Optical laminate, article, and image display apparatus

Abstract

To provide an optical laminate, an article, and an image display device having excellent scratch resistance.SOLUTION: An optical laminate comprises a plastic film, a hard coat layer, an adhesion layer, a high refractive index layer composed of niobium pentoxide, a low refractive index layer composed of SiO2, and an antifouling layer laminated in this order, where the hard coat layer contains a filler and has a thickness of 3 μm or more and 25 μm or less; the surface of the optical laminate has a ten-point average roughness Rz of 19 nm or more and 100 nm or less; an apparent average particle diameter of aggregates of the filler, obtained by measuring the surface of the optical laminate with an atomic force microscope is 150 nm or more and 2200 nm or less; the antifouling layer contains a fluorine-based compound; both the high refractive index layer and the low refractive index layer are sputter films; and the antifouling layer is provided on the low refractive index layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical laminate, an article, and an image display device. [Background technology]

[0002] For example, an anti-reflection optical laminate is sometimes provided on the surface of a flat panel display (FPD), a touch panel, a solar cell, etc. In recent years, with the increase in the market for touch panels of smartphones and various operating devices, there has been a demand for improved scratch resistance of anti-reflection optical laminates.

[0003] For example, Patent Document 1 describes controlling scratch resistance by specifying the dynamic friction coefficient of the antireflection layer. Furthermore, Patent Document 2 describes controlling scratch resistance by specifying the surface roughness and silica fine particle diameter of the hard coat layer. Furthermore, Patent Document 3 describes controlling mechanical properties by specifying the average particle diameter of low-refractive-index nanoparticles and the solid content ratio of inorganic particles in the low-refractive-index layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-008877 [Patent Document 2] Japanese Patent Application Publication No. 2019-136880 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-106240 Summary of the Invention [Problem to be solved by the invention]

[0005] Further improvement in the scratch resistance of optical laminates is required, and the development of new structures for improving scratch resistance is required.

[0006] The present invention has been made in view of the above problems, and has an object to provide an optical laminate, an article, and an image display device that are excellent in abrasion resistance. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides the following means.

[0008] (1) An optical laminate according to a first aspect is an optical laminate in which a transparent substrate, a hard coat layer, an optical functional layer, and an antifouling layer are laminated in this order, wherein the hard coat layer contains a filler, the hard coat layer has a thickness of 3 μm or more and 25 μm or less, and the 10-point average roughness Rz of the surface of the optical laminate is 19 nm or more and 100 nm or less.

[0009] (2) In the optical laminate according to the above aspect, the apparent average particle size of the filler aggregates obtained by measuring the surface of the optical laminate with an atomic force microscope may be 150 nm or more and 2200 nm or less.

[0010] (3) In the optical layered body according to the above aspect, the apparent average particle size of the filler aggregates, which is obtained by measuring the surface of the hard coat layer with an atomic force microscope, may be 110 nm or more and 1600 nm or less.

[0011] (4) In the optical laminate according to the above aspect, the optical functional layer may include at least a low refractive index layer.

[0012] (5) In the optical laminate according to the above aspect, the optical functional layer may be formed by alternately laminating low refractive index layers and high refractive index layers.

[0013] (6) In the optical layered body according to the above aspect, the water contact angle after 2000 cycles of a steel wool sliding test may be 84% or more of the water contact angle before the steel wool sliding test.

[0014] (7) In the optical laminate according to the above aspect, the antifouling layer may contain a fluorine-based compound.

[0015] (8) An article according to a second aspect includes the optical laminate according to the above aspect.

[0016] (9) An image display device according to a third aspect includes a screen and the optical laminate according to the above aspect formed on the surface of the screen. [Effects of the Invention]

[0017] The optical laminate, article, and image display device according to the above aspects have excellent scratch resistance. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view of an example of an optical laminate according to a first embodiment. [Figure 2] FIG. 2 is a schematic diagram of an example of a manufacturing apparatus for manufacturing the optical laminate according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present embodiment will be described in detail below with reference to the drawings as appropriate. The drawings used in the following description may show characteristic portions enlarged for the sake of clarity, and the dimensional ratios of each component may differ from the actual ones. The materials, dimensions, etc. exemplified in the following description are merely examples, and the present invention is not limited thereto. Appropriate changes can be made within the scope of the effects of the present invention.

[0020] 1 is a cross-sectional view of an example of an optical laminate 10 according to the first embodiment. The optical laminate 10 includes a transparent substrate 1, a hard coat layer 2, an adhesive layer 3, an optical functional layer 4, and an antifouling layer 5 laminated in this order.

[0021] The transparent substrate 1 is made of a transparent material that can transmit light in the visible light range. The transparent substrate 1 is, for example, a plastic film. Examples of materials that make up the plastic film include polyester resins, acetate resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins, polyvinyl alcohol resins, polyarylate resins, and polyphenylene sulfide resins. The transparent substrate 1 is an inorganic substrate and may be a glass film.

[0022] The transparent substrate 1 is preferably made of a polyester resin, an acetate resin, a polycarbonate resin, or a polyolefin resin. The transparent substrate 1 is preferably made of, for example, a triacetyl cellulose (TAC) substrate. When the plastic film is made of a TAC substrate, forming a hard coat layer 2 on one surface thereof results in the formation of a permeation layer in which some of the components constituting the hard coat layer 2 permeate. As a result, the adhesion between the transparent substrate 1 and the hard coat layer 2 is improved, and the occurrence of interference fringes due to the difference in refractive index between the layers can be suppressed.

[0023] In the present invention, the term "transparent material" refers to a material having a transmittance of 80% or more for light in the wavelength range used, provided that the effect of the present invention is not impaired. In addition, in this embodiment, "(meth)acrylic" means methacrylic and acrylic.

[0024] The transparent substrate 1 may contain a reinforcing material as long as the optical properties are not significantly impaired. Examples of the reinforcing material include cellulose nanofiber and nanosilica.

[0025] The transparent substrate 1 may be a film having optical and / or physical functions. Examples of films having optical and / or physical functions include a polarizing plate, a retardation compensation film, a heat-shielding film, a transparent conductive film, a brightness-enhancing film, and a barrier-enhancing film.

