KR102401803B1 - Flexible image display apparatus and optical laminate used therefor - Google Patents

Abstract

A flexible image display apparatus is provided with a window member, a 1st member, a 1st laminated body, or a panel member with a touch sensor, and the adhesive member of multiple layers. A 1st laminated body is a laminated body of a 2nd member and 3rd A member. When the first laminate is provided, one of the first member and the second member is an optical film and the other is an optical film or a touch sensor, and the plural-layered adhesive member includes at least three layers disposed between each member. . In the case of providing a panel member with a touch sensor, the plurality of layers of the adhesive member includes at least two layers disposed between each member. E0xT0>0.32 (E0: the elastic modulus (GPa) of the window member, T0: the thickness (mm) of the window member). The thickness of at least one layer of the pressure-sensitive adhesive member is 20 µm or more, and the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side is 10 µm or more.

Description

Flexible image display apparatus and optical laminate used therefor

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

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, a fourth adhesive member AD4 is disposed between the touch sensing unit TSU and the polarizing member POL, and between the polarizing member POL and the display panel DP A second adhesive member AD2 is disposed.

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

The flexible image display device has a laminated structure in which members (a window member, an optical film, a touch sensor, a panel member, etc.) constituting the device are bonded together with an adhesive layer or an adhesive layer. The flexible image display apparatus is calculated|required by the high adhesiveness in which peeling does not arise between the members bonded together when it is made to bend repeatedly. Peeling between members becomes particularly remarkable when the flexible image display device is repeatedly bent in a high-temperature environment. In addition, when the hardness of the window member is high (or the elasticity is strong), the peeling between the members is easy to manifest.

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;

Multi-layered adhesive member

A flexible image display device 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 comprises at least a panel member,

The adhesive member of the plurality of layers is 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. including the third floor,

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

The first member is an optical film,

The plurality of layers of the adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first panel member with a touch sensor,

When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0 (kN/mm) satisfies the condition of E0×T0>0.32,

The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,

The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the adhesive members of the plurality of layers satisfies a condition of 10 µm or more.

Another aspect of the present invention is used in the 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 an adhesive member, 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 adhesive member of the plurality of layers is 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 B member. including the third floor,

When the optical laminate includes the 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 (kN/mm) satisfies the condition of E0×T0>0.32,

The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,

The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the adhesive members of the plurality of layers satisfies the condition of 10 µm or more.

When the flexible image display device provided with the window member with high hardness is repeatedly bent under a high temperature environment, high adhesiveness between the laminated|stacked 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 3A member includes at least a panel member. 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 3A. .

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 the said flexible image display apparatus is also included in this invention. An optical laminated body is provided 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 a flexible image display apparatus in the state which peeled the separator (specifically, the 2nd separator contained in a 1st separator or 3rd B member). The flexible image display device includes the optical laminate in a state in which the separator is peeled off in a state in which the window member is disposed on the viewer side.

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

A flexible image display device is required to have high adhesiveness that does not peel between the laminated constituent members when bent repeatedly. By disposing the adhesive member between the constituent members, the stress when the flexible image display device is bent can be relieved to some extent by the adhesive member. It is because an adhesive member is provided with high viscosity also in the state which bonded between each member differently from the adhesive member which adhere|attaches between each member by hardening.

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

When the hardness of the window member disposed on the viewer side of the flexible image display device is low (or weak elasticity) (specifically, in the case of E0×T0≦0.32 (kN/mm)), the adhesive member is placed in the flexible image display device. By arranging a plurality of layers, stress due to bending can be relieved. However, when the window member has high hardness (or strong elasticity) (specifically, E0×T0>0.32 (kN/mm)), the stress due to bending is not sufficiently relieved even if multiple layers of adhesive members are disposed. It became clear that there were cases where this was not the case. In addition, when the flexible image display device is repeatedly bent at room temperature (20° C. to 35° C.), even if peeling does not occur between the laminated members, peeling occurs when repeatedly bending in a high-temperature environment (for example, 60° C.), resulting in high Adhesiveness may not be ensured.

A layer of the pressure-sensitive adhesive member having a thickness of less than 10 µm (particularly, 8 µm or less, 7 µm or less, or 6 µm or less) has a low effect of relieving stress due to bending. In particular, in the case of E0×T0>0.32 (kN/mm), if the thickness of the layers of the n-th and (n+1)-th adhesive members from the window member side is less than 10 μm in succession, the adhesive having a thickness of 20 μm or more It is difficult to relieve stress due to bending even when a layer of the member is provided. In the flexible image display apparatus and optical laminated body which concern on this invention, while providing the adhesive member of at least 3 layers or at least 2 layers, the thickness of the adhesive member of at least 1 layer is controlled to 20 micrometers or more. Further, the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the plurality of layers of the adhesive member is controlled to be 10 µm or more. By providing the adhesive member of at least three layers or at least two layers, the flexibility as a whole laminated structure becomes high. In addition, by controlling the thickness of the layer of the pressure-sensitive adhesive member as described above, even in the case of E0×T0>0.32 (kN/mm), stress due to bending can be effectively relieved by the entire laminate structure. Therefore, even when the flexible image display device is repeatedly bent under a high-temperature environment, peeling between the laminated members is effectively suppressed and high adhesiveness can be ensured.

