JP2019159200A - Method of manufacturing optical laminate and method of manufacturing optical laminate with adhesive layers - Google Patents

Abstract

To provide a method of manufacturing an optical laminate that is less susceptible to reverse curling, and a method of manufacturing an optical laminate with adhesive layers.SOLUTION: A method of manufacturing an optical laminate comprising an optical film, first cured adhesive layer, first liquid crystal layer, adhesive layer, and second liquid crystal layer laminated in the described order is provided, the method comprising steps of; stacking the optical film on the first liquid crystal side of the first liquid crystal layer with a base material layer, with the first cured adhesive layer in between, to obtain a first liquid crystal layer laminate with a base material layer; removing a first base material layer from the first liquid crystal layer laminate with a base material layer to obtain a first liquid crystal layer laminate; and stacking the first liquid crystal laminate and the second liquid crystal layer with a base material layer together such that a first exposed surface of the first liquid crystal layer laminate exposed by removing the first base material layer and the second liquid crystal layer face each other with the adhesive layer in between to obtain a second liquid crystal layer laminate. The adhesive layer may be a first adhesive layer or second cured adhesive layer.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for producing an optical laminate and a method for producing an optical laminate with an adhesive layer.

  Organic EL display devices using organic light-emitting diodes (OLEDs) are not only lighter and thinner than liquid crystal display devices, but also have high image quality such as a wide viewing angle, fast response speed, and high contrast. Since it can be realized, it is used in various fields such as smartphones, televisions, and digital cameras. In addition, since the organic EL display device is thin and can be displayed without using a backlight, a device shape that can be folded or wound has been proposed. In an organic EL display device, it is known to improve antireflection performance by using a circularly polarizing plate or the like in order to suppress a decrease in visibility due to reflection of external light.

  For example, Patent Documents 1 and 2 describe an optical film having an antireflection function as a film applied to an image display panel such as an organic EL display device, and the optical film is formed using a liquid crystal material. It has been described that it has a retardation layer.

Japanese Patent Laid-Open No. 2015-230386 JP-A-2015-79256

  Optical films such as those described above are required to be thinner and more bendable than in the past so as not to impair the lighter and thinner features of display devices. In addition, the optical film is used by being bonded to an optical display element. If the optical film is curled so that the side to be bonded to the optical display element is concave, the so-called reverse curl is generated. When an optical display element and an optical display element are bonded together, there is a tendency that defects such as air bubbles are mixed or wrinkles are recognized as unevenness. Since such a defect causes a defect of the image display panel, it is desired to suppress reverse curling of the optical film.

  An object of this invention is to provide the manufacturing method which can manufacture the optical laminated body by which reverse curl was suppressed, and the optical laminated body with an adhesion layer.

This invention provides the manufacturing method of the optical laminated body shown below, and the manufacturing method of the optical laminated body with an adhesion layer.
[1] A method for producing an optical laminate in which an optical film, a first adhesive cured layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer are laminated in this order,
The adhesive layer is a first adhesive layer or a second adhesive cured layer,
Preparing a first liquid crystal layer with a base material layer having a first base material layer and the first liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the first base material layer;
Preparing a second liquid crystal layer with a base material layer having a second base material layer and the second liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the second base material layer;
Laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with the base material layer through the first adhesive cured layer to obtain a first liquid crystal layer laminate with the base material layer;
Peeling the first base material layer from the first liquid crystal layer laminate with the base material layer to obtain a first liquid crystal layer laminate;
The first liquid crystal so that the first exposed surface side of the first liquid crystal layer laminate exposed by peeling the first base material layer and the second liquid crystal layer face each other with the adhesive layer interposed therebetween. Laminating the layer laminate and the second liquid crystal layer with the base material layer to obtain a second liquid crystal layer laminate, and a method for producing an optical laminate.
[2] The step of obtaining the first liquid crystal layer laminate with the base material layer includes:
1st adhesion | attachment containing the 1st adhesive composition for forming the said 1st adhesive agent cured layer in at least one by the said 1st liquid crystal layer side of the said optical film and the said 1st liquid crystal layer with a base material layer. Forming an agent composition layer;
After laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with the base material layer via the first adhesive composition layer, the first adhesive composition layer is cured to Forming the first adhesive cured layer, and the method for producing an optical laminate according to [1].
[3] The adhesive layer is the first adhesive layer,
The step of obtaining the second liquid crystal layer laminate includes
Forming the first adhesive layer on the first exposed surface of the first liquid crystal layer laminate to obtain a first liquid crystal layer laminate with an adhesive layer;
Bonding the first adhesive layer of the first liquid crystal layer laminate with the adhesive layer and the second liquid crystal layer of the second liquid crystal layer with the base material layer, [1] or [2 ] The manufacturing method of the optical laminated body of description.
[4] The step of obtaining the first liquid crystal layer laminate with an adhesive layer includes:
Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;
After bonding the first adhesive layer of the first adhesive layer with the release layer and the first exposed surface of the first liquid crystal layer laminate, peeling the first release layer. [3] The method for producing an optical laminate according to [3].
[5] The adhesive layer is the first adhesive layer,
The step of obtaining the second liquid crystal layer laminate includes
Forming the first adhesive layer on the second liquid crystal layer of the second liquid crystal layer with the base material layer to obtain a second liquid crystal layer with an adhesive layer;
The step of bonding the first adhesive layer of the second liquid crystal layer with the adhesive layer and the first exposed surface of the first liquid crystal layer laminate, according to [1] or [2]. Manufacturing method of optical laminated body.
[6] The step of obtaining the second liquid crystal layer with the adhesive layer includes:
Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;
A step of peeling the first release layer after bonding the first adhesive layer of the first adhesive layer with the release layer and the second liquid crystal layer of the second liquid crystal layer with the base material layer; The manufacturing method of the optical laminated body as described in [5] containing.
[7] The adhesive layer is the second adhesive cured layer,
The step of obtaining the second liquid crystal layer laminate includes
The second adhesive cured layer is formed on at least one of the first exposed surface side of the first liquid crystal layer laminate and the second liquid crystal layer side of the second liquid crystal layer with the base material layer. Forming a second adhesive composition layer comprising a second adhesive composition for
The first liquid crystal layer laminate and the second liquid crystal layer with the base material layer were laminated so that the first exposed surface and the second liquid crystal layer face each other through the second adhesive composition layer. Then, the process of hardening the said 2nd adhesive composition layer and forming the said 2nd adhesive hardening layer, The manufacturing method of the optical laminated body as described in [1] or [2].
[8] The method for producing an optical laminate according to any one of [1] to [7], wherein the optical film includes a polarizing plate.
[9] The method for producing an optical laminated body according to any one of [1] to [8], wherein the optical film includes a polarizing plate with a protective film in which a protective film is laminated on at least one side of the polarizing plate.
[10] The method for producing an optical laminate according to any one of [1] to [9], further comprising a step of peeling the second base material layer from the second liquid crystal layer laminate.
[11] A method for producing an optical laminate with an adhesive layer in which an optical film, a first adhesive cured layer, a first liquid crystal layer, an adhesive layer, a second liquid crystal layer, and a second adhesive layer are laminated in this order,
Preparing an optical laminate produced by the method for producing an optical laminate according to [10],
Laminating the second adhesive layer on the second exposed surface side of the optical laminate exposed by peeling off the second substrate layer, and a method for producing an optical laminate with an adhesive layer.
[12] The step of laminating the second adhesive layer includes:
Preparing a second adhesive layer with a release layer in which the second adhesive layer and the second release layer are laminated;
The step of laminating the second adhesive layer of the second adhesive layer with a release layer and the second exposed surface of the optical laminate, The optical laminate with an adhesive layer according to [11] Production method.

  ADVANTAGE OF THE INVENTION According to this invention, the optical laminated body by which reverse curl was suppressed, and the optical laminated body with an adhesion layer can be manufactured.

(A)-(d) is a schematic sectional drawing which shows typically an example of the manufacturing process of the optical laminated body of this invention. (A) And (b) is a schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG. (A) And (b) is a schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG. (A)-(c) is a schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG. (A)-(d) is a schematic sectional drawing which shows typically an example of the manufacturing process of the other optical laminated body of this invention. (A) And (b) is a schematic sectional drawing which shows typically an example of the manufacturing process of the optical laminated body with the adhesion layer of this invention. (A)-(e) is a schematic sectional drawing which shows typically an example of the manufacturing process of the optical laminated body different from this invention. (A)-(d) is a schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG.

  Hereinafter, preferred embodiments of the method for producing an optical laminate and the method for producing an optical laminate with an adhesive layer of the present invention will be described with reference to the drawings.

[Embodiment 1 (Method for Producing Optical Laminate)]
1 to 4 are schematic cross-sectional views schematically showing an example of the production process of the optical layered body of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 4C, the optical laminate 70x produced by the method for producing the optical laminate 70x of the present embodiment includes the optical film 60, the first adhesive cured layer 31, the first liquid crystal layer 12, and the first liquid crystal layer 12. One adhesive layer 32x (adhesive layer) and the second liquid crystal layer 22 are laminated in this order.

  The manufacturing method of the optical laminated body 70x includes a step of preparing the first liquid crystal layer 10 with the base material layer shown in FIG. 1A and the second liquid crystal layer 20 with the base material layer shown in FIG. . The first liquid crystal layer 10 with a base material layer has a first base material layer 11 and a first liquid crystal layer 12 formed by polymerizing a polymerizable liquid crystal compound on the first base material layer 11. The second liquid crystal layer 20 with a material layer has a second base material layer 21 and a second liquid crystal layer 22 formed by polymerizing a polymerizable liquid crystal compound on the second base material layer 21.

  The process of preparing the 1st liquid crystal layer 10 with a base material layer apply | coats and dries the composition for liquid crystal layer formation containing a polymeric liquid crystal compound on the 1st base material layer 11, and irradiates active energy rays, such as an ultraviolet-ray A step of forming a first liquid crystal layer 12 obtained by polymerizing and curing the polymerizable liquid crystal compound may be included. Similarly, in the step of preparing the second liquid crystal layer 20 with the base material layer, a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound is applied on the second base material layer 21 and dried to obtain an activity such as ultraviolet rays. A step of forming a second liquid crystal layer 22 obtained by polymerizing and curing the polymerizable liquid crystal compound by energy ray irradiation may be included.

  Next, the process of forming the 1st adhesive composition layer 31a containing the 1st adhesive composition for forming the 1st adhesive hardening layer 31 in the optical film 60 is performed. By this step, an optical film 61 with a composition layer can be obtained (FIG. 1C). As shown in FIG.1 (c), the optical film 61 with a composition layer laminates | stacks the optical film 60 and the 1st adhesive composition layer 31a. The step of forming the first adhesive composition layer 31 a may include a step of applying the first adhesive composition to the surface of the optical film 60.

  After laminating | stacking the 1st adhesive composition layer 31a of the obtained optical film 61 with a composition layer, and the 1st liquid crystal layer 12 of the 1st liquid crystal layer 10 with a base material layer (FIG.1 (d)), the 1st The 1st adhesive composition layer 31a is hardened | cured and the 1st liquid crystal layer laminated body 65 with a base material layer is obtained by forming the 1st adhesive hardening layer 31 (FIG. 2 (a)). The method of curing the first adhesive composition layer 31a can be appropriately selected according to the type of the first adhesive composition, etc. For example, active energy ray irradiation, heat treatment, addition of a curing agent, etc. Can be mentioned. The kind of 1st adhesive composition and its hardening method are mentioned later. As shown in FIG. 2A, the first liquid crystal layer laminate 65 with the base material layer includes the optical film 60, the first adhesive cured layer 31, the first liquid crystal layer 12, and the first base material layer 11. They are stacked in order. The 1st base material layer 11 is peeled from this 1st liquid crystal layer laminated body 65 with a base material layer, and the 1st liquid crystal layer laminated body 66 is obtained (FIG.2 (b)). As shown in FIG. 2B, the first liquid crystal layer laminate 66 is formed by laminating the optical film 60, the first adhesive cured layer 31, and the first liquid crystal layer 12 in this order.

  Then, the 1st adhesion layer 57 with the peeling layer in which the 1st adhesion layer 32x was formed on the 1st peeling layer 52 is prepared (FIG. 3 (a)). The step of preparing the first pressure-sensitive adhesive layer 57 with the pressure-sensitive adhesive layer may include a step of forming the first pressure-sensitive adhesive layer 32x on the first release layer 52 by applying and drying the pressure-sensitive adhesive composition. Moreover, you may provide the process of coat | covering the surface on the opposite side to the 1st peeling layer 52 of the 1st adhesion layer 32x with another peeling layer as needed. The first pressure-sensitive adhesive layer 32x of the prepared first pressure-sensitive adhesive layer 57 with the release layer and the first liquid crystal layer 12 (first exposed surface) of the first liquid crystal layer laminate 66 exposed by peeling the first base material layer 11 are used. Then, the first release layer 52 is peeled off to obtain a first liquid crystal layer laminate 67 with an adhesive layer (FIG. 4 (a)). As shown in FIG. 4A, the first liquid crystal layer laminate 67 with the adhesive layer is formed by laminating the optical film 60, the first adhesive cured layer 31, the first liquid crystal layer 12, and the first adhesive layer 32x in this order. It has been done.

  The first adhesive layer 32x of the first liquid crystal layer laminate 67 with the adhesive layer shown in FIG. 4A and the second liquid crystal layer 22 of the second liquid crystal layer 20 with the base material layer shown in FIG. In combination, a second liquid crystal layer laminate 71x (optical laminate) shown in FIG. 4B is obtained. As shown in FIG. 4B, the second liquid crystal layer laminate 71x includes an optical film 60, a first adhesive cured layer 31, a first liquid crystal layer 12, a first adhesive layer 32x, a second liquid crystal layer 22, Two base material layers 21 are laminated in this order. By peeling the second base material layer 21 from the obtained second liquid crystal layer laminate 71x, an optical laminate 70x can be obtained (FIG. 4C).

  In the manufacturing method of the optical laminated body 70x described above, a polymerizable compound is polymerized on the first base material layer 11 and the second base material layer 21 (hereinafter, both may be collectively referred to as “base material layer”). The first liquid crystal layer 10 with a base material layer and the second liquid crystal layer 20 with a base material layer (hereinafter, both may be collectively referred to as “liquid crystal layer with a base material layer”) are used. In a liquid crystal layer with a base material layer, a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound is usually applied onto the base material layer and dried, and the polymerizable liquid crystal compound is polymerized by irradiation with active energy rays such as ultraviolet rays. Thus, the first liquid crystal layer 12 and the second liquid crystal layer 22 (hereinafter, both may be collectively referred to as “liquid crystal layer”) may be formed. The liquid crystal layer formed through the above-described steps of coating, drying, polymerization, curing and the like has a shrinkage stress generated during drying of the applied composition for forming a liquid crystal layer and curing due to polymerization of the polymerizable liquid crystal compound. Presumed to remain. In the state of the liquid crystal layer with the base material layer where the liquid crystal layer is present on the base material layer, the shrinkage stress is suppressed by the base material layer. As described above, the base material layer is the optical laminate 70x. It is considered that the contraction stress of the liquid crystal layer is released by the peeling of the base material layer. At this time, if the liquid crystal layer is bonded to the optical film, the laminate of the optical film and the liquid crystal layer becomes a bow with the liquid crystal layer side as the inner side due to the shrinkage stress released by peeling the base material layer. Deformation (hereinafter sometimes referred to as “reverse curling”) may occur.

