KR101764220B1 - Conductive composition for nano imprint, and method for manufacturing touch panel using the same - Google Patents

Abstract

The conductive composition for a nanoimprint according to the present invention comprises conductive particles comprising metal particles surface-coated with a saturated fatty acid; Binder resin; Curing agent; And a solvent.

Description

TECHNICAL FIELD The present invention relates to a conductive composition for a nanoimprint, a method for manufacturing the same, and a manufacturing method of a touch panel using the same.

The present invention relates to a conductive composition for a nanoimprint, a method of manufacturing the same, and a method of manufacturing a touch panel using the same. More particularly, the present invention relates to a conductive composition for a nanoimprint improved in composition and a method of manufacturing a touch panel using the same.

2. Description of the Related Art In recent years, a touch panel has been applied to various electronic devices such as a display device for convenience of users. The touch panel includes a second conductive film including a first conductive film and a second electrode including a first electrode for touch sensing and a second conductive film formed on the uppermost layer on the front surface of the first conductive film and the second conductive film, A cover glass substrate, and an adhesive layer for bonding them.

When the first conductive film including the first electrode and the second conductive film forming the second electrode are separately formed in the touch panel, the laminated structure of the touch panel may become complex, thick, and heavy. Also, the manufacturing cost of the touch panel is expensive, and the price competitiveness may be deteriorated.

To reduce the number of conductive films, a technique has been proposed in which a first electrode is formed on one conductive film, a part of the second electrode is formed, and a bridge electrode part connecting a part of the second electrode is formed. The bridge electrode portion can be formed by deposition or the like as disclosed in Korean Patent No. 10-1118727, which has a problem that the process time and cost increase.

The present invention provides a conductive composition for a nanoimprint capable of reducing the time and cost of a manufacturing process of a conductive pattern, a method of manufacturing the same, and a manufacturing method of a touch panel using the same.

The conductive composition for a nanoimprint according to the present invention comprises conductive particles comprising metal particles surface-coated with a saturated fatty acid; Binder resin; Curing agent; And a solvent.

The saturated fatty acid may comprise at least one of lauric acid, myristic acid, palmitic acid and stearic acid.

The curing agent may include a latent curing agent.

The latent curing agent may include an amine adduct, and the glass transition temperature of the latent curing agent may be 85 to 105 ° C.

The latent curing agent may be included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the entire conductive composition for nanoimprint.

The latent curing agent may be included in an amount of 0.2 to 1 part by weight based on 100 parts by weight of the entire conductive composition for nanoimprint.

The latent curing agent may be included in an amount of 0.2 to 0.4 parts by weight based on 100 parts by weight of the total conductive composition for nanoimprint.

The binder resin may include an epoxy-based material, and the solvent may include an acetate-based material.

Wherein the metal particles are selected from the group consisting of Ag, Au, Cu, Ni, Pt, Pd, W, Mo, (Pb), tin (Sn), aluminum (Al), and alloys thereof.

The metal particles may include silver (Ag).

The average size of the conductive particles may be 0.05 탆 to 3.0 탆, and the tap density of the conductive particles may be 3.5 g / ml to 5.0 g / ml.

The conductive composition for nanoimprint can be used to form an electrode part of a touch panel.

The method for preparing a conductive composition for a nanoimprint according to the present invention comprises the steps of: forming a conductive particle comprising metal particles surface-coated with a saturated fatty acid by surface-coating metal particles with a saturated fatty acid; And mixing the conductive particles, the binder resin, the curing agent, and the solvent.

A method of manufacturing a touch panel according to the present invention is a method of manufacturing a touch panel using a nanoimprinting conductive composition for a nanoimprint including conductive particles containing metal particles surface-coated with a saturated fatty acid, a binder resin, a curing agent, And forming an electrode portion.

The electrode portion may be a wiring portion of the touch panel.

Forming a first sensor portion including a first sensor portion and a first connection portion on the base film and a second sensor portion before forming the electrode portion; And forming an insulating layer on the first connection portion. The forming of the electrode portion may form a second connecting portion connecting the second sensor portion on the insulating layer.

