JP2008151866A - Optical film, polarizing plate, image display device and method for manufacturing the optical film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical film which has an excellent dustproof property, in which uneven interference is restrained from being caused and which has high hardness and is excellent in scratch resistance and other performances and to provide a polarizing plate and a display device in each of which the optical film is used. <P>SOLUTION: The optical film has an antistatic layer containing an electrically conductive particle and at least one adjacent layer adjacent to the antistatic layer on a support. A layered zone having the refractive index intermediate between that of the antistatic layer and that of the adjacent layer is formed between the antistatic layer and the adjacent layer. The layered zone contains a binder having an aromatic group or an inorganic fine particle which is different from the electrically conductive particle and has ≥1.55 refractive index. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical film, a polarizing plate, an image display device, and a method for producing an optical film.

  In recent years, display devices have been used at home and demanded toughness for handling of general users. For example, in various image display devices such as liquid crystal display (LCD), plasma display panel (PDP), electroluminescence display (ELD), cathode ray tube display (CRT), SED (Surface-Conduction Electron-emitter Display) The optical film used on the surface is required to have high physical strength (such as scratch resistance), transparency, chemical resistance, and weather resistance (such as moist heat resistance and light resistance). Further, in order to prevent a decrease in contrast due to reflection of external light or reflection of an image, antiglare performance and antireflection performance are required. In addition, antifouling properties and dustproof properties are required that are less likely to get dirt and dust on the surface during daily handling.

  Dustproofness is important from both the viewpoint of use in the final form of the image display apparatus and the viewpoint of manufacturing the image display apparatus, and the importance is increasing. One of the methods adopted as a method for imparting dust resistance is a method of forming a so-called antistatic layer for reducing surface resistance by introducing conductive fine particles into an optical film (Patent Document 1). However, in general, conductive fine particles have a high refractive index of about 1.6 to 2.2, and the antistatic layer is a layer having a high refractive index. If the refractive index of the antistatic layer and the adjacent layer in the optical thin film is different, optical interference occurs, and there is a problem that fluctuations in the thickness of the antistatic layer and minute defects are observed as unevenness in the optical film, Improvements were sought.

In order to solve the above-mentioned problems, attempts have been made to reduce interference unevenness by mixing the interface between the antistatic layer and the adjacent layer. For example, Patent Document 2 discloses an optical film in which an antistatic layer and a layer having no antistatic function are applied in an uncured state. However, even in such an optical film, since the particles of the antistatic layer are diffused and the interface is mixed, the particle density decreases, the contact probability between the particles decreases, the conductivity decreases, and sufficient dust resistance is obtained. It may not be possible. In particular, when the amount of the binder is increased to increase the strength of the coating film, or when the antistatic layer is thin, the conductive loss may be large.
In short, the conventionally proposed optical films have not been able to sufficiently improve the dust resistance while maintaining the performance normally required for optical films.
JP-A-11-326602 JP 2005-148444 A

  An object of the present invention is to provide an optical film that is excellent in dust resistance, suppresses occurrence of interference unevenness, and is excellent in other performances. Another object is to provide an optical film having high hardness and excellent scratch resistance. Furthermore, it is providing the polarizing plate and display apparatus using such an optical film.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have formed a layer region different from both layers at the interface between the antistatic layer and the adjacent layer using a specific binder-forming compound. The present inventors have found that an optical film formed as described above can achieve the above object, and have completed the present invention.
That is, this invention consists of the following each structure.

1. On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the intermediate refractive index of both layers is between the two layers. An optical film in which a layer region having a refractive index is present and the layer region contains a binder having an aromatic group (hereinafter, this invention is referred to as “first invention”).
2. On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the intermediate refractive index of both layers is between the two layers. An optical film in which a layer region having a refractive index exists and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from conductive particles (hereinafter, this invention is referred to as “second invention”).
3. On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the constituent components of the antistatic layer between the two layers, An optical film in which a layer region formed by mixing the constituent components of the adjacent layer is present and the layer region contains a binder having an aromatic group (hereinafter, this invention is referred to as “third invention”).
4). On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the constituent components of the antistatic layer between the two layers, There is a layer region formed by mixing the constituent components of the adjacent layer, and the layer region is an optical film containing inorganic fine particles having a refractive index of 1.55 or more different from the conductive particles (hereinafter referred to as this film). The invention is referred to as “fourth invention”).
5. The layer region is formed by gradually changing the composition of the polymerizable compound and / or inorganic fine particles forming both layers at the interface between the antistatic layer and the adjacent layer. The optical film described in 1.
6). The optical film according to any one of 1 to 4, wherein the layer region is formed by forming another interface mixed layer at the interface between the antistatic layer and the adjacent layer.
7). The layer region is formed by the antistatic layer and the adjacent layer being formed such that the components of both layers form a sea-island structure or a co-continuous phase at the interface between them. Optical film.
8). The optical film according to any one of claims 1, 3, and 5 to 7, wherein the binder having an aromatic group is formed of a sulfur-containing aromatic compound having at least one polymerizable functional group.
9. The optical film according to any one of 1 to 8, wherein the optical film further has a low refractive index layer.
10. A polarizing plate having a polarizing film and protective films provided on both sides of the polarizing film, wherein at least one of the protective films is the optical film according to any one of 1 to 9.
11. The image display apparatus which has an optical film of 1-9, or a polarizing plate of 10.
12 A method for producing an optical film having an antistatic layer and at least one adjacent layer adjacent thereto on a support, wherein the antistatic layer contains a binder having an aromatic group, and the antistatic layer And an adjacent layer, a method for producing an optical film is cured so that the reaction rate of the polymerizable functional group of the previously applied layer is 0% or more and 50% or less.
13. A method for producing an optical film having an antistatic layer and at least one adjacent layer adjacent thereto on a support, wherein the antistatic layer has a refractive index of 1.55 different from that of conductive particles. An optical film that contains larger inorganic fine particles and is cured so that the reaction rate of the polymerizable functional group of the previously applied layer is 0% or more and 50% or less when forming the antistatic layer and the adjacent layer. Manufacturing method.

ADVANTAGE OF THE INVENTION According to this invention, it can provide the optical film which was excellent in dustproof property and reduced the interference nonuniformity. In addition, an optical film having excellent dustproofness, reduced interference unevenness, high hardness, excellent scratch resistance, and low reflection is provided.

  Hereinafter, the present invention will be described in detail. In the present specification, when a numerical value represents a physical property value, a characteristic value, etc., the description “(numerical value 1) to (numerical value 2)” means “(numerical value 1) or more and (numerical value 2) or less”. . In the present specification, the description “(meth) acrylate” means “at least one of acrylate and methacrylate”. The same applies to “(meth) acrylic acid” and the like.

[Inventions 1-4]
The optical film of the first invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region having a refractive index intermediate between the refractive indexes of both layers, and the layer region contains a binder having an aromatic group.
The optical film of the second invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region having a refractive index intermediate between the refractive indexes of both layers, and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from the conductive particles.
The optical film of the third invention has, on a support, an antistatic layer containing conductive particles, and at least one adjacent layer adjacent to the antistatic layer, between the layers. There is a layer region formed by mixing the constituent component of the antistatic layer and the constituent component of the adjacent layer, and the layer region contains a binder having an aromatic group.
The optical film of the fourth invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region formed by mixing the component of the antistatic layer and the component of the adjacent layer, and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from the conductive particles. contains.

[First invention]
First, the optical film of the first invention will be described.
The optical film of the first invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region having a refractive index intermediate between the refractive indexes of both layers, and the layer region contains a binder having an aromatic group.
In a preferred embodiment, the layer region is formed by mixing the component of the antistatic layer and the component of the adjacent layer, and the region has a refractive index of 1.55 different from the conductive particles. This is an embodiment containing the above inorganic fine particles. That is, the most preferred embodiment in the present invention is an embodiment that satisfies all of the first to fourth inventions. In the following explanation of the first invention, explanation will be made based on this most preferred embodiment.

1. (Layer structure of optical film)
The optical film of the present invention has at least one antistatic layer containing conductive particles (hereinafter referred to as “AS layer”) and an adjacent layer adjacent thereto (hereinafter referred to as “N layer”) on a support. It has a layer, a layer region having an intermediate refractive index between both layers, and a binder having an aromatic group in the layer region. In addition, inorganic fine particles having a refractive index larger than 1.55, which is different from the conductive particles, are preferably contained.
In the present invention, the layer region formed between the AS layer and the N layer is formed by applying the forming composition for forming both the AS layer and the N layer at the same time. It is preferable to manufacture by diffusing each other component in the adjacent layer using a method of applying the forming coating composition and coating the other layer forming coating composition with a low polymerization rate. Details will be described in detail in the column of the manufacturing method described later.
In the optical film of the present invention, the positional relationship among the AS layer, the N layer, and the support is particularly limited as long as the object of the present invention is to achieve antistatic properties, reduction of unevenness, and improvement of adhesion. There is no. From the viewpoint of improving the antistatic performance, the layers are preferably formed in the order of the support, the N layer, and the AS layer.

The optical film of the present invention can prevent dust (such as dust) from adhering to the surface of the optical film by constructing an antistatic layer, that is, can exhibit excellent dust resistance. The dust resistance is expressed by lowering the surface resistance value of the optical film surface, and the higher the conductivity of the antistatic layer, the higher the effect.
In the optical film of the present invention, the surface resistance value on the AS layer side surface is preferably 1 × 10 ¹³ Ω / □ or less, more preferably 1 × 10 ¹² Ω / □ or less, and particularly preferably. Is 1 × 10 ¹¹ Ω / □ or less and 1 × 10 ⁷ Ω / □ or more. The surface resistance of the optical film can be measured by a circular electrode method at 25 ° C. and 60%.

In the present invention, the intermediate refractive index region is defined as the refractive index when only the AS layer forming coating composition is applied and cured, and N (as), and the N layer forming coating composition is applied. When the refractive index in this case is N (n), this is a region having a refractive index between N (n) and N (as).
That is, the “intermediate refractive index” means not only the average value of N (n) and N (as) but also the refractive index in the range of ± 0 to 0.45 × ΔN of the average value. . Here, ΔN = | N (as) −N (n) |.
The refractive index can be calculated by measuring the reflectance and calculating the refractive index and the film thickness by simulation of optical thin film interference. However, as described in the following embodiments, since the layer having a constant refractive index may not be formed with a constant film thickness, in the present invention, the composition of the constituent components in the coating film constituting each layer is analyzed, The refractive index of the coating film obtained by preparing a coating liquid having the analytical composition and applying and curing the coating liquid can be used as the refractive index of the coating film of each layer. Analysis of the components in the coating film is possible by preparing an ultrathin oblique section and using TOFSIMS (Time of flight secondary mass spectrometry; for example, TOF-SIMS IV (product name) manufactured by ION TOF). is there.

  Further, in the present invention, the diffusion of the conductive particles in the AS layer forming coating composition to the N layer forming coating composition adjacent to the AS layer forming coating reduces the contact between the conductive particles in the film. Less is preferred because it tends to lower the conductivity of the layer. In order to form a region having an intermediate refractive index between the AS layer and the N layer, a refractive index 1 different from that of the binder and / or conductive particles having an aromatic group that is more easily diffused than the conductive particles. It is preferable to use .55 or more inorganic fine particles. The materials that can be used for each layer will be described later in the column of constituent components of the optical film.

  Below, the preferable aspect of the optical film of this invention which has a layer area | region which contains AS layer and N layer and becomes a refractive index intermediate | middle of both between both layers is demonstrated.

As a preferred first embodiment, as shown in FIG. 1, there is an embodiment in which the layer region is a region where the composition of both the AS layer and the N layer is gradually changed. FIG. 1 is a schematic diagram showing an antistatic layer and an adjacent layer, which are the main parts of an optical film 1 as one embodiment of the present invention. Specifically, as shown in FIG. 1, the AS layer 2 and the N layer 4 are provided on a support (not shown) with the layer region 3 interposed therebetween. The layer region 3 is not formed by coating a coating composition having a composition different from that of the AS layer or the like. For example, the coating composition for forming the N layer is formed on the coating composition for forming the AS layer. The layer region formed in such a manner that the coating composition for the AS layer and the coating composition for the N layer penetrate each other and are mixed to produce a concentration distribution of the two by coating the product. it can. Here, the composition refers to the constituent ratio of the polymerizable compound and / or fine particles in the cured film.
In this embodiment, the thickness of the layer region is preferably 0.03 μm to 3 μm, more preferably 0.05 μm to 1.5 μm. When the refractive index of the AS layer component alone is different from the refractive index of the N layer component alone by 0.05 or more, the thickness of the layer region is particularly preferably 0.05 μm to 1 μm. In this embodiment, the layer region is a layer in which the composition gradually changes from the composition of the bulk AS layer to the composition of the bulk adjacent layer (N layer) between the upper end and the lower end.

In a preferred second embodiment, the layer region is formed by forming another interfacial mixed layer at the interface between the AS layer and the N layer.
Specifically, the configuration of the AS layer, the N layer, and the layer region is the same as that shown in FIG. 1, but the layer region penetrates the coating composition for forming the AS layer and the coating composition for forming the N layer. Rather than being mixed, the components derived from both coating compositions are uniformly mixed and formed.
In the second aspect, the thickness of the interfacial mixed layer which is a layer region is preferably 0.05 μm to 1 μm, more preferably 0.05 μm to 0.5 μm.

As a preferred third aspect, the components of the AS layer and the N layer form a sea-island structure or a co-continuous phase at the interface to constitute a layer region. The phase forming the sea-island structure or the co-continuous phase may have the same composition as the AS layer or the N layer, but may be a phase having a different composition.
2 and 3 are schematic views showing the structure of the layer region in one embodiment of the optical film of the present invention, FIG. 2 shows a sea-island structure, and FIG. 3 shows a co-continuous phase structure.
Specifically, as shown in FIG. 2, the sea island structure layer region 3 of the present embodiment is formed by the sea portion 3b formed by the AS layer forming coating composition and the N layer forming coating composition. And the island portion 3a formed. The island portion may be formed by the coating composition for forming the AS layer, and the sea portion may be formed by the coating composition for forming the N layer. Further, the sea portion and the island portion may be formed by a mixture in which both are mixed at different ratios.

FIG. 3 shows the layer region of the co-continuous phase of this embodiment. The colored portion and the white portion represent different components. For example, a layer region formed by a first phase mainly composed of components derived from the AS layer (for example, a colored portion) and a second phase mainly composed of components derived from the N layer (for example, a white portion) can be mentioned. Also, the first phase (for example, a colored portion) generated by mixing the components derived from the AS layer and the N layer, and the components derived from the AS layer and the N layer, which are different from the first phase, are generated. Examples include a layer region formed by the second phase (for example, a white portion).
In the third aspect, the equivalent sphere diameter of the island structure portion is preferably 0.01 μm to 1 μm, more preferably 0.02 to 0.3 μm, and most preferably 0.02 to 0.15 μm. In addition, the thickness of the layer region is preferably 0.03 to 3.0 μm, and more preferably 0.05 to 1.5 μm.

  Among the above-described embodiments, the first embodiment is particularly preferable from the viewpoints of prevention of unevenness and interlayer adhesion. In the present invention, the thickness of the AS layer is preferably 0.1 to 5.0 μm, more preferably 0.1 to 3.0 μm, and most preferably 0.2 to 3.0 μm. The thickness of the N layer is preferably 1.0 to 30.0 μm, more preferably 2.0 to 20.0 μm, and most preferably 2.0 to 10.0 μm.

