TWI490124B - Optical layered product, polarizer and display using the optical layered product - Google Patents

Description

Optical laminate, polarizing plate, and display device using the same

The present invention relates to an optical laminate, a polarizing plate, and a display device using the same.

In the case of an image display device such as a liquid crystal display device (LCD), a Braun tube (CRT) display, a projection display, a plasma display (PDP), or an electroluminescence display, on the surface of the display device, Indoor illumination such as light, reflection of sunlight from a window, shadow of an operator, etc., hinder visibility of an image. In addition, it is also required to impart scratch resistance to the image display surface to prevent scratching during handling. For this reason, in order to improve the visibility of the image, the surface of these displays is provided with an optical functional layer such as an antiglare layer or an anti-glare layer having a fine uneven structure formed on the surface. In the optical laminate, the fine uneven structure can diffuse the surface reflected light, suppress the regular reflection of the external light, and prevent the external environment from being reflected (having anti-glare property).

In the case of these optical laminates, the following optical laminates are usually manufactured and sold, that is, polyethylene terephthalate (hereinafter referred to as "PET") or cellulose triacetate (hereinafter referred to as An optical layered body in which an antiglare layer having a fine uneven structure is formed on a light-transmitting substrate such as "TAC") and an optical layered body in which a low refractive index layer is laminated on the light-diffusing layer is being developed. A combination of constructions to provide an optical laminate of the desired function.

The optically functional layer has the desired properties. For example, the optical functional layer has a hard coat optical laminate and can be used as a hard coat film having a hard coat layer. Further, an optical layered body having a fine uneven structure formed on the surface of the optical functional layer can be used not only as a hard coat film but also as an antiglare film having an antiglare layer. Further, as the optical functional layer, a light diffusion layer or a low refractive index layer may be used. The development of an optical layered body having a desired function is progressing by using an optical functional layer such as a hard coat layer or an antiglare layer in a single layer form or a combination of layers.

Regarding the outermost surface (observation surface side) of the display, there are problems such as dust adhesion due to static electricity and poor liquid crystal display operation, and an optical laminate having an antistatic function has been demanded. In particular, with the increase in the contrast of the display, the adhesion of dust is likely to become conspicuous, and an optical laminate having an antistatic function is always required.

In addition, for the most surface (viewing side) of the display, severe operation (load caused by physical, mechanical, chemical stimuli, etc.) can be expected. For example, it is expected to use a glass cleaner (surfactant system, A rag of various cleaning agents such as an organic solvent wipes dust, fingerprints, and the like adhering to the surface of the display. Therefore, it has been demanded to improve the antifouling property on the surface of a hard coat film mounted on a display.

As an antistatic antiglare film having an antistatic function, a film in which a transparent conductive layer and an antiglare layer are sequentially laminated on a transparent substrate film has been proposed (for example, see Patent Document 1).

Further, by applying a resin layer, an antistatic antiglare film having a one-layer structure containing a quaternary ammonium salt compound for imparting antistatic properties and containing light-transmitting fine particles for imparting anti-glare properties can be obtained. (for example, Patent Documents 2 and 3).

Further, as a conductive material, an optical layered body using an organic conductive material such as polyaniline or polythiophene has been proposed. Since the organic conductive material is inferior in light resistance to the inorganic material and cannot maintain the antistatic property, it has been required to be improved. Here, in order to improve light resistance, a method of mixing a resin having a high glass transition point has been proposed (for example, Patent Document 4).

Further, an antistatic hard coat film in which a hard coat layer is directly provided on a substrate containing a cellulose triacetate film containing a metal oxide such as antimony trioxide having a particle diameter of 100 nm or less is disclosed. A compound having three or more acryloyl groups in the molecule and an acrylic compound containing a fluorine atom in the molecule (for example, see Patent Document 5).

Patent Document 1: Japanese Laid-Open Patent Publication No. 2002-254573

Patent Document 2: WO2007/032170

Patent Document 3: Japanese Laid-Open Patent Publication No. 2009-66891

Patent Document 4: Japanese Laid-Open Patent Publication No. 2008-181120

Patent Document 5: Japanese Patent No. 4221990

For optical laminates used in displays, antistatic properties have been required. Here, in order to be able to withstand use in outdoor use, it is required to have light resistance which does not change due to light such as sunlight. In addition, when the polarizing substrate and the cellulose triacetate protective film are bonded together, the protective film for the polarizing plate of the display is usually subjected to a treatment such as saponification to improve the adhesion between the polarizing substrate and the protective film. Therefore, the optical functional layer and the optical laminate which are laminated on the cellulose triacetate protective film are required to have saponification resistance which does not change in antistatic properties.

As shown in Patent Document 1, as an antistatic antiglare film having an antistatic function, a film in which a transparent conductive layer and an antiglare layer are sequentially laminated on a transparent substrate film has been proposed, and in this structure, antistatic It is excellent in the properties, anti-glare properties, and the like. However, since it has a structure in which two layers are laminated on the transparent base film, there is a problem that the cost is high.

As disclosed in Patent Documents 2 and 3, an optical layered body having a structure in which one layer is laminated on a transparent base film, which contains a quaternary ammonium salt system for imparting antistatic properties, can be obtained by coating a resin layer. Although the light-transmitting fine particles for imparting anti-glare properties are added to the compound, this structure causes a problem that the conductivity is lowered by the saponification treatment.

In the case of using an optical layered body having a conductive polymer such as polyaniline or polythiophene, since the organic conductive material is inferior in light resistance to an inorganic material and cannot maintain antistatic properties, it has been required to be improved. Here, as shown in Patent Document 4, in order to improve light resistance, a method of mixing a resin having a high glass transition point has been proposed. However, since the resin having a high glass transition point used herein has a low hardness, the surface hardness is low. The problem of reduced scratch resistance.

The antistatic hard coat film described in Patent Document 5 is excellent in antistatic property and scratch resistance. However, a fluorine material for controlling the refractive index is added to the antistatic hard coat film, and sufficient antifouling property is not obtained. When the saponification treatment is performed, the fluorine material in the hard coat layer is eluted, and the antifouling property is lowered. . That is, it is required to improve the antifouling property after the saponification treatment.

In view of the above, an object of the present invention is to provide an optical layered body, a polarizing plate, and a display device using the optical layered body which have excellent antistatic properties and are excellent in light resistance, saponification resistance, and scratch resistance.

Further, an object of the present invention is to provide an optical layered body which exhibits antistatic property and antifouling property, and which is less likely to be deteriorated in antistatic property and antifouling property even when saponification treatment is performed, and a polarizing plate using the optical laminate. And display device.

The present invention solves the above technical problems by the following technical configuration.

(1) An optical layered body which is an optical layered body provided with at least an optical functional layer directly or via another layer on a light-transmitting substrate, the optical functional layer containing at least a conductive material, and a carbon arc on the surface of the optical layered body The surface resistivity after the (carbon arc) type light resistance test was 1.0 × 10 ¹² Ω / □ or less, and the ratio of surface resistivity before and after the carbon arc type light resistance test (R2 / R1; R1 is carbon arc type light resistance) The surface resistivity before the test, R2 is a surface resistivity after the carbon arc light resistance test, was 10 ⁴ or less.

(2) The optical layered body according to the above (1), wherein the saturated electrification voltage after the carbon arc type light resistance test is 1.5 kV or less.

(3) The optical layered body according to the above aspect, wherein the optical functional layer contains at least one of a resin component and a light-transmitting fine particle or an inorganic component capable of forming irregularities by agglomeration. .

The optical layered body according to any one of the above aspects, wherein the optical functional layer contains an ionizing radiation-curable fluorinated acrylate.

(5) The optical layered body according to the above aspect, wherein the optical functional layer is a layer obtained by curing a composition containing at least an ionizing radiation-curable fluorinated acrylate and a conductive metal oxide. The ionizing radiation-curable fluorinated acrylate has a molecular weight of 1,000 or more and contains three or more acrylonitrile groups.

The optical layered body according to the above aspect, wherein the ionizing radiation-curable fluorinated acrylate contains a perfluoroalkyl group.

The optical layered body according to the above-mentioned item (5), wherein the ionizing radiation-curable fluorinated acrylate has a fluorine atom content of 20% or more.

The optical layered body according to any one of the above aspects, wherein the ionizing radiation-curable fluorinated acrylate is a compound represented by the following formula (A).

(here, Cy is a cycloalkyl moiety of a 5- or 6-membered ring in which a part of hydrogen is substituted by the above formula and optionally substituted by a methyl group or an ethyl group, a is an integer of 1 to 3, and X is a methylene group Or direct bonding, R _F is a perfluoroalkyl group having 4 to 9 carbon atoms, and n is an integer of 1 to 3. When the above a is 2 or more, X, R _F and n are independently selected from each other.

The optical layered body according to any one of the above aspects, wherein the ionizing radiation-curable fluorinated acrylate is urethane acrylate.

(10) The optical layered body according to any one of (1) to (9), wherein The optical functional layer contains a composite of a π-conjugated conductive polymer and a polymer dopant.

The optical layered body according to any one of the above aspects, wherein the surface resistivity after the saponification treatment is 1.0 × 10 ¹⁰ Ω / □ or less.

(12) A polarizing plate obtained by the optical layered layer according to any one of (1) to (11) above which is applied to a polarizing substrate.

(13) A display device comprising the optical layered body according to any one of the above (1) to (11).

According to the inventions (1) to (13), it is possible to provide an optical layered body, a polarizing plate, and an optical layered body which have excellent antistatic properties and are excellent in light resistance, saponification resistance, and scratch resistance. Display device.

Further, according to the inventions (5), (12), and (13), it is possible to obtain an optical which exhibits antistatic properties and antifouling properties, and which is less likely to have antistatic properties and antifouling properties even when saponification treatment is performed. A laminate and a polarizing plate and a display device using the optical laminate.

According to the inventions (6) and (7), an effect of sufficiently introducing a fluorine atom can be obtained.

According to the invention (8), in particular, since the number of n of the perfluoroalkyl group (-C _n F _2n+1 ) is 4 to 9, the molecular chain containing fluorine concentrates to form a crystal structure, whereby a partial surface can be formed When the portion where the conductive metal oxide is exposed is obtained, the effect of not easily impeding the function of the conductive metal oxide is obtained.

According to the invention (9), it is possible to obtain an effect of improving the film formability, further improving the scratch resistance and elongation of the cured product, and improving the flexibility.

According to the invention (3), light-scattering fine particles form irregularities on the surface to scatter light or scatter light inside the optical function layer, whereby an effect that can be used as an anti-glare film is obtained.

The optical layered body according to the present embodiment has a basic structure in which an optical functional layer containing a resin component and a conductive material is laminated on a light-transmitting substrate. As a material for forming the optical functional layer, a light-transmitting fine particle or an inorganic component capable of forming irregularities by agglomeration is added, whereby an optical functional layer further having anti-glare properties can be provided.

Here, the optical functional layer may be laminated on one side of the light-transmitting substrate directly or via another layer on the light-transmitting substrate, or may be laminated on both surfaces of the light-transmitting substrate. Further, the optical laminate may have other layers. Here, examples of the other layer include a light diffusion layer, an antifouling layer, a polarizing substrate, a low reflection layer, and other function providing layers (for example, an antistatic layer, an ultraviolet ray, a near infrared ray (NIR) absorbing layer, and a color purity. (neon cut layer, electromagnetic wave shielding layer, hard coating). Further, the position of the other layer is, for example, in the case of a polarizing substrate, on the light-transmitting substrate opposite to the optical function layer, and in the case of a low-reflection layer, on the optical function layer, In the case of the functional imparting layer, it is the lower layer of the optical functional layer. A laminate in which a polarizing substrate, a light-transmitting substrate, and an optical functional layer are laminated in this order can be used as a polarizing plate. Hereinafter, each component (translucent substrate, resin component, and the like) of the optical layered body according to the present embodiment will be described in detail.

<Translucent substrate>

The light-transmitting substrate according to the preferred embodiment is not particularly limited as long as it has light transmissivity, and glass such as quartz glass or soda lime glass may be used, but polyethylene terephthalate (PET) may preferably be used. , cellulose triacetate (TAC), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA), polycarbonate (PC), polyimine (PI), polyethylene (PE) Polypropylene (PP), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), cyclic olefin copolymer (COC), norbornene-containing resin, polyether oxime, cellophane, aromatic polyamine, etc. Resin film. As the film, a film which is not stretched may be used, or a film which has been subjected to drawing processing may be used. From the viewpoint of excellent mechanical strength and dimensional stability, it is particularly preferable that the polyethylene terephthalate film subjected to biaxial stretching processing is preferably from the viewpoint that the phase difference in the film surface is extremely small. The stretched cellulose triacetate film (TAC) was not applied. In the case of PDP and LCD, these PET and TAC films are more preferable.