The conductive composition for a nanoimprint according to the present invention can improve the filling property of the conductive composition for a nanoimprint and the electrical conductivity of a conductive pattern by including conductive particles including metal particles surface-coated with a saturated fatty acid. It is also possible to control the peeling property of the dry film resist including the curing agent (for example, a latent curing agent) and improve the reliability. By using an acetate-based material as a solvent, it is possible to improve workability, filling property, adhesion property, and the like of a conductive material for a nanoimprint.

If a conductive composition for a nanoimprint according to the present invention is used, various conductive patterns (for example, a wiring portion of a touch panel or a bridge electrode portion) can be easily formed by a nanoimprint process. Thus, the manufacturing method of a device including a conductive pattern (for example, a touch panel) can be simplified to reduce the processing time and cost, and realize a fine conductive pattern.

1 is a schematic plan view of a touch panel according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it is needless to say that the present invention is not limited to these embodiments and can be modified into various forms.

In the drawings, the same reference numerals are used for the same or similar parts throughout the specification. In the drawings, the thickness, the width, and the like are enlarged or reduced in order to make the description more clear, and the thickness, width, etc. of the present invention are not limited to those shown in the drawings.

Wherever certain parts of the specification are referred to as "comprising ", the description does not exclude other parts and may include other parts, unless specifically stated otherwise. Also, when a portion of a layer, film, region, plate, or the like is referred to as being "on" another portion, it also includes the case where another portion is located in the middle as well as the other portion. When a portion of a layer, film, region, plate, or the like is referred to as being "directly on" another portion, it means that no other portion is located in the middle.

Hereinafter, a conductive composition for a nanoimprint according to an embodiment of the present invention, a method of manufacturing the same, and a method of manufacturing a touch panel using the same will be described in detail with reference to the accompanying drawings. Hereinafter, an example of a touch panel to which a conductive composition for a nanoimprint and a method of manufacturing a touch panel according to the present invention can be applied will be described, followed by a conductive composition for a nanoimprint according to the present invention, a method for manufacturing the same, .

1 is a schematic plan view of a touch panel according to an embodiment of the present invention.

Referring to FIG. 1, the touch panel 100 of the present embodiment includes first and second electrodes 14 and 24 to sense a touch of an input device such as a user's hand, stylus pen, or the like. At this time, the first electrode 14 and the second electrode 24 are positioned together on one side of the same conductive film 110, so that the structure of the touch panel 100 can be simplified.

The conductive film 110 includes a base film 112 and first and second electrodes 14 and 24 spaced from one another on one side of the base film 112.

The base film 112 may be a film, sheet, or the like, which is made of a material having translucency and insulation while maintaining the mechanical strength of the conductive film 110. The base film 112 may be composed of polyethylene terephthalate or the like. However, the present invention is not limited thereto, and various materials other than the above-mentioned materials may be used for the base film 112.

The first electrode 14 and the second electrode 24 are positioned on one side of the base film 112 and the first electrode 14 and a part of the second electrode 24 are on the same plane And may be made of the same material with the same material. And the other part of the second electrode 24 is located on the first electrode 14 and a part of the above-described second electrode 24 and another layer (for example, the insulating layer 119) ), And a part of the second electrode 24 described above. This will be explained in more detail.

The first electrode 14 includes a plurality of first sensor portions 142a and a first connecting portion 142b connecting the plurality of first sensor portions 142a in a first direction A first sensor part 142 located within the effective area AA including the first wiring part 144 and a first wiring part 144 located in the ineffective area NA. The second electrode 24 includes a plurality of second sensor portions 242a and a plurality of second sensor portions 242a in a second direction crossing the first direction A second sensor portion 242 located within the effective region AA and including a second connecting portion (or bridge electrode portion) 242b connecting the first wiring portion Section 244.

