KR20150037999A - Color tone correction film and transparent conductive film obtained using same - Google Patents

Abstract

The color tone correcting film has a hard coat layer laminated on both sides of a transparent base film, and a first color tone correcting layer and a second color toning correcting layer are laminated on the both hard coat layers in this order. Wherein the first hard coating layer has a refractive index of 1.51 to 1.61 and the first hard coating layer has a film thickness of 1 to 10 mu m with respect to light having a wavelength of 400 nm and the first color tone correcting layer comprises metal oxide fine particles and an active energy ray curable resin, The first hue correction layer has a refractive index of 1.63 to 1.86 for light of 400 nm and a thickness of the first hue correction layer is 25 to 90 nm, And the second positive tone correcting layer has a refractive index of 1.33 to 1.53 with respect to light having a wavelength of 400 nm and the second positive tone correcting layer has a thickness of 10 nm to 55 nm.

Description

TECHNICAL FIELD [0001] The present invention relates to a color tone correcting film, and a transparent conductive film using the color tone correcting film.

The present invention relates to a color tone correcting film for a touch panel, and a transparent conductive film comprising a tin-doped indium oxide layer as a transparent conductive layer on both sides thereof.

At present, a touch panel is widely used as a device capable of inputting information by directly contacting an image display section. In a general touch panel, an input device that transmits light is disposed on a display screen such as a liquid crystal display device. As a typical type of touch panel, there is a capacitive touch panel using a change in current capacity generated between a transparent electrode and a finger.

In the capacitive touch panel, usually, two transparent conductive films are used as transparent electrodes. A pair of transparent conductive films on which a transparent conductive layer is laminated on a transparent base film is bonded with an adhesive layer interposed therebetween such that the transparent base films face each other. As a transparent conductive film for a touch panel, a transparent conductive layer made of a metal oxide such as indium oxide (tin-doped indium oxide, ITO) or zinc oxide containing tin oxide is laminated on a transparent base film. In such a transparent conductive film, reflection and absorption in the metal oxide layer cause a decrease in the transmittance in the visible light short wavelength region, so that the total light transmittance is low and the film is often yellow. Therefore, there is a problem that it is difficult to accurately express the color of the display device disposed under the touch panel.

In order to solve this problem, a transparent conductive film in which a transparent conductive layer is combined with a multilayer optical film has been proposed (see Japanese Patent Laid-Open Publication No. 2011-98563). The transparent conductive film described in Japanese Laid-Open Patent Publication No. 2011-98563 includes a high refractive index layer, a low refractive index layer and a tin-doped indium oxide layer laminated in this order from the surface of a polyester film as a transparent substrate film. The high refractive index layer is formed of metal oxide fine particles and an ultraviolet ray curable binder. The refractive index of the high refractive index layer at a wavelength of 400 nm of light is 1.63 to 1.86 and the film thickness of the high refractive index layer is 40 to 90 nm. The refractive index of the low refractive index layer at a wavelength of 400 nm of light is 1.33 to 1.53, and the film thickness of the low refractive index layer is 10 to 50 nm. The refractive index of the tin-doped indium oxide layer at a wavelength of 400 nm of light is 1.85 to 2.35, and the thickness of the tin-doped indium oxide layer is 5 to 50 nm. This transparent conductive film realizes the effect of reducing the coloring of transmitted light by the above-described characteristics. However, in the case of using two transparent conductive films as the transparent electrode for the capacitive touch panel, there is a problem that the total light transmittance is lowered because absorption of light by the adhesive layer and the two substrates for bonding the film is increased.

It is therefore an object of the present invention to provide a transparent conductive film which suppresses the coloring of transmitted light and has a high total light transmittance and a color tone correcting film used as the base film.

In a first aspect of the present disclosure, there is provided a color tone correcting film comprising a transparent substrate film and a hard coat layer laminated on both sides thereof, wherein the first color tone correcting layer and the second color tone correcting layer are laminated in this order on the both hard coat layers, Wherein the refractive indices of the both hard coat layers with respect to light having a wavelength of 400 nm are 1.51 to 1.61 and the thicknesses of the both hard coat layers are 1 to 10 占 퐉 and the both first color tone correcting layers are made of metal oxide fine particles Wherein the refractive index of the first first color tone correcting layer with respect to light having a wavelength of 400 nm is from 1.63 to 1.86, the film thickness of both first color tone correcting layers is from 25 to 90 nm, The second second color tone correcting layer is made of silica fine particles and an active energy ray curable resin and the refractive index of the positive second color tone correcting layer with respect to light having a wavelength of 400 nm is 1.33 to 1.53, It is the thickness of the layer 10 ㎚ ~ 55 ㎚.

In the second aspect of the present disclosure, there is provided a transparent conductive film in which a tin-doped indium oxide layer is laminated on the both second color tone correcting layers of the color tone correcting film related to the first aspect, The indium tin oxide indium layer has a refractive index of 1.85 to 2.35 and the indium tin oxide indium layer has a thickness of 5 to 50 nm.

