CN110531457B

CN110531457B - Method for manufacturing circular polarizing plate

Info

Publication number: CN110531457B
Application number: CN201910436960.5A
Authority: CN
Inventors: 仲俊之; 仓本贤尚
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2018-05-25
Filing date: 2019-05-23
Publication date: 2022-07-29
Anticipated expiration: 2039-05-23
Also published as: CN110531457A

Abstract

A method for manufacturing a circular polarizing plate comprising a polarizing function layer including at least a linear polarizing layer, an adhesive layer for a polarizing function layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer in this order, comprises the steps of preparing a layer including a liquid crystal layer with a first base material layer, the adhesive layer, the second liquid crystal layer, and the second base material layer in this order on the first liquid crystal layer side of the first liquid crystal layer with a base material layer including a first base material layer and a first liquid crystal layer; a step of forming an exposed surface on the substrate layer side of the first liquid crystal layer by peeling the substrate layer from the layer containing the liquid crystal layer with the first substrate layer; a step of obtaining a layer containing a liquid crystal layer with a first composition layer, the layer being provided with an adhesive composition layer for a polarization function layer for forming an adhesive layer for a polarization function layer on an exposed surface; and a step of bonding the polarizing function layer including the layer of the liquid crystal layer with the first composition layer to the polarizing function layer with the adhesive composition layer. The first liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on the first base material layer.

Description

Method for manufacturing circular polarizing plate

Technical Field

The present invention relates to a method for manufacturing a circularly polarizing plate.

Background

In display devices such as organic EL display devices and liquid crystal display devices, members including optically anisotropic films such as polarizing films and phase difference films are used. In particular, in an organic EL display device, visibility is easily reduced by external light reflection due to a metal electrode, and therefore, a member called a circularly polarizing plate in which a polarizing film and an optically anisotropic film are combined is used for the purpose of preventing the external light reflection. As an optically anisotropic film used for a circularly polarizing plate, an optically anisotropic film in which a layer of a liquid crystal compound is formed on a base film is known. For example, JP2014-222282 a discloses that a liquid crystal material is used for a retardation layer of an optical film used for a circularly polarizing plate or the like.

Disclosure of Invention

In general, since the circularly polarizing plate is provided on the visible side of the organic EL display panel, visibility of the organic EL display device is likely to be reduced if the circularly polarizing plate has appearance defects such as wrinkles, bubbles, or unevenness.

The present invention aims to provide a method for manufacturing a circularly polarizing plate suitable for forming a circularly polarizing plate having a liquid crystal layer.

The present invention provides a method for manufacturing a circularly polarizing plate described below.

A method for manufacturing a circularly polarizing plate comprising a polarizing function layer including at least a linear polarizing layer, an adhesive layer for the polarizing function layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer in this order, the method comprising:

A step of preparing a layer containing a liquid crystal layer with a first base material layer, the layer containing the liquid crystal layer with the first base material layer having the adhesive layer, the second liquid crystal layer, and the second base material layer in this order on the first liquid crystal layer side of the first liquid crystal layer with the base material layer having the first base material layer and the first liquid crystal layer;

a step of peeling the first base material layer from the layer including the liquid crystal layer with the first base material layer to form an exposed surface on the first base material layer side of the first liquid crystal layer;

a step of obtaining a layer containing a liquid crystal layer with a first composition layer, the layer containing the liquid crystal layer with the first composition layer being provided with an adhesive composition layer for a polarization function layer for forming the adhesive layer for a polarization function layer on the exposed surface; and

a step of bonding the polarizing function layer to the adhesive composition layer for a polarizing function layer containing the layer having the liquid crystal layer with the first composition layer,

the first liquid crystal layer is a liquid crystal layer obtained by polymerizing a polymerizable liquid crystal compound on the first base material layer,

the first liquid crystal layer and the second liquid crystal layer satisfy the following relationship [ a ] or [ b ]:

[a] the first liquid crystal layer is 1/2 wave plate, the second liquid crystal layer is 1/4 wave plate,

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

a step of preparing a layer containing a liquid crystal layer with a second base material layer, the layer containing the liquid crystal layer with the second base material layer having the above-described polarization function layer, the above-described adhesive layer for polarization function layer, and a first liquid crystal layer with a base material layer having the above-described first liquid crystal layer and first base material layer in this order from the side of the above-described adhesive layer for polarization function layer;

a step of peeling the first base material layer from the layer including the liquid crystal layer with the second base material layer to form an exposed surface on the first base material layer side of the first liquid crystal layer;

a step of obtaining a layer containing a liquid crystal layer with a second composition layer, the layer containing the liquid crystal layer with the second composition layer being provided with an adhesive composition layer for forming the adhesive layer on the exposed surface; and

a step of bonding the second liquid crystal layer side of a second liquid crystal layer with a substrate layer, which has a second substrate layer and the second liquid crystal layer, to the adhesive composition layer containing the layer of the liquid crystal layer with the second composition layer,

[b] one of the first liquid crystal layer and the second liquid crystal layer is an 1/4 wave plate with reverse wavelength dispersion, and the other is a positive C plate.

The method for manufacturing a circularly polarizing plate according to [ 3 ] above, wherein the step of preparing a layer including a liquid crystal layer having a second base material layer includes:

a step of preparing a polarizing function layer with a composition layer, in which an adhesive composition layer for a polarizing function layer for forming the adhesive layer for a polarizing function layer is provided on the polarizing function layer; and

and a step of bonding the first liquid crystal layer with the substrate layer to the adhesive composition layer for a polarization function layer of the polarization function layer with the composition layer.

[ 4 ] the method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 3 ], wherein the first liquid crystal layer with a base layer includes a first alignment layer between the first liquid crystal layer and the first base layer,

The step of forming an exposed surface peels off the first alignment layer together with the first base material layer.

[ 5 ] the method for manufacturing a circularly polarizing plate according to [ 1 ], wherein the first liquid crystal layer with a substrate layer includes a first alignment layer between the first liquid crystal layer and the first substrate layer,

the layer containing a liquid crystal layer having a first composition layer has the first alignment layer between the first liquid crystal layer and the adhesive composition layer for a polarizing function layer.

[ 6 ] the method for manufacturing a circularly polarizing plate according to [ 2 ] or [ 3 ], wherein the first liquid crystal layer with a substrate layer includes a first alignment layer between the first liquid crystal layer and the first substrate layer,

the layer containing a liquid crystal layer with a second composition layer has the first alignment layer between the first liquid crystal layer and the adhesive composition layer.

The method for producing a circularly polarizing plate according to any one of [ 1 ] to [ 6 ], wherein the first liquid crystal layer contains a leveling agent.

The method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 7 ], wherein the adhesive layer is an adhesive cured layer or an adhesive layer.

[ 9 ] the method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 8 ], wherein the adhesive layer is an adhesive cured layer,

the adhesive composition layer for forming the adhesive layer contains an active energy ray-curable adhesive.

The method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 9 ], wherein the first liquid crystal layer is an 1/2 wave plate, and the second liquid crystal layer is a 1/4 wave plate.

The method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 9 ], wherein the first liquid crystal layer is an 1/4 wave plate having reverse wavelength dispersibility, and the second liquid crystal layer is a normal C plate.

The method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 11 ], wherein the adhesive layer for a polarization function layer is an adhesive cured layer or an adhesive layer.

The method for producing a circularly polarizing plate according to any one of [ 1 ] to [ 12 ], wherein the second liquid crystal layer is a liquid crystal layer obtained by polymerizing a polymerizable liquid crystal compound on the second base material layer.

The method for producing a circularly polarizing plate according to any one of [ 1 ] to [ 13 ], which comprises a step of peeling off the second base material layer after the step of bonding.

The method for manufacturing a circularly polarizing plate according to any one of [ 1 ] to [ 14 ], wherein the polarizing function layer is a polarizing plate including a protective layer on at least one surface of the linearly polarizing layer.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a manufacturing method suitable for manufacturing a circularly polarizing plate can be provided.

Drawings

Fig. 1 (a) to (e) are schematic cross-sectional views schematically showing an example of the process for producing the circularly polarizing plate of the present invention.

Fig. 2 (a) to (c) are schematic cross-sectional views schematically showing the sequence of the manufacturing process of the circularly polarizing plate shown in fig. 1.

Fig. 3 (a) to (c) are schematic cross-sectional views schematically showing the sequence of the manufacturing process of the circularly polarizing plate shown in fig. 2.

Fig. 4 (a) to (d) are schematic cross-sectional views schematically showing other examples of the manufacturing process of the circularly polarizing plate of the present invention.

Fig. 5 (a) to (c) are schematic cross-sectional views schematically showing the sequence of the manufacturing process of the circularly polarizing plate shown in fig. 4.

