TWI815906B - Optical laminate and method for producing the same - Google Patents

Abstract

An optical laminate, including a 1st liquid crystal layer, a 1st adhesive layer, a 2nd liquid crystal layer, a 2nd adhesive layer, and a resin film, in this order, wherein at least one end in the width direction of the optical laminate, the position of the end of the 1st adhesive layer is closer to the inner side in the width direction than the position of the end of the first liquid crystal layer, the position of the end of the 2nd adhesive layer is closer to the outer side in the width direction than the position of the end of the 1st adhesive layer and the position of the end of the 2nd liquid crystal layer.

Description

Optical laminated body and manufacturing method thereof

The present invention relates to an optical laminate and a manufacturing method thereof.

In display devices such as organic EL display devices and liquid crystal display devices, members including optically anisotropic films such as polarizing films and retardation films are used. As such an optically anisotropic film, a liquid crystal compound layer formed on a base film that has been subjected to alignment treatment is known.

For example, JPH7-120620A1 describes that a liquid crystal polymer layer formed on an alignment substrate film is transferred to a translucent substrate film via an adhesive layer. Moreover, JP2015-25947A1 describes a laminate in which a 1/2-wavelength retardation layer and a 1/4-wavelength retardation layer formed using a liquid crystal material are laminated.

[Prior technical literature] [Patent Document]

[Patent Document 1] Japan JPH7-120620A1

[Patent Document 2] Japan JP2015-25947A1

An object of the present invention is to provide an optical laminate in which appearance defects and the like are suppressed, and a manufacturing method thereof.

The present invention provides an optical laminate shown below and a manufacturing method thereof.

[1] An optical laminated body including a first liquid crystal layer, a first adhesive layer, a second liquid crystal layer, a second adhesive layer, and a resin film in this order, wherein at least one end portion in the width direction of the optical laminated body , the end position of the first adhesive layer is closer to the inside in the width direction than the end position of the first liquid crystal layer, and the end position of the second adhesive layer is farther than the end position of the first adhesive layer and the aforementioned end position of the first adhesive layer. The end position of the second liquid crystal layer is closer to the outside in the width direction.

[2] The optical laminated body according to [1], wherein at least one end in the width direction of the optical laminated body, further, the end position of the second adhesive layer is in contact with the end of the first liquid crystal layer. The position is the same as or closer to the width direction than it.

[3] The optical laminated body according to [1] or [2], wherein at least one end in the width direction of the optical laminated body, further, the end position of the second adhesive layer is in contact with the resin film. The end position is the same or closer to the inside in the width direction.

[4] The optical laminated body according to any one of [1] to [3], wherein at least one end portion in the width direction of the optical laminated body, further, an end portion of the first liquid crystal layer is in contact with the aforementioned end portion. The ends of the resin film are bonded via the second adhesive layer.

[5] The optical laminated body according to any one of [1] to [4], wherein at both ends in the width direction of the optical laminated body, the end positions of the first adhesive layer are farther than those of the first adhesive layer. The end position of the liquid crystal layer is closer to the width direction inner side, and the end position of the second adhesive layer is closer to the width direction outer side than the end position of the first adhesive layer and the end position of the second liquid crystal layer.

[6] The optical laminate according to any one of [1] to [5], wherein the resin film is an optical film.

[7] The optical laminate according to any one of [1] to [6], further comprising a first alignment layer on the side of the first liquid crystal layer opposite to the first adhesive layer.

[8] The optical laminated body according to any one of [1] to [7], further comprising an adhesive layer for an optical laminated body on a side of the first liquid crystal layer opposite to the first adhesive layer.

[9] The optical laminated body according to [8], further comprising a first alignment layer between the first liquid crystal layer and the adhesive layer for the optical laminated body.

[10] The optical laminate according to any one of [1] to [9], further comprising a first base material layer on the side of the first liquid crystal layer opposite to the first adhesive layer.

[11] The optical laminated body according to [10], wherein at least one end in the width direction of the optical laminated body, further, the end of the second adhesive layer is positioned later than the end of the first liquid crystal layer. The position is closer to the inside in the width direction.

[12] The optical laminate according to [10] or [11], further comprising a first alignment layer between the first liquid crystal layer and the first base material layer.

[13] The optical laminate according to any one of [1] to [12], further comprising a second alignment layer between the second liquid crystal layer and the second adhesive layer.

[14] The optical laminate according to any one of [1] to [13], wherein the first liquid crystal layer is a retardation layer.

[15] The optical laminate according to any one of [1] to [14], wherein the second liquid crystal layer is a retardation layer.

[16] A method of manufacturing an optical laminated body, comprising the following steps: preparing a liquid crystal film having a first base material layer, a first liquid crystal layer, a first adhesive layer, and a second liquid crystal layer in this order; and preparing a resin film. step; and laminating the resin film to the second liquid crystal layer side of the liquid crystal film via a second adhesive layer to obtain an optical laminated body (hereinafter, this optical laminated body will be referred to as an "optical laminated body with a base material layer" ” case) step; wherein, at least one end of the liquid crystal film in the width direction, the end position of the first adhesive layer is closer to the inside in the width direction than the end position of the first 'liquid crystal layer, and is closer to the end position in the width direction of the liquid crystal film. The end positions of the second liquid crystal layer are the same, and the end positions of the second adhesive layer of the optical laminate are closer to the end positions of the first adhesive layer and the end positions of the second liquid crystal layer. Outside in the width direction.

[17] The method for manufacturing an optical laminated body according to [16], wherein the step of preparing the liquid crystal film includes the following steps: The step of preparing the first laminate part including the first base material layer and the first liquid crystal layer, and the second lamination part including the second base material layer and the second liquid crystal layer; The step of bonding the first' liquid crystal layer of the lamination part and the second' liquid crystal layer of the second lamination part to obtain a liquid crystal layer laminate; and by removing the liquid crystal layer laminate from the second base material layer. The step of peeling off the first peeling layer to obtain the aforementioned liquid crystal film; wherein the aforementioned second liquid crystal layer is a layer formed of the aforementioned 2′ liquid crystal layer, and at least one end portion in the width direction of the aforementioned liquid crystal layer laminate, the aforementioned second liquid crystal layer The end position of the first adhesive layer is closer to the inside in the width direction than the end of the first' liquid crystal layer, and is further inside in the width direction than the end of the second' liquid crystal layer.

[18] The method of manufacturing an optical laminated body according to [16] or [17], wherein at least one end of the optical laminated body in the width direction, further, the end position of the second adhesive layer is farther than the above-mentioned end. The end position of the first' liquid crystal layer is closer to the inside in the width direction.

[19] The method for manufacturing an optical laminated body according to any one of [16] to [18], wherein at least one end of the optical laminated body in the width direction, the end position of the second adhesive layer is The position of the end portion of the resin film is the same as or closer to the inside in the width direction than the end position of the resin film.

[20] The method for manufacturing an optical laminated body according to any one of [16] to [19], wherein at both ends of the liquid crystal film in the width direction, the end positions of the first adhesive layer are farther than the The end position of the first liquid crystal layer is closer to the inside in the width direction and is the same as the end position of the second liquid crystal layer. The end position of the second adhesive layer of the optical laminate is farther than the end position of the first adhesive layer. The end position and the end position of the second liquid crystal layer are closer to the outside in the width direction.

[21] The method for manufacturing an optical laminated body according to any one of [16] to [20], further comprising the step of peeling off the second release layer including the first base material layer from the optical laminated body.

[22] The method of manufacturing an optical laminated body as described in [21], wherein the first liquid crystal layer is formed from the first' liquid crystal layer through the step of peeling off the second peeling layer. At at least one end in the width direction of the optical laminate after the second release layer has been peeled off, the end position of the first liquid crystal layer is the same as the end position of the second adhesive layer.

