KR20130035354A - Flat panel display device - Google Patents

Abstract

PURPOSE: A flat panel display device is provided to prevent the reduction of durability and conduction rates by controlling the occurrence of corrosion. CONSTITUTION: A touch panel(20) including a conductive layer of a silver nanowire(23) is accumulated on a display panel(10). A window(30) is accumulated on the touch panel, and an adhesive layer(40) is opened between the touch panel and the display panel. The adhesive layer includes monofunctional urethane acrylate oligomer, a first monofunctional dilution monomer, and second monofunctional dilution monomer. The touch panel provides the adhesive layer between the silver nanowires, or between the touch panel and the silver nanowire.

Description

Flat Panel Display {FLAT PANEL DISPLAY DEVICE}

The present invention relates to a flat panel display device which is free of corrosion caused by an adhesive containing an acid component and has excellent adhesion and durability.

In general, various portable electronic devices such as mobile phones and PDAs include a display device for displaying an image. Various types of display devices may be used, but flat panel display devices such as LCDs and organic light emitting diodes (OLEDs) having excellent space efficiency are widely used.

In the flat panel display, components such as a touch panel for input and a protection window may be stacked on the display panel on which an image is displayed.

Since the touch panel can replace a separate input device connected to an image display device such as a keyboard and a mouse, its use range is gradually expanding.

As a touch panel, a resistive film type, a light sensing type, and a capacitive type are known. In the dual capacitive type touch screen panel, a conductive sensing pattern is different when a human hand or an object is touched. By detecting a change in capacitance formed in the sensing pattern or the ground electrode, the contact position is converted into an electrical signal.

To this end, the touch panel includes a conductive layer having transparency and electrical conductivity, specifically, a vacuum deposited metal oxide such as indium tin oxide (ITO).

Conventionally, a touch panel using an ITO electrode uses an adhesive in which an acid component is excluded in consideration of corrosion of the ITO electrode [Korean Patent Publication No. 2011-8761]. However, the pressure-sensitive adhesive is improved corrosion resistance, but the disadvantages such as durability and adhesive strength is lowered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flat panel display device which is excellent in adhesive force, durability, and the like without corrosion occurring due to an adhesive containing an acid component.

The present invention has been found that a flat panel display device using a touch panel including a conductive layer of silver nanowires and a specific adhesive containing an acid component can improve adhesion and durability without causing corrosion.

Accordingly, the present invention provides a display panel; A touch panel including a conductive layer of silver nanowires on the display panel; And a window stacked on the touch panel, the adhesive layer being interposed between the display panel and the touch panel and between the touch panel and the window, wherein the adhesive layer is a monofunctional urethane acrylate oligomer; A first monofunctional dilution monomer having an isobonyl group; A second monofunctional dilution monomer having a weight average molecular weight of 200 or more and having a carboxyl group and an ethylenically unsaturated group at each end thereof; And a photopolymerization initiator.

The touch panel may include one or more layers of silver nanowires on one or both surfaces of the substrate.

The pressure sensitive adhesive layer may be interposed between the silver nanowires or between the substrate and the silver nanowires.

The substrate may be a glass substrate or a polymer film.

The touch panel may include two silver nanowires to calculate the position coordinates (X, Y).

The touch panel may be attached by interposing the pressure-sensitive adhesive layer between different position coordinate calculating substrates, between different position coordinate calculating silver nanowires, or between one side calculating substrate and the other side calculating silver nanowires. Can be.

The pressure-sensitive adhesive layer is 30 to 76% by weight monofunctional urethane acrylate oligomer; 5 to 50% by weight of the first monofunctional dilution monomer having an isobonyl group; 17 to 57% by weight of the second monofunctional dilution monomer having a weight average molecular weight of 200 or more, each having a carboxyl group and an ethylenically unsaturated group at each terminal; And 0.1 to 5 wt% of a photopolymerization initiator.

The flat panel display device of the present invention can be stored for a long time due to corrosion does not occur even though the adhesive containing the acid component is prevented, it is possible to reduce the durability life and change in conductivity caused by the corrosion.

In addition, the flat panel display device of the present invention is excellent in adhesive strength and durability compared to the pressure-sensitive adhesive that is excluded from the acid component used in conventional transparent electrodes such as ITO.

1 is a schematic diagram of a flat panel display device of the present invention;
2 to 4 are schematic diagrams of a flat panel display device according to an exemplary embodiment of the present invention.

