Optical laminates, lenses and eyewear using the same

Abstract

This reduces the color change in the front and oblique directions of a laminate that has a light-reflecting layer that serves as a cholesteric liquid crystal layer. [Solution] The optical laminate comprises, in order from the external light incident side, a first support, a light-reflecting layer including a cholesteric liquid crystal layer (L-body), and a second support, having a reflection band with a full width at half maximum of 40 to 70 nm with respect to the maximum reflection wavelength in the visible light range, having an adhesive layer between the first support and the light-reflecting layer, the adhesive layer containing at least one dye that reduces hue change, the reflection hue adjusting dye having a maximum absorption wavelength located 30 to 140 nm shorter wavelength away from the maximum reflection wavelength of the light-reflecting layer, and at least one adhesive layer between the light-reflecting layer and the second support containing at least one dye that corrects the transmitted hue, and the transmitted hue of the optical laminate is L * a * b * Hue values ​​(a) in the color space (CIE1976) * s and b * In s), a * s = -5.0 to 5.0, b * An optical laminate where s = -5.0 to 5.0.

Description

[Technical Field]

[0001] The present invention relates to an optical laminate having a light-reflecting layer, a lens for eyewear using the same, and eyewear (sunglasses, goggles, helmet visors, etc.). [Background technology]

[0002] To reduce glare from reflected light from surfaces such as water, roads, and snow, polarized eyewear (sunglasses, goggles, visors, etc.) is used. Because this reflected light has the property of becoming polarized, polarized sunglasses, for example, are equipped with polarized lenses and are designed to effectively absorb such reflected light. As a result, they can reduce glare and improve visibility without significantly reducing the amount of light entering the wearer's eyes.

[0003] The optical films used in polarized lenses typically have a structure in which a polarizing film is sandwiched between support materials such as polycarbonate, forming an optical laminate. Polarized sunglasses are manufactured by combining such an optical laminate with a lens substrate (lens resin) to form a polarized lens of the desired shape, and then fitting it into an eyeglass frame.

[0004] Incidentally, polarized sunglasses sometimes have a light-reflecting layer on the surface of the polarized lens to further improve functionality and add decorative appeal (Patent Document 1). Wearers of such polarized sunglasses gain glare reduction and improved visibility of scenery by reflecting specific light. Meanwhile, those around them perceive the surface of the polarized sunglasses as metallic reflective colors such as blue, green, and red, which creates an aesthetic appeal.

[0005] One method for creating such a light-reflecting layer involves using a cholesteric liquid crystal layer (Patent Document 2). A cholesteric liquid crystal layer is a state in which liquid crystal molecules are helically oriented, and depending on the length of the helical pitch, it has the function of selectively reflecting circularly polarized light components in the same direction as the helical orientation of the liquid crystal molecules in a specific wavelength range. An optical laminate using a cholesteric liquid crystal layer with fixed helical orientation so that light is reflected in a desired wavelength range exhibits brighter colored reflected light than a light-reflecting layer using a multilayer film made by metal deposition, thus providing excellent decorative properties. Furthermore, the design of the reflected hue of such a light-reflecting layer using a cholesteric liquid crystal layer is generally carried out by creating light-reflecting layers having representative reflected hues such as blue, green, and red, and laminating them individually or in combination. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2000-066149 [Patent Document 2] Japanese Patent Publication No. 2001-180200 [Patent Document 3] International Publication No. WO2013 / 051489

[0007] [Non-Patent Document 1] Journal of the Liquid Crystal Society of Japan, Vol. 2, No. 2, published April 25, 1998. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] The reflective properties of cholesteric liquid crystal layers are angle-dependent, meaning that when viewed from an oblique angle, the reflected wavelength range shifts to shorter wavelengths, causing the hue to appear different. In particular, optical laminates used in eyewear are generally shaped into a curved form, then integrally molded with resin to form lenses (polarizing lenses), resulting in a curved surface. Therefore, eyewear equipped with such lenses will appear to have different reflected hues depending on whether they are viewed from the front of the lens (the side where external light enters) or from an oblique angle (the edge of the lens). This phenomenon becomes more pronounced as the degree of lens curvature increases. While this change in reflected hue is one of the characteristics of cholesteric liquid crystal layers, when the decorative aspect of eyewear is important, there is a need to minimize the angle-dependent change in reflected hue and design the eyewear to appear as a uniform reflected hue regardless of the viewing angle.

[0009] Therefore, in view of the above problems, the present invention aims to provide an optical laminate having a cholesteric liquid crystal layer as a light-reflecting layer, in which the change in hue between the reflected hue visible from the front and the reflected hue visible from an oblique direction is reduced and made visible, as well as a lens and eyewear using the same. [Means for solving the problem]

[0010] As a result of diligent research, the inventors of the present invention have found that an optical laminate having the following configuration solves the above problems, and have completed the present invention. The present invention relates to the following [1] to

[15] .

[0011] [1] An optical laminate comprising, in order from the side where ambient light is incident, a first support, a light-reflecting layer including a cholesteric liquid crystal layer (R-body) with a right-handed spiral direction and / or a cholesteric liquid crystal layer (L-body) with a left-handed spiral direction, and a second support, each laminated via an adhesive layer, The aforementioned light-reflecting layer has a reflection band with a full width at half maximum of 40 to 70 nm with respect to the maximum reflection wavelength in the visible light range. There is an adhesive layer between the first support of the optical laminate and the light reflection layer, and the adhesive layer contains at least one kind of dye (reflection hue adjustment dye) that reduces the hue change of the reflection hue of the optical laminate. The optical laminate is characterized in that the reflection hue adjustment dye has a maximum absorption wavelength separated by 30 to 140 nm on the shorter wavelength side from the maximum reflection wavelength of the light reflection layer. [2] When the maximum reflection wavelength of the light reflection layer is 600 to 700 nm, the adhesive layer of the optical laminate according to [1] contains the dye described in the following (A) having an anthraquinone skeleton as the reflection hue adjustment dye, or the dye described in the following (E) having a tetraazaporphyrin skeleton and the dye described in (A). (A) Red dye (having a maximum absorption wavelength in the wavelength range of 500 to 550 nm) (E) Purple dye (having a maximum absorption wavelength in the wavelength range of 570 to 600 nm) [3] When the maximum reflection wavelength of the light reflection layer is 500 to 600 nm, the adhesive layer of the optical laminate according to [1] contains the dye described in the following (D) having a styryl skeleton as the reflection hue adjustment dye. (D) Yellow dye (having a maximum absorption wavelength in the wavelength range of 400 to 450 nm) [4] When the optical laminate is tilted from the vertical direction to the horizontal direction, the reflection hue is represented by the following formula (1), L * a * b * The saturation c calculated from the reflection hue values (a * r and b * r) in the color space (CIE 1976) * r, when the tilt angle is 50 degrees, c * r = 50 or less, and when the tilt angle is 60 degrees, c * r = 20 or less. The optical laminate according to any one of [1] to [3]. (Equation 1) c * r = {(a * r) 2 + (b * r) 2} 1 / 2 ···(1) [5] At least one adhesive layer between the light-reflecting layer and the second support contains at least one dye (transmitting hue-adjusting dye) that corrects the transmitted hue of the optical laminate that has been shifted by the addition of the reflective hue-adjusting dye. The aforementioned transmissive hue-adjusting dye is a dye selected from (F) to (I) below, The transmitted hue of the optical laminate is L * a * b * Hue values ​​(a) in the color space (CIE 1976) * s and b * In s), a * s = -5.0 to 5.0, b * An optical laminate described in any one of [1] to [3], where s = -5.0 to 5.0. (F) Red pigments (with maximum absorption wavelengths in the 400-500 nm wavelength range) (G) Green pigments (with maximum absorption wavelengths in the 500-600 nm range) (H) Blue pigments (with maximum absorption wavelengths in the 600-700 nm wavelength range) (I) Yellow pigments (with maximum absorption wavelengths in the 400-450 nm wavelength range) [6] The optical laminate according to any one of [1] to [3], characterized in that it includes a polarizing layer between the light-reflecting layer and the second support. [7] The optical laminate according to [5], characterized in that it includes a polarizing layer between the light-reflecting layer and the second support. [8] A lens formed by molding a lens substrate with an optical laminate described in any one of items [1] to [3]. [9] A lens formed by molding a lens substrate and the optical laminate described in [5].

[10] A lens formed by molding a lens substrate and the optical laminate described in [6].

[11] A lens formed by molding a lens substrate and the optical laminate described in [7].

[12] Eyewear featuring the lenses described in [8].

[13] Eyewear featuring the lenses described in [9].

[14] Eyewear featuring the lenses described in

[10] .

[15] Eyewear featuring the lenses described in

[11] . [Effects of the Invention]

[0012] According to one aspect of the present invention, an optical laminate comprising a light-reflecting layer which is a cholesteric liquid crystal layer can be made visible by reducing the hue change between the reflected hue that is visible from the front and the reflected hue that is visible from an oblique direction, and a lens and eyewear using the same can be provided.

[0013] Furthermore, according to another aspect of the present invention, it is possible to provide an optical laminate in which the coloration of the transmitted hue of the optical laminate is reduced even when the reflected hue of the optical laminate is adjusted, as well as lenses and eyewear using the same. [Brief explanation of the drawing]

[0014] [Figure 1] This is a conceptual diagram of a first embodiment of the optical laminate of the present invention. [Figure 2] This is a conceptual diagram of another first embodiment of the optical laminate of the present invention. [Figure 3] This is a conceptual diagram of a second embodiment of the optical laminate of the present invention. [Figure 4] This is a conceptual diagram of another second embodiment of the optical laminate of the present invention. [Figure 5] This is a conceptual diagram of a third embodiment of the optical laminate of the present invention. [Figure 6] This is a conceptual diagram of another third embodiment of the optical laminate of the present invention. [Figure 7] This is a conceptual diagram of an apparatus for measuring the angle dependence of the reflected hue of an optical laminate according to the present invention. [Figure 8] These are the transmittance waveform of the first adhesive layer prepared in Example 1, the transmittance waveform of the optical laminate, and the reflectance waveform of the optical laminate. [Figure 9] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Example 2. [Figure 10] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Example 3. [Figure 11] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Example 4. [Figure 12] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Comparative Example 1. [Figure 13] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Comparative Example 2. [Figure 14] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Comparative Example 3. [Figure 15] These are the transmittance waveform of the first adhesive layer, the transmittance waveform of the optical laminate, and the reflectance waveform of the first adhesive layer prepared in Comparative Example 4. [Modes for carrying out the invention]

[0015] The following describes embodiments according to the present invention in detail. The following embodiments are examples of some representative embodiments of the present invention, and various modifications can be made within the scope of the present invention. The term "cholesteric liquid crystal layer" alone includes both the L-form and the R-form of the cholesteric liquid crystal layer. The terms "L-form" and "R-form" are synonymous when simply referred to as "L-form" and "R-form," respectively. The term "near" means that there is a tolerance of 1 to 10 nm before and after each of the above wavelength bands. The term "adjustment" means adjusting the system to a desired hue value or optical characteristics by including dyes, etc. The term "hue" means the classification of the color itself based on the Munsell color system's hue circle, etc. The term "tone" means the lightness or intensity of a color.

[0016] <Optical laminate> The optical laminate of the present invention, when used as eyewear, is composed of a support, a light-reflecting layer, a polarizing layer, and a support, in that order from the incident light side, with each layer laminated via an adhesive layer. Examples of embodiments of the optical laminate of the present invention are described below, but are not limited to these. In any embodiment, the polarizing layer may have a support on at least one surface of the polarizing film, or a polarizing film without a support may be used. Furthermore, the light-reflecting layer, which consists of multiple cholesteric liquid crystal layers, can be laminated in the order of cholesteric liquid crystal layers R and L according to the optical properties of the optical laminate.

[0017] (First Embodiment) The optical laminate 101 of the first embodiment has a light-reflecting layer 20 which includes at least one cholesteric liquid crystal layer. As shown in Figure 1, the optical laminate 101 is configured as follows, in order from the side where ambient light is incident: a first support 11 / a first adhesive layer 31 / a cholesteric liquid crystal layer R-body 21 (or a cholesteric liquid crystal layer L-body 22) / a second adhesive layer 32 / a second support 12. The first embodiment may also have a polarizing layer. As shown in Figure 2, the optical laminate 101a is configured as follows, in order from the side where ambient light is incident: a first support 11 / a first adhesive layer 31 / a cholesteric liquid crystal layer R-body 21 (or a cholesteric liquid crystal layer L-body 22) / a second adhesive layer 32 / a polarizing layer 40 / a third adhesive layer 33 / a second support 12.

[0018] (Second embodiment) The optical laminate 102 of the second embodiment includes a light-reflecting layer 20 containing two cholesteric liquid crystal layers. As shown in Figure 3, the optical laminate 102 is configured, in order from the ambient light incident side, as follows: first support 11 / first adhesive layer 31 / cholesteric liquid crystal layer R 21 / cholesteric liquid crystal layer L 22 / second adhesive layer 32 / second support 12. The second embodiment may also have a polarizing layer. As shown in Figure 4, the optical laminate 102a is configured, in order from the ambient light incident side, as follows: first support 11 / first adhesive layer 31 / cholesteric liquid crystal layer R 21 / cholesteric liquid crystal layer L 22 / second adhesive layer 32 / polarizing layer 40 / third adhesive layer 33 / second support 12.

