KR102187823B1 - Touch window - Google Patents

Abstract

The touch window according to the embodiment includes: a substrate; And an electrode portion formed of a pattern layer and an electrode layer disposed on the substrate, wherein the pattern layer is selected from the group consisting of (a) polycarbonate polyol, polycaprolactone polyol, and combinations thereof. Urethane acrylate oligomer containing any one of, (b) a monomer having a double bond, (c) a photopolymerization initiator and (d) a photocurable resin composition comprising a curing accelerator, and in the substrate The difference in retardation according to the incident angle of light at is less than 0.2%.

Description

Touch window {TOUCH WINDOW}

The embodiment relates to a touch window.

Recently, in various electronic products, a touch panel for inputting an image displayed on a display device by contacting an input device such as a finger or a stylus has been applied.

The touch panel may be typically classified into a resistive type touch panel and a capacitive type touch panel. When a pressure is applied to an input device, a resistive touch panel detects a change in resistance according to a connection between electrodes and detects a position. The capacitive touch panel detects a change in capacitance between electrodes when a finger touches it and detects a position. In consideration of the convenience and sensing power of the manufacturing method, the capacitive method has recently attracted attention in small models.

As the transparent electrode of such a touch panel, generally well-known indium tin oxide (ITO) may be used. However, in the case of the ITO electrode, there are many problems. ITO electrodes require a vacuum process such as sputtering or chemical vapor deposition for ITO coating and the scarcity of the indium material constituting ITO, so the manufacturing process cost is relatively high. In addition, there is a problem in that the ITO electrode is physically easily hit by bending and bending of the substrate, so that the characteristics of the electrode are deteriorated, and thereby is not suitable for a flexible device. In addition, the ITO electrode exhibits high resistance characteristics, and there is a limit to a large area.

In order to solve this problem, active research on an alternative electrode is being conducted. In particular, it is intended to replace ITO by forming a metal material in a mesh shape. At this time, when forming a mesh, a mesh may be formed using nanopatterns and micropatterns. For example, a pattern may be formed by forming a resin layer on a substrate and imprinting the resin layer with a mold. Thereafter, an electrode layer may be formed on the pattern.

A photocurable resin may be used for the resin layer used in the imprinting process. General photocurable resins have a large volume contraction and have a smaller curing density than other types of resins. In addition, there is a problem in that different resins are used depending on the type of substrate used when forming the mold. In addition, when the resin must be adhered to the substrate, but the substrate is a non-adhesive material, there is a problem that the resin layer is separated from the substrate.

The embodiment is to provide a touch window with improved reliability.

The touch window according to the embodiment includes: a substrate; And an electrode portion formed of a pattern layer and an electrode layer disposed on the substrate, wherein the pattern layer is selected from the group consisting of (a) polycarbonate polyol, polycaprolactone polyol, and combinations thereof. Urethane acrylate oligomer containing any one of, (b) a monomer having a double bond, (c) a photopolymerization initiator and (d) a photocurable resin composition comprising a curing accelerator, and in the substrate The difference in retardation according to the incident angle of light at is less than 0.2%.

The substrate according to the embodiment has substantially the same refractive index in any direction such as a surface direction or a thickness direction. Accordingly, it is possible to improve a moire phenomenon, a blackout phenomenon (a phenomenon in which the screen looks black at a specific angle), and a rainbow phenomenon (a rainbow stain). That is, visibility can be improved.

In addition, the water absorption of the substrate is 0.1% or less. Therefore, even when exposed to an environment with high humidity, moisture absorption in the touch window can be prevented, thereby improving reliability and durability. That is, moisture absorption of the electrode portion disposed on the electrode substrate can be prevented.

In addition, while preventing moisture absorption of the electrode portion disposed on the electrode substrate, adhesion with the electrode portion disposed on the substrate may be improved. Accordingly, even if the electrode portion is formed of various types of materials, it can be stably formed without peeling or film removal of the electrode portion.

In addition, the resin composition according to the embodiment forms a pattern layer of the electrode part, has low volume shrinkage, high curing density, and has adhesion properties with various materials. For this reason, even if the substrate is made of a non-adhesive material, it may have adhesiveness.

In addition, since the resin composition has excellent adhesion regardless of the material of the substrate, it is possible to solve the problem that the resin composition must be different according to the substrate.

1 is a plan view of a touch window according to a first embodiment.
FIG. 2 is a cross-sectional view illustrating a cross section taken along AA′ of FIG. 1.
3 and 4 are diagrams for describing a substrate according to an embodiment.
5 is a cross-sectional view of a touch window according to a second embodiment.

In the description of the embodiments, each layer (film), region, pattern, or structure is “on” or “under/under” the substrate, each layer (film), region, pad or patterns. The description that "is formed in" includes both directly or through another layer. The criteria for the top/top or bottom/bottom of each layer will be described based on the drawings.

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

1 is a plan view of a touch window according to a first embodiment, FIG. 2 is a cross-sectional view taken along AA′ of FIG. 1, and FIGS. 3 and 4 are views for explaining a substrate according to an embodiment. , FIG. 5 is a cross-sectional view of a touch window according to a second embodiment.

First, a touch window according to a first embodiment will be described with reference to FIGS. 1 and 2. 1 is a plan view of a touch window according to a first embodiment, FIG. 2 is a cross-sectional view taken along AA′ of FIG. 1, and FIGS. 3 and 4 are views for explaining a substrate according to an embodiment. .

Referring to FIG. 1, the touch window 10 according to the embodiment includes an effective area AA for detecting the position of an input device (eg, a finger, etc.) and an ineffective area AA disposed around the effective area AA. It includes a substrate 100 on which an area UA is defined.

Here, the electrode part 200 may be formed in the effective area AA to detect the input device. In addition, a wiring 300 electrically connecting the electrode unit 200 may be formed in the non-effective area UA. In addition, an external circuit connected to the wiring 300 may be positioned in the non-effective area UA.

