JP2019188795A - Optical laminate and method for producing the same - Google Patents

Abstract

To provide an optical laminate including a colored layer and having resistance to bending.SOLUTION: An optical laminate has a front plate 10, a bonding layer 20 and a rear plate 30 in the stated order. The optical laminate further has a colored layer 40 provided on part of the surface of the bonding layer 20 side of the rear plate 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical laminate and a method for producing the same, and further relates to an image display device and a polarizing plate with a colored layer.

  As various image display devices such as a liquid crystal display device and an organic electroluminescence display device, a configuration is known in which a front plate is provided on the viewing side of the display panel for the purpose of protecting the display panel. When the display panel is a touch panel, the front plate can also function as a touch surface.

  Japanese Patent Laying-Open No. 2014-238533 (Patent Document 1) describes that a front plate is provided on the viewing side of the display panel of the image display device, and the peripheral portion of the surface of the front panel on the display panel side is colored. It is described that a printing layer is provided as a layer. The colored layer also functions as a shielding layer that forms a non-display area of the image display device.

JP 2014-238533 A

  In recent years, expectations for flexible image display devices have increased. The flexible image display device can be installed on a non-planar surface or a folding surface, and can be folded when being carried or formed into a scroll shape to improve portability.

  In order to construct a flexible image display device, each component is required to have durability against bending. About a colored layer, there existed a problem that the durability with respect to a bending was not enough because a crack and discoloration may arise by repeating a bending.

  The present invention includes an optical laminate having a colored layer and having durability against bending, an image display device having the optical laminate, a polarizing plate with a colored layer provided with the colored layer, and the production of the optical laminate. It aims to provide a method.

  The present invention provides the following optical laminate, image display device, polarizing plate with a colored layer, and a method for producing the optical laminate.

[1] An optical laminate comprising a front plate, a bonding layer, and a back plate in this order,
The optical laminated body further provided with the colored layer provided in a part on the surface at the side of the said bonding layer of the said backplate.
[2] The optical layered body according to [1], wherein the colored layer has a thickness of 3 μm or more.
[3] The optical laminate according to [1] or [2], wherein the front plate is a resin film.
[4] The optical laminate according to any one of [1] to [3], wherein the back plate has a polarizing plate.
[5] An image display device comprising the optical laminate according to any one of [1] to [4], wherein the front plate is disposed on the front surface.
[6] Polarizing plate,
A colored layer-attached polarizing plate, comprising: a colored layer provided on a part of the surface on the viewing side of the polarizing plate.
[7] A production method for producing the optical laminate according to any one of [1] to [4],
A colored layer forming step of forming the colored layer on a part of the outermost surface layer on the bonding layer side of the back plate;
A laminating step of laminating the bonding layer on the outermost surface layer after the colored layer forming step.
[8] An optical laminate comprising a front plate, a bonding layer, and a back plate in this order,
Further comprising a colored layer provided on a part of the surface on the bonding layer side of the back plate,
The colored layer includes a plated layer.
[9] The optical laminate according to [8], wherein the colored layer further includes a protective layer that covers the plating layer.
[10] The optical layered body according to [8] or [9], wherein the colored layer further includes an underlayer coated with the plating layer.
[11] The optical layered body according to [10], wherein the underlayer includes a black pigment.
[12] The optical layered body according to any one of [8] to [11], wherein the colored layer has a thickness of 1 μm to 30 μm.
[13] The optical layered body is distinguished into a display area and a non-display area in a plane direction orthogonal to the stacking direction,
The colored layer is provided in the non-display area,
The optical laminate according to any one of [8] to [12], wherein the non-display area has an optical density of 3 or more.
[14] The optical laminate according to any one of [8] to [13], wherein the front plate is a resin film.
[15] The optical laminate according to any one of [8] to [14], wherein the back plate has a polarizing plate.
[16] An image display device comprising the optical laminate according to any one of [8] to [15], wherein the front plate is disposed on the front surface.
[17] A polarizing plate;
A colored layer provided on a part of the viewing side surface of the polarizing plate,
The colored layer is a polarizing plate with a colored layer having a plating layer.
[18] A method for producing the optical layered body according to any one of [8] to [15],
A colored layer forming step of forming the colored layer on a part of the outermost surface layer on the bonding layer side of the back plate;
A laminating step of laminating the bonding layer on the outermost surface layer after the colored layer forming step.

  According to the present invention, an optical laminate having a colored layer and having durability against bending, an image display device having the optical laminate, a polarizing plate with a colored layer provided with the colored layer, and the optical laminate A manufacturing method can be provided.

It is a schematic sectional drawing of the optical laminated body by one Embodiment of this invention. It is a schematic sectional drawing of the image display apparatus by one Embodiment of this invention. It is the top view which looked at the optical laminated body from the front plate side. It is a figure which shows the example of a bending aspect in case an image display apparatus is a flexible display. It is a schematic sectional drawing of the image display apparatus by 1st Embodiment of this invention. It is a schematic sectional drawing of the image display apparatus by 2nd Embodiment of this invention. It is a schematic sectional drawing of the image display apparatus by 3rd Embodiment of this invention. It is a schematic sectional drawing of the image display apparatus by 4th Embodiment of this invention. It is sectional drawing which shows typically an example of the manufacturing method of the optical laminated body of this invention. It is a figure which shows typically the test method which evaluates a flexibility. 3 is a cross-sectional view schematically showing a method for manufacturing the optical layered body in Example 1. FIG. 10 is a cross-sectional view schematically showing a method for manufacturing the optical layered body in Comparative Example 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the following drawings, the scale is appropriately adjusted for easy understanding of each component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.

[Optical laminate]
FIG. 1 is a schematic cross-sectional view of an optical laminate according to an embodiment of the present invention. The optical laminated body 100 of this embodiment is provided with the front board 10, the bonding layer 20, and the back board 30 in an order from the visual recognition side. The optical layered body 100 includes a colored layer 40, and the colored layer 40 is provided on a part of the surface of the back plate 30 on the bonding layer 20 side. The optical laminated body 100 may be distinguished into the display area A and the non-display area B in the plane direction orthogonal to the lamination direction. In this case, it is preferable that the non-display area B includes the colored layer 40. In the following, the case where the optical laminate 100 is distinguished into the display area A and the non-display area B and the non-display area B includes the colored layer 40 will be described as an example.

[Image display device]
FIG. 2 is a schematic cross-sectional view of an image display device according to an embodiment of the present invention. The image display apparatus 300 according to the present embodiment includes an optical laminate 100 including a front plate 10 disposed on the front surface, and a display laminate 200 including a display unit.

  FIG. 3 is a top view of the image display device 300 as viewed from the front plate 10 side. The non-display area B has an optical density of preferably 3 or more, and more preferably 3.2 or more. When the optical density of the non-display area B is within the above numerical range, elements such as wirings arranged in the non-display area B are sufficiently shielded and the visibility of the image in the display area A is improved. The colored layer 40 contributes to the improvement of the optical density of the non-display area B. Moreover, since the shape and color of the colored layer 40 are visually recognized through the bonding layer 20 and the front plate 10, the colored layer 40 also contributes to the design of the image display device 300. The colored layer 40 of the present invention may contain a metal, and when the metal is contained, the reflected light from the metal is visually recognized as the color of the colored layer 40, which contributes to a design having a high-class feeling.

  The shape and size in the surface direction of the optical laminate 100 correspond to the shape and size in the surface direction of the image display device 300 in which the optical laminate 100 is used. The shape of the image display device 300 in the surface direction is preferably a square shape, more preferably a square shape having a long side and a short side. This square shape is preferably rectangular. When the shape in the surface direction of the image display device 300 is a rectangle, the length of the long side is, for example, 50 mm to 300 mm, and preferably 100 mm to 280 mm. The length of the short side is, for example, 30 mm to 250 mm, and preferably 60 mm to 220 mm. When the optical laminated body 100 has a rectangular shape, at least one kind of processing including R processing, notch processing, and drilling processing may be performed.

