Optical laminate, polarizing lens, and eyewear

Abstract

The present invention relates to an optical laminate (100, 110) comprising a first support (10), a second support (10), and a polarizing element (20) disposed between the first support (10) and the second support (10). The polarizing element (20) includes one or more dyestuff-based dichroic dyes having a dichroic ratio (Rd) of 38 or more at the maximum absorption wavelength (λmax). Furthermore, the optical laminate (100, 110) has a luminosity-corrected transmittance (Ys) of 43% to 55%, and a luminosity-corrected polarization degree (Py) of 78% to 85%.

Description

Optical laminate, polarized lens and eyewear

[0001] The present invention relates to an optical laminate for eyewear that includes a polarizing element, and to a polarized lens and eyewear (sunglasses, goggles, etc.) that use the same.

[0002] BACKGROUND ART So-called eyewear such as sunglasses and goggles use tinted lenses to add fashionability and anti-glare properties, and also use lenses with a polarizing function to provide even higher anti-glare properties.

[0003] Polarized lenses utilize the polarization phenomenon to transmit only polarized light compared to non-polarized light, i.e., they have a polarizing function. Eyewear equipped with polarized lenses (commonly referred to as polarized sunglasses), particularly when used outdoors, not only attenuates direct light from external sources, but also blocks the transmission of light reflected by diffuse reflection (horizontally polarized, also referred to as S-polarized light) and transmits only vertically polarized light (also referred to as P-polarized light) (reflected light suppression function, also referred to as anti-glare), thereby reducing glare and providing clear vision even in the presence of reflected light or in backlit conditions. Eyewear with such a polarizing function can be used not only for sports and leisure activities, but also when driving a car, etc., ensuring sufficient visibility and anti-glare properties, thereby increasing safety.

[0004] A typical known method for manufacturing polarized sunglasses is to produce polarized lenses by injection molding an optical laminate having a base film and a polarizing film (also called a bare polarizing film) together with a resin material that will become the lenses, and then processing the polarized lenses to fit them into eyewear frames (Patent Document 1).

[0005] In recent years, automobiles have begun to be equipped with head-up display devices (hereinafter also referred to as HUD devices). According to Patent Document 2, for example, HUD devices can display information from instruments on an instrument panel by projecting the information as image light onto the windshield, allowing the driver of the automobile to drive while gazing ahead through the windshield and visually confirming the information. This reduces the need for eye movement, and is expected to improve drivability and ultimately safety.

[0006] In general, such HUD devices emit S-polarized (horizontally polarized) image light from the display unit and reflect the image light off the windshield, causing the driver of the vehicle to view the S-polarized light reflected off the windshield as the displayed image. Therefore, if the driver is wearing polarized sunglasses, the vibration direction of the S-polarized light in the image displayed by the HUD device may overlap with the absorption axis direction of the polarizing layer of the polarized sunglasses, blocking the displayed image and making it impossible to see. This phenomenon is commonly referred to as "blackout."

[0007] As a measure to prevent the blackout phenomenon, for example, Patent Document 3 discloses a technology to change the polarization state in the light path by combining an optical film within the HUD device, thereby avoiding the blackout phenomenon. However, this is not a simple measure because it makes the device design complicated and expensive.

[0008] Furthermore, the performance of conventional polarized sunglasses is generally classified into lens categories 0 to 4 in the international standard for polarized sunglasses, ISO 12312-1:2013 (hereinafter simply referred to as the "international standard for sunglasses"). Here, τv represents luminous transmittance, and Pe represents polarization efficiency. Explanation label: Light-tinted sunglasses Lens category 0: τv>80% Lens category 1: 43%<τv≦80% Pe≧60% Explanation label: General-purpose sunglasses Lens category 2: 18%<τv≦43% Pe≧78% Lens category 3: 8%<τv≦18% Pe≧78% Explanation label: Special-purpose sunglasses Lens category 4: 3%<τv≦8% Pe≧78%

[0009] It is possible to avoid blackouts by using so-called "tinted" eyewear (τv greater than 43% and corresponding to lens categories 0 and 1) that has high transmittance and little or no polarization effect. However, such eyewear does not have anti-glare properties against reflected light, so darker colors are required to reduce glare, raising concerns about driving safety. For example, Patent Document 4 discloses the use of a low-polarization film using a dye pigment with a low dichroic ratio to prevent hue changes in polarized films during lens processing. However, with such an embodiment, even though it has a glare-reducing function due to its low transmittance, it has difficulty achieving the desired anti-glare properties due to its low ability to block reflected external light.

[0010] When wearing polarized sunglasses for general outdoor use during the day or for driving a car, sunglasses with lens categories 2 and 3, which have a high Pe, are considered to be suitable for their high anti-glare effect, but if the anti-glare effect is excessively high, there is a possibility that a blackout phenomenon will occur in the image displayed by the HUD device. Furthermore, because τv is kept low, there are concerns about visibility of the scenery while driving, which could impair safety. On the other hand, sunglasses with lens category 1 have a high τv and a low Pe, so while they can be expected to provide good visibility of the scenery and reduce the blackout phenomenon of the HUD device, they do not provide sufficient anti-glare properties for polarized sunglasses.

[0011] Furthermore, Patent Document 5 considers preventing the blackout phenomenon of images on automobile displays, including HUD devices, by providing a quarter-wave plate layer or a superrefractive polyester film layer on the outside of an optical laminate used in polarized sunglasses. However, although image blackout is prevented, when S-polarized light (also called reflected light) from outside enters the quarter-wave plate layer or superrefractive polyester film layer of the optical laminate, the S-polarized light is converted into elliptically polarized light, causing the polarizing element to fail to function, and preventing glare that is required when driving to reduce the glare of reflected light is not obtained.

[0012] Japanese Patent Publication No. 8-313701 Japanese Patent Publication No. 2003-295105 International Publication No. 2022 / 250032 International Publication No. 2014 / 115705 Chinese Utility Model No. 216210293

[0013] As such, in conventional polarized sunglasses, there is a trade-off between polarization function and transmittance, and there is a need for the development of polarized sunglasses that simultaneously provide scenery visibility and anti-glare properties suitable for driving a car, as well as visibility of the display image projected from the HUD device (hereinafter referred to as display visibility).

[0014] In view of the above problems, the present invention aims to provide an optical laminate that ensures the display visibility of a HUD device and maintains the anti-glare properties of polarized sunglasses even when worn as polarized sunglasses in a vehicle equipped with a HUD device, as well as polarized lenses and eyewear using the same.

