KR20170102099A - Transparent bonding film and touch screen panel - Google Patents

Abstract

The present invention provides a transparent adhesive film which includes a bonding layer and an adhering layer, wherein the bonding layer includes an acrylic thermosetting resin and a photocurable compound and is a semi-hardened film which can be additionally cured by light. The adhering layer is a cured film formed by thermosetting or photocuring.

Description

TRANSPARENT BONDING FILM AND TOUCH SCREEN PANEL,

A transparent point adhesive film and a touch screen panel.

2. Description of the Related Art In recent years, electronic devices such as a PDA, a mobile communication terminal, or a navigation system for a vehicle have formed a large market. In such electronic devices, the technical goals pursued are mainly thinning, lightening, low power consumption, high resolution and high brightness.

On the other hand, a transparent conductive plastic film is used as an electronic device having a touch screen or a touch panel switch on the input operation section for light weight and prevention of breakage. An example of such a film is a film made of a polyethylene terephthalate (PET) film as a substrate and a conductive layer such as indium tin oxide (ITO) formed on one surface thereof. The film has a conductive Glass, a reinforcing material or a deco film.

The pressure-sensitive adhesive layer is required to have various properties such as durability.

An embodiment of the present invention provides a transparent point-adhesive film having excellent reliability in a high-temperature and high-humidity environment and having excellent durability.

Another embodiment of the present invention provides a touch screen panel to which the transparent point adhesive film is applied.

In one embodiment of the present invention, the adhesive layer comprises an acrylic thermosetting resin and a photo-curable photo-curable compound, wherein the adhesive layer is an additional photo-curable semi-curable film, A transparent point adhesive film which is a cured film formed by curing or photo-curing.

In another embodiment of the present invention, a conductive plastic film layer having a conductive layer on one side thereof; A transparent spot adhesive layer formed by further photo-curing the transparent spot adhesive film laminated on the conductive layer; And a cover window layer laminated on the transparent adhesive layer.

The transparent pressure-sensitive adhesive film or the pressure-sensitive adhesive film has excellent reliability and excellent durability in a high-temperature and high-humidity environment.

1 is a schematic cross-sectional view of a transparent point adhesive film according to an embodiment of the present invention.
2 is a schematic cross-sectional view of a touch screen panel according to another embodiment of the present invention.
3 is a schematic cross-sectional view of a touch screen panel according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In one embodiment of the present invention, there is provided a transparent point-adhesive film comprising an adhesive layer and an adhesive layer. Wherein the adhesive layer is an additional photocurable semi-curable film comprising an acrylic thermosetting resin and a photo-curable photo-curable compound, wherein the adhesive layer is a cured film formed by thermal curing or photo-curing.

FIG. 1 is a schematic cross-sectional view of a transparent point adhesive film 100 according to an embodiment of the present invention, in which an adhesive layer 111 and an adhesive layer 112 are laminated.

The transparent point adhesive film 100 may be used as a medium for attaching the conductive plastic film layer and the cover window layer having the conductive layer formed on one side thereof to the touch screen panel of a display device such as a mobile, tablet PC or the like.

The transparent point adhesive film 100 is easy to handle during the process and is excellent in durability, so that it is useful for applying the conductive plastic film layer and the cover window layer of the above-mentioned touch screen panel.

The adhesive layer 112 can be manufactured by thermally curing a composition for forming an adhesive layer containing an acrylic thermosetting resin and a photo-curable photocurable compound.

The adhesive layer 112 is a semi-cured film that can be further cured by photo-curing since it contains the photo-curable compound.

The adhesive layer 112 mainly has an adhesive property as a semi-cured film, and then, when it is photo-cured and hardened further, adhesive property is given.

The acrylic thermosetting resin can be used without limitation as the acrylic thermosetting resin which can be used for a known adhesive application.

The acrylic thermosetting resin may have a weight average molecular weight of about 400,000 g / mol to about 1,000,000 g / mol, specifically about 500,000 g / mol to about 1,000,000 g / mol.