When an input device such as a finger comes into contact with such a touch window, a difference in capacitance occurs at a portion where the input device is in contact, and a portion where the difference occurs may be detected as a contact position. This touch window will be described in more detail as follows.

The substrate 100 may be formed of various materials capable of supporting the electrode portion 200, the wiring 300, and a circuit board formed thereon. In this case, a difference in retardation according to an incident angle of light within the substrate 100 may be less than 0.2%. Specifically, the retardation difference according to the incident angle of light within the substrate 100 may be 0.001% to 0.2%. That is, referring to FIG. 3, the retardation according to the incident angle of light in the substrate 100 may be 5 nm or less. The retardation according to the incident angle of light in the substrate 100 is greater than 0 nm and less than 5 nm.

On the other hand, in the case of polycarbonate (PC) or polyethylene phthalate (PET) used as a general substrate 100, the retardation value of the substrate 100 is 5 nm or less, compared to a retardation value of 20 nm or more. In addition, the refractive index is almost the same in any direction, such as the surface direction or the thickness direction of the substrate 100. Accordingly, it is possible to improve a moire phenomenon, a blackout phenomenon (a phenomenon in which the screen looks black at a specific angle), and a rainbow phenomenon (a rainbow stain). That is, visibility can be improved.

Meanwhile, the water absorption of the substrate 100 is 0.1% or less. That is, the moisture absorption of the substrate 100 is greater than 0% and less than 0.1%. Therefore, even when exposed to an environment with high humidity, moisture absorption in the touch window can be prevented, thereby improving reliability and durability. That is, the electrode part 200 is disposed on the substrate 100, and moisture absorption of the electrode part 200 may be prevented. In addition, moisture absorption of the electrode part 200 may be prevented, and adhesion to the electrode part 200 disposed on the substrate 100 may be improved. Therefore, even if the electrode part 200 is formed of various types of materials, it can be stably formed without peeling or film removal from the substrate 100.

Further, referring to FIG. 4, a wavelength dispersion of the substrate 100 at 400 nm/550 nm to 700 nm/550 nm is 0.9 to 1.1. Preferably, the wavelength dispersion of the substrate 100 at 400 nm to 700 nm is 1.0 to 1.05. In addition, the wavelength dispersion of the substrate 100 is uniform anywhere. Accordingly, it is possible to improve a moire phenomenon, a blackout phenomenon (a phenomenon in which the screen looks black at a specific angle), and a rainbow phenomenon (a rainbow stain). That is, visibility can be improved.

The substrate 100 may include a photoisotropic film. For example, the substrate 100 may include Cyclic Olefin Copolymer (COC), Cyclic Olefin Polymer (COP), photoisotropic polycarbonate (PC), or photoisotropic polymethylmethacrylate (PMMA).

An outer dummy layer (not shown) is formed in the non-effective area UA of the substrate 100. The outer dummy layer may be formed by coating a material having a predetermined color so that the wiring 300 and a printed circuit board connecting the wiring 300 to an external circuit are not visible from the outside. The outer dummy layer may have a color suitable for a desired appearance, and for example, may include black pigment and the like to exhibit black. In addition, a desired logo can be formed on the outer dummy layer in various ways. The outer dummy layer may be formed by deposition, printing, wet coating, or the like.

An electrode part 200 may be formed on the substrate 100. The electrode part 200 may be disposed on the effective area AA of the substrate 100. The electrode part 200 may be disposed on the effective area AA to serve as a sensor for sensing a touch. That is, the electrode unit 200 may detect whether an input device such as a finger is in contact. The electrode part 200 includes a first electrode part 210 and a second electrode part 220.

The first electrode unit 210 includes a first sensor unit 230 and a first sensor connection unit 250 connecting the first sensor unit 230 to each other. The first sensor unit 230 may extend in one direction. In addition, the first sensor connection part 250 may connect the first sensor part 230 in one direction.

The second electrode unit 220 includes a second sensor unit 240 and a second sensor connection unit 260 connecting the second sensor unit 240. The second sensor unit 240 may extend in another direction crossing the one direction. In addition, the second sensor connection part 260 may connect the second sensor part 240 in another direction.

The first sensor unit 230, the second sensor unit 240, and the second sensor connection unit 260 are disposed on the substrate 100. The first sensor unit 230, the second sensor unit 240, and the second sensor connection unit 260 may be disposed in direct contact with the substrate 100. The first sensor unit 230, the second sensor unit 240, and the second sensor connection unit 260 are disposed on the same plane.

Meanwhile, the first sensor connection unit 250 electrically connects the first sensor unit 230 to each other. In this case, an insulating part 420 is disposed between the first sensor connection part 250 and the second sensor connection part 260. An electrical short between the first sensor connection part 250 and the second sensor connection part 260 may be prevented through the insulation part 420. The insulating part 420 may be formed of a transparent insulating material that can insulate the first sensor connection part 250 and the second sensor connection part 260. For example, the insulating part 420 may be made of a metal oxide such as silicon oxide or an acrylic resin.

In FIG. 1, the electrode part 200 is shown to include two types of electrode parts 200 having a shape extending in one direction and a shape extending in the other direction on the substrate, but the embodiment is not limited thereto. Accordingly, the electrode part 200 may be formed to include only a shape extending in one direction.

In addition, although FIG. 1 illustrates that the electrode part 200 is arranged in a rhombus shape. The embodiment is not limited thereto, and the electrode part 200 may be arranged in various shapes such as a bar, a triangle, a polygon such as a square, a circle, a linear H shape, or an ellipse.