[0026] The thickness of the transparent substrate 1 is not particularly limited, but is, for example, 25 μm or more, and preferably 40 μm or more. When the thickness of the transparent substrate 1 is 25 μm or more, the rigidity of the substrate itself is ensured, and wrinkles are less likely to occur even when stress is applied to the optical laminate 10. Furthermore, when the thickness of the transparent substrate 1 is 25 μm or more, wrinkles are less likely to occur even when the hard coat layer 2 is continuously formed on the transparent substrate 1, and there are fewer concerns about production. When the thickness of the transparent substrate 1 is 40 μm or more, wrinkles are even less likely to occur.

[0027] When the optical laminate 10 is wound up and unwound into a roll during production, the thickness of the transparent substrate 1 is preferably 1000 μm or less, and more preferably 600 μm or less. When the thickness of the transparent substrate 1 is 1000 μm or less, the optical laminate 10 during production and the optical laminate 10 after production can be easily wound into a roll, improving the production efficiency of the optical laminate 10. Furthermore, when the thickness of the transparent substrate 1 is 1000 μm or less, the optical laminate 10 can be made thinner and lighter. When the thickness of the transparent substrate 1 is 600 μm or less, the optical laminate 10 can be produced more efficiently and can be made even thinner and lighter, which is preferable.

[0028] The surface of the transparent substrate 1 may be previously subjected to an etching treatment such as sputtering, corona discharge, ultraviolet irradiation, electron beam irradiation, chemical conversion, or oxidation, and / or a primer treatment. By previously performing these treatments, the adhesion of the hard coat layer 2 to be formed on the transparent substrate 1 is improved. Furthermore, before forming the hard coat layer 2 on the transparent substrate 1, the surface of the transparent substrate 1 may be subjected to solvent washing, ultrasonic cleaning, or the like, as necessary, to remove dust and clean the surface of the transparent substrate 1.

[0029] The hard coat layer 2 contains a binder resin and a filler, and may also contain a flocculating agent.

[0030] The binder resin is preferably transparent, and examples thereof include ionizing radiation curable resins that are cured by ultraviolet light or electron beams, thermoplastic resins, and thermosetting resins.

[0031] Examples of ionizing radiation curable resins that are binder resins include ethyl (meth)acrylate, ethylhexyl (meth)acrylate, styrene, methylstyrene, and N-vinylpyrrolidone. The ionizing radiation curable resin may also be a compound having two or more unsaturated bonds. Examples of ionizing radiation curable resins having two or more unsaturated bonds include trimethylolpropane tri(meth)acrylate, tripropylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, and dipentaerythritol tetra(meth)acrylate. and polyfunctional compounds such as tetrapentaerythritol penta(meth)acrylate, tripentaerythritol octa(meth)acrylate, tetrapentaerythritol deca(meth)acrylate, isocyanuric acid tri(meth)acrylate, isocyanuric acid di(meth)acrylate, polyester tri(meth)acrylate, polyester di(meth)acrylate, bisphenol di(meth)acrylate, diglycerin tetra(meth)acrylate, adamantyl di(meth)acrylate, isobornyl di(meth)acrylate, dicyclopentane di(meth)acrylate, tricyclodecane di(meth)acrylate, and ditrimethylolpropane tetra(meth)acrylate. Among these, pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), and pentaerythritol tetraacrylate (PETTA) are preferably used as the binder resin. The term "(meth)acrylate" refers to methacrylate and acrylate. The ionizing radiation curable resin may be one obtained by modifying the above-mentioned compounds with PO (propylene oxide), EO (ethylene oxide), CL (caprolactone), or the like. The ionizing radiation curable resin is preferably an acrylic ultraviolet curable resin composition.

[0032] Examples of thermoplastic resins that serve as binder resins include styrene-based resins, (meth)acrylic resins, vinyl acetate-based resins, vinyl ether-based resins, halogen-containing resins, alicyclic olefin-based resins, polycarbonate-based resins, polyester-based resins, polyamide-based resins, cellulose derivatives, silicone-based resins, and rubber or elastomers. The thermoplastic resins are amorphous and soluble in organic solvents (particularly common solvents that can dissolve multiple polymers and curable compounds). In particular, from the viewpoints of transparency and weather resistance, the binder resin is preferably a styrene-based resin, (meth)acrylic resin, alicyclic olefin-based resin, polyester-based resin, cellulose derivatives (cellulose esters, etc.), or the like.

[0033] The thermosetting resin that is the binder resin may be, for example, a phenol resin, a urea resin, a diallyl phthalate resin, a melamine resin, a guanamine resin, an unsaturated polyester resin, a polyurethane resin, an epoxy resin, an aminoalkyd resin, a melamine-urea co-condensation resin, a silicon resin, or a polysiloxane resin (including so-called silsesquioxanes such as cage-shaped and ladder-shaped silsesquioxanes).

[0034] The hard coat layer 2 may contain an organic resin and an inorganic material, or may be an organic-inorganic hybrid material. One example is a layer formed by a sol-gel method. Examples of inorganic materials include silica, alumina, zirconia, and titania. Examples of organic materials include acrylic resin.

[0035] The filler may be an organic material, an inorganic material, or a mixture of organic and inorganic materials. The filler contained in the hard coat layer 2 can be selected from a variety of materials depending on the intended use of the optical laminate 10, taking into account factors such as antiglare properties, adhesion to the optical functional layer 4 (described later), and antiblocking properties. Specifically, known fillers such as silica (oxide of silicon) particles, alumina (aluminum oxide) particles, and organic fine particles can be used. To impart toughness to the hard coat layer 2, various reinforcing materials may be added as fillers within a range that does not impair the optical properties. Examples of reinforcing materials include cellulose nanofibers.

[0036] When the filler is silica particles and / or alumina particles, the average particle size of the filler is, for example, 800 nm or less, preferably 100 nm or less, and more preferably 40 nm to 70 nm.When the filler is organic fine particles, the average particle size of the organic fine particles is, for example, 10 μm or less, preferably 5 μm or less, and more preferably 3 μm or less.

[0037] The filler is dispersed in the hard coat layer 2 while some of the filler aggregates. The aggregates of the filler become secondary particles. For example, if the resin content in the hard coat layer 2 is considered to be the sea and the filler aggregates are considered to be islands, the resin content and filler in the hard coat layer 2 form a sea-island structure. The filler aggregates form irregularities on the surface of the hard coat layer 2.

