CN110554451B

CN110554451B - Laminate and method for producing same

Info

Publication number: CN110554451B
Application number: CN201910455054.XA
Authority: CN
Inventors: 仲俊之
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2018-05-31
Filing date: 2019-05-28
Publication date: 2022-06-07
Anticipated expiration: 2039-05-28
Also published as: CN110554451A; JP2020116955A; JP2019211771A; JP6689433B2; KR20190136973A; TW202003222A; TWI808184B

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

Laminate and method for producing same

Technical Field

The present invention relates to a 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 a polarizing layer, a retardation layer, and the like are used. Patent documents 1 and 2 describe the use of a liquid crystal material as a retardation layer of an optical film used for a circularly polarizing plate or the like. JP2015-21976a1 and JP2015-22248a1 describe that a support base is peeled from a laminate in which a support base, an alignment layer, a retardation layer, an adhesive layer, a retardation layer, an alignment layer, and a support base are laminated in this order.

Disclosure of Invention

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

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 of the laminate in the width direction, the position of the end of the adhesive layer 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. (hereinafter, this laminate may be referred to as "laminate (1)").

[ 2 ] the laminate according to [ 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.

The laminate according to [ 1 ] or [ 2 ], wherein the 1 st functional layer and the 2 nd functional layer are liquid crystal layers, respectively.

[ 4 ] the laminate according to any one of [ 1 ] to [ 3 ], wherein at least one of the 1 st functional layer and the 2 nd functional layer is a retardation 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 ]:

[d] the same position as the end of the 2' functional layer described above. (hereinafter, this laminate may be referred to as "laminate (2)").

The laminate according to [ 6 ] or [ 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.

The laminate according to any one of [ 5 ] and [ 6 ], wherein the 1 st functional layer and the 2 nd' functional layer are liquid crystal layers.

The laminate according to any one of [ 5 ] to [ 7 ], wherein at least one of the 1 st functional layer and the 2 nd' functional layer is a retardation layer.

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

the resin film is laminated on the 2' functional layer side with an adhesive layer for resin film interposed therebetween. (hereinafter, this laminate may be referred to as "laminate (3)").

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

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

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, the method 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,

[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.

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, the method comprising:

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

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

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

a step of preparing the laminate according to any one of [ 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 for producing a laminate, comprising:

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

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

ADVANTAGEOUS EFFECTS OF INVENTION

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

Drawings

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

Fig. 2 (a) and (b) are schematic cross-sectional views schematically showing an example of the production process of the laminate (1).

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

Fig. 4 (a) and (b) are schematic cross-sectional views schematically showing an example of the production process of the laminate (2).

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

Fig. 6 (a) and (b) are schematic cross-sectional views schematically showing an example of a process for producing the optical laminate (3).

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

Description of symbol mark

10 1 st laminated part, 11 1 st base material layer, 12 1 st functional layer (1 st liquid crystal layer), 12 '1 st' functional layer (1 st 'liquid crystal layer), 20 nd 2 laminated part, 21 nd 2 base material layer, 22 nd 2 functional layer (2 nd liquid crystal layer), 22x adhesive layer forming region, 22y adhesive layer non-forming region, 22' 2 nd 'functional layer (2 nd' liquid crystal layer), 22 '2 nd' functional layer (2 nd 'liquid crystal layer), 30 adhesive layer, 30' adhesive layer, 36 optical film adhesive layer, 41 laminated body (1), 42 laminated body (2), 45 intermediate layer, 51 laminated body (3), 52 optical laminated body, 60 optical film (resin film).

Detailed Description

Preferred embodiments of the laminate (1), the laminate (2), and the laminate (3), and methods for producing these laminates (1) to (3), and optical laminates, are described below with reference to the drawings. The embodiments and their modifications shown below can be combined arbitrarily. In each of the embodiments and the modifications thereof, the same members as those already described in the previous embodiments and modifications thereof are denoted by the same reference numerals, and the description thereof is omitted.

Embodiment 1 (laminate (1) and method for producing same)

(laminate (1))

Fig. 1 is a schematic cross-sectional view schematically showing an example of the laminate (1). In the figure, W represents the width direction. As shown in FIG. 1, the laminate (1)41 comprises a1 st base material layer 11, a1 st functional layer 12, an adhesive layer 30, a 2 nd functional layer 22 and a 2 nd base material layer 21 in this order,

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

[a] the position of the end of the 1 st base material layer 11 is the same as or inward in the width direction of the position;

[b] the position of the end portion of the 1 st functional layer 12 is located on the outer side in the width direction;

[c] the position of the end portion of the 2 nd functional layer 22 is the same as or on the inner side in the width direction than this position.

The positions of the respective ends described in the above-mentioned requirements [ a ] to [ c ] are positions in the cross section of the laminate (1)41 in the width direction, and when the positional relationship of the ends of the respective layers is defined below, the positions are also positions in the cross section of the laminate (1)41 in the width direction.

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

The 1 st base material layer 11 has a function as a support layer for supporting the 1 st functional layer 12 formed thereon or a protective layer for protecting the 1 st functional layer 12. The 1 st base material layer and the 2 nd base material layer may be each a layer in which a plurality of films are laminated. The 1 st base material layer 11 may be a layer having a film exhibiting a polarizing function.

The 2 nd base material layer 21 has a function as a support layer for supporting the 2 nd functional layer 22 formed thereon or a protective layer for protecting the 1 st functional layer 12.

In the present embodiment, the 1 st base material layer 11 may be a film exhibiting releasability, and in the case of exhibiting releasability, it can be peeled from the 1 st functional layer 12. The 2 nd base material layer 21 may be a film exhibiting releasability, and in the case of exhibiting releasability, it can be peeled from the 2 nd functional layer 22.

The first functional layer 12 may be an optical film, a liquid crystal layer, a layer constituting a touch sensor, or the like, which exhibits optical characteristics such as polarization characteristics and optical compensation functions, and may be a resin film or a liquid crystal layer.

The 1 st functional layer 12 is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the 1 st functional layer 12 as a liquid crystal layer is sometimes referred to as a "1 st liquid crystal layer"). The 1 st liquid crystal layer may be a cured film formed by polymerizing a polymerizable liquid crystal compound, for example. The 1 st functional layer 12 is preferably a retardation layer, a touch sensor layer, a polarizing layer, and more preferably a retardation layer.

The 2 nd functional layer 22 may be a thin film layer exhibiting optical properties such as polarization properties and optical compensation functions, a layer constituting a touch sensor, a resin film, or a liquid crystal layer. The 2 nd functional layer 22 is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the 2 nd functional layer 22 as a liquid crystal layer is sometimes referred to as a "2 nd liquid crystal layer"). The 2 nd liquid crystal layer may be a cured film formed by polymerizing a polymerizable liquid crystal compound, for example, as in the 1 st liquid crystal layer. The 2 nd functional layer 22 is preferably a retardation layer, a touch sensor layer, and a polarizing layer, and more preferably a retardation layer.

The adhesive layer 30 bonds the 2 nd functional layer 22 to the 1 st base material layer 11 and the 1 st functional layer 12.

The positions of the end portions of the adhesive layer 30 at least one end portion in the width direction of the laminate (1)41 satisfy all of the relationships [ a ] to [ c ] described above.

