TW202043398A - Flexible laminate and image display device having same - Google Patents

Abstract

The present invention provides a flexible laminate having excellent impact resistance and excellent bendability and an image display device provided with the flexible laminate. The flexible laminate includes a front panel, a first adhesive layer, a circularly polarizing plate, a second adhesive layer, and a touch sensor panel in this order. When the thickness of the front panel is a[mu]m, the thickness of the first adhesive layer is b[mu]m, the thickness of the circularly polarizing plate is c[mu]m, the thickness of the second adhesive layer is d[mu]m, the thickness of the touch sensor panel is e[mu]m, and the tensile modulus of elasticity of the front panel at a temperature of 23 DEG C and a relative humidity of 55% is Ea [GPa], the following relationship (1) is satisfied: {Ea * (a + b)}/(a + b + c + d + e) ≥ 1.5 (i).

Description

Flexible laminated body and image display device provided with the same

The present invention relates to a flexible laminate and an image display device provided with the same.

In the field of various image display devices such as liquid crystal display devices or organic electroluminescence (EL) display devices, flexible displays that can bend the display panel by using a flexible substrate are known. (For example, Patent Document 1, Patent Document 2). [Prior Art Literature] [Patent Literature]

[Patent Document 1] Korean Patent Publication No. 10-2016-0053788 [Patent Document 2] Korean Published Patent No. 10-2017-0093610

[The problem to be solved by the invention] A flexible substrate has excellent flexibility characteristics, but has a tendency to be inferior in impact resistance compared with glass used in conventional image display devices. On the other hand, when it is desired to improve the impact resistance of a flexible substrate, the flexibility characteristics tend to decrease.

The object of the present invention is to provide a flexible laminate having impact resistance and excellent flexibility, and an image display device including the flexible laminate. [Means to solve the problem]

The present invention provides the following flexible laminate and image display device. [1] A flexible laminate, which in turn includes a front surface plate, a first adhesive layer, a circularly polarized light plate, a second adhesive layer and a touch sensor panel, The thickness of the front surface plate is set to a [μm], the thickness of the first adhesive layer is set to b [μm], the thickness of the circular polarizing plate is set to c [μm], and the The thickness of the second adhesive layer is set to d [μm], and the thickness of the touch sensor panel is set to e [μm], and the front surface plate is set at a temperature of 23° C. and a relative humidity of 55%. When the tensile modulus of elasticity is set to Ea[GPa], the relationship of the following formula (i) is satisfied: {Ea×(a+b)}/(a+b+c+d+e)≧1.5 (i).

[2] The flexible laminate according to [1], wherein the tensile modulus Ea [GPa] of the front surface plate, the thickness b of the first adhesive layer, and the first The thickness d of the second adhesive layer satisfies the relationship of the following formula (ii): b/(Ea×d)≧0.3 (ii).

[3] The flexible laminate according to [1] or [2], wherein the front surface plate has a rigidity of 0.09 GPa·mm or more and 0.7 GPa·mm or less at a temperature of 23°C and a relative humidity of 55%, The rigidity of the circularly polarized light plate at a temperature of 23°C and a relative humidity of 55% is 40 MPa·mm or more and 400 MPa·mm or less, The rigidity of the touch sensor panel at a temperature of 23° C. and a relative humidity of 55% is 15 MPa·mm or more and 700 MPa·mm or less.

[4] The flexible laminate according to any one of [1] to [3], wherein the storage elastic modulus of the first adhesive layer at a temperature of 25° C. and a relative humidity of 50% is 0.01 MPa Above 0.15 MPa, The storage elastic modulus of the second adhesive layer at a temperature of 25° C. and a relative humidity of 50% is 0.01 MPa or more and 0.15 MPa or less.

[5] The flexible laminate according to any one of [1] to [4], wherein the thickness a of the front surface plate is represented by the following formula (iii), and the first adhesive When the total thickness t [μm] of the thickness b of the layer, the thickness c of the circularly polarizing plate, the thickness d of the second adhesive layer, and the thickness e of the touch sensor panel, t is 250 μm or less , t=a+b+c+d+e (iii).

[6] The flexible laminate according to any one of [1] to [5], wherein the front surface plate is a resin film or a hard coat with a hard coat on at least one surface of the resin film Layer of resin film.

[7] The flexible laminate according to any one of [1] to [6], wherein the limit number of bending in a bendability test in which the flexible laminate is bent on the inner side of the front surface plate is More than 50,000 times.

[8] The flexible laminate according to any one of [1] to [7], wherein the limit number of bending in a bending test in which the flexible laminate is bent on the outer side of the front surface plate is More than 50,000 times.

[9] An image display device comprising the flexible laminate according to any one of [1] to [8], and the front surface plate is arranged on the front surface. [Effects of the invention]

According to the present invention, it is possible to provide a flexible laminate having impact resistance and excellent flexibility, and an image display device including the flexible laminate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the following drawings, the scales are appropriately adjusted to make the components easy to understand, and the scales of the respective components shown in the drawings may not necessarily match the scales of the actual components.

(Flexible laminate) FIG. 1 is a schematic cross-sectional view schematically showing an example of the flexible laminate of this embodiment. The flexible laminate 100 includes a front surface plate 10, a first adhesive layer 20, a circularly polarizing plate 30, a second adhesive layer 40, and a touch sensor panel (hereinafter, sometimes referred to as "TS (Touch Sensor) panel) ") 50. As shown in FIG. 1, from the visible side, the flexible laminate 100 has a front surface plate 10, a first adhesive layer 20, a circularly polarizing plate 30, a second adhesive layer 40, and a TS panel 50 laminated in this order.

The flexible laminate 100 has flexibility, and thereby can be applied to image display devices (flexible displays) that can be bent or wound. In the flexible laminated body 100 of this embodiment, especially the front surface plate 10 side is an inner side, and the bendability (hereafter, it may be called "flexibility (in (in))") is excellent. Specifically, in the bendability (in) test of the examples described later, the flexible laminate 100 may have bendability as the limit bend for the number of bends caused by cracks in the bend region or floating of the adhesive layer The number of times is 50,000 times or more, and the limit bending number is preferably 100,000 times or more, more preferably 200,000 times or more.

In addition, in one embodiment of the flexible laminate 100, in addition to the above-mentioned flexibility (in), the front surface plate 10 side may be bent outside (hereinafter, sometimes referred to as "flexibility"). (Out (外))”) is also excellent. Specifically, the flexible laminate 100 preferably has a bendability with a limit bending number of 50,000 times or more in the bendability (out) test of the examples described later, and more preferably, the limit bending number is 100,000 times or more. Preferably, it is more than 200,000 times.

