Optical stack

Abstract

To provide an optical laminate capable of having high transmissivity, achieving simultaneously high scratch resistance and anti fouling property, achieving low reflectance and having colorless transparent properties, a polarizer including the optical laminate, a display unit containing the optical laminate, and an organic light emission diode display unit including the optical laminate.SOLUTION: An optical laminate comprises: a polymer resin layer; and an optical functional layer which is formed on one surface of the polymer resin layer and includes a binder resin and hollow type organic nano particles and solid type organic nano particles dispersed in the binder resin. The optical laminate has a specific volume ratio of a zirconium element to a silicon element in a portion from an interface between the polymer resin layer and the optical functional layer to a thickness 5 nm to 10 nm region of the optical functional layer and a portion from the interface between the polymer resin layer and the optical functional layer to a thickness of 50 nm to 150 nm of the optical functional layer. There are also provided a polarizer comprising the same optical laminate, a display device, and an organic light emission diode display unit.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] [Cross-reference to related applications] This application claims the benefit of priority based on Korean Patent Application No. 10-2020-0138549, filed October 23, 2020, Korean Patent Application No. 10-2020-0138548, filed October 23, 2020, and Korean Patent Application No. 10-2020-0145418, filed November 3, 2020, and all contents disclosed in the documents of these Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to an optical laminate, and more particularly to an optical laminate that has low reflectance and high light transmittance, and can simultaneously achieve high scratch resistance and anti-fouling properties, thereby improving the clarity of the screen of a display device. [Background technology]

[0003] In general, optical films are attached to flat panel display devices such as PDPs and LCDs to minimize the reflection of light incident from the outside. Methods for minimizing light reflection include a method of dispersing fillers such as inorganic particles in a resin and coating the substrate film to create unevenness (anti-glare: AG coating), a method of forming multiple layers with different refractive indices on the substrate film to use light interference (anti-reflection: AR coating), or a combination of these methods.

[0004] Among them, the absolute amount of reflected light in the case of AG coating is the same as that of a general hard coating, but the amount of light entering the eye is reduced by scattering light due to the unevenness of the surface, resulting in a low reflection effect.However, since the clarity of the screen is reduced due to the unevenness of the surface of AG coating, much research has been conducted on AR coating recently.

[0005] Films using the AR coating have been commercially available that have a multilayer structure in which a high refractive index layer, a low-reflection coating layer, etc. are laminated on a substrate film. However, the method of forming multiple layers as described above has the disadvantage of poor interlayer adhesion (interfacial adhesion) due to the separate processes for forming each layer, resulting in poor scratch resistance.

[0006] Additionally, in the past, attempts to improve the scratch resistance of AR coatings mainly involved adding various nanometer-sized particles (e.g., silica, alumina, zeolite, etc.). However, when using nanometer-sized particles, there was a limit to how much reflectivity could be reduced while simultaneously improving scratch resistance, and the nanometer-sized particles significantly reduced the stain resistance of the optical film surface.

[0007] Therefore, much research has been conducted to reduce the absolute amount of reflection of externally incident light and improve the scratch resistance and stain resistance of the surface, but the degree of improvement in physical properties as a result is insufficient. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention provides an optical laminate that has high light transmittance, and can simultaneously achieve high scratch resistance and antifouling properties, and that has colorless and transparent properties while achieving low reflectance.

[0009] The present invention also provides a polarizing plate comprising the optical laminate.

[0010] The present invention also provides a display device including the optical laminate.

[0011] The present invention also provides an organic light emitting diode display device including the optical laminate. [Means for solving the problem]

[0012] This specification provides an optical laminate comprising: a polymer resin layer; and an optical functional layer formed on one surface of the polymer resin layer and containing a binder resin and hollow inorganic nanoparticles and solid inorganic nanoparticles dispersed in the binder resin; wherein the volume ratio of zirconium to silicon is less than 2.6 in a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5 nm to 10 nm of the optical functional layer, and the volume ratio of zirconium to silicon is 1.62 or more in a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 50 nm to 150 nm of the optical functional layer.

[0013] Also provided herein is a polarizing plate comprising the optical laminate and a polarizer.

[0014] Also provided herein is a display device comprising the optical laminate.

[0015] Also provided herein is an organic light emitting diode display device including the optical stack.

[0016] Hereinafter, optical laminates, polarizing plates, display devices, and organic light-emitting diode display devices according to specific embodiments of the invention will be described in more detail.

[0017] In this specification, a photopolymerizable compound is a general term for a compound that undergoes a polymerization reaction when irradiated with light, for example, visible light or ultraviolet light.

[0018] Furthermore, a fluorine-containing compound means a compound containing at least one fluorine element.

[0019] Also, (meth)acryl is meant to encompass both acryl and methacrylate.

[0020] Furthermore, the term "(co)polymer" means to include both copolymers and homopolymers.

[0021] Furthermore, the term "hollow silica particles" refers to silica particles derived from silicon compounds or organosilicon compounds, which have empty spaces on the surface and / or inside the silica particles.

[0022] According to one embodiment of the present invention, there is provided an optical laminate comprising: a polymer resin layer; and an optical functional layer formed on one surface of the polymer resin layer and comprising a binder resin and hollow inorganic nanoparticles and solid inorganic nanoparticles dispersed in the binder resin; wherein the volume ratio of zirconium to silicon is less than 2.6 in a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5 nm to 10 nm of the optical functional layer, and the volume ratio of zirconium to silicon is 1.62 or more in a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 50 nm to 150 nm of the optical functional layer.

[0023] When an optical film including an optically functional layer has a low refractive index, the reflectance in the blue color region becomes higher than the reflectance in the green color region, which may cause the film to have a blue color and may result in a degree of opacity or color that is unsuitable for application to polarizing plates, display devices, etc.

[0024] Therefore, the inventors conducted research on optical laminates and confirmed through experiments that an optical functional layer containing hollow inorganic nanoparticles and solid inorganic nanoparticles can achieve low reflectance and haze while improving black visual perception and significantly reducing the degree of blue tint, thereby achieving colorless and transparent properties, by containing silicon elements and zirconium elements in a specific region at a specific volume ratio, thereby completing the invention.

[0025] In addition to the above-mentioned characteristics, the optical laminate has high light transmittance and can simultaneously achieve high scratch resistance and antifouling properties.

[0026] Specifically, in a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5 nm to 10 nm of the optical functional layer, the volume ratio of zirconium element to silicon element can be less than 2.6, 0.5 to 2.0, 1.0 to 1.8, or 1.2 to 1.6.

[0027] In a region from the interface between the polymer resin layer and the optical functional layer to a thickness of 50 nm to 150 nm of the optical functional layer, the volume ratio of zirconium element to silicon element may be 1.62 or more, 1.70 to 2.5, 1.75 to 2.3, or 1.80 to 2.0.

[0028] The volume ratio of zirconium element to silicon element in the above-mentioned region corresponds to the arithmetic mean value of the volume ratio in the above-mentioned region.

[0029] Furthermore, by ensuring that the volume ratio of zirconium to silicon in the above-mentioned region satisfies the above-mentioned range, it is possible to achieve low reflectance while also having colorless and transparent properties, and furthermore, high light transmittance, and high scratch resistance and antifouling properties at the same time.

[0030] When the volume ratio of zirconium to silicon is 2.6 or more in the region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5 nm to 10 nm of the optical functional layer, it is difficult to achieve low reflectance or to exhibit colorless and transparent properties.

[0031] If the volume ratio of zirconium to silicon is less than 1.62 in the region from the interface between the polymer resin layer and the optical functional layer to a thickness of 50 nm to 150 nm of the optical functional layer, it is difficult to achieve low reflectance or to exhibit colorless and transparent properties.

[0032] The optical functional layer included in the optical laminate according to one embodiment of the present invention has high light transmittance and can simultaneously achieve high scratch resistance and antifouling properties by including both hollow inorganic nanoparticles and solid inorganic nanoparticles. Furthermore, the solid inorganic nanoparticles may include both solid silica nanoparticles and solid zirconia nanoparticles. This allows the optical laminate to exhibit low haze while improving black visual perception.

[0033] For example, the optical functional layer includes a binder resin and hollow inorganic nanoparticles, solid silica nanoparticles, and solid zirconia nanoparticles dispersed in the binder resin, and the weight ratio of the solid zirconia nanoparticles to the solid silica nanoparticles can be 10 or more, 15 to 40, 20 to 30, or 23 to 28.

[0034] By including the solid zirconia nanoparticles in a weight ratio of 10 or more to the solid silica nanoparticles, it is possible to simultaneously achieve high scratch resistance and antifouling properties while maintaining high light transmittance, and it is possible to achieve low reflectance and haze while improving the black visual impression and exhibiting colorless and transparent properties.

[0035] On the other hand, if the weight ratio of the solid zirconia nanoparticles to the solid silica nanoparticles is less than 10, the thickness of the particle-mixed layer may increase, which makes it impossible to provide an appropriate refractive index difference, resulting in increased reflectance and haze.

[0036] The optical functional layer may contain a particle-mixed layer having a thickness of 25 to 100 nm, in which both the hollow inorganic nanoparticles and the solid inorganic nanoparticles are present.