[0038] When the surface of the hard coat layer 2 is measured with an atomic force microscope (AFM), filler aggregates can be confirmed as unevenness. The surface shape of the hard coat layer 2 can be measured, for example, using an atomic force microscope (AFM5000) manufactured by Hitachi High-Tech Science Corporation. The apparent average particle size of the filler aggregates obtained by measuring the surface of the hard coat layer 2 with an atomic force microscope is, for example, 110 nm to 1600 nm, preferably 230 nm to 1600 nm, and more preferably 300 nm to 1600 nm. As the apparent average particle size increases, the surface unevenness increases, making it possible to further reduce sliding damage in recessed areas. As a result, antifouling properties are easily maintained even with increased sliding cycles, and scratches are less likely to occur.

[0039] The apparent average particle size of filler aggregates is determined using AFM according to Otsu's automatic threshold setting method (e.g., Transactions of the Institute of Electronics and Communication Engineers, D63(4) pp.349-356, 1980-04). Otsu's automatic threshold setting method is a classification method proposed by Otsu et al., which classifies a population into two classes by setting a threshold that minimizes the intra-class variance and maximizes the inter-class variance. The threshold obtained by this method is equivalent to the threshold that minimizes the mean square error of the binary image obtained as the original grayscale image.

[0040] The AFM displays the difference in distance between the AFM probe and the surface of the hard coat layer 2 as a grayscale image. This grayscale image is classified according to Otsu's automatic threshold setting method, thereby classifying the concave and convex portions on the surface of the hard coat layer 2. The average particle size of the classified convex portions becomes the apparent average particle size of the filler aggregates. To determine the apparent average particle size of the filler aggregates, a 10 x 10 μm area is measured with the AFM at five arbitrary points on the film, and the average particle sizes determined at each of the five points are then averaged.

[0041] The degree of filler aggregation can be controlled by the stirring conditions when mixing the filler with the binder resin, the surface treatment of the filler, the addition of an aggregating agent, and the amount of the aggregating agent added. Examples of aggregating agents include substances that are poorly compatible with the binder resin and polar substances with high polarity. For example, compounds having oxygen or nitrogen in a cyclic structure function as aggregating agents. Other known aggregating agents can also be used.

[0042] The ten-point average roughness Rz of the surface of the hard coat layer 2 is, for example, 21 nm or more and 110 nm or less, preferably 50 nm or more and 110 nm or less. The arithmetic average roughness of the surface of the hard coat layer 2 is, for example, 1.7 nm or more and 12 nm or less.

[0043] The filler may be partially exposed on the surface of the hard coat layer 2 facing the adhesion layer 3. In this case, the binder resin of the hard coat layer 2 and the adhesion layer 3 are strongly bonded together. This improves the adhesion between the hard coat layer 2 and the adhesion layer 3, increases the hardness of the hard coat layer 2, and improves the scratch resistance of the optical laminate 10.

[0044] The thickness of the hard coat layer 2 is 3 μm or more and 25 μm or less. If the thickness of the hard coat layer 2 is 3 μm or more, reaction inhibition by oxygen in the curing reaction of the binder resin can be suppressed. Furthermore, by keeping the thickness of the hard coat layer 2 within this range, the unevenness of the surface of the hard coat layer 2 can be kept within a predetermined range.

[0045] The hard coat layer 2 may be a single layer or may be a laminate of multiple layers. The hard coat layer 2 may further be provided with known functions such as ultraviolet absorption, antistatic properties, refractive index adjustment, and hardness adjustment. The functions provided to the hard coat layer 2 may be provided in a single hard coat layer or may be provided separately in multiple layers.

[0046] The adhesive layer 3 is a layer for improving adhesion between the hard coat layer 2 and the optical functional layer 4. When the hard coat layer 2 is made of an inorganic material, the adhesive layer 3 may be omitted.

[0047] The adhesion layer 3 is, for example, an oxygen-deficient metal oxide or metal. An oxygen-deficient metal oxide refers to a metal oxide in which the number of oxygen atoms is deficient compared to the stoichiometric composition. Examples of oxygen-deficient metal oxides include SiOx, AlOx, TiOx, ZrOx, CeOx, MgOx, ZnOx, TaOx, SbOx, SnOx, and MnOx. Examples of metals include Si, Al, Ti, Zr, Ce, Mg, Zn, Ta, Sb, Sn, and Mn. The adhesion layer 3 may be, for example, SiOx, where x is greater than 0 and less than 2.0.

[0048] From the viewpoint of maintaining transparency and obtaining good optical properties, the thickness of the adhesive layer 3 is preferably more than 0 nm and not more than 20 nm, and particularly preferably 1 nm or more and 10 nm or less.

[0049] The optical function layer 4 is a layer that exhibits an optical function. The optical function is a function that controls the reflection, transmission, and refraction, which are properties of light, and examples thereof include an antireflection function, a selective reflection function, an antiglare function, and a lens function. The optical function layer 4 is, for example, an antireflection layer, a selective reflection layer, or an antiglare layer. Known antireflection layers, selective reflection layers, and antiglare layers can be used. The antireflection layer, selective reflection layer, and antiglare layer may each be a single layer or a laminate of multiple layers.

[0050] The optical functional layer 4 shown in Fig. 1 is an anti-reflection layer. The optical functional layer 4 shown in Fig. 1 has a high refractive index layer 4a and a low refractive index layer 4b. The optical functional layer 4 shown in Fig. 1 is a laminate of four layers in total, in which the high refractive index layers 4a and the low refractive index layers 4b are alternately stacked in this order from the adhesive layer 3 side. The number of high refractive index layers 4a and the low refractive index layers 4b is not particularly limited, and the number of high refractive index layers 4a and the low refractive index layers 4b can be any number.

[0051] The optical laminate 10 shown in FIG. 1 exhibits an anti-reflection function by interference of light reflected at each interface of the laminate in which high refractive index layers 4a and low refractive index layers 4b are alternately stacked, and by diffusing light incident from the antifouling layer 5 side.

[0052] The low refractive index layer 4b contains, for example, an oxide of Si. The low refractive index layer 4b is a layer whose main component is, for example, SiO2 (oxide of Si). Si oxide is easily available and has an advantage in terms of cost. A single SiO2 layer is colorless and transparent. In this embodiment, the main component of the low refractive index layer 4b means a component contained in the low refractive index layer 4b at 50 mass % or more.

