Optical laminate, optical laminate with cover glass, manufacturing methods thereof, and image display device with cover glass

Abstract

To provide an optical laminate in which cracks are suppressed despite being machined, an optical laminate with a cover glass including such an optical laminate, methods for producing these, and an image display device with a cover glass including the optical laminate or the optical laminate with a cover glass. [Solution] The optical laminate of the present invention has a cut optical film and a pressure-sensitive adhesive layer, and the ratio RR / DR of the specular reflectance RR to the diffuse reflectance DR at the cut end surface is 0.15 or more. The optical laminate with cover glass of the present invention has such an optical laminate and a cover glass laminated via another pressure-sensitive adhesive layer arranged on the opposite side of the pressure-sensitive adhesive layer of the optical laminate.

Description

Technical Field

[0001] The present invention relates to an optical laminate, an optical laminate with a cover glass, a method for manufacturing these, and an image display device with a cover glass including these optical laminates or optical laminates with a cover glass.

Background Art

[0002] In image display devices such as mobile phones and notebook personal computers, various optical laminates (for example, polarizing plates) are used to realize image display and / or enhance the performance of the image display. After being cut into a predetermined shape, the optical laminate may be subjected to finishing processing of the cut surface by cutting. Further, in recent years, it may be desired to process the optical laminate into a shape other than a rectangle (non-rectangular processing). In such cutting processing, cutting with an end mill may be performed. However, cracks may occur in the optical laminate cut by an end mill.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention has been made to solve the above conventional problems, and its main object is to provide an optical laminate with cracks suppressed despite being cut, an optical laminate with a cover glass including such an optical laminate, a method for manufacturing these, and an image display device with a cover glass including these optical laminates or optical laminates with a cover glass.

Means for Solving the Problems

[0005] The optical laminate of the present invention has a cut optical film and an adhesive layer, and the ratio RR / DR of the specular reflectance RR to the diffuse reflectance DR at the cut end face is 0.15 or more. In one embodiment, the optical film includes a polarizer. In one embodiment, the optical film further has a protective film on the side opposite to the adhesive layer of the polarizer. In one embodiment, the optical film further has another protective film between the polarizer and the adhesive layer. In one embodiment, the another protective film also serves as a retardation layer. According to another aspect of the present invention, an optical laminate with a cover glass is provided. This optical laminate with a cover glass has the above optical laminate and a cover glass laminated via another adhesive layer disposed on the side opposite to the adhesive layer of the optical laminate. According to still another aspect of the present invention, an image display device with a cover glass is provided. This image display device with a cover glass has a display cell, the above optical laminate disposed on the viewing side of the display cell, and a cover glass disposed on the viewing side of the optical laminate. Another image display device with a cover glass of the present invention has a display cell and the above optical laminate with a cover glass disposed on the viewing side of the display cell.

Advantages of the Invention

[0006] According to the present invention, by setting the ratio RR / DR of the specular reflectance RR to the diffuse reflectance DR at the cut end face in the cut optical laminate to 0.15 or more, cracks (especially cracks after a heat cycle test) can be suppressed. Such an optical laminate can be suitably laminated with a cover glass and can be suitably applied to an image display device with a cover glass.

Brief Description of the Drawings

[0007]

Figure 1

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Figure 8

Mode for Carrying Out the Invention

[0008] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. For ease of viewing, the drawings are schematically represented, and further, the ratios of lengths, widths, thicknesses, etc., and angles, etc. in the drawings are different from the actual ones.

[0009] A. Optical laminate The optical laminate of the present invention has a cut optical film and an adhesive layer. FIG. 1 is a schematic cross-sectional view for explaining the optical laminate according to one embodiment of the present invention. The optical laminate 100 in the illustrated example has an optical film 110 and an adhesive layer 120. Practically, a separator 130 is removably temporarily attached to the surface of the adhesive layer 120. The optical laminate of the present invention can be preferably laminated with a cover glass and can be preferably applied to an image display device with a cover glass.

[0010] Examples of the optical film include any suitable optical film that can be used for applications that require cutting. The optical film may be a film composed of a single layer or a laminate. Specific examples of the optical film include a polarizer, a retardation film, a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface treatment film, and a laminate appropriately laminated according to the purpose (for example, a circular polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel). According to the embodiment of the present invention, in particular, cracks can be significantly suppressed in an optical laminate including an optical film that is likely to shrink, such as a polarizer.