[0019] (Third embodiment) The optical laminate 103 of the third embodiment includes a light-reflecting layer 20 containing three cholesteric liquid crystal layers. As shown in Figure 5, the optical laminate 103 is configured, in order from the ambient light incident side, as follows: first support 11 / first adhesive layer 31 / cholesteric liquid crystal layer L body 21 / cholesteric liquid crystal layer R body 22 / cholesteric liquid crystal layer L body 21 / second adhesive layer 32 / second support 12. The third embodiment may also have a polarizing layer. As shown in Figure 6, the optical laminate 103 is configured, in order from the ambient light incident side, as follows: first support 11 / first adhesive layer 31 / cholesteric liquid crystal layer L body 21 / cholesteric liquid crystal layer R body 22 / cholesteric liquid crystal layer L body 21 / second adhesive layer 32 / polarizing layer 40 / third adhesive layer 33 / second support 12.

[0020] As in the embodiments described above, in the optical laminate of the present invention, it is preferable that the light-reflecting layer 20 and the polarizing layer 40 are arranged between the first support 11 and the second support 12 from the viewpoint of mechanical strength and protection of each layer, and these can be appropriately adopted depending on the design and application of the eyewear.

[0021] One embodiment of the optical laminate of the present invention is characterized in that the light-reflecting layer has a reflection band with a full width at half maximum of 40 to 70 nm with respect to the maximum reflection wavelength in the visible light range, and an adhesive layer is provided between the first support of the optical laminate and the light-reflecting layer, the adhesive layer containing at least one dye (reflection hue adjusting dye) that reduces the hue change of the reflection hue of the optical laminate, and the reflection hue adjusting dye has a maximum absorption wavelength that is 30 to 140 nm shorter wavelength away from the maximum reflection wavelength of the light-reflecting layer. By using such an optical laminate, the reflectance of the light-reflecting layer can be reduced because the reflection band of the light-reflecting layer, which shifts to the shorter wavelength side with tilting, overlaps with the absorption wavelength range of the reflection hue adjusting dye. This makes it possible to create an optical laminate that can reduce the hue change of the light-reflecting layer when viewed at an angle.

[0022] One embodiment of the optical laminate of the present invention is such that, when the maximum reflection wavelength of the light-reflecting layer is 600 to 700 nm, the first adhesive layer includes, as the reflection hue adjusting dye, the dye described in (A) below which an anthraquinone skeleton is present, or dye (A) and the dye described in (E) below which a tetraazaporphyrin skeleton is present. (A) Red pigments (with maximum absorption wavelengths in the 500-550 nm wavelength range) (E) Purple pigments (with maximum absorption wavelengths in the 570-600 nm wavelength range) By creating such an optical laminate, it is possible to reduce the hue change of the light-reflecting layer when viewed at an angle in the red-based reflective hue, thereby creating an optical laminate that is easily visible. Furthermore, by including dye (E) together with dye (A), it is possible to create a reflective hue that exhibits a deep red color.

[0023] One embodiment of the optical laminate of the present invention is such that, when the maximum reflection wavelength of the light-reflecting layer is 500 to 600 nm, the adhesive layer contains the dye described in (D) below, which has a styryl skeleton, as the reflection hue adjusting dye. (D) Yellow pigments (with maximum absorption wavelengths in the 400-450 nm wavelength range) By creating such an optical laminate, it is possible to reduce the hue change of the light-reflecting layer when viewed at an angle, in the case of yellow-green or green reflective hues, resulting in an optical laminate that is easily visible.

[0024] One embodiment of the optical laminate of the present invention is such that the reflected hue when the optical laminate is tilted 60° from the vertical to the horizontal is L, as shown in the following formula (1). * a * b * Reflected hue value (a) in the color space (CIE 1976) * r and b * Saturation c calculated from r) * At r, when the inclination angle is 50 degrees, c * When r = 50 or less and the inclination angle is 60 degrees, c *r=20 or less. By creating such an optical laminate, the hue of the light-reflecting layer when viewed at an angle is made darker, reducing the apparent hue change of the light-reflecting layer and improving visibility.

[0025] (Number 1)c * r={(a * r) 2 +(b * r) 2} 1 / 2 ...(1)

[0026] Furthermore, in another embodiment of the optical laminate of the present invention, at least one of the second and third adhesive layers contains at least one dye (transmittance hue adjusting dye) that corrects the transmitted hue of the optical laminate shifted by the addition of the above-mentioned reflection hue adjusting dye, and the transmission hue adjusting dye is a dye selected from (F) to (I) below, and the transmitted hue of the optical laminate is L * a * b * Hue values ​​(a) in the color space (CIE 1976) * s and b * In s), a * s = -5.0 to 5.0, b * It is preferable that s = -5.0 to 5.0. (F) Red pigments (with maximum absorption wavelengths in the 400-500 nm wavelength range) (G) Green pigments (with maximum absorption wavelengths in the 500-600 nm range) (H) Blue pigments (with maximum absorption wavelengths in the 600-700 nm wavelength range) (I) Yellow pigments (with maximum absorption wavelengths in the 400-450 nm wavelength range) By using such an optical laminate, even when a reflective hue-adjusting dye is used in the first adhesive layer, the transmitted hue of the optical laminate can be corrected, maintaining visibility with minimal coloration, or it can be designed to meet signal visibility standards.

[0027] (adhesive layer) The adhesive layer is used to bond the support, the polarizing film, and the light-reflecting layer (each layer of the cholesteric liquid crystal layer). The adhesive layer can be an adhesive containing at least a base polymer (hereinafter also referred to as the main component) and a curing aid such as a crosslinking agent. Depending on the diluent components of the adhesive, it may be water-based, solvent-based, or solvent-free, and can be appropriately selected according to the surface properties of the adherend and the curing method. Considering compatibility with the reflection hue-adjusting dyes described later, the adhesive layer used in this invention is preferably a solvent-based or solvent-free adhesive layer, and a solvent-based adhesive is particularly preferred due to the ease of preparing the dye dissolving solution and adjusting the dye concentration and transmittance in the system. Hereinafter in this invention, a water-based adhesive layer may be referred to as a "water-based adhesive layer."

[0028] Furthermore, from the viewpoint of improving the efficiency of the lamination process and facilitating the consideration of compositions that establish interlayer adhesion, UV-curing adhesives including radical polymerization type and / or cationic polymerization type may be used, and among these, solvent-free UV-curing adhesives can be particularly favored.

[0029] The adhesive layer is used to ensure tight adhesion between the support and the polarizing film, between the support and the light-reflecting layer, or between one support and another. Furthermore, when a TAC-based resin film is used as the support for the optical laminate, a water-based adhesive layer may be used to laminate the polarizing film or the TAC-based resin films together. The water-based adhesive layer may also be used in combination with a solvent-based or solvent-free adhesive layer. When laminating cholesteric liquid crystal layers together, an ultraviolet-curing adhesive may be used.

[0030] As solvent-based or solvent-free adhesive layers, transparent photocurable resins or thermosetting resins can preferably be used as the main component. Examples include acrylic resins, urethane resins, epoxy resins, silicone resins, rubber resins, polyvinyl ether resins, and polyester resins. In particular, lens processing using optical laminates and lens substrates involves heat-induced shaping and integral molding with resin, as described later. Therefore, from the viewpoint of these moldability requirements, thermosetting resins are preferred for the adhesive layer, and among them, amorphous polyester resins are particularly preferred.

[0031] The amorphous polyester resin is preferably soluble in organic solvents, has a mass-average molecular weight of 15,000 to 30,000, and a glass transition temperature of -20°C to 20°C. Due to these properties, it offers excellent lens processability and interlayer adhesion, and layers can be easily formed by the coating method described later. Examples of commercially available amorphous polyester resins include the "Byron" series (product numbers: 200, 240, 245, 500, etc.) manufactured by Toyobo MC Co., Ltd. These products offer excellent transparency and durability, especially in optical applications.

[0032] Amorphous polyester resins may have a curing agent added along with a diluent. While there are no particular restrictions on the type of curing agent, isocyanate compounds are preferred. This allows the curing reaction to proceed rapidly, forming a strong adhesive layer. Furthermore, curing aids (also called curing catalysts) may be added to accelerate curing and control physical properties. The diluent is not particularly limited as long as it dissolves the resin and various additives, but methyl ethyl ketone (MEK), cyclopentanone (CPN), cyclohexanone (CHN), etc., can be used. These solvents have excellent volatility and solubility, contributing to faster drying after application and improved efficiency in the manufacturing process. The viscosity of the adhesive composition is typically 300 to 600 mPa·s, preferably in the range of 300 to 400 mPa·s. Within this range, fluidity during application and uniformity of film thickness after drying are ensured.

[0033] The solvent-based adhesive layer is formed by applying the adhesive composition onto a base substrate so that the film thickness after solvent removal is 5 to 50 μm, preferably 10 to 30 μm. The base substrate refers to one on which the adhesive composition is directly applied to form the adhesive layer. In the present invention, the adhesive composition may be applied directly onto a support, or it may be applied to a polyethylene terephthalate (PET) resin film (also called a release film) coated with a release agent, and then the adhesive layer may be transferred to a polarizing film surface or a support surface, etc.

[0034] The adhesive composition applied to the base substrate can be dried by holding it at a temperature of 40 to 140°C, preferably 80 to 130°C, for 1 to 3 minutes to remove the solvent, thereby obtaining the adhesive layer of the present invention. In order to form an adhesive layer with a good surface texture, it is preferable to use multiple drying ovens and perform the drying in stages from low to high temperature. Furthermore, the adhesive layer is laminated with the air surface facing the surface of the support or polarizing film that will become the bonded surface of the optical laminate described later.

[0035] After lamination, an aging treatment may be performed 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 for the adhesive layer according to the present invention, it is preferable to keep it in a constant temperature bath at 25 to 50°C, preferably 35 to 40°C, for about 1 day to 1 week. In the present invention, from the viewpoint of improving the adhesion between each layer, it is preferable to perform the aging treatment after lamination of one surface of the support to be bonded and the polarizing film surface via the aforementioned adhesive layer.

[0036] The adhesive layer can be formed using known coating methods such as flow coating, spray coating, bar coating, gravure coating, roll coating, blade coating, air knife coating, lip coating, comma coating, and die coating. Each of these coating methods has different characteristics and is selected according to the material used and the purpose. For example, the flow coating method is suitable for obtaining a uniform film thickness, and the spray coating method can handle substrates with complex shapes. Bar coating and gravure coating methods allow for high-precision coating, and the roll coating method is suitable for mass production. Blade coating and air knife coating methods are excellent for thin film formation, and lip coating, comma coating, and die coating methods can handle high-viscosity materials. In particular, in the present invention, the optimal adhesive layer can be formed by selecting the comma coating method or die coating method.

[0037] (Reflection hue adjustment dye) Reflective hue-adjusting dyes are dyes that have a maximum absorption wavelength (also called λmax) in the visible light range and are used to reduce hue changes in the reflected hue of optical laminates. In the present invention, it is preferable to include the dye in the adhesive layer from the viewpoint of ease of hue design of the optical laminate. Furthermore, one or more types of the dye may be blended into the adhesive layer depending on the optical design. In addition, it is preferable that the dye does not interact with the optical laminate in a way that causes decomposition or aggregation during processing of the optical laminate or lens molding process, and that the dye has high compatibility or dispersibility with the resin components of the adhesive layer. This ensures stable product quality and guarantees long-term performance.

[0038] As such a pigment, "resin coloring dyes" can be preferably used. Resin coloring dyes have good compatibility with amorphous polyester resins and excellent color development in the resin, so the amount of dye needed for hue adjustment can be reduced. As a result, the adhesive layer formed is not affected by the addition of the dye and can maintain sufficient adhesion strength for the formation of an optical laminate. As a specific example, when Solvent Yellow 33 is added to an amorphous polyester resin, a vivid yellow color can be produced with a small amount of dye. In this case, by keeping the amount of dye within the range described later, a laminate with excellent optical properties can be formed without affecting the mechanical properties or adhesive strength of the resin.

[0039] It is preferable to include the reflective hue adjusting dye in the adhesive layer (first adhesive layer) between the first support and the light-reflecting layer in the optical laminate. This reduces the change in reflective hue when the light-reflecting layer of the optical laminate is tilted.

[0040] Specifically, it is preferable to use a reflective hue-adjusting dye that has a maximum absorption wavelength set 20 to 150 nm, more preferably 30 to 140 nm, shorter than the maximum reflection wavelength of the light-reflecting layer. By including such a reflective hue-adjusting dye in the first adhesive layer, when the reflection band of the light-reflecting layer shifts to the shorter wavelength side due to angle dependence, the shifted reflection band and the absorption band of the reflective hue-adjusting dye overlap, thereby reducing the reflectance of the light-reflecting layer when tilted. This affects the chroma value shown in Equation 1. If the distance between the maximum reflection wavelength of the light-reflecting layer and the maximum absorption wavelength of the reflection hue-adjusting dye is less than 20 nm, or if they are nearly identical, the reflectivity of the light-reflecting layer in the front direction will also decrease, resulting in a loss of decorative properties as a light-reflecting layer. If the distance between the maximum reflection wavelength of the light-reflecting layer and the maximum absorption wavelength of the reflection hue-adjusting pigment exceeds 150 nm, not only will the effect of reducing the change in reflection hue when tilted be lost, but the reflection hue of the original light-reflecting layer will be colored to a different shade.

[0041] The full width at half maximum (FWHM) of the maximum absorption wavelength of the reflectivity hue-adjusting dye is preferably 30 nm to 150 nm, more preferably 30 nm to 100 nm. If the FWHM is narrower than 30 nm, it will overlap the reflection band of the light-reflecting layer in the front direction, reducing the reflectivity and causing the decorative properties of the light-reflecting layer to be lost. If the FWHM is wider than 150 nm, it will not be able to cover the reflection wavelength shift due to the angle dependence of the light-reflecting layer, reducing the effect of mitigating the change in reflected hue when tilted.

