KR20150073230A - Transparent conductive film and touch screen panel including the same - Google Patents

Abstract

In the present invention, provided is a transparent conductive film, consecutively including a polyethylene based sheet-made protective film; a conductive film; and a transparent plastic substrate wherein light transmittance of the protective film is at least 92.4 %, the haze value of the protective film is not more than 7.25 and is transparent conductive film for the film whose thickness is 45 μm based on ASTM D1003-97.

Description

TECHNICAL FIELD [0001] The present invention relates to a transparent conductive film and a touch screen panel including the transparent conductive film.

To a transparent conductive film and a touch screen panel including the transparent conductive film.

The transparent electrode film is one of the most important parts in manufacturing the touch panel. The most widely used transparent electrode film to date is indium tin oxide (ITO) film having a total light transmittance of 85% or more and a surface resistance of 400? / Square or less. In general, a transparent electrode film is used as a base film in which a primer coating treatment and a hard coating treatment are applied to a transparent polymer film so as to have surface flatness and heat resistance. On the base film, an undercoat layer is formed by wet coating or sputtering method, and then a transparent conductive layer such as ITO is formed by a sputtering method.

One embodiment of the present invention provides a transparent conductive film excellent in light transmittance and haze value.

Another embodiment of the present invention provides a touch screen panel to which the transparent conductive film is applied.

In one embodiment of the invention,

A protective film sequentially formed of a polyethylene (PE) based sheet; A conductive layer; And a transparent plastic substrate,

The protective film has a light transmittance of about 92.4% or more, and a haze value of about 7.25% or less measured on a film of about 45 탆 thickness according to ASTM D1003-97.

The protective film may have a thickness of about 40 탆 to about 50 탆.

The transparent plastic substrate may have a thickness of about 20 탆 to about 1000 탆.

The transparent plastic substrate may include PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PES (polyethersulfone), PC (poly carbonate), PP (polypropylene), norbornene resins and combinations thereof.

The conductive layer may have a thickness of about 5 占 퐉 to about 200 占 퐉.

The conductive layer may include at least one selected from the group consisting of ITO (Indium Tin Oxide), FTO (Fluorine-doped Tin Oxide), IZO (Indium Tin Oxide), ITZO (Indium Tin Zinc Oxide), AZO (Aluminum Zinc Oxide) ATO), and combinations thereof.

And an undercoat layer interposed between the transparent plastic substrate and the conductive layer.

The undercoat layer may comprise silicon oxide (SiOx), silicon nitride (SiON), or niobium oxide (NbOx).

And a hard coating layer interposed between the transparent plastic substrate and the undercoat layer.

The hard coating layer may include at least one selected from the group consisting of an acrylic resin, a urethane resin, an epoxy resin, a siloxane resin, a melamine resin, and a combination thereof.

In another embodiment of the present invention, there is provided a touch screen panel comprising the transparent conductive film.

The transparent conductive film may provide excellent optical characteristics while ensuring ease of manufacture when applied to a touch screen panel.

1 is a schematic cross-sectional view of a transparent conductive film according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In one embodiment of the present invention, a protective film formed sequentially of a polyethylene (PE) based sheet; A conductive layer; And a transparent plastic substrate, wherein the protective film has a light transmittance of about 92.4% or more, and a haze value of about 7.25% or less measured on a film of about 45 탆 thickness according to ASTM D1003-97 do.

Since the protective film has a transmittance of about 92.4% or more and a haze value of about 7.25% or less, the optical characteristics are improved and problems such as fine scratches and adhesion of foreign matter, It can be confirmed immediately by the naked eye.

As a result, when a transparent conductive film having a protective film is applied to a touch screen panel, it is possible to remove the need for troublesome processes such as peeling off the protective film to check whether the conductive layer is defective or not, .

As described above, the transparent conductive film includes a protective film having a transmittance of about 92.4% or more and a haze value of about 7.25% or less, thereby realizing excellent optical characteristics and ensuring easiness of the manufacturing process.

1, a transparent conductive film 100 according to an embodiment of the present invention is provided.

The transparent conductive film 100 includes a protective film 130 formed of a polyethylene (PE) -based sheet sequentially; Conductive layer 120; And a transparent plastic substrate 110. The protective film has a light transmittance of at least about 92.4%, and a haze value of about 7.25% or less measured on a film of about 45 탆 thickness according to ASTM D1003-97.

The transparent plastic substrate 110 may have a thickness of, for example, about 20 탆 to about 1000 탆. By forming the transparent conductive film 100 in the thickness range described above, the necessary mechanical strength can be secured without excessively increasing the total thickness of the transparent conductive film 100.

The transparent plastic substrate 110 may be a film having excellent transparency and strength. For example, the transparent plastic substrate 110 may be made of a material selected from the group consisting of polyethylene terephthalate (PET), polyethylenenaphthalate (PEN), polyethersulfone (PES), polycarbonate (PC) ), Norbornene-based resins, and combinations thereof. However, the present invention is not limited thereto.