[Other layers]
In the present invention, a layer structure in which a known optical functional layer is added in addition to the AS layer and the N layer may be employed. Preferably, a structure in which one or more antireflection layers are stacked in consideration of the refractive index, the film thickness, the number of layers, the layer order, and the like so that the reflectance is reduced by optical interference is preferable.
Although the example of the preferable layer structure of the optical film of this invention is shown below, this invention is not limited to these. In the following configuration, the base film means a support.
-Base film / N layer / AS layer-Base film / N layer / AS layer / low refractive index layer-Base film / N layer / AS layer / low refractive index layer / antifouling layer-Base film / N Layer / AS layer / high refractive index layer / low refractive index layer-base film / N layer / AS layer / low refractive index layer / high refractive index layer / low refractive index layer-base film / AS layer / N layer Base film / AS layer / N layer / low refractive index layer • Base film / hard coat layer / N layer / AS layer • Base film / hard coat layer / N layer / AS layer / low refractive index layer • Base material Film / Hard coat layer / N layer / AS layer / Low refractive index layer / High refractive index layer / Low refractive index layer ・ Base film / Anti-glare layer / N layer / AS layer ・ Base film / Anti-glare layer / N Layer / AS layer / low refractive index layer-base film / light diffusion layer / N layer / AS layer-base film / light diffusion layer / N layer / AS layer / low refractive index layer

  The materials that can be used for each of the above layers and the physical properties of the layers will be described later, but for the antiglare layer and the light diffusion layer, those usually used for this type of optical film can be used without any particular limitation.

2. (Each component layer of optical film)
Hereinafter, each layer will be described.

2-1. (Constituent component of AS layer)
The AS layer is a layer formed by applying a coating composition containing conductive particles and a binder-forming compound having an aromatic group as main components.

2-1-1. (Conductive particles)
Examples of the conductive particles used in the AS layer include carbon-based fine particles, metal-based fine particles, metal oxide-based fine particles, and conductive coating-based fine particles.
Examples of the carbon-based fine particles include carbon powders such as carbon black, ketjen black, and acetylene black, carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, and carbon flakes of pulverized expanded graphite.
Examples of metal-based fine particles include metals such as aluminum, copper, gold, silver, nickel, chromium, iron, molybdenum, titanium, tungsten, and tantalum, and powders of alloys containing these metals, metal flakes, iron, and copper. And metal fibers such as stainless steel, silver-plated copper and brass.
Examples of the metal oxide fine particles include tin oxide, antimony-doped tin oxide (ATO), indium oxide, tin-doped indium oxide (ITO), zinc oxide, aluminum-doped zinc oxide, and antimony oxide. .

Examples of the conductive coated fine particles include various fine particle surfaces such as titanium oxide (spherical, needle-shaped), potassium titanate, aluminum borate, barium sulfate, mica, silica, etc., and conductive particles such as tin oxide, ATO, and ITO. Conductive fine particles coated with: resin beads such as polystyrene, acrylic resin, epoxy resin, polyamide resin, polyurethane resin, melamine resin, and formaldehyde resin surface-treated with metal and metal oxide such as gold and / or nickel are preferable. . These are particles formed by forming a conductive portion of a metal or metal oxide on the outer surface of non-conductive particles, and have a feature that the surface has higher conductivity than the inside of the particles. The materials used for the surface treatment are metals and metal oxides, preferably metals. Of these, gold, silver or nickel, which are highly conductive and stable metals, are preferred, and gold is most preferred.
Examples of conductive particles having a low refractive index include particles obtained by coating porous silica-based fine particles or silica-based fine particles having cavities therein with antimony oxide. A specific preparation method is described in JP-A-2005-119909.

The primary particle mass average particle diameter of the conductive particles is preferably 1 to 200 nm, more preferably 1 to 150 nm, still more preferably 1 to 100 nm, and particularly preferably 1 to 80 nm. The average particle diameter of the conductive particles can be measured by a light scattering method or an electron micrograph. The mass average particle diameter of the secondary particles in a dispersed state is preferably 1 to 200 nm, preferably 5 to 150 nm, more preferably 10 to 100 nm, and particularly preferably 10 to 80 nm. By miniaturizing the conductive particles to 200 nm or less, an antistatic layer that does not impair transparency can be produced.

The specific surface area of the conductive particles is preferably 10 to 400 m ² / g, more preferably from 20 to 200 m ² / g, and most preferably from 30 to 150 m ² / g.

The shape of the conductive particles is preferably a rice grain shape, a spherical shape, a cubic shape, a spindle shape, a scale shape, a needle shape, or an indefinite shape, and particularly preferably an indefinite shape, a needle shape, or a scale shape.
In order to form an antistatic layer by dispersing these conductive particles in a binder, the amount of the conductive particles used is 5 to 95 mass (in the solid content of the AS layer) with respect to the total components of the antistatic layer. %, More preferably 10 to 90% by mass, and most preferably 30 to 90%. The above range is preferable because it is excellent in conductivity and has less adverse effects such as a decrease in film strength and an increase in haze.

(Dispersion of conductive particles)
The conductive particles are preferably dispersed using a disperser. Examples of the disperser include a sand grinder mill (for example, a bead mill with pins), a dyno mill, a high-speed impeller mill, a pebble mill, a roller mill, an attritor and a colloid mill. A media disperser such as a sand grinder mill or a dyno mill is particularly preferable. Further, preliminary dispersion processing may be performed. Examples of the disperser used for the preliminary dispersion treatment include a ball mill, a three-roll mill, a kneader, and an extruder.

2-1-2. (Binder with aromatic group)
As the binder having an aromatic group used in the AS layer, any polymer containing an aromatic group can be used without particular limitation. However, in order to increase the refractive index of the binder, an aromatic group is included in the molecule. In addition to the group, it preferably contains a halogen atom other than fluorine, a sulfur atom and the like. The binder-forming compound preferably has a polymerizable functional group in the molecule, and examples of the polymerizable functional group include functional groups such as an epoxy group, a hydroxyl group, a silanol group, a vinyl group, an acryloyl group, and a methacryloyl group. Can do. Among these, when an acryloyl group or a methacryloyl group is used, an AS layer formed by curing is preferable because of high hardness. That is, when a binder-forming compound having such a polymerizable functional group is used, a low molecular weight compound in the coating composition is converted into a high molecular weight polymer by a polymerization reaction in the final optical film. Is formed, and a high-hardness coating film (AS layer) is formed.

  The molecular weight of the binder-forming compound having an aromatic group is preferably 150 or more and 2500 or less, and more preferably 300 or more and 1500 or less. By setting it as the molecular weight of this area | region, the diffusibility in a coating film can be provided and the volatilization from a coating film can be suppressed.

  In the present invention, the compound having a polymerizable functional group that can be preferably used as a compound that forms a binder having an aromatic group includes a compound having an aromatic group in the molecule and having one or more polymerizable functional groups. If so, there is no particular limitation. A compound having a high refractive index is preferable because it diffuses during coating and film formation and easily forms an intermediate refractive index layer between the AS layer and the N layer and effectively works to prevent unevenness, and a plurality of aromatic groups or sulfur atoms in the molecule, Compounds containing halogen atoms are preferred. Examples of compounds that can be preferably used in the present invention include the following compounds.

(A) Sulfur-containing aromatic compound having two vinyl groups in one molecule (B) Sulfur-containing aromatic compound having two (meth) acryloyl groups in one molecule (C) Two (meta) in one molecule ) Sulfur-containing aromatic compound having acryloyloxy group (D) Sulfur-containing aromatic compound having one (meth) acryloyl group in one molecule

Hereinafter, preferable compounds will be sequentially described.
(A) Sulfur-containing aromatic compound having two vinyl groups in one molecule A preferred embodiment is a compound represented by the following general formula (I).

Formula (I):

In the formula, R ¹ , R ² , R ³ and R ⁴ may be the same or different and each represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms. n represents an integer of 0 to 10.

Examples of the halogen atom represented by R ¹ , R ² , R ³ and R ⁴ in the vinyl sulfide compound represented by the general formula (I) in the present invention include chlorine, bromine, iodine, etc. Examples of the alkyl group of ˜6 include linear and branched alkyl groups such as methyl, ethyl, propyl, i-propyl, butyl, sec-butyl, t-butyl, pentyl, hexyl and the like. Preferably, R ^{1 to} R ⁴ are all hydrogen atoms, and n is 0 to 10, more preferably 0 to 2, particularly 0. Examples of such vinyl sulfide compounds include the following compounds.

  Bis (4-vinylthiophenyl) sulfide, bis (3-methyl-4-vinylthiophenyl) sulfide, bis (3,5-dimethyl-4-vinylthiophenyl) sulfide, bis (2,3,5,6- Tetramethyl-4-vinylthiophenyl) sulfide, bis (3-hexyl-4-vinylthiophenyl) sulfide, bis (3,5-dihexyl-4-vinylthiophenyl) sulfide, bis (3-chloro-4-vinyl) Thiophenyl) sulfide, bis (3,5-dichloro-4-vinylthiophenyl) sulfide, bis (2,3,5,6-tetrachloro-4-vinylthiophenyl) sulfide, bis (3-bromo-4- Vinylthiophenyl) sulfide, bis (3,5-dibromo-4-vinylthiophenyl) sulfide, bis (2,3,5,6) Tetrabromo-4-vinylthiophenyl) sulfide, preferably bis (4-vinylthiophenyl) sulfide, bis (2,3,5,6-tetrachloro-4-vinylthiophenyl) sulfide, bis (2,3, 5,6-tetrabromo-4-vinylthiophenyl) sulfide and the like.

  The method for producing the vinyl sulfide compound is not particularly limited. For example, after reacting bis (4-mercaptophenyl) sulfide with dichloroethane in the presence of an alkali, a method of dehydrochlorinating with an alkali, etc. Can be mentioned. In this case, compounds having different numbers of n in the above general formula (I) can be obtained by changing the reaction conditions such as the amount of dichloroethane used and the charging method.

(B) Sulfur-containing aromatic compound having two (meth) acryloyl groups in one molecule A preferred embodiment is a compound represented by the following general formula (II).

General formula (II):

In the formula, R ⁵ , R ⁶ , R ⁷ and R ⁸ may be the same or different and each represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms.

In the methacrylic acid derivative represented by the above general formula (II), the halogen atom represented by R ⁵ , R ⁶ , R ⁷ and R ⁸ and the alkyl group having 1 to 6 carbon atoms include those represented by the above general formula (I). It may be the same as R ^{1 to} R ⁴ . Preferably, R ^{5 to} R ⁸ are all hydrogen atoms. Examples of such methacrylic acid derivatives include the following compounds.

  Bis (4-methacryloylthiophenyl) sulfide, bis (3-methyl-4-methacryloylthiophenyl) sulfide, bis (3,5-dimethyl-4-methacryloylthiophenyl) sulfide, bis (2,3,5,6- Tetramethyl-4-methacryloylthiophenyl) sulfide, bis (3-hexyl-4-methacryloylthiophenyl) sulfide, bis (3,5-dihexyl-4-methacryloylthiophenyl) sulfide, bis (3-chloro-4-methacryloyl) Thiophenyl) sulfide, bis (3,5-dichloro-4-methacryloylthiophenyl) sulfide, bis (2,3,5,6-tetrachloro-4-methacryloylthiophenyl) sulfide, bis (3-bromo-4- Methacryloylthiophenyl) sulfide, (3,5-dibromo-4-methacryloylthiophenyl) sulfide, bis (2,3,5,6-tetrabromo-4-methacryloylthiophenyl) sulfide, preferably bis (4-methacryloylthiophenyl) sulfide, bis (2,3,5,6-tetrachloro-4-methacryloylthiophenyl) sulfide, bis (2,3,5,6-tetrabromo-4-methacryloylthiophenyl) sulfide and the like.

(C) Sulfur-containing aromatic compound having two (meth) acryloyloxy groups in one molecule As a preferred embodiment, alkylene oxide modified di (meth) of bisthiophenol sulfide represented by the following general formula (III) Examples include acrylate compounds.

General formula (III):

In the formula, R ₁ and R ₂ represent hydrogen or a methyl group, X represents a methyl group, chlorine, bromine or iodine, t represents an integer of 0 to 2, and m and n each represents an integer of 0 to 3.

  In general formula (III), a compound in which m and n are both 0 is easily crystallized, and therefore, a compound in which m and n are integers of 1 to 3 is preferable. When a compound similar to the general formula (III) in which m and n are 4 or more is used, it is not preferable because heat resistance and refractive index are lowered.

  Specific examples of the compound represented by the general formula (III) include bis (4-methacryloxyphenyl) sulfide, bis (4-acryloxyphenyl) sulfide, bis (4-methacryloxyethoxyphenyl) sulfide, bis (4- Acryloxyethoxyphenyl) sulfide, bis (4-methacryloxydiethoxyphenyl) sulfide, bis (4-acryloxydiethoxyphenyl) sulfide, bis (4-methacryloxytriethoxyphenyl) sulfide, bis (4-acryloxytri) Ethoxyphenyl) sulfide, bis (4-acryloxytriethoxyphenyl) sulfide, bis (4-methacryloxyethoxy-3-methylphenyl) sulfide, bis (4-acryloxyethoxy-3-methylphenyl) sulfide, bis (4 -Meta Liloxyethoxydiethoxy-3-methylphenyl) sulfide, bis (4-acryloxydiethoxy-3-methylphenyl) sulfide, bis (4-methacryloxyethoxy-3-chlorophenyl) sulfide, bis (4-acryloxyethoxy) -3-chlorophenyl) sulfide, bis (4-methacryloxyethoxydiethoxy-3-chlorophenyl) sulfide, bis (4-acryloxydiethoxy-3-chlorophenyl) sulfide, bis (4-methacryloxyethoxy-3-bromophenyl) ) Sulfide, bis (4-acryloxyethoxy-3-bromophenyl) sulfide, bis (4-methacryloxydiethoxy-3-bromophenyl) sulfide, bis (4-acryloxydiethoxy-3-bromophenyl) sulfide, etc. But It is below.

  Among these, bis (4-methacryloxyethoxyphenyl) sulfide, bis (4-acryloxyethoxyphenyl) sulfide, bis (4-methacryloxyethoxydiethoxyphenyl) sulfide, bis (4-acryloxydiethoxyphenyl) sulfide Bis (4-methacryloxyethoxy-3-methylphenyl) sulfide, bis (4-acryloxyethoxy-3-methylphenyl) sulfide, bis (4-methacryloxydiethoxy-3-methylphenyl) sulfide, bis (4 -Acryloxydiethoxy-3-methylphenyl) sulfide is more preferred.

(D) Sulfur-containing aromatic compound containing one (meth) acryloyl group in one molecule Preferably, the compound shown by general formula (IV) and general formula (V) is mentioned.

Formula (IV)

General formula (V)

In the formula, R ₃ represents hydrogen or a methyl group, Y represents chlorine, bromine or iodine, R ₄ represents —O—CH ₂ CH ₂ —, —O—CH (CH ₃ ) CH ₂ —, or —O—CH. ₂ CH (OH) CH ₂ —, p is an integer of 0 to 5, q is an integer of 0 to 4, and r is an integer of 0 to 3.

  The compound represented by the general formula (IV) or the general formula (V) is a monoalkylene-modified product having at least one substituted or unsubstituted thiophenyl group or a substituted or unsubstituted thiobiphenyl group in the molecule ( (Meth) acrylate.

  In the general formula (IV) or (V), when r is 1 or more, the stability of the compound is improved, and yellowing of the optical film is suppressed. Moreover, when r is 3 or less, heat-and-moisture resistance and a refractive index can be improved.