Description of symbol mark

10 a first liquid crystal layer with a substrate layer, 11 a first substrate layer, 12 a first liquid crystal layer, 20 a second liquid crystal layer with a substrate layer, 21 a second substrate layer, 22 a second liquid crystal layer, 30 an adhesive layer, 30a adhesive composition layer, 31a adhesive layer for a polarizing plate (adhesive layer for a polarizing function layer), 31a adhesive composition layer for a polarizing plate (adhesive composition layer for a polarizing function layer), 34 an adhesive layer, 35 an adhesive composition layer for an optical element, 36a adhesive layer for a polarizing plate (adhesive layer for a polarizing function layer), 36a adhesive composition layer for a polarizing function layer (adhesive composition layer for a polarizing function layer), 41 a layer containing a liquid crystal layer with a substrate layer (layer containing a liquid crystal layer with a second substrate layer), 42 a layer containing a liquid crystal layer, 43 a layer containing a liquid crystal layer with a composition layer (layer containing a liquid crystal layer with a second composition layer), 46 a layer containing a liquid crystal layer with a substrate layer (layer containing a liquid crystal layer with a first substrate layer), 47 a liquid crystal layer-containing layer, 48 a liquid crystal layer-containing layer (a layer containing a liquid crystal layer with a first composition layer), 51 a circular polarizing plate with a substrate layer (circular polarizing plate), 52 a circular polarizing plate, 53 a circular polarizing plate with an adhesive composition layer (circular polarizing plate), 56 a circular polarizing plate with a substrate layer (circular polarizing plate), 57 a circular polarizing plate, 58 a circular polarizing plate with an adhesive composition layer (circular polarizing plate), 60 a polarizing plate (polarizing function layer), 61 a polarizing plate with a composition layer (polarizing function layer with a composition layer), and W width direction.

Detailed Description

The circularly polarizing plate produced by the method for producing a circularly polarizing plate of the present invention is a circularly polarizing plate comprising a polarizing function layer including at least a linear polarizing layer, an adhesive layer for the polarizing function layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer in this order. In the circularly polarizing plate, the first liquid crystal layer is a liquid crystal layer obtained by polymerizing a polymerizable liquid crystal compound on the first base material layer. Further, the first liquid crystal layer and the second liquid crystal layer in the circularly polarizing plate satisfy the following relationship [ a ] or [ b ]:

In the above [ b ], it is preferable that: the first liquid crystal layer is an 1/4 wave plate having reverse wavelength dispersion, and the second liquid crystal layer is a positive C plate.

The circularly polarizing plate can be made extremely thin, and is therefore useful for application to, for example, a flexible organic EL display device that can be bent or rolled, which is a next-generation organic EL display device. Hereinafter, the linear polarizing layer may be simply referred to as a "polarizing layer", and a linear polarizing plate having a protective layer formed on at least one surface of the linear polarizing layer may be simply referred to as a "polarizing plate".

Hereinafter, preferred embodiments of the method for manufacturing a circularly polarizing plate according to the present invention will be described with reference to the drawings. The embodiments and their modifications shown below can be combined arbitrarily. In the embodiments and the modifications thereof, the same members as those already described in the previous embodiments and modifications thereof are denoted by the same reference numerals, and the description thereof is omitted.

[ embodiment 1]

Fig. 1 to 3 are schematic cross-sectional views schematically showing an example (embodiment 1) of the process for producing a circularly polarizing plate of the present invention. In the figure, W represents the width direction. As shown in fig. 3 (b), the circularly polarizing plate 52 obtained by the manufacturing method of the present invention includes, in order: a polarizing plate 60 (polarizing function layer) having a protective layer formed on at least one surface of the polarizing layer, a polarizing plate adhesive layer 36 (polarizing function layer adhesive layer), the first liquid crystal layer 12, the adhesive layer 30, and the second liquid crystal layer 22. As shown in fig. 3 (a) and 3 (c), the circularly polarizing plate obtained by the manufacturing method of the present invention may be a circularly polarizing plate including the second base material layer 21 and the adhesive composition layer 35 for an optical element on the side of the second liquid crystal layer 22 opposite to the adhesive layer 30. As described later, the first liquid crystal layer 12 is preferably a liquid crystal layer containing a leveling agent.

In the method of manufacturing the circularly polarizing plate 52 shown in fig. 3 (b), first, the following steps are performed: a step of preparing a polarizing plate with a composition layer 61 (polarizing function layer with a composition layer) in which a polarizing plate adhesive composition layer for forming a polarizing plate adhesive layer 36a (adhesive composition layer for a polarizing function layer) 36a is provided on one surface of a polarizing plate 60 in the polarizing plate 61 (fig. 1 (a)); a step of preparing a first liquid crystal layer 10 with a substrate layer (fig. 1 (b)), the first liquid crystal layer 10 with a substrate layer having a structure in which a first liquid crystal layer 12 is laminated on a first substrate layer 11; and a step of preparing a substrate-layer-attached second liquid crystal layer 20 (fig. 1 (c)), the substrate-layer-attached second liquid crystal layer 20 having a structure in which a second liquid crystal layer 22 is laminated on a second substrate layer 21.

When the polarizing plate adhesive layer 36 of the circularly polarizing plate 52 is an adhesive cured layer, the step of preparing the polarizing plate 61 with a composition layer may include a step of applying an adhesive to one surface of the polarizing plate 60, or may include a step of drying the applied adhesive as necessary. When the polarizing plate adhesive layer 36 of the circularly polarizing plate 52 is an adhesive layer, the step of preparing the polarizing plate 61 with a composition layer may include a step of applying an adhesive to one surface of the polarizing plate 60, a step of drying the applied adhesive as needed, or a step of forming an adhesive layer on a release-treated surface of a release film and transferring the adhesive layer of the release film to the polarizing plate 60.

The step of preparing the first liquid crystal layer 10 with a substrate layer may be any step as long as the first liquid crystal layer 10 with a substrate layer including the first substrate layer 11 and the first liquid crystal layer 12 obtained by polymerizing the polymerizable liquid crystal compound on the first substrate layer 11 can be prepared, and the step of polymerizing the polymerizable liquid crystal compound on the first substrate layer 11 to form the first liquid crystal layer 12 may be provided. When the polymerizable liquid crystal compound is polymerized on the first substrate layer 11, the first liquid crystal layer 12 may be formed by applying a composition for forming a liquid crystal layer containing the polymerizable liquid crystal compound on the first substrate layer 11, drying the composition, and then polymerizing the polymerizable liquid crystal compound. The composition for forming a liquid crystal layer may contain a solvent, a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, and the like in addition to the polymerizable liquid crystal compound. In particular, in the present invention, when the composition for forming a liquid crystal layer includes the leveling agent (when the first liquid crystal layer includes the leveling agent), a more significant effect is exhibited.

Similarly, the step of preparing the second liquid crystal layer 20 with a substrate layer may include a step of polymerizing a polymerizable liquid crystal compound on the second substrate layer 21 to form the second liquid crystal layer 22, or may include a step of applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound on the second substrate layer 21, drying the composition, and then polymerizing the polymerizable liquid crystal compound to form the second liquid crystal layer 22.

Next, the adhesive composition layer for polarizing plate 36a of the polarizing plate 61 with a composition layer is bonded to the first liquid crystal layer 12 of the first liquid crystal layer 10 with a substrate layer ((d) of fig. 1), and the adhesive layer for polarizing plate 36 is formed from the adhesive composition layer for polarizing plate 36a to obtain a layer 41 containing a liquid crystal layer with a substrate layer (a layer containing a liquid crystal layer with a second substrate layer)) (e) of fig. 1. As a method for forming the adhesive layer 36 for a polarizing plate from the adhesive composition layer 36a for a polarizing plate, selection may be made depending on the components contained in the adhesive composition layer 36a for a polarizing plate, and for example, a treatment for curing the adhesive composition layer 36a for a polarizing plate may be performed, and in the case where the components for the curing treatment are not required, the adhesive composition layer 36a for a polarizing plate may be formed into the adhesive layer 36 for a polarizing plate without performing a special treatment. As shown in fig. 1 (e), the layer 41 including the liquid crystal layer with a base layer includes a polarizing plate 60, a polarizing plate adhesive layer 36, the first liquid crystal layer 12, and the first base layer 11 in this order.

Next, a method of obtaining the circularly polarizing plate 52 from the layer 41 including the liquid crystal layer with a substrate layer prepared as described above will be described with reference to fig. 2 and 3. First, the first base material layer 11 is peeled from the layer 41 including the liquid crystal layer with a base material layer, thereby obtaining the liquid crystal layer-containing layer 42 including the polarizing plate 60, the polarizing plate adhesive layer 36, and the first liquid crystal layer 12 in this order (fig. 2 (a)). Then, a step of obtaining a layer 43 containing a liquid crystal layer with a composition layer (a layer containing a liquid crystal layer with a second composition layer) (fig. 2 (b)) is performed, in which the layer 43 containing a liquid crystal layer with a composition layer is provided with an adhesive composition layer 30a for forming the adhesive layer 30 on the layer 42 containing a liquid crystal layer. In the step of obtaining the layer 43 containing the liquid crystal layer with a composition layer, as shown in fig. 2 (b), the adhesive composition layer 30a is formed on the exposed surface of the first base material layer 11 side of the first liquid crystal layer 12 exposed by peeling the first base material layer 11 from the layer 41 containing the liquid crystal layer with a base material layer of the layer 42 containing a liquid crystal layer. When the adhesive layer 30 of the circularly polarizing plate 52 (fig. 3 (b)) is an adhesive cured layer, the step of forming the adhesive composition layer 30a on the layer 42 containing a liquid crystal layer may include a step of applying an adhesive to the layer 42 containing a liquid crystal layer, or may include a step of drying the applied adhesive as necessary. In the case where the adhesive layer 30 of the circularly polarizing plate 52 (fig. 3 b) is an adhesive layer, the step of forming the adhesive composition layer 30a on the liquid crystal layer-containing layer 42 may include a step of applying an adhesive to the liquid crystal layer-containing layer 42 and, if necessary, drying the applied adhesive, or a step of forming an adhesive layer on a release-treated surface of a release film and transferring the adhesive layer of the release film to the liquid crystal layer-containing layer 42. As shown in fig. 2 (b), the layer 43 containing a liquid crystal layer having a composition layer includes a polarizing plate 60, a polarizing plate adhesive layer 36, the first liquid crystal layer 12, and an adhesive composition layer 30a in this order.