The higher the transparency of the light-transmitting substrate, the better, and the total light transmittance (JIS K7105) is preferably 80% or more, and more preferably 90% or more. Further, the thickness of the light-transmitting substrate is preferably a thin thickness from the viewpoint of weight reduction. However, in consideration of productivity and workability, a substrate having a range of 1 to 700 μm is preferably used, and preferably 20 to 250 μm is used. Matrix. When the optical laminate of the present invention is used for an LCD, it is preferred to use TAC of 20 to 80 μm as a light-transmitting substrate. In the optical layered body of the present invention, in particular, when TAC of 20 to 80 μm is used as the light-transmitting substrate, since curling can be prevented, it can be suitably used for LCD applications requiring thinner and lighter weight.

The surface of the light-transmitting substrate is subjected to a treatment such as alkali treatment, corona treatment, plasma treatment, or sputtering treatment, a primer such as a surfactant or a decane coupling agent, and a dry coating of a film such as Si vapor deposition. The adhesion between the light-transmitting substrate and the optical functional layer can be improved, and the scratch resistance, physical strength, and chemical resistance of the optical functional layer can be improved. Further, when another layer is provided between the light-transmitting substrate and the optical functional layer, the adhesion of the interface of each layer can be improved by the same method as described above, and the physical strength and chemical resistance of the optical functional layer can be improved. .

<Optical functional layer>

The optical functional layer is a layer formed by curing a resin component and a conductive material by curing the resin component. In the optical functional layer, in addition to the resin component and the conductive material, when the light-transmitting fine particles or the inorganic component capable of forming the unevenness are formed by aggregation, the anti-glare property can be further provided, which is preferable.

[resin composition]

The resin component constituting the optical functional layer can be used without any particular limitation as long as it is a resin component having sufficient strength and transparency to be formed after curing. Examples of the resin component include a thermosetting resin, a thermoplastic resin, an ionizing radiation-curable resin, and a two-liquid mixing resin. Among them, an ionizing radiation-curable resin is suitable for curing treatment by electron beam or ultraviolet irradiation. It can be effectively cured by simple processing operations.

As the ionizing radiation curable resin, a radical polymerizable functional group such as an acrylonitrile group, a methacryl fluorenyl group, an acryloxy group, or a methacryloxy group can be used singly or in a form of a suitable mixture. A monomer, oligomer or prepolymer of a cationically polymerizable functional group such as an epoxy group, a vinyl ether group or an oxetanyl group. Examples of the monomer include methyl acrylate, methyl methacrylate, methoxy polyethylene glycol methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, and ethylene glycol. Dimethacrylate, dipentaerythritol hexaacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, and the like. Examples of the oligomer and the prepolymer include polyester acrylate, polyurethane acrylate, polyfunctional urethane acrylate, epoxy acrylate, polyether acrylate, and alkyd (alkyd). Acrylate compound such as acrylate, melamine acrylate or decyl acrylate, unsaturated polyester, tetramethyl diol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, bisphenol A Glycidyl ether, epoxy compounds such as various alicyclic epoxy groups, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis{[(3-ethyl-3-oxa) An oxetane compound such as cyclobutyl)methoxy]methyl}benzene or bis[1-ethyl(3-oxetanyl)]methyl ether. These can be used alone or in combination.

Among these ionizing radiation-curable resins, the (meth)acryloxy group is a polyfunctional monomer or a polyfunctional urethane acrylate having three or more polyfunctional monomers, and the curing speed can be increased and the hardness of the cured product can be increased. Further, when it is used in combination with a conductive material, since the conductive material is fixed in the highly crosslinked molecular chain, there is an effect that it is difficult to cause the conductive material component to fall off due to the saponification treatment or the light resistance test. It is not easy to cause a decrease in conductivity due to the saponification treatment, and it is difficult to cause a decrease in antistatic property due to the light resistance test.

In addition, when the polyfunctional urethane acrylate is used, the hardness and flexibility of the cured product can be imparted, and the effect of improving the viscosity can be imparted when the coating material is formed. Therefore, the film forming property can be improved.

The ratio of the ionizing radiation-curable resin contained in the optical functional layer is not particularly limited, and is preferably 20 to 80% by mass, and more preferably 30 to 70% by mass, based on 100 parts by mass of the resin composition.

The ionizing radiation that cures the resin composition may be any of ultraviolet light, visible light, infrared light, and electron beam. In addition, these radiations may be polarized or non-polarized. From the viewpoints of equipment cost, safety, operating cost, and the like, ultraviolet rays are particularly preferred. As the energy source of the ultraviolet light, for example, a high pressure mercury lamp, a halogen lamp, a xenon lamp, a metal halide lamp, a nitrogen molecular laser, an electron beam acceleration device, a radioactive element, or the like is preferable. The irradiation amount of the energy source is preferably in the range of 100 to 5000 mJ/cm ² , more preferably in the range of 300 to 3000 mJ/cm ² , and more preferably less than 100 mJ/cm ² , as the cumulative exposure amount at the ultraviolet wavelength of 365 nm. The curing is insufficient, and therefore, the hardness of the optical functional layer may be lowered. Further, when it exceeds 5000 mJ/cm ² , the optical functional layer is colored, and the transparency is lowered.

As the ionizing radiation-curable resin, ionizing radiation-curable fluorinated acrylate can be used. The ionizing radiation-curable fluorinated acrylate is ionizing radiation-curable type compared with other fluorinated acrylates, thereby enabling intermolecular cross-linking. Therefore, it is excellent in chemical resistance and sufficient after saponification treatment. The effect of antifouling.

When the ionizing radiation-curable fluorinated acrylate is used in combination with a conductive material, the fluorine component of the fluorinated acrylate is segregated in the vicinity of the surface layer of the optical functional layer, whereby the following effects can be obtained, that is, saponification treatment and light resistance are less likely to occur. In the test, problems such as dropping of the conductive material component occur, and it is difficult to cause an antistatic property to be lowered by the saponification treatment, and it is difficult to cause a decrease in the antistatic property due to the light resistance test. Here, the "surface layer" will be described based on Fig. 1 . FIG. 1 is an optical layered body 1 in which an optical functional layer 20 is laminated on a light-transmitting substrate 10. In Fig. 1, an anti-glare layer is described as an example of an optical functional layer. An optical layered body having an antiglare layer as an optical functional layer can be used as an antiglare film having antiglare property, which is preferable. The surface side of the optical function layer 20 that is spaced apart from the light-transmitting substrate 10 by a certain distance is the surface layer 21.

Here, when a fluorine-based surfactant is used instead of the ionizing radiation-curable fluorinated acrylate, the following problems occur: (1) excessive swelling of the fluorine component to the surface and impairing the function of the conductive agent; (2) due to the fluorine-based surface Since the active agent is not an ionizing radiation curing type, the components are detached during the saponification treatment, and the conductive component is detached, and the antistatic property is lost.

As the ionizing radiation-curable fluorinated acrylate, for example, 2-(perfluorodecyl)ethyl methacrylate, 2-(perfluoro-7-methyloctyl)ethyl methacrylate, methacrylic acid can be used. 3-(perfluoro-7-methyloctyl)-2-hydroxypropyl ester, 2-(perfluoro-9-methylindenyl)ethyl methacrylate, 3-(perfluoro-8-methacrylate) Methylmercapto)-2-hydroxypropyl ester, 3-perfluorooctyl-2-hydroxypropyl acrylate, 2-(perfluorodecyl)ethyl acrylate, 2-(perfluoro-9-methyl hydrazide) Ethyl ester, pentafluorooctyl (meth)acrylate, undecafluoroethyl (meth)acrylate, nonafluoropentyl (meth)acrylate, pentafluorobutyl (meth)acrylate, (methyl) ) octafluoropentyl acrylate, pentafluoropropyl (meth) acrylate, trifluoro(meth) acrylate, trifluoroisopropyl (meth) acrylate, trifluoroethyl (meth) acrylate, the following compounds (i) to (xxx) and so on. The following compounds are all compounds which are acrylates, and the propylene fluorenyl group in the formula can be changed to a methacryl fluorenyl group.

These can be used alone or in combination. Among the fluorinated acrylates, a fluorinated alkyl group-containing urethane acrylate having a urethane bond is preferred from the viewpoint of scratch resistance and elongation of the cured product and flexibility. Further, among the fluorinated acrylates, polyfunctional fluorinated acrylates are suitable. The polyfunctional fluorinated acrylate herein means a fluorinated acrylate having two or more (preferably three or more, more preferably four or more) (meth) acryloxy groups.

The ionizing radiation-curable resin can be cured by directly irradiating an electron beam, and the radiation to be used may be any of ultraviolet light, visible light, infrared light, and electron beam. In addition, these radiations may be polarized or non-polarized.

When curing by ultraviolet irradiation, it is necessary to add a photopolymerization initiator. As the photopolymerization initiator, a conventionally known initiator can be used. For example, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, N,N,N,N-tetramethyl-4,4'-diamine can be illustrated. Benzoin and its alkyl ethers such as benzophenone and benzil methyl ketal; acetophenone, 3-methylacetophenone, 4-chlorobenzophenone, 4,4 Acetophenones such as '-dimethoxybenzophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone; methyl hydrazine, 2-B Anthraquinones such as hydrazine, 2-pentylhydrazine, xanthone, thioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthene Thioxones such as ketones; ketals such as acetophenone dimethyl ketal and benzoin dimethyl ketal; benzophenone, 4,4-di(methylamino)benzophenone And other benzophenones; and 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one. These can be used individually or as a mixture of 2 or more types. The amount of use of the photopolymerization initiator is preferably about 5% or less, and more preferably from 1 to 4%, based on the total amount of the solid content of the radiation-curable resin composition.

Further, the ionizing radiation-curable resin may contain an additive such as a leveling agent, a thickener, an antistatic agent, a filler, and an extender pigment. For example, the leveling agent has a function of uniformizing the tension on the surface of the coating film and repairing the defect before forming the coating film, and a material having lower interfacial tension and surface tension than the ionizing radiation-curable resin can be used.

The blending amount of the resin component such as the ionizing radiation-curable resin is preferably 50% by mass or more, and more preferably 60% by mass or more based on the total mass of the solid component in the resin composition constituting the optical functional layer. The upper limit is not particularly limited and is, for example, 99.6% by mass. If it is less than 50% by mass, there is a problem that sufficient hardness cannot be obtained.

The solid content of the resin component such as the ionizing radiation-curable resin includes all the solid components other than the inorganic component to be described later, and includes not only the solid component of the resin component such as the ionizing radiation-curable resin but also the solid component of any other component.

[conductive material]

The optical functional layer of the present invention contains a conductive material. By adding a conductive material, it is possible to effectively prevent dust from adhering to the surface of the optical layered body. Specific examples of the conductive material include a quaternary ammonium salt, a pyridinium salt, and various cationic compounds having a cationic group such as a primary to tertiary amine group, and have a sulfonate group, a sulfate group, and a phosphate. An anionic compound of an anionic group such as a salt group or a phosphonate group, an amino acid system, a guanamine sulfate system, or the like An amphoteric compound, a nonionic compound such as an amino alcohol system, a glycerol system or a polyethylene glycol system; an organometallic compound such as an alkoxide of tin or titanium; and a metal chelate compound such as an acetoacetone salt thereof; Further, a compound obtained by polymerizing the above-listed compounds can be mentioned. Further, a polymerizable compound such as an organometallic compound having a tertiary amino group, a quaternary ammonium group or a metal chelate portion and having a monomer, an oligomer or a functional group coupling agent which can be polymerized by ionizing radiation is also Can be used as an antistatic agent.

Further, conductive fine particles can be mentioned. Specific examples of the conductive fine particles include fine particles composed of a metal oxide (hereinafter also referred to as a conductive metal oxide). Examples of such a conductive metal oxide include ZnO, CeO ₂ , Sb ₂ O ₂ , Sb ₂ O ₃ , Sb ₂ O ₅ , SnO ₂ , indium tin oxide, which is often abbreviated as ITO, and In ₂ O ₃ . Al ₂ O ₃ , antimony-doped tin oxide (abbreviated as ATO), aluminum-doped zinc oxide (abbreviated as AZO), and the like. The conductive metal oxide is not particularly limited, and examples thereof include indium tin oxide, antimony-doped tin oxide (ATO), zinc antimonate, and antimony oxide. One type of the conductive metal oxide may be selected, or two or more of them may be used in combination. Among them, tin oxide doped with antimony is preferred. The microparticles mean submicron-sized particles of 1 μm or less, preferably fine particles having an average particle diameter of 0.1 nm to 0.1 μm. The average particle diameter of the conductive metal oxide is not particularly limited, and is, for example, preferably 2 to 30 nm, more preferably 5 to 25 nm. The average particle diameter was obtained by photographing with a transmission electron microscope (TEM), and the particle diameter of the primary particles was measured for 100 particles, and the average value was obtained. By using the conductive metal oxide having such a particle diameter, the effect of suppressing coloring by the conductive metal oxide can be obtained. The ratio of the conductive metal oxide contained in the optical functional layer is not particularly limited, and is preferably from 1 to 40% by mass, more preferably from 3 to 35% by mass, even more preferably 5 parts by mass based on 100 parts by mass of the resin composition. Up to 20% by mass. If it is less than 1% by mass, the antistatic property tends to be insufficient. If it exceeds 40% by mass, the optical functional layer is colored, or the transparency of the optical functional layer is easily reduced, and thus it is not expected.