[0042] The reflective hue-adjusting dye is a dye having absorption properties corresponding to the reflection properties of the above-mentioned light-reflecting layer. For example, the adjustment is performed by including one or more dyes selected from (A) to (D) below in the adhesive layer. Furthermore, the reflective hue-adjusting dye is not limited to (A) to (D), and other dyes exhibiting the same type of color or dyes having multiple light absorption wavelength ranges may be used as long as they satisfy the objectives of the present invention.

[0043] (A) Dyes that exhibit a red color (with λmax in the wavelength range of approximately 500-550 nm); for example, 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. (B) Dyes that exhibit a green color (with λmax in the wavelength range of around 500-600 nm); for example, Solvent Green 3, Solvent Green 20, and Solvent Green 28. (C) Dyes that exhibit a blue color (with λmax in the wavelength range of around 600-700 nm); for example, Disperse Blue 14, Solvent Blue 94, Solvent Blue 63, Solvent Blue 104, and Solvent Blue 97. (D) Dyes that exhibit a yellowish color (with λmax in the wavelength range of approximately 380-500 nm); for example, Solvent Yellow 33, Disperse Yellow 54, Disperse Yellow 160, Disperse Yellow 201, and Solvent Orange 60.

[0044] Furthermore, the reflective hue adjusting dye is not limited to (A) to (D) above, and other dyes exhibiting the same type of color or dyes having multiple light absorption wavelength ranges may be used as long as they satisfy the objectives of the present invention. Examples of other resin coloring dyes include Disperse Violet 13, Disperse Violet 28, and Solvent Violet 36.

[0045] The reflective hue-adjusting dye has an anthraquinone skeleton, and (A) for red dyes, Solvent Red 168 shown in chemical formula (1) is preferably used; (B) for green dyes, Solvent Green 28 shown in chemical formula (2) is preferably used; and (C) for blue dyes, Solvent Blue 97 shown in chemical formula (3) is preferably used. In addition, for yellow dyes, (D) for yellow dyes, Disperse Yellow 201 shown in chemical formula (4), which has a styryl skeleton, is preferably used. The amount of each dye added is, for example, 0.001 to 0.5 parts by mass, preferably 0.002 to 0.4 parts by mass, per 100 parts by mass of the main component of the adhesive.

[0046] [ka]

[0047] [ka]

[0048] [ka]

[0049] [ka]

[0050] As the above-mentioned reflective hue adjusting dyes, for example, Solvent Red 168 can be replaced with Plast Red 8320 from Arimoto Chemical Industry Co., Ltd.'s Plast Blue series, Solvent Green 20 with Plast Green 8645 from the same company, Solvent Blue 97 with Plast Blue 8590 from the same company, and Disperse Yellow 201 with Plast Yellow 8070 from the same company.

[0051] The reflective hue-adjusting dye can also be the dye (E). Such dyes may be used in combination with other reflective hue-adjusting dyes, allowing for more precise absorption of specific reflection bands in the light-reflecting layer and enabling the design of more decorative reflective hues. (E) Purple pigments (with maximum absorption wavelengths in the 570-600 nm wavelength range)

[0052] The reflective hue-adjusting dye is preferably one that has a λmax in the wavelength range of 570 to 600 nm or less, or 400 nm to 450 nm, and has a full width at half maximum of approximately 10 nm to 60 nm. For example, it can be selected from dyes such as cyanine-based, merocyanine-based, squarylium-based, xanthene-based, oxonol-based, azo-based, tetraazaporphyrin-based, and polymethine-based dyes, and in particular, tetraazaporphyrin-based dyes represented by chemical formula (5) and exhibiting a purple color can be suitably used. Depending on the optical design, one or more types may be incorporated into the adhesive layer.

[0053] [ka] (In formula (5), R1 to R8 each independently represent a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxyl group, an amino group, a carboxyl group, a sulfonic acid group, a linear, branched, or cyclic alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a monoalkylamino group having 1 to 20 carbon atoms, a dialkylamino group having 2 to 20 carbon atoms, a dialkylamino group having 7 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group having 6 to 20 carbon atoms, an alkylthio group having 6 to 20 carbon atoms, or an arylthio group having 6 to 20 carbon atoms, and may form rings other than aromatic rings via linking groups, and M represents two hydrogen atoms, a divalent metal atom, a divalent monosubstituted metal atom, a tetravalent disubstituted metal atom, or an oxy metal atom.)

[0054] Furthermore, it is preferable that the tetraazaporphyrin dye has a positional isomer structure of a tert-butyl group (t-C4H9 group) substituted at one of the positions of R1 and R2, R3 and R4, R5 and R6, and R7 and R8 in formula (5), respectively, in formula (5).

[0055] Examples of commercially available tetraazaporphyrin dyes include FDG-005 and FDG-006 manufactured by Yamada Chemical Industries, Ltd. The λmax of these dyes in the resin is 585 nm for FDG-005 and 595 nm for FDG-006. The amount of dye incorporated into the adhesive layer should be such that the transmittance at λmax in the adhesive layer is 5 to 70%, preferably 30 to 60%, to provide excellent anti-glare effects in eyewear. Specifically, the amount of dye incorporated is 0.01 to 0.20 parts by mass, preferably 0.05 to 0.15 parts by mass, per 100 parts by mass of the main component of the adhesive layer.

[0056] When the maximum reflection wavelength of the light-reflecting layer is 600 to 700 nm, the first adhesive layer preferably contains the dye described in (A) above as the reflection hue adjusting dye. Such a light-reflecting layer exhibits a reddish color, and the hue change when observed from an oblique direction is reduced. Furthermore, the first adhesive layer preferably contains the dye described in (E) above in addition to the dye described in (A). Such a light-reflecting layer exhibits reduced hue change when observed from an oblique direction, and furthermore, the reflection band is narrowed by the dye described in (E), allowing it to exhibit a red color with high color purity.

[0057] When the maximum reflection wavelength of the light-reflecting layer is 500 to 600 nm, the first adhesive layer preferably contains the dye described in (D) above as the reflection hue adjusting dye. Such a light-reflecting layer exhibits a yellowish-green or green color, and the hue change when observed from an oblique direction is reduced.

[0058] (Transparent hue adjustment dye) Transmitted hue-adjusting dyes are dyes used to adjust the coloration of the scenery viewed through an optical laminate or a lens containing such a laminate. Furthermore, transmitted hue-adjusting dyes also play a role in correcting the coloration of transmitted light from an optical laminate that has been colored using reflected hue-adjusting dyes.

[0059] The same pigments as the reflectivity-adjusting pigments can be used for the transmission-adjusting pigments. The optical properties of the optical laminate are adjusted using transmission-adjusting pigments by using one or more pigments corresponding to each wavelength range in the visible light region, as shown in (F) to (I) above, based on the transmittance waveform of the optical laminate, and incorporating them into the adhesive layer. This allows the transmittance waveform to be adjusted across the visible light region by reducing the transmittance in the wavelength range corresponding to the λmax of each pigment, and enabling the design of any desired hue and tone.

[0060] The transmissive hue-adjusting dye is not limited to (F) to (I), and other dyes exhibiting the same color or dyes having multiple light absorption wavelength ranges may be used as long as they satisfy the objectives of the present invention.

[0061] It is preferable to include the transmissive hue-adjusting dye between the light-reflecting layer and the polarizing layer (second adhesive layer) and / or between the polarizing layer and the second support (third adhesive layer) in the optical laminate.

[0062] Furthermore, it is particularly preferable to adjust the composition of the transmitted hue-adjusting pigment so that the transmitted hue when worn as eyewear falls within the relative luminous efficiency attenuation rate (Q value) specified in JIS T7333, for example, regarding the visibility of traffic signals.

[0063] Specifically, it is preferable to adjust the transmitted hue of the optical laminate so that each Q value is greater than or equal to the values ​​shown below. The optical laminate of the present invention is particularly suitable as eyewear for use when driving an automobile, as it conforms to such standards for signal visibility. Furthermore, the degree of polarization only needs to have sufficient polarization performance as sunglasses, preferably with Py being 70% or more, more preferably 80% or more, and even more preferably 90% or more. Qred (red): 0.8 Qyellow:0.6 Qgreen (green): 0.6 Qblue:0.4

[0064] (light reflective layer) The light-reflecting layer used in the present invention includes at least one cholesteric liquid crystal layer R with a right-handed helical direction or a cholesteric liquid crystal layer L with a left-handed helical direction.

[0065] A cholesteric liquid crystal layer is obtained by coating a composition containing a cholesteric liquid crystal onto a substrate or the like, and fixing the helical orientation state in a film or movie form. The cholesteric liquid crystal consists of a chiral nematic liquid crystal or a compound in which a chiral agent is added to a nematic liquid crystal. Since the direction of the helix or the reflection wavelength can be arbitrarily designed by the type or amount of chiral agent, a cholesteric liquid crystal obtained by adding a chiral agent to a nematic liquid crystal is preferred. Unlike liquid crystals that are manipulated by so-called electric fields, the nematic liquid crystal is used with its helical orientation state fixed, so it is preferable that the nematic liquid crystal monomer has polymerizable groups.

[0066] A nematic liquid crystal monomer having a polymerizable group is a compound that has a polymerizable group in its molecule and exhibits liquid crystalline properties within a specific temperature or concentration range. Examples of polymerizable groups include (meth)acryloyl groups, vinyl groups, chalconyl groups, cinnamoyl groups, or epoxy groups. Furthermore, it is preferable to have a mesogenic group in the molecule in order to exhibit liquid crystalline properties. A mesogenic group refers to a rod-shaped or plate-shaped substituent such as a biphenyl group, terphenyl group, (poly)benzoate phenyl ester group, (poly)ether group, benzylideneaniline group, or acenaphthoquinoxaline group, or a disc-shaped substituent such as a triphenylene group, phthalocyanine group, or azacrown group, i.e., a group that has the ability to induce liquid crystal phase behavior. Liquid crystal compounds having rod-shaped or plate-shaped substituents are known in the art as calamistic liquid crystals. Examples of nematic liquid crystal monomers having such polymerizable groups include polymerizable liquid crystals described in Japanese Patent Publication No. 2003-315556 and Japanese Patent Publication No. 2004-29824, as well as the PALIOCOLOR series (manufactured by BASF) and the RMM series (manufactured by Merck). These nematic liquid crystal monomers having polymerizable groups can be used individually or in combination.

[0067] As a chiral agent, the nematic liquid crystal monomer having the polymerizable group described above can be oriented in a right-handed (R-form) or left-handed (L-form) helical orientation, and compounds having polymerizable groups are preferred, similar to the nematic liquid crystal monomer having polymerizable groups. Examples of such chiral agents include Paliocolor LC756 (manufactured by BASF) and compounds described in Japanese Patent Application Publication No. 2002-179668. The type of chiral agent determines the direction of the reflected circularly polarized light, and furthermore, the reflection wavelength of the cholesteric liquid crystal layer can be changed depending on the amount of chiral agent added to the nematic liquid crystal. For example, the more chiral agent added, the more a cholesteric liquid crystal layer that reflects shorter wavelengths can be obtained. The amount of chiral agent added varies depending on the type of chiral agent and the wavelength to be reflected, but in order to adjust the central reflection wavelength of the cholesteric liquid crystal layer for normal light to a desired wavelength range, it is preferably 0.5 to 30 parts by mass, more preferably 1 to 20 parts by mass, and even more preferably 3 to 10 parts by mass, per 100 parts by mass of polymerizable nematic liquid crystal monomer.

[0068] Furthermore, it is possible to add polymerizable compounds that do not possess liquid crystalline properties but can react with nematic liquid crystal monomers having polymerizable groups. Examples of such compounds include polymerizable compounds that form UV-curable resins. Examples of UV-curable resins include dipentaerythritol hexa(meth)acrylate, reaction products of dipentaerythritol penta(meth)acrylate and 1,6-hexamethylene diisocyanate, reaction products of isocyanuric ring triisocyanate and pentaerythritol tri(meth)acrylate, reaction products of pentaerythritol tri(meth)acrylate and isophorone diisocyanate, dipentaerythritol penta(meth)acrylate, dipentaerythritol tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, tris(acryloxyethyl)isocyanurate, and tris(meth) Cryloxyethyl) isocyanurate, reaction product of glycerol triglycidyl ether and (meth)acrylic acid, caprolactone-modified tris(acryloxyethyl) isocyanurate, reaction product of trimethylolpropane triglycidyl ether and (meth)acrylic acid, triglycerol di(meth)acrylate, reaction product of propylene glycol diglycidyl ether and (meth)acrylic acid, polypropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, reaction product of 1,6-hexanediol diglycidyl ether and (meth)acrylic acid, 1,6-Hexanediol di(meth)acrylate, glycerol di(meth)acrylate, reaction product of ethylene glycol diglycidyl ether and (meth)acrylic acid, reaction product of diethylene glycol diglycidyl ether and (meth)acrylic acid, bis(acryloxyethyl)hydroxyethyl isocyanurate, bis(methacryloxyethyl)hydroxyethyl isocyanurate, reaction product of bisphenol A diglycidyl ether and (meth)acrylic acid, tetrahydrofurfuryl(meth)acrylate, caprolactone-modified tetrahydrofurfuryl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, polypropylene glycol(meth)acrylate, polyethylene glycol(meth)acrylate, phenoxyhydroxypropyl(meth)acrylate Examples include acrylates, acryloylmorpholine, methoxypolyethylene glycol (meth)acrylate, methoxytetraethylene glycol (meth)acrylate, methoxytriethylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methoxyethyl (meth)acrylate, glycidyl (meth)acrylate, glycerol (meth)acrylate, ethyl carbitol (meth)acrylate, 2-ethoxyethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, 2-cyanoethyl (meth)acrylate, reaction products of butyl glycidyl ether and (meth)acrylic acid, butoxytriethylene glycol (meth)acrylate, or butanediol mono(meth)acrylate, which can be used individually or in combination. These UV-curable resins that do not possess liquid crystalline properties must contain nematic liquid crystal monomers having polymerizable groups in an amount that does not cause them to lose their liquid crystalline properties. Preferably, the amount is 0.1 to 20 parts by mass, more preferably 1.0 to 10 parts by mass, per 100 parts by mass of nematic liquid crystal monomers having polymerizable groups.