Specifically, in the cross section in the width direction of the laminate (1)41, the end portion of the adhesive layer 30 is the same as or located inward in the width direction of the end portion of the 1 st base material layer 11, is located outward in the width direction of the end portion of the 1 st functional layer 12, and is the same as or located inward in the width direction of the end portion of the 2 nd functional layer 22.

At least one end in the width direction of the laminate (1)41 shown in fig. 1, the position of the end of the 1 st base material layer 11 is located outside the position of the end of the 1 st functional layer 12 in the width direction, and the position of the end of the 2 nd base material layer 21 is located outside the position of the end of the 2 nd functional layer 22 in the width direction. At least one end of the laminate (1)41 in the width direction, the position of the end of the 1 st base material layer 11 is the same as the position of the end of the 2 nd base material layer 21, and the position of the end of the 1 st functional layer 12 is located inward in the width direction from the position of the end of the 2 nd functional layer 22. The position of the end of the 1 st base material layer 11 and the position of the end of the 2 nd base material layer 21 may be different from each other.

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

At least one end portion in the width direction of the laminate (1)41 can be made to be in a state where the adhesive layer 30 is not bonded to the 2 nd base material layer 21 by making the position of the end portion of the adhesive layer 30 the same as or more inward in the width direction than the position of the end portion of the 2 nd functional layer 22 (the relationship of [ c ] is satisfied). Therefore, the 2 nd base material layer 21 can be peeled from the laminate (1) 41. Further, at least one end portion in the width direction of the adhesive layer 30 is made to be the same as the end portion of the 1 st base material layer 11, or is positioned on the inner side in the width direction than the end portion and is positioned on the outer side in the width direction than the end portion of the 1 st functional layer 12 (the relationship of [ a ] and [ b ] is satisfied), whereby a region including at least one end portion of the 2 nd functional layer 22 can be made to be adhered to the 1 st base material layer 11 via the adhesive layer 30. Therefore, the peeling force for separating the laminate (1)41 between the adhesive layer 30 and the 1 st base material layer 11 is larger than the peeling force for separating the laminate (1)41 between the 2 nd functional layer 22 and the 2 nd base material layer 21. When the 2 nd base material layer 21 is to be peeled from the laminate (1)41 by utilizing this difference in peeling force, separation between the adhesive layer 30 and the 1 st base material layer 11 is less likely to occur, and therefore separation between the 1 st base material layer 11 and the 1 st functional layer 12 is less likely to occur, whereas separation between the 2 nd base material layer 21 and the 2 nd functional layer 22 is more likely to occur. Therefore, the 2 nd base material layer 21 can be suitably peeled from the laminate (1) 41.

On the other hand, for example, in the case where the position of the end in the width direction of the adhesive layer 30p is the same as or inside the position of the end in the width direction of each of the 1 st functional layer 12p and the 2 nd functional layer 22p (in the case where [ b ] is not satisfied) as in the laminate 41p shown in fig. 7, when the 2 nd base material layer 21p is to be peeled, the laminate 41p may be separated between the 1 st base material layer 11p and the 1 st functional layer 12p without separating between the 2 nd base material layer 21p and the 2 nd functional layer 22p, and the 2 nd base material layer 21 may not be peeled from the laminate 41.

In the laminate (1)41, by making the positions of the end portions of the adhesive layer 30 satisfy all of the relationships [ a ] to [ c ] as described above, the 2 nd base material layer 21 is easily peeled off, and the laminate (1)41 is easily separated between the 2 nd base material layer 21 and the 2 nd functional layer 22p, so that a laminate (2)42 (fig. 3) described later is easily obtained.

The laminate (1)41 shown in fig. 1 can be set to a force required for separation between specific layers, i.e., a peeling force, in the following manner. The peeling force (i) which is a force required to separate the laminate (1)41 between the 1 st base material layer 11 and the 1 st functional layer 12 may be not less than the peeling force (ii) which is a force required to separate the laminate (1)41 between the 2 nd base material layer 21 and the 2 nd functional layer 22, or may be not more than the peeling force (ii). The peeling force (iii), which is a force required for separating the laminate (1)41 between the adhesive layer 30 and the 1 st base material layer 11, is preferably larger than the peeling forces (i) and (ii). The peeling force can be measured, for example, by using a precision universal tester AGS series (manufactured by shimadzu corporation).

(method for producing laminate (1))

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

a step of preparing a1 st stacked part 10 including a1 st base material layer 11 and a1 st functional layer 12 (fig. 2 (a));

a step of preparing a 2 nd laminated part 20 including a 2 nd base material layer 21 and a 2 nd functional layer 22 (fig. 2 (b)); and

and a step of laminating the 1 st laminated part 10 and the 2 nd laminated part 20 so that the 1 st functional layer 12 and the 2 nd functional layer 22 face each other with the adhesive layer 30 interposed therebetween (fig. 1).

As shown in fig. 2 (a), the 1 st layered part 10 may be a layered part having the 1 st functional layer 12 on the 1 st base material layer 11.

When the 1 st functional layer 12 is a resin film, the 1 st stacked part 10 may be prepared by a method of detachably bonding the 1 st base material layer 11 and the 1 st functional layer 12 using an adhesive or a pressure-sensitive adhesive.

When the 1 st functional layer 12 is the 1 st liquid crystal layer, the 1 st stacked portion 10 can be prepared by a method of applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound onto the 1 st base material layer 11, and polymerizing the polymerizable liquid crystal compound onto the 1 st base material layer 11 to form the 1 st functional layer 12.

As exemplified in JP2017-083843a1, the 1 st functional layer 12 is formed from a composition for forming a liquid crystal layer containing a dichroic dye, whereby the 1 st 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 1 st functional layer.

As shown in fig. 2 (b), the 2 nd laminate 20 may be a laminate having the 2 nd functional layer 22 on the 2 nd base material layer 21.

When the 2 nd functional layer 22 is a resin film, the 2 nd laminated part 20 can be prepared by a method of bonding the 2 nd base material layer 21 and the 2 nd functional layer 22 together in a releasable manner using an adhesive or a pressure-sensitive adhesive.

When the 2 nd functional layer 22 is the 1 st liquid crystal layer, the 1 st stacked part 10 can be prepared by a method of applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound onto the 2 nd base material layer 21 and polymerizing the polymerizable liquid crystal compound onto the 2 nd base material layer 21 to form the 2 nd functional layer 22.

As exemplified in JP2017-083843, the 2 nd functional layer can be made into a polarizing layer by forming the 2 nd functional layer 12 with a composition for forming a liquid crystal layer containing a dichroic dye.

In addition, as exemplified in korean patent No. 10-1586736, a touch sensor layer can be formed as the 2 nd functional layer.

The step of laminating the 1 st laminated part 10 and the 2 nd laminated part 20 may include the steps of: an adhesive composition layer for forming the adhesive layer 30 is formed on at least one of the 1 st functional layer 12 side of the 1 st layered part 10 and the 2 nd functional layer 22 side of the 2 nd layered part 20. The step of laminating the 1 st laminated part 10 and the 2 nd laminated part 20 may include the steps of: the 1 st laminated part 10 and the 2 nd laminated part 20 are laminated so that the 1 st functional layer 12 and the 2 nd functional layer 22 face each other with the adhesive composition layer interposed therebetween, and the adhesive layer 30 is formed from the adhesive composition layer. The step of forming the adhesive layer 30 from the adhesive composition layer may be performed as appropriate depending on the components contained in the adhesive composition layer, and for example, when the adhesive composition layer needs to be cured, the step of performing a curing treatment may be performed, and when the curing treatment is not needed, the adhesive composition layer may be directly used as the adhesive layer.