Meanwhile, the electrode part 200 is disposed in a mesh shape. In this case, the mesh shape may be randomly formed to prevent moire phenomenon. The moire phenomenon is a pattern created by overlapping periodic stripes. As neighboring stripes overlap, the thickness of the stripes becomes thicker, making them stand out compared to other stripes. Therefore, in order to prevent such moire phenomenon, the conductive pattern shape may be variously arranged.

Specifically, the electrode part 200 includes a mesh opening OA and a mesh line LA. In this case, the line width of the mesh line LA may be 0.1 µm to 10 µm. The mesh line LA having a line width of 0.1 μm or less may not be possible due to the manufacturing process. If the line width is 10 μm or less, the pattern of the electrode part 200 may be made invisible. Preferably, the line width of the conductive pattern line part LA may be 1 µm to 10 µm.

Meanwhile, as shown in FIG. 1, the mesh opening OA may have a rectangular shape. However, the embodiment is not limited thereto, and the mesh opening OA may have various shapes such as a diamond shape, a pentagonal shape, a hexagonal polygonal shape, or a circular shape.

Since the electrode part 200 has a mesh shape, the pattern of the electrode part 200 may not be visible on the effective area AA. That is, even if the electrode part 200 is formed of metal, the pattern can be made invisible. In addition, even when the electrode unit 200 is applied to a large-sized touch window, resistance of the touch window may be reduced. In addition, when the electrode part 200 is formed by a printing process, a high-quality touch window may be secured by improving print quality.

Referring to FIG. 2, the electrode part 200 may include a pattern layer 280 and an electrode layer 270. In this case, the pattern layer 280 may include a first sub-pattern 281 and a second sub-pattern 282.

The pattern layer 280 is disposed on the substrate 100. The pattern layer 280 may be formed of a photocurable resin. In this case, the pattern layer 280 may be formed of the resin composition according to the embodiment.

The resin composition according to the embodiment may include (a) a urethane acrylate oligomer, (b) a monomer having a double bond, (c) a photopolymerization initiator, and (d) a curing accelerator. In addition, the resin composition may further include (e) other additives.

The (a) urethane acrylate oligomer may be composed of polyol and isocyanate. The (a) urethane acrylate oligomer is composed of an acrylic group or a methacrylic group at the terminal.

The polyol may be any one selected from the group consisting of polycarbonate polyol, polycaprolactone polyol, and combinations thereof. For example, at least one of the repeating units represented by the following Chemical Formulas 1 and 2 may be included.

[Formula 1]

The l, m, and n are integers selected from 1 to 30.

[Formula 2]

The p and q are integers selected from 1 to 50.

The polyol may further include a repeating unit represented by Formula 3 below in addition to the repeating unit represented by Formula 1 and Formula 2.

[Formula 3]

R is an integer selected from 0 to 30. Including the repeating unit represented by Formula 3, the molecular weight of the urethane acrylate oligomer may be controlled, and compatibility and mechanical properties may be controlled. In addition, in order to include the repeating unit represented by Chemical Formula 3, ethylene oxide may be added as needed.

The polyol is any one selected from the group consisting of polycarbonate polyol, polycaprolactone polyol, and combinations thereof, and consists of a polyol having a linear structure, a polyol having a cyclic structure, and a combination thereof. Any one selected from the group may be further included.

Polyols having the linear structure include 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, and 3-methyl- In the group consisting of 1,5-pentanediol), 1,6-hexanediol, 3-methyl-1,6-hexanediol, and combinations thereof It may be any one selected, but is not limited thereto.

Polyols having the cyclic structure include benzenediol, naphthalenediol, bis(4-hydroxydiphenyl)methane, 1,1-bis(4-hydroxy Phenyl) ethane (1,1-bis (4-hydroxyphenyl) ethane), 2,2-bis (4-hydroxyphenyl) propane (2,2-bis (4-hydroxyphenyl) propane), 2,2-bis ( 4-hydroxyphenyl)butane (2,2-bis(4-hydroxyphenyl)butane), 1,1-bis(4-hydroxyphenyl)-1-phenylethane (1,1-bis(4-hydroxyphenyl)- 1-phenylethane), 2,2-bis (4-hydroxyphenyl) hexafluoropropane (2,2-bis (4-hydroxyphenyl) hexafluoropropane), bis- (4-hydroxyphenyl) diphenylmethane (bis- In the group consisting of (4-hydroxyphenyl)diphenylmethane), 2,2-bis(3-methyl-4-hydroxyphenyl)propane (2,2-bis(3-methyl-4-hydroxyphenyl)propane) and combinations thereof It may be any one selected, but is not limited thereto.

The isocyanate may be a cyclic or linear isocyanate having two or more functional groups. For example, methylene-bis (4-cyclohexylisocyanate) (methylene-bis (4-cyclohexylisocyanate), isophorone diisocyanate), 1,4-cyclohexane diisocyanate (1,4-cyclohexane diisocyanate), 2,4-toluene diisocyanate (2,4-toluene diisocyanate), 2,6-toluene diisocyanate (2,6-toluene diisocyanate), cyclohexylene-1,2-diisocyanate (cyclohexylene-1,2-diisocyanate) ), 1,5-naphthalene diisocyanate (1,5-naphthalene diisocyanate), 4-methoxy-1,3-phenylene diisocyanate (4-methoxy-1,3-phenylene diisocyanate), 4-chloro-1, 3-phenylene diisocyanate (4-chloro-1,3-phenylene diisocyanate), 2,4-dimethyl-1,3-phenylene diisocyanate (2,4-dimethyl-1,3-phenylene diisocyanate), diphenyl Ether-4,4'-diisocyanate (diphenyl ether-4,4'-diisocyanate), 4,4'-dibenzyl diisocyanate (4,4'-dibenzyl diisocyanate), methylenebis (4-phenyl isocyanate) (methylenebis (4-phenyl isocyanate)), 1,3-phenylene diisocyanate, hexamethylenediisocyanate, 1,4-tetramethylene diisocyanate, 1,4-tetramethylene diisocyanate, In the group consisting of 1,1-bis (acryloyloxymethyl) ethyl isocyanate (1,1-bis (acryloyloxymethyl) ethyl isocyanate), 2-methacryloyloxyethyl isocyanate (2-methacryloyloxyethyl isocyanate), and combinations thereof Uh chosen It can be one.