[0053] When the low refractive index layer 4b is a layer containing an oxide of Si as a main component, it may contain less than 50 mass% of another element. The content of elements other than the oxide of Si is preferably 10% or less. Examples of other elements include Na, Zr, Al, and N. Na increases the durability of the low refractive index layer 4b. Zr, Al, and N increase the hardness and alkali resistance of the low refractive index layer 4b.

[0054] The refractive index of the low refractive index layer 4b is, for example, 1.20 or more and 1.60 or less, and preferably 1.30 or more and 1.50 or less. The dielectric material used for the low refractive index layer 4b is, for example, magnesium fluoride (MgF2, refractive index 1.38).

[0055] The refractive index of the high refractive index layer 4a is, for example, 2.00 or more and 2.60 or less, and preferably 2.10 or more and 2.45 or less.

[0056] Examples of dielectric materials used for the high-refractive-index layer 4a include niobium pentoxide (NbO, refractive index 2.33), titanium oxide (TiO, refractive index 2.33 to 2.55), tungsten oxide (WO, refractive index 2.2), cerium oxide (CeO, refractive index 2.2), tantalum pentoxide (TaO, refractive index 2.16), zinc oxide (ZnO, refractive index 2.1), indium tin oxide (ITO, refractive index 2.06), and zirconium oxide (ZrO, refractive index 2.2). When it is desired to impart conductive properties to the high-refractive-index layer 4a, for example, ITO or indium zinc oxide (IZO) can be selected as the dielectric material used for the high-refractive-index layer 4a.

[0057] In the optical function layer 4, it is preferable to use, for example, a layer made of niobium pentoxide (Nb2O5, refractive index 2.33) as the high refractive index layer 4a and a layer made of SiO2 as the low refractive index layer 4b.

[0058] The film thickness of the low refractive index layer 4b may be in the range of 1 nm to 200 nm, and is appropriately selected depending on the wavelength range in which anti-reflection function is required. The film thickness of the high refractive index layer 4a may be, for example, in the range of 1 nm to 200 nm, and is appropriately selected depending on the wavelength range in which anti-reflection function is required. The film thicknesses of the high refractive index layer 4a and the low refractive index layer 4b can be appropriately selected depending on the design of the optical function layer 4. For example, from the adhesive layer 3 side, the high refractive index layer 4a can be 5 to 50 nm, the low refractive index layer 4b can be 10 to 80 nm, the high refractive index layer 4a can be 20 to 200 nm, and the low refractive index layer 4b can be 50 to 200 nm.

[0059] Of the layers forming the optical functional layer 4, for example, a low refractive index layer 4b is disposed on the side of the antifouling layer 5. When the low refractive index layer 4b of the optical functional layer 4 is in contact with the antifouling layer 5, the antireflection performance of the optical functional layer 4 is improved.

[0060] The antifouling layer 5 is on the outermost surface of the optical functional layer 4. The antifouling layer 5 prevents the optical functional layer 4 from being soiled. Furthermore, when the antifouling layer 5 is applied to a touch panel or the like, it suppresses wear of the optical functional layer 4 due to its abrasion resistance and scratch resistance.

[0061] The antifouling layer 5 is, for example, a vapor-deposited film formed by vapor-depositing an antifouling material. The antifouling layer 5 is formed, for example, by vacuum-depositing a fluorine-based compound as the antifouling material on one surface of the low refractive index layer 4b constituting the optical function layer 4. When the antifouling layer 5 contains a fluorine-based compound, the abrasion resistance and alkali resistance of the optical laminate 10 are further improved.

[0062] The fluorine-based compound contained in the anti-fouling layer 5 is, for example, a fluorine-based organic compound. The fluorine-based organic compound is, for example, a compound comprising a fluorine-modified organic group and a reactive silyl group (e.g., alkoxysilane). Commercially available products that can be used for the anti-fouling layer 5 include Optool DSX (manufactured by Daikin Corporation) and KY-100 series (manufactured by Shin-Etsu Chemical Co., Ltd.).

[0063] When a compound consisting of a fluorine-modified organic group and a reactive silyl group (e.g., alkoxysilane) is used for the antifouling layer 5 and SiO2 is used for the low refractive index layer 4b of the optical function layer 4, a siloxane bond is formed between the silanol group, which is the skeleton of the fluorine-based organic compound, and the SiO2. The siloxane bond improves the adhesion between the optical function layer 4 and the antifouling layer 5.

[0064] The optical thickness of the antifouling layer 5 is, for example, 1 nm or more and 20 nm or less, and preferably 3 nm or more and 10 nm or less. When the thickness of the antifouling layer 5 is 1 nm or more, sufficient abrasion resistance can be ensured when the optical laminate 10 is used for touch panels, etc. Furthermore, when the thickness of the antifouling layer 5 is 20 nm or less, the time required for vapor deposition can be shortened, allowing for efficient production.

[0065] The antifouling layer 5 may contain additives such as light stabilizers, ultraviolet absorbers, colorants, antistatic agents, lubricants, leveling agents, antifoaming agents, antioxidants, flame retardants, infrared absorbers, and surfactants, as needed.

[0066] The antifouling layer 5 formed by vapor deposition is tightly bonded to the optical function layer 4 and is dense with few voids. Therefore, the antifouling layer 5 formed by vapor deposition exhibits properties different from those of antifouling layers formed by other methods, such as coating an antifouling material.

[0067] The optical laminate 10 having the antifouling layer 5 formed by vapor deposition has the following properties: (1) After an abrasion test in which steel wool is horizontally reciprocated 500 times, the difference in contact angle with water is 10° or less. (2) After an abrasion test in which steel wool is moved back and forth horizontally 500 times, the contact angle with water is 110° or more.

[0068] (3) After an abrasion test in which a cloth (nonwoven fabric wiper) is moved back and forth 4,000 times, the contact angle with water is 100° or more. (4) The L value shown by the following formula (1) was measured by SCI (Specular Component Include, a method for measuring reflected color that takes specular reflection into account) before and after the abrasion test in which steel wool was moved back and forth horizontally 500 times. * a * b * The change in value (ΔE value) is 3.0 or less.

