TWI869345B - Manufacturing method of circularly polarizing plate - Google Patents

Abstract

Provided is a manufacturing method of circularly polarizing plate including a polarizing functional layer including at least a linear polarizing layer, an adhesive layer for polarizing functional layer, a 1st liquid crystal layer, an adhesive layer, and a 2nd liquid crystal layer in this order; the manufacturing method including the following steps: a step of preparing a 1st liquid crystal layer-with base material layer-containing layer having the adhesive layer, the 2nd liquid crystal layer, and a 2nd base material layer provided in this order on a 1st liquid crystal layer side of a 1st liquid crystal layer with base material layer having the 1st base material layer and the 1st liquid crystal layer; the process of peeling the base material layer from the 1st liquid crystal layer-with base material layer-containing layer, and forming an exposed surface in the base material layer side of the 1st liquid crystal layer; obtaining a 1st liquid crystal layer-with composition layer-containing layer provided with an adhesive composition layer for polarizing functional layer for forming an adhesive layer for the polarizing functional layer on the exposed surface; and a step of bonding the adhesive composition layer for polarizing functional layer of the 1st liquid crystal layer- with composition layer-containing layer and the polarizing functional layer. The 1st liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on the 1st base material layer.

Description

Manufacturing method of circular polarizing plate

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

In display devices such as organic EL display devices and liquid crystal display devices, components including optical anisotropic films such as polarizing films and phase difference films are used. In particular, in organic EL display devices, due to the external light reflection caused by the metal electrode, the visibility is easily reduced. Therefore, in order to prevent the external light reflection, a component called a circular polarizing plate is used, which is a combination of a polarizing film and an optical anisotropic film. As for the optical anisotropic film used in the circular polarizing plate, it is known that a liquid crystal compound layer is formed on a substrate film. For example, JP2014-222282 describes the use of liquid crystal materials in the phase difference layer of an optical film used in a circular polarizing plate, etc.

Since the circular polarizing plate is usually installed on the viewing side of the organic EL display panel, when the circular polarizing plate has appearance abnormalities such as wrinkles, bubbles, and unevenness, the visibility of the organic EL display device is likely to decrease.

The purpose of the present invention is to provide a method for manufacturing a circular polarizing plate, which is suitable for forming a circular polarizing plate with a liquid crystal layer.

The present invention provides a method for manufacturing a circular polarizing plate as disclosed below.

[1] A method for manufacturing a circular polarizing plate, the circular polarizing plate sequentially comprising a polarizing functional layer including at least a linear polarizing layer, a bonding layer for the polarizing functional layer, a first liquid crystal layer, a bonding layer, and a second liquid crystal layer, the manufacturing method comprising the following steps: preparing a first layer including a liquid crystal layer attached to a substrate layer, the first layer including a liquid crystal layer attached to a substrate layer being formed on a substrate layer having a first substrate layer and a bonding layer The first liquid crystal layer of the first liquid crystal layer attached to the substrate layer has the aforementioned bonding layer, the aforementioned second liquid crystal layer, and the second substrate layer in order on the first liquid crystal layer side; the step of peeling the aforementioned first substrate layer from the aforementioned first liquid crystal layer containing the substrate layer attached to form an exposed surface on the aforementioned first substrate layer side of the aforementioned first liquid crystal layer; the step of obtaining the first liquid crystal layer containing the component layer attached to the substrate layer The first layer of the liquid crystal layer with the attached component layer is provided with a polarizing functional layer connecting component layer on the exposed surface thereof; and the polarizing functional layer is bonded to the polarizing functional layer connecting component layer of the first layer of the liquid crystal layer with the attached component layer; wherein the first liquid crystal layer is made of a polymerizable liquid crystal compound. The first liquid crystal layer and the second liquid crystal layer obtained by polymerization on the first substrate layer satisfy the following relationship [a] or [b]: [a] the first liquid crystal layer is a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate, [b] one of the first liquid crystal layer and the second liquid crystal layer is a reverse wavelength dispersion 1/4 wavelength plate, and the other is a positive C plate.

[2] A method for manufacturing a circular polarizing plate, the circular polarizing plate comprising, in sequence, a polarizing functional layer including at least a linear polarizing layer, a bonding layer for the polarizing functional layer, a first liquid crystal layer, a bonding layer, and a second liquid crystal layer, the manufacturing method comprising the following steps: preparing a second liquid crystal layer including a substrate layer, the second liquid crystal layer including a substrate layer having, in sequence, the polarizing functional layer; The method comprises the steps of: providing a first liquid crystal layer, a bonding layer for the polarizing functional layer, and a first liquid crystal layer having the first liquid crystal layer and the first substrate layer attached to the bonding layer in order from the side of the bonding layer for the polarizing functional layer; peeling the first substrate layer from the second layer containing the liquid crystal layer attached to the substrate layer to form an exposed surface on the side of the first substrate layer of the first liquid crystal layer; and providing a useful The step of forming a second layer containing a liquid crystal layer attached to the component layer attached to the aforementioned bonding layer; and the step of attaching the second liquid crystal layer side of the second liquid crystal layer attached to the substrate layer having a second substrate layer and the aforementioned second liquid crystal layer to the aforementioned bonding layer of the second layer containing a liquid crystal layer attached to the component layer; wherein the aforementioned first liquid crystal layer is a polymerizable liquid crystal compound 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 a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate; [b] one of the first liquid crystal layer and the second liquid crystal layer is a reverse wavelength dispersion 1/4 wavelength plate, and the other is a positive C plate.

[3] The method for manufacturing a circular polarizing plate as described in [2], wherein the step of preparing the second layer containing the liquid crystal layer attached to the substrate layer comprises the following steps: preparing a polarizing functional layer attached to the component layer, which is provided on the polarizing functional layer to form a polarizing functional layer attaching layer; and bonding the first liquid crystal layer side of the first liquid crystal layer attached to the substrate layer to the polarizing functional layer attaching component layer of the polarizing functional layer attached to the component layer.

[4] The method for manufacturing a circularly polarizing plate as described in any one of items [1] to [3], wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer located between the first liquid crystal layer and the first substrate layer, and the step of forming the exposed surface comprises peeling the first alignment layer together with the first substrate layer.

[5] The method for manufacturing a circularly polarizing plate as described in [1], wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer located between the first liquid crystal layer and the first substrate layer, and the first layer containing a liquid crystal layer with a component layer comprises the first alignment layer between the first liquid crystal layer and the component layer for connecting the polarizing functional layer.

[6] The method for manufacturing a circularly polarizing plate as described in [2] or [3], wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer located between the first liquid crystal layer and the first substrate layer, and the second layer containing a liquid crystal layer with a component layer comprises the first alignment layer between the first liquid crystal layer and the adjacent component layer.

[7] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [6], wherein the first liquid crystal layer contains a leveling agent.

[8] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [7], wherein the bonding layer is a bonding agent curing layer or a pressure-sensitive adhesive layer.

[9] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [8], wherein the bonding layer is an adhesive curing layer, and the bonding composition layer used to form the bonding layer contains an active energy ray curing type adhesive.

[10] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [9], wherein the first liquid crystal layer is a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate.

[11] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [9], wherein the first liquid crystal layer is a 1/4 wavelength plate with reverse wavelength dispersion, and the second liquid crystal layer is a positive C plate.

[12] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [11], wherein the bonding layer for the polarizing functional layer is a bonding agent curing layer or an adhesive layer.

[13] A method for producing a circularly polarizing plate as described in any one of items [1] to [12], wherein the second liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on the second substrate layer.

[14] A method for manufacturing a circularly polarizing plate as described in any one of items [1] to [13], which comprises a step of peeling off the second substrate layer after the bonding step.

[15] A method for manufacturing a circular polarizing plate as described in any one of items [1] to [14], wherein the polarizing functional layer is a polarizing plate including a protective layer on at least one side of the linear polarizing layer.

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

10: The first liquid crystal layer with substrate layer

11: 1st base material layer

12: 1st liquid crystal layer

20: Second liquid crystal layer with substrate layer

21: Second base material layer

22: Second liquid crystal layer

30: Next layer

30a: Next, the composition layer

31: Adhesive layer for polarizing plate (adhesive layer for polarizing functional layer)

31a: Polarizing plate and subsequent component layer (polarizing functional layer and subsequent component layer)

34: Next layer

35: Optical elements are used to form material layers

36: Adhesive layer for polarizing plate (adhesive layer for polarizing functional layer)

36a: Polarizing plate followed by component layer (polarizing functional layer followed by component layer)

41: A layer containing a liquid crystal layer attached to a substrate layer (a second layer containing a liquid crystal layer attached to a substrate layer)

42: Layer containing liquid crystal layer

43: A layer containing a liquid crystal layer attached to a component layer (a second layer containing a liquid crystal layer attached to a component layer)

46: A layer containing a liquid crystal layer attached to a substrate layer (a first layer containing a liquid crystal layer attached to a substrate layer)

47: Layer containing liquid crystal layer

48: A layer containing a liquid crystal layer attached to a component layer (a first layer containing a liquid crystal layer attached to a component layer)

51: Circular polarizing plate with substrate layer (circular polarizing plate)

52: Circular polarizing plate

53: Circular polarizing plate with component layer attached (circular polarizing plate)

56: Circular polarizing plate with substrate layer (circular polarizing plate)

57: Circular polarizing plate

58: Circular polarizing plate with component layer attached (circular polarizing plate)

60: Polarizing plate (polarizing functional layer)

61: Polarizing plate with component layer attached (polarizing functional layer with component layer attached)

W: width direction

Figure 1 (a) to (e) are schematic cross-sectional views showing an example of the manufacturing steps of the circular polarizing plate of the present invention.