In addition, 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 laminated body or a flexible image display apparatus 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 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 of the adhesive members in each member is not specifically limited, 0 layer may be sufficient, one layer may be sufficient, and two or more layers may be sufficient as it. As described above, 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.

At least one layer having a thickness of 20 µm or more among the plurality of adhesive members may be two or more layers. By providing a layer of an adhesive member having a thickness of 20 μm or more, even in the case of E0×T0>0.32 (kN/mm), high adhesion between the laminated members when the flexible image display device is repeatedly bent under a high-temperature environment can be secured. can

The maximum value of the thickness of the adhesive member of multiple layers is 50 micrometers or less, for example, 40 micrometers or less may be sufficient as it. The flexible image display device is used with the surface of the window member exposed on the viewer side. Therefore, it is preferable that the scratch resistance of the surface on the visual recognition side of a flexible image display apparatus is high. When the flexible image display device includes a plurality of layers of the adhesive member, or when the thickness of the layer of the adhesive member is large, it is relatively easy to relieve stress due to bending. However, since it becomes difficult to return an indentation mark to an original state when an adhesive member deform|transforms, scratch resistance falls. Moreover, in the case of the hardened|cured adhesive member, relaxation of the stress similar to the case of an adhesive member does not occur easily and the fall of the scratch resistance is hardly seen. In a flexible image display apparatus, since high flexibility is calculated|required by a structural member, it is thought that the influence on the scratch resistance by a highly viscous adhesive member is easy to materialize. In the present invention, since E0xT0>0.32 (kN/mm), a certain degree of scratch resistance can be ensured. From a viewpoint of easy ensuring higher scratch resistance, 30 micrometers or less are preferable and, as for the maximum value of the thickness of a multiple layer adhesive member, it is good also as 27 micrometers or less. In addition, the scratch resistance of the surface can be evaluated by a pencil hardness test, for example.

0.32(kN/㎜)의 경우에 비하여, 플렉서블 화상 표시 장치의 시인 측의 표면을 압압하였을 때의 응력은 플렉서블 화상 표시 장치의 적층 구조 전체에서 완화되는 경향이 있다.　따라서, 보다 높은 내상성을 확보하는 관점에서는 윈도우 부재 측으로부터 1번째의 점착 부재의 층의 두께 및 복수 층의 점착 부재의 두께의 평균값을 제어하는 것이 바람직하다.The scratch resistance in the flexible image display device is measured with respect to the surface on the viewing side (more specifically, the surface on the viewing side of the window member). Therefore, the stress relaxation property of the layer of the adhesive member adjacent to the window member (that is, the first from the window member side) rather than the layer of the adhesive member located at a position away from the window member tends to affect the scratch resistance. Also, in the case of E0×T0>0.32 (kN/mm), E0×T0

Compared to the case of 0.32 (kN/mm), the stress when the surface of the flexible image display device on the viewing side is pressed tends to be relieved throughout the laminate structure of the flexible image display device. Therefore, it is preferable to control the average value of the thickness of the layer of the 1st adhesive member from the window member side, and the thickness of the adhesive member of multiple layers from a viewpoint of ensuring higher scratch resistance.

More specifically, the average value of the thickness of the adhesive member of the plurality of layers included in the flexible image display device or the optical laminate is, for example, 23 μm or less, preferably 20 μm or less from the viewpoint of securing higher scratch resistance, 20 It may be less than micrometer or 19 micrometers or less, and may be 18 micrometers or less.

20 micrometers or less are preferable and, as for the thickness of the layer of the 1st adhesive member from the window member side, it is good also as less than 20 micrometers or 17 micrometers or less, and may be 16 micrometers or less or 15 micrometers or less.

In other words, from the viewpoint of ensuring higher pencil hardness, it is preferable to provide the layer of the pressure-sensitive adhesive member having a thickness of greater than 20 µm in the second or subsequent positions from the window member side.

From the viewpoint of securing higher adhesiveness, it is advantageous to set the thickness of the layer of the adhesive member positioned on the outside more than that of the layer of the adhesive member positioned on the inside in a bent state of the flexible image display device to 20 µm or more. Therefore, from such a viewpoint, it is preferable to set the thickness of the layer of the adhesive member after the 2nd from the window member side to 20 micrometers or more.

The thickness of each layer of the pressure-sensitive adhesive member may be, for example, 3 µm or more, 5 µm or more, or 6 µm or more, respectively. When the thickness of the layer of an adhesive member is such a range, it is easy to ensure the high flexibility in a flexible image display apparatus.

Among the plurality of adhesive members, the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side may be 10 µm or more, 11 µm or more or 12 µm or more, and 14 µm or more or 15 µm or more. It may be more than micrometer. When the thickness of one of the n-th layer and the (n+1)-th layer is less than 10 µm (preferably 8 µm or less, more preferably 7 µm or less or 6 µm or less), higher adhesiveness is obtained From a viewpoint, it is preferable that the other thickness is 14 micrometers or more or 15 micrometers or more.

Further, in the flexible image display device, at least one adhesive member is formed between the first member side surface of the window member and the touch sensor or panel member with a touch sensor (specifically, a panel member with a first or second touch sensor). In some cases, an edible layer is provided so as to be in contact with the . 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.

