CN111458781A - Flexible laminate and image display device provided with same - Google Patents
Flexible laminate and image display device provided with same Download PDFInfo
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- CN111458781A CN111458781A CN201911354058.5A CN201911354058A CN111458781A CN 111458781 A CN111458781 A CN 111458781A CN 201911354058 A CN201911354058 A CN 201911354058A CN 111458781 A CN111458781 A CN 111458781A
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Optics & Photonics (AREA)
- Polarising Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
- Liquid Crystal (AREA)
- Surface Treatment Of Optical Elements (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a flexible laminate having excellent impact resistance and an image display device provided with the flexible laminate. The flexible laminate comprises, in order, a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer, and a touch sensor panel. When the thickness of the front panel is a [ mu ] m, the thickness of the 1 st adhesive layer is b [ mu ] m, the thickness of the circularly polarizing plate is c [ mu ] m, the thickness of the 2 nd adhesive layer is d [ mu ] m, and the thickness of the TS panel is e [ mu ] m, the following relation of formula (1) is satisfied: (b + d)/(a + b + c + d + e) ≥ 0.2 (1).
Description
Technical Field
The present invention relates to a flexible laminate and an image display device provided with the flexible laminate.
Background
In the field of various image display devices such as liquid crystal display devices and organic electroluminescence (E L) display devices, flexible displays are known in which a display panel can be bent or the like by using a flexible substrate (for example, patent documents 1 and 2).
Documents of the prior art
Patent document
Patent document 1: korean laid-open patent No. 10-2016-
Patent document 2: korean laid-open patent No. 10-2017-0093610
Disclosure of Invention
Although a flexible substrate is excellent in flexibility, it tends to have inferior impact resistance as compared with glass used in conventional image display devices.
The purpose of the present invention is to provide a flexible laminate having excellent impact resistance and an image display device provided with the flexible laminate.
The invention provides the following flexible laminate and image display device.
[ 1 ] A flexible laminate comprising a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer, and a touch sensor panel in this order,
the relation of the following formula (1) is satisfied when the thickness of the front panel is a [ mu ] m, the thickness of the 1 st adhesive layer is b [ mu ] m, the thickness of the circularly polarizing plate is c [ mu ] m, the thickness of the 2 nd adhesive layer is d [ mu ] m, and the thickness of the touch sensor panel is e [ mu ] m,
(b+d)/(a+b+c+d+e)≥0.2 (1)。
[ 2 ] the flexible laminate according to [ 1 ], wherein the thickness b of the 1 st adhesive layer and the thickness d of the 2 nd adhesive layer satisfy the following formula (2),
1≤b/d≤6 (2)。
[ 3 ] the flexible laminate according to [ 1 ] or [ 2 ], wherein the thickness b of the 1 st adhesive layer is larger than the thickness d of the 2 nd adhesive layer.
[ 4 ] the flexible laminate according to any one of [ 1 ] to [ 3 ], wherein the thickness b of the 1 st adhesive layer is 10 μm or more,
the thickness d of the 2 nd adhesive layer is 10 [ mu ] m or more.
The flexible laminate according to any one of [ 1 ] to [ 4 ], wherein the front sheet has a rigidity of 90MPa · mm to 700MPa · mm at a temperature of 23 ℃ and a relative humidity of 55%,
the rigidity of the circularly polarizing plate at a temperature of 23 ℃ and a relative humidity of 55% is 40 MPa.mm-400 MPa.mm,
the rigidity of the touch sensor panel at a temperature of 23 ℃ and a relative humidity of 55% is 15 MPa.mm to 700 MPa.mm.
The flexible laminate according to any one of [ 1 ] to [ 5 ], wherein the 1 st adhesive layer has a storage modulus of elasticity of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%,
the 2 nd adhesive layer has a storage elastic modulus of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%.
[ 7 ] the flexible laminate according to any one of [ 1 ] to [ 6 ], wherein when a total thickness t [ μm ] of the thickness a of the front sheet, the thickness b of the 1 st pressure-sensitive adhesive layer, the thickness c of the circularly polarizing plate, the thickness d of the 2 nd pressure-sensitive adhesive layer, and the thickness e of the touch sensor panel is represented by the following formula (3),
t＝a+b+c+d+e (3)
t is 250 μm or less.
The flexible laminate according to any one of [ 1 ] to [ 7 ], wherein the front sheet is a resin film or a resin film with a hard coat layer having a hard coat layer on at least one surface of the resin film.
The flexible laminate according to any one of [ 1 ] to [ 8 ], wherein the flexible laminate has a limit number of bending times of 5 ten thousand or more in a bending property test.
An image display device comprising the flexible laminate according to any one of [ 1 ] to [ 9 ], wherein the front panel is disposed on a front surface.
According to the present invention, a flexible laminate having excellent impact resistance and an image display device including the flexible laminate can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view schematically showing an example of a flexible laminate according to the present invention.
Fig. 2 is a schematic cross-sectional view schematically showing an example of the image display device of the present invention.
Description of the symbols
10 front panel, 201 st adhesive layer, 30 circular polarizing plate, 31 linear polarizing plate, 32 retardation layer, 40 nd 2 nd adhesive layer, 50 touch sensor panel, 60 lamination layer, 100 flexible laminate, 200 display laminate, 300 image display device.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments below. In all the drawings below, the scale of each component shown in the drawings is not necessarily the same as the scale of the actual component, and the scale is appropriately adjusted to facilitate understanding of each component.
(Flexible laminate)
Fig. 1 is a schematic cross-sectional view schematically showing an example of a flexible laminate according to the present embodiment. The flexible laminate 100 includes a front panel 10, a 1 st adhesive layer 20, a circularly polarizing plate 30, a 2 nd adhesive layer 40, and a touch sensor panel (hereinafter, sometimes referred to as a "TS panel") 50. As shown in fig. 1, the flexible laminate 100 is formed by laminating a front panel 10, a 1 st adhesive layer 20, a circularly polarizing plate 30, a 2 nd adhesive layer 40, and a TS panel 50 in this order from the viewing side.
The flexible laminate 100 has flexibility, and thus can be applied to an image display device (flexible display) that can be bent, rolled, or the like. The flexible laminate 100 of the present embodiment is particularly a flexible laminate having excellent flexibility in which the front panel 10 side is bent as the inner side. The flexible laminate 100 is bendable without causing cracks. The flexible laminate 100 preferably has flexibility in which the limit number of times of bending, which is the number of times of bending of cracks or bulges of the pressure-sensitive adhesive layer in the region where bending occurs, is 5 ten thousand or more, more preferably 10 ten thousand or more, and still more preferably 20 ten thousand or more, in a bending test of an example to be described later. The bending test can be performed by the method of the example described later.