[0015] As a result of extensive research to solve the above problems, the inventors discovered that by using an optical laminate that exhibits high natural light transmittance, a high degree of polarization, and a high polarized light orthogonal transmittance, it is possible to produce polarized sunglasses that have anti-glare properties without impairing the display visibility of a HUD device, and thus completed the present invention.

[0016] An optical laminate according to an embodiment of the present invention comprises a first support, a second support, and a polarizing element disposed between the first support and the second support, wherein the polarizing element contains one or more dye-based dichroic pigments having a dichroic ratio (Rd) of 38 or greater at a maximum absorption wavelength (λmax), and the optical laminate has a luminosity-corrected transmittance (Ys) of 43% or greater and 55% or less, and a luminosity-corrected polarization degree (Py) of 78% or greater and 85% or less.

[0017] A polarized lens according to an embodiment of the present invention comprises a lens substrate and the above-described optical laminate.

[0018] Eyewear according to an embodiment of the present invention includes the above-described polarized lens.

[0019] According to the present invention, it is possible to provide an optical laminate that ensures the visibility of the display of a HUD device even when polarized sunglasses are worn in a vehicle equipped with a HUD device, and that can maintain the anti-glare properties of polarized sunglasses, as well as polarized lenses and eyewear that use the same.

[0020] Fig. 1 is a schematic diagram showing an example of one embodiment of an optical laminate according to the present invention. Fig. 2 is a schematic diagram showing an example of another embodiment of an optical laminate according to the present invention. Fig. 3 is a schematic diagram showing an example of shaping (bending) processing of an optical laminate according to the present invention. Fig. 4 is a schematic diagram showing an apparatus for sensory evaluation of display visibility of an optical laminate according to the present invention.

[0021] Hereinafter, embodiments according to the present invention will be described in detail. Note that the following embodiments are examples of some typical embodiments of the present invention, and various modifications can be made within the scope of the present invention. Furthermore, "high natural light transmittance," "high transmittance," and "high transmittance" each mean that the luminous efficiency-corrected transmittance Ys (=τv) is greater than 43%. Furthermore, the term "lower" in the lower alkyl group, lower alkoxy group, and lower alkylamino group means that each group has 1 to 4 carbon atoms.

[0022] The optical laminate of the present invention, and the polarized lenses and eyewear using the same, ensure display visibility of the image displayed by a HUD device in an automobile equipped with the HUD device when worn by a driver of the automobile, and are also provided with anti-glare properties against external light.

[0023] In one embodiment, the optical laminate of the present invention includes a dye-based polarizing element containing at least one dichroic dye-based dichroic pigment having a dichroic ratio (Rd) of 38 or greater. Such dye-based polarizing elements exhibit both high transmittance and a high degree of polarization (e.g., Py = 83% or greater at Ys = 49%), which could not be achieved with dye-based dichroic pigments used in conventional polarized sunglasses. Furthermore, dye-based polarizing elements exhibit minimal hue change or degradation of optical properties under the thermal load applied during lens processing, and furthermore, possess high polarization performance, allowing them to be designed with higher transmittance. Generally, when iodine-based polarizing elements are designed with high transmittance (especially Ys = 45% or greater), the formation of iodine complexes that exhibit polarization performance in the polarizing element tends to become unstable. Such iodine-based polarizing elements are vulnerable to heat and moisture, making them unsuitable for lens processing and, furthermore, less reliable during long-term eyewear use.

[0024] A dichroic dye refers to a dye that, when oriented on an alignment substrate or the like, exhibits different absorbance in the long axis direction of the molecule and absorbance in the short axis direction. The dichroic ratio (Rd) is expressed as the ratio of the absorbance (Ax) in the direction of maximum transmission of linearly polarized light incident thereon to the absorbance (Az) in the direction perpendicular to the maximum transmission direction, according to the following mathematical formula (I). The higher this value, the better the polarization characteristics. Rd can usually be determined by preparing a polarizing element oriented under conditions that allow the dye to be maximally oriented on the alignment substrate, and then by spectroscopic measurement. A PVA-based resin film can typically be used as the alignment substrate.

[0025] Rd=Az / Ax (I)

[0026] By applying an optical laminate containing the dye-based polarizing element described above to polarized lenses and eyewear, such polarized lenses and eyewear, in one embodiment, can satisfy the luminous transmittance (43% < τv ≦ 80%) of Lens Category 1 of the International Standard for Sunglasses and the polarization efficiency (Pe ≧ 78%) of Lens Category 2. In other words, this means that while having high transmittance as polarized sunglasses, they also have high polarization efficiency and combine scenery visibility and anti-glare properties. Therefore, by using an optical laminate that can impart such optical properties in polarized lenses and eyewear, particularly in automobiles equipped with HUD devices, the displayed image is not completely blocked by the optical laminate, ensuring a bright and moderate display visibility of the displayed image. Furthermore, since sufficient polarization properties are maintained despite the high transmittance, it is also effective in preventing glare from external light, providing a safe driving environment.

[0027] The international standard for sunglasses is a standard for personal protective equipment. The standard outlines the labeling requirements for general-use sunglasses lenses, including the luminous transmittance (τv), polarization efficiency (Pe), and lens classification, as outlined above.

[0028] <Optical Laminate> Fig. 1 shows one embodiment of an optical laminate according to the present invention. As shown in Fig. 1, the optical laminate 100 includes two supports (a first support and a second support) 10 and a polarizing element 20 disposed between the two supports 10. The optical laminate 100 also includes two adhesive layers 30 between each support 10 and the polarizing element 20, and the components are arranged in the following order from the external light incident side: first support / adhesive layer / polarizing element / adhesive layer / second support. That is, the polarizing element 20 is arranged so as to be interposed between the two supports (the first support and the second support) 10 via the adhesive layers 30.

[0029] 2, an optical laminate 110 optionally further includes a support 10, which is arranged in the following order from the external light incident side: first support / adhesive layer / polarizing element / adhesive layer / second support / adhesive layer / third support. That is, the optical laminate 110 includes three supports (first support, second support, and third support) 10, a polarizing element 20, and three adhesive layers 30, with the polarizing element 20 being arranged so as to be interposed between the two supports (first support and second support) 10 via the respective adhesive layers 30. A further support (third support) 10 is provided on the opposite side from the external light incident side (the viewing side) via the adhesive layer 30. In either embodiment, the first support is arranged on the external light incident side when the eyewear is worn, and the second support is arranged on the side that will be integrally molded with the resin material (lens substrate 40) during the processing of the polarized lens, which will be described later.

