KR20220044853A - Flexible image display device and optical laminate used therefor - Google Patents

Abstract

A flexible image display apparatus is equipped with a window member, a 1st member, a 1st laminated body, or a 1st touch sensor panel member, and the adhesive member of multiple layers. A 1st laminated body is a laminated body of a 2nd member and a 3rd A member (panel member is included). When providing a 1st laminated body, one of a 1st and 2nd member is an optical film, and the other is an optical film or a touch sensor. When provided with a 1st panel member with a touch sensor, a 1st member is an optical film. E0×T0≤0.32 (E0: modulus of elasticity (GPa) of the window member, T0: thickness (mm) of the window member), and the thickness of the first adhesive member disposed between the window member and the first member is 10 μm or less and the thickness of the adhesive member of at least one layer other than this is 18 micrometers or more.

Description

Flexible image display device and optical laminate used therefor

TECHNICAL FIELD The present invention relates to a flexible image display device and an optical laminate provided with a plurality of layers of adhesive members.

A flexible image display apparatus includes, for example, a panel member including a display panel, and an optical laminate disposed in front of the panel member. The optical laminate is provided with a window member and an optical film, for example, and may further be equipped with a touch sensor. An adhesive layer or an adhesion layer is arrange|positioned between each member contained in an optical laminated body, and between a panel member and an optical laminated body.

For example, in Patent Document 1, a display panel, a polarizing member provided on the display panel, a window provided on the polarizing member, a first adhesive member provided between the display panel and the polarizing member, and a first adhesive member provided between the polarizing member and the window A foldable display including two adhesive members has been proposed. Patent Document 1 describes that a foldable display device may include a touch sensing unit. In addition, Patent Document 1 describes a foldable display including a window WD, a touch sensing unit TSU, a polarizing member POL, and a display panel DP. A first adhesive member AD1 is disposed between the window WD and the touch sensing unit TSU, and a fourth adhesive member AD4 is disposed between the touch sensing unit TSU and the polarizing member POL. The second adhesive member AD2 is disposed between the polarizing member POL and the display panel DP.

Japanese Patent Application Laid-Open No. 2017-126061 (Claim 1, [0132], [0138] and FIG. 7B)

In a flexible image display apparatus, since the window member side becomes a surface (visible side), high pencil hardness is calculated|required by the surface by the window member side. However, even if it is a case where high pencil hardness is obtained only with a window member, in the state bonded together with another member by an adhesive member, pencil hardness may fall large. On the other hand, when pencil hardness is raised and a flexible image display apparatus is repeatedly bent in a high-temperature environment, peeling may arise between the bonded members, and high adhesiveness may not be ensured.

One aspect of the present invention, a window member,

a first member laminated on the window member;

a first laminate or a panel member with a first touch sensor laminated on the window member with the first member interposed therebetween;

A flexible image display device comprising a plurality of layers of adhesive members, comprising:

The first laminate is a laminate of a second member laminated on the window member with the first member interposed therebetween, and a 3A member laminated on the window member with the first member and the second member interposed therebetween;

When the flexible image display device includes the first laminate,

One of the first member and the second member is an optical film, and the other is an optical film or a touch sensor,

The 3A member includes at least a panel member,

The plurality of adhesive members are disposed at least between the window member and the first member, between the first member and the second member, and between the second member and the third member 3A. comprising a layer,

When the flexible image display device includes the first touch sensor-attached panel member,

The first member is an optical film,

The multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first touch sensor-attached panel member,

When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0≤0.32,

A thickness of the first adhesive member disposed between the window member and the first member satisfies the condition of 10 μm or less,

It is related with the flexible image display apparatus which satisfy|fills the condition of 18 micrometers or more in thickness of at least 1 layer other than the said 1st adhesive member among the said plurality of adhesive members.

Another aspect of the present invention is used in the above flexible image display device,

the absence of a window;

a first member laminated on the window member;

a second laminate or a first separator laminated on the window member with the first member interposed therebetween;

An optical laminate comprising a plurality of layers of adhesive members, comprising:

The second laminate is a laminate of a second member laminated on the window member with the first member interposed therebetween, and a 3B member laminated with the first member and the second member interposed therebetween,

When the optical laminate includes the second laminate,

One of the first member and the second member is an optical film, and the other is an optical film or a touch sensor,

The 3B member includes at least a second separator,

The plurality of adhesive members are disposed at least between the window member and the first member, between the first member and the second member, and between the second member and the third member 3B. comprising a layer,

When the optical laminate includes a first separator,

The first member is an optical film,

The multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first separator,

When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0≤0.32,

A thickness of the first adhesive member disposed between the window member and the first member satisfies a condition of 10 μm or less,

It is related with the optical laminated body with which the thickness of at least 1 layer other than the said 1st adhesive member satisfy|fills the conditions of 18 micrometers or more among the said multiple layer adhesive members.

High pencil hardness is securable in the surface of the window member side of a flexible image display apparatus and the optical laminated body used for this. In addition, when the flexible image display device is repeatedly bent in a high-temperature environment, high adhesiveness between the laminated members can be ensured.

1 is a schematic cross-sectional view of a flexible image display device according to a first embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a flexible image display device according to a second embodiment of the present invention.
3 is a schematic cross-sectional view of a flexible image display device according to a third embodiment of the present invention.

A flexible image display device according to the present invention includes a window member, a first member laminated on the window member, a first laminate or a panel member with a first touch sensor laminated on the window member with the first member interposed therebetween; A layered adhesive member is provided. A 1st laminated body is a laminated body of the 2nd member laminated|stacked on the window member via the 1st member, and 3A member laminated|stacked via the 1st member and the 2nd member.

When a flexible image display apparatus is equipped with a 1st laminated body, one of a 1st member and a 2nd member is an optical film, and the other is an optical film or a touch sensor. The 3rd A member contains a panel member at least. In this case, the multi-layered adhesive member includes at least three layers disposed between the window member and the first member, between the first member and the second member, and between the second member and the third member 3B. .

When a flexible image display apparatus is equipped with the panel member with a 1st touch sensor, a 1st member is an optical film. In this case, the multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first touch sensor-attached panel member.

Moreover, the optical laminated body used for said flexible image display apparatus is also contained in this invention. An optical laminated body is equipped with a window member, the 1st member laminated|stacked on the window member, the 2nd laminated body or 1st separator laminated|stacked on the window member via the 1st member, and the adhesive member of multiple layers. A 2nd laminated body is a laminated body of the 2nd member laminated|stacked on the window member via the 1st member, and the 3rd B member laminated|stacked via the 1st member and the 2nd member.

When an optical laminated body is equipped with a 2nd laminated body, one of a 1st member and a 2nd member is an optical film, and the other is an optical film or a touch sensor. The 3B member includes at least a second separator. The multi-layered adhesive member includes at least three layers disposed between the window member and the first member, between the first member and the second member, and between the second member and the third member 3B.

When an optical laminated body is equipped with a 1st separator, a 1st member is an optical film. In this case, the multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first separator.

An optical laminated body is used for the flexible image display apparatus in the state which peeled the separator (specifically, the 2nd separator contained in a 1st separator or 3rd B member). Said flexible image display apparatus will include the optical laminated body of the state which peeled the separator in the state arrange|positioned by the window member on the visual recognition side.

In the above flexible image display device and optical laminate, when the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0xT0≤0.32. The product of the elastic modulus and the thickness (=E0×T0) indicates the degree of rigidity (or hardness) of the window member. In addition, the unit of E0xT0 is kN/mm.

The flexible image display device is used in an exposed state with the surface of the window member on the viewing side. Therefore, high scratch resistance is requested|required of the surface on the side of a window member. The scratch resistance of the surface of the window member side can be evaluated by, for example, a pencil hardness test. However, even when high pencil hardness is obtained with only the window member, when a flexible image display device is obtained by laminating another member (eg, an optical film and a touch sensor) and an adhesive member through an adhesive member, the pencil hardness on the surface of the window member side is large. It became clear that it could be lowered. Unlike the adhesive member which adhere|attaches between each member by hardening, an adhesive member is equipped with high viscosity also in the state which bonded between each member together. Therefore, if the adhesive member is present in the flexible image display device, when the surface on the window member side is pressed, the stress is relieved by the adhesive member. It becomes difficult to go, and scratch resistance falls. When an optical laminated body is equipped with the adhesive member of multiple layers, such a fall of scratch resistance becomes more remarkable. On the other hand, in the case of the hardened adhesive member, the relaxation of the stress similar to the case of an adhesive member does not occur easily, and the fall of abrasion resistance is hardly seen. In a flexible image display apparatus, since high softness|flexibility is calculated|required by a structural member, it is thought that the influence on pencil hardness by a viscous adhesive member is easy to materialize.

In addition, the adhesive member is a hardened|cured adhesive agent, and does not have fluidity|liquidity. On the other hand, the adhesive member is a non-curable adhesive agent, and has fluidity|liquidity.

When the scratch resistance of the surface on the side of the window member is improved, the flexibility of the optical laminate or the flexible image display device tends to decrease. Even if the flexible image display apparatus with high scratch resistance of the surface on the side of a window member is repeatedly bent at room temperature (20 degreeC - 35 degreeC), peeling does not produce easily between the laminated|stacked members. However, it became clear that when the flexible image display device was repeatedly bent under a high-temperature environment (eg, 60° C.), peeling occurred between the laminated members and high adhesiveness could not be ensured in some cases.

In the flexible image display device and the optical laminate according to the present invention, when E0xT0≤0.32, the thickness of the adhesive member (hereinafter referred to as the first adhesive member) disposed between the window member and the first member is 10 ㎛ or less. Moreover, it is made to satisfy the condition of 18 micrometers or more in the thickness of at least 1 layer other than a 1st adhesive member among the multiple layer adhesive members contained in a flexible image display apparatus or an optical laminated body. By setting the thickness of the first adhesive member to 10 μm or less, the adhesive member when the surface of the window member is pressed despite the flexible image display device and the optical laminate having at least three layers or at least two layers of adhesive members deformation is reduced. As a result, high scratch resistance (more specifically, high pencil hardness) on the surface of the window member can be ensured. Moreover, the high flexibility of an optical laminated body can also be ensured by using the adhesive member of at least three layers or at least two layers. Moreover, by making the thickness of at least 1 layer of adhesive members other than a 1st adhesive member 18 micrometers or more, even if it bends repeatedly in a high-temperature environment, peeling between laminated|stacked members can be suppressed. That is, even under a high-temperature environment, high adhesiveness can be ensured.