The flexible laminate 100 can constitute an image display device as described above, and is particularly suitable for a flexible display device that can be bent, rolled, or the like, and further, the flexible laminate 100 can be used as an antireflection film for an organic electroluminescence (E L) display device, for example, because it includes the circularly polarizing plate 30.
The flexible laminate 100 satisfies the following equation (1) when the thickness of the front panel 10 is a [ mu ] m, the thickness of the 1 st pressure-sensitive adhesive layer 20 is b [ mu ] m, the thickness of the circularly polarizing plate 30 is c [ mu ] m, the thickness of the 2 nd pressure-sensitive adhesive layer 40 is d [ mu ] m, and the thickness of the TS panel 50 is e [ mu ] m,
(b+d)/(a+b+c+d+e)≥0.2 (1)。
hereinafter, the total thickness t [ μm ] of the front panel 10, the 1 st adhesive layer 20, the circularly polarizing plate 30, the 2 nd adhesive layer 40 and the TS panel 50 may be expressed by the following formula (3),
t＝a+b+c+d+e (3)。
the ratio of (b + d)/t (here, t is represented by the formula (3)) in the formula (1) is preferably 0.25 or more, and may be 0.3 or more, and may also be 0.35 or more, and usually 0.65 or less, and may also be 0.6 or less.
Since the 1 st adhesive layer 20 and the 2 nd adhesive layer 40 are layers formed of an adhesive, they tend to have lower rigidity and superior impact absorption compared to other layers (the front panel 10, the circularly polarizing plate 30, and the TS panel 50) forming the flexible laminate 100. Therefore, when the flexible laminate 100 satisfies the relationship of the formula (1), the 1 st adhesive layer 20 and the 2 nd adhesive layer 40 can be formed in the flexible laminate 100 to have a thickness equal to or larger than a certain thickness. This improves the impact absorption of the entire flexible laminate 100, thereby improving the impact resistance.
On the other hand, when the flexible laminate does not satisfy the relationship of formula (1), the impact absorption of the flexible laminate as a whole is lowered, and the impact resistance is likely to be lowered.
In recent years, thinning and weight reduction of image display devices have been advanced, and members used in image display devices are also required to be thinned and reduced in weight, and the flexible laminate 100 is also required to be reduced in thickness. When the thickness of the flexible laminate 100 is reduced, the thicknesses of the respective layers (the front panel 10, the 1 st adhesive layer 20, the circularly polarizing plate 30, the 2 nd adhesive layer 40, and the TS panel 50) forming the flexible laminate 100 are required to be reduced. In this case, the front panel 10, the circularly polarizing plate 30, and the TS panel 50 generally need to have a certain thickness in order to achieve the functions of the respective layers, and therefore, there is a limit to reducing the thickness of these layers. On the other hand, the thickness of the 1 st adhesive layer 20 and the 2 nd adhesive layer 40 can be reduced as long as the layers can be bonded to each other, but it is found that, particularly, when the thickness b of the 1 st adhesive layer 20 and the thickness d of the 2 nd adhesive layer 40 are too small, the strength required for the flexible laminate 100 tends to be reduced. In the flexible laminate 100 of the present embodiment, the thickness b of the 1 st pressure-sensitive adhesive layer 20 and the thickness d of the 2 nd pressure-sensitive adhesive layer 40 are set so as to satisfy the relationship of the formula (1) with respect to the total thickness t represented by the formula (3) as described above. Therefore, even in the flexible laminate 100 having a small total thickness t, excellent impact resistance can be achieved.
The total thickness t represented by the above formula (3) is not particularly limited, and may be, for example, 1000 μm or less, and is preferably 250 μm or less, more preferably 220 μm or less, and may be 200 μm or less, and may be 180 μm or less, and may be 150 μm or less, and usually 40 μm or more, and may be 70 μm or more in order to cope with thinning and to exhibit good flexibility.
The flexible laminate 100 preferably has a thickness b of the 1 st adhesive layer 20 and a thickness d of the 2 nd adhesive layer 40 satisfying the following expression (2),
1≤b/d≤6 (2)。
the thickness b of the 1 st pressure-sensitive adhesive layer 20 is preferably larger than the thickness d of the 2 nd pressure-sensitive adhesive layer 40, and therefore, b/d in the above formula (2) is preferably more than 1, more preferably 1.2 or more, and may be 1.5 or more, and may be 2 or more. In the formula (2), b/d is preferably 5.5 or less, more preferably 5.2 or less, and may be 5 or less.
By the flexible laminate 100 satisfying the relationship of the above expression (1) and the relationship of the thickness b of the 1 st pressure-sensitive adhesive layer 20 and the thickness d of the 2 nd pressure-sensitive adhesive layer 40 being the above expression (2), the flexible laminate 100 having excellent flexibility can be obtained in which the front panel 10 side is bent particularly inward. This is presumably because, by adopting the relationship of the above expression (2), when the flexible laminate 100 is bent with the front panel 10 side being the inner side, the stress generated in the front panel 10 is less likely to be transmitted to the circularly polarizing plate 30, and the occurrence of cracks in the flexible laminate 100 (particularly, the circularly polarizing plate 30) can be suppressed.
The shape of the flexible laminate 100 in the plane direction is not particularly limited, but is preferably a square shape, and more preferably a rectangular shape. When the flexible laminate 100 has a rectangular shape, the length of the long side is preferably 50mm to 300mm, and may be 100mm to 280mm, and the length of the short side is preferably 30mm to 250mm, and may be 60mm to 220mm, for example. The flexible laminate 100 may have a rounded square shape obtained by R-processing at least 1 of the corners of the square shape, or may have a square shape having a cutout on at least one side. In addition, the flexible laminate 100 may be provided with a hole penetrating in the lamination direction.
(front panel)
The front panel 10 is a plate-like body that can function as a layer for protecting a display element of an image display device and the like and can transmit light, and the plate-like body is preferably made of glass or resin in general. The front panel 10 may be disposed at the outermost surface of the image display device. The front panel 10 is preferably a resin film or a resin film with a hard coat layer having a hard coat layer provided on at least one surface of the resin film to further increase the hardness. In addition, the front panel 10 may have a blue light cut-off function, a viewing angle adjustment function, and the like.