(a) The urethane acrylate oligomer constitutes the basic structure of the resin composition forming the pattern layer 280, and affects the adhesiveness and physical properties of the resin composition. When the urethane acrylate oligomer is bonded to the substrate 100 and then cured, volume shrinkage occurs less, thereby improving surface roughness. In addition, the urethane acrylate oligomer improves adhesion, so that even if the substrate 100 is made of various materials, it may have adhesion.

The (b) monomer having a double bond may include a monomer having a chain structure. In addition, a monomer having a cyclic structure may be included. The monomer may be one type of monomer, or may be a mixture of two or more types.

The monomer having the chain structure is 1,4-butanediol dimethacrylate, dimethylaminoethyl methacrylate, 2-ethylhexyl methacrylate, iso Iso-decyl methacrylate, glycidyl methacrylate, n-butyl methacrylate, 2-phenylethyl methacrylate, hexyl Methacrylate (hexyl methacrylate), decyl methacrylate (decyl methacrylate), 1,6-hexanediol dimethacrylate (1,6-hexanediol dimethacrylate), ethoxylate bisphenol-A dimethacrylate (ethoxylated bisphenol- A dimethacrylate), t-butylaminoethyl methacrylate, isoamyl methacrylate, isobutyl methacrylate, diethylene glycol dimethacrylate ), triethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, and a combination thereof.

In addition, the monomer having a cyclic structure is dicyclopentanyl methacrylate, ethylene glycol dicyclopentenyl ether methacrylate, 2-methylcyclohexyl methacrylate. ), dicyclopentenyl ether methacrylate, isobornyl ethoxy methacrylate, tetrahydrofurfuryl methacrylate, tetrahydrofurfuran-3-yl methacrylate It may be any one selected from the group consisting of acrylate (tetrahydrofurfuran-3-yl methacrylate), isobornyl methacrylate, furfuryl methacrylate, and combinations thereof.

The monomer having the chain structure included in the (b) monomer having a double bond has a wetting property for the substrate 100 and a filling property for a mold pattern. In addition, the pattern layer 280 made of the resin composition causes volume shrinkage to occur less, and viscosity control is possible. In addition, the (b) monomer having a cyclic structure included in the monomer having a double bond prevents volume shrinkage hardly occur when the resin composition is cured, makes volume shrinkage less, and allows viscosity control.

The (c) photopolymerization initiator enables the resin composition to be photocured. The (c) photopolymerization initiator may be used by mixing one type or two or more types of photopolymerization initiators, and when using two or more types of photopolymerization initiators, short-wavelength and long-wavelength initiators are suitably mixed and used. In this case, the wavelength band of the (c) photopolymerization initiator used may be adjusted by the material of the substrate 100.

For example, the (c) photopolymerization initiator is 2-hydroxy-2-methyl-1-phenylpropan-1-one (2-hydroxy-2-methyl-1-phenylpropan-1-one, Darocur 1173, Ciba Company), 2,2-dimethoxy-1,2-diphenylethan-1-one (2,2-dimethoxy-1,2-diphenylethan-1-one, Irgacure 651, Ciba company), 1-hydroxy- Cyclohexylphenylketone (1-hydroxycyclohexylphenylketone, Irgacure 184, Ciba company), 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)propan-1-one (2-methyl -1-[4-(methylthio)phenyl]-2-(4-morpholinylpropan-1-one, Irgacure 907, Ciba company), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (bis(2 ,4,6-trimethylbenzoyl)-phenylphosphine oxide, Irgacure 819, Ciba company), 2,4,6-trimethylbenzoyldiphenylphosphine oxide (2,4,6-trimethylbenzoyldiphenylphosphine oxide, Darocur TPO, Ciba company) and their It may include any one selected from the group consisting of combinations, but is not limited thereto.

The (d) curing accelerator also serves as an adhesion promoter, and contributes to enhancing the curing density, curing speed, and adhesion to the substrate of the resin composition. The (d) curing accelerator may be a polyfunctional acrylate having three or more functional groups.

For example, the (d) curing accelerator is trimethylolpropane triacrylate, glycerin propoxylated triacrylate, pentaerythritol triacrylate, dimethylolpropane tetraacryl Selected from the group consisting of dimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexa(meth)acrylate, and combinations thereof Any one of which can be used, but is not limited thereto.

In particular, a resin composition containing dendritic acrylate represented by the following formula (4) as the (d) curing accelerator has a very high curing speed. The reason is that the general polyfunctional acrylate has a viscosity of 10,000 cPs or more at 25°C, whereas the dendritic acrylate represented by the following Formula 4 has a viscosity of about 500 cPs at 25°C.

[Formula 4]

The a, b, c, and d are integers selected from 0 to 5, and a + b + c + d = 5.

The (e) other additives may include any one selected from the group consisting of an antifoaming agent, a wetting agent, a dispersing agent, a rheological additive, and combinations thereof, if necessary.

The resin composition constituting the pattern layer 280 includes (a) 10 to 65% by weight of a urethane acrylate oligomer, (b) 20 to 90% by weight of a monomer having a double bond, (c) 0.1 to 10% by weight of a photopolymerization initiator, and ( d) 3 to 10% by weight of a curing accelerator may be included. In addition, the resin composition may further include 0.5 to 10% by weight of (e) other additives.

