Optical laminates and displays including them

Abstract

The present invention relates to an optical laminate comprising a base layer and an absorption layer, which uniformly absorbs light across the entire wavelength range of visible light, resulting in good hue, ensuring visibility, preventing glare, and providing excellent light resistance. The invention also provides an optical laminate and a display, automobile, or building fixture incorporating the same.

Description

Technical Field

[0001] The present invention relates to an optical laminate, a display, an automobile or a building fixture including the same.

Background Art

[0002] Generally, an external light blocking coating is often applied to the glass window of a moving means such as a vehicle. However, the glass window of a conventional moving means has a fixed transmittance, and the external light blocking coating also has a fixed transmittance. Therefore, the overall transmittance of such a conventional moving means window is fixed, which may induce an accident.

[0003] For example, when the overall transmittance is set low, there is no problem during the daytime when the amount of light in the surroundings is sufficient, but in cases such as at night when the amount of light in the surroundings is not sufficient, there is a problem that it is only difficult for a driver or the like to properly check the surroundings of the moving means. Or when the overall transmittance is set high, there is a problem that it may cause glare to a driver or the like during the daytime when the amount of light in the surroundings is sufficient.

[0004] Also, an external light blocking coating is often applied to the glass window of a building or the like for the efficiency of air conditioning and energy saving. In this case, if the transmittance is fixed, there is a problem that it is not efficient in energy saving, similar to the case of a moving means.

[0005] Therefore, the development of an absorption film that controls the transmittance to sunlight has been carried out, but a conventional absorption film has a tendency to have a high absorption rate in a specific wavelength region of short wavelength or long wavelength among visible light rays, and there is a problem that it cannot uniformly absorb all wavelength regions of visible light rays.

[0006] Also, there is a problem that when continuously exposed to sunlight, the film is discolored and deformed by external factors such as heat and humidity, and it is difficult to maintain the film characteristics.

[0007] Korean Published Patent No. 10-2014-0103461 discloses a film containing an inorganic compound and a shielding layer that blocks visible light and near-infrared rays, but it still has the problem of not being able to uniformly absorb all wavelengths of visible light.

[0008] Therefore, there is a need for the development of optical components that can be applied to displays, buildings, or vehicles, ensuring visibility, uniformly absorbing light across the entire wavelength range of visible light to prevent glare, and exhibiting excellent light resistance. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] Korean Published Patent No. 10-2014-0103461 [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention aims to improve upon the problems of the prior art and to provide an optical laminate that uniformly absorbs light across the entire wavelength range of visible light, has good hue, ensures visibility, prevents glare, and has excellent light resistance.

[0011] Furthermore, the present invention aims to provide a display, an automobile, or a building component that includes the optical laminate. [Means for solving the problem]

[0012] To achieve the above objectives, the present invention aims to provide an optical laminate comprising a base layer and an absorption layer, having a total light transmittance (Tt) of 50 to 70%, a difference of 10% or less between the transmittance at a wavelength of 450 nm and the transmittance at a wavelength of 550 nm, a difference of 10% or less between the transmittance at a wavelength of 550 nm and the transmittance at a wavelength of 650 nm, and a difference of 10% or less between the transmittance at a wavelength of 450 nm and the transmittance at a wavelength of 650 nm.

[0013] The present invention also provides an optical laminate in which the difference between the maximum and minimum transmittance values ​​is 10% or less in the 450nm to 550nm wavelength range, the difference between the maximum and minimum transmittance values ​​is 10% or less in the 550nm to 650nm wavelength range, and the difference between the maximum and minimum transmittance values ​​is 10% or less in the 450nm to 650nm wavelength range.

[0014] In the present invention, the thickness of the optical laminate may be 20 to 100 μm.

[0015] In the present invention, the absorption layer may be a cured product of a curable resin composition containing a binder resin, carbon nanotubes, and a solvent.

[0016] In this invention, the carbon nanotubes may be present in an amount of 1 to 10 parts by weight per 100 parts by weight of the binder resin, based on the solid content.

[0017] In this invention, the carbon nanotubes may have a diameter of 1 to 1000 nm and an average particle size of 100 to 1000 nm.

[0018] The present invention may further include an adhesive layer in the optical laminate.

[0019] Furthermore, the present invention aims to provide a display, an automobile, or a building component that includes the optical laminate. [Effects of the Invention]

[0020] The present invention provides an optical laminate that uniformly absorbs light across the entire wavelength range of visible light, resulting in good hue, ensuring visibility, preventing glare, and exhibiting excellent light resistance.

