KR20190109269A - Method for manufacturing optical laminate and method for 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 layer, a first liquid crystal layer, an adhesive cured layer, and a second liquid crystal layer are laminated in order. The manufacturing method comprises the steps of: laminating the first liquid crystal layer with a base layer and the second liquid crystal layer with the base layer so that the first liquid crystal layer and the second liquid crystal layer face each other through an adhesive cured layer to obtain a liquid crystal layer laminate with the base layer; peeling at least a first base layer from the liquid crystal layer laminate with base layer to obtain the liquid crystal layer laminate; and laminating the optical film through the first adhesive layer on a first exposure surface side of the liquid crystal layer laminate exposed by peeling the first base layer.

Description

The manufacturing method of an optical laminated body, and the manufacturing method of an optical laminated body with an adhesion layer {METHOD FOR MANUFACTURING OPTICAL LAMINATE AND METHOD FOR 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. In addition, in the organic EL display device, since it is thin and can be displayed without using a backlight, an apparatus shape in which it is bent or wound is also 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 disclose 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 using a liquid crystal material. 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-described optical film is required to have a thinner and bendable property 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 a so-called reverse curl which curls so that the side joined to an optical display element becomes concave can generate | occur | produce, an air bubble will mix in 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 pressure-sensitive adhesive layer, a first liquid crystal layer, an adhesive cured layer, and a second liquid crystal layer, as a method for producing an optical laminated body laminated in this order,

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;

Obtaining a base material layer liquid crystal layer laminated body by laminating | stacking the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer with a base material layer so that a said 1st liquid crystal layer and a said 2nd liquid crystal layer may face through the said adhesive hardened layer. and,

Peeling at least said 1st base material layer from the said liquid crystal layer laminated body with base material layers, and obtaining a liquid crystal layer laminated body,

And a step of laminating the optical film on the first exposed surface side of the liquid crystal layer laminate exposed by peeling the first base layer through the first adhesive layer.

[2] the step of laminating the optical film,

Forming a first adhesive layer on the optical film to obtain an optical film with an adhesive layer;

The manufacturing method of the optical laminated body as described in [1] including the process of joining the said 1st adhesion layer of the said optical film with an adhesion layer, and the said 1st exposure surface of the said liquid crystal layer laminated body.

[3] the step of obtaining the optical film with the 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 manufacturing method of the optical laminated body as described in [2] which includes the process of peeling the said 1st peeling layer, after bonding the said 1st adhesion layer of the 1st adhesion layer with a peeling layer and the said optical film.

[4] the step of laminating the optical film,

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

The manufacturing method of the optical laminated body as described in [1] including the process of bonding the said 1st adhesion layer and the said optical film of the said liquid-crystal layer laminated body with a 1st adhesion layer.

[5] The step of obtaining the liquid crystal layer laminate with the first adhesive layer comprises

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 exposure surface of the said liquid crystal layer laminated body is described in [4]. The manufacturing method of one optical laminated body.

[6] the step of obtaining the liquid crystal layer laminate with base material layer,

Adhesive composition layer containing adhesive composition for forming the said adhesive hardened layer in at least one of the said 1st liquid crystal layer of the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer of a 2nd liquid crystal layer with a base material layer. Forming a process,

After laminating the first liquid crystal layer with the base layer and the second liquid crystal layer with the base layer so that the first liquid crystal layer and the second liquid crystal layer face each other through the adhesive composition layer, the adhesive composition layer is cured to The manufacturing method of the optical laminated body in any one of [1]-[5] including the process of forming an adhesive bond hardening layer.

[7] The method for producing an optical laminate according to any one of [1] to [6], wherein the optical film contains a polarizing plate.

[8] The method for producing an optical laminate according to any one of [1] to [7], wherein the optical film includes a polarizing plate with a protective film having a protective film laminated on at least one side of the polarizing plate.

[9] The step of obtaining the liquid crystal layer laminate is a step of peeling the first substrate layer from the liquid crystal layer laminate with the substrate layer and not peeling the second substrate layer.

The manufacturing method of the optical laminated body in any one of [1]-[8] which includes the process of peeling the said 2nd base material layer after the process of laminating the said optical film.

[10] The process for obtaining the liquid crystal layer laminate is a process for obtaining the liquid crystal layer laminate by peeling the first substrate layer and the second substrate layer from the liquid crystal layer laminate with the base layer. The manufacturing method of the optical laminated body in any one of].

[11] A method for producing an optical laminate with a pressure-sensitive adhesive layer in which an optical film, a first pressure-sensitive adhesive layer, a first liquid crystal layer, an adhesive curing layer, a second liquid crystal layer, and a second pressure-sensitive adhesive layer are laminated in this order,

Preparing an optical laminate produced by the method for producing an optical laminate according to [9] or [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 adhesive layer as described in [11] including the process of joining 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.

[13] A method for producing an optical laminate with an adhesive layer in which an optical film, a first adhesive layer, a first liquid crystal layer, an adhesive curing layer, a second liquid crystal layer, and a second adhesive layer are laminated in this order,

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;

Obtaining a base material layer liquid crystal layer laminated body by laminating | stacking the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer with a base material layer so that a said 1st liquid crystal layer and a said 2nd liquid crystal layer may face through the said adhesive hardened layer. and,

Peeling at least said 2nd base material layer from the said liquid crystal layer laminated body with base material layers, and obtaining a liquid crystal layer laminated body,

A step of laminating the second adhesive layer on the second exposed surface side of the liquid crystal layer laminate exposed by peeling the second substrate layer to obtain a liquid crystal layer laminate having a second adhesive layer;

Peeling the first substrate layer from the liquid crystal layer laminate with the base layer or the liquid crystal layer laminate with the second adhesive layer;

The optical laminated body with an adhesion layer containing the process of laminating | stacking the said optical film through the said 1st adhesion layer on the 1st exposed surface side of the said 2nd adhesion layer liquid crystal layer laminated body exposed by peeling the said 1st base material layer. Method of preparation.

[14] The step of obtaining the liquid crystal layer laminate with the second adhesion layer,

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

[13] comprising the step of peeling the second release layer after bonding the second adhesion layer of the second adhesion layer with the release layer and the second exposed surface of the liquid crystal layer laminate. The manufacturing method of the optical laminated body with an adhesion layer described above.

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.
(A)-(c) is a schematic sectional drawing which shows typically the continuation of the manufacturing process of the optical laminated body shown in FIG.
4 (a) and 4 (b) are schematic cross-sectional views schematically showing the continuation of the manufacturing process of the optical laminate shown in FIG. 3.
5: (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.6 (a)-(d) are schematic sectional drawing which shows an example of the manufacturing process of another 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.
8A to 8D are schematic cross-sectional views schematically showing the continuation of the manufacturing process of the optical laminate shown in FIG. 7.

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 70 manufactured by the manufacturing method of the optical laminated body 70 of this embodiment is the optical film 60, the 1st adhesion layer 31, as shown in FIG.4 (b), The first liquid crystal layer 12, the adhesive cured layer 32, and the second liquid crystal layer 22 are laminated in this order.