Moreover, as another specific example of a conductive material, a π-conjugated conductive polymer is mentioned. The π-conjugated conductive polymer is not particularly limited as long as it is a polymer having a π-conjugated main chain, and examples thereof include polyacetylene and polyacene derived from an aliphatic conjugated system. ), polyazulene, aromatic conjugated polyphenylene, heterocyclic conjugated polypyrrole, polythiophene, polyisothianaphthene, polyaniline containing hetero atom conjugated, poly (thiophene vinylene), a mixed conjugated poly(phenylene vinylene), a conjugated system having a plurality of conjugated chains in a molecule, that is, a multichain conjugated system, and a derivative of the conductive polymer thereof And at least one selected from the group consisting of a conductive composite obtained by copolymerizing or block-polymerizing these conjugated polymer chains with a saturated polymer. Among them, a conjugated conductive polymer such as polythiophene, polyaniline or polypyrrole is more preferably used. By using the above π-conjugated conductive polymer, it is possible to improve the total light transmittance of the optical layered body and to lower the haze value while exhibiting excellent antistatic properties. Further, for the purpose of improving conductivity and improving antistatic performance, an anion such as an organic sulfonic acid or a ferric chloride is added as a dopant (electron donor), and it can also be used as a composite. The composite of the conjugated conductive polymer and the polymer dopant has a particularly high transparency and antistatic property depending on the effect of adding the dopant, which is preferable.

The composite of the π-conjugated conductive polymer and the polymer dopant is preferably a doped polystyrene sulfonic acid from the viewpoint of high thermal stability and transparency after coating film formation. Poly(3,4-ethylenedioxythiophene) (abbreviated as PEDOT-PSS).

The conductive material must be contained in an amount of from 0.3 to 20.0% by mass, preferably from 0.5 to 15.0% by mass, based on the total mass of the solid component in the resin composition. If the compounding amount of the conductive material is less than 0.3% by mass, it is difficult to exhibit antistatic properties. If the amount of the conductive material is more than 20% by mass, the transparency may be impaired.

Here, when a composite of a π-conjugated conductive polymer and a polymer dopant is mixed with an ionizing radiation-curable resin and cured by radiation, the composite is uniformly dispersed in the optical functional layer (in-plane and In the depth direction, it is difficult to reduce the antistatic property due to the saponification treatment and the light resistance test. Further, as the ionizing radiation-curable resin, prepolymerization is carried out by a monomer or oligomer having 3 (more preferably 4, more preferably 5) or more (meth) acryloxy group in one molecule. A compound such as a polyfunctional acrylate, a polyfunctional urethane acrylate or a polyfunctional fluorinated acrylate is used in combination, so that after radiation curing, a composite of a π-conjugated conductive polymer and a polymer dopant is It is fixed in the molecular gap of the resin component which is firmly crosslinked, and thus it is difficult to reduce the antistatic property due to the saponification treatment and the light resistance test. Further, the composite of the π-conjugated conductive polymer and the polymer dopant is not segregated in the vicinity of the surface layer of the optical functional layer, and is appropriately dispersed in the thickness direction, whereby the antistatic property due to the light resistance test can be suppressed. reduce.

Among the conductive materials, the composite of the π-conjugated conductive polymer and the polymer dopant can have antistatic properties at a smaller amount than other conductive materials. Therefore, it is preferable from the viewpoint of being easily mixed with the light-transmitting fine particles for imparting anti-glare properties and the inorganic component capable of forming irregularities by aggregation.

In order to improve the antistatic property reduction by the light resistance test, there is a method of adding a UV absorber to a mixture of a resin component and a conductive material. However, in this method, when an ionizing radiation-curable resin having excellent hardness is used as the resin component, the problem of hindering curing by ultraviolet irradiation is caused, and therefore the scratch resistance required for the optical layered body is likely to be reduced. In the present invention, since the antistatic property due to light resistance can be suppressed even if the ultraviolet absorber is not applied, it is possible to achieve both scratch resistance and antistatic property which have been difficult to obtain in the past.

[Light-transmitting particles]

By including the light-transmitting fine particles in the optical functional layer, the surface layer of the optical functional layer can be formed into irregularities. As the light-transmitting fine particles, an organic compound formed of an acrylic resin, a polystyrene resin, a styrene-acrylic copolymer, a polyethylene resin, an epoxy resin, an anthrone resin, a polyvinylidene fluoride resin, a polyvinyl fluoride resin, or the like can be used. Inorganic light-transmitting fine particles such as light-transmitting resin particles, cerium oxide, aluminum oxide, titanium oxide, zirconium oxide, calcium oxide, tin oxide, indium oxide, or cerium oxide. The light-transmitting fine particles have a certain degree of diameter and have a refractive index difference from a matrix in the optical functional layer, and have a function of forming irregularities on the surface to scatter light or to scatter light inside the optical functional layer. An optical layered body including an optical functional layer containing translucent fine particles can be used as an antiglare film. Here, the average particle diameter of the light-transmitting fine particles is preferably from 0.3 to 10 μm, more preferably from 1 to 8 μm. When the particle diameter is less than 0.3 μm, the antiglare property is lowered, and when it is more than 10 μm, flicker is generated, and the surface unevenness is excessively large, so that the surface appears white, which is not expected. The refractive index of the light-transmitting fine particles is preferably 1.40 to 1.75, and when the refractive index is less than 1.40 or more than 1.75, the difference in refractive index from the light-transmitting substrate or the resin matrix is too large, and the total light transmittance is lowered. Further, the difference in refractive index between the light-transmitting fine particles and the resin component is preferably 0.2 or less. The ratio of the light-transmitting fine particles contained in the optical functional layer is not particularly limited, and when it is 1 to 20% by mass based on 100 parts by mass of the resin composition, the characteristics such as anti-glare function and flicker can be satisfied, and the surface of the optical functional layer can be easily controlled. The fine uneven shape and the haze value are preferable. Here, "refractive index" means a measured value based on JIS K-7142. In addition, "average particle diameter" means the average value of the diameter of 100 particle|grains measured by the electron microscope.

The average particle diameter of the light-transmitting fine particles is preferably in the range of 0.3 to 10 μm, more preferably 1 to 8 μm. When the particle diameter is less than 0.3 μm, the antiglare property is lowered, and when it is more than 10 μm, flicker is generated, and the surface unevenness is excessively large, so that the surface appears white, which is not expected.

[By agglomerating an inorganic component capable of forming irregularities]

Further, the optical functional layer of the present invention can be produced by forming concavities and convexities by aggregation of inorganic components. The inorganic component to be used may be an inorganic component contained in the optical functional layer and agglomerated to form surface irregularities during film formation. Examples of the inorganic component include metal oxide sols such as cerium sol and zirconia sol, AEROSIL, expanded clay, and layered organic clay. Among these inorganic components, layered organic clay is preferred from the viewpoint of stably forming surface unevenness. The reason why the layered organic clay can stably form the surface unevenness is that the layered organic clay has high compatibility with the resin component (organic component) and also has cohesiveness, so that the first phase and the second phase are easily interwoven. The structure is easy to form surface irregularities during film formation. In the present invention, the so-called layered organic clay refers to a clay in which organic onium ions are introduced between layers of an expandable clay. The layered organic clay has low dispersibility for a specific solvent, and when a layered organic clay and a solvent having a specific property are used as a coating for forming an optical functional layer, the solvent is selected to be in the optical functional layer containing no particles. An optical functional layer having surface irregularities is formed.

(expanded clay)

The expandable clay may be a natural material or a composite (including a substitute or a derivative) as long as it has a cation exchange capacity and allows water to enter and expand between the layers of the expandable clay. Alternatively, it may be a mixture of natural materials and synthetics.

Examples of the swelling clay include mica, synthetic mica, vermiculite, montmorillonite, iron montmorillonite, beidellite, saponite, hectorite, stevensite, and nontronite. , magadiite, magella, sulphite, layered titanic acid, smectite, synthetic smectite, and the like. These expandable clays may be used alone or in combination of two or more.

(organic cerium ion)

The organic phosphonium ion is not particularly limited as long as it can be organicized by the cation exchange property of the swelling clay. As the cerium ion, for example, a quaternary ammonium salt such as dimethyl distearyl ammonium salt or trimethyl stearyl ammonium salt, an ammonium salt having a benzyl group or a polyoxyethylene group may be used, or ruthenium may be used. An ion formed by a salt, a pyridinium salt, or an imidazolium salt. The salt may, for example, be a salt formed with an anion such as Cl ^- , Br ^- , NO ₃ ^- , OH ^- or CH ₃ COO ^- . As the salt, a quaternary ammonium salt is preferably used.

The functional group of the organic phosphonium ion is not limited, and a material containing any one of an alkyl group, a benzyl group, a polyoxypropylene group or a phenyl group is preferably used because the antiglare property can be easily exhibited.

A preferred range of the alkyl group is a carbon number of 1 to 30, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a decyl group, and an anthracene group. Base, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, octadecyl and the like.

The preferred range of n of the polyoxypropylene group [(CH ₂ CH(CH ₃ )O) _n H or (CH ₂ CH ₂ CH ₂ O) _n H] is from 1 to 50, particularly preferably from 5 to 50, The more the molar number of addition, the better the dispersibility of the organic solvent, but if it is excessively excessive, the product will have adhesiveness. Therefore, if the dispersibility to the solvent is emphasized, the number of n is preferably 20. To 50. Further, when the number of n is 5 to 20, the product is non-adhesive and excellent in pulverizability. Further, the total number of n of the quaternary ammonium salt as a whole is preferably from 5 to 50 from the viewpoint of dispersibility and workability.

Specific examples of the quaternary ammonium salt include tetraalkylammonium chloride, tetraalkylammonium bromide, polyoxypropylene 1,3-trialkylammonium chloride, polyoxypropylene 1,3-trialkylammonium chloride. , bis(polyoxypropylene) ‧ dialkyl ammonium chloride, di (polyoxypropylene) ‧ dialkyl ammonium bromide, tri (polyoxypropylene) ‧ alkyl ammonium chloride, three (polyoxypropylene Support) ‧ alkyl ammonium bromide and the like.

In the quaternary ammonium ion of the formula (I), R ^{1 is} preferably a methyl group or a benzyl group. R ^{2 is} preferably an alkyl group having 1 to 12 carbon atoms, particularly preferably an alkyl group having 1 to 4 carbon atoms. R ^{3 is} preferably an alkyl group having 1 to 25 carbon atoms. R ^{4 is} preferably an alkyl group having 1 to 25 carbon atoms, a (CH ₂ CH(CH ₃ )O) _n H group or a (CH ₂ CH ₂ CH ₂ O) _n H group. n is preferably from 5 to 50.

The blending amount of the layered organic clay to be contained is preferably from 0.1 to 10% by mass, particularly preferably from 0.2 to 5% by mass, based on the total mass of the solid content in the resin composition. If the blending amount of the layered organic clay is less than 0.1% by mass, there is a problem that a sufficient amount of surface unevenness cannot be formed and the antiglare property is insufficient. When the blending amount of the layered organic clay exceeds 10% by mass, there is a problem that the number of surface unevenness increases and the visibility is impaired.

As the solvent, it is preferred to contain a first solvent and a second solvent as a solvent for forming surface irregularities for obtaining anti-glare properties.

By adding the first solvent and the second solvent to the resin composition of the present invention described above, a coating material capable of forming the optical functional layer of the present invention can be obtained. Since the coating material capable of forming the optical functional layer of the present invention contains the first solvent and the second solvent, it can be produced without adding conventionally necessary fine particles for forming the surface unevenness of the optical functional layer. The surface irregular shape of the optical functional layer.

The first solvent refers to a solvent which does not substantially turbid the layered organic clay and can be dispersed in a state of being transparent. Substantially no turbidity means that, besides not producing turbidity at all, it is also considered to be a case where turbidity does not occur. Specifically, the first solvent is a solvent having a haze value of 10% or less by adding 1000 parts by mass of the first solvent to 100 parts by mass of the layered organic clay. The haze value of the mixed liquid to which the first solvent is added is preferably 8% or less, and particularly preferably 6% or less. The lower limit of the haze value of the mixed solution is not particularly limited and is, for example, 0.1%.

As the first solvent, for example, a so-called solvent having a small polarity (non-polar solvent) can be used. This is because the layered organic clay is easily dispersed by the above solvent because it is organically treated. The first solvent which can be used differs depending on the type of the layered organic clay. For example, when synthetic smectite is used as the layered organic clay, an aromatic solvent such as benzene, toluene or xylene can be used as the first solvent. These first solvents may be used alone or in combination of two or more.