[0037] The presence of the particle-mixed layer allows the optical laminate to have colorless and transparent properties while achieving low reflectance, and the inclusion of hollow inorganic nanoparticles and solid inorganic nanoparticles in the optical functional layer allows it to have high light transmittance and simultaneously achieve high scratch resistance and anti-fouling properties.

[0038] Specifically, the optical functional layer may be formed on one surface of the polymer resin layer, and the particle-mixed layer may be located at a distance of 50 nm or more from one surface of the polymer resin layer, or the particle-mixed layer may be located at a distance of 50 nm to 250 nm, or 60 nm to 220 nm, or 70 nm to 200 nm, or 80 nm to 180 nm, or 90 nm to 150 nm, or 100 nm to 120 nm from one surface of the polymer resin layer.

[0039] The particle-mixed layer is positioned at a distance of 50 nm or more from one side of the polymer resin layer, thereby reducing the sharp difference in refractive index between layers within the optical functional layer, and the absolute value of the slope of the reflectance pattern in the short wavelength region of the optical laminate, which has a reflectance of 0.5% or less at a wavelength of 550 nm, is reduced.

[0040] When the particle-mixed layer is located in an area less than 50 nm from one side of the polymer resin layer, the effect of reducing the difference in refractive index between layers within the optical functional layer is limited, and it is therefore not possible to sufficiently determine the absolute value of the slope of the reflectance pattern of an optical laminate having a reflectance of 0.5% or less at a wavelength of 550 nm.

[0041] The distance between the particle-mixed layer and the polymer resin layer is the shortest distance between one surface of the polymer resin layer and the particle-mixed layer based on the surface direction of the polymer resin layer, or may be defined as the thickness of the region between the one surface of the polymer resin layer and the particle-mixed layer.

[0042] The existence of the region between one surface of the polymer resin layer and the particle-mixed layer can be confirmed by ellipsometry. When the ellipticity of the polarization measured by ellipsometry for the particle-mixed layer and the region between one surface of the polymer resin layer and the particle-mixed layer is optimized (fitted) using a Cauchy model, the particle-mixed layer has specific Cauchy parameters A, B, and C, and therefore the particle-mixed layer and the region between one surface of the polymer resin layer and the particle-mixed layer are distinguishable from each other.

[0043] Specifically, the linear polarization of the optical functional layer can be measured in the wavelength range of 380 to 1000 nm using a JA Woollam Co. M-2000 instrument at an incident angle of 70°. The measured linear polarization measurement data (Ψ, Δ) can be fitted to the detailed layers of the optical functional layer using the Cauchy model of General Equation 2 below using Complete EASE software.

[0044]

number

[0045] In the general formula 2, n(λ) is the refractive index at wavelength λ, λ is in the range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.

[0046] Furthermore, by fitting the ellipticity of the polarization measured by ellipsometry to the Cauchy model and the Diffuse Layer Model of General Equation 2, the thickness of the particle-mixed layer and the region between one surface of the polymer resin layer and the particle-mixed layer can be derived, making it possible to define the particle-mixed layer and the region between one surface of the polymer resin layer and the particle-mixed layer within the optical functional layer.

[0047] Furthermore, an optical laminate having a reflectance of 0.5% or less at a wavelength of 550 nm may have a ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm of 5 or more, 5-20, 5.5-15, or 6-12.

[0048] By satisfying the characteristic that the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm is 5 or more, or 5 to 20, or 5.5 to 15, or 6 to 12, the optical laminate can have optical properties in which the reflectance in the blue color region is lower than the reflectance in the green color region, and therefore can have colorless and transparent properties while achieving low reflectance.

[0049] When the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm of the optical laminate having a reflectance of 0.5% or less at a wavelength of 550 nm is less than 5, the optical laminate has a bluish color and is opaque or colored to an extent that it is not suitable for application to a polarizer or a display device. In particular, when the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm is less than 5, the color reproduction ability of an organic light emitting diode display device is reduced.

[0050] The reflectance of the optical laminate at a wavelength of 550 nm may be 0.05% to 5.0%, or 0.06 to 4.0%, or 0.07 to 3.0%, or 0.08% to 0.3%, as long as the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm of the optical laminate, which has a reflectance at a wavelength of 550 nm of 0.5% or less, is 5 or more, or 5 to 20, or 5.5 to 15, or 6 to 12.

[0051] The reflectance of the optical laminate at 400 nm may be 0.5% to 3.50%, or 0.80% to 2.0%.

[0052] The optical laminate may have a characteristic in which the ratio of the reflectance at a wavelength of 700 nm to the reflectance at a wavelength of 550 nm is 5 or more, or 5 to 20, or 6 to 15, or 7 to 12. Therefore, the optical laminate may have an optical characteristic in which the reflectance in the blue color region is lower than the reflectance in the green color region, and therefore may have colorless and transparent characteristics while achieving low reflectance. If the reflectance at a wavelength of 700 nm is excessively high compared to the reflectance at a wavelength of 550 nm, the reflectance in the red light region will be relatively high, and the optical film will appear yellow or red.

[0053] Meanwhile, the optical laminate having a reflectance of 0.5% or less at a wavelength of 550 nm includes a particle-mixed layer having the predetermined thickness within the optical functional layer, and the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm of the optical laminate having a reflectance of 0.5% or less at a wavelength of 550 nm may be 5 or more, or 5 to 20, or 5.5 to 15, or 6 to 12, and therefore the optical laminate may have the characteristic of an absolute value of b* of 4 or less, or 3 or less, or 2 or less, or 1.5 or less in the CIE Lab color space.

[0054] The values ​​in the CIE Lab color space can be measured using a common method for measuring the coordinates of the color space, for example, by placing a spectrophotometer (e.g., CM-2600d, KONICA MINOLTA) having an integral detector at the measurement position and measuring according to the manufacturer's manual. In one example, the coordinates in the CIE Lab color space can be measured with the polarizer or polarizing plate attached to a liquid crystal panel, for example, the high-reflection liquid crystal panel, or can be measured with respect to the polarizer or polarizing plate itself.

[0055] The CIE Lab color space is a color space obtained by nonlinearly transforming the CIE XYZ color space based on the theory of human visual antagonism. In this color space, the L* value indicates brightness, with an L* value of 0 indicating black and an L* value of 100 indicating white. A negative a* value indicates a color biased toward green, while a positive a* value indicates a color biased toward red. A negative b* value indicates a color biased toward blue, while a positive b* value indicates a color biased toward yellow.

[0056] That is, the optical laminate has a characteristic that the absolute value of the b* value in the CIE Lab color space is 4 or less, 3 or less, 2 or less, or 1.5 or less, thereby achieving low reflectance while significantly reducing the degree of reddish or bluish tint, and thus having colorless and transparent properties.

[0057] More specifically, the reflectance of the optical laminate at a wavelength of 550 nm may be 0.5% or less, and while realizing such a low reflectance, the absolute value of the b* value in the CIE Lab color space may be 4 or less, or 3 or less, or 2 or less, or 1.5 or less.

[0058] In this way, by realizing low reflectance and maintaining a low absolute value of the b* value in the CIE Lab color space, the optical laminate can be easily applied to displays with high contrast ratios and brightness, and can achieve performance with high color reproduction.

[0059] In order to have the above-mentioned characteristics of the optical laminate, a particle-mixed layer containing both hollow inorganic nanoparticles and solid inorganic nanoparticles and having a thickness of 25 to 100 nm, or 35 to 90 nm, or 40 to 85 nm, or 50 to 80 nm, or 60 to 75 nm may be present in the optical functional layer.

[0060] If the thickness of the particle-mixed layer is too small, the scratch resistance of the optical functional layer will be reduced, whereas if the thickness of the particle-mixed layer is too large, the optical properties such as the transparency of the optical laminate will be reduced.

[0061] The refractive index and thickness of the particle-mixed layer can be determined by various optical measurement methods, for example, by fitting the ellipticity of polarization measured by ellipsometry to a diffuse layer model.

[0062] The polarization ellipticity and related data (Ψ, Δ) measured by ellipsometry can be measured using commonly known methods and devices. For example, linear polarization can be measured in the wavelength range of 380 to 1000 nm by applying an incident angle of 70° to the particle-mixed layer or other region included in the optical functional layer using a JA Woollam Co. M-2000 device.

[0063] The measured ellipsometry data (Ψ, Δ) can be optimized (fitted) using Complete EASE software by applying a diffuse layer model to the particle-mixed layer and a Cauchy model of the following general formula 2 to the upper and lower layers of the particle-mixed layer, respectively, so that the MSE is 5 or less.

[0064]

number

[0065] In the general formula 2, n(λ) is the refractive index at wavelength λ, λ is in the range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.

[0066] When the thickness and refractive index range of the particle-mixed layer included in the optical functional layer satisfy the above-mentioned range, the sharp difference in refractive index between each layer can be alleviated, and therefore the optical laminate can achieve low reflectance while maintaining a low absolute value of the b* value in the CIE Lab color space.

[0067] Meanwhile, a particle-mixed layer can be formed in the optical functional layer by adjusting the composition of the binder resin contained in the optical functional layer, the type and content of particles, the specific process for forming the optical functional layer (e.g., coating speed, coating method, or drying conditions), and the properties of the polymer resin layer.