The present invention relates to a flat panel display device which is free of corrosion caused by an adhesive containing an acid component and has excellent adhesion and durability.

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the flat panel display device of the present invention includes: a display panel 10; A touch panel 20 including a conductive layer of silver nanowires on the display panel; And a window 30 stacked on the touch panel, and the adhesive layer 40 is interposed between the display panel and the touch panel and between the touch panel and the window.

The pressure-sensitive adhesive layer is a monofunctional urethane acrylate oligomer; A first monofunctional dilution monomer having an isobonyl group; A second monofunctional dilution monomer having a weight average molecular weight of 200 or more and having a carboxyl group and an ethylenically unsaturated group at each end thereof; And photoinitiators.

The pressure-sensitive adhesive layer interposed in the flat panel display device of the present invention is limited to a specific pressure-sensitive adhesive layer having the above composition.

The display panel 10 displays data such as text and an image, and the like may be a flat panel such as a liquid crystal display (LCD) panel or an organic light emitting diode (OLED) panel. The driver IC 210 for controlling the display function may be mounted on the display panel in a chip on glass (COG) method.

The touch panel 20 may include a conductive layer of silver nanowires. The touch panel may include one or more layers of silver nanowires 23 on one or both surfaces of the substrate 21.

In addition, the adhesive layer may be interposed between the silver nanowires or between the substrate and the silver nanowires.

In this case, the substrate 21 may be a glass substrate or a polymer film. The polymer film may be polyacrylate, polyolefin, polyvinyl chloride, polyvinyl chloride, fluoropolymer, polyamide, polyimide, polysulfone, silicone, Glass resin, polyetheretherketone, polynorbornene, polyester, polyvinyls, acrylonitrile-butadiene-styrene copolymer (acrylonitrile-butadiene- It can be prepared using a high molecular compound of styrene copolymer, polycarbonate, copolymers thereof or mixtures thereof. It is preferable to use polyethylene terephthalate in polyolefin in consideration of permeability and economic aspects, dimensional stability of the process and the like.

The touch panel includes two silver nanowires to calculate the position coordinates (X, Y). Specifically, the positional coordinates of the X-axis and the Y-axis are calculated using the potential distribution generated from each silver nanowire.

In this case, the touch panel is attached by interposing the pressure-sensitive adhesive layer between different position coordinate calculation substrates, between different position coordinate calculation silver nanowires, or between one side calculation substrate and the other side coordinate silver nanowires. Can be.

The window 30 is disposed above the display panel to protect the display panel, and transmits light emitted from the display panel so that an image displayed on the display panel is viewed from the outside. The window may be made of plastic or glass material such as acrylic having impact resistance.

The present invention uses a pressure-sensitive adhesive layer made of a specific pressure-sensitive adhesive composition in order to improve the adhesion and adhesion durability between the respective components of the flat panel display device. In particular, the pressure-sensitive adhesive composition is effective in adhesion of a touch panel including an acid-containing conductive layer of silver nanowires having excellent adhesion and durability and high corrosion resistance to acids.

The pressure-sensitive adhesive layer 40 of the present invention is a monofunctional urethane acrylate oligomer; A first monofunctional dilution monomer having an isobonyl group; A second monofunctional dilution monomer having a weight average molecular weight of 200 or more and having a carboxyl group and an ethylenically unsaturated group at each end thereof; And a pressure-sensitive adhesive composition containing a photopolymerization initiator.

More preferably, the pressure-sensitive adhesive composition is 30 to 76% by weight monofunctional urethane acrylate oligomer; 5 to 50% by weight of the first monofunctional dilution monomer having an isobonyl group; 17 to 55% by weight of the second monofunctional dilution monomer having a carboxylic acid and an ethylenically unsaturated group having a weight average molecular weight of 200 or more; And 0.1 to 5 wt% of a photopolymerization initiator.

The urethane acrylate oligomer is a component that maintains viscoelasticity and storage modulus by imparting physical properties and flexibility as an adhesive, and in particular, the present invention is characterized by using a monofunctional urethane acrylate oligomer which is not polyfunctional. When the polyfunctional urethane acrylate oligomer is used, the tacky of the surface is reduced and the cohesive force is excessively high, so that the expression of adhesive properties is not easy.