The acrylic thermosetting resin may be, for example, a polymer of an acrylic monomer such as a (meth) acrylic acid ester monomer.

The (meth) acrylic acid ester monomer may be, for example, alkyl (meth) acrylate, but is not limited thereto. The alkyl of the alkyl (meth) acrylate may be linear or branched C1-C14 alkyl, specifically C1-C8 alkyl. The alkyl (meth) acrylate having the carbon number within the above range can be used to control the curable resin composition to have appropriate adhesive properties.

Specific examples of the (meth) acrylate monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (Meth) acrylate, 2-ethylbutyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (Meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) acrylate, isononyl (meth) acrylate, and combinations thereof. Also, it may include at least one of a combination of 2-hydroxyethyl (meth) acrylate, acrylic acid, 2-hydroxypropyl (meth) acrylate and 4-butyl acrylate because it contains a carboxyl group and a hydroxyl group.

In one embodiment, the monomer of the acrylic thermosetting resin may comprise a hydroxyl group or a carboxyl group.

Among the examples of the monomer of the acrylic thermosetting resin, in the case of an acrylic system containing a hydroxyl group or a carboxyl group, it is preferable that the acrylic thermosetting resin is chemically And the solubility parameter of the acrylic thermosetting resin to the photo-curing compound can be controlled, thereby contributing to the stability.

Therefore, it is possible to improve the compatibility with the photo-curable compound by controlling the content of the hydroxyl group or carboxyl group introduced into the acrylic thermosetting resin, and by controlling the degree of polarity, the curable resin composition for optical adhesive film is made into a transparent uniform .

As described above, by making the curable resin composition for optical adhesive films to have a transparent uniform phase, an optical adhesive film having excellent transparency can be produced.

The photocurable compound generally refers to a photocurable monomer, oligomer or prepolymer that can be photocured, and may include a photocurable monomer, an oligomer, a prepolymer, or at least one of them.

Specifically, the photocurable compound may have a degree of polymerization of from about 10% to about 45% conversion. Specifically, the photocurable compound may be an oligomer or prepolymer having a weight average molecular weight of about 5,000 g / mol to about 8,000 g / mol.

The adhesive layer 112 may additionally be photo-cured because it contains the photo-curable compound. In other words, the adhesive layer 112 may be photocured to completely or almost completely cure the adhesive layer 112.

The adhesive layer 112 has adhesiveness in the form of a semi-cured film, and thereafter further photo-curing proceeds to impart adhesive performance.

Wherein the photocurable compound comprises a first photocurable monomer comprising a thiol group or an acrylic group; A second photo-curable monomer which is an isocyanurate compound comprising at least one member selected from the group consisting of epoxy, allyl, acrylate, urethane acrylate, and combinations thereof; Or at least one monomer selected from the group consisting of the first photo-curable monomer, the second photo-curable monomer and combinations thereof, an oligomer thereof, or a prepolymer thereof.

Specific examples of the first photocurable monomer include pentaerythritol tetra (3-mercapto-propionate), PEMP, and pentaerythritol tetra (3-mercapto-propionate) Butyrate) (Pentaerythritol Tetra (3-mercapto-butylate), PE-01), and combinations thereof.

Specific examples of the second photocurable monomer include tris (2-hydroxyalkyl) isocyanurate triepoxy, triallyl isocyanurate, tris (2-hydroxyalkyl) isocyanurate triacrylate, At least one member selected from the group consisting of isophorone diisocyanurate, alkyl diisocyanurate, alicyclic diisocyanurate compound, alkyl diisocyanurate trimer, 2-hydroxyalkyl acrylate, and combinations thereof . Among the compounds, alkyl may be linear or branched C1-C14 alkyl, specifically C1-C8 alkyl.

The second photo-curable monomer is specifically a tris (2-hydroxyethyl) isocyanurate triepoxide of the following formula 1, triallyl isocyanurate of the following formula 2, tris (2-hydroxyethyl ) Isocyanurate triacrylate isocyanurate, or combinations thereof.