  The thickness of the optical laminated body 100 is preferably designed as appropriate depending on the functions of the front plate 10 and the back plate 30 and is not particularly limited, but is, for example, 40 μm to 300 μm, and preferably 70 μm to 200 μm.

  The optical laminated body 100 is preferably bendable. Being bendable means that good results can be obtained in a bending test with a bending curvature of 2.5R. In the optical laminated body according to a preferred embodiment of the present invention, good results are obtained in a bending test with a bending curvature of 2.5R. The bending test with a bending curvature of 2.5R is performed according to the method described in Examples described later.

  The image display device 300 can be configured as a flexible display panel. FIG. 4 shows an example of a bending mode when the image display device is a flexible display panel. FIG. 4A shows a flexible display 305 configured to be foldable with the viewing-side surface inside, and FIG. 4B shows a flexible display 306 that can be wound.

  When the image display device 300 is a flexible display, cracks and discoloration may be caused by repeatedly applying a bending force to the colored layer 40 or by continuously applying a bending force. is there. In the image display apparatus 300, if a crack or discoloration occurs in the colored layer 40, it is not preferable because it is easily recognized. In addition, regardless of whether or not the image display device 300 is a flexible display, when the optical laminate 100 has flexibility, a bending force is also applied when the optical laminate 100 is transported. In some cases, the colored layer 40 may cause cracks or discoloration.

  In the optical layered body 100 and the image display device 300 of the present invention, the bending force is repeatedly or continuously applied by placing the colored layer 40 on the surface of the back plate 30 on the bonding layer 20 side. However, the generation of cracks and discoloration in the colored layer 40 can be suppressed. The optical layered body 100 and the image display device 300 according to the present invention are capable of cracking the colored layer 40 with respect to the bending force with the front plate 10 inward and the bending force with the front plate 10 outward. The occurrence of discoloration can be prevented. Compared with the case where the colored layer 40 is disposed on the surface of the front plate 10, the lamination position of the colored layer 40 can be brought closer to the center in the lamination direction of the optical laminate 100. For this reason, it is thought that the stress which arises in the colored layer 40 resulting from bending becomes small, and the said effect is show | played.

  Based on such a viewpoint, the distance d1 (shown in FIG. 1) from the surface of the colored layer 40 closer to the front plate 10 to the outermost surface of the optical laminate 100 on the front plate 10 side, and the colored layer 40 The magnitude of the difference from the distance d2 (shown in FIG. 1) from the surface far from the front plate 10 to the outermost surface on the back plate 30 side in the optical laminate 100 may be 0 μm or more and 50 μm or less. It is preferable that it is 30 micrometers or less.

The relative magnitude D (%) of the difference between the distance d1 and the distance d2 is preferably 25% or less, more preferably 20% or less, and even more preferably 15% or less. The lower limit is not particularly limited, and may be 0%. The relative magnitude D (%) of the difference is given by the following formula:
D = 100 × | (d1−d2) / (d1 + d2) |
Is calculated from

  The image display device 300 can be configured as a touch panel image display device. The touch panel image display device includes a touch sensor panel, and the front plate 10 included in the optical laminate 100 forms a touch surface.

  Hereinafter, the image display apparatus according to the present invention will be described in detail with reference to specific forms (first to fourth embodiments) and the respective components.

<First Embodiment>
FIG. 5 is a schematic cross-sectional view of the image display device according to the first embodiment of the present invention. The image display device of this embodiment is a touch panel type liquid crystal display device. The liquid crystal display device 301 includes a front plate 10, a bonding layer 20, a polarizing plate 60a, a touch sensor panel 70, a liquid crystal display element unit 81, a polarizing plate 60b, and a backlight unit 90 in order from the viewing side. The liquid crystal display device 301 includes a colored layer 40 provided on a part of the surface of the polarizing plate 60a on the bonding layer 20 side. The liquid crystal display device 301 may be distinguished into a display area A and a non-display area B in the surface direction. In this case, it is preferable that the non-display area B includes the colored layer 40.

  In the liquid crystal display device 301, a laminate including the front plate 10, the bonding layer 20, and the polarizing plate 60 a and including the colored layer 40 is configured as the optical laminate 101, and the optical laminate 101 is used. A liquid crystal display device 301 is configured. In the present embodiment, the polarizing plate 60 a also functions as the back plate 30 of the optical laminate 101.

Second Embodiment
FIG. 6 is a schematic cross-sectional view of an image display apparatus according to the second embodiment of the present invention. The image display device of this embodiment is a touch panel type liquid crystal display device. The liquid crystal display device 302 is different from the liquid crystal display device 301 shown in FIG. 5 in that the laminated position of the polarizing plate 60a and the touch sensor panel 70 is switched, and the colored layer 40 is the surface of the touch sensor panel 70 on the bonding layer 20 side. Only the points provided above differ.

  In the liquid crystal display device 302, a laminate including the front plate 10, the bonding layer 20, and the touch sensor panel 70 and including the colored layer 40 is configured as the optical laminate 102, and the optical laminate 102 is used. Thus, the liquid crystal display device 302 is configured. In the present embodiment, the touch sensor panel 70 also functions as the back plate 30 of the optical laminate 102.

<Third Embodiment>
FIG. 7 is a schematic cross-sectional view of an image display device according to a third embodiment of the present invention. The image display device of this embodiment is a touch panel type organic electroluminescence (EL) display device. The organic EL display device 303 includes a front plate 10, a bonding layer 20, a polarizing plate 60c, a touch sensor panel 70, and an organic EL unit 82 in order from the viewing side. The organic EL display device 303 includes a colored layer 40 provided on a part of the surface of the polarizing plate 60c on the bonding layer 20 side. The organic EL display device 303 may be divided into a display area A and a non-display area B in the plane direction. In this case, it is preferable that the non-display area B includes the colored layer 40.

  In the organic EL display device 303, a laminate including the front plate 10, the bonding layer 20, and the polarizing plate 60 c and including the colored layer 40 is configured as the optical laminate 103, and the optical laminate 103 is used. Thus, the organic EL display device 303 is configured. In the present embodiment, the polarizing plate 60 c also functions as the back plate 30 of the optical laminate 103.

<Fourth embodiment>
FIG. 8 is a schematic cross-sectional view of an image display device according to a fourth embodiment of the present invention. The image display device of the present embodiment is a touch panel type organic EL display device. The organic EL display device 304 is different from the organic EL display device 303 shown in FIG. 7 in that the lamination position of the polarizing plate 60c and the touch sensor panel 70 is switched, and the colored layer 40 is on the bonding layer 20 side of the touch sensor panel 70. The only difference is that it is provided on the surface.

  In the organic EL display device 304, a laminate including the front plate 10, the bonding layer 20, and the touch sensor panel 70 and including the colored layer 40 is configured as the optical laminate 104. The organic EL display device 304 is configured by using this. In the present embodiment, the touch sensor panel 70 also functions as the back plate 30 of the optical laminate 104.

(Display unit)
Examples of the display unit included in the image display device 300 include a display unit including a display element such as a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, and a field emission display element.

  The image display device 300 can be used as a flexible display. In this case, since the display element can be flexible, the display element is preferably a liquid crystal display element, an organic EL display element, or an inorganic EL display element.

(Front plate)
As long as the front plate 10 is a plate that can transmit light, the material and thickness thereof are not limited, and may be a single layer or multiple layers. (For example, a glass plate, a glass film, etc.) and resin-made plate-like bodies (for example, a resin plate, a resin sheet, a resin film, etc.) are illustrated.

  As the glass plate, tempered glass for display is preferably used. The thickness of the glass plate is, for example, 50 μm to 1000 μm. By using the glass plate, the front plate 10 having excellent mechanical strength and surface hardness can be configured.