When the resin composition contains less than 10% by weight of (a) urethane acrylate oligomer, the adhesive strength of the composition decreases, and it may be difficult to maintain the shape of the pattern layer 280. That is, after the pattern layer 280 is coated on the substrate 100, it is difficult to maintain the shape and may be separated. (a) When the urethane acrylate oligomer is included in an amount exceeding 65% by weight, the viscosity of the composition increases, and the curing speed may decrease. For this reason, the (a) urethane acrylate oligomer may be included in an amount of 10 to 65% by weight, preferably 25 to 60% by weight.

In the case of containing less than 20% by weight of (b) a monomer having a double bond in the resin composition, it is difficult to control the viscosity of the composition low, and if it contains more than 90% by weight, the shape of the pattern layer 280 is maintained. Can be difficult. For this reason, the (b) monomer having a double bond is preferably contained in an amount of 20 to 90% by weight.

In the case of containing less than 0.1% by weight of the (c) photopolymerization initiator in the resin composition, the degree of polymerization may decrease when the pattern layer 280 is cured, and if it contains more than 10% by weight, the adhesiveness decreases and the pattern layer ( There is a concern that the 280 may be separated from the substrate 100. For this reason, the (c) photopolymerization initiator is preferably contained in an amount of 0.1 to 10% by weight.

If the resin composition contains less than 3% by weight of the (d) curing accelerator, the curing density is small during curing of the composition, so there is a concern that the adhesion and mechanical strength of the pattern layer 280 may decrease, and exceeding 10% by weight If included, it may be difficult to maintain the shape of the cured film obtained from the composition. For this reason, the (d) curing accelerator is preferably contained in an amount of 3 to 10% by weight.

The resin composition includes (a) a urethane acrylate oligomer, (b) a monomer having a double bond, (c) a photopolymerization initiator and (d) a curing accelerator, and if necessary, (e) other additives are added. , Mixing using a stirrer at room temperature, or obtained by mixing using a paste mixer (paste mixer), but is not limited thereto.

The resin composition improves the adhesiveness of the pattern layer 280 so that the pattern layer 280 can have adhesiveness even if the substrate 100 is made of various materials. For example, even if the substrate 100 has a retardation difference of less than 0.2% according to the incident angle of light in the substrate 100, the pattern layer 280 has adhesiveness to the substrate 100. I can. In addition, for example, the substrate 100 is selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC), poly(methyl methacrylate) (PMMA), cyclic olefin copolymer (COC), and cyclic olefin polymer (COP). The pattern layer 280 may have adhesiveness to the substrate 100 regardless of which one is formed.

Conventional photocurable resins have a problem in that the volume shrinkage is large and the curing density is smaller than that of other types of resins, so that adhesion to the substrate 100 is insufficient, and defects occur in the process of separating from the mold. In addition, the substrate 100 may be formed of a variety of materials, and there is a difficulty in using different resins depending on the material of the substrate 100.

However, the resin composition according to the present invention has low volumetric shrinkage, high curing density, and has adhesion properties with various materials. In particular, in the case of a photoisotropic film, it is a non-adhesive material, and conventional photocurable resins have a problem in that it is difficult to adhere to a photoisotropic film, but the resin composition according to the present invention can also be bonded to a non-adhesive material such as a photoisotropic film. That is, the substrate 100 is photoisotropic, such as, for example, cyclic olefin copolymer (COC), cyclic olefin polymer (COP), polycarbonate (PC) and photoisotropic polymethyl methacrylate (PMMA). Even if made of a film, the pattern layer 280 made of the resin composition according to the present invention may have adhesiveness to the substrate 100.

The pattern layer 280 may include a first sub-pattern 281 and a second sub-pattern 282. In this case, the first sub-pattern 281 is disposed on the mesh line part LA. Accordingly, the first sub-pattern 281 is arranged in a mesh shape. The first sub-pattern 281 may be embossed.

The second sub-pattern 282 is disposed on the substrate 100. The second sub-pattern 282 is disposed in the mesh opening OA. Accordingly, the second sub-pattern 282 may be disposed between the first sub-pattern 281. The second sub-pattern 282 may be embossed.

The first sub-pattern 281 and the second sub-pattern 282 may be formed by placing a mold on the upper portion of the resin composition and then imprinting the resin composition on the substrate 100. In the drawings, the first sub-pattern 281 and the second sub-pattern 282 are expressed as angled protrusions, but the present invention is not limited thereto, and the shape of the protrusion may be variously formed as necessary.

The pattern layer 280 formed of the resin composition has excellent filling properties in the mold pattern when the first sub-pattern 281 and the second sub-pattern 282 are formed by an imprinting process using a mold. The adhesion with (100) is also excellent. Accordingly, defects of the first sub-pattern 281 can be prevented, and the electrode layer 270 formed thereon can also be formed without damage. Accordingly, disconnection of the electrode layer 270 can be prevented and reliability can be improved.

The electrode layer 270 is disposed on the first sub-pattern 281. The electrode layer 270 may be entirely disposed on the first sub-pattern 281. That is, the electrode layer 270 may be disposed surrounding the first sub-pattern 281.

The electrode layer 270 is disposed on the mesh line LA, and the electrode layer 270 is disposed in a mesh shape. The electrode layer 270 may include various metals having excellent electrical conductivity. For example, the electrode layer 270 may include Cu, Au, Ag, Al, Ti, Ni, or an alloy thereof.

Subsequently, the wiring 300 is formed in the non-effective area UA. The wiring 300 may apply an electric signal to the electrode part 200. The wiring 300 may be formed in the non-effective area UA to be invisible.

Meanwhile, although not shown in the drawing, a circuit board connected to the wiring 300 may be further positioned. Various types of printed circuit boards may be applied as the circuit board, and for example, a flexible printed circuit board (FPCB) may be applied.

Next, a touch window according to a second embodiment will be described with reference to FIG. 5. 5 is a cross-sectional view of a touch window according to a second embodiment. A description redundantly with the first embodiment may be omitted.