 [Chemical Formula 1]

(2)

(3)

The isocyanurate compound containing urethane acrylate in the second photocurable monomer may be a compound having an isocyanate structure capable of forming at least two or more urethane bonds, and may be a compound having an isocyanate structure, such as Evonik and Bayer's aliphatic diisocyanate (P), TLA-100, TPA-100, and TPA-100 having a hexamethylene diisocyanate (HDI) trimer structure of an aliphatic-diisocyanate such as IPDI, HDI, H12MDI and Asahi Kasei N3300 available from Bayer Co., Ltd., or the like can be used, and they can be used in combination, but the present invention is not limited thereto.

The isocyanurate compound contained in the second photocurable monomer may be one having urethane acrylate.

Specific methods of synthesizing isocyanurate compounds containing urethane acrylate among the second photo-curable monomers are as follows.

(2-hydroxyethyl acrylate (2-HEA), 2-hydroxypropyl acrylate (2-HPA), 4-hydroxybutyl acrylate (4-HBA) Urethane acrylate was obtained by using at least one monomer of caprolactone acrylate as shown in Chemical Formula 4 below.

[Chemical Formula 4]

Specifically, the photo-curable compound is obtained by heat-treating a mixture of the first photo-curable monomer and the second photo-curable monomer at about 50 to about 80 캜 for about 120 minutes to about 150 minutes to form a semi-cured photo- Compound can be obtained.

The adhesive layer 112 may be formed by thermally curing a composition for forming an adhesive layer containing the acrylic thermosetting resin and the photocurable compound at a weight ratio of about 1: 2 to about 5: 1.

Since the adhesive layer 112 contains the acrylic thermosetting resin and the photo-curing compound at the above weight ratio, even if the adhesive layer 112 is completely cured by the subsequent photo-curing, the adhesive layer 112 is not peeled from the object to be adhered and excellent reliability in a high- And then the degree of curing can be increased by photocuring, so that the occurrence of lifting and bubbling on the adhesion surface with the object to be adhered can be minimized.

Specifically, the composition for forming an adhesive layer is prepared by including the thermosetting cured product and the photo-curable compound together with an additive such as a thermosetting agent and a photo-curing agent, followed by heat treatment, followed by drying and thermosetting, .

The heat treatment temperature can be, for example, from about 100 to about 130 캜 for about 2 minutes to about 5 minutes, and specifically about 110 캜 for about 3 minutes to about 4 minutes.

The three-dimensional crosslinking density can be further increased by the heat treatment, and the three-dimensional crosslinking density can be controlled according to the amount of the thermosetting agent. Since the adhesive layer 112 of the transparent point adhesive film 100 has a high crosslinking density due to heat treatment, it has excellent workability because of excellent cohesive strength when the film is cut or punched.

The content of the thermosetting agent is preferably about 0.01 to about 0.1 part by weight, more preferably about 0.05 to about 0.1 part by weight, based on 100 parts by weight of the solid content of the acrylic thermosetting resin.

The thermosetting agent may include at least one selected from the group consisting of an epoxy-based curing agent, an NCO-based curing agent, an aziridine-based curing agent, and a combination thereof. For example, a thermosetting agent used for obtaining the thermosetting cured product MFA-75X, MHG-80B which are hardeners, Zn chelate as a chelate curing agent, aziridine curing agent, epoxy curing agent and the like can be used.

In one embodiment, the thermosetting agent can be an NCO-based curing agent. Examples of such NCO-based curing agents include MFA-75x (hexafunctional NCO curing agent), MHG-80B (hexafunctional NCO curing agent) sold by Asahi Kasei, And so on.

By the heat treatment, the thiol group or the acrylic group of the first photocurable monomer, the oligomer thereof or the prepolymer thereof and the second photocurable monomer can form a bond.

Also, the thiol group or acrylic group of the first photocurable monomer, the oligomer thereof, or the prepolymer thereof may be bonded to the acrylic thermosetting resin by the heat treatment.