  Such curling is considered to occur easily when the optical film 60 and the liquid crystal layer are laminated, using an adhesive layer that is less rigid and easily deformed than the adhesive-cured layer. For example, as shown in FIGS. 7 and 8, when an optical laminate is manufactured by sequentially laminating a liquid crystal layer on an optical film via an adhesive layer, the liquid crystal released by peeling the base material layer is released. It is presumed that the adhesive layer and the optical film are easily deformed under the influence of the shrinkage stress of the layer, and reverse curl is likely to occur in the optical laminate. 7 and 8 are schematic cross-sectional views schematically showing an example of the manufacturing process of the optical laminate different from the manufacturing process of the optical laminate shown in FIGS.

  In the manufacturing method of the optical laminated body 70p shown in FIG. 8D, first, the first ′ adhesive layer 31p of the optical film 61p with the adhesive layer obtained by laminating the optical film 60p and the first ′ adhesive layer 31p (FIG. 7A )), The first liquid crystal layer of the first liquid crystal layer 10p with the base material layer (FIG. 7B) having the first liquid crystal layer 12p formed by polymerizing the polymerizable liquid crystal compound on the first base material layer 11p. The 12p side is bonded (FIG. 7 (c)). Thereafter, the first base material layer 11p is peeled off (FIG. 7D), and the first liquid crystal layer 12p exposed by the peeling and the second ′ adhesive layer 32p formed on the second peeling layer 52p are pasted. In combination (FIG. 7E), the second peeling layer 52p is peeled off (FIG. 8A). Next, the second liquid crystal layer 20p of the second liquid crystal layer 20p with the base material layer having the second liquid crystal layer 22p formed by polymerizing the polymerizable liquid crystal compound on the second base material layer 21p (FIG. 8B). The side is bonded to the second ′ adhesive layer 32p to obtain an optical laminate 71p with a base material layer (FIG. 8C). The 2nd base material layer 21p is peeled from this optical laminated body 71p with a base material layer, and the optical laminated body 70p (FIG.8 (d)) is obtained.

  As described above, in the manufacturing process shown in FIGS. 7 and 8, the first liquid crystal layer 12p is laminated on the optical film 60p through the first ′ adhesive layer 31p, and then the first base material layer 11p is peeled off to form the first liquid crystal layer. After laminating the second liquid crystal layer 22p on the 12p via the second 'adhesive layer 32p, the second base material layer 21p is peeled off. Therefore, it is presumed that the contraction stress of the first liquid crystal layer 12p and the second liquid crystal layer 22p is released in each step of peeling the first base material layer 11p and the second base material layer 21p. Under the influence of the released shrinkage stress, the first 'adhesive layer 31p, the second' adhesive layer 32p, and the optical film 60p are likely to be deformed, and reverse curl is likely to occur in the optical laminate 70p.

  On the other hand, in the manufacturing method of the optical laminated body 70 x of the present embodiment shown in FIGS. 1 to 4, the optical film 60 and the first liquid crystal layer 12 are laminated via the first adhesive cured layer 31. The first adhesive cured layer 31 has higher rigidity and is less likely to be deformed than the first 'adhesive layer 31p. Therefore, even if the 1st base material layer 11 is peeled from the 1st liquid crystal layer laminated body 65 with a base material layer shown to Fig.2 (a), the shrinkage stress of the 1st liquid crystal layer 12 by the 1st adhesive hardening layer 31 It is presumed that it is easy to keep the state suppressed. Therefore, in the manufacturing method of the optical laminated body 70x shown in FIGS. 1 to 4, the reverse curl generated in the optical laminated body 70x is compared with the optical laminated body 70p obtained in the manufacturing process shown in FIGS. Can be reduced. When an optical layered body with an adhesive layer (described later) obtained by using the optical layered body 70x is bonded to an optical display element by reducing the reverse curl generated in the optical layered body 70x, an optical layer with an adhesive layer is used. It is possible to suppress problems such as air bubbles mixed in between the laminate and the optical display element, wrinkles, or bonding errors.

  It is considered that the reverse curl generated in the optical laminate is more susceptible to the release of contraction stress by the liquid crystal layer as the thickness and rigidity of the optical film 60 included in the optical laminate are smaller. Moreover, since the shrinkage stress remaining in the liquid crystal layer increases as the thickness or rigidity of the base material layer increases, it is considered that the base material layer is easily affected by the shrinkage stress released when the base material layer is peeled off. Therefore, the manufacturing method of the optical laminated body of this embodiment is suitable when the thickness of the optical film 60 is 2 micrometers or more and 500 micrometers or less. The optical film 60 may have a thickness of 10 μm or more, 350 μm or less, 200 μm or less, or 150 μm or less.

  In addition, the first liquid crystal layer 10 with a base material layer, the second liquid crystal layer 20 with a base material layer, the first adhesive layer 57 with a release layer, the optical film 60, which are used for manufacturing an optical laminate in the present embodiment, The film-like material such as the optical film 61 with the composition layer is preferably a long film-like material, and it is preferable to perform each step while continuously conveying these. The width direction W is a direction orthogonal to the length direction of the film-like object.

  The manufacturing method of the optical laminated body of this embodiment may be changed like the modification shown below. Moreover, you may combine arbitrarily above-described embodiment and the modification shown below.

(Modification 1 of Embodiment 1)
In the above, the optical film 60 is provided with the first adhesive composition layer 31a to obtain the optical film 61 with the composition layer, and the base material is formed on the first adhesive composition layer 31a of the optical film 61 with the composition layer. The case of laminating the first liquid crystal layer 12 of the first liquid crystal layer 10 with a layer has been described as an example. However, the first liquid crystal layer 10 with a base material layer 10 is provided via the first adhesive composition layer 31a. If the optical film 60 is laminated | stacked on the liquid crystal layer 12 side and the 1st liquid crystal layer laminated body 65 with a base material layer shown to Fig.2 (a) can be obtained, it will not be limited to this. For example, after providing the 1st adhesive composition layer 31a in the 1st liquid crystal layer 12 side of the 1st liquid crystal layer 10 with a base material layer, laminating | stacking the optical film 60 on this 1st adhesive composition layer 31a, The 1st adhesive composition layer 31a may be hardened and the 1st adhesive hardening layer 31 may be formed.

(Modification 2 of Embodiment 1)
In the above description, the first adhesive layer 32x is provided on the first liquid crystal layer 12 of the first liquid crystal layer laminate 66 using the first adhesive layer 57 with the release layer shown in FIG. Although the case where the second liquid crystal layer 22 of the second liquid crystal layer 20 with the base material layer is laminated on 32x is described as an example, the first liquid crystal layer 12 of the first liquid crystal layer laminate 66 and the base material layer are provided. If the 2nd liquid crystal layer 22 of the 2nd liquid crystal layer 20 can be laminated via the 1st adhesion layer 32x, it will not be limited to this. For example, the first adhesive layer 32x is provided on the second liquid crystal layer 22 side of the second liquid crystal layer 20 with the base layer using the second adhesive layer 57 with the release layer shown in FIG. The layer 32x and the first liquid crystal layer 12 of the first liquid crystal layer stack 66 may be bonded together.

[Embodiment 2 (Method for Manufacturing Optical Laminate)]
FIGS. 5A to 5D are schematic cross-sectional views schematically showing an example of the manufacturing process of the optical layered body of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 5D, the optical laminate 70y produced by the method for producing the optical laminate 70y of this embodiment includes an optical film 60, a first adhesive cured layer 31, a first liquid crystal layer 12, and a first liquid crystal layer 12. The two adhesive cured layers 32y (adhesive layer) and the second liquid crystal layer 22 are laminated in this order. In addition, below, the same code | symbol is attached | subjected about the same member as the member demonstrated in previous embodiment, and the description is abbreviate | omitted.

  In the manufacturing method of the optical layered body 70y, the first liquid crystal layer 10 with the base material layer shown in FIG. 1A and the base material layer shown in FIG. A step of preparing the attached second liquid crystal layer 20. Moreover, the process which forms the 1st adhesive composition layer 31a containing the 1st adhesive composition for forming the 1st adhesive hardening layer 31 in the optical film 60 is performed, The composition shown in FIG.1 (c). The optical film 61 with a physical layer is obtained. After obtaining the 1st liquid crystal layer laminated body 65 with a base material layer shown to Fig.2 (a) using the optical film 61 with a composition layer, and the 1st liquid crystal layer 10 with a base material layer, it is the 1st base material. The layer 11 is peeled off to obtain the first liquid crystal layer stack 66 (FIG. 2B). Step of preparing first liquid crystal layer 10 with base layer and second liquid crystal layer 20 with base layer, optical film 61 with composition layer, first liquid crystal layer stack 65 with base layer, and first liquid crystal layer stack About the process of obtaining the body 66, since it is as having demonstrated in previous embodiment, the description is abbreviate | omitted.

  Next, the second adhesive composition layer 32a containing an adhesive composition for forming the second adhesive cured layer 32y is formed on the surface of the second liquid crystal layer 20 with the base material layer on the second liquid crystal layer 22 side. A process of forming is performed. By this step, the second liquid crystal layer 25 with the composition layer can be obtained (FIG. 5A). As shown in FIG. 5A, the second liquid crystal layer 25 with the composition layer is formed by laminating the second adhesive composition layer 32a, the second liquid crystal layer 22, and the second base material layer 21 in this order. It is. The process of forming the 2nd adhesive composition layer 32a may include the process of apply | coating an adhesive composition to the surface at the side of the 2nd liquid crystal layer 22 of the 2nd liquid crystal layer 20 with a base material layer.

  After laminating the second adhesive composition layer 32a of the obtained second liquid crystal layer 25 with the composition layer and the first liquid crystal layer 12 of the first liquid crystal layer stack 66 (FIG. 5B), the second The second adhesive composition layer 32a is cured to form the second adhesive cured layer 32y to obtain the second liquid crystal layer laminate 71y (FIG. 5C). The method of curing the second adhesive composition layer 32a can be appropriately selected according to the type of the second adhesive composition, etc. For example, active energy ray irradiation, heat treatment, addition of a curing agent, etc. Can be mentioned. The kind of 2nd adhesive composition and its hardening method are mentioned later. As shown in FIG. 5C, the second liquid crystal layer laminate 71y includes an optical film 60, a first adhesive cured layer 31, a first liquid crystal layer 12, a second adhesive cured layer 32y, and a second liquid crystal layer 22. , And the second base material layer 21 are laminated in this order. By peeling the second base material layer 21 from the obtained second liquid crystal layer laminate 71y, an optical laminate 70y can be obtained (FIG. 5 (d)).

  In the manufacturing method of the optical layered body 70y described above, as in the previous embodiment, the first base material layer 11 and the second base material layer 21 (hereinafter, both may be collectively referred to as “base material layer”). The 1st liquid crystal layer 10 with a base material layer and the 2nd liquid crystal layer 20 with a base material layer which superposed | polymerized and hardened | cured the polymeric compound above (Hereafter, both may be collectively called a "liquid crystal layer with a base material layer."). ) Is used. Therefore, as described in the previous embodiment, in the laminate of the optical film and the liquid crystal layer, reverse curl that warps in a bow shape with the liquid crystal layer side inside may occur due to the peeling of the base material layer.

  In the optical laminated body 70y of the present embodiment, the optical film 60 and the first liquid crystal layer 12 are laminated via the first adhesive cured layer 31, and the first liquid crystal layer 12 and the second liquid crystal layer 22 are formed. The second adhesive cured layer 32 is laminated. The first adhesive cured layer 31 and the second adhesive cured layer 32 are compared with the first ′ adhesive layer 31p and the second ′ adhesive layer 32p of the optical laminate 70p obtained in the manufacturing process shown in FIGS. Then, rigidity is high and it is hard to deform | transform. Therefore, the 1st base material layer 11 is peeled from the 1st liquid crystal layer laminated body 65 with a base material layer shown to Fig.2 (a), and the 2nd base material from the 2nd liquid crystal layer laminated body 71y shown in FIG.5 (c). Even if the layer 21 is peeled off, it is assumed that the first adhesive cured layer 31 and the second adhesive cured layer 32 are likely to keep the contraction stress of the first liquid crystal layer 12 and the second liquid crystal layer 22 in a suppressed state. . Therefore, in the manufacturing method of the optical laminated body 70y of this embodiment, the reverse curl generated in the optical laminated body 70y is reduced as compared with the optical laminated body 70p obtained in the manufacturing process shown in FIGS. It is considered possible. By reducing the reverse curl generated in the optical layered body 70y, the optical layered body with an adhesive layer (described later) obtained by using the optical layered body 70y is bonded to the optical display element. It is possible to suppress problems such as air bubbles mixed in between the laminate and the optical display element, wrinkles, and bonding errors.

  In addition, the 1st liquid crystal layer 10 with a base material layer, the 2nd liquid crystal layer 20 with a base material layer, the 2nd liquid crystal layer 25 with a composition layer, and the optical film 60 used in order to manufacture an optical laminated body in this embodiment. The film-like material such as the optical film 61 with the composition layer is preferably a long film-like material, and it is preferable to perform each step while continuously conveying these. The width direction W is a direction orthogonal to the length direction of the film-like object.

(Modification 1 of Embodiment 2)
As described in the previous embodiment, instead of providing the first adhesive composition layer 31a on the optical film 60, the first liquid crystal layer 12 with the base material layer 10 is bonded to the first liquid crystal layer 12 side. An agent composition layer 31a may be provided. In this case, after laminating the optical film 60 on the first adhesive composition layer 31a having a diameter on the first liquid crystal layer 12 side of the first liquid crystal layer 10 with the base material layer, the first adhesive composition layer 31a is formed. The first adhesive cured layer 31 may be formed by curing.

(Modification 2 of Embodiment 2)
In the above, the 2nd adhesive composition layer 32a is provided in the 2nd liquid crystal layer 22 side of the 2nd liquid crystal layer 20 with a base material layer, and the 2nd liquid crystal layer 25 with a composition layer is obtained, and this 2nd with composition layer Although the case where the 2nd adhesive composition layer 32a of the liquid crystal layer 25 and the 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 were laminated | stacked was mentioned as an example, the 2nd liquid crystal layer 20 with a base material layer was demonstrated. The second liquid crystal layer laminate 71y (FIG. 5C) in which the second liquid crystal layer 22 and the first liquid crystal layer 12 of the first liquid crystal layer laminate 66 are laminated via the second adhesive cured layer 32. If it can obtain, it will not be limited to this. For example, the second adhesive composition layer 32a is provided on the first liquid crystal layer stack 66 on the first liquid crystal layer 12 side, and the second adhesive composition layer 32a and the second liquid crystal layer 20 with the base material layer 20 are provided. After laminating the two liquid crystal layers 22, the second adhesive composition layer 32a may be cured to form the second adhesive cured layer 32y. In addition, the second adhesive composition layer 32a is formed on both the first liquid crystal layer 12 side of the first liquid crystal layer stack 66 and the second liquid crystal layer 22 side of the second liquid crystal layer 20 with the base material layer. It may be.