[0069] (5) The L shown by the following formula (1) measured by SCE (Specular Component Exclude, a method for measuring reflected color that does not take into account specular reflected light) before and after an abrasion test in which steel wool is moved back and forth horizontally 500 times. * a * b * The change in value (ΔE value) is 1.5 or less. (6) The residual fluorine rate measured by X-ray fluorescence analysis (XRF) after immersion in a 0.1 mol / L NaOH solution (liquid temperature 55°C) for 4 hours is 70% or more.

[0070]

number

[0071] In formula (1), L0 * , a0 * , b0 * is the value before the scratch test, and L1 * , a1 * , b1* is the value after the scratch test.

[0072] The antifouling layer 5 formed by vapor deposition has fewer voids and is denser than an antifouling layer formed by coating. Furthermore, the antifouling layer 5 formed by vapor deposition is more firmly bonded to the low refractive index layer 4b than an antifouling layer 5 formed by coating.

[0073] The outermost surface of the optical laminate 10 (the surface of the antifouling layer 5) is uneven. The unevenness of the outermost surface of the optical laminate 10 is due to the unevenness formed on the surface of the hard coat layer 2. An adhesion layer 3, an optical functional layer 4, and an antifouling layer 5 are laminated on the hard coat layer 2, but the thickness of each layer is not thick enough to cover the unevenness on the surface of the hard coat layer 2. Therefore, the outermost surface of the optical laminate 10 is uneven, reflecting the unevenness on the surface of the hard coat layer 2.

[0074] The ten-point average roughness Rz of the outermost surface of the optical laminate 10 is 19 nm or more and 100 nm or less, and preferably 40 nm or more and 100 nm or less. When the ten-point average roughness Rz of the outermost surface of the optical laminate 10 is within a predetermined range, the antifouling layer 5 is less likely to peel off when contacted with wiping or the like. When the antifouling layer 5 is not peeled off, the scratch resistance of the optical laminate 10 is improved.

[0075] The arithmetic mean Ra of the optical laminate 10 is, for example, 1.9 nm or more and 13 nm or less, and preferably 4 nm or more and 13 nm or less.

[0076] When the surface of the optical laminate 10 is measured with an atomic force microscope (AFM), unevenness caused by the filler aggregates in the hard coat layer 2 can be confirmed. The apparent average particle size of the filler aggregates obtained by measuring the surface of the optical laminate 10 with an atomic force microscope is, for example, 150 nm or more and 2200 nm or less, and preferably 340 nm or more and 2200 nm or less. The apparent average particle size of the filler aggregates is measured by the same method as for the surface of the hard coat layer 2.

[0077] The water contact angle value after 2000 cycles of the steel wool sliding test on the surface of the optical laminate 10 is 84% ​​or more, preferably 88% or more, of the water contact angle value before the steel wool sliding test.

[0078] [Method of manufacturing optical laminate] As an example, a case where an optical laminate 10 is produced using a transparent substrate 1 wound in a roll shape will be described.

[0079] First, the transparent substrate 1 wound in a roll shape is unwound. Then, a slurry containing a material for the hard coat layer 2 is applied onto the transparent substrate 1 by a known method, and cured by a known method corresponding to the material for the hard coat layer 2. Here, for example, a flocculant is added to the slurry containing the material for the hard coat layer 2. Furthermore, a material that is poorly compatible with the resin component of the hard coat layer 2 (for example, a compound having oxygen or nitrogen in a cyclic structure) may be mixed into the slurry containing the material for the hard coat layer 2. After curing, predetermined irregularities are formed on the surface of the hard coat layer 2. Then, the transparent substrate 1 with the hard coat layer 2 formed on its surface is wound into a roll by a known method.

[0080] Next, an adhesion layer forming step is performed to form an adhesion layer 3 on the hard coat layer 2, and an optical function layer forming step is performed to form an optical function layer 4. Thereafter, an antifouling layer forming step is performed to form an antifouling layer 5 on the optical function layer 4. Before the optical function layer forming step, a first surface treatment step may be performed to treat the surface of the hard coat layer 2. Furthermore, after the optical function layer forming step, a second surface treatment step may be performed to treat the surface of the antireflection film.

[0081] Furthermore, it is preferable that the first surface treatment step, the adhesion layer formation step, the optical functional layer formation step, the second surface treatment step, and the antifouling layer formation step are carried out continuously while maintaining the optical laminate in the middle of production under reduced pressure.

[0082] 2 shows an example of a manufacturing apparatus that can be used to manufacture the optical laminate 10 according to the first embodiment. The manufacturing apparatus 20 includes a roll unwinding apparatus 14, a pretreatment apparatus 12A, a sputtering apparatus 11, a pretreatment apparatus 12B, a vapor deposition apparatus 13, and a roll winding apparatus 15, which are connected in this order. The manufacturing apparatus 20 unwinds the substrate from a roll, passes it through these connected apparatuses in order, and then winds it up, thereby producing the optical laminate 10 by a roll-to-roll method.

[0083] The conveying speed (line speed) of the optical laminate 10 during production can be set appropriately, and is preferably, for example, 0.5 to 20 m / min, and more preferably 0.5 to 10 m / min.

[0084] The roll unwinding device 14 has a chamber 34, a vacuum pump 21, an unwinding roll 23, and a guide roll 22. The pressure inside the chamber 34 is reduced by the vacuum pump 21. The vacuum pump 21 is a known pump. The transparent substrate 1 on which the hard coat layer 2 is formed is wound around the unwinding roll 23. The unwinding roll 23 supplies the transparent substrate 1 on which the hard coat layer 2 is formed to the pretreatment device 12A at a predetermined transport speed.

[0085] The pretreatment device 12A has a chamber 32, a can roll 26, a guide roll 22, and a plasma discharge device 42. The can roll 26, the guide roll 22, and the plasma discharge device 42 are installed in the chamber 32. The chamber 32 is connected to the chambers 31 and 34. The pressure inside the chamber 32 is reduced.

[0086] The can roll 26 and the guide roll 22 transport the film sent from the roll unwinding device 14 at a predetermined transport speed.

