KR20220150282A - Circular Polarizer and Optical Laminate - Google Patents

Abstract

The present invention is a circularly polarizing plate that can suppress that the color of reflected light differs when observed from the diagonal direction compared to when observed from the front even after exposure to bending in a display device such as a flexible display, optical laminate and a display device. A circularly polarizing plate contains the optical layer containing a linearly polarizing layer at least, a 1st bonding layer, a 1st phase difference layer, a 2nd bonding layer, and a 2nd phase difference layer in this order. The first retardation layer includes a first liquid crystal layer that is a layer of a cured product of a polymerizable liquid crystal compound. The elastic modulus in the temperature of 25 degreeC of a 1st bonding layer and a 2nd bonding layer is G'1 [kPa] and G'2 [kPa], respectively, The thickness of a 1st bonding layer and a 2nd bonding layer is d1 [micrometer], respectively. and d2 [μm], the relation of the following formula (1) is satisfied. G'1/d1 ＜ G'2/d2 (One)

Description

Circular Polarizer and Optical Laminate

The present invention relates to a circularly polarizing plate, an optical laminate, and a display device.

DESCRIPTION OF RELATED ART In the display apparatus represented by organic electroluminescence (EL) display apparatus, the flexible display which made the bending|flexion etc. of a display apparatus possible using the material which has flexibility is known (for example, patent Literature 1, 2). In an organic EL display device, in order to suppress the fall of visibility by reflection of external light, it is known to use a circular polarizing plate etc. to improve antireflection performance. A circularly polarizing plate can be obtained by laminating|stacking a linear polarizing plate and retardation layer, and the hardened|cured material layer of a polymeric liquid crystal compound may be used as retardation layer.

Japanese Patent Laid-Open No. 2019-91021 Japanese Patent Laid-Open No. 2019-91091

The circularly polarizing plate provided with the retardation layer of the hardened|cured material layer of a polymeric liquid crystal compound as mentioned above is an optical laminated body bonded to the front plate etc. which comprise the outermost surface of a display device, It is knitted|organized in a flexible display, and linearly polarized light of a circularly polarizing plate. It may be repeatedly bent so that the layer side becomes inside. In the flexible display exposed to such curvature, compared with the hue (color taste) of the reflected light at the time of observing from the front, the hue of the reflected light at the time of observing from a diagonal direction may differ.

The present invention provides a circular polarizing plate capable of suppressing a difference in the color of reflected light when viewed from the diagonal direction compared to when observed from the front even after exposure to a bend in a display device such as a flexible display, comprising the same It aims at provision of an optical laminated body and a display device.

MEANS TO SOLVE THE PROBLEM This invention provides the following circularly polarizing plate, an optical laminated body, and a display device.

[1] A circularly polarizing plate comprising at least an optical layer including a linearly polarizing layer, a first bonding layer, a first phase difference layer, a second bonding layer, and a second phase difference layer in this order,

The first retardation layer includes a first liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound,

The elastic modulus in the temperature of 25 degreeC of a said 1st bonding layer and a said 2nd bonding layer is G'1 [kPa] and G'2 [kPa], respectively, The thickness of a said 1st bonding layer and a said 2nd bonding layer is respectively A circularly polarizing plate which satisfies the relationship of the following formula (1) when d1 [micrometer] and d2 [micrometer].

G'1/d1 ＜ G'2/d2 (One)

[2] The thickness of the first retardation layer is t [㎛],

In the cross section of the bent part of the said circularly polarizing plate after a bending test, between the position closest to the said optical layer side among the surfaces by the side of the said 1st bonding layer of the said 1st retardation layer, and the position farthest from the said optical layer side The circularly polarizing plate according to [1], wherein when the distance in the thickness direction of is ΔS [μm], the relationship of the following formula (2) is satisfied.

ΔS ≤ 2t (2)

[3] A circularly polarizing plate comprising at least an optical layer containing a linearly polarizing layer, a first bonding layer, a first phase difference layer, a second bonding layer, and a second phase difference layer in this order,

The first retardation layer includes a first liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound,

The thickness of the first retardation layer is t [㎛],

In the cross section of the bent part of the said circular polarizing plate after a bending test, among the surfaces of the said 1st bonding layer side of the said 1st retardation layer, the thickness direction between the position closest to the said optical layer side and the position furthest from the said optical layer side A circularly polarizing plate that satisfies the relationship of the following formula (2) when the distance is ΔS [μm].

ΔS ≤ 2t (2)

[4] The circularly polarizing plate according to any one of [1] to [3], wherein the second retardation layer includes a second liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound.

[5] The circularly polarizing plate according to any one of [1] to [4], wherein the thickness of the first retardation layer is 5 µm or less.

[6] The circularly polarizing plate according to any one of [1] to [5], wherein the linearly polarizing layer contains a cured product of a polymerizable liquid crystal compound and a dichroic dye.

[7] The circularly polarizing plate according to any one of [1] to [6], wherein the optical layer is a polarizing plate having a protective layer on one or both surfaces of the linearly polarizing layer.

[8] The first retardation layer and the second retardation layer are the following [a] or [b]:

[a] The first retardation layer is a 1/2 wave plate, and the second retardation layer is a 1/4 wave plate,

[b] One of the first retardation layer and the second retardation layer is a 1/4 wave plate having reverse wavelength dispersion, and the other is a positive C plate,

The circularly polarizing plate according to any one of [1] to [7], which satisfies the relationship of

[9] The first retardation layer is a 1/4 wave plate having reverse wavelength dispersion,

The circularly polarizing plate according to any one of [1] to [8], wherein the second retardation layer is a positive C plate.

[10] An optical laminate comprising the circularly polarizing plate according to any one of [1] to [9], and a front plate laminated on the optical layer side of the circularly polarizing plate.

[11] A display device comprising the optical laminate according to [10].

According to the present invention, even after being exposed to bending in a display device such as a flexible display, it is possible to provide a circular polarizing plate capable of suppressing a difference in the color of reflected light when viewed from the diagonal direction compared to when observed from the front. can

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows typically an example of the circularly polarizing plate of this invention.
It is a schematic sectional drawing for demonstrating an example at the time of returning a bending state after the bending test of a circularly polarizing plate.
It is a schematic sectional drawing which shows typically an example of the optical laminated body of this invention.
4 (a) and (b) are schematic diagrams for explaining the method of the bending test.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described referring drawings, this invention is not limited to the following embodiment. All the drawings below are shown to aid understanding of the present invention, and the size and shape of each component shown in the drawing does not necessarily correspond to the size or shape of the actual component.

(Circular Polarizer)

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows typically an example of the circularly polarizing plate of this embodiment. It is a schematic sectional drawing for demonstrating an example at the time of returning a bending state after the bending test of a circularly polarizing plate. The circularly polarizing plate 1 is, as shown in FIG. 1, the optical layer 30 containing the linearly polarizing layer 31 at least, the 1st bonding layer 21, the 1st retardation layer 11, and the 2nd bonding layer. (22), and the second retardation layer 12 in this order. The first retardation layer 11 includes a first liquid crystal layer which is a layer of a cured product of a polymerizable liquid crystal compound.

The circularly polarizing plate 1 satisfies at least one of <i> and <ii> shown below. The circularly polarizing plate 1 may satisfy only one of <i> and <ii>, but it is preferable to satisfy both <i> and <ii>.

<i> The elastic modulus in the temperature of 25 degreeC of the 1st bonding layer 21 is G'1 [kPa], The elastic modulus in the temperature of 25 degreeC of the 2nd bonding layer 22 is G'2 [kPa], When the thickness of the 1 bonding layer 21 is d1 [micrometer] and the thickness of the 2nd bonding layer 22 is d2 [micrometer], the circularly polarizing plate 1 is following formula (1):

G'1/d1 ＜ G'2/d2 (One)

satisfy the relationship of

<ii> The thickness of the first retardation layer 11 of the circularly polarizing plate 1 is t [㎛],

In the cross section of the bent part of the said circular polarizing plate after a bending test, the position closest to the optical layer 30 side among the surfaces on the 1st bonding layer 21 side of the 1st retardation layer 11, and the optical layer 30 side When the distance in the thickness direction between the furthest positions is ΔS [μm], the circularly polarizing plate 1 has the following formula (2):

ΔS ≤ 2t (2)

satisfy the relationship of

The optical layer 30 may include at least the linearly polarizing layer 31 , and may include a polarizing plate having a protective layer on one or both surfaces of the linearly polarizing layer 31 , or may be the polarizing plate itself.

The linearly polarizing layer 31 may contain a polyvinyl alcohol-type resin film, and may contain the hardened|cured material of a polymerizable liquid crystal compound, and a dichroic dye. In the circularly polarizing plate 1 shown in FIG. 1, the case where the optical layer 30 is a polarizing plate which has protective layers 32 and 33 on both surfaces of the linearly polarizing layer 31 is mentioned as an example, and it has shown.

The 1st bonding layer 21 is a layer for bonding the optical layer 30 and the 1st retardation layer 11, and may be in direct contact with the optical layer 30 and the 1st retardation layer 11. The 1st bonding layer 21 is an adhesive layer or an adhesive bond hardened layer, and it is preferable that it is an adhesive layer.

The elastic modulus G'1 in the temperature of 25 degreeC of the 1st bonding layer 21 may be 10 kPa or more, 20 kPa or more may be sufficient, and 30 kPa or more may be sufficient, for example. The elastic modulus G'1 may be, for example, 3 × 10 ⁶ kPa or less, 2 × 10 ⁶ kPa or less, 1 × 10 ⁶ kPa or less, 5 × 10 ⁵ kPa or less, and 1 × 10 ⁵ kPa or less, for example. or less, may be 1 × 10 ⁴ kPa or less, may be 5 × 10 ³ kPa or less, may be 3 × 10 ³ kPa or less, may be 2 × 10 ³ kPa or less, may be 1 × 10 ³ kPa or less, may be 1 × 10 3 kPa or less, 800 It may be less than kPa. The elastic modulus G'1 can be measured in accordance with the method described in Examples to be described later.