The transparent plastic substrate 110 may further include, for example, acrylic resin, organic particles, or inorganic particles to provide an antistatic effect or an anti-reflective coating effect.

The transparent plastic substrate 110 may be, for example, a single film formed of one film or a laminated film in which a plurality of films are laminated.

The conductive layer 120 may have a thickness of, for example, from about 5 占 퐉 to about 200 占 퐉, and may also be, for example, from about 15 占 퐉 to about 100 占 퐉. The thickness of the transparent conductive film 100 can be set within the above-mentioned range, so that the required thickness can be ensured without increasing the total thickness of the transparent conductive film 100, and the role as an electrode can be appropriately performed.

The conductive layer 120 may be formed of, for example, indium tin oxide (ITO), fluorine-doped tin oxide (FTO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO) , ATO (Antimony Tin Oxide), ATO (ATO), and combinations thereof. However, the present invention is not limited thereto.

The conductive layer 120 may be formed of, for example, a single layer, or may be formed of multiple layers in which a plurality of layers are stacked.

The protective film 130 may be formed of a polyethylene-based sheet. The protective film 130 may be formed of a polyethylene-based sheet to have a light transmittance of about 92.4% or more, and a thickness of about 45 탆 according to ASTM D1003-97 The haze value measured with respect to the film of the protective film 130 is not more than about 7.25%, so that the defect of the conductive layer 120 laminated on the protective film 130 can be visually confirmed immediately.

As a result, when the transparent conductive film 100 having the protective film 130 is applied to a touch screen panel, it is possible to simplify the manufacturing process as described above, There are advantages.

The protective film 130 may have a thickness of, for example, about 40 탆 to about 50 탆. By forming the layer within the above-mentioned thickness range, the haze value can be reduced while maintaining high light transmittance, thereby realizing more excellent optical characteristics.

The protective film 130 may be a self-adhesive film that can exhibit adhesive properties without being tacky, for example, when the protective film 130 is laminated on the conductive layer 120. Thus, the protective film 130 is self- It is possible to eliminate the deterioration of optical characteristics caused by the light.

The transparent plastic substrate 110 and the conductive layer 120 may further include an undercoat layer interposed between the transparent plastic substrate 110 and the conductive layer 120 to improve the insulating property between the transparent plastic substrate 110 and the conductive layer 120 . In addition, it is possible to further prevent the elution of unreacted monomers and oligomers, which may be present in the transparent plastic substrate, by further including the undercoat layer.

The thickness of the undercoat layer may be, for example, about 10 nm to about 100 nm. By forming the undercoat layer within the thickness range, cracking of the coating layer can be prevented and excellent visibility can be realized.

The undercoat layer may include, but is not limited to, for example, silicon oxide (SiOx), silicon nitride (SiON), or niobium oxide (NbOx).

The undercoat layer may be formed, for example, as a single layer, and may be formed as a multilayer in which a plurality of layers are stacked.

In one embodiment, the transparent plastic substrate 110 may further include a hard coating layer interposed between the transparent plastic substrate 110 and the undercoat layer to improve the surface hardness of the transparent plastic substrate 110.

The hard coating layer may contain at least one selected from the group consisting of acrylic resin, urethane resin, epoxy resin, siloxane resin, melamine resin, and combinations thereof, but is not limited thereto.

In another embodiment of the present invention, there is provided a touch screen panel comprising the transparent conductive film. The transparent conductive film is as described above in one embodiment.

The touch screen panel may be a laminate in which the transparent conductive film, the adhesive film, and the transparent plastic substrate such as a glass substrate or a transparent resin sheet are sequentially laminated.

A known composition may be used to form the adhesive film as an optically clear adhesive layer (OCA). Specifically, the pressure-sensitive adhesive film may be made of a material selected from the group consisting of 2-ethylhexyl acrylate (2-EHA), isobonyl acrylate (IBOA), hydroxyethyl acrylate (HEA) A photoinitiator, a hardener and other additives selected from the group consisting of HBA, hydroxyl butyl acrylate (HBA), hydroxyl propyl acryalte (HPA), hexyl methacrylate (HMA) May be formed, for example, by photocuring or thermosetting by light irradiation such as UV.

Hereinafter, examples and comparative examples of the present invention will be described. The following embodiments are only examples of the present invention, and the present invention is not limited to the following embodiments.

( Example )

Example  One

An acrylic hard coating liquid was applied to a surface of a PET film having a thickness of 100 탆 to a thickness of 1.2 탆 and ultraviolet cured to form a hard coating layer, and then a silicon oxide thin film was formed to a thickness of 25 nm on the surface of the hard coating layer by a reactive sputtering method, ITO was formed on one surface of the undercoat layer to a thickness of 20 nm by reactive sputtering to form a conductive layer and then a protective film having a thickness of 41 탆 was formed on one surface of the conductive layer using a polyethylene sheet. And laminated by self-adhesive bonding, thereby producing a transparent conductive film.