Since the color tone correcting film of the present disclosure has a color tone correcting layer on both sides of one transparent base film, the transparent electrode for a touch panel can be constituted by laminating a transparent conductive layer on both sides of one color tone correcting film. A conventional transparent electrode for a general touch panel is constituted by adhering two sheets of a transparent conductive film in which a color tone correction layer and a tin-doped indium oxide layer (transparent conductive layer) are laminated on one surface of a transparent base film with an adhesive. On the other hand, by using the color tone correcting film of the present disclosure for a transparent electrode, it becomes possible to reduce the pressure-sensitive adhesive to be used for bonding and one transparent base film. Therefore, the absorption of the transmitted light caused by the pressure-sensitive adhesive or the transparent base film can be suppressed, and the total light transmittance can be improved. In addition, since the transparent conductive film of the present disclosure has a tin-doped indium oxide layer having specific properties on both surfaces of the color tone correcting film, the total light transmittance can be improved similarly to the color tone correcting film, .

In the transparent conductive film of the present disclosure, the refractive index of the first color tone correcting layer with respect to light having a wavelength of 400 nm is 1.63 to 1.86, the film thickness of the first color tone correcting layer is 25 to 90 nm, The refractive index of the second color tone correction layer is 1.33 to 1.53, the thickness of the second color tone correction layer is 10 to 55 nm, the refractive index of the tin-doped indium oxide layer with respect to light with a wavelength of 400 nm is 1.85 to 2.35, The film thickness of the tin-doped indium oxide layer is set to 5 to 50 nm. By appropriately setting the refractive index and the film thickness of the first color tone correcting layer, the second color tone correcting layer and the tin-doped indium oxide layer as described above, the coloring of the transmitted light can be suppressed. Note that the film thickness in the present disclosure is the physical film thickness, not the optical film thickness.

Next, the reason for using the refractive index for light having a wavelength of 400 nm will be described. The refractive index has a wavelength dispersibility, and the refractive index tends to increase in a short wavelength region. Generally, in adjusting the refractive index of each layer, a value of D line of sodium (wavelength of light 589 nm) is often used. However, in the layer containing the metal oxide fine particles such as the color tone correction layer and the tin-doped indium oxide layer of the present disclosure, the influence of the wavelength dispersion of the refractive index becomes large. Since the transmittance control of a wavelength of 400 nm is important to suppress yellowishness, when the refractive index of each layer is adjusted based on the refractive index at a wavelength of 589 nm, the transmittance at a wavelength of 400 nm can not be sufficiently adjusted, It is not sufficiently obtained. In this embodiment, by designing each layer using a refractive index of 400 nm, the effect of suppressing the coloring of the transmitted light is maximized.

<Tint Correction Film>

The color tone correction film of this embodiment has a structure in which a hard coat layer, a first color tone correction layer, and a second color correction layer are laminated in this order on both surfaces of a transparent base film. That is, the color tone correcting film is formed from the top in such a manner that the second color tone correcting layer 1, the first color tone correcting layer 1, the hard coat layer 1, the transparent base film, the hard coat layer 2, The first color tone correcting layer 2, and the second color tone correcting layer 2 are laminated in this order. The components of the tint correction film will be described below in order.

&Lt; Transparent substrate film &

As the transparent base film, a film made of polyester resin, polycarbonate resin, triacetylcellulose resin, norbornene resin, or cycloolefin resin can be used. As the film made of polyester resin, PET film (Lumirror U-403) manufactured by Toray Industries, Inc. and the like can be mentioned. As the film made of polycarbonate resin, polycarbonate film (PC-2151) manufactured by Teijin Kasei Co., Ltd. and the like can be mentioned. As the film made of triacetylcellulose resin, triacetylcellulose film (Fujitac) manufactured by Fuji Film Co., Ltd. and the like can be mentioned. Examples of the film made of the norbornene resin include Aton film manufactured by JSR Corporation. Examples of the film made of the cycloolefin resin include ZEO NOA FILM (ZF14, ZF16) manufactured by Nippon Zeon Co., Ltd. and the like.

The thickness of the transparent base film is usually about 25 to 400 mu m, preferably about 25 to 200 mu m. When the transparent base film is formed of PET resin, the refractive index of the transparent base film with respect to light having a wavelength of 400 nm is 1.72.

<Hard coat layer>

On both sides of the transparent base film, a hard coat layer is formed to improve the surface hardness. When a conventional transparent conductive film is used as a transparent electrode for a touch panel, since two transparent conductive films to be bonded to each other have transparent base films, sufficient strength is ensured by the two transparent base films. On the other hand, the color tone correction film of the present embodiment has one transparent base film, and a transparent conductive film to be a transparent electrode is formed by laminating a transparent conductive layer (tin-doped indium oxide layer) on both surfaces of the color tone correction film. Therefore, in the color tone correction film of the present embodiment or a transparent conductive film described later, it is desirable that the strength of the transparent electrode is lowered by decreasing the number of the transparent base film from the conventional two to one, The strength can be maintained.