From the viewpoint of absorbing the step difference due to the decorative layer, the thickness of the pressure-sensitive adhesive member in contact with the decorative layer may be 1.5 times or more, 2 times or more, or 2.5 times the thickness of the decorative layer.

or more, furthermore, it is good also as 3 times or more.

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 each layer 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 each layer of the pressure-sensitive adhesive member can be obtained by measuring and averaging the thicknesses at a plurality of arbitrary locations (eg, 5 locations) in the SEM image of the cross-section where the decorative layer is not formed.

The storage elastic modulus in 25 degreeC of each layer of an 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 or less 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 each layer of an adhesive member is such a range, high adhesiveness can be ensured. On the other hand, when the storage elastic modulus of the layer of an adhesive member is the said range, it is easy to relieve|moderate the stress by a pressing pressure differently from the case of the hardened adhesive member, and pencil hardness falls easily. Even when the flexible image display device includes a plurality of layers of the pressure-sensitive adhesive member that is easy to relieve the stress caused by pressing in this way, it is possible to ensure high pencil hardness to a certain extent by setting it to E0×T0>0.32 (kN/mm). Moreover, higher pencil hardness can also be ensured by controlling as mentioned above the thickness of the layer of the 1st adhesive member from the window member side, and the average thickness of multiple layers of adhesive members.

0.001 MPa or more may be sufficient as the storage elastic modulus in 25 degreeC of each layer of an adhesion member, and 0.005 MPa or more may be sufficient as it.

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

On the other hand, the storage elastic modulus in 25 degreeC of an adhesive member is larger than 10 MPa, and may be 100 MPa or more, and is usually about 1 GPa. In this specification, the adhesive member shall mean having 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), The storage modulus at 25°C is obtained. Moreover, the storage elastic modulus of an adhesive member can also be calculated|required according to the case of an adhesive member.

(Measuring conditions)

Transform Mode: Twist

Measuring frequency: 1Hz

Measuring temperature: -40℃~+150℃

Temperature increase rate: 5°C/min

In the flexible image display device according to the present invention, it is possible to ensure high pencil hardness in which the pencil hardness of the surface on the viewer side (more specifically, the surface on the viewer side of the window member) is H or more. In addition, in the flexible image display device according to the present invention, it is also possible to ensure high pencil hardness of 3H or more or 4H or more on the window member side.

In addition, pencil hardness in the present specification means scratch hardness (pencil method) prescribed in JIS K 5600-5-4:1999. Pencil hardness can be measured under the conditions of a load of 750 g weight and 25 degreeC based on JISK 5600-5-4:1999.

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 thickness of about 1.5 mm in alkali free glass (thickness 0.8-1.0 mm, 92% of total light transmittance) 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 pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a vinyl alkyl ether pressure-sensitive adhesive, a polyvinylpyrrolidone pressure-sensitive adhesive, a polyacrylamide pressure-sensitive adhesive, and a cellulose pressure-sensitive adhesive. have. 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 not limited thereto .

When the adhesive from which the storage elastic modulus as described above is obtained is used as an adhesive, since the effect by controlling the thickness of an adhesive member becomes remarkable easily, it is advantageous. The adhesive constituting at least two layers of the pressure-sensitive adhesive members among the plurality of layers of the pressure-sensitive adhesive member may be the same, or the pressure-sensitive adhesive constituting the respective pressure-sensitive adhesive members 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 to one of the members holding the respective pressure-sensitive adhesive members, or transferring the pressure-sensitive adhesive molded into a sheet shape. 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, on one side of the layer (or laminate) constituting each member and sandwiching the adhesive member, the adhesive member is disposed using application or transfer of the adhesive as described above, and the other layer (or laminate) is adhered An adhesive member is arrange|positioned in each member by sticking to a 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 (kN/mm), between the stacked members (or each member is configured when the flexible image display device is repeatedly bent under a high-temperature environment) between the layers to be used) tends to decrease. In the present invention, by controlling the thickness of the adhesive member of a plurality of layers as described above, high adhesiveness can be ensured even in the case of E0×T0>0.32 (kN/mm) or in a high-temperature environment.

The window member is typically provided with a window film. A flexible image display device or an optical laminate applied thereto is required to have high flexibility (high commutability, etc.), high transparency (high total light transmittance and low haze, etc.), and high hardness. 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 resin, polyamide-based resin, polyester-based resin, cellulose-based resin, acetate-based resin, styrene-based resin, sulfone-based resin, epoxy-based resin, polyolefin-based resin, poly and at least one selected from etheretherketone-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, transparent with respect to materials other than an adhesive member (molded object) or an adhesive 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. The total light transmittance can be measured according to the case of the 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 side opposite to the 1st member side of a window film (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.

The hard coat layer is formed by, for example, applying a curable coating agent to the surface of a base layer (eg, a window film) and curing 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 (Hereinafter, it is called 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 contain one layer of the layer A, and may contain multiple layers. The layer A is provided, for example, on the surface side of another layer or laminate (eg, window film) constituting the window member or on the side of the first 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 include 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 0.3 mm or less, and may be 0.04 mm or more and 0.2 mm or less.