The resin film forming the front panel 10 is not limited as long as it is a resin film that can transmit light. Examples of the film include films formed of polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, poly (meth) methyl acrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. When the image display device 300 is a flexible display, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide is preferably used so as to have excellent flexibility, high strength, and high transparency.
The resin film with a hard coat layer forming the front panel 10 may have a hard coat layer on one side of the resin film or may have a hard coat layer on both sides of the resin film. When the resin film has hard coat layers on both surfaces thereof, the composition and thickness of each hard coat layer may be the same or different from each other. The resin film with a hard coat layer can have improved hardness and scratch resistance as compared with a resin film without a hard coat layer.
The hard coat layer of the resin film with a hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth) acrylic resins such as monofunctional (meth) acrylic resins, polyfunctional (meth) acrylic resins, and polyfunctional (meth) acrylic resins having a dendrimer structure; a silicone resin; a polyester resin; a urethane resin; an amide resin; epoxy resins, and the like. The hard coating may contain additives for the purpose of improving strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.
The rigidity of the front panel 10 at a temperature of 23 ℃ and a relative humidity of 55% is preferably 90MPa · mm or more, more preferably 150MPa · mm or more, further preferably 200MPa · mm or more, and is preferably 700MPa · mm or less, more preferably 500MPa · mm or less, further preferably 400MPa · mm or less. If the rigidity of the front panel 10 is small, the strength of the flexible laminate 100 tends to decrease, and if the rigidity of the front panel 10 is large, the flexibility of the flexible laminate 100 tends to decrease. When the rigidity of the front panel 10 is in the above range, the flexible laminate 100 satisfies the above formula (1), and the flexible laminate 100 having excellent impact resistance can be preferably obtained. In addition, the flexible laminate 100 satisfies the relationships of the above formulae (1) and (2), and the flexible laminate 100 having good flexibility and excellent impact resistance can be obtained favorably.
The rigidity of the front panel 10 can be determined by the tensile elastic modulus Ea [ MPa ] of the front panel 10 at a temperature of 23 ℃ and a relative humidity of 55%]Thickness [ mm ] of the front panel 10]Product of (Ea [ MPa ]]×a[μm]×10－3) And then calculated. The thickness a of the front panel 10 may be, for example, 30 to 500. mu.m, preferably 50 to 250. mu.m, and more preferably 50 to 100. mu.m. The tensile elastic modulus Ea of the front panel 10 may be, for example, 500MPa to 10000MPa, preferably 1000MPa to 9000MPa, more preferably 2000MPa to 8000MPa, and still more preferably 3000MPa to 7000 MPa.
The rigidity of the front panel 10 can be calculated by the product of the tensile elastic modulus [ MPa ] of the entire front panel 10 at a temperature of 23 ℃ and a relative humidity of 55% and the thickness [ mm ] of the entire front panel 10.
(1 st adhesive layer)
The 1 st adhesive layer 20 is a layer for bonding the front panel 10 and the circularly polarizing plate 30, and may be formed using an adhesive composition. The thickness b of the 1 st pressure-sensitive adhesive layer 20 is not particularly limited as long as it satisfies the relationship between the above-described formulas (1) and (2), and is preferably 5 μm or more, more preferably 7 μm or more, further preferably 10 μm or more, and may be 20 μm or more, and is usually 100 μm or less, preferably 90 μm or less, and more preferably 80 μm or less.
The storage elastic modulus Gb of the 1 st pressure-sensitive adhesive layer 20 at a temperature of 25 ℃ and a relative humidity of 50% is preferably 0.01MPa or more, more preferably 0.05MPa or more, further preferably 0.07MPa or more, and further preferably 0.15MPa or less, more preferably 0.12MPa or less, further preferably 0.1MPa or less.
When the storage elastic modulus Gb of the 1 st adhesive layer 20 is not in the above range, the flexibility of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gb of the 1 st pressure-sensitive adhesive layer 20 is in the above range, the flexible laminate 100 satisfies the above formula (1), and the flexible laminate 100 having excellent impact resistance can be preferably obtained. In addition, the flexible laminate 100 satisfies the relationships of the above formulae (1) and (2), and the flexible laminate 100 having good flexibility and excellent impact resistance can be obtained favorably.
The 1 st pressure-sensitive adhesive layer 20 may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. Among them, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance and the like. The adhesive composition may be an active energy ray-curable type or a thermosetting type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, a polymer or copolymer containing 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate as monomers is preferably used. The base polymer preferably copolymerizes polar monomers. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include metal ions having a valence of 2 or more and a metal carboxylate salt formed between the crosslinking agent and a carboxyl group; polyamine compounds and substances which form amide bonds with carboxyl groups; a polyepoxy compound or a polyhydric alcohol and forming an ester bond with a carboxyl group; a polyisocyanate compound and a substance forming an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition having a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and having a property of having adhesiveness even before irradiation with an active energy ray and being capable of being bonded to an adherend such as a film and being cured by irradiation with an active energy ray, thereby adjusting the bonding force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, a photopolymerization initiator, a photosensitizer and the like may be contained as necessary.
The pressure-sensitive adhesive composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, anticorrosion agents, and photopolymerization initiators for imparting light scattering properties.
The 1 st adhesive layer 20 can be formed by applying an organic solvent diluted solution of the adhesive composition described above to a substrate and drying it. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be obtained by irradiating the pressure-sensitive adhesive layer formed with an active energy ray.
(circular polarizing plate)
The circularly polarizing plate 30 may include a linearly polarizing plate 31 and a retardation layer 32, and the linearly polarizing plate 31 may be disposed on the 1 st adhesive layer 20 side and the retardation layer 32 may be disposed on the 2 nd adhesive layer 40 side. The circularly polarizing plate 30 can convert light (external light) incident through the flexible laminate 100 from the viewing side of the image display device having the flexible laminate 100 into circularly polarized light. Further, since the circularly polarizing plate 30 can absorb external light reflected by the display element, the flexible laminate 100 can be provided with a function as an antireflection film.
