KR20200011368A - Laminate and method for producing the same - Google Patents

Abstract

The present invention is to provide a bendable laminate without stain on a visible side surface of a laminate. The laminate of the present invention comprises a first optical member formed of at least one layer, an attachment layer, and a second optical member formed of at least one layer. The laminate further comprises a colored layer partially formed on a surface of the attachment layer of the first or second optical member. The first optical member is arranged on a visible side of the laminate more than the second optical member. The laminate satisfies equation (1), S_Pa > S_Pb. In the equation, S_Pa represents the sum of P_a which is obtained by multiplying an elastic modulus E_a and the thickness t_a of each layer constituting the first optical member, and S_Pb represents the sum of P_b which is obtained by multiplying an elastic modulus E_b and the thickness t_b of each layer constituting the second optical member.

Description

Laminated body and its manufacturing method {LAMINATE AND METHOD FOR PRODUCING THE SAME}

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 at a peripheral edge portion of the surface on the smoothing layer side of the front plate.

Japanese Patent Application Laid-Open No. 2014-238533

In the laminate having the optical member, in which the colored layer is partially formed, distortion occurs on the reflection visually recognized on the surface of the laminate at the boundary between the region where the colored layer is present and the region that does not exist. This may fall.

This invention is a laminated body provided with the 1st optical member and the 2nd optical member, The reflection image visually recognized by the surface of the laminated body by the side of a 1st optical member in the boundary between the area | region where a colored layer exists and the area | region which does not exist. Provided is a laminate in which distortion does not occur.

This invention provides the laminated body shown below and its manufacturing method.

[1] 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 with the colored layer formed in part on the surface of the bonding layer side of a said 1st optical member or a 2nd optical member,

The said 1st optical member is arrange | positioned rather than the 2nd optical member at the visual recognition side of a laminated body,

A laminate which satisfies the following formula (1):

S _Pa > S _Pb (1)

[In the meal,

S _Pa represents the total of the product 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 total of the product 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 the surface of the bonding layer side of the second optical member.

[5] The laminate according to any one of [1] to [4], wherein the colored layer has a thickness of 0.1 µm or more and 50 µm or less.

[6] A display device comprising 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 preparation 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,

And a bonding step of bonding the first optical member and the second optical member together via a bonding layer.

According to this invention, it is a laminated body provided with a 1st optical member and a 2nd optical member, and is visually recognized by the surface of the laminated body by the side of a 1st optical member in the boundary between the area | region where a colored layer exists and the area | region which does not exist. It is possible to provide a laminate in which distortion does not occur on the reflection.

1 is a schematic cross-sectional view of a laminate according to one embodiment of the present invention.
It is a schematic sectional drawing of the laminated body by 1st embodiment of this invention.
3 is a schematic cross-sectional view of a laminate according to a second embodiment of the present invention.
It is a schematic sectional drawing of the laminated body by 3rd embodiment of this 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 typically the method of the evaluation test in an Example.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described referring drawings, this invention is not limited to the following embodiment. In all the following drawings, in order to make each component easy to understand, the scale is adjusted suitably and the scale of each component shown in drawing, and the scale of an actual component do not necessarily correspond.

<Laminated body>

1 is a schematic cross-sectional view of a laminate according to one embodiment of the present invention. The laminated body 100 shown in FIG. 1 has the 1st optical member 10 comprised by at least 1 layer, the bonding layer 20, and the 2nd optical member 30 comprised by at least 1 layer in this order. Equipped. The laminate 100 further includes a colored layer 40 partially formed on the second optical member.

The laminated body 100 satisfy | fills following formula (1):

S _Pa > S _Pb (1)

[In the meal,

S _Pa represents the total of the product P _a of the elastic modulus E _a (GPa) and the thickness t _a (mm) of each layer constituting the first optical member 10,

S _Pb represents the total of the product P _b of the elastic modulus E _b (GPa) and the thickness t _b (mm) of each layer constituting the second optical member 30.].

In the present invention, the elastic modulus is a value measured at 25 ° C.

In the laminate in which the first optical member and the second optical member are bonded via the bonding layer, distortion may occur on the reflection visually recognized on the surface of the laminate, resulting in deterioration in appearance quality of the laminate. When the inventors have studied the occurrence of the distortion, when the colored layer is partially formed on the first optical member or the second optical member, the colored layer is bonded when the first optical member and the second optical member are bonded together. The forming portion is pushed out to the outside of the laminate (side that is visible), and as a result, on the outside of the laminate of the optical member on the side where the laminate is visible, as a boundary between the colored layer forming portion and the colored layer non-forming portion. It was found that distortion occurs in the reflection because a step occurs. Further studies have been made regarding suppression of distortion of the reflection image, and when the first optical member and the second optical member are bonded together, the above formula (1) is satisfied, whereby it is difficult to cause distortion on the reflection image. This is because the optical member on the side where the laminate is not visible is more likely to be deformed than the optical member on the side where the laminate is visible, so that deformation of the optical member on the side where the laminate is visible is suppressed and the surface becomes flat. I guess. The distortion of the reflection image includes not only the reflection image being distorted and visually recognized, but also the case where the reflection image is broken in the middle, the outline is broken, or the like.

S _Pa and S _Pb should just be 0.005 GPamm or more and 0.3GPamm or less, for example, and the difference between S _Pa and S _Pb should be 0.020GPamm or more and 0.20GPamm or less, More preferably, 0.030 GPamm or more and 0.16 GPamm or less.

S _Pa and S _Pb should just be 0.1 or more and 1 ratio of S _Pb with respect to S _Pa , for example, Preferably they are 0.2 or more and 0.9 or less, More preferably, they are 0.3 or more and 0.85 or less.

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 1st optical member 10 and the 2nd optical member 30 is comprised by two or more layers, More preferably, the 2nd optical member 30 is comprised by two or more layers.