Next, a step of bonding the adhesive composition layer 30a including the liquid crystal layer with composition layer 43 to the second liquid crystal layer 22 of the second liquid crystal layer with substrate 20 shown in fig. 1 c was performed (fig. 2 c), and the adhesive layer 30 was formed from the adhesive composition layer 30a to obtain a circularly polarizing plate 51 (circularly polarizing plate) with substrate (fig. 3 a). As a method of forming the adhesive layer 30 from the adhesive composition layer 30a, it is sufficient if selected according to the components contained in the adhesive composition layer 30a, and for example, a treatment of curing the adhesive composition layer 30a may be performed, and in the case of a component that does not require a curing treatment, the adhesive composition layer 30a may be formed into the adhesive layer 30 without performing a special treatment. As shown in fig. 3 (a), the circularly polarizing plate with a substrate layer 51 includes a polarizing plate 60, a polarizing plate adhesive layer 36, a first liquid crystal layer 12, an adhesive layer 30, a second liquid crystal layer 22, and a second substrate layer 21 in this order, and thus may be a circularly polarizing plate obtained in the present invention and also a circularly polarizing plate with a substrate layer having a second substrate layer 21.

The method of manufacturing the circularly polarizing plate 52 may further include: after the step of bonding the layer 43 including the liquid crystal layer with a composition layer to the second liquid crystal layer 20 with a substrate layer, the step of peeling off the second substrate layer 21 (fig. 3 (b)), specifically, the step of peeling off the second substrate layer 21 from the circularly polarizing plate with a substrate layer 51 (fig. 3 (b)). In addition, the method of manufacturing the circularly polarizing plate 52 may further include: a step of forming the adhesive composition layer 35 for an optical element on the exposed surface of the second liquid crystal layer 22 on the second base material layer 21 side, which is exposed by peeling the second base material layer 21, to obtain a circularly polarizing plate 53 (circularly polarizing plate) with an adhesive composition layer (fig. 3 (c)). As shown in fig. 3 (c), the circularly polarizing plate with adhesive composition layer 53 includes the polarizing plate 60, the polarizing plate adhesive layer 36, the first liquid crystal layer 12, the adhesive layer 30, the second liquid crystal layer 22, and the optical element adhesive composition layer 35 in this order, and thus may be a circularly polarizing plate obtained in the present invention and may also be a circularly polarizing plate with adhesive composition layer having an optical element adhesive composition layer.

In the method for producing the circularly polarizing plate 52, as shown in fig. 1 (e), 2 (a) and 2 (b), the adhesive composition layer 30a is formed on the exposed surface of the first base material layer 11 side of the first liquid crystal layer 12 (hereinafter, sometimes referred to as "the exposed surface of the liquid crystal layer-containing layer 42") exposed by peeling the first base material layer 11 from the liquid crystal layer-containing layer 41 including the substrate layer of the liquid crystal layer-containing layer 42. The adhesive composition layer 30a exhibits more affinity with the exposed surface of the liquid crystal layer-containing layer 42 than the side of the first liquid crystal layer 12 opposite to the first base material layer 11. Therefore, when the adhesive composition layer 30a is formed on the exposed surface of the liquid crystal layer-containing layer 42, the adhesive composition layer 30a can be formed on the exposed surface of the liquid crystal layer-containing layer 42 with high adhesion force, as compared with the case where the adhesive composition layer is formed on the opposite side of the first liquid crystal layer 12 from the first base material layer 11.

The reason for this is presumed to be as follows. Consider that: since the first liquid crystal layer 12 is formed by polymerizing (reacting) a polymerizable liquid crystal compound on the first base material layer 11, the exposed surface of the layer 42 including the liquid crystal layer and the surface characteristics of the first liquid crystal layer 12 on the side opposite to the first base material layer 11 (the side exposed to the atmosphere at the time of polymerization of the polymerizable liquid crystal compound) of the first liquid crystal layer 12 are different. Presumably: due to such a difference in surface characteristics, the affinity of each surface for the adhesive composition constituting the adhesive composition layer 30a is different, and the adhesive composition layer 30a can be formed by suppressing shrinkage of the exposed surface of the layer 42 including the liquid crystal layer more than the side of the first liquid crystal layer 12 opposite to the first base material layer 11. The results are considered to be: the exposed surface of the liquid crystal layer-containing layer 42 can further suppress the occurrence of unevenness in the adhesive composition layer 30a formed on the liquid crystal layer-containing layer 42 than the side of the first liquid crystal layer 12 opposite to the first base material layer 11, and the liquid crystal layer-containing layer 42 and the adhesive composition layer 30a can be laminated with high adhesion. It is thus assumed that: the circularly polarizing plate 52 can be prevented from being wrinkled or bubbles can be generated between the layer 42 containing a liquid crystal layer and the adhesive layer 30, and the layer 42 containing a liquid crystal layer and the second liquid crystal layer 22 can be laminated with high adhesion. Further, since the occurrence of unevenness, wrinkles, and bubbles in the circularly polarizing plate 52 is suppressed, a circularly polarizing plate having a good appearance can be obtained, and the visibility can be suppressed from being lowered when the circularly polarizing plate is applied to an organic EL display device.

It is presumed that: in particular, when the first liquid crystal layer 12 is formed by applying a liquid crystal layer-forming composition containing both a polymerizable liquid crystal compound and a leveling agent on the first substrate layer 11, the difference between the surface properties of the first liquid crystal layer 12 on the first substrate layer 11 side and the surface properties on the opposite side tends to increase. This is considered to be because: the leveling agent has a function of adjusting the flatness of the coating layer formed by applying the composition for forming a liquid crystal layer and the first liquid crystal layer obtained from the coating layer, and in the first liquid crystal layer 12 formed by applying the composition for forming a liquid crystal layer containing the leveling agent, the leveling agent is likely to accumulate on the side opposite to the first base material layer 11 (the side exposed to the atmosphere at the time of polymerization of the polymerizable liquid crystal compound). Presume that: the adhesion composition layer 30a has higher affinity for the adhesion composition constituting the adhesion composition layer 30a because the amount of the leveling agent is smaller on the side exposed by peeling the first base material layer 11 from the layer 41 containing the liquid crystal layer with a base material layer, that is, on the exposed surface of the layer 42 containing the liquid crystal layer, than on the side opposite to the first base material layer 11 of the first liquid crystal layer 12. It is thus assumed that: when the first liquid crystal layer contains the leveling agent, the exposed surface of the liquid crystal layer-containing layer 42 is likely to suppress the occurrence of unevenness in the adhesive composition layer 30a formed on the liquid crystal layer-containing layer 42, and the liquid crystal layer-containing layer 42 and the adhesive composition layer 30a can be laminated with higher adhesion force, thereby obtaining a circularly polarizing plate with good appearance.

In the present invention, the film-like materials such as the first liquid crystal layer with a substrate layer 10, the second liquid crystal layer with a substrate layer 20, the polarizing plate with a composition layer 61, and the laminate obtained by using them, which are used for producing the circularly polarizing plate, are preferably long film-like materials, and the respective steps are preferably performed while continuously conveying them. The width direction W is a direction orthogonal to the longitudinal direction of the film.

The method for manufacturing the circularly polarizing plate of the present invention may be modified as in the modification shown below. In addition, the above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 1)

The above description has exemplified the case of using the substrate-attached first liquid crystal layer 10 (fig. 1 (b)) in which the first liquid crystal layer 12 is formed on the first substrate layer 11 and the substrate-attached second liquid crystal layer 20 (fig. 1 (c)) in which the second liquid crystal layer 22 is formed on the second substrate layer 21, but the present invention is not limited thereto. The first liquid crystal layer with the substrate layer may have a first alignment layer between the first substrate layer and the first liquid crystal layer, and the second liquid crystal layer with the substrate layer may have a second alignment layer between the second substrate layer and the second liquid crystal layer.

When the first liquid crystal layer with a base layer has a first alignment layer, the circularly polarizing plate obtained by the method for producing a circularly polarizing plate of the present invention may have the first alignment layer or may not have the first alignment layer. When the circularly polarizing plate has the first alignment layer, the adhesion force between the layers may be adjusted so that the first alignment layer remains on the first liquid crystal layer when the first base material layer is peeled from the layer including the liquid crystal layer having the base material layer, and when the circularly polarizing plate does not have the first alignment layer, the adhesion force between the layers may be adjusted so that the first alignment layer and the first base material layer can be peeled together when the first base material layer is peeled from the layer including the liquid crystal layer having the base material layer. In the case where the circularly polarizing plate has the first alignment layer, the layer containing the liquid crystal layer has the first alignment layer on the side of the first liquid crystal layer 12 opposite to the polarizing plate adhesive layer 36, and the liquid crystal layer with the composition layer has the first alignment layer between the first liquid crystal layer 12 and the adhesive composition layer 30 a. The present inventors confirmed that: even when the exposed surface of the layer containing the liquid crystal layer formed by peeling the first base material layer from the layer containing the liquid crystal layer with the base material layer is the first alignment layer, the affinity for the adhesive composition is higher than that of the first liquid crystal layer on the side opposite to the first base material layer. It is therefore assumed that: even when the exposed surface of the layer containing a liquid crystal layer is the first alignment layer, the layer containing a liquid crystal layer and the adhesive composition layer can be laminated with high adhesion by forming the adhesive composition layer on the first alignment layer.