When the 1st bonding layer 21 is an adhesive layer, 10 kPa or more may be sufficient as said elastic modulus G'1, for example, 20 kPa or more may be sufficient, 30 kPa or more may be sufficient, and 5*10 ³ kPa or less may be sufficient as for the said elastic modulus G'1, for example. 3 × 10 ³ kPa or less may be sufficient, 2 × 10 ³ kPa or less may be sufficient, 1 × 10 ³ kPa or less may be sufficient, and 800 kPa or less may be sufficient. When the 1st bonding layer 21 is an adhesive agent hardening layer, the said elastic modulus G'1 may be 1x10 ⁵ kPa or more, for example, 5x10 ⁵ kPa or more may be sufficient, and 3x10 ⁶ kPa or less may be sufficient as it, for example. may be, 2 × 10 ⁶ kPa or less may be sufficient, and 1 × 10 ⁶ kPa or less may be sufficient.

When the 1st bonding layer 21 is an adhesive layer, the thickness d1 of the 1st bonding layer 21 may be 3 micrometers or more, for example, 5 micrometers or more, and 10 micrometers or more may be sufficient, and further, for example For example, 50 micrometers or less may be sufficient, 40 micrometers or less may be sufficient, 30 micrometers or less may be sufficient, and 25 micrometers or less may be sufficient. When the 1st bonding layer 21 is an adhesive agent hardening layer, thickness d1 of the 1st bonding layer 21 may be 0.01 micrometer or more, for example, 0.1 micrometer or more may be sufficient, 0.5 micrometer or more may be sufficient, and 1 micrometer or more It may be, and for example, 20 micrometers or less may be sufficient, 15 micrometers or less may be sufficient, 10 micrometers or less may be sufficient, and 5 micrometers or less may be sufficient.

The first retardation layer 11 includes a first liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound as described above. The first phase difference layer 11 may be the first liquid crystal layer itself or a laminate of the first liquid crystal layer and the first alignment layer. When the 1st phase difference layer 11 contains a 1st alignment layer, the 1st alignment layer may be provided in the optical layer 30 side of a 1st liquid crystal layer, and the 2nd bonding layer 22 of a 1st liquid crystal layer. ) may be provided on the side.

The thickness t of the first retardation layer 11 may be, for example, 0.01 µm or more, 0.05 µm or more, 0.1 µm or more, 0.5 µm or more, or 1 µm or more. It is preferable that the thickness t is 5 micrometers or less, 4 micrometers or less may be sufficient, and 3 micrometers or less may be sufficient as it.

The 2nd bonding layer 22 is a layer for bonding the 1st retardation layer 11 and the 2nd retardation layer 12, and is in direct contact with the 1st retardation layer 11 and the 2nd retardation layer 12. can The 2nd bonding layer 22 is an adhesive layer or an adhesive bond hardened layer, and it is preferable that it is an adhesive bond hardened layer.

The elastic modulus G'2 in the temperature of 25 degreeC of the 2nd bonding layer 22 may be 50 kPa or more, for example, may be 50 kPa or more, 70 kPa or more may be sufficient, 90 kPa or more may be sufficient, 100 kPa or more may be sufficient, and 300 kPa or more may be sufficient. good, and 500 kPa or more may be sufficient. The elastic modulus G'2 may be, for example, 5 × 10 ⁶ kPa or less, 4 × 10 ⁶ kPa or less, 3 × 10 ⁶ kPa or less, 2.5 × 10 ⁶ kPa or less, and 1 × 10 ⁵ kPa or less. or less, may be 1 × 10 ⁴ kPa or less, may be 5 × 10 ³ kPa or less, may be 3 × 10 ³ kPa or less, may be 2 × 10 ³ kPa or less, may be 1 × 10 ³ kPa or less, may be 1 × 10 3 kPa or less, 800 It may be less than kPa. The elastic modulus G'2 can be measured according to the method described in the Example mentioned later.

When the 2nd bonding layer 22 is an adhesive layer, 50 kPa or more may be sufficient as said elastic modulus G'2, for example, 70 kPa or more may be sufficient, 90 kPa or more may be sufficient, and 5*10 ³ kPa or less may be sufficient. 3 × 10 ³ kPa or less may be sufficient, 2 × 10 ³ kPa or less may be sufficient, 1 × 10 ³ kPa or less may be sufficient, and 800 kPa or less may be sufficient. When the second bonding layer 22 is an adhesive cured layer, the elastic modulus G'2 may be, for example, 8 × 10 ⁵ kPa or more, 1 × 10 ⁶ kPa or more, and 5 × 10 ⁶ kPa or less, for example. may be, 3 × 10 ⁶ kPa or less may be sufficient, and 1 × 10 ⁵ kPa or less may be sufficient.

When the 2nd bonding layer 22 is an adhesive layer, the thickness d2 of the 2nd bonding layer 22 may be 1 micrometer or more, for example, may be 1 micrometer or more, 5 micrometers or more may be sufficient, 10 micrometers or more may be sufficient, and 15 micrometers or more Also, for example, 50 µm or less may be sufficient, 40 µm or less may be sufficient, 30 µm or less may be sufficient, and 25 µm or less may be sufficient. When the 2nd bonding layer 22 is an adhesive bond hardening layer, thickness d2 of the 2nd bonding layer 22 may be 0.01 micrometer or more, for example, 0.1 micrometer or more may be sufficient, 0.5 micrometer or more may be sufficient, and 1 micrometer or more It may be, and for example, 20 micrometers or less may be sufficient, 15 micrometers or less may be sufficient, 10 micrometers or less may be sufficient, and 5 micrometers or less may be sufficient.

The second phase difference layer 12 may be a stretched film obtained by stretching a resin film, or may include a second liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound. When the second retardation layer 12 includes the second liquid crystal layer, the second retardation layer 12 may be the second liquid crystal layer itself, or a laminate of the second liquid crystal layer and the second alignment layer. When the 2nd phase difference layer 12 contains a 2nd alignment layer, a 2nd alignment layer is normally provided in the opposite side to the 2nd bonding layer 22 side of a 2nd liquid crystal layer.

The thickness of the second retardation layer 12 may be, for example, 0.01 µm or more, 5 µm or more, or 20 µm or less, or 15 µm or less. When the second retardation layer 12 includes the second liquid crystal layer, the thickness of the second retardation layer may be, for example, 0.01 µm or more, 0.05 µm or more, 0.1 µm or more, or 0.5 µm or more. It may be 1 micrometer or more, and may be 5 micrometers or less, 4 micrometers or less may be sufficient, and 3 micrometers or less may be sufficient as it.

The circularly polarizing plate is knitted into a flexible display or the like, and the optical layer 30 side may be bent so as to be inside. In this case, for example, as shown in FIG. 2 , a wave may be generated in the first phase difference layer 11 . Waves generated in the first retardation layer 11 may cause the retardation characteristics of the first retardation layer 11 to be non-uniform when the circularly polarizing plate is observed. Therefore, for example, on the optical layer 30 side of the circularly polarizing plate 1, compared with the case where the circularly polarizing plate 1 is observed from the front, when the circularly polarizing plate 1 is observed from the diagonal direction It is thought that the phenomenon that the hue (color taste) of reflected light differs arises.

In the circularly polarizing plate 1 of this embodiment, the relationship of Formula (1) described in said <i>, and/or the relationship of Formula (2) described in said <ii> is satisfied. Therefore, after bending the circularly polarizing plate 1 so that the optical layer 30 side is inside, even when the bending state is returned to a flat state, it is thought that the wave generated in the first retardation layer 11 is suppressed. do. Thereby, it is thought that it can suppress that the color of reflected light differs according to the observation direction as mentioned above.

In the circularly polarizing plate 1 which satisfies the relationship of Formula (1), the reason that the said wave|wave of the 1st retardation layer 11 can be suppressed is estimated as follows. When the circularly polarizing plate 1 is bent so that the optical layer 30 side may become inside, when the 1st bonding layer 21 is compressed, the 1st bonding layer 21 is going to expand toward the 1st retardation layer 11. . When the 1st bonding layer 21 expands, the 1st phase difference layer 11 arrange|positioned adjacent to the 1st bonding layer 21 is affected and deformed, and the circularly polarizing plate 1 is returned to the state before bending, The first phase difference layer 11 in FIG. 11 does not return to the state before bending, and it is considered that the above-described wave is generated.

In the 1st bonding layer 21 and the 2nd bonding layer 22, it becomes easy to expand, so that elastic modulus G'1 and G'2 are large, and there exists a tendency for it to become hard easily. Then, by making elastic modulus G'1 of the 1st bonding layer 21 relatively small (for example, G'1<G'2), the 1st bonding layer 21 by bending|flexion of the circularly polarizing plate 1 Strain to expand is suppressed, and it becomes easy to suppress the deformation|transformation of the 1st phase difference layer 11 accompanying expansion|swelling of the 1st bonding layer 21. Moreover, by making elastic modulus G'2 of the 2nd bonding layer 22 relatively large (for example, G'1<G'2), the 2nd bonding layer 22 is hardened, and the circularly polarizing plate 1 It becomes easy to suppress that the 1st phase difference layer 11 deform|transforms with expansion|swelling of the 1st bonding layer 21 accompanying a bending|flexion.

On the other hand, in the 1st bonding layer 21 and the 2nd bonding layer 22, stress relaxation property becomes high, so that thickness d1 and d2 are large, ie, the value of the reciprocal of thickness d1 and d2 is small. Then, by making the thickness d1 of the 1st bonding layer 21 relatively large (for example, d1 > d2) and making the value of the reciprocal of the thickness d1 relatively small, with the bending|flexion of the circularly-polarizing plate 1 1st The stress which the bonding layer 21 receives is relieved quickly, and it becomes easy to reduce the stress transmitted to the 1st phase difference layer 11. Moreover, the stress which the 2nd bonding layer 22 receives is relieved by making thickness d2 of the 2nd bonding layer 22 relatively small (for example, d1 > d2) and making the value of the reciprocal of thickness d2 relatively large. It becomes easy to suppress that it makes it difficult to make it and the 1st phase difference layer 11 deform|transforms by the expansion|swelling of the 1st bonding layer 21 accompanying the bending|flexion of the circularly polarizing plate 1.

Thus, by adjusting elastic modulus G'1 and G'2 of the 1st bonding layer 21 and the 2nd bonding layer 22, and thickness d1 and d2 so that the relationship of Formula (1) may be satisfied, the optical layer ( When the circularly polarizing plate 1 is bent so that the 30) side becomes inside, it is thought that it can suppress that the 1st retardation layer 11 deform|transforms, and can suppress generation|occurrence|production of said wave.