  Specific examples of the compound represented by the general formula (IV) include phenylthioethyl (meth) acrylate, phenylthioethoxyethyl (meth) acrylate, phenylthiodiethoxyethylthio (meth) acrylate, phenylthio-1-methylethyl ( (Meth) acrylate, phenylthio-1-methylethoxy-1-methylethyl (meth) acrylate, 3-phenylthio-2-hydroxypropyl (meth) acrylate, 2-chlorophenylthioethyl (meth) acrylate, 2-bromophenylthioethyl ( (Meth) acrylate, 2,4-dibromophenylthioethyl (meth) acrylate, 3- (2-bromophenylthio) -2-hydroxypropyl (meth) acrylate, 3- (2,4-dibromophenylthio) -2- Hydroxypropyl Meth) acrylate, 2-phenyl-phenylthioethyl (meth) acrylate.

  Specific examples of the compound represented by the general formula (V) include 4-phenylphenylthioethyl (meth) acrylate, 2-phenylphenylthio-1-methylethyl (meth) acrylate, 4-phenylphenylthio-1 -Methylethyl (meth) acrylate, 3- (2-phenylphenylthio) -2-hydroxypropyl (meth) acrylate, 3- (4-phenylphenylthio) -2-hydroxypropyl (meth) acrylate, etc. .

  Among these, phenylthioethyl (meth) acrylate, phenylthioethoxyethyl (meth) acrylate, phenylthio-1-methylethyl (meth) acrylate, phenylthio-1-methylethoxy-1-methylethyl (meth) acrylate, 3- Phenylthio-2-hydroxypropyl (meth) acrylate, 2-phenylphenylthioethyl (meth) acrylate, 2-phenylphenylthio-1-methylethyl (meth) acrylate, 3- (2-phenylphenylthio) -2-hydroxy Propyl (meth) acrylate is more preferred.

In the present invention, a compound having a fluorene skeleton as an aromatic is also preferable, and a resin containing epoxy acrylate as a polymerizable functional group is also preferable. Specific examples of the compound include the compounds of Examples 1 and 2 described in JP-A-7-48424.
In addition to the above, it is known as a photopolymerizable resin having a high refractive index. And polymerizable aromatic compounds described in JP-A-9-111189 can be used.

  The amount of the compound forming the binder having an aromatic group used for the conductive particles is in the range of 3 to 100 parts by mass with respect to 100 parts by mass of the conductive particles, so that the antistatic layer itself has an excessively high refractive index. In view of the ability to form an intermediate refractive index region, it is more preferably in the range of 3 to 60 parts by mass, and most preferably 6 to 30 parts by mass.

2-1-3. (Inorganic fine particles having a refractive index of 1.55 or more)
Further, the AS layer preferably contains inorganic fine particles having a refractive index of 1.55 or more that do not have substantial conductivity. Having no substantial conductivity means inorganic particles having a volume resistance of 5000 Ω / cm or more, and at least one selected from titanium, zirconium, indium, zinc, tin, antimony, silicon, and aluminum. The metal oxide can be contained. The average particle size of the highly refractive fine particles is preferably from 0.1 to 100 nm, more preferably from 0.5 to 50 nm, and most preferably from 1 to 30 nm.

Specific examples of such high refractive index inorganic fine particles include TiO ₂ , ZrO ₂ , Al ₂ O ₃ , and the like. ZrO ₂ is particularly preferable from the viewpoint of high refractive index and dispersion stability. Further, these particles and SiO ₂ may have a core shell type structure or may form a mixed crystal. The refractive index of these inorganic fine particles is preferably 1.55 to 2.50, more preferably 1.58 to 2.30. When particles having a refractive index higher than this range are used, the refractive index of the AS layer itself becomes too high, and the refractive index difference from the adjacent N layer increases, which tends to increase interference unevenness. Further, when particles having a refractive index lower than this range are used, the effect of increasing the refractive index of the diffused region is small even when the particles are diffused, and the effect of reducing interference unevenness is reduced.

In the case of using TiO ₂ , TiO ₂ alone is not preferable because the refractive index is too high, but the particles containing TiO ₂ as the main component are at least selected from Co (cobalt), Al (aluminum), and Zr (zirconium). By containing one element, the refractive index can be lowered. Also it is possible to suppress the photocatalytic activity of TiO ₂ has these methods, it is possible to improve the weather resistance of the film of the present invention. A particularly preferable element is Co (cobalt). It is also preferable to use two or more types in combination. The inorganic particles containing TiO ₂ as a main component may have a core / shell structure by surface treatment as described in JP-A No. 2001-166104.

The particle size of the inorganic fine particles is preferably smaller than that of the conductive particles, and more preferably 60% or less of the average particle size of the conductive particles. The surface of the inorganic fine particles is preferably surface-treated with an organic group and the cohesiveness between the inorganic particles is reduced, so that the decrease in diffusibility due to the aggregation of the inorganic fine particles is reduced.
The amount of the inorganic fine particles used with respect to the conductive particles is preferably in the range of 3 to 100 parts by weight, more preferably in the range of 3 to 60 parts by weight, with respect to 100 parts by weight of the conductive particles, and 6 to 30. Most preferably, it is part by mass.

2-1-4. (Dispersant for conductive particles)
In the coating composition, the conductive particles are preferably dispersed in a dispersion medium in the presence of a dispersant. By dispersing using a dispersant, the conductive particles can be dispersed very finely, making it possible to produce a transparent antistatic layer.
For dispersing the conductive particles used in the present invention, it is preferable to use a dispersant having an anionic group. As the anionic group, a group having an acidic proton such as a carboxyl group, a sulfonic acid group (sulfo group), a phosphoric acid group (phosphono group), a sulfonamide group, or a salt thereof is effective. Group, phosphoric acid group or a salt thereof are preferred, and carboxyl group and phosphoric acid group are particularly preferred.

  The number of anionic groups contained in the dispersant per molecule may be one or more. For the purpose of further improving the dispersibility of the conductive particles, the dispersant may contain a plurality of anionic groups per molecule. The average number per molecule is preferably 2 or more, more preferably 5 or more, and particularly preferably 10 or more. Moreover, the anionic group contained in a dispersing agent may contain multiple types in 1 molecule.

  Examples of the dispersant having an anionic polar group include “phosphanol” {PE-510, PE-610, LB-400, EC-6103, RE-410 and the like; manufactured by Toho Chemical Industry Co., Ltd.}, “Disperbyk” (-110, -111, -116, -140, -161, -162, -163, -164, -170, -171, etc .; as described above, manufactured by Big Chemie Japan).

  The dispersant preferably further contains a crosslinkable or polymerizable functional group. Examples of the crosslinkable or polymerizable functional group include an ethylenically unsaturated group {for example, a (meth) acryloyl group, an allyl group, a styryl group, a vinyloxy group, etc.} that can undergo a crosslinking reaction / polymerization reaction with a radical species, a cationic polymerizable group (Epoxy group, oxatanyl group, vinyloxy group, etc.), polycondensation reactive group (hydrolyzable silyl group, N-methylol group) and the like can be mentioned, and a functional group having an ethylenically unsaturated group is preferred.

  The dispersant used for dispersing the conductive particles in the antistatic layer in the present invention has an anionic group and a crosslinkable or polymerizable functional group, and the crosslinkable or polymerizable functional group is a side chain. It is particularly preferable that the dispersant is included in

  The weight average molecular weight (Mw) of the above-described dispersant particularly preferable in the present invention is not particularly limited, but is preferably 1000 or more. The dispersant preferably has a mass average molecular weight (Mw) of 2,000 to 1,000,000, more preferably 5,000 to 200,000, and particularly preferably 10,000 to 100,000.

  The amount of the dispersant used relative to the conductive particles is preferably in the range of 1 to 50 parts by weight, more preferably in the range of 5 to 30 parts by weight, with respect to 100 parts by weight of the conductive particles. Most preferably, it is part by mass. Two or more dispersants may be used in combination.

In the present invention, inorganic particles having a refractive index of 1.55 or more different from the conductive particles can be dispersed using a dispersant in the same manner as the conductive particles, and a dispersant having an anionic group is preferable. Further, it is particularly preferable to treat the surface of the inorganic particles with a coupling agent or an organosilane compound containing atoms such as Al, Ti and Zr that strongly interact with the surface of the inorganic particles to make them hydrophobic. By using these treatment agents, compared to the conductive particles, the diffusion of the particles to the adjacent layer at the time of coating becomes easy, and the effect of reducing unevenness of the present invention is easily exhibited. As the Al, Ti, Zr-based coupling agent, compounds described in JP-A 2003-96400 [0039] to [0040] and JP-A 2000-47004 [0050] are preferable. Examples of the organosilane compound include compounds described in [0025] to [0031] and [0037] to [0039] of JP-A No. 2005-307158, and [0052] to [0056] of JP-A No. 11-43319. Are preferred.

2-1-5. (Dispersion medium of conductive particles)
As the dispersion medium, a liquid having a boiling point of 60 to 170 ° C. is preferably used. Examples of dispersion media include water, alcohols (eg, methanol, ethanol, isopropanol, butanol, benzyl alcohol), ketones (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone), esters (eg, methyl acetate, Ethyl acetate, propyl acetate, butyl acetate, methyl formate, ethyl formate, propyl formate, butyl formate), aliphatic hydrocarbons (eg hexane, cyclohexane), halogenated hydrocarbons (eg methylene chloride, chloroform, carbon tetrachloride) , Aromatic hydrocarbons (eg, benzene, toluene, xylene), amides (eg, dimethylformamide, dimethylacetamide, n-methylpyrrolidone), ethers (eg, diethyl ether, dioxane, tetrahydrofurane) ), Ether alcohols (e.g., 1-methoxy-2-propanol) are included. In addition, propylene glycol monoalkyl ether (alkyl group having 1 to 4 carbon atoms) or propylene glycol monoalkyl ether ester (alkyl group having 1 to 4 carbon atoms) is excellent in dispersibility and preferable. Among these, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, butanol and propylene glycol monoethyl ether are preferable.
Particularly preferred dispersion media are methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, propylene glycol monoethyl ether.

2-1-6. (Other binders)
Other binders can be used for the AS layer in addition to the binder having the aromatic group. As the other binder-forming compound, a non-curable thermoplastic resin, or a curable resin such as a thermosetting resin or an ionizing radiation curable resin can be used. From the viewpoint of increasing the hardness of the coating film, a curable resin is preferably used, and an ionizing radiation curable monomer or a cationic polymerizable monomer having a radical polymerizable group is particularly preferable.

The ionizing radiation curable resin having a radical polymerizable group will be described below.
Examples of the radical polymerizable group include ethylenically unsaturated groups such as a (meth) acryloyl group, a vinyloxy group, a styryl group, and an allyl group. Among them, a (meth) acryloyl group is preferable. The radical polymerizable group preferably contains a polyfunctional monomer having two or more radical polymerizable groups in the molecule. Two or more kinds of polyfunctional monomers having a radical polymerizable group may be used in combination.

  The radical polymerizable polyfunctional monomer is preferably selected from compounds having at least two terminal ethylenically unsaturated bonds. Preferably, it is a compound having 2 to 6 terminal ethylenically unsaturated bonds in the molecule. Such a compound group is widely known in the polymer material field, and these can be used without particular limitation in the present invention. These can have chemical forms such as, for example, monomers, prepolymers, ie dimers, trimers or oligomers, or mixtures or copolymers thereof.

  Examples of radically polymerizable monomers include unsaturated carboxylic acids (for example, (meth) acrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters thereof, and amides, preferably Examples include esters of unsaturated carboxylic acids and aliphatic polyhydric alcohol compounds, and amides of unsaturated carboxylic acids and aliphatic polyvalent amine compounds. In addition, unsaturated carboxylic acid esters having nucleophilic substituents such as hydroxyl group, amino group, mercapto group, amides, monofunctional or polyfunctional isocyanates, addition products of epoxies, polyfunctional A dehydration condensation reaction product with a carboxylic acid is also preferably used. A reaction product of an unsaturated carboxylic acid ester or amide having an electrophilic substituent, such as an isocyanate group or an epoxy group, and a monofunctional or polyfunctional alcohol, amine or thiol is also suitable. . As another example, it is also possible to use a group of compounds substituted with unsaturated phosphonic acid, styrene or the like instead of the unsaturated carboxylic acid.

  Examples of the aliphatic polyhydric alcohol compound include alkanediol, alkanetriol, cyclohexanediol, cyclohexanetriol, inositol, cyclohexanedimethanol, pentaerythritol, sorbitol, dipentaerythritol, tripentaerythritol, glycerin, diglycerin and the like. Polymerizable ester compounds (monoesters or polyesters) of these aliphatic polyhydric alcohol compounds and unsaturated carboxylic acids, for example, compounds described in JP-A No. 2001-139663, paragraph numbers [0026] to [0027]. .

  Examples of other polymerizable esters include, for example, vinyl (meth) acrylate, allyl (meth) acrylate, JP-B-46-27926, JP-B-51-47334, and JP-A-57-196231. The aliphatic alcohol esters described above, those having an aromatic skeleton described in JP-A-2-226149, and those having an amino group described in JP-A-1-165613 are also preferably used.

  Specific examples of polymerizable amides formed from an aliphatic polyvalent amine compound and an unsaturated carboxylic acid include methylene bis- (meth) acrylamide, 1,6-hexamethylene bis- (meth) acrylamide, diethylenetriamine tris ( Examples include meth) acrylamide, xylylene bis (meth) acrylamide, and those having a cyclohexylene structure described in JP-B No. 54-21726.

Also, vinyl urethane compounds containing two or more polymerizable vinyl groups in one molecule (Japanese Patent Publication No. 48-41708), urethane acrylates (Japanese Patent Publication No. 2-16765, Japanese Patent Application Laid-Open No. 2005-272702). Exemplary compounds PETA-IPDI-PETA, PETA-TDI-PETA, HEA-IPDI-HEA, U-15HA, etc.), urethane compounds having an ethylene oxide skeleton (Japanese Patent Publication No. 62-39418), polyester acrylates (special Further, photocurable monomers and oligomers described in “Journal of Japan Adhesion Association”, Vol. 20, No. 7, pages 300 to 308 (1984) can also be used.
In particular, examples of the high refractive index monomer include bis (4-methacryloylthiophenyl) sulfide, vinyl naphthalene, vinyl phenyl sulfide, 4-methacryloxyphenyl-4′-methoxyphenyl thioether, and the like.

  In order to reduce the diffusibility of the monomer itself and increase the strength of the cured film, compounds of isocyanuric acid ethoxy-modified diacrylate (described in JP-A-2005-103973) described below are also preferable.

Specific examples of the isocyanuric acid acrylate compound include Aronix M-215 manufactured by Toagosei Co., Ltd.
The above compound can form a coating film having low curl and excellent scratch resistance when used in combination with a trifunctional or higher functional acrylate.

  In addition, as a compound having a high molecular weight, excellent diffusion resistance, and a high crosslinking group density, a curable multi-branched polymer in which a multi-branched polymer is used as a nucleus and a curable reactive group is bonded to the end of the branched branch is used. It is also preferable. Specific compounds described in paragraph Nos. 0045 to 0099 of JP-A-2006-10829 can be used.

Hereinafter, another preferred embodiment of the cationic polymerizable monomer will be described.
As the cationic polymerizable monomer, the number of cationic polymerizable groups in one molecule is preferably 2 to 10, particularly preferably 2 to 5. The molecular weight of the compound is preferably 3000 or less, more preferably in the range of 200 to 2000, particularly preferably in the range of 400 to 1500. If it is this range, volatilization in a film formation process does not become a problem, and there is no problem also in the point of compatibility with the compound for binder formation, and it is preferable.
Examples of the epoxy compound that is one of the cationic polymerizable monomers include aliphatic epoxy compounds and aromatic epoxy compounds.