In the case where the second liquid crystal layer 20 with a substrate layer has a second alignment layer, the circularly polarizing plate may have the second alignment layer or may not have the second alignment layer. When the second liquid crystal layer with a base material layer has the second alignment layer, the adhesion force between the layers may be adjusted so that the second alignment layer remains in the second liquid crystal layer when the second base material layer is peeled from the circularly polarizing plate with a base material layer, or so that the second alignment layer can be peeled together with the second base material layer. In the case where the circularly polarizing plate includes the second alignment layer, the second alignment layer is provided on the side of the second liquid crystal layer opposite to the adhesive layer, and the adhesive composition layer for an optical element is formed on the second alignment layer.

The adhesion force between the layers can be adjusted by using the components contained in the layers or by surface treatment of the surfaces of the layers. For example, the adhesion force between the alignment layer (first alignment layer or second alignment layer) and the substrate layer (first substrate layer or second substrate layer) and the liquid crystal layer (first liquid crystal layer or second liquid crystal layer) can be adjusted by the kind or amount of an additive such as a polymerization initiator, a reactive additive, a leveling agent, or a polymerization inhibitor contained in the alignment layer or the liquid crystal layer, or by surface treatment such as corona treatment, plasma treatment, or flame treatment performed on the surface on the alignment layer side of the substrate layer or the surface of the alignment layer provided on the substrate layer.

(modification 2 of embodiment 1)

The case of using the polarizing plate 60 and the polarizing plate 61 with a composition layer was described above as an example, but the method for manufacturing a circularly polarizing plate of the present invention is not limited thereto. Instead of the polarizing plate 60 and the polarizing plate 61 with a composition layer, a transfer substrate layer with a composition layer, in which a transfer substrate layer and an adhesive composition layer for a transfer substrate for forming an adhesive layer for a transfer substrate are provided on one surface of the transfer substrate layer, may be used. The transfer substrate adhesive composition layer may be formed in the same manner as the polarizing plate adhesive layer 36.

In the case of using the transfer substrate layer with the composition layer, the first liquid crystal layer of the first liquid crystal layer with the substrate layer may be bonded to the adhesive composition layer for transfer substrate of the transfer substrate layer with the composition layer, and the adhesive layer for transfer substrate may be formed from the adhesive composition layer for transfer substrate to obtain a layer containing the liquid crystal layer with the substrate layer. The method for forming the transfer substrate adhesive layer from the transfer substrate adhesive composition layer can be performed in the same manner as the method for forming the polarizing plate adhesive layer 36 from the polarizing plate adhesive composition layer 36 a. The obtained layer containing the liquid crystal layer with the substrate layer includes a transfer substrate layer, an adhesive layer for the transfer substrate layer, a first liquid crystal layer, and a first substrate layer in this order.

Next, the first base material layer is peeled from the layer containing the liquid crystal layer with the base material layer to form an exposed surface on the first base material layer side of the first liquid crystal layer, thereby obtaining a layer containing the liquid crystal layer including the transfer base material layer, the adhesive layer for the transfer base material layer, and the first liquid crystal layer in this order. After an adhesive composition layer was provided on the first liquid crystal layer side of the obtained layer containing a liquid crystal layer by the same procedure as in the above-described embodiment, the adhesive composition layer was bonded to the second liquid crystal layer of the second liquid crystal layer with a substrate layer. Next, the second base material layer is peeled off, and the composition layer of the polarizing plate with the composition layer is bonded to the exposed surface of the second liquid crystal layer formed on the second base material layer side, whereby a circularly polarizing plate can be obtained. In the circularly polarizing plate according to the present modification, the transfer base material adhesive composition layer may be used as the optical element adhesive composition layer in the above-described embodiment, and the transfer base material layer may be used as the spacer.

In the case where the layer including the liquid crystal layer with the substrate layer includes the transfer substrate layer, the layer including the liquid crystal layer can be obtained by peeling the first substrate layer without peeling the transfer substrate layer in the step of forming the exposed surface on the substrate layer side of the first liquid crystal layer.

In the present modification, the retardation layers constituting the first liquid crystal layer and the second liquid crystal layer satisfy the following relationship [ a' ] or [ b ]:

[ a' ] the first liquid crystal layer is an 1/4 wave plate, the second liquid crystal layer is a 1/4 wave plate,

In the above [ b ], it is preferable that the first liquid crystal layer is a positive C plate, and the second liquid crystal layer is an 1/4 wave plate having reverse wavelength dispersibility.

[ embodiment 2]

Fig. 4 to 5 are schematic cross-sectional views schematically showing an example (embodiment 2) of the process for producing the circularly polarizing plate of the present invention. In the figure, W represents the width direction. As shown in fig. 5 (b), the layer structure of the circularly polarizing plate 57 obtained by the manufacturing method of the present invention includes a polarizing plate 60 (polarizing function layer) having a protective layer formed on at least one surface of a polarizing layer, a polarizing plate adhesive layer 31 (polarizing function layer adhesive layer), the first liquid crystal layer 12, an adhesive layer 34 (adhesive layer), and the second liquid crystal layer 22 in this order. As shown in fig. 5 (a) and (c), the circularly polarizing plate obtained by the manufacturing method of the present invention may be a circularly polarizing plate including the second base material layer 21 or the adhesive composition layer 35 for an optical element on the side of the second liquid crystal layer 22 opposite to the adhesive layer 34.

In the method for manufacturing the circularly polarizing plate 57 shown in fig. 5 (b), the following steps are performed: a step of preparing the first liquid crystal layer 10 with a substrate layer (fig. 1 b) described in the above embodiment, the first liquid crystal layer 10 with a substrate layer having a structure in which the first liquid crystal layer 12 is laminated on the first substrate layer 11 (substrate layer); and a step of preparing a substrate-layer-attached second liquid crystal layer 20 (fig. 1 (c)), the substrate-layer-attached second liquid crystal layer 20 having a structure in which a second liquid crystal layer 22 is laminated on a second substrate layer 21. The step of preparing the first liquid crystal layer 10 with a substrate layer may be a step of preparing the first liquid crystal layer 10 with a substrate layer including the first substrate layer 11 and the first liquid crystal layer 12 obtained by polymerizing the polymerizable liquid crystal compound on the first substrate layer 11, or may be a step of polymerizing the polymerizable liquid crystal compound on the first substrate layer 11 to form the first liquid crystal layer 12. Similarly, the step of preparing the second liquid crystal layer 20 with a substrate layer may include a step of polymerizing a polymerizable liquid crystal compound on the second substrate layer 21 to form the second liquid crystal layer 22.

Next, the first liquid crystal layer 10 with a substrate layer and the second liquid crystal layer 20 with a substrate layer are laminated so that the first liquid crystal layer 12 and the second liquid crystal layer 22 face each other with the adhesive layer 34 interposed therebetween, and a layer 46 (a layer including a liquid crystal layer with a first substrate layer) including a liquid crystal layer with a substrate layer is obtained (fig. 4 (a)). As shown in fig. 4 (a), the layer 46 including the liquid crystal layer with a substrate layer includes the first substrate layer 11, the first liquid crystal layer 12, the adhesive layer 34, the second liquid crystal layer 22, and the second substrate layer 21 in this order.

Next, a method of obtaining the circularly polarizing plate 57 from the layer 46 including the liquid crystal layer with a substrate layer prepared as described above will be described with reference to fig. 4 and 5. First, the first base material layer 11 is peeled from the layer 46 including the liquid crystal layer with a base material layer, thereby obtaining a layer 47 including the liquid crystal layer, which includes the first liquid crystal layer 12, the adhesive layer 34, the second liquid crystal layer 22, and the second base material layer 21 in this order (fig. 4 (b)).

Then, a step of obtaining a layer 48 containing a liquid crystal layer with a composition layer (layer containing a liquid crystal layer with a first composition layer) (fig. 4 (c)) is performed, in which the layer 48 containing a liquid crystal layer with a composition layer is provided with a polarizing plate adhesive composition layer 31a (polarizing function layer adhesive composition layer) for forming the polarizing plate adhesive layer 31 on the layer 47 containing a liquid crystal layer. In the step of obtaining the layer 48 containing the liquid crystal layer with a composition layer, as shown in fig. 4 (c), the adhesive composition layer 31a for a polarizing plate is formed on the exposed surface of the first base material layer 11 side of the first liquid crystal layer 12 exposed by peeling the first base material layer 11 from the layer 46 containing the liquid crystal layer with a base material layer of the layer 47 containing a liquid crystal layer. When the polarizing plate adhesive layer 31 of the circularly polarizing plate 57 (fig. 5 (b)) is an adhesive cured layer, the step of forming the polarizing plate adhesive composition layer 31a on the liquid crystal layer-containing layer 47 may include a step of applying an adhesive to the liquid crystal layer-containing layer 47, or may include a step of drying the applied adhesive as needed. When the polarizing plate adhesive layer 31 of the circularly polarizing plate 57 (fig. 5 b) is an adhesive layer, the step of forming the polarizing plate adhesive composition layer 31a on the liquid crystal layer-containing layer 47 may include a step of applying an adhesive to the liquid crystal layer-containing layer 47, a step of drying the applied adhesive as needed, or a step of forming an adhesive layer on a release-treated surface of a release film and transferring the adhesive layer of the release film to the liquid crystal layer-containing layer 47. As shown in fig. 4 (c), the layer 48 containing a liquid crystal layer with a composition layer includes the adhesive composition layer 31a for a polarizing plate, the first liquid crystal layer 12, the adhesive layer 34, the second liquid crystal layer 22, and the second base material layer 21 in this order.

