KR20210102244A - Laminate and image display device using same - Google Patents

Abstract

When the laminated body containing a touch sensor is included in a flexible image display apparatus, when an external impact is applied, a crack may generate|occur|produce in a touch sensor. It is an object of the present invention to provide a laminate including a touch sensor which is very thin and has excellent impact resistance, an image display device provided with the laminate, and a method for manufacturing the laminate. A laminate comprising a touch sensor and a support formed on at least one surface of the touch sensor, wherein the support has a pattern structure.

Description

Laminate and image display device using same

The present invention relates to a laminate and an image display device using the same.

DESCRIPTION OF RELATED ART In recent years, the spread of a mobile phone, a tablet terminal, etc. advanced, and the liquid crystal display device and organic electroluminescent display (OLED) were used widely as an image display apparatus. Among these, the image display apparatuses which have a touch panel function especially are increasing. However, when such an image display device has flexibility, it is thin, and it is calculated|required that a bending characteristic is favorable for the film to be used, and it is no exception also about a touch sensor (patent document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2018-59069

Such a flexible touch sensor is weak to impact, and for example, even when included in an image display device, when an external shock is applied to the display surface of the image display device so that the touch pen falls with the pen tip, the touch sensor It turns out that there are cases where cracks occur in the .

The present invention has been made in order to solve the above conventional problems, and its main object is a very thin laminate including a touch sensor having excellent impact resistance, an image display device including the laminate, and the laminate It is to provide a manufacturing method.

That is, this invention provides the following laminated body, an image display apparatus, and the manufacturing method of the said laminated body.

[1] A laminate comprising a touch sensor and a support formed on at least one surface of the touch sensor, wherein the support has a pattern structure.

[2] The laminate according to [1], wherein the support has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a Rahmen structure, a stripe structure, and a circular structure.

[3] The laminate according to [1] or [2], wherein the support has a thickness of 1 µm to 15 µm.

[4] The laminate according to any one of [1] to [3], wherein the width of the support in a plan view is 500 µm to 3000 µm.

[5] The laminate according to any one of [1] to [4], wherein the support has optical isotropy.

[6] The laminate according to any one of [1] to [5], wherein an embedding resin layer for embedding the support is provided on the one surface of the touch sensor.

[7] The laminate according to any one of [1] to [6], wherein the support has a compressive elastic modulus at 23°C of 0.01 GPa to 8.0 GPa.

[8] The laminate according to any one of [1] to [7], and a laminate having a circularly polarizing plate.

[9] An image display device comprising the laminate according to any one of [1] to [8].

[10] A method for producing a laminate, comprising: forming a pattern of a resin material on at least one surface of a touch sensor; and curing the resin material to form a support having a pattern structure.

ADVANTAGE OF THE INVENTION According to this invention, the laminated body containing the touch sensor which is very thin and has the outstanding impact resistance, the image display apparatus provided with the said laminated body, and the manufacturing method of the said laminated body can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view of the laminated body which concerns on one Embodiment of this invention.
It is sectional drawing of the laminated body which concerns on one Embodiment of this invention.
It is a top view of the laminated body which concerns on another embodiment of this invention.
It is a top view of the laminated body which concerns on another embodiment of this invention.
It is a top view of the laminated body which concerns on another embodiment of this invention.
It is a top view of the laminated body which concerns on another embodiment of this invention.
7 is a cross-sectional view of a laminate according to still another embodiment of the present invention.
8 is a cross-sectional view of a laminate according to still another embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, although preferred embodiment of this invention is described, this invention is not restrict|limited to this embodiment.

(Definition of terms and symbols)

Definitions of terms and symbols in this specification are as follows.

(1) refractive index (nx, ny, nz)

"nx" is the refractive index in the direction (ie, slow axis direction) in which the in-plane refractive index is maximum, "ny" is the direction orthogonal to the slow axis in the plane, and "nz" is the refractive index in the thickness direction.

(2) In-plane phase difference value

The in-plane retardation value Re(λ) refers to the in-plane retardation value of the film at 23°C and a wavelength λ(nm). Re(λ) is calculated by Re(λ)=(nx-ny)×d when the thickness of the film is d(nm).

(3) Phase difference value in the thickness direction

The in-plane retardation value Rth(λ) refers to a retardation value in the thickness direction of the film at 23°C and a wavelength λ(nm). Rth(λ) is calculated by Rth(λ)=((nx+ny)/2-nz)×d when the thickness of the film is d(nm).

(Organization of the entire floor)

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view of the laminated body by one Embodiment of this invention. 2 : is sectional drawing of the laminated body by one Embodiment of this invention. As shown in FIG. 2 , the laminate 10 has a touch sensor 1 and a support body 2 formed on one surface of the touch sensor 1 . Sheet shape may be sufficient as the laminated body 10, and elongate shape may be sufficient as it. The thickness excluding the substrate of the touch sensor is typically 15 µm or less. The thickness of the support body 2 is typically 1 µm to 15 µm, and the width of the support body 2 in plan view is typically 500 µm to 3000 µm. The support 2 is preferably transparent, more preferably transparent and substantially optically isotropic. The support body 2 has a pattern structure, and typically has a honeycomb structure shown in FIG. 1 as a pattern structure.

When the touch sensor 1 includes a substrate and a sensing pattern as described below, the support 2 is on the surface of the touch sensor 1 on the substrate side, or on the surface of the touch sensor 1 on the sensing pattern side. It may be formed, and it is preferable to be formed on the surface of the sensing pattern side from the viewpoint of impact resistance.