  Examples of the aliphatic epoxy compound include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof, polyglycidyl esters of aliphatic long-chain polybasic acids, homopolymers and copolymers such as glycidyl (meth) acrylate, and the like. be able to. In addition to the above epoxy compounds, for example, monoglycidyl ethers of higher aliphatic alcohols, glycidyl esters of higher fatty acids, epoxidized soybean oil, butyl epoxide stearate, octyl epoxide stearate, epoxidized linseed oil, epoxidized polybutadiene, etc. Can be mentioned. Examples of the alicyclic epoxy compound include polyglycidyl ether of polyhydric alcohol having at least one alicyclic ring, or unsaturated alicyclic ring (for example, cyclohexene, cyclopentene, dicyclooctene, tricyclodecene, etc. ) Cyclohexene oxide or cyclopentene oxide-containing compound obtained by epoxidizing the containing compound with a suitable oxidizing agent such as hydrogen peroxide or peracid.

  Examples of the aromatic epoxy compound include mono- or polyglycidyl ethers of mono- or polyhydric phenols having at least one aromatic nucleus or alkylene oxide adducts thereof. As these epoxy compounds, for example, compounds described in paragraphs [0084] to [0086] of JP-A No. 11-242101, paragraph numbers [0044] to [0046] of JP-A No. 10-158385, and the like. And the compounds described.

  Among these epoxy compounds, aromatic epoxides and alicyclic epoxides are preferable, and alicyclic epoxides are particularly preferable in consideration of rapid curability. In the present invention, one of the above epoxy compounds may be used alone, but two or more may be used in appropriate combination.

  A cyclic thioether compound may be used, and examples thereof include compounds in which the epoxy ring is a thioepoxy ring.

A compound containing an oxetanyl group as a cyclic ether may be used, and specific examples include the compounds described in paragraphs [0024] to [0025] of JP-A No. 2000-239309. These compounds are preferably used in combination with an epoxy group-containing compound.

  Spiro ortho ester compounds may be used, and examples thereof include compounds described in JP-T-2000-506908.

When the other binder is used in the AS layer, the molecular weight of the other binder is preferably 250 to 5000, and more preferably 400 to 3000.
Moreover, it is preferable to set it as 10-70 mass parts with respect to 100 mass parts of electroconductive particles, and, as for the usage-amount of said other binder, it is still more preferable to set it as 15-40 mass parts.
The refractive index of the AS layer is preferably 1.53 to 2.10, and preferably 1.58 to 1.80 from the viewpoint of adding conductivity using general-purpose conductive particles. Further preferred.
Further, the surface resistance value when the coating layer is not formed on the AS layer showing the antistatic performance of the AS layer is from 1 × 10 ⁵ Ω / □ to accelerate the charge leakage of the optical film and impart dust resistance. It is preferably 1 × 10 ¹² Ω / □, and more preferably 1 × 10 ⁶ Ω / □ to 1 × 10 ¹¹ Ω / □.

2-1-7. (Polymerization initiator)
The AS layer can contain a polymerization initiator triggered by ionizing radiation or heat.

[Photo radical polymerization initiator]
Examples of photo radical polymerization initiators include acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, azo compounds, peroxides (JP-A No. 2001-139663, etc.), 2, 3 -Dialkyldione compounds, disulfide compounds, fluoroamine compounds, aromatic sulfoniums, lophine dimers, onium salts, borate salts, active esters, active halogens, inorganic complexes, coumarins and the like.

These initiators may be used alone or in combination.
“Latest UV Curing Technology”, Technical Information Association, 1991, p. 159, and “UV curing system” written by Kayo Kiyomi, 1989, General Technology Center, p. Various examples are also described in 65-148 and are useful in the present invention.

  Commercially available radical photopolymerization initiators include KAYACURE (DETX-S, BP-100, BDKM, CTX, BMS, 2-EAQ, ABQ, CPTX, EPD, ITX, QTX, BTC, manufactured by Nippon Kayaku Co., Ltd. MCA, etc.), Irgacure (651, 184, 500, 819, 907, 369, 1173, 1870, 2959, 4265, 4263, etc.) manufactured by Ciba Specialty Chemicals Co., Ltd., Esacure (KIP100F, KB1, manufactured by Sartomer) EB3, BP, X33, KT046, KT37, KIP150, TZT) and the like and combinations thereof are preferred examples.

  It is preferable to use a photoinitiator in the range of 0.1-15 mass parts with respect to 100 mass parts of polyfunctional monomers, More preferably, it is the range of 1-10 mass parts.

[Thermal initiator]
As the thermal radical initiator, organic or inorganic peroxides, organic azo, diazo compounds, and the like can be used.
Specifically, benzoyl peroxide, halogen benzoyl peroxide, lauroyl peroxide, acetyl peroxide, dibutyl peroxide, cumene hydroperoxide, butyl hydroperoxide as organic peroxides, hydrogen peroxide, peroxides as inorganic peroxides. Diazo compounds such as 2,2′-azobis (isobutyronitrile), 2,2′-azobis (propionitrile), 1,1′-azobis (cyclohexanecarbonitrile) as azo compounds such as ammonium sulfate and potassium persulfate And diazoaminobenzene, p-nitrobenzenediazonium and the like.

[Photoacid generator]
Examples of the photoacid generator include (1) various onium salts such as iodonium salts, sulfonium salts, phosphonium salts, diazonium salts, ammonium salts, pyridinium salts; (2) β-ketoesters, β-sulfonylsulfones and their α -Sulfone compounds such as diazo compounds; (3) Sulfonic esters such as alkyl sulfonates, haloalkyl sulfonates, aryl sulfonates, imino sulfonates; (4) Sulfonimide compounds; (5) Diazomethane compounds; Others can be mentioned and can be used as appropriate.

  The photoacid generator can be used alone or in combination of two or more, and can also be used in combination with the thermal acid generator. The use ratio of the photosensitive acid generator is preferably 0 to 20 parts by mass, more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the binder-forming compound. If the ratio of the photosensitive acid generator is less than or equal to the upper limit, it is preferable because the resulting cured film has excellent strength and good transparency.

The use ratio of the photosensitive acid generator is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the binder-forming compound.
In addition, as specific compounds and methods of use, for example, the contents described in JP-A-2005-43876 can be used.

2-1-8. (Surface improver)
The coating liquid used to produce any layer on the support has at least one of fluorine and silicone surfaces to improve surface defects (coating irregularities, drying irregularities, point defects, etc.) It is preferable to add a state improver.

  The surface improver preferably changes the surface tension of the coating solution by 1 mN / m or more. Here, when the surface tension of the coating liquid changes by 1 mN / m or more, the surface tension of the coating liquid after the addition of the surface conditioner is added, including the concentration process during coating / drying. It means that it changes by 1 mN / m or more as compared with the surface tension of the coating liquid that has not been applied. Preferably, it is a surface conditioner that has the effect of lowering the surface tension of the coating solution by 1 mN / m or more, more preferably a surface conditioner that lowers by 2 mN / m or more, and particularly preferably a surface conditioner that lowers by 3 mN / m or more. .

  Preferable examples of the fluorine-based surface improver include compounds containing a fluoroaliphatic group. Examples of preferred compounds include those described in JP-A-2005-115359, JP-A-2005-221963, and JP-A-2005-234476.

2-1-9. (Coating solvent)
As a solvent used in the coating composition for forming the AS layer of the present invention, it is possible to dissolve or disperse each component, to easily form a uniform surface in the coating process and the drying process, and to ensure liquid storage stability. It is possible to use various solvents selected from the viewpoints of being able to be used and having an appropriate saturated vapor pressure.
Two or more kinds of solvents can be mixed and used. In particular, from the viewpoint of drying load, it is preferable that a solvent having a boiling point of 100 ° C. or lower at normal pressure and room temperature as a main component and a small amount of solvent having a boiling point of 100 ° C. or higher for adjusting the drying speed.

  Examples of the solvent having a boiling point of 100 ° C. or lower include hydrocarbons such as hexane (boiling point 68.7 ° C.), heptane (98.4 ° C.), cyclohexane (80.7 ° C.), benzene (80.1 ° C.), Halogenated carbonization such as dichloromethane (39.8 ° C), chloroform (61.2 ° C), carbon tetrachloride (76.8 ° C), 1,2-dichloroethane (83.5 ° C), trichloroethylene (87.2 ° C) Hydrogens, diethyl ether (34.6 ° C), diisopropyl ether (68.5 ° C), dipropyl ether (90.5 ° C), ethers such as tetrahydrofuran (66 ° C), ethyl formate (54.2 ° C), Esters such as methyl acetate (57.8 ° C.), ethyl acetate (77.1 ° C.), isopropyl acetate (89 ° C.), acetone (56.1 ° C.), 2-butanone (methyl ether) Ketones such as Luketone, 79.6 ° C, methanol (64.5 ° C), ethanol (78.3 ° C), 2-propanol (82.4 ° C), 1-propanol (97.2 ° C), etc. Alcohols, cyano compounds such as acetonitrile (81.6 ° C.), propionitrile (97.4 ° C.), carbon disulfide (46.2 ° C.), and the like. Of these, ketones and esters are preferable, and ketones are particularly preferable. Among the ketones, 2-butanone is particularly preferable.

  Examples of the solvent having a boiling point of 100 ° C. or more include, for example, octane (125.7 ° C.), toluene (110.6 ° C.), xylene (138 ° C.), tetrachloroethylene (121.2 ° C.), and chlorobenzene (131.7 ° C.). , Dioxane (101.3 ° C), dibutyl ether (142.4 ° C), isobutyl acetate (118 ° C), cyclohexanone (155.7 ° C), 2-methyl-4-pentanone (same as MIBK, 115.9 ° C) 1-butanol (117.7 ° C.), N, N-dimethylformamide (153 ° C.), N, N-dimethylacetamide (166 ° C.), dimethyl sulfoxide (189 ° C.) and the like. Cyclohexanone and 2-methyl-4-pentanone are preferable.

2-2. (N layer)
Next, the N layer will be described.
The N layer is a high-hardness layer formed next to the AS layer, which is formed of a non-conductive and further curable binder-forming compound. The N layer also preferably serves as a hard coat layer in order to increase the pencil hardness of the optical film. As the N-layer curable binder-forming compound, those described in the section of (other binder) of the AS layer can be used. Particularly in the N layer, the preferable molecular weight of the other binder-forming compound is that the diffusion of an unnecessary component from the AS layer can be suppressed by allowing a component having a high molecular weight to coexist in the binder-forming compound. To 5000, more preferably 350 to 5000, and most preferably 400 to 3000.
In addition, as a constituent component of the N layer, the polymerization initiator, the surface conditioner, the diluting solvent, the inorganic / organic / organic / inorganic hybrid particles described in the AS layer, and the like within a range not impairing the desired effect of the present invention. Can be used.

The refractive index of the N layer is preferably 1.45 to 1.53, more preferably 1.48 to 1.53, from the viewpoint of improving the hardness of the layer.
Further, the surface resistance indicating the conductive performance of the N layer is 1 × 10 ¹³ Ω / □ or more as measured by a film obtained by applying and curing the N layer itself to a triacetyl cellulose film with a thickness of 30 μm.

2-3. (Layer area)
Next, the layer region will be described.
The layer region is preferably a layer in any one of the first to third modes as described above, and is a layer formed by mixing the components of the AS layer and the components of the N layer. is there. By comparing the mass ratio (AR / P) of the binder having an aromatic group to the conductive particles in the AS layer forming coating solution itself and the layer region, the aromatic group-containing binder forming compound is conductive in the layer region. The degree of diffusion preferentially over the particles can be estimated. (AR / P) in the layer region with respect to (AR / P) of the AS layer coating solution is preferably 1.10 or more, and 2.0 or more and 100.
0 or less is more preferable.
The refractive index of the layer region is preferably N (n) + 0.05ΔN to N (n) + 0.95ΔN from the viewpoint of reducing interference unevenness, and N (n) + 0.30ΔN. It is more preferable that N (n) + 0.70ΔN.

3. (Other constituent layers of the optical film of the present invention)
3-1. (Hard coat layer)
In order to give the physical strength of the film to the optical film of the present invention, a hard coat layer can be preferably provided on one surface of the support. The hard coat layer may be composed of a laminate of two or more layers.

The film thickness of the hard coat layer is usually about 0.5 μm to 50 μm, preferably 1 μm to 20 μm, more preferably 2 μm to 10 μm, and most preferably 3 μm, from the viewpoint of imparting sufficient durability and impact resistance to the film. ~ 7 μm.
Further, the strength of the hard coat layer is preferably H or more, more preferably 2H or more, and most preferably 3H or more in a pencil hardness test.
Furthermore, in the Taber test according to JIS K5400, the smaller the wear amount of the test piece before and after the test, the better.

The hard coat layer is preferably formed by a crosslinking reaction or a polymerization reaction of an ionizing radiation curable compound. For example, it can be formed by coating a coating composition containing an ionizing radiation-curable polyfunctional monomer or polyfunctional oligomer on a support and causing the polyfunctional monomer or polyfunctional oligomer to undergo a crosslinking reaction or a polymerization reaction. .
The functional group of the ionizing radiation-curable polyfunctional monomer or polyfunctional oligomer is preferably a light, electron beam, or radiation polymerizable group, and among them, a photopolymerizable functional group is preferable.
Examples of the photopolymerizable functional group include unsaturated polymerizable functional groups such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group. Among them, a (meth) acryloyl group is preferable. Moreover, when using the polyfunctional monomer and oligomer which have a photopolymerizable functional group, it is preferable to use together the photoradical polymerization initiator mentioned later.

  Instead of or in addition to the monomer having a polymerizable unsaturated group, a crosslinkable functional group may be introduced into the binder. Examples of the crosslinkable functional group include isocyanate group, epoxy group, aziridine group, oxazoline group, aldehyde group, carbonyl group, hydrazine group, carboxyl group, methylol group and active methylene group. Vinylsulfonic acid, acid anhydrides, cyanoacrylate derivatives, melamine, etherified methylol, esters and urethanes, and metal alkoxides such as tetramethoxysilane can also be used as monomers having a crosslinked structure. A functional group that exhibits crosslinkability as a result of the decomposition reaction, such as a block isocyanate group, may be used. That is, in the present invention, the crosslinkable functional group may not react immediately but may exhibit reactivity as a result of decomposition. The binder having these crosslinkable functional groups can form a crosslinked structure by heating after coating.

  For the purpose of controlling the refractive index of the hard coat layer, a high refractive index monomer, inorganic particles, or both can be added to the binder of the hard coat layer. In addition to the effect of controlling the refractive index, the inorganic particles also have the effect of suppressing cure shrinkage due to the crosslinking reaction. In the present invention, a polymer formed by polymerizing the polyfunctional monomer and / or the high refractive index monomer after the hard coat layer is formed, and the inorganic particles dispersed therein are referred to as a binder.

The haze of the hard coat layer varies depending on the function imparted to the optical film.
In the case where the sharpness of the image is maintained, the reflectance of the surface is suppressed, and the light scattering function is not imparted inside and on the surface of the hard coat layer, the haze value is preferably as low as possible, specifically 10% or less is preferable. More preferably, it is 5% or less, and most preferably 2% or less.

  In addition, for the surface irregularity shape of the hard coat layer, in order to obtain a clear surface for the purpose of maintaining the sharpness of the image, among the characteristics indicating the surface roughness, for example, the centerline average roughness (Ra) is set. It is preferable to be 0.08 μm or less. Ra is more preferably 0.07 μm or less, and still more preferably 0.06 μm or less. In the film of the present invention, the surface unevenness of the hard coat layer is dominant to the surface unevenness of the film, and the center line average roughness of the antireflection film is adjusted by adjusting the center line average roughness of the hard coat layer. It can be set as the said range.