  The resin film is not limited as long as it is a resin film that can transmit light. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, polyacryl, polyimide, polyethersulfone, polysulfone , Polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene Films made of polymers such as phthalate, polycarbonate, polyamideimide And the like. These polymers can be used alone or in admixture of two or more. When the image display device 300 is a flexible display, it is formed of a polymer such as polyimide, polyamide, and polyamideimide that has excellent flexibility and can be configured to have high strength and high transparency. A resin film is preferably used.

  The resin film may be a film in which a hard coat layer is provided on at least one surface of the base film to further improve the hardness. The hard coat layer may be formed on one surface of the base film, or may be formed on both surfaces. When the image display device 300 is a touch panel image display device, the surface of the front plate 10 is a touch surface, and therefore a resin film having a hard coat layer is preferably used. By providing the hard coat layer, a resin film having improved hardness and scratch properties can be obtained. The hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coat layer may contain an additive in order to improve the strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, or a mixture thereof. The thickness of the resin film is, for example, 30 μm to 2000 μm.

  The front plate 10 may have not only a function of protecting the front surface of the image display device 300 but also a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like.

  The thickness of the front plate 10 can be 10 to 500 μm, and preferably 20 to 100 μm. When the front plate has a hard coat layer, the thickness of the front plate includes the thickness of the hard coat layer.

(Lamination layer)
The bonding layer 20 is a layer that is interposed between the front plate 10 and the back plate 30 to bond them, and is a pressure-sensitive adhesive layer or an adhesive layer. The bonding layer 20 is preferably a pressure-sensitive adhesive layer from the viewpoint of satisfactorily absorbing the steps of the colored layer 40.

  The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition mainly composed of a resin such as (meth) acrylic, rubber-based, urethane-based, ester-based, silicone-based, or polyvinyl ether-based. Especially, the adhesive composition which uses (meth) acrylic resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is suitable. The pressure-sensitive adhesive composition may be an active energy ray curable type or a thermosetting type.

  Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and (meth) acrylic acid 2- A polymer or copolymer having one or more (meth) acrylic acid esters such as ethylhexyl as a monomer is preferably used. The base polymer is preferably copolymerized with a polar monomer. Examples of polar monomers include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, glycidyl ( Mention may be made of monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as (meth) acrylate.

  The pressure-sensitive adhesive composition may contain only the above base polymer, but usually further contains a crosslinking agent. As a crosslinking agent, a metal ion having a valence of 2 or more, which forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound, which forms an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form ester bonds with carboxyl groups; polyisocyanate compounds that form amide bonds with carboxyl groups. Of these, polyisocyanate compounds are preferred.

  The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays and electron beams, and has an adhesive property even before irradiation with active energy rays. It is a pressure-sensitive adhesive composition having such a property that it can be adhered to an adherend such as the like and can be cured by irradiation with active energy rays to adjust the adhesion. The active energy ray-curable pressure-sensitive adhesive composition is preferably ultraviolet curable. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer and the like may be contained.

  Adhesive composition consists of fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powder and other inorganic powders) Etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, corrosion inhibitors, photopolymerization initiators and the like.

  It can form by apply | coating the organic solvent dilution liquid of the said adhesive composition on a base material, and making it dry. When the active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be obtained by irradiating the formed pressure-sensitive adhesive layer with active energy rays.

  The thickness of the bonding layer 20 is preferably thicker than the thickness of the colored layer 40 from the viewpoint of absorbing the level difference of the colored layer 40, for example, preferably 3 μm to 100 μm, and more preferably 5 μm to 50 μm.

(Back plate)
The back plate 30 is not limited in material and thickness as long as it is a plate-like body that can transmit light, and may be a single layer or multiple layers. The thickness of the back plate can be 10 μm to 1000 μm, preferably 20 to 500 μm, and more preferably 50 to 100 μm. The display unit may not be included in the back plate.

  As described above, components used in a normal image display device such as the polarizing plates 60a and 60c and the touch sensor panel 70 can be used as the back plate 30. Using such components as the back plate 30 is preferable because the number of components of the image display device 300 can be reduced and the image display device 300 can be made thinner.

  In the above, the case where the back plate 30 is also the polarizing plates 60a and 60c and the touch sensor panel 70 is illustrated, but the back plate 30 is not limited to these and is a protective film on the viewing side of the polarizing plate. Or a laminate of a polarizing plate and a touch sensor panel.

  As the back plate 30, similarly to the front plate 10, a glass plate (for example, a glass plate, a glass film, etc.) or a resin plate (for example, a resin plate, a resin sheet, a resin film, etc.) is used. It can also be used. As specific examples of the glass plate body and the resin plate body, the above description regarding the front plate 10 is applied.

(Colored layer)
The shape and color of the colored layer 40 are not limited and can be appropriately selected depending on the application and design. Examples of the colored layer 40 include layers colored in colors such as black, red, white, amber, silver, and gold. The colored layer 40 may be formed from a single layer or a plurality of layers. When the colored layer 40 is formed from a plurality of layers, the color of the colored layer 40 may be a single color or a plurality of colors. The colored layer 40 may contain a metal, and such a metal may be contained in the plating layer.

  The colored layer 40 can be formed by a printing method using ink or paint, or a method of forming the colored layer 40 containing a metal pigment in advance and bonding it. Moreover, you may combine these methods. The colored layer 40 is preferably formed on the surface of the back plate 30. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by a printing method may be repeatedly performed to obtain a colored layer 40 having a desired thickness. The ink or paint used for forming the colored layer 40 includes, for example, a binder, a colorant, a solvent, and optional additives.

  Examples of the binder include chlorinated polyolefin (for example, chlorinated polyethylene, chlorinated polypropylene), polyester resin, urethane resin, acrylic resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and cellulose resin. . Binder resin may be used independently and may use 2 or more types together. The binder resin may be a heat polymerizable resin or a photopolymerizable resin.

  The colorant can be appropriately selected according to the desired coloration. Examples of the colorant include inorganic pigments such as titanium white, zinc white, carbon black, iron black, petal, chrome vermilion, ultramarine, cobalt blue, yellow lead, and titanium yellow; phthalocyanine blue, indanthrene blue, and isoindo Organic pigments or dyes such as linone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, aniline black; metal pigments composed of scaly foils such as aluminum and brass; scaly forms such as titanium dioxide-coated mica and basic lead carbonate Examples include pearlescent pigments (pearl pigments) made of foil pieces. The colorant is preferably contained in an amount of 50 to 200 parts by mass with respect to 100 parts by mass of the binder resin.

  The thickness of the colored layer 40 is preferably 1 μm to 50 μm, more preferably 3 μm to 30 μm, and may be 3 μm to 20 μm from the viewpoint of improving the shielding effect while suppressing a visible step. . When the colored layer 40 is black, a high shielding effect can be obtained as compared with other colors even if the thickness is small. FIG. 1 illustrates the case where the thickness of the colored layer 40 is uniform and the cross-sectional shape is rectangular, but the thickness of the colored layer 40 may not be uniform, for example, the thickness decreases toward the inside. The cross-sectional shape may have a tapered portion. By having the tapered portion, it is possible to suppress air entrainment that is likely to occur during lamination. When the thickness of the colored layer 40 is not uniform, the numerical range described above as the thickness of the colored layer 40 is the maximum thickness of the colored layer 40. The colored layer 40 preferably has an appropriate elastic force from the viewpoint of suppressing a visible step. The elastic force of the colored layer 40 can be adjusted by the type of binder used, the blending ratio, and the like.

  When the colored layer 40 is provided on the peripheral edge of the back plate 30, it is not limited to the form provided on the entire periphery of the peripheral part, and is provided on only a part of the peripheral part according to a desired design or the like. Also good. When providing the colored layer 40 in the peripheral part of the backplate 30, the width | variety can be suitably determined according to the magnitude | size of a display area, a desired design, etc., for example, it is preferable that it is the range of 1-20 mm. .