Figure 2 (a) to (c) are schematic cross-sectional views showing subsequent steps of manufacturing the circular polarizing plate shown in Figure 1.

Figure 3 (a) to (c) are schematic cross-sectional views showing subsequent steps of manufacturing the circular polarizing plate of Figure 2.

Figure 4 (a) to (d) are schematic cross-sectional views showing other examples of the manufacturing steps of the circular polarizing plate of the present invention.

Figure 5 (a) to (c) are schematic cross-sectional views showing subsequent steps of manufacturing the circular polarizing plate shown in Figure 4.

The circular polarizing plate manufactured according to the manufacturing method of the circular polarizing plate of the present invention comprises, in order, a polarizing functional layer including at least a linear polarizing layer, a bonding layer for the polarizing functional layer, a first liquid crystal layer, a bonding layer, and a second liquid crystal layer. In the circular polarizing plate, the first liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on a first substrate layer. Furthermore, the first liquid crystal layer and the second liquid crystal layer in the circular polarizing plate satisfy the following relationship [a] or [b]: [a] the first liquid crystal layer is a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate, [b] one of the first liquid crystal layer and the second liquid crystal layer is a reverse wavelength dispersion 1/4 wavelength plate, and the other is a positive C plate.

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

The circular polarizer can be made very thin, so it is useful for flexible organic EL display devices that can be bent or rolled up, such as the next generation of organic EL display devices. In the following, the linear polarizer may be referred to as a "polarizer", and a linear polarizer having a protective layer formed on at least one side of the linear polarizer may be referred to as a "polarizer".

Hereinafter, the preferred embodiment of the method for manufacturing a circular polarizing plate of the present invention will be described with reference to the drawings. Furthermore, the embodiments and their variations shown below can be combined arbitrarily. Furthermore, in each embodiment and its variations, for the same components as those described in the embodiments or their variations before the embodiments and their variations, the same symbols are added and their descriptions are omitted.

[Implementation form 1]

Figures 1 to 3 are schematic cross-sectional views schematically showing an example (implementation form 1) of the manufacturing steps of the circular polarizing plate of the present invention. In the figure, W represents the width direction. The circular polarizing plate 52 obtained according to the manufacturing method of the present invention is as shown in Figure 3 (b), and sequentially includes a polarizing plate 60 (polarizing functional layer) having a protective layer formed on at least one side of the polarizing layer, a polarizing plate bonding layer 36 (polarizing functional layer bonding layer), a first liquid crystal layer 12, a bonding layer 30, and a second liquid crystal layer 22. The circular polarizer obtained by the manufacturing method of the present invention is shown in FIG. 3 (a) and FIG. 3 (c), and may include a second substrate layer 21 or an optical element bonding composition layer 35 on the side opposite to the bonding layer 30 of the second liquid crystal layer 22. As described later, the first liquid crystal layer 12 preferably contains a leveling agent.

In the manufacturing method of the circular polarizing plate 52 shown in FIG. 3 (b), firstly, a step of preparing a polarizing plate 61 (polarizing functional layer attached to a component layer) having a polarizing plate attaching component layer 36a (polarizing functional layer attaching component layer) formed on one side of a polarizing plate 60 is performed (FIG. 1 (a)); a step of preparing a first substrate layer attached to a first liquid crystal layer 10 having a first liquid crystal layer 12 laminated on a first substrate layer 11 (FIG. 1 (b)); and a step of preparing a second substrate layer attached to a second liquid crystal layer 20 having a second liquid crystal layer 22 laminated on a second substrate layer 21 (FIG. 1 (c)).

Regarding the step of preparing the polarizing plate 61 with the component layer attached, when the polarizing plate bonding layer 36 of the circular polarizing plate 52 is an adhesive curing layer, there may be a step of applying the adhesive on one side of the polarizing plate 60, and there may also be a step of drying the applied adhesive as needed. In addition, regarding the step of preparing the polarizing plate 61 with the component layer attached, when the polarizing plate bonding layer 36 of the circular polarizing plate 52 is an adhesive layer, there may be a step of applying an adhesive on one side of the polarizing plate 60 and a step of drying the applied adhesive as needed, or there may be a step of forming an adhesive layer on the release-treated surface of a release film and transferring the adhesive layer of the release film to the polarizing plate 60.

Regarding the step of preparing the first liquid crystal layer 10 attached to the substrate layer, it is sufficient if the first liquid crystal layer 10 attached to the 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, or there 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. When polymerizing the polymerizable liquid crystal compound on the first substrate layer 11, a liquid crystal layer forming composition containing the polymerizable liquid crystal compound may be applied on the first substrate layer 11 and after drying, the polymerizable liquid crystal compound may be polymerized to form the first liquid crystal layer 12. The liquid crystal layer forming composition may contain a solvent, a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, etc. in addition to the polymerizable liquid crystal compound. In particular, in the present invention, when the composition for forming the liquid crystal layer contains a leveling agent (when the first liquid crystal layer contains a leveling agent), a more significant effect will be achieved. Similarly, the step of preparing the second liquid crystal layer 20 with a substrate layer may include a step of polymerizing the polymerizable liquid crystal compound on the second substrate layer 21 to form the second liquid crystal layer 22, or the composition for forming the liquid crystal layer containing the polymerizable liquid crystal compound may be applied to the second substrate layer 21 and dried, and then the polymerizable liquid crystal compound may be polymerized to form the second liquid crystal layer 22.

Next, the polarizing plate connecting component layer 36a of the polarizing plate 61 attached to the component layer and the first liquid crystal layer 12 of the first liquid crystal layer 10 attached to the substrate layer are bonded together (Figure 1 (d)), and a layer 41 containing a liquid crystal layer attached to the substrate layer (a second layer containing a liquid crystal layer attached to the substrate layer) is obtained by forming a polarizing plate connecting component layer 36 from the polarizing plate connecting component layer 36a (Figure 1 (e)). As for the method of forming the polarizing plate bonding layer 36 from the polarizing plate bonding layer 36a, it can be selected according to the components contained in the polarizing plate bonding layer 36a. For example, the polarizing plate bonding layer 36a can be hardened. When the components do not need to be hardened, the polarizing plate bonding layer 36a can be used as the polarizing plate bonding layer 36 without special treatment. The layer 41 containing the liquid crystal layer with the substrate layer is shown in Figure 1 (e), and includes the polarizing plate 60, the polarizing plate bonding layer 36, the first liquid crystal layer 12, and the first substrate layer 11 in order.

Next, a method for obtaining a circular polarizer 52 from the layer 41 containing a liquid crystal layer with a substrate layer prepared as described above is described with reference to FIGS. 2 and 3. First, by peeling off the first substrate layer 11 from the layer 41 containing a liquid crystal layer with a substrate layer, a layer 42 containing a liquid crystal layer is obtained, which includes a polarizer 60, a polarizer bonding layer 36, and a first liquid crystal layer 12 in sequence (FIG. 2 (a)). Subsequently, a step is performed to obtain a layer 43 containing a liquid crystal layer with a component layer attached, in which a bonding layer 30a for forming a bonding layer 30 is provided on the layer 42 containing a liquid crystal layer (a second layer containing a liquid crystal layer with a component layer attached) (FIG. 2 (b)). In the step of obtaining the layer 43 containing the liquid crystal layer with the attached component layer, as shown in Figure 2 (b), the component layer 30a is formed on the exposed surface of the first substrate layer 11 side of the first liquid crystal layer 12 exposed by peeling the first substrate layer 11 from the layer 41 containing the liquid crystal layer with the attached substrate layer in the layer 42 containing the liquid crystal layer. Regarding the step of forming the bonding composition layer 30a on the layer 42 containing the liquid crystal layer, when the bonding layer 30 of the circularly polarizing plate 52 (Figure 3(b)) is a bonding agent curing layer, there may be a step of applying the bonding agent on the layer 42 containing the liquid crystal layer, and there may also be a step of drying the applied bonding agent as needed. Furthermore, regarding the step of forming the bonding component layer 30a on the layer 42 containing the liquid crystal layer, when the bonding layer 30 of the circularly polarizing plate 52 (Figure 3(b)) is an adhesive layer, there may be a step of applying the adhesive on the layer 42 containing the liquid crystal layer and, if necessary, drying the applied adhesive, or there may be a step of forming the adhesive layer on the release-treated surface of the release film and transferring the adhesive layer of the release film to the layer 42 containing the liquid crystal layer. The layer 43 containing the liquid crystal layer attached with the component layer is shown in FIG. 2 (b), and includes the polarizing plate 60, the polarizing plate bonding layer 36, the first liquid crystal layer 12, and the bonding component layer 30a in sequence.

