TWI808184B - Laminated article and method for producing the same - Google Patents

Abstract

Provided is a laminated article containing a first matrix layer, a first functional layer, an adhesive layer, a second functional layer and a second matrix layer in this order, In at least one end in the width direction of the laminated article, the position of an end of the adhesive layer satisfies all of the following relationships [a] to [c]: [a] the same as the position of an end of the first matrix layer, or at the inner side in the width direction of the position of an end of the first matrix layer, [b] at the outer side in the width direction of the position of an end of the first functional layer, and [c] the same as the position of an end of the second function layer, or at the inner side in the width direction of the position of an end of the second function layer.

Description

Laminated body and manufacturing method thereof

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

Members including polarizing layers, retardation layers, and the like are used in display devices such as organic EL display devices and liquid crystal display devices. Patent Documents 1 and 2 describe using a liquid crystal material as a retardation layer of an optical film used in a circular polarizing plate or the like. Patent Documents 1 and 2 describe that a support substrate is peeled off from a laminate in which a support substrate, an alignment layer, a retardation layer, an adhesive layer, a retardation layer, an alignment layer, and a support substrate are sequentially laminated.

[Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2015-21976.

Patent Document 2: Japanese Patent Laid-Open No. 2015-22248.

The object of the present invention is to provide a laminate suitable as an optical product material and a method for producing the same.

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

[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 sequence, wherein, in 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 from [a] to [c], [a] is at the same position as the end of the first base material layer, or is located on the inner side in the width direction of the end of the first base material layer; [b] is located at the end of the first functional layer. The position of the portion is closer to the outside in the width direction; and [c] is the same as the position of the end of the second functional layer, or located on the inner side of the width direction than the end of the second functional layer.

(This laminate will be referred to as "laminate (1)" hereinafter.)

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

[3] The laminate described in [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 second functional layer in sequence, and in 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], [b], and [d], [a] being the same as the position of the end of the first base material layer, or located on the inner side in the width direction of the end of the first base material layer; [b] located at a position relative to the end of the first functional layer On the outer side in the width direction; and [d] is the same as the position at the end of the aforementioned 2' functional layer.

(This laminate will be referred to as "laminate (2)" hereinafter.)

[6] The laminate described in [5], wherein the position of the end of the adhesive layer satisfies all of the relationships in [a], [b], and [d] above at both ends in the width direction of the laminate.

[7] The laminate described in [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, and the resin film is laminated on the side of the 2′ functional layer via an adhesive layer for the resin film.

(This laminate will be referred to as "laminate (3)" hereinafter.)

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

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

[12] A method for manufacturing a laminate, wherein the above-mentioned laminate system sequentially includes a first substrate layer, a first functional layer, an adhesive layer, a second functional layer, and a second substrate laminate. The method for manufacturing the above-mentioned laminate includes the following steps: a step of preparing a first build-up part, the first build-up part containing the first base material layer and the first functional layer; a step of preparing a second build-up part, the second build-up part containing the second base material layer and the second functional layer; The step of laminating the first laminated part and the second laminated part so that the first functional layer and the second functional layer face each other; in 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 from [a] to [c]: outside in the width direction; and [c] at the same position as the end of the second functional layer, or at a position inside in the width direction relative to the end of the second functional layer.

[13] A method for producing a laminate, wherein the above-mentioned laminate system sequentially includes a first substrate layer, a first functional layer, an adhesive layer, and a second functional layer, and the method for producing the above-mentioned laminate comprises the following steps: a step of preparing the laminate as described in any one of [1] to [4]; and a step of peeling off the second substrate layer from the above-mentioned laminate.

[14] A method for producing a laminate comprising the following steps: a step of preparing the laminate described in any one of [5] to [8]; and a step of laminating the resin film on the side of the 2' functional layer of the laminate via a resin film using an adhesive layer.

[15] A method for producing a laminate comprising the steps of: preparing the laminate described in any one of [9] to [11]; and peeling off the first substrate layer from the laminate.

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

10‧‧‧1st Lamination Department

11‧‧‧The first substrate layer

12‧‧‧The first functional layer (the first liquid crystal layer)

12'‧‧‧1st' functional layer (1st' liquid crystal layer)

20‧‧‧The second layering department

21‧‧‧The second substrate layer

22‧‧‧The second functional layer (the second liquid crystal layer)

22x‧‧‧adhesion layer formation area

22y‧‧‧adhesion layer not formed area

22'‧‧‧2' functional layer (2' liquid crystal layer)

22"‧‧‧2nd" functional layer (2nd" liquid crystal layer)

30, 30'‧‧‧adhesion layer

36‧‧‧Adhesive layer for optical film

41‧‧‧Laminated body(1)

42‧‧‧Laminates(2)

45‧‧‧intermediate layer

51‧‧‧Laminates(3)

52‧‧‧Optical laminates

60‧‧‧Optical film (resin film)

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

Figure 2 (a) and (b) are schematic cross-sectional views schematically showing an example of the manufacturing steps of the laminate (1).

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

Figure 4 (a) and (b) are schematic cross-sectional views schematically showing an example of the manufacturing steps of the laminate (2).

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

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

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

Preferred embodiments of the laminate (1), laminate (2), and laminate (3), and the manufacturing methods of the laminates (1) to (3) and the optical laminate are described below with reference to the drawings. Each embodiment shown below and its modifications can be combined arbitrarily. In each embodiment and its modifications, the same members as those described in the previous embodiment or its modifications are attached with 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 contains the first substrate layer 11, the first functional layer 12, the adhesive layer 30, the second functional layer 22, and the second substrate layer 21 in sequence. In 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 from [a] to [c]. [b] located on the outside in the width direction from the position of the end of the first functional layer 12; and [c] at the same position as the end of the second functional layer 22, or located on the inside in the width direction from the position of the end of the second functional layer 22.

In addition, the position of each end described in the above-mentioned prerequisites [a] to [c] is 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 substrate layer 11 functions as a supporting layer or a protective layer, wherein the supporting layer supports the first functional layer 12 formed on the first substrate layer 11 , and the protective layer protects the first functional layer 12 . Each of the first base material layer and the second base material layer may be a layer of a multi-layer laminated film. The first base material layer 11 may have a film exhibiting a polarizing function.

The second substrate layer 21 functions as a supporting layer or a protective layer, wherein the supporting layer supports the second functional layer 22 formed on the second substrate layer 21 , and the protective layer protects 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 exhibiting releasability, and when exhibiting releasability, it can be peeled from the second functional layer 22 .

The first functional layer 12 may be an optical film or a liquid crystal layer exhibiting optical properties such as polarization properties or optical compensation functions, or a layer constituting a touch sensor, 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 of the liquid crystal layer is referred to as "the first liquid crystal layer"). The first liquid crystal layer can 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, and a polarizing layer, more preferably a retardation layer.