The manufacturing method of the optical laminated body 70 is based on 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 adhesive composition layer 32a containing the adhesive composition for forming the adhesive bond hardening layer 32 on the surface of the 2nd liquid crystal layer 22 side of the 2nd liquid crystal layer with base material layer. Is done. By this process, the 2nd liquid crystal layer 25 with a composition layer can be obtained (FIG. 1 (c)). As shown in FIG.1 (c), the 2nd liquid crystal layer with a composition layer laminated | stacked the adhesive composition layer 32a, the 2nd liquid crystal layer 22, and the 2nd base material layer 21 in this order. It is. The process of forming the 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 | stacking the adhesive composition layer 32a of the obtained 2nd liquid crystal layer 25 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)), By hardening the adhesive composition layer 32a and forming the adhesive cured layer 32, the liquid-crystal layer laminated body 40 with a base material layer is obtained (FIG. 2 (a)). Although the method of hardening the adhesive composition layer 32a can be suitably selected according to the kind of adhesive composition, etc., For example, active energy ray irradiation, heat processing, addition of a hardening | curing agent, etc. are mentioned. The kind of adhesive composition and its hardening method are mentioned later. The liquid crystal layer laminated body 40 with a base material layer is the 1st base material layer 11, the 1st liquid crystal layer 12, the adhesive bond hardening layer 32, and the 2nd liquid crystal layer, as shown to FIG. 2 (a). (22) and the second base material layer 21 are laminated in this order. The liquid crystal layer laminated body 41 is obtained by peeling the 1st base material layer 11 and not peeling the 2nd base material layer 21 from this liquid crystal layer laminated body 40 with a base material layer (FIG. 2 (b)). ). As shown in FIG. 2 (b), the liquid crystal layer laminate 41 has a first liquid crystal layer 12, an adhesive cured layer 32, a second liquid crystal layer 22, and a second base layer 21. This is stacked in this order.

Next, the 1st adhesion layer 50 with a peeling layer in which the 1st adhesion layer 31 was formed on the 1st release layer 51 is prepared (FIG. 3 (a)). The process of preparing the 1st adhesion layer 50 with an adhesion layer may include the process of forming the 1st adhesion layer 31 by apply | coating, drying, etc. of an adhesive composition on the 1st peeling layer 51. FIG. good. Moreover, you may arrange | position the process of covering the surface on the opposite side to the 1st peeling layer 51 of the 2nd adhesion layer 31 with another peeling layer as needed. The 1st adhesion layer 31 and the optical film 60 of the prepared 1st adhesion layer 50 with a peeling layer were bonded together (FIG. 3 (b)), and the 1st peeling layer 51 was peeled off and an adhesion layer was provided. The optical film 61 is obtained (FIG. 3 (c)). In the optical film 61 with an adhesion layer, as shown to FIG. 3 (c), the optical film 60 and the 1st adhesion layer 31 are laminated | stacked.

Then, the 1st liquid crystal layer 12 of the liquid crystal layer laminated body 41 exposed by peeling the 1st adhesion layer 31 of the optical film 61 with an adhesion layer and the 1st base material layer 11 (made 1 exposure surface) is bonded together, and the optical laminated body 71 (optical laminated body) with a base material layer is obtained (FIG. 4 (a)). The optical laminated body 71 with a base material layer is the optical film 60, the 1st adhesion layer 31, the 1st liquid crystal layer 12, and the adhesive bond hardening layer 32, as shown to FIG. 4 (a). The second liquid crystal layer 22 and the second base layer 21 are laminated in this order. The optical laminated body 70 can be obtained by peeling the 2nd base material layer 21 from this optical laminated body 71 with a base material layer (FIG. 4 (b)).

In the manufacturing method of the said optical laminated body 70, a polymeric compound on the 1st base material layer 11 or the 2nd base material layer 21 (Hereinafter, both may be referred to as 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 a liquid crystal layer with a base layer, the composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound is usually applied onto a base layer and dried, and the polymerizable liquid crystal compound is polymerized and cured by irradiation with active energy rays such as ultraviolet rays. 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. In the state of the liquid crystal layer with a base material layer in which the liquid crystal layer exists on the base material layer, the above-described shrinkage stress is suppressed by the base material layer, but as described above, the base material layer is a step of manufacturing the optical laminate 70. 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 deformation of the bow of the optical film and the liquid crystal layer to the inside of the laminate of the optical film and the liquid crystal layer due to the shrinkage stress released by peeling the base material layer (hereinafter, May be referred to as "reverse curl."

It is thought that such curling is more likely to occur as the number of times that the base layer is peeled off to release the shrinkage stress of the liquid crystal layer after laminating the optical film 60 and the liquid crystal layer. For example, as shown in FIGS. 7 and 8, in the case of manufacturing an optical laminate by sequentially laminating a liquid crystal layer on an optical film, the number of times to release the shrinkage stress of the liquid crystal layer after laminating the optical film and the liquid crystal layer. Tends to increase. 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 optical film 61p with adhesion layer which laminated | stacked the optical film 60p and the 1st adhesion layer 31p first (FIG. 7 (a) 1st liquid crystal layer 10p (with base layer) which has the 1st liquid crystal layer 12p formed by superposing | polymerizing the polymeric liquid crystal compound on the 1st base material layer 11p to the 1 'adhesion layer 31p of ()). 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 first liquid crystal layer 12p exposed by this peeling and the second 'formed on the second' peeling layer 52p are formed. The adhesive layer 32p is bonded (FIG. 7 (e)), and the 2 '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 (22p) 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, since the shrinkage stress of the 1st liquid crystal layer 12p and the 2nd liquid crystal layer 22p is free | released, respectively, It is thought that reverse curl is easy to generate | occur | produce in the optical laminated body 70p.

On the other hand, in the manufacturing method of the optical laminated body 70 of this embodiment shown in FIGS. 1-4, the 1st liquid crystal layer 10 with a base material layer, and the 2nd liquid crystal layer with a base material layer are first It laminated | stacked through the adhesive bond hardening layer 32, and obtained the liquid-crystal layer laminated body 40 with a base material layer (FIG. 2 (a)). Then, the 1st base material layer 11 is peeled off, the liquid crystal layer laminated body 41 which released | released the shrinkage stress of the 1st liquid crystal layer 12 was obtained (FIG. 2 (b)), and this liquid crystal layer laminated body ( 41 and the optical film 60 are bonded together (FIG. 4 (a)), and the 2nd base material layer 21 is peeled off (FIG. 4 (b)). Therefore, according to the manufacturing method of the optical laminated body 70, the peeling process performed after laminating | stacking the 1st liquid crystal layer 12 and the 2nd liquid crystal layer 22 on the optical film 60 is a 2nd base material layer. Since it is only the process of peeling (21), compared with the manufacturing process shown in FIG. 7 and FIG. 8, the frequency | count which releases the shrinkage stress of a liquid crystal layer can be reduced after laminating | stacking a liquid crystal layer on an optical film. Therefore, in the manufacturing method of the optical laminated body 70 shown in FIGS. 1-4, the optical laminated body obtained by the reverse curl which arises in the optical laminated body 70 in the manufacturing process shown to FIG. 7 and FIG. It is thought that it can reduce compared with 70p).