The flexible laminate 100 can constitute an image display device as described above, and in particular, it can be suitably used for a flexible display that can be bent, wound, or the like. In addition, since the flexible laminate 100 includes the circularly polarizing plate 30, it can also be used as an anti-reflection film in an organic electroluminescence (EL) display device, for example.

In the flexible laminate 100, the thickness of the front surface plate 10 is a [μm], the thickness of the first adhesive layer 20 is b [μm], and the thickness of the circularly polarizing plate 30 is c [μm] ], the thickness of the second adhesive layer 40 is set to d[μm], and the thickness of the TS panel 50 is set to e[μm], the tensile elasticity of the front surface plate at a temperature of 23°C and a relative humidity of 55% When the modulus is set to Ea[GPa], the relationship of the following formula (i) is satisfied: {Ea×(a+b)}/(a+b+c+d+e)≧1.5 (i). Hereinafter, the total thickness t [μm] of the front surface plate 10, the first adhesive layer 20, the circularly polarizing plate 30, the second adhesive layer 40, and the TS panel 50 is expressed as the following formula (iii): t=a+b+c+d+e (iii).

{Ea×(a+b)}/t in the formula (i) (here, t is represented by the formula (iii)) is preferably 1.65 or more, more preferably 1.70 or more, or 2.00 or more It may be 2.50 or more, usually 6.00 or less, 5.50 or less, 5.00 or less, or 4.50 or less.

The flexible laminate 100 is installed in an image display device so that the front surface plate 10 side is the front surface side (the visible side). Therefore, from the viewpoint of the impact resistance of the flexible laminate 100, the thickness a of the front surface plate 10 on the front surface side of the image display device and the thickness b of the first adhesive layer 20 are preferably large. In addition, from the viewpoint of the impact resistance of the flexible laminate 100, the above-mentioned tensile modulus Ea of the front surface plate 10 is also preferably large. On the other hand, from the viewpoint of the flexibility of the flexible laminate 100, the total thickness t represented by the above formula (iii) is preferably small. Therefore, in the flexible laminate 100, in order to achieve both impact resistance and bendability, it is considered that {Ea×(a+b)}/t in the above-mentioned formula (i) should be reduced in the denominator and larger in the numerator.

By making the flexible laminate 100 satisfy the relationship of the above-mentioned formula (i), it is possible to obtain a flexible laminate that can obtain good impact resistance, and in particular, the front surface plate 10 side is curved inwardly and has excellent flexibility (in)体100。 Body 100.

The total thickness t shown in the above formula (iii) is not particularly limited. However, in recent years, image display devices have advanced in thinning and weight reduction, and there is also a demand for thinning and weight reduction of components used in image display devices. , It is required to reduce the thickness of the flexible laminate 100. Therefore, the flexible laminate 100 is also required to correspond to thinning, and its thickness is preferably 250 μm or less, more preferably 220 μm or less, and may be 200 μm or less, 180 μm or less, or 150 μm or less. Usually it is 40 μm or more, but it may be 70 μm or more.

The flexible laminate 100 preferably satisfies the following formula (iv): (B+d)/t≧0.5 (iv). (B+d)/t in the above formula (iv) is more preferably 0.5 or more, still more preferably 0.6 or more, may be 0.65 or more, usually 0.9 or less, and may be 0.8 or less. Since the flexible laminated body 100 satisfies the relationship of formula (iv), in the flexible laminated body 100, the first adhesive layer 20 and the second adhesive layer 40 can be formed with a certain thickness or more. Thereby, the flexibility of the flexible laminate 100 can be ensured, and the impact absorption of the entire flexible laminate 100 can be improved, thereby improving the impact resistance.

In the flexible laminate 100, the tensile modulus Ea of the front surface plate 10, the thickness b of the first adhesive layer 20, and the thickness d of the second adhesive layer 40 preferably satisfy the following formula (ii) Relationship: b/(Ea×d)≧0.3 (ii). B/(Ea×d) in the formula (ii) is preferably 0.40 or more, more preferably 0.50 or more, in addition, usually 3.0 or less, preferably 2.5 or less, more preferably 2.0 or less, or 1.8 the following.

The flexible laminate 100 has flexibility. From the viewpoint of imparting good bendability (in) and bendability (out) to the flexible laminate 100, the thickness d of the second adhesive layer 40 is preferably small (that is, b/d is large). In addition, when the shear stress at the time of bending the flexible laminated body 100 is reduced, the flexible laminated body 100 is easily bent. Therefore, the tensile modulus Ea of the front surface panel 10 is preferably small (ie, 1/Ea is large). Therefore, in order to improve the bendability (in) and the bendability (out) of the flexible laminate 100, it is considered that the denominator should be reduced and the numerator increased in b/(Ea×d) of the above-mentioned formula (ii).

When the flexible laminate 100 satisfies the relationship of the formula (ii), in addition to the bendability (in), the bendability (out) in which the front surface plate 10 side can be bent outward is particularly excellent.

In the flexible laminate 100, the thickness b of the first adhesive layer 20 and the thickness d of the second adhesive layer 40 preferably satisfy the relationship of the following formula (v): 0.5≦b/d≦7 (v) Since the thickness b of the first adhesive layer 20 is preferably greater than the thickness d of the second adhesive layer 40, b/d in the formula (v) is more preferably 1 or more, and more preferably 1.5 or more, which can be 2 or more, but also 3 or more. In addition, b/d in the formula (v) is preferably 6 or less, more preferably 5.5 or less, and may be 5 or less. By setting the thickness b of the first adhesive layer 20 and the thickness d of the second adhesive layer 40 in the relationship of the above formula (v), in particular, the flexibility of the front surface plate 10 side bent inside is excellent. Sex laminate 100.

The shape of the flexible laminate 100 in the plane direction is not particularly limited, but it 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 50 mm to 300 mm, or 100 mm to 280 mm, and the length of the short side is, for example, preferably 30 mm to 250 mm, or may be 60 mm～220 mm. The flexible laminated body 100 may have a rounded square shape obtained by performing R processing on at least one of the corners of the square shape, or may have a square shape having a notch on at least one side. In addition, the flexible laminate 100 may be provided with a hole penetrating in the laminate direction.