As the material of the hard coat layer, known actinic radiation ray curable resin conventionally used for the hard coat layer of various optical films disposed on the surface of the touch panel can be used, and is not particularly limited. For example, a cured product obtained by curing a hard coat layer coating liquid obtained by mixing a reactive silicon compound such as tetraethoxysilane and an active energy ray curable resin with an active energy ray such as ultraviolet (UV) or electron beam . Examples of the active energy ray curable resin include monofunctional (meth) acrylate and polyfunctional (meth) acrylate. From the standpoint of achieving both productivity and hardness, it is preferable that the composition is a cured product of an active energy ray-curable resin which has a pencil hardness (evaluation method: JIS-K5600-5-4) of not less than H. The composition containing such an active energy ray-curable resin may be, for example, a composition obtained by mixing two or more kinds of known active energy ray-curable resins, a composition commercially available as an ultraviolet curable hard coat material, A composition in which other components are further added can be used as long as it does not impair the effect of the present invention. Further, "(meth) acrylate" refers to acrylate and methacrylate.

The hard coat layer includes a photopolymerization initiating system. The photopolymerization initiator is used as a polymerization initiator when a coating film for a hard coat layer is cured by an active energy ray such as ultraviolet (UV) to form a coating film. As the photopolymerization initiator, known compounds which initiate polymerization by irradiation with active energy rays can be used, and there is no particular limitation. Methyl-1 - [4- (methylthio) phenyl] -2-morpholinocyclohexyl phenyl ketone, 2-hydroxy- An acetophenone-based polymerization initiator such as perinopropane-1-one and 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy- Benzophenone, [4- (methylphenylthio) phenyl] phenylmethanone, 4-hydroxybenzophenone, 4-hydroxybenzophenone, 4- Benzophenone-based polymerization initiators such as phenylbenzophenone and 3,3 ', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, 2-chlorothioxanthone, 2,4-diethylthioxanthone Based polymerization initiator, and the like.

The photopolymerization initiator is contained in the hard coat layer in an amount of 0.1 to 10 parts by weight. When the content of the photopolymerization initiator is less than 0.1 part by weight, the curing of the active energy ray curable resin becomes insufficient. On the other hand, if the content of the photopolymerization initiator exceeds 10 parts by weight, the photopolymerization initiator becomes unnecessarily large, which is not preferable.

The refractive index of the hard coat layer with respect to light having a wavelength of 400 nm is adjusted to be 1.51 to 1.61. When the refractive index is less than 1.51, the difference in refractive index between the transparent base film and the hard coat layer becomes large, and an interference fringe is generated. When the refractive index is larger than 1.61, it is necessary to add a high refractive index material to the hard coat layer in order to increase the refractive index. However, absorption of light and scattering of light due to the high refractive index material occur, and the hard coat layer is colored , The total light transmittance is lowered. The hard coat layer after drying and curing has a thickness of 1 to 10 mu m. When the film thickness is thinner than 1 占 퐉, the pencil hardness becomes less than H, which is not preferable. When the film thickness is thicker than 10 占 퐉, curl due to curing shrinkage becomes strong and unnecessarily thickens, resulting in deteriorated productivity and workability.

The color tone correction film of the present embodiment has two hard coat layers, that is, a hard coat layer 1 and a hard coat layer 2. The thickness and the refractive index of these two hard coat layers may be the same or different from each other within the above range.

<First Tone Correction Layer>

The first color tone correcting layer is a high refractive index layer having a higher refractive index than the hard coat layer and the second color correcting layer. The first color tone correcting layer is formed by mixing the first color toning correction layer coating liquid obtained by mixing metal oxide fine particles (which are positively increased) adjusting the refractive index of the first color toning correction layer and active energy ray hardening type resin as a binder into an active energy ray For example, ultraviolet rays or electron beams). As the metal oxide fine particles, titanium oxide and zirconium oxide are preferable. The refractive index of titanium oxide or zirconium oxide with respect to light having a wavelength of 400 nm differs depending on the production method, but is preferably from 1.9 to 3.0. The active energy ray curable resin used as the binder preferably has a refractive index of 1.4 to 1.7 with respect to light having a wavelength of 400 nm. Examples of the active energy ray curable resin include monofunctional (meth) acrylate and polyfunctional (meth) acrylate.

Further, the first color tone correction layer contains a photopolymerization initiation system. The photopolymerization initiator may be the same as the photopolymerization initiator used in the hard coat layer.