When the circularly polarizing plate 1 satisfy|fills the relationship of Formula (2) as described in said <ii>, in the circularly polarizing plate 1 after a bending test, the 1st bonding layer 21 side of the 1st retardation layer 11 It is thought that the wave on the surface of is in a suppressed state. Accordingly, on the optical layer 30 side of the circularly polarizing plate 1, compared with the case of observing the circularly polarizing plate 1 from the front, the color of the reflected light when the circularly polarizing plate 1 is observed from the diagonal direction ( color taste) can suppress other things.

ΔS in Formula (2) is the cross section of the bending part of the circularly polarizing plate 1 after a bending test, as shown in FIG. 2, in the surface by the 1st bonding layer 21 side of the 1st retardation layer 11 It is the distance in the thickness direction between the position closest to the optical layer 30 side and the position furthest from the optical layer 30 side. The thickness direction is a direction orthogonal to the plane of the circularly polarizing plate 1 (stacking direction of the circularly polarizing plate 1). The cross section of the bending portion is a cross section parallel to the direction orthogonal to the rotational axis (oscillation axis) in the bending test in the plane of the circularly polarizing plate 1 before bending, and in detail, the bending test in the Examples described later It is a cross-section parallel to the paper surface in Fig. 4 (a) explaining the. A bending part is the range of the clearance gap C1 (FIG.4(a)) between two stages of the bending|flexion test of the Example mentioned later.

The magnitude of ΔS corresponds to the magnitude of the wave of the first retardation layer 11 described above, and it is considered that the wave is suppressed as ΔS is smaller. In the circularly polarizing plate 1, it is thought that the wave|undulation of the 1st phase difference layer 11 is suppressed. ΔS can be determined based on a microscope image obtained by observing the bent portion of the circularly polarizing plate 1 after the bending test with a scanning electron microscope, as described in Examples to be described later.

In formula (2), ΔS may be, for example, 1.9 t or less, 1.8 t or less, 1.5 t or less, 1.4 t or less, 1.35 t or less, and 1.3 t or less, for example. ΔS may be, for example, 0.1 t or more, 0.5 t or more, t or more, or may exceed t.

In the circularly polarizing plate 1, the first retardation layer 11 and the second retardation layer 12 have the following [a] or [b]:

[a] The first retardation layer 11 is a 1/2 wave plate, and the second retardation layer 12 is a 1/4 wave plate,

[b] One of the first retardation layer 11 and the second retardation layer 12 is a 1/4 wave plate having reverse wavelength dispersion, and the other is a positive C plate,

It is desirable to satisfy the relationship of In the case of the above [b], it is preferable that the first retardation layer 11 is a 1/4 wave plate having reverse wavelength dispersion, and the second retardation layer 12 is a positive C plate.

It is preferable that the circularly polarizing plate 1 is bendable. Being bendable means that it can be bent without generating a crack in the layers constituting the circularly polarizing plate 1 (for example, the first retardation layer 11 or the like). It is preferable that the circularly polarizing plate 1 is bendable in the direction which did the optical layer 30 side inward.

The thickness of the circularly polarizing plate 1 is 5 micrometers or more normally, 10 micrometers or more may be sufficient, 15 micrometers or more may be sufficient, Moreover, it is preferable that it is 80 micrometers or less, and it is more preferable that it is 60 micrometers or less.

(optical laminate)

3 : is a schematic sectional drawing which shows typically an example of the optical laminated body of this embodiment. As shown in FIG. 3, the optical laminated body 5 is the circular polarizing plate 1 and the front plate laminated|stacked on the optical layer 30 side of the circularly polarizing plate 1 via the 3rd bonding layer 23. (40). It is preferable that the optical laminated body 5 is bendable in the direction used as the circularly polarizing plate 1 side inside.

The front plate 40 is a plate-shaped body that can function as a layer for protecting a display element of a display device and the like and can transmit light. In order to make the optical laminated body 5 bendable, it is preferable that a plate-shaped object has a resin film or a glass film. A laminate of a resin film and a glass film may be sufficient as a plate-shaped object. The front plate 40 may be disposed on the outermost surface of the display device.

The 3rd bonding layer 23 may be in direct contact with the optical layer 30 of the front plate 40 and the circularly polarizing plate 1 . The 3rd bonding layer 23 is an adhesive layer or an adhesive bond hardened layer.

The optical laminate 5 may have a 4th bonding layer for bonding together the display element of the display apparatus mentioned later, etc. to the circularly polarizing plate 1 side (2nd phase difference layer side). A 4th bonding layer is an adhesive layer or an adhesive bond hardening layer.

The optical laminate 5 may include a touch sensor panel or the like. The touch sensor panel may be arrange|positioned between the front plate 40 and the circularly polarizing plate 1, and may be arrange|positioned at the circularly polarizing plate 1 side (2nd retardation layer side) of the optical laminated body 5.

(display device)

The optical laminate 5 can be knitted into a display device such as an organic EL display device. A display device can be obtained by laminating|stacking the optical laminated body 5 on the display laminated body containing a display element etc., for example. The display laminated body may contain the touch sensor panel etc. other than a display element.

The display device may be a mobile terminal such as a smartphone or tablet, and may be a television, a digital photo frame, an electronic signage, a measuring instrument or instrument, an office device, a medical device, a computer device, or the like. The display device is preferably a flexible display.

Hereinafter, each layer of a circularly polarizing plate and an optical laminated body is demonstrated in detail.

(optical layer)

The optical layer includes at least a linear polarization layer. The optical layer, in addition to the linear polarizing layer, may have a protective layer for protecting one or both sides of the linear polarizing layer, a reflective film, a transflective reflective film, a luminance enhancing film, an optical compensation film, a film with an anti-glare function, etc. do.

(linear polarization layer)

The linearly polarized light layer has a function of selectively transmitting linearly polarized light in any one direction from non-polarized light rays such as natural light. The linearly polarized light layer contains a stretched film to which a dichroic dye is adsorbed, a cured product of a polymerizable liquid crystal compound, and a dichroic dye, and the dichroic dye is dispersed in the cured product of the polymerizable liquid crystal compound and is oriented. layers, and the like. The dichroic dye refers to a dye having a property in which the absorbance in the long-axis direction and the absorbance in the short-axis direction of the molecule are different from each other.

(Linear polarization layer using stretched film)

The stretched film to which the dichroic dye is adsorbed is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, dyeing the polyvinyl alcohol-based resin film with a dichroic dye such as iodine, a step of adsorbing the dichroic dye , a step of treating the polyvinyl alcohol-based resin film to which the dichroic dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after treatment with an aqueous boric acid solution. The stretched film to which the dichroic dye is adsorbed is obtained by applying a coating liquid containing a polyvinyl alcohol-based resin on a base film to obtain a laminated film, uniaxially stretching the obtained laminated film, polyvinyl of the uniaxially stretched laminated film It may be manufactured through a step of adsorbing the dichroic dye to the alcohol-based resin layer, a step of treating the polyvinyl alcohol-based resin layer to which the dichroic dye has been adsorbed with an aqueous boric acid solution, and a step of washing with water after treatment with an aqueous boric acid solution. The obtained film may be used as a linear polarizing layer as it is, and may be used as a linear polarizing plate in which a protective layer is formed on one or both surfaces of the film. The thickness of the linearly polarizing layer obtained in this way becomes like this. Preferably it is 2 micrometers - 40 micrometers.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. As polyvinyl acetate-type resin, the copolymer of vinyl acetate and other monomer copolymerizable to it other than polyvinyl acetate which is a homopolymer of vinyl acetate is used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.

The saponification degree of polyvinyl alcohol-type resin is about 85-100 mol% normally, Preferably it is 98 mol% or more. The polyvinyl alcohol-type resin may be modified|denatured, for example, polyvinyl formal and polyvinyl acetal modified|denatured with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is about 1,000-10,000 normally, Preferably it is the range of 1,500-5,000.

What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of the linearly polarizing layer. The method for forming a polyvinyl alcohol-type resin into a film is not specifically limited, A film can be formed by a well-known method. The film thickness of the polyvinyl alcohol-based raw film can be, for example, about 10 µm to 150 µm.

Uniaxial stretching of a polyvinyl alcohol-type resin film can be performed before dyeing with a dichroic dye, simultaneously with dyeing, or after dyeing. When performing uniaxial stretching after dyeing|staining, this uniaxial stretching may be performed before a boric-acid process, and may be performed during a boric-acid process. Moreover, it is also possible to perform uniaxial stretching in these several steps. In uniaxial stretching, you may stretch uniaxially between rolls from which circumferential speeds differ from each other, and you may extend|stretch uniaxially using a hot roll. In addition, uniaxial stretching may be dry extending|stretching extending|stretching in air|atmosphere, and wet extending|stretching which extends|stretches in the state which made the polyvinyl alcohol-type resin film swell using a solvent may be sufficient as it. The draw ratio is usually about 3 to 8 times.

A stretched film is used as a linearly polarizing layer, and the thickness of a linearly polarizing plate having a protective layer on one or both surfaces thereof may be, for example, 1 µm or more and 100 µm or less, 5 µm or more, 7 µm or more, and , 70 µm or less may be sufficient, 50 µm or less may be sufficient, 20 µm or less may be sufficient, and 10 µm or less may be sufficient.

Although it does not specifically limit as a material of the protective layer provided on one side or both surfaces of a linearly polarizing layer, For example, Cellulose acetate type resin which consists of resin, such as a cyclic polyolefin type resin, triacetyl cellulose (TAC), and diacetyl cellulose. Polyester-based resins made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycarbonate-based resins, (meth)acrylic resins, polypropylene-based resins, and the like, resins known in the art can be mentioned. have. The thickness of the protective layer is usually 300 µm or less, preferably 200 µm or less, more preferably 100 µm or less, and usually 5 µm or more, and preferably 20 µm or more from the viewpoint of reducing the thickness. A film may be sufficient as a protective layer, and the protective layer which is a film may have retardation. When a protective layer is a film, a linearly polarizing layer and a protective layer can be laminated|stacked through an adhesive layer or an adhesive agent hardening layer. The pressure-sensitive adhesive layer or the cured adhesive layer can be formed using the pressure-sensitive adhesive composition or adhesive composition described later.

