KR20190109267A - Method of manufacturing optical laminate and method of manufacturing optical laminate with adhesive layer - Google Patents

Abstract

The present invention relates to a manufacturing method of an optical laminate in which an optical film, a first adhesive curing layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer are laminated in order, and which comprises the steps of: laminating the optical film on a first liquid crystal layer side of the first liquid crystal layer with a base layer through the first adhesive curing layer to obtain a first liquid crystal layer laminate with the base layer; peeling a first base layer from the first liquid crystal layer laminate with the base layer to obtain the first liquid crystal layer laminate; and laminating the first liquid crystal layer laminate and the second liquid crystal layer with the base layer so that an exposed first surface side of the first liquid crystal layer laminate exposed by peeling the first base layer and the second liquid crystal layer may face through the adhesive layer, thereby obtaining a second liquid crystal layer laminate, wherein the adhesive layer is a first adhesion layer or a second adhesive curing layer.

Description

The manufacturing method of an optical laminated body, and the manufacturing method of an optical laminated body with an adhesion layer {METHOD OF MANUFACTURING OPTICAL LAMINATE AND METHOD OF MANUFACTURING OPTICAL LAMINATE WITH ADHESIVE LAYER}

This invention relates to the manufacturing method of an optical laminated body, and the manufacturing method of the optical laminated body with an adhesion layer.

An organic EL display device using an organic light emitting diode (OLED) is not only lighter and thinner than a liquid crystal display device, but also can realize a high image quality such as a wide viewing angle, fast response speed, and high contrast. It is used in various fields, such as a television and a digital camera. Further, in the organic EL display device, since it is thin and can be displayed without using a backlight, a device shape that is bent or wound around has also been proposed. In organic electroluminescence display, in order to suppress the fall of the visibility by reflection of external light, it is known to improve antireflection performance using a circularly polarizing plate etc.

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 has a phase difference layer formed by using a liquid crystal material. It is described.

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-230386 Patent Document 2: Japanese Patent Application Laid-Open No. 2015-79256

The above-mentioned optical film is required to be thinner and bendable than the conventional one so as not to impair the weight reduction and thinning characteristic of the display device. In addition, although the said optical film is used by bonding to an optical display element, when the so-called reverse curl which curls so that the side joined to an optical display element becomes concave arises, air bubbles will mix when bonding an optical film and an optical display element. There is a tendency that a problem such as being recognized as a stain is likely to occur due to the occurrence of wrinkles or wrinkles. Since such a problem causes a defect of an image display panel, it is calculated | required to suppress the reverse curl of an optical film.

An object of this invention is to provide the manufacturing method which can manufacture the optical laminated body in 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] An optical film, a first adhesive cured layer, a first liquid crystal layer, an adhesive layer, and a second liquid crystal layer, as a method for producing an optical laminated body 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 layer having a first base layer and the first liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the first base layer;

Preparing a second liquid crystal layer with a base layer having a second base layer and the second liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the second base layer;

Laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with base material layer through the first adhesive cured layer to obtain a first liquid crystal layer laminate with base material layer;

Peeling the first base material layer from the first liquid crystal layer laminate with base material layer to obtain a first liquid crystal layer laminate,

The second liquid crystal layer laminate and the second base layer provided with the first liquid crystal layer laminate and the base layer so that the first exposed surface side of the first liquid crystal layer laminate exposed by peeling the first base layer and the second liquid crystal layer face each other through the adhesive layer. The manufacturing method of the optical laminated body containing the process of laminating | stacking a liquid crystal layer and obtaining a 2nd liquid crystal layer laminated body.

[2] The step of obtaining the first liquid crystal layer laminate with base material layer,

A step of forming a first adhesive composition layer containing a first adhesive composition for forming the first adhesive cured layer on at least one side of the first liquid crystal layer side of the first liquid crystal layer with the optical film and the base layer. and,

After laminating the optical film on the side of the first liquid crystal layer of the first liquid crystal layer with a base material layer through the first adhesive composition layer, the first adhesive composition layer is cured to form the first adhesive cured layer The manufacturing method of the optical laminated body as described in [1] containing a process.

[3] The adhesive layer is the first adhesive layer,

The process of obtaining a said 2nd liquid crystal layer laminated body is

Forming a first adhesive layer on the first exposed surface of the first liquid crystal layer laminate to obtain a first liquid crystal layer laminate having an adhesive layer;

Optical lamination as described in [1] or [2] including the process of bonding the said 1st adhesion layer of the said 1st liquid crystal layer laminated body with an adhesion layer and the said 2nd liquid crystal layer of the 2nd liquid crystal layer with a base material layer. Method of making sieves.

[4] The step of obtaining the first liquid crystal layer laminate with a pressure-sensitive adhesive layer,

Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;

The process of peeling the said 1st peeling layer after joining the said 1st adhesion layer of the said 1st adhesion layer with a peeling layer and the said 1st exposed surface of the said 1st liquid crystal layer laminated body is described in [3]. The manufacturing method of one optical laminated body.

[5] The adhesive layer is the first adhesive layer,

The process of obtaining a said 2nd liquid crystal layer laminated body is

Forming a first adhesive layer on the second liquid crystal layer of the second liquid crystal layer with base material layer to obtain a second liquid crystal layer with adhesive layer;

Manufacturing of the optical laminated body as described in [1] or [2] containing the process of bonding the said 1st adhesion layer of the said 2nd liquid crystal layer with an adhesion layer, and the said 1st exposure surface of the said 1st liquid crystal layer laminated body. Way.

[6] The step of obtaining the second liquid crystal layer with a pressure-sensitive adhesive layer,

Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;

[5] comprising the step of peeling the first release layer after bonding the first adhesion layer of the first adhesion layer with the release layer and the second liquid crystal layer of the second liquid crystal layer with the base layer. The manufacturing method of the described optical laminated body.

[7] The adhesive layer is the second adhesive cured layer,

The process of obtaining a said 2nd liquid crystal layer laminated body is

A second adhesive composition for forming the second adhesive cured layer 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 base material layer. Forming a second adhesive composition layer comprising;

After laminating the first liquid crystal layer stack and the second liquid crystal layer with the base layer so that the first exposed surface and the second liquid crystal layer face each other through the second adhesive composition layer, the second adhesive composition layer is formed. The manufacturing method of the optical laminated body as described in [1] or [2] containing the process of hardening | curing and forming a said 2nd adhesive agent hardened layer.

[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 laminate according to any one of [1] to [8], wherein the optical film includes a polarizing plate with a protective film having a protective film laminated on at least one surface of the polarizing plate.

[10] The method for producing an optical laminate according to any one of [1] to [9], further comprising the step of peeling the second substrate 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 the above [10];

The manufacturing method of the optical laminated body with an adhesion layer containing the process of laminating | stacking the said 2nd adhesion layer on the 2nd exposure surface side of the said optical laminated body exposed by peeling the said 2nd base material layer.

[12] The step of laminating the second adhesive layer,

Preparing a second adhesive layer with a release layer in which the second adhesive layer and the second release layer are laminated;

The manufacturing method of the optical laminated body with an adhesion layer as described in [11] containing 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.

According to this invention, the optical laminated body with reverse curl suppressed and the optical laminated body with an adhesion layer can be manufactured.

FIG.1 (a)-(d) are schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body of this invention typically.
FIG.2 (a) and (b) are schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG.
FIG.3 (a) and (b) are schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG.
4A to 4C are schematic cross-sectional views schematically showing the continuation of the manufacturing process of the optical laminate shown in FIG. 3.
FIG.5 (a)-(d) are schematic sectional drawing which shows an example of the manufacturing process of the other optical laminated body of this invention typically.
FIG.6 (a) and (b) are schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body with an adhesion layer of this invention typically.
FIG.7 (a)-(e) are schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body different from this invention typically.
FIG.8 (a)-(d) are schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of the manufacturing method of the optical laminated body of this invention and the manufacturing method of the optical laminated body with an adhesion layer is described with reference to drawings.

Embodiment 1 (Method for Producing Optical Laminate)

1-4 is schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body of this embodiment typically. In the drawings, W represents the width direction. The optical laminated body 70x manufactured by the manufacturing method of the optical laminated body 70x of this embodiment is the optical film 60 and the 1st adhesive bond hardened layer 31 as shown to FIG. 4 (c). The first liquid crystal layer 12, the first 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 consists of the 1st liquid crystal layer 10 with a base material layer shown to FIG. 1 (a), and the 2nd liquid crystal layer 20 with a base material layer shown to FIG. 1 (b). It includes the process of preparation. The 1st liquid crystal layer 10 with a base material layer has the 1st base material layer 11 and the 1st liquid crystal layer 12 which superposed | polymerized and formed on the 1st base material layer 11, and a base material The layered second liquid crystal layer 20 has a second substrate layer 21 and a second liquid crystal layer 22 formed by polymerizing a polymerizable liquid crystal compound on the second substrate layer 21.

The process of preparing the 1st liquid crystal layer 10 with a base material layer is apply | coated and dried on the 1st base material layer 11, the composition for liquid crystal layer formation containing a polymeric liquid crystal compound, and active energy rays, such as an ultraviolet-ray, You may include the process of forming the 1st liquid crystal layer 12 which superposed | polymerized and hardened | cured the polymerizable liquid crystal compound by irradiation. Similarly, the process of preparing the 2nd liquid crystal layer 20 with a base material layer apply | coats and drys the composition for liquid crystal layer formation containing a polymeric liquid crystal compound on the 2nd base material layer 21, and is active, such as an ultraviolet-ray. The process of forming the 2nd liquid crystal layer 22 which superposed | polymerized and hardened 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 bond layer 31 in the optical film 60 is performed. By this process, the optical film 61 with a composition layer can be obtained (FIG. 1 (c)). The optical film 61 with a composition layer laminate | stacks the optical film 60 and the 1st adhesive composition layer 31a as shown to FIG. 1 (c). The step of forming the first adhesive composition layer 31a 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 liquid crystal layer laminated body 65 with a base material layer is obtained by hardening the 1st adhesive composition layer 31a and forming the 1st adhesive bond hardening layer 31 (FIG. 2 (a)). The method of hardening the 1st adhesive composition layer 31a can be suitably selected according to the kind of 1st adhesive composition, etc., For example, active energy ray irradiation, heat processing, addition of a hardening | curing agent, etc. are mentioned. The kind of 1st adhesive composition and its hardening method are mentioned later. The 1st liquid crystal layer laminated body 65 with a base material layer is an optical film 60, the 1st adhesive bond hardened layer 31, the 1st liquid crystal layer 12, and the 1st as shown to FIG. 2 (a). The base material layer 11 is laminated | stacked in this 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)). In the first liquid crystal layer laminate 66, as shown in FIG. 2B, the optical film 60, the first adhesive curing layer 31, and the first liquid crystal layer 12 are laminated in this order. will be.

Next, the 1st adhesion layer 57 with a peeling layer in which the 1st adhesion layer 32x was formed on the 1st release layer 52 is prepared (FIG. 3 (a)). The process of preparing the 1st adhesion layer 57 with an adhesion layer may include the process of forming the 1st adhesion layer 32x by apply | coating, drying, etc. of an adhesive composition on the 1st peeling layer 52. FIG. good. Moreover, you may provide the process of 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 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 exposed by peeling the 1st adhesion layer 32x and the 1st base material layer 11 of the prepared 1st adhesion layer 57 with a peeling layer. After bonding (first exposed surface) (FIG. 3 (b)), the 1st peeling layer 52 is peeled and the 1st liquid crystal layer laminated body 67 with an adhesion layer is obtained (FIG. 4 (a)). The 1st liquid crystal layer laminated body 67 with an adhesion layer is the optical film 60, the 1st adhesive bond layer 31, the 1st liquid crystal layer 12, and the 1st as shown to FIG. 4 (a). The adhesive layer 32x is laminated | stacked in this order.

1st adhesion layer 32x of the 1st liquid crystal layer laminated body 67 with an adhesion layer shown to FIG. 4 (a), and the 2nd liquid crystal layer 20 with base material layer shown to FIG. 1 (b) 2 liquid crystal layer 22 is bonded together, and the 2nd liquid crystal layer laminated body 71x (optical laminated body) shown to FIG. 4 (b) is obtained. As shown in FIG.4 (b), the 2nd liquid crystal layer laminated body 71x is the optical film 60, the 1st adhesive bond hardened layer 31, the 1st liquid crystal layer 12, and the 1st adhesion layer ( 32x), the 2nd liquid crystal layer 22, and the 2nd base material layer 21 are laminated | stacked in this order. The optical laminated body 70x can be obtained by peeling the 2nd base material layer 21 from the obtained 2nd liquid crystal layer laminated body 71x (FIG. 4 (c)).

In the manufacturing method of the above-mentioned optical laminated body 70x, a polymeric compound on the 1st base material layer 11 or the 2nd base material layer 21 (Hereinafter, it may be called a "base material layer."). The first liquid crystal layer 10 with a substrate layer and the second liquid crystal layer 20 with a substrate layer (hereinafter, both may be referred to as a "substrate layer with liquid crystal layer") obtained by polymerization and curing. have. In the liquid-crystal layer with a base material layer, it is usual to apply | coat and dry the composition for liquid-crystal layer formation containing a polymeric liquid crystal compound on a base material layer, and to polymerize and harden a polymeric liquid crystal compound by active energy ray irradiation, such as an ultraviolet-ray, The first liquid crystal layer 12 or the second liquid crystal layer 22 (hereinafter, may be referred to as a "liquid crystal layer" in combination) may be formed. It is estimated that the shrinkage stress which arises at the time of hardening by drying of the apply | coated liquid crystal layer formation and superposition | polymerization of a polymeric liquid crystal compound remains in the liquid crystal layer formed through the process of said application | coating, drying, superposition | polymerization, hardening, etc. Although the above-mentioned shrinkage stress is suppressed by the base material layer in the state of the liquid-crystal layer with a base material layer in which a liquid crystal layer exists on a base material layer, as mentioned above, the base material layer manufactures the optical laminated body 70x. Since it is peeled off, it is thought that the shrinkage stress of a liquid crystal layer is released by peeling of a base material layer. At this time, when the liquid crystal layer is bonded to the optical film, the shrinkage stress released by peeling the substrate layer causes the optical film and the laminate of the liquid crystal layer to bend toward the inside of the liquid crystal layer, thereby deforming the bow (hereinafter, “ May be referred to as "inverted curl."