The monofunctional urethane acrylate oligomer may be one obtained by generally reacting a (meth) acrylate monomer having a polyol, a diisocyanate compound and a hydroxy group. Specifically, a (meth) acrylic monomer having a hydroxy group and a urethane functional group generated by the reaction of the main chain portion, the polyol and the isocyanate compound due to the molecular structure of the polyol is bonded to produce an acryloyl functional group at the terminal.

The polyols include polyols, polyesters, polyolefins, polyacrylates, polycarbonates, polycaprolactones, or polyols having a mixed molecular structure thereof, and among these, in terms of ease of viscosity control and price Polyols, polyesters or polyols having a mixed molecular structure thereof are preferred. For example, when using a cyclic ether polyol such as ethylene oxide, propylene oxide or tetrahydrofuran, a urethane acrylate oligomer having an ether main chain can be prepared. In addition, when using a cyclic ester polyol such as ε-caprolactone or pivalolactone, an oligomer having an ester backbone can be prepared.

As the diisocyanate compound, 1,4-butylene diisocyanate, 1,6-hexamethylene diisocyanate, cyclopentylene-1,3-diisocyanate, 4,4'-dicyclohexyl methane diisocyanate, isophorone diisocyanate , Cyclohexene-1,4-diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-methylenebis (phenylisocyanate), 2,2-diphenylpropane-4,4 '-Diisocyanate, p-phenylenedi isocyanate, m-phenylene diisocyanate, xylene diisocyanate, 1,4-naphthylene diisocyanate, 1,5-naphthylene diisocyanate, 4,4'-diphenyl diisocyanate, azobenzene And aliphatic diisocyanate compounds such as -4,4'-diisocyanate, m- or p-tetramethylxylene diisocyanate, 1-chlorobenzene-2,4-diisocyanate, and these may be used alone or in combination of two or more. It can be mixed and used.

As an acrylic monomer which has a hydroxy group, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate Hydroxyalkylene (2-4) glycol (meth) such as 6-hydroxyhexyl (meth) acrylate, 2 hydroxyethylene glycol (meth) acrylate and 2-hydroxypropylene glycol (meth) acrylate An acrylate etc. are mentioned, These can be used individually or in mixture of 2 or more types.

The manufacturing method of a monofunctional urethane acrylate oligomer is not specifically limited. For example, a polyol and a diisocyanate compound are reacted in excess in an appropriate equivalent ratio, preferably in order to improve the reaction efficiency, to obtain a prepolymer having a urethane group, and the (meth) acrylate monomer having a hydroxy group By reacting at an appropriate equivalence ratio, a monofunctional urethane acrylate oligomer in which one end is formed with an acryloyl group and the other end is formed with an alcohol group can be prepared. At this time, an appropriate amount of alcohol (eg, butanol) can be added.

The monofunctional urethane acrylate oligomer may have a weight average molecular weight (Mw) of 1,000 to 40,000, preferably 1,000 to 35,000. When the weight average molecular weight is less than 1,000, the content of the acrylic group may be increased to form a film, and when the weight average molecular weight is greater than 35,000, the viscosity may be increased and the handleability may be deteriorated.

In addition, the monofunctional urethane acrylate oligomer has a glass transition temperature (Tg) of -60 to 50 ° C, preferably -60 to 20 ° C. If the glass transition temperature (Tg) is less than -60 ° C, durability may be degraded at high temperature, and if the glass transition temperature (Tg) is higher than 50 ° C, durability and thermal shock at low temperature may be weak.

The monofunctional urethane acrylate oligomer is preferably included in 30 to 76% by weight, more preferably 40 to 70% by weight based on 100% by weight of the total pressure-sensitive adhesive composition. If the content is less than 30% by weight, the viscosity of the pressure-sensitive adhesive composition is low, the coating property is not good, if the content is more than 76% by weight, the viscosity is increased, the processability may be lowered, and may be difficult to apply for the optical.

The present invention controls the viscosity of the pressure-sensitive adhesive composition and at the same time uses a monofunctional urethane acrylate oligomer and a crosslinkable functional group as two diluent monomers mixed with two different monofunctional diluent monomers.

