CN110554451A - Laminate and method for producing same - Google Patents

Abstract

A laminate comprising a1 st base material layer, a1 st functional layer, an adhesive layer, a 2 nd functional layer, and a 2 nd base material layer in this order, wherein the position of the end of the adhesive layer at least one end in the width direction of the laminate satisfies all of the following relationships [ a ] to [ c ]: [a] the position of the end of the 1 st base material layer is the same or more inward in the width direction than the position; [b] a position of an end portion of the 1 st functional layer is located outward in a width direction; [c] the position of the end portion of the 2 nd functional layer is the same as or more inward in the width direction than the position.

Description

Laminated body and its manufacturing method

technical field

This invention relates to a laminated body and its manufacturing method.

Background technique

In display devices such as organic EL display devices and liquid crystal display devices, members including polarizing layers, retardation layers, and the like are used. Patent Documents 1 and 2 describe using a liquid crystal material as a retardation layer of an optical film used in a circularly polarizing plate or the like. In JP2015-21976A1 and JP2015-22248A1, it is described that peeling a support base from a laminate in which a support base material, an orientation layer, a phase difference layer, an adhesive layer, a phase difference layer, an orientation layer, and a support base material are sequentially laminated is described. material.

Contents of the invention

This invention provides the laminated body shown below and its manufacturing method.

[1] A laminate comprising a first base material layer, a first functional layer, an adhesive layer, a second functional layer, and a second base material layer in this order,

At least one end in the width direction of the above-mentioned laminate, the position of the end of the above-mentioned adhesive layer satisfies all of the following relationships [a] to [c]:

[a] the same as the position of the end of the first base material layer or located on the inner side in the width direction than the position;

[b] It is outside in the width direction compared to the position of the end of the first functional layer;

[c] The position is the same as the end portion of the second functional layer or located on the inner side in the width direction than the position. (Hereinafter, this laminated body may be referred to as "laminated body (1)").

[2] The laminate according to [1], wherein the position of the end portion of the adhesive layer satisfies all the relationships of [a] to [c] above at both ends in the width direction of the laminate.

[3] The laminate according to [1] or [2], wherein each of the first functional layer and the second functional layer is a liquid crystal layer.

[4] The laminate according to any one of [1] to [3], wherein at least one of the first functional layer and the second functional layer is a retardation layer.

[5] A laminate comprising a first base material layer, a first functional layer, an adhesive layer, and a 2' functional layer in this order,

The position of the end portion of the above-mentioned adhesive layer at least one end portion in the width direction of the above-mentioned laminate satisfies all of the following relations [a], [b], and [d]:

[a] the same as the position of the end of the first base material layer or located on the inner side in the width direction than the position;

[b] It is outside in the width direction compared to the position of the end of the first functional layer;

[d] The position of the end of the above-mentioned 2' functional layer is the same. (Hereinafter, this laminated body may be referred to as "laminated body (2)").

[6] The laminate according to [5], wherein the positions of the ends of the adhesive layer satisfy all the relationships of [a], [b], and [d] at both ends in the width direction of the laminate. .

[7] The laminate according to [5] or [6], wherein each of the first functional layer and the second' functional layer is a liquid crystal layer.

[8] The laminate according to any one of [5] to [7], wherein at least one of the first functional layer and the second' functional layer is a retardation layer.

[9] The laminate according to any one of [5] to [8], further comprising a resin film,

The above-mentioned resin film is laminated on the side of the above-mentioned 2' functional layer with an adhesive layer interposed therebetween. (Hereinafter, this laminated body may be referred to as "laminated body (3)").

[10] The laminated body according to [9], wherein at least one end portion in the width direction of the laminated body, the position of the end portion of the adhesive layer for the resin film is the same as the position of the end portion of the first functional layer. The positions are the same or located on the inner side in the width direction than this position.

[11] The laminate according to [9] or [10], wherein the resin film is an optical film.

[12] A method for producing a laminate, comprising:

A step of preparing a first lamination part including the first base material layer and the first functional layer;

A step of preparing a second lamination part including the second base material layer and the second functional layer; and

a step of laminating the first lamination part and the second lamination part such that the first functional layer and the second functional layer face each other via the adhesive layer,

At least one end in the width direction of the above-mentioned laminate, the position of the end of the above-mentioned adhesive layer satisfies all of the following relationships [a] to [c]:

[a] the same as the position of the end of the first base material layer or located on the inner side in the width direction than the position;

[b] It is outside in the width direction compared to the position of the end of the first functional layer;

[c] The position is the same as the end portion of the second functional layer or located on the inner side in the width direction than the position.

[13] A method for producing a laminate, which is a method for producing a laminate sequentially comprising a first base material layer, a first functional layer, an adhesive layer, and a 2' functional layer, comprising:

A step of preparing the laminate according to any one of [1] to [4]; and

A step of peeling the second base material layer from the laminate.

[14] A method of manufacturing a laminate comprising:

A step of preparing the laminate according to any one of [5] to [8]; and

A step of laminating the above-mentioned resin film with an adhesive layer via the resin film on the side of the above-mentioned 2' functional layer of the above-mentioned laminate.

[15] A method for manufacturing a laminate, comprising:

A step of preparing the laminate according to any one of [9] to [11]; and

A step of peeling the above-mentioned first base material layer from the above-mentioned laminated body.

The effect of the invention

According to the present invention, a laminate suitable as an optical product material and a method for producing the same can be provided.

Description of drawings

Fig. 1 is a schematic cross-sectional view schematically showing an example of a laminate (1).

(a) and (b) of FIG. 2 are schematic cross-sectional views schematically showing an example of the manufacturing process of the laminated body (1).

Fig. 3 is a schematic cross-sectional view schematically showing an example of a laminate (2).

(a) and (b) of FIG. 4 are schematic cross-sectional views schematically showing an example of the manufacturing process of the laminated body (2).

Fig. 5 is a schematic cross-sectional view schematically showing an example of a laminate (3).

(a) and (b) of FIG. 6 are schematic cross-sectional views schematically showing an example of the manufacturing process of the optical layered body (3).

Fig. 7 is a schematic cross-sectional view schematically showing an example of an optical laminate for comparison with the laminate (1).

Description of symbols

10 1st lamination part, 11 1st substrate layer, 12 1st functional layer (1st liquid crystal layer), 12' 1st' functional layer (1st' liquid crystal layer), 20 2nd lamination part, 21 2nd substrate material layer, 22 second functional layer (second liquid crystal layer), 22x adhesive layer formation area, 22y adhesive layer non-formation area, 22' 2' functional layer (2nd' liquid crystal layer), 22" second" Functional layer (2" liquid crystal layer), 30 Adhesive layer, 30' Adhesive layer, 36 Adhesive layer for optical film, 41 Laminate (1), 42 Laminate (2), 45 Intermediate layer, 51 Laminate (3), 52 Optical laminated body, 60 Optical film (resin film).

Detailed ways

Hereinafter, preferred embodiments of the laminate (1), the laminate (2), and the laminate (3), and methods for producing these laminates (1) to (3) and the optical laminate will be described with reference to the drawings. The respective embodiments described below and their modifications can be combined arbitrarily. In each embodiment and its modifications, the same members as those already described in the preceding embodiments or their modifications are given the same reference numerals, and description thereof will be omitted.

[Embodiment 1 (laminated body (1) and its manufacturing method)]

(laminate (1))

Fig. 1 is a schematic cross-sectional view schematically showing an example of a laminate (1). In the figure, W represents the width direction. As shown in FIG. 1 , the laminate (1) 41 sequentially includes a first base material layer 11, a first functional layer 12, an adhesive layer 30, a second functional layer 22, and a second base material layer 21,

At least one end in the width direction of the laminate (1) 41, the position of the end of the adhesive layer 30 satisfies all of the following relationships [a] to [c]:

[a] same as the position of the end of the first base material layer 11 or on the inner side in the width direction than this position;

[b] It is outside in the width direction compared with the position of the end of the first functional layer 12;

[c] It is the same as the position of the edge part of the 2nd functional layer 22, or it exists in the width direction inside compared with this position.

It should be noted that the position of each end described in the above-mentioned requirements [a] to [c] is the position in the width direction cross-section of the laminated body (1) 41, and when the positional relationship of the ends of each layer is defined below, it is also The position in the cross section of the laminated body (1) 41 in the width direction.

The laminate (1) 41 may be a single film or a long film.

The first base material layer 11 has a function as a supporting layer supporting the first functional layer 12 formed thereon or a protective layer protecting the first functional layer 12 . The first base material layer and the second base material layer may each be a layer in which a plurality of films are laminated. The first base material layer 11 may be a layer having a film exhibiting a polarizing function.

