KR20150104489A - Adhesive film and optical display comprising the same - Google Patents

Abstract

The present invention relates to an adhesive film having a surficial energy at 25°C of 26.6 mN/m or more, and to an optical display device including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to an adhesive film, and an optical display device including the adhesive film.

The present invention relates to an adhesive film and an optical display device including the same. More specifically, the present invention relates to a pressure-sensitive adhesive film which does not cause whitening even when it is allowed to stand at room temperature after high-temperature and high-humidity standing, and an optical display device including the same.

The capacitive touchpad acts as a patterned conductive film and a window or film that is adhered to an optical clear adhesive (OCA) film by sensing the change in capacitance in the window or film. In the case of the patterned conductive film, the ITO pattern is oxidized by the acid present in the OCA film, thereby increasing the ITO resistance. .

When the OCA film is left at a high temperature and / or a high humidity, the film absorbs water. When the OCA film is left at room temperature again, the water absorbed in the film lowers the external temperature and condenses, resulting in phase separation between the film and water, Due to the difference in refractive index between the film and the film. Therefore, recent OCA films are required to have a high-temperature and / or high-humidity environment even during the transfer process or after the final manufacturing process, thereby requiring no OCA film. In this connection, International Publication No. 2013-0035977 discloses a retardation film and a method for producing the same.

An object of the present invention is to provide an adhesive film which does not cause whitening after high temperature and / or high humidity storage.

Another object of the present invention is to provide a pressure-sensitive adhesive film having good compatibility with water and having no phase separation.

The adhesive film of the present invention may have a surface energy of 26.6 mN / m or more at 25 占 폚.

The optical display device of the present invention may include the above-mentioned pressure-sensitive adhesive film.

The present invention provides a pressure-sensitive adhesive film which does not cause whitening after high-temperature and / or high-humidity storage. The present invention provides a pressure-sensitive adhesive film which is excellent in miscibility with water and does not cause whitening.

1 is a cross-sectional view of an OLED display device according to an embodiment of the present invention.
2 is a cross-sectional view of an OLED display device according to another embodiment of the present invention.

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification. In the present specification, 'upper' and 'lower' are defined with reference to the drawings, and 'upper' may be changed to 'lower' and 'lower' 'May mean acrylate and / or methacrylate.

The adhesive film of one embodiment of the present invention may have a surface energy of 26.6 mN / m or more at 25 占 폚. If the surface energy is less than 26.6 mN / m, when the adhesive film is left at a high temperature and / or a high humidity and then left at a room temperature (for example, 25 ° C), whitening may occur in the adhesive film and haze may occur. The haze-formed adhesive film has low transparency and can not be used in an optical display device. Specifically, the surface energy of the adhesive film may be 26.6 to 34.7 mN / m at 25 占 폚. The surface energy of the adhesive film may be 34.7 mN / m or less. If the surface energy of the pressure-sensitive adhesive film is 34.7 mN / m or less, there is no possibility of corrosion of the ITO and the initial adhesive strength is reduced due to the high polarity.

The adhesive film may have a water contact angle of 78 ° or more, specifically 78 to 96 ° at 25 ° C, and a contact angle of hexadecane at 25 ° C may be 6 ° or more, specifically 6 to 26 °, / Or left in high humidity and left at room temperature, whitening may not occur in the adhesive film.

Specifically, the moisture permeability of the pressure-sensitive adhesive film is preferably from 400 to 400 g / m < 2 > at 25 DEG C and a relative humidity of 100 to 100 g / m < 2 > ² · day or less, for example, may be a 65 to 200g / m ² · day, it can be a whitened even under high temperature and / or humidity does not occur in this range.

The adhesive film may be formed of a pressure-sensitive adhesive composition of one embodiment of the present invention including a (meth) acrylic copolymer containing a polar monomer for compatibility with water. Hereinafter, the pressure-sensitive adhesive composition of one embodiment of the present invention will be described . The pressure sensitive adhesive composition of one embodiment of the present invention may include a (meth) acrylic copolymer, a crosslinking agent and a photopolymerization initiator.

The (meth) acrylic copolymer may include a polar monomer (for example, a polar (meth) acrylic monomer) for preventing whitening of the pressure-sensitive adhesive film. Specifically, the (meth) acrylic copolymer may be a copolymer of a monomer mixture containing more than 10% by weight, for example, 15 to 40% by weight of a polar monomer. In the above range, the pressure-sensitive adhesive film may be free of whitening and may not have phase separation with water.

