KR101385039B1 - Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same - Google Patents

Abstract

상기식에서, P₂는 60℃/90% 상대습도의 조건에서 240시간 동안 방치한 후 저항이며, P₁은 초기저항임. The adhesive composition of this invention is a (meth) acryl-type copolymer; Amino silane compounds; And a crosslinking agent, and after curing, a resistance change (ΔR) represented by the following Equation 1 is less than 5%. The pressure-sensitive adhesive composition is excellent in durability and cutting properties and can minimize excessive ITO corrosion and at the same time improve the amount of landfill:
[Equation 1]

In the above formula, P ₂ is the resistance after standing for 240 hours at 60 ℃ / 90% relative humidity conditions, P ₁ is the initial resistance.

Description

Adhesive composition, adhesive film, manufacturing method thereof and display member using the same {Adhesive Composition, Adhesive Film Comprising the Same, Method for Preparing the Adhesive Film and Display Member Using the Same}

The present invention relates to a pressure-sensitive adhesive composition, pressure-sensitive adhesive film, a manufacturing method thereof and an optical member using the same. More specifically, the present invention introduces an amino silane-based compound into a specific (meth) acrylic copolymer to capture acid or form an amide bond to improve the durability and cutting properties of the pressure-sensitive adhesive, minimize ITO corrosion, and at the same time improve the excessive landfill characteristics. It relates to a pressure-sensitive adhesive composition, an adhesive film, a method for producing the same, and an optical member using the same.

The capacitive touch pad is attached to a window or film positioned on an upper surface of the capacitive touch pad and a light-transparent adhesive to detect a change in capacitance in the window or film to exhibit characteristics. Glass, PMMA, PC, etc. may be used as the window, and problems such as lifting, bubble generation, warpage, and ITO patterns may occur when the environment changes depending on the type of the material.

In general, the light-transparent pressure-sensitive adhesive is composed of an acrylic monomer, and includes an acid component such as acrylic acid. Accordingly, various acids present in the light transparent adhesive oxidize ITO on the touch pad side, thereby increasing the resistance of the ITO, thereby lowering the characteristics of the touch pad.

Therefore, there is a demand for development of a pressure-sensitive adhesive suitable for a pressure-sensitive adhesive for touch screens, while having excellent durability and cutting property and effectively suppressing resistance change of the electrode layer under severe conditions.

One object of the present invention is to provide a pressure-sensitive adhesive composition that is excellent in durability and cutting properties and can improve the buried properties while minimizing ITO corrosion.

Another object of the present invention is to provide a pressure-sensitive adhesive composition that can effectively suppress the resistance change of the electrode layer under severe conditions.

Still another object of the present invention is to provide a pressure-sensitive adhesive composition which does not cause end lifting, bubbles, warpage, or light leakage.

Still another object of the present invention is to provide a pressure-sensitive adhesive composition which can be easily coated with a solvent-free type and can thicken a film thickness.

Another object of the present invention to satisfy the durability using the pressure-sensitive adhesive composition and to provide an acid-free pressure-sensitive adhesive film and its manufacturing method.

Still another object of the present invention is to provide a display member using the adhesive film.

One aspect of the present invention relates to an adhesive composition. In one embodiment the pressure-sensitive adhesive composition is a (meth) acrylic copolymer; Amino silane compounds; And a change in resistance (ΔR) represented by the following Equation 1 after curing, including a crosslinking agent and having finished heating at least 90% of the amount of heat generated in the foreground:

[Equation 1]

In the above formula, P ₂ is the resistance after standing for 240 hours at 60 ℃ / 90% relative humidity conditions, P ₁ is the initial resistance.

The (meth) acrylic copolymer may contain an alicyclic group.

The (meth) acrylic copolymer may have a viscosity of 1000 to 2500 cp at 25 ℃.