The second base material layer 21 has a function as a supporting layer supporting the second functional layer 22 formed thereon or as a protective layer protecting the first functional layer 12 .

In the present embodiment, the first base material layer 11 may be a film exhibiting releasability, and when exhibiting releasability, it can be peeled off from the first functional layer 12 . The second base material layer 21 may be a film showing releasability, and when it shows releasability, it can be peeled off from the second functional layer 22 .

Examples of the first functional layer 12 include optical films exhibiting optical properties such as polarization properties and optical compensation functions, liquid crystal layers, layers constituting a touch sensor, etc., and may be a resin film or a liquid crystal layer.

The first functional layer 12 is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the first functional layer 12 as a liquid crystal layer may be referred to as a "first liquid crystal layer"). The first liquid crystal layer may be, for example, a cured film formed by polymerizing a polymerizable liquid crystal compound. The first functional layer 12 is preferably a retardation layer, a touch sensor layer, or a polarizing layer, more preferably a retardation layer.

Examples of the second functional layer 22 include thin film layers exhibiting optical properties such as polarization properties and optical compensation functions, and layers constituting a touch sensor, and may be resin films or liquid crystal layers. The second functional layer 22 is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the second functional layer 22 as a liquid crystal layer may be referred to as a "second liquid crystal layer"). Like the first liquid crystal layer, the second liquid crystal layer may be, for example, a cured film formed by polymerizing a polymerizable liquid crystal compound. The second functional layer 22 is preferably a retardation layer, a touch sensor layer, and a polarizing layer, more preferably a retardation layer.

The adhesive layer 30 bonds the second functional layer 22 to the first base material layer 11 and the first functional layer 12 .

At least one end in the width direction of the laminate (1) 41, the position of the end of the adhesive layer 30 satisfies all of the above-mentioned relationships of [a] to [c].

Specifically, in the cross section of the laminate (1) 41 in the width direction, the end of the adhesive layer 30 is the same as the end of the first base material layer 11 or located on the inner side of the width direction than the end, and is connected to the end of the first base material layer 11. The end of the first functional layer 12 is located outside in the width direction, and is the same as the end of the second functional layer 22 or located inside the width direction.

At least one end in the width direction of the laminated body (1) 41 shown in FIG. The position of the end of the second base material layer 21 is outside the position of the end of the second functional layer 22 in the width direction. At least one end in the width direction of the laminate (1) 41, the position of the end of the first base material layer 11 is the same as the position of the end of the second base material layer 21, and the position of the end of the first functional layer 12 is The position is on the inner side in the width direction than the position of the end of the second functional layer 22 . The position of the end of the first base material layer 11 and the position of the end of the second base material layer 21 may be different from each other.

The second base material layer 21 can be peeled from the second functional layer 22, and the laminate (2) 42 can be obtained by peeling the second base material layer 21 from the laminate (1) 41 as described later ( FIG. 3 ).

At least one end in the width direction of the laminated body (1) 41 is formed by making the end of the adhesive layer 30 at the same position as the end of the second functional layer 22 or located on the inner side in the width direction (satisfying the above-mentioned [c]), the state in which the adhesive layer 30 is not adhered to the second base material layer 21 can be made. Therefore, the second base material layer 21 can be peeled from the laminate (1) 41 . Furthermore, at least one end in the width direction of the adhesive layer 30 is made to be the same as the end of the first base material layer 11, or positioned on the inner side in the width direction than the end and connected to the first functional layer 12. The end portion of the second functional layer 22 is located outside in the width direction (satisfying the relationship of [a] and [b] above), so that the region including at least one end portion of the second functional layer 22 can be bonded to the first functional layer 22 via the adhesive layer 30. The state of the substrate layer 11. Therefore, the peeling force for separating the laminate (1) 41 between the adhesive layer 30 and the first base layer 11 is greater than that for separating the laminate (1) 41 between the second functional layer 22 and the second base layer 11 . The peeling force that separates between the material layers 21 occurs. When detaching the second base material layer 21 from the laminate (1) 41 by utilizing the difference in the peeling force, since separation between the adhesive layer 30 and the first base material layer 11 is difficult to occur, the second base material layer 11 is unlikely to occur. 1 Separation between the base material layer 11 and the first functional layer 12 is relatively easy to occur between the second base material layer 21 and the second functional layer 22 . Therefore, the second base material layer 21 can be peeled suitably from the laminated body (1) 41 .

On the other hand, for example, in the laminated body 41p shown in FIG. In the case where the position is the same or on the inner side compared to the position (the above [b] is not satisfied), when the second base material layer 21p is intended to be peeled off, the laminate 41p is not placed between the second base material layer 21p and the second function. Separation occurs between the layers 22p, and separation occurs between the first base material layer 11p and the first functional layer 12p, so that the second base material layer 21 cannot be peeled off from the laminated body 41.

In the laminated body (1) 41, by making the positions of the ends of the adhesive layer 30 satisfy all of the above-mentioned relationships [a] to [c] as described above, the second base material layer 21 can be easily peeled off, and the laminated body can be easily removed. (1) 41 separates between the 2nd base material layer 21 and the 2nd functional layer 22p, Therefore, the laminated body (2) 42 (FIG. 3) mentioned later can be obtained easily.

In the laminated body (1) 41 shown in FIG. 1 , the force required for separating specific layers, that is, the peeling force can be set as follows. The force required to separate the laminate (1) 41 between the first base material layer 11 and the first functional layer 12, that is, the peeling force (i), can be as follows: The force required for separation from the second functional layer 22 , that is, the peeling force (ii) or more may be less than or equal to the peeling force (ii). The peel force (iii), which is the force required to separate the laminate (1) 41 between the adhesive layer 30 and the first base material layer 11, is preferably greater than the peel force (i) and the peel force (ii). The peel force can be measured, for example, using a precision universal testing machine AGS series (manufactured by Shimadzu Corporation).

(Manufacturing method of laminate (1))

(a) and (b) of FIG. 2 are schematic cross-sectional views schematically showing an example of the manufacturing process of the laminate (1) 41 . In the figure, W represents the width direction. The manufacturing method of laminated body (1) comprises:

A step of preparing the first lamination part 10 including the first base material layer 11 and the first functional layer 12 (FIG. 2(a));

The process of preparing the second lamination part 20 including the second base material layer 21 and the second functional layer 22 ( FIG. 2( b )); and

A step of laminating the first lamination part 10 and the second lamination part 20 so that the first functional layer 12 and the second functional layer 22 face each other via the adhesive layer 30 ( FIG. 1 ).

As shown in FIG. 2( a ), the first lamination part 10 may be a lamination part as long as it has the first functional layer 12 on the first base material layer 11 .

When the first functional layer 12 is a resin film, the first base material layer 11 and the first functional layer 12 can be bonded together in a detachable manner using an adhesive or an adhesive to prepare the first functional layer 12. Lamination section 10.

In the case where the first functional layer 12 is the first liquid crystal layer, the composition for forming a liquid crystal layer comprising a polymerizable liquid crystal compound can be coated on the first base material layer 11, and on the first base material layer 11 The first lamination part 10 is prepared by polymerizing a polymerizable liquid crystal compound to form the first functional layer 12 .

As exemplified in JP2017-083843A1, by forming the first functional layer 12 with a composition for forming a liquid crystal layer containing a dichroic dye, the first functional layer can be made into a polarizing layer.

In addition, as exemplified in Korean Patent No. 10-1586736, a touch sensor layer can be formed as the first functional layer.

As shown in FIG. 2( b ), the second lamination part 20 may be a lamination part as long as it has the second functional layer 22 on the second base material layer 21 .

When the second functional layer 22 is a resin film, the second base material layer 21 and the second functional layer 22 can be bonded together in a detachable manner using an adhesive or an adhesive to prepare the second functional layer 22. Lamination section 20 .

In the case where the second functional layer 22 is the first liquid crystal layer, the composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound can be coated on the second base material layer 21, and then formed on the second base material layer 21 The first lamination part 10 is prepared by polymerizing a polymerizable liquid crystal compound to form the second functional layer 22 .

As exemplified in JP2017-083843, by forming the second functional layer 12 with a composition for forming a liquid crystal layer containing a dichroic dye, the second functional layer can be made into a polarizing layer.

In addition, as exemplified in Korean Patent No. 10-1586736, a touch sensor layer can be formed as the second functional layer.