The second solvent refers to a solvent which can disperse the layered organic clay in a state of being turbid. Specifically, the second solvent is a solvent having a haze value of 30% or more by mixing 1000 parts by mass of the second solvent with respect to 100 parts by mass of the layered organic clay. The haze value of the mixed liquid to which the second solvent is added is preferably 40% or more, and more preferably 50% or more. The upper limit of the haze value of the mixed solution is not particularly limited and is, for example, 99%.

As the second solvent, for example, a so-called polar solvent can be used. This is because, since the layered organic clay is subjected to an organic treatment, it is difficult to be dispersed by the above solvent. The second solvent that can be used differs depending on the type of the layered organic clay. For example, when synthetic smectite is used as the layered organic clay, water, methanol, ethanol, propanol, or isopropanol can be used as the second solvent. Methyl ethyl ketone, isopropyl alcohol, and the like. These second solvents may be used singly or in combination of two or more.

Here, in order to easily form surface unevenness for obtaining anti-glare property, it is preferred to use a first solvent and a second solvent in combination. The mixing ratio of the first solvent and the second solvent is preferably in the range of 10:90 to 90:10 in terms of mass ratio, and it is easy to form surface unevenness for obtaining anti-glare property. The mixing ratio of the first solvent and the second solvent is preferably in the range of 15:85 to 85:15, more preferably in the range of 20:80 to 80:20, in terms of mass ratio. If the first solvent is less than 10 parts by mass, there is a problem that appearance defects occur due to undissolved matter. If the first solvent exceeds 90 parts by mass, there is a problem that surface unevenness for obtaining sufficient anti-glare property is not obtained.

Further, the blending amount of the resin composition and the solvent (solvent in which the first solvent and the second solvent are combined) may be in the range of 70:30 to 30:70 in terms of mass ratio. When the resin composition is less than 30 parts by mass, there is a problem in that drying unevenness occurs, the appearance is deteriorated, and the number of surface irregularities is increased to impair visibility. When the resin composition exceeds 70 parts by mass, the solubility of the solid component is easily impaired, so there is a problem that film formation cannot be achieved.

(When the method of forming the unevenness by the inorganic component and the method of providing the unevenness by the fine particles)

A method of forming irregularities by agglomeration of inorganic components and a method of imparting irregularities by fine particles can be combined. By adding translucent fine particles to the resin composition, it is easy to adjust the shape and number of surface irregularities of the optical functional layer.

When fine particles are added to the optical functional layer forming coating material to form an optical functional layer, the fine particles are segregated in the edge portion (the concave portion of the optical functional layer) of the convex portion formed by the aggregation of the inorganic components.

The reason why the fine particles are segregated on the edge of the convex portion is considered as follows.

In the coating layer after coating, the fine particles form agglomerated structure in the convection region, and the segregation starts to be segregated at the edge of the agglomerated structure. In the drying step, when the fluidity of the coating liquid disappears, the fine particles are fixed and finally segregate at the edge of the convex portion.

By adding fine particles, there is an advantage that the formation of surface unevenness formed by aggregation of inorganic components can be adjusted. By adjusting the shape of the surface of the optical functional layer, the scratch resistance and surface hardness of the surface of the optical functional layer can be improved.

(polarized substrate)

In the present invention, a polarizing substrate may be laminated on a light-transmitting substrate opposite to the optical functional layer. A polarizing plate can be produced by using an optical functional layer, a light-transmitting substrate, and a polarizing base volume layer. These layers may be directly laminated to each other or may be laminated via another layer such as an adhesive layer. Here, as the polarizing substrate, a light-absorbing polarizing film that transmits only other polarized light and absorbs other light, or a reflective polarizing film that transmits only a specific polarized light and reflects other light can be used. As the light absorbing polarizing film, a film obtained by stretching polyvinyl alcohol or polyvinylene can be used, and for example, a polyvinyl alcohol adsorbing iodine or a dye as a dichroic unit can be used. A polyvinyl alcohol (PVA) film obtained by axial stretching. For example, the "DBEF" manufactured by 3M Company, which is a light-reflective type of polarizing film, is composed of two types of polyester resins (PEN and PEN copolymer) having different refractive indices in the stretching direction during stretching. Hundreds of layers are alternately laminated and stretched by extrusion molding technology; "NIPOCS" manufactured by Nitto Denko Corporation or "TRANSMAX" manufactured by Merck Corporation, etc., which is composed of a cholesteric liquid crystal polymer layer and 1/4 The wavelength plate laminates the light incident from the side of the cholesteric liquid crystal polymer layer into two circularly polarized lights opposite to each other, transmitting one side and reflecting the other side, and the 1/4 wavelength plate will be in the cholesteric type. The circularly polarized light transmitted in the liquid crystal polymer layer is converted into linearly polarized light.

A polarizing plate for a liquid crystal display, a polarizing substrate obtained by stretching a dyed polyvinyl alcohol by a triacetylcellulose-based protective film provided with an optical functional layer such as an antiglare layer or a hard coat layer, and three The cellulose acetate-based protective film is formed by laminating.

When the polarizing substrate and the cellulose triacetate protective film are bonded together, saponification treatment is performed to improve the adhesion between the polarizing substrate and the protective film. Here, the saponification treatment is carried out for the purpose of hydrophilizing the surface of the cellulose triacetate film without providing a coating layer (optical functional layer) such as an antiglare layer. However, since the saponification treatment is performed by immersing the entire film provided with the coating layer such as the optical functional layer in various solutions, the surface of the coating layer provided on the optical functional layer such as cellulose triacetate is also treated.

The hydrophilization of the surface of the cellulose triacetate by the saponification treatment can be confirmed by measuring the contact angle of water, and the contact angle of water on the surface of the cellulose triacetate film is 55° or more before the treatment and 20° or less after the treatment. At the time, it was found that the saponification treatment was carried out properly.

The saponification treatment is carried out by immersing in an aqueous alkaline solution, washing with water, immersion in an acidic aqueous solution, neutralization, water washing, and heat drying. Here, the component for forming the coating layer provided on the cellulose triacetate may be eluted into an alkaline aqueous solution or an acidic aqueous solution by saponification treatment, whereby deterioration in characteristics may occur. Therefore, the saponification resistance is required for the optical functional layer or the optical laminate to be laminated on the triacetylcellulose-based protective film, and it is particularly required to reduce the deterioration of the antistatic property due to the saponification treatment.

Further, in the cellulose triacetate-based protective film for a polarizing plate, a coating layer such as a saponified anti-glare layer is exposed on the surface, and therefore, an optical functional layer laminated on the triacetylcellulose-based protective film, The optical laminate needs to have both saponification resistance and light resistance.

The optical layered body of the present invention containing an optical functional layer is excellent in both light resistance and saponification resistance.

That is, the optical functional layer and the optical laminate of the present invention are irradiated for 80 hours after the carbon arc type light resistance test under the conditions of illuminance of 500 W/m ² (measurement wavelength range of 300 to 700 nm) and blackboard temperature of 50±5 ° C. The ratio (R2/R1) of the surface resistivity R2 to the surface resistivity R1 at the time of no treatment needs to be 10 ⁴ or less, preferably 10 ³ or less, and particularly preferably 10 ² or less. Further, in the optical functional layer and the optical laminate of the present invention, the ratio (R3/R1) of the surface resistivity R1 at the time of untreatment and the surface resistivity R3 after the saponification treatment is preferably 10 or less, more preferably 5.0 or less. Jia is 1.0 or less. In addition, the surface resistivity R4 after the saponification treatment and the illuminance of 500 W/m ² (measurement wavelength range of 300 to 700 nm) and the blackboard temperature of 50 ± 5 ° C for 80 hours of the carbon arc type light resistance test and the untreated The ratio (R4/R1) of the surface resistivity R1 needs to be 10 ⁴ or less, preferably 10 ³ or less, and particularly preferably 10 ² or less.

The image sharpness of the optical functional layer and the optical laminate of the present invention is preferably in the range of 5.0 to 80.0 (value measured by a 0.5 mm optical comb based on JIS K7105), more preferably 20.0 to 75.0. If the image sharpness is less than 5.0, the contrast is deteriorated, and if it exceeds 80.0, the anti-glare property is deteriorated, and therefore, it is not suitable for an optical layered body for use in a display surface.

The total optical transmittance of the optical functional layer and the optical laminate of the present invention based on JIS K7105 is preferably 91.0% or more, more preferably 92.0% or more, and particularly preferably 93.0% or more. If the total light transmittance is less than 91.0%, the contrast is deteriorated, and it is not suitable for an optical laminate for displaying the surface thereof.

Further, in order to exhibit antistatic properties and antifouling properties, and antistatic properties and antifouling properties are not lowered even when the saponification treatment is performed, the following embodiments are more desirable. The optical layered body according to the present embodiment has an optical functional layer and a light-transmitting substrate obtained by curing a composition containing an ionizing radiation-curable fluorinated acrylate and a conductive metal oxide. Here, the optical functional layer may be laminated on one surface of the light-transmitting substrate or may be laminated on both surfaces. Further, the optical laminate may have other layers. Here, examples of the other layer include a polarizing substrate and other function providing layers (for example, near-infrared rays (NIR), an absorbing layer, a color purity promoting layer, and an electromagnetic wave shielding layer). Further, the position of the other layer is, for example, in the case of a polarizing substrate, on the light-transmitting substrate opposite to the optical functional layer, and in the case of another functional imparting layer, the lower layer of the optical functional layer. . However, it is preferable that the optical layered body is composed only of a light-transmitting substrate and an optical functional layer directly provided on the light-transmitting substrate, since the number of layers can be reduced, and the composition according to the preferred embodiment of the present invention can be obtained as follows The optical layered body having such an optical layered body has a property of sufficiently satisfying characteristics required for application to an image display device such as a liquid crystal display. Hereinafter, each constituent element (optical functional layer, light-transmitting substrate, and the like) of the optical layered body according to the preferred embodiment of the present invention will be described in detail.

(ionizing radiation-curable fluorinated acrylate)

The ionizing radiation-curable fluorinated acrylate of the present embodiment has a molecular weight of 1,000 or more. As the ionizing radiation-curable fluorinated acrylate, a fluorinated acrylate having a molecular weight of 1,000 to 4,000 is preferably used. When the molecular weight is 1000 or more, even when the saponification treatment is performed, the antistatic property and the antifouling property are not easily lowered. When the molecular weight is less than 1,000, the fluorine atom cannot be sufficiently introduced, and sufficient leveling property cannot be obtained, so that it is not expected. When the molecular weight is more than 4,000, the crosslinking density is lowered, and sufficient hardness is not obtained, so that it is not expected.

By adding the ionizing radiation-curable fluorinated acrylate, the optical functional layer is excellent in chemical resistance, and sufficient antifouling properties can be exhibited even after the saponification treatment. In addition, the ionizing radiation-curable fluorinated acrylate is ionizing radiation-curable type, and cross-linking occurs between molecules, so that it is excellent in chemical resistance and after saponification treatment, compared with other non-ionizing radiation-curable compounds. It also exhibits sufficient antifouling effect. Preferably, the fluorinated acrylate component is segregated in the vicinity of the surface layer of the optical functional layer, and preferably the fluorine component in the fluorinated acrylate molecule is segregated in the vicinity of the surface layer of the optical functional layer. As a result, problems such as loss of the conductive metal oxide due to the saponification treatment are less likely to occur. For example, the side of the fluorinated acrylate which tends to be segregated on the surface side of the light-transmitting substrate means that the fluorine element ratio is 10% in the range of the surface of the optical functional layer containing the fluorinated acrylate to a depth of 5 nm. the above. The fluorine element ratio is measured by X-ray electron spectroscopy (Electron Spectroscopy for Chemical Analysis: hereinafter, referred to as "ESCA"). In ESCA, the ratio of the presence of fluorine is calculated from the peak areas of fluorine, carbon, oxygen, helium, and the like obtained at a depth of 5 nm. Further, when the surface of the optical functional layer was measured to a depth of 200 nm from the surface of the optical functional layer by ESCA, the fluorine present at the entire depth of 5 nm was measured from the surface of the optical functional layer to a depth of 5 nm at a range of 5 nm. The value of the element ratio divided by the average value of the fluorine element ratio present from the depth of 5 nm to 200 nm of the surface of the optical functional layer is preferably 10 or more, and more preferably 20 or more. The upper limit is not particularly limited, and is, for example, 1000 or less. By setting the value to 10 or more, the fluorine atom can be effectively present on the surface of the optical functional layer. Therefore, even if an expensive fluorine material is used, an optical layered body excellent in economic efficiency can be provided.