[23] The method for manufacturing an optical laminated body according to any one of [16] to [22], wherein the resin film is an optical film.

According to the present invention, it is possible to provide an optical laminate in which appearance defects are suppressed and a manufacturing method thereof.

10a, 10p: 1st build-up part

11a, 11p: 1st base material layer

12a: 1st retardation layer (1st’ liquid crystal layer)

12a ₁ , 12p, 12p ₁ : 1st phase difference layer (1st liquid crystal layer)

20a, 20p: 2nd build-up part

21a, 21p: 2nd base material layer

22a, 22a ₁ , 22p, 22p ₁ : 2nd retardation layer (2nd liquid crystal layer)

30a, 30p: Adhesion layer (1st adhesion layer)

40a, 40p: Phase difference laminate (liquid crystal laminate)

50a, 50p: Phase difference film (liquid crystal film)

60a, 60p: Optical film (resin film)

62a, 62p: Adhesive layer for optical film (second adhesive layer)

70a, 70p: Optical laminate

71a, 71p: Optical laminated body with base material layer (optical laminated body)

W: Width direction

FIG. 1 is a schematic cross-sectional view schematically showing an example of the optical laminate of the present invention.

FIG. 2 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.

3 (a) to (d) are schematic cross-sectional views schematically showing a part of an example of the manufacturing steps of the optical laminated body of the present invention.

FIG. 4 (a) to (c) are schematic cross-sectional views schematically showing subsequent steps of manufacturing the optical laminated body shown in FIG. 3 .

5 (a) and (b) are schematic cross-sectional views schematically showing a part of an example of the manufacturing steps of the optical laminate based on the present invention.

6(a) to 6(c) are schematic cross-sectional views schematically showing subsequent steps of manufacturing the optical laminated body shown in FIG. 5.

Before describing the preferred embodiments of the optical laminated body of the present invention and its manufacturing method, the premise of the embodiment of the present invention will be explained.

5(a) and (b) and 6(a) to (c) are schematic cross-sectional views schematically showing the manufacturing steps of the optical laminated body 70p based on the embodiment described below.

In the figure, W represents the width direction. In the following, description will be given as an example in which the first liquid crystal layer and the second liquid crystal layer are the first retardation layer and the second retardation layer, and the liquid crystal film is the retardation film.

In the manufacturing method of the optical laminated body 70p, as shown in FIG. 5(a), there is a case where a retardation laminated body 40p is used, and the retardation laminated body 40p includes the first base material layer 11p via the adhesive layer 30p. The first laminated portion 10p of the first retardation layer 12p and the second laminated portion 20p including the second base material layer 21p and the second retardation layer 22p are laminated. As shown in FIG. 5(b) , when the second base material layer 21p is peeled off from the retardation laminated body 40p, a part of the second retardation layer 22p is transferred to the peeled second base material layer 21p to obtain The retardation film 50p of the 2nd retardation layer _22p1 is formed on the adhesive layer 30p. This is because the retardation laminated layer body 40p shown in Figure 5(a) has non-fixed areas that are not fixed to the adhesive layer 30p at both ends of the second retardation layer 22p in the width direction (Figure 5(a) In a), the portion shown with a diagonal line rising to the right), and by peeling off the second base material layer 21p, the second retardation layer 22p is separated into the second retardation layer 22p fixed in the area of the adhesive layer 30p. ₁ is due to the transfer to the non-fixed area of the second base material layer 21p.

Next, the retardation film 50p obtained above (Fig. 5(b) and Fig. 6(a)) and the optical film 60p are prepared. As shown in Fig. 6(b), the optical film is placed through the optical film adhesive layer 62p. 60p was laminated on the second retardation layer 22p ₁ of the retardation film 50p to obtain an optical laminated body with a base material layer 71p. Subsequently, when the first base material layer 11p included in the optical laminate 71p with a base material layer is peeled off, a part of the first retardation layer 12p is transferred to the peeled first base material layer 11p, thereby obtaining the following The layer 30p is an optical laminated body 70p in which the first retardation layer 12p ₁ is formed on the opposite side to the second retardation layer 22p ₁ (Fig. 6(c)). This is because the retardation film 50p shown in FIG. 6(b) has non-fixed regions that are not fixed to the adhesive layer 30p at both ends of the first retardation layer 12p in the width direction (in FIG. 6(b) , the portion shown with a diagonal line rising to the right), and by peeling off the first base material layer 11p, the first retardation layer 12p is separated into the first retardation layer _12p1 fixed in the area of the adhesive layer 30p and the transfer This is due to the non-fixed area of the first base material layer 11p.

However, in the manufacturing method of the optical laminated body 70p, the regions closer to the width direction outer side than the width direction ends of the adhesive layer 30p and the width direction ends of the optical film adhesive layer 62p are separated by the adhesive layer 30p and the optical film. Since the film is not directly bonded to other layers using the adhesive layer 62p, it is more easily deformed than if it is directly bonded to other layers. Therefore, when these regions are extended in the width direction, deformation such as bending and reflection tends to occur during the production of the optical laminated body 70p. In particular, as shown in FIG. 6(b) , both ends in the width direction of the optical film adhesive layer 62p of the optical laminated body with a base material layer 71p are closer to each other than both ends in the width direction of the second retardation layer _22p1 . When the direction is inward, the above-mentioned areas become longer in the width direction, so deformations such as bending and reflection are likely to occur in these areas. Such deformation may cause poor appearance of the optical laminated body 71p with a base material layer and the optical laminated body 70p. When the optical laminated body 71p with a base material layer having a deformed portion is rolled into a roll, it may cause curling. Defects such as ear-shaped protrusions at the ends of objects. Furthermore, due to the deformation occurring in the above-mentioned region, the transportation of the optical laminated body 71p with the base material layer may become unstable.

Therefore, in the following embodiments, it will be explained that by suppressing deformation such as bending and reflection in the end region in the width direction, it is possible to suppress appearance defects of the optical laminate and the optical laminate rolled into a roll shape. An optical laminate that suppresses transportation failure of an optical laminate and a manufacturing method thereof.

Hereinafter, preferred embodiments of the optical laminated body of the present invention and its manufacturing method will be described with reference to the drawings. In the following, description will be given as an example in which the first liquid crystal layer and the second liquid crystal layer are the first retardation layer and the second retardation layer, and the liquid crystal film is the retardation film.

[First embodiment (optical laminated body)]

Fig. 1 is a schematic cross-sectional view schematically showing an example of the optical laminate according to this embodiment. In the figure, W represents the width direction. The optical laminated body 70a of this embodiment includes, for example, a first retardation layer 12a ₁ (first liquid crystal layer), an adhesive layer 30a (first adhesive layer), and a second retardation layer 22a ₁ (second liquid crystal layer) in this order. ), the optical film adhesive layer 62a (second adhesive layer), and the optical film 60a (resin film), wherein at both ends of the optical laminate 70a in the width direction, the end positions of the adhesive layer 30a are at a phase difference from the first phase. Both end positions of the layer 12a ₁ are closer to the width direction inner side, and the end position of the optical film adhesive layer 62 a is closer to the width direction outer side than the end position of the adhesive layer 30 a , and further than the end portion of the second retardation layer 22 a ₁ The position is closer to the outside in the width direction.

At both ends in the width direction W of the optical laminated body 70a, the end positions of the optical film adhesive layer 62a may be the same as the both end positions of the first retardation layer _12a1 , or may be closer to the width than the end positions of the optical film 60a. direction inward. Both ends in the width direction of the first retardation layer 12a ₁ and both ends in the width direction of the optical film 60a may be bonded together via the adhesive layer 62a of the optical film.