The rigidity of the circularly polarizing plate 30 at a temperature of 23 ℃ and a relative humidity of 55% is preferably 40MPa · mm or more, more preferably 100MPa · mm or more, further preferably 150MPa · mm or more, and further preferably 400MPa · mm or less, more preferably 350MPa · mm or less, further preferably 300MPa · mm or less. If the rigidity of the circularly polarizing plate 30 is small, the strength of the flexible laminate 100 tends to decrease, and if the rigidity of the circularly polarizing plate 30 is large, the flexibility of the flexible laminate 100 tends to decrease. When the rigidity of the circularly polarizing plate 30 is in the above range, the flexible laminate 100 satisfies the above formula (1), and the flexible laminate 100 having excellent impact resistance can be preferably obtained. In addition, the flexible laminate 100 satisfies the relationships of the above formulae (1) and (2), and the flexible laminate 100 having good flexibility and excellent impact resistance can be obtained favorably.
The rigidity of the circularly polarizing plate 30 can be determined by the tensile elastic modulus Ec [ MPa ] of the circularly polarizing plate 30 as a whole at 23 ℃ and 55% relative humidity]Thickness [ mm ] of the entire circular polarizing plate 30]Product of (Ec [ MPa ])]×c[μm]×10－3) And then calculated.
(Linear polarizer)
The linearly polarizing plate 31 has a function of selectively transmitting linearly polarized light in a certain direction from a light beam of unpolarized light such as natural light. Examples of the linearly polarizing plate 31 include a film contained in a polarizer, which is a stretched film having a dye having absorption anisotropy absorbed thereon, or a film obtained by coating and curing a dye having absorption anisotropy. Examples of the dye having absorption anisotropy include dichroic dyes. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dye includes a dichroic direct dye composed of a bisazo compound such as c.i. direct RED 39, and a dichroic direct dye composed of a compound such as trisazo or tetraazo. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizer, include a stretched film in which a dye having absorption anisotropy is adsorbed, and a film having a layer obtained by coating a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal and curing the composition. The film obtained by applying and curing the dye having absorption anisotropy is preferable to the stretched film having the dye having absorption anisotropy absorbed thereon because the bending direction of the film is not limited.
(polarizing plate having a stretched film as a polarizer)
A description will be given of a linear polarizing plate including, as a polarizer, a stretched film having a dye having absorption anisotropy adsorbed thereon. A stretched film as a polarizer, to which a dye having absorption anisotropy is adsorbed, is generally produced through the following steps: the method for producing a polyvinyl alcohol film comprises a step of uniaxially stretching a polyvinyl alcohol resin film, a step of dyeing the polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film with water after the treatment with the aqueous boric acid solution. The polarizer may be used as it is as a linear polarizing plate, or a polarizing plate obtained by laminating a transparent protective film on one or both surfaces thereof may be used as a linear polarizing plate. The thickness of the polarizer thus obtained is preferably 2 μm to 40 μm.
The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually about 1000 to 10000, and preferably in the range of 1500 to 5000.
A film obtained by forming such a polyvinyl alcohol resin is used as a raw film for a polarizer. The method for forming the film from the polyvinyl alcohol resin is not particularly limited, and the film can be formed by a known method. The thickness of the polyvinyl alcohol-based raw film may be, for example, about 10 μm to 150 μm.
The uniaxial stretching of the polyvinyl alcohol resin film may be performed before, simultaneously with, or after the dyeing with the dichroic dye. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before the boric acid treatment or may be performed in the boric acid treatment. In addition, uniaxial stretching may be performed in these plural stages. In the case of uniaxial stretching, the stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a heat roll. The uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol resin film is swollen with a solvent. The draw ratio is usually about 3 to 8 times.
The thickness of the linearly polarizing plate provided with a stretched film as a polarizer may be, for example, 1 μm to 400 μm, or 5 μm or more, or 7 μm or more, or 100 μm or less, or 50 μm or less, or 20 μm or less, or 10 μm or less. The linear polarizing plate having a stretched film as a polarizer may have a tensile elastic modulus at a temperature of 25 ℃ of 1000MPa to 5000MPa, for example.
The material of the protective film to be attached to one or both surfaces of the polarizer is not particularly limited, and examples thereof include films known in the art, such as a cyclic polyolefin resin film, an acetate resin film made of a resin such as triacetyl cellulose or diacetyl cellulose, a polyester resin film made of a resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate, a polycarbonate resin film, a (meth) acrylic resin film, and a polypropylene resin film. From the viewpoint of thinning, the thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, and usually 5 μm or more, preferably 20 μm or more. The protective film may or may not have a phase difference.
(polarizing plate having polarizer made of film formed of liquid crystal layer)
A linear polarizing plate including a film formed of a liquid crystal layer as a polarizer will be described. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizer, include films obtained by applying a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound to a substrate and curing the composition. The film may be used as a linear polarizer by peeling off or using a substrate together with the substrate, or may be used as a linear polarizer having a structure in which a protective film is provided on one surface or both surfaces thereof. Examples of the protective film include those similar to the linear polarizing plate having the stretched film as the polarizer.
Specific examples of the film coated with the dye having absorption anisotropy include films described in japanese patent application laid-open nos. 2013-37353 and 2013-33249.
The thinner the film obtained by applying and curing a pigment having absorption anisotropy, the more preferable it is, but if it is too thin, the strength tends to decrease and the processability tends to be poor. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 to 3 μm or less. The thickness of the linearly polarizing plate provided with the polarizer made of the liquid crystal layer may be, for example, 1 to 50 μm, and the tensile elastic modulus at 23 ℃ and 55% relative humidity of the linearly polarizing plate provided with the polarizer made of the liquid crystal layer may be, for example, 500 to 5000 MPa.
(retardation layer)
The retardation layer 32 may be 1 layer or 2 or more layers. Further, the retardation film may have an overcoat layer for protecting the surface of the retardation layer and a base film for supporting the retardation layer. The phase difference layer 32 includes a λ/4 layer, and may further include a λ/2 layer and a positive C layer. When the retardation layer 32 includes a λ/2 layer, a λ/2 layer and a λ/4 layer are stacked in this order from the linearly polarizing plate 31 side. When the retardation layer 32 includes a positive C layer, the λ/4 layer and the positive C layer may be stacked in this order from the linearly polarizing plate 31 side, or the positive C layer and the λ/4 layer may be stacked in this order from the linearly polarizing plate 31 side.
The retardation layer 32 may be formed of the resin film exemplified as the material of the protective film, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer 32 may further include an alignment film, a base film, or a lamination layer for laminating the λ/4 layer with the λ/2 layer or the positive C layer. The adhesive layer is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition or a known adhesive composition. Examples of known adhesive compositions include aqueous adhesive compositions such as polyvinyl alcohol resin aqueous solutions and aqueous two-pack type urethane emulsion adhesives; and an active energy ray-curable adhesive composition which cures when irradiated with an active energy ray such as ultraviolet ray.