In embodiments wherein the (meth) acrylic copolymer is a C _{1 -20} alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylate, hydroxyl group-containing monomers and copolymers of one monomer mixture comprising a carboxyl group-containing monomer Can be.

The pressure-sensitive adhesive composition may have an acid value of zero.

In an embodiment, the equivalent ratio of the carboxyl group-containing monomer and the amino silane compound may be 1: 1.01 to 1: 3.

The pressure-sensitive adhesive composition is 100 parts by weight of the (meth) acrylic copolymer, 0.1 to 10 parts by weight of the amino silane compound; And 0.01 to 10 parts by weight of the crosslinking agent.

Another aspect of the present invention relates to an adhesive film formed by curing the pressure-sensitive adhesive composition.

The adhesive film may have a thickness of 100 μm to 2 mm.

Another aspect of the invention relates to a method for producing the pressure-sensitive adhesive film. The method to prepare a (meth) acrylic copolymer by polymerizing a monomer mixture comprising alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylate, hydroxyl group-containing monomers and carboxyl group-containing monomer of the C _{1 -20} ; Preparing an adhesive composition by mixing an amino silane compound and a crosslinking agent with the (meth) acrylic copolymer; And coating and curing the pressure-sensitive adhesive composition.

The (meth) acrylic copolymer does not include a solvent and may have a viscosity of 1000 to 4000 cp at 25 ° C.

The curing may be UV curing.

Another aspect of the present invention relates to a display member. Wherein the display member comprises: an optical film; And the adhesive film attached to one or both surfaces of the optical film.

In an embodiment, the optical film may be a polarizing film.

In an embodiment, the optical film may be an ITO film.

The present invention has excellent durability and cutting property, minimizes ITO corrosion and at the same time effectively suppresses the resistance change of the electrode layer under severe conditions, and does not cause end lifting, bubbles, warpage, or light leakage, and is easy to coat with a solvent-free type. By using the pressure-sensitive adhesive composition and the pressure-sensitive adhesive composition capable of thickening the film thickness, it is possible to provide durability and acid-free pressure-sensitive adhesive film and a method of manufacturing the same. The present invention can also provide a display member using the adhesive film.

Unless stated otherwise in the specification, "(meth) acryl" means that both "acryl" and "methacryl" are possible.

The adhesive composition of this invention is a UV curable type | mold, It is a (meth) acrylic-type copolymer; Amino silane compounds; And crosslinking agents. Hereinafter, each component of the present invention will be described in detail below.

(Meth) acrylic copolymer

In embodiments wherein the (meth) acrylic copolymer is a C _{1 -20} alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylates, be a copolymer of a monomer mixture comprising a hydroxyl group-containing monomers and carboxyl group-containing monomeoeul have.

Examples of the C _{1 -20} alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (Meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl And is not necessarily limited thereto. These may be used alone or in combination of two or more. Here, (meth) acrylate means both acrylate and methacrylate. Alkyl (meth) acrylate of the above C _{1 -20} are the (meth) acrylic copolymer may comprise from 60 to 95% by weight. In the above-mentioned range, bubbles and floating are not generated under heat and humidity conditions, and durability is excellent.

The alicyclic containing (meth) acrylate includes isobonyl (meth) acrylate, carbonyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like, but is not necessarily limited thereto. These may be used alone or in combination of two or more. The cycloaliphatic-containing (meth) acrylate may be included in 0.5 to 20% by weight of the (meth) acrylic copolymer. In the above range, no bubbles or floating occurs under heat and moisture resistant conditions, and have excellent durability.

Examples of the monomer having a hydroxy group include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 2-hydroxybutyl (meth). Acrylate, 6-hydroxyhexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, chloro-2-hydroxypropyl acrylate, diethylene glycol mono (meth) acrylate, allyl Alcohol, and the like, but is not necessarily limited thereto. These may be used alone or in combination of two or more. The cycloaliphatic-containing (meth) acrylate may be included in 0.5 to 25% by weight of the (meth) acrylic copolymer. Excellent adhesion and durability in the above range, the bubble does not occur even in the humidity conditions.