The polar monomer may include a (meth) acrylic monomer having a hydroxyl group, a (meth) acrylic monomer having a carboxylic acid group, or a mixture thereof.

The (meth) acrylic monomer having a hydroxyl group is an alkyl group having 1-20 carbon atoms having at least one hydroxyl group, a cycloalkyl group having 5-20 carbon atoms having at least one hydroxyl group, or an aryl group having 6-20 carbon atoms having at least one hydroxyl group (Meth) acrylic acid esters having (meth) acrylic acid esters. (Meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 6- (Meth) acrylate, and hydroxyhexyl (meth) acrylate. In particular, by using a (meth) acrylic monomer containing an alkyl group having 1 to 5 carbon atoms and having a hydroxyl group, an adhesive strength increasing effect can be further obtained.

The (meth) acrylic monomer having a hydroxyl group in the monomer mixture may be contained in an amount of from 6 to 40% by weight, for example, from 6 to 23% by weight, and there is no cloudiness in the above range and an excellent effect of adhesion and stress relaxation .

The (meth) acrylic monomer having a carboxylic acid group may include a carboxylic acid having a vinyl group, or a (meth) acrylic acid ester having a carboxylic acid group. For example, the monomer may mean at least one of? -Carboxyethyl (meth) acrylate and (meth) acrylic acid, but is not limited thereto. The (meth) acrylic monomer having a carboxylic acid group in the monomer mixture may be contained in an amount of 0 to 15% by weight, for example, 0 to 2% by weight, and may have an excellent adhesive strength and an excellent reliability in the above range.

(Meth) acrylic copolymer is a copolymer of a monomer mixture further comprising at least one of a (meth) acrylic monomer having an alkyl group in addition to a polar monomer, a (meth) acrylic monomer having an alicyclic group, and a (meth) acrylic monomer having a heterocyclic group Lt; / RTI >

The (meth) acrylic monomer having an alkyl group may include an unsubstituted (meth) acrylic acid ester having a linear or branched alkyl group having 1 to 20 carbon atoms. (Meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, (Meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, ethylhexyl (meth) acrylate, octyl Acrylate, decyl (meth) acrylate, and lauryl (meth) acrylate. Preferably, the use of the (meth) acrylic monomer having an alkyl group having 4 to 8 carbon atoms may further increase the initial adhesive strength. The (meth) acrylic monomer having an alkyl group in the monomer mixture may be contained in an amount of 50 to 90% by weight, for example, 55 to 85% by weight, and excellent adhesion and reliability may be excellent in the above range.

The (meth) acrylic monomer having an alicyclic group may include a (meth) acrylic acid ester having a single ring or a heterocyclic alicyclic ring having 4 to 20 carbon atoms. (Meth) acrylic acid esters having a monocyclic or heterocyclic alicyclic ring having 5 to 15 carbon atoms, such as isobornyl (meth) acrylate, cyclopentyl (meth) acrylate Cyclohexyl (meth) acrylate, and the like. The (meth) acrylic monomer having an alicyclic group in the monomer mixture may be contained in an amount of from 0 to 25% by weight, for example, from 0 to 20% by weight, and may have an excellent adhesive strength in the above range.

The (meth) acrylic monomer having a hetero-alicyclic group may be a (meth) acrylic monomer having an alicyclic group having 2 to 5 carbon atoms and having a hetero atom (e.g., oxygen, nitrogen, or sulfur) Meth) acryloylmorpholine. The (meth) acrylic monomer having a hetero-alicyclic group in the monomer mixture may be contained in an amount of from 0 to 25% by weight, for example, from 0 to 20% by weight, and the initial adhesive strength and reliability may be increased in the above range. In particular, the monomer having a hetero-alicyclic group can be used in place of the (meth) acrylic monomer having a carboxylic acid group, thereby realizing the same role but not having a carboxylic acid group, thereby preventing the conductive film (e.g., ITO film) from being corroded by the adhesive film.

In an embodiment, the (meth) acrylic copolymer is a copolymer of 60 to 89% by weight, for example, 65 to 85% by weight of a (meth) acrylic monomer having an alkyl group, 11 to 40% by weight of a (meth) acrylic monomer having a hydroxyl group By weight to 35% by weight, and it may be effective to have excellent adhesion and reliability in the above range.

