CN110609350B

CN110609350B - Optical laminate and method for producing same

Info

Publication number: CN110609350B
Application number: CN201910506604.6A
Authority: CN
Inventors: 越野哲史
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2018-06-14
Filing date: 2019-06-12
Publication date: 2023-02-17
Anticipated expiration: 2039-06-12
Also published as: TWI815906B; JP2019215471A; KR20190141594A; TW202014744A; CN110609350A; JP7014418B2

Abstract

An optical laminate and a method for producing the same. The present invention provides an optical laminate comprising a1 st liquid crystal layer, a1 st adhesive layer, a 2 nd liquid crystal layer, a 2 nd adhesive layer, and a resin film in this order, wherein at least one end portion in a width direction of the optical laminate, a position of an end portion of the 1 st adhesive layer is located on an inner side in the width direction with respect to a position of an end portion of the 1 st liquid crystal layer, and a position of an end portion of the 2 nd adhesive layer is located on an outer side in the width direction with respect to a position of the end portion of the 1 st adhesive layer and a position of an end portion of the 2 nd liquid crystal layer.

Description

Optical laminate and method for producing same

Technical Field

The present invention relates to an optical laminate and a method for producing the same.

Background

In display devices such as organic EL display devices and liquid crystal display devices, members including optically anisotropic films such as polarizing films and phase difference films are used. As such an optically anisotropic film, an optically anisotropic film in which a layer of a liquid crystal compound is formed on a base film subjected to an 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 light-transmissive substrate film via an adhesive layer. JP2015-25947A1 discloses a laminate in which A1/2 wavelength retardation layer and A1/4 wavelength retardation layer formed using a liquid crystal material are laminated.

Disclosure of Invention

Problems to be solved by the invention

The invention aims to provide an optical laminate and a manufacturing method thereof, wherein appearance defects and the like are suppressed.

Means for solving the problems

The present invention provides an optical laminate and a method for producing the same.

[ 1 ] an optical laminate comprising a1 st liquid crystal layer, a1 st adhesive layer, a 2 nd liquid crystal layer, a 2 nd adhesive layer and a resin film in this order,

at least one end portion in the width direction of the optical layered body,

the position of the end of the 1 st adhesive layer is located on the inner side in the width direction with respect to the position of the end of the 1 st liquid crystal layer,

the position of the end of the 2 nd adhesive layer is located on the outer side in the width direction with respect to the position of the end of the 1 st adhesive layer and the position of the end of the 2 nd liquid crystal layer.

An optical laminate according to [ 1 ], wherein at least one end portion in a width direction of the optical laminate is located at the same position as or inside in the width direction of the end portion of the 1 st liquid crystal layer, at least one end portion in the width direction of the optical laminate, and wherein a position of the end portion of the 2 nd adhesive layer is located at the same position as or inside in the width direction of the end portion of the 1 st liquid crystal layer.

An optical laminate according to any one of [ 1 ] and [ 2 ], wherein at least one end portion of the optical laminate in a width direction, a position of an end portion of the 2 nd adhesive layer is the same as or inside the end portion of the resin film in the width direction.

An optical laminate according to any one of [ 1 ] to [ 3 ], wherein at least one end portion in a width direction of the optical laminate is bonded to an end portion of the resin film via the 2 nd adhesive layer, further wherein an end portion of the 1 st liquid crystal layer is bonded to an end portion of the resin film.

[ 5 ] the optical laminate according to any one of [ 1 ] to [ 4 ], wherein,

at both ends in the width direction of the optical laminate,

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

An optical laminate according to any one of [ 1 ] to [ 6 ], wherein a1 st alignment layer is included on a side of the 1 st liquid crystal layer opposite to the 1 st adhesive layer.

An optical laminate according to any one of [ 1 ] to [ 7 ], wherein an adhesive layer for an optical laminate is included on a side of the 1 st liquid crystal layer opposite to the 1 st adhesive layer.

An optical laminate according to [ 8 ], wherein a1 st alignment layer is provided between the 1 st liquid crystal layer and the adhesive layer for an optical laminate.

An optical laminate according to any one of [ 1 ] to [ 9 ], wherein a1 st base material layer is included on a side of the 1 st liquid crystal layer opposite to the 1 st adhesive layer.

An optical laminate according to [ 10 ], wherein at least one end portion of the optical laminate in a width direction, a position of an end portion of the 2 nd adhesive layer is located inward in the width direction with respect to a position of an end portion of the 1 st liquid crystal layer.

An optical laminate according to any one of [ 10 ] and [ 11 ], wherein a1 st alignment layer is provided between the 1 st liquid crystal layer and the 1 st base material layer.

An optical laminate according to any one of [ 1 ] to [ 12 ], wherein a 2 nd alignment layer is included between the 2 nd liquid crystal layer and the 2 nd adhesive layer.

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

An optical laminate according to any one of [ 1 ] to [ 14 ], wherein the 2 nd liquid crystal layer is a retardation layer.

[ 16 ] A method for producing an optical laminate, comprising:

preparing a liquid crystal film having a1 st base material layer, a1 st' liquid crystal layer, a1 st adhesive layer, and a 2 nd liquid crystal layer in this order;

a step for preparing a resin film; and

a step of laminating the resin film on the 2 nd liquid crystal layer side of the liquid crystal film with a 2 nd adhesive layer interposed therebetween to obtain an optical laminate (hereinafter, this optical laminate may be referred to as "optical laminate with a base material layer"),

at least one end portion in the width direction of the liquid crystal film,

the position of the end of the 1 st adhesive layer is located on the inner side in the width direction with respect to the position of the end of the 1 st' liquid crystal layer and is the same as the position of the end of the 2 nd liquid crystal layer,

the position of the end of the 2 nd adhesive layer of the optical laminate is located on the outer side in the width direction with respect to the position of the end of the 1 st adhesive layer and the position of the end of the 2 nd liquid crystal layer.

[ 17 ] the method for manufacturing an optical laminate according to [ 16 ], wherein the step of preparing the liquid crystal film comprises:

preparing a1 st laminated part including a1 st base material layer and a1 st' liquid crystal layer, and a 2 nd laminated part including a 2 nd base material layer and a 2 nd liquid crystal layer;

a step of obtaining a liquid crystal layer laminate by laminating the 1 st 'liquid crystal layer of the 1 st laminate section and the 2 nd' liquid crystal layer of the 2 nd laminate section with a1 st adhesive layer interposed therebetween; and

a step of obtaining the liquid crystal film by peeling a1 st peeling layer including the 2 nd base material layer from the liquid crystal layer laminate,

the 2 nd liquid crystal layer is a layer formed of the 2 nd liquid crystal layer,

at least one end of the liquid crystal layer laminate in the width direction thereof, the position of the end of the 1 st adhesive layer is located on the inner side in the width direction with respect to the end of the 1 st 'liquid crystal layer, and the position of the end of the 2 nd' liquid crystal layer is located on the inner side in the width direction.

The method for manufacturing an optical laminate according to any one of [ 16 ] and [ 17 ], wherein at least one end portion of the optical laminate in a width direction, a position of an end portion of the 2 nd adhesive layer is located inward in the width direction with respect to a position of an end portion of the 1 st' liquid crystal layer.

The method for producing an optical laminate according to any one of [ 16 ] to [ 18 ], wherein at least one end portion in the width direction of the optical laminate is located at the same position as or inside the end portion of the resin film as an end portion of the 2 nd adhesive layer.