Examples of the carboxyl group-containing monomers include (meth) acrylic acid, 2-carboxyethyl (meth) acrylate, 3-carboxypropyl (meth) acrylate, 4-carboxybutyl (meth) acrylate, itaconic acid, crotonic acid, and maleic acid. And fumaric acid and maleic anhydride. The monomer having a carboxyl group may be included in 0.01 to 10% by weight of the total monomer components. Preferably it is 0.1 to 3 weight%. It is excellent in durability in the said range, and excellent in adhesive force.

The (meth) acrylic copolymer may be polymerized by adding other copolymerizable monomers in addition to the above-mentioned monomers. For example, monomers having birefringence in the same amount as aromatic (meth) acrylates can also be added and polymerized as necessary.

The (meth) acrylic copolymer may be polymerized after adding an initiator to each monomer component. The polymerization is carried out until the 25 ° C viscosity of the (meth) acrylic copolymer becomes a viscous liquid of about 1000 to 4000 cps. Coating is easy in the said viscosity range, and workability is excellent.

The (meth) acrylate-based binder may have a weight average molecular weight of 100,000 to 3,000,000 g / mol. Excellent adhesion and durability in the above range. Preferably from 150,000 to 2,500,000 g / mol.

The (meth) acrylate-based binder may have a glass transition temperature (Tg) of -50 to -10 ° C, preferably -30 to -15 ° C. It is excellent in durability adhesiveness in the said range.

The (meth) acrylic copolymer of the present invention does not require a step of dissolving in a separate solvent during the polymerization and coating process. That is, since it is applied as a solvent-free process, not only the process is easy and the coating process is easy, but also the manufacture of the adhesive film of the thick thickness of 100 micrometers-2 mm is possible.

The initiator may preferably be applied to a photoinitiator. The photoinitiator is activated by ultraviolet rays or electron beams to activate a carbon-carbon double bond in the pressure-sensitive adhesive film to generate a radical reaction. Specific examples include, but are not limited to, alpha-hydroxy ketone type compounds, benzyl ketal type compounds, or mixtures thereof. Preferably, the alpha-hydroxy ketone type compound is 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy 2-methyl-1-phenyl-1-propanone, 2-hydroxy-1- [4- (2-hydroxyethoxy) phenyl] -2-methyl-1-propanone and the like can be used. The photoinitiators may be used alone or in combination of two or more thereof. The photoinitiator may be applied to 0.001 to 3 parts by weight, preferably 0.001 to 1 part by weight based on 100 parts by weight of the (meth) acrylic copolymer. Within this range, transparency and excellent durability can be obtained.

Amino silane compounds

The amino silane compound is 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, (aminoethylaminomethyl) phenethyltrimethoxysilane, (aminoethylaminomethyl) phenethyltriethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldiethoxysilane, N- (2-aminoethyl) -3-aminopropyltri Methoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 4-aminobutyltrimethoxysilane, 4-aminobutyltriethoxysilane, 3-aminopropylmethyldiethoxysilane, 3 -Aminopropylmethyldimethoxysilane, 3-aminopropyldimethylmethoxysilane, 3-aminopropyldimethylethoxysilane, 2,2-dimethoxy-1-aza-2-silacyclopentane-1-ethanamine, 2, 2-diethoxy-1-aza-2-silacyclopentane-1-ethanamine, 2,2-diethoxy-1-aza-2-silacyclopentane, 2,2-dimethoxy-1-aza-2- room Cyclopentane, 4-aminophenyl trimethoxysilane, 3-phenyl-aminopropyl may be used, such as a silane, but are not necessarily limited thereto. These may be used alone or in combination of two or more.

The amino silane compound may be used in an amount of 0.1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylic copolymer. Acid capture or amide bonds in the above range to increase the durability and cutting properties of the adhesive, it is possible to minimize the corrosion of ITO.

