JP2020019277A - Laminate and method for manufacturing the same - Google Patents

Abstract

To provide a flexible laminate having no surface unevenness on a visible side of the laminate.SOLUTION: A laminate is provided, which includes a first optical member constituted by at least one layer, a bonding layer, and a second optical member constituted by at least one layer in the described order, and further includes a colored layer partially formed on the bonding layer side of the first optical member or the second optical member. The optical member is disposed closer to the visible side of the laminate than the second optical member and satisfies expression (1) S>S, where Srepresents the total sum of a product Pbetween an elastic modulus Eand thickness tof each layer constituting the first optical member, and Srepresents the total sum of a product Pbetween an elastic modulus Eand thickness tof each layer constituting the second optical member.SELECTED DRAWING: None

Description

  The present invention relates to a laminate and a method for producing the same.

  Patent Literature 1 describes a laminate in which a front plate and a smoothing layer are laminated, and a printed layer is formed as a colored layer on a peripheral portion of a surface of the front plate on the smoothing layer side.

JP 2014-238533 A

  In the laminate including the optical member in which the coloring layer is partially formed, at the boundary between the region where the coloring layer exists and the region where the coloring layer does not exist, distortion occurs in a reflected image visually recognized on the surface of the laminate, and appearance quality is reduced. May drop.

  The present invention is a laminate including a first optical member and a second optical member, and is visually recognized on the surface of the laminate on the first optical member side at a boundary between a region where a colored layer is present and a region where the colored layer is not present. Provided is a laminate that does not cause distortion in a reflected image.

The present invention provides the following laminate and a method for producing the same.
[1] A laminate comprising, in this order, a first optical member composed of at least one layer, a bonding layer, and a second optical member composed of at least one layer,
Further provided is a colored layer partially formed on the surface of the first optical member or the second optical member on the bonding layer side,
The first optical member is disposed closer to the viewing side of the laminate than the second optical member,
A laminate that satisfies the following formula (1).
S _Pa > S _Pb (1)
[Where,
S _Pa represents the sum of the products _{P a} of the elastic modulus _{E a} and the thickness _{t a} of each layer constituting the first optical member,
S _Pb represents the sum of the products _{P b} of the elastic modulus _{E b} and the thickness _{t b} of each layer constituting the second optical member. ]
[2] The laminate according to [1], wherein the first optical member is a front plate, and the front plate includes a resin film.
[3] The laminate according to [1] or [2], wherein the second optical member includes at least one selected from the group consisting of a touch sensor panel and a polarizing plate.
[4] The laminate according to any one of [1] to [3], wherein the colored layer is partially formed on a surface of the second optical member on the bonding layer side.
[5] The laminate according to any one of [1] to [4], wherein the thickness of the colored layer is 0.1 μm or more and 30 μm or less.
[6] A display device including the laminate according to any one of [1] to [5].
[7] The method for producing a laminate according to any one of [1] to [5],
A preparing step of preparing the first optical member and the second optical member;
A colored layer forming step of partially forming a colored layer on one surface of the first optical member or the second optical member;
A bonding step of bonding the first optical member and the second optical member via a bonding layer;
And a manufacturing method.

  According to the invention, it is a laminate including the first optical member and the second optical member, and is visually recognized on the surface of the laminate on the first optical member side at a boundary between a region where the colored layer exists and a region where the colored layer does not exist. It is possible to provide a laminate in which distortion is not generated in a reflection image to be formed.

It is a schematic sectional drawing of the laminated body by one Embodiment of this invention. FIG. 1 is a schematic sectional view of a laminate according to a first embodiment of the present invention. It is an outline sectional view of a layered product by a 2nd embodiment of the present invention. It is an outline sectional view of a layered product by a 3rd embodiment of the present invention. It is sectional drawing which shows typically an example of the manufacturing method of the laminated body of this invention. It is a figure which shows the method of the evaluation test in an Example typically.

  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 drawings below, the scales are appropriately adjusted to facilitate understanding of the components, and the scales of the components shown in the drawings do not always match the scales of the actual components.

<Laminate>
FIG. 1 is a schematic sectional view of a laminate according to an embodiment of the present invention. The laminate 100 shown in FIG. 1 includes a first optical member 10 composed of at least one layer, a bonding layer 20, and a second optical member 30 composed of at least one layer in this order. The laminate 100 further includes a coloring layer 40 formed partially on the second optical member.

The laminate 100 satisfies the following expression (1).
S _Pa > S _Pb (1)
[Where,
S _Pa represents the sum of the products _{P a} modulus of elasticity of each layer _E a and (GPa) and thickness _t a (mm) constituting the first optical member 10,
S _Pb represents the sum of the products _{P b} of the elastic modulus of each layer _E b (GPa) and thickness _t b (mm) constituting the second optical member 30. ]
In the present invention, the elastic modulus is a value measured at 25 ° C.

  In a laminate in which the first optical member and the second optical member are bonded via a bonding layer, distortion occurs in a reflection image visually recognized on the surface of the laminate, and the appearance quality of the laminate deteriorates. There is. The present inventor conducted research on generation of distortion, and when the colored layer was partially formed on the first optical member or the second optical member, the first optical member was bonded to the second optical member. Sometimes, the colored layer forming portion is extruded to the outside of the laminate (the side to be visually recognized). As a result, the visible side of the laminate is bordered between the colored layer forming portion and the non-colored layer forming portion. It was found that a step was generated on the outer surface of the laminate of the optical member, and that the reflected image was distorted. Further studies on the suppression of the distortion of the reflection image have revealed that, when the first optical member and the second optical member are bonded to each other, the expression (1) is satisfied, whereby the reflection image is less likely to be distorted. I found it. This is because the optical member on the side of the laminate that is not visible is more easily deformed than the optical member on the side where the laminate is visible, so that the deformation of the optical member on the side where the laminate is visible is suppressed, and the surface of the laminate is suppressed. Is presumed to be flat. Note that the distortion of the reflected image includes not only a case where the reflected image is visually recognized as being distorted, but also a case where the reflected image is visually recognized as being interrupted or the outline being broken.

