KR20110037881A - Transparent conductive film - Google Patents

Abstract

PURPOSE: A transparent conductive film is provided to decrease a haze value by suppressing the discoloration of transmission light. CONSTITUTION: A transparent conductive film includes a high refractive layer, a lower refractive layer, and a tin doped indium oxide layer. The high refractive layer, the lower refractive layer, and the tin doped indium oxide layer are successively laminated on a first main surface of a polyester film. The high refractive layer is comprised of metal oxide corpuscles and an ultraviolet curable binder. The refractive index of the high refractive layer is 1.63 to 1.86. The refractive index of the low refractive index is 1.33 to 1.53. The refractive index of the tin doped indium oxide layer is 1.85 to 2.35.

Description

Transparent conductive film

TECHNICAL FIELD This invention suppresses discoloration of the transmitted light used, for example in a touch panel, and relates to the transparent conductive film excellent in the total light transmittance.

Currently, a touch panel is used as a device capable of inputting information by directly contacting an image display unit. In this touch panel, an input device that transmits light is disposed on various displays such as a liquid crystal display device and a CRT. Representative types of touch panels include a resistive touch panel in which two transparent electrode substrates are disposed so that the transparent electrode layers face each other, or a capacitive touch panel using a change in current capacitance generated between the transparent electrode layer and a finger.

Indium oxides (tin-doped indium oxide, ITO), zinc oxide, etc. containing tin oxide on substrates such as glass plates, transparent resin plates, and various thermoplastic polymer films as transparent electrode substrates of resistive touch panels and capacitive touch panels. The metal oxide of which was laminated | stacked by the transparent conductive layer is generally used. Since the transmittance | permeability fall of the visible light short wavelength area | region derived from reflection and absorption of a metal oxide layer may arise in the transparent electrode substrate obtained in this way, the light which permeate | transmitted the transparent electrode substrate may change color to yellow. Therefore, there is a problem that it is difficult to accurately express the color development of the display device disposed below the touch panel.

In order to solve this problem, the transparent conductive laminated body which combined the transparent conductive layer with the multilayer optical film is proposed (refer Unexamined-Japanese-Patent No. 2000-301648). In the multilayer optical film of the transparent conductive laminate, layers of different refractive indices are laminated. Since the hydrolyzate of the metal alkoxide is used as a component of the multilayer optical film, the effect of suppressing the discoloration of the transmissive color into yellow and the lowering of the haze value of the transparent conductive laminate are insufficient.

An object of the present invention is to provide a transparent conductive film that suppresses discoloration of transmitted light, has a low haze value, and has a high total light transmittance.

In order to achieve the above object, the transparent conductive film of one embodiment of the present invention is a high refractive index layer, a low refractive index layer, and a tin dope indium oxide layer (ITO layer), which are laminated in order from the first main surface of the polyester film. Equipped. The high refractive index layer is formed of metal oxide fine particles and an ultraviolet curable binder. The refractive index of the high refractive index layer in wavelength 400nm is 1.63-1.86. The thickness of the high refractive index layer is 40 to 90 nm. The refractive index of the low refractive index layer in wavelength 400nm is 1.33-1.53. The film thickness of the low refractive index layer is 10 to 50 nm.

The transparent conductive film of an example further has a functional layer formed in the 2nd main surface of a polyester film.

In one example, the functional layer is a hard coat layer, an antiglare layer, a fingerprint familiarity layer, or a self-repair layer.

In one example, the functional layer is an active hard coat layer. The thickness of the active hard coat layer is 1.0 to 10.0 μm. The said active hard coat layer contains 0.5-30 mass% translucent microparticles | fine-particles in this active hard coat layer. The ratio of the average particle diameter of the translucent fine particles to the film thickness of the active hard coat layer is 10 to 60%.

In one example, the functional layer is a hard coat layer or an antiglare layer, and the transparent conductive film further includes an antireflection layer laminated on the functional layer.

According to this invention, the following effects can be exhibited.

In one kind of transparent conductive film, transparent conductivity is set by suitably setting the refractive index of the high refractive index layer, the low refractive index layer, and the ITO layer laminated | stacked on the 1st main surface of a polyester film based on the refractive index in the wavelength of 400 nm of light. The transmitted light of the film turns yellow The phenomenon of discoloration can be suppressed and the transmittance can be increased. Therefore, the coloring of transmitted light is suppressed, haze value can be reduced, and the transparent conductive film which raised the total light transmittance can be obtained.

Here, there is a wavelength dispersion in the refractive index, and the refractive index tends to be high in the short wavelength region. In general, in adjusting the refractive index of each layer, the value of sodium D-line (589 nm) is mostly used. However, in the layer containing metal oxide fine particles, such as the intermediate | middle layer and ITO layer of this invention, the influence of the wavelength dispersion of a refractive index becomes large. When the refractive index of each layer is adjusted by the refractive index of wavelength 589 nm, the transmittance | permeability of wavelength 400 nm cannot fully be adjusted, and it turns yellow. The effect of reducing the phenomenon of discoloration cannot be sufficiently obtained. In the present invention, each layer was designed using a refractive index of wavelength 400 nm, and the transmittance at wavelength 400 nm was controlled. The effect of suppressing the phenomenon of discoloration is maximized.

1 is a schematic cross sectional view of a structure of a transparent conductive film according to an embodiment of the present invention.
It is typical sectional drawing which shows the structure of the transparent conductive film which has a hard-coat layer between a polyester film and a high refractive index layer.
It is typical sectional drawing which shows the structure of the transparent conductive film which has a functional layer.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment which actualized this invention is described in detail.

[Transparent Conductive Film]

The transparent conductive film of this embodiment is comprised by laminating | stacking a high refractive index layer, a low refractive index layer, and a tin dope indium oxide layer (ITO layer) in order from the 1st main surface of a polyester film (FIG. 1). Reference). The high refractive index layer is formed of metal oxide fine particles and an ultraviolet (UV) curable binder. The refractive index of the high refractive index layer at a wavelength of 400 nm is 1.63-1.86, and the film thickness of the high refractive index layer is 40-90 nm. The refractive index of the low refractive index layer at a wavelength of 400 nm is 1.33-1.53, and the film thickness of the low refractive index layer is 10-50 nm. The refractive index of the ITO layer at a wavelength of 400 nm is 1.85 to 2.35, and the film thickness of the ITO layer is 5 to 50 nm.