[Embodiment 3 (Method for producing optical laminate with adhesive layer)]
6A and 6B are schematic cross-sectional views schematically showing an example of a manufacturing process of the optical layered body with an adhesive layer of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 5 (b), the optical layered body 80 with the adhesive layer manufactured by the method for manufacturing the optical layered body 80 with the adhesive layer of the present embodiment includes the optical film 60, the first adhesive cured layer 31, the first layer. The first liquid crystal layer 12, the adhesive layer 32, the second liquid crystal layer 22, and the second adhesive layer 33 are laminated in this order. A second peeling layer 53 may be provided on the opposite side of the second adhesive layer 33 from the second liquid crystal layer 22. The adhesive layer 32 is the first adhesive layer 32x or the second adhesive cured layer 32y.

  The manufacturing method of the optical laminated body 80 with the adhesion layer may be referred to as an optical laminated body 70x shown in FIG. 4C or an optical laminated body 70y shown in FIG. 5D (hereinafter, both are referred to as “optical laminated body 70”). .) And a step of preparing a second adhesive layer 58 with a release layer in which the second release layer 53 and the second adhesive layer 33 are laminated, as shown in FIG. 6 (a). The step of preparing the second pressure-sensitive adhesive layer 58 with the release layer may include a step of forming the second pressure-sensitive adhesive layer 33 on the second release layer 53 by applying and drying the pressure-sensitive adhesive composition. Moreover, you may provide the process of coat | covering the surface on the opposite side to the 2nd peeling layer 53 of the 2nd adhesion layer 33 with another peeling layer as needed.

  The prepared second adhesive layer 33 of the second adhesive layer with release layer 58 and the second liquid crystal layer 22 (second exposed surface) of the optical laminate 70 exposed by peeling the second base material layer 21 are pasted. Together, an optical layered body 80 with an adhesive layer is obtained (FIG. 6B). The optical layered body with an adhesive layer 80 obtained at this time has a second release layer 53. When laminating the optical layered body 80 with the adhesive layer on the optical display element, the second release layer 53 is peeled off, and the second adhesive layer 33 and the optical display element are bonded to form an image display panel. Can do.

  The optical layered body 80 with the adhesive layer can be used by bonding the second adhesive layer 33 to the optical display element. In the manufacturing method of the optical layered body 80 with the adhesive layer described above, since the optical layered body 70 in which the reverse curl described in the previous embodiment is suppressed is used, the second adhesive layer 33 of the optical layered body 80 with the adhesive layer is used. So-called reverse curling that curls so that the side is concave can be suppressed. Thereby, when bonding the optical laminated body 80 with an adhesion layer to an optical display element, it is possible to suppress problems such as bubbles being mixed between the optical laminated body and the optical display element, or a bonding error occurring. it can.

  In addition, film-like objects, such as the optical laminated body 70 and the 2nd adhesion layer 58 with a peeling layer, used in order to manufacture the optical laminated body with an adhesion layer in this embodiment are elongate film-like objects. It is preferable to perform each step while continuously transporting them. The width direction W is a direction orthogonal to the length direction of the film-like object.

  As mentioned above, although embodiment of this invention and its modification were demonstrated, this invention is not limited to these embodiment and its modification, For example, combining each process of the said embodiment and its modification. It can also be implemented. Hereafter, each process common in all embodiment and its modification is demonstrated in detail.

(Optical film)
An optical film is a polarizer, a polarizing plate having a protective layer formed on at least one side of the polarizer, 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 transflective reflective film, and a luminance. It can be an improvement film, an optical compensation film, a film with an antiglare function, or the like. The optical film may have a single-layer structure or a laminated optical film having a multilayer structure of two or more layers. In this specification, the “polarizer” 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.

(Polarizer)
Any appropriate polarizer can be adopted as the polarizer. In this specification, the “polarizer” refers to a linear polarizer having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when non-polarized light is incident. For example, the resin film forming the polarizer may be a single-layer resin film or a laminated film of two or more layers. The polarizer may be a cured film obtained by aligning a dichroic dye on a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound.

  Specific examples of a polarizer composed of a single-layer resin film include polyvinyl alcohol (hereinafter sometimes abbreviated as “PVA”) film, partially formalized PVA film, and ethylene / vinyl acetate copolymer. A hydrophilic polymer film such as a systematic partially saponified film, which has been subjected to a dyeing process and a stretching process with a dichroic substance such as iodine or a dichroic dye, and a PVA dehydrated product or polyvinyl chloride removed. Examples include polyene-based oriented films such as treated with hydrochloric acid. From the viewpoint of excellent optical properties, it is preferable to use a polarizer obtained by uniaxially stretching a PVA film with iodine.

  The polyvinyl alcohol-based resin can be produced by saponifying a polyvinyl acetate-based resin. The polyvinyl acetate resin may be a copolymer of vinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer copolymerizable with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

  The saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can be used. The degree of polymerization of the polyvinyl alcohol resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

  What formed such a polyvinyl alcohol-type resin into a film is used as a raw film of a polarizer. The method for forming a polyvinyl alcohol-based resin is not particularly limited, and can be formed by a known method. The film thickness of the polyvinyl alcohol resin raw film is, for example, about 10 to 100 μm, preferably about 10 to 60 μm, and more preferably about 15 to 30 μm.

  As another method for producing a polarizer, first, a base film is prepared, a solution of a resin such as a polyvinyl alcohol resin is applied on the base film, and drying is performed to remove the solvent. The thing including the process of forming a resin layer can be mentioned. A primer layer can be formed in advance on the surface of the base film on which the resin layer is formed. As the base film, a resin film such as PET can be used. Examples of the material for the primer layer include a resin obtained by crosslinking a hydrophilic resin used for a polarizer.

  Next, if necessary, the amount of solvent such as moisture in the resin layer is adjusted, then the base film and the resin layer are uniaxially stretched, and then the resin layer is dyed with a dichroic dye such as iodine to obtain two colors. The adsorptive dye is adsorbed and oriented on the resin layer. Subsequently, if necessary, the resin layer on which the dichroic dye is adsorbed and oriented is treated with an aqueous boric acid solution, and a washing step of washing off the aqueous boric acid solution is performed. Thus, a resin layer in which the dichroic dye is adsorbed and oriented, that is, a polarizer film is manufactured. A known method can be adopted for each step.

  Uniaxial stretching of the base film and the resin layer may be performed before dyeing, may be performed during dyeing, or may be performed during boric acid treatment after dyeing. Stretching may be performed. The base film and the resin layer may be uniaxially stretched in the MD direction (film transport direction). In this case, the base film and the resin layer may be uniaxially stretched between rolls having different peripheral speeds, or uniaxially stretched using a hot roll. May be. Further, the base film and the resin layer may be uniaxially stretched in the TD direction (direction perpendicular to the film transport direction), and in this case, a so-called tenter method can be used. The stretching of the base film and the resin layer may be dry stretching in which stretching is performed in the air, or may be wet stretching in which stretching is performed in a state where the resin layer is swollen with a solvent. In order to express the performance of the polarizer, the draw ratio is 4 times or more, preferably 5 times or more, and particularly preferably 5.5 times or more. The upper limit of the draw ratio is not particularly limited, but is preferably 8 times or less from the viewpoint of suppressing breakage and the like.

  The polarizer produced by the above method can be obtained by peeling the base film after laminating a protective layer described later. According to this method, it is possible to further reduce the thickness of the polarizer.

  A method for producing a polarizer, which is a cured film obtained by aligning a dichroic dye on a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound, includes a polymerizable liquid crystal compound and a dichroic dye on a base film. A method of forming a polarizer by applying a composition for forming a polarizer and polymerizing and curing a polymerizable liquid crystal compound while maintaining a liquid crystal state can be mentioned. Thus, the obtained polarizer exists in the state laminated | stacked on the base film, and you may use a polarizer with a base film as an optical film. Or after laminating | stacking the polarizer with a base film, and a liquid crystal layer laminated body through a 1st adhesive agent cured layer, a base film may be peeled and a polarizer may be used as an optical film.

  As the dichroic dye, a dye having the property that the absorbance in the major axis direction and the absorbance in the minor axis direction of the molecule are different can be used, for example, a dye having an absorption maximum wavelength (λmax) in the range of 300 to 700 nm. Is preferred. Examples of such dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes, and among them, azo dyes are preferable. Examples of the azo dye include a monoazo dye, a bisazo dye, a trisazo dye, a tetrakisazo dye, and a stilbene azo dye, and a bisazo dye and a trisazo dye are more preferable.

  The composition for forming a polarizer can contain a solvent, a polymerization initiator such as a photopolymerization initiator, a photosensitizer, and a polymerization inhibitor. As the polymerizable liquid crystal compound, dichroic dye, solvent, polymerization initiator, photosensitizer, polymerization inhibitor and the like contained in the composition for forming a polarizer, known ones can be used. Those exemplified in Japanese Unexamined Patent Publication No. 2017-102479 and Japanese Unexamined Patent Application Publication No. 2017-83843 can be used. Moreover, as the polymerizable liquid crystal compound, the same compounds as those exemplified as the polymerizable liquid crystal compound used for obtaining the first liquid crystal layer and the second liquid crystal layer described later may be used. The method exemplified in the above publication can also be adopted as a method of forming a polarizer using the composition for forming a polarizer.

  The thickness of the polarizer is preferably 2 μm or more, and more preferably 3 μm or more. The thickness of the polarizer is 25 μm or less, preferably 15 μm or less, more preferably 13 μm or less, and further preferably 7 μm or less. In addition, the upper limit value and lower limit value mentioned above can be combined arbitrarily. As the thickness of the polarizer is reduced, the rigidity is reduced, and the rigidity is easily affected by the contraction stress of the first liquid crystal layer and the second liquid crystal layer. The manufacturing method of a laminated body and the manufacturing method of an optical laminated body with an adhesion layer can be used conveniently.

(Polarizer)
The polarizer can be formed as a polarizing plate by laminating a protective layer on one or both sides thereof via a known adhesive layer or adhesive layer. This polarizing plate is a so-called linear polarizing plate. The protective layer that can be laminated on one or both sides of the polarizer is, for example, formed from a thermoplastic resin that is excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, isotropic properties, stretchability, etc. A film is used. Specific examples of such thermoplastic resins include: cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamides such as nylon and aromatic polyamide Resin; Polyimide resin; Polyolefin resin such as polyethylene, polypropylene, and ethylene / propylene copolymer; Cyclic polyolefin resin having cyclo and norbornene structures (also referred to as norbornene resin); (Meth) acrylic resin; Polyarylate resin; Polystyrene resin A polyvinyl alcohol resin, and mixtures thereof. When protective layers are laminated on both sides of the polarizer, the resin compositions of the two protective layers may be the same or different. The manufacturing method of the optical laminated body of the said embodiment and the manufacturing method of the optical laminated body with an adhesion layer are also used when the polarizing plate by which the protective layer was laminated | stacked only on the single side | surface of the polarizer was used as an optical film from a viewpoint of thickness reduction. This is preferable because reverse curl can be suppressed. In the present specification, “(meth) acryl” means that either acryl or methacryl may be used. “(Meth)” such as (meth) acrylate has the same meaning.

  The film formed from the thermoplastic resin may be subjected to a surface treatment (for example, a corona treatment) in order to improve adhesion with a polarizer made of a PVA resin and a dichroic material, and a primer layer. A thin layer such as (also referred to as an undercoat layer) may be formed.

The protective layer preferably has a moisture permeability of 1 to 1500 g / m ² · 24 hr at a temperature of 40 ° C. and a humidity of 90% RH. When the moisture permeability of the protective layer exceeds 1500 g / m ² · 24 hr, the curl change with time of the polarizing plate may easily occur in a high temperature and high humidity environment. The lower the moisture permeability of the protective layer, the easier it is to obtain the effect of suppressing the change in curling of the polarizing plate over time. The moisture permeability of the protective layer at a temperature of 40 ° C. and a humidity of 90% RH is more preferably 1000 g / m ² · 24 hr or less, further preferably 100 g / m ² · 24 hr or less, and more preferably 10 g / m ² · More preferably, it is 24 hours or less. The moisture permeability can be measured according to JIS Z 0208: 1976.

When the protective layers are laminated on both surfaces of the polarizer, the moisture permeability of the outer protective layer laminated on the viewing side when the optical laminate or the optical laminate with the adhesive layer is bonded to the optical display element, The moisture permeability of the inner protective layer laminated on the first adhesive layer side is preferably the same as each other, or the outer protective layer is preferably smaller than the inner protective layer. This makes it possible to keep the polarizing plate curled to the positive curl side by maintaining a flat shape or when the inner protective layer swells, especially when moisture is added during storage of the polarizing plate. The optical laminate or the optical laminate with the adhesive layer is easily curled to the positive curl side. The moisture permeability of the outer protective layer is more preferably 10 g / m ² · 24 hr or less. Thereby, even a polarizing plate in which a protective layer is laminated only on one side of a polarizer, curl control is possible, and after an optical laminate or an optical laminate with an adhesive layer is bonded to an optical display element, Dimensional change (deformation) over time can be suppressed.

  Furthermore, in order to further reduce the influence of the shrinkage stress of the first liquid crystal layer and the second liquid crystal layer and suppress the positive curl generated in the optical laminate or the optical laminate with the adhesive layer, a polarizing plate used as an optical film In the above, it is preferable to increase the rigidity of the protective layer laminated on the polarizer. Here, the rigidity is defined as the film thickness multiplied by the tensile elastic modulus (hereinafter sometimes referred to as “23 ° C. elastic modulus”) of the film used for the protective layer at room temperature (23 ° C.). . For example, the protective layer using a cellulose polymer typified by triacetylcellulose preferably has an elastic modulus at 23 ° C. in the range of 3000 to 5000 MPa, and the protective layer using an acrylic polymer typified by polymethyl methacrylate. Preferably has a 23 ° C. elastic modulus in the range of 2000 to 4000 MPa, and the protective layer using a cycloolefin polymer having a norbornene structure preferably has a 23 ° C. elastic modulus in the range of 2000 to 4000 MPa. . For the outer protective layer, an acrylic polymer or a polyolefin polymer is suitably used from the viewpoint of moisture permeability and rigidity, and a cycloolefin polymer is particularly preferably used.

  The protective layer may be, for example, one obtained by stretching the thermoplastic resin described above, or may be one that has not been stretched (hereinafter, sometimes referred to as “unstretched resin”). Examples of the stretching treatment include uniaxial stretching and biaxial stretching.

  The stretching direction in the stretching treatment may be the length direction of the unstretched resin, may be a direction orthogonal to the length direction, or may be a direction oblique to the length direction. In the case of uniaxial stretching, the unstretched resin may be stretched in any one of these directions. The biaxial stretching may be simultaneous biaxial stretching that simultaneously stretches in two of these directions, or may be sequential biaxial stretching that stretches in another direction after stretching in a predetermined direction.