The first and second sensor portions 142a and 242a are substantially larger in width than the first and second connecting portions 142b and 242b to substantially sense whether an input device such as a finger is contacted. In the drawing, the first and second sensor portions 142a and 242a have a rhombic shape and are formed in a large area, so that the touch can be effectively sensed. However, the present invention is not limited thereto, and the first and second sensor portions 142a and 242a may have various shapes such as a triangle, a polygon such as a quadrangle, a circle or an ellipse.

Here, the first sensor portion 142a, the first connecting portion 142b, and the second connecting portion 242a may be formed by patterning the same layer including the same material on the same plane on the base film 112 have. The first sensor portion 142a and the first connection portion 142b integrally formed on the same plane are physically and electrically connected to each other. Thus, the first electrode 14 can be positioned in the first direction in the effective area AA. The plurality of second connection portions 242a may be spaced apart from each other at portions located on the same plane as the first sensor portion 142a and the second connection portion 14b to have an island shape. The insulating layer 119 is partially located on the first connecting portion 142b and the second connecting portion 242b is extended on the insulating layer 119 to the second connecting portion 242a located on both sides in the second direction . Then, the second connecting portions 242a spaced apart from each other can be connected to each other in the second direction by the second connecting portions 242b. In this way, the second electrode 24 can be positioned in the second direction in the effective area AA.

In this embodiment, the first sensor portion 142 and the second sensor portion 242a include a transparent conductive material having conductivity and transparency. For example, the first sensor portion 142 and the second sensor portion 242a may include a transparent conductive oxide (TCO) such as indium-tin oxide and the like.

The insulating layer 119 may be partially located to correspond to each first connection portion 142b in a one-to-one correspondence with covering the first connection portion 142b. The insulating layer 119 may be composed of various insulating materials capable of maintaining insulation.

The second connection portion 242b in the second direction can be formed across the insulating layer 119 with a greater length than the insulating layer 119. [ The width of the second connection portion 242b in the first direction may be equal to or less than the width of the insulating layer 119. In particular, the width of the second connection portion 242b may be smaller than the width of the insulating layer 119. [ This can prevent the second connection portion 242b from connecting the first sensor portion 142a in the first direction. The second connection portion 242b may include a metal, unlike the first sensor portion 142 and the first connection portion 242a. At this time, the second connection portion 242b may be formed by nano-imprinting the conductive composition for a nanoimprint according to the present invention, which will be described in detail later.

The first and second wiring portions 144 and 244 may include a metal so as to have excellent electrical conductivity. The first and second wiring portions 144 and 244 may be formed by nano-imprinting the conductive composition for nanoimprint according to the present invention, which will be described later in more detail. First and second flexible printed circuit boards 19 and 29 connected to external circuits may be connected to the first and second wiring units 144 and 244, respectively.

The touch panel 100 may further include a cover substrate made of an optical transparent adhesive layer (OCA), glass, or the like in addition to the conductive film 110 including the first and second electrodes 24. Various known materials, structures, and the like can be applied, so that a detailed description thereof will be omitted.

In the touch panel 100 according to the present embodiment, the first sensor portion 142a, the first connection portion 142b, and the second connection portion 242a may be formed of the same layer to have a simple structure. And the second connection portion 242b may be formed on the partially formed insulating layer 119 to connect the second sensor portion 242a.

Hereinafter, the conductive composition for a nanoimprint, which can be used for forming the second connection portion 242b and / or the wiring portions 144 and 244 of the touch panel 100 by nano-imprinting in the present embodiment, Explain.

The conductive composition for a nanoimprint according to the present invention comprises conductive particles comprising metal particles surface-coated with a saturated fatty acid, a binder resin, a curing agent, and a solvent. Such a conductive composition may have the form of a conductive paste composition.

The conductive particles may be composed of metal particles surface-coated (or surface-treated) with saturated fatty acids.