The thickness, elasticity modulus, and number of layers which comprise the 1st optical member 10 and the 2nd optical member 30 can be selected so that Formula (1) may be satisfied.

The laminate 100 preferably has a bonding layer 20 and a 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. ) Only.

The shape in the plane direction of the laminate 100 may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangular shape. When the shape of the laminated body 100 in the surface direction is rectangular, the length of a long side should just be 10 mm or more and 1400 mm or less, for example, Preferably they are 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.

Since the thickness of the laminated body 100 differs according to the function required for a laminated body, the use of a laminated body, etc., it is not specifically limited, For example, it is 20 micrometers or more and 1,000 micrometers or less, Preferably it is 50 micrometers or more and 500 micrometers or less. More preferably, they are 80 micrometers or more and 300 micrometers or less.

As for the laminated body 100, the level | step difference which arose on the outer surface of the laminated body by the side of the 1st optical member 10 should just be 350 nm or less, for example, Preferably it is 300 nm or less, More preferably, it is 200 nm or less, More preferably, 100 nm or less. When the step is 350 nm or less, the distortion tends to be less likely to occur on the reflection visually recognized on the surface on the first optical member side. Although the step is preferably 0 nm, a step of 5 nm or more may exist and a step of 10 nm or more may exist.

It is preferable that the laminated body 100 is bendable. It is preferable that the laminated body 100 can bend in curvature radius 2.5mm. Bendable means that it can be bent without generating a crack in the laminated body 100. FIG. It is preferable that the laminated body 100 can bend in the direction which made the 1st optical member 10 inward. More preferably, the laminate 100 does not generate cracks even when the number of bends in the radius of curvature of the inner surface of the structure is 2.5 mm.

The laminated body 100 can be used, for example in a display apparatus. A display apparatus is not specifically limited, For example, an organic electroluminescent (organic EL) display apparatus, an inorganic electroluminescent (inorganic EL) display apparatus, a liquid crystal display device, an electroluminescent display device, etc. are mentioned. The display device should just have a touch panel function. The laminate 100 is suitable for a display device having flexibility.

(First optical member)

The 1st optical member 10 is a member arrange | positioned rather than the 2nd optical member 30 at the visual recognition side of a laminated body. For example, when the laminated body 100 is used for a display device, in the display device, the laminated body 100 moves the 1st optical member 10 outside (on the opposite side to the display element side, ie, the viewing side). It is arrange | positioned toward the visual recognition side of the display element which a display apparatus has toward. As long as the 1st optical member 10 is a plate-shaped object which can permeate | transmit light, material and thickness are not limited, It may be comprised only by 1 layer, It may be comprised by two or more layers, and it is a plate-shaped object made of glass (for example, Glass plates, glass films, etc.) and resin plate-shaped bodies (for example, resin plate, resin sheet, resin film, etc.) are illustrated.

The thickness of the 1st optical member 10 should just be 30 micrometers or more and 500 micrometers or less, for example, Preferably they are 50 micrometers or more and 200 micrometers or less, More preferably, they are 50 micrometers or more and 100 micrometers or less. In this invention, the thickness of each layer can be measured in accordance with the thickness measuring method demonstrated in the Example mentioned later.

The total S _Pa (GPa · mm) of the product P _a between the elastic modulus E _a and the thickness t _a of each layer constituting the first optical member 10 may be, for example, 0.015 GPa · mm or more and 20 GPa · mm or less, Preferably they are 0.1 GPa * mm or more and 10 GPa * mm or less, More preferably, they are 0.15 GPa * mm or more and 5 GPa * mm or less, More preferably, they are 0.2 GPa * mm or more and 1 GPa * mm or less.

In the case where the first optical member 10 is a glass plate, tempered glass for display is preferably used as the glass plate. Thickness t _a of _a glass plate should just be 0.05 mm or more and 1 mm or less, for example. The elasticity modulus E _a of _a glass plate should just be 50 GPa or more and 1,000 GPa or less, for example. By using a glass plate, the 1st optical member 10 which has the outstanding mechanical strength and surface hardness can be comprised. In this invention, the elasticity modulus of each layer can be measured in accordance with the elasticity modulus measuring method demonstrated in the Example mentioned later.

In the case where the first optical member 10 is a resin film, 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 Mid, polyether sulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, polymethyl And films formed of polymers such as methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers can be used individually or in mixture of 2 or more types. It is a resin film formed from polymers, such as polyimide, polyamide, and polyamideimide, from a viewpoint of strength and transparency improvement.

The resin film should just be a film which provided the hard-coat layer in at least one surface of a base film, and improved hardness more. The hard coat layer may be formed in one surface of a base film, and may be formed in both surfaces. By providing a hard coat layer, it can be set as the resin film which improved the hardness and scratch resistance. The hard coat layer is, for example, a cured layer of 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 the additive in order to improve strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, or a mixture thereof. Thickness t _a of _a resin film should just be 30 micrometers or more and 2,000 micrometers or less, for example, Preferably they are 50 micrometers or more and 1,000 micrometers or less, More preferably, they are 50 micrometers or more and 500 micrometers or less, and 100 micrometers or less may be sufficient. The elastic modulus E _a of the resin film may be, for example, 500 MPa or more and 10,000 MPa or less, preferably 1,000 MPa or more and 9,000 MPa or less, more preferably 2,000 MPa or more and 8,000 MPa or less, still more preferably 3,000 MPa or more and 7,000 It is below MPa.

When the laminated body 100 is used for a display apparatus, as the 1st optical member 10, it has a function as a component used for a normal display apparatus, for example, a front plate (window film) in a display apparatus. It is good if there is. When the first optical member 10 acts as a front plate, it may not only have a function of protecting the front surface of the display device but also have a function as a touch sensor, a blue light cut function, a viewing angle adjustment function, and the like. It is preferable that a front plate contains the above-mentioned resin film.