In the flexible image display apparatus which concerns on this invention, the pencil hardness on the side of a window member is harder than F, and high pencil hardness can be ensured. Moreover, in the flexible image display apparatus which concerns on this invention, high pencil hardness of H or more can also be ensured from the window member side.

In addition, in this specification, pencil hardness means the scratch hardness (pencil method) prescribed|regulated to JISK5600-5-4:1999. Pencil hardness can be measured on condition of a load of 750g weight and 25 degreeC based on JISK5600-5-4:1999.

The hardness of each member in the flexible image display device or optical laminate including the window member can be adjusted, for example, by adjusting the material, layer configuration, and/or thickness of each member.

(no adhesive)

An optical laminate or a flexible image display device is provided with the adhesive member of multiple layers. More specifically, when the flexible image display device (or optical laminate) includes the first laminate (or the second laminate), the flexible image display device (or optical laminate) includes at least a window member and a first member A three-layer adhesive member disposed between the first member and the second member, and between the second member and the 3A member (or the 3B member) is provided. When the flexible image display device (or optical laminate) includes the first touch sensor-attached panel member (or the first separator), the plurality of layers of the adhesive member is at least between the window member and the first member, and the first member and the two-layer adhesive member arrange|positioned between the panel member with a 1st touch sensor (or 1st separator). The multiple-layered adhesive member may contain adhesive members other than the three-layer or two-layer adhesive member arrange|positioned between such adjacent members. Adhesive members other than the adhesive members of the three or two layers are in each member other than the window member (specifically, the first member, the second member, the 3A member (or the 3B member), and the first touch sensor in at least one member selected from the group consisting of an attachment panel member). Each adhesive member is usually layered. The number in particular of the adhesive member in each member is not restrict|limited, 0 layer may be sufficient, one layer may be sufficient, and two or more layers may be sufficient as it. In this way, the adhesive member (that is, a plurality of layers of adhesive member) included in the flexible image display device or the optical laminate includes both the adhesive member included between each adjacent member and the adhesive member included in each member. .

The number of adhesive members included in the flexible image display device or the optical laminate may be, for example, 8 or less, 7 or 6 or less, or 5 or 4 or less.

The thickness of the first adhesive member may be 10 µm or less, and may be 8 µm or less or 6 µm or less. In the present invention, when the product of the elastic modulus (E0 (GPa)) of the window member and the thickness (T0 (mm)) of the window member is E0 × T0 ≤ 0.32, by setting the thickness of the first adhesive member to such a range, High pencil hardness is securable from the window member side of a flexible image display apparatus regardless of the kind of material which comprises each adhesive member.

From the viewpoint of easily securing higher flexibility in the flexible image display device, the thickness of each layer of the adhesive member is preferably 3 µm or more, more preferably 5 µm or more, and 8 µm or more or 10 µm or more. It may be sufficient, and it is good also as 13 micrometers or more.

Among the plurality of adhesive members, the thickness of at least one adhesive member other than the first adhesive member may be 18 µm or more, or 20 µm or more. In the present invention, when the product of the elastic modulus (E0 (GPa)) of the window member and the thickness (T0 (mm)) of the window member is E0 × T0 ≤ 0.32, at least one adhesive member other than the first adhesive member By setting the thickness to such a range, even when the flexible image display device is repeatedly bent under a high-temperature environment, it is possible to ensure high adhesion between the laminated members. From the viewpoint of easily securing higher scratch resistance on the surface of the flexible image display device on the window member side, the thickness of at least one adhesive member other than the first adhesive member may be 50 μm or less, 40 μm or less, or 30 μm The following may be sufficient.

Among the adhesive members other than the first adhesive member, the thickness of at least one adhesive member may be 18 µm or more (or 20 µm or more). Among the adhesive members other than the first adhesive member, the thickness of at least two adhesive members may be 18 µm or more or 20 µm or more. The thickness of the pressure-sensitive adhesive member having such a thickness may be 50 µm or less, 40 µm or less, or 30 µm or less from the viewpoint of easily securing higher scratch resistance.

From the viewpoint of ensuring higher adhesiveness, it is advantageous to set the thickness of the adhesive member positioned outside the flexible image display device to 18 µm or more (or 20 µm or more) rather than the adhesive member positioned inside the flexible image display device in a bent state. .

Among the adhesive members other than the first adhesive member, the thickness of the remaining adhesive member is not particularly limited. As described above, from the viewpoint of flexibility, the thickness of the remaining adhesive member may be, for example, 3 µm or more, 5 µm or more, 8 µm or more, 10 µm or more, or 13 µm or more. The thickness of the remaining adhesive member may be 50 micrometers or less, 40 micrometers or less, or 30 micrometers or less may be sufficient as it.

Further, in the flexible image display device, between the surface of the window member on the first member side and the touch sensor or the panel member with a touch sensor (specifically, the panel member with the first or second touch sensor) of any one layer A decorating layer may be provided so that it may contact an adhesive member. When the thickness of the pressure-sensitive adhesive member at the portion where the decorative layer is provided is small, the level difference formed by the decorative layer is difficult to be absorbed by the pressure-sensitive adhesive member. Therefore, from the viewpoint of absorbing the level difference due to the decorative layer, the thickness of the pressure-sensitive adhesive member with which the decorative layer is in contact may be 10 µm or more. In the present invention, since the thickness of the first adhesive member is relatively small, from the viewpoint of absorbing the level difference due to the decorative layer, it is preferable to provide the decorative layer on the surface of the first member on the second member side or in the first member. It is advantageous.

From the viewpoint of absorbing the step difference due to the edible layer, the thickness of the adhesive member in contact with the edible layer may be 1.5 times or more, 2 times or more, 2.5 times or more, further 3 times or more, also be

The upper limit and the lower limit of the thickness of the layer of the pressure-sensitive adhesive member described above can be arbitrarily combined.

The thickness of an adhesion member cuts out the cross section of a flexible image display apparatus or an optical laminated body, and is measured based on the image by the scanning electron microscope (SEM) of the said cross section. The thickness of the pressure-sensitive adhesive member can be obtained by measuring and averaging the thickness at a plurality of arbitrary locations (eg, five locations) in the SEM image of the cross-section in the portion where the decorative layer is not formed.

The storage elastic modulus in 25 degreeC of each adhesive member may be 10 Mpa or less normally, 3 Mpa or less, or 2 Mpa or less may be sufficient, and 1.5 Mpa or less may be sufficient as it. The storage elastic modulus in 25 degreeC of each adhesive member becomes like this. Preferably it is 1 Mpa or less, 0.3 Mpa or less or 0.2 Mpa may be sufficient, and 0.15 Mpa or less or 0.1 Mpa or less may be sufficient as it. When the storage elastic modulus of an adhesive member is such a range, while being able to ensure high adhesiveness, unlike the case of the hardened|cured adhesive member, it is easy to relieve|moderate the stress by pressurization, and pencil hardness falls easily. ADVANTAGE OF THE INVENTION According to this invention, even when a flexible image display apparatus contains the adhesive member which is easy to relieve|moderate stress by pressure in this way in multiple layers, high pencil hardness can be ensured by controlling the thickness of a 1st adhesive member. 0.001 MPa or more may be sufficient as the storage elastic modulus in 25 degreeC of each adhesive member, and 0.005 MPa or more may be sufficient as it.

The upper limit and the lower limit of the storage elastic modulus of the adhesive member described above can be arbitrarily combined.

On the other hand, the storage elastic modulus in 25 degreeC of an adhesive member is larger than 10 Mpa, 100 Mpa or more may be sufficient, and it is about 1 GPa normally. In this specification, an adhesive member shall mean what has such a storage elastic modulus.

In this way, the adhesive member is distinguished from the adhesive member by the storage elastic modulus.

The storage elastic modulus of an adhesive member can be measured based on JISK7244-1:1998. Specifically, first, a molded article having a thickness of about 1.5 mm is produced using an adhesive member. This molded product was punched into a disk shape having a diameter of 7.9 mm to prepare a test piece. This test piece is inserted into a parallel plate, and the viscoelasticity is measured under the following conditions using a dynamic viscoelasticity measuring device (for example, 'Advanced Rheometric Expansion System (ARES)' manufactured by Rheometric Scientific), , to find the storage modulus at 25°C. Moreover, the storage elastic modulus of an adhesive member can also be calculated|required according to the case of an adhesive member.

(Measuring conditions)

Deformation mode: torsion

Measuring frequency: 1Hz

Measurement temperature: -40℃ to +150℃

Temperature rising temperature: 5°C/min

From a viewpoint of ensuring high visibility of a panel member, 85 % or more is preferable and, as for the total light transmittance of each adhesive member, 90 % or more is more preferable.

The total light transmittance of an adhesive member can be measured based on JISK7136K:2000. The test piece which arrange|positioned the adhesion member until it became a thickness of about 1.5 mm in alkali free glass (thickness 0.8-1.0 mm, total light transmittance 92%) is used for a measurement.

Each adhesive member is comprised by an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, and for example, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a vinyl alkyl ether-based pressure-sensitive adhesive, a polyvinylpyrrolidone-based pressure-sensitive adhesive, a polyacrylamide-based pressure-sensitive adhesive, and a cellulose pressure-sensitive adhesive. there is. The pressure-sensitive adhesive includes, for example, a base polymer, a crosslinking agent, an additive (such as a tackifier, a coupling agent, a polymerization inhibitor, a crosslinking retarder, a catalyst, a plasticizer, a softener, a filler, a colorant, a metal powder, an ultraviolet absorber, a light stabilizer, an antioxidant , degradation inhibitors, surfactants, antistatic agents, surface lubricants, leveling agents, corrosion inhibitors, particles of inorganic or organic materials (metal compound particles (metal oxide particles, etc.), resin particles, etc.), but are limited to these it is not

As an adhesive, when the adhesive from which the above storage elastic modulus is obtained is used, since the effect by controlling the thickness of an adhesive member becomes remarkable easily, it is advantageous. Among the plurality of layers of adhesive members, the adhesive constituting at least two layers of the adhesive member may be the same, or the adhesive constituting each adhesive member may be different.