It is thought that such curling is likely to occur when an adhesive layer that is low in rigidity and easily deformed is used when the optical film 60 and the liquid crystal layer are laminated. For example, as shown in FIGS. 7 and 8, when the optical film is manufactured by sequentially laminating a liquid crystal layer on the optical film through an adhesive layer, the effect of the shrinkage stress of the released liquid crystal layer is exfoliated by peeling the substrate layer. It is estimated that an adhesion layer and an optical film tend to deform | transform, and it is easy to produce reverse curl in an optical laminated body. 7 and 8 are schematic sectional views schematically showing an example of a manufacturing process of an optical laminate different from the manufacturing process of the optical laminate shown in FIGS. 1 to 4.

In the manufacturing method of the optical laminated body 70p shown to FIG. 8 (d), the 1st 'adhesion | attachment of the optical film 61p with the adhesion layer which laminated | stacked the optical film 60p and the 1' adhesion layer 31p first In the layer 31p (FIG. 7 (a)), the 1st liquid crystal layer 10p with base material layer which has the 1st liquid crystal layer 12p formed by superposing | polymerizing and forming a polymeric liquid crystal compound on the 1st base material layer 11p ( The 1st liquid crystal layer 12p side of FIG. 7 (b) is bonded (FIG. 7 (c)). Thereafter, the first base material layer 11p is peeled off (Fig. 7 (d)), and the second 'adhesion formed on the first liquid crystal layer 12p and the second peeling layer 52p exposed by this peeling. The layer 32p is bonded (FIG. 7 (e)), and the 2nd peeling layer 52p is peeled (FIG. 8 (a)). Next, the second liquid crystal layer of the second liquid crystal layer 20p (FIG. 8B) with the base layer having the second liquid crystal layer 22p formed by polymerizing the polymerizable liquid crystal compound on the second base layer 21p. The (20p) side is bonded to the 2nd 'adhesion layer 32p, and the optical laminated body 71p with a base material layer is obtained (FIG. 8 (c)). The 2nd base material layer 21p is peeled from this optical laminated body 71p with base material layers, and the optical laminated body 70p (FIG. 8 (d)) is obtained.

Thus, in the manufacturing process shown in FIG. 7 and FIG. 8, after laminating | stacking the 1st liquid crystal layer 12p on the optical film 60p through the 1st 'adhesion layer 31p, the 1st base material layer 11p is peeled off. After the second liquid crystal layer 22p is laminated on the first liquid crystal layer 12p through the second 'adhesive layer 32p, the second base layer 21p is peeled off. Therefore, in each process of peeling the 1st base material layer 11p and the 2nd base material layer 21p, it is estimated that the shrinkage stress of the 1st liquid crystal layer 12p and the 2nd liquid crystal layer 22p is respectively free | released. . Under the influence of this released shrinkage stress, the first 'adhesive layer 31p, the second' adhesive layer 32p, and the optical film 60p are easily deformed, and reverse curl is likely to occur in the optical laminate 70p. I think.

On the other hand, in the manufacturing method of the optical laminated body 70x of this embodiment shown in FIGS. 1-4, the optical film 60 and the 1st liquid crystal layer 12 pass through the 1st adhesive bond hardened layer 31. FIG. It is stacked. The 1st adhesive bond layer 31 is high in rigidity compared with the 1st adhesion layer 31p, and it is hard to deform | transform. 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 1st liquid crystal layer by the 1st adhesive bond hardening layer 31 is carried out. It is estimated that it is easy to hold | maintain in the state which restrained the shrinkage stress of (12). Therefore, in the manufacturing method of the optical laminated body 70x shown to FIGS. 1-4, the optical laminated body 70p obtained with the reverse curl which generate | occur | produces in the optical laminated body 70x obtained by the manufacturing process shown in FIGS. 7 and 8 is shown. It is thought that it can reduce compared with). By reducing the reverse curl which arises in the optical laminated body 70x, when bonding the optical laminated body with an adhesion layer (after-mentioned) obtained using this optical laminated body 70x to an optical display element, the optical laminated body with an adhesion layer and It is possible to suppress the problem that bubbles are mixed, wrinkles occur, or a bonding miss is formed between the optical display elements.

The inverse curl which arises in an optical laminated body is considered to be easy to be affected by shrinkage stress release by a liquid crystal layer, so that the thickness and rigidity of the optical film 60 contained in an optical laminated body are small. Moreover, since the shrinkage stress which remains in a liquid crystal layer becomes large, so that the thickness and rigidity of a base material layer become large, it is thought that it is easy to be influenced by the shrinkage stress released when peeling a base material layer. 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 thickness of the optical film 60 may be 10 micrometers or more, 350 micrometers or less may be sufficient, 200 micrometers or less may be sufficient, and 150 micrometers or less may be sufficient as it.

In addition, the 1st liquid crystal layer with a base material layer, the 2nd liquid crystal layer with a base material layer, the 1st adhesion layer 57 with a peeling layer, which are used in order to manufacture an optical laminated body in this embodiment, It is preferable that all the film-shaped objects, such as the optical film 60 and the optical film 61 with a composition layer, are long film-like objects, and it is preferable to perform each process, conveying these continuously. The width direction W is a direction orthogonal to the longitudinal direction of a film-shaped object.

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

(Modification 1 of Embodiment 1)

In the above, the 1st adhesive composition layer 31a is provided in the optical film 60, the optical film 61 with a composition layer is obtained, and it is on the 1st adhesive composition layer 31a of this composition layer optical film 61. Although the case where the 1st liquid crystal layer 12 of the 1st liquid crystal layer 10 with a base material layer was laminated | stacked on the example was demonstrated, but the 1st liquid crystal layer 10 of a base material layer with a base material layer was provided through the 1st adhesive composition layer 31a. If the optical film 60 is laminated | stacked on the 1st liquid crystal layer 12 side, and the 1st liquid crystal layer laminated body 65 with a base material layer shown in FIG.2 (a) can be obtained, it is not limited to this. For example, the 1st adhesive composition layer 31a is provided in the 1st liquid crystal layer 12 side of the 1st liquid crystal layer 10 with a base material layer, and the optical film 60 is provided on this 1st adhesive composition layer 31a. After lamination, the first adhesive composition layer 31a may be cured to form the first adhesive cured layer 31.

(Modification 2 of Embodiment 1)

In the above, the 1st adhesion layer 32x is carried out on the 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 using the 1st adhesion layer 57 with a peeling layer shown to Fig.3 (a). Although the case where the 2nd liquid crystal layer 22 of the 2nd liquid crystal layer 20 with a base material layer was laminated on this 1st adhesion layer 32x was demonstrated as an example, the 1st liquid crystal layer laminated body ( If the 1st liquid crystal layer 12 of 66 and the 2nd liquid crystal layer 22 of the 2nd liquid crystal layer 20 with a base material layer can be laminated | stacked through the 1st adhesion layer 32x, it will not be limited to this. . For example, the 1st adhesion layer 32x is attached to the 2nd liquid crystal layer 22 side of the 2nd liquid crystal layer 20 with a base material layer using the 2nd adhesion layer 57 with a peeling layer shown to FIG. 3 (a). The first adhesive layer 32x and the first liquid crystal layer 12 of the first liquid crystal layer laminate 66 may be bonded to each other.

Embodiment 2 (Method for Producing Optical Laminate)

FIG.5 (a)-(d) are schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body of this embodiment typically. In the drawings, W represents the width direction. As for the optical laminated body 70y manufactured by the manufacturing method of the optical laminated body 70y of this embodiment, as shown to FIG. 5 (d), the optical film 60 and the 1st adhesive bond hardened layer 31 are shown. The first liquid crystal layer 12, the second adhesive curing layer 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 member same as the member demonstrated in previous embodiment, and the description is abbreviate | omitted.

In the manufacturing method of the optical laminated body 70y, the 1st liquid crystal layer 10 with a base material layer shown to FIG. 1 (a), and FIG. 1 (b) are shown similarly to the manufacturing method demonstrated in previous embodiment. The process of preparing the 2nd liquid crystal layer 20 with a base material layer is included. Moreover, the process of forming the 1st adhesive composition layer 31a containing the 1st adhesive composition for forming the 1st adhesive bond hardening layer 31 in the optical film 60 is performed, and it shows in FIG.1 (c). The optical film 61 with a composition layer to be obtained is obtained. After using the optical film 61 with a composition layer and the 1st liquid crystal layer 10 with a base material layer, the 1st base material is obtained after obtaining the 1st liquid crystal layer laminated body 65 with a base material layer shown to Fig.2 (a). The layer 11 is peeled off to obtain a first liquid crystal layer laminate 66 (FIG. 2B). The process of preparing the 1st liquid crystal layer 10 with a base material layer, and the 2nd liquid crystal layer with a base material layer, the optical film 61 with a composition layer, the 1st liquid crystal layer laminated body 65 with a base material layer, and the 1st About the process of obtaining the liquid crystal layer laminated body 66, since it is the same as what was demonstrated in previous embodiment, the description is abbreviate | omitted.

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

After laminating the 2nd adhesive composition layer 32a of the obtained 2nd liquid crystal layer 25 with the composition layer and the 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 (FIG. 5 (b)), The 2nd adhesive composition layer 32a is hardened | cured, the 2nd adhesive agent hardened layer 32y is formed, and the 2nd liquid crystal layer laminated body 71y is obtained (FIG. 5 (c)). The method of hardening the 2nd adhesive composition layer 32a can be suitably selected according to the kind of 2nd adhesive composition, etc., For example, active energy ray irradiation, heat processing, addition of a hardening | curing agent, etc. are mentioned. The kind of 2nd adhesive composition and its hardening method are mentioned later. As shown in Fig. 5 (c), the second liquid crystal layer laminate 71y includes the optical film 60, the first adhesive curing layer 31, the first liquid crystal layer 12, and the second adhesive curing layer. 32y, the second liquid crystal layer 22, and the second base layer 21 are laminated in this order. The optical laminated body 70y can be obtained by peeling the 2nd base material layer 21 from the obtained 2nd liquid crystal layer laminated body 71y (FIG. 5 (d)).

In the manufacturing method of the optical laminated body 70y mentioned above, like the previous embodiment, the 1st base material layer 11 and the 2nd base material layer 21 (henceforth, both may be referred to as a "base material layer"). The first liquid crystal layer 10 with a base layer and the second liquid crystal layer 20 with a base layer (hereinafter, collectively referred to as a "base layer liquid crystal layer"). Is used). Therefore, as described in the above embodiment, a reverse curl that bends like a bow may be generated in the laminate of the optical film and the liquid crystal layer with the liquid crystal layer side inward due to the peeling of the base layer.

In the optical laminated body 70y of this embodiment, the optical film 60 and the 1st liquid crystal layer 12 are laminated | stacked through the 1st adhesive bond hardened layer 31, and the 1st liquid crystal layer 12 and the 2nd The liquid crystal layer 22 is laminated through the second adhesive cured layer 32. The 1st adhesive bond layer 31 and the 2nd adhesive bond layer 32 are the 1st adhesion layer 31p and 2nd 'of the optical laminated body 70p obtained at the manufacturing process shown to FIG. 7 and FIG. Compared with the adhesion layer 32p, 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 in FIG.2 (a), and the 2nd liquid crystal layer laminated body (shown in FIG.5 (c) ( Even if the second base material layer 21 is peeled off from 71y), the first liquid crystal layer 12 and the second liquid crystal layer 22 are formed by the first adhesive layer 31 and the second adhesive layer 32. It is estimated that it is easy to hold | maintain shrinkage stress in the state suppressed. Therefore, in the manufacturing method of the optical laminated body 70y of this embodiment, the reverse curl which arises in the optical laminated body 70y is compared with the optical laminated body 70p obtained by the manufacturing process shown to FIG. 7 and FIG. It is thought that it can reduce. By reducing the reverse curl which arises in the optical laminated body 70y, when bonding the optical laminated body with an adhesion layer (after-mentioned) obtained using this optical laminated body 70y to an optical display element, It is possible to suppress the problem that bubbles are mixed, wrinkles, or a bonding miss is formed between the optical display elements.

In addition, the 1st liquid crystal layer with a base material layer, the 2nd liquid crystal layer with a base material layer, the 2nd liquid crystal layer with a composition layer, the base material layer used in order to manufacture an optical laminated body in this embodiment, It is preferable that all the film-shaped objects, such as the optical film 60 and the optical film 61 with a composition layer, are long film-like objects, and it is preferable to perform each process, conveying these continuously. The width direction W is a direction orthogonal to the longitudinal direction of a film-shaped object.

(Modification 1 of Embodiment 2)

As described in the above embodiment, instead of providing the first adhesive composition layer 31a on the optical film 60, the first liquid crystal layer 12 side of the first liquid crystal layer 10 with the base layer is provided. You may provide the 1st adhesive composition layer 31a. In this case, after laminating | stacking the optical film 60 on the 1st adhesive composition layer 31a formed in the 1st liquid crystal layer 12 side of the 1st liquid crystal layer 10 with a base material layer, a 1st adhesive composition layer 31a may be hardened to form the first adhesive curing layer 31.

(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 composition layer 2nd liquid crystal layer 25 is obtained, and this composition layer Although the case where the 2nd adhesive composition layer 32a of the provided 2nd liquid crystal layer 25 and the 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 were laminated was demonstrated as an example, the 2nd base material layer provided 2nd liquid crystal layer laminated | stacked which laminated | stacked the 2nd liquid crystal layer 22 of the liquid crystal layer 20 and the 1st liquid crystal layer 12 of the 1st liquid crystal layer laminated body 66 through the 2nd adhesive agent hardened layer 32 If the sieve 71y (FIG. 5 (c)) can be obtained, it will not be limited to this. For example, the 2nd adhesive composition layer 32a is provided in the 1st liquid crystal layer 12 side of the 1st liquid crystal layer laminated body 66, and this 2nd liquid crystal layer with a 2nd adhesive composition layer 32a and a base material layer is provided. After laminating | stacking the 2nd liquid crystal layer 22 of (20), you may harden | cure 2nd adhesive composition layer 32a, and may form 2nd adhesive agent hardened layer 32y. In addition, the second adhesive composition layer 32a is disposed on both the first liquid crystal layer 12 side of the first liquid crystal layer laminate 66 and the second liquid crystal layer 22 side of the second liquid crystal layer 20 having the base layer. May be formed.

Embodiment 3 (Manufacturing Method of Optical Laminate with Adhesive Layer)

FIG.6 (a) and FIG.6 (b) are schematic sectional drawing which shows an example of the manufacturing process of the optical laminated body with an adhesion layer of this embodiment typically. In the drawings, W represents the width direction. As shown in FIG.5 (b), the optical film 60 and 1st of the optical laminated body 80 with an adhesion layer manufactured by the manufacturing method of the optical laminated body 80 with an adhesion layer of this embodiment are shown. The adhesive agent hardening layer 31, the 1st liquid crystal layer 12, the contact bonding layer 32, the 2nd liquid crystal layer 22, and the 2nd adhesion layer 33 are laminated | stacked in this order. You may have the 2nd peeling layer 53 on the opposite side to the 2nd liquid crystal layer 22 of the 2nd adhesion layer 33. As shown in FIG. The adhesive layer 32 is either the first adhesive layer 32x or the second adhesive cured layer 32y.