[0011] For example, when the optical film 110 is a polarizing plate, the polarizing plate may have a protective film only on the side opposite to the adhesive layer 120 of the polarizer, may have a protective film only between the polarizer and the adhesive layer 120, or may have protective films on both sides. The protective film provided on the side opposite to the adhesive layer may be subjected to surface treatments such as hard coat treatment, antireflection treatment, anti-sticking treatment, antiglare treatment, etc., as necessary. In one embodiment, the protective film provided between the polarizer and the adhesive layer is preferably optically isotropic. In this specification, "optically isotropic" means that the in-plane retardation Re(550) is 0 nm to 10 nm and the retardation in the thickness direction Rth(550) is -10 nm to +10 nm. In another embodiment, the protective film may also serve as a retardation layer. The configuration of the protective film as a retardation layer may adopt any appropriate configuration according to the purpose. For example, the protective film may be a λ / 2 plate, a λ / 4 plate, or a laminate thereof. The λ / 2 plate and the λ / 4 plate typically have refractive index characteristics of nx > ny ≥ nz. The λ / 2 plate preferably has an in-plane retardation Re(550) of 180 nm to 320 nm, and the λ / 4 plate preferably has an in-plane retardation Re(550) of 100 nm to 200 nm. Also, for example, the protective film may be a laminate of a negative B plate (nx > ny > nz) and a positive C plate (nz > nx = ny). In this specification, "Re(λ)" is the in-plane retardation measured with light of wavelength λ nm at 23°C. For example, "Re(550)" is the in-plane retardation measured with light of wavelength 550 nm at 23°C. Re(λ) is obtained by the formula: Re(λ) = (nx - ny) × d, where d (nm) is the thickness of the layer (film). "Rth(λ)" is the retardation in the thickness direction measured with light of wavelength λ nm at 23°C. For example, "Rth(550)" is the retardation in the thickness direction measured with light of wavelength 550 nm at 23°C. Rth(λ) is obtained by the formula: Rth(λ) = (nx - nz) × d, where d (nm) is the thickness of the layer (film)."nx" is the refractive index in the direction where the in-plane refractive index is maximum (i.e., the slow axis direction), "ny" is the refractive index in the direction orthogonal to the slow axis in the plane (i.e., the fast axis direction), and "nz" is the refractive index in the thickness direction.

[0012] The adhesive layer 120 is mainly used for finally bonding the obtained optical laminate to a display cell. According to an embodiment of the present invention, even when the optical laminate including the adhesive layer is subjected to cutting, cracks (especially cracks after a heat cycle test) can be suppressed. The adhesive layer 120 can typically be composed of an acrylic adhesive (acrylic adhesive composition). The acrylic adhesive composition typically contains a (meth)acrylic polymer as a main component. The (meth)acrylic polymer can be contained in the adhesive composition at a ratio of, for example, 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more in the solid content of the adhesive composition. The (meth)acrylic polymer contains alkyl (meth)acrylate as a main component as monomer units. Here, (meth)acrylate refers to acrylate and / or methacrylate. Examples of the alkyl group of the alkyl (meth)acrylate include linear or branched alkyl groups having 1 to 18 carbon atoms. The average carbon number of the alkyl group is preferably 3 to 9. Examples of the monomers constituting the (meth)acrylic polymer include carboxyl group-containing monomers, hydroxyl group-containing monomers, amide group-containing monomers, aromatic ring-containing (meth)acrylates, etc. in addition to alkyl (meth)acrylates. The acrylic adhesive composition may preferably contain a silane coupling agent and / or a crosslinking agent. Examples of the silane coupling agent include epoxy group-containing silane coupling agents. Examples of the crosslinking agent include isocyanate-based crosslinking agents and peroxide-based crosslinking agents. The thickness of the adhesive layer can be, for example, 10 μm to 50 μm. Details of the adhesive layer or the acrylic adhesive composition are described, for example, in JP-A-2016-190996, and the description of the said publication is incorporated herein by reference.