More specifically, the metal particles may be selected from the group consisting of Ag, Au, Cu, Ni, Pt, Pd, W, Mo, Ru, lead (Pb), tin (Sn), aluminum (Al), and alloys thereof. As the saturated fatty acid, lauric acid, myristic acid, palmitic acid, stearic acid and the like can be used. The metal particles may be added to the saturated fatty acid solution and stirred to form the metal particles surface-coated with the saturated fatty acid. However, the present invention is not limited thereto, and various methods can be applied.

For example, silver (Ag) having high electrical conductivity and excellent room temperature stability can be used as the metal particles. That is, as the conductive particles, silver (Ag) particles coated with a saturated fatty acid can be used.

When the metal particles surface-coated with the saturated fatty acid are used as the conductive particles, the dispersibility of the metal particles with the epoxy-based resin and the acetate-based solvent is excellent, and the filling and adhesion properties of the conductive composition for the nanoimprint are excellent.

Such conductive particles may have various shapes such as spherical or non-spherical shapes (plate shape, vertical shape, or flake shape). As the conductive particles, a single particle may be used, or particles having different particle sizes, materials, etc. may be mixed and used.

In this embodiment, the conductive particles may have an average size (for example, an average particle size) of 0.05 mu m to 3.0 mu m. More specifically, it may be 0.1 m to 1.5 m (for example, 0.1 m to 1.0 m). Particularly, the average size of the conductive particles is preferably 0.3 mu m to 0.7 mu m. If the average size is less than 0.05 mu m, the probability of contact between the conductive powders can be reduced. If the average size exceeds 3.0 m, the adhesion to the substrate to which the nanoimprint composition is adhered may be lowered, or the conductive powder may not be densely packed and the conductivity may be lowered. When the average size of the conductive powder is 0.1 mu m or more, the probability of contact between the conductive powders can be further increased. When the average size of the conductive powder is 1.5 占 퐉 or less (for example, 1.0 占 퐉), the filling property can be further improved. When the average size of the conductive particles is 0.3 mu m to 0.7 mu m, the filling characteristics of the conductive particles can be effectively improved. However, the present invention is not limited thereto.

And the tap density of the conductive particles may be from 3.5 g / ml to 5.0 g / ml. If the tap density of the conductive particles is less than 3.5 g / ml, the electric conductivity of the conductive pattern formed with a relatively small amount of the conductive powder per unit volume may be lowered. If the tap density of the conductive particles exceeds 5.0 g / ml, the amount of the conductive powder per unit volume is relatively large, so that the amount of other materials is insufficient and the adhesion characteristics of the conductive pattern may not be excellent. However, the present invention is not limited thereto.

As the binder resin, an epoxy resin can be used. Epoxy resins are excellent in adhesiveness and durability and have no product during curing reaction and can be easily obtained. As the epoxy resin, bisphenol-A type, bisphenol-F type, bromine type, novolac type, alcohol type and the like can be used. The above-mentioned materials may be used alone or in combination of two or more. The weight average molecular weight of the epoxy resin may be from 10,000 to 100,000, for example, from 50,000 to 100,000, and more specifically from 70,000 to 90,000. When such a weight average molecular weight is obtained, the binder resin capable of improving the adhesion property can sufficiently exhibit its role.

The glass transition temperature of the epoxy resin may be 50 캜 to 100 캜. For example, the epoxy-based resin may have a glass transition temperature of 70 캜 to 95 캜, and may be, for example, 70 캜 to 90 캜 or 75 캜 to 95 캜. At this time, if the glass transition temperature of the epoxy resin is lower than the above-mentioned range, the heat resistance may be lowered. It is difficult to raise the glass transition temperature of the epoxy resin to exceed the above range and the adhesion property of the conductive composition for nanoimprint may be low. Particularly, when the epoxy resin has a glass transition temperature of 75 캜 to 85 캜, the adhesion property of the conductive composition for nanoimprint can be improved. However, the present invention is not limited thereto.

The curing agent may serve to cure the conductive composition for the nanoimprint. In the present invention, a latent curing agent may be used as a curing agent in consideration of the storage stability of the conductive composition for nanoimprint.