The method for producing an optical laminate according to any one of [ 16 ] to [ 19 ], wherein the liquid crystal film is formed on both ends in the width direction,

in the optical layered body, a position of an end of the 2 nd adhesive layer is located outside a position of the end of the 1 st adhesive layer and a position of the end of the 2 nd liquid crystal layer in a width direction.

The method for producing an optical laminate according to any one of [ 16 ] to [ 20 ], further comprising a step of peeling a 2 nd peeling layer including the 1 st base material layer from the optical laminate.

[ 22 ] the method for producing an optical laminate according to [ 21 ], wherein a1 st liquid crystal layer is formed from a1 st' liquid crystal layer by a step of peeling the 2 nd peeling layer,

at least one end of the optical laminate in the width direction after the peeling of the 2 nd peeling layer has the same position as the end of the 2 nd adhesive layer in the 1 st liquid crystal layer.

The method for producing an optical laminate according to any one of [ 16 ] to [ 22 ], wherein the resin film is an optical film.

Effects of the invention

According to the present invention, an optical laminate in which appearance defects are suppressed, and a method for manufacturing the same can be provided.

Drawings

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

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

Fig. 3 (a) to (d) are schematic cross-sectional views schematically showing a part of an example of the process for producing the optical laminate of the present invention.

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

Fig. 5 (a) and (b) are schematic cross-sectional views schematically showing a part of an example of a process for producing an optical laminate that is a premise of the present invention.

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

Description of the symbols

10a 1 st laminate, 11a, 11p 1 st base material layer, 12a ₁ 、12p ₁ 1 st retardation layer (1 st liquid crystal layer), 20a 2 nd laminate, 21a, 21p 2 nd base material layer, 22a ₁ 、22p ₁ A 2 nd retardation layer (a 2 nd liquid crystal layer), a 30a, 30p adhesive layer (a 1 st adhesive layer), a 40a retardation layer laminate (a liquid crystal layer laminate), a 50a, 50p retardation film (a liquid crystal film), a 60a, 60p optical film (a resin film), an adhesive layer for a 62a, 62p optical film (a 2 nd adhesive layer), a 70a, 70p optical laminate, an optical laminate with a base material layer (an optical laminate) of 71a, 71p, and a W width direction.

Detailed Description

Before describing preferred embodiments of the optical laminate and the method for manufacturing the same according to the present invention, the premise of the embodiments of the present invention will be described.

Fig. 5 (a), (b), and fig. 6 (a) to (c) are schematic cross-sectional views schematically showing a manufacturing process of the optical laminate 70p, which will be a precondition of the embodiment described later.

In the figure, W represents the width direction. In the following description, a case where the 1 st liquid crystal layer and the 2 nd liquid crystal layer are respectively the 1 st retardation layer and the 2 nd retardation layer, and the liquid crystal film is a retardation film is exemplified.

In the method for producing the optical laminate 70p, as shown in fig. 5 (a), a retardation layer laminate 40p may be used in which a1 st laminated part 10p including a1 st base material layer 11p and a1 st retardation layer 12p and a 2 nd laminated part 20p including a 2 nd base material layer 21p and a 2 nd retardation layer 22p are laminated with an adhesive layer 30p interposed therebetween. When the 2 nd base material layer 21p is peeled from the retardation layer laminate 40p as shown in fig. 5 (b), a part of the 2 nd retardation layer 22p is transferred to the peeled 2 nd base material layer 21p, and the 2 nd retardation layer 22p is formed on the adhesive layer 30p ₁ The retardation film 50p. This is because the retardation layer laminate 40p shown in fig. 5 (a) has unfixed regions (portions indicated by the diagonal lines in fig. 5 (a) with lower left and higher right) which are not fixed to the adhesive layer 30p at both ends in the width direction of the 2 nd retardation layer 22p, and the 2 nd retardation layer 22p is separated into the 2 nd retardation layer 22p which is a region fixed to the adhesive layer 30p by peeling off the 2 nd base material layer 21p ₁ And a non-fixed region transferred to the 2 nd base material layer 21 p.

Then, the retardation film 50p (fig. 5 (b) and 6 (a)) and the optical film 60p obtained in the above-described manner are prepared, and as shown in fig. 6 (b), the retardation layer 22p of the 2 nd retardation layer 22p of the retardation film 50p is formed ₁ The optical film 60p is laminated with the optical film adhesive layer 62p interposed therebetween to obtain an optical laminate 71p with a base material layer. Thereafter, when the 1 st base material layer 11p included in the optical laminate 71p with a base material layer is peeled off, a part of the 1 st retardation layer 12p is transferred to the peeled 1 st base material layer 11p, and the 2 nd retardation layer 22p in the adhesive layer 30p is obtained ₁ The opposite side is formed with a1 st phase difference layer 12p ₁ The optical layered body 70p of (1) (fig. 6 (c)). This is because the retardation film 50p shown in fig. 6 (b) has unfixed regions (portions indicated by left-lower right-higher oblique lines in fig. 6 (b)) which are not fixed to the adhesive layer 30p at both ends in the width direction of the 1 st retardation layer 12p, and the 1 st retardation layer 12p is separated into the 1 st retardation layer 12p which is a region fixed to the adhesive layer 30p by peeling off the 1 st base material layer 11p ₁ And a non-fixed region transferred to the 1 st base material layer 11 p.

However, in the method for producing the optical laminate 70p, since the regions located further outside in the width direction than the width direction both ends of the adhesive layer 30p and the width direction both ends of the optical film adhesive layer 62p are not directly bonded to other layers with the adhesive layer 30p and the optical film adhesive layer 62p interposed therebetween, the optical laminate is more likely to be deformed than when directly bonded to other layers. Therefore, the longer these regions are present in the width direction, the more likely the optical layered body 70p is deformed such as bending (turning 1242812426. In particular, as shown in fig. 6 (b), the adhesive layer for an optical film in the optical laminate 71p with a base layer62p are opposed to the 2 nd retardation layer 22p at both ends in the width direction ₁ When both ends in the width direction of (b) are located on the inner side in the width direction, since the above-described regions are long in the width direction, deformation such as bending or warping is likely to occur in these regions. Such deformation may cause poor appearance of the optical laminate 71p with a base layer and the optical laminate 70p, and when the optical laminate 71p with a base layer having a deformed portion is wound in a roll, there may be a problem that an end portion of the roll is raised (raised). Further, the above-described region may be deformed, which may destabilize the conveyance of the optical laminate 71p with the base material layer.

Therefore, in the following embodiments, an optical laminate and a method for manufacturing the same will be described, in which deformation such as bending or warping in the region of the end in the width direction is suppressed, whereby defective appearance of the optical laminate or the optical laminate wound in a roll can be suppressed, and defective conveyance of the optical laminate can be suppressed.

Preferred embodiments of the optical laminate and the method for producing the same according to the present invention will be described below with reference to the drawings. In the following description, a case where the 1 st liquid crystal layer and the 2 nd liquid crystal layer are the 1 st retardation layer and the 2 nd retardation layer, respectively, and the liquid crystal film is a retardation film is exemplified.