[0030] (Polarizing Element) The polarizing element used in the present invention is an absorptive polarizing element containing at least one dye-based dichroic dye. Representative polarizing elements include polyvinyl alcohol (PVA) polarizing films and coated polarizing elements (also called "coated" polarizing elements), with PVA polarizing films being preferred. Polarizing elements made of PVA polarizing films are generally referred to as bare polarizing films. PVA polarizing films can be manufactured using known stretching methods. A dye-based dichroic dye is adsorbed onto a resin film containing PVA or its derivatives (hereinafter referred to as a PVA resin film), and the film is uniaxially stretched and oriented by approximately 2 to 6 times its original length. The film thickness of the polarizing element is generally 5 μm or more and 30 μm or less. Commercially available PVA resin films include, for example, "VF-PS#7500" (75 μm thick) manufactured by Kuraray Co., Ltd.

[0031] In polarizing elements, it is preferable to use an azo compound or a salt thereof as a dichroic dye, particularly from the viewpoint of hue design, and it is further preferable to use a direct dye having a sulfonic acid group from the viewpoint of heat resistance. A PVA-based polarizing film containing such a dye-based dichroic dye is called a dye-based polarizing element.

[0032] Dye-based polarizing elements contain at least one dye and can form "colored" polarizing elements with hues known as reds, blues, yellows, oranges, and greens. Furthermore, multiple combinations of these dyes can be used to form grays or other hues. In particular, when combining multiple dyes, a suitable gray hue can be designed by using at least three dyes with λmaxs in the wavelength ranges of approximately 380 to 430 nm, approximately 430 to 580 nm, and approximately 580 to 680 nm, based on the principle of the three primary colors. The term "approximately" refers to a tolerance of 1 to 10 nm between each of the wavelength ranges.

[0033] The hue of the polarizing element can be designed arbitrarily according to the design of the eyewear, but typically a grayish color is used. The term "grayish color" generally refers to a color between white and black, or gray, as well as the L obtained from the transmittance of the polarizing element alone. ＊ a ＊ b ＊ Hue value a in color space (JIS Z 8781-4:2013 CIE 1976) ＊ s and b ＊ Each of the s's refers to a hue in the range of -5 to 5, more preferably -3 to 3.

[0034] When a PVA-based polarizing film is produced as a dye-based polarizing element, in the above-mentioned stretching method, a dyeing solution is prepared by dissolving at least one dye in water or the like, and the PVA-based resin film is immersed in the dyeing solution in the dyeing step to adsorb the dye into the film. In this case, the concentration of each dye in the dyeing solution is preferably in the range of 0.1 to 2.0 parts by mass per 100 parts by mass of the dyeing solution. The dye-based dichroic dye may be used alone or in combination of two or more types depending on the hue design of the polarizing element.

[0035] Examples of dye-based dichroic pigments include C.I. Direct Yellow 12, C.I. Direct Yellow 28, C.I. Direct Yellow 44, C.I. Direct Yellow 50, C.I. Direct Yellow 86, C.I. Direct Yellow 87, C.I. Direct Yellow 130, C.I. Direct Yellow 142, C.I. Direct Yellow 164, C.I. Direct Orange 26, C.I. Direct Orange 71, C. I. Direct Orange 107, C. I. Direct Red 2, C. I. Direct Red 4, C. I. Direct Red 23, C. I. Direct Red 31, C. I. Direct Red 79, C. I. Direct Red 83, C. I. Direct Red 117, C. I. Direct Red 224, C. I. Direct Red 243, C. I. Direct Red 247, C. I. Direct Green 59, C. I. Direct Green 80, C. I. Direct Blue 71, C. I. Direct Blue 78, C. I. Direct Blue 168, C. I. Direct Blue 200, C. I. Direct Blue 202, C. I. Direct Blue 237, C. I. Direct Blue 274, C. I. Direct Blue 291, C. I. Direct Violet 9, C. I. Examples of the suitable colorants include C.I. Direct Violet 48, C.I. Direct Violet 51, C.I. Direct Brown 106, C.I. Direct Brown 223, and the like.

[0036] Many of the above dye-based dichroic pigments have a dichroic ratio of 2 to 34. From the viewpoint of optical properties, such dichroic pigments are typically used in dye-based polarizing elements for general polarized sunglasses.

[0037] The dye-based polarizing element used in the present invention contains one or more dye-based dichroic dyes having a dichroic ratio at the maximum absorption wavelength (λmax) of preferably 38 or more, more preferably 42 or more, and even more preferably 46 or more. Representative examples of such dichroic dyes include azo compounds represented by the following chemical formulas (1) to (5) or salts thereof. The dye-based polarizing element used in the present invention may also be combined with any of the above-mentioned dichroic dyes, as long as the effects of the present invention are achieved. The maximum achievable dichroic ratio for a polarizing element made of such a PVA-based polarizing film is generally 50 to 70.

[0038] Chemical formula (1) is, for example, an azo compound or a salt thereof disclosed in WO 2016 / 186183. A polarizing element using this dye has an Rd of 43 to 46 at the maximum absorption wavelength (λmax).

[0039] (In chemical formula (1), Ar １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rr ４ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group.

[0040] The dyes represented by chemical formulas (2) and (3) are, for example, azo compounds or salts thereof disclosed in WO 2016 / 186183. A polarizing element using the dye has an Rd of 41 to 45 at the maximum absorption wavelength (λmax).

[0041] (wherein Ab １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rb ５ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group; １represents an amino group, phenylamino group, phenylazo group, naphthotriazole group or benzoylamino group, which may have at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group, a lower alkylamino group, a hydroxy group, a carboxy group and a carboxyethylamino group.

[0042] The dye represented by chemical formula (4) is, for example, an azo compound or a salt thereof disclosed in WO 2007 / 138980. A polarizing element using the dye has an Rd of 39 to 42 at the maximum absorption wavelength (λmax).

[0043] (In chemical formula (4), Ay １ and Ay ２ each independently represents a sulfo group, a carboxy group, a hydroxy group, a lower alkyl group, or a lower alkoxy group; １ ~Ry ８ each independently represents a hydrogen atom, a sulfo group, a lower alkyl group, or a lower alkoxy group, and p is an integer of 1 to 3.

[0044] Chemical formula (5) is an azo compound or a salt thereof disclosed in, for example, JP-A-11-218611. A polarizing element using this dye has an Rd of 38 to 40 at the maximum absorption wavelength (λmax).

[0045] (In chemical formula (5), A represents a benzene ring which may have a methyl group, and R represents an amino group, a methylamino group, an ethylamino group, or a phenylamino group.)