The first color tone correcting layer is formed so that the refractive index with respect to light having a wavelength of 400 nm is 1.63 to 1.86 by appropriately selecting metal oxide fine particles and active energy ray curable resin. The film thickness of the first color tone correcting layer after drying and curing is required to be 25 to 90 nm. When the refractive index of the first color tone correcting layer is less than 1.63, the value of b * of the transmission color in the L * a * b coloring system prescribed in JIS Z 8729 becomes large and the yellow color of the transmission color of the transparent conductive film becomes clear . When the refractive index of the first color tone correcting layer is larger than 1.86, the proportion of particles in the coating film increases, and the haze value increases, so the total light transmittance decreases. When the film thickness of the first color tone correcting layer is out of the above range, the value of b * becomes large, and the coloration of the yellow color of the transmission color of the transparent conductive film is clearly recognized.

The color tone correcting film of the present embodiment has two first color tone correcting layers, that is, a first color correcting layer 1 and a first color correcting layer 2. [ The film thicknesses and the refractive indexes of these two first color tone correcting layers may be equal to or different from each other within the above range.

<Second Tone Correction Layer>

The second color correction layer is a low refractive index layer having a lower refractive index than the hard coat layer and the first color correction layer. The second color tone correcting layer is formed by coating the second color toning correction layer coating liquid obtained by mixing silica fine particles (which are positively lowering) adjusting the refractive index of the second color tone correcting layer and active energy ray hardening type resin as a binder with an active energy ray For example, ultraviolet rays, electron rays). As the silica fine particles, colloidal silica and hollow silica fine particles are preferable. The refractive index of the colloidal silica or the hollow silica fine particles with respect to the light having a wavelength of 400 nm is preferably from 1.25 to 1.50 though it differs depending on the production method. The active energy ray curable resin used as the binder preferably has a refractive index of 1.4 to 1.7 with respect to light having a wavelength of 400 nm. Examples of the active energy ray curable resin include monofunctional (meth) acrylate and polyfunctional (meth) acrylate.

Further, the first color tone correction layer contains a photopolymerization initiation system. The photopolymerization initiator may be the same as the photopolymerization initiator used in the hard coat layer.

The second color correction layer is formed so that the refractive index with respect to the light having a wavelength of 400 nm is 1.33 to 1.53 by suitably selecting the silica fine particles and the active energy ray curable resin. It is also necessary that the film thickness of the second color tone correcting layer after drying and curing is 10 to 55 nm. When the refractive index of the second color tone correcting layer is less than 1.33, the proportion of particles in the coating film increases, and the haze value increases, whereby the total light transmittance decreases. When the refractive index of the second color tone correcting layer is larger than 1.53, the value of b * of the transmission color in the L * a * b coloring system specified in JIS Z 8729 becomes large and the yellow of the transmission color of the transparent conductive film The beauty is recognized clearly. When the film thickness of the second color tone correcting layer is out of the above range, the value of b * becomes large and the coloring of the yellow color of the transmission color of the transparent conductive film is clearly recognized.

The color tone correcting film of the present embodiment has two second color tone correcting layers, that is, a second color tone correcting layer 1 and a second color correcting layer 2. [ The film thicknesses and the refractive indexes of the two second color tone correcting layers may be equal to or different from each other within the above range.

&Lt; Formation of hard coat layer, first color tone correcting layer and second color tone correcting layer &gt;

The hard coat layer is formed by applying a coating liquid for a hard coat layer to a transparent base film, and then curing the coating liquid by irradiation with active energy rays. On the other hand, the first color tone correcting layer is formed by applying the coating liquid for the first color tone correcting layer onto the formed hard coat layer and then curing the coating liquid by irradiation with active energy rays. The second color tone correcting layer is formed by applying a coating solution for a second color correcting layer on the formed first color correcting layer and then curing the coating solution by active energy ray irradiation. The coating method of the coating liquid for the hard coat layer, the coating liquid for the first color tone correcting layer and the coating liquid for the second color tone correcting layer is not particularly limited, and examples thereof include a roll coating method, a spin coating method, a dip coating method, a spray coating method, A knife coating method, a die coating method, an ink jet method, and a gravure coating method. The type of the active energy ray is not particularly limited, but ultraviolet rays are preferably used from the viewpoint of convenience and the like. Further, in order to improve the adhesion of the hard coat layer, the surface of the transparent base film may be subjected to a pretreatment such as a corona discharge treatment in advance.

&Lt; Transparent conductive film &

The transparent conductive film has a structure in which a tin-doped indium oxide layer is laminated on each of the second color tone correcting layers of the color tone correcting film. That is, the transparent conductive film includes a tin-doped indium oxide layer 1, a second color tone correcting layer 1, a first color tone correcting layer 1, a hard coat layer 1, A first color tone correcting layer 2, a second color tone correcting layer 2, and a tin-doped indium oxide layer 2. The first color tone correcting layer 2,

The coloring of the transparent light of the transparent conductive film can be evaluated by b * of the Lab color system prescribed in JIS Z 8729. Preferably -2? B *? 2, more preferably -1? B *? 1. When b * &gt; 2, the transparent conductive film is colored in yellow and thus is not preferable. On the other hand, in the case of b * &lt; -2, the transparent conductive film is colored in blue and thus is not preferable.