Next, a step of bonding the adhesive composition layer 31a for polarizing plate including the layer 48 of the liquid crystal layer with a composition layer to the polarizing plate 60 is performed (fig. 4 (d)), and the adhesive layer 31 for polarizing plate is formed from the adhesive composition layer 31a for polarizing plate, thereby obtaining a circularly polarizing plate 56 (circularly polarizing plate) with a substrate layer (fig. 5 (a)). As a method for forming the adhesive layer 31 for a polarizing plate from the adhesive composition layer 31a for a polarizing plate, selection may be made depending on the components contained in the adhesive composition layer 31a for a polarizing plate, and for example, a treatment for curing the adhesive composition layer 31a for a polarizing plate may be performed, and in the case where the components for the curing treatment are not required, the adhesive composition layer 31a for a polarizing plate may be formed into the adhesive layer 31 for a polarizing plate without performing a special treatment. As shown in fig. 5 (a), the circularly polarizing plate with substrate layer 56 includes a polarizing plate 60, a polarizing plate adhesive layer 31, a first liquid crystal layer 12, an adhesive layer 34, a second liquid crystal layer 22, and a second substrate layer 21 in this order, and thus can be a circularly polarizing plate obtained in the present invention and also a circularly polarizing plate with substrate layer having a second substrate layer 21.

The method of manufacturing the circularly polarizing plate 57 may further include: a step of peeling the second base material layer 21 from the circularly polarizing plate with base material layer 56 (b) of fig. 5), and a step of forming the adhesive composition layer for optical element 35 on the exposed surface side of the second liquid crystal layer 22 exposed by peeling the second base material layer 21 on the second base material layer 21 side to obtain a circularly polarizing plate with adhesive composition layer 58 (circularly polarizing plate) (fig. 5 ((c)). As shown in fig. 5 (c), the circularly polarizing plate with adhesive composition layer 58 includes the polarizing plate 60, the polarizing plate adhesive layer 31, the first liquid crystal layer 12, the adhesive layer 34, the second liquid crystal layer 22, and the optical element adhesive composition layer 35 in this order, and thus can be a circularly polarizing plate obtained in the present invention and also a circularly polarizing plate with adhesive composition layer having an optical element adhesive composition layer.

In the method for producing the circularly polarizing plate 57, as shown in fig. 4 (a) to (c), the adhesive composition layer 31a for polarizing plate is formed on the exposed surface of the first liquid crystal layer 12 on the first base material layer 11 side (hereinafter, sometimes referred to as "the exposed surface of the liquid crystal layer-containing layer 47") exposed by peeling the first base material layer 11 from the liquid crystal layer-containing layer 46 with a base material layer of the liquid crystal layer-containing layer 47. The adhesive composition layer 31a for a polarizing plate exhibits affinity with the exposed surface of the liquid crystal layer-containing layer 47, more than the side of the first liquid crystal layer 12 opposite to the first base material layer 11. Therefore, when the adhesive composition layer 31a for a polarizing plate is formed on the exposed surface of the layer 47 including the liquid crystal layer, the adhesive composition layer 31a for a polarizing plate can be formed on the layer 47 including the liquid crystal layer with high adhesion, as compared with the case where the adhesive composition layer 31a for a polarizing plate is formed on the side of the first liquid crystal layer 12 opposite to the first base material layer 11.

As already described in the previous embodiments, the reason for this is considered to be that: since the first liquid crystal layer 12 is formed by polymerizing (reacting) the polymerizable liquid crystal compound on the first base material layer 11, the surface characteristics of the exposed surface of the layer 47 including the liquid crystal layer are different from the surface characteristics of the opposite side (the side exposed to the atmosphere at the time of polymerization of the polymerizable liquid crystal compound), and the exposed surface of the layer 47 including the liquid crystal layer is more suppressed in shrinkage than the side of the first liquid crystal layer 12 opposite to the first base material layer 11, thereby forming the adhesive composition layer 31a for a polarizing plate. It is presumed that: the exposed surface of the liquid crystal layer-containing layer 47 can be laminated with high adhesion between the liquid crystal layer-containing layer 47 and the polarizing adhesive composition layer 31a while suppressing the occurrence of unevenness in the polarizing adhesive composition layer 31a formed on the liquid crystal layer-containing layer 47, and can be laminated with high adhesion between the liquid crystal layer-containing layer 47 and the polarizing adhesive layer 31 while suppressing the occurrence of wrinkles in the circularly polarizing plate 57 or the occurrence of air bubbles between the liquid crystal layer-containing layer 47 and the polarizing adhesive layer 31, as compared with the side of the first liquid crystal layer 12 opposite to the first base material layer 11. Further, since the occurrence of unevenness, wrinkles, and bubbles in the circularly polarizing plate 52 is suppressed, a circularly polarizing plate having a good appearance can be obtained, and the visibility can be suppressed from being lowered when the circularly polarizing plate is applied to an organic EL display device.

Presumably: as described in the above embodiments, when the first liquid crystal layer 12 is formed by applying the liquid crystal layer forming composition including the polymerizable liquid crystal compound and the leveling agent on the first base material layer 11, the difference between the surface property of the first liquid crystal layer 12 on the first base material layer 11 side and the surface property on the opposite side tends to be large depending on the difference in the amount of the leveling agent. It is therefore assumed that: since the amount of the leveling agent is smaller on the side exposed by peeling the first base material layer 11 from the layer 46 containing the liquid crystal layer with a base material layer, that is, on the exposed surface of the layer 47 containing the liquid crystal layer, than on the side opposite to the first base material layer 11 of the first liquid crystal layer 12, the occurrence of unevenness in the adhesive composition layer 31a for polarizing plate formed on the layer 47 containing the liquid crystal layer is easily suppressed, and the layer 47 containing the liquid crystal layer and the adhesive composition layer 31a for polarizing plate can be laminated with higher adhesion force, thereby obtaining a circularly polarizing plate with good appearance.

In the present embodiment, the first liquid crystal layer with a substrate layer 10, the second liquid crystal layer with a substrate layer 20, the polarizing plate 60, and the film-like material such as a laminate obtained by using them, which are used for producing the circularly polarizing plate, are preferably long film-like materials, and the respective steps are preferably performed while continuously conveying them. The width direction W is a direction orthogonal to the longitudinal direction of the film.

The method for manufacturing the circularly polarizing plate of the present embodiment may be modified as in the modification shown below. The above-described embodiments and the modifications described below may be combined as desired.

(modification of embodiment 2)

In the present embodiment, as in the previous embodiments, the first liquid crystal layer with a substrate layer may have a first alignment layer between the first substrate layer and the first liquid crystal layer, and the second liquid crystal layer with a substrate layer may have a second alignment layer between the second substrate layer and the second liquid crystal layer. The description of the case of having the first alignment layer and the second alignment layer is as described in the modification of the above embodiment, and therefore, the description thereof is omitted.

(embodiment mode 3)

The present application also provides a method for manufacturing a circularly polarizing plate including a polarizing function layer including at least a linear polarizing layer, an adhesive layer for the polarizing function layer, and a liquid crystal layer in this order, the method comprising:

preparing a liquid crystal layer with a substrate layer having a liquid crystal layer formed of a composition containing a polymerizable liquid crystal compound on a first substrate layer;

A step of peeling the first base material layer from the liquid crystal layer with the base material layer;

a step of applying an adhesive composition to a release surface formed by releasing the first base material layer and curing the adhesive composition to provide an adhesive layer for a polarizing function layer; and

and a step of bonding the polarizing function layer to the adhesive layer for a polarizing function layer formed on the release surface.

In this embodiment, the liquid crystal layer may be the first liquid crystal layer or the second liquid crystal layer.

In the case where the liquid crystal layer of the circularly polarizing plate in this embodiment is the first liquid crystal layer, the circularly polarizing plate may further include a second liquid crystal layer. When the circularly polarizing plate in this embodiment further includes a second liquid crystal layer, the circularly polarizing plate includes the above-described polarization function layer, the adhesion layer for a polarization function layer, the first liquid crystal layer, and the second liquid crystal layer in this order.

The first liquid crystal layer with the substrate layer may be the first liquid crystal layer with the first substrate layer described above, or may be the first liquid crystal layer with the second substrate layer described above.

The composition containing the polymerizable liquid crystal compound preferably further contains a leveling agent.

The polarizing function layer, the polarizing function layer adhesive layer, the first liquid crystal layer, the second liquid crystal layer, the leveling agent, and the steps in this embodiment may be configured in the same manner as in the previous embodiment.