Hereinafter, the component of the said transparent conductive film is demonstrated in order.

<Polyester film>

The polyester film is a transparent base material and is a polyester resin represented by polyethylene terephthalate (PET) resin. The film thickness of a polyester film is 25-400 micrometers normally, Preferably it is 35-250 micrometers.

<High refractive index layer>

The high refractive index layer is formed of a cured product obtained by ultraviolet-curing the high refractive index layer liquid in which the metal oxide fine particles and the ultraviolet curable binder are mixed. As the metal oxide fine particles, titanium oxide and zirconium oxide are preferable. Although the refractive index in wavelength 400nm of titanium oxide and zirconium oxide changes with manufacturing methods, it is preferable that it is 2.0-3.0. Moreover, as an ultraviolet curable binder, the polyfunctional monomer, oligomer, and polymer which have a (meth) acryloyl group are mentioned. It is preferable that the refractive index of the ultraviolet curable binder in wavelength 400nm is 1.4-1.7.

The coating liquid of the high refractive index layer is adjusted so that the refractive index in wavelength 400nm of the cured film (namely, high refractive index layer) after dry hardening is 1.63-1.86, Preferably it is 1.66-1.86. Furthermore, the coating liquid of a high refractive index layer is apply | coated so that the film thickness after dry hardening may be 40-90 nm, Preferably it is 45-90 nm, and it hardens after that. When the refractive index and the film thickness of the high refractive index layer are outside these ranges, the value of the transmission color b * in the L * a * b color system prescribed in JIS Z 8729 becomes large, and the transmission color of the transparent conductive film discolors to yellow. The phenomenon becomes noticeable. Moreover, when the refractive index of a high refractive index layer is larger than 1.86, the ratio of the particle | grains in a coating film will increase and haze value will rise. When the film thickness of the high refractive index layer is out of the above range, the value of the transmission color b * becomes large, and the phenomenon that the transmission color of the transparent conductive film discolors to yellow is remarkably recognized.

<Low refractive index layer>

The low refractive index layer is a layer obtained by applying and curing a coating liquid in which inorganic fine particles having an average particle diameter of 10 to 100 nm and an active energy ray-curable resin are mixed with a solvent, if necessary, using a solvent. Examples of the inorganic fine particles include colloidal silica and hollow silica fine particles. As active energy ray hardening type resin, the polyfunctional monomer, oligomer, and polymer which have a (meth) acryloyl group are mentioned, for example.

The fill solution of the low refractive index layer is adjusted so that the refractive index at a wavelength of 400 nm of the cured film (that is, the low refractive index layer) after dry curing is 1.33 to 1.53. When this refractive index is smaller than 1.33, in order to increase the ratio of the hollow silica fine particles and the like in the coating liquid of the low refractive index layer, the coating film is receded and the low refractive index layer cannot be formed satisfactorily. On the other hand, when the refractive index of the low refractive index layer is larger than 1.53, the value of the transmissive color b * becomes large, and it becomes recognizable that the transmissive color of the transparent conductive film discolors to yellow.

The coating liquid of the low refractive index layer is cured after being applied such that the film thickness after dry curing is 10 to 50 nm, preferably 15 to 45 nm. If the film thickness is outside this range, the value of the transmissive color b * becomes large, and the phenomenon that the transmissive color of the transparent conductive film discolors to yellow is remarkably recognized.

<Method of forming high refractive index layer and low refractive index layer>

The formation method of the high refractive index layer and the low refractive index layer provided on a polyester film is sufficient as a conventionally well-known method, but it is not specifically limited. For example, methods, such as a dry coating method and a wet coating method, can be taken out. In view of productivity and manufacturing cost, wet coating is particularly preferred. As a wet coating method, although a well-known method is enough, a roll coating method, a spin coating method, a dip coating method, etc. are mentioned as a typical method, for example. Among them, a method capable of forming a layer continuously, such as a roll coating method, is preferable from the viewpoint of productivity.

<ITO layer>

The ITO layer is laminated on the low refractive index layer. The refractive index of the ITO layer at a wavelength of 400 nm is 1.85 to 2.25, preferably 1.90 to 2.30. When the refractive index of an ITO layer is out of this range, the transmissive color of a transparent conductive film will show coloring and a transmittance | permeability will also fall. Moreover, the film thickness after dry hardening of an ITO layer is 550 nm, Preferably it is 20-30 nm. If the thickness is thinner than 5 nm, it is difficult to form the ITO layer uniformly, and stable resistance cannot be obtained. On the other hand, when the film thickness is thicker than 50 nm, absorption of light by the ITO layer itself becomes strong, and the effect of reducing the phenomenon of discoloration in yellow becomes weak. The film forming method of the ITO layer is not particularly limited, and for example, a vapor deposition method, a sputtering method, an ion plating method, a CVD method (chemical vapor deposition method) or a plating method can be used. Among these methods, the vapor deposition method and the sputtering method are particularly preferable from the viewpoint of controlling the thickness of the ITO layer. On the other hand, after forming an ITO layer, it can crystallize by applying an annealing process in the range of 100-200 degreeC as needed. Specifically, when the crystallization is performed at a high temperature, the refractive index of the ITO layer tends to be small. Therefore, adjustment of the refractive index of an ITO layer can be adjusted by controlling the temperature and time of an annealing process.

<Hard coat layer>

A hard coat layer can be formed between a polyester film and a high refractive index layer (refer FIG. 2). As a hard coat layer, the hardened | cured material which carried out the ultraviolet curing of the coating liquid for hard coat layers which mixed reactive silicon compounds, such as tetraethoxy silane, and active energy ray-curable resin, is mentioned, for example. As active energy ray hardening type resin, monofunctional (meth) acrylate, polyfunctional (meth) acrylate, etc. are mentioned, for example. It is preferable that it is a polymerization hardened | cured material of the composition containing active energy ray hardening type resin from which a pencil hardness (evaluation method: JIS-K5600-5-4) becomes H or more from a viewpoint which makes productivity and hardness compatible.