In another embodiment, the (meth) acrylic copolymer is a copolymer of 60 to 85% by weight, for example, 76 to 85% by weight of a (meth) acrylic monomer having an alkyl group, and 11 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group (Meth) acrylate monomer having 1 to 10% by weight, for example, 1 to 4% by weight of a (meth) acrylic monomer having a heteroalicyclic group, and having excellent adhesion and reliability in the above range Effect can be effective.

In another embodiment, the (meth) acrylic copolymer has from 65 to 85% by weight, for example, from 76 to 85% by weight of a (meth) acrylic monomer having an alkyl group and from 10 to 25% by weight of a (meth) (Meth) acrylic monomer having a carboxylic acid group in an amount of 0.5 to 10% by weight, for example, in an amount of 10 to 20% by weight, It can be effective.

In another embodiment, the (meth) acrylic copolymer is a copolymer of 50 to 75% by weight, for example 55 to 65% by weight of (meth) acrylic monomers having an alkyl group and 11 to 30% by weight of a (meth) And 15-25% by weight of a (meth) acrylic monomer having an alicyclic group and 10-25% by weight, for example 15-25% by weight of a (meth) acrylic monomer having an alicyclic group, Effect can be effective.

In another embodiment, the (meth) acrylic copolymer is a copolymer of 50 to 75% by weight, for example 55 to 65% by weight of (meth) acrylic monomers having an alkyl group and 11 to 30% by weight of a (meth) 15 to 25% by weight of a (meth) acrylic monomer having an alicyclic group, 10 to 25% by weight of a (meth) acrylic monomer having 1 to 10% by weight of a (meth) acrylic monomer having a heterocyclic group, And 5% by weight of the total amount of the monomer mixture, and it is possible to obtain an effect with excellent adhesion and reliability in the above range.

The weight average molecular weight of the (meth) acrylic copolymer may be from 1 million to 3 million g / mol, specifically from 1.5 million to 2.8 million g / mol, and the durability of the pressure-sensitive adhesive film in the above range can be increased

(Meth) acrylic copolymer may have a glass transition temperature of -50 to -13 占 폚, specifically -45 to 20 占 폚, and may have an effect of excellent adhesion and reliability in the above range.

The (meth) acrylic copolymer may be produced by a conventional method. Specifically, it can be prepared by mixing a monomer mixture with a radical photopolymerization initiator, followed by solution polymerization, suspension polymerization, photopolymerization, bulk polymerization, or emulsion polymerization. Specifically, the solution polymerization can be performed by adding an initiator to the monomer mixture and performing the polymerization at 50 to 100 占 폚, and the radical photopolymerization initiator is an acetophenone radical photopolymerization initiator including 2,2-dimethoxy-2-phenylacetophenone Can be used.

The (meth) acrylic copolymer may be prepared by completely polymerizing the monomer mixture, or the monomer mixture may be partially polymerized and then the polymerization may be completed after further adding an initiator and a crosslinking agent. Partial polymerization can be carried out by polymerization of the monomer mixture at a viscosity of 1500 CPS or less, specifically viscosity of 1100 to 3500 CPS at 25 占 폚.

Examples of the crosslinking agent include polyfunctional (meth) acrylates such as 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) (Meth) acrylate, neopentylglycol adipate di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, (Meth) acrylate, di (meth) acryloxyethyl isocyanurate, allyl cyclohexyl di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, (Meth) acrylate, ethylene oxide modified hexahydrophthalic acid di (meth) acrylate, tricyclodecane dimethanol (meth) acrylate, neopentyl glycol modified trimethyl Bifunctional acrylates such as propanediol (meth) acrylate, adamantane di (meth) acrylate or 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] ; (Meth) acrylates such as trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri Trifunctional acrylates such as modified trimethylolpropane tri (meth) acrylate, trifunctional urethane (meth) acrylate or tris (meth) acryloxyethylisocyanurate; 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 But are not limited thereto. These may be used alone or in admixture of two or more. Preferably, the cross-linking agent is a polyfunctional polyhydric alcohol having 2 to 20 hydroxyl groups, (Meth) acrylate, it is possible to obtain an effect of having excellent endurance reliability.

The crosslinking agent may be contained in an amount of 0.001 to 1 part by weight, specifically 0.01 to 0.5 part by weight, specifically 0.1 to 0.15 part by weight, based on 100 parts by weight of the (meth) acrylic copolymer, and has excellent adhesion and reliability in the above range .