The step of laminating the first lamination part 10 and the second lamination part 20 may include the following steps: at least one of the first functional layer 12 side of the first lamination part 10 and the second functional layer 22 side of the second lamination part 20 Or form an adhesive composition layer for forming the adhesive layer 30 . The step of laminating the first lamination part 10 and the second lamination part 20 may include a step of laminating the first lamination part so that the first functional layer 12 and the second functional layer 22 face each other with the adhesive composition layer interposed therebetween. 10 and the second lamination part 20, and an adhesive layer 30 is formed from an adhesive composition layer. The process of forming the adhesive layer 30 from the adhesive composition layer may be appropriately performed according to the components contained in the adhesive composition layer. For example, when it is necessary to cure the adhesive composition layer, it may be performed The step of curing treatment is sufficient, and if curing treatment is unnecessary, the adhesive composition layer may be directly used as an adhesive layer.

When there is a step of forming an adhesive composition layer on the first laminated part 10, the adhesive composition layer is preferably positioned so that at least one end in the width direction is the same as the end of the first functional layer 12. It is formed so as to be outside in the width direction and to be at the same position as the end of the first base material layer 11 or to be inside in the width direction. When there is a step of forming an adhesive composition layer on the second laminated part 20, when the first laminated part 10 and the second laminated part 20 are laminated, the adhesive composition layer is preferably such that at least The position of one end is the same as the position of the end of the second functional layer 22 or formed so as to be on the inner side in the width direction than this position.

The first laminated part 10 and the second laminated part 20 used in the manufacturing method of the laminated body (1) 41 may be a single film or a long film.

The laminated body (1) and its manufacturing method can be changed as modified examples shown below. In addition, it is possible to arbitrarily combine the above-mentioned embodiment and the modified examples described below.

(Modification 1 of Embodiment 1)

The position of the end portion in the width direction of the adhesive layer 30 may be a position satisfying all the above-mentioned relationships [a] to [c] at one end portion of the laminate (1) in the width direction, or may be a position at the end of the laminate (1) in the width direction. ) at a position where both ends in the width direction satisfy all of the above-mentioned relationships of [a] to [c].

(Modification 2 of Embodiment 1)

The laminate (1) 41 may further include other layers in addition to the first base material layer 11 , the first functional layer 12 , the adhesive layer 30 , the second functional layer 22 , and the second base material layer 21 . For example, the laminate (1) 41 may further have an adhesive layer and a release film in this order on the surface of the first base material layer opposite to the first functional layer.

For example, when the first functional layer 12 is a first liquid crystal layer, a first alignment layer may be further provided between the first base material layer 11 and the first functional layer 12 . When the second functional layer 22 is a second liquid crystal layer, a second alignment layer may be further provided between the second base material layer 21 and the second functional layer 22 . In the case where the first functional layer 12 is the first liquid crystal layer and the second functional layer 22 is the second liquid crystal layer, in the method for producing the laminate (1), the first lamination part may also be formed on the first substrate layer 11. There is a first alignment layer between the first functional layer 12 and the second laminated part may have a second alignment layer between the second base material layer 21 and the second functional layer 22 .

When there is a first alignment layer between the first base material layer 11 and the first functional layer 12, at least one end of the laminate (1) 41 in the width direction, the end of the first alignment layer may be aligned with the first alignment layer. The end of the first base material layer 11 is the same as or located on the inner side in the width direction than the end, and may be at the same position as the end of the first functional layer 12, or may be located on the inner side in the width direction than the end. or outside in the width direction.

When there is a second alignment layer between the second base layer 21 and the second functional layer 22, at least one end of the laminate (1) 41 in the width direction, the end of the second alignment layer may be The end of the second base material layer 21 is the same as or located on the inner side in the width direction than the end, and may be at the same position as the end of the second functional layer 22, or may be located on the inner side in the width direction than the end. or outside in the width direction.

[Embodiment 2 (laminated body (2) and its manufacturing method)]

(laminate (2))

Fig. 3 is a schematic cross-sectional view schematically showing an example of a laminate (2). In the figure, W represents the width direction. As shown in Figure 3, the laminate (2) 42 includes the first base material layer 11, the first functional layer 12, the adhesive layer 30 and the second 'functional layer 22' in sequence,

At least one end in the width direction of the laminate (2) 42, the position of the end of the adhesive layer 30 satisfies all of the following relationships [a], [b], and [d]:

[a] same as the position of the end of the first base material layer 11 or on the inner side in the width direction than this position;

[b] It is outside in the width direction compared with the position of the end of the first functional layer 12;

[d] is the same as the position of the end of the 2nd' functional layer 22'.

In addition, the positions of the respective ends described in the requirements of [a], [b], and [d] above are positions in the cross-section in the width direction of the laminated body (2) 42, and the positions of the ends of the respective layers are defined below. When it is related, it is also the position in the width direction cross-section of the laminated body (2) 42 .

The laminated body (2) 42 may be a single film or a long film.

The 1st base material layer 11 and the 1st functional layer 12 are the same as the 1st base material layer 11 and the 1st functional layer 12 demonstrated in the previous embodiment.

The 2nd' functional layer 22' may be an optical film exhibiting optical properties such as polarization properties or an optical compensation function, a liquid crystal layer, a layer constituting a touch sensor, etc., and may be a resin film or a liquid crystal layer.

The 2' functional layer 22' is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the 2' functional layer 22' as a liquid crystal layer may be referred to as "2nd' liquid crystal layer"). The second' functional layer 22' may be, for example, a cured film formed by polymerizing a polymerizable liquid crystal compound. The 2nd' functional layer 22' may be a layer derived from the 2nd functional layer 22 as described later. The 2nd' functional layer 22' is more preferably a retardation layer.

Like the previous embodiment, the first base material layer 11 may be a film that can be peeled off from the first functional layer 12, or may be a layer having a film that exhibits a polarization function.

The adhesive layer 30 bonds the second' functional layer 22' to the first base material layer 11 and the first functional layer 12. At least one end in the width direction of the laminate (2) 42, the position of the end of the adhesive layer 30 satisfies all of the above-mentioned relationships of [a], [b], and [d]. Specifically, in the cross-section of the laminate (2) 42 in the width direction, the end of the adhesive layer 30 is at the same position as the end of the first base material layer 11 or on the inner side in the width direction than the position, and The position of the edge part of the 1st functional layer 12 is located outside rather than the width direction, and it is located in the position of the edge part of the 2nd' functional layer 22'.

At least one end in the width direction of the laminated body (2) 42 shown in FIG. And it is outside in the width direction compared with the position of the edge part of the 2nd' functional layer 22'. Furthermore, in at least one end of the laminate (2) 42 in the width direction, the position of the end of the first functional layer 12 is located inside the width direction of the position of the end of the second' functional layer 22'.

The laminated body (2) 42 can be obtained by peeling the 2nd base material layer 21 from the laminated body (1) 41 as mentioned later. The laminated body (2) 42 can be used to manufacture the laminated body (3) mentioned later.

(Manufacturing method of laminate (2))

(a) and (b) of FIG. 4 are schematic cross-sectional views schematically showing an example of the manufacturing process of the laminated body (2). In the figure, W represents the width direction. The laminated body (1) 41 shown in FIG. 4 (a) has the same structure as the laminated body (1) 41 shown in FIG. 1, and the laminated body (2) 42 shown in FIG. The laminated body (2) 42 shown in 3 has the same structure. The manufacturing method of laminated body (2) comprises:

The process of preparing the laminated body (1) 41 ((a) of FIG. 4); and

The process of peeling the 2nd base material layer 21 from the laminated body (1) 41 ((b) of FIG. 4).

The laminated body (1) can be prepared by the method already explained in the previous embodiment. The laminated body (1) is as described in the previous embodiment.

In the laminated body (1) 41, the second base material layer 21 can be peeled from the second functional layer 22, and the position of the end of the adhesive layer 30 at at least one end in the width direction of the laminated body (1) 41 is All the relationships of [a] to [c] above are satisfied. Therefore, by peeling off the 2nd base material layer 21 from the laminated body (1) 41, the laminated body (2) 42 shown in FIG.3 and FIG.4(b) can be obtained.

In the width direction cross-section of the laminated body (1) 41 shown in FIG. The region of the bonding layer 30 , that is, the region 22 y in which the adhesive layer is not formed (in FIG. 4( a ), a portion indicated by upper right oblique lines). The adhesive layer forming region 22x is a region provided on the adhesive layer 30, so even if the second base material layer 21 is peeled off, the adhesive layer forming region 22x is fixed to the adhesive layer 30 and is difficult to attach to the second base material layer. Layer 21 was peeled off together. On the other hand, since the adhesive layer non-formed region 22y is not fixed to the adhesive layer 30, it is easy to peel off together with the second base material layer 21. Therefore, when the second base material layer 21 is peeled off from the laminate (1) 41, as shown in FIG. The second functional layer 22 is divided so that the unformed region 22y exists on the second base material layer 21, and the adhesive layer forming region 22x existing on the adhesive layer 30 becomes the second 'functional layer 22'. Therefore, the laminated body (2) 42 can be obtained by peeling the 2nd base material layer 21 from the laminated body (1) 41.