  If the colored layer 40 is provided in a part on the surface at the side of the bonding layer 20 of the back plate 30, the arrangement position in the surface direction is not limited. In the case of a configuration in which the colored layer 40 is arranged at the peripheral edge as in the image display device 300 shown in FIGS. 2 and 3, light leakage from the peripheral edge can be suppressed and it is visually recognized like a frame. Design can be improved.

  When the colored layer 40 contains a metal, the metal is preferably contained as a plating layer. As an aspect in which the colored layer 40 includes a metal, an aspect in which a metal pigment is included in the printing layer or the coating layer is also possible. It was found that the layer was more durable against bending. Therefore, when the colored layer 40 includes a metal, the structure including the metal as a plating layer contributes to an improvement in durability against bending.

  When the colored layer 40 includes a plating layer, the thickness of the colored layer 40 is preferably 30 μm or less, and more preferably 15 μm or less. When the thickness of the colored layer 40 is within the above numerical range, durability against bending can be improved. The thickness of the colored layer 40 is preferably 3 μm or more, and more preferably 6 μm or more. When the thickness of the colored layer 40 is 3 μm or more, the colored layer 40a is easily visually recognized, which contributes to an improvement in design and contributes to an improvement in the optical density of the non-display area B.

  The optical layered body 100 may include a shielding layer on the surface opposite to the surface on the bonding layer 20 side of the back plate 30, separately from the colored layer 40. The shielding layer can be provided in the non-display area B of the optical laminate 100 and is preferably provided on the colored layer 40 via the back plate 30. The shielding layer contributes to the improvement of the optical density of the non-display area B. Therefore, when the optical density of the non-display area B does not reach a desired value only with the colored layer 40, it is preferable to provide a shielding layer.

In this specification, a layer formed by a plating method is referred to as a plating layer. Therefore, even if it is a plating layer formed by the direct plating method on the surface of the back plate 30 or the surface of the base layer formed on the surface of the back plate 30, the layer including the plating layer formed on the substrate is used as the back plate. Even a plating layer formed by transferring to the surface of 30 is included in the plating layer defined in this specification. The plating layer formed by the direct plating method is preferable because it has higher durability against bending. In the case where the colored layer 40 is formed by transferring onto the surface of the back plate 30, for example, a thermal transfer method can be employed. However, the back plate 30 is deformed, changed in size, etc. by heat according to the thermal transfer method. Therefore, the direct plating method is preferable from this point as well.

Specific examples of the plating method include known plating methods such as electrolytic plating, electroless plating, hot dipping, chemical vapor deposition, and physical vapor deposition. Examples of the physical vapor deposition include an evaporation system including a method of evaporating by heating an evaporation source such as vacuum vapor deposition, molecular beam vapor deposition, and ion beam vapor deposition, and a sputtering system such as magnetron sputtering and ion beam sputtering. In this specification, examples of the metal constituting the plating layer include Al ₂ O ₃ , TiO ₂ , SiO ₂ , and In.

The plating layer can be formed by combining patterning so as to have a desired shape. By performing patterning, a plating layer can be provided on a part of the surface of the back plate 30 on the bonding layer 20 side. Thereby, for example, since the plating layer formed in the display area A can be removed, the distinction between the non-display area B and the display area A can be clarified, and the visibility of the display area A can be improved. . As a specific patterning method when the plating layer is formed by the direct plating method,
i) After forming the plating layer on the entire surface of the back plate 30, the transparent protective layer is covered only on the region corresponding to the deposition layer 40 of the plating layer, and the region not covered with the protective layer is removed by etching. how to,
ii) A method of protecting the surface of the back plate 30 other than the region corresponding to the colored layer 40 with a mask, and then forming a plating layer only in the region corresponding to the colored layer 40, and the like.

  The thickness of the plating layer is preferably 100 nm or more and 3000 nm or less, and more preferably 500 nm or more and 2000 nm or less. By setting the thickness of the plating layer to 100 nm or more, the reflected light from the plating layer is easily visually recognized. Moreover, durability with respect to a bending can be improved by the thickness of a plating layer being 3000 nm or less.

  When the coloring layer 40 has a plating layer, it may be composed of a single plating layer or may be composed of a plurality of layers including a plating layer. In the case where the colored layer 40 is configured to have another layer on the upper side (the bonding layer 20 side) of the plating layer, the upper layer of the plating layer is at least a level where the reflected light from the plating layer is visible. A transparent layer is preferable. For example, a transparent protective layer is preferable. Specifically, it can be a transparent protective layer provided in order to prevent the plating layer of the colored layer 40 from being removed during the patterning process. The colored layer 40 may have a colorant-containing layer having a high light-shielding property, an underlayer for improving adhesion, or the like below the plating layer (on the back plate 30 side). The protective layer provided to cover the plating layer only needs to be formed so as to cover at least a part of the surface on the viewing side of the plating layer, and is formed so as to cover the entire surface including the side surface of the plating layer. It doesn't have to be. The underlayer provided on the lower side of the plating layer is covered with the plating layer, and the plating layer only needs to be formed so as to cover at least a part of the surface on the viewing side of the underlayer, and includes the side surface of the underlayer. It is not necessary to be formed so as to cover the entire surface.

  Examples of the colorant contained in the colorant-containing layer include carbon black such as acetylene black and black colorant such as iron black. The protective layer and the colorant-containing layer can be formed by a method such as a printing method or a coating method. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by a printing method may be repeated to obtain a layer having a desired thickness. Examples of the ink used in the printing method include an ink containing a binder, a solvent, an optional additive, and the like. In the case of forming the colored layer-containing layer, an ink containing a colorant is used.

  Examples of the binder include chlorinated polyolefin (for example, chlorinated polyethylene, chlorinated polypropylene), polyester resin, urethane resin, acrylic resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer, and cellulose resin. . Binder resin may be used independently and may use 2 or more types together. The binder resin may be a heat polymerizable resin or a photopolymerizable resin.

  When a colorant-containing layer is formed by a printing method, it is preferable to use an ink that is contained in an amount of 50 to 200 parts by mass with respect to 100 parts by mass of the binder resin.

  When the colored layer 40 is provided on the peripheral edge of the back plate 30, it is not limited to the form provided on the entire periphery of the peripheral part, and is provided on only a part of the peripheral part according to a desired design or the like. Also good. When providing the colored layer 40 in the peripheral part of the backplate 30, the width | variety can be suitably determined according to the magnitude | size of a display area, a desired design, etc., for example, it is preferable that it is the range of 1-20 mm. . Moreover, although it is preferable that the colored layer 40 is provided in the whole area | region of a non-display area | region, the structure provided in the one part area | region of a non-display area | region may be sufficient.

(Polarizer)
Examples of the polarizing plate include a stretched film in which a dye having absorption anisotropy is adsorbed, or a film including a film obtained by applying and curing a dye having absorption anisotropy as a polarizer. Examples of the dye having absorption anisotropy include a dichroic dye. Specifically, iodine or a dichroic organic dye is used as the dichroic dye. The dichroic organic dye includes a dichroic direct dye comprising a disazo compound such as CI DIRECT RED 39, and a dichroic direct dye comprising a compound such as trisazo and tetrakisazo. As a film coated with a dye having absorption anisotropy used as a polarizer, a stretched film on which a dye having absorption anisotropy is adsorbed, a composition containing dichroic dye having liquid crystallinity, or two Examples thereof include a film having a layer obtained by applying and curing a composition containing a chromatic dye and a polymerizable liquid crystal. A film obtained by applying and curing a dye having absorption anisotropy is preferable because the bending direction is not limited as compared to a stretched film on which a dye having absorption anisotropy is adsorbed.