(Front panel) The front surface plate 10 can function as a layer for protecting the display elements of an image display device, etc., and is a plate-shaped body capable of transmitting light. Generally, the plate-shaped body is preferably made of glass or resin. The front surface plate 10 may be arranged on the outermost surface of the image display device. The front surface plate 10 is preferably a resin film or a hard coat resin film with a hard coat layer provided on at least one surface of the resin film to further increase the hardness. In addition, the front surface plate 10 may have a blue light blocking function, a viewing angle adjustment function, and the like.

The resin film forming the front surface plate 10 is not limited as long as it is a resin film capable of transmitting light. For example, a film containing the following polymers can be cited: triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, acrylic cellulose, butyl cellulose, acetyl cellulose, poly Ester, polystyrene, polyamide, polyetherimide, poly(meth)acrylic acid, polyimide, polyether turpentine, polysulfide, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride , Polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether ether, poly(methyl)acrylate, polyethylene terephthalate, poly(terephthalate) Butylene dicarboxylate, polyethylene naphthalate, polycarbonate, polyimide, etc. The polymer can be used alone or in combination of two or more kinds. When the image display device 300 is a flexible display, it is preferable to use a resin film formed of a polymer such as polyimide, polyimide, polyimide imide, etc., which can be configured to have excellent flexibility , And can have high strength and high transparency.

The resin film with a hard coat layer constituting the front surface plate 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 sides, the composition and thickness of each hard coat layer may be the same or different from each other. Compared with a resin film without a hard coat layer, a resin film with a hard coat layer can improve hardness and scratch resistance.

The hard coat layer of the resin film with a hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of ultraviolet curable resins include monofunctional (meth)acrylic resins, polyfunctional (meth)acrylic resins, and polyfunctional (meth)acrylic resins having a dendritic polymer structure (meth) ) Acrylic resin; silicone resin; polyester resin; urethane resin; amide resin; epoxy resin, etc. In order to increase the strength, the hard coat layer may contain additives. The additives are not limited, and include inorganic fine particles, organic fine particles, or a mixture of these.

The rigidity of the front surface plate 10 at a temperature of 23° C. and a relative humidity of 55% is preferably 0.090 GPa·mm or more, more preferably 0.12 GPa·mm or more, still more preferably 0.2 GPa·mm or more, and still more preferably 0.25 GPa·mm mm or more, and preferably 0.7 GPa·mm or less, may be 0.6 GPa·mm or less, or may be 0.5 GPa·mm or less. When the rigidity of the front surface plate 10 decreases, the flexibility of the flexible laminate 100 increases, while impact resistance tends to decrease. When the rigidity of the front surface plate 10 increases, the impact resistance of the flexible laminate 100 Improved performance, on the other hand, there is a tendency for flexibility to decrease. In addition, when the rigidity of the front surface plate 10 is within the above-mentioned range, the flexible laminate 100 satisfies the relationship of the above-mentioned formula (i) or the above-mentioned formula (i) and formula (ii). The flexible laminate 100 having impact resistance and excellent flexibility is obtained.

The rigidity of the front surface plate 10 can be determined by the product (Ea) of the tensile elastic modulus Ea [GPa] of the entire front surface plate 10 at a temperature of 23° C. and a relative humidity of 55% and the thickness [mm] of the entire front surface plate 10 [GPa]×a[μm]×10 ^-3 ) to calculate. The thickness a of the front surface plate 10 may be, for example, 30 μm or more and 200 μm or less, preferably 50 μm or more and 150 μm or less, more preferably 50 μm or more and 100 μm or less, and may be 90 μm or less. The tensile elastic modulus Ea of the front surface plate 10 is, for example, preferably 1 GPa or more, more preferably 2 GPa or more, still more preferably 3 GPa or more, and more preferably 30 GPa or less, more preferably 20 GPa or less, and further Preferably, it is 10 GPa or less.

(The first adhesive layer) The first adhesive layer 20 is a layer for bonding the front surface plate 10 and the circularly polarizing plate 30, and can be formed using an adhesive composition. The thickness b of the first adhesive layer 20 is not particularly limited as long as it satisfies the relationship between the formula (i) and the formula (ii), but is preferably 5 μm or more, more preferably 7 μm or more, and more preferably It is 10 μm or more, may be 20 μm or more, or may be 30 μm or more. In addition, it is usually 200 μm or less, preferably 100 μm or less, and more preferably 80 μm or less.

The storage elastic modulus Gb of the first adhesive layer 20 at a temperature of 25° C. and a relative humidity of 50% is preferably 0.005 MPa or more, may be 0.007 MPa or more, or may be 0.01 MPa or more, and more preferably 0.2 MPa or less, It can be 0.17 MPa or less, or 0.15 MPa or less.

When the storage elastic modulus Gb of the first adhesive layer 20 becomes smaller, the impact resistance of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gb of the first adhesive layer 20 becomes larger, the flexible laminate 100 There is a tendency to decrease the bending properties. In addition, when the storage elastic modulus Gb of the first adhesive layer 20 is within the above range, the flexible laminate 100 satisfies the relationship of the above formula (i) or the above formulas (i) and (ii), It is possible to preferably obtain the flexible laminate 100 having impact resistance and excellent flexibility.

The first adhesive layer 20 may include an adhesive composition mainly composed of (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resins. Among them, an adhesive composition using a (meth)acrylic resin excellent in transparency, weather resistance, heat resistance, etc., as a base polymer is preferred. The adhesive composition can be an active energy ray hardening type or a thermal hardening type.

As the (meth)acrylic resin (base polymer) used in the adhesive composition, for example, butyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate can be preferably used. One or two or more of (meth)acrylates such as octyl ester and 2-ethylhexyl (meth)acrylate are polymers or copolymers as monomers. The base polymer is preferably copolymerized with a polar monomer. Examples of polar monomers include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, N,N-dimethyl Monomers such as ethyl (meth)acrylate and glycidyl (meth)acrylate, which have a carboxyl group, a hydroxyl group, an amide group, an amino group, and an epoxy group.

The adhesive composition may only contain the base polymer, but usually contains a crosslinking agent. Examples of the crosslinking agent include: a metal ion having a valence of two or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; a polyepoxy compound or Polyols, which form ester bonds with carboxyl groups; polyisocyanate compounds, which form amide bonds with carboxyl groups. Among them, polyisocyanate compounds are preferred.