(Linear polarization layer using liquid crystal layer)

The polymerizable liquid crystal compound used to form the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. A polymerizable reactive group is a group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable reactive group. The photopolymerization reactive group refers to a group capable of participating in a polymerization reaction by an active radical or an acid generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. . Among these, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable. The kind of polymerizable liquid crystal compound is not specifically limited, A rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and these mixtures can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and a nematic liquid crystal or a smectic liquid crystal may be sufficient as a normal-order structure.

As a dichroic dye used for the linearly polarizing layer using a liquid crystal layer, it is preferable to have an absorption maximum wavelength (λMAX) in the range of 300-700 nm. As such a dichroic dye, although an acridine dye, an oxazine dye, a cyanine dye, a naphthalene dye, an azo dye, an anthraquinone dye, etc. are mentioned, for example, Especially, an azo dye is preferable. As an azo dye, a monoazo dye, a bisazo dye, a trisazo dye, a tetrakis azo dye, a stilbenazo dye, etc. are mentioned, Preferably they are a bisazo dye and a trisazo dye. Although a dichroic dye may be individual or may combine 2 or more types, it is preferable to combine 3 or more types. In particular, it is more preferable to combine three or more types of azo compounds. A part of the dichroic dye may have a reactive group, and may have liquid crystallinity.

The linear polarization layer using the liquid crystal layer is cured by, for example, applying a composition for forming a polarization layer including a polymerizable liquid crystal compound and a dichroic dye on an alignment layer formed on a substrate, and polymerizing the polymerizable liquid crystal compound It can be formed by Or you may form a linearly polarizing layer by apply|coating the composition for polarizing layer formation on a base material, forming a coating film, and extending|stretching this coating film together with a base material layer. You may use the base material used in order to form a linearly polarizing layer as a protective layer of a linearly polarizing layer. As a base material, a resin film is mentioned, For example, the film shape|molded using the material which comprises said protective layer is mentioned.

As a composition for forming a polarizing layer comprising a polymerizable liquid crystal compound and a dichroic dye, and a method for manufacturing a linearly polarizing layer using the composition, Japanese Patent Laid-Open Nos. 2013-37353, 2013-33249, and Japanese Patents What was described in Unexamined-Japanese-Patent No. 2017-83843 etc. can be illustrated. The composition for polarizing layer formation may further contain additives, such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, antioxidant, a plasticizer, and a sensitizer, in addition to a polymeric liquid crystal compound and a dichroic dye. These components may use only 1 type, respectively, and may use them in combination of 2 or more type.

The polymerization initiator which the composition for polarizing layer formation may contain is a compound which can initiate the polymerization reaction of a polymeric liquid crystal compound, and a photoinitiator is preferable at the point which can start a polymerization reaction under lower temperature conditions. . Specifically, a photoinitiator capable of generating an active radical or an acid by the action of light is exemplified, and among these, a photoinitiator capable of generating a radical by the action of light is preferable.

To [ content of a polymerization initiator / 100 mass parts of total amounts of a polymeric liquid crystal compound ], Preferably they are 1 mass part - 10 mass parts, More preferably, they are 3 mass parts - 8 mass parts. If it exists in this range, reaction of a polymeric group will fully advance and it will be easy to stabilize the orientation state of a liquid crystal compound.

Although the thickness of the linearly polarizing layer using a liquid crystal layer is not specifically limited, It is preferable that it is 20 micrometers or less, It is more preferable that it is 10 micrometers or less, It is more preferable that it is 5 micrometers or less.

The linearly polarizing layer using the liquid crystal layer may have an overcoat layer as a protective layer on one side or both surfaces of the linearly polarizing layer. An overcoat layer can be provided for the purpose of protection of a linearly polarizing layer, etc. It is preferable that the overcoat layer is excellent in solvent resistance, transparency, mechanical strength, thermal stability, shielding property, isotropy, and the like. The overcoat layer can be formed, for example, by applying a material (composition) for forming an overcoat layer on the linearly polarizing layer. As a material constituting the overcoat layer, for example, a photocurable resin or a water-soluble polymer can be mentioned, and a (meth)acrylic resin, a polyvinyl alcohol-based resin, a polyamide epoxy resin, and the like can be used.

The thickness of the overcoat layer is not particularly limited, but is preferably 20 µm or less, more preferably 15 µm or less, still more preferably 10 µm or less, may be 5 µm or less, and is 0.05 µm or more, and 0.5 µm or more. good night.

(1st retardation layer, 2nd retardation layer)

The first retardation layer includes a first liquid crystal layer that is a layer of a cured product of a polymerizable liquid crystal compound. As a polymerizable liquid crystal compound, what was demonstrated above can be used, for example. When the second retardation layer includes a second liquid crystal layer that is a layer of a cured product of a polymerizable liquid crystal compound, the polymerizable liquid crystal compound may be, for example, the one described above. The polymerizable liquid crystal compound forming the linearly polarizing layer, the polymerizable liquid crystal compound forming the first retardation layer, and the polymerizable liquid crystal compound forming the second retardation layer may be the same, only a part may be the same, or all may be different. .

When a 2nd retardation layer is the stretched film which extended|stretched the resin film, the resin film illustrated by the above-mentioned protective layer is mentioned as a resin film.

The first retardation layer and the second retardation layer (hereinafter, collectively referred to as "retardation layer") are formed by, for example, applying a composition for forming a retardation layer comprising a polymerizable liquid crystal compound on a base layer, , can be formed by polymerizing and curing a polymerizable liquid crystal compound. The base material layer used in order to form retardation layer may be contained in the circularly polarizing plate. As a base material layer, the resin film demonstrated by the above-mentioned protective layer can be used, for example.

The first phase difference layer may be a laminate of the first liquid crystal layer and the first alignment layer as described above.

When the second retardation layer contains the second liquid crystal layer, the second retardation layer may be a laminate of the second liquid crystal layer and the second alignment layer as described above.

(first alignment layer, second alignment layer)

The 1st alignment layer and the 2nd alignment layer (Hereinafter, both may be referred to collectively as "alignment layer") has the orientation regulating force which carries out the liquid-crystal orientation of a polymeric liquid crystal compound in a desired direction. Examples of the alignment layer include an alignment polymer layer formed of an alignment polymer, a photo alignment polymer layer formed of a photo alignment polymer, and a groove alignment layer having an uneven pattern or a plurality of grooves on the surface of the layer. The thickness of an orientation layer is 10-500 nm normally, and it is preferable that it is 10-200 nm.

(1st bonding layer, 2nd bonding layer, 3rd bonding layer, 4th bonding layer)

The 1st - 4th bonding layer is an adhesive layer or an adhesive bond hardening layer. An adhesive layer can be formed using a well-known adhesive composition. An adhesive cured layer can be formed using a well-known adhesive composition.

As an adhesive composition, the adhesive composition which has as a main component resin like (meth)acrylic type, rubber type, urethane type, ester type, silicone type, and polyvinyl ether type is mentioned. Especially, the adhesive composition which uses (meth)acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. as a base polymer is preferable. An active energy ray hardening type or a thermosetting type may be sufficient as an adhesive composition.

As the (meth)acrylic resin (base polymer) used in the pressure-sensitive adhesive composition, for example, (meth) butyl acrylate, (meth) ethyl acrylate, (meth) acrylate isooctyl, (meth) acrylate 2-ethylhexyl ( The polymer or copolymer which uses 1 type(s) or 2 or more types of meth)acrylic acid ester as a monomer is used preferably. It is preferable to copolymerize a polar monomer with a base polymer. Examples of the polar monomer include (meth)acrylic acid, (meth)acrylic acid 2-hydroxypropyl, (meth)acrylic acid hydroxyethyl, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, The monomer which has a carboxy group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc. like glycidyl (meth)acrylate is mentioned.

Although the adhesive composition may contain only the said base polymer, normally, it further contains a crosslinking agent. Examples of the crosslinking agent include those that form a metal carboxylate salt between a carboxyl group and a divalent or higher metal ion; A polyamine compound that forms an amide bond with a carboxy group; A polyepoxy compound or polyol that forms an ester bond with a carboxy group; As the polyisocyanate compound, those that form an amide bond with a carboxy group are exemplified. Especially, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays or electron beams, has adhesiveness even before irradiation with active energy rays, and can adhere to an adherend such as a film, and is irradiated with active energy rays It is a pressure-sensitive adhesive composition having a property that can be cured by the adhesion can be adjusted. It is preferable that an active energy ray hardening-type adhesive composition is an ultraviolet curable type. In addition to a base polymer and a crosslinking agent, an active energy ray hardening-type adhesive composition contains an active energy ray polymeric compound further. As needed, a photoinitiator, a photosensitizer, etc. may be made to contain further.

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders and other inorganic powders, etc.), antioxidants, ultraviolet rays It may contain additives such as absorbents, dyes, pigments, colorants, defoamers, corrosion inhibitors, and photopolymerization initiators.

An adhesive layer can be formed by apply|coating the organic solvent dilution liquid of the said adhesive composition on a base material, and drying it. When an active energy ray hardening-type adhesive composition is used, it can be set as the hardened|cured material which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

Examples of the adhesive composition include water-based adhesives, active energy ray-curable adhesives, natural rubber adhesives, α-olefin adhesives, urethane resin adhesives, ethylene-vinyl acetate resin emulsion adhesives, ethylene-vinyl acetate resin hot melt adhesives, and epoxy resin adhesives. , Vinyl chloride resin solvent adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, silicone adhesive, styrene-butadiene rubber solvent adhesive, nitrile rubber adhesive, nitrocellulose adhesive, reactive hot melt adhesive, phenol resin adhesive, modified silicone adhesive , polyester hot melt adhesive, polyamide resin hot melt adhesive, polyimide resin adhesive, polyurethane resin hot melt adhesive, polyolefin resin hot melt adhesive, polyvinyl acetate resin solvent adhesive, polystyrene resin solvent adhesive, polyvinyl alcohol adhesive, poly and vinylpyrrolidone resin adhesives, polyvinyl butyral adhesives, polybenzimidazole adhesives, polymethacrylate resin solvent adhesives, melamine resin adhesives, urea resin adhesives, resorcinol adhesives, and the like. These adhesives can be used individually by 1 type or in mixture of 2 or more types.

Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution, a water-based two-part type urethane-based emulsion adhesive, and the like. The active energy ray-curable adhesive is an adhesive that is cured by irradiating active energy rays such as ultraviolet rays, for example, a polymerizable compound and a photopolymerizable initiator, a photoreactive resin, a binder resin, and a photoreactive crosslinking agent and those containing As said polymeric compound, photopolymerizable monomers, such as a photocurable epoxy type monomer, a photocurable (meth)acrylic type monomer, and a photocurable urethane type monomer, the oligomer derived from these monomers, etc. are mentioned. As said photoinitiator, the thing containing the substance which irradiates active energy rays, such as an ultraviolet-ray, and generate|occur|produces active species, such as a neutral radical, an anion radical, and a cationic radical, is mentioned.

(front panel)

The material and thickness are not limited as long as a front plate is a plate-shaped body which can transmit light. The front plate may be comprised only by one layer, and may be comprised by two or more layers. As a front plate, resin plate-shaped objects (for example, a resin plate, a resin sheet, a resin film, etc.) and glass plate-shaped objects (for example, a glass plate, a glass film, etc.) are mentioned. The front plate may constitute the outermost surface of the display device. Moreover, the resin film with a hard-coat layer which provided a hard-coat layer in the at least one surface of a resin film or a resin film and improved hardness more may be sufficient as a front plate. When using a resin film with a hard-coat layer, it is preferable to provide so that a hard-coat layer may be arrange|positioned on the outermost surface of a display device. Moreover, the front plate may have a blue light cut function, a viewing angle adjustment function, etc.

When a front plate contains a resin film, it is preferable that the 3rd bonding layer in an optical laminated body contacts a resin film, and is provided. For example, when a front plate contains the resin film with a hard-coat layer which has a hard-coat layer on one surface of a resin film, it is preferable that the 3rd bonding layer in an optical laminated body is provided in contact with the resin film of a front plate. do.

As a resin film which comprises a front plate, if it is a resin film which can transmit light, it will not be limited. For example, triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly(meth)acryl , polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyether ketone, polyether ether ketone, polyether sulfone, and films formed of polymers such as polymethyl (meth)acrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymer|macromolecule can be used individually or in mixture of 2 or more types. When the display device is a flexible display, a resin film formed of a polymer such as polyimide, polyamide, or polyamideimide, which has excellent flexibility, can be configured to have high strength and high transparency, is preferably used.

The front plate may be a resin film provided with a hard-coat layer from a viewpoint of hardness. The hard-coat layer may be formed in one side of a resin film, and may be formed in both surfaces. By providing a hard-coat layer, hardness and scratch resistance can be improved. A hard-coat layer is a hardened layer of ultraviolet curable resin, for example. As ultraviolet curable resin, For example, Monofunctional (meth)acrylic-type resin, polyfunctional (meth)acrylic-type resin, (meth)acrylic-type resin, such as (meth)acrylic-type resin, such as polyfunctional (meth)acrylic-type resin which has a dendrimer structure; silicone-based resin; polyester-based resin; urethane-based resin; amide-based resins; Epoxy resin etc. are mentioned. The hard-coat layer may contain the additive in order to improve intensity|strength. The additive is not particularly limited, and examples thereof include inorganic fine particles, organic fine particles, and mixtures thereof. When it has a hard-coat layer on both surfaces of a resin film, the composition and thickness of each hard-coat layer may mutually be mutually same, and may differ from each other.

When a front plate is a glass plate, as for a glass plate, the tempered glass for a display is used preferably. By using a glass plate, the front plate which has the outstanding mechanical strength and surface hardness can be comprised.

The thickness of the front plate may be, for example, 10 µm or more and 300 µm or less, preferably 20 µm or more and 200 µm or less, and more preferably 30 µm or more and 100 µm or less.

(touch sensor panel)

The touch sensor panel is a sensor capable of detecting a touched position. The detection method of the touch sensor panel is not limited, and touch sensor panels such as a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic method, an electromagnetic inductive coupling method, and a surface acoustic wave method are exemplified. A film type or capacitive coupling type touch sensor panel is preferably used.

Example

Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited by these examples. Unless otherwise specified, "%" and "part" in an Example and a comparative example are mass % and mass part.

[Measurement of thickness]

The thickness of the linearly polarizing layer, each alignment layer, and each retardation layer was measured using a laser microscope (manufactured by Olympus Corporation, OLS3000). The thicknesses other than the above were measured using a contact-type film thickness measuring apparatus (manufactured by Nikon Corporation, MS-5C).

[Measurement of modulus of elasticity]

(Measurement of the elastic modulus of the pressure-sensitive adhesive layer)

The elastic modulus in the temperature of 25 degreeC in the case of a 1st bonding layer and a 2nd bonding layer being an adhesive layer was performed with the following procedure. After cutting the adhesive sheet provided with the adhesive layer used as a 1st bonding layer or a 2nd bonding layer to 30 mm in width x 30 mm in length, the light separator film (light SP film) is peeled off, and thickness is 150 micrometers A plurality of pressure-sensitive adhesive layers were laminated so as to become The laminated adhesive layer was bonded to the glass plate. Using a viscoelasticity measuring device (Anton Paar, MCR-301), in a state in which the laminated adhesive layer and the measuring chip are bonded, in a temperature range of -20°C to 100°C, a frequency of 1.0 Hz, a deformation amount of 1%, a temperature increase rate of 5 It measured on the conditions of °C/min, and the storage elastic modulus in a temperature of 25 degreeC and 50% of a relative humidity was determined as an elasticity modulus.

(Measurement of elastic modulus of adhesive cured layer)

The elastic modulus in the temperature of 25 degreeC in the case of a 1st bonding layer and a 2nd bonding layer being an adhesive agent hardening layer performed with the following procedure. The COP film (the Zeon Corporation make, 50 micrometers in thickness) was laminated|stacked on the coating film obtained by coating the adhesive composition for forming the adhesive agent hardening layer used as a 1st bonding layer or a 2nd bonding layer to glass (thickness 1.0mm). Then, with respect to the coating film, using an ultraviolet irradiation device (manufactured by Fusion UV Systems Inc., having an H valve of an electrodeless ultraviolet lamp), the light irradiation intensity was 400 mW/cm 2 and the accumulated light quantity at a wavelength of 280 to 320 nm. An ultraviolet-ray was irradiated so that it might become this 1500 mJ/cm<2>, the adhesive composition was hardened, and the laminated structure which has the layer structure of glass/adhesive agent hardened layer (2 micrometers in thickness)/COP film was obtained. After peeling off the COP film from the laminated structure, the exposed adhesive cured layer was measured using a Nano Indenter (HM-500, manufactured by Fisher Instruments) under the conditions of a temperature of 25° C., a relative humidity of 50%, and a pressure of 1 mN. was performed and this was made into the elastic modulus. For the indenter, a Berkovich triangular pendulum indenter was used.

[Evaluation of flexibility]

Polyethylene with a thickness of 100 µm assuming a display laminate of a pressure-sensitive adhesive layer exposed by peeling the heavy separator film (heavy SP film) on the circular polarizing plate side from the optical laminate obtained in each Example and Comparative Example, and a display device After corona-treating (output 0.3 kW, processing speed 3 m/min) on the surface of a terephthalate (PET) film, corona-treated surfaces were bonded together and the test piece 100 was obtained. Using this test piece 100, the bending test was done as follows. 4A and 4B are diagrams schematically showing the method of the bending test. A bending device (manufactured by Science Town, STS-VRT-500) having two stages 501 and 502 was prepared. The test piece 100 was placed on the stages 501 and 502 so that the front plate side was facing up (Fig. 4(a)). The two stages 501 and 502 were arranged with the gap C1, and the test piece 100 was fixed and arranged so that the center of the width direction was located at the center of the gap C1 (FIG. 4(a)).

The stages 501 and 502 are swingable, and initially the two stages 501 and 502 form the same plane. The two stages 501 and 502 are rotated 90 degrees upward with the positions P1 and P2 as the center of the rotation axis, so that the spacing C2 between the opposing test pieces 100 is 5 mm (this In this state, the radius of the curved portion is approximately 2.5R), the two stages 501 and 502 are closed (FIG. 4(b)), and the operation of opening the stages 501 and 502 again is performed once. Define curvature. This operation was repeated, and the number of bendings until cracks first occurred in the test piece 100 was counted to evaluate the flexibility. The evaluation criteria are as follows.

A: The number of bendings until cracking is 300,000 or more

B: The number of bendings until cracking is 200,000 or more and less than 300,000

C: The number of bendings until cracking is 100,000 or more but less than 200,000

D: The number of bendings until cracking is 50,000 or more and less than 100,000

[Measurement of ΔS]

From the optical laminates obtained in each Example and Comparative Example, a test piece 100 was prepared by the above-described evaluation procedure for flexibility, and 200,000 bending operations were performed for this test piece 100 by the above-described evaluation procedure for flexibility. A bending test to be performed was performed. The cross section of the bent part of the circularly polarizing plate in the test piece 100 after a bending test (range of the gap|interval C1 of the above-mentioned two stages) was observed with the scanning electron microscope. The cross section of the bent portion was a cross section in a direction parallel to the direction orthogonal to the rotation axis (oscillation axis) in the bending test on the plane of the circularly polarizing plate before bending (a cross section parallel to the paper in Fig. 4(a)). . The microscope image of the cross section of the test piece after a bending test WHEREIN: With respect to the bending part of a circularly polarizing plate, the position closest to the optical layer (polarizing plate) side among the surfaces on the side of the 1st bonding layer of a 1st retardation layer, and the optical layer (polarizing plate) side The distance in the thickness (stacking) direction (direction orthogonal to the plane of the circular polarizing plate) of the circularly polarizing plate between the farthest positions was measured as (DELTA)S.