The total light transmittance of the transparent conductive film is preferably 85% or more, and more preferably 86% or more. When the total light transmittance is less than 85%, the visibility is deteriorated, which is not preferable.

<Tin-doped indium oxide layer (ITO layer)>

The tin-doped indium oxide layer (ITO layer) laminated on both the second color tone correcting layers is a transparent conductive layer. It is preferable that the refractive index of the tin-doped indium oxide layer with respect to light having a wavelength of 400 nm is larger than the refractive index of the second color tone correcting layer. Specifically, the refractive index for light having a wavelength of 400 nm is 1.85 to 2.35. If the refractive index is out of this range, the optical interference with the first color tone correcting layer and the second color tone correcting layer does not act properly, so that the transmission color of the transparent conductive film is colored and the total light transmittance is also lowered. The ITO layer has a film thickness of 5 to 50 nm. When the film thickness is thinner than 5 nm, it is difficult to uniformly form a film, and stable resistance can not be obtained, which is not preferable. In addition, when the film thickness is larger than 50 nm, absorption of light by the ITO layer itself becomes strong, the effect of reducing the coloring of the transmission color is weakened, and the total light transmittance tends to be small.

<Formation of tin-doped indium oxide layer>

The method of forming the tin-doped indium oxide layer is not particularly limited, and for example, a vapor deposition method, a sputtering method, an ion plating method, and a CVD method can be employed. Of these, the deposition method and the sputtering method are particularly preferable from the viewpoint of controlling the thickness of the layer. Further, after the tin-doped indium oxide layer is formed, it may be crystallized by annealing in a range of 100 ° C to 200 ° C, if necessary. Specifically, the refractive index of the tin-doped indium oxide layer tends to decrease when crystallized at a high temperature. Therefore, the refractive index of the tin doped indium oxide layer can be adjusted by controlling the temperature and time of the annealing treatment.

The transparent conductive film of this embodiment has two tin-doped indium oxide layers, that is, a tin-doped indium oxide layer (1) and a tin-doped indium oxide layer (2). The film thickness and the refractive index of these two tin-doped indium oxide layers may be equal to or different from each other within the above-mentioned range.

Example

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the scope of these Examples. The refractive indexes of the layers other than the ITO layer in each example were measured by the following methods.

&Lt; Refractive index (layer other than ITO layer) &gt;

(1) A coating solution for each layer was applied onto a PET film (trade name &quot; A4100 &quot;, product of Toyo Boseki Co., Ltd.) having a refractive index of 1.72 for light with a wavelength of 400 nm by a dip coater (manufactured by Sugiyama Denki Kikai Kikai Co., Ltd.) And the thickness of the layer was adjusted so as to be about 100 to 500 nm in film thickness.

(2) After drying, the film was cured by irradiation with ultraviolet rays of 400 mJ using a 120 W high-pressure mercury lamp under an atmosphere of nitrogen by an ultraviolet irradiator (manufactured by Iwasaki Electric Co., Ltd.). The back surface of the cured PET film was roughened with sand paper and the reflection spectrum was measured by a reflection spectroscopic film thickness meter (FE-3000, manufactured by Otsuka Electronics Co., Ltd.), which was filled with black paint.

(3) From the reflectance read from the reflection spectrum, a constant of n-Cauchy wavelength dispersion formula (formula 1) shown below was obtained, and the refractive index at a wavelength of 400 nm was determined.

N (?) = A /? ⁴ + b /? ² +

(N: refractive index,?: Wavelength, a, b, c: wavelength dispersion constant)

[Preparation of coating liquid (HC-1) for hard coat layer]

96 parts by mass of dipentaerythritol hexaacrylate, 4 parts by mass of a photopolymerization initiator (trade name: IRGACURE 184, manufactured by Chiba Specialty Chemicals Co., Ltd.) and 100 parts by mass of isobutyl alcohol were mixed to obtain a hard coat layer coating solution (HC- 1) was prepared. The refractive index of the hard coat layer formed using the hard coat layer coating liquid (HC-1) was 1.52.

[Preparation of coating liquid (HC-2) for hard coat layer]

, 96 parts by mass of dipentaerythritol hexaacrylate, 5 parts by mass of acrylic fine particles (trade name: MA-150, manufactured by Soken Chemical Co., Ltd.), 1 part by mass of a photopolymerization initiator (trade name: IRGACURE 184, manufactured by Chiba Specialty Chemicals Co., , And 100 parts by mass of isobutyl alcohol were mixed to prepare a hard coat layer coating (HC-2). The refractive index of the hard coat layer formed using the coating solution for hard coat layer (HC-2) was 1.53.

[Preparation of Coating for First Color Tone Correction Layer]

The following raw materials were used as the first color tone correction layer coating liquid, and the respective raw materials were mixed in the composition shown in Table 1 to prepare the first color toning correction layer coatings C1-1 to C1-4. Further, the numerical values showing the blending ratios of the respective raw materials in Table 1 are parts by weight.