[0046] (Support) The support is an optically transparent resin material used to protect the polarizing element and to impart rigidity and integral molding to the polarized lens. As shown in Figures 1 and 2, the support may include, in order from the external light incident side, a first support, a second support, and a third support depending on the design of the optical laminate. The first support, second support, and third support may be made of the same material, or may be made of different materials depending on the design of the optical laminate. Furthermore, each member of the optical laminate can be laminated via an adhesive layer. The film thickness of each support is usually 10 μm or more and 200 μm or less, preferably 40 μm or more and 100 μm or less, and a film or sheet-like material can be used.

[0047] Examples of the material of the support include polycarbonate (PC) resin, triacetyl cellulose (TAC) resin, polyamide (PA) resin, etc., and the shape of the support is preferably a sheet or film. These materials and shapes can be appropriately changed according to the type of injection-molded resin. In this case, in order to ensure adhesion, it is preferable that the injection-molded resin of the lens substrate and the support bonded to the lens substrate of the optical laminate are made of the same material, but this is not limited to this. In addition, the first support, the second support, and even the third support may be the same support, or may be different types of support.

[0048] The adhesive layer is used to bond the support and the polarizing element. The adhesive composition forming the adhesive layer can be a resin material containing at least a base polymer (hereinafter also referred to as the main agent) and a curing aid such as a crosslinking agent, and may be any of a water-based, solvent-based, and solventless type depending on the diluting component of the adhesive composition, and the type is appropriately selected depending on the surface properties of the adherend and the curing method.

[0049] The adhesive layer is provided to bring the support and the polarizing element or the support and another support into close contact, and at least one layer is sufficient in the optical laminate, and multiple layers may be provided depending on the design of the optical laminate. Furthermore, when a TAC-based resin film is used as the support of the optical laminate, a water-based adhesive layer may be used to laminate the polarizing element or the TAC-based resin films together, and the optical laminate may be formed by using the water-based adhesive layer in combination with a solvent-based or solventless adhesive layer.

[0050] As the adhesive composition for forming a solvent-based or solventless adhesive layer, a transparent photocurable resin or thermosetting resin can preferably be used as the main component, such as an acrylic resin, a urethane resin, an epoxy resin, a silicone resin, a rubber resin, a polyvinyl ether resin, and a polyester resin. In particular, processing a polarized lens using the optical laminate of the present invention and a lens substrate requires, as described below, a shaping process involving heat and a step of integral molding with a resin. From the viewpoint of these moldability, the adhesive layer preferably contains a thermosetting resin, and among these, it is particularly preferable to contain an amorphous polyester resin.

[0051] The amorphous polyester resin is preferably soluble in organic solvents, has a mass average molecular weight of 15,000 or more and 30,000 or less, and a glass transition temperature of -20°C or more and 20°C or less. Under these conditions, an adhesive layer that is excellent in lens processability and interlayer adhesion can be formed. Examples of amorphous polyester resins include the commercially available "Vylon" series manufactured by Toyobo MC Co., Ltd.

[0052] The solvent-based adhesive layer is formed by applying an adhesive composition to a base substrate so that the film thickness after solvent removal is 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less. The base substrate refers to a substrate onto which the adhesive composition is directly applied to form an adhesive layer. In the present invention, the adhesive composition may be applied directly to a support, or may be applied to a polyethylene terephthalate (PET) resin film (also called a release film) coated with a release agent to form a film, and then the adhesive layer may be transferred to the polarizing element surface or the support surface by transfer.

[0053] The adhesive composition applied to the base substrate can be dried for 1 to 3 minutes at a temperature of 40 to 140°C, preferably 80 to 130°C, to remove the solvent, thereby obtaining an adhesive layer. In addition, in order to form an adhesive layer with a good surface appearance, it is preferable to use multiple drying ovens and gradually increase the temperature from low to high. Furthermore, the adhesive layer is laminated with the air side facing the surface of the support or polarizing element that will be the adherend surface of the optical laminate described below. In this case, one or both surfaces of the support or polarizing element that will be the adherend surface may be subjected to a surface modification treatment such as corona treatment or plasma treatment to improve adhesion.

[0054] After the above-described lamination, an aging treatment may be carried out to promote the crosslinking reaction of the curing agent in the adhesive layer. The conditions for the aging treatment vary depending on the type of resin and crosslinking agent used, but the adhesive layer used in the present invention is preferably kept in a thermostatic chamber at 25 to 50°C, preferably 35 to 40°C, for about one day to one week. From the viewpoint of improving the adhesion between the layers, the aging treatment is preferably carried out after laminating one surface of the support, which will be the adherend surface, and the surface of the polarizing element via the adhesive layer.

[0055] The adhesive layer can be formed by a known coating method such as flow coating, spraying, bar coating, gravure coating, roll coating, blade coating, air knife coating, lip coating, comma coating, or die coating.

[0056] The adhesive layer may further contain a dye for adjusting the transmittance and hue of the optical laminate in the visible light region. It is preferable that the dye has heat resistance. Such heat resistance is required so that the dye does not decompose or discolor due to heat applied during bending of the optical laminate or lens molding, which will be described later.

[0057] In this case, the hue of the optical laminate may be grayish or may be a colored hue, such as brownish, depending on the design, as long as the effect of the present invention is not impaired. The transmittance of the optical laminate is preferably determined by adjusting the amount of pigment so that τv is 43% or more, based on the international standard for sunglasses. The method of adjusting the hue of such an optical laminate by incorporating a pigment into the adhesive layer is simpler than the method of directly changing the hue of the polarizing element by changing the amount of dichroic pigment contained, and has the advantage of being able to maintain the high optical properties of the polarizing element of the present invention.

[0058] As such a dye, for example, a hue-adjusting dye or a specific wavelength absorbing dye, which will be described later, can be preferably used. The hue-adjusting dye and the specific wavelength absorbing dye may be used in combination depending on the desired hue.

[0059] As the hue-adjusting dye, it is preferable to use a dye referred to as a resin coloring dye. The optical properties of the optical laminate are adjusted using the hue-adjusting dye by incorporating into the adhesive layer, for example, a plurality of dyes corresponding to each wavelength range in the visible light range selected from (A) to (D) below, based on the transmittance waveform exhibited by a gray-based polarizing element. This reduces the transmittance in the wavelength range corresponding to the λmax of each dye, thereby enabling the transmittance waveform to be adjusted across the visible light range and allowing any color tone to be designed. Furthermore, the hue-adjusting dye is not limited to (A) to (D) below, and dyes exhibiting other colors of the same kind or dyes having multiple light absorption wavelength ranges may also be used as long as the objectives of the present invention are met. (A) Red dyes (having λmax in the wavelength range of 400 nm to 500 nm) (B) Green dyes (having λmax in the wavelength range of 500 nm to 600 nm) (C) Blue dyes (having λmax in the wavelength range of 600 nm to 700 nm) (D) Yellow dyes (having λmax in the wavelength range of 380 nm to 500 nm)

[0060] (A) Examples of red (Red) dyes (having λmax in the wavelength range of 400 nm or more and 500 nm or less) include Solvent Red 111, Solvent Red 135, Solvent Red 168, Solvent Red 207, Disperse Red 22, Solvent Red 52, Solvent Red 179, and Disperse Red 60.