The so-called active energy ray curable adhesive composition refers to the following adhesive composition, which has the property of being irradiated with active energy rays such as ultraviolet rays or electron rays, and has the property of curing, and thus has adhesiveness before the active energy rays are irradiated It can be closely adhered to adherends such as films, and can be cured by the irradiation of active energy rays to adjust the properties of adhesion. The active energy ray curable adhesive composition is preferably an ultraviolet curable adhesive composition. The active energy ray curable adhesive composition contains an active energy ray polymerizable compound in addition to the raw material polymer and crosslinking agent. In addition, if necessary, a photopolymerization initiator, photosensitizer, etc. are also contained.

The adhesive composition may contain fine particles, beads (resin beads, glass beads, etc.), glass fibers, resins other than raw polymer, tackifiers, fillers (metal powder or other inorganic powders, etc.) for imparting light scattering properties. , Antioxidants, UV absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators and other additives.

The first adhesive layer 20 can be formed by coating the organic solvent diluent of the adhesive composition on a substrate and drying it.

(Circularly polarized light plate) The circular polarizing plate 30 may include a linear polarizing plate 31 and a retardation layer 32. The linear polarizing plate 31 may be arranged on the side of the first adhesive layer 20 and the retardation layer 32 may be arranged on the side of the second adhesive layer 40. The circularly polarizing light plate 30 can convert the light emitted through the flexible laminate 100 from the display element side of the image display device having the flexible laminate 100 into circularly polarized light. In addition, the circularly polarizing plate 30 can suppress the emission of reflected light of external light, and therefore can provide the flexible laminated body 100 with a function as an anti-reflection film.

The rigidity of the circularly polarizing plate 30 at a temperature of 23° C. and a relative humidity of 55% is preferably 40 MPa·mm or more, may be 80 MPa·mm or more, or may be 100 MPa·mm or more, and more preferably 700 MPa·mm. mm or less, can be 600 MPa·mm or less, 500 MPa·mm or less, 400 MPa·mm or less, 200 MPa·mm or less, or 100 MPa·mm or less. When the rigidity of the circularly polarizing plate 30 decreases, the flexibility of the flexible laminate 100 increases. On the other hand, the impact resistance tends to decrease. When the rigidity of the circularly polarizing plate 30 increases, the impact resistance of the flexible laminate 100 On the other hand, the flexibility tends to decrease. In addition, when the rigidity of the circularly polarizing plate 30 is within the above-mentioned range, the flexible laminate 100 satisfies the relationship of the above-mentioned formula (i) or the above-mentioned formula (i) and the above-mentioned formula (ii), which can be better Thus, a flexible laminate 100 having impact resistance and excellent flexibility is obtained.

The rigidity [MPa·mm] of the circularly polarizing plate 30 can be determined by the tensile elastic modulus Ec [MPa] of the entire circularly polarizing plate 30 at a temperature of 23°C and a relative humidity of 55% and the thickness of the entire circularly polarizing plate 30 [mm ] Product (Ec[MPa]×c[μm]×10 ^-3 ).

(Linear polarizing plate) The linear polarizing plate 31 has a function of selectively transmitting linearly polarized light in one direction from non-polarized light such as natural light. Examples of the linear polarizing plate 31 include films including the following films as a polarizer, namely, a stretched film that adsorbs a pigment having absorption anisotropy, or a film obtained by coating and curing a pigment having absorption anisotropy. . Examples of dyes having absorption anisotropy include dichroic dyes. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. Dichroic organic dyes include dichroic direct dyes containing C.I. Direct Red 39 and other bisazo compounds, and dichroic direct dyes containing compounds such as trisazo and tetraazo. Examples of films coated with pigments having absorption anisotropy used as polarizers include stretched films adsorbed with pigments having absorption anisotropy, or films having the following layers, that is, coatings containing A composition of a liquid crystal dichroic dye or a layer obtained by curing a composition containing a dichroic dye and a polymerizable liquid crystal. Compared with the stretched film which adsorbs the pigment|dye which absorbs anisotropy, the film which apply|coated and hardened the pigment|dye which absorbs anisotropy has no limitation in the bending direction, and is preferable.

(Polarizing plate with stretched film as a polarizer) The linear polarizing plate provided with the stretched film which adsorb|sucks the dye which has absorption anisotropy as a polarizing plate is demonstrated. As a polarizer, a stretched film that absorbs a pigment with absorption anisotropy is usually manufactured through the following steps: a step of uniaxially stretching a polyvinyl alcohol-based resin film; by using a dichroic pigment to treat polyvinyl alcohol The step of dyeing the resin film to adsorb the dichroic pigment; and the step of treating the polyvinyl alcohol resin film with the dichroic pigment adsorbed by the boric acid aqueous solution, and the step of washing with water after the treatment with the boric acid aqueous solution step. The polarizer can be directly used as a linear polarizing plate, or a transparent protective film can be laminated on one or both sides of the polarizer as a linear polarizing plate. The thickness of the polarizing plate thus obtained is preferably 2 μm to 40 μm.

The polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based 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 other monomers copolymerizable therewith is used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.

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

After forming such a polyvinyl alcohol-based resin into a film, it can be used as a raw material film of a polarizing plate. The method of forming a polyvinyl alcohol-based resin into a film is not particularly limited, and a known method can be used for forming a film. The film thickness of the polyvinyl alcohol-based raw material film may be, for example, about 10 μm to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, during or after dyeing with a dichroic dye. In the case of performing uniaxial stretching after dyeing, the uniaxial stretching may be performed before the boric acid treatment or may be performed during the boric acid treatment. In addition, uniaxial stretching may be performed in the multiple stages described above. In the case of uniaxial stretching, it can be uniaxially stretched between rolls with different peripheral speeds, or can be uniaxially stretched using a heated roll. In addition, uniaxial stretching can be either dry stretching or wet stretching, where dry stretching is stretched in the air, and wet stretching uses a solvent to swell the polyvinyl alcohol resin film. Stretched in the same state. The stretching ratio is usually about 3 to 8 times.

The thickness of a linear polarizing plate equipped with a stretched film as a polarizer may be, for example, 1 μm or more and 100 μm or less, 5 μm or more, 7 μm or more, and 700 μm or less, or 50 μm Hereinafter, it may be 20 μm or less or 10 μm or less. The linear polarizing plate provided with a stretched film as a polarizer may have a tensile modulus of elasticity at a temperature of 25° C., for example, from 1 GPa to 20 GPa.