S _Pa and _{S Pb may} be less _{S Pa} and _{S Pb} and the difference is for example 0.005GPa · mm or more 0.3 GPa · mm, preferably in the following 0.020GPa · mm or more 0.20 GPa · mm And more preferably 0.030 GPa · mm or more and 0.16 GPa · mm or less.

For S _Pa and S _Pb , the ratio of S _{Pb to} S _Pa may be, for example, 0.1 or more and less than 1, preferably 0.2 or more and 0.9 or less, more preferably 0.3 or more and 0.85 or less. It is as follows.

  The first optical member 10 and the second optical member 30 are each composed of at least one layer. The first optical member 10 and the second optical member 30 may be composed of only one layer, or may be composed of two or more layers. Preferably, at least one of the first optical member 10 and the second optical member 30 has two or more layers, and more preferably, the second optical member 30 has two or more layers.

  The thickness, the elastic modulus, and the number of layers of each layer constituting the first optical member 10 and the second optical member 30 can be selected so as to satisfy Expression (1).

  The laminate 100 preferably includes only the bonding layer 20 and the partially formed colored layer 40 between the first optical member 10 and the second optical member 30 from the viewpoint of suppressing distortion of the reflected image.

  The shape of the laminate 100 in the plane direction may be, for example, a square shape, preferably a square shape having long sides and short sides, and more preferably a rectangle. When the shape in the plane direction of the laminate 100 is rectangular, the length of the long side may be, for example, 10 mm or more and 1400 mm or less, and preferably 50 mm or more and 600 mm or less. The length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.

  The thickness of the laminate 100 is not particularly limited because it varies depending on the function required for the laminate and the use of the laminate, but is, for example, 20 μm or more and 1,000 μm or less, preferably 50 μm or more and 500 μm or less, and 80 μm or more It is 300 μm or less.

  In the laminate 100, a step formed on the outer surface of the laminate on the first optical member 10 side may be, for example, 350 nm or less, preferably 300 nm or less, more preferably 200 nm or less, and further preferably 100 nm or less. When the step is 350 nm or less, the reflected image viewed on the surface on the first optical member side tends to be hardly distorted. The step is preferably 0 nm, but a step of 5 nm or more may exist, or a step of 10 nm or more may exist.

  The laminate 100 is preferably bendable. The laminate 100 is preferably capable of bending at a radius of curvature of 2.5 mm. Bendable means that the laminate 100 can be bent without causing cracks. It is preferable that the laminate 100 can be bent in a direction in which the first optical member 10 is located inside. More preferably, the laminate 100 does not crack even when the inner surface of the structure has a radius of curvature of 2.5 mm and the number of bending times is 10,000.

  The laminate 100 can be used for, for example, a display device. The display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescent display device. The display device may have a touch panel function. The laminate 100 is suitable for a flexible display device.

(First optical member)
The first optical member 10 is a member arranged on the viewing side of the laminate with respect to the second optical member 30. For example, when the laminate 100 is used for a display device, in the display device, the laminate 100 includes a display element included in the display device with the first optical member 10 facing outward (the side opposite to the display element side, that is, the viewing side). It is arranged on the viewing side of. As long as the first optical member 10 is a plate-shaped body that can transmit light, the material and thickness are not limited, and may be composed of only one layer, or may be composed of two or more layers. A glass plate (eg, a glass plate, a glass film, etc.) and a resin plate (eg, a resin plate, a resin sheet, a resin film, etc.) are exemplified.

  The thickness of the first optical member 10 may be, for example, 30 μm or more and 500 μm or less, preferably 50 μm or more and 200 μm or less, and more preferably 50 μm or more and 100 μm or less. In the present invention, the thickness of each layer can be measured according to a thickness measurement method described in Examples described later.

Sum _S Pa of the product _{P a} of the elastic modulus _{E a} and the thickness _{t a} of each layer constituting the first optical member 10 (GPa · mm) may be up to e.g. 0.015GPa · mm or more 20 GPa · mm, Preferably it is 0.1 GPa-mm or more and 10 GPa-mm or less, More preferably, it is 0.15 GPa-mm or more and 5 GPa-mm or less, More preferably, it is 0.2 GPa-mm or more and 1 GPa-mm or less.

When the first optical member 10 is a glass plate, a tempered glass for a display is preferably used as the glass plate. The thickness _{t a} of the glass plate may be for example 0.05mm to 1mm. Elastic modulus of the glass plate _{E a} may be for example 500GPa or more 1,000GPaMPa less. By using a glass plate, the first optical member 10 having excellent mechanical strength and surface hardness can be configured. In the present invention, the elastic modulus of each layer can be measured according to an elastic modulus measuring method described in Examples described later.

  When the first optical member 10 is a resin film, the resin film is not limited as long as the resin film 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, polyether sulfone, 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 naphthalate , Films made of polymers such as polycarbonate and polyamideimide It is below. These polymers can be used alone or in combination of two or more. From the viewpoint of improving strength and transparency, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide is preferable.