[0013] In an embodiment of the present invention, the ratio RR / DR of the specular reflectance RR to the diffuse reflectance DR at the cut end face of the optical laminate is 0.15 or more, preferably 0.16 or more, more preferably 0.22 or more, and still more preferably 0.24 or more. The upper limit of the ratio RR / DR is, for example, 0.37, preferably 0.30. If the ratio RR / DR is within such a range, cracks (particularly cracks after a heat cycle test) in the cut optical laminate can be suppressed. In particular, cracks can be suppressed when the cut optical laminate is laminated with a cover glass.

[0014] The specular reflectance RR at the cut end face of the optical laminate is preferably 0.30% or more, more preferably 0.40% or more, and still more preferably 0.50% or more. The upper limit of the specular reflectance RR is, for example, 0.75%, preferably 0.65%. The diffuse reflectance DR at the cut end face of the optical laminate is preferably 2.40% to 5.00%, more preferably 2.50% to 3.50%.

[0015] The specular reflectance RR and the diffuse reflectance DR are obtained, for example, as follows, and the ratio RR / DR is calculated from the obtained RR and DR. A cut optical laminate is randomly selected, and the selected optical laminates are laminated to form a bundle having a thickness of about 15 mm. More specifically, the optical laminates are randomly selected from a plurality of different workpieces (the workpieces will be described later). With the measurement surfaces of the produced bundle flush, rubber bands are wound around the bundle at positions (two positions) at a predetermined distance from both ends in the measurement surface direction of the bundle to restrain the bundle. For the measurement surface of the restrained bundle, SCI (Specular Component Include) and SCE (Specular Component Exclude) are measured using a spectrophotometer (for example, "CM-2600d" manufactured by Konica Minolta Inc.), and the specular reflectance RR and the diffuse reflectance DR are obtained from the following formulas. Specular reflectance RR = SCI - SCE Diffuse reflectance DR = SCE

[0016] Hereinafter, RR / DR will be described in more detail. Fig. 2 is a photograph showing the state of transmitted light of the cut end face in a state where optical laminates in which RR / DR satisfies the above range are laminated to a predetermined thickness, and Fig. 3 is a photograph showing the state of transmitted light of the cut end face in a state where optical laminates in which RR / DR deviates from the above range are laminated to a predetermined thickness. As is clear from a comparison between Fig. 2 and Fig. 3, in the optical laminate in which RR / DR satisfies the above range, the contour of light is clear (so-called glare exists), while in the optical laminate in which RR / DR deviates from the above range, the contour of light is unclear (no glare). As a result of repeating trial and error regarding the problem of cracks in the machined (typically, end mill machined) optical laminate, the inventors have found that cracks are suppressed in the optical laminate having glare on the cut end face. In particular, it has been found that such a laminate suppresses cracks when laminated with a cover glass. Thus, the present invention solves a newly arisen problem in the cutting process (typically, end mill process) of an optical laminate, and the effect by optimizing the glare (or RR / DR) of the cut end face is an unexpectedly excellent effect. Although the state of transmitted light is shown in Figs. 2 and 3 to clarify the difference, the glare of reflected light also corresponds thereto.

[0017] Hereinafter, as an example, each step in the manufacturing method of an optical laminate having a planar shape as shown in Fig. 4 will be described.

[0018] B. Formation of workpiece FIG. 4 is a schematic perspective view for explaining cutting, and a workpiece 1 is shown in this figure. As shown in FIG. 4, a workpiece 1 formed by stacking a plurality of optical laminates is formed. The optical laminate is typically cut into any appropriate shape when forming the workpiece. Specifically, the optical laminate may be cut into a rectangular shape, a shape similar to a rectangular shape, or an appropriate shape according to the purpose (for example, circular). In the illustrated example, the optical laminate is cut into a rectangular shape, and the workpiece 1 has outer peripheral surfaces (cutting surfaces) 1a, 1b facing each other and outer peripheral surfaces (cutting surfaces) 1c, 1d orthogonal to them. The workpiece 1 is preferably clamped from above and below by clamping means (not shown). The total thickness of the workpiece is preferably 8 mm to 20 mm, more preferably 9 mm to 15 mm, and even more preferably about 10 mm. With such a thickness, damage due to pressing by the clamping means or impact during cutting can be prevented. The optical laminates are stacked so that the workpiece has such a total thickness. The number of optical laminates constituting the workpiece can be, for example, 10 to 50. The clamping means (for example, a jig) may be made of a soft material or a hard material. When made of a soft material, its hardness (JIS A) is preferably 60° to 80°. If the hardness is too high, pressing marks may remain due to the clamping means. If the hardness is too low, displacement may occur due to deformation of the jig, resulting in insufficient cutting accuracy.