  Further, the polymerization initiator, the surface conditioner, the diluent solvent, etc. described in the AS layer can be used in the composition for forming the hard coat layer as long as the desired effects of the present invention are not impaired.

3-2. (High refractive index layer, medium refractive index layer)
When the optical film of the present invention is provided with a high refractive index layer and a medium refractive index layer and optical interference is used together with a low refractive index layer described later, the antireflection property can be enhanced.
In the following specification, the high refractive index layer and the medium refractive index layer may be collectively referred to as a high refractive index layer. In the present invention, “high”, “medium”, and “low” in the high refractive index layer, medium refractive index layer, and low refractive index layer represent the relative refractive index relationship between the layers. In terms of the relationship with the transparent support, the refractive index preferably satisfies the relationship of transparent support> low refractive index layer, high refractive index layer> transparent support.
In the present specification, the high refractive index layer, the middle refractive index layer, and the low refractive index layer may be collectively referred to as an antireflection layer.

  In order to construct an antireflection film by constructing a low refractive index layer on a high refractive index layer, the refractive index of the high refractive index layer is preferably 1.55 to 2.40, more preferably It is 1.60 to 2.20, more preferably 1.65 to 2.10, and most preferably 1.80 to 2.00.

  When an antireflective film is prepared by coating a medium refractive index layer, a high refractive index layer, and a low refractive index layer in order from the support, the refractive index of the high refractive index layer is 1.65 to 2.40. Preferably, it is 1.70 to 2.20. The refractive index of the middle refractive index layer is adjusted to be a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the middle refractive index layer is preferably 1.55 to 1.80.

Specific examples of the inorganic particles used for the high refractive index layer and the medium refractive index layer include TiO ₂ , ZrO ₂ , Al ₂ O ₃ , In ₂ O ₃ , ZnO, SnO ₂ , Sb ₂ O ₃ , ITO and SiO _2. Etc. TiO ₂ and ZrO ₂ are particularly preferable in terms of increasing the refractive index. The inorganic filler is preferably subjected to a silane coupling treatment or a titanium coupling treatment on the surface, and a surface treatment agent having a functional group capable of reacting with a binder species on the filler surface is preferably used.

The content of the inorganic particles in the high refractive index layer is preferably 10 to 90% by mass, more preferably 15 to 80% by mass, and particularly preferably 15 to 75% by mass with respect to the mass of the high refractive index layer. . Two or more kinds of inorganic particles may be used in combination in the high refractive index layer.
When the low refractive index layer is provided on the high refractive index layer, the refractive index of the high refractive index layer is preferably higher than the refractive index of the transparent support.
The high refractive index layer contains an ionizing radiation curable compound containing an aromatic ring, an ionizing radiation curable compound containing a halogenated element other than fluorine (for example, Br, I, Cl, etc.), and atoms such as S, N, P, etc. A binder obtained by a crosslinking or polymerization reaction such as an ionizing radiation curable compound can also be preferably used.

  The film thickness of the high refractive index layer can be appropriately designed depending on the application. When using a high refractive index layer as an optical interference layer, 30-200 nm is preferable, More preferably, it is 50-170 nm, Most preferably, it is 60-150 nm.

  The haze of the high refractive index layer is preferably as low as possible when it does not contain particles that impart an antiglare function. It is preferably 5% or less, more preferably 3% or less, and particularly preferably 1% or less. The high refractive index layer is preferably constructed directly on the transparent support or via another layer.

  In addition, the polymerization initiator, the surface conditioner, the diluting solvent, etc. described in the AS layer are used in the composition for forming the high refractive index layer and the middle refractive index layer as long as the desired effects of the present invention are not impaired. Can do.

3-3. (Low refractive index layer)
In the optical film of the present invention, it is preferable to provide a low refractive index layer in order to reduce the reflectance of the optical film.
The refractive index of the low refractive index layer is preferably 1.20 to 1.46, more preferably 1.25 to 1.46, and particularly preferably 1.30 to 1.40.
The thickness of the low refractive index layer is preferably 50 to 200 nm, and more preferably 70 to 100 nm. The haze of the low refractive index layer is preferably 3% or less, more preferably 2% or less, and most preferably 1% or less. The specific strength of the low refractive index layer is preferably H or higher, more preferably 2H or higher, and most preferably 3H or higher in a pencil hardness test under a 500 g load.
Further, in order to improve the antifouling performance of the optical film, it is preferable that the contact angle of water on the surface is 90 degrees or more. More preferably, it is 95 degrees or more, and particularly preferably 100 degrees or more.
Preferred embodiments of the cured product composition include (1) a composition containing a fluorine-containing polymer having a crosslinkable or polymerizable functional group, and (2) a hydrolysis condensate of a fluorine-containing organosilane material as a main component. And (3) a composition containing a monomer having two or more ethylenically unsaturated groups and inorganic fine particles having a hollow structure.

(1) Fluorine-containing polymer having a crosslinkable or polymerizable functional group As the fluorine-containing polymer having a crosslinkable or polymerizable functional group, a copolymer of a fluorine-containing monomer and a monomer having a crosslinkable or polymerizable functional group is used. Coalescence can be mentioned. Examples of the fluorine-containing monomer include fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole, etc.), (meta ) Acrylic acid partial or fully fluorinated alkyl ester derivatives (for example, Biscoat 6FM (manufactured by Osaka Organic Chemicals) and M-2020 (manufactured by Daikin)), fully or partially fluorinated vinyl ethers and the like.

  As an example of the monomer for imparting a crosslinkable group, a (meth) acrylate monomer having a crosslinkable functional group in the molecule in advance such as glycidyl methacrylate can be exemplified. In another embodiment, after synthesizing a fluorinated copolymer using a monomer having a functional group such as a hydroxyl group, the monomer is further modified to introduce a crosslinkable or polymerizable functional group by modifying the substituent. It is. These monomers include (meth) acrylate monomers having a carboxyl group, hydroxyl group, amino group, sulfonic acid group, etc. (for example, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, etc.) Is mentioned. The latter embodiment is disclosed in Japanese Patent Laid-Open Nos. 10-25388 and 10-147739.

The fluorine-containing copolymer may contain a copolymerizable component as appropriate from the viewpoints of solubility, dispersibility, coating property, antifouling property, antistatic property and the like. In particular, for imparting antifouling properties and slipperiness, it is preferable to introduce silicone, and it can be introduced into both the main chain and the side chain.
The polysiloxane partial structure introduction method into the main chain is, for example, an azo group-containing polysiloxane amide described in JP-A-6-93100 (VPS-0501, 1001 (trade name; Wako Pure Chemical Industries, Ltd. And a method using a polymer-type initiator such as a company)). Further, the method of introducing into the side chain is, for example, as described in J. Appl. Polym. Sci. 2000, 78, 1955, JP-A-56-28219, etc. For example, a silaplane series (manufactured by Chisso Corporation) can be synthesized by a method of introducing a polymer reaction or a method of polymerizing a polysiloxane-containing silicon macromer, and both methods can be preferably used.

As described in JP 2000-17028 A, a curing agent having a polymerizable unsaturated group may be used in combination with the above polymer. Moreover, combined use with the compound which has a fluorine-containing polyfunctional polymerizable unsaturated group as described in Unexamined-Japanese-Patent No. 2002-145952 is also preferable. Examples of the compound having a polyfunctional polymerizable unsaturated group include the above-described monomers having two or more ethylenically unsaturated groups. Moreover, the hydrolysis-condensation product of the organolane described in Unexamined-Japanese-Patent No. 2004-170901 is also preferable, and the hydrolysis-condensation product of the organosilane containing a (meth) acryloyl group is especially preferable.
These compounds are particularly preferred because they have a large combined effect for improving scratch resistance, particularly when a compound having a polymerizable unsaturated group is used in the polymer body.

  When the polymer itself does not have sufficient curability, necessary curability can be imparted by blending a crosslinkable compound. For example, when the polymer body contains a hydroxyl group, various amino compounds are preferably used as the curing agent. The amino compound used as the crosslinkable compound is, for example, a compound containing one or both of a hydroxyalkylamino group and an alkoxyalkylamino group in total, specifically, for example, a melamine compound, Examples include urea compounds, benzoguanamine compounds, glycoluril compounds, and the like. For curing these compounds, an organic acid or a salt thereof is preferably used.

  Specific examples of these fluoropolymers are described in JP2003-222702A, JP2003-183322A, and the like.

(2) Hydrolyzed condensate of fluorine-containing organosilane material A composition containing a hydrolyzed condensate of a fluorine-containing organosilane compound as a main component is also preferable because of its low refractive index and high hardness on the coating film surface. A condensate of a tetraalkoxysilane with a compound containing hydrolyzable silanol at one or both ends with respect to the fluorinated alkyl group is preferred. The specific composition is described in Unexamined-Japanese-Patent No. 2002-265866, 317152.

(3) A composition containing a monomer having two or more ethylenically unsaturated groups and inorganic fine particles having a hollow structure As yet another preferred embodiment, a low refractive index layer comprising low refractive index particles and a binder can be mentioned. . The low refractive index particles may be organic or inorganic, but particles having pores inside are preferable. Specific examples of the hollow particles are described in the silica-based particles described in JP-A-2002-79616. The particle refractive index is preferably 1.15 to 1.40, more preferably 1.20 to 1.30. Examples of the binder include monomers having two or more ethylenically unsaturated groups described on the hard coat layer page.

  It is preferable to add a polymerization initiator usually used for polymerization of the above-mentioned radical polymerizable compound to the low refractive index layer. When a radically polymerizable compound is contained, 1 to 10 parts by mass, preferably 1 to 5 parts by mass of a polymerization initiator can be used with respect to the compound.

  In the low refractive index layer, inorganic particles can be used in combination. In order to impart scratch resistance, fine particles having a particle size of 15% to 150%, preferably 30% to 100%, more preferably 45% to 60% of the thickness of the low refractive index layer can be used. .

  For the purpose of imparting antifouling properties, water resistance, chemical resistance, slipping properties, etc., known polysiloxane-based or fluorine-based antifouling agents, slipping agents, etc. are appropriately added to the low refractive index layer. be able to.

3-4. (Support)
The support for the optical film of the present invention is not particularly limited, such as a transparent resin film, a transparent resin plate, a transparent resin sheet, and transparent glass. Transparent resin films include cellulose acylate films (for example, cellulose triacetate film (refractive index 1.48), cellulose diacetate film, cellulose acetate butyrate film, cellulose acetate propionate film), polyethylene terephthalate film, polyethersulfone. Film, polyacrylic resin film, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film, polymethylpentene film, polyetherketone film, (meth) acrylonitrile film polyolefin, alicyclic structure Polymer (norbornene resin (Arton: trade name, manufactured by JSR (refractive index: 1.51)), amorphous polyolefin Emissions (ZEONEX trade name, manufactured by Nippon Zeon Co., Ltd.) (refractive index of 1.53),), and the like. Of these, triacetyl cellulose, polyethylene terephthalate, and polymers having an alicyclic structure are preferable, and triacetyl cellulose is particularly preferable.
Although the thickness of a support body can use the thing of about 25 micrometers-1000 micrometers normally, Preferably it is 25 micrometers-250 micrometers, and it is more preferable that it is 30 micrometers-90 micrometers.
Any width of the support can be used, but from the viewpoint of handling, yield, and productivity, a width of 100 to 5000 mm is usually used, preferably 800 to 3000 mm, and preferably 1000 to 2000 mm. More preferably. The support can be handled in the form of a roll, and is usually 100 m to 5000 m, preferably 500 m to 3000 m.
The surface of the support is preferably smooth, and the average roughness Ra is preferably 1 μm or less, preferably 0.0001 to 0.5 μm, and 0.001 to 0.1 μm. Is more preferable.

<Cellulose acylate film>
Among the various films described above, a cellulose acylate film having high transparency, optically low birefringence, easy production, and generally used as a protective film for polarizing plates is preferable.
For cellulose acylate films, various improvement techniques are known for the purpose of improving mechanical properties, transparency, flatness and the like, and the techniques described in the published technical reports 2001-1745 are known as the present invention. It can be used for the film.

[Second to Fourth Inventions]
Hereinafter, the second to fourth inventions will be described, but the layer configuration and constituent components in the second to fourth inventions, and the most preferable aspect are the same as those of the first invention described above. Detailed description.
The optical film of the second invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region having a refractive index intermediate between the refractive indexes of both layers, and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from the conductive particles.
That is, the second invention is different from the first invention in that inorganic fine particles are essential constituent components instead of the binder having an aromatic group being an optional component.
The optical film of the third invention has, on a support, an antistatic layer containing conductive particles, and at least one adjacent layer adjacent to the antistatic layer, between the layers. There is a layer region formed by mixing the constituent component of the antistatic layer and the constituent component of the adjacent layer, and the layer region contains a binder having an aromatic group.
That is, the third invention is different from the first invention in that the layer region is made of a specific component instead of having a specific refractive index.
The optical film of the fourth invention has, on a support, an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and between the two layers. There is a layer region formed by mixing the component of the antistatic layer and the component of the adjacent layer, and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from the conductive particles. contains.
That is, in the fourth invention, the layer region is made of a specific constituent component instead of having a specific refractive index, and the inorganic fine particles are essential constituent components instead of the binder having an aromatic group being an optional component. However, it differs from the first invention.

4). (Method for producing optical film of the present invention)
Next, the manufacturing method of the optical film of this invention is demonstrated.
In the optical film of the present invention, the refractive index is 1.55 which is different from the binder and / or conductive particles having an aromatic group in the AS layer and the “layer region having an intermediate refractive index between the AS layer and the N layer”. As a method for containing the above inorganic fine particles, an AS layer forming coating composition containing inorganic fine particles having a refractive index of 1.55 or more different from the binder-forming compound and / or conductive particles having an aromatic group, A coating composition for forming an AS layer and a coating composition for forming an N layer are applied adjacent to each other, dried, and cured as necessary to form an optical film, and a binder-forming compound having an aromatic group and This can be achieved by diffusing inorganic fine particles having a refractive index of 1.55 or more different from conductive particles.

  In the present invention, an optical film having a layer region having an intermediate refractive index between the AS layer and the N layer is applied simultaneously with the AS layer forming coating composition and the N layer forming coating composition, It is preferable to produce using the method of apply | coating the coating composition for formation of the other layer, while the polymerization rate of the coating composition for formation of any one layer is low.

  More specifically, the method for producing an optical film of the present invention is a method for producing an optical film having, on a support, an antistatic layer and at least one adjacent layer adjacent thereto. When the layer contains a binder having an aromatic group and forms an antistatic layer and an adjacent layer, the reaction is performed so that the reaction rate of the polymerizable functional group of the previously applied layer is 0% or more and 50% or less. Can be implemented.

  Another method for producing the optical film of the present invention is a method for producing an optical film having, on a support, an antistatic layer and at least one adjacent layer adjacent thereto. Contains inorganic fine particles having a refractive index larger than 1.55, different from the conductive particles, and when forming the antistatic layer and the adjacent layer, the reaction rate of the polymerizable functional group of the layer applied earlier Can be carried out by curing so as to be 0% or more and 50% or less.