[0087] The plasma discharge device 42 is disposed facing the outer peripheral surface of the can roll 26 at a predetermined distance. The plasma discharge device 42 ionizes gas by glow discharge. The gas may be, for example, argon gas, oxygen gas, nitrogen gas, or helium gas. Argon gas is preferred because it is inexpensive, inert, and does not affect optical properties. The plasma discharge device 42 is, for example, a glow discharge device that ionizes argon gas by high-frequency plasma.

[0088] The plasma discharge device 42 performs a first surface treatment process as a pretreatment for the surface on which the adhesion layer 3 and the optical functional layer 4 are formed. In the first surface treatment process, the can roll 26 and the guide roll 22 are rotated to treat the surface of the hard coat layer 2 at a predetermined conveying speed. The plasma discharge device 42 performs, for example, glow discharge treatment, plasma treatment, ion etching, alkali treatment, etc. Glow discharge treatment is capable of treating large areas. The glow discharge treatment roughens the surface of the hard coat layer 2 at the nano level and removes substances with weak bonding strength that are present on the surface of the hard coat layer 2. As a result, the adhesion between the hard coat layer 2 and the adhesion layer 3 formed on the hard coat layer 2 is improved.

[0089] After passing through the plasma discharge device 42 , the film is transported to the sputtering device 11 .

[0090] The sputtering apparatus 11 has a chamber 31, a vacuum pump 21, a film-forming roll 25, a guide roll 22, and a film-forming section 41. The film-forming roll 25, the guide roll 22, and the film-forming section 41 are installed in the chamber 31. The chamber 31 is depressurized by the vacuum pump 21. In the chamber 31 of the sputtering apparatus 11, an adhesion layer forming step and an optical function layer forming step are performed.

[0091] The film-forming roll 25 and the guide roll 22 transport the film at a predetermined transport speed. The sputtering device 11 laminates an adhesion layer 3, a high refractive index layer 4a, and a low refractive index layer 4b in this order by sputtering on the hard coat layer 2 of the transparent substrate 1 traveling on the film-forming roll 25. The optical function layer 4 is formed by alternately laminating the high refractive index layers 4a and the low refractive index layers 4b.

[0092] A plurality of film forming units 41 are disposed opposite the outer peripheral surface of the film forming roll 25 at a predetermined interval, and are provided so as to surround the film forming roll 25. The number of film forming units 41 is determined depending on the total number of laminations of the adhesive layer 3 and the high refractive index layers 4a and low refractive index layers 4b that form the optical function layer 4. A plurality of film forming rolls 25 or chambers 31 may be provided to ensure space for arranging the film forming units 41.

[0093] Each film forming unit 41 is, for example, a sputtering device. Each film forming unit 41 includes, for example, a target, a voltage applying unit to the target, a gas supply unit for supplying reactive gases, etc., and a magnetic field generating source for forming a magnetic field on the target surface. The target varies depending on the film to be formed. For example, when forming a layer made of SiO2, Si is used as the target and O2 is used as the reactive gas. Also, when forming a layer made of Nb2O5, Nb is used as the target and O2 is used as the reactive gas. The film forming method of the film forming unit 41 is, for example, a sputtering method, preferably a magnetron sputtering method. Other methods include a two-pole sputtering method using plasma generated by DC glow discharge or high frequency, and a three-pole sputtering method with an additional hot cathode.

[0094] The sputtering apparatus 11 may have an optical monitor that measures the optical properties of each layer after it is deposited. The optical monitor checks the quality of each layer. For example, the optical monitor measures the optical properties of each layer in the width direction using an optical head that can scan in the width direction. The optical monitor can measure the optical thickness distribution of each layer in the width direction, for example, by measuring the peak wavelength of reflectance as the optical property and converting it into optical thickness. By measuring the optical properties using the optical monitor, it is possible to form an adhesion layer 3 and an optical functional layer 4 with optimal optical properties while adjusting the sputtering conditions in real time.

[0095] The film on which the adhesive layer 3 and the optical functional layer 4 are formed is transported to the pretreatment device 12B.

[0096] Pretreatment device 12B has a chamber 32, a can roll 26, a guide roll 22, and a plasma discharge device 42. The configuration of pretreatment device 12B is the same as that of pretreatment device 12A. Within chamber 32 of pretreatment device 2B, a second surface treatment step is performed as a pretreatment for the surface on which antifouling layer 5 is to be formed. The surface roughness of the film surface after the second surface treatment step may change. The surface roughness of the surface on which antifouling layer 5 is to be laminated may be adjusted by changing the conditions of the second surface treatment step. The pretreated film is transported to vapor deposition device 13.

[0097] The vapor deposition device 13 has a chamber 33, a vacuum pump 21, guide rolls 22, a vapor deposition source 43, and a heating device 53. The pressure inside the chamber 33 is reduced by the vacuum pump 21. The vapor deposition device 13 vapor-deposits an antifouling layer 5 onto the transported film.

[0098] The vapor deposition source 43 is located opposite the film being transported approximately horizontally between two adjacent guide rolls 22. The vapor deposition source 43 supplies evaporated gas made of a material that will become the antifouling layer 5 onto the optical function layer 4. The orientation of the vapor deposition source 43 can be set as desired.

[0099] The heating device 53 heats the material that will become the stain-resistant layer 5 to a vapor pressure temperature. The heating device 53 uses, for example, a resistance heating method, a heater heating method, an induction heating method, or an electron beam heating method.

[0100] The deposition device 13 includes, for example, a guide plate, a film thickness gauge, a vacuum pressure gauge, and a power supply. The guide plate guides the evaporated deposition material to a desired position. The film thickness gauge measures the deposited film thickness. The vacuum pressure gauge measures the degree of vacuum within the chamber 33. The vacuum pressure gauge is, for example, an ion gauge. The power supply is, for example, a high-frequency power supply.

[0101] The film on which the antifouling layer 5 has been formed in the vapor deposition device 13 is transported to a roll winding device 15. It is preferable that the steps from the optical functional layer formation process to the antifouling layer formation process be carried out continuously in-line while maintaining a reduced pressure state. This can prevent the formation of a natural oxide film and contamination by foreign matter.

[0102] The roll winding device 15 has a chamber 35, a vacuum pump 21, a winding roll 24, and a guide roll 22. The pressure inside the chamber 35 is reduced by the vacuum pump 21. The winding roll 24 winds up the optical laminate 10 that has been formed up to the antifouling layer 5. The winding roll 24 and the guide roll 22 wind up the optical laminate 10 at a predetermined winding speed. A carrier film may also be used if necessary. The optical laminate 10 can be produced by going through the above procedure.