The laminated body (1) 41 used in the manufacturing method of the laminated body (2) 42 may be a single film or a long film.

The laminated body (2) and its manufacturing method can be changed as modified examples shown below. It is possible to arbitrarily combine the above-described embodiment and the modified examples described below.

(Modification 1 of Embodiment 2)

The position of the end of the adhesive layer 30 may be a position that satisfies all the above-mentioned relationships of [a], [b], and [d] at one end of the laminate (2) 42 in the width direction, or may be at a position where (2) Both ends of the width direction of 42 satisfy all the above-mentioned relationships of [a], [b], and [d].

(Modification 2 of Embodiment 2)

The laminate (2) 42 may further include other layers in addition to the first base material layer 11, the first functional layer 12, the adhesive layer 30, and the second' functional layer 22'. The laminate (2) 42 may further have an adhesive layer and a separator on the side of the first base material layer 11 opposite to the first functional layer 12 .

When the first functional layer 12 is a first liquid crystal layer, a first alignment layer may be further provided between the first base material layer 11 and the first functional layer 12 . When the 2' functional layer 22' is the 2' liquid crystal layer, a second alignment layer may be further provided on the side opposite to the adhesive layer 30 of the 2' functional layer 22'.

When the laminate (2) 42 has a first alignment layer between the first base material layer and the first functional layer, at least one end in the width direction of the laminate (2) 42, the first alignment layer The end portion may be the same as the end portion of the first base material layer or located on the inner side in the width direction than the end portion, or may be at the same position as the width end portion of the first functional layer, or may be at the same position as the end portion of the first functional layer. The position of the width end is located on the inner side or the outer side in the width direction.

In the case where the laminate (2) 42 has a second alignment layer, at least one end in the width direction of the laminate (2) 42, the end of the second alignment layer may be the same as the end of the 2′ functional layer. The same position may be located on the inner side in the width direction than this position.

When the laminate (2) is obtained by peeling the second base material layer from the laminate (1), the laminate (1) may have a first alignment layer and a second alignment layer. When the laminate (1) has a second orientation layer between the second base layer and the second functional layer, the laminate (2) can be obtained by peeling off the second orientation layer together with the second base layer. ), the second base material layer may be peeled off in such a manner that the second alignment layer exists on the 2' functional layer. In this case, the second alignment layer in the laminate (1) can be divided into a region existing on the second base material layer and a region existing on the second base material layer when the second base material layer is peeled similarly to the second functional layer. 2' area on functional layer.

From the laminate (1) including the second alignment layer, the second alignment layer is peeled together with the second base layer or only the second base layer is peeled off to utilize the second base layer, the second alignment layer, and the second function. The peeling force between each layer in the layer is adjusted. The peeling force can be adjusted by, for example, the components contained in each layer and the surface treatment performed on the surface of each layer. For example, the peeling force between the second alignment layer and the second base layer or the second functional layer can be determined by the type or amount of additives contained in the second alignment layer or the second functional layer, the effect on the second base layer The surface on the side of the second alignment layer or the surface of the second alignment layer provided on the second substrate layer is subjected to surface treatment such as corona treatment, plasma treatment, and flame treatment.

[Embodiment 3 (laminated body (3) and its manufacturing method)]

(laminate (3))

Fig. 5 is a schematic cross-sectional view showing an example of a laminate (3). In the figure, W represents the width direction. As shown in FIG. 5 , the laminate (3) 51 of this embodiment includes a laminate (2) 42 (that is, the first base material layer 11, the first functional layer 12, the adhesive layer 30, and the second' functional layer 22 ') and optical film 60 (resin film),

On the side of the 2' functional layer 22 of the laminate (2) 42, the optical film 60 is laminated via the adhesive layer 36 for an optical film (adhesive layer for a resin film).

The laminate (3) 51 may be a single film or a long film.

As shown in FIG. 5 , the laminate (3) 51 sequentially includes the first base material layer 11, the first functional layer 12, the adhesive layer 30, the second 'functional layer 22', the adhesive layer 36 for an optical film, and the optical film. 60. As described in the previous embodiment, the laminate (2) 42 sequentially includes the first base material layer 11, the first functional layer 12, the adhesive layer 30, and the second' functional layer 22'.

The optical film 60 may be an optical film having a polarizing layer, or may be a retardation layer. In at least one of the ends in the width direction of the laminate (3) 51, the end of the optical film 60 may be at the position of the end of the second 'functional layer 22' or the position of the end of the adhesive layer 30. The same position may be the same position as the position of the end of the first functional layer, may be the same position as the position of the end of the first base material layer 11 , or may be different from these positions.

In addition, the position of each edge part of each layer which comprises the laminated body (3) 51 is the position in the width direction cross-section of the laminated body (3) 51.

The optical film adhesive layer 36 adheres the optical film 60 to the second' functional layer 22'. The end of the adhesive layer 36 for an optical film may be at least one end in the width direction of the laminated body (3) 51 shown in FIG. In particular, by making the end of the above-mentioned adhesive layer 36 for an optical film the same as the end of the optical film 60 or positioned on the inner side in the width direction compared with the end, and positioned on the outermost side in the width direction of the laminated body (2) 42 The ends of the layer are the same or located on the inner side in the width direction compared with the end, so that the adhesive layer 36 for optical films can prevent the adhesive layer 36 for optical films from seeping out from the laminate (3) to contaminate the conveyance path, etc., Therefore preferred.

The end portion of the adhesive layer 36 for an optical film is the same as or compared with the end portion of the first functional layer 12 in at least one of the end portions in the width direction of the laminated body (3) 51 shown in FIG. 5 located on the inside in the width direction.

The laminated body (3) 51 may be used in order to obtain the optical laminated body 52 ((b) of FIG. 6) as mentioned later. For example, the optical laminated body 52 can be obtained by peeling the 1st base material layer 11 from the laminated body (3)51.

The details will be described later, the intermediate layer 45 (including the second 'functional layer 22', the second 'functional layer 22', The layer of the adhesive layer 30 and the first functional layer 12) is divided into a region on the outer side in the width direction (hereinafter sometimes referred to as an "outer region") than an end portion of the adhesive layer 36 for an optical film and a region on the inner side in the width direction. region (hereinafter sometimes referred to as "inner region") ((a) and (b) of FIG. 6 ).

As described above, in the laminated body (3) 51, when the position of the end portion of the adhesive layer 36 for an optical film is the same as the position of the end portion of the first functional layer 12 or is located on the inner side in the width direction than this position Next, the outer region of the intermediate layer 45 divided by the peeling of the first base material layer 11 has a region where the adhesive layer 30 is bonded to the first base material layer 11, and the inner region becomes a region on the first base material layer. A region where the first functional layer 12 or a part thereof exists on the region 11 ((a) and (b) of FIG. 6 ).

As described in the previous embodiment, since the first base material layer 11 can be peeled off from the first functional layer 12, it is difficult to separate between the first base material layer 11 and the adhesive layer 30 in the outer region, and Separation easily occurs between the first base material layer 11 and the first functional layer 12 in the inner region. Therefore, when the first base material layer 11 is peeled off from the laminate (3) 51, the middle is divided so that the outer region exists on the first base material layer 11 and the inner region exists on the adhesive layer 36 for an optical film. The layer 45 can separate the first substrate layer and the first functional layer in the inner region. Therefore, the optical laminated body 52 can be obtained by peeling the 1st base material layer 11 from the laminated body (3) 51 ((b) of FIG. 6).

(Manufacturing method of laminate (3))

The manufacturing method of laminated body (3) 51 (FIG. 5) has:

A step of preparing the laminated body (2) 42 ((b) of FIG. 3 or FIG. 4); and

A step of laminating an optical film 60 (resin film) on the side of the second' functional layer 22' of the laminate (2) 42 via the adhesive layer 36 for an optical film (adhesive layer for a resin film) (Fig. 5 ).

The laminated body ( 2 ) can be prepared by the production method described in the previous embodiment as shown in FIG. 3 or (b) of FIG. 4 . The laminated body (2) 42 is as described in the previous embodiment. In addition, the optical film 60 and the adhesive layer 36 for optical films are as in the above-mentioned description.

The optical film 60 can be formed, for example, on at least one of the 2nd 'functional layer 22' side of the laminate (2) 42 and the optical film 60, an adhesive for an optical film for forming the adhesive layer 36 for an optical film. composition layer, and the optical film 60 and the 2nd' functional layer 22' are laminated together. As a method of forming the adhesive layer 36 for an optical film from an adhesive composition layer for an optical film, it may be appropriately performed according to the components contained in the adhesive composition layer for an optical film. When the adhesive composition layer is cured, the step of performing a curing treatment may be performed. If no curing treatment is required, the adhesive composition layer for an optical film may be directly used as an adhesive layer for an optical film.