The initiator may be a radical type photopolymerization initiator and may be the same as or different from the initiator used in the preparation of the (meth) acrylic copolymer. The initiator may be included in an amount of 0.001 to 1 part by weight based on 100 parts by weight of the (meth) acrylic copolymer, and may exhibit excellent reactivity within the above range.

The pressure-sensitive adhesive composition may optionally contain a silane coupling agent (silane compound), a curing accelerator, an ionic liquid, a lithium salt, an inorganic filler, a softener, an antioxidant, an antioxidant, a stabilizer, A leveling agent, a defoaming agent, a plasticizer, a dye, a pigment (a coloring pigment, an extender pigment, etc.), a treating agent, a sunscreen agent, a fluorescent whitening agent (an antioxidant) , A dispersant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, an antistatic agent, a lubricant and a solvent.

The silane coupling agent may further include an epoxy silane coupling agent, but is not limited thereto. The additive (for example, silane coupling agent) may be contained in an amount of 0.01 to 0.1 part by weight, preferably 0.05 to 0.1 part by weight based on 100 parts by weight of the monomer mixture or the (meth) acrylic copolymer.

The pressure-sensitive adhesive composition may have a viscosity at 25 ° C of 1,000 to 50,000 cPs, and may have an effect of obtaining excellent coating and thickness uniformity in the above range.

The adhesive film can be produced by partially polymerizing a monomer mixture for a (meth) acrylic copolymer, adding a cross-linking agent, an initiator and an additive to the partially polymerized (meth) acrylic monomer, coating the resultant on a release film and curing. Curing may include irradiation at an irradiance of 400 to 1500 mJ / cm < ² > at a wavelength of 300-400 nm with a low pressure lamp in an anoxic state.

The adhesive film may be used as an OCA film, or may be formed on an optical film and used as an adhesive optical film. The optical film may be a polarizing plate. The polarizing plate includes a polarizer, a protective film formed on the polarizer, and may further include a hard coating layer, an antireflection layer, and the like.

The adhesive film may have a thickness of 25 to 300 탆, specifically 50 to 250 탆, and within the above range, it can be used in an optical display device.

The optical display device of one embodiment of the present invention may include the adhesive film or the adhesive optical film. In an embodiment, the optical display device may be an organic light emitting element display device including an adhesive film or a sticky optical film, .

1 is a cross-sectional view of an OLED display device according to an embodiment of the present invention. 1, an organic light emitting diode display 100 includes a substrate 10, an OLED element 15 formed on the substrate 10, a sealing layer 20 for sealing the OLED element 15, A first adhesive film 25 formed on the layer 20 and a substrate 35 formed on the first adhesive film 25 and a first transparent conductive layer 40 formed on the substrate 35 and a substrate 35 A polarizing plate 45 formed on the upper portion of the first transparent conductive layer 40 and a second adhesive film 50 formed on the upper portion of the polarizing plate 45. [ And a window 55 formed on top of the second adhesive film 50 and at least one of the first adhesive film 25 and the second adhesive film 50 may be an adhesive film of the embodiment of the present invention .

The substrate 10 may be a substrate (e.g., a TFT substrate) commonly used in an organic light emitting diode display device. Specifically, the substrate 10 may be a glass substrate, a plastic polyimide, an epoxy, an acrylic, It may be a substrate having flexibility.

Although not shown in FIG. 1, the OLED element 15 includes a first electrode, a second electrode, an organic light emitting layer formed between the first electrode and the second electrode, The organic light-emitting film may be formed by sequentially laminating a hole injection layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer, but is not limited thereto.

The sealing layer 20 protects the OLED element 15 from external moisture or oxygen and may be formed of an inorganic, organic or inorganic / organic mixture.

The transparent conductor includes a base material 35 and a first transparent conductive layer 40 formed on both surfaces of the base material 35 and a second transparent conductive layer 30 can do. The first transparent conductive layer 40 and the second transparent conductive layer 30 may be the same or different from each other. The substrate 35 may be an optical transparent film (e.g., a polyester including polycarbonate, polyethylene terephthalate or the like) And may be an indium tin oxide (ITO) film, or a film containing a metal nanowire. Although not shown in FIG. 1, the first transparent conductive layer 40 and / Or the second transparent conductive layer 30 may be patterned.