The manufacturing method of the optical laminated body 80 with an adhesion layer is the optical laminated body 70x shown to FIG. 4C, or the optical laminated body 70y shown to FIG. 5D (henceforth "optical And a laminate 70 in which the second peeling layer 53 and the second adhesive layer 33 are laminated, as shown in Fig. 6A. The process of preparing the equipped 2nd adhesion layer 58 is included. The process of preparing the 2nd adhesion layer 58 with a peeling layer includes the process of forming the 2nd adhesion layer 33 by apply | coating, drying, etc. of an adhesive composition on the 2nd peeling layer 53. Moreover, as shown in FIG. good. Moreover, you may provide the process of 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.

2nd liquid crystal layer 22 (second of the optical laminated body 70 exposed by peeling the 2nd adhesion layer 33 and the 2nd base material layer 21 of the prepared 2nd adhesion layer 58 with a peeling layer) Exposed surface) is bonded together to obtain an optical laminated body 80 with a pressure-sensitive adhesive layer (Fig. 6 (b)). The optical laminated body 80 with an adhesion layer obtained at this time has the 2nd peeling layer 53. As shown in FIG. When laminating | stacking this optical laminated body 80 with an adhesion layer on an optical display element, the 2nd peeling layer 53 is peeled off, the 2nd adhesion layer 33 and an optical display element are bonded together, and it is set as an image display panel. Can be.

In the optical laminated body 80 with an adhesion layer, the 2nd adhesion layer 33 is bonded to an optical display element, and can be used. In the manufacturing method of the above-mentioned adhesive layer optical laminated body 80, since the optical laminated body 70 in which the reverse curl demonstrated in previous embodiment was suppressed was used, it is the 2nd of the optical laminated body 80 with adhesive layer. The so-called reverse curl curled so that the adhesion layer 33 side becomes concave can be suppressed. Thereby, when joining the optical laminated body 80 with an adhesion layer to an optical display element, the problem that a bubble mixes between a optical laminated body and an optical display element, or a bonding miss arises can be suppressed.

In addition, in this embodiment, it is preferable that 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, are long film-like objects. And it is preferable to perform each process, conveying these continuously. The width direction W is a direction orthogonal to the longitudinal direction of a film-shaped 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, you may implement combining each process of the said embodiment and its modification. Hereinafter, each process common in all embodiment and its modification is demonstrated in detail.

(Optical film)

The 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 semi-transmissive reflective film, a brightness enhancing film, an optical compensation film, Anti-glare film. The optical film may be a single layer structure, or may be a laminated optical film having a multilayer structure of two or more layers. As used herein, the term "polarizer" refers to a layer having a property of transmitting linearly polarized light having an oscillation plane orthogonal to the absorption axis when incident light of non-polarized light is incident.

(Polarizer)

Arbitrary suitable polarizers can be employ | adopted as a polarizer. As used herein, the term "polarizer" refers to a linear polarizer having a property of transmitting linearly polarized light having an oscillation plane orthogonal to the absorption axis when incident of non-polarized light. For example, the resin film which forms a polarizer may be a single layer resin film, or a laminated film of two or more layers may be sufficient as it. The polarizer may be a cured film obtained by orienting a dichroic dye to the polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound.

As a specific example of the polarizer comprised from the resin film of a single layer, polyvinyl alcohol (Hereinafter, it may abbreviate as "PVA") type film, a partially formalized PVA type film, ethylene vinyl acetate copolymerization system part saponification film, etc. The hydrophilic polymer film was subjected to dyeing treatment and stretching treatment with a dichroic substance such as iodine or dichroic dye, and polyene-based alignment films such as dehydration treatment of PVA and dehydrochlorination treatment of polyvinyl chloride. Can be. Since it is excellent in optical characteristics, it is preferable to use the polarizer obtained by dyeing a PVA system film with iodine and uniaxially stretching.

Polyvinyl alcohol-type resin can be manufactured by saponifying polyvinyl acetate type resin. Polyvinyl acetate type resin may be a copolymer of vinyl acetate and the other monomer copolymerizable with vinyl acetate other than polyvinyl acetate which is a homopolymer of vinyl acetate. As another monomer copolymerizable with vinyl acetate, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamide which has an ammonium group, etc. are mentioned, for example.

The saponification degree of polyvinyl alcohol-type resin is about 85-100 mol% normally, Preferably it is 98 mol% or more. The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal, polyvinyl acetal, and the like modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based 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 of forming a polyvinyl alcohol-type resin into a film is not specifically limited, It can form into a film by a well-known method. The film thickness of the polyvinyl alcohol-based resin master film is, for example, about 10 to 100 µm, preferably about 10 to 60 µm, and more preferably about 15 to 30 µm.

As a manufacturing method of another polarizer, a base film is prepared first, a solution of resin, such as a polyvinyl alcohol-type resin, is apply | coated on a base film, drying, etc. which remove a solvent are performed, and a resin layer is formed on a base film. The thing including a process is mentioned. Moreover, a primer layer can be previously formed in the surface in which the resin layer of a base film is formed. As a base film, resin films, such as PET, can be used. As a material of a primer layer, resin etc. which bridge | crosslinked the hydrophilic resin used for a polarizer are mentioned.

Subsequently, if necessary, the amount of solvent such as water in the resin layer is adjusted, and then the base film and the resin layer are uniaxially stretched. Then, the resin layer is dyed with a dichroic dye such as iodine, and the dichroic dye is a resin layer. Adsorption orientation. Subsequently, the washing | cleaning process of wash | cleaning a boric acid aqueous solution is performed by processing the resin layer in which the dichroic dye adsorption-oriented was carried out as needed, and wash | cleaning an aqueous boric acid solution. Thereby, the resin layer with which the dichroic dye was adsorption-oriented, ie, the film of a polarizer, is manufactured. A well-known method can be employ | adopted for each process.

Uniaxial stretching of a base film and a resin layer may be performed before dyeing, may be performed during dyeing, may be performed during boric acid treatment after dyeing, and uniaxial stretching may be performed at each of these plural steps. The base film and the resin layer may be uniaxially stretched in the MD direction (film conveyance direction). In this case, the base film and the resin layer may be uniaxially stretched between rolls having different circumferential speeds, or may be uniaxially stretched using a thermal roll. In addition, the base film and the resin layer may be uniaxially stretched in the TD direction (direction perpendicular to the film conveying direction), and in this case, a so-called tenter method can be used. In addition, dry extending | stretching which extends | stretches in air | atmosphere may be sufficient as extending | stretching of a base film and a resin layer, and wet extending | stretching which extends in the state which swelled the resin layer with the solvent may be sufficient. In order to express the performance of a polarizer, a draw ratio is four times or more, it is preferable that it is five times or more, and especially 5.5 times or more are preferable. Although there is no upper limit in particular of draw ratio, 8 times or less are preferable from a viewpoint of suppressing a break etc ..

The polarizer produced by the said method can be obtained by peeling a base film, after laminating | stacking the protective layer mentioned later. According to this method, further thinning of the polarizer becomes possible.

As a manufacturing method of the polarizer which is a cured film which orientated a dichroic dye to a polymeric liquid crystal compound and superposed | polymerized the polymeric liquid crystal compound, the composition for polarizer formation containing a polymeric liquid crystal compound and a dichroic dye is apply | coated on a base film. And polymerizing and curing the polymerizable liquid crystal compound while maintaining a liquid crystal state to form a polarizer. Thus, the obtained polarizer exists in the state laminated | stacked on the base film, and you may use the polarizer with base film as an optical film. Or after laminating | stacking a base film polarizer and a liquid crystal layer laminated body through a 1st adhesive bond hardening layer, you may peel a base film and use a polarizer as an optical film.

As the dichroic dye, a dye having a property in which the absorbance in the long axis direction of the molecule and the absorbance in the short axis direction can be used can be used. For example, a dye having an absorption maximum wavelength (λ max) in the range of 300 to 700 nm is preferable. Do. As such a dichroic dye, an acridine pigment, an oxazine pigment, a cyanine pigment, a naphthalene pigment, an azo pigment, an anthraquinone pigment, etc. are mentioned, for example, Azo pigment is especially preferable. As an azo dye, a monoazo pigment | dye, a bis azo pigment | dye, a tris azo pigment | dye, a tetrakis azo pigment | dye, a stilbenazo pigment | dye, etc. are mentioned, A bis azo dye and a tris azo pigment | dye are more preferable.

The composition for polarizer formation may contain a polymerization initiator such as a solvent and a photopolymerization initiator, a photosensitizer, a polymerization inhibitor and the like. A polymerizable liquid crystal compound, a dichroic dye, a solvent, a polymerization initiator, a photosensitizer, a polymerization inhibitor and the like contained in the composition for forming a polarizer can be used, for example, Japanese Patent Application Laid-Open No. 2017-102479, Japan What is illustrated by Unexamined-Japanese-Patent No. 2017-83843 can be used. In addition, you may use the thing similar to the compound illustrated as a polymeric liquid crystal compound used in order to obtain the 1st liquid crystal layer and 2nd liquid crystal layer mentioned later as a polymeric liquid crystal compound. Also regarding the method of forming a polarizer using the composition for polarizer formation, the method illustrated by the said publication can be employ | adopted.

It is preferable that it is 2 micrometers or more, and, as for the thickness of a polarizer, it is more preferable that it is 3 micrometers or more. Moreover, the thickness of the said polarizer is 25 micrometers or less, It is preferable that it is 15 micrometers or less, It is more preferable that it is 13 micrometers or less, It is further more preferable that it is 7 micrometers or less. In addition, the upper limit and the lower limit mentioned above can be combined arbitrarily. As the thickness of the polarizer becomes thinner, the rigidity becomes smaller, and thus the stiffness is less likely to be affected by the shrinkage stress of the first liquid crystal layer or the second liquid crystal layer. Thus, when using a small polarizer as the optical film, the optical lamination of the above embodiment The manufacturing method of a sieve and the manufacturing method of the optical laminated body with an adhesion layer can be used suitably.

(Polarizing plate)

A polarizer can make a polarizing plate by laminating | stacking a protective layer on the one or both surfaces through a well-known adhesive layer or an adhesive layer. This polarizing plate is a so-called linear polarizing plate. As a protective layer which can be laminated | stacked on one or both surfaces of a polarizer, the film formed from the thermoplastic resin which is excellent in transparency, mechanical strength, heat stability, moisture barrier property, isotropy, elongation property, etc. is used, for example. As a specific example of such a thermoplastic resin, Cellulose resins, such as a triacetyl cellulose; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; Polyether sulfone resins; Polysulfone resins; Polycarbonate resins; Polyamide resins such as nylon and aromatic polyamides; Polyimide resins; Polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; Cyclic polyolefin resins (also called norbornene-based resins) having cyclo-based and norbornene structures; (Meth) acrylic resins; Polyarylate resins; Polystyrene resins; Polyvinyl alcohol resins, and mixtures thereof. When the protective layers are laminated on both surfaces 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 can suppress reverse curl, even if the polarizing plate which laminated | stacked the protective layer only on one side of the polarizer as an optical film from a thinning viewpoint. Because it is suitable. In addition, in this specification, "(meth) acryl" means that any of acryl or methacryl may be sufficient. "(Meth)", such as (meth) acrylate, is also the same meaning.

In order to improve the adhesiveness with the polarizer which consists of PVA system resin and a dichroism substance, the film formed from a thermoplastic resin may be surface-treated (for example, corona treatment etc.), and may be a thin layer, such as a primer layer (also called a undercoat layer). May be formed.

It is preferable that the protective layer has a water vapor transmission rate of 1 to 1500 g / m 2 · 24 hr at a temperature of 40 ° C. and a humidity of 90% RH. When the water vapor transmission rate of a protective layer exceeds 1500 g / m <2> * 24hr, a curl change with time progress of a polarizing plate may become easy to produce in high temperature, high humidity environment. The lower the moisture permeability of the protective layer, the easier the effect of suppressing the change over time of curl of the polarizing plate is obtained. As for the water vapor transmission rate of the protective layer at 40 degreeC, and humidity of 90% RH, it is more preferable that it is 1000 g / m <2> * 24 hr or less, It is still more preferable that it is 100 g / m <2> * 24 hr or less, It is 10 g / m <2> * 24 hr or less Even more preferred. The water vapor transmission rate can be measured in accordance with JIS Z 0208: 1976.

In addition, when a protective layer is laminated | stacked on both surfaces of a polarizer, the moisture permeability of the outer protective layer laminated | stacked on the visual recognition side when an optical laminated body and an optical laminated body with an adhesion layer are bonded to an optical display element, and laminated | stacked on the 1st adhesion layer side It is preferable that the moisture permeability of an inner side protective layer is the same, or it becomes smaller than an inner side protective layer. Thereby, especially when moisture is added during storage of the polarizing plate, the flat shape can be maintained, or the inner protective layer can be swollen, and the polarizing plate can be curled to the normal curl side. It is easy to do it in a curled state. Moreover, as for the water vapor transmission rate of an outer protective layer, it is more preferable that it is 10 g / m <2> * 24hr or less. Thereby, even if the polarizing plate in which the protective layer was laminated only on one side of a polarizer, curl control is possible and the dimensional change (deformation) with time is suppressed even after an optical laminated body or an optical laminated body with an adhesion layer is bonded to an optical display element. can do.

Furthermore, in order to reduce the influence of the shrinkage stress of a 1st liquid crystal layer and a 2nd liquid crystal layer further, and to suppress the static curl which arises in an optical laminated body or an optical laminated body with an adhesion layer, it is laminated | stacked on a polarizer in a polarizing plate used as an optical film. It is desirable to increase the rigidity of the protective layer. Rigidity is defined here as the product of the film thickness multiplied by the tensile modulus of elasticity (hereinafter, sometimes referred to as "23 degreeC elastic modulus") at room temperature (23 ° C) of the film used for the protective layer. For example, it is preferable that the protective layer using the cellulose polymer represented by triacetyl cellulose has a 23 degreeC elasticity modulus of 3000-5000 MPa, and the protective layer using the acrylic polymer represented by polymethyl methacrylate is 23 degreeC. It is preferable that the elastic modulus is in the range of 2000 to 4000 MPa, and the protective layer using the cycloolefin-based polymer having a norbornene structure has a 23 ° C elastic modulus of preferably 2000 to 4000 MPa. From the viewpoint of the moisture permeability and rigidity, an acrylic polymer or a polyolefin polymer is suitably used for the outer protective layer, and it is particularly preferable to use a cycloolefin polymer.

