TW201615790A - Adhesive composition, optically clear adhesive film and touch screen panel - Google Patents

Abstract

Provided is an adhesive composition comprising a (meth)acrylic acid ester-based monomer and a light-curing acrylic-based polymer resin of a low dielectric monomer, wherein the low dielectric monomer comprises a hydroxyl group-containing monomer and an N-containing monomer, and the hydroxyl group-containing monomer is 5-15 wt% of the total monomers contained in the light-curing acrylic-based polymer resin.

Description

Binder composition, optical adhesive film and touch screen panel

The invention provides an adhesive composition, an optical transparent adhesive film and a touch screen panel.

Recently, electronic devices such as PDAs, mobile communication terminals, or navigators for vehicles have formed a large market. In the electronic device, the technical goals to be pursued are mainly thinning, light weight, low power consumption, high resolution, and high brightness.

On the other hand, an electronic device in which an input operation unit is provided with a touch screen or a touch panel switch uses a transparent conductive plastic film for weight reduction and crack prevention. As an example, there is a film in which a polyethylene terephthalate (PET) film is used as a substrate and a conductive layer such as indium tin oxide (ITO) is formed on one surface, and the film is adhered. The layer of the layer is laminated on a conductive glass, a reinforcing material, a decorative film, or the like.

The above adhesive layer requires various physical properties such as touch sensitivity and durability.

An embodiment of the present invention provides an adhesive composition which is excellent in sensitivity to touch and which can suppress the problem of turbidity.

Still another embodiment of the present invention provides light prepared from the above binder composition Learn to use adhesive film.

Another embodiment of the present invention provides a touch panel for an optical adhesive film prepared from the above-described adhesive composition for a touch panel.

An embodiment of the present invention provides a binder composition comprising a (meth)acrylic acid ester monomer and a photo-curable acrylic acid having a low dielectric constant monomer. a copolymer-like resin, the low dielectric constant monomer comprising a hydroxyl group-containing monomer and an N-containing monomer, wherein the hydroxyl group-containing monomer is a total monomer constituting the photocurable acrylic copolymer resin 5 to 15 weight percent.

In the total monomer constituting the above photocurable acrylic copolymer resin, the above N-containing monomer may be 0.1 to 10% by weight.

The above binder composition may have a hydroxyl value of from 25 to 70 mgKOH/g.

The above hydroxyl group-containing monomer may comprise a solvent selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4 4-hydroxybutyl(meth)acrylate, 6-hydroxyhexyl(meth)acrylate, hydroxyoctyl 8-(meth)acrylate 8-hydroxyoctyl(meth)acrylate), 2-hydroxyethylene glycol (meth)acrylate, 2-hydroxypropylene glycol (meth)acrylate At least one of a group consisting of acrylates and combinations thereof.

The above N-containing monomer may be a compound containing a double bond and an N-containing functional group.

The above N-containing functional group may be a primary amine group, a secondary amine group, an imine group, or an amino group. Or a pyridine group.

The above N-containing monomer may be selected from the group consisting of (meth)acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, and the like. One of the combined groups.

The photocurable acrylic copolymer resin may be a linear or branched C1-C14 alkyl acrylate, a C6-C20 alicyclic condensed ring or a fused ring acrylate, a hydroxyl group-containing monomer, and the like. N monomer tetrapolymer.

The above linear or branched C1-C14 alkyl acrylate may be selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, and propyl methacrylate ( N-propyl(meth)acrylate), isopropyl (meth)acrylate, n-butyl(meth)acrylate, t-butyl methacrylate (t-butyl() Meth)acrylate), sec-butyl(meth)acrylate, pentyl(meth)acrylate,2-ethylhexyl(meth) Acrylate), 2-ethylbutyl (meth)acrylate, n-octyl(meth)acrylate, isooctyl(meth)acrylate One of the group consisting of isononyl (meth)acrylate and combinations thereof.

The acrylate comprising the above C6-C20 alicyclic condensed ring or fused ring may comprise selected from isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like. One of the combined groups.