The material of the protective film laminated on one or both sides of the polarizer is not particularly limited, and examples include cyclic polyolefin resin films, triacetyl cellulose, diacetyl cellulose, and other resin-containing acetic acid. Cellulose resin films, polyester resin films containing resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate resin films, A (meth)acrylic resin film, a polypropylene resin film, and other films known in the art. 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 equipped with a film containing a liquid crystal layer as a polarizing plate) The linear polarizing plate provided with the film containing a liquid crystal layer as a polarizing plate is demonstrated. Examples of a film coated with a pigment having absorption anisotropy used as a polarizer include: a composition containing a dichroic pigment having liquid crystallinity, or a coating of a composition containing a dichroic pigment and a liquid crystal compound Film etc. obtained by curing on a substrate. The film can be used as a linear polarizing plate by peeling off the base material or together with the base material, or can also be used as a linear polarizing plate with a structure having a protective film on one or both sides thereof. As this protective film, the same protective film as the linear polarizing plate provided with the said stretched film as a polarizing plate is mentioned.

Specific examples of the film obtained by coating the pigment having absorption anisotropy include the films described in Japanese Patent Laid-Open No. 2013-37353 or Japanese Patent Laid-Open No. 2013-33249.

It is preferable that the film obtained by coating and hardening the pigment having absorption anisotropy is thin, but when it is too thin, the strength decreases and the workability tends to deteriorate. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less. The thickness of a linear polarizing plate equipped with a film containing a liquid crystal layer as a polarizing plate can be, for example, 1 μm or more and 50 μm or less. A linear polarizing plate equipped with a film containing a liquid crystal layer as a polarizing plate is stretched at a temperature of 23°C and a relative humidity of 55%. The modulus of elasticity may be 0.5 GPa or more and 5 GPa or less, for example.

(Retardation layer) The retardation layer 32 may be one layer, or two or more layers. In addition, it may have an overcoat to protect the surface of the retardation layer, or a base film that supports the retardation layer. The retardation layer 32 includes a λ/4 layer, and may further include a λ/2 layer or a positive C layer. When the retardation layer 32 includes a λ/2 layer, a λ/2 layer and a λ/4 layer are laminated in this order from the linear polarizing plate 31 side. In the case where the retardation layer 32 includes a positive C layer, a λ/4 layer and a positive C layer may be laminated in order from the linear polarizing plate 31 side, or a positive C layer and a λ/4 layer may be laminated in order from the linear polarizing plate 31 side. .

The retardation layer 32 may include a resin film exemplified as a material of the protective film, or may include a layer cured by a polymerizable liquid crystal compound. The retardation layer 32 may further include an alignment film or a base film, and may have a bonding layer for bonding the λ/4 layer and the λ/2 layer. The bonding 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-based resin aqueous solutions, aqueous two-component urethane emulsion adhesives, and the like; active curing by irradiating active energy rays such as ultraviolet rays Energy ray curable adhesive composition, etc.

The overall thickness of the retardation layer may be, for example, 1 μm or more and 50 μm or less. (Second adhesive layer) The second adhesive layer 40 is a layer for bonding the circularly polarizing plate 30 and the TS panel 50, and can be formed using an adhesive composition. The thickness d of the second adhesive layer 40 is not particularly limited as long as it satisfies the relationship between the formula (i) and the formula (ii), but it is preferably 5 μm or more, may be 10 μm or more, or 15 μm or more, but also 20 μm or more. In addition, it is usually 100 μm or less, preferably 80 μm or less, and more preferably 60 μm or less.

The storage elastic modulus Gb of the second adhesive layer 40 at a temperature of 25° C. and a relative humidity of 50% is preferably 0.01 MPa or more, may be 0.02 MPa or more, may also be 0.03 MPa or more, or may be 0.05 MPa or more. , Preferably 0.2 MPa or less, 0.15 MPa or less, 0.12 MPa or less, or 0.10 MPa or less.

When the storage elastic modulus Gd of the second adhesive layer 40 becomes smaller, the impact resistance of the flexible laminate 100 tends to decrease. When the storage elastic modulus Gd of the second adhesive layer 40 becomes larger, the flexible laminate 100 Flexibility tends to decrease. In addition, when the storage elastic modulus Gd of the second adhesive layer 40 is within the range, the flexible laminate 100 satisfies the formula (i) or the formula (i) and the formula In relation to (ii), it is possible to preferably obtain the flexible laminate 100 having impact resistance and excellent flexibility.

As the adhesive composition constituting the second adhesive layer 40, the adhesive composition exemplified as the adhesive composition constituting the first adhesive layer 20 can be used. The adhesive composition constituting the second adhesive layer 40 may be the same as or different from the adhesive composition constituting the first adhesive layer 20. In addition, the formation of the second adhesive layer 40 may be performed in the same manner as the formation of the first adhesive layer 20.

(Touch sensor panel) As long as the TS panel 50 is a sensor capable of detecting the touched position, the detection method is not limited, and examples thereof include resistive film method, electrostatic capacitance coupling method, optical sensor method, ultrasonic method, electromagnetic induction coupling method, TS panel of surface acoustic wave method etc. From the viewpoint of low cost, it is preferable to use a resistive film method or an electrostatic capacitance coupling method TS panel.

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

An example of a TS panel of the electrostatic capacitance coupling method includes a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit. In the image display device provided with the TS panel of the electrostatic capacitance coupling method, when the surface of the front panel 10 is touched, at the touched point, the transparent electrode is grounded via the electrostatic capacitance of the human body. The touch position detection circuit detects the grounding of the transparent electrode, thereby detecting the touched position.

The TS panel 50 may only include a touch sensor pattern layer, or may include a touch sensor pattern layer and a support layer supporting the touch sensor pattern layer. When the TS panel 50 includes a touch sensor pattern layer and a support layer, the two can be joined together by a lamination layer, or the touch sensor pattern layer can be formed on the support layer without the lamination layer. The bonding 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 of the TS panel 50 may include conductive layers such as electrodes and wires. It is preferable that the conductive layer is formed in the form of the TS panel 50 and is not recognized when it is used in a flexible laminate. The touch sensor pattern layer may include a separation layer. The separation layer is provided for the purpose of forming on a substrate such as glass, and separating 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 forming the inorganic layer include silicon oxide. As a material for forming the organic layer, for example, a (meth)acrylic resin composition, an epoxy resin composition, a polyimide resin composition, etc. can be used. The touch sensor pattern layer may further include at least one protective layer. The protective layer may be provided in contact with the conductive layer to support the conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and the film can be formed by a spin coating method, a sputtering method, an evaporation method, or the like. The conductive layer may be a transparent conductive layer containing metal oxides such as indium tin oxide (ITO), or a metal layer containing metals such as aluminum or copper, silver, and gold. In addition, the touch sensor pattern layer may only include conductive layers such as electrodes and wires. The support layer is preferably a resin film, for example, polyester resin films such as cyclic olefin resin films, polyethylene terephthalate resin films, acrylic resin films, triacetyl cellulose resin films, etc. can be used .