The second functional layer 22 can be a film layer exhibiting optical properties such as polarization properties or optical compensation functions, or a layer constituting a touch sensor, and can be a resin film or a liquid crystal layer. The second functional layer 22 is preferably a liquid crystal layer containing a liquid crystal compound (hereinafter, the second functional layer 22 of the liquid crystal layer is referred to as "the 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 bonding layer 30 is bonding the second functional layer 22 , the first substrate layer 11 and the first functional layer 12 . In 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 above-mentioned relationships from [a] to [c].

Specifically, in the cross section of the laminate (1) 41 in the width direction, the position of the end of the bonding layer 30 is: the same as the end of the first base material layer 11, or located on the inside in the width direction; located on the outside of the end of the first functional layer 12 in the width direction; and the same as the end of the second functional layer 22, or located on the inside in the width direction.

In at least one end in the width direction of the laminate (1) 41 shown in FIG. 1, the position of the end of the first base material layer 11 is located on the outside in the width direction compared to the position of the end of the first functional layer 12, and the position of the end of the second base material layer 21 is located on the outside in the width direction compared to the position of the end of the second functional layer 22. In at least one end of the laminate (1) 41 in the width direction, 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 located on the inner side of 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 as described later, the laminate (2) 42 can be obtained by peeling the second base material layer 21 from the laminate (1) 41 (FIG. 3 ).

In at least one end of the laminate (1) 41 in the width direction, the position of the end of the adhesive layer 30 is the same as that of the end of the second functional layer 22, or positioned on the inner side in the width direction (satisfying the relationship of [c] above), so that the state where the adhesive layer 30 is not bonded to the second base material layer 21 can be formed. Therefore, the second base material layer 21 can be peeled from the laminate (1) 41 . In addition, in at least one end of the adhesive layer 30 in the width direction, the position of the end of the adhesive layer 30 is the same as that of the end of the first base material layer 11 or is located on the inner side in the width direction, and is located on the outer side in the width direction than the end of the first functional layer 12 (satisfying the relationship between [a] and [b] above), so that the following state can be formed: the region containing at least one end of the second functional layer 22 is bonded to the first base material layer 11 through the adhesive layer 30. Therefore, the peeling force for separating the laminate (1) 41 between the adhesive layer 30 and the first base layer 11 is greater than the peeling force for separating the second functional layer 22 and the second base layer 21 . Due to the difference in peeling force, when the second base material layer 21 is to be peeled off from the laminate (1) 41, the separation between the adhesive layer 30 and the first base material layer 11 becomes more difficult, whereby the separation between the second base material layer 21 and the second functional layer 22 becomes easier than the separation between the first base material layer 11 and the first functional layer 12 becomes difficult. Therefore, the second base material layer 21 can be peeled suitably from the laminate (1) 41 .

On the other hand, for example, in the laminated body 41p shown in FIG. 7, when the position of the widthwise end of the adhesive layer 30p is the same as that of the respective widthwise end of the first functional layer 12p and the second functional layer 22p, or is located on the inner side (when the above [b] is not satisfied), when the second base material layer 21p is to be peeled off, the laminated body 41p will not be separated between the second base material layer 21p and the second functional layer 22p, but will be separated between the first base material layer 11p and the first functional layer. Separation between 12p causes a defect that the second base material layer 21 cannot be peeled off from the laminate 41 .

In the laminate (1) 41, as described above, the position of the end of the adhesive layer 30 satisfies all of the above-mentioned relationships from [a] to [c], whereby the second base material layer 21 is easily peeled off, and the laminate (1) 41 is easily separated between the second base material layer 21 and the second functional layer 22p, so it is easy to obtain the laminate (2) 42 (FIG. 3 ) described later.

The laminated body (1) 41 shown in FIG. 1 can be set in such a manner that the peeling force is the force required for separation between specific layers. The peel force (i) may be greater than or less than the peel force (ii). The peel force (i) is the force required to separate the laminate (1) 41 between the first base layer 11 and the first functional layer 12. The peel force (ii) is the force required to separate the laminate (1) 41 between the second base layer 21 and the second functional layer 22. The peeling force (iii) is preferably greater than the peeling force (i) and the peeling force (ii). The peeling force (iii) is the force required to separate the laminate ( 1 ) 41 between the adhesive layer 30 and the first base material layer 11 . 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))

The schematic cross-sectional views of Fig. 2 (a) and (b) schematically show an example of the manufacturing steps of the laminate (1) 41 . In the figure, W represents the width direction. The manufacturing method of the laminate (1) includes the following steps: a step of preparing the first laminated part 10 including the first base material layer 11 and the first functional layer 12 (Fig. 2 (a)); a step of preparing the second laminated part 20 including the second substrate layer 21 and the second functional layer 22 (Fig. 2 (b)); Steps of layer section 20 (Fig. 1).

As shown in FIG. 2( a ), the first build-up part 10 only needs to have 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 build-up part 10 .

When the first functional layer 12 is the first liquid crystal layer, a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound can be coated on the first base material layer 11, and the polymerizable liquid crystal compound can be polymerized on the first base material layer 11 to form the first functional layer 12, thereby preparing the first build-up part 10.

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

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

As shown in FIG. 2( b ), the second buildup part 20 only needs to have 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 in a detachable manner using an adhesive or an adhesive to prepare the second laminated part 20 .

When the second functional layer 22 is the first liquid crystal layer, a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound can be coated on the second base material layer 21, and the polymerizable liquid crystal compound can be polymerized on the second base material layer 21 to form the second functional layer 22, thereby preparing the first build-up part 10.

As exemplified in JP2017-083843, the second functional layer can be used as a polarizing layer by forming the second functional layer 22 with a composition for forming a liquid crystal layer containing a dichroic dye.

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

The step of laminating the first laminated part 10 and the second laminated part 20 may include the following steps: forming an adhesive composition layer on at least one of the first functional layer 12 side of the first laminated part 10 and the second functional layer 22 side of the second laminated part 20, and the adhesive composition layer is used to form the adhesive layer 30. The step of laminating the first build-up part 10 and the second build-up part 20 may include the steps of: laminating the first build-up part 10 and the second build-up part 20 so that the first functional layer 12 and the second functional layer 22 face each other through the adhesive composition layer, and forming the adhesive layer 30 from the adhesive composition layer. The step of forming the adhesive layer 30 from the adhesive composition layer can be appropriately carried out according to the components contained in the adhesive composition layer. For example, when the adhesive composition layer needs to be hardened, the step of implementing a hardening treatment can be performed. When no hardening treatment is required, the adhesive composition layer can be directly used as an adhesive layer.