(Second optical member)

As the 2nd optical member 30, the plate-shaped object which can permeate | transmit light, the component used for a normal display apparatus, etc. 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 total 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, for example, 0.01 GPa · mm or more and 10 GPa · mm or less, Preferably they are 0.015 GPa * mm or more and 6GPa * mm or less, More preferably, they are 0.02GPa * mm or more and 5GPa * mm or less, More preferably, they are 0.04GPa * mm or more and 3.5GPa * mm or less.

As said plate-shaped object, it may be comprised by only one layer, and may be comprised by two or more layers, and what was illustrated about the plate-shaped body described in the 1st optical member 10 can be used.

As a component used for the normal display apparatus used for the 2nd optical member 30, a touch sensor panel, a polarizing plate, retardation film, etc. are mentioned, for example. The second optical member 30 preferably 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 that can detect a touched position, the detection method is not limited, and a resistive film method, an electrostatic capacitive coupling method, an optical sensor method, an ultrasonic method, an electromagnetic inductive coupling method, and a surface acoustic wave method Touch sensor panels, etc. are illustrated. In terms of low cost, a resistive film type touch panel or a capacitive coupling type touch sensor panel is suitably used.

An example of a resistive touch sensor panel includes a pair of substrates disposed to face each other, an insulating spacer sandwiched between the pair of substrates, and a transparent conductive film provided as a resistive film on the entire surface inside each substrate. And a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, when the surface of the first optical member 10 is touched, the opposing resistive film is shorted, and a 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 the capacitive coupling type touch sensor panel is comprised by a board | substrate, the transparent electrode for position detection provided in the front surface of a board | substrate, and a touch position detection circuit. In the image display device provided with the capacitive touch sensor panel, when the surface of the first optical member 10 is touched, the transparent electrode is grounded through the human body's capacitance at the touched point. The touch position detection circuit detects the ground of the transparent electrode, and the touched position is detected.

The thickness t _b of the touch sensor panel may be, for example, 5 μm or more and 2,000 μm or less, and may be 5 μm or more and 100 μm or less. The elasticity modulus E _b of the touch sensor panel may be 1,000 MPa or more and 7,000 MPa or less, for example.

(Polarizing plate)

As a polarizing plate, the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy, or the film which contains as a polarizer the film which apply | coated and hardened the pigment | dye which has absorption anisotropy is mentioned. As a dye which has absorption anisotropy, a dichroic dye is mentioned, for example. As a dichroic dye, iodine and a dichroic organic dye are used specifically ,. Dichroic organic dyes include C.I. Dichroic direct dye which consists of a dichroic direct dye which consists of disazo compounds, such as DIRECT RED 39, tris azo, tetrakis azo, etc. is contained. As a film which apply | coated and hardened the pigment | dye which has absorption anisotropy used as a polarizer, the layer obtained by apply | coating and hardening the composition containing the dichroic dye which has liquid crystallinity, or the composition containing a dichroic dye and a polymeric liquid crystal is provided. The film which has it, etc. are mentioned. Since the film which apply | coated and hardened the pigment | dye which has absorption anisotropy is cured compared with the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy, it is preferable.

(1) Polarizing Plate Having Stretched Film as Polarizer

The polarizing plate provided with the stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy as a polarizer is demonstrated. The stretched film which adsorb | sucked the pigment | dye which has absorption anisotropy which is a polarizer adsorbs the dichroic dye normally by uniaxially stretching a polyvinyl alcohol-type resin film and dyeing a polyvinyl alcohol-type resin film with a dichroic dye. It is manufactured through the process of making it, the process of processing the polyvinyl alcohol-type resin film which the dichroic dye adsorb | sucked with boric-acid aqueous solution, and the process of washing with water after the process by boric-acid aqueous solution. Such a polarizer may be used as a polarizing plate as it is, and what bonded together the transparent protective film on the single side | surface or both surfaces 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.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate type resin. As polyvinyl acetate type resin, the copolymer of vinyl acetate and the other monomer copolymerizable with it besides the polyvinyl acetate which is a homopolymer of vinyl acetate is used. As another monomer copolymerizable with vinyl acetate, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamide which has an ammonium group, etc. are mentioned, for example.

The saponification degree of polyvinyl alcohol-type resin is 85 mol% or more and 100 mol% or less normally, Preferably it is 98 mol% or more. The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal and polyvinyl acetal modified with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is about 1,000 or more and about 10,000 or less normally, Preferably it is the range of 1,500 or more and 5,000 or less.

What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of a polarizing plate. The method of forming a polyvinyl alcohol-type resin into a film is not specifically limited, It can form into a film by a well-known method. The film thickness of a polyvinyl alcohol base film can be about 10 micrometers or more and about 150 micrometers or less, for example.

Uniaxial stretching of a polyvinyl alcohol-type resin film can be performed before dyeing with a dichroic dye, simultaneously with dyeing, or after dyeing. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before boric acid treatment, or may be performed during boric acid treatment. Moreover, it is also possible to uniaxially stretch in these several steps. In uniaxial stretching, you may extend | stretch to 1 axis | shaft between rolls with different circumferential speeds, and you may extend | stretch to 1 axis using a thermal roll. Moreover, uniaxial stretching may be dry stretching which extends | stretches in air | atmosphere, and wet extending | stretching may be performed in the state which swelled the polyvinyl alcohol-type resin film using a solvent. A draw ratio is about 3 to 8 times normally.

The thickness t _b of the polarizing plate having a stretched film as a polarizer, for example, more than 1㎛ may 400㎛ or less, may be a less than 5㎛ 100㎛. The elastic modulus E _b of the polarizing plate including the stretched film as the polarizer may be, for example, 1,000 MPa or more and 5,000 MPa or less.