Although it does not specifically limit as a composition containing such active energy ray-curable resin, For example, what mixes two or more types of well-known active energy ray-curable resin, what is marketed as an ultraviolet curable hard coat material, or this invention other than these In the range which does not impair the effect of, the thing which added other components can be used. 1.0-10.0 micrometers is preferable and, as for the film thickness of the hard-coat layer after dry hardening, it is preferable that refractive index is 1.45-1.60. When the film thickness of a hard coat layer is thinner than 1.0 micrometer, since pencil hardness becomes less than H, it is unpreferable. On the other hand, when the film thickness is thicker than 10 µm, it is not preferable because the curl due to curing shrinkage becomes strong and the thickness is unnecessarily thick, resulting in reduced productivity and workability.

The formation method of a hard coat layer is not specifically limited, Usually, the coating method normally performed, for example, the roll coating method, the spin coating method, the dip coating method, the bar coating method, the gravure coating method, etc. are used.

<Functional layer>

A functional layer can be formed in the 2nd main surface on the opposite side to the said 1st main surface of a polyester film (refer FIG. 3). This functional layer can apply any functional layer which can provide a predetermined | prescribed function to a transparent conductive film. The functional layer is, for example, a hard coat layer, a fingerprint familiarity layer, an antiglare layer, a self-repair layer, or the like. The hard coat layer may use a conventionally well-known thing, and is not specifically limited.

A fingerprint familiarity layer is a layer which shows familiarity (affinity) with respect to the fingerprint (living-derived fat component) affixed on the surface of a transparent conductive film. For example, 1 type (s) or 2 or more types are chosen and used out of a monofunctional polymer, the oligomer which has a vinyl group or a (meth) acryloyl group, and the polymer which has a vinyl group or a (meth) acryloyl group, and uses these organic solvent solutions It is a layer apply | coated, dried, and ultraviolet-curing.

An anti-glare layer is a layer which scatters light rays irradiated from an external light source such as a fluorescent lamp by surface irregularities and reduces reflection of light. This anti-glare layer is formed by forming a concave-convex shape without using particles or particles of a dispersion in which spherical or amorphous inorganic or organic fine particles having a particle diameter of several μm are dispersed in active energy ray-curable resins such as thermosetting resins and ultraviolet curable resins. It is a layer which apply | coated and hardened the coating liquid containing the polymer which is possible.

The self-repairing layer is a layer having the property of improving the writing feeling on the surface of the transparent conductive film at the time of pen input, that is, the self-repairing property, that is, the depressions that occurred once, disappears over time and returns to its original shape. As the resin for forming the self-repairing layer, unsaturated polyurethane-based resins such as ultraviolet curable or thermosetting unsaturated acrylic resins, urethane-modified (meth) acrylates, unsaturated polyester-based resins, and the like are used.

As a hard coat layer as a functional layer, an active hard coat layer (sometimes called an active hard coat layer or an active hard coat layer) can be used. The thickness of the active hard coat layer is 1.0-10.0 μm. The active hard coat layer contains 0.5 to 30% by mass of light transmitting fine particles in the active hard coat layer. The ratio of the average particle diameter of the translucent fine particles to the film thickness of the active hard coat layer is 10 to 60%. By the light-transmitting fine particles, fine irregularities are formed on the surface of the active hard coat layer, whereby good curl properties are expressed. The thickness of the active hard coat layer is more preferably 36 µm. If the thickness is thinner than 1.0 μm, the hard coat performance may be impaired, and if it is thicker than 10.0 μm, the curlability may be impaired.

The active hard coat layer contains an ultraviolet curable binder and light-transmitting fine particles, and is formed by irradiating and curing ultraviolet light to a hard coat layer coating liquid containing an additive as necessary. The material of an ultraviolet curable binder is not specifically limited, For example, hardened | cured material, such as reactive silicon compounds, such as monofunctional (meth) acrylate, polyfunctional (meth) acrylate, and tetraethoxysilane, is mentioned.

Translucent microparticles | fine-particles are for forming an unevenness | corrugation on the surface of a hard-coat layer, and expressing curlability. Arbitrary materials can be used for the said translucent microparticles | fine-particles. As such translucent microparticles | fine-particles, it is formed from the polymer etc. which are obtained by superposing | polymerizing at least 1 sort (s) of monomer chosen from vinyl chloride, a (meth) acryl monomer, styrene, and ethylene other than silica, for example. The average particle diameter of the light transmissive fine particles can be determined depending on the thickness of the hard coat layer. Preferably the ratio of the average particle diameter of the said translucent microparticles | fine-particles to the film thickness of a hard-coat layer is 10 to 60%, More preferably, it is 20 to 50%. When the ratio of this average particle diameter is smaller than 10% of the hard coat layer film thickness, and larger than 60%, there exists a possibility that a curling property may be impaired. The ratio (RP / HC) of the average particle diameter of the translucent microparticles | fine-particles with respect to the film thickness of a hard-coat layer can be calculated | required by following formula (1).

The content of the light-transmitting fine particles is preferably 0.5 to 20% by mass, more preferably 0.5 to 10% by mass, particularly preferably 3 to 5% by mass with respect to the coating liquid for hard coat layer. The hard coat layer may contain an additive, and a silicone type additive is used as such an additive. Examples of the silicone-based additives include polyether modified polydimethyl siloxane, and specifically, BYK330, BYK331, and BYK346 manufactured by BIC Chemi Japan Co., Ltd. may be mentioned. The formation method of an active hard-coat layer is not specifically limited, Usually, all the methods, such as the roll coating method, the spin coating method, the dip coating method, the bar coating method, the gravure coating method, are performed, are employ | adopted.

In this specification, the said hard-coat layer and anti-glare layer contained in a functional layer may be called a support layer. An antireflection layer or an antiglare antireflection layer can be formed on the support layer. This antireflection layer is a layer which reduces the light beam irradiated from external light sources, such as a fluorescent lamp, by the interference of light. When forming the antireflection layer of single | mono layer structure on the support layer of refractive index 1.5-1.6, the low refractive index layer which is lower than refractive index, for example, refractive index 1.3-1.5, can be laminated | stacked and formed. When the antireflection layer having a two-layer structure is formed on a support layer having a refractive index of 1.5 to 1.6, a high refractive index layer having a higher refractive index than the supporting layer, for example, a refractive index of 1.6 to 1.8 and a low refractive index layer having a lower refractive index than the high refractive index layer is used. It can be laminated | stacked and formed in a support layer in this order.

The low-refractive-index layer contained in an antireflection layer is a layer which apply | coated and hardened the coating liquid which mixed the inorganic fine particle of 10-100 nm of average particle diameter, and active energy ray-curable resin. Examples of the inorganic fine particles include colloidal silica and hollow silica fine particles. Examples of the active energy ray-curable resins include polyfunctional monomers, oligomers, and polymers having a (meth) acryloyl group.