Especially as a 1st monofunctional dilution monomer, the monomer which has the isobornyl group which is an alicyclic group of a three-dimensional structure is selected and used. This monomer has a glass transition temperature of 80 ° C. or higher, preferably 80 to 150 ° C., and when used with monofunctional urethane acrylate oligomers, it is a component that greatly improves the adhesive strength, especially the adhesion to a substrate made of an inorganic material such as glass. . In addition, compared to other monofunctional acrylate monomers having a relatively low glass transition temperature, there is an advantage of high curing efficiency during curing.

As a 1st monofunctional dilution monomer, an isobonyl acrylate, an isobonyl methacrylate, or a mixture thereof is mentioned.

The first monofunctional dilution monomer is preferably included in 5 to 50% by weight, more preferably 5 to 35% by weight based on 100% by weight of the total pressure-sensitive adhesive composition. If the content is less than 5% by weight, sufficient dilution may not be made, so that the viscosity of the pressure-sensitive adhesive composition may be excessively high. If the content is more than 50% by weight, the tacky property of the pressure-sensitive adhesive may be degraded and the film may be hard.

As a 2nd monofunctional dilution monomer, a weight average molecular weight is 200 or more, respectively at both ends. The monomer which has a carboxyl group [COOH-] and an ethylenically unsaturated group is selected and used. That is, the monomer which has a carboxyl group at one terminal and an ethylenically unsaturated group at the other terminal is used, and the compound which has two substituents only in either terminal is excluded. This monomer is used to adjust the viscosity of the pressure-sensitive adhesive composition to facilitate coating, and is used in conjunction with the first monofunctional diluent monomer, and not only glass but also various polymer films such as polyethylene terephthalate (PET) film and triacetyl cellulose (TAC) film. It is a component which improves adhesiveness or adhesive force with respect to the film mainly used for optics as mentioned above, and suppresses cure shrinkage.

It is preferable that a weight average molecular weight of a 2nd monofunctional dilution monomer is 200 or more, More preferably, it is 200-500. When the weight average molecular weight is less than 200, curing shrinkage may occur during photopolymerization curing, and when the weight average molecular weight is greater than 500, the viscosity becomes excessively high and it is difficult to sufficiently dilute the monofunctional urethane acrylate oligomer.

In addition, the second monofunctional diluent monomer may have a glass transition temperature of 1 ° C or higher, preferably 1 to 150 ° C, more preferably 1 to 100 ° C. When the glass transition temperature is less than 1 ° C., the adhesion to the polymer film as well as the substrate, such as an inorganic material may be lowered.

As a 2nd monofunctional dilution monomer, the compound of the structure in which the dicarboxylic acid was substituted for the mono-2-acryloyloxyethyl structure is mentioned. Considering the range of the weight average molecular weight, dicarboxylic acid substituted may include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, phthalic acid, isophthalic acid, terephthalic acid, and the like. Among them, a compound having a structure in which succinic acid and phthalic acid are substituted with dicarboxylic acid from the viewpoint of photopolymerization curing rate, curing shrinkage, and securing adhesive properties. Commercially available compounds having such a structure include 2- (meth) acryloyloxyethyl succinate, 2- (meth) acryloyloxyethyl hexahydrophthalate, 2- (meth) acryloyloxyethylhydrogen Phthalate etc. are mentioned. These can be used individually or in mixture of 2 or more types.

The second monofunctional dilution monomer is preferably included in 17 to 57% by weight, more preferably 20 to 40% by weight based on 100% by weight of the total pressure-sensitive adhesive composition. When the content is less than 17% by weight, it may be difficult to secure sufficient adhesion to the polymer film, and when the content is greater than 57% by weight, hardening shrinkage may occur severely during photopolymerization curing or the final pressure-sensitive adhesive layer may be excessively hard.

In the present invention, the first and second monofunctional dilution monomers may further include a bifunctional or higher polyfunctional diluent monomer within a range that does not impair the effects of the present invention.