The pressure-sensitive adhesive member can be formed, for example, by applying the pressure-sensitive adhesive constituting each pressure-sensitive adhesive member or transferring the pressure-sensitive adhesive molded into a sheet to one of the members holding the respective pressure-sensitive adhesive members. And each adhesive member is arrange|positioned between each member by laminating|stacking the other side of the member which clamps each adhesive member on an adhesive member. Even when the adhesive member is included in each member, the adhesive member is disposed in each member according to the case where it is disposed between the members. For example, the pressure-sensitive adhesive member is disposed on one side of the layer (or laminate) constituting each member and sandwiching the pressure-sensitive adhesive member by applying or transferring the pressure-sensitive adhesive as described above, and the other layer (or laminate) is formed. By affixing to an adhesive member, an adhesive member is arrange|positioned in each member.

(No window)

A window member is arrange|positioned at the outermost surface of the visual recognition side of a flexible image display apparatus or an optical laminated body for damage prevention of an optical film, a touch sensor, a panel member with a touch sensor, and a panel member.

When the product of the elastic modulus (E0) and the thickness (T0) of the window member is E0×T0≤0.32, the property of the adhesive member (particularly, the first adhesive member) included in the flexible image display device or the optical laminate is the window member Affects pencil hardness on the surface of the side. In addition, the thickness of at least one layer of the adhesive member other than the first adhesive member affects the adhesiveness between the laminated members (or between the layers constituting each member) when the flexible image display device is repeatedly bent under a high-temperature environment go crazy In the present invention, by controlling the thickness of the first adhesive member as described above, it is possible to ensure high pencil hardness on the surface of the window member. In addition, by controlling the thickness of at least one layer other than the first adhesive member as described above, high adhesiveness can be ensured even in a high-temperature environment.

A window member is equipped with the window film normally. High flexibility (high variability, etc.), high transparency (high total light transmittance, low haze, etc.), and high hardness are calculated|required of a flexible image display apparatus or the optical laminated body applied to it. The material of the window film is not particularly limited as long as it satisfies these physical properties.

As a window film, a transparent resin film is mentioned, for example. Examples of the resin constituting the transparent resin film include polyimide-based resins, polyamide-based resins, polyester-based resins, cellulose-based resins, acetate-based resins, styrene-based resins, sulfone-based resins, epoxy-based resins, polyolefin-based resins, and at least one selected from polyether ether ketone-based resins, sulfide-based resins, vinyl alcohol-based resins, urethane-based resins, acrylic resins, and polycarbonate-based resins. However, the resin constituting the transparent resin film is not limited thereto.

The thickness of the window film may be, for example, 20 µm or more and 500 µm or less, and may be 30 µm or more and 200 µm or less. When a window film is such thickness, it is easy to make high intensity|strength and high flexibility compatible.

In this specification, with respect to a material or member (molded object) other than an adhesive member or other than an adhesive, being transparent means that the total light transmittance of a test piece is 80 % or more. For the measurement of the total light transmittance, a test piece made of a transparent material or member and having a thickness of about 1.5 mm is used. A total light transmittance can be measured according to the case of an adhesive member.

The window member may be provided with a hard-coat layer. It is preferable that the hard-coat layer is provided at least on the side opposite to the 1st member side of a window member from a viewpoint that the high damage|damage prevention effect of a window film is easy to be acquired. More specifically, it is preferable that the hard-coat layer is provided in the surface of at least the 1st member side of a window film and the opposite side (that is, the visual recognition side of a window film).

The thickness of the hard coat layer may be, for example, 1 µm or more and 100 µm or less, and may be 1 µm or more and 50 µm or less. When a window member is provided with a some hard-coat layer, what is necessary is just to make the thickness of each hard-coat layer into such a range.

A hard-coat layer is formed by apply|coating a curable coating agent to the surface of the layer used as a base (for example, a window film), and hardening it.

As a coating agent, the thing of an optical film use can be used, for example. Examples of the coating agent include, but are not limited to, an acrylic coating agent, a melamine coating agent, a urethane coating agent, an epoxy coating agent, a silicone coating agent, and an inorganic coating agent.

The coating agent may contain an additive. Examples of additives include silane coupling agents, colorants, dyes, powders or particles (pigments, inorganic or organic fillers, particles of inorganic or organic materials, etc.), surfactants, plasticizers, antistatic agents, surface lubricants, leveling agents, antioxidants , a light stabilizer, an ultraviolet absorber, a polymerization inhibitor, an antifouling material, and the like, but is not limited thereto.

The window member may be provided with another layer (it is hereafter called the layer A) as needed. Examples of the layer A include an antireflection layer, an anti-glare layer, an antifouling layer, an anti-sticking layer, a color adjustment layer, an antistatic layer, an easily adhesive layer, a precipitation prevention layer such as ions or oligomers, an impact absorbing layer, and an anti-scattering layer. The window member may include one layer of the layer A, and may include it in multiple layers. The layer A is provided, for example, on the surface side or the first member side of another layer or laminate (eg, window film) constituting the window member. The layer A may be directly formed by coating etc. on the other layer or laminated body which comprises a window film, and may be laminated|stacked through an adhesive member. In addition, the window member does not contain an adhesive member. An adhesive member shall mean the adhesive member provided with the storage elastic modulus in 25 degreeC as mentioned above here.

The thickness T0 of the window member may be, for example, 0.02 mm or more and 0.6 mm or less, and may be 0.03 mm or more and 0.3 mm or less.

The thickness T0 of the window member cuts out a cross section of the flexible image display device or the optical laminate, and is measured based on an SEM image of the cross section. The thickness T0 can be calculated|required by measuring and averaging the thickness at arbitrary multiple places (for example, five places) in the SEM image of the said cross section.

In addition, in this specification, the thickness of the member which comprises an optical laminated body or a flexible image display apparatus can be calculated|required according to the case of thickness T0 of a window member.

The elastic modulus E0 of the window member may be, for example, 0.53 GPa or less and 16 GPa or less, 1 GPa or more and 15 GPa or less, 1 GPa or more 10 GPa or less, or 3 GPa or more and 8 GPa or less.

The elastic modulus (E0) (GPa) of the window member is an average value (arithmetic mean value) obtained by preparing three measurement samples of the window member, measuring the elastic modulus of each sample by a tensile test, and averaging. The tensile test can be performed under the following conditions using the following apparatus.

Tensile tester: Autograph AG-1S, manufactured by Shimatsu Co., Ltd.

Control: Stroke

Gauge distance: 100mm

Tensile speed: 50mm/min

Elastic modulus calculation range: 10N/㎟ to 20N/㎟

In addition, the sample for elastic modulus measurement is produced as follows. First, the longitudinal and lateral elastic modulus of the window member are measured. Next, a sample is produced by cutting a window member into strip shape, making the length in the direction with a high elastic modulus 150 mm, and making the length in the direction with a low elastic modulus 10 mm. For cutting the window member, for example, a multi-purpose specimen cutting machine manufactured by Dumbbell Corporation is used.

E0xT0 (kN/mm) may be 0.32 or less, and 0.3 or less may be sufficient as it. In addition, E0xT0 may be 0.01 or more, for example, 0.02 or more, 0.05 or more, 0.1 or more, or 0.2 or more may be sufficient. These upper limits and lower limits can be combined arbitrarily.

(first member and second member)

In the flexible image display apparatus and the optical laminate, the first member is laminated on the window member. When a flexible image display apparatus (or optical laminated body) is equipped with a 1st laminated body (or 2nd laminated body), the 2nd member is laminated|stacked on the window member via the 1st member. An adhesive member is interposed between the window member and the first member and between the first member and the second member, respectively. When a flexible image display apparatus (or optical laminated body) is provided with a 1st laminated body (or 2nd laminated body), one of a 1st member and a 2nd member is an optical film, and the other is an optical film or a touch sensor. . A flexible image display apparatus (or optical laminated body) is equipped with a 3rd A member (or 3rd B member), One of a 1st member and a 2nd member is an optical film, The other may be a touch sensor. An optical film may be sufficient as a 1st member when a flexible image display apparatus is equipped with a 1st panel member with a touch sensor, and when an optical laminated body is equipped with a 1st separator. In addition, when a 3rd A member contains a panel member with a 2nd touch sensor, an optical film may be sufficient as each of a 1st member and a 2nd member.

Since the first member and the second member are members included in the flexible image display device, they have moderate strength and flexibility. Let the elastic modulus GPa of a 1st member and a 2nd member be E1 and E2, respectively, Let thickness (mm) of a 1st member and a 2nd member be T1 and T2, respectively. At this time, it is preferable that a 1st member and a 2nd member satisfy|fill the following, respectively. In each member, when the product of the elastic modulus and the thickness is within such a range, the effect of controlling the thickness of each layer of the pressure-sensitive adhesive member as described above is further easily obtained.

0.01≦E1×T1≦0.35 (first member)

0.01≤E2xT2≤0.35 (second member)

In addition, each unit of E1xT1 and E2xT2 is kN/mm.

(optical film)

An optical film is a film which provides an optical function. Optical films are typically laminates comprising at least one layer having an optical function. As an optical film, what is used in the field|area of an image display apparatus etc. is mentioned. An optical film may be sufficient as each of a 1st member and a 2nd member, or the one layer which comprises an optical film, or the laminated body of two or more layers may be sufficient as it.

Examples of the layer having an optical function include a layer having optical anisotropy (eg, an optically anisotropic film). Examples of the layer having optical anisotropy include, but are not limited to, a polarizer, a retardation layer, a viewing angle magnifying film, a viewing angle limiting (peep-preventing) film, a brightness enhancing film, and an optical compensation film. The laminate of two or more layers may contain two or more chosen from the layer which has these optical anisotropy. In the laminate of two or more layers, all of the layers having optical anisotropy may have different functions, or at least two layers may have the same function. For example, the laminate may contain a polarizer and a retardation layer, and may contain two retardation layers from which a composition differs.