[0068] These examples are merely illustrative of methods and means for forming the particle-mixed layer, and the particle-mixed layer is not formed in the optical functional layer only when the methods and means are used simultaneously, but can be adjusted depending on the specific materials forming the optical functional layer and their contents, the thickness of the optical functional layer, the specific materials of the polymer resin layer and their contents, the surface properties and thickness of the polymer resin layer, etc. In other words, the presence of the particle-mixed layer in the optical functional layer and the effects resulting therefrom can be realized based on the description in the specification and the examples.

[0069] For example, the polymer resin layer contained in the optical laminate may contain a binder resin containing a photocurable resin and organic or inorganic fine particles dispersed in the binder resin; and when an optical functional layer containing a binder resin and hollow inorganic nanoparticles and solid inorganic nanoparticles is formed on such a polymer resin layer under specified conditions, the particle-mixed layer may be present.

[0070] Furthermore, the polymer resin layer contained in the optical laminate may have a surface energy of 34 mN / m or more, or 34 mN / m to 60 mN / m, or 35 mN / m to 55 mN / m. When an optical functional layer containing a binder resin, hollow inorganic nanoparticles, and solid inorganic nanoparticles is formed on a polymer resin layer having a surface energy in such a numerical range, the above-mentioned particle-mixed layer may be formed during the process of optimizing the surface energy within the optical functional layer due to the high surface energy of the interface.

[0071] The surface energy of the polymer resin layer can be adjusted by adjusting the surface properties of the polymer resin layer, for example, by adjusting the surface hardness and drying conditions of the polymer resin layer.

[0072] Specifically, the degree of curing of the polymer resin layer can be controlled by adjusting the curing conditions during the formation of the polymer resin layer, such as the amount or intensity of light irradiation, the flow rate of injected nitrogen, etc. For example, the polymer resin layer is formed under nitrogen purging conditions to apply nitrogen atmosphere conditions, and the resin composition forming the polymer resin layer is applied with an irradiation dose of 5 to 100 mJ / cm. 2 , or 10-25mJ / cm 2 This is obtained by irradiating ultraviolet light at an exposure dose of .

[0073] The surface energy is measured by using a commonly known measuring device, for example, a Kruss DSA-100 contact angle measuring device, to measure the contact angles of di-water (Gebhardt) and di-iodomethane (Owens) at 10 points, calculating the average, and then converting the average contact angle into surface energy. Specifically, the surface energy is measured using Dropshape Analysis software, and the contact angle is converted into surface energy by applying the following general formula 1 of the OWRK (Owen, Wendt, Rable, Kaelble) method to the program.

[0074]

number

[0075] As will be described later, the particle-mixed layer is formed by adjusting the drying temperature, air volume, etc. when forming the optical functional layer.

[0076] Specifically, the air volume during the drying process can be adjusted by adjusting the drying conditions, such as the intake or exhaust volume, during the process of forming the optical functional layer. For example, the air volume during the drying process after coating the optical functional layer can be set to 0.5 m / s or more, or 0.5 m / s to 10 m / s, or 0.5 m / s to 8 m / s, or 0.5 m / s to 5 m / s.

[0077] More specifically, the optical functional layer may be formed on one side of the polymer resin layer, and the optical functional layer may contain hollow inorganic nanoparticles and solid inorganic nanoparticles dispersed in a binder resin, and in this case, 50% by volume or more, 60% by volume or more, 70% by volume or more, or any of the above values ​​or less than 95% by volume of the total solid inorganic nanoparticles in the optical functional layer may be present between one side of the polymer resin layer and the particle-mixed layer.

[0078] In this way, since the solid inorganic nanoparticles are mainly distributed in the region from one surface of the polymer resin layer to the particle-mixed layer, the region from one surface of the polymer resin layer to the particle-mixed layer has a refractive index of 1.46 to 1.75 at a wavelength of 550 nm.

[0079] "50% or more by volume of the solid inorganic nanoparticles are present in a specific region" is defined to mean that the majority of the solid inorganic nanoparticles are present in the specific region in the cross section of the optical functional layer, and specifically, 70% or more by volume of the solid inorganic nanoparticles can be confirmed by measuring the volume of the entire solid inorganic nanoparticles.

[0080] For example, the presence of regions in which the solid inorganic nanoparticles and hollow inorganic nanoparticles are primarily distributed can be visually confirmed within the optical functional layer. For example, the presence of individual layers or regions within the optical functional layer can be visually confirmed using a transmission electron microscope or a scanning electron microscope, and the ratio of solid inorganic nanoparticles and hollow inorganic nanoparticles distributed in each layer or region within the optical functional layer can also be confirmed.

[0081] In addition, in the optical functional layer, 50% by volume or more, 60% by volume or more, 70% by volume or more, or the above values ​​or more or 95% by volume or less of the hollow inorganic nanoparticles may be present in the region from the particle-mixed layer to one side of the optical functional layer facing the polymer resin layer. The one side of the optical functional layer facing the polymer resin layer means the other side located in the opposite direction to the side in contact with the polymer resin layer.

[0082] In this way, since the hollow inorganic nanoparticles are mainly distributed in the region from the particle-mixed layer to one surface of the optical functional layer facing the polymer resin layer, the region from the particle-mixed layer to one surface of the optical functional layer facing the polymer resin layer can have a refractive index of 1.0 to 1.40 at a wavelength of 550 nm.

[0083] The optical functional layer of the optical laminate has the above-mentioned particle mixed layer, and solid inorganic nanoparticles are mainly distributed near the interface between the polymer resin layer and the optical functional layer, and hollow inorganic nanoparticles are mainly distributed on the opposite side of the interface, but the areas where the solid inorganic nanoparticles and hollow inorganic nanoparticles are mainly distributed can form independent layers that can be visually confirmed within the optical functional layer.

[0084] Specifically, when solid inorganic nanoparticles are distributed mainly near the interface between the polymer resin layer and the optical functional layer in the optical laminate, and hollow inorganic nanoparticles are distributed mainly on the opposite side of the interface, it is possible to achieve a lower reflectance than the actual reflectance previously obtained using inorganic particles, and to realize both significantly improved scratch resistance and stain resistance.

[0085] In the optical laminate of the above embodiment, the regions in the optical functional layer where solid inorganic nanoparticles and hollow inorganic nanoparticles are unevenly distributed are separated based on the particle-mixed layer, and as a result, the optical laminate has a reflectance of 0.5% or less at a wavelength of 550 nm, and the absolute value of the b* value in the CIE Lab color space is 4 or less, or 3 or less, or 2 or less, or 1.5 or less.As a result, while achieving low reflectance, the degree of blue tint is significantly reduced, allowing it to have colorless and transparent properties.

[0086] In addition, the region from one surface of the polymer resin layer to the particle-mixed layer and the region from the particle-mixed layer to one surface of the optical functional layer facing the polymer resin layer can each be distinguished as individual layers, and as described above, the volume ratios of silicon and zirconium elements distributed in these individual layers can also be distinguished.

[0087] More specifically, when the ellipticity of polarization measured by ellipsometry for the region between one surface of the polymer resin layer and the particle-mixed layer is optimized (fitted) by the Cauchy model of the following general formula 2, the following A is 1.00 to 1.65, B is 0.0010 to 0.0350, and C is 0 to 1*10 -3 Furthermore, in the region between one surface of the polymer resin layer and the particle-containing layer, the following A is 1.25 to 1.55, 1.30 to 1.52, or 1.45 to 1.51, the following B is 0.0010 to 0.0150, 0.0010 to 0.0080, or 0.0010 to 0.0050, and the following C is 0 to 8.0*10 -4 , 0~5.0*10-4 , or 0~4.1352*10 -4 The conditions can be met.

[0088]

number

[0089] In the general formula 2, n(λ) is the refractive index at wavelength λ, λ is in the range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.

[0090] Furthermore, when the ellipticity of polarization measured by ellipsometry in the region from the particle-containing layer to one surface of the optical functional layer facing the polymer resin layer is optimized (fitted) by the Cauchy model of the general formula 2, A is 1.00 to 1.50, B is 0 to 0.007, and C is 0 to 1*10 -3 In addition, in the region from the particle-containing layer to one surface of the optical functional layer facing the polymer resin layer, A is 1.00 to 1.30, 1.00 to 1.20, 1.00 to 1.09, or 1.00 to 1.05, B is 0 to 0.0060, 0 to 0.0055, or 0 to 0.00513, and C is 0 to 8*10 -4 , 0~5.0*10 -4 , or 0~4.8685*10 -4 Meet the conditions.

[0091] Furthermore, when the ellipticity of polarization measured by ellipsometry for the particle-mixed layer is optimized (fitted) by the Cauchy model of the general formula 2, A is 1.100 to 1.200, 1.130 to 1.199, 1.150 to 1.198, or 1.180 to 1.195, B is 0 to 0.007, 0 to 0.006, 0 to 0.005, or 0 to 0.004, and C is 0 to 1*10 -3 , 0~8*10 -4 , 0~5.0*10-4 , or 0~4.8685*10 -4 Meet the conditions.

[0092] On the other hand, the particle-mixed layer, the region from one surface of the polymer resin layer to the particle-mixed layer, and the region from the particle-mixed layer to one surface of the optical functional layer facing the polymer resin layer can each share common optical properties within a single layer, and therefore can be defined as a single layer.