Although it does not specifically limit as a material of the protective film bonded to one or both surfaces of a polarizer, For example, cellulose acetate-based resin film which consists of resin, such as cyclic polyolefin type resin film, triacetyl cellulose, diacetyl cellulose, polyethylene Films known in the art, such as polyester resin films made of resins such as terephthalate, polyethylene naphthalate and polybutylene terephthalate, polycarbonate resin films, (meth) acrylic resin films, and polypropylene resin films Can be mentioned. From the viewpoint of thinning, the thickness t _b 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, and preferably 20 μm or more. The protective film may or may not have a phase difference. The elastic modulus E _b of the protective film may be, for example, 1,000 MPa or more and 5,000 MPa or less.

(2) A polarizing plate comprising a film formed of a liquid crystal layer as a polarizer

The polarizing plate which comprises the film formed from the liquid crystal layer as a polarizer is demonstrated. As a film which apply | coated the pigment | dye which has absorption anisotropy used as a polarizer, the film etc. which are obtained by apply | coating the composition containing the dichroic dye which has liquid crystallinity, or the composition containing a dichroic dye and a liquid crystal compound to a base material, etc. are hardened | cured. Can be mentioned. The said film may be used as a polarizing plate by peeling a base material or with a base material, or in the structure which has a protective film in the single side | surface or both surfaces. As said protective film, the thing similar to the polarizing plate which equips said stretched film as a polarizer is mentioned.

Although it is preferable that the film obtained by apply | coating and hardening the pigment | dye which has absorption anisotropy is thin, when it is too thin, there exists a tendency for intensity | strength to fall and inferior to workability. The thickness of the said film is 20 micrometers or less normally, Preferably it is 5 micrometers or less, More preferably, they are 0.5 micrometer or more and 3 micrometers or less.

As a film obtained by apply | coating the pigment | dye which has the said absorption anisotropy, the film of Unexamined-Japanese-Patent No. 2013-148883 etc. is mentioned specifically ,.

The thickness t _b of the polarizing plate having a film formed of the liquid crystal layer as the polarizer, may, for example if a range from 1㎛ 50㎛, a polarizing plate having a film formed of the liquid crystal layer as a polarizer modulus E _b, for example, 500MPa It should just be 5,000 MPa or more.

(Retardation film)

The retardation film may include one or two or more retardation layers. The phase difference layer may be a positive A plate such as a λ / 4 plate or a λ / 2 plate, a negative A plate, and a positive C plate. The retardation layer may be formed of a resin film exemplified as the material of the above-mentioned protective film, or may be formed of a layer on which the 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 the polarizing plate including the film formed of the liquid crystal layer as a polarizer may be, for example, 1,000 MPa or more and 4,000 MPa or less.

(Bonding layer)

The bonding layer 20 is a layer which bonds them together between the 1st optical member 10 and the 2nd optical member 30, for example, what is necessary is just an adhesive layer and an adhesive bond layer. It is preferable that the bonding layer 20 is an adhesive layer from a viewpoint which can absorb the level | step difference of the colored layer 40 favorably.

An adhesive layer can be comprised by the adhesive composition which has resin, such as (meth) acrylic-type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type as a main component. Especially, the adhesive composition which uses (meth) acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is suitable. An active energy ray hardening type and a thermosetting type may be sufficient as an adhesive composition.

Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include, for example, butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. The polymer or copolymer which makes 1 type (s) or 2 or more types in a meta) acrylic acid ester as a monomer is used suitably. It is preferable to copolymerize a polar monomer to a base polymer. As a polar monomer, for example, (meth) acrylic acid, (meth) acrylic acid 2-hydroxypropyl, (meth) acrylic acid hydroxyethyl, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate And monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as glycidyl (meth) acrylate.

Although the adhesive composition may contain only the said base polymer, it usually contains a crosslinking agent further. As a crosslinking agent, it is a divalent or more metal ion which forms a carboxylic acid metal salt between carboxyl groups; As a polyamine compound, forming an amide bond between carboxyl groups; As a polyepoxy compound or polyol, forming an ester bond between carboxyl groups; As a polyisocyanate compound, what forms an amide bond between carboxyl groups is illustrated. Especially, a polyisocyanate compound is preferable.

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 or electron beams, and has adhesiveness even before active energy ray irradiation, and can be adhered to adherends such as a film. It is an adhesive composition which has the property of hardening | curing by adjustment of adhesive force. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curing 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. Moreover, as needed, a photoinitiator, a photosensitizer, etc. may be included.

The pressure-sensitive adhesive composition is composed of fine particles, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powder or other inorganic powders, etc.), antioxidants for imparting light scattering properties, Additives, such as a ultraviolet absorber, dye, a pigment, a coloring agent, an antifoamer, a corrosion inhibitor, a photoinitiator, may be included.

The bonding layer 20 can be formed by apply | coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying. When using an active energy ray hardening-type adhesive composition, it can be set as the hardened | cured material which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

It is preferable that the thickness of the bonding layer 20 is thicker than the thickness of the coloring layer 40 from a viewpoint of absorbing the level | step difference of the coloring layer 40, For example, it is preferable that it is 3 micrometers or more and 100 micrometers or less, and it is 5 micrometers or more. It is more preferable that it is 50 micrometers or less, and 20 micrometers or more may be sufficient.

(Color layer)

When the colored layer 40 is used in a display device, for example, the colored layer 40 has a function of improving visibility of an image to be displayed and preventing the wiring or the like in the display device from being visually viewed from the outside of the display device. As for the colored layer 40, optical density should just be 3 or more, for example, Preferably it is 3.2 or more.