The thickness T0 of the window member is measured based on the SEM image of the cross section of the flexible image display device or the optical laminate. The thickness T0 can be calculated|required by measuring and averaging the thickness at arbitrary plural 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 more and 16 GPa or less, greater than 0.6 GPa and less than 16 GPa, 1 GPa or more and 15 GPa or less, 1 GPa or more and 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 and averaging the elastic modulus of each sample by a tensile test. The tensile test can be performed under the following conditions using the following apparatus.

Tensile tester: Autograph AG-1S manufactured by Shimadzu Corporation

Control: Stroke

Gauge distance: 100mm

Tensile speed: 50mm/min

Elastic modulus calculation range: 10N/　∼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 the window member into a strip shape with a length in a direction with a high elastic modulus being 150 mm and a length in a direction having a low elastic modulus being 10 mm. For cutting the window member, for example, a multi-purpose specimen cutting machine manufactured by Dunbell Corporation is used.

E0xT0 may be larger than 0.32 kN/mm, may be 0.33 kN/mm or more, and may be 0.34 kN/mm or more, or 0.35 kN/mm or more. From the viewpoint of easily securing higher flexibility, E0 x T0 may be, for example, 1.5 kN/mm or less, or 1.0 kN/mm or less. These lower limits and upper 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 3B member), one of a 1st member and a 2nd member is an optical film, and the other may be a touch sensor. 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, an optical film may be sufficient as a 1st member. 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 the first member and the second member each satisfy the following. When the product of the elastic modulus and the thickness in each member is within such a range, the effect of controlling the thickness of each layer of the pressure-sensitive adhesive member as described above is more easily obtained.

E1×T1

0.35(kN/㎜)(제1 부재)0.01 (kN/mm)

E1×T1

0.35 (kN/mm) (first member)

E2×T2

0.35(kN/㎜)(제2 부재)0.01 (kN/mm)

E2×T2

0.35 (kN/mm) (second member)

(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 (anti-peeping) film, a luminance enhancing film, and an optical compensation film. The laminate of two or more layers may have two or more chosen from the layer which has these optical anisotropy. In a 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 is preferable that a flexible image display apparatus and an optical laminated body contain what is provided with at least a polarizer or a polarizing plate as an optical film, respectively.

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. Examples of the material constituting the polyene-based oriented film include a dehydration-treated product of a polyvinyl alcohol-based resin and a dehydrochloric acid-treated product of a polyvinyl chloride-based resin.

As the polarizer, a thin polarizer having a thickness of 10 µm or less may be used. As thin polarized photons, for example, Japanese Patent Application Laid-Open No. 51-069644, Japanese Patent Application Laid-Open No. 2000-338329, International Publication No. 2010/100917 pamphlet, Japanese Patent Publication No. 4691205, Japanese Patent Publication No. 4751481 The described polarizer is mentioned. A thin polarizer can be obtained by the manufacturing method containing the process of extending|stretching, for example in the state which laminated|stacked the polyvinyl alcohol-type resin layer and the resin base layer, 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 poly Amide-based resins, polycarbonate-based resins, polyester-based resins (including polyarylate-based resins), acetate-based resins, polyethersulfone-based resins, polyvinyl chloride-based resins, polyvinylidene chloride-based resins, polystyrene-based resins, At least one selected from the group consisting of polyvinyl alcohol-based resins, sulfide-based resins (eg, polyphenylene sulfide-based resins), polyetheretherketone-based resins, epoxy-based resins, and urethane-based resins 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 two or more layers of protective films are included in the optical film (for example, when protective films are disposed on both surfaces of a 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 and the like. 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 the said optical anisotropy. Specific examples of the layer B include a retardation layer, a viewing angle magnifying film, a viewing angle limiting (peep-preventing) film, a luminance enhancing film, and an optical compensation film. The optical film may contain one such layer B, and may contain two or more. However, layer B is not limited to these.

The layer B may be laminated|stacked on the polarizing plate through a protective film, and may be laminated|stacked on the polarizer without interposing a protective film. When the polarizing plate does not contain a protective film, the layer B has a function as a protective film.

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 the polarizing plate is, for example, 200 µm or less. From a viewpoint of being easy to ensure higher 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 the polarizing plate is, for example, 10 µm or more.

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, one used, for example in the field of an image display apparatus, etc. is used. 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, when a capacitive touch sensor is used, high sensitivity is easy to be acquired.

Capacitive touch sensors typically include a transparent conductive layer. 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. Resin, 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), polyetheretherketone-based resin, cellulose A system resin, an epoxy resin, a 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 (cleaning treatment using a solvent or ultrasonic waves, etc.).

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 optical function (such as an optically anisotropic film), a layer having the 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 entire touch sensor may be, for example, 5 µm or more and 250 µm or less, and may be 10 µm or more and 200 µm or less.

(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 3rd A member may be a laminated body of a panel member and the protection member which protects a panel member, for example. 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 expression.

E3×T3

0.35(kN/㎜)0.01 (kN/mm)

E3×T3

0.35 (kN/mm)

3A member WHEREIN: When the product of an elastic modulus and thickness is such a range, the effect by controlling the thickness of an adhesive member as mentioned above becomes more easy to be acquired.

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.

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.

