion of the adherend is prevented.

Although one embodiment of the present invention has been described above, the idea of the present invention is not limited to the examples presented in the present specification, and those skilled in the art who understand the idea of the present invention are configured within the same idea. Other embodiments can be easily proposed by adding, changing, deleting, adding, etc., which can be said to be within the scope of the idea of the present invention.

110, 111: Release film 120, 120', 120 ": Base film 121, 121', 121": First adhesive layer 122, 122', 122 ": First base film 130, 130': Protective film 131, 131': Second adhesive layer 132, 132': Second base material 200: Laminated body 300: Display

Claims (15)

Through a first composition containing a first base material and a first base resin having an acid value of 40 to 80 mgKOH / g and a first antistatic agent having a solid phase at 25 ° C. formed on the upper surface of the first base material and the first base material. A base film containing the formed first adhesive layer; and a protective film containing a second adhesive layer adhered to the lower surface of the first base material and a second base material formed on the lower surface of the second adhesive layer; Including
The first antistatic agent saw contains a cationic salt containing nitrogen onium salt having a substituted or unsubstituted aryl group,
The first antistatic agent is a compound represented by the following chemical formula 3.

Adhesive sheet for display. The pressure-sensitive display adhesive sheet according to claim 1, wherein the first composition contains the first antistatic agent in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the first main agent resin. The pressure-sensitive adhesive sheet for a display according to claim 1, wherein the first main agent resin is an acrylic copolymer. The first aspect of the present invention, wherein the second adhesive layer is formed through a second composition containing a second main agent resin having an acid value of 35 to 75 mgKOH / g and a second antistatic agent which is a solid phase at 25 ° C. Adhesive sheet for display. The pressure-sensitive display adhesive sheet according to claim 4 , wherein the second composition contains 0.01 to 2 parts by weight of the second antistatic agent with respect to 100 parts by weight of the second main agent resin. The pressure-sensitive adhesive sheet for a display according to claim 4 , wherein the second main agent resin is an acrylic copolymer. The pressure-sensitive adhesive sheet for a display according to claim 1, wherein the first base material and the second base material are PET base materials. The pressure-sensitive adhesive sheet for a display according to claim 1, wherein at least one surface of the first base material and the second base material is antistatic treated. The pressure-sensitive adhesive sheet for a display according to claim 1, further comprising a release film provided on the upper surface of the first pressure-sensitive adhesive layer, which is adhered by the first pressure-sensitive adhesive layer and has an antistatic treatment on one side. The adhesive sheet for a display according to claim 9 , wherein the release film has a silicon release treatment on the lower surface. The adhesive sheet for a display according to claim 9 , wherein the release force between the base film and the release film is 1 to 7 gf / in. The adhesive sheet for a display according to claim 1, wherein the base film has a transmittance of 88% or more and a haze of 0.5 to 2%. The adhesive sheet for a display according to claim 1, wherein the base film has an adhesive strength of 1,300 gf / in or more measured by the following measuring method:
[Measuring method]
After 24 hours had passed since the base film was attached to glass, the adhesive strength when the base film was peeled off at a rate of 5 mm per second by 180 ° was measured. A step of peeling the release film from the adhesive sheet for display according to any one of claims 9 to 11 .
A method of applying an adhesive sheet for a display, which comprises a step of adhering a base film and a protective film from which a release film has been peeled off to a display; and a step of peeling a protective film from the adhered base film and the protective film. A display comprising the base film according to any one of claims 1 to 13 .

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