The photocurable acrylic copolymer resin may be contained in an amount of 30 to 60% by weight of a linear or branched C1-C14 alkyl acrylate, and 30 to 50% by weight. A copolymer of a C6-C20 alicyclic condensed ring or a fused ring acrylate, 5 to 20 weight percent of a hydroxyl group-containing monomer, and 1 to 10 weight percent of a monomer of a N-containing tetrapolymer.

The invention may also comprise a photoinitiator.

The photoinitiator may comprise a group selected from the group consisting of a benzoin-based initiator, a hydroxyketone-based initiator, an aminoketone-based initiator, caprolactam, and combinations thereof. One of the groups.

According to still another embodiment of the present invention, there is provided an adhesive film for optics, wherein the optical adhesive film comprises an adhesive layer, and the adhesive layer comprises a photocured material of the adhesive composition.

The above-mentioned optical adhesive film measured at a frequency of 100 kHz may have a dielectric constant k value of 3.0 or less.

Another embodiment of the present invention provides a touch screen panel, the touch screen panel includes: a conductive plastic film layer, a conductive layer is formed on one surface of the conductive plastic film layer; and a transparent bonding layer is disposed on the conductive layer The optical adhesive film is laminated on the upper portion of the layer, and the cover layer is laminated on the upper portion of the optical adhesive film.

The conductive plastic film layer may be a polyethylene terephthalate film having a conductive metal oxide layer formed on one surface thereof.

The cover window may be a plastic film or tempered glass instead of transparent glass.

When applied to a touch panel, the optical adhesive film prepared from the above binder composition improves touch sensitivity and suppresses white turbidity.

100‧‧‧Touch screen panel

110‧‧‧Transparent bonding layer

131‧‧‧Plastic substrate layer

132‧‧‧ Conductive layer

130‧‧‧Conductive plastic film

150‧‧‧covering window

160‧‧‧Transparent substrate

170‧‧‧Liquid Crystal Display Unit (LCD)

FIG. 1 is a schematic cross-sectional view of a touch screen panel according to an embodiment of the invention.

Hereinafter, embodiments of the present invention will be described in detail. However, this is merely an exemplification, and the present invention is not limited thereto, and the present invention is defined only in accordance with the scope of the patent application described later.

The present invention provides an adhesive composition for a touch screen panel, wherein the adhesive composition for a touch screen panel comprises a (meth) acrylate monomer and a photocurable acrylic having a low dielectric constant monomer. a copolymerization resin, wherein the low dielectric constant monomer comprises a hydroxyl group-containing monomer and an N-containing monomer, and the hydroxyl group-containing monomer is 5 to 15% by weight in the total monomer constituting the photocurable acrylic copolymer resin. .

When a touch screen panel of a display device such as a mobile device or a tablet computer is produced, a conductive plastic film layer and a cover window for forming a conductive layer on one side are prepared from the adhesive composition for the touch screen panel. The optical adhesive film used as a bonding medium to which the layers are bonded.

The adhesive composition for a touch screen panel is photocured to form an optical adhesive film, and the optical adhesive film is optically formed in a transparent manner, thereby being suitable for touch. Screen panel and, with a low dielectric constant. As such, the optical adhesive film having a low dielectric constant increases sensitivity to touch, and is thus usefully applicable to a touch panel. Further, the above-mentioned optical adhesive film can suppress the occurrence of white turbidity and achieve a low dielectric constant.

Since the monomer constituting the photocurable acrylic copolymer resin contains the above low dielectric constant monomer, a low dielectric constant can be achieved. For example, the optical adhesive film prepared from the above binder composition measured at a frequency of about 100 kHz may have a dielectric constant k value of 3.0 or less.

Moreover, the low dielectric constant monomer comprises a hydroxyl group-containing monomer and an N-containing monomer, Thus, the optical adhesive film thus prepared can suppress the occurrence of white turbidity and achieve a low dielectric constant.