In laminated body (3) 51 shown in FIG. In this case, it is preferable to arrange so that the position of the edge part of the adhesive composition layer for optical films is the same as the position of the end part of the width direction of the 1st functional layer 12, or it is located in the width direction inner side than this position. For example, when there is a step of forming an adhesive composition layer for an optical film on the 2nd 'functional layer 22' side of the laminate (2) 42, it is only necessary to make the end of the adhesive composition layer for an optical film The position may be the same as the position of the end portion in the width direction of the first functional layer 12 or may be formed so as to be located on the inner side in the width direction than the position. In addition, when there is a step of forming an adhesive composition layer for an optical film on the optical film 60, when the optical film 60 and the laminate (2) 42 are laminated through the adhesive composition layer for an optical film, it is preferable The position of the end part of the width direction of the adhesive composition layer for optical films is the same as the position of the end part of the width direction of the 1st functional layer 12, or it is formed so that it may be located inside the width direction.

The laminated body ( 2 ) 42 used in the manufacturing method of the laminated body ( 3 ) 51 may be a single film or a long film. In addition, the optical film may be a single film or a long film.

The laminated body (3) and its manufacturing method can be changed as modified examples shown below. In addition, it is possible to arbitrarily combine the above-mentioned embodiment and the modified examples described below.

It should be noted that the laminated body (3) may further have a layer on the side opposite to the adhesive composition layer for optical films of the optical film 60, for example, it may be formed on the opposite side of the adhesive composition layer for optical films 60 of the optical film 60. One side has an adhesive layer and a release film in this order.

(Modification 1 of Embodiment 3)

At least one end in the width direction of the laminate (3) 51, the position of the end in the width direction of the adhesive layer for an optical film may be outside in the width direction compared to the position of the end in the width direction of the first functional layer. . In this case, even if the first base material layer is peeled from the laminate (3) 51, in the inner region of the intermediate layer 45 (in the width direction cross-section of the laminate (3) 51, the distance between the adhesive layer for the optical film and the adhesive layer for the optical film Since the position of the end portion is located on the inner side than the region) also includes the region where the adhesive layer is bonded to the first base material layer, separation between the first base material layer and the first functional layer is less likely to occur. When the position of the end portion in the width direction of the adhesive layer for an optical film is on the outside in the width direction compared with the position of the end portion in the width direction of the first functional layer, the end portion in the width direction of the first functional layer 12 The first base material layer 11 can be peeled from the laminate (3) 51 by removing the end of the laminate (3) 51 at the position of the laminated body (3) 51 or a position closer to the inner side in the width direction than this position.

(Modification 2 of Embodiment 3)

In the laminate (3) 51, for example, a release film (resin film) can be used instead of the optical film, and an adhesive layer for a laminate (adhesive layer for resin film) can be used instead of the adhesive layer 36 for the optical film. An optical film such as a polarizing plate may be used instead of the first base material layer 11 constituting the laminate (3) 51 .

For example, an adhesive layer for a laminate can be used in order to bond the laminate (3) to an optical display element by peeling the release film at an appropriate timing.

(Modification 3 of Embodiment 3)

In the laminated body (3) 51, when the first functional layer 12 is the first liquid crystal layer and the second' functional layer 22' is the second' liquid crystal layer, for example, the first substrate layer 11 and the first A first alignment layer may be further provided between the functional layers, and a second alignment layer may be further provided between the second 'functional layer 22' and the adhesive layer 36 for optical films.

In the case where the laminate (3) 51 has a first alignment layer, the end of the first alignment layer may be at least one end in the width direction of the laminate (3) the same as or the same as the end of the first base material layer. The end portion may be located on the inner side in the width direction, may be the same as the end portion of the first functional layer, or may be located on the inner side or the outer side in the width direction than the end portion. In the case where the laminate (3) 51 has a second alignment layer, the position of the end of the second alignment layer may be the same as the position of the end of the second 'functional layer 22', or it may be at a width greater than this position. direction inside.

In the case where the laminate (3) has the second alignment layer, it is only necessary to prepare the laminate (2) and the optical film having the second alignment layer, and then place the optical film on the side of the second alignment layer of the laminate (2). The adhesive layer 36 may be laminated with an optical film.

[Embodiment 4 (Method for Manufacturing Optical Laminate)]

FIG. 6 is a schematic cross-sectional view schematically showing an example of a manufacturing process of an optical layered body. In the figure, W represents the width direction.

The laminated body ( 3 ) 51 shown in FIG. 6( a ) has the same structure as the laminated body ( 3 ) 51 shown in FIG. 5 . The manufacturing method of the optical laminated body 52 includes:

A step of preparing a laminate (3) 51 ((a) of FIG. 6 ); and

The process of peeling the 1st base material layer 11 from the laminated body (3) 51 ((b) of FIG. 6).

As shown in FIG. 6( b ), the optical laminate 52 includes a first 'functional layer 12', an adhesive layer 30', a second "functional layer 22", an optical film adhesive layer 36, and an optical film 60 in this order. As described in the previous embodiment, the laminate (3) 51 includes the first functional layer 12, the adhesive layer 30, the second 'functional layer 22', the adhesive layer 36 for an optical film, and the optical film 60 in this order.

At least one end in the width direction of the optical laminate 52, for example, as shown in (b) of FIG. The positions of the ends of the bonding layers 36 are the same. In the optical laminated body 52 shown in FIG. 6( b ), the position of the end of the optical film 60 is shown on the outside in the width direction compared with the position of the end of the adhesive layer 36 for an optical film. It may be the inner side in the width direction, and may be the same as the position of the end of the adhesive layer 36 for optical films.

In addition, the position of each edge part of each layer which comprises the optical laminated body 52 is the position in the width direction cross section of the optical laminated body 52.

The first 'functional layer 12', the adhesive layer 30', and the second "functional layer 22" contained in the optical laminate 52 are obtained from the first functional layer 12, the adhesive layer 30' contained in the laminate (3) 51 layer 30 and the layer of the 2' functional layer 22'.

In the manufacturing method of the optical layered body 52, the layered body (3) 51 is as described in the previous embodiment.

As described in the previous embodiment, at least one end of the laminate (3) 51 in the width direction, the end of the adhesive layer 36 for an optical film is the same as or the same as the end of the first functional layer 12 . The end portion is located on the inner side in the width direction.

In the laminated body (3) 51 shown in FIG. The position of the end portion is on the outside in the width direction. Therefore, in the laminated body (3) 51 shown in FIG. Separation between the adhesive layers 30 is easy to occur between the first base material layer 11 and the first functional layer 12 inside the edge of the first functional layer.

As described above, in the laminated body (3) 51 shown in FIG. It is on the inner side in the width direction. Therefore, if it is desired to peel off the first base material layer 11 from the laminated body (3) 51, as shown in (a) and (b) of FIG. The area where the adhesive layer 36 is not provided and the area where the optical film adhesive layer 36 is not provided are divided, and the adhesive layer 30 on the side of the first base material layer 11 of the second 'functional layer 22' is also divided into layers that are laminated. In the width direction cross section of the body (3) 51, the part located outside and the part located in the inside are compared with the position of the edge part of the adhesive layer 36 for optical films. In addition, when the position of the end portion of the first functional layer 12 is in the width direction inner side than the position of the end portion of the adhesive layer 36 for optical film in the cross-section of the width direction of the laminated body (3) 51, the first The functional layer 12 is divided into a part on the outside and a part on the inside compared to the position of the end of the adhesive layer 36 for an optical film. When the position of the end of the first functional layer 12 is within the When the position of the end of the adhesive layer 36 for an optical film is the same in the cross section in the width direction, the first functional layer 12 is divided by the boundary portion in the width direction between the first functional layer 12 and the adhesive layer 30 .

In this way, if the first base material layer 11 is peeled off from the laminated body (3) 51 shown in FIG. 2'The functional layer 22', the adhesive layer 30, and the intermediate layer 45 of the first functional layer 12 are divided into an outer region (Fig. ) and (b), the part indicated by the downward slash to the right) and the inner area on the inner side in the width direction. The outer region has a region where the adhesive layer 30 is bonded to the first base material layer 11, and the inner region is a region where the first functional layer 12 or a part thereof exists on the first base material layer 11. Therefore, in the outer region Separation between the first base material layer 11 and the adhesive layer 30 does not easily occur, but, in the inner region, the first base material layer 11 can be peeled off from the first functional layer 12, and therefore, the separation between the first base material layer 11 is easy to occur. Separation from the first functional layer 12. Therefore, when the first base material layer 11 is peeled off from the laminate (3) 51, as shown in FIG. By dividing the intermediate layer 45 so that an inner region exists on the bonding layer 36, the first base material layer and the first functional layer can be separated at the inner region. As a result, it is possible to obtain an optical laminate 52 in which the positions of the ends of the first 'functional layer 12', the adhesive layer 30', the second "functional layer 22", and the adhesive layer 36 for an optical film are the same.