The protective layer may be, for example, an extension of the above-mentioned thermoplastic resin or may not be an extension (hereinafter may be referred to as "unstretched resin"). Examples of the stretching treatment include uniaxial stretching and biaxial stretching.

The extending | stretching direction in an extending | stretching process may be the longitudinal direction of unstretched resin, the direction orthogonal to a longitudinal direction, and the direction which cross | intersects the longitudinal direction may be sufficient as it. In the case of uniaxial stretching, what is necessary is just to extend | stretch an unstretched resin in either of these directions. Biaxial stretching may be simultaneous biaxial stretching which draws simultaneously in two extending directions among these directions, or sequential biaxial stretching which draws in a different direction after extending | stretching in a predetermined direction may be sufficient as it.

An extending | stretching process is extending | stretching in a longitudinal direction using two or more pairs of nip rolls which made the circumferential speed of the downstream side large, or extending | stretching in the direction orthogonal to a longitudinal direction by holding both ends of an unstretched resin by a chuck, etc. I can do it. At this time, desired phase difference value and wavelength dispersion can be controlled by adjusting the thickness of the thermoplastic resin after extending | stretching, or adjusting draw ratio.

It is preferable that the stretched thermoplastic resin 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 590 nm, 450 nm and 550 nm, respectively, and Rth (590) is the thickness at measurement wavelength 590 nm. Directional phase difference value is shown. These in-plane retardation value and thickness direction retardation value mean the value measured in the environment of the temperature of 23 degreeC, and 55% of a relative humidity.

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

(S1) Re = (nx-ny) × d

(S2) Rth = [{(nx + ny) / 2} -nz] × d

It is preferable that said outer protective layer is the stretched thermoplastic resin which satisfy | fills said Formula (1)-Formula (3). The outer protective layer is preferably bonded to the polarizer so as to have a slow axis in a direction intersecting with the absorption axis of the polarizer. For example, the angle of the slow axis of the outer protective layer is 45 ± 10 ° with respect to the absorption axis of the polarizer. It is preferable to bond an outer protective layer and a polarizer so that it may be set to 135 +/- 10 degrees. When the angle of the slow axis is within the above range, a difference is generated between the phase of the light in the fast axis direction and the phase of the light in the slow axis direction. Therefore, when the optical laminated body of the present embodiment is applied to the optical display element, the optical Light emitted through the laminate can be circularly polarized light. Therefore, the display apparatus which applied the optical laminated body of this embodiment to the optical display element can be made excellent in visibility even when seeing a display image etc. over polarized sunglasses.

It is preferable that it is 3 micrometers or more, and, as for the thickness of a protective layer, it is more preferable that it is 5 micrometers or more. Moreover, it is preferable that it is 50 micrometers or less, and, as for the thickness of a protective layer, it is more preferable that it is 30 micrometers or less. In addition, the upper limit and the lower limit mentioned above can be combined arbitrarily. As the thickness of the polarizing plate becomes thinner, the stiffness decreases, and since it is easy to be affected by the shrinkage stress of the first liquid crystal layer or the second liquid crystal layer, the optical laminated body of the embodiment described above is used when a small polarizing plate is used as the optical film. The manufacturing method and the manufacturing method of the optical laminated body with an adhesion layer can be used suitably.

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

The hard coat layer is for the purpose of preventing scratches on the surface of the polarizing plate, and the like. For example, the hard coat layer may be formed by a method of adding a cured film having excellent hardness, sliding properties, etc., by an ultraviolet curable resin such as acrylic or silicone to the surface of the protective layer. Can be. An antireflection layer aims at preventing reflection of external light on the surface of a polarizing plate, and can be achieved by formation of a conventional antireflection film or the like. In addition, a sticking prevention layer aims at preventing adhesion with an adjacent layer.

The antiglare layer is intended to prevent external light from reflecting off the surface of the polarizing plate and to impede visibility of the transmitted light of the polarizing plate. The antiglare layer is, for example, a roughening method using a sand blasting method or an embossing method or transparent. By a method such as a compounding method of fine particles, a fine concavo-convex structure can be provided on the surface of the protective layer and formed. Examples of the transparent fine particles used for imparting the fine concavo-convex structure to the surface of the protective layer include conductivity such as silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide having an average particle diameter of 0.5 to 50 µm. Fine particles such as inorganic fine particles, organic fine particles such as crosslinked or uncrosslinked polymers, and the like. Content of transparent fine particles is 2-50 mass parts normally with respect to 100 mass parts of resin which forms the layer which forms a fine uneven structure, and 5-25 mass parts is preferable. The antiglare layer may also serve as a diffusion layer (visual magnification function or the like) for diffusing the transmitted light of the polarizing plate to enlarge the time and 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. When thickness is less than 0.5 micrometer, there exists a tendency which becomes difficult to prevent the damage of the surface of a polarizing plate effectively. Moreover, when thickness exceeds 10 micrometers, hardening shrinkage may become large and the reverse curl of a polarizing plate may become difficult to be suppressed.

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 a polarizing plate may be 10 micrometers or more, 150 micrometers or less may be sufficient, 120 micrometers or less may be sufficient, and 80 micrometers or less may be sufficient as it.

It is preferable that the measured MD cultivation and the measured TD cultivation of the polarizing plate which peeled the protective film from the polarizing plate with a protective film measured by the method as described in the Example mentioned later are each independently -40 mm or more and 40 mm or less. It is more preferable that it exists in the range of -30 mm or more and 35 mm or less, and it is still more preferable to exist in the range which is -20 mm or more and 30 mm or less. When the said measured MD cultivation and the measured TD cultivation are out of the said range, it exists in the tendency for a polarizing plate to become a cylindrical shape, and it becomes difficult to obtain a curl shape. In addition, if the measured MD cultivation and the measured TD cultivation of the polarizing plate with a protect film mentioned later differ from the measured MD cultivation and the measured TD cultivation of a polarizing plate, a float will generate | occur | produce between a protective film and a polarizing plate, or a clearance gap will be provided between a protective film and a polarizing plate. This is undesirable because tunneling occurs.

(Polarizing plate with protect film)

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

As resin which comprises the resin film for protective films, For example, Polyolefin resin like polyethylene resin and polypropylene resin; Cyclic polyolefin resins; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; Polycarbonate resins; (Meth) acrylic-type resin etc. are mentioned. Among these, polyester-based resins, such as polyethylene terephthalate, are preferable. Although the single layer structure may be sufficient as the resin film for protective films, it may have a multilayer structure of two or more layers.

As an adhesive which comprises the adhesive layer for protective films, the same thing as the adhesive which comprises the adhesive layer mentioned later can be used. In addition, a protective film can form an adhesion layer by apply | coating an adhesive composition, drying, etc. on the resin film surface for protective films. As needed, in order to improve adhesiveness, the adhesive coating surface of the resin film for protective films may be surface-treated (for example, corona treatment etc.), and thin layers, such as a primer layer (also called a undercoat layer), may be formed. Moreover, you may have a peeling layer for covering and protecting the surface on the opposite side to the resin film side for a protective film of the adhesive layer for a protective film as needed. This peeling layer can be peeled off at an appropriate timing when bonding with a polarizing plate.

In the manufacturing process of the polarizing plate with a protective film which bonds a protective film to a polarizing plate, by providing a difference of tension and the difference of a circumferential speed, you can provide a normal curl in the longitudinal direction of the protective film with a polarizing plate. 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 protective film polarizing plate as an optical film, it uses the protective film polarizing plate in the manufacturing process of a protective film polarizing plate. By providing a static curl, it can be expected to make it easier to suppress the reverse curl of an optical laminated body and an optical laminated body with an adhesion layer.

As for the polarizing plate with a protect film, it is preferable that the measured MD cult and the measured TD culch of the protective film with polarizing plate measured by the method as described in the Example mentioned later are respectively independently -40 mm or more and 40 mm or less, and are -30 mm. It is more preferable to exist in the range of 35 mm or more, and it is more preferable to exist in the range of -20 mm or more and 30 mm or less. When the said measured MD cultivation and the measured TD cultivation are out of the said range, there exists a tendency for a protective film equipped polarizing plate to become cylindrical shape, and it becomes difficult to obtain a curl shape. In addition, when the polarizing plate with the protective film is processed to a predetermined size and bonded to the optical display element, it is difficult to properly maintain the suction device of the bonding apparatus or the like. It is not preferable because it tends to.

Since the rigidity becomes small, so that the thickness of a polarizing plate with a protective film becomes thin, and it becomes easy to be influenced by the shrinkage stress of a 1st liquid crystal layer or a 2nd liquid crystal layer, when using a small polarizing plate as an optical film, the said embodiment The manufacturing method of the optical laminated body of this, and the manufacturing method of the 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 32 micrometers-500 micrometers in thickness of a protective film It is suitable for the following cases. 40 micrometers or more may be sufficient as the thickness of a protective film, 350 micrometers or less may be sufficient, 200 micrometers or less may be sufficient, and 150 micrometers or less may be sufficient as it.

(Adhesive layer)

A 1st adhesion layer and a 2nd adhesion layer (henceforth, these may be collectively called "adhesive layer") mean the layer comprised from an adhesive. In this specification, an "adhesive" is a flexible rubber type, expresses adhesiveness by attaching itself to adherends such as an optical film or a liquid crystal layer, and is called a pressure-sensitive adhesive. In addition, an 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, and for example, an adhesive having a base polymer such as acrylic, urethane, silicone, polyvinyl ether, or the like can be used. Moreover, an active energy ray hardening-type adhesive, a thermosetting adhesive, etc. may be sufficient. Among these, the adhesive which used acrylic resin which is excellent in transparency, adhesive force, repeelability (henceforth a reworking property), weather resistance, heat resistance, etc. as a base polymer is suitable. It is preferable that the adhesion layer is comprised from the reaction product of the adhesive composition containing (meth) acrylic-type resin (1), a crosslinking agent (2), and a silane compound (3), and may contain the other component (4).

((Meth) acrylic resin (1))

The (meth) acrylic-type resin (1) contained in an adhesive composition has a structural unit (henceforth a "structural unit (I)") derived from the (meth) acrylic-acid alkylester represented by following formula (I). It is preferable that it is a polymer (Hereinafter, it is also called a "(meth) acrylic acid ester polymer.) Which makes it (for example, 50 mass% or more is included.). In the present specification, "derived" means that the chemical structure changes because compounds such as alkyl (meth) acrylates are polymerized.

[In formula, R <^10> represents a hydrogen atom or a methyl group, R <^20> represents a C1-C20 alkyl group, the said alkyl group may have a linear, branched, or cyclic structure, and the hydrogen atom of the said alkyl group is It may be substituted with an alkoxy group having 1 to 10 carbon atoms.]

As (meth) acrylic acid ester represented by Formula (I), for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, 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, isoboroyl (meth) acrylate, stearyl (meth) acrylate, t-butyl (meth ) Acrylates and the like. Specific examples of the alkoxy group-containing alkyl acrylate include 2-methoxyethyl (meth) acrylate, ethoxymethyl (meth) acrylate, and the like. Especially, it is preferable to contain n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate, and it is especially preferable to contain n-butyl (meth) acrylate.

The (meth) acrylic acid ester polymer may contain the structural unit derived from other monomers other than a structural unit (I). The structural unit derived from another monomer may be 1 type, or 2 or more types may be sufficient as it. As another monomer which a (meth) acrylic acid ester polymer can contain, the monomer which has a polar functional group, the monomer which has an aromatic group, and an acrylamide type monomer are mentioned.

As a monomer which has a polar functional group, the (meth) acrylate which has a polar functional group is mentioned. As a polar functional group, a hydroxyl group, a carboxy group, a substituted amino group, an unsubstituted amino group, etc. are mentioned. Examples of the polar functional group include heterocyclic groups such as epoxy groups.

Content of the structural unit derived from the monomer which has a polar functional group in a (meth) acrylic acid ester polymer becomes like this. Preferably it is 20 mass parts or less, More preferably, 0.1 with respect to 100 mass parts of all the structural units of a (meth) acrylic acid ester polymer. 20 mass parts or more by mass, More preferably, they are 0.1 mass part or more and 10 mass parts or less, Especially preferably, they are 0.5 mass part or more and 10 mass parts or less.

As a monomer which has an aromatic group, (meth) acrylic acid ester which has one (meth) acryloyl group and one or more aromatic rings (for example, a benzene ring, a naphthalene ring etc.) in a molecule | numerator, and has a phenyl group, a phenoxyethyl group, or a benzyl group Can be mentioned.

Content of the structural unit derived from the monomer which has an aromatic group in a (meth) acrylic acid ester polymer becomes like this. Preferably it is 50 mass parts or less, More preferably, 4 mass parts with respect to 100 mass parts of all the structural units of a (meth) acrylic acid ester polymer. 50 parts by mass or more and more 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 -Methyl propoxymethyl) acrylamide etc. are mentioned. By including these structural units, the bleeding out of additives such as an antistatic agent described later can be suppressed.

Furthermore, as a structural unit derived from monomers other than a structural unit (I), the structural unit derived from a styrene monomer, the structural unit derived from a vinyl monomer, and the monomer which has several (meth) acryloyl group in a molecule | numerator The structural unit derived from may be included.

It is preferable that the weight average molecular weight (henceforth simply "Mw") of (meth) acrylic-type resin (1) is 500,000-2,500,000. If 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 a weight average molecular weight is 2.5 million or less, the operability at the time of coating the coating liquid containing an adhesive composition becomes favorable. The molecular weight distribution (Mw / Mn) represented by the ratio of a weight average molecular weight (Mw) and a number average molecular weight (henceforth simply "Mn") is 2-10 normally. In this specification, "weight average molecular weight" and "number average molecular weight" are polystyrene conversion values measured by the gel permeation chromatography (GPC) method.

When the (meth) acrylic resin (1) is dissolved in ethyl acetate to form a solution having a concentration of 20% by mass, the viscosity at 25 ° C is preferably 20 Pa · s or less, more preferably 0.1 to 15 Pa · s. desirable. If the viscosity at 25 degrees C of (meth) acrylic resin (1) is in the said range, it will contribute to rework property. The said viscosity can be measured with a Brookfield viscometer.

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

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

(Cross-linking system (2))

It is preferable that the adhesive composition which forms an adhesion layer contains the crosslinking agent (2). As a crosslinking agent (2), a conventional crosslinking agent (for example, an isocyanate compound, an epoxy compound, an aziridine compound, a metal chelate compound, a peroxide etc.) is mentioned, Especially an isocyanate type from a viewpoint of the pot life of a adhesive composition, a crosslinking rate, etc. It is preferable that it is a compound.