The optical laminated body 70a shown in FIG. 1 can include the first retardation layer 12a ₁ , the adhesive layer 30a, the second retardation layer 22a ₁ , the optical film adhesive layer 62a, and the optical film 60a in this order.

As shown in FIG. 1 , the positions of both ends in the width direction of the adhesive layer 30 a of the optical layered body 70 a are closer to the inside in the width direction than the positions of both ends in the width direction of the first phase difference layer 12 a ₁ . At each width-direction end of the optical laminated body 70a, the width-direction distance from the end position of the adhesive layer 30a to the end position of the first retardation layer _12a1 is usually 0.3 cm or more, and may be 0.5cm or more, may be 1.0cm or more, and is usually 20cm or less, preferably 15cm or less, preferably 10cm or less. The distances may be the same or different from each other at both ends of the optical laminate 70a in the width direction.

As shown in FIG. 1 , the width-direction both ends of the optical film adhesive layer 62 a of the optical layered body 70 a are further to the outside in the width direction than the width-direction ends of the adhesive layer 30 a and the second retardation layer 22 a ₁ . As shown in FIG. 1, in the optical laminated body 70a, it is preferable that the position of both ends in the width direction of the adhesive layer 30a and the position of both ends in the width direction of the second phase difference layer _22a1 are the same.

At each end of the optical laminate 70a in the width direction, the distance in the width direction from the respective end positions of the adhesive layer 30a and the second retardation layer _22a1 to the end position of the optical film adhesive layer 62a is respectively It is usually 0.3cm or more, and may be 0.5cm or more, or 1.0cm or more. It is usually 20cm or less, preferably 15cm or less, and 10cm or less is more preferred. The distances may be the same or different from each other at both ends of the optical laminate 70a in the width direction.

As shown in FIG. 1 , in the optical laminated body 70 a , the width-direction both end positions of the optical film adhesive layer 62 a can be made the same as the width-direction both end positions of the first retardation layer 12 a ₁ .

As shown in FIG. 1 , in the optical laminated body 70 a , the width-direction both end positions of the optical film adhesive layer 62 a can be positioned closer to the width-direction inner side than the width-direction both end positions of the optical film 60 a.

At each end of the optical laminated body 70a in the width direction, the distance in the width direction from the end position of the optical film adhesive layer 62a to the end position of the optical film 60a is usually 0.3 cm or more, and may be 0.5 cm. cm or more, and may be 1.0 cm or more, and is usually 20 cm or less, preferably 15 cm or less, and preferably 10 cm or less. The distances may be the same or different from each other at both ends of the optical laminate 70a in the width direction.

In the optical laminated body 70a, the width-direction both ends of the adhesive layer 30a are closer to the width-direction inner side than the width-direction both ends of the first retardation layer _12a1 , and the width-direction both ends of the optical film adhesive layer 62a are The position is closer to the width direction outer side than the respective width direction end positions of the adhesive layer 30a and the second phase difference layer 22a ₁ . Therefore, as shown in FIG. 1, the optical film adhesive layer 62a and the first retardation layer 12a ₁ can be bonded to the end portion of the optical laminated body 70a. In addition, in the optical laminated body 70a shown in FIG. 1, both ends in the width direction of the first retardation layer 12a and both ends in the width direction of the optical film adhesive layer 62a are shown to be separated from each other. Since each layer of the body 70a is very thin, the width direction ends of the optical film adhesive layer 62a on the outside of the width direction are closer to the width direction ends of the adhesive layer 30a and the second retardation layer 22a ₁ than the first phase difference layer 22a. Both ends in the width direction of the difference layer 12a ₁ are in a state of being easily adhered.

In the optical laminated body 70a shown in FIG. 1, the optical film 60a and the first retardation layer 12a ₁ can also be laminated via the optical film adhesive layer 62a. Thereby, in the optical laminated body with a base material layer 71a (FIG. 2, FIG. 4(b)) obtained when manufacturing the optical laminated body 70a mentioned later, it is possible to use the optical film adhesive layer 62a as the The length of the regions located closer to the outside in the width direction at both ends in the width direction becomes relatively shorter in the width direction than the length of the corresponding region of the optical layered body 71p with a base material layer shown in FIG. 6(b). . Thereby, it is possible to suppress deformation such as bending and reflection in the regions that are located outside both widthwise ends of the optical film adhesive layer 62a of the optical laminated body 71a with a base material layer, and to suppress the optical laminated body 70a from being deformed. Poor appearance.

Furthermore, in the optical laminated body 70a shown in FIG. 1, the width-direction both end positions of the optical film adhesive layer 62a are closer to the width-direction inner side than the width-direction both end positions of the optical film 60a, and are separated from the first retardation layer. 12a ₁ has the same position at both ends in the width direction. Therefore, when the optical laminated body 70a is conveyed, it can be suppressed that the optical film adhesive layer 62a is extruded to the outside in the width direction, and therefore it can be suppressed that a part of the optical film adhesive layer 62a adheres to the conveyance path and contaminates the conveyance path. .

The optical laminated body of this embodiment can also be changed into the modification shown below. In addition, the above-described embodiments and modifications shown below may be arbitrarily combined.

(Modification 1 of the first embodiment)

In the optical laminated body of this embodiment, you may further include a 1st base material layer on the side of the 1st retardation layer opposite to the adhesive layer. Hereinafter, the optical laminated body including the first base material layer may be specifically referred to as an “optical laminated body with a base material layer”.

Fig. 2 is a schematic cross-sectional view showing an example of the optical laminated body 71a (optical laminated body) with a base material layer. Hereinafter, the same components as those shown in FIG. 1 are denoted by the same reference numerals and their descriptions are omitted. The optical laminated body 71a with a base material layer includes a first base material layer 11a, a first retardation layer 12a, an adhesive layer 30a (first adhesive layer), a second retardation layer 22a ₁ , and an optical film adhesive layer in this order. 62a (second adhesive layer), and optical film 60a (resin film).

As shown in FIG. 2 , in the optical laminated body 71 a with a base material layer, the positions of both widthwise ends of the adhesive layer 30 a are closer to the widthwise inner side than the positions of both widthwise ends of the first retardation layer 12 a . At each end of the optical laminated body 71a with a base material layer in the width direction, the distance in the width direction from the end position of the adhesive layer 30a to the end position of the first retardation layer 12a is usually 0.5 cm or more. , may be 0.7cm or more, may be 1.0cm or more, and is usually 20cm or less, preferably 15cm or less, preferably 10cm or less. The distances may be the same or different at both ends of the first phase difference layer 12a in the width direction.

As shown in FIG. 2 , the optical laminated body 71 a with a base material layer is configured such that the position of both ends of the optical film adhesive layer 62 a in the width direction is the same as or smaller than the position of both ends of the first retardation layer 12 a in the width direction. It is better to be closer to the inside in the width direction. When the width-direction end positions of the optical film adhesive layer 62a are further outside than the width-direction end positions of the first retardation layer 12a, the optical film adhesive layer 62a is bonded to the first base material layer 11a to produce a product as described below. In the optical laminate method, it is difficult to peel off the first base material layer 11a.

As shown in FIG. 2 , the optical laminated body 71 a with a base material layer is configured such that the positions of both width direction ends of the first base material layer 11 a are positioned closer to the width direction outer side than the positions of both width direction ends of the first retardation layer 12 a. Better. At each width-direction end of the optical laminated body 71a with a base material layer, the width-direction distance from the end position of the first retardation layer 12a to the end position of the first base material layer 11a is usually: 0.3cm or more, may be 0.5cm or more, may be 1.0cm or more, and is usually 20cm or less, preferably 15cm or less, preferably 10cm or less. Attached The distances between both ends of the optical laminate 71a in the width direction of the base material layer may be the same or different from each other.