Next, a step of laminating the bonding composition layer 30a of the layer 43 containing the liquid crystal layer attached to the composition layer and the second liquid crystal layer 22 of the second liquid crystal layer 20 attached to the substrate layer shown in FIG. 1 (c) is performed (FIG. 2 (c)), and the bonding layer 30 is formed from the bonding composition layer 30a to obtain the circular polarizing plate 51 (circular polarizing plate) attached to the substrate layer (FIG. 3 (a)). As for the method of forming the bonding layer 30 from the bonding composition layer 30a, it can be selected according to the components contained in the bonding composition layer 30a. For example, the bonding composition layer 30a can be hardened. When the components do not need hardening treatment, the bonding composition layer 30a can be used as the bonding layer 30 without special treatment. The circular polarizing plate 51 with substrate layer is shown in FIG. 3 (a). Since it includes the polarizing plate 60, the polarizing plate bonding layer 36, the first liquid crystal layer 12, the bonding layer 30, the second liquid crystal layer 22, and the second substrate layer 21 in sequence, it is the circular polarizing plate obtained by the present invention, and it can also be a circular polarizing plate with substrate layer having the second substrate layer 21.

The method for manufacturing the circular polarizing plate 52 may further include a step of peeling off the second substrate layer 21 after laminating the layer 43 containing the liquid crystal layer attached to the component layer and the second liquid crystal layer 20 attached to the substrate layer (FIG. 3(b)). Specifically, the step of peeling off the second substrate layer 21 from the circular polarizing plate 51 attached to the substrate layer (FIG. 3(b)). In addition, the method for manufacturing the circular polarizing plate 52 may further include a step of forming an optical element on the exposed surface of the second substrate layer 21 side of the second liquid crystal layer 22 exposed by peeling off the second substrate layer 21, and then connecting the component layer 35 to obtain the circular polarizing plate 53 (circular polarizing plate) attached to the component layer (FIG. 3(c)). The circular polarizing plate 53 attached with component layers is shown in FIG. 3 (c). Since it includes the polarizing plate 60, the polarizing plate bonding layer 36, the first liquid crystal layer 12, the bonding layer 30, the second liquid crystal layer 22, and the optical element bonding component layer 35 in sequence, it is the circular polarizing plate obtained by the present invention, and can also be a circular polarizing plate attached with component layers having an optical element bonding component layer.

In the manufacturing method of the circular polarizing plate 52, as shown in FIG. 1 (e), FIG. 2 (a), and FIG. 2 (b), a bonding component layer 30a is formed on the exposed surface of the first substrate layer 11 side of the first liquid crystal layer 12 exposed by peeling the first substrate layer 11 from the layer 41 containing the liquid crystal layer with the substrate layer (hereinafter referred to as "the exposed surface of the layer 42 containing the liquid crystal layer"). Compared with the first liquid crystal layer 12 on the opposite side to the first substrate layer 11, the bonding component layer 30a shows a higher affinity to the exposed surface of the layer 42 containing the liquid crystal layer. Therefore, when the connecting component layer 30a is formed on the exposed surface of the layer 42 containing the liquid crystal layer, the connecting component layer 30a can be formed on the exposed surface of the layer 42 containing the liquid crystal layer with higher adhesion than when the connecting component layer is formed on the side of the first liquid crystal layer 12 opposite to the first substrate layer 11.

The reason is presumed as follows. It is considered that since the first liquid crystal layer 12 is formed by polymerizing (reacting) a polymerizable liquid crystal compound on the first substrate layer 11, the surface characteristics of the exposed surface of the layer 42 containing the liquid crystal layer and the first liquid crystal layer 12 on the opposite side of the first substrate layer 11 (the side exposed to the atmosphere during polymerization of the polymerizable liquid crystal compound) are different. It is presumed that due to the difference in surface characteristics, the affinity for the bonding composition that will become the bonding composition layer 30a on each surface is different, and the bonding composition layer 30a can be formed by suppressing shrinkage (cissing) on the exposed surface of the layer 42 containing the liquid crystal layer compared to the first liquid crystal layer 12 on the opposite side of the first substrate layer 11. As a result, it is considered that the unevenness of the bonding composition layer 30a formed on the layer 42 containing the liquid crystal layer can be suppressed more than the side of the first liquid crystal layer 12 opposite to the first substrate layer 11, and the layer 42 containing the liquid crystal layer and the bonding composition layer 30a can be laminated with higher adhesion. Based on this, it is considered that the generation of wrinkles in the circular polarizing plate 52 and the generation of bubbles between the layer 42 containing the liquid crystal layer and the bonding layer 30 can be suppressed, and the layer 42 containing the liquid crystal layer and the second liquid crystal layer 22 can be laminated with higher adhesion. Furthermore, since a circular polarizing plate with good appearance can be obtained by suppressing the generation of unevenness, wrinkles, and bubbles in the circular polarizing plate 52, it is possible to suppress a decrease in visibility when applied to an organic EL display device.

In particular, when the first liquid crystal layer 12 is formed by coating the composition for forming a liquid crystal layer containing both a polymerizable liquid crystal compound and a leveling agent on the first substrate layer 11, it is estimated that the difference between the surface characteristics of the first liquid crystal layer 12 on the first substrate layer 11 side and the surface characteristics on the opposite side is likely to become large. The leveling agent has a function of adjusting the flatness of the coating layer formed by coating the composition for forming a liquid crystal layer and the first liquid crystal layer obtained from the coating layer. It is considered that in the first liquid crystal layer 12 formed by coating the composition for forming a liquid crystal layer containing the leveling agent, the leveling agent is likely to be gathered on the side opposite to the first substrate layer 11 (the side exposed to the atmosphere when the polymerizable liquid crystal compound is polymerized). It is speculated that the exposed surface of the layer 42 containing the liquid crystal layer on the side where the first substrate layer 11 is peeled off from the layer 41 containing the liquid crystal layer attached to the substrate layer has a smaller amount of leveling agent than the first liquid crystal layer 12 on the opposite side of the first substrate layer 11, and therefore has a higher affinity for the bonding composition that will become the bonding composition layer 30a. Based on this, it is believed that when the first liquid crystal layer contains a leveling agent, the exposed surface of the layer 42 containing the liquid crystal layer can easily suppress the unevenness of the bonding composition layer 30a formed on the layer 42 containing the liquid crystal layer, and the layer 42 containing the liquid crystal layer and the bonding composition layer 30a can be laminated with a higher adhesion and a circular polarizing plate with good appearance can be obtained.

In the present invention, the first liquid crystal layer 10 with a substrate layer, the second liquid crystal layer 20 with a substrate layer, the polarizing plate 61 with a component layer, and the laminated products obtained by using the same are preferably long films, and each step is preferably performed while the same is continuously transported. The width direction W is a direction orthogonal to the length direction of the film.

The manufacturing method of the circular polarizing plate of the present invention can be modified as shown in the following modified examples. In addition, the above-mentioned implementation form and the modified examples shown below can be arbitrarily combined.

(Variation 1 of Implementation Form 1)

In the above, although the first liquid crystal layer 10 attached to the substrate layer in which the first liquid crystal layer 12 is formed on the first substrate layer 11 (Figure 1 (b)) and the second liquid crystal layer 20 attached to the substrate layer in which the second liquid crystal layer 22 is formed on the second substrate layer 21 (Figure 1 (c)) are cited as examples for explanation, the present invention is not limited to this. The first liquid crystal layer attached to 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 attached to 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 attached to the substrate layer has the first alignment layer, the circular polarizing plate obtained according to the manufacturing method of the circular polarizing plate of the present invention may have the first alignment layer or may not have the first alignment layer. When the circular polarizing plate has the first alignment layer, when the first substrate layer is peeled off from the layer containing the liquid crystal layer attached to the substrate layer, the adhesion between the layers may be adjusted in such a manner that the first alignment layer remains on the first liquid crystal layer. When the circular polarizing plate does not have the first alignment layer, when the first substrate layer is peeled off from the layer containing the liquid crystal layer attached to the substrate layer, the adhesion between the layers may be adjusted in such a manner that the first substrate layer and the first alignment layer can be peeled off together. When the circular 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 bonding layer 36, and the liquid crystal layer attached to the component layer has the first alignment layer between the first liquid crystal layer 12 and the bonding component layer 30a. In addition, the inventors of the present invention have confirmed that when the exposed surface of the layer containing the liquid crystal layer formed by peeling the first substrate layer from the layer containing the liquid crystal layer attached to the substrate layer is the first alignment layer, the affinity for the bonding component is also higher than that of the first liquid crystal layer on the side opposite to the first substrate layer. Therefore, it is considered that when the exposed surface of the layer containing the liquid crystal layer is the first alignment layer, the layer containing the liquid crystal layer and the subsequent component layer can be laminated with higher adhesion by forming the subsequent component layer on the first alignment layer.