As the polyfunctional diluent monomer, 1,3-butanedioldi (meth) acrylate, 1,4-butanedioldi (meth) acrylate, 1,6-hexanedioldi (meth) acrylate, 2-butyl-2-ethyl -1,3-propanedioldiacrylate, 1,9-nonanedioldiacrylate, ethylene glycol di (meth) acrylate, bisphenol A-ethylene glycol diacrylate, diethylene glycol di (meth) acrylate, tri Ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, neopentyl Glycoldi (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (meth) acrylate, ethylene oxide modified phosphoric acid di (meth) acrylate, bis (2-hydroxyethyl) Isocyanure Tdi (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyldi (meth) acrylate, dimethyloldicyclopentanediacrylate, ethylene oxide modified hexahydrophthalic acid diacrylate, tricyclodecane Difunctional monomers such as dimethanol acrylate, neopentylglycol-modified trimethylolpropanediacrylate, and adamantane diacrylate; Trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified trimethylolpropane tri (meth) acrylate, propylene oxide modified trimethylolpropane tree Trifunctional monomers such as (meth) acrylate, tris (2-hydroxyethyl) isocyanurate tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, and glycerol tri (meth) acrylate; Tetrafunctional monomers such as diglycerin tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, and tetramethylolpropane tetra (meth) acrylate; Pentafunctional monomers such as dipentaerythritol penta (meth) acrylate and propionic acid-modified dipentaerythritol penta (meth) acrylate; Hexafunctional monomers, such as dipentaerythritol hexa (meth) acrylate and caprolactone modified dipentaerythritol hexa (meth) acrylate, etc. are mentioned.

A photoinitiator is a component for fully advancing hardening of the surface as well as the inside of the coated adhesive composition, If it is known in the art, the kind is not specifically limited. Specifically, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, hydroxydimethylacetophenone, dimethylaminoacetophenone, Dimethoxy-2-phenylacetophenone, 3-methylacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 4-chronolocetophenone, 4, 4-dimethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 4-hydroxycyclophenylketone, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4 -(Methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenyl Benzophenone, 4,4-diaminobenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, anthraquinone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 2-aminoanthraquinone, 2-meth Tyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, diphenyl ketone benzyl dimethyl ketal, acetophenone Dimethyl ketal, p-dimethylaminobenzoic acid ester, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, fluorene, triphenylamine, carbazole and the like. Moreover, as a commercially available product, brand names Darocur 1173, Irgacure 184, Irgacure 907, Irgacure 1700 (Ciba company), etc. can also be used. These can be used individually or in combination of 2 or more types.

The photopolymerization initiator is preferably included in 0.1 to 5% by weight based on 100% by weight of the pressure-sensitive adhesive composition. When the content is less than 0.1% by weight, the curing rate may be slow and sufficient curing may be difficult to proceed, and when the content is more than 5% by weight, the molecular weight to be photopolymerized may be reduced to decrease durability.

In addition to the components as described above, the pressure-sensitive adhesive composition in order to adjust the adhesion, cohesion, viscosity, elastic modulus, glass transition temperature, color, antistatic properties, etc. required according to the application, adhesiveness-providing resin, silane coupling agent, antioxidant, corrosion Known additives such as inhibitors, leveling agents, surface lubricants, dyes, pigments, antifoams, fillers, light stabilizers, antistatic agents and the like may be further included.

The pressure-sensitive adhesive composition is photocured to form a pressure-sensitive adhesive layer.

In addition, the pressure-sensitive adhesive film may be formed between the two release films through the pressure-sensitive adhesive layer of the pressure-sensitive adhesive composition.

2 to 4 show an exemplary flat panel display according to the present invention. Specifically, FIG. 2 illustrates the pressure-sensitive adhesive layer 40, the silver nanowires 23, the substrate 21, the silver nanowires 23, the pressure-sensitive adhesive layer 40, and the window 30 from the display panel 10. It is a stacked flat panel display device.

3 shows the pressure-sensitive adhesive layer 40, the substrate 21, the silver nanowires 23, the pressure-sensitive adhesive layer 40, the silver nanowires 23, the substrate 21, and the pressure-sensitive adhesive layer from the display panel 10. The flat panel display is stacked in the order of the 40 and the window 30.

4 shows the pressure-sensitive adhesive layer 40, the substrate 21, the silver nanowires 23, the pressure-sensitive adhesive layer 40, the substrate 21, the silver nanowires 23, and the pressure-sensitive adhesive layer from the display panel 10. The flat panel display is stacked in the order of the 40 and the window 30.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but these examples are merely illustrative of the present invention and are not intended to limit the scope of the appended claims. It is apparent to those skilled in the art that various changes and modifications can be made to the present invention, and such modifications and changes belong to the appended claims.

Preparation Example 1 Manufacture of Conductive Layer

The PET base film was fixed to the spin coater, silver nanowire ink (Clearom Ink, Cambrios Technology Corporation) was dropped with the dropper and then coated for 2500 rpm and 60 sec. At this time, the thickness of the coating layer was to maintain 80nm. After 120 seconds at 50 ℃, and then cured for 90 seconds at 140 ℃ to prepare a conductive layer.

