KR20160062353A - Windable optical multilayer film - Google Patents

Abstract

The present invention relates to an optical multilayer film and, more specifically, relates to an optical multilayer film which forms a protective layer on one side surface of a base layer. The protective layer of the optical multilayer film solves a problem caused by an occurrence or curls to maintain excellent degree of uniform thickness and blocking resistance, and the optical multilayer film may be used in communication and electronic equipment such as a display, a touch panel, a solar cell, or the like.

Description

[0001] WINDABLE OPTICAL MULTILAYER FILM [0002]

The present invention relates to an optical multilayer film having high thickness uniformity, transparency and anti-blocking properties.

In recent telecommunication and electronic devices fields, researches on development of transparent and flexible devices have been emphasized in order to meet the requirements of high portability and aesthetic factors in addition to the tendency to miniaturize, lightweight, thinner and environmentally friendly materials.

For example, the transparent conductive film has a structure in which a transparent conductive thin film is formed on a transparent polymer substrate and widely used for a display, an EL backlight, a touch panel, a solar cell, and an electromagnetic wave shielding material.

Particularly, the introduction rate of touch panels to electronic devices such as mobile phones and tablet PCs is recently increasing, and the demand for transparent conductive films is rapidly expanding.

In order for a transparent conductive film to be used as a material for an electronic component, it is necessary to have high conductivity and transparency, excellent adhesion, heat resistance and durability capable of maintaining a long-term circularity, -scratch) requires a surface hardness of more than a certain level to be imparted.

Since recently used transparent conductive films are required to have thickness uniformity and durability in addition to flexibility and transparency, it is desirable that the sheet resistance on the substrate is 500 Ω / sq or less and the transparency in the visible light region of 380 to 780 nm is 80% Is formed on the transparent conductive layer. As a material widely used for the transparent conductive layer, a metal oxide such as indium tin oxide (ITO), a metal nanowire such as silver nano wire, a carbon material such as carbon nanotube (CNT) or graphene There is a conducting polymer.

Such a transparent conductive film requires a high-temperature drying process for coating a transparent conductive layer on a substrate, and curling occurs at the end of the film through this process. As a result, the uniformity of the thickness in the width direction is lowered, the variation of the in-plane surface resistance of the film is increased, and more conductive material is applied in order to obtain the desired conductivity, The portion is folded as it passes through the roll, so that it is difficult to use as a conductive film.

In addition, when a film is produced or processed, it is often rolled up in a roll. In this case, a film whose thickness uniformity is lowered by curl tends to be scratched on the surface of the film and is inferior in winding property. Blocking is likely to occur.

In order to solve these problems, a protective film called a surface protective film has been conventionally mounted or unevenness has been formed on the substrate layer.

In WO-A-2011/86831, a polypropylene film is heat treated at 40 to 100 ° C for 1 second to 120 seconds, and then heated again at 90 ° C for 1 hour to remove residual stress, Can be minimized. The protective film of this patent suppresses the generation of curl to some extent, but does not take into account any information relating to blocking in the production of rolls.

Korean Patent Laid-Open Publication No. 2014-0047530 discloses a method for preventing occurrence of blocking by forming irregularities by including inorganic particles in a cured resin layer formed on a base layer, and Korean Patent Registration No. 10-0895335 Describes a method of performing a coating containing a plurality of beads on the lower surface of a substrate. In these patents, it is possible to secure the effect of preventing blocking, but the haze of the film is increased due to the inorganic particles, the unevenness and the bead coating layer, and the transparency of the film is greatly lowered.

In other words, these patents solve some of the problems caused by the curl, but their effects are not sufficient and the thickness uniformity in the width direction of the film or the blocking problem in winding can not be solved.

International Publication (WO) Issue 2011/086831 Korean Patent Publication No. 2014-0047530 Korean Patent Registration No. 10-0895335

As a result of various studies on the structure and the material of the film in order to prevent occurrence of curling and to prevent blocking during winding, the Applicant has found that when a protective layer having a specific parameter is formed on one surface of a transparent conductive film, The present invention has been completed.

Accordingly, it is an object of the present invention to provide an optical multilayer film having a uniform resistance and a thickness over the entire surface by preventing curling.

Another object of the present invention is to provide an optical multilayer film winding roll including the optical multilayer film and free from blocking during winding.