When the step of forming the adhesive composition layer on the 1 st stacked part 10 is provided, the adhesive composition layer is preferably formed such that the position of at least one end in the width direction is on the outer side in the width direction than the position of the end of the 1 st functional layer 12, and the position of the end of the 1 st base layer 11 is the same or on the inner side in the width direction than the position. When the step of forming the adhesive composition layer on the 2 nd laminate part 20 is provided, in the case of laminating the 1 st laminate part 10 and the 2 nd laminate part 20, the adhesive composition layer is preferably formed such that at least one end portion in the width direction thereof is positioned at the same position as the end portion of the 2 nd functional layer 22 or is positioned inward in the width direction from the position.

The 1 st stacked part 10 and the 2 nd stacked part 20 used in the method for producing the stacked body (1)41 may be a single film or a long film.

The laminate (1) and the method for producing the same can be modified as in the modification examples described below. The above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 1)

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

(modification 2 of embodiment 1)

The laminate (1)41 may further include other layers in addition to the 1 st base material layer 11, the 1 st functional layer 12, the adhesive layer 30, the 2 nd functional layer 22, and the 2 nd base material layer 21. For example, the laminate (1)41 may further include an adhesive layer and a release film in this order on the surface of the 1 st base material layer opposite to the 1 st functional layer.

For example, when the 1 st functional layer 12 is a1 st liquid crystal layer, a1 st alignment layer may be further provided between the 1 st base material layer 11 and the 1 st functional layer 12. When the 2 nd functional layer 22 is a 2 nd liquid crystal layer, a 2 nd alignment layer may be further provided between the 2 nd base material layer 21 and the 2 nd functional layer 22. When the 1 st functional layer 12 is a1 st liquid crystal layer and the 2 nd functional layer 22 is a 2 nd liquid crystal layer, in the method for producing the laminate (1), the 1 st laminate may have a1 st alignment layer between the 1 st base material layer 11 and the 1 st functional layer 12, and the 2 nd laminate may have a 2 nd alignment layer between the 2 nd base material layer 21 and the 2 nd functional layer 22.

When the 1 st alignment layer is provided between the 1 st base material layer 11 and the 1 st functional layer 12, at least one end portion in the width direction of the laminate (1)41, the end portion of the 1 st alignment layer may be the same as the end portion of the 1 st base material layer 11 or positioned inward in the width direction from the end portion, may be the same position as the end portion of the 1 st functional layer 12, or may be positioned inward in the width direction or outward in the width direction from the end portion.

When the 2 nd alignment layer is provided between the 2 nd base material layer 21 and the 2 nd functional layer 22, at least one end portion in the width direction of the laminate (1)41, the end portion of the 2 nd alignment layer may be the same as the end portion of the 2 nd base material layer 21 or positioned inward in the width direction than the end portion, may be the same position as the end portion of the 2 nd functional layer 22, or may be positioned inward in the width direction or outward in the width direction than the end portion.

Embodiment 2 (laminate (2) and method for producing same)

(laminate (2))

Fig. 3 is a schematic cross-sectional view schematically showing an example of the laminate (2). In the figure, W represents the width direction. As shown in FIG. 3, the laminate (2)42 comprises a1 st base material layer 11, a1 st functional layer 12, an adhesive layer 30 and a 2 nd 'functional layer 22' in this order,

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

[a] the position of the end of the 1 st base material layer 11 is the same as or on the inner side in the width direction than this position;

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

The positions of the respective ends described in the above-mentioned requirements [ a ], [ b ], and [ d ] are positions in the cross section of the laminate (2)42 in the width direction, and when the positional relationship of the ends of the respective layers is defined below, the positions are also positions in the cross section of the laminate (2)42 in the width direction.

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

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

The 2 'functional layer 22' may be an optical film, a liquid crystal layer, a layer constituting a touch sensor, or the like, which exhibits optical characteristics such as polarization characteristics and optical compensation functions, 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 is sometimes referred to as a "2 ' liquid crystal layer"). The 2 'th functional layer 22' may be, for example, a cured film formed by polymerizing a polymerizable liquid crystal compound. The 2 'th functional layer 22' may be a layer from the 2 nd functional layer 22 as described later. The 2 'th functional layer 22' is more preferably a retardation layer.

As in the previous embodiment, the 1 st base material layer 11 may be a film that can be peeled from the 1 st functional layer 12, or may be a layer having a film exhibiting a polarizing function.

The adhesive layer 30 bonds the 2 nd 'functional layer 22' to the 1 st base material layer 11 and the 1 st functional layer 12. The positions of the end portions of the adhesive layer 30 at least one end portion in the width direction of the laminate (2)42 satisfy all of the relationships [ 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 located at the same position as the end of the 1 st base material layer 11 or at the inner side in the width direction than this position, at the outer side in the width direction than the position of the end of the 1 st functional layer 12, and at the end of the 2 nd 'functional layer 22'.

At least one end in the width direction of the laminate (2)42 shown in fig. 3, the position of the end of the 1 st base material layer 11 is located outside the position of the end of the 1 st functional layer 12 in the width direction and outside the position of the end of the 2 nd 'functional layer 22' in the width direction. Further, at least one end portion in the width direction of the laminated body (2)42, the position of the end portion of the 1 st functional layer 12 is located inward in the width direction than the position of the end portion of the 2 'nd functional layer 22'.

The laminate (2)42 can be obtained by peeling the 2 nd base material layer 21 from the laminate (1)41 as described later. The laminate (2)42 can be used for producing a laminate (3) described later.

(method for producing laminate (2))

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

a step of preparing a laminate (1)41 (fig. 4 (a)); and

and a step of peeling the 2 nd base material layer 21 from the laminate (1)41 (fig. 4 (b)).

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

In the laminate (1)41, the 2 nd base material layer 21 is peelable from the 2 nd functional layer 22, and the positions of the end portions of the adhesive layer 30 at least one end portion in the width direction of the laminate (1)41 satisfy all of the relationships [ a ] to [ c ]. Therefore, the laminate (2)42 shown in fig. 3 and 4 (b) can be obtained by peeling the 2 nd base material layer 21 from the laminate (1) 41.

In the cross section in the width direction of the laminate (1)41 shown in fig. 4 (a), the 2 nd functional layer 22 has: an adhesive layer forming region 22x which is a region where the adhesive layer 30 is provided; and an adhesive layer 30-free region 22y (a portion indicated by oblique lines on the upper right in fig. 4 (a)). Since the adhesive layer forming region 22x is a region provided on the adhesive layer 30, even if the 2 nd base material layer 21 is peeled off, the adhesive layer forming region 22x is fixed to the adhesive layer 30 and is difficult to be peeled off together with the 2 nd base material layer 21. On the other hand, the adhesive layer non-formation region 22y is not fixed to the adhesive layer 30, and is therefore easily peeled together with the 2 nd base material layer 21. Therefore, when the 2 nd base material layer 21 is peeled from the laminate (1)41, as shown in fig. 4 (b), the 2 nd functional layer 22 is divided so that the adhesive layer forming region 22x exists on the adhesive layer 30 and the adhesive layer non-forming region 22y exists on the 2 nd base material layer 21, and the adhesive layer forming region 22x existing on the adhesive layer 30 becomes the 2 nd 'functional layer 22'. Therefore, the laminate (2)42 can be obtained by peeling the 2 nd base material layer 21 from the laminate (1) 41.