[0103] The optical laminate 10 according to the first embodiment has a surface with a predetermined shape, so that the antifouling layer 5 is unlikely to peel off even when it is wiped or otherwise contacted. The antifouling layer 5 is easily peeled off from the optical laminate 10, so that the scratch resistance of the optical laminate 10 is unlikely to decrease. In other words, the optical laminate 10 can maintain its scratch resistance for a long period of time.

[0104] As described above, the present invention is not limited to the above-described embodiment, and various modifications and changes are possible within the scope of the gist of the present invention as defined in the claims.

[0105] For example, the optical laminate 10 may have layers other than the transparent substrate 1, the hard coat layer 2, the adhesive layer 3, the optical functional layer 4, and the antifouling layer 5. Furthermore, the optical laminate 10 may have various layers as needed on the surface of the transparent substrate 1 opposite the surface on which the optical functional layer 4 and the like are formed. For example, a pressure-sensitive adhesive layer used for adhesion to other members may be provided. Furthermore, another optical film may be provided via this pressure-sensitive adhesive layer. Examples of other optical films include films that function as polarizing films, retardation compensation films, half-wave plates, and quarter-wave plates.

[0106] Furthermore, a layer having functions such as anti-reflection, selective reflection, anti-glare, polarization, phase difference compensation, viewing angle compensation or widening, light guiding, diffusion, brightness improvement, hue adjustment, and conductivity may be formed directly on the opposing surface of the transparent substrate 1. A nano-order uneven structure that exhibits moth-eye and anti-glare functions may be formed on the surface of the optical laminate 10. Geometric shapes on the order of micrometers to millimeters, such as lenses and prisms, may be formed on the surface of the optical laminate 10.

[0107] The optical laminate 10 can also be applied to various products. For example, the optical laminate 10 may be provided on the screen of an image display unit such as a liquid crystal display panel or an organic EL display panel. This allows, for example, the touch panel display unit of a smartphone or operating device to exhibit high scratch resistance, resulting in an image display device suitable for practical use.

[0108] Furthermore, the article is not limited to image display devices, and the optical laminate 10 can be applied to window glass, goggles, the light receiving surface of a solar cell, the screen of a smartphone or a personal computer display, information input terminals, tablet terminals, AR (augmented reality) devices, VR (virtual reality) devices, electronic display boards, glass table surfaces, gaming machines, operation support devices for aircraft and trains, navigation systems, instrument panels, the surface of optical sensors, and the like. [Example]

[0109] "Example 1" First, a photocurable resin composition was prepared, containing 28 mass% of silica particles (filler) with an average particle size of 50 nm relative to the total solid content of the resin composition (binder resin). The resin composition was prepared by dissolving silica particles, acrylate, a leveling agent, and a photopolymerization initiator in a solvent, as shown in Table 1, and finally adding a flocculant.

[0110] [Table 1]

[0111] A roll of TAC film having a thickness of 80 μm and a length of 3900 m was prepared as a transparent substrate 1, and the above-described photocurable resin composition was applied onto the TAC film using a gravure coater. The resin composition was then irradiated with light to be cured, thereby forming a hard coat layer 2 having a thickness of 10 μm.

[0112] The surface roughness (arithmetic surface roughness Ra, 10-point average roughness Rz) and the apparent average particle size of the filler aggregates were determined for the hard coat layer 2. The surface roughness and the apparent average particle size of the filler aggregates were measured using an AFM.

[0113] Next, using the roll-to-roll method, an adhesion layer 3, an optical functional layer 4, and an antifouling layer 5 were continuously produced in this order on the transparent substrate 1 on which the hard coat layer 2 had been formed, by the method described below, to produce the optical laminate (anti-reflection film) of Example 1.

[0114] The manufacturing apparatus used was the manufacturing apparatus 20 shown in Fig. 2. The line speed was 2 m / min. The first surface treatment step, the adhesion layer forming step, the optical functional layer forming step, the second surface treatment step, and the antifouling layer forming step were continuously performed while the optical laminate in the middle of production was maintained under reduced pressure.

[0115] For hard coat layer 2, the treatment intensity of the glow discharge treatment was 4000W·min / m 2Then, on the hard coat layer 2 after the glow discharge treatment, an adhesion layer 3 made of SiOx and having a thickness of 5 nm was formed by sputtering in a chamber with a pressure of 1.0 Pa or less, and an optical function layer 4 (laminate) made of a 15 nm thick Nb2O5 film (high refractive index layer), a 38 nm thick SiO2 film (low refractive index layer), a 30 nm thick Nb2O5 film (high refractive index layer), and a 102 nm thick SiO2 film (low refractive index layer) was formed on the adhesion layer.

[0116] Then, a glow discharge treatment was performed on the surface of the optical functional layer 4. The cumulative power of the glow discharge treatment was 326 W·min / m 2 It was.

[0117] Next, an antifouling layer 5 made of an alkoxysilane compound having a perfluoropolyether group (KY-1901, manufactured by Shin-Etsu Chemical Co., Ltd.), which is an organic compound having fluorine, was formed on the optical functional layer 4 by vapor deposition at a vapor deposition chamber pressure of 0.01 Pa or less, a vapor deposition temperature of 230°C, and a line speed of 2.0 m / min. The layer was then wound into a roll to obtain the optical laminate (antireflection film) of Example 1.

[0118] The surface roughness (arithmetic surface roughness Ra, 10-point average roughness Rz) and the apparent average particle size of the filler aggregates of the prepared optical laminate were determined. The surface roughness and the apparent average particle size of the filler aggregates were measured using an AFM.

[0119] The optical properties of the optical laminate were also measured. The optical properties were measured using diffuse reflected light (SCE), haze, and transmittance (TT). The optical properties were measured using an optical spectrometer, NDH-5000SP, manufactured by Nippon Denshoku Industries Co., Ltd. The adhesion of the optical functional layer in the optical laminate was also tested. The adhesion was evaluated using a cross-cut test method in accordance with JIS K5400.

[0120] The optical laminate was also subjected to a scratch resistance test, which consisted of a steel wool test and a pen sliding test.