The method for producing the optical laminate 52 may further include a step of providing an adhesive layer for a laminate on the side of the first 'functional layer 12' of the optical laminate 52 opposite to the adhesive layer 30'. In order to bond an optical laminate to an optical display element, an adhesive layer for laminates can be used.

The laminated body (3) 51 used in the manufacturing method of the optical laminated body 52 may be a single film or a long film.

In the optical laminate 52, the optical film 60 is used as a linear polarizing plate, the second "functional layer 22" is used as a 1/2 wave plate, and the first 'functional layer 12' is used as a 1/4 wave plate. , so that the optical laminate 52 can be made into a circularly polarizing plate. By making the optical film 60 a linear polarizing plate, making the second "functional layer 22" a 1/4 wavelength plate with reverse wavelength dispersion, and making the first 'functional layer 12' a positive C plate, it is also possible to The optical laminated body 52 is made into a circularly polarizing plate.

The optical layered body 52 and its manufacturing method can be changed as modified examples shown below. It is possible to arbitrarily combine the above-described embodiment and the modified examples described below.

(Modification 1 of Embodiment 4)

The optical laminate 52 may further include other layers in addition to the first 'functional layer 12', the adhesive layer 30', the second "functional layer 22", the adhesive layer 36 for an optical film, and the optical film 60. In the case where the 1' functional layer 12 is the 1' liquid crystal layer, and the 2nd" functional layer 22" is the 2nd" liquid crystal layer, the optical laminate 52 can, for example, be bonded between the 1' functional layer 12' and The layer 30' has a first alignment layer on the opposite side, and may have a second alignment layer between the second "functional layer 22" and the adhesive layer 36 for an optical film.

When the optical laminate has a first alignment layer, at least one end in the width direction of the optical laminate, the end of the first alignment layer may be at the same position as the end of the first 'functional layer 12', It may be a position on the inner side in the width direction than this position. When an optical laminate has a 1st alignment layer, the laminate (3) used for manufacture of this optical laminate has a 1st alignment layer.

When the laminate (3) has a first alignment layer between the first base material layer and the first functional layer, the first alignment layer is peeled off together with the first base material layer to obtain (b) of Figure 6 In the illustrated optical laminate 52 , the first base material layer may be peeled off so that the first alignment layer exists on the first 'functional layer 12'. In this case, the first alignment layer in the laminated body (3) may be divided so as to be opposite to the end in the width direction of the adhesive layer 36 for an optical film when the first base material layer is peeled similarly to the intermediate layer 45 . than the area on the outside in the width direction and the area on the inside in the width direction.

When the optical laminate has a second alignment layer, at least one end in the width direction of the optical laminate, the end of the second alignment layer may be at the same position as the end of the second "functional layer 12", It may be a position on the inner side in the width direction than this position. When an optical laminate has a 2nd alignment layer, the laminate (3) used for manufacture of this optical laminate has a 2nd alignment layer.

(Modification 2 of Embodiment 4)

In the manufacturing method of the optical laminated body 52, the laminated body containing a peeling film can be manufactured by using a peeling film and the adhesive layer for laminated bodies instead of an optical film and the adhesive layer for optical films. In the manufacturing method of an optical laminated body, you may have the process of providing an optical film via the adhesive layer for optical films on the side of the 2' functional layer opposite to an adhesive layer.

The embodiments and modifications of the present invention have been described above, but the present invention is not limited to these embodiments and modifications thereof. After the process is combined, it will be implemented. Hereinafter, items common to all the embodiments and modifications thereof will be described in detail.

(1st substrate layer and 2nd substrate layer)

The first base material layer and the second base material layer (hereinafter, both may be collectively referred to as "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. Specifically, polyolefin-based resins such as polyethylene and polypropylene; cyclic polyolefin-based resins such as norbornene-based polymers; polyethylene terephthalate, polyethylene naphthalate, etc. Polyester resins such as (meth)acrylic acid, polymethyl (meth)acrylate and other (meth)acrylic resins; cellulose esters such as triacetyl cellulose, diacetyl cellulose and cellulose acetate propionate Vinyl alcohol-based resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate-based resins; polystyrene-based resins; polyarylate-based resins; polysulfone-based resins; polyethersulfone-based resins; polyamide-based resins ; Polyimide resins; polyether ketone resins; polyphenylene sulfide resins; polyphenylene ether resins; and their mixtures, copolymers, etc. Among these resins, it is preferable to use any one of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth)acrylic resins, or a mixture thereof. In addition, said "(meth)acrylic acid" means "at least 1 sort(s) of acrylic acid and methacrylic acid."

The base layer may be a film exhibiting mold release properties, or may be a layer having a film exhibiting a polarizing function. The base material layer may be a resin film applied as a bendable front panel.

<front panel>

The front panel is a panel that suppresses warpage of image display elements such as liquid crystal cells or protects the image display elements, and is, for example, a translucent (preferably optically transparent) plate-shaped body. The front panel can be a single-layer structure or a multi-layer structure.

Since the front panel is disposed on the outermost surface of the final product including the polarizing plate of the present invention, it is required to exhibit sufficient durability even when used outdoors or semi-outdoors. From such a viewpoint, the front panel is preferably made of an inorganic material such as glass or tempered glass, and a polymer film having a Young's modulus of 2 GPa or more. Inorganic materials such as glass and tempered glass are suitable, especially for flexible displays, and resin films are suitable. Among them, polyamide films, polyamideimide films or polyimide films, polyester films, and olefin films are preferred. , Acrylic film, cellulose film. It is also preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles, etc. in the polymer film.

The flexible front panel including the resin film may have a hard coat layer on at least one side. The hard coat layer can be provided on the surface of the resin film by a known method.

The base material layer may be a single layer obtained by mixing one or more resins, or may have a multilayer structure of two or more layers. In the case of having a multilayer structure, the resins constituting the respective layers may be the same or different from each other. When the base material layer is a film formed of a resin material, arbitrary additives may be added to the base material layer. Examples of additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-colorants, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.

The thickness of the base material layer is not particularly limited, but generally, it is preferably 1 to 300 μm, more preferably 10 to 200 μm, and even more preferably 30 to 120 μm from the viewpoint of handleability such as strength and handleability.

(1st alignment layer and 2nd alignment layer)

The laminates (1) to (3) and the optical laminates may include the first alignment layer and the second alignment layer (hereinafter both may be collectively referred to as "alignment layer") having a The polymerizable liquid crystal compound has an alignment control force for aligning liquid crystals in a desired direction. As the alignment layer, an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove having a concavo-convex pattern or a plurality of grooves (groove) on the surface of the layer are exemplified. orientation layer. The thickness of the alignment layer is usually 10 to 500 nm, preferably 10 to 200 nm.

The alignment polymer layer can be formed by applying a composition in which an alignment polymer is dissolved in a solvent to a substrate layer, removing the solvent, and performing a rubbing treatment if necessary. In this case, in the alignment polymer layer formed of the alignment polymer, the alignment control force can be arbitrarily adjusted by using the surface state of the alignment polymer or rubbing conditions.

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 the substrate layer, and irradiating polarized light. In this case, in the photo-alignment polymer layer, the alignment control force can be arbitrarily adjusted by the polarized light irradiation conditions etc. with respect to a photo-alignment polymer.

The groove alignment layer can be formed by, for example, the method of forming a concave-convex pattern by exposing and developing through an exposure mask having pattern-shaped slits on the surface of the photosensitive polyimide film; A method in which an uncured layer of an active energy ray-curable resin is formed on a plate-shaped master of a groove, and then the layer is transferred to a substrate layer and cured; forming an uncured layer of an active energy ray-curable resin on a substrate layer The cured layer is further formed by pressing a roll-shaped master plate having irregularities against the layer to form irregularities and then solidified.

(1st functional layer and 2nd functional layer)

The first functional layer and the second functional layer (hereinafter both may be collectively referred to as "functional layers") include optical films exhibiting optical properties such as polarization characteristics and optical compensation functions, liquid crystal layers, and layers constituting a touch sensor. It is a resin film, and may be a liquid crystal layer.

As an optical film in the said functional layer, the optical film etc. mentioned later are mentioned. As the resin film, a retardation film, a polarizing layer, and a layer constituting a touch sensor are preferable, and a retardation film is more preferable.