[0061] (B) Examples of green dyes (having λmax in the wavelength range of 500 nm or more and 600 nm or less) include Solvent Green 3, Solvent Green 20, and Solvent Green 28.

[0062] (C) Examples of blue dyes (having λmax in the wavelength range of 600 nm or more and 700 nm or less) include Disperse Blue 63, Solvent Blue 104, and Solvent Blue 97.

[0063] (D) Yellow dyes (having λmax in the wavelength range of 380 nm or more and 500 nm or less) include, for example, Solvent Yellow 33, Disperse Yellow 54, Disperse Yellow 160, Disperse Yellow 201, and Disperse Yellow 60.

[0064] The specific wavelength absorbing dye is a dye having optical properties in which λmax is in the wavelength range of 570 nm to 600 nm, and the half-width is 10 nm to 60 nm. Examples of such specific wavelength absorbing dyes include cyanine-based, squarylium-based, xanthene-based, oxonol-based, azo-based, and tetraazaporphyrin-based dyes, with tetraazaporphyrin-based dyes exhibiting a blue to purple color being preferred. One or more types may be blended into the adhesive layer depending on the optical design.

[0065] (Evaluation of Optical Laminate) The optical properties of the optical laminate can be evaluated by measuring the luminosity-corrected transmittance (Ys, unit: %), luminosity-corrected polarization degree (Py, unit: %), hue value, and crossed transmittance (Ykz, unit: %). For example, these optical properties can be measured using a spectrophotometer. The evaluation of the optical properties may be performed in the form of a polarizing element or polarizing lens, as long as it does not affect the obtained measured values.

[0066] (Natural Light Incidence Measurement) Ys is measured using natural light (not polarized light) as a light source (hereinafter referred to as natural light incidence measurement). Ys indicates scenery visibility when eyewear including the optical laminate is worn, and corresponds to the brightness of the eyewear and the visibility of scenery visible through the eyewear.

[0067] Specifically, the measurement of incident natural light is carried out in the wavelength range of the visible light region (wavelength 380 to 780 nm) under detection conditions usually with a pitch of 10 nm or less, preferably a pitch of 5 nm or less. Here, the transmittance measurement is carried out using one test piece, placed at 0 degrees and 90 degrees with respect to the transmission axis or absorption axis, and the average value of the transmittance for each wavelength is taken as the transmittance of the optical laminate. From the obtained transmittance, Ys is calculated based on JIS Z8781-2. In this case, the light source correction value can preferably be C light source or D65 light source. Furthermore, from this transmittance waveform, L ＊ a ＊ b ＊ Based on the color space (JIS Z 8781-4:2013 CIE 1976), the transmitted hue value (a ＊ s and b ＊ s) is calculated.

[0068] Similarly, the luminosity-corrected parallel transmittance (Yp, unit: %) can be calculated from the transmittance obtained by overlapping two of the test pieces with their transmission axes or absorption axes parallel to each other, and the luminosity-corrected orthogonal transmittance (Yc, unit: %) can be calculated from the transmittance obtained by overlapping two of the test pieces with their transmission axes or absorption axes perpendicular to each other. Furthermore, Py can be calculated by substituting these transmittances into the following mathematical formula (II). Py corresponds to the antiglare properties when eyewear containing the optical laminate is worn, and the higher the value, the more efficiently only reflected light can be blocked.

[0069] Py={(Yp-Yc) / (Yp+Yc)} １／２ × 100 (II)

[0070] (Polarized Incident Measurement) Another optical property of the optical laminate, Ykz, can be determined by measurement using polarized light as a light source (hereinafter referred to as polarized incident measurement). Ykz can generally be determined by a measurement method called the absolute polarization method (Ky-Kz method), and is measured using, for example, the above-mentioned spectrophotometer, using polarized light emitted through a polarizing element having a luminosity-corrected polarization degree of 99.99% or more obtained based on ISO Z8781-2 as a light source.

[0071] Specifically, polarized light incidence measurement is performed in the visible light range (wavelengths of 380 to 780 nm) under detection conditions of usually 10 nm pitch or less, preferably 5 nm pitch or less. Here, transmittance measurement is performed using a single test piece, and Ykz is calculated based on the transmittance waveform for each wavelength obtained by incident polarized light perpendicular to the absorption axis, based on JIS Z8781-2. In this case, the light source correction value can preferably be C light source or D65 light source.

[0072] Ykz is used to quantify the display visibility of a HUD device when wearing eyewear including an optical laminate. A Ykz value lower than 8% indicates that "blackout" occurs, that is, the display image of the HUD device is blocked by the optical laminate and cannot be fully seen. On the other hand, a Ykz value of 8% or more suppresses "blackout" and ensures sufficient display visibility.

[0073] Therefore, in the optical laminate, considering its application as eyewear, Ys is preferably 43% to 55% and more preferably 48% to 51% so that more natural scenery can be viewed. Furthermore, Py is preferably 78% to 85% and more preferably 80% to 83% so that reflected light can be more efficiently blocked. Furthermore, Ykz is preferably 8% to 12% and more preferably 9% to 11% to ensure better display visibility of the HUD device. If Ykz exceeds 12%, the display visibility of the HUD device can be improved, but conversely, there is a high possibility that the anti-glare properties of the polarized eyewear will be impaired.

[0074] In order to design such a highly transmittant polarizing element, the use of the dye-based polarizing element used in the present invention described above is preferable in consideration of ease of hue adjustment. Also, in consideration of heat resistance during lens processing, the use of the dye-based polarizing element used in the present invention described above is preferable because iodine-based polarizing elements are deteriorated by the heat during processing.

[0075] <Polarized Lens> The polarized lens of the present invention comprises a lens substrate and the above-described optical laminate, and is suitable for use in eyewear. The polarized lens of the present invention can be obtained by molding the optical laminate into a desired shape so that the first support is on the outside (the side opposite the lens substrate). Furthermore, eyewear such as sunglasses or goggles can be obtained by fixing the polarized lens of the present invention to a frame. An example of the process for forming a polarized lens is shown below, but the process is not limited to this.

[0076] Polarized lenses can typically be obtained by sequentially carrying out the steps of forming a sheet- (or film-) shaped optical laminate containing polarizing elements, shaping (bending) the optical laminate, insert-molding the shaped optical laminate and a resin, and applying a hard coat to the resulting insert-molded product.