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. By providing the hard coat layer, a resin film having improved hardness and scratch resistance 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 an acrylic resin, a silicone resin, a polyester resin, a urethane resin, an amide resin, and an epoxy resin. The hard coat layer may contain an additive to improve the strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof. The thickness _{t a} of the resin film may be for example 30μm or more 2,000μm or less, preferably 50μm or more 1,000μm or less, more preferably 50μm or more 500μm or less, or may be 100μm or less. Modulus _{E a} of the resin film, for example, may be at 500MPa or more 10,000MPa less, preferably not more than 9,000MPa least 1,000 MPa, more preferably not more than 8,000MPa least 2,000 MPa, more preferably Is 3,000 MPa or more and 7,000 MPa or less.

  When the laminate 100 is used in a display device, the first optical member 10 may have a function as a component used in a normal display device, for example, a front plate (window film) in the display device. When the first optical member 10 functions as a front plate, the first optical member 10 may have not only a function of protecting the front surface of the display device but also a function as a touch sensor, a blue light cut function, a viewing angle adjusting function, and the like. . The front plate preferably includes the above-described resin film.

(Second optical member)
As the second optical member 30, a plate-like body that can transmit light, a component used in a normal display device, or the like can be used.

  The thickness of the second optical member 30 may be, for example, 5 μm or more and 2,000 μm or less, preferably 10 μm or more and 1,000 μm or less, and more preferably 15 μm or more and 500 μm or less. The thickness of the second optical member may be smaller or larger than the thickness of the first optical member.

Sum _S Pb (GPa · mm) of the product _{P b} of the elastic modulus _{E b} and the thickness _{t b} of each layer constituting the second optical member 30 may be less for example 0.01 GPa · mm or more 10 GPa · mm, It is preferably 0.015 GPa-mm or more and 6 GPa-mm or less, more preferably 0.02 GPa-mm or more and 5 GPa-mm or less, and still more preferably 0.04 GPa-mm or more and 3.5 GPa-mm or less.

  The plate-like body may be composed of only one layer or may be composed of two or more layers, and those exemplified for the plate-like body described in the first optical member 10 can be used.

  As components used in a normal display device used for the second optical member 30, for example, a touch sensor panel, a polarizing plate, a retardation film, and the like can be given. The second optical member 30 includes at least one selected from the group consisting of a touch sensor panel and a polarizing plate.

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

  An example of a resistive touch panel is a pair of substrates arranged opposite 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. It is composed of a conductive film and a touch position detection circuit. In an image display device provided with a resistive touch panel, when the surface of the first optical member 10 is touched, the opposing resistive film is short-circuited, and a current flows through the resistive film. The touch position detection circuit detects the change in the voltage at this time, and the touched position is detected.

  One example of a capacitively-coupled touch sensor panel includes a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit. In the image display device provided with the touch sensor panel of the capacitance coupling type, when the surface of the first optical member 10 is touched, the transparent electrode is grounded via the capacitance of the human body at the touched point. . A touch position detection circuit detects grounding of the transparent electrode, and detects a touched position.

The thickness _{t b} of the touch sensor panel may be for example 5μm least 2,000μm or less, or may be 5μm or 100μm or less. The elastic modulus _Eb of the touch sensor panel may be, for example, 1,000 MPa or more and 7,000 MPa or less.

(Polarizer)
Examples of the polarizing plate include a stretched film on which a dye having absorption anisotropy is adsorbed, and a film containing, as a polarizer, a film coated with a dye having absorption anisotropy and cured. Examples of the dye having absorption anisotropy include dichroic dyes. As the dichroic dye, specifically, iodine or a dichroic organic dye is used. Dichroic organic dyes include C.I. I. A dichroic direct dye composed of a disazo compound such as DIRECT RED 39 and a dichroic direct dye composed of a compound such as trisazo and tetrakisazo are included. Used as a polarizer, as a film coated with a dye having absorption anisotropy and cured, a composition containing a dichroic dye having a liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal Examples include a film having a layer obtained by coating and curing. A film coated with a dye having absorption anisotropy and cured is preferable, as compared with a stretched film on which a dye having absorption anisotropy is adsorbed, because there is no restriction on the bending direction.

(1) Polarizing plate having stretched film as polarizer A polarizing plate having a stretched film on which a dye having absorption anisotropy is adsorbed as a polarizer will be described. A stretched film on which a dye having absorption anisotropy is adsorbed, which is a polarizer, is usually formed by uniaxially stretching a polyvinyl alcohol-based resin film, and dyeing the polyvinyl alcohol-based resin film with a dichroic dye. It is manufactured through a step of adsorbing the dichroic dye, a step of treating the polyvinyl alcohol-based resin film to which the dichroic dye is adsorbed with a boric acid aqueous 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 obtained by bonding a transparent protective film on one or both surfaces thereof may be used as a polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm or more and 40 μm or less.

  The polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is 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 degree of saponification of the polyvinyl alcohol-based resin is generally 85 mol% or more and 100 mol% or less, and preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol-based resin is usually about 1,000 or more and 10,000 or less, and preferably in the range of 1,500 or more and 5,000 or less.

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

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

A stretched film thickness _{t b} of the polarizing plate comprising a polarizer may be for example 1μm or 400μm or less, or may be 5μm or 100μm or less. The elastic modulus _Eb of a polarizing plate having a stretched film as a polarizer may be, for example, 1,000 MPa or more and 5,000 MPa or less.