The thickness of the resin film is usually not less than 5 μm and not more than 100 μm.

(optical film)

The optical film may be a polarizing layer, a polarizing plate with a protective layer formed on at least one side of the polarizing layer, a polarizing plate with a protective film in which a protective film is laminated on at least one side of the polarizing plate, a reflective film, a transflective reflective A film, a brightness enhancement film, an optical compensation film, a film with an antiglare function, a retardation film, etc. may be an optical film having one of them, or may have a multilayer structure having two or more of them. In addition, the optical film may contain a liquid crystal layer, and the liquid crystal layer may be a retardation layer. In the present specification, "polarizing layer" refers to a layer having a property of transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis when unpolarized light is incident.

As the polarizing layer that can be included in the optical film, it may be a polarizing layer in which a dichroic dye is adsorbed and aligned on a single-layer polyvinyl alcohol resin film, or a polarizing layer in which a dichroic dye is adsorbed and aligned on a base film. A laminated film consisting of two or more layers of polyvinyl alcohol resin. In addition, the polarizing layer may be a cured film obtained by aligning a dichroic dye with a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. In this case, the polarizing layer may also be a liquid crystal layer.

The liquid crystal layer that may be contained in the optical film may be a liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound. The liquid crystal layer can be polymerized by applying a composition for forming a liquid crystal layer comprising a polymerizable liquid crystal compound on the substrate layer or an alignment layer provided on the substrate layer, drying, and then irradiating active energy rays such as ultraviolet rays. The liquid crystal compound is formed by polymerizing and curing it.

<Retardation film>

The retardation film is a film that imparts a retardation in a direction (in-plane direction of the film) perpendicular to the traveling direction of incident light. The aforementioned retardation film may be a stretched retardation film produced by stretching a polymer film such as a cellulose-based film, an olefin-based film, or a polycarbonate-based film. The stretched retardation film may have a thickness of 200 μm or less, preferably 1 μm to 100 μm. When thickness exceeds 200 micrometers, flexibility may fall.

Furthermore, as another example of the retardation film mentioned above, a liquid crystal coating type retardation film formed by coating a liquid crystal composition on a polymer film may be used. The above-mentioned liquid crystal composition contains a liquid crystal compound having a property of exhibiting a liquid crystal state such as nematic, cholesteric, and smectic. Any compound including liquid crystal compounds in the liquid crystal composition has a polymerizable functional group. The above liquid crystal coating type retardation film can be produced by applying a liquid crystal composition on an alignment film and curing it to form a liquid crystal retardation layer in the same manner as described in the above liquid crystal polarizing layer.

In addition, the retardation film may be a single layer or a multilayer, or may be a laminate in which a stretched retardation film and a liquid crystal retardation film are laminated.

<Polarizing layer>

The polarizing layer can be a linear polarizing plate or a circular polarizing plate.

[Linear polarizing plate]

The linear polarizing plate may be a film-type polarizing plate produced by dyeing and stretching a polyvinyl alcohol (PVA) film. A dichroic dye such as iodine is adsorbed on the PVA-based film oriented by stretching, or the dichroic dye is oriented by stretching while being adsorbed on PVA, and polarizing performance is exhibited. In the production of the above-mentioned film-type polarizing plate, steps such as swelling, crosslinking by boric acid, washing with an aqueous solution, and drying may be included in addition to these. Stretching and dyeing processes may be performed on the PVA-based film alone, or may be performed in a state of being laminated with another film such as polyethylene terephthalate. The PVA-based film used is preferably 10 to 100 μm, and the draw ratio is preferably 2 to 10 times.

The above-mentioned film-type polarizing plate may have a protective film described later on at least one surface. When laminating and stretching with another base material, the base material may be peeled off after bonding a protective film on the surface of the polarizing plate, or the base material during stretching may be used as a protective film as it is.

Furthermore, as another example of the above polarizing plate, a liquid crystal coating type polarizing plate formed by coating a liquid crystal polarizing composition may be used. The above-mentioned liquid crystal polarizing composition may contain a liquid crystal compound and a dichroic dye compound. The above liquid crystal polarizing layer can be produced by coating a liquid crystal polarizing composition on an alignment film to form a liquid crystal polarizing layer. The thickness of the liquid crystal polarizing layer can be formed thinner than that of a film-type polarizing plate. The thickness of the above-mentioned liquid crystal polarizing layer may be 0.5-10 μm, preferably 1-5 μm.

The aforementioned alignment film can be produced, for example, by applying a composition for forming an alignment film on a substrate, and imparting alignment by rubbing, polarized light irradiation, or the like. The above-mentioned liquid crystal polarizing layer may be laminated after peeling and transferring from the substrate, or the above-mentioned substrate may be directly laminated. As a substrate, a polymer film exemplified as a protective film described later can be used.

As the above-mentioned protective film, as long as it is a transparent polymer film, the materials and additives used for the above-mentioned transparent substrate can be used. Preferable are cellulose-based films, olefin-based films, acrylic-based films, and polyester-based films. It may be a coating-type protective film obtained by applying a cation-curable composition such as an epoxy resin or a radical-curable composition such as an acrylate and curing it. Plasticizers, ultraviolet absorbers, infrared absorbers, colorants such as pigments or dyes, optical brighteners, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, Lubricants, solvents, etc. The thickness of the protective film may be 200 μm or less, preferably 1 μm to 100 μm. When thickness exceeds 200 micrometers, flexibility may fall.

[Circular polarizing plate]

The circular polarizing plate is a functional layer having a function of transmitting only right circularly polarized light components or left circularly polarized light components by laminating a λ/4 retardation plate on a linear polarizing plate. For example, it is used in the following applications: to block the outside light that is converted into right circularly polarized light and reflected by the organic EL panel to become left circularly polarized light, and to transmit only the light-emitting component of the organic EL, thereby suppressing reflection The image is easily observed due to the influence of light. In order to achieve the circular polarization function, the absorption axis of the linear polarizing plate and the slow axis of the λ/4 retardation plate need to be 45° in theory, but it is 45±10° in practice. The linear polarizing plate and the λ/4 retardation plate do not necessarily have to be laminated adjacent to each other, as long as the relationship between the absorption axis and the slow axis satisfies the above range. It is preferable to achieve complete circular polarization at all wavelengths, but it is not necessary for practical use. Therefore, the circular polarizing plate in the present invention also includes an elliptically polarizing plate. It is also preferable that a λ/4 retardation film is further laminated on the observation side of the linear polarizing plate to make the emitted light circularly polarized, thereby improving the visibility when wearing polarized sunglasses. Generally, the material of the retardation film is a material that exhibits larger birefringence as the wavelength becomes shorter, and a material that exhibits smaller birefringence as the wavelength becomes longer. In this case, the phase difference of λ/4 cannot be realized in the entire visible light region, so in many cases, the in-plane phase difference becomes λ/4 in the vicinity of 560 nm with high visibility to 100 to 180 nm, preferably 130 to 150 nm. to design. It is preferable to use a reverse dispersion λ/4 retardation plate using a material having a birefringence wavelength dispersion characteristic opposite to that of the usual one, since the visibility can be improved. As such a material, in the case of a stretched phase difference plate, materials described in Japanese Patent Application Laid-Open No. 2007-232873 and the like are preferably used, and in the case of a liquid crystal coating type phase difference plate, it is also preferably used in Materials described in JP-A-2010-30979.

In addition, as another method, a technique of obtaining a broadband λ/4 retarder by combining it with a λ/2 retarder is also known (Japanese Patent Application Laid-Open No. 10-90521). The λ/2 phase difference plate is also manufactured using the same material method as the λ/4 phase difference plate. The combination of the stretched phase difference plate and the liquid crystal coating type phase difference plate is optional, and when both are used, the film thickness can be reduced, so it is preferable.

There is also known a method of laminating a positive C plate on the circularly polarizing plate in order to improve oblique visibility (JP-A-2014-224837). The positive C plate can be a liquid crystal coating type phase difference plate, or a stretched type phase difference plate. The retardation in the thickness direction is -200 to -20 nm, preferably -140 to -40 nm.

[contact sensor]

A touch sensor is used as an input means. As a contact sensor, various types such as a resistive film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, and an electrostatic capacity method have been proposed, and any method may be used. Among them, the capacitance method is preferable. The capacitive touch sensor is divided into an active area and an inactive area located outside the active area. The active area is an area corresponding to a display screen area (display section) on the display panel, and is an area that senses a user's touch, and the inactive area is an area corresponding to a non-display screen area (non-display section) on the display device. Area. The touch sensor may include: a substrate with soft properties; a sensing pattern formed on the active area of the substrate; and a non-active area formed on the substrate for connecting with an external drive circuit by means of the sensing pattern and the flange portion. Each sensor line. As the substrate having a flexible property, the same material as that of the above-mentioned polymer film base material of the front panel can be used. In addition, since the base material can be peeled off, only the touch sensor part can be transferred to the laminated body and used.