When there is a step of forming an adhesive composition layer in the first buildup part 10, the adhesive composition layer is preferably formed in such a manner that at least one end of the adhesive composition layer in the width direction is located on the outer side in the width direction than the end of the first functional layer 12, and is the same as the end of the first base material layer 11, or on the inner side in the width direction. When there is a step of forming an adhesive composition layer in the second build-up part 20, when the first build-up part 10 and the second build-up part 20 are laminated, the adhesive composition layer is preferably formed in the following manner: at least one end of the adhesive composition layer in the width direction is at the same position as the end of the second functional layer 22, or on the inner side in the width direction.

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 may be modified as shown below. In addition, the above-mentioned embodiment and the modified examples shown below can be combined arbitrarily.

(Modification 1 of Embodiment 1)

The positions of the ends in the width direction of the adhesive layer 30 at one end in the width direction of the laminate (1) may satisfy all of the above-mentioned relationships from [a] to [c], and the positions of the ends in the width direction of the adhesive layer 30 at both ends in the width direction of the laminate (1) may also satisfy all of the relationships from [a] to [c] above.

(Modification 2 of Embodiment 1)

The laminate (1) 41 may further contain 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 opposite to the first functional layer of the first base material 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 . When 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 manufacturing method of the laminate (1), the first laminate part may also have a first alignment layer between the first substrate layer 11 and the first functional layer 12, and the second laminate part may also have a second alignment layer between the second substrate 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, in at least one end of the laminate (1) 41 in the width direction, the position of the end of the first alignment layer can be the same as the end of the first base material layer 11 or located on the inner side in the width direction, or the same position as the end of the first functional layer 12, or can be located on the inner side or the outer side in the width direction.

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

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

(laminate (2))

The schematic sectional view in Fig. 3 schematically shows an example of the laminate (2). In the figure, W represents the width direction. As shown in Figure 3, the laminate (2) 42 contains the first substrate layer 11, the first functional layer 12, the adhesive layer 30, and the second 'functional layer 22' in sequence. In 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 relations [a], [b], and [d]. 1. The position of the end of the functional layer 12 is closer to the outside in the width direction, and [d] is the same as the position of the end of the second 'functional layer 22'.

In addition, the positions of the ends described in the requirements of [a], [b], and [d] above are the positions in the cross section of the laminated body (2) 42 in the width direction, and when the relationship between the positions of the ends of each layer is defined below, it is also the position in the cross section of the laminated body (2) 42 in the width direction.

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

The first base material layer 11 and the first functional layer 12 are the same as those described in the previous embodiment.

The second 'functional layer 22' can be an optical film exhibiting optical properties such as polarization properties or optical compensation functions, or a liquid crystal layer, a layer constituting a touch sensor, etc., and can 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' belonging to the liquid crystal layer is referred to as "the 2' liquid crystal layer"). The second 'functional layer 22' can be, for example, a cured film formed by polymerizing a polymerizable liquid crystal compound. As will be described later, the 2nd 'functional layer 22' may be a layer derived from the 2nd functional layer 22. The second' 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 from the first functional layer 12, or may have a film that exhibits a polarizing function.

The bonding layer 30 is bonding the 2' functional layer 22 ′, the first substrate layer 11 and the first functional layer 12 . In 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 above-mentioned relationships of [a], [b], and [d]. Specifically, in the cross section of the laminate (2) 42 in the width direction, the position of the end of the bonding layer 30 is the same as the position of the end of the first base material layer 11 or located on the inner side in the width direction, and the position on the outer side in the width direction than the position of the end of the first functional layer 12, and is located at the end of the second 'functional layer 22'.

In at least one end of the width direction of the laminate (2) 42 shown in FIG. 3, the position of the end of the first base material layer 11 is closer to the outside in the width direction than the position of the end of the first functional layer 12, and is further outside in the width direction than the position of the end of the second 'functional layer 22'. Also, 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 closer in the width direction than the position of the end of the second 'functional layer 22'.

The laminate (2) 42 can be obtained by peeling off the 2nd base material layer 21 from the laminate (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))

Figure 4 (a) and (b) are schematic cross-sectional views schematically showing an example of the manufacturing steps 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 manufacturing method of the laminate (2) has the following steps: a step of preparing the laminate (1) 41 (FIG. 4 (a)); and a step of peeling the second substrate layer 21 from the laminate (1) 41 (FIG. 4 (b)).

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

In the laminate (1) 41, the second substrate layer 21 is peelable relative to the second functional layer 22, and the position of the end of the adhesive layer 30 in at least one end in the width direction of the laminate (1) 41 satisfies all of the above-mentioned relationships from [a] to [c]. Therefore, the laminate (2) 42 shown in FIG. 3 and FIG. 4 (b) can be obtained by peeling off the 2nd base material layer 21 from the laminate (1) 41.

In the cross section of the laminated body (1) 41 in the width direction shown in Figure 4 (a), the second functional layer 22 has: an adhesive layer formation area 22x in the area where the adhesive layer 30 is provided, and an adhesive layer non-formation area 22y in the area where the adhesive layer 30 is not provided (in Figure 4 (a), the part indicated by the upper right oblique line). 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, it is fixed to the adhesive layer 30 and is not easily peeled off together with the second base material layer 21 . On the other hand, the adhesive layer-unformed region 22y is not fixed to the adhesive layer 30 and is easily peeled 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. 4(b), the second functional layer 22 is divided in such a manner that the adhesive layer forming region 22x exists on the adhesive layer 30 and the adhesive layer non-forming 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 laminate (2) 42 can be obtained by peeling off the 2nd base material layer 21 from the laminate (1) 41.

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

The laminated body (2) and its manufacturing method can be changed into the modified examples shown below. Any combination of the above-mentioned embodiment and the modified examples described below can be used.

(Modification 1 of Embodiment 2)

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

(Modification 2 of Embodiment 2)

The laminate (2) 42 may further contain 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 opposite to the first functional layer 12 of the first base material layer 11 .

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 substrate layer and the first functional layer, in at least one end of the laminate (2) 42 in the width direction, the position of the end of the first alignment layer may be the same as the end of the first substrate layer or located on the inner side in the width direction, or the same as the width end of the first functional layer, and may also be located on the inner side or the outer side in the width direction.

When the laminate (2) 42 has a second alignment layer, in at least one end of the laminate (2) 42 in the width direction, the position of the end of the second alignment layer can be the same as that of the end of the 2′ functional layer, or it can be located on the inner side in the width direction.

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 or a second alignment layer. When the laminate (1) has a second alignment layer between the second substrate layer and the second functional layer, the laminate (2) can be obtained by peeling off the second alignment layer together with the second substrate layer, or the second substrate layer can be peeled off in such a way that the second alignment layer exists on the second functional layer. At this time, similar to the second functional layer, the second alignment layer in the laminate (1) can be divided into a region existing on the second base layer and a region existing on the 2′ functional layer when the second base layer is peeled off.