[0093] More specifically, the particle-mixed layer, the region from one surface of the polymer resin layer to the particle-mixed layer, and the region from the particle-mixed layer to one surface of the optical functional layer facing the polymer resin layer each have specific Cauchy parameters A, B, and C when the ellipticity of polarization measured by ellipsometry is fitted to the Cauchy model of General Formula 2, and therefore each region is distinguished from others. Furthermore, the thickness of each region can be derived by fitting the ellipticity of polarization measured by ellipsometry to the Cauchy model of General Formula 2, and therefore each region can be defined within the optical functional layer.

[0094] Meanwhile, the Cauchy parameters A, B, and C derived when the ellipticity of polarization measured by ellipsometry is fitted to the Cauchy model of General Equation 2 may be average values ​​within one region. Therefore, if an interface exists between the regions, the Cauchy parameters A, B, and C of the respective regions overlap. However, even in this case, the thickness and position of each region are determined according to the region that satisfies the average values ​​of the Cauchy parameters A, B, and C of the respective regions.

[0095] On the other hand, whether the hollow inorganic nanoparticles and solid inorganic nanoparticles are present in a specified region is determined by whether the hollow inorganic nanoparticles or solid inorganic nanoparticles are present within the specified region, excluding particles present on the boundary surface of the specified region.

[0096] The optical functional layer including the particle-containing layer may have a low average refractive index of the polymer resin layer, for example, an average refractive index of 1.46 or less, 1.43 or less, 1.40 or less, or 1.39 to 1.30 at a wavelength of 550 nm. Also, the average refractive index of the polymer resin layer may be greater than 1.46, greater than 1.47, or 1.49 to 1.52 at a wavelength of 550 nm.

[0097] Meanwhile, as mentioned above, in the optical functional layer, "the region between one surface of the polymer resin layer and the particle-mixed layer has a refractive index of 1.46 to 1.75 at a wavelength of 550 nm," and "the region from the particle-mixed layer to the surface of the optical functional layer facing the polymer resin layer has a refractive index of 1.0 to 1.40 at a wavelength of 550 nm," but the average refractive index of the optical functional layer refers to the average value of the refractive index of the entire optical functional layer, including these regions and the particle-mixed layer. Similarly, the average refractive index of the polymer resin layer also refers to the average value of the refractive index measured throughout the layer.

[0098] The specific distribution of the solid inorganic nanoparticles and hollow inorganic nanoparticles in the optical functional layer can be obtained by adjusting the drying temperature, drying air volume, drying time, etc. of the photocurable resin composition for forming the optical functional layer containing the above-mentioned nanoparticles in the specific manufacturing method described below, and by the above-mentioned method for forming a particle-mixed layer.

[0099] In order for the optical laminate to have a reflectance of 0.5% or less at a wavelength of 550 nm, when selecting the hollow inorganic nanoparticles and solid inorganic nanoparticles, types having a large difference in refractive index between them are selected.

[0100] More specifically, the difference in density between the solid inorganic nanoparticles and the hollow inorganic nanoparticles is 0.7 to 8.5 g / cm 3 , 0.8~7.5g / cm 3 , 0.9~6.5g / cm 3 , 1.1~5.5g / cm 3 , 1.20~4.5g / cm 3 or 1.24 to 4.27 g / cm 3 It could be.

[0101] If the density difference between the solid inorganic nanoparticles and the hollow inorganic nanoparticles is too large, the solid inorganic nanoparticles may be densely packed in the polymer resin layer and separated from the region where the hollow inorganic nanoparticles are mainly distributed, or an intermediate layer with substantially no particles may be formed between the region where the solid inorganic nanoparticles and the hollow inorganic nanoparticles are mainly distributed. As such, the solid inorganic particles may be concentrated at the interface between the optical functional layer and the polymer resin layer, or the movement and uneven distribution of particles may be uneven during the formation of the optical functional layer, which may result in stains on the surface of the optical functional layer or a significant increase in haze of the optical functional layer, reducing transparency.

[0102] Furthermore, if the difference in density between the solid inorganic nanoparticles and the hollow inorganic nanoparticles is too small, the solid inorganic nanoparticles and the hollow inorganic nanoparticles will not be unevenly distributed, resulting in a significant increase in reflectance or failure to exhibit colorless and transparent properties.

[0103] Therefore, the optical functional layer contained in the optical laminate of one embodiment contains inorganic particles having the density difference described above, has high transmittance, and can simultaneously achieve high scratch resistance and anti-fouling properties, and while achieving low reflectance and haze, can improve black visual perception and have colorless and transparent properties.

[0104] More specifically, the solid inorganic nanoparticles may have a higher density than the hollow inorganic nanoparticles, for example, 1.2 to 10.5 g / cm 3 , 2.0~7.5g / cm 3or 3.0 to 5.5 g / cm 3 and the hollow inorganic nanoparticles have a density of 0.50 g / cm 3 ~2.00g / cm 3 , 0.70g / cm 3 ~1.80g / cm 3 or 1.00 g / cm 3 ~1.60g / cm 3 The density of the granular material may be 0.05 to 0.15.

[0105] Specific examples of the solid inorganic nanoparticles include zirconia, titania, antimony pentoxide, silica, and tin oxide, and may include, for example, solid silica nanoparticles and solid zirconia nanoparticles. In this case, the solid zirconia nanoparticles have a density of 3 to 7 g / cm. 3 or 5-6g / cm 3 The solid silica nanoparticles may have a density of 2 to 4 g / cm 3 or 2.5 to 3.0 g / cm 3 It could be.

[0106] Specific examples of hollow inorganic nanoparticles include hollow silica.

[0107] Meanwhile, the optical functional layer may include a binder resin and hollow inorganic nanoparticles and solid inorganic nanoparticles dispersed in the binder resin.

[0108] The photopolymerizable compound contained in the photocurable coating composition of the above embodiment can form a base material for the binder resin of the optical functional layer to be produced.

[0109] Specifically, the photopolymerizable compound may include a monomer or oligomer containing a (meth)acrylate or vinyl group. More specifically, the photopolymerizable compound may include a monomer or oligomer containing one or more, two or more, or three or more (meth)acrylate or vinyl groups.

[0110] Specific examples of the (meth)acrylate-containing monomer or oligomer include pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tripentaerythritol hepta(meth)acrylate, tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, trimethylolpropane tri(meth)acrylate, trimethylolpropane polyethoxytri(meth)acrylate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, hexaethyl methacrylate, butyl methacrylate, or a mixture of two or more thereof; or a urethane-modified acrylate oligomer, an epoxy acrylate oligomer, an ether acrylate oligomer, a dendritic acrylate oligomer, or a mixture of two or more thereof. In this case, the molecular weight of the oligomer is preferably 1,000 to 10,000.

[0111] Specific examples of the vinyl group-containing monomer or oligomer include divinylbenzene, styrene, and paramethylstyrene.

[0112] The content of the photopolymerizable compound in the photocurable coating composition is not particularly limited, but the content of the photopolymerizable compound in the solid content of the photocurable coating composition may be 5 wt% to 80 wt% in consideration of the mechanical properties of the optical functional layer or optical laminate to be finally produced. The solid content of the photocurable coating composition refers to only the solid components excluding liquid phase components in the photocurable coating composition, such as components such as organic solvents that may be optionally contained as described below.

[0113] The solid inorganic nanoparticles refer to particles having a maximum diameter of 100 nm or less and no empty space inside.

[0114] The hollow inorganic nanoparticles refer to particles having a maximum diameter of 200 nm or less and having empty spaces on the surface and / or inside thereof.

[0115] The solid inorganic nanoparticles can have a diameter of 0.5 to 100 nm, or 1 to 50 nm, or 5 to 30 nm, or 10 to 20 nm.

[0116] The hollow inorganic nanoparticles can have a diameter of 1 to 200 nm, or 10 to 100 nm, or 50 to 120 nm, or 30 to 90 nm, or 40 to 80 nm.

[0117] The diameter of the hollow inorganic nanoparticles may be different from the diameter of the solid inorganic nanoparticles.

[0118] The diameter of the hollow inorganic nanoparticles may be larger than the diameter of the solid inorganic nanoparticles.

[0119] The diameter of each of the solid inorganic nanoparticles and the hollow inorganic nanoparticles refers to the longest diameter of the nanoparticles as seen in cross section.

[0120] Meanwhile, the solid inorganic nanoparticles and the hollow inorganic nanoparticles may each contain one or more reactive functional groups selected from the group consisting of (meth)acrylate groups, epoxide groups, vinyl groups, and thiol groups on their surfaces. By containing the above-mentioned reactive functional groups on the surfaces of the solid inorganic nanoparticles and the hollow inorganic nanoparticles, the optical functional layer can have a higher degree of crosslinking, thereby ensuring improved scratch resistance and stain resistance.

[0121] The optical functional layer can be obtained by applying the photocurable coating composition to a substrate and photocuring the resulting coating. The specific type and thickness of the substrate are not particularly limited, and any substrate known to be used for manufacturing an optical functional layer or an optical laminate can be used without significant limitations.

[0122] The photocurable coating composition can be applied using any method and device commonly used without particular limitations. For example, a bar coating method such as a Meyer bar, a gravure coating method, a two-roll reverse coating method, a vacuum slot die coating method, a two-roll coating method, etc. can be used.

