KR102207876B1 - Windable optical multilayer film - Google Patents

Abstract

The present invention relates to an optical multilayer film, and more particularly, to an optical multilayer film in which a protective layer is formed on one side of a base layer.
The protective layer of the optical multilayer film solves the problem caused by curling to maintain excellent thickness uniformity and blocking resistance, and the optical multilayer film can be used in various communication and electronic devices such as displays, touch panels, and solar cells. .

Description

Windable optical multilayer film {WINDABLE OPTICAL MULTILAYER FILM}

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

In recent years, in the field of communication and electronic devices, research on the development of transparent and flexible devices has become important in accordance with the demands of high portability and aesthetic factors in addition to the trend of miniaturization, weight reduction, thin film reduction, and environmentally friendly materials.

For example, a transparent conductive film has a structure in which a transparent conductive thin film is formed on a transparent polymer substrate, and is widely used in displays, EL backlights, touch panels, solar cells, electromagnetic wave blocking materials, and the like.

In particular, in recent years, the introduction rate of touch panels to electronic devices such as mobile phones and tablet PCs is 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 electronic components, high conductivity and transparency, excellent adhesion, heat resistance and durability that can maintain a circular shape for a long period of time, surface treatment, and easy processability are required. Recently, anti-scratch (anti -Scratch) is required for a certain level of surface hardness or higher.

Recently used transparent conductive films require flexibility and transparency, as well as thickness uniformity and durability, so they have excellent electrical conductivity with a sheet resistance of 500Ω/sq or less on the substrate, and transmittance of 80% or more in the visible light region of 380 to 780 nm. A transparent conductive layer that satisfies is formed. At this time, the material widely used for the transparent conductive layer is a metal oxide such as indium tin oxide (ITO), a metal nanowire such as silver nanowire, a carbon material such as carbon nanotube (CNT) or graphene, or There is a conducting polymer.

Such a transparent conductive film requires a high-temperature drying process to coat a transparent conductive layer on a substrate, and curling occurs at the end of the film during this process. As a result, the thickness uniformity in the width direction decreases, and the deviation of the in-plane surface resistance of the film increases. In order to obtain the target conductivity, more than necessary conductive material is applied, resulting in material loss, and the transmittance is greatly reduced. As the part passes through the roll and folds, breakage occurs, making it difficult to use as a conductive film.

Moreover, when producing or processing the film, it is often rolled up in a roll shape. At this time, films with poor thickness uniformity due to curls are prone to scratches on the surface of the film, and have inferior winding properties and are different from each other when stored or transported with a winding roll. Sticking blocking is likely to occur.

In order to solve these problems, a protective film called a conventional surface protective film is mounted or irregularities are formed in the base layer.

In WO 2011/086831, a polypropylene film is heat-treated at 40 to 100°C for 1 to 120 seconds and then heated at 90°C for 1 hour to remove residual stress. It is disclosed that can be minimized. The protective film of this patent suppressed the occurrence of curls to some extent, but the content related to blocking was not considered at all when manufactured in the form of a winding roll.

Looking at the blocking-related patent, Korean Patent Publication No. 2014-0047530 proposes a method of preventing the occurrence of blocking by forming irregularities by including inorganic particles in the cured resin layer formed on the substrate layer. Korean Patent Registration No. 10-0895335 The issue refers to a method of performing a coating containing a plurality of beads on the underside of a substrate. In these patents, it was possible to secure the effect of preventing blocking, but a problem in which the transparency of the film was greatly decreased due to the increase in haze of the film due to the inorganic particles, irregularities, and bead coating layer occurred.

That is, some of the problems caused by curling have been solved in these patents, but the effect is not sufficient, and thus the thickness uniformity in the width direction of the film or the blocking problem during winding cannot be solved.

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

Accordingly, as a result of various studies related to the structure and material of the film so that curling does not occur and blocking does not occur during winding, the applicant of the present invention solves the above problem when a protective layer having a specific parameter is formed on one side of the transparent conductive film. It was confirmed that the present invention was completed.

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

In addition, another object of the present invention is to provide an optical multilayer film winding roll that includes the optical multilayer film and does not cause blocking during winding.

In the present invention, in order to achieve the above object, a protective layer, a base layer, and a transparent conductive layer are sequentially stacked,

The protective layer is characterized by an optical multilayer film having a surface contact angle of 50° or more, a surface roughness (R _z ) of 0.5 μm or more, and a thickness of 30 μm or more.

These protective layers are polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalide (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyetherimide (PEI), It is characterized by including one selected from the group consisting of polyvinyl chloride (PVC) and combinations thereof.

In addition, the optical multilayer film of the above configuration may further include an overcoat layer on the transparent conductive layer.

In addition, the present invention features a winding roll in which the optical multilayer film is wound in a roll shape.