As the isocyanate compound, a compound having at least two isocyanato groups (-NCO) in the molecule is preferable, and examples thereof include aliphatic isocyanate compounds (such as hexamethylene diisocyanate) and alicyclic isocyanate compounds (such as isophorone diisocyanate). ), Hydrogenated xylene diisocyanate, hydrogenated diphenylmethane diisocyanate, aromatic isocyanate compounds (e.g., tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, triphenylmethane triisocyanate, etc.) Can be. Moreover, the crosslinking agent (2) is an adduct (adduct) by the polyhydric alcohol compound of the said isocyanate compound (for example, an adduct by glycerol, trimethylolpropane, etc.), an isocyanurate, a biuret type compound, a polyether Derivatives, such as a urethane prepolymer type isocyanate compound which carried out addition reaction with polyol, polyester polyol, acryl polyol, polybutadiene polyol, polyisoprene polyol, etc. may be sufficient. The crosslinking agent (2) can be used individually or in combination of 2 or more types. Among these, tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, these polyhydric alcohol compounds, or these isocyanurate compounds are preferable from a viewpoint of durability.

The ratio of the crosslinking agent (2) may be, for example, 0.01 to 10 parts by mass, preferably 0.1 to 3 parts by mass, and more preferably 0.1 to 1 part by mass with respect to 100 parts by mass of the (meth) acrylic resin (1). If it is below the said upper limit, it is advantageous for the improvement of durability, and if it is above the said lower limit, generation | occurrence | production of gas is suppressed and it is advantageous for improvement of rework property.

(Silane compound (3))

The pressure-sensitive adhesive composition contains the silane compound (3). By containing a silane compound (3), the adhesiveness of the adhesion layer and the layer laminated can be improved. You may use 2 or more types of silane compounds (3).

As the silane compound (3), for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltri Ethoxydisilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylethoxydimethylsilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-chloropropylmethyldimeth And methoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, and the like.

In addition, the silane compound (3) may contain 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 parts, More preferably, It is 0.05-2 mass parts, More preferably, it is 0.1-1 mass part. When content of a silane compound (3) is 0.01 mass part or more, adhesiveness with a to-be-adhered layer, such as an optical film or a liquid crystal layer, will improve easily. If content is 10 mass parts or less, the bleed out of the silane compound (3) from an adhesion 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 tackifying resin (tackifier), a plasticizer, a weathering stabilizer, a softener, a dye, a pigment, Additives, such as an inorganic filler and resin other than an acrylic resin, can be included individually or 2 types or more.

(Active energy ray curable pressure sensitive adhesive)

It is also useful to mix | blend ultraviolet curable compounds, such as polyfunctional acrylate, with an adhesive composition, to form an adhesive layer, to irradiate and harden | cure ultraviolet-ray, and to make it a harder adhesive layer, and an active energy ray hardening-type adhesive can be used. The "active energy ray hardening-type adhesive" has the property to harden | cure it by irradiation of energy rays, such as an ultraviolet-ray and an electron beam. Since the activated energy ray-curable pressure sensitive adhesive has adhesiveness even before energy ray irradiation, it is an adhesive having the property of being able to adhere to adherends such as an optical film or a liquid crystal layer, and to be cured by irradiation of energy rays to adjust the adhesion.

The active energy ray-curable pressure sensitive adhesive generally contains an acrylic pressure sensitive adhesive and an energy ray polymerizable compound as main components. Usually, a crosslinking agent is further mix | blended, and also a photoinitiator, a photosensitizer, etc. can also be mix | blended as needed.

It is preferable that the storage elastic modulus is 0.10-10.0 Mpa, and, as for an adhesion layer, it is more preferable that it is 0.15-5.0 Mpa. When the storage modulus at 23 ° C. is 0.10 MPa or more, it is preferable because problems such as peeling off 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, it is preferable that it is 10.0 Mpa or less. In addition, the storage elastic modulus of an adhesion layer can be measured with a commercially available viscoelasticity measuring apparatus, for example, the viscoelasticity measuring apparatus "DYNAMIC ANALYZER RDA II" by REOMETRIC.

It is preferable that it is 3 micrometers or more, and, as for the thickness of an adhesion layer, it is more preferable that it is 5 micrometers or more. Moreover, it is preferable that it is 40 micrometers or less, and, as for the thickness of an adhesion layer, it is more preferable that it is 30 micrometers or less. In addition, the upper limit and the lower limit mentioned above can be combined arbitrarily.

(Adhesive Curing Layer)

A 1st adhesive bond layer and a 2nd adhesive bond layer (henceforth, these may be called a "adhesive bond layer") mean the layer formed by hardening the curable component in an adhesive composition. Examples of the adhesive composition for forming the adhesive cured layer include adhesives other than pressure-sensitive adhesives (adhesives), and examples thereof include an aqueous adhesive and an active energy ray curable adhesive. As an aqueous adhesive agent, the adhesive agent which melt | dissolved or disperse | distributed polyvinyl alcohol-type resin in water is mentioned, for example. Examples of the active energy ray curable adhesive include a solvent-free active energy ray curable adhesive containing a curable compound that is cured by irradiation of active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. By using the non-solvent type active energy ray curable adhesive, the adhesiveness between layers can be improved. On the other hand, if the active energy ray-curable adhesive contains a solvent (especially an organic solvent), sufficient adhesiveness cannot be obtained even if the curable components contained in the adhesive are the same, and when the optical laminate is cut to a predetermined size, It is easy to cause problems such as peeling at the end. Moreover, since the process of drying a solvent is added, additional shrinkage stress by heat may apply, and there exists a possibility that a reverse curl may generate | occur | produce easily in an optical laminated body or an optical laminated body with an adhesion layer.

In the case of using a solvent-free active energy ray curable adhesive containing a curable compound cured by irradiation of an active energy ray, the stiffness obtained by multiplying the thickness by the storage elastic modulus, which is an index indicating the hardness of the activated energy ray curable adhesive after curing, is measured. It is often higher than the rigidity of the water-based adhesive. If the rigidity of the adhesive cured layer provided between the first liquid crystal layer and the second liquid crystal layer is high, it is possible to prevent the progression of the curl due to the shrinkage stress at the time of peeling the substrate, so that the use of a solvent-free activated energy ray curable adhesive It is preferable.

Since an active energy ray curable adhesive agent has favorable adhesiveness, it is preferable to include either one or both of a cationically polymerizable curable compound and a radically polymerizable curable compound. The active energy ray curable adhesive may further include a cationic polymerization initiator or a radical polymerization initiator for starting the curing reaction of the curable compound.

Examples of the cationic polymerizable curable compound include epoxy compounds (compounds having one or two or more epoxy groups in the molecule), oxetane compounds (compounds having one or two or more oxetane rings in the molecule), or a combination thereof. Can be mentioned.

Examples of the radically polymerizable curable compound include (meth) acrylic compounds (compounds having one or two or more (meth) acryloyloxy groups in the molecule), other vinyl compounds having radically polymerizable double bonds, or these Combinations.

The active energy ray-curable adhesive may contain a sensitizer as necessary. By using a sensitizer, reactivity is improved and the mechanical strength and adhesive strength of an adhesive layer can be improved further. 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.

The active energy ray-curable adhesive may contain additives such as an ion trap agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, an antifoaming agent, an antistatic agent, a leveling agent, a solvent and the like as necessary. have.

You may form an adhesive composition layer by apply | coating an adhesive composition to the bonding surface of a 1st liquid crystal layer with a base material layer, or a 2nd liquid crystal layer with a base material layer. As the coating method, a conventional 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 adopted.

The drying method in the case of using the water-based adhesive is not particularly limited. For example, a drying method using a hot air dryer or an infrared dryer can be adopted.

When an active energy ray curable adhesive agent is used, active energy rays such as ultraviolet rays, visible light, electron beams and X-rays are irradiated to cure the adhesive composition layer to form an adhesive cured layer. As an active energy ray, an ultraviolet-ray is preferable, As a light source in this case, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultra high pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, etc. can be used.

When hardening an adhesive composition layer by ultraviolet irradiation, the light irradiation intensity of an ultraviolet-ray is determined for every composition of an adhesive composition, Although it does not specifically limit, It is preferable that it is 10-1,000 mW / cm <2>, and it is 100-600 mW / cm <2>. It is more preferable that is. When the intensity of light irradiation 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 adhesive cured layer obtained by the heat radiated from the light source and the heat generated during the polymerization of the adhesive composition. May cause yellowing. Moreover, there is also a possibility of generating shrinkage stress further by the heat radiated from the light source. Irradiation intensity is the intensity | strength in the wavelength range effective for the activation of a polymerization initiator, Preferably a photocationic polymerization initiator, More preferably, it is the intensity | strength in the wavelength range of 400 nm or less, More preferably, the wavelength is 280- It is the intensity in the wavelength range of 320 nm. It is preferable to set it so that it may irradiate once or several times by such light irradiation intensity | strength, and the accumulated light amount may be 10 mJ / cm <2> or more, Preferably it is 100-1,000 mJ / cm <2>, More preferably, it is 200-600 mJ / cm <2>. . When the accumulated light amount to the adhesive composition layer is less than 10 mJ / cm 2, generation of active species derived from the polymerization initiator is not sufficient, and curing of the adhesive composition layer is insufficient. When accumulated light amount exceeds 1,000 mJ / cm <2>, irradiation time becomes very long and it becomes disadvantageous for productivity improvement. Moreover, there is also a possibility of generating shrinkage stress further by the heat radiated from the light source. Depending on the kind 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, and the like, the wavelength (UVA (320-390 nm) and UVB (280-280) at the time of light irradiation 320 nm), etc.) are different, and the amount of accumulated light required also changes according to the wavelength at the time of light irradiation.

What is necessary is just to select so that it may coat by arbitrary application methods as a viscosity of an active energy ray hardening-type adhesive agent, It is preferable that the viscosity in the temperature of 25 degreeC exists in the range of 10-1,000 mPa * sec, and it is 20-500 mPa * sec It is more preferable to exist in the range of. If the viscosity is too small, it tends to be difficult to form an adhesive cured layer of a desired thickness. On the other hand, when the viscosity is too large, the active energy ray-curable adhesive becomes difficult to flow during coating, and it tends to be difficult to obtain a homogeneous coating film without spots. The viscosity here is a value measured at 10 rpm after temperature-controlling the adhesive agent at 25 degreeC using an E-type viscosity meter.

The storage modulus at a temperature of 30 ° C. of the adhesive cured layer is preferably 100 MPa or more, more preferably 1000 MPa or more, and more preferably 1500 MPa or more from the viewpoint of the durability of the polarizing plate which is an optical film and suppression of reverse curl. And particularly preferably at least 2000 MPa. On the other hand, when the storage elastic modulus of an adhesive hardened layer is too big | large, an adhesive hardened layer will become hard too much, and the workability at the time of performing punching processing etc. for making an optical laminated body or an optical laminated body with an adhesion layer into a predetermined magnitude | size may fall. have. For this reason, the storage elastic modulus at the temperature of 30 degreeC of an adhesive bond hardening layer becomes like this. Preferably it is 10000 MPa or less, More preferably, it is 8000 MPa or less, More preferably, it is 5000 MPa or less.

The storage elastic modulus at the temperature of 30 degreeC of an adhesive bond hardening layer can be computed by the following procedure. On one surface of the cyclic polyolefin resin film having a thickness of 50 µm, the above-described active energy ray-curable adhesive is coated using a coating machine (bar coater, manufactured by Daiichi Rika Co., Ltd.), and further on the coated surface. 50 micrometers cyclic polyolefin type resin film is laminated | stacked. Subsequently, by "D bulb" by Fusion UV Systems, ultraviolet rays are irradiated so that accumulated light amount may be 1500 mJ / cm <2> (UVB), and an adhesive composition layer is hardened. This is cut | disconnected to the magnitude | size of 5 mm x 30 mm, one cyclic polyolefin type resin film is peeled off, and the adhesive bond layer with resin film is obtained. The resin cured adhesive layer with a resin film was gripped at a gripper interval of 2 cm using a dynamic viscoelasticity measuring device "DVA-220" manufactured by Aitikei Soksei Co., Ltd. The temperature is raised by setting the frequency at 10 Hz and the temperature increase rate at 10 ° C./min, and the storage modulus at a temperature of 30 ° C. is obtained.

It is preferable that the thickness of an adhesive bond hardening layer is 10 micrometers or less, It is more preferable that it is 5 micrometers or less, It is further more preferable that it is 2 micrometers 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 an adhesive bond hardening layer is more than a lower limit, rigidity becomes high and the curl suppression effect in an optical laminated body and an optical laminated body with an adhesion layer can be improved. On the other hand, by making the thickness of an adhesive bond hardening layer within an upper limit, coating defects, such as a bubble interlocking, can be prevented.

(Adhesive layer with peeling layer)

The 1st adhesion layer with a peeling layer and the 2nd adhesion layer with a peeling layer (Hereinafter, these may be collectively called "the peeling layer with a peeling layer.") Apply | coated the adhesive composition on the release process surface of a peeling layer, for example. By drying, etc., it can form and obtain an adhesion layer. The adhesion layer with a peeling layer may have another peeling layer for covering and protecting the surface on the opposite side to the peeling layer side of an adhesion layer as needed. The release layer and the other release layer can be peeled off at an appropriate timing.

(Peel layer)

The 1st peeling layer and the 2nd peeling layer (henceforth, these may be collectively called a "peel layer") can peel with respect to an adhesion layer, support the adhesion layer formed on a peeling layer, and an adhesion layer Has the function of protecting it. Although a well-known peeling film or a peeling paper can be used for a peeling layer, what performed the mold release process, such as a silicone coating, to the film formed from the resin material illustrated as a base material layer mentioned later, for example. The same material as the release layer can also be used for the other release layers.

A peeling layer can peel with respect to an adhesion layer, and the magnitude | size of the peeling force between a peeling layer and an adhesion layer needs to be determined in consideration of the procedure which peels a peeling layer. The said peeling force prepares the measurement test piece (200 mm in length, the size of width 25mm) which has an adhesion layer on a peeling layer, bonds to glass of a suitable size, and Shimadzu Seisakusho Autograph (AGS-50) NX) was used to chuck the peeling layer and glass partially peeled to form a peeling starting point, respectively, and the peel strength measured when the peeling layer was peeled in the direction of 180 ° at a speed of 300 mm / min was used as the peel force. can do. It is preferable that the peeling force between a peeling layer and an adhesion layer is 0.01-0.20 N / 25 mm, It is more preferable that it is 0.02-0.10 N / 25 mm, It is still more preferable that it is 0.02-0.06 N / 25 mm. If it is less than 0.01 N / 25 mm, there exists a possibility that a float may arise between a peeling layer and an adhesion layer during conveyance. Moreover, when it exceeds 0.20 N / 25mm, since the adhesiveness of a peeling layer and an adhesion layer is high, and a peeling layer becomes difficult to peel from an adhesion layer, when peeling a peeling layer, an adhesion layer will break and an adhesion layer will be peeled off. It may be in a state where a part of is attached, or undesired peeling (for example, peeling between the adhesive layer and the bonding layer opposite to the peeling layer of the adhesive layer) may occur.