The laminate (1)41 used in the method for producing the laminate (2)42 may be a single sheet of film or a long film.

The laminate (2) and the method for producing the same can be modified as in the modification examples described below. The above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 2)

The position of the end of the adhesive layer 30 may be a position satisfying all of the relationships [ a ], [ b ], and [ d ] at one end in the width direction of the laminate (2)42, or may be a position satisfying all of the relationships [ a ], [ b ], and [ d ] at both ends in the width direction of the laminate (2) 42.

(modification 2 of embodiment 2)

The laminate (2)42 may further include other layers in addition to the 1 st base material layer 11, the 1 st functional layer 12, the adhesive layer 30, and the 2 nd 'functional layer 22'. The laminate (2)42 may further include an adhesive layer and a separator on the side of the 1 st base material layer 11 opposite to the 1 st functional layer 12.

When the 1 st functional layer 12 is a1 st liquid crystal layer, a1 st alignment layer may be further provided between the 1 st base material layer 11 and the 1 st functional layer 12. In the case where the 2 ' th functional layer 22 ' is a 2 ' nd liquid crystal layer, a 2 nd alignment layer may be further provided on the opposite side of the 2 ' th functional layer 22 ' from the adhesive layer 30.

When the laminate (2)42 has the 1 st alignment layer between the 1 st base material layer and the 1 st functional layer, at least one end portion in the width direction of the laminate (2)42, the end portion of the 1 st alignment layer may be the same as the end portion of the 1 st base material layer or positioned inward in the width direction than the end portion, may be the same position as the position of the width end portion of the 1 st functional layer, or may be positioned inward in the width direction or outward in the width direction than the position of the width end portion of the 1 st functional layer.

When the laminate (2)42 has the 2 nd alignment layer, the end of the 2 nd alignment layer may be located at the same position as the end of the 2 nd' functional layer or may be located inward in the width direction from this position at least at one end of the laminate (2)42 in the width direction.

In the case where the laminate (2) is obtained by peeling the 2 nd base material layer from the laminate (1), the laminate (1) may have the 1 st alignment layer and the 2 nd alignment layer. When the laminate (1) has a 2 nd alignment layer between the 2 nd substrate layer and the 2 nd functional layer, the laminate (2) can be obtained by peeling the 2 nd alignment layer together with the 2 nd substrate layer, and the 2 nd substrate layer can be peeled so that the 2 nd alignment layer is present on the 2 nd' functional layer. In this case, the 2 nd alignment layer in the laminate (1) may be divided into a region present on the 2 nd base material layer and a region present on the 2 nd' functional layer at the time of peeling the 2 nd base material layer, similarly to the 2 nd functional layer.

The peeling of the 2 nd alignment layer from the laminate (1) including the 2 nd alignment layer together with the 2 nd base material layer or the peeling of only the 2 nd base material layer can be adjusted by the peeling force between each of the 2 nd base material layer, the 2 nd alignment layer and the 2 nd functional layer. The peeling force can be adjusted by, for example, the components contained in each layer or the surface treatment applied to the surface of each layer. For example, the peeling force between the 2 nd alignment layer and the 2 nd base material layer or the 2 nd functional layer can be adjusted by the kind or amount of the additive contained in the 2 nd alignment layer or the 2 nd functional layer, or by surface treatment such as corona treatment, plasma treatment, flame treatment, or the like performed on the surface of the 2 nd alignment layer on the 2 nd base material layer side or the surface of the 2 nd alignment layer provided on the 2 nd base material layer.

Embodiment 3 (laminate (3) and method for producing same)

(laminate (3))

Fig. 5 is a schematic cross-sectional view showing an example of the laminate (3). In the figure, W represents the width direction. As shown in fig. 5, the laminate (3)51 of the present embodiment includes a laminate (2)42 (i.e., the 1 st base material layer 11, the 1 st functional layer 12, the adhesive layer 30, and the 2 nd 'functional layer 22') and an optical film 60 (resin film),

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

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

As shown in fig. 5, the laminate (3)51 includes a1 st base material layer 11, a1 st functional layer 12, an adhesive layer 30, a 2 nd 'functional layer 22', an adhesive layer 36 for an optical film, and an optical film 60 in this order. As described in the previous embodiment, the laminate (2)42 includes the 1 st base material layer 11, the 1 st functional layer 12, the adhesive layer 30, and the 2 nd 'functional layer 22' in this order.

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 end portions in the width direction of the laminate (3)51, the end portion of the optical film 60 may be at the same position as the end portion of the 2 nd 'functional layer 22' or the end portion of the adhesive layer 30, may be at the same position as the end portion of the 1 st functional layer, may be at the same position as the end portion of the 1 st base material layer 11, or may be different from both of these positions.

The position of each end of each layer constituting the laminate (3)51 is a position in the cross section of the laminate (3)51 in the width direction.

The optical film 60 is bonded to the 2 'nd functional layer 22' with an adhesive layer 36 for optical films. The end of the optical film adhesive layer 36 may be the same as or located inward in the width direction of the 1 st base material layer 11 at least one end in the width direction of the laminate (3)51 shown in fig. 5. In particular, it is preferable that the end portion of the optical film adhesive layer 36 is the same as or located inward in the width direction of the end portion of the optical film 60 and the end portion of the outermost layer in the width direction of the laminate (2)42 is the same as or located inward in the width direction of the end portion, so that the optical film adhesive layer 36 can be prevented from bleeding out of the laminate (3) and contaminating the transportation path, and the like.

The end of the optical film adhesive layer 36 is the same as or located inward in the width direction of the end of the 1 st functional layer 12 in at least one of the ends in the width direction of the laminate (3)51 shown in fig. 5.

The laminate (3)51 may be used to obtain an optical laminate 52 (fig. 6 (b)) as described below. For example, the optical laminate 52 can be obtained by peeling the 1 st base material layer 11 from the laminate (3) 51.

As will be described in detail later, the intermediate layer 45 (the layer including the 2 nd 'functional layer 22', the adhesive layer 30, and the 1 st functional layer 12) between the 1 st base material layer 11 and the optical film adhesive layer 36 is divided into a region located on the outer side in the width direction than the end portion of the optical film adhesive layer 36 (hereinafter, may be referred to as "outer region") and a region located on the inner side in the width direction (hereinafter, may be referred to as "inner region") by peeling the 1 st base material layer 11 (fig. 6 (a) and (b)).

As described above, in the laminate (3)51, when the position of the end of the adhesive layer 36 for an optical film is the same as or inside in the width direction of the end of the 1 st functional layer 12, the outer region of the intermediate layer 45 divided by the peeling of the 1 st base layer 11 has a region in which the adhesive layer 30 is adhered to the 1 st base layer 11, and the inner region is a region in which the 1 st functional layer 12 or a part thereof is present on the 1 st base layer 11 (fig. 6 (a), (b)).