The optical multilayer film presented in the present invention can maintain transparency while solving problems such as thickness non-uniformity and large sheet resistance variation due to curling by forming a protective layer on one surface of the transparent conductive film.

In addition, blocking does not occur even when forming the winding roll, so that the preservability of the film can be improved. This high-quality optical multilayer film can be preferably 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 capable of securing excellent thickness uniformity and reducing variation in sheet resistance due to no curling.

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.

Referring to Figure 1, the 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 a transparent conductive layer 5 is stacked on the base layer 3, and in the present invention, on one side of the base layer 3 constituting the transparent conductive film 7 A protective layer 1 is formed. This protective layer 1 is used by peeling off the optical multilayer film 10 when attached to a device, and means a protective film.

Specifically, the protective layer (1) is formed on one side of the substrate layer (3) to improve the thickness uniformity of the conductive layer (5), and when the final manufactured optical multilayer film (10) is wound in a roll shape, the films adhere to each other. It serves to prevent blocking.

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

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

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

The surface contact angle is a parameter related to adhesion between films, and is characterized in that it is 50° or more, preferably 60 to 110° 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 occurs during winding. On the contrary, if the surface contact angle is too high, the winding property decreases. Therefore, it is preferable to use appropriately within the above range.

Further, the surface roughness (R _z ) is a parameter related to the contact area and transparency, and is characterized in that it is 0.5 μm or more, preferably 1 to 5 μm, in the protective layer 1 of the present invention. If the surface roughness (R _z ) is less than the above value, the contact area between the films is wide and the blocking prevention effect decreases. If the value is exceeded, on the contrary, scratches may occur on the other side of the film or the haze increases, resulting in a problem of lowering transparency Therefore, it is appropriately selected and used within the above range.

In addition, the protective layer 1 of the present invention is characterized in that the thickness is 30 μm or more, preferably 30 to 150 μm. If the thickness is less than 30 µm, it is difficult to improve the curl of the film, so that a problem may occur in improving the uniformity. If the thickness is more than 150 µm, the volume and load of the roll increase, so that it is appropriately used within the above range.

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 parameters, and as a result of evaluating physical properties such as sheet resistance, haze, and blocking, in particular, sheet resistance deviation reduction and blocking It was confirmed that it is effective in preventing.

As already mentioned, the protective layer 1 is peeled off from the optical multilayer film 10 when the transparent conductive film 7 is attached to a device, as already mentioned, and at this time, static electricity is generated and transparent conductivity. By inducing an electric shock to the conductive layer 5 in the film 7, it may be damaged.

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

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

Among them, in the present invention, a coating solution consisting of a solvent and an antistatic agent on the surface is applied using a coating method such as reverse coating, gravure coating, roll coating, spin coating, screen coating, fountain coating, dipping, spraying, etc. It can be applied and dried to show antistatic performance.

These antistatic agents are not particularly limited in the present invention, and any of them may be used as long as they are known.

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

More preferably, the surface resistance of the protective layer 1 is 10 ⁷ to 10 ¹¹ Ω/sq level, and when applied to an adhesive layer, the surface resistance of the adhesive layer is 10 ⁵ to Adjust to 10 ¹⁵ Ω/sq.

The adhesive layer may be formed by coating on one surface of the protective layer 1 in the form of a coating composition, or may be laminated in a film state.

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

In addition, the base layer 3 constituting the optical multilayer film 10 is not particularly limited in the present invention, and a known polymer material may be used. For example, the base layer 3 should have flexibility and transparency, and polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyethersulfone (PES), polyacrylate (PAR), poly Ether imide (PEI), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cycloolefin polymer (COP), cycloolefin copolymer (COC), cellulose triacetate (CTA), One selected from the group consisting of cellulose acetate propionate (CAP), norbornene resin, and combinations thereof is used.

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

At this time, the thickness of the base layer 3 may vary depending on the intended use and may be appropriately adjusted by a person skilled in the art.

For example, in the case of using a display or a touch panel, 15 to 150 μm, preferably 20 to 60 μm, is used. If the thickness is less than 15 μm, fracture occurs when the substrate is handled alone, making it difficult to handle. Conversely, if the thickness exceeds 150 μm, the flexibility decreases.

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

The metal nanowires include silver (Ag), gold (Au), copper (Cu), platinum (Pt), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), ruthenium (Ru), One type selected from the group consisting of palladium (Pd) and combinations thereof is possible. Silver (Ag) is preferably used.

The metal nanowires have an average diameter of about 10 to 200 nm and an average length of 0.5 to 100 μm. If the diameter of the metal nanowire is too small, its own electrical resistance increases, while if the average diameter is too large, light scattering increases, thereby reducing transparency. Therefore, preferably 20 to 150 nm, more preferably 30 to 120 nm is used. In addition, when the average length of the metal nanowires is too short, the electrical resistance increases because the nanowires are less entangled. Conversely, when the average length is too long, dispersion in the solvent becomes unstable during manufacture. Therefore, preferably 1 to 40 μm, more preferably 5 to 30 μm is used.