[0121] The steel wool test was carried out using a Type I friction tester conforming to JIS L0849. Steel wool (#0000 manufactured by Bonstar Co., Ltd.) was used as the friction body, and the friction body was moved back and forth horizontally along the surface of the optical laminate. The test settings were a load of 1000 g / cm. 2 The stroke was 75 mm, and the speed was 7 mm / s. The horizontal reciprocation was performed 2000 times, 3000 times, and 4000 times. The contact angle of the sample after the steel wool test was then measured.

[0122] The contact angle was measured by the ellipse fitting method under the following conditions using a fully automatic contact angle meter DM-700 (manufactured by Kyowa Interface Science Co., Ltd.): Distilled water was placed in a glass syringe, a stainless steel needle was attached to the tip, and pure water was dropped onto the optical laminate (test piece). Amount of pure water dropped: 2.0 μL Measurement temperature: 25℃ Pure water was dropped onto the test piece, and the contact angle was measured at six random points on the surface of the test piece four seconds later, and the average value was taken as the pure water contact angle (WCA).

[0123] In addition, the samples were visually inspected after the steel wool test to check for the presence or absence of scratches that could be visually confirmed. The visual evaluation was rated as "Good" if no scratches were found and "Poor" if scratches were found.

[0124] The pen sliding test was performed with a load of 200 g and a sliding speed of 60 rpm. The sliding distance was 5 cm, and the same location was slid linearly 50,000 times. The evaluation of the pen sliding test was performed with a "Good" if no scratches were found when the sliding area was visually inspected, and an "Poor" if scratches were found when the sliding area was visually inspected.

[0125] "Examples 2 to 5" Examples 2 to 5 differ from Example 1 in that the film thickness of the hard coat layer 2 and the amount of flocculant added to the resin composition for forming the hard coat layer 2 were changed. In Example 2, the film thickness of the hard coat layer 2 was set to 10 μm. In Example 3, the film thickness of the hard coat layer 2 was set to 3 μm. In Example 4, the film thickness of the hard coat layer 2 was set to 25 μm. In Example 5, the film thickness of the hard coat layer 2 was set to 5 μm.

[0126] For Examples 2 to 5, the same evaluations as in Example 1 were carried out, and tests were carried out on the surface state of the hard coat layer 2, the surface state of the optical laminate, the optical properties of the optical laminate, and the scratch resistance of the optical laminate.

[0127] "Comparative Examples 1 to 5" Comparative Examples 1 to 5 differ from Example 1 in that the film thickness of the hard coat layer 2 and the amount of flocculant added to the resin composition for forming the hard coat layer 2 were changed. In Comparative Example 1, the film thickness of the hard coat layer 2 was set to 3 μm. In Comparative Examples 2 and 3, the film thickness of the hard coat layer 2 was set to 10 μm. In Comparative Example 4, the film thickness of the hard coat layer 2 was set to 1 μm. In Comparative Example 5, the film thickness of the hard coat layer 2 was set to 30 μm.

[0128] For Comparative Examples 1 to 4, the same evaluations as in Example 1 were performed, and tests were conducted on the surface condition of the hard coat layer 2, the surface condition of the optical laminate, the optical properties of the optical laminate, and the scratch resistance of the optical laminate. In Comparative Example 5, cracks occurred on the entire surface of the sample after hard coat layer 2 was cured, and the cracks progressed further during the subsequent film formation process. Therefore, the scratch resistance test was not performed for Comparative Example 5. Furthermore, accurate evaluation of adhesion was not possible for Comparative Example 5. For the optical laminates of Comparative Examples 1 to 5, the cycle test using the steel wool test was terminated when scratches were visually confirmed on the surface after the steel wool test.

[0129] The following table summarizes the results of Examples 1 to 5 and Comparative Examples 1 to 5. In Table 2, HC is the hard coat layer, and WCA is the contact angle.

[0130] [Table 2] [Explanation of symbols]

[0131] 1...transparent substrate, 2...hard coat layer, 3...adhesion layer, 4...optical functional layer, 4a...high refractive index layer, 4b...low refractive index layer, 5...antifouling layer, 10...optical laminate

Claims

1. A plastic film, a hard coat layer, an adhesive layer, a high refractive index layer made of niobium pentoxide, and SiO ２ An optical laminate in which a low refractive index layer consisting of the above and an antifouling layer are laminated in this order, the hard coat layer contains a filler, the hard coat layer has a thickness of 3 μm or more and 25 μm or less, The 10-point average roughness Rz of the surface of the optical laminate is 19 nm or more and 100 nm or less, the apparent average particle size of the filler aggregates, which is obtained by measuring the surface of the optical laminate with an atomic force microscope, is 150 nm or more and 2200 nm or less; the antifouling layer contains a fluorine-based compound, the high refractive index layer and the low refractive index layer are both sputtered films, The antifouling layer is provided on the low refractive index layer.

2. A plastic film, a hard coat layer, an adhesive layer, a high refractive index layer made of niobium pentoxide, and SiO ２ An optical laminate in which a low refractive index layer consisting of the above and an antifouling layer are laminated in this order, the hard coat layer contains a filler, the hard coat layer has a thickness of 3 μm or more and 25 μm or less, The 10-point average roughness Rz of the surface of the optical laminate is 19 nm or more and 100 nm or less, the apparent average particle size of the filler aggregates, as measured on the surface of the hard coat layer with an atomic force microscope, is 110 nm or more and 1600 nm or less; the antifouling layer contains a fluorine-based compound, the high refractive index layer and the low refractive index layer are both sputtered films, The antifouling layer is provided on the low refractive index layer.

3. 3. The optical laminate according to claim 1, wherein the optical functional layer is formed by alternately laminating the low refractive index layers and the high refractive index layers.

4. The optical laminate according to any one of claims 1 to 3, wherein the water contact angle value after 2000 cycles of a steel wool sliding test is 84% ​​or more of the water contact angle value before the steel wool sliding test.

5. The optical laminate according to any one of claims 1 to 4, wherein the antifouling layer contains a fluorine-based compound.

6. An article comprising the optical laminate according to any one of claims 1 to 5.

7. An image display device comprising: a screen; and the optical laminate according to any one of claims 1 to 6 formed on a surface of the screen.

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