Although the embodiments and the modifications of the present invention have been described above, the present invention is not limited to these embodiments and modifications, and for example, the configurations and steps of the embodiments and the modifications may be combined and implemented. The following describes in detail various matters common to all the embodiments and modifications thereof.

(circularly polarizing plate obtained by the production method of the present invention)

In the circularly polarizing plate 52 shown in fig. 3 (b) and the circularly polarizing plate 57 shown in fig. 5 (b), the polarizing plate 60 is a linear polarizing plate, the first liquid crystal layer 12 is an 1/2 wave plate, and the second liquid crystal layer 22 is an 1/4 wave plate. The polarizing plate 60 is a linear polarizing plate, the first liquid crystal layer 12 is an 1/4 wave plate having reverse wavelength dispersibility, and the second liquid crystal layer 22 is a positive C plate, or the first liquid crystal layer 12 is a positive C plate, and the second liquid crystal layer 22 is a 1/4 wave plate having reverse wavelength dispersibility.

(polarizing function layer)

As the polarizing function layer, a polarizing plate having a protective layer formed on at least one surface of the polarizing layer, and a polarizing plate with a protective film in which a protective film is laminated on at least one surface of the polarizing plate can be used. The polarizing layer or the polarizing plate may have a polarizing function layer having 1 kind of functional film out of a reflective film, a semi-transmissive reflective film, an optical compensation film, a film with an antiglare function, and a retardation film, or may have a multilayer structure having 2 or more kinds of functional films. The polarizing layer included in the polarizing function layer may be a liquid crystal layer, that is, a polarizing layer formed using a polymerizable liquid crystal compound (described later). In the present specification, the "polarizing layer" refers to a linear polarizing layer having a property of transmitting a linear polarized light having a vibration plane perpendicular to an absorption axis when an unpolarized light is incident.

(Linear polarizing layer (polarizing layer))

The polarizing layer included in the polarizing function layer is preferably a polarizing layer in which a dichroic dye such as iodine is adsorbed and oriented on a film after the polyvinyl alcohol resin film is oriented. The polarizing layer may be a polarizing layer in which a dichroic dye is adsorbed and oriented on a single polyvinyl alcohol resin film (a film in which polyvinyl alcohol molecules contained in the polyvinyl alcohol resin film are oriented), or may be a laminate film in which two or more layers in which a polyvinyl alcohol resin layer in which a dichroic dye is adsorbed and oriented is provided on a base film. Such a polarizing layer may be manufactured using various methods known in the art.

(polarizing plate)

The polarization function layer may be a polarizing plate. Typically, a polarizing plate is one in which a protective layer (protective film) is attached to one or both surfaces of a polarizing layer in which a dichroic dye is adsorbed and oriented to a polyvinyl alcohol resin film. As the protective layer, for example, a protective layer formed of a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like can be used. Specifically, there may be mentioned: polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; a polystyrene-based resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide-based resin; a polyether ketone resin; polyphenylene sulfide-based resin; polyphenylene ether resins, and mixtures and copolymers thereof. Among these resins, any of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth) acrylic resins, or a mixture thereof is preferably used. The "(meth) acrylic acid" means "at least 1 kind of acrylic acid and methacrylic acid".

The protective layer may be a single layer obtained by mixing 1 or 2 or more kinds of resin materials, or may have a multilayer structure of 2 or more layers. In the case of having a multilayer structure, the resins constituting the respective layers may be the same or different from each other. In the case where the protective layer is a film formed of a resin material, an arbitrary additive may be added to the protective layer. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.

The thickness of the polarizing layer in which the dichroic dye is adsorbed and oriented in the polyvinyl alcohol resin film is preferably 20 μm or less, and more preferably 10 μm or less.

The polarizing function layer included in the circularly polarizing plate of the present invention is particularly preferably a polarizing function layer in which a protective layer is laminated only on one surface of a polarizing layer (hereinafter referred to as "one-surface protective polarizing plate"). As described above, the first liquid crystal layer and the second liquid crystal layer are liquid crystal layers formed of polymerizable liquid crystal compounds and are extremely thin liquid crystal layers. If the linear polarizing plate is a single-sided protective polarizing plate, the thickness thereof is thin, and as a result, the thickness of the circular polarizing plate of the present invention can be reduced. Therefore, for example, when the organic EL display device including the circularly polarizing plate of the present invention is a flexible organic EL display device which can be bent or rolled, it is extremely advantageous that the bending or rolling is not easily affected. The thickness of the protective layer in the one-sided protective polarizing plate may be optimized according to the thickness of the polarizing layer itself, and in order to ensure good flexibility of the circularly polarizing plate of the present invention, the thickness is preferably 50 μm or less, and more preferably 30 μm or less.

As the one-sided protective polarizing plate, for example, one disclosed in JP2016-122025 a and the like can be used.

As described above, the polarizing layer included in the polarizing function layer of the circularly polarizing plate of the present invention may be a cured film obtained by aligning a dichroic dye with a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. The polarizing layer in this case can be generally obtained by applying a composition containing a polymerizable liquid crystal compound and a dichroic dye onto a base layer or an alignment layer provided on the base layer, drying the composition, and then polymerizing and curing the polymerizable liquid crystal compound contained in the applied film by irradiation with active energy rays such as ultraviolet rays. The laminate of the substrate and the polarizing layer (cured film) obtained in this way can be used as a single-sided protective polarizing plate.

The thickness of the substrate layer for forming the cured film is not particularly limited, but is generally preferably 1 to 300 μm, more preferably 10 to 200 μm, and still more preferably 30 to 120 μm in view of strength, handling properties, and the like.

(first substrate layer and second substrate layer)

The first base material layer and the second base material layer (hereinafter, both may be collectively referred to as "base material layers") are preferably films made of resin materials. The resin material is also the same as the material forming the protective film of the polarizing plate, and for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like can be used. As a typical example and a preferable example of the resin material, a resin material exemplified as a protective layer of a polarizing plate can be used.

The base layer may be a single layer obtained by mixing 1 or 2 or more kinds of resin materials, or may have a multilayer structure having 2 or more layers. In the case of having a multilayer structure, the resin materials constituting the respective layers may be the same or different from each other. When the base layer is a film made of a resin material, any additive may be added to the base layer. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.

The thickness of the substrate layer for forming the liquid crystal layer is not particularly limited, but is generally preferably 1 to 300 μm, more preferably 10 to 200 μm, and still more preferably 30 to 120 μm in view of workability such as strength and handling property.

(first alignment layer and second alignment layer)

The first alignment layer and the second alignment layer (hereinafter, both may be collectively referred to as "alignment layers") that the circularly polarizing plate may include have an alignment controlling force that liquid-crystal aligns a polymerizable liquid crystal compound included in a liquid crystal layer formed thereon 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 a concave-convex pattern or a plurality of grooves (grooves) on the surface of the layer. The thickness of the alignment layer is usually 10 to 500nm, preferably 10 to 200 nm.

The alignment polymer layer can be formed by applying a composition in which an alignment polymer is dissolved in a solvent to a base material layer, removing the solvent, and, if necessary, subjecting the composition to a rubbing treatment. In this case, the orientation controlling force of the oriented polymer layer formed of the oriented polymer can be arbitrarily adjusted by utilizing the surface state of the oriented polymer or the rubbing condition.

The photo-alignment polymer layer may be formed by coating a composition including a polymer or monomer having a photoreactive group and a solvent on a base material layer and irradiating polarized light. In this case, the photo-alignment polymer layer can be arbitrarily adjusted in alignment control force by using the polarized light irradiation conditions for the photo-alignment polymer.

The trench alignment layer may be formed using, for example, the following method: a method of forming a concave-convex pattern by exposing and developing the surface of a photosensitive polyimide film through an exposure mask having a slit with a pattern shape; a method of forming an uncured layer of an active energy ray-curable resin on a plate-like master having grooves on the surface thereof, and then transferring the layer to a base material layer to cure the layer; a method of forming an uncured layer of an active energy ray-curable resin on a base layer, and pressing a roll-shaped master having irregularities against the layer or the like to form irregularities and cure the irregularities.

(first liquid Crystal layer and second liquid Crystal layer)

The first liquid crystal layer and the second liquid crystal layer (hereinafter, both may be collectively referred to as "liquid crystal layers") are both formed using a polymerizable liquid crystal compound, and a known polymerizable liquid crystal compound can be used as the polymerizable liquid crystal compound. The type of the polymerizable liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. Here, the polymerizable liquid crystal compound used to form the 1/4 wave plate having the reverse wavelength dispersibility is preferably a rod-like liquid crystal compound, for example, the polymerizable liquid crystal compound described in japanese patent application laid-open publication No. 2011-207765. When such a polymerizable liquid crystal compound is used, a liquid crystal layer as a liquid crystal cured layer can be formed by applying a liquid crystal layer-forming composition containing the polymerizable liquid crystal compound, a solvent, and, if necessary, various additives onto an alignment layer to form a coating film, and curing the coating film. Alternatively, the liquid crystal layer can be formed by applying the composition for forming a liquid crystal layer on the base layer to form a coating film and stretching the coating film together with the base layer. The liquid crystal layer may be a phase difference layer.