Embodiment 1 (optical laminate)

Fig. 1 is a schematic cross-sectional view schematically showing an example of an optical laminate according to the present embodiment. In the figure, W represents the width direction. The optical laminate 70a of the present embodiment includes, for example, the 1 st retardation layer 12a in this order ₁ (1 st liquid crystal layer), adhesive layer 30a (1 st adhesive layer), and 2 nd retardation layer 22a ₁ An optical laminate 70a comprising (a 2 nd liquid crystal layer), an optical film adhesive layer 62a (a 2 nd adhesive layer), and an optical film 60a (a resin film),

at both ends in the width direction of the optical laminate 70a,

the position of the end of the adhesive layer 30a is opposite to the 1 st retardation layer 12a ₁ Are located at the widthwise inner sides,

end of the adhesive layer 62a for optical filmIs located outside in the width direction with respect to the position of the end of the adhesive layer 30a, and is located with respect to the 2 nd retardation layer 22a ₁ Is located at the widthwise outer side.

The position of the end of the optical film adhesive layer 62a may be the same as the position of the 1 st retardation layer 12a at both ends of the optical laminate 70a in the width direction W ₁ The positions of both ends of (a) are the same, and the positions of both ends may be located further inward in the width direction than the positions of the ends of the optical film 60a. Phase difference layer 1 12a ₁ Can be bonded to both ends in the width direction of the optical film 60a via the optical film adhesive layer 62 a.

The optical laminate 70a shown in fig. 1 may include the 1 st retardation layer 12a in this order ₁ Adhesive layer 30a, and 2 nd retardation layer 22a ₁ An optical film adhesive layer 62a, and an optical film 60a.

In the optical laminate 70a, as shown in fig. 1, the positions of both ends in the width direction of the adhesive layer 30a are opposite to the 1 st retardation layer 12a ₁ Are located on the inner side in the width direction. At each end in the width direction of the optical laminate 70a, the optical laminate extends from the position of the end of the adhesive layer 30a to the 1 st retardation layer 12a ₁ The distance in the width direction from the end portion of (a) 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, and more preferably 10cm or less. The distances may be the same or different at both ends of the optical layered body 70a in the width direction.

In the optical laminate 70a, as shown in fig. 1, the positions of both ends in the width direction of the adhesive layer 62a for an optical film are located with respect to the adhesive layer 30a and the 2 nd retardation layer 22a ₁ The positions of both ends in the width direction of each are located on the outer sides in the width direction. In the optical laminate 70a, as shown in fig. 1, it is preferable that the positions of both ends in the width direction of the adhesive layer 30a and the 2 nd retardation layer 22a are located ₁ The positions of both ends in the width direction of (2) are the same.

At each end in the width direction of the optical laminate 70a, the adhesive layer 30a and the 2 nd retardation layer 22a ₁ The position of each end part is up to the position of the end part of the optical film adhesive layer 62aThe distance in the width direction of (b) 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, and more preferably 10cm or less. The distances may be the same or different at both ends of the optical layered body 70a in the width direction.

In the optical laminate 70a, as shown in fig. 1, the positions of both ends in the width direction of the optical film adhesive layer 62a may be set to be the 1 st retardation layer 12a ₁ The positions of both ends in the width direction of (2) are the same.

In the optical laminate 70a, as shown in fig. 1, the positions of both ends in the width direction of the optical film adhesive layer 62a may be set to be further inward in the width direction than the positions of both ends in the width direction of the optical film 60a.

The distance in the width direction from the position of the end of the optical film adhesive layer 62a to the position of the end of the optical film 60a at each end of the optical laminate 70a in the width direction 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, and more preferably 10cm or less. The distances may be the same or different at both ends of the optical layered body 70a in the width direction.

In the optical laminate 70a, both ends of the adhesive layer 30a in the width direction are positioned with respect to the 1 st retardation layer 12a ₁ Is positioned on the inner side in the width direction, and the positions of both ends in the width direction of the adhesive layer 62a for an optical film are positioned with respect to the adhesive layer 30a and the 2 nd retardation layer 22a ₁ The positions of both ends in the width direction are located on the outer sides in the width direction. Therefore, as shown in fig. 1, the optical film adhesive layer 62a and the 1 st retardation layer 12a can be provided at the end of the optical laminate 70a ₁ And (6) attaching. In the optical laminate 70a shown in fig. 1, both ends in the width direction of the 1 st retardation layer 12a and both ends in the width direction of the optical film adhesive layer 62a are separated, but since each layer forming the optical laminate 70a is very thin, it is opposed to the adhesive layer 30a and the 2 nd retardation layer 22a ₁ Light beams having respective widthwise both ends positioned outside the widthwise directionAdhesive layer 62a for an optical film, and

phase difference layer

1, 12a ₁ The both ends in the width direction of (2) are in a state of being easily bonded.

In the optical laminate 70a shown in fig. 1, the optical film 60a and the 1 st retardation layer 12a may be sandwiched by the optical film adhesive layer 62a ₁ And (5) laminating. Thus, in the optical laminate 71a with a base material layer (fig. 2 and 4 b) obtained in the production of the optical laminate 70a described later, the length of the region existing outside the widthwise ends of the optical film adhesive layer 62a in the widthwise direction can be made relatively shorter in the widthwise direction than the length of the corresponding region in the optical laminate 71p with a base material layer shown in fig. 6 b. This can suppress deformation such as bending or warping in the region of the optical laminate 71a with a base layer that is present outside the widthwise ends of the adhesive layer 62a for an optical film in the widthwise direction, and suppress appearance defects of the optical laminate 70a.

In the optical laminate 70a shown in fig. 1, the positions of both ends in the width direction of the optical film adhesive layer 62a are located further inward in the width direction than the positions of both ends in the width direction of the optical film 60a, and are further inward in the width direction than the 1 st retardation layer 12a ₁ The positions of both ends in the width direction of (2) are the same. Therefore, when the optical laminate 70a is transported, the optical film adhesive layer 62a can be prevented from protruding outward in the width direction, and thus, the transport path can be prevented from being contaminated by adhesion of a part of the optical film adhesive layer 62a to the transport path.

The optical laminate of the present embodiment may be modified as follows. The above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 1)

In the optical laminate of the present embodiment, the 1 st retardation layer may further include a1 st base material layer on the side opposite to the adhesive layer. Hereinafter, the optical laminate including the 1 st base material layer may be specifically referred to as "base material layer-attached optical laminate".

FIG. 2 shows an example of an optical laminate 71a (optical laminate) having a base material layerA schematic cross-sectional view. Hereinafter, the same members as those shown in fig. 1 are denoted by the same reference numerals, and description thereof will be omitted. The substrate-layer-attached optical laminate 71a includes a1 st substrate layer 11a, a1 st retardation layer 12a, an adhesive layer 30a (1 st adhesive layer), and a 2 nd retardation layer 22a in this order ₁ An optical film adhesive layer 62a (2 nd adhesive layer), and an optical film 60a (resin film).

In the optical laminate 71a with a base material layer, as shown in fig. 2, the positions of both ends in the width direction of the adhesive layer 30a are located inward in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12 a. At each end in the width direction of the optical laminate 71a with a base layer, the distance in the width direction from the position of the end of the adhesive layer 30a to the position of the end of the 1 st retardation layer 12a is usually 0.5cm or more, may be 0.7cm or more, may be 1.0cm or more, and is usually 20cm or less, preferably 15cm or less, and more preferably 10cm or less. The distances may be the same or different at both ends of the 1 st retardation layer 12a in the width direction.