[Visual evaluation]

The test piece 100 (which has been subjected to 200,000 bending operations) subjected to the bending test by the procedure for measuring ΔS described above is taken as the state before bending (the flat state shown in Fig. 4(a)), and the test piece 100 In the front plate side, the hue (color taste) of the reflected light when observed from the front, and the diagonal direction of the angle of 40° with respect to the plane of the test piece 100 (the direction of the angle of 50° when the direction of the front is 0°) The hue (color taste) of the reflected light when observed with the naked eye was visually confirmed and evaluated by contrast.

a: As a result of the contrast, no difference in the color of the reflected light was observed.

b: As a result of the contrast, a slight difference was seen in the color of the reflected light.

c: As a result of the contrast, a difference was seen in the color of the reflected light.

d: A crack occurred in the first retardation layer.

Materials used in each Example and Comparative Example were prepared by the following procedure.

[Preparation of the polarizing plate (1)]

(Preparation of a composition for forming a protective layer)

A composition for forming a protective layer for forming an overcoat (OC) layer as a protective layer, 100 parts of water, 3 parts of polyvinyl alcohol resin powder (KL-318, manufactured by KURARAY CO., LTD., average degree of polymerization 18000), a crosslinking agent It was prepared by mixing 1.5 parts of polyamide epoxy resin (SR650 (30), Sumika Chemtex Company, Limited make) as a.

(Production of polarizing plate 1)

The composition for forming an orientation layer was apply|coated to the 25-micrometer-thick triacetyl cellulose (TAC) film as a protective layer, and the coating film was formed. Polarized UV was irradiated to this coating film, and the 100-nm-thick orientation layer (photo-alignment layer) was formed. On the orientation layer (the side opposite to the TAC film side), the composition for polarizing layer formation containing a polymeric liquid crystal compound and an azo dye was apply|coated, and the coating film was formed. After drying this coating film, the ultraviolet-ray was irradiated and the 1.8-micrometer-thick linearly polarizing layer 1 was formed.

On the linear polarizing layer 1 (on the side opposite to the TAC film side), a composition for forming a protective layer is applied and dried, an OC layer having a thickness of 1.0 μm as a protective layer is formed, and a polarizing plate 1 as an optical layer is formed. got it As for the polarizing plate 1, the TAC film, the orientation layer, the linearly polarizing layer 1, and the OC layer were laminated|stacked in this order.

[Preparation of the polarizing plate (2)]

(Preparation of the linear polarization layer 2)

A long polyvinyl alcohol (PVA) raw film with a thickness of 30 µm (average degree of polymerization of 2400, degree of saponification of 99.9 mol% or more) was immersed in a swelling bath made of pure water (swelled) After step), it was immersed in a dyeing bath containing iodine (dyeing step) and immersed in a crosslinking bath containing potassium iodide and boric acid (crosslinking step). In the dyeing process and the crosslinking process, longitudinal axial stretching was performed by extending|stretching between rolls in a bath. The total draw ratio on the basis of the raw film was 5.4 times. Next, the film taken out of the crosslinking bath is immersed in a washing bath made of pure water (washing step), and then introduced into a heating furnace capable of controlling humidity to perform high-temperature, high-humidity treatment (high-temperature, high-humidity treatment step), the thickness A linearly polarizing layer (2) of 12.1 µm was obtained.

(Production of polarizing plate 2)

The 23-micrometer-thick cyclic polyolefin (COP) film as a protective layer, and the linearly polarizing layer 2 were corona-treated (output 0.3 kW, processing speed 3 m/min), respectively. Using the composition for forming a protective layer prepared in the above [Preparation of the polarizing plate 1] as an adhesive composition, the corona-treated surface of the COP film and the corona-treated surface of the linearly polarizing layer 2 are bonded together, and at a temperature of 60° C. 2 It dried for minutes, and obtained the polarizing plate (2) as an optical layer. As for the polarizing plate 2, the COP film and the linearly polarizing layer 2 were laminated|stacked in this order.

[Preparation of the first retardation layer]

(Composition for forming the first alignment layer)

The composition for forming a first alignment layer for forming the first alignment layer was prepared by dissolving a polymer having a photoreactive group represented by the following structural formula in cyclopentanone at a concentration of 5%.

[Tue 1]

(Composition for forming the first liquid crystal layer)

The composition for forming a 1st liquid-crystal layer for forming a 1st liquid-crystal layer was prepared by mixing each component shown below, and stirring the obtained mixture at 80 degreeC for 1 hour.

A compound represented by the following structural formula: 80 parts

[Tue 2]

· A compound represented by the following structural formula: 20 parts

[Tuesday 3]

Polymerization initiator (Irgacure369, 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one, manufactured by BASF): 6 parts

-Leveling agent (BYK-361N, polyacrylate compound, manufactured by BYK-Chemie): 0.1 part

・Solvent (cyclopentanone): 400 parts

(Preparation of the 1st retardation layer with a base material layer)

The composition for forming a 1st orientation layer was apply|coated by the bar coating method on the polyethylene terephthalate film (PET) of thickness 100 micrometers as a base material layer, and it heat-dried for 1 minute in 80 degreeC drying oven. The obtained dry film was subjected to a polarization UV irradiation treatment (“SPOT CURE SP-9”, manufactured by Ushio Inc.) at an accumulated light amount of 100 mJ/cm 2 (based on 365 nm) to form a first alignment layer. The polarization direction of polarization UV was performed so that it might become 45 degrees with respect to the absorption axis of a linear polarization layer.

On the 1st alignment layer (the side opposite to the PET film side), the composition for 1st liquid crystal layer formation was apply|coated by the bar coating method, after heating and drying for 1 minute in 120 degreeC drying oven, it cooled to room temperature. A 2.0-micrometer-thick 1st liquid-crystal layer was formed by irradiating the ultraviolet-ray of 1000 mJ/cm<2> (365 nm standard) of accumulated light quantity to the obtained dry film. The first liquid crystal layer was a λ/4 plate showing a retardation value of λ/4 in the in-plane direction, and had reverse wavelength dispersion. Thereby, PET film and the 1st retardation layer (1st orientation layer, 1st liquid crystal layer) obtained the 1st retardation layer with a base material layer laminated|stacked in this order.

[Preparation of the second retardation layer]

(Composition for forming a second alignment layer)

The composition for forming the second alignment layer for forming the second alignment layer includes 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, dipentaerythritol triacrylate, and bis(2-vinyloxyethyl ) ether was mixed in a ratio of 1:1:4:5 by mass, and LUCIRIN TPO as a polymerization initiator was added to this mixture in a ratio of 4% to prepare it.

(Composition for forming a second liquid crystal layer)

The composition for forming the second liquid crystal layer for forming the second liquid crystal layer was prepared by mixing a photopolymerizable nematic liquid crystal compound (manufactured by Merck, RMM28B) and a solvent so that the solid content was 1-1.5 g. The solvent is a mixed solvent in which methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone (CHN) are mixed in a mass ratio (MEK:MIBK:CHN) in a ratio of 35:30:35. used

(Preparation of 2nd retardation layer with base material layer)

On a polyethylene terephthalate (PET) film having a thickness of 38 µm as a base layer, a composition for forming a second alignment layer is applied so that the thickness becomes 3 µm, and ultraviolet rays of 200 mJ/cm 2 are irradiated to form a second alignment layer as a vertical alignment layer layer was formed.

On the second alignment layer (the side opposite to the PET film side), the composition for forming the second liquid crystal layer was applied by die coating at a coating amount of 4 to 5 g (wet) to form a coating film. After drying the coating film at a drying temperature of 75°C and a drying time of 120 seconds, ultraviolet rays were irradiated to form a 3 µm-thick second liquid crystal layer. The second liquid crystal layer was a positive C plate. Thereby, PET film and the 2nd retardation layer (2nd orientation layer, 2nd liquid crystal layer) obtained the 2nd retardation layer with a base material layer laminated|stacked in this order.

[Preparation of the adhesive layer]

The following pressure-sensitive adhesive compositions A to D were prepared, and pressure-sensitive adhesive layers A to C, D1 and D2 were prepared using this pressure sensitive adhesive.

(Preparation of adhesive composition A and adhesive sheet A)

70 parts of n-butyl acrylate, 20 parts of methyl acrylate, and 1.0 part of acrylic acid were copolymerized, and the acrylic polymer (A) was prepared. When the molecular weight of the acrylic polymer (A) was measured, the weight average molecular weight Mw was 1.5 million.

To 100 parts of acrylic polymer (A), 0.3 parts of a crosslinking agent (Nippon Polyurethane Industry Co., Ltd. "Colonate L"), and a silane coupling agent ("X-12-981" manufactured by Shin-Etsu Chemical Co., Ltd.) 0.5 parts were mixed, ethyl acetate was added so that total solid content concentration might be 10%, and the adhesive composition A was obtained. The obtained pressure-sensitive adhesive composition A was applied to the release-treated surface of a release-treated polyethylene terephthalate film (medium separate film (medium SP film), 38 µm in thickness) so that the thickness after drying was 25 µm using an applicator. The application layer was dried at 100 degreeC for 1 minute, and the adhesive layer A was formed. Then, on the exposed surface of the adhesive layer A, the other polyethylene terephthalate film (light-separate film (light SP film), 38 micrometers in thickness) by which the release process was carried out was pasted together. Thereafter, it was cured for 7 days under conditions of a temperature of 23°C and a relative humidity of 50%RH. Thereby, the adhesive sheet A which consists of heavy SP film/adhesive layer A/light SP film was produced. The elastic modulus in 25 degreeC of the adhesive layer A which adhesive sheet A has was measured. A result is shown in Table 1.

(Preparation of adhesive composition B and adhesive sheet B)

98.9 parts of n-butyl acrylate and 1.1 parts of acrylic acid were copolymerized to prepare an acrylic polymer (B). When the molecular weight of the acrylic polymer (B) was measured, the weight average molecular weight Mw was 1.36 million.

To 100 parts of the acrylic polymer (B), 2 parts of a first crosslinking agent ("Colonate L" by Nippon Polyurethane Industry Co., Ltd.), 0.02 parts of a second crosslinking agent ("TAZM" by Sogo Pharmaceutical Co., Ltd.); 0.5 parts of a silane coupling agent ("KBM403" by Shin-Etsu Chemical Co., Ltd.) was mixed, ethyl acetate was added so that total solid content concentration might be 10%, and the adhesive composition B was obtained. Except having used the adhesive composition B, it was the procedure similar to preparation of the adhesive sheet A, and the adhesive sheet B which consists of heavy SP film/adhesive layer B/light SP film was produced. The elastic modulus in 25 degreeC of the adhesive layer B which adhesive sheet B has was measured. A result is shown in Table 1.