In particular, silver (Ag) nanowires have the best conductivity among metals, have a resistance value of 30 to 120 Ω, which is lower than ITO (200 to 400 Ω), which is advantageous for large size, and can be made by a solution process. , Printing method) There is an advantage that it can be applied by coating. In addition, since the transparent conductive layer made of silver (Ag) nanowires is almost colorless, the color of an image can be faithfully expressed when applied to a display. In addition, since silver (Ag) nanowires are flexible in a long and thin form, they are particularly useful for flexible displays because they can be curved.

In the coating composition for forming the transparent conductive layer 5 including the metal nanowires, in addition to the above components, a solvent, a dispersant, and, if necessary, a binder or various additives, for example, a surfactant, a polymerizable compound, an antioxidant, and sulfurization It may contain inhibitors, corrosion inhibitors, viscosity modifiers and preservatives.

Water is mainly used as the solvent, and an organic solvent mixed with water may be used with water in a ratio of 80% by volume or less. As the organic solvent, an alcohol-based compound having a boiling point of 50 to 250°C is advantageous in consideration of 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, and combinations thereof can be used. have.

The dispersant is not particularly limited and may be appropriately selected according to the intended purpose, for example, ionic surfactants such as quaternary alkylammonium salts, amino group-containing compounds, thiol group-containing compounds, sulfide group-containing compounds, amino acids Or derivatives or peptide compounds thereof. Among them, quaternary alkyl ammonium salts are particularly preferred because they are easy to clean.

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

The material of the metal oxide may be any material as long as it is a 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 tin oxide (ZTO), antimony tin oxide (ATO) aluminum-doped zinc oxide (AZO), gallium-doped zinc oxide (GZO), and one selected from the group consisting of a combination thereof.

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

The conductive polymer is 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.

Referring to Figure 2, the 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 what was mentioned in the first embodiment.

The overcoat layer 9 of the present invention serves not only to protect the film surface, but also to improve the adhesion of the above-described transparent conductive layer 5 to the base layer 3.

At this time, the material of the overcoat layer 9 is suitable for the above role, and any material capable of photopolymerization or heat curing may be used. For example, one selected from the group consisting of acrylic, urethane, epoxy, olefin, ester, melamine, amide, carbonate, cellulose, and combinations thereof is used, and is not particularly limited in the present invention. In addition, the material includes all of monofunctional or polyfunctional 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, there is a problem that the protective properties of the conductive layer are deteriorated. Conversely, when the thickness exceeds the range, patterning of the conductive layer becomes difficult due to excessive protection characteristics.

The optical multilayer film according to the present invention as described above has a protective layer positioned on one side of the substrate layer of the transparent conductive film including the substrate layer and the transparent conductive layer, effectively preventing the occurrence of curls occurring at the ends of the optical multilayer film. can do. As a result, thickness uniformity in the width direction can be ensured, and the variation in sheet resistance is 10% or less, and the electrical conductivity is uniform over the entire film surface. In addition, the haze is maintained at a level of 5% or less, preferably 2% or less, and more preferably 1.5% or less, so that a high-quality optical multilayer film having excellent transparency can be manufactured.

Meanwhile, the optical multilayer film according to the present invention is manufactured in the form of an optical multilayer film winding roll wound in a roll shape.

As for the winding roll of the optical multilayer film, the above-described protective layer, the base layer, the transparent conductive layer, and the overcoating layer can be stacked in order by a roll-to-roll device.

For example, after bonding the base layer and the protective layer using a bonding roll, the transparent conductive layer and the overcoating layer are sequentially coated while moving them by one or more guide rolls to finally form a winding roll.

At this time, the obtained winding roll also does not cause blocking, which has occurred due to the presence of the protective layer, so that the storage property of the transparent conductive film is improved.

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

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

Hereinafter, preferred embodiments and experimental examples of the present invention are presented. 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: Preparation of optical multilayer film

[Example 1]

After bonding a protective film to one side of a 50 μm-thick polycarbonate film as a base layer, a water-based silver nanowire solution (average diameter 40 nm, solid content 0.2%) was applied to the opposite side of the protective film to a thickness of 20 μm. Coated. Then, after drying the solvent for 5 minutes in a drying furnace at 100°C, the coated film was wound up with a roll.

At this time, a PET film having a surface contact angle of 88°, a surface roughness of 3.6 μm, a thickness of 53 μm, and a surface resistance of 7*10 ⁹ Ω/sq was used.