The conductive layer prepared above had a surface resistivity of 140 Ω / □ and a 550 nm transmittance of 91.90%.

Comparative Production Example 1

ITO film (ICPC-125H-300R, Korea Spistech)

Preparation Examples 2 to 3 and Comparative Preparation Examples 2 to 5: preparing an adhesive film

The pressure-sensitive adhesive composition in which the components shown in Table 1 were mixed was coated on a transparent base film coated with a silicone release agent to have a thickness of 300 μm, and irradiated with ultraviolet rays at a speed of 4 m / min (600 mJ / cm 2). After laminating the same transparent base film on the surface irradiated with ultraviolet rays and irradiated with ultraviolet rays at a speed of 4 m / min (600 mJ / cm 2) again, the adhesive film was completely cured.

division Monofunctional urethane acrylate oligomer First dilution monomer Second dilution monomer Photopolymerization
Initiator Ⅰ-1 Ⅰ-2 II-1 II-2 II-3 Preparation Example 2 60 29 - 10 - - One Production Example 3 60 29 - - 10 - One Comparative Production Example 2 69 30 - - - - One Comparative Production Example 3 69 - - 30 - - One Comparative Production Example 4 12.5 - 74.7 - 12.3 0.3 0.2 Comparative Preparation Example 5 20.5 - 79.0 - - 0.3 0.2 Monofunctional urethane acrylate oligomer: Monofunctional urethane acrylate oligomer of ether backbone (DFCN-5, Negami Chemistry: Mw 31,000, Tg -57 ° C)
Ⅰ-1: Isobonyl acrylate (Tg 94 ℃)
I-2: 2-ethylhexyl acrylate (Tg -60 degreeC)
II-1: 2-acryloyloxyethyl hexahydrophthalate (Mw 294, Tg 10 degreeC)
II-2: 2-acryloyloxyethyl succinate (Mw 230, Tg 9 degreeC)
II-3: trimethylolpropane triacrylate (Mw 296, Tg 62 ° C)
Photopolymerization initiator: Darocure 1173 (ciba)

Examples and Comparative Examples

The flat panel display device of FIG. 1 was configured by using a combination of the Preparation Example and Comparative Preparation Example shown in Table 2 below.

division Conductive film Adhesive film Example 1 Preparation Example 1 (Silver Nano Wire) Preparation Example 2 Example 2 Preparation Example 1 (Silver Nanowires) Production Example 3 Comparative Example 1 Comparative Production Example 1 (ITO Film) Preparation Example 2 Comparative Example 2 Comparative Production Example 1 (ITO Film) Production Example 3 Comparative Example 3 Preparation Example 1 (Silver Nanowires) Comparative Production Example 2 Comparative Example 4 Comparative Production Example 1 (ITO Film) Comparative Production Example 2 Comparative Example 5 Preparation Example 1 (Silver Nanowires) Comparative Production Example 3 Comparative Example 6 Preparation Example 1 (Silver Nanowires) Comparative Production Example 4 Comparative Example 7 Preparation Example 1 (Silver Nanowires) Comparative Preparation Example 5

Test Example

Physical properties of the flat panel display devices manufactured in Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 2 below.

1.Glass adhesion (N / 25mm)

After peeling off the base film coated with the release agent laminated on the adhesive film, the PET base film was not laminated. The adhesive sheet was cut into a size of 25 mm × 250 mm using a super cutter, bonded to glass, fixed to an autograph, and then peeled by 180 ° PEEL at a speed of 300 m / min.

2. Durability (Heat and humidity evaluation)

After peeling the base film coated with the release agent laminated on the adhesive film, the prepared conductive film was laminated, and then the remaining release film of the adhesive film was peeled off, and then the same conductive film was laminated again. After cutting the conductive film, the adhesive sheet is laminated to A4 size using a super cutter, and treated in an autoclave for 20 minutes at 50 ℃, 5 atm conditions, and then left 1000 hours in a 60 ℃, 90% RH moisture-resistant oven. The appearance was evaluated according to the following criteria.

<Evaluation Criteria>

◎: bubbles of less than 1 μm occur in the outside after evaluating damp heat

○: After evaluating the heat-and-moisture heat, 5 or less bubbles having a thickness of 1 μm or less occur on the outside.