Preferably, the ionizing radiation-curable fluorinated acrylate contains a perfluoroalkyl group-containing acrylate represented by -C _n F _2n+1 and the number of n is 4 to 9. When n is 3 or less, a fluorine atom cannot be sufficiently introduced, and therefore it is not expected. When n is 10 or more, the crosslinking density is lowered and sufficient hardness is not obtained, so that it is not expected. When a fluorinated acrylate is applied, it is expected that a layer containing fluorine is segregated on the outermost surface to form a film. Therefore, when used in combination with a conductive metal oxide, a fluorine-containing layer may be formed in the upper layer of the conductive metal oxide, and the surface resistivity may increase. When the number of n of the perfluoroalkyl group (-C _n F _2n+1 ) is 4 to 9, the fluorine-containing molecular chain concentrates and forms a crystal structure, and therefore, a portion where the conductive metal oxide is partially exposed can be formed. It is preferable from the viewpoint of not impeding the function of the above-mentioned conductive metal oxide. When having a substituent having a fluorine atom such as a perfluoroalkyl group (-C _n F _2n+1 ) present at the end of the molecule, a perfluoroalkylene group (-C _n F _2n -) phase existing in the middle of the molecule In the period before the formation of the optical functional layer, the fluorine component in the molecule tends to be segregated in the vicinity of the surface layer of the optical functional layer, and the antifouling property is easily improved.

In the ionizing radiation-curable fluorinated acrylate, the fluorine atom content is preferably 20% or more. The ratio of the fluorine atom content to the amount of fluorine atoms in the molecular weight of the fluorinated acrylate is determined by the following formula.

Fluorine atom content = [(amount of fluorine atom contained in the molecule) / (molecular weight)] × 100

When an ionizing radiation-curable fluorinated acrylate having a fluorine atom content of less than 20% is used, in order to exhibit sufficient antifouling property, it is necessary to increase the amount of fluorinated acrylate to be used, which causes the following problem, that is, economically uneconomical. Or, the compatibility ratio must be determined after fully studying the compatibility with other materials in the case of a large amount of addition.

The ionizing radiation-curable fluorinated acrylate contains three or more acrylonitrile groups. Since three or more acrylonitrile groups are contained, the hardness of the optical functional layer can be improved. Further, when used in combination with a conductive metal oxide, since the conductive metal oxide is fixed in the highly crosslinked molecular chain, there is an effect that it is difficult to produce an antifouling component and conductivity by saponification treatment. When the metal oxide component is detached, it is difficult to cause antifouling properties and a decrease in conductivity due to the saponification treatment.

The ionizing radiation-curable fluorinated acrylate is preferably a urethane acrylate. Since the fluorinated acrylate is a urethane acrylate, the viscosity is high. Therefore, the film forming property is good. The fluorinated acrylate is preferably a urethane acrylate from the viewpoint of scratch resistance and elongation of the cured product and flexibility.

As the ionizing radiation-curable fluorinated acrylate, the following compounds (i) to (vii) and the like can be used. The following compounds are all compounds which represent an acrylate, and the propylene fluorenyl group in the formula may be more methacryloyl group.

These can be used alone or in combination. Among the fluorinated acrylates, a fluorinated alkyl group-containing urethane acrylate having a urethane bond is preferred from the viewpoint of scratch resistance and elongation of the cured product and flexibility. Further, among the fluorinated acrylates, polyfunctional fluorinated acrylates are preferred. The polyfunctional fluorinated acrylate herein means a fluorinated acrylate having three or more, more preferably four or more (meth) acryloxy groups.

The ionized radiation-curable fluorinated acrylate is preferably a compound represented by the following formula (A).

(wherein Cy is a cycloalkyl moiety of a 5- or 6-membered ring in which a part of hydrogen is substituted by the above formula and optionally substituted by a methyl group or an ethyl group, a is an integer of 1 to 3, and X is a methylene group Or direct bonding, R _F is a perfluoroalkyl group having 4 to 9 carbon atoms, and n is an integer of 1 to 3, wherein when a is 2 or more, X, R _F and n are independently selected from each other.

Among the compounds represented by the above formula (A), a compound represented by the following formula (B) is particularly preferred.

(wherein R _F is a perfluoroalkyl group having 4 to 9 carbon atoms, n is an integer of 1 to 3, m is an integer of 0 or 1 to 3, and n + m is an integer of 3 or less.)

More specifically, it is preferably the following compound of (1) or (2).

The ratio of the ionizing radiation-curable fluorinated acrylate contained in the optical functional layer is not particularly limited, and is preferably from 0.05 to 50% by mass, more preferably from 0.2 to 20% by mass, based on 100 parts by mass of the resin composition. When the blending amount of the ionizing radiation-curable fluorinated acrylate is less than 0.05% by mass, the water repellency and smoothness are lowered, and scratch resistance, antifouling property, and chemical resistance are deteriorated. If the compounding amount of the ionizing radiation-curable fluorinated acrylate is more than 50% by mass, the film formability may be deteriorated.

In the system of the above resin composition, a polymer resin can be added to the range which does not inhibit the polymerization hardening. The polymer resin is a thermoplastic resin which is soluble in an organic solvent used in an optical functional layer coating material to be described later, and specific examples thereof include an acrylic resin, an alkyd resin, a polyester resin, and a cellulose derivative. These resins preferably have an acidic functional group such as a carboxyl group, a phosphoric acid group or a sulfonic acid group.

<Optical laminate>

The optical functional layer-forming coating material containing the above-described constituent components is applied onto the light-transmitting substrate directly or via another layer, and then the optical functional layer is irradiated by irradiation or irradiation of an ion beam (for example, an electron beam or an ultraviolet ray). The formation layer is cured to form an optical functional layer, whereby the optical layered body of the present invention can be obtained. As the constituent component of the optical functional layer, the first solvent and the second solvent may be used in the case where at least one of the translucent particles or the inorganic component capable of forming the concavities and convexities is formed. The optical functional layer may be formed on one side of the light transmissive substrate or on both sides.

The thickness of the optical functional layer is preferably in the range of 1.0 to 12.0 μm, more preferably in the range of 2.0 to 11.0 μm, and particularly preferably in the range of 3.0 to 10.0 μm. When the optical functional layer is thinner than 1.0 μm, curing failure is likely to occur due to inhibition of oxygen during ultraviolet curing, and scratch resistance of the optical functional layer is likely to deteriorate. When the optical functional layer is thicker than 12.0 μm, curling occurs due to curing shrinkage of the optical functional layer, microcracking occurs, adhesion to the light-transmitting substrate is lowered, and light transmittance is further lowered. In addition, as the film thickness increases, the amount of coating material required also increases, which also becomes a cause of cost increase.

<surface resistivity>

The surface resistivity of the optical layered body measured on the surface of the optical functional layer needs to be 1.0 × 10 ¹² Ω/□ or less. If it exceeds 1.0 × 10 ¹² Ω / □, sufficient antistatic properties may not be obtained. The surface resistivity is preferably 1.0 × 10 ¹² Ω / □ to 1.0 × 10 ¹⁰ Ω / □, and the range is electrostatically charged but immediately attenuated, and more preferably 1.0 × 10 ¹⁰ Ω / □ or less with less charge. It is particularly preferably 1.0 × 10 ⁹ Ω / □ or less. The lower limit is not limited and is, for example, 1.0 × 10 ⁶ Ω/□ or more. When the optical layered body is mounted on a PVA (Patterned Vertical Alignment) liquid crystal, the surface resistivity needs to be 1.0 × 10 ¹⁰ Ω/□ or less. If the value is exceeded, an image display failure such as liquid crystal inversion due to static electricity on the surface of the display occurs.

The surface resistivity of the optical laminate after saponification treatment needs to be 1.0 × 10 ¹² Ω/□ or less. If it exceeds 1.0 × 10 ¹² Ω / □, sufficient antistatic properties may not be obtained. When the surface resistivity is in the range of 1.0 × 10 ¹² Ω / □ to 1.0 × 10 ¹⁰ Ω / □, it exhibits the property of being attenuated immediately with static electricity, and preferably 1.0 × 10 ¹⁰ Ω / □ with less charge. the following. The lower limit is not limited and is, for example, 1.0 × 10 ⁶ Ω / □ or more.

<saturated charged voltage>

Preferably, the optical layered body has a saturated charging voltage of 1.5 kV or less at the outermost surface. In order to make the saturated charging voltage 1.5 kV or less, it can be achieved by adding a conductive material exhibiting good conductivity to the optical function layer or increasing the addition amount of the conductive material. The saturated charging voltage is related to the surface resistivity, and the lower the surface resistivity, the lower the saturated charging voltage. When the above saturated charging voltage exceeds 1.5 kV, especially in the IPS mode liquid crystal display, since a potential is applied between the electrodes arranged in the horizontal direction, the display may be easily distorted due to charging of the surface of the liquid crystal display. The above saturated charging voltage is more preferably 1.0 kV or less, and particularly preferably 0.5 kV or less. The lower limit is not particularly limited and is, for example, 0.01 kV.

The above saturated charging voltage can be measured in accordance with JIS L1094, and a half-life measuring method can be cited. The above-described half-life measurement method can be carried out by using a static decay tester (STATIC HONESTMETER) H-0110 (manufactured by Shihito Electrostatic Gas Co., Ltd., measuring conditions: applied voltage: 10 kV, distance: 20 mm, 25 ° C, 40% RH). The device is measured.

As a specific measurement method, for example, a sample (4 cm × 4 cm) is fixed to a turntable and rotated, and a voltage is applied thereto, and the withstand voltage value (kV) of the surface of the sample is measured by the above measuring device. By plotting the decay curve of withstand voltage versus time, it is possible to measure the half-life (time when the amount of charge reaches half of the initial value) and the saturated charging voltage.

<Light resistance>

An optical layering system for an optical functional layer provided with an antiglare layer or a hard coat layer for a display is intended to be used outdoors and is required to have light resistance. The test for light resistance has a method of naturally exposing under sunlight, but it takes a long time before the deterioration occurs. Therefore, an acceleration test for irradiating artificial light is usually performed. In the accelerated test, a carbon arc type light resistance tester using a ultraviolet carbon arc lamp as a light source can be used. The test conditions using the carbon arc type light resistance tester are defined by JIS K 5600-7-5, and in the present specification, values measured based on the test conditions are used.

By the ultraviolet rays emitted from the light resistance tester, the optical functional layer provided on the light-transmitting substrate may be deteriorated in characteristics due to structural changes such as breakage of the molecular chain. Therefore, the optical functional layer and the optical laminate which are laminated on the light-transmitting substrate are required to have light resistance, and in particular, it is required to reduce the deterioration of the antistatic property due to the light resistance test.

<Haze>

The optical laminate of the preferred embodiment of the present invention preferably has a total haze of from 3 to 13, more preferably from 4 to 10.5, particularly preferably from 5 to 9.

<Full light transmittance>

The total light transmittance of the optical layered body is preferably 90% or more, more preferably 90.5% or more, and particularly preferably 91% or more.

<Image sharpness>

With respect to the image sharpness of the optical laminate before the saponification treatment, it is based on a width of 0.5 mm, preferably from 0 to 80%, more preferably from 10 to 77.5%, particularly preferably from 20 to 75%.

<blinking>

In the case of the scintillation of the optical layered body, the surface opposite to the surface of the optical layered body is bonded to the surface of several liquid crystal displays having different resolutions via a colorless and transparent adhesive layer, and photographed by a CCD camera, according to Whether the image has a height deviation or not is judged. In terms of flicker, it is preferable to confirm with a display having a higher resolution, and it is preferable that there is no flicker in a liquid crystal display having a resolution of 101 to 140 ppi.

<average tilt angle>

The optical layered body of the present invention has a fine uneven shape on the surface of the optical functional layer. Here, the fine uneven shape is preferably such that the average tilt angle calculated from the average tilt obtained from ASME 95 is in the range of 0.2 to 1.4, more preferably 0.25 to 1.2, and particularly preferably 0.25 to 1.0. If the average tilt angle is less than 0.2, the anti-glare property is deteriorated, and if the average tilt angle exceeds 1.4, the contrast is deteriorated, and therefore, it is not suitable for an optical layered body for use in a display surface.

<surface roughness>

Further, in the optical layered body of the present invention, as the fine uneven shape of the optical functional layer, the surface roughness Ra is preferably from 0.05 to 0.2 μm, more preferably from 0.05 to 0.15 μm, particularly preferably from 0.05 to 0.10 μm. When the surface roughness Ra is less than 0.05 μm, the antiglare property of the optical laminate is insufficient. When the surface roughness Ra exceeds 0.2 μm, the contrast of the optical laminate is deteriorated.

<contact angle>

The contact angle of the optical layered body to water before the saponification treatment is preferably 100 or more, more preferably 105 or more. The upper limit is not particularly limited, and is, for example, 150 or less. The contact angle of the optical layered body to water after saponification is preferably 90 or more, more preferably 95 or more. The upper limit is not particularly limited and is, for example, 150 or less.