When urethane acrylate is used as the second photocurable monomer, the urethane acrylate may be bonded to the first photocurable monomer, the second photocurable monomer, oligomers thereof, or a prepolymer thereof by the heat treatment.

Specifically, the photoinitiator may be a photoinitiator that initiates a photo-curing reaction for light having an absorption wavelength of about 295 nm to about 420 nm. It is also preferred to exhibit a high water uptake at about 360 to about 380 nm, depending on the amount used.

For example, the photoinitiator may be selected from the group consisting of 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide (TPO) -based compounds, acylphosphine-based compounds, And combinations of these.

Examples of commercially available photoinitiators include Irgacure 184, Irgacure 1173, Irgacure 369, Irgacure 651, Irgacure TPO, Irgacure 2100, Irgacure 2022, and combinations thereof, which are commercially available from BASF.

Since the functional groups such as a hydroxyl group and a carboxyl group that do not form bonds and are contained in the curable resin composition for optical adhesive films are present, adhesive properties are imparted, and the adhesive layer 112 is further cured bonding.

The transparent point adhesive film 100 may include the adhesive layer 112 to realize excellent durability.

The adhesive layer 111 may be formed of an optically clear adhesive layer (OCA) so that a known composition may be used without limitation.

For example, the adhesive layer 111 may be a cured film formed by thermally curing an acrylic thermosetting resin.

Specifically, the adhesive layer 111 may be formed of a material such as 2-ethylhexyl acrylate (EHA), isobonyl acrylate (IBOA), hydroxy ethyl acrylate (HEA), etc. And a photo-initiator, a curing agent, and other additives are further added to the photo-curable compound in the monomer, oligomer, or prepolymer form in the form of a composition for forming the adhesive layer 111, The adhesive layer 111 can be formed as a cured film which is photo-cured by light irradiation or the like.

Since the transparent pressure-sensitive adhesive film 100 includes the pressure-sensitive adhesive layer 111 as a cured film, handling of the transparent pressure-sensitive adhesive film 100 during the process is facilitated and workability is improved.

In the transparent point adhesive film 100, the thickness ratio of the adhesive layer 111 and the adhesive layer 112 may be about 1: 1 to about 10: 1. The transparent point adhesive film 100 may include the adhesive layer 111 and the adhesive layer 112 so as to have a thickness ratio within the range to improve the reliability of high temperature and high humidity and minimize the occurrence of lifting and bubbling, Can be improved.

In another embodiment of the present invention, a conductive plastic film layer having a conductive layer on one side thereof; A transparent spot adhesive layer formed by further photo-curing the transparent spot adhesive film (100) laminated on the conductive layer; And a cover window layer laminated on the transparent adhesive layer.

The cover window layer may be a transparent glass alternative plastic film developed as a material that can replace tempered glass or tempered glass. In the case of the above glass replacement plastic film, various functionalities may be imparted to each layer by a multilayer structure.

2 is a schematic cross-sectional view of a touch screen panel 200 according to another embodiment of the present invention.

2, the touch screen panel 200 includes a cover window layer 250 from the top; A transparent adhesive layer 210 comprising an adhesive layer 211 and an adhesive layer 212; A conductive plastic film layer 230 having a conductive layer 232 formed on one side of the plastic substrate layer 231; And a transparent substrate 260. In addition, the touch screen panel 200 including each layer as described above may be attached to a display device such as a liquid crystal display (LCD)

The transparent point adhesive layer 210 is interposed between the conductive plastic film layer 230 and the cover window layer 250 to bond the transparent point adhesive film 100 to the conductive plastic film layer 230, And the cover window layer 250 and then cured by light.

2 shows an example in which the adhesive layer 211 and the adhesive layer 212 are positioned in the lower direction to the upper direction. However, the adhesive layer 212 and the adhesive layer 211 may be stacked in the upward direction from the lower direction.