When the second liquid crystal layer 20 attached to the substrate layer has a second alignment layer, the circular polarizer may or may not have the second alignment layer. When the second liquid crystal layer attached to the substrate layer has the second alignment layer, when the second substrate layer is peeled off from the circular polarizer attached to the substrate layer, the adhesion between the layers can be adjusted in such a way that the second alignment layer remains on the second liquid crystal layer or the second alignment layer and the second substrate layer can be peeled off together. When the circular polarizer includes the second alignment layer, the second alignment layer is provided on the opposite side of the second liquid crystal layer to the bonding layer and the optical element can be formed on the second alignment layer with the bonding composition layer.

The adhesion between the layers can be adjusted by the components contained in each layer and the surface treatment performed on the surface of each layer. For example, the adhesion between the alignment layer (the first alignment layer or the second alignment layer), the substrate layer (the first substrate layer or the second substrate layer) and the liquid crystal layer (the first liquid crystal layer or the second liquid crystal layer) can be adjusted by the type and amount of additives such as polymerization initiators, reactive additives, leveling agents, and polymerization inhibitors contained in the alignment layer and the liquid crystal layer, and by surface treatments such as corona treatment, plasma treatment, and flame treatment performed on the alignment layer side surface of the substrate layer and the alignment layer surface provided on the substrate layer.

(Variation 2 of Implementation Form 1)

Although the above description uses the polarizing plate 60 and the polarizing plate 61 with the attached component layer as an example, the manufacturing method of the circular polarizing plate of the present invention is not limited thereto. Instead of the polarizing plate 60 and the polarizing plate 61 with the attached component layer, a transfer substrate layer and a transfer substrate layer with a transfer substrate attaching component layer provided on one side of the transfer substrate layer to form a transfer substrate attaching layer can be used. The transfer substrate attaching component layer can be formed in the same manner as the polarizing plate attaching layer 36 described above.

When using a transfer substrate layer with a component layer attached, the first liquid crystal layer of the first liquid crystal layer with a substrate layer attached and the transfer substrate bonding component layer of the transfer substrate layer with a component layer attached can be laminated, and the transfer substrate bonding layer is formed from the transfer substrate bonding component layer to obtain a layer containing a liquid crystal layer with a substrate layer attached. The method of forming a transfer substrate bonding layer from a transfer substrate bonding component layer can be performed in the same manner as the method of forming a polarizing plate bonding layer 36 from a polarizing plate bonding component layer 36a. The obtained layer containing a liquid crystal layer with a substrate layer includes a transfer substrate layer, a transfer substrate bonding layer, a first liquid crystal layer, and a first substrate layer in order.

Next, by peeling off the first substrate layer from the layer containing the liquid crystal layer attached to the substrate layer and forming an exposed surface on the first substrate layer side of the first liquid crystal layer, a layer containing the liquid crystal layer is obtained, which sequentially includes a transfer substrate layer, a bonding layer for the transfer substrate layer, and the first liquid crystal layer. After setting a bonding component layer on the first liquid crystal layer side of the obtained layer containing the liquid crystal layer in accordance with the same procedure as the above-mentioned embodiment, the bonding component layer is bonded to the second liquid crystal layer of the second liquid crystal layer attached to the substrate layer. Next, the second substrate layer is peeled off, and a component layer of a polarizing plate attached to the component layer is bonded to the exposed surface formed on the second substrate layer side of the second liquid crystal layer to obtain a circularly polarizing plate. In the circular polarizing plate of this variant, the transfer substrate layer can be used as the optical element layer of the above-mentioned embodiment, and the transfer substrate layer can be used as a separator.

In this way, when the layer containing the liquid crystal layer with the substrate layer has a transfer substrate layer, in the step of forming an exposed surface on the substrate layer side of the first liquid crystal layer, the layer containing the liquid crystal layer can be obtained by peeling the first substrate layer without peeling the transfer substrate layer.

In this variant, the phase difference layer that will become the first liquid crystal layer and the second liquid crystal layer satisfies the following relationship [a’] or [b]: [a’] the first liquid crystal layer is a 1/4 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate, [b] one of the first liquid crystal layer and the second liquid crystal layer is a reverse wavelength dispersion 1/4 wavelength plate, and the other is a positive C plate.

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

[Implementation form 2]

Figures 4 and 5 are schematic cross-sectional views schematically showing an example (implementation form 2) of the manufacturing steps of the circular polarizing plate of the present invention. In the figure, W represents the width direction. The layer structure of the circular polarizing plate 57 obtained according to the manufacturing method of the present invention is as shown in Figure 5 (b), which sequentially includes a polarizing plate 60 (polarizing functional layer) having a protective layer formed on at least one side of the polarizing layer, a polarizing plate bonding layer 31 (polarizing functional layer bonding layer bonding layer), a first liquid crystal layer 12, a bonding layer 34 (bonding layer), and a second liquid crystal layer 22. The circular polarizer obtained by the manufacturing method of the present invention is as shown in Figure 5 (a) and (c), and may include a second substrate layer 21 or an optical element bonding composition layer 35 on the side of the second liquid crystal layer 22 opposite to the bonding layer 34.

In the manufacturing method of the circular polarizing plate 57 shown in Figure 5(b), the steps of preparing the first liquid crystal layer 10 attached to the substrate layer having a structure in which the first liquid crystal layer 12 is stacked on the first substrate layer 11 (substrate layer) (Figure 1(b)) and preparing the second liquid crystal layer 20 attached to the substrate layer having a structure in which the second liquid crystal layer 22 is stacked on the second substrate layer 21 (Figure 1(c)) are performed. Regarding the step of preparing the first liquid crystal layer 10 attached to the substrate layer, it is sufficient if the first liquid crystal layer 10 attached to the 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, or it can include the 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 attached to the substrate layer can also include the step of polymerizing the 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 attached to the substrate layer and the second liquid crystal layer 20 attached to the substrate layer are laminated with the bonding layer 34 interposed therebetween in such a manner that the first liquid crystal layer 12 and the second liquid crystal layer 22 face each other, thereby obtaining a layer 46 containing a liquid crystal layer attached to the substrate layer (the first layer containing a liquid crystal layer attached to the substrate layer) (FIG. 4(a)). The layer 46 containing a liquid crystal layer attached to the substrate layer includes, as shown in FIG. 4(a), the first substrate layer 11, the first liquid crystal layer 12, the bonding layer 34, the second liquid crystal layer 22, and the second substrate layer 21 in order.

Next, referring to FIG. 4 and FIG. 5, a method for obtaining a circular polarizing plate 57 from the layer 46 containing a liquid crystal layer with a substrate layer prepared as described above is described. First, by peeling the first substrate layer 11 from the layer 46 containing a liquid crystal layer with a substrate layer, a layer 47 containing a liquid crystal layer is obtained, which sequentially includes the first liquid crystal layer 12, the bonding layer 34, the second liquid crystal layer 22, and the second substrate layer 21 (FIG. 4 (b)).

Subsequently, a step is performed to obtain a layer 48 (the first layer containing a liquid crystal layer with an attached component layer) containing a liquid crystal layer with an attached component layer, in which a polarizing plate attaching component layer 31a (polarizing functional layer attaching component layer) is provided on a layer 47 containing a liquid crystal layer (Figure 4 (c)). In the step of obtaining the layer 48 containing the liquid crystal layer with the attached component layer, as shown in FIG4(c), the exposed surface of the first substrate layer 11 side of the first liquid crystal layer 12 exposed by peeling the first substrate layer 11 from the layer 46 containing the liquid crystal layer with the attached substrate layer in the layer 47 containing the liquid crystal layer forms the component layer 31a for connecting to the polarizing plate. Regarding the step of forming the polarizing plate bonding composition layer 31a on the layer 47 containing the liquid crystal layer, when the polarizing plate bonding layer 31 of the circularly polarizing plate 57 (Figure 5(b)) is an adhesive curing layer, it may include a step of applying the adhesive on the layer 47 containing the liquid crystal layer, and may also include a step of drying the applied adhesive as needed. Furthermore, regarding the step of forming the polarizing plate bonding component layer 31a on the layer 47 containing the liquid crystal layer, when the polarizing plate bonding layer 31 of the circularly polarizing plate 57 (Figure 5(b)) is an adhesive layer, there may be a step of applying an adhesive on the layer 47 containing the liquid crystal layer and, if necessary, drying the applied adhesive, or there may be a step of forming an adhesive layer on the release-treated surface of a release film and transferring the adhesive layer of the release film to the layer 47 containing the liquid crystal layer. The layer 48 containing the liquid crystal layer with the attached component layer is shown in FIG. 4(c), and includes the polarizing plate connecting component layer 31a, the first liquid crystal layer 12, the connecting layer 34, the second liquid crystal layer 22, and the second substrate layer 21 in sequence.