In the optical laminated body 71a with a base material layer shown in FIG. 2, the width-direction both end positions of the adhesive layer 30a are closer to the width-direction inner side than the width-direction both end positions of the first retardation layer 12a, and the optical film is used for The width-direction both end positions of the adhesive layer 62a are further to the outside in the width direction than the width-direction end positions of the adhesive layer 30a and the second phase difference layer 22a ₁ respectively. Therefore, as shown in FIG. 2 , the optical film adhesive layer 62 a and the first retardation layer 12 a can be bonded together through the first end portion of the optical laminated body 71 a with the base material layer. Moreover, in the optical laminated body 71a with a base material layer shown in FIG. 2, the optical film 60a and the 1st retardation layer 12a can also be bonded via the optical film adhesive layer 62a. Thereby, in the optical laminated body 71a with the base material layer, the length of the region existing further outside in the width direction than both ends of the optical film adhesive layer 62a in the width direction can be changed to a length longer than that shown in FIG. 6(b). ) shows that the length of the region corresponding to the above of the base material layer-attached optical laminate 71p becomes relatively shorter in the width direction. This makes it possible to suppress deformation such as bending or reflection in regions that are located outside the widthwise ends of the optical film adhesive layer 62a of the optical laminate with base material layer 71a.

In the optical laminated body 71a with a base material layer shown in FIG. 2, the width-direction both end positions of the optical film adhesive layer 62a are closer to the width-direction inner side than the width-direction both end positions of the optical film 60a, and are closer to the first The positions of both ends of the retardation layer 12a in the width direction are the same or closer to the inner side in the width direction. Therefore, when the optical laminated body 71a is conveyed, it is possible to suppress the optical film adhesive layer 62a from being extruded to the outside in the width direction. Therefore, it is possible to suppress a part of the optical film adhesive layer 62a from adhering to the conveyance path and contaminating the conveyance path. .

(Modification 2 of the first embodiment)

At one end of the optical laminate 70a in the width direction of the optical laminate of this embodiment, the end position of the first adhesive layer may be closer to the inside in the width direction than the end position of the first liquid crystal layer, and the end of the second adhesive layer may be The end position may be further outside in the width direction than the end position of the first adhesive layer and the end position of the second liquid crystal layer. In this case, at the one end portion, it is possible to suppress deformations such as bending and reflection of the optical laminate with a base material layer for obtaining the optical laminate, and to suppress appearance defects of the optical laminate.

(Modification 3 of the first embodiment)

In the optical laminated body of this embodiment, the width-direction both end positions of the optical film adhesive layer may be the same as the width-direction both end positions of the optical film 60a. Thereby, when the optical laminated body 70a is conveyed, it can also suppress that the adhesive layer 62a for optical films is extruded to the outside in the width direction, Therefore, it can suppress that a part of the adhesive layer 62a for optical films adheres to the conveyance path and contaminates the conveyance path. situation.

(Modification 4 of the first embodiment)

The optical laminated body of this embodiment may also include an adhesive layer for an optical film and a release film (resin film) for protecting the adhesive layer for the optical film, an adhesive layer for an optical laminated body and an adhesive layer for protecting the optical laminated body which will be described later. A release film (resin film) is used to replace the optical film with an adhesive layer and optical film. The release film can be provided with an adhesive layer for an optical film or an adhesive layer for an optical laminated body on its release-processed surface, and the adhesive layer for an optical film or an optical laminated body can be transferred to the second retardation layer and then peeled off. An optical film can be laminated on the adhesive layer for optical films exposed by peeling off the release film. In addition, the adhesive layer for an optical laminated body exposed by peeling off the release film can be used when bonding it to a display panel such as an organic EL display device or a liquid crystal display device.

(Modification 5 of the first embodiment)

In the optical laminated body 70a described above, the adhesive layer for the optical laminated body may be provided on the side opposite to the adhesive layer 30a of the first retardation layer _12a1 . The adhesive layer system for optical laminates can be used when bonded to display panels such as organic EL display devices and liquid crystal display devices. In addition, when the adhesive layer for the optical laminated body is provided on the second retardation layer 22a ₁ , the optical film may be provided on the first retardation layer 12a ₁ opposite to the adhesive layer 30a via the adhesive layer for optical film. side.

[Second Embodiment (Method for Manufacturing Optical Laminated Body)]

3 (a) to (d) are partial schematic cross-sectional views schematically showing an example of the manufacturing steps of the optical laminated body according to this embodiment. FIG. 4 (a) to (c) are schematic views schematically showing the subsequent steps of manufacturing the optical laminated body shown in FIG. 3 . In the figure, W represents the width direction.

The manufacturing method of the optical laminated body 70a includes the following steps: preparing the first base material layer 11a, the first retardation layer 12a (the first liquid crystal layer), the adhesive layer 30a (the first adhesive layer), and the second phase in this order. The step of preparing the retardation film 50a (liquid crystal film) of the difference layer 22a ₁ (second liquid crystal layer) (Fig. 4 (a)); the step of preparing the optical film 60a (resin film) (Fig. 4 (a)); and The step of bonding the optical film 60a to the second retardation layer 22a side of the retardation film _50a via the optical film adhesive layer 62a (second adhesive layer) to obtain the optical laminated body 71a with a base material layer (4th step) Figure (b)).

Here, as shown in FIG. 4(a) , at both ends of the retardation film 50a in the width direction, the positions of both ends of the adhesive layer 30a in the width direction are closer to the positions in the width direction than the positions of both ends of the first retardation layer 12a in the width direction. The inner side is the same as the position of both ends in the width direction of the second retardation layer 22a _1. As shown in FIG. 4(b), the positions of both ends in the width direction of the optical film adhesive layer 62a of the optical laminated body 71a with a base material layer are the same. It is located farther outside in the width direction than the width direction both end positions of the adhesive layer 30a and the width direction both end positions of the second phase difference layer _22a1 .

In the manufacturing method of the optical laminated body 70a, the step of preparing the retardation film 50a includes the following steps: the step of preparing the first laminated part 10a and the second laminated part 20a (Fig. 3 (a) and (b)); The step of bonding the first retardation layer 12a of the first lamination part 10a and the second retardation layer 22a of the second lamination part 20a to obtain the retardation laminate 40a (liquid crystal laminate) by adhering the layer 30a ( Figure 3 (c)); and the step of obtaining the retardation film 50a by peeling off the first peeling layer including the second base material layer 21a from the retardation laminate 40a; the aforementioned second retardation layer 22a ₁ It is a layer formed by the second retardation layer 22a. As shown in FIG. 3(c), the positions of both ends in the width direction of the bonding layer 30a of the retardation laminated body 40a are two ends in the width direction of the first retardation layer 12a. The ends may be closer to the inside in the width direction, and may be closer to the inside in the width direction than the positions of both ends in the width direction of the second phase difference layer 22a.

The positions of both ends in the width direction of the optical film adhesive layer 62a of the optical laminated body 71a with a base material layer may be closer to the inside in the width direction than the positions of both ends in the width direction of the first retardation layer 12a, or may be wider than the width of the optical film 60a. The two ends of the direction are closer to the inside in the width direction. In the optical laminated body 71a with a base material layer, both widthwise ends of the first retardation layer 12a and both widthwise ends of the optical film 60a may be bonded together via the optical film adhesive layer 62a.

The manufacturing method of the optical laminated body 70a may also include the step of peeling off the second release layer including the first base material layer 11a from the optical laminated body 71a with the base material layer (Fig. 4(c)). By peeling off the second peeling layer from the optical laminated body 71a with the base material layer, it is possible to obtain an optical film having the first retardation layer 12a ₁ and having both end positions in the width direction of the first retardation layer 12a ₁ bonded to the optical film. The optical laminated body 70a has the same position at both ends of the layer 62a in the width direction.