The adhesive layer 212 is further light cured to impart adhesive performance and further improve durability. For example, the adhesive layer 212 is completely cured by photo-curing to have a gelation of 98 wt% or more, thereby increasing the degree of curing and realizing excellent durability. In addition, since the degree of hardening is high, the adhesive layer 212 can be easily detached so that the adhesive layer is not lifted, bubbles are not generated, and excellent high-temperature and high-humidity reliability can be realized.

As described above, the transparent point adhesive film layer laminated in the touch screen panel 200 has excellent durability, high temperature and high humidity reliability and adhesion, and is also suitable for optical use by securing excellent transparency.

The cover window layer 250 may further include a hard coating layer and may be attached to the transparent adhesive layer 210. When the adhesive layer 211 contains a carboxyl group-containing acrylic thermosetting resin, The cover window layer 250 can be easily detached and adhered to the cover window layer 250 so that the cover window layer 250 is not lifted and bubbles are not generated and excellent reliability of high temperature and high humidity can be realized. Specifically, when the adhesive layer 211 contains a carboxyl group-containing acrylic thermosetting resin and a photocurable compound at a weight ratio of about 1: 2 to about 5: 1, the cover window layer 250 on which the hard coating layer is not formed The above-described effect can be realized more excellently.

The photo-curing can be performed, for example, by UV irradiation.

The UV irradiation carried out for photocuring can be carried out for about 10 seconds to about 15 seconds with a metal halide lamp, which is a commonly used metal halide lamp.

The amount of the UV light is preferably about 0.5 J / cm ² to about 10 J / cm ² , and more preferably about 1.0 J / cm ² to about 5 J / cm ² .

The transparent point adhesive layer 210 is a layer formed by photo-curing the transparent adhesive film 100. The detailed description of the transparent point adhesive film 100 is as described above.

The specific kind of the conductive plastic film 230 is not particularly limited and a known conductive film in this field can be used. For example, the conductive film 230 may be a transparent plastic film having an ITO electrode layer as a conductive layer 232 on one side. Specifically, as the transparent plastic film forming the plastic substrate layer 231, a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a vinyl chloride air An ethylene-vinyl acetate film, an ethylene-propylene copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film, or a polyimide film. More specifically, the plastic substrate layer 231 may be a polyethylene terephthalate (PET) film.

3 is a schematic cross-sectional view of a touch screen panel 300 according to another embodiment of the present invention.

3, the touch screen panel 300 includes a cover window layer 350 from the top; A transparent adhesive layer 310 including an adhesive layer 312 and an adhesive layer 311; A conductive plastic film layer 330 having a conductive layer 332 formed on one surface of the plastic substrate layer 331; And a transparent substrate 360.

The transparent point adhesive layer 310 is interposed between the conductive plastic film layer 330 and the cover window layer 350 to bond the transparent point adhesive film 100 to the conductive plastic film layer 330 and the cover window layer 350 and then photo-cured. The detailed description of the transparent point adhesive film 100 is as described above.

The cover window layer 350 may further include a hard coating layer to further improve the hardness. For example, the hard coating layer may contact the transparent point-bonding layer 310.

In particular, since the adhesive layer 311 contains an acrylic thermosetting resin containing a hydroxyl group or a carboxyl group, the adhesive layer 311 can be easily detached and adhered to the hard coating layer when adhered thereto, so that the adhesive layer 311 does not generate bubbles and can realize excellent high temperature and high humidity reliability.

Hereinafter, examples and comparative examples of the present invention will be described. The following embodiments are only examples of the present invention, and the present invention is not limited to the following embodiments.

( Example )

Manufacturing example  1 Preparation of acrylic resin (A-1)

65 parts by weight of butyl acrylate (BA), 25 parts by weight of methyl methacrylate (MMA) and 10 parts by weight of hydroxyethylacrylate (HEA) 10 were charged in a 2 L reactor equipped with a cooling device for regulating the temperature of the nitrogen gas, , And ethyl acetate (EAc) was added as a solvent. Subsequently, nitrogen gas was purged for about one hour to remove oxygen, and the mixture was homogenized while maintaining the temperature at 60 DEG C, and then azobisisobutylo And 0.05 part by weight of nitrile (AIBN). Subsequently, the mixture was reacted for about 9 hours to prepare an acrylic resin (A-1) having a weight average molecular weight of about 800,000 g / mol and a solid content of 40% by weight.