The peeling force between the layers of the second base material layer, the second alignment layer, and the second functional layer can be used to adjust the peeling of the second base material layer and the second alignment layer from the laminate (1) containing the second alignment layer, or only the second base material layer. The peeling force can be adjusted by, for example, the components contained in each layer or the surface treatment performed on the surface of each layer. For example, the peel force between the second alignment layer and the second base layer or the second functional layer can be adjusted by the type or amount of additives contained in the second alignment layer or the second functional layer, or by performing surface treatments such as corona treatment, plasma treatment, flame treatment, etc. on the side surface of the second alignment layer of the second base layer or the surface of the second alignment layer disposed on the second base layer.

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

(Laminate (3))

Fig. 5 is a schematic 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 substrate layer 11, the first functional layer 12, the adhesive layer 30, and the second 'functional layer 22'), and an optical film 60 (resin film), and the optical film 60 is laminated on the side of the second 'functional layer 22' of the laminate (2) 42 via the adhesive layer 36 for the optical film (adhesive layer for the resin film).

The laminate (3) 51 can 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 optical films, and the optical film 60. As described in the previous embodiment, 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 this order.

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

In addition, the position of each end of each layer forming the laminate (3) 51 is a position in the cross section of the laminate (3) 51 in the width direction.

The optical film bonding layer 36 is bonding the optical film 60 and the 2nd' functional layer 22'. In at least one end in the width direction of the laminate (3) 51 shown in Fig. 5, the position of the end of the adhesive layer 36 for an optical film may be the same as that of the first base material layer 11 or on the inner side in the width direction. In particular, the position of the end portion of the adhesive layer 36 for the optical film is the same as the end portion of the optical film 60 or located on the inner side in the width direction thereof, and is the same as or located on the inner side in the width direction of the outermost layer in the width direction of the laminate (2) 42, whereby the adhesive layer 36 for the optical film can prevent the adhesive layer 36 for the optical film from seeping out from the laminated body (3) to contaminate the conveyance path, etc., so it is preferable.

In at least one end in the width direction of the laminate (3) 51 shown in FIG. 5, the position of the end of the adhesive layer 36 for an optical film is the same as that of the end of the first functional layer 12, or located on the inner side in the width direction.

The laminate (3) 51 can be used to obtain an optical laminate 52 (FIG. 6(b)) as will be described later. For example, the optical layered body 52 can be obtained by peeling the 1st base material layer 11 from the laminated body (3) 51.

Although the details will be described later, by peeling off the first base layer 11, the intermediate layer 45 between the first base layer 11 and the optical film adhesive layer 36 (the layer including the second 'functional layer 22', the adhesive layer 30, and the first functional layer 12) can be divided into a region on the outside of the end of the optical film adhesive layer 36 in the width direction (hereinafter referred to as "outer region"), and a region on the inside of the width direction (hereinafter referred to as "inner region") (Fig. 6 (a), (b)).

As described above, in the laminate (3) 51, when the position of the end of the adhesive layer 36 for the optical film is the same as the position of the end of the first functional layer 12, or is located on the inner side in the width direction, the outer region of the intermediate layer 45 divided by peeling off the first base layer 11 is a region where the adhesive layer 30 is attached to the first base layer 11, and the inner region is a region where the first functional layer 12 or a part thereof exists on the first base layer 11 (Fig. 6 (a), (b)).

As described in the previous embodiment, the first base material layer 11 can be peeled off from the first functional layer 12, so in the outer region, separation between the first base material layer 11 and the adhesive layer 30 is difficult to occur, and in the inner region, separation between the first base material layer 11 and the first functional layer 12 is easy to occur. Therefore, when the first base material layer 11 is peeled off from the laminate (3) 51, the intermediate layer 45 is divided such that an outer region exists on the first base material layer 11 and an inner region exists on the adhesive layer 36 for an optical film, and the first base material layer and the first functional layer can be separated in the inner region. Therefore, the optical layered body 52 can be obtained by peeling the 1st base material layer 11 from the laminated body (3) 51 (FIG. 6(b)).

(Manufacturing method of laminate (3))

The manufacturing method of the laminate (3) 51 (FIG. 5) has the following steps: a step of preparing the laminate (2) 42 (FIG. 3 or FIG. 4 (b)); and a step of laminating the optical film 60 (resin film) on the 2nd 'functional layer 22' side of the laminate (2) 42 via the adhesive layer 36 (adhesive layer for the resin film) for the optical film (FIG. 5).

As shown in FIG. 3 or FIG. 4 (b), the laminate (2) can be prepared by the manufacturing method described in the previous embodiment. The laminate (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 above-mentioned.

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 composition layer for an optical film is formed, and the optical film 60 and the 2nd 'functional layer 22' are bonded together, whereby the optical film 60 can be laminated. The adhesive composition layer for an optical film is used to form the adhesive layer 36 for an optical film. The method of forming the adhesive layer 36 for an optical film from the adhesive composition layer for an optical film can be appropriately carried out in response to the components contained in the adhesive composition layer for an optical film. For example, when the adhesive composition layer for an optical film needs to be hardened, the step of hardening treatment can be carried out. When no hardening treatment is required, the adhesive composition layer for an optical film can be directly used as an 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 the optical film is the same as the position of the end of the first functional layer 12, or is located on the inner side in the width direction, it is preferable to arrange the position of the end of the adhesive composition layer for the optical film to be the same as the position of the end of the first functional layer 12 in the width direction, or to be placed on the inner side in the width direction. For example, when there is a step of forming an adhesive composition layer for an optical film on the second 'functional layer 22' side of the laminate (2) 42, the position of the end of the adhesive composition layer for an optical film may be the same as that of the end of the first functional layer 12 in the width direction, or may be formed in such a manner that it is closer to the inner side in the width direction. 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 via the adhesive composition layer for an optical film, it is preferable to form it so that the position of the end portion in the width direction of the adhesive composition layer for the optical film is the same as that of the end portion in the width direction of the first functional layer 12, or is formed on the inner side in the width direction.

The laminate (2) 42 used in the manufacturing method of the laminate (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 modified as shown below. In addition, the above-mentioned embodiment and the modified examples described below can be combined arbitrarily.

In addition, the laminate (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, an adhesive layer and a release film may be sequentially provided on the side opposite to the adhesive composition layer for optical films of the optical film 60.

(Modification 1 of Embodiment 3)

In 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 located outside in the width direction from the position of the end in the width direction of the first functional layer. At this time, even if the first substrate layer is peeled off from the laminate (3) 51, the inner region of the intermediate layer 45 (in the cross section of the laminate (3) 51 in the width direction, the region inside the end of the adhesive layer for the optical film) also includes a region where the adhesive layer is next to the first substrate layer, so the separation between the first substrate layer and the first functional layer is difficult. When the position of the end in the width direction of the adhesive layer for an optical film is located on the outside in the width direction compared to the position of the end in the width direction of the first functional layer, the end of the laminate (3) 51 can be removed from the position of the end in the width direction of the first functional layer 12 or on the inside in the width direction, thereby peeling off the first base material layer 11 from the laminate (3) 51.