The rigidity of the TS panel 50 at a temperature of 23°C and a relative humidity of 55% is preferably 15 MPa·mm or more, may be 50 MPa·mm or more, or may be 100 MPa·mm or more, and more preferably 700 MPa·mm Below, it may be 600 MPa·mm or less, or 500 MPa·mm or less. When the rigidity of the TS panel 50 decreases, the flexibility of the flexible laminate 100 improves. On the other hand, the impact resistance tends to decrease. When the rigidity of the TS panel 50 increases, the impact resistance of the flexible laminate 100 improves On the other hand, the flexibility tends to decrease. In addition, when the rigidity of the TS panel 50 is within the above-mentioned range, the flexible laminate 100 satisfies the relationship between the above-mentioned formula (i), or the above-mentioned formula (i) and formula (ii), it can be preferably obtained The flexible laminate 100 has good impact resistance and excellent flexibility.

The rigidity [MPa·mm] of the TS panel 50 can be determined by the product (Ee) of the tensile elastic modulus Ee [MPa] of the TS panel 50 at a temperature of 23°C and a relative humidity of 55% and the thickness [mm] of the TS panel 50. [MPa]×e[μm]×10 ^-3 ) to calculate. The thickness e of the TS panel 50 may be, for example, 3 μm or more and 100 μm or less, may be 5 μm or more and 50 μm or less, may be 5 μm or more and 30 μm or less, or may be 5 μm or more and 20 μm or less. The tensile modulus Ee of the touch sensor panel can be, for example, 1 GPa or more and 7 GPa or less, or can be 1.2 GPa or more and 6 GPa or less.

(Image display device) FIG. 2 is a schematic cross-sectional view schematically showing an example of the image display device of this embodiment. The image display device 300 has a flexible laminate 100 including a front surface plate 10 arranged on the front surface (visible side) of the image display device 300, a display laminate 200 including a display unit, and an adhesive layer 60. On the circularly polarizing plate 30 side of the sexual laminate 100, the display laminate 200 is laminated via the bonding layer 60. The image display device 300 can be a touch panel display device because the flexible laminate 100 includes the TS panel 50.

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 surface of the front surface plate 10 is inside and can be folded, or may be configured such that the surface of the front surface plate 10 is inside and can be wound.

The bonding layer 60 is used for bonding the circularly polarizing plate 30 and the display laminated body 200 in the flexible laminated body 100. When the flexible laminate 100 and the display laminate 200 are laminated, for example, a bonding layer 60 may be provided on the circularly polarizing plate 30 of the flexible laminate 100, and the display laminate 200 may be laminated on the bonding layer 60. The bonding layer 60 is an adhesive layer or an adhesive layer, and can be formed using the adhesive composition and the adhesive composition.

Examples of the display unit included in the display laminate 200 include display units including display elements such as liquid crystal display elements, organic EL display elements, inorganic EL display elements, plasma display elements, and field emission display elements.

The image display device 300 can be used as mobile devices such as smart phones, input boards, televisions, digital photo frames, electronic billboards, measuring instruments or measuring instruments, office equipment, medical equipment, computer equipment, and the like. [Example]

Hereinafter, the present invention will be explained in more detail with examples, but the present invention is not limited by these examples. Unless otherwise specified, "%" and "parts" in the examples and comparative examples are mass% and mass parts.

[Measurement of thickness] The thickness of each layer forming the flexible laminate is performed in the following order. A laser cutter was used to cut the flexible laminate, a transmission electron microscope (SU8010, manufactured by Horiba Manufacturing Co., Ltd.) was used to observe the cross section of the cut flexible laminate, and the obtained observation image was used to measure the formation of the flexible laminate The thickness of each layer.

[Determination of Tensile Modulus] At a temperature of 23° C. and a relative humidity of 55%, a tensile tester (AG-1S, manufactured by Shimadzu Corporation) was used to measure the tensile modulus of elasticity. When the measurement object is a retardation layer, the tensile modulus of elasticity in the retardation phase axis direction is measured.

[Calculation of rigidity] The rigidity is calculated by calculating the product of the measured thickness value and the tensile elastic modulus value.

[Determination of storage elastic modulus] For the measurement sample formed by laminating each adhesive layer (first adhesive layer or second adhesive layer) with a thickness of 150 μm, a rheometer (Anton Parr, MCR-301) was used, The storage elastic modulus (Gb, Gd) was measured under the conditions of temperature 25℃, relative humidity 50%, stress 1%, and frequency 1 Hz.

[Impact resistance test] On glass (Soda Glass 1.1T, manufactured by JMC Glass Co., Ltd.), an optical adhesive sheet (8146-04, manufactured by 3M Co., Ltd.) with a thickness of 100 μm was used to fix the flexible laminates obtained in each example and comparative example. On the touch sensor panel side of the body, prepare a sample for evaluation. The sample for evaluation is installed on the impact resistance test device (Drop Tester, manufactured by TAEWON TECH CO.) with the front surface of the sample facing upwards. At a position 5 cm above the surface, the test ball was allowed to fall freely, and an impact resistance test for collision with the evaluation sample was performed at a temperature of 25°C. The impact resistance test was performed while changing the weight of the test ball, and the weight of the test ball when the glass at the lower part of the evaluation sample was broken was determined. The impact resistance was evaluated in the following manner: The weight of the test ball when the glass of the evaluation sample was broken was The case over 100g is evaluated as A, The case of 50g or more and less than 100g is evaluated as B, The case of less than 50g was evaluated as C.