[0019] C. Cutting Next, the outer peripheral surface of the workpiece 1 is cut by the cutting means 20. The cutting is performed by bringing the cutting edge of the cutting means into contact with the outer peripheral surface of the workpiece 1. The cutting may be performed over the entire circumference of the outer peripheral surface of the workpiece or only at a predetermined position. When producing an optical laminate having a planar shape as shown in FIG. 4, the cutting is typically performed over the entire circumference of the outer peripheral surface of the workpiece. The cutting process is typically so-called end mill machining as shown in FIGS. 5 to 7. That is, the side surface of the cutting means (end mill) 20 is used to cut the outer peripheral surface of the workpiece 1. As the cutting means (end mill) 20, a straight end mill can typically be used.

[0020] As shown in FIGS. 6 and 7, the end mill 20 has a rotation axis 21 extending in the lamination direction (vertical direction) of the workpiece 1, and a cutting edge 22 configured as the outermost diameter of the main body that rotates about the rotation axis 21. The cutting edge 22 may be configured as an outermost diameter twisted along the rotation axis 21 as shown in FIG. 6 (it may have a predetermined twist angle), or may be configured to extend in a direction substantially parallel to the rotation axis 21 as shown in FIG. 7 (the twist angle may be 0°). Note that "0°" means substantially 0°, and also includes cases where there is a slight angular twist due to machining errors or the like. When the cutting edge has a predetermined twist angle, the twist angle is preferably 70° or less, more preferably 65° or less, and even more preferably 45° or less. The cutting edge 22 includes a cutting edge tip 22a, a rake face 22b, and a relief face 22c. The number of cutting edges of the cutting edge 22 can be appropriately set as long as the desired number of contacts described later can be obtained. The number of cutting edges in FIG. 6 is three, and the number of cutting edges in FIG. 7 is two, but the number of cutting edges may be one, four, five or more. Preferably, the number of cutting edges is two. With such a configuration, the rigidity of the cutting edge is ensured, and a pocket is ensured to discharge the chips well.

[0021] In one embodiment, the HV hardness of the cutting edge 22 is typically 1500 or more, preferably 1700 or more, and more preferably 2000 or more. The upper limit of the HV hardness can be, for example, 2350. In this case, the cutting edge is typically composed of cemented carbide. Cemented carbide is typically obtained by sintering metal carbide powders. Specific examples of cemented carbide include WC-Co alloys, WC-TiC-Co alloys, WC-TaC-Co alloys, and WC-TiC-TaC-Co alloys. Note that the HV hardness is also referred to as Vickers hardness and can be measured according to JIS Z 2244.

[0022] In another embodiment, the HV hardness of the cutting edge 22 is typically 7000 or more, preferably 8000 or more, more preferably 9000 or more, and even more preferably 10000 or more. The upper limit of the HV hardness can be, for example, 15000. In this case, the cutting edge typically includes sintered diamond. More specifically, the cutting edge has a sintered diamond layer formed on a base made of cemented carbide. Sintered diamond (PCD: Polycrystalline diamond) refers to polycrystalline diamond obtained by sintering small diamond grains together with metal and / or ceramic powder at high temperature and high pressure.

[0023] The cutting conditions can be appropriately set according to the purpose. For example, by appropriately adjusting the feed rate, rotational speed, number of blades, etc. of the end mill, a machined optical laminate having a predetermined RR / DR can be obtained. In this specification, "feed rate" means the relative speed between the cutting means (end mill) and the workpiece. Therefore, in cutting, only the end mill may be moved, only the workpiece may be moved, or both the end mill and the workpiece may be moved. The number of cuts can be one cut, two cuts, three cuts, or more. In one embodiment, the diameter of the end mill 20 is preferably 3 mm to 20 mm.