(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 the laminate (adhesive layer for resin film) may be used instead of the adhesive layer 36 for the optical film, and an optical film such as a polarizing plate may be used instead of the first substrate layer 11 forming the laminate (3) 51.

The adhesive layer system for laminates can be used for bonding a laminate (3) to an optical display element, for example, by peeling off a release mold at an appropriate timing.

(Modification 3 of Embodiment 3)

In the laminate (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, a first alignment layer can be further provided between the first substrate layer 11 and the first functional layer, and a second alignment layer can be further provided between the second 'functional layer 22' and the adhesive layer 36 for optical films.

When the laminate (3) 51 has a first alignment layer, in at least one end of the laminate (3) in the width direction, the position of the end of the first alignment layer may be the same as the end of the first base material layer or located on the inner side in the width direction, or it may be the same as the end of the first functional layer, or it may be closer to the inner side or the outer side in the width direction. When the laminate (3) 51 has the second alignment layer, the position of the end of the second alignment layer may be the same as that of the second 'functional layer 22' and the end, or may be located on the inner side in the width direction.

When the laminate (3) has a second alignment layer, prepare the laminate (2) and the optical film with the second alignment layer, and laminate the optical film on the side of the second alignment layer of the laminate (2) with the adhesive layer 36 interposed therebetween.

[Embodiment 4 (Method for Manufacturing Optical Laminated Body)]

Fig. 6 is a schematic cross-sectional view schematically showing an example of the manufacturing steps of the 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 layered body 52 has the following steps: the step of preparing the layered body (3) 51 (FIG. 6 (a)); and the step of peeling the first substrate layer 11 from the layered body (3) 51 (FIG. 6 (b)).

As shown in FIG. 6(b), the optical laminate 52 sequentially 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. 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 optical films, and the optical film 60 in this order.

The optical laminate 52 is at least one end in its width direction, for example, as shown in Fig. 6 (b), the positions of the first 'functional layer 12', the adhesive layer 30', the second "functional layer 22", and the optical film adhesive layer 36 are the same at each end. The optical layered body 52 shown in Fig. 6 (b) shows that the position of the end of the optical film 60 is closer to the outside in the width direction than the position of the end of the adhesive layer 36 for the optical film.

In addition, the position of each end portion of each layer forming the optical layered body 52 is a position in the cross section of the optical layered body 52 in the width direction.

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

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

In the laminate (3) 51 shown in FIG. 6 (a), the first base material layer 11 can be peeled off with respect to the first functional layer 12, but the position of the end of the adhesive layer 30 is located outside the position of the end of the first functional layer 12 in the width direction. Therefore, in the laminate (3) 51 shown in FIG. 6 (a), in the area where the adhesive layer 30 exists outside the end of the first functional layer 12, separation between the first base material layer 11 and the adhesive layer 30 is difficult to occur, but in the inner side of the end of the first functional layer, separation between the first base material layer 11 and the first functional layer 12 is easy to occur.

As mentioned above, in the laminated body (3) 51 shown in FIG. 6 (a), the position of the end of the adhesive layer 36 for an optical film is the same as the position of the end of the first functional layer 12, or located on the inner side in the width direction. Therefore, if the first substrate layer 11 is to be peeled off from the laminate (3) 51, as shown in Fig. 6 (a) and (b), the second 'functional layer 22' will be divided between the area where the adhesive layer 36 for the optical film is installed and the area where the adhesive layer 36 is not installed. part of. In addition, in the cross section of the laminated body (3) 51 in the width direction, when the position of the end of the first functional layer 12 is closer to the inside in the width direction than the position of the end of the adhesive layer 36 for optical films, it will be divided into a part on the outside and a part on the inside of the position of the end of the adhesive layer 36 for optical films. The boundary part in the width direction of the functional layer 12 and the adhesive layer 30 is divided.

As mentioned above, if the first substrate layer 11 is peeled off from the laminate (3) 51 shown in FIG. And the first functional layer 12 . The outer area has an area where the first base material layer 11 is followed by the adhesive layer 30, and the inner area is an area where the first functional layer 12 or a part thereof exists on the first base material layer 11. Therefore, in the outer area, the separation between the first base material layer 11 and the adhesive layer 30 is difficult to occur, but in the inner area, the first base material layer 11 can be peeled off relative to the first functional layer 12, so the first base material layer 11 and the first functional layer 12 are easily separated. Therefore, when the first base material layer 11 is peeled off from the laminate (3) 51, as shown in FIG. 6 (b), the intermediate layer 45 is divided in such a way that there is an outer region on the first base material layer 11 and an inner region on the adhesive layer 36 for an optical film, and the first base material layer and the first functional layer can be separated in the inner region. As a result, an optical laminate 52 in which the respective 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 in the same position can be obtained.

The manufacturing method of the optical layered body 52 may further include the step of providing an adhesive layer for a layered body on the side opposite to the adhesive layer 30' of the first 'functional layer 12' of the optical layered body 52. The adhesive layer for laminates can be used for bonding an optical layered body to an optical display element.

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

In the optical laminate 52, the optical film 60 is used as a linear polarizer, the second "functional layer 22" is used as a 1/2 wavelength plate, and the first 'functional layer 12' is used as a 1/4 wavelength plate, thereby making the optical laminate 52 a circular polarizer. The optical film 60 is used as a linear polarizing plate, the second "functional layer 22" is used as a reverse wavelength dispersion 1/4 wavelength plate, and the first 'functional layer 12' is used as a positive-C plate, thereby making the optical laminate 52 a circular polarizing plate.

The optical layered body 52 and its manufacturing method can be modified as shown below. Any combination of the above-mentioned embodiment and the modified examples described below can be used.

(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 optical film adhesive layer 36, and the optical film 60. In the optical laminate 52, 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, there may be a first alignment layer on the opposite side of the first 'functional layer 12' to the adhesive layer 30', or there may be a second alignment layer between the second "functional layer 22" and the optical film adhesive layer 36.

When the optical laminate has a first alignment layer, in at least one end in the width direction of the optical laminate, the position of the end of the first alignment layer may be the same as that of the end of the first 'functional layer 12', or it may be located on the inner side in the width direction. When the optical layered body has the first alignment layer, the layered body (3) used to manufacture the optical layered body has the first 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 can be peeled off together with the first base material layer to obtain the optical laminate 52 shown in FIG. At this time, similarly to the intermediate layer 45, when the first substrate layer is peeled off, the first alignment layer in the laminate (3) can be divided into a region on the outside in the width direction and a region on the inside in the width direction relative to the end of the adhesive layer 36 for the optical film in the width direction.