In one embodiment, in the total monomer constituting the photocurable acrylic copolymer resin, the N-containing monomer may be from about 0.1 to about 10% by weight.

The optical adhesive film prepared by polymerizing the photocurable acrylic copolymer resin containing the hydroxyl group-containing monomer and the N-containing monomer as the low dielectric constant monomer in a content ratio in the above range can suppress white clouding and A low dielectric ratio can be achieved.

When a hydroxyl group-containing monomer is used alone, although a low dielectric constant ratio can be achieved, white turbidity can occur at the same time. Therefore, the photocurable acrylic copolymer resin is used together with the above-mentioned N-containing monomer, and The total low dielectric constant monomer is used in an appropriate amount, whereby the low dielectric constant ratio can be achieved, and the content of the above hydroxyl group-containing monomer can be reduced, thereby suppressing the occurrence of white turbidity.

For example, the above binder composition may have a hydroxyl value of from about 25 to about 70 mgKOH/g.

In a specific embodiment, the hydroxyl group-containing monomer may be hydroxyethyl 2-(meth)acrylate, hydroxypropyl 2-(meth)acrylate, hydroxybutyl 4-(meth)acrylate, 6-(methyl Hydroxyhexyl acrylate, hydroxyoctyl 8-(meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate, 2-hydroxy propylene glycol (meth) acrylate, etc., and combinations thereof may be included .

The N-containing monomer is a compound containing a double bond and an N-containing functional group, and can be polymerized by a double bond, and a low dielectric constant ratio is achieved by the N-containing functional group. Thus, the structure includes a double bond and an N-containing functional group. The compound can be used without limitation.

Specifically, for example, the above N-containing functional group may be a primary amino group, a secondary amino group, an imido group, an amino group, a pyridyl group or the like.

Specifically, for example, the above N-containing monomer may include (meth) acrylamide, N-vinyl pyrrolidone, N-vinyl caprolactam, and the like, and may include a combination thereof.

In one embodiment, a linear or branched C1-C14 alkyl acrylate and a C6-C20 alicyclic condensed ring or a fused ring-containing acrylate may be used as the above (meth) acrylate monomer, and A photocurable acrylic copolymer resin is prepared by copolymerizing the above hydroxyl group-containing monomer and the N-containing monomer. That is, the photocurable acrylic copolymer resin may be a linear or branched C1-C14 alkyl acrylate, a C6-C20 alicyclic condensed ring or an acrylate containing a fused ring, a hydroxyl group-containing monomer, and a N-containing single Bulk tetrapolymer.

The type and content of the linear or branched C1-C14 alkyl acrylate are adjusted so that the above-mentioned binder composition photocured product can have appropriate cohesive force, glass transition temperature and adhesive properties.

Specifically, the above linear or branched C1-C14 alkyl acrylate may comprise methyl (meth) acrylate, ethyl (meth) acrylate, propyl methacrylate. (n-propyl(meth)acrylate), isopropyl (meth)acrylate, n-butyl(meth)acrylate, t-butyl methacrylate (meth)acrylate), sec-butyl(meth)acrylate, pentyl(meth)acrylate, 2-ethylhexyl methacrylate Acrylate), 2-ethylbutyl(meth)acrylate, n-octyl(meth)acrylate, isooctyl(meth)acrylate ), isonyl (meth)acrylate, and the like, and may include a combination thereof.

Acrylate containing the above C6-C20 alicyclic condensed ring or fused ring The structure of the C6-C20 alicyclic condensed ring or the condensed ring makes the photocurable acrylic copolymer resin easy to form a physically entangled structure, thereby improving the cohesive force of the binder composition and forming an adhesive film. When it is suppressed, bubbles are generated.

Specifically, the acrylate containing the above C6-C20 alicyclic condensed ring or fused ring may contain isobornyl methacrylate, cyclohexyl methacrylate or the like, and may contain a combination thereof.