The material of the protective film to be bonded to one or both surfaces of the polarizer is not particularly limited, for example, cyclic polyolefin resin film, triacetyl cellulose, cellulose acetate based resin such as diacetyl cellulose Films known in the art, such as resin films, polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resin films, (meth) acrylic resin films, and polypropylene resin films. Can be mentioned. The thickness _{t b} of the protective film, from the viewpoint of thinning is usually 300μm or less, preferably 200μm or less, more preferably 100μm or less, and is generally 5μm or more and 20μm or more Is preferred. The protective film may or may not have a retardation. The elastic modulus _Eb of the protective film may be, for example, 1,000 MPa or more and 5,000 MPa or less.

(2) Polarizing plate provided with a film formed of a liquid crystal layer as a polarizer A polarizing plate provided with a film formed of a liquid crystal layer as a polarizer will be described. As a film coated with a dye having absorption anisotropy, which is 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 as a base material Films obtained by coating and curing are exemplified. The film may be used as a polarizing plate by peeling the base material 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 surfaces thereof. As the protective film, the same one as the polarizing plate including the above-described stretched film as a polarizer can be used.

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

  Specific examples of the film obtained by applying the dye having the absorption anisotropy include the films described in JP-A-2013-148883.

The thickness t _b of the polarizing plate comprising a film formed from the liquid crystal layer as a polarizer, for example may be at 1μm or more 50μm or less, the elastic modulus E _b of the polarizing plate having the formed liquid crystal layer film as a polarizer For example, it may be 500 MPa or more and 5,000 MPa or less.

(Retardation film)
The retardation film can include one or more retardation layers. As the retardation layer, a positive A plate such as a λ / 4 plate or a λ / 2 plate, and a positive C plate can be used. 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 in which a polymerizable liquid crystal compound is cured. The retardation film may further include an alignment film and a base film.

The thickness t _{b of the} retardation film may be, for example, 1 μm or more and 50 μm or less, and the elastic modulus E _b of a polarizing plate including a film formed from a liquid crystal layer as a polarizer is, for example, 1,000 MPa or more and 4,000 MPa or less. May be.

(Lamination layer)
The bonding layer 20 is a layer interposed between the first optical member 10 and the second optical member 30 to bond them, and may be, for example, a pressure-sensitive adhesive layer or an adhesive layer. The bonding layer 20 is preferably a pressure-sensitive adhesive layer from the viewpoint of being able to favorably absorb the steps of the coloring layer 40.

  The pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber-based, urethane-based, ester-based, silicone-based, or polyvinyl ether-based resin as a main component. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin having excellent transparency, weather resistance, heat resistance and the like as a base polymer is preferable. 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 2- (meth) acrylate. A polymer or copolymer having one or more (meth) acrylates such as ethylhexyl as a monomer is preferably used. Preferably, a polar monomer is copolymerized with the base polymer. Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include 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 base polymer, but usually further contains a crosslinking agent. The crosslinking agent is a divalent or higher valent metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Among them, a polyisocyanate compound is preferable.

  The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with an active energy ray such as an ultraviolet ray or an electron beam. And the like. The pressure-sensitive adhesive composition has a property of being able to adhere to an adherend such as that described above, and having a property of being hardened by irradiation with active energy rays to adjust the adhesion. The active energy ray-curable pressure-sensitive adhesive composition is preferably of an ultraviolet-curable type. 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.

  The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powders and other inorganic powders). Etc.), additives such as antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators and the like.

  It can be formed by applying an organic solvent diluted solution of the above-mentioned pressure-sensitive adhesive composition on a substrate and drying it. 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 larger than the thickness of the coloring layer 40 from the viewpoint of absorbing the steps of the coloring layer 40, for example, preferably 3 μm or more and 100 μm or less, more preferably 5 μm or more and 50 μm or less. , 20 μm or more.

(Colored layer)
For example, when used in a display device, the coloring layer 40 has a function of improving the visibility of a displayed image and the like, and preventing wiring and the like in the display device from being viewed from outside the display device. The colored layer 40 may have, for example, an optical density of 3 or more, and preferably 3.2 or more.

  The shape and color of the coloring layer 40 are not limited, and can be appropriately selected depending on, for example, the use and design of the display device using the laminate. The coloring layer 40 contains a coloring agent. The coloring layer 40 may be composed of only one layer, or may be composed of two or more layers. When the coloring layer 40 is composed of two or more layers, at least one of the two or more layers is a coloring agent-containing layer containing a coloring agent, and the remaining layers contain a coloring agent. It may not contain a coloring agent. Examples of the color of the colorant include black, red, white, dark blue, silver, and gold. The coloring layer 40 may have a colorant-containing layer having a high light-shielding property, a base layer for improving adhesion, and the like below the colorant-containing layer containing a colorant. Further, it may have a transparent protective layer covering the colorant-containing layer.

  The colorant can be appropriately selected according to the desired color. Examples of the coloring agent include inorganic pigments such as carbon black such as titanium dioxide, zinc white, and acetylene black, iron black, red iron oxide, chrome vermilion, ultramarine, cobalt blue, graphite, and titanium yellow; phthalocyanine blue, and indasulene Organic pigments or dyes such as blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, and aniline black; metal pigments composed of scale-like foil pieces such as aluminum and brass; titanium dioxide-coated mica; basic lead carbonate And other pearlescent pigments (pearl pigments) composed of scale-like foil pieces. In this specification, the metal contained in the plating layer is also included in the coloring agent.