The high refractive index layer contained in an antireflection layer is a layer which apply | coated and hardened the coating liquid which mixed the metal oxide microparticles | fine-particles whose average particle diameter is 10-100 nm, and active energy ray hardening type resin. Examples of the metal oxide fine particles include tin-doped indium oxide, titanium oxide, zirconium oxide, and the like. Examples of active energy ray-curable resins include polyfunctional monomers, oligomers, and polymers having a (meth) acryloyl group. .

The anti-glare antireflection layer is a layer having both functions of anti-glare and anti-reflection, and is formed by laminating an anti-reflection layer on the anti-glare layer.

These functional layers can be used individually, respectively, or can also be used combining them suitably.

Although the said embodiment is more concretely demonstrated to a manufacture example, an Example, and a comparative example below, this invention is not limited to the range of the Example. In addition, the refractive index of each layer was measured as follows.

<Measurement method of refractive index>

(1) On the PET film (brand name: A4100, Toyo Spinning Co., Ltd.) of refractive index 1.63, the film thickness after each dry hardening of the coating liquid for each layer by a dip coater (made by Sugiyama Hajime Chemical Co., Ltd.) is 100- The thickness of the layer was adjusted and applied so that it might be about 500 nm.

(2) After drying, the ultraviolet-ray of 400 mJ was irradiated and hardened | cured using 120 W high pressure mercury lamp under nitrogen atmosphere using the ultraviolet irradiation device (made by Iwasaki Electric Co., Ltd.). After rubbing the back of PET film after hardening with sandpaper, the thing which was fully coated with the black paint was measured for the reflection spectrum using the reflection spectroscopy film-type (model name: FE-3000, Otsuka Electronics Co., Ltd. product).

(3) From the reflectance read out from the reflection spectrum, the constant of the wavelength dispersion formula of n-Cauchy shown by following formula (2) was calculated | required, and the refractive index in wavelength 400nm was calculated | required.

A, B, C: wavelength dispersion constant

<Measurement method of refractive index>

(1) After pre-drying a PET film (trade name: A4100, manufactured by Toyo Spinning Co., Ltd.) having a refractive index of 1.63 for 1 hour at 100 ° C, an ITO target having indium: tin = 10: 1 (mass ratio) on the PET film. Sputtering was carried out, the tin dope indium oxide layer (ITO layer) was formed as a transparent conductive layer of 20 nm thick actually, and the transparent conductive film was produced.

(2) After the back surface of this transparent conductive film was rubbed with sandpaper, the paint spectrum was completely filled with black paint, and the reflection spectrum was measured using a reflective spectroscopic film thickness meter (model name: FE-3000, manufactured by Otsuka Electronics Co., Ltd.).

(3) From the reflectance read out from the reflection spectrum, the refractive index in wavelength 400nm was calculated | required using said Formula (2).

In addition, the refractive index of each layer described in the Example and the comparative example is the refractive index calculated | required from said refractive index measuring method.

<Measurement of total light transmittance, haze value>

The total light transmittance (%) and the haze value (%) were measured using the haze meter (model name: NDH2000, Nippon Color Industry Co., Ltd. product).

<Measurement of translucent color>

The transmissive color and b * were measured using the color difference meter (model name: SQ-2000, Nippon Denki Kogyo Co., Ltd. product). This b * is a value in the L * a * b color system prescribed | regulated to JISZ 8729.

<Evaluation method of curling performance>

The double-sided hard coat (HC) film was rolled off on a roll, and the roll performance was evaluated by the evaluation criteria shown below by visually observing a roll.

(Double-circle): There is no deformation | transformation of the uneven | corrugated state, such as wrinkles and concave-surface which arise at the end of a horse.

(Circle): There is almost no uneven | corrugated state deformation | transformation, such as wrinkles or concave-surface which arise at the end.

X: Uneven | corrugated state deformation | transformation, such as wrinkles or uneven surfaces which arise at the end of a horse, is large.

< Production Example  1> hard Coat layer Of seven liquid (HC-1)  pharmacy

80 parts by mass of dipentaerythritol hexaacrylate, 20 parts by mass of fresh tetramethylol methane, 20 parts by mass of 1,6-bis (3-acryloyloxy-2-hydroxypropyloxy) hexane, photopolymerization 4 parts by mass of an initiator (trade name: IRGACURE184, manufactured by Chiba Specialty Chemicals Co., Ltd.) and 100 parts by mass of isobutyl alcohol were mixed to prepare a coating liquid (HC-1) for a hard coat layer.

< Production Example  2> For high refractive index layer Of seven liquid (H-1)  pharmacy

79 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 21 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., ultraviolet light UV7600B) having 6 acryloyl groups in 1 molecule, and a photopolymerization initiator (Brand name: IRGACURE 184, Chiba Specialty Chemicals Co., Ltd.) 5 mass parts was mixed, it diluted with methyl ethyl ketone so that the said solid content might be 10 mass%, and the high refractive index layer liquid (H-1) was prepared. .

< Production Example  3> For high refractive index layer Of seven liquid (H-2)  pharmacy

72 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 28 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., magnetic light UV7600B) having 6 acryloyl groups in 1 molecule, and a photopolymerization initiator (Brand name: IRGACURE 184, Chiba Specialty Chemicals Co., Ltd.) 5 mass parts was mixed, it diluted with methyl ethyl ketone so that the said solid content might be 10 mass%, and the high refractive index layer liquid (H-2) was prepared. .

< Production Example  4> For high refractive index layer Of seven liquid (H-3)  pharmacy

86 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 14 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., ultraviolet light UV7600B) having 6 acryloyl groups in 1 molecule, and a photopolymerization initiator (Brand name: IRGACURE 184, product made by Chiba Specialty Chemicals Co., Ltd.) After mixing 5 mass parts, it diluted with methyl ethyl ketone so that the said solid content might be 10 mass%, and the high refractive index layer liquid (H-3) was prepared. did.

< Production Example  5> For high refractive index layer Of seven liquid (H-4)  pharmacy

67 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 33 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., magnetic light UV7600B) having 6 acryloyl groups in 1 molecule, and a photopolymerization initiator (Brand name: IRGACURE 184, product made by Chiba Specialty Chemicals Co., Ltd.) After mixing 5 mass parts, it diluted with methyl ethyl ketone so that the said solid content might be 10 mass%, and the high refractive index layer lacquer liquid (H-4) was prepared. did.