  In the stretching process, for example, two or more pairs of nip rolls with increased peripheral speeds on the downstream side are used to stretch in the length direction, or both ends of unstretched resin are gripped with a chuck and perpendicular to the length direction. It can be performed by stretching in the direction. At this time, it is possible to control the desired retardation value and wavelength dispersion by adjusting the thickness of the thermoplastic resin after stretching or adjusting the stretching ratio.

The stretched thermoplastic resin preferably satisfies the following formula.
(1) 80 nm ≦ Re (590) ≦ 180 nm
(2) 0.5 <Rth (590) / Re (590) ≦ 0.8
(3) 0.85 ≦ Re (450) / Re (550) <1.00
In the formula, Re (590), Re (450), and Re (550) represent in-plane retardation values at measurement wavelengths of 590 nm, 450 nm, and 550 nm, respectively, and Rth (590) represents a thickness direction retardation at a measurement wavelength of 590 nm. Represents a value. These in-plane retardation value and thickness direction retardation value are values measured in an environment of a temperature of 23 ° C. and a relative humidity of 55%.

  The in-plane retardation value Re and the thickness direction retardation value Rth are the refractive index in the in-plane slow axis direction nx, and the in-plane fast axis direction (direction perpendicular to the in-plane slow axis direction) is ny. When the refractive index in the thickness direction is nz and the thickness of the stretched thermoplastic resin is d, it is defined by the following formulas (S1) and (S2).

(S1) Re = (nx−ny) × d
(S2) Rth = [{(nx + ny) / 2} -nz] × d

  The outer protective layer described above is preferably a stretched thermoplastic resin that satisfies the above formulas (1) to (3). The outer protective layer is preferably bonded to the polarizer so as to have a slow axis in a direction oblique to the absorption axis of the polarizer. For example, the angle of the slow axis of the outer protective layer is polarized. It is preferable to bond the outer protective layer and the polarizer so as to be 45 ± 10 ° or 135 ± 10 ° with respect to the absorption axis of the child. Since the slow axis angle is in the above range, a difference occurs between the light phase in the fast axis direction and the light phase in the slow axis direction. When applied to, the light emitted through the optical laminate can be made circularly polarized light. Therefore, a display device in which the optical layered body of the present embodiment is applied to an optical display element can be excellent in visibility even when a display image or the like is viewed through polarized sunglasses.

  The thickness of the protective layer is preferably 3 μm or more, and more preferably 5 μm or more. Moreover, it is preferable that the thickness of a protective layer is 50 micrometers or less, and it is more preferable that it is 30 micrometers or less. In addition, the upper limit value and lower limit value mentioned above can be combined arbitrarily. When the polarizing plate having a small thickness is used as an optical film, the rigidity of the polarizing plate is reduced as the thickness of the polarizing plate is reduced, and the rigidity is easily affected by the shrinkage stress of the first liquid crystal layer and the second liquid crystal layer. The manufacturing method of a laminated body and the manufacturing method of an optical laminated body with an adhesion layer can be used conveniently.

  The surface of the protective layer opposite to the polarizer may have a surface treatment layer, for example, a hard coat layer, an antireflection layer, an anti-sticking layer, an antiglare layer, a diffusion layer, etc. . The surface treatment layer may be another layer laminated on the protective layer, or may be formed by subjecting the surface of the protective layer to surface treatment.

  The hard coat layer is intended to prevent scratches on the surface of the polarizing plate, for example, and adds a cured film excellent in hardness, slipping characteristics, etc. due to an ultraviolet-curing resin such as acrylic or silicone to the surface of the protective layer. It can be formed by a method or the like. The antireflection layer is intended to prevent reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the prior art. The anti-sticking layer is intended to prevent adhesion with an adjacent layer.

  The anti-glare layer is intended to prevent external light from being reflected on the surface of the polarizing plate and hindering the visual recognition of the transmitted light of the polarizing plate. For example, a rough surface by a sandblasting method or an embossing method. The surface of the protective layer can be formed with a fine concavo-convex structure by a method such as a crystallization method or a transparent fine particle blending method. Examples of the transparent fine particles used for imparting a fine concavo-convex structure to the surface of the protective layer include silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide having an average particle size of 0.5 to 50 μm. Fine particles such as inorganic fine particles that can have the above-mentioned conductivity and organic fine particles such as crosslinked or uncrosslinked polymers. The content of the transparent fine particles is generally 2 to 50 parts by mass and preferably 5 to 25 parts by mass with respect to 100 parts by mass of the resin forming the layer forming the fine uneven structure. The antiglare layer may also serve as a diffusion layer (viewing angle expanding function or the like) for diffusing the light transmitted through the polarizing plate to expand the viewing angle or the like.

  When the surface treatment layer is another layer laminated on the protective layer of the polarizing plate, the thickness of the surface treatment layer is preferably 0.5 μm or more, and more preferably 1 μm or more. Moreover, it is preferable that it is 10 micrometers or less, and it is more preferable that it is 8 micrometers or less. If the thickness is less than 0.5 μm, scratches on the polarizing plate surface tend to be difficult to effectively prevent. On the other hand, when the thickness exceeds 10 μm, reverse curling of the polarizing plate may be difficult to be suppressed due to an increase in curing shrinkage or the like.

  The manufacturing method of the optical laminated body of the said embodiment and the optical laminated body with an adhesion layer is suitable when the thickness of a polarizing plate is 2 micrometers or more and 300 micrometers or less. The thickness of the polarizing plate may be 10 μm or more, 150 μm or less, 120 μm or less, or 80 μm or less.

  As for the polarizing plate, the measured MD curl value and the measured TD curl value of the polarizing plate obtained by peeling the protective film from the polarizing plate with the protective film measured by the method described in Examples below are independently -40 mm or more and 40 mm or less. Preferably, it is in the range of −30 mm to 35 mm, more preferably in the range of −20 mm to 30 mm. If the measured MD curl value and measured TD curl value are outside the above ranges, the polarizing plate tends to be cylindrical, and the curl shape tends to be difficult to obtain. In addition, if the measured MD curl value and the measured TD curl value of the polarizing plate with the protective film, which will be described later, and the measured MD curl value and the measured TD curl value of the polarizing plate are deviated, there is a gap between the protective film and the polarizing plate. This is not preferable because floating occurs or tunneling occurs where a gap is formed between the protective film and the polarizing plate.

(Polarizing plate with protective film)
A polarizing plate can be made into a polarizing plate with a protective film by laminating | stacking a protective film on the single side | surface normally. The protective film includes a resin film for a protective film and a protective film adhesive layer laminated thereon. The thickness of the protective film can be, for example, 30 to 200 μm, preferably 40 to 150 μm, and more preferably 50 to 120 μm.

  Examples of the resin constituting the protective film resin film include polyolefin resins such as polyethylene resins and polypropylene resins; cyclic polyolefin resins; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate resins; (Meth) acrylic resins and the like can be mentioned. Of these, polyester resins such as polyethylene terephthalate are preferable. The protective film resin film may have a single-layer structure, but may have a multilayer structure of two or more layers.

  As the adhesive constituting the protective film adhesive layer, the same adhesive as that constituting the adhesive layer described later can be used. The protect film can be obtained by forming an adhesive layer on the resin film surface for the protect film by applying an adhesive composition, drying, and the like. If necessary, the adhesive-coated surface of the protective film resin film may be subjected to a surface treatment (for example, corona treatment) to improve adhesion, and a primer layer (also referred to as an undercoat layer). A thin layer such as may be formed. Moreover, you may have the peeling layer for coat | covering and protecting the surface on the opposite side to the resin film side for protect films of the adhesion layer for protect films as needed. This release layer can be peeled off at an appropriate timing when being bonded to the polarizing plate.

  In the production process of a polarizing plate with a protective film, in which a protective film is bonded to the polarizing plate, a positive curl can be imparted in the length direction of the polarizing plate with the protective film by imparting a tension difference or a peripheral speed difference. Therefore, in the manufacturing method of the optical laminated body of the said embodiment and the manufacturing method of the optical laminated body with an adhesion layer, when using a polarizing plate with a protective film as an optical film, it is a polarizing plate with a protective film in the preparation process of a polarizing plate with a protective film. It can be expected that the reverse curl of the optical layered body or the optical layered body with the adhesive layer can be more easily suppressed by imparting the normal curl to.

  In the polarizing plate with a protective film, the measured MD curl value and the measured TD curl value of the polarizing plate with the protective film measured by the method described in the examples described later are independently in the range of −40 mm to 40 mm. Is more preferable, is in the range of −30 mm to 35 mm, and is more preferably in the range of −20 mm to 30 mm. When the measured MD curl value and measured TD curl value are outside the above ranges, the polarizing plate with a protective film tends to be cylindrical, and the curl shape tends to be difficult to obtain. In addition, when a polarizing plate with a protective film is processed into a predetermined size and bonded to an optical display element, it is difficult to hold the polarizing plate properly with a suction mechanism of a bonding apparatus. This is not preferable because of the tendency to occur.

  When the thickness of the polarizing plate with a protective film is reduced, the rigidity is reduced and the film is more susceptible to the shrinkage stress of the first liquid crystal layer and the second liquid crystal layer. The manufacturing method of the optical laminated body of a form and the manufacturing method of an optical laminated body with an adhesion layer can be used suitably. When the optical film 60 in the said embodiment is a polarizing plate with a protective film, the manufacturing method of the optical laminated body of the said embodiment and the optical laminated body with an adhesion layer is when the thickness of a polarizing plate with a protective film is 32 micrometers or more and 500 micrometers or less. Is preferred. The thickness of the polarizing plate with a protective film may be 40 μm or more, 350 μm or less, 200 μm or less, or 150 μm or less.

(Adhesive layer)
A 1st adhesion layer and a 2nd adhesion layer (henceforth these may be collectively called "adhesion layer") say the layer comprised with the adhesive. In the present specification, the “pressure-sensitive adhesive” is a flexible rubber-like material that expresses adhesiveness by adhering itself to an adherend such as an optical film or a liquid crystal layer. It is called. Moreover, the active energy ray hardening-type adhesive mentioned later can adjust a crosslinking degree and adhesive force by irradiating an energy ray.

  As the pressure-sensitive adhesive, a conventionally known pressure-sensitive adhesive having excellent optical transparency can be used without particular limitation. For example, a pressure-sensitive adhesive having a base polymer such as acrylic, urethane, silicone, or polyvinyl ether is used. be able to. Moreover, an active energy ray hardening-type adhesive, a thermosetting adhesive, etc. may be sufficient. Among these, a pressure-sensitive adhesive having a base polymer of an acrylic resin that is excellent in transparency, adhesive strength, removability (hereinafter also referred to as reworkability), weather resistance, heat resistance, and the like is preferable. The pressure-sensitive adhesive layer is preferably composed of a reaction product of a pressure-sensitive adhesive composition containing the (meth) acrylic resin (1), the crosslinking agent (2), and the silane compound (3). May be included.

((Meth) acrylic resin (1))
The (meth) acrylic resin (1) contained in the pressure-sensitive adhesive composition is a structural unit derived from a (meth) acrylic acid alkyl ester represented by the following formula (I) (hereinafter also referred to as “structural unit (I)”). .) Is a polymer (hereinafter also referred to as “(meth) acrylic acid ester polymer”) having a main component (for example, containing 50% by mass or more). In the present specification, “derived” means that the chemical structure changes due to polymerization of a compound such as (meth) acrylic acid alkyl ester.

[Wherein, R ¹⁰ represents a hydrogen atom or a methyl group, R ²⁰ represents an alkyl group having 1 to 20 carbon atoms, and the alkyl group has a linear, branched or cyclic structure. The hydrogen atom of the alkyl group may be replaced with an alkoxy group having 1 to 10 carbon atoms. ]

  Examples of the (meth) acrylic acid ester represented by the formula (I) include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, and n-butyl. (Meth) acrylate, i-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, i-hexyl (meth) acrylate, n-heptyl (meth) acrylate, n-octyl (Meth) acrylate, i-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n- and i-nonyl (meth) acrylate, n-decyl (meth) acrylate, i-decyl (meth) acrylate, n-dodecyl (meth) acrylate, cyclohexyl (meth) acrylate Isobornyl (meth) acrylate, stearyl (meth) acrylate, t- butyl (meth) acrylate. Specific examples of the alkoxy group-containing alkyl acrylate include 2-methoxyethyl (meth) acrylate and ethoxymethyl (meth) acrylate. Among these, it is preferable to include n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate, and it is particularly preferable to include n-butyl (meth) acrylate.

  The (meth) acrylic acid ester polymer may contain a structural unit derived from a monomer other than the structural unit (I). One type of structural unit derived from another monomer may be used, or two or more types may be used. Examples of other monomers that can be included in the (meth) acrylic acid ester polymer include monomers having a polar functional group, monomers having an aromatic group, and acrylamide monomers.

  Examples of the monomer having a polar functional group include (meth) acrylates having a polar functional group. Examples of the polar functional group include a hydroxy group, a carboxy group, a substituted amino group, and an unsubstituted amino group. Examples of polar functional groups include heterocyclic groups such as epoxy groups.

  The content of the structural unit derived from the monomer having a polar functional group in the (meth) acrylic acid ester polymer is preferably 20 with respect to 100 parts by mass of all structural units of the (meth) acrylic acid ester polymer. It is not more than 0.1 parts by mass, more preferably not less than 0.1 parts by mass and not more than 20 parts by mass, still more preferably not less than 0.1 parts by mass and not more than 10 parts by mass, particularly preferably not less than 0.5 parts by mass and not more than 10 parts by mass.

  As a monomer having an aromatic group, it has one (meth) acryloyl group and one or more aromatic rings (for example, a benzene ring, a naphthalene ring, etc.) in the molecule, and a phenyl group, a phenoxyethyl group, Or the (meth) acrylic acid ester which has a benzyl group is mentioned.

  The content of the structural unit derived from the monomer having an aromatic group in the (meth) acrylic acid ester polymer is preferably 50 with respect to 100 parts by mass of the total structural unit of the (meth) acrylic acid ester polymer. It is 4 parts by mass or more, more preferably 4 parts by mass or more and 50 parts by mass or less, and further preferably 4 parts by mass or more and 25 parts by mass or less.

  Examples of acrylamide monomers include N- (methoxymethyl) acrylamide, N- (ethoxymethyl) acrylamide, N- (propoxymethyl) acrylamide, N- (butoxymethyl) acrylamide, and N- (2-methylpropoxymethyl) acrylamide. Etc. By including these structural units, bleeding out of additives such as an antistatic agent described later can be suppressed.

  Furthermore, as structural units derived from other monomers other than structural unit (I), structural units derived from styrene monomers, structural units derived from vinyl monomers, ) A structural unit or the like derived from a monomer having an acryloyl group may be contained.

  The weight average molecular weight (hereinafter also simply referred to as “Mw”) of the (meth) acrylic resin (1) is preferably 500,000 to 2.5 million. When the weight average molecular weight is 500,000 or more, the durability of the pressure-sensitive adhesive layer in a high temperature and high humidity environment can be improved. When the weight average molecular weight is 2.5 million or less, the operability when applying a coating liquid containing the pressure-sensitive adhesive composition is improved. The molecular weight distribution (Mw / Mn) represented by the ratio between the weight average molecular weight (Mw) and the number average molecular weight (hereinafter also simply referred to as “Mn”) is usually 2 to 10. In the present specification, “weight average molecular weight” and “number average molecular weight” are polystyrene-converted values measured by gel permeation chromatography (GPC) method.