According to an aspect of the present invention, there is provided a method of manufacturing a light emitting device including a protective layer, a base layer, and a transparent conductive layer sequentially laminated,

Characterized by the optical multilayer film is greater than or equal to the protective layer surface contact angle over 50 °, the surface roughness more than 0.5㎛ (R _z), and the thickness 30㎛.

These protective layers may be formed of a material selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyetherimide Polyvinyl chloride (PVC), and a combination thereof.

Further, the optical multilayer film having the above-described structure may further include an overcoat layer on the transparent conductive layer.

Further, the present invention is characterized by a winding roll in which the optical multilayer film is wound in a roll form.

The optical multilayer film proposed in the present invention can form a protective layer on one side of a transparent conductive film to maintain transparency while eliminating problems such as thickness irregularities and large sheet resistance deviations caused by curling.

 Further, blocking does not occur even when the winding roll is formed, and the storage stability of the film can be enhanced. Such a high-quality optical multilayer film can be suitably applied to various fields such as a display, a touch panel or a solar cell.

1 is a cross-sectional view showing an optical multilayer film according to a first embodiment of the present invention.
2 is a cross-sectional view showing an optical multilayer film according to a second embodiment of the present invention.

The present invention provides an optical multilayer film which is free from curling and ensures excellent thickness uniformity and can reduce sheet resistance deviation.

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

1 is a cross-sectional view showing an optical multilayer film 10 according to a first embodiment of the present invention.

1, an optical multilayer film 10 according to the present invention is composed of a protective layer 1, a base layer 3, and a transparent conductive layer 5.

At this time, the transparent conductive film 7 has a structure in which the transparent conductive layer 5 is laminated on the base layer 3, and in the present invention, on one side of the base layer 3 constituting the transparent conductive film 7 The protective layer 1 is formed. The protective layer 1 is used when the optical multilayer film 10 is peeled off when it is attached to an apparatus and means a protective film.

Specifically, the protective layer 1 is formed on one side of the base layer 3 to improve the uniformity of the thickness of the conductive layer 5, and when the final optical multilayer film 10 is rolled up, Preventing the blocking phenomenon.

The protective layer 1 is made of a material whose physical properties are controlled so as to have the appropriate mechanical strength, thermal stability, moisture barrier property and transparency so as to perform the above-mentioned role and protect the other layers.

 Preferably, the material of the protective layer 1 is selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate ), Polyetherimide (PEI), polyvinyl chloride (PVC), and combinations thereof. Preferably, one kind selected from polypropylene (PP), polyethylene terephthalide (PET), and combinations thereof is used.

Especially. The parameters related to the protective layer 1 include surface contact angle, surface roughness (R _z ), and thickness, and the effects mentioned in the present invention can be secured through their limitation.

The surface contact angle is a parameter relating to the adhesion between films, and is 50 DEG or more, preferably 60 to 110 DEG in the protective layer 1 of the present invention. At this time, if the surface contact angle is too low, the adhesion between the films increases, and blocking phenomenon occurs during winding. On the contrary, if the surface contact angle is too high, the winding property is lowered.

The surface roughness (R _z ) is a parameter relating to the contact area and transparency, and is characterized by being 0.5 탆 or more, preferably 1 to 5 탆 in the protective layer (1) of the present invention. If the surface roughness (R _z ) is less than the above-mentioned value, the anti-blocking effect is deteriorated because the contact area between the films is widened. On the other hand, if the surface roughness R _z is larger than the numerical value, scratches or surface haze Therefore, it is appropriately selected and used within the above range.

In addition, the protective layer 1 of the present invention has a thickness of 30 占 퐉 or more, preferably 30 to 150 占 퐉. If the thickness is less than 30 占 퐉, it is difficult to improve the curl of the film, resulting in a problem of improvement in uniformity. When the thickness exceeds 150 占 퐉, the volume and the load of the roll increase.

According to the experimental example of the present invention, the optical multilayer film 10 was prepared by adjusting the surface contact angle, surface roughness and thickness parameter, and the physical properties such as sheet resistance, haze and blocking were evaluated, It was confirmed that there is an effect to prevent.

As described above, when the transparent conductive film 7 is attached to an apparatus or the like, the protective layer 1 is peeled from the optical multilayer film 10. At this time, static electricity is generated when the protective layer 1 is peeled, It is possible to cause electric shock to the conductive layer 5 in the film 7 and damage it.

Thus, the protective layer 1 may have an antistatic property on the surface, or may impart antistatic properties to an adhesive layer (not shown) for adhering the transparent conductive film 7 and the protective layer 1.