In addition, in the optical laminated body 71 with a base material layer shown to Fig.4 (a), the 1st liquid crystal layer 12 and the 2nd liquid crystal layer 22 are laminated | stacked through the adhesive agent hardening layer 32. As shown in FIG. On the other hand, in the optical laminated body 71p with the base material layer shown to FIG. 8 (c), the 1st liquid crystal layer 12p and the 2nd liquid crystal layer 22p are laminated | stacked via the 2nd adhesion layer 32p. . The adhesive cured layer 32 has high rigidity as compared with the 2nd adhesion layer 32p, and is hard to be deformed. Therefore, even if the 2nd base material layer 21 is peeled from the optical laminated body 71 with base material layers shown to FIG. 4 (a), shrinkage of the 2nd liquid crystal layer 22 is carried out by the adhesive bond hardening layer 32. FIG. It is estimated that it is easy to maintain in the state which suppressed the stress. On the other hand, when peeling the 2nd base material layer 21p from the optical laminated body 71p with base material layer shown to FIG. 8 (c), it is influenced by the shrinkage stress of the 2nd liquid crystal layer 22, It is thought that 1 'adhesion layer 31p, 2nd adhesion layer 32p, and optical film 60p are easy to deform | transform, and reverse curl tends to arise in the optical laminated body 70. FIG. Therefore, in the manufacturing method of the optical laminated body 70 shown to FIGS. 1-4, the optical laminated body 70p obtained with the reverse curl which generate | occur | produces in the optical laminated body 70 in the manufacturing process shown to FIG. 7 and FIG. It is easy to reduce in comparison with).

As described above, when the optical curled body (described later) with the adhesive layer obtained by using the optical laminated body 70 is bonded to the optical display element by reducing the reverse curl generated in the optical laminated body 70, the adhesive layer is used. The problem that foam | bubble mixes, wrinkles, or a bonding miss arises between an equipped optical laminated body and an optical display element can be suppressed.

In addition, as shown in FIG. 7E, after laminating the optical film 60p and the first liquid crystal layer 12p, a second 'adhesion layer 32p is provided on the first liquid crystal layer 12p. There is a case. In this case, as described above, the second 'adhesive layer 32p provided on the second' peeling layer 52p is laminated on the first liquid crystal layer 12p together with the second 'peeling layer 52p. Thereafter, the second 'peeling layer 52p may be peeled off. The process of peeling the 2 ′ peeling layer 52p may also cause a reverse curl to easily occur in the optical laminate 70p.

On the other hand, in the manufacturing method of the optical laminated body 70 of this embodiment shown in FIGS. 1-4, the 1st liquid crystal layer 12 and the 2nd liquid crystal layer 22 are bonded together through the adhesive bond hardening layer 32. FIG. Thus, the liquid crystal layer laminate 41 shown in FIG. 2B is obtained. And since this liquid crystal layer laminated body 41 is laminated | stacked on the optical film 60, in the manufacturing method of the optical laminated body 70 of this embodiment, the optical laminated body 70p shown to FIG. 7 and FIG. Compared with the manufacturing process of), since there exists no process of peeling at least the 2nd peeling layer 52p, the number of layers peeling after laminating | stacking on the optical film 60 can be reduced. Therefore, in the manufacturing method of the optical laminated body 70, compared with the manufacturing process of the optical laminated body 70p, it is thought that the reverse curl which arises in the optical laminated body 70 is easy to be suppressed.

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 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 film shapes, such as the 1st adhesion layer 50 with an peeling layer, the optical film 60, and the optical film 61 with an adhesion layer, are all elongate film shapes, and perform each process, conveying these continuously. It is preferable. 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, using the composition layer equipped 2nd liquid crystal layer 25 which provided the adhesive composition layer 32a in the 2nd liquid crystal layer 22 side of the 2nd liquid crystal layer 20 with a base material layer (FIG. 1 (c)). Although the case where the 1st liquid crystal layer 12 of the 1st liquid crystal layer 10 with a base material layer was laminated on this adhesive composition layer 32a was demonstrated to the example, of the 1st liquid crystal layer with base material layer The liquid crystal layer laminated body 40 with the base material layer which laminated | stacked the 1st liquid crystal layer 12 and the 2nd liquid crystal layer 22 of the 2nd liquid crystal layer 20 with a base material layer through the adhesive bond hardening layer 32 ( If it can obtain FIG.2 (a), it is not limited to this. For example, the adhesive composition layer 32a is provided in the 1st liquid crystal layer 12 side of the 1st liquid crystal layer 10 with a base material layer, and the 2nd liquid crystal layer 20 with a base material layer is provided on this adhesive composition layer 32a. After laminating | stacking the 2nd liquid crystal layer 22 of (), you may harden | cure the adhesive composition layer 32a to form the adhesive bond hardening layer 32. FIG. The adhesive composition layer 32a is disposed on both sides of the first liquid crystal layer 12 of the first liquid crystal layer 10 having the base layer and the second liquid crystal layer 22 side of the second liquid crystal layer 20 having the base layer. It may be formed.

(Modification 2 of Embodiment 1)

In the above, the 1st adhesion layer 31 is provided in the optical film 60 using the 1st adhesion layer 50 with a peeling layer shown to Fig.3 (a), and the adhesion layer optical film 61 is provided. 3 (c), the case where the 1st adhesion layer 31 of this optical film 61 with an adhesion layer and the 1st liquid crystal layer 12 of the liquid crystal layer laminated body 41 are bonded is demonstrated as an example. However, the optical film 60 is laminated on the exposed surface (first liquid crystal layer 12) of the liquid crystal layer laminate 41 exposed by peeling the first base layer 11 through the first adhesive layer 31. If possible, it is not limited to this. For example, using the 1st adhesion layer 50 with a peeling layer shown to Fig.3 (a), the 1st adhesion layer (on the exposed surface (first liquid crystal layer 12) of the liquid crystal layer laminated body 41 ( 31 may be obtained, and the optical film 60 may be laminated on the first adhesive layer 31. In this case, the 1st adhesion layer liquid crystal layer laminated body has the 1st adhesion layer 31, the 1st liquid crystal layer 12, the adhesive bond hardening layer 32, the 2nd liquid crystal layer 22, and the 2nd base material layer ( It is good to have 21 in this order, and you may have the 1st peeling layer 51 on the surface on the opposite side to the 1st liquid crystal layer 12 of the 1st adhesion layer 31. FIG.

(Modification 3 of Embodiment 1)

In the above, it is shown in FIG.2 (b), without peeling the 1st base material layer 11 and peeling the 2nd base material layer 21 from the liquid-crystal layer laminated body 40 with base material layers shown to FIG.2 (a). After obtaining the liquid crystal layer laminated body 41 and laminating the optical film 60 and the liquid crystal layer laminated body 41 through the 1st adhesion layer 31, the case where the 2nd base material layer 21 is peeled off Although demonstrated as an example, it is not limited to this. For example, the 1st base material layer 11 and the 2nd base material layer 21 are peeled from the liquid-crystal layer laminated body 40 with base material layers shown to FIG. 2 (a), and a liquid crystal layer laminated body is obtained, and a 1st base material layer The optical film 60 may be laminated | stacked through the 1st adhesion layer 31 on the exposed surface side of the liquid crystal layer laminated body exposed by peeling (11). As for the liquid crystal layer laminated body obtained by peeling the 1st base material layer 11 and the 2nd base material layer 21 from the liquid crystal layer laminated body 40 with a base material layer, the 1st liquid crystal layer 12 and the adhesive bond hardening layer 32 And the second liquid crystal layer 22 are laminated in this order.