[0021] Furthermore, the present invention can provide a display, an automobile, or a building component including the optical laminate. [Brief explanation of the drawing]

[0022] [Figure 1] Figure 1 is a graph showing the results of measuring the transmittance by wavelength for the optical laminate according to the examples and comparative examples of the present invention in a 25 mm transmission mode with an integrating sphere reflectance (CM-3700A, Konica Minolta).

Mode for Carrying Out the Invention

[0023] The present invention provides an optical laminate including a base material layer and an absorption layer, having an average transmittance in the wavelength range of 450 nm to 650 nm of 50 to 70%, a difference between the transmittance at 450 nm wavelength and the transmittance at 550 nm wavelength of 10% or less, a difference between the transmittance at 550 nm wavelength and the transmittance at 650 nm wavelength of 10% or less, and a difference between the transmittance at 450 nm wavelength and the transmittance at 650 nm wavelength of 10% or less.

[0024] Hereinafter, embodiments of the present invention will be described more specifically. The terms used in this specification are for explaining the embodiments and are not intended to limit the present invention.

[0025] <Optical Laminate> The present invention is an optical laminate including a base material layer and an absorption layer that blocks external light and preferably has a total light transmittance (Total Transmittance, Tt) of 50 to 70% so as not to cause a problem in visibility.

[0026] In particular, the optical laminate of the present invention is characterized in that the difference between the transmittance at 450 nm wavelength and the transmittance at 550 nm wavelength is 10% or less, the difference between the transmittance at 550 nm wavelength and the transmittance at 650 nm wavelength is 10% or less, and the difference between the transmittance at 450 nm wavelength and the transmittance at 650 nm wavelength is 10% or less. Thereby, since light is uniformly absorbed in all wavelength ranges of visible light, it is possible to exhibit a unique neutral hue without showing red or blue.

[0027] Furthermore, the optical laminate of the present invention may have a difference of 10% or less between the maximum and minimum transmittance in the 450 nm to 550 nm wavelength range, a difference of 10% or less between the maximum and minimum transmittance in the 550 nm to 650 nm wavelength range, and a difference of 10% or less between the maximum and minimum transmittance in the 450 nm to 650 nm wavelength range. As a result, since the difference in transmittance in each wavelength region is not large, it is possible to provide an optical laminate that uniformly absorbs visible light in the wavelength bands of the said regions.

[0028] The transmittance of the present invention described above is based on a thickness of 20 to 100 μm for the optical laminate, and the optical laminate of the present invention may have a thickness of 20 to 100 μm.

[0029] If the thickness of the optical laminate is less than 20 μm, it may become prone to tearing, and if the thickness exceeds 100 μm, it may result in an increase in the thickness and weight of the final product.

[0030] The optical laminate of the present invention satisfies the transmittance in the visible light wavelength range described above and satisfies the difference in transmittance at a specific wavelength, so when applied to a display, automobile, or building fixture, it can block external light, ensure visibility, and prevent glare.

[0031] Base material layer The substrate layer of the present invention may be a film with excellent transparency, mechanical strength, thermal stability, moisture shielding properties, isotropy, etc. Specific examples include films made of thermoplastic resins such as polyester resins like polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; cellulosic resins like diacetylcellulose and triacetylcellulose; polycarbonate resins; acrylate resins like polymethyl (meth)acrylate and polyethyl (meth)acrylate; styrene resins like polystyrene and acrylonitrile-styrene copolymers; polyolefin resins like polyethylene, polypropylene, polyolefins having a cyclo- or norbornene structure, and ethylene-propylene copolymers; vinyl chloride resins; arylate resins; polyoxymethylene resins; and epoxy resins. Films made of blends of the above thermoplastic resins can also be used. Furthermore, films made of thermosetting resins or UV-curing resins such as (meth)acrylic, urethane, acrylic urethane, epoxy, and silicone can also be used.

[0032] In one embodiment, the base layer may have a thickness of 15 μm to 95 μm. If the thickness of the base layer is less than 15 μm, problems such as inability to properly support the laminated absorption layer may occur, and if the thickness exceeds 95 μm, the excessive thickness will lead to an increase in the overall thickness of the laminate, which may cause problems such as a decrease in the transmittance or flexibility of the optical laminate.