Referring to FIG. 5, a substrate 100 is provided in which an effective area and an inactive area disposed around the effective area are defined. An electrode part 200 is formed in the effective area of the substrate 100. The electrode part 200 may include a pattern layer 280 and an electrode layer 270. In this case, the pattern layer 280 may include an intaglio portion 283 and a relief portion 284.

A difference in retardation according to an incident angle of light in the substrate 100 may be less than 0.2%. Specifically, the retardation difference according to the incident angle of light within the substrate 100 may be 0.001% to 0.2%. The retardation according to the incident angle of light in the substrate 100 may be greater than 0 nm and less than 5 nm. The refractive index is the same in any direction such as the surface direction or the thickness direction of the substrate 100. Further, the water absorption of the substrate 100 is greater than 0% and less than or equal to 0.1%.

In addition, the wavelength dispersion of the substrate 100 at 400 nm/550 nm to 700 nm/550 nm is 0.9 to 1.1. Preferably, the wavelength dispersion of the substrate 100 at 400 nm to 700 nm is 1.0 to 1.05. In addition, the wavelength dispersion of the substrate 100 is uniform anywhere.

The substrate 100 may include a photoisotropic film. For example, the substrate 100 may include Cyclic Olefin Copolymer (COC), Cyclic Olefin Polymer (COP), photoisotropic polycarbonate (PC), or photoisotropic polymethylmethacrylate (PMMA).

Accordingly, the touch window according to the present invention can improve a moire phenomenon, a blackout phenomenon (a phenomenon in which the screen looks black at a specific angle), and a rainbow phenomenon (a rainbow stain). That is, visibility can be improved. In addition, even when exposed to an environment with high humidity, moisture absorption in the touch window can be prevented, thereby improving reliability and durability.

That is, the electrode part 200 is disposed on the substrate 100, and moisture absorption of the electrode part 200 may be prevented. Adhesion to the electrode part 200 disposed on the substrate 100 may be improved. Therefore, even if the electrode part 200 includes any material, it may be stably formed without peeling or film removal from the substrate 100.

The pattern layer 280 is disposed on the substrate 100. The pattern layer 280 may be formed of a photocurable resin. In this case, the pattern layer 280 may be formed of the resin composition according to the embodiment.

The resin composition according to the embodiment may include (a) a urethane acrylate oligomer, (b) a monomer having a double bond, (c) a photopolymerization initiator, and (d) a curing accelerator. In addition, the resin composition may further include (e) other additives. The resin composition may be the same as the resin composition forming the pattern layer 280 of the touch window according to the first embodiment.

The resin composition constituting the pattern layer 280 includes (a) 10 to 65% by weight of a urethane acrylate oligomer, (b) 20 to 90% by weight of a monomer having a double bond, (c) 0.1 to 10% by weight of a photopolymerization initiator, and ( d) 3 to 10% by weight of a curing accelerator may be included. In addition, the resin composition may further include 0.5 to 10% by weight of (e) other additives.

The (a) urethane acrylate oligomer may be composed of polyol and isocyanate. The (a) urethane acrylate oligomer is composed of an acrylic group or a methacrylic group.

The polyol may be any one selected from the group consisting of polycarbonate polyol, polycaprolactone polyol, and combinations thereof. For example, at least one of the repeating units represented by the following Chemical Formulas 1 and 2 may be included.

[Formula 1]

The l, m, and n are integers selected from 1 to 30.

[Formula 2]

The p and q are integers selected from 1 to 50.

The polyol may further include a repeating unit represented by Formula 3 below in addition to the repeating unit represented by Formula 1 and Formula 2.

[Formula 3]

R is an integer selected from 0 to 30. Including the repeating unit represented by Formula 3, the molecular weight of the urethane acrylate oligomer may be controlled, and compatibility and mechanical properties may be controlled. In addition, in order to include the repeating unit represented by Chemical Formula 3, ethylene oxide may be added as needed.

The polyol includes any one selected from the group consisting of polycarbonate polyol, polycaprolactone polyol, and combinations thereof, and includes a polyol having a linear structure, a polyol having a cyclic structure, and a combination thereof It may further include any one selected from the group consisting of.

The isocyanate may be a cyclic or linear isocyanate having two or more functional groups.

The (b) monomer having a double bond may include a monomer having a chain structure. In addition, a monomer having a cyclic structure may be included. The monomer may be one type of monomer, or may be a mixture of two or more types.

The (c) photopolymerization initiator enables the resin composition to be photocured. The (c) photopolymerization initiator may be used by mixing one type or two or more types of photopolymerization initiators, and when using two or more types of photopolymerization initiators, short-wavelength and long-wavelength initiators are suitably mixed and used. In this case, the wavelength band of the (c) photopolymerization initiator used may be adjusted by the material of the substrate 100.

The (d) curing accelerator also serves as an adhesion promoter, and contributes to enhancing the curing density, curing speed, and adhesion to the substrate of the resin composition. The (d) curing accelerator may be a polyfunctional acrylate having three or more functional groups.

The (e) other additives may include any one selected from the group consisting of an antifoaming agent, a wetting agent, a dispersing agent, a rheological additive, and combinations thereof, if necessary.

The resin composition according to the present invention has low volumetric shrinkage, high curing density, and has adhesion properties with various materials. Thus, the substrate 100 is, for example, a light such as COC (Cyclic Olefin Copolymer), COP (Cyclic Olefin Polymer), photoisotropic polycarbonate (PC), and photoisotropic polymethylmethacrylate (PMMA). Even if it is made of an isotropic film, it may have adhesiveness.

The pattern layer 280 formed of the resin composition may include an intaglio portion 283 and a relief portion 284. The intaglio portion 283 may be formed through an imprinting process. That is, the concave portion 283 may be formed by placing a mold on the upper portion of the resin composition coated on the substrate 100 and imprinting the resin composition. When the pattern layer 280 formed of the resin composition is formed by an imprinting process using a mold, the concave portion 283 and the convex portion 284 are excellent in filling properties in the mold pattern, and The adhesion is also excellent.