[0069] When nematic liquid crystal monomers or other polymerizable compounds having polymerizable groups are UV-curable, a photopolymerization initiator is added to cure the composition containing them by UV light. Examples of photopolymerization initiators include acetophenone compounds such as 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane-1, 1-hydroxycyclohexylphenyl ketone, 4-(2-hydroxyethoxy)-phenyl(2-hydroxy-2-propyl)ketone, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, diethoxyacetophenone, benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and 2,2-dimethoxy-2-phenylacetophenone. Examples include benzophenone compounds such as benzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, 4-benzoyl-4'-methyldiphenyl sulfide, and 3,3'-dimethyl-4-methoxybenzophenone (KayaCure MBP, manufactured by Nippon Kayaku Co., Ltd.), as well as thioxanthone compounds such as thioxanthone, 2-chlorthioxanthone (KayaCure CTX, manufactured by Nippon Kayaku Co., Ltd.), 2-methylthioxanthone, 2,4-dimethylthioxanthone (KayaCure RTX, manufactured by Nippon Kayaku Co., Ltd.), isopropylthioxanthone, 2,4-diclothioxanthone (KayaCure CTX, manufactured by Nippon Kayaku Co., Ltd.), 2,4-diethylthioxanthone (KayaCure DETX, manufactured by Nippon Kayaku Co., Ltd.), or 2,4-diisopropylthioxanthone (KayaCure DITX, manufactured by Nippon Kayaku Co., Ltd.).Preferably, examples include Omnirad® TPO, Omnirad TPO-L, Omnirad OXE01, Omnirad OXE02, Omnirad 1300, Omnirad 184, Omnirad 369, Omnirad 379, Omnirad 819, Omnirad 127, Omnirad 907, or Omnirad 1173 (all manufactured by IGM Resins BV), and particularly preferably Omnirad TPO, Omnirad TPO-L, Omnirad OXE01, Omnirad OXE02, Omnirad 1300, or Omnirad 907. These photopolymerization initiators can be used individually or in any combination in any proportion.

[0070] When using benzophenone-based or thioxanthone-based compounds as photopolymerization initiators, it is possible to use auxiliary agents in combination to promote the photopolymerization reaction. Examples of such auxiliary agents include amine compounds such as triethanolamine, methyldiethanolamine, triisopropanolamine, n-butylamine, N-methyldiethanolamine, diethylaminoethyl methacrylate, Michler ketone, 4,4'-diethylaminophenone, ethyl 4-dimethylaminobenzoate, (n-butoxy)ethyl 4-dimethylaminobenzoate, or isoamyl 4-dimethylaminobenzoate.

[0071] The amounts of the photopolymerization initiator and auxiliary agent added are preferably within a range that does not affect the liquid crystalline properties of the composition containing the nematic liquid crystal monomer. The amount is preferably 0.5 parts by mass to 10 parts by mass, and more preferably 2 parts by mass to 8 parts by mass, per 100 parts by mass of the ultraviolet-curable compound in the composition. The amount of the auxiliary agent is preferably 0.5 to 2 times the amount of the photopolymerization initiator.

[0072] The composition further contains a solvent. Such a solvent is not particularly limited as long as it can dissolve the liquid crystal compound, chiral agent, etc. used, and examples include methyl ethyl ketone, toluene, methyl isobutyl ketone, cyclopentanone, acetone, and anisole, with cyclopentanone being preferred due to its good solubility. These solvents can be added in any proportion, and one type may be added, or multiple solvents may be used in combination. These solvents are dried out in a drying oven or drying equipment of a film coating apparatus.

[0073] A method for producing the cholesteric liquid crystal layer used in the present invention using the above-mentioned cholesteric liquid crystal is, for example, to add the required amount of a chiral agent that is right-handed or left-handed so as to reflect a desired wavelength to a nematic liquid crystal monomer having polymerizable groups. Next, these are dissolved in a solvent and a photopolymerization initiator is added. After that, it is preferable to apply this solution to a plastic substrate such as a polyethylene terephthalate (PET) film so as to be as uniform in thickness as possible, and leave the coating film for a certain period of time under temperature conditions that cause the cholesteric liquid crystal to form on the substrate and orient at a desired helical pitch while removing the solvent by heating.

[0074] The thickness of the cholesteric liquid crystal layer after deposition is preferably 1 μm to 15 μm, and more preferably 2 μm to 10 μm. By maintaining a film thickness within this range, a uniform film thickness can be maintained, variations in the reflected wavelength can be suppressed, the desired wavelength can be efficiently reflected, and a constant mechanical strength can be maintained.

[0075] Furthermore, the configuration of the cholesteric liquid crystal layer in the optical laminate may include both a cholesteric liquid crystal layer R and a cholesteric liquid crystal layer L in order to impart high polarization characteristics when laminated with a polarizing film, depending on the eyewear design. Alternatively, if polarization characteristics are not a concern, only one of the light-reflecting layers, either the cholesteric liquid crystal layer R or the cholesteric liquid crystal layer L, may be provided. Moreover, these configurations are not particularly limited as long as they achieve the effects of the present invention, and any of them can be used. The cholesteric liquid crystal surface laminated with the polarizing film has no change in optical properties regardless of the lamination order, so either the L or R form may be used.

[0076] The lamination of the L-body and R-body may be formed using an adhesive layer, such as an ultraviolet-curing adhesive or a polyester resin, as described later, or it may be formed by directly applying the other cholesteric liquid crystal composition to the liquid crystal surface after forming the L-body (or R-body).

[0077] From the viewpoint of application to eyewear requiring a high degree of polarization, the cholesteric liquid crystal layer preferably has a maximum reflectivity of 90% or less for incident light, more preferably 80% or less, and even more preferably 70% or less. A maximum reflectivity of 90% or less allows for a high degree of polarization to be obtained. Incident light refers to light that is incident perpendicularly on the optical laminate. Furthermore, "maximum reflectivity" refers to the maximum reflectivity of the optical laminate in the wavelength range of 380 nm to 780 nm, and "minimum reflectivity" refers to the minimum reflectivity of the optical laminate in the wavelength range of 380 nm to 780 nm.

[0078] In the present invention, the cholesteric liquid crystal layer exhibits a desired hue, and the full width at half maximum (FWHM) of the cholesteric liquid crystal layer with respect to the maximum reflection wavelength is preferably 20 to 100 nm, more preferably 30 to 80 nm, and even more preferably 40 to 70 nm. By having the FWHM with respect to the maximum reflection wavelength in the range of 40 to 70 nm, a cholesteric liquid crystal layer exhibiting any hue can be produced, and a cholesteric liquid crystal layer with a narrower FWHM can exhibit a reflective hue with higher color purity.

[0079] The light-reflecting layer may comprise a set of multiple cholesteric liquid crystal layers R and L having different central reflection wavelengths. Specifically, when the cholesteric liquid crystal layers R and L have central reflection wavelengths of X nm, respectively, and are designated as RX and LX, for example, to obtain a reddish reflection hue, a laminate exhibiting a reddish reflection color at that reflection wavelength can be obtained by stacking a set of R620 and L650. In this case, the full width at half maximum of the light-reflecting layer is obtained from the maximum reflection wavelength measured as a laminate. To obtain a yellowish-green reflection hue, a laminate exhibiting a yellowish-green reflection color at that reflection wavelength can be obtained by stacking a set of R510 and L550. In this case, the full width at half maximum of the light-reflecting layer is obtained from the maximum reflection wavelength measured as a laminate. To obtain a greenish reflection hue, a laminate exhibiting a greenish reflection color at that reflection wavelength can be obtained by stacking a set of R550 and L550. In this case, the half-width of the light-reflecting layer is assumed to be obtained from the maximum reflection wavelength when measured as a laminate. In addition, by stacking R450 and L450 combinations and R650 and L650 combinations, it is possible to reflect light around 450nm and around 650nm simultaneously. There are no particular restrictions on these combinations, and a wide variety of reflective hues can be obtained by using these combinations.

[0080] (Polarizing layer) The polarizing layer includes not only the polarizing film described below, but also embodiments in which one side of the polarizing film is laminated with a third support, and embodiments in which both sides of the polarizing film are sandwiched between a third support and a fourth support. Embodiments of polarizing layers having these supports are generally also called "polarizing plates."

[0081] (Polarizing film) A polarizing film is an absorption-type polarizing film containing at least one dichroic dye consisting of iodine and / or an organic dye. Typical polarizing films include polyvinyl alcohol (PVA) based polarizing films and coated polarizing films, with PVA-based polarizing films being suitably used. Polarizing films are also generally called polarizing films. A known stretching method can be applied to manufacture PVA-based polarizing films, which involves adsorbing a dye-based dichroic dye onto a resin film containing PVA or its derivatives (hereinafter, both referred to as PVA-based resin films), and then stretching and oriented the film uniaxially by about 2 to 6 times. At this time, the film thickness of the polarizing film is generally 5 to 30 μm. A commercially available PVA-based resin film is, for example, Kuraray's VF-PS#7500 (film thickness 75 μm). Furthermore, to improve the performance of the polarizing film, it is important to pay attention to the following points. First, when selecting a dichroic dye, it is desirable to choose one that has a wide absorption wavelength band and exhibits a high degree of polarization. Also, in the stretching process, temperature control and adjustment of the stretching speed are necessary to achieve uniform stretching. This will improve the uniformity and performance of the polarizing film.

[0082] The aforementioned dichroic dye is preferably an azo compound or a salt thereof as an organic dye, from the standpoint of hue design, and furthermore, from the standpoint of heat resistance, it is preferable to use a direct dye having a sulfonic acid group. A PVA-based polarizing film containing such a dye-based dichroic dye is also called a dye-based polarizing film, and in a form having a support, it is also called a dye-based polarizing plate.

[0083] Examples of such dichroic pigments include CIDirect Yellow 12, CIDirect Yellow 28, CIDirect Yellow 44, CIDirect Yellow 142, CIDirect Orange 26, CIDirect Orange 39, CIDirect Orange 71, CIDirect Orange 107, CIDirect Red 2, CIDirect Red 31, CIDirect Red 79, CIDirect Red 81, CIDirect Red 117, CIDirect Red 247, CIDirect Green 80, CIDirect Green 59, CIDirect Blue 71, CIDirect Blue 78, CIDirect Blue 168, CIDirect Blue 202, CIDirect Violet 9, CIDirect Violet 51, CIDirect Brown 106, and CIDirect Brown 223.

[0084] In addition, dichroic dyes may be dyes that can be produced by known methods, such as the method described in Japanese Patent Publication No. 3-12606 or the method described in Japanese Patent Publication No. 59-145255. Commercially available dyes include Kayafect® Violet P Liquid (manufactured by Nippon Kayaku Co., Ltd.), Kayafect Yellow Y and Kayafect Orange G, Kayafect Blue KW and Kayafect Blue Liquid 400.

[0085] The hue of the polarizing film can be any hue depending on the eyewear design, but typically, gray tones are used to suppress color distortion in the field of view and obtain comfortable visibility. "Gray tones" generally refers to a color between white and black (generally called gray, achromatic, or neutral gray), or L obtained from the transmittance of the polarizing film alone. * a* b * Hue value a in the color space (JIS Z 8781-4:2013 CIE 1976) * s and b * This refers to values ​​where s is in the range of -5 to 5, more preferably -3 to 3. In addition, the hue of the polarizing film may be one with a hue such as brown, depending on the eyewear design and the visibility of the field of view.

[0086] In the case of dye-based polarizing films, for example, a "colored" polarizing film can be formed that exhibits red, blue, yellow, orange, and green hues by including at least one of the dichroic dyes exemplified above. Furthermore, dye-based polarizing films can be made by combining multiple of these dyes to form gray hues or other hues and tones. In particular, when mixing multiple dyes, generally, based on the principle of the three primary colors, at least three dyes with λmax in the wavelength bands of approximately 380-430 nm, 430-580 nm, and 580-680 nm are used to adjust the optical properties (mainly the luminous efficiency correction transmittance Ys and luminous efficiency correction polarization degree Py), hue (for example, in the CIE1976 color space (L)) according to the application and design of eyewear products such as polarized sunglasses. * a * b * The desired values ​​(and so on) can be designed using a color system.

[0087] In the preparation of a dye-based polarizing film, when using a PVA-based polarizing film, a dyeing solution is prepared by dissolving at least one dye in water or the like in the stretching method described above. As a dyeing step, the film is immersed in the dyeing solution to allow the dye to be adsorbed 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.

[0088] The polarizing film used in the present invention has optical properties of Ys=25-45% and Py=90% or more, or Ys=40-60% and Py=60% or less, and preferably exhibits a gray hue from the viewpoint of not affecting the field of vision of the eyewear wearer. By having such a hue, hue design using the above-mentioned transmittance hue adjustment dye becomes easier. Examples of commercially available gray dye-based polarizing films for polarized sunglasses include Grey-30 (Ys=30.0%, Py=99.9%) and NYSH-30 (Ys=38.0%, Py=99.0%) manufactured by Nippon Kayaku Co., Ltd., which are made of PVA resin film.