The manufacturing method of the optical laminated body 70a may include the step of forming an optical laminated body adhesive layer on the first retardation layer 12a ₁ of the optical laminated body 70a.

Hereinafter, a specific description will be given based on the drawings. The optical laminated body 71a shown in FIG. 4(b) is the same as the optical laminated body 71a with a base material layer shown in FIG. 2. The optical laminated body 70a shown in FIG. 4(c) is the same as the optical laminated body 70a shown in FIG. 1. The laminated body 70 a is the same. Therefore, in the following, those components that are the same as the optical laminated body shown in FIGS. 1 and 2 and the members constituting the optical laminated body will be given the same reference numerals and their description will be omitted.

In the manufacturing method of the optical laminated body 71a, first, the first laminated part 10a including the first base material layer 11a and the first retardation layer 12a is prepared as shown in Fig. 3(a), and as shown in Fig. 3(b) The second laminate portion 20a including the second base material layer 21a and the second retardation layer 22a is shown. The first stacking unit 10a and the second stacking unit 20a are elongated film-shaped objects, and the steps described below are performed while continuously conveying the first stacking unit 10a and the second stacking unit 20a. The width direction W is a direction orthogonal to the longitudinal direction of the film-like object.

Next, the first phase difference layer 12a of the first build-up part 10a and the second phase difference layer 22a of the second build-up part 20a are laminated via the adhesive layer 30a to obtain the phase difference build-up layer shown in FIG. 3(c) Body 40a. Subsequently, the retardation film 50a shown in FIG. 3(d) is obtained by peeling the 2nd base material layer 21a (1st peeling layer) from the retardation laminated body 40a.

Although the position of both ends of the first base material layer 11a in the width direction of the first laminated part 10a is shown to be further outside than the position of both ends of the first retardation layer 12a in the width direction, it may be The positions of both ends in the width direction of the first phase difference layer 12a are the same. As shown in FIG. 3(b) , although the positions of both ends of the second base material layer 21a in the width direction of the second laminate part 20a are further outside than the positions of both ends of the second retardation layer 22a in the width direction, The positions of both ends in the width direction of the second phase difference layer 22a may be the same.

As shown in FIG. 3(c) , the width-direction both ends of the adhesive layer 30a of the phase difference laminated body 40a are closer to the width-direction inner side than the width-direction both ends of the first phase difference layer 12a, and are further inward than the width-direction ends of the second phase difference laminated body 40a. Both ends of the difference layer 22a in the width direction are positioned closer to the inside in the width direction. The positions of both ends in the width direction of the subsequent layer 30a are not particularly limited. For example, it can be a region of 0.2 cm or more inward in the width direction from the end position of the first retardation layer 12a or the second phase difference layer 22a in the width direction, or it can be a region of 0.5 cm or more, or it can be a region of 0.5 cm or more. The area is more than 1.0cm, and usually the area is less than 20cm, preferably the area is less than 15cm.

The retardation film 50a can be obtained by peeling the 2nd base material layer 21a (1st peeling layer) from the retardation laminated body 40a. The retardation film 50a has the 1st base material layer 11a, the 1st retardation layer 12a, the adhesive layer 30a, and the 2nd retardation layer _22a1 in the width direction cross section. In the cross-section in the width direction of the retardation film 50a, the position of both ends in the width direction of the adhesive layer 30a is the same as the position of both ends in the width direction of the second retardation layer _22a1 .

When the second base material layer 21a is peeled off from the retardation laminate 40a shown in Figure 3(c), a part of the second retardation layer 22a is easily transferred to the second base material layer as shown in Figure 3(d). 21a. In the retardation laminated body 40a shown in FIG. 3(c), the positions of both ends of the second retardation layer 22a in the width direction are closer to the outside than the positions of both ends of the adhesive layer 30a in the width direction, because the second retardation layer 22a has an unfixed area (a portion shown with a diagonal line rising to the right in FIG. 3(c)) that is not fixed to the adhesive layer 30a. Therefore, when the second base material layer 21a is peeled off from the retardation laminated body 40a, the second retardation layer 22a shown in Fig. 3(c) is separated into a region fixed to the adhesive layer 30a (Fig. 3(d) ), and the non-fixed area transferred to the second base material layer _21a (the portion shown with a diagonal line rising to the right in Figure 3 (c) and (d)), as shown in Figure 3 FIG. 3(d) shows that the retardation film 50a can be obtained in which the positions of both ends in the width direction of the second retardation layer _22a1 are the same as the positions of both ends in the width direction of the adhesive layer 30a.

As shown in FIG. 4(a) , the retardation film 50a and the optical film 60a obtained in the above steps are prepared. The retardation film 50a and the optical film 60a are long film-like objects, and the steps described below are performed while continuously conveying the retardation film 50a and the optical film 60a.

As shown in FIG. 4(b), by laminating the optical film 60a on the second retardation layer 22a ₁ of the retardation film 50a via the optical film adhesive layer 62a, it is possible to obtain the results described in the previous embodiment. Optical laminated body 71a with base material layer (optical laminated body). At this time, the optical film adhesive layer 62a may be provided on the optical film 60a in advance and the optical film adhesive layer 62a may be bonded to the second retardation layer 22a ₁ of the retardation film 50a, or the optical film adhesive layer 62a may be bonded together. The adhesive layer 62a is previously provided on the second retardation layer 22a ₁ of the retardation film 50a, and the optical film adhesive layer 62a and the optical film 60a are bonded together.

As shown in FIG. 4(b) , the width-direction both end positions of the optical film adhesive layer 62a of the optical laminated body 71a with a base material layer are closer to the width-direction outer than the width-direction both ends of the adhesive layer 30a, and are larger than the width-direction both ends of the adhesive layer 30a. Both width direction end positions of the second retardation layer 22a ₁ are closer to the width direction outer side and are closer to the width direction inner side than the width direction both end positions of the first retardation layer 12 a .

Therefore, the optical film adhesive layer 62a and the first retardation layer 12a can be bonded to both ends in the width direction of the optical laminated body 71a with the base material layer, and the optical film adhesive layer 62a can also be interposed between the optical film adhesive layer 62a and the optical film adhesive layer 62a. The thin film 60a and the first retardation layer 12a are laminated. By this, in the optical product In the manufacturing method of the layer body 70a, it is possible to suppress deformation such as bending or reflection in the regions of the optical laminate 71a with a base material layer that are located outside the widthwise ends of the optical film adhesive layer 62a. situation. As a result, appearance defects of the optical laminated body 70a obtained by the manufacturing method of the optical laminated body 70a can also be suppressed.

The optical laminated body 70a can be obtained by peeling the 1st base material layer 11a (2nd peeling layer) from the said optical laminated body 71a with a base material layer (FIG. 4(c)). In the optical laminated body 71a with a base material layer, as shown in FIG. 4(b), the width-direction both end positions of the optical film adhesive layer 62a are closer to the width direction than the width-direction both end positions of the first retardation layer 12a. direction inward. Therefore, since the optical film adhesive layer 62a is not bonded to the first base material layer 11a, the first base material layer 11a can be easily peeled off. As shown in FIG. 4(c), the optical laminated body 70a obtained in this way has the first retardation layer 12a ₁ , the adhesive layer 30a, the second retardation layer 22a ₁ , the optical film adhesive layer 62a, and and the optical film 60a are laminated.