The shape and color of the colored layer 40 are not limited, and can be appropriately selected depending on, for example, the use or design of the display device using the laminate. The coloring layer 40 contains a coloring agent. The colored layer 40 may be comprised only by one layer, and may be comprised by two or more layers. When the coloring layer 40 is comprised from two or more layers, at least 1 layer is a coloring agent containing layer containing a coloring agent among two or more layers, and the remaining layer does not need to contain the coloring agent, even if it contains a coloring agent. . As a color of a coloring agent, black, red, white, dark blue, silver, gold, etc. are illustrated. The colored layer 40 may have a color-shielding layer with high light-shielding property, an underlayer which improves adhesiveness, etc. under the coloring agent containing layer containing a coloring agent. Moreover, you may have a transparent protective layer like coating a coloring agent containing layer.

The colorant may be appropriately selected depending on the desired color. As a coloring agent, For example, carbon black, such as titanium dioxide, zinc-ized, acetylene black, iron black, bengal, chrome vermilion, ultramarine blue, cobalt blue, and yellow lead ), Inorganic pigments such as titanium yellow; Organic pigments or dyes such as phthalocyanine blue, indanthrene blue, isoindolinone yellow, benzidine yellow, quinacridone red, polyazo red, perylene red, and aniline black; Metal pigments composed of flaky flakes such as aluminum and brass; And pearlescent pigments (pearl pigments) composed of flaky flakes such as titanium dioxide coated mica and basic lead carbonate. In this specification, the metal contained in a plating layer shall also be contained in a 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 bonding layer 20 side of the second optical member 30, but the colored layer 40 is the adhesive of the first optical member 10. It may be partially formed on the surface on the side of the layer 20. The colored layer 40 may be directly formed on the surface which becomes the bonding layer 20 side of the 1st optical member 10 or the 2nd optical member 30, and what was formed on another base material is a 1st optical member You may transfer and form on the surface used as the bonding layer 20 side of (10) or the 2nd optical member 30. FIG. Specific examples of the printing method include gravure printing, offset printing, screen printing, and transfer printing from a transfer sheet. Printing by the printing method may be repeated to obtain a colored layer 40 having a desired thickness. As ink used for a printing method, the ink containing a coloring agent, a binder, a solvent, arbitrary additives, etc. are mentioned, for example. The colored layer 40 is preferably partially formed on the surface of the bonding layer 20 side of the second optical member 30 from the viewpoint of step reduction.

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. Binder resin may be used independently and may use 2 or more types together. The binder resin may be a thermal polymerizable resin or a photopolymerizable resin.

When forming a coloring agent containing layer by the printing method, it is preferable to use the ink containing 50 mass parts or more and 200 mass parts or less with respect to 100 mass parts of binder resins.

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. As physical vapor deposition, the evaporation system including the method of heating and evaporating evaporation sources, such as vacuum deposition, molecular beam deposition, and ion beam deposition, sputtering systems, such as magnetron sputtering and ion beam sputtering, is mentioned. These methods can combine patterning as needed. In this specification, the layer formed by the plating method is called a plating layer.

In the case where the colored layer 40 is provided at the peripheral edge of the first optical member 10 or the second optical member 30, the colored layer 40 is not limited to the form provided at the entire circumference of the peripheral edge portion, and according to a desired design or the like, The form may be provided only in a part of the circumferential edge portion. When the colored layer 40 is provided at the circumferential edge portion of the first optical member 10 or the second optical member 30, the width thereof can be appropriately determined according to the size of the display area, the desired design, and the like. For example, it is preferable that it is the range of 1 mm or more and 20 mm or less.

The thickness of the colored layer 40 becomes like this. Preferably it is 30 micrometers or less, More preferably, it is 25 micrometers or less. By the thickness of the colored layer 40 being in the said numerical range, the bubble which generate | occur | produces in the interface with the bonding layer 20 can be suppressed. The thickness of the colored layer 40 should just be 0.1 micrometer or more, for example, Preferably it is 3 micrometers or more. When the thickness of the colored layer 40 is 0.1 micrometer or more, the colored layer 40 becomes easy to be visually recognized and contributes to the improvement of design, and also contributes to the improvement of optical density.

Although the thickness of the colored layer 40 is uniform and the cross-sectional shape is rectangular in FIG. 1, the thickness of the colored layer 40 does not need to be uniform, For example, it is thickness toward inside. The cross-sectional shape like having a taper which becomes thinner may be sufficient. By having a taper part, the interruption of the air which is easy to produce at the time of lamination | stacking can be suppressed. When the thickness of the colored layer 40 is not uniform, the numerical range described as the thickness of the colored layer 40 above is taken as the maximum thickness of the colored layer 40.

(1st embodiment)

2 is a schematic cross-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-like body 31, and a colored layer 40. In FIG. 2, the colored layer 40 is partially formed on the surface on the side of the bonding layer 20 of the plate-shaped body 31, but the colored layer 40 is the bonding layer 20 of the front plate 11. It may be formed partially on the surface of the side. In this embodiment, the front plate 11 corresponds to the first optical member, and the plate-shaped body 31 corresponds to the second optical member.

(2nd embodiment)

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

(Third embodiment)

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

<Method for Manufacturing Laminate>

FIG. 5: is sectional drawing which shows typically the manufacturing method of the laminated body which concerns on other embodiment of this invention. The manufacturing method of a laminated body includes the preparation process of preparing the 1st optical member 10 and the 2nd optical member 30 (FIG. 5 (a)), and the 1st optical member 10 or the 2nd optical member 30. FIG. The colored layer formation process of forming the colored layer 40 partially on one surface of the () (FIG. 5 (b)), and the 1st optical member 10 is colored layer of the 2nd optical member 30 ( The bonding process (FIG. 5 (c)) which bonds together on the surface of 40 side through the bonding layer 20 is included.