Examples of a method for imparting antistatic properties include a method of coating an antistatic agent on the surface and a method of adding an antistatic substance such as carbon black or carbon fiber to the layer composition.

In the present invention, a coating liquid composed of a solvent and an antistatic agent is coated on the surface of the substrate by a coating method such as a roll coating method such as reverse coating or gravure coating, a spin coating method, a screen coating method, a fountain coating method, a dipping method, Coated, and dried to exhibit antistatic performance.

Such an antistatic agent is not particularly limited in the present invention, and any known antistatic agent may be used.

Typically, the type of ionic antistatic agent is not particularly limited as long as ionic antistatic agent is suitable and can impart ionic conductivity to ionic salts composed of anion and cation. Specifically, it may be an ionic salt consisting of an anion selected from the group consisting of alkali metal salts, ammonium salts, sulfonium salts and phosphonium salts, and anions selected from the group consisting of fluorine-containing inorganic salts, fluorine-containing organic salts and iodine ions.

To more preferred, the surface resistivity of the protective layer (1) ⁷ to 10 10 ¹¹ Ω / sq so as to have a level, and, when applied to the adhesive layer, the surface resistance of the pressure-sensitive adhesive layer ^{of 5} to 10 10 to ¹⁵ Ω / sq.

The adhesive layer may be coated on one side of the protective layer 1 in the form of a coating composition or may be laminated in a film state.

Such a pressure-sensitive adhesive is not particularly limited in the present invention, and compositions that are commonly used in this field are possible. Typically, one species selected from the group consisting of acrylic, silicone, polyester, polyurethane, polyamide, polyvinyl ether, modified polyolefin, vinyl acetate / vinyl chloride copolymer, epoxy, fluorine, rubber, have.

The base layer 3 constituting the optical multilayer film 10 is not particularly limited in the present invention, and a known polymer material can be used. For example, the substrate layer 3 should have flexibility and transparency, and may be made of polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyethersulfone (PES), polyacrylate (PEI), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cycloolefin polymer (COP), cycloolefin copolymer (COC), cellulose triacetate (CTA) Cellulose acetate propionate (CAP), norbornene resin, and a combination thereof.

These base layers 3 may be in the form of a single film or laminated film.

The thickness of the substrate layer 3 may vary depending on the intended application and can be appropriately adjusted by those skilled in the art.

For example, when used in a display or a touch panel, it is 15 to 150 mu m, preferably 20 to 60 mu m. If the thickness is less than 15 mu m, the substrate will be broken when it is handled alone, which is difficult to handle. On the other hand, if the thickness exceeds 150 mu m, the flexibility is low.

The transparent conductive layer (5) of the present invention is one selected from the group consisting of metal nanowires, metal oxides, carbon materials, conductive polymers, and combinations thereof.

The metal nanowire may be at least one selected from the group consisting of Ag, Au, Cu, Pt, Fe, Co, Ni, Zn, Palladium (Pd), and combinations thereof. Silver (Ag) is preferably used.

The metal nanowires having an average diameter of about 10 to 200 nm and an average length of 0.5 to 100 占 퐉 are used. When the diameter of the metal nanowire is too small, the electrical resistance of the metal nanowire increases, and when the average diameter is too large, the light scattering increases and the transparency may decrease. Therefore, it is preferably 20 to 150 nm, more preferably 30 to 120 nm. Also, when the average length of the metal nanowires is too short, the entanglement of the nanowires is small and the electrical resistance is high. On the contrary, when the average length is too long, the dispersion into the solvent during production becomes unstable. Therefore, it is preferably 1 to 40 占 퐉, more preferably 5 to 30 占 퐉.

In particular, the silver (Ag) nanowire has the best conductivity among metals and has a resistance value of 30 to 120?, Which is lower than that of ITO (200 to 400?) And is advantageous for enlarging the size. , Printing method) coating. In addition, the transparent conductive layer made of silver (Ag) nanowire is almost colorless, so that the color of the image can be faithfully expressed at the time of display application. In addition, silver (Ag) nanowires are particularly flexible and flexible because they are thin and elongate and flexible.

In addition to the above components, the coating composition for forming the transparent conductive layer 5 including the metal nanowires may contain a solvent, a dispersant and, if necessary, a binder or various additives such as a surfactant, a polymerizable compound, an antioxidant, An anti-corrosion agent, a viscosity adjusting agent, and an antiseptic agent.