As shown in fig. 2, the optical laminate 71a with a base material layer is preferably such that the positions of both ends in the width direction of the optical film adhesive layer 62a are the same as the positions of both ends in the width direction of the 1 st retardation layer 12a, or are located inward in the width direction with respect to these positions. When the positions of both ends in the width direction of the optical film adhesive layer 62a are located outside the positions of both ends in the width direction of the 1 st retardation layer 12a, the optical film adhesive layer 62a is bonded to the 1 st base material layer 11a, and the 1 st base material layer 11a is difficult to be peeled in a method for producing an optical laminate to be described later.

As shown in fig. 2, the optical laminate 71a with a base material layer is preferably such that the positions of both ends in the width direction of the 1 st base material layer 11a are located further outward in the width direction than the positions of both ends in the width direction of the 1 st retardation layer 12 a. At each end in the width direction of the optical laminate 71a with a base material layer, the distance in the width direction from the position of the end of the 1 st retardation layer 12a to the position of the end of the 1 st 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, and more preferably 10cm or less. The distances may be the same or different at both ends in the width direction of the optical laminate 71a with a base layer.

In the optical laminate 71a with a base material layer shown in fig. 2, the positions of both ends in the width direction of the adhesive layer 30a are located inward in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12a, and the positions of both ends in the width direction of the adhesive layer 62a for an optical film are located with respect to the adhesive layer 30a and the 2 nd retardation layer 22a ₁ The positions of both ends in the width direction of each are located on the outer sides in the width direction. Therefore, as shown in fig. 2, the 1 st end portion of the optical laminate 71a with a base material layer can be bonded to the 1 st retardation layer 12a via the adhesive layer 62a for an optical film. In the optical laminate 71a with a base layer shown in fig. 2, the optical film 60a and the 1 st retardation layer 12a may be bonded to each other with the optical film adhesive layer 62a interposed therebetween. Thus, in the optical laminate 71a with a base material layer, the length of the region present outside the two ends in the width direction of the optical film adhesive layer 62a can be made relatively shorter in the width direction than the length of the corresponding region in the optical laminate 71p with a base material layer shown in fig. 6 (b). This can suppress deformation such as bending or warping in the region of the optical laminate 71a with a base layer that is present outside the width direction of the optical film adhesive layer 62a at both ends in the width direction.

In the optical laminate 71a with a base material layer shown in fig. 2, the positions of both ends in the width direction of the optical film adhesive layer 62a are located further inward in the width direction than the positions of both ends in the width direction of the optical film 60a, and are the same as the positions of both ends in the width direction of the 1 st retardation layer 12a, or are located further inward in the width direction than the positions. Therefore, when the optical laminate 71a with the base material layer is conveyed, the optical film adhesive layer 62a can be prevented from protruding outward in the width direction, and thus, the conveyance path can be prevented from being contaminated by adhesion of a part of the optical film adhesive layer 62a to the conveyance path.

(modification 2 of embodiment 1)

In the optical laminate of the present embodiment, at one end in the width direction of the optical laminate 70a, the position of the end of the 1 st adhesive layer may be located on the inner side in the width direction with respect to the position of the end of the 1 st liquid crystal layer, and the position of the end of the 2 nd adhesive layer may be located on the outer side in the width direction with respect to the position of the end of the 1 st adhesive layer and the position of the end of the 2 nd liquid crystal layer. In this case, at the one end portion, deformation such as bending and warping of the optical laminate with the base material layer for obtaining the optical laminate can be suppressed, and appearance defects of the optical laminate can be suppressed.

(modification 3 of embodiment 1)

In the optical laminate of the present embodiment, the positions of both ends in the width direction of the adhesive layer for an optical film may be the same as the positions of both ends in the width direction of the optical film 60a. Thus, when the optical laminate 70a is conveyed, the optical film adhesive layer 62a can be prevented from protruding outward in the width direction, and thus the conveyance path can be prevented from being contaminated by adhesion of a part of the optical film adhesive layer 62a to the conveyance path.

(modification 4 of embodiment 1)

The optical laminate of the present embodiment may include, instead of the adhesive layer for an optical film and the optical film, an adhesive layer for an optical film and a release film (resin film) for protecting the adhesive layer, and an adhesive layer for an optical laminate and a release film (resin film) for protecting the adhesive layer, which will be described later. The release film may be one having an optical film adhesive layer or an optical laminate adhesive layer on the release treated surface thereof, and may be released after transferring the optical film adhesive layer or the optical laminate adhesive layer to the 2 nd retardation layer. An optical film may be laminated on the optical film adhesive layer exposed by peeling the release film. The adhesive layer for an optical layered body exposed by peeling off the release film can be used when being bonded to a display panel such as an organic EL display device or a liquid crystal display device.

(modification 5 of embodiment 1)

In the optical layered body 70a described above, the 1 st retardation layer 12a may be provided ₁ The side opposite to the adhesive layer 30a is provided with an adhesive layer for optical layered body. The adhesive layer for optical layered body can be bonded to an organic EL displayDisplay panels for display devices, liquid crystal display devices, and the like. In the 2 nd retardation layer 22a ₁ When an adhesive layer for an optical layered body is provided thereon, the 1 st retardation layer 12a may be used ₁ The optical film is provided on the side opposite to the adhesive layer 30a with the adhesive layer for optical film interposed therebetween.

Embodiment 2 (method for producing optical laminate)

Fig. 3 (a) to (d) are schematic cross-sectional views schematically showing a part of an example of the process for producing the optical laminate according to the present embodiment. Fig. 4 (a) to (c) are schematic diagrams schematically showing the subsequent steps of the production process of the optical layered body shown in fig. 3. In the drawing, W represents a width direction.

The method for manufacturing the optical laminate 70a includes:

a substrate layer 11a 1 st, a retardation layer 12a (a 1 st' liquid crystal layer), an adhesive layer 30a (a 1 st adhesive layer), and a retardation layer 22a 2 nd are prepared in this order ₁ A step of forming a retardation film 50a (liquid crystal film) (a 2 nd liquid crystal layer) (fig. 4 a);

a step of preparing an optical film 60a (resin film) (fig. 4 a); and

in the 2 nd retardation layer 22a of the retardation film 50a ₁ And a step of bonding the optical film 60a to the side of the optical laminate with the optical film adhesive layer 62a (2 nd adhesive layer) interposed therebetween to obtain an optical laminate 71a with a base material layer (fig. 4 (b)).

Here, as shown in FIG. 4 (a), at both ends in the width direction of the retardation film 50a,

the adhesive layer 30a has both ends in the width direction positioned inward in the width direction from both ends in the width direction of the 1 st retardation layer 12a, and is positioned to be adjacent to the 2 nd retardation layer 22a ₁ The positions of both ends in the width direction of (a) are the same,

as shown in fig. 4 (b), the positions of both ends in the width direction of the adhesive layer 62a for optical film of the optical laminate 71a with a base material layer are opposite to the positions of both ends in the width direction of the adhesive layer 30a and the 2 nd retardation layer 22a ₁ Are located on the outer side in the width direction.

The step of preparing the retardation film 50a in the method of manufacturing the optical laminate 70a includes:

a step of preparing a1 st stacked part 10a and a 2 nd stacked part 20a (fig. 3 (a) and (b));

a step of obtaining a retardation layer laminate 40a (liquid crystal layer laminate) by laminating the 1 st retardation layer 12a of the 1 st laminated part 10a and the 2 nd retardation layer 22a of the 2 nd laminated part 20a with the adhesive layer 30a interposed therebetween (fig. 3 (c)); and

a step of obtaining a retardation film 50a by peeling the 1 st peeling layer including the 2 nd base material layer 21a from the retardation layer laminate 40a (FIG. 3 (d)),

the 2 nd phase difference layer 22a ₁ Is a layer formed of the 2 nd retardation layer 22a,

in the retardation layer laminate 40a, as shown in fig. 3 (c), the positions of both ends in the width direction of the adhesive layer 30a may be located inward in the width direction with respect to both ends in the width direction of the 1 st retardation layer 12a and inward in the width direction with respect to both ends in the width direction of the 2 nd retardation layer 22 a.