Next, a step is performed to bond the polarizing plate bonding layer 31a of the layer 48 containing the liquid crystal layer with the attached component layer to the polarizing plate 60 (Figure 4 (d)), and a circular polarizing plate 56 (circular polarizing plate) with an attached substrate layer is obtained by forming a polarizing plate bonding layer 31 from the polarizing plate bonding component layer 31a (Figure 5 (a)). As for the method of forming the polarizing plate bonding layer 31 from the polarizing plate bonding component layer 31a, it can be selected according to the components contained in the polarizing plate bonding component layer 31a. For example, the polarizing plate bonding component layer 31a can be hardened. When the component does not require hardening treatment, the polarizing plate bonding component layer 31a can be used as the polarizing plate bonding layer 31 without special treatment. The circular polarizing plate 56 with substrate layer is shown in FIG. 5 (a). Since it includes the polarizing plate 60, the polarizing plate bonding layer 31, the first liquid crystal layer 12, the bonding layer 34, the second liquid crystal layer 22, and the second substrate layer 21 in sequence, it is the circular polarizing plate obtained by the present invention, and it can also be a circular polarizing plate with substrate layer having the second substrate layer 21.

The manufacturing method of the circular polarizing plate 57 may further include the step of peeling off the second substrate layer 21 from the circular polarizing plate 56 attached to the substrate layer (Figure 5 (b)), and forming an optical element on the exposed surface side of the second substrate layer 21 of the second liquid crystal layer 22 exposed by peeling off the second substrate layer 21, and connecting the component layer 35 to obtain the circular polarizing plate 58 (circular polarizing plate) attached to the component layer (Figure 5 (c)). The circular polarizing plate 58 attached with component layers is shown in FIG. 5 (c). Since it includes the polarizing plate 60, the polarizing plate bonding layer 31, the first liquid crystal layer 12, the bonding layer 34, the second liquid crystal layer 22, and the optical element bonding component layer 35 in sequence, it is the circular polarizing plate obtained by the present invention, and can also be a circular polarizing plate attached with component layers having an optical element bonding component layer.

In the method for manufacturing the circular polarizing plate 57, as shown in Fig. 4 (a) to (c), a polarizing plate bonding composition layer 31a is formed on the exposed surface of the first liquid crystal layer 12 on the first substrate layer 11 side (hereinafter referred to as "exposed surface of the layer 47 containing the liquid crystal layer") of the layer 47 containing the liquid crystal layer, which is exposed by peeling the first substrate layer 11 from the layer 46 containing the liquid crystal layer with the substrate layer attached. The polarizing plate bonding composition layer 31a shows a higher affinity to the exposed surface of the layer 47 containing the liquid crystal layer than to the first liquid crystal layer 12 on the opposite side to the first substrate layer 11. Therefore, when the polarizing plate-attached component layer 31a is formed on the exposed surface of the layer 47 containing the liquid crystal layer, the polarizing plate-attached component layer 31a can be formed on the layer 47 containing the liquid crystal layer with higher adhesion than when the polarizing plate-attached component layer 31a is formed on the first liquid crystal layer 12 on the opposite side to the first substrate layer 11.

The reason is as explained in the previous embodiment. It is believed that since the polymerizable liquid crystal compound is polymerized (reacted) on the first substrate layer 11 to form the first liquid crystal layer 12, the surface properties of the exposed surface of the layer 47 containing the liquid crystal layer are different from the surface properties of the opposite side (the side exposed to the atmosphere when the polymerizable liquid crystal compound is polymerized). Compared with the first liquid crystal layer 12 on the opposite side to the first substrate layer 11, the exposed surface of the layer 47 containing the liquid crystal layer is more able to suppress shrinkage and form the polarizing plate bonding component layer 31a. Based on this, it is considered that, compared with the first liquid crystal layer 12 being the opposite side to the first substrate layer 11, the exposed surface of the layer 47 containing the liquid crystal layer can better suppress the generation of unevenness in the polarizing plate bonding composition layer 31a formed on the layer 47 containing the liquid crystal layer, and can laminate the layer 47 containing the liquid crystal layer and the polarizing plate bonding composition layer 31a with higher adhesion, and can suppress the generation of wrinkles in the circular polarizing plate 57, or suppress the generation of bubbles between the layer 47 containing the liquid crystal layer and the polarizing plate bonding layer 31, and can laminate the layer 47 containing the liquid crystal layer and the second liquid crystal layer 22 with higher adhesion. Furthermore, since a circular polarizing plate with good appearance can be obtained by suppressing the generation of unevenness, wrinkles, and bubbles in the circular polarizing plate 57, it is possible to suppress a decrease in visibility when applied to an organic EL display device.

As described in the previous embodiment, when the first liquid crystal layer 12 is formed by coating the liquid crystal layer forming composition containing both a polymerizable liquid crystal compound and a leveling agent on the first substrate layer 11, it is estimated that the difference in surface characteristics between the first substrate layer 11 side of the first liquid crystal layer 12 and the surface characteristics on the opposite side thereof is likely to become large due to the difference in the amount of the leveling agent present. Therefore, it is considered that the amount of leveling agent is smaller on the side where the first substrate layer 11 is exposed by peeling off the layer 46 containing the liquid crystal layer attached to the substrate layer, that is, the exposed surface of the layer 47 containing the liquid crystal layer, compared with the first liquid crystal layer 12 on the opposite side to the first substrate layer 11, so it is easy to suppress the generation of unevenness in the polarizing plate bonding composition layer 31a formed on the layer 47 containing the liquid crystal layer, and the layer 47 containing the liquid crystal layer and the polarizing plate bonding composition layer 31a can be laminated with a higher adhesion and a circularly polarizing plate with good appearance can be obtained.

In this embodiment, the first liquid crystal layer 10 with a substrate layer, the second liquid crystal layer 20 with a substrate layer, the polarizing plate 60, and the laminated material obtained by using the same are preferably long films, and each step is preferably performed while the same is continuously transported. The width direction W is a direction orthogonal to the length direction of the film.

The method for manufacturing the circular polarizing plate of this embodiment can be modified as shown in the following variations. In addition, the above embodiment and the following variations can be combined arbitrarily.

(Variation of Implementation Form 2)

Similar to the previous embodiment, in this embodiment, the first liquid crystal layer attached to 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 attached to the substrate layer may have a second alignment layer between the second substrate layer and the second liquid crystal layer. The description of the first alignment layer or the second alignment layer is omitted because it is described in the variation of the previous embodiment.

(Implementation form 3)

A method for manufacturing a circular polarizing plate, the circular polarizing plate sequentially comprising a polarizing functional layer including at least a linear polarizing layer, a bonding layer for the polarizing functional layer, and a liquid crystal layer, the method comprising the following steps: preparing a liquid crystal layer attached to a substrate layer having a liquid crystal layer formed of a composition containing a polymerizable liquid crystal compound on a first substrate layer; The step of peeling the material layer from the liquid crystal layer attached to the substrate layer; the step of applying the bonding composition on the peeling surface formed by peeling the first substrate layer and hardening it to set the bonding layer for the polarizing functional layer; and the step of bonding the polarizing functional layer to the bonding layer for the polarizing functional layer formed on the peeling surface; and the manufacturing method also falls within the scope of this application.

In this embodiment, the liquid crystal layer can be the first liquid crystal layer mentioned above, or can be the second liquid crystal layer.

When the liquid crystal layer of the circular polarizing plate of the present embodiment is the first liquid crystal layer, it may further include a second liquid crystal layer. When the circular polarizing plate of the present embodiment further includes a second liquid crystal layer, it includes the above-mentioned polarizing functional layer, a bonding layer for the polarizing functional layer, the first liquid crystal layer and the second liquid crystal layer in sequence.

The first liquid crystal layer attached to the substrate layer may be the first liquid crystal layer attached to the first substrate layer, or may be the first liquid crystal layer attached to the second substrate layer.

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

The polarizing functional layer, the bonding layer for the polarizing functional layer, the first liquid crystal layer, the second liquid crystal layer, the leveling agent and each step of this embodiment can be the same as those of the previous embodiment.

Although the embodiments and variations of the present invention are described above, the present invention is not limited to the embodiments and variations thereof. For example, the structures and steps of the embodiments and variations thereof can be combined for implementation. The following describes in detail the common items in all the embodiments and variations thereof.

(Circularly polarizing plate obtainable by the manufacturing method of the present invention)

In the circular polarizer 52 shown in FIG. 3 (b) and the circular polarizer 57 shown in FIG. 5 (b), the polarizer 60 is a linear polarizer, the first liquid crystal layer 12 is a 1/2 wavelength plate, and the second liquid crystal layer 22 is a 1/4 wavelength plate. In addition, the polarizer 60 is a linear polarizer, the first liquid crystal layer 12 is a reverse wavelength dispersion 1/4 wavelength plate 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 reverse wavelength dispersion 1/4 wavelength plate.