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

FIG.5 (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 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 adhesion layer 31, the 1st liquid crystal layer 12, the adhesive bond hardening layer 32, the 2nd liquid crystal layer 22, and the 2nd adhesion layer 33 are laminated | stacked in this order. The second peeling layer 53 may be provided on the side opposite to the second liquid crystal layer 22 of the second adhesive layer 33.

The manufacturing method of the optical laminated body 80 with an adhesion layer includes the process of preparing the optical laminated body 70 shown to FIG. 4 (b), and the 2nd peeling layer (as shown to FIG. 5 (a)). 53) and the 2nd adhesion layer 58 with the peeling layer which laminated | stacked the 2nd adhesion layer 33 are 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. 5 (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 can be bonded together, and it can be set as an image display panel. have.

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. It is thought that the so-called reverse curl which curls so that the adhesion layer 33 side may become concave can be suppressed. Thereby, when bonding the optical laminated body with an adhesion layer 80 to an optical display element, a bubble may mix between an optical laminated body and an optical display element, and the problem that a bonding miss may arise 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.

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

FIG.6 (a)-FIG.6 (d) 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. The optical laminated body 81 with an adhesive layer manufactured by the manufacturing method of the optical laminated body with adhesion layer of this embodiment is the optical laminated body 80 with adhesion layer demonstrated by previous embodiment (FIG. 5 (b)). 6D, the optical film 60, the first adhesive layer 31, the first liquid crystal layer 12, the adhesive cured layer 32, and the second liquid crystal layer 22 are the same as those shown in FIG. ) And the second adhesive layer 33 are laminated in this order. The second peeling layer 53 may be provided on the side opposite to the second liquid crystal layer 22 of the second adhesive layer 33.

In the manufacturing method of the optical laminated body 81 with an adhesion layer, the liquid crystal layer laminated body 40 with a base material layer shown to FIG. 2 (a) is obtained similarly to the manufacturing method demonstrated in previous embodiment, and FIG. The 2nd adhesion layer 58 with a peeling layer shown in () is prepared. The process of obtaining the liquid-crystal layer laminated body 40 with a base material layer is as having demonstrated based on FIG. 1 (a)-FIG. 1 (e) and FIG. 2 (a) in previous embodiment, and a release layer provision agent Since the process of preparing the 2nd adhesion layer 58 is the same as what was demonstrated based on FIG. 5 (a) in previous embodiment, the description is abbreviate | omitted.

Subsequently, the liquid crystal layer laminate 43 is removed from the liquid crystal layer laminate 40 with the base layer shown in FIG. 2A without peeling the second base layer 21 and peeling off the first base layer 11. 6 (a). As shown in FIG. 6 (a), the liquid crystal layer laminate 43 includes the first base material layer 11, the first liquid crystal layer 12, the adhesive cured layer 32, and the second liquid crystal layer 22. This is stacked in this order. 2nd adhesion layer of the 2nd liquid crystal layer 22 (2nd exposed surface) of the liquid crystal layer laminated body 43 exposed by peeling the 2nd base material layer 21, and the 2nd adhesion layer 58 with a peeling layer. (33) is bonded together and the liquid crystal layer laminated body 45 with a 2nd adhesion layer is obtained (FIG. 6 (b)). As shown in FIG.6 (b), the liquid crystal layer laminated body 45 with a 2nd adhesion layer is the 1st base material layer 11, the 1st liquid crystal layer 12, the adhesive bond hardening layer 32, and the 2nd The liquid crystal layer 22, the second adhesive layer 33, and the second peeling layer 53 are laminated in this order.

Next, the optical film 61 with an adhesion layer shown to FIG. 3 (c) is prepared. Since the process of obtaining the optical film 61 with an adhesion layer is the same as what was demonstrated based on FIG. 3 (a)-FIG. 3 (c) in previous embodiment, the description is abbreviate | omitted. Then, the 1st liquid crystal layer exposed by peeling the 1st base material layer 11 from the liquid crystal layer laminated body 45 with a 2nd adhesion layer (FIG. 6 (c)), and peeling the 1st base material layer 11 is carried out. (12) (1st exposed surface) and the 1st adhesion layer 31 of the optical film 61 with an adhesion layer are bonded together, and the optical laminated body 81 with an adhesion layer is obtained (FIG. 6 (d)).

In the manufacturing method of the optical laminated body 81 with an adhesion layer, the liquid crystal layer laminated body 43 which laminated | stacked the 1st liquid crystal layer 12 and the 2nd liquid crystal layer 22 through the adhesive bond hardening layer 32 is The liquid crystal layer laminated body 45 with the 2nd adhesion layer which laminated | stacked the 2nd adhesion layer 33 on the 2nd liquid crystal layer 22 was obtained further. And since the 1st base material layer 11 is peeled off from this 2nd adhesion layer liquid crystal layer laminated body 45, and is laminated | stacked on the optical film 61 via the 1st adhesion layer, it demonstrated in previous embodiment. It is thought that the reverse curl of the optical laminated body 81 with an adhesion layer obtained can be suppressed for the same reason. Thereby, when joining the optical laminated body 81 with an adhesion layer to an optical display element, a bubble will be mixed between an optical laminated body and an optical display element, wrinkles will enter | blend, the problem of a bonding miss, etc. will be suppressed. Can be.

In addition, in this embodiment, the 1st liquid crystal layer 10 with a base material layer, the 2nd liquid crystal layer with a base material layer, and the 1st adhesion layer with a peeling layer (used in order to manufacture an optical laminated body with an adhesion layer) are used. It is preferable that all the film-shaped objects, such as 50) and the 2nd adhesion layer 58 with an peeling layer, the optical film 60, and the optical film 61 with an adhesion layer, are all elongate film shapes, and are conveying these continuously, respectively. It is preferable to perform a process. 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 3)

In the above, the 1st adhesion layer 31 is provided in the optical film 60 using the 1st adhesion layer 50 with a peeling layer shown to Fig.3 (a), and the adhesion layer optical film 61 is provided. Although the case where the 1st adhesion layer 31 of this optical film 61 with an adhesion layer and the 1st liquid crystal layer 12 of the liquid crystal layer laminated body 41 was bonded was demonstrated as an example, the 1st base material layer ( The optical film 60 is made to pass through the 1st adhesion layer 31 on the 1st exposure surface (1st liquid crystal layer 12) of the liquid crystal layer laminated body 45 with the 2nd adhesion layer exposed by peeling 11). If it can laminate | stack, it is not limited to this. For example, the 1st exposure of the liquid crystal layer laminated body 45 with a 2nd adhesion layer which peeled the 1st base material layer 11 using the 1st adhesion layer 50 with a peeling layer shown to FIG. 3A is shown. The 1st adhesion layer 31 may be provided on the surface (1st liquid crystal layer 12), and the optical film 60 may be laminated | stacked on this 1st adhesion layer 31. FIG.