The latent curing agent may include an amine adduct. Since the amine-based curing agent is dispersed at room temperature in the epoxy resin, the reaction is very slow and the storage stability is excellent. The amine-based curing agent reacts with the epoxy-based resin and hardens when heated above the melting point of the amine.

As the amine-based curing agent, an aliphatic amine-based curing agent, an aromatic amine-based curing agent, a modified polyamine-based curing agent, an imidazole-based curing agent, a dicyandiamide-based curing agent and a block isocyanate-based curing agent can be used. Examples of the aliphatic amine-based curing agent include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and the like. As the aromatic amine series, metaphenylenediamine, diaminodiphenylmethane and the like can be used. As the modified polyamine curing agent, urea-modified polyamine, alkyl-modified dicyandiamide, alkyl-modified imidazole and the like can be used. The curing agent may be a single material or a mixture of two or more materials in consideration of the curing temperature.

The content of the latent curing agent may be determined in consideration of the equivalent amount of the resin composition. For example, the latent curing agent may be contained in an amount of 0.1 to 3 parts by weight, for example, 0.2 to 1 part by weight, based on 100 parts by weight of the total conductive composition for nanoimprint. When the weight of the latent curing agent is less than 0.1 or more than 3, hardening does not sufficiently take place and the conductivity and film strength of the conductive pattern may not be excellent. When the weight ratio of the latent curing agent is 0.2 to 1, the conductivity of the conductive pattern and the film strength can be improved. In particular, the latent curing agent may be included in an amount of 0.2 to 0.4 parts by weight. Then, the peeling property of the dry film resist (DFR) and the reliability of the conductive composition for nanoimprint can be improved at the same time.

The glass transition temperature of the latent curing agent may be 85 [deg.] C to 105 [deg.] C. Having such a glass transition temperature, the latent curing agent can be effectively used.

The solvent can uniformly disperse the conductive particles, the binder resin, and the curing agent. As an example, an acetate-based material may be used as a solvent. Acetate-based materials may include ethyl acetate, butyl carbitol acetate, ethyl carbitol acetate, and the like. When a solvent containing an acetate-based material is used, the workability, filling property, and adhesion property of the conductive composition for nanoimprint are excellent. However, the present invention is not limited thereto. Thus, various materials used in conductive compositions as solvents may be used. Examples of the solvent include ether-based materials such as methyl cellosolve and butyl cellosolve, alcohol-based materials such as ethanol, isopropanol, terpineol, and texanol, glycol-based materials such as ethylene glycol and the like, Based materials such as benzene, toluene, xylene, and the like can be used.

The solvent may be one having an appropriate boiling point in consideration of the filling property, fluidity, and the like. In one example, the boiling point of the solvent may be 190 캜 to 240 캜. In such a range of boiling points, the conductive composition for a nanoimprint can have excellent filling properties and excellent fluidity.

The conductive particles may be contained in an amount of 50 to 80 parts by weight, the binder resin may be contained in an amount of 3 to 15 parts by weight, and the curing agent may be contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the total conductive composition for a nanoimprint. Within this range, it is possible to improve the conductivity, workability, adhesion property, peeling property of the dry film resist, and the like of the conductive pattern formed by using the conductive composition for nanoimprint.

The conductive composition for nanoimprint described above can be obtained by surface-coating metal particles with saturated fatty acids to form conductive particles including metal particles surface-coated with saturated fatty acid, and then mixing the conductive particles, the binder resin, the curing agent, Mixing and dispersing them, filtering and defoaming them. However, such a method for producing a conductive composition for a nanoimprint is merely an example, and the present invention is not limited thereto. The prepared conductive composition for a nanoimprint can be used to make a conductive pattern of various electronic devices. For example, the electrode part of the touch panel (for example, first and second electrodes connected to the external circuit and located in the ineffective area NA) A second connecting portion (or bridge electrode portion) 242b connecting the second sensor portion 142a on the insulating layer 119 within the second wiring portion 144 or 244 or the effective region AA Can be used. However, the present invention is not limited thereto, and the conductive composition for nanoimprint can be applied to various fields.