As the solvent, water is mainly used, and an organic solvent to be mixed with water can be used together with water at a rate of 80% by volume or less. As the organic solvent, an alcohol compound having a boiling point of 50 to 250 DEG C is advantageous when considering the coating and drying steps. Specifically, one selected from methanol, ethanol, ethylene glycol, diethylene glycol, triethylene glycol, glycerin, propylene glycol, 1,3-propanediol, 1,2-butanediol, ethanolamine, isopropanol, have.

The dispersing agent is not particularly limited and can be appropriately selected according to the intended purpose. Examples thereof include an ionic surfactant such as quaternary alkyl ammonium salts, an amino group-containing compound, a thiol group-containing compound, a sulfide group- Or a derivative or a peptide compound thereof. Of these, quaternary alkyl ammonium salts are particularly preferred because they are easy to clean.

The binder or additive is not particularly limited and may be appropriately selected according to the intended purpose.

The material of the metal oxide may be any material used in the transparent conductive film 7, and is not particularly limited in the present invention. Typically, indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), zinc oxide (ZnO), tin oxide (TO), cadmium tin oxide (CTO), fluorine tin oxide (FTO) , Zinc oxide (ZTO), antimony tin oxide (ATO) aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), and combinations thereof.

The carbon material may be one selected from the group consisting of graphene, carbon nanotubes (CNT), carbon nanowires (CNW), and combinations thereof.

The conductive polymer may be one selected from the group consisting of polyaniline, polypyrrole, polythiophene, and combinations thereof.

In addition, the optical multilayer film 10 according to the present invention may further include an overcoat layer 9 on the transparent conductive layer 5.

2 is a cross-sectional view showing an optical multilayer film 10 according to a second embodiment of the present invention.

2, an optical multilayer film 10 according to the present invention is composed of a protective layer 1, a base layer 3, a transparent conductive layer 5, and an overcoat layer 9. At this time, the protective layer 1, the base layer 3 and the transparent conductive layer 5 follow the first embodiment.

The overcoat layer 9 of the present invention not only protects the surface of the film but also improves the adhesion of the transparent conductive layer 5 to the base layer 3.

At this time, the material of the overcoat layer 9 is suitable for the above-mentioned role, and any material that can be photopolymerized or thermally cured can be used. For example, one kind selected from the group consisting of an acrylic type, a urethane type, an epoxy type, an olefin type, an ester type, a melamine type, an amide type, a carbonate type, a cellulose type and a combination thereof is used and is not particularly limited in the present invention. In addition, the material includes both monofunctional or multifunctional monomers, oligomers and polymers.

The thickness of the overcoat layer 9 is not particularly limited in the present invention, but is preferably 10 to 500 nm, more preferably 20 to 300 nm. If the thickness is less than the range, the protective property of the conductive layer deteriorates. On the contrary, if the thickness exceeds the range, the conductive layer is difficult to pattern due to the excessive protection characteristic.

The optical multilayer film according to the present invention as described above is characterized in that the protective layer is located on one side of the substrate layer of the transparent conductive film including the base layer and the transparent conductive layer to effectively prevent curling occurring at the end of the optical multilayer film can do. As a result, thickness uniformity in the width direction can be ensured, and the electric conductivity is uniform over the entire film surface with a deviation of sheet resistance of 10% or less. In addition, the haze is maintained at a level of 5% or less, preferably 2% or less, more preferably 1.5% or less, so that a high quality optical multilayer film having excellent transparency can be produced.

On the other hand, the optical multilayer film according to the present invention is produced in the form of an optical multilayer film wound roll wound in a roll form.

The winding roll of the optical multilayer film can be manufactured by a roll-to-roll apparatus in which the protective layer, the base layer, the transparent conductive layer and the overcoat layer are stacked in this order.

For example, the base layer and the protective layer are bonded together using a bonding roll, and the transparent conductive layer and the overcoat layer are successively coated while moving the base layer and the protective layer by one or more guide rolls.

At this time, also in the obtained winding roll, blocking which occurred conventionally occurs due to the presence of the protective layer, and the storage stability of the transparent conductive film is improved.

The optical multilayer film according to the present invention can be suitably applied to a display, a touch panel or a solar cell as a transparent conductive film while maintaining high transparency, electrical conductivity and thickness uniformity. At this time, it is applicable to these devices by removing the protective layer before use.