[0077] The shaping (bending) of the optical laminate is performed using a heat press or the like to facilitate processing into a lens shape in combination with a lens substrate, which will be described later. A mold designed to a predetermined size is used for the shaping, and the shape of the mold is appropriately designed according to the design of the eyewear product, etc. FIG. 3 shows an outline of the shaping (bending) of the optical laminate according to the present invention. As shown in FIG. 3 , the optical laminate 100 is placed in a bending mold 50 (concave mold), and the optical laminate 100 is pressed with a hemispherical mold 51 (convex mold, also called a hot iron ball) heated to a predetermined temperature, thereby obtaining a curved optical laminate 101. That is, the second support 12, which is the support on the viewing side of the optical laminate 100, is injection molded using the spherical mold 51, and the optical laminate 101 is bent up to the first support 11.

[0078] The bending conditions are determined in consideration of the bendability and heat resistance (discoloration of the polarizing element, etc.) of the optical laminate, and the temperature is usually 70 to 120°C, preferably 80 to 100°C, and the time is in the range of 1 to 3 minutes. At this time, only a portion of the optical laminate to be used in the subsequent insert molding step may be simultaneously or sequentially trimmed from the sheet-like optical laminate.

[0079] (Lens substrate) The lens substrate is a resin material used for integrating with the optical laminate of the present invention and processing it into a lens shape. In the bending process described above, a resin (also referred to as a lens substrate) may be further injected. In this case, there is an advantage that the thickness unevenness of the optical laminate of the present invention becomes invisible, and even for lenses without focal refractive power, resin injection is performed to produce products that are particularly excellent in impact resistance, appearance, and eye fatigue. In order to prevent deterioration of appearance due to refractive index differences, it is preferable that the injected resin be the same material as the layer with which the injected resin is in contact. For such integration processing, an insert molding method can generally be used.

[0080] The resin used for the lens substrate is not particularly limited, and examples thereof include thermoplastic resins that can be molded by injection molding, and thermosetting resins that can be molded by mold polymerization or the like and are commonly used for eyewear lenses, etc. Examples of such resins include (meth)acrylic resins such as methyl methacrylate homopolymers and copolymers of methyl methacrylate and one or more other monomers, diethylene glycol bisallyl carbonate resins such as diethylene glycol bisallyl carbonate homopolymers and copolymers of diethylene glycol bisallyl carbonate and one or more other monomers, acrylonitrile-styrene copolymers, halogen-containing copolymers, polysulfide resins such as homopolymers of monomers having sulfide bonds and copolymers of monomers having sulfide bonds and one or more other monomers, polyurea resins, PA resins, PC resins, polystyrene resins, polyolefin resins, polyvinyl chloride resins, polyester resins, PET resins, polyurethane resins, and sulfur-containing urethane resins such as polythiourethane resins, and epoxy resins. From the viewpoint of adhesion to the optical laminate, the material of the lens substrate is preferably the same as the material of the layer that comes into contact with the lens substrate. As a specific example, by using a PA-based resin for the support of the optical laminate on the side to be processed integrally, and a PA-based resin for the lens substrate as well, the support and the lens substrate can be fused together.

[0081] <Eyewear> The eyewear of the present invention comprises the above-described polarized lens. The polarized lens may have a hard coating, an anti-reflection film, or the like formed on its surface as appropriate, and the eyewear of the present invention can be produced by fixing the polarized lens to a frame by edging, drilling, screwing, or the like.

[0082] Furthermore, in the eyewear of the present invention, depending on the design, an ultraviolet absorber may be contained in any layer of the optical laminate or lens substrate to provide ultraviolet absorption ability, or a dye, metal oxide, or the like to provide infrared absorption function.

[0083] Based on the above embodiments, the present invention relates to the following [1] to [5]. [1] An optical laminate comprising a first support, a second support, and a polarizing element disposed between the first support and the second support, wherein the polarizing element contains one or more dye-based dichroic dyes having a dichroic ratio (Rd) of 38 or greater at the maximum absorption wavelength (λmax), and wherein the optical laminate has a luminosity-corrected transmittance (Ys) of 43% to 55% and a luminosity-corrected polarization degree (Py) of 78% to 85%. [2] The optical laminate according to [1] above, wherein the optical laminate has a crossed transmittance (Ykz) of 8% to 12%. [3] The optical laminate according to [1] or [2] above, wherein the dichroic dye contains at least one azo compound represented by any of the following chemical formulas (1) to (5) or a salt thereof. (In formula (1), Ar １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rr ４ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group. (In the chemical formula (2) or chemical formula (3), Ab １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rb ５ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group; １ represents an amino group, phenylamino group, phenylazo group, naphthotriazole group or benzoylamino group, which may have a substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group, a lower alkylamino group, a hydroxy group, a carboxy group and a carboxyethylamino group) (In chemical formula (4), Ay １ and Ay ２ each independently represents a sulfo group, a carboxy group, a hydroxy group, a lower alkyl group, or a lower alkoxy group;１ ~Ry ８ each independently represents a hydrogen atom, a sulfo group, a lower alkyl group, or a lower alkoxy group, and P is an integer of 1 to 3. (In chemical formula (5), A represents a benzene ring optionally having a methyl group, and R represents an amino group, a methylamino group, an ethylamino group, or a phenylamino group.) [4] A polarized lens comprising a lens substrate and the optical laminate described in any one of [1] to [3] above. [5] Eyewear comprising the polarized lens described in [4] above.

[0084] The present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples.

[0085] (1) Preparation of Dyes As dyes to be used in the production of the polarizing elements of Examples 1 to 3 and Comparative Examples 1 to 3, the following dyes 1 to 8 were prepared.

[0086] Dye 1: As the dye of the above chemical formula (1), a dye of the following chemical formula (1-1) described in the examples of WO 2016 / 186183 was synthesized in accordance with that publication. In a polarizing element, this dye had a λmax at a wavelength of 520 mm and an Rd at that wavelength of 46.

[0087] Dye 2: As the dye of the above chemical formula (2), a dye of the following chemical formula (2-1) described in the examples of WO 2016 / 186183 was synthesized in accordance with that publication. In a polarizing element, this dye had a λmax at a wavelength of 630 mm and an Rd at that wavelength of 44.