The first adhesive film 25 adheres the sealing layer 20 and the second transparent conductive layer 30 and the second adhesive film 50 adheres the first transparent conductive layer 40 and the window 55, May be the same or different, and may include, but not limited to, an adhesive film of one embodiment of the present invention.

The polarizing plate 45 serves as an antireflection film in the organic light emitting display device. Although not shown in FIG. 1, the polarizing plate 45 may include, but not limited to, a polarizer and a protective film formed on the polarizer.

The window 55 serves as a display, and may be formed of glass or a plastic material, or may be formed of a material having flexibility.

2 is a cross-sectional view of an OLED display device according to another embodiment of the present invention. 2, the OLED display 200 includes a substrate 10, an OLED element 15 formed on the substrate 10, a sealing layer 20 for sealing the OLED element 15, A first adhesive film 25 formed on the layer 20, a substrate 35 formed on the first adhesive film 25, and a first transparent conductive layer 40 formed on the upper side of the substrate 35 A polarizing plate 45 formed on the upper portion of the first transparent conductive layer 40, a second adhesive film 50 formed on the upper portion of the polarizing plate 45, a window 55 formed on the upper portion of the second adhesive film 50, And one or more of the first adhesive film 25 and the second adhesive film 50 may be the adhesive film of the embodiment of the present invention.

Except that the second transparent conductive layer 30 is not included in the organic light emitting diode display device of FIG.

In addition, the OLED display according to embodiments of the present invention can drive the apparatus even without the sealing layer 20 and / or the polarizer 45, and the sealing layer 20 and / (45) may be omitted.

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.

Specific specifications of the components used in Examples and Comparative Examples are as follows:

(AA), acryloylmorpholine (ACMO), 2-hydroxyethyl acrylate (HEA), isobornyl acrylate (IBOA), 2- (methacryloyloxyethyl acrylate) Ethylhexyl acrylate (EHA)

(B) Crosslinking agent: 1,6-hexanediol diacrylate

(C) Radical type photopolymerization initiator: IGACURE 651 (2,2-dimethoxy-2-phenylacetophenone) (manufactured by Shiba Japan K.K.)

(D) Silane coupling agent: siloxane-based epoxy silane (X-41-1059A, manufactured by SHINETSU)

Example  One

20 parts by weight of 2-hydroxyethyl acrylate, 80 parts by weight of 2-ethylhexyl acrylate and 0.04 part by weight of Irgacure 651 as a photopolymerization initiator were well mixed in a glass container. The dissolved oxygen in the glass vessel was replaced with nitrogen gas and the mixture was partially polymerized by irradiation with ultraviolet light for a few minutes using a low pressure lamp to obtain a viscous liquid having a viscosity of about 1500 CPS. To the resulting composition, 0.1 part by weight of a silane coupling agent, 0.26 part by weight of an additional photopolymerization initiator, and 0.15 part by weight of a crosslinking agent were added and mixed well. The obtained mixture was coated on a polyester film (release film, polyethylene terephthalate film, thickness: 50 mu m) to a thickness of 175 mu m to prepare a coating layer. The coating layer was covered with a release film and irradiated with a low-pressure lamp for 3 minutes to prepare a transparent pressure-sensitive adhesive sheet containing a pressure-sensitive adhesive film having a thickness of 175 탆.

Example  2 to 6 and Comparative Example  1 to 4

A transparent pressure-sensitive adhesive sheet was produced in the same manner as in Example 1, except that the content of each component in Example 1 was changed to the following Table 1 (unit: parts by weight).

The properties of the transparent pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples were evaluated in the following Table 1, and the results are shown in Table 1 below.

Example Comparative Example One 2 3 4 5 6 One 2 3 4 AA - - One - - - - - - - ACMO - 3 - - 2 - 5 8 - 8 HEA 20 15 15 23 23 23 5 5 5 - IBOA - - - - 20 20 - - 30 - EHA 80 82 84 77 55 57 90 87 65 92 Initiator 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 Cross-linking agent 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 Silane coupling agent 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Surface energy
(mN / m 28.386 26.733 31.913 29.331 33.955 34.684 26.58 26.593 25.192 24.936 Water contact angle (°) 93.18 95.14 84.5 92.3 79.53 78.035 91.61 89.78 74.64 92.75 Hexadecane contact angle (°) 17.1 25.58 6.8 8.8 7.4 6.4 32.1 35.34 6.8 38.84 all sorts of flowers Transparency Transparency Transparency Transparency Transparency Transparency opacity opacity opacity opacity Moisture permeability
(g / m ² .day) 98.845 86.67 91.487 88.773 69.943 87.482 99.856 83.879 67.106 62.102

As shown in Table 1, since the surface energy of the adhesive film of the present invention is within a predetermined range, the film is transparent after the film is left at high temperature and / or high humidity, and the refractive index difference from the adhesive film is low.