Metal oxide fine particles: Zirconium oxide fine particles having an average particle diameter of 0.02 mu m

                     Titanium oxide fine particles having an average particle diameter of 0.02 mu m

Active energy ray-curable resin: 6-functional urethane acrylate (Purple UV-7600B manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)

Photopolymerization initiator: IRGACURE 184 (I-184) manufactured by Chiba Specialty Chemicals Co.,

Solvent: methyl isobutyl ketone

The refractive indices of the color tone correction layers formed using the obtained first color toning correction layer coatings C1-1 to C1-4 were measured by the above method. The results are shown in Table 1.

[Preparation of Coating for Second Color Tone Correction Layer]

The following raw materials were used as the second color tone correction layer coating liquid, and the respective raw materials were mixed in the composition shown in Table 2 to prepare the second color tone correcting layer coatings C2-1 to C2-5. The numerical values representing the mixing ratios of the respective raw materials in Table 1 are parts by weight.

Silica fine particles: manufactured by Nikki Catalysts Co., Ltd. Acrylic modified hollow silica fine particles Surulia NAU

: XBA-ST manufactured by Nissan Chemical Industries, Ltd.

Metal oxide fine particles (for comparative example): zirconium oxide fine particles having an average particle diameter of 0.02 占 퐉

Active energy ray-curable resin: DPHA (manufactured by Nippon Yakiniku Co., Ltd.)

Photopolymerization initiator: IRGACURE 907 (I-907) manufactured by Chiba Specialty Chemicals Co.,

Solvent: Isopropyl alcohol

The refractive indices of the color tone correction layers formed using the obtained second color tone correction layer coatings C2-1 to C2-5 were measured by the above method. The results are shown in Table 2.

(Example 1-1)

A hard coat layer coating (HC-1) was coated on one surface of a PET film (product name: U-403, film thickness: 125 탆, refractive index 1.72) manufactured by Toray Industries, Inc. with a bar coater, mJ of ultraviolet rays to cure the hard coat layer 1 having a thickness of 2.5 占 퐉 after drying and curing. Subsequently, a hard coat layer coating liquid (HC-2) was coated on the other surface of the PET film with a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high-pressure mercury lamp to cure the hard coat layer, Layer 2 was formed.

The first color tone correcting layer coating liquid (C1-1) was coated on the hard coat layer (1) with a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high-pressure mercury lamp to cure the film, The first color tone correcting layer 1 was formed. Subsequently, the first color tone correcting layer coating liquid (C1-1) was coated on the hard coat layer 2 with a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high-pressure mercury lamp to measure the film thickness after drying and curing A first color tone correcting layer 2 having a thickness of 55 nm was formed.

The second color tone correcting layer coating liquid (C2-1) was coated on the first color tone correcting layer (1) by a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high pressure mercury lamp to measure the film thickness after drying and curing A second color tone correcting layer 1 having a thickness of 30 nm was formed. Subsequently, the second color tone correcting layer coating liquid (C2-1) was coated on the first color tone correcting layer (2) by a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high pressure mercury lamp to cure the film A second color tone correcting layer 2 having a thickness of 30 nm was formed to prepare a color tone correcting film (S-1).

(Example 1-2)

A color tone correcting film (S-2) was produced in the same manner as in Example 1-1 except that the thickness of the second color tone correcting layer 1 after drying and curing was 10 nm.

(Example 1-3)

A color tone correcting film (S-3) was produced in the same manner as in Example 1-1 except that the thickness of the second color tone correcting layer 1 after drying and curing was 55 nm.

(Examples 1-4)

A color tone correcting film (S-4) was produced in the same manner as in Example 1-1 except that the coating liquid for the second color tone correcting layer of the second color tone correcting layer 1 was C2-2.

(Example 1-5)

A color tone correcting film (S-5) was produced in the same manner as in Example 1-1 except that the coating for a second color tone correcting layer of the second color tone correcting layer 1 was changed to C2-3.

(Examples 1-6)

A color tone correcting film (S-6) was produced in the same manner as in Example 1-1 except that the thickness of the first color tone correcting layer 1 after drying and curing was 25 nm.

(Example 1-7)

A color tone correcting film (S-7) was produced in the same manner as in Example 1-1 except that the film thickness of the first color tone correcting layer 1 after drying and curing was 90 nm.

(Examples 1-8)

A color tone correcting film (S-8) was produced in the same manner as in Example 1-1 except that the coating for the first color toning correction layer of the first color toning correction layer 1 was changed to C1-2.

(Examples 1-9)

A color tone correcting film (S-9) was produced in the same manner as in Example 1-1 except that the coating for a first color toning correction layer of the first color toning correction layer 1 was changed to C1-3.

(Examples 1-10)

Same as Example 1-1 except that the hard coat layer hard coating layer 1 and the hard coating layer coating liquid were made of HC-3 (trade name: Lucifural NAB-2000, manufactured by Nippon Paint Co., Ltd.) To prepare a color tone correcting film (S-10). The refractive index of the hard coat layer formed using the coating solution for hard coat layer (HC-3) was 1.54.