When the first base material layer 11a is peeled off from the base material layer-attached optical laminated body 71a shown in FIG. 4(b), as shown in FIG. 4(c), a part of the first retardation layer 12a is easily transferred to the base layer after peeling. the first base material layer 11a. This is because in the cross-section in the width direction of the optical laminated body 71a with a base material layer shown in FIG. Both ends are positioned closer to the outside, and the first retardation layer 12a has an unfixed area (the portion shown with a diagonal line rising to the right in Figure 4(b)) that is not fixed to the optical film adhesive layer 62a. . In the optical laminated body 71a with a base material layer shown in FIG. 4(b) , both widthwise ends of the first retardation layer 12a are separated from both widthwise ends of the optical film adhesive layer 62a. However, since each layer constituting the optical laminate 71a with a base material layer is very thin, in fact, both ends of the first retardation layer 12a in the width direction are in contact with the optical film adhesive layer. Both ends in the width direction of 62a are in contact with each other.

Therefore, when the first base material layer 11a is peeled off from the base material layer-attached optical laminate 71a, the first retardation layer 12a shown in FIG. 4(b) is separated into a region fixed to the optical film adhesive layer 62a. (The first retardation layer 12a ₁ shown in Figure 4(c)), and the non-fixed area transferred to the first base material layer 11a (shown with diagonal lines rising to the right in Figures 4(b) and (c) part), as shown in Figure 4 (c), it can be obtained that in the width direction cross-section, the width direction both end positions of the first retardation layer 12a ₁ are the same as the width direction both end positions of the optical film adhesive layer 62a Optical laminated body 70a.

The manufacturing method of the optical laminated body 70a may include the step of forming an adhesive layer for the optical laminated body (not shown) on the first retardation layer 12a ₁ exposed by peeling off the first base material layer 11a. The adhesive layer system for optical laminates can be used when bonded to display panels such as organic EL display devices and liquid crystal display devices.

The manufacturing method of the optical laminated body of this embodiment can also be changed into the modification shown below. In addition, the above-described embodiments and modifications shown below may be arbitrarily combined.

(Modification 1 of the second embodiment)

In the manufacturing method of the optical laminated body 70a of this embodiment, it is also possible to prepare, for example, the retardation film 50a shown in FIG. The end position is a retardation film that is closer to the width direction inner side than the first retardation layer 12a and is the same as the width direction both ends of the second retardation layer 22a ₁ , and an optical laminated body is manufactured using this retardation film.

(Modification 2 of the second embodiment)

In the manufacturing method of the optical laminated body 70a of this embodiment, in the width direction of each of the retardation laminated body 40a, the retardation film 50a, the optical laminated body with a base material layer 71a, and the optical laminated body 70a. The positional relationship of each layer can be set to the above-mentioned relationship at one end on the same side. Furthermore, at this one end, it is possible to prevent the optical laminate with a base material layer from being deformed such as bending or refraction, thereby suppressing a defective appearance of the optical laminate, and also suppressing the deformation of the base material layer. Unstabilizing the transportation of optical laminates.

(Modification 3 of the second embodiment)

In the manufacturing method of the optical laminated body 70a of this embodiment, the width-direction both end positions of the optical film adhesive layer 62a and the width-direction both end positions of the optical film 60a may be the same. Thereby, when the optical laminated body 70a is conveyed, the optical film adhesive layer 62a can be suppressed from being extruded to the outside in the width direction. Therefore, a part of the optical film adhesive layer 62a can be restrained from adhering to the conveyance path and contaminating the conveyance path.

(Modification 4 of the second embodiment)

In the manufacturing method of the optical laminated body 70a of this embodiment, it is also possible to use the adhesive layer 62a for the optical film and the release film (resin film) for protecting the adhesive layer 62a for the optical film, the adhesive layer for the optical laminated body and the adhesive layer for protecting the optical film 70a. The release film (resin film) of the adhesive layer of the laminated body is used instead of the optical film adhesive layer 62a and the optical film 60a.

When a release film is used to protect the optical film adhesive layer 62a, the manufacturing method of the optical laminate further includes the following steps, whereby an optical laminate with a base material layer can be obtained: disposing the optical film adhesive layer 62a on the release film. The step of peeling off the surface; the step of laminating the peeling film provided with the optical film adhesive layer 62a on the retardation film 50a so that the optical film adhesive layer 62a side faces the second retardation layer _22a1. ; the step of peeling off the release film and transferring the optical film adhesive layer 62a to the second retardation layer 22a ₁ of the retardation film 50a; and between the optical film adhesive layer 62a and the second retardation layer 22a ₁ The step of laminating the optical film 60a on the opposite side.

When using a release film that protects the adhesive layer for an optical laminated body, the manufacturing method of the optical laminated body may include the following steps: providing the adhesive layer for the optical laminated body on the release-processed surface of the release film; and placing the adhesive layer for the optical laminated body on the release-processed surface. The step of laminating the release film of the next layer on the retardation film 50a so that the adhesive layer side of the optical laminate faces the second retardation layer _22a1 . At this time, the optical film can be provided on the first retardation layer 12a ₁ exposed by peeling off the first base material layer 11a via the optical film adhesive layer.

The embodiments and modifications of the present invention have been described above. However, the present invention is not limited to these embodiments and modifications. For example, the structures and steps of the above-described embodiments and modifications can also be combined and implemented. . Hereinafter, matters common to all embodiments and modifications thereof will be described in detail.

(1st base material layer and 2nd base material layer)

The first base material layer and the second base material layer have a function as a support layer that supports the first alignment layer and the second alignment layer, and the first liquid crystal layer and the second liquid crystal layer that are later formed on the base material layers. The first base material layer and the second base material layer are preferably thin films formed of a resin material.

As the resin material, for example, a resin material having excellent transparency, mechanical strength, thermal stability, extensibility, etc. can be used. Specific examples include: polyolefin-based resins such as polyethylene and polypropylene; cyclic polyolefin-based resins such as norbornene-based polymers; polyethylene terephthalate, polyethylene naphthalate, etc. Polyester resins; (meth)acrylic resins such as (meth)acrylic acid and polymethyl (meth)acrylate; cellulose esters such as cellulose triacetate, cellulose diacetate, and cellulose acetate propionate Vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate Acid ester resin; polystyrene resin; polyarylate resin; polystyrene resin; polyether sulfide resin; polyamide resin; polyimide resin; polyetherketone resin; polyphenylene sulfide Ether resins; polyphenylene ether resins, and mixtures and copolymers of these resins. Among these resins, it is preferable to use any one of cyclic polyolefin resin, polyester resin, cellulose ester resin, and (meth)acrylic resin or a mixture of these resins. Moreover, the above-mentioned "(meth)acrylic acid" means "at least one of acrylic acid and methacrylic acid".

The first base material layer and the second base material layer may be a single layer formed by mixing one type of resin or two or more types of resin, or may be a multilayer structure having two or more layers. When having a multi-layer structure, the resins constituting each layer may be the same or different from each other.

Optional additives may be added to the resin material constituting the film formed of the resin material. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.

The thickness of the first base material layer and the second base material layer is not particularly limited. Generally, in terms of workability such as strength and workability, 1 to 500 μm is preferred, 1 to 300 μm is more preferred, and 5 to 500 μm is preferred. 200μm is better.

When the first built-up part has a first alignment layer described below, or when the second build-up part has a second alignment layer described below, in order to ensure the adhesion between the first base material layer and the first alignment layer, and the second base material layer To improve the adhesion with the second alignment layer, corona treatment can also be performed on at least the surface of the first base material layer on the side forming the first alignment layer and at least the surface of the second base material layer on the side forming the second alignment layer. , plasma treatment, flame treatment, etc., and can also form a primer layer, etc. In addition, it is also possible to adjust the composition of the alignment layer forming composition used to form the first alignment layer and the second alignment layer, and to form the first liquid crystal layer and the second alignment layer. The above-mentioned adhesiveness is adjusted by the components of the liquid crystal layer forming composition used for 2 liquid crystal layers.