The electrode layer 270 may be disposed in the concave portion 283. That is, the electrode layer 270 may be formed by filling the sensing electrode material in the intaglio portion 283. Accordingly, compared to the existing deposition and photolithography processes, the number of processes, process time, and process cost can be reduced.

The embossed portion 284 may be disposed between the engraved portion 283 and the adjacent engraved portion 283. The embossed portion 284 may be formed at the same time when the engraved portion 283 is formed. In the drawings, the embossed portion 284 is expressed as an angled protrusion, but the present invention is not limited thereto, and the shape of the protrusion may be variously formed as necessary.

The sensing electrode material forming the electrode layer 270 may be filled while the doctor knife moves in contact with the pattern layer 280. The electrode layer 270 may include a binder and conductive particles dispersed in the binder.

The binder may be an organic binder. The binder may be included in 5% to 15% by weight based on the total weight of the electrode layer 270. When the binder is included in an amount of 5% by weight or more with respect to the total weight of the electrode layer 270, adhesion of the electrode layer 270 may be improved. In addition, when the binder is included in an amount of 15% by weight or less based on the total weight of the electrode layer 270, it is possible to maintain an appropriate viscosity of the electrode material during the printing process.

The conductive particles are dispersed in the binder. The conductive particles are uniformly dispersed in the binder, thereby improving the uniformity of the electrode layer 270. The conductive particles may include Cu, Au, Ag, Al, Ti, Ni, or alloys thereof.

The electrode layer 270 is disposed in a mesh shape. The mesh shape can be formed randomly to prevent moire phenomenon. Specifically, the electrode part 200 includes a mesh opening OA and a mesh line LA. In this case, the concave portion 283 may be disposed in the mesh line portion LA, and the concave portion 284 may be disposed in the mesh opening portion OA. The shape of the electrode part 200 and the shape of the mesh opening OA may be formed to have various shapes.

Hereinafter, the present invention will be described in more detail through examples and experimental results of the resin composition according to the present invention, but the embodiments of the present invention can be modified in various forms, and the scope of the present invention is due to the embodiments described below. It should not be construed as limited.

Example

In a flask equipped with a nitrogen inlet, 14 parts by weight of a polyol having l = 1, m = 1, and n = 1 in the following formula (5) and 31.5 parts by weight of a polyol having p = 1, q = 1 in the formula (6) and methylene-bis (4 -After adding 23.5 parts by weight of cyclohexyl isocyanate), the temperature of the flask was raised to 70? and maintained for 2 hours.

[Formula 5]

[Formula 6]

Then, 16 parts by weight of methacrylate was added to synthesize a urethane acrylate oligomer. After synthesizing the urethane acrylate oligomer, in order to adjust the viscosity of the solution containing the urethane acrylate oligomer, 29 parts by weight of isobornyl acrylate was added to finally obtain a solution containing the urethane acrylate oligomer.

In 28% by weight of the urethane acrylate oligomer (the content of the urethane acrylate oligomer in the solution containing the urethane acrylate oligomer), 60% by weight of dicyclopentanyl methacrylate as a monomer having a double bond, Darocur of Ciba as a photoinitiator 1173 5% by weight and 7% by weight of dendritic acrylate represented by the following formula (4) were added as a curing accelerator, followed by stirring at room temperature for 0.5 hours to obtain a photocurable resin composition.

[Formula 4]

The a, b, c, and d are integers selected from 0 to 5, and a + b + c + d = 5.

Comparative example One

In Examples, 1,4-butanediol was used instead of the polyols of Formulas 1 and 2, and the isocyanate contained in the urethane acrylate oligomer was used as 1,4-tetramethylene diisocyanate, which is a linear isocyanate. A photocurable resin composition was obtained in the same manner as in Examples except for using.

Comparative example 2

In Examples, 1,6-hexanediol diacrylate was used instead of the dendritic acrylate represented by Formula 4, and the isocyanate contained in the urethane acrylate oligomer was used as an isocyanate having a linear structure. A photocurable resin composition was obtained in the same manner as in Example except that, 4-tetramethylene diisocyanate (1,4-tetramethylene diisocyanate) was used.

Experimental example -Adhesion evaluation

The photocurable resin compositions obtained by Examples, Comparative Examples 1 and 2 were applied to a substrate of cyclic olefin polymer (COP), cyclic olefin copolymer (COC), polycarbonate (PC), and poly(methyl methacrylate) (PMMA), and It cured to obtain a cured film of 20 μm.

After performing a pressure cooker test (120?, 100% humidity, 4 hours) by the method according to ASTM D3359, it was peeled off using a 3M 610 tape. The film removal ratio of the Experimental Example, Comparative Example 1 and Comparative Example 2 was measured and described in Table 1.

COP COC PC PMMA Example 5B 5B 5B 5B Comparative Example 1 0B 3B 0B 2B Comparative Example 2 0B 1B 0B 0B

5B has a film removal ratio of 0%, 4B has a film removal ratio of 5% or less, 3B has a film removal ratio of 5-15%, 2B has a film removal ratio of 15-35%, 1B has a film removal ratio of 35-65%, and 0B is a film removal ratio. This means that the percentage exceeds 65%.

From Table 1, it was confirmed that the cured film obtained from the photocurable resin composition of the Example had excellent adhesion to all of the COP, COC, PC, and PMMA substrates.

However, from Table 1, in the case of Comparative Example 1, it was confirmed that adhesion to the COC and PMMA substrates was shown to some extent, but there was little adhesion to the COP and PC substrates. In addition, it was confirmed that the COC and PMMA substrates have lower adhesion than the examples. In addition, Comparative Example 2 showed a weak adhesion to the COC substrate with a film removal rate exceeding 35%, it was confirmed that there is little adhesion to the COP, PC and PMMA substrates.