In short, the method for producing an optical film of the present invention includes the above-described coating composition for forming an AS layer and an N layer, in which a layer (first layer) previously coated contains an unreacted polymerizable compound. The second layer is applied as it is, and then the curing is further advanced, whereby the above-described layer region of the optical film of the present invention is formed.
The polymerization rate of the polymerizable compound of the first layer before coating the second layer is 0 to 50%, and most preferably 10 to 30%. By adjusting the polymerization rate within the above range, interfacial mixing can be controlled, and unevenness prevention and interfacial adhesion reinforcement can be achieved. The polymerization rate can be calculated using the method described in the Polymer Analysis Handbook (edited by the Japan Society for Analytical Chemistry, Polymer Analysis Roundtable). Specifically, for example, in the case of a polymerization reaction with a (meth) acryloyloxy group, the carbon-carbon double bond (C = C) of the (meth) acryloyloxy group of the binder in the coated hard coat layer infrared absorption peak area a and acyl groups vicinity of 810 cm ^-1 in the (C = O) was measured before and after the polymerization reaction an infrared absorption peak area B in the vicinity of 1720 cm ^-1 of the resulting, [(a / B after polymerization) / (A / B before polymerization)] × 100, the disappearance of the double bond is calculated, and this is defined as the polymerization rate (%).

  In the method for producing an optical film of the present invention, when forming a layer containing conductive particles and a layer adjacent thereto, the two layers are preferably coated without winding up the support.

  In the method for producing an optical film of the present invention, it is preferable to simultaneously apply a layer coating composition containing conductive particles and a layer coating composition adjacent thereto.

4-1. (Physical properties of coating solution (coating composition))
In carrying out the production method of the present invention, the upper limit speed that can be applied is greatly influenced by the physical properties of the coating liquid, and therefore it is preferable to control the physical properties of the coating liquid, particularly the viscosity and surface tension at the moment of application. The viscosity is preferably 0.5 to 10.0 [mPa · sec] or less, and more preferably 0.5 to 6.0 [mPa · sec]. Since there are some coating solutions whose viscosity changes depending on the shear rate, the above value indicates the viscosity at the shear rate at the moment of coating. When a thixotropic agent is added to the coating solution, the viscosity is low at the time of coating with high shear, and when the coating solution is hardly sheared, if the viscosity is high, unevenness during drying is less likely to occur, which is preferable.

  The surface tension of the coating solution is preferably in the range of 15 to 36 [mN / m]. It is preferable to reduce the surface tension by adding a leveling agent or the like because unevenness during drying is suppressed. On the other hand, if the surface tension is too low, the upper limit speed at which coating can be performed is reduced. Therefore, a range of 17 [mN / m] to 32 [mN / m] is more preferable, and 19 [mN / m] to 26 [mN / m]. mN / m] is more preferable.

4-2. (Application)
The coating method of the coating composition when forming each layer in the method for producing an optical film of the present invention is not particularly limited, but is a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar coating method, Known methods such as a gravure coating method, an extrusion coating method (die coating method) (see US Pat. No. 2,681,294) and a micro gravure coating method are used, and among them, a micro gravure coating method and a die coating method are preferable.

  In particular, when coating a coating composition for forming an AS layer and a coating composition for forming an N layer adjacent to each other, a method of coating two or more layers simultaneously with a single coating apparatus (Japanese Patent Laid-Open No. 2002-86050) , JP 2003-260400 A, JP 7-108213 A) and a method of applying two or more layers in one winding by arranging the coating / drying / curing apparatus in multiple stages (JP 2003-26015 A). -205264) is preferred.

4-3. (Curing)
4-3-1. (Curing conditions)
The optical film of the present invention is finally obtained by drying the solvent, passing the zone through which the coating film is cured by ionizing radiation and / or heat on the web, and curing the coating film.

  The ionizing radiation species in the present invention is not particularly limited, and is appropriately selected from ultraviolet rays, electron beams, near ultraviolet rays, visible light, near infrared rays, infrared rays, X-rays and the like according to the type of curable composition forming the film. Although it can be selected, ultraviolet rays and electron beams are preferred, and ultraviolet rays are particularly preferred because they are easy to handle and easily obtain high energy.

  Moreover, an electron beam can be used similarly. As an electron beam, 50 to 1000 keV, preferably 100 to 100, emitted from various electron beam accelerators such as a cockroft Walton type, a bandegraph type, a resonance transformation type, an insulated core transformer type, a linear type, a dynamitron type, and a high frequency type. An electron beam having an energy of 300 keV can be given.

Irradiation conditions vary depending on each lamp, but the irradiation light quantity is preferably 10 mJ / cm ² or more, more preferably 50 mJ / cm ^{2 to} 10000 mJ / cm ² , and particularly preferably 50 mJ / cm ^{2 to} 2000 mJ / cm ^2. It is.

  The time for irradiating with ionizing radiation is preferably from 0.7 seconds to 60 seconds, more preferably from 0.7 seconds to 10 seconds. If it is 0.5 seconds or less, the curing reaction cannot be completed, and sufficient curing cannot be performed. Also, maintaining low oxygen conditions for a long time is not preferable because the equipment becomes large and a large amount of inert gas is required.

  The oxygen concentration is preferably formed by a crosslinking reaction or a polymerization reaction of an ionizing radiation curable compound in an atmosphere of 6% by volume or less, more preferably 4% by volume or less, particularly preferably 2% by volume of oxygen. Hereinafter, it is most preferably 1% by volume or less. In order to reduce the oxygen concentration more than necessary, a large amount of inert gas such as nitrogen is required, which is not preferable from the viewpoint of production cost.

  As a method of reducing the oxygen concentration to 10% by volume or less, it is preferable to replace the atmosphere (nitrogen concentration of about 79% by volume, oxygen concentration of about 21% by volume) with another gas, particularly preferably replacement with nitrogen (nitrogen purge). It is to be.

  During curing, the film surface is preferably heated at 40 ° C. or higher and 170 ° C. or lower. Below 40 ° C, the effect of heating is small, and above 170 ° C, problems such as deformation of the substrate occur. A more preferable temperature is 60 ° C to 100 ° C. The film surface refers to the film surface temperature of the layer to be cured. The time for the film to reach the temperature is preferably 0.1 second or more and 300 seconds or less from the start of UV irradiation, and more preferably 10 seconds or less. If the time for maintaining the temperature of the film surface in the above temperature range is too short, the reaction of the curable composition that forms the film cannot be accelerated, and conversely, if it is too long, the optical performance of the film deteriorates and the equipment is large. Manufacturing problems such as

  There is no particular limitation on the heating method, but a method of heating a roll to contact the film, a method of spraying heated nitrogen, irradiation with far infrared rays or infrared rays is preferable. A method of heating a rotating metal roll described in Japanese Patent No. 2523574 by flowing a medium such as hot water, steam or oil can also be used. As a heating means, a dielectric heating roll or the like may be used.

In the present invention, at least one layer laminated on the support can be cured by multiple times of ionizing radiation. In this case, it is preferable that at least two ionizing radiations are performed in a continuous reaction chamber in which the oxygen concentration does not exceed 3% by volume. By performing multiple times of ionizing radiation irradiation in the same low oxygen concentration reaction chamber, the reaction time required for curing can be effectively ensured. In particular, when the production rate is increased for high productivity, ionizing radiation irradiation is required multiple times to ensure the energy of ionizing radiation necessary for the curing reaction. Thereby, the uniformity of the progress of curing in the coating film surface is maintained, and it is effective in reducing surface failure.

  The ultraviolet irradiation may be performed every time one layer is provided for each of a plurality of constituent layers, or may be performed after lamination. Or you may irradiate combining these. From the viewpoint of productivity, it is preferable to irradiate ultraviolet rays after laminating multiple layers.

4-3-2. Method of using polymerization initiators having different photosensitive wavelengths In the present invention, a method of controlling the reaction rate of polymerizable functional groups in a polymerizable compound contained in a coating composition for forming an AS layer or a coating composition for forming an N layer For example, a method using two or more kinds of polymerization initiators having different photosensitive wavelengths as shown below can be used. In the method for producing an optical film of the present invention, “a first coating layer formed by coating first comprising two or more kinds of polymerization initiators having different absorption terminals on the long wavelength side in the photosensitive wavelength region” , At least one of the polymerization initiators (a) is substantially unsensitized and at least one of the polymerization initiators (b) is irradiated and cured with ionizing radiation (step 1); On the first coating layer, a coating solution for forming a second coating layer containing at least one polymerization initiator (c) is coated, and the polymerization initiators (a) and (c) have a wavelength at which the polymerization initiators (c) are exposed. It is preferable to employ a “coating / manufacturing method in which ionizing radiation irradiation is performed (step 2) and the first layer and the second layer are cured”. That is, in the optical film of the present invention, the coating composition to be coated first in the production stage among the coating composition for forming the AS layer and the coating composition for forming the N layer has a long wavelength in the photosensitive wavelength region. It is preferable that two or more kinds of polymerization initiators having different absorption ends on the side are contained, and the coating composition to be subsequently coated contains at least one kind of polymerization initiator.

  Substantially non-photosensitive means the ratio of the double bond (A) reduced by ionizing radiation used in step 1 to the double bond (B) reduced by ionizing radiation used in steps 1 and 2 ( A / B) means 30% or less. This ratio is preferably 10% or less, and more preferably 3% or less. The double bond amount can be measured and calculated by the above infrared absorption peak area ratio.

When the second coating layer is cured, the initiator of the first coating layer is also exposed to light so that it is not easily affected by the inhibition of curing by oxygen, etc., and the layer can be sufficiently cured, increasing the hardness and scratching resistance. Improve.
As one of the actual preferred embodiments, for example, in Step 1, the N layer is used as the first coating layer, the coating composition for forming the N layer, the polymerization initiator (a) having a photosensitive region in the near ultraviolet ray, and mainly the ultraviolet ray. In combination with the polymerization initiator (b) having a photosensitive region, the first coating layer is irradiated with near-ultraviolet rays, and then, in step 2, a polymerization initiator having a photosensitive region in the near-ultraviolet region and only the ultraviolet-sensitive region. There is a method in which an AS layer is applied as a second coating layer containing a polymerization initiator (c), and irradiated with near ultraviolet rays and ultraviolet rays, and cured by these two steps. Here, the same polymerization initiator (c) as the polymerization initiator (b) can be used.
By adjusting the absolute amounts and ratios of the polymerization initiators (a) and (b) of the first coating layer, the polymerization rate of the first coating layer in step 1 and the polymerization rate after finishing up to step 2 are controlled. be able to. For example, in order to make the layer region have a thickness or the like that achieves the desired effect of the present invention, the polymerization initiator (b) is 100 to 300 parts by mass with respect to 100 parts by mass of the polymerization initiator (a). Is preferred.

  The polymerization initiator having a different photosensitive wavelength is preferably selected from the following. The polymerization initiator having a photosensitive wavelength in the near-ultraviolet region and a polymerization initiator having a different photosensitive wavelength region and usable in combination may be used as the polymerization initiator (a).

As a polymerization initiator having a photosensitive wavelength in the near ultraviolet region, 2,4,6-trimethylbenzoyldiphenylphosphine oxide {“DAROCUR TPO” (trade name); manufactured by Ciba Specialty Chemicals Co., Ltd.}, phenylenebis (2 , 4,6-trimethylbenzoyl) -phosphine oxide {"IRGACURE 819" (trade name); manufactured by Ciba Specialty Chemicals Co., Ltd.}; bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl- Phosphine oxides such as pentylphosphine oxide, thioxanthone such as 2,4-diethylthioxanthone, 2-chlorothioxanthone, 1-chloro-4-propoxythioxanthone, N-methylacridone, bis (dimethylaminophenyl) ketone, 2-benzyl -2-dimethyl Ketones such as Mino-1- (4-morpholinophenyl) -butan-1-one {"IRGACURE 369" (trade name); manufactured by Ciba Specialty Chemicals Co., Ltd.}, 1,2-octanedione-1- Compounds having an absorption terminal up to around 400 nm, such as oximes such as [4- (phenylthio) -2,2- (O-benzoyloxime)] are preferred. Phosphine oxides are particularly preferred because the produced film is less colored and the decolorization after irradiation is large.

  As a polymerization initiator that has a photosensitive wavelength region different from that of the above polymerization initiator and can be used in combination, an initiator mainly absorbing in the ultraviolet region is 2,2-dimethoxy-1,2-diphenylethane. -1-one {"IRGACURE 651" (trade name); manufactured by Ciba Specialty Chemicals Co., Ltd.}, 1-hydroxycyclohexyl-phenyl ketone {"IRGACURE 184" (trade name); Ciba Specialty Chemicals Co., Ltd. Made}, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one {“IRGACURE 907” (Product name); Acetophenones and benzoins such as Ciba Specialty Chemicals Co., Ltd.} Benzophenones, ketals, can be mentioned publicly known initiator such as anthraquinones.

  The amount of the polymerization initiator with respect to 100 parts by mass of the polymerizable compound having a polymerizable functional group is preferably 1 part by mass or more and 10 parts by mass or less. If the amount of the polymerization initiator is not less than the lower limit, the reaction can proceed sufficiently to obtain a desired hardness, and if it is not more than the upper limit, the resulting cured layer (hereinafter also referred to as a film). It is preferable to use in this range, since it is difficult to cause problems such as coloring or hardness changing in the depth direction.

  When a polymerization initiator having absorption in the near ultraviolet region and a polymerization initiator having absorption in the ultraviolet region are used in combination, the ratio of the amounts used (near ultraviolet: ultraviolet) should be within the range of the above addition amount. There is no particular limitation.

The ionizing radiation used in the curing step 1 can be appropriately selected according to the type of polymerization initiator and curable composition used. For example, in the case of irradiating light in the near ultraviolet region, a lamp that mainly emits light in the wavelength region of 400 to 480 nm {a lamp having an emission peak at 400 to 480 nm, such as 400 to 480 nm (preferably 420 nm ± 20 nm) ) The light emitted from a hot cathode fluorescent lamp provided with a phosphor so as to have a radiation peak} or the light of a metal halide lamp having a wide distribution of radiation wavelengths, etc., is transmitted on the short wavelength side (for example, 380 nm or less) with a short wavelength cut filter. Can be used. The irradiation of the near ultraviolet, preferably 30~1000mJ / cm ^2, more preferably 50~700mJ / cm ^2.

The ionizing radiation used in step 2 can be appropriately selected according to the type of polymerization initiator and curable composition used. There is no particular limitation as long as the polymerization initiators (a) and (c) have a wavelength to be sensitized, but irradiation with ultraviolet rays is preferable. Ultraviolet curing is preferred because the polymerization rate is fast, the equipment can be made compact, the types of compounds that can be selected are abundant, and the price is low. In the case of ultraviolet rays, ultra-high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arcs, xenon arcs, metal halide lamps and the like can be used. The irradiation dose of ultraviolet rays is preferably 30~1000mJ / cm ^2, more preferably 50~700mJ / cm ^2.

〔Polarizer〕
The polarizing plate of the present invention is a polarizing plate having a polarizing film and protective films provided on both sides of the polarizing film, and at least one of the protective films is the optical film of the present invention.
Moreover, it can also be set as the structure formed by sandwiching a polarizing film with the optical film of this invention, and another protective film other than that.
As another protective film, a normal cellulose acetate film may be used, but a cellulose acetate film manufactured by a solution casting method and stretched in the width direction in a roll film form at a stretching ratio of 10 to 100% is used. May be.
Furthermore, in the polarizing plate of the present invention, one surface may be the optical film of the present invention, while the other protective film may be an optical compensation film having an optically anisotropic layer made of a liquid crystalline compound.
In addition, in the polarizing plate of the present invention, one side is the optical film of the present invention, while the other protective film is a film having Re of 0 to 10 nm and Rth of -20 to 20 nm (for example, JP 2005-301227 A). No. paragraph number [0095]).

  Examples of the polarizing film include an iodine polarizing film, a dye polarizing film using a dichroic dye, and a polyene polarizing film. The iodine polarizing film and the dye polarizing film are generally produced using a polyvinyl alcohol film.