The optical film may contain the layer which has an at least 1 optical function, and the base material layer (or protective layer to protect) which hold|maintains this layer. For example, a polarizing plate is provided with a film-form polarizer at least, and may be comprised from the protective film which protects a polarizer and a polarizer.

It does not restrict|limit especially as a polarizer, What is used for the field|area of an image display apparatus etc. can be used. Examples of the polarizer include a film obtained by adsorbing a dichroic substance to a hydrophilic polymer film and uniaxially stretching, and a polyene-based oriented film. Examples of the hydrophilic polymer constituting the hydrophilic polymer film include polyvinyl alcohol-based resins (including partially formalized polyvinyl alcohol-based resins) and partially saponified products of ethylene-vinyl acetate copolymer. Examples of the dichroic substance include iodine and dichroic dye. As a material which comprises a polyene-type oriented film, the dehydration-processed material of polyvinyl alcohol-type resin, and the dehydrochloric acid-treated material of polyvinyl chloride-type resin are mentioned, for example.

As the polarizer, a thin polarizer having a thickness of 10 µm or less may be used. As a thin polarizer, it describes in, for example, Japanese Unexamined-Japanese-Patent No. 51-069644, Unexamined-Japanese-Patent No. 2000-338329, International Publication No. 2010/100917 pamphlet, Japanese Patent Publication No. 4691205, Japanese Patent Publication No. 4751481, for example. The polarizer which has become is mentioned. A thin polarizer can be obtained by the manufacturing method containing the process of extending|stretching in the state which laminated|stacked the polyvinyl alcohol-type resin layer and the resin base layer, for example, and the process of dyeing with a dichroic material.

As the protective film, for example, a polymer film excellent in transparency, mechanical strength, thermal stability, moisture barrier property, and optical isotropy is used. As a polymer material having such properties, the protective film is, for example, a cellulose-based resin, a polyolefin-based resin (including a cyclic polyolefin-based resin), an acrylic resin, an imide-based resin (including a phenylmaleimide-based resin), and a polyamide-based resin. Resin, polycarbonate-based resin, polyester-based resin (including polyarylate-based resin), acetate-based resin, polyethersulfone-based resin, polyvinyl chloride-based resin, polyvinylidene chloride-based resin, polystyrene-based resin, polyvinyl alcohol At least one selected from the group consisting of a resin-based resin, a sulfide-based resin (eg, polyphenylene sulfide-based resin), a polyether ether ketone-based resin, an epoxy-based resin, and a urethane-based resin is included. However, the resin constituting the protective film is not limited to these polymer materials.

An optical film may contain the protective film of one layer, and may also contain the protective film of two or more layers. A protective film may be arrange|positioned on one surface of the layer (for example, polarizer) which has an optical function, and may be arrange|positioned on both surfaces. Moreover, the optical film may contain two or more layers of the layer which has the optical function by which the protective film was arrange|positioned on one surface. When the optical film contains two or more protective films (for example, when protective films are disposed on both surfaces of the polarizer), the composition of all protective films may be different, and the composition is the same in at least two protective films You can do it.

In addition to a polarizer or a polarizing plate, an optical film may be equipped with the other film (henceforth a layer B) which provides optical functions other than a polarizer or a polarizing plate. Examples of the layer B include those used in the field of image display devices. Layer B may be, for example, an optically anisotropic film. As layer B, things other than a polarizer or a polarizing plate are mentioned among the layers which have said optical anisotropy. Specifically, as the layer B, for example, a retardation layer, a viewing angle magnifying film, a viewing angle limiting (peep prevention) film, a luminance enhancing film, and an optical compensation film are exemplified. The optical film may include one such layer B, and may include two or more. However, the layer B is not limited to these.

The thickness of the optical film may be, for example, 5 µm or more and 500 µm or less, and may be 10 µm or more and 100 µm or less.

The thickness of a polarizing plate is 200 micrometers or less, for example. From a viewpoint of being easy to ensure high flexibility, 100 micrometers or less are preferable and, as for the thickness of a polarizing plate, 80 micrometers or less or 70 micrometers or less are more preferable. The thickness of a polarizing plate is 10 micrometers or more, for example.

The thickness of the layer B is, for example, 0.1 µm or more and 100 µm or less. When the polarizing plate does not contain a protective film (that is, when the layer B has both a function as a protective film), the layer B so that the thickness of the laminate of the layer B and the polarizing plate is within the range described with respect to the thickness of the polarizing plate It is desirable to adjust the thickness of

In addition, the layer which comprises an optical film may be laminated|stacked directly on the adjacent layer using coating etc. In addition, the layer which comprises an optical film may be laminated|stacked on the layer adjacent to it via an adhesive member or an adhesion member. For example, the layer B may be laminated|stacked on a polarizing plate via an adhesive member, and may be laminated|stacked via an adhesive member. In addition, when two or more adjacent layers B are provided, between adjacent layers B may be laminated|stacked via either an adhesive member or an adhesive member.

(touch sensor)

As a touch sensor, what is used in the field|area of an image display apparatus etc. is used, for example. Examples of the touch sensor include, but are not limited to, those of a resistive film type, a capacitive type, an optical type, or an ultrasonic type. In a flexible image display device and an optical laminate, when an optical film exists between a touch sensor and a window member, if a capacitive touch sensor is used, high sensitivity is easy to be acquired.

A capacitive touch sensor is provided with a transparent conductive layer normally. As such a touch sensor, the laminated body of a transparent conductive layer and a transparent base material is mentioned, for example. As a transparent base material, a transparent film is mentioned, for example.

Although it does not restrict|limit especially for a transparent conductive layer, A conductive metal oxide, a metal nanowire, etc. are used. Examples of the metal oxide include indium oxide (ITO: Indium Tin Oxide) containing tin oxide and tin oxide containing antimony. The transparent conductive layer may be a conductive pattern made of a metal oxide or a metal. Examples of the shape of the conductive pattern include, but are not limited to, stripe shape, square shape, lattice shape, and the like.

The surface resistance value of the transparent conductive layer may be, for example, 0.1 Ω/square or more and 1000 Ω/square or less, and may be 0.5 Ω/square or more and 500 Ω/square or less.

The thickness of the transparent conductive layer may be, for example, 0.005 µm or more and 10 µm or less, and may be 0.01 µm or more and 3 µm or less.

As the transparent film, for example, a transparent resin film is used. Examples of the resin constituting the transparent resin film include polyester-based resins (including polyarylate-based resins), acetate-based resins, polyethersulfone-based resins, polycarbonate-based resins, polyamide-based resins, polyimide-based resins, and polyolefin-based resins. , acrylic resin, polyvinyl chloride-based resin, polyvinylidene chloride-based resin, polystyrene-based resin, polyvinyl alcohol-based resin, sulfide-based resin (eg, polyphenylene sulfide-based resin), polyether ether ketone-based resin, cellulose-based resin Resin, epoxy resin, urethane resin, etc. are mentioned. A transparent resin film may contain these resin 1 type, and may contain 2 or more types. Among these resins, polyester-based resins, polyimide-based resins and polyethersulfone-based resins are preferable. However, the resin constituting the transparent resin film is not limited to these resins.

From a viewpoint of improving the adhesiveness of a transparent conductive layer and a transparent base material, you may use what was surface-treated as a transparent base material. A well-known thing can be employ|adopted as surface treatment. If necessary, prior to lamination of the transparent conductive layer, the transparent substrate may be subjected to, for example, vibration damping or cleaning treatment (such as cleaning treatment using a solvent or ultrasonic wave).

You may provide other layers (henceforth a layer C) other than a transparent conductive layer and a transparent base material in a touch sensor as needed. For example, you may provide an undercoat layer or an oligomer precipitation prevention layer as layer C between a transparent conductive layer and a transparent base material. Moreover, you may laminate|stack the layer C on at least one surface of a transparent conductive layer and a transparent base material. Examples of the layer C include a functional layer having a desired function (eg, a film imparting the above optical function (such as an optically anisotropic film), a layer having the above optical function), a decorative base film, and the like. A decorative base film is laminated|stacked on the surface of a transparent conductive layer, for example. However, the layer C is not limited to these layers. If necessary, the layer C may be laminated on the transparent conductive layer or the transparent substrate via an adhesive member or an adhesive member.

The thickness of the whole touch sensor may be 5 micrometers or more and 250 micrometers or less, and 10 micrometers or more and 200 micrometers or less may be sufficient, for example.

(third member)

In the flexible image display apparatus and the optical laminate, the third member is laminated on the window member with the first member and the second member interposed therebetween. And it is a state in which the adhesive member interposed between the 2nd member and the 3rd member. The third member of the flexible image display device is referred to as a 3A member. The 3A member includes at least a panel member. The 3rd member of an optical laminated body is called a 3rd B member. The 3B member includes at least a separator (second separator). An optical laminated body is contained in the flexible image display apparatus in the state which peeled the separator. The 3B member does not contain any of a panel member and a panel member with a touch sensor. Each of the 3rd A member and the 3rd B member may be a laminate. An adhesive member or an adhesive member may be contained in each of 3rd A member and 3B member.

The 3rd A member should just contain the panel member at least. The 3A member may be, for example, a laminate of a panel member and a protective member that protects the panel member. When the 3A member includes the protective member, the protective member is usually laminated on the side opposite to the second member side of the panel member. That is, the protection member is provided in the side opposite to the visual recognition side of a panel member. However, these are merely examples, and the 3A member is not limited thereto. When the 3A member is a laminate, the adjacent layers (or members, for example, a panel member and a protection member) constituting the laminate may be laminated via an adhesive member or an adhesive member.

Let the elastic modulus (GPa) of 3rd A member be E3, and let thickness (mm) of 3rd A member be T3. The 3A member preferably satisfies the following formula.

0.01≤E3×T3≤0.35

3A member WHEREIN: When the product of an elastic modulus and thickness is such a range, it becomes easy to acquire the effect by controlling the thickness of an adhesive member as mentioned above. In addition, the unit of E3xT3 is kN/mm.