On the other hand, it was confirmed that the pressure-sensitive adhesive films of Comparative Examples 1 to 3, which were devoid of the surface energy of the present invention, underwent whitening after high temperature and / or high humidity abatement, had haze, and had a difference in refractive index from the adhesive film.

)을 이용하여 계산하였다. (1) Contact angle and surface energy: The adhesive film obtained by removing the release film from the pressure-sensitive adhesive sheet was measured for water contact angle and hexadecane contact angle using a PX300 device (SEO) at 25 ° C, respectively: Owens-Wendt equation

).

(2) Brightness: The pressure-sensitive adhesive film was allowed to stand at 85 占 폚 and 85% relative humidity at high temperature and high humidity for 24 hours, and then allowed to stand at 25 占 폚 and 55% RH for 30 minutes to judge whether cloudiness of the adhesive film occurred . If cloudiness occurs, the adhesive film becomes cloudy. If no haze occurs, it is considered as 'opaque' because it is not transparent because haze is generated due to the occurrence of whiteness due to lack of whiteness.

(3) Moisture permeability: The adhesive film obtained by removing both release films from the pressure-sensitive adhesive sheet was adhered using a MOCON PERMATRAN (MODULE INFORMATION: Permatran-W 3/33 Model) for 24 days at 25 ° C and a relative humidity of 100% The moisture permeability of the film was measured.

Claims (12)

An adhesive film having a surface energy of 26.6 mN / m or more at 25 占 폚. The pressure-sensitive adhesive film according to claim 1, wherein the pressure-sensitive adhesive film has a water permeability of less than 400 g / m ² · day at 25 ° C. and a relative humidity of 100%. The pressure-sensitive adhesive film according to claim 1, wherein the pressure-sensitive adhesive film is formed from a pressure-sensitive adhesive composition comprising a (meth) acrylic copolymer of a monomer mixture containing more than 10% by weight of a polar (meth) acrylic monomer. 4. The pressure-sensitive adhesive film according to claim 3, wherein the polar (meth) acrylic monomer comprises at least one of a (meth) acrylic monomer having a hydroxyl group and a (meth) acrylic monomer having a carboxylic acid group. The composition according to claim 3, wherein the (meth) acrylic copolymer is a copolymer of a monomer mixture comprising 65 to 85% by weight of a (meth) acrylic monomer having an alkyl group and 15 to 35% by weight of a (meth) acrylic monomer having a hydroxyl group, Adhesive film. The thermoplastic resin composition according to claim 3, wherein the (meth) acrylic copolymer comprises 60 to 85% by weight of a (meth) acrylic monomer having an alkyl group, 11 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group, 1 to 10% by weight of an acrylic monomer. The composition according to claim 3, wherein the (meth) acrylic copolymer comprises 60 to 85% by weight of a (meth) acrylic monomer having an alkyl group, 10 to 25% by weight of a (meth) acrylic monomer having a hydroxyl group, 0.5 to 10% by weight of a monomer mixture. The composition according to claim 3, wherein the (meth) acrylic copolymer comprises 50 to 75% by weight of a (meth) acrylic monomer having an alkyl group, 11 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group, Wherein the copolymer is a copolymer of a monomer mixture comprising 10 to 25% by weight of a monomer. The composition according to claim 3, wherein the (meth) acrylic copolymer comprises 50 to 75% by weight of a (meth) acrylic monomer having an alkyl group, 11 to 30% by weight of a (meth) acrylic monomer having a hydroxyl group, Wherein the copolymer is a copolymer of a monomer mixture comprising 10 to 25% by weight of a monomer and 1 to 10% by weight of a (meth) acrylic monomer having a heteroalicyclic group. The adhesive film according to claim 3, wherein the pressure-sensitive adhesive composition further comprises a crosslinking agent and a photopolymerization initiator. The adhesive film according to claim 3, wherein the pressure-sensitive adhesive composition further comprises a silane coupling agent. An optical display device comprising the adhesive film of claim 1.

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