[0024] As described above, a machined optical laminate having a predetermined RR / DR can be obtained. Note that the machined optical laminate (substantially an optical film and an adhesive layer) may typically have cutting marks.

[0025] D. Optical laminate with cover glass According to an embodiment of the present invention, the optical laminate (for example, the optical laminate described in the above items A to C) can be preferably laminated with the cover glass as described above. Therefore, the optical laminate with a cover glass is also included in the embodiments of the present invention. FIG. 8 is a schematic cross-sectional view for explaining an optical laminate with a cover glass according to one embodiment of the present invention. The optical laminate with a cover glass 101 in the illustrated example has a polarizer 110, an adhesive layer 120, and a cover glass 150 laminated via another adhesive layer 140 disposed on the side opposite to the adhesive layer 120 of the polarizer 110. A separator 130 is removably temporarily attached to the surface of the adhesive layer 120. That is, the optical laminate with a cover glass 101 has the optical laminate of FIG. 1 and a cover glass 150 laminated via another adhesive layer 140 disposed on the side opposite to the adhesive layer 120 of the optical laminate.

[0026] The adhesive (adhesive composition) constituting the other adhesive layer 140 preferably has a storage elastic modulus at -40°C of 1.0×10 8 (Pa) or more. By adopting such an adhesive layer, even when a cover glass is bonded to the machined optical laminate, cracks (especially cracks after a heat cycle test) can be suppressed due to a synergistic effect with the effect of optimizing RR / DR of the cut end face of the optical laminate. Examples of such an adhesive (adhesive composition) include rubber-based adhesives. The rubber-based adhesive may typically contain a butadiene polymer and / or a polyisoprene polymer (or a modified product thereof) and a photopolymerization initiator. The rubber-based adhesive may further contain polyurethane acrylate, polyisoprene-based acrylate or its esterified product, terpene-based hydrogenated resin, dicyclopentenyl oxyethyl methacrylate, 2-hydroxybutyl methacrylate, and the like.

[0027] Since a configuration well-known in the industry can be adopted for the cover glass 150, a detailed description thereof is omitted.

[0028] The optical laminate with a cover glass can be obtained by bonding a cover glass to a cut optical laminate (for example, the optical laminate described in Items A to C above) via the other adhesive layer 140.

[0029] E. Image display device with a cover glass As described above, the optical laminate according to the embodiment of the present invention (for example, the optical laminate described in Items A to C above) can be suitably applied to an image display device with a cover glass. Therefore, an image display device with a cover glass is also included in the embodiment of the present invention. The image display device with a cover glass includes a display cell, the optical laminate according to the embodiment of the present invention disposed on the viewing side of the display cell, and a cover glass disposed on the viewing side of the optical laminate.

[0030] The optical laminate with a cover glass according to the embodiment of the present invention (for example, the optical laminate with a cover glass described in Item D above) can also be applied to an image display device to constitute an image display device with a cover glass. In this case, the image display device with a cover glass includes a display cell and the optical laminate with a cover glass according to the embodiment of the present invention disposed on the viewing side of the display cell.

[0031] Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.

Examples

[0032] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. The evaluation items in the examples are as follows.

[0033] (1) RR / DR A plurality of different polarizing plates were randomly selected from the workpieces obtained in the examples and comparative examples, and the selected polarizing plates were laminated to produce a bundle with a thickness of about 15 mm. With the measurement surface of the produced bundle being flush, rubber rings (#7, manufactured by I.G.O.) were wound around the bundle at two positions 10 mm from both ends in the direction of the measurement surface of the bundle to restrain the bundle. Regarding the measurement surface of the restrained bundle, SCI and SCE were measured using a spectrophotometer ("CM-2600d" manufactured by Konica Minolta), and the specular reflectance RR and the diffuse reflectance DR were obtained from the following formulas. Specular reflectance RR = SCI - SCE Diffuse reflectance DR = SCE (2) Crack Glass plates were bonded to both sides of the polarizing plates obtained in the examples and comparative examples, and a heat cycle (heat shock) test of 200 cycles was performed at -40°C to 85°C. Regarding the occurrence status of cracks after the test, a transmission light inspection was performed with the polarizing filter arranged so as to be crossed with the absorption axis of the polarizer of the above polarizing plate, and the evaluation was carried out according to the following criteria. Present: Light leakage can be visually recognized Absent: Light leakage cannot be visually recognized