3 to 6 are plan views of a laminate according to another embodiment of the present invention. The support may have a ramen structure shown in FIG. 3, a truss structure shown in FIG. 4, may have a circular structure shown in FIG. 5 (a structure in which circles are arranged in a matrix), or may have a structure shown in FIG. You may have a stripe structure. In this way, when forming the pattern-shaped support 2 on the surface of the touch sensor 1, compared to the case of forming the support on the entire surface of the surface of the touch sensor 1, the amount of material constituting the support can be reduced. can

7 : is sectional drawing of the laminated body by still another embodiment of this invention. As shown in FIG. 7 , the laminate 11 has a support body 2 (hereinafter, sometimes referred to as a first support body 2 ) on one surface of the touch sensor 1 , and the touch sensor 1 . ) has a support body 3 (hereinafter, sometimes referred to as a second support body 3) on the other surface. The second support 3 has a pattern structure. The pattern structure of the second support body 3 may be the same as or different from the pattern structure of the first support body 2 . When the pattern structure of the first support 2 and the pattern structure of the second support 3 are the same, preferably, as shown in FIG. 7 , the first support 2 and the second support 3 are , arranged so that the area of the overlapping portion becomes smaller in plan view.

8 is a cross-sectional view of a laminate according to still another embodiment of the present invention. As shown in FIG. 8 , the laminate 12 includes an embedding resin layer 4 in which the support 2 is embedded on one surface of the touch sensor 1 . For this reason, the level difference formed by the support body 2 can be smoothed out. In addition, the surface of the touch sensor 1 can be protected by the embedding resin layer 4 covering the exposed part of the touch sensor 1 . Moreover, you may combine two or more said embodiment.

<Touch sensor>

A touch sensor is used as an input means. As the touch sensor, various types such as a resistive film type, a surface acoustic wave type, an infrared type, an electromagnetic induction type, and a capacitive type are proposed, and any type may be used. Among them, the electrostatic capacitive method is preferable. The capacitive touch sensor is divided into an active area and an inactive area located outside the active area. The active area is an area corresponding to an area where a screen is displayed by the display panel (display unit), and is an area in which a user's touch is sensed, and the inactive area is an area corresponding to an area where a screen is not displayed by the display device (non-display unit). . The touch sensor includes: a substrate having flexible characteristics; a sensing pattern formed in the active region of the substrate; Each sensing line may be formed in an inactive region of the substrate and connected to an external driving circuit through the sensing pattern and the pad unit. As a board|substrate which has a flexible characteristic, the material similar to the transparent base material of the window mentioned later can be used. The substrate of the touch sensor preferably has a toughness of 2,000 MPa% or more in view of suppression of cracks in the touch sensor. More preferably, the toughness may be 2,000 MPa% to 30,000 MPa%.

In addition, as a touch sensor, it may be used which does not have a board|substrate but includes each sensing line for connecting with an external driving circuit via a sensing pattern and a pad part. Such a touch sensor can be obtained by peeling from a board|substrate, after producing said each layer on a glass substrate or the board|substrate which has the said flexible characteristic.

The sensing pattern may include a first pattern formed in a first direction and a second pattern formed in a second direction. The first pattern and the second pattern are arranged in different directions. The first pattern and the second pattern are formed on the same layer and in order to sense a touched point, each pattern must be electrically connected. In the first pattern, each unit pattern is connected to each other through a seam, but in the second pattern, each unit pattern is separated from each other in an island form, so a separate bridge electrode is required to electrically connect the second pattern. necessary. As the sensing pattern, a known transparent electrode material may be applied. For example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), cadmium tin oxide (CTO), PEDOT (poly(3,4-ethylenedioxythiophene)) , carbon nanotubes (CNT), graphene, and metal wires, and these may be used alone or in combination of two or more. Preferably, ITO can be used. The metal used for the metal wire is not particularly limited, and examples thereof include silver, gold, aluminum, copper, iron, nickel, titanium, tellurium, and chromium. These can be used individually or in mixture of 2 or more types.

The bridge electrode may be formed on the insulating layer by interposing an insulating layer on the sensing pattern, so that the bridge electrode is formed on the substrate, and the insulating layer and the sensing pattern may be formed thereon. The bridge electrode may be formed of the same material as the sensing pattern, or may be formed of a metal such as molybdenum, silver, aluminum, copper, palladium, gold, platinum, zinc, tin, titanium, or an alloy of two or more thereof. Since the first pattern and the second pattern must be electrically insulated, an insulating layer is formed between the sensing pattern and the bridge electrode. The insulating layer may be formed only between the seam of the first pattern and the bridge electrode, or may be formed in the structure of a layer covering the sensing pattern. In the latter case, the bridge electrode may connect the second pattern through a contact hole formed in the insulating layer. The touch sensor is a means for appropriately compensating for a difference in transmittance caused by a difference in transmittance between a pattern region in which a pattern is formed and a non-pattern region in which a pattern is not formed, specifically, a difference in light transmittance caused by a difference in refractive index in this region. The optical control layer may further include an optical control layer between the substrate and the electrode, and the optical control layer may include an inorganic insulating material or an organic insulating material. The optical control layer may be formed by coating a photocurable composition including a photocurable organic binder and a solvent on a substrate. The photocurable composition may further include inorganic particles. The refractive index of the optical control layer may be increased by the inorganic particles.