(Example 1-11)

C1-2 is used as the first tincture correction layer coating liquid of the first color tone correcting layer 1 to set the film thickness after dry curing to 25 nm and the coating for the first color tone correcting layer 2 of C1 -3 was used to set the film thickness after the dry curing to 90 nm and the film thickness after the dry curing was set to 10 nm by using C2-3 in the second color tone correcting layer coating liquid of the second color tone correcting layer 1 And C2-2 was used as the second color tone correcting layer coating liquid of the second color tone correcting layer 2 to set the film thickness after drying and curing to 55 nm. S-11).

(Example 1-12)

A color tone correcting film (S) was prepared in the same manner as in Example 1-1 except that the transparent base film was changed to a cycloolefin resin film, Zeonoa Film (product name: ZF14, thickness: 100 탆, refractive index: 1.55) manufactured by Nippon Zeon Co., -12).

(Example 1-13)

A color tone correcting film (S-13) was obtained in the same manner as in Example 1-1 except that the transparent base film was changed to a polycarbonate film (product name: PC-2151, film thickness: 125 탆, refractive index: 1.61) manufactured by Teijin Kasei ).

Properties of the color tone correcting films obtained in Examples 1-1 to 1-13 are shown in Table 3.

(Example 2-1)

Sputtering was performed on the second color tone correcting layer 1 of the color tone correcting film (S-1) using an ITO target of indium: tin = 10: 1 to obtain a tin doped indium oxide layer (ITO Doped indium oxide layer 2 having a thickness of 20 nm is formed on the first color tone correcting layer 2 by sputtering using an ITO target of indium: tin = 10: 1 on the second color tone correcting layer 2 ) Was formed and subjected to an annealing treatment at 150 DEG C for 30 minutes to produce a transparent conductive film.

(Example 2-2)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-2).

(Example 2-3)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-3).

(Example 2-4)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-4).

(Example 2-5)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-5).

(Example 2-6)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-6).

(Example 2-7)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-7).

(Example 2-8)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-8).

(Example 2-9)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-9).

(Example 2-10)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-10).

(Examples 2-11)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-11).

(Examples 2-12)

Doped indium oxide layer (1) and the tin-doped indium oxide layer (2) were set to 30 nm and the annealing treatment was performed at 150 DEG C for 60 minutes, a transparent To prepare a conductive film.

(Examples 2-13)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the annealing treatment was conducted at 100 캜 for 60 minutes.

(Examples 2-14)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-12).

(Examples 2-15)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-13).

The refractive index, transmission color b *, and total light transmittance of the ITO layer were measured for the obtained transparent conductive film. The results are shown in Table 4 below. The refractive index, transmission color b *, and total light transmittance of the ITO layer were measured by the following methods.

&Lt; Refractive index (ITO layer) &gt;

(1) An ITO target of indium: tin = 10: 1 was sputtered on a PET film (trade name &quot; A4100 &quot;, manufactured by Toyama Bunko K.K.) having a refractive index of 1.72 for light with a wavelength of 400 nm, Doped indium oxide layer (ITO layer) as a transparent conductive layer having a thickness of 20 nm was formed on the transparent conductive film, and then annealing was performed under the conditions of each of the following examples and comparative examples to produce a transparent conductive film.

(2) The back surface of the transparent conductive film was roughened with sandpaper, and the reflection spectrum was measured by a reflection spectroscopic film thickness meter (FE-3000, manufactured by Otsuka Electronics Co., Ltd.), which was filled with black paint.

(3) From the reflectance read from the reflection spectrum, the refractive index at a wavelength of 400 nm of light was determined by using the above-mentioned (Expression 1).

The refractive indexes shown in Table 4 are refractive indices obtained from the refractive index measurement sample.

<Transmission color>

The transmission color and b * of the transparent conductive film were measured using a color difference meter (&quot; SQ-2000 &quot;, manufactured by Nippon Denshoku Kogyo Co., Ltd.). This b * is a value in the L * a * b color system prescribed in JIS Z 8729.

<Total light transmittance>

The total light transmittance (%) of the transparent conductive film was measured by a haze meter ("NDH2000", manufactured by Nippon Denshoku Kogyo Co., Ltd.).

(Comparative Example 1-1)

A hard coat layer coating liquid (HC-1) was coated on a PET film (product name: U-403, manufactured by Toray Co., Ltd., film thickness: 125 μm) with a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high- Followed by curing to form a hard coat layer having a thickness of 2.5 mu m after the dry curing. Next, the first color tone correcting layer coating liquid (C1-1) was coated on the hard coat layer with a bar coater and irradiated with ultraviolet rays of 400 mJ with a 120 W high-pressure mercury lamp to be cured, whereby the film thickness after drying curing was 55 nm A second color tone correcting layer coating liquid (C2-1) was coated on the first color tone correcting layer by a bar coater, and irradiated with ultraviolet rays of 400 mJ with a 120 W high pressure mercury lamp to cure the first color tone correcting layer , And a second color tone correcting layer having a film thickness of 30 nm after dry-curing was formed to prepare a color tone correcting film.