In the optical laminate 71a with a base layer, the positions of both ends in the width direction of the optical film adhesive layer 62a may be located inward in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12a, or may be located inward in the width direction with respect to the positions of both ends in the width direction of the optical film 60a. In the optical laminate 71a with a base layer, both ends in the width direction of the 1 st retardation layer 12a and both ends in the width direction of the optical film 60a may be bonded to each other with the adhesive layer 62a for an optical film interposed therebetween.

The method for producing the optical laminate 70a may include a step of peeling the 2 nd peeling layer including the 1 st base material layer 11a from the optical laminate 71a with the base material layer (fig. 4 (c)). The optical laminate 71a with a base layer is peeled from the 2 nd peeling layer to obtain the 1 st retardation layer 12a ₁ The 1 st retardation layer 12a ₁ And an optical laminate 70a having the same position at both ends in the width direction as that of the optical film adhesive layer 62 a.

The method for producing the optical laminate 70a may further include the step of providing the 1 st retardation layer 12a in the optical laminate 70a ₁ And forming an adhesive layer for an optical layered body.

The following description is specifically made based on the drawings. The optical laminate 71a shown in fig. 4 (b) is the same as the optical laminate 71a with a base material layer shown in fig. 2, and the optical laminate 70a shown in fig. 4 (c) is the same as the optical laminate 70a shown in fig. 1. Therefore, the same reference numerals are used below for the same members as those of the optical laminate shown in fig. 1 and 2 and the members forming them, and the description thereof will be omitted.

In the method for producing the optical laminate 71a, first, a1 st laminated part 10a including a1 st base material layer 11a and a1 st retardation layer 12a as shown in fig. 3 (a) and a 2 nd laminated part 20a including a 2 nd base material layer 21a and a 2 nd retardation layer 22a as shown in fig. 3 (b) are prepared. The 1 st laminated portion 10a and the 2 nd laminated portion 20a are long film-like materials, and the steps described later are performed while the 1 st laminated portion 10a and the 2 nd laminated portion 20a are continuously conveyed. The width direction W is a direction orthogonal to the longitudinal direction of the film.

Next, the 1 st retardation layer 12a of the 1 st stacked part 10a and the 2 nd retardation layer 22a of the 2 nd stacked part 20a are stacked with the adhesive layer 30a interposed therebetween, to obtain a retardation layer stacked body 40a shown in fig. 3 (c). Thereafter, the 2 nd base material layer 21a (1 st release layer) is peeled from the retardation layer laminate 40a, whereby a retardation film 50a shown in fig. 3 (d) is obtained.

The 1 st laminated part 10a shows a case where the positions of both ends in the width direction of the 1 st base material layer 11a are located outside the positions of both ends in the width direction of the 1 st retardation layer 12a, but may be the same as the positions of both ends in the width direction of the 1 st retardation layer 12 a. As shown in fig. 3 (b), the 2 nd laminated part 20a shows a case where the positions of both ends in the width direction of the 2 nd base material layer 21a are located outside the positions of both ends in the width direction of the 2 nd retardation layer 22a, but may be the same as the positions of both ends in the width direction of the 2 nd retardation layer 22 a.

In the retardation layer laminate 40a, as shown in fig. 3 (c), the positions of both ends in the width direction of the adhesive layer 30a are located inward in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12a, and are located inward in the width direction with respect to the positions of both ends in the width direction of the 2 nd retardation layer 22 a. The positions of both ends of the adhesive layer 30a in the width direction are not particularly limited. For example, a region of 0.2cm or more, a region of 0.5cm or more, a region of 1.0cm or more, or a region of 20cm or less in general, and a region of 15cm or less in preferred may be provided inside in the width direction with respect to the position of the end in the width direction of the 1 st retardation layer 12a or the 2 nd retardation layer 22 a.

The retardation film 50a can be obtained by peeling the 2 nd base material layer 21a (1 st peeling layer) from the retardation layer laminate 40a. The retardation film 50a has a1 st base material layer 11a, a1 st retardation layer 12a, an adhesive layer 30a, and a 2 nd retardation layer 22a in a cross section in the width direction thereof ₁ . In the retardation film 50a, in the cross section in the width direction thereof, the adhesive layer 30a and the 2 nd retardation layer 22a are bonded at the positions of both ends in the width direction ₁ The positions of both ends in the width direction of (2) are the same.

When the 2 nd base material layer 21a is peeled from the phase difference layer laminate 40a shown in fig. 3 (c), a part of the 2 nd phase difference layer 22a is easily transferred to the 2 nd base material layer 21a as shown in fig. 3 (d). This is because, in the retardation layer laminate 40a shown in fig. 3 (c), the positions of both ends in the width direction of the 2 nd retardation layer 22a are located outside the positions of both ends in the width direction of the adhesive layer 30a, and the 2 nd retardation layer 22a has unfixed regions (portions indicated by the lower left and higher right oblique lines in fig. 3 (c)) which are not fixed to the adhesive layer 30 a. Therefore, when the 2 nd base material layer 21a is peeled from the retardation layer laminate 40a, the 2 nd retardation layer 22a shown in fig. 3 (c) is separated into a region fixed to the adhesive layer 30a (the 2 nd retardation layer 22a shown in fig. 3 (d)) ₁ ) And unfixed regions (portions indicated by the diagonal lines in fig. 3 (c) and (d)) transferred to the 2 nd base material layer 21a, the 2 nd retardation layer 22a can be obtained as shown in fig. 3 (d) ₁ And a retardation film 50a having the same position at both ends in the width direction as that of the adhesive layer 30 a.

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

By applying light as shown in FIG. 4 (b)The film 60a is laminated on the 2 nd retardation layer 22a of the retardation film 50a via an adhesive layer 62a for optical film ₁ The optical laminate 71a with a base layer (optical laminate) described in the previous embodiment can be obtained. In this case, the optical film 60a may be provided with the optical film adhesive layer 62a, and the optical film adhesive layer 62a and the 2 nd retardation layer 22a of the retardation film 50a may be further provided ₁ The retardation film may be bonded to the 2 nd retardation layer 22a of the retardation film 50a ₁ An optical film adhesive layer 62a is provided thereon, and the optical film adhesive layer 62a is bonded to the optical film 60a.

As shown in fig. 4 (b), in the optical laminate 71a with a base layer, the positions of both ends in the width direction of the adhesive layer 62a for an optical film are located outside the positions of both ends in the width direction of the adhesive layer 30a and outside the positions of both ends in the width direction of the 2 nd retardation layer 22a ₁ Is located on the outer side in the width direction, and is located on the inner side in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12 a.

Therefore, the optical laminate 71a with a base layer may be laminated with the 1 st retardation layer 12a via the adhesive layer 62a for an optical film or laminated with the 1 st retardation layer 12a via the adhesive layer 62a for an optical film at both ends in the width direction. Thus, in the method for manufacturing the optical laminate 70a, deformation such as bending and warping in the region where both ends in the width direction of the base layer-attached optical laminate 71a with respect to the optical film adhesive layer 62a are present outside in the width direction can be suppressed. As a result, the appearance failure of the optical laminate 70a obtained by the method for producing the optical laminate 70a can also be suppressed.