Manufacturing example  2. Preparation of acrylic resin (A-2)

Except that 65 parts by weight of butyl acrylate (BA), 20 parts by weight of methyl methacrylate (MMA), 10 parts by weight of hydroxyethyl acrylate (HEA), and 5 parts by weight of acrylic acid (AA) Acrylic resin (A-2) having a weight average molecular weight of about 800,000 g / mol and a solid content of 40% by weight was prepared according to the method of Production 1.

Manufacturing example  3. Photocurable  Preparation of compound (B)

700 g of TAIC (triallyl isocyanurate) commercially available from Nippon Kasei was added to the reactor, and 10 g of aminosilane was further added thereto to maintain the temperature at 50 캜. PEMP (Pentaerylthritol Tetra 3-mercapto-propionate)) was fed at a constant rate over 1 hour. After the addition, the mixture was kept at 60 ° C for 1 hour and then heat-treated to obtain a photocurable chemical composition (B) having a weight average molecular weight of 5,000 to 8,000 g / mol capable of photocuring.

Manufacturing example  4. Preparation of partially polymerized acrylic resin (C)

55 parts by weight of ethylhexyl acrylate (EHA), 25 parts by weight of isobornyl acrylate (IBOA), and 25 parts by weight of hydroxyethyl acrylate (HEA) were added to a 2 L reactor equipped with a cooling device for nitrogen gas flow- ) Were added and partially polymerized to obtain a syrup having a weight average molecular weight of about 1,100,000 g / mol.

Example  One

The adhesive layer  Produce

0.2 parts by weight of hexanediol diacrylate as a multifunctional crosslinking agent, 0.2 parts by weight of a coupling agent (KBM 403, Shin-Etsu), 100 parts by weight of the partially polymerized acrylic resin (C) 1.5 parts by weight of urethane acrylate, and 0.3 parts by weight of a photoinitiator (Irgacure 651, manufactured by Basf) to prepare a pressure-sensitive adhesive composition. Subsequently, the prepared coating liquid was UV-cured on a release-treated polyethyleneterephthalate film (thickness: 75 mu m) and then coated with a bar coater so that the thickness became 100 mu m. Thereafter, an ultraviolet ray was irradiated for 10 minutes using a UV lamp to cure, thereby producing an adhesive film.

Production of adhesive layer

(MHG-80B, manufactured by Asahi Kasei) was added to 100 parts by weight of the acrylic resin (A-1) prepared in Preparation Example 1, 30 parts by weight of the photo-curable chemical (B) , And 0.1 part by weight of a photoinitiator (TPO, Base (trade name)) were mixed and stirred for 30 minutes while the light was blocked to obtain a curable resin composition. Then, the composition thus prepared was coated on a release-treated polyethylene terephthalate film (thickness: 75 占 퐉) to a dry rupture thickness of 25 占 퐉 and then thermally cured at 110 占 폚 for 5 minutes. The resulting adhesive layer was laminated and then stored at 40 DEG C for 3 days to prepare a pressure-sensitive adhesive film.

Example  2

The adhesive layer  Produce

A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that the thickness was 75 μm after UV curing.

Production of adhesive layer

100 parts by weight of the photo-curable chemical (B) prepared in Preparation Example 3 was added to 100 parts by weight of the acrylic resin (A-1) prepared in Preparation Example 1, followed by the addition of a polyfunctional NCO curing agent (MHG-80B, manufactured by Asahi Kasei) , And 0.3 part by weight of a photoinitiator (TPO, Base) were mixed and stirred for 30 minutes while the light was blocked to obtain a curable resin composition. Then, the composition thus prepared was coated on a release-treated polyethylene terephthalate film (thickness: 75 mu m) so as to have a dry rupture thickness of 75 mu m, followed by thermal curing at 110 DEG C for 5 minutes. The resulting adhesive layer was laminated and then stored at 40 DEG C for 3 days to produce a pressure-sensitive adhesive film

Comparative Example  One

The adhesive layer  Produce

A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that the thickness was 140 μm after UV curing.