[Example 2]

After coating and drying the silver nanowire solution in Example 1, a UV-curable overcoat solution (urethane-based composition, Cambrios Overcoat-K-INT01) was diluted with isopropyl alcohol to a solid content of 3%, and then on the nanowire layer. The humidity film was coated with a thickness of 8 μm. Subsequently, the solvent was dried at 100° C. for 5 minutes, and the overcoat layer was cured by irradiating with UV so that the cumulative amount of UV light in the wavelength of the UVA region was 1 J/cm 2. The coated film was wound up with a roll.

[Example 3]

After coating and drying the silver nanowire layer in Example 2, it was carried out in the same manner except for the method of forming an overcoat layer by first winding it up with a roll and then unwinding it again. The coated film was wound up with a roll.

[Example 4]

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

[Comparative Examples 1 to 4]

It was prepared in the same manner as in Examples 1 to 4 except that the protective film was not bonded to the back of the base layer and wound with a roll.

[Comparative Examples 5 to 8]

It was prepared in the same manner as in Examples 1 to 4. The surface contact angle, surface roughness, and thickness of the protective film used at this time are shown in Table 1 below.

Protective layer Overcoat layer Whether Surface contact angle
(°) Surface roughness
(Rz, μm) thickness
(㎛) 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

In order to evaluate 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 obtained results are shown in Table 2 below.

1) Surface resistance and deviation: After placing the coating film on a flat glass, the surface resistance of the coated surface was measured using a 4-probe surface resistance meter. The length in the width direction was divided into 5 and the surface resistance was measured at equal intervals to measure the average and the deviation range.

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

3) Blocking status: After leaving the rolled roll in constant temperature and humidity (25℃, 50RH%) for 1 month, the appearance was checked to check whether blocking occurred on the roll. At this time, the evaluation of whether to block is as follows.

<Blocking or not>

○: No blocking

X: blocking occurs

Sheet resistance
(Ω/sq) Sheet resistance deviation
(%) Haze
(%) Blocking characteristics 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 is bonded to one side of the substrate layer according to the present invention, the sheet resistance deviation is compared with Comparative Examples 1 to 4 in which the protective film is not bonded and Comparative Examples 5 to 8 in which the protective films having different physical properties are bonded. In comparison, Examples 1 to 4 had a value of 8.0% or less, and it was confirmed that the thickness uniformity was improved by suppressing the occurrence of curls. In addition, it was confirmed that the haze also showed excellent numerical values.

In addition, it was confirmed that blocking occurred in Comparative Examples 1 to 4 in which the protective layer was not introduced and 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 in various communication and electronic devices such as displays, touch panels, and solar cells.

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

Claims (16)

In the optical multilayer film in which a protective layer, a base layer, and a transparent conductive layer are sequentially laminated,
The protective layer is used by peeling off the optical multilayer film when it is mounted on a device, and has a surface contact angle of 50° or more, a surface roughness (Rz) of 0.5 μm or more, and a thickness of 30 μm or more. The optical multilayer film of 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 of claim 1, wherein the protective layer has a surface resistance of 10 ⁷ to 10 ¹¹ Ω/sq. The method according to claim 1, wherein the protective layer is polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalide (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polyether. An optical multilayer film comprising one selected from the group consisting of mid (PEI), polyvinyl chloride (PVC), and combinations thereof. The method according to claim 1, wherein the base layer is polyethylene terephthalide (PET), polyethylene naphthalate (PEN), polyimide (PI), polyether sulfone (PES), polyacrylate (PAR), polyether imide (PEI). , Polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cycloolefin polymer (COP), cycloolefin copolymer (COC), cellulose triacetate (CTA), cellulose acetate propionate ( CAP), norbornene-based resin, and an optical multilayer film comprising one selected from the group consisting of a combination thereof. The optical multilayer film according to claim 1, wherein the transparent conductive layer includes one selected from the group consisting of metal nanowires, metal oxides, carbon materials, conductive polymers, and combinations thereof. The method according to claim 6, wherein the metal nanowire is silver (Ag), gold (Au), copper (Cu), platinum (Pt), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), An optical multilayer film comprising one selected from the group consisting of ruthenium (Ru), palladium (Pd), and combinations thereof. The method according to claim 6, wherein the metal oxide is indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), zinc oxide (ZnO), tin oxide (TO), cadmium tin oxide (CTO), 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), and combinations thereof Optical multilayer film comprising a species. The method of claim 6, wherein the carbon material includes one selected from the group consisting of graphene, carbon nanotubes (CNT), carbon nanowires (CNW), and combinations thereof. Optical multilayer film characterized by. The optical multilayer film of 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 base layer are bonded with an adhesive layer. The optical multilayer film of claim 11, wherein the adhesive layer has a surface resistance of 10 ⁵ to 10 ¹⁵ Ω/sq. The optical multilayer film of claim 1, further comprising forming an overcoat layer on the transparent conductive layer. The optical multilayer film of claim 13, wherein the overcoating 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 variation in 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 wound up in a roll shape.

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