As described in the above embodiments, since the 1 st base material layer 11 can be peeled off from the 1 st functional layer 12, the separation between the 1 st base material layer 11 and the adhesive layer 30 is not easily generated in the outer region, and the separation between the 1 st base material layer 11 and the 1 st functional layer 12 is easily generated in the inner region. Therefore, when the 1 st base material layer 11 is peeled from the laminate (3)51, the intermediate layer 45 is divided so that the 1 st base material layer 11 has an outer region and the optical film adhesive layer 36 has an inner region, and the 1 st base material layer and the 1 st functional layer can be separated from each other in the inner region. Therefore, the optical laminate 52 can be obtained by peeling the 1 st base material layer 11 from the laminate (3)51 ((b) of fig. 6).

(method for producing laminate (3))

The method for producing the laminate (3)51 (fig. 5) includes:

a step of preparing a laminate (2)42 (fig. 3 or fig. 4 (b)); and

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

The laminate (2) can be prepared by the manufacturing method described in the previous embodiment as shown in fig. 3 or fig. 4 (b). The laminate (2)42 is as described in the previous embodiment. The optical film 60 and the optical film adhesive layer 36 are as described above.

The optical film 60 can be laminated by, for example, forming an adhesive composition layer for optical film for forming the adhesive layer 36 for optical film on at least one of the 2 'functional layer 22' side of the laminate (2)42 and the optical film 60, and bonding the optical film 60 and the 2 'functional layer 22'. The method for forming the adhesive layer 36 for an optical film from the adhesive composition layer for an optical film may be performed as appropriate depending on the components contained in the adhesive composition layer for an optical film, and for example, when the adhesive composition layer for an optical film needs to be cured, the step of performing a curing treatment may be performed, and when the curing treatment is not required, the adhesive composition layer for an optical film may be directly used as the adhesive layer for an optical film.

In the laminate (3)51 shown in fig. 5, when the position of the end of the adhesive layer 36 for an optical film is the same as or inward in the width direction of the end of the 1 st functional layer 12, it is preferable that the position of the end of the adhesive composition layer for an optical film is the same as or inward in the width direction of the end of the 1 st functional layer 12. For example, when the step of forming the adhesive composition layer for optical film on the 2 nd 'functional layer 22' side of the laminate (2)42 is provided, the adhesive composition layer for optical film may be formed so that the position of the end portion of the adhesive composition layer for optical film is the same as or inside in the width direction of the 1 st functional layer 12. In the case where the step of forming the adhesive composition layer for an optical film on the optical film 60 is provided, when the optical film 60 and the laminate (2)42 are laminated with the adhesive composition layer for an optical film interposed therebetween, the adhesive composition layer for an optical film is preferably formed so that the position of the end in the width direction of the adhesive composition layer for an optical film is the same as or inside in the width direction of the end in the width direction of the 1 st functional layer 12.

The laminate (2)42 used in the method for producing the laminate (3)51 may be a single film or a long film. The optical film may be a single film or a long film.

The laminate (3) and the method for producing the same can be modified as in the modification examples described below. The above-described embodiments and the modifications described below may be combined as desired.

The laminate (3) may further have a layer on the side of the optical film 60 opposite to the optical film adhesive composition layer, and for example, may have an adhesive layer and a release film in this order on the side of the optical film 60 opposite to the optical film adhesive composition layer.

(modification 1 of embodiment 3)

At least one end in the width direction of the laminate (3)51 may be located at a position outside the position of the end in the width direction of the adhesive layer for an optical film in the width direction of the 1 st functional layer. In this case, even if the 1 st base material layer is peeled from the laminate (3)51, the region in which the adhesive layer is bonded to the 1 st base material layer is included in the region inside the intermediate layer 45 (the region inside the position of the end portion of the adhesive layer for an optical film in the cross section of the laminate (3)51 in the width direction), and therefore separation between the 1 st base material layer and the 1 st functional layer is less likely to occur. When the position of the end in the width direction of the adhesive layer for an optical film is located on the outer side in the width direction than the position of the end in the width direction of the 1 st functional layer, the 1 st 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 end in the width direction of the 1 st functional layer 12 or at the position on the inner side in the width direction than the position.

(modification 2 of embodiment 3)

In the laminate (3)51, for example, a release film (resin film) may be used instead of the optical film, an adhesive layer for laminate (adhesive layer for resin film) may be used instead of the adhesive layer 36 for optical film, or an optical film such as a polarizing plate may be used instead of the 1 st 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 off a release film at an appropriate timing.

(modification 3 of embodiment 3)

In the laminate (3)51, when the 1 st functional layer 12 is a1 st liquid crystal layer and the 2 nd 'functional layer 22' is a 2 nd liquid crystal layer, for example, a1 st alignment layer may be further provided between the 1 st base material layer 11 and the 1 st functional layer, and a 2 nd alignment layer may be further provided between the 2 nd 'functional layer 22' and the optical film adhesive layer 36.

When the laminate (3)51 has the 1 st alignment layer, the end of the 1 st alignment layer may be the same as the end of the 1 st base material layer or located inward in the width direction of the laminate (3) than the end, or may be the same as the end of the 1 st functional layer, or located inward in the width direction or outward in the width direction than the end. When the laminate (3)51 has the 2 nd alignment layer, the position of the end of the 2 nd alignment layer may be the same as the position of the end of the 2 nd 'functional layer 22', or may be located inward in the width direction from this position.

When the laminate (3) has the 2 nd alignment layer, the laminate (2) having the 2 nd alignment layer and the optical film may be prepared, and the optical film may be laminated on the 2 nd alignment layer side of the laminate (2) with the adhesive layer 36 for an optical film interposed therebetween.

Embodiment 4 (method for producing optical laminate)

Fig. 6 is a schematic cross-sectional view schematically showing an example of a process for producing an optical laminate. In the figure, W represents the width direction.

The laminate (3)51 shown in fig. 6 (a) has the same structure as the laminate (3)51 shown in fig. 5. The method for manufacturing the optical laminate 52 includes:

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

and a step of peeling the 1 st base material layer 11 from the laminate (3)51 (fig. 6 (b)).

As shown in fig. 6 (b), the optical laminate 52 includes the 1 st ' functional layer 12 ', the adhesive layer 30 ', the 2 nd "functional layer 22", the optical film adhesive layer 36, and the optical film 60 in this order. As described in the previous embodiments, the laminate (3)51 includes the 1 st functional layer 12, the adhesive layer 30, the 2 nd 'functional layer 22', the optical film adhesive layer 36, and the optical film 60 in this order.

At least one end in the width direction of the optical layered body 52, for example, as shown in fig. 6 (b), the 1 st ' functional layer 12 ', the adhesive layer 30 ', the 2 nd ' functional layer 22 ', and the optical film adhesive layer 36 have the same position at the end. In the optical laminate 52 shown in fig. 6 (b), the position of the end of the optical film 60 is shown to be located on the outer side in the width direction than the position of the end of the optical film adhesive layer 36, and may be located on the inner side in the width direction, or may be located at the same position as the end of the optical film adhesive layer 36.

The position of each end of each layer constituting the optical layered body 52 is a position in the cross section of the optical layered body 52 in the width direction.