The 3rd B member in an optical laminated body should just contain the separator at least. The 3B member may be constituted only by a separator. The 3B member is laminated with the second member so that the separator is in contact with the pressure-sensitive adhesive member disposed on the side opposite to the first member side of the second member. And a flexible image display apparatus is formed by peeling a separator from an optical laminated body, and affixing the exposed adhesive member to the 3rd A member (specifically, a panel member or the laminated body containing a panel member).

(Panel member)

The panel member includes, for example, at least an image display panel. A sealing member (thin film sealing layer, etc.) may be arrange|positioned on the visual recognition side of an image display panel. The sealing member is normally arrange|positioned directly on the surface of the visual recognition side of an image display panel.

As an image display panel, a well-known thing is used. As an image display panel, an organic electroluminescence (EL:Electro Luminescence) panel is mentioned, for example.

(no protection)

As a protective member, the sheet|seat or film (or board|substrate) which hold|maintains or protects a panel member is mentioned, for example. The protection member should just have moderate flexibility which does not impair the moderate intensity|strength for protecting a panel member, and the flexibility of a flexible image display apparatus while hold|maintaining a panel member. As the protective member, a resin sheet or the like is used. The material in particular of the resin sheet is not restrict|limited, For example, it can select suitably according to the kind of image display panel.

(Panel member with touch sensor)

The panel member with a touch sensor (specifically, each of the panel member with a 1st touch sensor and the panel member with a 2nd touch sensor contained in the 3rd A member) integrates a touch sensor and a panel member. Such a panel member with a touch sensor includes, for example, a structure in which a metal mesh electrode antistatic capacitive touch sensor is formed on a thin film encapsulation layer of an organic light emitting diode (OLED). As a touch sensor, you may refer to the description above.

The panel member includes, for example, at least an image display panel. A sealing member (thin film sealing layer, etc.) may be arrange|positioned on the visual recognition side of an image display panel. The sealing member is normally arrange|positioned directly on the surface of the visual recognition side of an image display panel.

A well-known thing is used as an image display panel. As an image display panel, an organic electroluminescence (EL:Electro Luminescence) panel is mentioned, for example.

The panel member with a touch sensor may be equipped with the protection member. As a protective member, the sheet|seat or film (or board|substrate) which hold|maintains or protects a panel member is mentioned, for example. What is necessary is just to have the moderate softness|flexibility which does not impair the moderate intensity|strength for protecting a panel member, and the flexibility of a flexible image display apparatus while holding a panel member. As the protective member, a resin sheet or the like is used. The material in particular of a resin sheet is not restrict|limited, For example, it can select suitably according to the kind of image display panel.

Let the elastic modulus (GPa) of a panel member with a touch sensor be Ep, let thickness (mm) of a panel member with a touch sensor be Tp. At this time, it is preferable that the panel member with a touch sensor satisfy|fills the following formula.

0.01≤Ep×Tp≤0.35

A panel member with a touch sensor WHEREIN: When the product of an elastic modulus and thickness is such a range, the effect by controlling the thickness of each adhesive member as mentioned above becomes more easy to be acquired. In addition, the unit of Ep x Tp is kN/mm.

(separator)

As the separator (specifically, each of the first separator and the second separator included in the 3B member), for example, a release sheet including a base sheet and a release agent disposed on at least one surface of the base sheet is used. The separator is disposed with the release agent in contact with the pressure-sensitive adhesive member. More specifically, the first separator is disposed in contact with the adhesive member disposed on the side opposite to the window member of the first member. The second separator is disposed in a state in contact with the pressure-sensitive adhesive member disposed on the side opposite to the first member side of the second member.

As a base material sheet, while maintaining the structure except for the 1st separator or 3rd B member of an optical laminated body, it has moderate intensity|strength and softness|flexibility, and what is necessary is just to be able to form the layer of a release agent easily. As the base sheet, a resin film, paper, or a laminate of these materials is used. The material of the base sheet is determined depending on the type of release agent, the configuration of the optical laminate, and the like. As the resin film, for example, a polyester film (such as a polyethylene terephthalate film) or a polyolefin film (such as a polypropylene film) may be used. The thickness in particular of a base material sheet is not restrict|limited, either, It can select in consideration of desired peelability. As a release agent, a well-known thing can be used and it is preferable to select the thing with little residual amount to the separator of an adhesion member. For example, a silicone-based release agent and a fluorine-based release agent may be used.

(edible layer)

The decorative layer is, for example, between a window member and a touch sensor or a panel member with a touch sensor (more specifically, a panel member with a first touch sensor or a panel member with a second touch sensor), any one layer of the adhesive member and placed in contact. For example, when the surface of the window member on the first member side, the first laminate side of the first member or the surface of the panel member side with a first touch sensor (or the first separator side), and the second member are an optical film, the second member is an optical film. The decoration layer may be provided in any one of the surfaces of the 3A member side (or 3B member side) of 2 members. Moreover, when an adhesive member is contained in at least one in the 1st member and in the 2nd member, the decorating layer may be arrange|positioned so that it may contact this adhesive member. The decorative layer is usually provided in a frame-like pattern so that the lead-out wiring of the driving element or the touch sensor is not visually recognized from the outside on the outer periphery of the display unit where the image is displayed. However, the shape of the decorative layer is not limited to a frame shape, and any shape capable of concealing lead wiring or the like may be sufficient.

In addition to not reflecting the light from the viewing side, the decorative layer is required to shield the light from the side opposite to the viewing side. Such a decorative layer is composed of, for example, an ink layer, a metal thin film, and a thin film containing fine metal particles. The thin film containing fine metal particles includes, for example, fine metal particles and a binder resin. A single layer structure may be sufficient as a decoration layer, and a laminated structure may be sufficient as it. The decorative layer of the laminated structure may be, for example, at least two laminates selected from the group consisting of an ink layer, a thin metal film, and a thin film containing fine metal particles. The laminate also includes a laminate of thin films comprising two or more ink layers having different compositions, two or more metal thin films having different compositions, or two or more metal fine particles having different compositions.

The thickness of the decorative layer may be, for example, 20 µm or less, or 15 µm or less. From the viewpoint of easily eliminating the level difference due to the decorative layer by the adhesive member, the thickness of the decorative layer is preferably 10 µm or less, and may be 8 µm or less or 5 µm or less. Moreover, when the thickness of a decorating layer is such a range, it is easy to ensure the high bending resistance of a flexible image display apparatus and an optical laminated body. From the viewpoint of securing a higher hiding effect of the lead wiring, the thickness of the decorative layer is preferably 10 nm or more, more preferably 30 nm or more or 50 nm or more. These upper limits and lower limits can be combined arbitrarily.

The decorative layer may be formed, for example, by applying a coating agent containing a component of the decorative layer to the surface of the member or layer (excluding the adhesive member) in contact with the decorative layer. For example, when the surface of the window member on the first member side, the first laminate side of the first member or the surface of the panel member side with a first touch sensor (or the first separator side), and the second member are an optical film, the second member is an optical film. You may form a decoration layer by apply|coating the coating agent containing the component of a decoration layer to any one of the surfaces of the 3A member side (or 3B member side) of 2 members. Further, the decorative layer may be formed by depositing the constituent components on the surface of the member or layer (excluding the adhesive member) in contact with the decorative layer by vapor deposition. For example, when the surface of the window member on the first member side, the first laminate side of the first member or the surface of the panel member side with a first touch sensor (or the first separator side), and the second member are an optical film, the second member is an optical film. You may form a decorative layer by depositing a structural component on either of the surfaces of the 3A member side (or 3B member side) of 2 members by a vapor phase method. In the case of a metal thin film, a decorative layer with a small thickness can be easily formed, particularly by using a vapor phase method. Examples of the vapor phase method include a sputtering method, a vacuum vapor deposition method, a chemical vapor deposition (CVD: Chemical Vapor Deposition) method, an electron beam vapor deposition method, and the like. According to these cases, if the decorative layer is formed on the surface of the layer or laminate constituting the first member or the second member, the decorative layer can be formed in each member.

Prior to application, a primer layer may be disposed on the surface of the member or layer (excluding the adhesive member) to which the coating agent is applied. For example, when the decorative layer is provided on the first member side surface of the window member, a primer layer may be disposed between the decorative layer and the first member side surface of the window member. When the decorative layer is provided on the surface of the first laminate side of the first member or the panel member side with a first touch sensor (or the first separator side), the decorative layer and the first laminate side or the first A primer layer may be arrange|positioned between the surface of the panel member side with a touch sensor (or the 1st separator side). The primer layer contains, for example, at least one selected from the group consisting of a metal compound (a metal oxide, a metal nitride, a metal carbide, a metal sulfide, etc.) and a resin material. The primer layer is preferably transparent.

In addition to being easy to absorb the level|step difference of a decorative layer by an adhesive member, from a viewpoint of being easy to suppress the optical influence by a primer layer, the one with a smaller thickness of a primer layer is preferable. The thickness of the primer layer is, for example, 500 nm or less, preferably 100 nm or less or 30 nm or less.

A flexible image display apparatus and an optical laminated body are produced, for example by laminating|stacking a structural member, arrange|positioning an adhesive member between each member (and between the layers which comprise each member as needed). The order of lamination is not particularly limited.

For example, the window member and the first member may be laminated with the first adhesive member interposed therebetween, and then the first member and the second member may be laminated with the adhesive member interposed between these members. . Further, after laminating the first member and the second member with the adhesive member interposed between these members, the first member and the window member may be laminated with the first adhesive member interposed between these members. It is preferable that each adhesive member is previously affixed on one side of the member which clamps each adhesive member.

In an optical laminated body, before laminating|stacking a 2nd member with a 1st member, you may arrange|position an adhesion member on the surface on the opposite side to the 1st member side of a 2nd member. In addition, you may arrange|position an adhesive member on the surface opposite to the 1st member side of a 2nd member at an appropriate step after laminating|stacking a 2nd member with a 1st member. In an optical laminate, a separator is laminated|stacked on the adhesive member arrange|positioned on the surface on the opposite side to the 1st member side of a 2nd member before or after arrange|positioning an adhesive member on the surface of a 2nd member.