[Bending test] (1) Flexibility (in) test In order to evaluate the bendability (in) of the inner side of the front surface plate at a temperature of 25°C, a bendability (in) test was performed in the following order. In a bending tester (CFT-720C, manufactured by Covotech), the flexible laminate obtained in each of the Examples and Comparative Examples was set in a flat state (unbent state) so that the front surface plate The flexible laminate is bent so that the distance between the facing front panels when the side is inside is 4.0 mm, and then the bending operation is performed to return to the original flat state. When this bending operation is performed once, it is counted as the number of bending once, and the bending operation is repeated. It was confirmed that the number of bending times when cracks occurred in the bending area or the adhesive layer floated during the bending operation was used as the limit bending number. The evaluation of the bendability (in) test is performed in the following manner: the occurrence of cracks in the bent area or the floating of the adhesive layer during the bending operation The case where it is not visible even if the number of bending reaches 200,000 times is evaluated as A, When the number of bending is more than 100,000 times and less than 200,000 times, it is evaluated as B. When the number of bending times is 50,000 times or more and less than 100,000 times, it is evaluated as C, When the number of bending times is less than 50,000 times, it is evaluated as D.

(2) Flexibility (out) test In order to evaluate the bending property (out) of the front panel side as the outer side, when the flexible laminate is bent with the front panel side as the outer side, the bending is performed so that the distance between the TS panel sensors is 4.0 mm Except for the bending operation of the flexible laminate, the bending operation was repeated in the same procedure as the above (1) Flexibility (in) test, and the limit bending frequency was confirmed. The evaluation of the bendability (out) test was also performed in the same manner as the evaluation of the bendability (in) test.

[Example 1] (Preparation of front panel) As the front surface plate, a hard-coated resin film with a thickness of 60 μm in which a hard-coated layer was formed on one side of the resin film was prepared. The resin film is a polyimide-based resin film having a thickness of 50 μm, and the hard coat layer is a layer of a composition containing a dendrimer compound having a polyfunctional acrylic group at the end and having a thickness of 10 μm.

(Preparation of the first adhesive layer) The acrylic adhesive composition is coated on the release film and dried to prepare the first adhesive layer with the release film on which the first adhesive layer is formed. The thickness of the first adhesive layer is 50 μm, and the storage elastic modulus Gb at a temperature of 25° C. and a relative humidity of 50% is 0.09 MPa.

(Preparation of circular polarizing plate) Prepare a polyvinyl alcohol (PVA) film with an average degree of polymerization of about 2,400, a degree of saponification of 99.9 mol% or more, and a thickness of 20 μm. After the PVA film is immersed in pure water at 30°C, it is immersed in an aqueous solution with a mass ratio of iodine/potassium iodide/water of 0.02/2/100 at 30°C to perform iodine dyeing (iodine dyeing step). The PVA film that has undergone the iodine dyeing step is immersed in an aqueous solution with a mass ratio of potassium iodide/boric acid/water of 12/5/100 at 56.5° C. and subjected to boric acid treatment (boric acid treatment step). The PVA film that has undergone the boric acid treatment step is washed with pure water at 8° C., and then dried at 65° C. to obtain a polarizing plate with iodine adsorption aligned to polyvinyl alcohol. The stretching of the PVA film is performed in the iodine dyeing step and the boric acid treatment step. The total stretching ratio of the PVA film is 5.3 times. The thickness of the obtained polarizing plate was 7 μm.

The polarizer and 13 μm thick Cyclo Olefin Polymer (COP) film (ZF-14, manufactured by ZEON Co., Ltd., in-plane retardation value at a wavelength of 550 nm) 1 nm) Pasting with nip rolls via water-based adhesive. While maintaining the tension of the obtained laminate at 430 Nm, it was dried at 60°C for 2 minutes to obtain a linear polarizing plate having a COP film on one side. In addition, the water-based adhesive is made by adding 3 parts of carboxyl modified polyvinyl alcohol ("Kuraray poval (Kuraray poval) KL318", manufactured by Kuraray Co., Ltd.) and 1.5 parts of water-soluble polyvinyl alcohol to 100 parts of water. Amine epoxy resin ("SUMIREZ RESIN 650" (aqueous solution with a solid content of 30%), manufactured by Taoka Chemical Industry Co., Ltd.).

On the polarizing plate side of the linear polarizing plate obtained as described above, a retardation film is laminated via an adhesive. The retardation film is formed by bonding a λ/2 layer and a λ/4 layer with an ultraviolet curable adhesive. The λ/2 layer has a hardened liquid crystal compound layer and an alignment film, and has a thickness of 3 μm. The thickness of the adhesive layer is 5 μm, and the storage elastic modulus is 0.6 MPa at a temperature of 25°C and a relative humidity of 50%. The λ/4 layer has a hardened liquid crystal compound layer and an alignment film, and has a thickness of 2 μm.

(Preparation of the second adhesive layer) The acrylic adhesive composition was coated on the release film and dried to prepare the second adhesive layer with the release film on which the second adhesive layer was formed. The thickness of the second adhesive layer is 10 μm, and the storage elastic modulus Gd at a temperature of 25° C. and a relative humidity of 50% is 0.1 MPa.

(Preparation of touch sensor panel) Prepare the touch sensor pattern layer as the TS panel. The touch sensor pattern layer contains an ITO layer as a transparent conductive layer and a hardened layer of acrylic resin composition as a separation layer. The thickness is 7 μm, and the tensile modulus of elasticity at 23°C and relative humidity is 55%. 4510 MPa. The rigidity of the TS panel is 31.6 MPa·mm.

(Production of flexible laminate) One surface of the front surface plate and the surface on the first adhesive layer side of the first adhesive layer with the release film were corona treated, and the corona treated surfaces were bonded to each other. Next, corona treatment was performed on the exposed surface of the release film adhered to the first adhesive layer and the surface of the circular polarizing plate on the linear polarizing plate side, and the corona treated surfaces were bonded to each other to obtain a front surface plate and a circle A composite of polarizing plates. Next, the surface on the λ/4 layer side of the composite and the surface on the second adhesive layer side of the second adhesive layer with a release film were corona treated, and the corona treated surfaces were bonded to each other. Next, corona treatment was performed on the surface exposed by peeling off the release film adhered to the second adhesive layer, and the corona treatment surface was bonded to the transparent conductive layer side of the TS panel to obtain a flexible laminate. Furthermore, the corona treatments performed above were all performed with a frequency of 20 kHz, a voltage of 8.6 kV, a power of 2.5 kW, and a speed of 6 m/min.