(Liquid crystal layer)

The first liquid crystal layer and the second liquid crystal layer (hereinafter, both may be referred to as "liquid crystal layers") may be cured layers formed by polymerizing a polymerizable liquid crystal compound, and may be a retardation layer. The optical characteristic of a liquid crystal layer can be adjusted with the orientation state of a polymeric liquid crystal compound.

In this specification, the horizontal orientation which the optical axis of a polymeric liquid crystal compound oriented horizontally with respect to a base material layer plane, and the vertical orientation which the optical axis of the polymeric liquid crystal compound oriented perpendicularly with respect to a base material layer plane are defined. An optical axis means the refractive index ellipsoid formed by the orientation of a polymeric liquid crystal compound WHEREIN: The direction which the cross section cut out in the direction orthogonal to an optical axis becomes a circle, ie, the direction in which the refractive index of two directions becomes the same.

As a polymerizable liquid crystal compound, a rod-shaped polymerizable liquid crystal compound and a disk-shaped polymerizable liquid crystal compound are mentioned. When the rod-shaped polymerizable liquid crystal compound is horizontally or vertically aligned with respect to the substrate layer, the optical axis of the polymerizable liquid crystal compound coincides with the long axis direction of the polymerizable liquid crystal compound. In the case where the discotic polymerizable liquid crystal compound is aligned, the optical axis of the polymerizable liquid crystal compound exists in a direction orthogonal to the disc surface of the polymerizable liquid crystal compound.

What is necessary is just to orientate a polymeric liquid crystal compound in a suitable direction, in order for the liquid crystal layer formed by superposing | polymerizing a polymeric liquid crystal compound to express in-plane phase difference. In the case where the polymerizable liquid crystal compound is rod-shaped, the in-plane retardation is expressed by aligning the optical axis of the polymerizable liquid crystal compound horizontally with respect to the base material layer plane. In this case, the optical axis direction and the slow axis direction coincide. In the case where the polymerizable liquid crystal compound is discoid, the in-plane retardation is expressed by orienting the optical axis of the polymerizable liquid crystal compound horizontally with respect to the substrate layer plane, and in this case, the optical axis and the slow axis are orthogonal to each other. The orientation state of a polymeric liquid crystal compound can be adjusted with the combination of an orientation film and a polymeric liquid crystal compound.

The polymerizable liquid crystal compound is a compound having a polymerizable group and having liquid crystallinity. A polymerizable group means group which participates in a polymerization reaction, and it is preferable that it is a photopolymerizable group. Here, a photopolymerizable group means group which can participate in a polymerization reaction by active radical, acid, etc. which generate | occur | produced from the photoinitiator mentioned later. Examples of the polymerizable group include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group, oxetanyl group and the like. Especially, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group, and oxetanyl group are preferable, and acryloyloxy group is more preferable. The liquid crystal property of the polymerizable liquid crystal compound may be either a thermotropic liquid crystal or a lyotropic liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal when the thermotropic liquid crystal is classified in order.

As the rod-shaped polymerizable liquid crystal compound or the disk-shaped polymerizable liquid crystal compound, known ones can be used. For example, Japanese Patent Application Laid-Open No. 2015-163937, Japanese Patent Application Laid-Open No. 2016-42185, International Publication No. 2016/158940, Japan What is illustrated in Unexamined-Japanese-Patent No. 2016-224128 can be used.

The liquid crystal layer may have a single layer structure or a multilayer structure of two or more layers. When having a multilayer structure of two or more layers, when preparing the liquid crystal layer with a base material layer mentioned later, what is necessary is just to form the liquid crystal layer of two or more multilayer structures on a base material layer. In the case where the liquid crystal layer has a one-layer structure, the thickness of the liquid crystal layer is preferably 0.3 µm or more, preferably 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, usually 10 µm or less, and preferably 5 µm or less. It is preferable that the thickness of a liquid crystal layer is 5 micrometers or less from a viewpoint of contributing to thinning of the whole polarizing plate, and effectively suppressing a possible reverse curl. Moreover, when the thickness of a liquid crystal layer is less than 0.3 micrometer, since the degree of reverse curl tends to be slight, the necessity of using the manufacturing method of the optical laminated body of the said embodiment, and the manufacturing method of the optical laminated body with adhesion layer is small.

(Liquid Crystal Layer with Substrate Layer)

The first liquid crystal layer with a base layer and the second liquid crystal layer with a base layer (hereinafter, both may be referred to as a "base layer with liquid crystal layer") include a polymerizable liquid crystal compound on the base layer. It can obtain by apply | coating and drying the composition for liquid crystal layer formation, and forming the liquid crystal layer which is a hardened layer formed by superposing | polymerizing a polymeric liquid crystal compound. When the orientation layer mentioned later is formed on a base material layer, the composition for liquid crystal layer formation should just be apply | coated on an orientation layer, and, when a liquid crystal layer is a multilayer structure of two or more layers, it apply | coats the composition for liquid crystal layer formation one by one. What is necessary is just to form a multilayered structure.

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. For solvents, polymerization initiators, reactive additives, and polymerization inhibitors, see Japanese Patent Application Laid-Open No. 2015-163937, Japanese Patent Application Laid-Open No. 2016-42185, International Publication No. 2016/158940, and Japanese Patent Publication No. 2016-224128. What is illustrated can be used.

The composition for forming a liquid crystal layer is, for example, a known coating method such as a spin coating method, an extrusion method, a gravure coating method, a die coating method, a slit coating method, a bar coating method, an application method such as an applicator method, or a printing method such as a flexographic method. It can apply | coat by a method. After apply | coating the composition for liquid crystal layer formation, it is preferable to remove a solvent on the conditions which the polymeric liquid crystal compound contained in an application layer does not superpose | polymerize. As a drying method, a natural drying method, a ventilation drying method, heat drying, a vacuum drying method, etc. are mentioned.

Polymerization of the polymerizable liquid crystal compound performed after drying of the coating layer can be performed by a known method for polymerizing a compound having a polymerizable functional group. Examples of the polymerization method include thermal polymerization, photopolymerization, and the like, and from the viewpoint of polymerization ease, photopolymerization is preferable. In the case of polymerizing the polymerizable liquid crystal compound by photopolymerization, the liquid crystal layer forming composition is coated with a photopolymerization initiator, and the liquid crystal layer forming composition is coated and dried, and the polymerizable liquid crystal compound contained in the dry film after drying. It is preferable to align the liquid crystal and to perform photopolymerization while maintaining this liquid crystal alignment state.

Photopolymerization can be performed by irradiating an active energy ray with respect to the polymeric liquid crystal compound which carried out the liquid crystal aligning in a dry film. As an active energy ray to irradiate, it can select suitably according to the kind and quantity of the polymeric group which a polymeric liquid crystal compound has, the kind of photoinitiator, etc., For example, visible light, an ultraviolet-ray, a laser light, X-ray, (alpha) ray, (beta) ray. And at least one active energy ray selected from the group consisting of γ-rays. Among them, ultraviolet light is preferred because it is easy to control the progress of the polymerization reaction, and it can be used as a photopolymerization device in a wide range of fields, and thus the photopolymerizable liquid crystal compound and the photopolymerization initiator It is preferable to select the type. In photopolymerization, superposition | polymerization temperature can also be controlled by irradiating an active energy ray, cooling a dry film by appropriate cooling means.

(Base layer)

The 1st base material layer and the 2nd base material layer (Hereinafter, both may be called a "base material layer.") Are the 1st orientation layer and 2nd orientation layer mentioned later formed on these base material layers, and 1st It has a function as a support layer which supports a 1st liquid crystal layer and a 2nd liquid crystal layer. It is preferable that a base material layer is a film formed from the 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 resin, such as polyethylene and a polypropylene; Cyclic polyolefin resins such as norbornene polymers; Polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; (Meth) acrylic acid-based resins such as (meth) acrylic acid and poly (meth) acrylate; Cellulose ester-based resins such as triacetyl cellulose, diacetyl cellulose and cellulose acetate propionate; Vinyl alcohol-based resins such as polyvinyl alcohol and polyvinyl acetate; Polycarbonate resins; Polystyrene resin; Polyarylate resins; Polysulfone resins; Polyether sulfone resin; Polyamide-based resins; Polyimide resin; Polyether ketone resins; Polyphenylene sulfide resin; Polyphenylene oxide resins, mixtures thereof, copolymers and the like. Among these resins, it is preferable to use any one or a mixture of cyclic polyolefin resin, polyester resin, cellulose ester resin, and (meth) acrylic acid resin.

The base material layer may be a single layer which mixed one type or two or more types of resins, and may have a multilayer structure of two or more layers. In the case of having a multilayer structure, the resins constituting the layers may be the same or different from each other, or may be a coated or hardened layer such as a hard coat layer.

Arbitrary additives may be added to the resin material which comprises the film formed from the resin material. As an additive, a ultraviolet absorber, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example.

Although the thickness of a 1st base material layer and a 2nd base material layer is not specifically limited, Generally, it is preferable that it is 1-300 micrometers from the point of workability, such as strength and handleability, It is more preferable that it is 10-200 micrometers, 30 It is more preferable that it is -120 micrometers.

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

The base material layer can be peeled with respect to a liquid crystal layer or the orientation layer (1st alignment layer or 2nd alignment layer) mentioned later, and the magnitude | size of the peeling force between a base material layer and a liquid crystal layer or an orientation layer peels a base material layer. It is necessary to consider accordingly. A peeling force is a method of measuring the peeling force between a peeling layer and an adhesion layer except using the test piece for a measurement which has a liquid crystal layer on a base material layer, or a test piece for measurement which has an orientation layer and a liquid crystal layer on a base material layer, and It can be measured in the same way. It is preferable that the peeling force between a base material layer and a liquid crystal layer or an alignment layer is 0.01-0.50 N / 25 mm, It is more preferable that it is 0.03-0.20 N / 25 mm, It is still more preferable that it is 0.05-0.18 N / 25 mm. Do. When peeling force is less than the said lower limit, there exists a possibility that a lifting may arise between a base material layer, a liquid crystal layer, or an orientation layer during conveyance. Moreover, when peeling force exceeds the said upper limit, since adhesiveness is too high, a liquid crystal layer or a liquid crystal layer and an orientation layer cannot be transferred to another liquid crystal layer, an optical film, etc., or an optical laminated body with an optical laminated body or an adhesion layer is provided. There exists a possibility that a peeling interface may change while each member is conveyed in the process of manufacturing the same.

Peeling force (hereinafter may be referred to as "first peeling force") between the first base material layer and the first liquid crystal layer or the first alignment layer to be described later, the second base material layer and the second liquid crystal layer or to be described later It is preferable that it is 0.01 N / 25 mm or more, and, as for the difference of the peeling force (henceforth "the 2nd peeling force") between 2nd orientation layers, it is more preferable that it is 0.03 N / 25 mm or more. When peeling a 1st base material layer from a liquid-crystal layer laminated body with a base material layer first, it is preferable that a 2nd peeling force is larger than a 1st peeling force, and to peel a 2nd base material layer from a liquid crystal layer laminated body with a base material layer first. In this case, the first peeling force is preferably larger than the second peeling force. In addition, when peeling a 1st base material layer from a liquid-crystal layer laminated body with a base material layer first, the peeling force <1st peeling force <2nd peeling force between a 2nd peeling layer and a 2nd adhesion layer from a long process viewpoint. It is desirable to be in the relationship of.

(Orientation layer)

The 1st liquid crystal layer with a base material layer may contain the 1st orientation layer between a 1st base material layer and a 1st liquid crystal layer. Moreover, the 2nd liquid crystal layer with a base material layer may contain the 2nd alignment layer between a 2nd base material layer and a 2nd liquid crystal layer.

The 1st alignment layer and the 2nd alignment layer have the orientation control force which liquid-crystal aligns the liquid crystal compound contained in a 1st liquid crystal layer and a 2nd liquid crystal layer formed on these alignment layers to a desired direction. Examples of the first alignment layer and the second alignment layer include an alignment polymer layer formed of an alignment polymer, a photoalignment polymer layer formed of a photoalignment polymer, and a groove alignment layer having an uneven pattern or a plurality of grooves (grooves) on the layer surface. The first alignment layer and the second alignment layer may be layers of the same kind or different kinds of layers. The thickness of a 1st orientation layer and a 2nd orientation layer is 10-4000 nm normally, and it is preferable that it is 50-3000 nm.

An orientation polymer layer can apply | coat the composition which melt | dissolved the orientation polymer in the solvent to the base material layer (1st base material layer or 2nd base material layer), remove a solvent, and can be formed by performing a rubbing process as needed. In this case, the orientation regulation force can be arbitrarily adjusted by the surface state of the orientation polymer and rubbing conditions as long as it is an orientation polymer layer formed from the orientation polymer.

A photo-alignment polymer layer can be formed by apply | coating the composition containing the polymer or monomer which has a photoreactive group, and a solvent to a base material layer (1st base material layer or 2nd base material layer), and irradiating light, such as an ultraviolet-ray. Especially in the case of expressing an orientation regulation force in a horizontal direction, it can form by irradiating polarized light. In this case, the orientation regulating force can be arbitrarily adjusted according to polarization irradiation conditions for the photoalignable polymer as long as it is a photoalignable polymer layer.

The groove alignment layer is an active energy ray curable resin, for example, in a method of forming an uneven pattern by performing exposure, development, or the like through an exposure mask having a patterned slit on the surface of the photosensitive polyimide film, and a plate-shaped disk having a groove on the surface thereof. Active energy ray-curable to a method of forming an uncured layer of the layer, transferring the layer to a substrate layer (first substrate layer or second substrate layer), and curing the substrate layer (first substrate layer or second substrate layer). Uncured layer of resin is formed, and this layer can be formed by the method of hardening by forming an unevenness | corrugation, etc. by sticking the roll-shaped disk which has unevenness | corrugation.