In still another embodiment, the photocurable acrylic copolymer resin may be 30 to 60% by weight of a linear or branched C1-C14 alkyl acrylate, and 30 to 50% by weight of a C6-C20 alicyclic ring. A copolymer of a family condensed ring or a fused ring acrylate, 5 to 20 weight percent of a hydroxyl group-containing monomer, and 1 to 10 weight percent of a monomer of a N-containing tetrapolymer.

In order to adjust the degree of polymerization using the photocurable composition, the above binder composition may further contain a photoinitiator. The photoinitiator may be used in an amount of from about 0.01 to about 10 parts by weight based on 100 parts by weight of the photocurable acrylic copolymer resin, as long as radicals can be generated by light irradiation and polymerization is initiated, and the photoinitiation is initiated. The kind of the agent is not particularly limited, and for example, the above binder composition may comprise a group selected from the group consisting of a benzoin initiator, a hydroxyketone initiator, an aminoketone initiator, caprolactam, and combinations thereof. One.

Further, the binder composition may further include an epoxy resin, a crosslinking agent, a UV stabilizer, an antioxidant, a toner, a reinforcing agent, a filler, and an antifoaming agent, within a range not affecting the effects of the present invention. One or more additives in the group consisting of surfactants, plasticizers, and combinations thereof.

In another embodiment of the present invention, there is provided an adhesive film for optics, the optical adhesive film comprising an adhesive layer, wherein the adhesive layer comprises the adhesive layer for the touch screen panel A photocured product of the compound.

The above-mentioned optical adhesive film measured at a frequency of 100 kHz may have a dielectric constant k value of about 3.0 or less. As described above, the above-mentioned optical adhesive film has a low dielectric constant, so that sensitivity can be improved when applied to a touch panel, and white turbidity can be remarkably improved, which is in the above binder composition. The description is the same.

After the above binder composition is applied onto a substrate layer, it is photocured by light irradiation to prepare an adhesive film. "Light irradiation" refers to irradiation of electromagnetic waves that can affect the photoinitiator or the polymerizable compound to initiate polymerization. In the above, electromagnetic waves are used to mean not only microwaves, infrared rays, ultraviolet rays, X-rays, and gamma rays. Further, it means a particle beam such as an α-particle beam, a proton beam, a neutron beam, and an electron beam.

The method of preparing the above adhesive film by photocuring the above binder composition is not particularly limited. For example, a coating liquid prepared by applying the above-described binder composition or a solvent to the binder composition in a suitable step substrate can be carried out by using a known apparatus such as a bar coater. A method of curing to prepare the above adhesive film.

After sufficiently removing the bubble-initiating component such as the volatile component or the reaction residue contained in the binder composition or the coating liquid, the above-described curing step is performed to appropriately impart the crosslinking density or molecular weight and modulus of elasticity of the cured product. Wait. In the high temperature state, the bubble existing in the bonding interface becomes large, so that the problem of forming a disordered body inside can be prevented.

Further, the method of curing the above binder composition or the coating liquid thereof is not particularly limited, and for example, the coating layer formed by the above-mentioned touch panel adhesive composition or the coating liquid thereof may be irradiated with ultraviolet rays. Or perform an aging process under specified conditions to perform Curing process.

For example, the above photocuring can be performed by ultraviolet irradiation.

The ultraviolet (UV) irradiation performed to perform the above photocuring can be performed by irradiation with a metal halide lamp which is generally used for about 10 seconds to about 15 seconds.

The amount of light irradiated with the above ultraviolet rays is preferably from about 0.5 J/cm ² to about 2.0 J/cm ² , more preferably from about 1.0 J/cm ² to about 1.5 J/cm ² .

The above optical adhesive film may have a thickness of from about 50 μm to about 300 μm, specifically from about 100 μm to about 200 μm. When the thickness of the above-mentioned adhesive film is in the above range, it can be applied to a thin touch panel or a touch panel, and an adhesive film excellent in durability can be obtained.