Production of adhesive layer

A pressure-sensitive adhesive film was prepared in the same manner as in Example 1, except that the coating was coated so as to have a thickness of 10 μm after heat-drying.

Comparative Example  2

The adhesive layer  Produce

A pressure-sensitive adhesive film was prepared in the same manner as in Example 1.

Production of adhesive layer

A viscous film was prepared in the same manner as in Example 1, except that 100 parts by weight of the acrylic resin (A-2) prepared in Preparation Example 2 was used.

evaluation

Reliability evaluation

The release films were removed from the pressure-sensitive adhesive films prepared in Example 1-2 and Comparative Example 1-2, and hard coated surfaces of hard-coated polycarbonate (PC) films were attached to the adhesive surfaces of the pressure-sensitive adhesive films , And the ITO side of a polyethylene terephthalate (PET) film having an ITO layer formed on one side thereof was adhered to the pressure-sensitive adhesive side, followed by light irradiation at 3 J / cm ² using a metal halide lamp, Adhesive surface of the pressure-sensitive adhesive film / adhesive surface of the pressure-sensitive adhesive film / hard-coated surface of the PC film). In addition, a polycarbonate (PC) film not subjected to hard coating was adhered to the adhesive surface, and an ITO surface of a PET film was adhered to the adhesive surface in the same manner. Then, a metal halide lamp was applied at 3 J / cm ² (ITO surface of PET film / adhesive surface of the pressure-sensitive adhesive film / adhesive surface of the pressure-sensitive adhesive film / PC film) was prepared. Thereafter, the specimens were allowed to stand for 2 weeks under the conditions of constant temperature and humidity of 85 ° C and 85% RH, and the durability was evaluated by observing the occurrence of bubbling, lifting and / or peeling, .

<Durability Evaluation Standard>

○: No occurrence of lifting, peeling or air bubbles

△: Small amount of lifting, peeling or fine bubbles

X: There is a lot of lifting, peeling or bubbling

Psalm 1 Psalm 2 Example 1 ○ ○ Example 2 ○ ○ Comparative Example 1 △ X Comparative Example 2 ○ X

As can be seen from the above Table 1, all the transparent point adhesive films of Example 1-2 show excellent reliability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And falls within the scope of the invention.

100: transparent point adhesive film
200, 300: Touch screen panel
210 and 310: transparent point adhesive film layer
111, 211, 311: adhesive layer
112, 212, 312: adhesive layer
230, 330: Conductive plastic film
231, 331:
332, 332: conductive layer
250, 350: Cover window layer
260, 370: transparent substrate
270: Liquid crystal display (LCD)

Claims (21)