  When the (meth) acrylic resin (1) is dissolved in ethyl acetate to give a solution having a concentration of 20% by mass, the viscosity at 25 ° C. is preferably 20 Pa · s or less, preferably 0.1 to 15 Pa · s. It is more preferable that When the viscosity of the (meth) acrylic resin (1) at 25 ° C. is within the above range, it contributes to reworkability and the like. The viscosity can be measured with a Brookfield viscometer.

  From the viewpoint of achieving both adhesiveness and durability, the glass transition temperature of the (meth) acrylic resin (1) is preferably −10 ° C. to −60 ° C. The glass transition temperature can be measured with a differential scanning calorimeter (DSC).

  The (meth) acrylic resin (1) may contain two or more (meth) acrylic acid ester polymers. As such (meth) acrylic acid ester polymer, for example, the main component is the structural unit (I) derived from the (meth) acrylic acid ester, and the weight average molecular weight is 50,000 to 300,000. (Meth) acrylic acid ester polymer having a relatively low molecular weight as in the range of

(Crosslinking agent (2))
The pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer preferably contains a crosslinking agent (2). Examples of the crosslinking agent (2) include conventional crosslinking agents (for example, isocyanate compounds, epoxy compounds, aziridine compounds, metal chelate compounds, peroxides, etc.), and particularly the pot life and crosslinking rate of the pressure-sensitive adhesive composition. From the viewpoint, an isocyanate compound is preferable.

  The isocyanate compound is preferably a compound having at least two isocyanato groups (—NCO) in the molecule. For example, an aliphatic isocyanate compound (for example, hexamethylene diisocyanate), an alicyclic isocyanate compound (for example, isophorone diisocyanate). ), Hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate, aromatic isocyanate compounds (for example, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.). The crosslinking agent (2) is an adduct (adduct) of the above isocyanate compound with a polyhydric alcohol compound [for example, an adduct with glycerol, trimethylolpropane or the like], an isocyanurate, a burette type compound, a polyether polyol, Derivatives such as urethane prepolymer type isocyanate compounds obtained by addition reaction with polyester polyol, acrylic polyol, polybutadiene polyol, polyisoprene polyol and the like may also be used. A crosslinking agent (2) can be used individually or in combination of 2 or more types. Of these, tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate and their polyhydric alcohol compounds or their isocyanurate compounds are preferred from the viewpoint of durability.

  The ratio of the crosslinking agent (2) is, for example, 0.01 to 10 parts by mass, preferably 0.1 to 3 parts by mass, and more preferably 0.1 to 100 parts by mass of the (meth) acrylic resin (1). 1-1 mass part may be sufficient. If it is not more than the above upper limit value, it is advantageous for improving the durability, and if it is not less than the above lower limit value, the generation of gas is suppressed and it is advantageous for improving the reworkability.

(Silane compound (3))
The pressure-sensitive adhesive composition contains a silane compound (3). By containing the silane compound (3), the adhesion between the adhesive layer and the layer to be laminated can be enhanced. Two or more silane compounds (3) may be used.

  Examples of the silane compound (3) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3 -Glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, Examples include 3-methacryloyloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane.

  Moreover, the silane compound (3) can include an oligomer derived from the silane compound (3).

  Content of the silane compound (3) in an adhesive composition is 0.01-10 mass parts normally with respect to 100 mass parts of (meth) acrylic-type resin (1), Preferably it is 0.03-5 mass. Part, more preferably 0.05 to 2 parts by mass, still more preferably 0.1 to 1 part by mass. When the content of the silane compound (3) is 0.01 parts by mass or more, adhesion between the adhesive layer and an adherend such as an optical film or a liquid crystal layer is likely to be improved. When the content is 10 parts by mass or less, bleeding out of the silane compound (3) from the adhesive layer can be suppressed.

(Other ingredients (4))
The pressure-sensitive adhesive composition for forming the pressure-sensitive adhesive layer includes, as other components (4), an antistatic agent using an ionic compound or the like, a solvent, a crosslinking catalyst, a tackifier resin (tackifier), a plasticizer, a weathering stabilizer, An additive such as a softener, a dye, a pigment, an inorganic filler, and a resin other than an acrylic resin can be used alone or in combination of two or more.

(Active energy ray-curable adhesive)
It is also useful to blend a UV curable compound such as a polyfunctional acrylate into the PSA composition, form an PSA layer, and then cure it by irradiating with UV rays to make it a harder PSA layer. A mold adhesive can be used. The “active energy ray-curable pressure-sensitive adhesive” has a property of being cured by irradiation with energy rays such as ultraviolet rays and electron beams. Since the activated energy ray-curable adhesive has adhesiveness even before irradiation with energy rays, it adheres to an adherend such as an optical film or a liquid crystal layer, and is cured by irradiation with energy rays to provide adhesion. It is an adhesive having properties that can be adjusted.

  The active energy ray-curable pressure-sensitive adhesive generally contains an acrylic pressure-sensitive adhesive and an energy beam polymerizable compound as main components. Usually, a crosslinking agent is further blended, and if necessary, a photopolymerization initiator, a photosensitizer and the like can be blended.

  The adhesive layer preferably has a storage elastic modulus of 0.10 to 10.0 MPa at 23 ° C., more preferably 0.15 to 5.0 MPa. It is preferable that the storage elastic modulus at 23 ° C. is 0.10 MPa or more because problems such as peeling can be suppressed when a temperature change occurs. Moreover, since it is hard to produce the fall of durability by the fall of adhesive force as it is 10.0 Mpa or less, it is preferable. The storage elastic modulus of the adhesive layer can be measured with a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device “DYNAMIC ANALYZER RDA II” manufactured by REOMETRIC.

  The thickness of the adhesive layer is preferably 3 μm or more, and more preferably 5 μm or more. Moreover, it is preferable that the thickness of the adhesion layer is 40 micrometers or less, and it is more preferable that it is 30 micrometers or less. In addition, the upper limit value and lower limit value mentioned above can be combined arbitrarily.

(Adhesive cured layer)
The first adhesive cured layer and the second adhesive cured layer (hereinafter collectively referred to as “adhesive cured layer”) are formed by curing curable components in the adhesive composition. Layer. The adhesive composition for forming the adhesive cured layer is an adhesive other than the pressure-sensitive adhesive (pressure-sensitive adhesive), and examples thereof include water-based adhesives and active energy ray-curable adhesives. Examples of the water-based adhesive include an adhesive obtained by dissolving or dispersing a polyvinyl alcohol-based resin in water. Examples of the active energy ray-curable adhesive include a solventless active energy ray-curable adhesive containing a curable compound that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Can be mentioned. By using a solventless active energy ray-curable adhesive, adhesion between layers can be improved. On the other hand, if the active energy ray-curable adhesive contains a solvent (particularly an organic solvent), sufficient adhesiveness can be obtained even if the curable components contained in the adhesive are the same. When the optical layered body is cut into a predetermined size, problems such as peeling at the end portions are likely to occur. Moreover, since the process of drying a solvent is added, the additional shrinkage stress by heat | fever is applied and there exists a possibility that a reverse curl may occur easily in an optical laminated body or an optical laminated body with an adhesion layer.

  Storage elasticity is an index indicating the hardness of the activated energy ray-curable adhesive after curing when a solventless active energy ray-curable adhesive containing a curable compound that is cured by irradiation with active energy rays is used. The rigidity obtained by multiplying the ratio by the thickness is often higher than the rigidity of the water-based adhesive after curing. When the adhesive cured layer provided between the first liquid crystal layer and the second liquid crystal layer has high rigidity, curling due to shrinkage stress at the time of peeling of the substrate can be prevented, so that solventless activation energy ray curing is possible. It is preferable to use an adhesive.

  The active energy ray-curable adhesive preferably contains one or both of a cationically polymerizable curable compound and a radically polymerizable curable compound because it exhibits good adhesiveness. The active energy ray-curable adhesive can further include a cationic polymerization initiator or a radical polymerization initiator for initiating the curing reaction of the curable compound.

  Examples of cationically polymerizable curable compounds include epoxy compounds (compounds having one or more epoxy groups in the molecule) and oxetane compounds (one or two or more oxetane rings in the molecule). Compound), or a combination thereof.

  Examples of the radical polymerizable curable compound include (meth) acrylic compounds (compounds having one or more (meth) acryloyloxy groups in the molecule), and others having radical polymerizable double bonds. The vinyl compound of these, or these combination can be mentioned.

  The active energy ray-curable adhesive can contain a sensitizer as necessary. By using a sensitizer, the reactivity is improved, and the mechanical strength and adhesive strength of the adhesive layer can be further improved. As a sensitizer, a well-known thing can be applied suitably. When mix | blending a sensitizer, it is preferable to make the compounding quantity into the range of 0.1-20 mass parts with respect to 100 mass parts of total amounts of an active energy ray hardening-type adhesive agent.

  Active energy ray curable adhesives are ion trapping agents, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow regulators, plasticizers, antifoaming agents, and antistatic agents as necessary. An additive such as an agent, a leveling agent, and a solvent can be contained.

  You may form an adhesive composition layer by apply | coating an adhesive composition to the joint surface of the 1st liquid crystal layer with a base material layer, or the 2nd liquid crystal layer with a base material layer. As a coating method, a normal coating technique using a die coater, comma coater, reverse roll coater, gravure coater, rod coater, wire bar coater, doctor blade coater, air doctor coater or the like may be employed.

  The drying method when the aqueous adhesive is used is not particularly limited. For example, a drying method using a hot air dryer or an infrared dryer can be employed.

  When an active energy ray-curable adhesive is used, the adhesive composition layer is cured by irradiating active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays to form an adhesive cured layer. be able to. As the active energy ray, ultraviolet rays are preferable, and as a light source in this case, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation mercury lamp, a metal halide lamp, or the like is used. it can.

When the adhesive composition layer is cured by ultraviolet irradiation, the light irradiation intensity of ultraviolet rays is determined for each composition of the adhesive composition and is not particularly limited, but is 10 to 1,000 mW / cm ² . It is preferably 100 to 600 mW / cm ² . When the light irradiation intensity to the resin composition is less than 10 mW / cm ² , the reaction time becomes too long, and when it exceeds 1,000 mW / cm ² , the heat radiated from the light source and the time of polymerization of the adhesive composition Heat generation may cause yellowing in the resulting cured adhesive layer. Further, there is a possibility that further contraction stress is generated by heat radiated from the light source. The irradiation intensity is an intensity in a wavelength region effective for activation of a polymerization initiator, preferably a photocationic polymerization initiator, more preferably an intensity in a wavelength region of a wavelength of 400 nm or less, and further preferably a wavelength of 280 to 320 nm. It is the intensity in the wavelength region. By irradiating once or a plurality of times with such light irradiation intensity, the integrated light quantity is 10 mJ / cm ² or more, preferably 100 to 1,000 mJ / cm ² , more preferably 200 to 600 mJ / cm ^2. It is preferable to set. When the cumulative amount of light to the adhesive composition layer is less than 10 mJ / cm ² , the generation of active species derived from the polymerization initiator is not sufficient, and the adhesive composition layer is not sufficiently cured. When the integrated light quantity exceeds 1,000 mJ / cm ² , the irradiation time becomes very long, which is disadvantageous for improving productivity. Further, there is a possibility that further contraction stress is generated by heat radiated from the light source. Depending on the type of the first base material layer, the second base material layer, the first liquid crystal layer, the second liquid crystal layer, the combination of the components in the adhesive composition, etc., the wavelength at the time of light irradiation (UVA (320 to 390 nm)) And UVB (280 to 320 nm, etc.) are different, and the required integrated light amount also changes according to the wavelength at the time of light irradiation.

  The viscosity of the active energy ray-curable adhesive may be selected so that it can be applied by any coating method, but the viscosity at a temperature of 25 ° C. is preferably in the range of 10 to 1,000 mPa · sec. More preferably, it is in the range of 20 to 500 mPa · sec. When the viscosity is too small, it tends to be difficult to form a cured adhesive layer having a desired thickness. On the other hand, if the viscosity is too large, the active energy ray-curable adhesive is difficult to flow during coating, and it is difficult to obtain a uniform coating film without unevenness. The viscosity here is a value measured at 10 rps after adjusting the temperature of the adhesive to 25 ° C. using an E-type viscometer.

  The storage elastic modulus at a temperature of 30 ° C. of the adhesive cured layer is preferably 100 MPa or more, more preferably 1000 MPa or more, more preferably 1500 MPa or more, from the viewpoint of durability of the polarizing plate which is an optical film or suppression of reverse curl, Particularly preferably, it is 2000 MPa or more. On the other hand, when the storage elastic modulus of the adhesive cured layer is too large, the adhesive cured layer becomes too hard, and when performing punching processing or the like for making the optical laminate or the optical laminate with the adhesive layer into a predetermined size. The workability of the steel may deteriorate. For this reason, the storage elastic modulus at a temperature of 30 ° C. of the cured adhesive layer is preferably 10,000 MPa or less, more preferably 8000 MPa or less, and further preferably 5000 MPa or less.

The storage elastic modulus at a temperature of 30 ° C. of the adhesive cured layer can be calculated by the following procedure. Using a coating machine [Bar Coater, manufactured by Daiichi Rika Co., Ltd.] on one side of a cyclic polyolefin-based resin film having a thickness of 50 μm, the above active energy ray-curable adhesive is applied. A cyclic polyolefin resin film having a thickness of 50 μm is laminated. Next, the adhesive composition layer is cured by irradiating with ultraviolet rays so that the integrated light quantity becomes 1500 mJ / cm ² (UVB) by “D bulb” manufactured by Fusion UV Systems. This is cut into a size of 5 mm × 30 mm, and one cyclic polyolefin resin film is peeled off to obtain a cured adhesive layer with a resin film. Grip the cured adhesive layer with a resin film at a distance of 2 cm between the grips using a dynamic viscoelasticity measuring device “DVA-220” manufactured by IT Measurement Control Co., Ltd. so that its long side is in the tensile direction. Then, the tensile modulus and the shrinkage frequency are set to 10 Hz, the temperature rising rate is set to 10 ° C./min, and the temperature is raised to obtain the storage elastic modulus at a temperature of 30 ° C.

  The thickness of the cured adhesive layer is preferably 10 μm or less, more preferably 5 μm or less, and even more preferably 2 μm or less. Moreover, it is preferable that it is 0.1 micrometer or more, It is more preferable that it is 0.5 micrometer or more, Furthermore, it is preferable that it is 1 micrometer or more. When the thickness of the adhesive cured layer is equal to or more than the lower limit, the rigidity is increased, and the curl suppressing effect in the optical laminate or the optical laminate with the adhesive layer can be improved. On the other hand, by setting the thickness of the cured adhesive layer to be within the upper limit, it is possible to prevent coating defects such as entrapment of bubbles.