The functional layer is preferably a liquid crystal layer containing a liquid crystal compound. The liquid crystal layer can be formed using a known polymerizable liquid crystal compound. The type of the polymerizable liquid crystal compound is not particularly limited, and rod-like liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used. In the case of using a polymerizable liquid crystal compound, a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound, a solvent, and, if necessary, various additives is coated on the alignment layer to form a coating film, and the coating film is cured, Thereby, a liquid crystal layer as a liquid crystal solidified layer can be formed. Alternatively, the liquid crystal layer can also be formed by applying the composition for forming a liquid crystal layer on the substrate layer to form a coating film, and stretching the coating film together with the substrate layer. The liquid crystal layer may be a retardation layer.

The composition for forming a liquid crystal layer may contain, in addition to the above-mentioned polymerizable liquid crystal compound and solvent, a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, and the like. As a polymerizable liquid crystal compound, a solvent, a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, etc., a well-known thing can be used suitably.

The thickness of the liquid crystal layer is usually not less than 0.1 μm and not more than 10 μm.

(peel film)

The release film functions as a spacer that supports the adhesive layer and is peelable from the adhesive layer. As a release film, the film which gave the release process, such as a silicone process, to the surface of the side of a base film supporting an adhesive layer is mentioned. As a resin material which comprises a base material film, the resin material similar to the resin material which comprises the said 1st base material layer and the 2nd base material layer is mentioned. The resin film may have a one-layer structure, or may be a multilayer resin film having a multilayer structure of two or more layers.

(adhesive layer)

The adhesive layer may be formed of an adhesive, an adhesive, or a combination thereof, and is usually one layer, but may be two or more layers. When the adhesive layer includes two or more layers, each layer may be formed of mutually the same material or may be formed of different materials.

The adhesive may be formed by combining one or two or more of water-based adhesives, active energy ray-curable adhesives, adhesives, and the like. Examples of the water-based adhesive include polyvinyl alcohol-based resin aqueous solutions, water-based two-component polyurethane-based emulsion adhesives, and the like. The active energy ray-curable adhesive is an adhesive that is cured by irradiating active energy rays such as ultraviolet rays, and examples include adhesives containing a polymerizable compound and a photopolymerizable initiator, and adhesives containing a photoreactive resin. agent, an adhesive including a binder resin and a photoreactive crosslinking agent, etc. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable polyurethane monomers; oligomers derived from these monomers; and the like. As said photoinitiator, the photoinitiator containing the thing which generate|occur|produces active species, such as a neutral radical, anionic radical, and cationic radical, by irradiating active energy rays, such as an ultraviolet-ray, is mentioned.

Examples of binders include combinations of (meth)acrylic resins, styrene resins, silicone resins, etc. as base polymers, and crosslinking agents such as isocyanate compounds, epoxy compounds, and aziridine compounds. thing.

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-based monomer and a photocationic polymerization initiator.

Surface treatments such as corona treatment, plasma treatment, and flame treatment may be performed on the surface of the layer on which the adhesive layer is to be formed as necessary.

(Adhesive layer for optical film)

The adhesive layer for an optical film may be formed from the above-mentioned adhesive agent, pressure-sensitive adhesive, or a combination thereof, and is usually one layer, or may be two or more layers. When the adhesive layer for optical films contains two or more layers, each layer may be formed with mutually the same material, and may be formed with a different material. As an adhesive agent and a pressure-sensitive adhesive used for forming the adhesive layer for optical films, the thing similar to the adhesive agent and pressure-sensitive adhesive used for the said adhesive layer is mentioned. Surface treatment such as corona treatment, plasma treatment, flame treatment, etc. can be performed on the surface of the layer on which the adhesive layer for optical films will be formed as needed.

(Adhesive layer for laminate)

The adhesive layer for laminates may be formed of the above-mentioned adhesives, pressure-sensitive adhesives, or combinations thereof, and is usually one layer, but may be two or more layers. When the adhesive layer for laminates contains two or more layers, each layer may be formed of mutually the same material, and may be formed of different materials. As an adhesive agent and pressure-sensitive adhesive used for forming the adhesive layer for laminated bodies, the thing similar to the adhesive agent and adhesive agent used for the said adhesive layer is mentioned. Surface treatment such as corona treatment, plasma treatment, flame treatment, etc. may be performed on the surface of the layer to form the adhesive layer for laminated bodies as needed.

Claims (15)

1. A laminate comprising a1 st base material layer, a1 st functional layer, an adhesive layer, a 2 nd functional layer and a 2 nd base material layer in this order,

At least one end portion in the width direction of the laminate, the position of the end portion of the adhesive layer satisfies all of the following relationships [ a ] to [ c ]:

[a] the position of the end part of the 1 st base material layer is the same or is more inner than the position in the width direction;

[b] A position on the outer side in the width direction than a position of an end portion of the 1 st functional layer;

[c] the position of the end portion of the 2 nd functional layer is the same as or more inward in the width direction than the position.

2. The laminate according to claim 1, wherein the positions of the end portions of the adhesive layer satisfy all of the relationships [ a ] to [ c ] at both ends in the width direction of the laminate.

3. the laminate according to claim 1 or 2, wherein each of the 1 st functional layer and the 2 nd functional layer is a liquid crystal layer.

4. the laminate according to any one of claims 1 to 3, wherein at least one of the 1 st functional layer and the 2 nd functional layer is a phase difference layer.

5. A laminate comprising a1 st base material layer, a1 st functional layer, an adhesive layer and a 2 nd' functional layer in this order,

The position of the end of the adhesive layer at least one end in the width direction of the laminate satisfies all of the following relationships [ a ], [ b ], and [ d ]:

[a] The position of the end part of the 1 st base material layer is the same or is more inner than the position in the width direction;

[b] a position on the outer side in the width direction than a position of an end portion of the 1 st functional layer;

[d] The same position as the end of the 2 nd' functional layer.

6. The laminate according to claim 5, wherein the positions of the end portions of the adhesive layer satisfy all of the relationships [ a ], [ b ], and [ d ] at both ends in the width direction of the laminate.

7. The laminate according to claim 5 or 6, wherein each of the 1 st functional layer and the 2 nd' functional layer is a liquid crystal layer.

8. the laminate according to any one of claims 5 to 7, wherein at least one of the 1 st functional layer and the 2 nd' functional layer is a phase difference layer.

9. The laminate according to any one of claims 5 to 8, further comprising a resin film,

The resin film is laminated on the 2' functional layer side with a resin film adhesive layer interposed therebetween.

10. The laminate according to claim 9, wherein at least one end portion in the width direction of the laminate, a position of an end portion of the adhesive layer for resin film is the same as or inside in the width direction of the end portion of the 1 st functional layer.

11. The laminate according to claim 9 or 10, wherein the resin film is an optical film.

12. A method for producing a laminate comprising a1 st base material layer, a1 st functional layer, an adhesive layer, a 2 nd functional layer, and a 2 nd base material layer in this order, comprising:

Preparing a1 st laminated part including the 1 st base material layer and the 1 st functional layer;

Preparing a 2 nd laminated part including the 2 nd base material layer and the 2 nd functional layer; and

a step of laminating the 1 st laminated part and the 2 nd laminated part so that the 1 st functional layer and the 2 nd functional layer face each other with the adhesive layer interposed therebetween,

At least one end portion in the width direction of the laminate, the position of the end portion of the adhesive layer satisfies all of the following relationships [ a ] to [ c ]:

[a] The position of the end part of the 1 st base material layer is the same or is more inner than the position in the width direction;

[b] A position on the outer side in the width direction than a position of an end portion of the 1 st functional layer;

[c] The position of the end portion of the 2 nd functional layer is the same as or more inward in the width direction than the position.

13. A method for producing a laminate comprising a1 st base layer, a1 st functional layer, an adhesive layer and a 2 nd' functional layer in this order, comprising:

a step of preparing the laminate according to any one of claims 1 to 4; and

And a step of peeling the 2 nd base material layer from the laminate.

14. A method for manufacturing a laminate, comprising:

A step of preparing the laminate according to any one of claims 5 to 8; and

and a step of laminating the resin film on the 2' functional layer side of the laminate via an adhesive layer for resin film.

15. A method of manufacturing a laminate, comprising:

A step of preparing the laminate according to any one of claims 9 to 11; and

And a step of peeling the 1 st base material layer from the laminate.