A flexible image display apparatus may be produced by producing an optical laminated body in advance, peeling 3B member (more specifically, a separator) from an optical laminated body, and affixing the exposed adhesive member to a 3rd A member. Further, after laminating the 3A member and the second member so that the adhesive member is interposed therebetween, the first member is laminated to the second member so that the adhesive member is interposed therebetween, and then the window member is provided to the first member You may produce an image display apparatus by laminating|stacking so that an adhesive member may interpose between them. Further, a laminate of the 3A member and the second member and a laminate of the window member and the first member are prepared in advance, and these laminates are interposed between the first member and the second member with an adhesive member You may laminate|stack it in the made state.

These manufacturing methods are just an illustration, and are not limited to these. Even when a flexible image display apparatus or an optical laminated body is equipped with the panel member with a touch sensor, according to these manufacturing methods, it can produce by laminating|stacking each member.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the flexible image display apparatus of 1st Embodiment which concerns on the said aspect of this invention. The flexible image display device 1 is a laminate of a window member 11 , an optical film 12 as a first member, a touch sensor 13 as a second member, and a panel member 14 as a 3A member. to provide The laminated body of the touch sensor 13 which is a 2nd member, and the panel member 14 which is a 3rd A member corresponds to the 1st laminated body L. The optical film 12 and the window member 11 are laminated|stacked with the adhesive member (1st adhesive member) 21 interposed between the optical film 12 and the window member 11 . The touch sensor 13 is laminated on the window member 11 via the optical film 12 . An adhesive member 22 is interposed between the optical film 12 and the touch sensor 13 . The panel member 14 is laminated on the window member 11 via the optical film 12 and the touch sensor 13 . An adhesive member 23 is interposed between the touch sensor 13 and the panel member 14 . The laminated body of the structure except the panel member 14 in FIG. 1, and a separator (not shown) corresponds to an optical laminated body.

The window member 11 includes, for example, a window film 111 and a hard coat layer 112 laminated on the window film 111 . The hard coat layer 112 is formed on the side opposite to the first member (optical film 12) side of the window member 11 (more specifically, on the side opposite to the first member side of the window film 111 ). surface) is provided. The product of the elastic modulus E0 of the window member 11 and the thickness T0 satisfies E0×T0≤0.32.

The optical film 12 includes a polarizing plate composed of a polarizer 121 and a protective film 122 , and a retardation layer 123 . The retardation layer 123 is arrange|positioned at the touch sensor 13 side which is a 2nd member, and is laminated|stacked on the polarizer 121 side of a polarizing plate.

The touch sensor 13 includes a transparent conductive layer 131 and a transparent film (touch sensor film) 132 as a transparent substrate. The touch sensor 13 is disposed so that the transparent conductive layer 131 is in contact with the adhesive member 22 disposed between the optical film 12 and the touch sensor 13 .

The panel member 14 includes an organic EL panel (organic EL display) 141 and a thin film encapsulation layer 142 . The panel member 14 is disposed such that the thin film encapsulation layer 142 is in contact with the adhesive member 23 disposed between the touch sensor 13 and the panel member 14 .

In the flexible image display apparatus 1 and the optical laminated body, it is E0xT0<=0.32, and it is controlled so that the thickness of the 1st adhesive member 21 may become the above-mentioned range. Moreover, it is controlled so that the thickness of at least 1 layer of adhesive members other than the 1st adhesive member 21 may become the above-mentioned range. Thereby, high pencil hardness is ensured on the surface of the window member 11 side of the flexible image display device 1 and the optical laminate, and even when the flexible image display device is repeatedly bent under a high-temperature environment, between the laminated members high adhesion can be ensured.

In FIG. 1, the frame-shaped decorating layer 30 is provided in the surface by the 2nd member (touch sensor 13) side of a 1st member (optical film 12). In this case, by setting the thickness of the adhesive member (specifically, the adhesive member 22 ) with which the decorative layer 30 comes into contact with 10 µm or more, the level difference due to the decorative layer 30 can be effectively absorbed.

In addition, in FIG. 1, although the case where the decoration layer 30 was formed in the surface by the side of the touch sensor 13 of the optical film 12 was shown, it is not limited to this case. The decorating layer 30 may be provided on the surface of the window member 11 by the 1st member (optical film 12) side.

In FIG. 1, the case where a 1st member is the optical film 12, a 2nd member is the touch sensor 13, and 3A member is a panel member was shown. However, it is not limited to this case, A touch sensor may be laminated|stacked on the window member 11 as a 1st member, and an optical film may be laminated|stacked on the window member 11 via a touch sensor as a 2nd member. Moreover, as 3rd A member, you may use the laminated body containing the above panel members.

Fig. 2 is a schematic cross-sectional view of the flexible image display device of the second embodiment. The flexible image display apparatus 101 is equipped with the laminated body of the window member 11, 12 A of optical films as a 1st member, and the 1st laminated body L. The 1st laminated body L has the structure in which the optical film 12B which is a 2nd member, and the 2nd panel member 15B with a touch sensor which is a 3rd A member were laminated|stacked. An adhesive member 21 is interposed between the window member 11 and the optical film 12A. The adhesive member 22 is interposed between the optical film 12A and the 1st laminated body L, and the adhesive member 23 is interposed between the optical film 12B and the 2nd touch sensor panel member 15B. is intervening Except for the structure of the optical film 12A which is a 1st member, and the 1st laminated body L, it is the same as that of 1st Embodiment, and description of 1st Embodiment can be referred.

The optical film 12A is a polarizing plate comprised from the polarizer 121 and the protective film 122. As shown in FIG. In the optical film 12A, the polarizer 121 is disposed on the adhesive member 22 side (in other words, on the side opposite to the window member 11 ). The optical film 12B is a laminate of two retardation layers 123 and 124 .

About 2nd Embodiment, for example, the laminated body of the structure except the 2nd panel member 15B with a touch sensor, and the separator (2nd separator) not shown corresponds to an optical laminated body.

3 is a schematic cross-sectional view of a flexible image display device according to a third embodiment. The flexible image display apparatus 201 is equipped with the laminated body of the window member 11, the optical film 12 as a 1st member, and 15 A of 1st panel members with a touch sensor. An adhesive member 21 is interposed between the window member 11 and the optical film 12 . An adhesive member 22 is interposed between the optical film 12 and the first panel member with a touch sensor 15A. It is the same as that of 1st Embodiment except that 15 A of 1st panel members with a touch sensor are arrange|positioned instead of the 1st laminated body L. Description of 1st Embodiment can be referred for structures other than 15 A of 1st panel members with a touch sensor.

About 3rd Embodiment, the laminated body of the structure except 15 A of 1st panel members with a touch sensor, and the separator (1st separator) not shown corresponds to an optical laminated body.

Also in each of 2nd Embodiment and 3rd Embodiment, it is E0xT0≤0.32, and it is controlled so that the thickness of the 1st adhesive member 21 may become the above-mentioned range. Moreover, it is controlled so that the thickness of at least 1 layer of adhesive members other than the 1st adhesive member 21 may become the above-mentioned range. As a result, high pencil hardness is ensured on the surface of the flexible image display apparatuses 101 and 201 and the window member 11 side of the optical laminate, and even when the flexible image display apparatus is repeatedly bent under a high-temperature environment, the laminated member High adhesion between them can be ensured.

[Example]

Hereinafter, although this invention is demonstrated concretely based on an Example and a comparative example, this invention is not limited to the following example.

<<Examples 1 to 4 and Comparative Examples 1 to 6>>

(1) Preparation of samples for evaluation

The sample for evaluation of the flexible image display apparatus 1 as shown in FIG. 1 was produced in the following procedure.

(a) Manufacture of the window member 11

As the window member 11, an acrylic hard coat layer 112 (thickness 10 µm) on one side of a transparent polyimide film (manufactured by KOLON, product name 'A_50_0', thickness 50 µm) as the window film 111 . prepared was used. The hard-coat layer 112 was formed using the coating agent for hard-coat layers. More specifically, first, a coating agent was applied to one side of the transparent polyimide film to form an application layer, and the application layer was heated together with the transparent polyimide film at 90° C. for 2 minutes. Next, the hard coat layer 112 was formed by irradiating the application layer with ultraviolet rays at an accumulated light amount of 300 mJ/cm 2 using a high-pressure mercury lamp. In this way, the window member 11 was produced. The elastic modulus (E0) of the window member calculated|required by the above-mentioned procedure was 4.7 GPa, and E0 x T0 (=0.06 mm) =0.28.

The coating agent for the hard coat layer is 100 parts by mass of a polyfunctional acrylate (manufactured by Aika Kogyo, product name 'Z-850-16') as a base resin, a leveling agent (manufactured by DIC, trade name: GRANDIC PC-4100) ) 5 mass parts and 3 mass parts of photoinitiators (the Chiba Japan company make, brand name: Irgacure 907) were mixed, and it prepared by diluting with methyl isobutyl ketone so that solid content concentration might be set to 50 mass %.

For Comparative Example 6, a sample of only the window member 11 was produced.

(b) Preparation of the optical film 12

The optical film 12 was produced in the following procedure.

(Production of polarizer 121)

As a base material made of a thermoplastic resin, an amorphous polyethylene terephthalate film (100 µm thick) containing 7 mol% of isophthalic acid units is prepared, and corona discharges on the surface with an output discharge amount of 58 W/m 2 ·min treatment was performed.

Polyvinyl alcohol containing 1% by mass of acetoacetyl-modified polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Goseimer Z200 (average degree of polymerization 1200, saponification degree 98.5 mol%, acetoacetylation degree 5 mol%)) (Polymerization degree 4200, saponification degree 99.2%) was prepared, and the aqueous coating liquid containing 5.5 mass % of polyvinyl alcohol (PVA)-type resin was prepared.

The coating solution was applied to the surface of the substrate so that the film thickness after drying was 12 μm, and dried for 10 minutes by hot air drying in an atmosphere of 60° C. to prepare a laminate in which a layer of PVA-based resin was provided on the substrate.