[0033] Absorption layer The absorbent layer of the present invention is formed on one or both sides of the substrate layer and is a layer having the function of satisfying the aforementioned transmittance, and can be formed by curing a curable resin composition for forming an absorbent layer. The curable resin composition for forming an absorbent layer may be, for example, a curable resin composition containing a binder resin, carbon nanotubes and a solvent, as described later, and the curable resin composition may further contain additives as needed.

[0034] The binder resin may include a thermosetting binder resin or a photocurable binder resin.

[0035] The thermosetting binder resin can be a water-soluble binder or a solvent-type binder resin. Such binder resins may be, but are not limited to, those selected from the group consisting of acrylic, urethane, urethane-acrylic, ester, ether, epoxy, polyimide, polyamide, polyether resins, polyolefin resins, and melamine resins, either individually or in mixtures thereof.

[0036] The photocurable binder resin may contain photocurable (meth)acrylate oligomers and monomers.

[0037] The aforementioned photocurable (meth)acrylate oligomer typically uses epoxy (meth)acrylate, urethane (meth)acrylate, etc., with urethane (meth)acrylate being more preferred.

[0038] The urethane (meth)acrylate can be produced in the presence of a catalyst as a polyfunctional (meth)acrylate having a hydroxyl group in the molecule and a compound having an isocyanate group. Specific examples of the (meth)acrylate having a hydroxyl group in the molecule may be one or more selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 2-hydroxyisopropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, caprolactone ring-opened hydroxyacrylate, pentaerythritol tri / tetra(meth)acrylate mixture, and dipentaerythritol penta / hexa(meth)acrylate mixture. Furthermore, specific examples of compounds having the isocyanate group include 1,4-diisocyanate butane, 1,6-diisocyanate hexane, 1,8-diisocyanate octane, 1,12-diisocyanate dodecane, 1,5-diisocyanate-2-methylpentane, trimethyl-1,6-diisocyanate hexane, 1,3-bis(isocyanate methyl)cyclohexane, trans-1,4-cyclohexane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), isophorone diisocyanate, and One or more may be selected from the group consisting of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, xylene-1,4-diisocyanate, tetramethylxylene-1,3-diisocyanate, 1-chloromethyl-2,4-diisocyanate, 4,4'-methylenebis(2,6-dimethylphenyl isocyanate), 4,4'-oxybis(phenyl isocyanate), trifunctional isocyanates derived from hexamethylene diisocyanate, and trimethanepropanol adductotoluene diisocyanate.

[0039] The aforementioned monomers are commonly used and have an unsaturated group such as a (meth)acryloyl group, vinyl group, styryl group, or allyl group as a photocurable functional group within the molecule, among which the (meth)acryloyl group is more preferred.

[0040] The monomers having the (meth)acryloyl group include, as specific examples, neopentyl glycol acrylate, 1,6-hexanediol (meth)acrylate, propylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, 1,2,4-cyclohexanetetra(meth)acrylate, pentagrycerol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, and dipentaerythritol tri(meth)acrylate. One or more may be selected from the group consisting of dipentaerythritol penta(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, tripentaerythritol tri(meth)acrylate, tripentaerythritol hexa(meth)acrylate, bis(2-hydroxyethyl)isocyanurate di(meth)acrylate, hydroxyethyl(meth)acrylate, hydroxypropyl(meth)acrylate, hydroxybutyl(meth)acrylate, isooctyl(meth)acrylate, iso-dexyl(meth)acrylate, stearyl(meth)acrylate, tetrahydrofurfuryl(meth)acrylate, phenoxyethyl(meth)acrylate, and isoboneol(meth)acrylate.

[0041] The photocurable (meth)acrylate oligomers and monomers described above can each be used individually or in combination of two or more.

[0042] The content of the binder resin is not particularly limited, but may be 1 to 80% by weight, preferably 1 to 50% by weight, relative to the total weight of the curable resin composition for forming the absorption layer. If it is less than 1% by weight, problems may occur with the adhesion between the substrate and the coating layer, and if it exceeds 80% by weight, problems may occur where the viscosity of the composition becomes high and the coating properties decrease.

[0043] The curable resin composition for forming an absorption layer of the present invention may contain carbon nanotubes.

[0044] The carbon nanotube may have a tubular shape formed by winding a graphite plate-like structure, in which hexagonal rings made of six carbon atoms are linked together.

[0045] The carbon nanotubes exhibit excellent mechanical properties, and when applied to optical laminates, they may increase hardness. Furthermore, since the carbon nanotubes do not decompose when exposed to ultraviolet light or heat, they may increase the weather resistance and light resistance of the optical laminates.