The composition for forming a liquid crystal layer may contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, and the like in addition to the polymerizable liquid crystal compound and the solvent. Known materials such as a polymerizable liquid crystal compound, a solvent, a polymerization initiator, a reactive additive, a leveling agent, and a polymerization inhibitor can be used as appropriate. Examples of the leveling agent that can be contained in the liquid crystal layer-forming composition and the liquid crystal layer include a leveling agent containing an organic modified silicone oil as a main component, a leveling agent containing a polyacrylate compound as a main component, and a leveling agent containing a fluorine atom-containing compound such as perfluoroalkane as a main component. The main component herein refers to a component having the largest amount of all components contained in the leveling agent. As the leveling agent, among the above, a leveling agent containing a polyacrylate compound as a main component and a leveling agent containing a fluorine atom-containing compound such as perfluoroalkane as a main component are preferably used. The content of the leveling agent in the composition for forming a liquid crystal layer is preferably 0.01 to 5 parts by mass, and more preferably 0.1 to 3 parts by mass, based on 100 parts by mass of the polymerizable liquid crystal compound.

As described above, in the circularly polarizing plate of the present invention, the first liquid crystal layer preferably contains a leveling agent, and therefore, the liquid crystal layer forming composition for forming the first liquid crystal layer is preferably a liquid crystal layer forming composition containing a leveling agent.

(adhesive layer)

The adhesive layer is provided between the first liquid crystal layer and the second liquid crystal layer, and is used for bonding these 2 liquid crystal layers. The adhesive layer may be in direct contact with the first liquid crystal layer and the second liquid crystal layer, or may be in direct contact with a first alignment layer provided on the first liquid crystal layer and a second alignment layer provided on the second liquid crystal layer.

The adhesive layer may be formed of an adhesive, a pressure-sensitive adhesive, or a combination thereof, and may be generally 1 layer or 2 or more layers. When the adhesive layer includes 2 or more layers, the layers may be formed of the same material or different materials.

The adhesive may be formed by combining 1 or 2 or more kinds of water-based adhesives, active energy ray-curable adhesives, pressure-sensitive adhesives, and the like. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution and an aqueous two-pack polyurethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet light, and examples thereof include an active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator, an active energy ray-curable adhesive containing a photoreactive resin, and an active energy ray-curable adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include: photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable polyurethane monomers; oligomers derived from these monomers, and the like. Examples of the photopolymerization initiator include photopolymerization initiators containing active species that generate neutral radicals, anionic radicals, and cationic radicals by irradiation with active energy rays such as ultraviolet rays.

Examples of the binder include a composition containing a base polymer such as a (meth) acrylic resin, a styrene resin, or a silicone resin and a crosslinking agent such as an isocyanate compound, an epoxy compound, or an aziridine compound.

The adhesive layer is preferably formed using an active energy ray-curable adhesive, and particularly preferably formed using an adhesive containing an ultraviolet-curable epoxy monomer and a photo cation polymerization initiator.

The surface of the layer to be formed with the adhesive layer may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, or the like as necessary.

The adhesive layer is preferably an adhesive cured layer. In this case, the adhesive composition layer is preferably formed using an adhesive, and the adhesive is preferably an active energy ray-curable adhesive such as an ultraviolet-curable adhesive. By using the adhesive layer as the adhesive cured layer, generation of wrinkles between the first liquid crystal layer and the second liquid crystal layer can be easily suppressed even when the circularly polarizing plate is bent or wound along with bending or winding of the flexible organic EL display device, for example, when the circularly polarizing plate is applied to the flexible organic EL display device.

Although the adhesive and the pressure-sensitive adhesive for forming the adhesive layer have been described above, in the circularly polarizing plate of the present invention, the adhesive layer for bonding the first liquid crystal layer and the second liquid crystal layer is preferably an adhesive cured layer formed using an adhesive.

(adhesive layer for polarizing plate)

The polarizing plate adhesive layer may be formed of an adhesive, a pressure-sensitive adhesive, or a combination thereof, and may be generally 1 layer or 2 or more layers. When the adhesive layer for a polarizing plate includes 2 or more layers, the layers may be formed of the same material or different materials. Examples of the adhesive and the pressure-sensitive adhesive used for forming the adhesive layer for a polarizing plate include the same adhesives and pressure-sensitive adhesives as those used for the adhesive layer. The surface of the layer on which the adhesive layer for a polarizing plate is to be formed may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, or the like as necessary.

(adhesive composition layer for optical element)

The adhesive composition layer for optical elements may be formed of an adhesive, a pressure-sensitive adhesive, or a combination thereof, and may be generally 1 layer or 2 or more layers. When the adhesive composition layer for an optical element includes 2 or more layers, the layers may be formed of the same material or different materials. Examples of the adhesive and the binder constituting the adhesive composition layer for an optical element include the same adhesives and binders as those used for the adhesive layer. The adhesive composition layer for optical elements is preferably formed using an adhesive. The surface of the layer on which the adhesive composition layer for an optical element is to be formed may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, or the like as necessary. The adhesive composition layer for an optical element is preferably an adhesive layer formed using an adhesive.

Examples

The present invention will be described more specifically below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the examples, "%" and "part(s)" are% by mass and part(s) by mass unless otherwise specified.

[ preparation of adhesive composition ]

The photocurable adhesive composition was prepared by mixing the following cationically curable components a1 to a3 and a cationic polymerization initiator, and then mixing the following cationic polymerization initiator and a sensitizer, followed by defoaming. The following compounding amounts are based on the solid content.

Cationic curable component a1(70 parts):

3 ', 4' -epoxycyclohexylmethyl-3 ', 4' -epoxycyclohexanecarboxylate (trade name: CEL2021P, a product of Dailuo Kagaku Co., Ltd.)

Cationic curable component a2(20 parts):

neopentyl glycol diglycidyl ether (trade name: EX-211, manufactured by Nagase ChemteX)

Cationic curable component a3(10 parts):

2-ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase ChemteX)

Cationic polymerization initiator (2.25 parts (amount of solid component)):

trade name: CPI-100 (manufactured by San-Apro Co., Ltd.) in 50% propylene carbonate solution

Sensitizer (2 parts):

1, 4-diethoxynaphthalenes

[ comparative example 1 ]

(preparation of composition for Forming photo-alignment layer)

The following components were mixed, and the resulting mixture was stirred at a temperature of 80 ℃ for 1 hour, thereby obtaining a composition for forming a photo-alignment layer.

Photo-alignment material (5 parts):

solvent (95 parts): cyclopentanone

(preparation of composition (A) for Forming liquid Crystal layer)

The following components were mixed, and the resulting mixture was stirred at 80 ℃ for 1 hour, thereby obtaining a composition (a) for forming a liquid crystal layer. The polymerizable liquid crystal compound a1 can be synthesized by the method for synthesizing the compound (a11-1) described in japanese patent application laid-open publication No. 2011-207765. The polymerizable liquid crystal compound A2 can be synthesized by the method for synthesizing the compound (x-1) described in Japanese patent application laid-open No. 2010-31223.

Polymerizable liquid crystal compound a1(80 parts):

polymerizable liquid crystal compound a2(20 parts):

polymerization initiator (6 parts):

2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one (Irgacure 369; product of Ciba Specialty Chemicals)

Leveling agent (0.1 part):

polyacrylate Compound (BYK-361N; manufactured by BYK-Chemie Co., Ltd.)

Solvent (400 parts): cyclopentanone

(production of polarizing plate)

A polarizing plate (single-sided protective polarizing plate) with a protective film laminated on one side thereof was produced by the method described in the example of jp 2016 a-122025 a.

(production of first liquid Crystal layer with substrate layer (1))

A polyethylene terephthalate (PET) film having a thickness of 100 μm was used as a base material layer, and the PET film was treated 1 time with a corona treatment apparatus (AGF-B10, manufactured by Chunshi electric motors Co., Ltd.) under conditions of an output of 0.3kW and a treatment speed of 3 m/min. The corona-treated surface was coated with the composition for forming a photo-alignment layer by using a bar coater, dried at 80 ℃ for 1 minute, and irradiated with polarized UV light (SPOT CURE SP-7; manufactured by USHIO MOTOR K.K.) at a rate of 100mJ/cm ² The accumulated light amount of (2) was subjected to polarized UV exposure to obtain a photo-alignment layer. The thickness of the obtained photo-alignment layer was measured by a laser microscope (LEXT, manufactured by Olympus corporation), and it was 100 nm.

Next, the liquid was coated on the photo-alignment layer using a bar coaterThe composition (A) for forming a crystal layer was dried at 120 ℃ for 1 minute, and then irradiated with ultraviolet light (wavelength: 365nm, cumulative amount of light at wavelength 365 nm: 1000mJ/cm under nitrogen atmosphere) using a high-pressure mercury lamp (Unicure VB-15201BY-A, USHIO Motor Co., Ltd.) ² ) Thereby, a liquid crystal layer as a retardation layer is formed, and a first liquid crystal layer (1) with a substrate layer is obtained. The thickness of the liquid crystal layer was 2 μm.

With respect to the obtained first liquid crystal layer (1) with the substrate layer, the above adhesive composition was applied to the side of the liquid crystal layer opposite to the substrate layer, and the coated side was visually observed, and as a result, craters were observed.

It is thus assumed that: when a one-side protective polarizing plate is bonded via an adhesive layer (adhesive composition on the first liquid crystal layer (1)) in which craters are observed, the resulting circularly polarizing plate is observed to have an appearance abnormality due to the craters.