The 1 st ' functional layer 12 ', the adhesive layer 30 ', and the 2 nd ' functional layer 22 ' included in the optical laminate 52 are layers derived from the 1 st functional layer 12, the adhesive layer 30, and the 2 nd ' functional layer 22 ' included in the laminate (3)51, respectively.

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

As described in the above embodiments, at least one end portion in the width direction of the laminate (3)51 has an end portion of the optical film adhesive layer 36 that is the same as or located inward in the width direction of the end portion of the 1 st functional layer 12.

In the laminate (3)51 shown in fig. 6 (a), the 1 st base material layer 11 can be peeled off from the 1 st functional layer 12, but the position of the end of the adhesive layer 30 is located outside the position of the end of the 1 st functional layer 12 in the width direction. Therefore, in the laminate (3)51 shown in fig. 6 (a), the 1 st base material layer 11 and the adhesive layer 30 are less likely to be separated in the region where the adhesive layer 30 is present outside the end portion of the 1 st functional layer 12, but the 1 st base material layer 11 and the 1 st functional layer 12 are more likely to be separated inside the end portion of the 1 st functional layer.

As described above, in the laminate (3)51 shown in fig. 6 (a), the position of the end of the optical film adhesive layer 36 is the same as or inside in the width direction of the end of the 1 st functional layer 12. Therefore, when the 1 st base material layer 11 is to be peeled from the laminate (3)51, as shown in fig. 6 (a) and (b), the 2 nd 'functional layer 22' is divided between a region where the optical film adhesive layer 36 is provided and a region where the optical film adhesive layer 36 is not provided, and the adhesive layer 30 on the 1 st base material layer 11 side of the 2 nd 'functional layer 22' is also divided into a portion located outside and a portion located inside the position of the end portion of the optical film adhesive layer 36 in the cross section in the width direction of the laminate (3) 51. When the position of the end of the 1 st functional layer 12 is located on the inner side in the width direction than the position of the end of the optical film adhesive layer 36 in the cross section in the width direction of the laminate (3)51, the 1 st functional layer 12 is divided into a portion located on the outer side and a portion located on the inner side than the position of the end of the optical film adhesive layer 36, and when the position of the end of the 1 st functional layer 12 is located on the same position as the position of the end of the optical film adhesive layer 36 in the cross section in the width direction of the laminate (3)51, the 1 st functional layer 12 is divided by the boundary portion between the 1 st functional layer 12 and the adhesive layer 30 in the width direction.

As described above, when the 1 st base material layer 11 is peeled from the laminate (3)51 shown in fig. 6 (a), the intermediate layer 45 including the 2 nd 'functional layer 22', the adhesive layer 30, and the 1 st functional layer 12 between the 1 st base material layer 11 and the optical film adhesive layer 36 is divided into an outer region (a portion indicated by a lower right oblique line in fig. 6 (a) and (b)) located on the outer side in the width direction than the end portion of the optical film adhesive layer 36 and an inner region located on the inner side in the width direction. The outer region has a region in which the adhesive layer 30 is bonded to the 1 st base material layer 11, and the inner region is a region in which the 1 st functional layer 12 or a part thereof is present on the 1 st base material layer 11, and therefore, the separation between the 1 st base material layer 11 and the adhesive layer 30 is not likely to occur in the outer region, but the 1 st base material layer 11 can be peeled from the 1 st functional layer 12 in the inner region, and therefore, the separation between the 1 st base material layer 11 and the 1 st functional layer 12 is likely to occur. Therefore, when the 1 st base material layer 11 is peeled from the laminate (3)51, as shown in fig. 6 (b), the intermediate layer 45 is divided so that the outer region exists on the 1 st base material layer 11 and the inner region exists on the optical film adhesive layer 36, and the 1 st base material layer and the 1 st functional layer can be separated in the inner region. As a result, the optical layered body 52 having the same position of the end portions of the 1 st ' functional layer 12 ', the adhesive layer 30 ', the 2 nd "functional layer 22", and the optical film adhesive layer 36 can be obtained.

The method for producing the optical laminate 52 may further include a step of providing an adhesive layer for a laminate on the opposite side of the 1 st ' functional layer 12 ' of the optical laminate 52 from the adhesive layer 30 '. In order to bond the optical laminate to the optical display element, an adhesive layer for laminate may be used.

The laminate (3)51 used in the method for producing the optical laminate 52 may be a single film or a long film.

In the optical laminate 52, the optical laminate 52 can be made into a circularly polarizing plate by using the optical film 60 as a linearly polarizing plate, the 2 nd "functional layer 22" as an 1/2 wave plate, and the 1 st "functional layer 12" as an 1/4 wave plate. The optical laminate 52 can also be made into a circularly polarizing plate by using the optical film 60 as a linearly polarizing plate, the 2 nd "functional layer 22" as an 1/4 wave plate having reverse wavelength dispersion, and the 1 st "functional layer 12" as a positive C plate.

The optical laminate 52 and the method for manufacturing the same can be modified as in the modification examples described below. The above-described embodiments and the modifications described below may be combined as desired.

(modification 1 of embodiment 4)

The optical laminate 52 may further include other layers in addition to the 1 st ' functional layer 12 ', the adhesive layer 30 ', the 2 nd "functional layer 22", the optical film adhesive layer 36, and the optical film 60. When the 1 st ' functional layer 12 is a1 st ' liquid crystal layer and the 2 nd "functional layer 22" is a 2 nd "liquid crystal layer, the optical laminate 52 may have, for example, a1 st alignment layer on the opposite side of the 1 st ' functional layer 12 ' from the adhesive layer 30 ', or a 2 nd alignment layer between the 2 nd" functional layer 22 "and the optical film adhesive layer 36.

In the case where the optical layered body has the 1 st alignment layer, the end of the 1 st alignment layer may be located at the same position as the end of the 1 st 'functional layer 12' or may be located inward in the width direction from this position at least one end in the width direction of the optical layered body. When the optical laminate has the 1 st alignment layer, the laminate (3) used for producing the optical laminate has the 1 st alignment layer.

When the laminate (3) has the 1 st alignment layer between the 1 st base material layer and the 1 st functional layer, the 1 st alignment layer may be peeled off together with the 1 st base material layer to obtain the optical laminate 52 shown in fig. 6 (b), or the 1 st base material layer may be peeled off so that the 1 st alignment layer is present on the 1 st 'functional layer 12'. In this case, the 1 st alignment layer in the laminate (3) may be divided into a region on the outer side in the width direction and a region on the inner side in the width direction with respect to the end in the width direction of the optical film adhesive layer 36, in the same manner as the intermediate layer 45, at the time of peeling the 1 st base material layer.

In the case where the optical laminate has the 2 nd alignment layer, at least one end portion in the width direction of the optical laminate may be at the same position as the end portion of the 2 nd "functional layer 12", or may be at a position inward in the width direction from this position. When the optical laminate has the 2 nd alignment layer, the laminate (3) used for producing the optical laminate has the 2 nd alignment layer.

(modification 2 of embodiment 4)

In the method for producing the optical laminate 52, a release film and an adhesive layer for a laminate are used instead of the optical film and the adhesive layer for an optical film, whereby a laminate including a release film can be produced. The method for producing an optical laminate may include a step of providing an optical film on the side of the 2' th functional layer opposite to the adhesive layer with the adhesive layer for an optical film interposed therebetween.