  Each layer of the colored layer 40 can be formed by a printing method, a coating method, a plating method, or the like. In FIG. 1, the colored layer 40 is partially formed on the surface of the second optical member 30 on the bonding layer 20 side, but the colored layer 40 is formed on the surface of the first optical member 10 on the bonding layer 20 side. It may be partially formed thereon. The coloring layer 40 may be formed directly on the surface of the first optical member 10 or the second optical member 30 on the bonding layer 20 side, or may be formed on another base material. Alternatively, it may be formed by transferring onto the surface of the second optical member 30 on the side of the bonding layer 20. 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 the colored layer 40 having a desired thickness. Examples of the ink used in the printing method include an ink containing a colorant, a binder, a solvent, an optional additive, and the like. The colored layer 40 is preferably formed partially on the surface of the second optical member 30 on the side of the bonding layer 20 from the viewpoint of reducing the level difference.

  Examples of the binder include chlorinated polyolefins (for example, chlorinated polyethylene and chlorinated polypropylene), polyester resins, urethane resins, acrylic resins, vinyl acetate resins, vinyl chloride-vinyl acetate copolymers, and cellulose resins. . The binder resin may be used alone or in combination of two or more. The binder resin may be a thermopolymerizable resin or a photopolymerizable resin.

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

  Specific examples of the plating method include known plating methods such as electrolytic plating, electroless plating, hot-dip plating, chemical vapor deposition, and physical vapor deposition. Examples of the physical vapor deposition include an evaporation system including a method of heating and evaporating an evaporation source such as vacuum evaporation, molecular beam evaporation, and ion beam evaporation, and a sputtering system such as magnetron sputtering and ion beam sputtering. These methods can be combined with patterning as needed. In this specification, a layer formed by a plating method is referred to as a plating layer.

  When the coloring layer 40 is provided on the peripheral portion of the first optical member 10 or the second optical member 30, the present invention is not limited to the configuration provided on the entire periphery of the peripheral portion. It may be a form provided only in the section. When the coloring layer 40 is provided on the peripheral portion of the first optical member 10 or the second optical member 30, the width can be appropriately determined according to the size of the display area, a desired design, and the like. It is preferable to be within the following range.

  The thickness of the coloring layer 40 is preferably 30 μm or less, more preferably 25 μm or less. When the thickness of the coloring layer 40 is within the above numerical range, bubbles generated at the interface with the bonding layer 20 can be suppressed. The thickness of the coloring layer 40 may be, for example, 0.1 μm or more, and preferably 3 μm or more. When the thickness of the coloring layer 40 is 0.1 μm or more, the coloring layer 40 is easily visible, which contributes to improvement in design, and also contributes to improvement in optical density.

  FIG. 1 illustrates a case where the thickness of the colored layer 40 is uniform and the cross-sectional shape is rectangular. However, the thickness of the colored layer 40 may not be uniform. The cross-sectional shape may have a tapered portion. By having the tapered portion, it is possible to suppress the entrapment of air that is likely to occur during lamination. When the thickness of the coloring layer 40 is not uniform, the numerical range described above as the thickness of the coloring layer 40 is the maximum thickness of the coloring layer 40.

(1st Embodiment)
FIG. 2 is a schematic sectional view of the laminate according to the first embodiment of the present invention. The laminate 101 includes a front plate 11, a bonding layer 20, a plate 31, and a coloring layer 40. In FIG. 2, the coloring layer 40 is partially formed on the surface of the plate-shaped body 31 on the bonding layer 20 side, but the coloring layer 40 is partially formed on the surface of the front plate 11 on the bonding layer 20 side. May be formed. In the present embodiment, the front plate 11 corresponds to a first optical member, and the plate-like body 31 corresponds to a second optical member.

(2nd Embodiment)
FIG. 3 is a schematic sectional view of a laminate according to the second embodiment of the present invention. The laminate 102 includes a front plate 11, a bonding layer 20, a plate 31, a polarizing plate 32, a retardation film 33, a touch sensor panel 34, and a coloring layer 40. In FIG. 3, the colored layer 40 is partially formed on the surface of the plate-shaped body 31 on the bonding layer 20 side, but the colored layer 40 is partially formed on the surface of the front plate 11 on the bonding layer 20 side. May be formed. In the present embodiment, the front plate 11 corresponds to a first optical member, and the structure from the plate 31 to the touch sensor panel 34 corresponds to a second optical member.

(Third embodiment)
FIG. 4 is a schematic sectional view of the laminate according to the third embodiment of the present invention. The laminate 103 includes a glass plate 12, a bonding layer 20, a plate 31, a polarizing plate 32, a retardation film 33, a touch sensor panel 34, a plate 35, and a plate 36. , A coloring layer 40. In FIG. 4, the coloring layer 40 is partially formed on the surface of the plate-shaped body 31 on the bonding layer 20 side, but the coloring layer 40 is partially formed on the surface of the glass plate 12 on the bonding layer 20 side. May be formed. In the present embodiment, the glass plate 12 corresponds to a first optical member, and the structure from the plate 31 to the plate 36 corresponds to a second optical member.

<Production method of laminate>
FIG. 5 is a cross-sectional view schematically illustrating a method for manufacturing a laminate according to another embodiment of the present invention. The manufacturing method of the laminated body includes a preparation step of preparing the first optical member 10 and the second optical member 30 (FIG. 5A), and coloring one surface of the first optical member 10 or the second optical member 30. A colored layer forming step of partially forming the layer 40 (FIG. 5B), and bonding the first optical member 10 to the surface of the second optical member 30 on the colored layer 40 side via the bonding layer 20. (FIG. 5 (c)).