More specifically, the method for forming the anti-conductive pattern using the conductive composition for nanoimprint of the present invention is as follows. A carrier film (or a dry film resist) having grooves is prepared, a blade or the like is filled in the carrier film with the conductive composition for nanoimprint according to the present invention, and the carrier film is heated at a temperature higher than room temperature (for example, ≪ / RTI > temperature) to evaporate the solvent. (For example, curing at a temperature of 100 to 150 DEG C) after bonding the electrically conductive composition for nanoimprint to the base material so as to be bonded to the base material, and peeling the carrier film using the peeling solution Thereby forming a desired conductive pattern. The dried and thermally cured conductive patterns exhibit conductivity while the conductive particles are in contact with each other while the solvent is being removed.

For example, the electrode part of the touch panel can be formed as a conductive pattern by using the conductive composition for nanoimprint of the present invention.

For example, the first and second wiring portions 144 and 244 can be formed by transferring the conductive composition for nanoimprint onto the non-effective region (NA) of the base film 112 using a nanoimprint.

Or a first sensor portion 142 including a first sensor portion 142a and a first connection portion 142b in the base film 112 in the effective region AA of the base film 112, To form a portion 242a. The first sensor portion 142 and the second sensor portion 242a may be formed by various methods such as vapor deposition. Thereafter, an insulating layer 119 is formed on the first connecting portion 142b. The insulating layer 119 can be formed by various methods such as printing. Thereafter, the conductive composition for a nanoimprint is transferred onto the insulating layer 119 and the second sensor portion 242a using a nanoimprint to form a second connecting portion 242b connecting the second sensor portion 242a .

The conductive composition for a nanoimprint according to the present invention can improve the filling property of the conductive composition for a nanoimprint and the electrical conductivity of a conductive pattern by including conductive particles including metal particles surface-coated with a saturated fatty acid. Further, it is possible to improve the peeling property of the dry film resist including the hardener (for example, latent hardener) and improve the reliability. By using an acetate-based material as a solvent, it is possible to improve workability, filling property, adhesion property, and the like of a conductive material for a nanoimprint.

If a conductive composition for a nanoimprint according to the present invention is used, various conductive patterns (for example, a wiring portion of a touch panel or a bridge electrode portion) can be easily formed by a nanoimprint process. As a result, the process time and cost can be reduced and a fine conductive pattern can be realized as compared with forming a conductive pattern through complicated patterning using deposition.

Hereinafter, the present invention will be described in more detail with reference to Examples of the present invention. The embodiments of the present invention are provided by way of example only and the present invention is not limited thereto.

Example 1

75 parts by weight of conductive particles composed of silver particles having an average particle diameter (D50) of 0.5 占 퐉, a tap density of 4.0 g / ml and a surface of which was coated with a saturated fatty acid, a bisphenol-A type epoxy resin having a glass transition temperature of 80 占 폚 6 parts by weight, and ethyl carbitol acetate (19 parts by weight) were mixed to prepare a conductive composition for nanoimprint.

Example 2

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the average particle diameter of the conductive particles was 0.2 mu m.

Example 3

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the average particle diameter of the conductive particles was 0.8 占 퐉.

Example 4

Conductive composition for nanoimprint was prepared in the same manner as in Example 1, except that the binder resin was bisphenol-A type and the glass transition temperature was 75 占 폚.

Example 5

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the binder resin was bisphenol-A type and the glass transition temperature was 90 占 폚.

Example 6

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the solvent contained diethylene glycol methyl ethyl ether (MEDG).

Example 7

A conductive composition for nanoimprint was prepared in the same manner as in Example 1, except that the solvent contained terpineol.

Example 8

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the solvent contained texanol.

Example 9

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1 except that the solvent was contained in 18.9 parts by weight and the latent curing agent of trade name MY-24 was contained in 0.1 part by weight.