< Production Example  6> For high refractive index layer Of seven liquid (H-5)  pharmacy

58 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 42 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., ultraviolet light UV7600B) having 6 acryloyl groups in 1 molecule, and a photopolymerization initiator (Brand name: IRGACURE 184, Chiba Specialty Chemicals Co., Ltd.) 5 mass parts was mixed, it diluted with methyl ethyl ketone so that the said solid content might be 10 mass%, and the high refractive index layer liquid (H-5) was prepared. .

< Preparation Example 7> High refractive index layer Chilaek Preparation of (H-6)

94 parts by mass of zirconium oxide fine particles having an average particle diameter of 0.02 μm, 6 parts by mass of a urethane acrylate (molecular weight 1400, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., ultraviolet light UV7600B) and a photopolymerization initiator having six acryloyl groups in one molecule. (Brand name: IRGACURE 184, product made in Chiba Specialty Chemicals Co., Ltd.) After mixing 5 mass parts, it dilutes so that the said solid content may be 10 mass% with methyl ethyl ketone, and prepares the liquid solution for high refractive index layers (H-6). did.

< Production Example  8> For low refractive index layer Of lacquer (L-1)  pharmacy

10 mass parts of dipentaerythritol hexaacrylate, silica fine particle dispersion (brand name: XBAST, Nissan Chemical Co., Ltd.) 90 mass parts, isopropyl alcohol 900 mass parts, a photoinitiator (brand name: IRGACURE 907, Chiba Specialty Chemicals) Co., Ltd.) 5 mass parts was mixed, and the coating liquid (L-1) for low refractive index layers was prepared.

< Production Example  9> denaturation Hollow Silica  Preparation of fine particles (sol)

Hollow silica sol (made by Shokubai Chemical Co., Ltd., brand name: ELECOM NY-1001S1V, 25 mass% dispersion of a hollow silica sol by isopropyl alcohol, average particle diameter 60 nm) 2000 mass parts, (gamma) -acryloyl 70 mass parts of oxypropyl trimethoxysilane ((gamma) -acryloyloxypropyl trimethoxy sillane, Shin-Etsu Chemical Co., Ltd. make, brand name: KBM5103), and 80 mass parts of distilled water are mixed, and a modified hollow silica fine particle (sol) (average particle diameter: 60 nm) Prepared.

< Production Example  10> For low refractive index layer Of lacquer (L-2)  pharmacy

104 parts by mass of perfluoro- (1,1,9,9-tetrahydro-5,8-bisfluoromethyl-4, dioxa-1-nonene) -9-ol and bis (2,2,3, Hydroxyl group by polymerization with 11 parts by mass of a perfluorohexane solution containing 8% by mass of 3,4,4,5,5,6,6,7,7-dodecafluoroheptanoyl) peroxide A containing fluorine aryl ether polymer (number average molecular weight 72,000, mass average molecular weight 118, 000) was obtained.

Next, a fluorine-containing reactive polymer solution having a polymerizable double bond in a hydroxyl group-containing fluorine aryl ether polymer, 43 parts by mass of methyl ethyl ketone, 1 part by mass of pyridine and 1 part by mass of fluoride α-fluoroacrylic acid (13 parts by mass of solids) %, the introduction rate of the hydroxyl group to the (alpha)-fluoro acryloyl group (40 mol%) was prepared. 40 parts by mass of this fluorine-containing reaction polymer solution, 60 parts by mass of the modified hollow silica fine particles, 2 parts by mass of a photopolymerization initiator (manufactured by Chivas Specialty Chemicals, Irgacua 907), isopropyl alcohol 2000 The mass part was mixed and the low liquid refractive index layer liquid (L-2) was prepared.

< Production Example  11> For low refractive index layer Of seven liquid (L-3)  pharmacy

60 parts by mass of the modified hollow silica fine particles, 40 parts by mass of dipentaerythritol hexaacrylate, 2 parts by mass of a photopolymerization initiator (manufactured by Chiba Specialty Chemicals, Irgacua 907), isopropyl alcohol 2000 For low refractive index layer by mixing mass parts A lacquer (L-3) was prepared.

< Production Example  12> For low refractive index layer Of lacquer (L-4)  pharmacy

95 mass parts of polyfunctional binder (brand name: HIC-GL, Kyoeisha Chemical Co., Ltd.) 5 mass parts of silica fine particle dispersions (brand name: XBA-ST, Nissan Chemical Co., Ltd. product), and acryloyl group , 2 parts by mass of a photopolymerization initiator (manufactured by Chivas Specialty Chemicals Co., Ltd., Irgacua 907) and 2000 parts by mass of isopropyl alcohol were prepared to prepare a low-refractive-index layer liquid (L-4).

< Production Example  13> hard Coat layer Of seven liquid (HC-A1)  pharmacy

95 mass parts of dipentaerythritol hexaacrylate, 5 mass parts of acrylic resin microparticles (refractive index 1.495) of an average particle diameter of 0.5 micrometer, 100 mass parts of methyl ethyl ketone, a photoinitiator (brand name: IRGACURE184, Chiba Japan Co., Ltd. product) 4 mass The parts were mixed to prepare a coating solution for hard coat layer (HC-A1).

< Production Example  14> hard Coat layer Of seven liquid (HC-A2)  pharmacy

97 mass parts of dipentaerythritol hexaacrylate, 3 mass parts of acrylic resin microparticles (refractive index 1.495) of an average particle diameter of 1.5 micrometers, 100 mass parts of methyl ethyl ketone, a photoinitiator (brand name: IRGACURE184, Chiba Japan Co., Ltd. product) 4 mass The parts were mixed to prepare a coating solution for hard coat layer (HC-A2).

< Example  1-1>

The coating liquid (HC-1) for the hard coat layer of Preparation Example 1 was applied on a roll coater on a PET film having a thickness of 125 μm such that the film thickness after dry curing was 4 μm, and 400 mJ on a 120 W high pressure mercury lamp. The hard coat process PET film was produced by irradiating and hardening the ultraviolet-ray.