The thickness of the retardation layer may be, for example, 1 to 50 μm, and the tensile elastic modulus at 23 ℃ and 55% relative humidity of the retardation layer having a film formed of a liquid crystal layer may be, for example, 1000 to 4000 MPa.
(No. 2 adhesive layer)
The 2 nd adhesive layer 40 is a layer for bonding the circularly polarizing plate 30 and the TS panel 50, and may be formed using an adhesive composition. The thickness d of the 2 nd pressure-sensitive adhesive layer 40 is not particularly limited as long as it satisfies the relationship between the above-described formulas (1) and (2), and is preferably 10 μm or more, more preferably 20 μm or more, further preferably 25 μm or more, and may be 30 μm or more, and is usually 80 μm or less, preferably 70 μm or less, and more preferably 60 μm or less.
The storage elastic modulus Gd of the 2 nd pressure-sensitive adhesive layer 40 at a temperature of 25 ℃ and a relative humidity of 50% is preferably 0.01MPa or more, more preferably 0.05MPa or more, further preferably 0.07MPa or more, and further preferably 0.15MPa or less, more preferably 0.12MPa or less, further preferably 0.1MPa or less.
If the storage elastic modulus Gd of the 2 nd adhesive layer 40 is small, the impact resistance of the flexible laminate 100 tends to decrease, and if the storage elastic modulus Gd of the 2 nd adhesive layer 40 is large, the flexibility of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gd of the 2 nd pressure-sensitive adhesive layer 40 is in the above range, the flexible laminate 100 satisfies the above formula (1), and the flexible laminate 100 having excellent impact resistance can be preferably obtained. In addition, the flexible laminate 100 satisfies the relationship between the above expressions (1) and (2), and the flexible laminate 100 having good flexibility and excellent impact resistance can be obtained favorably.
As the adhesive composition constituting the 2 nd adhesive layer 40, an adhesive composition exemplified as the adhesive composition constituting the 1 st adhesive layer 20 can be used. The adhesive composition constituting the 2 nd adhesive layer 40 may be the same as or different from the adhesive composition constituting the 1 st adhesive layer 20. The 2 nd adhesive layer 40 may be formed in the same manner as the 1 st adhesive layer 20.
(touch sensor panel)
The TS panel 50 is not limited to a detection method as long as it is a sensor capable of detecting a touched position, and examples thereof include TS panels of a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. In view of low cost, a TS panel of a resistive film type or a capacitive coupling type is preferably used.
An example of a resistive-film TS panel includes a pair of substrates arranged to face each other, an insulating spacer sandwiched between the pair of substrates, a transparent conductive film provided as a resistive film on an inner front surface of each substrate, and a touch position detection circuit. In an image display device provided with a resistive touch sensor panel, if the surface of the front panel 10 is touched, the opposing resistive films are short-circuited, and a current flows through the resistive films. The touch position detection circuit detects the change of the voltage at the moment and detects the touched position.
An example of the TS panel of the capacitive coupling system includes a substrate, and a position detection transparent electrode provided on the entire surface of the substrate is constituted by a touch position detection circuit. In an image display device provided with a TS panel of the capacitive coupling method, if the surface of the front panel 10 is touched, the transparent electrode is grounded at the touched point via the electrostatic capacitance of the human body. The touch position detection circuit detects the grounding of the transparent electrode and detects the touched position.
The TS panel 50 may be configured only by the touch sensor pattern layer, or may include the touch sensor pattern layer and a support layer supporting the touch sensor pattern layer. When the TS panel 50 includes the touch sensor pattern layer and the support layer, the touch sensor pattern layer and the support layer may be joined by a bonding layer, or the touch sensor pattern layer may be formed on the support layer without interposing the bonding layer. The adhesive layer is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition and the adhesive composition described above.
The touch sensor pattern layer included in the TS panel 50 may include a conductive layer such as an electrode or a wiring. The conductive layer is preferably formed so as not to be visually recognized when used as the TS panel 50 in a flexible laminate. The touch sensor pattern layer may include a separation layer. The separation layer may be formed on a substrate such as glass, and provided to separate the touch sensor pattern layer formed on the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material for forming the inorganic layer include silicon oxide. Examples of the material for forming the organic layer include a (meth) acrylic resin composition, an epoxy resin composition, and a polyimide resin composition. The touch sensor pattern layer may further include at least 1 protective layer. The protective layer may be in contact with the conductive layer and provided to support the conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by spin coating, sputtering, evaporation, or the like. The conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, or gold. The touch sensor pattern layer may be formed only of a conductive layer such as an electrode or a wiring. The support layer is preferably a resin film, and examples of the support layer include a polyester resin film such as a cycloolefin resin film and a polyethylene terephthalate resin film, an acrylic resin film, and a triacetyl cellulose resin film.
The rigidity of the TS panel 50 at a temperature of 23 ℃ and a relative humidity of 55% is preferably 15MPa · mm or more, more preferably 50MPa · mm or more, further preferably 100MPa · mm or more, further preferably 150MPa or more, and further preferably 700MPa · mm or less, more preferably 600MPa · mm or less, further preferably 500MPa · mm or less. If the stiffness of the TS panel 50 is small, the strength of the flexible laminate 100 tends to decrease, and if the stiffness of the TS panel 50 is large, the flexibility of the flexible laminate 100 tends to decrease. When the stiffness of the TS panel 50 is within the above range, the flexible laminate 100 satisfying the above formula (1) can preferably provide the flexible laminate 100 having excellent impact resistance. Further, by the flexible laminate 100 satisfying the relationship between the above expressions (1) and (2), the flexible laminate 100 having good flexibility and excellent impact resistance can be obtained favorably.
The rigidity of the TS panel 50 mayThe tensile elastic modulus Ee [ MPa ] at 23 ℃ and 55% relative humidity of the entire TS panel 50]Thickness [ mm ] of the TS panel 50 as a whole]Product of (Ee [ MPa ]]×e[μm]×10－3) And then calculated. The thickness e of the TS panel 50 may be, for example, 5 to 500 μm, 5 to 100 μm, or 5 to 50 μm. The tensile elastic modulus Ee of the touch sensor panel may be, for example, 1000MPa to 7000MPa, or 1200MPa to 6000 MPa.