(Polarizing functional layer)

As for the polarizing functional layer, a polarizing layer, a polarizing plate having a protective layer formed on at least one side of the polarizing layer, and a polarizing plate with a protective film laminated on at least one side of the polarizing plate can be used. In addition, it can be a reflective film, a semi-transmissive reflective film, an optical compensation film, an anti-glare functional film, and a phase difference film on the polarizing layer or on the polarizing plate, or it can be a multi-layer structure having two or more. In addition, the polarizing layer included in the polarizing functional layer can be a liquid crystal layer, that is, a polarizing layer formed using a polymerizable liquid crystal compound (described later). In this specification, the so-called "polarizing layer" refers to a linear polarizing layer having the property of transmitting linear polarization having a vibration plane orthogonal to the absorption axis when non-polarized light is incident.

(Linear polarizing layer (polarizing layer))

The polarizing layer included in the polarizing functional layer is preferably formed by adsorbing and aligning a dichroic dye such as iodine on a polyvinyl alcohol resin film. The polarizing layer can be formed by adsorbing and aligning a dichroic dye on a single layer of polyvinyl alcohol resin film (polyvinyl alcohol molecules contained in the polyvinyl alcohol resin film are aligned), or it can be a laminated film having two or more layers of polyvinyl alcohol resin layers adsorbing and aligning dichroic dyes on a substrate film. Such a polarizing layer can be manufactured using various methods known in the art.

(Polarizing plate)

The polarizing functional layer may be a polarizing plate. The polarizing plate is typically a polarizing plate in which a protective layer (protective film) is attached to one or both sides of a polarizing layer in a form in which a dichroic dye is adsorbed and aligned on a polyvinyl alcohol resin film. The protective layer can be made of, for example, a resin material having excellent transparency, mechanical strength, thermal stability, and elongation. Specifically, the following can be cited: 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 acid resins such as (meth)acrylic acid and polymethyl (meth)acrylate; cellulose triacetate, cellulose diacetate, and cellulose acetate propionic acid. esters; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate resins; polystyrene resins; polyarylate resins; polysulfone resins; polyethersulfone resins; polyamide resins; polyimide resins; polyetherketone resins; polyphenylene sulfide resins; polyphenylene ether resins, and mixtures and copolymers thereof. Among these resins, any one of cyclic polyolefin resins, polyester resins, cellulose ester resins and (meth)acrylic resins or mixtures thereof is preferably used. In addition, the above-mentioned "(meth)acrylic acid" means "at least one of acrylic acid and methacrylic acid".

The protective layer may be a single layer formed by mixing one or more resin materials, or may have a multi-layer structure of more than two layers. When having a multi-layer structure, the resins forming each layer may be the same or different. When the protective layer is a film formed by a resin material, any additive may be added to the protective layer. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.

The thickness of the polarizing layer formed by adsorbing and aligning the dichroic pigment on the polyvinyl alcohol resin film is preferably less than 20μm, and more preferably less than 10μm.

The polarizing functional layer of the circular polarizing plate of the present invention is particularly preferably one with a protective layer attached only to one side of the polarizing layer (hereinafter referred to as a "single-sided protected polarizing plate"). As mentioned above, the first liquid crystal layer and the second liquid crystal layer are formed by polymerizable liquid crystal compounds and are very thin films. When the linear polarizing plate is a single-sided protected polarizing plate, because it is thinner, the thickness of the circular polarizing plate of the present invention can be made thinner. Therefore, for example, when the organic EL display device having the circular polarizing plate of the present invention is a flexible organic EL display device that can be bent, rolled, etc., it is not easy to be affected by bending, rolling, etc., which is very advantageous. Although the thickness of the protective layer of the single-sided protective polarizing plate can be optimized according to the thickness of the polarizing layer itself, in order to ensure the good flexibility of the circular polarizing plate of the present invention, its thickness is preferably less than 50μm, and more preferably less than 30μm.

The above-mentioned single-side protected polarizing plate can be, for example, the one disclosed in JP2016-122025.

The polarizing layer included in the polarizing functional layer of the circular polarizing plate of the present invention is as described above, and can be a cured film formed by aligning the dichroic pigment on the polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. The polarizing layer at this time can usually be obtained by coating a composition containing a polymerizable liquid crystal compound and a dichroic pigment on a substrate layer, or on an alignment layer disposed on the substrate layer and drying, and irradiating active energy rays such as ultraviolet rays to polymerize and cure the polymerizable liquid crystal compound contained in the coating film. 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 used to form the above-mentioned cured film is not particularly limited. Generally, in terms of strength, operability and other workability, 1 to 300 μm is preferred, 10 to 200 μm is more preferred, and 30 to 120 μm is even more preferred.

(1st substrate layer and 2nd substrate layer)

The first substrate layer and the second substrate layer (hereinafter, both are collectively referred to as "substrate layers") are preferably films formed of resin materials. The resin material is also similar to the material forming the protective film of the polarizing plate, for example, a resin material having excellent transparency, mechanical strength, thermal stability, elongation, etc. can be used. Typical examples and suitable examples of the resin material are the resin materials exemplified for the protective layer of the polarizing plate.

The substrate layer may be a single layer formed by mixing one or more resin materials, or may have a multi-layer structure of more than two layers. When having a multi-layer structure, the resin materials forming each layer may be the same or different. When the substrate layer is a film formed by a resin material, any additive may be added to the substrate layer. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and coloring agents.

The thickness of the substrate layer used to form the liquid crystal layer is not particularly limited. Generally, in terms of strength, operability and other workability, 1 to 300 μm is preferred, 10 to 200 μm is more preferred, and 30 to 120 μm is even more preferred.

(1st alignment layer and 2nd alignment layer)

The first alignment layer and the second alignment layer (hereinafter, the two are collectively referred to as "alignment layer") that the circular polarizer may contain have an alignment constraint force that causes the polymerizable liquid crystal compound contained in the liquid crystal layer formed thereon to align the liquid crystal in the desired direction. The alignment layer can include: an alignment polymer layer formed by an alignment polymer, a photoalignment polymer layer formed by a photoalignment polymer, and a groove alignment layer having a concave-convex pattern or a plurality of grooves on the surface of the layer. The thickness of the alignment layer is usually 10 to 500 nm, preferably 10 to 200 nm.

The alignment polymer layer is formed by coating a composition obtained by dissolving the alignment polymer in a solvent on a substrate layer, removing the solvent, and performing a rubbing treatment as needed. At this time, in the alignment polymer layer formed by the alignment polymer, the alignment constraint force can be arbitrarily adjusted by the surface state of the alignment polymer and the rubbing conditions.

The photo-aligned polymer layer can be formed by coating a composition containing a polymer or monomer having a photoreactive group and a solvent on a base layer and irradiating the layer with polarized light. At this time, the alignment restraining force in the photo-aligned polymer layer can be arbitrarily adjusted by adjusting the polarized light irradiation conditions of the photo-aligned polymer.

The groove alignment layer can be formed by the following methods, for example: a method of exposing and developing the surface of a photosensitive polyimide film through an exposure mask having a slit in a pattern shape to form a concave-convex pattern; a method of forming an uncured layer of an active energy ray-curable resin on a plate-shaped original having grooves on the surface and transferring the layer to a substrate layer and curing it; and a method of forming an uncured layer of an active energy ray-curable resin on a substrate layer, and forming the concave-convex by pressurizing a roller-shaped original having concave-convex to contact the layer and curing it, etc.

(1st liquid crystal layer and 2nd liquid crystal layer)

Both the first liquid crystal layer and the second liquid crystal layer (hereinafter, the two are collectively referred to as "liquid crystal layers") are formed using a polymerizable liquid crystal compound, and the polymerizable liquid crystal compound can be a well-known one. The type of polymerizable liquid crystal compound is not particularly limited, and a rod-shaped liquid crystal compound, a disc-shaped liquid crystal compound, and a mixture of these liquid crystal compounds can be used. Here, the polymerizable liquid crystal compound used to form the reverse wavelength dispersion 1/4 wavelength plate is a rod-shaped liquid crystal compound, for example, the polymerizable liquid crystal compound described in Japanese Patent Publication No. 2011-207765 is preferred. When such a polymerizable liquid crystal compound is used, a coating film is formed by applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound and a solvent and various additives as needed on an alignment layer, and the coating film is cured to form a liquid crystal layer belonging to a liquid crystal curing layer. Alternatively, a coating film can be formed by applying a composition for forming a liquid crystal layer on a substrate layer, and the coating film and the substrate layer are extended together to form a liquid crystal layer. The liquid crystal layer can also be a phase difference layer.