[ example 1 ]

The first liquid crystal layer (1) with a substrate layer was obtained by the same procedure as in comparative example 1. The liquid crystal layer side of the first liquid crystal layer (1) with the substrate layer thus obtained was bonded to a glass substrate (alkali-free glass "Eagle XG" manufactured by Corning corporation, thickness: 0.2 mm) via a sheet-like adhesive (manufactured by LINTEC corporation, "NCF # L2") having a thickness of 5 μm, and then the substrate layer was peeled off to obtain a liquid crystal layer with a glass substrate. Only the base material layer was peeled off, and the photo-alignment layer remained without being peeled off. When the above adhesive composition was applied to the release surface of the liquid crystal layer with a glass substrate and the applied surface was visually observed, the shrinkage of the coated surface was less than that observed in comparative example 1 in which the adhesive composition was applied to the liquid crystal layer side of the first liquid crystal layer (1) with a base layer.

As described above, when the adhesive composition layer is provided on the release surface of the first liquid crystal layer (1) after the base layer is released, and the polarizing function layer (for example, a one-sided protective polarizing plate) is bonded to the adhesive composition layer, a circularly polarizing plate having excellent appearance can be obtained.

From the results of example 1 and comparative example 1, it is considered that: since the surface exposed by peeling the base material layer from the first liquid crystal layer (1) with the base material layer has less shrinkage cavities, the affinity to the adhesive composition is high, and the adhesive composition layer has excellent adhesion force when formed.

Comparative example 2

(preparation of composition for Forming alignment layer)

2-butoxyethanol was added to Sun SE-610 (manufactured by Nissan chemical industries, Ltd.) which is a commercially available alignment polymer to obtain a composition for forming an alignment layer. In the obtained composition for forming an alignment layer, the content ratio of the solid content to the total amount of the composition was 1%, and the content ratio of the solvent to the total amount of the composition was 99%. The amount of solid component in the Sun SE-610 was converted from the concentration described in the delivery specification.

(preparation of composition (B) for liquid Crystal layer formation)

The following components were mixed, and the resulting mixture was stirred at 80 ℃ for 1 hour and then cooled to room temperature to obtain a composition (B) for forming a liquid crystal layer.

Polymerizable liquid crystal compound LC242 (manufactured by BASF) (19.2%):

polymerization initiator (0.5%):

irgacure (registered trademark) 907 (manufactured by BASF JAPAN Co., Ltd.)

Leveling agent (0.1%):

BYK361N (BYK-CHEMIE JAPAN system)

Reaction additive (1.1%):

laromer (registered trademark) LR-9000 (manufactured by BASF JAPAN Co., Ltd.)

Solvent (79.1%): propylene glycol 1-monomethyl ether-2-acetate

A polyethylene terephthalate (PET) film having a thickness of 38 μm was treated 1 time at a treatment speed of 3 m/min and an output of 0.3kW using a corona treatment apparatus (AGF-B10, manufactured by Chunshi electric Co., Ltd.). The corona-treated surface was coated with the alignment layer-forming composition using a bar coater, and dried at 90 ℃ for 1 minute to obtain an alignment layer. The thickness of the obtained alignment layer was measured with a laser microscope (LEXT, manufactured by Olympus corporation), and found to be 34 nm.

Next, the liquid crystal layer-forming composition (B) was applied onto the alignment layer using a bar coater, and after drying at 90 ℃ for 1 minute, ultraviolet rays (wavelength: 365nm, cumulative amount of light at wavelength 365nm under nitrogen atmosphere: 1000 mJ/cm) were irradiated using a high-pressure mercury lamp (manufactured BY Unicure VB-15201BY-A, USHIO Motor Co., Ltd.) ² ) Thereby forming a liquid crystal layer as a retardation layer, and obtaining a first liquid crystal layer (2) with a substrate layer. The thickness of the liquid crystal layer was 1 μm.

The first liquid crystal layer (2) with the substrate layer was coated with the adhesive composition on the side of the liquid crystal layer opposite to the substrate layer, and the coated surface was visually observed, and as a result, craters were observed.

It is thus assumed that: when a one-side protective polarizing plate is bonded via an adhesive layer (adhesive composition on the first liquid crystal layer (2)) in which craters are observed, the resulting circularly polarizing plate is observed to have an appearance abnormality due to the craters.

[ example 2 ]

The first liquid crystal layer (2) with a substrate layer was obtained by the same procedure as in comparative example 2. The liquid crystal layer side of the first liquid crystal layer (2) with the substrate layer thus obtained was bonded to a glass substrate (alkali-free glass "Eagle XG" manufactured by Corning corporation, thickness: 0.2 mm) via a sheet-like adhesive (manufactured by LINTEC corporation, "NCF # L2") having a thickness of 5 μm, and then the substrate layer was peeled off to obtain a liquid crystal layer with a glass substrate. The alignment layer was peeled off simultaneously with the peeling of the base material layer. The coated surface on which the adhesive composition was coated on the release side of the substrate layer of the liquid crystal layer in the liquid crystal layer with glass substrate was visually observed, and as a result, the shrinkage cavity was less compared with the coated surface on which the adhesive composition was coated on the liquid crystal layer side of the first liquid crystal layer (2) with substrate layer observed in comparative example 2.

As described above, if an adhesive composition layer is provided on the release surface of the first liquid crystal layer (2) after the base layer is released, and a polarizing function layer (for example, a one-sided protective polarizing plate) is further bonded to the adhesive composition layer, a circularly polarizing plate having excellent appearance can be obtained.

From the results of example 2 and comparative example 2, it is considered that: since the surface exposed by peeling the base material layer from the first liquid crystal layer (2) with the base material layer has less shrinkage cavities, the affinity to the adhesive composition is high, and the adhesive composition layer has excellent adhesion force when formed.

Claims

1. A method for manufacturing a circularly polarizing plate comprising a polarization function layer including at least a linear polarization layer, an adhesive layer for the polarization function layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer in this order, the method comprising:

preparing a layer including a liquid crystal layer with a first base material layer, the layer including the liquid crystal layer with the first base material layer having the adhesive layer, the second liquid crystal layer, and the second base material layer in this order on the first liquid crystal layer side of the first liquid crystal layer with the base material layer having the first base material layer and the first liquid crystal layer;

a step of peeling the first base material layer from the layer containing the liquid crystal layer with the first base material layer to form an exposed surface on the first base material layer side of the first liquid crystal layer;

the first liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on the first base material layer,

2. A method for manufacturing a circularly polarizing plate comprising a polarization functional layer including at least a linear polarization layer, an adhesive layer for the polarization functional layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer in this order, the method comprising:

a step of preparing a layer including a liquid crystal layer with a second base material layer, the layer including the liquid crystal layer with the second base material layer including the polarization function layer, the adhesion layer for the polarization function layer, and a first liquid crystal layer with a base material layer including the first liquid crystal layer and the first base material layer in this order from the adhesion layer side for the polarization function layer;

A step of peeling the first base material layer from the layer containing the liquid crystal layer with the second base material layer to form an exposed surface on the first base material layer side of the first liquid crystal layer;

a step of bonding the second liquid crystal layer side of a second liquid crystal layer with a substrate layer, which has a second substrate layer and the second liquid crystal layer, to the adhesive composition layer containing the layer including the liquid crystal layer with the second composition layer,

3. The method of manufacturing a circularly polarizing plate according to claim 2, wherein the step of preparing a layer including a liquid crystal layer with a second base material layer includes:

A step of preparing a polarization functional layer with a composition layer, wherein an adhesive composition layer for a polarization functional layer for forming the adhesive layer for a polarization functional layer is provided on the polarization functional layer; and

and a step of bonding the first liquid crystal layer side of the first liquid crystal layer with the substrate layer to the adhesive composition layer for a polarization function layer of the polarization function layer with the composition layer.

4. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3, wherein the first liquid crystal layer having a substrate layer comprises a first alignment layer between the first liquid crystal layer and the first substrate layer,

5. The method of manufacturing a circularly polarizing plate according to claim 1, wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer between the first liquid crystal layer and the first substrate layer,

6. The method of manufacturing a circularly polarizing plate according to claim 2 or 3, wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer between the first liquid crystal layer and the first substrate layer,

The layer containing the liquid crystal layer with the second composition layer has the first alignment layer between the first liquid crystal layer and the adhesive composition layer.

7. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the first liquid crystal layer contains a leveling agent.

8. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the adhesive layer is an adhesive cured layer or an adhesive layer.

9. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the adhesive layer is a cured adhesive layer,

10. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the first liquid crystal layer is an 1/2 wave plate, and the second liquid crystal layer is a 1/4 wave plate.

11. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the first liquid crystal layer is an 1/4 wave plate having reverse wavelength dispersibility, and the second liquid crystal layer is a positive C plate.

12. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the adhesive layer for a polarizing function layer is an adhesive cured layer or an adhesive layer.

13. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the second liquid crystal layer is a liquid crystal layer obtained by polymerizing a polymerizable liquid crystal compound on the second substrate layer.

14. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, which comprises a step of peeling off the second base material layer after the step of bonding.

15. The method for manufacturing a circularly polarizing plate according to any one of claims 1 to 3 and 5, wherein the polarizing function layer is a polarizing plate including a protective layer on at least one surface of the linear polarizing layer.