(image display device)
Fig. 2 is a schematic cross-sectional view schematically showing an example of the image display device of the present embodiment. The image display device 300 includes a flexible laminate 100 including a front panel 10 disposed on a front surface (a viewing side) thereof, a display laminate 200 including a display unit, and a bonding layer 60, and the display laminate 200 is laminated on the TS panel 50 side of the flexible laminate 100 via the bonding layer 60. Since the flexible laminate 100 of the image display device 300 includes the TS panel 50, it can be used as a touch panel display device.
The image display device 300 may be a flexible display panel. The image display device as a flexible display may be configured such that the front panel 10 can be folded with the front surface thereof facing inward, or may be configured such that the front panel 10 can be rolled with the front surface thereof facing inward.
The laminating layer 60 is used to laminate the TS panel 50 and the display laminate 200 in the flexible laminate 100. When the flexible laminate 100 and the display laminate 200 are laminated, for example, a bonding layer 60 may be provided on the TS panel 50 of the flexible laminate 100, and the display laminate 200 may be laminated on the bonding layer 60. The adhesive layer 60 is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition and the adhesive composition described above.
Examples of the display cell included in the display laminate 200 include display cells including display elements such as a liquid crystal display element, an organic E L display element, an inorganic E L display element, a plasma display element, and a field emission display element.
The image display device 300 can be used as a mobile device such as a smart phone or a tablet computer, a television, a digital photo frame, an electronic sign, a measuring instrument, a meter, an office machine, a medical machine, a personal computer, or the like.
Examples
The present invention will be described in further detail with reference to examples, but the present invention is not limited to these examples. In examples and comparative examples, "%" and "part(s)" are% by mass and part(s) by mass unless otherwise specified.
[ measurement of thickness ]
The thickness of each layer forming the flexible laminate was measured by the following procedure. The flexible laminate was cut with a laser cutter, the cross section of the cut flexible laminate was observed with a transmission type electron microscope (SU8010, manufactured by horiba ltd), and the thickness of each layer forming the flexible laminate was measured from the obtained observation image.
[ measurement of tensile elastic modulus ]
Then, both ends in the longitudinal direction of the measurement sample were held by upper and lower jigs of a tensile tester (Autograph AG-Xplus tester manufactured by Shimadzu corporation) so that the interval between the jigs was 5cm, the measurement sample was stretched at a stretching speed of 4 mm/min in the longitudinal direction of the measurement sample in an environment of 23 ℃ and 55% relative humidity, and the tensile elastic modulus [ MPa ] at 23 ℃ and 55% relative humidity was calculated from the slope of the line between 20 and 40MPa of the obtained stress-strain curve.
[ calculation of rigidity ]
The rigidity is calculated by calculating the product of the thickness value and the tensile modulus value.
[ measurement of storage modulus of elasticity ]
The storage elastic modulus (Gb, Gd) of the measurement sample in which the pressure-sensitive adhesive layers (1 st pressure-sensitive adhesive layer or 2 nd pressure-sensitive adhesive layer) were stacked to have a thickness of 150 μm was measured using a rheometer (Anton Parr, MCR-301) under conditions of a temperature of 25 ℃, a relative humidity of 50%, a stress of 1%, and a frequency of 1 Hz.
[ impact resistance test ]
The touch sensor panel side of the flexible laminates obtained in examples and comparative examples was fixed to Glass (Soda Glass 1.1T, JMC Glass Co.) using an optical adhesive sheet (8146-04, 3M) having a thickness of 100 μ M, and samples for evaluation were prepared. The sample for evaluation was set in an impact resistance test apparatus (DropTester, manufactured by TAEWON TECH co.) so that the front panel side was upward, and then an impact resistance test was performed at a temperature of 25 ℃ by allowing a test ball to freely fall from a position 5cm above the surface of the front panel side of the panel for evaluation. The impact resistance test was carried out while changing the weight of the test ball, and the weight of the test ball at the time of glass cracking located in the lower portion of the sample for evaluation was determined. The weight of the test ball at the time of glass cracking of the sample for evaluation was set to
The case where 100g or more is set as A,
b is set to be 50g or more and less than 100g,
the case of less than 50g is set as C,
impact resistance was evaluated in this manner.
[ bending test ]
The bending test was carried out at a temperature of 25 ℃ by the procedure shown below. The flexible laminates obtained in examples and comparative examples were set in a flat state (unbent state) in a bending tester (CFT-720C, Covotech), and a bending operation was performed to return the flexible laminates to an original flat state after bending the flexible laminates so that the distance between the facing front panels when the front panel side was bent inward became 4.0 mm. The bending operation was repeated 1 time by the number of bending times 1 time. The number of bending times when cracks or swelling of the adhesive layer occurred in the region bent by the bending operation was determined as the limit number of bending times. The occurrence of cracks or bulging of the adhesive layer in the area to be bent by the bending operation
A case where the number of bending times reached 20 ten thousand times and was not found was set as a,
b represents the case found when the number of bending times is 10 ten thousand or more and less than 20 ten thousand,
c is the number of bends found when the number of bends is 5 ten thousand or more and less than 10 ten thousand,
the case found when the number of bending times is less than 5 ten thousand is set as D,
the bending test was evaluated in this manner.
[ example 1 ]
(preparation of front Panel)
A resin film with a hard coat layer having a thickness of 50 μm and a hard coat layer formed on both sides of the resin film was prepared as a front panel. The resin film was a polyimide-based resin film having a thickness of 30 μm, and the hard coat layers were each a layer having a thickness of 10 μm and formed of a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
(preparation of adhesive layer 1)
An acrylic pressure-sensitive adhesive composition was applied to the release film, and the release film-attached 1 st pressure-sensitive adhesive layer on which the 1 st pressure-sensitive adhesive layer was formed was dried. The 1 st adhesive layer has a thickness of 50 μm and a storage elastic modulus Gb of 0.09MPa at a temperature of 25 ℃ and a relative humidity of 50%.
(preparation of circular polarizing plate)
After a photo-alignment film was formed on a substrate, a composition containing a dichroic dye and a polymerizable liquid crystal compound was applied to the substrate, and alignment and curing were carried out to obtain a polarizer (tensile elastic modulus at 23 ℃ C. and 55% relative humidity: 937MPa) having a thickness of 2.5. mu.m. A triacetyl cellulose (TAC) film (manufactured by Konika minolta Co., Ltd., tensile modulus at 23 ℃ and 55% relative humidity: 3282MPa) having a thickness of 25 μm as a protective film was bonded to the polarizer via an adhesive layer, and then the substrate was peeled off to obtain a linearly polarizing plate.