On the said hard-coat treated PET film, using coating liquid H-1 for high refractive index layers, it apply | coated so that the film thickness after drying in a roll coater might be 60 nm, and it irradiated and hardened | cured by ultraviolet-ray 400mJ with 120W high pressure mercury lamp, The refractive index layer was formed. A low refractive index layer is formed on the high refractive index layer by using a coating solution L-1 for low refractive index layer so as to have a film thickness of 20 nm after drying in a roll coater, and curing by irradiating 400 mJ ultraviolet rays with a 120 W high-pressure mercury lamp to cure it. , Tonal correction film was produced.

Apply the hard coat layer coating liquid (HC-1) of Production Example 1 on the back of the color tone correction film so that the film thickness after dry curing is 4 μm, and irradiate 400 mJ ultraviolet rays with a 120 W high-pressure mercury lamp to cure it. The color tone correction film in which the hard-coat layer was laminated | stacked on both surfaces was produced.

After preliminarily drying the color tone correction film in which the hard coat layer was laminated on both surfaces at 100 ° C. for 1 hour, sputtering was performed using an ITO target of indium: tin = 10: 1 (mass ratio) to give a low refractive index layer. On the surface, an ITO layer was formed as a transparent conductive layer having a thickness of 30 nm, and annealing was applied at 150 ° C. for 30 minutes to produce a transparent conductive film. About the said transparent conductive film produced, the transparent color tone (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 1.

< Example  1-2>

The transparent conductive film was produced in the same manner as in Example 1-1 except that the coating liquid H-2 for high refractive index layer was used. About the transparent conductive film produced above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 1.

< Example  1-3>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 65 nm, the film thickness after dry hardening of a low refractive index layer to 25 nm, and making the film thickness of an ITO layer into 25 nm. A transparent conductive film was produced. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 1.

< Example  1-4>

A transparent conductive film was produced in the same manner as in Example 1-1 except that the film thickness after dry curing of the low refractive index layer was 15 nm. About the transparent conductive film produced above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 1.

< Example  1-5>

A transparent conductive film was produced in the same manner as in Example 1-1 except that the film thickness after dry curing of the low refractive index layer was 45 nm and the film thickness of the ITO layer was 25 nm. About the transparent conductive film produced above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 1.

< Example  1-6>

The film thickness after dry hardening of a high refractive index layer is 65 nm, the film thickness after dry hardening of a low refractive index layer is made 30 nm, and the film thickness of an ITO layer is made 25 nm using the low refractive index layer lacquer L-2. Was carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 1.

< Example  1-7>

The film thickness after dry hardening of a high refractive index layer is 65 nm, the film thickness after dry hardening of a low refractive index layer is made 30 nm, and the film thickness of an ITO layer is made 25 nm using the low refractive index layer lacquer L-3. Was carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-8>

The film thickness after dry hardening of a high refractive index layer is set to 45 nm, the film thickness after dry hardening of a low refractive index layer is made into 30 nm, and the film thickness of an ITO layer is made into 25 nm using the low refractive index layer lacquer L-3. Was carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-9>

The film thickness after dry hardening of a high refractive index layer is 90 nm, the film thickness after dry hardening of a low refractive index layer is 25 nm, and the film thickness of an ITO layer is made 20 nm using the low refractive index layer lacquer L-3. Was carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-10>

The film thickness after dry hardening of the high refractive index layer is 65 nm using the high refractive index layer lacquer H-3, and the film thickness after dry hardening of the low refractive index layer is 30 nm using the low refractive index layer lacquer L-3, A transparent conductive film was produced in the same manner as in Example 1-1 except that the thickness of the ITO layer was 25 nm. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-11>

The film thickness after dry hardening of the high refractive index layer is 65 nm using the high refractive index layer lacquer H-4, and the film thickness after dry hardening of the low refractive index layer is 30 nm using the low refractive index layer lacquer L-3, A transparent conductive film was produced in the same manner as in Example 1-1 except that the thickness of the ITO layer was 20 nm. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-12>

The film thickness after dry hardening of a high refractive index layer is 65 nm, the film thickness after dry hardening of a low refractive index layer is 30 nm, and the annealing process after the sputtering of an ITO layer is 150 degreeC. The transparent conductive film was produced like Example 1-1 except having performed for 60 minutes. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-13>

The film thickness after dry hardening of a high refractive index layer is 65 nm, the film thickness after dry hardening of a low refractive index layer is 25 nm, the film thickness of an ITO layer is 25 nm, and ITO is 25 nm, A transparent conductive film was produced in the same manner as in Example 1-1 except that the annealing treatment after the layer spattering was performed at 100 ° C. for 60 minutes. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Example  1-14>

The film thickness after dry hardening of a high refractive index layer is made into 55 nm using the high refractive index lacquer H-4, and the film thickness after dry hardening of a low refractive index layer is made into 30 nm, and the film thickness of an ITO layer is made into 20 nm. Was carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result is shown in Table 2.

< Comparative example  1-1>

A transparent conductive film was produced in the same manner as in Example 1-1 except that the coating solution H-5 for high refractive index layer was used. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-2>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 65 nm, and setting the film thickness after dry hardening of a low refractive index layer to 60 nm using the low-refractive-index layer liquid L-3. To produce a transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-3>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 65 nm, and setting the film thickness after dry hardening of a low refractive index layer to 5 nm using the low-refractive-index layer liquid L-3. To produce a transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-4>

The film thickness after dry hardening of the high refractive index layer is 65 nm using the high refractive index layer lacquer H-6, and the film thickness after dry hardening of the low refractive index layer is 30 nm using the low refractive index layer lacquer L-3, A transparent conductive film was produced in the same manner as in Example 1-1 except that the thickness of the ITO layer was 20 nm. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-5>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 100 nm, and setting the film thickness after dry hardening of a low refractive index layer to 30 nm using the low-refractive-index layer liquid L-3. To produce a transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-6>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 20 nm, and setting the film thickness after dry hardening of a low refractive index layer to 30 nm using the low-refractive-index layer liquid L-3. To produce a transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-7>

The film thickness after dry hardening of a high refractive index layer shall be 20 nm, the film thickness after dry hardening of a low refractive index layer shall be 25 nm, and the film thickness of ITO shall be 70 nm, except , It carried out similarly to Example 1-1, and produced the transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

< Comparative example  1-8>

It carried out similarly to Example 1-1 except having set the film thickness after dry hardening of a high refractive index layer to 70 nm, and setting the film thickness after dry hardening of a low refractive index layer to 30 nm using the low-refractive-index layer liquid L-4. To produce a transparent conductive film. About the transparent conductive film produced above, the transmission color hue (b *), the total light transmittance (%), and the haze value (%) were measured by the said method, and the result was shown in Table 3.