[0089] (Support) The support is an optically transparent resin material used to protect the polarizing film and to provide rigidity to the lens and enable integral molding. The support is a transparent resin material in the form of a film or sheet, and typical examples include materials containing polycarbonate (PC) resin, triacetylcellulose (TAC) resin, polyamide (PA) resin, etc. The total light transmittance of the support is preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more to ensure good visibility. Furthermore, if the optimal processing temperature of the optical laminate described later is low, it is preferable to select, for example, an aromatic PCC composition (total alicyclic polyester composition) or a PA resin with a glass transition temperature of 130°C or lower. The film thickness of the support is usually 10 to 200 μm, preferably 40 to 100 μm, and film or sheet materials are preferably used. Furthermore, when selecting the support, it is desirable to select a material with heat resistance and chemical resistance appropriate to the usage environment.

[0090] In the case of PC resins, it is more preferable to use aromatic PC composed of bisphenol A. Aromatic PC based on bisphenol A has high transparency and excellent mechanical strength, making it suitable for optical applications. It also has excellent heat resistance and impact resistance, making it usable in a variety of environments. As a commercially available PC resin film, Teijin's PC-2151 (film thickness 125 μm) can be used. This film has high transparency and excellent mechanical properties, exhibiting high performance in optical applications. Furthermore, because the film thickness is 125 μm, it combines appropriate rigidity and flexibility, and has excellent processability.

[0091] As the TAC resin, TAC films used as supports for polarizing plates used in liquid crystal display devices can be preferably used. When laminating this film with a polarizing film, it is generally preferable to saponify the film with an alkaline aqueous solution and bond it with a water-based adhesive. Saponification improves the hydrophilicity of the film surface and enhances adhesion with the adhesive, thereby improving the reliability of the laminate. Examples of commercially available TAC films include P980RR (film thickness 80 μm) and P960GL (film thickness 80 μm) from TacBright, TD80U (film thickness 80 μm) from Fujifilm, and KC2UA (film thickness 25 μm), KC4UY (film thickness 40 μm), and KC6UAW (film thickness 60 μm) from Konica Minolta Opto. These films each have different film thicknesses and can be selected according to the application.

[0092] Examples of PA-based resins include nylon containing an aliphatic skeleton and aramid composed solely of an aromatic skeleton. Examples of nylon include nylon 6, nylon 11, nylon 12, and nylon 66. These nylons possess excellent mechanical strength and heat resistance, making them suitable for a variety of industrial applications. For example, nylon 6 has high abrasion resistance, while nylon 12 is characterized by low water absorption and excellent chemical resistance. Examples of aramid include para-aramid and meta-aramid. Commercially available PA-based resin films include LOFO's TRF-800 (film thickness 80 μm), etc. This film possesses high mechanical strength and excellent heat resistance, making it suitable for optical and industrial applications.

[0093] (Method of manufacturing optical laminates) The method for manufacturing an optical laminate includes (1) a step of forming a polarizing film, (2) a step of forming a cholesteric liquid crystal layer as a light-reflecting layer, (3) a step of forming an adhesive layer, and (4) a step of laminating the support, the polarizing film, and the light-reflecting layer using the adhesive layer. For example, the steps may be carried out sequentially starting from the step of forming the polarizing film, or each step may be carried out sequentially. In addition, each layer of the optical laminate may be surface-modified during or before the bonding step using a commercially available treatment device such as corona treatment or plasma treatment to improve adhesion.

[0094] (3) The step of forming the adhesive layer preferably includes a step of dissolving various dyes in a solvent and then mixing the dissolved solution with the main component of the adhesive layer, from the viewpoint of simplicity of the manufacturing process and quality stability. Specifically, the dyes are dissolved using the same diluting solvent used for the main component as described above, and this dye dissolved solution is incorporated into the main component or main component solution. This allows the dyes to be uniformly mixed into the main component. In the present invention, "dissolution" also means a uniform dispersion state.

[0095] Furthermore, each dye may be dissolved using the same diluent, and each dye dissolution may be mixed simultaneously or sequentially into the main component or main component solution. Alternatively, a dye dissolution may be prepared by mixing all the dyes together using the same diluent, and then mixed into the main component or main component solution.

[0096] The following describes an example of manufacturing an optical laminate according to the first embodiment, but the types and amounts of various materials are not limited to those described below.

[0097] (1) In the process of forming the polarizing film, a gray PVA-based polarizing film with predetermined optical properties is used as the polarizing film using a dichroic dye, and a TAC-based resin film is used as the third support. A polarizing film having the support on only one side is obtained via an aqueous adhesive layer using a PVA-based resin material as described in known polarizing plate manufacturing methods. Next, in the step of (2) forming a cholesteric liquid crystal layer as a light-reflecting layer, a composition consisting of polymerizable nematic liquid crystal monomer and a chiral agent is applied to a PET substrate that has undergone rubbing treatment, and the coating film in a helical orientation state is fixed on the substrate by ultraviolet irradiation. At this time, the direction of the helical direction and the reflection wavelength can be arbitrarily designed by the type and amount of chiral agent, so a desired chiral agent is selected to obtain a cholesteric liquid crystal layer. When cholesteric liquid crystal layer R and cholesteric liquid crystal layer L have a central reflection wavelength of X nm, respectively, if you want to design a reddish reflection color, the reflection wavelength X of R and L is set to 600-700 nm, and if you want to design a greenish reflection color, the reflection wavelength X of R and L is set to 500-600 nm, thereby obtaining a cholesteric liquid crystal layer with the desired reflection color. Next, in step (3) forming the adhesive layer, adhesive layer a containing a dye such as a reflective hue adjusting dye and adhesive layer b without the dye are prepared. Each adhesive layer has the same formulation except for the use of a dye. First, in the case of b, a main component solution is prepared using an amorphous polyester resin as the main component, cyclohexanone as a diluent, isocyanate as a curing agent, and dibutyltin dilaurate (DBSn) as a curing catalyst. At this time, the various materials are mixed in the following proportions: amorphous polyester resin 100 parts by mass, cyclohexanone 20 to 40 parts by mass, preferably 25 to 35 parts by mass, polyisocyanate compound solution (590E manufactured by Soken Chemical Co., Ltd.) 1 to 3 parts by mass, preferably 1.5 to 2.5 parts by mass, and DBSn 0.005 to 0.02 parts by mass, preferably 0.008 to 0.015 parts by mass. This is the adhesive composition (b). Next, as adhesive layer a, a dye dissolving solution containing Solvent Red 168 as a reflective hue adjusting dye and a tetraazaporphyrin-based dye (FDG-006) is prepared and blended into the above adhesive composition (b). At this time, with amorphous polyester resin as 100, the diluting solvent is mixed in a ratio of 1 to 25 parts by mass, preferably 5 to 18 parts by mass, Solvent Red 168 in a ratio of 0.001 to 0.8 parts by mass, preferably 0.01 to 0.5 parts by mass, and tetraazaporphyrin-based dye in a ratio of 0.001 to 0.8 parts by mass, preferably 0.01 to 0.5 parts by mass. By uniformly mixing the above main agent solution and dye solution, an adhesive composition (a) containing the main agent and dye can be prepared. Next, in the step of laminating the support, polarizing film, and light-reflecting layer using adhesive layers (4), adhesive compositions (a) and (b) are first applied to the release film, respectively. In the drying step, the solvent is evaporated from the coated film using multiple drying ovens set to a temperature range of 40°C to 100°C to form adhesive layers a and b, respectively. At this time, the amount of adhesive applied is adjusted so that the thickness of each adhesive layer after drying is 20 to 30 μm. Subsequently, these adhesive layers are used to laminate the first support in order, and an optical laminate can be obtained having the configuration of first support / adhesive layer a / light-reflecting layer / adhesive layer b / third support / polarizing film / adhesive layer b / second support.

[0098] (Optical measurement of optical laminates) The present invention describes a method for measuring the optical properties (reflection hue and transmission hue) of an optical laminate. The properties of the optical laminate, and the evaluation of its reflection properties, may be performed not only on the optical laminate but also on the first support / adhesive layer / light-reflecting layer and the lens, as long as it does not interfere with the measurement.

[0099] (Evaluation of reflected hue) This section explains how to evaluate the reflective hue of an optically laminated material. The reflectance of an optical laminate can be measured in accordance with JIS Z8722:2009, for example, using a Hitachi High-Tech Science UH4150 spectrophotometer. The reflectance measurement is performed by total internal reflection, with the surface of the light-reflecting layer placed on the integrating sphere of the spectrophotometer. In this case, natural light is used as the light source, and the reflectance is measured by placing the measurement sample at 0 degrees and 90 degrees, and the average of the reflectances is taken. Furthermore, by setting the detection conditions for the reflectance of each wavelength to a pitch of 10 nm or less, preferably 5 nm or less, the accuracy of calculating the transmittance difference can be improved, and the difference with visual evaluation can be reduced.

[0100] The angle dependence of an optical laminate can be quantitatively evaluated using, for example, a Konica Minolta motor-driven goniometer (DMS series). Specifically, the measurement is performed in reflection mode, and as shown in Figure 7, the reflected light from the reflective surface of a sample 53 placed flat on the measurement stage 50 can be measured by the light-receiving unit of the device. At this time, the light-receiving unit can be tilted at any angle (0 degrees (or represented by the symbol "°") to 70 degrees) with respect to the sample surface. Here, a tilt angle of 0 degrees is perpendicular to the sample surface. The measurement stage 30 can also be rotated horizontally in any direction (0 degrees to 359 degrees, where 0 degrees is the initial placement position of the sample 33). In Figure 7, the light-receiving unit 51 of the measurement device is shown at a tilt angle of 0 degrees, and the light-receiving unit 52 of the measurement device is shown when tilted at an angle θ. The tilt direction of the light-receiving unit 52 is the 0-degree or 180-degree direction of the measurement stage 50. The reflectance values ​​obtained from this measurement can be obtained as wavelength-dependent values, and thus the optical properties (mainly luminous efficiency-corrected reflectance Yr) and the CIE1976 (JIS Z8781-4) color space (L) can be used. * a * b * The hue value can be determined based on the following equation (2). Yr can be calculated from equation (2) below.

[0101] TIFF2026090165000007.tif9170Tr···Reflectance (%) at each wavelength obtained by reflectance measurement s(λ)···The spectral distribution of standard light used for color representation. TIFF2026090165000008.tif1321···Color matching functions in the XYZ color system TIFF2026090165000009.tif8170···Weight coefficient for D65 light source according to JIS Z8722

[0102] Since the measurement of the angle dependence of the reflected hue takes into account the characteristics of lenses or eyewear having a curved shape, the hue change when the tilt angle is 20 degrees or more, preferably 40 degrees or more, corresponds to the actual curved shape. For example, if the hue change is relatively small compared to the hue before tilting, even at larger tilt angles, the effects of the present invention can be expected in lenses or eyewear with a large curve diameter.

[0103] The curvature of a lens or eyewear is measured, for example, using a curve meter (model 340) manufactured by Sun Nishimura Co., Ltd. A larger number indicates a greater curvature, meaning that the radius R of the circle, where the curvature is the arc length of the circle, is smaller. The standard curvature value (degree of curvature) of lenses or eyewear is generally in the range of 2 to 8 curves, and in particular, sports eyewear is designed with a 4 to 8 curve to have a shape that easily covers the face.

[0104] Changes in the reflected hue of the light-reflecting layer are particularly noticeable in eyewear and lenses when the curve value is between 4 and 8. Therefore, when measuring the angle dependence of the reflected hue of an optical laminate, the hue change that becomes prominent when tilted above a certain angle can be evaluated as corresponding to the hue change observed when the optical laminate is actually molded into eyewear or lenses.

[0105] The change in reflected hue due to angle dependence is in the CIE1976 (JIS Z8781-4) color space (L * a * b * Using the hue value based on ), the hue system can be identified from the following equation (3). That is, if the angle (hue angle h) obtained from equation (3) is within a predetermined range, even if the measured hue values ​​are different, they can be visually perceived as having the same hue system in sensory evaluation. This indicates that it has a predetermined hue.

[0106] (Math 3) h = tan -1 (b * r / a * r)···(3) However, h is a* r·b * In r coordinates, positive a * It is expressed as an angle value converted from 0 to 359 degrees counterclockwise, with the r direction being 0 degrees.

[0107] By using the hue angle h, representative hues can be shown within the following angle range. The term "system" means that the hue in question is centered around the hue in question and belongs to the same hue system. Furthermore, the relationship between angle values ​​and hue is shown as a guideline for identification and is not limited to the following. Red color range: 0-30 degrees and 315-359 degrees Yellow: 31~74 degrees Green tones: 75-164 degrees Blue color: 165~270 degrees

[0108] Furthermore, the evaluation of the reflective hue of the optical laminate is L * a * b * Hue values ​​(a) in the color space (CIE 1976) * r and b * Saturation c calculated from r) * This can be shown using r. Saturation c * r is shown in Equation 1 above, and the closer the value is to 0, the darker the color tone becomes. In other words, the light-reflecting layer of the optical laminate of the present invention makes it difficult to perceive hue changes that would normally be visible when observed from an oblique direction, by reducing the saturation. Here, "darkening of the color tone" means that the color appears to be colorless or approaches a dark color such as gray.

[0109] In measuring the angle dependence of the reflected hue of the optical laminate described above, the saturation c of the reflected hue changed significantly when the optical laminate was tilted at an angle greater than a predetermined angle. * r is preferably 50 or less, and more preferably 20 or less. By setting the saturation in this way, even if the reflected hue shifts to another hue when observed from an oblique direction at the hue angle h shown in Equation 3, the sensory evaluation can make it appear as if the hue has not changed while maintaining the same hue family.