[0123] The optical functional layer may have a thickness of 20 nm to 240 nm, or 50 nm to 200 nm, or 80 nm to 180 nm.

[0124] In the step of photocuring the photocurable coating composition, ultraviolet rays or visible light having a wavelength of 200 to 400 nm may be irradiated, and the exposure dose during irradiation is 100 to 4,000 mJ / cm. 2 The exposure time is also not particularly limited, and can be appropriately changed depending on the exposure device used, the wavelength of the irradiating light, or the exposure dose.

[0125] In addition, in the step of photocuring the photocurable coating composition, nitrogen purging may be performed to apply nitrogen atmosphere conditions.

[0126] On the other hand, the binder resin contained in the optical functional layer may contain a crosslinked (co)polymer between a (co)polymer of a photopolymerizable compound and a fluorine-containing compound having a photoreactive functional group.

[0127] The optical functional layer can be manufactured from a photocurable coating composition containing a photopolymerizable compound, a fluorine-containing compound having a photoreactive functional group, hollow inorganic nanoparticles, solid inorganic nanoparticles, and a photoinitiator. Therefore, the binder resin contained in the optical functional layer can include a crosslinked (co)polymer between a (co)polymer of the photopolymerizable compound and a fluorine-containing compound having a photoreactive functional group.

[0128] The hydrophobicity of the binder resin containing the fluorine-containing compound and the hydrophilicity of the polymer resin layer due to its high surface energy affect the speed at which the fluorine-containing compound moves to the surface of the coating layer during the drying process of the optical laminate. This causes convection in the solvent, and fine particles that were uniformly distributed in the solvent behave differently depending on their particle characteristics. In particular, during this process, each particle can form multiple distinct layers, and when the solvent finishes evaporating during the formation of each layer, the above-mentioned mixed particle layer is formed.

[0129] The surface elevation of the fluorine-containing compound can induce the surface elevation of hollow inorganic nanoparticles, and the solid inorganic nanoparticles, which have a relatively small size, are less affected by this, so phase separation of each particle occurs. During this process, the solvent evaporates and the particle fluidity disappears, resulting in the formation of the above-mentioned mixed layer with a predetermined thickness in the optical functional layer.

[0130] The photopolymerizable compound may further include a fluorine-containing (meth)acrylate monomer or oligomer in addition to the above-mentioned monomer or oligomer. When the photopolymerizable compound further includes the fluorine-containing (meth)acrylate monomer or oligomer, the weight ratio of the fluorine-containing (meth)acrylate monomer or oligomer to the (meth)acrylate or vinyl group-containing monomer or oligomer may be 0.1% to 10%.

[0131] Specific examples of the fluorine-containing (meth)acrylate monomer or oligomer include one or more compounds selected from the group consisting of the following chemical formulas 11 to 15.

[0132] [ka]

[0133] In the above formula 11, R 1 represents a hydrogen group or an alkyl group having 1 to 6 carbon atoms, a represents an integer of 0 to 7, and b represents an integer of 1 to 3.

[0134] [ka]

[0135] In the above Chemical Formula 12, c is an integer of 1 to 10.

[0136] [ka]

[0137] In the above Chemical Formula 13, d is an integer of 1 to 11.

[0138] [ka]

[0139] In the above Chemical Formula 14, e is an integer of 1 to 5.

[0140] [ka]

[0141] In the above Chemical Formula 15, f is an integer of 4 to 10.

[0142] Meanwhile, the optical functional layer may contain a portion derived from the fluorine-containing compound containing the photoreactive functional group.

[0143] The fluorine-containing compound containing a photoreactive functional group may contain or be substituted with one or more photoreactive functional groups, and the photoreactive functional group refers to a functional group that can participate in a polymerization reaction upon irradiation with light, for example, visible light or ultraviolet light. The photoreactive functional group may include various functional groups known to participate in a polymerization reaction upon irradiation with light, and specific examples thereof include a (meth)acrylate group, an epoxide group, a vinyl group, or a thiol group.

[0144] Each of the fluorine-containing compounds having a photoreactive functional group can have a weight average molecular weight (weight average molecular weight measured by GPC in terms of polystyrene) of 2,000 to 200,000, preferably 5,000 to 100,000.

[0145] If the weight-average molecular weight of the fluorine-containing compound having a photoreactive functional group is too small, the fluorine-containing compound will not be uniformly and effectively arranged on the surface of the photocurable coating composition, but will be located inside the optical functional layer that is finally produced. As a result, the stain resistance of the surface of the optical functional layer may be reduced, and the crosslink density of the optical functional layer may be reduced, resulting in reduced mechanical properties such as overall strength and scratch resistance.

[0146] Furthermore, if the weight-average molecular weight of the fluorine-containing compound having a photoreactive functional group is too high, the compatibility with other components in the photocurable coating composition may be low, which may result in an increase in haze or a decrease in light transmittance of the optical functional layer that is finally produced, and the strength of the optical functional layer may also be reduced.

[0147] Specifically, the fluorine-containing compound containing the photoreactive functional group may be i) an aliphatic compound or an aliphatic cyclic compound substituted with one or more photoreactive functional groups and at least one carbon atom substituted with one or more fluorines; ii) a heteroaliphatic compound or a heteroaliphatic cyclic compound substituted with one or more photoreactive functional groups and at least one hydrogen atom substituted with fluorine and at least one carbon atom substituted with silicon; iii) a polydialkylsiloxane polymer (e.g., a polydimethylsiloxane polymer) substituted with one or more photoreactive functional groups and at least one silicon atom substituted with one or more fluorines; iv) a polyether compound substituted with one or more photoreactive functional groups and at least one hydrogen atom substituted with fluorine, or a mixture or copolymer of two or more of the above i) to iv).

[0148] The photocurable coating composition may contain 20 to 300 parts by weight of the fluorine-containing compound having a photoreactive functional group relative to 100 parts by weight of the photopolymerizable compound.

[0149] If the fluorine-containing compound having a photoreactive functional group is added in an excessive amount relative to the photopolymerizable compound, the coating properties of the photocurable coating composition of the embodiment described above will be reduced, and the optical functional layer obtained from the photocurable coating composition will not have sufficient durability or scratch resistance. Also, if the amount of the fluorine-containing compound having a photoreactive functional group relative to the photopolymerizable compound is too small, the optical functional layer obtained from the photocurable coating composition will not have sufficient mechanical properties such as antifouling properties and scratch resistance.

[0150] The fluorine-containing compound having a photoreactive functional group may further contain silicon or a silicon compound, i.e., the fluorine-containing compound having a photoreactive functional group may selectively contain silicon or a silicon compound therein, and specifically, the silicon content in the fluorine-containing compound having a photoreactive functional group may be 0.1 wt % to 20 wt %.

[0151] The silicon contained in the fluorine-containing compound having a photoreactive functional group can increase compatibility with other components contained in the photocurable coating composition of the embodiment, thereby preventing the occurrence of haze in the finally produced refractive layer and improving transparency. On the other hand, if the silicon content in the fluorine-containing compound having a photoreactive functional group is excessively high, the compatibility between the fluorine-containing compound and other components contained in the photocurable coating composition may actually decrease, and as a result, the finally produced optical functional layer or optical laminate may not have sufficient light transmittance or anti-reflection performance, and the surface antifouling properties may also decrease.

[0152] The optical functional layer may contain 10 to 400 parts by weight, 20 to 350 parts by weight, or 50 to 300 parts by weight of the hollow inorganic nanoparticles relative to 100 parts by weight of the (co)polymer of the photopolymerizable compound. Also, the optical functional layer may contain 10 to 400 parts by weight, 20 to 350 parts by weight, or 50 to 300 parts by weight of the solid inorganic nanoparticles relative to 100 parts by weight of the (co)polymer of the photopolymerizable compound.

[0153] If the content of the hollow inorganic nanoparticles and solid inorganic nanoparticles in the optical functional layer is too high, phase separation between the hollow inorganic nanoparticles and the solid inorganic nanoparticles does not occur sufficiently during the manufacturing process of the optical functional layer, resulting in a high reflectance and a decrease in antifouling properties due to excessive surface irregularities. Also, if the content of the hollow inorganic nanoparticles and solid inorganic nanoparticles in the optical functional layer is too low, it is difficult for a large number of the solid inorganic nanoparticles to be located in the region close to the interface between the polymer resin layer and the optical functional layer, resulting in a very high reflectance of the optical functional layer.

[0154] The hollow inorganic nanoparticles and the solid inorganic nanoparticles may be contained in the composition in the form of colloids dispersed in a predetermined dispersion medium. The colloids containing the hollow inorganic nanoparticles and the solid inorganic nanoparticles may contain an organic solvent as the dispersion medium.

[0155] The content of each of the hollow inorganic nanoparticles and solid inorganic nanoparticles in the colloid can be determined taking into consideration the content range of each of the hollow inorganic nanoparticles and solid inorganic nanoparticles in the photocurable coating composition, the viscosity of the photocurable coating composition, etc. For example, the solid content of each of the hollow inorganic nanoparticles and solid inorganic nanoparticles in the colloid can be 5 wt % to 60 wt %.