[0088] Dye 3: As the dye of the above chemical formula (4), a dye of the following chemical formula (4-1) described in the examples of WO 2007 / 138980 was synthesized according to that publication. In a polarizing element, this dye had a λmax at a wavelength of 470 mm and an Rd at that wavelength of 39. (wherein n is an integer of 1 or 3)

[0089] Dye 4: As the dye of the above chemical formula (5), a dye of the following chemical formula (5-1) described in the examples of JP-A No. 11-218611 was synthesized in accordance with said publication. In a polarizing element, this dye had a λmax at a wavelength of 620 mm and an Rd at said wavelength of 38.

[0090] Dye 5: A dye represented by the following chemical formula (6) was synthesized according to the example of JP-A-60-156759. In a polarizing element, this dye had a λmax at a wavelength of 670 mm and an Rd at that wavelength of 29.

[0091] Dye 6: C.I. Direct Orange 39 (Kayafect Orange G, manufactured by Nippon Kayaku Co., Ltd.) was used. This dye had a λmax at a wavelength of 450 mm in a polarizing element, and an Rd at that wavelength of 34.

[0092] Dye 7: C.I. Direct Red 81 (manufactured by Nippon Chemical Industry Co., Ltd., Red 4BH) was used. This dye had a λmax at a wavelength of 545 mm in a polarizing element, and an Rd at that wavelength of 34.

[0093] Dye 8: C.I. Direct Blue 273 (manufactured by Nippon Kayaku Co., Ltd., Kayafect Blue F Liquid 400) was used. This dye had a λmax at a wavelength of 620 mm in a polarizing element, and Rd at that wavelength was 18.

[0094] [Example 1] (2) Preparation of Polarizing Plate A dyeing solution was prepared by dissolving each of Dyes 1, 2, 3, and 5 in water to a concentration of 1.0 part by mass. Next, a PVA-based resin film (VF-PS#7500, manufactured by Kuraray Co., Ltd.) was immersed in water while uniaxially stretching to swell, and then immersed in the dyeing solution. The film was then stretched 4 to 6 times using an aqueous boric acid solution, thereby orienting the dyes in the resin film. After stretching, the film was dried in a dryer at 70°C for 3 minutes while maintaining tension, thereby preparing a grayish polarizing element. Next, a TAC resin film (Island Polymer Industries GmbH, 13SG80S-LH, film thickness 80 μm) that had been saponified (immersed in a 2N sodium hydroxide aqueous solution and held at 40°C for 10 minutes) was bonded to the polarizing element as a first support using a water-based adhesive containing a PVA resin (solid content of the PVA resin was 2.0 wt%). This was then dried at 80°C for 3 minutes to remove moisture, and the polarizing element and the TAC resin film were bonded together to produce a polarizing plate having a first support on one side of the polarizing element.

[0095] (3) Preparation of adhesive composition An adhesive composition was prepared by blending 2 parts by mass of an isocyanate curing agent (590E manufactured by Soken Chemical & Engineering Co., Ltd.), 0.01 part by mass of dibutyltin dilaurate (DBSn), and 0.21 parts by mass of cyclohexanone as a dilution solvent with respect to the resin solids of an organic solvent-soluble polyester resin (Vylon 500 manufactured by Toyobo Co., Ltd., resin solids concentration 44.9%) as a main component of the adhesive composition.

[0096] (4) Preparation of Optical Laminate The prepared adhesive composition was applied by a die coater method to one side of a PA resin film (manufactured by EMS, TRF-800, film thickness 80 μm) as a second support, and the coated film was dried at 100 ° C. for 3 minutes to remove the solvent, thereby obtaining an adhesive layer (film thickness 24 μm). The polarizing element surface of the polarizing plate prepared in (2) above was then bonded to the air side of the adhesive layer to produce an optical laminate of the present invention. The optical properties of the obtained optical laminate were measured using a spectrophotometer (manufactured by Hitachi High-Tech Science Corporation, UH4150), and the results were Ys = 50.4%, Py = 82.1%, and Ykz = 9.1%. The results are shown in Table 1.

[0097] [Example 2] An optical laminate was produced in the same manner as in Example 1, except that in (2) of Example 1, a dyeing solution prepared by dissolving 1.0 part by mass of each of Dyes 1, 4, 5, and 6 in water was used to produce a grayish polarizing element. The optical properties of the optical laminate were Ys = 49.9%, Py = 82.0%, and Ykz = 9.0%.

[0098] [Example 3] An optical laminate was produced in the same manner as in Example 1, except that in (2) of Example 1, a dyeing solution prepared by dissolving 1.0 part by mass of each of dyes 4, 5, 6, and 7 in water was used to produce a grayish polarizing element. The optical properties of the optical laminate were Ys = 47.6%, Py = 82.2%, and Ykz = 8.5%.

[0099] [Comparative Example 1] An optical laminate was obtained in the same manner as in Example 1, except that in (2) of Example 1, a dyeing solution prepared by dissolving 1.0 part by mass of each of Dyes 6, 7, and 8 in water was used to prepare a grayish polarizing element. The optical properties of the optical laminate were Ys = 47.0%, Py = 68.6%, and Ykz = 14.7%.

[0100] [Comparative Example 2] An optical laminate was produced according to the method described in Example 3 of WO 2014 / 115705. The optical properties of the optical laminate were Ys = 24.0%, Py = 80.3%, and Ykz = 2.6%.

[0101] [Comparative Example 3] Based on the description of Chinese Utility Model No. 202122746446, a quarter-wave plate (Teijin Limited, Pure Ace RM-147, film thickness 53 μm) and the first support surface of the optical laminate obtained in Example 2 were laminated via an adhesive layer to produce an optical laminate equipped with a retardation plate. At this time, the slow axis of the retardation plate was arranged so as to be 45 ° with respect to the absorption axis of the polarizing element. The optical properties of the obtained optical laminate were measured with the retardation plate placed on the incident side of the measuring instrument light source, and were Ys = 46.6%, Py = 5.6%, Ykz = 44.2%.

[0102]

[0103] As shown in Table 1, in Examples 1 to 3, optical laminates were produced in which Py was in the range of 78% or more and 85% or less, Ys was in the range of 43% or more and 55% or less, and Ykz was in the range of 8% or more and 12% or less. Thus, in Examples 1 to 3, Py, Ys, and Ykz were all within the desired ranges. Therefore, even when such optical laminates are used in polarized sunglasses, they are expected to be able to maintain the anti-glare properties and scenery visibility of polarized sunglasses while ensuring the display visibility of HUD devices.

[0104] On the other hand, in Comparative Example 1, Ys was equivalent to that of Example 3, but Py was lower than 78% and Ykz was higher than 12%. In this case, Ykz was secured to be 8% or more, and blackout of the HUD display was prevented, but the low Py raised concerns about anti-glare properties.