[0110] (Evaluation of transmitted hue) This section explains how to measure the transmitted hue of an optical laminate. The transmittance of an optical laminate can be measured, for example, using a spectrophotometer UH4150 manufactured by Hitachi High-Tech Science Corporation. In this case, natural light is used as the light source, and the measurement sample is placed in the visible light range (wavelength range of 400 nm to 700 nm, or 380 nm to 780 nm) so that the transmission axis or absorption axis is at 0 and 90 degrees. The transmittance of each sample is then measured under predetermined detection conditions. The average of these transmittances is obtained as the transmittance of the optical laminate. From the obtained transmittance, the luminous efficiency-corrected single-layer transmittance Ys (unit: %, the term "single" refers to the case of one polarizing film), luminous efficiency-corrected polarization degree Py (unit: %), and hue (JIS Z 8781-4:2013 CIE 1976 L) are calculated. * a * b * Values ​​such as those obtained using the color space can be calculated.

[0111] <Lens> The lens can be obtained by integrally molding the optical laminate of the present invention with a lens substrate in a desired shape, such that the light-reflecting layer faces the side where external light is incident. This light-reflecting layer has the property of reflecting light of a specific wavelength and transmitting light of other wavelengths, thus improving visibility. Furthermore, a polarized lens can be obtained by integrally molding an optical laminate having a polarizing layer with a lens substrate. This polarizing layer transmits only light from a specific direction, thus reducing glare and maintaining a clear field of vision. These lenses can be used in both single-lens and double-lens types of eyewear, such as sunglasses, goggles, and helmet visors. In particular, in sports and outdoor activities, these lenses play a role in improving the user's visibility and enhancing safety. The following is an example of the lens formation process according to the present invention, but is not limited to this example.

[0112] For example, sunglasses can be manufactured by punching out the optical laminate for eyewear of the present invention into a desired shape and then bending it. There are no particular restrictions on the bending method; the bending process can be carried out in a way that allows for the creation of a spherical or aspherical shape depending on the purpose.

[0113] Specifically, the optical laminate is pre-shaped using a hot press or the like to facilitate processing it into a lens shape in combination with the lens substrate described later. Generally, a mold designed to a predetermined size is used for the shaping process, and is appropriately designed to match the design of the eyewear product. The optical laminate can be curved by placing it in a bending mold (concave mold) and pressing it with a hemispherical mold (convex mold, also called a hot iron ball) heated to a predetermined temperature.

[0114] The bending process conditions are determined by considering factors such as the flexibility and heat resistance (discoloration of the polarizing film, etc.) of the optical laminate, with a temperature of 70 to 120°C, preferably 80 to 100°C, and a time of 1 to 3 minutes. At this time, only a portion of the optical laminate to be used in the next insert molding process may be trimmed simultaneously or sequentially from the sheet-like optical laminate.

[0115] The bent product may be further injected with resin (also called lens substrate). In this case, there is the advantage that the thickness unevenness of the optical laminate for eyewear of the present invention becomes invisible, and resin injection is used in products that have impact resistance even in lenses that do not have focal refractive power, and are particularly excellent in appearance and reduction of eye strain. As for the resin to be injected, it is preferable to use the same material as the layer in contact with the injected resin in order to prevent deterioration of appearance due to differences in refractive index.

[0116] The lens substrate is a resin material used to integrate the optical laminate and resin of the present invention and process them into a lens shape. Generally, insert molding can be used for this integration process. There are no particular restrictions on the lens substrate; for example, thermoplastic resins that can be molded by injection molding, or thermosetting resins commonly used for eyewear lenses that can be molded by casting polymerization, etc., can be used. Examples include (meth)acrylic resins such as methyl methacrylate homopolymers and copolymers of methyl methacrylate with one or more other monomers; diethylene glycol bisallyl carbonate resins such as diethylene glycol bisallyl carbonate homopolymers and copolymers of diethylene glycol bisallyl carbonate with one or more other monomers; polysulfide resins such as acrylonitrile-styrene copolymers, halogen-containing copolymers, monomer homopolymers having sulfide bonds, and copolymers of monomers having sulfide bonds with one or more other monomers; polyurea resins; PA resins; PC resins; polystyrene resins; polyolefin resins; polyvinyl chloride resins; polyester resins; PET resins; polyurethane resins; sulfur-containing urethane resins such as polythiourethane resins; and epoxy resins. From the viewpoint of adhesion to the optical laminate, it is preferable that the lens substrate be made of the same material as the layer it is in contact with. As a specific example, by using a PA resin for the support of the optical laminate to be integrally processed, and similarly using a PA resin for the lens substrate, the support and the lens substrate can be fused together. This makes it possible to obtain a lens in which the optical laminate and the lens substrate are integrated into one unit.

[0117] <Eyewear> Eyewear comprises lenses and a frame that secures the lenses. The frame can be made in various shapes, such as square or round. This allows for designs that suit the user's preferences and intended use. The surface of the lenses is appropriately coated with a hard coat, anti-reflective coating, etc. The hard coat protects the lens surface from scratches and improves durability. The anti-reflective coating reduces light reflection on the lens surface and improves visibility. Next, the edges of the lenses are smoothed and shaped to fit the frame. This process involves a polishing process to ensure the lenses fit securely into the frame, a drilling process to create holes in the lenses at the necessary positions for screws and other fasteners, and a screw tightening process to secure the lenses to the frame using screws, thereby ensuring that the lenses are stably fixed and do not come loose from the frame.

[0118] Furthermore, the eyewear of the present invention may contain, in addition to the above-mentioned ultraviolet absorber for ultraviolet absorption ability, dyes, metal oxides, etc. for infrared absorption function, or photochromic materials for photochromic function, in any layer of the optical laminate or lens substrate.

[0119] Specifically, UV absorbers protect the eyes from ultraviolet rays by incorporating a layer containing the UV absorber, maintaining eye health even with prolonged use. Common UV absorbers include benzophenone and benzotriazole compounds. Infrared absorbing dyes and metal oxides reduce the effects of heat from infrared rays and provide comfortable vision by incorporating a layer containing dyes or metal oxides with infrared absorbing properties. Photochromic materials change lens color according to light intensity by incorporating a layer containing photochromic materials with light-adjusting properties, becoming darker in bright places and brighter in dark places, thus providing optimal vision at all times. Eyewear with these functions can protect the user's eyes and provide comfortable vision in various environments. It is particularly effective in outdoor activities, sports, and daily life. [Examples]

[0120] The present invention will be illustrated in detail below with reference to examples. The present invention is not limited to these examples.

[0121] (A) Fabrication of a cholesteric liquid crystal layer In accordance with Example 1 of Japanese Patent Application Publication No. 2003-139953, cholesteric liquid crystal layers were fabricated on a rubbing-treated PET film (Toyobo Co., Ltd., A4160, film thickness 50 μm) as a substrate. These layers included right-handed helical orientation with maximum reflect lengths of 510, 550, and 650 nm (sample names R510, R550, and R650), and left-handed helical orientation with maximum reflect lengths of 510 and 620 nm (sample names L510 and L620). All of these cholesteric liquid crystal layers had a film thickness of approximately 4 μm. The Ys, transmitted hue value, Py, Yr, and reflected hue values ​​of these cholesteric liquid crystal layers were measured using a Hitachi High-Tech Science Co., Ltd. UH4150 spectrophotometer, and the measurement results are shown in Table 1. Furthermore, the maximum reflection wavelength and the corresponding full width at half maximum were determined from the reflection spectrum in the above reflection measurement.

[0122] [Table 1]

[0123] In Table 1, the cholesteric liquid crystal layers R510, R550, and L510 exhibited a green hue when observed from the front. The cholesteric liquid crystal layers L620 and R650 exhibited a red hue when observed from the front.

[0124] (B) Preparation of polarizing film As the polarizing film, NYSH-30, a dye-based PVA resin film manufactured by Nippon Kayaku Co., Ltd. for polarized sunglasses, was used. When the polarization characteristics of this polarizing film were measured using a Hitachi High-Tech Science Co., Ltd. UH4150 spectrophotometer, the Ys was 38.0% and the Py was 99.50%. At this time, the L of the polarizing film alone was also measured. * a* b * Hue in a color space is a * s = -1.1, b * The value of s was 5.3, and the color was in the gray range.

[0125] Next, the fabrication of the optical laminates of Examples 1-4 and Comparative Examples 1-4 will be described.

[0126] [Example 1] (1) Preparation of adhesive composition 1 Adhesive composition 1 was obtained by mixing an organic solvent-soluble polyester resin (Byron 500, manufactured by Toyobo Co., Ltd., with a resin solids content of 44.9%), which served as the main component of the adhesive, with 2 wt% isocyanate-based curing agent (590E, manufactured by Soken Chemical Co., Ltd.), 0.01 wt% dibutyltin dilaurate (DBSn), 0.708 wt% Solvent Red 168 as a reflectance hue adjusting dye, and 11 wt% cyclohexanone as a diluent. Here, the dye was dissolved in the diluent beforehand, and then mixed with the main component by mixing this solution with the main component to ensure uniform mixing. The viscosity of the obtained adhesive composition 1 was measured with a viscometer TVB-10M manufactured by Toki Sangyo Co., Ltd. and was 350 mPa·s. At this time, when the adhesive composition was formed on the first support under the conditions described in manufacturing method (4) and measured as the first adhesive layer, the optical properties were as follows: the maximum absorption wavelength was 516 nm, the transmittance at the maximum absorption wavelength was 42.7%, and L * a * b * The hue value in the color space is a * =29.4, b * The result was -2.5.

[0127] (2) Preparation of adhesive composition 2 To an organic solvent-soluble polyester resin (Byron 500, manufactured by Toyobo Co., Ltd., with a resin solids content of 44.9%) which serves as the main component of the adhesive, 2 wt% of an isocyanate-based curing agent (590E, manufactured by Soken Chemical Co., Ltd.), 0.01 wt% of dibutyltin dilaurate (DBSn), and 11 wt% of cyclohexanone as a diluent were mixed to obtain a colorless and transparent adhesive composition 2. The viscosity of adhesive composition 2 was measured using a viscometer TVB-10M manufactured by Toki Sangyo Co., Ltd. and was 350 mPa·s.

[0128] (3) Fabrication of the light-reflecting layer Using L620 prepared in (A) above as the first cholesteric liquid crystal layer and R650 prepared in (A) above as the second cholesteric liquid crystal layer, a light-reflecting layer with an L620 / R650 configuration sandwiched between PET substrates was fabricated by laminating the respective liquid crystal surfaces using the ultraviolet-curing adhesive described in Example 1 of International Publication WO2019 / 116760. The maximum reflection wavelength of the obtained light-reflecting layer was 651 nm, and the full width at half maximum at that wavelength was 65 nm.

[0129] (4) Fabrication of optical stacks As the first support, a TAC-based film (TD-80UL, manufactured by Fujifilm Corporation, film thickness 80 μm) that had been saponified (immersed in a 2 N sodium hydroxide aqueous solution at 40°C for 10 minutes) was coated with the adhesive composition 1 by die coating using a die coater method. The coated film was dried at 100°C for 3 minutes to remove the solvent, thereby forming an adhesive layer 1 (film thickness 18 μm) on the TAC-based film. Next, the PET substrate on the L620 side of the light-reflecting layer prepared in (3) was peeled off, and the liquid crystal layer of L620 and the adhesive layer 1 were bonded together to obtain a laminate consisting of the first support / first adhesive layer / L620 / R650 / PET substrate. Subsequently, the PET substrate on the R650 side was peeled off, and the liquid crystal surface of R650 and the polarizing film NYSH-30 were laminated using the ultraviolet-curing adhesive described in Example 1 of International Publication WO2019 / 116760 to create a laminate consisting of a first support / first adhesive layer / L620 / R650 / polarizing film.

[0130] Next, the adhesive composition 2 was applied to one side of a PA resin film (TRF-800 manufactured by LOFO, with a film thickness of 80 μm) as a second support using a die coater method. The coated film was dried at 100°C for 3 minutes to remove the solvent, forming a second adhesive layer (film thickness of 18 μm) on the PA resin film. Subsequently, the polarizing element side of the laminate prepared above was bonded to the adhesive layer 2 to obtain the optical laminate of the present invention, which, in order from the ambient light incident side, consists of the first support / first adhesive layer / L620 / R650 / polarizing film / second adhesive layer / second support. Furthermore, the obtained optical laminate was held at 35°C for one week as an aging treatment to promote the curing reaction of the adhesive layer and to improve the adhesion between each support and the light reflective layer.

[0131] [Example 2] (1) Preparation of adhesive composition 1 The procedure is the same as in Example 1 (1), except that Solvent Red 168 was added in a ratio of 0.532 wt% and FDG-006 manufactured by Yamada Chemical Co., Ltd. in a ratio of 0.355 wt% to the main component of the adhesive as a reflective hue adjusting dye. At this time, when the adhesive composition was formed on the first support under the conditions described in the preparation method (4) and measured as the first adhesive layer, the optical properties were as follows: the maximum absorption wavelength was 586 nm, the transmittance at the maximum absorption wavelength was 46.4%, and L * a * b * The hue value in the color space is a * =32.2, b * The result was -20.2.

[0132] (2) Preparation of adhesive composition 2 This is the same as (2) in Example 1.

[0133] (3) Fabrication of the light-reflecting layer This is the same as (3) in Example 1.

[0134] (4) Fabrication of optical stacks Using the adhesive composition 1 of (1) in Example 2 as the first adhesive layer, an optical laminate was obtained in the order from the external light incident side as the first support / the first adhesive layer / L620 / R650 / polarizing film / the second adhesive layer / the second support, which was the same as (4) in Example 1 except for this.

[0135] [Example 3] (1) Preparation of Adhesive Composition 1 Except that Disperse Yellow 201 was used as the reflective hue adjusting dye at 0.178 wt%, it was the same as (1) in Example 1. At this time, when the optical properties were measured with the adhesive composition formed into a film on the first support under the conditions described in the production method (4) to obtain the first adhesive layer, the maximum absorption wavelength was 455 nm, the transmittance at the maximum absorption wavelength was 36.4%, and the hue value in the L * a * b * hue value in the color space was a * = -12.8, b * = 30.8.