In an embodiment, the equivalent ratio of the carboxyl group-containing monomer and the amino silane compound used in the preparation of the (meth) acrylic copolymer may be 1: 1.01 to 1: 3. Excellent acid capture performance in the above range has the advantage that less free acid.

Cross-linking agent

The (meth) acrylic copolymer may be mixed with a crosslinking agent to form an adhesive composition.

As the crosslinking agent, a polyfunctional (meth) acrylate capable of curing with an active energy ray may be preferably used.

In a specific example, the polyfunctional (meth) acrylate is 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol Di (meth) acrylate, neopentylglycol adipate di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, Ethylene oxide modified di (meth) acrylate, di (meth) acryloxy ethyl isocyanurate, allylated cyclohexyl di (meth) acrylate, tricyclodecanedimethanol (meth) acrylate, dimethylol Dicyclopentanedi (meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, neopentylglycol modified trimeth Bifunctional such as propane di (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene Sex acrylates; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethyl isocyanurate; Tetrafunctional acrylates such as diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate; Pentafunctional acrylates such as dipentaerythritol penta (meth) acrylate; And dipentaerythritol hexa (meth) acrylate, caprolactone-modified dipentaerythritol hexa (meth) acrylate or urethane (meth) acrylate (e.g., an isocyanate monomer and trimethylolpropane tri Hexafunctional acrylates such as acrylonitrile-butadiene-acrylonitrile-butadiene-acrylonitrile, and the like, but are not limited thereto. They may be used alone or in combination of two or more.

An isocyanate-based, epoxy-based, aziridine-based, melamine-based, amine-based, imide-based, carbodiimide-based, amide-based cross-linking agent or a combination thereof may be used.

The content of the crosslinking agent in the present invention is 0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight, more preferably 0.5 to 2 parts by weight based on 100 parts by weight of the (meth) acrylic copolymer.

The pressure-sensitive adhesive composition may optionally contain a silane coupling agent, a curing accelerator, an ionic liquid, a lithium salt, an inorganic filler, a softener, an antioxidant, an antioxidant, a stabilizer, a tackifying resin, and a modified resin (polyol resin, phenol resin, acrylic). Resins, polyester resins, polyolefin resins, epoxy resins, epoxidized polybutadiene resins, and the like), leveling agents, antifoaming agents, plasticizers, dyes, pigments (colored pigments, extender pigments, etc.), treatment agents, sunscreen agents, fluorescent whitening agents, Conventional additives such as dispersants, heat stabilizers, light stabilizers, ultraviolet absorbers, antistatic agents, lubricants and solvents may be further included.

The pressure-sensitive adhesive film of the present invention may be formed by curing the pressure-sensitive adhesive composition. For example, after the adhesive composition is coated on a release film, it may be thermally cured or photocured. Preferably UV cured. In an embodiment the UV curing can be carried out under 50mW / cm 2 conditions using a low pressure lamp.

The coating thickness is not particularly limited, and may form an adhesive layer having a thickness of 50 μm to 2 mm, for example, 150 μm to 1.5 mm. In addition, it may be preferably cured in a state in which oxygen is blocked during curing.

The adhesive film finally cured as described above may have a modulus of 1 * 10 ^ 5 to 5 * 10 ^ 7 dyne / cm ² at 30 ° C. by a frequency sweep test method. In the above range, excellent durability aimed at the present invention can be obtained.

In addition, the adhesive film has a resistance change (ΔR) represented by the following Equation 1 after curing is less than 5%, preferably less than 2%. The term 'curing', when measured using DSC, means that more than 90% of the calorific value of the foreground heat has been generated:

[Equation 1]

In the above formula, P ₂ is the resistance after standing for 240 hours at 60 ℃ / 90% relative humidity conditions, P ₁ is the initial resistance.