Example  2

A transparent conductive film was produced under the same conditions and under the same conditions as in Example 1, except that a protective film having a thickness of 45 탆 was prepared using a polyethylene sheet.

Example  3

A transparent conductive film was produced under the same conditions and under the same conditions as in Example 1, except that a protective film having a thickness of 49 탆 was prepared using a polyethylene sheet.

Comparative Example  One

A transparent conductive film was produced under the same conditions and under the same conditions as in Example 1, except that a protective film having a thickness of 41 mu m prepared using a polyethylene terephthalate-based sheet was used

Comparative Example  2

A transparent conductive film was produced under the same conditions and under the same conditions as in Example 1 except that a protective film having a thickness of 35 mu m produced by using a polyethylene sheet was used.

Comparative Example  3

A transparent conductive film was produced under the same conditions and under the same conditions as in Example 1, except that a protective film having a thickness of 55 m prepared using a polyethylene-based sheet was used.

evaluation

The properties of each of the transparent conductive films prepared in Examples 1-3 and 1-3 and the protective films contained in the transparent conductive films were evaluated according to the following evaluation methods.

(Light transmittance)

The transmittance of the protective film and the transparent conductive film was measured according to JIS K7361-1 using a spectrophotometer (Konica Minolta, CM-5). The results are shown in Table 1 below.

 (Hayes)

The haze value of the protective film and the transparent conductive film was measured according to ASTM D1003-97 using a spectrophotometer (Konica Minolta, CM-5) for a 45 탆 thick film, and the results are shown in Table 1 below .

division Protective film Transparent conductive film Light transmittance
[%] Haze value
[%] Light transmittance
[%] Haze value
[%] Example 1 92.58 5.34 89.66 6.95 Example 2 92.63 6.38 89.82 7.03 Example 3 92.44 7.23 89.52 7.45 Comparative Example 1 92.39 7.65 89.44 8.51 Comparative Example 2 92.73 7.53 89.84 8.44 Comparative Example 3 91.36 7.58 89.21 8.47

It can be confirmed that the protective film according to Examples 1 to 3 has a light transmittance of 92.4% or more and a haze value of 7.25% or less, so that the optical characteristics are remarkably improved. As a result, the transparent conductive film to which the protective film is applied has excellent optical properties It is possible to visually confirm whether or not the conductive layer is defective immediately, so that the ease of the manufacturing process can be expected.

On the other hand, the protective films according to Comparative Examples 1 and 3 had poor light characteristics because the light transmittance was less than 92.4% and the haze value was more than 7.5%. The protective film according to Comparative Example 2 had excellent light transmittance, Value is very high as 7.53%. As a result, the transparent conductive film to which the protective film according to Comparative Examples 1 to 3 was applied had an apparent appearance that it was cloudy, and it was impossible to visually confirm whether or not the conductive layer was defective.

100: transparent conductive film
110: transparent plastic substrate
120: conductive layer
130: protective film

Claims (11)

A protective film sequentially formed of a polyethylene (PE) based sheet; A conductive layer; And a transparent plastic substrate,
The protective film has a light transmittance of 92.4% or more and a haze value measured according to ASTM D1003-97 for a 45 탆 thick film of 7.25% or less
Transparent conductive film.
The method according to claim 1,
The protective film has a thickness of 40 to 50 mu m
Transparent conductive film.
The method according to claim 1,
The transparent plastic substrate has a thickness of 20 to 1000 mu m
Transparent conductive film.
The method according to claim 1,
The transparent plastic substrate may include at least one selected from the group consisting of PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PES (polyethersulfone), PC (poly carbonate), PP (polypropylene), norbornene-
Transparent conductive film.
The method according to claim 1,
The conductive layer has a thickness of 5 to 200 mu m
Transparent conductive film.
The method according to claim 1,
The conductive layer may include at least one selected from the group consisting of indium tin oxide (ITO), fluorine-doped tin oxide (FTO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide (AZO), antimony tin oxide ATO), and combinations thereof. ≪ RTI ID = 0.0 >
Transparent conductive film.
The method according to claim 1,
Further comprising an undercoat layer interposed between the transparent plastic substrate and the conductive layer
Transparent conductive film.
8. The method of claim 7,
Wherein the undercoat layer comprises silicon oxide (SiOx), silicon nitride (SiON) or niobium oxide (NbOx)
Transparent conductive film.
8. The method of claim 7,
Further comprising a hard coating layer interposed between the transparent plastic substrate and the undercoat layer
Transparent conductive film.
10. The method of claim 9,
Wherein the hard coat layer comprises at least one selected from the group consisting of an acrylic resin, a urethane resin, an epoxy resin, a siloxane resin, a melamine resin,
Transparent conductive film.
A touch screen panel comprising the transparent conductive film according to any one of claims 1 to 10.

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