(1) Polarizing plate comprising a stretched film as a polarizer A polarizing plate comprising a stretched film adsorbed with a dye having absorption anisotropy as a polarizer will be described. A stretched film on which a pigment having absorption anisotropy as a polarizer is adsorbed is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, and by staining the polyvinyl alcohol-based resin film with a dichroic pigment, It is manufactured through a step of adsorbing a dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing with water after the treatment with the boric acid aqueous solution. Such a polarizer may be used as it is as a polarizing plate, or one having a transparent protective film bonded to one or both sides may be used as a polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm to 40 μm.

  The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate resin, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, copolymers of vinyl acetate and other monomers copolymerizable therewith are used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

  The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol resin is usually about 1,000 to 10,000, preferably in the range of 1,500 to 5,000.

  A film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizing plate. The method for forming a polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method. The film thickness of the polyvinyl alcohol-based raw film can be, for example, about 10 μm to 150 μm.

  Uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before dyeing with the dichroic dye, simultaneously with dyeing, or after dyeing. When uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, it is also possible to perform uniaxial stretching in these several steps. In uniaxial stretching, it may be uniaxially stretched between rolls having different peripheral speeds, or may be uniaxially stretched using a hot roll. Further, the uniaxial stretching may be dry stretching in which stretching is performed in the air, or may be wet stretching in which stretching is performed in a state where a solvent is used and a polyvinyl alcohol-based resin film is swollen. The draw ratio is usually about 3 to 8 times.

  The material of the protective film to be bonded to one or both sides of the polarizer is not particularly limited. For example, the cellulose acetate type is made of a resin such as a cyclic polyolefin resin film, triacetyl cellulose, or diacetyl cellulose. Films known in the art, such as resin film, polyester resin film made of resin such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate resin film, (meth) acrylic resin film, polypropylene resin film, etc. Can be mentioned. From the viewpoint of thinning, the thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more, preferably 20 μm or more. . The protective film may or may not have a retardation.

(2) Polarizing plate provided with a film formed from a liquid crystal layer as a polarizer A polarizing plate provided with a film formed from a liquid crystal layer as a polarizer will be described. As a film coated with a dye having absorption anisotropy used as a polarizer, a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound is used as a base material. Examples thereof include a film obtained by applying and curing. The film may be used as a polarizing plate with the base material peeled off or together with the base material, or may be used as a polarizing plate in a configuration having a protective film on one or both sides. As the said protective film, the same thing as the polarizing plate provided with an above described stretched film as a polarizer is mentioned.

  The film obtained by applying and curing a dye having absorption anisotropy is preferably thin, but if it is too thin, the strength is lowered and the processability tends to be inferior. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.

  Specific examples of the film obtained by applying the dye having absorption anisotropy include the films described in JP2013-37353A and JP2013-33249A.

  The polarizing plate may further include a retardation film. The retardation film can include one or more retardation layers. The retardation layer can be a positive A plate such as a λ / 4 plate or a λ / 2 plate, and a positive C plate. The retardation layer may be formed from a resin film exemplified as the material of the above-described protective film, or may be formed from a layer obtained by curing a polymerizable liquid crystal compound. The retardation film may further contain an alignment film or a substrate film. When the polarizer and the retardation film are arranged so that the absorption axis of the polarizer and the slow axis of the retardation film are at a predetermined angle, the polarizing plate has an antireflection function, that is, as a circularly polarizing plate. Can function.

(Touch sensor panel)
As long as the touch sensor panel can detect a touched position, the detection method is not limited, and a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic method, and an electromagnetic induction coupling. Examples of the touch sensor panel include a method and a surface acoustic wave method. Since the cost is low, a resistive film type or capacitive coupling type touch sensor panel is preferably used.

  An example of a resistive film type touch sensor panel includes a pair of substrates opposed to each other, an insulating spacer sandwiched between the pair of substrates, and a transparent film provided as a resistive film on the inner front surface of each substrate A conductive film and a touch position detection circuit are included. In the image display device provided with the resistive film type touch sensor panel, when the surface of the front plate 10 is touched, the opposing resistive film is short-circuited, and current flows through the resistive film. The touch position detection circuit detects a change in voltage at this time, and the touched position is detected.

  An example of a capacitively coupled touch sensor panel includes a substrate, a position detection transparent electrode provided on the entire surface of the substrate, and a touch position detection circuit. In the image display device provided with the capacitively coupled touch sensor panel, when the surface of the front plate 10 is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point. The touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.

  The touch sensor panel may have a thickness of 5 to 500 μm, preferably 10 to 100 μm.

[Method for producing optical laminate]
The manufacturing method of the optical layered product according to one embodiment of the present invention includes a colored layer forming step of forming the colored layer on a part of the outermost surface layer on the bonding layer side of the back plate, and a colored layer forming step. Laminating step of laminating the bonding layer on the outermost surface layer. FIG. 9 is a cross-sectional view schematically showing a method for manufacturing an optical layered body according to one embodiment of the present invention. The optical laminate manufacturing method according to one embodiment of the present invention includes a step of preparing the back plate 30 (FIG. 9A), and a colored layer forming step of forming the colored layer 40 on the surface of the back plate 30 ( 9 (b)), a laminating step of laminating the back plate 30, the bonding layer 20 and the front plate 10 on which the colored layer 40 is formed to obtain the optical laminate 100 (FIG. 9 (e)), Have

  Before the laminating step (FIG. 9E), the step of preparing the front plate 10 (FIG. 9C), the step of providing the bonding layer 20 on the surface of the front plate 10 (FIG. 9D) You may have.

  When the back plate 30 is a polarizing plate, the back plate (laminated body obtained in FIG. 9B) on which the colored layer 40 obtained in the intermediate stage of the manufacturing method is formed becomes a polarizing plate with a colored layer. The surface of the back plate 30 on which the colored layer 40 is formed is the viewing side surface of the polarizing plate. As described above, the polarizing plate with a colored layer is useful for obtaining the optical laminate 100 having high durability against bending.

  In the case where the back plate 30 is a composite layer, in FIG. 9A, instead of the step of preparing the back plate 30, one of the back plates 30 including the outermost surface layer on the bonding layer 20 side of the back plate 30. It is good also as a process of preparing a part. In this case, the timing at which the back plate 30 made of the composite layer is formed is not limited, and may be after the step of FIG. The method shown in FIG. 11 described later corresponds to this method. In addition, the expression with the outermost surface layer by the side of the bonding layer of the backplate 30 shall include both the outermost surface layer before comprising the backplate 30, and the outermost surface layer after comprising the backplate 30.

[Application of image display device]
The image display apparatus according to the present invention can be used as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signboards, measuring instruments and instruments, office equipment, medical equipment, computer equipment, and the like. Since the optical layered body of the present invention has a colored layer and has durability against bending, it is possible to provide a high-quality image display device in which occurrence of defects in appearance is suppressed.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these examples.

(Examples 1 to 3, Comparative Examples 1 and 2)
<Preparation of colored layer forming composition (black)>
[Ink component]
Acetylene black 15% by mass
75% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 5.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone
[Production method]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink component, followed by stirring to obtain a colored layer forming composition (black).

<Preparation of colored layer forming composition (white)>
[Ink component]
Titanium dioxide 50% by mass
Polyester 39% by mass
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 6.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone
[Production method]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink component, followed by stirring to obtain a colored layer forming composition (white).

<Example 1>
The optical laminated body of Example 1 was produced according to the procedure shown in FIG. Specifically, a 70 μm thick window film (base film 50 μm, each hard coat layer 10 μm, length 177 mm × width 105 mm) having hard coat layers formed on both sides of the base film is prepared as the front plate 10 ( 11 (c)), a (meth) acrylic pressure-sensitive adhesive layer (thickness 25 μm, length 177 mm × width 105 mm) was prepared as the bonding layer 20. The base film of the window film is a polyimide resin film, and the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the terminal. Then, the corona treatment was performed to the bonding surface with the adhesive layer of a window film, and the bonding surface with the window film of an adhesive layer. And the window film and the adhesive layer were bonded together and the window film with an adhesive layer was obtained (FIG.11 (d)).