In another embodiment of the present invention, a touch screen panel is provided, the touch screen panel includes: a conductive plastic film layer, a conductive layer is formed on one side of the conductive plastic film layer; and a transparent adhesive layer The optical adhesive film is laminated on the upper portion of the conductive layer, and the cover layer is laminated on the upper portion of the optical adhesive film.

The cover window layer can be used as a plastic film instead of transparent glass which can be developed as a substitute for tempered glass or tempered glass. In the case where the above glass replaces the plastic film, a plurality of functions can be imparted to each layer as a multilayer structure.

FIG. 1 is a schematic cross-sectional view of the above touch screen panel 100.

In the first embodiment, the touch screen panel 100 may include: a cover window layer 150; a transparent adhesive layer 110; a conductive plastic film layer 130, and a conductive layer 132 formed on one surface of the plastic substrate layer 131; Transparent substrate 160. Further, the touch panel 100 including the layers described above may be attached to a display device such as a liquid crystal display (LCD) 170.

The transparent adhesive layer 110 is a layer which is photocured by the above binder composition, and the optical adhesive film is described in detail as described above.

The specific kind of the conductive plastic film layer 130 is not particularly limited, and a conductive film known in the art can be used. For example, the conductive plastic film layer 130 may be a transparent plastic film in which a transparent indium tin oxide electrode layer is formed as a conductive layer 132 on one surface. Specifically, the transparent plastic film forming the plastic substrate layer 131 may be a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, or a polypropylene film. , polybutene film, polybutadiene film, vinyl chloride copolyme film, polyurethane film, ethylene vinyl acetate film, ethylene-propylene ( Ethylene-propylene copolymer film, ethylene-ethyl acrylate copolymer film, ethylene-methyl acrylate copolymer film or polyimide film, etc. Not limited to this. More specifically, the plastic substrate layer 131 may be a polyethylene terephthalate film.

Hereinafter, examples and comparative examples of the present invention will be described. However, the following examples are merely examples of the invention, and the invention is not limited to the following examples.

Example 1

88 parts by weight of ethylhexyl acrylate, 10 parts by weight of hydroxypropyl acrylate, and 2 parts by weight of N-vinylpyrrolidone were placed in a 1 liter glass reactor and thermally polymerized. A photocurable acrylic copolymer resin syrup having a viscosity of 35 cP was obtained. The calculated hydroxyl value of the photocurable acrylic copolymer resin syrup was 41 mgKOH/g. 100 parts by weight of the obtained photocurable propylene An acid copolymerized resin (based on a solid content), and 0.5 parts by weight of a, a-methoxy-a-hydroxyacetophenone (a, agoxy 651, Igacure 651, Ciba (Ciba) as a photoinitiator, and mixing 0.35 parts by weight of 1,6-hexanediol diacrylate (HDDA, 1,6-Hexanediol diacrylate) as a crosslinking agent, and then fully stirring it. A binder composition is prepared. Next, the above-mentioned binder composition was formed into a film at a thickness of 100 μm, and photocured, and an adhesive film for optics was prepared using a cured film.

Example 2

The same method as in Example 1 except that 85 parts by weight of ethylhexyl acrylate, 10 parts by weight of hydroxypropyl acrylate, and 5 parts by weight of N-vinylpyrrolidone were used to prepare a photocurable acrylic copolymer resin. An adhesive film for optics was prepared. The photocurable acrylic copolymer resin prepared above had a hydroxyl value of 41 mgKOH/g.

Example 3

78 parts by weight of ethylhexyl acrylate, 10 parts by weight of hydroxypropyl acrylate, 10 parts by weight of hydroxypropyl acrylate and 2 parts by weight of N-vinylpyrrolidone were placed in a 1 liter glass reactor, and passed through heat. Polymerization was carried out to obtain a photocurable acrylic copolymer resin syrup having a viscosity of 35 cP. The calculated hydroxyl value of the photocurable acrylic copolymer resin syrup was 41 mgKOH/g. 0.5 parts by weight of a, a-methoxy-a-hydroxyacetophenone (Yanjiagu 651, Seba) was mixed with 100 parts by weight of the obtained photocurable acrylic copolymer resin (based on solid content). As a photoinitiator, 0.35 parts by weight of 1,6-hexanediol diacrylate was mixed as a crosslinking agent, and then sufficiently stirred to prepare a binder composition. Next, the above-mentioned binder composition was formed into a film at a thickness of 100 μm, and photocured, and an adhesive film for optics was prepared using a cured film.