A stretched laminate was produced by first stretching the obtained laminate at the free end at 130°C in air at 1.8 times (air-assisted stretching). Next, the process of insolubilizing the PVA layer in which the PVA molecules contained in the stretched laminate were oriented by immersing the stretched laminate in a boric acid insolubilization aqueous solution having a liquid temperature of 30°C for 30 seconds was performed. The boric acid insolubilization aqueous solution of this process is boric acid aqueous solution whose boric acid content is 3 mass parts with respect to 100 mass parts of water. A colored laminate was produced by dyeing the obtained stretched laminate. The colored laminate is immersed in a dye solution containing iodine and potassium iodide at a liquid temperature of 30° C. for a predetermined time so that the single transmittance of the PVA layer constituting the finally produced polarizer becomes 40 to 44%. , The PVA layer contained in the stretched laminate was dyed with iodine. In this step, the dyeing solution is an aqueous solution containing iodine and potassium iodide (iodine concentration: 0.1 to 0.4 mass%, potassium iodide concentration: 0.7 to 2.8 mass%, ratio of iodine to potassium iodide concentration: 1 to 7) . Next, the process of crosslinking-processing PVA molecules of the PVA layer to which iodine was adsorbed was performed by immersing the colored laminated body in 30 degreeC boric-acid crosslinking aqueous solution for 60 second. The boric acid bridge|crosslinking aqueous solution of this process is an aqueous solution (boric acid content: 3 mass parts with respect to 100 mass parts of water, potassium iodide content: 3 mass parts with respect to 100 mass parts of water) containing boric acid and potassium iodide.

The obtained colored laminate was stretched 3.05 times in the same direction as the above-described stretching in air at a stretching temperature of 70° C. in an aqueous boric acid solution (stretching in boric acid water) to obtain a laminate having a final draw ratio of 5.50 times. The obtained layered product was taken out from the aqueous boric acid solution, and the boric acid adhering to the surface of the PVA layer was washed with an aqueous potassium iodide solution (potassium iodide content: 4 parts by mass with respect to 100 parts by mass of water). The wash|cleaned laminated body was dried by the drying process by 60 degreeC warm air. The thickness of the polarizer 121 included in the dried laminate was 5 μm.

(Formation of the protective film 122)

As the protective film 122, after shape|molding the methacryl resin pellet which has a glutarimide ring unit into a film shape by extrusion molding, the extended|stretched acrylic film was used. The thickness of the protective film was 40 µm. The protective film 122 and the polarizer 121 were bonded together using an adhesive agent (active energy ray hardening-type adhesive agent), and the polarizing plate was produced by irradiating an ultraviolet-ray under the following conditions and hardening the adhesive agent.

Gallium-encapsulated metal halide lamp: manufactured by Fusion UV Systems.Inc, trade name 'Light HAMER 10'

Valve: V valve

Peak Illuminance: 1600mW/cm2

Integrated irradiation dose: 1000mJ/cm2 (wavelength 380-440 nm)

The adhesive was prepared by mixing the following components in a proportion such that the content in 100% by mass of the adhesive became the following value, followed by stirring at 50°C for 1 hour.

Hydroxyethylacrylamide... 11.4% by mass

Tripropylene glycol diacrylate… 57.1% by mass

Acryloylmorpholine... 11.4% by mass

2-acetoacetoxyethyl methacrylate... 4.6% by mass

Acrylic polymer (ARUFON UP-1190, manufactured by Dong-A Synthesis)… 11.4% by mass

2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one… 2.8% by mass

Diethylthioxanthone… 1.3% by mass

(Production of retardation layer 123)

As the retardation layer 123, a retardation film having two layers, a retardation layer for a quarter-wave plate and a retardation layer for a half-wave plate in which a liquid crystal material is aligned and fixed, was used. As a material for forming the retardation layer for 1/2 wave plate and the retardation layer for 1/4 wave plate, a polymerizable liquid crystal material exhibiting a nematic liquid crystal phase (manufactured by BASF, trade name PaliocolorLC242) was used. The retardation layer 123 was manufactured with reference to paragraphs [0118] to [0120] of Japanese Patent Application Laid-Open No. 2018-28573.

(Production of optical film 12)

The polarizing plate and retardation layer 123 obtained above were continuously bonded together by the roll-to-roll system using the said adhesive agent (active energy ray hardening-type adhesive agent). At this time, it laminated|stacked so that the axial angle of a slow axis and an absorption axis might be 45 degrees. In this way, the optical film 12 was produced. The elastic modulus (E1) of the optical film calculated|required by the above-mentioned procedure was 4.8 GPa, and E1*T1 (=0.05 mm) =0.24.

(c) formation of an edible layer

On the surface used as the touch sensor 13 side of the optical film 12, the frame-shaped black ink layer (15 mm in width, 5 micrometers in thickness) was provided as the decorating layer 30 by screen printing. As the black ink, INQ-HF979 manufactured by Teikoku Ink Co., Ltd. was used.

(d) preparation of adhesive

The adhesives (a1)-(a3) for producing the adhesive members 21-23 were prepared in the following procedure.

(a1) Acrylic adhesive 1: Acrylic adhesive composition obtained by the following procedure

(Preparation of acrylic polymer solution)

A monomer mixture containing 99 parts by mass of butyl acrylate and 1 part by mass of 4-hydroxybutyl acrylate was placed in a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler. With respect to 100 parts by mass of this monomer mixture, 0.1 parts by mass of 2,2'-azobisisobutyronitrile as a polymerization initiator was added together with ethyl acetate. Nitrogen gas was introduced while gently stirring the resulting mixture to perform nitrogen substitution. Next, the polymerization reaction was carried out for 7 hours while maintaining the liquid temperature in the flask at around 55°C. Ethyl acetate was added to the obtained reaction solution to prepare a solution of an acrylic polymer (A1) having a weight average molecular weight of 1.6 million, adjusted to a concentration of 30 mass % of the polymer component.

(Preparation of acrylic adhesive 1)

To 100 parts by mass of the polymer component of the solution of the acrylic polymer (A1), 0.1 parts by mass of an isocyanate-based crosslinking agent (trade name: Takenate D110N, trimethylolpropane xylylene diisocyanate, manufactured by Mitsui Chemicals Co., Ltd.), a peroxide-based crosslinking agent (benzoyl) By mixing 0.3 parts by mass of peroxide (trade name: Nyper BMT, manufactured by Nippon Yushi Co., Ltd.) and 0.08 parts by mass of a silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.), acrylic adhesive 1 was prepared. .

(a2) acrylic pressure-sensitive adhesive 2: acrylic pressure-sensitive adhesive composition obtained in the following procedure

(Preparation of acrylic polymer solution)

A monomer mixture containing 94.9 parts by mass of butyl acrylate, 5 parts by mass of acrylic acid, and 0.1 parts by mass of 2-hydroxyethyl acrylate was placed in a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler. With respect to 100 mass parts of solid content of this monomer mixture, 2,2'- azobisisobutyronitrile was added with 0.1 mass part and ethyl acetate as a polymerization initiator. Nitrogen gas was introduced while gently stirring the resulting mixture to perform nitrogen substitution. Next, the polymerization reaction was carried out for 7 hours while maintaining the liquid temperature in the flask at around 55°C. Ethyl acetate was added to the obtained reaction solution to prepare a solution of an acrylic polymer (A2) having a weight average molecular weight of 2 million, in which the concentration of the polymer component was adjusted to 30% by mass.

(Preparation of acrylic adhesive 2)

To 100 parts by mass of the polymer component of the solution of the acrylic polymer (A2), 0.6 parts by mass of an isocyanate-based crosslinking agent (trade name: Coronate L, trimethylolpropantolylene diisocyanate, manufactured by Nippon Polyurethane Industries, Ltd.) and a silane coupling agent (trade name KBM403) , Shin-Etsu Chemical Co., Ltd.) 0.08 mass parts was mixed, the acrylic adhesive 2 was prepared.

(a3) Acrylic adhesive 3: Acrylic adhesive composition obtained by the following procedure

(Preparation of acrylic oligomer)

60 parts by mass of dicyclofentanyl methacrylate and 40 parts by mass of methyl methacrylate as a monomer component, 3.5 parts by mass of α-thioglycerol as a chain transfer agent, and 100 parts by mass of toluene as a polymerization solvent are mixed, and under a nitrogen atmosphere at 70° C. for 1 hour stirred. Next, 0.2 mass parts of 2,2'- azobisisobutyronitrile was put as a thermal polymerization initiator, and after making it react at 70 degreeC for 2 hours, it heated up to 80 degreeC and made it react for 2 hours. Then, the reaction liquid was heated to 130 degreeC, toluene, a chain transfer agent, and an unreacted monomer were dried off, and the solid acrylic oligomer was obtained. The weight average molecular weight of the acrylic oligomer was 5100, and the glass transition temperature (Tg) was 130°C.

(Preparation of prepolymer composition)

43 parts by mass of lauryl acrylate, 44 parts by mass of 2-ethylhexyl acrylate, 6 parts by mass of 4-hydroxybutyl acrylate, and 7 parts by mass of N-vinyl-2-pyrrolidone, and a photopolymerization initiator manufactured by BASF 0.015 mass parts of "Irgacure 184" was mixed, and the prepolymer composition (polymerization rate: about 10%) was obtained by superposing|polymerizing by irradiating an ultraviolet-ray.

(Preparation of acrylic adhesive 3)

To 100 parts by mass of the prepolymer composition, 0.07 parts by mass of 1,6-hexanediol diacrylate, 1 part by mass of the acrylic oligomer, and 0.3 parts by mass of a silane coupling agent (“KBM403J” manufactured by Shin-Etsu Chemical Co., Ltd.)) The acrylic adhesive 3 was prepared by adding a part and mixing uniformly.

(e) Formation of the pressure-sensitive adhesive layer

The adhesive layer for forming each layer of the adhesive members 21-23 was formed using the adhesive (adhesive shown in Table 1) prepared in said (d). More specifically, the pressure-sensitive adhesive shown in Table 1 was uniformly applied to the release film with a fountain coater and dried in an air circulation constant temperature oven at 155° C. for 2 minutes to form a pressure-sensitive adhesive layer on the surface of the release film. As the release film, a 38 µm-thick polyethylene terephthalate film (transparent substrate, separator) treated with a silicone-based release agent was used. The thickness of the adhesive layer was adjusted according to the application amount of the adhesive so that the thickness of each adhesive member in the sample became the value of Table 1.