When the above optical multilayer film is used in a display, it can be advantageously used as an antistatic agent for a transparent member, an electronic plate shielding, a liquid crystal dimming glass, a transparent heater and the like. In addition, the optical multilayer film of the present invention can be used for both touch panel such as electrostatic capacity type or resistance film type. Specifically, it may be bonded to other substrates such as a glass of a touch panel or a polymer film, or may be used on an outer surface of a touch panel device. In addition, the optical multilayer film is also usable as a transparent electrode of a solar cell.

Hereinafter, preferred embodiments and experimental examples of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited by these examples.

Examples 1 to 4 and Comparative Examples 1 to 8: Production of optical multilayer film

[Example 1]

A protective film was bonded to one side of a polycarbonate film having a thickness of 50 탆 as a base layer, and a water-based silver nanowire solution (average diameter: 40 nm, solid content: 0.2%) was applied on the opposite side to which the protective film was bonded, Respectively. Subsequently, the solvent was dried for 5 minutes in a 100 占 폚 oven, and the coated film was wound into a roll.

The protective film used herein was a PET film having a surface contact angle of 88 占, a surface roughness of 3.6 占 퐉, a thickness of 53 占 퐉, and a surface resistance of 7 * 10 ⁹ ? / Sq.

[Example 2]

After coating and drying the silver nanowire solution in Example 1, the UV curing type overcoat solution (urethane-based composition, Cambriosus overcoat-K-INT01) was diluted with isopropyl alcohol to a solid content of 3% Was coated with a humidity film having a thickness of 8 mu m. Subsequently, the solvent was dried at 100 DEG C for 5 minutes, and the overcoat layer was cured by UV irradiation so that the integrated amount of UV in the UVA region wavelength was 1 J / cm2. The coated film was wound into a roll.

 [Example 3]

Except that the silver nanowire layer was coated and dried in the above Example 2, wound in a first roll, and wound once again to form an overcoat layer. The coated film was wound into a roll.

[Example 4]

A coating film was prepared in the same manner as in Example 1 except that the base layer was a 20 占 퐉 cycloolefin film, and was wound into a roll.

[Comparative Examples 1 to 4]

Except that the protective film was not wound on the back surface of the substrate layer in the above Examples 1 to 4 but wound in a roll.

[Comparative Examples 5 to 8]

Were prepared in the same manner as in Examples 1 to 4 above. The surface contact angle, surface roughness and thickness of the protective film used herein are shown in Table 1 below.

Protective layer Overcoat layer Whether Surface contact angle
(°) Surface roughness
(Rz, mu m) thickness
(탆) Whether Example 1 ○ 88 3.6 53 X Example 2 ○ 88 3.6 53 ○ Example 3 ○ 88 3.6 53 ○ Example 4 ○ 88 3.6 53 X Comparative Example 1 X - - - X Comparative Example 2 X - - - ○ Comparative Example 3 X - - - ○ Comparative Example 4 X - - - X Comparative Example 5 ○ 35 3.6 53 X Comparative Example 6 ○ 35 3.6 53 ○ Comparative Example 7 ○ 60 0.1 60 X Comparative Example 8 ○ 35 3.6 53 ○

Experimental Example 1: Measurement

For evaluating the physical properties of the optical multilayer films obtained in Examples 1 to 4 and Comparative Examples 1 to 6, sheet resistance and deviation, haze, and blocking were evaluated. The results obtained are shown in Table 2 below.

1) Surface Resistance and Deviation: The coating film was placed on a flat glass and the surface resistance of the coated surface was measured using a 4-probe surface resistance meter. The width and the length were divided into five, and the surface resistance was measured at the same intervals, and the average and deviation range were measured.

2) Haze: The haze of the coating film was measured using a haze meter (Murakami Co., HM-150).

3) Whether or not the roll was blocked: The rolled roll was allowed to stand at constant temperature and humidity (25 ° C, 50RH%) for one month, and then the appearance thereof was confirmed. At this time, the evaluation of blocking is as follows.