(Adhesive layer with release layer)
The first pressure-sensitive adhesive layer with a release layer and the second pressure-sensitive adhesive layer with a release layer (hereinafter, these may be collectively referred to as “pressure-sensitive adhesive layer with a release layer”) are, for example, adhesive on the release treatment surface of the release layer. It can be obtained by forming an adhesive layer by applying or drying the agent composition. The pressure-sensitive adhesive layer with a release layer may have another release layer for covering and protecting the surface of the pressure-sensitive adhesive layer opposite to the release layer side, if necessary. The release layer and other release layers can be released at an appropriate timing.

(Peeling layer)
The first release layer and the second release layer (hereinafter collectively referred to as “release layer”) can be peeled from the adhesive layer and support the adhesive layer formed on the release layer. And has a function of protecting the adhesive layer. As the release layer, a known release film or release paper can be used. For example, a release layer such as a silicone coating is applied to a film formed of a resin material exemplified as a base material layer described later. May be. For the other release layers, the same material as the release layer can be used.

  The release layer can be peeled from the adhesive layer, and the magnitude of the release force between the release layer and the adhesive layer needs to be determined in consideration of the order of peeling the release layer. The above peeling force is prepared by preparing a test specimen (200 mm in length and 25 mm in width) having an adhesive layer on the peeling layer, and bonding it to a glass of an appropriate size. -50NX) is used to chuck the partially peeled release layer and glass so as to form a peel start point, and peel the peel layer in the direction of 180 ° at a speed of 300 mm / min. The peel strength thus made can be used as the peel force. The peeling force between the peeling layer and the adhesive layer is preferably 0.01 to 0.20 N / 25 mm, more preferably 0.02 to 0.10 N / 25 mm, and 0.02 to 0.00. More preferably, it is 06 N / 25 mm. If it is less than 0.01 N / 25 mm, there is a possibility that floating occurs between the peeling layer and the adhesive layer during the conveyance. Further, if it exceeds 0.20 N / 25 mm, the adhesiveness between the release layer and the adhesive layer is high, and the release layer is difficult to peel from the adhesive layer. A part of the adhesive layer is attached to the release layer, or peeling between unintended layers (for example, between the adhesive layer and the adhesive layer on the side opposite to the release layer) May occur).

(Liquid crystal layer)
The first liquid crystal layer and the second liquid crystal layer (hereinafter, both may be collectively referred to as “liquid crystal layer”) are cured layers formed by polymerizing a polymerizable liquid crystal compound, and are retardation layers. There may be. The optical characteristics of the liquid crystal layer can be adjusted by the alignment state of the polymerizable liquid crystal compound.

  In this specification, the polymerizable liquid crystal compound whose optical axis is aligned horizontally with respect to the substrate layer plane is horizontally aligned, and the polymerizable liquid crystal compound whose optical axis is aligned vertically with respect to the substrate layer plane. Defined as vertical alignment. The optical axis means a direction in which a cross section cut out in a direction perpendicular to the optical axis is a circle in the refractive index ellipsoid formed by the orientation of the polymerizable liquid crystal compound, that is, a direction in which the refractive indexes in two directions are equal. .

  Examples of the polymerizable liquid crystal compound include a rod-like polymerizable liquid crystal compound and a disk-like polymerizable liquid crystal compound. When the rod-like polymerizable liquid crystal compound is aligned horizontally or vertically with respect to the base material layer, the optical axis of the polymerizable liquid crystal compound coincides with the major axis direction of the polymerizable liquid crystal compound. When the discotic polymerizable liquid crystal compound is aligned, the optical axis of the polymerizable liquid crystal compound exists in a direction perpendicular to the disc surface of the polymerizable liquid crystal compound.

  In order for the liquid crystal layer formed by polymerizing the polymerizable liquid crystal compound to exhibit in-plane retardation, the polymerizable liquid crystal compound may be aligned in a suitable direction. When the polymerizable liquid crystal compound is rod-shaped, an in-plane retardation is developed by aligning the optical axis of the polymerizable liquid crystal compound horizontally with respect to the substrate layer plane. In this case, the optical axis direction and the slow axis The direction matches. When the polymerizable liquid crystal compound has a disc shape, an in-plane retardation is developed by aligning the optical axis of the polymerizable liquid crystal compound horizontally with respect to the plane of the base material layer. In this case, the optical axis and the slow axis Is orthogonal. The alignment state of the polymerizable liquid crystal compound can be adjusted by a combination of the alignment film and the polymerizable liquid crystal compound.

  The polymerizable liquid crystal compound is a compound having a polymerizable group and having liquid crystallinity. The polymerizable group means a group involved in the polymerization reaction, and is preferably a photopolymerizable group. Here, the photopolymerizable group refers to a group that can participate in a polymerization reaction by an active radical, an acid, or the like generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group, and oxetanyl group. Among them, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable. The liquid crystalline property of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the thermotropic liquid crystal may be a nematic liquid crystal or a smectic liquid crystal when classified by order.

  As the rod-like polymerizable liquid crystal compound and the disk-like polymerizable liquid crystal compound, known ones can be used. For example, JP-A-2015-163937, JP-A-2016-42185, International Publication No. 2016 / Those exemplified in JP-A-158940 and JP-A-2016-224128 can be used.

  The liquid crystal layer may have a single-layer structure or a multilayer structure of two or more layers. In the case of having a multilayer structure of two or more layers, a liquid crystal layer having a multilayer structure of two or more layers may be formed on the substrate layer when preparing a liquid crystal layer with a substrate layer described later. When the liquid crystal layer has a single-layer structure, the thickness of the liquid crystal layer is preferably 0.3 μm or more, and may be 1 μm or more, usually 10 μm or less, and preferably 5 μm or less. When the liquid crystal layer has a multilayer structure of two or more layers, the thickness of the liquid crystal layer is preferably 0.5 μm or more, may be 1 μm or more, and is usually 10 μm or less, preferably 5 μm or less. The thickness of the liquid crystal layer is preferably 5 μm or less from the viewpoint of contributing to thinning of the entire polarizing plate and effectively suppressing the reverse curl that may occur. In addition, when the thickness of the liquid crystal layer is less than 0.3 μm, the degree of reverse curl tends to be slight. Therefore, it is necessary to use the method for manufacturing an optical layered body and the method for manufacturing an optical layered body with an adhesive layer of the above embodiment. The nature is small.

(Liquid crystal layer with substrate layer)
A first liquid crystal layer with a base material layer and a second liquid crystal layer with a base material layer (hereinafter, both may be collectively referred to as “liquid crystal layer with a base material layer”) are formed on the base material layer with a polymerizable liquid crystal compound. It can obtain by forming the liquid crystal layer which is a hardened layer formed by apply | coating and drying the composition for liquid crystal layer formation containing this, and drying and polymerizing a polymeric liquid crystal compound. The composition for forming a liquid crystal layer may be applied on the alignment layer when the alignment layer described later is formed on the base material layer. When the liquid crystal layer has a multilayer structure of two or more layers, What is necessary is just to form a multilayer structure by apply | coating the composition for layer formation one by one.

  The composition for forming a liquid crystal layer usually contains a solvent in addition to the polymerizable liquid crystal compound. The composition for forming a liquid crystal layer may further contain a polymerization initiator, a reactive additive, a polymerization inhibitor, and the like. Solvents, polymerization initiators, reactive additives, polymerization inhibitors and the like are described in JP-A No. 2015-163937, JP-A No. 2016-42185, International Publication No. 2016/158940, and JP-A No. 2016-224128. What is illustrated can be used.

  Application of the composition for forming a liquid crystal layer may be, for example, a spin coating method, an extrusion method, a gravure coating method, a die coating method, a slit coating method, a bar coating method, an applicator method, or a flexo method. It can be performed by a known method such as a printing method. After applying the composition for forming a liquid crystal layer, it is preferable to remove the solvent under conditions where the polymerizable liquid crystal compound contained in the coating layer is not polymerized. Examples of the drying method include a natural drying method, a ventilation drying method, a heat drying method, and a vacuum drying method.

  Polymerization of the polymerizable liquid crystal compound performed after drying the coating layer can be performed by a known method of polymerizing a compound having a polymerizable functional group. Examples of the polymerization method include thermal polymerization and photopolymerization. Photopolymerization is preferable from the viewpoint of ease of polymerization. When a polymerizable liquid crystal compound is polymerized by photopolymerization, a composition containing a photopolymerization initiator is used as a liquid crystal layer forming composition, this liquid crystal layer forming composition is applied, dried, and dried in a dried film. It is preferable to align the polymerizable liquid crystal compound contained in the liquid crystal and perform photopolymerization while maintaining the liquid crystal alignment state.

  Photopolymerization can be performed by irradiating an active energy ray to the polymerizable liquid crystal compound in which the liquid crystal is aligned in the dry film. The active energy ray to be irradiated can be appropriately selected according to the type and amount of the polymerizable group possessed by the polymerizable liquid crystal compound, the type of the photopolymerization initiator, and the like. For example, visible light, ultraviolet light, laser light And one or more active energy rays selected from the group consisting of X-rays, α rays, β rays and γ rays. Among these, ultraviolet rays are preferable from the viewpoint that the progress of the polymerization reaction can be easily controlled and those widely used in the field as a photopolymerization apparatus can be used, and the polymerizable liquid crystal compound can be photopolymerized by ultraviolet rays. It is preferable to select the kind of photopolymerization initiator. In the photopolymerization, the polymerization temperature can be controlled by irradiating the active energy ray while cooling the dry film by an appropriate cooling means.

(Base material layer)
The first base material layer and the second base material layer (hereinafter, both may be collectively referred to as “base material layer”) are formed on these base material layers, which will be described later. It functions as an alignment layer and a support layer that supports the first liquid crystal layer and the second liquid crystal layer. The base material layer is preferably a film formed of a resin material.

  As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability and the like is used. Specifically, polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic acid, poly (meth) methyl acrylate, etc. (Meth) acrylic acid resins; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate resins; polystyrene resins; Arylate resin; Polysulfone resin; Polyethersulfone resin; Polyamide resin; Polyimide resin; Polyetherketone resin; Polyphenylene sulfide resin; Polyphenyle Oxide resin, and mixtures thereof, may be mentioned copolymer and the like. Among these resins, it is preferable to use any of cyclic polyolefin-based resins, polyester-based resins, cellulose ester-based resins and (meth) acrylic acid-based resins, or a mixture thereof.

  The base material layer may be a single layer in which one kind or two or more kinds of resins are mixed, and may have a multilayer structure of two or more layers. In the case of having a multilayer structure, the resins constituting each layer may be the same as or different from each other, and may be a coated / cured product layer such as a hard coat layer.

  Arbitrary additives may be added to the resin material forming the film formed of the resin material. Examples of the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.

  The thickness of the first base material layer and the second base material layer is not particularly limited, but in general, it is preferably 1 to 300 μm and preferably 10 to 200 μm from the viewpoint of workability such as strength and handleability. More preferably, it is 30-120 micrometers.

  When the 1st liquid crystal layer with a base material layer has the 1st orientation layer mentioned below, or when the 2nd liquid crystal layer with a base material layer has the 2nd orientation layer mentioned below, the 1st base material layer, the 1st orientation layer, In order to improve the adhesion and the adhesion between the second substrate layer and the second alignment layer, at least the surface of the first substrate layer on the side where the first alignment layer is formed, and at least the second Corona treatment, plasma treatment, flame treatment or the like may be performed on the surface of the base material layer on which the second alignment layer is formed, or a primer layer or the like may be formed.

  The base material layer can be peeled off from the liquid crystal layer or an orientation layer (first orientation layer or second orientation layer) described later, and the magnitude of the peeling force between the base material layer and the liquid crystal layer or orientation layer. Needs to be considered according to the order in which the base material layer is peeled off. The peeling force is between the peeling layer and the adhesive layer except that a measuring test piece having a liquid crystal layer on the base material layer or a measuring test piece having an alignment layer and a liquid crystal layer on the base material layer is used. It can be measured in the same manner as the method for measuring the peeling force. The peel force between the base material layer and the liquid crystal layer or the alignment layer is preferably 0.01 to 0.50 N / 25 mm, more preferably 0.03 to 0.20 N / 25 mm, and More preferably, it is 05-0.18N / 25mm. If the peeling force is lower than the above lower limit, there is a possibility that floating occurs between the base material layer and the liquid crystal layer or the alignment layer in the middle of conveyance. Further, when the peeling force exceeds the above upper limit, the adhesiveness is too high, so that the liquid crystal layer or the liquid crystal layer and the alignment layer cannot be transferred to the other liquid crystal layer, optical film, etc. There is a possibility that the peeling interface may be changed while each member is conveyed in the process of manufacturing the optical layered body with an adhesive layer.

  Peeling force between the first base material layer and the first liquid crystal layer or the first alignment layer described later (hereinafter sometimes referred to as “first peeling force”), the second base material layer, and the second liquid crystal layer. Alternatively, the difference from the peeling force (hereinafter sometimes referred to as “second peeling force”) with the second alignment layer described later is preferably 0.01 N / 25 mm or more, and 0.03 N / 25 mm. More preferably. When the first base material layer is peeled first from the liquid crystal layer laminate with the base material layer, the second peel force is preferably larger than the first peel force. When peeling a 2nd base material layer, it is preferable that a 1st peeling force is larger than a 2nd peeling force. Moreover, when peeling a 1st base material layer from a liquid crystal layer laminated body with a base material layer first, from the viewpoint of long processing, the peeling force between a 2nd peeling layer and a 2nd adhesion layer <1st It is preferable that the relationship of peeling force <second peeling force is satisfied.

(Orientation layer)
The first liquid crystal layer with a base material layer may include a first alignment layer between the first base material layer and the first liquid crystal layer. In addition, the second liquid crystal layer with the base material layer may include a second alignment layer between the second base material layer and the second liquid crystal layer.

  The first alignment layer and the second alignment layer have an alignment regulating force for aligning the liquid crystal compounds contained in the first liquid crystal layer and the second liquid crystal layer formed on these alignment layers in a desired direction. As the first alignment layer and the second alignment layer, an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, a concavo-convex pattern or a plurality of grooves (grooves) on the surface of the layer. The first alignment layer and the second alignment layer may be the same type of layer or different types of layers. The thickness of the first alignment layer and the second alignment layer is usually 10 to 4000 nm, and preferably 50 to 3000 nm.

  For the orientation polymer layer, a composition in which the orientation polymer is dissolved in a solvent is applied to the base material layer (first base material layer or second base material layer), the solvent is removed, and a rubbing treatment is performed as necessary. Can be formed. In this case, in the orientation polymer layer formed of the orientation polymer, the orientation regulating force can be arbitrarily adjusted depending on the surface state of the orientation polymer and the rubbing conditions.

  The photo-alignable polymer layer is formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent to a base layer (first base layer or second base layer) and irradiating with light such as ultraviolet rays. By doing so, it can be formed. In particular, when the orientation regulating force is developed in the horizontal direction, it can be formed by irradiating polarized light. In this case, in the photo-alignable polymer layer, the alignment regulating force can be arbitrarily adjusted depending on the polarization irradiation conditions for the photo-alignable polymer.