Another aspect of the present invention relates to a display member. Wherein the display member comprises: an optical film; And the adhesive film attached to one or both surfaces of the optical film. The optical film may include a polarizing plate, a color filter, a retardation film, an elliptical polarizing film, a reflection film, an antireflection film, a compensation film, a brightness enhancement film, an alignment film, a light diffusion film, a glass scattering prevention film, a surface protection film, a plastic LCD substrate, ITO film etc. are mentioned. The manufacturing method of the optical film can be easily manufactured by those skilled in the art to which the present invention pertains.

For example, a touch panel can be formed by attaching a touch pad to a window or an optical film using the adhesive film.

Or it may be applied as an adhesive film to a conventional polarizing film as in the prior art.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example

Example  One

74 parts by weight of ethylhexyl acrylate, 10 parts by weight of isobornyl acrylate, 15 parts by weight of hydroxy ethyl acrylate, 1 part by weight of acrylic acid and Irgacure ™ 651 (2,2-dimethoxy-2-phenyl as photopolymerization initiator Acetophenone) (manufactured by Ciba Japan K. K.) was mixed in a glass vessel to prepare a mixture. The mixture was partially polymerized by ultraviolet irradiation using a low pressure lamp (Sylvania BL Lamp) of 50 mw / cm 2 or less to obtain a (meth) acrylic copolymer having a viscosity of about 2,000 cP. 0.99 parts by weight of an amino silane compound (manufactured by z-6011: dow chemical) to the resulting (meth) acrylic copolymer, 0.2 part by weight of HDDA (1,6-hexanediol diacrylate) as a crosslinking agent and a polymerization initiator (irga 0.3 weight part of cure 651) was added, and the adhesive composition was prepared. The resulting pressure-sensitive adhesive composition was coated onto a 50 μm thick polyester film (release film) to form an adhesive film with a thickness of 175 μm. After covering a 50 μm-thick polyester film (release film) on the adhesive film, the both sides of the release film were irradiated with a low pressure lamp (Sylvania BL Lamp) for 6 minutes to obtain a transparent adhesive film.

Example  2

As in Table 1, it was carried out in the same manner as in Example 1 except that only the monomer content was changed.

Comparative Example  One

Except that acrylic acid was not applied to prepare the (meth) acrylic copolymer was performed in the same manner as in Example 1.

Comparative Example  2

The same procedure as in Example 1 was carried out except that 3-glyoxymethoxypropylmethoxy silane (KBM-403: manufactured by Shin-Yetsu Chemical Co., Ltd.) was applied instead of the amino silane compound.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Acrylic copolymer EHA 74 77 75 74 IBOA 10 12 10 10 HEA 15 10 15 15 AA One One - One Aminosilane 0.99 0.99 One - Aminosilane /
Acrylic acid equivalent ratio 1.01 1.01 - - Epoxy silane
Coupling agent - - - One Cross-linking agent 0.2 0.2 - 0.2 Manufacturing method UV curing UV curing UV curing UV curing Resistance change (△%)  <2 <2  <2 7 Peel strength 2100 2210 1930 2200 durability O O X O

Property evaluation

(1) Resistance change: The prepared adhesive film was attached to ITO PET, and a sample was prepared by forming electrodes using silver paste on both sides. Thereafter, the initial resistance (P1) was measured on the prepared sample, and the sample was left for 240 hours under the condition of 60 ° C / 90% RH, and then the resistance (P2) was measured. At this time, the resistance was measured using a Checkman portable resistance, voltage, and current measuring instrument (made by Taekwang Electronics). Then, the resistance change rate (ΔR) was measured by substituting the resistance value measured under each condition as shown in Equation 1 below:

[Equation 1]

In the above formula, P ₂ is the resistance after standing for 240 hours at 60 ℃ / 90% relative humidity conditions, P ₁ is the initial resistance.