(Triangle | delta): Less than 10 micrometers of 1 micrometer or less generate | occur | produce on the outer side after a heat-and-moisture evaluation.

X: 15 or more bubbles of 1 micrometer or less generate | occur | produce in the outer side after evaluation of heat-and-moisture heat.

In addition, when bubbles of 2 µm or more are generated, it is × regardless of the number.

3. Conductivity change rate (%)

A conductive film including a conductive layer having a size of 100 mm × 200 mm and an adhesive film having a size of 80 mm × 160 mm were cut using a super cutter, and then a conductive layer and an adhesive layer were bonded. Thereafter, electrodes were made at both ends of the conductive layer by using a conductive tape, and the resistance was measured using an electrical resistance measuring instrument (HIOKI's 3244 card high tester) after being left for 250 hours under curing conditions of 60 ° C. and 90% RH.

At this time, when the conductivity change rate exceeds 100%, it can be determined that corrosion proceeds due to acid and the resistance value is increased.

division Conductive film Adhesive film Adhesion (N / 25mm) durability Conductivity change rate
(%) Example 1 Preparation Example 1 (Ag) Preparation Example 2 26 ◎ -97 Example 2 Preparation Example 1 (Ag) Production Example 3 23 ○ -96 Comparative Example 1 Comparative Production Example 1 (ITO) Preparation Example 2 29 ◎ 110 Comparative Example 2 Comparative Production Example 1 (ITO) Production Example 3 25 ◎ 108 Comparative Example 3 Preparation Example 1 (Ag) Comparative Production Example 2 16 △ -96 Comparative Example 4 Comparative Production Example 1 (ITO) Comparative Production Example 2 14 △ -96 Comparative Example 5 Preparation Example 1 (Ag) Comparative Production Example 3 25 × -99 Comparative Example 6 Preparation Example 1 (Ag) Comparative Production Example 4 5 × -99 Comparative Example 7 Preparation Example 1 (Ag) Comparative Preparation Example 5 6 × -97

As shown in Table 3, the flat panel display device of Examples 1 to 2 including the silver nanowires and the specific pressure-sensitive adhesive layer according to the present invention was confirmed to have excellent adhesion, durability, conductivity change rate, and the like.

On the other hand, in Comparative Examples 1 and 2, the conductivity change rate was higher than 100%, and Comparative Examples 3 to 7 were found to significantly reduce the adhesion and durability.

10: display panel
20: touch panel
21 substrate 23 silver nanowire
30: Windows
40: adhesive layer

Claims (7)

Display panel; A touch panel including a conductive layer of silver nanowires on the display panel; And windows are stacked on the touch panel,
An adhesive layer is interposed between the display panel and the touch panel and between the touch panel and the window.
The pressure-sensitive adhesive layer is a monofunctional urethane acrylate oligomer; A first monofunctional dilution monomer having an isobonyl group; A second monofunctional dilution monomer having a weight average molecular weight of 200 or more and having a carboxyl group and an ethylenically unsaturated group at each end thereof; And a photopolymerization initiator.
The flat panel display of claim 1, wherein the touch panel includes at least one layer of silver nanowires on one or both surfaces of the substrate.
The flat panel display of claim 2, wherein the touch panel includes the adhesive layer interposed between the silver nanowires or between the substrate and the silver nanowires.
The flat panel display of claim 3, wherein the substrate is a glass substrate or a polymer film.
The flat panel display of claim 1, wherein the touch panel includes two silver nanowires to calculate position coordinates (X, Y).
The method according to claim 5, wherein the touch panel is the pressure-sensitive adhesive between the substrate for calculating the different position coordinates, between the silver nanowires for calculating the different position coordinates, or between the substrate for calculating the coordinates on one side and the silver nanowires for calculating the coordinates on the other side. Flat panel display device that is attached to the interlayer.
The method according to claim 1, wherein the pressure-sensitive adhesive layer is 30 to 76% by weight monofunctional urethane acrylate oligomer; 5 to 50% by weight of the first monofunctional dilution monomer having an isobonyl group; 17 to 57% by weight of the second monofunctional dilution monomer having a weight average molecular weight of 200 or more, each having a carboxyl group and an ethylenically unsaturated group at each terminal; And 0.1 to 5% by weight of a photopolymerization initiator.

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