In addition to the above-mentioned polymerizable liquid crystal compounds and solvents, the composition for forming a liquid crystal layer may also contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, etc. The polymerizable liquid crystal compound, solvent, polymerization initiator, reactive additive, leveling agent, polymerization inhibitor, etc. can be appropriately used. As for the composition for forming a liquid crystal layer and the leveling agent that the liquid crystal layer can contain, for example, there can be cited: a leveling agent with organic modified polysilicone oil as the main component, a leveling agent with polyacrylate compounds as the main component, a leveling agent with fluorine-containing compounds such as perfluoroalkyl compounds as the main component, etc. The so-called main component here refers to the component with the largest amount of all the components contained in the leveling agent. As for the leveling agent, among the above, it is preferred to use a leveling agent with a polyacrylate compound as the main component, or a leveling agent with a fluorine atom-containing compound such as a perfluoroalkyl compound as the main component. The content of the leveling agent in the liquid crystal layer forming composition is preferably 0.01 to 5 parts by mass, preferably 0.1 to 3 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound.

As mentioned above, in the circularly polarizing plate of the present invention, the first liquid crystal layer preferably contains a leveling agent, so the liquid crystal layer forming composition used to form the first liquid crystal layer preferably contains a leveling agent.

(Next layer)

The bonding layer is disposed between the first liquid crystal layer and the second liquid crystal layer and is used to bond the two liquid crystal layers. The bonding layer can directly contact the first liquid crystal layer and the second liquid crystal layer, and can also directly contact the first alignment layer disposed on the first liquid crystal layer and the second alignment layer disposed on the second liquid crystal layer.

The adhesive layer can be formed by adhesives, adhesives, and combinations thereof, usually one layer, but can be two or more layers. When the adhesive layer is composed of two or more layers, each layer can be formed of the same material or different materials.

The adhesive can be formed by combining one or more of water-based adhesives, active energy ray-curing adhesives, and adhesives. Examples of water-based adhesives include polyvinyl alcohol-based resin aqueous solutions and water-based two-component urethane emulsion adhesives. Active energy ray-curing adhesives are adhesives that are cured by irradiation with active energy rays such as ultraviolet rays, and examples thereof include those containing polymerizable compounds and photopolymerizable initiators, those containing photoreactive resins, and those containing adhesive resins and photoreactive crosslinking agents. Examples of the polymerizable compounds include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, and oligomers derived from these monomers. The above-mentioned photopolymerization initiator can include a substance containing active species such as neutral free radicals, anionic free radicals, and cationic free radicals generated by irradiation with active energy rays such as ultraviolet rays.

Adhesives can be composed of (meth) acrylic resins, styrene resins, silicone resins, etc. as base polymers and added with crosslinking agents such as isocyanate compounds, epoxy compounds, and aziridine compounds.

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

The surface of the layer to be formed as the bonding layer can be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, etc. as needed.

The bonding layer is preferably an adhesive curing layer. In this case, the bonding composition layer is a layer formed using an adhesive, and the adhesive is preferably an active energy ray curing type adhesive such as an ultraviolet curing adhesive. By making the bonding layer an adhesive curing layer, when the circular polarizing plate is applied to a flexible organic EL display device, even when the circular polarizing plate is bent or rolled up along with the bending or rolling of the flexible organic EL display device, it is easy to suppress the generation of wrinkles between the first liquid crystal layer and the second liquid crystal layer.

The above has described the adhesive and the adhesive that form the adhesive layer. However, in the circularly polarizing plate of the present invention, the adhesive layer used to bond the first liquid crystal layer to the second liquid crystal layer is preferably an adhesive curing layer formed by using an adhesive.

(Adhesive layer for polarizing plate)

The polarizing plate bonding layer can be formed by bonding agents, adhesives and combinations thereof, usually one layer, but may be two or more layers. When the polarizing plate bonding layer is composed of two or more layers, each layer may be formed of the same material or different materials. The bonding agents and adhesives used to form the polarizing plate bonding layer may be the same as those used in the above bonding layer. The surface of the layer to be formed into the polarizing plate bonding layer may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, etc. as needed.

(Optical elements are used to form material layers)

The optical element bonding composition layer can be formed using bonding agents, adhesives, and combinations thereof, and is usually one layer, but may be two or more layers. When the optical element bonding composition layer is composed of two or more layers, each layer may be formed of the same material or different materials. The bonding agents and adhesives used to form the optical element bonding composition layer may be the same as those used for the bonding layer. The optical element bonding composition layer is preferably formed using an adhesive. The surface of the layer on which the optical element bonding composition layer is to be formed may be subjected to surface treatment such as corona treatment, plasma treatment, and flame treatment as needed. The optical element is preferably connected to a component layer formed by using an adhesive.

[Implementation example]

The following discloses embodiments and comparative examples to more specifically illustrate the present invention, but the present invention is not limited to these examples. "%" and "parts" in the embodiments are mass % and mass parts unless otherwise specified.

[Next, preparation of components]

After mixing the cationic curable components a1 to a3 and the cationic polymerization initiator shown below, further mix the cationic polymerization initiator and sensitizer shown below and defoam to prepare a light-curing adhesive composition. In addition, the following mixing amount is based on the solid component amount.

． Cationic curing component a1 (70 parts):

3',4'-Epoxycyclohexanecarboxylic acid 3',4'-Epoxycyclohexyl methyl ester (trade name: CEL2021P, manufactured by Daicel Co., Ltd.)

． Cationic curing component a2 (20 parts):

Neopentyl glycol diglycidyl ether (trade name: EX-211, manufactured by NAGASE CHEMTEX Co., Ltd.)

． Cationic curing component a3 (10 parts):

2-Ethylhexyl epoxypropyl ether (trade name: EX-121, manufactured by NAGASE CHEMTEX Co., Ltd.)

． Cationic polymerization initiator (2.25 parts (solid content)):

Product name: CPI-100 (made by SAN-APRO Co., Ltd.) 50% propylene carbonate solution

． Sensitizer (2 parts):

1,4-Diethoxynaphthalene

[Comparison Example 1]

(Preparation of composition for forming photo-alignment layer)

The composition for forming a photo-alignment layer was obtained by mixing the following components and stirring the obtained mixture at a temperature of 80°C for 1 hour.

． Photo-aligned materials (5 copies):

．Solvent (95 parts): Cyclopentanone

(Preparation of liquid crystal layer forming composition (A))

The composition (A) for forming a liquid crystal layer is obtained by mixing the following components and stirring the obtained mixture at a temperature of 80°C for 1 hour. The polymerizable liquid crystal compound A1 can be synthesized using the synthesis method of the compound (A11-1) described in Japanese Patent Publication No. 2011-207765. The polymerizable liquid crystal compound A2 can be synthesized using the synthesis method of the compound (x-1) described in Japanese Patent Publication 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)butane-1-one (IRGACURE 369; manufactured by Ciba Specialty Chemicals)

． Leveling agent (0.1 part):

Polyacrylate compound (BYK-361N; manufactured by BYK-Chemie)

．Solvent (400 parts): Cyclopentanone

(Manufacturing of polarizing plates)

A polarizing plate (single-side protected polarizing plate) with a protective film attached to one side is manufactured according to the method described in the embodiment of Japanese Patent Publication No. 2016-122025.

(Manufacturing of the first liquid crystal layer (1) with a substrate layer)

A polyethylene terephthalate (PET) film having a thickness of 100 μm was used as a substrate layer, and the PET film was treated once using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m/min. A composition for forming a photo-alignment layer was applied to the surface subjected to the corona treatment using a rod coater and dried at 80°C for 1 minute, and a polarized UV irradiation device (SPOT CURE SP-7; manufactured by Ushio Electric Co., Ltd.) was used to expose the polarized UV at a cumulative light amount of 100 mJ/cm ² to obtain a photo-alignment layer. The thickness of the obtained photo-alignment layer was measured using a laser microscope (LEXT, manufactured by Olympus Co., Ltd.) and was found to be 100 nm.

Next, the composition for forming a liquid crystal layer (A) was applied on the photo-alignment layer using a bar coater and dried at 120°C for 1 minute. Then, a liquid crystal layer as a phase difference layer was formed by irradiating ultraviolet rays (under a nitrogen atmosphere, wavelength: 365nm, cumulative light quantity at a wavelength of 365nm: 1000mJ/ ^cm2 ) using a high-pressure mercury lamp (UNICURE VB-15201BY-A, manufactured by USHIO Electric Co., Ltd.), thereby obtaining a first liquid crystal layer (1) with a substrate layer. The thickness of the liquid crystal layer was 2μm.

For the obtained first liquid crystal layer (1) with a substrate layer, the above-mentioned bonding composition was applied to the liquid crystal layer on the side opposite to the substrate layer and shrinkage was observed by visually observing the coated surface.

In this way, it is believed that if a single-side protected polarizing plate is bonded via a bonding layer (bonding composition on the first liquid crystal layer (1)) in which shrinkage is observed, the resulting circularly polarizing plate will be observed to have an abnormal appearance due to the shrinkage.