Example 10

A conductive composition for a nanoimprint was prepared in the same manner as in Example 1, except that the solvent was contained in 18.7 parts by weight and 0.3 part by weight of a latent curing agent, trade name MY-24, was contained.

Example 11

Conductive composition for nanoimprint was prepared in the same manner as in Example 1 except that the solvent was contained in 18.5 parts by weight and 0.5 part by weight of a latent curing agent having a trade name of MY-24.

Comparative Example

A conductive composition for a nanoimprint was prepared by the same method as in Example 1, except that the conductive particles were composed of silver particles surface-coated with an unsaturated fatty acid.

Experimental Example

The conductive compositions for nano imprints prepared according to Examples 1 to 11 and Comparative Examples were filled in the grooves using blades, cured, transferred to the base film, and the dry film resist was removed to form the bridge electrode portions of the touch panel. At this time, workability, filling property, adhesion property, resistance of bridge electrode portion, peeling property and reliability of dry film resist (DFR) of the conductive composition for nanoimprint were measured and the results are shown in Table 1. At this time, the workability is judged to be good if the coated conductive paste for nanoimprint is not dried during the imprinting process, and it is judged that it is insufficient if dried. The filling property is judged to be satisfactory when the conductive composition for a nanoimprint is filled into the groove by using a blade, and it is judged that it is insufficient if filling is not performed well. The adhesion property is determined by filling the groove with the conductive composition for nanoimprint, curing at 130 DEG C for 30 minutes, and judging that the conductive composition for nano-imprint printing does not fall off from the base film. The conductivity measures the resistance of the manufactured bridge electrode portion. The delamination characteristics of the dry film resist (DFR) are evaluated as good when the dry film resist is well removed after transferring the conductive composition for nanoimprint, and it is judged that the dry film resist is not sufficiently removed. Reliability is determined by maintaining the touch panel at 85 ° C and 85% for 120 hours. If the operation is good, it is judged to be good. If the operation is not good, it is judged to be insufficient.

Workability Filling
characteristic Attach
characteristic resistance
(Ω) DFR exfoliation
characteristic responsibility Example 1 Good Good Good 45 Good Inadequate Example 2 Good Inadequate Good 60 Good Inadequate Example 3 Good Inadequate Good 38 Good Inadequate Example 4 Good Good Good 56 Good Inadequate Example 5 Good Good Inadequate 42 Good Inadequate Example 6 Inadequate Good Good 40 Good Inadequate Example 7 Good Inadequate Good 45 Good Inadequate Example 8 Good Inadequate Inadequate 58 Good Inadequate Example 9 Good Good Good 43 Good Inadequate Example 10 Good Good Good 40 Good Good Example 11 Good Good Good 40 Inadequate Good Comparative Example Good Inadequate Inadequate 80 Good Inadequate

Referring to Table 1, it can be seen that Example 1 using conductive particles surface-coated with saturated fatty acid has excellent workability, excellent filling characteristics, excellent adhesion properties, low resistance, and excellent dry film resist peeling properties. On the other hand, the comparative example using conductive particles surface-coated with an unsaturated fatty acid has a poor filling property and adhesion property and a high resistance value.

Comparing Example 1 with Examples 2 and 3, it can be seen that Example 1 having an average particle diameter of 0.5 탆 has better filling characteristics than Examples 2 and 3 having an average particle diameter of 0.2 탆 and 0.8 탆, respectively.

Comparing Example 1 with Examples 4 and 5, it can be seen that Examples 1 and 5, which have a glass transition temperature of 75 ° C and 85 ° C, have better adhesion properties than Example 6, which has a glass transition temperature of 90 ° C.

Comparing Example 1 with Examples 6, 7, and 8, Example 1 including an acetate-based material as a solvent has excellent workability, excellent filling property, and excellent adhering property, while a solvent containing glycol- Example 6 It can be seen that Examples 7 and 8, in which the workability is relatively poor, and the alcohol material is used as a solvent, have relatively poor properties such as filling properties.