(f) Fabrication of the laminate

Each member produced above was cut|disconnected to predetermined size as needed. The pressure-sensitive adhesive layer was transferred from the release film to one side of the member holding each pressure-sensitive adhesive member therebetween, and each member was laminated so as to sandwich the pressure-sensitive adhesive layer and pressed with a hand roller. In this way, the evaluation sample in which each member was laminated|stacked by the adhesive member was produced. In addition, as the touch sensor 13 and the panel member 14, respectively, the transparent polyimide film (Kolon Corporation make, product name 'A_50_O', thickness 50 micrometers) was used as a dummy. In addition, the elastic modulus (E2 (or E3)) of the transparent polyimide film calculated|required by the above-mentioned procedure was 6 GPa, and E2 (or E3) x T2 (or T3) =0.3.

(2) evaluation

(a) storage modulus of adhesive member

The storage elastic modulus of each adhesive member was calculated|required by the above-mentioned procedure. The storage elastic modulus of the adhesive member using each acrylic adhesive is as follows.

Adhesive member using acrylic adhesive 1 (a1): 0.08 MPa

Adhesive member using acrylic adhesive 2 (a2): 0.12 MPa

Adhesive member using acrylic adhesive 3 (a3): 0.03 MPa

(b) Pencil hardness test

The sample for evaluation was put on the glass plate, and the pencil hardness in the surface (surface of the hard-coat layer 112) by the side of the window member 11 was measured.

About the comparative example 6, the pencil hardness of the surface of the hard-coat layer 112 was measured using the sample only of the window member 11. FIG.

(c) Adhesiveness (flexibility)

The sample for evaluation obtained above was cut out in the strip shape of 100 mm x 20 mm with the direction of the absorption axis of a polarizing plate being the long side. The cut sample was set in a no-load U-shaped expansion tester (“small tabletop durability testing machine DLMD111LHA” and “U-shaped expansion test jig” manufactured by Yuasa Systems Co., Ltd.) so that the window member side was inside the bend, and the following conditions flexion test was performed.

Environmental conditions: 60℃ or 25℃, 55% RH

Test speed: 60rpm

Bending radius: R3

Number of bends: 100,000 times

The state of peeling in the bent portion of the sample after the test was visually observed and evaluated according to the following criteria.

A: Peeling did not generate|occur|produce between the laminated|stacked members.

B: Peeling is observed between the laminated members.

Table 1 shows the results of Examples 1-4 and Comparative Examples 1-6. In Table 1, Examples 1-4 are E1-E4, Comparative Examples 1-6 are R1-R6.

[Table 1]

As shown in Table 1, in the case of only a window member, on the surface by the side of a hard-coat layer, 4H high pencil hardness can be obtained (R6). However, when it laminates|stacks with another member via an adhesive member, the pencil hardness on the surface (specifically, the surface on the side of a hard-coat layer) on the side of a window member may fall largely to B (R2 and R3). On the other hand, when the thickness of the first adhesive member is 10 µm or less, on the surface of the window member, a decrease in pencil hardness can be suppressed, and high pencil hardness can be ensured (E1-E4, R4 and R5). . However, even if the thickness of the first adhesive member is 10 μm or less, when all the thicknesses of the adhesive members other than the first adhesive member are less than 18 μm, peeling occurs between the members laminated in a high temperature environment (60° C.), and high adhesion gender cannot be secured (R4 and R5). In contrast, when the thickness of the first adhesive member is 10 μm or less and the thickness of at least one layer other than the first adhesive member is 18 μm or more, high pencil hardness and adhesiveness in a high-temperature environment can be achieved. . Moreover, in the bending test at 25 degreeC, peeling did not occur in any of Examples 1-4 and Comparative Examples 1-5, and high adhesiveness is ensured.

<<Examples 5 to 6 and Comparative Examples 7 to 10>>

According to Examples 1-4, the sample for evaluation of the flexible image display apparatus 201 as shown in FIG. 3 was produced. As a dummy of the first touch sensor-attached panel member 15A instead of the dummy of the touch sensor 13 and the panel member 14 of Example 1, a transparent polyimide film (manufactured by Kolon, product name 'A_50_O', thickness 50) μm) was used as a dummy.

The adhesive (adhesive shown in Table 2) prepared by carrying out similarly to Examples 1-4 was used for formation of an adhesive layer. The thickness of the adhesive layer was adjusted according to the application amount of the adhesive so that the thickness of each adhesive member in a sample might become the value of Table 2.

It evaluated by carrying out similarly to Examples 1-4 using the obtained sample.

Table 2 shows the results of Examples 5 to 6 and Comparative Examples 7 to 10. In Table 2, Examples 5 to 6 are E5 to E6, and Comparative Examples 7 to 10 are R7 to R10. Table 2 also shows the results of Comparative Example 6 (R6).

[Table 2]

As shown in Table 2, in the case of only the window member, the pencil hardness on the hard-coat layer side surface is very high at 4H (R6). However, when it laminates|stacks with another member via an adhesive member, pencil hardness may fall large to B (R8). On the other hand, when the thickness of a 1st adhesive member shall be 10 micrometers or less, on the surface by the side of a window member, the fall of pencil hardness can be suppressed and high pencil hardness can be ensured (E5-E6). In addition, even if the thickness of the first adhesive member is 10 μm or less, when all the thicknesses of the adhesive members other than the first adhesive member are less than 18 μm, peeling occurs between the members laminated in a high temperature environment (60° C.), and high adhesion gender cannot be secured (R9 and R10). In contrast, when the thickness of the first adhesive member is 10 μm or less and the thickness of at least one layer other than the first adhesive member is 18 μm or more, high pencil hardness and adhesiveness in a high-temperature environment can be achieved. (E5 and E6). Moreover, in Examples 5-6 and Comparative Examples 7-10, peeling of the bending part in a bending test was not confirmed, but favorable adhesiveness was able to be ensured.

While the present invention has been described in terms of presently preferred embodiments, such disclosure should not be construed as limiting. Various modifications and variations will become apparent to those skilled in the art to which the present invention pertains upon reading the above disclosure. Accordingly, it is intended that the appended claims be construed to cover all modifications and variations without departing from the true spirit and scope of the present invention.

1, 101, 201: flexible image display device
11: No window
111: window film
112: hard coat layer
12, 12A, 12B: optical film
121: polarizer
122: protective film
123, 124: retardation layer
13: touch sensor
131: transparent conductive layer
132: transparent film
14: panel member
141: organic EL panel
142: thin film encapsulation layer
15A: Panel member with first touch sensor
15B: panel member with second touch sensor
L: first laminate
21: adhesive member (first adhesive member)
22, 23: adhesive member
30: edible layer

Claims (10)

the absence of a window;
a first member laminated on the window member;
a first laminate or a first touch sensor-attached panel member laminated on the window member with the first member interposed therebetween;
A flexible image display device comprising a plurality of layers of adhesive members, comprising:
The first laminate is a laminate of a second member laminated on the window member with the first member interposed therebetween, and a 3A member laminated on the window member with the first member and the second member interposed therebetween;
When the flexible image display device includes the first laminate,
One of the first member and the second member is an optical film, and the other is an optical film or a touch sensor,
The 3A member includes at least a panel member,
The plurality of adhesive members are disposed at least between the window member and the first member, between the first member and the second member, and between the second member and the third member 3A. comprising a layer,
When the flexible image display device includes the first touch sensor-attached panel member,
The first member is an optical film,
The multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first touch sensor-attached panel member,
When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0≤0.32,
A thickness of the first adhesive member disposed between the window member and the first member satisfies the condition of 10 μm or less,
The thickness of at least one layer other than the said 1st adhesive member among the said plurality of adhesive members satisfy|fills the condition of 18 micrometers or more, The flexible image display apparatus. According to claim 1,
and the 3A member;
One of the first member and the second member is the optical film, and the other is the touch sensor. 3. The method of claim 1 or 2,
The multi-layered adhesive member further includes at least one layer disposed in the third A member. According to claim 1,
The 3A member includes a second touch sensor-attached panel member,
The flexible image display device in which each of the said 1st member and the said 2nd member is the said optical film. 5. The method according to any one of claims 1 to 4,
The thickness of each layer of the said multiple layer adhesive member satisfy|fills the condition of 3 micrometers or more, The flexible image display apparatus. 6. The method according to any one of claims 1 to 5,
The flexible image display device whose hardness by the pencil hardness test prescribed|regulated to JISK5600-5-4:1999 on the side of the said window member is harder than F. 7. The method according to any one of claims 1 to 6,
The storage elastic modulus in 25 degreeC of each layer of the said multiple layer adhesive member satisfy|fills the conditions of 1 MPa or less, The flexible image display apparatus. 8. The method according to any one of claims 1 to 7,
The window member includes a hard coat layer,
The said hard coat layer is provided at least on the side opposite to the said 1st adhesive member side of the said window member. It is used for the flexible image display apparatus in any one of Claims 1-8,
the absence of a window;
a first member laminated on the window member;
a second laminate or a first separator laminated on the window member with the first member interposed therebetween;
An optical laminate comprising a plurality of layers of adhesive members, comprising:
The second laminate is a laminate of a second member laminated on the window member with the first member interposed therebetween, and a 3B member laminated on the window member with the first member and the second member interposed therebetween;
When the optical laminate includes the second laminate,
One of the first member and the second member is an optical film, and the other is an optical film or a touch sensor,
The 3B member includes at least a second separator,
The plurality of adhesive members are disposed at least between the window member and the first member, between the first member and the second member, and between the second member and the third member 3B. comprising a layer,
When the optical laminate includes a first separator,
The first member is an optical film,
The multi-layered adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first separator,
When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0≤0.32,
A thickness of the first adhesive member disposed between the window member and the first member satisfies the condition of 10 μm or less,
The thickness of at least one layer other than the said 1st adhesive member among the said plurality of adhesive members satisfy|fills the condition of 18 micrometers or more. 10. The method of claim 9,
and the 3B member;
One of the said 1st member and the said 2nd member is the said optical film, The other is the said touch sensor, The optical laminated body.

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