In the colored layer forming step, forming the colored layer 40 on the surface of the second optical member 30, and in the bonding step, the first optical member 10 and the second optical member 30 are By satisfy | filling Formula (1) mentioned above at the time of bonding, generation | occurrence | production of a level | step difference is suppressed in the surface of a 1st optical member, and it becomes difficult to produce distortion on the reflection image visually recognized by 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 formed on the first optical member 10. It may form partially on one surface.

<Display device>

It does not specifically limit as a display apparatus, For example, an organic electroluminescent (organic EL) display apparatus, an inorganic electroluminescent (inorganic EL) display apparatus, a liquid crystal display, a touch panel display, an electroluminescent display, etc. Can be mentioned. Since the display apparatus of this embodiment has the flexible laminated body 100, it can be used suitably as a bendable display apparatus, and can be especially used suitably as an organic EL display apparatus.

Example

<Thickness measurement method>

The laminated body was cut using the laser cutter. The cross section of the cut laminated body was observed using the transmission electron microscope (SU8010; Horiba Seisakusho), and the thickness of each layer was measured from the obtained observation image.

<Elastic rate measuring method>

The elasticity modulus of each layer which comprises an optical member was measured as follows.

The rectangular small piece of long side 110mm x short side 10mm was cut out from the member which comprises each layer using the super cutter. Subsequently, the upper and lower chucks of a tensile tester (Autograph AG-Xplus tester manufactured by Shimadzu Seisakusho Co., Ltd.) were fitted with both ends of the long side direction of the measurement sample such that the interval between the chucks was 5 cm, and the temperature was 23 ° C. 23 degreeC from the inclination of the straight line between 20-40 Mpa in the stress-torsion curve obtained by tensioning a sample for a measurement in the longitudinal direction of a sample for a measurement at a tensile velocity of 4 mm / min in an environment of 55% relative humidity. , The tensile modulus of elasticity [MPa] at 55% relative humidity was calculated. At this time, the thickness value of each layer measured as mentioned above was used as thickness for calculating stress.

<Step measurement method>

Using an interferometer microscope (Bruker, Contour GT), 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.

<Reflection evaluation method>

It was confirmed whether distortion was visually recognized on the reflection of the fluorescent lamp visually recognized by the surface of the 1st optical member of a laminated body under fluorescent lamp.

○: no distortion

×: There is distortion

<Flexibility test>

About the laminated body obtained in each Example and the comparative example, the evaluation test which confirms durability to bending was performed using the bending evaluation apparatus (STS-VRT-500 by the Science Town company). 6 is a diagram schematically illustrating the method of the evaluation test. As shown in FIG. 6, the two mounting tables 501 and 502 which are movable independently are arrange | positioned so that clearance C may be set to 5.0 mm (2.5R), and a laminated body so that the center of the width direction may be located in the center of clearance C. As shown in FIG. (100) was fixed and arranged (FIG. 6 (a)). At this time, the laminated body 100 was arrange | positioned so that a front plate (1st optical member 10) may be upper side. Then, the two mounting tables 501 and 502 are rotated 90 degrees upward with the position P1 and the position P2 as the center of the rotation axis, and a bending force is applied to the region of the laminate 100 corresponding to the gap C of the mounting table. (FIG. 6 (b)). Thereafter, the two mounting tables 501 and 502 were returned to their original positions (Fig. 6 (a)). The above series of operations were completed, and the number of times the bending force was added was counted once. The number of times that the bending force is added is repeated to confirm the presence or absence of bubbles or cracks in the region of the laminate 100 corresponding to the gap C of the mounting tables 501 and 502. The addition of the bending force was stopped at, and evaluation was performed according to the following criteria. Table 1 shows the results of the evaluation. The moving speeds of the mounting tables 501 and 502 and the added face of the bending force were the same conditions in the evaluation test for any laminate.

A: Bubbles and cracks did not occur even if the number of times the bending force was added reached 10,000.

B: Bubbles or cracks occurred when the number of times of bending force was added more than 0.70,000 to less than 10,000.

C: Bubble or a crack generate | occur | produced when the number of times of the bending force addition was 0.50,000 or more and less than 0.70,000,

D: Bubble or a crack generate | occur | produced when the frequency | count of addition of the bending force was 0.20,000 or more and less than 0.50,000.

E: Bubble or a crack generate | occur | produced when the frequency | count of addition of the force of bending was less than 0.20,000.

<Preparation of the composition for coloring layer formation (black)>

[Ink component]

Acetylene black 15 mass%

75 mass% of polyester

Glutaric acid dimethyl ester 2.5% by mass

2 mass% succinic acid

Isophorone 5.5 mass%

[Hardener]

75% by mass of aliphatic polyisocyanate

25% by mass of ethyl acetate

[menstruum]

Isophorone

[Method of Preparation]

10 mass parts of hardening | curing agents and 10 mass parts of solvent were added with respect to 100 mass parts of ink components, and it stirred, and obtained the composition for colored layer formation (black).

<Preparation of the composition (white) for colored layer formation>

[Ink component]

Titanium dioxide 50% by mass

39 mass% of polyester

Glutaric acid dimethyl ester 2.5% by mass

2 mass% succinic acid

Isophorone 6.5 mass%

[Hardener]

75% by mass of aliphatic polyisocyanate

25% by mass of ethyl acetate

[menstruum]

Isophorone

[Method of Preparation]

10 mass parts of hardening | curing agents and 10 mass parts of solvent were added with respect to 100 mass parts of ink components, and it stirred, and obtained the composition for colorant containing layer formation (white).