When the optical laminate has a second alignment layer, in at least one end in the width direction of the optical laminate, the position of the end of the second alignment layer can be the same as that of the end of the second "functional layer 12", or it can be located on the inner side in the width direction. When the optical layered body has the second alignment layer, the layered body (3) used to manufacture the optical layered body has the second alignment layer.

(Modification 2 of Embodiment 4)

In the method of manufacturing the optical layered body 52 , a release film and an adhesive layer for a laminate can be used instead of the optical film and the adhesive layer for the optical film, thereby manufacturing a laminate including the release film. The manufacturing method of the optical layered body may include the step of providing an optical film on the side opposite to the adhesive layer of the 2′ functional layer via an adhesive layer for an optical film.

Embodiments and modifications of the present invention have been described above, but the present invention is not limited to these embodiments and modifications, and can be implemented by combining the structures and steps of the above-mentioned embodiments and modifications thereof, for example. The items common to all the embodiments and modifications thereof will be described in detail below.

(1st substrate layer and 2nd substrate layer)

The first base material layer and the second base material layer (hereinafter, both are 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, elongation, etc. is used. Specifically, polyolefin-based resins such as polyethylene and polypropylene; cyclic polyolefin-based resins such as norbornene-based polymers; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; (meth)acrylic resins such as (meth)acrylic acid and polymethyl(meth)acrylate; Polyarylate-based resins; Polyarylate-based resins; Polyether-based resins; Polyether-based resins; Polyamide-based resins; Polyimide-based resins; Polyetherketone-based resins; Polyphenylene sulfide-based resins; Polyphenylene ether-based resins, and their mixtures, copolymers, etc. Among these resins, it is preferable to use any one of cyclic polyolefin-based resins, polyester-based resins, cellulose ester-based resins, and (meth)acrylic resins, or a mixture thereof. In addition, the above-mentioned "(meth)acrylic acid" means "at least one of acrylic acid and methacrylic acid".

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

<front panel>

The role of the front panel is to suppress warping of image display elements such as liquid crystal cells and to protect image display elements, and is, for example, a translucent (preferably optically transparent) plate-shaped body. The front panel can be of a single-layer construction or a multi-layer construction.

The front panel is arranged on the outermost surface of the final product containing the polarizing plate of the present invention, so it is required to show sufficient durability when used outdoors or semi-outdoors. From such a viewpoint, the front panel is preferably composed 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 or tempered glass may be used, especially for flexible displays, resin films are preferred, and polyamide films, polyamideimide films or polyimide films, polyester-based films, olefin-based films, acrylic-based films, and cellulose-based films are more preferred. In the polymer film, it is preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles, and the like.

The flexible front panel made of a 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 substrate layer may be a single layer of one type of resin or a mixture of two or more types, or may be a multilayer structure of two or more layers. When having a multilayer structure, the resins forming each layer may be the same or different from each other. When the base material layer is a film formed of a resin material, optional additives may be added to the base material layer. Examples of additives include ultraviolet absorbers, antioxidants, slip agents, plasticizers, release agents, anti-staining agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.

The thickness of the substrate layer is not particularly limited, but generally, it is preferably 1 to 300 μm, more preferably 10 to 200 μm, and still 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 first alignment layer and the second alignment layer that may be included in the optical laminate (hereinafter both collectively referred to as "alignment layer") have an alignment regulation force, and the alignment regulation force is to align the liquid crystal in the desired direction in the polymerizable liquid crystal compound contained in the liquid crystal layer formed thereon. 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 multiple grooves on the surface of the layer. The thickness of the alignment layer is usually 10 to 500 nm, preferably 10 to 200 nm.

The alignment polymer layer can be formed by applying a composition having an alignment polymer dissolved in a solvent to the substrate layer, removing the solvent, and performing brushing treatment if necessary. At this time, in the alignment polymer layer formed by the alignment polymer, the alignment regulation force can be adjusted arbitrarily by the surface state of the alignment polymer or the brushing conditions.

The photo-alignment polymer layer can be formed by applying a composition containing a polymer having a photoreactive group or a monomer and a solvent to the substrate layer, and then irradiating polarized light. In this case, in the photo-alignment polymer layer, the alignment regulation force can be arbitrarily adjusted by the polarized light irradiation conditions etc. for the photo-alignment polymer.

The groove alignment layer can be formed, for example, by the following methods: a method of exposing, developing, etc., on the surface of the photosensitive polyimide film through an exposure mask having pattern-shaped slits to form a concave-convex pattern; a method of forming an uncured layer of an active energy ray-curable resin on a plate-shaped master having grooves on the surface, transferring this layer to a base layer and hardening it; And the method of hardening, etc.

(1st functional layer and 2nd functional layer)

The first functional layer and the second functional layer (hereinafter collectively referred to as "functional layers") may include optical films exhibiting optical properties such as polarization properties or optical compensation functions, or liquid crystal layers, layers constituting touch sensors, etc., and may be resin films or liquid crystal layers.

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

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

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 polymerizable liquid crystal compound, a solvent, and a composition for forming a liquid crystal layer containing various additives may be coated on the alignment layer to form a coating film, and the liquid crystal layer of the liquid crystal hardened layer is formed by curing the coating film. Alternatively, the composition for forming a liquid crystal layer may be coated on the substrate layer to form a coating film, and the coating film may be stretched together with the substrate layer to form the liquid crystal layer. The liquid crystal layer may be a retardation 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 above-mentioned polymerizable liquid crystal compound and solvent. As the polymerizable liquid crystal compound, solvent, polymerization initiator, reactive additive, leveling agent, polymerization inhibitor, etc., known ones can be appropriately used.

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

(optical film)

The optical film can 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 with a protective film on at least one surface of the polarizing plate, a reflective film, a semi-transmissive reflective film, a luminance enhancement film, an optical compensation film, a film with anti-glare function, a retardation film, etc. It may have one of these, or it may have a multilayer structure of two or more. Moreover, an optical film may contain a liquid crystal layer, and this liquid crystal layer may be a retardation layer. In the present specification, the "polarizing layer" refers to a layer having a property of transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis when non-polarized light is incident.

The polarizing layer that can be contained in the optical film can be a single-layer polyvinyl alcohol resin film with a dichroic dye adsorbed and aligned, or a laminated film with two or more layers of a polyvinyl alcohol resin layer adsorbed and aligned with a dichroic dye disposed on the base film. Also, the polarizing layer may be a cured film in which a dichroic dye is aligned with a polymerizable liquid crystal compound and the polymerizable liquid crystal compound is polymerized. In this case, the polarizing layer may be a liquid crystal layer.

The liquid crystal layer that the optical film may contain is formed by polymerizing a polymerizable liquid crystal compound. On the substrate layer or on the alignment layer provided on the substrate layer, a liquid crystal layer forming composition containing a polymerizable liquid crystal compound can be applied and dried, and the polymerizable liquid crystal compound can be polymerized and cured by irradiating active energy rays such as ultraviolet rays to form a liquid crystal layer.