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

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

The 1 st base material layer and the 2 nd base material layer (hereinafter, both may be collectively referred to as "base material layers") are preferably films made of resin materials. As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like is used. Specifically, there may be mentioned: polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; a polystyrene-based resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide-based resin; a polyether ketone resin; polyphenylene sulfide-based resin; a polyphenylene ether resin; and mixtures, copolymers, and the like thereof. Among these resins, any of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth) acrylic resins, or a mixture thereof is preferably used. The "(meth) acrylic acid" means "at least 1 kind of acrylic acid and methacrylic acid".

The base layer may be a film exhibiting releasability, or may be a layer of a film having a polarizing function. The base material layer may be a resin film suitable as a bendable front panel.

< front Panel >

The front panel is a panel that plays a role of suppressing warpage of an image display element such as a liquid crystal cell or protecting the image display element, and is, for example, a light-transmitting (preferably optically transparent) plate-like body. The front panel may have a single-layer structure or a multi-layer structure.

The front panel is disposed on the outermost surface of the final product including the polarizing plate of the present invention, and therefore, 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, or a polymer film having a young's modulus of 2GPa or more. The film is preferably an inorganic material such as glass or reinforced glass, and particularly preferably a resin film for flexible display applications, and among them, a polyamide film, a polyamideimide film, a polyimide film, a polyester film, an olefin film, an acrylic film, and a cellulose film are preferable. It is also preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles, and the like in the polymer film.

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

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

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

(1 st alignment layer and 2 nd alignment layer)

The 1 st alignment layer and the 2 nd alignment layer (hereinafter, both may be collectively referred to as "alignment layers") that the laminates (1) to (3) and the optical laminate may include have an alignment controlling force for aligning the polymerizable liquid crystal compound contained in the liquid crystal layer formed thereon in a desired direction. Examples of the alignment layer include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove alignment layer having a concave-convex pattern or a plurality of grooves (grooves) on the surface of the layer. The thickness of the alignment layer is usually 10 to 500nm, preferably 10 to 200 nm.

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

The photo-alignment polymer layer may be formed by applying a composition including a polymer or monomer having a photoreactive group and a solvent to a base material layer and irradiating polarized light. In this case, the orientation controlling force of the photo-alignment polymer layer can be arbitrarily adjusted by using the polarized light irradiation condition of the photo-alignment polymer.

The trench alignment layer may be formed using, for example, the following method: a method of forming a concave-convex pattern by performing exposure, development, and the like on 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-shaped master having grooves on the surface thereof, and then transferring the layer to a base material layer and curing the layer; and a method of forming an uncured layer of an active energy ray-curable resin on the base layer, and curing the layer by pressing a roll-shaped master having irregularities against the layer to form irregularities.

(functional layer 1 and functional layer 2)

Examples of the 1 st functional layer and the 2 nd functional layer (hereinafter, both may be collectively referred to as "functional layers") include an optical film exhibiting optical characteristics such as polarization characteristics and optical compensation functions, a liquid crystal layer, and a layer constituting a touch sensor.

The optical film in the functional layer may be an optical film described later. The resin film is preferably a retardation film, a polarizing layer, or a layer constituting a touch sensor, and more preferably a retardation film.

The thickness of the resin film is usually 5 μm or more and 100 μm or less.

(optical film)

The optical film may be a polarizing layer, a polarizing plate having a protective layer formed on at least one side of the polarizing layer, a polarizing plate with a protective film having a protective film laminated on at least one side of the polarizing plate, a reflective film, a semi-transmissive reflective film, a brightness enhancement film, an optical compensation film, a film with an anti-glare function, a retardation film, or the like, and may have 1 kind of optical film among them, or may have a multilayer structure of 2 or more kinds. In addition, the optical film may include a liquid crystal layer, which may be a phase difference layer. In the present specification, the "polarizing layer" refers to a layer having a property of transmitting, when unpolarized light is incident, linearly polarized light having a vibration plane orthogonal to the absorption axis.

The polarizing layer that may be included in the optical film may be a polarizing layer in which a dichroic dye is adsorbed and aligned on a single polyvinyl alcohol resin film, or may be a laminate film in which two or more layers of polyvinyl alcohol resin layers in which a dichroic dye is adsorbed and aligned are provided on a base film. 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 be a liquid crystal layer.

The liquid crystal layer that may be included in the optical film may be a liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound. The liquid crystal layer can be formed by applying a liquid crystal layer-forming composition containing a polymerizable liquid crystal compound onto a base layer or an alignment layer provided on the base layer, drying the composition, and then polymerizing and curing the polymerizable liquid crystal compound by irradiation with active energy rays such as ultraviolet rays.

< retardation film >

The retardation film is a film that imparts a retardation in a direction (in-plane direction of the film) orthogonal to the traveling direction of incident light. The 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 thickness of the stretched retardation film may be 200 μm or less, and preferably 1 μm to 100 μm. If the thickness exceeds 200 μm, flexibility may be reduced.

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

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 may be a linear polarizing plate or a circular polarizing plate.

[ Linear polarizing plate ]

The linear polarizer may be a film-type polarizer produced by dyeing and stretching a polyvinyl alcohol (PVA) film. The polarizing film exhibits polarization performance by adsorbing a dichroic dye such as iodine to the PVA film after being oriented by stretching, or by stretching the PVA film in a state of being adsorbed to the dichroic dye. The production of the film-type polarizing plate may include steps such as swelling, crosslinking with boric acid, washing with an aqueous solution, and drying. The stretching and dyeing process 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 film to be used is preferably 10 to 100 μm, and the stretch ratio is preferably 2 to 10 times.

The film-type polarizing plate may have a protective film described later on at least one surface thereof. When the substrate is laminated with another substrate and stretched, the substrate may be peeled off after the protective film is attached to the surface of the polarizing plate, or the substrate may be used as the protective film as it is when stretched.

Further, another example of the polarizing plate may be a liquid crystal coating type polarizing plate formed by coating a liquid crystal polarizing composition. The liquid crystal polarizing composition may include a liquid crystal compound and a dichroic dye compound. The liquid crystal polarizing layer may be produced by applying a liquid crystal polarizing composition to an alignment film to form a liquid crystal polarizing layer. The thickness of the liquid crystal polarizing layer may be formed thinner than the film-type polarizing plate. The thickness of the liquid crystal polarizing layer may be 0.5 to 10 μm, preferably 1 to 5 μm.

The alignment film can be produced by, for example, applying an alignment film-forming composition to a base material and imparting alignment properties by rubbing, polarized light irradiation, or the like. The liquid crystal polarizing layer may be peeled off from the substrate and transferred to be laminated, or the substrate may be directly laminated. As the substrate, a polymer film exemplified as a protective film described later can be used.

As the protective film, any transparent polymer film may be used, and materials and additives used for the transparent base material may be used. Cellulose-based films, olefin-based films, acrylic films, and polyester films are preferable. The protective film may be a coating type protective film obtained by coating and curing a cationic curing composition such as an epoxy resin or a radical curing composition such as an acrylate. If necessary, a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent brightener, a dispersant, a heat stabilizer, a light stabilizer, an antistatic agent, an antioxidant, a lubricant, a solvent, or the like may be included. The thickness of the protective film may be 200 μm or less, and preferably 1 μm to 100 μm. If the thickness exceeds 200 μm, flexibility may be reduced.