<1st optical member>

[First Optical Member A]

Front plate with hard coat layer formed on both sides of base film: thickness 70㎛, modulus of elasticity 3457MPa, length 177mm × 105mm in width

Base film: 50 micrometers in thickness, polyimide (PI) system resin film

Hard coat layer: a layer formed of a composition containing a dendrimer compound having a thickness of 10 μm and a polyfunctional acrylic group at the terminal

[First Optical Member B]

Glass plate: thickness 70㎛, modulus of elasticity 68,000MPa, SCHOTT

[First Optical Member C]

Front plate with a hard coat layer formed on one side of the base film: thickness 50㎛, modulus of elasticity 4091MPa

Base film: thickness 40 micrometers, a triacetyl cellulose resin film

Hard coat layer: 10 μm thick

<2nd optical member>

[Second optical member A]

Triacetyl cellulose resin film (TAC): thickness 25㎛, elastic modulus 3282MPa, Konica Minolta

[Second optical member B]

Polyimide Resin Film (PI): Thickness 25㎛, Modulus of Elasticity 3900MPa, WON IMC

[Second optical member C]

Triacetyl cellulose resin film (TAC): thickness 60㎛, elastic modulus 3282MPa, Konica Minolta

[Second optical member D]

Laminated body in which TAC / polarizer / retardation film / touch sensor panel is laminated in this order, thickness 102.5 μm, length 177 mm × 105 mm

TAC: thickness 25㎛, modulus of elasticity 3282MPa, Konica Minolta

Polarizer: thickness 2.5㎛, modulus of elasticity 937MPa

Retardation film: 17 micrometers in thickness, laminated constitution: Overcoat layer (cured layer of acrylic resin composition, thickness 1 micrometer, elasticity modulus 4,510 MPa) / adhesive layer (thickness 5 micrometers, elastic modulus 0.11 MPa) / layer and the orientation film which the liquid crystal compound hardened | cured Λ / 4 plate (thickness 3 μm, elastic modulus 1,624 MPa) / adhesive layer (thickness 5 μm, elastic modulus 0.11 MPa) / positive C plate (layer 3 μm, elastic modulus 2,039 MPa) Adhesive layer (thickness 25㎛, elastic modulus 0.63MPa)

Touch sensor panel: 33 micrometers in thickness, laminated constitution: Touch sensor pattern (lamination body of ITO and hardened layer of acrylic resin composition, thickness 7 micrometers, elastic modulus 4,510 MPa) / adhesive layer (3 micrometers in thickness, elastic modulus 12,309 MPa) / annular Olefin-based resin film (thickness 23㎛, elastic modulus 1,785MPa)

The 2nd optical member D was produced as follows. First, after forming a photo-alignment film in a base material, the composition containing a dichroic dye and a polymeric liquid crystal compound was apply | coated to a base material, and it oriented and hardened and obtained the polarizer of thickness 2micrometer. The 25-micrometer-thick triacetyl cellulose (TAC) film was bonded together on the said polarizer through the adhesive bond layer. The base material was peeled off and formed on the exposed surface by making the cured layer of the acrylic resin composition whose thickness is 1 micrometer into an overcoat layer. Furthermore, the retardation film (lambda / 4 plate (3 micrometers in thickness) / adhesive layer which consists of a layer which the liquid crystal compound hardened | cured, and an orientation film | membrane) containing the layer which the liquid crystal compound superposed | polymerized and hardened | cured through the adhesive layer of thickness 5 micrometers The positive C plate (3 micrometers in thickness) which consists of a layer which the thickness 5 micrometers) / liquid crystal compound hardened | cured, and an oriented film) was bonded together. Next, the touch sensor panel was bonded to the surface of the retardation film side through the adhesive layer, and the 2nd optical member D was obtained.

[Second optical member E]

2nd optical member D / adhesive layer / PI1 / adhesive layer / PI2 laminated | stacked in this order.

PI1: polyimide resin film (PI), thickness 38㎛, elastic modulus 4,865MPa, Kolon

PI2: polyimide resin film (PI), thickness 50㎛, modulus of elasticity 5,800MPa, Kolon

PI1 was bonded together through the adhesive layer on the surface of the touch sensor panel side of the 2nd optical member D obtained as mentioned above. As an adhesive layer, what was 25 micrometers in thickness and having a storage elastic modulus of 0.63 MPa was used. Then, PI2 was bonded together on the surface of the PI1 side through the same adhesive layer, and the 2nd optical member E was obtained.

[Second optical member F]

Glass plate: thickness 70㎛, modulus of elasticity 68,000MPa, SCHOTT

[Second optical member G]

Triacetyl cellulose resin film (TAC): thickness 40㎛, elastic modulus 3282MPa, Konica Minolta

<Bonding layer>

(Meth) acrylic adhesive layer, thickness 25㎛, length 177mm X 105mm in width

<Example 1>

The coating thickness after drying becomes 3 micrometers by screen printing on the surface of a front plate (1st optical member A) using the coloring agent containing layer formation composition (black) prepared above as ink, and using a screen of 460 mesh. The discharge amount was printed twice, and a black printed layer having a thickness of 6 µm and a width of 5 mm was formed around the entire circumference portion. In the same area | region as the black printing layer, the printing of the discharge amount which becomes 5 micrometers of coating thickness after drying was repeated 3 times by screen printing using the coloring layer formation composition (white) prepared above as ink.

The corona treatment was performed to the bonding surface with the bonding layer of TAC (2nd optical member A), and the bonding surface with TAC of a bonding layer. And TAC and the adhesive layer were bonded together, and TAC with a bonding layer was obtained.

Thereafter, the front plate and the TAC with the bonding layer are laminated so that the surface where the colored layer of the front plate is formed and the surface of the bonding layer of the TAC with the adhesive layer are subjected to corona treatment, and the surface subjected to the corona treatment is inside. It bonded together using the roll bonding machine, cured by autoclave, and obtained the laminated body of Example 1. About the obtained laminated body, the step difference measurement, the reflection image evaluation, and the flexibility test were done. The results are shown in Table 1.

<Example 2>

Except having used the 2nd optical member A in Example 1, the operation similar to Example 1 was performed except having used the 2nd optical member B, and the laminated body of Example 2 was produced. The results are shown in Table 1.