<Antifouling>

The antifouling property can be evaluated by the ease of wiping of the ink when scribing with an oil-based pen (trade name: McKee (registered trademark), manufactured by ZEBRA) on the optical functional layer. According to the method of wiping with a dust-free cloth (product number: FF-390C Kuraray Kuraflex Co., Ltd.), the better the antifouling property, the easier it is to wipe. It is preferable to completely wipe the cleaned laminate after reciprocating wiping 20 times with a load of 500 g/cm ² .

<Macbeth concentration>

In the optical layered product of the present invention, the value measured by the Macbeth reflection density is darker as the value measured in a state where the surface of the light-transmitting substrate of the optical film opposite to the resin layer is blackened. The value of the Macbeth reflection concentration is preferably 3.2 or more. When an optical film is used on the surface of a display or the like, a large difference is rarely seen in the white display. Therefore, in order to increase the contrast, it is necessary to emphasize the blackness at the time of black display. If the Macbeth reflection concentration is less than 3.2, the high contrast is insufficient.

<gloss>

The 60° gloss of the optical layered body of the present invention is preferably in the range of 100 to 130. When the 60° gloss is more than 130, the anti-glare property is lowered, so that it is not expected. Further, when the 60° glossiness is less than 100, although the anti-glare property is good, the scattering of light on the surface is enhanced, and the bright room contrast is lowered, so that it is not expected.

<Method of Manufacturing Optical Laminate>

As a method of applying a coating material for forming an optical functional layer on a light-transmitting substrate, a usual coating method or printing method can be applied. Specifically, air knife coating, bar coating, blade coating, blade coating, reverse coating, transfer roller coating, gravure coating, contact coating, cast coating, spray coating, slit nozzle coating, curtain coating, Coating such as dam coating, dip coating, die coating, gravure printing such as gravure printing, and printing such as stencil printing such as screen printing.

(Example)

Hereinafter, the invention will be described by way of examples, but the invention is not limited to the examples.

(Production Example 1) Production of synthetic smectite

4 L of water was added to a 10 L beaker to dissolve 860 g of No. 3 water glass (SiO ₂ 28%, Na ₂ O 9%, Mo Er ratio 3.22), and 162 g of 95% sulfuric acid was added at a time with stirring to obtain a phthalate solution. . Next, 560 g of MgCl ₂ ‧6H ₂ O excellent pure reagent (purity: 98%) was dissolved in 1 L of water, and this was added to the above-mentioned citric acid solution to prepare a homogeneous mixed solution. This was added dropwise to 3.6 L of a 2N-NaOH solution over 5 minutes while stirring. The obtained reaction precipitate was immediately subjected to a lateral flow filtration system manufactured by Nippon Insulator Co., Ltd. [transverse flow filter (ceramic membrane filter: pore size 2 μm, tube type, filtration area 400 cm ² ), pressurization: 2 kg/ Cm ² , filter cloth: tetoron 1310] After filtration and thorough water washing, a solution consisting of 200 ml of water and 14.5 g of Li(OH)‧H ₂ O was added to make a slurry. This was transferred to an autoclave, and hydrothermally reacted at 41 kg/cm ² at 250 ° C for 3 hours. After cooling, the reactant was taken out, dried at 80 ° C and pulverized to obtain a synthetic smectite of the following formula. The synthesis of the smectite was carried out, and as a result, a compound having the following composition was obtained. Na _0.4 Mg _2.6 Li _0.4 Si ₄ O ₁₀ (OH) ₂ . Further, the cation exchange capacity measured by the methylene blue adsorption method was 110 meq/100 g.

(Production Example 2) Production of Synthetic Montmorillonite Layered Organic Clay A

20 g of synthetic smectite synthesized in Production Example 1 was dispersed in 1000 ml of tap water to prepare a suspension. 500 ml of an aqueous solution of a quaternary ammonium salt (98% content product) of the following formula (II) in an amount equivalent to 1.00 times the cation exchange capacity of the synthetic smectite is added to the synthetic smectite suspension. The reaction was carried out for 2 hours at room temperature with stirring. The product is subjected to solid-liquid separation and washing to remove by-product salts, and then dried to obtain a synthetic smectite-based layered organic clay A.

(Production Example 3) Synthesis of ionizing radiation-curable fluorinated acrylate B liquid

In a 500 ml reaction flask, to a solution of 22.2 g (0.1 mol) of isophorone diisocyanate in 100 ml of MIBK (methyl isobutyl ketone), pentaerythritol triacrylate was added dropwise at 25 ° C while bubbling air. 59.6 g (0.20 mol) of MIBK 50 ml solution. After the completion of the dropwise addition, 0.3 g of dibutyltin dilaurate was added, and the mixture was further heated and stirred at 70 ° C for 4 hours. After the reaction was completed, the reaction solution was washed with 100 ml of 5% hydrochloric acid. After separating the organic layer, the solvent was distilled off under reduced pressure at 40 ° C or less to obtain 80.5 g of a colorless transparent viscous liquid urethane acrylate. 40.8 g (0.05 mol) of prepared urethane acrylate, 71.9 g (0.15 mol) of perfluorooctylethyl thiol, and 60 g of MIBK were placed in a 200 ml reaction flask to homogenize. 1.0 g of triethylamine was slowly added to the mixed solution at 25 °C. After the end of the addition, the mixture was further stirred at 50 ° C for 3 hours. After completion of the reaction, triethylamine was distilled off under reduced pressure at 50 ° C or lower, and triethylamine was distilled off under reduced pressure, and further dried with a vacuum pump to obtain an ionizing radiation-curable fluorinated acrylate B solution composed of a mixture containing the mixture. The fluorinated alkyl group-containing urethane acrylate represented by Structural Formula 1 further contains a compound different from the above Structural Formula 1 in the addition reaction of propylene fluorenyl group and perfluorooctyl ethyl thiol.

Structural formula 1

Molecular weight: 2259

Fluorine atom content: 42.9%

(Production Example 4) Synthesis of polystyrenesulfonic acid

206 g of sodium styrene sulfonate was dissolved in 1000 ml of ion-exchanged water, stirred at 80 ° C, and an oxidizing agent solution (1.14 g of ammonium persulfate previously dissolved in 10 ml of water) was added dropwise for 20 minutes, and the solution was stirred for 12 hours. Add 1000 ml of sulfuric acid diluted to 10% by mass to the obtained sodium styrene sulfonate-containing solution, remove about 1000 ml of the solution containing the polystyrenesulfonic acid solution by ultrafiltration, and add 2000 ml of ion-exchanged water to the residue. Approximately 2000 ml of the solution was removed by ultrafiltration. The above ultrafiltration operation was repeated 3 times. Further, about 2000 ml of ion-exchanged water was added to the obtained filtrate, and about 2000 ml of the solution was removed by ultrafiltration. This ultrafiltration operation was repeated 3 times. The water in the obtained solution was removed under reduced pressure to obtain a solid of colorless polystyrenesulfonic acid.

(Production Example 5) Synthesis of poly(3,4-ethylenedioxythiophene) (PPS-PEDOT) doped with polystyrenesulfonic acid

36.7 g of the polystyrenesulfonic acid synthesized in Production Example 4 was dissolved in 2000 ml of ion-exchanged water, and the resulting solution was mixed with 14.2 g of 3,4-ethylenedioxythiophene at 20 °C. The mixed solution thus obtained was kept at 20 ° C, and while slowly stirring, the oxidation catalyst solution was added, and the reaction was carried out by stirring for 3 hours. The oxidation catalyst solution was prepared by dissolving 29.64 g of ammonium persulfate and 8.0 g of iron sulfate in 200 ml. Ion exchange water derived. 2000 ml of ion-exchanged water was added to the obtained reaction liquid, and about 2000 ml of the solution was removed by ultrafiltration. This operation was repeated 3 times. Then, 200 ml of sulfuric acid diluted to 10% by mass and 2000 ml of ion-exchanged water were added to the obtained solution, about 2000 ml of the solution was removed by ultrafiltration, 2000 ml of ion-exchanged water was added thereto, and about 2000 ml was removed by ultrafiltration. The solution. This operation was repeated 3 times. Further, 2000 ml of ion-exchanged water was added to the obtained solution, and about 2000 ml of the solution was removed by ultrafiltration. This operation was repeated 5 times to obtain 1.5% by mass of a blue aqueous solution of poly(3,4-ethylenedioxythiophene) (PPS-PEDOT) doped with polystyrenesulfonic acid.

(Manufacturing Example 6) Poly(3,4-ethylenedioxythiophene) doped with polystyrenesulfonic acid (PPS-PEDOT) made of isopropanol dispersion C

100 g of a 1.5% by mass aqueous dispersion of poly(3,4-ethylenedioxythiophene) (PPS-PEDOT) doped with polystyrenesulfonic acid synthesized in Production Example 5 was placed in a flask, and isopropylidene was added thereto. 100 g of alcohol was added with 0.5 ml of 10% hydrochloric acid while stirring. Then, after stirring for 30 minutes, it was allowed to stand for 1 hour. The obtained gel was filtered under reduced pressure using a glass filter, and then 200 g of isopropyl alcohol was added, and the pressure filtration operation was repeated 8 times. The solid component was taken out from the glass filter while the solid content was not completely dried, and the mass of the solid component was calculated from the decrease in the heating mass to obtain 15 g of a wet blue solid having a solid content of 7.8%. 15 g of isopropyl alcohol was placed in a beaker, and 0.4 g of an amine alkylene oxide adduct (trade name: Ethomeen C/15, manufactured by LION AKZO Co., Ltd.) was added, and then 15 g of the obtained wet blue solid was added, and an emulsification disperser was used. (trade name: TK homogenizer, manufactured by a special machine industry), and treated with a rotation number of 4000 rpm for 10 minutes to obtain a PSS-PEDOT isopropyl alcohol dispersion (liquid C) (solid content concentration 5%, water content 20% or less) .

Using the Nanotrac particle size distribution measuring apparatus UPA-EX150 (manufactured by Nikkiso Co., Ltd.), the obtained PSS-PEDOT isopropyl alcohol dispersion (solid content concentration 5%, water content 20% or less) was obtained by a monodisperse mode. The average particle size was measured. Here, the average particle diameter (d50) was 20 nm, and d90 was 40 nm.

(Production Example 7) Production Example of Copolymer D Containing a Quaternary Ammonium Salt Group

In a flask equipped with a stirring device, a nitrogen gas introduction tube, a thermometer, and a reflux condenser, 40 g of n-butyl methacrylate, 50 g of LIGHT-ESTER DQ-100 (manufactured by Kyoei Chemical Co., Ltd.), and N, N-methacrylate were fed. 5 g of dimethylaminoethyl ester, 5 g of acryl, 60 g of methanol, and 60 g of methyl cellosolve were stirred for 30 minutes while introducing nitrogen gas into the flask, and the contents of the flask were heated to 75 ° C. Next, 0.5 g of AIBN (azobisisobutyronitrile) was added to the flask. While maintaining the contents of the flask at 75 ° C, 0.5 g of AIBN was added twice per hour. After 9 hours from the initial addition of AIBN, it was cooled to room temperature to obtain a quaternary ammonium salt group-containing copolymer D liquid having a polymer concentration of 45%. The obtained copolymer was measured by GPC, and as a result, the mass average molecular weight was 100,000. Further, the SP value of the polymer was measured and found to be 12.15.

[Example 1]

The predetermined mixture described in Table 1 containing the layered organic clay A, the ionizing radiation-curable fluorinated acrylate B liquid, and the PSS-PEDOT isopropyl alcohol dispersion liquid C was stirred by a disperser for 30 minutes. A coating for forming an optical functional layer, which was applied by a roll coating method (linear velocity: 20 m/min) to a TAC film (manufactured by Fujifilm Co., Ltd., TD80UL) having a transparent substrate having a film thickness of 80 μm and a total light transmittance of 92%. The surface was dried at 30 to 50 ° C for 20 seconds, dried at 100 ° C for 1 minute, and irradiated with ultraviolet light in a nitrogen atmosphere (nitrogen replacement). (Light: concentrating high-pressure mercury lamp, output of the lamp: 120 W/cm, number of lamps: 4 Å, irradiation distance: 20 cm), thereby curing the coating film. Thus, an optical layered body of Example 1 having an optical functional layer having a thickness of 5.5 μm was obtained.

[Embodiment 2]

An optical layered body of Example 2 having an optical functional layer having a thickness of 5.8 μm was obtained in the same manner as in Example 1 except that the coating material for forming an optical function layer was changed to the predetermined mixed liquid described in Table 1.

[Comparative Example 1]

An optical function having a thickness of 4.0 μm was obtained in the same manner as in Example 1 except that the coating material for forming an optical function layer was changed to a predetermined mixed liquid of the first embodiment, which contained the quaternary ammonium salt-based copolymer D liquid. The optical laminate of Comparative Example 1 of the layer.

[Comparative Example 2]

An optical example of Comparative Example 2 having an optical functional layer having a thickness of 5.6 μm was obtained in the same manner as in Example 1 except that the coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 1 which does not contain a conductive material. Laminated body.