[0046] The method for producing the carbon nanotubes is not particularly limited and may be produced by methods known in the art, such as chemical vapor deposition, arc discharge, plasma torch, and ion bombardment. For example, the carbon nanotubes may be produced by arc discharge.

[0047] The specific structure of the carbon nanotube is not particularly limited, and may be either a single-walled carbon nanotube (SWCNT) or a multi-walled carbon nanotube (MWCNT), with multi-walled carbon nanotubes (MWCNT) being more preferred.

[0048] According to one embodiment of the present invention, the carbon nanotube may have a diameter of 1 to 1000 nm, preferably 10 to 500 nm.

[0049] If the diameter of the carbon nanotubes is less than 1 nm, problems may arise with absorption efficiency, and if it exceeds 1000 nm, the transmittance of the optical laminate may decrease.

[0050] Furthermore, the carbon nanotubes may have an average particle size of 100 to 1000 nm. Due to the properties of carbon nanotubes, linear measurement is difficult, so the average particle size can be measured using a particle size analyzer in the same manner as for dispersed particles, reflecting the free twisting state in the liquid phase.

[0051] If the average particle size of the carbon nanotubes is less than 100 nm, it is difficult to achieve the transmittance of the optical laminate of the present invention as described above. If the average particle size of the carbon nanotubes exceeds 1000 nm, the haze may increase due to scattering, or the nanotubes may not be able to pass through the filter, potentially leading to a significant decrease in coating performance.

[0052] The carbon nanotubes may be present in amounts of 1 to 10 parts by weight per 100 parts by weight of the binder resin, based on the solid content. If the solid content of the carbon nanotubes is less than 1 part by weight per 100 parts by weight of the binder resin solid content, problems with absorption efficiency may occur, and if it exceeds 10 parts by weight, problems with low transmittance may occur.

[0053] The curable resin composition for forming an absorbent layer of the present invention may contain a solvent, and the solvent can dissolve or disperse the components contained in the aforementioned curable resin composition for forming an absorbent layer, and is not limited to any solvent known in the art for compositions for forming coating layers.

[0054] Preferably usable solvents include alcohol-based solvents such as methanol, ethanol, isopropanol, butanol, methyl cellosolve, and ethyl cellosolve; ketone-based solvents such as methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, and cyclohexanone; acetate-based solvents such as ethyl acetate, propyl acetate, normal butyl acetate, tert-butyl acetate, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol monomethyl ethyl acetate, propylene glycol monoethyl ethyl acetate, propylene glycol monopropyl ethyl acetate, methoxybutyl acetate, and methoxypentyl acetate; hexane-based solvents such as hexane, heptane, and octane; benzene-based solvents such as benzene, toluene, and xylene; and ether-based solvents such as diethylene glycol dimethyl ethyl Each of the solvents described above can be used individually or in combination of two or more.

[0055] For example, when the binder resin is a polyimide resin, good solvents for it include acetone, methyl ethyl ketone, cyclopentanone, and ethyl acetate, while poor solvents include alcohols such as isopropyl alcohol, butanol, and ethanol, and ethers such as butyl acetate and propylene glycol methyl ether.

[0056] Preferably, a good solvent alone or a mixed solvent consisting of a good solvent and a poor solvent is used as the solvent. The good solvent and the poor solvent can be appropriately selected depending on the material of the binder resin.

[0057] Such solvents can be used in an amount of 10 to 95% by weight relative to the total weight of the curable resin composition for forming the absorption layer. If the solvent content is less than the above amount, the viscosity may be high, potentially reducing workability, and the dispersion of carbon nanotubes may not be sufficient. Furthermore, if the solvent content exceeds the above range, the drying process will take a long time, reducing economic efficiency, and haze may occur.

[0058] The curable resin composition for forming an absorption layer of the present invention may further contain additives such as labeling agents that provide smoothness and coating properties to the coating film, as needed.

[0059] Examples of the labeling agents include silicone-based labeling agents, fluorine-based labeling agents, and acrylic polymer-based labeling agents, which can be used individually or in combination of two or more. The labeling agent may be included in an amount of 0.1 to 1% by weight relative to the total weight of the curable resin composition for forming the absorption layer, but is not limited thereto.

[0060] The curable resin composition for forming an absorption layer of the present invention may further contain other additives such as ultraviolet stabilizers and heat stabilizers, in addition to the labeling agent.