(Modification 2 of Embodiment 3)

In the above, the 2nd base material layer 21 is peeled from the liquid-crystal layer laminated body 40 with base material layers shown to Fig.2 (a), and it is shown in FIG. 6 (a), without peeling the 1st base material layer 11. After obtaining the liquid crystal layer laminated body 43, and laminating | stacking the 2nd adhesion layer 33 of the liquid crystal layer laminated body 43 and the 2nd adhesion layer 58 with a peeling layer, the 1st base material layer 11 was made into Although the case where peeling was mentioned as an example and demonstrated, it is not limited to this. For example, the 1st base material layer 11 and the 2nd base material layer 21 are peeled from the liquid-crystal layer laminated body 40 with base material layers shown to Fig.2 (a), and a liquid crystal layer laminated body is obtained, and this liquid crystal layer laminated | stacked. After laminating | stacking the 2nd liquid crystal layer side of a sieve and the 2nd adhesion layer 58 with a peeling layer, and obtaining a 2nd adhesion layer liquid crystal layer laminated body, the 1st liquid crystal layer of this liquid crystal layer laminated body with a 2nd adhesion layer ( On the 12) side, the optical film 60 may be laminated through the first adhesive layer 31. In this case, as for the liquid crystal layer laminated body, the 1st liquid crystal layer 12, the adhesive bond hardening layer 32, and the 2nd liquid crystal layer 22 were laminated | stacked in this order, and the liquid crystal layer laminated body with a 2nd adhesion layer is, The first liquid crystal layer 12, the adhesive cured layer 32, the second liquid crystal layer 22, the second adhesive layer 33, and the second peeling layer 53 are laminated in this order.

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)

An optical film is a polarizer, a polarizing plate having a protective layer formed on at least one side of the polarizer, a polarizing plate with a protective film 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, an antiglare function And a provided 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 unpolarized light is incident.

(Polarizer)

Arbitrary suitable polarizers can be employ | adopted as a polarizer. In this specification, a "polarizer" means the linear polarizer which has a property which permeate | transmits linearly polarized light which has an oscillation surface orthogonal to an absorption axis, when light with no polarization is incident. 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. The polyvinyl acetate-based resin may be a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate, in addition to 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 a polyvinyl alcohol-type resin raw film is about 10-100 micrometers, Preferably it is about 10-60 micrometers, More preferably, it is about 15-30 micrometers.

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, and then the resin layer is dyed with a dichroic dye such as iodine, and the dichroic dye is applied to the 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 to a liquid crystal layer laminated body through the 1st adhesion layer 31 or laminating to the 1st adhesion layer 50 with a peeling layer, a base film is peeled off and a polarizer You may use 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 can contain a polymerization initiator, such as a solvent and a photoinitiator, a photosensitizer, a polymerization inhibitor, etc. 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 be made into a polarizing plate by laminating | stacking a protective layer on the single side | surface or both surfaces through a well-known adhesive layer or an adhesive layer. This polarizing plate is what is called a linear polarizing plate. As a protective layer which can be laminated | stacked on the single side | surface or both surfaces of a polarizer, the film formed from the thermoplastic resin which is excellent in transparency, mechanical strength, thermal 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. Since 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 also when using the polarizing plate which laminated | stacked the protective layer only on the single side | surface of a polarizer as an optical film from a thinning viewpoint. 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 a 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 given a primer layer (it may also be called an undercoat layer). A thin 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 is more than 1500 g / m <2> * 24hr, in a high temperature, high humidity environment, the curl change with time progress of a polarizing plate may become easy to produce. 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 it is a polarizing plate in which the protective layer was laminated only on the single side | surface 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 further reduce the influence of the shrinkage stress of a 1st liquid crystal layer or a 2nd liquid crystal layer, 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 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 extended by the 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 direction at the measurement wavelength 590 nm. The phase difference value is shown. These in-plane retardation value and thickness direction retardation value say 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 (direction perpendicular to the in-plane slow axis direction), and nz for the thickness direction, nz, and the stretched thermoplastic When making thickness of resin d, it is defined by 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 in 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, Light emitted through the sieve 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 or transparent fine particles by sandblasting or embossing. By a method such as a compounding method, a fine concavo-convex structure can be provided and formed on the surface of the protective layer. 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.

The polarizing plate has the measured MD curl value and the measured TD curl value of the polarizing plate which peeled the protective film from the polarizing plate with a protective film measured by the method described in the Example mentioned later, respectively independently in the range of -40 mm or more and 40 mm or less. It is preferable to exist in the range of -30 mm or more and 35 mm or less, and it is still more preferable to exist in the range of -20 mm or more and 30 mm or less. When the measured MD curl value and the measured TD curl value are outside the above-mentioned ranges, the polarizing plate tends to be cylindrical, and the curl shape tends to be difficult to obtain. Moreover, if the measured MD curl value and the measured TD curl value of the polarizing plate with a protective film mentioned later differ from the measured MD curl value and the measured TD curl value of a polarizing plate, a float will generate | occur | produce between a protective film and a polarizing plate, Tunneling in which a gap occurs between polarizing plates occurs, which is not preferable.

(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 the single side | 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 a protective film may be 30-200 micrometers, for example, Preferably it is 40-150 micrometers, More preferably, it is 50-120 micrometers.

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, as needed, you may have the peeling layer for covering and protecting the surface on the opposite side to the resin film side for protective films of the adhesion layer for protective film. 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 protective film, it is preferable that the measured MD curl value and the measured TD curl value 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,- It is more preferable to exist in the range of 30 mm or more and 35 mm or less, and it is still more preferable to exist in the range of -20 mm or more and 30 mm or less. When the said measured MD curl value and the measured TD curl value are out of the said range, there exists a tendency for the protective film equipped polarizing plate to become cylindrical shape, and it becomes difficult to obtain curl shape. In addition, when the polarizing plate with a 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. When bonding, bubbles are mixed or wrinkles are generated. 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.). As used herein, "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 with respect to 100 mass parts of all the structural units of a (meth) acrylic acid ester polymer, More preferably, it is 0.1 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 bleed-out of additives, such as an antistatic agent mentioned 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 contained.