The photocurable organic binder may include, for example, a copolymer of each monomer such as an acrylate-based monomer, a styrene-based monomer, or a carboxylic acid-based monomer. The photocurable organic binder may be, for example, a copolymer containing different repeating units, such as an epoxy group-containing repeating unit, an acrylate repeating unit, and a carboxylic acid repeating unit. The inorganic particles may include, for example, zirconia particles, titania particles, alumina particles, and the like. The photocurable composition may further include each additive such as a photoinitiator, a polymerizable monomer, and a curing aid.

(support)

The laminate of the present invention has a support on at least one surface of the touch sensor. The support body has a pattern structure as described above. The support preferably has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a ramen structure, a stripe structure, and a circle structure. The support more preferably has a honeycomb structure, a truss structure, or a circular structure, and particularly preferably has a honeycomb structure or a circular structure. When the support has a honeycomb structure, a truss structure, or a circular structure, when the touch sensor is stressed in one direction, the stress may be distributed in a direction different from the above direction, and as a result, the impact from the outside in the touch sensor This is because it can relieve cracks and suppress cracks.

The support is preferably transparent and substantially optically isotropic. In the present specification, "substantially optically isotropic" means, for example, the in-plane retardation Re (550) and the thickness direction retardation Rth (550) of the support are each, preferably 20 nm or less, more preferably 10 nm or less.

When the pattern structure of the first support formed on one surface of the touch sensor and the pattern structure of the second support formed on the other surface of the touch sensor are the same, the second support is preferably the first support and It is arranged so that the area of the overlapping part becomes small.

As mentioned above, the thickness of a support body becomes like this. Preferably they are 1 micrometer - 15 micrometers, More preferably, they are 3 micrometers - 8 micrometers. The ratio (t2/t1) of the thickness t2 of the support to the thickness t1 of the touch sensor excluding the substrate is preferably 0.13 to 5.00, more preferably 0.38 to 4.00, still more preferably 0.63 ~3.33.

The compressive elastic modulus in 23 degreeC of a support body becomes like this. Preferably it is 0.01 GPa - 8.0 GPa, More preferably, it is 0.02 GPa - 6.0 GPa. For this reason, while suppressing the crack due to the external impact of the touch sensor, it is possible to increase the workability and flexibility of the touch sensor. The compressive elastic modulus can be measured according to the nanoindentation method.

The support body can be formed with any suitable material and method as long as it satisfies the above configuration and has sufficient adhesiveness with the touch sensor. Adhesiveness of the support body with respect to a touch sensor can be evaluated according to the checkerboard peeling test of JISK5400. As for the adhesiveness of the support body with respect to a polymeric liquid crystal film, Preferably, the peeling number is 0 in the said checkerboard peeling test (the number of board|substrate graduations: 100 pieces).

In one embodiment, the support body having a pattern structure can be formed by forming a resin material or a pattern of a coating liquid containing a resin material on the surface of the touch sensor, and curing (or solidifying) the resin material. In another embodiment, the support can be formed by depositing inorganic oxide such as SiO ₂ on the surface of the touch sensor.

As the resin material, any suitable material can be used as long as the effect of the present invention is obtained. Examples of the resin material include polyester-based resins, polyether-based resins, polycarbonate-based resins, polyurethane-based resins, silicone-based resins, polyamide-based resins, polyimide-based resins, PVA-based resins, and acrylic resins. , an epoxy resin, and a fluorine resin. These may be used independently and may be used in combination (for example, blending, copolymerization).

A method of forming the pattern of the resin material or the coating solution on the surface of the touch sensor is not particularly limited. As said method, printing, photolithography, inkjet, a nozzle, die application|coating etc. are mentioned, for example. The pattern of the resin material or the coating solution is preferably formed by printing. As a method of printing the coating liquid in a pattern state, an iron plate printing method, a direct gravure printing method, an intaglio printing method, a lithographic printing method, a stencil printing method, etc. are mentioned. The coating liquid may contain other suitable components other than the above resin material as long as the effects of the present invention are not impaired. Such other components include, for example, resin components other than the above resin materials as main components, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, thin materials, softeners, antioxidants, conductive agents , ultraviolet absorbers, antioxidants, light stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat-resistant stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, and the like.

Conditions for curing (or solidifying) the resin material (coating solution) may be appropriately set according to the type of the resin material and the composition of the composition. For example, the resin material can be cured (or solidified) by drying, active energy ray curing, heat curing, or the like.

(embedded resin layer)

The embedding resin layer embeds the support body formed in one surface of a touch sensor as mentioned above. The thickness of the embedding resin layer is thicker than the thickness of the support, preferably 3 µm to 150 µm, and more preferably 5 µm to 100 µm. The embedding resin layer may be any suitable functional layer formed according to the characteristics required for the touch sensor. As said functional layer, a hard-coat layer, an adhesive layer, a transparent optical adhesive layer, etc. are mentioned, for example. When the embedding resin layer is a hard coat layer, the thickness is, for example, 5 µm to 15 µm, and when the embedding resin layer is an adhesive layer, the thickness is, for example, 5 µm to 30 µm, and the embedding resin layer is transparent. In the case of an optical adhesive layer, the thickness is 25 micrometers - 125 micrometers, for example. The embedding resin layer is preferably transparent and substantially optically isotropic.

The embedding resin layer can be formed of any suitable material and method as long as it has sufficient adhesion to the touch sensor and the support. In one embodiment, the embedding resin layer can be formed of a resin material of a different type from that of the support. An embedding resin layer can be formed by forming a resin layer on the surface of a touch sensor so that a support body may be embedded, and hardening a resin layer.