(1st alignment layer and 2nd alignment layer)

The first lamination part may include a first alignment layer between the first base material layer and the first liquid crystal layer. Furthermore, the second lamination part may include a second alignment layer between the second base material layer and the second liquid crystal layer.

The first alignment layer and the second alignment layer have an alignment regulating force that causes the liquid crystal compound contained in the first liquid crystal layer and the second liquid crystal layer formed on the alignment layers to align the liquid crystal in a desired direction. Examples of the first alignment layer and the second alignment layer include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a layer having a concavo-convex pattern on its surface. Or a trench alignment layer with a plurality of grooves. The first alignment layer and the second alignment layer can be the same type of layer or different types of layers. The thickness of the first alignment layer and the second alignment layer is usually 10 to 500 nm, preferably 10 to 200 nm.

The alignment polymer layer can be coated on a base material layer (first base material layer or second base material layer) with a composition in which an alignment polymer is dissolved in a solvent, and the solvent can be removed and added as necessary. It is formed by rubbing treatment. At this time, in the alignment polymer layer formed of the alignment polymer, the alignment restriction force can be arbitrarily adjusted by the surface state of the alignment polymer and friction conditions.

The photo-alignable polymer layer can be formed by coating a composition containing a polymer with a photoreactive group or a monomer and a solvent on the base material layer (the first base material layer or the second base material layer), and It is formed by irradiating polarized light. At this time, in the photo-alignment polymer layer, the alignment restriction force can be arbitrarily adjusted by polarized light irradiation conditions of the photo-alignment polymer.

The trench alignment layer can be formed, for example, by exposing and developing the surface of the photosensitive polyimide film through an exposure mask having pattern-shaped slits to form concavities. Method of convex pattern; forming an uncured layer of active energy ray curable resin on a plate-shaped original plate with grooves on the surface, and transferring this layer to a base material layer (first base material layer or second base material layer). Its hardening method; and forming an unhardened layer of active energy ray curable resin on the base material layer (the first base material layer or the second base material layer), and by pushing the roll-shaped original plate with unevenness against the base material layer (the first base material layer or the second base material layer). Methods such as forming uneven layers and hardening them.

The first peeling layer and the second peeling layer may also include a first alignment layer and a second alignment layer. That is, when the first release layer includes the second base material layer, the first release layer may also include the second alignment layer. Similarly, when the second release layer includes the first base material layer, the second release layer may also include the first alignment layer. The same applies when the first release layer includes the first base material layer and when the second release layer includes the second base material layer. In addition, when the first peeling layer does not include the first alignment layer or the second alignment layer, after the first peeling layer is peeled off, the first alignment layer or the second alignment layer may remain on the first liquid crystal layer or the second liquid crystal layer respectively. superior. Similarly, when the second peeling layer does not include the first alignment layer or the second alignment layer, after the second peeling layer is peeled off, the first alignment layer or the second alignment layer can remain on the first liquid crystal layer or the second alignment layer respectively. on the liquid crystal layer. In addition, the layers included in the first release layer and the second release layer can be set by adjusting the relationship between the adhesion forces between the respective layers, for example, by performing the above-mentioned test on the first base material layer and the second base material layer. The corona treatment, plasma treatment, flame treatment, components of the primer layer, the composition for forming the alignment layer, the components of the composition for forming the liquid crystal layer, etc. are adjusted.

When the first alignment layer remains on the first liquid crystal layer, or when the second alignment layer remains on the second liquid crystal layer, the adhesive layer system for the optical laminate can be provided on the first alignment layer or the second alignment layer. . In addition, when the second alignment layer remains on the second liquid crystal layer, or when the first alignment layer remains on the first liquid crystal layer, the adhesive layer for the optical film can be provided on the second alignment layer or the first alignment layer. .

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

The first liquid crystal layer and the second liquid crystal layer can be formed using well-known liquid crystal compounds. The type of liquid crystal compound is not particularly limited, and rod-shaped liquid crystal compounds, disk-shaped liquid crystal compounds, and mixtures of these compounds can be used. Moreover, the liquid crystal compound may be a polymer liquid crystal compound, a polymerizable liquid crystal compound, or a mixture of these compounds. For example, when a polymerizable liquid crystal compound is used, a coating film can be formed by coating a composition containing the polymerizable liquid crystal compound on the alignment layer (the first alignment layer or the second alignment layer) and the coating film can be hardened. This forms a first liquid crystal layer or a second liquid crystal layer as a liquid crystal hardened layer. Alternatively, the liquid crystal compound may be coated on the base material layer (the first base material layer or the second base material layer) to form a coating film, and the coating film may be stretched together with the base material layer to form liquid crystal. layer (the first liquid crystal layer or the second liquid crystal layer).

The first liquid crystal layer and the second liquid crystal layer may be, for example, a first phase difference layer and a second phase difference layer respectively. The first retardation layer and the second retardation layer are not particularly limited as long as they impart a predetermined phase difference to light. Examples thereof include a 1/2-wavelength plate, a 1/4-wavelength plate, a positive C plate, Functional 1/4 wavelength plate with reverse wavelength dispersion.

In the optical laminated body of this embodiment, when the optical film is a polarizing film, the optical laminated system of this embodiment can be used as a composite polarizing plate. When the composite polarizing plate constitutes a circular polarizing plate, it is preferable that the layer structure of the composite polarizing plate is a structure in which a polarizing layer (linear polarizing layer), a 1/2 wavelength plate, and a 1/4 wavelength plate are laminated in sequence, or The first liquid crystal layer and the second liquid crystal layer (the first retardation layer and the second retardation layer) are formed by selecting a structural method of laminating a polarizing layer (linear polarizing layer), a reverse wavelength dispersion three-quarter wavelength plate, and a positive C plate. layer) type of liquid crystal layer.

(liquid crystal film)

The liquid crystal film system includes a first liquid crystal layer and a second liquid crystal layer. For example, when the first liquid crystal layer and the second liquid crystal layer are respectively a first phase difference layer and a second phase difference layer, they can be phase difference films.

(resin film)

Examples of the resin film include optical films and release films (separation films) that protect the adhesive layer. Examples of optical films include polarizing films, reflective films, semi-transmissive reflective films, brightness improvement films, optical compensation films, films with anti-glare functions, and the like. Moreover, it may have the same structure as the said retardation film (liquid crystal film). Examples of the release film include a film obtained by subjecting the surface of a base film to a silicone treatment plasma treatment. Examples of the resin material constituting the base film include the same resin materials constituting the first base material layer and the second base material layer. The resin film may have a 1-layer structure or may be a multi-layer resin film with a multi-layer structure of 2 or more layers.

(adhering layer)

The subsequent layer system can be formed of adhesives, pressure-sensitive adhesives, and combinations of these adhesives and adhesives. It is usually one layer, but may also be two or more layers. When the subsequent layer system is composed of two or more layers, each layer may be formed of the same material or may be formed of different materials.

As the adhesive, for example, one or two or more types of water-based adhesives, active energy ray-curable adhesives, adhesives, etc. can be combined. Examples of water-based adhesives include polyvinyl alcohol-based resin aqueous solutions, water-based two-component urethane-based emulsion adhesives, and the like. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with active energy rays such as ultraviolet rays. Examples thereof include those containing a polymerizable compound and a photopolymerizable initiator, those containing a photoreactive resin, and those containing Binder resin and photoreactive cross-linking agent, etc. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, or monomers derived from these. oligomers, etc. Examples of the photopolymerization initiator include those that generate neutral free radicals by irradiating active energy rays such as ultraviolet rays. Substances that are active species of radicals, anionic radicals, and cationic radicals.