<Whether blocking>

○: No blocking occurred

X: Blocking occurs

Sheet resistance
(Ω / sq) Sheet resistance deviation
(%) Hayes
(%) Blocking characteristic Example 1 42 5.5 1.5 ○ Example 2 53 6.7 1.0 ○ Example 3 57 5.4 1.1 ○ Example 4 63 7.2 0.9 ○ Comparative Example 1 51 25.3 1.3 X Comparative Example 2 76 37.8 1.2 X Comparative Example 3 84 42.3 1.4 X Comparative Example 4 107 57.3 2.3 X Comparative Example 5 55 7.7 1.2 X Comparative Example 6 67 8.8 1.1 X Comparative Example 7 60 5.5 1.1 X Comparative Example 8 73 8.3 0.9 X

Referring to Table 2, when the protective layer was bonded to one side of the substrate layer according to the present invention, the sheet resistance deviation was evaluated in the same manner as in Comparative Examples 1 to 4 in which the protective film was not bonded and in Comparative Examples 5 to 8 in which protective films having different physical properties were bonded. As a result, it was confirmed that Examples 1 to 4 had a value of 8.0% or less, and the uniformity of the thickness was improved by curl suppression. Also, it was confirmed that the haze was also excellent.

In addition, it was confirmed that blocking occurred in Comparative Examples 1 to 4 in which no protective layer was introduced and in Comparative Examples 5 to 8 in which protective films having different physical properties were bonded.

The optical multilayer film according to the present invention has excellent thickness uniformity and blocking resistance, and the optical multilayer film can be used for various communication and electronic devices such as a display, a touch panel, and a solar cell.

1: protective layer 3: substrate layer
5: transparent conductive layer 7: transparent conductive film
9: overcoat layer 10: optical multilayer film

Claims (16)

A protective layer, a base layer, and a transparent conductive layer are sequentially laminated,
The protective layer is a surface contact angle of 50 ° or more, the surface roughness (R _z) 0.5㎛ later, and the optical multilayer film, characterized in that at least the thickness 30㎛. The optical multilayer film according to claim 1, wherein the protective layer has a surface contact angle of 60 to 110 °, a surface roughness (R _z ) of 1 to 5 μm and a thickness of 30 to 150 μm. The optical multilayer film according to claim 1, wherein the protective layer has a surface resistance of 10 ⁷ to 10 ¹¹ Ω / sq. [2] The method of claim 1, wherein the protective layer is formed of a material selected from the group consisting of polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEI), poly (vinyl chloride) (PVC), and combinations thereof. [2] The method of claim 1, wherein the base layer comprises at least one of polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyethersulfone (PES), polyacrylate (PAR), polyetherimide , Polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cycloolefin polymer (COP), cycloolefin copolymer (COC), cellulose triacetate (CTA), cellulose acetate propionate CAP), a norbornene resin, and a combination thereof. The optical multilayer film according to claim 1, wherein the transparent conductive layer comprises one selected from the group consisting of metal nanowires, metal oxides, carbon materials, conductive polymers, and combinations thereof. [7] The method of claim 6, wherein the metal nanowire is selected from the group consisting of Ag, Au, Cu, Pt, Fe, Co, Ni, Ruthenium (Ru), palladium (Pd), and combinations thereof. 7. The method of claim 6, wherein the metal oxide is selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), zinc oxide (ZnO), tin oxide (TO), cadmium tin oxide (1) selected from the group consisting of fluorine tin oxide (FTO), zinc tin oxide (ZTO), antimony tin oxide (ATO) aluminum doped zinc oxide (AZO), gallium doped zinc oxide (GZO) Lt; RTI ID = 0.0 &gt; a &lt; / RTI &gt; species. [7] The method of claim 6, wherein the carbon material comprises one selected from the group consisting of graphene, carbon nanotubes (CNT), carbon nanowires (CNW), and combinations thereof Characterized by an optical multilayer film. 7. The optical multilayer film according to claim 6, wherein the conductive polymer comprises one selected from the group consisting of polyaniline, polypyrrole, polythiophene, and combinations thereof. The optical multilayer film according to claim 1, wherein the protective layer and the substrate layer are bonded to each other with an adhesive layer. 12. The optical multilayer film according to claim 11, wherein the adhesive layer has a surface resistance of 10 ⁵ to 10 ¹⁵ Ω / sq. The optical multilayer film according to claim 1, further comprising an overcoat layer formed on the transparent conductive layer. 14. The optical multilayer film according to claim 13, wherein the overcoat layer is one selected from the group consisting of acrylic, urethane, epoxy, olefin, ester, amide, carbonate, cellulose and combinations thereof. The optical multilayer film according to claim 1, wherein the optical multilayer film has a deviation of sheet resistance of 10% or less and a haze of 5% or less. An optical multilayer film winding roll in which the optical multilayer film according to any one of claims 1 to 15 is rolled up.

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