A method of forming the resin layer on the surface of the touch sensor is not particularly limited. In one embodiment, a resin layer can be formed by apply|coating the coating liquid containing a resin material to the surface of a touch sensor. As a coating method, any suitable application|coating method can be used. Specific examples include a curtain coating method, a dip coating method, a spin coating method, a print coating method, a spray coating method, a slot coating method, a roll coating method, a slide coating method, a blade coating method, a gravure coating method, and a wire bar method. have. Curing conditions may be appropriately set according to the type of resin material to be used, the composition of the composition, and the like. The coating liquid may contain other suitable components other than the above resin material as long as the effects of the present invention are not impaired. Such other components include, for example, resin components other than the above resin materials as main components, tackifiers, inorganic fillers, organic fillers, metal powders, pigments, thin materials, softeners, anti-aging agents, conductive agents, ultraviolet absorbers, oxidizing agents An inhibitor, a light stabilizer, a surface lubricant, a leveling agent, a corrosion inhibitor, a heat-resistant stabilizer, a polymerization inhibitor, a lubricant, a solvent, a catalyst, etc. are mentioned.

The laminate of this invention is good also as the form which laminated|stacked other arbitrary functional layers. For example, a function may be further provided by laminating a circular polarizing plate or a window film on the touch sensor. These layers may be laminated to each other via an adhesive or pressure-sensitive adhesive, which will be described later.

<Image display device>

The image display apparatus of this invention has the laminated body of this invention, It is characterized by the above-mentioned.

A well-known thing can be used irrespective of a kind as an image display apparatus. For example, the laminate of the present invention can be optimally used for an organic EL display device. For example, it can be optimally used as an antireflection polarizing plate of a flexible organic electroluminescent display apparatus.

<Flexible image display device>

A flexible image display device consists of a laminate for a flexible image display device and an organic EL display panel, and the laminate for a flexible image display device is arranged on the viewer side with respect to the organic EL display panel so as to be bendable. As the laminate for a flexible image display device, it is added to the laminate of the present invention and may contain a window and a circularly polarizing plate, and such a laminated order is arbitrary, but from the viewer side, a window, a circularly polarizing plate, the laminate of the present invention or It is preferable to laminate|stack in order of a window, the laminated body of this invention, and a circularly polarizing plate. When a circularly polarizing plate exists on the visual recognition side of the laminated body of this invention, since it becomes difficult to visually recognize the pattern of a touch sensor, and the visibility of a display image improves, it is preferable. Each member may be laminated using an adhesive, an adhesive, or the like. In addition, the window, the circularly polarizing plate, and a light-shielding pattern formed on at least one surface of any one layer of the laminate of the present invention may be provided.

<Window>

The window is disposed on the viewing side of the flexible image display device, and plays a role of protecting other components from external impact or environmental changes such as temperature and humidity. A window in the flexible image display device may have a flexible characteristic. The said window consists of a flexible transparent base material, and may contain the hard-coat layer in at least one surface.

The transparent substrate used for the window has a visible light transmittance of 70% or more, preferably 80% or more. The transparent substrate may be formed of glass or a polymer film. The transparent substrate is preferably formed of a polymer film. Specifically, polyolefins such as polyethylene, polypropylene, polymethylpentene, norbornene, or cycloolefin derivatives having a monomer unit containing cycloolefin, diacetyl cellulose, triacetyl cellulose, propionyl cellulose ( Modified) Cellulose, acrylics such as methyl methacrylate (co)polymer, polystyrene such as styrene (co)polymer, acrylonitrile/butadiene/styrene copolymer, acrylonitrile/styrene copolymer, ethylene vinyl acetate copolymer Polyesters such as retention, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyarylate, polyamides such as nylon, and polyimides , polyamideimides, polyetherimides, polyether sulfones, polysulfones, polyvinyl alcohols, polyvinyl acetals, polyurethanes, epoxy resins, etc. Alternatively, a biaxially oriented film may be used. Each of these polymers may be used alone or in combination of two or more. Preferably, among the transparent substrates described above, a polyamide film, a polyamideimide film or a polyimide film, a polyester film, an olefin film, an acrylic film, and a cellulose film, which are excellent in transparency and heat resistance, are preferable. In the polymer film, it is also preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles, and the like. In addition, colorants such as pigments or dyes, optical brighteners, dispersants, plasticizers, heat stabilizers, light stabilizers, infrared absorbers, ultraviolet absorbers, antistatic agents, antioxidants, lubricants, and solvents may be incorporated. The thickness of the transparent substrate is 5 to 200 μm, preferably 20 to 100 μm.

The window may be provided with a hard coat layer on at least one surface of the transparent substrate. The thickness in particular of a hard-coat layer is not restrict|limited, For example, 2-100 micrometers may be sufficient.

When the thickness of the said hard-coat layer is less than 2 micrometers, it is difficult to ensure sufficient abrasion resistance, and when it exceeds 100 micrometers, flex resistance may fall and the problem of curl generation by cure shrinkage may arise.

The hard coat layer can be formed by curing a hard coat composition containing a reactive material that forms a crosslinked structure by irradiating active energy ray or thermal energy, but is preferably cured by active energy ray. An active energy ray is defined as an energy ray capable of generating an active species by decomposing a compound that generates an active species. Examples of active energy rays include visible light, ultraviolet rays, infrared rays, X-rays, α-rays, β-rays, γ-rays, and electron beams. Ultraviolet light is particularly preferred. The said hard-coat composition contains the at least 1 sort(s) of polymer of a radically polymerizable compound and a cationically polymerizable compound.