  A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to a substrate and cured to obtain a polarizer having a thickness of 2 μm. On the polarizer, a triacetyl cellulose (TAC) film having a thickness of 25 μm was bonded via an adhesive layer. A retardation film including a layer obtained by polymerizing and curing a liquid crystal compound on an exposed surface after peeling off a substrate (thickness: 17 μm, layer structure: overcoat layer (cured layer of acrylic resin composition, thickness: 1 μm)) / A pressure-sensitive adhesive layer (thickness 5 μm) / λ / 4 plate (thickness 3 μm) composed of a liquid crystal compound cured layer and an alignment film / Adhesive layer (thickness 5 μm) / A liquid crystal compound cured layer and an alignment film And a positive C plate (thickness 3 μm). A polarizing plate 60d thus prepared ("TAC / polarizer / retardation film" layer configuration, thickness 44 μm, length 177 mm × width 105 mm) was prepared (FIG. 11A), and the TAC of the polarizing plate 60d. On the surface of the film, printing of a discharge amount of 3 μm after drying was repeated twice by screen printing using a 460 mesh screen using the colored layer forming composition (black) prepared above as ink. Then, a black colored layer 40 having a thickness of 6 μm and a width of 5 mm was formed on the entire periphery of the peripheral portion to obtain a polarizing plate with a colored layer (FIG. 11B).

  Thereafter, the window film with the pressure-sensitive adhesive layer and the polarizing plate with the colored layer are laminated so that the surfaces on which the pressure-sensitive adhesive layer and the colored layer are respectively formed are corona-treated, and then these surfaces are inward, and rolls It bonded using the joining machine (FIG.11 (e)). Further, on the surface of the polarizing plate 60d opposite to the window film side, a touch sensor pattern is formed on the touch sensor panel 71 (cyclic olefin-based resin film (thickness 23 μm)) via an adhesive layer 21 (thickness 25 μm). (With a thickness of 10 μm) were laminated so that the cyclic olefin-based resin film was a surface layer, to obtain an optical laminate of Example 1 (FIG. 11F). In the optical laminated body of Example 1, the laminated body composed of “polarizing plate 60d / adhesive layer 21 / touch sensor panel 71” corresponds to the back plate 30. The distance d1 from the surface near the window film in the colored layer 40 to the outermost surface on the window film side in the optical laminate was 89 μm. The distance d2 from the surface of the colored layer 40 on the side far from the window film to the outermost surface on the side of the cyclic olefin-based resin film in the optical laminate was 102 μm. The magnitude of the difference between the two was 13 μm, and the magnitude D of the relative difference was 6.8% (≈100 × | (102−89) / (102 + 89) |).

<Example 2>
When forming the colored layer, printing with a discharge amount of 6 μm after drying is repeatedly performed by screen printing twice to form a colored layer 40 having a thickness of 12 μm and a width of 5 mm on the entire circumference. Except for the points described above, an optical laminate was produced in the same manner as in Example 1. The distance d1 is 83 μm, the distance d2 is 102 μm, the difference between them is 19 μm, and the relative size D is 10.3% (≈100 × | (102−83) / (102 + 83) |).

<Example 3>
When the colored layer is formed, the composition for forming a colored layer (black) is used as an ink, and printing is performed twice by screen printing so that the coating thickness after drying is 3 μm, and then on the printed layer. From the above, the composition for forming a colored layer (white) is used as an ink by screen printing, and printing is repeated three times with a discharge amount so that the coating thickness after drying is 5 μm. An optical laminate was produced in the same manner as in Example 1 except that a white colored layer 40 of 5 mm was formed. The distance d1 is 74 μm, the distance d2 is 102 μm, the difference between them is 28 μm, and the relative size D is 15.9% (≈100 × | (102−74) / (102 + 74) |).

<Comparative Example 1>
The optical laminated body of the comparative example 1 was produced in the procedure shown in FIG. Specifically, a 70 μm thick window film (base film 50 μm, each hard coat layer 10 μm, length 177 mm × width 105 mm) having hard coat layers formed on both sides of the base film is prepared as the front plate 10 ( FIG. 12 (b)). The base film of the window film is a polyimide resin film, and the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the terminal. And on the bonding surface with the adhesive layer of a window film, printing of the discharge amount from which the coating thickness after drying becomes 6 micrometers by screen printing using the composition (black) for coloring layer preparation prepared above as ink. Was repeated twice to form a black colored layer 41 having a thickness of 12 μm and a width of 5 mm on the entire periphery of the peripheral portion to obtain a window film with a colored layer (FIG. 12C).

  Moreover, the (meth) acrylic-type adhesive layer (25 micrometers in thickness, length 177 mm * width 105 mm) was prepared as the bonding layer 20, and the corona treatment was performed to the bonding surface with a window film. And after giving corona treatment to the surface in which the colored layer of the window film was formed, the adhesive layer was bonded and the window film in which the colored layer and the adhesive layer were provided was obtained (FIG.12 (d)). .

  A composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to a substrate and cured to obtain a polarizer having a thickness of 2 μm. On the said polarizer, the adhesive bond layer was dissolved and the 25-micrometer-thick triacetyl cellulose (TAC) film was bonded. A retardation film including a layer obtained by polymerizing and curing a liquid crystal compound on an exposed surface after peeling off a substrate (thickness: 17 μm, layer structure: overcoat layer (cured layer of acrylic resin composition, thickness: 1 μm)) / A pressure-sensitive adhesive layer (thickness 5 μm) / λ / 4 plate (thickness 3 μm) composed of a liquid crystal compound cured layer and an alignment film / Adhesive layer (thickness 5 μm) / A liquid crystal compound cured layer and an alignment film And a positive C plate (thickness 3 μm). A polarizing plate 60d thus prepared (a layer configuration of “TAC / polarizer / retardation film”, thickness 44 μm, length 177 mm × width 105 mm) was prepared (FIG. 12A). Thereafter, the TAC side surface of the polarizing plate 60d is subjected to corona treatment so that the TAC side is on the inner side of the surface on which the colored layer and the adhesive layer of the window film provided with the colored layer and the adhesive layer are formed. The polarizing plates were laminated and bonded using a roll bonding machine (FIG. 12 (e)). Further, on the surface of the polarizing plate 60d opposite to the window film side, a touch sensor pattern is formed on the touch sensor panel 71 (cyclic olefin-based resin film (thickness 23 μm)) via an adhesive layer 21 (thickness 25 μm). (With a thickness of 10 μm) were laminated so that the cyclic olefin-based resin film was a surface layer, to obtain an optical laminate of Comparative Example 1 (FIG. 12 (f)). In the optical laminate of Comparative Example 1, the laminate composed of “polarizing plate 60d / adhesive layer 21 / touch sensor panel 71” corresponds to the back plate 30. The distance d1 from the surface near the window film in the colored layer 41 to the outermost surface on the window film side in the optical laminate was 70 μm. The distance d2 from the surface of the colored layer 41 on the side far from the window film to the outermost surface on the side of the cyclic olefin-based resin film in the optical laminate was 115 μm. The difference between them was 45 μm, and the relative difference was 24.3% (≈100 × | (115−70) / (115 + 70) |).

<Comparative example 2>
When the colored layer is formed, the composition for forming a colored layer (black) is used as an ink, and printing is performed twice by screen printing so that the coating thickness after drying is 3 μm, and then on the printed layer. From the above, the composition for forming a colored layer (white) is used as an ink by screen printing, and printing is repeated three times with a discharge amount so that the coating thickness after drying is 5 μm. An optical laminate was produced in the same manner as in Comparative Example 1 except that a 5 mm white colored layer 41 was formed. The distance d1 is 70 μm, the distance d2 is 106 μm, the magnitude of the difference between them is 36 μm, and the relative magnitude D is 20.5% (≈100 × | (106−70) / (106 + 70) |).