An adhesive layer and an adhesive layer,
Wherein the adhesive layer comprises an acrylic thermosetting resin and a photocurable photocurable compound,
The adhesive layer is an additional photocurable semi-cured film,
The adhesive layer may be a cured film formed by thermosetting or photo-curing
Transparent point adhesive film.
The method according to claim 1,
Wherein the adhesive layer comprises the acrylic thermosetting resin and the photocurable compound in a weight ratio of 1: 2 to 5: 1
Transparent point adhesive film.
The method according to claim 1,
Wherein the adhesive layer is a semi-cured film formed by thermosetting a composition for forming an adhesive layer containing the acrylic thermosetting resin and the photo-
Transparent point adhesive film.
The method according to claim 1,
The photocurable compound has a degree of polymerization of 10% to 45%
Transparent point adhesive film.
The method according to claim 1,
The acrylic thermosetting resin may contain a hydroxyl group or a carboxyl group
Transparent point adhesive film.
The method according to claim 1,
Wherein the acrylic thermosetting resin has a weight average molecular weight of 400,000 g / mol to 1,000,000 g / mol
Transparent point adhesive film.
The method according to claim 1,
A monomer of the photocurable compound, or an oligomer or prepolymer having a weight average molecular weight of 5,000 g / mol to 8,000 g / mol
Transparent point adhesive film.
The method according to claim 1,
Wherein the photocurable compound comprises a first photocurable monomer comprising a thiol group or an acrylic group; A second photo-curable monomer which is an isocyanurate compound comprising at least one member selected from the group consisting of epoxy, allyl, acrylate, urethane acrylate, and combinations thereof; Or at least one monomer selected from the group consisting of the first photocurable monomer, the second photocurable monomer and combinations thereof, oligomers thereof, or prepolymers thereof
Transparent point adhesive film.
9. The method of claim 8,
Wherein the first photocurable monomer comprises at least one selected from the group consisting of pentaerythritol tetra (3-mercapto-propionate), pentaerythritol tetra (3-mercapto-butylate)
Transparent point adhesive film.
9. The method of claim 8,
The second photocurable monomer may be selected from the group consisting of tris (2-hydroxyalkyl) isocyanurate triepoxy, triallyl isocyanurate, tris (2-hydroxyalkyl) isocyanurate triacrylate, isophorone diisocyanate At least one member selected from the group consisting of alkyldiisocyanurate, alicyclic diisocyanurate compound, alkyldiisocyanurate trimer, 2-hydroxyalkyl acrylate, caprolactone acrylate, and combinations thereof , Wherein alkyl is a linear or branched C1-C14 alkyl
Transparent point adhesive film.
9. The method of claim 8,
Wherein the second photocurable monomer forms a bond with the thiol group or the acrylic group of the first photocurable monomer, the oligomer thereof or the prepolymer thereof
Transparent point adhesive film.
9. The method of claim 8,
And the thiol group or acrylic group of the first photocurable monomer, the oligomer thereof or the prepolymer thereof, and the acrylic thermosetting resin form a bond
Transparent point adhesive film.
The method according to claim 1,
The adhesive layer may be a cured film formed by thermosetting an acrylic thermosetting resin
Transparent point adhesive film.
The method according to claim 1,
Wherein the thickness ratio of the adhesive layer and the adhesive layer is 1: 1 to 10: 1
Transparent point adhesive film.
A conductive plastic film layer having a conductive layer formed on one surface thereof;
A transparent spot adhesive layer formed by further photo-curing the transparent spot adhesive film according to any one of claims 1 to 14 laminated on the conductive layer; And
And a cover window layer
The touch screen panel comprising:
16. The method of claim 15,
Wherein the transparent point adhesive film is formed by laminating the adhesive layer in the direction in which the adhesive layer contacts the cover window layer and the adhesive layer in a direction in contact with the conductive layer to adhere the conductive plastic film layer and the cover window layer
Touch screen panel.
16. The method of claim 15,
Wherein the cover window layer comprises a hard coat layer formed on the surface in contact with the transparent spot adhesion layer,
Touch screen panel.
18. The method of claim 17,
The hard coat layer may comprise at least one selected from the group consisting of urethane acrylate, epoxy acrylate, polyether acrylate, polyester acrylate, dipentaacrythritol hexaacrylate, dipentacrythritol pentaacrylate, pentaacrylate thiotetraacrylate, Hexaacrylate, dipentaerythritol pentaacrylate, and combinations thereof. &Lt; RTI ID = 0.0 &gt;
Touch screen panel.
18. The method of claim 17,
The cover window layer does not have a hard coating layer formed on the surface in contact with the transparent point adhesive layer,
In the transparent point-bonding adhesive layer, the adhesive layer contains a carboxyl group-containing acrylic thermosetting resin and a photocurable compound in a weight ratio of 1: 2 to 5: 1
Touch screen panel.
16. The method of claim 15,
Wherein the conductive plastic film is a polyethylene terephthalate film formed on one side of the ITO (conductive metal oxide) layer
Touch screen panel.
16. The method of claim 15,
The cover window may be a transparent glass replacement plastic film or tempered glass
Touch screen panel.

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