The said radically polymerizable compound is a compound which has a radically polymerizable group. The radically polymerizable group of the radically polymerizable compound may be any functional group capable of causing a radical polymerization reaction, and examples thereof include a group containing a carbon-carbon unsaturated double bond. Specifically, a vinyl group, a (meth)acryloyl group, etc. are mentioned. Moreover, when the said radically polymerizable compound has two or more radically polymerizable groups, these radically polymerizable groups may be respectively same or different. It is preferable that the number of the radically polymerizable groups which the said radically polymerizable compound has in 1 molecule improves the hardness of a hard-coat layer that it is 2 or more. As the radical polymerizable compound, a compound having a (meth)acryloyl group is preferable from the viewpoint of high reactivity, and it is a polyfunctional acrylate monomer having 2 to 6 (meth)acryloyl groups in one molecule. Preferred are oligomers having several (meth)acryloyl groups in the molecule called compounds or epoxy (meth)acrylates, urethane (meth)acrylates, and polyester (meth)acrylates having a molecular weight of several hundred to several thousand. Can be used. It is preferable to include at least one selected from epoxy (meth)acrylate, urethane (meth)acrylate and polyester (meth)acrylate.

The said cationically polymerizable compound is a compound which has cationically polymerizable groups, such as an epoxy group, an oxetanyl group, and a vinyl ether group. It is preferable that the number of the cationically polymerizable groups which the said cationically polymerizable compound has in 1 molecule is 2 or more from a point which improves the hardness of a hard-coat layer, and it is also preferable that it is 3 or more. Moreover, as said cationically polymerizable compound, the compound which has at least 1 sort(s) of an epoxy group and an oxetanyl group as a cationically polymerizable group is especially preferable. Cyclic ether groups, such as an epoxy group and an oxetanyl group, are preferable at the point which shrinkage|contraction accompanying a polymerization reaction is small. Moreover, the compound which has an epoxy group of a cyclic ether group has the advantage that it is easy to obtain the compound of various structures, does not exert a bad influence on the durability of the obtained hard-coat layer, Compatibility with a radically polymerizable compound is also easy to control. In addition, the oxetanyl group in the cyclic ether group tends to have a higher polymerization degree compared to the epoxy group, is low in toxicity, and speeds up the network formation rate obtained from the cationically polymerizable compound of the obtained hard coat layer, even in the region where it is mixed with the radically polymerizable compound There are advantages such as forming an independent network without leaving unreacted monomers in the film.

As a cationically polymerizable compound having an epoxy group, for example, a polyglycidyl ether of a polyhydric alcohol having an alicyclic ring or a compound containing a cyclohexene ring or a cyclopentene ring is epoxidized with an appropriate oxidizing agent such as hydrogen peroxide or peracid. alicyclic epoxy resin obtained by Aliphatic epoxy resins, such as polyglycidyl ether of an aliphatic polyhydric alcohol or its alkylene oxide adduct, polyglycidyl ester of an aliphatic long-chain polybasic acid, a homopolymer of glycidyl (meth)acrylate, a copolymer; Glycidyl ether produced by reaction of epichlorohydrin with bisphenols such as bisphenol A, bisphenol F and hydrogenated bisphenol A, or derivatives such as alkylene oxide adducts and caprolactone adducts thereof, and furnace It is a rock epoxy resin, etc., and the glycidyl ether type epoxy resin derived from bisphenol, etc. are mentioned.

The hard coat composition may further include a polymerization initiator. Examples of the polymerization initiator include a radical polymerization initiator, a cationic polymerization initiator, a radical and a cationic polymerization initiator, and the like, and can be appropriately selected and used. Such a polymerization initiator is decomposed by at least one kind of irradiation with active energy rays and heating, and generates radicals or cations to advance radical polymerization and cationic polymerization.

The radical polymerization initiator should just be able to release the substance which initiates radical polymerization by at least any one of active energy ray irradiation and heating. For example, as a thermal radical polymerization initiator, organic peroxides, such as hydrogen peroxide and perbenzoic acid, Azo compounds, such as azobisbutyronitrile, etc. are mentioned.

As the active energy ray radical polymerization initiator, a Type 1 radical polymerization initiator that generates radicals by decomposition of molecules and a Type 2 type radical polymerization initiator that coexists with a tertiary amine to generate radicals through a hydrogen extraction reaction, each alone or It can also be used in combination.

The cationic polymerization initiator should just be capable of releasing a substance that initiates cationic polymerization by at least any one of irradiation with active energy rays and heating. As a cationic polymerization initiator, an aromatic iodonium salt, an aromatic sulfonium salt, a cyclopentadienyl iron(II) complex, etc. can be used. They can initiate cationic polymerization by either or both of active energy ray irradiation or heating according to their different structures. The polymerization initiator may include 0.1 to 10% by weight based on 100% by weight of the total hard coat composition. When the content of the polymerization initiator is less than 0.1% by weight, curing does not proceed sufficiently, and it is difficult to implement mechanical properties or adhesion of the finally obtained coating film, and when it exceeds 10% by weight, poor adhesion due to curing shrinkage A cracking phenomenon and a curling phenomenon may occur.