The other protective film is preferably an optical compensation film having an optical compensation layer comprising an optical anisotropic layer. The optical compensation film (retardation film) can improve the viewing angle characteristics of the liquid crystal display screen.
A known film can be used as the optical compensation film, but the optical compensation film described in JP-A-2001-100042 is preferable in terms of widening the viewing angle.

  In the polarizing plate of the present invention, the optical film of the present invention is preferably disposed on the viewing side opposite to the liquid crystal cell when used with a liquid crystal display device or the like.

(Image display device)
The image display device of the present invention has the optical film of the present invention or the polarizing plate of the present invention.
That is, the optical film and polarizing plate of the present invention can be advantageously used in an image display device such as a liquid crystal display device, and is preferably used as the outermost layer of the display.
An image display device usually has a liquid crystal cell and two polarizing plates arranged on both sides thereof, and the liquid crystal cell carries a liquid crystal between two electrode substrates. Furthermore, one optically anisotropic layer may be disposed between the liquid crystal cell and one polarizing plate, or two optically anisotropic layers may be disposed between the liquid crystal cell and both polarizing plates. Here, it is preferable that the polarizing plate of this invention is installed only in the visual recognition side.

  The liquid crystal cell is preferably in TN mode, VA mode, OCB mode, IPS mode or ECB mode.

<TN mode>
In the TN mode liquid crystal cell, rod-like liquid crystal molecules are substantially horizontally aligned when no voltage is applied, and are twisted and aligned at 60 to 120 °.
The TN mode liquid crystal cell is most frequently used as a color TFT liquid crystal display device, and is described in many documents.

<VA mode>
In a VA mode liquid crystal cell, rod-like liquid crystal molecules are aligned substantially vertically when no voltage is applied.
The VA mode liquid crystal cell includes (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied, and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. Hei 2-). 176625) (2) Liquid crystal cell (SID97, Digest of Tech. Papers (Proceedings) 28 (1997) 845 in which the VA mode is converted into a multi-domain (for MVA mode) in order to enlarge the viewing angle. ), (3) A liquid crystal cell in a mode (n-ASM mode) in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is applied when a voltage is applied (Preliminary collections 58-59 of the Japan Liquid Crystal Society) (1998)) and (4) SURVAVAL mode liquid crystal cells (announced at LCD International 98).

<OCB mode>
The OCB mode liquid crystal cell is a bend alignment mode liquid crystal cell in which rod-like liquid crystal molecules are aligned in substantially opposite directions (symmetrically) at the upper and lower portions of the liquid crystal cell. US Pat. No. 4,583,825, No. 5,410,422. Since the rod-like liquid crystal molecules are symmetrically aligned at the upper and lower portions of the liquid crystal cell, the bend alignment mode liquid crystal cell has a self-optical compensation function. Therefore, this liquid crystal mode is called an OCB (Optically Compensatory Bend) liquid crystal mode. The bend alignment mode liquid crystal display device has an advantage of high response speed.

<IPS mode>
The IPS mode liquid crystal cell is a type in which a nematic liquid crystal is switched by applying a lateral electric field. IDRC (Asia Display '95), p. 577-580 and p. 707-710.

<ECB mode>
In the ECB mode liquid crystal cell, rod-like liquid crystalline molecules are substantially horizontally aligned when no voltage is applied. The ECB mode is one of the liquid crystal display modes having the simplest structure, and is described in detail in, for example, Japanese Patent Application Laid-Open No. 5-203946.

<Touch panel>
The optical film of the present invention can be applied to touch panels described in JP-A-5-127822 and JP-A-2002-48913.

<Organic EL device>
The optical film of the present invention can be used as a substrate (base film) such as an organic EL element or a protective film.
When the optical film of the present invention is used for an organic EL device or the like, JP-A-11-335661, JP-A-11-335368, JP-A-2001-192651, JP-A-2001-192652, JP-A-2001-192653. JP, 2001-335776, JP, 2001-247859, JP, 2001-181616, JP, 2001-181617, JP, 2002-181816, JP, 2002-181617, JP, 2002-056776, etc. The contents described in each publication can be applied. Moreover, it is preferable to use together with the content of each gazette of Unexamined-Japanese-Patent No. 2001-148291, Unexamined-Japanese-Patent No. 2001-221916, and Unexamined-Japanese-Patent No. 2001-231443.

  In order to describe the present invention in detail, examples will be described below, but the present invention is not limited thereto. Unless otherwise specified, “part” and “%” are based on mass.

Example of production of optical film (Example 1)
N layer coating liquids (NL-1) to (NL-3) and AS layer coating liquids (ASL-1) to (ASL-9) shown in the following table were prepared.

[Preparation of coating solution for N layer]

───────────────────────────────────
Composition of N layer coating solution (NL-1) --------------------------
PET-30 47.0g
DPHA 50.0g
Irgacure 184 2.0g
Irgacure 369 1.0g
SP-13 0.01g
Propylene glycol monoethyl ether 70.0g
Butanol 10.0g
MEK 20.0g
───────────────────────────────────

───────────────────────────────────
Composition of N layer coating solution (NL-2) --------------------------
PET-30 17.0g
DPHA 50.0g
M-215 30.0g
Irgacure 184 2.0g
Irgacure 369 1.0g
SP-13 0.01g
49.0 g of propylene glycol monoethyl ether
Butanol 7.0g
MEK 14.0g
───────────────────────────────────

───────────────────────────────────
Composition of N layer coating solution (NL-3) --------------------------
DPHA 50.0g
M-215 47.0g
Irgacure 184 2.0g
Irgacure 369 1.0g
SP-13 0.01g
Propylene glycol monoethyl ether 20.0g
MEK 10.0g
───────────────────────────────────

The coating liquid was filtered through a polypropylene filter having a pore size of 30 μm to prepare N-layer coating liquids (NL-1) to (NL-3).
The compounds used are shown below.
DPHA: Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate [manufactured by Nippon Kayaku Co., Ltd.]
PET-30: A mixture of pentaerythritol triacrylate and pentaerythritol tetraacrylate [manufactured by Nippon Kayaku Co., Ltd.]
M-215: Isocyanuric acid ethoxy modified diacrylate [manufactured by Toagosei Co., Ltd., Aronix M-215]
・ Irgacure 184: Polymerization initiator [Ciba Specialty Chemicals Co., Ltd.]
・ Irgacure 369: Polymerization initiator [Ciba Specialty Chemicals Co., Ltd.]
・ SP-13 Fluorine surface modifier

SP-13 Fluorine surface modifier

  Further, the refractive index when the above NL-1 to NL-3 were dried and cured was 1.51.

[Preparation of coating solution for AS layer]
Preparation of coating solution for antistatic layer (ASL-1) Commercially available conductive fine particles ATO “antimony-doped tin oxide T-1” {specific surface area 80 m ² / g, manufactured by Mitsubishi Materials Corporation} 30.0 parts 4.0 parts of the following dispersant (B-1) having a functional group and a methacryloyl group and 67 parts of propylene glycol monoethyl ether were added and stirred.

Dispersant (B-1)

  The ATO particles in the liquid were dispersed using a media disperser (using zirconia beads having a diameter of 0.1 mm). It was 50 nm as a result of evaluating the mass mean particle diameter of the ATO particle | grains in a dispersion liquid by the light-scattering method. In this way, an ATO dispersion was prepared.

To 100 parts of the above ATO dispersion, 15 parts of a mixture of DPTA and dipentaerythritol hexaacrylate “DPHA” {manufactured by Nippon Kayaku Co., Ltd.}, photopolymerization initiator “Irgacure 184” {Ciba Specialty Chemicals Co., Ltd.} 0.7 part, photopolymerization initiator “Irgacure 369” {Ciba Specialty Chemicals Co., Ltd.} 0.3 part, fluorine-based surface modifier “SP-13” 0.03 part, And 19 parts of MEK was added and stirred. In this way, an antistatic layer coating solution (ASL-1) was prepared.
The composition of ASL-1 is shown below.

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-1) -------------------------
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 15.0g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-2) -------------------------
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
DPSM 7.0g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-3) -------------------------
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
ZrO ₂ (average particle size 12 nm) 7.0 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-4) -------------------------
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
ZrO ₂ (average particle size 7 nm) 7.0 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-5) ───────────────────────────────────
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
ZrO ₂ (average particle size 20 nm) 7.0 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-6) ───────────────────────────────────
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
DPSM 3.5g
PTM 3.5g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of AS layer coating solution (ASL-7) ───────────────────────────────────
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
DPSM 3.5g
ZrO ₂ (average particle size 12 nm) 3.5 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 19.0g
───────────────────────────────────

───────────────────────────────────
Composition of AS layer coating solution (ASL-8) ───────────────────────────────────
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
ZrO ₂ (average particle size 12 nm) 7.0 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 5.0g
───────────────────────────────────

───────────────────────────────────
Composition of coating liquid for AS layer (ASL-9) ───────────────────────────────────
ATO (T-1) 30.0g
Dispersant (B-1) 4.0 g
DPHA 8.0g
DPSM 3.5g
ZrO ₂ (average particle size 12 nm) 3.5 g
Irgacure 184 0.7g
Irgacure 369 0.3g
SP-13 0.03g
Propylene glycol monoethyl ether 67.0g
MEK 4.0g
───────────────────────────────────

The compounds used are shown below.
DPSM: bis (4-methacryloxyethoxyphenyl) sulfide PTM: phenylthioethyl methacrylate ZrO ₂ (average 12 nm): (MEK dispersion of ZrO ₂ Al coupling agent plain act AL for Sumitomo Osaka Cement -M (manufactured by Ajinomoto Co., Inc.) 3 mass% (vs. ZrO ₂ ) added, refractive index of ZrO ₂ particles 2.2)
ZrO ₂ (average 8 nm): (difference in ZrO ₂ particle size)
ZrO ₂ (average 20 nm): (difference in ZrO ₂ particle size)

  The refractive index when the AS layer coating solution was dried and cured was 1.62 for ASL-1 and 1.63 for ASL-2 to ASL-9.

(Preparation of optical film (101))
Film processed into a roll with a width of 180 mm using an apparatus capable of continuous base unwinding / first coater / first drying / first UV irradiation / second coater / second drying / second UV irradiation / winding. An optical film was formed on a triacetylcellulose film “TAC-TD80U” {manufactured by FUJIFILM Corporation} having a thickness of 80 μm and a coating width of 150 mm under the following conditions.

Application speed: 10 m / min
First coater: 1 slot extrusion coater First layer coating solution: NL-1
First drying: 80 ° C. for 90 seconds First UV irradiation: 40 mJ / cm ² , nitrogen purge, oxygen concentration 0.1% or less Second coater: 1 slot extrusion coater Second layer coating solution: ASL-1
Second drying: 80 ° C. for 90 seconds Second UV irradiation: 120 mJ / cm ² , purged with nitrogen and oxygen concentration of 0.1% or less

The flow rate of the first layer coating solution is adjusted so that the film thickness after drying and curing is 3.0 μm, and the flow rate of the second layer coating solution is adjusted so that the film thickness after drying and curing is 1.0 μm. Produced.
In the production of the optical film 101, samples 102 to 124 were produced in which the coating liquid type, the dry cured film thickness, and the UV irradiation amount were changed as shown in Table 1.

(Evaluation of optical film)
The following evaluation was performed with respect to the obtained optical films 101-124.

(Evaluation 1) Polymerization rate of 1st application layer The polymerization rate of the 1st application layer was measured by the method as described in the text using the 1st application layer after drying and hardening before applying the 2nd application layer.

(Evaluation 2) Observation of interface between N layer and AS layer A 50 nm thick section of each sample was prepared and photographed with a transmission electron microscope at a magnification of 150,000, and the state at the interface of conductive particles and inorganic fine particles was observed. Observed. In addition, each sample was obliquely cut at an angle of 5 ° with respect to the horizontal plane of the support, the cutting interface was observed with TOF-SIMS, the signal distribution specific to the binder having an aromatic group was observed, and The mixed state of was observed. The evaluation of the interface was classified into the following six.
Clear: The interface is clear, and diffusion of binders containing an aromatic group or particles having a refractive index ≧ 1.55 different from the conductive particles and conductive particles is hardly observed.
Slow change: Near the interface, particles having a refractive index ≧ 1.55 different from the conductive particles and / or a layer in which the concentration of the aromatic group-containing binder is different from the N layer or AS layer is observed. (Aspect 1 of the present invention)
-Random mixing: Layers with different concentrations of conductive particles are observed near the interface, and the layer thickness is not constant and is disturbed.
Interfacial mixed layer: In the vicinity of the interface, a layer that is neither an AS layer nor an N layer and in which the composition of another composition does not change in the film thickness direction is formed. (Aspect 2 of the present invention)
-Sea-island structure: A phase containing particles having a refractive index ≧ 1.55 different from the conductive particles and an aromatic group-containing binder exists in the vicinity of the interface in a dispersed state, and has a sea-island structure. (Aspect 3 of the present invention)
-Not observed: The interface is not observed.
For gradual change, interfacial mixed layer, and random mixing, the thickness of the layer having a refractive index ≧ 1.55 different from the conductive particles and the layer containing the aromatic group-containing binder is changing. It was. When the interfacial mixed layer was formed, the thickness of the layer was estimated. For the sea-island structure, the diameter of the dispersed phase was estimated.

(Evaluation 3) Surface Resistance The surface resistance value was measured by the circular electrode method described in the text.

(Evaluation 4) Interference unevenness The following undulation amplitude was used as an index of interference unevenness. In order to eliminate the influence of reflection on the back surface of the measurement sample, the surface (back surface) opposite to the measurement surface (the surface on which the AS layer is provided) is roughened with sandpaper, and then the average of visible light with a wavelength of 400 to 600 nm is used. It was colored with black magic ink so that the transmittance was 5% or less. The spectrophotometer “V-550” (manufactured by JASCO Corporation) is equipped with an adapter “ARV-474”, and in the wavelength region of 380 to 780 nm, the specular reflectivity with an output angle of −5 ° at an incident angle of 5 ° Was measured. Obtain the “(mountain line-valley line)” at 550 nm for the line connecting the peaks of the undulations (peak line) and the line connecting the valleys of the undulation (valley line) in the reflectance spectrum at 400 nm to 650 nm. Waviness amplitude was calculated.
When the interference wavelength shifts due to the unevenness of the film thickness of the layer coated on the optical film, the reflectance of a specific wavelength greatly changes in a sample having a large undulation amplitude, and in particular, the unevenness occurs under a fluorescent light source where the light source has a bright line. Easy to stand out. The undulation amplitude is preferably 1.5% or less, and more preferably 1.0% or less.

(Evaluation 5) Steel wool scratch resistance evaluation (SW scratch resistance)
A rubbing test was conducted using a rubbing tester under the following conditions.
Evaluation environmental conditions: 25 ° C., 60% RH
Rub material: Steel wool (No. 0000, manufactured by Nippon Steel Wool Co., Ltd.) was wound around the rubbing tip (1 cm × 1 cm) of a tester in contact with the sample, and the band was fixed so as not to move. Then, the reciprocating rubbing motion under the following conditions was given.
Moving distance (one way): 13 cm, rubbing speed: 13 cm / second,
Load: 500 g / cm ³ , tip contact area: 1 cm × 1 cm,
Number of rubs: 10 round trips.
An oil-based black ink was applied to the back side of the rubbed sample and visually observed with reflected light, and scratches on the rubbed portion were evaluated according to the following criteria.
○: Even when viewed very carefully, no scratches are visible.
○ △: Slightly weak scratches are visible when viewed very carefully.
Δ: A weak scratch is visible.
Δ ×: moderate scratches are visible.
X: There are scratches that can be seen at first glance.