  The groove alignment layer is an active method for forming a concavo-convex pattern by performing exposure, development, etc. through an exposure mask having a pattern-shaped slit on the photosensitive polyimide film surface, a plate-shaped master having grooves on the surface, and the like. A method of forming an uncured layer of an energy ray curable resin, transferring the layer to a base material layer (first base material layer or second base material layer), and curing the base material layer (first base material layer) Alternatively, an uncured layer of an active energy ray-curable resin is formed on the second base material layer, and the layer is formed by a method of curing by forming irregularities by pressing a roll-shaped master having irregularities, etc. can do.

  When the first liquid crystal layer with the base material layer includes the first alignment layer, when the first base material layer is peeled off, the first alignment layer may be peeled off together with the first base material layer. The first alignment layer may remain. When the second liquid crystal layer with the base material layer includes the second alignment layer, the second alignment layer may be peeled off together with the second base material layer when the second base material layer is peeled off. The second alignment layer may remain. Whether the first alignment layer is peeled off together with the first base material layer or remains in the first liquid crystal layer can be set by adjusting the relationship of adhesion between the layers. It is adjusted according to the components of the composition for forming a liquid crystal layer used for forming the first liquid crystal layer, surface treatment such as the above corona treatment, plasma treatment, flame treatment, and primer layer performed on the base material layer. be able to. Similarly, the second alignment layer may be peeled off together with the second base material layer by the surface treatment performed on the second base material layer, or may be left in the second liquid crystal layer.

  When the first alignment layer remains on the first liquid crystal layer, the first adhesive cured layer can be provided on the first alignment layer. When the second alignment layer remains on the second liquid crystal layer, the second adhesive layer can be provided on the second alignment layer.

(Circularly polarizing plate)
The optical laminated body of this embodiment can be used as a circularly polarizing plate. When using the optical laminated body 70 shown in FIG.4 (b) as a circularly-polarizing plate, let the optical film 60 be a polarizer, a polarizing plate, or a polarizing plate with a protective film, and let the 1st liquid crystal layer 12 be 1/2 wavelength phase difference. The second liquid crystal layer 22 may be a quarter wavelength retardation layer. Alternatively, in the same manner as described above, the optical film 60 is a polarizer, a polarizing plate, or a polarizing plate with a protective film, and the first liquid crystal layer 12 is a quarter wavelength retardation layer having a reverse wavelength dispersion. A circularly polarizing plate can also be obtained by using the two liquid crystal layer 22 as a positive C plate.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated further more concretely, this invention is not limited by these examples. Unless otherwise specified, “%” and “part” in Examples and Comparative Examples are mass% and mass part.

[Measurement of curl (1)]
Cut-out pieces cut out from the optical layered body with an adhesive layer obtained in each Example and each Comparative Example so as to have a rhombus shape with a side length of 100 mm, and the diagonals thereof being parallel to the MD direction and the TD direction, respectively. Was allowed to stand for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 55%, and then the first separator was peeled off to obtain a test piece. After sufficiently neutralizing the test piece, the test piece was placed on a reference surface (horizontal stage) with the concave surface facing upward, and the height from the reference surface was measured for each of the four corners of the test piece. When the test piece is placed on the reference surface so that the protective film side is on the upper side, if the corner of the test piece rises, this curl is regarded as a positive curl, and the height of the angle from the reference surface is expressed as a positive value. did. On the other hand, when the test piece is placed on the reference surface so that the protective film side is on the lower side, if the corner of the test piece rises, this curl is regarded as a reverse curl, and the height of the angle from the reference surface is expressed as a negative value. .

  About the measurement value obtained about the test piece from the optical laminated body with an adhesion layer, the value which averaged the measurement value of the height from the reference plane of two corners on the diagonal parallel to MD direction was measured MD curl value Then, a value obtained by averaging the measured values of the heights from the reference plane of two corners on the diagonal line parallel to the TD direction was calculated as an actual TD curl value.

  Moreover, also about the polarizing plate with a protective film used by each Example and each comparative example, the height from a reference plane is measured about each of four corners of the test piece cut out by the same procedure as the above, and the same as above. The measured values were averaged by the procedure, and the measured MD curl value and the measured TD curl value were calculated for the polarizing plate with a protective film.

  The value obtained by subtracting the measured MD curl value of the optical laminate with the adhesive layer from the measured MD curl value of the obtained polarizing plate with the protective film was defined as the MD curl value of the optical laminate with the adhesive layer in the case of having the protective film. . Similarly, the value obtained by subtracting the measured TD curl value of the optical laminate with the adhesive layer from the measured TD curl value of the obtained polarizing plate with the protective film is the TD curl of the optical laminate with the adhesive layer with the protective film. Value.

[Measurement of curl (2)]
Measurement of the curl (1) except that the test piece was prepared by peeling off the protective film together with the first separator from the cut piece cut out from the optical layered body with the adhesive layer obtained in each example and each comparative example. The measured MD curl value and measured TD curl value of the optical layered body from which the protective film was peeled off were calculated in the same procedure as described above. In addition, when the test piece is placed on the reference surface so that the polarizing plate side is on the upper side, when the corner of the test piece is lifted, this measurement is taken as a positive curl, and the height of the angle from the reference surface is a positive numerical value. Expressed in On the other hand, when the test piece is placed on the reference surface so that the polarizing plate side is on the lower side, when the corner of the test piece is lifted, this curl is regarded as a reverse curl, and the height of the angle from the reference surface is expressed as a negative value. .

  Further, for each of the four corners of the test piece cut out in the same procedure as described above, the polarizing plate from which the protective film was peeled off from the cut piece cut out from the polarizing plate with the protective film used in each example and each comparative example. The height from the reference surface was measured, and the measured values were averaged in the same procedure as above to calculate the measured MD curl value and measured TD curl value of the polarizing plate from which the protective film was peeled off.

  The value obtained by subtracting the actual MD curl value of the optical laminate from which the protective film has been peeled from the actual MD curl value of the polarizing plate from which the protective film has been peeled is the MD curl value of the optical laminate with the adhesive layer without the protective film. did. Similarly, the value obtained by subtracting the measured TD curl value of the optical laminate from which the protective film has been peeled from the measured TD curl value of the polarizing plate from which the protective film has been peeled is obtained as the TD of the optical laminate with the adhesive layer without the protective film The curl value was used.

  The MD curl value and TD curl value obtained in the curl measurements (1) and (2) indicate that reverse curl is suppressed if the value is positive or zero, and the value is negative. In the case of, the larger the absolute value, the more the reverse curl is progressing.

[Preparation of adhesive layer with double-sided separator]
An adhesive was produced by the following method. In a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, a dropping device, and a nitrogen introduction tube, 97.0 parts of n-butyl acrylate, 1.0 part of acrylic acid, 0.5 part of 2-hydroxyethyl acrylate 200 parts of ethyl acetate and 0.08 part of 2,2′-azobisisobutyronitrile were charged, and the air in the reaction vessel was replaced with nitrogen gas. While stirring under a nitrogen atmosphere, the reaction solution was heated to 60 ° C., reacted for 6 hours, and then cooled to room temperature. When the weight average molecular weight of a part of the obtained solution was measured, it was confirmed that 1.8 million (meth) acrylic acid ester polymer was obtained.

  100 parts of the (meth) acrylic acid ester polymer obtained above (in terms of solid content; the same applies hereinafter) and trimethylolpropane-modified tolylene diisocyanate (trade name “Coronate L” manufactured by Tosoh Corporation) as an isocyanate-based crosslinking agent ) 0.30 part and 0.30 part of 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KBM403”) as a silane coupling agent, and sufficiently stirred, A coating solution of the pressure-sensitive adhesive composition was obtained by diluting with ethyl acetate.

  Application of the pressure-sensitive adhesive composition to the release treatment surface (peeling surface) of the first separator (Lintec Corporation: SP-PLR382190) forming the peeling layer with an applicator so that the thickness after drying becomes 25 μm. After coating the solution, it was dried at 100 ° C. for 1 minute to form an adhesive layer. On the surface opposite to the surface of the adhesive layer on which the separator was bonded, another second separator (manufactured by Lintec Corporation: SP) -PLR381031) was bonded to obtain an adhesive layer with a double-sided separator.

[Preparation of adhesive composition]
After mixing the cation curable components a1 to a3 and the cation polymerization initiator shown below, the cation polymerization initiator and the sensitizer shown below are further mixed, and then defoamed to form a photocurable adhesive composition. Was prepared. In addition, the following compounding quantity is based on solid content.
Cationic curable component a1 (70 parts):
3 ′, 4′-epoxycyclohexylmethyl 3 ′, 4′-epoxycyclohexanecarboxylate (trade name: CEL2021P, manufactured by Daicel Corporation)
Cationic curable component a2 (20 parts):
Neopentyl glycol diglycidyl ether (trade name: EX-211, manufactured by Nagase ChemteX Corporation)
Cationic curable component a3 (10 parts):
2-ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase ChemteX Corporation)
Cationic polymerization initiator (2.25 parts (solid content)):
Product name: 50% propylene carbonate solution / sensitizer (2 parts) of CPI-100 (manufactured by San Apro Co., Ltd.):
1,4-diethoxynaphthalene

[Preparation of polarizing plate with protective film (1)]
A 20 μm-thick polyvinyl alcohol film (average polymerization degree of about 2,400, saponification degree of 99.9 mol% or more) was uniaxially stretched by about 5 times by dry stretching and further kept at 60 ° C. while maintaining tension. After being immersed in water for 1 minute, it was immersed in an aqueous solution having a mass ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C. for 60 seconds. Then, it was immersed in an aqueous solution having a mass ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C. for 300 seconds. Subsequently, it was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a 7 μm-thick polarizer in which iodine was adsorbed and oriented on a polyvinyl alcohol film.

  Next, 3 parts of carboxy group-modified polyvinyl alcohol (trade name “KL-318” obtained from Kuraray Co., Ltd.) is dissolved in 100 parts of water on one side of this polarizer, and a water-soluble epoxy resin is dissolved in the aqueous solution. Apply an epoxy adhesive containing 1.5 parts of the polyamide epoxy additive (trade name “Smileise Resin 650 (30)” obtained from Taoka Chemical Co., Ltd., aqueous solution with a solid content of 30%). Then, a transparent norbornene resin film having a thickness of 13 μm was bonded as a protective layer. In this way, a polarizing plate having a protective layer laminated on one side of the polarizer was obtained. Further, a protective film having a 15 μm acrylic adhesive layer formed on a 38 μm thick polyethylene terephthalate (PET) film is bonded to the surface of the norbornene resin film opposite to the polarizer, and a polarizing film with a protective film having a thickness of 73 μm is attached. A plate (1) was obtained. The measured MD curl value of this polarizing plate with a protective film was -20 mm, and the measured TD curl value was 1 mm. The measured MD curl value of the polarizing plate from which the protective film was peeled was 4 mm, and the measured TD curl value was −1 mm.

・溶剤（９５部）：シクロペンタノン [Preparation of first liquid crystal layer with substrate layer and second liquid crystal layer with substrate layer]
(Preparation of photo-alignment layer forming composition (1))
The following components were mixed, and the resulting mixture was stirred at a temperature of 80 ° C. for 1 hour to obtain a photoalignment layer forming composition (1).
-Photo-alignment material (5 parts):

Solvent (95 parts): cyclopentanone

(Preparation of alignment layer forming composition (2))
2-Butoxyethanol was added to Sunever SE-610 (Nissan Chemical Industry Co., Ltd.), which is a commercially available orientation polymer, to obtain an alignment layer forming composition (2). The obtained composition for forming an alignment layer (2) had a solid content of 1% with respect to the total amount of the composition, and a solvent content of 99% with respect to the total amount of the composition. The amount of solid content of Sun Ever SE-610 was converted from the concentration described in the delivery specification.

・重合性液晶化合物Ａ２（２０部）：

・重合開始剤（６部）：
２−ジメチルアミノ−２−ベンジル−１−（４−モルホリノフェニル）ブタン−１−オン（イルガキュア３６９；チバスペシャルティケミカルズ社製）
・溶剤（４００部）：シクロペンタノン (Preparation of liquid crystal layer forming composition (A-1))
The following components were mixed, and the resulting mixture was stirred at 80 ° C. for 1 hour to obtain a liquid crystal layer forming composition (A-1). The polymerizable liquid crystal compound A1 and the polymerizable liquid crystal compound A2 were synthesized by the method described in JP 2010-31223 A.
Polymerizable liquid crystal compound A1 (80 parts):

Polymerizable liquid crystal compound A2 (20 parts):

-Polymerization initiator (6 parts):
2-Dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one (Irgacure 369; manufactured by Ciba Specialty Chemicals)
Solvent (400 parts): cyclopentanone

・重合開始剤（０．５％）：
イルガキュア（登録商標）９０７（ＢＡＳＦジャパン社製）
・反応添加剤（１．１％）：
Ｌａｒｏｍｅｒ（登録商標）ＬＲ−９０００（ＢＡＳＦジャパン社製）
・溶剤（７９．１％）：プロピレングリコール１−モノメチルエーテル２−アセタート (Preparation of liquid crystal layer forming composition (B-1))
The following components were mixed, and the resulting mixture was stirred at 80 ° C. for 1 hour, and then cooled to room temperature to obtain a liquid crystal layer forming composition (B-1).
Polymerizable liquid crystal compound LC242 (manufactured by BASF) (19.2%):

-Polymerization initiator (0.5%):
Irgacure (registered trademark) 907 (BASF Japan)
Reaction additive (1.1%):
Laromer (registered trademark) LR-9000 (manufactured by BASF Japan)
Solvent (79.1%): propylene glycol 1-monomethyl ether 2-acetate

(Production of first liquid crystal layer with a base material layer)
A polyethylene terephthalate (PET) film having a thickness of 100 μm was processed once using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Denki Co., Ltd.) under conditions of an output of 0.3 kW and a treatment speed of 3 m / min. A photo-alignment layer forming composition (1) is applied to the corona-treated surface with a bar coater, dried at 80 ° C. for 1 minute, and a polarized UV irradiation device (SPOT CURE SP-7; manufactured by USHIO INC.) Then, polarized UV exposure was performed with an integrated light amount of 100 mJ / cm ² to obtain a photo-alignment layer. It was 100 nm when the thickness of the obtained photo-alignment layer was measured with the laser microscope (LEXT, Olympus Corporation make). The thickness of the first liquid crystal layer was 2 μm.

Subsequently, the liquid crystal layer-forming composition (A-1) was applied onto the photo-alignment layer using a bar coater, dried at 120 ° C. for 1 minute, and then a high-pressure mercury lamp (Unicure VB-15201BY-A, Ushio). By using ultraviolet light (produced by Denki Co., Ltd.) (under a nitrogen atmosphere, wavelength: 365 nm, integrated light quantity at wavelength 365 nm: 1000 mJ / cm ² ), a first liquid crystal layer as a retardation layer is formed, A first liquid crystal layer with a base material layer was obtained.

(Production of second liquid crystal layer with base material layer)
A polyethylene terephthalate (PET) film having a thickness of 38 μm was treated once using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Denki Co., Ltd.) under conditions of an output of 0.3 kW and a treatment speed of 3 m / min. The alignment layer forming composition (2) was applied to the surface subjected to the corona treatment by a bar coater and dried at 90 ° C. for 1 minute to obtain an alignment layer. It was 34 nm when the thickness of the obtained alignment layer was measured with the laser microscope (LEXT, Olympus Corporation make).