The hard coat composition may further include one or more selected from the group consisting of a solvent and an additive. The solvent, which can dissolve or disperse the polymerizable compound and the polymerization initiator, can be used without limitation as long as it is known as a solvent for a hard coat composition in the art. The additive may further include inorganic particles, a leveling agent, a stabilizer, a surfactant, an antistatic agent, a lubricant, an antifouling agent, and the like.

Each layer (a window, a circularly polarizing plate, the laminated body of this invention) which forms the said laminated body for flexible image display apparatuses can be laminated|stacked with an adhesive agent. As adhesives, water-based adhesives, organic solvent-based adhesives, solvent-free adhesives, solid adhesives, solvent volatilization adhesives, moisture curing adhesives, heat curing adhesives, anaerobic curing adhesives, active energy ray curing adhesives, curing agent mixed adhesives, heat melting adhesives, pressure-sensitive adhesives What is used for general purposes, such as a type adhesive (adhesive) and a re-moistening type adhesive, can be used. Among them, water-based solvent volatilization adhesives, active energy ray curing adhesives, and pressure-sensitive adhesives are frequently used. The thickness of the adhesive layer can be appropriately adjusted according to the required adhesive force, etc., and is 0.01 μm to 500 μm, preferably 0.1 μm to 300 μm. , may be different.

As the water-based solvent volatilization adhesive, a water-dispersed polymer such as a polyvinyl alcohol-based polymer and a water-soluble polymer such as starch, an ethylene-vinyl acetate emulsion, or a styrene-butadiene emulsion can be used as the main polymer. In addition to water and the main polymer, a crosslinking agent, a silane compound, an ionic compound, a crosslinking catalyst, an antioxidant, a dye, a pigment, an inorganic filler, an organic solvent, and the like may be blended. When adhere|attaching with the said water-based solvent volatilization type adhesive agent, adhesiveness can be provided by injecting|pouring the said water-based solvent volatilization type adhesive agent between to-be-adhesive layers and bonding to-be-adhered layers, by drying. The thickness of the adhesive layer in the case of using the said water-based solvent volatilization adhesive agent is 0.01-10 micrometers, Preferably 0.1-1 micrometer may be sufficient. When using the said water-system solvent volatilization type adhesive agent in multiple layers, the thickness kind of each layer may be same or different.

The active energy ray-curable adhesive may be formed by curing an active energy ray-curable composition comprising a reactive material that forms an adhesive layer by irradiating an active energy ray. The said active energy ray hardening composition can contain the at least 1 sort(s) of polymer of a radically polymerizable compound similar to a hard-coat composition, and a cationically polymerizable compound. The said radically polymerizable compound is the same as that of a hard-coat composition, The thing of the same kind as a hard-coat composition can be used. As a radically polymerizable compound used for an adhesive layer, the compound which has an acryloyl group is preferable. In order to lower a viscosity as an adhesive composition, it is also preferable to contain a monofunctional compound.

The said cationically polymerizable compound is the same as that of a hard-coat composition, The thing similar to a hard-coat composition can be used. As a cationically polymerizable compound used for an active energy ray hardening composition, an epoxy compound is especially preferable. It is also preferable to contain a monofunctional compound as a reactive diluent in order to lower a viscosity as an adhesive composition.

The active energy ray composition may further include a polymerization initiator. Examples of the polymerization initiator include a radical polymerization initiator, a cationic polymerization initiator, a radical and a cationic polymerization initiator, and the like, and can be appropriately selected and used. Such a polymerization initiator is decomposed by at least one kind of irradiation with active energy rays and heating, and generates radicals or cations to advance radical polymerization and cationic polymerization. Among those described in the hard coat composition, an initiator capable of initiating at least either radical polymerization or cationic polymerization by irradiation with an active energy ray can be used.

The active energy ray curing composition may also include an ion trapping agent, an antioxidant, a chain transfer agent, an adhesion imparting agent, a thermoplastic resin, a filler, a flow viscosity modifier, a plasticizer, an antifoaming agent, a solvent, an additive, and a solvent. When bonding with the active energy ray-curable adhesive, the active energy ray curing composition is applied to either or both of the adherend layers and then bonded, and active energy rays are applied through either or both adherend layers. It can adhere|attach by irradiating and hardening. The thickness of the adhesive layer in the case of using the active energy ray-curable adhesive may be 0.01 to 20 µm, preferably 0.1 to 10 µm. When using the said active energy ray hardening-type adhesive agent in multiple layers, the thickness kind of each layer may be same or different.

The pressure-sensitive adhesive is classified into an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and the like depending on the main polymer, and any one may be used. A crosslinking agent, a silane compound, an ionic compound, a crosslinking catalyst, an antioxidant, a tackifier, a plasticizer, dye, a pigment, an inorganic filler, etc. may be mix|blended with an adhesive in addition to a main polymer. Each component constituting the pressure-sensitive adhesive is dissolved and dispersed in a solvent to obtain a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition is applied on a substrate and then dried to form an adhesive layer adhesive layer. The pressure-sensitive adhesive layer may be directly formed or may be transferred separately from the substrate. In order to cover the adhesive surface before adhesion, it is also preferable to use a release film. The thickness of the adhesive layer in the case of using the said active energy ray-curable adhesive agent is 0.1-500 micrometers, Preferably it may be 1-300 micrometers. When using the said adhesive in multiple layers, the thickness kind of each layer may be the same, and may differ.