Comparing Example 1 and Examples 9 to 11, Example 9 comprising 0.1 part by weight of a curing agent exhibited excellent properties similar to those of Example 1, and Examples 10 and 11 It can be understood that this has excellent reliability. However, in Example 11 including 0.5 part by weight of the curing agent, it is found that the peeling property of the dry film resist is lower than that of Example 10 containing 0.3 part by weight of the curing agent.

Features, structures, effects and the like according to the above-described embodiments are included in at least one embodiment of the present invention, and the present invention is not limited to only one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

100: Touch panel
110: Conductive film
112: base film
14: first electrode
142:
142a: first sensor portion
142b: first connecting portion
24: second electrode
242:
242a: second sensor portion
242b: second connection portion (bridge electrode portion)
244: second wiring portion
119: Insulation layer

Claims (16)

A second connection part 242b which is a bridge electrode of the touch panel 100 in which the first electrode 14 and the second electrode 24 are located together on one surface of the base film 112, As a conductive composition used to form portions 144 and 244 by nano-imprinting,
Conductive particles comprising metal particles surface-coated with saturated fatty acids and having an average size of 0.1 to 1.5 占 퐉 and a tap density of 3.5 to 5.0 g / ml;
A binder resin comprising an epoxy-based material having a weight average molecular weight of 70,000 to 90,000 and a glass transition temperature of 75 to 85 ° C;
Curing agent; And
And a solvent comprising an acetate-based material. The method according to claim 1,
Wherein the saturated fatty acid comprises at least one of lauric acid, myristic acid, palmitic acid and stearic acid. The method according to claim 1,
Wherein the curing agent comprises a latent curing agent. The method of claim 3,
Wherein the latent curing agent comprises an amine adduct,
Wherein the latent curing agent has a glass transition temperature of 85 캜 to 105 캜. The method of claim 3,
Wherein the latent curing agent is contained in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of the total conductive composition for nanoimprint. 6. The method of claim 5,
Wherein the latent curing agent is contained in an amount of 0.2 to 1 part by weight based on 100 parts by weight of the entire conductive composition for nanoimprint. The method according to claim 6,
Wherein the latent curing agent is contained in an amount of 0.2 to 0.4 parts by weight based on 100 parts by weight of the total conductive composition for nanoimprint. delete The method according to claim 1,
Wherein the metal particles are selected from the group consisting of Ag, Au, Cu, Ni, Pt, Pd, W, Mo, (Pb), tin (Sn), aluminum (Al), and alloys thereof. 10. The method of claim 9,
Wherein the metal particles comprise silver (Ag). delete delete A second connection part 242b which is a bridge electrode of the touch panel 100 in which the first electrode 14 and the second electrode 24 are located together on one surface of the base film 112, A method of making a conductive composition for use in nanoimprinting portions (144, 244)
Coating the metal particles with a saturated fatty acid to form conductive particles comprising metal particles surface-coated with saturated fatty acid and having an average size of 0.1 占 퐉 to 1.5 占 퐉 and a tap density of 3.5 to 5.0 g / ml; And
Mixing the conductive particles with a solvent comprising a binder resin comprising an epoxy-based material having a weight average molecular weight of 70,000 to 90,000 and a glass transition temperature of 75 ° C to 85 ° C, a curing agent, and an acetate-based material;
≪ / RTI > A conductive composition for a nanoimprint according to any one of claims 1 to 3, wherein a nano imprint is applied to a surface of a base film (112), a first electrode (14) and a second electrode (24) Forming a connection portion 242b and wiring portions 144 and 244 which are electrodes connected to an external circuit to form an electrode portion;
The method comprising the steps of: delete 15. The method of claim 14,
Before the step of forming the electrode part,
Forming a first sensor portion 142 and a second sensor portion 242a including the first sensor 142a portion and the first connection portion 142b in the base film 112; And
Forming an insulating layer (119) over the first connecting portion (142b);
Further comprising:
Wherein forming the electrode portion comprises forming a second connection portion (242b) connecting the second sensor portion (242a) on the insulating layer (119).

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