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, it has a structural unit (I) derived from the said (meth) acrylic acid ester as a main component, and is comparatively low molecular weight of the weight average molecular weight 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 for example, an aliphatic isocyanate compound (such as hexamethylene diisocyanate), and an alicyclic isocyanate compound (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.) Etc. can be mentioned. 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, a solvent, a crosslinking catalyst, a tackifying resin (adhesive agent), a plasticizer, a weather 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 make a harder adhesive layer by mix | blending ultraviolet curable compounds, such as polyfunctional acrylate, with an adhesive composition, and forming an adhesion layer, and irradiating and hardening an ultraviolet-ray, 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)

The adhesive cured layer refers to a layer formed by curing the curable component in the adhesive composition. As an adhesive composition for forming an adhesive hardening layer, an adhesive other than a pressure-sensitive adhesive (adhesive) is mentioned, for example, 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 ultrahigh 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 light irradiation intensity to the resin composition is less than 10 mW / cm 2, the reaction time becomes too long, and when it exceeds 1,000 mW / cm 2, the adhesive cured layer obtained by heat radiated from the light source and heat generation during 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, 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 at the time of light irradiation (UVA (320-390 nm) or UVB (280-) 320 nm), etc.), and the amount of accumulated (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 side of the 50 micrometer-thick cyclic polyolefin type resin film, the above-mentioned active energy ray curable adhesive agent is coated using a coating machine (bar coater, Daiichi Rika Co., Ltd. product), and thickness 50 is further added to the coating surface. A micrometer cyclic polyolefin resin film is laminated. Subsequently, ultraviolet rays are irradiated with "D bulb" manufactured by Fusion UV Systems, so that the amount of accumulated light becomes 1500 mJ / cm 2 (UVB), and the adhesive composition layer is cured. 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. When 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 in the middle of conveyance. Moreover, when it exceeds 0.20 N / 25mm, since 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 it adheres to the peeled release layer. There is a possibility that a part of the layer may be attached, or undesired peeling (for example, peeling between the adhesive layer and the layer bonded on the opposite side 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. When the disk-shaped polymerizable liquid crystal compound is aligned, the optical axis of the polymerizable liquid crystal compound is present in a direction orthogonal to the disk 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, 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, or 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 a 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. What is necessary is just to apply | coat a liquid crystal layer formation composition on an orientation layer, when the orientation layer mentioned later is formed on a base material 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 applicator method, or a printing method such as a flexo 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, a heating drying method, the 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 composition for liquid crystal layer formation is applied and dried using the one containing the photopolymerization initiator as the composition for liquid crystal layer formation, 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 ray, an ultraviolet-ray, a laser beam, X-ray, (alpha) ray, (beta) ray. And at least one active energy ray selected from the group consisting of γ-rays. Among these, since it is easy to control the progress of a polymerization reaction, and can use what is widely used in the said field as a photopolymerization apparatus, an ultraviolet-ray is preferable, and it is preferable to use a polymeric liquid crystal compound and a photoinitiator so that photopolymerization by an ultraviolet-ray is possible. 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 lubricating agent, 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 take into account the decision. 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 floating may arise between a base material layer, a liquid crystal layer, or an orientation layer in the middle of 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 the other liquid crystal layer, an optical film, etc., or the optical laminated body with an adhesion layer or the adhesion layer In the process of manufacturing a sieve, there exists a possibility that the peeling interface may change during the conveyance of each member.

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, peeling force between a 2nd peeling layer and a 2nd adhesion layer from a viewpoint of a long process <1st peeling force <2nd peeling force 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 in the 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 by the polarization irradiation conditions with respect to the photo-alignment polymer in the photo-alignment 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). The uncured layer of resin is formed, and this layer can be formed by the method of hardening by forming an unevenness | corrugation, etc. by pressing a 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, and the component of the composition for liquid crystal layer formation used in order to form a 1st liquid crystal layer. 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 adhesion 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 circularly 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 is measured MD curl value, and is parallel to TD direction The average value of the measured values of the heights from the reference planes of the two corners on one diagonal line was calculated as the 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 About the polarizing plate with a film, the measured MD curl value and the measured TD curl value were computed.

The value which subtracted the actual MD curl value of the adhesion laminated optical laminated body from the measured MD curl value of the obtained protective film polarizing plate was made into the MD curl value of the optical laminated body with adhesion layer in the case of a protective film. Similarly, the value which subtracted the actual TD curl value of the adhesion laminated optical laminated body from the actual measured TD curl value of the obtained protective film polarizing plate was made into the TD curl value of the optical laminated body with an adhesion layer in the case of 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 curl value and the measured TD curl value of the optical laminated body which peeled off were computed. In addition, when the test piece was put on the reference plane so that the polarizing plate side might become the upper side, when the corner of the test piece floated, this curl was made into the normal and the height of the corner from the reference plane was shown as a positive value. On the other hand, when the test piece was placed on the reference plane so that the polarizing plate 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.

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 by the above procedure, The measured value was averaged by the above procedures, and the measured MD curl value and the measured TD curl value of the polarizing plate which peeled the protective film were computed.

The value which subtracted the actual MD curl value of the optical laminated body which peeled the protective film from the actual MD curl value of the polarizing plate which peeled the protective film was made into the MD curl value of the optical laminated body with an adhesion layer in the absence of a protective film. Similarly, the value which subtracted the actual TD curl value of the optical laminated body which peeled off the protective film from the actual TD curl value of the polarizing plate which peeled off the protective film was converted into the TD curl value of the optical laminated body with an adhesion layer in the case of no protective film. did.

The MD curl value and the TD curl value obtained in the measurement (1) and the measurement (2) of the curl indicate that the reverse curl is suppressed when the value is positive or zero, and when the value is negative, the larger the absolute value is Indicates that a reverse curl is in progress.

[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 some of the obtained solutions was measured, it confirmed that 1.8 million (meth) acrylic acid ester polymers could be 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 amount)):

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]

After immersing a polyvinyl alcohol film (average degree of polymerization of about 2,400, saponification degree of 99.9 mol% or more) having a thickness of 30 μm in pure water at 30 ° C., an aqueous solution having a mass ratio of iodide / potassium iodide / water of 0.02 / 2/100 at 30 ° C. Immersed. Then, it immersed at 56.5 degreeC in the aqueous solution which the mass ratio of potassium iodide / boric acid / water is 12/5/100. Subsequently, after wash | cleaning a film using 8 degreeC pure water, it dried at 90 degreeC and obtained the polarizer by which the iodine adsorption was oriented in the polyvinyl alcohol film. Stretching was performed by wet stretching, mainly during iodine dyeing and boric acid treatment, and the total stretching ratio was 5.7 times. The obtained polarizer was a film in which iodine was adsorbed on the polyvinyl alcohol film and had a thickness of 12 µm.

Subsequently, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name "KL-318" obtained from Kuraray) was dissolved with respect to 100 parts of water on one side of this polarizer, and the polyamide which is a water-soluble epoxy resin in the aqueous solution. Epoxy adhesive with 1.5 parts of epoxy-based additives (trade name "Sumirez resin 650 (30)" obtained from Taokakagaku Kogyo Co., Ltd., an aqueous solution having a solid content concentration of 30%) is coated, and a thickness of 30 µm is used as a protective layer. The stretched transparent norbornene-based resin film was bonded to each other so that the angle of the slow axis was 45 ° with respect to the absorption axis of the polarizer. Surface treatment was given to one surface of this film, and it bonded together so that the other surface might be a bonding surface with a polarizer. On the other side of the polarizer, a triacetyl cellulose resin film having a thickness of 20 µm was bonded as the protective layer using the epoxy adhesive described above. Thus, the polarizing plate in which the protective layer was laminated | stacked on both surfaces of the polarizer was obtained. Furthermore, the protective film in which the 15 micrometers acryl-type adhesive layer was formed on the 38-micrometer-thick polyethylene terephthalate (PET) film on the surface-treated surface side of a norbornene-type resin film was bonded, and the polarizing plate with a 115-micrometer-thick protective film (1 ) The measured MD curl value of this protective film polarizing plate was 0 mm, and the measured TD curl value was 18 mm. In addition, the measured MD curl value of the polarizing plate which peeled the protective film was 20 mm, and the measured TD curl value was -2 mm.