(Preparation of adhesive composition C and adhesive sheet C)

70.4 parts of n-butyl acrylate, 45 parts of 2-ethylhexyl acrylate, and 1 part of 4-hydroxybutyl acrylate were copolymerized to prepare an acrylic polymer (C). When the molecular weight of the acrylic polymer (C) was measured, the weight average molecular weight Mw was 800,000.

In 100 parts of acrylic polymer (C), 0.4 parts of a crosslinking agent (Nippon Polyurethane Industry Co., Ltd. "Colonate L") and 0.5 parts of a silane coupling agent ("KBM403" manufactured by Shin-Etsu Chemical Co., Ltd.) are mixed, , ethyl acetate was added so that total solid content concentration might be 10 %, and the adhesive composition C was obtained. Except having used the adhesive composition C, it was the procedure similar to preparation of the adhesive sheet A, and the adhesive sheet C which consists of heavy SP film/adhesive layer C/light SP film was produced. The elastic modulus in 25 degreeC of the adhesive layer C which adhesive sheet C has was measured. A result is shown in Table 1.

(Preparation of adhesive composition D and adhesive sheets D1 and D2)

68 parts of n-butyl acrylate, 30 parts of methyl acrylate, 1 part of 2-hydroxyethyl acrylate, and 1 part of acrylic acid were copolymerized, and the acrylic polymer (D) was prepared. When the molecular weight of the acrylic polymer (D) was measured, the weight average molecular weight Mw was 1.35 million.

100 parts of acrylic polymer (D), 3 parts of a crosslinking agent (Nippon Polyurethane Industry Co., Ltd. "Colonate L") and 0.5 parts of a silane coupling agent ("KBM403" manufactured by Shin-Etsu Silicone) are mixed, and the total solid content concentration Ethyl acetate was added so that it might become 10 %, and the adhesive composition D was obtained.

Using the pressure-sensitive adhesive composition D, except that the pressure-sensitive adhesive composition D was applied so that the thickness after drying was 15 µm, in the same procedure as in the preparation of the pressure-sensitive adhesive sheet A, the pressure-sensitive adhesive sheet consisting of a medium SP film / adhesive layer D1 / light SP film D1 was made. In addition, except that the pressure-sensitive adhesive composition D was applied using the pressure-sensitive adhesive composition D so that the thickness after drying was set to 5 µm, the same procedure as in the preparation of the pressure-sensitive adhesive sheet A was performed, consisting of a heavy SP film/adhesive layer D2/light SP film. An adhesive sheet D2 was produced. The elastic modulus in 25 degreeC of adhesive layer D1 and D2 which adhesive sheet D1 and D2 have, respectively was measured. A result is shown in Table 1.

[Preparation of adhesive composition]

50 parts of trade name "CEL2021P" (manufactured by Daicel) and 50 parts of trade name "OXT-221" (manufactured by TOAGOSEI CO., LTD.) as a curable component, trade name "CPI-100" (manufactured by San-apro) 2.25 as a photopolymerization initiator 2 parts of 1, 4- diethoxy naphthalene as part and a sensitizer were mixed, and the adhesive composition was produced.

[Preparation of the front panel]

As the front plate, a film with an HC layer in which a hard coat (HC) layer having a thickness of 10 µm was formed on one side of a polyimide (PI)-based resin film having a thickness of 50 µm was used. The HC layer was a layer formed from the composition containing the dendrimer compound which has a polyfunctional acryl group at the terminal.

[Example 1]

(Production of phase difference laminate 1)

Corona treatment (output 0.3 kW, processing speed 3 m/min) was performed on the side of the first retardation layer of the first retardation layer with a base layer prepared above, and on the side of the second retardation layer of the second retardation layer with a base layer prepared above. . The adhesive composition prepared above was coated on the corona-treated surface of the 1st retardation layer with a base material layer, and it bonded together with the corona-treated surface of the 2nd retardation layer with a base material layer. Using an ultraviolet irradiation device (Ultraviolet lamp uses "H-valve" manufactured by Fusion UV Systems Inc.) It irradiated, the adhesive composition was hardened, and the adhesive agent hardened layer with a thickness of 2 micrometers as a 2nd bonding layer was formed. Accordingly, PET film, first retardation layer (first alignment layer, first liquid crystal layer), second bonding layer (adhesive cured layer), second retardation layer (second liquid crystal layer, second alignment layer), PET film A phase difference laminate (1) laminated in this order was obtained.

(Production of circular polarizing plate 1)

After performing corona treatment (output 0.3 kW, processing speed 3 m/min) to the pressure-sensitive adhesive layer A exposed by peeling the light SP film of the pressure-sensitive adhesive sheet A prepared above, and the OC layer of the polarizing plate 1 prepared above, corona The treated surfaces were bonded together. Next, the pressure-sensitive adhesive layer A exposed by peeling the heavy SP film of the pressure-sensitive adhesive sheet A, and the PET film on the first retardation layer side of the retardation laminate 1 were peeled off and exposed to corona treatment (output 0.3 kW, After performing a processing speed|rate of 3 m/min), corona-treated surfaces were bonded together, and this adhesive layer A was made into the 1st bonding layer. Then, the PET film by the side of the 2nd retardation layer was peeled, and the circularly polarizing plate 1 was obtained. The circularly polarizing plate 1 is a polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive layer A), 1st retardation layer, 2nd bonding layer (adhesive agent) cured layer) and the second retardation layer were laminated in this order.

Moreover, since a 1st orientation layer may peel with peeling of a 1st base material layer, and a 2nd base material layer may peel with peeling of a 2nd base material layer similarly, in the circularly polarizing plate 1 The layer structure of the first phase difference layer and the second phase difference layer does not necessarily match the layer structure of the first phase difference layer and the second phase difference layer in the phase difference laminate 1 . The same applies to the following examples and comparative examples.

(Production of optical laminate 1)

After performing corona treatment (output 0.3 kW, processing speed 3 m/min) on the pressure-sensitive adhesive layer A exposed by peeling the second phase difference layer side of the circularly polarizing plate 1 and the light SP film of the pressure-sensitive adhesive sheet A prepared above, The corona-treated surfaces were bonded together, and the circularly polarizing plate 1 with an adhesive layer was obtained.

After peeling the PI-based resin film side of the front plate prepared above, and the light SP film of the pressure-sensitive adhesive sheet A prepared above, corona treatment (output 0.3 kW, processing speed 3 m/min) was performed on the exposed pressure-sensitive adhesive layer A, The corona-treated surfaces were bonded together, and the front plate with an adhesive layer was obtained.

Next, corona treatment (output 0.3 kW, processing speed 3 m/min. ), corona-treated surfaces were bonded together, and the optical laminated body (1) was obtained. As for the optical laminated body 1, the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate 1, the adhesive layer A, and the middle SP film were laminated|stacked in this order.

Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (1). A result is shown in Table 1.

[Example 2]

(Production of phase difference laminate 2)

The first retardation layer side of the first retardation layer with a base material layer prepared above, and the adhesive layer D2 exposed by peeling the light SP film of the pressure-sensitive adhesive sheet D2 prepared above, corona-treated (output 0.3 kW, processing speed 3 m/min) ), the corona-treated surfaces were bonded together. Next, the pressure-sensitive adhesive layer D2 exposed by peeling the heavy SP film of the pressure-sensitive adhesive sheet D2, and a corona treatment (output 0.3 kW, processing speed 3 m/min) on the second retardation layer side of the second retardation layer with a base material layer prepared above After performing, corona-treated surfaces were bonded together, this adhesive layer D2 was made into a 2nd bonding layer, and the retardation laminated body (2) was obtained. Retardation laminated body 2 is PET film, 1st retardation layer (1st orientation layer, 1st liquid crystal layer), 2nd bonding layer (adhesive layer D2), 2nd retardation layer (2nd liquid crystal layer, 2nd orientation) layer) and PET film were laminated in this order.

(Production of circular polarizing plate 2)

Circular polarizing plate 2 in the same manner as in the production of circular polarizing plate 1, except that the adhesive sheet D1 was used in place of the adhesive sheet A and the phase difference laminate 2 was used instead of the phase difference laminate 1 got The circularly polarizing plate 2 is a polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer 1, OC layer), 1st bonding layer (adhesive layer D1), 1st retardation layer, 2nd bonding layer (adhesive) The layer D2) and the second retardation layer were laminated in this order.

(Production of optical laminate 2)

An optical laminate (2) was obtained by the same procedure as that of the optical laminate (1) except that the circular polarizing plate (2) was used instead of the circular polarizing plate (1). As for the optical laminated body 2, the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate 2, the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (2). A result is shown in Table 1.

[Example 3]

(Production of phase difference laminate 3)

The retardation laminated body 3 was obtained by the procedure similar to preparation of the retardation laminated body 2 except having used the adhesive sheet C prepared above instead of the adhesive sheet D2. The retardation layered product 3 is a PET film, a first retardation layer (a first alignment layer, a first liquid crystal layer), a second bonding layer (adhesive layer C), a second retardation layer (a second liquid crystal layer, a second orientation) layer) and PET film were laminated in this order.

(Production of circular polarizing plate 3)

A circularly polarizing plate in the same manner as in the production of the circularly polarizing plate 1, except that the pressure-sensitive adhesive sheet B prepared above was used in place of the pressure-sensitive adhesive sheet A, and the phase difference layered product 3 was used instead of the phase difference layered product 1 (3) was obtained. The circularly polarizing plate 3 is a polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive layer B), 1st retardation layer, 2nd bonding layer (adhesive) Layer C) and the second retardation layer were laminated in this order.

(Production of optical laminate 3)

An optical laminate 3 was obtained by the same procedure as in the preparation of the optical laminate 1 except that the circular polarizing plate 3 was used instead of the circular polarizing plate 1 . As for the optical laminated body 3, the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate 3, the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (3). A result is shown in Table 1.