Example 1-1 Example 1-2 Example 1-3 Example 1-4 Example 1-5 Example 1-6
Hard coat layer
Seven liquid name HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 Refractive index 1.53 1.53 1.53 1.53 1.53 1.53 Film thickness (μm) 4 4 4 4 4 4
High refractive index layer
Seven liquid name H-1 H-2 H-1 H-1 H-1 H-1 Refractive index 1.76 1.70 1.76 1.76 1.76 1.76 Film thickness (nm) 60 60 65 65 60 65
Low refractive index layer
Seven liquid name L-1 L-1 L-1 L-1 L-1 L-2 Refractive index 1.53 1.53 1.53 1.53 1.53 1.33 Film thickness (nm) 20 20 25 15 45 30
ITO layer Refractive index 2.00 2.00 2.00 2.00 2.00 2.00 Film thickness (nm) 30 30 25 30 25 25 Transmission color b * 0.0 0.3 0.1 -0.2 0.4 0.4 Total light transmittance (%) 90.3 89.1 89.4 88.2 91.2 91.3 Haze value (%) 0.3 0.3 0.3 0.3 0.4 0.3

Example
1-7 Example
1-8 Example
1-9 Example
1-10 Example
1-11 Example
1-12 Example
1-13 Example
1-14
Hard coat layer
Seven liquid name HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 Refractive index 1.53 1.53 1.53 1.53 1.53 1.53 1.53 1.53 Behind the scenes
(μm) 4 4 4 4 4 4 4 4
High refractive index layer
Seven liquid name H-1 H-1 H-1 H-3 H-4 H-1 H-1 H-4 Refractive index 1.76 1.76 1.76 1.86 1.66 1.76 1.76 1.66 Behind the scenes
(nm) 65 45 90 65 65 65 65 55
Low refractive index layer
Seven liquid name L-3 L-3 L-3 L-3 L-3 L-3 L-3 L-1 Refractive index 1.43 1.43 1.43 1.43 1.43 1.43 1.43 1.53 Behind the scenes
(nm) 30 30 25 30 30 30 25 30 ITO layer
Refractive index 2.00 2.00 2.00 2.00 2.00 1.90 2.30 2.00 Behind the scenes
(nm) 25 25 20 25 20 30 25 20 Transmission color b * 0.3 0.0 0.3 -0.6 0.4 -0.5 0.4 0.5 Total light transmittance (%) 90.4 88.8 91.4 91.0 90.2 90.9 87.5 88.5 Haze value (%) 0.4 0.3 0.4 0.3 0.4 0.3 0.3 0.3

Comparative example
1-1 Comparative example
1-2 Comparative example
1-3 Comparative example
1-4 Comparative example
1-5 Comparative example
1-6 Comparative example
1-7 Comparative example
1-8
Hard coat layer
Seven liquid name HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 HC-1 Refractive index 1.53 1.53 1.53 1.53 1.53 1.53 1.53 1.53 Behind the scenes
(μm) 4 4 4 4 4 4 4 4
High refractive index layer
Seven liquid name H-5 H-1 H-1 H-6 H-1 H-1 H-1 H-1 Refractive index 1.6 1.76 1.76 1.96 1.76 1.76 1.76 1.76 Behind the scenes
(nm) 60 65 65 65 100 20 20 70
Low refractive index layer
Seven liquid name L-1 L-3 L-3 L-3 L-3 L-3 L-3 L-4 Refractive index 1.53 1.43 1.43 1.43 1.43 1.43 1.43 1.58 Behind the scenes
(nm) 20 60 5 30 30 30 25 30 ITO layer
Refractive index 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.00 Behind the scenes
(nm) 30 30 30 20 30 30 70 30 Transmission color b * 2.4 9.3 -2.0 -2.9 5.9 2.3 9.3 2.7 Total light transmittance (%) 86.3 90.2 84.5 89.7 91.1 86.6 79.8 88.7 Haze value (%) 0.4 0.3 0.3 2.1 0.3 0.3 0.5 0.3

In the results shown in Tables 1 and 2, in Examples 1-1 to 1-14, the high refractive index layer was formed of zirconium oxide fine particles and urethane acrylate, and the refractive index and film thickness of the high refractive index layer and the low refractive index layer, and also ITO The refractive index and the film thickness of the layer are set in the range defined by the present invention. Therefore, while coloring of transmitted light could be fully suppressed, total light transmittance was raised and the haze value could be suppressed.

On the other hand, as shown in Table 3, in the comparative example 1-1, since the refractive index of the high refractive index layer is smaller than the range prescribed | regulated by this invention, the value of the transmission color b * becomes large, and the transmitted light shows coloring and the whole light ray further The result which the transmittance | permeability falls was called. In the comparative example 1-2, since the film thickness of the low refractive index layer was larger than the range prescribed | regulated by this invention, the value of the transmissive color b * became excessive, and the transmissive color resulted in coloring. In Comparative Example 1-3, since the film thickness of the low refractive index layer was smaller than the range prescribed by the present invention, the absolute value of the transmission color b * was increased, and the transmitted light showed coloration, which further reduced the total light transmittance.

In the comparative example 1-4, since the refractive index of the high refractive index layer was larger than the range prescribed | regulated by this invention, the absolute value of the transmission color b * became large, and the transmitted light showed the result which shows coloring. In Comparative Example 1-5, since the film thickness of the high refractive index layer was larger than the range prescribed | regulated by this invention, the value of the transmission color b * became large and the transmission color came to the result which shows coloring. In Comparative Example 1-6, since the film thickness of the high refractive index layer was smaller than the range prescribed | regulated by this invention, the value of the transmission color b * became large, and the transmitted light showed coloring and the result which the total light transmittance fell further was shown. In Comparative Example 1-7, since the film thickness of the ITO layer was outside the range prescribed | regulated by this invention, the value of the transmission color b * became excessive, the transmitted light showed coloring, and the result that the total light transmittance fell was called. . In the comparative example 1-8, since the refractive index of the low refractive index layer was larger than the range prescribed | regulated by this invention, the value of the transmission color b * became excessive and the result that the transmitted light showed coloring.