[Preparation of the protective film polarizing plate 2]

A 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 further immersed in pure water at 60 ° C. for 1 minute while maintaining a tension state. Then, it was immersed at 28 degreeC for 60 second in the aqueous solution whose mass ratio of iodide / 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.

Subsequently, 3 parts of carboxyl group-modified polyvinyl alcohol (trade name "KL-318" obtained from Kuraray) was dissolved with respect to 100 parts of water on one side of this polarizer, and the polyamide which is a water-soluble epoxy resin in the aqueous solution. Epoxy adhesive with 1.5 parts of epoxy-based additives (trade name "Sumirez resin 650 (30)" obtained from Taokakagaku Kogyo Co., Ltd., solid content concentration 30%) added is coated, and 13 µm thick as a protective layer. Transparent norbornene-based resin film was bonded. Thus, the polarizing plate in which the protective layer was laminated | stacked on the single side | surface of the polarizer was obtained. Furthermore, the protective film in which the 15-micrometer-thick acryl-type adhesion layer was formed on the 38-micrometer-thick polyethylene terephthalate (PET) film was bonded to the surface on the opposite side to the polarizer of a norbornene-type resin film, and a 73-micrometer-thick protective film The equipped polarizing plate 2 was obtained. The measured MD curl value of this polarizing plate with a protect film was -20 mm, and the measured TD curl 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. The light-alignment layer was obtained by performing polarized-light UV exposure by the integrated light quantity of 100 mJ / cm <2> using this. It was 100 nm when the thickness of the obtained photo-alignment layer was measured by the laser microscope (LEXT, Olympus Co., Ltd. make).

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. The thickness of the first liquid crystal layer was 2 μm.

(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 a 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 in FIGS. 1-5 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 700 mm, 1 Pass) on the surface of the second liquid crystal layer side of the second liquid crystal layer (300 mm in length in the MD direction × 200 mm in the TD direction) with the base layer prepared above. ). 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. (See FIG. 1 (c)). Subsequently, a corona treatment is performed on the first liquid crystal layer side of the first liquid crystal layer (300 mm in length in MD direction × 200 mm in length in the TD direction) prepared above as described above, and the corona treatment surface and the substrate After bonding the adhesive composition layer formed on the 2nd liquid crystal layer with a layer using the bonding apparatus ("LPA3301" by Fuji Plastics Co., Ltd.) (refer FIG. 1 (d)), the 2nd liquid crystal with base material layer From the layer side, by the ultraviolet irradiation device equipped with the belt conveyor (the lamp uses "H bulb" manufactured by Fusion UV Systems Co., Ltd.), in the UVA region, the irradiation intensity is 390 mW / cm 2 and the accumulated light amount is 420 mJ / cm 2, In the UVB region, a liquid crystal layer laminate having a base layer was obtained by irradiating ultraviolet rays to cure the adhesive composition so that the amount of accumulated light was 400 mW / cm 2 and the amount of accumulated light was 400 mJ / cm 2 (see FIG. 2 (a)). Moreover, it was about 3000 Mpa when the storage elastic modulus at room temperature of the adhesive bond layer which hardened the said adhesive composition layer was computed by said calculation method.

Corona treatment (800 W, 10 m) on the surface on the opposite side (triacetyl cellulose-based resin film side) from the protective film side of the protective film polarizing plate 1 (MD direction length 300 mm X TD direction length 200 mm) prepared above / min, bar width 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 sheet | leaf bonding with the exposed adhesion layer was performed, and the adhesion layer with polarizing plate was obtained (FIG. 3). (b)).

The 1st separator is peeled from the surface (surface by the side of a 1st liquid crystal layer) exposed by peeling the PET film (100 micrometers in thickness) of the 1st liquid crystal layer of the base material layer with a base material layer liquid crystal layer laminated body, and the polarizing plate with an adhesion layer. And the exposed adhesion layer was sheet-bonded using the automatic bonding machine HALTEC, and the optical laminated body with a base material layer was obtained (refer FIG. 4 (a)). The surface (surface by 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 the base material layer of the obtained base material layer equipped optical laminated body, and the adhesion layer with double-sided separator prepared above The optical laminated body 1 with an adhesion layer was obtained by bonding the adhesion layer which peeled the 2nd separator from mm * 200 mm), and single-layer bonding using the automatic bonding machine HALTEC (refer FIG. 5 (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 optical laminated body 2 with an adhesion layer was obtained like Example 1 except having used the protective film polarizing plate 2 prepared above instead of the protective film polarizing plate 1 (refer FIG. 5 (b)). . Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 2 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 2 with adhesion layer were computed. The results are shown in Table 1.

EXAMPLE 3

The liquid crystal layer laminated body with a base material layer was obtained by the procedure similar to Example 1 (refer FIG. 2 (a)). The surface (surface on the side of a 1st liquid crystal layer) which peeled and exposed the PET film (100 micrometers in thickness) of the 1st liquid crystal layer of the base material layer with a base material layer liquid crystal layer laminated body, and the adhesion layer with double-sided separator prepared above The adhesive layer exposed by peeling a 2nd separator from mm * 200 mm) was bonded by the leaf | leaf bonding using the automatic bonding machine HALTEC, and the liquid-crystal layer laminated body with an adhesion layer was obtained. A side opposite to the protective film side of the adhesive layer exposed by peeling a 1st separator from the liquid-crystal layer laminated body with an adhesion layer, and the above-mentioned protective film polarizing plate 1 (300 mm x 200 mm) prepared above (triacetylcellulose-based resin) The film side) was sheet-bonded using the automatic bonding machine HALTEC, and the optical laminated body with base material layer was obtained.

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 of the base material layer with an optical laminated body with base material layers, and the adhesion layer with a double-sided separator prepared above (300 mm) The adhesive laminated layer which peeled the 2nd separator from * 200mm) and was exposed by single-layer bonding using the automatic bonding machine HALTEC was obtained, 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.

[Comparative Example 1]

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, an optical laminated body was obtained by the process shown in FIG. 7 and FIG. 8, and this optical laminated body is used The obtained optical laminated body with an adhesion layer was obtained. Specifically, the polarizing plate with an adhesion layer was obtained by the same procedure as Example 1 using the protective film polarizing plate 1 with an adhesive prepared above, and the adhesion layer with a double-sided separator. The adhesive layer which peeled and exposed the 1st separator from this polarizing plate with an adhesion layer, and the 1st liquid crystal layer of the 1st liquid crystal layer with base material layer prepared above (MD direction length 300mm X TD direction length 200mm) are automatic bonding machines. Single leaf conjugation was carried out using HALTEC (see FIG. 7 (c)).

Next, 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 1 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 automatic bonding machine HALTEC, the 1st separator was peeled further (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 by this (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 optical laminated body 4 with an adhesion layer was obtained by bonding the adhesive layer exposed by peeling a 2nd separator from mm * 200 mm) by single sheet bonding using the automatic bonding machine HALTEC. Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 4 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 4 with adhesion layer were computed. The results are shown in Table 1.