Next, an indium tin oxide indium layer was formed as a transparent conductive layer by sputtering using an ITO target of indium: tin = 10: 1 on the second color tone correcting layer of the color tone correcting film. Annealing treatment was performed to produce a transparent conductive film. Two transparent conductive films thus obtained were bonded to each other via PET films with a transparent adhesive transfer tape (trade name: 8146-2, manufactured by Sumitomo 3M Co., Ltd.) so that the transparent conductive film of Comparative Example 1-1 . With respect to the obtained transparent conductive film, the refractive index, transmission color b *, and total light transmittance of the ITO layer were measured by the above-mentioned method. The results are shown in Table 5.

(Comparative Example 2-1)

A color tone correcting film (S-14) was produced in the same manner as in Example 1-1 except that the film thickness of the second color tone correcting layer 1 after drying and curing was 60 nm.

(Comparative Example 2-2)

A color tone correcting film (S-15) was produced in the same manner as in Example 1-1 except that the coating for a second color tone correcting layer of the second color tone correcting layer 1 was changed to C2-4.

(Comparative Example 2-3)

A color tone correcting film (S-16) was produced in the same manner as in Example 1-1 except that the coating liquid for the second color tone correcting layer of the second color tone correcting layer 1 was C2-5.

(Comparative Example 2-4)

A color tone correcting film (S-17) was produced in the same manner as in Example 1-1 except that the thickness of the first color tone correcting layer 1 after drying and curing was 20 nm.

(Comparative Example 2-5)

A color tone correcting film (S-18) was produced in the same manner as in Example 1-1 except that the film thickness of the first color tone correcting layer 1 after drying and curing was 95 nm.

(Comparative Example 2-6)

A color tone correcting film (S-19) was produced in the same manner as in Example 1-1 except that the coating for a first color tone correcting layer of the first color toning correction layer 1 was changed to C2-5.

(Comparative Example 2-7)

A color tone correcting film (S-20) was produced in the same manner as in Example 1-1 except that the coating for a first color tone correcting layer of the first color tone correcting layer 1 was changed to C1-4.

Properties of the color tone correcting films obtained in Comparative Examples 2-1 to 2-7 are shown in Table 6.

(Comparative Example 3-1)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone adjustment film was changed to (S-14).

(Comparative Example 3-2)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-15).

(Comparative Example 3-3)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-16).

(Comparative Example 3-4)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-17).

(Comparative Example 3-5)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-18).

(Comparative Example 3-6)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-19).

(Comparative Example 3-7)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the color tone correcting film was changed to (S-20).

(Comparative Example 3-8)

A transparent conductive film was produced in the same manner as in Example 2-1 except that the ITO layer 2 had a thickness of 70 nm.

With respect to the transparent conductive films obtained in Comparative Examples 3-1 to 3-8, the refractive index, transmissivity b *, and total light transmittance of the ITO layer were measured by the above method. The results are shown in Table 7.

In Examples 2-1 to 2-15, since the refractive index and the film thickness of the hard coat layer, the color tone correction layer, and the tin-doped indium oxide layer are set within the ranges specified in this disclosure, the value of the transmitted color b * The coloring of the transparent conductive film was sufficiently suppressed, and a good total light transmittance could be realized.

On the other hand, in Comparative Example 1-1, since the extra adhesive layer and the transparent base film were used, the total light transmittance was bad. In Comparative Examples 3-1 to 3-8, since either of the color tone correcting layer, the refractive index of the tin-doped indium oxide layer, and the film thickness was set outside the range defined in this disclosure, the value of the transmitted color b * The transparent conductive film was colored.

Claims (2)

A color tone correction film comprising a transparent substrate film laminated on both surfaces thereof with a hard coat layer and a first color tone correcting layer and a second color tone correcting layer laminated on the both hard coat layers,
A refractive index of the both hard coat layers with respect to light having a wavelength of 400 nm is 1.51 to 1.61, a thickness of both hard coat layers is 1 to 10 mu m,
Wherein the first first color tone correcting layer comprises metal oxide fine particles and an active energy ray curable resin and the refractive index of the both first color tone correcting layers with respect to light having a wavelength of 400 nm is 1.63 to 1.86, Has a thickness of 25 to 90 nm,
Wherein the positive second color tone correcting layer comprises silica fine particles and an active energy ray curable resin and has a refractive index of 1.33 to 1.53 for the second color tone correcting layer with respect to light having a wavelength of 400 nm, And a thickness of 10 to 55 nm. A transparent conductive film in which a tin-doped indium oxide layer is laminated on the both second color tone correcting layers of the color tone correcting film according to claim 1,
The refractive indices of the indium tin oxide indium layer for light having a wavelength of 400 nm are 1.85 to 2.35 and the indium tin oxide indium layer has a thickness of 5 to 50 nm.