Examples of the adhesive include those using (meth)acrylic resin, styrene resin, polysiloxane resin, etc. as a matrix polymer and adding a cross-linking agent such as an isocyanate compound, an epoxy compound, or an aziridine compound. into the composition.

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

(Adhesive layer for optical films)

The adhesive layer for optical films can be formed from adhesives, adhesives, and combinations of these adhesives and adhesives. The adhesive layer system for optical films is usually one layer, but may be formed of two or more layers. When the adhesive layer for an optical film is composed of two or more layers, each layer may be formed of the same material or may be formed of different materials.

Examples of the adhesives and adhesives constituting the adhesive layer for optical films include the same adhesives and adhesives used in the above-mentioned adhesive layers. As the adhesive layer for optical films, it is preferable to use an adhesive.

(Adhesive layer for optical laminates)

The adhesive layer system for an optical laminated body can be formed from an adhesive, an adhesive, and a combination of these adhesives and adhesives. The adhesive layer system for optical laminates is usually one layer, but may be formed of two or more layers. When the adhesive layer for an optical laminated body is composed of two or more layers, each layer may be formed of the same material or may be formed of different materials.

Examples of the adhesives and adhesives constituting the adhesive layer for an optical laminated body are the same as those used for the above-mentioned adhesive layers. As the adhesive layer for the optical film, it is preferable to use an adhesive.

12a ₁ ‧‧‧First phase difference layer (first liquid crystal layer)

22a ₁ ‧‧‧Second phase difference layer (second liquid crystal layer)

30a‧‧‧Adhesive layer (1st adhesive layer)

60a‧‧‧Optical film (resin film)

62a‧‧‧Adhesive layer for optical films (second adhesive layer)

70a‧‧‧Optical laminated body

W‧‧‧width direction

Claims (23)

An optical laminated body including a first liquid crystal layer, a first adhesive layer, a second liquid crystal layer, a second adhesive layer, and a resin film in this order, wherein at at least one end in the width direction of the optical laminated body, the first liquid crystal layer is The end position of the first adhesive layer is closer to the inside in the width direction than the end position of the first liquid crystal layer, and the end position of the second adhesive layer is farther than the end position of the first adhesive layer and the second liquid crystal layer. The end position of the layer is closer to the outside in the width direction. The optical laminated body according to claim 1, wherein at least one end in the width direction of the optical laminated body, further, the end position of the second adhesive layer is in contact with the end of the first liquid crystal layer. The position is the same as or closer to the inside in the width direction than it is. The optical laminated body according to claim 1 or 2, wherein at least one end in the width direction of the optical laminated body, further, the end position of the second adhesive layer is in contact with the end of the resin film. The position is the same or closer to the inside in the width direction. The optical laminated body according to claim 1 or 2, wherein at least one end in the width direction of the optical laminated body, further, the end of the first liquid crystal layer is spaced apart from the end of the resin film. Laminate to the aforementioned second bonding layer. The optical laminated body according to claim 1 or 2, wherein at both ends of the optical laminated body in the width direction, the end position of the first adhesive layer is farther than the end position of the first liquid crystal layer. Near the width direction inner side, the end position of the second adhesive layer is farther than the end position of the first adhesive layer and the front end position of the first adhesive layer. The end position of the second liquid crystal layer is closer to the outside in the width direction. The optical laminate according to claim 1 or 2, wherein the resin film is an optical film. The optical laminate according to claim 1 or 2, further comprising a first alignment layer on the side opposite to the first adhesive layer of the first liquid crystal layer. The optical laminated body according to claim 1 or 2, wherein the first liquid crystal layer includes an adhesive layer for an optical laminated body on a side opposite to the first adhesive layer. The optical laminated body according to claim 8, wherein a first alignment layer is included between the first liquid crystal layer and the adhesive layer for the optical laminated body. The optical laminate according to claim 1 or 2, further comprising a first base material layer on the side of the first liquid crystal layer opposite to the first adhesive layer. The optical laminated body according to claim 10, wherein at least one end in the width direction of the optical laminated body, further, the end position of the second adhesive layer is farther than the end of the first liquid crystal layer. The position is closer to the inside in the width direction. The optical laminate according to claim 10, further comprising a first alignment layer between the first liquid crystal layer and the first base material layer. The optical laminate according to claim 1 or 2, further comprising a second alignment layer between the second liquid crystal layer and the second adhesive layer. The optical laminated body according to claim 1 or 2, wherein the first liquid crystal layer is a retardation layer. The optical laminated body according to claim 1 or 2, wherein the second liquid crystal layer is a retardation layer. A method for manufacturing an optical laminated body, which includes the following steps: preparing a liquid crystal film having a first base material layer, a first liquid crystal layer, a first adhesive layer, and a second liquid crystal layer in this order; preparing a resin film; and The step of bonding the resin film to the second liquid crystal layer side of the liquid crystal film via a second adhesive layer to obtain an optical laminated body, wherein the first adhesive layer is attached to at least one end in the width direction of the liquid crystal film. The end position of the optical laminated body is closer to the inside in the width direction than the end position of the first liquid crystal layer, and is the same as the end position of the second liquid crystal layer. The end position of the optical laminate is closer to the end position of the second adhesive layer. It is further outside in the width direction than the end position of the first adhesive layer and the end position of the second liquid crystal layer. The method for manufacturing an optical laminated body as described in claim 16, wherein the step of preparing the liquid crystal film includes the following steps: preparing a first laminated portion including a first base material layer and a first liquid crystal layer; The step of the second lamination part of the second base material layer and the 2' liquid crystal layer; placing the first 'liquid crystal layer in the first lamination part and the second 'liquid crystal in the second lamination part through the first adhesive layer The step of laminating the layers to obtain a liquid crystal laminate; and the step of peeling the liquid crystal laminate from the first release layer including the second base layer to obtain the liquid crystal film; wherein the second liquid crystal layer It is a layer formed of the aforementioned 2' liquid crystal layer, and at least one end portion in the width direction of the aforementioned liquid crystal layer laminate, the end portion of the aforementioned first adhesive layer is positioned closer to the width than the end portion of the aforementioned 1' liquid crystal layer. direction inward, and 2' higher than the aforementioned The end position of the liquid crystal layer is closer to the inside in the width direction. The method for manufacturing an optical laminated body as described in claim 16 or 17, wherein at least one end of the optical laminated body in the width direction, further, the end position of the second adhesive layer is located farther than the first end of the optical laminated body. 'The end position of the liquid crystal layer is closer to the inside in the width direction. The manufacturing method of an optical laminated body as described in claim 16 or 17, wherein at least one end of the optical laminated body in the width direction, the end position of the second adhesive layer is aligned with the end of the resin film. The position is the same or closer to the inside in the width direction. The manufacturing method of an optical laminated body according to claim 16 or 17, wherein at both ends of the width direction of the liquid crystal film, the end position of the first adhesive layer is farther than the end position of the first liquid crystal layer. The position is closer to the inside in the width direction and is the same as the end position of the second liquid crystal layer. The end position of the second adhesive layer of the optical layered body is farther than the end position of the first adhesive layer and the second The end portion of the liquid crystal layer is positioned closer to the outside in the width direction. The method for manufacturing an optical laminated body described in claim 16 or 17 further includes the step of peeling off the second release layer including the first base material layer from the optical laminated body. The manufacturing method of an optical laminated body as described in claim 21 is a step of peeling off the second peeling layer to form a first liquid crystal layer from the first liquid crystal layer, and then peeling off the second peeling layer. Then, at least one end in the width direction of the optical laminated body, the end position of the first liquid crystal layer is the same as the end position of the second adhesive layer. The method for manufacturing an optical laminated body according to claim 16 or 17, wherein the resin film is an optical film.

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