Through the above experimental examples, it was confirmed that the photocurable resin composition according to the present invention not only has strong adhesive strength, but also can form patterns on various substrates. Accordingly, it was confirmed that the pattern layer of the present invention including the resin composition has adhesive strength even if the substrate is formed of a non-adhesive material.

Features, structures, effects, and the like described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Accordingly, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention pertains are illustrated above within the scope not departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications that are not available are possible. For example, each component specifically shown in the embodiments can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: substrate
200: electrode part
270: electrode layer
280: pattern layer

Claims (17)

Board; And
Including an electrode portion formed of a pattern layer and an electrode layer disposed on the substrate,
The pattern layer is a urethane acrylate oligomer comprising any one selected from the group consisting of (a) polycarbonate polyol, polycaprolactone polyol, and combinations thereof, (b ) A monomer having a double bond, (c) a photopolymerization initiator, and (d) a photocurable resin composition comprising a curing accelerator,
The retardation difference according to the incident angle of light in the substrate is less than 0.2%,
The water absorption of the substrate is 0.1% or less,
The substrate has a wavelength dispersion of 0.9 to 1.1 at 400 nm/550 nm to 700 nm/550 nm,
The electrode portion touch window having a mesh shape including a mesh line portion and a mesh opening. The method of claim 1,
The (a) urethane acrylate oligomer comprises at least one of the repeating units represented by the following Chemical Formulas 1 and 2;
[Formula 1]

The l, m, and n are integers selected from 1 to 30.
[Formula 2]

The p and q are integers selected from 1 to 50. The method of claim 1,
The (a) urethane acrylate oligomer further comprises any one selected from the group consisting of a polyol having a linear structure, a polyol having a cyclic structure, and a combination thereof. The method of claim 1,
The (a) urethane acrylate oligomer further comprises a cyclic or linear isocyanate having two or more functional groups. The method of claim 1,
The (b) monomer having a double bond is 1,4-butanediol dimethacrylate, dimethylaminoethyl methacrylate, and 2-ethylhexyl methacrylate. ), iso-decyl methacrylate, glycidyl methacrylate, n-butyl methacrylate, 2-phenylethyl methacrylate ), hexyl methacrylate, decyl methacrylate, 1,6-hexanediol dimethacrylate, ethoxylate bisphenol-A dimethacrylate ( ethoxylated bisphenol-A dimethacrylate), t-butylaminoethyl methacrylate, isoamyl methacrylate, isobutyl methacrylate, diethylene glycol dimethacrylate ( diethylene glycol dimethacrylate), triethylene glycol dimethacrylate (triethylene glycol dimethacrylate), 1,3-butanediol dimethacrylate (1,3-butanediol dimethacrylate), characterized in that any one selected from the group consisting of a combination thereof Touch window. The method of claim 1,
The (b) monomer having a double bond is dicyclopentanyl methacrylate, ethylene glycol dicyclopentenyl ether methacrylate, and 2-methylcyclohexyl methacrylate. methacrylate), dicyclopentenyl ether methacrylate, isobornyl ethoxy methacrylate, tetrahydrofurfuryl methacrylate, tetrahydrofurfuran-3-yl Methacrylate (tetrahydrofurfuran-3-yl methacrylate), isobornyl methacrylate (isobornyl methacrylate), furfuryl methacrylate (furfuryl methacrylate), characterized in comprising any one selected from the group consisting of a combination thereof Touch windows. The method of claim 1,
The (c) photopolymerization initiator is 2-hydroxy-2-methyl-1-phenylpropan-1-one (2-hydroxy-2-methyl-1-phenylpropan-1-one), 2,2-dimethoxy-1 ,2-diphenylethan-1-one (2,2-dimethoxy-1,2-diphenylethan-1-one), 1-hydroxy-cyclohexylphenylketone, 2-methyl-1-[ 4-(methylthio)phenyl]-2-(4-morpholinyl)propan-1-one (2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinylpropan-1-one) , Bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide), 2,4,6-trimethylbenzoyldiphenylphosphine oxide (2,4 ,6-trimethylbenzoyldiphenylphosphine oxide) and a touch window, characterized in that any one selected from the group consisting of a combination thereof. The method of claim 1,
The (d) curing accelerator is trimethylolpropane triacrylate, glycerin propoxylated triacrylate, pentaerythritol triacrylate, dimethylolpropane tetraacrylate. ), pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexa(meth)acrylate, dendritic acrylate represented by the following Chemical Formula 4, and Touch window, characterized in that any one selected from the group consisting of a combination of these:
[Formula 4]

The a, b, c, and d are integers selected from 0 to 5, and a + b + c + d = 5. The method of claim 1,
The resin composition constituting the pattern layer further comprises (e) an antifoaming agent, a wetting agent, a dispersing agent, a rheological additive, and any other additive selected from the group consisting of a combination thereof. delete The method of claim 1,
The pattern layer includes a first sub-pattern and a second sub-pattern disposed adjacent to the first sub-pattern,
The electrode layer is a touch window, characterized in that disposed on the first sub-pattern of the pattern layer. The method of claim 1,
The pattern layer includes an intaglio portion and a relief portion,
The electrode layer is a touch window, characterized in that disposed on the intaglio portion of the pattern layer. The method of claim 1,
A touch window, wherein a retardation according to an incident angle of light in the substrate is 5 nm or less. delete delete The method of claim 1,
The substrate is a touch window, characterized in that the photoisotropic film. The method of claim 1,
The substrate is a touch window comprising any one selected from the group consisting of COC (Cyclic Olefin Copolymer), COP (Cyclic Olefin Polymer), photoisotropic polycarbonate (PC), and photoisotropic polymethyl methacrylate (PMMA) .

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