In the obtained flexible laminate, the total thickness t [μm] of the front surface plate 10, the first adhesive layer 20, the circularly polarizing plate 30, the second adhesive layer 40, and the TS panel 50 (as shown in the formula (iii)) The indicated thickness) is 157 μm, length 177 mm × width 105 mm. An impact resistance test, a bendability (in) test, and a bendability (out) test were performed on the flexible laminate. The results are shown in Table 1.

[Example 2 to Example 9, Comparative Example 1] As the first adhesive layer and the second adhesive layer, those having the thickness described in Table 1 and the storage elastic modulus at a temperature of 25°C were used. As the front surface plate, a resin film having the thickness described in Table 1 was used. For those having a hard coat layer having the thickness described in Table 1, a flexible laminate was produced in the same procedure as in Example 1, except that the thickness and rigidity described in Table 1 were used as the TS panel. The resin films used in the front surface plate are all polyimide resin films, and the hard coat layers used in the front surface plate are all layers formed of a composition containing a dendrimer compound having a polyfunctional acrylic group at the terminal. An impact resistance test, a bendability (in) test, and a bendability (out) test were performed on the obtained flexible laminate. The results are shown in Table 1.

[Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative example 1 Front panel Thickness a[μm] 60 40 60 80 60 60 60 60 60 80 Thickness of resin film [μm] 50 30 50 70 50 50 50 50 50 70 Thickness of hard coat [μm] 10 10 10 10 10 10 10 10 10 10 Tensile modulus Ea[GPa] 3 3 6 3 5 3 5 5 5 3 Rigidity [GPa·mm] 0.18 0.12 0.36 0.24 0.30 0.18 0.30 0.30 0.30 0.24 First adhesive layer Thickness b[μm] 50 50 75 50 50 50 50 50 25 10 Storage elastic modulus [MPa] 0.09 0.09 0.05 0.09 0.05 0.15 0.15 0.02 0.13 0.09 Circularly polarized light plate Thickness c[μm] 30 30 30 30 30 30 30 30 30 30 Rigidity [MPa·mm] 73 73 73 73 73 73 73 73 73 73 Second adhesive layer Thickness d[μm] 10 15 25 25 50 10 50 50 50 100 Storage elastic modulus [MPa] 0.1 0.1 0.1 0.1 0.1 0.02 0.02 0.15 0.02 0.1 Touch sensor panel Thickness e[μm] 7 7 7 7 7 7 7 7 13 7 Rigidity [MPa·mm] 31.6 31.6 31.6 31.6 31.6 31.6 31.6 31.6 58 31.6 t[μm]=(a+b+c+d+e) 157 142 197 192 197 157 197 197 178 227 {Ea×(a+b)}/t 2.10 1.90 4.11 2.03 2.79 2.10 2.79 2.79 2.39 1.19 b/(Ea×d) 1.67 1.11 0.50 0.67 0.20 1.67 0.20 0.20 0.10 0.03 Impact resistance test B B A B A B A A A B Flexibility (in) test A A A A B A C B B D Flexibility (out) test B B B B C A B C C D

10: Front panel 20: The first adhesive layer 30: Circularly polarized light plate 31: Linear polarizing plate 32: retardation layer 40: second adhesive layer 50: Touch sensor panel (TS panel) 60: Laminated layer 100: Flexible laminated body 200: Display layered body 300: Image display device

Fig. 1 is a schematic cross-sectional view schematically showing an example of the flexible laminate of the present invention. Fig. 2 is a schematic cross-sectional view schematically showing an example of the image display device of the present invention.

10: Front panel

20: The first adhesive layer

30: Circularly polarized light plate

31: Linear polarizing plate

32: retardation layer

40: second adhesive layer

50: Touch sensor panel (TS panel)

100: Flexible laminated body

Claims (9)

A flexible laminated body includes a front surface plate, a first adhesive layer, a circularly polarized light plate, a second adhesive layer and a touch sensor panel in sequence, The thickness of the front surface plate is set to a [μm], the thickness of the first adhesive layer is set to b [μm], the thickness of the circular polarizing plate is set to c [μm], and the The thickness of the second adhesive layer is set to d [μm], and the thickness of the touch sensor panel is set to e [μm], and the front surface plate is set at a temperature of 23° C. and a relative humidity of 55%. When the tensile modulus of elasticity is set to Ea[GPa], the relationship of the following formula (i) is satisfied: {Ea×(a+b)}/(a+b+c+d+e)≧1.5 (i). The flexible laminate according to claim 1, wherein the tensile elastic modulus Ea [GPa] of the front surface plate, the thickness b of the first adhesive layer, and the thickness of the second adhesive layer d satisfies the relationship of the following formula (ii): b/(Ea×d)≧0.3 (ii). The flexible laminate according to claim 1 or claim 2, wherein the front surface plate has a rigidity of 0.09 GPa·mm or more and 0.7 GPa·mm or less at a temperature of 23°C and a relative humidity of 55%, The rigidity of the circularly polarized light plate at a temperature of 23°C and a relative humidity of 55% is 40 MPa·mm or more and 400 MPa·mm or less, The rigidity of the touch sensor panel at a temperature of 23° C. and a relative humidity of 55% is 15 MPa·mm or more and 700 MPa·mm or less. The flexible laminate according to any one of claims 1 to 3, wherein: The storage elastic modulus of the first adhesive layer at a temperature of 25°C and a relative humidity of 50% is 0.01 MPa or more and 0.15 MPa or less, The storage elastic modulus of the second adhesive layer at a temperature of 25° C. and a relative humidity of 50% is 0.01 MPa or more and 0.15 MPa or less. The flexible laminate according to any one of claims 1 to 4, wherein the thickness a of the front surface plate and the thickness b of the first adhesive layer are represented by the following formula (iii) , When the total thickness t [μm] of the thickness c of the circularly polarizing plate, the thickness d of the second adhesive layer, and the thickness e of the touch sensor panel, t is 250 μm or less: t=a+b+c+d+e (iii). The flexible laminate according to any one of claims 1 to 5, wherein the front surface plate is a resin film or a hard coat resin film having a hard coat layer on at least one surface of the resin film . The flexible laminate according to any one of claims 1 to 6, wherein the limit bending number of the flexible laminate in a bending test performed on the inner side of the front surface plate is 50,000 times or more . The flexible laminate according to any one of claims 1 to 7, wherein the limit bending number of the flexible laminate in a bendability test in which the front surface plate side is the outer side is 50,000 times or more . An image display device including the flexible laminate according to any one of claim 1 to claim 8, and the front surface plate is arranged on the front surface.

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