  In the colored layer forming step, forming the colored layer 40 on the surface of the second optical member 30, and in the laminating step, when bonding the first optical member 10 and the second optical member 30, the above formula is used. By satisfying (1), the occurrence of a step on the surface of the first optical member is suppressed, and it is possible to make it difficult to generate distortion in the reflected image visually recognized on the surface.

  In FIG. 5, in the colored layer forming step, the colored layer 40 is partially formed on one surface of the second optical member 30, but the colored layer 40 is partially formed on one surface of the first optical member 10. It can also be formed as desired.

<Display device>
The display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, a touch panel display device, and an electroluminescent display device. Since the display device of this embodiment includes the bendable laminate 100, the display device can be suitably used for a bendable display device, and particularly, can be suitably used for an organic EL display device.

<Thickness measurement method>
The laminate was cut using a laser cutter. The cross section of the cut laminate was observed using a transmission electron microscope (SU8010; HORIBA, Ltd.), and the thickness of each layer was measured from the obtained observation image.

<Elastic modulus measurement method>
The elastic modulus of each layer constituting the optical member was measured as follows.
A rectangular small piece having a long side of 110 mm and a short side of 10 mm was cut out from a member constituting each layer using a super cutter. Then, the upper and lower grips of a tensile tester [Autograph AG-Xplus tester manufactured by Shimadzu Corporation] sandwiched both ends in the long side direction of the measurement sample so that the distance between the grippers was 5 cm. The sample for measurement was pulled in the length direction of the sample for measurement at a tensile speed of 4 mm / min in an environment of 55 ° C. and a relative humidity of 55%, and a temperature of 23 ° C. was obtained from the slope of a straight line between 20 and 40 MPa in the obtained stress-strain curve. The tensile modulus [MPa] at a relative humidity of 55% was calculated. At this time, as the thickness for calculating the stress, the thickness value of each layer measured as described above was used.

<Step measurement method>
The step at the boundary between the portion where the colored layer was formed and the portion where the colored layer was not formed was measured using an interferometer microscope (Bruker, Contour GT).

<Reflection image evaluation method>
It was confirmed whether or not distortion was visually recognized in the reflection image of the fluorescent lamp visually recognized on the surface of the first optical member of the laminate under the fluorescent lamp.
○: no distortion ×: distortion

<Flexibility test>
The laminates obtained in each of the examples and the comparative examples were subjected to an evaluation test for confirming durability against bending using a bending evaluation facility (STS-VRT-500, manufactured by Science Town). FIG. 6 is a diagram schematically illustrating the method of the present evaluation test. As shown in FIG. 6, two individually movable mounting tables 501 and 502 are arranged so that the gap C is 5.0 mm (2.5R), and the center in the width direction is located at the center of the gap C. The stacked body 100 was fixed and arranged so as to perform the above (FIG. 6A). At this time, the laminated body 100 was arranged such that the front plate (the first optical member 10) was on the upper side. Then, the two mounting tables 501 and 502 are rotated upward by 90 degrees about the position P1 and the position P2 as the centers of the rotation axes, and a bending force is applied to the region of the stacked body 100 corresponding to the gap C between the mounting tables ( FIG. 6 (b)). Thereafter, the two mounting tables 501 and 502 were returned to their original positions (FIG. 6A). The above series of operations was completed, and the number of times of application of the bending force was counted as one. The number of times the bending force is applied is accumulated, and the presence or absence of bubbles or cracks in the region of the stacked body 100 corresponding to the gap C between the mounting tables 501 and 502 is checked. The addition was stopped, and the evaluation was performed based on the following criteria. Table 1 shows the evaluation results. The moving speed of the mounting tables 501 and 502 and the pace of the application of the bending force were set to the same conditions in the evaluation tests for all the laminates.
A: No bubbles or cracks were generated even when the number of times of bending force applied reached 10,000.
B: Bubbles or cracks were generated when the number of times of bending force applied was not less than 70,000 and less than 10,000
C: Bubbles or cracks were generated when the number of times of bending force was applied was 50,000 or more and less than 70000, D: Bubbles or cracks were generated when the number of times of bending force was added was 2,000 or more and less than 55,000. E: The number of times the bending force was applied was less than 22,000, and bubbles or cracks were generated.

<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
5.5% by mass of isophorone
[Curing agent]
75% by mass of aliphatic polyisocyanate
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 colored layer forming composition (black).

<Preparation of Colored Layer Forming Composition (White)>
[Ink component]
50% by mass of titanium dioxide
39% by mass of polyester
Glutaric acid dimethyl ester 2.5% by mass
Succinic acid 2% by mass
6.5% by mass of isophorone
[Curing agent]
75% by mass of aliphatic polyisocyanate
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 the mixture was stirred to obtain a colorant-containing layer forming composition (white).