The optical laminate 70a can be obtained by peeling the 1 st base material layer 11a (the 2 nd peeling layer) from the optical laminate 71a with base material layers (fig. 4 (c)). In the optical laminate 71a with a base material layer, as shown in fig. 4 (b), the positions of both ends in the width direction of the optical film adhesive layer 62a are located inward in the width direction with respect to the positions of both ends in the width direction of the 1 st retardation layer 12 a. Therefore, since the optical film adhesive layer 62a is not bonded to the 1 st base material layer 11a, the 1 st base material layer 11a can be easily peeled. Thus, it is obtainedThe optical laminate 70a thus obtained has the 1 st retardation layer 12a laminated in this order as shown in fig. 4 (c) ₁ Adhesive layer 30a, no. 2 retardation layer 22a ₁ An optical film adhesive layer 62a, and an optical film 60a.

When the 1 st base material layer 11a is peeled from the optical laminate 71a with base material layers shown in fig. 4 (b), a part of the 1 st retardation layer 12a is easily transferred to the peeled 1 st base material layer 11a as shown in fig. 4 (c). This is because, in the optical laminate 71a with a base layer shown in fig. 4 (b), in the cross section in the width direction thereof, the positions of both ends in the width direction of the 1 st retardation layer 12a are located outside the positions of both ends in the width direction of the adhesive layer 62a for an optical film, and the 1 st retardation layer 12a has unfixed areas (portions indicated by high diagonal lines in the lower left and the higher right in fig. 4 (b)) which are not fixed to the adhesive layer 62a for an optical film. In the optical laminate 71a with a base material layer shown in fig. 4 (b), both ends in the width direction of the 1 st retardation layer 12a and both ends in the width direction of the optical film adhesive layer 62a are separated, but since each layer forming the optical laminate 71a with a base material layer is very thin, both ends in the width direction of the 1 st retardation layer 12a and both ends in the width direction of the optical film adhesive layer 62a are actually bonded.

Therefore, when the 1 st base material layer 11a is peeled from the optical laminate 71a with a base material layer, the 1 st retardation layer 12a shown in fig. 4 (b) is separated into a region fixed to the optical film adhesive layer 62a (the 1 st retardation layer 12a shown in fig. 4 (c)) ₁ ) And a non-fixed region (a portion indicated by a diagonal line in fig. 4 (b) and (c)) transferred to the 1 st base material layer 11a, the 1 st retardation layer 12a can be obtained in a cross section in the width direction as shown in fig. 4 (c) ₁ And an optical laminate 70a having the same position at both ends in the width direction as that of the optical film adhesive layer 62 a.

The optical laminate 70a may be produced by a method including peeling the 1 st base material layer 11a to expose the 1 st retardation layer 12a ₁ And forming an adhesive layer for an optical layered body, not shown. The adhesive layer for an optical layered body can be used when bonded to a display panel of an organic EL display device, a liquid crystal display device, or the like。

The method for manufacturing the optical laminate of the present embodiment may be modified to the modification examples described below.

The above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 2)

In the method for producing the optical laminate 70a of the present embodiment, for example, as in the retardation film 50a shown in fig. 4 (a), the positions of both ends in the width direction of the adhesive layer 30a in the cross section in the width direction of the retardation film 50a may be prepared so as to be located inside in the width direction with respect to the 1 st retardation layer 12a and so as to be located inside in the width direction with respect to the 2 nd retardation layer 22a ₁ And the optical laminate is produced by using the retardation film having the same position at both ends in the width direction.

(modification 2 of embodiment 2)

In the method for producing the optical laminate 70a according to the present embodiment, the positional relationship of the respective layers may be set to the above-described relationship at one end portion on the same side in the width direction of each of the retardation layer laminate 40a, the retardation film 50a, the optical laminate 71a with a base material layer, and the optical laminate 70a. Thus, at the one end portion, deformation such as bending and warping of the optical laminate with the substrate layer for obtaining the optical laminate can be suppressed, and appearance defects of the optical laminate can be suppressed, and instability in transportation of the optical laminate with the substrate layer can be suppressed.

(modification 3 of embodiment 2)

In the method of manufacturing the optical laminate 70a of the present embodiment, the positions of both ends in the width direction of the optical film adhesive layer 62a may be the same as the positions of both ends in the width direction of the optical film 60a. Thus, when the optical laminate 70a is conveyed, the optical film adhesive layer 62a can be prevented from protruding outward in the width direction, and therefore, the conveyance path can be prevented from being contaminated by adhesion of a part of the optical film adhesive layer 62a to the conveyance path.

(modification 4 of embodiment 2)

In the method of manufacturing the optical laminate 70a according to the present embodiment, instead of the optical film adhesive layer 62a and the optical film 60a, the optical film adhesive layer 62a and a release film (resin film) for protecting the same, or the optical laminate adhesive layer and a release film (resin film) for protecting the same may be used.

In the case of using a release film for protecting the optical film adhesive layer 62a, the method for producing an optical laminate further includes:

a step of providing an optical film adhesive layer 62a on the release-treated surface of the release film;

the side of the adhesive layer 62a for optical film and the 2 nd retardation layer 22a are arranged ₁ A step of laminating a release film provided with the optical film adhesive layer 62a on the retardation film 50a in a facing manner;

peeling off the release film, and transferring the adhesive layer 62a for optical film to the 2 nd retardation layer 22a of the retardation film 50a ₁ The above step; and

a 2 nd retardation layer 22a on the optical film adhesive layer 62a ₁ And a step of laminating the optical film 60a on the opposite side, whereby an optical laminate with a base material layer can be obtained.

In the case of using a release film for protecting an adhesive layer for an optical laminate, the method for producing an optical laminate may comprise: a step of providing an adhesive layer for an optical layered body on a release-treated surface of a release film; and a 2 nd retardation layer 22a provided on the side of the adhesive layer for optical laminate ₁ And a step of laminating a release film provided with an adhesive layer for an optical layered body on the retardation film 50a so as to face each other. In this case, the retardation film can be formed on the 1 st retardation layer 12a exposed by peeling the 1 st base material layer 11a ₁ The optical film is provided on the substrate with the adhesive layer for optical film interposed therebetween.

While the embodiments and the modifications of the present invention have been described above, the present invention is not limited to these embodiments and modifications, and for example, the configurations and steps of the embodiments and the modifications may be combined and implemented. Hereinafter, the respective matters common to all the embodiments and the modifications thereof will be described in detail.

(No. 1 substrate layer and No. 2 substrate layer)

The 1 st base material layer and the 2 nd base material layer function as support layers for supporting a1 st alignment layer and a 2 nd alignment layer, which will be described later, and a1 st liquid crystal layer and a 2 nd liquid crystal layer, which are formed on these base material layers.

The 1 st base material layer and the 2 nd base material layer are preferably films formed of a resin material.

As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like is used. Specific examples thereof include polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; polystyrene resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide resin; a polyether ketone resin; polyphenylene sulfide-based resin; polyphenylene ether resins, and mixtures and copolymers thereof. Among these resins, any of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth) acrylic resins, or mixtures thereof are preferably used. The "(meth) acrylic acid" means "at least 1 kind of acrylic acid and methacrylic acid".