When the 1st liquid crystal layer with a base material layer contains a 1st orientation layer, when peeling a 1st base material layer, you may peel a 1st orientation layer with a 1st base material layer, and a 1st on a 1st liquid crystal layer The alignment layer may remain. When the 2nd liquid crystal layer with a base material layer contains a 2nd alignment layer, when peeling a 2nd base material layer, you may peel a 2nd alignment layer with a 2nd base material layer, and a 2nd on a 2nd liquid crystal layer The alignment layer may remain. In addition, whether a 1st orientation layer peels with a 1st base material layer, or remain | survives in a 1st liquid crystal layer can be set by adjusting the relationship of the adhesive force between each layer, for example, said thing performed with respect to a 1st base material layer It can adjust by surface treatment, such as a corona treatment, a plasma treatment, a flame treatment, a primer layer, the component of the composition for liquid crystal layer formation used in order to form a 1st liquid crystal layer, and the like. Similarly, by the surface treatment performed with respect to a 2nd base material layer, you may make it peel off with a 2nd base material layer, and may make it remain in a 2nd liquid crystal layer.

When a 1st orientation layer remains on a 1st liquid crystal layer, a 1st adhesive bond layer can be provided on a 1st orientation layer. In addition, when a 2nd orientation layer remains on a 2nd liquid crystal layer, a 2nd adhesion layer can be provided on a 2nd orientation layer.

(Circular polarizer)

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, the optical film 60 is made into a polarizer, a polarizing plate, or the polarizing plate with a protective film, and the 1st liquid crystal layer 12 is 1/2 The wavelength retardation layer may be used, and the second liquid crystal layer 22 may be a quarter wavelength retardation layer. Or similarly to the above, after making the optical film 60 into a polarizer, a polarizing plate, or a polarizing plate with a protective film, the 1st liquid crystal layer 12 is made into the 1/4 wavelength retardation layer of reverse wavelength dispersion, and a 2nd liquid crystal layer A circular polarizing plate can also be obtained by setting (22) as a positive C plate.

EXAMPLE

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. "%" And "part" in an Example and a comparative example are mass% and a mass part, unless there is particular notice.

[Measurement of curl (1)]

From the optical laminated body with the adhesion layer obtained by each Example and each comparative example, the cutting piece which cut out so that one side may become a rhomboid shape of 100 mm in length and the diagonal line may become parallel to each of MD direction and TD direction is temperature 23 degreeC. After leaving for 24 hours in an environment of 55% relative humidity, the first separator was peeled off to obtain a test piece. After sufficiently eliminating this test piece, the concave surface of the test piece was placed on the reference plane (horizontal band), and the height from the reference plane was measured for each of the four corners of the test piece. When the test piece was put on the reference plane so that the protective film side might become the upper side, when the corner of the test piece floated, the measured value showed the height of the corner from the reference plane as a positive value by making this curl the normal. On the other hand, when the test piece was placed on the reference plane so that the protective film side became the lower side, when the corner of the test piece floated, this curl was reversed, and the height of the corner from the reference plane was represented by a negative value.

About the measured value obtained about the test piece from the optical laminated body with an adhesion layer, the value which averaged the measured value of the height from the reference surface of the two corners on the diagonal parallel to MD direction was measured MD curl value parallel to the TD direction. The value which averaged the measured value of the height from the reference surface of the two corners on a diagonal was computed as a measured 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 the four corners of the test piece cut out in the same procedure as above, and the measured value is averaged in the above-mentioned procedure, and the protection Regarding the polarizing plate with a film, actual MD curl and actual TD curl were calculated.

The value which subtracted the actual measurement MD cultivation of the adhesion laminated optical laminated body from the actual measurement MD cultivation of the obtained protective film polarizing plate was set as MD culturing of the optical laminated body with adhesion layer in the case of a protective film. In the same manner, the value obtained by subtracting the actual measurement TD cult value of the pressure-sensitive adhesive layer with an adhesive layer from the actual measured TD cult value of the obtained protective film-based polarizing plate was set as the TD cult value of the pressure-sensitive adhesive layer with an adhesive layer when there was a protective film.

[Measurement (2) of curl]

A protective film in the same procedure as the measurement (1) of the said curl, except having made into a test piece the peeling of the protective film with the 1st separator from the cut piece cut out from the optical laminated body with adhesion layer obtained by each Example and each comparative example. The measured MD cult and the measured TD cult of the optical laminated body which peeled were computed. In addition, the measured value showed the height of the corner from a reference surface as a positive value, making this curl the normal when the test piece was raised to the reference surface so that the polarizing plate side might be an upper side. On the other hand, when the corner of the test piece emerges when the test piece is placed on the reference plane so that the polarizing plate side becomes the lower side, the height of the corner from the reference plane is represented by a negative value, with this curl being the reverse curl.

Moreover, also about the polarizing plate which peeled the protective film from the cut piece cut out from 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 the four corners of the test piece cut out in the same procedure as the above. The measured values were averaged in the same procedure as described above, and the measured MD cults and the measured TD curls of the polarizing plate on which the protective film was peeled off were calculated.

The value which subtracted the actual measurement MD cult of the optical laminated body which peeled the protective film from the actual measurement MD cult of the polarizing plate which peeled the protective film was made into MD culturing of the optical laminated body with an adhesion layer in the absence of a protective film. In the same manner, the value obtained by subtracting the actual TD cult value of the optical laminate from which the protective film was peeled from the actual TD cult of the polarizing plate where the protective film was peeled off was set as the TD culch of the optical laminate with an adhesive layer in the absence of the protective film.

MD curl value and TD curl value obtained by the measurement (1) and the measurement (2) of the said curl show that reverse curl is suppressed when the value is positive or zero, and when the value is negative, the reverse curl becomes larger as the absolute value is negative. Indicates that it is going on.

[Preparation of Adhesion Layer with Double-Sided Separator]

The adhesive was manufactured by the following method. In a reaction vessel equipped with a stirrer, a thermometer, a reflux condenser, a dropping device and a nitrogen inlet 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 2,2'-azo 0.08 parts of bisisobutyronitrile was added and air in the reaction vessel was replaced with nitrogen gas. The reaction solution was heated to 60 ° C. under stirring in a nitrogen atmosphere, and 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 confirmed that 1.8 million (meth) acrylic acid ester polymers were obtained.

0.30 parts of trimethylolpropane-modified tolylene diisocyanate (manufactured by Tosoh Corp., trade name "Coronate L") as 100 parts (method of acrylic content; the same as below) obtained above and the isocyanate-based crosslinking agent And 0.30 part of 3-glycidoxy propyl trimethoxysilane (Shin-Etsu Chemical Co., Ltd. make, brand name "KBM403") as a silane coupling agent, and it fully stirs and dilutes with ethyl acetate and coats an adhesive composition. A solution was obtained.

Coating the coating solution of the said adhesive composition so that the thickness after drying may be set to 25 micrometers by an applicator on the release process surface (peel-off surface) of the 1st separator (Rintech Co., Ltd. make: SP-PLR382190) which forms a peeling layer. Then, it dried at 100 degreeC for 1 minute, and formed an adhesion layer, the other 2nd separator (Lintech company SP-PLR381031) was bonded to the surface opposite to the surface to which the separator of the adhesion layer was bonded, And the adhesion layer with a double-sided separator were obtained.

[Preparation of Adhesive Composition]

After mixing the cationically curable components a1 to a3 and the cation polymerization initiator shown below, the cation polymerization initiator and the sensitizer shown below were further mixed, and then defoamed to prepare a photocurable adhesive composition. Here, the following compounding amount is based on solid amount.

Cationic curable component a1 (70 parts):

3 ', 4'-epoxycyclohexylmethyl 3', 4'-epoxycyclohexanecarboxylate (brand name: CEL2021P, manufactured by Daicel Corporation)

Cationic curable component a2 (20 parts):

Neopentylglycol diglycidyl ether (trade name: EX-211, manufactured by Nagase Chemtex Co., Ltd.)

Cationic curable component a3 (10 parts):

2-ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase Chemtex Co., Ltd.)

Cationic polymerization initiator (2.25 parts (solid content)):

Product name: 50% propylene carbonate solution of CPI-100 (manufactured by San Afro Co., Ltd.)

Sensitizer (part 2):

1,4-diethoxynaphthalene

[Preparation of the protective film polarizing plate 1]

The polyvinyl alcohol film (average degree of polymerization of about 2,400, saponification degree of 99.9 mol% or more) was uniaxially stretched by about 5 times by dry stretching, and immersed in pure water at 60 ° C. for 1 minute while maintaining a tension state. Subsequently, it was immersed at 28 degreeC for 60 second in the aqueous solution whose mass ratio of iodine / potassium iodide / water is 0.05 / 5/100. Then, it was immersed at 72 degreeC for 300 second in the aqueous solution whose mass ratio of potassium iodide / boric acid / water is 8.5 / 8.5 / 100. Subsequently, the resultant was washed with pure water at 26 ° C. for 20 seconds, and then dried at 65 ° C. to obtain a polarizer having a thickness of 7 μm in which iodine was adsorbed and oriented on the polyvinyl alcohol film.

Next, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name "KL-318" obtained from Kuraray) was melt | dissolved with respect to 100 parts of water on one side of this polarizer, and the poly which is a water-soluble epoxy resin in the aqueous solution. Epoxy adhesive with 1.5 parts of amide epoxy additives (trade name "Sumirez resin 650 (30)" obtained from Taokakagaku Kogyo Co., Ltd., solid content concentration 30%) added is coated, and the thickness is 13 as a protective layer. A µm transparent norbornene-based resin film was bonded. Thus, the polarizing plate in which the protective layer was laminated | stacked on one side of the polarizer was obtained. Furthermore, a protective film having a 15 μm acrylic adhesive layer formed on a 38 μm thick polyethylene terephthalate (PET) film was bonded to a surface opposite to the polarizer of the norbornene-based resin film, and a polarizing plate with a protect film having a thickness of 73 μm ( 1) was obtained. The measured MD cultivation value of this protective film polarizing plate was -20 mm, and the measured TD cult value was 1 mm. In addition, the measured MD curl value of the polarizing plate which peeled the protective film was 4 mm, and the measured TD curl value was -1 mm.

[Preparation of the 1st liquid crystal layer with a base material layer, and the 2nd liquid crystal layer with a base material layer]

(Preparation of the composition (1) for photo-alignment layer formation)

The following components were mixed, and the obtained mixture was stirred at the temperature of 80 degreeC for 1 hour, and the composition for photo-alignment layer formation was obtained.

Photo-orientation material (5 parts):

Solvent (95 parts): cyclopentanone

(Preparation of the composition (2) for orientation layer formation)

2-butoxyethanol was added to the San EVA SE-610 (made by Nissan Kagaku Kogyo Co., Ltd.) which is a commercially available orientation polymer, and the composition (2) for orientation layer formation was obtained. The content rate of solid content with respect to the composition whole quantity was 1%, and the content rate of the solvent with respect to this composition whole quantity was 99% in the obtained composition (2) for orientation layer formation. Solid content of the San Eva SE-610 was converted from the concentration described in the specification.

(Preparation of composition (A-1) for liquid crystal layer formation)

The following components were mixed, and the obtained mixture was stirred at 80 degreeC for 1 hour, and the composition for liquid crystal layer formation (A-1) was obtained. The polymeric liquid crystal compound A1 and the polymeric liquid crystal compound A2 were synthesize | combined by the method of Unexamined-Japanese-Patent No. 2010-31223.

Polymerizable Liquid Crystal Compound A1 (80 parts):

Polymeric Liquid Crystal Compound A2 (20 parts):

Polymerization initiator (6 parts):

2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one (irgacure 369; manufactured by Chivas Specialty Chemicals)

Solvent (400 parts): cyclopentanone

(Preparation of composition (B-1) for liquid crystal layer formation)

The following components were mixed, the obtained mixture was stirred at 80 ° C for 1 hour, and then cooled to room temperature to obtain a composition for forming a liquid crystal layer (B-1).

Polymeric liquid crystal compound LC242 (manufactured by BASF Corporation) (19.2%):

Polymerization initiator (0.5%):

Irgacure (registered trademark) 907 (manufactured by 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

(Manufacture of 1st liquid crystal layer with base material layer)

A polyethylene terephthalate (PET) film having a thickness of 100 µm was treated once under conditions of an output of 0.3 kW and a processing speed of 3 m / min using a corona treatment device (AGF-B10, manufactured by Kasuga Denki Co., Ltd.). . On the surface subjected to corona treatment, the composition (1) for forming a photo-alignment layer was coated with a bar coater, dried at 80 ° C. for 1 minute, and a polarizing UV irradiation device (SPOT CURE SP-7; manufactured by Ushio Denki Co., Ltd.) was used. Using this, polarized light UV exposure was performed by the integrated light quantity of 100 mJ / cm <2>, and the photo-alignment layer was obtained. It was 100 nm when the thickness of the obtained photo-alignment layer was measured by the laser microscope (LEXT, Olympus Co., Ltd. make). The thickness of the first liquid crystal layer was 2 μm.

Subsequently, the composition (A-1) for forming a liquid crystal layer was applied onto a photoalignment layer using a bar coater, and dried at 120 ° C. for 1 minute, followed by a high pressure mercury lamp (Unicure VB-15201BY-A, Ushio Denki Kabu). The first liquid crystal layer serving as the retardation layer was formed by irradiating ultraviolet light (in a nitrogen atmosphere, accumulated light quantity at a wavelength of 365 nm and a wavelength of 365 nm: 1000 mJ / cm 2) using Shikikawa Co., Ltd. to provide a base layer. The first liquid crystal layer was obtained.

(Manufacture of 2nd liquid crystal layer with base material layer)

A 38-micrometer-thick polyethylene terephthalate (PET) film 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 processing speed of 3 m / min. . The composition (2) for orientation layer formation was apply | coated to the surface which corona-treated, and it dried at 90 degreeC for 1 minute, and obtained the orientation layer. It was 34 nm when the thickness of the obtained orientation layer was measured by the laser microscope (LEXT, Olympus Corporation).

Subsequently, the composition (B-1) for forming a liquid crystal layer was applied onto the alignment layer using a bar coater, and dried at 90 ° C. for 1 minute, followed by high pressure mercury lamp (Unicure VB-15201BY-A, Ushio Denki Co., Ltd.). Ga. Co., Ltd.), a second liquid crystal layer serving as a retardation layer is formed by irradiating ultraviolet light (in a nitrogen atmosphere, wavelength: 365 nm, accumulated light amount at a wavelength of 365 nm: 1000 mJ / cm 2) to form a base layer-containing agent. 2 liquid crystal layers were obtained. The thickness of the 2nd liquid crystal layer was 1 micrometer.

EXAMPLE 1

The optical laminated body with an adhesion layer was obtained at the process shown to FIGS. 1-4 and 6 using the 1st liquid crystal layer with a base material layer prepared above, the 2nd liquid crystal layer with a base material layer, and the adhesion layer with a double-sided separator. Specifically, it was performed as follows.