  <First optical member>

[First optical member A]
Front plate with hard coat layers formed on both sides of base film: thickness 70 μm, elastic modulus 3457 MPa, 177 mm long × 105 mm wide
Base film: 50 μm thick, polyimide (PI) resin film Hard coat layer: 10 μm thick, layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end

[First optical member B]
Glass plate: thickness 70 μm, modulus of elasticity 68,000 MPa, SCHOTT

[First optical member C]
Front plate in which a hard coat layer is formed on one side of a base film: 50 μm in thickness, elastic modulus 4091 MPa
Base film: thickness 40 μm, triacetyl cellulose resin film Hard coat layer: thickness 10 μm

  <Second optical member>

[Second optical member A]
Triacetyl cellulose resin film (TAC): thickness 25 μm, elastic modulus 3282 MPa, Konica Minolta

[Second optical member B]
Polyimide resin film (PI): 25 μm thickness, elastic modulus 3900 MPa, WON IMC

[Second optical member C]
Triacetyl cellulose resin film (TAC): thickness 60 μm, elastic modulus 3282 MPa, Konica Minolta

[Second optical member D]
A laminate in which TAC / polarizer / retardation film / touch sensor panel is laminated in this order, thickness 102.5 μm, length 177 mm × width 105 mm
TAC: thickness 25 μm, elastic modulus 3282 MPa, Konica Minolta Polarizer: thickness 2.5 μm, elastic modulus 937 MPa
Retardation film: thickness 17 μm, layer constitution: overcoat layer (cured layer of acrylic resin composition, thickness 1 μm, elastic modulus 4,510 MPa) / adhesive layer (thickness 5 μm, elastic modulus 0.11 MPa) / liquid crystal compound Λ / 4 plate (thickness 3 μm, elastic modulus 1,624 MPa) composed of cured layer and alignment film / Adhesive layer (thickness 5 μm, elastic modulus 0.11 MPa) / Positive C composed of liquid crystal compound cured layer and alignment film Plate (thickness 3 μm, elastic modulus 2,039 MPa) / adhesive layer (thickness 25 μm, elasticity 0.63 MPa)
Touch sensor panel: thickness 33 μm, layer configuration: touch sensor pattern (laminated body of ITO and cured layer of acrylic resin composition, thickness 7 μm, elastic modulus 4,510 MPa) / adhesive layer (thickness 3 μm, elastic modulus 12, 309 MPa) / Cyclic olefin resin film (thickness 23 μm, elastic modulus 1,785 MPa)

  The second optical member D was manufactured as follows. First, after forming a photo-alignment film on a substrate, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to the substrate, and the composition was aligned and cured to obtain a 2 μm-thick polarizer. A 25 μm-thick triacetyl cellulose (TAC) film was bonded onto the polarizer with an adhesive layer interposed therebetween. The substrate was peeled off, and a cured layer of an acrylic resin composition having a thickness of 1 μm was formed as an overcoat layer on the exposed surface. Further, a retardation film (a λ / 4 plate (thickness: 3 μm) composed of a layer in which the liquid crystal compound is cured and an alignment film) including a layer in which the liquid crystal compound is polymerized and cured through an adhesive layer having a thickness of 5 μm / adhesive A positive C plate (thickness: 3 μm) composed of a layer (thickness: 5 μm) / a layer in which the liquid crystal compound was cured and an alignment film was laminated. Next, the touch sensor panel was bonded to the surface on the side of the retardation film via the adhesive layer to obtain a second optical member D.

[Second optical member E]
A laminate in which the second optical member D / adhesive layer / PI1 / adhesive layer / PI2 is laminated in this order.
PI1: Polyimide resin film (PI), thickness 38 μm, elastic modulus 4,865 MPa, Kolon PI2: Polyimide resin film (PI), thickness 50 μm, elastic modulus 5,800 MPa, Kolon 2nd optical obtained as described above PI1 was bonded to the surface of the member D on the touch sensor panel side via an adhesive layer. An adhesive layer having a thickness of 25 μm and a storage elastic modulus of 0.63 MPa was used. Thereafter, PI2 was bonded to the surface on the PI1 side via the same pressure-sensitive adhesive layer to obtain a second optical member E.

[Second optical member F]
Glass plate: thickness 70 μm, modulus of elasticity 68,000 MPa, SCHOTT

[Second optical member G]
Triacetylcellulose-based resin film (TAC): thickness 40 μm, elastic modulus 3282 MPa, Konica Minolta

<Lamination layer>
(Meth) acrylic pressure-sensitive adhesive layer, thickness 25 μm, length 177 mm x width 105 mm

<Example 1>
On the surface of the front plate (the first optical member A), the colorant-containing layer-forming composition (black) prepared above was used as an ink, and screen-printed using a 460-mesh screen to obtain a coating thickness after drying. Printing with a discharge amount of 3 μm was performed twice to form a black print layer having a thickness of 6 μm and a width of 5 mm on the entire periphery of the peripheral portion. Using the composition for forming a colored layer (white) prepared as described above as an ink in the same region as the black print layer, screen printing was performed, and printing was repeatedly performed three times at a discharge amount such that the coating thickness after drying was 5 μm.

  Corona treatment was performed on the bonding surface of the TAC (second optical member A) with the bonding layer and the bonding surface of the bonding layer with the TAC. Then, the TAC and the pressure-sensitive adhesive layer were bonded to obtain a TAC with a bonding layer.

  Thereafter, a corona treatment is applied to the surface of the front plate on which the colored layer is formed and the surface of the TAC-attached layer with the adhesive layer, and the front plate is attached to the front plate so that the corona-treated surface is on the inside. The laminated TAC was laminated, bonded using a roll bonding machine, and cured in an autoclave to obtain a laminated body of Example 1. The obtained laminate was subjected to a step measurement, a reflection image evaluation, and a flexibility test. Table 1 shows the results.

<Example 2>
A laminate of Example 2 was produced by performing the same operation as in Example 1 except that the second optical member B was used instead of using the second optical member A in Example 1. Table 1 shows the results.

<Example 3>
A laminated body of Example 3 was produced by performing the same operation as in Example 1 except that the second optical member C was used instead of the second optical member A in Example 1. Table 1 shows the results.