The substrate of the obtained linear polarizing plate was peeled off and the surface exposed was bonded to the λ/4 layer side of the retardation layer described later to obtain a circular polarizing plate. The retardation layer was 14 μm thick and constituted a retardation layer in which a pressure-sensitive adhesive layer, a λ/4 layer, a pressure-sensitive adhesive layer and a positive C layer were laminated in this order. The adhesive layers were each 5 μm thick and had a storage modulus of elasticity of 0.6MPa at 25 ℃ and 50% relative humidity. The lambda/4 layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 3 μm. The positive C layer had a layer obtained by curing a liquid crystal compound and an alignment film, and had a thickness of 1 μm.
(preparation of adhesive layer 2)
An acrylic pressure-sensitive adhesive composition was applied to the release film, and the release film-attached 2 nd pressure-sensitive adhesive layer having the 2 nd pressure-sensitive adhesive layer was prepared by drying. The thickness of the 2 nd adhesive layer was 10 μm, and the storage elastic modulus Gd at a temperature of 25 ℃ and a relative humidity of 50% was 0.1 MPa.
(preparation of touch sensor Panel (1))
A touch sensor pattern layer is prepared as a TS panel (1). The touch sensor pattern layer comprises an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a release layer, and has a thickness of 7 μm and a tensile elastic modulus of 4510MPa at a temperature of 23 ℃ and a relative humidity of 55%. The rigidity of the TS panel (1) is 31.6 MPa-mm.
(production of Flexible laminate)
One surface of the front panel and the surface of the 1 st pressure-sensitive adhesive layer with the release film on the 1 st pressure-sensitive adhesive layer side were subjected to corona treatment, and the corona-treated surfaces were bonded to each other. Next, the surface exposed by peeling the release film bonded to the 1 st adhesive layer and the surface of the circularly polarizing plate on the linear polarizing plate side were subjected to corona treatment, and the corona-treated surfaces were bonded to each other to obtain a composite of the front panel and the circularly polarizing plate. Next, the surface of the composite on the positive C layer side and the surface of the release film on the 2 nd pressure-sensitive adhesive layer side of the 2 nd pressure-sensitive adhesive layer were subjected to corona treatment, and the corona-treated surfaces were bonded to each other. Next, the surface exposed by peeling the release film adhered to the 2 nd pressure-sensitive adhesive layer was subjected to corona treatment, and the corona-treated surface was laminated to the transparent conductive layer side of the TS panel (1) to obtain a flexible laminate. The corona treatment was performed at a frequency of 20kHz, a voltage of 8.6kV, a power of 2.5kW, and a speed of 6 m/min.
The total thickness t [ μm ] (thickness represented by the above formula (3)) of the front panel 10, the 1 st adhesive layer 20, the circularly polarizing plate 30, the 2 nd adhesive layer 40 and the TS panel 50 of the obtained flexible laminate was 158.5 μm, and the flexible laminate was subjected to an impact resistance test and a bending test at a vertical length of 177mm × and a horizontal length of 105mm, and the results are shown in table 1.
[ example 2 ]
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st adhesive layer and the 2 nd adhesive layer had thicknesses and storage elastic moduli at 25 ℃ described in table 1 and were used as the 1 st adhesive layer and the 2 nd adhesive layer. The obtained flexible laminate was subjected to an impact resistance test and a bending property test. The results are shown in table 1.
[ example 3 ]
(preparation of touch sensor Panel (2))
A TS panel (2) is prepared by laminating a touch sensor pattern layer, an adhesive layer, and a support layer in this order. The touch sensor pattern layer comprises an ITO layer as a transparent conductive layer and a cured layer of an acrylic resin composition as a release layer, and has a thickness of 7 μm and a tensile elastic modulus of 4510MPa at a temperature of 23 ℃ and a relative humidity of 55%. The adhesive layer was provided on the separation layer side of the touch sensor pattern layer, and the support layer was a cyclic polyolefin (COP) resin film having a thickness of 3 μm and a tensile elastic modulus of 12309MPa at 23 ℃ and 55% relative humidity and having a thickness of 13 μm and a tensile elastic modulus of 1785MPa at 23 ℃ and 55% relative humidity. The rigidity of the TS panel (2) is 42.6MPa mm.
(production of Flexible laminate)
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer having the thicknesses and storage elastic moduli at 25 ℃ described in table 1 were used, and a TS panel (2) was used instead of the TS panel (1) as the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer. The obtained flexible laminate was subjected to an impact resistance test and a bending property test. The results are shown in table 1.
[ examples 4 and 5 ]
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer having the thicknesses and the storage elastic moduli at a temperature of 25 ℃ described in table 1 were used as the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer. The obtained flexible laminate was subjected to an impact resistance test and a bending property test. The results are shown in table 1.
[ example 6, comparative example 1 ]
(preparation of touch sensor Panel (3))
The TS panel (3) was prepared by the same procedure as the TS panel (2) except that a cyclic polyolefin (COP) resin film having a thickness of 23 μm and a tensile elastic modulus of 1628MPa at a temperature of 23 ℃ and a relative humidity of 55% was used as the support layer. The rigidity of the TS panel (3) was 53.7 MPa-mm.
[ examples 7 and 8 ]
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer having the thicknesses and the storage elastic moduli at a temperature of 25 ℃ described in table 1 were used as the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer. The obtained flexible laminate was subjected to an impact resistance test and a bending property test. The results are shown in table 1.
(production of Flexible laminate)
A flexible laminate was produced by the same procedure as in example 1, except that the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer having the thicknesses and storage elastic moduli at 25 ℃ described in table 1 were used, and a TS panel (3) was used instead of the TS panel (1) as the 1 st pressure-sensitive adhesive layer and the 2 nd pressure-sensitive adhesive layer. The obtained flexible laminate was subjected to an impact resistance test and a bending property test. The results are shown in table 1.
Claims (10)
1. A flexible laminate comprising a front panel, a 1 st adhesive layer, a circularly polarizing plate, a 2 nd adhesive layer and a touch sensor panel in this order,
the relation of the following formula (1) is satisfied when the thickness of the front panel is a, the unit is μm, the thickness of the 1 st adhesive layer is b, the unit is μm, the thickness of the circularly polarizing plate is c, the unit is μm, the thickness of the 2 nd adhesive layer is d, the unit is μm, and the thickness of the touch sensor panel is e, the unit is μm,
(b+d)/(a+b+c+d+e)≥0.2 (1)。
2. the flexible laminate according to claim 1, wherein the thickness b of the 1 st adhesive layer and the thickness d of the 2 nd adhesive layer satisfy the following expression (2),
1≤b/d≤6 (2)。
3. the flexible laminate of claim 1 or 2, wherein the thickness b of the 1 st adhesive layer is greater than the thickness d of the 2 nd adhesive layer.