(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. 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 of the resin sheet is not particularly limited, and may be appropriately selected according to, for example, the type of the 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 included in 3A member) is a touch sensor and a panel member integrated. 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 of the resin sheet is not particularly limited, and may be appropriately selected according to, for example, the type of the 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.

Ep×Tp

0.350.01

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. A separator is arrange|positioned in the state which a release agent contacted with an 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 what the layer of a release agent can form 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 according to the type of the 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. A well-known thing can be used as a release agent, 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 the window member and the touch sensor or the panel member with a touch sensor (more specifically, the panel member with a first touch sensor or the panel member with a second touch sensor) in contact with at least one adhesive member arranged to do In addition, when the adhesive member is contained in the 1st member, you may arrange|position so that it may contact with this adhesive member. For example, the decorative layer may be formed on at least one of the first member side surface of the window member and the window member side surface of the first member. In addition, when a 1st member is an optical film, when the surface of the 1st laminated body side or the 1st touch sensor panel member side (or 1st separator side) of a 1st member, and a 2nd member are an optical film, You may form a decoration layer in at least one of the surface of the 3A member side (or 3B member side) of 2 members. When the first member is an optical film and a layer of an adhesive member is included in the first member, a decorative layer may be formed on the surface in contact with at least one of the layers of the adhesive member interposed therebetween. . When the second member is an optical film and a layer of an adhesive member is included in the second member, a decorative layer may be formed on the surface in contact with at least one adhesive member among the layers interposing the layer of the adhesive member. . The decorative layer may be formed on at least one surface among the surfaces of these members and layers, and may be formed on two or more surfaces. 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, it is calculated|required by the decorative layer 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 contains, 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 lower limits and upper limits can be combined arbitrarily.

The decorative layer may be formed, for example, by applying a coating agent containing the constituent components of the decorative layer to the surface of the member or layer on which the decorative layer is formed. In addition, you may form a decorating layer by depositing a structural component on the surface of the member or layer in which the said decorating layer is formed by a vapor phase method. In the case of a metal thin film, in particular, a small decorative layer can be easily formed by using a vapor phase method. As the vapor phase method, a sputtering method, a vacuum vapor deposition method, a chemical vapor deposition (CVD:Chemical Vapor Deposition) method, an electron beam vapor deposition method, etc. are mentioned.

A primer layer may be disposed on the surface of the member or layer on which the decorative layer is formed prior to application of the coating agent. 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 decorating 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 decorating layer and the first member on the first laminate side or the first 1 A primer layer may be arrange|positioned between the surface of the panel member side with a touch sensor (or 1st separator side). The primer layer contains, for example, at least one selected from the group consisting of a metal compound (metal oxide, metal nitride, metal carbide, 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 stacking order is not particularly limited.

For example, the window member and the first member may be laminated with the adhesive member interposed between these members, and then the first and second members may be laminated with the adhesive member interposed between these members. In addition, 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 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 adhesive 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 a flexible 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 mere examples, 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, it can manufacture by laminating|stacking each member according to these manufacturing methods.

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 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 and the thickness T0 of the window member 11 satisfies E0×T0>0.32 (kN/mm).

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 sealing 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 device 1 and the optical laminate, it is E0xT0>0.32 (kN/mm), and it is controlled so that the thickness of at least 1 layer among the adhesive members 21-23 may satisfy|fill the conditions of 20 micrometers or more. Moreover, the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the adhesive members 21-23 is controlled so that the condition of 10 micrometers or more may be satisfied. Therefore, even when the flexible image display device is repeatedly bent under a high-temperature environment, high adhesion between the laminated members can be ensured. Moreover, comparatively high pencil hardness can also be ensured in the surface by the side of the window member 11 of the flexible image display apparatus 1 and an optical laminated body.

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, although the case where the decorative layer 30 is formed in the surface of the touch sensor 13 side of the optical film 12 in FIG. 1 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 contains 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 composed of a polarizer 121 and a protective film 122 . 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.

Also in the second embodiment, as in the first embodiment, E0xT0>0.32 (kN/mm), and it is controlled so that the thickness of at least one layer among the adhesive members 21-23 may satisfy|fill the condition of 20 micrometers or more. Moreover, it is controlled so that the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the adhesive members 21-23 may satisfy|fill the condition of 10 micrometers or more. Therefore, even when the flexible image display device is repeatedly bent under a high-temperature environment, high adhesion between the laminated members can be ensured. Moreover, comparatively high pencil hardness can also be ensured in the surface by the side of the window member 11 of the flexible image display apparatus 1 and 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 the third embodiment, E0xT0>0.32 (kN/mm), and the thickness of at least one of the adhesive members 21 and 22 is controlled to satisfy the condition of 20 µm or more. Moreover, it is controlled so that the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side among the adhesive members 21 and 22 may satisfy|fill the condition of 10 micrometers or more. Therefore, similarly to the case of the first and second embodiments, high adhesiveness between the laminated members can be ensured, and the flexible image display device 1 and the optical laminate of the window member 11 side On the surface, a relatively high pencil hardness 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 6, Comparative Examples 1 to 5, and Reference Examples 1 to 2>>

(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, what provided the acrylic hard-coat layer 112 (10 micrometers in thickness) on the single side|surface of the transparent polyimide film as the window film 111 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 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, 5 parts by mass of a leveling agent (manufactured by DIC, trade name 'GRANDIC PC-4100') , and 3 parts by mass of a photoinitiator (manufactured by Chiba Japan, trade name "Irugacure 907") were mixed, and it prepared by diluting with methyl isobutyl ketone so that a dry solid content concentration might be set to 50 mass %.