[0034] <Example 1> In the conventional method, a polarizing plate with an adhesive layer having a structure of a surface protection film (48 μm) / hard coat layer (5 μm) / cyclic olefin-based protection film (47 μm) / polarizer (5 μm) / cyclic olefin-based protection film (24 μm) / adhesive layer (20 μm) / separator was produced in order from the viewing side. The adhesive layer was produced according to

[0121] and

[0124] of JP-A-2016-190996. The obtained polarizing plate with an adhesive layer was punched into a shape similar to that in FIG. 4 (approximate size 142.0 mm × 66.8 mm with R6.25 mm at the four corners), and a plurality of the punched polarizing plates with an adhesive layer were stacked to form a workpiece (total thickness of about 10 mm). With the obtained workpiece clamped by a clamp (jig), the peripheral portion was cut by end mill machining to obtain a cut polarizing plate with an adhesive layer as shown in FIG. 4. The cutting edge of the end mill used sintered diamond and had an HV hardness of 10,000. Also, the number of teeth of the end mill was 2, and the helix angle was 0°. Further, the feed rate of the end mill (feed rate when cutting the straight portion) was 1000 mm / min, the rotational speed was 25,000 rpm, and the number of cutting passes was 2 (cutting depths of 0.1 mm for the first pass and 0.2 mm for the second pass, total cutting depth of 0.3 mm). The RR / DR of the obtained cut polarizing plate with an adhesive layer was 0.17.

[0035] The surface protection film of the above polarizing plate with an adhesive layer was peeled off, and another adhesive layer was formed on the peeled surface. Another adhesive layer was produced according to

[0053] of JP-A-2016-103030. Further, the separator temporarily attached to the adhesive layer on the cyclic olefin-based protection film side was peeled off, and glass plates were bonded to both sides of the polarizing plate having adhesive layers on both sides thus obtained, and the above crack evaluation was performed. The results are shown in Table 1.

[0036] <Examples 2 and Comparative Examples 1 to 2> A cut polarizing plate with an adhesive layer as shown in FIG. 4 was obtained in the same manner as in Example 1 except that the cutting conditions were changed as shown in Table 1. The RR / DR of the obtained cut polarizing plate with an adhesive layer was as shown in Table 1. Further, crack evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

[0037]

Table 1

Industrial Applicability

[0038] The machined optical laminate of the present invention is suitably used when laminating a cover glass on an image display portion, and in particular, can be suitably used for a rectangular image display portion typified by a personal computer (PC) or a tablet terminal, and / or an irregularly shaped image display portion typified by an automobile instrument panel or a smart watch.

Explanation of Signs

[0039] 1 Workpiece 20 Cutting means 100 Optical laminate 101 Optical laminate with cover glass 110 Optical film 120 Adhesive layer 140 Another adhesive layer 150 Cover glass

Claims

1. An optical laminate having a machined optical film and an adhesive layer, wherein the cut end face has cut marks extending along a direction orthogonal to the thickness direction of the optical film, and the ratio RR / DR of the specular reflectance RR to the diffuse reflectance DR at the cut end face is 0.15 or more.

2. The optical laminate according to Claim 1, wherein the optical film contains a polarizer.

3. The optical laminate according to Claim 2, wherein the optical film further has a protective film on the side opposite to the adhesive layer of the polarizer.

4. The optical laminate according to Claim 2 or 3, wherein the optical film further has another protective film between the polarizer and the adhesive layer.

5. The optical laminate according to Claim 4, wherein the another protective film also serves as a retardation layer.

6. The optical laminate according to any one of Claims 1 to 5, having a shape other than rectangular.

7. An optical laminate with a cover glass, comprising the optical laminate according to any one of Claims 1 to 6, and a cover glass laminated via another adhesive layer disposed on the side opposite to the adhesive layer of the optical laminate.

8. An image display device with a cover glass, comprising a display cell, the optical laminate according to any one of Claims 1 to 6 disposed on the viewing side of the display cell, and a cover glass disposed on the viewing side of the optical laminate.

9. An image display device with a cover glass, comprising a display cell and the optical laminate with a cover glass according to Claim 7 disposed on the viewing side of the display cell.

Images