Example 4

78 parts by weight of ethylhexyl acrylate, 10 parts by weight of cyclohexyl (meth)acrylate, 10 parts by weight of hydroxypropyl acrylate and 2 parts by weight in a 1 liter glass reactor N-vinylpyrrolidone was obtained by thermal polymerization to obtain a photocurable acrylic copolymer resin syrup having a viscosity of 35 cP. The calculated hydroxyl value of the photocurable acrylic copolymer resin syrup was 41 mgKOH/g. 0.5 parts by weight of a, a-methoxy-a-hydroxyacetophenone (Yanjiagu 651, Seba) was mixed with 100 parts by weight of the obtained photocurable acrylic copolymer resin (based on solid content). As a photoinitiator, 0.35 parts by weight of 1,6-hexanediol diacrylate was mixed as a crosslinking agent, and then sufficiently stirred to prepare a binder composition. Next, the above-mentioned binder composition was formed into a film at a thickness of 100 μm, and photocured, and an adhesive film for optics was prepared using a cured film.

Comparative example 1

An optical adhesive film was prepared in the same manner as in Example 1 except that 90 parts by weight of ethylhexyl acrylate and 10 parts by weight of hydroxypropyl acrylate were used to prepare a photocurable acrylic copolymer resin. The photocurable acrylic copolymer resin prepared above had a hydroxyl value of 41 mgKOH/g.

Comparative example 2

An optical adhesive film was prepared in the same manner as in Example 1 except that 85 parts by weight of ethylhexyl acrylate and 15 parts by weight of hydroxypropyl acrylate were used to prepare a photocurable acrylic copolymer resin. The photocurable acrylic copolymer resin prepared above had a hydroxyl value of 62 mgKOH/g.

Evaluation

Experimental Example 1: Evaluation of Dielectric Rate

The optical adhesive films prepared in the above Examples 1 to 4 and Comparative Examples 1 to 2 were brought into contact with the electrodes on both surfaces of the electrode under the following conditions and the following conditions, and the dielectric constant k value was measured and described in Table 1 below. in.

Equipment: Agilent Technologies E4980A LCR meter

Test Frequencies: 20Hz~2MHz

Electrode diameter: 5mm

Experimental Example 2: Evaluation of white turbidity

The glass/adhesive film/glass laminate structure was prepared using the optical adhesive films prepared in the above Examples 1 to 4 and Comparative Examples 1 to 2, and then subjected to a constant temperature and humidity machine (85 ° C / 85% RH). After standing for 3 days, it was confirmed with the naked eye whether or not it was turbid, and the evaluation results are shown in Table 1 below.

As shown in the above Table 1, it was confirmed that Examples 1 to 4 did not cause white turbidity as compared with the adhesive films of Comparative Examples 1 to 2, and exhibited a low dielectric constant ratio of 3.0 or less.

Hereinabove, a plurality of preferred embodiments of the present invention have been described in detail, but the present invention The scope of the invention is not limited thereto, and various modifications and improvements made by those skilled in the art to which the present invention pertains to the basic concept of the invention defined in the scope of the invention are also claimed. .