<Retardation film>

The retardation film is a film that provides a retardation in a direction (in-plane direction of the film) perpendicular to the direction in which incident light proceeds. The aforementioned retardation film may be a stretched retardation film produced by stretching polymer films such as cellulose-based films, olefin-based films, and polycarbonate-based films. The thickness of the aforementioned stretched retardation film may be less than 200 μm, preferably 1 μm to 100 μm. When the thickness exceeds 200 μm, the flexibility will decrease.

Moreover, as another example of the aforementioned retardation film, a liquid crystal coating type retardation film formed by coating a liquid crystal composition on a polymer film may be used. The aforementioned liquid crystal composition includes a liquid crystal compound having the property of displaying liquid crystal states such as nematic, cholesteric, and matrix types. In the liquid crystal composition, any compound containing a liquid crystal compound has a polymerizable functional group. In the same manner as described above for the liquid crystal polarizing layer, a liquid crystal composition is coated on an alignment film and cured to form a liquid crystal retardation layer, whereby the liquid crystal coating type retardation film can be manufactured.

In addition, the aforementioned retardation film may be a single layer or a multilayer, and may also be a layered retardation film and a liquid crystal retardation film.

<Polarizing layer>

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

[Linear Polarizer]

The linear polarizer can be a film-type polarizer manufactured by dyeing and stretching a polyvinyl alcohol (PVA) film. Polarizing performance can be exhibited by adsorbing dichroic dyes such as iodine on the PVA film that is stretched and aligned, or by stretching and aligning dichroic dyes in the state of adsorbing PVA. When manufacturing the aforementioned film-type polarizer, additional steps such as swelling, crosslinking by boric acid, washing by aqueous solution, and drying may be included. The stretching or dyeing step may be performed on a PVA-based film alone, or may be performed in a state of being laminated with another film such as polyethylene terephthalate. The PVA film used is preferably 10 to 100 μm, and the elongation ratio is 2 to 10 times.

The aforementioned film-type polarizer may have a protective film described later on at least one surface. When laminating and stretching with other substrates, the substrate can be peeled off after affixing a protective film to the polarizer surface, or the stretched substrate can be used as a protective film as it is.

In addition, as another example of the aforementioned polarizer, a liquid crystal coating type polarizer formed by coating a liquid crystal polarizing composition may be used. The aforementioned liquid crystal polarizing composition may contain a liquid crystal compound and a dichroic dye compound. The liquid crystal polarizing composition is coated on the alignment film to form a liquid crystal polarizing layer, so that the aforementioned liquid crystal polarizing layer can be manufactured. Compared with film-type polarizers, the thickness of the liquid crystal polarizer layer can be formed thinner. The thickness of the aforementioned liquid crystal polarizing layer may be 0.5 to 10 μm, preferably 1 to 5 μm.

For example, the above-mentioned alignment film can be produced by coating an alignment film-forming composition on a substrate, and imparting alignment by brushing, polarized light irradiation, and the like. The above-mentioned liquid crystal polarizing layer may be laminated by peeling off the substrate and transferred, or directly laminated on the above-mentioned substrate. As the base material, a polymer film as exemplified for the protective film described later can be used.

As long as the protective film is a transparent polymer film, the materials and additives used for the transparent base material can be used. Preferable are cellulose-based films, olefin-based films, acrylic-based films, and polyester-based films. It can be a coating-type protective film obtained by applying a cation-curing composition such as epoxy resin or a radical-curing composition such as acrylate and curing it. Plasticizers, ultraviolet absorbers, infrared absorbers, coloring agents such as pigments or dyes, fluorescent whitening agents, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, lubricants, solvents, etc. may be contained as needed. The thickness of the aforementioned protective film may be less than 200 μm, preferably 1 μm to 100 μm. When thickness exceeds 200 micrometers, flexibility will fall.

[Circular Polarizer]

The circular polarizer is a functional layer that has the function of transmitting only right or left circularly polarized light components by laminating a λ/4 retardation plate on a linear polarizer. For example, it is used to convert the external light into right circularly polarized light, and block the external light reflected by the organic EL panel as left circularly polarized light. By only passing through the luminescent component of the organic EL, the influence of reflected light can be suppressed, and the image can be made clearer. In order to achieve the circular polarization function, the absorption axis of the linear polarizer and the slow axis of the λ/4 phase difference plate should theoretically be 45°, but the practical value is 45±10°. The linear polarizer and the λ/4 retardation plate do not have to be adjacent to each other and laminated, as long as the relationship between the absorption axis and the slow axis satisfies the aforementioned range. It is preferable to achieve complete circular polarization at all wavelengths, but it is not necessary in practice, so the circular polarizing plate in the present invention also includes an elliptic circular polarizing plate. It is also preferable to further laminate a λ/4 retardation film on the visual recognition side of the linear polarizer to make the emitted light circularly polarized, thereby improving the visual recognition when wearing polarized sunglasses. Generally, the materials of the retardation film are those whose birefringence is larger as the wavelength is shorter, and the birefringence is lower as the wavelength is longer. At this time, it is impossible to achieve a phase difference of λ/4 in the entire visible light region, so it is usually designed in the following way: for the vicinity of 560nm with high visual sensitivity, the in-plane phase difference becomes 100 to 180nm, preferably 130 to 150nm, so as to become λ/4. In general, it is preferable to use a reverse dispersion λ/4 retardation plate using a material having reverse birefringence wavelength dispersion characteristics because it can increase visibility. Such materials are preferably those described in JP-A-2007-232873 when the material is an elongated retardation plate, and those described in JP-A-2010-30979 when the material is a liquid crystal coating-type retardation plate.

Also, as another method, a technique of obtaining a broadband λ/4 retardation plate by combining a λ/2 retardation plate is known (Japanese Patent Application Laid-Open No. 10-90521). The λ/2 phase difference plate can also be manufactured with the same material and 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, but it is preferable to use the liquid crystal coating type phase difference plate for both because the film thickness can be made thinner.

In the above-mentioned circular polarizing plate, in order to improve visibility in oblique directions, a method of laminating a positive-C plate is known (Japanese Patent Application Laid-Open No. 2014-224837). The positive-C plate can be a liquid crystal coating type phase difference plate, or an extended type phase difference plate. The retardation in the thickness direction is -200 to -20nm, preferably -140 to -40nm.

[touch sensor]

A touch sensor is used as an input means. Various types of touch sensors have been proposed, such as a resistive film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, and a capacitive method, and any method may be used. Among them, the capacitive method is preferable. The capacitive touch sensor is divided into an active area and an inactive area located at the periphery of the aforementioned active area. The active area is the area corresponding to the display area (display part) of the display panel, which is the area to sense the user's touch, and the inactive area is the area corresponding to the area where the display device does not display the picture (non-display part). The touch sensor may include: a flexible substrate, a sensing pattern formed on the active area of the aforementioned substrate, and various sensing lines formed on the inactive area of the aforementioned substrate, and are used to connect with an external driving circuit through the sensing pattern and the pad portion. The flexible substrate can use the same material as the polymer film substrate of the front panel. In addition, since the substrate is peelable, only the touch sensor part can be transferred to the laminate and used.