[0061] In one embodiment of the present invention, the absorption layer may have a thickness of 0.5 to 5 μm. When the thickness of the absorption layer satisfies the above range, it is preferable because it can appropriately satisfy the transmittance for each wavelength that is the objective of the present invention. More specifically, if the thickness of the absorption layer is less than 0.5 μm, the absorption efficiency fluctuates greatly despite minute thickness deviations, making it difficult to obtain uniform transmittance, and if the thickness exceeds 5 μm, the economic practicality decreases.

[0062] <Displays, automobiles, or building fixtures> The present invention includes a display comprising the optical laminate.

[0063] The aforementioned display is not limited to one that includes the optical laminate, but may also include a smart window.

[0064] The display may include configurations commonly known in the art, except that it includes the optical laminate described above.

[0065] Furthermore, the present invention includes means of transport including the optical laminate, for example, an automobile to which the smart window is applied to at least one of the front window, rear window, side window, sunroof window, and interior partition, a wearable device including the optical laminate, and building fixtures.

[0066] [Examples] The present invention will be described in more detail below through examples. However, the following examples are provided to illustrate the present invention more specifically, and the scope of the present invention is not limited by these examples.

[0067] Manufacturing Examples 1 to 10: Production of curable resin compositions for forming absorbent layers A curable resin composition for forming an absorption layer was prepared using the composition shown in Table 1 below.

[0068] [Table 1]

[0069] -Carbon nanotube dispersion: TCI-07 (solid content 1.5%, carbon nanotube diameter <10nm, average particle size: 300nm, manufactured by Nanochemtech) -Polythiophene dispersion: SEPLEGYDA SAS-PE-H02A (5.5% solids content, manufactured by Shin-etsu Polymer Co., Ltd.) - Binder resin composition: DW-10F (solids content 21.6%, urethane-based, manufactured by Nanochemtech Co., Ltd.) - Labeling agent: BYK-UV3530 (100% solids, manufactured by BYK) - Solvent: Isopropyl alcohol Examples 1 to 6 and Comparative Examples 1 to 4: Manufacturing of Optical Laminates The curable resin compositions for forming the absorption layer described in Production Examples 1 to 10 were coated onto a triacetylcellulose (25 μm TAC, manufactured by HYOSUNG) substrate layer so that the cured thickness would be as shown in Table 1. The optical laminates of the Examples and Comparative Examples were then heat-cured at 80°C for 3 minutes, and the physical properties of the manufactured optical laminates were measured as follows, as shown in Table 2 below.

[0070] Experimental example (1) Transmittance The total light transmittance (Tt) of the optical laminates of the examples and comparative examples was measured using a haze meter HM-150N (Murakami Co., Ltd.), and the results are shown in Table 2 below. In addition, the transmittance at 450 nm, 550 nm, and 650 nm was measured using an integrating sphere reflectance analyzer (CM-3700A, Konica Minolta) in 25 mm transmission mode, and the results are shown in Figure 1. The difference in transmittance at each wavelength was calculated, and the results are shown in Table 2.

[0071] (2) Hue The transmittance at 450 nm, 550 nm, and 650 nm was measured for the optical laminates of the examples and comparative examples using an integrating sphere reflectance analyzer (CM-3700A, Konica Minolta) in 25 mm transmission mode. The hue was evaluated according to the following evaluation criteria and is shown in Table 2 below.

[0072] <Evaluation Criteria> ○: Satisfies all of the following conditions (neutral hue) ×: Does not satisfy any of the following conditions │550nm~450nm transmittance│≦10% │650nm~550nm transmittance│≦10% │650nm~450nm transmittance│≦10% (3) Evaluation of lightfastness For the optical laminates of the examples and comparative examples, the initial transmittance was measured using a UV-2600 (Shimadzu Corporation), and then the laminates were placed in a UV AUTO Fademeter (Suga Corporation, model name U48AU) for 120 hours. Changes in transmittance and film appearance were then observed and evaluated according to the following evaluation criteria, as shown in Table 2 below.

[0073] <Evaluation Criteria> ○: No change in transmittance or appearance.

[0074] ×: Transmittance and appearance may change.

[0075] (4) Glare The total light transmittance (Tt) of the optical laminates of the examples and comparative examples was measured using a haze meter HM-150N (manufactured by Murakami Co., Ltd.), and the degree of glare was evaluated according to the evaluation criteria below. The results are shown in Table 2 below.