< Example  2-1>

The coating liquid (HC-1) for the hard coat layer of Production Example 1 was applied on a PET film having a thickness of 125 μm in a roll coater so as to have a thickness of 2 μm after dry curing, and irradiated with 400 mJ ultraviolet rays using a 120 W high pressure mercury lamp. By hardening, the hard-coat process PET film was produced.

Apply the hard coat layer coating liquid (HC-A1) of Production Example 13 to the backside of this hard coat treated PET film in a roll coater so as to have a thickness of 2 μm after dry curing, and irradiate 400 mJ ultraviolet rays with a 120 W high pressure mercury lamp, By hardening, the active hard coat layer was formed in the back surface. In this way, the double-sided hard coat film was produced. Although the curlability of the double-sided hard coat film obtained above was evaluated, it was "(◎)". On the hard-coat layer (HC-1) of one side of the said double-sided hard-coat film, the high refractive index layer, the hand refractive index layer, and the ITO layer were formed like Example 1-1, and the transparent conductive film was obtained. About the transparent conductive film obtained above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 4.

< Example  2-2>

The coating liquid (HC-1) for the hard coat layer of the manufacturing example 1 was apply | coated so that the film thickness after dry hardening might be set to 4 micrometers on the PET film of thickness 125micrometer in a roll coater, and it irradiated 400mJ ultraviolet-ray with a 120W high pressure mercury lamp, By hardening, the hard-coat process PET film was produced. The hard coat layer coating liquid (HC-A2) of Production Example 14 was applied to the back side of the hard coat treated PET film in a roll coater such that the film thickness after dry curing was 4 μm, and 400 mJ ultraviolet rays were irradiated with a 120 W high pressure mercury lamp. By hardening, the active hard coat layer was formed in the back surface. In this way, the double-sided hard coat film was produced.

The curling evaluation of the double-sided hard coat film obtained above was "(circle)". On the hard-coat layer (HC-1) of one side of this double-sided hard-coat film, it carried out like Example 1-1, the high refractive index layer, the low refractive index layer, and the ITO layer were formed, and the transparent conductive film was obtained. About the transparent conductive film obtained above, transmission color hue (b *), total light transmittance (%), and haze value (%) were measured by the said method, and the result is shown in Table 4.

< Comparative example  2-1>

The coating liquid (HC-1) for the hard coat layer of Production Example 1 was applied on a PET film having a thickness of 125 μm in a roll coater such that the film thickness after dry curing was 4 μm, and 400 mJ ultraviolet rays were irradiated with a 120 W high pressure mercury lamp. By hardening, the hard-coat process PET film was produced. On the back side of this hard coat treated PET film, the coating liquid (HC-1) for hard coat layer of Production Example 1 was applied in a roll coater so as to have a film thickness of 4 μm after dry curing, and irradiated with 400 mJ ultraviolet rays with a 120 W high pressure mercury lamp. And hardening, the double-sided hard coat film was produced. The curlability of the double-sided hard coat film obtained above was evaluated, but was "x".

Example 2-1 Example 2-2 Comparative Example 2-1
Hard coat layer Seven liquid name HC-1 HC-1 HC-1 Refractive index 1.53 1.53 1.53 Film thickness (μm) 2 4 4
High refractive index layer
Seven liquid name H-1 H-1 - Refractive index 1.76 1.76 - Film thickness (nm) 60 60 -
Low refractive index layer
Seven liquid name L-1 L-1 - Refractive index 1.53 1.53 - Film thickness (nm) 20 20 - ITO layer
Refractive index 2.00 2.00 - Film thickness (nm) 30 30 -

Functional layer

Seven liquid HC-A1 HC-A2 HC-1 Average Particle Diameter of Fine Particles (μm) 0.5 1.5 1.53 Amount of Fine Particles
(Mass part) 5 3 4 Film thickness (nm) 2 4 - % Of average particle diameter to film thickness
25
38
- Curling of double-sided hard coat ◎ ◎ × Transmission color b * 0.0 0.3 - Total light transmittance (%) 90.3 89.1 - Haze value (%) 0.3 0.3 -

In the result shown in Table 4, in Example 2-1 and 2-2, the amount of translucent microparticles | fine-particles was contained in the hard-coat layer, and the curlability of the double-sided hard coat improved. In addition, even when the active hard coat layer was used, the value of the transmission color b * and the total light transmittance did not change. On the other hand, in Comparative Example 2-1, since the light-transmitting microparticles | fine-particles are not contained in a suitable amount in a hard-coat layer, the curling property of a double-sided hard-coat film is bad, irregularities generate | occur | produce in the wrinkles and film which arise, and a high refractive index layer and The low refractive index layer could not be laminated.

Claims (6)

It is a transparent conductive film provided with the high refractive index layer, the low refractive index layer, and the tin dope indium oxide layer laminated | stacked in order from the 1st main surface of a polyester film,
The high refractive index layer is formed of metal oxide fine particles and an ultraviolet curable binder, the refractive index of the high refractive index layer at a wavelength of 400 nm is 1.63 ~ 1.86, the film thickness of the high refractive index layer is 40 ~ 90 nm,
The refractive index of the low refractive index layer at a wavelength of 400 nm 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 said tin dope indium oxide layer in wavelength 400nm is 1.85-2.35, and the film thickness of the said tin dope indium oxide layer is 5-50 nm, The transparent conductive film characterized by the above-mentioned.
The transparent conductive film according to claim 1, further comprising a hard coat layer having a thickness of 1.0 to 10.0 μm between the polyester film and the high refractive index layer.
The transparent conductive film according to claim 1 or 2, further comprising a functional layer on the second main surface of the polyester film.
The transparent conductive film according to claim 3, wherein the functional layer is a hard coat layer, an antiglare layer, a fingerprint familiarity layer, or a self-repair layer.
The said functional layer is an active hard coat layer, The film thickness of the said active hard coat layer is 1.0-10.0 micrometers, The said active hard coat layer is 0.5-30 mass% in the said active hard coat layer. The transparent conductive film containing translucent microparticles | fine-particles and the ratio of the average particle diameter of the said translucent microparticles | fine-particles to the film thickness of the said active hard coat layer is 10 to 60%.
The transparent conductive film according to claim 4, wherein the functional layer is a hard coat layer or an antiglare layer, further comprising an antireflection layer laminated on the functional layer.

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