4. The flexible laminate according to any one of claims 1 to 3, wherein the thickness b of the 1 st adhesive layer is 10 μm or more,
the thickness d of the 2 nd adhesive layer is 10 [ mu ] m or more.
5. The flexible laminate of any one of claims 1-4, wherein the front panel has a stiffness of 90 MPa-mm to 700 MPa-mm at a temperature of 23 ℃ and a relative humidity of 55%,
the rigidity of the circularly polarizing plate at a temperature of 23 ℃ and a relative humidity of 55% is 40 MPa.mm-400 MPa.mm,
the rigidity of the touch sensor panel at a temperature of 23 ℃ and a relative humidity of 55% is 15 MPa.mm to 700 MPa.mm.
6. The flexible laminate according to any one of claims 1 to 5, wherein the 1 st adhesive layer has a storage modulus of elasticity at 25 ℃ and 50% relative humidity of 0.01MPa to 0.15MPa,
the 2 nd adhesive layer has a storage elastic modulus of 0.01MPa to 0.15MPa at a temperature of 25 ℃ and a relative humidity of 50%.
7. The flexible laminate according to any one of claims 1 to 6, wherein when a total thickness t of the front sheet thickness a, the thickness b of the 1 st adhesive layer, the thickness c of the circularly polarizing plate, the thickness d of the 2 nd adhesive layer, and the thickness e of the touch sensor panel is represented by the following formula (3),
t＝a+b+c+d+e (3)
t is 250 μm or less.
8. The flexible laminate according to any one of claims 1 to 7, wherein the front sheet is a resin film or a resin film with a hard coating layer, the resin film having a hard coating layer on at least one surface thereof.
9. The flexible laminate according to any one of claims 1 to 8, wherein the flexible laminate has a limit number of bending times of 5 ten thousand or more in a bending test.
10. An image display device comprising the flexible laminate according to any one of claims 1 to 9, wherein the front panel is disposed on a front surface.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2018-244232 | 2018-12-27 | ||
| JP2018244232 | 2018-12-27 | ||
| JP2019198786A JP6735891B2 (en) | 2018-12-27 | 2019-10-31 | Flexible laminate and image display device including the same |
| JP2019-198786 | 2019-10-31 |
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| CN111458781A true CN111458781A (en) | 2020-07-28 |
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| CN201911354058.5A Pending CN111458781A (en) | 2018-12-27 | 2019-12-25 | Flexible laminate and image display device provided with same |
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| Country | Link |
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| JP (2) | JP6735891B2 (en) |
| KR (1) | KR20200081287A (en) |
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| CN117987028A (en) * | 2019-01-17 | 2024-05-07 | 富士胶片株式会社 | Laminate and image display device |
| JP2021152650A (en) * | 2020-03-23 | 2021-09-30 | 住友化学株式会社 | Laminate |
| JP2021157101A (en) * | 2020-03-27 | 2021-10-07 | 日東電工株式会社 | Optical film having double-sided adhesive and image display device |
| JP7092900B2 (en) * | 2020-07-31 | 2022-06-28 | 住友化学株式会社 | Laminates and image display devices |
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| JP2018028573A (en) * | 2016-08-15 | 2018-02-22 | 日東電工株式会社 | Laminate for Flexible Image Display Device and Flexible Image Display Device |
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| JP2012218163A (en) * | 2011-04-04 | 2012-11-12 | Jsr Corp | Transparent conductive film, laminate, touch panel, and display |
| JP6173009B2 (en) * | 2013-03-08 | 2017-08-02 | 富士フイルム株式会社 | Liquid crystal display |
| US9835793B2 (en) * | 2014-09-12 | 2017-12-05 | Apple Inc. | Display backlight with adhesive attachment layers |
| KR101659239B1 (en) | 2014-11-01 | 2016-09-23 | 삼성에스디아이 주식회사 | Flexible display apparatus |
| KR102451081B1 (en) | 2016-02-05 | 2022-10-06 | 삼성전자주식회사 | Display using various adhesive and electronic device including the same |
| JP6904666B2 (en) * | 2016-05-17 | 2021-07-21 | 日東電工株式会社 | Optical laminate |
| KR101933765B1 (en) * | 2016-08-23 | 2018-12-28 | 동우 화인켐 주식회사 | Polarizing Plate and Image Display Device Comprising the Same |
| JP7119424B2 (en) * | 2017-03-02 | 2022-08-17 | 大日本印刷株式会社 | Optical film and image display device |
| JP6510113B2 (en) * | 2017-05-09 | 2019-05-08 | 日東電工株式会社 | Composition for optical member, optical member and image display device |
| JP6979285B2 (en) * | 2017-05-26 | 2021-12-08 | 日東電工株式会社 | Image display device |
| JP6937169B2 (en) * | 2017-06-09 | 2021-09-22 | 日東電工株式会社 | Polarizing plate with retardation layer and image display device |
| JP6768024B2 (en) * | 2018-03-26 | 2020-10-14 | リンテック株式会社 | Active energy ray-curable adhesive, adhesive sheet and laminate |
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2019
- 2019-10-31 JP JP2019198786A patent/JP6735891B2/en not_active Expired - Fee Related
- 2019-12-13 TW TW108145872A patent/TW202046076A/en unknown
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- 2019-12-25 CN CN201911354058.5A patent/CN111458781A/en active Pending
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Patent Citations (3)
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| KR20150099460A (en) * | 2014-02-21 | 2015-08-31 | 주식회사 엘지화학 | Touch panel |
| CN107710027A (en) * | 2015-06-30 | 2018-02-16 | 株式会社凸版巴川光学薄膜 | Hard coat film, Polarizer, display unit and display device using the hard coat film |
| JP2018028573A (en) * | 2016-08-15 | 2018-02-22 | 日東電工株式会社 | Laminate for Flexible Image Display Device and Flexible Image Display Device |
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| JP2020106824A (en) | 2020-07-09 |
| TW202046076A (en) | 2020-12-16 |
| JP2020177249A (en) | 2020-10-29 |
| JP6735891B2 (en) | 2020-08-05 |
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