[0136] (2) Preparation of Adhesive Composition 2 It was the same as (2) in Example 1.

[0137] (3) Preparation of Light Reflection Layer Except that L510 prepared in the above (A) was used as the first cholesteric liquid crystal layer and R510 prepared in the above (A) was used as the second cholesteric liquid crystal layer, it was the same as (3) in Example 1. The maximum reflection wavelength of the obtained light reflection layer was 526 nm, and the half value width at that wavelength was 55 nm.

[0138] (4) Preparation of Optical Laminate Using the adhesive composition 1 of (1) in Example 3 as the first adhesive layer and using the light reflection layer of (3) in Example 3, an optical laminate was obtained in the order from the external light incident side as the first support / the first adhesive layer / L510 / R510 / polarizing film / the second adhesive layer / the second support, which was the same as (4) in Example 1 except for this.

[0139] [Example 4] (1) Preparation of Adhesive Composition 1 This is the same as (1) in Example 3.

[0140] (2) Preparation of adhesive composition 2 This is the same as (2) in Example 1.

[0141] (3) Fabrication of the light-reflecting layer The procedure is the same as in Example 1 (3), except that L510 prepared in (A) above was used as the first cholesteric liquid crystal layer and R550 prepared in (A) above was used as the second cholesteric liquid crystal layer. The maximum reflection wavelength of the obtained light-reflecting layer was 546 nm, and the full width at half maximum at that wavelength was 65 nm.

[0142] (4) Fabrication of optical stacks The method is the same as in Example 3 (4), except that an optical laminate is obtained in which the light-reflecting layer of Example 4 (3) is used, and the layers are arranged in the following order from the ambient light incident side: first support / first adhesive layer / L510 / R550 / polarizing film / second adhesive layer / second support.

[0143] [Comparative Example 1] (1) Preparation of adhesive composition 1 The procedure is the same as in Example 1 (1), except that a colorless, transparent adhesive composition was used without incorporating a reflective hue-adjusting dye.

[0144] (2) Preparation of adhesive composition 2 This is the same as (2) in Example 1.

[0145] (3) Fabrication of the light-reflecting layer This is the same as (3) in Example 1.

[0146] (4) Fabrication of optical stacks The procedure is the same as in Example 1 (4), except that the adhesive composition 1 of Comparative Example 1 (1) is used as the first adhesive layer, and an optical laminate is obtained in the following order from the ambient light incident side: first support / first adhesive layer / L620 / R650 / polarizing film / second adhesive layer / second support.

[0147] [Comparative Example 2] (1) Preparation of adhesive composition 1 This is the same as (1) in Comparative Example 1.

[0148] (2) Preparation of adhesive composition 2 This is the same as (2) in Example 1.

[0149] (3) Fabrication of the light-reflecting layer This is the same as (3) in Example 3.

[0150] (4) Fabrication of optical stacks The process is the same as in Example 1 (4), except that the adhesive composition 1 of Comparative Example 1 (1) is used as the first adhesive layer, and the light-reflecting layer of Example 3 (3) is used to obtain an optical laminate consisting of a first support / first adhesive layer / L510 / R510 / polarizing film / second adhesive layer / second support in order from the ambient light incident side.

[0151] [Comparative Example 3] (1) Preparation of adhesive composition 1 This is the same as (1) in Comparative Example 1.

[0152] (2) Preparation of adhesive composition 2 This is the same as (2) in Example 1.

[0153] (3) Fabrication of the light-reflecting layer This is the same as (3) in Example 4.

[0154] (4) Fabrication of optical stacks The process is the same as in Example 1 (4), except that the adhesive composition 1 of Comparative Example 1 (1) is used as the first adhesive layer, and the light-reflecting layer of Example 4 (3) is used to obtain an optical laminate consisting of a first support / first adhesive layer / L510 / R550 / polarizing film / second adhesive layer / second support in order from the ambient light incident side.

[0155] [Comparative Example 4] (1) Preparation of adhesive composition 1 Except that Solvent Blue 97 was used as a reflection hue adjusting dye at a ratio of 0.530 wt% with respect to the main component of the adhesive, it was the same as (1) in Example 1. At this time, when the adhesive composition was formed into a film on the first support under the conditions described in the production method (4) and measured as the first adhesive layer, the optical properties were as follows: the maximum absorption wavelength was 633 nm, the transmittance at the maximum absorption wavelength was 37.6%, and the hue value in the L * a * b * color space was a * = -8.6 and b * = -21.2.

[0156] (2) Production of Adhesive Composition 2 It was the same as (2) in Example 1.

[0157] (3) Production of Light Reflection Layer It was the same as (3) in Example 1.

[0158] (4) Production of Optical Laminate An optical laminate was obtained in the same manner as (4) in Example 1, except that the adhesive composition 1 in (1) of Comparative Example 4 was used as the first adhesive layer, and in order from the outside light incident side, it was the first support / the first adhesive layer / L620 / R650 / polarizing film / the second adhesive layer / the second support.

[0159] Table 2 shows the configuration conditions of the optical laminates produced in Examples 1 to 4 and Comparative Examples 1 to 4. However, the description and arrangement of the adhesive layer when an ultraviolet curable adhesive was used under each condition were omitted. Also, in the optical laminates of Examples 1 to 4 and Comparative Example 4, the difference (Δ, unit: nm, shown as an absolute value) between the maximum absorption wavelength of the first adhesive layer and the maximum reflection wavelength of the light reflection layer was shown.

[0160]

Table 2

[0161] Next, the results of evaluating the optical properties of the optical laminates obtained in Examples 1 to 4 and Comparative Examples 1 to 4 will be described.

[0162] (5) Evaluation of the optical properties of the optical laminate The optical properties of the optical laminate are evaluated using a UH4150 spectrophotometer to measure transmission characteristics (Ys and Py) and reflection characteristics (Yr, L) in the visible light range. * r,a * r and b * r) was confirmed. Furthermore, to evaluate the reflected hue in the front direction of the optical laminate, the optical laminate was placed flat with the side facing the incident external light facing upwards in a room under fluorescent lighting, and its hue was observed visually from a vertical direction. Table 3 shows these evaluation results.

[0163] [Table 3]

[0164] In all of Examples 1 to 4, Ys was in the range of 13-24% and Py was in the range of 90.0-98.1%, making them suitable as optical laminates for polarized sunglasses.

[0165] The optical laminate of Example 1 had a Δ value of 135 nm, and its reflection characteristics were confirmed to exhibit a reddish reflection hue that was not significantly different from that of Comparative Example 1.

[0166] On the other hand, the optical laminate of Example 2 has a Δ value of 67 nm, but its reflection characteristics are better than those of Comparative Example 1 because FDG-006 is used in combination with Solvent Red 168 as a reflection hue adjusting dye in adhesive composition 1. * The value of r is approximately 5.6 points positive, b * The value of r shifted negatively by approximately 3.9 points. As shown in Figure 9, the addition of FDG-006, which has an even narrower light absorption band than in Example 1, resulted in a more efficient overlap between the short-wavelength reflection band of the light reflection layer and the light absorption band of the dye, thus narrowing the red reflection band of the light reflection layer. As a result, the color of the optical laminate in Example 2, when observed from the front, exhibited a more vivid and deeper red than that of Comparative Example 1. From the results of Example 2, in the case of a light reflection layer having such a red reflection hue, it was found that by using FDG-006 with a narrow light absorption band as a reflection hue adjustment dye in the first adhesive layer, it is possible to precisely adjust the wavelength range of the light absorption band. Therefore, in the configuration where the light reflection layer consists only of a cholesteric liquid crystal layer, it has been difficult to design the hue conventionally. However, by providing an adhesive layer containing such a reflection hue adjustment dye, the reflection hue can be easily designed.

[0167] For the optical laminate of Example 3, the Δ value was 71 nm, and it was confirmed that the reflection characteristics exhibited a green-based reflection hue with no significant difference compared to the case of Comparative Example 2.

[0168] For the optical laminate of Example 4, the Δ value was 91 nm, and it was confirmed that the reflection characteristics exhibited a green-based reflection hue with no significant difference compared to the case of Comparative Example 3.

[0169] On the other hand, Comparative Example 4 is a case where the Δ value was set to 20 nm by using Solvent Blue 94 as a reflection hue adjustment dye having a maximum absorption wavelength at 633 nm for the optical laminate. In this case, the reflection performance was significantly reduced with a decrease in Yr, and the front hue exhibited black. Therefore, it was found that the configuration of Comparative Example 4 does not have the effects of the present invention.

[0170] From the above results, even in the case of a configuration of an optical laminate using a reflection hue adjustment dye in the first adhesive layer by selecting a reflection hue adjustment dye according to the reflection characteristics of the light reflection layer so that the Δ value is within 60 to 140 nm as in Examples 1 to 4, it was confirmed that the change in the reflection hue of the light reflection layer can be suppressed and an optical design utilizing the inherent reflection hue can be achieved.

[0171] Next, the results of evaluating the angular dependence of the reflection hue of the optical laminates obtained in Examples 1 to 4 and Comparative Examples 1 to 3 will be described.

[0172] (6) Angular dependence of the reflection hue of the optical laminate The angle dependence of the reflected hue of each optical laminate was evaluated using a Konica Minolta motor-driven goniometer (DMS505). The hue values ​​(a) were measured when the tilt angle of the light-receiving part of the device was in 10-degree increments from 0 to 60 degrees. * r, b * r), saturation value based on Equation 1, and hue angle h(a) based on Equation 3. * r·b * In r coordinates, positive a * The hue value was calculated by converting it to an angle value of 0 to 359 degrees counterclockwise, with the r direction being 0 degrees. The hue value was measured when the stage of the device was rotated to 0 degrees, 45 degrees, and 90 degrees, but since there was no significant difference in each direction, the average value was used. These evaluation results are shown in Table 4.

[0173] [Table 4]

[0174] The optical laminate of Example 1, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 52-66. Visual inspection confirmed that it exhibited a reddish hue, indicating a vivid reflected color. When the tilt angle exceeds 50 degrees, c * r begins to decrease, and at a slope angle of 60 degrees, c * The r value was approximately 14. Visual inspection at this time revealed a yellowish-red color. The h h value indicates that as the inclination angle increases, the hue changes from the reddish region to the yellowish region, but c * Due to the decrease in the r value, the actual change in color perceived by the naked eye was perceived as small.

[0175] The optical laminate of Example 2, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 46-57. Visual inspection confirmed that it exhibited a reddish hue, indicating a vivid reflected color. When the tilt angle exceeds 50 degrees, c * r begins to decrease, and at a slope angle of 60 degrees, c* The r value was approximately 9. Visually, it appeared black at this time. The hue angle value indicates that as the tilt angle increases, the hue changes from the reddish region to the yellowish-green region, but c * Due to the significant decrease in the r value, the actual change in color perceived by the naked eye seemed almost imperceptible.

[0176] The optical laminate of Comparative Example 1, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 45-60. Visual inspection confirmed that it exhibited a reddish hue, similar to Examples 1 and 2, showing a vivid reflective hue. On the other hand, even when the tilt angle exceeded 50 degrees, c * r hardly decreases, and even at a slope angle of 60 degrees, c * The r value was approximately 44. Visually, it appeared greenish at this time. The hue angle value indicates that as the inclination angle increases, the hue shifts from the reddish region to the greenish region, correlating with the actual color change perceived by the eye.

[0177] The optical laminate of Example 3, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 54-91. Visual inspection confirmed that it exhibited a greenish hue, indicating a vivid reflective color. When the tilt angle exceeds 50 degrees, c * r begins to decrease, and at a slope angle of 60 degrees, c * The r value was approximately 10. Visual inspection at this time revealed it to be black. The hue angle value indicates that as the tilt angle increases, the hue changes from the green region to the blue region, but c * Due to the decrease in the r value, the actual change in color perceived by the naked eye was perceived as small.

[0178] The optical laminate of Comparative Example 2, when the tilt angle during measurement is 0 to 40 degrees, c *The r value was approximately 41-75, and visual inspection revealed a greenish hue, confirming that it exhibited a vivid reflective hue, similar to Example 3. On the other hand, even when the tilt angle was greater than 50 degrees, c * r hardly decreases, and even at a slope angle of 60 degrees, c * The r value was approximately 56.9. Visually, it appeared bluish. The h-value of the hue angle indicates that as the tilt angle increases, the hue shifts from the greenish region to the blueish region, which correlates with the actual color change perceived by the eye.

[0179] The optical laminate of Example 4, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 80-91, and visual inspection confirmed that it exhibited a yellowish-green hue, indicating a vivid reflective color. When the tilt angle exceeds 50 degrees, c * r begins to decrease, and at a slope angle of 60 degrees, c * The r value was approximately 14. Visual inspection at this time revealed that it appeared as black, changing from a greenish-black. The hue angle value indicates that as the tilt angle increases, the hue changes from the yellowish-green region to the blue region, but c * Due to the decrease in the r value, the actual change in color perceived by the naked eye was perceived as small.

[0180] The optical laminate of Comparative Example 3, when the tilt angle during measurement is 0 to 40 degrees, c * The r value was approximately 62-77, and visual inspection revealed a yellowish-green hue, confirming that it exhibited a vivid reflective hue, similar to Example 4. On the other hand, even when the tilt angle was greater than 50 degrees, c * r hardly decreases, and even at a slope angle of 60 degrees, c * The r value was approximately 45. Visually, it appeared bluish. The h-value of the hue angle indicates that as the inclination angle increases, the hue shifts from the yellow-green region to the blue region, which correlates with the actual change in color perceived by the eye.