<Example 3>

Except having used the 2nd optical member A in Example 1, except having used the 2nd optical member C, operation similar to Example 1 was performed and the laminated body of Example 3 was produced. The results are shown in Table 1.

<Example 4>

Except having used the 2nd optical member A in Example 1, except having used the 2nd optical member D, operation similar to Example 1 was performed and the laminated body of Example 4 was produced. The results are shown in Table 1.

<Example 5>

In Example 1, operation similar to Example 1 was performed except having used the 1st optical member B and the 2nd optical member E instead of using the 1st optical member A and the 2nd optical member A. The laminated body was produced. However, no flexibility test was performed. The results are shown in Table 1.

<Example 6>

In the same manner as in Example 1, except that the first optical member C was used instead of using the first optical member A, and no printing was performed using the composition for forming a colored layer (white) as ink. Was operated to produce the laminate of Example 6. The results are shown in Table 1.

<Example 7>

The laminated body of Example 7 was produced like Example 6 except having used the 2nd optical member G instead of using the 2nd optical member A in Example 6. The results are shown in Table 1.

<Comparative Example 1>

Except having used the 2nd optical member A in Example 1, except having used the 2nd optical member E, operation similar to Example 1 was performed and the laminated body of the comparative example 1 was produced. The results are shown in Table 1.

<Comparative Example 2>

Except having used the 2nd optical member A in Example 1, except having used the 2nd optical member F, operation similar to Example 1 was performed and the laminated body of the comparative example 2 was produced. However, no flexibility test was performed. The results are shown in Table 1.

<Example 8>

The corona treatment was performed to the bonding surface with the bonding layer of the front plate (1st optical member A), and the bonding surface with the front plate of the bonding layer. And the front plate and the adhesive layer were bonded together, and the front plate with a bonding layer was obtained.

The discharge amount which the coating thickness after drying becomes 3 micrometers by screen printing on the surface of TAC (2nd optical member A) using the coloring agent containing layer formation composition (black) prepared above as ink, and using the screen of 460 mesh. Was printed twice, and a black printed layer having a thickness of 6 µm and a width of 5 mm was formed around the entire circumference portion. In the same area | region as the black printing layer, the printing of the discharge amount which becomes 5 micrometers of coating thickness after drying was repeated 3 times by screen printing using the coloring layer formation composition (white) prepared above as ink.

Then, the corona treatment is given to the surface of the bonding layer of the front plate with an adhesive layer, and the surface in which the colored layer of TAC is formed, and the front plate with a bonding layer is laminated | stacked so that the surface which corona-treated was inside may be inside. It bonded together using the roll bonding machine and cured in the autoclave, and obtained the laminated body of Example 8. About the obtained laminated body, the step difference measurement, the reflection image evaluation, and the flexibility test were done. The results are shown in Table 2.

<Example 9>

The laminated body of Example 9 was produced like Example 8 except having used the 2nd optical member B instead of using the 2nd optical member A. In FIG. The results are shown in Table 2.

<Example 10>

Except having used the 2nd optical member A in Example 8, except having used the 2nd optical member C, operation similar to Example 8 was performed and the laminated body of Example 10 was produced. The results are shown in Table 2.

<Example 11>

Except having used the 2nd optical member A in Example 8, except having used the 2nd optical member D, operation similar to Example 8 was performed and the laminated body of Example 11 was produced. The results are shown in Table 2.

<Example 12>

In Example 8, operation similar to Example 8 was performed except having used the 1st optical member B and the 2nd optical member E instead of using the 1st optical member A and the 2nd optical member A, and of Example 12. The laminated body was produced. However, no flexibility test was performed. The results are shown in Table 2.

<Comparative Example 3>

Except having used the 2nd optical member A in Example 8, except having used the 2nd optical member E, operation similar to Example 8 was performed and the laminated body of the comparative example 3 was produced. The results are shown in Table 2.

<Comparative Example 4>

Except having used the 2nd optical member A in Example 8, except having used the 2nd optical member F, operation similar to Example 8 was performed and the laminated body of the comparative example 4 was produced. However, no flexibility test was performed. The results are shown in Table 2.

TABLE 1

TABLE 2

10: first optical member
11: front panel
12: glass plate
20: bonding layer
30: second optical member
31, 35, 36: plate body
32: polarizer
33: retardation film
34: touch sensor panel
40: colored layer
100 to 103 laminated body
501, 502

Claims (7)

As a laminated body provided with the 1st optical member comprised by at least 1 layer, the bonding layer, and the 2nd optical member comprised by at least 1 layer in this order,
Further provided with the colored layer formed in part on the surface of the bonding layer side of a said 1st optical member or a 2nd optical member,
The said 1st optical member is arrange | positioned rather than the said 2nd optical member at the visual recognition side of a laminated body,
A laminate which satisfies the following formula (1):
S _Pa > S _Pb (1)
[In the meal,
S _Pa represents the total of the product 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 total of the product P _b of the elastic modulus E _b and the thickness t _b of each layer constituting the second optical member.]. The method of claim 1,
The first optical member is a front plate, and the front plate includes a resin film. The method according to claim 1 or 2,
The second optical member is a laminate comprising at least one selected from the group consisting of a touch sensor panel and a polarizing plate. The method according to claim 1 or 2,
The said colored layer is a laminated body partially formed on the surface of the bonding layer side of a 2nd optical member. The method according to claim 1 or 2,
The laminated body whose thickness of the said colored layer is 0.1 micrometer or more and 30 micrometers or less. The display device containing the laminated body of Claim 1 or 2. As a manufacturing method of the laminated body of Claim 1 or 2,
A preparation 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,
And a bonding step of bonding the first optical member and the second optical member together via a bonding layer.

Images