[0105] In Comparative Example 2, Py was 78% or more, but Ys was less than 43%, and Ykz was also less than 8%. In this case, Py was high and antiglare properties were expected, but Ys was low, raising concerns about reduced landscape visibility. Furthermore, because Ykz was low, blackouts occurred in the display of the HUD device, potentially deteriorating display visibility.

[0106] In Comparative Example 3, an optical laminate was produced in which Ys was in the range of 43% or more and 55%, but Py was significantly below 78%, and YKz was greater than 12%. In this case, the desired Ys was ensured, YKz was high, and there was little possibility of blackout occurring in the display of the HUD device, but Py was low, so the desired antiglare properties could not be maintained.

[0107] The sensory evaluation of visibility using the optical laminates produced in Examples 1 to 3 and Comparative Examples 1 to 3 will be described below.

[0108] (Test A: Evaluation of Visibility of HUD Display Image) In Test A, as shown in FIG. 4, the optical laminate 100 prepared above was positioned so that its absorption axis was horizontal. Next, assuming an automobile HUD device, a commercially available color IPS liquid crystal display (Hermans, SZ-LCDMN-7) was used as the display 60, and blue plate glass (thickness 1.5 mm) was used as the projection unit 61 instead of the windshield. The display image from the display 60 was projected onto the projection unit 61, and the observer (optical laminate) 100 was positioned so that the display image could be observed as a virtual image. At this time, the display 60 was installed so that the polarization direction of the emitted display light was horizontal. The evaluation was performed by having 10 panelists confirm the visibility of the virtual image of the projection unit 61 viewed through the optical laminate 100 according to the following criteria. The results are shown in Table 2.

[0109] Judgment criteria for test A: (1) The virtual image is clearly visible. (2) The virtual image is visible but not clearly visible. (3) The virtual image is barely visible.

[0110] (Test B: Evaluation of Anti-Glare Properties of External Light) In Test B, similar to Test A, each optical laminate 100 was placed as eyewear, covering both eyes of the observer. At this time, the optical laminate 100 was placed so that the absorption axis thereof was horizontal. The test was conducted by having the observer observe a landscape including reflected light from the sunlight generated from the windshield of an automobile, the window glass of a building, etc., outdoors on a sunny day. The evaluation was conducted by having 10 panelists confirm the effect of reducing glare caused by the reflected light through the optical laminate 100 according to the following evaluation criteria. The results are shown in Table 2.

[0111] Evaluation criteria for test B (4) The glare of external light is reduced. (5) The glare of external light is hardly reduced.

[0112]

[0113] In Examples 1 to 3, 8 to 9 out of 10 people answered criterion (1). From these results, it was confirmed that when Ykz is 8.5% or more and 9.1% or less, the displayed image can be clearly seen. Furthermore, in Test B, 10 out of 10 people answered criterion (4). From these results, it was confirmed that when Py is 82.0% or more and 82.2% or less, there is an effect of reducing the glare of external light.

[0114] On the other hand, in Comparative Examples 1 and 3, in Test A, 7 to 10 out of 10 people answered criterion (1). This is because Ykz was 14.7% or more and 44.2% or less, which was higher than in Examples 1 to 3. Furthermore, in Test B, 7 to 10 out of 10 people answered criterion (5). It was confirmed that when Py was 5.6% or more and 68.6% or less, there was no or insufficient effect in reducing the glare of external light. In particular, in Comparative Example 3, even if the visibility of the displayed image was ensured, Py was significantly low, which resulted in the loss of the sunglasses' inherent polarization function.

[0115] In addition, in Comparative Example 2, 10 out of 10 people answered criterion (3) in Test A. This was due to the Ykz being 2.6%, which resulted in the display image of the HUD device being blacked out and completely invisible. In Test B, 10 out of 10 people answered criterion (4). From these results, it was confirmed that Comparative Example 2 has the effect of reducing the glare of external light because Py is 80.3%, which is at the same level as Examples 1 to 3.

[0116] From the above results, it was confirmed that the polarized lenses using the optical laminates produced in Examples 1 to 3 achieved both the visibility of the display of the HUD device and anti-glare properties against external light.

[0117] The optical laminate of the present invention, and polarized lenses and eyewear using the same, provide anti-glare properties that block external light through their polarization function when driving a vehicle equipped with a HUD device, while allowing the image displayed on the HUD device to be viewed without being obstructed. The optical laminate of the present invention, which has such performance, is an optical laminate with new properties that are not classified under existing international standards for sunglasses, and can contribute to improving comfort and safety in the driving environment of a vehicle.

[0118] REFERENCE SIGNS LIST 10 Support (first support, second support, third support) 11 First support 12 Second support 20 Polarizing element 30 Adhesive layer 40 Lens substrate 50 Bending mold (concave) 51 Hemispherical mold (convex) 60 Display 61 Projection unit 62 Light direction of displayed image 100, 110 Optical laminate 101 Bent optical laminate

Claims

1. An optical laminate comprising a first support, a second support, and a polarizing element disposed between the first support and the second support, wherein the polarizing element contains one or more dye-based dichroic pigments having a dichroic ratio (Rd) of 38 or greater at the maximum absorption wavelength (λmax), and wherein the optical laminate has a luminosity-corrected transmittance (Ys) of 43% to 55% and a luminosity-corrected polarization degree (Py) of 78% to 85%.

2. The optical laminate according to claim 1, wherein the optical laminate has a cross transmittance (Ykz) of 8% or more and 12% or less.

3. The optical laminate according to claim 1, wherein the dichroic dye comprises at least one azo compound represented by any one of the following chemical formulas (1) to (5) or a salt thereof: (In formula (1), Ar １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rr ４ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group. (In the chemical formula (2) or chemical formula (3), Ab １ represents a phenyl group or a naphthyl group having at least one sulfo or carboxy group substituent; １ ~Rb ５ each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, or a lower alkoxy group having a sulfo group; １ represents an amino group, phenylamino group, phenylazo group, naphthotriazole group or benzoylamino group, which may have a substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group, a lower alkylamino group, a hydroxy group, a carboxy group and a carboxyethylamino group) (In chemical formula (4), Ay １ and Ay ２ each independently represents a sulfo group, a carboxy group, a hydroxy group, a lower alkyl group, or a lower alkoxy group; １ ~Ry ８ each independently represents a hydrogen atom, a sulfo group, a lower alkyl group, or a lower alkoxy group, and P is an integer of 1 to 3. (In chemical formula (5), A represents a benzene ring which may have a methyl group, and R represents an amino group, a methylamino group, an ethylamino group, or a phenylamino group.) 4. A polarized lens comprising a lens substrate and the optical laminate according to any one of claims 1 to 3.

5. Eyewear comprising the polarized lens according to claim 4.

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