[0076] <Evaluation Criteria> ○: Total light transmittance (Tt) is 70% or less ×: Total light transmittance (Tt) exceeds 70% (5) Visibility The total light transmittance (Tt) of the optical laminates of the examples and comparative examples was measured using a haze meter HM-150N (manufactured by Murakami Co., Ltd.), and the degree of visibility was evaluated according to the evaluation criteria below. The results are shown in Table 2 below.

[0077] <Evaluation Criteria> ○: Total light transmittance (Tt) is 50% or higher ×: Total light transmittance (Tt) is less than 50% (6) Hayes The haze was measured for the optical laminates of the examples and comparative examples using a haze meter HM-150N (manufactured by Murakami Co., Ltd.), and the results are shown in Table 2 below.

[0078] (7) Adhesion With the absorbent layer facing upwards, the substrate layer was bonded to the glass using a transparent adhesive. Then, 100 squares were scratched into the absorbent layer at 1 mm intervals using a utility knife. Three adhesion tests were then performed using Nichiban tape, and the results of the adhesion tests according to the evaluation criteria below are shown in Table 2.

[0079] <Evaluation Criteria> 0B: More than 65% peeling 1B: 35% to less than 65% peeling 2B: 15% to less than 35% peeling 3B: 5% to less than 15% peeling 4B: Less than 5% peeling 5B: Unpeeled

[0080] [Table 2]

[0081] Referring to the results in Table 2 above, it can be confirmed that the optical laminate according to the embodiment of the present invention, which satisfies a total light transmittance (Tt) of 50 to 70%, has a difference of 10% or less between the transmittance at 450 nm wavelength and the transmittance at 550 nm wavelength, a difference of 10% or less between the transmittance at 550 nm wavelength and the transmittance at 650 nm wavelength, and a difference of 10% or less between the transmittance at 450 nm wavelength and the transmittance at 650 nm wavelength, exhibits excellent hue, lightfastness, visibility, and glare.

[0082] Furthermore, referring to the results in Figure 1, it can be confirmed that the optical laminate according to the embodiment of the present invention satisfies the following conditions: the difference between the maximum and minimum transmittance is 10% or less in the 450nm to 550nm wavelength range, the difference between the maximum and minimum transmittance is 10% or less in the 550nm to 650nm wavelength range, and the difference between the maximum and minimum transmittance is 10% or less in the 450nm to 650nm wavelength range. By uniformly absorbing visible light in the wavelength bands of the aforementioned regions, it is confirmed that the hue is good, visibility is ensured, and glare can be prevented. [Industrial applicability]

[0083] [Industrial applicability] The present invention provides an optical laminate that uniformly absorbs light across the entire wavelength range of visible light, resulting in good hue, ensuring visibility, preventing glare, and exhibiting excellent light resistance.

Claims

1. It includes a base layer and an absorbent layer, The total light transmittance (Tt) is between 50 and 70%. An optical laminate in which the difference between the transmittance at a wavelength of 450 nm and the transmittance at a wavelength of 550 nm is 10% or less, the difference between the transmittance at a wavelength of 550 nm and the transmittance at a wavelength of 650 nm is 10% or less, and the difference between the transmittance at a wavelength of 450 nm and the transmittance at a wavelength of 650 nm is 10% or less.

2. The optical laminate according to claim 1, wherein the difference between the maximum and minimum transmittance is 10% or less in the wavelength range of 450 nm to 550 nm, the difference between the maximum and minimum transmittance is 10% or less in the wavelength range of 550 nm to 650 nm, and the difference between the maximum and minimum transmittance is 10% or less in the wavelength range of 450 nm to 650 nm.

3. The optical laminate according to claim 1, wherein the optical laminate has a thickness of 20 to 100 μm.

4. The optical laminate according to claim 1, wherein the absorption layer is a cured product of a curable resin composition comprising a binder resin, carbon nanotubes, and a solvent.

5. The optical laminate according to claim 4, wherein the carbon nanotubes are present in 1 to 10 parts by weight per 100 parts by weight of the binder resin, based on the solid content.

6. The optical laminate according to claim 4, wherein the carbon nanotubes have a diameter of 1 to 1000 nm and an average particle size of 100 to 1000 nm.

7. The optical laminate according to claim 1, further comprising an adhesive layer.

8. A display comprising an optical laminate according to any one of claims 1 to 7.

9. An automobile comprising at least one of the following: a front window, a rear window, a side window, a sunroof window, and an interior partition, the optical laminate described in any one of claims 1 to 7.

10. A building fixture comprising an optical laminate according to any one of claims 1 to 7.

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