(Evaluation 6) Cross-cut adhesion evaluation (cross-cut adhesion)
A cross-cut test based on JIS K-5400 was performed using a sample stored at 25 ° C. and 60% RH for 24 hours or more. More specifically, 11 cuts are made vertically and horizontally on the surface on which the AS layer of each sample is coated, and 100 1 mm square grids are made, and a cellophane adhesive tape is pasted thereon. The action of attaching and quickly peeling off at 90 ° was repeated 5 times. The number of grids remaining without peeling was counted. Those having this number of 80 or more are practical.
The evaluation results are shown in Table 1.

In Table 1, when the refractive index of the layer region between the first layer and the second layer is estimated from the analysis by TOF-SIMS and the simulation of optical interference, the layer region formed is approximately 1.55 to 1. Around 57.
From the results shown in Table 1, the following is clear.
The AS layer contains a binder having an aromatic group and substantially non-conductive particles with a refractive index of ≧ 1.55, and the N layer of the first layer has a polymerization rate of 50% or less. This component diffuses to the N layer side and has an intermediate refractive index region, so that there is little decrease in surface resistance, and interference unevenness, cross-cut adhesion, and SW scratch resistance can be improved (Samples 101, 104- 106, 107 and samples 102, 103).
Further, when two types of binders having an aromatic group were used in combination, or when a binder having an aromatic group and particles having a refractive index of 1.55 or more were used in combination, the interference unevenness was reduced (compare samples 102, 109 and 110). . In addition, when the second layer is applied without curing the first layer, a high molecular weight compound is used for the binder of the NL layer of the first layer, so that an increase in surface resistance is reduced and interference unevenness is improved. It became possible (comparison of samples 112, 113 and 114, 115).
In addition, a sample that does not contain a binder having an aromatic group or an inorganic fine particle having a refractive index of ≧ 1.55 in the AS layer has a large interfacial mixing when the N layer and the AS layer are overcoated in an uncured state. When the film thickness is small, the interference unevenness is reduced to some extent, but the surface resistance is greatly reduced (samples 111, 118, 122). In comparison, the sample of the present invention, which contains a binder having an aromatic group in the AS layer and inorganic fine particles having a refractive index of ≧ 1.55 and diffused in the N layer, has a large effect of improving interference unevenness and reduces surface resistance. (Samples 112 to 115, 119, and 123).

(Example 2)
(Preparation of optical film (201))
A triacetyl cellulose film “TAC-TD80U” {manufactured by FUJIFILM Corporation} with a film thickness of 80 μm is unrolled in a roll form, and an N-layer coating solution (NL- 2) 31a and AS layer coating solution (ASL-8) were applied from 31b, applied at a transfer speed of 15 m / min, dried at 80 ° C. for 90 seconds, and then air-cooled metal halide lamp (under nitrogen purge) Using an iGraphics Co., Ltd., the coating layer was cured by being irradiated with ultraviolet rays having an irradiation amount of 240 mJ / cm ² and wound up. The coating amount was adjusted so that the thicknesses of the N layer and AS layer after curing were 3.0 μm and 1.0 μm, respectively.

The slot die shown in FIG. 4 has an upstream lip land length L _U of 0.5 mm, a midstream lip land length L _M of 0.5 mm, and a downstream lip land length L _D of 50 μm. The length in the web running direction was 150 μm.
The gap between the upstream and middle lip lands and the web W is 50 μm longer than the gap between the downstream lip land and the web W (hereinafter referred to as an overbite length of 50 μm), and the gap between the downstream lip land and the web W GL was set to 50 μm.

  In the production of the optical film 201, samples 202 to 204 were produced in which the coating liquid types were changed as shown in Table 2. The results of the same evaluation as in Example 1 are shown together in Table 2.

In Table 2, when the refractive index of the layer region between the first layer and the second layer is estimated from the analysis by TOF-SIMS and the simulation of optical interference, the layer region formed is approximately 1.55-1. Around 57.
According to Table 2, the AS layer contains a binder having an aromatic group or a substantially non-conductive particle having a refractive index of 1.55 or more. It can be seen that it diffuses to the layer side, has an intermediate refractive index region, has little decrease in surface resistance, and can improve interference unevenness, cross-cut adhesion, and SW scratch resistance. Further, it was found that when an AS layer containing both a binder having an aromatic group and particles having a refractive index of 1.55 or more is adjacent to the N layer and coated simultaneously, the intermediate refractive index region has a sea-island structure.

(Example 3)
The following coating solutions for low refractive index layer (LnL-1) to (LnL-4) were prepared.

(Preparation of coating solution for low refractive index layer (LnL-1))
Heat-crosslinkable fluorine-containing polymer (fluorine-containing silicone thermosetting polymer described in Example 1 of JP-A-11-189621) 4.52 g, curing agent (Cymel 303; trade name, manufactured by Nippon Cytec Industries Co., Ltd.) 13 g, curing catalyst (Catalyst 4050; trade name, manufactured by Nippon Cytec Industries Co., Ltd.) 0.11 g, colloidal silica dispersion (MEK-ST-L; trade name, Nissan Chemical Co., Ltd., solid content concentration 30%, 1.5 g of an average particle size of about 50 nm, 15.0 g of silica dispersion B (cyclohexanone dispersion of hollow silica, 15% polymerizable functional group-containing surface treatment agent relative to silica, 23% solid content), sol solution a2.5 g, photopolymerization initiator (PM980M, molecular weight 527, manufactured by Wako Pure Chemical Industries) 0.60 g, and methyl ethyl ketone 114 g Pressurizing, after stirring, the mixture was filtered through a polypropylene filter having a pore size of 1 [mu] m, to prepare a coating solution for low refractive index layer (LnL-1). The refractive index of the film obtained by curing the coating solution for the low refractive index layer was 1.36.

(Preparation of coating solution for low refractive index layer (LnL-2))
2.65 g of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, manufactured by Nippon Kayaku Co., Ltd.), silica dispersion B (hollow silica dispersion, surface treatment agent containing a polymerizable functional group with respect to silica) 15% used, solid content concentration 23%) 30.0 g, sol liquid 2.93 g, reactive silicone X-22-164C (trade name; manufactured by Shin-Etsu Chemical Co., Ltd.) 0.15 g, fluorine-containing compound F3035 (trade name; Nippon Oil & Fat Co., Ltd., solid content concentration 30%) 0.15 g, photopolymerization initiator (Irgacure 369 (trade name), Ciba Specialty Chemicals Co., Ltd., molecular weight 367) 0.20 g and methyl ethyl ketone 103 g, cyclohexanone 3 .5g was added, stirred, and filtered through a polypropylene filter with a pore size of 1μm. Rate layer coating solution (LnL-2) was prepared. The refractive index of the film obtained by curing the coating solution for the low refractive index layer was 1.42.

(Preparation of coating solution for low refractive index layer (LnL-3))
5.22 g of radically polymerizable fluorine-containing polymer (fluorinated silicone-containing radically polymerizable polymer P9 described in JP-A-2003-222702), a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (DPHA, Nippon Kayaku) 0.50 g, silica dispersion B (hollow silica dispersion, solid content concentration 23%) 15.0 g, sol liquid a 4.4 g, reactive silicone RMS-033 (trade name; manufactured by Gelest) 0 .15 g, 0.17 g of photopolymerization initiator Irgacure 369 (manufactured by Ciba Specialty Chemicals Co., Ltd., molecular weight 367), 114 g of methyl ethyl ketone, and 3.5 g of cyclohexanone were added, stirred, and filtered through a polypropylene filter having a pore size of 1 μm. The coating liquid for the low refractive index layer (LnL 3) was prepared. The refractive index of the film obtained by curing the coating solution for the low refractive index layer was 1.36.

(Preparation of coating solution for low refractive index layer (LnL-4))
Colcoat N103 (organoorganosiloxane oligomer (average molecular weight 950, manufactured by Colcoat) (2%) 245 parts by mass, OPSTAR JTA105 (fluorinated organosiloxane oligomer (5%), polyethylene glycol, hexamethylolmelamine, acid generator contained, 100 parts by mass of JSR), 1 part by mass of OPSTA-JTA105A (curing agent (5%), made by JSR), 23 parts by mass of hollow silica dispersion A (30%), 365 parts by mass of butyl acetate, and low A coating liquid for refractive index layer (LnL-4) was prepared, and the refractive index of the film obtained by curing the coating liquid for low refractive index layer was 1.36.

The dispersion used is shown below.
Hollow silica dispersion A: Hollow silica fine particle sol, average particle diameter 65 nm, shell thickness 8 nm, refractive index of silica particles 1.28, prepared by changing the size according to Preparation Example 4 of JP-A-2002-79616, IPA dispersion The solid content was 30%.
Hollow silica dispersion B: The silica in the hollow silica dispersion A is surface-modified with 15 parts by mass of 3-acryloyloxypropyltrimethoxysilane as a surface treatment agent, and after modification, the solvent is substituted with cyclohexanone to obtain a solid content concentration of 23. %.

  Subsequently, the low refractive index layer was coated on the samples 101 to 103 and 114 to 115 of Example 1 and the samples 201 to 204 of Example 2 to prepare samples having the configurations shown in Table 3. The low refractive index layer was cured under the following conditions.

(Curing conditions for optical film using LnL-1 and LnL-4)
After drying at 90 ° C. for 150 seconds, thermosetting was performed at 110 ° C. for 10 minutes. Thereafter, while applying a nitrogen purge (oxygen concentration of 0.05% or less), ultraviolet rays having an irradiation energy amount of 240 mJ / cm ² were irradiated to cure the coating layer.

(Curing conditions for optical films using LnL-2 and LnL-3)
After drying at 90 ° C. for 150 seconds, the coating layer was cured by irradiating with an ultraviolet ray having an irradiation energy amount of 240 mJ / cm ² while purging with nitrogen (oxygen concentration 0.05% or less).

In addition to the evaluation according to Example 1, the obtained sample evaluated the specular reflectance shown below.
(Evaluation 7) Specular Reflectance Using a sample whose back surface was processed to eliminate the influence of back surface reflection in the same manner as the interference unevenness evaluation, an adapter “ARV-” was attached to a spectrophotometer “V-550” [manufactured by JASCO Corporation]. 474 ″ was mounted, and the specular reflectance at an output angle of −5 ° at an incident angle of 5 ° was measured in a wavelength region of 380 to 780 nm. The average reflectance in this wavelength region was taken as the specular reflectance of the present invention.
The evaluation results are shown in Table 3.

  From the results shown in Table 3, it can be seen that according to the present invention, it is possible to obtain a sample having excellent conductivity, suppressing occurrence of interference unevenness, and low reflectance.

Example 4
One surface of a cyclic olefin-based resin film (manufactured by Nippon Zeon Co., Ltd., trade name: ZEONOR, thickness 40 μ) was subjected to corona treatment, and a sample having a layer configuration of Example 3 was prepared. As a result of evaluation according to Example 3, according to the present invention, a sample having excellent conductivity and suppressing occurrence of interference unevenness was obtained.

(Example 5)
[Saponification of optical film]
The back surface of the sample of Example 3 was saponified under the following conditions.
Alkaline bath: 1.5 mol / dm ³ sodium hydroxide aqueous solution, 55 ° C.-120 seconds.
First washing bath: tap water, 60 seconds.
Neutralization bath: 0.05 mol / dm ³ sulfuric acid, 30 ° C.-20 seconds.
Second washing bath: tap water, 60 seconds.
Drying: 120 ° C, 60 seconds

[Production of polarizing plate with optical film]
A polarizing film was prepared by adsorbing iodine to a stretched polyvinyl alcohol film. A saponified antireflection film of Example 3 was attached to one side of the polarizing film using a polyvinyl alcohol-based adhesive so that the support (triacetylcellulose) side of the antireflection film was the polarizing film side. . A viewing angle widening film “Wide View Film SA12B” (manufactured by Fuji Film Co., Ltd.) having an optical compensation layer was saponified and attached to the other side of the polarizing film using a polyvinyl alcohol-based adhesive. In this way, a polarizing plate was produced.
As a result of evaluating the TN mode transmissive liquid crystal display device equipped with the produced polarizing plate of the present invention, it was confirmed that a display device excellent in visibility, dust resistance and scratch resistance could be produced.

(Example 6)
When the optical film of Example 3 was bonded to the glass plate on the surface of the organic EL display device via an adhesive, the interference unevenness was small, the conductivity was excellent, and the reflection on the glass surface was suppressed. A high display device was obtained.

FIG. 1 is a schematic diagram showing an antistatic layer and an adjacent layer, which are the main parts of an optical film as one embodiment of the present invention. FIG. 2 is a schematic view showing the structure of the layer region in one embodiment of the optical film of the present invention, and shows a sea-island structure. FIG. 3 is a schematic view showing the structure of the layer region in one embodiment of the optical film of the present invention, and shows a co-continuous structure. 1 is a cross-sectional view of a coater desirable for the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical film 2 Antistatic layer 3 Layer area | region 4 Adjacent layer W Web 31a Upstream lip land 31b Downstream lip land 33 Slot L _U Land length of upstream lip land L _M Land length of midstream lip land L _D Land length of downstream lip land

Claims (13)

  On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the intermediate refractive index of both layers is between the two layers. An optical film comprising a layer region having a refractive index, wherein the layer region contains a binder having an aromatic group.   On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the intermediate refractive index of both layers is between the two layers. An optical film in which a layer region having a refractive index exists, and the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from conductive particles.   On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the constituent components of the antistatic layer between the two layers, An optical film comprising a layer region formed by mixing the constituent components of the adjacent layer, wherein the layer region contains a binder having an aromatic group.   On the support, it has an antistatic layer containing conductive particles and at least one adjacent layer adjacent to the antistatic layer, and the constituent components of the antistatic layer between the two layers, An optical film comprising a layer region formed by mixing the constituent components of the adjacent layer, wherein the layer region contains inorganic fine particles having a refractive index of 1.55 or more different from conductive particles.   The layer region is formed by gradually changing the composition of a polymerizable compound and / or inorganic fine particles forming both layers at the interface between the antistatic layer and the adjacent layer. The optical film in any one.   5. The optical film according to claim 1, wherein the layer region is formed by forming the antistatic layer and the adjacent layer by forming another interface mixed layer at the interface between them.   5. The layer region according to any one of claims 1 to 4, wherein the antistatic layer and the adjacent layer are formed such that components of both layers form a sea-island structure or a co-continuous phase at the interface between them. The optical film as described.   The optical film according to any one of claims 1, 3, and 5 to 7, wherein the binder having an aromatic group is formed from a sulfur-containing aromatic compound having at least one polymerizable functional group.   The optical film according to claim 1, wherein the optical film further has a low refractive index layer.   The polarizing plate which has a polarizing film and the protective film provided in the both sides of this polarizing film, Comprising: At least one of this protective film is a polarizing plate which is an optical film in any one of Claims 1-9.   The image display apparatus which has the optical film of Claims 1-9, or the polarizing plate of Claim 10.   A method for producing an optical film having an antistatic layer and at least one adjacent layer adjacent thereto on a support, wherein the antistatic layer contains a binder having an aromatic group, and the antistatic layer And an adjacent layer, a method for producing an optical film is cured so that the reaction rate of the polymerizable functional group of the previously applied layer is 0% or more and 50% or less.   A method for producing an optical film having an antistatic layer and at least one adjacent layer adjacent thereto on a support, wherein the antistatic layer has a refractive index of 1.55 different from that of conductive particles. An optical film that contains larger inorganic fine particles and is cured so that the reaction rate of the polymerizable functional group of the previously applied layer is 0% or more and 50% or less when forming the antistatic layer and the adjacent layer. Manufacturing method.