The 1 st base material layer and the 2 nd base material layer may be single layers of 1 kind of resin or a mixture of 2 or more kinds of resins, or may have a multilayer structure of 2 or more layers. In the case of having a multilayer structure, the resins forming the respective layers may be the same as or different from each other.

An arbitrary additive may be added to the resin material forming the film formed of the resin material. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.

The thickness of the 1 st base material layer and the 2 nd base material layer is not particularly limited, but is preferably 1 to 500 μm, more preferably 1 to 300 μm, and further preferably 5 to 200 μm in view of strength, handling properties, and the like.

In the case where the 1 st stacked layer has a1 st alignment layer described later, or the 2 nd stacked layer has a 2 nd alignment layer described later, in order to improve the adhesion between the 1 st base material layer and the 1 st alignment layer and the adhesion between the 2 nd base material layer and the 2 nd alignment layer, corona treatment, plasma treatment, flame treatment, or the like may be performed on at least the surface of the 1 st base material layer on which the 1 st alignment layer is formed and at least the surface of the 2 nd base material layer on which the 2 nd alignment layer is formed, and a primer layer or the like may be formed. The adhesion can be adjusted by adjusting the components of the composition for forming the alignment layers used for forming the 1 st alignment layer and the 2 nd alignment layer and the components of the composition for forming the liquid crystal layers used for forming the 1 st liquid crystal layer and the 2 nd liquid crystal layer.

(1 st alignment layer and 2 nd alignment layer)

The 1 st stacked part may include a1 st alignment layer between the 1 st base material layer and the 1 st liquid crystal layer. In addition, the 2 nd laminate section may include a 2 nd alignment layer between the 2 nd substrate layer and the 2 nd liquid crystal layer.

The 1 st alignment layer and the 2 nd alignment layer have alignment regulating forces for aligning liquid crystal compounds contained in the 1 st liquid crystal layer and the 2 nd liquid crystal layer formed on the alignment layers in a desired direction. Examples of the 1 st alignment layer and the 2 nd alignment layer include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove alignment layer having a concave-convex pattern or a plurality of grooves (grooves) on a surface of a layer, and the 1 st alignment layer and the 2 nd alignment layer may be the same kind of layer or different kinds of layers. The thickness of the 1 st alignment layer and the 2 nd alignment layer is usually 10 to 500nm, preferably 10 to 200nm.

The alignment polymer layer can be formed by applying a composition in which an alignment polymer is dissolved in a solvent to a base material layer (1 st base material layer or 2 nd base material layer), removing the solvent, and performing a rubbing treatment as necessary. In this case, the orientation regulating force of the oriented polymer layer formed of the oriented polymer can be arbitrarily adjusted by utilizing the surface state and the friction condition of the oriented polymer.

The photo-alignment polymer layer can be formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent to a substrate layer (1 st substrate layer or 2 nd substrate layer) and irradiating the composition with polarized light. In this case, the photo-alignment polymer layer can be arbitrarily adjusted in alignment regulating force by using the polarized light irradiation condition of the photo-alignment polymer.

The groove alignment layer can be formed, for example, by a method of forming a concave-convex pattern by exposing and developing the surface of a photosensitive polyimide film through an exposure mask having a slit with a pattern shape; a method of forming an uncured layer of an active energy ray-curable resin on a plate-like master having grooves on the surface thereof, transferring the layer to a base material layer (1 st base material layer or 2 nd base material layer), and curing the layer; a method of forming an uncured layer of an active energy ray-curable resin on a base material layer (1 st base material layer or 2 nd base material layer), and curing the uncured layer by pressing a roll-shaped master having irregularities against the uncured layer or the like to form irregularities.

The 1 st and 2 nd release layers may include a1 st alignment layer and a 2 nd alignment layer. That is, in the case where the 1 st release layer includes the 2 nd base material layer, the 1 st release layer may include the 2 nd alignment layer. Similarly, when the 2 nd release layer includes the 1 st base material layer, the 2 nd release layer may include the 1 st alignment layer. The same applies to the case where the 1 st release layer includes the 1 st base material layer and the case where the 2 nd release layer includes the 2 nd base material layer. In addition, in the case where the 1 st peeling layer does not include the 1 st alignment layer or the 2 nd alignment layer, the 1 st alignment layer or the 2 nd alignment layer may remain on the 1 st liquid crystal layer or the 2 nd liquid crystal layer, respectively, after peeling the 1 st peeling layer. Similarly, in the case where the 2 nd release layer does not include the 1 st alignment layer or the 2 nd alignment layer, the 1 st alignment layer or the 2 nd alignment layer may remain on the 1 st liquid crystal layer or the 2 nd liquid crystal layer, respectively, after the 2 nd release layer is released. The layers included in the 1 st release layer and the 2 nd release layer can be set by adjusting the relationship between the adhesion forces between the layers, and can be adjusted by, for example, the above-described corona treatment, plasma treatment, flame treatment, primer layer, composition for forming an alignment layer, composition for forming a liquid crystal layer, and the like performed on the 1 st base layer and the 2 nd base layer.

When the 1 st alignment layer remains on the 1 st liquid crystal layer or the 2 nd alignment layer remains on the 2 nd liquid crystal layer, the adhesive layer for an optical laminate may be provided on the 1 st alignment layer or the 2 nd alignment layer. In addition, when the 2 nd alignment layer remains on the 2 nd liquid crystal layer or when the 1 st alignment layer remains on the 1 st liquid crystal layer, the adhesive layer for an optical film may be provided on the 2 nd alignment layer or the 1 st alignment layer.

(No. 1 liquid crystal layer and No. 2 liquid crystal layer)

The 1 st liquid crystal layer and the 2 nd liquid crystal layer may be formed using a known liquid crystal compound. The type of the liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystal compound may be a polymeric liquid crystal compound, a polymerizable liquid crystal compound, or a mixture thereof. For example, when a polymerizable liquid crystal compound is used, the 1 st liquid crystal layer and the 2 nd liquid crystal layer can be formed as liquid crystal cured layers by applying a composition containing a polymerizable liquid crystal compound onto an alignment layer (the 1 st alignment layer or the 2 nd alignment layer) to form a coating film and curing the coating film. Alternatively, a liquid crystal layer (1 st liquid crystal layer or 2 nd liquid crystal layer) may be formed by applying a liquid crystal compound on a base material layer (1 st base material layer or 2 nd base material layer) to form a coating film and stretching the coating film together with the base material layer.

The 1 st liquid crystal layer and the 2 nd liquid crystal layer may be, for example, a1 st retardation layer and a 2 nd retardation layer, respectively. The 1 st retardation layer and the 2 nd retardation layer are not particularly limited as long as they are layers that impart a predetermined retardation to light, and examples thereof include layers that function as a 1/2 wavelength plate, a 1/4 wavelength plate, a positive C plate, a 1/4 wavelength plate with reverse wavelength dispersion, and the like.

When the optical film in the optical laminate of the present embodiment is a polarizing film, the optical laminate of the present embodiment can be used as a composite polarizing plate. When the composite polarizing plate constitutes a circular polarizing plate, the types of liquid crystal layers forming the 1 st liquid crystal layer and the 2 nd liquid crystal layer (the 1 st retardation layer and the 2 nd retardation layer) are preferably selected so 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 sequentially stacked, or a structure in which a polarizing layer (linear polarizing layer), a 1/4 wavelength plate having reverse wavelength dispersibility, and a positive C plate are sequentially stacked.