(peel film)

The release film supports the adhesive layer and functions as a separator that can be peeled off from the adhesive layer. Examples of the release film include films in which the adhesive layer side surface of the support base film is subjected to release treatment such as silicone treatment. As the resin material for forming the base film, the same ones as those for the above-mentioned first base layer and second base layer forming resin materials are mentioned. The resin film may have a single-layer structure, or may be a multilayer resin film having a multi-layer structure of two or more layers.

(next layer)

The subsequent layer system can be formed by an adhesive, an adhesive, or a combination thereof, and is usually one layer, but may be two or more layers. When the next layer is composed of two or more layers, each layer may be formed of the same material or different materials.

The adhesive can be formed by combining one or more of water-based adhesives, active energy ray-curable adhesives, adhesives, and the like. Examples of water-based adhesives include polyvinyl alcohol-based resin aqueous solutions, water-based two-component urethane-based emulsion adhesives, and the like. Examples of active energy ray-curable adhesives include adhesives cured by irradiating active energy rays such as ultraviolet rays, adhesives containing a polymerizable compound and a photopolymerizable initiator, adhesives containing a photoreactive resin, and adhesives 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 urethane monomers, or oligomers derived from these monomers. Examples of the above-mentioned photopolymerization initiator include those containing active energy rays such as ultraviolet rays to generate active species, such as neutral radicals, anion radicals, and cationic radicals.

Adhesives include (meth)acrylic resins, styrene resins, polysiloxane resins, etc. as base polymers, and cross-linking agents such as isocyanate compounds, epoxy compounds, and aziridine compounds.

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

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

(Adhesive layer for optical film)

The adhesive layer for optical films can be formed with the said adhesive agent, an adhesive agent, and these combinations, Usually, it is 1 layer, However, 2 or more layers may be sufficient. When the optical film is composed of two or more adhesive layers, each layer may be formed of the same material or different materials. Examples of the adhesive and adhesive used to form the adhesive layer for an optical film are the same as those used for the above-mentioned adhesive layer. Surface treatment such as corona treatment, plasma treatment, flame treatment, etc. may be performed on the surface of the layer on which the adhesive layer for optical films is formed.

(Adhesive layer for laminate)

The adhesive layer for a laminate can be formed with the above-mentioned adhesive agent, an adhesive, and a combination thereof, and is usually one layer, but may be two or more layers. When the laminate is composed of two or more adhesive layers, each layer may be formed of the same material or different materials. Adhesives and adhesives used to form the adhesive for laminates include the same adhesives and adhesives as those used for the above-mentioned adhesive layer. Surface treatment such as corona treatment, plasma treatment, flame treatment, etc. may be performed on the surface of the layer on which the adhesive layer for laminate is formed.

Claims (13)

A laminate comprising sequentially a first base material layer, a first functional layer, an adhesive layer, a second functional layer, and a second base material layer, wherein the first functional layer and the second functional layer are respectively liquid crystal layers; in 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 from [a] to [c], and [a] is the same as the position of the end of the first base material layer, or located on the inner side of the end of the first base material layer in the width direction ; [b] located on the outer side in the width direction than the position of the end of the first functional layer; and [c] the same position as the end of the second functional layer, or located on the inner side in the width direction than the end of the second functional layer. The laminated body described in claim 1, wherein the positions of the ends of the adhesive layer at both ends of the laminated body in the width direction satisfy all of the above-mentioned relationships from [a] to [c]. The laminate as described in claim 1 or 2 of the patent claims, wherein at least one of the first functional layer and the second functional layer is a retardation layer. A laminate comprising a first substrate layer, a first functional layer, an adhesive layer, and a second functional layer in sequence, wherein the first functional layer and the second functional layer are respectively liquid crystal layers; in 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], [b], and [d], [a] at the same position as the end of the first base material layer, or at the inner side in the width direction of the end of the first base material layer; [b] at the outer side in the width direction of the end of the first functional layer; and [d] at the same position as the end of the second functional layer. The laminated body described in claim 4 of the patent application, wherein the positions of the ends of the adhesive layer at both ends of the laminated body in the width direction satisfy all the relationships in [a], [b], and [d] above. The laminate as described in claim 4 or 5 of the patent claims, wherein at least one of the first functional layer and the second functional layer is a retardation layer. The laminate described in claim 4 or 5 further includes a resin film, and the resin film is laminated on the side of the 2' functional layer via an adhesive layer for the resin film. The laminated body as described in claim 7 of the patent claims, wherein in at least one end portion of the laminated body in the width direction, 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 aforementioned first functional layer, or located on the inner side in the width direction than the position of the end portion of the aforementioned first functional layer. The laminated body as described in claim 7, wherein the aforementioned resin film is an optical film. A method for manufacturing a laminate, wherein the above-mentioned laminate system sequentially includes a first base material layer, a first functional layer, an adhesive layer, a second functional layer, and a second base material layer, and the method for manufacturing the above-mentioned laminate includes the following steps: a step of preparing a first build-up part, the first build-up part containing the first base material layer and the first functional layer; A step of preparing a second build-up part, the second build-up part containing the second base material layer and the second functional layer; and a step of laminating the first build-up part and the second build-up part so that the first functional layer and the second functional layer face each other through the adhesive layer; wherein the first functional layer and the second functional layer are respectively liquid crystal layers; at least one end of the laminate in the width direction, the position of the end of the adhesive layer satisfies the following [a] to [c] All relationships are: [a] at the same position as the end of the first base material layer, or at the inner side in the width direction from the end position of the first base material layer; [b] at the outer side in the width direction compared with the end position of the first functional layer; A method for manufacturing a laminate, wherein the above-mentioned laminate system sequentially includes a first substrate layer, a first functional layer, an adhesive layer, and a second functional layer. The method for manufacturing the above-mentioned laminate includes the following steps: a step of preparing a laminate as described in any one of items 1 to 3 of the scope of the patent application; and a step of peeling off the second substrate layer from the above-mentioned laminate. A method for manufacturing a laminate, comprising the following steps: a step of preparing a laminate as described in any one of claims 4 to 6 of the patent application; and a step of laminating a resin film on the side of the aforementioned 2' functional layer of the laminate via a resin film using an adhesive layer. A method for manufacturing a laminate comprising the following steps: A step of preparing a laminate as described in any one of items 7 to 9 of the patent claims; and a step of peeling off the aforementioned first substrate layer from the aforementioned laminate.

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