[Evaluation test]
The optical laminates of Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to an evaluation test for confirming durability against bending using a bending evaluation facility (STS-VRT-500, manufactured by Science Town). . FIG. 10 is a diagram schematically showing the method of this evaluation test. As shown in FIG. 10, two mounting tables 501 and 502 that can be moved individually are arranged so that the gap C is 2.5 mm, and the optical stack is arranged so that the center in the width direction is located at the center of the gap C. The body 100 was fixed and arranged (FIG. 10A). At this time, the optical laminated body 100 was arrange | positioned so that a window film (front plate 10) might become upper. Then, the two mounting tables 501 and 502 were rotated 90 degrees upward with the positions P1 and P2 as the centers of the rotation axes, and bending force was added to the region of the optical laminated body 100 corresponding to the gap C of the mounting table. (FIG. 10 (b)). Thereafter, the two mounting tables 501 and 502 were returned to their original positions (FIG. 10A). The series of operations described above was completed, and the number of times of bending force was counted as one. By accumulating the number of times the bending force is added, the presence or absence of cracks in the colored layer in the region of the optical laminate 100 corresponding to the gap C between the mounting tables 501 and 502 is confirmed. The addition was stopped and the following criteria were used for evaluation. Table 1 shows the evaluation results. The moving speed of the mounting tables 501 and 502 and the pace of application of the bending force were set to the same conditions in the evaluation tests for all optical laminates.
A: Cracks did not occur even when the number of bending force additions reached 200,000.
B: Cracks occurred when the bending force was applied 150,000 to less than 200,000.
C: Cracks occurred when the number of times of bending force applied was 100,000 or more and less than 150,000,
D: Cracks occurred when the bending force was applied more than 50,000 and less than 100,000.
E: Cracks occurred when the bending force was applied less than 50,000.

(Examples 4 and 5)
<Preparation of composition for forming colorant-containing layer (black)>
[Ink component]
Acetylene black 15% by mass
75% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 5.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone [Preparation method]
10 parts by mass of the curing agent and 10 parts by mass of the solvent were added to 100 parts by mass of the ink component and stirred to obtain a colorant-containing layer forming composition (black).

<Preparation of protective layer forming composition (transparent)>
[Ink component]
90% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 5.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone [Preparation method]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink component, followed by stirring to obtain a composition for forming a protective layer.

<Preparation of composition for forming colorant-containing layer (metal silver color)>
[Ink component]
Aluminum powder (metal pigment) 15% by mass
75% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
Isophorone 5.5% by mass
[Curing agent]
Aliphatic polyisocyanate 75% by mass
Ethyl acetate 25% by mass
[solvent]
Isophorone [Preparation method]
10 parts by mass of a curing agent and 10 parts by mass of a solvent were added to 100 parts by mass of the ink component and stirred to obtain a colorant-containing layer forming composition (metal silver color).

<Preparation of photosensitive resin composition>
[resin]
Acrylate polymer 7% by mass
Methacrylate monomer 81% by mass
[Curing agent]
1,6-hexane diisocyanate 10% by mass
Triphenylphosphine 2% by mass
[Preparation method]
The above components were mixed and stirred to obtain a photosensitive resin composition.

<Production of pressure-sensitive adhesive sheet>
On a mass basis, 84 parts 2-ethylhexyl acrylate, 15 parts isobornyl acrylate, 1 part hydroxypropyl acrylate, and 0.02 parts 1-hydroxycyclohexyl phenyl ketone as a polymerization initiator were mixed. The mixture was irradiated with ultraviolet rays to polymerize the monomer.
Thereafter, 0.4 parts 1-hydroxycyclohexyl phenyl ketone, 0.3 parts lauryl acrylate, 0.05 parts polyethylene glycol (200) diacrylate, 0.05 parts (3-glycidyloxypropyl) as polymerization initiators. ) Trimethoxysilane was added to the above mixture to prepare an adhesive composition.
The pressure-sensitive adhesive composition was coated on a polyethylene terephthalate film (release film) whose surface was treated with silicon. The coating thickness was 25 μm. Another release film was prepared and laminated on the coating film. The laminate having a layer structure of release film / adhesive film / release film was irradiated with ultraviolet rays. In the ultraviolet irradiation process, 300 to 400 nm of ultraviolet light (the light emission intensity reached a maximum at 365 nm) was applied to the laminate so that the integrated light amount was 1500 mJ / cm ² . Thus, the adhesive sheet provided with a (meth) acrylic-type adhesive layer was produced.

<Example 4>
(Preparation of window film with adhesive layer)
The optical laminated body of Example 1 was produced according to the procedure shown in FIG. Specifically, a 70 μm thick window film (base film 50 μm, each hard coat layer 10 μm, length 177 mm × width 105 mm) having hard coat layers formed on both sides of the base film is prepared as the front plate 10 ( The (meth) acrylic pressure-sensitive adhesive layer (thickness 25 μm, length 177 mm × width 105 mm) of the pressure-sensitive adhesive sheet prepared above was used as the bonding layer 20 in FIG. The base film of the window film is a polyimide resin film, and the hard coat layer is a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the terminal. Then, the corona treatment was performed to the bonding surface with the adhesive layer of a window film, and the bonding surface with the window film of an adhesive layer. And a window film and an adhesive layer were bonded together and the window film with an adhesive layer was obtained (FIG.9 (d)).

(Preparation of polarizing plate)
After forming a photo-alignment film on the substrate, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to the substrate, and aligned and cured to obtain a polarizer having a thickness of 2 μm. On the polarizer, a triacetyl cellulose (TAC) film having a thickness of 25 μm was bonded via an adhesive layer. A retardation film including a layer obtained by polymerizing and curing a liquid crystal compound on an exposed surface after peeling off a substrate (thickness: 17 μm, layer structure: overcoat layer (cured layer of acrylic resin composition, thickness: 1 μm)) / A pressure-sensitive adhesive layer (thickness 5 μm) / λ / 4 plate (thickness 3 μm) composed of a liquid crystal compound cured layer and an alignment film / Adhesive layer (thickness 5 μm) / A liquid crystal compound cured layer and an alignment film And a positive C plate (thickness 3 μm). The polarizing plate thus prepared (layer structure of “TAC / polarizer / retardation film”, thickness 44 μm, length 177 mm × width 105 mm) was prepared as the back plate 30 (FIG. 9A).

(Formation of colored layer)
On the surface of the TAC of the polarizing plate, a discharge amount that the coating thickness after drying becomes 3 μm by screen printing using a 460 mesh screen using the colorant-containing layer forming composition (black) prepared above as an ink Was printed to form a black print layer having a thickness of 3 μm and a width of 5 mm in the non-display area.

Using an electron beam evaporation device (product name: UNIVAC2050, manufactured by UNIVAC) on the TAC surface of the polarizing plate on which the black print layer is formed, an evaporation layer having a thickness of 80 mm is formed using TiO ₂ as an evaporation source, A vapor deposition layer having a thickness of 500 mm is formed thereon using In as a vapor deposition source, a vapor deposition layer having a thickness of 150 mm is formed thereon using TiO ₂ as a vapor deposition source, and Al ₂ O ₃ is deposited thereon as a vapor deposition source. A deposited layer having a thickness of 150 mm was formed. In this way, a four-layered gold deposition layer (plating layer, thickness <1 μm) was formed in the entire region including the non-display region and the display region. Then, the coating thickness after drying is 5 μm by screen printing using a 460 mesh screen using the protective layer forming composition (transparent) prepared above as an ink in a non-display area on the surface of the gold deposition layer. A protective layer was formed by printing with a discharge amount to be obtained, and the gold vapor deposition layer in an area where the protective layer was not formed (display area) was removed by etching. In this way, in the non-display area, a layer configuration of “black printed layer (thickness 3 μm) / gold deposition layer (thickness <1 μm) / protective layer (thickness 5 μm)” (overall thickness greater than 8 μm and less than 9 μm ) Was formed (FIG. 9B).