(liquid Crystal film)

The liquid crystal film includes a1 st liquid crystal layer and a 2 nd liquid crystal layer, and may be a retardation film, for example, when the 1 st liquid crystal layer and the 2 nd liquid crystal layer are a1 st retardation layer and a 2 nd retardation layer, respectively.

(resin film)

Examples of the resin film include an optical film and a release film (spacer) for protecting the adhesive layer. Examples of the optical film include a polarizing film, a reflective film, a semi-transmissive reflective film, a brightness enhancement film, an optical compensation film, and a film with an antiglare function. Further, a film having the same structure as the retardation film (liquid crystal film) described above may be used. Examples of the release film include a film obtained by subjecting the surface of a base film to a mold release treatment such as silicone treatment. Examples of the resin material for forming the base film include the same resin materials as those for forming the 1 st base layer and the 2 nd base layer. The resin film may have a 1-layer structure or a multilayer structure having 2 or more layers.

(adhesive layer)

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

The adhesive may be a combination of 1 or 2 or more of an aqueous adhesive, an active energy ray-curable adhesive, a pressure-sensitive adhesive, and the like. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution, and an aqueous two-part (two-part) urethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, and examples thereof include an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include photopolymerization initiators containing a substance that generates an active species such as a neutral radical, an anionic radical, and a cationic radical by irradiation with an active energy ray such as ultraviolet ray.

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

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

(adhesive layer for optical film)

The adhesive layer for an optical film can be formed using an adhesive, a pressure-sensitive adhesive, or a combination thereof. The optical film adhesive layer is usually 1 layer, but may be formed of 2 or more layers. When the adhesive layer for an optical film includes 2 or more layers, each layer may be formed of the same material or different materials.

The adhesive and the pressure-sensitive adhesive used for forming the adhesive layer for an optical film may be the same as those used for the adhesive layer. As the adhesive layer for an optical film, an adhesive is preferably used.

(adhesive layer for optical layered body)

The adhesive layer for an optical layered body can be formed using an adhesive, a pressure-sensitive adhesive, or a combination thereof. The optical laminate adhesive layer is usually 1 layer, but may be formed of 2 or more layers. When the adhesive layer for an optical layered body includes 2 or more layers, the layers may be formed of the same material or different materials.

Examples of the adhesive and the pressure-sensitive adhesive for forming the adhesive layer for an optical layered body include the same adhesives and pressure-sensitive adhesives used for the adhesive layer. As the adhesive layer for an optical film, an adhesive is preferably used.

Claims

1. An optical laminate comprising a plurality of optical layers,

an optical laminate comprising a1 st liquid crystal layer, a1 st adhesive layer, a 2 nd liquid crystal layer, a 2 nd adhesive layer and a resin film in this order,

at least one end portion in the width direction of the optical layered body,

the 1 st liquid crystal layer is attached to the 2 nd adhesive layer,

the position of the end of the 1 st adhesive layer is located inward in the width direction with respect to the position of the end of the 1 st liquid crystal layer,

the position of the end of the 2 nd adhesive layer is positioned at the outer side in the width direction relative to the position of the end of the 1 st adhesive layer and the position of the end of the 2 nd liquid crystal layer,

the position of the end of the 2 nd adhesive layer is the same as the position of the end of the 1 st liquid crystal layer, or is located inward in the width direction with respect to the position.

2. The optical stack of claim 1,

at least one end portion in the width direction of the optical layered body, a position of an end portion of the 2 nd adhesive layer is the same as or located inward in the width direction with respect to a position of an end portion of the resin film.

3. The optical stack of claim 1 or 2,

at least one end portion in the width direction of the optical layered body, an end portion of the 1 st liquid crystal layer and an end portion of the resin film are bonded to each other with the 2 nd adhesive layer interposed therebetween.

4. The optical stack of claim 1 or 2,

at both ends in the width direction of the optical layered body,

5. The optical stack according to claim 1 or 2,

the resin film is an optical film.

6. The optical stack of claim 1 or 2,

the 1 st liquid crystal layer includes a1 st alignment layer on a side opposite to the 1 st adhesive layer.

7. The optical stack of claim 1 or 2,

the 1 st liquid crystal layer includes an adhesive layer for an optical layered body on a side opposite to the 1 st adhesive layer.

8. The optical stack of claim 7,

the 1 st alignment layer is included between the 1 st liquid crystal layer and the adhesive layer for an optical layered body.

9. The optical stack according to claim 1 or 2,

the 1 st liquid crystal layer includes a1 st base material layer on a side opposite to the 1 st adhesive layer.

10. The optical stack of claim 9,

at least one end portion in the width direction of the optical layered body, a position of an end portion of the 2 nd adhesive layer is located on an inner side in the width direction with respect to a position of an end portion of the 1 st liquid crystal layer.

11. The optical stack of claim 9,

the 1 st liquid crystal layer and the 1 st substrate layer include a1 st alignment layer therebetween.

12. The optical stack of claim 1 or 2,

a 2 nd alignment layer is included between the 2 nd liquid crystal layer and the 2 nd adhesive layer.

13. The optical stack of claim 1 or 2,

the 1 st liquid crystal layer is a phase difference layer.

14. The optical stack of claim 1 or 2,

the 2 nd liquid crystal layer is a phase difference layer.

15. A method for manufacturing an optical laminate, comprising:

preparing a resin film; and

a step of laminating the resin film on the 2 nd liquid crystal layer side of the liquid crystal film with a 2 nd adhesive layer interposed therebetween to obtain an optical laminate,

at least one end portion in the width direction of the liquid crystal film,

the position of the end of the 1 st adhesive layer is located inward in the width direction with respect to the position of the end of the 1 st' liquid crystal layer and is the same as the position of the end of the 2 nd liquid crystal layer,

a position of an end of the 2 nd adhesive layer of the optical laminate is located outside in a width direction with respect to a position of the end of the 1 st adhesive layer and a position of the end of the 2 nd liquid crystal layer,

in the optical layered body, at least one end portion in the width direction thereof, a position of an end portion of the 2 nd adhesive layer is located on an inner side in the width direction with respect to a position of an end portion of the 1 st 'liquid crystal layer, and the 1 st' liquid crystal layer is bonded to the 2 nd adhesive layer.

16. The method for manufacturing an optical laminate according to claim 15,

the step of preparing a liquid crystal film includes:

at least one end of the liquid crystal layer laminated body in the width direction, the position of the end of the 1 st adhesive layer is located on the inner side of the width direction relative to the end of the 1 st ' liquid crystal layer, and the position of the end of the 2 nd ' liquid crystal layer is located on the inner side of the width direction relative to the end of the 1 st ' liquid crystal layer.

17. The method for manufacturing an optical stack according to claim 15 or 16,

in the optical layered body, at least one end portion in the width direction thereof, a position of an end portion of the 2 nd adhesive layer is the same as or located inward in the width direction with respect to a position of an end portion of the resin film.

18. The method for manufacturing an optical stack according to claim 15 or 16,

at both ends of the liquid crystal film in the width direction,

19. The method for manufacturing an optical laminate according to claim 15 or 16, further comprising a step of peeling a 2 nd peeling layer including the 1 st base material layer from the optical laminate.

20. The method for manufacturing an optical stack according to claim 19,

forming a1 st liquid crystal layer from a1 st' liquid crystal layer by peeling the 2 nd peeling layer,

21. The method for manufacturing an optical laminate according to claim 15 or 16,

the resin film is an optical film.