100‧‧‧Touch screen panel

110‧‧‧Transparent bonding layer

131‧‧‧Plastic substrate layer

132‧‧‧ Conductive layer

130‧‧‧Conductive plastic film

150‧‧‧covering window

160‧‧‧Transparent substrate

170‧‧‧Liquid Crystal Display Unit (LCD)

Claims (18)

A binder composition comprising a (meth)acrylic acid ester monomer and a photo-curable acrylic copolymer resin having a low dielectric constant monomer, and the low dielectric constant monomer The hydroxyl group-containing monomer and the N-containing monomer are contained in the total monomer constituting the photocurable acrylic copolymer resin, and the hydroxyl group-containing monomer is 5 to 15% by weight. The binder composition according to claim 1, wherein the N-containing monomer is 0.1 to 10% by weight in the total monomer constituting the photocurable acrylic copolymer resin. The binder composition according to the above aspect of the invention, wherein the binder composition has a hydroxyl value of from 25 to 70 mgKOH/g. The binder composition according to claim 1, wherein the hydroxyl group-containing monomer comprises a group selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-(A) 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl(meth)acrylate, 6-hydroxyhexyl 6-hydroxyhexyl (meth)acrylate), 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethylene glycol (meth)acrylate, At least one of the group consisting of 2-hydroxypropylene glycol (meth) acrylate and combinations thereof. The binder composition according to claim 1, wherein the N-containing monomer is a compound containing a double bond and a functional group containing N. The binder composition according to claim 5, wherein the N-containing functional group is a primary amine group, a secondary amine group, an imine group, or an amino group. (amino group) or pyridine group. The binder composition according to claim 1, wherein the N-containing monomer is selected from the group consisting of (meth)acrylamide and N-vinylpyrrolidone. And one of the group consisting of N-vinylcaprolactam and combinations thereof. The binder composition according to claim 1, wherein the photocurable acrylic copolymer resin is a linear or branched C1-C14 alkyl acrylate containing C6-C20 fat. A cyclized ring or a fused ring acrylate, a hydroxyl group-containing monomer, and a quaternary copolymer containing an N monomer. The binder composition according to claim 8, wherein the linear or branched C1-C14 alkyl acrylate is selected from the group consisting of methyl (meth)acrylate, methyl Ethyl acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl methacrylate (meth)acrylate), t-butyl(meth)acrylate, sec-butyl(meth)acrylate,pentyl(meth)acrylate , 2-ethylhexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, butyl methacrylate (n-octyl (meth) One of a group consisting of acrylate), isooctyl (meth)acrylate, isonyl (meth)acrylate, and combinations thereof. The binder composition according to claim 8, wherein the acrylate comprising the above C6-C20 alicyclic condensed ring or fused ring comprises an isobomyl (meth) acrylate selected from the group consisting of isobutyl methacrylate (meth) One of the group consisting of cyclohexyl (meth) acrylate and combinations thereof. The binder composition according to claim 1, wherein the photocurable acrylic copolymer resin comprises 30 to 60% by weight of a linear or branched C1-C14 alkyl acrylate, 30 to 30 50% by weight of a monomer comprising a C6-C20 alicyclic condensed ring or a fused ring acrylate, 5 to 20% by weight of a hydroxyl group-containing monomer, and 1 to 10% by weight of a N-containing monomer-containing quaternary copolymer Copolymer. The binder composition according to the above aspect of the invention, wherein the binder composition further comprises a photoinitiator. The binder composition according to claim 12, wherein the photoinitiator comprises a benzoin-based initiator, a hydroxyketone-based initiator, and an aminoketone. One of a group consisting of an initiator, caprolactam, and combinations thereof. An optical adhesive film comprising an adhesive layer comprising the photocured material of the adhesive composition according to any one of claims 1 to 13. The optical adhesive film according to claim 14, wherein the dielectric constant k measured at a frequency of 100 kHz is 3.0 or less. A touch screen panel comprising: a conductive plastic film layer having a conductive layer formed on one surface of the conductive plastic film layer; and a transparent adhesive layer laminated on an upper portion of the conductive layer as claimed in claim 14 Narration The optical adhesive film is formed; and the cover layer is laminated on the upper portion of the optical adhesive film. The touch screen panel of claim 16, wherein the conductive plastic film layer is a polyethylene terephthalate film having a conductive metal oxide layer formed on one surface thereof. . The touch screen panel of claim 16, wherein the cover window layer is a plastic film or tempered glass instead of transparent glass.