(Production Example 8) Synthesis of ionizing radiation-curable fluorinated acrylate E solution

In a 500 ml reaction flask, to a solution of 22.2 g (0.1 mol) of MIBK (methyl isobutyl ketone) in 100 ml of isophorone diisocyanate, air-blown with pentaerythritol triacrylate at 25 ° C 59.6 g (0.20 mol) of MIBK 50 ml solution. After the completion of the dropwise addition, 0.3 g of dibutyltin dilaurate was added, and the mixture was further heated and stirred at 70 ° C for 4 hours. After the reaction was completed, the reaction solution was washed with 100 ml of 5% hydrochloric acid. After the organic layer was separated, the solvent was evaporated under reduced pressure at 40 ° C or less to obtain 80.5 g of a colorless transparent viscous liquid urethane acrylate. 40.8 g (0.05 mol) of prepared urethane acrylate, 42 g of perfluorobutyl ethyl mercaptan (0.15 mol), and 60 g of MIBK were placed in a 200 ml reaction flask to homogenize. 1.0 g of triethylamine was slowly added to the mixed solution at 25 °C. After the end of the addition, the mixture was further stirred at 50 ° C for 3 hours. After completion of the reaction, triethylamine was distilled off under reduced pressure at 50 ° C or lower, and triethylamine was distilled off under reduced pressure, and further dried with a vacuum pump to obtain an ionizing radiation-curable fluorinated acrylate E liquid composed of a mixture containing the mixture. The fluorinated alkyl group-containing urethane acrylate represented by Structural Formula 2 further contains a compound different from the above Structural Formula 2 in the addition reaction of propylene fluorenyl group and perfluorobutyl ethyl thiol.

Structural formula 2

Molecular weight: 1659

Fluorine atom content: 30.9%

(Production Example 9) Synthesis of ionizing radiation-curable fluorinated acrylate F solution

In a 500 ml flask equipped with a stirring device and a Dean-Stark trap, 150.0 g of perfluorohexylethyl mercaptan, 30.0 g of thiomalic acid, 1.5 g of concentrated sulfuric acid, and toluene were fed. 200 ml was heated and refluxed until the theoretical yield of water (7.1 g) was removed. After cooling to 60 ° C, 20 g of slaked lime was added, and the mixture was stirred at the same temperature for 30 minutes. After filtration, toluene was distilled off under reduced pressure to obtain 168.0 g of bis(perfluorohexylethyl) thiomalate as a yellow transparent viscous liquid.

In a 200 ml reaction flask, pentaerythritol tetraacrylate (ARONIX M-450, manufactured by Toagosei Co., Ltd.), 17.6 g (0.05 mol), bis(perfluorohexylethyl) thiomalate, 43.7 g (0.05 mol) was charged. Ear), 10 g of ethyl acetate, while stirring at 50 ° C, 1.0 g of triethylamine was slowly added. After the end of the addition, the mixture was further stirred at 50 ° C for 3 hours. After the completion of the reaction, ethyl acetate and triethylamine are distilled off under reduced pressure at 50 ° C or lower, and then further dried by a vacuum pump to obtain a fluorine-containing alkyl acrylate F liquid represented by the following structural formula 3. 25.0g.

Structural formula 3

Molecular weight: 1162

Fluorine atom content: 42.5%

(Production Example 10) Synthesis of fluorine-based surfactant G liquid

In a glass flask equipped with a stirring device, a condenser, and a thermometer, 19 parts by weight of a fluorine-containing alkyl (meth) acrylate monomer (Structure 4) and an ethylenic unsaturated group having a branched aliphatic hydrocarbon group are fed. 30 parts by weight of a monomer (Structure 5), 39 parts by weight of a monoacrylate compound of a copolymer of ethylene oxide and propylene oxide having a molecular weight of 400 in a side chain, and methacrylate at both ends of tetraethylene glycol 4 parts by weight of the compound, 8 parts by weight of methyl methacrylate, and 350 parts by weight of isopropyl alcohol (hereinafter abbreviated as IPA), and azobisisodin as a polymerization initiator was added under reflux in a nitrogen stream. After 1 part by weight of nitrile (hereinafter abbreviated as AIBN) and 10 parts by weight of lauryl mercaptan as a chain transfer agent, the mixture was refluxed at 85 ° C for 7 hours to complete polymerization to obtain a fluorine-containing oligomer. The molecular weight of the polymer obtained by gel permeation chromatography (hereinafter abbreviated as GPC) polystyrene conversion was Mn = 5,500. The fluorine atom content was 11.8%. This copolymer is a fluorine-based surfactant G liquid.

Structural formula 4

CH ₂ =CHCOOCH ₂ CH ₂ C ₈ F ₁₇

Structural formula 5

(Production Example 11) Synthesis of ATO-containing UV-curable resin H liquid

A mixed solution in which 130 g of potassium stannate and 30 g of bismuth potassium tartrate were dissolved in 400 g of pure water was prepared. After the mixture was allowed to stand at 60 ° C for 12 hours, the prepared solution was added to 1000 g of pure water in which 1.0 g of ammonium nitrate and 12 g of 15% aqueous ammonia were dissolved under stirring to carry out hydrolysis. At this time, a 10% nitric acid solution was simultaneously added to maintain the pH at 9.0. The precipitate formed by washing and washing was again dispersed in water to prepare a metal oxide precursor hydroxide dispersion having a solid concentration of 20% by weight. The dispersion was spray-dried at a temperature of 100 ° C to prepare a metal oxide precursor hydroxide powder. The powder was heat-treated at 550 ° C for 2 hours in an air atmosphere to obtain Sb-doped tin oxide (ATO) powder.

60 g of this powder was dispersed in 140 g of a 4.3 wt% potassium hydroxide aqueous solution, and the dispersion was kept at 30 ° C while being pulverized by a sand mill for 3 hours to prepare a sol. Next, the sol was subjected to de-ionization treatment with an ion exchange resin until the pH reached 3.0, and then pure water was added to prepare an ATO dispersion having a solid concentration of 20% by weight. The ATO dispersion had a pH of 3.3. Further, the average particle diameter of the ATO fine particles was 10 nm.

Next, 100 g of the ATO dispersion liquid was adjusted to 25 ° C, and tetraethoxy decane (manufactured by Tama Chemical Co., Ltd.: ethyl decanoate, SiO ₂ concentration: 28.8% by weight) 4.0 g was added for 3 minutes, and then stirred for 30 minutes. . Thereafter, 100 g of ethanol was added for 1 minute, and the temperature was raised to 50 ° C over 30 minutes, followed by heat treatment for 15 hours. The solid content concentration at this time was 10% by weight.

Subsequently, the water and ethanol as a dispersion medium were replaced with ethanol by filtration through an ultrafiltration membrane to prepare an ATO dispersion liquid which was subjected to surface treatment with an organic cerium compound at a solid concentration of 30% by weight.

13.1 g of the ATO dispersion liquid which was subjected to the surface treatment with the organic cerium compound, 25.6 g of pentaerythritol triacrylate (PE-3A manufactured by Kyoeisha Chemical Co., Ltd.), and urethane acrylate (UA306I manufactured by Kyoeisha Chemical Co., Ltd.) 17.1 g, photopolymerization initiator (Irgacure 184 manufactured by Ciba Specialty Chemicals) 2.5 g, ethanol 34.2 g, and toluene 7.5 g were mixed and mixed with a paint shaker for 30 minutes to obtain ATO-containing ultraviolet curing having a solid concentration of 49% by weight. Type resin H liquid.

[Example 3]

The predetermined mixture described in Table 2 containing the ionizing radiation-curable fluorinated acrylate B liquid and the ATO ultraviolet-curable resin H liquid was stirred by a disperser for 30 minutes to obtain a coating material for forming an optical functional layer. The coating was applied by roll coating (linear velocity: 20 m/min) in film thickness A TAC film of a transparent substrate of 80 μm and a total light transmittance of 92% (manufactured by Fujifilm Co., Ltd., TD80UL) was dried at 100 ° C for 1 minute on a single surface at 30 to 50 ° C for 20 minutes. In the environment (nitrogen replacement), ultraviolet irradiation (light: concentrating high-pressure mercury lamp, output of lamp: 120 W/cm, number of lamps: 4 Å, irradiation distance: 20 cm) was carried out, whereby the coating film was cured. Thus, an optical layered body of Example 3 having an optical functional layer having a thickness of 7.3 μm was obtained.

[Example 4]

The same procedure as in Example 3 except that the coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 2 containing the ionizing radiation-curable fluorinated acrylate B liquid and the ATO ultraviolet curable resin H liquid. The optical laminate of Example 4 having an optical functional layer having a thickness of 7.2 μm was obtained.

[Example 5]

The same procedure as in Example 3 except that the coating material for forming an optical function layer was changed to the predetermined mixed liquid described in Table 2 containing the ionizing radiation-curable fluorinated acrylate E liquid and the ATO ultraviolet curable resin H liquid. The optical laminate of Example 5 having an optical functional layer having a thickness of 7.3 μm was obtained.

[Embodiment 6]

The same procedure as in Example 3 except that the coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 2 containing the ionizing radiation-curable fluorinated acrylate F liquid and the ATO ultraviolet curable resin H liquid. The optical laminate of Example 6 having an optical functional layer having a thickness of 7.2 μm was obtained.

[Comparative Example 3]

The coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 2 containing LINC-3A manufactured by Kyoei Chemical Co., Ltd., which is an ionizing radiation-curable fluorinated acrylate, and a liquid containing ATO ultraviolet curable resin H. An optical layered product of Comparative Example 3 having an optical functional layer having a thickness of 7.2 μm was obtained in the same manner as in Example 3 except the above. The structural formula of LICN-3A is as follows. LICN-3A is a mixture of Structural Formula 6 and Structural Formula 7, (Structure 6): (Structure 7) = 65:35 (weight ratio).

Structural formula 6

Tripropylene decyl heptafluorononyl pentaerythritol

Molecular weight: 728

Fluorine atom content: 44.3%

Structural formula 7

Pentaerythritol tetraacrylate [Comparative Example 4]

The coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 2 containing a fluorine-based surfactant G liquid as a non-ionizing radiation-curable fluorinated acrylate and a liquid containing ATO ultraviolet-curable resin H. Other than the above, an optical layered product of Comparative Example 4 having an optical functional layer having a thickness of 7.3 μm was obtained in the same manner as in Example 3.

[Comparative Example 5]

The coating material for optical function layer formation is changed to 2-(perfluorooctyl)-ethyl acrylate (trade name: LIGHT-ACRYLATE FA-108, manufactured by Kyoeisha Chemical Co., Ltd.) containing ionizing radiation-curable fluorinated acrylate. An optical layered product of Comparative Example 5 having an optical functional layer having a thickness of 7.4 μm was obtained in the same manner as in Example 3 except that the predetermined mixture liquid of the ATO ultraviolet curable resin H liquid was used. The structural formula of 2-(perfluorooctyl)-ethyl acrylate is as follows (Structure 8).

Structural formula 8

H ₂ C=CHCOOCH ₂ CH ₂ C ₈ F ₁₇

Molecular weight: 518

Fluorine atom content: 62.4%

[Comparative Example 6]

The same procedure as in Example 3 was carried out, except that the coating material for forming an optical function layer was changed to a predetermined mixed liquid described in Table 2, which contained the fluorinated acrylate containing the ionizing radiation-curable acrylate but containing the ATO ultraviolet curable resin H liquid. The optical laminate of Comparative Example 6 having an optical functional layer having a thickness of 7.3 μm was obtained.

[Comparative Example 7]

The coating liquid for optical function layer formation was changed to a predetermined mixed liquid described in Table 2 containing the ionizing radiation-curable fluorinated acrylate B liquid and the quaternary ammonium salt-based copolymer D liquid, and the examples and examples were also given. The optical laminate of Comparative Example 7 having an optical functional layer having a thickness of 7.3 μm was obtained in the same manner.

[Comparative Example 8]

A coating having a thickness of 7.3 μm was obtained in the same manner as in Example 3 except that the coating material for forming an optical function layer was changed to the predetermined mixed liquid described in Table 2 containing the ionizing radiation-curable fluorinated acrylate B liquid. The optical layered body of Comparative Example 8 of the optical functional layer.

<Evaluation method>

Next, the following items were evaluated for the optical laminates of the examples and the comparative examples.

(saponification treatment)

The saponification treatment of the optical laminate was carried out in the following procedure. The contact angle of the surface of the TAC film constituting the optical layered product with respect to water was measured. As a result, the layered body having a thickness of 55° or more before the saponification treatment was 20° or less after the saponification treatment. Therefore, it was confirmed that the saponification treatment was appropriately performed.