In Examples and Comparative Examples, a transparent polyimide film manufactured by KOLON, product name 'A_50_O', and a thickness of 80 µm was used. The elastic modulus (E0) of the window member of Examples and Comparative Examples obtained in the above-described order was 4.0 GPa. In Examples and Comparative Examples, E0 x T0 (=0.09 mm) = 0.36 kN/mm.

In the reference example, the KOLON company make, product name 'A_50_O', and thickness 50 micrometers were used as a transparent polyimide film. The elastic modulus (E0) of the window member of the reference example calculated|required by the above-mentioned procedure was 4.7 GPa. In the reference example, E0 x T0 (=0.06 mm) = 0.28 kN/mm.

(b) Preparation of the optical film 12

The optical film 12 was produced in the following procedure.

(Production of polarizer 121)

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

Polyvinyl alcohol containing 1% by mass of acetoacetyl-modified polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Gosefaimer 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, by immersing the stretched laminate in an aqueous boric acid insolubilization solution having a liquid temperature of 30°C for 30 seconds, a step of insolubilizing the PVA layer in which the PVA molecules contained in the stretched laminate were oriented 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 included 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 the PVA molecules of the PVA layer which made the iodine adsorb|sucked by immersing the colored laminated body in 30 degreeC boric-acid crosslinking aqueous solution for 60 second was performed. The boric acid 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 in a boric acid aqueous solution at a stretching temperature of 70° C. by 3.05 times in the same direction as stretching in the air (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, product name: 'Light HAMMER10'

Valve: V valve

Peak Illuminance: 1600 mW/cm ²

Integrated irradiation dose: 1000mJ/cm ² (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

Acroylmorpholine... 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 of 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 (manufactured by BASF, trade name Paliocolor LC242) exhibiting a nematic liquid crystal phase 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 obtained above and the retardation layer 123 were continuously bonded together by the roll-to-roll method 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 x T1 (=0.05 mm) = 0.24 kN/mm.

(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 Imperial 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 introduced into 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 this monomer mixture, 0.1 mass parts of 2,2'- azobisisobutyronitrile was added with 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 performed for 7 hours while maintaining the liquid temperature in the flask at around 55°C. Ethyl acetate was added to the obtained reaction liquid, and the solution of the acrylic polymer A1 of 1.6 million weight average molecular weight adjusted to 30 mass % of density|concentration of a polymer component was prepared.

(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, trimethylolpropanexylylenediisocyanate, manufactured by Mitsui Chemicals Co., Ltd.), a peroxide-based crosslinking agent (benzoyl peroxide) (Brand name: Nyper BMT, manufactured by Nippon Oil Co., Ltd.)) 0.3 parts by mass 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 introduced into a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube, and a cooler. . To 100 parts by mass of the dry solid content of the monomer mixture, 2,2'-azobisisobutyronitrile as a polymerization initiator was added together with 0.1 parts by mass and 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 A2 having a weight average molecular weight of 2,000,000, which adjusted the concentration of the polymer component to 30% by mass.

(Preparation of acrylic adhesive 2)

With respect 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 Co., Ltd.) and a silane coupling agent (trade name: KBM403, Shin-Etsu) The acrylic adhesive 2 was prepared by mixing 0.08 mass parts of Chemical Industries, Ltd. product).

(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 1 at 70° C. under a nitrogen atmosphere. time was stirred. Next, 0.2 mass parts of 2,2'-azobisisobutyronitrile was added 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 parts by mass of "Irugacure 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.) were added, Acrylic adhesive 3 was prepared by 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-circulating 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 a sample might become the value of Table 1.

(f) Fabrication of the laminate

Each member produced above was cut to a 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, and each member was laminated so that the pressure-sensitive adhesive layer was sandwiched therebetween, and was crimped with a hand roller. In this way, the sample for evaluation 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 (made by KOLON, 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, E2 (or E3) x T2 (or T3) = 0.3 kN/mm.

(2) evaluation

(a) storage modulus of adhesive member

The storage modulus of each adhesive member was calculated|required in the above-mentioned order. 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.

(c) adhesiveness

The evaluation sample obtained above was cut out in 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 is set so that the window member side becomes the inside of the bend 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.), under the following conditions A bending test was performed.

Environmental conditions: 60℃, 55%RH

Test speed: 60rpm

Bend 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 to 6, Comparative Examples 1 to 5, and Reference Examples 1-2. In these tables, e1 to e6 are Examples 1 to 6, c1 to c5 are Comparative Examples 1 to 5, and r1 to r2 are Reference Examples 1 to 2.