[ circularly polarizing plate ]

The circularly polarizing plate is a functional layer having a function of transmitting only a right circularly polarized light component or a left circularly polarized light component by laminating a λ/4 phase difference plate on a linearly polarizing plate. For example, it is used for the following purposes: the external light that has been converted into right circularly polarized light and reflected by the organic EL panel to become left circularly polarized light is blocked, and only the light-emitting component of the organic EL is transmitted, whereby the influence of reflected light is suppressed and an image is easily viewed. In order to achieve the circular polarization function, the absorption axis of the linear polarization plate and the slow axis of the λ/4 phase difference plate need to be 45 ° in theory, but are 45 ± 10 ° in practical use. The linearly polarizing plate and the λ/4 retardation plate do not necessarily need to be stacked adjacent to each other, and the relationship between the absorption axis and the slow axis may be set to satisfy the above range. It is preferable to realize complete circular polarization in all wavelengths, but it is not necessary in practice, and therefore, the circular polarizing plate in the present invention further includes an elliptical polarizing plate. It is also preferable that: a lambda/4 phase difference film is further laminated on the observation side of the linear polarizing plate, and the observation performance in the state of wearing the polarized sunglasses is improved by making the emitted light into circularly polarized light. In general, the material of the retardation film is a material which exhibits a larger birefringence as the wavelength is shorter and a smaller birefringence as the wavelength is longer. In this case, since it is not possible to realize a retardation of λ/4 in all visible light regions, it is often designed so that an in-plane retardation of λ/4 in the vicinity of 560nm, which is high in visibility, is 100 to 180nm, preferably 130 to 150 nm. The use of a reverse dispersion λ/4 phase difference plate using a material having a birefringence wavelength dispersion characteristic opposite to that of the conventional one is preferable because it can improve the visibility. As such a material, a material described in japanese patent application laid-open No. 2007-232873 and the like is preferably used in the case of a stretched phase difference plate, and a material described in japanese patent application laid-open No. 2010-30979 is preferably used in the case of a liquid crystal coated phase difference plate.

As another method, a technique is known in which a wide-band λ/4 phase difference plate is obtained by combining a λ/2 phase difference plate (japanese patent application laid-open No. h 10-90521). The λ/2 phase difference plate is also manufactured by the same material method as the λ/4 phase difference plate. The combination of the stretching type retardation plate and the liquid crystal coating type retardation plate is arbitrary, and when the liquid crystal coating type retardation plate is used for both, the film thickness can be reduced, which is preferable.

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

[ contact sensor ]

Touch sensors are used as input means. As the touch sensor, various types have been proposed, such as a resistive film type, a surface acoustic wave type, an infrared ray type, an electromagnetic induction type, and a capacitance type. Among them, the capacitance system is preferred. The capacitance touch sensor is divided into an active region and an inactive region located in an outer region of the active region. The active region is a region corresponding to a region (display portion) on which a screen is displayed on the display panel, and is a region in which a user's touch is sensed, and the inactive region is a region corresponding to a region (non-display portion) on which a screen is not displayed on the display device. The touch sensor may include: a substrate having a flexible characteristic; a sensing pattern formed on an active region of the substrate; and sensor lines formed in the inactive region of the substrate and connected to an external drive circuit via the sensor pattern and the flange. As the substrate having a flexible property, the same material as the polymer film substrate of the front plate can be used. Further, since the base material can be peeled off, only the touch sensor portion can be transferred to the laminate 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 a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. When a polymerizable liquid crystal compound is used, a liquid crystal layer as a liquid crystal cured layer can be formed by applying a composition for forming a liquid crystal layer, which contains the polymerizable liquid crystal compound, a solvent, and, if necessary, various additives, onto an alignment layer to form a coating film, and curing the coating film. Alternatively, the liquid crystal layer may be formed by applying the composition for forming a liquid crystal layer on the base layer to form a coating film and stretching the coating film together with the base layer. The liquid crystal layer may be a phase difference layer.

The composition for forming a liquid crystal layer may contain a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, and the like in addition to the polymerizable liquid crystal compound and the solvent. Known materials can be used as appropriate for the polymerizable liquid crystal compound, the solvent, the polymerization initiator, the reactive additive, the leveling agent, the polymerization inhibitor, and the like.

The thickness of the liquid crystal layer is usually 0.1 μm or more and 10 μm or less.

(Release film)

The release film functions as a spacer that supports the adhesive layer and can be peeled from the adhesive layer. Examples of the release film include a film obtained by subjecting the surface of the base film on the side supporting the pressure-sensitive adhesive layer to a mold release treatment such as a silicone treatment. The resin material constituting the base film may be the same resin material as the resin material constituting 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 of an adhesive, a pressure-sensitive adhesive, or a combination thereof, and may be generally 1 layer or 2 or more layers. When the adhesive layer includes 2 or more layers, the layers may be formed of the same material or different materials.

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

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

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

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

(adhesive layer for optical film)

The adhesive layer for an optical film may be formed of the above-mentioned adhesive, pressure-sensitive adhesive and combination thereof, and may be usually 1 layer or 2 or more layers. When the adhesive layer for an optical film includes 2 or more layers, the layers may be formed of the same material or different materials. As the adhesive and the pressure-sensitive adhesive used for forming the adhesive layer for an optical film, the same adhesives and pressure-sensitive adhesives as those used for the above adhesive layer can be mentioned. The surface of the layer on which the adhesive layer for an optical film is to be formed may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, or the like as necessary.

(adhesive layer for laminate)

The adhesive layer for a laminate may be formed of the above-described adhesive, pressure-sensitive adhesive, or a combination thereof, and may be generally 1 layer or 2 or more layers. When the adhesive layer for a laminate includes 2 or more layers, the layers may be formed of the same material or different materials. Examples of the adhesive and the binder used for forming the adhesive layer for a laminate include the same adhesives and binders as those used for the adhesive layer. The surface of the layer to be formed with the adhesive layer for a laminate may be subjected to surface treatment such as corona treatment, plasma treatment, flame treatment, or the like as necessary.

Claims

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,

the 1 st functional layer and the 2 nd functional layer are liquid crystal layers respectively.

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 at least one of the 1 st functional layer and the 2 nd functional layer is a phase difference layer.

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

[d] the same position as the end of the 2' functional layer,

5. The laminate according to claim 4, 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.

6. The laminate according to claim 4 or 5, wherein at least one of the 1 st functional layer and the 2 nd' functional layer is a phase difference layer.

7. The laminate according to claim 4 or 5, further comprising a resin film,

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

8. The laminate according to claim 7, 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 first functional layer 1.

9. The laminate according to claim 7, wherein the resin film is an optical film.

10. 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:

11. 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 3; and

a step of forming the 2 nd' functional layer by peeling the 2 nd base material layer from the laminate,

12. A method for manufacturing a laminate, comprising:

a step of preparing the laminate according to any one of claims 4 to 6; and

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

13. A method of manufacturing a laminate, comprising:

a step of preparing the laminate according to any one of claims 7 to 9; and

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