[0156] Here, examples of the organic solvent in the dispersion medium include alcohols such as methanol, isopropyl alcohol, ethylene glycol, and butanol; ketones such as methyl ethyl ketone and methyl isobutyl ketone; aromatic hydrocarbons such as toluene and xylene; amides such as dimethylformamide, dimethylacetamide, and N-methylpyrrolidone; esters such as ethyl acetate, butyl acetate, and γ-butyrolactone; ethers such as tetrahydrofuran and 1,4-dioxane; and mixtures thereof.

[0157] The photopolymerization initiator can be any compound known to be usable in photocurable resin compositions without significant limitations. Specifically, benzophenone-based compounds, acetophenone-based compounds, biimidazole-based compounds, triazine-based compounds, oxime-based compounds, or mixtures of two or more of these compounds can be used.

[0158] The photopolymerization initiator is used in an amount of 1 to 100 parts by weight per 100 parts by weight of the photopolymerizable compound. If the amount of the photopolymerization initiator is too small, uncured residue may be generated during the photocuring step of the photocurable coating composition. If the amount of the photopolymerization initiator is too large, unreacted initiator may remain as an impurity or the crosslinking density may be low, resulting in poor mechanical properties and excessively high reflectance of the produced film.

[0159] Meanwhile, the photocurable coating composition may further include an organic solvent.

[0160] Non-limiting examples of the organic solvent include ketones, alcohols, acetates and ethers, or a mixture of two or more thereof.

[0161] Specific examples of such organic solvents include ketones such as methyl ethyl ketone, methyl isobutyl ketone, acetylacetone, and isobutyl ketone; alcohols such as methanol, ethanol, diacetone alcohol, n-propanol, i-propanol, n-butanol, i-butanol, and t-butanol; acetates such as ethyl acetate, i-propyl acetate, and polyethylene glycol monomethyl ether acetate; ethers such as tetrahydrofuran and propylene glycol monomethyl ether; and mixtures of two or more of these.

[0162] The organic solvent may be added when mixing the components of the photocurable coating composition, or may be added in a state where the components are dispersed or mixed in the organic solvent. If the content of the organic solvent in the photocurable coating composition is too low, the flowability of the photocurable coating composition may be reduced, resulting in defects such as streaks in the final film. Furthermore, if the organic solvent is added in an excessive amount, the solids content may be reduced, which may result in insufficient coating and film formation, resulting in reduced physical properties and surface characteristics of the film and defects during the drying and curing process. Therefore, the photocurable coating composition may contain an organic solvent such that the total solids concentration of the components contained therein is 1 wt % to 50 wt %, or 2 wt % to 20 wt %.

[0163] Meanwhile, the optical laminate of the above embodiment can be provided by a method for producing an optical laminate, which includes the steps of: applying a resin composition for forming an optical functional layer, which contains a photocurable compound or its (co)polymer, a fluorine-containing compound having a photoreactive functional group, a photoinitiator, hollow inorganic nanoparticles, and solid inorganic nanoparticles, onto a polymer resin layer; and drying the resin composition at a temperature of 35°C to 100°C; and photocuring the dried resin composition.

[0164] The optical functional layer can be formed by applying a resin composition for forming an optical functional layer, which contains a photocurable compound or its (co)polymer, a fluorine-containing compound having a photoreactive functional group, a photoinitiator, hollow inorganic nanoparticles, and solid inorganic nanoparticles, onto a polymer resin layer and drying the composition at a temperature of 35°C to 100°C, or 40°C to 80°C.

[0165] If the temperature for drying the resin composition for forming an optical functional layer coated on the polymer resin layer is less than 35° C., the stain resistance of the resulting optical functional layer may be significantly reduced. Also, if the temperature for drying the resin composition for forming an optical functional layer coated on the polymer resin layer is more than 100° C., phase separation between the hollow inorganic nanoparticles and the solid inorganic nanoparticles may not occur sufficiently during the manufacturing process of the optical functional layer, resulting in a mixture of the hollow inorganic nanoparticles and the solid inorganic nanoparticles, which not only reduces the scratch resistance and stain resistance of the optical functional layer but also significantly increases the reflectance.

[0166] In the process of drying the resin composition for forming an optical functional layer coated on the polymer resin layer, the optical functional layer having the above-mentioned properties can be formed by adjusting the drying temperature and the density difference between the solid inorganic nanoparticles and the hollow inorganic nanoparticles.

[0167] Meanwhile, the step of drying the resin composition for forming the optical functional layer coated on the polymer resin layer at a temperature of 35° C. to 100° C. is carried out for 10 seconds to 5 minutes, or 30 seconds to 4 minutes.

[0168] If the drying time is too short, the phase separation between the solid inorganic nanoparticles and the hollow inorganic nanoparticles described above does not occur sufficiently, whereas if the drying time is too long, the formed optical functional layer erodes the polymer resin layer.

[0169] The polymer resin layer may have a thickness of 0.1 μm to 100 μm.

[0170] An example of the polymer resin layer is a polymer resin layer containing a binder resin including a photocurable resin and organic or inorganic fine particles dispersed in the binder resin.

[0171] The photocurable resin contained in the polymer resin layer may be a polymer of a photocurable compound that can undergo a polymerization reaction when irradiated with light such as ultraviolet light, and may be a polymer commonly used in the art. Specifically, the photocurable resin may include at least one selected from the group consisting of reactive acrylate oligomers, such as urethane acrylate oligomers, epoxy acrylate oligomers, polyester acrylates, and polyether acrylates; and the group consisting of polyfunctional acrylate monomers, such as dipentaerythritol hexaacrylate, dipentaerythritol hydroxypentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylenepropyl triacrylate, propoxylated glycerol triacrylate, trimethylpropaneethoxy triacrylate, 1,6-hexanediol diacrylate, propoxylated glycerotriacrylate, tripropylene glycol diacrylate, and ethylene glycol diacrylate.

[0172] The particle size of the organic or inorganic particles is not specifically limited, but for example, the organic particles may have a particle size of 1 to 10 μm, and the inorganic particles may have a particle size of 1 nm to 500 nm, or 1 nm to 300 nm. The particle size of the organic or inorganic particles may be defined as a volume average particle size.

[0173] Furthermore, the organic or inorganic fine particles contained in the polymer resin layer are not limited to specific examples, but may be, for example, organic fine particles made of acrylic resin, styrene resin, epoxy resin, or nylon resin, or inorganic fine particles made of silicon oxide, titanium dioxide, indium oxide, tin oxide, zirconium oxide, or zinc oxide.

[0174] The binder resin of the polymer resin layer may further include a high molecular weight (co)polymer having a weight average molecular weight of 10,000 or more.

[0175] The high molecular weight (co)polymer may be at least one selected from the group consisting of cellulose-based polymers, acrylic-based polymers, styrene-based polymers, epoxide-based polymers, nylon-based polymers, urethane-based polymers, and polyolefin-based polymers.

[0176] Meanwhile, another example of the polymer resin layer is a polymer resin layer containing a binder resin of a photocurable resin and an antistatic agent dispersed in the binder resin.

[0177] The photocurable resin contained in the polymer resin layer may be a polymer of a photocurable compound that can undergo a polymerization reaction when irradiated with light such as ultraviolet light, which is a common polymer in the art. Preferably, however, the photocurable compound may be a polyfunctional (meth)acrylate monomer or oligomer, and in this case, the number of (meth)acrylate functional groups is 2 to 10, preferably 2 to 8, and more preferably 2 to 7, which is advantageous in terms of ensuring the physical properties of the polymer resin layer. More preferably, the photocurable compound may be one or more selected from the group consisting of pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol hepta(meth)acrylate, tripentaerythritol hepta(meth)acrylate, tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, trimethylolpropane tri(meth)acrylate, and trimethylolpropane polyethoxytri(meth)acrylate.

[0178] The antistatic agent may be a quaternary ammonium salt compound; a pyridinium salt; a cationic compound having one to three amino groups; an anionic compound such as a sulfonate group, a sulfate group, a phosphate group, or a phosphonate group; an amphoteric compound such as an amino acid or aminosulfate compound; a nonionic compound such as an imino alcohol compound, a glycerin compound, or a polyethylene glycol compound; an organometallic compound such as a metal alkoxide compound containing tin or titanium; a metal chelate compound such as an acetylacetonate salt of the organometallic compound; a reaction product or polymer of two or more of these compounds; or a mixture of two or more of these compounds. The quaternary ammonium salt compound may be a compound having one or more quaternary ammonium groups in the molecule, and may be in either a low molecular weight or high molecular weight form.

[0179] Conductive polymers and metal oxide particles can also be used as the antistatic agent. Examples of conductive polymers include aromatic conjugated poly(paraphenylene), heterocyclic conjugated polypyrrole and polythiophene, aliphatic conjugated polyacetylene, heteroatom-containing conjugated polyaniline, mixed-type conjugated poly(phenylene vinylene), multi-chain conjugated compounds with multiple conjugated chains in the molecule, and conductive composites in which conjugated polymer chains are grafted or block copolymerized to saturated polymers. Examples of metal oxide particles include zinc oxide, antimony oxide, tin oxide, cerium oxide, indium tin oxide, indium oxide, aluminum oxide, antimony-doped tin oxide, and aluminum-doped zinc oxide.