(shading pattern)

The light blocking pattern may be applied as at least a part of a bezel or a housing of the flexible image display device. By hiding the wiring arranged on the edge of the flexible image display device by the light-shielding pattern and making it difficult to be visually recognized, the visibility of the image is improved. The light-shielding pattern may be in the form of a single layer or a multilayer. The color of the light-shielding pattern is not particularly limited, and has various colors such as black, white, and metallic colors. The light-shielding pattern may be formed of a pigment for realizing a color and a polymer such as an acrylic resin, an ester-based resin, an epoxy-based resin, polyurethane, or silicone. These can also be used individually or in mixture of 2 or more types. The light-shielding pattern can be formed by various methods such as printing, lithography, and inkjet. The thickness of the light-shielding pattern may be 1 µm to 100 µm, preferably 2 µm to 50 µm. Moreover, it is also preferable to provide a shape, such as an inclination, in the thickness direction of an optical pattern.

(Circular Polarizer)

The circularly polarizing plate is a functional layer having a function of transmitting only the right or left circularly polarized component by laminating a λ/4 retardation plate on the linearly polarizing plate. For example, it is used to convert external light into right circularly polarized light, to block the left circularly polarized external light reflected by the organic EL panel, and to transmit only the organic EL light emitting component, thereby suppressing the influence of reflected light and making the image easier to see.

In order to achieve the circular polarization function, the absorption axis of the linear polarizing plate and the slow axis of the λ/4 retardation plate need to be 45° in theory, but 45±10° in practice. The linear polarizing plate and the λ/4 retardation plate do not necessarily need to be stacked adjacent to each other, and the relationship between the absorption axis and the slow axis may satisfy the above-mentioned range. Although it is desirable to achieve perfect circular polarization in the full wavelength field, it is not always necessary for practical use, so the circular polarizer in the present invention includes an elliptically polarizer. It is also preferable to laminate a λ/4 retardation plate on the visual recognition side of the linear polarizing plate and to make the emitted light circularly polarized to improve the visibility in the state in which the polarized sunglasses are worn.

The linear polarizing plate is a functional layer having a function of passing light vibrating in the transmission axis direction, but blocking polarization of a vibration component perpendicular to it. The linear polarizing plate may have a configuration including a linear polarizer alone or a linear polarizer and a protective film affixed on at least one surface thereof. The thickness of the said linear polarizing plate may be 200 micrometers or less, Preferably, it is 0.5 micrometer - 100 micrometers. When thickness exceeds 200 micrometers, flexibility may fall.

The linear polarizer may be a stretched film-type polarizer manufactured by dyeing and stretching a polyvinyl alcohol (PVA)-based film. A dichroic dye such as iodine is adsorbed to a PVA-based film orientated by stretching, or when stretched in a state adsorbed to PVA, the dichroic dye is oriented and polarization performance is exhibited. In manufacture of the said film polarizer, you may have other processes, such as swelling, crosslinking by a boric acid, washing|cleaning by aqueous solution, and drying. The stretching and dyeing steps may be performed alone with the PVA-based film, or may be performed in a laminated state with other films such as polyethylene terephthalate. As a PVA-type film used, 10-100 micrometers and a draw ratio of 2-10 times are preferable.

In addition, another example of the linear polarizer may be a liquid crystal coating type polarizer formed by coating a composition containing a liquid crystal compound. The composition may include a liquid crystal compound and a dichroic dye. The liquid crystal compound should just have a property of showing a liquid crystal state, and in particular, having a higher-order alignment state such as a smectic phase is preferable because high polarization performance can be exhibited. It is also preferable to have a polymerizable group. The dichroic dye is a dye that is aligned with the liquid crystal compound and exhibits dichroism, and the dichroic dye itself may have liquid crystallinity or may have a polymerizable group. Any compound in the composition has a polymerizable group. The composition may further include an initiator, a solvent, a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, a silane coupling agent, and the like. The liquid crystal coating type polarizer may be manufactured by coating a composition including a liquid crystal compound on an alignment layer and curing the liquid crystal compound in an aligned state. The liquid crystal coating type polarizer can be formed to be thinner than that of the stretched film type polarizer. The thickness of the liquid crystal coating type polarizer may be 0.5 to 10 µm, preferably 1 to 5 µm.

The alignment film can be produced, for example, by applying an alignment film forming composition on a substrate and imparting orientation by rubbing, polarized light irradiation, or the like. The composition for forming an alignment film may contain, in addition to the alignment agent, a solvent, a crosslinking agent, an initiator, a dispersing agent, a leveling agent, a silane coupling agent, and the like. As said aligning agent, polyvinyl alcohol, polyacrylates, polyamic acids, and polyimides can be used, for example. In the case of applying photo-alignment, it is preferable to use an alignment agent containing a cinnamate group. The polymer used as the alignment agent may have a weight average molecular weight of about 10,000 to 1,000,000. The alignment film is preferably 5 nm to 10000 nm, particularly preferably 10 to 500 nm, since the alignment regulating force is sufficiently expressed. The liquid crystal coating type polarizer may be peeled off from the substrate and transferred to another member, or the substrate may be laminated as it is. It is also preferable that the said base material plays a role as a transparent base material of a protective film, retardation plate, and a window.

As the protective film, any transparent polymer film may be used, and materials and additives used for the transparent substrate may be used. A cellulosic film, an olefinic film, an acrylic film, and a polyester-type film are preferable. An application-type protective film obtained by applying and curing a cationic curing composition such as an epoxy resin or a radical curing composition such as an acrylate may be used. If necessary, it may contain a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or dye, an optical brightener, a dispersant, a heat stabilizer, a light stabilizer, an antistatic agent, an antioxidant, a lubricant, a solvent, and the like. The thickness of the said protective film may be 200 micrometers or less, Preferably, they are 1 micrometer - 100 micrometers. When thickness exceeds 200 micrometers, flexibility may fall. It can also serve as a transparent base material of a window.