Subsequently, the composition for forming a liquid crystal layer (B-1) was applied onto the alignment layer using a bar coater and dried at 90 ° C. for 1 minute, and then a high-pressure mercury lamp (Unicure VB-15201BY-A, USHIO INC.). The second liquid crystal layer as a retardation layer is formed by irradiating ultraviolet rays (in a nitrogen atmosphere, wavelength: 365 nm, integrated light quantity at wavelength 365 nm: 1000 mJ / cm ² ) using A second liquid crystal layer with a material layer was obtained. The thickness of the second liquid crystal layer was 1 μm.

[Example 1]
Using the first liquid crystal layer with a base material layer, the second liquid crystal layer with a base material layer, and the adhesive layer with a double-sided separator prepared above, an optical laminate with an adhesive layer in the steps shown in FIGS. Got. Specifically, it was performed as follows.

  Corona treatment (800 W, 10 m / min, on the surface opposite to the protective film side (polarizer side) of the polarizing plate with protective film (1) prepared above (length in MD direction: 300 mm × length in TD direction: 200 mm) Bar width 700 mm, 1 Pass). The adhesive composition prepared above was applied using a coating machine (bar coater manufactured by Daiichi Rika Co., Ltd.) so that the thickness of the cured adhesive layer was 1 μm. The layer was formed and the polarizing plate with a composition layer was obtained (refer FIG.1 (c)).

The obtained adhesive composition layer of the polarizing plate with the composition layer and the first liquid crystal layer of the first liquid crystal layer with the base material layer prepared as described above were attached to a sticking device (“LPA3301” manufactured by Fuji Plastics Co., Ltd.). (See Fig. 1 (d)), UV irradiation device with belt conveyor from the protective film side of the polarizing plate with composition layer (the lamp uses "H bulb" manufactured by Fusion UV Systems) Thus, the UVA region is irradiated with ultraviolet rays so that the irradiation intensity is 390 mW / cm ² and the integrated light amount is 420 mJ / cm ^2, and the UVB region is 400 mW / cm ² and the integrated light amount is 400 mJ / cm ^2. The adhesive composition was cured to obtain a first liquid crystal layer laminate with a base material layer (see FIG. 2A). When the storage elastic modulus at room temperature of the adhesive cured layer obtained by curing the adhesive composition layer was calculated by the above-described calculation method, it was about 3000 MPa.

  Subsequently, the PET film (thickness: 100 μm) of the first liquid crystal layer with the base material layer was peeled from the first liquid crystal layer laminate with the base material layer to obtain a first liquid crystal layer laminate (see FIG. 2B). ). Moreover, the 2nd separator was peeled from the adhesive layer (300 mm x 200 mm) with a double-sided separator prepared above. Using an automatic laminating machine HALTEC, the second separator is removed from the surface of the first liquid crystal layer laminate (surface on the first liquid crystal layer side) exposed by peeling the PET film (thickness 100 μm) and the adhesive layer with a double-sided separator. After performing sheet-fed bonding with the peeled and exposed pressure-sensitive adhesive layer, the first separator was peeled off to obtain a first liquid crystal layer laminate with a pressure-sensitive adhesive layer (see FIG. 3B).

  Using the automatic laminating machine HALTEC, the adhesive layer of the first liquid crystal layer laminate with the adhesive layer exposed by peeling the first separator and the second liquid crystal layer of the second liquid crystal layer with the base material layer prepared above are used. Then, the two liquid crystal layer laminates were obtained (see FIG. 4B). The surface (surface on the second liquid crystal layer side) exposed by peeling the PET film (thickness 38 μm) of the second liquid crystal layer with the base material layer from the obtained second liquid crystal layer laminate, and the double-sided separator prepared above The adhesive layer exposed by peeling the second separator from the attached adhesive layer (300 mm × 200 mm) was bonded to a single sheet using an automatic bonding machine HALTEC to obtain an optical laminate (1) with an adhesive layer. (See FIG. 6 (b)). Curl measurements (1) and (2) were performed on the obtained optical layered body with an adhesive layer (1), and MD curl value and TD curl value of the optical layered body with adhesive layer (1) were calculated. The results are shown in Table 1.

[Example 2]
A first liquid crystal layer laminate was obtained in the same procedure as in Example 1 (see FIG. 2B), and the surface of the first liquid crystal layer laminate exposed by peeling the PET film (thickness 100 μm) (first liquid crystal). The surface on the layer side was subjected to corona treatment (800 W, 10 m / min, bar width 700 mm, 1 Pass). On this corona-treated surface, the adhesive composition prepared above was applied using a coating machine (bar coater manufactured by Daiichi Rika Co., Ltd.) so that the thickness of the adhesive cured layer was 1 μm. Thus, an adhesive composition layer was formed. The adhesive composition layer formed on the first liquid crystal layer of the first liquid crystal layer laminate and the second liquid crystal layer of the second liquid crystal layer with the base material layer prepared above are bonded to a bonding device (Fuji Plastic Co., Ltd.). After bonding using “LPA3301” manufactured by the manufacturer, UVA is applied from the second liquid crystal layer side with the base material layer using an ultraviolet irradiation device with a belt conveyor (the lamp uses “H bulb” manufactured by Fusion UV Systems). 390mW / cm ² irradiation intensity in frequency, so that the integrated light quantity becomes 420 mJ / cm ^2, the UVB region 400 mW / cm ^2, so that the integrated light quantity becomes 400 mJ / cm ^2, the adhesive composition is irradiated with ultraviolet light The product was cured to obtain a second liquid crystal layer laminate (see FIG. 5C).

  The surface (surface on the second liquid crystal layer side) exposed by peeling the PET film (thickness 38 μm) of the second liquid crystal layer with the base material layer from the obtained second liquid crystal layer laminate, and the double-sided separator prepared above The pressure-sensitive adhesive layer (300 mm × 200 mm) was peeled off from the adhesive layer exposed by peeling the second separator, and an optical laminate (2) with the pressure-sensitive adhesive layer was obtained by using an automatic bonding machine HALTEC. (See FIG. 6 (b)). Curl measurements (1) and (2) were performed on the obtained optical layered body with an adhesive layer (1), and MD curl value and TD curl value of the optical layered body with adhesive layer (1) were calculated. The results are shown in Table 1.

[Comparative Example 1]
Using the first liquid crystal layer with a base material layer, the second liquid crystal layer with a base material layer, and the adhesive layer with a double-sided separator prepared above, an optical laminate with an adhesive layer was obtained in the steps shown in FIGS. . Specifically, it was performed as follows.

  Corona treatment (800 W, 10 m / min, on the surface opposite to the protective film side (polarizer side) of the polarizing plate with protective film (1) prepared above (length in MD direction: 300 mm × length in TD direction: 200 mm) Bar width 700 mm, 1 Pass). Moreover, the 2nd separator was peeled from the adhesive layer (300 mm x 200 mm) with a double-sided separator prepared above. Using an automatic laminating machine HALTEC, the adhesive layer is obtained by laminating the corona-treated surface of the polarizing plate with a protective film (1) and the adhesive layer exposed by peeling the second separator from the adhesive layer with a double-sided separator. An attached polarizing plate was obtained (see FIG. 7A).

  The adhesive layer exposed by peeling the first separator from the polarizing plate with the adhesive layer, and the first liquid crystal layer of the first liquid crystal layer with the base material layer prepared above (length in the MD direction 300 mm × length in the TD direction 200 mm) Were laminated using an automatic laminating machine HALTEC (see FIG. 7C).

  Subsequently, the surface (the surface on the first liquid crystal layer side) exposed by peeling off the PET film (thickness 100 μm) of the first liquid crystal layer with the base material layer bonded to the polarizing plate with the protective film (2), and the above After peeling the second separator from the prepared double-sided separator-attached adhesive layer (300 mm × 200 mm) and exposing the adhesive layer using an automatic laminator HALTEC, the first separator was further peeled off ( (See FIG. 8 (a)). The adhesive layer exposed by peeling off the first separator, and the second liquid crystal layer of the second liquid crystal layer with the base material layer prepared above (length in the MD direction: 300 mm × length in the TD direction: 200 mm) are automatically bonded. Single layer bonding was performed using HALTEC to obtain an optical laminate with a base material layer (FIG. 8C).

  The surface (the surface on the second liquid crystal layer side) exposed by peeling the PET film (thickness 38 μm) of the second liquid crystal layer with the base material layer from the obtained optical laminate with the base material layer, and the double-sided separator prepared above The adhesive layer exposed by peeling the second separator from the attached adhesive layer (300 mm × 200 mm) was bonded to a single sheet using an automatic bonding machine HALTEC to obtain an optical laminate (3) with an adhesive layer. . The obtained optical layered body with an adhesive layer (3) was subjected to curl measurements (1) and (2) to calculate the MD curl value and the TD curl value of the optical layered body with an adhesive layer (3). The results are shown in Table 1.

  As shown in Table 1, the optical layered body with the adhesive layer obtained in Examples 1 and 2 has the reverse curl suppressed as compared with the optical layered body with the adhesive layer obtained in Comparative Example 1, and the above-mentioned implementation According to the method for producing an optical layered body with an adhesive layer described in the embodiment, it can be seen that reverse curling can be suppressed.

  10, 10p first liquid crystal layer with base material layer, 11, 11p first base material layer, 12, 12p first liquid crystal layer, 20, 20p second liquid crystal layer with base material layer, 21, 21p second base material layer, 22, 22p 2nd liquid crystal layer, 31 1st adhesive hardening layer, 31a 1st adhesive composition layer, 31p 1'th adhesion layer, 32a 2nd adhesive composition layer, 32x 1st adhesion layer, 32y 2nd Adhesive cured layer, 32p second 'adhesive layer, 33 second adhesive layer, 33p third' adhesive layer, 52 first release layer, 52p second 'release layer, 53 second release layer, 53p third' release layer 57 First adhesive layer with release layer, 58 Second adhesive layer with release layer, 60, 60p optical film, 61 Optical film with composition layer, 65 First liquid crystal layer laminate with base material layer, 66 First liquid crystal layer Laminated body, 67 First liquid crystal layer laminated body with adhesive layer, 70, 70 x, 70y, 70p Optical laminated body, 71, 71x, 71y, 71p Optical laminated body with a base material layer (optical laminated body), 80, 81 Optical laminated body with an adhesive layer.

Claims (12)

An optical film, a first adhesive cured layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer are laminated in this order, a method for producing an optical laminate,
The adhesive layer is a first adhesive layer or a second adhesive cured layer,
Preparing a first liquid crystal layer with a base material layer having a first base material layer and the first liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the first base material layer;
Preparing a second liquid crystal layer with a base material layer having a second base material layer and the second liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the second base material layer;
Laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with the base material layer through the first adhesive cured layer to obtain a first liquid crystal layer laminate with the base material layer;
Peeling the first base material layer from the first liquid crystal layer laminate with the base material layer to obtain a first liquid crystal layer laminate;
The first liquid crystal so that the first exposed surface side of the first liquid crystal layer laminate exposed by peeling the first base material layer and the second liquid crystal layer face each other with the adhesive layer interposed therebetween. Laminating the layer laminate and the second liquid crystal layer with the base material layer to obtain a second liquid crystal layer laminate, and a method for producing an optical laminate. The step of obtaining the first liquid crystal layer laminate with the base material layer,
1st adhesion | attachment containing the 1st adhesive composition for forming the said 1st adhesive agent cured layer in at least one by the said 1st liquid crystal layer side of the said optical film and the said 1st liquid crystal layer with a base material layer. Forming an agent composition layer;
After laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with the base material layer via the first adhesive composition layer, the first adhesive composition layer is cured to The method for producing an optical laminate according to claim 1, comprising a step of forming a first cured adhesive layer. The adhesive layer is the first adhesive layer;
The step of obtaining the second liquid crystal layer laminate includes
Forming the first adhesive layer on the first exposed surface of the first liquid crystal layer laminate to obtain a first liquid crystal layer laminate with an adhesive layer;
The process including bonding the first adhesive layer of the first liquid crystal layer laminate with the adhesive layer and the second liquid crystal layer of the second liquid crystal layer with the base material layer. The manufacturing method of the optical laminated body of description. The step of obtaining the first liquid crystal layer laminate with an adhesive layer includes:
Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;
After bonding the first adhesive layer of the first adhesive layer with the release layer and the first exposed surface of the first liquid crystal layer laminate, peeling the first release layer. The manufacturing method of the optical laminated body of Claim 3. The adhesive layer is the first adhesive layer;
The step of obtaining the second liquid crystal layer laminate includes
Forming the first adhesive layer on the second liquid crystal layer of the second liquid crystal layer with the base material layer to obtain a second liquid crystal layer with an adhesive layer;
The optical lamination according to claim 1, comprising a step of bonding the first adhesion layer of the second liquid crystal layer with the adhesion layer and the first exposed surface of the first liquid crystal layer laminate. Body manufacturing method. The step of obtaining the second liquid crystal layer with the adhesive layer includes:
Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;
A step of peeling the first release layer after bonding the first adhesive layer of the first adhesive layer with the release layer and the second liquid crystal layer of the second liquid crystal layer with the base material layer; The manufacturing method of the optical laminated body of Claim 5 containing. The adhesive layer is the second adhesive cured layer,
The step of obtaining the second liquid crystal layer laminate includes
The second adhesive cured layer is formed on at least one of the first exposed surface side of the first liquid crystal layer laminate and the second liquid crystal layer side of the second liquid crystal layer with the base material layer. Forming a second adhesive composition layer comprising a second adhesive composition for
The first liquid crystal layer laminate and the second liquid crystal layer with the base material layer were laminated so that the first exposed surface and the second liquid crystal layer face each other through the second adhesive composition layer. The method for producing an optical laminate according to claim 1, further comprising: curing the second adhesive composition layer to form the second adhesive cured layer.   The said optical film is a manufacturing method of the optical laminated body of any one of Claims 1-7 containing a polarizing plate.   The said optical film is a manufacturing method of the optical laminated body of any one of Claims 1-8 containing the polarizing plate with a protective film by which the protective film was laminated | stacked on the at least single side | surface of the polarizing plate.   Furthermore, the manufacturing method of the optical laminated body of any one of Claims 1-9 including the process of peeling the said 2nd base material layer from a said 2nd liquid crystal layer laminated body. An optical film, a first adhesive cured layer, a first liquid crystal layer, an adhesive layer, a second liquid crystal layer, and a method for producing an optical laminate with an adhesive layer in which a second adhesive layer is laminated in this order,
Preparing an optical laminate produced by the method for producing an optical laminate according to claim 10;
Laminating the second adhesive layer on the second exposed surface side of the optical laminate exposed by peeling off the second substrate layer, and a method for producing an optical laminate with an adhesive layer. The step of laminating the second adhesive layer includes
Preparing a second adhesive layer with a release layer in which the second adhesive layer and the second release layer are laminated;
The optical laminated body with an adhesive layer of Claim 11 including the process of bonding the said 2nd adhesive layer of the said 2nd adhesive layer with a peeling layer, and the said 2nd exposed surface of the said optical laminated body. Production method.

Images