[Table 1]

0.32(kN/㎜)의 경우에는, 두께가 20㎛ 이상인 점착 부재의 층을 갖지 않는 경우 및 두께가 10㎛ 미만인 점착 부재의 층이 연속하는 경우에도 높은 접착성을 얻을 수 있다(r1 및 r2).　그러나, 점착 부재의 층의 두께가 r1 및 r2와 동일하여도, E0×T0>0.32(kN/㎜)인 경우에는 적층된 부재 사이에서 박리가 생긴다(c3 및 c5).　또한, 표 1에 나타내는 바와 같이, 두께가 비교적 큰(구체적으로는 15㎛인) 점착 부재의 층을 복수 층 갖는 경우에도, 적층된 부재 사이에서의 박리를 억제할 수는 없다(c1 및 c4).As shown in Table 1, E0 × T0

In the case of 0.32 (kN/mm), high adhesiveness can be obtained even when there is no layer of the pressure-sensitive adhesive member having a thickness of 20 μm or more and when the layers of the pressure-sensitive adhesive member having a thickness of less than 10 μm are continuous (r1 and r2) . However, even if the thickness of the layer of the adhesive member is equal to r1 and r2, peeling occurs between the laminated members when E0xT0>0.32 (kN/mm) (c3 and c5). Further, as shown in Table 1, even in the case of having a plurality of layers of the pressure-sensitive adhesive member having a relatively large thickness (specifically, 15 µm), peeling between the laminated members cannot be suppressed (c1 and c4). .

On the other hand, in the embodiment, the thickness of at least one layer of the plurality of adhesive members is 20 µm or more, and the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side is 10 µm or more. . With such a configuration, even in the case of E0×T0>0.32 (kN/mm), no peeling was found between the laminated members in the bending test under a high-temperature environment, and high adhesion can be ensured (e1 to e6). ). Also, even when the sample contains a layer of the pressure-sensitive adhesive member having a small thickness of less than 10 µm, high adhesiveness can be ensured (e1 and e3).

In any Example, the high pencil hardness of 3H or more is ensured. It is preferable that it is 20 micrometers or less or less than 20 micrometers, and, as for the average value of the thickness of the adhesive member of multiple layers from a viewpoint of ensuring higher pencil hardness, 19 micrometers or less or 18 micrometers or less are more preferable. From the same viewpoint, the thickness of the first layer from the window member side (that is, the adhesive member 21) is preferably 20 µm or less or less than 20 µm, more preferably 17 µm or less, and 16 µm or less or 15 µm. The following are more preferable.

<<Examples 7 to 12, Comparative Examples 6 to 9, and Reference Examples 3 to 4>>

According to Examples 1-6, 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) which carried out similarly to Examples 1-6, and prepared 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.

In Examples and Comparative Examples, a transparent polyimide film made by KOLON, product name 'A_50_O', and having a thickness of 80 µm was used as the window member. The elastic modulus (E0) of the window member of Examples and Comparative Examples obtained in the above-described order was 4.0 GPa. In Examples and Comparative Examples, E0 x T0 (=0.09 mm) = 0.36 kN/mm.

In the reference example, a transparent polyimide film made by KOLON, product name 'A_50_O', and having a thickness of 50 µm was used as the window member. The elastic modulus (E0) of the window member of the reference example obtained by the above-mentioned procedure was 4.7 GPa. In the reference example, E0 x T0 (=0.06 mm) = 0.28 kN/mm.

The obtained samples were evaluated in the same manner as in Examples 1 to 6. Table 2 shows the results of Examples 7 to 12, Comparative Examples 6 to 9, and Reference Examples 3-4. In Table 2, Examples 7 to 12 are e7 to e12, Comparative Examples 6 to 9 are c6 to c9, and Reference Examples 3 to 4 are r3 to r4.

[Table 2]

0.32(kN/㎜)인 경우에는, 두께가 20㎛ 이상인 점착 부재의 층을 갖지 않는 경우 및 두께가 10㎛ 미만인 점착 부재의 층이 연속하는 경우에도, 높은 접착성을 얻을 수 있다(r4 및 r3).　그러나, 점착 부재의 층의 두께가 r3 및 r4와 동일하여도, E0×T0>0.32(kN/㎜)인 경우에는 적층된 부재 사이에서 박리가 생긴다(c7 및 c9).　또한, 표 2에 나타나는 바와 같이, 두께가 비교적 큰(구체적으로는 15㎛인) 점착 부재의 층을 복수 층 갖는 경우에도 적층된 부재 사이에서의 박리를 억제할 수는 없다(c6 및 c8).As shown in Table 2, E0×T0

In the case of 0.32 (kN/mm), high adhesiveness can be obtained even when there is no layer of the pressure-sensitive adhesive member having a thickness of 20 μm or more, and even when the layers of the pressure-sensitive adhesive member having a thickness of less than 10 μm are continuous (r4 and r3). ). However, even when the thickness of the layer of the adhesive member is equal to r3 and r4, peeling occurs between the laminated members when E0×T0>0.32 (kN/mm) (c7 and c9). Further, as shown in Table 2, even in the case of having a plurality of layers of the pressure-sensitive adhesive member having a relatively large thickness (specifically, 15 µm), peeling between the laminated members cannot be suppressed (c6 and c8).

On the other hand, in the embodiment, the thickness of at least one layer of the plurality of adhesive members is 20 µm or more, and the thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side is 10 µm or more. do. With such a configuration, even when E0×T0>0.32 (kN/mm), no peeling was found between the laminated members in the bending test under a high-temperature environment, and high adhesion can be ensured (e7 to e12). ). Also, even when the sample contains a layer of the pressure-sensitive adhesive member having a small thickness of less than 10 µm, high adhesiveness can be ensured (e7 and e9).