[0180] The polymer resin layer containing the photocurable binder resin and the antistatic agent dispersed in the binder resin may further contain one or more compounds selected from the group consisting of alkoxysilane oligomers and metal alkoxide oligomers.

[0181] The alkoxysilane compound may be a compound commonly used in the art, but is preferably one or more compounds selected from the group consisting of tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methacryloxypropyltrimethoxysilane, glycidoxypropyltrimethoxysilane, and glycidoxypropyltriethoxysilane.

[0182] The metal alkoxide oligomer can be produced by a sol-gel reaction of a composition containing a metal alkoxide compound and water, which can be carried out by a method similar to the method for producing the alkoxysilane oligomer described above.

[0183] However, since the metal alkoxide compound may react rapidly with water, the sol-gel reaction can be carried out by diluting the metal alkoxide compound in an organic solvent and then slowly dropping water into the solution. In this case, taking into consideration the reaction efficiency, it is preferable to adjust the molar ratio of the metal alkoxide compound to water (based on metal ions) within the range of 3 to 170.

[0184] Here, the metal alkoxide compound may be one or more compounds selected from the group consisting of titanium tetraisopropoxide, zirconium isopropoxide, and aluminum isopropoxide.

[0185] The optical laminate may further include a light-transmitting substrate layer formed on the other side of the polymer resin layer so as to face the optical functional layer.

[0186] The light-transmitting substrate layer may have a transmittance of 50% or more, 75% or more, 85% or more, or 95% or more at wavelengths of 300 nm or more.

[0187] The light-transmitting substrate layer may include a transparent plastic resin, such as a polyester resin, a cellulose resin, a polycarbonate resin, an acrylic resin, a styrene resin, a polyolefin resin, a polyimide resin, a polyethersulfone resin, or a sulfone resin, and the like, and a mixture of two or more of these may be used.

[0188] More specifically, the light-transmitting substrate layer may include at least one of polyethylene terephthalate (PET), cyclic olefin copolymer (COC), polyacrylate (PAC), polycarbonate (PC), polyethylene (PE), polymethylmethacrylate (PMMA), polyetheretherketone (PEEK), polyethylene naphthalate (PEN), polyetherimide (PEI), polyimide (PI), polyamideimide (PAI), and triacetylcellulose (TAC).

[0189] Meanwhile, the light-transmitting substrate layer may be a single layer or a multi-layer structure of two or more layers made of the same or different materials. For example, the support substrate may be a multi-layer structure of polyethylene terephthalate (PET), a multi-layer structure formed by co-extrusion of polymethyl methacrylate (PMMA) / polycarbonate (PC), or a single-layer structure including a copolymer of polymethyl methacrylate (PMMA) and polycarbonate (PC).

[0190] Furthermore, the light-transmitting substrate layer may be subjected to a plasma surface treatment if necessary, and the method for the treatment is not particularly limited and may be carried out by a conventional method.

[0191] In addition, if the thickness of the light-transmitting substrate layer is too thick or too thin, problems such as reduced surface hardness and impact resistance or folding characteristics may occur, so it is preferable to set the thickness range appropriately. For example, the light-transmitting substrate may have a thickness of 20 to 200 μm, 30 to 150 μm, or 50 to 120 μm.

[0192] According to another embodiment of the present invention, there is provided a polarizing plate including the optical laminate.

[0193] The polarizing plate may include a polarizer and an optical laminate formed on at least one surface of the polarizer.

[0194] The material and manufacturing method of the polarizer are not particularly limited, and ordinary materials and manufacturing methods known in the art can be used. For example, the polarizer can be a polyvinyl alcohol-based polarizer.

[0195] The polarizer and the optical laminate are laminated together with an adhesive such as a water-based adhesive or a non-water-based adhesive.

[0196] According to yet another embodiment of the invention, a display device including the optical laminate described above can be provided.

[0197] Specific examples of the display device are not limited to, and may include, for example, a liquid crystal display device, a plasma display device, an organic light emitting diode (OLED) display device, a flexible display device, and the like.

[0198] In the display device, the optical laminate is provided on the outermost surface of the display panel on the viewer side or the backlight side.

[0199] In a display device including the optical laminate, the optical laminate may be disposed on one surface of a pair of polarizing plates that is relatively far from a backlight unit.

[0200] The display device may include a display panel, a polarizer provided on at least one surface of the panel, and an optically functional layer provided on the opposite surface of the polarizer that contacts the panel.

[0201] According to yet another embodiment of the present invention, there is provided an organic light emitting diode display device including the optical stack.

[0202] Generally, an organic light-emitting diode display device has high resolution and high color reproducibility. However, an optical stack having a high color value, for example, an absolute value of b* in the CIE Lab color space exceeding 4, reduces the color reproducibility of the organic light-emitting diode display device.

[0203] In contrast, the optical laminate of the embodiment can achieve high transmittance and low reflectance, while also having a low color value with an absolute value of b* of 4 or less in the CIE Lab color space, thereby providing colorless transparency. As a result, the color reproducibility of an organic light emitting diode display device can be maintained or improved. [Effects of the Invention]

[0204] According to the present invention, an optical laminate having high light transmittance, high scratch resistance, and antifouling properties, and having low reflectance and colorless transparency, a polarizing plate, a display device, and an organic light-emitting diode display device including the same can be provided. [Brief explanation of the drawings]

[0205] [Figure 1] 1 is a photograph of a cross section of the optical laminate of Example 1 taken with a transmission electron microscope (TEM). [Figure 2]1 is a TEM-EDS map photograph of silicon element and zirconium element in a cross section of the optical laminate of Example 1. [Figure 3] 1 is a photograph of a cross section of the optical laminate of Comparative Example 1 taken with a transmission electron microscope. [Figure 4] 1 is a TEM-EDS map photograph of silicon element and zirconium element in a cross section of the optical laminate of Comparative Example 1. [Figure 5] 1 is a photograph of a cross section of the optical laminate of Comparative Example 2 taken with a transmission electron microscope. [Figure 6] 1 is a TEM-EDS map photograph of silicon element and zirconium element in a cross section of the optical laminate of Comparative Example 2. [Figure 7] 1 is a graph showing the reflectance for each wavelength in Example 1, Comparative Example 1, and Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0206] The present invention will be described in more detail in the following examples, but the following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0207] Manufacturing Example 1: Manufacturing of polymer resin layer The solid content of LAS-1467KR (Toyo-ink Co., Ltd.) was diluted with cyclohexanone solvent to a solid content concentration of 40 wt % to prepare a coating solution for forming a polymer resin layer. The diluted coating solution for forming a polymer resin layer was coated on a triacetyl cellulose film using a #10 Mayer bar, and the ultraviolet intensity was 25 mJ / cm. 2 The coating was dried at room temperature and then photocured under a nitrogen purge to produce a polymer resin layer having a thickness of 4 μm.

[0208] Example 1: Preparation of optical laminate (1) Production of photocurable coating composition for producing optical functional layer Hollow silica nanoparticles (diameter: approximately 70-80 nm, density: 1.41 g / cm) were used for 100 parts by weight of trimethylolpropane ethoxy triacrylate (M3190, MIWON Co., Ltd.).3 , JSC Catalyst and Chemicals) 297 parts by weight, solid zirconia nanoparticles (diameter: approximately 11 nm, density: 5.68 g / cm 3 1326 parts by weight of solid silica nanoparticles (diameter: approximately 10-15 nm, density: 2.65 g / cm 3 , Nissan Chemical Co., Ltd.), 51.75 parts by weight of a silane coupling agent (KBM-503, ShinEtsu Silicone Co., Ltd.), 146 parts by weight of a first fluorine-containing compound (KY-1207, ShinEtsu Co., Ltd.), 183 parts by weight of a second fluorine-containing compound (RS-4137, Aekyung Chemical Co., Ltd.), and 12.9 parts by weight of an initiator (SPI-02, Samyang Co., Ltd.) were diluted to a solids concentration of 8% by weight in a solvent obtained by mixing methyl isobutyl ketone (MIBK): diacetone alcohol (DAA): isopropyl alcohol (IPA): methyl ethyl ketone (MEK): ethanol (EtOH) in a weight ratio of 26.32:6.12:24.23:25.33:9.49.

[0209] (2) Manufacturing of optical functional layers and optical laminates The photocurable coating composition obtained above was coated onto the polymer resin layer of Preparation Example 1 using a #4 Mayer bar to a thickness of about 150 nm, and dried at an air speed of 0.5 m / s or more and at a temperature of 90°C for 1 minute, followed by ultraviolet light at an intensity of 254 mJ / cm. 2 The mixture was cured at RT under a nitrogen purge.

[0210] <Comparative Example: Production of Optical Laminate>

[0211] Comparative Example 1 An optical laminate was prepared in the same manner as in Example 1, except that solid silica nanoparticles were not used in the photocurable coating composition for preparing the optical functional layer, and 1,440 parts by weight of solid zirconia nanoparticles were used.

[0212] Comparative Example 2 An optical laminate was prepared in the same manner as in Example 1, except that 145 parts by weight of solid silica nanoparticles and 1,133 parts by weight of solid zirconia nanoparticles were used in the photocurable coating composition for preparing an optical functional layer.

[0213] <Experimental example: Measurement of physical properties of optical laminates> The optical laminates obtained in the above Examples and Comparative Examples were subjected to the following experiments, and the results are shown in Table 1 below.