[0181] From the above results, in the optical laminates of Examples 1 to 4, in the configuration using a reflection hue adjusting dye in the first adhesive layer, the light absorption band of the dye and the reflection band of the light reflection layer that shifts to the short wavelength side due to the inclination overlap, resulting in the c * r value has the effect of decreasing. Therefore, although the reflection hue of the light reflection layer of the optical laminates of Examples 1 to 4 has an angle dependence as an inherent property of the cholesteric liquid crystal, the change in the actually visible reflection hue seems to have the same or similar color tone as compared with the configurations of Comparative Examples 1 to 3, or changes to the dark color side from the original color tone, and can be perceived as having a certain hue (color tone).

[0182] Next, the production of the optical laminates of Examples 5 to 8 will be described. Table 5 shows the conditions of the combination of the light reflection layer, adhesive composition 1, and adhesive composition 2 in the following examples.

[0183] [Table 5]

[0184] [Example 5] (1) Preparation of Adhesive Composition 1 It is the same as (1) of Example 1.

[0185] (2) Preparation of Adhesive Composition 2 It is the same as (2) of Example 1, except that Solvent Green 20 is mixed as a reflection hue adjusting dye at a ratio of 0.44 wt% with respect to the main agent of the adhesive. At this time, when the optical properties were measured as the second adhesive layer by forming a film on the second support under the conditions described in the production method (4), the maximum absorption wavelength was 695 nm, the transmittance at the maximum absorption wavelength was 26.6%, L * a * b * The hue value in the color space is a * =-24.8, b * =1.4.

[0186] (3) Preparation of Light Reflection Layer This is the same as (3) in Example 1.

[0187] (4) Fabrication of optical stacks The process is the same as in Example 1(4), except that the adhesive composition 1 from Example 5(1) is used as the first adhesive layer, the adhesive composition 2 from Example 5(2) is used as the second adhesive layer, and an optical laminate is obtained in the following order from the ambient light incident side: first support / first adhesive layer / L620 / R650 / polarizing film / second adhesive layer / second support.

[0188] [Example 6] (1) Preparation of adhesive composition 1 This is the same as (1) in Example 2.

[0189] (2) Preparation of adhesive composition 2 The procedure is the same as in Example 1 (2), except that Solvent Green 20 was used in combination with the main component of the adhesive in a ratio of 0.04 wt% and Disperse Yellow 201 in a ratio of 0.09 wt% as reflective hue adjusting dyes. At this time, when the adhesive composition was formed on the second support under the conditions described in the preparation method (4) and measured as the second adhesive layer, the optical properties were as follows: the maximum absorption wavelength was 447 nm, the transmittance at the maximum absorption wavelength was 49.7%, and L * a * b * The hue value in the color space is a * = -11.4, b * The result was 20.8.

[0190] (3) Fabrication of the light-reflecting layer This is the same as (3) in Example 1.

[0191] (4) Fabrication of optical stacks The process is the same as in Example 1(4), except that the adhesive composition 1 from Example 6(1) is used as the first adhesive layer, the adhesive composition 2 from Example 6(2) is used as the second adhesive layer, and an optical laminate is obtained in the following order from the ambient light incident side: first support / first adhesive layer / L620 / R650 / polarizing film / second adhesive layer / second support.

[0192] [Example 7] (1) Preparation of adhesive composition 1 This is the same as (1) in Example 3.

[0193] (2) Preparation of adhesive composition 2 The procedure is the same as in Example 1 (2), except that Solvent Red 168 was used in combination with the main component of the adhesive in a ratio of 0.09 wt% and Solvent Blue 97 in a ratio of 0.44 wt% as reflective hue adjusting dyes. At this time, when the adhesive composition was formed on the second support under the conditions described in the preparation method (4) and measured as the second adhesive layer, the optical properties were as follows: maximum absorption wavelength was 633 nm, transmittance at the maximum absorption wavelength was 34.8%, L * a * b * The hue value in the color space is a * = -3.7, b * The result was -23.4.

[0194] (3) Fabrication of the light-reflecting layer Except for using L510 and R510 as cholesteric liquid crystals, this is the same as (3) in Example 1.

[0195] (4) Fabrication of optical stacks The process is the same as in Example 1(4), except that the adhesive composition 1 from Example 7(1) is used as the first adhesive layer, the adhesive composition 2 from Example 7(2) is used as the second adhesive layer, and an optical laminate is obtained in the following order from the ambient light incident side: first support / first adhesive layer / L510 / R510 / polarizing film / second adhesive layer / second support.

[0196] [Example 8] (1) Preparation of adhesive composition 1 This is the same as (1) in Example 4.

[0197] (2) Preparation of adhesive composition 2 The procedure is the same as in Example 1 (2), except that Solvent Green 20 was used in combination with the main component of the adhesive in a ratio of 0.09 wt% and Solvent Blue 97 in a ratio of 0.44 wt% as reflective hue adjusting dyes. At this time, when the adhesive composition was formed on the second support under the conditions described in the preparation method (4) and measured as the second adhesive layer, the optical properties were as follows: the maximum absorption wavelength was 633 nm, the transmittance at the maximum absorption wavelength was 28.5%, and L * a * b * The hue value in the color space is a * = -13.9, b * The result was -21.9.

[0198] (3) Fabrication of the light-reflecting layer Except for using L510 and R550 as cholesteric liquid crystals, this is the same as (3) in Example 1.

[0199] (4) Fabrication of optical stacks The process is the same as in Example 1(4), except that the adhesive composition 1 from Example 8(1) is used as the first adhesive layer, the adhesive composition 2 from Example 8(2) is used as the second adhesive layer, and an optical laminate is obtained in the following order from the ambient light incident side: first support / first adhesive layer / L510 / R550 / polarizing film / second adhesive layer / second support.

[0200] (5) Evaluation of the optical properties of the optical laminate Each optical laminate has reflective properties in the visible light range (Yr,L * r,a * r,b * r) Hue and transmission characteristics (Ys, L) when observed from the front * s,a * s,b * s) was measured using a UH4150 spectrophotometer. Furthermore, the hue of the optical laminate was evaluated by visual sensory evaluation, confirming the color when the optical laminate was observed from the front as the reflected hue, and the color of the scenery when an indoor room illuminated by white fluorescent lights was observed from the second support side through the optical laminate as the transmitted hue. Table 6 shows these evaluation results.

[0201] [Table 6]

[0202] According to Table 6, in Example 5, Solvent Green 20 was added to the adhesive composition 2 as a transmittance hue adjusting dye, resulting in a change in the transmittance characteristics. * s and b * As s approached 0, it exhibited a colorless grayish color. Furthermore, even when a transmissive hue-adjusting dye was added to adhesive composition 2, there was no significant effect on the reflected color, and it exhibited a red color equivalent to that of Example 1. In Example 6, by incorporating Disperse Yellow 201 and Solvent Green 20 as transmittance hue adjusting dyes into the adhesive composition 2, the transmittance characteristics were improved. * s and b * As s approached 0, it exhibited a colorless grayish hue. Furthermore, even when a transmissive hue-adjusting dye was added to adhesive composition 2, there was no significant effect on the reflected color, and it exhibited a red color equivalent to that of Example 2. In Example 7, Solvent Blue 97 and Solvent Green 20 were added to the adhesive composition 2 as transmittance hue adjusting dyes, resulting in a change in the transmittance characteristics. * s and b * As s approached 0, it exhibited a colorless grayish color. Furthermore, even when a transmissive hue-adjusting dye was added to adhesive composition 2, there was no significant effect on the reflected color, and it exhibited a green color equivalent to that of Example 3. In Example 8, Solvent Blue 97 and Solvent Red 168 were added to the adhesive composition 2 as transmittance hue adjusting dyes, resulting in a change in the transmittance characteristics. * s and b * As s approached 0, it exhibited a colorless grayish color. Furthermore, even when a transmissive hue-adjusting dye was added to adhesive composition 2, there was no significant effect on the reflected color, and it exhibited a yellowish-green color similar to that of Example 4. [Industrial applicability]

[0203] According to the present invention, it is possible to provide an optical laminate that can suppress changes in the reflected hue when observed from an oblique direction, even when it is equipped with a light-reflecting layer having a cholesteric liquid crystal. Therefore, such an optical laminate exhibits a new reflected hue and can be suitably used in eyewear (sunglasses, goggles, helmet visors, etc.) where decorative appeal and aesthetics are important, as well as in decorative films and the like. Furthermore, according to another aspect of the present invention, it is possible to provide an optical laminate in which the coloration of the transmitted hue of the optical laminate is reduced even when the reflected hue of the optical laminate is adjusted, as well as lenses and eyewear using the same. Furthermore, this optical laminate is expected to have applications in a wide range of industrial fields, including the fashion industry, automotive industry, home appliances, and building materials. For example, it can be used in high-end sunglasses and fashion goggles to achieve both unique design and functionality. It can also be used in helmet visors to provide a stylish appearance for sports and outdoor activities. When used in the interior and exterior of automobiles, it can add new aesthetic value to the car's design and differentiate it from other cars as a decorative film for luxury vehicles. When used in the exterior of home appliances, it can further enhance the appearance of the product. Moreover, when used in the interior and exterior of buildings, it can improve the overall design of the building, leaving a strong impression on visitors, especially in commercial and public facilities. Thus, the optical laminate of the present invention is expected to be used in a wide range of industrial fields, and its range of applications is very broad. [Explanation of Symbols]

[0204] 11 First support 12 Second support 20 Light reflective layer 21 Cholesteric liquid crystal layer R-body 22 Cholesteric liquid crystal layer L-body 31 First adhesive layer 32 Second adhesive layer 33 Third adhesive layer 40 Polarizing layer 101, 101a Optical laminate (first embodiment) 102, 102a Optical laminate (second embodiment) 103, 103a Optical laminate (third embodiment) 50 measurement stages Light receiving section of the measuring device installed at a 510-degree position 52 Light-receiving part of the measuring device when tilted at an angle θ 53 samples 200 Apparatus for measuring the angle dependence of reflected hue

Claims

1. An optical laminate comprising, in order from the side where ambient light is incident, a first support, a light-reflecting layer including a cholesteric liquid crystal layer (R-body) with a right-handed spiral direction and / or a cholesteric liquid crystal layer (L-body) with a left-handed spiral direction, and a second support, each laminated via an adhesive layer, The aforementioned light-reflecting layer has a reflection band with a full width at half maximum of 40 to 70 nm with respect to the maximum reflection wavelength in the visible light range. An adhesive layer is provided between the first support of the optical laminate and the light-reflecting layer, and the adhesive layer contains at least one dye (reflecting hue adjusting dye) that reduces the change in the reflected hue of the optical laminate. The optical laminate is characterized in that the reflective hue adjusting dye has a maximum absorption wavelength that is 30 to 140 nm shorter than the maximum reflection wavelength of the light reflection layer.

2. When the maximum reflection wavelength of the light-reflecting layer is 600 to 700 nm, the adhesive layer comprises, as the reflection hue adjusting dye, the dye described in (A) below having an anthraquinone skeleton, or the dye described in (E) below having a tetraazaporphyrin skeleton, as described in claim 1. (A) Red pigments (with maximum absorption wavelengths in the 500-550 nm wavelength range) (E) Purple pigments (with maximum absorption wavelengths in the 570-600 nm wavelength range)

3. The optical laminate according to claim 1, wherein when the maximum reflection wavelength of the light-reflecting layer is 500 to 600 nm, the adhesive layer contains the dye described in (D) below, which has a styryl skeleton, as the reflection hue adjusting dye. (D) Yellow pigments (with maximum absorption wavelengths in the 400-450 nm wavelength range)

4. The reflected hue when the optical laminate is tilted from the vertical to the horizontal is given by the following formula (1): L * a * b * Reflected hue value (a) in the color space (CIE 1976) * r and b * Saturation c calculated from r) * At r, when the inclination angle is 50 degrees, c * When r = 50 or less and the inclination angle is 60 degrees, c * An optical laminate according to any one of claims 1 to 3, wherein r = 20 or less. (Number 1) c * r = {(a * r) ２ + (b) * r) ２ } １／２ ・・・(1)

5. At least one adhesive layer between the light-reflecting layer and the second support contains at least one dye (transmitting hue-adjusting dye) that corrects the transmitted hue of the optical laminate that has been shifted by the addition of the reflective hue-adjusting dye. The aforementioned transmissive hue-adjusting dye is a dye selected from (F) to (I) below, The transmitted hue of the optical laminate is L ＊ a ＊ b ＊ Hue value (a) in the color space (CIE 1976) ＊ s and b ＊ In s), a ＊ s=-5.0 to 5.0, b ＊ An optical laminate according to any one of claims 1 to 3, wherein s = -5.0 to 5.

0. (F) Red pigments (having maximum absorption wavelengths in the 400-500 nm wavelength range) (G) Green pigments (with maximum absorption wavelengths in the 500-600 nm wavelength range) (H) Blue pigments (with maximum absorption wavelengths in the 600-700 nm wavelength range) (I) Yellow pigments (with maximum absorption wavelengths in the 400-450 nm wavelength range)

6. The optical laminate according to any one of claims 1 to 3, characterized in that it includes a polarizing layer between the light-reflecting layer and the second support.

7. The optical laminate according to claim 5, characterized in that it includes a polarizing layer between the light-reflecting layer and the second support.

8. A lens formed by molding a lens substrate with an optical laminate according to any one of claims 1 to 3.

9. A lens formed by molding a lens substrate and the optical laminate described in claim 5.

10. A lens formed by molding a lens substrate and the optical laminate described in claim 6.

11. A lens formed by molding a lens substrate and the optical laminate described in claim 7.

12. Eyewear comprising the lens described in claim 8.

13. Eyewear comprising the lens described in claim 9.

14. Eyewear comprising the lens described in claim 10.

15. Eyewear comprising the lens described in claim 11.

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