In any Example, the high pencil hardness of 3H or more is ensured. From a viewpoint of ensuring higher pencil hardness, it is preferable that the thickness of the layer of the 1st adhesive member from the window member side is 20 micrometers or less, and it is preferable that the average value of the thickness of the adhesive member of multiple layers is 20 micrometers or less.

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, the appended claims are to 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, 22, 23: adhesive member
30: edible layer

Claims (19)

A window member provided with a transparent resin film, and
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;
Multi-layered adhesive member
A flexible image display device 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 comprises at least a panel member,
The adhesive member of the plurality of layers is 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. including the third floor,
When the flexible image display device includes the first touch sensor-attached panel member,
The first member is an optical film,
The plurality of layers of the adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first panel member with a touch sensor,
When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0 (kN/mm) satisfies the condition of E0×T0>0.32,
The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,
The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side of the plurality of layers of the adhesive member satisfies the condition of 10 μm or more,
The average value of the thickness of the said plurality of layers of adhesive members satisfies the condition of 23 micrometers or less. According to claim 1,
The elastic modulus (E0) of the window member is 0.53 GPa or more and 16 GPa or less. According to claim 1,
Among the adhesive members of the plurality of layers, the thickness of the first layer from the side of the window member satisfies the condition of 20 μm or less,
An average value of the thickness of the plurality of layers of the adhesive member satisfies a condition of 20 µm or less. the absence of a window;
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;
Multi-layered adhesive member
A flexible image display device 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 comprises at least a panel member,
The adhesive member of the plurality of layers is 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. including the third floor,
When the flexible image display device includes the first touch sensor-attached panel member,
The first member is an optical film,
The plurality of layers of the adhesive member includes at least two layers disposed between the window member and the first member and between the first member and the first panel member with a touch sensor,
When the elastic modulus (GPa) of the window member is E0 and the thickness (mm) of the window member is T0, E0×T0 (kN/mm) satisfies the condition of E0×T0>0.32,
The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,
The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side of the plurality of layers of the adhesive member satisfies the condition of 10 μm or more,
The thickness of the first adhesive member layer from the window member side satisfies the condition of 20 μm or less. 5. The method of claim 4,
The average value of the thickness of the said plurality of layers of adhesive members satisfies the condition of 23 micrometers or less. 6. The method of claim 5,
An average value of the thickness of the plurality of layers of the adhesive member satisfies a condition of 20 µm or less. 7. The method according to any one of claims 1 to 6,
and the 3A member;
One of the first member and the second member is the optical film, and the other is the touch sensor. 7. The method according to any one of claims 1 to 6,
The plurality of layers of the adhesive member further includes at least one layer disposed in the third A member. 7. The method according to any one of claims 1 to 6,
The 3A member includes a second touch sensor attached panel member,
Each of the first member and the second member is the optical film. 7. The method according to any one of claims 1 to 6,
The maximum value of the thickness of the adhesive member having the largest thickness among the plurality of layers of the adhesive member satisfies a condition of 50 μm or less. 7. The method according to any one of claims 1 to 6,
The storage elastic modulus at 25 degreeC of each layer of the said multiple-layered adhesive member satisfy|fills the condition of 1 MPa or less, The flexible image display apparatus. 7. The method according to any one of claims 1 to 6,
A thickness of each layer of the plurality of layers of the adhesive member satisfies the condition of 3 µm or more. 7. The method according to any one of claims 1 to 6,
E0xT0 is a flexible image display apparatus which regulates the pencil hardness prescribed|regulated to JISK5600-5-4:1999 on the surface of the said window member side. 7. The method according to any one of claims 1 to 6,
The flexible image display device in which the hardness by the pencil hardness test prescribed|regulated to JISK5600-5-4:1999 on the said window member side is H or more. 7. The method according to any one of claims 1 to 6,
The window member has a hard coat layer,
The said hard coat layer is provided at least on the side opposite to the said 1st member side of the said window member. It is used for the flexible image display apparatus in any one of Claims 1-3,
A window member provided with a transparent resin film, and
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 an adhesive member, 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 adhesive member of the plurality of layers is 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 B member. including the third floor,
When the optical laminate includes the 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 (kN/mm) satisfies the condition of E0×T0>0.32,
The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,
The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side of the plurality of layers of the adhesive member satisfies the condition of 10 μm or more,
The average value of the thickness of the said plurality of layers of adhesive members satisfies the condition of 23 micrometers or less. 17. The method of claim 16,
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. It is used for the flexible image display apparatus in any one of Claims 4-6,
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 an adhesive member, 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 adhesive member of the plurality of layers is 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 B member. including the third floor,
When the optical laminate includes the 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 (kN/mm) satisfies the condition of E0×T0>0.32,
The thickness of at least one layer of the plurality of layers of the adhesive member satisfies the condition of 20 μm or more,
The thickness of at least one of the n-th layer and the (n+1)-th layer from the window member side of the plurality of layers of the adhesive member satisfies the condition of 10 μm or more,
The thickness of the first adhesive member layer from the window member side satisfies the condition of 20 μm or less. 19. The method of claim 18,
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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