[Comparative Example 2]

Instead of using the protective film polarizing plate 1, the optical laminated body 5 with an adhesion layer was obtained like the comparative example 1 except having used the protective film with polarizing plate 2 prepared above. Measurement (1) and measurement (2) of curl were performed about the obtained optical laminated body 5 with an adhesion layer, and MD curl value and TD curl value of the optical laminated body 5 with adhesion layer were computed. The results are shown in Table 1.

As shown in Table 1, in the optical laminated body with adhesion layers obtained in Examples 1-3, the reverse curl is suppressed compared with the optical laminated body with adhesion layers obtained in Comparative Examples 1 and 2, and the optical demonstrated in the said embodiment According to the manufacturing method of a laminated body, and the manufacturing method of the optical laminated body with an adhesion layer, it turns out that reverse curl can be suppressed.

10, 10p: first liquid crystal layer with base layer
11, 11p: first base layer
12, 12p: first liquid crystal layer
20, 20p: second liquid crystal layer with base layer
21, 21p: second base layer
22, 22p: second liquid crystal layer
25: second liquid crystal layer with composition layer
31, 31p: first adhesive layer
32: adhesive curing layer
32a: adhesive composition layer
32p: a second 'adhesive layer,
33: second adhesive layer
40: liquid crystal layer laminate with base layer
41, 43: liquid crystal layer laminate
45: liquid crystal layer laminate with a second adhesive layer
50: first adhesive layer with adhesive layer
51: first release layer
52p: second 'peeling layer
53: second release layer
58: second adhesive layer with release layer
60, 60p: optical film
61: optical film with adhesive layer
70, 70p: optical stack
71, 71p: Optical laminated body with base material layer (optical laminated body)
80, 81: Optical laminated body with an adhesion layer.

Claims (14)

As a manufacturing method of the optical laminated body in which an optical film, a 1st adhesion layer, a 1st liquid crystal layer, an adhesive bond hardening layer, and a 2nd liquid crystal layer were laminated | stacked in this order,
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;
Obtaining a base material layer liquid crystal layer laminated body by laminating | stacking the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer with a base material layer so that a said 1st liquid crystal layer and a said 2nd liquid crystal layer may face through the said adhesive hardened layer. and,
Peeling at least said 1st base material layer from the said liquid crystal layer laminated body with base material layers, and obtaining a liquid crystal layer laminated body,
And a step of laminating the optical film on the first exposed surface side of the liquid crystal layer laminate exposed by peeling the first base layer through the first adhesive layer. The process of claim 1, wherein the step of laminating the optical film,
Forming a first adhesive layer on the optical film to obtain an optical film with an adhesive layer;
The manufacturing method of the optical laminated body which includes the process of bonding the said 1st adhesion layer of the said optical film with an adhesion layer, and the said 1st exposure surface of the said liquid crystal layer laminated body. The process of Claim 2 which obtains the said optical film 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 optical film, the manufacturing method of the optical laminated body which includes the process of peeling a said 1st peeling layer. The process of claim 1, wherein the step of laminating the optical film,
Forming a first adhesive layer on the first exposed surface of the liquid crystal layer laminate to obtain a liquid crystal layer laminate having a first adhesive layer;
The manufacturing method of the optical laminated body which includes the process of bonding the said 1st adhesion layer of the said liquid crystal layer laminated body with a 1st adhesion layer and the said optical film. The process of Claim 4 which obtains the said liquid-crystal layer laminated body with a 1st adhesion layer,
Preparing a first adhesive layer with a release layer in which the first adhesive layer and the first release layer are laminated;
Manufacturing the optical laminated body including the process of peeling the said 1st peeling layer, after bonding the said 1st adhesion layer of the said 1st adhesion layer with a peeling layer and the said 1st exposed surface of the said liquid crystal layer laminated body. Way. The process of any one of Claims 1-5 which obtains the said liquid crystal layer laminated body with a base material layer,
Adhesive composition layer containing adhesive composition for forming the said adhesive hardened layer in at least one of the said 1st liquid crystal layer of the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer of a 2nd liquid crystal layer with a base material layer. Forming a process,
After laminating the first liquid crystal layer with the base layer and the second liquid crystal layer with the base layer so that the first liquid crystal layer and the second liquid crystal layer face each other through the adhesive composition layer, the adhesive composition layer is cured to The manufacturing method of the optical laminated body which includes the process of forming an adhesive bond layer. The manufacturing method of the optical laminated body of any one of Claims 1-6 in which the said optical film contains a polarizing plate. The manufacturing method of the optical laminated body of any one of Claims 1-7 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 process of obtaining the said liquid crystal layer laminated body is peeling the said 1st base material layer from the said liquid crystal layer laminated body with a base material layer, and not peeling the said 2nd base material layer in any one of Claims 1-8. Is fair,
After the process of laminating | stacking the said optical film, the manufacturing method of the optical laminated body further including the process of peeling the said 2nd base material layer. The process of obtaining the said liquid crystal layer laminated body is a liquid crystal layer laminated | stacked by peeling the said 1st base material layer and the said 2nd base material layer from the said liquid-crystal layer laminated body with a base material layer, The process of any one of Claims 1-8. The manufacturing method of the optical laminated body which is a process of obtaining a sieve. As a manufacturing method of the optical laminated body with an adhesion layer which an optical film, a 1st adhesion layer, a 1st liquid crystal layer, an adhesive bond hardening layer, a 2nd liquid crystal layer, and a 2nd adhesion layer were laminated | stacked in this order,
The process of preparing the optical laminated body manufactured by the manufacturing method of the optical laminated body of Claim 9 or 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 which includes 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. As a manufacturing method of the optical laminated body with an adhesion layer which an optical film, a 1st adhesion layer, a 1st liquid crystal layer, an adhesive bond hardening layer, a 2nd liquid crystal layer, and a 2nd adhesion layer were laminated | stacked in this order,
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;
Obtaining a base material layer liquid crystal layer laminated body by laminating | stacking the said 1st liquid crystal layer with a base material layer, and the said 2nd liquid crystal layer with a base material layer so that a said 1st liquid crystal layer and a said 2nd liquid crystal layer may face through the said adhesive hardened layer. and,
Peeling at least said 2nd base material layer from the said liquid crystal layer laminated body with base material layers, and obtaining a liquid crystal layer laminated body,
A step of laminating the second adhesive layer on the second exposed surface side of the liquid crystal layer laminate exposed by peeling the second substrate layer to obtain a liquid crystal layer laminate having a second adhesive layer;
Peeling the first substrate layer from the liquid crystal layer laminate with the base layer or the liquid crystal layer laminate with the second adhesive layer;
Laminating | stacking the said 1st base material layer, The optical laminated with adhesion layer containing the process of laminating | stacking the said optical film through the said 1st adhesion layer on the side of the 1st exposure surface of the said liquid-crystal layer laminated body with a 2nd adhesion layer was exposed. Method of making sieves. The process of Claim 13 which obtains the said liquid crystal layer laminated body with a 2nd adhesion layer,
Preparing a second adhesive layer with a release layer in which the second adhesive layer and the second release layer are laminated;
After 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 liquid crystal layer laminated body, the process of peeling the said 2nd peeling layer is included. Method of making sieves.

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