Corona treatment (800 W, 10 m / min, bar width) on the surface on the opposite side (polarizer side) from the protective film side of the protective film polarizing plate 1 (MD direction length 300mm X TD direction length 200mm) prepared above 700 mm, 1 Pass). The adhesive composition prepared above is coated using a coating machine (bar coater manufactured by Daiichi Rika Co., Ltd.) so that the thickness of the adhesive cured layer is 1 μm, an adhesive composition layer is formed, and a polarizing plate with a composition layer is prepared. Obtained (see Fig. 1 (c)).

After bonding the adhesive composition layer of the obtained composition layer polarizing plate and the 1st liquid crystal layer of the 1st liquid crystal layer with a base material layer prepared above using the bonding apparatus ("LPA3301" by Fuji Plastics Co., Ltd.) (FIG. 1) (d)), From the protective film side of the polarizing plate with a composition layer, irradiation intensity is 390 mW / in UVA area | region by the ultraviolet ray irradiation apparatus with a belt conveyor (the lamp uses "H bulb" by Fusion UV Systems). The adhesive composition was cured by irradiating ultraviolet rays such that 400 mW / cm 2 and accumulated light amount was 400 mJ / cm 2 in the UVB region so that the amount of accumulated light was 420 mJ / cm 2, thereby obtaining a first liquid crystal layer laminate having a base layer. (See FIG. 2 (a)). Moreover, it was about 3000 Mpa when the storage elastic modulus at the room temperature of the adhesive bond hardening layer which the said adhesive composition layer hardened was calculated by said calculation method.

Subsequently, the PET film (thickness 100 micrometers) of the 1st liquid crystal layer with a base material layer was peeled from the 1st liquid crystal layer laminated body with base material layer, and the 1st liquid crystal layer laminated body was obtained (refer FIG. 2 (b)). Moreover, the 2nd separator was peeled from the adhesion layer (300 mm x 200 mm) with a double-sided separator prepared above. Using the automatic bonding machine HALTEC, the PET film (100 μm in thickness) was peeled off, and the second separator was peeled off from the exposed surface of the first liquid crystal layer stack (surface on the first liquid crystal layer side) and the adhesive layer with double-sided separator. After the sheet | leaf bonding of the exposed adhesion layer was performed, the 1st separator was peeled off and the 1st liquid crystal layer laminated body with an adhesion layer was obtained (refer FIG. 3 (b)).

The adhesion layer of the 1st liquid crystal layer laminated body with an adhesion layer which peeled and exposed the 1st separator, and the 2nd liquid crystal layer of the 2nd liquid crystal layer with a base material layer prepared above were sheet-bonded using the automatic bonding machine HALTEC, 2 liquid crystal layer laminates were obtained (see FIG. 4 (b)). From the obtained 2nd liquid crystal layer laminated body, the PET film (38 micrometers in thickness) of the 2nd liquid crystal layer with a base material layer was peeled and exposed, and the adhesive layer 300 with the double-sided separator prepared above was exposed. The adhesive layer exposed by peeling a 2nd separator from mm * 200 mm) was single-layered bonding using the automatic bonding machine HALTEC, and the optical laminated body 1 with an adhesion layer was obtained (refer FIG. 6 (b)). Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 1 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 1 with adhesion layer were computed. The results are shown in Table 1.

EXAMPLE 2

The first liquid crystal layer laminate was obtained in the same procedure as in Example 1 (see FIG. 2 (b)), and the surface of the first liquid crystal layer laminate exposed by peeling off the PET film (thickness 100 μm) (first liquid crystal layer). Corona treatment (800 W, 10 m / min, bar width 700 mm, 1 Pass) was given to the side surface. The adhesive composition prepared above was coated on this corona treated surface using the coating machine (bar coater by Daiichi Rika Co., Ltd.) so that the thickness of an adhesive bond hardening layer might be set to 1 micrometer, and the adhesive composition layer was formed. . Bonding apparatus ("LPA3301" of Fuji Plastics Co., Ltd.) to the adhesive composition layer formed on the 1st liquid crystal layer of a 1st liquid crystal layer laminated body, and the 2nd liquid crystal layer of the 2nd liquid crystal layer with a base material layer prepared above. After bonding using, the irradiation intensity is 390 mW in the UVA region by a belt conveyor ultraviolet irradiation device (the lamp uses "H bulb" manufactured by Fusion UV Systems Co., Ltd.) from the second liquid crystal layer side with the base material layer. UV light was irradiated so that 400 mW / cm <2> and cumulative light amount might be 400 mJ / cm <2> in the UVB area | region so that it might become 420 mJ / cm <2> / cm <2>, and an adhesive composition was hardened and the 2nd liquid crystal layer laminated body was obtained (FIG. 5 (c)).

From the obtained 2nd liquid crystal layer laminated body, the PET film (38 micrometers in thickness) of the 2nd liquid crystal layer with a base material layer peeled and exposed, and the adhesive layer 300 with a double-sided separator prepared above. The adhesive layer exposed by peeling a 2nd separator off from a 200 x 200 mm) was bonded each other using the automatic bonding machine HALTEC, and the optical laminated body 2 with an adhesion layer was obtained (refer FIG. 6 (b)). Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 1 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 1 with adhesion layer were computed. The results are shown in Table 1.

[Comparative Example 1]

The optical laminated body with an adhesion layer was obtained at the process shown in FIGS. 7-8 using the 1st liquid crystal layer with a base material layer prepared above, the 2nd liquid crystal layer with a base material layer, and the adhesion layer with a double-sided separator. Specifically, it was performed as follows.

Corona treatment (800 W, 10 m / min, bar width) on the surface on the opposite side (polarizer side) from the protective film side of the protective film polarizing plate 1 (MD direction length 300mm X TD direction length 200mm) prepared above 700 mm, 1 Pass). Moreover, the 2nd separator was peeled from the adhesion layer (300 mm x 200 mm) with a double-sided separator prepared above. Using the automatic bonding machine HALTEC, the 2nd separator was peeled off from the corona treatment surface of the protective film polarizing plate 1 and the adhesion layer with a double-sided separator, and the single-layer bonding of the exposed adhesive layer was performed, and the polarizing plate with an adhesion layer was obtained (FIG. 7 ( a).

A self-adhesive bonding machine is a self-adhesive layer of a pressure-sensitive adhesive layer exposed by peeling a first separator from the polarizing plate with a pressure-sensitive adhesive layer, and a first liquid crystal layer of the first liquid crystal layer (300 mm in length in MD direction × 200 mm in length in the TD direction) prepared above. Single leaf conjugation was carried out using HALTEC (see FIG. 7 (c)).

Subsequently, the PET film (100 micrometers in thickness) of the 1st liquid crystal layer with the base material layer bonded with the protective film polarizing plate 2 peeled and exposed, and the double-sided separator prepared above After peeling the 2nd separator from the adhesion layer (300 mm x 200 mm) and exposing the exposed adhesion layer using the automatic bonding machine HALTEC, the 1st separator was also peeled (refer FIG. 8 (a)). The sheet | seat bonding of the adhesion layer exposed by peeling a 1st separator, and the 2nd liquid crystal layer of the 2nd liquid crystal layer (300 mm in length of MD direction x 200 mm in length of TD direction) with the base material layer prepared above were carried out using automatic bonding machine HALTEC. The optical laminated body with a base material layer was obtained (FIG. 8 (c)).

The surface (surface on the side of the 2nd liquid crystal layer) which peeled and exposed the PET film (38 micrometers in thickness) of the 2nd liquid crystal layer with a base material layer from the obtained base material layered optical laminated body, and the adhesion layer with double-sided separator prepared above The adhesive layer which peeled and exposed the 2nd separator from mm * 200 mm) was single-layered bonding using the automatic bonding machine HALTEC, and the optical laminated body 3 with an adhesion layer was obtained. Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 3 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 3 with adhesion layer were computed. The results are shown in Table 1.

As shown in Table 1, in the optical laminated body with the adhesion layers obtained in Examples 1 and 2, reverse curl is suppressed compared with the optical laminated body with the adhesion layer obtained by the comparative example 1, and with adhesion layer demonstrated in the said embodiment According to the manufacturing method of an optical laminated body, it turns out that reverse curl can be suppressed.

10, 10p: 1st liquid crystal layer with base material layer, 11, 11p: 1st base material layer, 12, 12p: 1st liquid crystal layer, 20, 20p: 2nd liquid crystal layer with base material layer, 21, 21p: 2nd base material layer , 22, 22p: second liquid crystal layer, 31: first adhesive cured layer, 31a: first adhesive composition layer, 31p: first 'adhesion layer, 32a: second adhesive composition layer, 32x: first adhesive layer, 32y : 2nd adhesive bond layer, 32p: 2nd adhesion layer, 33: 2nd adhesion layer, 33p: 3rd adhesion layer, 52: 1st peeling layer, 52p: 2nd 'peeling layer, 53: 2nd peeling Layer, 53p: 3 'peeling layer, 57: 1st adhesion layer with a peeling layer, 58: 2nd adhesion layer with a peeling layer, 60, 60p: optical film, 61: optical film with a composition layer, 65: base material layer 1st liquid crystal layer laminated body, 66: 1st liquid crystal layer laminated body, 67: 1st liquid crystal layer laminated body with an adhesion layer, 70, 70x, 70y, 70p: optical laminated body, 71, 71x, 71y, 71p: base material layer Equipped optical laminated body (optical laminated body), 80, 81: Optical laminated body with adhesion layer.

Claims (12)

As a manufacturing method of the optical laminated body in which an optical film, a 1st adhesive hardened layer, a 1st liquid crystal layer, an adhesive layer, and a 2nd liquid crystal layer were laminated | stacked 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 layer having a first base layer and the first liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the first base layer;
Preparing a second liquid crystal layer with a base layer having a second base layer and the second liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound on the second base layer;
Laminating the optical film on the first liquid crystal layer side of the first liquid crystal layer with base material layer through the first adhesive cured layer to obtain a first liquid crystal layer laminate with base material layer;
Peeling the first base material layer from the first liquid crystal layer laminate with base material layer to obtain a first liquid crystal layer laminate,
The second liquid crystal layer laminate and the second base layer provided with the first liquid crystal layer laminate and the base layer so that the first exposed surface side of the first liquid crystal layer laminate exposed by peeling the first base layer and the second liquid crystal layer face each other through the adhesive layer. The manufacturing method of an optical laminated body containing the process of laminating | stacking a liquid crystal layer and obtaining a 2nd liquid crystal layer laminated body. The process of Claim 1 which obtains the said 1st liquid crystal layer laminated body with a base material layer,
A step of forming a first adhesive composition layer containing a first adhesive composition for forming the first adhesive cured layer on at least one side of the first liquid crystal layer side of the first liquid crystal layer with the optical film and the base layer. and,
After laminating the optical film on the side of the first liquid crystal layer of the first liquid crystal layer with a base material layer through the first adhesive composition layer, the first adhesive composition layer is cured to form the first adhesive cured layer The manufacturing method of an optical laminated body containing the process. The method according to claim 1 or 2, wherein the adhesive layer is the first adhesive layer,
The process of obtaining a said 2nd liquid crystal layer laminated body is
Forming a first adhesive layer on the first exposed surface of the first liquid crystal layer laminate to obtain a first liquid crystal layer laminate having an adhesive layer;
The manufacturing method of the optical laminated body including the process of bonding the said 1st adhesion layer of the said 1st liquid crystal layer laminated body with an adhesion layer and the said 2nd liquid crystal layer of the 2nd liquid crystal layer with a base material layer. The process of Claim 3 which obtains the said 1st liquid crystal layer laminated body with an adhesion layer,
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 said 1st adhesion layer of the said 1st adhesion layer with a peeling layer and the said 1st exposure surface of the said 1st liquid crystal layer laminated body, the process of peeling the said 1st peeling layer of the optical laminated body of the Manufacturing method. The method according to claim 1 or 2, wherein the adhesive layer is the first adhesive layer,
The process of obtaining a said 2nd liquid crystal layer laminated body is
Forming a first adhesive layer on the second liquid crystal layer of the second liquid crystal layer with base material layer to obtain a second liquid crystal layer with adhesive layer;
The manufacturing method of the optical laminated body containing the process of bonding the said 1st adhesion layer of the said 2nd liquid crystal layer with an adhesion layer, and the said 1st exposure surface of the said 1st liquid crystal layer laminated body. The process of Claim 5 which obtains the said 2nd liquid crystal layer with an adhesion layer,
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 said 1st adhesion layer of the said 1st adhesion layer with a peeling layer and the said 2nd liquid crystal layer of the 2nd liquid crystal layer with a base material layer, the optical laminated body including the process of peeling the said 1st peeling layer. Method of preparation. The method according to claim 1 or 2, wherein the adhesive layer is the second adhesive cured layer,
The process of obtaining a said 2nd liquid crystal layer laminated body is
A second adhesive composition for forming the second adhesive cured layer 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 base material layer. Forming a second adhesive composition layer comprising;
After laminating the first liquid crystal layer stack and the second liquid crystal layer with the base layer so that the first exposed surface and the second liquid crystal layer face each other through the second adhesive composition layer, the second adhesive composition layer is formed. The manufacturing method of the optical laminated body containing the process of hardening | curing and forming the said 2nd adhesive bond layer. The manufacturing method of the optical laminated body of any one of Claims 1-7 in which the said optical film contains a polarizing plate. The manufacturing method of the optical laminated body of any one of Claims 1-8 in which the said optical film contains the polarizing plate with a protective film in which the protective film was laminated | stacked on at least one surface of the polarizing plate. The manufacturing method of the optical laminated body of any one of Claims 1-9 which further includes the process of peeling the said 2nd base material layer from the said 2nd liquid crystal layer laminated body. As a manufacturing method of the optical laminated body with an adhesion layer which the optical film, the 1st adhesive hardened layer, the 1st liquid crystal layer, the contact bonding layer, the 2nd liquid crystal layer, and the 2nd adhesion layer were laminated | stacked in this order,
A process of preparing the optical laminated body manufactured by the manufacturing method of the optical laminated body of Claim 10,
The manufacturing method of the optical laminated body with an adhesion layer containing the process of laminating | stacking the said 2nd adhesion layer on the 2nd exposure surface side of the said optical laminated body exposed by peeling the said 2nd base material layer. The process of claim 11, wherein the laminating of the second adhesive layer is performed.
Preparing a second adhesive layer with a release layer in which the second adhesive layer and the second release layer are laminated;
The manufacturing method of the optical laminated body with an adhesion layer containing the process of bonding the said 2nd adhesion layer of the said 2nd adhesion layer with a peeling layer, and the said 2nd exposed surface of the said optical laminated body.

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