[0214] 1. The volume ratio of zirconium to silicon in the optical functional layer For the optical functional layers obtained in each of the examples and comparative examples, thin sections were prepared using a microtome, and then STEM EDS map analysis was performed using a transmission electron microscope (TEM, product name: H-7650) in FETEM bright field mode (accelerating voltage: 100 kV).

[0215] The volumes of silicon (Si) and zirconium (Zr) elements in the optical functional layer obtained by the above analysis were quantified using the OPEN-CV program in terms of the number of pixels occupied by each element relative to the total number of pixels.

[0216] Using the resulting data quantifying the volume of each element in the optical functional layer, the volume ratio (arithmetic mean value) of zirconium (Zr) element to silicon (Si) element was calculated within the "region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5nm to 10nm of the optical functional layer" and the "region from the interface between the polymer resin layer and the optical functional layer to a thickness of 50nm to 150nm of the optical functional layer."

[0217] 2. Measurement of surface energy of polymer resin layer The surface energy of each polymer resin layer in the Examples and Comparative Examples was measured by measuring the contact angles of di-water (Gebhardt) and di-iodomethane (Owens) at 10 points using a Kruss DSA-100 contact angle measuring device, calculating the average, and then converting the average contact angle into surface energy. The surface energy was measured using Dropshape Analysis software, and the contact angle was converted into surface energy by applying the following general equation 1 of the OWRK (Owen, Wendt, Rable, Kaelble) method to the program.

[0218]

number

[0219] 3. Measurement of the average reflectance of the optical laminate and the a and b* values ​​in the CIE Lab color space The reflectance, a value, and b* value at each wavelength in the visible light region (380-780 nm) of the optical laminates obtained in the examples and comparative examples were measured using a Solidspec 3700 (Shimadzu) device. The test specimens were scanned from 380 to 780 nm to measure the reflectance at each wavelength, and then the average reflectance, a value, and b* value were calculated using the UV-2401PC Color Analysis program.

[0220] 4. Scratch resistance measurement The surfaces of the optical laminates obtained in the Examples and Comparative Examples were rubbed with a load applied to steel wool (#0000) at a speed of 27 rpm 10 times. The maximum load required to produce a single scratch of 1 cm or less visible to the naked eye was measured.

[0221] 5. Ellipsometry Measurements The ellipticity of polarization was measured by ellipsometry for the optical functional layers obtained in the examples and comparative examples.

[0222] Specifically, the optical functional layers obtained in the examples and comparative examples were measured for linear polarization in the wavelength range of 38 to 1000 nm at an incident angle of 70° using a JA Woollam Co. M-2000 device. The measured linear polarization measurement data (ellipsometry data (Ψ, Δ)) was fitted to the optical functional layers using Complete EASE software using the Cauchy model of the following general formula 2 so that the MSE was 3 or less.

[0223]

number

[0224] In the general formula 1, n(λ) is the refractive index at wavelength λ, λ is in the range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.

[0225] 6. Reflectance Measurement For the particle-containing layers contained in the optical functional layers obtained in the examples and comparative examples, the reflectance was calculated at wavelengths of 550 nm, 400 nm, and 700 nm using elliptically polarized light measured at wavelengths of 380 nm to 1,000 nm and the Cauchy model.

[0226] 7. Haze Measurement A 4 cm x 4 cm test piece was prepared from the optical laminate obtained in the examples and comparative examples, and the haze was measured three times using a haze measuring device (HM-150, A light source, Murakami Co., Ltd.) to calculate the average value, which was then used as the overall haze value. At this time, the haze was measured according to JIS K 7136 standard.

[0227] 8. Evaluation of black visibility The optical laminates obtained in the examples and comparative examples were evaluated for black visual impression based on the CIE lab color space and haze values.

[0228] <Evaluation criteria> Good: CIE lab a* and b* absolute values ​​are less than 2 and less than 3, respectively, and the haze value (JIS K7136 standard) is less than 0.6%. Degradation: The absolute values ​​of CIE lab a* and b* are 2 or more and 3 or more, respectively, or the haze value (JIS K7136 standard) is 0.6% or more.

[0229] [Table 1]

[0230] As shown in Table 1, the optical functional layer of Example 1, in which the volume ratio of zirconium to silicon is less than 2.6 in the region from the interface between the polymer resin layer and the optical functional layer to a thickness of 5 nm to 10 nm of the optical functional layer, and the volume ratio of zirconium to silicon is 1.62 or more in the region from the interface to a thickness of 50 nm to 150 nm of the optical functional layer, has been confirmed to have colorless and transparent properties, with low color values ​​of a* and b* with absolute values ​​of 2 or less in the CIE Lab color space, while achieving a reflectance of 0.2% or less at a wavelength of 550 nm.

[0231] Furthermore, it was confirmed that the optical laminate of the example contains a particle-mixed layer having a thickness of 25 to 100 nm in the optical functional layer, and is phase-separated so that regions where hollow inorganic nanoparticles and solid inorganic nanoparticles are mainly distributed are separated, and as described above, has low color values ​​with absolute values ​​of a* and b* of 2 or less in the CIE Lab color space, and thus has colorless and transparent properties, while also achieving good black visual perception and excellent scratch resistance.

[0232] In contrast, the comparative examples did not satisfy the volume ratio of zirconium to silicon in the above-mentioned region. As a result, Comparative Example 1 did not use solid silica particles, resulting in a reddish color due to the absolute value of a* exceeding 2 in the CIE Lab color space of the optical laminate, and a high haze value reduced the black luminance and therefore reduced scratch resistance. Furthermore, Comparative Example 2 was divided into regions where hollow inorganic nanoparticles and solid inorganic nanoparticles were primarily distributed, without uneven distribution (phase separation), and instead had an excessively thick particle-mixed layer located too close to the polymer resin layer. As a result, the absolute value of b* exceeded 2, resulting in a bluish color and a degree of opacity (high haze) or coloration that made it unsuitable for use in polarizing plates or display devices.

Claims

1. a polymeric resin layer; and an optical functional layer formed on one surface of the polymer resin layer, a particle-mixed layer containing both hollow inorganic nanoparticles and solid inorganic nanoparticles is present in the optical functional layer; The solid inorganic nanoparticles include solid silica nanoparticles and solid zirconia nanoparticles; the particle-containing layer has a thickness of 25 to 100 nm and is located at a distance of 50 nm or more from the interface between the polymer resin layer and the optical functional layer; The optical functional layer has a thickness of 80 nm to 240 nm.

2. When the ellipticity of polarization measured by ellipsometry for the particle-mixed layer is optimized (fitted) by the Cauchy model of the following general formula 2, A is 1.100 to 1.200, B is 0 to 0.007, and C is 0 to 1×10 －３ The optical laminate according to claim 1, [Equation 1] In the general formula 2, n(λ) is the refractive index at wavelength λ, λ being in the range of 300 nm to 1800 nm, and A, B, and C are Cauchy parameters.

3. The optical laminate according to claim 1 , wherein the optical laminate has a reflectance of 0.5% or less at a wavelength of 550 nm.

4. The optical laminate according to claim 1 , wherein the ratio of the reflectance at a wavelength of 400 nm to the reflectance at a wavelength of 550 nm of the optical laminate is 5 or more.

5. 2. The optical laminate according to claim 1, wherein the weight ratio of the solid zirconia nanoparticles to the solid silica nanoparticles contained in the optical functional layer is 10 or more.

6. The optical laminate according to claim 1 , wherein the polymer resin layer has a surface energy of 34 mN / m or more.

7. 2. The optical laminate according to claim 1, wherein a region between one surface of the polymer resin layer and the particle-mixed layer has a refractive index of 1.46 to 1.75 at a wavelength of 550 nm.

8. 2. The optical laminate according to claim 1, wherein a region from the particle-containing layer to one surface of the optical functional layer facing the polymer resin layer has a refractive index of 1.0 to 1.40 at a wavelength of 550 nm.

9. the solid inorganic nanoparticles have a diameter of 0.5 to 100 nm; 2. The optical laminate according to claim 1, wherein the hollow inorganic nanoparticles have a diameter of 1 to 200 nm.

10. 2. The optical laminate according to claim 1, wherein the difference in density between the solid inorganic nanoparticles and the hollow inorganic nanoparticles is 0.7 to 8.5 g / cm<3>.

11. 2. The optical laminate according to claim 1, wherein the optical functional layer comprises a binder resin and hollow inorganic nanoparticles and solid inorganic nanoparticles dispersed in the binder resin, and the binder resin contained in the optical functional layer comprises a crosslinked (co)polymer between a (co)polymer of a photopolymerizable compound and a fluorine-containing compound having a photoreactive functional group.

12. The optical laminate according to claim 1 , wherein the polymer resin layer comprises a binder resin containing a photocurable resin and organic or inorganic fine particles dispersed in the binder resin.

13. The optical laminate according to claim 1 , further comprising a light-transmitting substrate layer formed on the other side of the polymer resin layer so as to face the optical functional layer.

14. A polarizing plate comprising the optical laminate according to claim 1 and a polarizer.

15. A display device comprising the optical laminate of claim 1.

16. An organic light emitting diode display device comprising the optical stack of claim 1.

Images