The λ/4 retardation plate is a film that provides a retardation of λ/4 in a direction (in-plane direction of the film) perpendicular to the traveling direction of incident light. The λ/4 retardation plate may be a stretched film retardation plate manufactured by stretching a polymer film such as a cellulose-based film, an olefin-based film, or a polycarbonate-based film. If necessary, retardation regulator, plasticizer, ultraviolet absorber, infrared absorber, colorant such as pigment or dye, optical brightener, dispersant, heat stabilizer, light stabilizer, antistatic agent, antioxidant, lubricant, solvent, etc. may be included. The thickness of the said stretched retardation plate may be 200 micrometers or less, Preferably, it is 1 micrometer - 100 micrometers. When thickness exceeds 200 micrometers, flexibility may fall.

Further, as another example of the λ/4 retarder, a liquid crystal coating type retarder formed by coating a composition containing a liquid crystal compound may be used. The composition includes a liquid crystal compound having a property of exhibiting a liquid crystal state such as nematic, cholesteric, and smectic. Any compound including a liquid crystal compound in the composition has a polymerizable group. The liquid crystal coating type retarder may further include an initiator, a solvent, a dispersant, a leveling agent, a stabilizer, a surfactant, a crosslinking agent, a silane coupling agent, and the like. The liquid crystal coating type retardation plate can be manufactured by coating a composition containing a liquid crystal compound on an alignment layer and curing the liquid crystal compound in an aligned state, similarly to that described in the liquid crystal coating type polarizer. The liquid-crystal-coated retardation plate may be formed to be thinner than a stretched film-type retardation plate. The thickness of the liquid crystal coating type retarder may be 0.5 to 10 µm, preferably 1 to 5 µm. The liquid-crystal-coated retardation plate may be peeled from the substrate and transferred to another member, or the substrate may be laminated as it is. It is also preferable that the said base material plays a role as a transparent base material of a protective film, a retardation plate, and a window.

In general, there are many materials that exhibit a higher birefringence as the wavelength is shorter and a smaller birefringence as the wavelength is longer. In this case, since a phase difference of λ/4 cannot be achieved in the full visible region, the in-plane phase difference of 100 to 180 nm, preferably 130 to 150 nm, which becomes λ/4 for the vicinity of 560 nm with high visibility, is designed to be Often times. It is preferable to use an inverse dispersion λ/4 retarder using a material having a birefringence wavelength dispersion characteristic opposite to that of usual, since visibility can be improved. As such a material, it is also preferable to use those disclosed in Japanese Patent Application Laid-Open No. 2007-232873, etc. for a stretched film retardation plate, and in Japanese Patent Application Laid-Open No. 2010-30979 for a liquid crystal coating-type retardation plate.

Also, as another method, a technique for obtaining a broadband λ/4 retarder by combining it with a λ/2 retarder is also known (Japanese Patent Laid-Open No. 10-90521). The λ/2 retardation plate is also manufactured by the same material method as the λ/4 retardation plate. The combination of the stretched film type retardation plate and the liquid crystal coating type retardation plate is arbitrary, but it is preferable to use either the liquid crystal coating type retardation plate because the film thickness can be reduced.

A method of stacking positive C plates on the circular polarizing plate in order to increase the visibility in the oblique direction is also known (Japanese Patent Application Laid-Open No. 2014-224837). The positive C plate may also be a liquid crystal coating type retardation plate or a stretched film type retardation plate. The phase difference in the thickness direction of the positive C plate is -200 to -20 nm at a wavelength of 560 nm, preferably -140 to -40 nm.

ADVANTAGE OF THE INVENTION According to this invention, since the laminated body containing the touch sensor which is very thin and has the outstanding impact resistance, the image display apparatus provided with the said laminated body, and the manufacturing method of the said laminated body can be obtained, it is useful.

1 touch sensor
2 support (first support)
3 support (second support)
4 embedding resin layer
10 Laminate
11 Laminate
12 Laminate

Claims (10)

A laminate comprising a touch sensor and a support formed on at least one surface of the touch sensor, wherein the support has a pattern structure. According to claim 1,
The support body has at least one structure selected from the group consisting of a honeycomb structure, a truss structure, a ramen structure, a stripe structure, and a circular structure. 3. The method of claim 1 or 2,
The thickness of the support is 1㎛ ~ 15㎛, the laminate. 4. The method according to any one of claims 1 to 3,
The width of the support in a plan view is 500 μm to 3000 μm, the laminate. 5. The method according to any one of claims 1 to 4,
The support is optically isotropic, the laminate. 6. The method according to any one of claims 1 to 5,
The laminated body provided with the embedding resin layer which embeds the said support body in the said one surface of the said touch sensor. 7. The method according to any one of claims 1 to 6,
The laminate has a compressive elastic modulus at 23° C. of the support of 0.01 GPa to 8.0 GPa. A laminate comprising the laminate according to any one of claims 1 to 7 and a circularly polarizing plate. The image display apparatus provided with the laminated body in any one of Claims 1-8. forming a pattern of a resin material on at least one surface of the touch sensor; and
A step of making a support having a pattern structure by curing the resin material
A method of manufacturing a laminate comprising a.

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