[Example 4]

(Production of circular polarizing plate 4)

Using the polarizing plate 2 prepared above instead of the polarizing plate 1, using the retardation laminate 2 instead of the retardation laminate 1, and replacing the pressure-sensitive adhesive sheet A with the pressure-sensitive adhesive sheet D1 prepared above Production of the circularly polarizing plate 1 except that the linearly polarizing layer 2 of the polarizing plate 2 and the adhesive layer D1 as the first bonding layer were corona-treated (output 0.3 kW, processing speed 3 m/min) and bonded together. A circularly polarizing plate (4) was obtained by the same procedure as in The circularly polarizing plate 4 includes a polarizing plate 2 (COP film, adhesive cured layer, linearly polarizing layer 2) (COP film, adhesive layer, linearly polarizing layer 2), a first bonding layer (adhesive layer D1), The 1st retardation layer, the 2nd bonding layer (adhesive layer D2), and the 2nd retardation layer were laminated|stacked in this order.

(Production of optical laminate 4)

An optical laminate 4 was obtained in the same procedure as in the production of the optical laminate 1 except that the circularly polarizing plate 4 was used instead of the circularly polarizing plate 1 . As for the optical laminated body 4, the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate 4, the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (4). A result is shown in Table 1.

[Comparative Example 1]

(Production of circular polarizing plate (C1))

A circularly polarizing plate in the same manner as in the production of the circularly polarizing plate 1, except that the phase difference laminate 2 was used instead of the phase difference laminate 1, and the adhesive sheet D2 prepared above was used instead of the adhesive sheet A. (C1) was obtained. Circularly polarizing plate (C1) is polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive layer D2), 1st retardation layer, 2nd bonding layer (adhesive) The layer D2) and the second retardation layer were laminated in this order.

(Production of optical laminate (C1))

An optical laminate (C1) was obtained in the same manner as in the preparation of the optical laminate (1) except that the circularly polarizing plate (C1) was used instead of the circularly polarizing plate (1). As for the optical laminated body (C1), the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate (C1), the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (C1). A result is shown in Table 1.

[Comparative Example 2]

(Production of phase difference laminate (C2))

A retardation layered product (C2) was obtained in the same manner as in the preparation of the retardation layered product (2) except that the pressure sensitive adhesive sheet B prepared above was used instead of the pressure sensitive adhesive sheet D2. Retardation laminated body (C2) PET film, 1st retardation layer (1st orientation layer, 1st liquid crystal layer), 2nd bonding layer (adhesive layer B), 2nd retardation layer (2nd liquid crystal layer, 2nd orientation) layer) and PET film were laminated in this order.

(Production of circular polarizing plate (C2))

A circularly polarizing plate in the same manner as in the production of the circularly polarizing plate 1, except that the adhesive sheet C prepared above was used in place of the adhesive sheet A, and the phase difference laminate (C2) was used instead of the phase difference laminate (1). (C2) was obtained. Circularly polarizing plate (C2) is polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive layer C), 1st retardation layer, 2nd bonding layer (adhesive) Layer B) and the second retardation layer were laminated in this order.

(Production of optical laminate (C2))

An optical laminate (C2) was obtained in the same manner as in the production of the optical laminate (1) except that the circularly polarizing plate (C2) was used instead of the circularly polarizing plate (1). As for the optical laminated body (C2), the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate (C2), the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility, the measurement of (DELTA)S, and visual evaluation were performed using the obtained optical laminated body (C2). A result is shown in Table 1.

[Comparative Example 3]

(Production of phase difference laminate (C3))

A retardation layered product (C3) was obtained in the same manner as in the preparation of the retardation layered product (2) except that the pressure sensitive adhesive sheet D1 prepared above was used instead of the pressure sensitive adhesive sheet D2. Retardation laminated body (C3) PET film, 1st retardation layer (1st orientation layer, 1st liquid crystal layer), 2nd bonding layer (adhesive layer D1), 2nd retardation layer (2nd liquid crystal layer, 2nd orientation) layer) and PET film were laminated in this order.

(Production of circular polarizing plate (C3))

A circular polarizing plate in the same manner as in the production of the circularly polarizing plate 1, except that the adhesive sheet D2 prepared above was used in place of the adhesive sheet A, and the phase difference laminate (C3) was used instead of the phase difference laminate (1). (C3) was obtained. The circularly polarizing plate (C3) is a polarizing plate (1) (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive layer D2), 1st retardation layer, 2nd bonding layer (adhesive agent) Layer D1) and the second retardation layer were laminated in this order.

(Production of optical laminate (C3))

An optical laminate (C3) was obtained in the same manner as in the production of the optical laminate (1) except that the circularly polarizing plate (C3) was used instead of the circularly polarizing plate (1). As for the optical laminated body (C3), the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate (C3), the adhesive layer A, and the middle SP film were laminated|stacked in this order. Flexibility evaluation and visual evaluation were performed using the obtained optical laminated body (C3). Since cracks occurred by the bending test, ΔS was not measured. A result is shown in Table 1.

[Comparative Example 4]

(Production of phase difference laminate (C4))

A retardation layered product (C4) was obtained in the same manner as in the preparation of the retardation layered product (2) except that the pressure sensitive adhesive sheet A prepared above was used in place of the pressure sensitive adhesive sheet D2. Retardation laminated body (C4) PET film, 1st retardation layer (1st orientation layer, 1st liquid crystal layer), 2nd bonding layer (adhesive layer A), 2nd retardation layer (2nd liquid crystal layer, 2nd orientation) layer) and PET film were laminated in this order.

(Production of circular polarizing plate (C4))

Corona treatment (output 0.3 kW, processing speed 3 m/min) was performed on the surface exposed by peeling the PET film on the side of the first retardation layer of the retardation laminate (C4), and the OC layer of the polarizing plate 1 prepared above. . The adhesive composition prepared above was coated on the corona-treated surface by the side of the 1st retardation layer, and it bonded with the corona-treated surface of the polarizing plate 1 . Using an ultraviolet irradiation device (Ultraviolet lamp uses "H valve" manufactured by Fusion UV Systems Inc.) It irradiated, the adhesive composition was hardened, the adhesive agent hardened layer with a thickness of 2 micrometers as a 1st bonding layer was formed, and the circularly polarizing plate (C4) was obtained. Circularly polarizing plate (C4) is polarizing plate 1 (TAC film, orientation layer, linearly polarizing layer (1), OC layer), 1st bonding layer (adhesive hardening layer), 1st retardation layer, 2nd bonding layer (adhesive agent) Layer A) and the second retardation layer were laminated in this order.

(Production of optical laminate (C4))

An optical laminate (C4) was obtained in the same manner as in the preparation of the optical laminate (1) except that the circularly polarizing plate (C4) was used instead of the circularly polarizing plate (1). As for the optical laminated body (C4), the front plate (HC layer, PI resin film), the adhesive layer A, the circularly polarizing plate (C4), the adhesive layer A, and the middle SP film were laminated|stacked in this order. Evaluation of flexibility and visual evaluation were performed using the obtained optical laminated body (C4). Since cracks occurred by the bending test, ΔS was not measured. A result is shown in Table 1.

[Table 1]

1: circular polarizer
5: Optical laminate
11: first retardation layer
12: second retardation layer
21: 1st bonding layer
22: 2nd bonding layer
23: 3rd bonding layer
30: optical layer
31: linear polarization layer
32, 33: protective layer
40: front panel
100: test piece
501, 502: Stage

Claims (11)

A circularly polarizing plate comprising at least an optical layer including a linearly polarizing layer, a first bonding layer, a first phase difference layer, a second bonding layer, and a second phase difference layer in this order,
The first retardation layer includes a first liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound,
The elastic modulus in the temperature of 25 degreeC of a said 1st bonding layer and a said 2nd bonding layer is G'1 [kPa] and G'2 [kPa], respectively, The thickness of a said 1st bonding layer and a said 2nd bonding layer is respectively A circularly polarizing plate which satisfies the relationship of the following formula (1) when d1 [micrometer] and d2 [micrometer].
G'1/d1 ＜ G'2/d2 (1) According to claim 1,
The thickness of the first retardation layer is t [㎛],
In the cross section of the bent part of the said circular polarizing plate after a bending test, the thickness direction between the position closest to the said optical layer side among the surfaces of the said 1st bonding layer side of the said 1st retardation layer and the position furthest from the said optical layer side A circularly polarizing plate that satisfies the relationship of the following formula (2) when the distance is ΔS [μm].
ΔS ≤ 2t (2) A circularly polarizing plate comprising at least an optical layer including a linearly polarizing layer, a first bonding layer, a first phase difference layer, a second bonding layer, and a second phase difference layer in this order,
The first retardation layer includes a first liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound,
The thickness of the first retardation layer is t [㎛],
In the cross section of the bent part of the said circular polarizing plate after a bending test, among the surfaces of the said 1st bonding layer side of the said 1st retardation layer, the thickness direction between the position closest to the said optical layer side and the position furthest from the said optical layer side A circularly polarizing plate that satisfies the relationship of the following formula (2) when the distance is ΔS [μm].
ΔS ≤ 2t (2) 4. The method according to any one of claims 1 to 3,
The second retardation layer is a circularly polarizing plate comprising a second liquid crystal layer that is a cured product layer of a polymerizable liquid crystal compound. 5. The method according to any one of claims 1 to 4,
A thickness of the first retardation layer is 5 µm or less, a circularly polarizing plate. 6. The method according to any one of claims 1 to 5,
The linearly polarizing layer includes a cured product of a polymerizable liquid crystal compound and a dichroic dye. 7. The method according to any one of claims 1 to 6,
The said optical layer is a circularly polarizing plate which is a polarizing plate which has a protective layer on one side or both surfaces of the said linear polarizing layer. 8. The method according to any one of claims 1 to 7,
The first retardation layer and the second retardation layer are the following [a] or [b]:
[a] The first retardation layer is a 1/2 wave plate, and the second retardation layer is a 1/4 wave plate,
[b] One of the first retardation layer and the second retardation layer is a 1/4 wave plate having reverse wavelength dispersion, and the other is a positive C plate,
A circular polarizer that satisfies the relationship of 9. The method according to any one of claims 1 to 8,
The first retardation layer is a 1/4 wave plate having reverse wavelength dispersion,
The second retardation layer is a positive C plate, a circularly polarizing plate. The circularly polarizing plate according to any one of claims 1 to 9;
and a front plate laminated on the optical layer side of the circularly polarizing plate. The display device provided with the optical laminated body of Claim 10.

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