(Production of optical laminate)
Thereafter, the surface of the pressure-sensitive adhesive layer of the window film with the pressure-sensitive adhesive layer and the surface of the polarizing plate on which the colored layer 40 is formed are subjected to corona treatment so that the surface subjected to the corona treatment is on the inside. The layered window film and the polarizing plate were laminated and bonded using a roll bonding machine to obtain an optical laminate of Example 4 (FIG. 9 (e)).

<Example 5>
An optical layered body of Example 2 was obtained by the same method as Example 3 except that the colored layer 40 was formed by the thermal transfer method as follows (FIG. 9E).

  The photosensitive resin composition prepared above is applied to the surface of a base film for thermal transfer (PET film having a thickness of 100 μm) so that the thickness after curing is 8 μm, and an ultraviolet irradiation device (product name: UV Pattern). The resin layer was formed by curing the coating layer by irradiating ultraviolet rays with a machine (manufactured by JM UV Tech).

Using an electron beam evaporation device (product name: UNIVAC2050, manufactured by UNIVAC), an evaporation layer having a thickness of 80 mm is formed on the entire surface of the resin layer on the surface of the base film using TiO ₂ as an evaporation source. A vapor deposition layer having a thickness of 500 mm is formed using In as a vapor deposition source, a vapor deposition layer having a thickness of 150 mm is formed thereon using TiO ₂ as a vapor deposition source, and a thickness of 150 mm is formed thereon using Al ₂ O ₃ as a vapor deposition source. The deposited layer was formed. In this way, a four-layer gold deposition layer (plating layer, thickness <1 μm) was formed. Then, after drying by screen printing using a 460 mesh screen using the colorant-containing layer forming composition (black) prepared as above in an area corresponding to a non-display area on the surface of the gold vapor-deposited layer A black printing layer (thickness 3 μm) is formed by printing with a discharge amount so that the coating thickness of the coating is 3 μm, and the gold deposition layer in the area where the black printing layer is not formed (area corresponding to the display area) is removed by etching. did. In this way, a colored layer precursor having a layer configuration of “golden vapor deposition layer (thickness <1 μm) / black printing layer (thickness 3 μm)” was formed on the base film for thermal transfer.

  Application after drying by screen printing using a 460 mesh screen using the protective layer forming composition (transparent) prepared above as ink on the entire surface of the base film on which the colored layer precursor is formed A discharge amount with a thickness of 3 μm was printed to form a semi-dry protective layer (functioning as an adhesive layer during thermal transfer). Then, using a thermal transfer device (product name: 2D transfer equipment, manufactured by Iroomo), the resin layer containing the colored layer precursor was thermally transferred to the TAC surface of the polarizing plate, and “gold deposition layer (thickness <1 μm) A colored layer precursor having a layer configuration of “/ black printed layer (thickness 3 μm)” was provided on the TAC surface of the polarizing plate, and this was used as the colored layer 40.

[Evaluation test]
The optical laminates of Examples 4 and 5 were subjected to an evaluation test for confirming durability against bending using a bending evaluation facility (STS-VRT-500, manufactured by Science Town). FIG. 10 is a diagram schematically showing the method of this evaluation test. As shown in FIG. 10, two mounting tables 501 and 502 that are individually movable are arranged so that the gap C is 5.0 mm (2.5 R), and the center in the width direction is located at the center of the gap C. Thus, the optical laminate 100 was fixed and arranged (FIG. 10A). At this time, the optical laminated body 100 was arrange | positioned so that a window film (front plate 10) might become upper. Then, the two mounting tables 501 and 502 were rotated 90 degrees upward with the positions P1 and P2 as the centers of the rotation axes, and bending force was added to the region of the optical laminated body 100 corresponding to the gap C of the mounting table. (FIG. 10 (b)). Thereafter, the two mounting tables 501 and 502 were returned to their original positions (FIG. 10A). The series of operations described above was completed, and the number of times of bending force was counted as one. By accumulating the number of times the bending force is added, the presence or absence of cracks in the colored layer in the region of the optical laminate 100 corresponding to the gap C between the mounting tables 501 and 502 is confirmed. The addition was stopped and the following criteria were used for evaluation. Table 1 shows the evaluation results. The moving speed of the mounting tables 501 and 502 and the pace of application of the bending force were set to the same conditions in the evaluation tests for all optical laminates.
A: Cracks did not occur even when the number of bending force additions reached 200,000.
B: Cracks occurred when the bending force was applied 150,000 to less than 200,000.
C: Cracks occurred when the number of times of bending force applied was 100,000 or more and less than 150,000,
D: Cracks occurred when the bending force was applied more than 50,000 and less than 100,000.
E: Cracks occurred when the bending force was applied less than 50,000.

  10 front plate, 20 bonding layer, 30 back plate, 40, 41 colored layer, 60a, 60b, 60c, 60d polarizing plate, 70 touch sensor panel, 81 liquid crystal display unit, 82 organic EL display unit, 90 backlight unit, 100, 101, 102, 103, 104 Optical laminate, 200 display laminate, 300 image display device, 301, 302 liquid crystal display device, 303, 304 organic EL display device, 305, 306 flexible display, 501, 502 mounting table, A display area, B non-display area, C gap.

Claims (18)

An optical laminate comprising a front plate, a bonding layer and a back plate in this order,
The optical laminated body further provided with the colored layer provided in a part on the surface at the side of the said bonding layer of the said backplate.   The optical layered body according to claim 1, wherein the colored layer has a thickness of 3 μm or more.   The optical laminated body according to claim 1 or 2, wherein the front plate is a resin film.   The optical laminated body of any one of Claims 1-3 in which the said back plate has a polarizing plate.   The image display apparatus provided with the optical laminated body of any one of Claims 1-4, and the said front plate being arrange | positioned in the front surface. A polarizing plate;
A colored layer-attached polarizing plate, comprising: a colored layer provided on a part of the surface on the viewing side of the polarizing plate. A manufacturing method for manufacturing the optical layered body according to any one of claims 1 to 4,
A colored layer forming step of forming the colored layer on a part of the outermost surface layer on the bonding layer side of the back plate;
A laminating step of laminating the bonding layer on the outermost surface layer after the colored layer forming step. An optical laminate comprising a front plate, a bonding layer and a back plate in this order,
Further comprising a colored layer provided on a part of the surface on the bonding layer side of the back plate,
The colored layer includes a plated layer.   The optical laminated body according to claim 8, wherein the colored layer further includes a protective layer that covers the plating layer.   The optical layered body according to claim 8 or 9, wherein the colored layer further includes an underlayer coated with the plating layer.   The optical laminate according to claim 10, wherein the underlayer includes a black pigment.   The optical layered body according to any one of claims 8 to 11, wherein the colored layer has a thickness of 1 µm to 30 µm. The optical layered body is distinguished into a display region and a non-display region in a plane direction perpendicular to the stacking direction,
The colored layer is provided in the non-display area,
The optical laminate according to any one of claims 8 to 12, wherein the non-display area has an optical density of 3 or more.   The optical laminated body of any one of Claims 8-13 whose said front plate is a resin film.   The optical laminated body of any one of Claims 8-14 in which the said back plate has a polarizing plate.   An image display device comprising the optical laminate according to claim 8, wherein the front plate is disposed on the front surface. A polarizing plate;
A colored layer provided on a part of the viewing side surface of the polarizing plate,
The colored layer is a polarizing plate with a colored layer having a plating layer. A method for producing the optical layered body according to any one of claims 8 to 15,
A colored layer forming step of forming the colored layer on a part of the outermost surface layer on the bonding layer side of the back plate;
A laminating step of laminating the bonding layer on the outermost surface layer after the colored layer forming step.

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