(1) immersed in a 6% sodium hydroxide aqueous solution at 55 ° C for 2 minutes

(2) Wash for 30 seconds

(3) 35 ° C, 0.1 equivalent of sulfuric acid immersed for 30 seconds

(4) Wash for 30 seconds

(5) 120 ° C, hot air drying for 1 minute

The surface resistivity (R1) at the initial stage (the stage where the saponification treatment and the weather resistance test were not performed) and the surface resistivity (R3) after the saponification treatment were measured for each of the optical layered bodies obtained above. Here, the number of R3/R1 less than 10 is ○, and the number of 10 or more is ×.

(light resistance test)

The light resistance test was carried out under the following conditions.

Testing machine: carbon arc type light resistance tester (light resistance tester manufactured by Suga test machine)

Product Name: "UV Auto Fade Meter U48AU-B"

Test conditions: blackboard temperature 50 ± 5 ° C

Irradiance: 500 W/m ² (measurement wavelength range 300 to 700 nm)

Irradiation time: 80 hours

With respect to the optical layered body obtained above, the surface resistivity (R1) at the initial stage (the stage where the saponification treatment and the weather resistance test were not performed) and the surface resistivity (R2) after the carbon arc type light resistance test were measured. When R2/R1 is 10 ⁴ or less, it is ○, and when it is more than 10 ⁴ , it is ×. In addition, the surface resistivity (R1) at the initial stage (the stage where the saponification treatment and the weather resistance test was not performed), the saponification treatment, and the surface resistivity (R4) after the carbon arc light resistance test were measured for the optical layered body obtained above. When R4/R1 is 10 ⁴ or less, it is ○, and if it is more than 10 ⁴ , it is ×.

(total light transmittance) The total light transmittance was measured by a haze meter (trade name: NDH2000, manufactured by Nippon Denshoku Co., Ltd.) in accordance with JIS K7105. (haze value)

The haze value was measured by a haze meter (trade name: NDH2000, manufactured by Nippon Denshoku Co., Ltd.) in accordance with JIS K7105. The haze in the table is the value of full haze.

(average spacing of surface roughness and unevenness)

The surface roughness Ra and the average interval Sm of the unevenness were measured by a surface roughness measuring instrument (trade name: Surfcorder SE1700α, manufactured by Kosaka Research Co., Ltd.) in accordance with JIS B0601-1994.

(average tilt angle)

The average tilt angle was calculated from the ASME 95 using a surface roughness measuring device (trade name: Surfcorder SE1700α, manufactured by Kosaka Research Co., Ltd.), and the average tilt angle was calculated from the following equation.

Average tilt angle = tan ^-1 (average tilt)

(image sharpness)

According to JIS K7105, a measuring instrument (trade name: ICM-1DP, manufactured by Suga Test Instruments Co., Ltd.) was used, and the measuring device was set to a transmissive mode, and measurement was performed using a light comb having a width of 0.5 mm.

(anti-glare)

The anti-glare property is set to ○ when the value of image sharpness is 0 to 80, and is set to × when it is 81 to 100.

(surface resistivity)

The surface resistivity was measured in accordance with JIS K6911 using a high resistivity meter (trade name: Hiresta-UP, manufactured by Mitsubishi Chemical Corporation). The measurement was carried out under the conditions of 20 ° C and 65% RH after the sample was conditioned for 1 hour at 20 ° C and 65% RH. The surface resistivity was measured from the surface side of the optical functional layer of the optical layered body under the conditions of a voltage of 250 V and an application time of 10 seconds.

When it is 1.0×10 ⁹ Ω/□ or less, it is ◎, when it is more than 1.0×10 ⁹ Ω/□, and when it is 1.0×10 ¹⁰ Ω/□ or less, it is ○, and when it is 1.0×10 ¹⁰ Ω/□ or less, it is more than 1.0×10 ¹⁰ Ω/□ and at 1.0×10. ^{When it is 12} Ω/□ or less, it is △, and when it is more than 1.0×10 ¹² Ω/□, it is ×.

(saturated charged voltage)

The saturated charging voltage was measured in accordance with JIS L1094 under the conditions of a voltage of 10 kV, a distance of 20 mm, 25 ° C, and 40% RH using an electrostatic decay tester H-0110 (manufactured by Nishito Electric Co., Ltd.).

(scratch resistance)

The steel wool #0000 manufactured by Nippon Steel Wool Co., Ltd. was attached to an abrasion resistance tester (Abrasion Tester, Model: 339, manufactured by Fu Chien Co., Ltd.), and the optical functional layer was reciprocally wiped 10 times with a load of 250 g/cm ² . Then, the scratch on the worn portion is confirmed under the fluorescent lamp. When the number of scars is 0, it is ◎, when the number of scars is 1 or more and less than 10, it is ○, the number of scars is 10 or more, and when it is less than 30, it is Δ, and when the number of scars is 30 or more, it is ×.

(light room contrast)

In the optical laminate of the examples and the comparative examples, the optical layered body of the examples and the comparative examples was bonded to a liquid crystal display device (trade name: LC-37GX1W, via a colorless transparent adhesive layer). The illuminance of the surface of the liquid crystal display is 200 lux, which is obtained by a fluorescent lamp (trade name: HH4125GL, manufactured by National Corporation) in the direction of 60° from the front side of the liquid crystal display device screen. A color altimeter (trade name: BM-5A, manufactured by TOPCON Co., Ltd.) measures the height at which the liquid crystal display device is displayed in white and black, and the height of the obtained black display is obtained by the following formula ( Cd/m ² ) and the height (cd/m ² ) at the time of white display are calculated. When the calculated value is 800 or less, it is ×, and when it is 801 or more, it is ○.

Contrast = height of white display / height of black display

(dark room contrast)

In the optical laminate of the examples and the comparative examples, the optical layered body of the examples and the comparative examples was bonded to the liquid crystal display device via a colorless transparent adhesive layer on the opposite side to the surface on which the optical functional layer was formed (trade name: LC-37GX1W, Sharp) The surface of the screen manufactured by the company is measured by a color altimeter (trade name: BM-5A, manufactured by Topcon) under the conditions of a dark room, and the height of the liquid crystal display device is displayed in white and black. height height (cd / m ²⁾ white display and black display is obtained (cd / m ²⁾ is calculated, when the case is set to 900 to 1100 × calculated, is set to 1101 to 1300 △ is ○ when it is 1301 to 1500.

Contrast = height of white display / height of black display

The results obtained in Examples 1 to 2 and Comparative Examples 1 to 2 are shown in Tables 3 and 4.

As described above, according to the present invention, it is possible to provide an optical layered body, a polarizing plate, and a display device using the optical layered body which have excellent antistatic properties and are excellent in saponification resistance, light resistance, and scratch resistance.

For Examples 3 to 6 and Comparative Examples 3 to 8, the following evaluations were performed in addition to the foregoing evaluations.

(Contact angle)

The contact angle of the surface of the optical functional layer with respect to water was measured. Next, the contact angle of the surface of the saponified optical functional layer with water was measured. The contact angle of water was measured by a contact angle meter (trade name: Eruma G-1 contact angle meter, manufactured by Eruma Co., Ltd.) in accordance with JIS R3257 (Test method for wettability of substrate glass surface).

(flicker)

With respect to the scintillation, the opposite surface of the optical laminate forming surface of each of the examples and the comparative examples was bonded to a liquid crystal display having a resolution of 50 ppi via a colorless and transparent adhesive layer (trade name: LC-32GD4, manufactured by Sharp Corporation). ), a liquid crystal display having a resolution of 100 ppi (trade name: LL-T1620-B, manufactured by Sharp Corporation), a liquid crystal display having a resolution of 120 ppi (trade name: LC-37GX1W, manufactured by Sharp Corporation), and a liquid crystal having a resolution of 140 ppi Display (product name: VGN-TX72B, manufactured by Sony Corporation), liquid crystal display with a resolution of 150 ppi (trade name: nw8240-PM780, manufactured by HP (Hewlett-Packard), Japan), and liquid crystal display with a resolution of 200 ppi (trade name) : PC-CV50FW, manufactured by Sharp Corporation), the liquid crystal display is displayed in green under the dark room, and then a CCD camera (CV-200C, Keyence (CV-200C) with a resolution of 200 ppi from the normal direction of each liquid crystal TV. In the image obtained by KEYENCE), when the height of the deviation is not 0 to 50 ppi, the value is set to ×, when it is 51 to 100 ppi, it is set to Δ, and when it is 101 to 140 ppi, it is set to ○. 141 to 200 ppi Set ◎.

(Antifouling McKee (registered trademark) test)

On the optical functional layer of the optical laminate to be produced, a 3 cm long line was drawn with an oil-based pen (trade name: McKee (registered trademark), manufactured by ZEBRA), and left for 1 minute, by using a clean cloth (product number) : FF-390C Kuraray Kuraflex Co., Ltd.) The method of wiping was evaluated. After reciprocating wiping for 20 times with a load of 500 g/cm ² , it was set to ○ when it was completely wiped off, Δ when there was a portion that could not be wiped off, and was set to × when it was completely wiped off.

(Macbeth concentration)

Regarding the Macbeth reflection density, the optical layer of the examples and the comparative examples was carried out by Magic Ink (registered trademark) using a Macbeth reflection densitometer (trade name: RD-914, manufactured by SAKATA ENGINEERING) in accordance with JIS K7654. After the surface of the bulk translucent substrate on the opposite side to the resin layer was blackened, the Macbeth reflection density on the surface of the resin layer was measured.

(Gloss)

Regarding the glossiness, a 60° specular gloss was measured according to JIS Z8741 using a gloss meter (trade name: VG2000, manufactured by Nippon Denshoku Co., Ltd.).

The results obtained for Examples 3 to 6 and Comparative Examples 3 to 8 are shown in Table 5. The data in the table is the result of measurement of the optical layered body before the saponification treatment unless otherwise specified.

Table 6 shows the results of experiments involving light resistance of Examples 3 to 6 and Comparative Example 8.

As described above, according to the present invention, it is possible to provide an optical layered body having excellent antistatic properties, light resistance, and excellent saponification resistance, and a display device using the optical laminate.

1. . . Optical laminate

10. . . Light transmissive matrix

20. . . Optical function layer

twenty one. . . surface layer

Fig. 1 is a cross-sectional view of an optical laminate.

1. . . Optical laminate

10. . . Light transmissive matrix

20. . . Optical function layer

twenty one. . . surface layer

Claims (12)

An optical laminate which is provided with a layer of an optical functional layer directly on a light-transmitting substrate, the optical functional layer comprising at least an ionizing radiation-curable fluorinated acrylate and a conductive material, the surface of the optical laminate The surface resistivity after carbon arc type light resistance test is 1.0×10 ¹² Ω/□ or less, and the ratio of surface resistivity before and after carbon arc light resistance test (R2/R1; R1 is carbon arc light resistance test) The front surface resistivity, R2 is a surface resistivity after the carbon arc light resistance test, is 10 ⁴ or less. The optical laminate according to claim 1, wherein the saturated electrification voltage after the carbon arc type light resistance test is 1.5 kV or less. The optical layered body according to the first or second aspect of the invention, wherein the optical functional layer further comprises at least one of translucent fine particles or an inorganic component capable of forming irregularities by agglomeration. The optical layered body according to claim 1, wherein the conductive material is a conductive metal oxide, and the optical functional layer is to contain at least the ionizing radiation-curable fluorinated acrylate and the conductive metal oxide. The layer obtained by curing the composition, the ionizing radiation-curable fluorinated acrylate having a molecular weight of 1,000 or more and containing three or more acrylonitrile groups. The optical laminate according to claim 1 or 4, wherein the ionizing radiation-curable fluorinated acrylate contains a perfluoroalkyl group. The optical laminate according to claim 4, wherein the ionizing radiation-curable fluorinated acrylate has a fluorine atom content of 20%. the above. The optical layered body according to the first or fourth aspect of the invention, wherein the ionizing radiation-curable fluorinated acrylate is a compound represented by the following formula (A). Wherein Cy is a cycloalkyl moiety of a 5- or 6-membered ring in which a part of hydrogen is substituted by a substituent of the above formula and optionally substituted by a methyl group or an ethyl group, a is an integer of 1 to 3, and X is a methylene group or Directly bonded, R _F is a perfluoroalkyl group having 4 to 9 carbon atoms, and n is an integer of 1 to 3. When the a is 2 or more, the X, R _F and n are independently selected from each other. The optical layered body according to claim 1 or 4, wherein the ionizing radiation-curable fluorinated acrylate is a urethane acrylate. The optical laminate according to the first or second aspect of the invention, wherein the conductive material is a π-conjugated conductive polymer, and the optical functional layer comprises a π-conjugated conductive polymer and a polymer blend. A composite of impurities. The optical laminate according to the first or second aspect of the invention, wherein the surface resistivity after the saponification treatment is 1.0 × 10 ¹⁰ Ω / □ or less. A polarizing plate obtained by applying the optical laminated volume layer according to any one of claims 1 to 10 to a polarizing substrate. A display device having patent applications 1 to 10 The optical laminate according to any one of the preceding claims.