(2) Using a PET film (backing film) having a thickness of 50 μm in peeling strength (gf / 25 mm), the prepared adhesive film was attached to the ITO film, and at 30 minutes after the attachment, TA.XT_Plus Texture Analyzer Peeling force was measured using (Stable Micro System (made)). Peel force was measured at a rate of 300 mm / min.

(3) Durability: After bonding PC film / ITO film / Glass and PET film, it is allowed to stand at 60 ^o C / 90% relative humidity for 500 hours, and then there is no lifting or peeling or bubbles on the surface. Observed visually and evaluated by the following criteria.

Good: Good (no bubbles or peeling)

?: Good (bubbles or peeling phenomenon somewhat)

X: poor (large amount of bubbles or peeling occurred)

As shown in Table 1, in the case of the Example, the resistance change is low and the peel strength and durability is excellent, while Comparative Example 1 without acrylic acid is less durable, instead of the amino silane compound 3-glycithoxy propylmeth It can be seen that in Comparative Example 2 to which the oxysilane was applied, the resistance change greatly increased.

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

Claims (16)

(Meth) acrylic copolymers; Amino silane compounds; And a pressure-sensitive adhesive composition comprising a crosslinking agent and having a resistance change (ΔR) of less than 5% represented by Equation 1 after curing:

[Equation 1]

In the above formula, P ₂ is the resistance after standing for 240 hours at 60 ℃ / 90% relative humidity conditions, P ₁ is the initial resistance.

The pressure-sensitive adhesive composition of claim 1, wherein the (meth) acrylic copolymer contains an alicyclic group.
The pressure-sensitive adhesive composition of claim 1, wherein the (meth) acrylic copolymer has a viscosity of 1000 to 2500 cps at 25 ° C.
The method of claim 1, wherein the (meth) acrylic copolymer is a monomer containing a C _{1 -20} alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylate, hydroxyl group-containing monomers and carboxyl group-containing monomer mixture Pressure-sensitive adhesive composition, characterized in that the copolymer.
The pressure-sensitive adhesive composition of claim 1, wherein the pressure-sensitive adhesive composition has an acid value of zero.
The pressure-sensitive adhesive composition according to claim 4, wherein the equivalent ratio of the carboxyl group-containing monomer and the amino silane compound is 1: 1.01 to 1: 3.
100 parts by weight of the (meth) acrylic copolymer, 0.1 to 10 parts by weight of the amino silane compound; And 0.01 to 10 parts by weight of a crosslinking agent,
The (meth) acrylic copolymer, characterized in that a copolymer of a monomer mixture comprising a C _{1 -20} alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylate, hydroxyl group-containing monomers and carboxyl group-containing monomer Pressure-sensitive adhesive composition.
The pressure-sensitive adhesive composition of claim 7, wherein the (meth) acrylic copolymer is polymerized with a solvent.
The adhesive film formed by hardening | curing the adhesive composition of any one of Claims 1-8.
The pressure-sensitive adhesive film of claim 9, wherein the pressure-sensitive adhesive film has a thickness of 50 μm to 2 mm.
A C _{1 -20} alkyl (meth) acrylate, cycloaliphatic-containing (meth) acrylate, hydroxyl group-containing monomer and a carboxyl group-containing monomer prepared by polymerizing a monomer mixture (meth) acrylic copolymer comprising and;
Preparing an adhesive composition by mixing an amino silane compound and a crosslinking agent with the (meth) acrylic copolymer; And
Coating and curing the pressure-sensitive adhesive composition;
Method of producing an adhesive film comprising the step.
12. The method of claim 11, wherein the (meth) acrylic copolymer does not include a solvent and has a viscosity of 1000 to 2500 cps at 25 ° C.
The method of claim 11, wherein said curing is UV curing.
Optical film; And
The adhesive film of claim 8 attached to one or both surfaces of the optical film;
Display member comprising a.
The display member of claim 14, wherein the optical film is a polarizing film.
The display member according to claim 14, wherein the optical film is an ITO film.