[Implementation Example 1]

The first liquid crystal layer (1) with a substrate layer was obtained in the same procedure as in Comparative Example 1. The liquid crystal layer side of the obtained first liquid crystal layer (1) with a substrate layer was bonded to a glass substrate [alkali-free glass "EAGLE XG" manufactured by Corning, thickness 0.2 mm] via a thin sheet-like adhesive having a thickness of 5 μm ["NCF #L2" manufactured by LINTEC Co., Ltd.], and then the substrate layer was peeled off to obtain a liquid crystal layer with a glass substrate. Only the substrate layer was peeled off, and the photo-alignment layer was not peeled off and remained. When the above-mentioned bonding composition is applied to the peeled surface of the liquid crystal layer attached to the glass substrate and the coated surface is visually observed, the shrinkage is less than that observed in Comparative Example 1, when the bonding composition is applied to the liquid crystal layer side of the first liquid crystal layer (1) attached to the substrate layer.

As described above, if the bonding component layer is disposed on the peeled surface of the first liquid crystal layer (1) after the substrate layer is peeled off, and a polarizing functional layer (such as a single-sided protective polarizing plate) is bonded to the bonding component layer, a circular polarizing plate with excellent appearance can be obtained.

From the results of Example 1 and Comparative Example 1, it is believed that the surface exposed by peeling off the substrate layer from the first liquid crystal layer (1) attached to the substrate layer has less shrinkage, so it has a high affinity for the bonding composition and has excellent adhesion when forming the bonding composition layer.

[Comparison Example 2]

(Preparation of composition for forming alignment layer)

2-Butoxyethanol was added to the commercially available alignment polymer SUNEVER SE-610 (manufactured by Nissan Chemical Industries, Ltd.) to obtain an alignment layer forming composition. The obtained alignment layer forming composition has a solid content of 1% relative to the total amount of the composition, and a solvent content of 99% relative to the total amount of the composition. The solid content of SUNEVER SE-610 is calculated from the concentration stated in the delivery specification.

(Preparation of liquid crystal layer forming composition (B))

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

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

．Polymerization initiator (0.5%):

IRGACURE (registered trademark) 907 (manufactured by BASF Japan)

． Leveling agent (0.1%):

BYK361N (made by BYK-Chemie Japan)

．Reaction additives (1.1%):

Laromer (registered trademark) LR-9000 (manufactured by BASF Japan)

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

A polyethylene terephthalate (PET) film with a thickness of 38 μm was treated once using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m/min. The composition for forming the alignment layer was applied to the surface after the corona treatment using a rod coater and dried at 90°C for 1 minute to obtain the alignment layer. The thickness of the obtained alignment layer was measured using a laser microscope (LEXT, manufactured by Olympus Co., Ltd.) and was found to be 34 nm.

Next, the composition for forming a liquid crystal layer (B) was applied onto the alignment layer using a bar coater and dried at 90°C for 1 minute. Then, a liquid crystal layer as a phase difference layer was formed by irradiating ultraviolet rays (under a nitrogen atmosphere, wavelength: 365nm, cumulative light quantity at a wavelength of 365nm: 1000mJ/ ^cm2 ) using a high-pressure mercury lamp (UNICURE VB-15201BY-A, manufactured by USHIO Electric Co., Ltd.), thereby obtaining a first liquid crystal layer (2) with a substrate layer. The thickness of the liquid crystal layer was 1μm.

With respect to the obtained first liquid crystal layer (2) with a substrate layer, the above-mentioned bonding composition was applied to the liquid crystal layer on the side opposite to the substrate layer and when the coated surface was visually observed, shrinkage was observed.

In this way, it is believed that if a single-side protected polarizing plate is bonded via a bonding layer (bonding composition on the first liquid crystal layer (2)) in which shrinkage is observed, the resulting circularly polarizing plate will be observed to have an abnormal appearance due to the shrinkage.

[Example 2]

The first liquid crystal layer (2) with a substrate layer was obtained in the same procedure as in Comparative Example 2. The liquid crystal layer side of the obtained first liquid crystal layer (2) with a substrate layer was bonded to a glass substrate [alkali-free glass "EAGLE XG" manufactured by Corning, thickness 0.2 mm] via a thin sheet-like adhesive with a thickness of 5 μm ["NCF #L2" manufactured by LINTEC Co., Ltd.], and then the substrate layer was peeled off to obtain a liquid crystal layer with a glass substrate. When the substrate layer was peeled off, the alignment layer was also peeled off. The substrate layer of the liquid crystal layer in the liquid crystal layer with a glass substrate is coated with the above-mentioned bonding composition, and the coated surface is peeled off. When the coated surface is visually observed, it shrinks less than the coated surface observed in Comparative Example 2 in which the bonding composition is coated on the liquid crystal layer side of the first liquid crystal layer (2) with a substrate layer.

As described above, if the bonding component layer is disposed on the peeled surface of the first liquid crystal layer (2) after the substrate layer is peeled off, and a polarizing functional layer (such as a single-sided protective polarizing plate) is bonded to the bonding component layer, a circular polarizing plate with excellent appearance can be obtained.

From the results of Example 2 and Comparative Example 2, it is believed that the surface exposed by peeling the substrate layer from the first liquid crystal layer (2) attached to the substrate layer has less shrinkage, so it has a high affinity for the bonding composition and has excellent adhesion when forming the bonding composition layer.

10: The first liquid crystal layer with substrate layer

11: 1st base material layer

12: 1st liquid crystal layer

20: Second liquid crystal layer with substrate layer

21: Second base material layer

22: Second liquid crystal layer

36: Adhesive layer for polarizing plate (adhesive layer for polarizing functional layer)

36a: Polarizing plate followed by component layer (polarizing functional layer followed by component layer)

41: A layer containing a liquid crystal layer attached to a substrate layer (a second layer containing a liquid crystal layer attached to a substrate layer)

60: Polarizing plate (polarizing functional layer)

61: Polarizing plate with component layer attached (polarizing functional layer with component layer attached)

W: width direction

Claims (11)

A method for manufacturing a circular polarizing plate, the circular polarizing plate sequentially comprising a polarizing functional layer including at least a linear polarizing layer, a bonding layer for the polarizing functional layer, a first liquid crystal layer, a bonding layer, and a second liquid crystal layer, the manufacturing method comprising the following steps: preparing a first layer including a liquid crystal layer attached to a substrate layer, the first layer including a liquid crystal layer attached to a substrate layer being formed on a substrate layer having a first substrate layer and the first liquid crystal layer attached to the substrate layer; The first liquid crystal layer has the aforementioned bonding layer, the aforementioned second liquid crystal layer, and the second substrate layer in order on the first liquid crystal layer side; the step of peeling the aforementioned first substrate layer from the aforementioned first liquid crystal layer containing the substrate layer to form an exposed surface on the aforementioned first substrate layer side of the aforementioned first liquid crystal layer; the step of obtaining the first liquid crystal layer containing the component layer, the aforementioned first liquid crystal layer containing the component layer being on the aforementioned exposed surface; The method comprises the steps of: providing a polarizing functional layer bonding component layer for forming the polarizing functional layer bonding component layer; and bonding the polarizing functional layer to the polarizing functional layer bonding component layer of the first liquid crystal layer containing the bonding component layer; wherein the polarizing functional layer bonding component layer is a layer formed by a water-based bonding agent or an active energy line curing bonding agent, and the first liquid crystal layer contains a leveling agent and The polymerizable liquid crystal compound is polymerized on the first substrate layer, and 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 a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate; [b] one of the first liquid crystal layer and the second liquid crystal layer is a reverse wavelength dispersion 1/4 wavelength plate, and the other is a positive C plate. The manufacturing method of the circular polarizing plate as described in item 1 of the patent application scope, wherein the first liquid crystal layer with the substrate layer comprises a first alignment layer located between the first liquid crystal layer and the first substrate layer, and the step of forming the exposed surface is to peel off the first alignment layer together with the first substrate layer. The manufacturing method of the circular polarizing plate as described in item 1 of the patent application scope, wherein the first liquid crystal layer with a substrate layer comprises a first alignment layer located between the first liquid crystal layer and the first substrate layer, and the first layer containing a liquid crystal layer with a component layer has the first alignment layer between the first liquid crystal layer and the component layer for connecting the polarizing functional layer. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the bonding layer is a bonding agent curing layer or an adhesive layer. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the aforementioned bonding layer is an adhesive curing layer, and the bonding composition layer used to form the aforementioned bonding layer contains an active energy ray curing type adhesive. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the first liquid crystal layer is a 1/2 wavelength plate, and the second liquid crystal layer is a 1/4 wavelength plate. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the first liquid crystal layer is a 1/4 wavelength plate with reverse wavelength dispersion, and the second liquid crystal layer is a positive C plate. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the bonding layer for the polarizing functional layer is a bonding agent curing layer. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope, wherein the second liquid crystal layer is obtained by polymerizing a polymerizable liquid crystal compound on the second substrate layer. The method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application scope includes a step of peeling off the second substrate layer after the aforementioned bonding step. A method for manufacturing a circular polarizing plate as described in item 1 or 3 of the patent application, wherein the polarizing functional layer is a polarizing plate including a protective layer on at least one side of the linear polarizing layer.

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