<Example 4>
A laminate of Example 4 was produced by performing the same operation as in Example 1 except that the second optical member D was used instead of using the second optical member A in Example 1. Table 1 shows the results.

<Example 5>
The same operation as in Example 1 was performed, except that the first optical member B and the second optical member E were used instead of using the first optical member A and the second optical member A in Example 1. A laminate of Example 5 was produced. However, the flexibility test was not performed. Table 1 shows the results.

<Example 6>
Except that, instead of using the first optical member A in Example 1, the first optical member C was used, and printing using the colored layer forming composition (white) as ink was not performed. Then, the same operation as in Example 1 was performed to produce a laminate of Example 6. Table 1 shows the results.

<Example 7>
A laminated body of Example 7 was produced by performing the same operation as in Example 6, except that the second optical member G was used instead of using the second optical member A in Example 6. Table 1 shows the results.

<Comparative Example 1>
A laminated body of Comparative Example 1 was produced by performing the same operation as in Example 1 except that the second optical member E was used instead of using the second optical member A in Example 1. Table 1 shows the results.

<Comparative Example 2>
A laminated body of Comparative Example 2 was manufactured by performing the same operation as in Example 1 except that the second optical member F was used instead of using the second optical member A in Example 1. However, the flexibility test was not performed. Table 1 shows the results.

<Example 8>
A corona treatment was applied to the bonding surface of the front plate (first optical member A) with the bonding layer and the bonding surface of the bonding layer with the front plate. Then, the front plate and the pressure-sensitive adhesive layer were bonded to obtain a front plate with a bonding layer.

  On the surface of the TAC (second optical member A), the composition for forming a colorant-containing layer (black) prepared above was used as an ink by screen printing using a 460-mesh screen, and the coating thickness after drying was 3 μm. Was performed twice to form a black print layer having a thickness of 6 μm and a width of 5 mm on the entire periphery of the peripheral portion. Using the composition for forming a colored layer (white) prepared as described above as an ink in the same region as the black print layer, screen printing was performed, and printing was repeatedly performed three times at a discharge amount such that the coating thickness after drying was 5 μm.

  Thereafter, a corona treatment is applied to the surface of the bonding layer of the front plate with the pressure-sensitive adhesive layer and the surface on which the colored layer of TAC is formed, so that the surface subjected to the corona treatment is on the inner side. The front plate and the TAC were laminated, bonded using a roll bonding machine, and cured in an autoclave to obtain a laminate of Example 8. The obtained laminate was subjected to a step measurement, a reflection image evaluation, and a flexibility test. Table 2 shows the results.

<Example 9>
A laminated body of Example 9 was produced by performing the same operation as in Example 8 except that the second optical member B was used instead of using the second optical member A in Example 8. Table 2 shows the results.

<Example 10>
A laminated body of Example 10 was manufactured by performing the same operation as in Example 8 except that the second optical member C was used instead of using the second optical member A in Example 8. Table 2 shows the results.

<Example 11>
A laminated body of Example 11 was produced in the same manner as in Example 8, except that the second optical member A was used instead of the second optical member A. Table 2 shows the results.

<Example 12>
The same operation as in Example 8 was performed except that the first optical member A and the second optical member A were used instead of the first optical member B and the second optical member E in Example 8. A laminate of Example 12 was produced. However, the flexibility test was not performed. Table 2 shows the results.

<Comparative Example 3>
A laminated body of Comparative Example 3 was produced by performing the same operation as in Example 8 except that the second optical member E was used instead of using the second optical member A in Example 8. Table 2 shows the results.

<Comparative Example 4>
A laminated body of Comparative Example 4 was produced by performing the same operation as in Example 8 except that the second optical member F was used instead of using the second optical member A in Example 8. However, the flexibility test was not performed. Table 2 shows the results.

  Reference Signs List 10 first optical member, 11 front plate, 12 glass plate, 20 bonding layer, 30 second optical member, 31, 35, 36 plate, 32 polarizing plate, 33 retardation film, 34 touch sensor panel, 40 coloring Layer, 100 to 103 laminated body, 501, 502 Mounting table

Claims (7)

A laminate comprising a first optical member composed of at least one layer, a bonding layer, and a second optical member composed of at least one layer in this order,
Further provided is a colored layer partially formed on the surface of the first optical member or the second optical member on the bonding layer side,
The first optical member is disposed closer to the viewing side of the laminate than the second optical member,
A laminate that satisfies the following formula (1).
S _Pa > S _Pb (1)
[Where,
S _Pa represents the sum of the products _{P a} of the elastic modulus _{E a} and the thickness _{t a} of each layer constituting the first optical member,
S _Pb represents the sum of the products _{P b} of the elastic modulus _{E b} and the thickness _{t b} of each layer constituting the second optical member. ]   The laminate according to claim 1, wherein the first optical member is a front plate, and the front plate includes a resin film.   The laminate according to claim 1, wherein the second optical member includes at least one selected from the group consisting of a touch sensor panel and a polarizing plate.   The laminate according to any one of claims 1 to 3, wherein the coloring layer is partially formed on a surface of the second optical member on the bonding layer side.   The laminate according to any one of claims 1 to 4, wherein the thickness of the coloring layer is 0.1 µm or more and 30 µm or less.   A display device comprising the laminate according to claim 1. It is a manufacturing method of the layered product according to any one of claims 1 to 5,
A preparing step of preparing the first optical member and the second optical member;
A colored layer forming step of partially forming a colored layer on one surface of the first optical member or the second optical member;
A bonding step of bonding the first optical member and the second optical member via a bonding layer;
And a manufacturing method.

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